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1

Hard plastic cladding fiber (HPCF) based optical components for high speed short reach optical communications  

Microsoft Academic Search

We developed the primary components applicable to HPCF links for short reach (SR) and very short reach (VSR) data communication systems. We fabricated 4x4 HPCF fused taper splitter, HPCF pigtailed VCSEL and PIN photodiode for high speed short reach communications and characterized back to back transmission performance of the link composed of these components by measuring eye diagrams and jitters.

Jun Ki Kim; Dong Uk Kim; Tae Young Kim; Chang Soo Park; Kyunghwan Oh

2006-01-01

2

Short communication Evidence for fatal  

E-print Network

Short communication Evidence for fatal collisions and kleptoparasitism while plunge Bag 11-222, Palmerston North, New Zealand Plunge-diving is a highly successful strategy for dealing- sion between conspecifics in plunge-diving Australasian Gannets Morus serrator and Cape Gannets Morus

Stockin, Karen

3

COMMUNICATION Short communication articles are short scientific entities often dealing  

E-print Network

SHORT COMMUNICATION Short communication articles are short scientific entities often dealing articles Does the use of vaginal-implant transmitters affect neonate survival rate of white-tailed deer.G. & Tardiff, J.A. 2008: Does the use of vaginal-implant transmitters affect neonate survival rate of white

4

Hard plastic cladding fiber (HPCF) based optical components for high speed short reach optical communications  

NASA Astrophysics Data System (ADS)

We developed the primary components applicable to HPCF links for short reach (SR) and very short reach (VSR) data communication systems. We fabricated 4x4 HPCF fused taper splitter, HPCF pigtailed VCSEL and PIN photodiode for high speed short reach communications and characterized back to back transmission performance of the link composed of these components by measuring eye diagrams and jitters. Adapting the fusion-tapering technique for glass optical fiber, we successfully fabricated a 4x4 HPCF fused taper coupler. The HPCF with a core diameter of 200?m and an outer diameter of 230?m had step refractive index of 1.45 and 1.40 for the core and the clad. The optimized fusion length and tapering waist which make minimum insertion loss of about 7dB and uniform output power splitting ratio with less than 0.5dB are 13mm and 150µm, respectively. As a light source for VSR networks, we chose a vertical cavity surface emitting laser (VCSEL) and developed a package with a HPCF pigtail. After positioning VCSEL and HPCF that made a minimum coupling loss, we glued the HPCF inside ceramic ferrule housing. In HPCF-PIN PD packaging, we added a micro polymer lens tip onto the HPCF ends to match the mode field area to the sensitive area of GaAs or InGaAs PIN PD. Coupling between a PIN PD chip and the lensed HPCF was optimized with the radius of curvature of 156µm with a low coupling loss of 0.3dB, which is compatible to conventional MMF-PD packaging. For 1.25 Gbps data rate, the eyes adequate to eye mask in gigabit Ethernet were wide open after all HPCF transmission link and no significant power penalty was observed.

Kim, Jun Ki; Kim, Dong Uk; Kim, Tae Young; Park, Chang Soo; Oh, Kyunghwan

2006-09-01

5

High reliability optical interconnections for short range applications in high performance optical communication systems  

NASA Astrophysics Data System (ADS)

This paper has proposed a new progress of optical interconnections, taking into account the following items such as its ultimate device bandwidth, its available transmission bit rates based on soliton transmission technique, its ultimate transmission link bandwidth, and the product of the link bandwidth and its transmission length. Two items of special emphasis in the basic design of optical interconnection are polymethyl metha acrylate (PMMA) and barium fluoride (BaF2) waveguides, and the optical source cast as vertical cavity surface emitting laser diode (VCSELD), made of either AlGaAs at operating wavelength of 1.3 ?m or aluminum gallium indium phosphors (AlGaInP) at operating wavelength of 1.55 ?m; special emphasis is focused on both the above two items under different operating conditions including both thermal and electrical effects. The optical interconnect is built up on the bases of two VCSELD and one optical link where thermal effects of both diodes and links are included. The good performance of the optical interconnect is deeply and parametrically investigated under wide ranges of the affecting parameters. The high speed performance is processed through three different effects, namely the device 3-dB bandwidth, and the link dispersion characteristics.

Rashed, Ahmed Nabih Zaki

2013-06-01

6

Short Communication Keith A. Baggerly  

E-print Network

Short Communication Keith A. Baggerly Jeffrey S. Morris Jing Wang David Gold Lian-Chun Xiao Kevin R from serum samples For our analysis of the data from the First Annual Proteomics Data Mining Conference, not processed. The data set for the First Annual Proteomics Data Mining Conference consisted of both raw MALDI

Morris, Jeffrey S.

7

Short communication Corticosterone and stable  

E-print Network

behaviour prior to the breeding season can influence egg mass in Atlantic Puffins Fratercula arctica, the Atlantic Puffin Fratercula arctica. To do this, we measured d15 N values, which gauge the relative trophicShort communication Corticosterone and stable isotopes in feathers predict egg size in Atlantic

8

Short-range communication system  

NASA Technical Reports Server (NTRS)

A short-range communication system includes an antenna, a transmitter, and a receiver. The antenna is an electrical conductor formed as a planar coil with rings thereof being uniformly spaced. The transmitter is spaced apart from the plane of the coil by a gap. An amplitude-modulated and asynchronous signal indicative of a data stream of known peak amplitude is transmitted into the gap. The receiver detects the coil's resonance and decodes same to recover the data stream.

Alhorn, Dean C. (Inventor); Howard, David E. (Inventor); Smith, Dennis A. (Inventor)

2012-01-01

9

Short communication Fractional Mathieu equation  

E-print Network

Short communication Fractional Mathieu equation R.H. Rand a,b,*, S.M. Sah c , M.K. Suchorsky of Mathieu's equation, x00 þ ðd þ cos t?x ¼ 0; ð10? being an equation which is important in questions the familiar damped Mathieu equation [19]. We begin the paper with a brief introduction to the fractional

Rand, Richard H.

10

Wear 262 (2007) 220224 Short communication  

E-print Network

Wear 262 (2007) 220­224 Short communication Tribological behavior of PEEK components with compositionally graded PEEK/PTFE surfaces David L. Burris, W. Gregory Sawyer Department of Mechanical in revised form 6 March 2006; accepted 21 March 2006 Available online 26 May 2006 Abstract PEEK is a high

Sawyer, Wallace

11

High-speed 850 nm VCSELs with 28 GHz modulation bandwidth for short reach communication  

NASA Astrophysics Data System (ADS)

We present results from our new generation of high performance 850 nm oxide confined vertical cavity surface-emitting lasers (VCSELs). With devices optimized for high-speed operation under direct modulation, we achieve record high 3dB modulation bandwidths of 28 GHz for ~4 ?m oxide aperture diameter VCSELs, and 27 GHz for devices with a ~7 ?m oxide aperture diameter. Combined with a high-speed photoreceiver, the ~7 ?m VCSEL enables error-free transmission at data rates up to 47 Gbit/s at room temperature, and up to 40 Gbit/s at 85C.

Westbergh, Petter; Safaisini, Rashid; Haglund, Erik; Gustavsson, Johan S.; Larsson, Anders; Joel, Andrew

2013-03-01

12

47 CFR 90.371 - Dedicated short range communications service.  

Code of Federal Regulations, 2010 CFR

...false Dedicated short range communications service. 90.371 Section...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) ...for Dedicated Short-Range Communications Service (dsrcs) ...

