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Sample records for acceptable noise levels

  1. Type of Speech Material Affects Acceptable Noise Level Test Outcome

    PubMed Central

    Koch, Xaver; Dingemanse, Gertjan; Goedegebure, André; Janse, Esther

    2016-01-01

    The acceptable noise level (ANL) test, in which individuals indicate what level of noise they are willing to put up with while following speech, has been used to guide hearing aid fitting decisions and has been found to relate to prospective hearing aid use. Unlike objective measures of speech perception ability, ANL outcome is not related to individual hearing loss or age, but rather reflects an individual’s inherent acceptance of competing noise while listening to speech. As such, the measure may predict aspects of hearing aid success. Crucially, however, recent studies have questioned its repeatability (test–retest reliability). The first question for this study was whether the inconsistent results regarding the repeatability of the ANL test may be due to differences in speech material types used in previous studies. Second, it is unclear whether meaningfulness and semantic coherence of the speech modify ANL outcome. To investigate these questions, we compared ANLs obtained with three types of materials: the International Speech Test Signal (ISTS), which is non-meaningful and semantically non-coherent by definition, passages consisting of concatenated meaningful standard audiology sentences, and longer fragments taken from conversational speech. We included conversational speech as this type of speech material is most representative of everyday listening. Additionally, we investigated whether ANL outcomes, obtained with these three different speech materials, were associated with self-reported limitations due to hearing problems and listening effort in everyday life, as assessed by a questionnaire. ANL data were collected for 57 relatively good-hearing adult participants with an age range representative for hearing aid users. Results showed that meaningfulness, but not semantic coherence of the speech material affected ANL. Less noise was accepted for the non-meaningful ISTS signal than for the meaningful speech materials. ANL repeatability was comparable

  2. Measurement of Acceptable Noise Level with Background Music

    PubMed Central

    Ahn, Hyun-Jung; Bahng, Junghwa

    2015-01-01

    Background and Objectives Acceptable noise level (ANL) is a measure of the maximum background noise level (BNL) that a person is willing to tolerate while following a target story. Although researchers have used various sources of target sound in ANL measures, a limited type of background noise has been used. Extending the previous study of Gordon-Hickey & Moore (2007), the current study determined the effect of music genre and tempo on ANLs as possible factors affecting ANLs. We also investigated the relationships between individual ANLs and the familiarity of music samples and between music ANLs and subjective preference. Subjects and Methods Forty-one participants were seperated into two groups according to their ANLs, 29 low-ANL listeners and 12 high-ANL listeners. Using Korean ANL material, the individual ANLs were measured based on the listeners' most comfortable listening level and BNL. The ANLs were measured in six conditions, with different music tempo (fast, slow) and genre (K-pop, pop, classical) in a counterbalanced order. Results Overall, ANLs did not differ by the tempo of background music, but music genre significantly affected individual ANLs. We observed relatively higher ANLs with K-pop music and relatively lower ANLs with classical music. This tendency was similar in both low-ANL and high-ANL groups. However, the subjective ratings of music familiarity and preference affected ANLs differently for low-ANL and high-ANL groups. In contrast to the low-ANL listeners, the ANLs of the high-ANL listeners were significantly affected by music familiarity and preference. Conclusions The genre of background music affected ANLs obtained using background music. The degree of music familiarity and preference appears to be associated with individual susceptibility to background music only for listeners who are greatly annoyed by background noise (high-ANL listeners). PMID:26413573

  3. Are the noise levels acceptable in a built environment like Hong Kong?

    PubMed

    To, Wai Ming; Mak, Cheuk Ming; Chung, Wai Leung

    2015-01-01

    Governments all over the world have enacted environmental noise directives and noise control ordinances/acts to protect tranquility in residential areas. However, there is a lack of literature on the evaluation of whether the Acceptable Noise Levels (ANLs) stipulated in the directive/ordinance/act are actually achievable. The study aimed at measuring outdoor environmental noise levels in Hong Kong and identifying whether the measured noise levels are lower than the stipulated ANLs at 20 categories of residential areas. Data were gathered from a territory-wide noise survey. Outdoor noise measurements were conducted at 203 residential premises in urban areas, low-density residential areas, rural areas, and other areas. In total, 366 daytime hourly Leq outdoor noise levels, 362 nighttime hourly Leq outdoor noise levels, and 20 sets of daily, that is, 24 L(eq,1-)h outdoor noise levels were recorded. The mean daytime L(eq,1-h) values ranged 54.4-70.8 dBA, while the mean nighttime L(eq,1-h) values ranged 52.6-67.9 dBA. When the measured noise levels were compared with the stipulated ANLs, only three out of the 20 categories of areas had outdoor noise levels below ANLs during daytime. All other areas (and all areas during nighttime) were found to have outdoor noise levels at or above ANLs.

  4. Are the noise levels acceptable in a built environment like Hong Kong?

    PubMed Central

    To, Wai Ming; Mak, Cheuk Ming; Chung, Wai Leung

    2015-01-01

    Governments all over the world have enacted environmental noise directives and noise control ordinances/acts to protect tranquility in residential areas. However, there is a lack of literature on the evaluation of whether the Acceptable Noise Levels (ANLs) stipulated in the directive/ordinance/act are actually achievable. The study aimed at measuring outdoor environmental noise levels in Hong Kong and identifying whether the measured noise levels are lower than the stipulated ANLs at 20 categories of residential areas. Data were gathered from a territory-wide noise survey. Outdoor noise measurements were conducted at 203 residential premises in urban areas, low-density residential areas, rural areas, and other areas. In total, 366 daytime hourly Leq outdoor noise levels, 362 nighttime hourly Leq outdoor noise levels, and 20 sets of daily, that is, 24 Leq,1-h outdoor noise levels were recorded. The mean daytime Leq,1-h values ranged 54.4-70.8 dBA, while the mean nighttime Leq,1-h values ranged 52.6-67.9 dBA. When the measured noise levels were compared with the stipulated ANLs, only three out of the 20 categories of areas had outdoor noise levels below ANLs during daytime. All other areas (and all areas during nighttime) were found to have outdoor noise levels at or above ANLs. PMID:26572703

  5. Comparing Loudness Tolerance and Acceptable Noise Level in Listeners With Hearing Loss.

    PubMed

    Franklin, Clifford A; White, Letitia J; Franklin, Thomas C; Livengood, Lindsay G

    2016-08-01

    The present study was a follow-up investigation to a previous study exploring the relationship between listeners' loudness tolerance and listeners' acceptable noise level among normally hearing adults. The present study compared the same two measures, but data were obtained from listeners with hearing loss; 12 adults with sensorineural hearing loss participated in a loudness tolerance measure using a scaling technique initially established for setting hearing aid output limits, in addition to an acceptable noise level measure. The acceptable noise level procedure used in this study quantified the listeners' acceptance of background noise while listening to speech. As with the research involving listeners with normal hearing, the Pearson correlation procedure indicated a lack of any statistically significant correlation between the two measures.

  6. Influence of music and music preference on acceptable noise levels in listeners with normal hearing.

    PubMed

    Gordon-Hickey, Susan; Moore, Robert E

    2007-05-01

    Acceptable noise level (ANL) is defined as the maximum level of background noise that an individual is willing to accept while listening to speech. The type of background noise does not affect ANL results with the possible exception of music. The purpose of this study was to determine if ANL for music was different from ANL for twelve-talker babble and investigate if there was a correlation between ANL for music samples and preference for those music samples. Results demonstrated that ANL for music tended to be better than ANL for twelve-talker babble, indicating listeners were more willing to accept music as a background noise than speech babble. The results further demonstrated that ANL for the music samples were not correlated with preference for the music samples, indicating that ANL for music was not related to music preference. Therefore, music appeared to be processed differently as a background noise than twelve-talker babble.

  7. The Relationship between Personality Type and Acceptable Noise Levels: A Pilot Study.

    PubMed

    Franklin, Cliff; Johnson, Laura V; White, Letitia; Franklin, Clay; Smith-Olinde, Laura

    2013-01-01

    Objectives. This study examined the relationship between acceptable noise level (ANL) and personality. ANL is the difference between a person's most comfortable level for speech and the loudest level of background noise they are willing to accept while listening to speech. Design. Forty young adults with normal hearing participated. ANLs were measured and two personality tests (Big Five Inventory, Myers-Briggs Type Indicator) were administered. Results. The analysis revealed a correlation between ANL and the openness and conscientious personality dimensions from the Big Five Inventory; no correlation emerged between ANL and the Myers-Briggs personality types. Conclusions. Lower ANLs are correlated with full-time hearing aid use and the openness personality dimension; higher ANLs are correlated with part-time or hearing aid nonuse and the conscientious personality dimension. Current data suggest that those more open to new experiences may accept more noise and possibly be good hearing aid candidates, while those more conscientious may accept less noise and reject hearing aids, based on their unwillingness to accept background noise. Knowing something about a person's personality type may help audiologists determine if their patients will likely be good candidates for hearing aids.

  8. The Relationship between Personality Type and Acceptable Noise Levels: A Pilot Study

    PubMed Central

    Franklin, Cliff; Johnson, Laura V.; Franklin, Clay

    2013-01-01

    Objectives. This study examined the relationship between acceptable noise level (ANL) and personality. ANL is the difference between a person's most comfortable level for speech and the loudest level of background noise they are willing to accept while listening to speech. Design. Forty young adults with normal hearing participated. ANLs were measured and two personality tests (Big Five Inventory, Myers-Briggs Type Indicator) were administered. Results. The analysis revealed a correlation between ANL and the openness and conscientious personality dimensions from the Big Five Inventory; no correlation emerged between ANL and the Myers-Briggs personality types. Conclusions. Lower ANLs are correlated with full-time hearing aid use and the openness personality dimension; higher ANLs are correlated with part-time or hearing aid nonuse and the conscientious personality dimension. Current data suggest that those more open to new experiences may accept more noise and possibly be good hearing aid candidates, while those more conscientious may accept less noise and reject hearing aids, based on their unwillingness to accept background noise. Knowing something about a person's personality type may help audiologists determine if their patients will likely be good candidates for hearing aids. PMID:24349796

  9. Acceptance Noise Level: Effects of the Speech Signal, Babble, and Listener Language

    ERIC Educational Resources Information Center

    Shi, Lu-Feng; Azcona, Gabrielly; Buten, Lupe

    2015-01-01

    Purpose: The acceptable noise level (ANL) measure has gained much research/clinical interest in recent years. The present study examined how the characteristics of the speech signal and the babble used in the measure may affect the ANL in listeners with different native languages. Method: Fifteen English monolingual, 16 Russian-English bilingual,…

  10. Criteria for acceptable levels of the Shinkansen Super Express train noise and vibration in residential areas

    NASA Astrophysics Data System (ADS)

    Yamanaka, K.; Nakagawa, T.; Kobayashi, F.; Kanada, S.; Tanahashi, M.; Muramatsu, T.; Yamada, S.

    1982-10-01

    A survey of 1187 housewives living in 18 areas along the Shinkansen Super Express (bullet train) railway was conducted by means of a self-administered health questionnaire (modified Cornell Medical Index). In addition, geographically corresponding measurements of noise level and vibration intensity were taken. The relationship of noise and vibration to positive responses (health complaints) related to bodily symptoms, illness and emotional disturbances was analyzed. The factors which correlated with an increase in the average number of positive responses included noise, vibration, age and health status. Such factors as marital status, educational level, part time work, duration of inhabitancy and occupation of the head of the houshold correlated poorly with the number of positive responses. Unhealthy respondents compared to healthy respondents are more frequently affected by noise and vibration. The rate of positive responses in the visual, respiratory, cardiovascular, digestive and nervous systems, sleep disturbances and emotional disturbances increased accordingly as noise and vibration increased. Combined effects of noise and vibration stimuli on the total number of positive responses (an indicator of general health) were found. This study has produced results indicating that the maximum permissible noise level should not exceed 70 dB(A) in the residential areas along the Shinkansen railway.

  11. Physiologic correlates to background noise acceptance

    NASA Astrophysics Data System (ADS)

    Tampas, Joanna; Harkrider, Ashley; Nabelek, Anna

    2001-05-01

    Acceptance of background noise can be evaluated by having listeners indicate the highest background noise level (BNL) they are willing to accept while following the words of a story presented at their most comfortable listening level (MCL). The difference between the selected MCL and BNL is termed the acceptable noise level (ANL). One of the consistent findings in previous studies of ANL is large intersubject variability in acceptance of background noise. This variability is not related to age, gender, hearing sensitivity, personality, type of background noise, or speech perception in noise performance. The purpose of the current experiment was to determine if individual differences in physiological activity measured from the peripheral and central auditory systems of young female adults with normal hearing can account for the variability observed in ANL. Correlations between ANL and various physiological responses, including spontaneous, click-evoked, and distortion-product otoacoustic emissions, auditory brainstem and middle latency evoked potentials, and electroencephalography will be presented. Results may increase understanding of the regions of the auditory system that contribute to individual noise acceptance.

  12. The relationship between hearing aid frequency response and acceptable noise level in patients with sensorineural hearing loss

    PubMed Central

    Jalilvand, Hamid; Pourbakht, Akram; Jalaee, Shohreh

    2015-01-01

    Background: When fitting hearing aid as a compensatory device for an impaired cochlea in a patient with sensorineural hearing loss (HL), it is needed to the effective and efficient frequency response would be selected regarding providing the patient's perfect speech perception. There is not any research about the effects of frequency modifications on speech perception in patients with HL regarding the cochlear desensitization. The effect (s) of modifications in frequency response of hearing aid amplification on the results of acceptable noise level (ANL) test is the main aim of this study. Materials and Methods: The amounts of ANL in two conditions of linear amplification (high frequency emphasis [HFE] and mid frequency emphasis [MFE]) were measured. Thirty-two male subjects who participated in this study had the moderate to severe sensorineural HL. Results: There was not any significant difference between ANL in linear amplification of hearing aid with HFE frequency response and ANL in linear amplification of hearing aid with MFE frequency response. Conclusion: The gain modification of frequency response not only does not affect the patient's performance of speech intelligibility in ANL test. This indicates that we need to note to the cochlear desensitization phenomenon when fitting hearing aid as a compensatory device for an impaired cochlea in a patient. The cochlear desensitization has not been considered properly in hearing aid fitting formula which is needed to be explored more about the bio-mechanisms of impaired cochlea. PMID:26918238

  13. Relationship between loudness tolerance and the acceptance of background noise for young adults with normal hearing.

    PubMed

    Franklin, Clifford A; White, Letitia J; Franklin, Thomas C

    2012-06-01

    This study investigated the relationship between listener loudness tolerance and listener acceptable noise level (ANL). Twenty-five normal hearing adults completed loudness tolerance and acceptable noise level measures. Loudness tolerance was measured using a scaling technique. The acceptable noise levels were calculated from a procedure designed to quantify a listener's willingness to accept background noise while listening to speech. Pearson correlation confirmed that loudness tolerance and acceptable noise levels are not related.

  14. A study of the effect of flight density and background noise on V/STOL acceptability. [effective perceived noise level as measure of annoyance

    NASA Technical Reports Server (NTRS)

    Sternfeld, H., Jr.; Hinterkeuser, E. G.; Hackman, R. B.; Davis, J.

    1974-01-01

    A study was conducted in which test subjects evaluated the sounds of a helicopter, a turbofan STOL and a turbojet airplane while engaged in work and leisure activities. Exposure to a high repetitive density of the aircraft sounds did not make the individual sounds more annoying but did create an unacceptable environment. The application of a time duration term to db(A) resulted in a measure which compared favorably with EPNL as a predictor of annoyance. Temporal variations in background noise level had no significant effect on the rated annoyance.

  15. The Acceptance of Background Noise in Adult Cochlear Implant Users

    ERIC Educational Resources Information Center

    Plyler, Patrick N.; Bahng, Junghwa; von Hapsburg, Deborah

    2008-01-01

    Purpose: The purpose of this study was to determine (a) if acceptable noise levels (ANLs) are different in cochlear implant (CI) users than in listeners with normal hearing, (b) if ANLs are related to sentence reception thresholds in noise in CI users, and (c) if ANLs and subjective outcome measures are related in CI users. Method: ANLs and the…

  16. Establishment of noise acceptance criteria for wind turbines

    NASA Technical Reports Server (NTRS)

    Stephens, D. G.; Shepherd, K. P.; Grosveld, F.

    1981-01-01

    A program is being conducted to develop noise criteria for wind turbines which minimize annoyance and which can be used in design specifications for future machines. The approach consists of presenting wind turbine noise stimuli to test subjects in a laboratory listening chamber. The responses of the subjects are recorded for a range of stimuli which encompass the designs, operating conditions, and ambient noise levels of current and future installations. Results to date have established the threshold of detectability for a range of impulsive stimuli of the type associated with blade/tower-wake interactions. The status of the ongoing psychoacoustic tests, the subjective data, and the approach to the development of noise acceptance criteria are described.

  17. 75 FR 44046 - Noise Exposure Map Acceptance

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-27

    ... the precise relationship of specific properties to noise exposure contours depicted on a noise... contours, or in interpreting the noise exposure maps to resolve questions concerning, for example, which.... Therefore, the responsibility for the detailed overlaying of noise exposure contours onto the map...

  18. Community acceptance of helicopter noise: Criteria and application

    NASA Technical Reports Server (NTRS)

    Munch, C. L.; King, R. J.

    1974-01-01

    A study was conducted to define those criteria necessary for civil helicopter operations to be acoustically acceptable to the communities from which they operate and over which they fly. The study involved surveying existing domestic and foreign Federal regulations and guidelines, state and local noise ordinances, results of community noise annoyance studies, and results of individual aircraft noise annoyance studies, and results of individual aircraft noise annoyance studies in order to establish the criteria. The final criteria selection are based on the Day-Night Level, L sub DN, a measure of total noise exposure. The basic rating unit is the A weighted sound pressure level (dbA) which has accuracy comparable to other units currently used for aircraft. An L sub DN of 60 is recommended as a criterion for areas where the ambient noise is below 58 dbA. An L sub DN value 2 dbA above the local ambient is recommended for areas where the ambient is above 58 dbA.

  19. Acceptance and control of aircraft interior noise and vibration

    NASA Technical Reports Server (NTRS)

    Stephens, D. G.; Leatherwood, J. D.

    1980-01-01

    Ride quality criteria for noise, vibration, and their combination in the helicopter cabin environment are discussed. Results are presented of laboratory and field studies of passenger responses to interior noise and vibration during the performance of a listening task and during reverie, as well as to the interaction of noise with multi-frequency and multi-axis vibration. A study of means for reducing helicopter interior noise based on analytical, experimental and flight studies of the near-field noise source characteristics of the aircraft, the transmission of noise through aircraft structures and the attenuation of noise by various noise control treatments is then presented which has resulted in a reduction of 3 dB in helicopter cabin noise. Finally, a model under development to evaluate passenger acceptance of a helicopter noise and vibration environment is indicated which incorporates the observed noise and vibration effects on comfort and is expected to provide insights for more effective noise and vibration control.

  20. High level white noise generator

    DOEpatents

    Borkowski, Casimer J.; Blalock, Theron V.

    1979-01-01

    A wide band, stable, random noise source with a high and well-defined output power spectral density is provided which may be used for accurate calibration of Johnson Noise Power Thermometers (JNPT) and other applications requiring a stable, wide band, well-defined noise power spectral density. The noise source is based on the fact that the open-circuit thermal noise voltage of a feedback resistor, connecting the output to the input of a special inverting amplifier, is available at the amplifier output from an equivalent low output impedance caused by the feedback mechanism. The noise power spectral density level at the noise source output is equivalent to the density of the open-circuit thermal noise or a 100 ohm resistor at a temperature of approximately 64,000 Kelvins. The noise source has an output power spectral density that is flat to within 0.1% (0.0043 db) in the frequency range of from 1 KHz to 100 KHz which brackets typical passbands of the signal-processing channels of JNPT's. Two embodiments, one of higher accuracy that is suitable for use as a standards instrument and another that is particularly adapted for ambient temperature operation, are illustrated in this application.

  1. Noise Hazard Evaluation Sound Level Data on Noise Sources

    DTIC Science & Technology

    1975-01-01

    AD-A021 465 NOISE HAZARD EfALUATION SOUND LEVEL DATA ON NOISE SOURCES Jeffrey Goldstein Army Environmental Hygiene Agency Prepared for: Army Health ...A. Noise Hazard Evaluation. B. Engineering Noise Control. C. Health Education. D. Audiometry. E. Hearing Protection. This technical guide concerns the...SOUND LEVEL DATA OF NOISE SOURCES Approved for public release, distribution unlimited. jGI4A C4C SENTINEL HEALTH I 5 US ARMY ENVIROIN.MENTAL HYGIENE

  2. Computer program to predict aircraft noise levels

    NASA Technical Reports Server (NTRS)

    Clark, B. J.

    1981-01-01

    Methods developed at the NASA Lewis Research Center for predicting the noise contributions from various aircraft noise sources were programmed to predict aircraft noise levels either in flight or in ground tests. The noise sources include fan inlet and exhaust, jet, flap (for powered lift), core (combustor), turbine, and airframe. Noise propagation corrections are available for atmospheric attenuation, ground reflections, extra ground attenuation, and shielding. Outputs can include spectra, overall sound pressure level, perceived noise level, tone-weighted perceived noise level, and effective perceived noise level at locations specified by the user. Footprint contour coordinates and approximate footprint areas can also be calculated. Inputs and outputs can be in either System International or U.S. customary units. The subroutines for each noise source and propagation correction are described. A complete listing is given.

  3. Annoyance and acceptability judgements of noise produced by three types of aircraft by residents living near JFK Airport

    NASA Technical Reports Server (NTRS)

    Borsky, P. N.

    1974-01-01

    A random sample of selected communities near JFK Airport were interviewed. Subsamples, with differing feelings of fear of aircraft crashes and different locations of residence were invited to participate in a laboratory experiment. The subjects were exposed to tape recordings of simulated flyovers of aircraft in approach and departure operations at nominal distances from the airport. The subjects judged the extent of noise annoyance and acceptability of the aircraft noises. Results indicate that level of noise is most significant in affecting annoyance judgements. Subjects with feelings of high fear report significantly more annoyance and less acceptability of aircraft noise than subjects with feelings of low fear.

  4. Noise Levels in the Operating Room

    DTIC Science & Technology

    2001-10-01

    59-63. Hodge, B., & Thompson , J . F . (1990). Noise pollution in the operating theatre. The Lancet, 335, 891-894. Noise Levels 41...Kam, P. C. A., Kam A. C., & Thompson , J . F . (1994). Noise pollution in the anaesthetic and intensive care environment. Anaesthesia, 49, 982-986

  5. Noise in restaurants: levels and mathematical model.

    PubMed

    To, Wai Ming; Chung, Andy

    2014-01-01

    Noise affects the dining atmosphere and is an occupational hazard to restaurant service employees worldwide. This paper examines the levels of noise in dining areas during peak hours in different types of restaurants in Hong Kong SAR, China. A mathematical model that describes the noise level in a restaurant is presented. The 1-h equivalent continuous noise level (L(eq,1-h)) was measured using a Type-1 precision integral sound level meter while the occupancy density, the floor area of the dining area, and the ceiling height of each of the surveyed restaurants were recorded. It was found that the measured noise levels using Leq,1-h ranged from 67.6 to 79.3 dBA in Chinese restaurants, from 69.1 to 79.1 dBA in fast food restaurants, and from 66.7 to 82.6 dBA in Western restaurants. Results of the analysis of variance show that there were no significant differences between means of the measured noise levels among different types of restaurants. A stepwise multiple regression analysis was employed to determine the relationships between geometrical and operational parameters and the measured noise levels. Results of the regression analysis show that the measured noise levels depended on the levels of occupancy density only. By reconciling the measured noise levels and the mathematical model, it was found that people in restaurants increased their voice levels when the occupancy density increased. Nevertheless, the maximum measured hourly noise level indicated that the noise exposure experienced by restaurant service employees was below the regulated daily noise exposure value level of 85 dBA.

  6. Nuisance levels of noise effects radiologists' performance

    NASA Astrophysics Data System (ADS)

    McEntee, Mark F.; Coffey, Amina; Ryan, John; O'Beirne, Aaron; Toomey, Rachel; Evanoff, Micheal; Manning, David; Brennan, Patrick C.

    2010-02-01

    This study aimed to measure the sound levels in Irish x-ray departments. The study then established whether these levels of noise have an impact on radiologists performance Noise levels were recorded 10 times within each of 14 environments in 4 hospitals, 11 of which were locations where radiologic images are judged. Thirty chest images were then presented to 26 senior radiologists, who were asked to detect up to three nodular lesions within 30 posteroanterior chest x-ray images in the absence and presence of noise at amplitude demonstrated in the clinical environment. The results demonstrated that noise amplitudes rarely exceeded that encountered with normal conversation with the maximum mean value for an image-viewing environment being 56.1 dB. This level of noise had no impact on the ability of radiologists to identify chest lesions with figure of merits of 0.68, 0.69, and 0.68 with noise and 0.65, 0.68, and 0.67 without noise for chest radiologists, non-chest radiologists, and all radiologists, respectively. the difference in their performance using the DBM MRMC method was significantly better with noise than in the absence of noise at the 90% confidence interval (p=0.077). Further studies are required to establish whether other aspects of diagnosis are impaired such as recall and attention and the effects of more unexpected noise on performance.

  7. Practical ranges of loudness levels of various types of environmental noise, including traffic noise, aircraft noise, and industrial noise.

    PubMed

    Salomons, Erik M; Janssen, Sabine A

    2011-06-01

    In environmental noise control one commonly employs the A-weighted sound level as an approximate measure of the effect of noise on people. A measure that is more closely related to direct human perception of noise is the loudness level. At constant A-weighted sound level, the loudness level of a noise signal varies considerably with the shape of the frequency spectrum of the noise signal. In particular the bandwidth of the spectrum has a large effect on the loudness level, due to the effect of critical bands in the human hearing system. The low-frequency content of the spectrum also has an effect on the loudness level. In this note the relation between loudness level and A-weighted sound level is analyzed for various environmental noise spectra, including spectra of traffic noise, aircraft noise, and industrial noise. From loudness levels calculated for these environmental noise spectra, diagrams are constructed that show the relation between loudness level, A-weighted sound level, and shape of the spectrum. The diagrams show that the upper limits of the loudness level for broadband environmental noise spectra are about 20 to 40 phon higher than the lower limits for narrowband spectra, which correspond to the loudness levels of pure tones. The diagrams are useful for assessing limitations and potential improvements of environmental noise control methods and policy based on A-weighted sound levels.

  8. Practical Ranges of Loudness Levels of Various Types of Environmental Noise, Including Traffic Noise, Aircraft Noise, and Industrial Noise

    PubMed Central

    Salomons, Erik M.; Janssen, Sabine A.

    2011-01-01

    In environmental noise control one commonly employs the A-weighted sound level as an approximate measure of the effect of noise on people. A measure that is more closely related to direct human perception of noise is the loudness level. At constant A-weighted sound level, the loudness level of a noise signal varies considerably with the shape of the frequency spectrum of the noise signal. In particular the bandwidth of the spectrum has a large effect on the loudness level, due to the effect of critical bands in the human hearing system. The low-frequency content of the spectrum also has an effect on the loudness level. In this note the relation between loudness level and A-weighted sound level is analyzed for various environmental noise spectra, including spectra of traffic noise, aircraft noise, and industrial noise. From loudness levels calculated for these environmental noise spectra, diagrams are constructed that show the relation between loudness level, A-weighted sound level, and shape of the spectrum. The diagrams show that the upper limits of the loudness level for broadband environmental noise spectra are about 20 to 40 phon higher than the lower limits for narrowband spectra, which correspond to the loudness levels of pure tones. The diagrams are useful for assessing limitations and potential improvements of environmental noise control methods and policy based on A-weighted sound levels. PMID:21776205

  9. Underwater noise levels in UK waters

    NASA Astrophysics Data System (ADS)

    Merchant, Nathan D.; Brookes, Kate L.; Faulkner, Rebecca C.; Bicknell, Anthony W. J.; Godley, Brendan J.; Witt, Matthew J.

    2016-11-01

    Underwater noise from human activities appears to be rising, with ramifications for acoustically sensitive marine organisms and the functioning of marine ecosystems. Policymakers are beginning to address the risk of ecological impact, but are constrained by a lack of data on current and historic noise levels. Here, we present the first nationally coordinated effort to quantify underwater noise levels, in support of UK policy objectives under the EU Marine Strategy Framework Directive (MSFD). Field measurements were made during 2013–2014 at twelve sites around the UK. Median noise levels ranged from 81.5–95.5 dB re 1 μPa for one-third octave bands from 63–500 Hz. Noise exposure varied considerably, with little anthropogenic influence at the Celtic Sea site, to several North Sea sites with persistent vessel noise. Comparison of acoustic metrics found that the RMS level (conventionally used to represent the mean) was highly skewed by outliers, exceeding the 97th percentile at some frequencies. We conclude that environmental indicators of anthropogenic noise should instead use percentiles, to ensure statistical robustness. Power analysis indicated that at least three decades of continuous monitoring would be required to detect trends of similar magnitude to historic rises in noise levels observed in the Northeast Pacific.

  10. Underwater noise levels in UK waters.

    PubMed

    Merchant, Nathan D; Brookes, Kate L; Faulkner, Rebecca C; Bicknell, Anthony W J; Godley, Brendan J; Witt, Matthew J

    2016-11-10

    Underwater noise from human activities appears to be rising, with ramifications for acoustically sensitive marine organisms and the functioning of marine ecosystems. Policymakers are beginning to address the risk of ecological impact, but are constrained by a lack of data on current and historic noise levels. Here, we present the first nationally coordinated effort to quantify underwater noise levels, in support of UK policy objectives under the EU Marine Strategy Framework Directive (MSFD). Field measurements were made during 2013-2014 at twelve sites around the UK. Median noise levels ranged from 81.5-95.5 dB re 1 μPa for one-third octave bands from 63-500 Hz. Noise exposure varied considerably, with little anthropogenic influence at the Celtic Sea site, to several North Sea sites with persistent vessel noise. Comparison of acoustic metrics found that the RMS level (conventionally used to represent the mean) was highly skewed by outliers, exceeding the 97(th) percentile at some frequencies. We conclude that environmental indicators of anthropogenic noise should instead use percentiles, to ensure statistical robustness. Power analysis indicated that at least three decades of continuous monitoring would be required to detect trends of similar magnitude to historic rises in noise levels observed in the Northeast Pacific.

  11. Underwater noise levels in UK waters

    PubMed Central

    Merchant, Nathan D.; Brookes, Kate L.; Faulkner, Rebecca C.; Bicknell, Anthony W. J.; Godley, Brendan J.; Witt, Matthew J.

    2016-01-01

    Underwater noise from human activities appears to be rising, with ramifications for acoustically sensitive marine organisms and the functioning of marine ecosystems. Policymakers are beginning to address the risk of ecological impact, but are constrained by a lack of data on current and historic noise levels. Here, we present the first nationally coordinated effort to quantify underwater noise levels, in support of UK policy objectives under the EU Marine Strategy Framework Directive (MSFD). Field measurements were made during 2013–2014 at twelve sites around the UK. Median noise levels ranged from 81.5–95.5 dB re 1 μPa for one-third octave bands from 63–500 Hz. Noise exposure varied considerably, with little anthropogenic influence at the Celtic Sea site, to several North Sea sites with persistent vessel noise. Comparison of acoustic metrics found that the RMS level (conventionally used to represent the mean) was highly skewed by outliers, exceeding the 97th percentile at some frequencies. We conclude that environmental indicators of anthropogenic noise should instead use percentiles, to ensure statistical robustness. Power analysis indicated that at least three decades of continuous monitoring would be required to detect trends of similar magnitude to historic rises in noise levels observed in the Northeast Pacific. PMID:27830837

  12. Sound-Level Measurements of a Light Airplane Modified to Reduce Noise Reaching the Ground

    NASA Technical Reports Server (NTRS)

    Vogeley, A W

    1949-01-01

    An Army liaison-type airplane, representative of personal airplanes in the 150 to 200 horsepower class, has been modified to reduce propeller and engine noise according to known principles of airplane-noise reduction. Noise-level measurements demonstrate that, with reference to an observer on the ground, a noisy airplane of this class can be made quiet -- perhaps more quiet than necessary. In order to avoid extreme and unnecessary modifications, acceptable noise levels must be determined.

  13. Preferred and Minimum Acceptable Listening Levels for Musicians while Using Floor and In-Ear Monitors

    ERIC Educational Resources Information Center

    Federman, Jeremy; Ricketts, Todd

    2008-01-01

    Purpose: This study examined the impact that changing on-stage music and crowd noise levels during musical performance had on preferred listening levels (PLLs) and minimum acceptable listening levels (MALLs) across both floor and in-ear monitors. Method: Participants for this study were 23- to 48-year-old musicians, with and without hearing loss,…

  14. The Impact of Listening Condition on Background Noise Acceptance for Young Adults with Normal Hearing

    ERIC Educational Resources Information Center

    Gordon-Hickey, Susan; Moore, Robert E.; Estis, Julie M.

    2012-01-01

    Purpose: To evaluate the effect of different speech conditions on background noise acceptance. A total of 23 stimulus pairings, differing in primary talker gender (female, male, conventional), number of background talkers (1, 4, 12), and gender composition of the background noise (female, male, mixed) were used to evaluate background noise…

  15. Background Noise Acceptance and Personality Factors Involved in Library Environment Choices by College Students

    ERIC Educational Resources Information Center

    Gordon-Hickey, Susan; Lemley, Trey

    2012-01-01

    For decades, academic libraries made efforts to provide study environments differing in acoustic environment. The present study aimed to provide an evidence basis for this practice by comparing background noise acceptance and personality factors of two groups of college-aged students self identified as preferring quiet or background noise when…

  16. Combined effect of noise and vibration on passenger acceptance

    NASA Technical Reports Server (NTRS)

    Leatherwood, J. D.

    1984-01-01

    An extensive research program conducted at NASA Langley Research Center to develop a comprehensive model of passenger comfort response to combined noise and vibration environments has been completed. This model was developed for use in the prediction and/or assessment of vehicle ride quality and as a ride quality design tool. The model has the unique capability to transform individual elements of vehicle interior noise and vibration into subjective units and combining the subjective units to produce a total subjective discomfort index as well as the other useful subjective indices. This paper summarizes the basic approach used in the development of the NASA ride comfort model, presents some of the more fundamental results obtained, describes several application of the model to operational vehicles, and discusses a portable, self-contained ride quality meter system that is a direct hardware/software implementation of the NASA comfort algorithm.

  17. Noise levels associated with urban land use.

    PubMed

    King, Gavin; Roland-Mieszkowski, Marek; Jason, Timothy; Rainham, Daniel G

    2012-12-01

    Recent trends towards the intensification of urban development to increase urban densities and avoid sprawl should be accompanied by research into the potential for related health impacts from environmental exposure. The objective of the current study was to examine the effect of the built environment and land use on levels of environmental noise. Two different study areas were selected using a combination of small area census geography, land use information, air photography, and ground-truthing. The first study area represented residential land use and consisted of two- to three-story single-family homes. The second study area was characteristic of mixed-use urban planning with apartment buildings as well as commercial and institutional development. Study areas were subdivided into six grids, and a location was randomly selected within each grid for noise monitoring. Each location was sampled four times over a 24-h day, resulting in a total of 24 samples for each of the two areas. Results showed significant variability in noise within study areas and significantly higher levels of environmental noise in the mixed-use area. Both study areas exceeded recommended noise limits when evaluated against World Health Organization guidelines and yielded average noise events values in the moderate to serious annoyance range with the potential to obscure normal conversation and cause sleep disturbance.

  18. A comparison of a laboratory and field study of annoyance and acceptability of aircraft noise exposures. [human reactions and tolerance

    NASA Technical Reports Server (NTRS)

    Borsky, P. N.

    1977-01-01

    Residents living in close, middle and distant areas from JFK Airport were included in a field interview and laboratory study. Judgments were made of simulated aircraft noise exposures of comparable community indoor noise levels and mixes of aircraft. Each group of subjects judged the levels of noise typical for its distance area. Four different numbers of flyovers were tested: less than average for each area, the approximate average, the peak number, or worst day, and above peak number. The major findings are: (1) the reported integrated field annoyance is best related to the annoyance reported for the simulated approximate worst day exposure in the laboratory; (2) annoyance is generally less when there are fewer aircraft flyovers, and the subject has less fear of crashes and more favorable attitudes toward airplanes; (3) beliefs in harmful health effects and misfeasance by operators of aircraft are also highly correlated with fear and noise annoyance; (4) in direct retrospective comparisons of number of flights, noise levels and annoyance, subjects more often said the worst day laboratory exposured more like their usual home environments; and (5) subjects do not expect an annoyance-free environment. Half of the subjects can accept an annoyance level of 5 to 6 from a possible annoyance range of 0 to 9, 28% can live with an annoyance intensity of 7, and only 5% can accept the top scores of 8 to 9.

  19. Noise measurements on the helicopter BK 117 design. Weighted noise levels and influence of airspeed

    NASA Astrophysics Data System (ADS)

    Splettstoesser, Wolf R.; Anders, Klaus P.; Spiegel, Karl-Heinz

    1986-11-01

    Noise measurements on the prototype helicopter BK 117 were performed in strict compliance with the proposed international Civil Aviation Organization regulations for noise certification of helicopters. Measurement procedure, noise data acquisition, analysis and reduction as well as applied correction procedures are described. Effective perceived noise levels (EPNL) and other noise descriptors were evaluated and related to the proposed noise limits. Additional level flyover tests with variable airspeed were conducted to investigate the resulting effect on the EPNL and other noise measures.

  20. Noise levels in an urban Asian school environment.

    PubMed

    Chan, Karen M K; Li, Chi Mei; Ma, Estella P M; Yiu, Edwin M L; McPherson, Bradley

    2015-01-01

    Background noise is known to adversely affect speech perception and speech recognition. High levels of background noise in school classrooms may affect student learning, especially for those pupils who are learning in a second language. The current study aimed to determine the noise level and teacher speech-to-noise ratio (SNR) in Hong Kong classrooms. Noise level was measured in 146 occupied classrooms in 37 schools, including kindergartens, primary schools, secondary schools and special schools, in Hong Kong. The mean noise levels in occupied kindergarten, primary school, secondary school and special school classrooms all exceeded recommended maximum noise levels, and noise reduction measures were seldom used in classrooms. The measured SNRs were not optimal and could have adverse implications for student learning and teachers' vocal health. Schools in urban Asian environments are advised to consider noise reduction measures in classrooms to better comply with recommended maximum noise levels for classrooms.

  1. Noise levels in an urban Asian school environment

    PubMed Central

    Chan, Karen M.K.; Li, Chi Mei; Ma, Estella P.M.; Yiu, Edwin M.L.; McPherson, Bradley

    2015-01-01

    Background noise is known to adversely affect speech perception and speech recognition. High levels of background noise in school classrooms may affect student learning, especially for those pupils who are learning in a second language. The current study aimed to determine the noise level and teacher speech-to-noise ratio (SNR) in Hong Kong classrooms. Noise level was measured in 146 occupied classrooms in 37 schools, including kindergartens, primary schools, secondary schools and special schools, in Hong Kong. The mean noise levels in occupied kindergarten, primary school, secondary school and special school classrooms all exceeded recommended maximum noise levels, and noise reduction measures were seldom used in classrooms. The measured SNRs were not optimal and could have adverse implications for student learning and teachers’ vocal health. Schools in urban Asian environments are advised to consider noise reduction measures in classrooms to better comply with recommended maximum noise levels for classrooms. PMID:25599758

  2. 49 CFR 325.7 - Allowable noise levels.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 49 Transportation 5 2010-10-01 2010-10-01 false Allowable noise levels. 325.7 Section 325.7... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION GENERAL REGULATIONS COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS General Provisions § 325.7 Allowable noise levels. Motor vehicle noise emissions,...

  3. 49 CFR 325.7 - Allowable noise levels.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 49 Transportation 5 2014-10-01 2014-10-01 false Allowable noise levels. 325.7 Section 325.7... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION GENERAL REGULATIONS COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS General Provisions § 325.7 Allowable noise levels. Motor vehicle noise emissions,...

  4. 49 CFR 325.7 - Allowable noise levels.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 49 Transportation 5 2011-10-01 2011-10-01 false Allowable noise levels. 325.7 Section 325.7... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION GENERAL REGULATIONS COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS General Provisions § 325.7 Allowable noise levels. Motor vehicle noise emissions,...

  5. 49 CFR 325.7 - Allowable noise levels.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 49 Transportation 5 2012-10-01 2012-10-01 false Allowable noise levels. 325.7 Section 325.7... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION GENERAL REGULATIONS COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS General Provisions § 325.7 Allowable noise levels. Motor vehicle noise emissions,...

  6. 49 CFR 325.7 - Allowable noise levels.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 49 Transportation 5 2013-10-01 2013-10-01 false Allowable noise levels. 325.7 Section 325.7... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION GENERAL REGULATIONS COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS General Provisions § 325.7 Allowable noise levels. Motor vehicle noise emissions,...

  7. Are urban noise pollution levels decreasing?

    PubMed

    Arana, M

    2010-04-01

    The majority of acoustic impact studies developed over the last 50 years have used a similar acoustic parameter (L(eq), L(dn)) but the noise mapping methodology has been very uneven. The selection of the measurement points, the measurement periods, or the evaluation indices have not followed a unique criterion. Therefore, it is not possible to compare the sound pollution levels between different cities from those studies, at least in a rigorous sense. Even more, different studies carried out in the same city by different researchers during different years and using different methodologies are not conclusive whether the acoustic pollution increases or decreases. The present paper shows results, with statistical significance, about the evolution of the acoustic pollution obtained for two Spanish cities, Pamplona and Madrid. In both cases, it can be concluded that noise pollution decreases over time (P<0.01).

  8. Research plan for establishing the effects of time varying noise exposures on community annoyance and acceptability

    NASA Technical Reports Server (NTRS)

    Borsky, P. N.

    1980-01-01

    The design of a community noise survey to determine the effects of time varying noise exposures in residential communities is presented. Complex physical and human variables involved in the health and welfare effects of environmental noise and the number-level tradeoffs and time of day penalties are among the factors considered. Emphasis is placed on community reactions where noise exposures are equal in day or evening but differ in the night time, and the effects of ambient noise on more intense aircraft noise exposures. Thirteen different times of day and types of operation situations with exposed populations up to 8-10 miles from the airport are identified. A detailed personal interview questionnaire as well as specific instructions to interviewers are included.

  9. Civil helicopter noise assessment study Boeing-Vertol model 347. [recommendations for reduction of helicopter noise levels

    NASA Technical Reports Server (NTRS)

    Hinterkeuser, E. G.; Sternfeld, H., Jr.

    1974-01-01

    A study was conducted to forecast the noise restrictions which may be imposed on civil transport helicopters in the 1975-1985 time period. Certification and community acceptance criteria were predicted. A 50 passenger tandem rotor helicopter based on the Boeing-Vertol Model 347 was studied to determine the noise reductions required, and the means of achieving them. Some of the important study recommendations are: (1) certification limits should be equivalent to 95 EPNdb at data points located at 500 feet to each side of the touchdown/takeoff point, and 1000 feet from this point directly under the approach and departure flight path. (2) community acceptance should be measured as Equivalent Noise Level (Leq), based on dBA, with separate limits for day and night operations, and (3) in order to comply with the above guidelines, the Model 347 helicopter will require studies and tests leading to several modifications.

  10. 21 CFR 801.415 - Maximum acceptable level of ozone.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 8 2012-04-01 2012-04-01 false Maximum acceptable level of ozone. 801.415 Section... level of ozone. (a) Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy. In order for ozone to be effective as a germicide, it must be present in...

  11. 21 CFR 801.415 - Maximum acceptable level of ozone.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 8 2013-04-01 2013-04-01 false Maximum acceptable level of ozone. 801.415 Section... level of ozone. (a) Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy. In order for ozone to be effective as a germicide, it must be present in...

  12. 21 CFR 801.415 - Maximum acceptable level of ozone.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 8 2011-04-01 2011-04-01 false Maximum acceptable level of ozone. 801.415 Section... level of ozone. (a) Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy. In order for ozone to be effective as a germicide, it must be present in...

  13. 21 CFR 801.415 - Maximum acceptable level of ozone.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Maximum acceptable level of ozone. 801.415 Section... level of ozone. (a) Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy. In order for ozone to be effective as a germicide, it must be present in...

  14. 21 CFR 801.415 - Maximum acceptable level of ozone.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Maximum acceptable level of ozone. 801.415 Section... level of ozone. (a) Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy. In order for ozone to be effective as a germicide, it must be present in...

  15. Single-image noise level estimation for blind denoising.

    PubMed

    Liu, Xinhao; Tanaka, Masayuki; Okutomi, Masatoshi

    2013-12-01

    Noise level is an important parameter to many image processing applications. For example, the performance of an image denoising algorithm can be much degraded due to the poor noise level estimation. Most existing denoising algorithms simply assume the noise level is known that largely prevents them from practical use. Moreover, even with the given true noise level, these denoising algorithms still cannot achieve the best performance, especially for scenes with rich texture. In this paper, we propose a patch-based noise level estimation algorithm and suggest that the noise level parameter should be tuned according to the scene complexity. Our approach includes the process of selecting low-rank patches without high frequency components from a single noisy image. The selection is based on the gradients of the patches and their statistics. Then, the noise level is estimated from the selected patches using principal component analysis. Because the true noise level does not always provide the best performance for nonblind denoising algorithms, we further tune the noise level parameter for nonblind denoising. Experiments demonstrate that both the accuracy and stability are superior to the state of the art noise level estimation algorithm for various scenes and noise levels.

  16. Assessment of noise levels in 200 Mosques in Riyadh, Saudi Arabia

    PubMed Central

    Al Shimemeri, S. A.; Patel, Chirag B.; Abdulrahman, Al Fayez

    2011-01-01

    Introduction: Noise-induced hearing loss (NIHL) is a recognized concern within the context of occupational and general health. However, noise levels are seldom studied at nonworkplace and nonabode sites that are visited regularly, e.g., places of worship. The purpose of this study was to assess the noise levels inside and outside of mosque prayer rooms and to compare the levels with established noise tolerance limits. Materials and Methods: A portable digital sound level meter was used to determine the noise level (measured in dB) inside and outside of mosque prayer rooms. The highest (peak) and lowest noise levels from each recording were tabulated. Statistical analysis was performed using a two-tailed Student's t-test (alpha = 0.05). Results: Noise levels were measured at 200 mosque prayer rooms from all 15 municipal districts of Riyadh, Saudi Arabia. Of these, 151 prayer rooms (75.5%) had both inside and outside noise measurements and the remaining 49 prayer rooms (24.5%) had only inside noise measurements. There was significantly greater noise outside compared to inside the prayer rooms, for both the highest noise level (outside: 87.8 ± 4.8 dB compared to inside: 85.8 ± 5.4 dB, P < 0.0001) and lowest noise level (outside: 58.4 ± 3.8 dB compared to inside: 56.6 ± 3.6 dB, P < 0.00001). In all, 112 of the inside highest level measurements (56%) and 113 of the outside highest level measurements (74.8%) were greater than 85 dB, the sound level at which NIHL has been shown to occur in occupational settings. Conclusion: A large proportion (56%) of mosque prayer rooms with inside peak noise measurements were above acceptable levels (85 dB), however, prayers certainly do not last for 8 continuous hours. Therefore, the level of noise at mosques is acceptable and in compliance with international norms of hearing safety; moreover, it does not present any risk to hearing in the long run. PMID:23210007

  17. Ambient noise levels and detection threshold in Norway.

    PubMed

    Demuth, Andrea; Ottemöller, Lars; Keers, Henk

    2016-01-01

    Ambient seismic noise is caused by a number of sources in specific frequency bands. The quantification of ambient noise makes it possible to evaluate station and network performance. We evaluate noise levels in Norway from the 2013 data set of the Norwegian National Seismic Network as well as two temporary deployments. Apart from the station performance, we studied the geographical and temporal variations, and developed a local noise model for Norway. The microseism peaks related to the ocean are significant in Norway. We, therefore, investigated the relationship between oceanic weather conditions and noise levels. We find a correlation of low-frequency noise (0.125-0.25 Hz) with wave heights up to 900 km offshore. High (2-10 Hz) and intermediate (0.5-5 Hz) frequency noise correlates only up to 450 km offshore with wave heights. From a geographic perspective, stations in southern Norway show lower noise levels for low frequencies due to a larger distance to the dominant noise sources in the North Atlantic. Finally, we studied the influence of high-frequency noise levels on earthquake detectability and found that a noise level increase of 10 dB decreases the detectability by 0.5 magnitude units. This method provides a practical way to consider noise variations in detection maps.

  18. Pure-tone audiometric threshold assessment with in-ear monitoring of noise levels

    PubMed Central

    Buckey, Jay C.; Fellows, Abigail M.; Jastrzembski, Benjamin G.; Maro, Isaac I.; Moshi, Ndeserua; Turk, Marvee; Clavier, Odile H.; Kline-Schoder, Robert J.

    2016-01-01

    Objective Our objective was to obtain reliable threshold measurements without a sound booth by using a passive noise-attenuating hearing protector combined with in-ear 1/3-octave band noise measurements to verify the ear canal was suitably quiet. Design We deployed laptop-based hearing testing systems to Tanzania as part of a study of HIV infection and hearing. An in-ear probe containing a microphone was used under the hearing protector for both the in-ear noise measurements and threshold audiometry. The 1/3-octave band noise spectrum from the microphone was displayed on the operator’s screen with acceptable levels in grey and unacceptable levels in red. Operators attempted to make all bars grey, but focused on achieving grey bars at 2000 Hz and above. Study Sample 624 adults and 260 children provided 3381 in-ear octave band measurements. Repeated measurements from 144 individuals who returned for testing on 3 separate occasions were also analyzed. Results In-ear noise levels exceeded the minimal permissible ambient noise levels (MPANL) for ears not covered, but not the dB SPL levels corresponding to 0 dB HL between 2–4 kHz. In-ear noise measurements were repeatable over time. Conclusions Reliable audiometry can be performed using a passive noise-attenuating hearing protector and in-ear noise measurements. PMID:23992487

  19. Noise level and MPEG-2 encoder statistics

    NASA Astrophysics Data System (ADS)

    Lee, Jungwoo

    1997-01-01

    Most software in the movie and broadcasting industries are still in analog film or tape format, which typically contains random noise that originated from film, CCD camera, and tape recording. The performance of the MPEG-2 encoder may be significantly degraded by the noise. It is also affected by the scene type that includes spatial and temporal activity. The statistical property of noise originating from camera and tape player is analyzed and the models for the two types of noise are developed. The relationship between the noise, the scene type, and encoder statistics of a number of MPEG-2 parameters such as motion vector magnitude, prediction error, and quant scale are discussed. This analysis is intended to be a tool for designing robust MPEG encoding algorithms such as preprocessing and rate control.

  20. The relative importance of noise level and number of events on human reactions to noise: Community survey findings and study methods

    NASA Technical Reports Server (NTRS)

    Fields, J. M.

    1980-01-01

    The data from seven surveys of community response to environmental noise are reanalyzed to assess the relative influence of peak noise levels and the numbers of noise events on human response. The surveys do not agree on the value of the tradeoff between the effects of noise level and numbers of events. The value of the tradeoff cannot be confidently specified in any survey because the tradeoff estimate may have a large standard error of estimate and because the tradeoff estimate may be seriously biased by unknown noise measurement errors. Some evidence suggests a decrease in annoyance with very high numbers of noise events but this evidence is not strong enough to lead to the rejection of the conventionally accepted assumption that annoyance is related to a log transformation of the number of noise events.

  1. Current levels of noise in an urban environment.

    PubMed

    Fisher, G H

    1973-12-01

    In 1961, the International Organization for Standardization prescribed upper tolerance limits for noise generated out-of-doors in residential districts. Between 1963 and 1970, vehicular traffic in the UK increased in volume by approximately 40%. This paper describes studies made throughout 1971 in which both peak and ambient noise-levels prevailing inside and outside buildings were measured. These levels were found greatly in excess of those regarded as tolerable ten years previously. Two methods for reducing noise-levels were considered. First, a barrier designed with the primary intention of reflecting rather than absorbing noise; secondly, a relatively simple form of double-glazing fitted to existing window frames. The barrier succeeded in reducing peak noise-levels but failed to influence ambients. The double-glazing attenuated both peak and ambient noise-levels significantly. Attention is drawn to the possibility of noise generated within buildings themselves becoming a source of discomfort for occupants and of annoyance to those outside. Noise-levels rising beyond 100 dB(A) were measured during evening business in the bar of a local hotel. A summary of data referring to noise-levels in the outdoor environment reveals that the upper tolerance limits prescribed by I S O are now being exceeded by 20 dB(A), or more, throughout 18 hours of the day. The findings are discussed in relation to the inevitable limits soon to be reached in adaptation of the human hearing mechanisms to increasing environment noise.

  2. Share 35 Changes Center Level Liver Acceptance Practices.

    PubMed

    Goldberg, David S; Levine, Matthew; Karp, Seth; Gilroy, Richard; Abt, Peter L

    2017-02-27

    Share 35 was implemented to provide improved access to organs for patients with MELD scores ≥35. However, little is known about the impact of Share 35 on organ offer acceptance rates. We evaluated all liver offers to adult patients that were ultimately transplanted between 1/1/2011-12/31/2015. The analyses focused on patients ranked in the top five positions of a given match run, and used multi-level mixed-effects models, clustering on individual waitlist candidate and transplant center. There was a significant interaction between Share 35 era and MELD category (p<0.001). Comparing offers to MELD score ≥35 patients, offers post-Share 35 were 36% less likely to be accepted compared to offers to MELD score ≥35 patients pre-Share 35 (adjusted OR: 0.64). There was no clinically meaningful difference in the DRI of livers that were declined for patients with an allocation MELD score ≥35 in the pre- vs post-Share 35 era. Organ offer acceptance rates for patients with an allocation MELD≥35 decreased in every region post-Share 35; the magnitude of these changes was bigger in regions 2, 3, 4, 5, 6, 7, and 11, compared to regions 8 and 9 that had regional sharing in place pre-Share 35. There were significant changes in organ offer acceptance rates at the center level pre- vs post-Share 35, and these changes varied across centers (p<0.001).

  3. Noise-adaptive nonlinear diffusion filtering of MR images with spatially varying noise levels.

    PubMed

    Samsonov, Alexei A; Johnson, Chris R

    2004-10-01

    Anisotropic diffusion filtering is widely used for MR image enhancement. However, the anisotropic filter is nonoptimal for MR images with spatially varying noise levels, such as images reconstructed from sensitivity-encoded data and intensity inhomogeneity-corrected images. In this work, a new method for filtering MR images with spatially varying noise levels is presented. In the new method, a priori information regarding the image noise level spatial distribution is utilized for the local adjustment of the anisotropic diffusion filter. Our new method was validated and compared with the standard filter on simulated and real MRI data. The noise-adaptive method was demonstrated to outperform the standard anisotropic diffusion filter in both image error reduction and image signal-to-noise ratio (SNR) improvement. The method was also applied to inhomogeneity-corrected and sensitivity encoding (SENSE) images. The new filter was shown to improve segmentation of MR brain images with spatially varying noise levels.

  4. Noise levels, noise annoyance, and hearing-related problems in a dental college.

    PubMed

    Ahmed, Hafiz Omer; Ali, Wesal Jasim

    2016-04-20

    Through a cross-sectional survey and integrated sound level meter, this research examined noise exposure and auditory- and nonauditory-related problems experienced by students of a dentistry college located in the United Arab Emirates (UAE). A structured interview questionnaire was used to examine hearing-related problems, noise annoyance, and awareness of 114 students toward noise. The results showed that maximum noise levels were between 65 and 79 dB(A) with peak levels (high and low frequencies) ranging between 89 and 93 dB(A). Around 80% of the students experienced a certain degree of noise annoyance; 54% reported one of the hearing-related problems; and about 10% claimed to have hearing loss to a certain extent. It is recommended that sound-absorbent materials be used during the construction of dental clinics and laboratories to reduce the noise levels.

  5. Plumbing noise: Pressure levels and perception in a luxury condominium

    NASA Astrophysics Data System (ADS)

    Watry, Derek

    2005-09-01

    A consulting project has recently been completed that addressed a number of noise concerns in a 9-unit, 20-year-old luxury condominium building in the San Francisco Bay Area. Among other tasks, the noise levels of four bathroom plumbing functions (flushing, showering, bath filling, bath draining) were measured in adjoining units and an inventory of noise concerns was collected. This paper reports the measured noise levels (nearly a 20-dBA range for every function!) and looks at the corresponding resident assessments not always clearly correlated with sound-pressure level.

  6. Classification image weights and internal noise level estimation

    NASA Technical Reports Server (NTRS)

    Ahumada, Albert J Jr

    2002-01-01

    For the linear discrimination of two stimuli in white Gaussian noise in the presence of internal noise, a method is described for estimating linear classification weights from the sum of noise images segregated by stimulus and response. The recommended method for combining the two response images for the same stimulus is to difference the average images. Weights are derived for combining images over stimuli and observers. Methods for estimating the level of internal noise are described with emphasis on the case of repeated presentations of the same noise sample. Simple tests for particular hypotheses about the weights are shown based on observer agreement with a noiseless version of the hypothesis.

  7. Evaluation of noise pollution level based upon community exposure and response data

    NASA Technical Reports Server (NTRS)

    Edmiston, R. D.

    1972-01-01

    The results and procedures are reported from an evaluation of noise pollution level as a predictor of annoyance, based on aircraft noise exposure and community response data. The measures of noise exposure presented include composite noise rating, noise exposure forecast, noise and number index. A proposed measure as a universal noise exposure measure for noise pollution level (L sub NP) is discussed.

  8. Techniques for Reducing Gun Blast Noise Levels: An Experimental Study

    DTIC Science & Technology

    1981-04-01

    gun muzzle blast noise level were in- vestigated experimentally to determine potential effectiveness and utility for existing major-caliber guns...impact on training and testing operations was to be minimized. Most of the noise reduction techniques that were investigated involve the use of some type ...shock noise level at the earth’s surface varies according to a complicated dependence upon projectile trajectory, projectile speed along the trajectory

  9. Noise Levels and Annoyance in Open Plan Educational Facilities

    ERIC Educational Resources Information Center

    Walsh, David P.

    1975-01-01

    This paper investigates the special considerations in defining an acoustical environment acceptable for educational purposes. Reviews various approaches for anticipating the degree of dissatisfaction or annoyance in school spaces, including statistical distributions of class noise, and deals with some design recommendations. (Author/MLF)

  10. Noise levels in the vicinity of traffic roundabouts

    NASA Astrophysics Data System (ADS)

    Lewis, P. T.; James, A.

    1980-09-01

    An experimental procedure for analyzing roundabout noise is described. Measurement of the noise from accelerating and decelerating traffic streams on the approach roads to roundabouts at a total of 70 positions at three sites are reported together with a simulation study of noise from central island traffic. The results show that, in general, noise from the accelerating traffic streams is within ±1 dB(A) of the free flow level on the same road and that the noise from the decelerating stream is equal to or less than the free flow level. The propagation of noise from the central island is expressed in the form of a nomogram. Good agreement between predicted and measured levels was found.

  11. WRAP low level waste (LLW) glovebox acceptance test report

    SciTech Connect

    Leist, K.J.

    1998-02-17

    In June 28, 1997, the Low Level Waste (LLW) glovebox was tested using glovebox acceptance test procedure 13031A-85. The primary focus of the glovebox acceptance test was to examine control system interlocks, display menus, alarms, and operator messages. Limited mechanical testing involving the drum ports, hoists, drum lifter, compacted drum lifter, drum tipper, transfer car, conveyors, lidder/delidder device and the supercompactor were also conducted. As of November 24, 1997, 2 of the 131 test exceptions that affect the LLW glovebox remain open. These items will be tracked and closed via the WRAP Master Test Exception Database. As part of Test Exception resolution/closure the responsible individual closing the Test Exception performs a retest of the affected item(s) to ensure the identified deficiency is corrected, and, or to test items not previously available to support testing. Test Exceptions are provided as appendices to this report.

  12. Effects of low levels of road traffic noise during the night: a laboratory study on number of events, maximum noise levels and noise sensitivity

    NASA Astrophysics Data System (ADS)

    Öhrström, E.

    1995-01-01

    The objective of the laboratory study presented here was to elucidate the importance of the number of noise events of a relatively low maximum noise level for sleep disturbance effects (body movements, subjective sleep quality, mood and performance). Twelve test persons slept eight nights under home-like laboratory settings. During four of these nights, each test person was exposed to 16, 32, 64 and 128 noise events respectively from recorded road traffic noise at a maximum noise level of 45 dB(A). All test persons (aged 20-42 years) considered themselves rather or very sensitive towards noise. The results show a significant decrease in subjective sleep quality at 32 noise events per night. At 64 noise events, 50% of the test persons experienced difficulties in falling asleep and, as compared with quiet nights, the time required to fall asleep was on average 12 minutes longer. The occurrence of body movements was significantly related to the reported number of awakenings, and the number of body movements was three times higher during the noisy periods of the night as compared with the quiet periods, indicating acute noise effects. The results of a vigilance test indicate that noise during the night might prolong the time needed to solve the test. Finally, and regardless of number of noise events, a significant increase in tiredness during the day was found after nights with noise exposure. In the paper comparisons are also made with earlier experiments using maximum noise levels of 50 and 60 dB(A).

  13. Investigations of internal noise levels for different target sizes, contrasts, and noise structures

    NASA Astrophysics Data System (ADS)

    Han, Minah; Choi, Shinkook; Baek, Jongduk

    2014-03-01

    To describe internal noise levels for different target sizes, contrasts, and noise structures, Gaussian targets with four different sizes (i.e., standard deviation of 2,4,6 and 8) and three different noise structures(i.e., white, low-pass, and highpass) were generated. The generated noise images were scaled to have standard deviation of 0.15. For each noise type, target contrasts were adjusted to have the same detectability based on NPW, and the detectability of CHO was calculated accordingly. For human observer study, 3 trained observers performed 2AFC detection tasks, and correction rate, Pc, was calculated for each task. By adding proper internal noise level to numerical observer (i.e., NPW and CHO), detectability of human observer was matched with that of numerical observers. Even though target contrasts were adjusted to have the same detectability of NPW observer, detectability of human observer decreases as the target size increases. The internal noise level varies for different target sizes, contrasts, and noise structures, demonstrating different internal noise levels should be considered in numerical observer to predict the detection performance of human observer.

  14. Local acceptance of a high-level nuclear waste repository.

    PubMed

    Sjöberg, Lennart

    2004-06-01

    The siting of nuclear waste facilities has been very difficult in all countries. Recent experience in Sweden indicates, however, that it may be possible, under certain circumstances, to gain local support for the siting of a high-level nuclear waste (HLNW) repository. The article reports on a study of attitudes and risk perceptions of people living in four municipalities in Sweden where HLNW siting was being intensely discussed at the political level, in media, and among the public. Data showed a relatively high level of consensus on acceptability of at least further investigation of the issue; in two cases local councils have since voted in favor of a go-ahead, and in one case only a very small majority defeated the issue. Models of policy attitudes showed that these were related to attitude to nuclear power, attributes of the perceived HLNW risk, and trust. Factors responsible for acceptance are discussed at several levels. One is the attitude to nuclear power, which is becoming more positive, probably because no viable alternatives are in sight. Other factors have to do with the extensive information programs conducted in these municipalities, and with the logical nature of the conclusion that they would be good candidates for hosting the national HLNW repository.

  15. Pilot Survey of Subway and Bus Stop Noise Levels

    PubMed Central

    Neitzel, Richard; Barrera, Marissa A.; Akram, Muhammad

    2006-01-01

    Excessive noise exposure is a serious global urban health problem, adversely affecting millions of people. One often cited source of urban noise is mass transit, particularly subway systems. As a first step in determining risk within this context, we recently conducted an environmental survey of noise levels of the New York City transit system. Over 90 noise measurements were made using a sound level meter. Average and maximum noise levels were measured on subway platforms, and maximum levels were measured inside subway cars and at several bus stops for comparison purposes. The average noise level measured on the subway platforms was 86 ± 4 dBA (decibel-A weighting). Maximum levels of 106, 112, and 89 dBA were measured on subway platforms, inside subway cars, and at bus stops, respectively. These results indicate that noise levels in subway and bus stop environments have the potential to exceed recommended exposure guidelines from the World Health Organization (WHO) and U.S. Environmental Protection Agency (EPA), given sufficient exposure duration. Risk reduction strategies following the standard hierarchy of control measures should be applied, where feasible, to reduce subway noise exposure. PMID:16802179

  16. Definition of 1992 Technology Aircraft Noise Levels and the Methodology for Assessing Airplane Noise Impact of Component Noise Reduction Concepts

    NASA Technical Reports Server (NTRS)

    Kumasaka, Henry A.; Martinez, Michael M.; Weir, Donald S.

    1996-01-01

    This report describes the methodology for assessing the impact of component noise reduction on total airplane system noise. The methodology is intended to be applied to the results of individual study elements of the NASA-Advanced Subsonic Technology (AST) Noise Reduction Program, which will address the development of noise reduction concepts for specific components. Program progress will be assessed in terms of noise reduction achieved, relative to baseline levels representative of 1992 technology airplane/engine design and performance. In this report, the 1992 technology reference levels are defined for assessment models based on four airplane sizes - an average business jet and three commercial transports: a small twin, a medium sized twin, and a large quad. Study results indicate that component changes defined as program final goals for nacelle treatment and engine/airframe source noise reduction would achieve from 6-7 EPNdB reduction of total airplane noise at FAR 36 Stage 3 noise certification conditions for all of the airplane noise assessment models.

  17. Relationship between Aircraft Noise Contour Area and Noise Levels at Certification Points

    NASA Technical Reports Server (NTRS)

    Powell, Clemans A.

    2003-01-01

    The use of sound exposure level contour area reduction has been proposed as an alternative or supplemental metric of progress and success for the NASA Quiet Aircraft Technology program, which currently uses the average of predicted noise reductions at three community locations. As the program has expanded to include reductions in airframe noise as well as reduction due to optimization of operating procedures for lower noise, there is concern that the three-point methodology may not represent a fair measure of benefit to airport communities. This paper addresses several topics related to this proposal: (1) an analytical basis for a relationship between certification noise levels and noise contour areas for departure operations is developed, (2) the relationship between predicted noise contour area and the noise levels measured or predicted at the certification measurement points is examined for a wide range of commercial and business aircraft, and (3) reductions in contour area for low-noise approach scenarios are predicted and equivalent reductions in source noise are determined.

