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Sample records for air conduction hearing

  1. 21 CFR 874.3950 - Transcutaneous air conduction hearing aid system.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3950... occluding the ear canal. The device consists of an air conduction hearing aid attached to a surgically... ear canal. (b) Classification. Class II (special controls). The special control for this device is...

  2. 21 CFR 874.3950 - Transcutaneous air conduction hearing aid system.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3950... occluding the ear canal. The device consists of an air conduction hearing aid attached to a surgically... ear canal. (b) Classification. Class II (special controls). The special control for this device is...

  3. 21 CFR 874.3950 - Transcutaneous air conduction hearing aid system.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3950... occluding the ear canal. The device consists of an air conduction hearing aid attached to a surgically... ear canal. (b) Classification. Class II (special controls). The special control for this device is...

  4. 21 CFR 874.3305 - Wireless air-conduction hearing aid.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 8 2012-04-01 2012-04-01 false Wireless air-conduction hearing aid. 874.3305 Section 874.3305 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3305 Wireless...

  5. 21 CFR 874.3950 - Transcutaneous air conduction hearing aid system.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3950... occluding the ear canal. The device consists of an air conduction hearing aid attached to a surgically... ear canal. (b) Classification. Class II (special controls). The special control for this device is...

  6. 21 CFR 874.3305 - Wireless air-conduction hearing aid.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 8 2013-04-01 2013-04-01 false Wireless air-conduction hearing aid. 874.3305 Section 874.3305 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3305 Wireless...

  7. 21 CFR 874.3305 - Wireless air-conduction hearing aid.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Wireless air-conduction hearing aid. 874.3305 Section 874.3305 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3305 Wireless...

  8. 21 CFR 874.3950 - Transcutaneous air conduction hearing aid system.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... SERVICES (CONTINUED) MEDICAL DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3950... occluding the ear canal. The device consists of an air conduction hearing aid attached to a surgically... ear canal. (b) Classification. Class II (special controls). The special control for this device is...

  9. Fluid stimulation elicits hearing in the absence of air and bone conduction-An animal study.

    PubMed

    Perez, Ronen; Adelman, Cahtia; Sohmer, Haim

    2016-04-01

    Conclusion Cochlea can be directly excited by fluid (soft-tissue) stimulation. Objective To determine whether there is no difference in auditory-nerve-brainstem evoked response (ABR) thresholds to fluid stimulation between normal and animal models of post radical-mastoidectomy, as seen in a previous human study. Background It has been shown in humans that hearing can be elicited with stimulation to fluid in the external auditory meatus (EAM), and radical-mastoidectomy cavity. These groups differed in age, initial hearing, and drilling exposure. To overcome this difference, experiments were conducted in sand-rats, first intact, and after inducing a radical-mastoidectomy. Methods The EAM of five sand-rats was filled with 0.3 ml saline. ABR thresholds were determined in response to vibratory stimulation by a clinical bone-vibrator with a plastic rod, applied to the saline in the EAM. Then the tympanic membrane was removed, and malleus dislocated (radical-mastoidectomy model). The cavity was filled with 0.45 ml saline and the ABR threshold was determined in response to vibratory stimulation to the cavity fluid. Results There was no difference in ABR fluid thresholds to EAM and mastoidectomy cavity stimulation. Air-conduction stimulation from the bone-vibrator was not involved (conductive loss due to fluid). Bone-conduction stimulation was not involved (large difference in acoustic impedance between fluid and bone). PMID:26824146

  10. Cartilage conduction hearing.

    PubMed

    Shimokura, Ryota; Hosoi, Hiroshi; Nishimura, Tadashi; Yamanaka, Toshiaki; Levitt, Harry

    2014-04-01

    Sound information is known to travel to the cochlea via either air or bone conduction. However, a vibration signal, delivered to the aural cartilage via a transducer, can also produce a clearly audible sound. This type of conduction has been termed "cartilage conduction." The aural cartilage forms the outer ear and is distributed around the exterior half of the external auditory canal. In cartilage conduction, the cartilage and transducer play the roles of a diaphragm and voice coil of a loudspeaker, respectively. There is a large gap between the impedances of cartilage and skull bone, such that cartilage vibrations are not easily transmitted through bone. Thus, these methods of conduction are distinct. In this study, force was used to apply a transducer to aural cartilage, and it was found that the sound in the auditory canal was amplified, especially for frequencies below 2 kHz. This effect was most pronounced at an application force of 1 N, which is low enough to ensure comfort in the design of hearing aids. The possibility of using force adjustments to vary amplification may also have applications for cell phone design. PMID:25234994

  11. Medical devices; ear, nose, and throat devices; classification of the transcutaneous air conduction hearing aid system. Final rule.

    PubMed

    2002-11-01

    The Food and Drug Administration (FDA) is classifying the transcutaneous air conduction hearing aid system (TACHAS) into class II (special controls). Elsewhere in this issue of the Federal Register, FDA is announcing the availability of a guidance document that will serve as the special control for the device. The agency is taking this action in response to a petition submitted under the Federal Food, Drug, and Cosmetic Act (the act) as amended by the Medical Device Amendments of 1976 (the amendments), the Safe Medical Devices Act of 1990, and the Food and Drug Administration Modernization Act of 1997 (FDAMA). The agency is classifying this device into class II (special controls) in order to provide a reasonable assurance of safety and effectiveness of the device. PMID:12422884

  12. 77 FR 1513 - Air Show and Air Races; Public Hearing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-10

    ... From the Federal Register Online via the Government Publishing Office NATIONAL TRANSPORTATION SAFETY BOARD Air Show and Air Races; Public Hearing TIME AND DATE: 9 a.m., Tuesday, January 10, 2012... hearing is to examine current regulations and oversight practices for air shows and air races,...

  13. 42 CFR 422.1046 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Conduct of hearing. 422.1046 Section 422.1046....1046 Conduct of hearing. (a) Participants in the hearing. The hearing is open to the parties and their... parties are presented and the conduct of the hearing. (4) CMS has the burden of coming forward...

  14. 42 CFR 423.1046 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Conduct of hearing. 423.1046 Section 423.1046... Penalties § 423.1046 Conduct of hearing. (a) Participants in the hearing. The hearing is open to the parties... the parties are presented and the conduct of the hearing. (4) CMS has the burden of coming...

  15. 12 CFR 508.7 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 508.7 Conduct of hearings. (a) Hearings provided by this... Enforcement, the record shall remain open for a period of 5 business days following the hearing, during...

  16. 33 CFR 52.56 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Conduct of hearing. 52.56 Section... FOR CORRECTION OF MILITARY RECORDS OF THE COAST GUARD Hearings § 52.56 Conduct of hearing. (a) The Chair or the Chair's designee shall conduct a hearing so as to ensure a full and fair presentation...

  17. 24 CFR 180.605 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Conduct of hearings. 180.605 Section 180.605 Housing and Urban Development Regulations Relating to Housing and Urban Development OFFICE... Hearing § 180.605 Conduct of hearings. The hearing shall be conducted in accordance with...

  18. How to Conduct an Administrative Hearing.

    ERIC Educational Resources Information Center

    Bittle, Edgar H.

    Chapter 18 of a book on school law summarizes court decisions that have established the responsibility of school officials, when taking disciplinary action, to conduct hearings to protect employees' and students' due process rights. The courts have used a balancing test to determine whether a trial procedure or a more informal procedure can be…

  19. 38 CFR 17.68 - Notice and conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... MEDICAL Community Residential Care § 17.68 Notice and conduct of hearing. (a) Upon receipt of a request for an oral hearing, the hearing official shall: (1) Notify the community residential care facility operator of the date, time, and location for the hearing; and (2) Notify the community residential...

  20. 38 CFR 17.68 - Notice and conduct of hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... MEDICAL Community Residential Care § 17.68 Notice and conduct of hearing. (a) Upon receipt of a request for an oral hearing, the hearing official shall: (1) Notify the community residential care facility operator of the date, time, and location for the hearing; and (2) Notify the community residential...

  1. 22 CFR 401.7 - Conduct of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 22 Foreign Relations 2 2011-04-01 2009-04-01 true Conduct of hearings. 401.7 Section 401.7 Foreign Relations INTERNATIONAL JOINT COMMISSION, UNITED STATES AND CANADA RULES OF PROCEDURE General § 401.7 Conduct of hearings. Hearings may be conducted, testimony received and arguments thereon heard by...

  2. 22 CFR 401.7 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 22 Foreign Relations 2 2010-04-01 2010-04-01 true Conduct of hearings. 401.7 Section 401.7 Foreign Relations INTERNATIONAL JOINT COMMISSION, UNITED STATES AND CANADA RULES OF PROCEDURE General § 401.7 Conduct of hearings. Hearings may be conducted, testimony received and arguments thereon heard by...

  3. 34 CFR 34.13 - Conduct of a hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false Conduct of a hearing. 34.13 Section 34.13 Education Office of the Secretary, Department of Education ADMINISTRATIVE WAGE GARNISHMENT § 34.13 Conduct of a...) The hearing official conducts any hearing as an informal proceeding. (2) A witness in an oral...

  4. 12 CFR 508.7 - Conduct of hearings.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 12 Banks and Banking 6 2012-01-01 2012-01-01 false Conduct of hearings. 508.7 Section 508.7 Banks and Banking OFFICE OF THRIFT SUPERVISION, DEPARTMENT OF THE TREASURY REMOVALS, SUSPENSIONS, AND PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 508.7 Conduct of hearings. (a) Hearings provided by...

  5. 12 CFR 508.7 - Conduct of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 12 Banks and Banking 5 2011-01-01 2011-01-01 false Conduct of hearings. 508.7 Section 508.7 Banks and Banking OFFICE OF THRIFT SUPERVISION, DEPARTMENT OF THE TREASURY REMOVALS, SUSPENSIONS, AND PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 508.7 Conduct of hearings. (a) Hearings provided by...

  6. 12 CFR 108.7 - Conduct of hearings.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 12 Banks and Banking 1 2012-01-01 2012-01-01 false Conduct of hearings. 108.7 Section 108.7 Banks and Banking COMPTROLLER OF THE CURRENCY, DEPARTMENT OF THE TREASURY REMOVALS, SUSPENSIONS, AND PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 108.7 Conduct of hearings. (a) Hearings provided by...

  7. 12 CFR 108.7 - Conduct of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 12 Banks and Banking 1 2014-01-01 2014-01-01 false Conduct of hearings. 108.7 Section 108.7 Banks and Banking COMPTROLLER OF THE CURRENCY, DEPARTMENT OF THE TREASURY REMOVALS, SUSPENSIONS, AND PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 108.7 Conduct of hearings. (a) Hearings provided by...

  8. 12 CFR 508.7 - Conduct of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 12 Banks and Banking 6 2014-01-01 2012-01-01 true Conduct of hearings. 508.7 Section 508.7 Banks and Banking OFFICE OF THRIFT SUPERVISION, DEPARTMENT OF THE TREASURY REMOVALS, SUSPENSIONS, AND PROHIBITIONS WHERE A CRIME IS CHARGED OR PROVEN § 508.7 Conduct of hearings. (a) Hearings provided by...

  9. 31 CFR 501.718 - Conduct and order of hearings.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 31 Money and Finance:Treasury 3 2012-07-01 2012-07-01 false Conduct and order of hearings. 501.718 Section 501.718 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) OFFICE... Trading With the Enemy Act (TWEA) Penalties § 501.718 Conduct and order of hearings. All hearings shall...

  10. 31 CFR 501.718 - Conduct and order of hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 31 Money and Finance:Treasury 3 2013-07-01 2013-07-01 false Conduct and order of hearings. 501.718 Section 501.718 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) OFFICE... Trading With the Enemy Act (TWEA) Penalties § 501.718 Conduct and order of hearings. All hearings shall...

  11. 31 CFR 501.718 - Conduct and order of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 31 Money and Finance:Treasury 3 2011-07-01 2011-07-01 false Conduct and order of hearings. 501.718 Section 501.718 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) OFFICE... Trading With the Enemy Act (TWEA) Penalties § 501.718 Conduct and order of hearings. All hearings shall...

  12. 31 CFR 501.718 - Conduct and order of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 31 Money and Finance:Treasury 3 2014-07-01 2014-07-01 false Conduct and order of hearings. 501.718 Section 501.718 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) OFFICE... Trading With the Enemy Act (TWEA) Penalties § 501.718 Conduct and order of hearings. All hearings shall...

  13. 42 CFR 423.658 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Conduct of hearing. 423.658 Section 423.658 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED... § 423.658 Conduct of hearing. (a) The hearing is open to the parties and to the public. (b) The...

  14. 20 CFR 30.314 - How is a hearing conducted?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... will try to set the hearing at a place that is within commuting distance of the claimant's residence... rules of procedure. The reviewer may conduct the hearing in such manner as to best ascertain the...

  15. 20 CFR 30.314 - How is a hearing conducted?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... will try to set the hearing at a place that is within commuting distance of the claimant's residence... rules of procedure. The reviewer may conduct the hearing in such manner as to best ascertain the...

  16. 46 CFR 201.132 - Conduct of the hearing.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... PROCEDURE Hearing Procedures (Rule 13) § 201.132 Conduct of the hearing. (a) Order of presentation. Normally the order of presentation at the hearing will be alphabetical in each of the following categories: (1...) Oral motions. Oral presentation on any motion or objection shall be limited to the party or...

  17. 44 CFR 68.7 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 44 Emergency Management and Assistance 1 2010-10-01 2010-10-01 false Conduct of hearings. 68.7... PROCEDURES § 68.7 Conduct of hearings. (a) The Judge shall be responsible for the fair and expeditious conduct of proceedings. (b) The Federal Insurance Administrator shall be represented by the Chief...

  18. 45 CFR 1303.16 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... are prohibited as provided by 45 CFR 16.17. (c) Both ACYF and the grantee are entitled to present... 45 Public Welfare 4 2010-10-01 2010-10-01 false Conduct of hearing. 1303.16 Section 1303.16 Public... Grantees § 1303.16 Conduct of hearing. (a) The presiding officer shall conduct a full and fair...

  19. Bone conduction hearing in congenital aural atresia.

    PubMed

    Zhang, Lichun; Gao, Na; Yin, Yanbo; Yang, Lin; Xie, Youzhou; Chen, Ying; Dai, Peidong; Zhang, Tianyu

    2016-07-01

    Previous researches focusing on BC hearing mechanisms proved that the two routes, (1) EAC sound radiation and (2) inertial of ossicular chain, partially contribute to normal BC hearing. Therefore, the BC hearing for those patients with congenital aural atresia should partially decrease theoretically due to their abnormal anatomy. However, there are not many studies which mention these patients' BC hearing up till now. The objective of this study is to investigate congenital aural atresia patient's BC hearing by analysis of pre-surgical audiogram and to study their potential BC hearing mechanisms using animal modeling and their ABR measurements. The study methoed involves analyzing 75 patients' pre-operative audiogram. Then we produced an animal model by surgery to measure their BC hearing threshold changes. Clinical data showed that those patients had some BC hearing loss; and there were 25 cases (25/75, 33.3 %) which present with typical Carhart's Notch. The animal experiments proved that inertia of ossicular chain contribute to partial BC hearing, which demonstrated that the inertia produced more affects on high frequencies by comparing with low frequencies. The patients with congenital aural atresia present BC hearing loss, which could be mainly ascribed to the absence of inertia of ossicular chain. PMID:26205153

  20. 10 CFR 708.28 - What procedures govern a hearing conducted by the Office of Hearings and Appeals?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 4 2011-01-01 2011-01-01 false What procedures govern a hearing conducted by the Office of Hearings and Appeals? 708.28 Section 708.28 Energy DEPARTMENT OF ENERGY DOE CONTRACTOR EMPLOYEE PROTECTION PROGRAM Investigation, Hearing and Decision Process § 708.28 What procedures govern a hearing conducted by the Office of Hearings and...

  1. 31 CFR 501.718 - Conduct and order of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Conduct and order of hearings. 501.718 Section 501.718 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued... REGULATIONS Trading With the Enemy Act (TWEA) Penalties § 501.718 Conduct and order of hearings. All...

  2. 28 CFR 76.32 - Hearing room conduct.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 2 2010-07-01 2010-07-01 false Hearing room conduct. 76.32 Section 76.32 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) RULES OF PROCEDURE FOR ASSESSMENT OF CIVIL PENALTIES FOR POSSESSION OF CERTAIN CONTROLLED SUBSTANCES § 76.32 Hearing room conduct. Proceedings shall...

  3. 25 CFR 577.7 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... accordance with 25 CFR part 571, subpart C) among the parties when to do so would expedite the proceeding; (5... 25 Indians 2 2010-04-01 2010-04-01 false Conduct of hearing. 577.7 Section 577.7 Indians NATIONAL... THE COMMISSION § 577.7 Conduct of hearing. (a) Once designated by the Commission, the...

  4. 20 CFR 404.1682 - Who conducts the hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 20 Employees' Benefits 2 2010-04-01 2010-04-01 false Who conducts the hearings. 404.1682 Section 404.1682 Employees' Benefits SOCIAL SECURITY ADMINISTRATION FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950- ) Determinations of Disability Hearings and Appeals § 404.1682 Who conducts the...

  5. 20 CFR 416.1082 - Who conducts the hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 20 Employees' Benefits 2 2010-04-01 2010-04-01 false Who conducts the hearings. 416.1082 Section 416.1082 Employees' Benefits SOCIAL SECURITY ADMINISTRATION SUPPLEMENTAL SECURITY INCOME FOR THE AGED, BLIND, AND DISABLED Determinations of Disability Hearings and Appeals § 416.1082 Who conducts...

  6. 29 CFR 101.30 - Formal hearing and procedure respecting election conducted after hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Formal hearing and procedure respecting election conducted... and procedure respecting election conducted after hearing. (a) The procedures are the same as those described in subpart C of the Statements of Procedure respecting representation cases arising under...

  7. 5 CFR 1501.13 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ....13 Administrative Personnel THE INTERNATIONAL ORGANIZATIONS EMPLOYEES LOYALTY BOARD OPERATIONS OF THE INTERNATIONAL ORGANIZATIONS EMPLOYEES LOYALTY BOARD § 1501.13 Conduct of hearings. (a) Not less than three... the panel shall preside and be responsible for the maintenance of decorum and order in the hearing....

  8. 5 CFR 1501.13 - Conduct of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ....13 Administrative Personnel THE INTERNATIONAL ORGANIZATIONS EMPLOYEES LOYALTY BOARD OPERATIONS OF THE INTERNATIONAL ORGANIZATIONS EMPLOYEES LOYALTY BOARD § 1501.13 Conduct of hearings. (a) Not less than three... the panel shall preside and be responsible for the maintenance of decorum and order in the hearing....

  9. 10 CFR 824.12 - Conduct of the hearing.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... DEPARTMENT OF ENERGY PROCEDURAL RULES FOR THE ASSESSMENT OF CIVIL PENALTIES FOR CLASSIFIED INFORMATION SECURITY VIOLATIONS § 824.12 Conduct of the hearing. (a) DOE shall make a transcript of the hearing; (b... unauthorized disclosure of classified information or any other information protected from public disclosure...

  10. Air and Bone Conduction Thresholds of Deaf and Normal Hearing Subjects before and during the Elimination of Cutaneous-Tactile Interference with Anesthesia. Final Report.

    ERIC Educational Resources Information Center

    Nober, E. Harris

    The study investigated whether low frequency air and bone thresholds elicited at high intensity levels from deaf children with a sensory-neural diagnosis reflect valid auditory sensitivity or are mediated through cutaneous-tactile receptors. Subjects were five totally deaf (mean age 17.0) yielding vibrotactile thresholds but with no air and bone…

  11. Measuring In-Air and Underwater Hearing in Seabirds.

    PubMed

    Crowell, Sara C

    2016-01-01

    Electrophysiological methods were used to measure the in-air hearing of 10 species of seabirds. There are currently no measures of the underwater hearing abilities of diving birds. In preparation for constructing a behavioral audiogram both in-air and underwater hearing, several species of diving ducks were raised. Because there is a considerable amount of literature on bird hearing in air, the technical setup and training methods were modeled on similar studies, with modifications to address the nature of the underwater sound field and the difficulty of the task for the birds. PMID:26611081

  12. Audiological results with Baha in conductive and mixed hearing loss.

    PubMed

    Pfiffner, Flurin; Caversaccio, Marco-Domenico; Kompis, Martin

    2011-01-01

    The level of improvement in the audiological results of Baha(®) users mainly depends on the patient's preoperative hearing thresholds and the type of Baha sound processor used. This investigation shows correlations between the preoperative hearing threshold and postoperative aided thresholds and audiological results in speech understanding in quiet of 84 Baha users with unilateral conductive hearing loss, bilateral conductive hearing loss and bilateral mixed hearing loss. Secondly, speech understanding in noise of 26 Baha users with different Baha sound processors (Compact, Divino, and BP100) is investigated. Linear regression between aided sound field thresholds and bone conduction (BC) thresholds of the better ear shows highest correlation coefficients and the steepest slope. Differences between better BC thresholds and aided sound field thresholds are smallest for mid-frequencies (1 and 2 kHz) and become larger at 0.5 and 4 kHz. For Baha users, the gain in speech recognition in quiet can be expected to lie in the order of magnitude of the gain in their hearing threshold. Compared to its predecessor sound processors Baha(®) Compact and Baha(®) Divino, Baha(®) BP100 improves speech understanding in noise significantly by +0.9 to +4.6 dB signal-to-noise ratio, depending on the setting and the use of directional microphone. For Baha users with unilateral and bilateral conductive hearing loss and bilateral mixed hearing loss, audiological results in aided sound field thresholds can be estimated with the better BC hearing threshold. The benefit in speech understanding in quiet can be expected to be similar to the gain in their sound field hearing threshold. The most recent technology of Baha sound processor improves speech understanding in noise by an order of magnitude that is well perceived by users and which can be very useful in everyday life. PMID:21389707

  13. A possible third window for bone conducted hearing: Cochlear aqueduct vs. vestibular aqueduct

    NASA Astrophysics Data System (ADS)

    Kim, Namkeun; Stenfelt, Stefan

    2015-12-01

    A third window, which is another cochlear fluid pathway different from the oval window and round window, is considered to be a significant factor in bone-conducted hearing. A three-dimensional finite element model of the human ear consisting of the middle ear and cochlea was used to investigate the effect of the third windows on bone-conducted heraing. This study is aimed to find the third window which causes the consistent cochlear responses with previous studies in air-conducted hearing, and causes the asymmetry of the volume velocity ratio between the oval window and round window in bone-conducted hearing. The preliminary result shows that the cochlear aqueduct and the vestibular aqueduct with high impedance do not affect the basilar membrane velocity in air-conducted hearing. On the contrary, in bone-conducted hearing, the direction of the shaking structure for the bone-conducted stimulation as well as the third window can be a significant factor causing the asymmetry of the volume velocity ratio found by Stenfelt et al.

  14. 30 CFR 1241.72 - How will the Office of Hearings and Appeals conduct the hearing on the record?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Oil and Gas Leases General Provisions § 1241.72 How will the Office of Hearings and Appeals conduct... or 1241.64, the hearing will be conducted by a Departmental Administrative Law Judge from the Office of Hearings and Appeals. After the hearing, the Administrative Law Judge will issue a decision...

  15. 30 CFR 1241.72 - How will the Office of Hearings and Appeals conduct the hearing on the record?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Oil and Gas Leases General Provisions § 1241.72 How will the Office of Hearings and Appeals conduct... or 1241.64, the hearing will be conducted by a Departmental Administrative Law Judge from the Office of Hearings and Appeals. After the hearing, the Administrative Law Judge will issue a decision...

  16. 30 CFR 1241.72 - How will the Office of Hearings and Appeals conduct the hearing on the record?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Oil and Gas Leases General Provisions § 1241.72 How will the Office of Hearings and Appeals conduct... or 1241.64, the hearing will be conducted by a Departmental Administrative Law Judge from the Office of Hearings and Appeals. After the hearing, the Administrative Law Judge will issue a decision...

  17. 25 CFR 87.4 - Conduct of hearings of record.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 25 Indians 1 2011-04-01 2011-04-01 false Conduct of hearings of record. 87.4 Section 87.4 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR TRIBAL GOVERNMENT USE OR DISTRIBUTION OF INDIAN JUDGMENT FUNDS § 87.4 Conduct of hearings of record. (a) As soon as appropriate after the tribal meetings have been held and the Commissioner...

  18. 29 CFR 1404.13 - Conduct of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Regulations Relating to Labor (Continued) FEDERAL MEDIATION AND CONCILIATION SERVICE ARBITRATION SERVICES Procedures for Arbitration Services § 1404.13 Conduct of hearings. All proceedings conducted by the... comply with § 1404.4(b). The conduct of the arbitration proceeding is under the arbitrator's...

  19. 29 CFR 1404.13 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Regulations Relating to Labor (Continued) FEDERAL MEDIATION AND CONCILIATION SERVICE ARBITRATION SERVICES Procedures for Arbitration Services § 1404.13 Conduct of hearings. All proceedings conducted by the... comply with § 1404.4(b). The conduct of the arbitration proceeding is under the arbitrator's...

  20. 40 CFR 222.7 - Conduct of public hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Conduct of public hearing. 222.7 Section 222.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN DUMPING ACTION ON OCEAN DUMPING PERMIT APPLICATIONS UNDER SECTION 102 OF THE ACT § 222.7 Conduct of public...

  1. 18 CFR 1304.5 - Conduct of hearings.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 18 Conservation of Power and Water Resources 2 2013-04-01 2012-04-01 true Conduct of hearings. 1304.5 Section 1304.5 Conservation of Power and Water Resources TENNESSEE VALLEY AUTHORITY APPROVAL OF... circulation in the area of the proposed structure, personal written notice, posting on TVA's Internet...

  2. 42 CFR 431.240 - Conducting the hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... involved in making the original decision, such a medical assessment must be obtained at agency expense and... 42 Public Health 4 2010-10-01 2010-10-01 false Conducting the hearing. 431.240 Section 431.240 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN...

  3. 20 CFR 658.709 - Conduct of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 20 Employees' Benefits 4 2014-04-01 2014-04-01 false Conduct of hearings. 658.709 Section 658.709 Employees' Benefits EMPLOYMENT AND TRAINING ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) ADMINISTRATIVE PROVISIONS GOVERNING THE JOB SERVICE SYSTEM Federal Application of Remedial Action to State Agencies §...

  4. 42 CFR 422.676 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Conduct of hearing. 422.676 Section 422.676 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICARE PROGRAM MEDICARE ADVANTAGE PROGRAM Medicare Contract Determinations and Appeals § 422.676...

  5. 40 CFR 750.19 - Conduct of informal hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Conduct of informal hearing. 750.19 Section 750.19 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) TOXIC SUBSTANCES CONTROL ACT PROCEDURES FOR RULEMAKING UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT Interim Procedural Rules for Manufacturing Exemptions...

  6. 40 CFR 750.39 - Conduct of informal hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Conduct of informal hearing. 750.39 Section 750.39 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) TOXIC SUBSTANCES CONTROL ACT PROCEDURES FOR RULEMAKING UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT Interim Procedural Rules for Processing and Distribution...

  7. 20 CFR 410.640 - Conduct of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 20 Employees' Benefits 2 2010-04-01 2010-04-01 false Conduct of hearing. 410.640 Section 410.640 Employees' Benefits SOCIAL SECURITY ADMINISTRATION FEDERAL COAL MINE HEALTH AND SAFETY ACT OF 1969, TITLE IV-BLACK LUNG BENEFITS (1969- ) Determinations of Disability, Other Determinations, Administrative...

  8. 20 CFR 658.709 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 20 Employees' Benefits 3 2010-04-01 2010-04-01 false Conduct of hearings. 658.709 Section 658.709 Employees' Benefits EMPLOYMENT AND TRAINING ADMINISTRATION, DEPARTMENT OF LABOR ADMINISTRATIVE PROVISIONS GOVERNING THE JOB SERVICE SYSTEM Federal Application of Remedial Action to State Agencies § 658.709...

  9. 40 CFR 750.7 - Conduct of legislative hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Conduct of legislative hearing. 750.7 Section 750.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) TOXIC SUBSTANCES CONTROL ACT PROCEDURES FOR RULEMAKING UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT Procedures for Rulemaking Under Section 6 of the...

  10. 18 CFR 1304.5 - Conduct of hearings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 18 Conservation of Power and Water Resources 2 2012-04-01 2012-04-01 false Conduct of hearings. 1304.5 Section 1304.5 Conservation of Power and Water Resources TENNESSEE VALLEY AUTHORITY APPROVAL OF CONSTRUCTION IN THE TENNESSEE RIVER SYSTEM AND REGULATION OF STRUCTURES AND OTHER ALTERATIONS Procedures...

  11. 18 CFR 1304.5 - Conduct of hearings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 18 Conservation of Power and Water Resources 2 2014-04-01 2014-04-01 false Conduct of hearings. 1304.5 Section 1304.5 Conservation of Power and Water Resources TENNESSEE VALLEY AUTHORITY APPROVAL OF CONSTRUCTION IN THE TENNESSEE RIVER SYSTEM AND REGULATION OF STRUCTURES AND OTHER ALTERATIONS Procedures...

  12. 18 CFR 1304.5 - Conduct of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 18 Conservation of Power and Water Resources 2 2011-04-01 2011-04-01 false Conduct of hearings. 1304.5 Section 1304.5 Conservation of Power and Water Resources TENNESSEE VALLEY AUTHORITY APPROVAL OF CONSTRUCTION IN THE TENNESSEE RIVER SYSTEM AND REGULATION OF STRUCTURES AND OTHER ALTERATIONS Procedures...

  13. 18 CFR 1304.5 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Conduct of hearings. 1304.5 Section 1304.5 Conservation of Power and Water Resources TENNESSEE VALLEY AUTHORITY APPROVAL OF CONSTRUCTION IN THE TENNESSEE RIVER SYSTEM AND REGULATION OF STRUCTURES AND OTHER ALTERATIONS Procedures...

  14. Comparison of umbo velocity in air- and bone-conduction.

    PubMed

    Röösli, Christof; Chhan, David; Halpin, Christopher; Rosowski, John J

    2012-08-01

    This study investigates the ossicular motion produced by bone-conducted (BC) sound in live human ears. Laser Doppler vibrometry was used to measure air conduction (AC)- and BC-induced umbo velocity (V(U)) in both ears of 10 subjects, 20 ears total. Sound pressure in the ear canal (P(EC)) was measured simultaneously. For air conduction, V(U) at standard hearing threshold level was calculated. For BC, ΔV was defined as the difference between V(U) and the tympanic ring velocity (an estimate of the skull velocity measured in the ear canal). ΔV and P(EC) at BC standard hearing threshold were calculated. ΔV at standard BC threshold was significantly smaller than V(U) at standard AC threshold between 500 Hz and 2000 Hz. Ear canal pressure at BC threshold tended to be smaller than for AC below 3000 Hz (with significant differences at 1000 Hz and 2000 Hz). Our results are most consistent with inertia of the ossicles and cochlear fluid driving BC hearing below 500 Hz, but with other mechanisms playing a significant role at higher frequencies. Sound radiated into the external ear canal might contribute to BC hearing at 3000 Hz and above. PMID:22609771

  15. Conductive hearing loss in Beckwith-Wiedemann syndrome.

    PubMed

    Schick, B; Brors, D; Prescher, A; Draf, W

    1999-05-01

    Beckwith-Wiedemann syndrome is a rare genetic overgrowth syndrome presenting with organomegaly, abdominal wall defects, macroglossia, and postnatal hypoglycemia. Head and neck manifestations of this abnormality include flame nevus of the forehead and characteristic sulci of the ear lobe. We present a 7-year-old child with Beckwith-Wiedemann syndrome and a rare finding of conductive hearing loss on both sides due to congenital malleus and stapedial fixation. Small fenestra stapedotomy and mobilization of malleus fixation in the epitympanum improved the child's hearing. The bony fixation of the malleus and stapes is explained as atavism of the processus anterior mallei and peripheral lamina stapedialis in embryological development. PMID:10375044

  16. 76 FR 34845 - Medical Devices; Ear, Nose, and Throat Devices; Classification of the Wireless Air-Conduction...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-15

    ... first FEDERAL REGISTER issue of each #0;week. #0; #0; #0; #0;#0;Federal Register / Vol. 76, No. 115... the Wireless Air-Conduction Hearing Aid AGENCY: Food and Drug Administration, HHS. ACTION: Final rule. SUMMARY: The Food and Drug Administration (FDA) is classifying the wireless air-conduction hearing...

  17. 43 CFR 30.270 - How will the hearing be conducted?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 43 Public Lands: Interior 1 2012-10-01 2011-10-01 true How will the hearing be conducted? 30.270 Section 30.270 Public Lands: Interior Office of the Secretary of the Interior INDIAN PROBATE HEARINGS PROCEDURES Tribal Purchase of Interests Under Special Statutes § 30.270 How will the hearing be conducted? (a) At the hearing, each party...

  18. 10 CFR 708.28 - What procedures govern a hearing conducted by the Office of Hearings and Appeals?

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 4 2010-01-01 2010-01-01 false What procedures govern a hearing conducted by the Office of Hearings and Appeals? 708.28 Section 708.28 Energy DEPARTMENT OF ENERGY DOE CONTRACTOR EMPLOYEE PROTECTION PROGRAM Investigation, Hearing and Decision Process § 708.28 What procedures govern a...

  19. 10 CFR 708.28 - What procedures govern a hearing conducted by the Office of Hearings and Appeals?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 4 2012-01-01 2012-01-01 false What procedures govern a hearing conducted by the Office of Hearings and Appeals? 708.28 Section 708.28 Energy DEPARTMENT OF ENERGY DOE CONTRACTOR EMPLOYEE PROTECTION PROGRAM Investigation, Hearing and Decision Process § 708.28 What procedures govern a...

  20. 10 CFR 708.28 - What procedures govern a hearing conducted by the Office of Hearings and Appeals?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 4 2014-01-01 2014-01-01 false What procedures govern a hearing conducted by the Office of Hearings and Appeals? 708.28 Section 708.28 Energy DEPARTMENT OF ENERGY DOE CONTRACTOR EMPLOYEE PROTECTION PROGRAM Investigation, Hearing and Decision Process § 708.28 What procedures govern a...

  1. 10 CFR 708.28 - What procedures govern a hearing conducted by the Office of Hearings and Appeals?

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 4 2013-01-01 2013-01-01 false What procedures govern a hearing conducted by the Office of Hearings and Appeals? 708.28 Section 708.28 Energy DEPARTMENT OF ENERGY DOE CONTRACTOR EMPLOYEE PROTECTION PROGRAM Investigation, Hearing and Decision Process § 708.28 What procedures govern a...

  2. 21 CFR 1316.51 - Conduct of hearing and parties; ex parte communications.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 9 2010-04-01 2010-04-01 false Conduct of hearing and parties; ex parte... ADMINISTRATIVE FUNCTIONS, PRACTICES, AND PROCEDURES Administrative Hearings § 1316.51 Conduct of hearing and... representatives, whether or not members of the bar, shall conduct themselves in accordance with judicial...

  3. 18 CFR 401.82 - Authorization to conduct hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... COMMISSION ADMINISTRATIVE MANUAL RULES OF PRACTICE AND PROCEDURE Administrative and Other Hearings § 401.82... administrative hearing is necessary or desirable. If the Commission denies any request for a hearing in...