2010-10-01

13

Short-range communication with ultraviolet LEDs  

Microsoft Academic Search

Non-line-of-sight (NLOS) ultraviolet (UV) communication appears to be a viable alternative to RF communication for many short-range applications. It exploits both atmospheric scattering and absorption to achieve modest data rates under non line-of-sight (ground-to-ground) and obstructed line-of-sight (foliage penetration) conditions. In this paper, we introduce NLOS optical communication and discuss the advantages of UV over radio (RF) for covert, short-range

Andrew M. Siegel; Gary A. Shaw; Joshua Model

2004-01-01

14

A secure short message communication protocol  

Microsoft Academic Search

According to the security requirement of the short message service (SMS) industry application, a secure short message communication\\u000a protocol is proposed. This is an application level protocol constructed on the standard SMS communication protocol using public\\u000a key authentication and key agreement without the need of wireless public key infrastructure (WPKI). Secure short message transmission\\u000a and dynamic key agreement between mobile

Chao-Wen Chang; Heng Pan; Hong-Yong Jia

2008-01-01

15

Fisheries Research 86 (2007) 285288 Short communication  

E-print Network

Fisheries Research 86 (2007) 285­288 Short communication A comparison of the effect of three common Three tagging methods ­ T-bar tags, streamer tags and visual implant elastomer (VIE) ­ were tested (95% survival after 60 d). T-bar tags did not significantly affect short-term survival either

Claverie, Thomas

16

Aquatic Botany 74 (2002) 181187 Short communication  

E-print Network

and Polypedates leucomystax tadpoles. After 7 days in co-culture, the growth yield of Azolla filiculoides for Azolla filiculoides in comparison to Azolla pinnata (Antoine et al., 1986). Chemical differences betweenAquatic Botany 74 (2002) 181­187 Short communication Feeding deterrence of Azolla in relation

Cohen, Michael F.

17

SHORT COMMUNICATION Determining Synthetic Failures in  

E-print Network

the general form D-Glu-Xxx-Xxx-CONH2 has been synthesized using a standard mix and split synthetic protocol approach and standard Fmoc chemistry protocols; the synthesis is expected to produce equimolar quantitiesSHORT COMMUNICATION Determining Synthetic Failures in Combinatorial Libraries by Hybrid Gas

Clemmer, David E.

18

Short Communication Spectral dimension of fluid membranes  

E-print Network

2395 Short Communication Spectral dimension of fluid membranes Shigeyuki Komura(*) and Artur self-avoiding vesicles are investi- gated by Monte Carlo methods. For both cases we obtained ds=2 simulations [2,3] that polymerized self-avoiding membranes are essentially flat and the corresponding in

Paris-Sud XI, Université de

19

SHORT COMMUNICATION Dietary consistency and the midline  

E-print Network

SHORT COMMUNICATION Dietary consistency and the midline sutures in growing pigs AK Burn SW Herring R Hubbard K Zink K Rafferty DE Lieberman Authors' affiliations: A.K. Burn, S.W. Herring, K. Rafferty, Harvard University, Boston, MA, USA Correspondence to: Amrit K. Burn 11066 5th Ave NE #207 Seattle, WA

Lieberman, Daniel E.

20

Vaccine 24 (2006) 38813888 Short communication  

E-print Network

Vaccine 24 (2006) 3881­3888 Short communication Quantifying influenza vaccine efficacy 2006 Abstract We introduce a new measure of antigenic distance between influenza A vaccine of the annual vaccine between 1971 and 2004, as do results of a theory of the immune response to influenza

Earl, David J.

21

VIROLOGY 214, 289293 (1995) SHORT COMMUNICATION  

E-print Network

VIROLOGY 214, 289­293 (1995) SHORT COMMUNICATION Dimerization of the Human Papillomavirus E7 to show that human papillomavirus E7 proteins can form oligomeric complexes in vivo. The carboxyl is thought to account for human papillomaviruses (HPVs), approximately 20 are many biological properties

Brent, Roger

22

Short Communication Intraperitoneal delivery of exogenous corticosterone  

E-print Network

Short Communication Intraperitoneal delivery of exogenous corticosterone via osmotic pump in captive White-throated Sparrows. Males received implants containing either a low (LD) or moderate dose (MD. Slight increases in post-implant CORT resulted in V males, but not in RU males. We observed

Holberton, Rebecca L.

23

Short Communication AVOIDANCE, WEIGHT LOSS, AND COCOON PRODUCTION ASSESSMENT FOR  

E-print Network

Short Communication AVOIDANCE, WEIGHT LOSS, AND COCOON PRODUCTION ASSESSMENT FOR EISENIA FETIDA) was hindered only at very high C60 concentrations (5% by weight), and C60 (up to 1%) was not avoided and did;30:2542­2545. # 2011 SETAC Keywords--Earthworm Avoidance test Reproduction Nanoparticle Ecotoxicity INTRODUCTION

Alvarez, Pedro J.

24

Short communication Fractal in fracture of bulk metallic glass  

E-print Network

Short communication Fractal in fracture of bulk metallic glass M.Q. Jiang a,b , J.X. Meng a , J. Bulk metallic glass B. Dynamic fracture C. Nanoscale periodic corrugation C. Fractal a b s t r a c t We tough bulk metallic glass, submitted to high-velocity plate impact and scanned by atomic force

Gao, Jianbo

25

Short Communication: High Prevalence of Vitamin D Deficiency in HIV-Infected and HIV-Uninfected Pregnant Women  

PubMed Central

Abstract Vitamin D deficiency is common in HIV-infected populations. In resource-limited settings, vitamin D deficiency has been shown to affect HIV disease progression and mortality in pregnant women, and also increases mother-to-child HIV transmission and mortality in their infants. This study sought to investigate vitamin D status in HIV-infected women compared to healthy controls in a high-income country setting and determine variables associated with vitamin D deficiency. We prospectively enrolled 40 women/infant pairs (16 HIV-infected women/HIV-exposed infant pairs and 24 uninfected/unexposed pairs). In serum cord blood, 25-hydroxyvitamin D [25(OH)D] concentrations were suboptimal (<30?ng/ml) in 100% of subjects from both groups. White race, non-Hispanic ethnicity was the only variable associated with higher serum 25(OH)D concentrations. This high prevalence of vitamin D deficiency, especially among HIV-infected women and their infants, deserves further investigation, as it may have a negative impact on maternal and infant health. PMID:23675655

Leong, Traci; Avery, Ann; Castillo, Marina Duran; Bonilla, Hector; Storer, Norma; Labbato, Danielle; Khaitan, Alka; Tangpricha, Vin; McComsey, Grace A.

2013-01-01

26

SHORT COMMUNICATION Echinococcus multilocularis in the red fox (Vulpes vulpes)  

E-print Network

SHORT COMMUNICATION Echinococcus multilocularis in the red fox (Vulpes vulpes) in Slovenia the parasitological washing out method, we examined the intestines of 428 red foxes (Vulpes vulpes) for the presence

Boyer, Edmond

27

SHORT COMMUNICATION Wild turkey (Meleagris gallopavo) detectability from helicopters  

E-print Network

SHORT COMMUNICATION Wild turkey (Meleagris gallopavo) detectability from helicopters species but its application for wild turkey (Meleagris gallopavo) populations has been limited. We populations (Thompson et al. 1998; Bibby et al. 2000). However, many wild turkey (Meleagris gallopavo) survey

Butler, Matthew J.

28

SHORT COMMUNICATION Multiplex Polymerase Chain Reaction Diagnostics of Bed Bug  

E-print Network

SHORT COMMUNICATION Multiplex Polymerase Chain Reaction Diagnostics of Bed Bug (Hemiptera. A molecular diagnostic technique applying multiplex polymerase chain reaction (PCR) was developed, molecular diagnostics, mitochondrial DNA, multiplex polymerase chain reaction Cimex lectularius L

Szalanski, Allen L.

29

SHORT COMMUNICATION Selection of primers for optimal taxonomic  

E-print Network

SHORT COMMUNICATION Selection of primers for optimal taxonomic classification of environmental 16S precision when classifying environmental sequence reads from a given primer. Applying this measure). Interest in sequence- based surveys of environmental microbes has exploded in recent years

30

Short communication Continuous plankton recorder underestimates zooplankton abundance  

E-print Network

Short communication Continuous plankton recorder underestimates zooplankton abundance Joachim W online 25 September 2012 Keywords: Mesozooplankton North Sea Continuous plankton recorder A comparison between monthly mean Continuous Plankton Recorder (CPR) data and zooplankton data caught during winter

Dippner, Joachim W.

31

Short communication A new technique to measure micromotion distribution around  

E-print Network

Short communication A new technique to measure micromotion distribution around a cementless femoral performed as in the operation room. Prior to implantation, 5 spherical (| 800 mm) tantalum (Ta) beads (stem

Guerraoui, Rachid

32

High Voltage AC Power Transmission Lines and Communications Receiver Sites.  

National Technical Information Service (NTIS)

A short discussion of the effects of the Electromagnetic Interference (EMI) radiated from High Voltage AC (HVAC) Power Transmission lines on HF Communications Receivers is followed by the description of a method for choosing communications receiver sites ...