  18. Intrinsic Noise Level of Noise Cross-Correlation Functions and its Implication to Source Population of Ambient noises

    NASA Astrophysics Data System (ADS)

    Chen, Ying-Nien; Gung, Yuancheng; Chiao, Ling-Yun; Rhie, Junkee

    2017-01-01

    SUMMARYWe present a quantitative procedure to evaluate the intrinsic <span class="hlt">noise</span> <span class="hlt">level</span> (INL) of the <span class="hlt">noise</span> cross-correlation function (NCF). The method is applied to realistic NCFs derived from the continuous data recorded by the seismic arrays in Taiwan and Korea. The obtained temporal evolution of NCF <span class="hlt">noise</span> <span class="hlt">level</span> follows fairly the prediction of the theoretical formulation, confirming the feasibility of the method. We then apply the obtained INL to the assessment of data quality and the source characteristics of ambient <span class="hlt">noise</span>. We show that the INL-based signal-to-<span class="hlt">noise</span> ratio provides an exact measure for the true <span class="hlt">noise</span> <span class="hlt">level</span> within the NCF and better resolving power for the NCF quality, and such measurement can be implemented to any time windows of the NCFs to evaluate the quality of overtones or coda waves. Moreover, since NCF amplitudes are influenced by both the population and excitation strengths of <span class="hlt">noises</span>, while INL is primarily sensitive to the overall source population, with information from both measurements, we may better constrain the source characteristics of seismic ambient <span class="hlt">noises</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MS%26E..180a2121R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MS%26E..180a2121R"><span>Measurement of <span class="hlt">Noise</span> <span class="hlt">Level</span> in Enumeration Station in Rubber Industry</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rizkya, I.; Syahputri, K.; Sari, R. M.; Siregar, I.</p> <p>2017-03-01</p> <p>This research was conducted in companies engaged in the production of crumb rubber. In the rubber industry, the potential <span class="hlt">noise</span> occurs in the enumeration station. Stations enumeration use machine and equipment that potentially generated <span class="hlt">noise</span>. <span class="hlt">Noise</span> can be defined as an unwanted sound because it does not fit the context of space and time so that may interfere with the comfort and human health. The <span class="hlt">noise</span> <span class="hlt">level</span> measured at random during the initial observation station enumeration is 101.8 dB. This value has exceeded the Threshold Limit Value (TLV) Kep-51 / MEN / 1999 and SNI No. 16-7063-2004 so research must be done to measure the <span class="hlt">level</span> of <span class="hlt">noise</span> in the enumeration station. Quantitative methods used in the study. Observations made with the calculation method of equivalent <span class="hlt">noise</span> <span class="hlt">level</span>. Observations were made on six measurement points for one shift for three days. The results showed the <span class="hlt">noise</span> <span class="hlt">level</span> over the Threshold Limit Value is equal to 85 dBA/8 hours. Based on the measurement results, the whole point of observation was far above the threshold Limit Value (TLV). The highest <span class="hlt">noise</span> <span class="hlt">level</span> equivalent is in the observation point 6 with a value of 102, 21 dB.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/AD1012409','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/AD1012409"><span><span class="hlt">Noise</span> <span class="hlt">Levels</span> in the Operating Room</span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>2001-10-01</p> <p>CRNA vigilance is crucial to the well-being of patients, and if the cause of the <span class="hlt">noise</span> can be identified and corrected , CRNAs in the future...64.6 52.2 85.5 107.0 56.2 23 Open shoulder GETA 64.3 48.3 88.9 112.6 54.6 24 Cancelled (before induction) 66.8 50.6 95.0 117.2 53.9 25 Osteotomy ...acromioplasty Knee arthroscopy Knee arthroscopy Knee arthroscopy Finger pinning Wrist pinning Open shoulder Cancelled before inducing Osteotomy ACL</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_4 --> <div id="page_5" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="81"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25175843','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25175843"><span>Reduction of classroom <span class="hlt">noise</span> <span class="hlt">levels</span> using group contingencies.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ring, Brandon M; Sigurdsson, Sigurdur O; Eubanks, Sean L; Silverman, Kenneth</p> <p>2014-01-01</p> <p>The therapeutic workplace is an employment-based abstinence reinforcement intervention for unemployed drug users where trainees receive on-the-job employment skills training in a classroom setting. The study is an extension of prior therapeutic workplace research, which suggested that trainees frequently violated <span class="hlt">noise</span> standards. Participants received real-time graphed feedback of <span class="hlt">noise</span> <span class="hlt">levels</span> and had the opportunity to earn monetary group reinforcement for maintaining a low number of <span class="hlt">noise</span> violations. Results suggested that feedback and monetary reinforcement reduced the number of <span class="hlt">noise</span> violations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2707461','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2707461"><span><span class="hlt">Noise</span> <span class="hlt">Levels</span> Associated With New York City's Mass Transit Systems</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Gershon, Robyn R. M.; Zeltser, Marina; Canton, Allison; Akram, Muhammad</p> <p>2009-01-01</p> <p>Objectives. We measured <span class="hlt">noise</span> <span class="hlt">levels</span> associated with various forms of mass transit and compared them to exposure guidelines designed to protect against <span class="hlt">noise</span>-induced hearing loss. Methods. We used <span class="hlt">noise</span> dosimetry to measure time-integrated <span class="hlt">noise</span> <span class="hlt">levels</span> in a representative sample of New York City mass transit systems (subways, buses, ferries, tramway, and commuter railways) aboard transit vehicles and at vehicle boarding platforms or terminals during June and July 2007. Results. Of the transit types evaluated, subway cars and platforms had the highest associated equivalent continuous average (Leq) and maximum <span class="hlt">noise</span> <span class="hlt">levels</span>. All transit types had Leq <span class="hlt">levels</span> appreciably above 70 A-weighted decibels, the threshold at which <span class="hlt">noise</span>-induced hearing loss is considered possible. Conclusions. Mass transit <span class="hlt">noise</span> exposure has the potential to exceed limits recommended by the World Health Organization and the US Environmental Protection Agency and thus cause <span class="hlt">noise</span>-induced hearing loss among riders of all forms of mass transit given sufficient exposure durations. Environmental noise–control efforts in mass transit and, in cases in which controls are infeasible, the use of personal hearing protection would benefit the ridership's hearing health. PMID:19542046</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19850022454','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19850022454"><span>Effects of propeller rotation direction on airplane interior <span class="hlt">noise</span> <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Willis, C. M.; Mayes, W. H.; Daniels, E. F.</p> <p>1985-01-01</p> <p>Interior <span class="hlt">noise</span> measurements for upsweeping and downsweeping movement of the propeller blade tips past the fuselage were made on a twin-engine airplane and on two simplified fuselage models. Changes in interior <span class="hlt">noise</span> <span class="hlt">levels</span> of as much as 8 dB reversal of propeller rotation direction were measured for some configurations and test conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800019333','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800019333"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> near streets, effectiveness and cost abatement measures</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lang, J.</p> <p>1980-01-01</p> <p>During the years 1975-1978, research was carried concerning the current <span class="hlt">noise</span> <span class="hlt">levels</span> near streets, the annoyance felt by the population, possible <span class="hlt">noise</span> abatement measures for these streets, and the economic impact of such measures. The results of the research are summarized.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2013-05-01/pdf/2013-10282.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2013-05-01/pdf/2013-10282.pdf"><span>78 FR 25523 - <span class="hlt">Acceptance</span> of <span class="hlt">Noise</span> Exposure Map Notice for Oakland County International Airport, Pontiac, Michigan</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2013-05-01</p> <p>... <span class="hlt">noise</span> exposure contours depicted on a <span class="hlt">noise</span> exposure map submitted under section 47503 of the Act, it... properties with regard to the depicted <span class="hlt">noise</span> contours, or in interpreting the <span class="hlt">noise</span> exposure maps to resolve... <span class="hlt">noise</span> exposure contours onto the map depicting properties on the surface rests exclusively with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007SPIE.6494E..05V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007SPIE.6494E..05V"><span>Threshold value for <span class="hlt">acceptable</span> video quality using signal-to-<span class="hlt">noise</span> ratio</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vaahteranoksa, Mikko; Vuori, Tero</p> <p>2007-01-01</p> <p><span class="hlt">Noise</span> decreases video quality considerably, particularly in dark environments. In a video clip, <span class="hlt">noise</span> can be seen as an unwanted spatial or temporal variation in pixel values. The object of the study was to find a threshold value for signal-to-<span class="hlt">noise</span> ratio (SNR) in which the video quality is perceived to be good enough. Different illumination <span class="hlt">levels</span> for video shooting were studied using both subjective and objective (SNR measurements) methodologies. Five camcorders were selected to cover different sensor technologies, recording formats and price categories. The test material for the subjective test was recorded in an environment simulator, where it was possible to adjust lighting <span class="hlt">levels</span>. Double staircase test was used as the subjective test method. The test videos for objective measurements were recorded using an ISO 15739 based environment. There was a correlation found between objective and subjective measurements, between measured SNR and perceived quality. Good enough video quality was reached between SNR values of 15.3 dB and 17.2 dB. With 3CCD and super HAD-CCD technologies, video quality was brighter, less noisy, and the SNR was better in low light conditions compared to the quality with conventional CCDs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=test+AND+technology&pg=6&id=EJ1047536','ERIC'); return false;" href="http://eric.ed.gov/?q=test+AND+technology&pg=6&id=EJ1047536"><span>Measuring Technology <span class="hlt">Acceptance</span> <span class="hlt">Level</span> of Turkish Pre-Service English Teachers by Using Technology <span class="hlt">Acceptance</span> Model</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Kirmizi, Özkan</p> <p>2014-01-01</p> <p>The aim of this study is to investigate technology <span class="hlt">acceptance</span> of prospective English teachers by using Technology <span class="hlt">Acceptance</span> Model (TAM) in Turkish context. The study is based on Structural Equation Model (SEM). The participants of the study from English Language Teaching Departments of Hacettepe, Gazi and Baskent Universities. The participants…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940009563','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940009563"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> from a model turbofan engine with simulated <span class="hlt">noise</span> control measures applied</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hall, David G.; Woodward, Richard P.</p> <p>1993-01-01</p> <p>A study of estimated full-scale <span class="hlt">noise</span> <span class="hlt">levels</span> based on measured <span class="hlt">levels</span> from the Advanced Ducted Propeller (ADP) sub-scale model is presented. Testing of this model was performed in the NASA Lewis Low Speed Anechoic Wind Tunnel at a simulated takeoff condition of Mach 0.2. Effective Perceived <span class="hlt">Noise</span> <span class="hlt">Level</span> (EPNL) estimates for the baseline configuration are documented, and also used as the control case in a study of the potential benefits of two categories of <span class="hlt">noise</span> control. The effect of active <span class="hlt">noise</span> control is evaluated by artificially removing various rotor-stator interaction tones. Passive <span class="hlt">noise</span> control is simulated by applying a notch filter to the wind tunnel data. Cases with both techniques are included to evaluate hybrid active-passive <span class="hlt">noise</span> control. The results for EPNL values are approximate because the original source data was limited in bandwidth and in sideline angular coverage. The main emphasis is on comparisons between the baseline and configurations with simulated <span class="hlt">noise</span> control measures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19850022453','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19850022453"><span>A study of interior <span class="hlt">noise</span> <span class="hlt">levels</span>, <span class="hlt">noise</span> sources and transmission paths in light aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hayden, R. E.; Murray, B. S.; Theobald, M. A.</p> <p>1983-01-01</p> <p>The interior <span class="hlt">noise</span> <span class="hlt">levels</span> and spectral characteristics of 18 single-and twin-engine propeller-driven light aircraft, and source-path diagnosis of a single-engine aircraft which was considered representative of a large part of the fleet were studied. The purpose of the flight surveys was to measure internal <span class="hlt">noise</span> <span class="hlt">levels</span> and identify principal <span class="hlt">noise</span> sources and paths under a carefully controlled and standardized set of flight procedures. The diagnostic tests consisted of flights and ground tests in which various parts of the aircraft, such as engine mounts, the engine compartment, exhaust pipe, individual panels, and the wing strut were instrumented to determine source <span class="hlt">levels</span> and transmission path strengths using the transfer function technique. Predominant source and path combinations are identified. Experimental techniques are described. Data, transfer function calculations to derive source-path contributions to the cabin acoustic environment, and implications of the findings for <span class="hlt">noise</span> control design are analyzed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19750019994','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19750019994"><span>Interior <span class="hlt">noise</span> <span class="hlt">levels</span> of two propeller-driven light aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Catherines, J. J.; Mayes, W. H.</p> <p>1975-01-01</p> <p>The relationships between aircraft operating conditions and interior <span class="hlt">noise</span> and the degree to which ground testing can be used in lieu of flight testing for performing interior <span class="hlt">noise</span> research were studied. The results show that the <span class="hlt">noise</span> inside light aircraft is strongly influenced by the rotational speed of the engine and propeller. Both the overall <span class="hlt">noise</span> and low frequency spectra <span class="hlt">levels</span> were observed to decrease with increasing high speed rpm operations during flight. This phenomenon and its significance is not presently understood. Comparison of spectra obtained in flight with spectra obtained on the ground suggests that identification of frequency components and relative amplitude of propeller and engine <span class="hlt">noise</span> sources may be evaluated on stationary aircraft.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3891787','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3891787"><span>Pilot task-based assessment of <span class="hlt">noise</span> <span class="hlt">levels</span> among firefighters</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Neitzel, RL; Hong, O; Quinlan, P; Hulea, R</p> <p>2012-01-01</p> <p>PURPOSE Over one million American firefighters are routinely exposed to various occupational hazards agents. While efforts have been made to identify and reduce some causes of injuries and illnesses among firefighters, relatively little has been done to evaluate and understand occupational <span class="hlt">noise</span> exposures in this group. The purpose of this pilot study was to apply a task-based <span class="hlt">noise</span> exposure assessment methodology to firefighting operations to evaluate potential <span class="hlt">noise</span> exposure sources, and to use collected task-based <span class="hlt">noise</span> <span class="hlt">levels</span> to create <span class="hlt">noise</span> exposure estimates for evaluation of risk of <span class="hlt">noise</span>-induced hearing loss by comparison to the 8-hr and 24-hr recommended exposure limits (RELs) for <span class="hlt">noise</span> of 85 and 80.3 dBA, respectively. METHODS Task-based <span class="hlt">noise</span> exposures (n=100 measurements) were measured in three different fire departments (a rural department in Southeast Michigan and suburban and urban departments in Northern California). These <span class="hlt">levels</span> were then combined with time-at-task information collected from firefighters to estimate 8-hr <span class="hlt">noise</span> exposures for the rural and suburban fire departments (n=6 estimates for each department). Data from 24-hr dosimetry measurements and crude self-reported activity categories from the urban fire department (n=4 measurements) were used to create 24-hr exposure estimates to evaluate the bias associated with the task-based estimates. RESULTS Task-based <span class="hlt">noise</span> <span class="hlt">levels</span> were found to range from 82–109 dBA, with the highest <span class="hlt">levels</span> resulting from use of saws and pneumatic chisels. Some short (e.g., 30 min) sequences of common tasks were found to result in nearly an entire allowable daily exposure. The majority of estimated 8-hr and 24-hr exposures exceeded the relevant recommended exposure limit. Predicted 24-hr exposures showed substantial imprecision in some cases, suggesting the need for increased task specificity. CONCLUSIONS The results indicate potential for overexposure to <span class="hlt">noise</span> from a variety of firefighting tasks and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/AD1013168','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/AD1013168"><span>Factors Affecting <span class="hlt">Noise</span> <span class="hlt">Levels</span> of High-Speed Handpieces</span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>2012-06-01</p> <p>office communication and increase patient anxiety. Purpose: To determine if three <span class="hlt">noise</span>-reducing techniques utilized in larger scale , non- dental...hearing loss may cause confusion, fear, and loneliness , and that sometimes hearing loss is accompanied by dizziness, which would be a handicap in the...employee <span class="hlt">noise</span> exposures equal or exceed an 8- hour time-weighted average sound <span class="hlt">level</span> (TWA) of 85 decibels measured on the A scale (slow response) or</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002APS..MARG29005V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002APS..MARG29005V"><span>Networking with <span class="hlt">noise</span> at the molecular, cellular, and population <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vilar, Jose</p> <p>2002-03-01</p> <p>The intrinsic stochastic nature of biochemical reactions affects enzymatic and transcriptional networks at different <span class="hlt">levels</span>. Yet, cells are able to function effectively and consistently amidst such random fluctuations. I will discuss some molecular mechanisms that are able to reduce the intrinsic <span class="hlt">noise</span> of chemical reactions, how suitable designs can make networks resistant to <span class="hlt">noise</span>, and what strategies can be used by populations to achieve precise functions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20557274','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20557274"><span>Ambient <span class="hlt">noise</span> <span class="hlt">levels</span> and infant hearing screening programs in developing countries: an observational report.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Olusanya, Bolajoko O</p> <p>2010-08-01</p> <p>Considering that current newborn/infant hearing screening (NHS) instruments were designed primarily for use in developed countries, this study set out to ascertain the potential effects of higher ambient <span class="hlt">noise</span> <span class="hlt">levels</span> on transient-evoked otoacoustic emissions (TEOAE) in sub-Saharan Africa. Data was drawn from two hospital-based and community-based NHS programs in Lagos, Nigeria, with a total screened population of 11 893 infants. Two automated TEOAE screening devices-Echo-Screen and ECHOCHECK-were available for this study. Ambient <span class="hlt">noise</span> <span class="hlt">levels</span> ranged from 61.0-90.5 dBA in the hospital wards and 55.6-82.5 dBA in the community health centers. One TEOAE model could not be activated at the prevailing <span class="hlt">noise</span> <span class="hlt">levels</span>. No significant pattern was observed in average <span class="hlt">noise</span> <span class="hlt">levels</span> and overall TEOAE referrals across all screening sites. However, the false-positive rates ranged from 1.4-13.8%. This study suggests that valid TEOAE screening is attainable in the Negroid race in settings with ambient <span class="hlt">noise</span> <span class="hlt">levels</span> up to 68 dBA but the associated high false-positive rates may necessitate additional screening with auditory brainstem response to achieve <span class="hlt">acceptable</span> overall referral rates for timely diagnostic evaluation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19740018137','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19740018137"><span>Advanced supersonic propulsion study. [with emphasis on <span class="hlt">noise</span> <span class="hlt">level</span> reduction</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sabatella, J. A. (Editor)</p> <p>1974-01-01</p> <p>A study was conducted to determine the promising propulsion systems for advanced supersonic transport application, and to identify the critical propulsion technology requirements. It is shown that <span class="hlt">noise</span> constraints have a major effect on the selection of the various engine types and cycle parameters. Several promising advanced propulsion systems were identified which show the potential of achieving lower <span class="hlt">levels</span> of sideline jet <span class="hlt">noise</span> than the first generation supersonic transport systems. The non-afterburning turbojet engine, utilizing a very high <span class="hlt">level</span> of jet suppression, shows the potential to achieve FAR 36 <span class="hlt">noise</span> <span class="hlt">level</span>. The duct-heating turbofan with a low <span class="hlt">level</span> of jet suppression is the most attractive engine for <span class="hlt">noise</span> <span class="hlt">levels</span> from FAR 36 to FAR 36 minus 5 EPNdb, and some series/parallel variable cycle engines show the potential of achieving <span class="hlt">noise</span> <span class="hlt">levels</span> down to FAR 36 minus 10 EPNdb with moderate additional penalty. The study also shows that an advanced supersonic commercial transport would benefit appreciably from advanced propulsion technology. The critical propulsion technology needed for a viable supersonic propulsion system, and the required specific propulsion technology programs are outlined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970028883','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970028883"><span>Confusion <span class="hlt">Noise</span> <span class="hlt">Level</span> Due to Galactic and Extragalactic Binaries</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bender, Peter L.; Hils, Dieter</p> <p>1997-01-01</p> <p>We have revised our earlier rough estimate of the combined galactic and extragalactic binary confusion <span class="hlt">noise</span> <span class="hlt">level</span> curve for gravitational waves. This was done to correct some numerical errors and to allow for roughly three frequency bins worth of information about weaker sources being lost for each galactic binary signal that is removed from the data. The results are still based on the spectral amplitude estimates for different types of galactic binaries reported by Hils et al in 1990, and assume that the gravitational wave power spectral densities for other galaxies are proportional to the optical luminosities. The estimated confusion <span class="hlt">noise</span> <span class="hlt">level</span> drops to the LISA instrumental <span class="hlt">noise</span> <span class="hlt">level</span> at between roughly 3 and 8 MHz.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27563964','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27563964"><span>Preparation of Ultracold Atom Clouds at the Shot <span class="hlt">Noise</span> <span class="hlt">Level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gajdacz, M; Hilliard, A J; Kristensen, M A; Pedersen, P L; Klempt, C; Arlt, J J; Sherson, J F</p> <p>2016-08-12</p> <p>We prepare number stabilized ultracold atom clouds through the real-time analysis of nondestructive images and the application of feedback. In our experiments, the atom number N∼10^{6} is determined by high precision Faraday imaging with uncertainty ΔN below the shot <span class="hlt">noise</span> <span class="hlt">level</span>, i.e., ΔN<sqrt[N]. Based on this measurement, feedback is applied to reduce the atom number to a user-defined target, whereupon a second imaging series probes the number stabilized cloud. By this method, we show that the atom number in ultracold clouds can be prepared below the shot <span class="hlt">noise</span> <span class="hlt">level</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950005928','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950005928"><span>En route <span class="hlt">noise</span> <span class="hlt">levels</span> from propfan test assessment airplane</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Garber, Donald P.; Willshire, William L., Jr.</p> <p>1994-01-01</p> <p>The en route <span class="hlt">noise</span> test was designed to characterize propagation of propfan <span class="hlt">noise</span> from cruise altitudes to the ground. In-flight measurements of propfan source <span class="hlt">levels</span> and directional patterns were made by a chase plane flying in formation with the propfan test assessment (PTA) airplane. Ground <span class="hlt">noise</span> measurements were taken during repeated flights over a distributed microphone array. The microphone array on the ground was used to provide ensemble-averaged estimates of mean flyover <span class="hlt">noise</span> <span class="hlt">levels</span>, establish confidence limits for those means, and measure propagation-induced <span class="hlt">noise</span> variability. Even for identical nominal cruise conditions, peak sound <span class="hlt">levels</span> for individual overflights varied substantially about the average, particularly when overflights were performed on different days. Large day-to-day variations in peak <span class="hlt">level</span> measurements appeared to be caused by large day-to-day differences in propagation conditions and tended to obscure small variations arising from operating conditions. A parametric evaluation of the sensitivity of this prediction method to weather measurement and source <span class="hlt">level</span> uncertainties was also performed. In general, predictions showed good agreement with measurements. However, the method was unable to predict short-term variability of ensemble-averaged data within individual overflights. Although variations in absorption appear to be the dominant factor in variations of peak sound <span class="hlt">levels</span> recorded on the ground, accurate predictions of those <span class="hlt">levels</span> require that a complete description of operational conditions be taken into account. The comprehensive and integrated methods presented in this paper have adequately predicted ground-measured sound <span class="hlt">levels</span>. On average, peak sound <span class="hlt">levels</span> were predicted within 3 dB for each of the three different cruise conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18646974','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18646974"><span>Self-reported sleep disturbances due to railway <span class="hlt">noise</span>: exposure-response relationships for nighttime equivalent and maximum <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Aasvang, Gunn Marit; Moum, Torbjorn; Engdahl, Bo</p> <p>2008-07-01</p> <p>The objective of the present survey was to study self-reported sleep disturbances due to railway <span class="hlt">noise</span> with respect to nighttime equivalent <span class="hlt">noise</span> <span class="hlt">level</span> (L(p,A,eq,night)) and maximum <span class="hlt">noise</span> <span class="hlt">level</span> (L(p,A,max)). A sample of 1349 people in and around Oslo in Norway exposed to railway <span class="hlt">noise</span> was studied in a cross-sectional survey to obtain data on sleep disturbances, sleep problems due to <span class="hlt">noise</span>, and personal characteristics including <span class="hlt">noise</span> sensitivity. Individual <span class="hlt">noise</span> exposure <span class="hlt">levels</span> were determined outside of the bedroom facade, the most-exposed facade, and inside the respondents' bedrooms. The exposure-response relationships were analyzed by using logistic regression models, controlling for possible modifying factors including the number of <span class="hlt">noise</span> events (train pass-by frequency). L(p,A,eq,night) and L(p,A,max) were significantly correlated, and the proportion of reported <span class="hlt">noise</span>-induced sleep problems increased as both L(p,A,eq,night) and L(p,A,max) increased. <span class="hlt">Noise</span> sensitivity, type of bedroom window, and pass-by frequency were significant factors affecting <span class="hlt">noise</span>-induced sleep disturbances, in addition to the <span class="hlt">noise</span> exposure <span class="hlt">level</span>. Because about half of the study population did not use a bedroom at the most-exposed side of the house, the exposure-response curve obtained by using <span class="hlt">noise</span> <span class="hlt">levels</span> for the most-exposed facade underestimated <span class="hlt">noise</span>-induced sleep disturbance for those who actually have their bedroom at the most-exposed facade.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12710923','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12710923"><span>Predicting mass rapid transit <span class="hlt">noise</span> <span class="hlt">levels</span> on an elevated station.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pamanikabud, Pichai; Paoprayoon, Suwajchai</p> <p>2003-04-01</p> <p>This study developed a <span class="hlt">noise</span> prediction model for elevated mass rapid transit (MRT) platforms. Relevant physical and operational parameters (e.g. cruise speed, acceleration and deceleration rates for trains, building façade setbacks and so on) were collected from the Bangkok mass transit system (BTS), the first elevated MRT system operated in Bangkok, Thailand. The equivalent continuous sound pressure <span class="hlt">levels</span> (L(Aeq)) were collected from both sides of the MRT stations at the center of each platform. The relevant parameters were collected on both platforms and ground <span class="hlt">level</span>, on both sides of MRT stations. These parameters were statistically tested to determine their correlation with MRT <span class="hlt">noise</span>. The final model was built from highly correlated parameters using multiple regression analysis with a stepwise regression technique. Statistical evaluation showed a high degree of goodness-of-fit test for the model to the observed data. Therefore, it can be efficiently used for the projection of MRT <span class="hlt">noise</span> in the affected areas.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_5 --> <div id="page_6" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="101"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19910062646&hterms=ionograms&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dionograms','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19910062646&hterms=ionograms&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dionograms"><span>Wideband <span class="hlt">noise</span> observed at ground <span class="hlt">level</span> in the auroral region</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Benson, Robert F.; Desch, Michael D.</p> <p>1991-01-01</p> <p>A sideband <span class="hlt">noise</span> event was detected at ground <span class="hlt">level</span> from the Andoya Rocket Range in Norway in January 1989. The signals were observed on four commercial communication receivers (tuned to 159, 515, 905, and 1200 kHz), an ionosonde (200-kHz to 3.5-MHz interference-free observations) and a riometer (32.5 MHz). The event, which occurred during a period of magnetic disturbance near magnetic midnight, was the only one observed during nearly 3 weeks of operations. This low frequency-of-occurrence is attributed partly to high local <span class="hlt">noise</span> <span class="hlt">levels</span>. The ease with which this event was identified on the ionograms produced by the local ionosonde suggests that routine ionosonde recordings should be inspected in search for such events. Such an effort would enhance existing research directed toward developing techniques for identifying quiet communication channels and help to identify the origin and frequency-of-occurrence of high-latitude wideband <span class="hlt">noise</span> events.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/5152973','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/5152973"><span>Wideband <span class="hlt">noise</span> observed at ground <span class="hlt">level</span> in the auroral region</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Benson, R.F.; Desch, M.D. )</p> <p>1991-08-01</p> <p>A sideband <span class="hlt">noise</span> event was detected at ground <span class="hlt">level</span> from the Andoya Rocket Range in Norway in January 1989. The signals were observed on four commercial communication receivers (tuned to 159, 515, 905, and 1200 kHz), an ionosonde (200-kHz to 3.5-MHz interference-free observations) and a riometer (32.5 MHz). The event, which occurred during a period of magnetic disturbance near magnetic midnight, was the only one observed during nearly 3 weeks of operations. This low frequency-of-occurrence is attributed partly to high local <span class="hlt">noise</span> <span class="hlt">levels</span>. The ease with which this event was identified on the ionograms produced by the local ionosonde suggests that routine ionosonde recordings should be inspected in search for such events. Such an effort would enhance existing research directed toward developing techniques for identifying quiet communication channels and help to identify the origin and frequency-of-occurrence of high-latitude wideband <span class="hlt">noise</span> events. 20 refs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4752708','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4752708"><span>Low stimulus environments: reducing <span class="hlt">noise</span> <span class="hlt">levels</span> in continuing care</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Brown, Juliette; Fawzi, Waleed; Shah, Amar; Joyce, Margaret; Holt, Genevieve; McCarthy, Cathy; Stevenson, Carmel; Marange, Rosca; Shakes, Joy; Solomon-Ayeh, Kwesi</p> <p>2016-01-01</p> <p>In the low stimulus environment project, we aimed to reduce the <span class="hlt">levels</span> of intrusive background <span class="hlt">noise</span> on an older adult mental health ward, combining a very straightforward measure on decibel <span class="hlt">levels</span> with a downstream measure of reduced distress and agitation as expressed in incidents of violence. This project on reducing background <span class="hlt">noise</span> <span class="hlt">levels</span> on older adult wards stemmed from work the team had done on reducing <span class="hlt">levels</span> of violence and aggression. We approached the problem using quality improvement methods. Reducing harm to patients and staff is a strategic aim of our Trust and in our efforts we were supported by the Trust's extensive programme of quality improvement, including training and support provided by the Institute for Healthcare Improvement and the trust's own Quality Improvement team. Prior to the project we were running a weekly multi-disciplinary quality improvement group on the ward. We established from this a sub-group to address the specific problem of <span class="hlt">noise</span> <span class="hlt">levels</span> and invited carers of people with dementia on our ward to the group. The project was led by nursing staff. We used a <span class="hlt">noise</span> meter app readily downloadable from the internet to monitor background <span class="hlt">noise</span> <span class="hlt">levels</span> on the ward and establish a baseline measure. As a group we used a driver diagram to identify an overall aim and a clear understanding of the major factors that would drive improvements. We also used a staff and carer survey to identify further areas to work on. Change ideas that came from staff and carers included the use of the <span class="hlt">noise</span> meter to track and report back on <span class="hlt">noise</span> <span class="hlt">levels</span>, the use of posters to remind staff about <span class="hlt">noise</span> <span class="hlt">levels</span>, the introduction of a visual indication of current <span class="hlt">noise</span> <span class="hlt">levels</span> (the Yacker Tracker), the addition of relaxing background music, and adaptations to furniture and environment. We tested many of these over the course of nine months in 2015, using the iterative learning gained from multiple PDSA cycles. The specific aim was a decrease from above 60dB to</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24810556','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24810556"><span>Effect of external classroom <span class="hlt">noise</span> on schoolchildren's reading and mathematics performance: correlation of <span class="hlt">noise</span> <span class="hlt">levels</span> and gender.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Papanikolaou, M; Skenteris, N; Piperakis, S M</p> <p>2015-02-01</p> <p>The present study investigated the effect of low, medium, and high traffic road <span class="hlt">noise</span> as well as irrelevant background speech <span class="hlt">noise</span> on primary school children's reading and mathematical performance. A total of 676 participants (324 boys, 47.9% and 352 girls, 52.1%) of the 4th and 5th elementary classes participated in the project. The participants were enrolled in public primary schools from urban areas and had ages ranging from 9 to 10 years and from. Schools were selected on the basis of increasing <span class="hlt">levels</span> of exposure to road traffic <span class="hlt">noise</span> and then classified into three categories (Low <span class="hlt">noise</span>: 55-66 dB, Medium <span class="hlt">noise</span>: 67-77 dB, and High <span class="hlt">noise</span>: 72-80 dB). We measured reading comprehension and mathematical skills in accordance with the national guidelines for elementary education, using a test designed specifically for the purpose of this study. On the one hand, children in low-<span class="hlt">level</span> <span class="hlt">noise</span> schools showed statistically significant differences from children in medium- and high-<span class="hlt">level</span> <span class="hlt">noise</span> schools in reading performance (p<0.001). On the other hand, children in low-<span class="hlt">level</span> <span class="hlt">noise</span> schools differed significantly from children in high-<span class="hlt">level</span> <span class="hlt">noise</span> schools but only in mathematics performance (p=0.001). Girls in general did better in reading score than boys, especially in schools with medium- and high-<span class="hlt">level</span> <span class="hlt">noise</span>. Finally the <span class="hlt">levels</span> of <span class="hlt">noise</span> and gender were found to be two independent factors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Scraping&id=ED017129','ERIC'); return false;" href="http://eric.ed.gov/?q=Scraping&id=ED017129"><span>HOW TO KEEP SCHOOL <span class="hlt">NOISE</span> AT THE RIGHT <span class="hlt">LEVEL</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>MCKAY, RONALD L.</p> <p></p> <p>DISCUSSES FACTORS TO BE CONSIDERED DURING SCHOOL PLANNING STAGES REGARDING <span class="hlt">NOISE</span> <span class="hlt">LEVELS</span> AND ACOUSTIC DESIGN IMPLICATIONS. FACTORS ARE--(1) A STAGE HOUSE IS DETRIMENTAL TO ORCHESTRAS, BANDS, CHORUSES, LECTURES, ASSEMBLIES, RECITALS, AND CERTAIN DRAMAS AND SPEECH-MUSIC PERFORMANCES. SUGGESTED IS AN AUDITORIUM WITH AUDIENCE AND PERFORMING PLATFORM…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19960047313','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19960047313"><span>Validation of Aircraft <span class="hlt">Noise</span> Models at Lower <span class="hlt">Levels</span> of Exposure</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Page, Juliet A.; Plotkin, Kenneth J.; Carey, Jeffrey N.; Bradley, Kevin A.</p> <p>1996-01-01</p> <p><span class="hlt">Noise</span> <span class="hlt">levels</span> around airports and airbases in the United States arc computed via the FAA's Integrated <span class="hlt">Noise</span> Model (INM) or the Air Force's NOISEMAP (NMAP) program. These models were originally developed for use in the vicinity of airports, at distances which encompass a day night average sound <span class="hlt">level</span> in decibels (Ldn) of 65 dB or higher. There is increasing interest in aircraft <span class="hlt">noise</span> at larger distances from the airport. including en-route <span class="hlt">noise</span>. To evaluate the applicability of INM and NMAP at larger distances, a measurement program was conducted at a major air carrier airport with monitoring sites located in areas exposed to an Ldn of 55 dB and higher. Automated Radar Terminal System (ARTS) radar tracking data were obtained to provide actual flight parameters and positive identification of aircraft. Flight operations were grouped according to aircraft type. stage length, straight versus curved flight tracks, and arrival versus departure. Sound exposure <span class="hlt">levels</span> (SEL) were computed at monitoring locations, using the INM, and compared with measured values. While individual overflight SEL data was characterized by a high variance, analysis performed on an energy-averaging basis indicates that INM and similar models can be applied to regions exposed to an Ldn of 55 dB with no loss of reliability.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22087938','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22087938"><span>Effects of <span class="hlt">noise</span> <span class="hlt">levels</span> and call types on the source <span class="hlt">levels</span> of killer whale calls.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Holt, Marla M; Noren, Dawn P; Emmons, Candice K</p> <p>2011-11-01</p> <p>Accurate parameter estimates relevant to the vocal behavior of marine mammals are needed to assess potential effects of anthropogenic sound exposure including how masking <span class="hlt">noise</span> reduces the active space of sounds used for communication. Information about how these animals modify their vocal behavior in response to <span class="hlt">noise</span> exposure is also needed for such assessment. Prior studies have reported variations in the source <span class="hlt">levels</span> of killer whale sounds, and a more recent study reported that killer whales compensate for vessel masking <span class="hlt">noise</span> by increasing their call amplitude. The objectives of the current study were to investigate the source <span class="hlt">levels</span> of a variety of call types in southern resident killer whales while also considering background <span class="hlt">noise</span> <span class="hlt">level</span> as a likely factor related to call source <span class="hlt">level</span> variability. The source <span class="hlt">levels</span> of 763 discrete calls along with corresponding background <span class="hlt">noise</span> were measured over three summer field seasons in the waters surrounding the San Juan Islands, WA. Both <span class="hlt">noise</span> <span class="hlt">level</span> and call type were significant factors on call source <span class="hlt">levels</span> (1-40 kHz band, range of 135.0-175.7 dB(rms) re 1 [micro sign]Pa at 1 m). These factors should be considered in models that predict how anthropogenic masking <span class="hlt">noise</span> reduces vocal communication space in marine mammals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011JSMTE..11..021V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011JSMTE..11..021V"><span>Analysis of fractional Gaussian <span class="hlt">noises</span> using <span class="hlt">level</span> crossing method</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vahabi, M.; Jafari, G. R.; Sadegh Movahed, M.</p> <p>2011-11-01</p> <p>The so-called <span class="hlt">level</span> crossing analysis has been used to investigate the empirical data set, but there is a lack of interpretation for what is reflected by the <span class="hlt">level</span> crossing results. The fractional Gaussian <span class="hlt">noise</span> as a well-defined stochastic series could be a suitable benchmark to make more sense of the <span class="hlt">level</span> crossing findings. In this paper, we calculated the average frequency of upcrossing for a wide range of fractional Gaussian <span class="hlt">noises</span> from logarithmic (zero Hurst exponent, H = 0), to Gaussian, H = 1 (0 < H < 1). By introducing the relative change of the total number of upcrossings for original data with respect to the so-called shuffled data, {R} , an empirical function for the Hurst exponent versus {R} has been established. Finally to make the concept more obvious, we applied this approach to some financial series.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26093410','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26093410"><span>Urban <span class="hlt">noise</span> functional stratification for estimating average annual sound <span class="hlt">level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rey Gozalo, Guillermo; Barrigón Morillas, Juan Miguel; Prieto Gajardo, Carlos</p> <p>2015-06-01</p> <p>Road traffic <span class="hlt">noise</span> causes many health problems and the deterioration of the quality of urban life; thus, adequate spatial <span class="hlt">noise</span> and temporal assessment methods are required. Different methods have been proposed for the spatial evaluation of <span class="hlt">noise</span> in cities, including the categorization method. Until now, this method has only been applied for the study of spatial variability with measurements taken over a week. In this work, continuous measurements of 1 year carried out in 21 different locations in Madrid (Spain), which has more than three million inhabitants, were analyzed. The annual average sound <span class="hlt">levels</span> and the temporal variability were studied in the proposed categories. The results show that the three proposed categories highlight the spatial <span class="hlt">noise</span> stratification of the studied city in each period of the day (day, evening, and night) and in the overall indicators (L(And), L(Aden), and L(A24)). Also, significant differences between the diurnal and nocturnal sound <span class="hlt">levels</span> show functional stratification in these categories. Therefore, this functional stratification offers advantages from both spatial and temporal perspectives by reducing the sampling points and the measurement time.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol2/pdf/CFR-2012-title14-vol2-sec91-859.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol2/pdf/CFR-2012-title14-vol2-sec91-859.pdf"><span>14 CFR 91.859 - Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-01-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">levels</span>. 91.859 Section 91.859 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... <span class="hlt">Noise</span> Limits § 91.859 Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>. For an airplane subject to... Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title33-vol2/pdf/CFR-2011-title33-vol2-sec149-697.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title33-vol2/pdf/CFR-2011-title33-vol2-sec149-697.pdf"><span>33 CFR 149.697 - What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey?</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-07-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">level</span> survey? 149.697 Section 149.697 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... and Equipment <span class="hlt">Noise</span> Limits § 149.697 What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey? (a) A survey to determine the maximum <span class="hlt">noise</span> <span class="hlt">level</span> during normal operations must be conducted in each...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title33-vol2/pdf/CFR-2012-title33-vol2-sec149-697.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title33-vol2/pdf/CFR-2012-title33-vol2-sec149-697.pdf"><span>33 CFR 149.697 - What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey?</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-07-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">level</span> survey? 149.697 Section 149.697 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... and Equipment <span class="hlt">Noise</span> Limits § 149.697 What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey? (a) A survey to determine the maximum <span class="hlt">noise</span> <span class="hlt">level</span> during normal operations must be conducted in each...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title14-vol2/pdf/CFR-2013-title14-vol2-sec91-859.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title14-vol2/pdf/CFR-2013-title14-vol2-sec91-859.pdf"><span>14 CFR 91.859 - Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-01-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">levels</span>. 91.859 Section 91.859 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... <span class="hlt">Noise</span> Limits § 91.859 Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>. For an airplane subject to... Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title14-vol2/pdf/CFR-2010-title14-vol2-sec91-859.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title14-vol2/pdf/CFR-2010-title14-vol2-sec91-859.pdf"><span>14 CFR 91.859 - Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-01-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">levels</span>. 91.859 Section 91.859 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... <span class="hlt">Noise</span> Limits § 91.859 Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>. For an airplane subject to... Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol2/pdf/CFR-2014-title14-vol2-sec91-859.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol2/pdf/CFR-2014-title14-vol2-sec91-859.pdf"><span>14 CFR 91.859 - Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-01-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">levels</span>. 91.859 Section 91.859 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... <span class="hlt">Noise</span> Limits § 91.859 Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>. For an airplane subject to... Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title33-vol2/pdf/CFR-2013-title33-vol2-sec149-697.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title33-vol2/pdf/CFR-2013-title33-vol2-sec149-697.pdf"><span>33 CFR 149.697 - What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey?</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-07-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">level</span> survey? 149.697 Section 149.697 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... and Equipment <span class="hlt">Noise</span> Limits § 149.697 What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey? (a) A survey to determine the maximum <span class="hlt">noise</span> <span class="hlt">level</span> during normal operations must be conducted in each...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title49-vol5/pdf/CFR-2012-title49-vol5-sec393-94.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title49-vol5/pdf/CFR-2012-title49-vol5-sec393-94.pdf"><span>49 CFR 393.94 - Interior <span class="hlt">noise</span> <span class="hlt">levels</span> in power units.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 49 Transportation 5 2012-10-01 2012-10-01 false Interior <span class="hlt">noise</span> <span class="hlt">levels</span> in power units. 393.94... <span class="hlt">noise</span> <span class="hlt">levels</span> in power units. (a) Applicability of this section. The interior <span class="hlt">noise</span> <span class="hlt">level</span> requirements..., if the reading has not been influenced by extraneous <span class="hlt">noise</span> sources such as motor vehicles...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title33-vol2/pdf/CFR-2014-title33-vol2-sec149-697.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title33-vol2/pdf/CFR-2014-title33-vol2-sec149-697.pdf"><span>33 CFR 149.697 - What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey?</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-07-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">level</span> survey? 149.697 Section 149.697 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... and Equipment <span class="hlt">Noise</span> Limits § 149.697 What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey? (a) A survey to determine the maximum <span class="hlt">noise</span> <span class="hlt">level</span> during normal operations must be conducted in each...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title49-vol5/pdf/CFR-2014-title49-vol5-sec393-94.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title49-vol5/pdf/CFR-2014-title49-vol5-sec393-94.pdf"><span>49 CFR 393.94 - Interior <span class="hlt">noise</span> <span class="hlt">levels</span> in power units.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 49 Transportation 5 2014-10-01 2014-10-01 false Interior <span class="hlt">noise</span> <span class="hlt">levels</span> in power units. 393.94... <span class="hlt">noise</span> <span class="hlt">levels</span> in power units. (a) Applicability of this section. The interior <span class="hlt">noise</span> <span class="hlt">level</span> requirements..., if the reading has not been influenced by extraneous <span class="hlt">noise</span> sources such as motor vehicles...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title14-vol2/pdf/CFR-2011-title14-vol2-sec91-859.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title14-vol2/pdf/CFR-2011-title14-vol2-sec91-859.pdf"><span>14 CFR 91.859 - Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-01-01</p> <p>... <span class="hlt">noise</span> <span class="hlt">levels</span>. 91.859 Section 91.859 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... <span class="hlt">Noise</span> Limits § 91.859 Modification to meet Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>. For an airplane subject to... Stage 3 or Stage 4 <span class="hlt">noise</span> <span class="hlt">levels</span>....</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_6 --> <div id="page_7" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="121"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19820045630&hterms=railway&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Drailway','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19820045630&hterms=railway&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Drailway"><span>Comparing the relationships between <span class="hlt">noise</span> <span class="hlt">level</span> and annoyance in different surveys - A railway <span class="hlt">noise</span> vs. aircraft and road traffic comparison</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fields, J. M.; Walker, J. G.</p> <p>1982-01-01</p> <p>Annoyance expressed in a railway <span class="hlt">noise</span> survey is compared with that from two road traffic and three aircraft surveys in order to determine whether responses to various types of environmental <span class="hlt">noise</span> are source-specific. Railway <span class="hlt">noise</span> is found to be less annoying than other <span class="hlt">noises</span> at any given high <span class="hlt">noise</span> <span class="hlt">level</span>. Railway <span class="hlt">noise</span> annoyance rises less rapidly with increasing <span class="hlt">noise</span> <span class="hlt">level</span>. At high <span class="hlt">levels</span>, this gap in reactions averages about 10 dB; it ranges from 4 dB to more than 20 dB. The methods used for comparing the surveys are examined. It is found that methodological uncertainties lead to imprecise comparisons and that different annoyance scales yield different estimates of intersurvey differences.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017NaPho..11...44X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017NaPho..11...44X"><span>Photonic microwave signals with zeptosecond-<span class="hlt">level</span> absolute timing <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xie, Xiaopeng; Bouchand, Romain; Nicolodi, Daniele; Giunta, Michele; Hänsel, Wolfgang; Lezius, Matthias; Joshi, Abhay; Datta, Shubhashish; Alexandre, Christophe; Lours, Michel; Tremblin, Pierre-Alain; Santarelli, Giorgio; Holzwarth, Ronald; Le Coq, Yann</p> <p>2017-01-01</p> <p>Photonic synthesis of radiofrequency (RF) waveforms revived the quest for unrivalled microwave purity because of its ability to convey the benefits of optics to the microwave world. In this work, we perform a high-fidelity transfer of frequency stability between an optical reference and a microwave signal via a low-<span class="hlt">noise</span> fibre-based frequency comb and cutting-edge photodetection techniques. We demonstrate the generation of the purest microwave signal with a fractional frequency stability below 6.5 × 10-16 at 1 s and a timing <span class="hlt">noise</span> floor below 41 zs Hz-1/2 (phase <span class="hlt">noise</span> below -173 dBc Hz-1 for a 12 GHz carrier). This outperforms existing sources and promises a new era for state-of-the-art microwave generation. The characterization is achieved through a heterodyne cross-correlation scheme with the lowermost detection <span class="hlt">noise</span>. This unprecedented <span class="hlt">level</span> of purity can impact domains such as radar systems, telecommunications and time-frequency metrology. The measurement methods developed here can benefit the characterization of a broad range of signals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/6707800','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/6707800"><span>Radiation threshold <span class="hlt">levels</span> for <span class="hlt">noise</span> degradation of photodiodes. Technical report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Aukerman, L.W.; Vernon, F.L.; Song, Y.</p> <p>1986-09-30</p> <p>Space radiation can increase the <span class="hlt">noise</span> of photodiodes as a result of either a sustained ionizing-dose-rate effect or displacement damage. Elementary, straightforward models are presented for calculating radiation threshold <span class="hlt">levels</span> and rad hit susceptibility. Radiation-effects experiments that verify these models are discussed. Calculations for room-temperature silicon p-i-n photodetectors, an avalanche photodiode, and a hypothetical cooled staring detector indicate that this damage mechanism should not be ignored for space and nuclear environments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1990PhDT.......134K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1990PhDT.......134K"><span>Pitch Estimation, Voicing Decision, and <span class="hlt">Noise</span> Spectrum Estimation for Speech Corrupted by High <span class="hlt">Levels</span> of Additive <span class="hlt">Noise</span>.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Krubsack, David Allan</p> <p>1990-01-01</p> <p>This dissertation presents two algorithms that extract parameters which are important to speech processing in high <span class="hlt">levels</span> of <span class="hlt">noise</span>. The first algorithm determines whether a signal containing <span class="hlt">noise</span> corrupted human speech is voiced or not and estimates the fundamental frequency (pitch) of voiced speech. The second algorithm produces an estimate of the additive <span class="hlt">noise</span> which is corrupting the speech. Previous research related to the voicing decision and pitch estimation has been concentrated at signal-to -<span class="hlt">noise</span> ratios (SNRs) above 0 dB. Consequently, speech processing requiring the extraction of these parameters in higher <span class="hlt">levels</span> of <span class="hlt">noise</span> could not be performed with much success. The research presented in this dissertation concentrates on SNRs around and below 0 dB. Although the algorithm, based on the autocorrelation function, is designed to work well for high <span class="hlt">levels</span> of <span class="hlt">noise</span>, good results for the no <span class="hlt">noise</span> case have been maintained. The idea of a confidence measure for parameter estimation is introduced. Confidence measures are defined and developed for both the voicing decision and the pitch estimation algorithms. Estimation of <span class="hlt">noise</span> that is corrupting a speech signal has been motivated by the need to enhance the corrupted speech. Previous research has concentrated on speech which is band limited to about 3500 Hz. Therefore, the estimation of the <span class="hlt">noise</span> corrupting high frequency speech had not been considered. The <span class="hlt">noise</span> estimation algorithm presented in this dissertation considers the effects of high frequency speech on the <span class="hlt">noise</span> estimate in addition to the effects of low frequency speech. A new spectral averaging method is introduced which significantly reduces the corrupting effect of the speech components on the <span class="hlt">noise</span> estimate for SNRs above 0 dB. The algorithm is tested for stationary white <span class="hlt">noise</span>, stationary non-white <span class="hlt">noise</span>, and non-stationary white <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26411830','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26411830"><span>Creating a Culture of Safety by Reducing <span class="hlt">Noise</span> <span class="hlt">Levels</span> in the OR.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hogan, Lisa J; Harvey, Renee L</p> <p>2015-10-01</p> <p>We implemented a quality improvement project to reduce <span class="hlt">noise</span> <span class="hlt">levels</span> in the OR in response to complaints from the anesthesia staff members at two community hospitals. Excessive <span class="hlt">noise</span> has been shown to increase staff member stress, fatigue, distraction, and ineffective communication, which can lead to medical errors. We measured <span class="hlt">noise</span> <span class="hlt">levels</span> during anesthesia induction and emergence for 118 different surgical procedures and compared <span class="hlt">noise</span> <span class="hlt">levels</span> before and after the improvement project intervention. Staff member education and <span class="hlt">noise</span> reduction strategies, which included signage, prominent <span class="hlt">noise</span> meters, and specific suggestions to staff members, helped to significantly reduce the <span class="hlt">noise</span> <span class="hlt">level</span> during the anesthetic induction and emergence phases of OR procedures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19860012833','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19860012833"><span>Airport-<span class="hlt">Noise</span> <span class="hlt">Levels</span> and Annoyance Model (ALAMO) user's guide</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Deloach, R.; Donaldson, J. L.; Johnson, M. J.</p> <p>1986-01-01</p> <p>A guide for the use of the Airport-<span class="hlt">Noise</span> <span class="hlt">Level</span> and Annoyance MOdel (ALAMO) at the Langley Research Center computer complex is provided. This document is divided into 5 primary sections, the introduction, the purpose of the model, and an in-depth description of the following subsystems: baseline, <span class="hlt">noise</span> reduction simulation and track analysis. For each subsystem, the user is provided with a description of architecture, an explanation of subsystem use, sample results, and a case runner's check list. It is assumed that the user is familiar with the operations at the Langley Research Center (LaRC) computer complex, the Network Operating System (NOS 1.4) and CYBER Control Language. Incorporated within the ALAMO model is a census database system called SITE II.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22724316','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22724316"><span>Minimum requirement of artificial <span class="hlt">noise</span> <span class="hlt">level</span> for using <span class="hlt">noise</span>-assisted correlation algorithm to suppress artifacts in ultrasonic Nakagami images.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tsui, Po-Hsiang</p> <p>2012-04-01</p> <p>The Nakagami image is a complementary imaging mode for pulse-echo ultrasound B-scan to characterize tissues. White <span class="hlt">noise</span> in anechoic areas induces artifacts in the Nakagami image. Recently, we proposed a <span class="hlt">noise</span>-assisted correlation algorithm (NCA) for suppressing the Nakagami artifact. In the NCA, artificial white <span class="hlt">noise</span> is intentionally added twice to backscattered signals to produce two noisy data, which are used to establish a correlation profile for rejecting <span class="hlt">noise</span>. This study explored the effects of artificial <span class="hlt">noise</span> <span class="hlt">level</span> on the NCA to suppress the artifact of the Nakagami image. Simulations were conducted to produce B-mode images of anechoic regions under signal-to-<span class="hlt">noise</span> ratios (SNRs) of 20, 10 and 5 dB. Various artificial <span class="hlt">noise</span> <span class="hlt">levels</span> ranging from 0.1- to 1-fold of the intrinsic <span class="hlt">noise</span> amplitude were used in the NCA for constructing the Nakagami images. Phantom experiments were conducted to validate the performance of using the optimal artificial <span class="hlt">noise</span> <span class="hlt">level</span> suggested by the simulation results to suppress the Nakagami artifacts by the NCA. The simulation results indicated that the artifacts of the Nakagami image in the anechoic regions can be gradually suppressed by increasing the artificial <span class="hlt">noise</span> <span class="hlt">level</span> used in the NCA to improve the image contrast-to-<span class="hlt">noise</span> ratio (CNR). The CNR of the Nakagami image reached 20 dB when the artificial <span class="hlt">noise</span> <span class="hlt">level</span> was 0.7-fold of the intrinsic <span class="hlt">noise</span> amplitude. This criterion was demonstrated by the phantom results to provide the NCA with an excellent ability to obtain artifact-free Nakagami images.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19900015542','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19900015542"><span>En route <span class="hlt">noise</span> of turboprop aircraft and their <span class="hlt">acceptability</span>: Report of tests</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Held, Wolf</p> <p>1990-01-01</p> <p>The development of propfan-powered aircraft has been observed with great interest. It is obvious that during cruising flight, the aircraft powerplant (propellers) cause a <span class="hlt">noise</span> clearly perceivable on the ground. It is the audible frequency spectrum of the propfan powerplants relative to the high tip speeds that presents the problem. A flight test was conducted on 30 April, 1989 at the Frankfurt Airport. Results of the test flight are present.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007EnMan..39..301S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007EnMan..39..301S"><span>Defining <span class="hlt">Acceptable</span> <span class="hlt">Levels</span> for Ecological Indicators: An Approach for Considering Social Values</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Smyth, Robyn L.; Watzin, Mary C.; Manning, Robert E.</p> <p>2007-03-01</p> <p>Ecological indicators can facilitate an adaptive management approach, but only if <span class="hlt">acceptable</span> <span class="hlt">levels</span> for those indicators have been defined so that the data collected can be interpreted. Because <span class="hlt">acceptable</span> <span class="hlt">levels</span> are an expression of the desired state of the ecosystem, the process of establishing <span class="hlt">acceptable</span> <span class="hlt">levels</span> should incorporate not just ecological understanding but also societal values. The goal of this research was to explore an approach for defining <span class="hlt">acceptable</span> <span class="hlt">levels</span> of ecological indicators that explicitly considers social perspectives and values. We used a set of eight indicators that were related to issues of concern in the Lake Champlain Basin. Our approach was based on normative theory. Using a stakeholder survey, we measured respondent normative evaluations of varying <span class="hlt">levels</span> of our indicators. Aggregated social norm curves were used to determine the <span class="hlt">level</span> at which indicator values shifted from <span class="hlt">acceptable</span> to unacceptable conditions. For seven of the eight indicators, clear preferences were interpretable from these norm curves. For example, closures of public beaches because of bacterial contamination and days of intense algae bloom went from <span class="hlt">acceptable</span> to unacceptable at 7-10 days in a summer season. Survey respondents also indicated that the number of fish caught from Lake Champlain that could be safely consumed each month was unacceptably low and the number of streams draining into the lake that were impaired by storm water was unacceptably high. If indicators that translate ecological conditions into social consequences are carefully selected, we believe the normative approach has considerable merit for defining <span class="hlt">acceptable</span> <span class="hlt">levels</span> of valued ecological system components.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-1139.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-1139.pdf"><span>42 CFR 84.1139 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 42 Public Health 1 2010-10-01 2010-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... Efficiency Respirators and Combination Gas Masks § 84.1139 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-202.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-202.pdf"><span>42 CFR 84.202 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 42 Public Health 1 2011-10-01 2011-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Chemical Cartridge Respirators § 84.202 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-140.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-140.pdf"><span>42 CFR 84.140 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 42 Public Health 1 2014-10-01 2014-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Supplied-Air Respirators § 84.140 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-1139.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-1139.pdf"><span>42 CFR 84.1139 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 42 Public Health 1 2013-10-01 2013-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... Efficiency Respirators and Combination Gas Masks § 84.1139 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-1139.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-1139.pdf"><span>42 CFR 84.1139 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 42 Public Health 1 2014-10-01 2014-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... Efficiency Respirators and Combination Gas Masks § 84.1139 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-202.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-202.pdf"><span>42 CFR 84.202 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 42 Public Health 1 2012-10-01 2012-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Chemical Cartridge Respirators § 84.202 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-140.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-140.pdf"><span>42 CFR 84.140 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 42 Public Health 1 2013-10-01 2013-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Supplied-Air Respirators § 84.140 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-202.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title42-vol1/pdf/CFR-2013-title42-vol1-sec84-202.pdf"><span>42 CFR 84.202 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 42 Public Health 1 2013-10-01 2013-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Chemical Cartridge Respirators § 84.202 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-1139.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-1139.pdf"><span>42 CFR 84.1139 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 42 Public Health 1 2011-10-01 2011-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... Efficiency Respirators and Combination Gas Masks § 84.1139 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-140.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-140.pdf"><span>42 CFR 84.140 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 42 Public Health 1 2010-10-01 2010-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Supplied-Air Respirators § 84.140 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-202.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title42-vol1/pdf/CFR-2010-title42-vol1-sec84-202.pdf"><span>42 CFR 84.202 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 42 Public Health 1 2010-10-01 2010-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Chemical Cartridge Respirators § 84.202 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_7 --> <div id="page_8" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="141"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-140.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title42-vol1/pdf/CFR-2011-title42-vol1-sec84-140.pdf"><span>42 CFR 84.140 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 42 Public Health 1 2011-10-01 2011-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Supplied-Air Respirators § 84.140 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-202.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title42-vol1/pdf/CFR-2014-title42-vol1-sec84-202.pdf"><span>42 CFR 84.202 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 42 Public Health 1 2014-10-01 2014-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Chemical Cartridge Respirators § 84.202 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-140.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-140.pdf"><span>42 CFR 84.140 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 42 Public Health 1 2012-10-01 2012-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... PROTECTIVE DEVICES Supplied-Air Respirators § 84.140 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-1139.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title42-vol1/pdf/CFR-2012-title42-vol1-sec84-1139.pdf"><span>42 CFR 84.1139 - Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 42 Public Health 1 2012-10-01 2012-10-01 false Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets... Efficiency Respirators and Combination Gas Masks § 84.1139 Air velocity and <span class="hlt">noise</span> <span class="hlt">levels</span>; hoods and helmets; minimum requirements. <span class="hlt">Noise</span> <span class="hlt">levels</span> generated by the respirator will be measured inside the hood or...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/1111270','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/1111270"><span>Study of some parameters affecting <span class="hlt">noise</span> <span class="hlt">level</span> in textile spinning and weaving mills.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>el-Dakhakhny, A A; Noweir, M H; Kamel, N R</p> <p>1975-01-01</p> <p><span class="hlt">Noise</span> was evaluated in six spinning and five weaving halls located in three textile mills in Egypt. Spindle speed (rpm) and loom speed (picks per minutes) were found to be important parameters affecting the <span class="hlt">noise</span> <span class="hlt">level</span> in these mills. Reduction of the number of spinning machines to five spindles per square meter of floor area will probably bring the <span class="hlt">noise</span> <span class="hlt">level</span> below the TLV. In the weaving departments, the decrease in the number of looms will not effectively reduce the <span class="hlt">noise</span> <span class="hlt">level</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhyA..419..659Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhyA..419..659Z"><span>Optimising threshold <span class="hlt">levels</span> for information transmission in binary threshold networks: Independent multiplicative <span class="hlt">noise</span> on each threshold</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Bingchang; McDonnell, Mark D.</p> <p>2015-02-01</p> <p>The problem of optimising the threshold <span class="hlt">levels</span> in multilevel threshold system subject to multiplicative Gaussian and uniform <span class="hlt">noise</span> is considered. Similar to previous results for additive <span class="hlt">noise</span>, we find a bifurcation phenomenon in the optimal threshold values, as the <span class="hlt">noise</span> intensity changes. This occurs when the number of threshold units is greater than one. We also study the optimal thresholds for combined additive and multiplicative Gaussian <span class="hlt">noise</span>, and find that all threshold <span class="hlt">levels</span> need to be identical to optimise the system when the additive <span class="hlt">noise</span> intensity is a constant. However, this identical value is not equal to the signal mean, unlike the case of additive <span class="hlt">noise</span>. When the multiplicative <span class="hlt">noise</span> intensity is instead held constant, the optimal threshold <span class="hlt">levels</span> are not all identical for small additive <span class="hlt">noise</span> intensity but are all equal to zero for large additive <span class="hlt">noise</span> intensity. The model and our results are potentially relevant for sensor network design and understanding neurobiological sensory neurons such as in the peripheral auditory system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4630666','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4630666"><span><span class="hlt">Acceptance</span> and Avoidance Processes at Different <span class="hlt">Levels</span> of Psychological Recovery from Enduring Mental Illness</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Siqueira, Vinicius R.; Oades, Lindsay G.</p> <p>2015-01-01</p> <p>Objective. This study examined the use of psychological <span class="hlt">acceptance</span> and experiential avoidance, two key concepts of <span class="hlt">Acceptance</span> and Commitment Therapy (ACT), in the psychological recovery process of people with enduring mental illness. Method. Sixty-seven participants were recruited from the metropolitan, regional, and rural areas of New South Wales, Australia. They all presented some form of chronic mental illness (at least 12 months) as reflected in DSM-IV Axis I diagnostic criteria. The <span class="hlt">Acceptance</span> and Action Questionnaire (AAQ-19) was used to measure the presence of psychological <span class="hlt">acceptance</span> and experiential avoidance; the Recovery Assessment Scale (RAS) was used to examine the <span class="hlt">levels</span> of psychological recovery; and the Scales of Psychological Well-Being was used to observe if there are benefits in utilizing psychological <span class="hlt">acceptance</span> and experiential avoidance in the recovery process. Results. An analysis of objectively quantifiable measures found no clear correlation between the use of psychological <span class="hlt">acceptance</span> and recovery in mental illness as measured by the RAS. The data, however, showed a relationship between psychological <span class="hlt">acceptance</span> and some components of recovery, thereby demonstrating its possible value in the recovery process. Conclusion. The major contribution of this research was the emerging correlation that was observed between psychological <span class="hlt">acceptance</span> and positive <span class="hlt">levels</span> of psychological well-being among individuals with mental illness. PMID:26576412</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19880034970&hterms=routes+Administration&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Droutes%2BAdministration','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19880034970&hterms=routes+Administration&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Droutes%2BAdministration"><span>The prediction of en route <span class="hlt">noise</span> <span class="hlt">levels</span> for a DC-9 aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Weir, Donald S.</p> <p>1988-01-01</p> <p>En route <span class="hlt">noise</span> for advanced propfan powered aircraft has become an issue of concern for the Federal Aviation Administration. The NASA Aircraft <span class="hlt">Noise</span> Prediction Program (ANOPP) is used to demonstrate the source <span class="hlt">noise</span> and propagation effects for an aircraft in <span class="hlt">level</span> flight up to 35,000 feet altitude. One-third octave band spectra of the source <span class="hlt">noise</span>, atmospheric absorption loss, and received <span class="hlt">noise</span> are presented. The predicted maximum A-weighted sound pressure <span class="hlt">level</span> is compared to measured data from the Aeronautical Research Institute of Sweden. ANOPP is shown to be an effective tool in evaluating the en route <span class="hlt">noise</span> characteristics of a DC-9 aircraft.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/240894','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/240894"><span>Public <span class="hlt">acceptance</span> for centralized storage and repositories of low-<span class="hlt">level</span> waste session (Panel)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lutz, H.R.</p> <p>1995-12-31</p> <p>Participants from various parts of the world will provide a summary of their particular country`s approach to low-<span class="hlt">level</span> waste management and the cost of public <span class="hlt">acceptance</span> for low-<span class="hlt">level</span> waste management facilities. Participants will discuss the number, geographic location, and type of low-<span class="hlt">level</span> waste repositories and centralized storage facilities located in their countries. Each will discuss the amount, distribution, and duration of funds to gain public <span class="hlt">acceptance</span> of these facilities. Participants will provide an estimated $/meter for centralized storage facilities and repositories. The panel will include a brief discussion about the ethical aspects of public <span class="hlt">acceptance</span> costs, approaches for negotiating <span class="hlt">acceptance</span>, and lessons learned in each country. The audience is invited to participate in the discussion.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/22395787','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/22395787"><span>Anomalously high <span class="hlt">noise</span> <span class="hlt">levels</span> in a fibre Bragg grating semiconductor laser</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kurnosov, V D; Kurnosov, K V</p> <p>2015-01-31</p> <p>Taking into account gain nonlinearity allows one to obtain anomalously high <span class="hlt">noise</span> <span class="hlt">levels</span> in a fibre Bragg grating laser diode. This paper examines the effect of the gain nonlinearity due to spectral hole burning on <span class="hlt">noise</span> characteristics. (lasers)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MSSP...66..715N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MSSP...66..715N"><span>Potential of neuro-fuzzy methodology to estimate <span class="hlt">noise</span> <span class="hlt">level</span> of wind turbines</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nikolić, Vlastimir; Petković, Dalibor; Por, Lip Yee; Shamshirband, Shahaboddin; Zamani, Mazdak; Ćojbašić, Žarko; Motamedi, Shervin</p> <p>2016-01-01</p> <p>Wind turbines <span class="hlt">noise</span> effect became large problem because of increasing of wind farms numbers since renewable energy becomes the most influential energy sources. However, wind turbine <span class="hlt">noise</span> generation and propagation is not understandable in all aspects. Mechanical <span class="hlt">noise</span> of wind turbines can be ignored since aerodynamic <span class="hlt">noise</span> of wind turbine blades is the main source of the <span class="hlt">noise</span> generation. Numerical simulations of the <span class="hlt">noise</span> effects of the wind turbine can be very challenging task. Therefore in this article soft computing method is used to evaluate <span class="hlt">noise</span> <span class="hlt">level</span> of wind turbines. The main goal of the study is to estimate wind turbine <span class="hlt">noise</span> in regard of wind speed at different heights and for different sound frequency. Adaptive neuro-fuzzy inference system (ANFIS) is used to estimate the wind turbine <span class="hlt">noise</span> <span class="hlt">levels</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25994692','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25994692"><span>Community response to <span class="hlt">noise</span> in Vietnam: exposure-response relationships based on the community tolerance <span class="hlt">level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gjestland, Truls; Nguyen, Thu Lan; Yano, Takashi</p> <p>2015-05-01</p> <p>Social surveys on <span class="hlt">noise</span> annoyance have been conducted in five different cities in Vietnam. The surveys included both aircraft <span class="hlt">noise</span> (three airports) and road traffic <span class="hlt">noise</span> (five cities). The main objective for these studies was to establish dose-response functions that were representative for Vietnam. The results have been compared with results from similar surveys from other regions. Dose-response functions for aircraft <span class="hlt">noise</span> in Vietnam showing the percentage of highly annoyed people versus the <span class="hlt">noise</span> <span class="hlt">level</span> are nearly identical to those presented in the European <span class="hlt">Noise</span> Directive [European Commission (2002). http://ec.europa.eu/environment/<span class="hlt">noise</span>/directive.htm]. For road traffic <span class="hlt">noise</span>, however, the results indicate that people in Vietnam are more tolerant. The <span class="hlt">noise</span> <span class="hlt">levels</span> can be increased by 5-10 dB in order to have a response similar to the curve recommended by the European Commission.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26729143','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26729143"><span>Annoyance from Road Traffic, Trains, Airplanes and from Total Environmental <span class="hlt">Noise</span> <span class="hlt">Levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ragettli, Martina S; Goudreau, Sophie; Plante, Céline; Perron, Stéphane; Fournier, Michel; Smargiassi, Audrey</p> <p>2015-12-29</p> <p>There is a lack of studies assessing the exposure-response relationship between transportation <span class="hlt">noise</span> and annoyance in North America. Our aims were to investigate the prevalence of <span class="hlt">noise</span> annoyance induced by road traffic, trains and airplanes in relation to distance to transportation <span class="hlt">noise</span> sources, and to total environmental <span class="hlt">noise</span> <span class="hlt">levels</span> in Montreal, Canada; annoyance was assessed as <span class="hlt">noise</span>-induced disturbance. A telephone-based survey among 4336 persons aged >18 years was conducted. Exposure to total environmental <span class="hlt">noise</span> (A-weighted outdoor <span class="hlt">noise</span> <span class="hlt">levels</span>-LAeq24h and day-evening-night equivalent <span class="hlt">noise</span> <span class="hlt">levels</span>-Lden) for each study participant was determined using a statistical <span class="hlt">noise</span> model (land use regression-LUR) that is based on actual outdoor <span class="hlt">noise</span> measurements. The proportion of the population annoyed by road traffic, airplane and train <span class="hlt">noise</span> was 20.1%, 13.0% and 6.1%, respectively. As the distance to major roads, railways and the Montreal International Airport increased, the percentage of people disturbed and highly disturbed due to the corresponding traffic <span class="hlt">noise</span> significantly decreased. When applying the statistical <span class="hlt">noise</span> model we found a relationship between <span class="hlt">noise</span> <span class="hlt">levels</span> and disturbance from road traffic and total environmental <span class="hlt">noise</span>, with Prevalence Proportion Ratios (PPR) for highly disturbed people of 1.10 (95% CI: 1.07-1.13) and 1.04 (1.02-1.06) per 1 dB(A) Lden, respectively. Our study provides the first comprehensive information on the relationship between transportation <span class="hlt">noise</span> <span class="hlt">levels</span> and disturbance in a Canadian city. LUR models are still in development and further studies on transportation <span class="hlt">noise</span> induced annoyance are consequently needed, especially for sources other than road traffic.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4275629','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4275629"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> of dental equipment used in dental college of Damascus University</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Qsaibati, Mhd. Loutify; Ibrahim, Ousama</p> <p>2014-01-01</p> <p>Background: In dental practical classes, the acoustic environment is characterized by high <span class="hlt">noise</span> <span class="hlt">levels</span> in relation to other teaching areas. The aims of this study were to measure <span class="hlt">noise</span> <span class="hlt">levels</span> produced during the different dental learning clinics, by equipments used in dental learning areas under different working conditions and by used and brand new handpieces under different working conditions. Materials and Methods: The <span class="hlt">noise</span> <span class="hlt">levels</span> were measured by using a <span class="hlt">noise</span> <span class="hlt">level</span> meter with a microphone, which was placed at a distance of 15 cm from a main <span class="hlt">noise</span> source in pre-clinical and clinical areas. In laboratories, the microphone was placed at a distance of 15 cm and another reading was taken 2 m away. <span class="hlt">Noise</span> <span class="hlt">levels</span> of dental learning clinics were measured by placing <span class="hlt">noise</span> <span class="hlt">level</span> meter at clinic center. The data were collected, tabulated and statistically analyzed using t-tests. Significance <span class="hlt">level</span> was set at 5%. Results: In dental clinics, the highest <span class="hlt">noise</span> was produced by micro motor handpiece while cutting on acrylic (92.2 dB) and lowest <span class="hlt">noise</span> (51.7 dB) was created by ultrasonic scaler without suction pump. The highest <span class="hlt">noise</span> in laboratories was caused by sandblaster (96 dB at a distance of 15 cm) and lowest <span class="hlt">noise</span> by stone trimmer when only turned on (61.8 dB at a distance of 2 m). There was significant differences in <span class="hlt">noise</span> <span class="hlt">levels</span> of the equipment's used in dental laboratories and dental learning clinics (P = 0.007). The highest <span class="hlt">noise</span> <span class="hlt">level</span> recorded in clinics was at pedodontic clinic (67.37 dB). Conclusions: <span class="hlt">Noise</span> <span class="hlt">levels</span> detected in this study were considered to be close to the limit of risk of hearing loss 85 dB. PMID:25540655</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26187519','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26187519"><span>[Equivalent continuous <span class="hlt">noise</span> <span class="hlt">level</span> in neonatal intensive care unit associated to burnout syndrome].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Garrido Galindo, A P; Camargo Caicedo, Y; Vélez-Pereira, A M</p> <p>2015-01-01</p> <p><span class="hlt">Noise</span> <span class="hlt">levels</span> in neonatal intensive care units allow the appearance of symptoms associated with burnout such as stress, irritability, fatigue and emotional instability on health care personnel. The aim of this study was to evaluate the equivalent continuous <span class="hlt">noise</span> <span class="hlt">levels</span> in the neonatal intensive care unit and compare the results with <span class="hlt">noise</span> <span class="hlt">levels</span> associated with the occurrence of burnout syndrome on the care team. Continuous sampling was conducted for 20 days using a type I sound <span class="hlt">level</span> meter on the unit. The maximum, the ninetieth percentile and the equivalent continuous <span class="hlt">noise</span> <span class="hlt">level</span> (Leq) values were recorded. <span class="hlt">Noise</span> <span class="hlt">level</span> is reported in the range of 51.4-77.6 decibels A (dBA) with an average of 64 dBA, 100.6 dBA maximum, and average background <span class="hlt">noise</span> from 57.9 dBA. <span class="hlt">Noise</span> <span class="hlt">levels</span> exceed the standards suggested for neonatal intensive care units, are close to maximum values referred for <span class="hlt">noise</span> exposure in the occupational standards and to <span class="hlt">noise</span> <span class="hlt">levels</span> associated with the onset of burnout; thus allowing to infer the probability of occurrence of high <span class="hlt">levels</span> of <span class="hlt">noise</span> present in the unit on the development of burnout in caregivers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/129600','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/129600"><span>[<span class="hlt">Noise</span> <span class="hlt">level</span> measurements of the air <span class="hlt">noise</span> during drilling and grinding on the fresh isolated temporal bone (author's transl)].