  4. 21 CFR 1316.51 - Conduct of hearing and parties; ex parte communications.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 9 2012-04-01 2012-04-01 false Conduct of hearing and parties; ex parte communications. 1316.51 Section 1316.51 Food and Drugs DRUG ENFORCEMENT ADMINISTRATION, DEPARTMENT OF JUSTICE ADMINISTRATIVE FUNCTIONS, PRACTICES, AND PROCEDURES Administrative Hearings § 1316.51 Conduct of hearing...

  5. 7 CFR 1200.9 - Conduct of the hearing.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    .... The hearing shall be held at the time and place fixed in the notice of hearing, unless the judge shall have changed the time or place, in which event the judge shall file with the hearing clerk a notice of... five days prior to the date previously fixed for the hearing, the judge either in addition to or...

  6. 7 CFR 1200.9 - Conduct of the hearing.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    .... The hearing shall be held at the time and place fixed in the notice of hearing, unless the judge shall have changed the time or place, in which event the judge shall file with the hearing clerk a notice of... five days prior to the date previously fixed for the hearing, the judge either in addition to or...

  7. New developments in bone-conduction hearing implants: a review

    PubMed Central

    Reinfeldt, Sabine; Håkansson, Bo; Taghavi, Hamidreza; Eeg-Olofsson, Måns

    2015-01-01

    The different kinds of bone-conduction devices (BCDs) available for hearing rehabilitation are growing. In this paper, all BCDs currently available or in clinical trials will be described in categories according to their principles. BCDs that vibrate the bone via the skin are referred to as skin-drive devices, and are divided into conventional devices, which are attached with softbands, for example, and passive transcutaneous devices, which have implanted magnets. BCDs that directly stimulate the bone are referred to as direct-drive devices, and are further divided into percutaneous and active transcutaneous devices; the latter have implanted transducers directly stimulating the bone under intact skin. The percutaneous direct-drive device is known as a bone-anchored hearing aid, which is the BCD that has the largest part of the market today. Because of some issues associated with the percutaneous implant, and to some extent because of esthetics, more transcutaneous solutions with intact skin are being developed today, both in the skin-drive and in the direct-drive category. Challenges in developing transcutaneous BCDs are mostly to do with power, attachment, invasiveness, and magnetic resonance imaging compatibility. In the future, the authors assume that the existing percutaneous direct-drive BCD will be retained as an important rehabilitation alternative, while the transcutaneous solutions will increase their part of the market, especially for patients with bone-conduction thresholds better than 35 dB HL (hearing level). Furthermore, the active transcutaneous direct-drive BCDs appear to be the most promising systems, but to establish more detailed inclusion criteria, and potential benefits and drawbacks, more extensive clinical studies are needed. PMID:25653565

  8. 30 CFR 241.72 - How will the Office of Hearings and Appeals conduct the hearing on the record?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ..., DEPARTMENT OF THE INTERIOR MINERALS REVENUE MANAGEMENT PENALTIES Penalties for Federal and Indian Oil and Gas... will be conducted by a Departmental Administrative Law Judge from the Office of Hearings and Appeals. After the hearing, the Administrative Law Judge will issue a decision in accordance with the...

  9. 43 CFR 4.476 - Conduct of hearing; reporter's fees; transcript.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 43 Public Lands: Interior 1 2011-10-01 2011-10-01 false Conduct of hearing; reporter's fees; transcript. 4.476 Section 4.476 Public Lands: Interior Office of the Secretary of the Interior DEPARTMENT HEARINGS AND APPEALS PROCEDURES Special Rules Applicable to Public Land Hearings and Appeals...

  10. 43 CFR 4.476 - Conduct of hearing; reporter's fees; transcript.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false Conduct of hearing; reporter's fees; transcript. 4.476 Section 4.476 Public Lands: Interior Office of the Secretary of the Interior DEPARTMENT HEARINGS AND APPEALS PROCEDURES Special Rules Applicable to Public Land Hearings and Appeals...

  11. 43 CFR 4.476 - Conduct of hearing; reporter's fees; transcript.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 43 Public Lands: Interior 1 2014-10-01 2014-10-01 false Conduct of hearing; reporter's fees; transcript. 4.476 Section 4.476 Public Lands: Interior Office of the Secretary of the Interior DEPARTMENT HEARINGS AND APPEALS PROCEDURES Special Rules Applicable to Public Land Hearings and Appeals...

  12. 43 CFR 4.476 - Conduct of hearing; reporter's fees; transcript.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 43 Public Lands: Interior 1 2013-10-01 2013-10-01 false Conduct of hearing; reporter's fees; transcript. 4.476 Section 4.476 Public Lands: Interior Office of the Secretary of the Interior DEPARTMENT HEARINGS AND APPEALS PROCEDURES Special Rules Applicable to Public Land Hearings and Appeals...

  13. 43 CFR 4.476 - Conduct of hearing; reporter's fees; transcript.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 43 Public Lands: Interior 1 2012-10-01 2011-10-01 true Conduct of hearing; reporter's fees; transcript. 4.476 Section 4.476 Public Lands: Interior Office of the Secretary of the Interior DEPARTMENT HEARINGS AND APPEALS PROCEDURES Special Rules Applicable to Public Land Hearings and Appeals...

  14. Chronic Conductive Hearing Loss Leads to Cochlear Degeneration

    PubMed Central

    Liberman, M. Charles; Liberman, Leslie D.; Maison, Stéphane F.

    2015-01-01

    Synapses between cochlear nerve terminals and hair cells are the most vulnerable elements in the inner ear in both noise-induced and age-related hearing loss, and this neuropathy is exacerbated in the absence of efferent feedback from the olivocochlear bundle. If age-related loss is dominated by a lifetime of exposure to environmental sounds, reduction of acoustic drive to the inner ear might improve cochlear preservation throughout life. To test this, we removed the tympanic membrane unilaterally in one group of young adult mice, removed the olivocochlear bundle in another group and compared their cochlear function and innervation to age-matched controls one year later. Results showed that tympanic membrane removal, and the associated threshold elevation, was counterproductive: cochlear efferent innervation was dramatically reduced, especially the lateral olivocochlear terminals to the inner hair cell area, and there was a corresponding reduction in the number of cochlear nerve synapses. This loss led to a decrease in the amplitude of the suprathreshold cochlear neural responses. Similar results were seen in two cases with conductive hearing loss due to chronic otitis media. Outer hair cell death was increased only in ears lacking medial olivocochlear innervation following olivocochlear bundle cuts. Results suggest the novel ideas that 1) the olivocochlear efferent pathway has a dramatic use-dependent plasticity even in the adult ear and 2) a component of the lingering auditory processing disorder seen in humans after persistent middle-ear infections is cochlear in origin. PMID:26580411

  15. Sound-conducting mechanisms for echolocation hearing of a dolphin

    NASA Astrophysics Data System (ADS)

    Ryabov, Vyacheslav A.

    2005-09-01

    The morphological study of the lower jaw of a dolphin (Tursiops truncatus p.), and the modeling and calculation of its structures from the acoustic point of view have been conducted. It was determined that the cross-sectional area of the mandibular canal (MC) increases exponentially. The MC represents the acoustical horn. The mental foramens (MFs) is positioned in the horn throat, representing the nonequidistant array of waveguide delay lines (NAWDL). The acoustical horn ensures the traveling wave conditions inside the MC and intensifies sonar echoes up to 1514 times. This ``ideal'' traveling wave antenna is created by nature, representing the combination of the NAWDL and the acoustical horn. The dimensions and sequence of morphological structures of the lower jaw are optimal both for reception and forming the beam pattern, and for the amplification and transmission of sonar echoes up to the bulla tympani. Morphological structures of the lower jaw are considered as components of the peripheral section of the dolphin echolocation hearing.

  16. 40 CFR 222.11 - Conduct of adjudicatory hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... accordance with 40 CFR part 2. (9) The rules of evidence shall not apply. (f) Decision after adjudicatory... any issues raised therein. (e) Adjudicatory hearing procedures. (1) The burden of going forward with... basis therefor and shall be given by mail to all parties to the adjudicatory hearing....

  17. 50 CFR 228.16 - Conduct of the hearing.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... hearing, unless the presiding officer changes the time or place. If a change occurs, the presiding officer shall publish the change in the Federal Register and shall expeditiously notify all parties by telephone or by mail: Provided, that if that change in time or place of hearing is made less than 5 days...

  18. 7 CFR 900.8 - Conduct of the hearing.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... judicially noticed by the courts of the United States and of any other matter of technical, scientific or... notice of hearing, unless the judge shall have changed the time or place, in which event the judge shall file with the hearing clerk a notice of such change, which notice shall be given in the same manner...

  19. 50 CFR 228.16 - Conduct of the hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... hearing, unless the presiding officer changes the time or place. If a change occurs, the presiding officer shall publish the change in the Federal Register and shall expeditiously notify all parties by telephone or by mail: Provided, that if that change in time or place of hearing is made less than 5 days...

  20. 50 CFR 228.16 - Conduct of the hearing.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... hearing, unless the presiding officer changes the time or place. If a change occurs, the presiding officer shall publish the change in the Federal Register and shall expeditiously notify all parties by telephone or by mail: Provided, that if that change in time or place of hearing is made less than 5 days...

  1. 50 CFR 228.16 - Conduct of the hearing.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... hearing, unless the presiding officer changes the time or place. If a change occurs, the presiding officer shall publish the change in the Federal Register and shall expeditiously notify all parties by telephone or by mail: Provided, that if that change in time or place of hearing is made less than 5 days...

  2. 7 CFR 1.422 - Conduct of the hearing.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... the courts of the United States and of any other matter of technical, scientific, or commercial fact... change in the time or place of the hearing is made, the Judge shall file with the Hearing Clerk a notice of such change, which notice shall be served upon the parties, unless it is made during the course...

  3. 50 CFR 228.16 - Conduct of the hearing.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... hearing, unless the presiding officer changes the time or place. If a change occurs, the presiding officer shall publish the change in the Federal Register and shall expeditiously notify all parties by telephone or by mail: Provided, that if that change in time or place of hearing is made less than 5 days...

  4. 28 CFR 18.6 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Judicial Administration DEPARTMENT OF JUSTICE OFFICE OF JUSTICE PROGRAMS HEARING AND APPEAL PROCEDURES § 18... Department of Justice who was not involved in the administration, investigation or prosecution of the matter... Juvenile Justice Act or the Victims of Crime Act, the hearing officer shall be an administrative law...

  5. 37 CFR 251.46 - Conduct of hearings: Role of arbitrators.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 37 Patents, Trademarks, and Copyrights 1 2011-07-01 2011-07-01 false Conduct of hearings: Role of arbitrators. 251.46 Section 251.46 Patents, Trademarks, and Copyrights COPYRIGHT OFFICE, LIBRARY OF CONGRESS... PROCEDURE Procedures of Copyright Arbitration Royalty Panels § 251.46 Conduct of hearings: Role...

  6. 37 CFR 251.46 - Conduct of hearings: Role of arbitrators.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... COPYRIGHT ARBITRATION ROYALTY PANEL RULES AND PROCEDURES COPYRIGHT ARBITRATION ROYALTY PANEL RULES OF PROCEDURE Procedures of Copyright Arbitration Royalty Panels § 251.46 Conduct of hearings: Role of arbitrators. (a) At the opening of a hearing conducted by a Copyright Arbitration Royalty Panel,...

  7. Congenital stapes malformation: Rare conductive hearing loss in a patient with Waardenburg syndrome.

    PubMed

    Melzer, Jonathan M; Eliason, Michael; Conley, George S

    2016-04-01

    Waardenburg syndrome is a known autosomal dominant cause of congenital hearing loss. It is characterized by a distinctive phenotypic appearance and often involves sensorineural hearing loss. Temporal bone abnormalities and inner ear dysmorphisms have been described in association with the disease. However, middle ear abnormalities as causes of conductive hearing loss are not typically seen in Waardenburg syndrome. We discuss a case of an 8-year-old female who meets diagnostic criteria for Waardenburg syndrome type 3 and who presented with a bilateral conductive hearing loss associated with congenital stapes fixation. We discuss management strategy in this previously unreported phenotype. PMID:26152551

  8. 10 CFR 710.26 - Conduct of hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... a guide for procedures and principles designed to assure production of the most probative evidence... inquiry should be directed, the Hearing Officer shall recommend to the Manager concerned that, in order...

  9. 40 CFR 750.39 - Conduct of informal hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... membership of the panel may change as different topics arise during the hearing. In general, the panel... in the topics under discussion. One member of the panel will be named to chair the proceedings...

  10. 40 CFR 750.7 - Conduct of legislative hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... the panel may change as different topics arise during the hearing. In general, the panel membership... the topics under discussion. One member of the panel shall be named to chair the proceedings and...

  11. 7 CFR 900.8 - Conduct of the hearing.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... record of any previous hearing) the judge, after inquiry relating to the identification of such statute... judicially noticed by the courts of the United States and of any other matter of technical, scientific...

  12. 12 CFR 622.7 - Conduct of hearings.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... the record. In the event the hearing is public, transcripts will be furnished to interested persons... communication has knowledge that the proceeding will be noticed, the prohibitions apply from the time such knowledge is acquired....

  13. Vibrant Soundbridge and Bone Conduction Hearing Aid in Patients with Bilateral Malformation of External Ear

    PubMed Central

    Mondelli, Maria Fernanda Capoani Garcia; Mariano, Thais Cristina Barbosa; Honório, Heitor Marques; Brito, Rubens Vuono de

    2015-01-01

    Introduction Hearing loss is the most common clinical finding in patients with malformation of the external ear canal. Among the possibilities of treatment, there is the adaptation of hearing aids by bone conduction and the adaptation of implantable hearing aids. Objective To assess speech perception with the use of Vibrant Soundbridge (VBS - MED-EL, Innsbruck, Austria) associated with additional amplification in patients with bilateral craniofacial malformation. Method We evaluated 11 patients with bilateral malformation over 12 years with mixed hearing loss or bilateral conductive. They were using the Softband (Oticon Medical, Sweden) and bone conduction hearing aid in the ear opposite the one with the VSB. We performed the evaluation of speech perception using the Hearing in Noise Test. Results Participants were eight men and three women with a mean of 19.5 years. The signal / noise ratio presented significant results in patients fitted with VSB and bone conduction hearing aid. Conclusion The results of speech perception were significantly better with use of VBS combined with bone conduction hearing aids. PMID:26722343

  14. 19 CFR 201.13 - Conduct of nonadjudicative hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... general. Public hearings are held by the Commission when required by law or, if not required by law, when... proceedings and the complexity or importance of the questions of fact or law involved warrant, the presiding... to address confidential business information, as defined in § 201.6, during the course of...

  15. 25 CFR 87.4 - Conduct of hearings of record.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... consultation with the governing body of the tribe or group regarding the date and location of the hearing, to obtain the testimony of members of the governing body and other representatives, spokesmen or members of... transcript thereof shall be furnished to the Commissioner and the tribal governing body...

  16. 7 CFR 1200.9 - Conduct of the hearing.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... taken of such matters as are judicially noticed by the courts of the United States and of any other... have changed the time or place, in which event the judge shall file with the hearing clerk a notice of such change, which notice shall be given in the same manner as provided in § 1200.5 (relating to...

  17. 5 CFR 2472.9 - Conduct of hearing and prehearing conference.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... PANEL IMPASSES ARISING PURSUANT TO AGENCY DETERMINATIONS NOT TO ESTABLISH OR TO TERMINATE FLEXIBLE OR COMPRESSED WORK SCHEDULES Procedures of the Panel § 2472.9 Conduct of hearing and prehearing conference....

  18. Ectrodactyly, Ectodermal dysplasia, and Cleft Lip-Palate Syndrome; Its Association with Conductive Hearing Loss

    ERIC Educational Resources Information Center

    Robinson, Geoffrey C.; And Others

    1973-01-01

    Conductive hearing loss associated with the ectrodactyly, ectodermal dysplasia, and cleft lip palate syndrome was reported in one sporadic case and in a pedigree with four cases in three generations. (GW)

  19. The importance of the hook region of the cochlea for bone-conduction hearing.

    PubMed

    Kim, Namkeun; Steele, Charles R; Puria, Sunil

    2014-07-01

    For the most part, the coiled shape of the cochlea has been shown to have only minor importance for air-conducted hearing. It is hypothesized, however, that this coiled shape may play a more significant role for the bone-conducted (BC) route of hearing, through inertial forces exerted by the middle ear and cochlear fluid, and that this can be tested by comparing the results of applying BC stimuli in a variety of different directions. A three-dimensional finite element model of a human middle ear coupled to the inner ear was formulated. BC excitations were simulated by applying rigid-body vibrations normal to the surface of the basilar membrane (BM) at 0.8 (d(1)), 5.8 (d(2)), 15.6 (d(3)), and 33.1 (d(4)) mm from the base of the cochlea, such that relative motions of the fluid within the cochlea produced excitations of the BM. The vibrational direction normal to the BM surface at the base of the cochlea (d(1)) produced the highest BM velocity response across all tested frequencies-higher than an excitation direction normal to the BM surface at the nonbasal locations (d(2)-d(4)), even when the stimulus frequency matched the best frequency for each location. The basal part of the human cochlea features a well-developed hook region, colocated with the cochlear vestibule, that features the largest difference in fluid volume between the scala vestibuli (SV) and scala tympani (ST) found in the cochlea. The proximity of the hook region to the oval and round windows, combined with it having the biggest fluid-volume difference between the SV and ST, is thought to result in a maximization of the pressure difference between the SV and ST for BC stimuli normal to the BM in this region, and consequently a maximization of the resulting BM velocity. PMID:24988357

  20. Bone-conduction hearing aids in an elderly population: complications and quality of life assessment.

    PubMed

    Carr, Simon D; Moraleda, Javier; Baldwin, Alice; Ray, Jaydip

    2016-03-01

    To determine whether an elderly population with hearing impairment can be adequately rehabilitated with a bone-conduction hearing aid and whether the putative relationship between the elderly and an increased complication rate is justified. The study design was a retrospective case note review with a postal and telephone questionnaire, which was carried out in a tertiary centre. All patients aged 60 or over underwent implantation with a bone-conduction aid between 2009 and 2013 for conductive, SSD or mixed hearing loss. Outcome measures were complication rates and quality of life assessment using the Glasgow Benefit Inventory. The influence of patient and surgical factors on the complication rate was assessed. Fifty-one patients were implanted. Mean age was 67 years (range 60-89 years). The mean benefit, satisfaction and global GBI scores were 70 % (range 0-100 %), 70 % (0-100 %) and 82 % (83-100 %), respectively. The residual disability was 18 % (0-25 %). The adverse skin reaction rate was 16 % and the fixture loss rate was 2 %. There was a demonstrable increase in the complication rate with the dermatome (45 %; 5 patients) compared to the Sheffield 'S' (13 %; 2 patients) or linear incision techniques (29 %; 7 patients). The bone-conduction hearing aids are ideal method of hearing rehabilitation in the elderly for all forms of hearing loss. It provides significant benefit with no increased complication rate, which is imperative if social isolation is to be avoided and cognition preserved in this growing elderly population. PMID:25736468

  1. Comparative outcomes of active and passive hearing devices by transcutaneous bone conduction.

    PubMed

    Zernotti, Mario Emilio; Di Gregorio, Maria Fernanda; Galeazzi, Pablo; Tabernero, Paola

    2016-06-01

    Conclusion Bonebridge (BB) and Sophono (SP) devices improved hearing; with the BB implant showing a better performance at medium and high frequencies. Furthermore, the BB, as an active implant, showed higher functional gain and increased time of use, when compared to the SP, a passive system. Objectives This study aims to compare surgical and audiological outcomes of SP and BB devices in order to assess and further differentiate the indication criteria. Methods Fourteen patients with conductive and mixed hearing loss were evaluated pre- and post-operatively (BB or SP) (period 2013-2014). Age, gender, surgical history, cause and type of hearing loss, implant use per day, levels of bone and air conduction, and functional gain were recorded. Data was analysed by Wilcoxon singed-rank and Wilcoxon rank-sum tests. Results Fourteen patients (BB; n = 10 and SP; n = 4) with an average age = 25.42 years (CI95 = 12.41-38.43) were evaluated. The gender relation was equal (1:1), with pre-implantation osseous thresholds of 20.42 dB (CI95 = 11.15-29.69), and pre-implantation aerial thresholds of 70.83 dB (CI95 = 62.52-79.14). The SP wearing time was significantly lower than that of the BB (SP = 7-10 h/day, BB = 8-12 h/day; p = 0.0323). The functional gain did not differ significantly between the two devices (BB = 40.00 ± 13.19 dB, SP = 34.06 ± 15.63 dB; p = 0.3434), but a significant improvement from pre- to post-implantation was observed (p < 0.05). BB and SP decreased auditory thresholds at 1 and 2 kHz (< 0.01), respectively. The BB even significantly decreased thresholds at 0.5 kHz (p = 0.0140) and 4 kHz (p < 0.0001). No relevant surgical complications were found. PMID:26981711

  2. Hearing Deficit in a Birth Cohort of U.S. Male Commuter Air Carrier and Air Taxi Pilots

    PubMed Central

    Qiang, Yandong; Rebok, George W.; Baker, Susan P.; Li, Guohua

    2009-01-01

    Purpose Long-term exposure to multiple risk factors in aviation may place pilots at excess risk of developing hearing deficits. We examined the incidence and risk factors for hearing deficit in a birth cohort of male commuter and air taxi pilots. Methods The subjects (N = 3019), who were 45–54 yr of age and held Class I medical certificates in 1987, were followed up from 1987 to 1997 through the medical certification system of the Federal Aviation Administration (FAA). In this study, hearing deficit refers to the FAA pathology code 220 (defective hearing, deafness, not elsewhere classified). Poisson regression modeling based on generalized estimation equations was used to assess the associations between pilot characteristics and the risk of developing hearing deficit. Results The 10-yr follow-up accumulated a total of 20,671 person-years and 574 incident cases of hearing deficit, yielding an incidence rate of 27.8 per 1000 person-years. Compared with age 45–49 yr, the risk of developing hearing deficit at age 50–54 yr, 55–59 yr, and 60–64 yr increased by 12% [adjusted relative risk (RR) 1.12, 95% confidence interval (CI) 0.98–1.30], 34% (RR 1.34, 95% CI 1.13–1.59), and 79% (RR 1.79, 95% CI 1.20–2.67), respectively. Conclusions Hearing deficit is prevalent among commuter air carrier and air taxi pilots and the risk of hearing deficit increases progressively with pilot age. Effective programs for preventing excess hearing loss in the pilot population are warranted. PMID:18998487

  3. 21 CFR 12.90 - Conduct at oral hearings or conferences.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Conduct at oral hearings or conferences. 12.90 Section 12.90 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL... connection with any proceeding. Disrespectful, disorderly, or contumacious language or conduct, refusal...

  4. 29 CFR 101.29 - Procedure respecting election conducted without hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Procedure respecting election conducted without hearing... PROCEDURES Referendum Cases Under Section 9(e) (1) and (2) of the Act § 101.29 Procedure respecting election... conduct of the election and they have the same rights, and the same procedure is followed, with respect...

  5. 34 CFR 86.408 - What are the procedures for conducting a pre-hearing conference?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 34 Education 1 2011-07-01 2011-07-01 false What are the procedures for conducting a pre-hearing conference? 86.408 Section 86.408 Education Office of the Secretary, Department of Education DRUG AND ALCOHOL ABUSE PREVENTION Appeal Procedures § 86.408 What are the procedures for conducting a...

  6. 40 CFR 223.5 - Request for, scheduling and conduct of adjudicatory hearing; determination.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Request for, scheduling and conduct of adjudicatory hearing; determination. 223.5 Section 223.5 Protection of Environment ENVIRONMENTAL PROTECTION... Permits Under Section 104(d) of the Act § 223.5 Request for, scheduling and conduct of...

  7. 34 CFR 86.408 - What are the procedures for conducting a pre-hearing conference?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false What are the procedures for conducting a pre-hearing conference? 86.408 Section 86.408 Education Office of the Secretary, Department of Education DRUG AND ALCOHOL ABUSE PREVENTION Appeal Procedures § 86.408 What are the procedures for conducting a...

  8. In-Air and Underwater Hearing in the Great Cormorant (Phalacrocorax carbo sinensis).

    PubMed

    Johansen, Sasia; Larsen, Ole Næsbye; Christensen-Dalsgaard, Jakob; Seidelin, Lars; Huulvej, Tina; Jensen, Kristine; Lunneryd, Sven-Gunnar; Boström, Maria; Wahlberg, Magnus

    2016-01-01

    Hearing thresholds of a great cormorant (Phalacrocorax carbo) were measured in air and under water using psychophysics. The lowest thresholds were at 2 kHz (45 dB re 20 μPa root-mean-square [rms] in air and 79 dB re 1 μPa rms in water). Auditory brainstem response measurements on one anesthetized bird in air indicated an audiogram with a shape that resembled the one achieved by psychophysics. This study suggests that cormorants have rather poor in-air hearing abilities compared with other similar-size birds. The hearing capabilities in water are better than what would have been expected for a purely in-air adapted ear. PMID:26610998

  9. Operative findings of conductive hearing loss with intact tympanic membrane and normal temporal bone computed tomography.

    PubMed

    Kim, Se-Hyung; Cho, Yang-Sun; Kim, Hye Jeong; Kim, Hyung-Jin

    2014-06-01

    Despite recent technological advances in diagnostic methods including imaging technology, it is often difficult to establish a preoperative diagnosis of conductive hearing loss (CHL) in patients with an intact tympanic membrane (TM). Especially, in patients with a normal temporal bone computed tomography (TBCT), preoperative diagnosis is more difficult. We investigated middle ear disorders encountered in patients with CHL involving an intact TM and normal TBCT. We also analyzed the surgical results with special reference to the pathology. We reviewed the medical records of 365 patients with intact TM, who underwent exploratory tympanotomy for CHL. Fifty nine patients (67 ears, eight bilateral surgeries) had a normal preoperative TBCT findings reported by neuro-radiologists. Demographic data, otologic history, TM findings, preoperative imaging findings, intraoperative findings, and pre- and postoperative audiologic data were obtained and analyzed. Exploration was performed most frequently in the second and fifth decades. The most common postoperative diagnosis was stapedial fixation with non-progressive hearing loss. The most commonly performed hearing-restoring procedure was stapedotomy with piston wire prosthesis insertion. Various types of hearing-restoring procedures during exploration resulted in effective hearing improvement, especially with better outcome in the ossicular chain fixation group. In patients with CHL who have intact TM and normal TBCT, we should consider an exploratory tympanotomy for exact diagnosis and hearing improvement. Information of the common operative findings from this study may help in preoperative counseling. PMID:23744181

  10. 40 CFR 222.11 - Conduct of adjudicatory hearings.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... accordance with 40 CFR part 2. (9) The rules of evidence shall not apply. (f) Decision after adjudicatory....11 Section 222.11 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN DUMPING ACTION ON OCEAN DUMPING PERMIT APPLICATIONS UNDER SECTION 102 OF THE ACT § 222.11 Conduct of...

  11. 40 CFR 222.11 - Conduct of adjudicatory hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... accordance with 40 CFR part 2. (9) The rules of evidence shall not apply. (f) Decision after adjudicatory....11 Section 222.11 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN DUMPING ACTION ON OCEAN DUMPING PERMIT APPLICATIONS UNDER SECTION 102 OF THE ACT § 222.11 Conduct of...

  12. 40 CFR 222.11 - Conduct of adjudicatory hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... accordance with 40 CFR part 2. (9) The rules of evidence shall not apply. (f) Decision after adjudicatory....11 Section 222.11 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN DUMPING ACTION ON OCEAN DUMPING PERMIT APPLICATIONS UNDER SECTION 102 OF THE ACT § 222.11 Conduct of...

  13. 40 CFR 222.11 - Conduct of adjudicatory hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... accordance with 40 CFR part 2. (9) The rules of evidence shall not apply. (f) Decision after adjudicatory....11 Section 222.11 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN DUMPING ACTION ON OCEAN DUMPING PERMIT APPLICATIONS UNDER SECTION 102 OF THE ACT § 222.11 Conduct of...

  14. 40 CFR 223.5 - Request for, scheduling and conduct of adjudicatory hearing; determination.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... adjudicatory hearing; determination. 223.5 Section 223.5 Protection of Environment ENVIRONMENTAL PROTECTION... Permits Under Section 104(d) of the Act § 223.5 Request for, scheduling and conduct of adjudicatory... Administrator's determination issued pursuant to § 223.4(g), any person who participated in the public...

  15. 34 CFR 222.118 - How are withholding hearings conducted in this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false How are withholding hearings conducted in this subpart? 222.118 Section 222.118 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION IMPACT AID PROGRAMS Special Provisions for...

  16. 34 CFR 222.156 - How is an administrative hearing conducted?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false How is an administrative hearing conducted? 222.156 Section 222.156 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION IMPACT AID PROGRAMS Impact Aid...

  17. 34 CFR 99.22 - What minimum requirements exist for the conduct of a hearing?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false What minimum requirements exist for the conduct of a hearing? 99.22 Section 99.22 Education Office of the Secretary, Department of Education FAMILY EDUCATIONAL RIGHTS AND PRIVACY What Are the Procedures for Amending Education Records? § 99.22 What...

  18. 20 CFR 667.810 - What rules of procedure apply to hearings conducted under this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... by the OALJ at subpart A of 29 CFR part 18, govern the conduct of hearings under this subpart... answer by DOL or a DOL agency or official is required. Technical rules of evidence will not apply to... administrative file in support of the decision which must be made part of the record. Thereafter, the party...

  19. Comparison of Ear-Canal Reflectance and Umbo Velocity in Patients with Conductive Hearing Loss

    NASA Astrophysics Data System (ADS)

    Merchant, Gabrielle R.; Nakajima, Hideko H.; Pisano, Dominic V.; Röösli, Christof; Hamade, Mohamad A.; Mafoud, Lorice; Halpin, Christopher F.; Merchant, Saumil N.; Rosowski, John J.

    2011-11-01

    Patients who present at hearing clinics with a conductive hearing loss (CHL) in the presence of an intact, healthy tympanic membrane create a unique challenge for otologists. While patient counseling, treatment options, and outcome vary with differing middle-ear pathologies, a non-invasive diagnostic that can differentiate between these pathologies does not currently exist. We evaluated the clinical utility and diagnostic accuracy of two non-invasive measures of middle-ear mechanics: ear-canal reflectance (ECR) and umbo velocity (VU).

  20. Hearing

    ERIC Educational Resources Information Center

    Koehlinger, Keegan M.; Van Horne, Amanda J. Owen; Moeller, Mary Pat

    2013-01-01

    Purpose: Spoken language skills of 3- and 6-year-old children who are hard of hearing (HH) were compared with those of children with normal hearing (NH). Method: Language skills were measured via mean length of utterance in words (MLUw) and percent correct use of finite verb morphology in obligatory contexts based on spontaneous conversational…

  1. A study of mercuric oxide and zinc-air battery life in hearing aids.

    PubMed

    Sparkes, C; Lacey, N K

    1997-09-01

    The requirement to phase out mercuric oxide (mercury) batteries on environmental grounds has led to the widespread introduction of zinc-air technology. The possibility arises that high drain hearing aids may not be adequately catered for by zinc-air cells, leading to poor performance. This study investigated the hearing aid user's ability to perceive differences between zinc-air and mercury cells in normal everyday usage. The data was collected for 100 experienced hearing aid users in field trials. Users report 50 per cent greater life for zinc-air cells in high power aids and 28 per cent in low power aids. The average life of the zinc-air cells range from 15 days in high power to 34 days in low power aids. Users are able to perceive a difference in sound quality in favour of zinc-air cells for low and medium power aids. The hearing aid population is not disadvantaged by phasing out mercury cells. PMID:9373545

  2. Explicitly Teaching English through the Air to Students Who Are Deaf or Hard of Hearing

    ERIC Educational Resources Information Center

    Bennett, Jessica G.; Gardner, Ralph, III; Leighner, Ross; Clancy, Shannon; Garner, Joshua

    2014-01-01

    The Effects of the Language for Learning curriculum (Engelmann & Osborne, 1999) on through-the-air (i.e., signed and/or spoken) English skills for students who are deaf or hard of hearing (DHH) were examined by means of a single-subject, concurrent-multiple-probes-across-participants design. Four 11-year-old participants varied in auditory…

  3. 45 CFR 681.26 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 45 Public Welfare 3 2010-10-01 2010-10-01 false How will the hearing be conducted and who has the burden of proof? 681.26 Section 681.26 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Procedures § 681.26...

  4. 45 CFR 681.26 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 45 Public Welfare 3 2011-10-01 2011-10-01 false How will the hearing be conducted and who has the burden of proof? 681.26 Section 681.26 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Procedures § 681.26...

  5. 45 CFR 681.26 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 45 Public Welfare 3 2012-10-01 2012-10-01 false How will the hearing be conducted and who has the burden of proof? 681.26 Section 681.26 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Procedures § 681.26...

  6. 45 CFR 681.26 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 45 Public Welfare 3 2013-10-01 2013-10-01 false How will the hearing be conducted and who has the burden of proof? 681.26 Section 681.26 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Procedures § 681.26...

  7. 45 CFR 681.26 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 45 Public Welfare 3 2014-10-01 2014-10-01 false How will the hearing be conducted and who has the burden of proof? 681.26 Section 681.26 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Procedures § 681.26...

  8. 38 CFR 20.704 - Rule 704. Scheduling and notice of hearings conducted by the Board of Veterans' Appeals at...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 38 Pensions, Bonuses, and Veterans' Relief 2 2010-07-01 2010-07-01 false Rule 704. Scheduling and notice of hearings conducted by the Board of Veterans' Appeals at Department of Veterans Affairs field... (CONTINUED) BOARD OF VETERANS' APPEALS: RULES OF PRACTICE Hearings on Appeal § 20.704 Rule 704....

  9. Development of Bone-Conducted Ultrasonic Hearing Aid for the Profoundly Deaf: Assessments of the Modulation Type with Regard to Intelligibility and Sound Quality

    NASA Astrophysics Data System (ADS)

    Nakagawa, Seiji; Fujiyuki, Chika; Kagomiya, Takayuki

    2012-07-01

    Bone-conducted ultrasound (BCU) is perceived even by the profoundly sensorineural deaf. A novel hearing aid using the perception of amplitude-modulated BCU (BCU hearing aid: BCUHA) has been developed; however, further improvements are needed, especially in terms of articulation and sound quality. In this study, the intelligibility and sound quality of BCU speech with several types of amplitude modulation [double-sideband with transmitted carrier (DSB-TC), double-sideband with suppressed carrier (DSB-SC), and transposed modulation] were evaluated. The results showed that DSB-TC and transposed speech were more intelligible than DSB-SC speech, and transposed speech was closer than the other types of BCU speech to air-conducted speech in terms of sound quality. These results provide useful information for further development of the BCUHA.

  10. Nocturnal stomatal conductance and ambient air quality standards for ozone

    NASA Astrophysics Data System (ADS)

    Musselman, Robert C.; Minnick, Tamera J.

    Vegetation response to ozone depends on ozone conductance into leaves and the defensive action inside the leaf. Ozone parameters currently used for air quality standards do not incorporate conductance or defensive components. Nighttime flux has often been ignored in ozone metrics relating to plant response, since ozone concentration and conductance are considered to be minimal at night. However, ozone concentration can remain relatively high at night, particularly in mountainous areas. Although conductance is lower at night than during the day for most plants, nocturnal conductance can result in considerable ozone flux into plants. Further, plants can be more susceptible to ozone exposure at night than during the daytime, a result of lower plant defenses at night. Any ozone metric used to relate air quality to plant response should use a 24 h ozone exposure period to include the nighttime exposures. It should also incorporate plant defensive mechanisms or their surrogate.