F. R. Hill

1976-01-01

33

A Short History of Electrical Communication.  

ERIC Educational Resources Information Center

Electrical communication progressed rapidly after Samuel Morse demonstrated the telegraph in 1838. Western Union completed the first transcontinental telegraph line in 1861. Five years later the first transoceanic cable was laid. In 1875 A.G. Bell transmitted the first complete sentence heard over wire, and the first Bell telephone company was

Federal Communications Commission, Washington, DC.

34

SHORT COMMUNICATIONS ORNITOLOGIA NEOTROPICAL 23: 287290, 2012  

E-print Network

and Upland Goose flushed together for a short period of flight (Fig. 1B). The nest contained five Upland Society PARASITISM AND JOINT INCUBATION OF UPLAND GOOSE (CHLOEPHAGA PICTA) NEST BY YELLOW-BILLED PINTAIL the next bowl. On 1 November 2011, we observed a Yel- low-billed Pintail and Upland Goose (Chloe- phaga

McCracken, Kevin G.

35

Quaternary Geochronology 2 (2007) 155161 Short communication  

E-print Network

RESEARCH ARTICLES Geological Dates and Molecular Rates: Fish DNA Sheds Light on Time Dependency online). More recently, rates of DNA change have been estimated using precisely dated subfossil material? Previously, pedigree and ancient DNA studies--focusing on evolution in the short term--have yielded molecular

Long, Bernard

36

SHORT COMMUNICATIONS ORNITOLOGIA NEOTROPICAL 17: , 2006  

E-print Network

) at these elevations from Colombia to Peru (Ridgely & Greenfield 2001, Snow 2001). While a fair amount has been written of a 3.3-m high soil bank. The tunnel entrance was excavated in tighly #12;2 GREENEY ET AL. packed clay-like soil, 80 cm below the bottom of the topsoil layer. It was below a 60 cm overhang of roots and topsoil

Martin, Paul R.

37

Short Communication Substance abuse as a dynamical disease  

E-print Network

Short Communication Substance abuse as a dynamical disease: Evidence and clinical implications of substance abuse by fitting a nonlinear model to a time series of the amount of alcohol, which an adult male with a diagnosis of substance abuse consumed on a daily basis. The nonlinear model shows a statistically superior

Sprott, Julien Clinton

38

Agricultural and Forest Meteorology 118 (2003) 137141 Short communication  

E-print Network

understory of moist forests is light (Chazdon and Pearcy, 1991; Canham et al., 1994). In the forestsAgricultural and Forest Meteorology 118 (2003) 137­141 Short communication Landscape variations in understory PAR for a mixed deciduous forest in New England, USA Matthew M. Fladeland, Mark S. Ashton, Xuhui

Lee, Xuhui

39

Short communication Modelling respiration of vegetation: evidence for a  

E-print Network

Short communication Modelling respiration of vegetation: evidence for a general temperature, boreal tree species, dark respiration, elevated carbon dioxide, Q10, temperature response function a broad range of tempera- tures. In plants, dark respiration (see reviews by James 1953; Forward 1960

Minnesota, University of

40

SHORT COMMUNICATION Morphological and genetic variation in the endangered Sulawesi  

E-print Network

SHORT COMMUNICATION Morphological and genetic variation in the endangered Sulawesi tortoise for the food and traditional medicinal trades (van Dijk et al. 2000). The Sulawesi tortoise, Indotestudo forstenii, is endemic to Sulawesi and the neighboring island of Halmahera. It is considered to be Endangered

Grether, Gregory

41

Short communication In vitro acetylcholinesterase secretion by male  

E-print Network

Short communication In vitro acetylcholinesterase secretion by male or female Heligmosomoides-Nouzilly, 37380 Monnaie, France (received 1-2-1988, accepted 16-7-1988) Summary ― Acetylcholinesterase (ACh, and three times higher for male worms than for female worms. acetylcholinesterase - Heligmosomoides

Paris-Sud XI, Université de

42

Short communication Birth of piglets after OPS vitrification and transfer  

E-print Network

Short communication Birth of piglets after OPS vitrification and transfer of compacted morula stage as blastocysts, to be able to cryopreserve all the day 5­6 embryos. Previously, the birth of piglets has been transfer, which is not in accordance with general quality control practices for embryo transfer [5]. Only

Paris-Sud XI, Université de

43

Volume 3 Issue 9 1000181 Open AccessShort Communication  

E-print Network

.4172/2155-6113.1000181AIDS & Clinical Research Knowledge, Attitudes, Beliefs and Practices on HIV/AIDS among Boatmen and Practices on HIV/AIDS among Boatmen on the Maroni River: A Neglected Bridging Group? J AIDS Clinic Res 3Volume 3 · Issue 9 · 1000181 Open AccessShort Communication J AIDS Clinic Res ISSN:2155-6113 JAR

Paris-Sud XI, Université de

44

Short communication Infrageneric phylogenies: a comparison of chloroplast-expressed  

E-print Network

Short communication Infrageneric phylogenies: a comparison of chloroplast-expressed glutamine decade, a range of chloroplast and mito- chondrial markers have been developed for phylogenetic purposes). Specifically, non-coding regions of the chloroplast ge- nome have displayed an adequate level of variation

45

Short communication A digital model of coupled oscillators  

E-print Network

Short communication A digital model of coupled oscillators R.E. Ruelas a , R.H. Rand b,c,* a Center Accepted 9 July 2010 Available online 13 July 2010 Keywords: Coupled oscillators Synchronization Digital oscillator a b s t r a c t A new model of coupled oscillators is proposed and investigated. All phase

Rand, Richard H.

46

Short communication Observations of eruptive activity at Santiaguito volcano, Guatemala  

E-print Network

Short communication Observations of eruptive activity at Santiaguito volcano, Guatemala Gregg J volcano, Guatemala, from the vantage point of its parent, Santa Mari´a. We have taken 12 h of digital and Geothermal Research 136 (2004) 297­302 #12;even for a single event, much less a series or cycle of eruptions

Rose, William I.

47

Short communication Buried relic seawall mitigates Hurricane Sandy's impacts  

E-print Network

Short communication Buried relic seawall mitigates Hurricane Sandy's impacts Jennifer L. Irish a Accepted 6 June 2013 Available online xxxx Keywords: Hurricanes Storm surge Waves Storm damage Seawalls of Hurricane Sandy revealed clear differences in patterns of the impact between two neighboring boroughs along

Lynett, Patrick

48

SHORT COMMUNICATION Differing effects of exogenous or endogenous  

E-print Network

SHORT COMMUNICATION Differing effects of exogenous or endogenous cathelicidin on macrophage toll immunomodulatory effects during the innate immune response. One such function of human cathelicidin is direct acid and flagellin. In this context, CRAMP is capable of aborting MyD88 synthesis and MyD88/IRAK

Nizet, Victor

49

Short Communication Spontaneous neuronal discharge patterns in developing  

E-print Network

Short Communication Spontaneous neuronal discharge patterns in developing organotypic mega, extending from the prefrontal to the occipital area, were cultured separately or in pairs, oriented was consistently less active than the occipital area but the two were qualitatively similar with respect

van Pelt, Jaap

50

Short Communication Supersymmetry in hydrodynamics: vorticity as a ghost charge  

E-print Network

2501 Short Communication Supersymmetry in hydrodynamics: vorticity as a ghost charge M.V Altaisky theorem is shown to be equivalent to the conservation of ghost charge - one of the generators related field A (x, t) and two Grassmann fields c and c, called ghosts. This "action" has some graded (i

Paris-Sud XI, Université de

51

Journal of Biomechanics 39 (2006) 968972 Short communication  

E-print Network

to result from continued repetitive (cyclic fatigue) loading, rather than a single traumatic loading eventJournal of Biomechanics 39 (2006) 968­972 Short communication Propagation of surface fatigue cracks of California, Berkeley, CA 94720, USA Accepted 25 January 2005 Abstract An understanding of how fatigue cracks

Ritchie, Robert O.