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Paulsen, K; Vietor, K</p> <p>1975-10-01</p> <p>Aerial sound measurements with different drilling instruments were performed during dry running and preparations of the bone. Registered were the values of the small drilling instruments Sirona, Dentatus-Air, and Electro-Torque-Ritter. Also tested were the KaVo-Technique-machine, the Hall-machine, the Air-Orbit-turbine, and the Sirona-turbine. During dry running most of them already reached the allowed marginal value of <span class="hlt">noise</span> nuisance for the ear of 85 dB (A) at a distance of 35 cm. Only the Air-Orbit-machine showed a slightly lower value of 80 dB (A). The <span class="hlt">level</span> increases with the used handpieces. Normal handpieces 1:1 exert only a minimal influence, gear handpieces 2:1, however, markedly increase the <span class="hlt">level</span>. The verticity is of no importance in the range of normal rotations between 10,000 r/min. and 80,000 r/min. Only rotations in the lower frequency range of 2,000 r/min. markedly decrease the <span class="hlt">noise</span> <span class="hlt">level</span>. During bone drilling, the kind and size of the drilling bit have an influence on the intensity of the <span class="hlt">noise</span> <span class="hlt">level</span>. Quadruple wing milling cutters create a very high <span class="hlt">noise</span> <span class="hlt">level</span> (at a distance of 15 cm still above 110 dB [A!]), big rose cutters (R 16) create <span class="hlt">noise</span> <span class="hlt">levels</span> of 95 dB (A) and above, and only diamond round bits create less <span class="hlt">noise</span> (approximately 88 db [A]). Small drilling bits make such a faint <span class="hlt">noise</span>, that it is overroared by the drilling instrument. The turbines create only slightly higher <span class="hlt">levels</span> than during dry running. Larger drilling bits cannot be employed here on principle. Wing milling cutters can lead to persistent damages of the inner ear. The frequent use of dental drilling instruments for bone preparations can also lead to a hearing loss of the operator in the long run.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/5668422','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/5668422"><span>Comparative carcinogenicity of the PAHs as a basis for <span class="hlt">acceptable</span> exposure <span class="hlt">levels</span> (AELs) in drinking water</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rugen, P.J.; Stern, C.D.; Lamm, S.H. )</p> <p>1989-06-01</p> <p>The carcinogenicity of various polynuclear aromatic hydrocarbons (PAHs) has generally been demonstrated by their ability to act as complete carcinogens in the development of cancers in rodent skin tests. In order to develop proposed <span class="hlt">acceptable</span> concentration <span class="hlt">levels</span> for various PAHs in drinking water, we reviewed the studies that formed the basis for determining that these specific PAHs were carcinogenic in animals. We found that the relative potency of these PAHs varied over a range of many orders of magnitude. For example, the carcinogenic strength of benz(a)anthracene (BaA) is found to be about 1/2000th that of benzo(a)pyrene (BaP). We have used the calculated carcinogenic potency of the various PAHs relative to that of BaP as a means for proposing specific <span class="hlt">acceptable</span> concentration <span class="hlt">levels</span> in drinking water for each of the specific PAHs. BaP is the only carcinogenic PAH for which EPA has published an <span class="hlt">acceptable</span> concentration <span class="hlt">level</span> based on carcinogenicity. Based on the <span class="hlt">level</span> EPA set for BaP (0.028 micrograms/liter), this methodology has provided for the specific PAHs a determination of proposed <span class="hlt">acceptable</span> concentration <span class="hlt">levels</span> quantitatively based on the same data that were used to qualitatively determine them to be animal carcinogens. We have proposed <span class="hlt">acceptable</span> concentration <span class="hlt">levels</span> for the carcinogenic PAHs in drinking water that range from 0.03 micrograms/liter for BaP to 6.5 micrograms/liter for BaA. We recommend that <span class="hlt">acceptable</span> concentration <span class="hlt">levels</span> for the various PAHs be based on their relative carcinogenic potencies rather than the EPA method of using the potency of only one specific PAH, BaP, to serve as the exposure <span class="hlt">level</span> determinant for all PAHs. We further suggest that this methodology may be applicable to other classes of carcinogenic compounds.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3917637','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3917637"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> in a dental teaching institute - A matter of concern!</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Singh, Simarpreet; Singh, Gurminder; Sharma, Sumit; Kaur, Amarinder</p> <p>2012-01-01</p> <p>Objective: To measure and assess the <span class="hlt">noise</span> <span class="hlt">levels</span> produced by various dental equipments in different areas of a dental institution and to recommend improvements if <span class="hlt">noise</span> <span class="hlt">levels</span> are not within permissible limits. Material and Methods: Sound <span class="hlt">levels</span> were measured at three different areas of a dental institution where learning and teaching activities are organized. The sound <span class="hlt">level</span> was measured using a sound <span class="hlt">level</span> meter known as ‘decibulolmeter’. In each area the <span class="hlt">noise</span> <span class="hlt">level</span> was assessed at two positions-one, at 6 inches from the operators ear and second, at the chairside instrument trolley. <span class="hlt">Noise</span> <span class="hlt">levels</span> were also assessed from a central location of the clinic area when multiple equipments were in operation simultaneously. Results: Dental laboratory machine, dental hand-piece, ultrasonic scalers, amalgamators, high speed evacuation, and other items produce <span class="hlt">noise</span> at different sound <span class="hlt">levels</span> which is appreciable. The <span class="hlt">noise</span> <span class="hlt">levels</span> generated varied between 72.6 dB in pre-clinics and 87.2 dB in prosthesis laboratory. The results are comparable to the results of other studies which are conducted elsewhere. Although the risk to the dentists is lesser, but damage to the hearing is possible over prolonged periods. Conclusion: Higher <span class="hlt">noise</span> <span class="hlt">levels</span> are potentially hazardous to the persons working in such environments especially in the laboratory areas where <span class="hlt">noise</span> <span class="hlt">levels</span> are exceeding the permissible limits. Key words:<span class="hlt">Noise</span> <span class="hlt">level</span>, equipment, hearing loss, risk, working areas. PMID:24558544</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22260128','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22260128"><span>Sensory <span class="hlt">acceptance</span> and survival of probiotic bacteria in ice cream produced with different overrun <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ferraz, Juliana L; Cruz, Adriano G; Cadena, Rafael S; Freitas, Monica Q; Pinto, Uelinton M; Carvalho, Celio C; Faria, Jose A F; Bolini, Helena M A</p> <p>2012-01-01</p> <p>The effect of different overrun <span class="hlt">levels</span> on the sensory <span class="hlt">acceptance</span> and survival of probiotic bacteria in ice cream was investigated. Vanilla ice creams supplemented with Lactobacillus acidophilus were processed with overruns of 45%, 60%, and 90%. Viable probiotic bacterial counts and sensory <span class="hlt">acceptance</span> were assessed. All the ice creams presented a minimum count of 6 log CFU/g at the end of 60 d of frozen storage. However, higher overrun <span class="hlt">levels</span> negatively influenced cell viability, being reported a decrease of 2 log CFU/g for the 90% overrun treatment. In addition, it was not reported an influence about <span class="hlt">acceptability</span> with respect to appearance, aroma, and taste of the ice creams (P > 0.05). Overall, the results suggest that lower overrun <span class="hlt">levels</span> should be adopted during the manufacture of ice cream in order to maintain its probiotic status through the shelf life.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/15169372','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/15169372"><span>Shot <span class="hlt">noise</span> spectrum of open dissipative quantum two-<span class="hlt">level</span> systems.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Aguado, Ramón; Brandes, Tobias</p> <p>2004-05-21</p> <p>We study the current <span class="hlt">noise</span> spectrum of qubits under transport conditions in a dissipative bosonic environment. We combine (non-)Markovian master equations with correlation functions in Laplace space to derive a <span class="hlt">noise</span> formula for both weak and strong coupling to the bath. The coherence-induced reduction of <span class="hlt">noise</span> is diminished by weak dissipation and/or a large <span class="hlt">level</span> separation (bias). For weak dissipation, we demonstrate that the dephasing and relaxation rates of the two-<span class="hlt">level</span> systems can be extracted from <span class="hlt">noise</span>. In the strong dissipation regime, the localization-delocalization transition becomes visible in the low-frequency <span class="hlt">noise</span>.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_8 --> <div id="page_9" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="161"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19534855','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19534855"><span>Performance of different types of hearing protectors undergoing high-<span class="hlt">level</span> impulse <span class="hlt">noise</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Buck, Karl</p> <p>2009-01-01</p> <p>The paper describes the problems that may occur when hearing protectors, usually designed for industrial <span class="hlt">noise</span> environments, are used for high-<span class="hlt">level</span> impulse (weapon) <span class="hlt">noise</span>. The military impulse <span class="hlt">noise</span> environment is described, as are the different types of passive and active hearing protectors and the measurement procedures. The different mechanisms that may alter the effectiveness of the hearing protectors as well as their global efficiency when submitted to high-<span class="hlt">level</span> impulse <span class="hlt">noise</span> are presented. The paper also discusses how the performance values accessible to the user may be used in different damage risk criteria for continuous and impulse <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/9473860','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/9473860"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> and hearing ability of female workers in a textile factory in Vietnam.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nguyen, A L; Nguyen, T C; Van, T L; Hoang, M H; Nguyen, S; Jonai, H; Villanueva, M B; Matsuda, S; Sotoyama, M; Sudo, A</p> <p>1998-01-01</p> <p><span class="hlt">Noise</span> and hearing ability profiles were determined in a textile factory in Vietnam. <span class="hlt">Noise</span> mapping done in the weaving section showed that the <span class="hlt">noise</span> <span class="hlt">levels</span> exceeded the Vietnamese standard of 90 dBA by as much as 9 dBA in some areas. Audiometric tests performed on 69 female workers from the weaving section revealed that workers with more than 10 years of <span class="hlt">noise</span> exposure had the worst hearing threshold <span class="hlt">levels</span> at 1,000 and 4,000 Hz. Similar findings were observed for workers greater than 35 years old. The 4,000 Hz notch, suggestive of exposure to intense <span class="hlt">noise</span>, was noted in the audiograms of 26 subjects.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016PhLA..380.1151S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016PhLA..380.1151S"><span>Estimating the <span class="hlt">level</span> of dynamical <span class="hlt">noise</span> in time series by using fractal dimensions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sase, Takumi; Ramírez, Jonatán Peña; Kitajo, Keiichi; Aihara, Kazuyuki; Hirata, Yoshito</p> <p>2016-03-01</p> <p>We present a method for estimating the dynamical <span class="hlt">noise</span> <span class="hlt">level</span> of a 'short' time series even if the dynamical system is unknown. The proposed method estimates the <span class="hlt">level</span> of dynamical <span class="hlt">noise</span> by calculating the fractal dimensions of the time series. Additionally, the method is applied to EEG data to demonstrate its possible effectiveness as an indicator of temporal changes in the <span class="hlt">level</span> of dynamical <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016IJAME..21..511I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016IJAME..21..511I"><span>Industrial <span class="hlt">noise</span> <span class="hlt">level</span> study in a wheat processing factory in ilorin, nigeria</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ibrahim, I.; Ajao, K. R.; Aremu, S. A.</p> <p>2016-05-01</p> <p>An industrial process such as wheat processing generates significant <span class="hlt">noise</span> which can cause adverse effects on workers and the general public. This study assessed the <span class="hlt">noise</span> <span class="hlt">level</span> at a wheat processing mill in Ilorin, Nigeria. A portable digital sound <span class="hlt">level</span> meter HD600 manufactured by Extech Inc., USA was used to determine the <span class="hlt">noise</span> <span class="hlt">level</span> around various machines, sections and offices in the factory at pre-determined distances. Subjective assessment was also mode using a World Health Organization (WHO) standard questionnaire to obtain information regarding <span class="hlt">noise</span> ratings, effect of <span class="hlt">noise</span> on personnel and <span class="hlt">noise</span> preventive measures. The result of the study shows that the highest <span class="hlt">noise</span> of 99.4 dBA was recorded at a pressure blower when compared to other machines. WHO Class-4 hearing protector is recommended for workers on the shop floor and room acoustics should be upgraded to absorb some sounds transmitted to offices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70026920','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70026920"><span>Ambient <span class="hlt">noise</span> <span class="hlt">levels</span> in the continental United States</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>McNamara, D.E.; Buland, R.P.</p> <p>2004-01-01</p> <p>The results of our <span class="hlt">noise</span> analysis are useful for characterizing the performance of existing broadband stations and for detecting operational problems and should be relevant to the future siting of ANSS backbone stations. The <span class="hlt">noise</span> maps at body-wave frequencies should be useful for estimating the magnitude threshold for the ANSS backbone and regional networks or conversely for optimizing the distribution of regional network stations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19740022127','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19740022127"><span><span class="hlt">Noise</span> generated by quiet engine fans. 2: Fan A. [measurement of power spectra and sideline perceived <span class="hlt">noise</span> <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Montegani, F. J.; Schaefer, J. W.; Stakolich, E. G.</p> <p>1974-01-01</p> <p>A significant effort within the NASA Quiet Engine Program has been devoted to acoustical evaluation at the Lewis Research Center <span class="hlt">noise</span> test facility of a family of full-scale fans. This report, documents the <span class="hlt">noise</span> results obtained with fan A - a 1.5-pressure-ratio, 1160-ft/sec-tip-speed fan. The fan is described and some aerodynamic operating data are given. Far-field <span class="hlt">noise</span> around the fan was measured for a variety of configurations pertaining to acoustical treatment and over a range of operating conditions. Complete results of 1/3-octave band analysis of the data are presented in tabular form. Included also are power spectra and sideline perceived <span class="hlt">noise</span> <span class="hlt">levels</span>. Some representative 1/3-octave band data are presented graphically, and sample graphs of continuous narrow-band spectra are also provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol1/pdf/CFR-2012-title14-vol1-sec36-1501.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol1/pdf/CFR-2012-title14-vol1-sec36-1501.pdf"><span>14 CFR 36.1501 - Procedures, <span class="hlt">noise</span> <span class="hlt">levels</span> and other information.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-01-01</p> <p>..., weights, configurations, and other information or data employed for obtaining the certified <span class="hlt">noise</span> <span class="hlt">levels</span> prescribed by this part, including equivalent procedures used for flight, testing, and analysis, must...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol1/pdf/CFR-2014-title14-vol1-sec36-1501.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol1/pdf/CFR-2014-title14-vol1-sec36-1501.pdf"><span>14 CFR 36.1501 - Procedures, <span class="hlt">noise</span> <span class="hlt">levels</span> and other information.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-01-01</p> <p>..., weights, configurations, and other information or data employed for obtaining the certified <span class="hlt">noise</span> <span class="hlt">levels</span> prescribed by this part, including equivalent procedures used for flight, testing, and analysis, must...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840010980','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840010980"><span>An empirical method for predicting the mixing <span class="hlt">noise</span> <span class="hlt">levels</span> of subsonic circular and coaxial jets</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Russell, J. W.</p> <p>1984-01-01</p> <p>An empirical method for predicting the static free field source <span class="hlt">noise</span> <span class="hlt">levels</span> of subsonic circular and coaxial jet flow streams is presented. The method was developed from an extensive data base of 817 jet tests obtained from five different government and industry sources in three nations. The prediction method defines the jet <span class="hlt">noise</span> in terms of four components which are overall power <span class="hlt">level</span>, power spectrum <span class="hlt">level</span>, directivity index, and relative spectrum <span class="hlt">level</span>. The values of these <span class="hlt">noise</span> <span class="hlt">level</span> components are defined on a grid consisting of seven frequency parameter values (Strouhal numbers) and seven directivity angles. The value of the <span class="hlt">noise</span> <span class="hlt">level</span> at each of these grid points is called a <span class="hlt">noise</span> <span class="hlt">level</span> coordinate and was defined as a function of five jet exhaust flow state parameters which are equivalent jet velocity, equivalent jet total temperature, the velocity ratio (outer stream to inner stream), temperature ratio, and area ratio. The functions were obtained by curve fitting in a least squares sense the <span class="hlt">noise</span> <span class="hlt">level</span> coordinates from the data base in a five dimensional flow state space using a third order Taylor series. The <span class="hlt">noise</span> <span class="hlt">level</span> coordinates define the component <span class="hlt">noise</span> <span class="hlt">levels</span> for all frequencies and directivities through a bicubic spline function.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=chess&id=EJ1002497','ERIC'); return false;" href="http://eric.ed.gov/?q=chess&id=EJ1002497"><span>Improving International-<span class="hlt">Level</span> Chess Players' Performance with an <span class="hlt">Acceptance</span>-Based Protocol: Preliminary Findings</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Ruiz, Francisco J.; Luciano, Carmen</p> <p>2012-01-01</p> <p>This study compared an individual, 4-hr intervention based on <span class="hlt">acceptance</span> and commitment therapy (ACT) versus a no-contact control condition in improving the performance of international-<span class="hlt">level</span> chess players. Five participants received the brief ACT protocol, with each matched to another chess player with similar characteristics in the control…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED568874.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED568874.pdf"><span>Social Problem-Solving Skills of Children in Terms of Maternal <span class="hlt">Acceptance</span>-Rejection <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Tepeli, Kezban; Yilmaz, Elif</p> <p>2013-01-01</p> <p>This study was conducted to find an answer to the question of "Do social problem-solving skills of 5-6 years old children differentiate depending on the <span class="hlt">levels</span> of maternal <span class="hlt">acceptance</span> rejection?" The participants of the study included 359 5-6 years old children and their mothers. Wally Social Problem-Solving Test and PARQ (Parental…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=dogs&pg=3&id=EJ796162','ERIC'); return false;" href="http://eric.ed.gov/?q=dogs&pg=3&id=EJ796162"><span><span class="hlt">Acceptance</span> of Dog Guides and Daily Stress <span class="hlt">Levels</span> of Dog Guide Users and Nonusers</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Matsunaka, Kumiko; Koda, Naoko</p> <p>2008-01-01</p> <p>The degree of <span class="hlt">acceptance</span> of dog guides at public facilities, which is required by law in Japan, was investigated, and evidence of rejection was found. Japanese people with visual impairments who used dog guides reported higher daily stress <span class="hlt">levels</span> than did those who did not use dog guides. (Contains 3 tables and 1 figure.)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5030705','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5030705"><span>Switching Correlation and <span class="hlt">Noise</span> <span class="hlt">Level</span> in Pr3+:YSO Crystal via Dressing Nonlinear Phase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ahmed, Irfan; Zhang, Zhaoyang; Wen, Feng; Zhang, Da; Li, Changbiao; Wang, Ruimin; Zhang, Yanpeng</p> <p>2016-01-01</p> <p>We propose and experimentally demonstrate that the intensity <span class="hlt">noise</span> correlation and the <span class="hlt">noise</span> <span class="hlt">level</span> of intensity-difference and intensity-sum in Stokes and anti-Stokes channel can be well controlled by the relative nonlinear phase in spontaneous parametric four-wave mixing process. By modulating the relative nonlinear phase, including self-phase modulation and cross-phase modulation, switching the correlation into anti-correlation and the relative intensity <span class="hlt">noise</span> <span class="hlt">level</span> between the intensity-difference and intensity-sum are realized. We also show that the variation tendencies of the relative intensity <span class="hlt">noise</span> <span class="hlt">level</span> and the corresponding intensity fluctuations correlation are in accordance with each other. PMID:27650423</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27650423','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27650423"><span>Switching Correlation and <span class="hlt">Noise</span> <span class="hlt">Level</span> in Pr(3+):YSO Crystal via Dressing Nonlinear Phase.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ahmed, Irfan; Zhang, Zhaoyang; Wen, Feng; Zhang, Da; Li, Changbiao; Wang, Ruimin; Zhang, Yanpeng</p> <p>2016-09-21</p> <p>We propose and experimentally demonstrate that the intensity <span class="hlt">noise</span> correlation and the <span class="hlt">noise</span> <span class="hlt">level</span> of intensity-difference and intensity-sum in Stokes and anti-Stokes channel can be well controlled by the relative nonlinear phase in spontaneous parametric four-wave mixing process. By modulating the relative nonlinear phase, including self-phase modulation and cross-phase modulation, switching the correlation into anti-correlation and the relative intensity <span class="hlt">noise</span> <span class="hlt">level</span> between the intensity-difference and intensity-sum are realized. We also show that the variation tendencies of the relative intensity <span class="hlt">noise</span> <span class="hlt">level</span> and the corresponding intensity fluctuations correlation are in accordance with each other.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870014729','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870014729"><span>Guidelines for <span class="hlt">noise</span> and vibration <span class="hlt">levels</span> for the space station</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1987-01-01</p> <p>Human habitability <span class="hlt">noise</span> and vibration guidelines for the Space Station are presented. These were developed by a working group of experts established by the Committee on Hearing, Bioacoustics, and Biomechanics (CHABA) of the National Research Council's Commission on Behavioral and Social Science and Education. <span class="hlt">Noise</span> exposure limits are suggested that will permit adequate speech communication, sleep, and hearing safety. Vibration exposure limits are suggested which will provide adequate comfort and permit adequate task performance. These are provided for guidance only for setting criteria. The exact criteria will depend on Space Station design and duty cycles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24080075','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24080075"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> in primary schools of medium sized city in Greece.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sarantopoulos, George; Lykoudis, Spyros; Kassomenos, Pavlos</p> <p>2014-06-01</p> <p>This study presents and evaluates <span class="hlt">noise</span> <span class="hlt">levels</span> recorded at 15 school complexes in order to describe the indoor as well as the outdoor acoustic environment of schools and gain insight on controlling factors. <span class="hlt">Noise</span> <span class="hlt">levels</span> at the roadside in front of the school, the schoolyard, and 41 classrooms, both occupied and unoccupied, were simultaneously and continuously recorded through the course of a daily timetable (08:20-13:10). The average speech <span class="hlt">noise</span> <span class="hlt">level</span> of teachers was separately measured for 1min periods. Indoor <span class="hlt">noise</span> <span class="hlt">levels</span>, in all cases, were much higher than internationally recommended values: LAeq,5min averaged 69.0dB in occupied classrooms, and 47.1dB in unoccupied ones. Average speech-to-<span class="hlt">noise</span> ratio (SNR) was estimated to be 12.0dB(A) during teaching, whereas both indoor and outdoor <span class="hlt">noise</span> <span class="hlt">levels</span> were significantly elevated during break time and outdoor physical-educational activities. Corresponding measurements of indoor and outdoor <span class="hlt">noise</span> suggest that <span class="hlt">noise</span> from the outside (road and schoolyard) affects the background <span class="hlt">noise</span> <span class="hlt">level</span> in the classrooms, however in varying degrees, depending on the specific layout and road traffic characteristics. Using double glazing diminishes this effect.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27529260','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27529260"><span>Sleep Disturbance from Road Traffic, Railways, Airplanes and from Total Environmental <span class="hlt">Noise</span> <span class="hlt">Levels</span> in Montreal.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Perron, Stéphane; Plante, Céline; Ragettli, Martina S; Kaiser, David J; Goudreau, Sophie; Smargiassi, Audrey</p> <p>2016-08-11</p> <p>The objective of our study was to measure the impact of transportation-related <span class="hlt">noise</span> and total environmental <span class="hlt">noise</span> on sleep disturbance for the residents of Montreal, Canada. A telephone-based survey on <span class="hlt">noise</span>-related sleep disturbance among 4336 persons aged 18 years and over was conducted. LNight for each study participant was estimated using a land use regression (LUR) model. Distance of the respondent's residence to the nearest transportation <span class="hlt">noise</span> source was also used as an indicator of <span class="hlt">noise</span> exposure. The proportion of the population whose sleep was disturbed by outdoor environmental <span class="hlt">noise</span> in the past 4 weeks was 12.4%. The proportion of those affected by road traffic, airplane and railway <span class="hlt">noise</span> was 4.2%, 1.5% and 1.1%, respectively. We observed an increased prevalence in sleep disturbance for those exposed to both rail and road <span class="hlt">noise</span> when compared for those exposed to road only. We did not observe an increased prevalence in sleep disturbance for those that were both exposed to road and planes when compared to those exposed to road or planes only. We developed regression models to assess the marginal proportion of sleep disturbance as a function of estimated LNight and distance to transportation <span class="hlt">noise</span> sources. In our models, sleep disturbance increased with proximity to transportation <span class="hlt">noise</span> sources (railway, airplane and road traffic) and with increasing LNight values. Our study provides a quantitative estimate of the association between total environmental <span class="hlt">noise</span> <span class="hlt">levels</span> estimated using an LUR model and sleep disturbance from transportation <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24349105','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24349105"><span>A <span class="hlt">noise</span> <span class="hlt">level</span> prediction method based on electro-mechanical frequency response function for capacitors.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhu, Lingyu; Ji, Shengchang; Shen, Qi; Liu, Yuan; Li, Jinyu; Liu, Hao</p> <p>2013-01-01</p> <p>The capacitors in high-voltage direct-current (HVDC) converter stations radiate a lot of audible <span class="hlt">noise</span> which can reach higher than 100 dB. The existing <span class="hlt">noise</span> <span class="hlt">level</span> prediction methods are not satisfying enough. In this paper, a new <span class="hlt">noise</span> <span class="hlt">level</span> prediction method is proposed based on a frequency response function considering both electrical and mechanical characteristics of capacitors. The electro-mechanical frequency response function (EMFRF) is defined as the frequency domain quotient of the vibration response and the squared capacitor voltage, and it is obtained from impulse current experiment. Under given excitations, the vibration response of the capacitor tank is the product of EMFRF and the square of the given capacitor voltage in frequency domain, and the radiated audible <span class="hlt">noise</span> is calculated by structure acoustic coupling formulas. The <span class="hlt">noise</span> <span class="hlt">level</span> under the same excitations is also measured in laboratory, and the results are compared with the prediction. The comparison proves that the <span class="hlt">noise</span> prediction method is effective.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10148030','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10148030"><span>WRAP low <span class="hlt">level</span> waste restricted waste management (LLW RWM) glovebox <span class="hlt">acceptance</span> test report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Leist, K.J.</p> <p>1997-11-24</p> <p>On April 22, 1997, the Low <span class="hlt">Level</span> Waste Restricted Waste Management (LLW RWM) glovebox was tested using <span class="hlt">acceptance</span> test procedure 13027A-87. Mr. Robert L. Warmenhoven served as test director, Mr. Kendrick Leist acted as test operator and test witness, and Michael Lane provided miscellaneous software support. The primary focus of the glovebox <span class="hlt">acceptance</span> test was to examine glovebox control system interlocks, operator Interface Unit (OIU) menus, alarms, and messages. Basic drum port and lift table control sequences were demonstrated. OIU menus, messages, and alarm sequences were examined, with few exceptions noted. Barcode testing was bypassed, due to the lack of installed equipment as well as the switch from basic reliance on fixed bar code readers to the enhanced use of portable bar code readers. Bar code testing was completed during performance of the LLW RWM OTP. Mechanical and control deficiencies were documented as Test Exceptions during performance of this <span class="hlt">Acceptance</span> Test. These items are attached as Appendix A to this report.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800019829','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800019829"><span>Analytical methodology for determination of helicopter IFR precision approach requirements. [pilot workload and <span class="hlt">acceptance</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Phatak, A. V.</p> <p>1980-01-01</p> <p>A systematic analytical approach to the determination of helicopter IFR precision approach requirements is formulated. The approach is based upon the hypothesis that pilot <span class="hlt">acceptance</span> <span class="hlt">level</span> or opinion rating of a given system is inversely related to the degree of pilot involvement in the control task. A nonlinear simulation of the helicopter approach to landing task incorporating appropriate models for UH-1H aircraft, the environmental disturbances and the human pilot was developed as a tool for evaluating the pilot <span class="hlt">acceptance</span> hypothesis. The simulated pilot model is generic in nature and includes analytical representation of the human information acquisition, processing, and control strategies. Simulation analyses in the flight director mode indicate that the pilot model used is reasonable. Results of the simulation are used to identify candidate pilot workload metrics and to test the well known performance-work-load relationship. A pilot <span class="hlt">acceptance</span> analytical methodology is formulated as a basis for further investigation, development and validation.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_9 --> <div id="page_10" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="181"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=aerobic+AND+exercise&pg=6&id=EJ808593','ERIC'); return false;" href="http://eric.ed.gov/?q=aerobic+AND+exercise&pg=6&id=EJ808593"><span><span class="hlt">Noise</span> <span class="hlt">Levels</span> during Aerobics and the Potential Effects on Distortion Product Otoacoustic Emissions</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Torre, Peter, III; Howell, Jennifer C.</p> <p>2008-01-01</p> <p>The purpose of this study was to measure <span class="hlt">noise</span> <span class="hlt">levels</span> during aerobics classes and to examine how outer hair cell (OHC) function, using distortion product otoacoustic emissions (DPOAEs), may be affected by this exposure. Fifty individuals (48 women and 2 men, ages 19-41 years) participated in 50-min aerobics classes. <span class="hlt">Noise</span> <span class="hlt">levels</span> were measured…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22444065','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22444065"><span>Some insights into the relationship between urban air pollution and <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kim, Ki-Hyun; Ho, Duy Xuan; Brown, Richard J C; Oh, J-M; Park, Chan Goo; Ryu, In Cheol</p> <p>2012-05-01</p> <p>The relationship between <span class="hlt">noise</span> and air pollution was investigated in eight different districts across Seoul, Korea, between September and November 2010. The <span class="hlt">noise</span> <span class="hlt">levels</span> in each district were measured at both roadside and non-roadside locations. It was found that the maximum <span class="hlt">levels</span> of <span class="hlt">noise</span> were generally at frequencies of around 1000 Hz. The equivalent <span class="hlt">noise</span> <span class="hlt">levels</span> (L(eq)), over all districts, averaged 61.4 ± 7.36 dB which is slightly lower than the <span class="hlt">noise</span> guidelines set by the World Health Organization (WHO) of 70 dB for industrial, commercial, traffic, and outdoor areas. Comparison of L(eq) <span class="hlt">levels</span> in each district consistently indicates that <span class="hlt">noise</span> <span class="hlt">levels</span> are higher at roadside sites than non-roadside sites. In addition the relative dominance of <span class="hlt">noise</span> during daytime as compared to nighttime was also apparent. Moreover, the results of an analysis relating sound <span class="hlt">levels</span> with air pollutant <span class="hlt">levels</span> indicate strongly that the correlation between these two parameters is the strongest at roadside sites (relative to non-roadside sites) and during nighttime (relative to daytime). The results of our data analysis point to a positive, but complex, correlation between <span class="hlt">noise</span> <span class="hlt">levels</span> and air pollution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=noise+AND+environment&id=EJ1047166','ERIC'); return false;" href="http://eric.ed.gov/?q=noise+AND+environment&id=EJ1047166"><span>Reduction of Classroom <span class="hlt">Noise</span> <span class="hlt">Levels</span> Using Group Contingencies</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Ring, Brandon M.; Sigurdsson, Sigurdur O.; Eubanks, Sean L.; Silverman, Kenneth</p> <p>2014-01-01</p> <p>The therapeutic workplace is an employment-based abstinence reinforcement intervention for unemployed drug users where trainees receive on-the-job employment skills training in a classroom setting. The study is an extension of prior therapeutic workplace research, which suggested that trainees frequently violated <span class="hlt">noise</span> standards. Participants…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26611053','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26611053"><span>Assessing the Underwater Ship <span class="hlt">Noise</span> <span class="hlt">Levels</span> in the North Tyrrhenian Sea.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rossi, Eduardo; Licitra, Gaetano; Iacoponi, Andrea; Taburni, Daniele</p> <p>2016-01-01</p> <p>The purpose of this research was to assess the anthropic underwater <span class="hlt">noise</span> caused by ships within the Cetacean Sanctuary, a wide area in the North Tyrrhenian Sea. <span class="hlt">Noise</span> from low-frequency continuous sounds has been investigated within the 1/3-octave bands centered at 63 and 125 Hz. All the information about <span class="hlt">noise</span> sources and sound attenuation have been organized in a database; a tool automatically extracts useful information from it and feeds a ray-tracing model to estimate <span class="hlt">noise</span> <span class="hlt">levels</span>. The results show average <span class="hlt">levels</span> generally over the 100 dB re 1 μPa value.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26356370','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26356370"><span>Effects of pedagogical ideology on the perceived loudness and <span class="hlt">noise</span> <span class="hlt">levels</span> in preschools.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jonsdottir, Valdis; Rantala, Leena M; Oskarsson, Gudmundur Kr; Sala, Eeva</p> <p>2015-01-01</p> <p>High activity <span class="hlt">noise</span> <span class="hlt">levels</span> that result in detrimental effects on speech communication have been measured in preschools. To find out if different pedagogical ideologies affect the perceived loudness and <span class="hlt">levels</span> of <span class="hlt">noise</span>, a questionnaire study inquiring about the experience of loudness and voice symptoms was carried out in Iceland in eight private preschools, called "Hjalli model", and in six public preschools. <span class="hlt">Noise</span> <span class="hlt">levels</span> were also measured in the preschools. Background variables (stress <span class="hlt">level</span>, age, length of working career, education, smoking, and number of children per teacher) were also analyzed in order to determine how much they contributed toward voice symptoms and the experience of noisiness. Results indicate that pedagogical ideology is a significant factor for predicting <span class="hlt">noise</span> and its consequences. Teachers in the preschool with tighter pedagogical control of discipline (the "Hjalli model") experienced lower activity <span class="hlt">noise</span> loudness than teachers in the preschool with a more relaxed control of behavior (public preschool). Lower <span class="hlt">noise</span> <span class="hlt">levels</span> were also measured in the "Hjalli model" preschool and fewer "Hjalli model" teachers reported voice symptoms. Public preschool teachers experienced more stress than "Hjalli model" teachers and the stress <span class="hlt">level</span> was, indeed, the background variable that best explained the voice symptoms and the teacher's perception of a noisy environment. Discipline, structure, and organization in the type of activity predicted the activity <span class="hlt">noise</span> <span class="hlt">level</span> better than the number of children in the group. Results indicate that pedagogical ideology is a significant factor for predicting self-reported <span class="hlt">noise</span> and its consequences.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19740020277&hterms=Deafness&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DDeafness','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19740020277&hterms=Deafness&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DDeafness"><span><span class="hlt">Level</span>, peculiarities and effects of coal mine <span class="hlt">noise</span> on pit workers. [correlation between <span class="hlt">noise</span> intensity and hearing impairment</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Darlea, I. G.; Bitir, P.; Coculescu, M.</p> <p>1974-01-01</p> <p>There exists a correlation between <span class="hlt">noise</span> intensity and spectrum and degree of hearing impairment in the different professional categories in the pit. Most affected are dross miners and drillers. In these, the first degree of hypoacusia sets in within the first five years of exposure. Deafness begins at a frequency of 4,000 Hz, but often enough (20%) at 2,000 Hz as well, progressively evolving through the classical stages if exposure to <span class="hlt">noise</span> continues. In the coal bearing basins investigated, the <span class="hlt">noise</span> <span class="hlt">level</span> is, on the whole, 31.2%, but the conventional zone is not involved by more than 6.3%. Technological and medical measures are proposed for the purpose of avoiding these troubles in the future.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1988JSV...127..431I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1988JSV...127..431I"><span>The plasma cyclic-AMP response to <span class="hlt">noise</span> in humans and rats—short-term exposure to various <span class="hlt">noise</span> <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Iwamoto, M.; Dodo, H.; Ishii, F.; Yoneda, J.; Yamazaki, S.; Goto, H.</p> <p>1988-12-01</p> <p>Rats were exposed to short-term <span class="hlt">noise</span> which was found to activate the hypothalamohypophyseal-adrenal system and result in a decrease of adrenal ascorbic acid (AAA) and an increase of serum corticosterone (SCS). The threshold limit value lay between 60 and 70 dB(A). To characterize better the effect of <span class="hlt">noise</span> on the human hypothalamo-hypophyseal-adrenal system, a large group of subjects was exposed to short-term <span class="hlt">noise</span> at 85 dB(A) and higher, and tested for <span class="hlt">levels</span> of adrenocortical steroid (cortisol) and anterior pituitary hormones such as ACTH, growth hormone (GH) and prolactin (PRL). Results in humans showed hyperfunction of the hypothalamo-pituitary system. However, as the responses in rats and humans differed, a further experiment was performed using C-AMP, a second messenger mediating many of the effects of a variety of hormones. Plasma C-AMP in humans and rats increased significantly after exposure to <span class="hlt">noise</span> greater than 70 dB(A). We suggest that plasma C-AMP could be useful as a sensitive index for <span class="hlt">noise</span>-related stress in the daily living environment of humans and rats.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19880014855','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19880014855"><span>Sources and <span class="hlt">levels</span> of background <span class="hlt">noise</span> in the NASA Ames 40- by 80-foot wind tunnel</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Soderman, Paul T.</p> <p>1988-01-01</p> <p>Background <span class="hlt">noise</span> <span class="hlt">levels</span> are measured in the NASA Ames Research Center 40- by 80-Foot Wind Tunnel following installation of a sound-absorbent lining on the test-section walls. Results show that the fan-drive <span class="hlt">noise</span> dominated the empty test-section background <span class="hlt">noise</span> at airspeeds below 120 knots. Above 120 knots, the test-section broadband background <span class="hlt">noise</span> was dominated by wind-induced dipole <span class="hlt">noise</span> (except at lower harmonics of fan blade-passage tones) most likely generated at the microphone or microphone support strut. Third-octave band and narrow-band spectra are presented for several fan operating conditions and test-section airspeeds. The background <span class="hlt">noise</span> <span class="hlt">levels</span> can be reduced by making improvements to the microphone wind screen or support strut. Empirical equations are presented relating variations of fan <span class="hlt">noise</span> with fan speed or blade-pitch angle. An empirical expression for typical fan <span class="hlt">noise</span> spectra is also presented. Fan motor electric power consumption is related to the <span class="hlt">noise</span> generation. Preliminary measurements of sound absorption by the test-section lining indicate that the 152 mm thick lining will adequately absorb test-section model <span class="hlt">noise</span> at frequencies above 300 Hz.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940007066','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940007066"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> and their effects on Shuttle crewmembers' performance: Operational concerns</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Koros, Anton S.; Adam, Susan C.; Wheelwright, Charles D.</p> <p>1993-01-01</p> <p>When excessive, <span class="hlt">noise</span> can result in sleep interference, fatigue, interference with verbal communication, and hearing damage. Shuttle crewmembers are exposed to <span class="hlt">noise</span> throughout their mission. The contribution of <span class="hlt">noise</span> to decrements in crew performance over these extended exposure durations was the focus of this study. On the STS-40/SLS-1, mission <span class="hlt">noise</span> <span class="hlt">levels</span> were evaluated through the use of a sound <span class="hlt">level</span> meter and a crew questionnaire. Crewmembers noted that sleep, concentration, and relaxation were negatively impacted by high <span class="hlt">noise</span> <span class="hlt">levels</span>. Speech Interference <span class="hlt">Levels</span> (SIL's), calculated from the sound <span class="hlt">level</span> measurements, suggested that crewmembers were required to raise their voice in order to be heard. No difficulty detecting caution and warning alarms was noted. The higher than desirable <span class="hlt">noise</span> <span class="hlt">levels</span> in Spacelab were attributed to flight specific payloads for which acoustic waivers were granted. It is recommended that current <span class="hlt">noise</span> <span class="hlt">levels</span> be reduced in Spacelab and the Orbiter Middeck especially as longer missions are planned for the buildup of Space Station Freedom. <span class="hlt">Levels</span> of NC 50 are recommended in areas where speech communication is required and NC 40 in sleep areas. These <span class="hlt">levels</span> are in accordance with the NASA Man-Systems Integration Standards. Measurements proposed for subsequent orbiter missions are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800005624','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800005624"><span>Effects of sound <span class="hlt">level</span> fluctuations on annoyance caused by aircraft-flyover <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Mccurdy, D. A.</p> <p>1979-01-01</p> <p>A laboratory experiment was conducted to determine the effects of variations in the rate and magnitude of sound <span class="hlt">level</span> fluctuations on the annoyance caused by aircraft-flyover <span class="hlt">noise</span>. The effects of tonal content, <span class="hlt">noise</span> duration, and sound pressure <span class="hlt">level</span> on annoyance were also studied. An aircraft-<span class="hlt">noise</span> synthesis system was used to synthesize 32 aircraft-flyover <span class="hlt">noise</span> stimuli representing the factorial combinations of 2 tone conditions, 2 <span class="hlt">noise</span> durations, 2 sound pressure <span class="hlt">levels</span>, 2 <span class="hlt">level</span> fluctuation rates, and 2 <span class="hlt">level</span> fluctuation magnitudes. Thirty-two test subjects made annoyance judgements on a total of 64 stimuli in a subjective listening test facility simulating an outdoor acoustic environment. Variations in the rate and magnitude of <span class="hlt">level</span> fluctuations were found to have little, if any, effect on annoyance. Tonal content, <span class="hlt">noise</span> duration, sound pressure <span class="hlt">level</span>, and the interaction of tonal content with sound pressure <span class="hlt">level</span> were found to affect the judged annoyance significantly. The addition of tone corrections and/or duration corrections significantly improved the annoyance prediction ability of <span class="hlt">noise</span> rating scales.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002ASAJ..112.2438M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002ASAJ..112.2438M"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> in the learning-teaching activities in a dental medicine school</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Matos, Andreia; Carvalho, Antonio P. O.; Fernandes, Joao C. S.</p> <p>2002-11-01</p> <p>The <span class="hlt">noise</span> <span class="hlt">levels</span> made by different clinical handpieces and laboratory engines are considered to be the main descriptors of acoustical comfort in learning spaces in a dental medicine school. Sound <span class="hlt">levels</span> were measured in five types of classrooms and teaching laboratories at the University of Porto Dental Medicine School. Handpiece <span class="hlt">noise</span> measurements were made while instruments were running free and during operations with cutting tools (tooth, metal, and acrylic). <span class="hlt">Noise</span> <span class="hlt">levels</span> were determined using a precision sound <span class="hlt">level</span> meter, which was positioned at ear <span class="hlt">level</span> and also at one-meter distance from the operator. Some of the handpieces were brand new and the others had a few years of use. The sound <span class="hlt">levels</span> encountered were between 60 and 99 dB(A) and were compared with the <span class="hlt">noise</span> limits in A-weighted sound pressure <span class="hlt">level</span> for mechanical equipments installed in educational buildings included in the Portuguese <span class="hlt">Noise</span> Code and in other European countries codes. The daily personal <span class="hlt">noise</span> exposure <span class="hlt">levels</span> (LEP,d) of the students and professors were calculated to be between 85 and 90 dB(A) and were compared with the European legal limits. Some <span class="hlt">noise</span> limits for this type of environment are proposed and suggestions for the improvement of the acoustical environment are given.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23008255','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23008255"><span>Additive white Gaussian <span class="hlt">noise</span> <span class="hlt">level</span> estimation in SVD domain for images.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, Wei; Lin, Weisi</p> <p>2013-03-01</p> <p>Accurate estimation of Gaussian <span class="hlt">noise</span> <span class="hlt">level</span> is of fundamental interest in a wide variety of vision and image processing applications as it is critical to the processing techniques that follow. In this paper, a new effective <span class="hlt">noise</span> <span class="hlt">level</span> estimation method is proposed on the basis of the study of singular values of <span class="hlt">noise</span>-corrupted images. Two novel aspects of this paper address the major challenges in <span class="hlt">noise</span> estimation: 1) the use of the tail of singular values for <span class="hlt">noise</span> estimation to alleviate the influence of the signal on the data basis for the <span class="hlt">noise</span> estimation process and 2) the addition of known <span class="hlt">noise</span> to estimate the content-dependent parameter, so that the proposed scheme is adaptive to visual signals, thereby enabling a wider application scope of the proposed scheme. The analysis and experiment results demonstrate that the proposed algorithm can reliably infer <span class="hlt">noise</span> <span class="hlt">levels</span> and show robust behavior over a wide range of visual content and <span class="hlt">noise</span> conditions, and that is outperforms relevant existing methods.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118.1910M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118.1910M"><span>Environmental <span class="hlt">noise</span> <span class="hlt">levels</span> affect the activity budget of the Florida manatee</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Miksis-Olds, Jennifer L.; Donaghay, Percy L.; Miller, James H.; Tyack, Peter L.</p> <p>2005-09-01</p> <p>Manatees inhabit coastal bays, lagoons, and estuaries because they are dependent on the aquatic vegetation that grows in shallow waters. Food requirements force manatees to occupy the same areas in which human activities are the greatest. <span class="hlt">Noise</span> produced from human activities has the potential to affect these animals by eliciting responses ranging from mild behavioral changes to extreme aversion. This study quantifies the behavioral responses of manatees to both changing <span class="hlt">levels</span> of ambient <span class="hlt">noise</span> and transient <span class="hlt">noise</span> sources. Results indicate that elevated environmental <span class="hlt">noise</span> <span class="hlt">levels</span> do affect the overall activity budget of this species. The proportion of time manatees spend feeding, milling, and traveling in critical habitats changed as a function of <span class="hlt">noise</span> <span class="hlt">level</span>. More time was spent in the directed, goal-oriented behaviors of feeding and traveling, while less time was spent milling when <span class="hlt">noise</span> <span class="hlt">levels</span> were highest. The animals also responded to the transient <span class="hlt">noise</span> of approaching vessels with changes in behavioral state and movements out of the geographical area. This suggests that manatees detect and respond to changes in environmental <span class="hlt">noise</span> <span class="hlt">levels</span>. Whether these changes legally constitute harassment and produce biologically significant effects need to be addressed with hypothesis-driven experiments and long-term monitoring. [For Animal Bioacoustics Best Student Paper Award.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19275337','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19275337"><span>Manatee (Trichechus manatus) vocalization usage in relation to environmental <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Miksis-Olds, Jennifer L; Tyack, Peter L</p> <p>2009-03-01</p> <p><span class="hlt">Noise</span> can interfere with acoustic communication by masking signals that contain biologically important information. Communication theory recognizes several ways a sender can modify its acoustic signal to compensate for <span class="hlt">noise</span>, including increasing the source <span class="hlt">level</span> of a signal, its repetition, its duration, shifting frequency outside that of the <span class="hlt">noise</span> band, or shifting the timing of signal emission outside of <span class="hlt">noise</span> periods. The extent to which animals would be expected to use these compensation mechanisms depends on the benefit of successful communication, risk of failure, and the cost of compensation. Here we study whether a coastal marine mammal, the manatee, can modify vocalizations as a function of behavioral context and ambient <span class="hlt">noise</span> <span class="hlt">level</span>. To investigate whether and how manatees modify their vocalizations, natural vocalization usage and structure were examined in terms of vocalization rate, duration, frequency, and source <span class="hlt">level</span>. Vocalizations were classified into two call types, chirps and squeaks, which were analyzed independently. In conditions of elevated <span class="hlt">noise</span> <span class="hlt">levels</span>, call rates decreased during feeding and social behaviors, and the duration of each call type was differently influenced by the presence of calves. These results suggest that ambient <span class="hlt">noise</span> <span class="hlt">levels</span> do have a detectable effect on manatee communication and that manatees modify their vocalizations as a function of <span class="hlt">noise</span> in specific behavioral contexts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA175977','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA175977"><span>Radiation Threshold <span class="hlt">Levels</span> for <span class="hlt">Noise</span> Degradation of Photodiodes.</span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>1986-09-30</p> <p>for <span class="hlt">Noise</span> Degradation of Photodiodes L. W. AUKERMAN , F. L. VERNON, Jr., and Y. SONG Electronics Research Laboratory Laboratory Operations The...PERFORMING ORG. REPORT NUMBER TR-0086 (6925-04)-2 7. AUTHOR(e) S. CONTRACT OR GRANT NUMBER(a) Lee W. Aukerman , Frank L. Vernon, Jr., and Yeong Song...Agency, Washington, D.C. (December 1971). 8. D. H. Seib and L. W. Aukerman , "Photodetectors for the 0.1 to 1.0 4m Spectral Region," Advances in</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5227017','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5227017"><span>Arterial Indices and Serum Cystatin C <span class="hlt">Level</span> in Individuals With Occupational Wide Band <span class="hlt">Noise</span> Exposure</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Khoshdel, Ali R.; Mousavi-Asl, Benyamin; Shekarchi, Babak; Amini, Kazem; Mirzaii-Dizgah, Iraj</p> <p>2016-01-01</p> <p>Background: Chronic exposure to <span class="hlt">noise</span> is known to cause a wide range of health problems including extracellular matrix (ECM) proliferation and involvement of cardiovascular system. There are a few studies to investigate <span class="hlt">noise</span>-induced vascular changes using noninvasive methods. In this study we used carotid artery intima-media thickness (CIMT) and aortic augmentation as indices of arterial properties and cystatin C as a serum biomarker relating to ECM metabolism. Materials and Methods: Ninety-three male participants were included in this study from aeronautic technicians: 39 with and 54 without a history of wide band <span class="hlt">noise</span> (WBN) exposure. For better discrimination, the participants were divided into the two age groups: <40 and >40 years old. Adjusted aortic augmentation index (AI) for a heart rate equal to 75 beats per minute (AIx@HR75) were calculated using pulse wave analysis (PWA). CIMT was measured in 54 participants who <span class="hlt">accepted</span> to undergo Doppler ultrasonography. Serum cystatin C was also measured. Results: Among younger individuals the mean CIMT was 0.85 ± 0.09 mm and 0.75 ± 0.22 mm in the in the exposed and the control groups respectively. Among older individuals CIMT had a mean of 1.04 ± 0.22 mm vs. 1.00 ± 0.25 mm for the exposed vs. the control group. However, in both age groups the difference was not significant at the 0.05 <span class="hlt">level</span>. A comparison of AIx@HR75 between exposure group and control group both in younger age group (5.46 ± 11.22 vs. 8.56 ± 8.66) and older age group (17.55 ± 10.07 vs. 16.61 ± 5.77) revealed no significant difference. We did not find any significant correlation between CIMT and AIx@HR75 in exposed group (r = 0.314, P value = 0.145) but the correlation was significant in control group (r = 0.455, P value = 0.019). Serum cystatin C <span class="hlt">level</span> was significantly lower in individuals with WBN exposure compared to controls (441.10 ± 104.70 ng/L vs. 616.89 ± 136.14, P value < 0.001) both in younger and older groups. Conclusion: We could</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18846431','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18846431"><span>A comparative study of <span class="hlt">noise</span> pollution <span class="hlt">levels</span> in some selected areas in Ilorin Metropolis, Nigeria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Oyedepo, Olayinka S; Saadu, Abdullahi A</p> <p>2009-11-01</p> <p>The <span class="hlt">noise</span> pollution is a major problem for the quality of life in urban areas. This study was conducted to compare the <span class="hlt">noise</span> pollution <span class="hlt">levels</span> at busy roads/road junctions, passengers loading parks, commercial, industrial and residential areas in Ilorin metropolis. A total number of 47-locations were selected within the metropolis. Statistical analysis shows significant difference (P < 0.05) in <span class="hlt">noise</span> pollution <span class="hlt">levels</span> between industrial areas and low density residential areas, industrial areas and high density areas, industrial areas and passengers loading parks, industrial areas and commercial areas, busy roads/road junctions and low density areas, passengers loading parks and commercial areas and commercial areas and low density areas. There is no significant difference (P > 0.05) in <span class="hlt">noise</span> pollution <span class="hlt">levels</span> between industrial areas and busy roads/road junctions, busy roads/road junctions and high density areas, busy roads/road junctions and passengers loading parks, busy roads/road junctions and commercial areas, passengers loading parks and high density areas, passengers loading parks and commercial areas and commercial areas and high density areas. The results show that Industrial areas have the highest <span class="hlt">noise</span> pollution <span class="hlt">levels</span> (110.2 dB(A)) followed by busy roads/Road junctions (91.5 dB(A)), Passengers loading parks (87.8 dB(A)) and Commercial areas (84.4 dB(A)). The <span class="hlt">noise</span> pollution <span class="hlt">levels</span> in Ilorin metropolis exceeded the recommended <span class="hlt">level</span> by WHO at 34 of 47 measuring points. It can be concluded that the city is environmentally <span class="hlt">noise</span> polluted and road traffic and industrial machineries are the major sources of it. Noting the <span class="hlt">noise</span> emission standards, technical control measures, planning and promoting the citizens awareness about the high <span class="hlt">noise</span> risk may help to relieve the <span class="hlt">noise</span> problem in the metropolis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000068518','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000068518"><span>Validation of Aircraft <span class="hlt">Noise</span> Prediction Models at Low <span class="hlt">Levels</span> of Exposure</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Page, Juliet A.; Hobbs, Christopher M.; Plotkin, Kenneth J.; Stusnick, Eric; Shepherd, Kevin P. (Technical Monitor)</p> <p>2000-01-01</p> <p>Aircraft <span class="hlt">noise</span> measurements were made at Denver International Airport for a period of four weeks. Detailed operational information was provided by airline operators which enabled <span class="hlt">noise</span> <span class="hlt">levels</span> to be predicted using the FAA's Integrated <span class="hlt">Noise</span> Model. Several thrust prediction techniques were evaluated. Measured sound exposure <span class="hlt">levels</span> for departure operations were found to be 4 to 10 dB higher than predicted, depending on the thrust prediction technique employed. Differences between measured and predicted <span class="hlt">levels</span> are shown to be related to atmospheric conditions present at the aircraft altitude.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4670443','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4670443"><span>Effects of voice style, <span class="hlt">noise</span> <span class="hlt">level</span>, and acoustic feedback on objective and subjective voice evaluations</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Bottalico, Pasquale; Graetzer, Simone; Hunter, Eric J.</p> <p>2015-01-01</p> <p>Speakers adjust their vocal effort when communicating in different room acoustic and <span class="hlt">noise</span> conditions and when instructed to speak at different volumes. The present paper reports on the effects of voice style, <span class="hlt">noise</span> <span class="hlt">level</span>, and acoustic feedback on vocal effort, evaluated as sound pressure <span class="hlt">level</span>, and self-reported vocal fatigue, comfort, and control. Speakers increased their <span class="hlt">level</span> in the presence of babble and when instructed to talk in a loud style, and lowered it when acoustic feedback was increased and when talking in a soft style. Self-reported responses indicated a preference for the normal style without babble <span class="hlt">noise</span>. PMID:26723357</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26780960','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26780960"><span>Preferred listening <span class="hlt">levels</span> of mobile phone programs when considering subway interior <span class="hlt">noise</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yu, Jyaehyoung; Lee, Donguk; Han, Woojae</p> <p>2016-01-01</p> <p>Today, people listen to music loud using personal listening devices. Although a majority of studies have reported that the high volume played on these listening devices produces a latent risk of hearing problems, there is a lack of studies on "double <span class="hlt">noise</span> exposures" such as environmental <span class="hlt">noise</span> plus recreational <span class="hlt">noise</span>. The present study measures the preferred listening <span class="hlt">levels</span> of a mobile phone program with subway interior <span class="hlt">noise</span> for 74 normal-hearing participants in five age groups (ranging from 20s to 60s). The speakers presented the subway interior <span class="hlt">noise</span> at 73.45 dB, while each subject listened to three application programs [Digital Multimedia Broadcasting (DMB), music, game] for 30 min using a tablet personal computer with an earphone. The participants' earphone volume <span class="hlt">levels</span> were analyzed using a sound <span class="hlt">level</span> meter and a 2cc coupler. Overall, the results showed that those in their 20s listened to the three programs significantly louder with DMB set at significantly higher volume <span class="hlt">levels</span> than for the other programs. Higher volume <span class="hlt">levels</span> were needed for middle frequency compared to the lower and higher frequencies. We concluded that any potential risk of <span class="hlt">noise</span>-induced hearing loss for mobile phone users should be communicated when users listen regularly, although the volume <span class="hlt">level</span> was not high enough that the users felt uncomfortable. When considering individual listening habits on mobile phones, further study to predict total accumulated environmental <span class="hlt">noise</span> is still needed.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4918671','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4918671"><span>Preferred listening <span class="hlt">levels</span> of mobile phone programs when considering subway interior <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Yu, Jyaehyoung; Lee, Donguk; Han, Woojae</p> <p>2016-01-01</p> <p>Today, people listen to music loud using personal listening devices. Although a majority of studies have reported that the high volume played on these listening devices produces a latent risk of hearing problems, there is a lack of studies on “double <span class="hlt">noise</span> exposures” such as environmental <span class="hlt">noise</span> plus recreational <span class="hlt">noise</span>. The present study measures the preferred listening <span class="hlt">levels</span> of a mobile phone program with subway interior <span class="hlt">noise</span> for 74 normal-hearing participants in five age groups (ranging from 20s to 60s). The speakers presented the subway interior <span class="hlt">noise</span> at 73.45 dB, while each subject listened to three application programs [Digital Multimedia Broadcasting (DMB), music, game] for 30 min using a tablet personal computer with an earphone. The participants’ earphone volume <span class="hlt">levels</span> were analyzed using a sound <span class="hlt">level</span> meter and a 2cc coupler. Overall, the results showed that those in their 20s listened to the three programs significantly louder with DMB set at significantly higher volume <span class="hlt">levels</span> than for the other programs. Higher volume <span class="hlt">levels</span> were needed for middle frequency compared to the lower and higher frequencies. We concluded that any potential risk of <span class="hlt">noise</span>-induced hearing loss for mobile phone users should be communicated when users listen regularly, although the volume <span class="hlt">level</span> was not high enough that the users felt uncomfortable. When considering individual listening habits on mobile phones, further study to predict total accumulated environmental <span class="hlt">noise</span> is still needed. PMID:26780960</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19820014927','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19820014927"><span>Measurement of speech <span class="hlt">levels</span> in the presence of time varying background <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Pearsons, K. S.; Horonjeff, R.</p> <p>1982-01-01</p> <p>Short-term speech <span class="hlt">level</span> measurements which could be used to note changes in vocal effort in a time varying <span class="hlt">noise</span> environment were studied. Knowing the changes in speech <span class="hlt">level</span> would in turn allow prediction of intelligibility in the presence of aircraft flyover <span class="hlt">noise</span>. Tests indicated that it is possible to use two second samples of speech to estimate long term root mean square speech <span class="hlt">levels</span>. Other tests were also performed in which people read out loud during aircraft flyover <span class="hlt">noise</span>. Results of these tests indicate that people do indeed raise their voice during flyovers at a rate of about 3-1/2 dB for each 10 dB increase in background <span class="hlt">level</span>. This finding is in agreement with other tests of speech <span class="hlt">levels</span> in the presence of steady state background <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26629916','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26629916"><span>The Relationship between Vessel Traffic and <span class="hlt">Noise</span> <span class="hlt">Levels</span> Received by Killer Whales (Orcinus orca).</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Houghton, Juliana; Holt, Marla M; Giles, Deborah A; Hanson, M Bradley; Emmons, Candice K; Hogan, Jeffrey T; Branch, Trevor A; VanBlaricom, Glenn R</p> <p>2015-01-01</p> <p>Whale watching has become increasingly popular as an ecotourism activity around the globe and is beneficial for environmental education and local economies. Southern Resident killer whales (Orcinus orca) comprise an endangered population that is frequently observed by a large whale watching fleet in the inland waters of Washington state and British Columbia. One of the factors identified as a risk to recovery for the population is the effect of vessels and associated <span class="hlt">noise</span>. An examination of the effects of vessels and associated <span class="hlt">noise</span> on whale behavior utilized novel equipment to address limitations of previous studies. Digital acoustic recording tags (DTAGs) measured the <span class="hlt">noise</span> <span class="hlt">levels</span> the tagged whales received while laser positioning systems allowed collection of geo-referenced data for tagged whales and all vessels within 1000 m of the tagged whale. The objective of the current study was to compare vessel data and DTAG recordings to relate vessel traffic to the ambient <span class="hlt">noise</span> received by tagged whales. Two analyses were conducted, one including all recording intervals, and one that excluded intervals when only the research vessel was present. For all data, significant predictors of <span class="hlt">noise</span> <span class="hlt">levels</span> were length (inverse relationship), number of propellers, and vessel speed, but only 15% of the variation in <span class="hlt">noise</span> was explained by this model. When research-vessel-only intervals were excluded, vessel speed was the only significant predictor of <span class="hlt">noise</span> <span class="hlt">levels</span>, and explained 42% of the variation. Simple linear regressions (ignoring covariates) found that average vessel speed and number of propellers were the only significant correlates with <span class="hlt">noise</span> <span class="hlt">levels</span>. We conclude that vessel speed is the most important predictor of <span class="hlt">noise</span> <span class="hlt">levels</span> received by whales in this study. Thus, measures that reduce vessel speed in the vicinity of killer whales would reduce <span class="hlt">noise</span> exposure in this population.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4667929','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4667929"><span>The Relationship between Vessel Traffic and <span class="hlt">Noise</span> <span class="hlt">Levels</span> Received by Killer Whales (Orcinus orca)</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Houghton, Juliana; Holt, Marla M.; Giles, Deborah A.; Hanson, M. Bradley; Emmons, Candice K.; Hogan, Jeffrey T.; Branch, Trevor A.; VanBlaricom, Glenn R.</p> <p>2015-01-01</p> <p>Whale watching has become increasingly popular as an ecotourism activity around the globe and is beneficial for environmental education and local economies. Southern Resident killer whales (Orcinus orca) comprise an endangered population that is frequently observed by a large whale watching fleet in the inland waters of Washington state and British Columbia. One of the factors identified as a risk to recovery for the population is the effect of vessels and associated <span class="hlt">noise</span>. An examination of the effects of vessels and associated <span class="hlt">noise</span> on whale behavior utilized novel equipment to address limitations of previous studies. Digital acoustic recording tags (DTAGs) measured the <span class="hlt">noise</span> <span class="hlt">levels</span> the tagged whales received while laser positioning systems allowed collection of geo-referenced data for tagged whales and all vessels within 1000 m of the tagged whale. The objective of the current study was to compare vessel data and DTAG recordings to relate vessel traffic to the ambient <span class="hlt">noise</span> received by tagged whales. Two analyses were conducted, one including all recording intervals, and one that excluded intervals when only the research vessel was present. For all data, significant predictors of <span class="hlt">noise</span> <span class="hlt">levels</span> were length (inverse relationship), number of propellers, and vessel speed, but only 15% of the variation in <span class="hlt">noise</span> was explained by this model. When research-vessel-only intervals were excluded, vessel speed was the only significant predictor of <span class="hlt">noise</span> <span class="hlt">levels</span>, and explained 42% of the variation. Simple linear regressions (ignoring covariates) found that average vessel speed and number of propellers were the only significant correlates with <span class="hlt">noise</span> <span class="hlt">levels</span>. We conclude that vessel speed is the most important predictor of <span class="hlt">noise</span> <span class="hlt">levels</span> received by whales in this study. Thus, measures that reduce vessel speed in the vicinity of killer whales would reduce <span class="hlt">noise</span> exposure in this population. PMID:26629916</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70173493','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70173493"><span>The relationship between vessel traffic and <span class="hlt">noise</span> <span class="hlt">levels</span> received by killer whales (Orcinus orca)</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Houghton, Juliana; Holt, Marla M.; Giles, Deborah A.; Hanson, M. Bradley; Emmons, Candice K.; Hogan, Jeffrey T.; Branch, Trevor A.; Vanblaricom, Glenn R.</p> <p>2015-01-01</p> <p>Whale watching has become increasingly popular as an ecotourism activity around the globe and is beneficial for environmental education and local economies. Southern Resident killer whales (Orcinus orca) comprise an endangered population that is frequently observed by a large whale watching fleet in the inland waters of Washington state and British Columbia. One of the factors identified as a risk to recovery for the population is the effect of vessels and associated <span class="hlt">noise</span>. An examination of the effects of vessels and associated <span class="hlt">noise</span> on whale behavior utilized novel equipment to address limitations of previous studies. Digital acoustic recording tags (DTAGs) measured the <span class="hlt">noise</span> <span class="hlt">levels</span> the tagged whales received while laser positioning systems allowed collection of geo-referenced data for tagged whales and all vessels within 1000 m of the tagged whale. The objective of the current study was to compare vessel data and DTAG recordings to relate vessel traffic to the ambient <span class="hlt">noise</span> received by tagged whales. Two analyses were conducted, one including all recording intervals, and one that excluded intervals when only the research vessel was present. For all data, significant predictors of <span class="hlt">noise</span> <span class="hlt">levels</span> were length (inverse relationship), number of propellers, and vessel speed, but only 15% of the variation in <span class="hlt">noise</span> was explained by this model. When research-vessel-only intervals were excluded, vessel speed was the only significant predictor of <span class="hlt">noise</span> <span class="hlt">levels</span>, and explained 42% of the variation. Simple linear regressions (ignoring covariates) found that average vessel speed and number of propellers were the only significant correlates with <span class="hlt">noise</span> <span class="hlt">levels</span>. We conclude that vessel speed is the most important predictor of <span class="hlt">noise</span> <span class="hlt">levels</span> received by whales in this study. Thus, measures that reduce vessel speed in the vicinity of killer whales would reduce <span class="hlt">noise</span> exposure in this population.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5227021','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5227021"><span>Modeling Signal-to-<span class="hlt">Noise</span> Ratio of Otoacoustic Emissions in Workers Exposed to Different Industrial <span class="hlt">Noise</span> <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Nassiri, Parvin; Zare, Sajad; Monazzam, Mohammad R.; Pourbakht, Akram; Azam, Kamal; Golmohammadi, Taghi</p> <p>2016-01-01</p> <p>Introduction: <span class="hlt">Noise</span> is considered as the most common cause of harmful physical effects in the workplace. A sound that is generated from within the inner ear is known as an otoacoustic emission (OAE). Distortion-product otoacoustic emissions (DPOAEs) assess evoked emission and hearing capacity. The aim of this study was to assess the signal-to-<span class="hlt">noise</span> ratio in different frequencies and at different times of the shift work in workers exposed to various <span class="hlt">levels</span> of <span class="hlt">noise</span>. It was also aimed to provide a statistical model for signal-to-<span class="hlt">noise</span> ratio (SNR) of OAEs in different frequencies based on the two variables of sound pressure <span class="hlt">level</span> (SPL) and exposure time. Materials and Methods: This case–control study was conducted on 45 workers during autumn 2014. The workers were divided into three groups based on the <span class="hlt">level</span> of <span class="hlt">noise</span> exposure. The SNR was measured in frequencies of 1000, 2000, 3000, 4000, and 6000 Hz in both ears, and in three different time intervals during the shift work. According to the inclusion criterion, SNR of 6 dB or greater was included in the study. The analysis was performed using repeated measurements of analysis of variance, spearman correlation coefficient, and paired samples t-test. Results: The results showed that there was no statistically significant difference between the three exposed groups in terms of the mean values of SNR (P > 0.05). Only in signal pressure <span class="hlt">levels</span> of 88 dBA with an interval time of 10:30–11:00 AM, there was a statistically significant difference between the right and left ears with the mean SNR values of 3000 frequency (P = 0.038). The SPL had a significant effect on the SNR in both the right and left ears (P = 0.023, P = 0.041). The effect of the duration of measurement on the SNR was statistically significant in both the right and left ears (P = 0.027, P < 0.001). Conclusion: The findings of this study demonstrated that after <span class="hlt">noise</span> exposure during the shift, SNR of OAEs reduced from the beginning to the end of the shift</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/827149','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/827149"><span>ENVIROCARE OF UTAH: EXPANDING WASTE <span class="hlt">ACCEPTANCE</span> CRITERIA TO PROVIDE LOW-<span class="hlt">LEVEL</span> AND MIXED WASTE DISPOSAL OPTIONS</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rogers, B.; Loveland, K.</p> <p>2003-02-27</p> <p>Envirocare of Utah operates a low-<span class="hlt">level</span> radioactive waste disposal facility 80 miles west of Salt Lake City in Clive, Utah. <span class="hlt">Accepted</span> waste types includes NORM, 11e2 byproduct material, Class A low-<span class="hlt">level</span> waste, and mixed waste. Since 1988, Envirocare has offered disposal options for environmental restoration waste for both government and commercial remediation projects. Annual waste receipts exceed 12 million cubic feet. The waste <span class="hlt">acceptance</span> criteria (WAC) for the Envirocare facility have significantly expanded to accommodate the changing needs of restoration projects and waste generators since its inception, including <span class="hlt">acceptable</span> physical waste forms, radiological <span class="hlt">acceptance</span> criteria, RCRA requirements and treatment capabilities, PCB <span class="hlt">acceptance</span>, and liquids <span class="hlt">acceptance</span>. Additionally, there are many packaging, transportation, and waste management options for waste streams <span class="hlt">acceptable</span> at Envirocare. Many subcontracting vehicles are also available to waste generators for both government and commercial activities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118.3154K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118.3154K"><span>Underwater temporary threshold shift in pinnipeds: Effects of <span class="hlt">noise</span> <span class="hlt">level</span> and duration</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kastak, David; Southall, Brandon L.; Schusterman, Ronald J.; Kastak, Colleen Reichmuth</p> <p>2005-11-01</p> <p>Behavioral psychophysical techniques were used to evaluate the residual effects of underwater <span class="hlt">noise</span> on the hearing sensitivity of three pinnipeds: a California sea lion (Zalophus californianus), a harbor seal (Phoca vitulina), and a northern elephant seal (Mirounga angustirostris). Temporary threshold shift (TTS), defined as the difference between auditory thresholds obtained before and after <span class="hlt">noise</span> exposure, was assessed. The subjects were exposed to octave-band <span class="hlt">noise</span> centered at 2500 Hz at two sound pressure <span class="hlt">levels</span>: 80 and 95 dB SL (re: auditory threshold at 2500 Hz). <span class="hlt">Noise</span> exposure durations were 22, 25, and 50 min. Threshold shifts were assessed at 2500 and 3530 Hz. Mean threshold shifts ranged from 2.9-12.2 dB. Full recovery of auditory sensitivity occurred within 24 h of <span class="hlt">noise</span> exposure. Control sequences, comprising sham <span class="hlt">noise</span> exposures, did not result in significant mean threshold shifts for any subject. Threshold shift magnitudes increased with increasing <span class="hlt">noise</span> sound exposure <span class="hlt">level</span> (SEL) for two of the three subjects. The results underscore the importance of including sound exposure metrics (incorporating sound pressure <span class="hlt">level</span> and exposure duration) in order to fully assess the effects of <span class="hlt">noise</span> on marine mammal hearing.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4476045','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4476045"><span>Harbour porpoises react to low <span class="hlt">levels</span> of high frequency vessel <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Dyndo, Monika; Wiśniewska, Danuta Maria; Rojano-Doñate, Laia; Madsen, Peter Teglberg</p> <p>2015-01-01</p> <p>Cetaceans rely critically on sound for navigation, foraging and communication and are therefore potentially affected by increasing <span class="hlt">noise</span> <span class="hlt">levels</span> from human activities at sea. Shipping is the main contributor of anthropogenic <span class="hlt">noise</span> underwater, but studies of shipping <span class="hlt">noise</span> effects have primarily considered baleen whales due to their good hearing at low frequencies, where ships produce most <span class="hlt">noise</span> power. Conversely, the possible effects of vessel <span class="hlt">noise</span> on small toothed whales have been largely ignored due to their poor low-frequency hearing. Prompted by recent findings of energy at medium- to high-frequencies in vessel <span class="hlt">noise</span>, we conducted an exposure study where the behaviour of four porpoises (Phocoena phocoena) in a net-pen was logged while they were exposed to 133 vessel passages. Using a multivariate generalised linear mixed-effects model, we show that low <span class="hlt">levels</span> of high frequency components in vessel <span class="hlt">noise</span> elicit strong, stereotyped behavioural responses in porpoises. Such low <span class="hlt">levels</span> will routinely be experienced by porpoises in the wild at ranges of more than 1000 meters from vessels, suggesting that vessel <span class="hlt">noise</span> is a, so far, largely overlooked, but substantial source of disturbance in shallow water areas with high densities of both porpoises and vessels. PMID:26095689</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NatSR...511083D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NatSR...511083D"><span>Harbour porpoises react to low <span class="hlt">levels</span> of high frequency vessel <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dyndo, Monika; Wiśniewska, Danuta Maria; Rojano-Doñate, Laia; Madsen, Peter Teglberg</p> <p>2015-06-01</p> <p>Cetaceans rely critically on sound for navigation, foraging and communication and are therefore potentially affected by increasing <span class="hlt">noise</span> <span class="hlt">levels</span> from human activities at sea. Shipping is the main contributor of anthropogenic <span class="hlt">noise</span> underwater, but studies of shipping <span class="hlt">noise</span> effects have primarily considered baleen whales due to their good hearing at low frequencies, where ships produce most <span class="hlt">noise</span> power. Conversely, the possible effects of vessel <span class="hlt">noise</span> on small toothed whales have been largely ignored due to their poor low-frequency hearing. Prompted by recent findings of energy at medium- to high-frequencies in vessel <span class="hlt">noise</span>, we conducted an exposure study where the behaviour of four porpoises (Phocoena phocoena) in a net-pen was logged while they were exposed to 133 vessel passages. Using a multivariate generalised linear mixed-effects model, we show that low <span class="hlt">levels</span> of high frequency components in vessel <span class="hlt">noise</span> elicit strong, stereotyped behavioural responses in porpoises. Such low <span class="hlt">levels</span> will routinely be experienced by porpoises in the wild at ranges of more than 1000 meters from vessels, suggesting that vessel <span class="hlt">noise</span> is a, so far, largely overlooked, but substantial source of disturbance in shallow water areas with high densities of both porpoises and vessels.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/16334695','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/16334695"><span>Underwater temporary threshold shift in pinnipeds: effects of <span class="hlt">noise</span> <span class="hlt">level</span> and duration.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kastak, David; Southall, Brandon L; Schusterman, Ronald J; Kastak, Colleen Reichmuth</p> <p>2005-11-01</p> <p>Behavioral psychophysical techniques were used to evaluate the residual effects of underwater <span class="hlt">noise</span> on the hearing sensitivity of three pinnipeds: a California sea lion (Zalophus californianus), a harbor seal (Phoca vitulina), and a northern elephant seal (Mirounga angustirostris). Temporary threshold shift (TTS), defined as the difference between auditory thresholds obtained before and after <span class="hlt">noise</span> exposure, was assessed. The subjects were exposed to octave-band <span class="hlt">noise</span> centered at 2500 Hz at two sound pressure <span class="hlt">levels</span>: 80 and 95 dB SL (re: auditory threshold at 2500 Hz). <span class="hlt">Noise</span> exposure durations were 22, 25, and 50 min. Threshold shifts were assessed at 2500 and 3530 Hz. Mean threshold shifts ranged from 2.9-12.2 dB. Full recovery of auditory sensitivity occurred within 24 h of <span class="hlt">noise</span> exposure. Control sequences, comprising sham <span class="hlt">noise</span> exposures, did not result in significant mean threshold shifts for any subject. Threshold shift magnitudes increased with increasing <span class="hlt">noise</span> sound exposure <span class="hlt">level</span> (SEL) for two of the three subjects. The results underscore the importance of including sound exposure metrics (incorporating sound pressure <span class="hlt">level</span> and exposure duration) in order to fully assess the effects of <span class="hlt">noise</span> on marine mammal hearing.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4918653','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4918653"><span>The impact of road traffic <span class="hlt">noise</span> on cognitive performance in attention-based tasks depends on <span class="hlt">noise</span> <span class="hlt">level</span> even within moderate-<span class="hlt">level</span> ranges</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Schlittmeier, Sabine J.; Feil, Alexandra; Liebl, Andreas; Hellbrück, Jürgen</p> <p>2015-01-01</p> <p>Little empirical evidence is available regarding the effects of road traffic <span class="hlt">noise</span> on cognitive performance in adults, although traffic <span class="hlt">noise</span> can be heard at many offices and home office workplaces. Our study tested the impact of road traffic <span class="hlt">noise</span> at different <span class="hlt">levels</span> (50 dB(A), 60 dB(A), 70 dB(A)) on performance in three tasks that differed with respect to their dependency on attentional and storage functions, as follows: The Stroop task, in which performance relied predominantly on attentional functions (e.g., inhibition of automated responses; Experiment 1: n = 24); a non-automated multistage mental arithmetic task calling for both attentional and storage functions (Exp. 2: n = 18); and verbal serial recall, which placed a burden predominantly on storage functions (Experiment 3: n = 18). Better performance was observed during moderate road traffic <span class="hlt">noise</span> at 50 dB(A) compared to loud traffic <span class="hlt">noise</span> at 70 dB(A) in attention-based tasks (Experiments 1-2). This contrasted with the effects of irrelevant speech (60 dB(A)), which was included in the experiments as a well-explored and common <span class="hlt">noise</span> source in office settings. A disturbance impact of background speech was only given in the two tasks that called for storage functions (Experiments 2-3). In addition to the performance data, subjective annoyance ratings were collected. Consistent with the <span class="hlt">level</span> effect of road traffic <span class="hlt">noise</span> found in the performance data, a moderate road traffic <span class="hlt">noise</span> at 50 dB(A) was perceived as significantly less annoying than a loud road traffic <span class="hlt">noise</span> at 70 dB(A), which was found, however, independently of the task at hand. Furthermore, the background sound condition with the highest detrimental performance effect in a task was also rated as most annoying in this task, i.e., traffic <span class="hlt">noise</span> at 70 dB(A) in the Stroop task, and background speech in the mental arithmetic and serial recall tasks. PMID:25913554</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23515634','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23515634"><span>Excessive <span class="hlt">noise</span> <span class="hlt">levels</span> are noted in kindergarten classrooms in the island of Crete.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chatzakis, Nikolaos S; Karatzanis, Alexander D; Helidoni, Meropi E; Velegrakis, Stelios G; Christodoulou, Panagiotis; Velegrakis, Georgios A</p> <p>2014-03-01</p> <p>Ambient <span class="hlt">noise</span> in classrooms may present a serious obstacle to the academic achievement of children. There is relatively little information on <span class="hlt">noise</span> <span class="hlt">levels</span> in teaching facilities in Greece and particularly in the island of Crete. The purpose of this study was to provide objective data on the internal <span class="hlt">noise</span> <span class="hlt">levels</span> inside kindergartens in Crete. The study was conducted in the city of Heraklion in the island of Crete, Greece. Ten kindergartens were selected and a total of 18 classrooms were chosen. <span class="hlt">Noise</span> <span class="hlt">levels</span> were measured in occupied and unoccupied classrooms. <span class="hlt">Noise</span> <span class="hlt">levels</span> in occupied classrooms ranged from 71.6 to 82.9 dBA with an average of 75.8 dBA. <span class="hlt">Noise</span> <span class="hlt">levels</span> in empty classrooms varied from 48.2 to 59.6 dBA with an average of 53.1 dBA. All values are well above international standards. Excessive classroom <span class="hlt">noise</span> seems to be very common in kindergartens. Results may indicate that school facilities are not built in compliance with international standards. School administrators and local authorities should become aware of the problem, and make any necessary interventions to improve the learning capabilities of children.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3641522','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3641522"><span>Relationship between container ship underwater <span class="hlt">noise</span> <span class="hlt">levels</span> and ship design, operational and oceanographic conditions</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>McKenna, Megan F.; Wiggins, Sean M.; Hildebrand, John A.