  11. Prevalence of permanent threshold shifts in the United States Air Force hearing conservation program by career field, 2005-2011.

    PubMed

    Lloyd Soderlund, Laurel; McKenna, Elizabeth A; Tastad, Katie; Paul, Marika

    2016-01-01

    The purpose of this study was to describe changes in hearing, using the permanent threshold shift metric, among United States Air Force servicemembers, including active duty, Reserve and Air National Guard components, for demographics, job categories, and career fields. In the United States Air Force, only servicemembers who are occupationally exposed routinely to hazardous noise are monitored. Audiogram records and demographic variables were analyzed for servicemembers from 2005-2011 using data from the Department of Defense system that captures occupational hearing tests worldwide. Results suggest that occupational hearing loss was larger in males than females, in officers than enlisted populations, and in Reserve and Air National Guard than in active duty. Compared to similar civilian career fields, active duty has lower prevalence rates for occupational hearing loss overall, although Reserve and Air National Guard prevalence rates were more similar to the civilian reported rates. The proportion of personnel with permanent threshold shifts varied between 4.6-16.7% within active duty career fields, which includes 76% of the population for study timeframe. Permanent threshold shift was larger in small job categories, and in jobs that are not considered exposed to hazardous noise routinely which is comparative with results from civilian data analysis of occupational hearing loss. Further investigation into testing practices for Air Force specific groups, use of the system for nonoccupational hearing testing, and challenges to follow-up compliance is warranted. Increased surveillance procedures for occupational hearing loss are needed to address concerns on the prevalence of servicemember hearing loss, the role of recreational and lifestyle factors to contribute the high reported hearing loss prevalence of veterans compared to nonveterans. PMID:26720128

  12. [The prevalence of hearing impairment in transport workers and peculiarities of management of occupational loss of hearing (as exemplified by the situation in the air and railway transport)].

    PubMed

    Pankova, V B; Skryabina, L Yu; Kas'kov, Yu N

    2016-01-01

    This article presents data on the prevalence of hearing impairment among the workers engaged in the main means of transportation(air and railway transport). They show that the relative frequency of occupational loss of hearing in the cockpit members of commercial aviation amounts to one third of all cases of analogous diseases in this country. The main professional groups of transport works suffering from hearing impairment are constituted by the representatives of the so-called elite specialities, such as flying crew personnel, locomotive engineers, and their assistants. This fact constitutes an important aspect (not only of medical but also of socio-economic significance) of the problem under consideration. The high prevalence of professional hearing impairment among the transport workers is attributable to the high noise level in the cabins of locomotives and aircraft cockpits as well as to the inadequate expert and diagnostic work or imperfection of the regulatory documentation. PMID:26977561

  13. Behavioral trends in young children with conductive hearing loss: a case-control study.

    PubMed

    Gouma, Panagiota; Mallis, Antonios; Daniilidis, Vasilis; Gouveris, Haralambos; Armenakis, Nikolaos; Naxakis, Stephanos

    2011-01-01

    Otitis media with effusion (OME) is a common condition affecting children and a well-known cause of conductive hearing loss that can potentially lead to speech development disorders. Recent studies, however, have demonstrated the influence of OME on development of attention disorders or social adaptation and acceptance. Hence, this study aimed to investigate the behavioral trends of children with OME based on the Achenbach test. A group of 117 patients with episodes of OME at the age of 4-5 was compared with a control group according to the Achenbach system of evaluation, by application of the Child Behavior Checklist questionnaire (CBCL). Patients suffering from OME had more anxiety/depression related disorders and attention disorders as compared with the control group. The psychological effect of OME in children of ages 6-8 is evident with anxiety and depression disorders being especially prominent among these patients. PMID:20665042

  14. Hearing Loss in Adults.

    ERIC Educational Resources Information Center

    House, John W.

    1997-01-01

    This article discusses hearing loss in adults. It begins with an explanation of the anatomy of the ear and then explains the three types of hearing loss: conductive hearing loss, sensorineural hearing loss, and mixed conductive-sensorineural hearing loss. Tinnitus, hearing aids, and cochlear implants are also addressed. (CR)

  15. Air cushion vehicle conductive/semiconductive flexible skirt, and method

    NASA Astrophysics Data System (ADS)

    Cavenagh, Richard A.; Dyke, Raymond W.

    1990-03-01

    Discussed here is a method for dissipating static electrical energy from air cushion vehicles when operating more particularly in cold, low humidity environments, which method involves fabricating the skirt assembly from a flexible sheet material of at least semiconductive character, which will provide a suitable dissipating grounding pathway to discharge potential static electrical energy generated during the aforesaid operation. The method includes using a coated flexible fabric material having at least one of its opposite surfaces coated with an elastomeric abrasion-resistant material, and embedding a plurality of electrically conductive flexible strands at least partially within said flexible fabric material, or alternatively embedding electrically conductive particles or fibers in a generally uniformly manner throughout a forming of its elastomeric composition. The invention also is directed specifically to/on an air cushion vehicle skirt component comprised of electrically conductive composite flexible sheet material having sufficient conductive characteristics to provide a near constant dissipation grounding pathway from said vehicle for any substantial build up of generated static electrical energy, more particularly when the air cushion vehicle is operating in cold, low humidity environments.

  16. Air blast circuit breaker noise and hearing loss: a multifactorial model for risk assessment.

    PubMed

    McBride, D I; Williams, S

    2000-04-01

    The assessment of the risk to hearing from impulse noise exposure may be a problem for the occupational physician because existing legislative and international noise exposure standards deal primarily with continuous noise, and are not valid in excess of the peak exposure limit of 200 pa (140 dB). Noise exposure in excess of this level, for example that due to firearms, is frequently perceived as harmful, but this is not necessarily the case, as impulse noise standards do, in fact, allow exposure with a maximum in the order of 6.3 kPa (170 dB). To illustrate this, a cross-sectional group of electrical transmission workers have been studied who were exposed to significant levels of impulse noise from air blast circuit breakers and firearms. Important hearing loss factors have been identified by means of a specially designed questionnaire. Using the Health & Safety Executive definition, the risk of hearing loss was determined by calculating prevalence odds ratios (ORs) for exposure to these factors. The OR for those with fewer than eight unprotected air blast circuit breaker exposures was 2.27 (95% confidence interval (CI), 1.01-5.08), whilst for those with more than eight exposures the OR was 2.10 (95% CI, 0.97-4.54). For firearm exposure, ORs of 1.61 (95% CI, 0.95-2.74) were noted in the medium exposure group and 2.05 (95% CI, 1.08-3.86) in the high exposure group. When all the factors were included in the model, the most significant factor was age. The study gives support to the impulse noise exposure criteria, confirming the borderline risk from air blast circuit breaker noise exposure and the relative safety of moderate gunfire exposure. PMID:10912360

  17. About Hearing

    MedlinePlus

    ... ability to hear and understand. The duration and nature of a conductive loss will influence a student's ... nih.gov/health/hearing/neuropathy.asp . Implications: The nature and extent to which the hair cells in ...

  18. Air Traffic Controllers Testing and Training Program. Hearing before the Subcommittee on Aviation of the Committee on Commerce, Science, and Transportation, United States Senate, Ninety-Seventh Congress. First Session (December 16, 1981). Serial No. 97-84.

    ERIC Educational Resources Information Center

    Congress of the U.S., Washington, DC. Senate Committee on Commerce, Science, and Transportation.

    This document is a transcript of a United States Senate subcommittee hearing which was conducted to review the effort the Department of Transportation and the Federal Aviation Administration have undertaken to hire and train new air traffic controllers to take the places of those controllers who went on strike in August, 1981, and were…

  19. 34 CFR 222.110 - What are the procedures for conducting a hearing on a local educational agency's Indian policies...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false What are the procedures for conducting a hearing on a local educational agency's Indian policies and procedures? 222.110 Section 222.110 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY...

  20. Bone-conduction hearing and seismic sensitivity of the Late Permian anomodont Kawingasaurus fossilis.

    PubMed

    Laaß, Michael

    2015-02-01

    An investigation of the internal cranial anatomy of the anomodont Kawingasaurus from the Upper Permian Usili Formation in Tanzania by means of neutron tomography revealed an unusual inner and middle ear anatomy such as extraordinarily inflated vestibules, lateroventrally orientated stapes with large footplates, and a small angle between the planes of the anterior and lateral semicircular canals. The vestibule has a volume, which is about 25 times larger than the human vestibule, although Kawingasaurus has only a skull length of approximately 40 mm. Vestibule inflation and enlarged stapes footplates are thought to be functionally correlated with bone-conduction hearing; both morphologies have been observed in fossorial vertebrates using seismic signals for communication. The firmly fused triangular head with spatulate snout was probably used for digging and preadapted to seismic signal detection. The quadrate-quadratojugal complex was able to transmit sound from the articular to the stapes by small vibrations of the quadrate process, which formed a ball and socket joint with the squamosal. Mechanical considerations suggest that the ventrolaterally orientated stapes of Kawingasaurus was mechanically better suited to transmit seismic sound from the ground to the fenestra vestibuli than a horizontal orientated stapes. The low sound pressure level transformer ratio of 2-3 in Kawingasaurus points to a seismic sensitivity of the middle ear and a vestigial or reduced sensitivity to airborne sound. Three hypothetical pathways of bone conduction in Kawingasaurus are discussed: 1) sound transmission via the spatulate snout and skull roof to the otic capsules, 2) relative movements resulting from the inertia of the mandible if sound is percepted with the skull, and 3) bone conduction from the substrate via mandible, jaw articulation, and stapes to the inner ear. PMID:25284624

  1. Transmission of bone conducted sound - correlation between hearing perception and cochlear vibration.

    PubMed

    Eeg-Olofsson, Måns; Stenfelt, Stefan; Taghavi, Hamidreza; Reinfeldt, Sabine; Håkansson, Bo; Tengstrand, Tomas; Finizia, Caterina

    2013-12-01

    The vibration velocity of the lateral semicircular canal and the cochlear promontory was measured on 16 subjects with a unilateral middle ear common cavity, using a laser Doppler vibrometer, when the stimulation was by bone conduction (BC). Four stimulation positions were used: three ipsilateral positions and one contralateral position. Masked BC pure tone thresholds were measured with the stimulation at the same four positions. Valid vibration data were obtained at frequencies between 0.3 and 5.0 kHz. Large intersubject variation of the results was found with both methods. The difference in cochlear velocity with BC stimulation at the four positions varied as a function of frequency while the tone thresholds showed a tendency of lower thresholds with stimulation at positions close to the cochlea. The correlation between the vibration velocities of the two measuring sites of the otic capsule was high. Also, relative median data showed similar trends for both vibration and threshold measurements. However, due to the high variability for both vibration and perceptual data, low correlation between the two methods was found at the individual level. The results from this study indicated that human hearing perception from BC sound can be estimated from the measure of cochlear vibrations of the otic capsule. It also showed that vibration measurements of the cochlea in cadaver heads are similar to that measured in live humans. PMID:24047594

  2. 49 CFR 232.217 - Train brake tests conducted using yard air.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Train brake tests conducted using yard air. 232... Train brake tests conducted using yard air. (a) When a train air brake system is tested from a yard air... reduction of brake pipe air pressure at the same, or slower, rate as an engineer's brake valve. (b) The...

  3. 49 CFR 232.217 - Train brake tests conducted using yard air.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 49 Transportation 4 2012-10-01 2012-10-01 false Train brake tests conducted using yard air. 232... Train brake tests conducted using yard air. (a) When a train air brake system is tested from a yard air... reduction of brake pipe air pressure at the same, or slower, rate as an engineer's brake valve. (b) The...

  4. 49 CFR 232.217 - Train brake tests conducted using yard air.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 49 Transportation 4 2014-10-01 2014-10-01 false Train brake tests conducted using yard air. 232... Train brake tests conducted using yard air. (a) When a train air brake system is tested from a yard air... reduction of brake pipe air pressure at the same, or slower, rate as an engineer's brake valve. (b) The...

  5. 49 CFR 232.217 - Train brake tests conducted using yard air.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 49 Transportation 4 2013-10-01 2013-10-01 false Train brake tests conducted using yard air. 232... Train brake tests conducted using yard air. (a) When a train air brake system is tested from a yard air... reduction of brake pipe air pressure at the same, or slower, rate as an engineer's brake valve. (b) The...

  6. 49 CFR 232.217 - Train brake tests conducted using yard air.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 49 Transportation 4 2011-10-01 2011-10-01 false Train brake tests conducted using yard air. 232... Train brake tests conducted using yard air. (a) When a train air brake system is tested from a yard air... reduction of brake pipe air pressure at the same, or slower, rate as an engineer's brake valve. (b) The...

  7. 43 CFR 30.270 - How will the hearing be conducted?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...) Forward the complete record relating to the demand for hearing to the LTRO as provided in § 30.233; (2) Furnish a duplicate record thereof to the agency; and (3) Mail a notice of such action together with...

  8. 43 CFR 30.270 - How will the hearing be conducted?

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...) Forward the complete record relating to the demand for hearing to the LTRO as provided in § 30.233; (2) Furnish a duplicate record thereof to the agency; and (3) Mail a notice of such action together with...

  9. Contralateral routing of signal hearing aid versus transcutaneous bone conduction in single-sided deafness.

    PubMed

    Leterme, Gaëlle; Bernardeschi, Daniele; Bensemman, Anissa; Coudert, Cyrille; Portal, Jean-Jacques; Ferrary, Evelyne; Sterkers, Olivier; Vicaut, Eric; Frachet, Bruno; Bozorg Grayeli, Alexis

    2015-01-01

    The aim of this study was to compare a contralateral routing of signal (CROS) hearing aid to a transcutaneous bone-anchored device in the same conditions. This prospective crossover study included 18 adult patients with a single-sided deafness (SSD). After a trial period of 60 days with CROS and 7 days with a transcutaneous bone-anchored device (Alpha 1®, Sophono, Boulder, Colo., USA) on a headband, 13 (72%) patients opted for Alpha 1, 2 patients for CROS, and 3 rejected both rehabilitation methods. Clinical tolerance, satisfaction, hearing performances (pure-tone audiometry, speech test in quiet and in noise, stereo audiometry, sound localization, and Hearing in Noise Test), and quality of life (Glasgow Benefit Inventory, Abbreviated Profile of Hearing Aid Benefit and Glasgow Hearing Aid Benefit questionnaires) were measured at 3 and 12 months after the implantation. Both devices improved equally the hearing in noise and the quality of life. Transcutaneous devices represent an effective option in SSD. PMID:26021779

  10. Development of a Bone-Conducted Ultrasonic Hearing Aid for the Profoundly Deaf: Evaluation of Sound Quality Using a Semantic Differential Method

    NASA Astrophysics Data System (ADS)

    Nakagawa, Seiji; Fujiyuki, Chika; Kagomiya, Takayuki

    2013-07-01

    Bone-conducted ultrasound (BCU) is perceived even by the profoundly sensorineural deaf. A novel hearing aid using the perception of amplitude-modulated BCU (BCU hearing aid: BCUHA) has been developed. However, there is room for improvement particularly in terms of sound quality. BCU speech is accompanied by a strong high-pitched tone and contain some distortion. In this study, the sound quality of BCU speech with several types of amplitude modulation [double-sideband with transmitted carrier (DSB-TC), double-sideband with suppressed carrier (DSB-SC), and transposed modulations] and air-conducted (AC) speech was quantitatively evaluated using semantic differential and factor analysis. The results showed that all the types of BCU speech had higher metallic and lower esthetic factor scores than AC speech. On the other hand, transposed speech was closer than the other types of BCU speech to AC speech generally; the transposed speech showed a higher powerfulness factor score than the other types of BCU speech and a higher esthetic factor score than DSB-SC speech. These results provide useful information for further development of the BCUHA.

  11. Self-demodulation of amplitude-modulated signal components in amplitude-modulated bone-conducted ultrasonic hearing

    NASA Astrophysics Data System (ADS)

    Ito, Kazuhito; Nakagawa, Seiji

    2015-07-01

    A novel hearing aid system utilizing amplitude-modulated bone-conducted ultrasound (AM-BCU) is being developed for use by profoundly deaf people. However, there is a lack of research on the acoustic aspects of AM-BCU hearing. In this study, acoustic fields in the ear canal under AM-BCU stimulation were examined with respect to the self-demodulation effect of amplitude-modulated signal components generated in the ear canal. We found self-demodulated signals with an audible sound pressure level related to the amplitude-modulated signal components of bone-conducted ultrasonic stimulation. In addition, the increases in the self-demodulated signal levels at low frequencies in the ear canal after occluding the ear canal opening, i.e., the positive occlusion effect, indicate the existence of a pathway by which the self-demodulated signals pass through the aural cartilage and soft tissue, and radiate into the ear canal.

  12. The effects of experimentally induced conductive hearing loss on spectral and temporal aspects of sound transmission through the ear

    PubMed Central

    Lupo, J. Eric; Koka, Kanthaiah; Thornton, Jennifer L.; Tollin, Daniel J.

    2010-01-01

    Conductive hearing loss (CHL) is known to produce hearing deficits, including deficits in sound localization ability. The differences in sound intensities and timing experienced between the two tympanic membranes are important cues to sound localization (ILD and ITD, respectively). Although much is known about the effect of CHL on hearing levels, little investigation has been conducted into the actual impact of CHL on sound location cues. This study investigated effects of CHL induced by earplugs on cochlear microphonic (CM) amplitude and timing and their corresponding effect on the ILD and ITD location cues. Acoustic and CM measurements were made in 5 chinchillas before and after earplug insertion, and again after earplug removal using pure tones (500 Hz to 24 kHz). ILDs in the unoccluded condition demonstrated position and frequency dependence where peak far-lateral ILDs approached 30 dB for high frequencies. Unoccluded ear ITD cues demonstrated positional and frequency dependence with increased ITD cue for both decreasing frequency (± 420 µs at 500 Hz, ± 310 µs for 1–4 kHz ) and increasingly lateral sound source locations. Occlusion of the ear canal with foam plugs resulted in a mild, frequency-dependent conductive hearing loss of 10–38 dB (mean 31 ± 3.9 dB) leading to a concomitant frequency dependent increase in ILDs at all source locations. The effective ITDs increased in a frequency dependent manner with ear occlusion as a direct result of the acoustic properties of the plugging material, the latter confirmed via acoustical measurements using a model ear canal with varying volumes of acoustic foam. Upon ear plugging with acoustic foam, a mild CHL is induced. Furthermore, the CHL induced by acoustic foam results in substantial changes in the magnitudes of both the ITD and ILD cues to sound location. PMID:21073935

  13. Determinants of Change in Air-Bone Gap and Bone Conduction in Patients Operated on for Chronic Otitis Media

    PubMed Central

    Wiatr, Maciej; Wiatr, Agnieszka; Składzień, Jacek; Stręk, Paweł

    2015-01-01

    Background Middle ear surgery aims to eliminate pathology from the middle ear, improve drainage and ventilation of the postoperative cavity, and reconstruct the tympanic membrane and ossicles. The aim of this work is to define the factors that affect ABG (air-bone gap) and bone conduction in the patients operated on due to chronic otitis media. Material/Methods A prospective analysis of patients operated on due to diseases of the middle ear during 2009–2012 was carried out. The cases of patients operated on for the first time due to chronic otitis media were analyzed. The analysis encompassed patients who had undergone middle ear surgery. The patients were divided into several groups taking into account the abnormalities of the middle ear mucous and damage of the ossicular chain observed during otosurgery. Results A significant hearing improvement was observed in patients with type 2 tympanoplasty in the course of chronic cholesteatoma otitis media and in patients with simple chronic inflammatory process in whom a PORP was used in the reconstruction. Granulation tissue was an unfavorable factor of hearing improvement following tympanoplasty. A significant improvement of bone conduction was observed in the patients with dry perforation without other lesions in the middle ear. The elimination of granulation lesions was a positive factor for the future improvement of the function of the inner ear. Conclusions The presence of granuloma-related lesions in the middle ear spaces is likely to impede hearing improvement. Damage to the ossicular chain rules out the possibility of bone conduction improvement after surgery. The prognosis on tube-related simple chronic otitis media after myringoplasty, with the preserved continuity of the ossicular chain, consists of closing the ABG and leads to significant improvement of bone conduction. PMID:26259623

  14. 40 CFR 223.4 - Request for, scheduling and conduct of public hearing; determination.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... person having the qualifications of the members of the Environmental Appeals Board (described in 40 CFR 1... person on request, without charge. Copies of the record will be provided in accordance with 40 CFR part 2... public hearing; determination. 223.4 Section 223.4 Protection of Environment ENVIRONMENTAL...

  15. 34 CFR 222.118 - How are withholding hearings conducted in this subpart?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... submissions must be filed with the hearing examiner by hand-delivery, mail, or facsimile transmission. The...-up hard copy by hand-delivery or mail within a reasonable period of time. (e) Procedural rules. (1... each party and the affected Indian tribe or tribes, by certified mail with return receipt...

  16. Hear, Hear!

    ERIC Educational Resources Information Center

    Rittner-Heir, Robbin

    2000-01-01

    Examines the problem of acoustics in school classrooms; the problems it creates for student learning, particularly for students with hearing problems; and the impediments to achieving acceptable acoustical levels for school classrooms. Acoustic guidelines are explored and some remedies for fixing sound problems are highlighted. (GR)

  17. Deaf and Hard of Hearing Students' Through-the-Air English Skills: A Review of Formal Assessments

    ERIC Educational Resources Information Center

    Bennett, Jessica G.; Gardner, Ralph, III; Rizzi, Gleides Lopes

    2013-01-01

    Strong correlations exist between signed and/or spoken English and the literacy skills of deaf and hard of hearing students. Assessments that are both valid and reliable are key for researchers and practitioners investigating the signed and/or spoken English skills of signing populations. The authors conducted a literature review to explore which…

  18. A Three-Dimensional Finite-Element Model of a Human Dry Skull for Bone-Conduction Hearing

    PubMed Central

    2014-01-01

    A three-dimensional finite-element (FE) model of a human dry skull was devised for simulation of human bone-conduction (BC) hearing. Although a dry skull is a simplification of the real complex human skull, such model is valuable for understanding basic BC hearing processes. For validation of the model, the mechanical point impedance of the skull as well as the acceleration of the ipsilateral and contralateral cochlear bone was computed and compared to experimental results. Simulation results showed reasonable consistency between the mechanical point impedance and the experimental measurements when Young's modulus for skull and polyurethane was set to be 7.3 GPa and 1 MPa with 0.01 and 0.1 loss factors at 1 kHz, respectively. Moreover, the acceleration in the medial-lateral direction showed the best correspondence with the published experimental data, whereas the acceleration in the inferior-superior direction showed the largest discrepancy. However, the results were reasonable considering that different geometries were used for the 3D FE skull and the skull used in the published experimental study. The dry skull model is a first step for understanding BC hearing mechanism in a human head and simulation results can be used to predict vibration pattern of the bone surrounding the middle and inner ear during BC stimulation. PMID:25243148

  19. BAHA: Bone-Anchored Hearing Aid

    PubMed Central

    Hagr, Abdulrahman

    2007-01-01

    Bone-Anchored Hearing Aid (BAHA) has proven performance and advantages for patients with aural atresia or chronic ear drainage who cannot wear air-conduction hearing aids. The BAHA has both cosmetic and acoustic advantages over most conventional hearing aids and hence is becoming increasingly popular. Moreover, BAHA improves the quality of life and has also significantly reduces ear discharge. This extensive review of the literature pertaining to BAHA discus the history, the indications, the advantages, the prediction of the outcome and the complications of this device as well as comparing it to the conventional hearing aids. PMID:21475438

  20. A Conductivity Device for Measuring Sulfur Dioxide in the Air

    ERIC Educational Resources Information Center

    Craig, James C.

    1972-01-01

    Described is a general electroconductivity device enabling students to determine sulfur dioxide concentration in a particular location, hopefully leading to a deeper understanding of the problem of air pollution. (DF)

  1. The bonebridge as a transcutaneous bone conduction hearing system: preliminary surgical and audiological results in children and adolescents.

    PubMed

    Hassepass, Frederike; Bulla, Stefan; Aschendorff, Antje; Maier, Wolfgang; Traser, Louisa; Steinmetz, Christian; Wesarg, Thomas; Arndt, Susan

    2015-09-01

    The Bonebridge (®) (BB, Med-El) is a newly designed transcutaneous active bone conductive implant with functional outcome similar to percutaneous bone-anchored hearing systems (BAHS). It is currently approved only for patients ≥18 years. Since the BB allows the skin to remain intact and therefore should be able to overcome some of the issues related to percutaneous BAHS including skin reactions, wound infection and implant extrusion, it would be especially attractive for use in children. We present a preliminary series of the first three cases of BB implantation in children/adolescents (10-16 years). Two subjects were affected by conductive hearing loss (CHL) and one subject by single-sided deafness (SSD). The surgical procedure with transmastoid approach was completed in all cases without complications. Both subjects with CHL showed an increase in speech perception thresholds in quiet from preoperative unaided to 6 months postoperatively with BB of 37 dB, respectively, of 12 dB. The adolescent with SSD attained -3.1 dB unaided vs. -5.6 dB with the BB in the "speech and noise from the front" presentation and +0.5 unaided vs. -5.0 dB with the BB in the "speech from the unilateral deaf side/noise from the normal hearing side" presentation using the adaptive Oldenburg Sentence Test. The results show a straightforward surgical procedure and satisfactory functional gain after BB implantation also in children/adolescents. BB implantation in patients ≤18 years is currently an "off-label use" so that detailed information about alternative treatment options, operation risks and the lack of approval for use in children is essential. PMID:24970289

  2. 13 CFR 142.21 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... ADMINISTRATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Provisions § 142.21 How will the hearing be... defendant is liable for a civil penalty, assessment, or both and, if so, the appropriate amount of the...

  3. 13 CFR 142.21 - How will the hearing be conducted and who has the burden of proof?

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... ADMINISTRATION PROGRAM FRAUD CIVIL REMEDIES ACT REGULATIONS Hearing Provisions § 142.21 How will the hearing be... defendant is liable for a civil penalty, assessment, or both and, if so, the appropriate amount of the...

  4. Ground level measurements of air conductivities under Florida thunderstorms

    NASA Technical Reports Server (NTRS)

    Blakeslee, Richard J.; Krider, E. P.

    1992-01-01

    Values of the positive and negative polar conductivities under summer thunderstorms in Florida are highly variable and exhibit a significant electrode effect, but the total conductivity usually remains close to values found in fair weather, 0.4 to 1.8 x 10 exp -14 S/m. With these values a method proposed by Krider and Musser (1982) for estimating the total conductivity from changes in the slope of the electric field recovery following a lightning discharge will be extremely sensitive to small time variations in the local Maxwell current density and must be modified to include these effects.

  5. 38 CFR 20.702 - Rule 702. Scheduling and notice of hearings conducted by the Board of Veterans' Appeals in...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 38 Pensions, Bonuses, and Veterans' Relief 2 2010-07-01 2010-07-01 false Rule 702. Scheduling and...' APPEALS: RULES OF PRACTICE Hearings on Appeal § 20.702 Rule 702. Scheduling and notice of hearings... scheduling hearings for the Board of Veterans' Appeals determine that necessary physical resources...

  6. Value of digital volume tomography in patients with conductive hearing loss.

    PubMed

    Dalchow, C V; Weber, A L; Bien, S; Yanagihara, N; Werner, J A

    2006-02-01

    Digital volume tomography (DVT) is an extension of panoramic tomography. With this diagnostic technique, characterized by high resolution, a narrow section width (0.125 mm) and three-dimensional display, small pathological processes can be well visualized. Twenty-five patients with the history of a progressive hearing loss were examined with DVT (Accu-I-tomo, Morita, Japan). The results were compared with pre- and intraoperative findings to evaluate the diagnostic value of DVT in cases of erosion of the ossicular chain. With high resolution and artifact-free demonstration of the middle ear and the ossicular chain, it was possible to define its continuity preoperatively by DVT in all 25 cases. An intact ossicular chain was found by DVT in 13 cases and was later confirmed by surgery. The predicted erosion of the ossicles was verified in 12 patients, and a tympanoplasty type III was performed. Digital volume tomography is an excellent technique to examine the middle ear cleft and inner ear, and expands the application of diagnostic possibilities in the lateral skull base. Therefore, improvement in preoperative diagnosis is achieved along with more accurate planning of the surgical procedure. Digital volume tomography delivers a small radiation dose with a high resolution and a low purchase price for the equipment. PMID:16163510

  7. 37 CFR 251.47 - Conduct of hearings: Witnesses and counsel.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... OF CONGRESS COPYRIGHT ARBITRATION ROYALTY PANEL RULES AND PROCEDURES COPYRIGHT ARBITRATION ROYALTY PANEL RULES OF PROCEDURE Procedures of Copyright Arbitration Royalty Panels § 251.47 Conduct of...

  8. Fish Hearing.

    ERIC Educational Resources Information Center

    Blaxter, J. H. S.

    1980-01-01

    Provides related information about hearing in fish, including the sensory stimulus of sound in the underwater environment, mechanoreceptors in fish, pressure perception and the swimbladder, specializations in sound conduction peculiar to certain fish families. Includes numerous figures. (CS)

  9. Cochlear nucleus neurons redistribute synaptic AMPA and glycine receptors in response to monaural conductive hearing loss

    PubMed Central

    Whiting, Brittany; Moiseff, Andrew; Rubio, María E.

    2009-01-01

    Neurons restore their function in response to external or internal perturbations and maintain neuronal or network stability through a homeostatic scaling mechanism. Homeostatic responses at synapses along the auditory system would be important for adaptation to normal and abnormal fluctuations in the sensory environment. We investigated at the electron microscopic level and after postembedding immunogold labeling whether projection neurons in the cochlear nucleus responded to modifications of auditory nerve activity. After unilaterally reducing the level of auditory inputs by ~ 20 dB by monaural earplugging, auditory nerve synapses on bushy cells somata and basal dendrites of fusiform cells of the ventral and dorsal cochlear nucleus, respectively, upregulated GluR3 AMPA receptor subunit, while inhibitory synapses decreased the expression of GlyRα1 subunit. These changes in expression levels were fully reversible once the earplug was removed, indicating that activity affects the trafficking of receptors at synapses. Excitatory synapses on apical dendrites of fusiform cells (parallel fibers) with different synaptic AMPA receptor subunit composition, were not affected by sound attenuation, as the expression levels of AMPA receptor subunits were the same as in normal hearing littermates. GlyRα1 subunit expression at inhibitory synapses on apical dendrites of fusiform cells was also found unaffected. Furthermore, fusiform and bushy cells of the contralateral side to the earplugging upregulated the GluR3 subunit at auditory nerve synapses. These results show that cochlear nucleus neurons innervated by the auditory nerve, are able to respond to small changes in sound levels by redistributing specific AMPA and glycine receptor subunits. PMID:19646510

  10. Hearing Loss in Children: Types of Hearing Loss

    MedlinePlus

    ... the ear to the brain so that our brain pathways are part of our hearing. There are four types of hearing loss: Conductive Hearing Loss Hearing loss caused by something that stops sounds from getting through the outer or middle ear. This type of hearing loss can often ...

  11. 37 CFR 251.47 - Conduct of hearings: Witnesses and counsel.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... may present its opening statement with the presentation of its direct case. (c) All witnesses shall be... proof. (i) The CARP shall discourage the presentation of cumulative evidence, and may limit the number... agreement on the selection of a representative, each individual or group will be allowed to conduct its...

  12. 40 CFR 223.4 - Request for, scheduling and conduct of public hearing; determination.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... person having the qualifications of the members of the Environmental Appeals Board (described in 40 CFR 1... person on request, without charge. Copies of the record will be provided in accordance with 40 CFR part 2... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Request for, scheduling and conduct...

  13. Understanding an Audiogram. Tipsheet: Serving Students Who Are Hard of Hearing

    ERIC Educational Resources Information Center

    Johnson, Marni

    2009-01-01

    The type, degree, and configuration of hearing loss, if one is present, can be determined by reading an audiogram. The type of hearing loss is determined by comparing auditory thresholds obtained using head-phones or insert earphones (air-conduction thresholds) to those obtained using a bone oscillator (bone-conduction thresholds). By itself, the…

  14. Middle Ear Infection (Chronic Otitis Media) and Hearing Loss

    MedlinePlus

    ... You Middle Ear Infection (Chronic Otitis Media) and Hearing Loss Middle Ear Infection (Chronic Otitis Media) and Hearing ... learning important speech and language skills. Types of hearing loss Conductive hearing loss is a form of hearing ...

  15. 18 CFR 808.1 - Public hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Public hearings. 808.1... ENFORCEMENT ACTIONS Conduct of Hearings § 808.1 Public hearings. (a) A public hearing shall be conducted in... Commission regulations. (b) A public hearing may be conducted by the Commission in any form or style...

  16. 18 CFR 808.1 - Public hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 18 Conservation of Power and Water Resources 2 2011-04-01 2011-04-01 false Public hearings. 808.1... ENFORCEMENT ACTIONS Conduct of Hearings § 808.1 Public hearings. (a) A public hearing shall be conducted in... Commission regulations. (b) A public hearing may be conducted by the Commission in any form or style...

  17. 42 CFR 431.222 - Group hearings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 4 2010-10-01 2010-10-01 false Group hearings. 431.222 Section 431.222 Public... Recipients Right to Hearing § 431.222 Group hearings. The agency— (a) May respond to a series of individual requests for hearing by conducting a single group hearing; (b) May consolidate hearings only in cases...

  18. 42 CFR 431.222 - Group hearings.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 4 2011-10-01 2011-10-01 false Group hearings. 431.222 Section 431.222 Public... Recipients Right to Hearing § 431.222 Group hearings. The agency— (a) May respond to a series of individual requests for hearing by conducting a single group hearing; (b) May consolidate hearings only in cases...

  19. A stably enhanced transparent conductive graphene film obtained using an air-annealing method

    NASA Astrophysics Data System (ADS)

    Song, Xuefen; Wei, Dapeng; Sun, Tai; Yu, Leyong; Yang, Jun; Zhang, Yongna; Fang, Liang; Wei, Dacheng; Shi, Haofei; Du, Chunlei

    2016-08-01

    A simple and effective air-annealing technique was developed to stably improve both the electrical conductivity and light transmission of pristine graphene. After the graphene film was annealed in air at 250 °C for 80 min, the mobility and carrier concentration were both significantly enhanced, and the sheet resistance was greatly reduced with a decrease rate of ∼33%. Meanwhile, the transparency was also improved by more than 3%. The mechanism is carefully discussed. The reason might be that air-annealing conditions provide a suitable atmosphere to etch and remove amorphous carbons. More importantly, the enhanced transparent conductive properties of the air-annealed graphene films were extraordinarily stable, and remained almost unchanged for 100 days.

  20. Hybrid Air Quality Modeling Approach for use in the Hear-road Exposures to Urban air pollutant Study(NEXUS)

    EPA Science Inventory

    The paper presents a hybrid air quality modeling approach and its application in NEXUS in order to provide spatial and temporally varying exposure estimates and identification of the mobile source contribution to the total pollutant exposure. Model-based exposure metrics, associa...

  1. Loading of osseointegrated implants for bone conduction hearing at 3 weeks: 3-year stability, survival, and tolerability.