52

2001. The Journal of Arachnology 29:119124 SHORT COMMUNICATION  

E-print Network

119 2001. The Journal of Arachnology 29:119­124 SHORT COMMUNICATION SPIDERS FEEDING ON EARTHWORMS) was observed, filmed and photographed while feeding on an earthworm. An extensive search in the literature revealed that several arachnologists had noted spiders feeding on earthworms, altogether in 11 different

Richner, Heinz

53

SHORT COMMUNICATION Fusarium mangiferae associated with mango malformation  

E-print Network

SHORT COMMUNICATION Fusarium mangiferae associated with mango malformation in the Sultanate of Oman in the beginning of 2005 in plantations at Sohar in the Sultanate of Oman. The affected inflorescences were factor 1 . -tubulin Mango (Mangifera indica) is an important perennial crop in the Sultanate of Oman

54

Short communication Partnering with local communities to identify conservation priorities  

E-print Network

Short communication Partnering with local communities to identify conservation priorities decisions. Here, we show the scientific and conservation benefits of recruiting and training local community of an endangered population, and the threats it faces, may vary greatly over its range. This is especially true

Rubenstein, Daniel I.

55

Short communication Effectiveness of an electro-tactile vestibular substitution  

E-print Network

Short communication Effectiveness of an electro-tactile vestibular substitution system in improving upright postural control in unilateral vestibular-defective patients Nicolas Vuillerme a,*, Nicolas We investigated the effects of an electro-tactile vestibular substitution system (EVSS) on upright

Payan, Yohan

56

SHORT COMMUNICATION Occurrence of verocytotoxin-producing Escherichia coli  

E-print Network

SHORT COMMUNICATION Occurrence of verocytotoxin-producing Escherichia coli in the faeces of free Verocytotoxin-producing Escherichia coli (VTEC) is an important group of emerging food-borne pathogens of programmes for controlling VTEC at the farm level. Keywords Verocytotoxin-producing Escherichia coli (VTEC

Paris-Sud XI, Université de

57

SHORT COMMUNICATION A fast microfluidic mixer based on acoustically driven  

E-print Network

SHORT COMMUNICATION A fast microfluidic mixer based on acoustically driven sidewall / Accepted: 30 March 2009 / Published online: 25 April 2009 ? Springer-Verlag 2009 Abstract Due to the low 2004; Lam et al. 2005; Chang and Yang 2007; Lee et al. 2007). To date, a number of micromixing methods

58

Short communication Compositional control of continuously graded anode functional layer  

E-print Network

Short communication Compositional control of continuously graded anode functional layer J. Mc with linear-compositionally graded anode functional layers (CGAFL) using a computer-controlled compound electrodes [12]. While experimental results on functionally graded SOFC structures are needed in order

Mukhopadhyay, Sharmila M.

59

SHORT COMMUNICATION Mechanisms of constraints: the contributions of selection and  

E-print Network

, and Cedrus (Butts & Buchholz, 1940; Haskell, 1954; Correspondence: Jeffrey K. Conner, Kellogg Biological to the maintenance of cotyledon number in wild radish J. K. CONNER* & A. A. AGRAWAL *W. K. Kellogg BiologicalSHORT COMMUNICATION Mechanisms of constraints: the contributions of selection and genetic variance

Agrawal, Anurag

60

SHORT COMMUNICATION Reproductive performance of the wild collared peccary  

E-print Network

SHORT COMMUNICATION Reproductive performance of the wild collared peccary (Tayassu tajacu) female Abstract Based on the gross anatomic examination of 218 adult female reproductive tracts, we characterised the reproductive biology of the wild collared peccary in the Northeastern Peruvian Amazon. Collared peccary

Paris-Sud XI, Université de

61

SHORT COMMUNICATION Bernard Fried Pieter T. J. Johnson  

E-print Network

SHORT COMMUNICATION Bernard Fried ? Pieter T. J. Johnson In vitro excystment of the metacercariae have aroused considerable interest. (e.g., Johnson et al. 1999; Blaustein and Johnson 2003; Johnson in missing gaps on the biology of R. ondatrae (Johnson et al. 2004). One area of research interest

Johnson, Pieter

62

Short Communication Phylogenetic relationships of leopard frogs (Rana pipiens complex)  

E-print Network

Short Communication Phylogenetic relationships of leopard frogs (Rana pipiens complex) from June 2008 Available online xxxx Keywords: Control region Cryptic species Mexican leopard frogs the control region and 12S rRNA in leopard frogs from the Sierra El Aguaje of southern Sonora, Mexico

Markow, Therese

63

Short Communication Extraversion predicts individual differences in women's face preferences  

E-print Network

& Penton-Voak, 2002; Little, Burt, Penton-Voak, & Perrett, 2001). Indeed, women's self-rated attrac (Little et al., 2001) and voices (Vukovic et al., 2008). Furthermore, women with attractive faces and bodyShort Communication Extraversion predicts individual differences in women's face preferences Lisa L

Little, Tony

64

SHORT COMMUNICATION Adaptive eukaryote-to-eukaryote lateral gene transfer  

E-print Network

: endosymbiotic gene transfer (EGT) and lateral or horizontal gene transfer (LGT or HGT). The transfer of genesSHORT COMMUNICATION Adaptive eukaryote-to-eukaryote lateral gene transfer: stress-related genes, gene duplication and recombination, the transfer of genetic material between unrelated species is now

Nedelcu, Aurora M.

65

SHORT COMMUNICATION Do inexperienced bumblebee foragers use scent marks  

E-print Network

SHORT COMMUNICATION Do inexperienced bumblebee foragers use scent marks as social information / Published online: 4 June 2011 ? Springer-Verlag 2011 Abstract Bumblebees (Bombus spp.) foraging in the field learning shapes the development of this process, in both bumblebees and other bee species. This raises

Chittka, Lars

66

SHORT COMMUNICATION Foraging scent marks of bumblebees: footprint cues rather  

E-print Network

SHORT COMMUNICATION Foraging scent marks of bumblebees: footprint cues rather than pheromone bumblebees refuse to land on and probe flowers that have been recently visited (and depleted) by themselves with specific scent marks). Bumblebees rejected both active and passive feeders more frequently than unvisited

Eltz, Thomas

67

Short Communication Potential Remobilization of Belowground Permafrost Carbon under Future  

E-print Network

Short Communication Potential Remobilization of Belowground Permafrost Carbon under Future Global on permafrost carbon has dramatically increased in the past few years. A new estimate of 1672 Pg C of belowground organic carbon in the northern circumpolar permafrost region more than doubles the previous value

Wagner, Diane

68

SHORT COMMUNICATION Postural destabilization induced by trunk extensor muscles fatigue  

E-print Network

SHORT COMMUNICATION Postural destabilization induced by trunk extensor muscles fatigue) impaired with muscle fatigue localized at the lower back, and (2) improved through the use of plantar) no fatigue/no biofeedback, (2) no fatigue/ biofeedback, (3) fatigue/no biofeedback and (4) fatigue

Payan, Yohan

69

SHORT COMMUNICATION Wild turkey (Meleagris gallopavo) detectability from helicopters  

E-print Network

SHORT COMMUNICATION Wild turkey (Meleagris gallopavo) detectability from helicopters for wild turkey (Meleagris gallopavo) populations has been limited. We surveyed Rio Grande wild turkey (M et al. 1998; Bibby et al. 2000). However, many wild turkey (Meleagris gallopavo) survey efforts have

Wallace, Mark C.

70

Short communication Origin of arrhythmias in a heart model  

E-print Network

Short communication Origin of arrhythmias in a heart model Hiba Sheheitli, Richard Rand * Dept oscillators a b s t r a c t An investigation of the nonlinear dynamics of a heart model is presented. The model com- partmentalizes the heart into one part that beats autonomously (the x oscillator), repre

Rand, Richard H.

71

SHORT COMMUNICATION Enhanced gene delivery to the neonatal retina through  

E-print Network

in the retinoid isomerase retinal pigment epithelium (RPE)65.1­3 These clinical trials clearly demonstrateSHORT COMMUNICATION Enhanced gene delivery to the neonatal retina through systemic administration Delivery of therapeutic genes to a large region of the retina with minimal damage from intraocular surgery

Schaffer, David V.