</p> <p>2013-01-01</p> <p>Low-frequency ocean ambient <span class="hlt">noise</span> is dominated by <span class="hlt">noise</span> from commercial ships, yet understanding how individual ships contribute deserves further investigation. This study develops and evaluates statistical models of container ship <span class="hlt">noise</span> in relation to design characteristics, operational conditions, and oceanographic settings. Five-hundred ship passages and nineteen covariates were used to build generalized additive models. Opportunistic acoustic measurements of ships transiting offshore California were collected using seafloor acoustic recorders. A 5–10 dB range in broadband source <span class="hlt">level</span> was found for ships depending on the transit conditions. For a ship recorded multiple times traveling at different speeds, cumulative <span class="hlt">noise</span> was lowest at 8 knots, 65% reduction in operational speed. Models with highest predictive power, in order of selection, included ship speed, size, and time of year. Uncertainty in source depth and propagation affected model fit. These results provide insight on the conditions that produce higher <span class="hlt">levels</span> of underwater <span class="hlt">noise</span> from container ships.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25454773','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25454773"><span>Timing vocal behavior: lack of temporal overlap avoidance to fluctuating <span class="hlt">noise</span> <span class="hlt">levels</span> in singing Eurasian wrens.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yang, Xiao-Jing; Slabbekoorn, Hans</p> <p>2014-10-01</p> <p>Many animals live in or near urban areas that have become increasingly widespread and noisy over the last century. Especially those species that rely heavily on acoustics for communication may be affected by these elevated anthropogenic <span class="hlt">noise</span> <span class="hlt">levels</span>. Many bird species that sing to defend their territories and to attract mates may have to exploit specific <span class="hlt">noise</span> coping strategies to persist in such acoustically challenging conditions. Eurasian wrens (Troglodytes troglodytes), like several other bird species, have been shown in a previous experiment to time their vocalizations such that they avoid overlap with other singing birds. Here, we tested whether Eurasian wrens also time their songs to avoid overlap with fluctuating anthropogenic <span class="hlt">noise</span>. However, we did not find any evidence in favor of this potential phenomenon. Territorial wrens persisted in singing without temporal adjustments in noisy territories with 'natural' fluctuations of traffic <span class="hlt">noise</span> <span class="hlt">levels</span> as well as during experimental exposure to intermittent white <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24275001','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24275001"><span>Recent and long-term occupational <span class="hlt">noise</span> exposure and salivary cortisol <span class="hlt">level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Stokholm, Zara Ann; Hansen, Åse Marie; Grynderup, Matias Brødsgaard; Bonde, Jens Peter; Christensen, Kent Lodberg; Frederiksen, Thomas Winther; Lund, Søren Peter; Vestergaard, Jesper Medom; Kolstad, Henrik Albert</p> <p>2014-01-01</p> <p>Environmental and occupational <span class="hlt">noise</span> exposure have been related to increased risk of cardiovascular disease, hypothetically mediated by stress-activation of the hypothalamic-pituitary-adrenal (HPA) axis. The objective of this study was to investigate the relation between recent and long-term occupational <span class="hlt">noise</span> exposure and cortisol <span class="hlt">level</span> measured off work to assess a possible sustained HPA-axis effect. We included 501 industrial, finance, and service workers who were followed for 24h during work, leisure, and sleep. Ambient occupational <span class="hlt">noise</span> exposure <span class="hlt">levels</span> were recorded every 5s by personal dosimeters and we calculated the full-shift LAEq value and estimated duration and cumulative exposure based on their work histories since 1980. For 332 workers who kept a log-book on the use of hearing protection devices (HPD), we subtracted 10 dB from every <span class="hlt">noise</span> recording obtained during HPD use and estimated the <span class="hlt">noise</span> <span class="hlt">level</span> at the ear. Salivary cortisol concentration was measured at 20.00 h, the following day at awakening, and 30 min after awakening on average 5, 14 and 14.5h after finishing work. The mean ambient <span class="hlt">noise</span> exposure <span class="hlt">level</span> was 79.9 dB(A) [range: 55.0-98.9] and the mean estimated <span class="hlt">level</span> at the ear 77.7 dB(A) [range: 55.0-94.2]. In linear and mixed regression models that adjusted for age, sex, current smoking, heavy alcohol consumption, personal income, BMI, leisure-time <span class="hlt">noise</span> exposure <span class="hlt">level</span>, time since occupational <span class="hlt">noise</span> exposure ceased, awakening time, and time of saliva sampling, we observed no statistically significant exposure response relation between recent, or long-term ambient occupational <span class="hlt">noise</span> exposure <span class="hlt">level</span> and any cortisol parameter off work. This was neither the case for recent <span class="hlt">noise</span> <span class="hlt">level</span> at the ear. To conclude, neither recent nor long-term occupational <span class="hlt">noise</span> exposure <span class="hlt">levels</span> were associated with increased cortisol <span class="hlt">level</span> off work. Thus, our results do not indicate that a sustained activation of the HPA axis, as measured by cortisol, is involved in</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25865218','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25865218"><span>Effect of background <span class="hlt">noise</span> on neuronal coding of interaural <span class="hlt">level</span> difference cues in rat inferior colliculus.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mokri, Yasamin; Worland, Kate; Ford, Mark; Rajan, Ramesh</p> <p>2015-07-01</p> <p>Humans can accurately localize sounds even in unfavourable signal-to-<span class="hlt">noise</span> conditions. To investigate the neural mechanisms underlying this, we studied the effect of background wide-band <span class="hlt">noise</span> on neural sensitivity to variations in interaural <span class="hlt">level</span> difference (ILD), the predominant cue for sound localization in azimuth for high-frequency sounds, at the characteristic frequency of cells in rat inferior colliculus (IC). Binaural <span class="hlt">noise</span> at high <span class="hlt">levels</span> generally resulted in suppression of responses (55.8%), but at lower <span class="hlt">levels</span> resulted in enhancement (34.8%) as well as suppression (30.3%). When recording conditions permitted, we then examined if any binaural <span class="hlt">noise</span> effects were related to selective <span class="hlt">noise</span> effects at each of the two ears, which we interpreted in light of well-known differences in input type (excitation and inhibition) from each ear shaping particular forms of ILD sensitivity in the IC. At high signal-to-<span class="hlt">noise</span> ratios (SNR), in most ILD functions (41%), the effect of background <span class="hlt">noise</span> appeared to be due to effects on inputs from both ears, while for a large percentage (35.8%) appeared to be accounted for by effects on excitatory input. However, as SNR decreased, change in excitation became the dominant contributor to the change due to binaural background <span class="hlt">noise</span> (63.6%). These novel findings shed light on the IC neural mechanisms for sound localization in the presence of continuous background <span class="hlt">noise</span>. They also suggest that some effects of background <span class="hlt">noise</span> on encoding of sound location reported to be emergent in upstream auditory areas can also be observed at the <span class="hlt">level</span> of the midbrain.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4997495','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4997495"><span>Sleep Disturbance from Road Traffic, Railways, Airplanes and from Total Environmental <span class="hlt">Noise</span> <span class="hlt">Levels</span> in Montreal</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Perron, Stéphane; Plante, Céline; Ragettli, Martina S.; Kaiser, David J.; Goudreau, Sophie; Smargiassi, Audrey</p> <p>2016-01-01</p> <p>The objective of our study was to measure the impact of transportation-related <span class="hlt">noise</span> and total environmental <span class="hlt">noise</span> on sleep disturbance for the residents of Montreal, Canada. A telephone-based survey on <span class="hlt">noise</span>-related sleep disturbance among 4336 persons aged 18 years and over was conducted. LNight for each study participant was estimated using a land use regression (LUR) model. Distance of the respondent’s residence to the nearest transportation <span class="hlt">noise</span> source was also used as an indicator of <span class="hlt">noise</span> exposure. The proportion of the population whose sleep was disturbed by outdoor environmental <span class="hlt">noise</span> in the past 4 weeks was 12.4%. The proportion of those affected by road traffic, airplane and railway <span class="hlt">noise</span> was 4.2%, 1.5% and 1.1%, respectively. We observed an increased prevalence in sleep disturbance for those exposed to both rail and road <span class="hlt">noise</span> when compared for those exposed to road only. We did not observe an increased prevalence in sleep disturbance for those that were both exposed to road and planes when compared to those exposed to road or planes only. We developed regression models to assess the marginal proportion of sleep disturbance as a function of estimated LNight and distance to transportation <span class="hlt">noise</span> sources. In our models, sleep disturbance increased with proximity to transportation <span class="hlt">noise</span> sources (railway, airplane and road traffic) and with increasing LNight values. Our study provides a quantitative estimate of the association between total environmental <span class="hlt">noise</span> <span class="hlt">levels</span> estimated using an LUR model and sleep disturbance from transportation <span class="hlt">noise</span>. PMID:27529260</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title33-vol2/pdf/CFR-2010-title33-vol2-sec149-697.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title33-vol2/pdf/CFR-2010-title33-vol2-sec149-697.pdf"><span>33 CFR 149.697 - What are the requirements for a <span class="hlt">noise</span> <span class="hlt">level</span> survey?</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... HOMELAND SECURITY (CONTINUED) DEEPWATER PORTS DEEPWATER PORTS: DESIGN, CONSTRUCTION, AND EQUIPMENT Design... accommodation spaces, must be designed to limit the <span class="hlt">noise</span> <span class="hlt">level</span> in those areas so that personnel wearing...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1213147','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1213147"><span>Measurement of SQUID <span class="hlt">noise</span> <span class="hlt">levels</span> for SuperCDMS SNOLAB detectors - Final Paper</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lee, Maxwell</p> <p>2015-08-27</p> <p>SuperCDMS SNOLAB is a second generation direct dark matter search. In the SuperCDMS SNOLAB experiment, detectors are able to pick up from signals from dark matter nuclear recoil interactions which occur inside the bulk of the detectors. These interactions produce both phonon and charge signals. HEMTs read out charge signals whereas TES are used to detect phonon signals which are then read out by SQUID amplifiers. SQUID amplifiers must add negligible <span class="hlt">noise</span> to the TES intrinsic <span class="hlt">noise</span> which has been previously measured and is approximately 50pA/√Hz down to 100Hz for ease of signal distinguishability in dark matter nuclear interactions. The intrinsic <span class="hlt">noise</span> <span class="hlt">level</span> of the SQUID was tested in the SLAC 300mK fridge and determined to provide adequately low <span class="hlt">levels</span> of <span class="hlt">noise</span> with a floor of approximately 3pA/√Hz. Furthermore, a 10x amplifier was tested for addition of extraneous <span class="hlt">noise</span>. This <span class="hlt">noise</span> was investigated with and without this amplifier, and it was found that it did not add a significant amount of <span class="hlt">noise</span> to the intrinsic SQUID <span class="hlt">noise</span>.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22135145','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22135145"><span>Aircraft <span class="hlt">noise</span> exposure affects rat behavior, plasma norepinephrine <span class="hlt">levels</span>, and cell morphology of the temporal lobe.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Di, Guo-Qing; Zhou, Bing; Li, Zheng-Guang; Lin, Qi-Li</p> <p>2011-12-01</p> <p>In order to investigate the physiological effects of airport <span class="hlt">noise</span> exposure on organisms, in this study, we exposed Sprague-Dawley rats in soundproof chambers to previously recorded aircraft-related <span class="hlt">noise</span> for 65 d. For comparison, we also used unexposed control rats. <span class="hlt">Noise</span> was arranged according to aircraft flight schedules and was adjusted to its weighted equivalent continuous perceived <span class="hlt">noise</span> <span class="hlt">levels</span> (L(WECPN)) of 75 and 80 dB for the two experimental groups. We examined rat behaviors through an open field test and measured the concentrations of plasma norepinephrine (NE) by high performance liquid chromatography-fluorimetric detection (HPLC-FLD). We also examined the morphologies of neurons and synapses in the temporal lobe by transmission electron microscopy (TEM). Our results showed that rats exposed to airport <span class="hlt">noise</span> of 80 dB had significantly lower line crossing number (P<0.05) and significantly longer center area duration (P<0.05) than control animals. After 29 d of airport <span class="hlt">noise</span> exposure, the concentration of plasma NE of exposed rats was significantly higher than that of the control group (P<0.05). We also determined that the neuron and synapsis of the temporal lobe of rats showed signs of damage after aircraft <span class="hlt">noise</span> of 80 dB exposure for 65 d. In conclusion, exposing rats to long-term aircraft <span class="hlt">noise</span> affects their behaviors, plasma NE <span class="hlt">levels</span>, and cell morphology of the temporal lobe.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3232429','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3232429"><span>Aircraft <span class="hlt">noise</span> exposure affects rat behavior, plasma norepinephrine <span class="hlt">levels</span>, and cell morphology of the temporal lobe*</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Di, Guo-qing; Zhou, Bing; Li, Zheng-guang; Lin, Qi-li</p> <p>2011-01-01</p> <p>In order to investigate the physiological effects of airport <span class="hlt">noise</span> exposure on organisms, in this study, we exposed Sprague-Dawley rats in soundproof chambers to previously recorded aircraft-related <span class="hlt">noise</span> for 65 d. For comparison, we also used unexposed control rats. <span class="hlt">Noise</span> was arranged according to aircraft flight schedules and was adjusted to its weighted equivalent continuous perceived <span class="hlt">noise</span> <span class="hlt">levels</span> (L WECPN) of 75 and 80 dB for the two experimental groups. We examined rat behaviors through an open field test and measured the concentrations of plasma norepinephrine (NE) by high performance liquid chromatography-fluorimetric detection (HPLC-FLD). We also examined the morphologies of neurons and synapses in the temporal lobe by transmission electron microscopy (TEM). Our results showed that rats exposed to airport <span class="hlt">noise</span> of 80 dB had significantly lower line crossing number (P<0.05) and significantly longer center area duration (P<0.05) than control animals. After 29 d of airport <span class="hlt">noise</span> exposure, the concentration of plasma NE of exposed rats was significantly higher than that of the control group (P<0.05). We also determined that the neuron and synapsis of the temporal lobe of rats showed signs of damage after aircraft <span class="hlt">noise</span> of 80 dB exposure for 65 d. In conclusion, exposing rats to long-term aircraft <span class="hlt">noise</span> affects their behaviors, plasma NE <span class="hlt">levels</span>, and cell morphology of the temporal lobe. PMID:22135145</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22759906','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22759906"><span>Rat hippocampal alterations could underlie behavioral abnormalities induced by exposure to moderate <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Uran, S L; Aon-Bertolino, M L; Caceres, L G; Capani, F; Guelman, L R</p> <p>2012-08-30</p> <p><span class="hlt">Noise</span> exposure is known to affect auditory structures in living organisms. However, it should not be ignored that many of the effects of <span class="hlt">noise</span> are extra-auditory. Previous findings of our laboratory demonstrated that <span class="hlt">noise</span> was able to induce behavioral alterations that are mainly related to the cerebellum (CE) and the hippocampus (HC). Therefore, the aim of this work was to reveal new data about the vulnerability of developing rat HC to moderate <span class="hlt">noise</span> <span class="hlt">levels</span> through the assessment of potential histological changes and hippocampal-related behavioral alterations. Male Wistar rats were exposed to <span class="hlt">noise</span> (95-97 dB SPL, 2h daily) either for 1 day (acute <span class="hlt">noise</span> exposure, ANE) or between postnatal days 15 and 30 (sub-acute <span class="hlt">noise</span> exposure, SANE). Hippocampal histological evaluation as well as short (ST) and long term (LT) habituation and recognition memory assessments were performed. Results showed a mild disruption in the different hippocampal regions after ANE and SANE schemes, along with significant behavioral abnormalities. These data suggest that exposure of developing rats to <span class="hlt">noise</span> <span class="hlt">levels</span> of moderate intensity is able to trigger changes in the HC, an extra-auditory structure of the Central Nervous System (CNS), that could underlie the observed behavioral effects.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AcAau..68.1079K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AcAau..68.1079K"><span>Ensuring an <span class="hlt">acceptable</span> reliability and safety <span class="hlt">level</span> for a launch complex</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kadzhaev, Vadim; Barmin, Igor; Denoyers, Jean-Yves; Ragot, Alain</p> <p>2011-04-01</p> <p>Some key aspects and criteria tasks for ensuring an <span class="hlt">acceptable</span> reliability and safety <span class="hlt">level</span> for complex technical systems are discussed in the view of successful operation of a launch complex, at the stage of Launch Vehicle (LV) preparation. The standards and principles of adequate characteristics for launch site core technological systems are defined. The tasks for evaluation the probability of faultless operation for the systems, their reliability a posteriori, and safety barriers formation are described. The model of the pre-launch phase is presented as a random process, in the form of "simple Poisson flow".</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA156897','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA156897"><span><span class="hlt">Acceptability</span> of Low <span class="hlt">Level</span> White Lighting in the Control Room at Sea</span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>2014-08-05</p> <p>LIGHTING IN THE CONTROL ROOM AT SEA by S. M. Luria and D. A. Kobus Naval Medical Research and Development Command Research Work Unit M0100.001...release; distribution unlimited. <span class="hlt">ACCEPTABILITY</span> OF LOW <span class="hlt">LEVEL</span> WHITE LIGHTING " IN THE CONTROL ROOM AT SEA by S. M. Luria , Ph.D. David A. Kobus, LT...ltr 9330 Ser 51/434 to CO, NSMRL of 18 Nov 1984. 3 Luria , S. M. and David A. Kobus. The relative effectiveness of red and white light for</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19433121','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19433121"><span>Comparison of the <span class="hlt">acceptability</span> ratings of appetizers under laboratory, base <span class="hlt">level</span> and high altitude field conditions.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Premavalli, K S; Wadikar, D D; Nanjappa, C</p> <p>2009-08-01</p> <p>The relationship between laboratory and field ratings was investigated for six different appetizers, including four ready-to-reconstitute mixes and two ready-to-eat munches. Liking ratings on a 5-point hedonic scale were obtained from an Indian Army field study at base <span class="hlt">level</span> as well as at an altitude of 11,500 ft above sea <span class="hlt">level</span> and for the same appetizers in the laboratory. The field trials of the six products were conducted in two phases and results revealed that the products were more <span class="hlt">acceptable</span> at altitude, with increased liking scores as compared to base <span class="hlt">level</span>. Subjective ratings for hunger revealed that at altitude, appetizer consumption had stimulated the appetite of the soldiers. The ability of laboratory ratings to predict <span class="hlt">acceptability</span> of foods consumed under realistic conditions appears to depend on the convenience of the appetizer as well as the environmental conditions and the psycho-physiological status of the participants. The appetizers received higher ratings at altitude because of the pungent and spicy nature of appetizer mixes as compared with base field and laboratory conditions. However, for all the appetizers the pungent and sweet taste of the appetizer munches was highly preferred.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27902452','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27902452"><span>High ambient <span class="hlt">noise</span> <span class="hlt">levels</span> in Vadodara City, India, affected by urbanization.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Singh, Neha; Dhiman, Hitesh; Shaikh, Sadaf; Shah, Purvish; Sarkar, Roma; Patel, Shashin</p> <p>2016-12-01</p> <p>The present research was conducted to study the urbanization of Vadodara city and to monitor the ambient <span class="hlt">noise</span> <span class="hlt">level</span> in the industrial, commercial, residential and silence zones of the city. A settlement map created by unsupervised classification for the land use and land cover study of Vadodara city clearly shows the increasing pattern of urbanization in its central part, which may be the result of urban sprawl due to migration of people from the rural to the urban areas. The fluctuation in ambient <span class="hlt">noise</span> <span class="hlt">level</span> was recorded using an A-weighted sound <span class="hlt">level</span> meter in all the four zones of Vadodara city for 3 h at regular intervals of 15 min on 3 consecutive days at the same time. The results showed the highest equivalent <span class="hlt">noise</span> <span class="hlt">level</span> of 93.7 dBA in the commercial zone followed by 85.5 dBA in the industrial zone, 73.2 dBA in silence zone, and 70.2 dBA in the residential zone. The values of <span class="hlt">noise</span> <span class="hlt">level</span> were high in all the zones of the city increasing remarkably over the prescribed limit given in the <span class="hlt">Noise</span> Pollution (Control and Regulation) Rules, 2000. Continuous exposure to such high <span class="hlt">level</span> of <span class="hlt">noise</span> may lead to detrimental effect on people.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4900493','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4900493"><span>Effects of pedagogical ideology on the perceived loudness and <span class="hlt">noise</span> <span class="hlt">levels</span> in preschools</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Jonsdottir, Valdis; Rantala, Leena M.; Oskarsson, Gudmundur Kr.; Sala, Eeva</p> <p>2015-01-01</p> <p>High activity <span class="hlt">noise</span> <span class="hlt">levels</span> that result in detrimental effects on speech communication have been measured in preschools. To find out if different pedagogical ideologies affect the perceived loudness and <span class="hlt">levels</span> of <span class="hlt">noise</span>, a questionnaire study inquiring about the experience of loudness and voice symptoms was carried out in Iceland in eight private preschools, called “Hjalli model”, and in six public preschools. <span class="hlt">Noise</span> <span class="hlt">levels</span> were also measured in the preschools. Background variables (stress <span class="hlt">level</span>, age, length of working career, education, smoking, and number of children per teacher) were also analyzed in order to determine how much they contributed toward voice symptoms and the experience of noisiness. Results indicate that pedagogical ideology is a significant factor for predicting <span class="hlt">noise</span> and its consequences. Teachers in the preschool with tighter pedagogical control of discipline (the “Hjalli model”) experienced lower activity <span class="hlt">noise</span> loudness than teachers in the preschool with a more relaxed control of behavior (public preschool). Lower <span class="hlt">noise</span> <span class="hlt">levels</span> were also measured in the “Hjalli model” preschool and fewer “Hjalli model” teachers reported voice symptoms. Public preschool teachers experienced more stress than “Hjalli model” teachers and the stress <span class="hlt">level</span> was, indeed, the background variable that best explained the voice symptoms and the teacher's perception of a noisy environment. Discipline, structure, and organization in the type of activity predicted the activity <span class="hlt">noise</span> <span class="hlt">level</span> better than the number of children in the group. Results indicate that pedagogical ideology is a significant factor for predicting self-reported <span class="hlt">noise</span> and its consequences. PMID:26356370</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title14-vol1/pdf/CFR-2010-title14-vol1-part36-appB.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title14-vol1/pdf/CFR-2010-title14-vol1-part36-appB.pdf"><span>14 CFR Appendix B to Part 36 - <span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-01-01</p> <p>... Airplanes Under § 36.103 B Appendix B to Part 36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION..., App. B Appendix B to Part 36—<span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103 Sec..., must be used to determine <span class="hlt">noise</span> <span class="hlt">levels</span> of an airplane. These <span class="hlt">noise</span> <span class="hlt">levels</span> must be used to...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol1/pdf/CFR-2012-title14-vol1-part36-appB.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title14-vol1/pdf/CFR-2012-title14-vol1-part36-appB.pdf"><span>14 CFR Appendix B to Part 36 - <span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-01-01</p> <p>... Airplanes Under § 36.103 B Appendix B to Part 36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION..., App. B Appendix B to Part 36—<span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103 Sec..., must be used to determine <span class="hlt">noise</span> <span class="hlt">levels</span> of an airplane. These <span class="hlt">noise</span> <span class="hlt">levels</span> must be used to...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol1/pdf/CFR-2014-title14-vol1-part36-appB.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title14-vol1/pdf/CFR-2014-title14-vol1-part36-appB.pdf"><span>14 CFR Appendix B to Part 36 - <span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-01-01</p> <p>... Airplanes Under § 36.103 B Appendix B to Part 36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION..., App. B Appendix B to Part 36—<span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103 Sec... equivalent procedures, must be used to determine <span class="hlt">noise</span> <span class="hlt">levels</span> of an airplane. These <span class="hlt">noise</span> <span class="hlt">levels</span> must be...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title14-vol1/pdf/CFR-2011-title14-vol1-part36-appB.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title14-vol1/pdf/CFR-2011-title14-vol1-part36-appB.pdf"><span>14 CFR Appendix B to Part 36 - <span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-01-01</p> <p>... Airplanes Under § 36.103 B Appendix B to Part 36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION..., App. B Appendix B to Part 36—<span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103 Sec..., must be used to determine <span class="hlt">noise</span> <span class="hlt">levels</span> of an airplane. These <span class="hlt">noise</span> <span class="hlt">levels</span> must be used to...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title14-vol1/pdf/CFR-2013-title14-vol1-part36-appB.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title14-vol1/pdf/CFR-2013-title14-vol1-part36-appB.pdf"><span>14 CFR Appendix B to Part 36 - <span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-01-01</p> <p>... Airplanes Under § 36.103 B Appendix B to Part 36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION..., App. B Appendix B to Part 36—<span class="hlt">Noise</span> <span class="hlt">Levels</span> for Transport Category and Jet Airplanes Under § 36.103 Sec..., must be used to determine <span class="hlt">noise</span> <span class="hlt">levels</span> of an airplane. These <span class="hlt">noise</span> <span class="hlt">levels</span> must be used to...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28176048','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28176048"><span>Influences of environmental <span class="hlt">noise</span> <span class="hlt">level</span> and respiration rate on the accuracy of acoustic respiration rate monitoring.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yabuki, Shizuha; Toyama, Hiroaki; Takei, Yusuke; Wagatsuma, Toshihiro; Yabuki, Hiroshi; Yamauchi, Masanori</p> <p>2017-02-07</p> <p>We tested the hypothesis that the environmental <span class="hlt">noise</span> generated by a forced-air warming system reduces the monitoring accuracy of acoustic respiration rate (RRa). <span class="hlt">Noise</span> <span class="hlt">levels</span> were adjusted to 45-55, 56-65, 66-75, and 76-85 dB. Healthy participants breathed at set respiration rates (RRset) of 6, 12, and 30/min. Under each <span class="hlt">noise</span> <span class="hlt">level</span> at each RRset, the respiration rates by manual counting (RRm) and RRa were recorded. Any appearance of the alarm display on the RRa monitor was also recorded. Each RRm of all participants agreed with each RRset at each <span class="hlt">noise</span> <span class="hlt">level</span>. At 45-55 dB <span class="hlt">noise</span>, the RRa of 13, 17, and 17 participants agreed with RRset of 6, 12, and 30/min, respectively. The RRa of 14, 17, and 16 participants at 56-65 dB <span class="hlt">noise</span>, agreed with RRset of 6, 12, and 30/min, respectively. At 66-75 dB <span class="hlt">noise</span>, the RRa of 9, 15, and 16 participants agreed with RRset of 6, 12, and 30/min, respectively. The RRa of one, nine, and nine participants at 76-85 dB <span class="hlt">noise</span> agreed with RRset of 6, 12, and 30/min, respectively, which was significantly less than the other <span class="hlt">noise</span> <span class="hlt">levels</span> (P < 0.05). Overall, 72.9% of alarm displays highlighted incorrect values of RRa. In a noisy situation involving the operation of a forced-air warming system, the acoustic respiration monitoring should be used carefully especially in patients with a low respiration rate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4006586','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4006586"><span>Recovery of otoacoustic emissions after high-<span class="hlt">level</span> <span class="hlt">noise</span> exposure in the American bullfrog</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Simmons, Dwayne D.; Lohr, Rachel; Wotring, Helena; Burton, Miriam D.; Hooper, Rebecca A.; Baird, Richard A.</p> <p>2014-01-01</p> <p>The American bullfrog (Rana catesbeiana) has an amphibian papilla (AP) that senses airborne, low-frequency sound and generates distortion product otoacoustic emissions (DPOAEs) similar to other vertebrate species. Although ranid frogs are typically found in noisy environments, the effects of <span class="hlt">noise</span> on the AP have not been studied. First, we determined the <span class="hlt">noise</span> <span class="hlt">levels</span> that diminished DPOAE at 2f1–f2 using an f2 stimulus <span class="hlt">level</span> at 80 dB SPL and that also produced morphological damage of the sensory epithelium. Second, we compared DPOAE (2f1–f2) responses with histopathologic changes occurring in bullfrogs after <span class="hlt">noise</span> exposure. Consistent morphological damage, such as fragmented hair cells and missing bundles, as well as elimination of DPOAE responses were seen only after very high-<span class="hlt">level</span> (>150 dB SPL) sound exposures. The morphological response of hair cells to <span class="hlt">noise</span> differed along the mediolateral AP axis: medial hair cells were sensitive to <span class="hlt">noise</span> and lateral hair cells were relatively insensitive to <span class="hlt">noise</span>. Renewed or repaired hair cells were not observed until 9 days post-exposure. Following <span class="hlt">noise</span> exposure, DPOAE responses disappeared within 24 h and then recovered to normal pre-exposure <span class="hlt">levels</span> within 3–4 days. Our results suggest that DPOAEs in the bullfrog are sensitive to the initial period of hair cell damage. After <span class="hlt">noise</span>-induced damage, the bullfrog AP has functional recovery mechanisms that do not depend on substantial hair cell regeneration or repair. Thus, the bullfrog auditory system might serve as an interesting model for investigation of ways to prevent <span class="hlt">noise</span> damage. PMID:24501139</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/403463','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/403463"><span>Policy on <span class="hlt">acceptable</span> <span class="hlt">levels</span> of earthquake risk for California gas and electric utilities</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>1995-12-31</p> <p>Earthquake specialists from the major California gas and electric power utilities have prepared a policy statement and associated implementation program as a framework for assessing and achieving <span class="hlt">acceptable</span> <span class="hlt">levels</span> of earthquake risk. The policy states: ``Each California gas and electric power utility system shall withstand earthquakes to provide reasonable protection of life, to limit damage to property, and to provide for resumption of utility system functions in a reasonable and timely manner.`` The policy scope is broad, to permit its application to utilities in the differing seismic hazard regions of the State. Because each utility also has its own unique earthquake vulnerabilities, it also has it own long-term seismic safety implementation plan. It is the goal of this policy that each utility meet its responsibilities to provide reasonable public safety and customer service. Compliance will not prevent all loss of life, property damage, or loss of utility function. Experience with recent earthquakes in California suggests that implementing this policy through long-term implementation plans is an effective and practical means of reducing earthquake vulnerability to <span class="hlt">acceptable</span> <span class="hlt">levels</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5187653','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5187653"><span>Determination of the <span class="hlt">Level</span> of <span class="hlt">Noise</span> in Nurseries and Pre-schools and the Teachers’ <span class="hlt">Level</span> of Annoyance</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Gokdogan, Ozan; Gokdogan, Cagil</p> <p>2016-01-01</p> <p>Objective: The aim of this article is to determine the <span class="hlt">level</span> of <span class="hlt">noise</span> in nurseries and pre-schools and also to compare measured <span class="hlt">levels</span> with standard <span class="hlt">levels</span> and evaluate the teachers’ <span class="hlt">level</span> of annoyance. Materials and Methods: The <span class="hlt">level</span> of <span class="hlt">noise</span> was measured in three different schools. A total of 162 students, whose ages were between 3 and 6 years, and 12 teachers were included the study. Every age groups’ <span class="hlt">level</span> of <span class="hlt">noise</span> was measured during sleeping, gaming, and eating activity. In addition, teachers’ annoyance was assessed in different age groups. Results: The 4- to 6-year-old groups were found to have higher <span class="hlt">level</span> of sounds than 3-year-old group. Eating period was found to be the highest <span class="hlt">level</span> of sound whereas sleeping was found the lowest. Furthermore, teachers’ annoyance was found higher as the age decreased. Conclusion: Nurseries and pre-schools have noisy environment both for the students and the teachers. High <span class="hlt">level</span> of <span class="hlt">noise</span>, which has bad effects on health, is a public health problem. Both the students’ families and teachers must be aware of this annoying situation. PMID:27762254</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=detection+AND+advanced+AND+waves&id=EJ688624','ERIC'); return false;" href="http://eric.ed.gov/?q=detection+AND+advanced+AND+waves&id=EJ688624"><span>A Temporal Model of <span class="hlt">Level</span>-Invariant, Tone-in-<span class="hlt">Noise</span> Detection</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Berg, Bruce G.</p> <p>2004-01-01</p> <p><span class="hlt">Level</span>-invariant detection refers to findings that thresholds in tone-in-<span class="hlt">noise</span> detection are unaffected by roving-<span class="hlt">level</span> procedures that degrade energy cues. Such data are inconsistent with ideas that detection is based on the energy passed by an auditory filter. A hypothesis that detection is based on a <span class="hlt">level</span>-invariant temporal cue is advanced.…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/10875369','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/10875369"><span>Community reaction to aircraft <span class="hlt">noise</span>: time-of-day penalty and tradeoff between <span class="hlt">levels</span> of overflights.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Miedema, H M; Vos, H; de Jong, R G</p> <p>2000-06-01</p> <p>A decrease in the <span class="hlt">level</span> of sound events can compensate for an increase in the <span class="hlt">level</span> of other events, but <span class="hlt">noise</span> metrics assume different tradeoffs. <span class="hlt">Noise</span> metrics also differ in the penalty applied to <span class="hlt">noise</span> in the evening and to <span class="hlt">noise</span> in the night, and in the definition of these periods. These two aspects of <span class="hlt">noise</span> metrics, i.e., the tradeoff and the penalty for the nighttime (23-7h), are investigated. A general model of the relation between SELs of sound events (aircraft overflights) and <span class="hlt">noise</span> annoyance is presented which allows for a wide range of tradeoffs and time-of-day penalties. The (tradeoff and time-of-day penalty) parameters of the model are fitted to the data from an aircraft <span class="hlt">noise</span> study conducted around Amsterdam Airport Schiphol, which is especially suited for investigating the tradeoff and time-of-day penalties. It was found that in this study the tradeoff between the <span class="hlt">levels</span> of events in metrics based on L(Aeq)'s, such as L(Aeq)(24 h), DNL, and DENL, is approximately correct for the prediction of <span class="hlt">noise</span> annoyance. Furthermore, it was found that the strongest correlation with annoyance is obtained with a nighttime penalty of circa 10 dB. No suitable data were available for further tests of the tradeoff. The result with respect to the nighttime penalty was weakly further supported by the outcome of analyses of the original data from four other aircraft <span class="hlt">noise</span> surveys (one survey conducted around British airports, and three coordinated surveys carried out around Paris Orly, Amsterdam Schiphol, and Glasgow Abbotsinch).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016SPIE.9902E..0EZ','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016SPIE.9902E..0EZ"><span>Extracting fingerprint of wireless devices based on phase <span class="hlt">noise</span> and multiple <span class="hlt">level</span> wavelet decomposition</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhao, Weichen; Sun, Zhuo; Kong, Song</p> <p>2016-10-01</p> <p>Wireless devices can be identified by the fingerprint extracted from the signal transmitted, which is useful in wireless communication security and other fields. This paper presents a method that extracts fingerprint based on phase <span class="hlt">noise</span> of signal and multiple <span class="hlt">level</span> wavelet decomposition. The phase of signal will be extracted first and then decomposed by multiple <span class="hlt">level</span> wavelet decomposition. The statistic value of each wavelet coefficient vector is utilized for constructing fingerprint. Besides, the relationship between wavelet decomposition <span class="hlt">level</span> and recognition accuracy is simulated. And advertised decomposition <span class="hlt">level</span> is revealed as well. Compared with previous methods, our method is simpler and the accuracy of recognition remains high when Signal <span class="hlt">Noise</span> Ratio (SNR) is low.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19810015177','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19810015177"><span>Cumulative annoyance due to multiple aircraft flyover with differing peak <span class="hlt">noise</span> <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shepherd, K. P.</p> <p>1981-01-01</p> <p>A laboratory study in which 160 subjects judged the annoyance of 30 minute sessions of aircraft <span class="hlt">noise</span> is described. Each session contained nine flyovers consisting of various combinations of three takeoff recordings of Boeing 727. The subjects were asked to judge their annoyance in the simulated living room environment of the laboratory and also to assess how annoyed they would be if they heard the <span class="hlt">noise</span> in their home during the day, evening, and night periods. The standard deviation of the sound <span class="hlt">level</span> did not improve the predictive ability of L sub eq (equivalent continuous sound <span class="hlt">level</span>) which performed as well or better than other <span class="hlt">noise</span> measured. Differences were found between the projected home responses for the day, evening, and nighttime periods. Time of day penalties derived from these results showed reasonable agreement with those currently used in community <span class="hlt">noise</span> indices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016EGUGA..18.3518M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016EGUGA..18.3518M"><span>Compact and lightweight VLF/LF magnetic antenna with femtotesla <span class="hlt">noise</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Marusenkov, Andriy</p> <p>2016-04-01</p> <p>The measurements of the electromagnetic field in the frequency band 3-300 kHz are widely used for subsurface geophysical surveys, investigations of the various phenomena in the Earth-ionosphere cavity, in the ionosphere and in the magnetosphere, including those connected with seismic and lightning activity. The instrumental <span class="hlt">noise</span> has to be as low as possible in order to reliably detect the weakest electromagnetic signals, which magnitude could be only a few femtoteslas. In order to decrease magnetic antenna <span class="hlt">noises</span> the size and mass of the probe has to be increased. However, such approach could be hardly applied for development of mobile sensors. In this report the efforts to achieve the minimal possible <span class="hlt">noise</span> <span class="hlt">level</span> at the restricted weight and size of the magnetic antenna are presented. Applying the minimal mass criteria the <span class="hlt">noise</span> <span class="hlt">level</span> of the induction coil with a high permeability magnetic core, used as a probe, was optimized. The new pre-amplifier, based on the ultra low <span class="hlt">noise</span> field effect transistor, was developed. The special attention was paid to the design of the electrostatic screen, which has to generate negligible magnetic <span class="hlt">noise</span>. As a result, the 300 mm long, 25 mm diameter antenna has the <span class="hlt">noise</span> <span class="hlt">level</span> approximately 1 fT/sqrt(Hz) in the frequency band 50 - 200 kHz and <5 fT/sqrt(Hz) in the band 3 - 500 kHz. The mass of the antenna is equal to 0.27 kg for the weather protected version and 0.15 kg for the indoor version. The possibilities to achieve even lower <span class="hlt">noise</span> <span class="hlt">level</span> at the same size of the instrument will be also discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010SPIE.7521E..0FG','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010SPIE.7521E..0FG"><span><span class="hlt">Noise</span> suppression in three-<span class="hlt">level</span> atomic system driven by quantized field</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gelman, A.; Mironov, V.</p> <p>2010-02-01</p> <p>Numerically by the Monte-Carlo wave function (MCWF) method and analytically by the Heisenberg-Langevin method the interaction of three-<span class="hlt">level</span> atom with quantized electromagnetic field is investigated in the conditions of electromagnetically induced transparency (EIT) conditions. A possibility of <span class="hlt">noise</span> suppression in atomic system by means of quantum features of squeezed light is examined in detail. The characteristics of atomic system responsible for relaxation processes and <span class="hlt">noise</span> in EIT are found.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009SPIE.7521E..0FG','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009SPIE.7521E..0FG"><span><span class="hlt">Noise</span> suppression in three-<span class="hlt">level</span> atomic system driven by quantized field</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gelman, A.; Mironov, V.</p> <p>2009-10-01</p> <p>Numerically by the Monte-Carlo wave function (MCWF) method and analytically by the Heisenberg-Langevin method the interaction of three-<span class="hlt">level</span> atom with quantized electromagnetic field is investigated in the conditions of electromagnetically induced transparency (EIT) conditions. A possibility of <span class="hlt">noise</span> suppression in atomic system by means of quantum features of squeezed light is examined in detail. The characteristics of atomic system responsible for relaxation processes and <span class="hlt">noise</span> in EIT are found.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25618049','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25618049"><span>A survey of acoustic conditions and <span class="hlt">noise</span> <span class="hlt">levels</span> in secondary school classrooms in England.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shield, Bridget; Conetta, Robert; Dockrell, Julie; Connolly, Daniel; Cox, Trevor; Mydlarz, Charles</p> <p>2015-01-01</p> <p>An acoustic survey of secondary schools in England has been undertaken. Room acoustic parameters and background <span class="hlt">noise</span> <span class="hlt">levels</span> were measured in 185 unoccupied spaces in 13 schools to provide information on the typical acoustic environment of secondary schools. The unoccupied acoustic and <span class="hlt">noise</span> data were correlated with various physical characteristics of the spaces. Room height and the amount of glazing were related to the unoccupied reverberation time and therefore need to be controlled to reduce reverberation to suitable <span class="hlt">levels</span> for teaching and learning. Further analysis of the unoccupied data showed that the introduction of legislation relating to school acoustics in England and Wales in 2003 approximately doubled the number of school spaces complying with current standards. <span class="hlt">Noise</span> <span class="hlt">levels</span> were also measured during 274 lessons to examine typical <span class="hlt">levels</span> generated during teaching activities in secondary schools and to investigate the influence of acoustic design on working <span class="hlt">noise</span> <span class="hlt">levels</span> in the classroom. Comparison of unoccupied and occupied data showed that unoccupied acoustic conditions affect the <span class="hlt">noise</span> <span class="hlt">levels</span> occurring during lessons. They were also related to the time spent in disruption to the lessons (e.g., students talking or shouting) and so may also have an impact upon student behavior in the classroom.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19274486','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19274486"><span>Assessment of <span class="hlt">noise</span> <span class="hlt">level</span> in sundry processing and manufacturing industries in Ilorin metropolis, Nigeria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Oyedepo, Olayinka S; Saadu, Abdullahi A</p> <p>2010-03-01</p> <p>In this work, <span class="hlt">noise</span> <span class="hlt">level</span> in five selected processing and manufacturing industries in Ilorin are evaluated and compared. Emphasis is given to <span class="hlt">noise</span> emitted by individual industrial machinery from the selected industries. Event L(Aeq) and L(N) cycles were studied to identify the noisy machines and to generate baseline data. Findings show that hammer mill machine from mineral-bearing rock-crushing mills produced the highest average <span class="hlt">noise</span> [98.4 dB(A)], an electric generator 1 [95.6 dB(A)] from the soft drink bottling industry, an electric generator [97.7 dB(A)] from the beer brewing and bottling industry, a vacuum pump [93.1 dB(A)] from the tobacco making industry, and an electric generator 2 [94.1 dB(A)] from the mattress-making industry. The highest and lowest average <span class="hlt">noise</span> exposure <span class="hlt">levels</span> are recorded in mineral-bearing rock-crushing mills [93.16 dB(A)] and the mattress making industry [84.69 dB(A)], respectively. The study shows that, at 95% confidence <span class="hlt">level</span>, there is significant difference (P < 0.05) in <span class="hlt">noise</span> <span class="hlt">levels</span> in the industries surveyed. The percentages of machines that emit <span class="hlt">noise</span> above Federal Environmental Protection Agency and Occupational Safety and Health Administration recommendations [90 dB(A)] are from the soft drink bottling industry (83.3%), the beer brewing and bottling industry (42.9%), the tobacco making industry (71.4%), the mattress making industry (11.1%), and minerals crushing mills (87.5%). In the past 20 years, the <span class="hlt">noise</span> <span class="hlt">levels</span> in the soft drink bottling industry were reduced by 0.58 dB(A), and those of the beer brewing and bottling industry were reduced by 9.66 dB(A). However, that of the mattress making industry increased by 2.69 dB(A). On average, the <span class="hlt">noise</span> <span class="hlt">level</span> in these industries has been reduced by 2.52 dB(A). The results of this study show that the <span class="hlt">noise</span> control measures put in place have significant impacts on the <span class="hlt">noise</span> exposure <span class="hlt">level</span> in the industries surveyed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4820284','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4820284"><span>Pilot study of methods and equipment for in-home <span class="hlt">noise</span> <span class="hlt">level</span> measurements</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Neitzel, Richard L.; Heikkinen, Maire S.A.; Williams, Christopher C.; Viet, Susan Marie; Dellarco, Michael</p> <p>2015-01-01</p> <p>Knowledge of the auditory and non-auditory effects of <span class="hlt">noise</span> has increased dramatically over the past decade, but indoor <span class="hlt">noise</span> exposure measurement methods have not advanced appreciably, despite the introduction of applicable new technologies. This study evaluated various conventional and smart devices for exposure assessment in the National Children's Study. Three devices were tested: a sound <span class="hlt">level</span> meter (SLM), a dosimeter, and a smart device with a <span class="hlt">noise</span> measurement application installed. Instrument performance was evaluated in a series of semi-controlled tests in office environments over 96-hour periods, followed by measurements made continuously in two rooms (a child's bedroom and a most used room) in nine participating homes over a 7-day period with subsequent computation of a range of <span class="hlt">noise</span> metrics. The SLMs and dosimeters yielded similar A-weighted average <span class="hlt">noise</span> <span class="hlt">levels</span>. <span class="hlt">Levels</span> measured by the smart devices often differed substantially (showing both positive and negative bias, depending on the metric) from those measured via SLM and dosimeter, and demonstrated attenuation in some frequency bands in spectral analysis compared to SLM results. Virtually all measurements exceeded the Environmental Protection Agency's 45 dBA day-night limit for indoor residential exposures. The measurement protocol developed here can be employed in homes, demonstrates the possibility of measuring long-term <span class="hlt">noise</span> exposures in homes with technologies beyond traditional SLMs, and highlights potential pitfalls associated with measurements made by smart devices. PMID:27053775</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12593149','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12593149"><span>[Effects of peak <span class="hlt">levels</span> and number of <span class="hlt">noise</span> impulses on hearing among forge hammering workers].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Suvorov, G A; Denisov, E I; Antipin, V G; Kharitonov, V I; Starck, Iu; Pyykko, I; Toppila, E</p> <p>2002-01-01</p> <p>The work was aimed (1) to compare actual and expected values of hearing loss in forge hammering workers, using risk evaluation patterns based on impulse <span class="hlt">noise</span> measurements, and (2) to simulate harmful hearing changes caused by impulse <span class="hlt">noise</span>. Study of exposure to <span class="hlt">noise</span> and hearing loss covered forge hammering workers in 2 major blacksmith workshops of automobile enterprise, where equivalent <span class="hlt">levels</span> of acoustic pressure (104 and 106 dB) were equal, but peak <span class="hlt">levels</span> and impalse degrees reliably differed. Hearing thresholds for 2 selected groups of workers (97 and 235 subjects) were evaluated. When compared, actual and expected values of hearing loss calculated according to ISO standard appeared different with excess of 1 dB and 3 dB for the workers in shops 1 and 2 respectively. Excessive hearing loss corresponds to <span class="hlt">noise</span> exposure increased by 3.5 years. Hearing loss in the workers subjected to less impulsive <span class="hlt">noise</span> were readily forecasted by ISO standard 1999-1990. Hearing loss in the workers subjected to more impulsive <span class="hlt">noise</span> were in reliable correlation with combination of peak <span class="hlt">level</span> and impulses number.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3857221','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3857221"><span>A <span class="hlt">Noise</span> <span class="hlt">Level</span> Prediction Method Based on Electro-Mechanical Frequency Response Function for Capacitors</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zhu, Lingyu; Ji, Shengchang; Shen, Qi; Liu, Yuan; Li, Jinyu; Liu, Hao</p> <p>2013-01-01</p> <p>The capacitors in high-voltage direct-current (HVDC) converter stations radiate a lot of audible <span class="hlt">noise</span> which can reach higher than 100 dB. The existing <span class="hlt">noise</span> <span class="hlt">level</span> prediction methods are not satisfying enough. In this paper, a new <span class="hlt">noise</span> <span class="hlt">level</span> prediction method is proposed based on a frequency response function considering both electrical and mechanical characteristics of capacitors. The electro-mechanical frequency response function (EMFRF) is defined as the frequency domain quotient of the vibration response and the squared capacitor voltage, and it is obtained from impulse current experiment. Under given excitations, the vibration response of the capacitor tank is the product of EMFRF and the square of the given capacitor voltage in frequency domain, and the radiated audible <span class="hlt">noise</span> is calculated by structure acoustic coupling formulas. The <span class="hlt">noise</span> <span class="hlt">level</span> under the same excitations is also measured in laboratory, and the results are compared with the prediction. The comparison proves that the <span class="hlt">noise</span> prediction method is effective. PMID:24349105</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/146794','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/146794"><span>Methods for verifying compliance with low-<span class="hlt">level</span> radioactive waste <span class="hlt">acceptance</span> criteria</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>1993-09-01</p> <p>This report summarizes the methods that are currently employed and those that can be used to verify compliance with low-<span class="hlt">level</span> radioactive waste (LLW) disposal facility waste <span class="hlt">acceptance</span> criteria (WAC). This report presents the applicable regulations representing the Federal, State, and site-specific criteria for <span class="hlt">accepting</span> LLW. Typical LLW generators are summarized, along with descriptions of their waste streams and final waste forms. General procedures and methods used by the LLW generators to verify compliance with the disposal facility WAC are presented. The report was written to provide an understanding of how a regulator could verify compliance with a LLW disposal facility`s WAC. A comprehensive study of the methodology used to verify waste generator compliance with the disposal facility WAC is presented in this report. The study involved compiling the relevant regulations to define the WAC, reviewing regulatory agency inspection programs, and summarizing waste verification technology and equipment. The results of the study indicate that waste generators conduct verification programs that include packaging, classification, characterization, and stabilization elements. The current LLW disposal facilities perform waste verification steps on incoming shipments. A model inspection and verification program, which includes an emphasis on the generator`s waste application documentation of their waste verification program, is recommended. The disposal facility verification procedures primarily involve the use of portable radiological survey instrumentation. The actual verification of generator compliance to the LLW disposal facility WAC is performed through a combination of incoming shipment checks and generator site audits.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013APS..MARB25002N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013APS..MARB25002N"><span><span class="hlt">Noise</span> from Two-<span class="hlt">Level</span> Systems in Superconducting Resonators</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Neill, C.; Barends, R.; Chen, Y.; Chiaro, B.; Jeffrey, E.; Kelly, J.; Mariantoni, M.; Megrant, A.; Mutus, J.; Ohya, S.; Sank, D.; Vainsencher, A.; Wenner, J.; White, T.; Cleland, A. N.; Martinis, J. M.</p> <p>2013-03-01</p> <p>Two-<span class="hlt">level</span> systems (TLSs) present in amorphous dielectrics and surface interfaces are a significant source of decoherence in superconducting qubits. Linear microwave resonators offer a valuable instrument for characterizing the strongly power-dependent response of these TLSs. Using quarter-wavelength coplanar waveguide resonators, we monitored the microwave response of the resonator at a single near-resonant frequency versus time at varying microwave drive powers. We observe a time dependent variation of the resonator's internal dissipation and resonance frequency. The amplitude of these variations saturates with power in a manner similar to loss from TLSs. These results provide a means for quantifying the number and distribution of TLSs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003EAEJA.....2555D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003EAEJA.....2555D"><span>Evaluation of <span class="hlt">noise</span> <span class="hlt">level</span> and site response at Mt. Etna volcano and Aeolian Islands</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>D Amico, S.; Giampiccolo, E.; Maiolino, V.; Patanè, D.; Ursino, A.</p> <p>2003-04-01</p> <p>The aim of this work was to test the quality of the sites where the stations of the INGV-CT seismic network are installed. This because most of the installations will be soon improved with new broad-band sensors, which require a low <span class="hlt">level</span> of background <span class="hlt">noise</span>. Therefore, we investigated the <span class="hlt">noise</span> <span class="hlt">level</span> and estimated the site response at the seismic stations deployed at Mt. Etna and at Aeolian Islands, in order to evidence possible disturbs which can be related to anthropic activity, environmental factors and/or to the local soil conditions. <span class="hlt">Noise</span> measurements were carried out using a portable digital seismic station equipped with a 3-component, 20 s sensor. The acquisition was performed both inside the vault structures where the remote stations are located and in proximity of them, on the outcropping terrain. The <span class="hlt">noise</span> spectra were compared with the NLNM (New Low <span class="hlt">Noise</span> Model) and NHNM (New High <span class="hlt">Noise</span> Model) models described by Peterson (1993). A preliminary estimate of site response at each station, by applying the Nakamura (1989) technique, was also performed. The obtained results show, for some stations, higher <span class="hlt">noise</span> <span class="hlt">levels</span> mainly due to volcanic tremor and/or bad soil conditions. Moreover, in several cases, vault design need to be deeply reviewed and for some installations the substitution of the sites is required. References Nakamura, Y., (1989). A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. Quarterly R of Report RTRI, 30, 25-33. Peterson, J., (1993). Observations and modelling of background seismic <span class="hlt">noise</span>. Open File Report 93-322, U. S. Geological Survey, Albuquerque, NM.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016SPIE10155E..3JN','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016SPIE10155E..3JN"><span>Object reconstruction from thermal and shot <span class="hlt">noises</span> corrupted block-based compressive ultra-low-light-<span class="hlt">level</span> imaging measurements</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Niu, Sen; Ke, Jun</p> <p>2016-10-01</p> <p>In this paper, block-based compressive ultra low-light-<span class="hlt">level</span> imaging (BCU-imaging) is studied. Objects are divided into blocks. Features, or linear combinations of block pixels, instead of pixels, are measured for each block to improve system measurement SNR and thus object reconstructions. Thermal <span class="hlt">noise</span> and shot <span class="hlt">noise</span> are discussed for object reconstruction. The former is modeled as Gaussian <span class="hlt">noise</span>. The latter is modeled as Poisson <span class="hlt">noise</span>. Linear Wiener operator and linearized iterative Bregman algorithm are used to reconstruct objects from measurements corrupted by thermal <span class="hlt">noise</span>. SPIRAL algorithm is used to reconstruct object from measurements with shot <span class="hlt">noise</span>. Linear Wiener operator is also studied for measurements with shot <span class="hlt">noise</span>, because Poisson <span class="hlt">noise</span> is similar to Gaussian <span class="hlt">noise</span> at large signal <span class="hlt">level</span> and feature values are large enough to make this assumption feasible. Root mean square error (RMSE) is used to quantify system reconstruction quality.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/3726297','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/3726297"><span>[The <span class="hlt">level</span> of the musical loud sound and <span class="hlt">noise</span> induced hearing impairment].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ono, H; Deguchi, T; Ino, T; Okamoto, K; Takyu, H</p> <p>1986-03-20</p> <p> examined the relationship between these loud sound and <span class="hlt">noise</span> induced temporary threshold shift (NITTS) in discotheques and <span class="hlt">noise</span> proof room using simulation of loud sound exposure. Moreover, we measured the most comfortable loudness <span class="hlt">level</span> of head phones in each examine and different types of music with environmental <span class="hlt">noise</span> in consideration, thus examining the relationship between musical loud sound and the hearing impairment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70045080','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70045080"><span>Temporal variations in Global Seismic Stations ambient <span class="hlt">noise</span> power <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Ringler, A.T.; Gee, L.S.; Hutt, C.R.; McNamara, D.E.</p> <p>2010-01-01</p> <p>Recent concerns about time-dependent response changes in broadband seismometers have motivated the need for methods to monitor sensor health at Global Seismographic Network (GSN) stations. We present two new methods for monitoring temporal changes in data quality and instrument response transfer functions that are independent of Earth seismic velocity and attenuation models by comparing power <span class="hlt">levels</span> against different baseline values. Our methods can resolve changes in both horizontal and vertical components in a broad range of periods (∼0.05 to 1,000 seconds) in near real time. In this report, we compare our methods with existing techniques and demonstrate how to resolve instrument response changes in long-period data (>100 seconds) as well as in the microseism bands (5 to 20 seconds).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4633185','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4633185"><span>Understanding <span class="hlt">Acceptable</span> <span class="hlt">Level</span> of Risk: Incorporating the Economic Cost of Under-Managing Invasive Species</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Davidson, Alisha D.; Hewitt, Chad L.; Kashian, Donna R.</p> <p>2015-01-01</p> <p>Management of nonindigenous species includes prevention, early detection and rapid response and control. Early detection and rapid response depend on prioritizing and monitoring sites at risk for arrival or secondary spread of nonindigenous species. Such monitoring efforts require sufficient biosecurity budgets to be effective and meet management or policy directives for reduced risk of introduction. Such consideration of risk reduction is rarely considered, however. Here, we review the concepts of <span class="hlt">acceptable</span> <span class="hlt">level</span> of risk (ALOR) and associated costs with respect to nonindigenous species and present a framework for aligning risk reduction priorities with available biosecurity resources. We conclude that available biosecurity resources may be insufficient to attain stated and desired risk reduction. This outcome highlights the need to consider policy and management directives when beginning a biosecurity program to determine the feasibility of risk reduction goals, given available resources. PMID:26536244</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000SPIE.4022..116V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000SPIE.4022..116V"><span>Just <span class="hlt">acceptable</span> and desirable luminance <span class="hlt">levels</span> for fast jet cockpit displays</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vassie, C. Ken; Christopher, W. Colin</p> <p>2000-08-01</p> <p>This paper reports on the experiments undertaken by BAE SYSTEMS to determine the 'just <span class="hlt">acceptable</span>' and 'desirable' luminance <span class="hlt">levels</span> for graphical displays utilized in fast jet cockpits. The assessments of the displays were performed by BAE SYSTEMS test pilots. The results of the experiments are only fully applicable to displays which have the same reflectivity and black contrast as that of the display used during the assessment. The PJND (Perceived Must Noticeable) method was utilized to extend the results of the experiments to apply to displays with any combination of reflectivity and black contrast. The experiment involved both computer generated imagery and sensor imagery; as would be expected the luminance requirements for sensor imagery is far higher than it is for non-sensor imagery.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/22250719','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/22250719"><span>Adaptive nonlocal means filtering based on local <span class="hlt">noise</span> <span class="hlt">level</span> for CT denoising</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Li, Zhoubo; Trzasko, Joshua D.; Lake, David S.; Blezek, Daniel J.; Manduca, Armando; Yu, Lifeng; Fletcher, Joel G.; McCollough, Cynthia H.</p> <p>2014-01-15</p> <p>Purpose: To develop and evaluate an image-domain <span class="hlt">noise</span> reduction method based on a modified nonlocal means (NLM) algorithm that is adaptive to local <span class="hlt">noise</span> <span class="hlt">level</span> of CT images and to implement this method in a time frame consistent with clinical workflow. Methods: A computationally efficient technique for local <span class="hlt">noise</span> estimation directly from CT images was developed. A forward projection, based on a 2D fan-beam approximation, was used to generate the projection data, with a <span class="hlt">noise</span> model incorporating the effects of the bowtie filter and automatic exposure control. The <span class="hlt">noise</span> propagation from projection data to images was analytically derived. The analytical <span class="hlt">noise</span> map was validated using repeated scans of a phantom. A 3D NLM denoising algorithm was modified to adapt its denoising strength locally based on this <span class="hlt">noise</span> map. The performance of this adaptive NLM filter was evaluated in phantom studies in terms of in-plane and cross-plane high-contrast spatial resolution, <span class="hlt">noise</span> power spectrum (NPS), subjective low-contrast spatial resolution using the American College of Radiology (ACR) accreditation phantom, and objective low-contrast spatial resolution using a channelized Hotelling model observer (CHO). Graphical processing units (GPU) implementation of this <span class="hlt">noise</span> map calculation and the adaptive NLM filtering were developed to meet demands of clinical workflow. Adaptive NLM was piloted on lower dose scans in clinical practice. Results: The local <span class="hlt">noise</span> <span class="hlt">level</span> estimation matches the <span class="hlt">noise</span> distribution determined from multiple repetitive scans of a phantom, demonstrated by small variations in the ratio map between the analytical <span class="hlt">noise</span> map and the one calculated from repeated scans. The phantom studies demonstrated that the adaptive NLM filter can reduce <span class="hlt">noise</span> substantially without degrading the high-contrast spatial resolution, as illustrated by modulation transfer function and slice sensitivity profile results. The NPS results show that adaptive NLM denoising preserves the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9643E..08P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9643E..08P"><span>The ground prototype processor: <span class="hlt">Level</span>-1 production during Sentinel-2 in-orbit <span class="hlt">acceptance</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Petrucci, B.; Dechoz, C.; Lachérade, S.; L'Helguen, C.; Raynaud, J.-L.; Trémas, T.; Picard, C.; Rolland, A.</p> <p>2015-10-01</p> <p>Jointly with the European Commission, the Sentinel-2 earth observation optical mission is developed by the European Space Agency (ESA). Relying on a constellation of satellites put in orbit starting mid-2015, Sentinel-2 will be devoted to the monitoring of land and coastal areas worldwide thanks to an imagery at high revisit (5 days with two satellites), high resolution (10m, 20m and 60m) with large swath (290km), and multi-spectral imagery (13 bands in visible and shortwave infra-red). In this framework, the French Space Agency (CNES: Centre National d'Etudes Spatiales) supports ESA on the activities related to Image Quality, defining the image products and prototyping the processing techniques. Scope of this paper is to present the Ground Prototype Processor (GPP) that will be in charge of <span class="hlt">Level</span>-1 production during Sentinel-2 In Orbit <span class="hlt">Acceptance</span> phase. GPP has been developed by a European industrial consortium composed of Advanced Computer Systems (ACS), Magellium and DLR on the basis of CNES technical specification of Sentinel-2 data processing and under the joint management of ESA-ESTEC and CNES. It will assure the generation of the products used for Calibration and Validation activities and it will provide the reference data for Sentinel-2 Payload Data Ground Segment Validation. At first, Sentinel-2 end-users products definition is recalled with the associated radiometric and geometric performances; secondly the methods implemented will be presented with an overview of the Ground Image Processing Parameters that need to be tuned during the In Orbit <span class="hlt">Acceptance</span> phase to assure the required performance of the products. Finally, the complexity of the processing having been showed, the challenges of the production in terms of data volume and processing time will be highlighted. The first Sentinel-2 <span class="hlt">Level</span>-1 products are shown.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27655177','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27655177"><span>Awareness and Knowledge <span class="hlt">Levels</span> of Turkish College Students about Human Papilloma Virus Infection and Vaccine <span class="hlt">Acceptance</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Oz, Murat; Cetinkaya, Nilufer; Apaydin, Aysen; Korkmaz, Elmas; Bas, Sevda; Ozgu, Emre; Gungor, Tayfun</p> <p>2016-09-21</p> <p>Awareness of HPV by the target population is an important determinant of vaccine <span class="hlt">acceptance</span>. The aim of this study is to evaluate the awareness of HPV infection and <span class="hlt">acceptability</span> of the HPV vaccines among Turkish college students. College students aged 18-30 who were attending a large public university in Ankara participated in this study. The participants were asked to complete a questionnaire to elicit demographic characteristics, awareness <span class="hlt">level</span> of HPV and HPV vaccine, and willingness to be vaccinated. One thousand one hundred sixty students responded to the invitation email and completed the questionnaire. The mean scores of female students about HPV and HPV vaccine were 7.1/15 and 3.6/9, respectively, while these scores were 7.9/15 and 3.4/9 among male students, respectively. While 51 % percent of female and 33.5 % of male students had heard of HPV and 32.8 % and 18 % of them had heard of HPV vaccine, respectively, only 1.5 % of female and 0.4 % of male students had been vaccinated against HPV. A total of 507 students (43.7 %) had previously heard of HPV. Only 309 (26.6 %) of the participants had previously heard of the HPV vaccine, and 45.1 % of the students were willing to receive HPV vaccination. The main predictors for willingness to be vaccinated were the following: sexual experience, sexual behavior, past history of sexually transmitted infection (STI), and knowledge about HPV and HPV vaccine. Higher awareness <span class="hlt">levels</span> of HPV and HPV vaccine are significantly related to greater willingness to be vaccinated, and the main reasons for rejecting the vaccine were insufficient information about the vaccine and possible unknown side effects.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016SPIE.9689E..2IC','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016SPIE.9689E..2IC"><span>Combination therapy using antioxidants and low <span class="hlt">level</span> laser therapy (LLLT) on <span class="hlt">noise</span> induced hearing loss (NIHL)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chang, So-Young; Lim, Sung Kyu; Lee, Min young; Chung, Phil-Sang; Jung, Jae-Yun; Rhee, Chung-Ku</p> <p>2016-02-01</p> <p>One of the most common factors that cause hearing disorders is <span class="hlt">noise</span> trauma. <span class="hlt">Noise</span> is an increasing hazard and it is pervasive, which makes it difficult to take precautions and prevent <span class="hlt">noise</span>-induced hearing loss (NIHL). The prevalence of hearing loss among factory workers to be 42 %[1]. Ocupational <span class="hlt">noise</span> induced hearing loss (ONIHL) continues to be a significant occupational hazard. ONIHL is permanent and may cause significant disability, for which there currently exists no cure, but is largely preventable. More than 30 million Americans are potentially exposed to hazardous <span class="hlt">noise</span> <span class="hlt">levels</span> in occupations such as transportation, construction, and coal mining, as well as recreationally. In the mainstream setting, exposure avoidance strategies aimed to reduce the incidence of ONIHL remain the focus of public health and occupational medicine approaches[2]. In military conditions this is most often caused by such things as explosions, blasts, or loud <span class="hlt">noises</span> from vehicles ranging from 100 to 140 dB[3] and military weapons generating approximately 140-185 dB peak sound pressure <span class="hlt">levels</span>[4].</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25825390','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25825390"><span>Pink <span class="hlt">Noise</span> in Rowing Ergometer Performance and the Role of Skill <span class="hlt">Level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Den Hartigh, Ruud J; Cox, Ralf F; Gernigon, Christophe; Van Yperen, Nico W; Van Geert, Paul L</p> <p>2015-03-27</p> <p>The aim of this study was to examine (1) the temporal structures of variation in rowers' (natural) ergometer strokes in order to make inferences about the underlying motor organization, and (2) the relation between these temporal structures and skill <span class="hlt">level</span>. Four high-skilled and five lower-skilled rowers completed 550 strokes on a rowing ergometer. Detrended Fluctuation Analysis was used to quantify the temporal structure of the intervals between force peaks. Results showed that the temporal structure differed from random, and revealed prominent patterns of pink <span class="hlt">noise</span> for each rower. Furthermore, the high-skilled rowers demonstrated more pink <span class="hlt">noise</span> than the lower-skilled rowers. The presence of pink <span class="hlt">noise</span> suggests that rowing performance emerges from the coordination among interacting component processes across multiple time scales. The difference in <span class="hlt">noise</span> pattern between high-skilled and lower-skilled athletes indicates that the complexity of athletes' motor organization is a potential key characteristic of elite performance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26559647','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26559647"><span>Pink <span class="hlt">Noise</span> in Rowing Ergometer Performance and the Role of Skill <span class="hlt">Level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Den Hartigh, Ruud J R; Cox, Ralf F A; Gernigon, Christophe; Van Yperen, Nico W; Van Geert, Paul L C</p> <p>2015-10-01</p> <p>The aim of this study was to examine (1) the temporal structures of variation in rowers’ (natural) ergometer strokes to make inferences about the underlying motor organization, and (2) the relation between these temporal structures and skill <span class="hlt">level</span>. Four high-skilled and five lower-skilled rowers completed 550 strokes on a rowing ergometer. Detrended Fluctuation Analysis was used to quantify the temporal structure of the intervals between force peaks. Results showed that the temporal structure differed from random, and revealed prominent patterns of pink <span class="hlt">noise</span> for each rower. Furthermore, the high-skilled rowers demonstrated more pink <span class="hlt">noise</span> than the lower-skilled rowers. The presence of pink <span class="hlt">noise</span> suggeststhat rowing performance emerges from the coordination among interacting component processes across multiple time scales. The difference in <span class="hlt">noise</span> pattern between high-skilled and lower-skilled athletes indicates that the complexity of athletes’ motor organization is a potential key characteristic of elite performance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19890031543&hterms=advancing+blade&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dadvancing%2Bblade','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19890031543&hterms=advancing+blade&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dadvancing%2Bblade"><span>Tip-path-plane angle effects on rotor blade-vortex interaction <span class="hlt">noise</span> <span class="hlt">levels</span> and directivity</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Burley, Casey L.; Martin, Ruth M.</p> <p>1988-01-01</p> <p>Acoustic data of a scale model BO-105 main rotor acquired in a large aeroacoustic wind tunnel are presented to investigate the parametric effects of rotor operating conditions on blade-vortex interaction (BVI) impulsive <span class="hlt">noise</span>. Contours of a BVI <span class="hlt">noise</span> metric are employed to quantify the effects of rotor advance ratio and tip-path-plane angle on BVI <span class="hlt">noise</span> directivity and amplitude. Acoustic time history data are presented to illustrate the variations in impulsive characteristics. The directionality, <span class="hlt">noise</span> <span class="hlt">levels</span> and impulsive content of both advancing and retreating side BVI are shown to vary significantly with tip-path-plane angle and advance ratio over the range of low and moderate flight speeds considered.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26611055','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26611055"><span>Impact of Anthropogenic <span class="hlt">Noise</span> on Aquatic Animals: From Single Species to Community-<span class="hlt">Level</span> Effects.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sabet, Saeed Shafiei; Neo, Yik Yaw; Slabbekoorn, Hans</p> <p>2016-01-01</p> <p>Anthropogenic <span class="hlt">noise</span> underwater is on the rise and may affect aquatic animals of marine and freshwater ecosystems. Many recent studies concern some sort of impact assessment of a single species. Few studies addressed the <span class="hlt">noise</span> impact on species interactions underwater, whereas there are some studies that address community-<span class="hlt">level</span> impact but only on land in air. Key processes such as predator-prey or competitor interactions may be affected by the masking of auditory cues, <span class="hlt">noise</span>-related disturbance, or attentional interference. <span class="hlt">Noise</span>-associated changes in these interactions can cause shifts in species abundance and modify communities, leading to fundamental ecosystem changes. To gain further insight into the mechanism and generality of earlier findings, we investigated the impact on both a predator and a prey species in captivity, zebrafish (Danio rerio) preying on waterfleas (Daphnia magna).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17902830','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17902830"><span>Prediction of <span class="hlt">noise</span> <span class="hlt">levels</span> and annoyance from aircraft run-ups at Vancouver International Airport.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Scherebnyj, Katrina; Hodgson, Murray</p> <p>2007-10-01</p> <p>Annoyance complaints resulting from engine run-ups have been increasing at Vancouver International Airport for several years. To assist the Airport in managing run-up <span class="hlt">noise</span> <span class="hlt">levels</span>, a prediction tool based on a Green's function parabolic equation (GFPE) model has been consolidated, evaluated, and applied. It was extended to include more realistic atmospheric and ground input parameters. Measurements were made of the <span class="hlt">noise</span>-radiation characteristics of a CRJ200 jet aircraft. The GFPE model was validated by comparing predictions with results in the literature. A sensitivity analysis showed that predicted <span class="hlt">levels</span> are relatively insensitive to small variations in geometry and ground impedance, but relatively sensitive to variations in wind speed, atmosphere type, and aircraft heading and power setting. Predicted <span class="hlt">noise</span> <span class="hlt">levels</span> were compared with <span class="hlt">levels</span> measured at <span class="hlt">noise</span> monitoring terminals. For the four cases for which all input information was available, agreement was within 10 dBA. For events for which some information had to be estimated, predictions were within 20 dBA. The predicted annoyance corresponding to the run-up events considered ranged from 1.8% to 9.5% of people awoken, suggesting that <span class="hlt">noise</span> complaints can be expected.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008Chaos..18b3115J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008Chaos..18b3115J"><span>A method of estimating the <span class="hlt">noise</span> <span class="hlt">level</span> in a chaotic time series</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jayawardena, A. W.; Xu, Pengcheng; Li, W. K.</p> <p>2008-06-01</p> <p>An attempt is made in this study to estimate the <span class="hlt">noise</span> <span class="hlt">level</span> present in a chaotic time series. This is achieved by employing a linear least-squares method that is based on the correlation integral form obtained by Diks in 1999. The effectiveness of the method is demonstrated using five artificial chaotic time series, the Hénon map, the Lorenz equation, the Duffing equation, the Rossler equation and the Chua's circuit whose dynamical characteristics are known a priori. Different <span class="hlt">levels</span> of <span class="hlt">noise</span> are added to the artificial chaotic time series and the estimated results indicate good performance of the proposed method. Finally, the proposed method is applied to estimate the <span class="hlt">noise</span> <span class="hlt">level</span> present in some real world data sets.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002ASAJ..111.2441B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002ASAJ..111.2441B"><span>School cafeteria <span class="hlt">noise</span>-The impact of room acoustics and speech intelligibility on children's voice <span class="hlt">levels</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bridger, Joseph F.</p> <p>2002-05-01</p> <p>The impact of room acoustics and speech intelligibility conditions of different school cafeterias on the voice <span class="hlt">levels</span> of children is examined. Methods of evaluating cafeteria designs and predicting <span class="hlt">noise</span> <span class="hlt">levels</span> are discussed. Children are shown to modify their voice <span class="hlt">levels</span> with changes in speech intelligibility like adults. Reverberation and signal to <span class="hlt">noise</span> ratio are the important acoustical factors affecting speech intelligibility. Children have much more difficulty than adults in conditions where <span class="hlt">noise</span> and reverberation are present. To evaluate the relationship of voice <span class="hlt">level</span> and speech intelligibility, a database of real sound <span class="hlt">levels</span> and room acoustics data was generated from measurements and data recorded during visits to a variety of existing cafeterias under different occupancy conditions. The effects of speech intelligibility and room acoustics on childrens voice <span class="hlt">levels</span> are demonstrated. A new method is presented for predicting speech intelligibility conditions and resulting <span class="hlt">noise</span> <span class="hlt">levels</span> for the design of new cafeterias and renovation of existing facilities. Measurements are provided for an existing school cafeteria before and after new room acoustics treatments were added. This will be helpful for acousticians, architects, school systems, regulatory agencies, and Parent Teacher Associations to create less noisy cafeteria environments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24197556','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24197556"><span>Measurement and evaluation of the environmental <span class="hlt">noise</span> <span class="hlt">levels</span> in the urban areas of the city of Nis (Serbia).</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Prascevic, Momir R; Mihajlov, Darko I; Cvetkovic, Dragan S</p> <p>2014-02-01</p> <p>The environmental <span class="hlt">noise</span> <span class="hlt">level</span> represents one of the key factors of life quality in urban areas of modern cities. A continuous monitoring of the <span class="hlt">noise</span> <span class="hlt">levels</span> and the analysis of results have become a necessity when we discuss a possible recovery of those areas with high <span class="hlt">levels</span> of <span class="hlt">noise</span> pollution, and particularly, those zones which were designed for specific activities, e.g., areas around hospitals and schools. The city of Nis, Serbia, owing to the permanent long-term <span class="hlt">noise</span> monitoring, possesses a database containing figures related to the <span class="hlt">noise</span> <span class="hlt">levels</span> at relevant locations in the city, which can serve as a basis for an analysis of the change of conditions, their tendencies in the future, and recognizing factors which influence the danger of <span class="hlt">noise</span> pollution. The paper involves an analysis of the environmental <span class="hlt">noise</span> <span class="hlt">level</span> collected during the previous years.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800014613','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800014613"><span>An exploratory survey of <span class="hlt">noise</span> <span class="hlt">levels</span> associated with a 100kW wind turbine</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Balombin, J. R.</p> <p>1980-01-01</p> <p><span class="hlt">Noise</span> measurements of a 125-foot diameter, 100 kW wind turbine are presented. The data include measurements as functions of distance from the turbine and directivity angle and cover a frequency range from 1 Hz to several kHz. Potential community impact is discussed in terms of A-weighted <span class="hlt">noise</span> <span class="hlt">levels</span> relative to background <span class="hlt">levels</span>, and the intrasonic spectral content. Finally, the change in the sound power spectrum associated with a change in the rotor speed in described. The acoustic impact of this size wind turbine is judged to be minimal.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012EGUGA..14.1301K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012EGUGA..14.1301K"><span>Gamma-magnetic normalization - new effect to reduce flux-gate magnetometer <span class="hlt">noise</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Korepanov, V.</p> <p>2012-04-01</p> <p>It is the author's opinion confirmed by numerous experiments, that the FGM <span class="hlt">noise</span> <span class="hlt">level</span> (NL) is determined not by Barkhausen jumps during the core remagnetization from positive to negative state as the majority of designers believe, but by non-repeatability of the magnetic domains transition from negative to positive states and back. This shows the way how to reduce the magnetic <span class="hlt">noise</span>: to manufacture the magnetic material with a structure which will create conditions for magnetic domain walls to glide easily and uniformly when changing their orientation leading to minimal efforts at cyclic remagnetization. Ideally, such a material may be represented as a solid "liquid" with freely floating uniform magnetic domains without walls friction. To reduce the specific NL of the materials, several post-melting processing technologies were developed. A set of experiments made by many investigators has shown that the best results gives the magnetic materials annealing in vacuum or in any inert gas applying by this during all annealing time the alternative magnetic field, imitating core excitation field during FGM operation. If to <span class="hlt">accept</span> the "solid liquid" model, this mechanism of NL decreasing has clear physical explanation: permanent re-magnetization of domains leads to the structural improvements favorable namely for the homogenization of transitions, rise of temperature gives necessary energy for the impurities liquidation. Probably, M. Acuna was the first who reported that during FGM operation in space its NL is decreasing with time and attributed this to the relaxation of mechanical stresses in the core material in weightlessness conditions [1]. We studied in details the conditions in which the core material is in space: weightlessness, vacuum and radiation. Mechanical stresses relaxation hypothesis was rejected because the internal forces in any solid body are much stronger as those to which a gravity force might have influence. Also the tests of FGM sensor in vacuum</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970004793','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970004793"><span>The Influences of Lamination Angles on the Interior <span class="hlt">Noise</span> <span class="hlt">Levels</span> of an Aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fernholz, Christian M.; Robinson, Jay H.</p> <p>1996-01-01</p> <p>The feasibility of reducing the interior <span class="hlt">noise</span> <span class="hlt">levels</span> of an aircraft passenger cabin through optimization of the composite lay up of the fuselage is investigated. MSC/NASTRAN, a commercially available finite element code, is used to perform the dynamic analysis and subsequent optimization of the fuselage. The numerical calculation of sensitivity of acoustic pressure to lamination angle is verified using a simple thin, cylindrical shell with point force excitations as <span class="hlt">noise</span> sources. The thin shell used represents a geometry similar to the fuselage and analytic solutions are available for the cylindrical thin shell equations of motion. Optimization of lamination angle for the reduction of interior <span class="hlt">noise</span> is performed using a finite element model of an actual aircraft fuselage. The aircraft modeled for this study is the Beech Starship. Point forces simulate the structure borne <span class="hlt">noise</span> produced by the engines and are applied to the fuselage at the wing mounting locations. These forces are the <span class="hlt">noise</span> source for the optimization problem. The acoustic pressure response is reduced at a number of points in the fuselage and over a number of frequencies. The objective function is minimized with the constraint that it be larger than the maximum sound pressure <span class="hlt">level</span> at the response points in the passenger cabin for all excitation frequencies in the range of interest. Results from the study of the fuselage model indicate that a reduction in interior <span class="hlt">noise</span> <span class="hlt">levels</span> is possible over a finite frequency range through optimal configuration of the lamination angles in the fuselage. <span class="hlt">Noise</span> reductions of roughly 4 dB were attained. For frequencies outside the optimization range, the acoustic pressure response may increase after optimization. The effects of changing lamination angle on the overall structural integrity of the airframe are not considered in this study.