    PubMed

    Nelissen, Rik C; den Besten, Christine A; Faber, Hubert T; Dun, Catharina A J; Mylanus, Emmanuel A M; Hol, Myrthe K S

    2016-07-01

    The objective of this study was to ascertain the long-term safety of loading osseointegrated implants for bone conduction hearing 3 weeks post-surgery. Thirty consecutive adult patients were implanted with the Baha BI300 (Cochlear Bone Anchored Solutions) in our tertiary referral center. Implants were loaded with the sound processor 3 weeks post-surgery. Follow-up examinations were performed at 10 days; 3, 4, 6, 8, and 12 weeks; 6 months; and 1, 2, and 3 years after implant surgery. At each follow-up visit, implant stability quotient (ISQ) values were recorded by means of resonance frequency analysis, and soft tissue status was evaluated according to Holgers' classification. ISQ trends, implant survival, and soft tissue reactions were compared to a population of 52 patients with the same type of implants loaded from 6 weeks post-surgery as part of another study. Subjective benefit was measured by means of the Glasgow Benefit Inventory (GBI). After an initial dip in ISQ at 10 days after implantation, a gradually increasing trend in ISQ was found until 6 months in both populations, after which ISQ values remained above baseline values. Implant survival was 97 % in the study population and 96 % in the comparison population. Clinically relevant soft tissue reactions were found in 0.9 % (study population) and 1.7 % (comparison population) of all visits. Patients reported subjective benefit; the mean GBI score was 22.8. In conclusion, loading these implants at 3 weeks post-surgery is safe based on the current study, as long-term results show high ISQ values and good implant survival and tolerability. PMID:26272679

  2. Bone Anchored Hearing Aid

    PubMed Central

    2002-01-01

    conditions were successfully treated with antibiotics, and only 1% to 2% required surgical revision. Less than 1% required removal of the fixture. Other complications included failure to osseointegrate and loss of fixture and/or abutment due to trauma or infection. Effectiveness Studies showed that BAHAs were implanted in people who have conduction or mixed hearing loss, congenital atresia or suppurative otitis media who were not candidates for surgical repair, and who cannot use conventional bone conduction hearing aids. The need for BAHA is not age- related. Objective audiometric measures and subjective patient satisfaction surveys showed that BAHA significantly improved the unaided and aided free field and sound field thresholds as well as speech discrimination in quiet and in noise for former users of conventional bone conduction hearing aids. The outcomes were ambiguous for former users of air conduction hearing aids. BAHA has been shown to reduce the frequency of ear infection and reduce the discharge particularly among patients with suppurative otitis media. Patients have reported that BAHA improved their quality of life. Reported benefits were improved speech intelligibility, better sound comfort, less pressure on the head, less skin irritation, greater cosmetic acceptance and increase in confidence. Main reported shortcomings were wind noise, feedback and difficulty in using the telephone. Experts and the BAHA manufacturer recommended that recipients of a BAHA implant be at least 5 years old. Challenges associated with the implantation of BAHA in pediatric patients include thin bone, soft bone, higher rates of fixture loss due to trauma, psychological problems, and higher revision rates due to rapid bone growth. The overall outcomes are comparable to adult BAHA. The benefits of pediatric BAHA (e.g. on speech development) appear to outweigh the disadvantages. Screening according to strict eligibility criteria, preoperative counselling, close monitoring by a physician

  3. Deafness and Hearing Loss.

    ERIC Educational Resources Information Center

    National Information Center for Children and Youth with Disabilities, Washington, DC.

    This brief overview provides information on the definition, incidence, and characteristics of children with hearing impairments and deafness. The federal definitions of hearing impairment and deafness are provided. The different types of hearing loss are noted, including: (1) conductive (caused by diseases or obstructions in the outer or middle…

  4. Hearing Loss

    MedlinePlus

    ... version of this page please turn Javascript on. Hearing Loss What is Hearing Loss? Hearing loss is a common problem caused by ... sec Click to watch this video Types of Hearing Loss Hearing loss comes in many forms. It can ...

  5. Experimental Analysis of the Mechanism of Hearing under Water

    PubMed Central

    Chordekar, Shai; Kishon-Rabin, Liat; Kriksunov, Leonid; Adelman, Cahtia; Sohmer, Haim

    2015-01-01

    The mechanism of human hearing under water is debated. Some suggest it is by air conduction (AC), others by bone conduction (BC), and others by a combination of AC and BC. A clinical bone vibrator applied to soft tissue sites on the head, neck, and thorax also elicits hearing by a mechanism called soft tissue conduction (STC) or nonosseous BC. The present study was designed to test whether underwater hearing at low intensities is by AC or by osseous BC based on bone vibrations or by nonosseous BC (STC). Thresholds of normal hearing participants to bone vibrator stimulation with their forehead in air were recorded and again when forehead and bone vibrator were under water. A vibrometer detected vibrations of a dry human skull in all similar conditions (in air and under water) but not when water was the intermediary between the sound source and the skull forehead. Therefore, the intensities required to induce vibrations of the dry skull in water were significantly higher than the underwater hearing thresholds of the participants, under conditions when hearing by AC and osseous BC is not likely. The results support the hypothesis that hearing under water at low sound intensities may be attributed to nonosseous BC (STC). PMID:26770975

  6. 4 CFR 21.7 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... or on its own initiative, GAO may conduct a hearing in connection with a protest. The request shall set forth the reasons why a hearing is needed to resolve the protest. (b) Prior to the hearing, GAO.... Although hearings ordinarily will be conducted at GAO in Washington, DC, hearings may, at the discretion...

  7. 40 CFR 60.2141 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection? 60.2141 Section 60.2141 Protection of Environment... Compliance Requirements § 60.2141 By what date must I conduct the initial air pollution control device inspection? (a) The initial air pollution control device inspection must be conducted within 60 days...

  8. 40 CFR 60.2706 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection? 60.2706 Section 60.2706 Protection of Environment... Requirements § 60.2706 By what date must I conduct the initial air pollution control device inspection? (a) The initial air pollution control device inspection must be conducted within 60 days after installation of...

  9. 40 CFR 60.4895 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Compliance Requirements § 60.4895 By what date must I conduct annual air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution... following the previous annual air pollution control device inspection. (b) Within 10 operating...

  10. 40 CFR 60.4895 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Compliance Requirements § 60.4895 By what date must I conduct annual air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution... following the previous annual air pollution control device inspection. (b) Within 10 operating...

  11. 40 CFR 60.2141 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection? 60.2141 Section 60.2141 Protection of Environment... Compliance Requirements § 60.2141 By what date must I conduct the initial air pollution control device inspection? (a) The initial air pollution control device inspection must be conducted within 60 days...

  12. 40 CFR 60.4895 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Compliance Requirements § 60.4895 By what date must I conduct annual air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution... following the previous annual air pollution control device inspection. (b) Within 10 operating...

  13. 40 CFR 60.4895 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Compliance Requirements § 60.4895 By what date must I conduct annual air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution... following the previous annual air pollution control device inspection. (b) Within 10 operating...

  14. Report of the Council on Environmental Quality. Hearing Before the Subcommittee on Air and Water Pollution of the Committee on Public Works, 91st Congress, Second Session, August 11, 1970.

    ERIC Educational Resources Information Center

    Congress of the U.S., Washington, DC. Senate Committee on Public Works.

    Presented in this bulletin is the text of the hearing before the Subcommittee on Air and Water Pollution of the Committee on Public Works, United States Senate concerning the "First Annual Environmental Quality Report" of the Council on Environmental Quality. The hearing was held August 11, 1970 for the purpose of providing open discussion of the…

  15. Performance and cycle life of carbon- and conductive-based air electrodes for rechargeable Zn-air battery applications

    NASA Astrophysics Data System (ADS)

    Chellapandi Velraj, Samgopiraj

    The development of high-performance, cyclically stable bifunctional air electrodes are critical to the commercial deployment of rechargeable Zn-air batteries. The carbon material predominantly used as support material in the air electrodes due to its higher surface area and good electrical conductivity suffers from corrosion at high oxygen evolution overpotentials. This study addresses the carbon corrosion issues and suggests alternate materials to replace the carbon as support in the air electrode. In this study, Sm0.5Sr0.5CoO3-delta with good electrochemical performance and cyclic lifetime was identified as an alternative catalyst material to the commonly used La0.4Ca 0.6CoO3 catalyst for the carbon-based bifunctional electrodes. Also, a comprehensive study on the effects of catalyst morphology, testing conditions on the cycle life as well as the relevant degradation mechanism for the carbon-based electrode was conducted in this dissertation. The cyclic life of the carbon-based electrodes was strongly dependent on the carbon support material, while the degradation mechanisms were entirely controlled by the catalyst particle size/morphology. Some testing conditions like resting time and electrolyte concentration did not change the cyclic life or degradation mechanism of the carbon-based electrode. The current density used for cyclic testing was found to dictate the degradation mechanism leading to the electrode failure. An alternate way to circumvent the carbon corrosion is to replace the carbon support with a suitable electrically-conductive ceramic material. In this dissertation, LaNi0.9Mn0.1O3, LaNi 0.8Co0.2O3, and NiCo2O4 were synthesized and evaluated as prospective support materials due to their good electrical conductivity and their ability to act as the catalyst needed for the bifunctional electrode. The carbon-free electrodes had remarkably higher catalytic activity for oxygen evolution reaction (OER) when compared to the carbon-based electrode. However

  16. A study of hear sink performance in air and soil for use in a thermoelectric energy harvesting device

    NASA Technical Reports Server (NTRS)

    Snyder, J.; Lawrence, E. E.

    2002-01-01

    A suggested application of a thermoelectric generator is to exploit the natural temperature difference between the air and the soil to generate small amounts of electrical energy. Since the conversion efficiency of even the best thermoelectric generators available is very low, the performance of the heat sinks providing the heat flow is critical. By providing a constant heat input to various heat sinks, field tests of their thermal conductances in soil and in air were performed. Aprototype device without a thermoelectric generator was constructed, buried, and monitored to experimentally measure the heat flow achievable in such a system. Theoretical considerations for design and selection of improved heat sinks are also presented. In particular, the method of shape factoranalysis is used to give rough estimates and upper bounds for the thermal conductance of a passive heat sink buried in soil.

  17. Microstructure and DC electrical conductivity of spinel nickel ferrite sintered in air and nitrogen atmospheres

    SciTech Connect

    Liu, Baogang; Zhou, Kechao; Li, Zhiyou; Zhang, Dou; Zhang, Lei

    2010-11-15

    In recent years, the development of inert anode materials has gained considerable attention because such materials are capable of producing only environment-friendly O{sub 2} and saving energy during aluminum electrolysis. Nickel ferrite was prepared by a solid-state reaction as the inert anode in this study and its microstructures and direct current conductivities were analyzed in detail regarding the effects of different sintering atmospheres. A single-phase spinel structure was confirmed for all samples by X-ray powder diffraction. The grain sizes and the relative densities of the samples sintered in nitrogen increased by over 7 {mu}m and 10.8%, respectively, compared to those sintered in air. The direct current conductivities of the samples sintered in nitrogen showed a drastic increase compared to those sintered in air, believed to be due to the effects of increased Fe{sup 2+} ion concentration at octahedral sites and the increase of the relative density.

  18. 17 CFR 204.38 - Pre-offset hearing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... form and content of hearings granted under this section, pursuant to 31 CFR 901.3(e). All oral hearings... and persuasion. (c) The hearing official shall: (1) Conduct a fair and impartial hearing; (2)...

  19. 17 CFR 204.38 - Pre-offset hearing.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... form and content of hearings granted under this section, pursuant to 31 CFR 901.3(e). All oral hearings... and persuasion. (c) The hearing official shall: (1) Conduct a fair and impartial hearing; (2)...

  20. 17 CFR 204.38 - Pre-offset hearing.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... form and content of hearings granted under this section, pursuant to 31 CFR 901.3(e). All oral hearings... and persuasion. (c) The hearing official shall: (1) Conduct a fair and impartial hearing; (2)...

  1. 17 CFR 204.38 - Pre-offset hearing.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... form and content of hearings granted under this section, pursuant to 31 CFR 901.3(e). All oral hearings... and persuasion. (c) The hearing official shall: (1) Conduct a fair and impartial hearing; (2)...

  2. 17 CFR 204.38 - Pre-offset hearing.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... form and content of hearings granted under this section, pursuant to 31 CFR 901.3(e). All oral hearings... and persuasion. (c) The hearing official shall: (1) Conduct a fair and impartial hearing; (2)...

  3. 34 CFR 668.88 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 34 Education 3 2011-07-01 2011-07-01 false Hearing. 668.88 Section 668.88 Education Regulations of... Proceedings § 668.88 Hearing. (a) A hearing is an orderly presentation of arguments and evidence conducted by a hearing official. (b) If the hearing official, the designated department official who brought...

  4. 34 CFR 668.88 - Hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 3 2010-07-01 2010-07-01 false Hearing. 668.88 Section 668.88 Education Regulations of... Proceedings § 668.88 Hearing. (a) A hearing is an orderly presentation of arguments and evidence conducted by a hearing official. (b) If the hearing official, the designated department official who brought...

  5. 7 CFR 400.132 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 6 2011-01-01 2011-01-01 false Hearings. 400.132 Section 400.132 Agriculture... Years § 400.132 Hearings. (a) If an employee timely files a petition for a hearing, the FCIC Official will select the date, time, and location for the hearing. (b) The hearing shall be conducted by...

  6. 42 CFR 422.1040 - Joint hearings.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 3 2012-10-01 2012-10-01 false Joint hearings. 422.1040 Section 422.1040 Public....1040 Joint hearings. When two or more affected parties have requested hearings and the same or... the prehearing conference or hearing and conduct all proceedings jointly. If joint hearings are...

  7. 42 CFR 423.1040 - Joint hearings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Joint hearings. 423.1040 Section 423.1040 Public... § 423.1040 Joint hearings. When two or more affected parties have requested hearings and the same or... the prehearing conference or hearing and conduct all proceedings jointly. If joint hearings are...

  8. 42 CFR 422.1040 - Joint hearings.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 3 2014-10-01 2014-10-01 false Joint hearings. 422.1040 Section 422.1040 Public....1040 Joint hearings. When two or more affected parties have requested hearings and the same or... the prehearing conference or hearing and conduct all proceedings jointly. If joint hearings are...

  9. 42 CFR 423.1040 - Joint hearings.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 3 2011-10-01 2011-10-01 false Joint hearings. 423.1040 Section 423.1040 Public... § 423.1040 Joint hearings. When two or more affected parties have requested hearings and the same or... the prehearing conference or hearing and conduct all proceedings jointly. If joint hearings are...

  10. 42 CFR 422.1040 - Joint hearings.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 3 2013-10-01 2013-10-01 false Joint hearings. 422.1040 Section 422.1040 Public....1040 Joint hearings. When two or more affected parties have requested hearings and the same or... the prehearing conference or hearing and conduct all proceedings jointly. If joint hearings are...

  11. 22 CFR 34.15 - Outside hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... the origin, nature, and amount of the debt; (ii) The hearing official's findings, analysis, and... hearings shall be conducted by a hearing official not under the supervision or control of STATE. (c) Procedure. (1) After the employee requests a hearing, the hearing official shall notify the employee of...

  12. Smartphone-based hearing test as an aid in the initial evaluation of unilateral sudden sensorineural hearing loss.

    PubMed

    Handzel, Ophir; Ben-Ari, Oded; Damian, Doris; Priel, Maayan M; Cohen, Jacob; Himmelfarb, Mordechai

    2013-01-01

    Sudden sensorineural hearing loss (SSNHL) can cause significant morbidity. Treatment with steroids can improve outcome. Delay in initiation of treatment reduces the chance to regain hearing. For this reason SSNHL is considered an emergency. Diagnosis is based on history, physical examination and a standard audiogram, the latter requiring specialized equipment and personnel. Standard audiogram may not be available at the time and place of patient presentation. A smartphone or tablet computer-based hearing test may aid in the decision to prescribe steroids in this setting. In this study the uHear™ hearing test application was utilized. The output of this ear-level air conduction hearing test is reported in hearing grades for 6 frequencies ranging from 250 to 6000 Hz. A total of 32 patients with unilateral SSNHL proven by a standard audiogram were tested. The results of standard and iPod hearing tests were compared. Based on the accepted criterion of SSNHL (at least 30 dB loss - or 2 hearing grades - in 3 consecutive frequencies) the test had a sensitivity of 0.76 and specificity of 0.91. Using a less stringent criterion of a loss of 2 hearing grades over at least 2 frequencies the sensitivity was 0.96 and specificity 0.86. The correlation coefficient for the comparison of the average hearing grade across the 6 measured frequencies of the study and standard audiogram was 0.83. uHear more accurately reflected hearing thresholds at mid and high tones. Similarly to previously published data, low frequency thresholds could be artificially elevated. In conclusion, uHear can be useful in the initial evaluation of patients with single-sided SSNHL by providing important information guiding the decision to initiate treatment before a standard audiogram is available. PMID:23689282

  13. 40 CFR 60.5215 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution control device used to comply with the emission limits, according to § 60.5220(c), no later than 12 months following the previous annual air pollution control...

  14. 40 CFR 60.5215 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution control device used to comply with the emission limits, according to § 60.5220(c), no later than 12 months following the previous annual air pollution control...

  15. 40 CFR 60.2151 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection? 60.2151 Section 60.2151 Protection of Environment... Compliance Requirements § 60.2151 By what date must I conduct the annual air pollution control device inspection? On an annual basis (no more than 12 months following the previous annual air pollution...

  16. 40 CFR 60.2151 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection? 60.2151 Section 60.2151 Protection of Environment... Compliance Requirements § 60.2151 By what date must I conduct the annual air pollution control device inspection? On an annual basis (no more than 12 months following the previous annual air pollution...

  17. 40 CFR 60.2716 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection? 60.2716 Section 60.2716 Protection of Environment... Requirements § 60.2716 By what date must I conduct the annual air pollution control device inspection? On an annual basis (no more than 12 months following the previous annual air pollution control...

  18. 40 CFR 60.5215 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution control device used to comply with the emission limits, according to § 60.5220(c), no later than 12 months following the previous annual air pollution control...

  19. 40 CFR 60.5215 - By what date must I conduct annual air pollution control device inspections and make any...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspections and make any necessary repairs? (a) You must conduct an annual inspection of each air pollution control device used to comply with the emission limits, according to § 60.5220(c), no later than 12 months following the previous annual air pollution control...

  20. Hearing loss and the high speed dental handpiece.

    PubMed Central

    Zubick, H H; Tolentino, A T; Boffa, J

    1980-01-01

    A pure tone air conduction audiometric evaluation was administered to 137 dentists and 80 physicians. The physicians were found to have better hearing threshold levels, notably in the 4000HZ center frequency range. The left ear of right handed dentists showed a greater loss of hearing ostensibly related to proximity to the noise source. Dental specialists showed a loss pattern similar to those of the general dentists. The findings suggest that there may be a cause and effect relationship between hearing loss and use of the highspeed dental handpiece. PMID:6990802

  1. Aqueous and air-compatible fabrication of high-performance conductive textiles.

    PubMed

    Wang, Xiaolong; Yan, Casey; Hu, Hong; Zhou, Xuechang; Guo, Ruisheng; Liu, Xuqing; Xie, Zhuang; Huang, Zhifeng; Zheng, Zijian

    2014-08-01

    This paper describes a fully aqueous- and air-compatible chemical approach to preparing high-performance conductive textiles. In this method, the surfaces of textile materials are first modified with an aqueous solution of double-bond-containing silane molecules to form a surface-anchoring layer for subsequent in situ free-radical polymerization of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) in the air. Thin layers of poly-METAC (PMETAC) are therefore covalently grafted on top of the silane-modified textile surface. Cu- or Ni-coated textiles are finally fabricated by electroless deposition (ELD) onto the PMETAC-modified textiles. Parameters including polymerization time, temperature, and ELD conditions are studied to optimize the whole fabrication process. The as-made conductive textiles exhibit sheet resistance as low as 0.2 Ω sq(-1) , which makes them highly suitable for use as conductive wires and interconnects in flexible and wearable electronic devices. More importantly, the chemical method is fully compatible with the conventional "pad-dry-cure" fabrication process in the textile manufacturing industry, thus indicating that it is very promising for high-throughput and roll-to-roll fabrication of high-performance metal-coated conductive textiles in the future. PMID:24867263

  2. Patterning process and actuation in open air of micro-beam actuator based on conducting IPNs

    NASA Astrophysics Data System (ADS)

    Khaldi, Alexandre; Plesse, Cédric; Soyer, Caroline; Chevrot, Claude; Teyssié, Dominique; Vidal, Frédéric; Cattan, Eric

    2012-04-01

    We report on new method to obtain micrometric electroactive polymer actuators operating in air. High speed conducting Interpenetrating Polymer Network (IPN) microactuators are synthesized and fully characterized. The IPN architecture used in this work allows solving the interface and adhesion problems, which have been reported in the design of classical conducting polymer-based actuators. We demonstrated that it is possible to reduce the thickness of these actuators by a specific synthetic pathway. IPN host matrixes based on polyethylene oxide / polytetrahydrofurane have been shaped by hot pressing. Then, the resulting thin host matrixes (below 10 μm) are compatible with the microfabrication technologies. After interpenetration of poly(3,4-ethylenedioxythiophene) (PEDOT), these electroactive materials are micro-sized using dry etching process. Frequency responses and displacement have been characterized by scanning electronic microscopy. These conducting IPN microactuators can be considered as potential candidates in numerous low frequency applications, including micro-valves, micro-optical instrumentation and micro-robotics.

  3. NanoCapillary Network Proton Conducting Membranes for High Temperature Hydrogen/Air Fuel Cells

    SciTech Connect

    Pintauro, Peter

    2012-07-09

    The objective of this proposal is to fabricate and characterize a new class of NanoCapillary Network (NCN) proton conducting membranes for hydrogen/air fuel cells that operate under high temperature, low humidity conditions. The membranes will be intelligently designed, where a high density interconnecting 3-D network of nm-diameter electrospun proton conducting polymer fibers is embedded in an inert (uncharged) water/gas impermeable polymer matrix. The high density of fibers in the resulting mat and the high ion-exchange capacity of the fiber polymer will ensure high proton conductivity. To further enhance water retention, molecular silica will be added to the sulfonated polymer fibers. The uncharged matrix material will control water swelling of the high ion-exchange capacity proton conducting polymer fibers and will impart toughness to the final nanocapillary composite membrane. Thus, unlike other fuel cell membranes, the role of the polymer support matrix will be decoupled from that of the proton-conducting channels. The expected final outcome of this 5-year project is the fabrication of fuel cell membranes with properties that exceed the DOE’s technical targets, in particular a proton conductivity of 0.1 S/cm at a temperature less than or equal to120°C and 25-50% relative humidity.

  4. Instability of an interface between air and a low conducting liquid subjected to charge injection

    NASA Astrophysics Data System (ADS)

    Chicón, Rafael; Pérez, Alberto T.

    2006-10-01

    We study the linear stability of an interface between air and a low conducting liquid in the presence of unipolar injection of charge. As a consequence of charge injection, a volume charge density builds up in the air gap and a surface charge density on the interface. Above a certain voltage threshold the electrical stresses may destabilize the interface, giving rise to a characteristic cell pattern known as rose-window instability. Contrary to what occurs in the classical volume electrohydrodynamic instability in insulating liquids, the typical cell size is several times larger than the liquid depth. We analyze the linear stability through the usual procedure of decomposing an arbitrary perturbation into normal modes. The resulting homogeneous linear system of ordinary differential equations is solved using a commercial software package. Finally, an analytical method is developed that provides a solution valid in the limit of small wavenumbers.

  5. Mathematical equations for heat conduction in the fins of air-cooled engines

    NASA Technical Reports Server (NTRS)

    Harper, R R; Brown, W B

    1923-01-01

    The problem considered in this report is that of reducing actual geometrical area of fin-cooling surface, which is, of course, not uniform in temperature, to equivalent cooling area at one definite temperature, namely, that prevailing on the cylinder wall at the point of attachment of the fin. This makes it possible to treat all the cooling surface as if it were part of the cylinder wall and 100 per cent effective. The quantities involved in the equations are the geometrical dimensions of the fin, thermal conductivity of the material composing it, and the coefficient of surface heat dissipation between the fin and the air streams.

  6. 32 CFR 723.5 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 5 2011-07-01 2011-07-01 false Hearing. 723.5 Section 723.5 National Defense... § 723.5 Hearing. (a) Convening of board. The Board will convene, recess and adjourn at the call of the Chair or Acting Chair. (b) Conduct of hearing. (1) The hearing shall be conducted by the Chair or...

  7. 49 CFR 240.409 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Hearings. 240.409 Section 240.409 Transportation... Hearings. (a) An administrative hearing for a locomotive engineer qualification petition shall be conducted... conduct of the hearing for the purpose of achieving a prompt and fair determination of all material...

  8. 49 CFR 240.409 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 49 Transportation 4 2011-10-01 2011-10-01 false Hearings. 240.409 Section 240.409 Transportation... Hearings. (a) An administrative hearing for a locomotive engineer qualification petition shall be conducted... conduct of the hearing for the purpose of achieving a prompt and fair determination of all material...

  9. 20 CFR 416.1415 - Disability hearing-disability hearing officers.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 20 Employees' Benefits 2 2014-04-01 2014-04-01 false Disability hearing-disability hearing... Reopening of Determinations and Decisions Reconsideration § 416.1415 Disability hearing—disability hearing officers. (a) General. Your disability hearing will be conducted by a disability hearing officer who...

  10. 20 CFR 416.1415 - Disability hearing-disability hearing officers.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 20 Employees' Benefits 2 2011-04-01 2011-04-01 false Disability hearing-disability hearing... Reopening of Determinations and Decisions Reconsideration § 416.1415 Disability hearing—disability hearing officers. (a) General. Your disability hearing will be conducted by a disability hearing officer who...

  11. 20 CFR 416.1415 - Disability hearing-disability hearing officers.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 20 Employees' Benefits 2 2012-04-01 2012-04-01 false Disability hearing-disability hearing... Reopening of Determinations and Decisions Reconsideration § 416.1415 Disability hearing—disability hearing officers. (a) General. Your disability hearing will be conducted by a disability hearing officer who...

  12. 20 CFR 416.1415 - Disability hearing-disability hearing officers.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 20 Employees' Benefits 2 2013-04-01 2013-04-01 false Disability hearing-disability hearing... Reopening of Determinations and Decisions Reconsideration § 416.1415 Disability hearing—disability hearing officers. (a) General. Your disability hearing will be conducted by a disability hearing officer who...

  13. 20 CFR 416.1415 - Disability hearing-disability hearing officers.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 20 Employees' Benefits 2 2010-04-01 2010-04-01 false Disability hearing-disability hearing... Reopening of Determinations and Decisions Reconsideration § 416.1415 Disability hearing—disability hearing officers. (a) General. Your disability hearing will be conducted by a disability hearing officer who...

  14. A comparison of the nonlinear response of the ear to air and to bone-conducted sound.

    PubMed

    Clavier, O H; Norris, J A; Dietz, A J

    2010-05-01

    The nonlinear response of the ear to air-conducted sound has been studied to some depth. However, the nonlinear response of the ear to bone-conducted sound has received less attention. A comparison of the nonlinear response of humans to air and bone-conducted sound is presented. Two different human subject test techniques were combined in this investigation. The first was a psychoacoustic investigation measuring the perceived cancellation of a bone-conducted sound stimulus with another air-conducted sound stimulus. The measurement was accomplished through a loudness-matching technique. The second investigation used distortion product otoacoustic emissions (DPOAEs) to make objective measurements of the response of the ear to both air-conducted sound and bone-conducted sound. The results were compared to determine whether the measured compression effects were similar for the different types of stimuli. Results show that both the measured psychoacoustic response and the measured objective response of the ear to air-conducted sound and to bone-conducted sound were similar at 2 and 4kHz. PMID:20227477

  15. Deep rooting plants influence on soil hydraulic properties and air conductivity over time

    NASA Astrophysics Data System (ADS)

    Uteau, Daniel; Peth, Stephan; Diercks, Charlotte; Pagenkemper, Sebastian; Horn, Rainer

    2014-05-01

    Crop sequences are commonly suggested as an alternative to improve subsoil structure. A well structured soil can be characterized by enhanced transport properties. Our main hypothesis was, that different root systems can modify the soil's macro/mesopore network if enough cultivation time is given. We analyzed the influence of three crops with either shallower roots (Festuca arundinacea, fescue) or taproots (Cichorium intybus, chicory and Medicago sativa, alfalfa). The crops where cultivated on a Haplic Luvisol near Bonn (Germany) for one, two or three years. Undisturbed soil cores were taken for measurement of unsaturated hydraulic conductivity and air permeability. The unsaturated conductivity was measured using the evaporation method, monitoring the water content and tension at two depths of each undisturbed soil core. The van Genuchten-Mualem model (1991) was fitted to the measured data. Air permeability was measured in a permeameter with constant flow at low pressure gradient. The measurements were repeated at -1, -3, -6, -15, -30 and -50 kPa matric tension and the model of Ball et al. (1988) was used to describe permeability as function of matric tension. Furthermore, the cores equilibrated at -15 kPa matric tension were scanned with X-Ray computer tomography. By means of 3D image analysis, geometrical features as pore size distribution, tortuosity and connectivity of the pore network was analyzed. The measurements showed an increased unsaturated hydraulic conductivity associated to coarser pores at the taprooted cultivations. A enhanced pore system (related to shrink-swell processes) under alfalfa was observed in both transport measurements and was confirmed by the 3D image analysis. This highly functional pore system (consisting mainly of root paths, earthworm channels and shrinking cracks) was clearly visible below the 75 cm of depth and differentiated significantly from the other two treatments only after three years of cultivation, which shows the time

  16. An Alternative to Impedance Screening: Unoccluded Frontal Bone Conduction Screening.

    ERIC Educational Resources Information Center

    Square, Regina; And Others

    1985-01-01

    A bone conduction hearing screening test using frontal bone oscillator placement was compared with pure-tone air-conduction screening and impedance audiometry with 114 preschoolers. Unoccluded frontal bone conduction testing produced screening results not significantly different from results obtained by impedance audiometry. (CL)!

  17. Hearing Aids

    MedlinePlus

    ... more in both quiet and noisy situations. Hearing aids help people who have hearing loss from damage ... your doctor. There are different kinds of hearing aids. They differ by size, their placement on or ...

  18. Hearing Problems

    MedlinePlus

    ... This flow chart will help direct you if hearing loss is a problem for you or a family ... may damage the inner ear. This kind of hearing loss is called OCCUPATIONAL. Prevent occupational hearing loss by ...

  19. Hearing Loss

    MedlinePlus

    ... Devices Can Help? Hearing aids. Hearing aids are electronic, battery-run devices that make sounds louder. There ... to turn up the volume. Cochlear implants. These electronic devices are for people with severe hearing loss. ...

  20. 18 CFR 808.4 - Optional joint hearing.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 18 Conservation of Power and Water Resources 2 2011-04-01 2011-04-01 false Optional joint hearing... HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.4 Optional joint hearing. (a) The Commission may... agent pursuant to such additional designation and may conduct joint hearings for the Commission and...

  1. 18 CFR 808.4 - Optional joint hearing.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 18 Conservation of Power and Water Resources 2 2012-04-01 2012-04-01 false Optional joint hearing... HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.4 Optional joint hearing. (a) The Commission may... agent pursuant to such additional designation and may conduct joint hearings for the Commission and...

  2. 18 CFR 808.4 - Optional joint hearing.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 18 Conservation of Power and Water Resources 2 2013-04-01 2012-04-01 true Optional joint hearing... HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.4 Optional joint hearing. (a) The Commission may... agent pursuant to such additional designation and may conduct joint hearings for the Commission and...

  3. 18 CFR 808.4 - Optional joint hearing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Optional joint hearing... HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.4 Optional joint hearing. (a) The Commission may... agent pursuant to such additional designation and may conduct joint hearings for the Commission and...

  4. Effect of floating conducting objects on critical switching impulse breakdown of air insulation

    SciTech Connect

    Rizk, F.A.M.

    1995-07-01

    The paper analyses the mechanism of breakdown of phase-to-ground and phase-to-phase air insulation in the presence of large conducting floating objects, under critical switching impulse stress. A new physical modeling approach is introduced which involves determination of the potential of the floating object by charge simulation technique, assessment of streamer breakdown and/or leader inception and propagation in the partial gaps and finally predicts the critical breakdown voltage of various configurations. As to phase-to-ground insulation, the investigation covers rod-plane, conductor-plane and conductor-tower leg configurations with different gap spacings as well as different shapes, dimensions and positions of the floating object. The phase-to-phase study additionally includes the effect of negative switching impulse content of the applied stress. The model is in excellent agreement with experiment and provides a novel tool for assessment of the effect of floating objects on switching impulse breakdown of some basic air gap configurations relevant to live line work.

  5. Fluid volume displacement at the oval and round windows with air and bone conduction stimulation

    NASA Astrophysics Data System (ADS)

    Stenfelt, Stefan; Hato, Naohito; Goode, Richard L.

    2004-02-01

    The fluids in the cochlea are normally considered incompressible, and the fluid volume displacement of the oval window (OW) and the round window (RW) should be equal and of opposite phase. However, other channels, such as the cochlear and vestibular aqueducts, may affect the fluid flow. To test if the OW and RW fluid flows are equal and of opposite phase, the volume displacement was assessed by multiple point measurement at the windows with a laser Doppler vibrometer. This was done during air conduction (AC) stimulation in seven fresh human temporal bones, and with bone conduction (BC) stimulation in eight temporal bones and one human cadaver head. With AC stimulation, the average volume displacement of the two windows is within 3 dB, and the phase difference is close to 180° for the frequency range 0.1 to 10 kHz. With BC stimulation, the average volume displacement difference between the two windows is greater: below 2 kHz, the volume displacement at the RW is 5 to 15 dB greater than at the OW and above 2 kHz more fluid is displaced at the OW. With BC stimulation, lesions at the OW caused only minor changes of the fluid flow at the RW.

  6. Air cooling of a vented enclosure by combined conduction, natural convection and radiation

    SciTech Connect

    Yu, E.; Joshi, Y.K.

    1996-12-31

    A three-dimensional investigation of combined conduction, natural convection and radiation in vented enclosures is carried out. A discrete flush type heat source mounted on a vertical substrate is used to simulate an electronic component. A uniform volumetric generation rate is assumed within the heat source. Combined natural convection in the air, conduction in the heat source, the substrate and the enclosure walls, and surface radiation are solved for Rayleigh numbers at 2.6 {times} 10{sup 6} and 2.0 {times} 10{sup 7}. Radiation is incorporated based on the radiosity/irradiation approach. The resulting flow and temperature patterns are discussed, focusing on radiation and three-dimensional effects. The relative contributions of natural convection and radiation are investigated for different emissivities of internal surface of the substrate. Heat transfer rates from the substrate and other internal walls are presented to illustrate conjugate heat transfer due to combined modes. The numerical solutions are found in reasonably good agreement with the data.

  7. Effect of High-Pass Filtering on the Neonatal Auditory Brainstem Response to Air- and Bone-Conducted Clicks.

    ERIC Educational Resources Information Center

    Stuart, Andrew; Yang, Edward Y.