72

Short Communication Lens Defects and Age-Related Fiber Cell  

E-print Network

of premature aging, virtually all individuals develop Alzheimer's disease (AD) in their fifth decade1Short Communication Lens Defects and Age-Related Fiber Cell Degeneration in a Mouse Model of Increased A PP Gene Dosage in Down Syndrome Peter H. Frederikse and Xiao-Ou Ren From the Department

Frederikse, Peter

73

Short communication Influence of molybdenum and sulfur on copper  

E-print Network

Short communication Influence of molybdenum and sulfur on copper metabolism in sheep: comparison of elemental sulfur and sulfate M. Lamand INRA, Laboratoire des Maladies Nutritionnelles, CRZV Theix, 63122 levels of molybdenum, and sulfur contents are often in excess in ruminant feeds. The minimum level

Paris-Sud XI, Université de

74

SHORT COMMUNICATION An audio/video surveillance system for wildlife  

E-print Network

widely used to document the presence and behaviour of animals at nests, trap sites and wildlife passagesSHORT COMMUNICATION An audio/video surveillance system for wildlife Roman Gula & Jörn Theuerkauf frequently visited by wildlife. Keywords Methods . Video surveillance . Nest monitoring . Digital video

Paris-Sud XI, Université de

75

SHORT COMMUNICATION Quantifying the effects of individual and environmental  

E-print Network

SHORT COMMUNICATION Quantifying the effects of individual and environmental variability in fish ABSTRACT The effect of environmental variability on fish recruitment is analysed using simple linear growth of recruitment. It is also argued that environmental variance should lead to differences in growth rates observed

James, Alex

76

Short Communication Catalytic coal gasification: use of calcium versus potassium*  

E-print Network

Short Communication Catalytic coal gasification: use of calcium versus potassium* Ljubisa R on the gasification in air and 3.1 kPa steam of North Dakota lignitic chars prepared under slow and rapid pyrolysis of calcium is related to its sintering via crystallite growth. (Keywords: coal; gasification; catalysis

77

Short communication Nasal carriage of Staphylococcus aureus in dairy sheep  

E-print Network

1 Short communication Nasal carriage of Staphylococcus aureus in dairy sheep E. Vautor*, G. Abadie in the flock was 29% of the nares of the ewes contaminated by Staphylococcus aureus. The genotyping results,version1-16Nov2009 #12;3 Key-words: Staphylococcus aureus; Pulsed-Field Gel Electrophoresis (PFGE); Ewe

Paris-Sud XI, Université de

78

Journal of Biomechanics 38 (2005) 19381942 Short communication  

E-print Network

Journal of Biomechanics 38 (2005) 1938­1942 Short communication Simulated parallel annealing within), knee implant (Mahfouz et al., 2003) and medical image registration (Matsopoulos et al., 2003; Loeckx et al., 2003; Rueckert et al., 1997), kinematic analysis of joint implants (Sarojak et al., 1999

79

Short Communication Saline catholytes as alternatives to phosphate buffers in microbial  

E-print Network

Short Communication Saline catholytes as alternatives to phosphate buffers in microbial fuel cells of phosphate buffer in two-chamber MFCs. " Maximum power of 491 mW/m2 was only 17% less than from MFCs with 50 2013 Keywords: Microbial fuel cell Buffer Sodium chloride Ion exchange membrane a b s t r a c t Highly

80

1001Ellis et al.--Acidic hot spring microorganisms Short communication  

E-print Network

of acidic hot springs of Waiotapu, North Island, New Zealand DEAN G. ELLIS RICHARD L. WEISS BIZZOCO YUKARI1001Ellis et al.--Acidic hot spring microorganisms Short communication Microscopic examination are reported for the first time in the low pH high temperature springs of Waiotapu, North Island, New Zealand

Kelley, Scott

81

SHORT COMMUNICATION Development of diet-induced fatty liver disease in  

E-print Network

SHORT COMMUNICATION Development of diet-induced fatty liver disease in the aging mouse, USA The age-induced decline in the body's ability to fight disease is exacerbated by obesity and metabolic disease. Using a mouse model of diet-induced obesity, the combined challenge of a high-fat diet

82

SHORT COMMUNICATION Stress in the wild: Chronic predator pressure and acute restraint affect  

E-print Network

SHORT COMMUNICATION Stress in the wild: Chronic predator pressure and acute restraint affect plasma circulating steroid levels at baseline and after acute restraint in the breeding and nonbreeding seasons levels than males in high predator pressure (HPP) environments. Also, acute restraint decreased DHEA

Zanette, Liana

83

SHORT COMMUNICATION Impact of growing conditions on the competitive ability of  

E-print Network

SHORT COMMUNICATION Impact of growing conditions on the competitive ability of Camelina sativa (L on the competitive ability of Camelina sativa (L.) Crantz (Camelina). Can. J. Plant Sci. 93: 243Á247. It has been claimed that Camelina sativa, a recently introduced crop in the northern Great Plains, is a highly

Maxwell, Bruce D.

84

Short Communication It's a family matter: Molecular phylogenetics of Atheriniformes and the polyphyly  

E-print Network

Short Communication It's a family matter: Molecular phylogenetics of Atheriniformes Atheriniforms species have an elon- gate missile shaped body that is well adapted to the calm water surface water habitats inhabited by most members of this group, notocheirids have a deep and highly laterally

Piller, Kyle R.

85

Short Communication Herbarium specimens as a source of DNA for AFLP fingerprinting  

E-print Network

Short Communication Herbarium specimens as a source of DNA for AFLP fingerprinting of Phragmites are a valuable source of genetic information. Even though the DNA obtained from the specimens is often highly fragmented and present in small quantities, it has been successfully used particularly for DNA sequencing

Schierup, Mikkel Heide

86

Short communications Experiments in Fluids 27 (1999) 102--106 Springer-Verlag 1999 Visualization of high-speed gas jets and their airblast sprays  

E-print Network

of high-speed gas jets and their airblast sprays of cross-injected liquid K. D. Kihm, T. K. Kim, S. Y. Son. For the visualization of high-speed gas jets (with no liquid injected), Nd:YAG pulsed laser sheets imaged the clustered a jet with a higher Mach number than the former. It is conjectured that the injected liquid interactions

Kihm, IconKenneth David

87

Short communication: Staphylococcus aureus isolated from colostrum of dairy heifers represent a closely related group exhibiting highly homogeneous genomic and antimicrobial resistance features.  

PubMed

In heifers, intramammary infections caused by Staphylococcus aureus affect milk production and udder health in the first and subsequent lactations, and can lead to premature culling. Not much is known about Staph. aureus isolated from heifers and it is also unclear whether or not these strains are readily transmitted between heifers and lactating herd mates. In this study, we compared phenotypic characteristics, spa types, and DNA microarray virulence and resistance gene profiles of Staph. aureus isolates obtained from colostrum samples of dairy heifers with isolates obtained from lactating cows. Our objective was to (1) characterize Staph. aureus strains associated with mastitis in heifers and (2) determine relatedness of Staph. aureus strains from heifers and lactating cows to provide data on transmission. We analyzed colostrum samples of 501 heifers and milk samples of 68 lactating cows within the same herd, isolating 48 and 9 Staph. aureus isolates, respectively. Staphylococcus aureus strains from heifers, lactating herd mates, and an unrelated collection of 78 strains from bovine mastitis milk of mature cows were compared. With 1 exception each, characterization of all strains from heifers and lactating cows in the same herd yielded highly similar phenotypic and genotypic results. The strains were Staphaurex latex agglutination test negative (Oxoid AG, Basel, Switzerland) and belonged to agr type II, CC705, and spa types tbl 2645 and t12926. They were susceptible to all antimicrobial agents tested. In contrast, the strains from mature cows in other herds were spread across different clonal complexes, spa types, and SplitsTree clusters (http://www.splitstree.org/), thus displaying a far higher degree of heterogeneity. We conclude that strains isolated from colostrum of heifers and mastitis milk of lactating cows in the same herd feature highly similar phenotypic and genomic characteristics, suggesting persistence of the organism during the first and potentially subsequent lactations or transmission between heifers and mature herd mates. PMID:24881795

Stalder, Ueli; Stephan, Roger; Corti, Sabrina; Bludau, Maren; Maeschli, Ariane; Klocke, Peter; Johler, Sophia

2014-08-01

88

Short communication: Effects of molasses products on productivity and milk fatty acid profile of cows fed diets high in dried distillers grains with solubles.  