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.usgs.gov/of/1989/0214/report.pdf','USGSPUBS'); return false;" href="https://pubs.usgs.gov/of/1989/0214/report.pdf"><span>A Direct Method for Calculating Instrument <span class="hlt">Noise</span> <span class="hlt">Levels</span> in Side-by-Side Seismometer Evaluations</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Holcomb, L. Gary</p> <p>1989-01-01</p> <p>INTRODUCTION The subject of determining the inherent system <span class="hlt">noise</span> <span class="hlt">levels</span> present in modem broadband closed loop seismic sensors has been an evolving topic ever since closed loop systems became available. Closed loop systems are unique in that the system <span class="hlt">noise</span> can not be determined via a blocked mass test as in older conventional open loop seismic sensors. Instead, most investigators have resorted to performing measurements on two or more systems operating in close proximity to one another and to analyzing the outputs of these systems with respect to one another to ascertain their relative <span class="hlt">noise</span> <span class="hlt">levels</span>. The analysis of side-by-side relative performance is inherently dependent on the accuracy of the mathematical modeling of the test configuration. This report presents a direct approach to extracting the system <span class="hlt">noise</span> <span class="hlt">levels</span> of two linear systems with a common coherent input signal. The mathematical solution to the problem is incredibly simple; however the practical application of the method encounters some difficulties. Examples of expected accuracies are presented as derived by simulating real systems performance using computer generated random <span class="hlt">noise</span>. In addition, examples of the performance of the method when applied to real experimental test data are shown.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009AGUSM.B13C..11S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009AGUSM.B13C..11S"><span>Modeling canopy-<span class="hlt">level</span> productivity: is the "big-leaf" simplification <span class="hlt">acceptable</span>?</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sprintsin, M.; Chen, J. M.</p> <p>2009-05-01</p> <p>The "big-leaf" approach to calculating the carbon balance of plant canopies assumes that canopy carbon fluxes have the same relative responses to the environment as any single unshaded leaf in the upper canopy. Widely used light use efficiency models are essentially simplified versions of the big-leaf model. Despite its wide <span class="hlt">acceptance</span>, subsequent developments in the modeling of leaf photosynthesis and measurements of canopy physiology have brought into question the assumptions behind this approach showing that big leaf approximation is inadequate for simulating canopy photosynthesis because of the additional leaf internal control on carbon assimilation and because of the non-linear response of photosynthesis on leaf nitrogen and absorbed light, and changes in leaf microenvironment with canopy depth. To avoid this problem a sunlit/shaded leaf separation approach, within which the vegetation is treated as two big leaves under different illumination conditions, is gradually replacing the "big-leaf" strategy, for applications at local and regional scales. Such separation is now widely <span class="hlt">accepted</span> as a more accurate and physiologically based approach for modeling canopy photosynthesis. Here we compare both strategies for Gross Primary Production (GPP) modeling using the Boreal Ecosystem Productivity Simulator (BEPS) at local (tower footprint) scale for different land cover types spread over North America: two broadleaf forests (Harvard, Massachusetts and Missouri Ozark, Missouri); two coniferous forests (Howland, Maine and Old Black Spruce, Saskatchewan); Lost Creek shrubland site (Wisconsin) and Mer Bleue petland (Ontario). BEPS calculates carbon fixation by scaling Farquhar's leaf biochemical model up to canopy <span class="hlt">level</span> with stomatal conductance estimated by a modified version of the Ball-Woodrow-Berry model. The "big-leaf" approach was parameterized using derived leaf <span class="hlt">level</span> parameters scaled up to canopy <span class="hlt">level</span> by means of Leaf Area Index. The influence of sunlit</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/6192992','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/6192992"><span>Wideband <span class="hlt">noise</span> observed at ground-<span class="hlt">level</span> in the auroral region</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Benson, R.F.; Desch, M.D.</p> <p>1990-05-03</p> <p>A wideband <span class="hlt">noise</span> event was detected at ground <span class="hlt">level</span> from the Andoya Rocket Range in Norway in January 1989. The signals were observed using 4 commercial communication receivers (tuned to 159, 515, 905 and 1200 kHz), an ionosonde (200 kHz to 3.5 MHz interference-free observations) and a riometer (32.5 MHz). The event, which occurred during a period of magnetic disturbance near magnetic midnight, was the only one observed during nearly 3 weeks of operations. This low frequency-of-occurrence is attributed partly to high local <span class="hlt">noise</span> <span class="hlt">levels</span>. The ease with which this event was identified on the ionograms produced by the local ionosonde suggests that routine ionosonde recordings should be inspected in search for such events. Such an effort would enhance existing research directed toward developing techniques for identifying quiet communication channels and help to identify the origin and frequency-of-occurrence of high latitude wideband <span class="hlt">noise</span> events.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016PhRvB..94w5429S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016PhRvB..94w5429S"><span>Shot <span class="hlt">noise</span> in magnetic tunneling structures with two-<span class="hlt">level</span> quantum dots</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Szczepański, T.; Dugaev, V. K.; Barnaś, J.; Martinez, I.; Cascales, J. P.; Hong, J.-Y.; Lin, M.-T.; Aliev, F. G.</p> <p>2016-12-01</p> <p>We analyze shot <span class="hlt">noise</span> in a magnetic tunnel junction with a two-<span class="hlt">level</span> quantum dot attached to the magnetic electrodes. The considerations are limited to the case when some transport channels are suppressed at low temperatures. Coupling of the two dot's <span class="hlt">levels</span> to the electrodes are assumed to be generally different and also spin dependent. To calculate the shot <span class="hlt">noise</span> we apply the approach based on the full counting statistics. The approach is used to account for experimental data obtained in magnetic tunnel junctions with organic barriers. The experimentally observed Fano factors correspond to the super-Poissonian statistics, and also depend on relative orientation of the electrodes' magnetic moments. We have also calculated the corresponding spin shot <span class="hlt">noise</span>, which is associated with fluctuations of spin current.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23556567','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23556567"><span>Underwater radiated <span class="hlt">noise</span> <span class="hlt">levels</span> of a research icebreaker in the central Arctic Ocean.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Roth, Ethan H; Schmidt, Val; Hildebrand, John A; Wiggins, Sean M</p> <p>2013-04-01</p> <p>U.S. Coast Guard Cutter Healy's underwater radiated <span class="hlt">noise</span> signature was characterized in the central Arctic Ocean during different types of ice-breaking operations. Propulsion modes included transit in variable ice cover, breaking heavy ice with backing-and-ramming maneuvers, and dynamic positioning with the bow thruster in operation. Compared to open-water transit, Healy's <span class="hlt">noise</span> signature increased approximately 10 dB between 20 Hz and 2 kHz when breaking ice. The highest <span class="hlt">noise</span> <span class="hlt">levels</span> resulted while the ship was engaged in backing-and-ramming maneuvers, owing to cavitation when operating the propellers astern or in opposing directions. In frequency bands centered near 10, 50, and 100 Hz, source <span class="hlt">levels</span> reached 190-200 dB re: 1 μPa at 1 m (full octave band) during ice-breaking operations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17672659','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17672659"><span>Intelligibility of speech in <span class="hlt">noise</span> at high presentation <span class="hlt">levels</span>: effects of hearing loss and frequency region.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Summers, Van; Cord, Mary T</p> <p>2007-08-01</p> <p>These experiments examined how high presentation <span class="hlt">levels</span> influence speech recognition for high- and low-frequency stimuli in <span class="hlt">noise</span>. Normally hearing (NH) and hearing-impaired (HI) listeners were tested. In Experiment 1, high- and low-frequency bandwidths yielding 70%-correct word recognition in quiet were determined at <span class="hlt">levels</span> associated with broadband speech at 75 dB SPL. In Experiment 2, broadband and band-limited sentences (based on passbands measured in Experiment 1) were presented at this <span class="hlt">level</span> in speech-shaped <span class="hlt">noise</span> filtered to the same frequency bandwidths as targets. <span class="hlt">Noise</span> <span class="hlt">levels</span> were adjusted to produce approximately 30%-correct word recognition. Frequency bandwidths and signal-to-<span class="hlt">noise</span> ratios supporting criterion performance in Experiment 2 were tested at 75, 87.5, and 100 dB SPL in Experiment 3. Performance tended to decrease as <span class="hlt">levels</span> increased. For NH listeners, this "rollover" effect was greater for high-frequency and broadband materials than for low-frequency stimuli. For HI listeners, the 75- to 87.5-dB increase improved signal audibility for high-frequency stimuli and rollover was not observed. However, the 87.5- to 100-dB increase produced qualitatively similar results for both groups: scores decreased most for high-frequency stimuli and least for low-frequency materials. Predictions of speech intelligibility by quantitative methods such as the Speech Intelligibility Index may be improved if rollover effects are modeled as frequency dependent.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19780025930','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19780025930"><span>Comparison of low-frequency <span class="hlt">noise</span> <span class="hlt">levels</span> of the Concorde supersonic transport with other commercial service airplanes</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Powell, C. A.; Mccurdy, D. A.</p> <p>1978-01-01</p> <p>Fifty-two airplane <span class="hlt">noise</span> recordings, made at several locations around Dulles International Airport, were analyzed to compare the low-frequency <span class="hlt">noise</span> <span class="hlt">levels</span> of the Concorde supersonic transport with those of other commercial jet airplanes. Comparisons of the relative low-frequency <span class="hlt">noise</span> <span class="hlt">levels</span> which were produced at close and distant locations for departures and arrivals were made for three <span class="hlt">noise</span> measures: the sound pressure <span class="hlt">level</span> in the 1/3 octave band centered at 20 Hz, the total sound pressure <span class="hlt">level</span> in the 1/3 octave bands with center frequencies less than or equal to 125 Hz, and the total sound pressure <span class="hlt">level</span> in the 1/3 octave bands with center frequencies less than or equal to 500 Hz. Although the absolute <span class="hlt">noise</span> <span class="hlt">levels</span> for Concorde were found, in general, to be higher than those for the other airplane types, the <span class="hlt">level</span> of low-frequency <span class="hlt">noise</span> of the Concorde relative to the perceived <span class="hlt">noise</span> <span class="hlt">level</span> (PNL), effective perceived <span class="hlt">noise</span> <span class="hlt">level</span> (EPNL), and overall sound pressure <span class="hlt">level</span> (OASPL) was within the range established by the other airplane types, except for the arrival operations of four-engine, narrow-body airplanes. The measure OASPL was found to be a significantly better predictor of low-frequency <span class="hlt">noise</span> <span class="hlt">level</span> than PNL or EPNL.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFMNS43A1956B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFMNS43A1956B"><span>Processing of Surface-NMR Data From Sites With High <span class="hlt">Noise</span> <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Behroozmand, A. A.; Larsen, J. J.</p> <p>2015-12-01</p> <p>The applicability of surface NMR in investigations of groundwater is often limited by high <span class="hlt">noise</span> <span class="hlt">levels</span> in many areas of interest. In this paper we present measurements from a high <span class="hlt">noise</span> <span class="hlt">level</span> area in Ristrup, Denmark. Standard multichannel filtering techniques for <span class="hlt">noise</span> reduction are inadequate for several data sets acquired in this area and surface-NMR signals cannot be resolved from the acquired data. With a careful assessment of the frequency content of the data, we show how a model-based approach can be used to subtract two harmonic <span class="hlt">noise</span> components from the data and reliable surface-NMR data can be extracted from the <span class="hlt">noise</span>-reduced data. Moreover, we show the impact of the proposed processing approaches on the inversion results and also present an example where the proposed methodology allows us to reveal and avoid an otherwise overlooked contamination of the reference coil signals with surface-NMR signal. The results of this study show that a careful processing of the data makes it possible to extract surface-NMR data in more places of interest.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3819755','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3819755"><span>Relationship between Lighting and <span class="hlt">Noise</span> <span class="hlt">Levels</span> and Productivity of the Occupants in Automotive Assembly Industry</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Akbari, Jafar; Dehghan, Habibollah; Azmoon, Hiva</p> <p>2013-01-01</p> <p>Work environment affects human productivity and his performance. The aims of this study were to investigate the effects of lighting and <span class="hlt">noise</span> <span class="hlt">levels</span> on human productivity in the automotive assembly industry. Method. Subjects were 181 workers from different parts of an automobile assembly industry. Illuminance (Lx) at the height of 30 inches from the surface of work station and <span class="hlt">noise</span> (dBA) were locally measured. Also human productivity by the Goldsmith and Hersey scale (1980) was measured. Data were analyzed by using SPSS v20 Pearson correlation coefficient. Results. The results showed that the relationship between <span class="hlt">noise</span> <span class="hlt">level</span> and human productivity is negative and significant (P < 0.05, r = −0.178), but there was no significant relationship between lighting and human productivity (P > 0.05). Conclusion. Based on the results, in assembly tasks, <span class="hlt">noise</span> has a negative impact on human productivity, and lighting does not affect this. So, in order to increase employee productivity, <span class="hlt">noise</span> control and reduction to less than the standard values (less than 85 dB) is necessary. PMID:24250340</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JMOp...63.2114M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JMOp...63.2114M"><span><span class="hlt">Noise</span> property of a four-<span class="hlt">level</span> system in vee + ladder configuration</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ming, Ying; Liu, Hong-Yu; Yang, Rong-Can</p> <p>2016-11-01</p> <p>We present the results of a theoretical study of the output amplitude <span class="hlt">noises</span> of a four-<span class="hlt">level</span> atomic system in vee + ladder configuration. The difference and connection of electromagnetically induced transparency and Autler-Townes splitting effects are investigated theoretically. The output amplitude <span class="hlt">noise</span> of the probe field of two effects were compared, the quantum properties of the input field of the thin medium and the thick medium under Autler-Townes splitting or electromagnetically induced transparency (EIT) condition are maintained, the higher fidelity is obtained in the storage of the thick medium under the condition of EIT in non-classical states. The <span class="hlt">noise</span> characteristics of the squeezed vacuum field after four-<span class="hlt">level</span> coherent medium are studied; the <span class="hlt">noise</span> of the output field is lowest when the detection light is far away from detuning. The double split of EIT window was made by the dynamic Stark splitting on the ground state of control field, the quantum properties of the input field in the strong-control field and strong-coupling field were maintained. The output <span class="hlt">noise</span> spectrum is divided with the increase in the field strength, the maximum output squeezing is far away from the resonance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19740020268&hterms=mathematical+functions&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dmathematical%2Bfunctions','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19740020268&hterms=mathematical+functions&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dmathematical%2Bfunctions"><span>Load influence on gear <span class="hlt">noise</span>. [mathematical model for determining acoustic pressure <span class="hlt">level</span> as function of load</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Merticaru, V.</p> <p>1974-01-01</p> <p>An original mathematical model is proposed to derive equations for calculation of gear <span class="hlt">noise</span>. These equations permit the acoustic pressure <span class="hlt">level</span> to be determined as a function of load. Application of this method to three parallel gears is reported. The logical calculation scheme is given, as well as the results obtained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19860012834','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19860012834"><span>Airport-<span class="hlt">Noise</span> <span class="hlt">Levels</span> and Annoyance Model (ALAMO) system's reference manual</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Deloach, R.; Donaldson, J. L.; Johnson, M. J.</p> <p>1986-01-01</p> <p>The airport-<span class="hlt">noise</span> <span class="hlt">levels</span> and annoyance model (ALAMO) is described in terms of the constituent modules, the execution of ALAMO procedure files, necessary for system execution, and the source code documentation associated with code development at Langley Research Center. The modules constituting ALAMO are presented both in flow graph form, and through a description of the subroutines and functions that comprise them.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26627791','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26627791"><span>A <span class="hlt">noise</span> delivery system for multi-animal multi-<span class="hlt">level</span> whole body ototoxicity studies.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Stubbs, John E; Slagley, Jeremy M; Reboulet, James E</p> <p>2015-11-01</p> <p>The Naval Medical Research Unit Dayton (NAMRU-D) at Wright-Patterson Air Force Base, Ohio, in conjunction with the U.S. Air Force, studied ototoxic effects of JP-8 in rats. NAMRU-D used a multi-chamber whole body exposure facility for up to 96 test animals and 32 control animals at different exposure <span class="hlt">levels</span>. The objective was to design a <span class="hlt">noise</span> delivery system that could provide a white <span class="hlt">noise</span> source one octave band wide, centered at 8 kHz frequency, delivered from outside the exposure chambers. Sound pressure <span class="hlt">levels</span> were required to be within ±2 dB at all exposure points within each chamber and within ±2 dB over a 6-h run. Electrodynamic shakers were used to produce input <span class="hlt">noise</span> in exposure chambers by inducing vibration in chamber plenums. Distribution of sound pressure <span class="hlt">levels</span> across exposure points was controlled within a ±1.5dB prediction interval (α = 0.05) or better. Stability at a central reference point was controlled over 6-h runs within a ±1 dB prediction interval (α = 0.05) or better. The final system allowed NAMRU-D to deliver <span class="hlt">noise</span> and whole-body aerosol exposures to multiple animals at different <span class="hlt">levels</span> simultaneously and study the effects that ototoxins may have on hearing loss.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/5497145','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/5497145"><span>Ocean dumping of high-<span class="hlt">level</span> waste: an <span class="hlt">acceptable</span> solution we can ''guarantee''</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cohen, B.</p> <p>1980-01-01</p> <p>What is needed for high-<span class="hlt">level</span> radioactive waste is not necessarily a program for final disposal, but rather an early clear demonstration that an <span class="hlt">acceptable</span> method is available. This would be especially easy for ocean dumping, since the environment in the water just above the ocean floor is much more uniform, stable, predictable, and more easily reproduced in a laboratory than other environments being considered for waste storage. Other probable advantages of ocean dumping are improved capability for monitoring and retrievability and reduced cost and transport problems. It is assumed that the waste is incorporated into glass and dumped in oceans distributed throughout the world. Calculations of environmental impacts are given for various assuptions about leach rates and failures and for a 30,000-yr delay in onset of leaching achieved by surrounding the waste with a protective coating. With normal leaching, there would be 0.17 eventual human fatalities per GW(electric)-yr, and for the worst case of immediate complete dissolution, this is increased by only 30%. This is 150 times less than the fatalities due to wastes from coal-fired plants.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940028984','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940028984"><span>Community <span class="hlt">noise</span> technology needs: Boeing's perspective</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Nihart, Gene L.</p> <p>1992-01-01</p> <p>Airport community <span class="hlt">acceptance</span> of High Speed Civil Transport (HSCT) <span class="hlt">noise</span> <span class="hlt">levels</span> will depend on the relative <span class="hlt">noise</span> <span class="hlt">levels</span> of airplanes flying at the time of introduction. The 85 dBA <span class="hlt">noise</span> contours for the range of large subsonic airplanes that are expected to be in service in the early 21st century are shown as a shaded area. A certifiable HSCT <span class="hlt">noise</span> contour as shown, would be somewhat wider along the runway, but about the same in the residential areas downrange. An HSCT <span class="hlt">noise</span> rule should insure this <span class="hlt">noise</span> capability.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA244805','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA244805"><span>Analysis of Measured Environmental <span class="hlt">Noise</span> <span class="hlt">Levels</span>: An Assessment of the Effects of Airbase Operational Model Variables on Predicted <span class="hlt">Noise</span> Exposure <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>1991-06-01</p> <p>measured <span class="hlt">noise</span> data was used in an effort to quantify the complicating factors relevant to airbase enviromental <span class="hlt">noise</span> prediction. These factors are...were used to optimize the operational profiles influencing the <span class="hlt">noise</span> predictions at that location. Some marginal benefit from this effort was realized...Records The McChord measured <span class="hlt">noise</span> data was originally recorded on printed paper tapes. The measured <span class="hlt">noise</span> events’ data were entered into the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840023156','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840023156"><span>Effect of external pressure environment on the internal <span class="hlt">noise</span> <span class="hlt">level</span> due to a source inside a cylindrical tank</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Clevenson, S. A.; Roussos, L. A.</p> <p>1984-01-01</p> <p>A small cylindrical tank was used to study the effect on the <span class="hlt">noise</span> environment within a tank of conditions of atmospheric (sea <span class="hlt">level</span>) pressure or vacuum environments on the exterior. Experimentally determined absorption coefficients were used to calculate transmission loss, transmissibility coefficients and the sound pressure (<span class="hlt">noise</span>) <span class="hlt">level</span> differences in the interior. The <span class="hlt">noise</span> <span class="hlt">level</span> differences were also measured directly for the two exterior environments and compared to various analytical approximations with limited agreement. Trend study curves indicated that if the tank transmission loss is above 25 dB, the difference in interior <span class="hlt">noise</span> <span class="hlt">level</span> between the vacuum and ambient pressure conditions are less than 2 dB.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23955128','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23955128"><span>Distortion product otoacoustic emission <span class="hlt">level</span> maps from normal and <span class="hlt">noise</span>-damaged cochleae.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Meinke, Deanna K; Clavier, Odile H; Norris, Jesse; Kline-Schoder, Robert; Allen, Lindsay; Buckey, Jay C</p> <p>2013-01-01</p> <p>Distortion product otoacoustic emission (DPOAE) <span class="hlt">level</span> mapping may be useful for detecting <span class="hlt">noise</span>-induced hearing loss (NIHL) early. Employing DPOAE mapping effectively requires knowledge of the optimal mapping parameters to use for detecting <span class="hlt">noise</span>-induced changes. The goal of this project was to show the map regions that differ most between normal and <span class="hlt">noise</span>-damaged cochlea to determine the optimal mapping parameters for detecting NIHL. DPOAE <span class="hlt">level</span> maps were generated for the 2f 1 -f 2 and the 2f 2 -f 1 DPOAEs for 17 normal hearing male subjects and 19 male subjects with NIHL. DPOAEs were measured in DPOAE frequency steps of approximately 44 Hz from 0.5 kHz to 6 kHz using constant f 2 /f 1 ratios incremented in 0.025 steps from 1.025 to 1.5 using both unequal-<span class="hlt">level</span> (L1,L2 = 65,55 dB sound pressure <span class="hlt">level</span> (SPL)) and equi-<span class="hlt">level</span> (L1,L2 = 75,75 dB SPL) stimulus paradigms. Maximal responses for the 2f 2 -f 1 emission at L1,L2 = 65,55 dB SPL were found at lower ratios compared to previous studies. The map regions where NIHL eliminated or reduced DPOAE magnitude were identified. DPOAE <span class="hlt">level</span> mapping using higher-<span class="hlt">level</span>, equi-<span class="hlt">level</span> primaries produced significantly more detectable emissions particularly for the 2f 2 -f 1 emission. The data from this study can be used to optimize DPOAE <span class="hlt">level</span> mapping parameters for tracking <span class="hlt">noise</span>-exposed subjects longitudinally.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5354622','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5354622"><span>EVALUATION OF THE ENVIRONMENTAL <span class="hlt">NOISE</span> <span class="hlt">LEVELS</span> IN ABUJA MUNICIPALITY USING MOBILE PHONES</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ibekwe, T.; Folorunso, D.; Ebuta, A.; Amodu, J.; Nwegbu, M.; Mairami, Z.; Liman, I.; Okebaram, C.; Chimdi, C.; Durogbola, B.; Suleiman, H.; Mamven, H.; Baamlong, N.; Dahilo, E.; Gbujie, I.; Ibekwe, P.; Nwaorgu, O.</p> <p>2016-01-01</p> <p>Background: <span class="hlt">Noise</span> remains a nuisance which impacts negatively on the physical, social and psychological wellbeing of man. It aggravates chronic illnesses like hypertension and other cardiopulmonary diseases. Unfortunately, increased activities from industrialization and technological transfers/drifts have tumultuously led to increased <span class="hlt">noise</span> pollution in most of our fast growing cities today and hence the need for concerted efforts in monitoring and regulating our environmental <span class="hlt">noise</span>. Objective: To assess the equivalent <span class="hlt">noise</span> <span class="hlt">level</span> (Leq) in Abuja municipality and promote a simple method for regular assessment of Leq within our environment. Method: This is a cross-sectional community based study of the environmental Leq of Abuja municipality conducted between January 2014 and January 2016. The city was divided into 12 segments including residential, business and market areas via the Abuja Geographic Information System. The major markets were captured separately on a different scale. Measurements were taken with the mobile phone softwares having validated this with Extech 407730 digital sound <span class="hlt">level</span> meter, serial no Z310135. Leq(A) were measured at different points and hours of the day and night. The average Leq(A) were classified according to localities and compared with WHO standard safety <span class="hlt">levels</span>. Results: LeqD ranged 71-92dB(A); 42-79dB(A) and 69-90dB(A) in business/ parks, residential and market places respectively. The Night measurements were similar 18dB(A)-56dB(A) and the day-night Leq(A)=77.2dB(A) and 90.4dB(A) for residential and business zones. Conclusion: The night <span class="hlt">noise</span> <span class="hlt">levels</span> are satisfactory but the day and day-night <span class="hlt">levels</span> are above the recommended tolerable values by WHO and therefore urgently call for awareness and legislative regulations. PMID:28337089</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Polio&pg=3&id=EJ583322','ERIC'); return false;" href="http://eric.ed.gov/?q=Polio&pg=3&id=EJ583322"><span>A Polio Immunization Pamphlet with Increased Appeal and Simplified Language Does Not Improve Comprehension to an <span class="hlt">Acceptable</span> <span class="hlt">Level</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Davis, Terry C.; Fredrickson, Doren D.; Arnold, Connie; Murphy, Peggy W.; Herbst, Melissa; Bocchini, Joseph A.</p> <p>1998-01-01</p> <p>Two polio-vaccine pamphlets written on a sixth-grade <span class="hlt">level</span> were compared for readability, comprehension, and preference among a broad range of parents. The easy-to-read version was widely preferred, and comprehension was significantly higher. However, the use of instructional graphics was required to achieve an <span class="hlt">acceptable</span> <span class="hlt">level</span> of comprehension.…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title41-vol3/pdf/CFR-2010-title41-vol3-sec102-80-125.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title41-vol3/pdf/CFR-2010-title41-vol3-sec102-80-125.pdf"><span>41 CFR 102-80.125 - Who has the responsibility for determining the <span class="hlt">acceptability</span> of each equivalent <span class="hlt">level</span> of safety...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... responsibility for determining the <span class="hlt">acceptability</span> of each equivalent <span class="hlt">level</span> of safety analysis? 102-80.125 Section... (Continued) FEDERAL MANAGEMENT REGULATION REAL PROPERTY 80-SAFETY AND ENVIRONMENTAL MANAGEMENT Accident and Fire Prevention Equivalent <span class="hlt">Level</span> of Safety Analysis § 102-80.125 Who has the responsibility...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec90-510.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec90-510.pdf"><span>40 CFR 90.510 - Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... <span class="hlt">level</span> and passing and failing criteria for selective enforcement audits. 90.510 Section 90.510....510 Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective... test sample until a pass decision is reached for all pollutants or a fail decision is reached for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec89-510.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec89-510.pdf"><span>40 CFR 89.510 - Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... <span class="hlt">level</span> and passing and failing criteria for selective enforcement audits. 89.510 Section 89.510... Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective enforcement audits... test sample until a pass decision is reached for all pollutants or a fail decision is reached for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec91-608.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol20/pdf/CFR-2010-title40-vol20-sec91-608.pdf"><span>40 CFR 91.608 - Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... <span class="hlt">level</span> and passing and failing criteria for selective enforcement audits. 91.608 Section 91.608... with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for selective enforcement audits. (a... manufacturer must test engines comprising the test sample until a pass decision is reached for HC+NOX or a...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5034279','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5034279"><span>Origin of multi-<span class="hlt">level</span> switching and telegraphic <span class="hlt">noise</span> in organic nanocomposite memory devices</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Song, Younggul; Jeong, Hyunhak; Chung, Seungjun; Ahn, Geun Ho; Kim, Tae-Young; Jang, Jingon; Yoo, Daekyoung; Jeong, Heejun; Javey, Ali; Lee, Takhee</p> <p>2016-01-01</p> <p>The origin of negative differential resistance (NDR) and its derivative intermediate resistive states (IRSs) of nanocomposite memory systems have not been clearly analyzed for the past decade. To address this issue, we investigate the current fluctuations of organic nanocomposite memory devices with NDR and the IRSs under various temperature conditions. The 1/f <span class="hlt">noise</span> scaling behaviors at various temperature conditions in the IRSs and telegraphic <span class="hlt">noise</span> in NDR indicate the localized current pathways in the organic nanocomposite layers for each IRS. The clearly observed telegraphic <span class="hlt">noise</span> with a long characteristic time in NDR at low temperature indicates that the localized current pathways for the IRSs are attributed to trapping/de-trapping at the deep trap <span class="hlt">levels</span> in NDR. This study will be useful for the development and tuning of multi-bit storable organic nanocomposite memory device systems. PMID:27659298</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22978870','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22978870"><span>Listening <span class="hlt">level</span> of music through headphones in train car <span class="hlt">noise</span> environments.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shimokura, Ryota; Soeta, Yoshiharu</p> <p>2012-09-01</p> <p>Although portable music devices are useful for passing time on trains, exposure to music using headphones for long periods carries the risk of damaging hearing acuity. The aim of this study is to examine the listening <span class="hlt">level</span> of music through headphones in the noisy environment of a train car. Eight subjects adjusted the volume to an optimum <span class="hlt">level</span> (L(music)) in a simulated noisy train car environment. In Experiment I, the effects of <span class="hlt">noise</span> <span class="hlt">level</span> (L(train)) and type of train <span class="hlt">noise</span> (rolling, squealing, impact, and resonance) were examined. Spectral and temporal characteristics were found to be different according to the train <span class="hlt">noise</span> type. In Experiment II, the effects of L(train) and type of music (five vocal and five instrumental music) were examined. Each music type had a different pitch strength and spectral centroid, and each was evaluated by φ(1) and W(φ(0)), respectively. These were classified as factors of the autocorrelation function (ACF) of the music. Results showed that L(music) increased as L(train) increased in both experiments, while the type of music greatly influenced L(music). The type of train <span class="hlt">noise</span>, however, only slightly influenced L(music). L(music) can be estimated using L(train) and the ACF factors φ(1) and W(φ(0)).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23972900','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23972900"><span>Measuring the <span class="hlt">levels</span> of <span class="hlt">noise</span> at the İstanbul Atatürk Airport and comparisons with model simulations.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sari, Deniz; Ozkurt, Nesimi; Akdag, Ali; Kutukoglu, Murat; Gurarslan, Aliye</p> <p>2014-06-01</p> <p>Airport <span class="hlt">noise</span> and its impact on the surrounding areas are major issues in the aviation industry. The İstanbul Atatürk Airport is a major global airport with passenger numbers increasing rapidly per annum. The <span class="hlt">noise</span> <span class="hlt">levels</span> for day, evening and night times were modeled around the İstanbul Atatürk Airport according to the European <span class="hlt">Noise</span> Directive using the actual data records for the year 2011. The "ECAC Doc. 29-Interim" method was used for the computation of the aircraft traffic <span class="hlt">noise</span>. In the setting the <span class="hlt">noise</span> model for the local airport topography was taken into consideration together with the <span class="hlt">noise</span> source data, the airport loadings, features of aircraft and actual air traffic data. Model results were compared with long-term <span class="hlt">noise</span> measurement values for calibration. According to calibration results, classifications of the aircraft type and flight tracks were revised. For <span class="hlt">noise</span> model validation, the daily <span class="hlt">noise</span> measurements at four additional locations were used during the verification period. The input data was re-edited only for these periods and the model was validated. A successful model performance was obtained in several zones around the airport. The validated <span class="hlt">noise</span> model of the İstanbul Atatürk Airport can be now utilized both for determining the <span class="hlt">noise</span> <span class="hlt">levels</span> in the future and for producing new strategies which are about the land use planning, operational considerations for the air traffic management and the <span class="hlt">noise</span> abatement procedures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26426033','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26426033"><span>A Comparative Land Use-Based Analysis of <span class="hlt">Noise</span> Pollution <span class="hlt">Levels</span> in Selected Urban Centers of Nigeria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Baloye, David O; Palamuleni, Lobina G</p> <p>2015-09-29</p> <p>Growth in the commercialization, mobility and urbanization of human settlements across the globe has greatly exposed world urban population to potentially harmful <span class="hlt">noise</span> <span class="hlt">levels</span>. The situation is more disturbing in developing countries like Nigeria, where there are no sacrosanct <span class="hlt">noise</span> laws and regulations. This study characterized <span class="hlt">noise</span> pollution <span class="hlt">levels</span> in Ibadan and Ile-Ife, two urban areas of Southwestern Nigeria that have experienced significant increases in population and land use activities. Eight hundred <span class="hlt">noise</span> measurements, taken at 20 different positions in the morning, afternoon, and evening of carefully selected weekdays, in each urban area, were used for this study. Findings put the average <span class="hlt">noise</span> <span class="hlt">levels</span> in the urban centers at between 53 dB(A) and 89 dB (A), a far cry from the World Health Organization (WHO) permissible limits in all the land use types, with highest <span class="hlt">noise</span> pollution <span class="hlt">levels</span> recorded for transportation, commercial, residential and educational land use types. The result of the one-way ANOVA test carried out on the dependent variable <span class="hlt">noise</span> and fixed factor land use types reveals a statistically significant mean <span class="hlt">noise</span> <span class="hlt">levels</span> across the study area (F(3,34) = 15.13, p = 0.000). The study underscores <span class="hlt">noise</span> pollution monitoring and the urgent need to control urban <span class="hlt">noise</span> pollution with appropriate and effective policies.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4626965','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4626965"><span>A Comparative Land Use-Based Analysis of <span class="hlt">Noise</span> Pollution <span class="hlt">Levels</span> in Selected Urban Centers of Nigeria</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Baloye, David O.; Palamuleni, Lobina G.</p> <p>2015-01-01</p> <p>Growth in the commercialization, mobility and urbanization of human settlements across the globe has greatly exposed world urban population to potentially harmful <span class="hlt">noise</span> <span class="hlt">levels</span>. The situation is more disturbing in developing countries like Nigeria, where there are no sacrosanct <span class="hlt">noise</span> laws and regulations. This study characterized <span class="hlt">noise</span> pollution <span class="hlt">levels</span> in Ibadan and Ile-Ife, two urban areas of Southwestern Nigeria that have experienced significant increases in population and land use activities. Eight hundred <span class="hlt">noise</span> measurements, taken at 20 different positions in the morning, afternoon, and evening of carefully selected weekdays, in each urban area, were used for this study. Findings put the average <span class="hlt">noise</span> <span class="hlt">levels</span> in the urban centers at between 53 dB(A) and 89 dB (A), a far cry from the World Health Organization (WHO) permissible limits in all the land use types, with highest <span class="hlt">noise</span> pollution <span class="hlt">levels</span> recorded for transportation, commercial, residential and educational land use types. The result of the one-way ANOVA test carried out on the dependent variable <span class="hlt">noise</span> and fixed factor land use types reveals a statistically significant mean <span class="hlt">noise</span> <span class="hlt">levels</span> across the study area (F(3,34) = 15.13, p = 0.000). The study underscores <span class="hlt">noise</span> pollution monitoring and the urgent need to control urban <span class="hlt">noise</span> pollution with appropriate and effective policies. PMID:26426033</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20017679','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20017679"><span>What is the influence of background <span class="hlt">noise</span> and exercise on the listening <span class="hlt">levels</span> of iPod users?</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hodgetts, William; Szarko, Ryan; Rieger, Jana</p> <p>2009-12-01</p> <p>The widespread use of portable listening devices (PLDs) has increased concern about the potential for hearing impairment caused by their use. The current study investigated the effects of external <span class="hlt">noise</span> and exercise on the use of PLDs. The 24 participants listened to the same song on an iPod during rest-in-quiet, rest-in-<span class="hlt">noise</span>, and exercise-in-<span class="hlt">noise</span> conditions. Preferred listening <span class="hlt">levels</span> (PLLs) were recorded and participants' maximum <span class="hlt">noise</span> doses were calculated. Participants selected significantly higher listening <span class="hlt">levels</span> in both <span class="hlt">noise</span> conditions than in the quiet condition. The variability of volume selection was reduced significantly in the <span class="hlt">noise</span> conditions. The maximum daily <span class="hlt">noise</span> dose would have been exceeded by seven participants in the rest-in-<span class="hlt">noise</span> condition and by eight in the exercise-in-<span class="hlt">noise</span> condition compared to one participant in the rest-in-quiet condition. These results indicated that increased background <span class="hlt">noise</span> causes individuals to increase the volume on their PLDs to potentially dangerous <span class="hlt">levels</span> and that increased <span class="hlt">noise</span> alone was not the only factor affecting the participants as the addition of exercise induced even further increases in PLLs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118.1918R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118.1918R"><span>Meeting 2006, outdoor <span class="hlt">noise</span> directive (OND) <span class="hlt">noise</span> <span class="hlt">levels</span> for a diesel engine driven air compressor: A case study in <span class="hlt">noise</span> reduction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rowe, David F.</p> <p>2005-09-01</p> <p>In January 2006, the <span class="hlt">noise</span> limits for many products in the European Union will drop by 2-3 dBA, as directed by 2000/14/EC ``<span class="hlt">Noise</span> Emission in the Environment by Equipment Used Outdoors,'' commonly called the ``Outdoor <span class="hlt">Noise</span> Directive,'' or ``OND.'' Air compressors are among the products addressed by this directive. At Ingersoll-Rand, significant effort has been directed at meeting the challenge of reducing <span class="hlt">noise</span> on a variety of diesel engine driven air compressor platforms, ranging from 15 to 350 kW diesel engine power ratings. This paper presents a case study of the <span class="hlt">noise</span> reduction on a 750 cfm (21 m3/min) air compressor operating at 300 psig (21 bar), to meet the 2006 OND <span class="hlt">noise</span> limit of 100 LwA.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26723364','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26723364"><span>Empirical prediction of peak pressure <span class="hlt">levels</span> in anthropogenic impulsive <span class="hlt">noise</span>. Part I: Airgun arrays signals.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Galindo-Romero, Marta; Lippert, Tristan; Gavrilov, Alexander</p> <p>2015-12-01</p> <p>This paper presents an empirical linear equation to predict peak pressure <span class="hlt">level</span> of anthropogenic impulsive signals based on its correlation with the sound exposure <span class="hlt">level</span>. The regression coefficients are shown to be weakly dependent on the environmental characteristics but governed by the source type and parameters. The equation can be applied to values of the sound exposure <span class="hlt">level</span> predicted with a numerical model, which provides a significant improvement in the prediction of the peak pressure <span class="hlt">level</span>. Part I presents the analysis for airgun arrays signals, and Part II considers the application of the empirical equation to offshore impact piling <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27155094','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27155094"><span>Do outdoor environmental <span class="hlt">noise</span> and atmospheric NO2 <span class="hlt">levels</span> spatially overlap in urban areas?</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tenailleau, Quentin M; Bernard, Nadine; Pujol, Sophie; Parmentier, Anne-Laure; Boilleaut, Mathieu; Houot, Hélène; Joly, Daniel; Mauny, Frédéric</p> <p>2016-07-01</p> <p>The urban environment holds numerous emission sources for air and <span class="hlt">noise</span> pollution, creating optimum conditions for environmental multi-exposure situations. Evaluation of the joint-exposure <span class="hlt">levels</span> is the main obstacle for multi-exposure studies and one of the biggest challenges of the next decade. The present study aims to describe the <span class="hlt">noise</span>/NO2 multi-exposure situations in the urban environment by exploring the possible discordant and concordant situations of both exposures. Fine-scale diffusion models were developed in the European medium-sized city of Besançon (France), and a classification method was used to evaluate the multi-exposure situations in the façade perimeter of 10,825 buildings. Although correlated (Pearson's r = 0.64, p < 0.01), urban spatial distributions of the <span class="hlt">noise</span> and NO2 around buildings do not overlap, and 30% of the buildings were considered to be discordant in terms of the <span class="hlt">noise</span> and NO2 exposure <span class="hlt">levels</span>. This discrepancy is spatially structured and associated with variables describing the building's environment. Our results support the presence of several co-existing, multi-exposure situations across the city impacted by both the urban morphology and the emission and diffusion/propagation phases of each pollutant. Identifying the mechanisms of discrepancy and convergence of multi-exposure situations could help improve the health risk assessment and public health.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002ASAJ..112.2376J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002ASAJ..112.2376J"><span>Analysis of the <span class="hlt">levels</span> of ambient <span class="hlt">noise</span> present in the Colonia Auditorium (October 2001)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jalisco, Zapopan; Palafox, Lourdes; Orozco, Martha; Rodriguez, Erika</p> <p>2002-11-01</p> <p>The study area is located in the city of Guadalajara, defined by: delimited in the north by the Gonzlez Gallo street; in the south by the Anillo Perifrico street; in the east by Avenida Mezquitan; and in the west by Avenida Alcalde. There were 38 measurement points outside the auditorium and 25 inside. A poll was conducted among the neighbors and visitors in both areas, getting 70 replies. <span class="hlt">Noise</span> <span class="hlt">levels</span> were between 41-101 dB(A) on the outside, average Leq on the outside was 64.5 dB(A), and inside was 80.15 dB(A). The conclusion is that the whole area is affected by traffic <span class="hlt">noise</span>, as well by the huge number of visitors, the electric games, and the electric generators that supply energy to them. On the outside 21 points were above 65 dB(A), which means that 55% were above the average; on the inside, 100% were above 65 dB(A). Thus the neighbors are exposed to high <span class="hlt">noise</span> <span class="hlt">levels</span> due to the festivities during October. The biggest problem, however, is the <span class="hlt">noise</span> exposure of the workers inside the auditorium, due to music, games, people, and electric generators.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23029917','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23029917"><span>Assessment and analysis of <span class="hlt">noise</span> <span class="hlt">levels</span> in and around Ib river coalfield, Orissa, India.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mohapatra, Haraprasad; Goswami, Shreerup</p> <p>2012-05-01</p> <p>Heavy earth moving machineries, different capacities of dumpers and loaders, blasting and drilling make the mining environment noisy. A study was carried out to assess the <span class="hlt">noise</span> <span class="hlt">level</span> in different opencast projects in and around Belpahar and Brajarajnagar areas of Ib river coalfield. <span class="hlt">Noise</span> assessment was carried out in various residential, commercial and industrial places. The <span class="hlt">noise</span> <span class="hlt">levels</span>, especially L(eq) values of different wheel loaders, dumpers, shovel and crusher units were also assessed and were more than permissible limit (90dB) in some of their operating conditions. Sound ressure <span class="hlt">level</span> measurements while drilling into coal and overburden at Lakhanpur opencast project yielded <span class="hlt">noise</span> <span class="hlt">levels</span> (L(eq)) of 81.33 to 96.2 dB. Thus, these L(eq) values of drilling machines in most of the operating conditions were above permissible limit. The average <span class="hlt">noise</span> intensities (6 a.m.-10 p.m.: 51.6-60.875dB and 10 p.m.-6 a.m.: 42.6-49.8dB) and L(eq) values (6 a.m.-10 p.m.: 50.9-67.0dB and 10 p.m.-6 a.m.: 40.8-53.3dB) during both day and night time of the residential areas around the Ib river coalfield were in close proximity or beyond the permissible limit. The L(eq) values at some of the commercial and industrial places were beyond (6 a.m.-10 p.m.: 61.6-88.3 dB and 10 p.m.-6 a.m.: 55.4-64.8dB) permissible limit. However, in most of the cases, the L(max) <span class="hlt">noise</span> values were more (6 a.m.-10 p.m.: 68.5-91.4 dB and 10 p.m.-6 a.m.: 69.3-76.4dB) than the permissible limit. Analysis of variance was also computed for heavy earth moving machineries in different operating conditions and also for different residential, commercial and industrial places to infer the <span class="hlt">level</span> of significance. The difference of <span class="hlt">noise</span> intensity produced by different wheel loaders at Lakhanpur and Lilari opencast projects, drilling machines at Lakhanpur opencast project, 50 tons capacity dumpers at various conditions of Ib river coalfield within the same operating condition was significant at both 5% and 1% <span class="hlt">levels</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118..914D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118..914D"><span>Word recognition in <span class="hlt">noise</span> at higher-than-normal <span class="hlt">levels</span>: Decreases in scores and increases in masking</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dubno, Judy R.; Horwitz, Amy R.; Ahlstrom, Jayne B.</p> <p>2005-08-01</p> <p>Under certain conditions, speech recognition in <span class="hlt">noise</span> decreases above conversational <span class="hlt">levels</span> when signal-to-<span class="hlt">noise</span> ratio is held constant. The current study was undertaken to determine if nonlinear growth of masking and the subsequent reduction in ``effective'' signal-to-<span class="hlt">noise</span> ratio accounts for this decline. Nine young adults with normal hearing listened to monosyllabic words at three <span class="hlt">levels</span> in each of three <span class="hlt">levels</span> of a masker shaped to match the speech spectrum. An additional low-<span class="hlt">level</span> <span class="hlt">noise</span> equated audibility by producing equivalent masked thresholds for all subjects. If word recognition was determined entirely by signal-to-<span class="hlt">noise</span> ratio and was independent of overall speech and masker <span class="hlt">levels</span>, scores at a given signal-to-<span class="hlt">noise</span> ratio should remain constant with increasing <span class="hlt">level</span>. Masked pure-tone thresholds measured in the speech-shaped maskers increased linearly with increasing masker <span class="hlt">level</span> at lower frequencies but nonlinearly at higher frequencies, consistent with nonlinear growth of upward spread of masking that followed the peaks in the spectrum of the speech-shaped masker. Word recognition declined significantly with increasing <span class="hlt">level</span> when signal-to-<span class="hlt">noise</span> ratio was held constant which was attributed to nonlinear growth of masking and reduced ``effective'' signal-to-<span class="hlt">noise</span> ratio at high speech-shaped masker <span class="hlt">levels</span>, as indicated by audibility estimates based on the Articulation Index.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MSSP...76..677S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MSSP...76..677S"><span>Design method of automotive powertrain mounting system based on vibration and <span class="hlt">noise</span> limitations of vehicle <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shangguan, Wen-Bin; Liu, Xiao-Ang; Lv, Zhao-Ping; Rakheja, Subhash</p> <p>2016-08-01</p> <p>The design logic and calculation method for determining mount stiffness and damping for a Powertrain Mounting System (PMS) based on reductions of vehicle vibration and <span class="hlt">noise</span> contributed by mounts is proposed in this paper. Firstly, the design target for a PMS with regard to vibration and <span class="hlt">noise</span> limitations of vehicle <span class="hlt">level</span> contributed form mounts is described. Then a vehicle model with 13 Degree of Freedoms (DOFs) is proposed, which includes 6DOFs for the powertrain, 3 DOFs for the car body and 4DOFs for the four unsprung mass, and the dynamic equation for the model is derived. Some widely used models, such as the 6 DOFs model of the powertrain for the design calculation of a PMS, the 7 DOFs model (Body's 3 DOFs; unsprung mass's 4 DOFs) and the 9 DOFs model (powertrain's 6 DOFs; Body's 3 DOFs) for ride analysis of a vehicle, are the specific cases of the presented model of 13 DOF. Thirdly, the calculation method for obtaining the vibration of seat track and evaluation point and the <span class="hlt">noise</span> at driver right ear is presented based on the mount forces and the vibration and <span class="hlt">noise</span> transfer functions. An optimization process is proposed to get the mount stiffness and damping based on minimization of vehicle vibration and <span class="hlt">noise</span>, and the optimized stiffness is validated by comparing the calculated vibration and <span class="hlt">noise</span> and limitations. In the end of this paper, the natural frequencies and mode energies for the powertrain, the body and the unsprung mass are calculated using different models and the results are compared and analyzed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19930010699','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19930010699"><span>Propfan <span class="hlt">noise</span> propagation</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>George, Albert R.; Sim, Ben WEL-C.</p> <p>1993-01-01</p> <p>The unconventional supersonic tip speed of advanced propellers has led to uncertainties about Propfan's <span class="hlt">noise</span> <span class="hlt">acceptability</span> and compliance with Federal Aviation <span class="hlt">Noise</span> Regulation (FAR 36). Overhead flight testing of the Propfan with an SR-7L blade during 1989's Propfan Test Assessment (PTA) Program have shown unexpectedly high far-field sound pressure <span class="hlt">levels</span>. This study here attempts to provide insights into the acoustics of a single-rotating propeller (SRP) with supersonic tip speed. At the same time, the role of the atmosphere in shaping the far-field <span class="hlt">noise</span> characteristics is investigated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFM.S33D2812H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFM.S33D2812H"><span>Estimation of background <span class="hlt">noise</span> <span class="hlt">level</span> on seismic station using statistical analysis for improved analysis accuracy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Han, S. M.; Hahm, I.</p> <p>2015-12-01</p> <p>We evaluated the background <span class="hlt">noise</span> <span class="hlt">level</span> of seismic stations in order to collect the observation data of high quality and produce accurate seismic information. Determining of the background <span class="hlt">noise</span> <span class="hlt">level</span> was used PSD (Power Spectral Density) method by McNamara and Buland (2004) in this study. This method that used long-term data is influenced by not only innate electronic <span class="hlt">noise</span> of sensor and a pulse wave resulting from stabilizing but also missing data and controlled by the specified frequency which is affected by the irregular signals without site characteristics. It is hard and inefficient to implement process that filters out the abnormal signal within the automated system. To solve these problems, we devised a method for extracting the data which normally distributed with 90 to 99% confidence intervals at each period. The availability of the method was verified using 62-seismic stations with broadband and short-period sensors operated by the KMA (Korea Meteorological Administration). Evaluation standards were NHNM (New High <span class="hlt">Noise</span> Model) and NLNM (New Low <span class="hlt">Noise</span> Model) published by the USGS (United States Geological Survey). It was designed based on the western United States. However, Korean Peninsula surrounded by the ocean on three sides has a complicated geological structure and a high population density. So, we re-designed an appropriate model in Korean peninsula by statistically combined result. The important feature is that secondary-microseism peak appeared at a higher frequency band. Acknowledgements: This research was carried out as a part of "Research for the Meteorological and Earthquake Observation Technology and Its Application" supported by the 2015 National Institute of Meteorological Research (NIMR) in the Korea Meteorological Administration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AcAau.128..304B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AcAau.128..304B"><span>A simple indicator for estimating the <span class="hlt">noise</span> <span class="hlt">level</span> of a hyperspectral data cube for earth observation missions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ben-Dor, Eyal; Notesco, Gila</p> <p>2016-11-01</p> <p>A method for estimating the <span class="hlt">level</span> of <span class="hlt">noise</span> of a hyperspectral data cube is proposed. The method includes <span class="hlt">noise</span> reduction using the Minimum <span class="hlt">Noise</span> Fraction (MNF) transform and mapping the spectral dissimilarity between the pixels in the resulting <span class="hlt">noise</span>-reduced radiance image, as well as in the original noisy radiance image, using the Spectral Angle Mapper (SAM) algorithm. Comparing the two maps, on a pixel by pixel basis, gives a value indicating the addition of <span class="hlt">noise</span> to the spectrum of each pixel. An average value for the entire image is calculated, defined as the Image <span class="hlt">Noise</span> Indicator (INI). In practice, this value indicates the quality of the data. Combining the INI value with the <span class="hlt">level</span> of radiance enables estimating the Image <span class="hlt">Noise</span> <span class="hlt">Level</span> (INL). The method was applied and examined on a noisy synthetic image and then implemented for over 20 acquired images from different hyperspectral sensors and their <span class="hlt">noise</span> <span class="hlt">level</span> was estimated. Further examination showed that the INI value is independent of the heterogeneity of the hyperspectral data cube. The INI value, indicating the <span class="hlt">noise</span> <span class="hlt">level</span>, might increase as a geo-reference procedure is applied to hyperspectral data cube. The INI-INL can also be used as a quality indicator (QI) in the ongoing effort to objectively certify hyperspectral remote sensing images for practical usages.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19800051329&hterms=wind+turbine+impact&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dwind%2Bturbine%2Bimpact','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19800051329&hterms=wind+turbine+impact&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dwind%2Bturbine%2Bimpact"><span>An exploratory survey of <span class="hlt">noise</span> <span class="hlt">levels</span> associated with a 100 kW wind turbine</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Balombin, J. R.</p> <p>1980-01-01</p> <p>During performance tests of a 125-foot diameter, 100 kW wind turbine at the NASA Plum Brook Station near Sandusky, Ohio, the opportunity arose to make exploratory <span class="hlt">noise</span> measurements and results of those surveys are presented. The data include measurements as functions of distance from the turbine, and directivity angle, and cover a frequency range from 1 Hz to several kHz. Potential community impact is discussed in terms of A-weighted <span class="hlt">noise</span> <span class="hlt">levels</span> relative to background <span class="hlt">levels</span>, and the infrasonic spectral content. Finally, the change in the sound power spectrum associated with a change in the rotor speed is described. The acoustic impact of this size wind turbine is judged to be minimal.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4574699','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4574699"><span>Evaluation of Distortion Product Otoacoustic Emissions (DPOAEs) among workers at an Industrial Company exposed to different industrial <span class="hlt">noise</span> <span class="hlt">levels</span> in 2014</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zare, Sajad; Nassiri, Parvin; Monazzam, Mohammad Reza; Pourbakht, Akram; Azam, Kamal; Golmohammadi, Taghi</p> <p>2015-01-01</p> <p>Background: <span class="hlt">Noise</span>-induced hearing loss (NIHL) is usually one of the main problems in industrial settings. The aim of this study was to determine whether changes in the signal-to-<span class="hlt">noise</span> ratio (SNR) in different DPOAE are caused by exposure to different <span class="hlt">levels</span> of <span class="hlt">noise</span> at different time intervals among workers exposed to <span class="hlt">noise</span>. Methods: This case-control study was conducted in the autumn of 2014 on 45 workers at Gol Gohar Mining and Industrial Company, which is located in Sirjan in southeast Iran. The workers were divided into three groups based on their <span class="hlt">noise</span> exposure, i.e., 1) 15 office workers as a control group with exposure to low <span class="hlt">levels</span> of <span class="hlt">noise</span>, 2) 15 workers from manufacturing departments who were exposed to a medium <span class="hlt">level</span> of <span class="hlt">noise</span>, and 3) 15 workers from manufacturing departments who were exposed to high <span class="hlt">levels</span> of <span class="hlt">noise</span>. The SNRs at the frequencies of 1000, 2000, 3000, 4000, and 6000 Hz were measured in both ears at three different time intervals during the shift work. SNRs of 6 or greater were considered as inclusion criterion. Repeated measures, the Spearman rank-order correlation test, and paired t-test analyses were used with α = 0.05 being the <span class="hlt">level</span> of significance. Results: For all frequencies in the right and left ears, the SNR values were more than 6, thus all SNR values were considered as <span class="hlt">acceptable</span> responses. The effects of time and sound pressure <span class="hlt">level</span> (SPL) on SNR were significant for the right and left ears (p = 0.027 and < 0.001, respectively). There was a statistically significant correlation between the SNR values in the right and left ears for the time intervals 7:30–8:00 A.M. and 13:30–14:00 P.M., which implied that an increase in the duration of exposure led to reduced SNR values (p = 0.024, r = 0.948). Conclusions: The comparison of the SNR values in the right and left ears (for all frequencies and the three different SPLs) indicated that the values decreased during the shift work. PMID:26388979</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EGUGA..1713837V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EGUGA..1713837V"><span>Background <span class="hlt">noise</span> <span class="hlt">levels</span> and correlation with ship traffic in the Gulf of Catania</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Viola, Salvatore; Buscaino, Giuseppa; Caruso, Francesco; Chierici, Francesco; Embriaco, Davide; Favali, Paolo; Giovanetti, Gabriele; Grammauta, Roasario; Larosa, Giuseppina; Pavan, Gianni; Pellegrino, Carmelo; Pulvirenti, Sara; Riccobene, Giorgio; Sciacca, Virginia; Simeone, Francesco; Beranzoli, Laura; Marinaro, Giuditta</p> <p>2015-04-01</p> <p>In the last decades the growing interest in the evaluation of the underwater acoustic <span class="hlt">noise</span> for studies in the fields of geology, biology and high-energy physics is driving the scientific community to collaborate towards a multidisciplinary approach to the topic. In June 2012 in the framework of the European project EMSO, a multidisciplinary underwater observatory, named NEMO-SN1, was installed 25 km off-shore the port of Catania, at a depth of 2100 m and operated until May 2013 by INFN (Istituto Nazionale di Fisica Nucleare) and INGV (Istituto Nazionale di Geofisica e Vulcanologia). NEMO-SN1 hosted aboard geophysical, oceanographic and acoustic sensors: among these a seismic hydrophone model SMID DT-405D(V). In this work, conducted within the activity of the SMO project, the results on the evaluation of the underwater acoustic pollution in the Gulf of Catania through SMID DT-405D(V) recordings are presented. The seismic hydrophone provided a data set of about 11 months of continuous (24/7) recordings. Underwater sounds have been continuously digitized at a sampling frequency of 2 kHz and the acquired data have been stored in 10min long files for off-line analysis. To describe one-year background <span class="hlt">noise</span> <span class="hlt">levels</span>, the mean integrated acoustic <span class="hlt">noise</span> was measured every second (sampling frequency 2000, NFFT 2048) in the 1/3 octave bands with centre frequency 63 Hz and for each 10 minutes-long file the 5th, the 50th and the 98th percentiles were calculated. Measured <span class="hlt">noise</span> was correlated with the shipping traffic in the area, thanks to the data provided by an AIS receiver installed at the INFN-Laboratori Nazionali del Sud. An acoustic <span class="hlt">noise</span> increment was measured in coincidence with the passing of crafts in the area and it was possible to identify the characteristic spectrum of each ship. A simple model for the estimation of the acoustic <span class="hlt">noise</span> induced by the ships passing through the area was developed. The model was applied by using AIS data acquired during the operation</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5234804','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5234804"><span>Classification of Partial Discharge Measured under Different <span class="hlt">Levels</span> of <span class="hlt">Noise</span> Contamination</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2017-01-01</p> <p>Cable joint insulation breakdown may cause a huge loss to power companies. Therefore, it is vital to diagnose the insulation quality to detect early signs of insulation failure. It is well known that there is a correlation between Partial discharge (PD) and the insulation quality. Although many works have been done on PD pattern recognition, it is usually performed in a <span class="hlt">noise</span> free environment. Also, works on PD pattern recognition in actual cable joint are less likely to be found in literature. Therefore, in this work, classifications of actual cable joint defect types from partial discharge data contaminated by <span class="hlt">noise</span> were performed. Five cross-linked polyethylene (XLPE) cable joints with artificially created defects were prepared based on the defects commonly encountered on site. Three different types of input feature were extracted from the PD pattern under artificially created noisy environment. These include statistical features, fractal features and principal component analysis (PCA) features. These input features were used to train the classifiers to classify each PD defect types. Classifications were performed using three different artificial intelligence classifiers, which include Artificial Neural Networks (ANN), Adaptive Neuro-Fuzzy Inference System (ANFIS) and Support Vector Machine (SVM). It was found that the classification accuracy decreases with higher <span class="hlt">noise</span> <span class="hlt">level</span> but PCA features used in SVM and ANN showed the strongest tolerance against <span class="hlt">noise</span> contamination. PMID:28085953</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27493778','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27493778"><span>Anthropogenic <span class="hlt">noise</span>, but not artificial light <span class="hlt">levels</span> predicts song behaviour in an equatorial bird.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Dorado-Correa, Adriana M; Rodríguez-Rocha, Manuel; Brumm, Henrik</p> <p>2016-07-01</p> <p>Birds in cities start singing earlier in the morning than in rural areas; commonly this shift is attributed to light pollution. Some studies have suggested that traffic <span class="hlt">noise</span> has a stronger influence on singing activity than artificial light does. Changes in the timing of singing behaviour in relation to <span class="hlt">noise</span> and light pollution have only been investigated in the temperate zones. Tropical birds, however, experience little seasonal variation in day length and may be less dependent on light intensity as a modifier for reproductive behaviours such as song. To test whether <span class="hlt">noise</span> or light pollution has a stronger impact on the dawn chorus of a tropical bird, we investigated the singing behaviour of rufous-collared sparrows (Zonotrichia capensis) in Bogota, Colombia at two times during the year. We found that birds in places with high <span class="hlt">noise</span> <span class="hlt">levels</span> started to sing earlier. Light pollution did not have a significant effect. Birds may begin to sing earlier in noisy areas to avoid acoustic masking by traffic later in the morning. Our results also suggest that some tropical birds may be less sensitive to variations in day length and thus less sensitive to light pollution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4968470','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4968470"><span>Anthropogenic <span class="hlt">noise</span>, but not artificial light <span class="hlt">levels</span> predicts song behaviour in an equatorial bird</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Rodríguez-Rocha, Manuel; Brumm, Henrik</p> <p>2016-01-01</p> <p>Birds in cities start singing earlier in the morning than in rural areas; commonly this shift is attributed to light pollution. Some studies have suggested that traffic <span class="hlt">noise</span> has a stronger influence on singing activity than artificial light does. Changes in the timing of singing behaviour in relation to <span class="hlt">noise</span> and light pollution have only been investigated in the temperate zones. Tropical birds, however, experience little seasonal variation in day length and may be less dependent on light intensity as a modifier for reproductive behaviours such as song. To test whether <span class="hlt">noise</span> or light pollution has a stronger impact on the dawn chorus of a tropical bird, we investigated the singing behaviour of rufous-collared sparrows (Zonotrichia capensis) in Bogota, Colombia at two times during the year. We found that birds in places with high <span class="hlt">noise</span> <span class="hlt">levels</span> started to sing earlier. Light pollution did not have a significant effect. Birds may begin to sing earlier in noisy areas to avoid acoustic masking by traffic later in the morning. Our results also suggest that some tropical birds may be less sensitive to variations in day length and thus less sensitive to light pollution. PMID:27493778</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28085953','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28085953"><span>Classification of Partial Discharge Measured under Different <span class="hlt">Levels</span> of <span class="hlt">Noise</span> Contamination.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jee Keen Raymond, Wong; Illias, Hazlee Azil; Abu Bakar, Ab Halim</p> <p>2017-01-01</p> <p>Cable joint insulation breakdown may cause a huge loss to power companies. Therefore, it is vital to diagnose the insulation quality to detect early signs of insulation failure. It is well known that there is a correlation between Partial discharge (PD) and the insulation quality. Although many works have been done on PD pattern recognition, it is usually performed in a <span class="hlt">noise</span> free environment. Also, works on PD pattern recognition in actual cable joint are less likely to be found in literature. Therefore, in this work, classifications of actual cable joint defect types from partial discharge data contaminated by <span class="hlt">noise</span> were performed. Five cross-linked polyethylene (XLPE) cable joints with artificially created defects were prepared based on the defects commonly encountered on site. Three different types of input feature were extracted from the PD pattern under artificially created noisy environment. These include statistical features, fractal features and principal component analysis (PCA) features. These input features were used to train the classifiers to classify each PD defect types. Classifications were performed using three different artificial intelligence classifiers, which include Artificial Neural Networks (ANN), Adaptive Neuro-Fuzzy Inference System (ANFIS) and Support Vector Machine (SVM). It was found that the classification accuracy decreases with higher <span class="hlt">noise</span> <span class="hlt">level</span> but PCA features used in SVM and ANN showed the strongest tolerance against <span class="hlt">noise</span> contamination.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA110592','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA110592"><span>Use of Aqueous Foam to Reduce Shoulder-Launched Rocket <span class="hlt">Noise</span> <span class="hlt">Level</span>: Feasibility Investigation.</span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>1981-07-01</p> <p>1 tj~ * UNCLASSIFIED SECUflITY CLASSIFICATION OF THIS PAGE (**en Dese Entered) REPORT DOCUMENTATION PAGE BEFORE COOTRUTIONS I. REPORT NUMBER 2. GOVT...assistance and cooperation of Mr. Jerry Arszman of U.S. Army MIRADCOM (Missile Research and Development Command) and Mr. Charles Carter and Mr. George...REFERENCES 1. A. Clark, et al., The Reduction of <span class="hlt">Noise</span> <span class="hlt">Levels</span> from Explosive Test Facilities Using Aqueous Foan, Royal Armament Research and Development</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Evolution&pg=3&id=EJ1053327','ERIC'); return false;" href="http://eric.ed.gov/?q=Evolution&pg=3&id=EJ1053327"><span>A Review of Research Instruments Assessing <span class="hlt">Levels</span> of Student <span class="hlt">Acceptance</span> of Evolution</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yasri, Pratchayapong</p> <p>2014-01-01</p> <p>Darwin's theory of evolution by means of natural selection, called evolution for short, is perceived as a unifying theme in biology, forming a major part of all biology syllabuses. It is reported that student <span class="hlt">acceptance</span> of evolution associates with conceptual understandings of biological contents, nature of science, as well as motivations to…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ1084985.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ1084985.pdf"><span>Measuring <span class="hlt">Levels</span> of End-Users' <span class="hlt">Acceptance</span> and Use of Hybrid Library Services</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Tibenderana, Prisca; Ogao, Patrick; Ikoja-Odongo, J.; Wokadala, James</p> <p>2010-01-01</p> <p>This study concerns the adoption of Information Communication Technology (ICT) services in libraries. The study collected 445 usable data from university library end-users using a cross-sectional survey instrument. It develops, applies and tests a research model of <span class="hlt">acceptance</span> and use of such services based on an existing UTAUT model by Venkatesh,…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Messenger&pg=4&id=EJ963297','ERIC'); return false;" href="http://eric.ed.gov/?q=Messenger&pg=4&id=EJ963297"><span>Comparison of Web 2.0 Technology <span class="hlt">Acceptance</span> <span class="hlt">Level</span> Based on Cultural Differences</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yoo, Sun Joo; Huang, Wen-hao David</p> <p>2011-01-01</p> <p>In order to inform educators in higher education on the integration of Web 2.0 applications for engaging and effective learning experiences, this survey study compared the use and <span class="hlt">acceptance</span> of Web 2.0 applications between American and Korean college students through the lens of cultural differences. Undergraduate students were recruited to…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24858928','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24858928"><span>Public <span class="hlt">acceptability</span> of population-<span class="hlt">level</span> interventions to reduce alcohol consumption: a discrete choice experiment.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pechey, Rachel; Burge, Peter; Mentzakis, Emmanouil; Suhrcke, Marc; Marteau, Theresa M</p> <p>2014-07-01</p> <p>Public <span class="hlt">acceptability</span> influences policy action, but the most <span class="hlt">acceptable</span> policies are not always the most effective. This discrete choice experiment provides a novel investigation of the <span class="hlt">acceptability</span> of different interventions to reduce alcohol consumption and the effect of information on expected effectiveness, using a UK general population sample of 1202 adults. Policy options included high, medium and low intensity versions of: Minimum Unit Pricing (MUP) for alcohol; reducing numbers of alcohol retail outlets; and regulating alcohol advertising. Outcomes of interventions were predicted for: alcohol-related crimes; alcohol-related hospital admissions; and heavy drinkers. First, the models obtained were used to predict preferences if expected outcomes of interventions were not taken into account. In such models around half of participants or more were predicted to prefer the status quo over implementing outlet reductions or higher intensity MUP. Second, preferences were predicted when information on expected outcomes was considered, with most participants now choosing any given intervention over the status quo. <span class="hlt">Acceptability</span> of MUP interventions increased by the greatest extent: from 43% to 63% preferring MUP of £1 to the status quo. Respondents' own drinking behaviour also influenced preferences, with around 90% of non-drinkers being predicted to choose all interventions over the status quo, and with more moderate than heavy drinkers favouring a given policy over the status quo. Importantly, the study findings suggest public <span class="hlt">acceptability</span> of alcohol interventions is dependent on both the nature of the policy and its expected effectiveness. Policy-makers struggling to mobilise support for hitherto unpopular but promising policies should consider giving greater prominence to their expected outcomes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=20100031265&hterms=dick&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Ddick','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=20100031265&hterms=dick&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Ddick"><span>Fundamental <span class="hlt">Noise</span>-Limited Optical Phase Locking at Femtowatt Light <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Dick, John; Tu, Meirong; Birnbaum, Kevin; Strekalov, Dmitry; Yu, Nan</p> <p>2008-01-01</p> <p>We describe an optical phase lock loop (PLL) designed to recover an optical carrier at powers below one picowatt in a Deep Space optical transponder. Previous low power optical phase lock has been reported with powers down to about 1 pW. We report the demonstration and characterization of the optical phase locking at femtowatt <span class="hlt">levels</span>. We achieved a phase slip rate below one cycle-slip/second at powers down to 60 femtowatts. This phase slip rate corresponds to a frequency stability of 1 10(exp -14) at 1 s, a value better than any frequency standard available today for measuring times equal to a typical two-way delay between Earth and Mars. The PLL shows very robust stability at these power <span class="hlt">levels</span>. We developed simulation software to optimize parameters of the second order PLL loop in the presence of laser flicker frequency <span class="hlt">noise</span> and white phase (photon) <span class="hlt">noise</span>, and verified the software with a white phase <span class="hlt">noise</span> model by Viterbi. We also demonstrated precise Doppler tracking at femtowatt <span class="hlt">levels</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22559390','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22559390"><span>Sound <span class="hlt">level</span> discrimination by gray treefrogs in the presence and absence of chorus-shaped <span class="hlt">noise</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bee, Mark A; Vélez, Alejandro; Forester, James D</p> <p>2012-05-01</p> <p>An important aspect of hearing and acoustic communication is the ability to discriminate differences in sound <span class="hlt">level</span>. Little is known about <span class="hlt">level</span> discrimination in anuran amphibians (frogs and toads), for which vocal communication in noisy social environments is often critical for reproduction. This study used two-choice phonotaxis tests to investigate the ability of females of Cope's gray treefrog (Hyla chrysoscelis) to discriminate between two advertisement calls differing only in sound pressure <span class="hlt">level</span> by 2, 4, or 6 dB. Tests were conducted in the presence and absence of chorus-shaped <span class="hlt">noise</span> (73 dB) and using two different ranges of signal <span class="hlt">levels</span> (73-79 dB and 79-85 dB). Females discriminated between two signals differing by as little as 2-4 dB. In contrast to expectations based on the "near miss to Weber's law" in birds and mammals, <span class="hlt">level</span> discrimination was slightly better at the lower range of signal amplitudes, a finding consistent with earlier studies of frogs and insects. Realistic <span class="hlt">levels</span> of background <span class="hlt">noise</span> simulating a breeding chorus had no discernable effect on discrimination at the sound <span class="hlt">level</span> differences tested in this study. These results have important implications for studies of auditory masking and signaling behavior in the contexts of anuran hearing and sound communication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23582494','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23582494"><span>Radioactive waste management: review on clearance <span class="hlt">levels</span> and <span class="hlt">acceptance</span> criteria legislation, requirements and standards.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Maringer, F J; Suráň, J; Kovář, P; Chauvenet, B; Peyres, V; García-Toraño, E; Cozzella, M L; De Felice, P; Vodenik, B; Hult, M; Rosengård, U; Merimaa, M; Szücs, L; Jeffery, C; Dean, J C J; Tymiński, Z; Arnold, D; Hinca, R; Mirescu, G</p> <p>2013-11-01</p> <p>In 2011 the joint research project Metrology for Radioactive Waste Management (MetroRWM)(1) of the European Metrology Research Programme (EMRP) started with a total duration of three years. Within this project, new metrological resources for the assessment of radioactive waste, including their calibration with new reference materials traceable to national standards will be developed. This paper gives a review on national, European and international strategies as basis for science-based metrological requirements in clearance and <span class="hlt">acceptance</span> of radioactive waste.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20977638','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20977638"><span>Center-<span class="hlt">level</span> patterns of indicated willingness to and actual <span class="hlt">acceptance</span> of marginal kidneys.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Massie, A B; Stewart, D E; Dagher, N N; Montgomery, R A; Desai, N M; Segev, D L</p> <p>2010-11-01</p> <p>UNet(SM) , the UNOS data collection and electronic organ allocation system, allows centers to specify organ offer <span class="hlt">acceptance</span> criteria for patients on their kidney waiting list. We hypothesized that the system might not be fully utilized and that the criteria specified by most transplant centers would be much broader than the characteristics of organs actually transplanted by those centers. We analyzed the distribution of criteria values among waitlist patients (N = 304 385) between January 2000 and February 2009, mean criteria values among listed candidates on February 19, 2009 and differences between a center's specified criteria and the organs it <span class="hlt">accepted</span> for transplant between July 2005 and April 2009. We found wide variation in use of criteria variables, with some variables mostly or entirely unused. Most centers specified very broad criteria, with little within-center variation by patient. An offer of a kidney with parameters more extreme than the maximum actually transplanted at that center was designated a 'surplus offer' and indicated a potentially avoidable delay in distribution. We found 7373 surplus offers (7.1% of all offers), concentrated among a small number of centers. The organ <span class="hlt">acceptance</span> criteria system is currently underutilized, leading to possibly avoidable inefficiencies in organ distribution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26389949','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26389949"><span>Consumer <span class="hlt">Acceptance</span> of Population-<span class="hlt">Level</span> Intervention Strategies for Healthy Food Choices: The Role of Perceived Effectiveness and Perceived Fairness.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bos, Colin; Lans, Ivo Van Der; Van Rijnsoever, Frank; Van Trijp, Hans</p> <p>2015-09-15</p> <p>The present study investigates <span class="hlt">acceptance</span> of intervention strategies for low-calorie snack choices that vary regarding the effect they have on consumers' freedom of choice (providing information, guiding choice through (dis)incentives, and restricting choice). We examine the mediating effects of perceived effectiveness and perceived fairness, and the moderating effects of barriers to choose low-calorie snacks and perceived responsibility for food choice. Data was collected through an online survey, involving three waves that were completed over a seven week timespan. Information was collected on barriers and perceived responsibility, and evaluations of a total of 128 intervention strategies with varying <span class="hlt">levels</span> of intrusiveness that were further systematically varied in terms of source, location, approach/avoidance, type, and severity. A total of 1173 respondents completed all three waves. We found that the effect of intervention intrusiveness on <span class="hlt">acceptance</span> was mediated by the perceived personal- and societal effectiveness, and the perceived fairness of interventions. For barriers and perceived responsibility, only main effects on intervention-specific beliefs were found. Government interventions were <span class="hlt">accepted</span> less than interventions by food manufacturers. In conclusion, the present study shows that <span class="hlt">acceptance</span> of interventions depends on perceptions of personal- and societal effectiveness and fairness, thereby providing novel starting points for increasing <span class="hlt">acceptance</span> of both existing and new food choice interventions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4586565','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4586565"><span>Consumer <span class="hlt">Acceptance</span> of Population-<span class="hlt">Level</span> Intervention Strategies for Healthy Food Choices: The Role of Perceived Effectiveness and Perceived Fairness</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Bos, Colin; Van Der Lans, Ivo; Van Rijnsoever, Frank; Van Trijp, Hans</p> <p>2015-01-01</p> <p>The present study investigates <span class="hlt">acceptance</span> of intervention strategies for low-calorie snack choices that vary regarding the effect they have on consumers’ freedom of choice (providing information, guiding choice through (dis)incentives, and restricting choice). We examine the mediating effects of perceived effectiveness and perceived fairness, and the moderating effects of barriers to choose low-calorie snacks and perceived responsibility for food choice. Data was collected through an online survey, involving three waves that were completed over a seven week timespan. Information was collected on barriers and perceived responsibility, and evaluations of a total of 128 intervention strategies with varying <span class="hlt">levels</span> of intrusiveness that were further systematically varied in terms of source, location, approach/avoidance, type, and severity. A total of 1173 respondents completed all three waves. We found that the effect of intervention intrusiveness on <span class="hlt">acceptance</span> was mediated by the perceived personal- and societal effectiveness, and the perceived fairness of interventions. For barriers and perceived responsibility, only main effects on intervention-specific beliefs were found. Government interventions were <span class="hlt">accepted</span> less than interventions by food manufacturers. In conclusion, the present study shows that <span class="hlt">acceptance</span> of interventions depends on perceptions of personal- and societal effectiveness and fairness, thereby providing novel starting points for increasing <span class="hlt">acceptance</span> of both existing and new food choice interventions. PMID:26389949</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6303510','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6303510"><span>Measurement of outdoor <span class="hlt">noise</span> <span class="hlt">levels</span> adjacent to K-25 facility, ORGDP</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rodman, C.W.</p> <p>1981-08-27</p> <p>In order to obtain baseline data on environmental sound for a report on the expected environmental effects of constructing an incinerator adjacent to the ORGDP, an abbreviated measurement program was carried out. Ten measurement locations were selected for the measurements, six being representative of the ORGDP fenceline, and four representative of the surrounding area. Measurements consisted of short-term octave-band measurements and one-half hour A-weighted exceedance <span class="hlt">levels</span>. It had been previously determined that the influence of the K-25 plant on the <span class="hlt">noise</span> environment tends to stabilize the minimum sound <span class="hlt">level</span> in such a way that nighttime measurements would not be needed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015TeEng..12....1Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015TeEng..12....1Z"><span>The Development And Implementation Of A Concept To Permanent Reduction Of <span class="hlt">Noise</span> Pollution In Production Taking Into Account The Legal And Economic Framework Conditions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zaušková, Lucia; Czán, Andrej; Babík, Ondrej; Piešová, Marianna</p> <p>2015-12-01</p> <p>Article deals with the issue of reducing <span class="hlt">noise</span> impact in real conditions of industrial production. The solution includes measurements and calculations of <span class="hlt">noise</span> <span class="hlt">level</span> the person is exposed to and developing proposals for effective reduction of <span class="hlt">noise</span> <span class="hlt">levels</span> at the specific workplace. When assessing <span class="hlt">noise</span> <span class="hlt">levels</span> and design to reduce it to an <span class="hlt">acceptable</span> <span class="hlt">level</span> we will consider the legal, safety and economic conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1984maph...10..205S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1984maph...10..205S"><span>Solar terrestrial influences on the D region as shown by the <span class="hlt">level</span> of atmospheric radio <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Satori, G.; Schaning, B.