    1994-01-01

    Simultaneous 3- channel recorded auditory brainstem responses (ABR) were obtained from 20 neonates with various high-pass filter settings and low intensity levels. Results support the advocacy of less restrictive high-pass filtering for neonatal and infant ABR screening to air-conducted and bone-conducted clicks. (Author/JDD)

  8. 12 CFR 509.301 - Hearing procedures.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... procedures. (a) Hearings. The following procedures apply to hearings under 12 CFR part 585. (1) The hearing... counsel and the applicant. (4) 12 CFR 509.2, 509.4, 509.6 through 509.12, and 509.16 apply to the hearing... the proceeding is being conducted. Witness fees are paid in accordance with 12 CFR 509.14. (9)...

  9. 12 CFR 509.301 - Hearing procedures.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... procedures. (a) Hearings. The following procedures apply to hearings under 12 CFR part 585. (1) The hearing... counsel and the applicant. (4) 12 CFR 509.2, 509.4, 509.6 through 509.12, and 509.16 apply to the hearing... the proceeding is being conducted. Witness fees are paid in accordance with 12 CFR 509.14. (9)...

  10. 34 CFR 668.116 - Hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 3 2010-07-01 2010-07-01 false Hearing. 668.116 Section 668.116 Education Regulations... Program Review Determinations § 668.116 Hearing. (a) A hearing is a process conducted by the hearing official whereby an orderly presentation of arguments and evidence is made by the parties. (b) The...

  11. 34 CFR 668.116 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 34 Education 3 2011-07-01 2011-07-01 false Hearing. 668.116 Section 668.116 Education Regulations... Program Review Determinations § 668.116 Hearing. (a) A hearing is a process conducted by the hearing official whereby an orderly presentation of arguments and evidence is made by the parties. (b) The...

  12. 12 CFR 268.108 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 12 Banks and Banking 3 2010-01-01 2010-01-01 false Hearings. 268.108 Section 268.108 Banks and... REGARDING EQUAL OPPORTUNITY Board Program To Promote Equal Opportunity § 268.108 Hearings. (a) When a complainant requests a hearing, the Commission shall appoint an administrative judge to conduct a hearing...

  13. 76 FR 66126 - Notice of Public Hearing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-25

    ... Federal Railroad Administration Notice of Public Hearing The Central Oregon and Pacific Railroad (CORP... the carrier's proposal and the available facts, FRA has determined that a public hearing is necessary... participate in a public hearing on December 1, 2011. The hearing will be conducted at the Douglas...

  14. 7 CFR 900.115 - Hearing.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 8 2010-01-01 2010-01-01 false Hearing. 900.115 Section 900.115 Agriculture... Hearing. (a) The arbitrator shall have full discretion to conduct the hearing in such manner as will, in..., and other experts. (h) When more than two arbitrators are designated to hear a dispute, and...

  15. 7 CFR 900.115 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 8 2011-01-01 2011-01-01 false Hearing. 900.115 Section 900.115 Agriculture... Hearing. (a) The arbitrator shall have full discretion to conduct the hearing in such manner as will, in..., and other experts. (h) When more than two arbitrators are designated to hear a dispute, and...

  16. 39 CFR 953.5 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 39 Postal Service 1 2011-07-01 2011-07-01 false Hearings. 953.5 Section 953.5 Postal Service... Hearings. (a) In general, admissibility of evidence at hearings conducted under this part hinges on... the rulings of the presiding officer made during the course of the hearing are unnecessary. For...

  17. 44 CFR 68.4 - Hearing board.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 44 Emergency Management and Assistance 1 2010-10-01 2010-10-01 false Hearing board. 68.4 Section 68.4 Emergency Management and Assistance FEDERAL EMERGENCY MANAGEMENT AGENCY, DEPARTMENT OF HOMELAND... § 68.4 Hearing board. (a) Each hearing shall be conducted by a three member hearing board...

  18. 42 CFR 423.1040 - Joint hearings.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 3 2014-10-01 2014-10-01 false Joint hearings. 423.1040 Section 423.1040 Public... Penalties § 423.1040 Joint hearings. When two or more affected parties have requested hearings and the same... and place for the prehearing conference or hearing and conduct all proceedings jointly. If...

  19. 42 CFR 423.1040 - Joint hearings.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 3 2013-10-01 2013-10-01 false Joint hearings. 423.1040 Section 423.1040 Public... Penalties § 423.1040 Joint hearings. When two or more affected parties have requested hearings and the same... and place for the prehearing conference or hearing and conduct all proceedings jointly. If...

  20. 42 CFR 423.1040 - Joint hearings.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 3 2012-10-01 2012-10-01 false Joint hearings. 423.1040 Section 423.1040 Public... Penalties § 423.1040 Joint hearings. When two or more affected parties have requested hearings and the same... and place for the prehearing conference or hearing and conduct all proceedings jointly. If...

  1. 20 CFR 30.723 - How will the administrative law judge conduct the hearing and issue the recommended decision?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... appropriate, proceedings before the administrative law judge shall be governed by 29 CFR part 18. (b) The... 20 Employees' Benefits 1 2010-04-01 2010-04-01 false How will the administrative law judge conduct... WORKERS' COMPENSATION PROGRAMS, DEPARTMENT OF LABOR ENERGY EMPLOYEES OCCUPATIONAL ILLNESS...

  2. Hearing Screening

    ERIC Educational Resources Information Center

    Johnson-Curiskis, Nanette

    2012-01-01

    Hearing levels are threatened by modern life--headsets for music, rock concerts, traffic noises, etc. It is crucial we know our hearing levels so that we can draw attention to potential problems. This exercise requires that students receive a hearing screening for their benefit as well as for making the connection of hearing to listening.

  3. 75 FR 1566 - Public Hearings for Reconsideration of the 2008 National Ambient Air Quality Standards for Ozone

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-12

    ... the following Web site: http://www.epa.gov/ttn/naaqs/standards/ozone/s_o3_cr_fr.html for the addresses.../standards/ozone/s_o3_cr_fr.html . FOR FURTHER INFORMATION CONTACT: If you would like to speak at the public... proposal at http://www.epa.gov/ttn/naaqs/standards/ozone/s_o3_cr_fr.html prior to the hearings....

  4. 24 CFR 81.84 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...) Hearings shall be conducted by a HUD ALJ authorized to conduct proceedings under 24 CFR part 26, subpart B.... Hearings shall be conducted in accordance with the procedures set forth in 24 CFR part 26, subpart B to the... 24 Housing and Urban Development 1 2011-04-01 2011-04-01 false Hearings. 81.84 Section...

  5. Cumulative Lead Exposure and Age-related Hearing Loss: The VA Normative Aging Study

    PubMed Central

    Park, Sung Kyun; Elmarsafawy, Sahar; Mukherjee, Bhramar; Spiro, Avron; Vokonas, Pantel S.; Nie, Huiling; Weisskopf, Marc G.; Schwartz, Joel; Hu, Howard

    2010-01-01

    Although lead has been associated with hearing loss in occupational settings and in children, little epidemiologic research has been conducted on the impact of cumulative lead exposure on age-related hearing loss in the general population. We determined whether bone lead levels, a marker of cumulative lead exposure, are associated with decreased hearing ability in 448 men from the Normative Aging Study, seen between 1962 and 1996 (2,264 total observations). Air conduction hearing thresholds were measured at 0.25 to 8 kHz and pure tone averages (PTA) (mean of 0.5, 1, 2 and 4 kHz) were computed. Tibia and patella lead levels were measured using K x-ray fluorescence between 1991 and 1996. In cross-sectional analyses, after adjusting for potential confounders including occupational noise, patella lead levels were significantly associated with poorer hearing thresholds at 2, 3, 4, 6 and 8 kHz and PTA. The odds of hearing loss significantly increased with patella lead levels. We also found significant positive associations between tibia lead and the rate change in hearing thresholds at 1, 2, and 8 kHz and PTA in longitudinal analyses. Our results suggest that chronic low-level lead exposure may be an important risk factor for age-related hearing loss and reduction of lead exposure could help prevent or delay development of age-related hearing loss. PMID:20638461

  6. 77 FR 39205 - Public Hearings for Proposed Rules-National Ambient Air Quality Standards for Particulate Matter

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-02

    ... Quality Standards for Particulate Matter AGENCY: Environmental Protection Agency (EPA). ACTION... titled, ``National Ambient Air Quality Standards for Particulate Matter,'' that is scheduled to be... and secondary national ambient air quality standards (NAAQS) for particulate matter (PM) to...

  7. Hearing Levels of Children by Demographic and Socioeconomic Characteristics, United States.

    ERIC Educational Resources Information Center

    National Center for Health Statistics (DHEW/PHS), Hyattsville, MD.

    Reported were estimates of hearing levels of noninstitutionalized children aged 6 to 11 years in the United States in relation to their demographic and socioeconomic background. Findings are results of individual monaural pure-tone air-conduction audiometric tests, conducted as part of the Health Examination Survey of 1963-65. In the survey 7,119…

  8. Air

    MedlinePlus

    ... do to protect yourself from dirty air . Indoor air pollution and outdoor air pollution Air can be polluted indoors and it can ... this chart to see what things cause indoor air pollution and what things cause outdoor air pollution! Indoor ...

  9. EPA's Implementation of Laws Regulating Asbestos Hazards in Schools and in the Air. Hearing before a Subcommittee of the Committee on Government Operations. House of Representatives, One Hundredth Congress, Second Session.

    ERIC Educational Resources Information Center

    Congress of the U. S., Washington, DC. House Committee on Government Operations.

    A hearing was held by the Subcommittee on Environment, Energy, and Natural Resources on the Environmental Protection Agency's (EPA) implementation of laws regulating asbestos hazards in schools and in the air. Presented are testimony as well as letters and statements submitted for the record by leading authorities in the area including: (1) James…

  10. Temperature and strain rate effects in high strength high conductivity copper alloys tested in air

    SciTech Connect

    Edwards, D.J.

    1998-03-01

    The tensile properties of the three candidate alloys GlidCop{trademark} Al25, CuCrZr, and CuNiBe are known to be sensitive to the testing conditions such as strain rate and test temperature. This study was conducted on GlidCop Al25 (2 conditions) and Hycon 3HP (3 conditions) to ascertain the effect of test temperature and strain rate when tested in open air. The results show that the yield strength and elongation of the GlidCop Al25 alloys exhibit a strain rate dependence that increases with temperature. Both the GlidCop and the Hycon 3 HP exhibited an increase in strength as the strain rate increased, but the GlidCop alloys proved to be the most strain rate sensitive. The GlidCop failed in a ductile manner irrespective of the test conditions, however, their strength and uniform elongation decreased with increasing test temperature and the uniform elongation also decreased dramatically at the lower strain rates. The Hycon 3 HP alloys proved to be extremely sensitive to test temperature, rapidly losing their strength and ductility when the temperature increased above 250 C. As the test temperature increased and the strain rate decreased the fracture mode shifted from a ductile transgranular failure to a ductile intergranular failure with very localized ductility. This latter observation is based on the presence of dimples on the grain facets, indicating that some ductile deformation occurred near the grain boundaries. The material failed without any reduction in area at 450 C and 3.9 {times} 10{sup {minus}4} s{sup {minus}1}, and in several cases failed prematurely.

  11. 40 CFR 60.4875 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.4875 Section 60.4875... Initial Compliance Requirements § 60.4875 By what date must I conduct the initial air pollution control device inspection and make any necessary repairs? (a) You must conduct an air pollution control...

  12. 40 CFR 60.4875 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.4875 Section 60.4875... Initial Compliance Requirements § 60.4875 By what date must I conduct the initial air pollution control device inspection and make any necessary repairs? (a) You must conduct an air pollution control...

  13. 40 CFR 60.4875 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.4875 Section 60.4875... Initial Compliance Requirements § 60.4875 By what date must I conduct the initial air pollution control device inspection and make any necessary repairs? (a) You must conduct an air pollution control...

  14. 40 CFR 60.4875 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.4875 Section 60.4875... Initial Compliance Requirements § 60.4875 By what date must I conduct the initial air pollution control device inspection and make any necessary repairs? (a) You must conduct an air pollution control...

  15. 40 CFR 60.5195 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.5195 Section 60.5195... air pollution control device inspection and make any necessary repairs? (a) You must conduct an air... approved state plan, Federal plan, or delegation, as applicable. For air pollution control...

  16. 40 CFR 60.5195 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.5195 Section 60.5195... air pollution control device inspection and make any necessary repairs? (a) You must conduct an air... approved state plan, Federal plan, or delegation, as applicable. For air pollution control...

  17. 40 CFR 60.5195 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.5195 Section 60.5195... air pollution control device inspection and make any necessary repairs? (a) You must conduct an air... approved state plan, Federal plan, or delegation, as applicable. For air pollution control...

  18. 40 CFR 60.5195 - By what date must I conduct the initial air pollution control device inspection and make any...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection and make any necessary repairs? 60.5195 Section 60.5195... air pollution control device inspection and make any necessary repairs? (a) You must conduct an air... approved state plan, Federal plan, or delegation, as applicable. For air pollution control...

  19. Hearing Aids

    MedlinePlus

    ... type and degree of loss. Are there different styles of hearing aids? Styles of hearing aids Source: NIH/NIDCD Behind-the- ... the ear canal and are available in two styles. The in-the-canal (ITC) hearing aid is ...

  20. The role of biological system other than auditory air-conduction in the emergence of the hypersonic effect.

    PubMed

    Oohashi, Tsutomu; Kawai, Norie; Nishina, Emi; Honda, Manabu; Yagi, Reiko; Nakamura, Satoshi; Morimoto, Masako; Maekawa, Tadao; Yonekura, Yoshiharu; Shibasaki, Hiroshi

    2006-02-16

    Although human beings cannot perceive elastic vibrations in the frequency range above 20 kHz, nonstationary sounds containing a wealth of inaudible high-frequency components (HFC) above the human audible range activate deep-lying brain structures, including the brainstem and thalamus and evoke various physiological, psychological, and behavioral responses. In the previous reports, we have called these phenomena collectively "the hypersonic effect." It remains unclear, however, if vibratory stimuli above the audible range are transduced and perceived solely via the conventional air-conducting auditory system or if other mechanisms also contribute to mediate transduction and perception. In the present study, we have examined the emergence of the hypersonic effect when inaudible HFC and audible low-frequency components (LFC) were presented selectively to the ears, the entrance of an air-conducting auditory system, or to the body surface including the head which might contain some unknown vibratory sensing mechanisms. We used two independent measurements based on differing principles; one physiological (alpha 2 frequency of spontaneous electroencephalogram [alpha-EEG]) and the other behavioral (the comfortable listening level [CLL]). Only when the listener's entire body surface was exposed to HFC, but not when HFC was presented exclusively to the air-conducting auditory system, did both the alpha-EEG and the CLL significantly increase compared to the presentation of LFC alone, that is to say, there was an evident emergence of the hypersonic effect. The present findings suggest that the conventional air-conducting auditory system alone does not bring about the hypersonic effect. We may need to consider the possible involvement of a biological system distinct from the conventional air-conducting auditory nervous system in sensing and transducing high-frequency elastic vibration above the human audible range. PMID:16458271

  1. Lower responsiveness of canopy evapotranspiration rate than of leaf stomatal conductance to open-air CO2 elevation in rice.

    PubMed

    Shimono, Hiroyuki; Nakamura, Hirofumi; Hasegawa, Toshihiro; Okada, Masumi

    2013-08-01

    An elevated atmospheric CO2 concentration ([CO2 ]) can reduce stomatal conductance of leaves for most plant species, including rice (Oryza sativa L.). However, few studies have quantified seasonal changes in the effects of elevated [CO2 ] on canopy evapotranspiration, which integrates the response of stomatal conductance of individual leaves with other responses, such as leaf area expansion, changes in leaf surface temperature, and changes in developmental stages, in field conditions. We conducted a field experiment to measure seasonal changes in stomatal conductance of the uppermost leaves and in the evapotranspiration, transpiration, and evaporation rates using a lysimeter method. The study was conducted for flooded rice under open-air CO2 elevation. Stomatal conductance decreased by 27% under elevated [CO2 ], averaged throughout the growing season, and evapotranspiration decreased by an average of 5% during the same period. The decrease in daily evapotranspiration caused by elevated [CO2 ] was more significantly correlated with air temperature and leaf area index (LAI) rather than with other parameters of solar radiation, days after transplanting, vapor-pressure deficit and FAO reference evapotranspiration. This indicates that higher air temperatures, within the range from 16 to 27 °C, and a larger LAI, within the range from 0 to 4 m(2)  m(-2) , can increase the magnitude of the decrease in evapotranspiration rate caused by elevated [CO2 ]. The crop coefficient (i.e. the evapotranspiration rate divided by the FAO reference evapotranspiration rate) was 1.24 at ambient [CO2 ] and 1.17 at elevated [CO2 ]. This study provides the first direct measurement of the effects of elevated [CO2 ] on rice canopy evapotranspiration under open-air conditions using the lysimeter method, and the results will improve future predictions of water use in rice fields. PMID:23564676

  2. Hearing Loss: Diagnosis and Evaluation.

    PubMed

    Zazove, Philip; Atcherson, Samuel R; Moreland, Christopher; McKee, Michael M

    2015-07-01

    Hearing loss is a common disability in the United States, most frequent among men, elderly individuals, and veterans but is increasingly affecting other younger adults. Types of hearing loss include sensorineural, conductive, and mixed. Hearing loss in children often is related to infections, time spent in a neonatal intensive care unit, and genetic etiologies. Presbycusis (ie, age-related hearing loss) is the most common etiology in adults. Adverse effects of untreated hearing loss include isolation, depression, lower income, and higher unemployment. Hearing aid use reduces levels of disability, cognitive impairment, and psychosocial distress while improving quality of life. At least 75% of individuals with hearing loss are not receiving treatment for it. All infants should be screened for hearing loss, as should children and adults with risk factors. The Joint Commission on Infant Hearing Screening has a 1-3-6 goal for screening: identification by age 1 month, confirmation by age 3 months, and intervention by age 6 months. The presence of an ongoing physician-patient relationship increases the likelihood that a patient will admit to having a hearing loss. Adults can be screened using single-question or standardized instrument screens. All patients with suspected hearing loss should undergo audiometry by an audiology subspecialist. PMID:26161523

  3. Hearing aid fitting in older persons with hearing impairment: the influence of cognitive function, age, and hearing loss on hearing aid benefit

    PubMed Central

    Meister, Hartmut; Rählmann, Sebastian; Walger, Martin; Margolf-Hackl, Sabine; Kießling, Jürgen

    2015-01-01

    Purpose To examine the association of cognitive function, age, and hearing loss with clinically assessed hearing aid benefit in older hearing-impaired persons. Methods Hearing aid benefit was assessed using objective measures regarding speech recognition in quiet and noisy environments as well as a subjective measure reflecting everyday situations captured using a standardized questionnaire. A broad range of general cognitive functions such as attention, memory, and intelligence were determined using different neuropsychological tests. Linear regression analyses were conducted with the outcome of the neuropsychological tests as well as age and hearing loss as independent variables and the benefit measures as dependent variables. Thirty experienced older hearing aid users with typical age-related hearing impairment participated. Results Most of the benefit measures revealed that the participants obtained significant improvement with their hearing aids. Regression models showed a significant relationship between a fluid intelligence measure and objective hearing aid benefit. When individual hearing thresholds were considered as an additional independent variable, hearing loss was the only significant contributor to the benefit models. Lower cognitive capacity – as determined by the fluid intelligence measure – was significantly associated with greater hearing loss. Subjective benefit could not be predicted by any of the variables considered. Conclusion The present study does not give evidence that hearing aid benefit is critically associated with cognitive function in experienced hearing aid users. However, it was found that lower fluid intelligence scores were related to higher hearing thresholds. Since greater hearing loss was associated with a greater objective benefit, these results strongly support the advice of using hearing aids regardless of age and cognitive function to counter hearing loss and the adverse effects of age-related hearing impairment. Still

  4. Hearing: Noise-Induced Hearing Loss

    MedlinePlus

    MENU Return to Web version Hearing: Noise-Induced Hearing Loss Hearing: Noise-Induced Hearing Loss The importance of hearing Hearing allows you to ... surround the soft tissue of the inner ear. Hearing loss occurs when the inner ear is damaged. What ...

  5. Air-Stable, High-Conduction Solid Electrolytes of Arsenic-Substituted Li4SnS4

    SciTech Connect

    Sahu, Gayatri; Lin, Zhan; Li, Juchuan; Liu, Zengcai; Dudney, Nancy J; Liang, Chengdu

    2014-01-01

    Lithium-ion-conducting solid electrolytes show promise for enabling high-energy secondary battery chemistries and solving safety issues associated with conventional lithium batteries. Achieving the combination of high ionic conductivity and outstanding chemical stability in solid electrolytes is a grand challenge for the synthesis of solid electrolytes. Herein we report the design of aliovalent substitution of Li4SnS4 to achieve high conduction and excellent air stability based on the hard and soft acids and bases theory. The composition of Li3.833Sn0.833As 0.166S4 has a high ionic conductivity of 1.39 mS/cm 1 at 25 C. Considering the high Li+ transference number, this phase conducts Li+ as well as carbonate-based liquid electrolytes. This research also addresses the compatibility of the sulfide-based solid electrolytes through chemical passivation.

  6. Underwater Hearing in Turtles.

    PubMed

    Willis, Katie L

    2016-01-01

    The hearing of turtles is poorly understood compared with the other reptiles. Although the mechanism of transduction of sound into a neural signal via hair cells has been described in detail, the rest of the auditory system is largely a black box. What is known is that turtles have higher hearing thresholds than other reptiles, with best frequencies around 500 Hz. They also have lower underwater hearing thresholds than those in air, owing to resonance of the middle ear cavity. Further studies demonstrated that all families of turtles and tortoises share a common middle ear cavity morphology, with scaling best suited to underwater hearing. This supports an aquatic origin of the group. Because turtles hear best under water, it is important to examine their vulnerability to anthropogenic noise. However, the lack of basic data makes such experiments difficult because only a few species of turtles have published audiograms. There are also almost no behavioral data available (understandable due to training difficulties). Finally, few studies show what kinds of sounds are behaviorally relevant. One notable paper revealed that the Australian snake-necked turtle (Chelodina oblonga) has a vocal repertoire in air, at the interface, and under water. Findings like these suggest that there is more to the turtle aquatic auditory scene than previously thought. PMID:26611091

  7. 40 CFR 85.1807 - Public hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Public hearings. 85.1807 Section 85.1807 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF AIR POLLUTION FROM MOBILE SOURCES Recall Regulations § 85.1807 Public hearings. (a) Definitions. The following definitions shall...

  8. 40 CFR 92.709 - Public hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 20 2014-07-01 2013-07-01 true Public hearings. 92.709 Section 92.709 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES Recall Regulations § 92.709 Public hearings. (a) Definitions. The following...

  9. Wind Direction Bias in Generating Wind Roses and Conducting Sector-Based Air-Dispersion Modeling

    SciTech Connect

    Droppo, James G.; Napier, Bruce A.

    2008-07-01

    Certain widely used wind rose programs and air dispersion models use an overly-simple data-transfer algorithm that induces a directional bias in their output products. The purpose of this paper is to provide a revised algorithm that corrects the aliasing bias that occurs when the internals in reported wind direction data are on the same order of magnitude, but not equal to the intervals used in the wind direction summaries. The directional bias issue arises when output products in 22.5-degree sectors are produced from 10-degree wind direction data, which affects the results of simulations of air and surface concentrations using widely applied air-dispersion models. Datasets or models with the bias discussed here give consistent positive biases (approximately 30%) for cardinal direction sectors (north, south, east, and west) and consistent negative biases for all the other sectors (approximately -10%). Data summary and air dispersion programs providing outputs in directions sectors that do not match the observational sectors need to be checked for this bias. A revised data-transfer algorithm is provided that corrects the aliasing bias that can occur in transferring wind direction data between different sectors widths.

  10. The Stigma of Hearing Loss

    ERIC Educational Resources Information Center

    Wallhagen, Margaret I.

    2010-01-01

    Purpose: To explore dimensions of stigma experienced by older adults with hearing loss and those with whom they frequently communicate to target interventions promoting engagement and positive aging. Design and Methods: This longitudinal qualitative study conducted interviews over 1 year with dyads where one partner had hearing loss. Participants…

  11. An overview of the Noncyanide Metal Stripper program conducted at Kelly Air Force Base

    SciTech Connect

    Argyle, M.D.; Cowan, R.L.

    1995-01-01

    The Noncyanide Metal Stripper Program was a waste minimization effort aimed at identifying and testing suitable noncyanide stripping solutions that could replace the cyanide stripping solutions found in the United States Air Force (USAF) Air Logistics Centers (ALC). The program started with laboratory testing of commercial stripping solutions. The performance of these solutions was compared with the cyanide process solutions C-101 and C-106 targeted for replacement. Plate metal stripping rate, basis metal corrosion, and compatibility with masking materials and biodegradability were all used to determine the performance of each product. Those products that passed the acceptance criteria were field tested using 25 to 50-gallon solutions to determine optimum operating conditions, stripper maintenance requirements, and maximum solution loading and longevity. The program included investigating any adverse effects these new products might have on existing chemical and biological waste treatment processes. All cyanide stripping solutions at the San Antonio Air Logistics Command Center have been successfully replaced with commercial noncyanide products. Generally, these replacements were less toxic and generated less waste and had longer lifetimes than their cyanide counterparts.

  12. Ozone nonattainment under the Clean Air Act. Hearing before the Subcommittee on Technology, Environment and Aviation of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred Third Congress, Second Session, July 8, 1994

    SciTech Connect

    1994-12-31

    The hearing addresses ozone nonattainment under the Clean Air Act. Southeastern Wisconsin is a designated ozone non-attainment area under amendments to the Act of 1990. Preliminary results of a Lake Michigan Ozone study seem to indicate that much of the pollution causing high levels of ozone come from several hundred miles away. The witnesses examine plans to cope with this situation. Statements of government and industry officials are included along with documents submitted for the record.

  13. Stability, Survival, and Tolerability of an Auditory Osseointegrated Implant for Bone Conduction Hearing: Long-Term Follow-Up of a Randomized Controlled Trial

    PubMed Central

    den Besten, Christine A.; Stalfors, Joacim; Wigren, Stina; Blechert, Johan Ivarsson; Flynn, Mark; Eeg-Olofsson, Måns; Aggarwal, Rohini; Green, Kevin; Nelissen, Rik C.; Mylanus, Emmanuel A. M.; Hol, Myrthe K. S.

    2016-01-01

    Objective: To compare implant stability, survival, and soft tissue reactions for a novel (test) and previous generation (control) percutaneous auditory osseointegrated implant for bone conduction hearing at long-term follow-up of 5 years. Study Design: Single follow-up visit of a previously completed multicenter, randomized, controlled trial. Patients: Fifty-seven of the 77 participants of a completed randomized controlled trial on a new auditory osseointegrated implant underwent a single follow-up visit 5 years after implantation, which comprised implant stability measurements and collection of Holgers scores. Additionally, implant survival was recorded for all 77 patients from the original trial. Results: The test implant showed significantly higher implant stability quotient (ISQ) values compared with the control implant throughout the 5-year follow-up. Mean area under the curve of ISQ high from baseline to 5 years was 71.6 (standard deviation [SD] ±2.0) and 66.7 (SD ±3.4) for the test and control implant, respectively (p < 0.0001). For both implants, the mean ISQ value recorded at 5 years was higher compared with implantation (test group +2.03 [SD ±2.55, within group p < 0.0001] and control group +2.25 [SD ±4.95, within group p = 0.12]). No difference was noticed in increase from baseline between groups (p = 0.64). Furthermore, evaluation of soft tissue reactions continued to show superiority of the test implant. At the 5-year follow-up visit, one patient (2.5%) presented with a Holgers grade 2 in the test group, compared with four patients (23.5%) in the control group (p = 0.048); no patient presented with more severe soft tissue reactions. Excluding explantations, the survival rate was 95.8% for the test group and 95.0% for the control group. The corresponding rates including explantations were 93.9 and 90.0%. Conclusion: The test implant showed superiority in terms of higher mean ISQ values and less adverse soft tissue reactions, both

  14. 10 CFR 710.25 - Appointment of Hearing Officer; prehearing conference; commencement of hearings.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... or other automated systems in possession of the subpoenaed person. (e) The Hearing Officer will... conference will usually be conducted by telephone. (g) Hearings shall commence within 90 calendar days...

  15. A Classical Conditioning Procedure for the Hearing Assessment of Multiply Handicapped Persons.

    ERIC Educational Resources Information Center

    Lancioni, Giulio E.; And Others

    1989-01-01

    Hearing assessments of multiply handicapped children/adolescents were conducted using classical conditioning (with an air puff as unconditioned stimulus) and operant conditioning (with a modified visual reinforcement audiometry procedure or edible reinforcement). Findings indicate that classical conditioning was successful with 21 of the 23…

  16. Prevalence of Hearing Loss in Black and White Elders: Results of the Cardiovascular Health Study

    ERIC Educational Resources Information Center

    Pratt, Sheila R.; Kuller, Lewis; Talbott, Evelyn O.; McHugh-Pemu, Kathleen; Buhari, Alhaji M.; Xu, Xiaohui

    2009-01-01

    Purpose: The goal of this study was to determine the impact of age, gender, and race on the prevalence and severity of hearing loss in elder adults, aged 72-96 years, after accounting for income, education, smoking, and clinical and subclinical cardiovascular disease. Methods: Air-conduction thresholds for standard and extended high-frequency…

  17. 29 CFR 101.10 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Hearings. 101.10 Section 101.10 Labor Regulations Relating... Section 10 (a) to (i) of the Act and Telegraph Merger Act Cases § 101.10 Hearings. (a) Except in extraordinary situations the hearing is open to the public and usually conducted in the Region where the...

  18. 10 CFR 820.29 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 4 2011-01-01 2011-01-01 false Hearing. 820.29 Section 820.29 Energy DEPARTMENT OF ENERGY PROCEDURAL RULES FOR DOE NUCLEAR ACTIVITIES Enforcement Process § 820.29 Hearing. (a) General. Except as otherwise provided by this part or the Presiding Officer, a hearing shall be conducted in accordance...

  19. 29 CFR 1980.107 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 9 2010-07-01 2010-07-01 false Hearings. 1980.107 Section 1980.107 Labor Regulations... Hearings. (a) Except as provided in this part, proceedings will be conducted in accordance with the rules of practice and procedure for administrative hearings before the Office of Administrative Law...

  20. 39 CFR 965.8 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 39 Postal Service 1 2011-07-01 2011-07-01 false Hearings. 965.8 Section 965.8 Postal Service....8 Hearings. (a) Generally, mail dispute cases are resolved based on written submissions. However, in the discretion of the presiding officer an oral hearing may be conducted where in the opinion of...

  1. 29 CFR 1981.107 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 9 2010-07-01 2010-07-01 false Hearings. 1981.107 Section 1981.107 Labor Regulations... ACT OF 2002 Litigation § 1981.107 Hearings. (a) Except as provided in this part, proceedings will be conducted in accordance with the rules of practice and procedure for administrative hearings before...

  2. 24 CFR 30.95 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... Administrative Procedure Act, set forth in 24 CFR part 26. ... 24 Housing and Urban Development 1 2011-04-01 2011-04-01 false Hearings. 30.95 Section 30.95... MONEY PENALTIES: CERTAIN PROHIBITED CONDUCT Procedures § 30.95 Hearings. Hearings under this part...

  3. 24 CFR 28.40 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Hearings. 28.40 Section 28.40 Housing and Urban Development Office of the Secretary, Department of Housing and Urban Development IMPLEMENTATION OF THE PROGRAM FRAUD CIVIL REMEDIES ACT OF 1986 § 28.40 Hearings. (a) General. Hearings under this part shall be conducted in accordance...

  4. 42 CFR 422.1040 - Joint hearings.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 3 2011-10-01 2011-10-01 false Joint hearings. 422.1040 Section 422.1040 Public...) MEDICARE PROGRAM MEDICARE ADVANTAGE PROGRAM Appeal procedures for Civil Money Penalties § 422.1040 Joint... conference or hearing and conduct all proceedings jointly. If joint hearings are held, a single record of...

  5. 42 CFR 422.1040 - Joint hearings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Joint hearings. 422.1040 Section 422.1040 Public...) MEDICARE PROGRAM MEDICARE ADVANTAGE PROGRAM Appeal procedures for Civil Money Penalties § 422.1040 Joint... conference or hearing and conduct all proceedings jointly. If joint hearings are held, a single record of...

  6. 45 CFR 96.66 - Hearing procedure.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 45 Public Welfare 1 2012-10-01 2012-10-01 false Hearing procedure. 96.66 Section 96.66 Public Welfare DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATION BLOCK GRANTS Hearing Procedure § 96... disclosure. (b) A hearing will be conducted by the presiding officer. Employees of the Department will...

  7. 42 CFR 93.517 - The hearing.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 1 2014-10-01 2014-10-01 false The hearing. 93.517 Section 93.517 Public Health... Process § 93.517 The hearing. (a) The ALJ will conduct an in-person hearing to decide if the respondent committed research misconduct and if the HHS administrative actions, including any debarment or...

  8. 42 CFR 93.517 - The hearing.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 1 2011-10-01 2011-10-01 false The hearing. 93.517 Section 93.517 Public Health... Process § 93.517 The hearing. (a) The ALJ will conduct an in-person hearing to decide if the respondent committed research misconduct and if the HHS administrative actions, including any debarment or...

  9. 42 CFR 93.517 - The hearing.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false The hearing. 93.517 Section 93.517 Public Health... Process § 93.517 The hearing. (a) The ALJ will conduct an in-person hearing to decide if the respondent committed research misconduct and if the HHS administrative actions, including any debarment or...

  10. 42 CFR 93.517 - The hearing.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 1 2013-10-01 2013-10-01 false The hearing. 93.517 Section 93.517 Public Health... Process § 93.517 The hearing. (a) The ALJ will conduct an in-person hearing to decide if the respondent committed research misconduct and if the HHS administrative actions, including any debarment or...

  11. 31 CFR 8.63 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 31 Money and Finance: Treasury 1 2011-07-01 2011-07-01 false Hearings. 8.63 Section 8.63 Money and... AND FIREARMS Disciplinary Proceedings § 8.63 Hearings. (a) Conduct. The Administrative Law Judge shall preside at the hearing on a complaint for the disbarment or suspension of an attorney, certified...

  12. 24 CFR 30.95 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... Administrative Procedure Act, set forth in 24 CFR part 26. ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Hearings. 30.95 Section 30.95... MONEY PENALTIES: CERTAIN PROHIBITED CONDUCT Procedures § 30.95 Hearings. Hearings under this part...

  13. Hearing Assistive Technology

    MedlinePlus

    ... for the Public / Hearing and Balance Hearing Assistive Technology Hearing Assistive Technology: FM Systems | Infrared Systems | Induction ... Assistive Technology Systems Solutions What are hearing assistive technology systems (HATS)? Hearing assistive technology systems (HATS) are ...