PubMed

Previous research has shown that replacing up to 5% [of dietary dry matter (DM)] corn with cane molasses can partially alleviate milk fat depression when cows are fed high-concentrate, low-fiber rations containing dried distillers grains with solubles. The primary objective of this study was to determine whether dietary molasses alters milk fatty acid (FA) profile or improves solids-corrected milk yield in the context of a more typical lactation diet. A secondary objective was to assess production responses to increasing rumen-degradable protein supply when molasses was fed. Twelve primiparous and 28 multiparous Holstein cows (196 39 d in milk) were blocked by parity and assigned to 4 pens. Pens were randomly allocated to treatment sequence in a 4 4 Latin square design, balanced for carryover effects. Treatment periods were 21 d, with 17 d for diet adaptation and 4 d for sample and data collection. Treatments were a control diet, providing 20% dried distillers grains with solubles (DM basis), 35% neutral detergent fiber, 30% starch, and 5% ether extract; a diet with 4.4% cane molasses replacing a portion of the corn grain; a diet with 2.9% molasses supplement containing 32% crude protein on a DM basis; and a diet with 5.8% (DM basis) molasses supplement. Animal-level data were analyzed using mixed models, including the fixed effect of treatment and the random effects of period, pen, period pen interaction, and cow within pen to recognize pen as the experimental unit. Diets did not alter DM intake, milk production, milk component concentration or yield, feed efficiency (DM intake/milk yield), body weight change, or milk somatic cell count. Milk stearic acid content was increased by the diet containing 5.8% molasses supplement compared with the control diet and the diet containing 2.9% molasses supplement, but the magnitude of the effect was small (12.27, 11.75, and 11.69 0.29 g/100g of FA). Production data revealed a dramatic effect of period on milk fat content and yield. Milk fat content decreased during the course of the experiment (least squares means = 3.16, 2.81, 2.93, and 2.64 0.09% for periods 1 to 4, respectively), as did milk fat yield (1.20, 1.03, 0.98, and 0.79 0.05 kg/d). Exchanging molasses-based products for corn at 2.9 to 5.8% of dietary DM did not influence productivity and had minute effects on milk FA profile. The limited responses in this study may have been influenced by dietary unsaturated FA content or the advancing stage of lactation of cows in the study. PMID:24746128

Siverson, A; Vargas-Rodriguez, C F; Bradford, B J

2014-06-01

89

SHORT COMMUNICATION AZATHIOPRINE-INDUCED FATAL MACROCYTIC ANEMIA IN RABBITS  

E-print Network

Azathioprine (AZA) is used clinically sometimes at high doses for short-term therapy to treat acute rejection of kidney allograft or to desensitize hypersensitive patients to it. The delayed consequences of this approach had not been well investigated. Therefore, in this study we have investigated the delayed consequences of high-dose short-term AZA administration in rabbits. Our results showed that oral administration of AZA (10 mg/kg/day) to rabbits for two weeks induced reversible thrombocytosis and delayed fatal macrocytic anemia. Moreover, neither the hemoglobin level nor the white blood cell count was affected by AZA. The solvent of AZA had no effect on blood cell counts and hemoglobin levels. We can conclude that although high-dose AZA therapy may not induce immediate and significant changes in blood picture, delayed fatal macrocytosis may occur.

Pol J. Pharmacol; Saafan Al-safi; Bassam Tashtoush; Khalid Abdul-razzak; B. Tashtoush; K. Abdul-razzak; Pol J. Pharmacol

90

Reliability of traffic management applications based on digital short-range communications  

Microsoft Academic Search

In this paper, the performance of short-range vehicle-roadside communication systems, which support RTTT (Road Traffic & Transport Telematics) services, is analysed. After introducing general communication requirements of RTTT applications in a road traffic environment, a short overview about the current status of the Dedicated Short-Range Communications DSRC prENV draft standards developed within CEN TC 278\\/ISO TC 204 will be given.

Christian Wietfeld; B. Walke

1996-01-01

91

Design and analysis of highway safety communication protocol in 5.9 GHz dedicated short range communication spectrum  

Microsoft Academic Search

We study the wireless communication among highway vehicles in the newly-assigned 5.9 GHz dedicated short range communication (DSRC) spectrum. A vehicle-vehicle location-based broadcast (LBB) communication protocol is designed to meet highway safety applications' communication requirements. The analytical expressions of the performance of the protocol in terms of probability of transmission failure and channel occupancy are derived with commonly satisfied assumptions.

Qing Xu; R. Segupta; Daniel Jiang; D. Chrysler

2003-01-01

92

ISS Update: High Rate Communications System  

NASA Video Gallery

ISS Update Commentator Pat Ryan interviews Diego Serna, Communications and Tracking Officer, about the High Rate Communications System. Questions? Ask us on Twitter @NASA_Johnson and include the ha...

93

HIGH PERFORMANCE INTEGRATED NETWORK COMMUNICATIONS ARCHITECTURE -(INCA)  

E-print Network

HIGH PERFORMANCE INTEGRATED NETWORK COMMUNICATIONS ARCHITECTURE - (INCA) Klaus Schug1 , Anura communications architecture (INCA) is presented that is interoperable with all existing programs, computers and networks, and scales with network and CPU speeds. The INCA architecture minimizes internal system

Jayasumana, Anura P.

94

Short Abstract Alternative communication specifies a set of techniques, resources and tools in order to help  

E-print Network

of aphasia). The effectiveness of a communication system is measured by the minimization of the numberShort Abstract Alternative communication specifies a set of techniques, resources and tools in order to help handicapped people in order to produce speech or texts to communicate. This concerns

Paris-Sud XI, Université de

95

Design and Analysis of Highway Safety Communication Protocol in 5.9 GHz Dedicated Short Range Communication Spectrum  

E-print Network

Design and Analysis of Highway Safety Communication Protocol in 5.9 GHz Dedicated Short Range Communication Spectrum Qing Xu* Raja Sengupta * Department of Mechanical Engineering Department of Civil and Environmental Engineering University of California Berkeley, CA 90720­1740 Email: * qingxu

Sengupta, Raja

96

SHORT COMMUNICATION Blends of (R)-3-hydroxyhexan-2-one and alkan-2-ones  

E-print Network

SHORT COMMUNICATION Blends of (R)-3-hydroxyhexan-2-one and alkan-2-ones identified as potential Cerambycinae) pro- duce the common cerambycine pheromone component (R)-3-hydroxyhexan-2-one as well as an alkan

Hanks, Lawrence M.

97

SHORT COMMUNICATION Male tawny dragons use throat patterns to recognize rivals  

E-print Network

SHORT COMMUNICATION Male tawny dragons use throat patterns to recognize rivals Louise Osborne that facilitate such recognition in visual systems. Here, we show that in tawny dragons (Ctenophorus decresii

Keogh, Scott

98

Short communication How dormant is Mycobacterium tuberculosis during latency? A study  

E-print Network

Short communication How dormant is Mycobacterium tuberculosis during latency? A study integrating. Boulevard, DK-5000 Odense C, Denmark 1. Introduction Tuberculosis (TB) remains a leading infectious cause infected with Mycobacterium tuberculosis, people with latent tuberculosis infection (LTBI) represent

Rosenberg, Noah

99

Short communication Metatranscriptome analysis of lactic acid bacteria during kimchi fermentation with  

E-print Network

Kimchi is a fermented vegetable product made of various vegetables such as Chinese cabbage, radishShort communication Metatranscriptome analysis of lactic acid bacteria during kimchi fermentation microbial diversity and biological activity during the fermentation of kimchi, a traditional Korean

Bae, Jin-Woo

100

Short Communication to Arthropod Structure and Development Homology of the wing base sclerites in Ephemeroptera (Insecta  

E-print Network

- 1 / 8 - ASD-291 Short Communication to Arthropod Structure and Development Homology of the wing & Hörnschemeyer in a recent issue of Arthropod Structure and Development. The first free sclerite (s1

Yoshizawa, Kazunori

101

Short Communication Molecular systematics of the genus Holothuria in the Mediterranean  

E-print Network

Short Communication Molecular systematics of the genus Holothuria in the Mediterranean and Northeastern Atlantic and a molecular clock for the diversification of the Holothuriidae (Echinodermata investigates the systematics of the genus Holothuria in the Mediterranean Sea and Northeast- ern Atlantic

Teixeira, Sara

102

SHORT COMMUNICATION Somatic energy of sockeye salmon Oncorhynchus nerka at the  

E-print Network

SHORT COMMUNICATION Somatic energy of sockeye salmon Oncorhynchus nerka at the onset of upriver Stuart) of adult Fraser River (British Columbia, Canada) sockeye salmon (Oncorhynchus nerka), collected. Key words: body energy, climate change, energetics, ocean climate, Oncorhynchus, Pacific salmon

Farrell, Anthony P.