</p> <p>1984-05-01</p> <p>Measurements of the integrated atmospheric radio <span class="hlt">noise</span> field strength at 27 kHz, used here, were made from 1965 to 1975 at Uppsala, Kuhlungsborn, and Prague-Panska Ves. The large scale meteorological situation was considered by comparing solar disturbed and undisturbed periods under similar weather situations. In order to show the effects of the precipitating high energy particle (HEP) flux and of the Forbush decrease on the <span class="hlt">noise</span> <span class="hlt">level</span> between pairs of stations were computed as deviations from the monthly median. Delta E (dB), day by day for all six periods was studied. The correlation coefficients for noon as well as for night values were computed. The correlation coefficients were compared with those for solar undisturbed periods.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28241674','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28241674"><span>[Association between serum magnesium ion <span class="hlt">level</span> and risk of <span class="hlt">noise</span>-induced hearing loss].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jiao, J; Gu, G Z; Chen, G S; Zheng, Y X; Zhang, H L; Geng, Q; Cheng, Y B; Yu, S F</p> <p>2016-12-20</p> <p>Objective: To investigate the association between serum magnesium ion <span class="hlt">level</span> and risk of <span class="hlt">noise</span>-induced hearing loss (NIHL) . Methods: Acohort study was performed for 7 445 workers exposed to <span class="hlt">noise</span> in the steelmaking and steel rolling workshops of an iron and steel enterprise in Henan Province, China. The follow-up time was from January 1, 2006 to December 31, 2015. The workers with a binaural average high-frequency hearing threshold of ≥40 dB (HL) were enrolled as case group, and those with a binaural average high-frequency hearing threshold of <35 dB (HL) and a binaural average speech frequency of ≤25 dB (HL) were enrolled as control group. After being matched for age, working years of <span class="hlt">noise</span> exposure, sex, and type of work at a ratio of 1∶1, 187 workers each were enrolled in the case group and the control group. Flame atomic absorption spectrometry was used to measure the serum magnesium ionlevel. Aconditional logistic regression analysis was performed to investigate the association of serum magnesium ion <span class="hlt">level</span>, body mass index, cumulative <span class="hlt">noise</span> exposure (CNE) , smoking, drinking, hypertension, and physical exercise with NIHL, as well as the association between serum magnesium ion <span class="hlt">level</span> and risk of NIHL after the adjustment for covariants. Results: There was no significant difference in the serum magnesium ion <span class="hlt">level</span> between the case group and the control group (24.63±7.92 mg/m(3) vs 24.91±7.33 mg/m(3), P>0.05) . Smoking (OR=1.687, 95%CI 1.090-2.613) was a risk factor for NIHL, and physical exercise (OR=0.509, 95%CI 0.325-0.796) reduced the risk of NIHL. In the workers with CNE>98 dB (A) ·year, the risk of NIHL in the workers with higher CNE was 1.305 times (95%CI 1.051-1.620) that in those with lower CNE. After the adjustment for CNE, smoking, and physical exercise, there was no significant difference in the influence of serum magnesium ion <span class="hlt">level</span> on the risk of NIHL between the two groups (P>0.05) . Conclusion: Serum magnesium ion <span class="hlt">level</span> may not be</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4286610','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4286610"><span><span class="hlt">Noise</span> and Low-<span class="hlt">Level</span> Dynamics Can Coordinate Multicomponent Bet Hedging Mechanisms</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Garcia-Bernardo, Javier; Dunlop, Mary J.</p> <p>2015-01-01</p> <p>To counter future uncertainty, cells can stochastically express stress response mechanisms to diversify their population and hedge against stress. This approach allows a small subset of the population to survive without the prohibitive cost of constantly expressing resistance machinery at the population <span class="hlt">level</span>. However, expression of multiple genes in concert is often needed to ensure survival, requiring coordination of infrequent events across many downstream targets. This raises the question of how cells orchestrate the timing of multiple rare events without adding cost. To investigate this, we used a stochastic model to study regulation of downstream target genes by a transcription factor. We compared several upstream regulator profiles, including constant expression, pulsatile dynamics, and noisy expression. We found that pulsatile dynamics and <span class="hlt">noise</span> are sufficient to coordinate expression of multiple downstream genes. Notably, this is true even when fluctuations in the upstream regulator are far below the dissociation constants of the regulated genes, as with infrequently activated genes. As an example, we simulated the dynamics of the multiple antibiotic resistance activator (MarA) and 40 diverse downstream genes it regulates, determining that low-<span class="hlt">level</span> dynamics in MarA are sufficient to coordinate expression of resistance mechanisms. We also demonstrated that <span class="hlt">noise</span> can play a similar coordinating role. Importantly, we found that these benefits are present without a corresponding increase in the population-<span class="hlt">level</span> cost. Therefore, our model suggests that low-<span class="hlt">level</span> dynamics or <span class="hlt">noise</span> in a transcription factor can coordinate expression of multiple stress response mechanisms by engaging them simultaneously without adding to the overall cost. PMID:25564865</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/3954697','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/3954697"><span><span class="hlt">Noise</span> <span class="hlt">levels</span> in cockpits of aircraft during normal cruise and considerations of auditory risk.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gasaway, D C</p> <p>1986-02-01</p> <p><span class="hlt">Noise</span> data, including A-<span class="hlt">levels</span> and C-minus-A values, are summarized for exposures associated with normal cruise flight in 13 groups of 593 aircraft; means and standard deviations are reported; degrees of auditory risk using OSHA-1983 criterion are presented; and at-the-ear protected and unprotected exposures are revealed. Mean A-<span class="hlt">levels</span> were 95.0 for 528 fixed-wing; 100.9 for 65 rotary-wing; and 95.7 for all 593 aircraft. Of 13 sub-groups, the lowest mean A-<span class="hlt">level</span> (85.5) was exhibited in the cockpits of tail-mounted turbojet/fan-powered aircraft, and the highest (105.0) was found in both reciprocating and turbine-powered twin-rotor helicopters. All mean A-<span class="hlt">levels</span> exceeded the OSHA damage-risk criterion for 8 h.d-1 exposures. At-the-ear exposures while wearing hearing protection are presented. Results clearly illustrate the potential for auditory damage of unprotected aircrews. Hearing protection must be considered to effectively control routinely encountered exposures. The material and illustrations resulting from this study will help health and safety monitors during indoctrination and counseling of aircrews concerning the need to protect their hearing against <span class="hlt">noise</span> exposures during normal and routine flight operations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PMB....62..127W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PMB....62..127W"><span>Impact of physiological <span class="hlt">noise</span> correction on detecting blood oxygenation <span class="hlt">level</span>-dependent contrast in the breast</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wallace, Tess E.; Manavaki, Roido; Graves, Martin J.; Patterson, Andrew J.; Gilbert, Fiona J.</p> <p>2017-01-01</p> <p>Physiological fluctuations are expected to be a dominant source of <span class="hlt">noise</span> in blood oxygenation <span class="hlt">level</span>-dependent (BOLD) magnetic resonance imaging (MRI) experiments to assess tumour oxygenation and angiogenesis. This work investigates the impact of various physiological <span class="hlt">noise</span> regressors: retrospective image correction (RETROICOR), heart rate (HR) and respiratory volume per unit time (RVT), on signal variance and the detection of BOLD contrast in the breast in response to a modulated respiratory stimulus. BOLD MRI was performed at 3 T in ten volunteers at rest and during cycles of oxygen and carbogen gas breathing. RETROICOR was optimized using F-tests to determine which cardiac and respiratory phase terms accounted for a significant amount of signal variance. A nested regression analysis was performed to assess the effect of RETROICOR, HR and RVT on the model fit residuals, temporal signal-to-<span class="hlt">noise</span> ratio, and BOLD activation parameters. The optimized RETROICOR model accounted for the largest amount of signal variance ( Δ R\\text{adj}2   =  3.3  ±  2.1%) and improved the detection of BOLD activation (P  =  0.002). Inclusion of HR and RVT regressors explained additional signal variance, but had a negative impact on activation parameter estimation (P  <  0.001). Fluctuations in HR and RVT appeared to be correlated with the stimulus and may contribute to apparent BOLD signal reactivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25797186','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25797186"><span>Low-<span class="hlt">level</span> laser therapy for prevention of <span class="hlt">noise</span>-induced hearing loss in rats.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tamura, Atsushi; Matsunobu, Takeshi; Mizutari, Kunio; Niwa, Katsuki; Kurioka, Takaomi; Kawauchi, Satoko; Satoh, Shunichi; Hiroi, Sadayuki; Satoh, Yasushi; Nibuya, Masashi; Tamura, Risa; Shiotani, Akihiro</p> <p>2015-05-19</p> <p>Noninvasive low-<span class="hlt">level</span> laser therapy (LLLT) is neuroprotective, but the mechanism of this effect is not fully understood. In this study, the use of LLLT as a novel treatment for <span class="hlt">noise</span>-induced hearing loss (NIHL) is investigated. Sprague-Dawley rats were exposed to intense <span class="hlt">noise</span> and their right ears were irradiated with an 808nm diode laser at an output power density of 110 or 165mW/cm(2) for a 30min period for 5 consecutive days. Measurement of the auditory brainstem response revealed an accelerated recovery of auditory function in the groups treated with LLLT compared with the non-treatment group at days 2, 4, 7 and 14 after <span class="hlt">noise</span> exposure. Morphological observations also revealed a significantly higher outer hair cell survival rate in the LLLT groups. Immunohistochemical analyses for inducible nitric oxide synthase (iNOS) and cleaved caspase-3 were used to examine oxidative stress and apoptosis. Strong immunoreactivities were observed in the inner ear tissues of the non-treatment group, whereas these signals were decreased in the LLLT group at 165mW/cm(2) power density. Our findings suggest that LLLT has cytoprotective effects against NIHL via the inhibition of iNOS expression and apoptosis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/16698621','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/16698621"><span><span class="hlt">Acceptability</span> of prenatal HIV screening at the primary care <span class="hlt">level</span> in Nigeria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Daniel, O J; Oladapo, O T</p> <p>2006-04-01</p> <p>A survey of 333 pregnant women receiving antenatal care at the primary healthcare centres in Sagamu Local Government Area of Ogun State, southwest Nigeria was conducted between January and March 2005 to assess the <span class="hlt">acceptability</span> of prenatal HIV screening among them. A total of 325 (97.8%) of the respondents were aware of HIV/AIDS but only 181 (54.3%) of them believed it is a problem in Nigeria. A total of 257 (77.2%) respondents agreed to undergo voluntary counselling and HIV testing (VCT). Multivariate logistic regression analysis of associated factors indicated that being married, self-perception of no risk of HIV infection, awareness of benefits of prenatal HIV testing and Christianity are independent predictors of <span class="hlt">acceptance</span> of prenatal HIV testing in this population. Most of the respondents (78.9%) who were unwilling to take the test cited fear of being infected with its consequences of stigma and discrimination as the reason for their attitude. The survey suggests that a successful integration of VCT programme into the existing primary healthcare services for prevention of vertical HIV transmission is feasible in this part of Nigeria.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhDT........91N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhDT........91N"><span>Low frequency critical current <span class="hlt">noise</span> and two <span class="hlt">level</span> system defects in Josephson junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nugroho, Christopher Daniel</p> <p></p> <p>The critical current in a Josephson junction is known to exhibit a 1/falpha low frequency <span class="hlt">noise</span>. Implemented as a superconducting qubit, this low frequency <span class="hlt">noise</span> can lead to decoherence. While the 1/f <span class="hlt">noise</span> has been known to arise from an ensemble of two <span class="hlt">level</span> systems connected to the tunnel barrier, the precise microscopic nature of these TLSs remain a mystery. In this thesis we will present measurements of the 1/f alpha low frequency <span class="hlt">noise</span> in the critical current and tunneling resistance of Al-AlOx-Al Josephson junctions. Measurements in a wide range of resistively shunted and unshunted junctions confirm the equality of critical current and tunneling resistance <span class="hlt">noise</span>. That is the critical current fluctuation corresponds to fluctuations of the tunneling resistance. In not too small Al-AlOx-Al junctions we have found that the fractional power spectral density scales linearly with temperature. We confirmed that the 1/falpha power spectrum is the result of a large number of two <span class="hlt">level</span> systems modulating the tunneling resistance. At small junction areas and low temperatures, the number of thermally active TLSs is insufficient to integrate out a featureless 1/ f spectral shape. By analyzing the spectral variance in small junction areas, we have been able to deduce the TLS defect density, n ≈ 2.53 per micrometer squared per Kelvin spread in the TLS energy per factor e in the TLS lifetimes. This density is consistent with the density of tunneling TLSs found in glassy insulators, as well as the density deduced from coherent TLSs interacting at qubit frequencies. The deduced TLS density combined with the magnitude of the 1/f power spectral density in large area junctions, gives an average TLS effective area, A ˜ 0.3 nanometer squared. In ultra small tunnel junctions, we have studied the time-domain dynamics of isolated TLSs. We have found a TLS whose dynamics is described by the quantum tunneling between the two localized wells, and a one-phonon absorption</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JSTEd..21..215W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JSTEd..21..215W"><span>Using Science Teaching Case Narratives to Evaluate the <span class="hlt">Level</span> of <span class="hlt">Acceptance</span> of Scientific Inquiry Teaching in Preservice Elementary Teachers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wagler, Ron</p> <p>2010-03-01</p> <p>The National Science Education Standards have outlined flexible processes children perform when engaging in scientific inquiry. Cases narratives are a common component of many university science education courses but rarely are they used as a tool to evaluate the preservice teachers within these courses. This article describes the construction of a positive and negative science teaching case narrative. These case narratives can be used to evaluate the <span class="hlt">level</span> of <span class="hlt">acceptance</span> of scientific inquiry teaching in preservice elementary teachers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28176524','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28176524"><span>Carrier-Number-Fluctuation Induced Ultralow 1/f <span class="hlt">Noise</span> <span class="hlt">Level</span> in Top-Gated Graphene Field Effect Transistor.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Peng, Songang; Jin, Zhi; Zhang, Dayong; Shi, Jingyuan; Mao, Dacheng; Wang, Shaoqing; Yu, Guanghui</p> <p>2017-03-01</p> <p>A top-gated graphene FET with an ultralow 1/f <span class="hlt">noise</span> <span class="hlt">level</span> of 1.8 × 10(-12) μm(2)Hz(1-) (f = 10 Hz) has been fabricated. The <span class="hlt">noise</span> has the least value at Dirac point, it then increases fast when the current deviates from that at Dirac point, the <span class="hlt">noise</span> slightly decreases at large current. The phenomenon can be understood by the carrier-number-fluctuation induced low frequency <span class="hlt">noise</span>, which caused by the trapping-detrapping processes of the carriers. Further analysis suggests that the effect trap density depends on the location of Fermi <span class="hlt">level</span> in graphene channel. The study has provided guidance for suppressing the 1/f <span class="hlt">noise</span> in graphene-based applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/653921','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/653921"><span>Immobilization and Waste Form Product <span class="hlt">Acceptance</span> for Low <span class="hlt">Level</span> and TRU Waste Forms</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Holtzscheiter, E.W.; Harbour, J.R.</p> <p>1998-05-01</p> <p>The Tanks Focus Area is supporting technology development in immobilization of both High <span class="hlt">Level</span> (HLW) and Low <span class="hlt">Level</span> (LLW) radioactive wastes. The HLW process development at Hanford and Idaho is patterned closely after that of the Savannah River (Defense Waste Processing Facility) and West Valley Sites (West Valley Demonstration Project). However, the development and options open to addressing Low <span class="hlt">Level</span> Waste are diverse and often site specific. To start, it is important to understand the breadth of Low <span class="hlt">Level</span> Wastes categories.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4900494','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4900494"><span>DPOAE <span class="hlt">level</span> mapping for detecting <span class="hlt">noise</span>-induced cochlear damage from short-duration music exposures</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Buckey, Jay C.; Fellows, Abigail M.; Clavier, Odile H.; Allen, Lindsay V.; Brooks, Chris A.; Norris, Jesse A.; Gui, Jiang; Meinke, Deanna K.</p> <p>2015-01-01</p> <p>Distortion product otoacoustic emission (DPOAE) <span class="hlt">level</span> mapping provides a comprehensive picture of cochlear responses over a range of DP frequencies and f2/f1 ratios. We hypothesized that individuals exposed to high-<span class="hlt">level</span> sound would show changes detectable by DPOAE mapping, but not apparent on a standard DP-gram. Thirteen normal hearing subjects were studied before and after attending music concerts. Pure-tone audiometry (500-8,000 Hz), DP-grams (0.3-10 kHz) at 1.22 ratio, and DPOAE <span class="hlt">level</span> maps were collected prior to, as soon as possible after, and the day after the concerts. All maps covered the range of 2,000-6,000 Hz in DP frequency and from 1.3 to -1.3 in ratio using equi-<span class="hlt">level</span> primary tone stimuli. Changes in the pure-tone audiogram were significant (P ≤ 0.01) immediately after the concert at 1,000 Hz, 4,000 Hz, and 6,000 Hz. The DP-gram showed significant differences only at f2 = 4,066 (P = 0.01) and f2 = 4,348 (P = 0.04). The postconcert changes were readily apparent both visually and statistically (P ≤ 0.01) on the mean DP <span class="hlt">level</span> maps, and remained statistically significantly different from baseline the day after <span class="hlt">noise</span> exposure although no significant changes from baseline were seen on the DP-gram or audiogram the day after exposure. Although both the DP-gram and audiogram showed recovery by the next day, the average DPOAE <span class="hlt">level</span> maps remained significantly different from baseline. The mapping data showed changes in the cochlea that were not detected from the DP-gram obtained at a single ratio. DPOAE <span class="hlt">level</span> mapping provides comprehensive information on subtle cochlear responses, which may offer advantages for studying and tracking <span class="hlt">noise</span>-induced hearing loss (NIHL). PMID:26356368</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26356368','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26356368"><span>DPOAE <span class="hlt">level</span> mapping for detecting <span class="hlt">noise</span>-induced cochlear damage from short-duration music exposures.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Buckey, Jay C; Fellows, Abigail M; Clavier, Odile H; Allen, Lindsay V; Brooks, Chris A; Norris, Jesse A; Gui, Jiang; Meinke, Deanna K</p> <p>2015-01-01</p> <p>Distortion product otoacoustic emission (DPOAE) <span class="hlt">level</span> mapping provides a comprehensive picture of cochlear responses over a range of DP frequencies and f₂/f₁ratios. We hypothesized that individuals exposed to high-<span class="hlt">level</span> sound would show changes detectable by DPOAE mapping, but not apparent on a standard DP-gram. Thirteen normal hearing subjects were studied before and after attending music concerts. Pure-tone audiometry (500-8,000 Hz), DP-grams (0.3-10 kHz) at 1.22 ratio, and DPOAE <span class="hlt">level</span> maps were collected prior to, as soon as possible after, and the day after the concerts. All maps covered the range of 2,000-6,000 Hz in DP frequency and from 1.3 to -1.3 in ratio using equi-<span class="hlt">level</span> primary tone stimuli. Changes in the pure-tone audiogram were significant (P ≤ 0.01) immediately after the concert at 1,000 Hz, 4,000 Hz, and 6,000 Hz. The DP-gram showed significant differences only at f₂= 4,066 (P = 0.01) and f₂= 4,348 (P = 0.04). The postconcert changes were readily apparent both visually and statistically (P ≤ 0.01) on the mean DP <span class="hlt">level</span> maps, and remained statistically significantly different from baseline the day after <span class="hlt">noise</span> exposure although no significant changes from baseline were seen on the DP-gram or audiogram the day after exposure. Although both the DP-gram and audiogram showed recovery by the next day, the average DPOAE <span class="hlt">level</span> maps remained significantly different from baseline. The mapping data showed changes in the cochlea that were not detected from the DP-gram obtained at a single ratio. DPOAE <span class="hlt">level</span> mapping provides comprehensive information on subtle cochlear responses, which may offer advantages for studying and tracking <span class="hlt">noise</span>-induced hearing loss (NIHL).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/15189073','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/15189073"><span>Combustion process in a spark ignition engine: dynamics and <span class="hlt">noise</span> <span class="hlt">level</span> estimation.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kaminski, T; Wendeker, M; Urbanowicz, K; Litak, G</p> <p>2004-06-01</p> <p>We analyze the experimental time series of internal pressure in a four cylinder spark ignition engine. In our experiment, performed for different spark advance angles, apart from the usual cyclic changes of engine pressure we observed additional oscillations. These oscillations are with longer time scales ranging from one to several hundred engine cycles depending on engine working conditions. Based on the pressure time dependence we have calculated the heat released per combustion cycle. Using the time series of heat release to calculate the correlation coarse-grained entropy we estimated the <span class="hlt">noise</span> <span class="hlt">level</span> for internal combustion process. Our results show that for a larger spark advance angle the system is more deterministic.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1988ElL....24..643A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1988ElL....24..643A"><span>Performance of mean-<span class="hlt">level</span> detector in presence of multiple-tone interference plus <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Al-Hussaini, E. K.</p> <p>1988-05-01</p> <p>Performance of the adaptive mean-<span class="hlt">level</span> constant false alarm rate detector is derived in the presence of multiple-tone interference plus Gaussian <span class="hlt">noise</span>. Such signals may result from jamming, interference, or multipath propagation. A square-law envelope detector is employed and a single sweep or hit is processed. The target signal envelope fluctuates according to a Rayleigh probability density function. The results show that the probability of a false alarm decreases monotonically with increasing interfering tonal SNR per pulse for one tone. The probability is unaffected when there is an infinite number of tones.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26938911','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26938911"><span>Improving patients' sleep: reducing light and <span class="hlt">noise</span> <span class="hlt">levels</span> on wards at night.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hewart, Carol; Fethney, Loveday</p> <p>2016-02-01</p> <p>There is much research concerning the psychological and physical effects of sleep deprivation on patients in healthcare systems, yet interrupted sleep on hospital wards at night remains a problem. Staff at Plymouth Hospitals NHS Trust, Devon, wanted to identify the factors that prevent patients from sleeping well at night. Two audits were carried out, between April and August 2015, to assess <span class="hlt">noise</span> and light <span class="hlt">levels</span> on wards at night, and to engage nurses in ways of reducing these. A number of recommendations were made based on the audit findings, many of which have been put into practice.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002AGUFM.S71A1052S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002AGUFM.S71A1052S"><span>Ambient Seismic <span class="hlt">Noise</span> <span class="hlt">Levels</span> of the Seafloor Borehole Broadband Seismic Observatories in the Northwestern Pacific</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shinohara, M.; Kanazawa, T.; Araki, E.; Suyehiro, K.; Shiobara, H.; Yamada, T.; Nakahigashi, K.; Mikada, H.; Fukao, Y.</p> <p>2002-12-01</p> <p>In 2000 and 2001, the seafloor borehole seismological observatories WP-1 and WP-2 in the northwestern Pacific were successfully installed. The WP-1 site is in the west Philippine Basin west of the Kyushu-Palau Ridge. The WP-2 observatory is situated on a normal oceanic Mesozoic crust in the northwestern Pacific Basin. Both the observatories fill important observational gaps, since no other land site can replace this site. Each observatory has two identical broadband seismometers (Guralp, CMG-1T), which are cemented, near the bottom of the hole. All the necessary power for the WP-1 is supplied from the Lithium Battery System with a capacity of 5.2 kAh. For the WP-2 observatory, the Sea Water Battery (SWB) System mainly supplies the power to the system. Additional lithium batteries were used as a backup system. Both seismometers are operational, but we are operating only one seismometer for both the observatories to reduce the consuming power of the system. The WP-2 observatory was activated in October 2000 using an ROV KAIKO. In August 2001, the KAIKO re-visited the WP-2 site. From the first observation, we obtained about three-months continuous data (Oct. 29th, 2000 - Jan. 27th, 2001). The KAIKO visited the WP-2 site again in June 2002 and approximately eleven-months continuous data (Aug. 3rd, 2001 - Jun. 29th, 2002) were retrieved for second observation period. The KAIKO also recovered the monitoring data for the SWB system. It was confirmed that the SWB system continued working for almost one year. The observation at the WP-1 was started from March 2002. We now have the preliminary data (about 20 minutes long) from during the ROV dive for the activation. A re-visit of the WP-1 site is planned in October 2002. The long-term variations of broadband seismic <span class="hlt">noise</span> spectra (3mHz - 10 Hz) in the northwestern Pacific Basin were revealed. The <span class="hlt">noise</span> <span class="hlt">level</span> above 10 s is stable all the year round. The vertical component of the WP-2 has the <span class="hlt">noise</span> <span class="hlt">level</span> about -145 db (re: 1 m</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFM.S51C2701H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFM.S51C2701H"><span>Seasonal Changes in Atmospheric <span class="hlt">Noise</span> <span class="hlt">Levels</span> and the Annual Variation in Pigeon Homing Performance</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hagstrum, J. T.; McIsaac, H. P.; Drob, D. P.</p> <p>2015-12-01</p> <p>The remarkable navigational ability of homing pigeons (Columba livia) is influenced by a number of factors, an unknown one of which causes the "Wintereffekt"1 or annual variation in homing performance. Minima in homeward orientation and return speeds have been observed in winter, with maxima in summer, during repetitive pigeon releases from single sites near experimental lofts in Wilhelmshaven, Göttingen, and Munich, Germany, and near Pisa, Italy1-4. Overall the annual variation is more pronounced in northern Germany than Italy4, and both mature and juvenile cohorts respond to this seasonal factor. Older, more experienced pigeons are better at compensating for its effects than naïve ones, but are still affected after numerous releases. The narrow low-frequency band of atmospheric background <span class="hlt">noise</span> (microbaroms; 0.1-0.3 Hz) also varies with an annual cycle that generally has higher amplitudes in winter than in summer depending on location5. In addition, homing pigeons, and possibly other birds, apparently use infrasonic signals of similar frequency as navigational cues6, and a seasonal variation in background <span class="hlt">noise</span> <span class="hlt">levels</span> could cause corresponding changes in signal-to-<span class="hlt">noise</span> ratios and thus in homing performance. The annual variation in homing performance, however, was not observed during long-term pigeon releases at two sites in eastern North America. The annual and geographic variability in homing performance in the northern hemisphere can be explained to a first order by seasonal changes in infrasonic <span class="hlt">noise</span> sources related to ocean storm activity, and to the direction and intensity of stratospheric winds. In addition, increased dispersion in departure bearings of individual birds for some North American releases were likely caused by additional infrasonic <span class="hlt">noise</span> associated with severe weather events during tornado and Atlantic hurricane seasons. 1Kramer, G. & von Saint Paul, U., J. Ornithol. 97, 353-370 (1956); 2Wallraff, H. G., Z. Tierpsychol. 17, 82-113 (1960</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.H11H1253S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.H11H1253S"><span>Transfer Function <span class="hlt">Noise</span> (TFN) Modeling of Dynamic Groundwater <span class="hlt">Level</span> Fluctuation using Deseasonalized Rainfall Series</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shanmugam, M.; Kumar, G.; Narasimhan, B.</p> <p>2013-12-01</p> <p>A study to examine the effect of rainfall variable on groundwater <span class="hlt">level</span> fluctuation was analyzed using transfer function <span class="hlt">noise</span> (TFN) models for five representative wells from the study area of Adyar basin located in the north-east coastal part of Tamil Nadu, India. Five representative wells out of 43 were chosen based on maximum coefficient of determination (R2) value by simple linear regression analysis where rainfall and water <span class="hlt">level</span> rise time series were used as independent and dependent variables respectively. An alternative method of zone wise Thiessen rainfall (ZTR), where the zones were separated by Thiessen method and the wells contained in the zones were regressed upon that particular zone station rainfall values with 100% weightage, was giving maximum R2 value compared to other traditional ways of estimating areal average rainfall methods such as simple arithmetic average (SAA) and Thiessen polygon (TP) methods. Water <span class="hlt">level</span> fluctuation was further modeled using TFN modeling approach in which missing rainfall was filled using normal ratio (NR) method as it was giving maximum R2 value compared to simple station average (SSA) and inverse distance (ID) methods. A deseasonalized transfer function <span class="hlt">noise</span> modeling (DS-TFN) approach has been adopted in the study which minimizes the number of numerator and denominator polynomial parameters and assures an improved method of forecasting groundwater <span class="hlt">level</span> fluctuation in terms of maximum R2 and minimum root mean square error (RMSE) values compared to other traditional TFN models such as ARIMAX and SARIMAX. Before identifying suitable TFN model structure for input-output data, the data was analyzed for seasonality. Since both rainfall series and selected water <span class="hlt">level</span> data show the seasonality behavior, it was adjusted with deseasonalizing process. Deseasonalizing process was carried out after detrending the data with 13-term moving average process and estimating seasonal component from the detrended series using seasonal</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19206896','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19206896"><span>Variability in ambient <span class="hlt">noise</span> <span class="hlt">levels</span> and call parameters of North Atlantic right whales in three habitat areas.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Parks, Susan E; Urazghildiiev, Ildar; Clark, Christopher W</p> <p>2009-02-01</p> <p>The North Atlantic right whale inhabits the coastal waters off the east coasts of the United States and Canada, areas characterized by high <span class="hlt">levels</span> of shipping and fishing activities. Acoustic communication plays an important role in the social behavior of these whales and increases in low-frequency <span class="hlt">noise</span> may be leading to changes in their calling behavior. This study characterizes the ambient <span class="hlt">noise</span> <span class="hlt">levels</span>, including both natural and anthropogenic sources, and right whale upcall parameters in three right whale habitat areas. Continuous recordings were made seasonally using autonomous bottom-mounted recorders in the Bay of Fundy, Canada (2004, 2005), Cape Cod Bay, (2005, 2006), and off the coast of Georgia (2004-2005, 2006-2007). Consistent interannual trends in <span class="hlt">noise</span> parameters were found for each habitat area, with both the band <span class="hlt">level</span> and spectrum <span class="hlt">level</span> measurements higher in the Bay of Fundy than in the other areas. Measured call parameters varied between habitats and between years within the same habitat area, indicating that habitat area and <span class="hlt">noise</span> <span class="hlt">levels</span> alone are not sufficient to predict variability in call parameters. These results suggest that right whales may be responding to the peak frequency of <span class="hlt">noise</span>, rather than the absolute <span class="hlt">noise</span> <span class="hlt">level</span> in their environment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000031365','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000031365"><span>Piloted Simulation Study of a Dual Thrust-Cutback Procedure for Reducing High-Speed Civil Transport Takeoff <span class="hlt">Noise</span> <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Riley, Donald R.; Glaab, Louis J.; Brandon, Jay M.; Person, Lee H., Jr.; Glaab, Patricia C.</p> <p>1999-01-01</p> <p>A piloted simulation study was performed for the purpose of indicating the <span class="hlt">noise</span> reduction benefits and piloting performance that could occur for a typical 4-engine high-Speed Civil Transport (HSCT) configuration during takeoff when a dual thrust-cutback procedure was employed with throttle operation under direct computer control. Two thrust cutbacks were employed with the first cutback performed while the vehicle was accelerating on the run-way and the second cutback performed at a distance farther downrange. Added vehicle performance improvements included the incorporation of high-lift increments into the aerodynamic database of the vehicle and the use of limited engine oversizing. Four single-stream turbine bypass engines that had no <span class="hlt">noise</span> suppression of any kind were used with this configuration. This approach permitted establishing the additional <span class="hlt">noise</span> suppression <span class="hlt">level</span> that was needed to meet Federal Air Regulation Part 36 Stage 3 <span class="hlt">noise</span> <span class="hlt">levels</span> for subsonic commercial jet aircraft. <span class="hlt">Noise</span> <span class="hlt">level</span> results were calculated with the jet mixing and shock <span class="hlt">noise</span> modules of the Aircraft <span class="hlt">Noise</span> Prediction Program (ANOPP).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016NaPho..10..406L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016NaPho..10..406L"><span>Efficient and low-<span class="hlt">noise</span> single-photon-<span class="hlt">level</span> frequency conversion interfaces using silicon nanophotonics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Qing; Davanço, Marcelo; Srinivasan, Kartik</p> <p>2016-06-01</p> <p>Optical frequency conversion has applications ranging from tunable light sources to telecommunications-band interfaces for quantum information science. Here, we demonstrate efficient, low-<span class="hlt">noise</span> frequency conversion on a nanophotonic chip through four-wave-mixing Bragg scattering in compact (footprint <0.5 × 10-4 cm2) Si3N4 microring resonators. We investigate three frequency conversion configurations: spectral translation over a few nanometres within the 980 nm band; upconversion from 1,550 nm to 980 nm and downconversion from 980 nm to 1,550 nm. With conversion efficiencies ranging from 25% for the first process to >60% for the last two processes, a signal conversion bandwidth of >1 GHz, a required continuous-wave pump power of <60 mW and background <span class="hlt">noise</span> <span class="hlt">levels</span> between a few femtowatts and a few picowatts, these devices are suitable for quantum frequency conversion of single-photon states from InAs/GaAs quantum dots. Simulations based on coupled mode equations and the Lugiato-Lefever equation are used to model device performance, and show quantitative agreement with measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3384249','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3384249"><span>Mathematical explanation of the predictive power of the X-<span class="hlt">level</span> approach reaction <span class="hlt">noise</span> estimator method</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2012-01-01</p> <p>The X-<span class="hlt">level</span> Approach Reaction <span class="hlt">Noise</span> Estimator (XARNES) method has been developed previously to study reaction <span class="hlt">noise</span> in well mixed reaction volumes. The method is a typical moment closure method and it works by closing the infinite hierarchy of equations that describe moments of the particle number distribution function. This is done by using correlation forms which describe correlation effects in a strict mathematical way. The variable X is used to specify which correlation effects (forms) are included in the description. Previously, it was argued, in a rather informal way, that the method should work well in situations where the particle number distribution function is Poisson-like. Numerical tests confirmed this. It was shown that the predictive power of the method increases, i.e. the agreement between the theory and simulations improves, if X is increased. In here, these features of the method are explained by using rigorous mathematical reasoning. Three derivative matching theoremsare proven which show that the observed numerical behavior is generic to the method. PMID:22500492</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2939612','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2939612"><span>A Dynamic <span class="hlt">Noise</span> <span class="hlt">Level</span> Algorithm for Spectral Screening of Peptide MS/MS Spectra</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2010-01-01</p> <p>Background High-throughput shotgun proteomics data contain a significant number of spectra from non-peptide ions or spectra of too poor quality to obtain highly confident peptide identifications. These spectra cannot be identified with any positive peptide matches in some database search programs or are identified with false positives in others. Removing these spectra can improve the database search results and lower computational expense. Results A new algorithm has been developed to filter tandem mass spectra of poor quality from shotgun proteomic experiments. The algorithm determines the <span class="hlt">noise</span> <span class="hlt">level</span> dynamically and independently for each spectrum in a tandem mass spectrometric data set. Spectra are filtered based on a minimum number of required signal peaks with a signal-to-<span class="hlt">noise</span> ratio of 2. The algorithm was tested with 23 sample data sets containing 62,117 total spectra. Conclusions The spectral screening removed 89.0% of the tandem mass spectra that did not yield a peptide match when searched with the MassMatrix database search software. Only 6.0% of tandem mass spectra that yielded peptide matches considered to be true positive matches were lost after spectral screening. The algorithm was found to be very effective at removal of unidentified spectra in other database search programs including Mascot, OMSSA, and X!Tandem (75.93%-91.00%) with a small loss (3.59%-9.40%) of true positive matches. PMID:20731867</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3433559','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3433559"><span><span class="hlt">Acceptance</span> of Evolution Increases with Student Academic <span class="hlt">Level</span>: A Comparison Between a Secular and a Religious College</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Paz-y-Miño C., Guillermo</p> <p>2012-01-01</p> <p><span class="hlt">Acceptance</span> of evolution among the general public, high schools, teachers, and scientists has been documented in the USA; little is known about college students’ views on evolution; this population is relevant since it transits from a high-school/parent-protective environment to an independent role in societal decisions. Here we compare perspectives about evolution, creationism, and intelligent design (ID) between a secular (S) and a religious (R) college in the Northeastern USA. Interinstitutional comparisons showed that 64% (mean S + R) biology majors vs. 42/62% (S/R) nonmajors supported the exclusive teaching of evolution in science classes; 24/29% (S/R) biology majors vs. 26/38% (S/R) nonmajors perceived ID as both alternative to evolution and/or scientific theory about the origin of life; 76% (mean S + R) biology majors and nonmajors <span class="hlt">accepted</span> evolutionary explanations about the origin of life; 86% (mean S + R) biology majors vs. 79% (mean S + R) nonmajors preferred science courses where human evolution is discussed; 76% (mean S+R) biology majors vs. 79% (mean S + R) nonmajors welcomed questions about evolution in exams and/or thought that such questions should always be in exams; and 66% (mean S + R) biology majors vs. 46% (mean S + R) nonmajors admitted they <span class="hlt">accept</span> evolution openly and/or privately. Intrainstitutional comparisons showed that overall <span class="hlt">acceptance</span> of evolution among biologists (S or R) increased gradually from the freshman to the senior year, due to exposure to upper-division courses with evolutionary content. College curricular/pedagogical reform should fortify evolution literacy at all education <span class="hlt">levels</span>, particularly among nonbiologists. PMID:22957109</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4997269','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4997269"><span>The Impact of Rendered Protein Meal Oxidation <span class="hlt">Level</span> on Shelf-Life, Sensory Characteristics, and <span class="hlt">Acceptability</span> in Extruded Pet Food</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Chanadang, Sirichat; Koppel, Kadri; Aldrich, Greg</p> <p>2016-01-01</p> <p>Simple Summary Sensory analysis was used to determine the changes due to the storage time on extruded pet food prepared from two different rendered protein meals: (i) beef meat and bone meal (BMBM); (ii) chicken byproduct meal (CPBM). Extrusion is a process where feed is pressed through a die in order to create shapes and increase digestibility. Descriptive sensory analysis using a human panel found an increase in undesirable sensory attributes (e.g., oxidized oil, rancid) in extruded pet food over storage time, especially the one prepared from chicken by product meal without antioxidants. The small increase in oxidized and rancid aromas of BMBM samples did not affect pet owners’ <span class="hlt">acceptability</span> of the products. CPBM samples without antioxidants showed a notable increase in oxidized and rancid aroma over storage time and, thus, affected product <span class="hlt">acceptability</span> negatively. This finding indicated that human sensory analysis can be used as a tool to track the changes of pet food characteristics due to storage, as well as estimate the shelf-life of the products. Abstract Pet foods are expected to have a shelf-life for 12 months or more. Sensory analysis can be used to determine changes in products and to estimate products’ shelf-life. The objectives of this study were to (1) investigate how increasing <span class="hlt">levels</span> of oxidation in rendered protein meals used to produce extruded pet food affected the sensory properties and (2) determine the effect of shelf-life on pet owners’ <span class="hlt">acceptability</span> of extruded pet food diet formulated without the use of preservative. Pet food diets contained beef meat bone meal (BMBM) and chicken byproduct meal (CBPM) in which the oxidation was retarded with ethoxyquin, mixed tocopherols, or none at all, and then extruded into dry pet foods. These samples represented low, medium, and high oxidation <span class="hlt">levels</span>, respectively. Samples were stored for 0, 3, 6, 9, and 12 months at ambient temperature. Each time point, samples were evaluated by six highly</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA475834','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA475834"><span>Assessing the <span class="hlt">Acceptance</span> and Functional Value of the Asymmetrical Software Kit (ASK) at the Tactical <span class="hlt">Level</span></span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>2007-12-01</p> <p>Figure 9. Theory of Reasoned Action27 Icek Ajzen’s Theory of Planned Behavior (TPB) posits that attitudes towards behavior and the...www.istheory.yorku.ca/theoryofreasonedaction.htm on 07 Dec 2007. 28 I. Ajzen , Residual Effects of Past on Later Behavior: Habituation and Reasoned...for Intelligence analysis at the Tactical <span class="hlt">level</span>. 51 LIST OF REFERENCES Ajzen , I., Residual Effects of Past on Later Behavior: Habituation and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/7341050','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/7341050"><span>Changes in operant behavior of rats exposed to lead at the <span class="hlt">accepted</span> no-effect <span class="hlt">level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gross-Selbeck, E; Gross-Selbeck, M</p> <p>1981-11-01</p> <p>After weaning, male and female Wistar rats were fed a daily diet containing 1 g lead acetate/kg food until a <span class="hlt">level</span> of about 20 micrograms/100 mL blood was obtained. The male rats were subjected to the different behavioral tests, whereas the females were mated to untreated males and further exposed until weaning of the offspring. Behavioral testing of the male offspring was performed between 3 and 4 months of age. General behavior of both groups was tested in the open-field task including locomotion, local movements, and emotionality. The conditioned instrumental behavior was tested in the Skinner box from simple to more complex programs. The blood-lead <span class="hlt">level</span> was measured by flameless atomic absorption spectrometry. No behavioral changes became apparent in the open-field task and in the preliminary operant training. In the more complex programs (DRH = Differential Reinforcement of High Rates), the rats exposed to lead after weaning showed slight changes of DRH performance. By contrast, in pre- and neonatally exposed animals, DRH performance was significantly increased, although blood-lead <span class="hlt">levels</span> had returned to normal at the time of testing. A comparison of lead effects in animals to possible effects in man is discussed in this paper, and it is concluded that lead exposure to man at doses which presently are suggested to be innocuous may result in subclinical functional changes of the central nervous system.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19740023394','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19740023394"><span>Simulator study of minimum <span class="hlt">acceptable</span> <span class="hlt">level</span> of longitudinal stability for a representative STOL configuration during landing approach</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Grantham, W. D.; Deal, P. L.</p> <p>1974-01-01</p> <p>A fixed-base simulator study was conducted to determine the minimum <span class="hlt">acceptable</span> <span class="hlt">level</span> of longitudinal stability for a representative turbofan STOL (short take-off and landing) transport airplane during the landing approach. Real-time digital simulation techniques were used. The computer was programed with equations of motion for six degrees of freedom, and the aerodynamic inputs were based on measured wind-tunnel data. The primary piloting task was an instrument approach to a breakout at a 60-m (200-ft) ceiling.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20090043801','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20090043801"><span><span class="hlt">Noise</span> Control in Space Shuttle Orbiter</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Goodman, Jerry R.</p> <p>2009-01-01</p> <p>Acoustic limits in habitable space enclosures are required to ensure crew safety, comfort, and habitability. <span class="hlt">Noise</span> control is implemented to ensure compliance with the acoustic requirements. The purpose of this paper is to describe problems with establishing acoustic requirements and <span class="hlt">noise</span> control efforts, and present examples of <span class="hlt">noise</span> control treatments and design applications used in the Space Shuttle Orbiter. Included is the need to implement the design discipline of acoustics early in the design process, and <span class="hlt">noise</span> control throughout a program to ensure that limits are met. The use of dedicated personnel to provide expertise and oversight of acoustic requirements and <span class="hlt">noise</span> control implementation has shown to be of value in the Space Shuttle Orbiter program. It is concluded that to achieve <span class="hlt">acceptable</span> and safe <span class="hlt">noise</span> <span class="hlt">levels</span> in the crew habitable space, early resolution of acoustic requirements and implementation of effective <span class="hlt">noise</span> control efforts are needed. Management support of established acoustic requirements and <span class="hlt">noise</span> control efforts is essential.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5010391','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5010391"><span>Effects of <span class="hlt">Noise</span> Exposure on Systemic and Tissue-<span class="hlt">Level</span> Markers of Glucose Homeostasis and Insulin Resistance in Male Mice</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Liu, Lijie; Wang, Fanfan; Lu, Haiying; Cao, Shuangfeng; Du, Ziwei; Wang, Yongfang; Feng, Xian; Gao, Ye; Zha, Mingming; Guo, Min; Sun, Zilin; Wang, Jian</p> <p>2016-01-01</p> <p>Background: Epidemiological studies have indicated that <span class="hlt">noise</span> exposure is associated with an increased risk of type 2 diabetes mellitus (T2DM). However, the nature of the connection between <span class="hlt">noise</span> exposure and T2DM remains to be explored. Objectives: We explored whether and how <span class="hlt">noise</span> exposure affects glucose homeostasis in mice as the initial step toward T2DM development. Methods: Male ICR mice were randomly assigned to one of four groups: the control group and three <span class="hlt">noise</span> groups (N20D, N10D, and N1D), in which the animals were exposed to white <span class="hlt">noise</span> at 95 decibel sound pressure <span class="hlt">level</span> (dB SPL) for 4 hr per day for 20 successive days, 10 successive days, or 1 day, respectively. Glucose tolerance and insulin sensitivity were evaluated 1 day, 1 week, and 1 month after the final <span class="hlt">noise</span> exposure (1DPN, 1WPN, and 1MPN). Standard immunoblots, immunohistochemical methods, and enzyme-linked immunosorbent assays (ELISA) were performed to assess insulin signaling in skeletal muscle, the morphology of β cells, and plasma corticosterone <span class="hlt">levels</span>. Results: <span class="hlt">Noise</span> exposure for 1 day caused transient glucose intolerance and insulin resistance, whereas <span class="hlt">noise</span> exposure for 10 and 20 days had no effect on glucose tolerance but did cause prolonged insulin resistance and an increased insulin response to glucose challenge. Akt phosphorylation and GLUT4 translocation in response to exogenous insulin were decreased in the skeletal muscle of <span class="hlt">noise</span>-exposed animals. Conclusions: <span class="hlt">Noise</span> exposure at 95 dB SPL caused insulin resistance in male ICR mice, which was prolonged with longer <span class="hlt">noise</span> exposure and was likely related to the observed blunted insulin signaling in skeletal muscle. Citation: Liu L, Wang F, Lu H, Cao S, Du Z, Wang Y, Feng X, Gao Y, Zha M, Guo M, Sun Z, Wang J. 2016. Effects of <span class="hlt">noise</span> exposure on systemic and tissue-<span class="hlt">level</span> markers of glucose homeostasis and insulin resistance in male mice. Environ Health Perspect 124:1390–1398; http://dx.doi.org/10.1289/EHP162 PMID:27128844</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JEI....25a3029X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JEI....25a3029X"><span>Quality-aware features-based <span class="hlt">noise</span> <span class="hlt">level</span> estimator for block matching and three-dimensional filtering algorithm</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xu, Shaoping; Hu, Lingyan; Yang, Xiaohui</p> <p>2016-01-01</p> <p>The performance of conventional denoising algorithms is usually controlled by one or several parameters whose optimal settings depend on the contents of the processed images and the characteristics of the <span class="hlt">noises</span>. Among these parameters, <span class="hlt">noise</span> <span class="hlt">level</span> is a fundamental parameter that is always assumed to be known by most of the existing denoising algorithms (so-called nonblind denoising algorithms), which largely limits the applicability of these nonblind denoising algorithms in many applications. Moreover, these nonblind algorithms do not always achieve the best denoised images in visual quality even when fed with the actual <span class="hlt">noise</span> <span class="hlt">level</span> parameter. To address these shortcomings, in this paper we propose a new quality-aware features-based <span class="hlt">noise</span> <span class="hlt">level</span> estimator (NLE), which consists of quality-aware features extraction and optimal <span class="hlt">noise</span> <span class="hlt">level</span> parameter prediction. First, considering that image local contrast features convey important structural information that is closely related to image perceptual quality, we utilize the marginal statistics of two local contrast operators, i.e., the gradient magnitude and the Laplacian of Gaussian (LOG), to extract quality-aware features. The proposed quality-aware features have very low computational complexity, making them well suited for time-constrained applications. Then we propose a learning-based framework where the <span class="hlt">noise</span> <span class="hlt">level</span> parameter is estimated based on the quality-aware features. Based on the proposed NLE, we develop a blind block matching and three-dimensional filtering (BBM3D) denoising algorithm which is capable of effectively removing additive white Gaussian <span class="hlt">noise</span>, even coupled with impulse <span class="hlt">noise</span>. The <span class="hlt">noise</span> <span class="hlt">level</span> parameter of the BBM3D algorithm is automatically tuned according to the quality-aware features, guaranteeing the best performance. As such, the classical block matching and three-dimensional algorithm can be transformed into a blind one in an unsupervised manner. Experimental results demonstrate that the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27483326','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27483326"><span>The Impact of Rendered Protein Meal Oxidation <span class="hlt">Level</span> on Shelf-Life, Sensory Characteristics, and <span class="hlt">Acceptability</span> in Extruded Pet Food.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chanadang, Sirichat; Koppel, Kadri; Aldrich, Greg</p> <p>2016-07-28</p> <p>Pet foods are expected to have a shelf-life for 12 months or more. Sensory analysis can be used to determine changes in products and to estimate products' shelf-life. The objectives of this study were to (1) investigate how increasing <span class="hlt">levels</span> of oxidation in rendered protein meals used to produce extruded pet food affected the sensory properties and (2) determine the effect of shelf-life on pet owners' <span class="hlt">acceptability</span> of extruded pet food diet formulated without the use of preservative. Pet food diets contained beef meat bone meal (BMBM) and chicken byproduct meal (CBPM) in which the oxidation was retarded with ethoxyquin, mixed tocopherols, or none at all, and then extruded into dry pet foods. These samples represented low, medium, and high oxidation <span class="hlt">levels</span>, respectively. Samples were stored for 0, 3, 6, 9, and 12 months at ambient temperature. Each time point, samples were evaluated by six highly trained descriptive panelists for sensory attributes related to oxidation. Samples without preservatives were chosen for the <span class="hlt">acceptability</span> test, since the differences in sensory characteristics over storage time were more distinguishable in those samples. Pet owners evaluated samples for aroma, appearance and overall liking. Descriptive sensory analysis detected significant changes in oxidized-related sensory characteristics over storage time. However, the differences for CBPM samples were more pronounced and directional. The consumer study showed no differences in pet owners' <span class="hlt">acceptability</span> for BMBM samples. However, the noticeable increase in aroma characteristics (rancid aroma 0.33-4.21) in CBPM samples over storage time did have a negative effect on consumer's liking (overall liking 5.52-4.95).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4109949','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4109949"><span>Increased <span class="hlt">Noise</span> <span class="hlt">Levels</span> Have Different Impacts on the Anti-Predator Behaviour of Two Sympatric Fish Species</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Voellmy, Irene K.; Purser, Julia; Simpson, Stephen D.; Radford, Andrew N.</p> <p>2014-01-01</p> <p>Animals must avoid predation to survive and reproduce, and there is increasing evidence that man-made (anthropogenic) factors can influence predator−prey relationships. Anthropogenic <span class="hlt">noise</span> has been shown to have a variety of effects on many species, but work investigating the impact on anti-predator behaviour is rare. In this laboratory study, we examined how additional <span class="hlt">noise</span> (playback of field recordings of a ship passing through a harbour), compared with control conditions (playback of recordings from the same harbours without ship <span class="hlt">noise</span>), affected responses to a visual predatory stimulus. We compared the anti-predator behaviour of two sympatric fish species, the three-spined stickleback (Gasterosteus aculeatus) and the European minnow (Phoxinus phoxinus), which share similar feeding and predator ecologies, but differ in their body armour. Effects of additional-<span class="hlt">noise</span> playbacks differed between species: sticklebacks responded significantly more quickly to the visual predatory stimulus during additional-<span class="hlt">noise</span> playbacks than during control conditions, while minnows exhibited no significant change in their response latency. Our results suggest that elevated <span class="hlt">noise</span> <span class="hlt">levels</span> have the potential to affect anti-predator behaviour of different species in different ways. Future field-based experiments are needed to confirm whether this effect and the interspecific difference exist in relation to real-world <span class="hlt">noise</span> sources, and to determine survival and population consequences. PMID:25058618</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25058618','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25058618"><span>Increased <span class="hlt">noise</span> <span class="hlt">levels</span> have different impacts on the anti-predator behaviour of two sympatric fish species.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Voellmy, Irene K; Purser, Julia; Simpson, Stephen D; Radford, Andrew N</p> <p>2014-01-01</p> <p>Animals must avoid predation to survive and reproduce, and there is increasing evidence that man-made (anthropogenic) factors can influence predator-prey relationships. Anthropogenic <span class="hlt">noise</span> has been shown to have a variety of effects on many species, but work investigating the impact on anti-predator behaviour is rare. In this laboratory study, we examined how additional <span class="hlt">noise</span> (playback of field recordings of a ship passing through a harbour), compared with control conditions (playback of recordings from the same harbours without ship <span class="hlt">noise</span>), affected responses to a visual predatory stimulus. We compared the anti-predator behaviour of two sympatric fish species, the three-spined stickleback (Gasterosteus aculeatus) and the European minnow (Phoxinus phoxinus), which share similar feeding and predator ecologies, but differ in their body armour. Effects of additional-<span class="hlt">noise</span> playbacks differed between species: sticklebacks responded significantly more quickly to the visual predatory stimulus during additional-<span class="hlt">noise</span> playbacks than during control conditions, while minnows exhibited no significant change in their response latency. Our results suggest that elevated <span class="hlt">noise</span> <span class="hlt">levels</span> have the potential to affect anti-predator behaviour of different species in different ways. Future field-based experiments are needed to confirm whether this effect and the interspecific difference exist in relation to real-world <span class="hlt">noise</span> sources, and to determine survival and population consequences.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/8180434','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/8180434"><span>Preferred real-ear insertion gain on a commercial hearing aid at different speech and <span class="hlt">noise</span> <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kuk, F K; Harper, T; Doubek, K</p> <p>1994-03-01</p> <p>In the present study, we measured preferred real-ear insertion gain (REIG) under different <span class="hlt">levels</span> of speech and <span class="hlt">noise</span> to assess whether current automatic gain control (AGC) and automatic signal processing (ASP) hearing aids are operating optimally. Preferred REIG for optimal speech clarity was determined under seven speech and <span class="hlt">noise</span> conditions. In four conditions, speech (discourse passages) was varied from 55 dB SPL to 85 dB SPL in 10-dB steps at a fixed signal-to-<span class="hlt">noise</span> ratio (S/N) of +5. In the remaining conditions, speech was fixed at 65 dB SPL while the <span class="hlt">noise</span> <span class="hlt">level</span> was varied in 5-dB steps to yield S/Ns from +10 to -5. The results showed that subjects selected less gain as speech or <span class="hlt">noise</span> <span class="hlt">levels</span> were increased. In general, less overall gain was selected as speech <span class="hlt">level</span> was increased, and less overall gain, especially in the low-frequency region, was selected as the S/N ratio became progressively poorer. These results are discussed in relation to how hearing aids with adaptive frequency/gain responses should respond to varying input <span class="hlt">levels</span> to achieve optimal clarity of speech.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000101661','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000101661"><span>Current Background <span class="hlt">Noise</span> Sources and <span class="hlt">Levels</span> in the NASA Ames 40- by 80-Foot Wind Tunnel: A Status Report</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Allen, Christopher S.; Jaeger, Stephen; Soderman, Paul; Koga, Dennis (Technical Monitor)</p> <p>1999-01-01</p> <p>Background <span class="hlt">noise</span> measurements were made of the acoustic environment in the National Full-Scale Aerodynamics Complex 40- by 80-Foot Wind Tunnel (40x80) at NASA Ames Research Center. The measurements were acquired subsequent to the 40x80 Aeroacoustic Modernization Project, which was undertaken to improve the anechoic characteristics of the 40x80's closed test section as well as reduce the <span class="hlt">levels</span> of background <span class="hlt">noise</span> in the facility. The resulting 40x80 anechoic environment was described by Soderman et. al., and the current paper describes the resulting 40x80 background <span class="hlt">noise</span>, discusses the sources of the <span class="hlt">noise</span>, and draws comparisons to previous 40x80 background <span class="hlt">noise</span> <span class="hlt">levels</span> measurements. At low wind speeds or low frequencies, the 40x80 background <span class="hlt">noise</span> is dominated by the fan drive system. To obtain the lowest fan drive <span class="hlt">noise</span> for a given tunnel condition, it is possible in the 40x80 to reduce the fans' rotational speed and adjust the fans' blade pitch, as described by Schmidtz et. al. This idea is not new, but has now been operationally implemented with modifications for increased power at low rotational speeds. At low to mid-frequencies and at higher wind speeds, the dominant <span class="hlt">noise</span> mechanism was thought to be caused by the surface interface of the previous test section floor acoustic lining. In order to reduce this <span class="hlt">noise</span> mechanism, the new test section floor lining was designed to resist the pumping of flow in and out of the space between the grating slats required to support heavy equipment. In addition, the lining/flow interface over the entire test section was designed to be smoother and quieter than the previous design. At high wind speeds or high frequencies, the dominant source of background <span class="hlt">noise</span> in the 40x80 is believed to be caused by the response of the in-flow microphone probes (required by the nature of the closed test section) to the fluctuations in the freestream flow. The resulting background <span class="hlt">noise</span> <span class="hlt">levels</span> are also different for probes of various</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=noise+AND+environment&pg=6&id=EJ811675','ERIC'); return false;" href="http://eric.ed.gov/?q=noise+AND+environment&pg=6&id=EJ811675"><span>Sound Pressure <span class="hlt">Levels</span> Measured in a University Concert Band: A Risk of <span class="hlt">Noise</span>-Induced Hearing Loss?</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Holland, Nicholas V., III</p> <p>2008-01-01</p> <p>Researchers have reported public school band directors as experiencing <span class="hlt">noise</span>-induced hearing loss. Little research has focused on collegiate band directors and university student musicians. The present study measures the sound pressure <span class="hlt">levels</span> generated within a university concert band and compares sound <span class="hlt">levels</span> with the criteria set by the…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EGUGA..15.5369M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EGUGA..15.5369M"><span>Improvement of the <span class="hlt">noise</span> <span class="hlt">level</span> of the Split Langmuir Probe - a spatial current density meter</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Marusenkov, Andriy; Dudkin, Fedor; Shuvalov, Valentyn</p> <p>2013-04-01</p> <p> laboratory test bench as well as in the plasma-dynamic vacuum chamber. These test show that the sensor <span class="hlt">noise</span> <span class="hlt">level</span> is decreased approximately 3-5 times. This study was supported by the SSAU contract # 1550.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.S51A2281E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.S51A2281E"><span>Ambient seismic <span class="hlt">noise</span> <span class="hlt">levels</span>: A survey of the permanent and temporary seismographic networks in Morocco, North Africa</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>El Fellah, Y.; Khairy Abd Ed-Aal, A.; El Moudnib, L.; Mimoun, H.; Villasenor, A.; Gallart, J.; Thomas, C.; Elouai, D.; Mimoun, C.; Himmi, M.</p> <p>2013-12-01</p> <p>Abstract The results, of a conducted study carried out to analyze variations in ambient seismic <span class="hlt">noise</span> <span class="hlt">levels</span> at sites of the installed broadband stations in Morocco, North Africa, are obtained. The permanent and the temporary seismic stations installed in Morocco of the Scientific Institute ( IS, Rabat, Morocco), institute de Ciencias de la Tierra Jaume almera (ICTJA, Barcelona, Spain) and Institut für Geophysik (Munster, Germany) were used in this study. In this work, we used 23 broadband seismic stations installed in different structural domains covering all Morocco from south to north. The main purposes of the current study are: 1) to present a catalog of seismic background <span class="hlt">noise</span> spectra for Morocco obtained from recently installed broadband stations, 2) to assess the effects of experimental temporary seismic vault construction, 3) to determine the time needed for <span class="hlt">noise</span> at sites to stabilize, 4) to establish characteristics and origin of seismic <span class="hlt">noise</span> at those sites. We calculated power spectral densities of background <span class="hlt">noise</span> for each component of each broadband seismometer deployed in the different investigated sites and then compared them with the high-<span class="hlt">noise</span> model and low-<span class="hlt">noise</span> Model of Peterson (1993). All segments from day and night local time windows were included in the calculation without parsing out earthquakes. The obtained results of the current study could be used forthcoming to evaluate permanent station quality. Moreover, this study could be considered as a first step to develop new seismic <span class="hlt">noise</span> models in North Africa not included in Peterson (1993). Keywords Background <span class="hlt">noise</span>; Power spectral density; Model of Peterson; Scientific Institute; Institute de Ciencias de la Tierra Jaume almera; Institut für Geophysik</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24606254','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24606254"><span>Long term estimations of low frequency <span class="hlt">noise</span> <span class="hlt">levels</span> over water from an off-shore wind farm.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bolin, Karl; Almgren, Martin; Ohlsson, Esbjörn; Karasalo, Ilkka</p> <p>2014-03-01</p> <p>This article focuses on computations of low frequency sound propagation from an off-shore wind farm. Two different methods for sound propagation calculations are combined with meteorological data for every 3 hours in the year 2010 to examine the varying <span class="hlt">noise</span> <span class="hlt">levels</span> at a reception point at 13 km distance. It is shown that sound propagation conditions play a vital role in the <span class="hlt">noise</span> impact from the off-shore wind farm and ordinary assessment methods can become inaccurate at longer propagation distances over water. Therefore, this paper suggests that methodologies to calculate <span class="hlt">noise</span> immission with realistic sound speed profiles need to be combined with meteorological data over extended time periods to evaluate the impact of low frequency <span class="hlt">noise</span> from modern off-shore wind farms.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20859870','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20859870"><span><span class="hlt">Noise</span> exposure in movie theaters: a preliminary study of sound <span class="hlt">levels</span> during the showing of 25 films.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Warszawa, Anna; Sataloff, Robert T</p> <p>2010-09-01</p> <p>The harmful effects of <span class="hlt">noise</span> exposure during leisure-time activities are beginning to receive some scrutiny. We conducted a preliminary study to investigate the <span class="hlt">noise</span> <span class="hlt">levels</span> during the showings of 25 different films. During each screening, various sound measurements were made with a dosimeter. The movies were classified on the basis of both their Motion Picture Association of America (MPAA) rating and their genre, and the size of the theater and the size of the audience were taken into consideration in the final analysis. Our findings suggest that the sound <span class="hlt">levels</span> of many movies might be harmful to hearing, although we can draw no definitive conclusions. We did not discern any relationship between <span class="hlt">noise</span> <span class="hlt">levels</span> and either MPAA rating or genre. Further studies are recommended.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Acceptance+AND+Tests&pg=5&id=EJ995162','ERIC'); return false;" href="http://eric.ed.gov/?q=Acceptance+AND+Tests&pg=5&id=EJ995162"><span>A Study to Develop a Scale for Determining the Social <span class="hlt">Acceptance</span> <span class="hlt">Levels</span> of Special-Needs Students, Participating in Inclusion Practices</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Arslan, Erdinc; Sahbaz, Umit</p> <p>2012-01-01</p> <p>The aim of this study is to develop a scale of social <span class="hlt">acceptance</span> for determining the social <span class="hlt">acceptance</span> <span class="hlt">levels</span> of special-needs students, participating in inclusion practices. The target population of the research is 8th grade students of all primary schools in the provincial center of Burdur in the 2008 to 2009 academic year and the target study…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4064894','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4064894"><span>Acoustic <span class="hlt">Noise</span> <span class="hlt">Levels</span> of Dental Equipments and Its Association with Fear and Annoyance <span class="hlt">Levels</span> among Patients Attending Different Dental Clinic Setups in Jaipur, India</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ganta, Shravani; Nagaraj, Anup; Pareek, Sonia; Atri, Mansi; Singh, Kushpal; Sidiq, Mohsin</p> <p>2014-01-01</p> <p>Background: <span class="hlt">Noise</span> is a source of pervasive occupational hazard for practicing dentists and the patients. The sources of dental sounds by various dental equipments can pose as a potential hazard to hearing system and add to the annoyance <span class="hlt">levels</span> of the patients. The aim of the study was to analyze the <span class="hlt">noise</span> <span class="hlt">levels</span> from various equipments and evaluate the effect of acoustic <span class="hlt">noise</span> stimulus on dental fear and annoyance <span class="hlt">levels</span> among patients attending different dental clinic setups in Jaipur, India. Methodology: The sampling frame comprised of 180 patients, which included 90 patients attending 10 different private clinics and 90 patients attending a Dental College in Jaipur. The <span class="hlt">levels</span> of Acoustic <span class="hlt">Noise</span> Stimulus originating from different equipments were determined using a precision sound <span class="hlt">level</span> meter/decibulometer. Dental fear among patients was measured using Dental Fear Scale (DFS). Results: Statistical analysis was performed using chi square test and unpaired t-test. The mean background <span class="hlt">noise</span> <span class="hlt">levels</span> were found to be maximum in the pre-clinical setup/ laboratory areas (69.23+2.20). Females and the patients attending dental college setup encountered more fear on seeing the drill as compared to the patients attending private clinics (p<0.001). Conclusion: The sources of dental sounds can pose as a potential hazard to hearing system. It was analyzed that the environment in the clinics can directly have an effect on the fear and annoyance <span class="hlt">levels</span> of patients. Hence it is necessary control the <span class="hlt">noise</span> from various dental equipments to reduce the fear of patients from visiting a dental clinic. PMID:24959512</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22527469','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22527469"><span>Determination of an <span class="hlt">acceptable</span> assimilable organic carbon (AOC) <span class="hlt">level</span> for biological stability in water distribution systems with minimized chlorine residual.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ohkouchi, Yumiko; Ly, Bich Thuy; Ishikawa, Suguru; Kawano, Yoshihiro; Itoh, Sadahiko</p> <p>2013-02-01</p> <p>There is considerable interest in minimizing the chlorine residual in Japan because of increasing complaints about a chlorinous odor in drinking water. However, minimizing the chlorine residual causes the microbiological water quality to deteriorate, and stricter control of biodegradable organics in finished water is thus needed to maintain biological stability during water distribution. In this investigation, an <span class="hlt">acceptable</span> <span class="hlt">level</span> of assimilable organic carbon (AOC) for biologically stable water with minimized chlorine residual was determined based on the relationship between AOC, the chlorine residual, and bacterial regrowth. In order to prepare water samples containing lower AOC, the fractions of AOC and biodegradable organic matter (BOM) in tap water samples were reduced by converting into biomass after thermal hydrolysis of BOM at alkaline conditions. The batch-mode incubations at different conditions of AOC and chlorine residual were carried out at 20 °C, and the presence or absence of bacterial regrowth was determined. The determined curve for biologically stable water indicated that the <span class="hlt">acceptable</span> AOC was 10.9 μg C/L at a minimized chlorine residual (0.05 mg Cl(2)/L). This result indicated that AOC removal during current water treatment processes in Japan should be significantly enhanced prior to minimization of the chlorine residual in water distribution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4911605','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4911605"><span>Feedback damping of a microcantilever at room temperature to the minimum vibration amplitude limited by the <span class="hlt">noise</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Kawamura, Y.; Kanegae, R.</p> <p>2016-01-01</p> <p>Cooling the vibration amplitude of a microcantilever as low as possible is important to improve the sensitivity and resolutions of various types of scanning type microscopes and sensors making use of it. When the vibration amplitude is controlled to be smaller using a feed back control system, it is known that the obtainable minimum amplitude of the vibration is limited by the floor <span class="hlt">noise</span> <span class="hlt">level</span> of the detection system. In this study, we demonstrated that the amplitude of the thermal vibration of a microcantilever was suppressed to be about 0.15 pmHz−1/2, which is the same value with the floor <span class="hlt">noise</span> <span class="hlt">level</span>, without the assistance of external cryogenic cooling. We think that one of the reason why we could reach the smaller amplitude at room temperature is due to stiffer spring constant of the lever, which leads to higher natural frequency and consequently lower floor <span class="hlt">noise</span> <span class="hlt">level</span>. The other reason is considered to be due to the increase in the laser power for the diagnostics, which lead to the decrease in the signal to <span class="hlt">noise</span> ratio determined by the optical shot <span class="hlt">noise</span>. PMID:27312284</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016NatSR...627843K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016NatSR...627843K"><span>Feedback damping of a microcantilever at room temperature to the minimum vibration amplitude limited by the <span class="hlt">noise</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kawamura, Y.; Kanegae, R.</p> <p>2016-06-01</p> <p>Cooling the vibration amplitude of a microcantilever as low as possible is important to improve the sensitivity and resolutions of various types of scanning type microscopes and sensors making use of it. When the vibration amplitude is controlled to be smaller using a feed back control system, it is known that the obtainable minimum amplitude of the vibration is limited by the floor <span class="hlt">noise</span> <span class="hlt">level</span> of the detection system. In this study, we demonstrated that the amplitude of the thermal vibration of a microcantilever was suppressed to be about 0.15 pmHz‑1/2, which is the same value with the floor <span class="hlt">noise</span> <span class="hlt">level</span>, without the assistance of external cryogenic cooling. We think that one of the reason why we could reach the smaller amplitude at room temperature is due to stiffer spring constant of the lever, which leads to higher natural frequency and consequently lower floor <span class="hlt">noise</span> <span class="hlt">level</span>. The other reason is considered to be due to the increase in the laser power for the diagnostics, which lead to the decrease in the signal to <span class="hlt">noise</span> ratio determined by the optical shot <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19760019862','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19760019862"><span><span class="hlt">Noise</span> measurements for a twin-engine commercial jet aircraft during 3 deg approaches and <span class="hlt">level</span> flyovers</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hastings, E. C., Jr.; Shanks, R. E.; Mueller, A. W.</p> <p>1976-01-01</p> <p><span class="hlt">Noise</span> measurements have been made with a twin-engine commercial jet aircraft making 3 deg approaches and <span class="hlt">level</span> flyovers. The flight-test data showed that, in the standard 3 deg approach configuration with 40 deg flaps, effective perceived <span class="hlt">noise</span> <span class="hlt">level</span> (EPNL) had a value of 109.5 effective perceived <span class="hlt">noise</span> decibels (EPNdB). This result was in agreement with unpublished data obtained with the same type of aircraft during <span class="hlt">noise</span> certification tests; the 3 deg approaches made with 30 deg flaps and slightly reduced thrust reduced the EPNL value by 1 EPNdB. Extended center-line <span class="hlt">noise</span> determined during the 3 deg approaches with 40 deg flaps showed that the maximum reference A-weighted sound pressure <span class="hlt">level</span> (LA,max)ref varied from 100.0 A-weighted decibels 2.01 km (108 n. mi.) from the threshold to 87.4 db(A) at 6.12 km (3.30 n. mi.) from the threshold. These test values were about 3 db(A) higher than estimates used for comparison. The test data along the extended center line during approaches with 30 deg flaps were 1 db(A) lower than those for approaches with 40 deg flaps. Flight-test data correlating (LA,max)ref with thrust at altitudes of 122 m (400 ft) and 610 m (2000 ft) were in agreement with reference data used for comparison.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/330572','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/330572"><span>Product <span class="hlt">acceptance</span> of a certified Class C low-<span class="hlt">level</span> waste form at the West Valley Demonstration Project</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Valenti, P.J.; Maestas, E.; Yeazel, J.A.; McIntosh, T.W.</p> <p>1989-11-01</p> <p>The Department of Energy, is charged with the solidification of high-<span class="hlt">level</span> liquid waste (HLW) remaining from nuclear fuel reprocessing activities, which were conducted at West Valley, New York between 1966 and 1972. One important aspect of the West Valley Demonstration Project`s fully integrated waste program is the treatment and conditioning of low-<span class="hlt">level</span> wastes which result from processing liquid high-<span class="hlt">level</span> waste. The treatment takes place in the project`s Integrated Radwaste Treatment System which removes Cesium-137 from the liquid or supernatant phase of the HLW by utilizing an ion exchange technique. The resulting decontaminated and conditioned liquid waste stream is solidified into a Class C low-<span class="hlt">level</span> cement waste form that meets the waste form criteria specified in NRC 10 CFR 61. The waste matrix is placed in 71-gallon square drums, remotely handled and stored on site until determination of final disposition. This paper discusses the programs in place at West Valley to ensure production of an <span class="hlt">acceptable</span> cement-based product. Topics include the short and long term test programs to predict product storage and disposal performance, description of the Process Control Plan utilized to control and maintain cement waste form product specifications and finally discuss the operational performance characteristics of the Integrated Radwaste Treatment System. Operational data and product statistics are provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20136203','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20136203"><span><span class="hlt">Noise</span>-induced annoyance from transportation <span class="hlt">noise</span>: short-term responses to a single <span class="hlt">noise</span> source in a laboratory.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kim, Jaehwan; Lim, Changwoo; Hong, Jiyoung; Lee, Soogab</p> <p>2010-02-01</p> <p>An experimental study was performed to compare the annoyances from civil-aircraft <span class="hlt">noise</span>, military-aircraft <span class="hlt">noise</span>, railway <span class="hlt">noise</span>, and road-traffic <span class="hlt">noise</span>. Two-way within-subjects designs were applied in this research. Fifty-two subjects, who were naive listeners, were given various stimuli with varying <span class="hlt">levels</span> through a headphone in an anechoic chamber. Regardless of the frequency weighting network, even under the same average energy <span class="hlt">level</span>, civil-aircraft <span class="hlt">noise</span> was the most annoying, followed by military-aircraft <span class="hlt">noise</span>, railway <span class="hlt">noise</span>, and road-traffic <span class="hlt">noise</span>. In particular, penalties in the time-averaged, A-weighted sound <span class="hlt">level</span> (TAL) of about 8, 5, and 5 dB, respectively, were found in the civil-aircraft, military-aircraft, and railway <span class="hlt">noises</span>. The reason could be clarified through the high-frequency component and the variability in the <span class="hlt">level</span>. When people were exposed to sounds with the same maximum A-weighted <span class="hlt">level</span>, a railway bonus of about 3 dB was found. However, transportation <span class="hlt">noise</span> has been evaluated by the time-averaged A-weighted <span class="hlt">level</span> in most countries. Therefore, in the present situation, the railway bonus is not <span class="hlt">acceptable</span> for railway vehicles with diesel-electric engines.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25234891','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25234891"><span>Binaural detection with narrowband and wideband reproducible <span class="hlt">noise</span> maskers. IV. Models using interaural time, <span class="hlt">level</span>, and envelope differences.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mao, Junwen; Carney, Laurel H</p> <p>2014-02-01</p> <p>The addition of out-of-phase tones to in-phase <span class="hlt">noises</span> results in dynamic interaural <span class="hlt">level</span> difference (ILD) and interaural time difference (ITD) cues for the dichotic tone-in-<span class="hlt">noise</span> detection task. Several models have been used to predict listeners' detection performance based on ILD, ITD, or different combinations of the two cues. The models can be tested using detection performance from an ensemble of reproducible-<span class="hlt">noise</span> maskers. Previous models cannot predict listeners' detection performance for reproducible-<span class="hlt">noise</span> maskers without fitting the data. Here, two models were tested for narrowband and wideband reproducible-<span class="hlt">noise</span> experiments. One model was a linear combination of ILD and ITD that included the generally ignored correlation between the two cues. The other model was based on a newly proposed cue, the slope of the interaural envelope difference (SIED). Predictions from both models explained a significant portion of listeners' performance for detection of a 500-Hz tone in wideband <span class="hlt">noise</span>. Predictions based on the SIED approached the predictable variance in the wideband condition. The SIED represented a nonlinear combination of ILD and ITD, with the latter cue dominating. Listeners did not use a common strategy (cue) to detect tones in the narrowband condition and may use different single frequencies or different combinations of frequency channels.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011JNEng...8d6006C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011JNEng...8d6006C"><span>Automatic subthalamic nucleus detection from microelectrode recordings based on <span class="hlt">noise</span> <span class="hlt">level</span> and neuronal activity</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cagnan, Hayriye; Dolan, Kevin; He, Xuan; Fiorella Contarino, Maria; Schuurman, Richard; van den Munckhof, Pepijn; Wadman, Wytse J.; Bour, Lo; Martens, Hubert C. F.</p> <p>2011-08-01</p> <p>Microelectrode recording (MER) along surgical trajectories is commonly applied for refinement of the target location during deep brain stimulation (DBS) surgery. In this study, we utilize automatically detected MER features in order to locate the subthalamic nucleus (STN) employing an unsupervised algorithm. The automated algorithm makes use of background <span class="hlt">noise</span> <span class="hlt">level</span>, compound firing rate and power spectral density along the trajectory and applies a threshold-based method to detect the dorsal and the ventral borders of the STN. Depending on the combination of measures used for detection of the borders, the algorithm allocates confidence <span class="hlt">levels</span> for the annotation made (i.e. high, medium and low). The algorithm has been applied to 258 trajectories obtained from 84 STN DBS implantations. MERs used in this study have not been pre-selected or pre-processed and include all the viable measurements made. Out of 258 trajectories, 239 trajectories were annotated by the surgical team as containing the STN versus 238 trajectories by the automated algorithm. The agreement <span class="hlt">level</span> between the automatic annotations and the surgical annotations is 88%. Taking the surgical annotations as the golden standard, across all trajectories, the algorithm made true positive annotations in 231 trajectories, true negative annotations in 12 trajectories, false positive annotations in 7 trajectories and false negative annotations in 8 trajectories. We conclude that our algorithm is accurate and reliable in automatically identifying the STN and locating the dorsal and ventral borders of the nucleus, and in a near future could be implemented for on-line intra-operative use.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012SPIE.8207E..27C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012SPIE.8207E..27C"><span>The optimal window time to treat <span class="hlt">noise</span>-induced hearing loss (NIHL) with low <span class="hlt">level</span> laser therapy (LLLT)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chang, So-Young; Suh, Myung-Whan; Bahk, Chan Woong; Jung, Jae Yun; Ahn, Jin-Chul; Chung, Phil-Sang; Rhee, Chung-Ku</p> <p>2012-02-01</p> <p>The transcanal LLLT was found to recover <span class="hlt">noise</span> induced hearing loss (NIHL) but the LLLT was performed immediately after the induction of NIHL. The aim of this study was to find an optimal window time to treat and recover a NIHL with LLLT. Bilateral ears of 6SD rats (12ears) were exposed to <span class="hlt">noise</span>. Left ears of the rats were irradiated with a LLLT (830 nm, 594 J/cm2 per day) for 12 days, starting 3 days and 7 days post exposure to <span class="hlt">noise</span>. Right ears were used as control ears. The hearing <span class="hlt">levels</span> were measured at each frequency of 4, 8, 12, 16, and 32 kHz before and after the <span class="hlt">noise</span> exposure and post 12th irradiations. The initial hearing <span class="hlt">levels</span> in all frequencies before and after the <span class="hlt">noise</span> exposure were 26.5, 24.5, 24.0, 24.0 and 24.5 dB SPL and 63.5, 64, 71.5, 73.5 and 67.5 dB SPL in 4, 8, 12, 16 and 32 kHz, respectively in 6 ears. After 12th irradiation, the thresholds of the LLLT treated left ears of the 3-day group recovered significantly compared to those of the untreated right. However, for the 7 day group, the recovery of the LLLT treated left ears was not significantly improved compared to that of the untreated right. The results of this study suggest that the optimal window time to treat NIHL with LLLT was within 3 days from the exposure to <span class="hlt">noise</span> but the hearing failed to recover if the LLLT was started 7 days post exposure to <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007MeScT..18.2131T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007MeScT..18.2131T"><span>Combustion <span class="hlt">noise</span> <span class="hlt">level</span> assessment in direct injection Diesel engines by means of in-cylinder pressure components</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Torregrosa, A. J.; Broatch, A.; Martín, J.; Monelletta, L.