  14. Hearing Benefit in Allograft Tympanoplasty Using Tutoplast Processed Malleus

    PubMed Central

    Issing, Wolfgang

    2014-01-01

    Objectives. Tutoplast processed human cadaveric ossicular allografts are a safe alternative for ossicular reconstruction where there is insufficient material suitable for autograft ossiculoplasty. We present a series of 7 consecutive cases showing excellent air-bone gap closure following canal-wall-down mastoidectomy for cholesteatoma and reconstruction of the middle ear using Tutoplast processed malleus. Patients and Methods. Tympanoplasty with Tutoplast processed malleus was performed in seven patients to reconstruct the middle ear following canal-wall-down mastoidectomy in a tertiary ENT centre. Main Outcome Measures. Hearing improvement and recurrence-free period were assessed. Pre-and postoperative audiograms were performed. Results. The average pre operative hearing loss was 50 ± 13 dB, with an air-bone gap of 33 ± 7 dB. Post operative audiograms at 25 months demonstrated hearing thresholds of 29 ± 10 dB, with an air-bone gap of 14 ± 6 dB. No prosthesis extrusion was observed, which compares favourably to other commercially available prostheses. Conclusions. Tutoplast processed allografts restore conductive hearing loss in patients undergoing mastoidectomy and provide an excellent alternative when there is insufficient material suitable for autograft ossiculoplasty. PMID:24688548

  15. Performance of a combined three-hole conductivity probe for void fraction and velocity measurement in air-water flows

    NASA Astrophysics Data System (ADS)

    Borges, João Eduardo; Pereira, Nuno H. C.; Matos, Jorge; Frizell, Kathleen H.

    2010-01-01

    The development of a three-hole pressure probe with back-flushing combined with a conductivity probe, used for measuring simultaneously the magnitude and direction of the velocity vector in complex air-water flows, is described in this paper. The air-water flows envisaged in the current work are typically those occurring around the rotors of impulse hydraulic turbines (like the Pelton and Cross-Flow turbines), where the flow direction is not known prior to the data acquisition. The calibration of both the conductivity and three-hole pressure components of the combined probe in a rig built for the purpose, where the probe was placed in a position similar to that adopted for the flow measurements, will be reported. After concluding the calibration procedure, the probe was utilized in the outside region of a Cross-Flow turbine rotor. The experimental results obtained in the present study illustrate the satisfactory performance of the combined probe, and are encouraging toward its use for characterizing the velocity field of other complex air-water flows.

  16. In-air hearing of a diving duck: A comparison of psychoacoustic and auditory brainstem response thresholds.

    PubMed

    Crowell, Sara E; Wells-Berlin, Alicia M; Therrien, Ronald E; Yannuzzi, Sally E; Carr, Catherine E

    2016-05-01

    Auditory sensitivity was measured in a species of diving duck that is not often kept in captivity, the lesser scaup. Behavioral (psychoacoustics) and electrophysiological [the auditory brainstem response (ABR)] methods were used to measure in-air auditory sensitivity, and the resulting audiograms were compared. Both approaches yielded audiograms with similar U-shapes and regions of greatest sensitivity (2000-3000 Hz). However, ABR thresholds were higher than psychoacoustic thresholds at all frequencies. This difference was least at the highest frequency tested using both methods (5700 Hz) and greatest at 1000 Hz, where the ABR threshold was 26.8 dB higher than the behavioral measure of threshold. This difference is commonly reported in studies involving many different species. These results highlight the usefulness of each method, depending on the testing conditions and availability of the animals. PMID:27250191

  17. Thermal Conductivity and Erosion Durability of Composite Two-Phase Air Plasma Sprayed Thermal Barrier Coatings

    NASA Technical Reports Server (NTRS)

    Schmitt, Michael P.; Rai, Amarendra K.; Zhu, Dongming; Dorfman, Mitchell R.; Wolfe, Douglas E.

    2015-01-01

    To enhance efficiency of gas turbines, new thermal barrier coatings (TBCs) must be designed which improve upon the thermal stability limit of 7 wt% yttria stabilized zirconia (7YSZ), approximately 1200 C. This tenant has led to the development of new TBC materials and microstructures capable of improved high temperature performance. This study focused on increasing the erosion durability of cubic zirconia based TBCs, traditionally less durable than the metastable t' zirconia based TBCs. Composite TBC microstructures composed of a low thermal conductivity/high temperature stable cubic Low-k matrix phase and a durable t' Low-k secondary phase were deposited via APS. Monolithic coatings composed of cubic Low-k and t' Low-k were also deposited, in addition to a 7YSZ benchmark. The thermal conductivity and erosion durability were then measured and it was found that both of the Low-k materials have significantly reduced thermal conductivities, with monolithic t' Low-k and cubic Low-k improving upon 7YSZ by approximately 13 and approximately 25%, respectively. The 40 wt% t' Low-k composite (40 wt% t' Low-k - 60 wt% cubic Low-k) showed a approximately 22% reduction in thermal conductivity over 7YSZ, indicating even at high levels, the t' Low-k secondary phase had a minimal impact on thermal in the composite coating. It was observed that a mere 20 wt% t' Low-k phase addition can reduce the erosion of a cubic Low-k matrix phase composite coating by over 37%. Various mixing rules were then investigated to assess this non-linear composite behavior and suggestions were made to further improve erosion durability.

  18. 28 CFR 2.23 - Delegation to hearing examiners.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... may be conducted by a single examiner or by a panel of examiners. A Executive Hearing Examiner shall function as a hearing examiner for the purpose of obtaining a panel recommendation whenever the Regional... a hearing examiner and the Executive Hearing Examiner, shall be required to obtain a...

  19. 10 CFR 1040.123 - Consolidated or joint hearings.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 4 2014-01-01 2014-01-01 false Consolidated or joint hearings. 1040.123 Section 1040.123... ACTIVITIES Enforcement Opportunity for Hearing § 1040.123 Consolidated or joint hearings. In cases in which... departments or agencies, where applicable, provide for the conduct of consolidated or joint hearings and...

  20. 10 CFR 1040.123 - Consolidated or joint hearings.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 4 2013-01-01 2013-01-01 false Consolidated or joint hearings. 1040.123 Section 1040.123... ACTIVITIES Enforcement Opportunity for Hearing § 1040.123 Consolidated or joint hearings. In cases in which... departments or agencies, where applicable, provide for the conduct of consolidated or joint hearings and...

  1. 10 CFR 1040.123 - Consolidated or joint hearings.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 4 2012-01-01 2012-01-01 false Consolidated or joint hearings. 1040.123 Section 1040.123... ACTIVITIES Enforcement Opportunity for Hearing § 1040.123 Consolidated or joint hearings. In cases in which... departments or agencies, where applicable, provide for the conduct of consolidated or joint hearings and...

  2. 10 CFR 1040.123 - Consolidated or joint hearings.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 4 2011-01-01 2011-01-01 false Consolidated or joint hearings. 1040.123 Section 1040.123... ACTIVITIES Enforcement Opportunity for Hearing § 1040.123 Consolidated or joint hearings. In cases in which... departments or agencies, where applicable, provide for the conduct of consolidated or joint hearings and...

  3. 42 CFR 422.666 - Designation of hearing officer.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 3 2011-10-01 2011-10-01 false Designation of hearing officer. 422.666 Section 422.666 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES....666 Designation of hearing officer. CMS designates a hearing officer to conduct the hearing....

  4. 42 CFR 422.666 - Designation of hearing officer.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Designation of hearing officer. 422.666 Section 422.666 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES....666 Designation of hearing officer. CMS designates a hearing officer to conduct the hearing....

  5. A Hearing Conservation Program for Wisconsin Youth Working in Agriculture.

    ERIC Educational Resources Information Center

    Knobloch, Mary Jo; Broste, Steven K.

    1998-01-01

    Examined the effects of a multicomponent, four-year hearing-conservation program for farm youth. Researchers conducted pre- and postintervention hearing tests in control and intervention students. Surveys examined family hearing loss, farm work, noise exposure, and hearing-protection device (HPD) utilization. Significantly more intervention…

  6. 33 CFR 20.1207 - Pre-hearing conferences.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Pre-hearing conferences. 20.1207... Expedited Hearings § 20.1207 Pre-hearing conferences. (a) When held. As early as practicable, the ALJ shall order and conduct a pre-hearing conference. He or she may order the holding of the conference in...

  7. 33 CFR 20.1207 - Pre-hearing conferences.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 1 2011-07-01 2011-07-01 false Pre-hearing conferences. 20.1207... Expedited Hearings § 20.1207 Pre-hearing conferences. (a) When held. As early as practicable, the ALJ shall order and conduct a pre-hearing conference. He or she may order the holding of the conference in...

  8. 33 CFR 20.1207 - Pre-hearing conferences.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false Pre-hearing conferences. 20.1207... Expedited Hearings § 20.1207 Pre-hearing conferences. (a) When held. As early as practicable, the ALJ shall order and conduct a pre-hearing conference. He or she may order the holding of the conference in...

  9. 33 CFR 20.1207 - Pre-hearing conferences.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 1 2014-07-01 2014-07-01 false Pre-hearing conferences. 20.1207... Expedited Hearings § 20.1207 Pre-hearing conferences. (a) When held. As early as practicable, the ALJ shall order and conduct a pre-hearing conference. He or she may order the holding of the conference in...

  10. 33 CFR 20.1207 - Pre-hearing conferences.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false Pre-hearing conferences. 20.1207... Expedited Hearings § 20.1207 Pre-hearing conferences. (a) When held. As early as practicable, the ALJ shall order and conduct a pre-hearing conference. He or she may order the holding of the conference in...

  11. 24 CFR 81.84 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...) Hearings shall be conducted by a HUD ALJ authorized to conduct proceedings under 24 CFR part 26, subpart B.... Hearings shall be conducted in accordance with the procedures set forth in 24 CFR part 26, subpart B to the... requirements in 42 U.S.C. 3535(q). (k) Final decision. (1) The initial decision will become the final...

  12. Hearing Impairments

    NASA Astrophysics Data System (ADS)

    Cavender, Anna; Ladner, Richard E.

    For many people with hearing impairments, the degree of hearing loss is only a small aspect of their disability and does not necessarily determine the types of accessibility solutions or accommodations that may be required. For some people, the ability to adjust the audio volume may be sufficient. For others, translation to a signed language may be more appropriate. For still others, access to text alternatives may be the best solution. Because of these differences, it is important for researchers in Web accessibility to understand that people with hearing impairments may have very different cultural-linguistic traditions and personal backgrounds.

  13. Centimeter-scale secondary information on hydraulic conductivity using a hand-held air permeameter on borehole cores.

    NASA Astrophysics Data System (ADS)

    Rogiers, B.; Winters, P.; Huysmans, M.; Beerten, K.; Mallants, D.; Gedeon, M.; Batelaan, O.; Dassargues, A.

    2012-04-01

    Saturated hydraulic conductivity (Ks) is one of the most important parameters determining groundwater flow and contaminant transport in both unsaturated and saturated porous media. Determining the small-scale variability of this parameter is key to evaluate implications on effective parameters at the larger scale. Moreover, for stochastic simulations of groundwater flow and contaminant transport, accurate models on the spatial variability of Ks are very much needed. While several well-established laboratory methods exist for determining Ks, investigating the small-scale variability remains a challenge. If several tens to hundreds of metres of borehole core has to be hydraulically characterised at the centimetre to decimetre scale, several hundreds to thousands of Ks measurements are required, which makes it very costly and time-consuming should traditional methods be used. With reliable air permeameters becoming increasingly available from the late 80's, a fast and effective indirect method exists to determine Ks. Therefore, the use of hand-held air permeameter measurements for determining very accurate small-scale heterogeneity about Ks is very appealing. Very little is known, however, on its applicability for borehole cores that typically carry a small sediment volume. Therefore, the method was tested on several borehole cores of different size, originating from the Campine basin, Northern Belgium. The studied sediments are of Miocene to Pleistocene age, with a marine to continental origin, and consist of sand to clayey sand with distinct clay lenses, resulting in a Ks range of 7 orders of magnitude. During previous studies, two samples were taken from borehole cores each two meters for performing constant head lab permeameter tests. This data is now used as a reference for the air permeameter measurements that are performed with a resolution of 5 centimetres. Preliminary results indicate a very good correlation between the previously gathered constant head Ks

  14. Hearing Aid

    MedlinePlus

    ... and Food and Drug Administration Staff FDA permits marketing of new laser-based hearing aid with potential ... feeds Follow FDA on Twitter Follow FDA on Facebook View FDA videos on YouTube View FDA photos ...

  15. Hearing Impairment

    MedlinePlus

    ... known as noise-induced hearing loss (NIHL) . Personal music players are among the chief culprits of NIHL ... exposure to high noise levels (such as loud music) over time can cause permanent damage to the ...

  16. Prevalence and Nature of Hearing Loss in 22q11.2 Deletion Syndrome

    ERIC Educational Resources Information Center

    Van Eynde, Charlotte; Swillen, Ann; Lambeens, Elien; Verhaert, Nicolas; Desloovere, Christian; Luts, Heleen; Vander Poorten, Vincent; Devriendt, Koenraad; Hens, Greet

    2016-01-01

    Purpose: The purpose of this study was to clarify the prevalence, type, severity, and age-dependency of hearing loss in 22q11.2 deletion syndrome. Method: Extensive audiological measurements were conducted in 40 persons with proven 22q11.2 deletion (aged 6-36 years). Besides air and bone conduction thresholds in the frequency range between 0.125…

  17. 43 CFR 45.25 - What will DOI do with any hearing requests?

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false What will DOI do with any hearing requests... PRESCRIPTIONS IN FERC HYDROPOWER LICENSES Hearing Process Initiation of Hearing Process § 45.25 What will DOI do... will refer the case for a hearing as follows: (1) If the hearing is to be conducted by DOI, OEPC...

  18. 40 CFR 1042.920 - Hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 32 2010-07-01 2010-07-01 false Hearings. 1042.920 Section 1042.920 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR POLLUTION CONTROLS CONTROL OF EMISSIONS FROM NEW AND IN-USE MARINE COMPRESSION-IGNITION ENGINES AND VESSELS Definitions and Other Reference Information § 1042.920 Hearings....

  19. 40 CFR 52.2282 - Public hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 4 2011-07-01 2011-07-01 false Public hearings. 52.2282 Section 52.2282 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS (CONTINUED) Texas § 52.2282 Public hearings. (a)...

  20. 40 CFR 52.2282 - Public hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 5 2014-07-01 2014-07-01 false Public hearings. 52.2282 Section 52.2282 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS (CONTINUED) Texas § 52.2282 Public hearings. (a)...

  1. 40 CFR 52.2282 - Public hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 4 2010-07-01 2010-07-01 false Public hearings. 52.2282 Section 52.2282 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS (CONTINUED) Texas § 52.2282 Public hearings. (a)...

  2. 40 CFR 52.2282 - Public hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 5 2013-07-01 2013-07-01 false Public hearings. 52.2282 Section 52.2282 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS (CONTINUED) Texas § 52.2282 Public hearings. (a)...

  3. Risk Factors for Hearing Loss in Patients Treated With Intensity-Modulated Radiotherapy for Head-and-Neck Tumors

    SciTech Connect

    Zuur, Charlotte L.; Dreschler, Wouter A.; Balm, Alfons J.; Rasch, Coen R.

    2009-06-01

    Purpose: Radiotherapy (RT) is a common treatment of head-and-neck carcinoma. The objective of this study was to perform a prospective multivariate assessment of the dose-effect relationship between intensity-modulated RT and hearing loss. Methods and Materials: Pure tone audiometry at 0.250-16 kHz was obtained before and after treatment in 101 patients (202 ears). All patients received full-course intensity-modulated RT (range, 56-70 Gy), with a median cochlear dose of 11.4 Gy (range, 0.2-69.7). Results: Audiometry was performed 1 week before and a median of 9 weeks (range, 1-112) after treatment. The mean hearing deterioration at pure tone average air-conduction 1-2-4 kHz was small (from 28.6 dB HL to 30.1 dB HL). However, individual patients showed clinically significant hearing loss, with 10-dB threshold shift incidences of 13% and 18% at pure tone averages air-conduction 1-2-4 kHz and 8-10-12.5 kHz, respectively. Post-treatment hearing capability was unfavorable in the case of greater inner ear radiation doses (p <0.0001), unfavorable baseline hearing capability (p <0.0001), green-eyed patients (p <0.0001), and older age (p <0.0001). Using multivariate analysis, a prediction of individual hearing capabiltity after treatment was made. Conclusion: RT-induced hearing loss in the mean population is modest. However, clinically significant hearing loss was observed in older patients with green eyes and unfavorable pretreatment hearing. In these patients, the intended radiation dose may be adjusted according to the proposed predictive model, aiming to decrease the risk of ototoxicity.

  4. Hearing and underwater noise exposure

    NASA Astrophysics Data System (ADS)

    Smith, P. F.

    1985-08-01

    Exposure of divers to intense noise in water is increasing, yet there is no general hearing conservation standard for such exposures. This paper reviews three theories of underwater hearing as well as empirical data in order to identify some requirements that an underwater conservation standard must meet. Among the problems considered are hearing sensitivity in water, the frequency and dynamic ranges of the water-immersed ear, and nonauditory effects of underwater sound. It is concluded that: first, no well developed theoretical basis exists for extrapolating hearing conservation standards for airborne noise to the underwater situation; second, the empirical data on underwater hearing suggest that the frequency range covered by an underwater hearing conservation standard must be broader than is the case in air; third, in order to establish a general hearing conservation standard for underwater noise exposure further research is required on the dynamic range of the ear in water; fourth, underwater noise exposure may involve hazards to other body systems than the ear; and fifth, some exposure conditions may interfere with job performance of divers.

  5. Partial Hearing Preservation after Translabyrinthine Vestibular Schwannoma Resection: Case Report and Review of the Literature

    PubMed Central

    Ahsan, Syed F.; Bojrab, Dennis; Standring, Robert

    2015-01-01

    Objectives To describe a unique case report of a patient who had partial hearing preservation after translabyrinthine (TL) removal of a vestibular schwannoma (VS). Study Design Case report. Methods The patient's chart was reviewed for hearing levels before and after surgery. Preoperative magnetic resonance imaging (MRI) was compared with postoperative MRI for determination of completeness of tumor removal. The literature on hearing preservation after TL resection is reviewed. Results A 42-year-old woman underwent a TL removal of a VS. The patient's preoperative pure tone average (PTA) was 70 dB and word recognition score (WRS) was 40%. Postoperatively, the patient was able to hear ambient noise in the surgical ear. Her bone conduction PTA was 70 dB, but the WRS score dropped to 2%. One year later, she continues to hear ambient noise and sound in the operative ear. Discussion This is the fifth reported case of partial hearing preservation after TL VS resection. It suggests that by preserving the vestibule and the fluids within the vestibule when possible, there maybe enough residual auditory neural structures for a traditional cochlear implant to benefit such a patient. In addition, preserving the incus when possible may help maintain air conduction to help patients with sound localization. PMID:26623229

  6. A tough, thermally conductive silicon carbide composite with high strength up to 1600 degreesC in Air

    PubMed

    Ishikawa; Kajii; Matsunaga; Hogami; Kohtoku; Nagasawa

    1998-11-13

    A sintered silicon carbide fiber-bonded ceramic, which consists of a highly ordered, close-packed structure of very fine hexagonal columnar fibers with a thin interfacial carbon layer between fibers, was synthesized by hot-pressing plied sheets of an amorphous silicon-aluminum-carbon-oxygen fiber prepared from an organosilicon polymer. The interior of the fiber element was composed of sintered beta-silicon carbide crystal without an obvious second phase at the grain boundary and triple points. This material showed high strength (over 600 megapascals in longitudinal direction), fibrous fracture behavior, excellent high-temperature properties (up to 1600 degreesC in air), and high thermal conductivity (even at temperatures over 1000 degreesC). PMID:9812889

  7. Carrier-envelope phase-dependent electronic conductivity in an air filament driven by few-cycle laser pulses

    NASA Astrophysics Data System (ADS)

    Wang, Lifeng; Lu, Xin; Teng, Hao; Xi, Tingting; Chen, Shiyou; He, Peng; He, Xinkui; Wei, Zhiyi

    2016-07-01

    The modulation of the electron conductivity in an air filament, which is produced by carrier-envelope phase (CEP) stabilized 7-fs laser pulses, is realized experimentally. Numerical results based on a coupled 3D+1 generalized nonlinear Schrödinger equation including the real electric-field dependent ionization model are in good agreement with those from the experiment. It is demonstrated that the CEP effect on the electron density originates from the CEP-induced modification of the electric field of the laser pulse, and this modification is amplified during nonlinear propagation. The results provide important information to help understand the physical mechanism of the filaments driven by few-cycle femtosecond laser pulses.

  8. Possible secular change and land-to-ocean extension of air pollution from measurements of atmospheric electrical conductivity over the Bay of Bengal

    NASA Astrophysics Data System (ADS)

    Kamra, A. K.; Deshpande, C. G.

    1995-04-01

    Diurnal variations of the atmospheric electrical conductivity and electric field at a fixed point in the Bay of Bengal, where an oceanographic ship, ORV Sagarkanya, remained stationary for a total of 28 days, are reported. From observations, one can speculate a secular decrease in total conductivity in the Bay of Bengal by at least 40% since the Cobb and Wells (1970) measurements during 1967 global expedition. Problem of the land-to-ocean extension of air pollution has been studied from the conductivity measurements made in the monsoon season when surface winds are persistently southwesterly. Values of conductivity near the eastern coastline of India where windflow is from land to sea are about half of those near to the western coastline where windflow is from sea to land. It is concluded that to know the air conductivity at a point over sea, the age of air mass over sea is a better determining factor than the distance from the coastline.

  9. Hearing loss in shipyard employees

    PubMed Central

    Alexopoulos, Evangelos C.; Tsouvaltzidou, Thomaella

    2015-01-01

    Background: Noise-induced hearing loss (NIHL) is one of the most prevalent occupational illnesses, with a higher incidence in the heavy industry. Objectives of the Study: The aim of this study is to investigate the prevalence of NIHL in Greece and explore its correlations with other job and individual-related factors. Materials and Methods: Questionnaires were administered, and audiograms were conducted to 757 employees of a shipyard company in Greece, both white- and blue-collar, during the period 2006–2009. A modification of the 1979' equation of the American Academy of Otolaryngology was used to calculate hearing loss. Statistical analysis was conducted by means of the SPSS v. 17. Results: A 27.1% of the employees were hearing handicap. Hearing loss was correlated with age, past medical history of ear disease (Meniere's disease, acoustic neuroma, otosclerosis) or injury, hyperlipidemia, job title and level of education. A few questions on subjective hearing ability and symptoms showed strong discriminatory power of hearing pathology. Conclusions: The results of this study emphasize the burden of disease in the shipyard industry, and the need for continuous monitoring, implementation of preventive measures and hearing conservation programs. PMID:26023266

  10. 29 CFR 458.69 - Notice of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Notice of hearing. 458.69 Section 458.69 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR STANDARDS OF CONDUCT STANDARDS OF CONDUCT Hearing and Related Matters § 458.69 Notice of hearing. The Chief Administrative Law...

  11. 29 CFR 0.737-7 - Hearing rights.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 1 2010-07-01 2010-07-01 true Hearing rights. 0.737-7 Section 0.737-7 Labor Office of the Secretary of Labor ETHICS AND CONDUCT OF DEPARTMENT OF LABOR EMPLOYEES Post Employment Conflict of Interest § 0.737-7 Hearing rights. (a) The following rights shall be afforded at a hearing conducted before...

  12. 40 CFR 60.2716 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection? 60.2716 Section 60.2716 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) STANDARDS OF PERFORMANCE FOR NEW STATIONARY... annual air pollution control device inspection), you must complete the air pollution control...

  13. 40 CFR 60.2141 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection? 60.2141 Section 60.2141 Protection of Environment... initial air pollution control device inspection? (a) The initial air pollution control device inspection... startup. (b) Within 10 operating days following an air pollution control device inspection, all...

  14. 40 CFR 60.2716 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection? 60.2716 Section 60.2716 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) STANDARDS OF PERFORMANCE FOR NEW STATIONARY... annual air pollution control device inspection), you must complete the air pollution control...

  15. 40 CFR 60.2151 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection? 60.2151 Section 60.2151 Protection of Environment... annual air pollution control device inspection? On an annual basis (no more than 12 months following the previous annual air pollution control device inspection), you must complete the air pollution...

  16. 40 CFR 60.2716 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection? 60.2716 Section 60.2716 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) STANDARDS OF PERFORMANCE FOR NEW STATIONARY... annual air pollution control device inspection), you must complete the air pollution control...

  17. 40 CFR 60.2141 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection? 60.2141 Section 60.2141 Protection of Environment... initial air pollution control device inspection? (a) The initial air pollution control device inspection... startup. (b) Within 10 operating days following an air pollution control device inspection, all...

  18. 40 CFR 60.2151 - By what date must I conduct the annual air pollution control device inspection?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... air pollution control device inspection? 60.2151 Section 60.2151 Protection of Environment... annual air pollution control device inspection? On an annual basis (no more than 12 months following the previous annual air pollution control device inspection), you must complete the air pollution...

  19. Conducting polymer actuator based on chemically deposited polypyrrole and polyurethane-based solid polymer electrolyte working in air

    NASA Astrophysics Data System (ADS)

    Choi, Hwa-Jeong; Song, Young-Min; Chung, Ildoo; Ryu, Kwang-Sun; Jo, Nam-Ju

    2009-02-01

    Conducting polymers (CPs), such as polypyrrole, polythiophene, and polyaniline, are unique in that they have switchable properties due to their two or more mechanically stable oxidation states. Thus, their films or coatings can be easily switched by the application of a small voltage and current to change their volume during electrochemical redox processes. In particular, polypyrrole (PPy) has been studied most extensively because of its high electrical conductivity and good environmental stability under ambient conditions. In this work, we have studied a new CP actuator, fully polymeric, assembled with two PPy film electrodes and a solid polymer electrolyte (SPE), polyurethane/Mg(ClO4)2. Polyurethanes (PUs) were synthesized from 4,4'-diphenylmethane diisocyanate (MDI), 1,4-butanediol (1,4-BD) and three types of polyol: poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), and PPG-block-PEG-block-PPG (PPG-co-PEG). The chemical polymerization of PPy by immersion in Py monomer aqueous solution and oxidant aqueous solution is an adequate method to prepare PU/PPy composite film as an actuator. To find the proper thickness of the PPy coating layer for actuation, we measured the displacements of the actuators according to the thickness of the PPy coating layer. The displacement of all actuators is discussed in connection with the properties of the SPE and PPy. All the results obtained in this work show the feasibility of electrochemomechanical devices based on PPy and SPE film being able to work in air.

  20. Cervical and ocular vestibular-evoked myogenic potentials in vestibular neuritis: comparison between air- and bone-conducted stimulation.

    PubMed

    Oh, Sun-Young; Kim, Ji-Soo; Yang, Tae-Ho; Shin, Byoung-Soo; Jeong, Seul-Ki

    2013-08-01

    To clarify the changes of cervical (cVEMP) and ocular (oVEMP) vestibular evoked myogenic potentials induced by air-conducted sound (ACS) and bone-conducted vibration (BCV) in patients with vestibular neuritis (VN), patients with VN (n = 30) and normal controls (n = 45) underwent recording of cVEMP and oVEMP in response to ACS (1,000 Hz, 5 ms, tone bursts) and BCV (500 Hz, short tone burst). Patients with VN showed a high proportion of oVEMP abnormalities in response to both ACS (80.0 %) and BCV at the forehead (Fz, 73.3 %) or the mastoid (76.7 %). In contrast, cVEMPs were mostly normal with both ACS and BCV in the patients. The dissociations in the abnormalities of cVEMP and oVEMP induced by ACS and BCV at the mastoids and at the forehead in patients with VN suggest that oVEMP reflects functions of the superior vestibular nerve and most likely the utricular function. The results of our study suggest that oVEMP induced by either ACS or BCV appears to depend on integrity of the superior vestibular nerve, possibly due to the utricular afferents travelling in it. In contrast, cVEMP elicited by either ACS or BCV may reflect function of the saccular afferents running in the inferior vestibular nerve. PMID:23670310

  1. Surgical approaches to treating otitis media in the only hearing ear of patients with contralateral hearing loss

    PubMed Central

    Tong, Jun; Chen, Wenwen; Deng, Yaxin; Cai, Xunhua; Shan, Liang; Du, Lijun

    2015-01-01

    The aim of this study was to retrospectively analyze the surgical procedures used to treat the only hearing ears of two patient cohorts diagnosed with otitis media in the last twenty years. Clinical, surgical, and follow-up data of 15 patients with otitis media in the only hearing ear who underwent middle ear surgery prior to 2000 (Cohort A) and 13 patients with a similar condition (Cohort B) who underwent middle ear surgery between 2000 and 2013 were retrospectively collected, analyzed, and compared. Mean preoperative air conduction (AC) and bone conduction of the patients in Cohort B was 61 ± 18.7 and 20 ± 15.7 dBHL, respectively. Mean preoperative and postoperative air bone gap was 43.21 ± 13.2 dBHL and 12.66 ± 3.93 dBHL, respectively. The success rate of the surgical procedures in this patient cohort was 85%. Surgery of the only hearing ear in patients with otitis media is safe and effective if performed carefully. PMID:26309687

  2. 40 CFR 60.2706 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... air pollution control device inspection? 60.2706 Section 60.2706 Protection of Environment... pollution control device inspection? (a) The initial air pollution control device inspection must be... meeting the amended emission limitations. (b) Within 10 operating days following an air pollution...

  3. 40 CFR 60.2706 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... air pollution control device inspection? 60.2706 Section 60.2706 Protection of Environment... pollution control device inspection? (a) The initial air pollution control device inspection must be... meeting the amended emission limitations. (b) Within 10 operating days following an air pollution...

  4. 40 CFR 60.2706 - By what date must I conduct the initial air pollution control device inspection?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... air pollution control device inspection? 60.2706 Section 60.2706 Protection of Environment... pollution control device inspection? (a) The initial air pollution control device inspection must be... meeting the amended emission limitations. (b) Within 10 operating days following an air pollution...

  5. Frequency and phase effects on cervical vestibular evoked myogenic potentials (cVEMPs) to air-conducted sound.

    PubMed

    Govender, Sendhil; Dennis, Danielle L; Colebatch, James G

    2016-09-01

    Few previous studies of tuning using air-conducted (AC) stimuli and the cervical vestibular evoked myogenic potential (cVEMP) have compensated for the effects of middle ear (ME) attenuation. Zhang et al. (Exp Brain Res 213:111-116, 2011a) who did allow for ME effects were able to show a secondary peak around 100 Hz for the ocular VEMP (oVEMP). Recently, it has become clear that the otolith afferents responsible for the cVEMP and oVEMP differ and thus the nature of tuning may be more related to the reflex studied determining which otolith receptors are activated rather than the properties of the stimulus. We wished to reinvestigate the tuning for the cVEMP using AC stimuli, to establish whether the low-frequency peak is specific for the oVEMP or a consequence of the stimulus modality itself. In response to recent evidence using a 500 Hz AC stimulus that there was no effect of stimulus phase, we also investigated whether phase (condensation or rarefaction) had an effect at any frequency. We measured corrected cVEMP amplitudes and latencies in response to stimuli between 50 and 1200 Hz in 10 normal volunteers using an AC stimulus adjusted for ME attenuation. We confirmed earlier reports of the similarity of the tuning for both the cVEMP and oVEMP reflexes but found no separate 100 Hz peak for the cVEMP. AC stimulus phase did not affect either amplitude or latency. Both the tuning pattern and the phase effects contrast with those previously reported for bone-conducted (BC) stimuli. Unlike BC stimulation, which shows tuning consistent with an action on the otolith membrane, AC stimuli are likely to act through a different mechanism, most likely directly at the hair cell level. PMID:27150315

  6. Ionic Conductivity and Air Stability of Al-Doped Li₇La₃Zr₂O₁₂ Sintered in Alumina and Pt Crucibles.

    PubMed

    Xia, Wenhao; Xu, Biyi; Duan, Huanan; Guo, Yiping; Kang, Hongmei; Li, Hua; Liu, Hezhou

    2016-03-01

    Li7La3Zr2O12 (LLZO) is a promising electrolyte material for all-solid-state battery due to its high ionic conductivity and good stability with metallic lithium. In this article, we studied the effect of crucibles on the ionic conductivity and air stability by synthesizing 0.25Al doped LLZO pellets in Pt crucibles and alumina crucibles, respectively. The results show that the composition and microstructure of the pellets play important roles influencing the ionic conductivity, relative density, and air stability. Specifically, the 0.25Al-LLZO pellets sintered in Pt crucibles exhibit a high relative density (∼96%) and high ionic conductivity (4.48 × 10(-4) S cm(-1)). The ionic conductivity maintains 3.6 × 10(-4) S cm(-1) after 3-month air exposure. In contrast, the ionic conductivity of the pellets from alumina crucibles is about 1.81 × 10(-4) S cm(-1) and drops to 2.39 × 10(-5) S cm(-1) 3 months later. The large grains and the reduced grain boundaries in the pellets sintered in Pt crucibles are favorable to obtain high ionic conductivity and good air stability. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy results suggest that the formation of Li2CO3 on the pellet surface is probably another main reason, which is also closely related to the relative density and the amount of grain boundary within the pellets. This work stresses the importance of synthesis parameters, crucibles included, to obtain the LLZO electrolyte with high ionic conductivity and good air stability. PMID:26859158

  7. 32 CFR 865.109 - Procedures for hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 6 2010-07-01 2010-07-01 false Procedures for hearings. 865.109 Section 865.109 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE ORGANIZATION AND MISSION-GENERAL PERSONNEL REVIEW BOARDS Air Force Discharge Review Board § 865.109 Procedures for hearings. (a) The applicant is entitled, by law,...

  8. 32 CFR 865.109 - Procedures for hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 6 2011-07-01 2011-07-01 false Procedures for hearings. 865.109 Section 865.109 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE ORGANIZATION AND MISSION-GENERAL PERSONNEL REVIEW BOARDS Air Force Discharge Review Board § 865.109 Procedures for hearings. (a) The applicant is entitled, by law,...

  9. Is Hearing Impairment Associated with Rheumatoid Arthritis? A Review

    PubMed Central

    Emamifar, Amir; Bjoerndal, Kristine; Hansen, Inger M.J.