103

Short Communication The nitric oxide synthase inhibitor l-NAME suppresses androgen-induced  

E-print Network

Short Communication The nitric oxide synthase inhibitor l-NAME suppresses androgen-induced male anesthesia and each implanted with a Silastic tube (Helix Medical, 10 mm long, internal diameter 1.47 mm

Crews, David

104

47 CFR 90.371 - Dedicated short range communications service.  

Code of Federal Regulations, 2011 CFR

...short distances between roadside and mobile units, between mobile units, and between portable and mobile units to perform operations related...CA 340914N 1190524W Naval Air Development Center, PA 401200N 0750500W...

2011-10-01

105

Secure Email Communication: A Short Guide for Patients WHEN TO USE EMAIL  

E-print Network

Unencrypted email provides as much privacy as a postcard. Do not send any information to your health careSecure Email Communication: A Short Guide for Patients WHEN TO USE EMAIL Many UConn Health Center There are a number of risks that you should consider: providers welcome secure email communication

Oliver, Douglas L.

106

A high temperature superconductivity communications flight experiment  

NASA Technical Reports Server (NTRS)

The proposed high temperature superconductivity (HTSC) millimeter-wave communications flight experiment from the payload bay of the Space Shuttle Orbiter to the Advanced Communications Technology Satellite (ACTS) in geosynchronous orbit is described. The experiment will use a Ka-band HTSC phased array antenna and front-end electronics to receive a downlink communications signal from the ACTS. The discussion covers the system configuration, a description of the ground equipment, the spacecraft receiver, link performance, thermal loading, and the superconducting antenna array.

Ngo, P.; Krishen, K.; Arndt, D.; Raffoul, G.; Karasack, V.; Bhasin, K.; Leonard, R.

1992-01-01

107

Short-Range Ultra-Broadband Terahertz Communications  

E-print Network

-mail: j.schoebel@tu-bs~de 4ECE Department, MS 366, Rice University 6100 Main Street, TX 77005 Houston USATel: +1(713) 348-5452; Fax: +1(713) 345-5686; E-mail. daniel@rice.edu 5Terahertz Communications Lab paths. Their performance is investigated with ray-tracing simulations of a terahertz propagationchannel

Mittleman, Daniel

108

Short communication Phylogeny of Calvin cycle enzymes supports Plantae monophyly  

E-print Network

enzymes involved in glycolysis and gluceoneogenesis that catalyze reactions similar to those in the CCShort communication Phylogeny of Calvin cycle enzymes supports Plantae monophyly Adrian Reyes), takes place in the plastid stroma. The eukaryotic CC involves 11 different enzymes (Table 1

Bhattacharya, Debashish

109

Short communication Powering microbial electrolysis cells by capacitor circuits charged  

E-print Network

and sustainable is to remove the need for electrical grid energy. Large scale realization of a green MECShort communication Powering microbial electrolysis cells by capacitor circuits charged using and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA b Department

110

SHORT COMMUNICATIONS 691 The Condor 106:691695  

E-print Network

(Calypte anna) on nonbreeding territories chased a smaller pro- portion of intruders for shorter durations. For example, following short-term experimental reductions in their food supplies, male Anna's Hummingbirds, but not the dura- tion, of chases by territorial male Anna's Humming- birds increased with increasing sucrose

Temeles, Ethan J.

111

Systems and methods for short range RF communication  

NASA Technical Reports Server (NTRS)

A method transmitting a message over at least one of a plurality of channels of a communications network is provided. The method comprises the steps of detecting a presence of jamming pulses in the at least one of the plurality of channels. The characteristics of the jamming pulses in the at least one of the plurality of channels is determined wherein the determined characteristics define at least interstices between the jamming pulses. The message is transmitted over the at least one of the plurality of channels wherein the message is transmitted within the interstices of the jamming pulse determined from the step of determining characteristics of the jamming pulses.

Ross, John Anderson Fergus (Inventor); Tomlinson, Harold Woodruff (Inventor); Sexton, Daniel White (Inventor); Hershey, John Erik (Inventor); DeCristofaro, Richard Anthony (Inventor)

2012-01-01

112

Spacecraft design project: High latitude communications satellite  

NASA Technical Reports Server (NTRS)

The spacecraft design project was part of AE-4871, Advanced Spacecraft Design. The project was intended to provide experience in the design of all major components of a satellite. Each member of the class was given primary responsibility for a subsystem or design support function. Support was requested from the Naval Research Laboratory to augment the Naval Postgraduate School faculty. Analysis and design of each subsystem was done to the extent possible within the constraints of an eleven week quarter and the design facilities (hardware and software) available. The project team chose to evaluate the design of a high latitude communications satellite as representative of the design issues and tradeoffs necessary for a wide range of satellites. The High-Latitude Communications Satellite (HILACS) will provide a continuous UHF communications link between stations located north of the region covered by geosynchronous communications satellites, i.e., the area above approximately 60 N latitude. HILACS will also provide a communications link to stations below 60 N via a relay Net Control Station (NCS), which is located with access to both the HILACS and geosynchronous communications satellites. The communications payload will operate only for that portion of the orbit necessary to provide specified coverage.

Josefson, Carl; Myers, Jack; Cloutier, Mike; Paluszek, Steve; Michael, Gerry; Hunter, Dan; Sakoda, Dan; Walters, Wes; Johnson, Dennis; Bauer, Terry

1989-01-01

113

Acoustic communication in two freshwater gobies: ambient noise and short-range propagation in shallow streams.  

PubMed

Noise is an important theoretical constraint on the evolution of signal form and sensory performance. In order to determine environmental constraints on the communication of two freshwater gobies Padogobius martensii and Gobius nigricans, numerous noise spectra were measured from quiet areas and ones adjacent to waterfalls and rapids in two shallow stony streams. Propagation of goby sounds and waterfall noise was also measured. A quiet window around 100 Hz is present in many noise spectra from noisy locations. The window lies between two noise sources, a low-frequency one attributed to turbulence, and a high-frequency one (200-500 Hz) attributed to bubble noise from water breaking the surface. Ambient noise from a waterfall (frequencies below 1 kHz) attenuates as much as 30 dB between 1 and 2 m, after which values are variable without further attenuation (i.e., buried in the noise floor). Similarly, courtship sounds of P. martensii attenuate as much as 30 dB between 5 and 50 cm. Since gobies are known to court in noisy as well as quiet locations in these streams, their acoustic communication system (sounds and auditory system) must be able to cope with short-range propagation dictated by shallow depths and ambient noise in noisy locations. PMID:12880062

Lugli, M; Fine, M L

2003-07-01

114

Journal of Power Sources 143 (2005) 173178 Short communication  

E-print Network

by virtue of their high-energy efficiency, pollution free char- acteristics, compactness in design. · Water exists only in the vapor form and the effects of pore plugging are neglected [42,43]. · The fuel cell is isothermal. · Darcy's law is valid. · Fluid is incompressible. · Temperature does not affect

Subramanian, Venkat

115

Biosensors and Bioelectronics 22 (2007) 32523255 Short communication  

E-print Network

production (49 mW/m2 ) compared to a nonrotating cathode system (29 mW/m2 ). The increased dissolved oxygen the dissolved oxygen that is naturally present in water. Dissolved oxygen is essential for the cathodic reaction surface; or they are installed in deep ocean locations where relatively high oxygen levels (dissolved

116

Short communication Do desiccation tolerances control the vertical distribution  

E-print Network

strategies at the level of the whole plant, such as downsizing (e.g. smaller, narrower leaves), reduced reserved. Keywords: Desiccation; Re-hydration; Photosynthesis; Zostera japonica; Zostera marina 1 adaptations to reduce tissue water loss (Zaneveld, 1937), the ability to maintain high rates of photosynthesis

Sherman, Tim

117

Short Communication Epidemiology of Staphylococcus aureus in Pigs  

E-print Network

(ST) 398 is the predominant clone in pigs from Europe and North America, whereas MRSA ST9 mec type (SCCmec) IV (n = 5) and ST88-SCCmec IV (n = 1) clones. The luk-PV genes encoding Panton IV clone, were highly prevalent compared to data from industrialized countries. This finding

Paris-Sud XI, Université de

118

SHORT COMMUNICATION Circulating plasma testosterone during early neonatal  

E-print Network

monogamous and biparental prairie vole (Microtus ochrogaster) Sarah W. Lansing a , Jeffrey A. French b behavior; Voles Summary Adult male prairie voles (Microtus ochrogaster) are highly gregarious and socially (Microtus ochrogaster) has become the preeminent model in which to study the neuroendocrine basis of complex

French, Jeffrey A.