</p> <p>2007-07-01</p> <p>The low consumption achievable with Diesel engines and the subsequent reduction of CO2 emissions, together with the new technologies allowing to meet present and future legislation for pollutant emission reduction, make them attractive from an environmental viewpoint. However, current and future Diesel concepts are intrinsically noisy, and thus in the past few years, combustion <span class="hlt">noise</span> was considered as an additional factor in engine development alongside performance, emissions and driveability. Otherwise, due to this negative issue intrinsic to Diesel combustion, end-users could be reluctant to drive Diesel-powered vehicles and their potential for environment preservation could thus be lost or underused. Evaluation procedures are then required, both for <span class="hlt">noise</span> <span class="hlt">level</span> and sound quality, that may be integrated into the global engine development process, avoiding the need to resort to long and expensive acoustic tests. In this paper, such a procedure, based on the <span class="hlt">noise</span> source diagnostic through the definition of suitable components extracted from in-cylinder pressure, is proposed and validated. An innovative decomposition of the in-cylinder pressure signal is used to obtain such components, so that features associated with the excitation inside the cylinder may be properly identified. These combustion components, significant of the rate of heat release in the cylinder and the resonance in the combustion chamber, may be correlated with the overall <span class="hlt">noise</span> <span class="hlt">level</span>. A prediction of the radiated engine <span class="hlt">noise</span> <span class="hlt">level</span> more accurate than that obtained from the classical 'block attenuation' approach is achieved, while combustion process features related to the resulting <span class="hlt">noise</span> <span class="hlt">level</span> can be identified and thus corrective actions may be proposed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19960027050','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19960027050"><span>Baseline acoustic <span class="hlt">levels</span> of the NASA Active <span class="hlt">Noise</span> Control Fan rig</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sutliff, Daniel L.; Heidelberg, Laurence J.; Elliott, David M.; Nallasamy, M.</p> <p>1996-01-01</p> <p>Extensive measurements of the spinning acoustic mode structure in the NASA 48 inch Active <span class="hlt">Noise</span> Control Fan (ANCF) test rig have been taken. A continuously rotating microphone rake system with a least-squares data reduction technique was employed to measure these modes in the inlet and exhaust. Farfield directivity patterns in an anechoic environment were also measured at matched corrected rotor speeds. Several vane counts and spacings were tested over a range of rotor speeds. The Eversman finite element radiation code was run with the measured in-duct modes as input and the computed farfield results were compared to the experimentally measured directivity pattern. The experimental data show that inlet spinning mode measurements can be made very accurately. Exhaust mode measurements may have wake interference, but the least-squares reduction does a good job of rejecting the non-acoustic pressure. The Eversman radiation code accurately extrapolates the farfield <span class="hlt">levels</span> and directivity pattern when all in-duct modes are included.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3125531','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3125531"><span>Nutrient Plasma <span class="hlt">Levels</span> Achieved During Treatment that Reduces <span class="hlt">Noise</span>-Induced Hearing Loss</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Le Prell, C. G.; Dolan, D. F.; Bennett, D. C.; Boxer, P. A.</p> <p>2011-01-01</p> <p>Hearing loss encompasses both temporary and permanent deficits. If temporary threshold shift (TTS) and permanent threshold shift (PTS) share common pathological mechanisms, then agents that reduce PTS should also reduce TTS. Several antioxidant agents have reduced PTS in rodent models; however, reductions in TTS have been inconsistent. This study first determined whether dietary antioxidants (beta-carotene, and vitamins C and E) delivered in combination with magnesium (Mg) reliably increase plasma concentrations of the active agents. Then, additional manipulations tested the hypothesis that these nutrients reduce acute TTS insult in the first 24 hours following loud sound, as well as longer lasting changes in hearing measured up to 7 days post-<span class="hlt">noise</span>. Saline or nutrients were administered to guinea pigs prior to and after <span class="hlt">noise</span> exposure. Sound-evoked electrophysiological responses were measured before <span class="hlt">noise</span>, with tests repeated 1-hour post-<span class="hlt">noise</span>, as well as 1-, 3-, 5-, and 7-days post-<span class="hlt">noise</span>. All subjects showed significant functional recovery; subjects treated with nutrients recovered more rapidly, and had better hearing outcomes at early post-<span class="hlt">noise</span> times as well as the final test time. Thus, this combination of nutrients, which produced significant increases in plasma concentrations of vitamins C and E and Mg, effectively reduced hearing loss at multiple post-<span class="hlt">noise</span> times. These data suggest free radical formation contributes to TTS as well as PTS insults, and suggest a potential opportunity to prevent TTS in human populations. PMID:21708356</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28096427','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28096427"><span>Influence of fatiguing <span class="hlt">noise</span> on auditory evoked responses to stimuli of various <span class="hlt">levels</span> in a beluga whale, Delphinapterus leucas.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Popov, Vladimir V; Sysueva, Evgeniya V; Nechaev, Dmitry I; Rozhnov, Viatcheslav V; Supin, Alexander Ya</p> <p>2017-03-15</p> <p>The negative impact of man-made <span class="hlt">noise</span> on the hearing of odontocetes has attracted considerable recent attention. In the majority of studies, permanent or temporary reductions in sensitivity, known as permanent or temporary threshold shift (PTS or TTS, respectively), have been investigated. In the present study, the effects of a fatiguing sound on the hearing of a beluga whale, Delphinapterus leucas, within a wide range of <span class="hlt">levels</span> of test signals was investigated. The fatiguing <span class="hlt">noise</span> was half-octave band-limited <span class="hlt">noise</span> centered at 32 kHz. Post-exposure effects of this <span class="hlt">noise</span> on the evoked responses to test stimuli (rhythmic pip trains with a 45-kHz center frequency) at various <span class="hlt">levels</span> (from threshold to 60 dB above threshold) were measured. For baseline (pre-exposure) responses, the magnitude-versus-<span class="hlt">level</span> function featured a segment of steep magnitude dependence on <span class="hlt">level</span> (up to 30 dB above threshold) that was followed by a plateau segment that featured little dependence on <span class="hlt">level</span> (30 to 55 dB above threshold). Post-exposure, the function shifted upward along the <span class="hlt">level</span> scale. The shift was 23 dB at the threshold and up to 33 dB at the supra-threshold <span class="hlt">level</span>. Owing to the plateau in the magnitude-versus-<span class="hlt">level</span> function, post-exposure suppression of responses depended on the stimulus <span class="hlt">level</span> such that higher <span class="hlt">levels</span> corresponded to less suppression. The experimental data may be modeled based on the compressive non-linearity of the cochlea. According to the model, post-exposure responses of the cochlea to high-<span class="hlt">level</span> stimuli are minimally suppressed compared with the pre-exposure responses, despite a substantially increased threshold.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26333123','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26333123"><span><span class="hlt">Noise</span> Stress-Induced Changes in mRNA <span class="hlt">Levels</span> of Corticotropin-Releasing Hormone Family Molecules and Glucocorticoid Receptors in the Rat Brain.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Eraslan, E; Akyazi, İ; Ergül-Ekiz, E; Matur, E</p> <p>2015-01-01</p> <p><span class="hlt">Noise</span> is a widespread stress resource that may lead to detrimental effects on the health. However, the molecular basis of the stress response caused by <span class="hlt">noise</span> remains elusive. We have studied the effects of acute and chronic <span class="hlt">noise</span> stress on stress-related molecules in the hypothalamus and hippocampus and also corticosterone responses. Sprague Dawley rats were randomized into control, acute and chronic <span class="hlt">noise</span> stress groups. While the chronic <span class="hlt">noise</span> stress group animals were exposed to 100 dB white <span class="hlt">noise</span> for 4 h/a day during 30 days, the acute <span class="hlt">noise</span> stress group of animals was exposed to the same <span class="hlt">level</span> of stress once for 4 h. The expression profiles of corticotropin releasing hormone (CRH), CRH1, CRH2 receptors and glucocorticoid receptor (GR) mRNAs were analysed by RT-PCR. Chronic <span class="hlt">noise</span> stress upregulated CRH mRNA <span class="hlt">levels</span> in the hypothalamus. Both acute and chronic <span class="hlt">noise</span> increased CRH-R1 mRNA in the hypothalamus but decreased it in the hippocampus. GR mRNA <span class="hlt">levels</span> were decreased by chronic <span class="hlt">noise</span> stress in the hippocampus. The present results suggest that while corticosterone responses have habituated to continuous <span class="hlt">noise</span> stress, the involvement of CRH family molecules and glucocorticoid receptors in the <span class="hlt">noise</span> stress responses are different and structure specific.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19870001601&hterms=white+noise&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dwhite%2Bnoise','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19870001601&hterms=white+noise&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dwhite%2Bnoise"><span>Choosing channel quantization <span class="hlt">levels</span> and viterbi decoding for space diversity reception over the additive white Guassian <span class="hlt">noise</span> channel</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Kalson, S.</p> <p>1986-01-01</p> <p>Previous work in the area of choosing channel quantization <span class="hlt">levels</span> for a additive white Gaussian <span class="hlt">noise</span> channel composed of one receiver-demodulator is reviewed, and how this applies to the Deep Space Network composed of several receiver-demodulators (space diversity reception) is shown. Viterbi decoding for the resulting quantized channel is discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20550251','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20550251"><span>An investigation of community <span class="hlt">noise</span> in high-rise residential environments.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Alam, Sheikh Mahbub; Eang, Lee Siew; Tan, Alan; Tiong, Tan Sze</p> <p>2010-06-01</p> <p>High-rise dwellers in Singapore are often subjected to several community <span class="hlt">noise</span> sources in close proximity. These include food center, children playground, soccer playground, basketball playground, waste disposal truck, etc. A scientific and reliable approach is required for evaluation of the community <span class="hlt">noise</span> and its impact on high-rise dwellers. A comprehensive <span class="hlt">noise</span> survey by a cluster sampling technique, conducted among 522 households in five residential towns in Singapore, showed that community <span class="hlt">noise</span> was one of the prime sources of <span class="hlt">noise</span> in a high-rise residential environment. From a subjective <span class="hlt">noise</span> survey, undertaken concurrent with objective <span class="hlt">noise</span> measurements, a mean outdoor <span class="hlt">noise</span> <span class="hlt">level</span> of 59 dBA was established as an <span class="hlt">acceptable</span> <span class="hlt">noise</span> <span class="hlt">level</span> in the indoor environment. To investigate the <span class="hlt">level</span> of <span class="hlt">noise</span> exposure from different community <span class="hlt">noise</span> sources, software modeling and simulations were carried out. The predicted results were validated with field measured data at five 16 story residential buildings. Analysis of <span class="hlt">noise</span> exposure data showed that except for waste disposal truck, <span class="hlt">noise</span> exposure due to other community <span class="hlt">noise</span> sources (building distance of 15 m) were within the established <span class="hlt">acceptable</span> <span class="hlt">noise</span> <span class="hlt">level</span>. A factor analysis of the survey data identified the key factors related to the disturbance due to community <span class="hlt">noise</span> sources.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PhRvA..88c3406L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PhRvA..88c3406L"><span>Fast and robust population transfer in two-<span class="hlt">level</span> quantum systems with dephasing <span class="hlt">noise</span> and/or systematic frequency errors</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lu, Xiao-Jing; Chen, Xi; Ruschhaupt, A.; Alonso, D.; Guérin, S.; Muga, J. G.</p> <p>2013-09-01</p> <p>We design, by invariant-based inverse engineering, driving fields that invert the population of a two-<span class="hlt">level</span> atom in a given time, robustly with respect to dephasing <span class="hlt">noise</span> and/or systematic frequency shifts. Without imposing constraints, optimal protocols are insensitive to the perturbations but need an infinite energy. For a constrained value of the Rabi frequency, a flat π pulse is the least sensitive protocol to phase <span class="hlt">noise</span> but not to systematic frequency shifts, for which we describe and optimize a family of protocols.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA109430','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA109430"><span>Potential for Interaction of Low-<span class="hlt">Level</span> Impulse and Continuous <span class="hlt">Noise</span></span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>1981-03-01</p> <p>not include provisions for evaluating the combined effects of impulse and eontinuous <span class="hlt">noise</span>, Moreover, research on animal models (chinchilla) has shown...hearing function from this animal. Also, we probably have a better understanding of how <span class="hlt">noise</span> affects the chinchilla than any odher animal model . The...8217._____ -- . ....... _- . . . TABLE 6 (cont’d) THE MEAN AND THE GROUP MEDIAN THRESHOLD SHIFTS MEASURED DURING THE 8TH EXPOSURE WEEK GpOUp I Animl No. kHa 703 706</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19904306','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19904306"><span>Long-term stabilization of a heterodyne metrology interferometer down to a <span class="hlt">noise</span> <span class="hlt">level</span> of 20 pm over an hour.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Niwa, Yoshito; Arai, Koji; Ueda, Akitoshi; Sakagami, Masaaki; Gouda, Naoteru; Kobayashi, Yukiyasu; Yamada, Yoshiyuki; Yano, Taihei</p> <p>2009-11-10</p> <p>A heterodyne metrology interferometer was stabilized down to a <span class="hlt">noise</span> <span class="hlt">level</span> of 20 picometers (pm) as a root-mean-square (RMS) value integrated between 0.3 mHz and 1 Hz. This <span class="hlt">noise</span> <span class="hlt">level</span> was achieved by employing active and passive interferometer stabilization techniques. The heterodyne interferometer was built on a 50 mm square ultralow expansion glass plate in order to reduce an optical path length change caused by temperature variation. An optical configuration of the interferometer is a Mach-Zehnder interferometer with a design as symmetric as possible so that a detection signal can be insensitive to homogeneous thermal expansion of the glass plate. The heterodyne frequency is actively controlled in order to suppress residual <span class="hlt">noises</span> caused by optical path length changes outside of the glass plate as well as phase fluctuations of the heterodyne frequency source. Our stabilization scheme is considered useful in achieving the 20 pm <span class="hlt">noise</span> <span class="hlt">level</span> without a stable heterodyne frequency source, as well as temperature stabilization around a whole apparatus. This interferometer can be used in precise metrology applications, such as characterization of deformation for satellite optical components against thermal exposure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/22036419','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/22036419"><span>Long-term stabilization of a heterodyne metrology interferometer down to a <span class="hlt">noise</span> <span class="hlt">level</span> of 20 pm over an hour</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Niwa, Yoshito; Arai, Koji; Ueda, Akitoshi; Sakagami, Masaaki; Gouda, Naoteru; Kobayashi, Yukiyasu; Yamada, Yoshiyuki; Yano, Taihei</p> <p>2009-11-10</p> <p>A heterodyne metrology interferometer was stabilized down to a <span class="hlt">noise</span> <span class="hlt">level</span> of 20 picometers (pm) as a root-mean-square (RMS) value integrated between 0.3 mHz and 1 Hz. This <span class="hlt">noise</span> <span class="hlt">level</span> was achieved by employing active and passive interferometer stabilization techniques. The heterodyne interferometer was built on a 50 mm square ultralow expansion glass plate in order to reduce an optical path length change caused by temperature variation. An optical configuration of the interferometer is a Mach-Zehnder interferometer with a design as symmetric as possible so that a detection signal can be insensitive to homogeneous thermal expansion of the glass plate. The heterodyne frequency is actively controlled in order to suppress residual <span class="hlt">noises</span> caused by optical path length changes outside of the glass plate as well as phase fluctuations of the heterodyne frequency source. Our stabilization scheme is considered useful in achieving the 20 pm <span class="hlt">noise</span> <span class="hlt">level</span> without a stable heterodyne frequency source, as well as temperature stabilization around a whole apparatus. This interferometer can be used in precise metrology applications, such as characterization of deformation for satellite optical components against thermal exposure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3438459','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3438459"><span>Auditory map reorganization and pitch discrimination in adult rats chronically exposed to low-<span class="hlt">level</span> ambient <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zheng, Weimin</p> <p>2012-01-01</p> <p>Behavioral adaption to a changing environment is critical for an animal's survival. How well the brain can modify its functional properties based on experience essentially defines the limits of behavioral adaptation. In adult animals the extent to which experience shapes brain function has not been fully explored. Moreover, the perceptual consequences of experience-induced changes in the brains of adults remain unknown. Here we show that the tonotopic map in the primary auditory cortex of adult rats living with low-<span class="hlt">level</span> ambient <span class="hlt">noise</span> underwent a dramatic reorganization. Behaviorally, chronic <span class="hlt">noise</span>-exposure impaired fine, but not coarse pitch discrimination. When tested in a noisy environment, the <span class="hlt">noise</span>-exposed rats performed as well as in a quiet environment whereas the control rats performed poorly. This suggests that <span class="hlt">noise</span>-exposed animals had adapted to living in a noisy environment. Behavioral pattern analyses revealed that stress or distraction engendered by the noisy background could not account for the poor performance of the control rats in a noisy environment. A reorganized auditory map may therefore have served as the neural substrate for the consistent performance of the <span class="hlt">noise</span>-exposed rats in a noisy environment. PMID:22973201</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016EGUGA..1813783L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016EGUGA..1813783L"><span>Climatic and anthropogenic stress on water <span class="hlt">levels</span>: basin-scale observations with seismic <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lecocq, Thomas; Pedersen, Helle; Brenguier, Florent; Stammler, Klaus</p> <p>2016-04-01</p> <p>Monitoring changes in shear wave velocities within the crust have become possible through recently developed techniques based on seismic <span class="hlt">noise</span> analysis. In the present work we address the challenge of using these techniques for environmental monitoring at upper crustal <span class="hlt">level</span>. Our work is based on data from the broadband Gräfenberg array (Germany) which was installed in 1976 and for which the continuous data acquired has been preserved until today. Using state of the art pre-processing and cross-correlation techniques (MSNoise), we computed daily cross-correlation functions (CCF) between 4 stations (6 pairs) of the Gräfenberg array over the period 1977-2007. The daily CCFs are then stacked to form an average CCF per month. Instead of doing classic "one versus reference" comparisons, the monthly CCFs are compared pairwise using Moving Window Cross-Spectral analysis (MWCS). In total, 387 720 MWCS have been computed between 20 s and 80 s lapse time to obtain relative velocity changes (dv/v). All dv/v are then inverted using a Bayesian weighted least square procedure. Depending on the smoothing weight used during the inversion, seasonal to long term trends can be evidenced. The results show clear and stable trends in the data. We present possible causes explaining these trends and abrupt changes of dv/v by showing modelled (GLDAS) and observed climatic data together with anthropogenic observables. A combination of climatic (warmer surface temperatures, less rainfall) and anthropogenic (more population, more irrigated land) factors are the most probable causes of the progressive relative increase of seismic velocities under the Gräfenberg array. We interpret these results as a progressive depletion of the water resources in the large karstified Malm reservoir (Late Jurassic) below the array.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5327586','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5327586"><span>A Trainable Hearing Aid Algorithm Reflecting Individual Preferences for Degree of <span class="hlt">Noise</span>-Suppression, Input Sound <span class="hlt">Level</span>, and Listening Situation</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Yoon, Sung Hoon; Nam, Kyoung Won; Yook, Sunhyun; Cho, Baek Hwan; Jang, Dong Pyo; Hong, Sung Hwa; Kim, In Young</p> <p>2017-01-01</p> <p>Objectives In an effort to improve hearing aid users’ satisfaction, recent studies on trainable hearing aids have attempted to implement one or two environmental factors into training. However, it would be more beneficial to train the device based on the owner’s personal preferences in a more expanded environmental acoustic conditions. Our study aimed at developing a trainable hearing aid algorithm that can reflect the user’s individual preferences in a more extensive environmental acoustic conditions (ambient sound <span class="hlt">level</span>, listening situation, and degree of <span class="hlt">noise</span> suppression) and evaluated the perceptual benefit of the proposed algorithm. Methods Ten normal hearing subjects participated in this study. Each subjects trained the algorithm to their personal preference and the trained data was used to record test sounds in three different settings to be utilized to evaluate the perceptual benefit of the proposed algorithm by performing the Comparison Mean Opinion Score test. Results Statistical analysis revealed that of the 10 subjects, four showed significant differences in amplification constant settings between the <span class="hlt">noise</span>-only and speech-in-<span class="hlt">noise</span> situation (P<0.05) and one subject also showed significant difference between the speech-only and speech-in-<span class="hlt">noise</span> situation (P<0.05). Additionally, every subject preferred different β settings for beamforming in all different input sound <span class="hlt">levels</span>. Conclusion The positive findings from this study suggested that the proposed algorithm has potential to improve hearing aid users’ personal satisfaction under various ambient situations. PMID:27507270</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=noise+AND+environment&pg=2&id=EJ721822','ERIC'); return false;" href="http://eric.ed.gov/?q=noise+AND+environment&pg=2&id=EJ721822"><span><span class="hlt">Noise</span> <span class="hlt">Levels</span> in Hong Kong Primary Schools: Implications for Classroom Listening</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Choi, Ching Yee; McPherson, Bradley</p> <p>2005-01-01</p> <p>Many researchers have stressed that the acoustic environment is crucial to the speech perception, academic performance, attention, and participation of students in classrooms. Classrooms in highly urbanised locations are especially vulnerable to <span class="hlt">noise</span>, a major influence on the acoustic environment. The purpose of this investigation was to…</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA205758','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA205758"><span>A Standard Definition for Wind-Generated, Low-Frequency Ambient <span class="hlt">Noise</span> Source <span class="hlt">Levels</span></span></a></p> <p><a target="_blank" href="https://publicaccess.dtic.mil/psm/api/service/search/search">DTIC Science & Technology</a></p> <p></p> <p>1989-02-09</p> <p>FUNDING NUMBERS PROGR.AM PROJECT ITASK IWORK UNIT ELEMENT 14O. NO. NO. IACCESSION NO. I I ritLE (include Security Caiafaon) I7Ol A STANDARD DEFINITION...use of a specific propagation code (PE, RAYTRACE, ASTRAL , NORMAL MODE, etc). The specification of <span class="hlt">noise</span> intensity per unit area with respect to/ /P</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016OEng....6...77S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016OEng....6...77S"><span><span class="hlt">Noise</span> <span class="hlt">level</span> arrangement in determined zones of homogenous development of green areas on the example of the spa park in Inowrocław</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sztubecka, Małgorzata; Skiba, Marta</p> <p>2016-11-01</p> <p><span class="hlt">Noise</span> measurements are usually carried out in developed areas as well as in the surroundings of traffic routes providing basis for actions in order to limit its influence on the neighboring areas. <span class="hlt">Noise</span> measurements in park areas are rare due to belief that these areas are silent zones. Such attitude cannot be justified. This article aims to the assessment of <span class="hlt">noise</span> appearing in determined subzones of the spa park in Inowrocław. From the research carried out it can be noticed that traffic <span class="hlt">noise</span> does not have any important meaning for the acoustic climate of the park. It is the people who stay there who generate more <span class="hlt">noise</span>. Comparative analysis proves the appearance and penetration of <span class="hlt">noise</span> from the zones with greater <span class="hlt">level</span> of <span class="hlt">noise</span> to the ones with lower amount.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2894914','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2894914"><span>Your attention please: increasing ambient <span class="hlt">noise</span> <span class="hlt">levels</span> elicits a change in communication behaviour in humpback whales (Megaptera novaeangliae)</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Dunlop, Rebecca A.; Cato, Douglas H.; Noad, Michael J.</p> <p>2010-01-01</p> <p>High background <span class="hlt">noise</span> is an important obstacle in successful signal detection and perception of an intended acoustic signal. To overcome this problem, many animals modify their acoustic signal by increasing the repetition rate, duration, amplitude or frequency range of the signal. An alternative method to ensure successful signal reception, yet to be tested in animals, involves the use of two different types of signal, where one signal type may enhance the other in periods of high background <span class="hlt">noise</span>. Humpback whale communication signals comprise two different types: vocal signals, and surface-generated signals such as ‘breaching’ or ‘pectoral slapping’. We found that humpback whales gradually switched from primarily vocal to primarily surface-generated communication in increasing wind speeds and background <span class="hlt">noise</span> <span class="hlt">levels</span>, though kept both signal types in their repertoire. Vocal signals have the advantage of having higher information content but may have the disadvantage of loosing this information in a noisy environment. Surface-generated sounds have energy distributed over a greater frequency range and may be less likely to become confused in periods of high wind-generated <span class="hlt">noise</span> but have less information content when compared with vocal sounds. Therefore, surface-generated sounds may improve detection or enhance the perception of vocal signals in a noisy environment. PMID:20392731</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/6157384','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/6157384"><span>Effectiveness of predictive computer programs in the design of <span class="hlt">noise</span> barriers. A before and after approach. Part 2-B: Supplement. The <span class="hlt">noise</span> <span class="hlt">level</span> data. Final Report, June 1975-June 1981</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Haviland, J.K.; Noble, D.F.</p> <p>1981-06-01</p> <p>To evaluate the efficacy of the predictive computer programs used to design the barriers, <span class="hlt">noise</span> measurements were taken before and after construction of an Earth berm and plywood wall alongside I-495 in Northern Virginia. Despite intrusive <span class="hlt">noise</span> periodically overriding the traffic <span class="hlt">noise</span> from I-495, the latter clearly dominated the neighborhood <span class="hlt">noise</span> environment. Direct correlations made between variations in L10 <span class="hlt">levels</span> and truck traffic and between L50 and L90 <span class="hlt">levels</span> and automobile traffic seem to support the generalization that the L10 <span class="hlt">levels</span> are controlled by trucks and the L90 <span class="hlt">levels</span> are controlled by automobiles. See Part II-A for a description of the study and the discussion of the results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013GeoJI.194..719B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013GeoJI.194..719B"><span>Characterizing and minimizing the effects of <span class="hlt">noise</span> in tide gauge time series: relative and geocentric sea <span class="hlt">level</span> rise around Australia</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Burgette, Reed J.; Watson, Christopher S.; Church, John A.; White, Neil J.; Tregoning, Paul; Coleman, Richard</p> <p>2013-08-01</p> <p>We quantify the rate of sea <span class="hlt">level</span> rise around the Australian continent from an analysis of tide gauge and Global Positioning System (GPS) data sets. To estimate the underlying linear rates of sea <span class="hlt">level</span> change in the presence of significant interannual and decadal variability (treated here as <span class="hlt">noise</span>), we adopt and extend a novel network adjustment approach. We simultaneously estimate time-correlated <span class="hlt">noise</span> as well as linear model parameters and realistic uncertainties from sea <span class="hlt">level</span> time series at individual gauges, as well as from time-series differences computed between pairs of gauges. The <span class="hlt">noise</span> content at individual gauges is consistent with a combination of white and time-correlated <span class="hlt">noise</span>. We find that the <span class="hlt">noise</span> in time series from the western coast of Australia is best described by a first-order Gauss-Markov model, whereas east coast stations generally exhibit lower <span class="hlt">levels</span> of time-correlated <span class="hlt">noise</span> that is better described by a power-law process. These findings suggest several decades of monthly tide gauge data are needed to reduce rate uncertainties to <0.5 mm yr-1 for undifferenced single site time series with typical <span class="hlt">noise</span> characteristics. Our subsequent adjustment strategy exploits the more precise differential rates estimated from differenced time series from pairs of tide gauges to estimate rates among the network of 43 tide gauges that passed a stability analysis. We estimate relative sea <span class="hlt">level</span> rates over three temporal windows (1900-2011, 1966-2011 and 1993-2011), accounting for covariance between time series. The resultant adjustment reduces the rate uncertainty across individual gauges, and partially mitigates the need for century-scale time series at all sites in the network. Our adjustment reveals a spatially coherent pattern of sea <span class="hlt">level</span> rise around the coastline, with the highest rates in northern Australia. Over the time periods beginning in 1900, 1966 and 1993, we find weighted average rates of sea <span class="hlt">level</span> rise of 1.4 ± 0.6, 1.7 ± 0.6 and 4.6 ± 0</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27571783','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27571783"><span>Effect of hearing aid release time and presentation <span class="hlt">level</span> on speech perception in <span class="hlt">noise</span> in elderly individuals with hearing loss.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pottackal Mathai, Jijo; Mohammed, Hasheem</p> <p>2017-02-01</p> <p>To investigate the effect of compression time settings and presentation <span class="hlt">levels</span> on speech perception in <span class="hlt">noise</span> for elderly individuals with hearing loss. To compare aided speech perception performance in these individuals with age-matched normal hearing subjects. Twenty (normal hearing) participants within the age range of 60-68 years and 20 (mild-to-moderate sensorineural hearing loss) in the age range of 60-70 years were randomly recruited for the study. In the former group, SNR-50 was determined using phonetically balanced sentences that were mixed with speech-shaped <span class="hlt">noise</span> presented at the most comfortable <span class="hlt">level</span>. In the SNHL group, aided SNR-50 was determined at three different presentation <span class="hlt">levels</span> (40, 60, and 80 dB HL) after fitting binaural hearing aids that had different compression time settings (fast and slow). In the SNHL group, slow compression time settings showed significantly better SNR-50 compared to fast release time. In addition, the mean of SNR-50 in the SNHL group was comparable to normal hearing participants while using a slow release time. A hearing aid with slow compression time settings led to significantly better speech perception in <span class="hlt">noise</span>, compared to that of a hearing aid that had fast compression time settings.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4901346','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4901346"><span>Attention enhances stimulus representations in macaque visual cortex without affecting their signal-to-<span class="hlt">noise</span> <span class="hlt">level</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Daliri, Mohammad Reza; Kozyrev, Vladislav; Treue, Stefan</p> <p>2016-01-01</p> <p>The magnitude of the attentional modulation of neuronal responses in visual cortex varies with stimulus contrast. Whether the strength of these attentional influences is similarly dependent on other stimulus properties is unknown. Here we report the effect of spatial attention on responses in the medial-temporal area (MT) of macaque visual cortex to moving random dots pattern of various motion coherences, i.e. signal-to-<span class="hlt">noise</span> ratios. Our data show that allocating spatial attention causes a gain change in MT neurons. The magnitude of this attentional modulation is independent of the attended stimulus’ motion coherence, creating a multiplicative scaling of the neuron’s coherence-response function. This is consistent with the characteristics of gain models of attentional modulation and suggests that attention strengthens the neuronal representation of behaviorally relevant visual stimuli relative to unattended stimuli, but without affecting their signal-to-<span class="hlt">noise</span> ratios. PMID:27283275</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1993eaug.rept.....P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993eaug.rept.....P"><span>An experimental assessment of the use of ground-<span class="hlt">level</span> microphones to measure the fly-over <span class="hlt">noise</span> of jet-engined aircraft</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Payne, R. C.</p> <p>1993-01-01</p> <p>During aircraft flight trials to measure the <span class="hlt">noise</span> <span class="hlt">levels</span> of six different military jet aircraft types in low altitude high speed operations, <span class="hlt">noise</span> measurements were performed using microphones at ground <span class="hlt">level</span> and at a height of 1.2 m. The program provided reliable data on the difference between sound pressure <span class="hlt">levels</span> from the two microphone arrangements, for sound incident over a range of angles, from 0 deg (aircraft overhead) to approximately 80 deg. Substantial differences from ground <span class="hlt">level</span> to 1.2 m were observed in measurements of maximum perceived <span class="hlt">noise</span> <span class="hlt">level</span>, effective perceived <span class="hlt">noise</span> <span class="hlt">level</span> and maximum A-weighted sound pressure <span class="hlt">level</span>. For sound waves incident to the ground at angles less than approximately 60 deg from vertical, these differences were found to be independent of angle of incidence for all the six aircraft and all flight procedures. Within this range of sound incidence angles the ground plane arrangement produced data that closely approximated pressure doubled values. The conventional 1.2 m high microphone gave rise to <span class="hlt">noise</span> <span class="hlt">levels</span> approximately 4 dB lower. For sound incident at angles greater than 60 deg from vertical, the difference between <span class="hlt">noise</span> <span class="hlt">levels</span> measured using the two microphone configurations was found to depend on angle of incidence, reducing to zero at approximately 75 deg. When <span class="hlt">noise</span> measurements are made using the ground plane arrangement, the effects of meteorological conditions must be considered in relation to sound incident at angles greater than approximately 60 deg.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19790023883','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19790023883"><span>Study of design constraints on helicopter <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sternfeld, H., Jr.; Wiedersum, C. W.</p> <p>1979-01-01</p> <p>A means of estimating the <span class="hlt">noise</span> generated by a helicopter main rotor using information which is generally available during the preliminary design phase of aircraft development is presented. The method utilizes design charts and tables which do not require an understanding of acoustical theory or computational procedures in order to predict the perceived <span class="hlt">noise</span> <span class="hlt">level</span>, a weighted sound pressure <span class="hlt">level</span>, or C weighted sound pressure <span class="hlt">level</span> of a single hovering rotor. A method for estimating the effective perceived <span class="hlt">noise</span> <span class="hlt">level</span> in forward flight is also included. In order to give the designer an assessment of the relative rotor performance, which may be traded off against <span class="hlt">noise</span>, an additional chart for estimating the percent of available rotor thrust which must be expended in lifting the rotor and drive system, is included as well as approach for comparing the subjective <span class="hlt">acceptability</span> of various rotors once the absolute sound pressure <span class="hlt">levels</span> are predicted.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/8458743','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/8458743"><span>The intensitive DL of tones: dependence of signal/masker ratio on tone <span class="hlt">level</span> and on spectrum of added <span class="hlt">noise</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Greenwood, D D</p> <p>1993-02-01</p> <p>In Greenwood [J. Acoust. Soc. Am. 33, 484-502 (1961a)] the ratio of masked signal threshold to masker <span class="hlt">level</span> (S/M) decreased about 4 dB at a masker <span class="hlt">level</span> of about 50 dB SL, the 'transition' <span class="hlt">level</span>, when <span class="hlt">noise</span> bands were subcritical but not when supercritical. Schlauch et al. [J. Acoust. Soc. Am. 71, S73 (1982)] report a related result. A pilot study [Greenwood, Harvard Psychoacoustic Lab. Status Report 37, 8-9 (1961)] in which pure tones masked identical tones in-phase showed a larger change in S/M. Detailed tone-tone growth-of-masking curves from over a dozen subjects in 1967-69, and in 1960, are reported here. A transition in slope, of variable abruptness, often begins to occur at about 50 dB SL, dropping S/M ratio by 6 to 8 dB or more [Rabinowitz et al., J. Acoust. Soc. Am. 35, 1053 (1976)]; the curves sometimes possess two segments, sometimes are simply convex. All have overall slopes less than 1.0, known also as the 'near miss'. Consistent with other results [Zwicker, Acustica 6, 365-396 (1956); Viemeister, J. Acoust. Soc. Am. 51, 1265-1296 (1972); Moore and Raab, J. Acoust. Soc. Am. 55, 1049-1060 (1974)], addition of low-<span class="hlt">level</span> wide-band and high-pass <span class="hlt">noise</span> was found to counteract the change in S/M, i.e., to raise the high-<span class="hlt">level</span> section of the growth-of-masking curve. However, the ability of narrow 'band-pass' <span class="hlt">noise</span> to exert this effect was greatest when added at a frequency ratio (band/masking-tone) of 1.3 to 1.5, which seems more closely to link the effects of added <span class="hlt">noise</span> to the effects of increasing a masking band from sub- to supercritical width (above). Interpretation of the decrease in DL with <span class="hlt">level</span> begins by noting that the 'transition' <span class="hlt">level</span> correlates approximately with the <span class="hlt">level</span> at which a primary unit population excited by a given pure tone begins rapidly to expand basally. Underlying this, the basalward shift of a tone's displacement envelope peak accelerates at about the same <span class="hlt">level</span> [Rhode, J. Acoust. Soc. Am. 49, 1218-1231 (1971); Sellick et al., J</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24180775','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24180775"><span>Aircraft <span class="hlt">noise</span>-induced awakenings are more reasonably predicted from relative than from absolute sound exposure <span class="hlt">levels</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Fidell, Sanford; Tabachnick, Barbara; Mestre, Vincent; Fidell, Linda</p> <p>2013-11-01</p> <p>Assessment of aircraft <span class="hlt">noise</span>-induced sleep disturbance is problematic for several reasons. Current assessment methods are based on sparse evidence and limited understandings; predictions of awakening prevalence rates based on indoor absolute sound exposure <span class="hlt">levels</span> (SELs) fail to account for appreciable amounts of variance in dosage-response relationships and are not freely generalizable from airport to airport; and predicted awakening rates do not differ significantly from zero over a wide range of SELs. Even in conjunction with additional predictors, such as time of night and assumed individual differences in "sensitivity to awakening," nominally SEL-based predictions of awakening rates remain of limited utility and are easily misapplied and misinterpreted. Probabilities of awakening are more closely related to SELs scaled in units of standard deviates of local distributions of aircraft SELs, than to absolute sound <span class="hlt">levels</span>. Self-selection of residential populations for tolerance of nighttime <span class="hlt">noise</span> and habituation to airport <span class="hlt">noise</span> environments offer more parsimonious and useful explanations for differences in awakening rates at disparate airports than assumed individual differences in sensitivity to awakening.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950011639','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950011639"><span>Background <span class="hlt">noise</span> <span class="hlt">levels</span> measured in the NASA Lewis 9- by 15-foot low-speed wind tunnel</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Woodward, Richard P.; Dittmar, James H.; Hall, David G.; Kee-Bowling, Bonnie</p> <p>1994-01-01</p> <p>The acoustic capability of the NASA Lewis 9 by 15 Foot Low Speed Wind Tunnel has been significantly improved by reducing the background <span class="hlt">noise</span> <span class="hlt">levels</span> measured by in-flow microphones. This was accomplished by incorporating streamlined microphone holders having a profile developed by researchers at the NASA Ames Research Center. These new holders were fabricated for fixed mounting on the tunnel wall and for an axially traversing microphone probe which was mounted to the tunnel floor. Measured in-flow <span class="hlt">noise</span> <span class="hlt">levels</span> in the tunnel test section were reduced by about 10 dB with the new microphone holders compared with those measured with the older, less refined microphone holders. Wake interference patterns between fixed wall microphones were measured and resulted in preferred placement patterns for these microphones to minimize these effects. Acoustic data from a model turbofan operating in the tunnel test section showed that results for the fixed and translating microphones were equivalent for common azimuthal angles, suggesting that the translating microphone probe, with its significantly greater angular resolution, is preferred for sideline <span class="hlt">noise</span> measurements. Fixed microphones can provide a local check on the traversing microphone data quality, and record acoustic performance at other azimuthal angles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4844473','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4844473"><span>The Effect of Exposure to High <span class="hlt">Noise</span> <span class="hlt">Levels</span> on the Performance and Rate of Error in Manual Activities</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Khajenasiri, Farahnaz; Zamanian, Alireza; Zamanian, Zahra</p> <p>2016-01-01</p> <p>Introduction Sound is among the significant environmental factors for people’s health, and it has an important role in both physical and psychological injuries, and it also affects individuals’ performance and productivity. The aim of this study was to determine the effect of exposure to high <span class="hlt">noise</span> <span class="hlt">levels</span> on the performance and rate of error in manual activities. Methods This was an interventional study conducted on 50 students at Shiraz University of Medical Sciences (25 males and 25 females) in which each person was considered as its own control to assess the effect of <span class="hlt">noise</span> on her or his performance at the sound <span class="hlt">levels</span> of 70, 90, and 110 dB by using two factors of physical features and the creation of different conditions of sound source as well as applying the Two-Arm coordination Test. The data were analyzed using SPSS version 16. Repeated measurements were used to compare the length of performance as well as the errors measured in the test. Results Based on the results, we found a direct and significant association between the <span class="hlt">levels</span> of sound and the length of performance. Moreover, the participant’s performance was significantly different for different sound <span class="hlt">levels</span> (at 110 dB as opposed to 70 and 90 dB, p < 0.05 and p < 0.001, respectively). Conclusion This study found that a sound <span class="hlt">level</span> of 110 dB had an important effect on the individuals’ performances, i.e., the performances were decreased. PMID:27123216</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22112521','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22112521"><span>Quality and consumer <span class="hlt">acceptability</span> of salt and phosphate enhanced goat loin from goats fed varying <span class="hlt">levels</span> of pine bark.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Leick, C M; Broadway, P R; Solaiman, S; Behrends, J M</p> <p>2012-03-01</p> <p>Goat loins (n=22) were evaluated to test effects of 0, 15, and 30% dietary pine bark (PB) and salt, water, and phosphate enhancement on shelf-life, shear force (WBSF) and consumer <span class="hlt">acceptability</span>. No interactions existed between PB and enhancement. Dietary PB did not affect objective color, but enhancement increased a* and b* values (P<0.05). Thiobarbituric acid reactive substances (TBARS) increased from d 1 to d 5 of storage (P<0.0001), but were not affected by PB or enhancement. The WBSF for 30% PB was less than that of 0% PB (P=0.0199), and enhancement decreased WBSF (P=0.0010). Texture, flavor, and overall <span class="hlt">acceptability</span> were greater (P<0.05) for 15 and 30% PB compared to 0% PB. Enhanced loin samples had greater appearance, aroma, texture, flavor, and overall <span class="hlt">acceptability</span> scores (P<0.05). Results indicated that enhancement improved tenderness and consumer <span class="hlt">acceptability</span> of goat loin, and PB had minimal impact on goat loin quality.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=g&pg=2&id=EJ1123732','ERIC'); return false;" href="http://eric.ed.gov/?q=g&pg=2&id=EJ1123732"><span>Feasibility and <span class="hlt">Acceptability</span> of Classroom-Based Interventions for Students with Emotional/Behavioral Challenges at the High School <span class="hlt">Level</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>State, Talida M.; Harrison, Judith R.; Kern, Lee; Lewis, Timothy J.</p> <p>2017-01-01</p> <p>Little is known about the feasibility and <span class="hlt">acceptability</span> of interventions designed to address the needs of high school students with emotional and behavioral challenges and adopted by their teachers. In this study, 336 general and special education teachers rated classwide interventions (e.g., expectations, routines, positive student-teacher…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22908745','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22908745"><span>[Are intensive care units (ICU) loud? Discrepancies between the perception of professionals and patients and the measurement of real <span class="hlt">noise</span> with sound <span class="hlt">level</span> meter].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Escuté, Mercé Revuelta; Martínez, Javier Rodríguez</p> <p>2012-06-01</p> <p>In the hospital the WHO advises placing the <span class="hlt">noise</span> <span class="hlt">levels</span> between 30 and 45 dB, either rooms or halls, which would be equivalent to the sound <span class="hlt">level</span> allowed in a library. The <span class="hlt">noise</span> <span class="hlt">levels</span> in units both have harmful effects on health and the evolution of the patient, and also on the workers, making it an occupational hazard. The combination of these factors affects both in the patient safety, and in the quality of our care. The aim of this project is to detect the sources of <span class="hlt">noise</span> in an ICU, in order to establish a plan of prevention and reduction of <span class="hlt">noise</span> and trying to get the Guideline Value recommended by WHO. <span class="hlt">Noise</span> pollution is a major health problem.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ997806.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ997806.pdf"><span>A Model for Beliefs, Tool <span class="hlt">Acceptance</span> <span class="hlt">Levels</span> and Web Pedagogical Content Knowledge of Science and Technology Preservice Teachers towards Web Based Instruction</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Horzum, Mehmet Baris; Canan Gungoren, Ozlem</p> <p>2012-01-01</p> <p>One of the applications applied most nowadays is web based instruction (WBI). Although there are many studies on WBI, no study which researched the relations between beliefs for WBI, WBI tools <span class="hlt">acceptance</span> <span class="hlt">levels</span> and web pedagogical content knowledge (WPCK) of science and technology pre-service teachers was found among these studies. The aim of this…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006AGUFM.S11A0190S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006AGUFM.S11A0190S"><span>Data Recovery from Seafloor Borehole Broadband Seismic Observatories in the Northwestern Pacific and Ambient Seismic <span class="hlt">NoiseLevel</span> Changes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shinohara, M.; Araki, E.; Kanazawa, T.; Suyehiro, K.; Yamada, T.; Mochizuki, K.; Nakahigashi, K.</p> <p>2006-12-01</p> <p>In 2000 and 2001, the seafloor borehole seismological observatories WP-1 and WP-2 in the northwestern Pacific were installed. The WP-1 site is in the west Philippine Basin, and the WP-2 observatory is situated on a normal oceanic Mesozoic crust in the northwestern Pacific Basin. The seismic network with 1000-km interval in the western Pacific has been completed by the construction of these stations. Each observatory had two identical broadband seismometers (Guralp, CMG-1T), which were cemented in a igneous rock section. The WP-1 has a water depth of 5710m and all the necessary power was supplied from the Lithium Battery System. For the WP-2 observatory, a water depth is 5566m and the Sea Water Battery (SWB) System mainly supplied the power to the system. We operated only one seismometer for both the observatories to reduce the consuming power of the system. The WP-1 observatory was activated in March 2002 using the ROV KAIKO and long-term observation was started. In June 2006, the new ROV KAIKO-7000II dived to the WP-1 (fourth visit) and recovered the data. At this visit, data recording was discontinued. At present, seismic records of 692-days (Mar. 2002 - Feb, 2004) have been obtained from the WP-1. The WP-2 observatory was activated in October 2000 using the KAIKO. In June 2005, the KAIKO-7000II made fourth visit to the WP-2 and recovered the data. Recording at the WP-2 has been suspended from the fourth ROV visit. In total, 436-days data (Oct. 2000 - Jan. 2001, Aug. 2001 - July 2002) were retrieved. In addition, it was confirmed that the SWB system continued working for the whole observation period by the system monitoring data. The long-term variations of broadband seismic <span class="hlt">noise</span> spectra (3mHz - 10 Hz) in oceanic basins were revealed. The <span class="hlt">noise</span> <span class="hlt">levels</span> (-160 db, re: 1 m**2/s**4/Hz) at periods of greater than 10 s are stable. On the other hand, temporal small variations (maximum fluctuation is 10 dB) of <span class="hlt">noise</span> <span class="hlt">levels</span> (-120 db) for periods around a few seconds are</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AtmEn.155....1E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AtmEn.155....1E"><span>Reduction of air pollution <span class="hlt">levels</span> downwind of a road with an upwind <span class="hlt">noise</span> barrier</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Enayati Ahangar, Faraz; Heist, David; Perry, Steven; Venkatram, Akula</p> <p>2017-04-01</p> <p>We propose a dispersion model to estimate the impact of a solid <span class="hlt">noise</span> barrier upwind of a highway on air pollution concentrations downwind of the road. The model, based on data from wind tunnel experiments conducted by Heist et al. (2009), assumes that the upwind barrier has two main effects: 1) it creates a recirculation zone behind the barrier that sweeps the emissions from the highway back towards the wall, and 2) it enhances vertical dispersion and initial mixing. By combining the upwind barrier model with the mixed wake model for a downwind barrier described in Schulte et al. (2014), we are able to model dispersion of emissions from a highway with <span class="hlt">noise</span> barriers on both sides. The model provides a good description of measurements made in the wind tunnel. The presence of an upwind barrier causes reductions in concentrations relative to those measured downwind of a road with no barriers. The reduction can be as large as that caused by a downwind barrier if the recirculation zone covers the width of the highway. Barriers on both sides of the highway result in larger reductions downwind of the barriers than those caused by a single barrier either upwind or downwind. As expected, barrier effects are small beyond 10 barrier heights downwind of the highway. We also propose a tentative model to estimate on-road concentrations within the recirculation zone induced by the upwind barrier.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19750038290&hterms=noise+pollution&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dnoise%2Bpollution','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19750038290&hterms=noise+pollution&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dnoise%2Bpollution"><span>Judgments of aircraft <span class="hlt">noise</span> in a traffic <span class="hlt">noise</span> background</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Powell, C. A.; Rice, C. G.</p> <p>1975-01-01</p> <p>An investigation was conducted to determine subjective response to aircraft <span class="hlt">noise</span> in different road traffic backgrounds. In addition, two laboratory techniques for presenting the aircraft <span class="hlt">noise</span> with the background <span class="hlt">noise</span> were evaluated. For one technique, the background <span class="hlt">noise</span> was continuous over an entire test session; for the other, the background <span class="hlt">noise</span> <span class="hlt">level</span> was changed with each aircraft <span class="hlt">noise</span> during a session. Subjective response to aircraft <span class="hlt">noise</span> was found to decrease with increasing background <span class="hlt">noise</span> <span class="hlt">level</span>, for a range of typical indoor <span class="hlt">noise</span> <span class="hlt">levels</span>. Subjective response was found to be highly correlated with the <span class="hlt">Noise</span> Pollution <span class="hlt">Level</span> (NPL) measurement scale.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23112603','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23112603"><span>Grey <span class="hlt">level</span> and <span class="hlt">noise</span> evaluation of a Foveon X3 image sensor: a statistical and experimental approach.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Riutort-Mayol, Gabriel; Marqués-Mateu, Angel; Seguí, Ana Elena; Lerma, José Luis</p> <p>2012-01-01</p> <p>Radiometric values on digital imagery are affected by several sources of uncertainty. A practical, comprehensive and flexible procedure to analyze the radiometric values and the uncertainty effects due to the camera sensor system is described in this paper. The procedure is performed on the grey <span class="hlt">level</span> output signal using image raw units with digital numbers ranging from 0 to 2(12)-1. The procedure is entirely based on statistical and experimental techniques. Design of Experiments (DoE) for Linear Models (LM) are derived to analyze the radiometric values and estimate the uncertainty. The presented linear model integrates all the individual sensor <span class="hlt">noise</span> sources in one global component and characterizes the radiometric values and the uncertainty effects according to the influential factors such as the scene reflectance, wavelength range and time. The experiments are carried out under laboratory conditions to minimize the rest of uncertainty sources that might affect the radiometric values. It is confirmed the flexibility of the procedure to model and characterize the radiometric values, as well as to determine the behaviour of two phenomena when dealing with image sensors: the <span class="hlt">noise</span> of a single image and the stability (trend and <span class="hlt">noise</span>) of a sequence of images.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27523984','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27523984"><span>Effects of cottonseed hull <span class="hlt">levels</span> in the diet and ageing time on visual and sensory meat <span class="hlt">acceptability</span> from young bulls finished in feedlot.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Eiras, C E; Guerrero, A; Valero, M V; Pardo, J A; Ornaghi, M G; Rivaroli, D C; Sañudo, C; Prado, I N</p> <p>2017-03-01</p> <p>Cottonseed hulls are co-product of agribusiness that can be used in beef cattle rations, decreasing the cost of feed. The aim of this study was to evaluate the effects of different cottonseed hull <span class="hlt">levels</span>, display and ageing times on visual and sensorial meat <span class="hlt">acceptability</span>. Longissimus thoracis muscle from 30 crossbred young bulls finished on three high-grain diets (210, 270 or 330 g/kg of cottonseed hulls on dry matter, respectively) were visually evaluated during 10 days of display by 37 appraisers. Tenderness, flavour and overall <span class="hlt">acceptability</span> from the three diets and three ageing times (1, 7 and 14 days) were evaluated by 120 consumers. On the visual study, time of display (P⩽0.001) was a more significant factor than diet. Cottonseed hull <span class="hlt">level</span> had no effect on sensorial analyses, with tenderness <span class="hlt">acceptability</span> improving with ageing time (P⩽0.001). Results indicate the possibility of using the three studied <span class="hlt">levels</span> of cottonseed without damaging consumer meat <span class="hlt">acceptability</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/16076742','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/16076742"><span>Effect of cycle time and duty cycle on psychophysically determined <span class="hlt">acceptable</span> <span class="hlt">levels</span> in a highly repetitive task.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Moore, Anne; Wells, Richard</p> <p>2005-06-10</p> <p>Psychophysical methodology has been used to develop guidelines for lifting and more recently similar methods have been applied to repetitive upper limb movements. While a range of cycle times are usually used, there is often no control for duty cycle. The purpose of this paper is to present psychophysically determined <span class="hlt">acceptable</span> torques for a common upper limb task, with both cycle time and duty cycle conditions set by the researcher. Eight female participants, sitting at adjustable workstations, performed a simulated in-line screw running task. A computer-controlled torque motor applied a torque every 3, 6, 12 or 20 s with a duty cycle of 25, 50 or 83%. The participants worked with one set of conditions each day and self-selected the highest torque that they felt was <span class="hlt">acceptable</span> without developing undue pain and discomfort. Duty cycle was found to significantly affect the amount of torque selected. With duty cycle controlled, cycle time was no longer found to have any significant effect on selected torque. <span class="hlt">Acceptable</span> torques for 25, 50 and 83% duty cycles were 1.09, 0.9 and 0.73 Nm. Discomfort and stiffness were concentrated on the back of the hand and on the thumb web. These findings suggest that increased perception of discomfort with increased frequency (decreased cycle time) may be related to decreased rest/recovery time for muscles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4552421','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4552421"><span>Do Cost Functions for Tracking Error Generalize across Tasks with Different <span class="hlt">Noise</span> <span class="hlt">Levels</span>?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Sensinger, Jonathon; Aleman-Zapata, Adrian; Englehart, Kevin</p> <p>2015-01-01</p> <p>Control of human-machine interfaces are well modeled by computational control models, which take into account the behavioral decisions people make in estimating task dynamics and state for a given control law. This control law is optimized according to a cost function, which for the sake of mathematical tractability is typically represented as a series of quadratic terms. Recent studies have found that people actually use cost functions for reaching tasks that are slightly different than a quadratic function, but it is unclear which of several cost functions best explain human behavior and if these cost functions generalize across tasks of similar nature but different scale. In this study, we used an inverse-decision-theory technique to reconstruct the cost function from empirical data collected on 24 able-bodied subjects controlling a myoelectric interface. Compared with previous studies, this experimental paradigm involved a different control source (myoelectric control, which has inherently large multiplicative <span class="hlt">noise</span>), a different control interface (control signal was mapped to cursor velocity), and a different task (the tracking position dynamically moved on the screen throughout each trial). Several cost functions, including a linear-quadratic; an inverted Gaussian, and a power function, accurately described the behavior of subjects throughout this experiment better than a quadratic cost function or other explored candidate cost functions (p<0.05). Importantly, despite the differences in the experimental paradigm and a substantially larger scale of error, we found only one candidate cost function whose parameter was consistent with the previous studies: a power function (cost ∝ errorα) with a parameter value of α = 1.69 (1.53–1.78 interquartile range). This result suggests that a power-function is a representative function of user’s error cost over a range of <span class="hlt">noise</span> amplitudes for pointing and tracking tasks. PMID:26313560</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JAG....67...66A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JAG....67...66A"><span>A seismic field test with a Low-<span class="hlt">level</span> Acoustic Combustion Source and Pseudo-<span class="hlt">Noise</span> codes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Askeland, Bjørn; Ruud, Bent Ole; Hobæk, Halvor; Mjelde, Rolf</p> <p>2009-01-01</p> <p>The Low-<span class="hlt">level</span> Acoustic Combustion Source (LACS) which can fire its pulses at a high rate, has been tested successfully as a seismic marine source on shallow ice-age sediments in Byfjorden at Bergen, Norway. Pseudo-<span class="hlt">Noise</span> pulsed signals with spiky autocorrelation functions were used to detect the sediments. Each transmitted sequence lasted 10 s and contained 43 pulses. While correlation gave a blurry result, deconvolution between the near-field recordings and the streamer recordings gave a clear seismic section. Compared to the section acquired with single air-gun shots along the same profile, the LACS gave a more clear presentation of the sediments and basement.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19740020289&hterms=materials+insulation&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dmaterials%2Binsulation','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19740020289&hterms=materials+insulation&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dmaterials%2Binsulation"><span><span class="hlt">Noise</span> and vibration <span class="hlt">level</span> reduction by covering metal structures with layers of damping materials. [considering viscoelastic insulation layers</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rugina, I.; Paven, H. T. O.</p> <p>1974-01-01</p> <p>One of the most important methods of reducing the <span class="hlt">noise</span> and vibration <span class="hlt">level</span> is the damping of the secondary sources, such as metal plates, often used in vehicle structures, by means of covering materials with high internal viscosity. Damping layers are chosen at an optimum thickness corresponding to the frequency and temperature range in which a certain structure works. The structure's response corresponding to various real situations is analyzed by means of a measuring chain including electroacoustical or electromechanical transducers. The experimental results provide the dependence of the loss factor and damping transmission coefficient as a function of the damping layer thickness or of the frequency for various viscoelastic covering materials.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19850028724&hterms=Propellers+aircraft&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DPropellers%2Baircraft','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19850028724&hterms=Propellers+aircraft&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DPropellers%2Baircraft"><span>Effects of acoustic treatment on the interior <span class="hlt">noise</span> <span class="hlt">levels</span> of a twin-engine propeller aircraft - Experimental flight results and theoretical predictions</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Beyer, T. B.; Powell, C. A.; Daniels, E. F.; Pope, L. D.</p> <p>1984-01-01</p> <p>In-flight <span class="hlt">noise</span> <span class="hlt">level</span> measurements were made within two cabin configurations of a general aviation business aircraft. The Fairchild Merlin IVC twin-engine aircraft was tested with bare walls and fiberglass insulation and in an executive trim configuration. Narrow-band and octave format data were subjected to analyses which permitted identification of the blade passage harmonics (BPH). Cabin <span class="hlt">noise</span> <span class="hlt">level</span> reductions (insertion losses) due to added insulation varied with position in the cabin, the BPH number, cabin pressure, and engine torque. The measurements were closely predicted using the propeller aircraft interior <span class="hlt">noise</span> (PAIN) mode.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19720054441&hterms=offer+acceptance&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Doffer%2Bacceptance','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19720054441&hterms=offer+acceptance&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Doffer%2Bacceptance"><span>STOL ride quality criteria - Passenger <span class="hlt">acceptance</span>.</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jacobson, I. D.; Kuhlthau, A. R.</p> <p>1972-01-01</p> <p>The ability to mathematically model human reaction to variables involved in transportation systems offers a very desirable tool both for the prediction of passenger <span class="hlt">acceptance</span> of proposed systems, and for establishing <span class="hlt">acceptance</span> criteria for the system designer. As a first step in the development of a general model for STOL systems, a mathematical formulation is presented which <span class="hlt">accepts</span> as inputs nine variables felt to be important in flight under STOL-type conditions and presents an index of human response as the output. The variables used are three linear motions, three angular motions, pressure, temperature and <span class="hlt">noise</span> <span class="hlt">level</span>. The results are used to establish specifications for stability augmentation systems to improve the ride quality of existing STOL aircraft.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3629681','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3629681"><span>Hearing Threshold, Loss, <span class="hlt">Noise</span> <span class="hlt">Levels</span> and Worker’s Profiles of an Open Cast Chromite Mines in Odisha, India</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Kerketta, Sunamani; Gartia, Rajendra; Bagh, Somanath</p> <p>2012-01-01</p> <p>Objectives: The aims of the study were to describe the <span class="hlt">noise</span> <span class="hlt">levels</span> at an open cast chromite mine in Odisha, India, and the hearing threshold of its workers and to associate their hearing loss with their age, work station and length of employment at the mine. Methods: We performed a cross-sectional study of the hearing threshold of chromite mine workers. Audiometric data from 500 subjects was collected at the mines’ hospital in the Sukinda Valley of Jajpur, Odisha, India. The latest audiometry data available for the period 2002 to 2008 was used in the analysis. Audiometric screening was performed using an audiometer (TRIVENI TAM-25 6025A) in a quiet environment by qualified technicians, audiologists or physicians. Tests were conducted on the subjects after they had completely rested for 16 hours or more after their day shift. Results: A maximum of 262 subjects (52.4%) were employed in the work zone area and a minimum of 2 subjects (0.4%) had less than 5 years working experience. The age of the subjects ranged from 29 to 59 years and their working experience ranged from 4 to 37 years. The subjects’ average mean hearing thresholds at 4, 6 and 8 kHz were 21.53 dBA, 23.40 dBA and 21.90 dBA, respectively. The maximum Leq and L90 <span class="hlt">levels</span> exceeded the prescribed limits for commercial, residential and silence zones. The maximum Leq <span class="hlt">levels</span> exceeded 95 dBA for large and medium heavy earth moving machineries (HEMMs), both outside and at the operator’s position. Hearing loss due to the subjects’ work experience was found to be greater than that attributable to age and workstation. Conclusion: In our study population, the maximum <span class="hlt">noise</span> <span class="hlt">levels</span> for large and medium HEMMs and inside the cabins of HEMMs were found to be more than 95 dBA. This indicates that operators in this particular chromite mine at Odisha, India were exposed to <span class="hlt">noise</span> <span class="hlt">levels</span> exceeding 95 dBA for more than 10% of the monitoring time. The subjects’ hearing loss was also found to increase for every 10-year</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19730006379&hterms=blast&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dblast','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19730006379&hterms=blast&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dblast"><span><span class="hlt">Noise</span> and blast</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hodge, D. C.; Garinther, G. R.</p> <p>1973-01-01</p> <p><span class="hlt">Noise</span> and blast environments are described, providing a definition of units and techniques of <span class="hlt">noise</span> measurement and giving representative booster-launch and spacecraft <span class="hlt">noise</span> data. The effects of <span class="hlt">noise</span> on hearing sensitivity and performance are reviewed, and community response to <span class="hlt">noise</span> exposure is discussed. Physiological, or nonauditory, effects of <span class="hlt">noise</span> exposure are also treated, as are design criteria and methods for minimizing the <span class="hlt">noise</span> effects of hearing sensitivity and communications. The low <span class="hlt">level</span> sound detection and speech reception are included, along with subjective and behavioral responses to <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22918144','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22918144"><span>Occupational <span class="hlt">noise</span> exposure of nightclub bar employees in Ireland.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kelly, Aoife C; Boyd, Sara M; Henehan, Gary T M; Chambers, Gordon</p> <p>2012-01-01</p> <p>Due to the transposition of the EU Directive 2003/10/EC into Irish Law, the entertainment sector was obligated to comply with the requirements of the Safety, Health and Welfare at Work (General Application) Regulations 2007, Chapter 1 Part 5: Control of <span class="hlt">Noise</span> at Work since February 2008. Compliance with the <span class="hlt">Noise</span> Regulations was examined in 9 nightclubs in Ireland. The typical daily <span class="hlt">noise</span> exposure of 19 bar employees was measured using 2 logging dosimeters and a Type 1 fixed position sound <span class="hlt">level</span> meter. Physical site inspections identified nightclub <span class="hlt">noise</span> control measures. Interviews and questionnaires were used to assess the managers and employees awareness of the <span class="hlt">noise</span> legislation. The average bar employee daily <span class="hlt">noise</span> exposure (L(EX, 8h)) was 92 dBA, almost 4 times more than the <span class="hlt">accepted</span> legal limit. None of the venues examined were fully compliant with the requirements of the 2007 <span class="hlt">Noise</span> Regulations, and awareness of this legislation was limited.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118.1977D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118.1977D"><span>The challenges of lawnmower <span class="hlt">noise</span> reduction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Drutowski, Carol J.; Fetzer, Keith</p> <p>2005-09-01</p> <p>The European <span class="hlt">Noise</span> Directive (2000/14/EC) became effective in the year 2000, limiting the allowable <span class="hlt">noise</span> <span class="hlt">level</span> for lawnmowers sold in the European Union. <span class="hlt">Noise</span> <span class="hlt">level</span> limits are based on cutting width. The Directive requires that manufacturers meet these limits and include statistical uncertainties, then declare their <span class="hlt">noise</span> <span class="hlt">levels</span> and have these results certified by an independent third party agency. There are two major challenges with this Directive. First by taking statistical uncertainties into account, this creates a limit lower than the published limit. Second is to lower the sound power <span class="hlt">level</span> while still maintaining <span class="hlt">acceptable</span> performance. The physical phenomena that generate the unwanted <span class="hlt">noise</span> of a lawnmower are also used to perform work. For rotary lawnmowers, a dominant <span class="hlt">noise</span> source is the cutting deck assembly, which is required to lift and cut grass, then dispose of the clippings. To cut grass with a good quality of cut appearance, the blades are required to turn at a very high tip speed to generate the necessary airflow. For lawnmowers, <span class="hlt">noise</span> <span class="hlt">levels</span> and unit performance are intrinsically linked. This has frustrated our industry for over 20 years.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25566106','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25566106"><span>Low number of luminance <span class="hlt">levels</span> in the luminance <span class="hlt">noise</span> increases color discrimination thresholds estimated with pseudoisochromatic stimuli.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Souza, Givago S; Malone, Felecia L; Crawford, Teera L; Miquilini, Letícia; Salomão, Raílson C; Guimarães, Diego L; Ventura, Dora F; Fitzgerald, Malinda E C; Silveira, Luiz Carlos L</p> <p>2014-01-01</p> <p>In pseudoisochromatic stimuli the presence of spatial and luminance <span class="hlt">noise</span> forces the subject to discriminate the target from the background solely on the basis of chromaticity difference. Color-blind subjects may show difficulty to identify the target due to the elimination of borders and brightness clues caused by the luminance and spatial <span class="hlt">noise</span>. Few studies have fully described the features of pseudoisochromatic stimuli. Fewer investigators have focused their studies in the effects of specific pseudoisochromatic parameters on color discrimination. We used the Cambridge Color Test (CCT) to investigate the influence on color discrimination thresholds due to the number of luminance <span class="hlt">levels</span> present in the luminance <span class="hlt">noise</span>. The CCT default has six luminance steps; however, in our investigation a total of eight different conditions were tested from 2 to 16 luminance steps. It was found that the CCT provided very robust values for color discrimination thresholds, which were degraded only for very small number of luminance steps. When the number of steps was increased, the color discrimination thresholds improved from 2 to 6 luminance steps and gradually reached a plateau for 10 or more luminance steps. The area of color discrimination ellipses as a function of luminance steps matches the relative proportion of ineffective contrasts between mosaic patches as a function of luminance steps, assuming that contrast becomes ineffective for values 18.6% or less. The lower number of color and luminance interactions in these conditions could explain the measured increase of color discrimination thresholds. The primary conclusion from this investigation was that results from pseudoisochromatic tests should have their parameters described in more detail. This type of description would allow a better understanding of the results provided, interpretations, and therefore cross study comparison of results obtained from different laboratories.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4274881','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4274881"><span>Low number of luminance <span class="hlt">levels</span> in the luminance <span class="hlt">noise</span> increases color discrimination thresholds estimated with pseudoisochromatic stimuli</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Souza, Givago S.; Malone, Felecia L.; Crawford, Teera L.; Miquilini, Letícia; Salomão, Raílson C.; Guimarães, Diego L.; Ventura, Dora F.; Fitzgerald, Malinda E. C.; Silveira, Luiz Carlos L.</p> <p>2014-01-01</p> <p>In pseudoisochromatic stimuli the presence of spatial and luminance <span class="hlt">noise</span> forces the subject to discriminate the target from the background solely on the basis of chromaticity difference. Color-blind subjects may show difficulty to identify the target due to the elimination of borders and brightness clues caused by the luminance and spatial <span class="hlt">noise</span>. Few studies have fully described the features of pseudoisochromatic stimuli. Fewer investigators have focused their studies in the effects of specific pseudoisochromatic parameters on color discrimination. We used the Cambridge Color Test (CCT) to investigate the influence on color discrimination thresholds due to the number of luminance <span class="hlt">levels</span> present in the luminance <span class="hlt">noise</span>. The CCT default has six luminance steps; however, in our investigation a total of eight different conditions were tested from 2 to 16 luminance steps. It was found that the CCT provided very robust values for color discrimination thresholds, which were degraded only for very small number of luminance steps. When the number of steps was increased, the color discrimination thresholds improved from 2 to 6 luminance steps and gradually reached a plateau for 10 or more luminance steps. The area of color discrimination ellipses as a function of luminance steps matches the relative proportion of ineffective contrasts between mosaic patches as a function of luminance steps, assuming that contrast becomes ineffective for values 18.6% or less. The lower number of color and luminance interactions in these conditions could explain the measured increase of color discrimination thresholds. The primary conclusion from this investigation was that results from pseudoisochromatic tests should have their parameters described in more detail. This type of description would allow a better understanding of the results provided, interpretations, and therefore cross study comparison of results obtained from different laboratories. PMID:25566106</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/390298','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/390298"><span>Limiting valve <span class="hlt">noise</span> in gas metering, reducing stations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Boyle, S.J.</p> <p>1996-07-01</p> <p>There are three general reasons why valve <span class="hlt">noise</span> should be a concern. First, workplace <span class="hlt">noise</span> can result in gradual, job-related hearing loss to employees over a period of years. Second, communities often have restrictions on <span class="hlt">acceptable</span> <span class="hlt">levels</span>, hours during which <span class="hlt">noise</span> can occur, and factors like duration and frequency of <span class="hlt">noise</span>. Last, extremely high <span class="hlt">noise</span> <span class="hlt">levels</span> can cause serious damage, failure and malfunction to valves, piping and related equipment. Special low <span class="hlt">noise</span> valves make less <span class="hlt">noise</span> than conventional valves. They use one of three design strategies: multipath--splitting the flow into many small orifices; multistage--splitting the pressure drop into a series of smaller steps; and multipath/multistage combined in a single unit. Another approach to reducing <span class="hlt">noise</span> generation involves placing carefully sized static restrictors in the pipeline. The restrictor absorbs a portion of the system pressure drop, so the valve`s share of the drop is lowered. While the restrictor and valve both make <span class="hlt">noise</span>, the net sound <span class="hlt">level</span> is reduced. Another approach is to allow the <span class="hlt">noise</span> to happen, then hide it. Some methods include: pipe insulation, thermal or acoustic; heavy wall pipe; buried valves; silences; and sound enclosures. These approaches can work in some cases, but caution must be used. The major drawback with all these approaches is that the damage potential associated with extreme <span class="hlt">noise</span>, turbulence, and vibration still exists at some locations in the system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1987aiaa.meetQ....L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1987aiaa.meetQ....L"><span>Structureborne <span class="hlt">noise</span> control in advanced turboprop aircraft</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Loeffler, Irvin J.</p> <p>1987-01-01</p> <p>Structureborne <span class="hlt">noise</span> is discussed as a contributor to propeller aircraft interior <span class="hlt">noise</span> <span class="hlt">levels</span> that are nonresponsive to the application of a generous amount of cabin sidewall acoustic treatment. High structureborne <span class="hlt">noise</span> <span class="hlt">levels</span> may jeopardize passenger <span class="hlt">acceptance</span> of the fuel-efficient high-speed propeller transport aircraft designed for cruise at Mach 0.65 to 0.85. These single-rotation tractor and counter-rotation tractor and pusher propulsion systems will consume 15 to 30 percent less fuel than advanced turbofan systems. Structureborne <span class="hlt">noise</span> detection methodologies and the importance of development of a structureborne <span class="hlt">noise</span> sensor are discussed. A structureborne <span class="hlt">noise</span> generation mechanism is described in which the periodic components or propeller swirl produce periodic torques and forces on downstream wings and airfoils that are propagated to the cabin interior as <span class="hlt">noise</span>. Three concepts for controlling structureborne <span class="hlt">noise</span> are presented: (1) a stator row swirl remover, (2) selection of a proper combination of blade numbers in the rotor/stator system of a single-rotation propeller, and the rotor/rotor system of a counter-rotation propeller, and (3) a tuned mechanical absorber.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1334289','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1334289"><span>Development of a laser Doppler displacement encoder system with ultra-low-<span class="hlt">noise-level</span> for linear displacement measurement with subnanometer resolution - Final CRADA Report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shu, Deming</p> <p>2016-01-01</p> <p>An U.S. DOE Cooperative Research and Development Agreement (CRADA) between ANL and Optodyne, Inc. has been established to develop a prototype laser Doppler displacement encoder system with ultra-low <span class="hlt">noise</span> <span class="hlt">level</span> for linear measurements to sub-nanometer resolution for synchrotron radiation applications. We have improved the heterodyne efficiency and reduced the detector shot <span class="hlt">noises</span> by proper shielding and adding a low-pass filter. The laser Doppler displacement encoder system prototype demonstrated a ~ 1 nm system output <span class="hlt">noise</span> floor with single reflection optics. With multiple-pass optical arrangement, 0.1 nm scale closed-loop feedback control is achieved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol19/pdf/CFR-2010-title40-vol19-sec86-610-98.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title40-vol19/pdf/CFR-2010-title40-vol19-sec86-610-98.pdf"><span>40 CFR 86.610-98 - Compliance with <span class="hlt">acceptable</span> quality <span class="hlt">level</span> and passing and failing criteria for Selective...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-07-01</p> <p>... <span class="hlt">level</span> and passing and failing criteria for Selective Enforcement Audits. 86.610-98 Section 86.610-98... quality <span class="hlt">level</span> and passing and failing criteria for Selective Enforcement Audits. (a) The prescribed... test procedures pursuant to § 86.608-98(a). (c)(1) Pass/fail criteria. The manufacturer shall...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18923887','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18923887"><span>The cultural and community-<span class="hlt">level</span> <span class="hlt">acceptance</span> of antiretroviral therapy (ART) among traditional healers in Eastern Cape, South Africa.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shuster, Justin M; Sterk, Claire E; Frew, Paula M; del Rio, Carlos</p> <p>2009-02-01</p> <p>The HIV/AIDS epidemic has profoundly impacted South Africa's healthcare system, greatly hampering its ability to scale-up the provision of antiretroviral therapy (ART). While one way to provide comprehensive care and prevention in sub-Saharan African countries has been through collaboration with traditional healers, long-term support specifically for ART has been low within this population. An exploratory, qualitative research project was conducted among 25 self-identified traditional healers between June and August of 2006 in the Lukhanji District of South Africa. By obtaining the opinions of traditional healers currently interested in biomedical approaches to HIV/AIDS care and prevention, this formative investigation identified a range of motivational factors that were believed to promote a deeper <span class="hlt">acceptance</span> of and support for ART. These factors included cultural consistencies between traditional and biomedical medicine, education, as well as legal and financial incentives to collaborate. Through an incorporation of these factors into future HIV/AIDS treatment programs, South Africa and other sub-Saharan countries may dramatically strengthen their ability to provide ART in resource-poor settings.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/8984520','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/8984520"><span>[Intelligence quotient <span class="hlt">levels</span>, aspiration and self-<span class="hlt">acceptance</span> in patients with restricting and binge-eating type of anorexia nervosa].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rajewski, A; Talarczyk-Wieckowska, M</p> <p>1996-01-01</p> <p>A group of 50 patients aged from 12 to 20 with anorexia nervosa was examined: 40 persons with a diagnosis of restricting type and 10 with binge-eating type according to DSM IV. The <span class="hlt">level</span> of intelligence quotient (IQ) was estimated by using Wechsler Test, selfacceptation by SQ and aspiration by TAT and test of unfinished sentences. In the majority of patients IQ was stated on the average <span class="hlt">level</span>. Independently of intellectual <span class="hlt">level</span> all patients presented a high aspiration degree. In their own estimation the emotional motivation sphere was significantly more important in the patients with binge-eating type and intellectual in the patients with restricting type of anorexia nervosa.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=study+AND+space&pg=2&id=EJ1089366','ERIC'); return false;" href="http://eric.ed.gov/?q=study+AND+space&pg=2&id=EJ1089366"><span><span class="hlt">Noise</span> Management in Twenty-First Century Libraries: Case Studies of Four U.S. Academic Institutions</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Franks, Janet E.; Asher, Darla C.</p> <p>2014-01-01</p> <p>University libraries have had to provide <span class="hlt">acceptable</span> <span class="hlt">noise</span> <span class="hlt">levels</span> for many years and this pressure has not diminished in the twenty-first century. Library space has to be utilized to ensure <span class="hlt">noise</span> <span class="hlt">levels</span> are best managed. A study was undertaken across four university libraries in South Florida to determine how universities utilized their limited…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EGUGA..1710422T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EGUGA..1710422T"><span>Contribution of seasonal presence of cetaceans, earthquakes, drifting icebergs and anthropogenic activity to the ambient <span class="hlt">noise</span> <span class="hlt">level</span> in the Southern Indian Ocean</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tsang-Hin-Sun, Eve; Royer, Jean-Yves</p> <p>2015-04-01</p> <p>Assessing the ambient sound <span class="hlt">level</span> in the oceans is essential for a better understanding of the interactions between the ecosystem and anthropogenic activities. Ambient <span class="hlt">noise</span> studies conducted in the North Pacific and Atlantic oceans, have shown that since the 60's oceanic <span class="hlt">noise</span> <span class="hlt">level</span> increases with the ship traffic, even if potential impacts of shipping <span class="hlt">noise</span> on the ecosystem is not yet fully understood. However long-term acoustic records for the Indian Ocean are still limited. Here we present long-term statistics on the ambient sound in the Southern Indian Ocean basin based on 2 years of data collected at 5 widely distributed autonomous hydrophones. The data consist of single hydrophone spectra (10-100 Hz in 1-Hz bins) averaged using Welch's method over 200 s. Spectral probability distributions of the ambient sound <span class="hlt">level</span> are analyzed in order to identify the main sound sources and their geographical and time variability. The mean sound <span class="hlt">level</span> within the array is 10 to 20 dB lower than in other oceans, revealing a weaker influence of shipping on the Southern Indian Ocean <span class="hlt">noise</span> budget. Seismic events are evenly distributed in time and space and mostly contribute to the general low-frequency background <span class="hlt">noise</span>. Periodic signals are mainly associated with the seasonal presence of 3 types of blue whales and fin whales whose signatures are easily identified at target frequencies. Winter lows and summer highs of the ambient <span class="hlt">noise</span> <span class="hlt">levels</span> are also well correlated with ice volume variations. Icebergs are found to be a major sound source, strongly contributing to seasonal variations even at northernmost sites of the array. Although anthropogenic factors do not seem to dominate the <span class="hlt">noise</span> spectrum, shipping sounds are present north and east of the array. Observed higher sound <span class="hlt">levels</span> are consistent with the proximity of major traffic lanes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21173481','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21173481"><span>A study on the contribution of body vibrations to the vibratory sensation induced by high-<span class="hlt">level</span>, complex low-frequency <span class="hlt">noise</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Takahashi, Yukio</p> <p>2011-01-01</p> <p>To investigate the contribution of body vibrations to the vibratory sensation induced by high-<span class="hlt">level</span>, complex low-frequency <span class="hlt">noise</span>, we conducted two experiments. In Experiment 1, eight male subjects were exposed to seven types of low-frequency <span class="hlt">noise</span> stimuli: two pure tones [a 31.5-Hz, 100-dB(SPL) tone and a 50-Hz, 100-dB(SPL) tone] and five complex <span class="hlt">noises</span> composed of the pure tones. For the complex <span class="hlt">noise</span> stimuli, the sound pressure <span class="hlt">level</span> of one tonal component was 100 dB(SPL) and that of another one was either 90, 95, or 100 dB(SPL). Vibration induced on the body surface was measured at five locations, and the correlation with the subjective rating of the vibratory sensation at each site of measurement was examined. In Experiment 2, the correlation between the body surface vibration and the vibratory sensation was similarly examined using seven types of <span class="hlt">noise</span> stimuli composed of a 25-Hz tone and a 50-Hz tone. In both the experiments, we found that at the chest and the abdomen, the rating of the vibratory sensation was in close correlation with the vibration acceleration <span class="hlt">level</span> (VAL) of the body surface vibration measured at each corresponding location. This was consistent with our previous results and suggested that at the trunk of the body (the chest and the abdomen), the mechanoreception of body vibrations plays an important role in the experience of the vibratory sensation in persons exposed to high-<span class="hlt">level</span> low-frequency <span class="hlt">noise</span>. At the head, however, no close correlation was found between the rating of the vibratory sensation and the VAL of body surface vibration. This suggested that at the head, the perceptual mechanisms of vibration induced by high-<span class="hlt">level</span> low-frequency <span class="hlt">noise</span> were different from those in the trunk of the body.