    2016-01-01

    Background: Rheumatoid arthritis (RA) is a systemic, inflammatory disease that affects 1% of the population. The auditory system may be involved during the course of disease; however the association of RA and hearing impairment has not been clearly defined. Objective: The objective of this review is to evaluate published clinical reports related to hearing impairment in patients with RA. Furthermore, we discuss possible pathologies and associated factors as well as new treatment modalities. Method: A thorough literature search was performed using available databases including Pubmed, Embase, Cochrane and ComDisDome to cover all relative reports. The following keywords were used: hearing loss, hearing difficulties, hearing disorders, hearing impairment, sensorineural hearing loss, conductive hearing loss, mixed hearing loss, autoimmune hearing loss, drug ototoxicity, drug-induced hearing loss, hearing test, audiometry, auditory dysfunction and rheumatoid arthritis. Conclusion: Based on our review it can be postulated that patients with RA are at higher risk of hearing impairment compared to healthy subjects in their course of the disease. The hearing impairment in RA seems to be a multifactorial condition; however the mechanisms of injury, as well as the relative risk factors, are not completely clear. This review can aid to clarify this condition and is a guide for further evaluation. To the best of our knowledge, this is the first review of hearing impairment in RA. PMID:27053970

  10. Hearing Instruments for Unilateral Severe-to-Profound Sensorineural Hearing Loss in Adults: A Systematic Review and Meta-Analysis

    PubMed Central

    Smith, Sandra Nelson; Lucas, Laura

    2016-01-01

    Objectives: A systematic review of the literature and meta-analysis was conducted to assess the nature and quality of the evidence for the use of hearing instruments in adults with a unilateral severe to profound sensorineural hearing loss. Design: The PubMed, EMBASE, MEDLINE, Cochrane, CINAHL, and DARE databases were searched with no restrictions on language. The search included articles from the start of each database until February 11, 2015. Studies were included that (a) assessed the impact of any form of hearing instrument, including devices that reroute signals between the ears or restore aspects of hearing to a deaf ear, in adults with a sensorineural severe to profound loss in one ear and normal or near-normal hearing in the other ear; (b) compared different devices or compared a device with placebo or the unaided condition; (c) measured outcomes in terms of speech perception, spatial listening, or quality of life; (d) were prospective controlled or observational studies. Studies that met prospectively defined criteria were subjected to random effects meta-analyses. Results: Twenty-seven studies reported in 30 articles were included. The evidence was graded as low-to-moderate quality having been obtained primarily from observational before-after comparisons. The meta-analysis identified statistically significant benefits to speech perception in noise for devices that rerouted the speech signals of interest from the worse ear to the better ear using either air or bone conduction (mean benefit, 2.5 dB). However, these devices also degraded speech understanding significantly and to a similar extent (mean deficit, 3.1 dB) when noise was rerouted to the better ear. Data on the effects of cochlear implantation on speech perception could not be pooled as the prospectively defined criteria for meta-analysis were not met. Inconsistency in the assessment of outcomes relating to sound localization also precluded the synthesis of evidence across studies. Evidence for

  11. Exposure to music and noise-induced hearing loss (NIHL) among professional pop/rock/jazz musicians.

    PubMed

    Halevi-Katz, Dana N; Yaakobi, Erez; Putter-Katz, Hanna

    2015-01-01

    Noise-induced hearing loss (NIHL) has been extensively studied in industrial work environments. With the advent of new technologies, loud music has been increasingly affecting listeners outside of the industrial setting. Most research on the effects of music and hearing loss has focused on classical musicians. The purpose of the current study was to examine the relationship between the amount of experience a professional pop/rock/jazz musician has and objective and subjective variables of the musician's hearing loss. This study also examined professional pop/rock/jazz musicians' use of hearing protection devices in relation to the extent of their exposure to amplified music. Forty-four pop/rock/jazz musicians were interviewed using the Pop/Rock/Jazz Musician's Questionnaire (PRJMQ) in order to obtain self-reported symptoms of tinnitus and hyperacusis. Forty-two of the subjects were also tested for air-conduction hearing thresholds in the frequency range of 1-8 kHz. Results show that the extent of professional pop/rock/jazz musicians' exposure to amplified music was related to both objective and subjective variables of hearing loss: Greater musical experience was positively linked to higher hearing thresholds in the frequency range of 3-6 kHz and to the subjective symptom of tinnitus. Weekly hours playing were found to have a greater effect on hearing loss in comparison to years playing. Use of hearing protection was not linked to the extent of exposure to amplified music. It is recommended that further research be conducted with a larger sample, in order to gain a greater understanding of the detrimental effects of hours playing versus years playing. PMID:25913555

  12. Exposure to music and noise-induced hearing loss (NIHL) among professional pop/rock/jazz musicians

    PubMed Central

    Halevi-Katz, Dana N.; Yaakobi, Erez; Putter-Katz, Hanna

    2015-01-01

    Noise-induced hearing loss (NIHL) has been extensively studied in industrial work environments. With the advent of new technologies, loud music has been increasingly affecting listeners outside of the industrial setting. Most research on the effects of music and hearing loss has focused on classical musicians. The purpose of the current study was to examine the relationship between the amount of experience a professional pop/rock/jazz musician has and objective and subjective variables of the musician's hearing loss. This study also examined professional pop/rock/jazz musicians’ use of hearing protection devices in relation to the extent of their exposure to amplified music. Forty-four pop/rock/jazz musicians were interviewed using the Pop/Rock/Jazz Musician's Questionnaire (PRJMQ) in order to obtain self-reported symptoms of tinnitus and hyperacusis. Forty-two of the subjects were also tested for air-conduction hearing thresholds in the frequency range of 1-8 kHz. Results show that the extent of professional pop/rock/jazz musicians’ exposure to amplified music was related to both objective and subjective variables of hearing loss: Greater musical experience was positively linked to higher hearing thresholds in the frequency range of 3-6 kHz and to the subjective symptom of tinnitus. Weekly hours playing were found to have a greater effect on hearing loss in comparison to years playing. Use of hearing protection was not linked to the extent of exposure to amplified music. It is recommended that further research be conducted with a larger sample, in order to gain a greater understanding of the detrimental effects of hours playing versus years playing. PMID:25913555

  13. Living with Hearing Loss

    MedlinePlus

    ... Issues Special Section: Focus on Communication Living with Hearing Loss Past Issues / Fall 2008 Table of Contents For ... Fast Facts There are two main types of hearing loss. Permanent hearing loss (called sensorineural) usually involves damage ...

  14. Hearing Disorders and Deafness

    MedlinePlus

    ... you from hearing sound at all. What causes hearing loss? Some possibilities are Heredity Diseases such as ear ... noise Aging There are two main types of hearing loss. One happens when your inner ear or auditory ...

  15. Noise and Hearing Protection

    MedlinePlus

    ... particularly because such exposure is avoidable. What causes hearing loss? The ear has three main parts: the outer, ... can I tell if my hearing is damaged? Hearing loss usually develops over a period of several years. ...

  16. Help with Hearing

    MedlinePlus

    ... hearing. This problem can make it more diffi- cult to learn speech sounds and language correctly. Take ... how your child is hearing. See how diffi- cult it is to hear words correctly? Some children ...

  17. 29 CFR 24.107 - Hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 29 Labor 1 2011-07-01 2011-07-01 false Hearings. 24.107 Section 24.107 Labor Office of the... Litigation § 24.107 Hearings. (a) Except as provided in this part, proceedings will be conducted in accordance with the rules of practice and procedure and the rules of evidence for administrative...

  18. 29 CFR 90.13 - Public hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...) Form of request. A request for public hearing shall be filed in the same manner as provided for filing... shall conduct and preside over public hearings. (e) Order of testimony. Witnesses will testify in the order designated by the presiding officer. Each witness, after being duly sworn, will proceed...

  19. 29 CFR 90.13 - Public hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...) Form of request. A request for public hearing shall be filed in the same manner as provided for filing... shall conduct and preside over public hearings. (e) Order of testimony. Witnesses will testify in the order designated by the presiding officer. Each witness, after being duly sworn, will proceed...

  20. 29 CFR 90.13 - Public hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...) Form of request. A request for public hearing shall be filed in the same manner as provided for filing... shall conduct and preside over public hearings. (e) Order of testimony. Witnesses will testify in the order designated by the presiding officer. Each witness, after being duly sworn, will proceed...

  1. 34 CFR 300.512 - Hearing rights.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 2 2010-07-01 2010-07-01 false Hearing rights. 300.512 Section 300.512 Education... DISABILITIES Procedural Safeguards Due Process Procedures for Parents and Children § 300.512 Hearing rights. (a....534, or an appeal conducted pursuant to § 300.514, has the right to— (1) Be accompanied and advised...

  2. 78 FR 64037 - Notice of Hearing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-25

    ... From the Federal Register Online via the Government Publishing Office PRIVACY AND CIVIL LIBERTIES OVERSIGHT BOARD Notice of Hearing AGENCY: Privacy and Civil Liberties Oversight Board (PCLOB). ACTION: Notice of a hearing. SUMMARY: The Privacy and Civil Liberties Oversight Board (PCLOB) will conduct...

  3. Hearing Function in Patients Living with HIV/AIDS

    PubMed Central

    Luque, Amneris E.; Orlando, Mark S.; Leong, U-Cheng; Allen, Paul D.; Guido, Joseph J.; Yang, Hongmei; Wu, Hulin

    2014-01-01

    Background During the earlier years of the HIV/AIDS epidemic, initial reports described sensorineural hearing loss in up to 49% of individuals with HIV/AIDS. During those years, patients commonly progressed to advanced stages of HIV disease, and frequently had neurological complications. However, the abnormalities on pure-tone audiometry and brainstem evoked responses outlined in small studies were not always consistently correlated with advanced stages of HIV/AIDS. Moreover, these studies could not exclude the confounding effect of concurrent opportunistic infections and syphilis. Additional reports also have indicated that some antiretroviral (ARV) medications may be ototoxic, thus it has been difficult to make conclusions regarding the cause of changes in hearing function in HIV-infected patients. More recently, accelerated aging has been suggested as a potential explanation for the disproportionate increase in complications of aging described in many HIV-infected patients, hence accelerated aging associated hearing loss may also be playing a role in these patients. Methods We conducted a large cross-sectional analysis of hearing function in over 300 patients with HIV-1 infection and in 137 HIV-uninfected controls. HIV-infected participants and HIV-uninfected controls underwent a two-hour battery of hearing tests including the Hearing Handicap Inventory, standard audiometric pure-tone air and bone conduction testing, tympanometric testing and speech reception and discrimination testing. Results Three-way ANOVA and logistic regression analysis of 278 eligible HIV-infected subjects stratified by disease stage in early HIV disease (n= 127) and late HIV disease (n=148) and 120 eligible HIV-uninfected controls revealed no statistical significant differences among the three study groups in either overall 4-PTA or hearing loss prevalence in either ear. Three-way ANOVA showed significant differences in word recognition scores (WRS) in the right ear among groups; a

  4. Components of Metabolic Syndrome as Risk Factors for Hearing Threshold Shifts

    PubMed Central

    Sun, Yu-Shan; Fang, Wen-Hui; Kao, Tung-Wei; Yang, Hui-Fang; Peng, Tao-Chun; Wu, Li-Wei; Chang, Yaw-Wen; Chou, Chang-Yi; Chen, Wei-Liang

    2015-01-01

    Background Hearing loss was a common, chronically disabling condition in the general population and had been associated with several inflammatory diseases. Metabolic syndrome, which was associated with insulin resistance and visceral obesity, was considered a chronic inflammatory disease. To date, few attempts had been made to establish a direct relationship between hearing loss and metabolic syndrome. The aim of the present study was to investigate the relationship between metabolic syndrome and hearing loss by analyzing the data in the reports of the National Health and Nutrition Examination Survey 1999–2004. Methods This study included 2100 participants aged ≤ 65 years who enrolled in the National Health and Nutrition Examination Survey (1999–2004). We examined the relationship between the presence of different features of metabolic syndrome in the participants and their pure-tone air-conduction hearing thresholds, including low-frequency and high-frequency thresholds. Results After adjusting for potential confounders, such as age, medical conditions, and smoking status, the participants with more components of metabolic syndrome were found to have higher hearing thresholds than those with fewer components of metabolic syndrome (p < 0.05 for a trend). The low-frequency hearing threshold was associated with individual components of metabolic syndrome, such as abdominal obesity, high blood pressure, elevated triglycerides, and a low level of high-density lipoprotein cholesterol (HDL-C) (p < 0.05 for all parameters). Conclusions The results indicated that the presence of a greater number of components of metabolic syndrome was significantly associated with the hearing threshold in the US adult population. Among the components of metabolic syndrome, the most apparent association was observed between low HDL and hearing loss. PMID:26247614

  5. 41 CFR 105-8.170-11 - Hearing.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 41 Public Contracts and Property Management 3 2011-01-01 2011-01-01 false Hearing. 105-8.170-11... HANDICAP IN PROGRAMS OR ACTIVITIES CONDUCTED BY GENERAL SERVICES ADMINISTRATION § 105-8.170-11 Hearing. (a) Upon a timely request for a hearing, the Special Counsel shall take the necessary action to obtain...

  6. 7 CFR 1.168 - Procedure for hearing.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... increase the United States Department of Agriculture's cost of conducting the hearing, the hearing shall be... 7 Agriculture 1 2010-01-01 2010-01-01 false Procedure for hearing. 1.168 Section 1.168 Agriculture Office of the Secretary of Agriculture ADMINISTRATIVE REGULATIONS Rules of Practice Governing Cease...

  7. 18 CFR 808.3 - Hearings on administrative appeal.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... administrative appeal. 808.3 Section 808.3 Conservation of Power and Water Resources SUSQUEHANNA RIVER BASIN COMMISSION HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.3 Hearings on administrative appeal. (a) Unless otherwise agreed to by the Commission and the party requesting an administrative appeal...

  8. 18 CFR 808.3 - Hearings on administrative appeal.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... administrative appeal. 808.3 Section 808.3 Conservation of Power and Water Resources SUSQUEHANNA RIVER BASIN COMMISSION HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.3 Hearings on administrative appeal. (a) Unless otherwise agreed to by the Commission and the party requesting an administrative appeal...

  9. 18 CFR 808.3 - Hearings on administrative appeal.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... administrative appeal. 808.3 Section 808.3 Conservation of Power and Water Resources SUSQUEHANNA RIVER BASIN COMMISSION HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.3 Hearings on administrative appeal. (a) Unless otherwise agreed to by the Commission and the party requesting an administrative appeal...

  10. 18 CFR 808.3 - Hearings on administrative appeal.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... administrative appeal. 808.3 Section 808.3 Conservation of Power and Water Resources SUSQUEHANNA RIVER BASIN COMMISSION HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.3 Hearings on administrative appeal. (a) Unless otherwise agreed to by the Commission and the party requesting an administrative appeal...

  11. 18 CFR 808.3 - Hearings on administrative appeal.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... administrative appeal. 808.3 Section 808.3 Conservation of Power and Water Resources SUSQUEHANNA RIVER BASIN COMMISSION HEARINGS AND ENFORCEMENT ACTIONS Conduct of Hearings § 808.3 Hearings on administrative appeal. (a) Unless otherwise agreed to by the Commission and the party requesting an administrative appeal...

  12. 42 CFR 422.666 - Designation of hearing officer.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 3 2013-10-01 2013-10-01 false Designation of hearing officer. 422.666 Section 422.666 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES... Appeals § 422.666 Designation of hearing officer. CMS designates a hearing officer to conduct the...

  13. 10 CFR 4.64 - Consolidated or joint hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 1 2010-01-01 2010-01-01 false Consolidated or joint hearings. 4.64 Section 4.64 Energy... Consolidated or joint hearings. In cases in which the same or related facts are asserted to constitute... or agencies, where applicable, provide for the conduct of consolidated or joint hearings, and for...

  14. 10 CFR 4.64 - Consolidated or joint hearings.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 1 2012-01-01 2012-01-01 false Consolidated or joint hearings. 4.64 Section 4.64 Energy... Consolidated or joint hearings. In cases in which the same or related facts are asserted to constitute... or agencies, where applicable, provide for the conduct of consolidated or joint hearings, and for...

  15. 10 CFR 4.64 - Consolidated or joint hearings.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 1 2014-01-01 2014-01-01 false Consolidated or joint hearings. 4.64 Section 4.64 Energy... Consolidated or joint hearings. In cases in which the same or related facts are asserted to constitute... or agencies, where applicable, provide for the conduct of consolidated or joint hearings, and for...

  16. 43 CFR 7.37 - Civil penalty hearings procedures.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... address specified in the notice of assessment. Hearings shall be conducted in accordance with 43 CFR part...) Appearance and practice. (1) Subject to the provisions of 43 CFR 1.3, the respondent may appear in person, by... Director, Office of Hearings and Appeals, shall appoint an ad hoc appeals board to hear and decide...

  17. 43 CFR 7.37 - Civil penalty hearings procedures.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... address specified in the notice of assessment. Hearings shall be conducted in accordance with 43 CFR part...) Appearance and practice. (1) Subject to the provisions of 43 CFR 1.3, the respondent may appear in person, by... Director, Office of Hearings and Appeals, shall appoint an ad hoc appeals board to hear and decide...

  18. 43 CFR 7.37 - Civil penalty hearings procedures.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... address specified in the notice of assessment. Hearings shall be conducted in accordance with 43 CFR part...) Appearance and practice. (1) Subject to the provisions of 43 CFR 1.3, the respondent may appear in person, by... Director, Office of Hearings and Appeals, shall appoint an ad hoc appeals board to hear and decide...

  19. 43 CFR 7.37 - Civil penalty hearings procedures.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... address specified in the notice of assessment. Hearings shall be conducted in accordance with 43 CFR part...) Appearance and practice. (1) Subject to the provisions of 43 CFR 1.3, the respondent may appear in person, by... Director, Office of Hearings and Appeals, shall appoint an ad hoc appeals board to hear and decide...

  20. 42 CFR 422.666 - Designation of hearing officer.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 3 2014-10-01 2014-10-01 false Designation of hearing officer. 422.666 Section 422.666 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES... Appeals § 422.666 Designation of hearing officer. CMS designates a hearing officer to conduct the...

  1. 42 CFR 422.666 - Designation of hearing officer.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 3 2012-10-01 2012-10-01 false Designation of hearing officer. 422.666 Section 422.666 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES... Appeals § 422.666 Designation of hearing officer. CMS designates a hearing officer to conduct the...

  2. 7 CFR 6.8 - Representation at Tariff Commission hearings.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 1 2010-01-01 2010-01-01 false Representation at Tariff Commission hearings. 6.8... § 6.8 Representation at Tariff Commission hearings. The Department of Agriculture shall be represented at all hearings conducted by the Tariff Commission under section 22 by persons designated by...

  3. Hearing Loss and Older Adults

    MedlinePlus

    ... Home » Health Info » Hearing, Ear Infections, and Deafness Hearing Loss and Older Adults On this page: What is ... about hearing loss and older adults? What is hearing loss? Hearing loss is a sudden or gradual decrease ...

  4. Synthesis of an air-working trilayer artificial muscle using a conductive cassava starch biofilm (manihot esculenta, cranz) and polypyrrole (PPy)

    NASA Astrophysics Data System (ADS)

    Núñez D, Y. E.; Arrieta A, Á. A.; Segura B, J. A.; Bertel H, S. D.

    2016-02-01

    In this study, a methodology for obtaining a conductive cassava starch biofilm doped with lithium perchlorate (LiClO4) is shown, as well as the electrochemical technique for the synthesis of polypyrrole films, which are used for developing the trilayer artificial muscle PPy/Biopolymer/PPy designed to operate in air. Furthermore, results from the trilayer movement using chronoamperometric techniques are shown.

  5. Hearing Parents' Appraisals of Parenting a Deaf or Hard-of-Hearing Child: Application of a Positive Psychology Framework

    ERIC Educational Resources Information Center

    Szarkowski, Amy; Brice, Patrick J.

    2016-01-01

    Hearing parents of deaf and hard-of-hearing children face unique challenges and stressors, the understanding of which has been the focus of numerous studies; yet, relatively little is known about their positive experiences. Using a qualitative purposive sampling design, interviews were conducted with 11 hearing parents (8 mothers, 3 fathers)…

  6. 34 CFR 81.6 - Hearing on the record.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false Hearing on the record. 81.6 Section 81.6 Education... Provisions § 81.6 Hearing on the record. (a) A hearing on the record is a process for the orderly... notice of designation under § 81.3(b), an ALJ conducts the hearing entirely on the basis of briefs...

  7. Hearing and hearing loss: Causes, effects, and treatments

    NASA Astrophysics Data System (ADS)

    Schmiedt, Richard A.

    2003-04-01

    Hearing loss can have multiple causes. The outer and middle ears are conductive pathways for acoustic energy to the inner ear (cochlea) and help shape our spectral sensitivity. Conductive hearing loss is mechanical in nature such that the energy transfer to the cochlea is impeded, often from eardrum perforations or middle ear fluid buildup. Beyond the middle ear, the cochlea comprises three interdependent systems necessary for normal hearing. The first is that of basilar-membrane micromechanics including the outer hair cells. This system forms the basis of the cochlear amplifier and is the most vulnerable to noise and drug exposure. The second system comprises the ion pumps in the lateral wall tissues of the cochlea. These highly metabolic cells provide energy to the cochlear amplifier in the form of electrochemical potentials. This second system is particularly vulnerable to the effects of aging. The third system comprises the inner hair cells and their associated sensory nerve fibers. This system is the transduction stage, changing mechanical vibrations to nerve impulses. New treatments for hearing loss are on the horizon; however, at present the best strategy is avoidance of cochlear trauma and the proper use of hearing aids. [Work supported by NIA and MUSC.

  8. Incorporating Mythic and Interpretive Analysis in the Investigation of Hearing Loss on the Family Farm

    ERIC Educational Resources Information Center

    Meister, Mark; Hest, Theresa; Burnett, Ann

    2010-01-01

    Despite knowing about the dangers of hearing loss, farmers typically choose not to protect their hearing. Examining the myth of farm life, this study aims to discern whether rhetorical myths influence farmers' decisions to wear hearing protection. Researchers conducted 40 interviews with farmers regarding farm life and hearing loss. Results…

  9. 34 CFR 395.13 - Evidentiary hearings and arbitration of vendor complaints.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 34 Education 2 2011-07-01 2010-07-01 true Evidentiary hearings and arbitration of vendor... hearings and arbitration of vendor complaints. (a) The State licensing agency shall specify in writing and... is necessary for the conduct of a full evidentiary hearing or the hearing of an ad hoc...

  10. 34 CFR 395.13 - Evidentiary hearings and arbitration of vendor complaints.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 2 2010-07-01 2010-07-01 false Evidentiary hearings and arbitration of vendor... hearings and arbitration of vendor complaints. (a) The State licensing agency shall specify in writing and... is necessary for the conduct of a full evidentiary hearing or the hearing of an ad hoc...

  11. Analyses and estimates of hydraulic conductivity from slug tests in alluvial aquifer underlying Air Force Plant 4 and Naval Air Station-Joint Reserve Base Carswell Field, Fort Worth, Texas

    USGS Publications Warehouse

    Houston, Natalie A.; Braun, Christopher L.

    2004-01-01

    This report describes the collection, analyses, and distribution of hydraulic-conductivity data obtained from slug tests completed in the alluvial aquifer underlying Air Force Plant 4 and Naval Air Station-Joint Reserve Base Carswell Field, Fort Worth, Texas, during October 2002 and August 2003 and summarizes previously available hydraulic-conductivity data. The U.S. Geological Survey, in cooperation with the U.S. Air Force, completed 30 slug tests in October 2002 and August 2003 to obtain estimates of horizontal hydraulic conductivity to use as initial values in a ground-water-flow model for the site. The tests were done by placing a polyvinyl-chloride slug of known volume beneath the water level in selected wells, removing the slug, and measuring the resulting water-level recovery over time. The water levels were measured with a pressure transducer and recorded with a data logger. Hydraulic-conductivity values were estimated from an analytical relation between the instantaneous displacement of water in a well bore and the resulting rate of head change. Although nearly two-thirds of the tested wells recovered 90 percent of their slug-induced head change in less than 2 minutes, 90-percent recovery times ranged from 3 seconds to 35 minutes. The estimates of hydraulic conductivity range from 0.2 to 200 feet per day. Eighty-three percent of the estimates are between 1 and 100 feet per day.

  12. [Hearing preservation: Better hearing with advanced technology].

    PubMed

    Rader, T; Helbig, S; Stöver, T; Baumann, U

    2014-05-01

    Preservation of residual hearing after cochlear implantation allows patients the synergetic use of electric and acoustic stimulation (EAS). The application of specific surgical and therapeutic techniques enables the reduction of inner ear trauma, which leads otherwise to complete hearing loss. Due to simultaneous electric and acoustic stimulation, speech understanding is improved especially in noise. EAS is a well-accepted therapeutic treatment for subjects with profound hearing loss in the higher frequencies and no or mild hearing loss in the low frequencies. Several Manufacturers offer individual soft electrodes specially designed for hearing preservation as well as combined electric-acoustic audio processors. PMID:24782208

  13. The master hearing aid.

    PubMed

    Curran, James R; Galster, Jason A

    2013-06-01

    As early as the 1930s the term Master Hearing Aid (MHA) described a device used in the fitting of hearing aids. In their original form, the MHA was a desktop system that allowed for simulated or actual adjustment of hearing aid components that resulted in a changed hearing aid response. Over the years the MHA saw many embodiments and contributed to a number of rationales for the fitting of hearing aids. During these same years, the MHA was viewed by many as an inappropriate means of demonstrating hearing aids; the audio quality of the desktop systems was often superior to the hearing aids themselves. These opinions and the evolution of the MHA have molded the modern perception of hearing aids and the techniques used in the fitting of hearing aids. This article reports on a history of the MHA and its influence on the fitting of hearing aids. PMID:23686682

  14. The Master Hearing Aid

    PubMed Central

    Curran, James R.

    2013-01-01

    As early as the 1930s the term Master Hearing Aid (MHA) described a device used in the fitting of hearing aids. In their original form, the MHA was a desktop system that allowed for simulated or actual adjustment of hearing aid components that resulted in a changed hearing aid response. Over the years the MHA saw many embodiments and contributed to a number of rationales for the fitting of hearing aids. During these same years, the MHA was viewed by many as an inappropriate means of demonstrating hearing aids; the audio quality of the desktop systems was often superior to the hearing aids themselves. These opinions and the evolution of the MHA have molded the modern perception of hearing aids and the techniques used in the fitting of hearing aids. This article reports on a history of the MHA and its influence on the fitting of hearing aids. PMID:23686682

  15. Hearing Loss in HIV-Infected Children in Lilongwe, Malawi

    PubMed Central

    Hrapcak, Susan; Kuper, Hannah; Bartlett, Peter; Devendra, Akash; Makawa, Atupele; Kim, Maria; Kazembe, Peter; Ahmed, Saeed

    2016-01-01

    Introduction With improved access to antiretroviral therapy (ART), HIV infection is becoming a chronic illness. Preliminary data suggest that HIV-infected children have a higher risk of disabilities, including hearing impairment, although data are sparse. This study aimed to estimate the prevalence and types of hearing loss in HIV-infected children in Lilongwe, Malawi. Methods This was a cross-sectional survey of 380 HIV-infected children aged 4–14 years attending ART clinic in Lilongwe between December 2013-March 2014. Data was collected through pediatric quality of life and sociodemographic questionnaires, electronic medical record review, and detailed audiologic testing. Hearing loss was defined as >20 decibels hearing level (dBHL) in either ear. Predictors of hearing loss were explored by regression analysis generating age- and sex-adjusted odds ratios. Children with significant hearing loss were fitted with hearing aids. Results Of 380 patients, 24% had hearing loss: 82% conductive, 14% sensorineural, and 4% mixed. Twenty-one patients (23% of those with hearing loss) were referred for hearing aid fitting. There was a higher prevalence of hearing loss in children with history of frequent ear infections (OR 7.4, 4.2–13.0) and ear drainage (OR 6.4, 3.6–11.6). Hearing loss was linked to history of WHO Stage 3 (OR 2.4, 1.2–4.5) or Stage 4 (OR 6.4, 2.7–15.2) and history of malnutrition (OR 2.1, 1.3–3.5), but not to duration of ART or CD4. Only 40% of caregivers accurately perceived their child’s hearing loss. Children with hearing impairment were less likely to attend school and had poorer emotional (p = 0.02) and school functioning (p = 0.04). Conclusions There is an urgent need for improved screening tools, identification and treatment of hearing problems in HIV-infected children, as hearing loss was common in this group and affected school functioning and quality of life. Clear strategies were identified for prevention and treatment, since most

  16. Inner Ear Conductive Hearing Loss and Unilateral Pulsatile Tinnitus Associated with a Dural Arteriovenous Fistula: Case Based Review and Analysis of Relationship between Intracranial Vascular Abnormalities and Inner Ear Fluids

    PubMed Central

    Cassandro, Ettore; Cassandro, Claudia; Sequino, Giuliano; Scarpa, Alfonso; Petrolo, Claudio; Chiarella, Giuseppe

    2015-01-01

    While pulsatile tinnitus (PT) and dural arteriovenous fistula (DAVF) are not rarely associated, the finding of a conductive hearing loss (CHL) in this clinical picture is unusual. Starting from a case of CHL and PT, diagnosed to be due to a DAVF, we analyzed relationship between intracranial vascular abnormalities and inner ear fluids. DAVF was treated with endovascular embolization. Following this, there was a dramatic recovery of PT and of CHL, confirming their cause-effect link with DAVF. We critically evaluated the papers reporting this association. This is the first case of CHL associated with PT and DAVF. We describe the most significant experiences and theories reported in literature, with a personal analysis about the possible relationship between vascular intracranial system and labyrinthine fluids. In conclusion, we believe that this association may be a challenge for otolaryngologists. So we suggest to consider the possibility of a DAVF or other AVMs when PT is associated with CHL, without alterations of tympanic membrane and middle ear tests. PMID:26693371

  17. Hearing, use of hearing protection, and attitudes towards noise among young American adults.

    PubMed

    Widén, S E; Holmes, A E; Johnson, T; Bohlin, M; Erlandsson, S I

    2009-08-01

    The purpose of the present study was to investigate possible associations between college students' attitudes, risk-taking behaviour related to noisy activities, and hearing problems such as threshold shifts or self-experienced hearing symptoms. The sample included 258 students aged between 17 and 21 enrolled at the University of Pennsylvania, USA. A questionnaire measuring attitudes towards noise, use of hearing protection, and self-reported hearing symptoms was distributed among the students. After completing the questionnaire a hearing screening, including pure-tone audiometry and tympanometry, was conducted. The result revealed that 26% had thresholds poorer than the screening level of 20 dBHL. Attitudes were significantly related to self-experienced hearing symptoms, but not to threshold shifts. Attitudes and noise sensitivity was, significantly related to use of hearing protection. Hearing protection use was found in activities such as using firearms, mowing lawns, and when using noisy tools but was less reported for concerts and discotheques. It can be concluded that the young adults in this study expose themselves to hearing risks, since the use of hearing protection is in general very low. PMID:19842807

  18. 29 CFR 102.34 - Who shall conduct; to be public unless otherwise ordered.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Who shall conduct; to be public unless otherwise ordered... Practices 1 Hearings § 102.34 Who shall conduct; to be public unless otherwise ordered. The hearing for the... previously designated to conduct the hearing. Such hearing shall be public unless otherwise ordered by...

  19. Evidence of noise-induced hearing loss in young people studying popular music.

    PubMed

    Barlow, Christopher

    2011-06-01

    The number of students studying popular music, music technology, and sound engineering courses at both school and university to has increased rapidly in the last few years. These students are generally involved in music-making/recording and listening to a high level, usually in environments with amplified music. Recent studies have shown that these students are potentially exposed to a high risk of noise-induced hearing loss (NIHL( and are not covered by the same regulatory framework as employees. This study examined the pure tone air conduction hearing thresholds of 50 undergraduate students, including recent school leavers, on a range of popular music courses, to assess if there was evidence of hearing loss. Forty-four percent of students showed evidence of audiometric notch at 4-6 kHz, and 16% were classified under the UK Occupational Health and Safety guidelines as exhibiting mild hearing loss. Instance of audiometric notch was considerably higher than reported from studies of the general population but was around the same level or lower than that reported from studies of "traditional" music courses and conservatoires, suggesting no higher risk for popular music students than for "classical" music students. No relationship with age was present, suggesting that younger students were as likely to exhibit audiometric notch as mature students. This indicates that these students may be damaging their hearing through leisure activities while still at school, suggesting a need for robust education measures to focus on noise exposure of young people. PMID:21695357

  20. AIR POLLUTION MEASUREMENTS IN THE VICINITY OF THE WORLD TRADE CENTER - SUMMARY OF MEASUREMENTS CONDUCTED BY EPA-ORD

    EPA Science Inventory

    The U.S. Environmental Protection Agency's Office of Research and Development (EPA-ORD) was requested by EPA's Region 2 office in New York on 9/12/01 to assist with air quality monitoring in response to the collapse of the World Trade Center. Scientists at the U.S. EPA-ORD's Nati...

  1. [Decline of speech understanding in the hearing impaired elderly listeners who visited our hearing aid clinic].

    PubMed

    Yasue, Minori; Sugiura, Saiko; Uchida, Yasue; Nakashima, Tsutomu

    2014-08-01

    The aim of this study was to investigate distinctive change in the hearing impaired elderly listeners, especially about speech recognition. Subjects were 525 patients (235 males, 290 females), from 60 to 98 years of age who had visited the Hearing Aid Clinic of Otorhinolaryngology, National Center for Geriatrics and Gerontology Hospital, between June 2001 and December 2012. Pure-tone air conduction threshold determination was administered to each subject. The speech audiometry materials used to define speech discrimination ability were Japanese monosyllabic word lists, 67S word lists. Sex- and age-specific trends in maximum discrimination score (MDS) and rollover index (RI) were shown in this study. RI was computed by the formula (PBmax-PBmin)/PBmax. PBmax has almost the same meaning as MDS in Japan. PBmin represented the lowest PB score above the test intensity level of PBmax. Mean MDSs were 80.8% in their sixties, 75.3% in their seventies, 60.7% in their eighties, and 45.5% in their nineties. The rate of decrease in mean MDS per decade accelerated in the older generation. Mean RIs were 0.18 in patients in their sixties, 0.24 in their seventies, 0.30 in their eighties, and 0.30 in their nineties. It increased until the age of eighties. In the model 1, multiple logistic analyses were performed to examine the effect of age (in 10-year increments), sex and mean hearing levels in pure tone average of values at 500, 1000, 2000, 4000 Hz (in 10 dB increments) on the MDS < 60%. Significant associations were observed between MDS < 60% and age (odds ratio, 3.03; 95% confidence interval, 2.38 to 3.85), and mean hearing levels in pure tone average of values at 500, 1000, 2000, 4000 Hz (2.33; 2.03 to 2.68). Sex was not associated with MDS < 60%. In the model 2, multiple logistic analyses adjusted for age and sex were performed to examine the effect of hearing level at test frequencies of 125, 250, 500, 1000, 2000, 4000, and 8000 Hz (in 10 dB increments)on the MDS < 60

  2. Hearing outcome after sequential cholesteatoma surgery.

    PubMed

    Lailach, Susen; Zahnert, Thomas; Lasurashvili, Nikoloz; Kemper, Max; Beleites, Thomas; Neudert, Marcus

    2016-08-01

    The objective of this study was to assess hearing outcome after sequential cholesteatoma surgery stratified for exclusively transcanal technique (ETC), combined transcanal and transmastoidal technique (TCM) and canal wall down surgery (CWD) and to analyze the impact of ossicular reconstruction technique (partial ossicular replacement prostheses/PORP and total ossicular replacement prostheses/TORP) on hearing outcome. This study is a retrospective case review and clinical case study conducted in a tertiary referral center. Patients who underwent 376 cholesteatoma surgeries (2007-2009) and 92 ears in clinical re-examination at least 12 months postoperatively were included. Sequential cholesteatoma surgery with ETC, TCM, or CWD; ossiculoplasty with PORP or TORP were the interventions administered. Pre- and postoperative air-bone gap (ABG) and air conduction threshold (AC) for 0.5-3 kHz were the main outcome measures. Overall, the mean preoperative ABG decreased from 25.3 ± 1.3 to 19.8 ± 0.9 dB with a mean ABG closure of 5.4 ± 1.3 dB (p ≤ 0.001). According to surgical technique, the postoperative ABG after CWD 23.5 ± 2.1 was significantly worse compared to ETC (17.3 ± 1.0 dB, p < 0.05) and TCM (19.4 ± 1.3 dB). A significant ABG closure was observed after ETC (6.8 ± 2.0 dB, p < 0.01) and TCM (6.5 ± 2.0 dB, p < 0.01) contrary to CWD (2.1 ± 2.9 dB, p > 0.05). Patients receiving PORP showed a significantly less ABG postoperatively (19.0 ± 0.9 dB, p ≤ 0.05) compared to the TORP group (24.1 ± 2.5 dB). However, a significant hearing gain was assessed after PORP- (4.7 ± 1.6 dB, p ≤ 0.01) and TORP- implantation (10.4 ± 3.7 dB, p ≤ 0.01). Sequential cholesteatoma surgery allowed for an excellent hearing outcome postoperatively. An intact posterior canal wall and a present stapes suprastructure were identified to predict a significantly superior hearing result. In addition to the technical and prosthetic

  3. Tympanic membrane perforation descriptors and hearing levels in otitis media.

    PubMed

    Prasansuk, S; Hinchcliffe, R

    1982-01-01

    The air conduction threshold of hearing was determined at 0.5,1 and 2 kHz by manual audiometry on a consecutive series of young Thai adults with bilateral chronic suppurative otitis media. At the same time, after visual inspection of each tympanic membrane, the perforation was drawn, as faithfully as possible in respect of both shape and relative size, on a 40-mm diagram of a tympanic membrane. A study of the shapes of perforations showed that they could be described as elliptical, reniform or cardioid. For the purposes of calculating the area of a perforation, a reniform perforation was considered to be the result of substracting a smaller ellipse from a larger ellipse, which ellipses were in contact at the point of least curvature. The hearing threshold level was found to be a function of the size of the perforation. A power function best described this relationship. The relationship was such that a total perforation would be associated with a hearing loss of about 60 dB HL over the frequency range 0.5-2 kHz. PMID:7055479

  4. Noise-Induced Hearing Loss

    MedlinePlus

    ... Info » Hearing, Ear Infections, and Deafness Noise-Induced Hearing Loss On this page: What is noise-induced hearing ... additional information about NIHL? What is noise-induced hearing loss? Every day, we experience sound in our environment, ...