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/2489754','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/2489754"><span>[Analysing <span class="hlt">noise</span> <span class="hlt">levels</span> in dental environment. Air turbine sound response to various physical factors].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Oka, S</p> <p>1989-10-01</p> <p>Dental Air Turbine sound depends on the mechanical performance such as rotation and it is impossible to neglect connections of the sound with fluid mechanics and acoustics. Turbine sound must be considered from the standpoint of the sound pressure <span class="hlt">level</span> and frequency component. In this study, the sound samples was measured and analysed in octave band spectrum. Turbine sound has three resonance bands of the frequency with the range from 0 to 1,600 Hz and the resonance band increased as air pressure increased. The frequency of the second resonance band decreased as the cutting load and cutting point diameter increased. Damping of the second resonance band frequency shifted downward by polishing point.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800003619','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800003619"><span>A method for predicting the <span class="hlt">noise</span> <span class="hlt">levels</span> of coannular jets with inverted velocity profiles</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Russell, J. W.</p> <p>1979-01-01</p> <p>A coannular jet was equated with a single stream equivalent jet with the same mass flow, energy, and thrust. The acoustic characteristics of the coannular jet were then related to the acoustic characteristics of the single jet. Forward flight effects were included by incorporating a forward exponent, a Doppler amplification factor, and a Strouhal frequency shift. Model test data, including 48 static cases and 22 wind tunnel cases, were used to evaluate the prediction method. For the static cases and the low forward velocity wind tunnel cases, the spectral mean square pressure correlation coefficients were generally greater than 90 percent, and the spectral sound pressure <span class="hlt">level</span> standard deviation were generally less than 3 decibels. The correlation coefficient and the standard deviation were not affected by changes in equivalent jet velocity. Limitations of the prediction method are also presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999AtmEn..33.4327M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999AtmEn..33.4327M"><span>ETS <span class="hlt">levels</span> in hospitality environments satisfying ASHRAE standard 62-1989: "ventilation for <span class="hlt">acceptable</span> indoor air quality"</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Moschandreas, D. J.; Vuilleumier, K. L.</p> <p></p> <p>Prior to this study, indoor air constituent <span class="hlt">levels</span> and ventilation rates of hospitality environments had not been measured simultaneously. This investigation measured indoor Environmental Tobacco Smoke-related (ETS-related) constituent <span class="hlt">levels</span> in two restaurants, a billiard hall and a casino. The objective of this study was to characterize ETS-related constituent <span class="hlt">levels</span> inside hospitality environments when the ventilation rates satisfy the requirements of the ASHRAE 62-1989 Ventilation Standard. The ventilation rate of each selected hospitality environment was measured and adjusted. The study advanced only if the requirements of the ASHRAE 62-1989 Ventilation Standard - the pertinent standard of the American Society of Heating, Refrigeration and Air Conditioning Engineers - were satisfied. The supply rates of outdoor air and occupant density were measured intermittently to assure that the ventilation rate of each facility satisfied the standard under occupied conditions. Six ETS-related constituents were measured: respirable suspended particulate (RSP) matter, fluorescent particulate matter (FPM, an estimate of the ETS particle concentrations), ultraviolet particulate matter (UVPM, a second estimate of the ETS particle concentrations), solanesol, nicotine and 3-ethenylpyridine (3-EP). ETS-related constituent <span class="hlt">levels</span> in smoking sections, non-smoking sections and outdoors were sampled daily for eight consecutive days at each hospitality environment. This study found that the difference between the concentrations of ETS-related constituents in indoor smoking and non-smoking sections was statistically significant. Differences between indoor non-smoking sections and outdoor ETS-related constituent <span class="hlt">levels</span> were identified but were not statistically significant. Similarly, differences between weekday and weekend evenings were identified but were not statistically significant. The difference between indoor smoking sections and outdoors was statistically significant. Most</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20050111478','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20050111478"><span>Low <span class="hlt">Noise</span> Exhaust Nozzle Technology Development</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Majjigi, R. K.; Balan, C.; Mengle, V.; Brausch, J. F.; Shin, H.; Askew, J. W.</p> <p>2005-01-01</p> <p>NASA and the U.S. aerospace industry have been assessing the economic viability and environmental <span class="hlt">acceptability</span> of a second-generation supersonic civil transport, or High Speed Civil Transport (HSCT). Development of a propulsion system that satisfies strict airport <span class="hlt">noise</span> regulations and provides high <span class="hlt">levels</span> of cruise and transonic performance with adequate takeoff performance, at an <span class="hlt">acceptable</span> weight, is critical to the success of any HSCT program. The principal objectives were to: 1. Develop a preliminary design of an innovative 2-D exhaust nozzle with the goal of meeting FAR36 Stage III <span class="hlt">noise</span> <span class="hlt">levels</span> and providing high <span class="hlt">levels</span> of cruise performance with a high specific thrust for Mach 2.4 HSCT with a range of 5000 nmi and a payload of 51,900 lbm, 2. Employ advanced acoustic and aerodynamic codes during preliminary design, 3. Develop a comprehensive acoustic and aerodynamic database through scale-model testing of low-<span class="hlt">noise</span>, high-performance, 2-D nozzle configurations, based on the preliminary design, and 4. Verify acoustic and aerodynamic predictions by means of scale-model testing. The results were: 1. The preliminary design of a 2-D, convergent/divergent suppressor ejector nozzle for a variable-cycle engine powered, Mach 2.4 HSCT was evolved, 2. <span class="hlt">Noise</span> goals were predicted to be achievable for three takeoff scenarios, and 3. Impact of <span class="hlt">noise</span> suppression, nozzle aerodynamic performance, and nozzle weight on HSCT takeoff gross weight were assessed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1989JSV...133..117O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1989JSV...133..117O"><span>Sleep disturbance, psycho-social and medical symptoms—A pilot survey among persons exposed to high <span class="hlt">levels</span> of road traffic <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Öhrström, E.</p> <p>1989-08-01</p> <p>A pilot survey was undertaken to elucidate sleep quality, as well as psycho-social and medical symptoms and mood, among people who had lived for many years in an area with high <span class="hlt">levels</span> of road traffic <span class="hlt">noise</span> during night hours and inhabitants of a quiet control area: 106 personal interviews were performed and specific questionnaires on sleep and mood answered by 63 persons during three consecutive days. It was found that both sleep quality and mood (social orientation, activity, wellbeing and extroversion) were depressed in the noisy area as compared with a control area. Symptoms of tiredness, headache and nervous stomach disorders were more frequent. A significant relationship between sensitivity to <span class="hlt">noise</span> and sleep quality was also found. From this pilot study hypotheses may be formulated about a relationship between environmental <span class="hlt">noise</span> and different psycho-social and medical symptoms. It is suggested that similar studies on a larger scale are performed to elucidate long-term effects of <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840027014','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840027014"><span>Supersonic jet shock <span class="hlt">noise</span> reduction</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Stone, J. R.</p> <p>1984-01-01</p> <p>Shock-cell <span class="hlt">noise</span> is identified to be a potentially significant problem for advanced supersonic aircraft at takeoff. Therefore NASA conducted fundamental studies of the phenomena involved and model-scale experiments aimed at developing means of <span class="hlt">noise</span> reduction. The results of a series of studies conducted to determine means by which supersonic jet shock <span class="hlt">noise</span> can be reduced to <span class="hlt">acceptable</span> <span class="hlt">levels</span> for advanced supersonic cruise aircraft are reviewed. Theoretical studies were conducted on the shock associated <span class="hlt">noise</span> of supersonic jets from convergent-divergent (C-D) nozzles. Laboratory studies were conducted on the influence of narrowband shock screech on broadband <span class="hlt">noise</span> and on means of screech reduction. The usefulness of C-D nozzle passages was investigated at model scale for single-stream and dual-stream nozzles. The effect of off-design pressure ratio was determined under static and simulated flight conditions for jet temperatures up to 960 K. Annular and coannular flow passages with center plugs and multi-element suppressor nozzles were evaluated, and the effect of plug tip geometry was established. In addition to the far-field acoustic data, mean and turbulent velocity distributions were measured with a laser velocimeter, and shadowgraph images of the flow field were obtained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18773929','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18773929"><span>Effects of nocturnal railway <span class="hlt">noise</span> on sleep fragmentation in young and middle-aged subjects as a function of type of train and sound <span class="hlt">level</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Saremi, Mahnaz; Grenèche, Jérôme; Bonnefond, Anne; Rohmer, Odile; Eschenlauer, Arnaud; Tassi, Patricia</p> <p>2008-12-01</p> <p>Due to undisputable effects of <span class="hlt">noise</span> on sleep structure, especially in terms of sleep fragmentation, the expected development of railway transportation in the next few years might represent a potential risk factor for people living alongside the rail tracks. The aim of this study was to compare the effects of different types of train (freight, automotive, passenger) on arousal from sleep and to determine any differential impact as a function of sound <span class="hlt">level</span> and age. Twenty young (16 women, 4 men; 25.8 years+/-2.6) and 18 middle-aged (15 women, 3 men; 52.2 years+/-2.5) healthy subjects participated in three whole-night polysomnographic recordings including one control night (35 dBA), and two noisy nights with equivalent <span class="hlt">noise</span> <span class="hlt">levels</span> of 40 or 50 dB(A), respectively. Arousal responsiveness increased with sound <span class="hlt">level</span>. It was the highest in S2 and the lowest in REM sleep. Micro-arousals (3-10 s) occurred at a rate of 25-30%, irrespective of the type of train. Awakenings (>10 s) were produced more frequently by freight train than by automotive and passenger trains. Normal age-related changes in sleep were observed, but they were not aggravated by railway <span class="hlt">noise</span>, thus questioning whether older persons are less sensitive to <span class="hlt">noise</span> during sleep. These evidences led to the conclusion that microscopic detection of sleep fragmentation may provide advantageous information on sleep disturbances caused by environmental <span class="hlt">noises</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/5609147','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/5609147"><span>High <span class="hlt">acceptance</span> recoil polarimeter</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>The HARP Collaboration</p> <p>1992-12-05</p> <p>In order to detect neutrons and protons in the 50 to 600 MeV energy range and measure their polarization, an efficient, low-<span class="hlt">noise</span>, self-calibrating device is being designed. This detector, known as the High <span class="hlt">Acceptance</span> Recoil Polarimeter (HARP), is based on the recoil principle of proton detection from np[r arrow]n[prime]p[prime] or pp[r arrow]p[prime]p[prime] scattering (detected particles are underlined) which intrinsically yields polarization information on the incoming particle. HARP will be commissioned to carry out experiments in 1994.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016EnOp...48.1350H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016EnOp...48.1350H"><span>Inexact fuzzy integer chance constraint programming approach for <span class="hlt">noise</span> control within an urban environment</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Huang, Kai; Huang, Gordon; Dai, Liming; Fan, Yurui</p> <p>2016-08-01</p> <p>This article introduces an inexact fuzzy integer chance constraint programming (IFICCP) approach for identifying <span class="hlt">noise</span> reduction strategy under uncertainty. The IFICCP method integrates the interval programming and fuzzy chance constraint programming approaches into a framework, which is able to deal with uncertainties expressed as intervals and fuzziness. The proposed IFICCP model can be converted into two deterministic submodels corresponding to the optimistic and pessimistic conditions. The modelling approach is applied to a hypothetical control measure selection problem for <span class="hlt">noise</span> reduction. Results of the case study indicate that useful solutions for <span class="hlt">noise</span> control practices can be acquired. Three <span class="hlt">acceptable</span> <span class="hlt">noise</span> <span class="hlt">levels</span> for two communities are considered. For each <span class="hlt">acceptable</span> <span class="hlt">noise</span> <span class="hlt">level</span>, several decision alternatives have been obtained and analysed under different fuzzy confidence <span class="hlt">levels</span>, which reflect the trade-offs between environmental and economic considerations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002ASAJ..111.2336V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002ASAJ..111.2336V"><span>Dragline <span class="hlt">noise</span> survey</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vipperman, Jeffrey S.; Bauer, Eric R.</p> <p>2002-05-01</p> <p>It is estimated that 70%-90% of miners have enough <span class="hlt">noise</span> induced hearing loss (NIHL) to be classified as a disability (NIOSH, Publication No. 76-172, 1976; Franks, NIOSH Internal Report, 1996). In response, NIOSH is conducting a cross-sectional survey of the mining industry in order to determine the sources of mining <span class="hlt">noise</span> and offer recommendations on how to mitigate high <span class="hlt">noise</span> <span class="hlt">levels</span>, and bring mining operations into compliance with the recent mining <span class="hlt">noise</span> regulation: 30CFR, Part 62. This paper will outline the results from <span class="hlt">noise</span> surveys of eight draglines which operate in above-ground coal mining operations. The data recorded include <span class="hlt">noise</span> dosimetry in conjunction with time-at-task studies and 1/3-octave sound <span class="hlt">level</span> (Leq, Lmin, and Lmax) measurements. The 1/3-octave band readings were used to create <span class="hlt">noise</span> contour maps which allowed the spatial and frequency information of the <span class="hlt">noise</span> to be considered. Comparison of Lmin and Lmax <span class="hlt">levels</span> offer insight into the variability of the <span class="hlt">noise</span> <span class="hlt">levels</span> inside the dragline. The potential for administrative controls is limited due to consistently high <span class="hlt">noise</span> <span class="hlt">levels</span> throughout the deck. Implementation of engineering controls is also hindered by the size and number of the <span class="hlt">noise</span> sources and the frequency content of the <span class="hlt">noise</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870004687','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870004687"><span>Effects of background <span class="hlt">noise</span> on total <span class="hlt">noise</span> annoyance</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Willshire, K. F.</p> <p>1987-01-01</p> <p>Two experiments were conducted to assess the effects of combined community <span class="hlt">noise</span> sources on annoyance. The first experiment baseline relationships between annoyance and <span class="hlt">noise</span> <span class="hlt">level</span> for three community <span class="hlt">noise</span> sources (jet aircraft flyovers, traffic and air conditioners) presented individually. Forty eight subjects evaluated the annoyance of each <span class="hlt">noise</span> source presented at four different <span class="hlt">noise</span> <span class="hlt">levels</span>. Results indicated the slope of the linear relationship between annoyance and <span class="hlt">noise</span> <span class="hlt">level</span> for the traffic <span class="hlt">noise</span> was significantly different from that of aircraft and of air conditioner <span class="hlt">noise</span>, which had equal slopes. The second experiment investigated annoyance response to combined <span class="hlt">noise</span> sources, with aircraft <span class="hlt">noise</span> defined as the major <span class="hlt">noise</span> source and traffic and air conditioner <span class="hlt">noise</span> as background <span class="hlt">noise</span> sources. Effects on annoyance of <span class="hlt">noise</span> <span class="hlt">level</span> differences between aircraft and background <span class="hlt">noise</span> for three total <span class="hlt">noise</span> <span class="hlt">levels</span> and for both background <span class="hlt">noise</span> sources were determined. A total of 216 subjects were required to make either total or source specific annoyance judgements, or a combination of the two, for a wide range of combined <span class="hlt">noise</span> conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006PhDT.......268M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006PhDT.......268M"><span>Assessment and evaluation of <span class="hlt">noise</span> controls on roof bolting equipment and a method for predicting sound pressure <span class="hlt">levels</span> in underground coal mining</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Matetic, Rudy J.</p> <p></p> <p>Over-exposure to <span class="hlt">noise</span> remains a widespread and serious health hazard in the U.S. mining industries despite 25 years of regulation. Every day, 80% of the nation's miners go to work in an environment where the time weighted average (TWA) <span class="hlt">noise</span> <span class="hlt">level</span> exceeds 85 dBA and more than 25% of the miners are exposed to a TWA <span class="hlt">noise</span> <span class="hlt">level</span> that exceeds 90 dBA, the permissible exposure limit (PEL). Additionally, MSHA coal <span class="hlt">noise</span> sample data collected from 2000 to 2002 show that 65% of the equipment whose operators exceeded 100% <span class="hlt">noise</span> dosage comprise only seven different types of machines; auger miners, bulldozers, continuous miners, front end loaders, roof bolters, shuttle cars (electric), and trucks. In addition, the MSHA data indicate that the roof bolter is third among all the equipment and second among equipment in underground coal whose operators exceed 100% dosage. A research program was implemented to: (1) determine, characterize and to measure sound power <span class="hlt">levels</span> radiated by a roof bolting machine during differing drilling configurations (thrust, rotational speed, penetration rate, etc.) and utilizing differing types of drilling methods in high compressive strength rock media (>20,000 psi). The research approach characterized the sound power <span class="hlt">level</span> results from laboratory testing and provided the mining industry with empirical data relative to utilizing differing <span class="hlt">noise</span> control technologies (drilling configurations and types of drilling methods) in reducing sound power <span class="hlt">level</span> emissions on a roof bolting machine; (2) distinguish and correlate the empirical data into one, statistically valid, equation, in which, provided the mining industry with a tool to predict overall sound power <span class="hlt">levels</span> of a roof bolting machine given any type of drilling configuration and drilling method utilized in industry; (3) provided the mining industry with several approaches to predict or determine sound pressure <span class="hlt">levels</span> in an underground coal mine utilizing laboratory test results from a roof bolting</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1238744','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1238744"><span>Completion of <span class="hlt">Level</span> 4 Milestone M4AT-15OR2301039 for the Johnson <span class="hlt">Noise</span> Thermometry for Drift-free Temperature Measurements Work Package AT-15OR230103</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Britton Jr, Charles L.</p> <p>2015-09-14</p> <p>This memorandum constitutes our September 2015 <span class="hlt">level</span> 4 milestone for the project entitled “Johnson <span class="hlt">Noise</span> Thermometry for Drift-free Temperature Measurements” and satisfies the Milestone/Activity (Conclude HFIR field demonstration of JNT prototype). The progress summary describes the work performed to complete the subject milestone.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25880597','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25880597"><span>Replacing fish meal by food waste to produce lower trophic <span class="hlt">level</span> fish containing <span class="hlt">acceptable</span> <span class="hlt">levels</span> of polycyclic aromatic hydrocarbons: Health risk assessments.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cheng, Zhang; Mo, Wing-Yin; Lam, Cheung-Lung; Choi, Wai-Ming; Wong, Ming-Hung</p> <p>2015-08-01</p> <p>This study aimed at using different types of food wastes (mainly containing cereal [food waste A] and meat meal [food waste B]) as major sources of protein to replace the fish meal used in fish feeds to produce quality fish. The traditional fish farming model used to culture low trophic <span class="hlt">level</span> fish included: bighead, (Hypophthalmichthys nobilis), grass carp, (Ctenopharyngodon idellus), and mud carp, (Cirrhinus molitorella) of omnivorous chain. The results indicated that grass carp and bighead carp fed with food waste feeds were relatively free of PAHs. The results of health risk assessment showed that the fish fed with food waste feeds were safe for consumption from the PAHs perspective.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016EGUGA..1811791R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016EGUGA..1811791R"><span>Sea <span class="hlt">level</span> estimate from multi-frequency signal-to-<span class="hlt">noise</span> ratio data collected by a single geodetic receiver</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roussel, Nicolas; Frappart, Frédéric; Ramillien, Guillaume; Darrozes, José; Cornu, Gwendolyne; Koummarasy, Khanithalath</p> <p>2016-04-01</p> <p>GNSS-Reflectometry (GNSS-R) altimetry has demonstrated a strong potential for sea <span class="hlt">level</span> monitoring. Interference Pattern Technique (IPT) based on the analysis of the Signal-to-<span class="hlt">Noise</span> Ratio (SNR) estimated by a GNSS receiver, presents the main advantage of being applicable everywhere by using a single geodetic antenna and receiver, transforming them to real tide gauges. Such a technique has already been tested in various configurations of acquisition of surface-reflected GNSS signals with an accuracy of a few centimeters. Nevertheless, the classical SNR analysis method for estimating the reflecting surface-antenna height is limited by an approximation: the vertical velocity of the reflecting surface must be negligible. Authors present a significant improvement of the SNR technique to solve this problem and broaden the scope of SNR-based tide monitoring. The performances achieved on the different GNSS frequency band (L1, L2 and L5) are analyzed. The method is based on a Least-Mean Square Resolution Method (LSM), combining simultaneous measurements from different GNSS constellations (GPS, GLONASS), which permits to take the dynamic of the surface into account. It was validated in situ [1], with an antenna placed at 60 meters above the Atlantic Ocean surface with variations reaching ±3 meters, and amplitude rate of the semi-diurnal tide up to 0.5 mm/s. Over the three months of SNR records on L1 frequency band for sea <span class="hlt">level</span> determination, we found linear correlations of 0.94 by comparing with a classical tide gauge record. Our SNR-based time series was also compared to a tide theoretical model and amplitudes and phases of the main astronomical periods (6-, 12- and 24-h) were perfectly well detected. Waves and swell are also likely to be detected. If the validity of our method is already well-established with L1 band [1], the aim of our current study is to analyze the results obtained with the other GNSS frequency band: L2 and L5. L1 band seems to provide the best sea</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013CosRe..51..372V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013CosRe..51..372V"><span>On the nonlinear problem of the three-axis reorientation of a three-rotor gyrostat in the game <span class="hlt">noise</span> model</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vorotnikov, V. I.; Martyshenko, Yu. G.</p> <p>2013-09-01</p> <p>The nonlinear game problem of the three-axis reorientation of an asymmetric solid body with three flywheels (rotors) has been solved. <span class="hlt">Acceptable</span> <span class="hlt">levels</span> of uncontrollable <span class="hlt">noise</span> depending on given constraints of control moments have been estimated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20119488','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20119488"><span>Habitat-related birdsong divergence: a multi-<span class="hlt">level</span> study on the influence of territory density and ambient <span class="hlt">noise</span> in European blackbirds.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ripmeester, Erwin A P; Kok, Jet S; van Rijssel, Jacco C; Slabbekoorn, Hans</p> <p>2010-01-01</p> <p>Song plays an important role in avian communication and acoustic variation is important at both the individual and population <span class="hlt">level</span>. Habitat-related variation between populations in particular can reflect adaptations to the environment accumulated over generations, but this may not always be the case. In this study, we test whether variation between individuals matches local conditions with respect to <span class="hlt">noise</span> <span class="hlt">level</span> and territory density to examine whether short-term flexibility could contribute to song divergence at the population <span class="hlt">level</span>. We conducted a case study on an urban and forest population of the European blackbird and show divergence at the population <span class="hlt">level</span> (i.e. across habitats) in blackbird song, anthropogenic <span class="hlt">noise</span> <span class="hlt">level</span> and territory density. Unlike in several other species, we found a lack of any correlation at the individual <span class="hlt">level</span> (i.e. across individuals) between song features and ambient <span class="hlt">noise</span>. This suggests species-specific causal explanations for <span class="hlt">noise</span>-dependent song differentiation which are likely associated with variation in song-copying behaviour or feedback constraints related to variable singing styles. On the other hand, we found that at the <span class="hlt">level</span> of individual territories, temporal features, but not spectral ones, are correlated to territory density and seasonality. This suggests that short-term individual variation can indeed contribute to habitat-dependent divergence at the population <span class="hlt">level</span>. As this may undermine the potential role for song as a population marker, we conclude that more investigations on individual song flexibility are required for a better understanding of the impact of population-<span class="hlt">level</span> song divergence on hybridisation and speciation.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25080070','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25080070"><span>Replacing fish meal by food waste in feed pellets to culture lower trophic <span class="hlt">level</span> fish containing <span class="hlt">acceptable</span> <span class="hlt">levels</span> of organochlorine pesticides: health risk assessments.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cheng, Zhang; Mo, Wing-Yin; Man, Yu-Bon; Nie, Xiang-Ping; Li, Kai-Bing; Wong, Ming-Hung</p> <p>2014-12-01</p> <p>The present study used food waste (collected from local hotels and restaurants) feed pellets in polyculture of low-trophic <span class="hlt">level</span> fish [bighead (Aristichtys nobilis), grass carp (Ctenopharyngodon idellus), and mud carp (Cirrhina molitorella)] aiming at producing safe and quality products for local consumption. The results indicated that grass carp (hexachlorocyclohexanes (HCHs) <0.03; dichlorodiphenyltrichloroethanes (DDTs) 1.42-3.34 ng/g ww) and bighead carp (HCHs<0.03; DDTs 1.55-2.56 ng/g ww) fed with food waste feed pellets were relatively free of organochlorine pesticides (OCPs). The experimental ponds (water and sediment) were relatively free of OCPs, lowering the possibility of biomagnification of OCPs in the food chains within the ponds. The raw concentrations of OCPs extracted from the fish were not in the bioavailable form, which would ultimately reach bloodstream and exert adverse effects on human body. Health risk assessments based on digestible concentrations are commonly regarded as a more accurate method. The results of health risk assessments based on raw and digestible concentrations showed that the fish fed with food waste feed pellets were safe for consumption from the OCP perspective.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21556903','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21556903"><span>Effect of training data size and <span class="hlt">noise</span> <span class="hlt">level</span> on support vector machines virtual screening of genotoxic compounds from large compound libraries.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kumar, Pankaj; Ma, Xiaohua; Liu, Xianghui; Jia, Jia; Bucong, Han; Xue, Ying; Li, Ze Rong; Yang, Sheng Yong; Wei, Yu Quan; Chen, Yu Zong</p> <p>2011-05-01</p> <p>Various in vitro and in-silico methods have been used for drug genotoxicity tests, which show limited genotoxicity (GT+) and non-genotoxicity (GT-) identification rates. New methods and combinatorial approaches have been explored for enhanced collective identification capability. The rates of in-silco methods may be further improved by significantly diversified training data enriched by the large number of recently reported GT+ and GT- compounds, but a major concern is the increased <span class="hlt">noise</span> <span class="hlt">levels</span> arising from high false-positive rates of in vitro data. In this work, we evaluated the effect of training data size and <span class="hlt">noise</span> <span class="hlt">level</span> on the performance of support vector machines (SVM) method known to tolerate high <span class="hlt">noise</span> <span class="hlt">levels</span> in training data. Two SVMs of different diversity/<span class="hlt">noise</span> <span class="hlt">levels</span> were developed and tested. H-SVM trained by higher diversity higher <span class="hlt">noise</span> data (GT+ in any in vivo or in vitro test) outperforms L-SVM trained by lower <span class="hlt">noise</span> lower diversity data (GT+ in in vivo or Ames test only). H-SVM trained by 4,763 GT+ compounds reported before 2008 and 8,232 GT- compounds excluding clinical trial drugs correctly identified 81.6% of the 38 GT+ compounds reported since 2008, predicted 83.1% of the 2,008 clinical trial drugs as GT-, and 23.96% of 168 K MDDR and 27.23% of 17.86M PubChem compounds as GT+. These are comparable to the 43.1-51.9% GT+ and 75-93% GT- rates of existing in-silico methods, 58.8% GT+ and 79% GT- rates of Ames method, and the estimated percentages of 23% in vivo and 31-33% in vitro GT+ compounds in the "universe of chemicals". There is a substantial <span class="hlt">level</span> of agreement between H-SVM and L-SVM predicted GT+ and GT- MDDR compounds and the prediction from TOPKAT. SVM showed good potential in identifying GT+ compounds from large compound libraries based on higher diversity and higher <span class="hlt">noise</span> training data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011JCAMD..25..455K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011JCAMD..25..455K"><span>Effect of training data size and <span class="hlt">noise</span> <span class="hlt">level</span> on support vector machines virtual screening of genotoxic compounds from large compound libraries</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kumar, Pankaj; Ma, Xiaohua; Liu, Xianghui; Jia, Jia; Bucong, Han; Xue, Ying; Li, Ze Rong; Yang, Sheng Yong; Wei, Yu Quan; Chen, Yu Zong</p> <p>2011-05-01</p> <p>Various in vitro and in-silico methods have been used for drug genotoxicity tests, which show limited genotoxicity (GT+) and non-genotoxicity (GT-) identification rates. New methods and combinatorial approaches have been explored for enhanced collective identification capability. The rates of in-silco methods may be further improved by significantly diversified training data enriched by the large number of recently reported GT+ and GT- compounds, but a major concern is the increased <span class="hlt">noise</span> <span class="hlt">levels</span> arising from high false-positive rates of in vitro data. In this work, we evaluated the effect of training data size and <span class="hlt">noise</span> <span class="hlt">level</span> on the performance of support vector machines (SVM) method known to tolerate high <span class="hlt">noise</span> <span class="hlt">levels</span> in training data. Two SVMs of different diversity/<span class="hlt">noise</span> <span class="hlt">levels</span> were developed and tested. H-SVM trained by higher diversity higher <span class="hlt">noise</span> data (GT+ in any in vivo or in vitro test) outperforms L-SVM trained by lower <span class="hlt">noise</span> lower diversity data (GT+ in in vivo or Ames test only). H-SVM trained by 4,763 GT+ compounds reported before 2008 and 8,232 GT- compounds excluding clinical trial drugs correctly identified 81.6% of the 38 GT+ compounds reported since 2008, predicted 83.1% of the 2,008 clinical trial drugs as GT-, and 23.96% of 168 K MDDR and 27.23% of 17.86M PubChem compounds as GT+. These are comparable to the 43.1-51.9% GT+ and 75-93% GT- rates of existing in-silico methods, 58.8% GT+ and 79% GT- rates of Ames method, and the estimated percentages of 23% in vivo and 31-33% in vitro GT+ compounds in the "universe of chemicals". There is a substantial <span class="hlt">level</span> of agreement between H-SVM and L-SVM predicted GT+ and GT- MDDR compounds and the prediction from TOPKAT. SVM showed good potential in identifying GT+ compounds from large compound libraries based on higher diversity and higher <span class="hlt">noise</span> training data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26773971','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26773971"><span>Consumers' segmentation based on the <span class="hlt">acceptability</span> of meat from entire male pigs with different boar taint <span class="hlt">levels</span> in four European countries: France, Italy, Spain and United Kingdom.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Panella-Riera, N; Blanch, M; Kallas, Z; Chevillon, P; Garavaldi, A; Gil, M; Gil, J M; Font-i-Furnols, M; Oliver, M A</p> <p>2016-04-01</p> <p>Two consumer studies were conducted to know the <span class="hlt">acceptability</span> of pork with different boar taint <span class="hlt">levels</span>: test 1 performed in Spain (n=126) and United Kingdom (n=146), and test 2 performed in France (n=139) and Italy (n=140). Each test had 3 types of pork: 'Female meat', 'Low boar tainted meat', and a third type was 'Medium boar tainted meat' or 'High boar tainted meat'. Three main clusters were identified on the basis of 'How delicious do you find this meat?': 1-Pork lovers, 2-Boar meat lovers, 3-Reject boar tainted meat. Additionally, in test 2, a fourth cluster was identified: 'Reject low tainted meat'. A group of 16.2-38.2% of consumers rejected meat from boars, and another group of 12.4-21.7% rated the meat with medium or high <span class="hlt">levels</span> of boar taint better than the meat from females, identifying a niche for meat from medium and high <span class="hlt">levels</span> of boar taint, and suggesting the need to select carcasses on the basis of boar taint.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19740013195','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19740013195"><span>Effects of a traffic <span class="hlt">noise</span> background on judgements of aircraft <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Powell, C. A.; Rice, C. G.</p> <p>1974-01-01</p> <p>A study was conducted in which subjects judged aircraft <span class="hlt">noises</span> in the presence of road traffic background <span class="hlt">noise</span>. Two different techniques for presenting the background <span class="hlt">noises</span> were evaluated. For one technique, the background <span class="hlt">noise</span> was continuous over the whole of a test session. For the other, the background <span class="hlt">noise</span> was changed with each aircraft <span class="hlt">noise</span>. A range of aircraft <span class="hlt">noise</span> <span class="hlt">levels</span> and traffic <span class="hlt">noise</span> <span class="hlt">levels</span> were presented to simulate typical indoor <span class="hlt">levels</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/scitech/biblio/22224940','SCIGOV-STC'); return false;" href="https://www.osti.gov/scitech/biblio/22224940"><span>Development of a Performance and Processing Property <span class="hlt">Acceptance</span> Region for Cementitious Low-<span class="hlt">Level</span> Waste Forms at Savannah River Site - 13174</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Staub, Aaron V.; Reigel, Marissa M.</p> <p>2013-07-01</p> <p>The Saltstone Production and Disposal Facilities (SPF and SDF) at the Savannah River Site (SRS) have been treating decontaminated salt solution, a low-<span class="hlt">level</span> aqueous waste stream (LLW) since facility commissioning in 1990. In 2012, the Saltstone Facilities implemented a new Performance Assessment (PA) that incorporates an alternate design for the disposal facility to ensure that the performance objectives of DOE Order 435.1 and the National Defense Authorization Act (NDAA) of Fiscal Year 2005 Section 3116 are met. The PA performs long term modeling of the waste form, disposal facility, and disposal site hydrogeology to determine the transport history of radionuclides disposed in the LLW. Saltstone has been successfully used to dispose of LLW in a grout waste form for 15 years. Numerous waste form property assumptions directly impact the fate and transport modeling performed in the PA. The extent of process variability and consequence on performance properties are critical to meeting the assumptions of the PA. The SPF has ensured performance property <span class="hlt">acceptability</span> by way of implementing control strategies that ensure the process operates within the analyzed limits of variability, but efforts continue to improve the understanding of facility performance in relation to the PA analysis. A similar understanding of the impact of variability on processing parameters is important from the standpoint of the operability of the production facility. The fresh grout slurry properties (particularly slurry rheology and the rate of hydration and structure formation) of the waste form directly impact the pressure and flow rates that can be reliably processed. It is thus equally important to quantify the impact of variability on processing parameters to ensure that the design basis assumptions for the production facility are maintained. Savannah River Remediation (SRR) has been pursuing a process that will ultimately establish a property <span class="hlt">acceptance</span> region (PAR) to incorporate</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25267561','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25267561"><span><span class="hlt">Noise</span> effect on comfort in open-space offices: development of an assessment questionnaire.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pierrette, M; Parizet, E; Chevret, P; Chatillon, J</p> <p>2015-01-01</p> <p>It is currently <span class="hlt">accepted</span> that <span class="hlt">noise</span> is one of the most important annoyance factors in open-space offices. However, <span class="hlt">noise</span> <span class="hlt">levels</span> measured in open spaces of the tertiary sector rarely exceed 65 dB(A). It, therefore, appears necessary to develop a tool that can be used to assess the <span class="hlt">noise</span> environment of these offices and identify the parameters to be taken into consideration when assessing the <span class="hlt">noise</span> annoyance. This article presents a questionnaire to be filled by people working in such environment, and a case study in different open plan offices. The majority of the 237 respondents consider that the ambient <span class="hlt">noise</span> <span class="hlt">level</span> in their environment is high and that intelligible conversations between their colleagues represent the main source of <span class="hlt">noise</span> annoyance. This annoyance was significantly correlated with their evaluation of sound intensity, which could not be represented by A-weighted <span class="hlt">level</span> measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ASAJ..118R1856L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ASAJ..118R1856L"><span>Plumbing <span class="hlt">noise</span> in multifamily dwellings: 50 years and counting</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Loverde, John J.; Dong, David W.</p> <p>2005-09-01</p> <p>Historically, plumbing sound was only of concern in luxury buildings and plumbing <span class="hlt">noise</span> was rarely addressed explicitly in building codes or design guidelines. The last couple of decades have seen marked increases in population density, occupant expectations and sensitivity to <span class="hlt">noise</span>, and the number of <span class="hlt">noise</span>-related lawsuits. These demographic factors have considerably increased the importance of adequately addressing plumbing <span class="hlt">noise</span> in multifamily projects, as shown by the increasing number of published guidelines (such as in the latest ASHRAE Handbook). Over the course of our firm's history, we have attempted to determine the relationship between the sound <span class="hlt">level</span> from plumbing systems and the <span class="hlt">acceptability</span> to the occupants. Our current criteria for plumbing <span class="hlt">noise</span> and the reasoning behind them is discussed, including test cases and lawsuits, as well as the materials and methods available to meet those criteria, and their impact on the design of multifamily projects.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19810021384','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19810021384"><span>Comparison of predicted engine core <span class="hlt">noise</span> with current and proposed aircraft <span class="hlt">noise</span> certification requirements</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Vonglahn, U. H.; Groesbeck, D. E.</p> <p>1981-01-01</p> <p>Predicted engine core <span class="hlt">noise</span> <span class="hlt">levels</span> are compared with measured total aircraft <span class="hlt">noise</span> <span class="hlt">levels</span> and with current and proposed federal <span class="hlt">noise</span> certification requirements. Comparisons are made at the FAR-36 measuring stations and include consideration of both full- and cutback-power operation at takeoff. In general, core <span class="hlt">noise</span> provides a barrier to achieving proposed EPA stage 5 <span class="hlt">noise</span> <span class="hlt">levels</span> for all types of aircraft. More specifically, core <span class="hlt">noise</span> <span class="hlt">levels</span> will limit further reductions in aircraft <span class="hlt">noise</span> <span class="hlt">levels</span> for current widebody commercial aircraft.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1993STIN...9421756D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993STIN...9421756D"><span>The relative <span class="hlt">noise</span> <span class="hlt">levels</span> of parallel axis gear sets with various contact ratios and gear tooth forms</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Drago, Raymond J.; Lenski, Joseph W., Jr.; Spencer, Robert H.; Valco, Mark; Oswald, Fred B.</p> <p>1993-12-01</p> <p>The real <span class="hlt">noise</span> reduction benefits which may be obtained through the use of one gear tooth form as compared to another is an important design parameter for any geared system, especially for helicopters in which both weight and reliability are very important factors. This paper describes the design and testing of nine sets of gears which are as identical as possible except for their basic tooth geometry. <span class="hlt">Noise</span> measurements were made at various combinations of load and speed for each gear set so that direct comparisons could be made. The resultant data was analyzed so that valid conclusions could be drawn and interpreted for design use.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940017283','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940017283"><span>The relative <span class="hlt">noise</span> <span class="hlt">levels</span> of parallel axis gear sets with various contact ratios and gear tooth forms</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Drago, Raymond J.; Lenski, Joseph W., Jr.; Spencer, Robert H.; Valco, Mark; Oswald, Fred B.</p> <p>1993-01-01</p> <p>The real <span class="hlt">noise</span> reduction benefits which may be obtained through the use of one gear tooth form as compared to another is an important design parameter for any geared system, especially for helicopters in which both weight and reliability are very important factors. This paper describes the design and testing of nine sets of gears which are as identical as possible except for their basic tooth geometry. <span class="hlt">Noise</span> measurements were made at various combinations of load and speed for each gear set so that direct comparisons could be made. The resultant data was analyzed so that valid conclusions could be drawn and interpreted for design use.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840021593','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840021593"><span>Rotorcraft <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Huston, R. J. (Compiler)</p> <p>1982-01-01</p> <p>The establishment of a realistic plan for NASA and the U.S. helicopter industry to develop a design-for-<span class="hlt">noise</span> methodology, including plans for the identification and development of promising <span class="hlt">noise</span> reduction technology was discussed. Topics included: <span class="hlt">noise</span> reduction techniques, scaling laws, empirical <span class="hlt">noise</span> prediction, psychoacoustics, and methods of developing and validing <span class="hlt">noise</span> prediction methods.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPhCS.744a2189L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPhCS.744a2189L"><span>Active <span class="hlt">Noise</span> Control for Dishwasher <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lee, Nokhaeng; Park, Youngjin</p> <p>2016-09-01</p> <p>The dishwasher is a useful home appliance and continually used for automatically washing dishes. It's commonly placed in the kitchen with built-in style for practicality and better use of space. In this environment, people are easily exposed to dishwasher <span class="hlt">noise</span>, so it is an important issue for the consumers, especially for the people living in open and narrow space. Recently, the sound power <span class="hlt">levels</span> of the <span class="hlt">noise</span> are about 40 - 50 dBA. It could be achieved by removal of <span class="hlt">noise</span> sources and passive means of insulating acoustical path. For more reduction, such a quiet mode with the lower speed of cycle has been introduced, but this deteriorates the washing capacity. Under this background, we propose active <span class="hlt">noise</span> control for dishwasher <span class="hlt">noise</span>. It is observed that the <span class="hlt">noise</span> is propagating mainly from the lower part of the front side. Control speakers are placed in the part for the collocation. Observation part of estimating sound field distribution and control part of generating the anti-<span class="hlt">noise</span> are designed for active <span class="hlt">noise</span> control. Simulation result shows proposed active <span class="hlt">noise</span> control scheme could have a potential application for dishwasher <span class="hlt">noise</span> reduction.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12345479','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12345479"><span><span class="hlt">Acceptance</span> speech.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yusuf, C K</p> <p>1994-01-01</p> <p>I am proud and honored to <span class="hlt">accept</span> this award on behalf of the Government of Bangladesh, and the millions of Bangladeshi children saved by oral rehydration solution. The Government of Bangladesh is grateful for this recognition of its commitment to international health and population research and cost-effective health care for all. The Government of Bangladesh has already made remarkable strides forward in the health and population sector, and this was recognized in UNICEF's 1993 "State of the World's Children". The national contraceptive prevalence rate, at 40%, is higher than that of many developed countries. It is appropriate that Bangladesh, where ORS was discovered, has the largest ORS production capacity in the world. It was remarkable that after the devastating cyclone in 1991, the country was able to produce enough ORS to meet the needs and remain self-sufficient. Similarly, Bangladesh has one of the most effective, flexible and efficient control of diarrheal disease and epidemic response program in the world. Through the country, doctors have been trained in diarrheal disease management, and stores of ORS are maintained ready for any outbreak. Despite grim predictions after the 1991 cyclone and the 1993 floods, relatively few people died from diarrheal disease. This is indicative of the strength of the national program. I want to take this opportunity to acknowledge the contribution of ICDDR, B and the important role it plays in supporting the Government's efforts in the health and population sector. The partnership between the Government of Bangladesh and ICDDR, B has already borne great fruit, and I hope and believe that it will continue to do so for many years in the future. Thank you.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/1504863','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/1504863"><span>[Cardiovascular effects of <span class="hlt">noise</span>].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Vacheron, A</p> <p>1992-03-01</p> <p>The circulatory response to <span class="hlt">noise</span> is dominated by a peripheral blood vessels vasoconstriction, of greater magnitude when asleep than awake. <span class="hlt">Noise</span> of lower frequency seems more able to produce this response. With repetition of the <span class="hlt">noise</span>, adaptation and tolerance to it quickly appears. Meanwhile prolonged high <span class="hlt">level</span> <span class="hlt">noise</span> exposition induces an increasing prevalence of arterial hypertension among industrial workers. This increase is also clearly found in residential communities living near airports. Long-term exposure to <span class="hlt">noise</span> is a dangerous nuisance, that can lead to an increase in arterial blood pressure and favour coronary artery disease development.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1992cacn.agarQ....S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1992cacn.agarQ....S"><span>Combat aircraft <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sgarbozza, M.; Depitre, A.</p> <p>1992-04-01</p> <p>A discussion of the characteristics and the <span class="hlt">noise</span> <span class="hlt">levels</span> of combat aircraft and of a transport aircraft in taking off and landing are presented. Some methods of <span class="hlt">noise</span> reduction are discussed, including the following: operational anti-<span class="hlt">noise</span> procedures; and concepts of future engines (silent post-combustion and variable cycle). Some measurement results concerning the <span class="hlt">noise</span> generated in flight at great speeds and low altitude will also be examined. Finally, the protection of the environment of French air bases against <span class="hlt">noise</span> will be described and the possibilities of regulation examined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20160004680','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20160004680"><span>Perceived <span class="hlt">Noise</span> Analysis for Offset Jets Applied to Commercial Supersonic Aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Huff, Dennis L.; Henderson, Brenda S.; Berton, Jeffrey J.; Seidel, Jonathan A.</p> <p>2016-01-01</p> <p>A systems analysis was performed with experimental jet <span class="hlt">noise</span> data, engine/aircraft performance codes and aircraft <span class="hlt">noise</span> prediction codes to assess takeoff <span class="hlt">noise</span> <span class="hlt">levels</span> and mission range for conceptual supersonic commercial aircraft. A parametric study was done to identify viable engine cycles that meet NASA's N+2 goals for <span class="hlt">noise</span> and performance. Model scale data from offset jets were used as input to the aircraft <span class="hlt">noise</span> prediction code to determine the expected sound <span class="hlt">levels</span> for the lateral certification point where jet <span class="hlt">noise</span> dominates over all other <span class="hlt">noise</span> sources. The <span class="hlt">noise</span> predictions were used to determine the optimal orientation of the offset nozzles to minimize the <span class="hlt">noise</span> at the lateral microphone location. An alternative takeoff procedure called "programmed lapse rate" was evaluated for <span class="hlt">noise</span> reduction benefits. Results show there are two types of engines that provide <span class="hlt">acceptable</span> mission range performance; one is a conventional mixed-flow turbofan and the other is a three-stream variable-cycle engine. Separate flow offset nozzles reduce the <span class="hlt">noise</span> directed toward the thicker side of the outer flow stream, but have less benefit as the core nozzle pressure ratio is reduced. At the systems <span class="hlt">level</span> for a three-engine N+2 aircraft with full throttle takeoff, there is a 1.4 EPNdB margin to Chapter 3 <span class="hlt">noise</span> regulations predicted for the lateral certification point (assuming jet <span class="hlt">noise</span> dominates). With a 10% reduction in thrust just after clearing the runway, the margin increases to 5.5 EPNdB. Margins to Chapter 4 and Chapter 14 <span class="hlt">levels</span> will depend on the cumulative split between the three certification points, but it appears that low specific thrust engines with a 10% reduction in thrust (programmed lapse rate) can come close to meeting Chapter 14 <span class="hlt">noise</span> <span class="hlt">levels</span>. Further <span class="hlt">noise</span> reduction is possible with engine oversizing and derated takeoff, but more detailed mission studies are needed to investigate the range impacts as well as the practical limits for safety and takeoff</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26831958','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26831958"><span>Ultra-compact Watt-<span class="hlt">level</span> flat supercontinuum source pumped by <span class="hlt">noise</span>-like pulse from an all-fiber oscillator.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chen, He; Zhou, Xuanfeng; Chen, Sheng-Ping; Jiang, Zong-Fu; Hou, Jing</p> <p>2015-12-28</p> <p>We demonstrate Watt-<span class="hlt">level</span> flat visible supercontinuum (SC) generation in photonic crystal fibers, which is directly pumped by broadband <span class="hlt">noise</span>-like pulses from an Yb-doped all-fiber oscillator. The novel SC generator is featured with elegant all-fiber-integrated architecture, high spectral flatness and high efficiency. Wide optical spectrum spanning from 500 nm to 2300 nm with 1.02 W optical power is obtained under the pump of 1.4 W <span class="hlt">noise</span>-like pulse. The flatness of the spectrum in the range of 700 nm~1600 nm is less than 5 dB (including the pump residue). The exceptional simplicity, economical efficiency and the comparable performances make the <span class="hlt">noise</span>-like pulse oscillator a competitive candidate to the widely used cascade amplified coherent pulse as the pump source of broadband SC. To the best of our knowledge, this is the first demonstration of SC generation which is directly pumped by an all-fiber <span class="hlt">noise</span>-like pulse oscillator.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/819806','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/819806"><span>Managing Electrochemical <span class="hlt">Noise</span> Data by Exception Application of an On Line EN Data Analysis Technique to Data From a High <span class="hlt">Level</span> Nuclear Waste Tank</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>EDGEMON, G.L.</p> <p>2003-11-13</p> <p>Electrochemical <span class="hlt">noise</span> has been used a t the Hanford Site for a number of years to monitor in real time for pitting corrosion and stress corrosion cracking (SCC) mechanisms in high <span class="hlt">level</span> nuclear waste tanks. Currently the monitoring technique has only been implemented on three of the 177 underground storage tanks on the site. Widespread implementation of the technique has been held back for of a number of reasons, including issues around managing the large volume of data associated with electrochemical <span class="hlt">noise</span> and the complexity of data analysis. Expert review of raw current and potential measurements is the primary form of data analysis currently used at the Hanford site. This paper demonstrates the application of an on-line data filtering and analysis technique that could allow data from field applications of electrochemical <span class="hlt">noise</span> to be managed by exception, transforming electrochemical <span class="hlt">noise</span> data into a process parameter and focusing data analysis efforts on the important data. Results of the analysis demonstrate a data compression rate of 95%; that is, only 5% of the data would require expert analysis if such a technique were implemented. It is also demonstrated that this technique is capable of identifying key periods where localized corrosion activity is apparent.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800020442','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800020442"><span>Disturbance caused by aircraft <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Josse, R.</p> <p>1980-01-01</p> <p><span class="hlt">Noise</span> pollution caused by the presence of airfields adjacent to residential areas is studied. <span class="hlt">Noise</span> effects on the sleep of residents near airports and the degree of the residents <span class="hlt">noise</span> tolerance are evaluated. What aircraft <span class="hlt">noises</span> are annoying and to what extent the annoyance varies with sound <span class="hlt">level</span> are discussed.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED082327.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED082327.pdf"><span>The Effect of Three <span class="hlt">Noise</span> <span class="hlt">Levels</span> on Task Attention and Performance in Reading and Math with Fifth and Sixth Grade Children.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Meyer, Jo Ann; Wurster, Stanley R.</p> <p></p> <p>For this study, a 5th and 6th grade team taught classroom of 66 children was chosen. Three equivalent groups of 22 children each were matched on the basis of a pretest in math. Each group was given a different <span class="hlt">noise</span> <span class="hlt">level</span> treatment: quiet (45-55 decibels), average (55-70 decibels), and noisy (75-90 decibels). A tape recording of actual classroom…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25194274','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25194274"><span>The impact of an urban park on air pollution and <span class="hlt">noise</span> <span class="hlt">levels</span> in the Mediterranean city of Tel-Aviv, Israel.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cohen, Pninit; Potchter, Oded; Schnell, Izhak</p> <p>2014-12-01</p> <p>This study examines the influence of urban parks on air quality and <span class="hlt">noise</span> in the city of Tel-Aviv, Israel, by investigation of an urban park, an urban square and a street canyon. Simultaneous monitoring of several air pollutants and <span class="hlt">noise</span> <span class="hlt">levels</span> were conducted. The results showed that urban parks can reduce NOx, CO and PM10 and increase O3 concentrations and that park's mitigation effect is greater at higher NOx and PM10 <span class="hlt">levels</span>. During extreme events, mean values of 413 ppb NOx and 80 μG/m3 PM10 were measured in the street while mean values of 89 ppb NOx and 24 μG/m3 PM10 were measured in the park. Whereas summer highest O3 values of 84 ppb were measured in the street, 94 ppb were measured in the park. The benefit of the urban park in reducing NOx and PM10 concentrations is more significant than the disadvantage of increased O3 <span class="hlt">levels</span>. Furthermore, urban parks can reduce <span class="hlt">noise</span> by ∼5 dB(A).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940009488','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940009488"><span>An evaluation of <span class="hlt">noise</span> and its effects on shuttle crewmembers during STS-50/USML-1</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Koros, Anton; Wheelwright, Charles; Adam, Susan</p> <p>1993-01-01</p> <p>High <span class="hlt">noise</span> <span class="hlt">levels</span> can lead to physiological, psychological, and performance effects in man, ranging from irritability, annoyance, and sleep interference to interference with verbal communication and fatigue, and to temporary or permanent threshold shift at more extreme <span class="hlt">levels</span>. The current study evaluated the acoustic environment of the STS50/USML-1 mission. The major objectives were to gain subjective assessments of the STS-50 <span class="hlt">noise</span> <span class="hlt">levels</span>, document impacts of <span class="hlt">noise</span> upon crewmember performance, collect inflight sound <span class="hlt">level</span> measurements, compare <span class="hlt">noise</span> <span class="hlt">levels</span> across missions, evaluate the current Shuttle acoustic criterion, and to make recommendations regarding <span class="hlt">noise</span> specifications for SSF and other long-duration manned space missions. Sound measurements indicated that background <span class="hlt">noise</span> <span class="hlt">levels</span> were 60, 64, and 61 A-weighted decibels, respectively, on the Orbiter middeck, flight deck, and Space lab. All <span class="hlt">levels</span> were rated <span class="hlt">acceptable</span>, with the Spacelab environment rated the most favorably. Sleep stations afforded attenuation from airborne <span class="hlt">noise</span> sources, although all crewmembers reported being awakened by crew activity on the middeck. Models of distance for <span class="hlt">acceptable</span> speech communications were generated, identifying situations of compromised verbal communications to be avoided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27352136','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27352136"><span>Forensic facial approximation assessment: can application of different average facial tissue depth data facilitate recognition and establish <span class="hlt">acceptable</span> <span class="hlt">level</span> of resemblance?</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Herrera, Lara Maria; Strapasson, Raíssa Ananda Paim; da Silva, Jorge Vicente Lopes; Melani, Rodolfo Francisco Haltenhoff</p> <p>2016-09-01</p> <p>Facial soft tissue thicknesses (FSTT) are important guidelines for modeling faces from skull. Amid so many FSTT data, Forensic artists have to make a subjective choice of a dataset that best meets their needs. This study investigated the performance of four FSTT datasets in the recognition and resemblance of Brazilian living individuals and the performance of assessors in recognizing people, according to sex and knowledge on Human Anatomy and Forensic Dentistry. Sixteen manual facial approximations (FAs) were constructed using three-dimensional (3D) prototypes of skulls (targets). The American method was chosen for the construction of the faces. One hundred and twenty participants evaluated all FAs by means of recognition and resemblance tests. This study showed higher proportions of recognition by FAs conducted with FSTT data from cadavers compared with those conducted with medical imaging data. Targets were also considered more similar to FAs conducted with FSTT data from cadavers. Nose and face shape, respectively, were considered the most similar regions to targets. The sex of assessors (male and female) and the knowledge on Human Anatomy and Forensic Dentistry did not play a determinant role to reach greater recognition rates. It was possible to conclude that FSTT data obtained from imaging may not facilitate recognition and establish <span class="hlt">acceptable</span> <span class="hlt">level</span> of resemblance. Grouping FSTT data by regions of the face, as proposed in this paper, may contribute to more accurate FAs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19900000108&hterms=Wind+turbine&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DWind%2Bturbine','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19900000108&hterms=Wind+turbine&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DWind%2Bturbine"><span>Predicting <span class="hlt">Noise</span> From Wind Turbines</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Grosveld, Ferdinand W.</p> <p>1990-01-01</p> <p>Computer program WINDY predicts broadband <span class="hlt">noise</span> spectra of horizontal-axis wind-turbine generators. Enables adequate assessment of impact of broadband wind-turbine <span class="hlt">noise</span>. Effects of turbulence, trailing-edge wakes, and bluntness taken into account. Program has practical application in design and siting of wind-turbine machines <span class="hlt">acceptable</span> to community. Written in GW-Basic.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/20414667','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/20414667"><span><span class="hlt">Accepting</span> space radiation risks.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Schimmerling, Walter</p> <p>2010-08-01</p> <p>The human exploration of space inevitably involves exposure to radiation. Associated with this exposure are multiple risks, i.e., probabilities that certain aspects of an astronaut's health or performance will be degraded. The management of these risks requires that such probabilities be accurately predicted, that the actual exposures be verified, and that comprehensive records be maintained. Implicit in these actions is the fact that, at some point, a decision has been made to <span class="hlt">accept</span> a certain <span class="hlt">level</span> of risk. This paper examines ethical and practical considerations involved in arriving at a determination that risks are <span class="hlt">acceptable</span>, roles that the parties involved may play, and obligations arising out of reliance on the informed consent paradigm seen as the basis for ethical radiation risk <span class="hlt">acceptance</span> in space.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/7045035','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/7045035"><span>Effect of turbine dental drill <span class="hlt">noise</span> on dentists' hearing.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Man, A; Neuman, H; Assif, D</p> <p>1982-04-01</p> <p>The effect of high-speed dental turbines on dentists' hearing was investigated. The two types of dental turbines used most commonly in the Tel Aviv area and their average time of daily use were established by means of questionnaires. The <span class="hlt">noise</span> pressure <span class="hlt">level</span> of these turbines at a distance of 30.0 cm was measured. Twenty subjects were exposed to the turbine <span class="hlt">noise</span> for a period equal to the average time of the drill's daily use. The <span class="hlt">noise</span> pressure <span class="hlt">levels</span> of the turbines were found to be nonhazardous by the <span class="hlt">accepted</span> damage-risk criteria. The temporary threshold shifts of the subjects exposed were nil or insignificant. It was concluded that the risk of damage to the dentist's hearing due to dental turbine <span class="hlt">noise</span> in the normal course of a working day is slight.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20150011048','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20150011048"><span>Status: Crewmember <span class="hlt">Noise</span> Exposures on the International Space Station</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Limardo-Rodriguez, Jose G.; Allen, Christopher S.; Danielson, Richard W.</p> <p>2015-01-01</p> <p>The International Space Station (ISS) provides a unique environment where crewmembers from the US and our international partners work and live for as long as 6 to 12 consecutive months. During these long-durations ISS missions, <span class="hlt">noise</span> exposures from onboard equipment are posing concerns for human factors and crewmember health risks, such as possible reductions in hearing sensitivity, disruptions of crew sleep, interference with speech intelligibility and voice communications, interference with crew task performance, and reduced alarm audibility. It is crucial to control acoustical <span class="hlt">noise</span> aboard ISS to <span class="hlt">acceptable</span> <span class="hlt">noise</span> exposure <span class="hlt">levels</span> during the work-time period, and to also provide a restful sleep environment during the sleep-time period. Acoustic dosimeter measurements, obtained when the crewmember wears the dosimeter for 24-hour periods, are conducted onboard ISS every 60 days and compared to ISS flight rules. NASA personnel then assess the acoustic environment to which the crewmembers are exposed, and provide recommendations for hearing protection device usage. The purpose of this paper is to provide an update on the status of ISS <span class="hlt">noise</span> exposure monitoring and hearing conservation strategies, as well as to summarize assessments of acoustic dosimeter data collected since the Increment 36 mission (April 2013). A description of the updated <span class="hlt">noise</span> <span class="hlt">level</span> constraints flight rule, as well as the <span class="hlt">Noise</span> Exposure Estimation Tool and the <span class="hlt">Noise</span> Hazard Inventory implementation for predicting crew <span class="hlt">noise</span> exposures and recommending to ISS crewmembers when hearing protection devices are required, will be described.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5343046','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5343046"><span>A Mixed-Methods Trial of Broad Band <span class="hlt">Noise</span> and Nature Sounds for Tinnitus Therapy: Group and Individual Responses Modeled under the Adaptation <span class="hlt">Level</span> Theory of Tinnitus</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Durai, Mithila; Searchfield, Grant D.</p> <p>2017-01-01</p> <p>Objectives: A randomized cross-over trial in 18 participants tested the hypothesis that nature sounds, with unpredictable temporal characteristics and high valence would yield greater improvement in tinnitus than constant, emotionally neutral broadband <span class="hlt">noise</span>. Study Design: The primary outcome measure was the Tinnitus Functional Index (TFI). Secondary measures were: loudness and annoyance ratings, loudness <span class="hlt">level</span> matches, minimum masking <span class="hlt">levels</span>, positive and negative emotionality, attention reaction and discrimination time, anxiety, depression and stress. Each sound was administered using MP3 players with earbuds for 8 continuous weeks, with a 3 week wash-out period before crossing over to the other treatment sound. Measurements were undertaken for each arm at sound fitting, 4 and 8 weeks after administration. Qualitative interviews were conducted at each of these appointments. Results: From a baseline TFI score of 41.3, sound therapy resulted in TFI scores at 8 weeks of 35.6; broadband <span class="hlt">noise</span> resulted in significantly greater reduction (8.2 points) after 8 weeks of sound therapy use than nature sounds (3.2 points). The positive effect of sound on tinnitus was supported by secondary outcome measures of tinnitus, emotion, attention, and psychological state, but not interviews. Tinnitus loudness <span class="hlt">level</span> match was higher for BBN at 8 weeks; while there was little change in loudness <span class="hlt">level</span> matches for nature sounds. There was no change in minimum masking <span class="hlt">levels</span> following sound therapy administration. Self-reported preference for one sound over another did not correlate with changes in tinnitus. Conclusions: Modeled under an adaptation <span class="hlt">level</span> theory framework of tinnitus perception, the results indicate that the introduction of broadband <span class="hlt">noise</span> shifts internal adaptation <span class="hlt">level</span> weighting away from the tinnitus signal, reducing tinnitus magnitude. Nature sounds may modify the affective components of tinnitus via a secondary, residual pathway, but this appears to be less important</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19920005566','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19920005566"><span>Jet <span class="hlt">Noise</span> Suppression</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gliebe, P. R.; Brausch, J. F.; Majjigi, R. K.; Lee, R.</p> <p>1991-01-01</p> <p>The objectives of this chapter are to review and summarize the jet <span class="hlt">noise</span> suppression technology, to provide a physical and theoretical model to explain the measured jet <span class="hlt">noise</span> suppression characteristics of different concepts, and to provide a set of guidelines for evolving jet <span class="hlt">noise</span> suppression designs. The underlying principle for all jet <span class="hlt">noise</span> suppression devices is to enhance rapid mixing (i.e., diffusion) of the jet plume by geometric and aerothermodynamic means. In the case of supersonic jets, the shock-cell broadband <span class="hlt">noise</span> reduction is effectively accomplished by the elimination or mitigation of the shock-cell structure. So far, the diffusion concepts have predominantly concentrated on jet momentum and energy (kinetic and thermal) diffusion, in that order, and have yielded better <span class="hlt">noise</span> reduction than the simple conical nozzles. A critical technology issue that needs resolution is the effect of flight on the <span class="hlt">noise</span> suppression potential of mechanical suppressor nozzles. A more thorough investigation of this mechanism is necessary for the successful development and design of an <span class="hlt">acceptable</span> <span class="hlt">noise</span> suppression device for future high-speed civil transports.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19880044398&hterms=metcalf&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dmetcalf','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19880044398&hterms=metcalf&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dmetcalf"><span>Structureborne <span class="hlt">noise</span> in aircraft</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Clevenson, S. A.; Metcalf, V. L.</p> <p>1987-01-01</p> <p>The amount of <span class="hlt">noise</span> reaching an aircraft's interior by structureborne paths, when high <span class="hlt">levels</span> of other <span class="hlt">noises</span> are present, involves the measurement of transfer functions between vibrating <span class="hlt">levels</span> on the wing and interior <span class="hlt">noise</span>. The magnitude of the structureborne <span class="hlt">noise</span> transfer function is established by exciting the aircraft with an electrodynamic shaker; a second transfer function is measured using the same sensor locations with the aircraft engines operating. Attention is given to the case of a twin-turboprop OV-10A aircraft; the resulting transfer function values at the discrete frequencies corresponding to the propeller blade passage frequency and its first four harmonics are tabulated and illustrated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110011338','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110011338"><span>Core <span class="hlt">Noise</span> - Increasing Importance</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hultgren, Lennart S.</p> <p>2011-01-01</p> <p>This presentation is a technical summary of and outlook for NASA-internal and NASA-sponsored external research on core (combustor and turbine) <span class="hlt">noise</span> funded by the Fundamental Aeronautics Program Subsonic Fixed Wing (SFW) Project. Sections of the presentation cover: the SFW system-<span class="hlt">level</span> <span class="hlt">noise</span> metrics for the 2015, 2020, and 2025 timeframes; turbofan design trends and their aeroacoustic implications; the emerging importance of core <span class="hlt">noise</span> and its relevance to the SFW Reduced-Perceived-<span class="hlt">Noise</span> Technical Challenge; and the current research activities in the core-<span class="hlt">noise</span> area, with additional details given about the development of a high-fidelity combustor-<span class="hlt">noise</span> prediction capability as well as activities supporting the development of improved reduced-order, physics-based models for combustor-<span class="hlt">noise</span> prediction. The need for benchmark data for validation of high-fidelity and modeling work and the value of a potential future diagnostic facility for testing of core-<span class="hlt">noise</span>-reduction concepts are indicated. The NASA Fundamental Aeronautics Program has the principal objective of overcoming today's national challenges in air transportation. The SFW Reduced-Perceived-<span class="hlt">Noise</span> Technical Challenge aims to develop concepts and technologies to dramatically reduce the perceived aircraft <span class="hlt">noise</span> outside of airport boundaries. This reduction of aircraft <span class="hlt">noise</span> is critical to enabling the anticipated large increase in future air traffic. <span class="hlt">Noise</span> generated in the jet engine core, by sources such as the compressor, combustor, and turbine, can be a significant contribution to the overall <span class="hlt">noise</span> signature at low-power conditions, typical of approach flight. At high engine power during takeoff, jet and fan <span class="hlt">noise</span> have traditionally dominated over core <span class="hlt">noise</span>. However, current design trends and expected technological advances in engine-cycle design as well as <span class="hlt">noise</span>-reduction methods are likely to reduce non-core <span class="hlt">noise</span> even at engine-power points higher than approach. In addition, future low-emission combustor</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120000844','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120000844"><span>Core <span class="hlt">Noise</span> Reduction</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hultgren, Lennart S.</p> <p>2011-01-01</p> <p>This presentation is a technical summary of and outlook for NASA-internal and NASA-sponsored external research on core (combustor and turbine) <span class="hlt">noise</span> funded by the Fundamental Aeronautics Program Subsonic Fixed Wing (SFW) Project. Sections of the presentation cover: the SFW system-<span class="hlt">level</span> <span class="hlt">noise</span> metrics for the 2015, 2020, and 2025 timeframes; turbofan design trends and their aeroacoustic implications; the emerging importance of core <span class="hlt">noise</span> and its relevance to the SFW Reduce-Perceived-<span class="hlt">Noise</span> Technical Challenge; and the current research activities in the core <span class="hlt">noise</span> area. Recent work1 on the turbine-transmission loss of combustor <span class="hlt">noise</span> is briefly described, two2,3 new NRA efforts in the core-<span class="hlt">noise</span> area are outlined, and an effort to develop CMC-based acoustic liners for broadband <span class="hlt">noise</span> reduction suitable for turbofan-core application is delineated. The NASA Fundamental Aeronautics Program has the principal objective of overcoming today's national challenges in air transportation. The reduction of aircraft <span class="hlt">noise</span> is critical to enabling the anticipated large increase in future air traffic. The Subsonic Fixed Wing Project's Reduce-Perceived-<span class="hlt">Noise</span> Technical Challenge aims to develop concepts and technologies to dramatically reduce the perceived aircraft <span class="hlt">noise</span> outside of airport boundaries.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016SPIE.9783E..1HR','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016SPIE.9783E..1HR"><span>On the analogy between pulse-pile-up in energy-sensitive, photon-counting detectors and <span class="hlt">level</span>-crossing of shot <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roessl, Ewald; Bartels, Matthias; Daerr, Heiner; Proksa, Roland</p> <p>2016-03-01</p> <p>Shot <span class="hlt">noise</span> processes are omnipresent in physics and many of their properties have been extensively studied in the past, including the particular problem of <span class="hlt">level</span> crossing of shot <span class="hlt">noise</span>. Energy-sensitive, photon-counting detectors using comparators to discriminate pulse-heights are currently heavily investigated for medical applications, e.g. for x-ray computed tomography and x-ray mammography. Surprisingly, no mention of the close relation between the two topics can be found in the literature on photon-counting detectors. In this paper, we point out the close analogy between <span class="hlt">level</span> crossing of shot <span class="hlt">noise</span> and the problem of determining count rates of photon- counting detectors subject to pulse pile-up. The latter is very relevant for obtaining precise forward models for photon-counting detectors operated under conditions of very high x-ray flux employed in clinical x-ray computed tomography. Although several attempts have been made to provide reasonably accurate, approximative models for the registered number of counts in x-ray detectors under conditions of high flux and arbitrary x-ray spectra, see, e.g., no exact, analytic solution is given in the literature for general continuous pulse shapes. In this paper we present such a solution for arbitrary response functions, x-ray spectra and continuous pulse shapes based on a result from the theory of <span class="hlt">level</span> crossing. We briefly outline the theory of <span class="hlt">level</span> crossing including the famous Rice theorem and translate from the language of <span class="hlt">level</span> crossing to the language of photon-counting detection.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19820023195','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19820023195"><span>Airport <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Pendley, R. E.</p> <p>1982-01-01</p> <p>The problem of airport <span class="hlt">noise</span> at several airports and air bases is detailed. Community reactions to the <span class="hlt">noise</span>, steps taken to reduce jet engine <span class="hlt">noise</span>, and the effect of airport use restrictions and curfews on air transportation are discussed. The adverse effect of changes in allowable operational <span class="hlt">noise</span> on airport safety and altenative means for reducing <span class="hlt">noise</span> pollution are considered. Community-airport relations and public relations are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800006956','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800006956"><span>Combustion <span class="hlt">noise</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Strahle, W. C.</p> <p>1977-01-01</p> <p>A review of the subject of combustion generated <span class="hlt">noise</span> is presented. Combustion <span class="hlt">noise</span> is an important <span class="hlt">noise</span> source in industrial furnaces and process heaters, turbopropulsion and gas turbine systems, flaring operations, Diesel engines, and rocket engines. The state-of-the-art in combustion <span class="hlt">noise</span> importance, understanding, prediction and scaling is presented for these systems. The fundamentals and available theories of combustion <span class="hlt">noise</span> are given. Controversies in the field are discussed and recommendations for future research are made.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1980JSV....68..281E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1980JSV....68..281E"><span><span class="hlt">Noise</span> zoning around airports in the Netherlands</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Evers, F. W. R.</p> <p>1980-01-01</p> <p>The situation in the Netherlands with respect to <span class="hlt">noise</span> abatement is dominated by a steadily increasing activity both at the political and the administrative <span class="hlt">level</span>. A new law with respect to the designation of <span class="hlt">noise</span> zones around existing and future airports and military airfields was enacted on 1 October 1978. A comprehensive new <span class="hlt">noise</span> nuisance act was signed by the Queen on 16 February 1979. Both laws were <span class="hlt">accepted</span> by Parliament unanimously. This article describes the new regulations with respect to <span class="hlt">noise</span> zoning around airports. To maintain the habitability of the environment around airports, a demarcation will be made between the interest of the people living there and those of aviation. A <span class="hlt">noise</span> zone will be designated outside which the <span class="hlt">noise</span> load from aircraft movements may not exceed a fixed maximum. Within this area, where a <span class="hlt">noise</span> load above the fixed maximum is allowed, planning and building design measures will have to be taken. Although the exclusion of new housing within the <span class="hlt">noise</span> zone is an essential element, the area will be used for other purposes by exchanging previously intended developments with those from areas outside the zone. The Minister in charge of physical planning will issue directives concerning the contents of local development plans and will indicate how such plans, once amended, should be put into effect. Termination of the use or habitation of existing buildings is possible as well as soundproofing of buildings. The costs of measures taken to prevent undesirable new developments and measures taken to improve the existing state of affairs are borne by the central government. But a charge has to be paid by the users of the airports to defray the costs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12678944','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12678944"><span><span class="hlt">Noise</span> Mapping and Annoyance.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Knauss, D.</p> <p>2002-01-01</p> <p>The EC has published a Green Paper on <span class="hlt">noise</span> policy in the EU and has issued a directive on the assessment and reduction of environmental <span class="hlt">noise</span>. This directive will make <span class="hlt">noise</span> mapping mandatory for cities with at least 250.000 inhabitants. Due to the development in computer technology it is possible to calculate <span class="hlt">noise</span> maps for large urban areas using the available data on buildings, ground profile, road and rail traffic. Examples for <span class="hlt">noise</span> mapping are Birmingham (GB), Linz (A) and various German cities. Based on <span class="hlt">noise</span> maps and empirical data on the correlation between annoyance and <span class="hlt">noise</span> <span class="hlt">levels</span> annoyance maps for different sources (rail, road, aircraft) can be calculated. Under the assumption that the annoyance for the different sources are only weakly correlated, a combined annoyance map can be calculated. In a second step using the distribution of the population the actual number of annoyed people can be evaluated. This analysis can be used, for example, to identify <span class="hlt">noise</span> hot spots and to assess the impact of major traffic projects - roads, airports- on the <span class="hlt">noise</span> situation as well as the impact on the population. Furthermore, the combined annoyance maps can be used to investigate on health effects and to check whether or not empirical correlations between annoyance and <span class="hlt">noise</span> <span class="hlt">levels</span> are sufficiently correct.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1472373','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1472373"><span>Elimination of Escherichia coli O157:H7 from Fermented Dry Sausages at an Organoleptically <span class="hlt">Acceptable</span> <span class="hlt">Level</span> of Microencapsulated Allyl Isothiocyanate</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Chacon, Pedro A.; Muthukumarasamy, Parthiban; Holley, Richard A.</p> <p>2006-01-01</p> <p>Four sausage batters (17.59% beef, 60.67% pork, and 17.59% pork fat) were inoculated with two commercial starter culture organisms (>7 log10 CFU/g Pediococcus pentosaceus and 6 log10 CFU/g Staphylococcus carnosus) and a five-strain cocktail of nonpathogenic variants of Escherichia coli O157:H7 to yield 6 to 7 log10 CFU/g. Microencapsulated allyl isothiocyanate (AIT) was added to three batters at 500, 750, or 1,000 ppm to determine its antimicrobial effects. For sensory analysis, separate batches with starter cultures and 0, 500, or 750 ppm microencapsulated AIT were produced. Sausages were fermented at ≤26°C and 88% relative humidity (RH) for 72 h. Subsequently sausages were dried at 75% RH and 13°C for at least 25 days. The water activity (aw), pH, and <span class="hlt">levels</span> of starter cultures, E. coli O157:H7, and total bacteria were monitored during fermentation and drying. All sausages showed changes in the initial pH from 5.57 to 4.89 and in aw from 0.96 to 0.89 by the end of fermentation and drying, respectively. Starter culture numbers were reduced during sausage maturation, but there was no effect of AIT on meat pH reduction. E. coli O157:H7 was reduced by 6.5 log10 CFU/g in sausages containing 750 and 1,000 ppm AIT after 21 and 16 days of processing, respectively. E. coli O157:H7 numbers were reduced by 4.75 log10 CFU/g after 28 days of processing in treatments with 500 ppm AIT, and the organism was not recovered from this treatment beyond 40 days. During sensory evaluation, sausages containing 500 ppm AIT were considered <span class="hlt">acceptable</span> although slightly spicy by panelists. PMID:16672446</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1993EnMan..17..187R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993EnMan..17..187R"><span>Defining <span class="hlt">acceptable</span> conditions in wilderness</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roggenbuck, J. W.; Williams, D. R.; Watson, A. E.</p> <p>1993-03-01</p> <p>The limits of <span class="hlt">acceptable</span> change (LAC) planning framework recognizes that forest managers must decide what indicators of wilderness conditions best represent resource naturalness and high-quality visitor experiences and how much change from the pristine is <span class="hlt">acceptable</span> for each indicator. Visitor opinions on the aspects of the wilderness that have great impact on their experience can provide valuable input to selection of indicators. Cohutta, Georgia; Caney Creek, Arkansas; Upland Island, Texas; and Rattlesnake, Montana, wilderness visitors have high shared agreement that littering and damage to trees in campsites, <span class="hlt">noise</span>, and seeing wildlife are very important influences on wilderness experiences. Camping within sight or sound of other people influences experience quality more than do encounters on the trails. Visitors’ standards of <span class="hlt">acceptable</span> conditions within wilderness vary considerably, suggesting a potential need to manage different zones within wilderness for different clientele groups and experiences. Standards across wildernesses, however, are remarkably similar.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_25 --> <center> <div class="footer-extlink text-muted"><small>Some links on this page may take you to non-federal websites. 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