  5. Auditory development and hearing evaluation in children.

    PubMed

    Stockard-Pope, J E

    2001-01-01

    This chapter provides an overview of (1) developmental timetables relevant to hearing, and (2) current pediatric audiological techniques and practices. Structural and functional development of the auditory pathway and the development of primary auditory processing are summarized. These developmental sequences appear to follow similar paths in humans and animals. Speech and music perception involve more complex processing and are strongly influenced by experience. Hearing disorders affect the perception of complex sounds in a variety of ways, depending on the sites of lesions. Early-onset hearing impairment, including conductive loss from chronic otitis media, can seriously impede language development. Language cannot develop normally without adequate speech stimulation, and deafness is more prevalent than any other handicapping condition for which mandated neonatal screening programs exist. Sensitive and inexpensive techniques are available for performing neonatal hearing screening, and early intervention has a documented positive effect on development of language skills in hearing-impaired children. Thus, the National Institutes of Health has recommended nationwide universal neonatal hearing screening. The rationale for and the methodology of universal screening programs are summarized. Advances in the genetics of hearing impairment are reviewed. Data from these studies have influenced testing and rehabilitative protocols and have implications for future prevention and treatment of hearing impairment. PMID:11480760

  6. A comparison study of educational involvement of hearing parents of deaf and hearing children of elementary school age.

    PubMed

    Powers, G W; Saskiewicz, J A

    1998-03-01

    This study was conducted to determine if a difference exists in level of educational involvement between hearing parents of deaf children and hearing parents of hearing children. Participating parents were asked to complete a 23-question survey about their involvement in their children's education over the past year. Neither group of parents demonstrated a significantly higher level of involvement in their children's education. However, parents of deaf children observed their children in the classroom more than parents of hearing children; parents of hearing children volunteered in their child's classroom more than parents of deaf children. PMID:9557331

  7. 40 CFR 72.67 - Opportunity for public hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 16 2010-07-01 2010-07-01 false Opportunity for public hearing. 72.67 Section 72.67 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) PERMITS REGULATION Federal Acid Rain Permit Issuance Procedures § 72.67 Opportunity for public hearing. (a) During the public comment...

  8. 40 CFR 91.512 - Request for public hearing.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 20 2014-07-01 2013-07-01 true Request for public hearing. 91.512 Section 91.512 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF EMISSIONS FROM MARINE SPARK-IGNITION ENGINES Manufacturer Production Line Testing Program § 91.512 Request for public hearing. (a)...

  9. 40 CFR 60.539 - Hearing and appeal procedures.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 6 2011-07-01 2011-07-01 false Hearing and appeal procedures. 60.539 Section 60.539 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS... Wood Heaters § 60.539 Hearing and appeal procedures. (a)(1) In any case where the Administrator—...

  10. 40 CFR 60.539 - Hearing and appeal procedures.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 6 2010-07-01 2010-07-01 false Hearing and appeal procedures. 60.539 Section 60.539 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS... Wood Heaters § 60.539 Hearing and appeal procedures. (a)(1) In any case where the Administrator—...

  11. 40 CFR 78.14 - Evidentiary hearing procedure.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 17 2013-07-01 2013-07-01 false Evidentiary hearing procedure. 78.14 Section 78.14 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPEAL PROCEDURES § 78.14 Evidentiary hearing procedure. (a) If a request for an...

  12. 40 CFR 78.15 - Motions in evidentiary hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 17 2013-07-01 2013-07-01 false Motions in evidentiary hearings. 78.15 Section 78.15 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPEAL PROCEDURES § 78.15 Motions in evidentiary hearings. (a) Any party may make a motion to...

  13. Electric field variations measured continuously in free air over a conductive thin zone in the tilted Lias-epsilon black shales near Osnabrück, Northwest Germany

    NASA Astrophysics Data System (ADS)

    Gurk, M.; Bosch, F. P.; Tougiannidis, N.

    2013-04-01

    Common studies on the static electric field distribution over a conductivity anomaly use the self-potential method. However, this method is time consuming and requires nonpolarizable electrodes to be placed in the ground. Moreover, the information gained by this method is restricted to the horizontal variations of the electric field. To overcome the limitation in the self-potential technique, we conducted a field experiment using a non conventional technique to assess the static electric field over a conductivity anomaly. We use two metallic potential probes arranged on an insulated boom with a separation of 126 cm. When placed into the electric field of the free air, a surface charge will be induced on each probe trying to equalize with the potential of the surrounding atmosphere. The use of a plasma source at both probes facilitated continuous and quicker measurement of the electric field in the air. The present study shows first experimental measurements with a modified potential probe technique (MPP) along a 600-meter-long transect to demonstrate the general feasibility of this method for studying the static electric field distribution over shallow conductivity anomalies. Field measurements were carried out on a test site on top of the Bramsche Massif near Osnabrück (Northwest Germany) to benefit from a variety of available near surface data over an almost vertical conductivity anomaly. High resolution self-potential data served in a numerical analysis to estimate the expected individual components of the electric field vector. During the experiment we found more anomalies in the vertical and horizontal components of the electric field than self-potential anomalies. These contrasting findings are successfully cross-validated with conventional near surface geophysical methods. Among these methods, we used self-potential, radiomagnetotelluric, electric resistivity tomography and induced polarization data to derive 2D conductivity models of the subsurface in

  14. A prospective study on radiation-induced changes in hearing function

    SciTech Connect

    Herrmann, Franziska; Doerr, Wolfgang; Mueller, Rainer; Herrmann, Thomas . E-mail: thomas.herrmann@mailbox.tu-dresden.de

    2006-08-01

    Purpose: To quantitate changes in hearing function after radiotherapy for head-and-neck tumors. Methods and Materials: At the Department of Radiotherapy and Radiation Oncology, 32 patients were irradiated for head-and-neck tumors. Three-dimensional treatment planning was applied. Total tumor doses were 30.0-77.6 Gy, local doses to the inner ear (n = 64) ranged from 1.7 to 64.3 Gy. Audiometry was performed before the onset of radiotherapy (RT), at a tumor dose of 40 Gy or at the end of palliative treatment, at the end of curative RT, and 2-6 months post-RT. Assays applied were frequency-specific threshold measurements for air and bone conduction, measurements according to Weber and Rinne, tympanometry and assessment of the stapedius reflex. Results: Age and prior disease significantly decreased, whereas previous or concurrent alcohol consumption significantly increased hearing ability. A significant reduction in hearing ability during RT was found for high frequencies (at 40 Gy) and low frequencies (at end of RT), which persisted after RT. No differences were observed for air or bone conduction. None of the other assays displayed time- or dose-dependent changes. Dose-effect analyses revealed an ED50 (dose at which a 50% incidence is expected) for significant changes in hearing thresholds (15 dB) in the range of 20-25 Gy, with large confidence limits. Conclusions: Radiation effects on hearing ability were confined to threshold audiogram values, which started during the treatment without reversibility during 6 months postradiotherapy.

  15. Leaf conductance decreased under free-air CO2 enrichment (FACE) for three perennials in the Nevada desert

    USGS Publications Warehouse

    Nowak, R.S.; DeFalco, L.A.; Wilcox, C.S.; Jordan, D.N.; Coleman, J.S.; Seemann, J.R.; Smith, S.D.

    2001-01-01

    A common response of plants to elevated atmospheric CO2 concentration (CO2) is decreased leaf conductance. Consequently, leaf temperature is predicted to increase under elevated CO2. Diurnal patterns of leaf conductance and temperature were measured for three desert perennials, the C3 shrub Larrea tridentata, C3 tussock grass Achnatherum hymenoides and C4 tussock grass Pleuraphis rigida, at the Nevada Desert FACE facility. Measurements were made on ambient and c. 550 ??mol mol-1 CO2 plots through both a wet and dry year. Reductions in conductance were 35%, 20% and 13% for Pleuraphis, Achnatherum and Larrea, respectively. Decreased conductance occurred throughout the day only for Pleuraphis. Both C3 species had smaller CO2 effects during dry periods than wet. Leaf temperature did not differ significantly between elevated and ambient CO2 for any species. Comparisons of blower-control and nonring plots indicated that the FACE apparatus did not confound our results. All three species exhibited decreased leaf conductance under elevated CO2, although reductions were not uniform during the day or among years. Nonetheless, leaf energy balance was only minimally changed for these microphyllous desert perennials.

  16. Pure tone hearing thresholds and leisure noise: Is there a relationship?

    PubMed Central

    Williams, Warwick; Carter, Lyndal; Seeto, Mark

    2015-01-01

    This paper reports on the examination of the relationship between self-reported historical noise exposure during leisure activities and audiological indicators: Measured hearing threshold levels (HTLs) and otoacoustic emissions (OAEs). The research was conducted by a cross-sectional survey of 1,432 individuals whose ages ranged from 11 years to 35 years. Methodology included a comprehensive audiometric assessment including otoscopy, pure tone audiometry (PTA) (air- and bone-conduction), OAEs, and tympanometry. A comprehensive questionnaire gathered information on demographics, hearing health status, and participation in work, nonwork, and leisure activities. Using the history of work, nonwork, and leisure noise exposure, a cumulative lifetime noise exposure was estimated. No correlation was found between cumulative lifetime noise exposure and audiometric PTA or OAE parameters. PMID:26356379

  17. 21 CFR 801.420 - Hearing aid devices; professional and patient labeling.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... special training to diagnose and treat hearing loss. Such physicians are also known as otolaryngologists... rapidly progressive hearing loss within the previous 90 days. (iv) Acute or chronic dizziness. (v) Unilateral hearing loss of sudden or recent onset within the previous 90 days. (vi) Audiometric air-bone...

  18. 21 CFR 801.420 - Hearing aid devices; professional and patient labeling.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... special training to diagnose and treat hearing loss. Such physicians are also known as otolaryngologists... rapidly progressive hearing loss within the previous 90 days. (iv) Acute or chronic dizziness. (v) Unilateral hearing loss of sudden or recent onset within the previous 90 days. (vi) Audiometric air-bone...

  19. 21 CFR 801.420 - Hearing aid devices; professional and patient labeling.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... special training to diagnose and treat hearing loss. Such physicians are also known as otolaryngologists... rapidly progressive hearing loss within the previous 90 days. (iv) Acute or chronic dizziness. (v) Unilateral hearing loss of sudden or recent onset within the previous 90 days. (vi) Audiometric air-bone...

  20. 21 CFR 801.420 - Hearing aid devices; professional and patient labeling.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... special training to diagnose and treat hearing loss. Such physicians are also known as otolaryngologists... rapidly progressive hearing loss within the previous 90 days. (iv) Acute or chronic dizziness. (v) Unilateral hearing loss of sudden or recent onset within the previous 90 days. (vi) Audiometric air-bone...

  1. 40 CFR 78.13 - Scheduling orders and pre-hearing conferences.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 16 2011-07-01 2011-07-01 false Scheduling orders and pre-hearing conferences. 78.13 Section 78.13 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) APPEAL PROCEDURES § 78.13 Scheduling orders and pre-hearing conferences. (a) If a request for an evidentiary hearing...

  2. Hearing Aid Assembly

    NASA Technical Reports Server (NTRS)

    Grugel, Richard N. (Inventor)

    2002-01-01

    Progress in hearing aids has come a long way. Yet despite such progress hearing aids are not the perfect answer to many hearing problems. Some adult ears cannot accommodate tightly fitting hearing aids. Mouth movements such as chewing, talking, and athletic or other active endeavors also lead to loosely fitting ear molds. It is well accepted that loosely fitting hearing aids are the cause of feedback noise. Since feedback noise is the most common complaint of hearing aid wearers it has been the subject of various patents. Herein a hearing aid assembly is provided eliminating feedback noise. The assembly includes the combination of a hearing aid with a headset developed to constrict feedback noise.

  3. Living with hearing loss

    MedlinePlus

    ... medlineplus.gov/ency/patientinstructions/000360.htm Living with hearing loss To use the sharing features on this page, please enable JavaScript. If you are living with hearing loss, you know that it takes extra effort to ...

  4. Hearing Loss: Screening Newborns

    MedlinePlus

    ... of this page please turn JavaScript on. Feature: Hearing Loss Screening Newborns Past Issues / Spring 2015 Table of ... of newborns in the U.S. are screened for hearing loss before they leave the hospital. Research improves the ...

  5. Genetics of Hearing Loss

    MedlinePlus

    ... in Latin America Information For... Media Policy Makers Genetics of Hearing Loss Language: English Español (Spanish) Recommend ... of hearing loss in babies is due to genetic causes. There are also a number of things ...

  6. Genes and Hearing Loss

    MedlinePlus

    ... Meeting Calendar Find an ENT Doctor Near You Genes and Hearing Loss Genes and Hearing Loss Patient ... mutation may only have dystopia canthorum. How Do Genes Work? Genes are a road map for the ...

  7. Can Baby Hear?

    MedlinePlus

    ... 000 children born in the United States are deaf or hard-of-hearing. Research shows that early ... to this, the average age of identification for deaf and hearing impaired children was close to three ...

  8. Hearing Disorders and Deafness

    MedlinePlus

    ... If you have trouble hearing, you can get help. Possible treatments include hearing aids, cochlear implants, special training, certain medicines, and surgery. NIH: National Institute on Deafness and Other Communication Disorders

  9. Power supplies for hearing aids.

    PubMed

    Knutsen, J E

    1982-08-01

    The design of a hearing-aid system involves three disciplines of applied science--electrochemistry, electrical engineering and audio engineering. This paper is concerned with the interface between the first two. Batteries are essentially non-linear components. Optimum performance is only achievable when the electrical requirements of the hearing aid are closely matched with the voltage, rate capability and impedance of the battery. After years of optimalization, the modern '675' button cell has earned universal acceptability and is now used in most 'behind-the-ear' hearing aids. When more power is required, the larger and less specialized LR6 'penlight' cell is typically specified. Higher voltage might lead to better circuit efficiency, and there is some pressure to introduce a 3 V lithium-based product. Lithium should give superior energy density, but there are problems which remain to be solved. In the end, it is quite possible that the market might settle for an ecologically acceptable long-life lower voltage metal-air cell. If so, the recent zinc-air system may well have a future and could conceivably succeed both the mercury '675' and the alkaline 'penlight' cells. PMID:7171873

  10. The Hearing Mechanism

    ERIC Educational Resources Information Center

    Sherbon, James W.

    1978-01-01

    An examination of the hearing mechanism and some of the factors involved in helping problems may offer encouragement for a regular schedule of hearing maintenance. It may also help music educators to become more aware and understanding of their own and students' hearing as it affects musical behavior. (Author)

  11. Rehabilitation of Hearing.

    ERIC Educational Resources Information Center

    World Federation of the Deaf, Rome (Italy).

    Rehabilitation of hearing is considered in five conference papers. Two papers come from Poland: "Rehabilitation of Hearing in Children 'Deaf' in First 5 Years of Age" by D. Borkowska-Gaertig and others and "Possibilities of Hearing Improvement in Adults with Conservative Methods" by T. Bystrzanowska. Also included are "Re-Education and…

  12. Hearing-aid tester

    NASA Technical Reports Server (NTRS)

    Kessinger, R.; Polhemus, J. T.; Waring, J. G.

    1977-01-01

    Hearing aids are automatically checked by circuit that applies half-second test signal every thirty minutes. If hearing-aid output is distorted, too small, or if battery is too low, a warning lamp is activated. Test circuit is incorporated directly into hearing-aid package.

  13. Hearing Problems in Children

    MedlinePlus

    ... age 6 months. That's because children start learning speech and language long before they talk. Hearing problems can be temporary or permanent. Sometimes, ear infections, injuries or diseases affect hearing. If your child does not hear well, get help. NIH: National ...

  14. ABE. The Hearing Impaired.

    ERIC Educational Resources Information Center

    Carver, L. Sue

    This handbook was written to help teachers of adult basic education (ABE) adapt their teaching methods for hearing impaired persons. Written in a narrative format, the guide covers the following topics: ABE for the hearing impaired, hints for working with the hearing impaired without an interpreter, peer pairing, interpreters in the classroom…

  15. Implementing Hearing Safety

    ERIC Educational Resources Information Center

    Cliffe, Roger

    1978-01-01

    Hearing damage from noise exposure and approaches to implementing hearing safety in school industrial laboratories through noise reduction and protective equipment are discussed. Although all states have not adopted the Occupational Safety and Health Act, teachers should be aware of noise hazards and act to protect hearing. (MF)

  16. Hearing Conservation Medical Program

    NASA Technical Reports Server (NTRS)

    1993-01-01

    Background on hearing impairment is presented including causes and criteria for safe noise levels. The purpose of the Hearing Conservation Program at LeRC is outlined, and the specifics of the Medical Surveillance Program for Hearing Impairment at LeRC are discussed.

  17. [Bone Conduction and Active Middle Ear Implants].

    PubMed

    Volkenstein, S; Thomas, J P; Dazert, S

    2016-05-01

    The majority of patients with moderate to severe hearing loss can be supplied with conventional hearing aids depending on severity and cause for hearing loss in a satisfying way. However, some patients either do not benefit enough from conventional hearing aids or cannot wear them due to inflammatory reactions and chronic infections of the external auditory canal or due to anatomical reasons. For these patients there are fully- and semi-implantable middle ear and bone conduction implants available. These devices either directly stimulate the skull (bone conduction devices), middle ear structures (active middle ear implants) or the cochlea itself (direct acoustic stimulation). Patients who failed surgical hearing rehabilitation or do not benefit from conventional hearing aids may achieve a significant better speech understanding and tremendous improvement in quality of life by implantable hearing devices with careful attention to the audiological and anatomical indication criteria. PMID:27135430

  18. A perovskite oxide with high conductivities in both air and reducing atmosphere for use as electrode for solid oxide fuel cells.

    PubMed

    Lan, Rong; Cowin, Peter I; Sengodan, Sivaprakash; Tao, Shanwen

    2016-01-01

    Electrode materials which exhibit high conductivities in both oxidising and reducing atmospheres are in high demand for solid oxide fuel cells (SOFCs) and solid oxide electrolytic cells (SOECs). In this paper, we investigated Cu-doped SrFe0.9Nb0.1O3-δ finding that the primitive perovskite oxide SrFe0.8Cu0.1Nb0.1O3-δ (SFCN) exhibits a conductivity of 63 Scm(-1)and 60 Scm(-1) at 415 °C in air and 5%H2/Ar respectively. It is believed that the high conductivity in 5%H2/Ar is related to the exsolved Fe (or FeCu alloy) on exposure to a reducing atmosphere. To the best of our knowledge, the conductivity of SrFe0.8Cu0.1Nb0.1O3-δ in a reducing atmosphere is the highest of all reported oxides which also exhibit a high conductivity in air. Fuel cell performance using SrFe0.8Cu0.1Nb0.1O3-δ as the anode, (Y2O3)0.08(ZrO2)0.92 as the electrolyte and La0.8Sr0.2FeO3-δ as the cathode achieved a power density of 423 mWcm(-2) at 700 °C indicating that SFCN is a promising anode for SOFCs. PMID:27545200

  19. A perovskite oxide with high conductivities in both air and reducing atmosphere for use as electrode for solid oxide fuel cells

    PubMed Central

    Lan, Rong; Cowin, Peter I.; Sengodan, Sivaprakash; Tao, Shanwen

    2016-01-01

    Electrode materials which exhibit high conductivities in both oxidising and reducing atmospheres are in high demand for solid oxide fuel cells (SOFCs) and solid oxide electrolytic cells (SOECs). In this paper, we investigated Cu-doped SrFe0.9Nb0.1O3−δ finding that the primitive perovskite oxide SrFe0.8Cu0.1Nb0.1O3−δ (SFCN) exhibits a conductivity of 63 Scm−1and 60 Scm−1 at 415 °C in air and 5%H2/Ar respectively. It is believed that the high conductivity in 5%H2/Ar is related to the exsolved Fe (or FeCu alloy) on exposure to a reducing atmosphere. To the best of our knowledge, the conductivity of SrFe0.8Cu0.1Nb0.1O3−δ in a reducing atmosphere is the highest of all reported oxides which also exhibit a high conductivity in air. Fuel cell performance using SrFe0.8Cu0.1Nb0.1O3−δ as the anode, (Y2O3)0.08(ZrO2)0.92 as the electrolyte and La0.8Sr0.2FeO3−δ as the cathode achieved a power density of 423 mWcm−2 at 700 °C indicating that SFCN is a promising anode for SOFCs. PMID:27545200

  20. 29 CFR 0.737-6 - Time, date and place of hearing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Employment Conflict of Interest § 0.737-6 Time, date and place of hearing. (a) Any hearing shall be conducted... properly, and (2) An expeditious resolution of allegations that may be damaging to his or her reputation....

  1. 29 CFR 0.737-6 - Time, date and place of hearing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Employment Conflict of Interest § 0.737-6 Time, date and place of hearing. (a) Any hearing shall be conducted... properly, and (2) An expeditious resolution of allegations that may be damaging to his or her reputation....

  2. 32 CFR 865.109 - Procedures for hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE ORGANIZATION AND MISSION-GENERAL PERSONNEL REVIEW BOARDS Air Force Discharge Review Board § 865.109 Procedures for hearings. (a...) Except as otherwise authorized by the Secretary of the Air Force, further opportunity for a...

  3. 32 CFR 865.109 - Procedures for hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE ORGANIZATION AND MISSION-GENERAL PERSONNEL REVIEW BOARDS Air Force Discharge Review Board § 865.109 Procedures for hearings. (a...) Except as otherwise authorized by the Secretary of the Air Force, further opportunity for a...

  4. 32 CFR 865.109 - Procedures for hearings.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE ORGANIZATION AND MISSION-GENERAL PERSONNEL REVIEW BOARDS Air Force Discharge Review Board § 865.109 Procedures for hearings. (a...) Except as otherwise authorized by the Secretary of the Air Force, further opportunity for a...

  5. Safety of the HyperSound® Audio System in Subjects with Normal Hearing.

    PubMed

    Mehta, Ritvik P; Mattson, Sara L; Kappus, Brian A; Seitzman, Robin L

    2015-06-11

    The objective of the study was to assess the safety of the HyperSound® Audio System (HSS), a novel audio system using ultrasound technology, in normal hearing subjects under normal use conditions; we considered pre-exposure and post-exposure test design. We investigated primary and secondary outcome measures: i) temporary threshold shift (TTS), defined as >10 dB shift in pure tone air conduction thresholds and/or a decrement in distortion product otoacoustic emissions (DPOAEs) >10 dB at two or more frequencies; ii) presence of new-onset otologic symptoms after exposure. Twenty adult subjects with normal hearing underwent a pre-exposure assessment (pure tone air conduction audiometry, tympanometry, DPOAEs and otologic symptoms questionnaire) followed by exposure to a 2-h movie with sound delivered through the HSS emitter followed by a post-exposure assessment. No TTS or new-onset otological symptoms were identified. HSS demonstrates excellent safety in normal hearing subjects under normal use conditions. PMID:26779330

  6. Safety of the HyperSound® Audio System in Subjects with Normal Hearing

    PubMed Central

    Mattson, Sara L.; Kappus, Brian A.; Seitzman, Robin L.

    2015-01-01

    The objective of the study was to assess the safety of the HyperSound® Audio System (HSS), a novel audio system using ultrasound technology, in normal hearing subjects under normal use conditions; we considered pre-exposure and post-exposure test design. We investigated primary and secondary outcome measures: i) temporary threshold shift (TTS), defined as >10 dB shift in pure tone air conduction thresholds and/or a decrement in distortion product otoacoustic emissions (DPOAEs) >10 dB at two or more frequencies; ii) presence of new-onset otologic symptoms after exposure. Twenty adult subjects with normal hearing underwent a pre-exposure assessment (pure tone air conduction audiometry, tympanometry, DPOAEs and otologic symptoms questionnaire) followed by exposure to a 2-h movie with sound delivered through the HSS emitter followed by a post-exposure assessment. No TTS or new-onset otological symptoms were identified. HSS demonstrates excellent safety in normal hearing subjects under normal use conditions. PMID:26779330

  7. Hearing loss in workers exposed to epoxy adhesives and noise: a cross-sectional study

    PubMed Central

    Yang, Hsiao-Yu; Shie, Ruei-Hao; Chen, Pau-Chung

    2016-01-01

    Objectives Epoxy adhesives contain organic solvents and are widely used in industry. The hazardous effects of epoxy adhesives remain unclear. The objective of this study was to investigate the risk of hearing loss among workers exposed to epoxy adhesives and noise. Design Cross-sectional study. Methods For this cross-sectional study, we recruited 182 stone workers who were exposed to both epoxy adhesives and noise, 89 stone workers who were exposed to noise only, and 43 workers from the administrative staff who had not been exposed to adhesives or noise. We obtained demographic data, occupational history and medical history through face-to-face interviews and arranged physical examinations and pure-tone audiometric tests. We also conducted walk-through surveys in the stone industry. A total of 40 representative noise assessments were conducted in 15 workplaces. Air sampling was conducted at 40 workplaces, and volatile organic compounds were analysed using the Environmental Protection Agency (EPA) TO-15 method. Results The mean sound pressure level was 87.7 dBA (SD 9.9). The prevalence of noise-induced hearing loss was considerably increased in the stone workers exposed to epoxy adhesives (42%) compared with the stone workers who were not exposed to epoxy adhesives (21%) and the administrative staff group (9.3%). A multivariate logistic regression analysis revealed that exposure to epoxy adhesives significantly increased the risk of hearing loss between 2 and 6 kHz after adjusting for age. Significant interactions between epoxy adhesives and noise and hearing impairment were observed at 3, 4 and 6 kHz. Conclusions Epoxy adhesives exacerbate hearing impairment in noisy environments, with the main impacts occurring in the middle and high frequencies. PMID:26892792

  8. Hearing loss in space

    NASA Technical Reports Server (NTRS)

    Buckey, J. C. Jr; Musiek, F. E.; Kline-Schoder, R.; Clark, J. C.; Hart, S.; Havelka, J.

    2001-01-01

    BACKGROUND: Temporary and, in some cases, permanent hearing loss has been documented after long-duration spaceflights. METHODS: We examined all existing published data on hearing loss after space missions to characterize the losses. RESULTS: Data from Russian missions suggest that the hearing loss, when it occurs, affects mainly mid to high frequencies and that using hearing protection often might prevent the loss. Several significant questions remain about hearing loss in space. While the hearing loss has been presumed to be noise-induced, no clear link has been established between noise exposure and hearing loss during spaceflight. In one documented case of temporary hearing loss from the Shuttle-Mir program, the pattern of loss was atypical for a noise-induced loss. Continuous noise levels that have been measured on the Mir and previous space stations, while above engineering standards, are not at levels usually associated with hearing loss in ground-based studies (which have usually been limited to 8-10 h exposure periods). Attempts to measure hearing in space using threshold-based audiograms have been unsuccessful in both the American and Russian programs due to noise interference with the measurements. CONCLUSIONS: The existing data highlight the need for reliable monitoring of both hearing and noise in long-duration spaceflight.

  9. 40 CFR 92.709 - Public hearings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... an Administrative Law Judge appointed pursuant to 5 U.S.C. 3105 (see also 5 CFR part 930). (6... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Public hearings. 92.709 Section 92.709 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF...

  10. 40 CFR 89.514 - Hearing procedures.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Hearing procedures. 89.514 Section 89.514 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES Selective...

  11. 40 CFR 94.216 - Hearing procedures.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Hearing procedures. 94.216 Section 94.216 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF EMISSIONS FROM MARINE COMPRESSION-IGNITION ENGINES Certification Provisions § 94.216...

  12. 40 CFR 89.514 - Hearing procedures.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 20 2011-07-01 2011-07-01 false Hearing procedures. 89.514 Section 89.514 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES Selective...

  13. 40 CFR 85.1807 - Public hearings.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... (see also 5 CFR part 930 as amended). (6) “Environmental Appeals Board” shall mean the Board within the...) CONTROL OF AIR POLLUTION FROM MOBILE SOURCES Recall Regulations § 85.1807 Public hearings. (a) Definitions.... (3) “Manufacturer” refers to a manufacturer contesting a recall order directed at that...

  14. 40 CFR 85.1807 - Public hearings.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... (see also 5 CFR part 930 as amended). (6) “Environmental Appeals Board” shall mean the Board within the...) CONTROL OF AIR POLLUTION FROM MOBILE SOURCES Recall Regulations § 85.1807 Public hearings. (a) Definitions.... (3) “Manufacturer” refers to a manufacturer contesting a recall order directed at that...

  15. 40 CFR 85.1807 - Public hearings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... (see also 5 CFR part 930 as amended). (6) “Environmental Appeals Board” shall mean the Board within the...) CONTROL OF AIR POLLUTION FROM MOBILE SOURCES Recall Regulations § 85.1807 Public hearings. (a) Definitions.... (3) “Manufacturer” refers to a manufacturer contesting a recall order directed at that...

  16. 40 CFR 85.1807 - Public hearings.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... (see also 5 CFR part 930 as amended). (6) “Environmental Appeals Board” shall mean the Board within the...) CONTROL OF AIR POLLUTION FROM MOBILE SOURCES Recall Regulations § 85.1807 Public hearings. (a) Definitions.... (3) “Manufacturer” refers to a manufacturer contesting a recall order directed at that...

  17. High-frequency hearing in phocid and otariid pinnipeds: an interpretation based on inertial and cochlear constraints (L).

    PubMed

    Hemilä, Simo; Nummela, Sirpa; Berta, Annalisa; Reuter, Tom

    2006-12-01

    Audiograms in air and underwater, determined by previous workers for four pinniped species, two eared seals (Otariidae) and two phocids (Phocidae), are supplemented here by measurements on their middle ear ossicular mass, enabling mechanistic interpretations of high-frequency hearing and audiogram differences. Otariid hearing is not largely affected by the medium (air/water). This indicates that cochlear constraints limit high-frequency hearing in otariids. Phocids, however, have massive middle ear ossicles, and underwater hearing has radically shifted towards higher frequencies. This suggests that the high-frequency hearing of phocids in air is constrained by ossicle inertia. PMID:17225374

  18. A morphology, porosity and surface conductive layer optimized MnCo2O4 microsphere for compatible superior Li(+) ion/air rechargeable battery electrode materials.

    PubMed

    Yun, Young Jun; Kim, Jin Kyu; Ju, Ji Young; Unithrattil, Sanjith; Lee, Sun Sook; Kang, Yongku; Jung, Ha-Kyun; Park, Jin-Seong; Im, Won Bin; Choi, Sungho

    2016-03-15

    Uniform surface conductive layers with porous morphology-conserved MnCo2O4 microspheres are successfully synthesized, and their electrochemical performances are thoroughly investigated. It is found that the microwave-assisted hydrothermally grown MnCo2O4 using citric acid as the carbon source shows a maximum Li(+) ion lithiation/delithiation capacity of 501 mA h g(-1) at 500 mA g(-1) with stable capacity retention. Besides, the given microsphere compounds are effectively activated as air cathode catalysts in Li-O2 batteries with reduced charge overpotentials and improved cycling performance. We believe that such an affordable enhanced performance results from the appropriate quasi-hollow nature of MnCo2O4 microspheres, which can effectively mitigate the large volume change of electrodes during Li(+) migration and/or enhance the surface transport of the LiOx species in Li-air batteries. Thus, the rationally designed porous media for the improved Li(+) electrochemical reaction highlight the importance of the 3D macropores, the high specific area and uniformly overcoated conductive layer for the promising Li(+) redox reaction platforms. PMID:26877264

  19. AIDS Epidemic. Hearing before the Committee on Labor and Human Resources. United States Senate, One Hundredth Congress, First Session on Reviewing Federal Efforts Being Conducted toward Combating the AIDS Epidemic.

    ERIC Educational Resources Information Center

    Congress of the U.S., Washington, DC. Senate Committee on Labor and Human Resources.

    The text of a Senate hearing called to review federal efforts combating acquired immune deficiency syndrome (AIDS) is presented in this document. Opening statements reviewing the AIDS crisis are given by Senators Edward Kennedy and Lowell Weicker, Jr. Prepared statements are included by Senators Orrin Hatch and Ted Stevens. David Baltimore and…

  20. Prognostic factors for long-term hearing preservation after canal-tympanoplasty for congenital aural atresia.

    PubMed

    Sakamoto, Takashi; Kikuta, Shu; Kikkawa, Yayoi S; Kinoshita, Makoto; Saito, Yuki; Kobayashi, Kenya; Kakigi, Akinobu; Suzuki, Mitsuya; Yamasoba, Tatsuya

    2015-11-01

    The present study aimed to determine favorable prognostic factors for long-term postoperative hearing outcome after canal-tympanoplasty for congenital aural atresia (CAA). We retrospectively reviewed pre and postoperative hearing results and image findings of 51 ears with CAA performed by canal-tympanoplasty for primary repair. Averages of the postoperative air and bone-conduction thresholds, and the air-bone gap (ABG) were calculated from the last pure-tone audiometry. Follow-up duration ranged from 16 to 139 months. A successful hearing result was defined as a postoperative ABG of ≤15 dB, or a postoperative pure-tone average of ≤30 dB. The influence of the following factors on the success of surgery was assessed by multivariate logistic regression analysis: total Jahrsdoerfer grading system score, age at surgery, and dimensions of middle ear including incudostapedial joint angulation, mesotympanic height, mesotympanic width, mesotympanic depth, mesotympanic area, mesotympanic volume, reconstructable external auditory canal (EAC) diameter, and reconstructable EAC height. Successful hearing outcomes were achieved in 24 of 51 ears (47.1%). A multivariate logistic regression analysis showed that an EAC area >72.3 mm(2) was the most significant favorable predictive factor (P = 0.006), followed by mesotympanic depth >5.5 mm (P = 0.013), mesotympanic height >4.6 mm (P = 0.016), and EAC diameter >9.5 mm (P = 0.029). In conclusion, the size of the reconstructable EAC and mesotympanum is important for predicting long-term favorable hearing outcome following canal-tympanoplasty for CAA. PMID:25323150