119

Technology Development for High Efficiency Optical Communications  

NASA Technical Reports Server (NTRS)

Deep space optical communications is a significantly more challenging operational domain than near Earth space optical communications, primarily due to effects resulting from the vastly increased range between transmitter and receiver. The NASA Game Changing Development Program Deep Space Optical Communications Project is developing four key technologies for the implementation of a high efficiency telecommunications system that will enable greater than 10X the data rate of a state-of-the-art deep space RF system (Ka-band) for similar transceiver mass and power burden on the spacecraft. These technologies are a low mass spacecraft disturbance isolation assembly, a flight qualified photon counting detector array, a high efficiency flight laser amplifier and a high efficiency photon counting detector array for the ground-based receiver.

Farr, William H.

2012-01-01

120

Short Communication: Pasteurization of Milk Abolishes Bovine Herpesvirus 4 Infectivity  

Microsoft Academic Search

Bovine herpesvirus 4 (BoHV-4) is a gammaherpesvi- rus highly prevalent in the cattle population that has been isolated from the milk and the serum of healthy infected cows. Several studies reported the sensitivity and the permissiveness of some human cells to BoHV-4 infection. Moreover, our recent study demonstrated that some human cells sensitive but not permissive to BoHV-4 support a

C. Bona; B. Dewals; L. Wiggers; K. Coudijzer; A. Vanderplasschen; L. Gillet

2005-01-01

121

Journal of Power Sources 139 (2005) 289294 Short communication  

E-print Network

, such as notebook- PCs, PDAs, mobile phones and camcorders. Total sales of the cells in 2002 have been reportedCoO2 cathode using surfactant for high-density Li-ion cell Jisuk Kima, Byoungsoo Kimb, Joon-Gon Leeb a surfactant increases the capacity of a Li-ion cell by 10% compared with using bare LiCoO2. The coating method

Park, Byungwoo

122

SHORT COMMUNICATION CD45RA T-cell activation without proliferation by a  

E-print Network

SHORT COMMUNICATION CD45RA T-cell activation without proliferation by a partial agonist monoclonal, multiple sclerosis and graft rejection.17­21 It is unclear how much integrin signaling leading to T-cell to memory T cells apparent lower activation threshold24 and the correlation of integrin involvement in T-cell

Cai, Long

123

Short-Form Versions of the Spanish MacArthur-Bates Communicative Development Inventories  

ERIC Educational Resources Information Center

The Spanish-language MacArthur-Bates Communicative Development Inventories (S-CDIs) are well-established parent report tools for assessing the language development of Spanish-speaking children under 3 years. Here, we introduce the short-form versions of the S-CDIs (SFI and SFII), offered as alternatives to the long forms for screening purposes or

Jackson-Maldonodo, Donna; Marchman, Virginia A.; Fernald, Lia C. H.

2013-01-01

124

Short Communication ``Entombed Pollen": A new condition in honey bee colonies associated  

E-print Network

disorder Bee bread Honey bee Pesticide residues Physical encapsulation Entombed pollen a b s t r a c t HereShort Communication ``Entombed Pollen": A new condition in honey bee colonies associated, Harrisburg, PA 17074, United States b Bee Research Lab, USDA-ARS Bldg. 476, BARC-East Beltsville, MD 20705

Tarpy, David R.

125

SHORT COMMUNICATION Discovery of a Gall-Forming Midge, Asphondylia pilosa Kieffer (Diptera  

E-print Network

SHORT COMMUNICATION Discovery of a Gall-Forming Midge, Asphondylia pilosa Kieffer (Diptera as an ornamental for its bright yellow, pea-like flower. The plant found the western U.S. maritime zone this plant in the 1960's for biological control and subsequently introduced and released two biocontrol

126

Short communication Inaccessible food cues affect stress and weight gain in calorically-restricted  

E-print Network

responses which prepare organisms for food intake (Woods, 1991). Yet, the effects of chronic, unconditionedShort communication Inaccessible food cues affect stress and weight gain in calorically) in animals has various physiological benefits, including increased longevity, postponement of age- related

Sokolowski, Marla

127

Short communication Improved reproducibility in the determination of the molecular weight  

E-print Network

Short communication Improved reproducibility in the determination of the molecular weight characterization of chitosan being reported by Wu and coworkers in 1976, who devised a protocol involving injection, UV, detection were employed and molecular weights were determined relative to dextran standards (Wu

Buschmann, Michael

128

SHORT COMMUNICATION Lowering sample size in comparative analyses can indicate a  

E-print Network

SHORT COMMUNICATION Lowering sample size in comparative analyses can indicate a correlation where circum- stances, using a low sample size will produce results indicating an evolutionary correlation between characters where an analysis of the same pattern utilizing a larger sample size will show

Lindenfors, Patrik

129

Short communication Hierarchical SiOx nanoconifers for Li-ion battery anodes with  

E-print Network

Short communication Hierarchical SiOx nanoconifers for Li-ion battery anodes with structural and kinetic stability. a r t i c l e i n f o Article history: Received 12 October 2012 Received in revised oxide Li rechargeable battery Anode Nanoconifer Nanowire Thermal evaporation a b s t r a c t Silicon sub

Jo, Moon-Ho

130

Z .Advances in Environmental Research 4 2000 357 362 Short communication  

E-print Network

Z .Advances in Environmental Research 4 2000 357 362 Short communication Predicting humidity effect,U , Mark P. Calb a U.S. Army Construction Engineering Research Laboratory, Champaign, IL 61826-9005, USA b%. This numerical approach is straightforward and better suited than the original graphical technique for use

Cal, Mark P.

131

SHORT COMMUNICATION, C Basic & Clinical Pharmacology & Toxicology 2005, 96, 242243. Printed in Denmark . All rights reserved  

E-print Network

in Denmark . All rights reserved Copyright C ISSN 1742-7835 Short Communication Internal Exposure of Children in the internal exposure of children occurring during acute inhalation of volatile or- ganic compounds to an airborne exposure over a wide range of concentrations, and therefore is a special scenario

Duffy, Ken

132

Short communication No violation of the Leibniz rule. No fractional derivative  

E-print Network

Short communication No violation of the Leibniz rule. No fractional derivative Vasily E. Tarasov 2013 Keywords: Fractional derivative Leibniz rule a b s t r a c t We demonstrate that a violation fractional derivatives Da , which satisfy the Leibniz rule Da ðfg? ¼ ðDa f?g þ fðDa g?, should have

Tarasov, Vasily E.

133

Short communication Elevated CO2 and O3t concentrations differentially affect selected  

E-print Network

are expected to affect soil fauna (Cou^teaux and Bolger, 2000). Because elevated [CO2] usually increases plantShort communication Elevated CO2 and O3t concentrations differentially affect selected groups; accepted 5 April 2004 Abstract Rising atmospheric CO2 concentrations may change soil fauna abundance. How

134

SHORT COMMUNICATION Nutritional benefits of filial cannibalism in three-spined  

E-print Network

SHORT COMMUNICATION Nutritional benefits of filial cannibalism in three-spined sticklebacks-Verlag 2008 Abstract Although filial cannibalism (eating one's own offspring) occurs in numerous species by filial cannibalism. Keywords Adaptive value . Body condition . Brood care . Egg cannibalism . Fish . Mass

135

SHORT COMMUNICATION PATTERNS OF FISH DIVERSITY IN A MAINSTEM MISSOURI RIVER  

E-print Network

INTRODUCTION Across the world, dams are filling with sediment and as a result, novel delta habitats are formingSHORT COMMUNICATION PATTERNS OF FISH DIVERSITY IN A MAINSTEM MISSOURI RIVER RESERVOIR at the confluence of the Niobrara and Missouri Rivers in the Lewis and Clark Reservoir. The delta provides diverse

136

SHORT COMMUNICATION EFFECTS OF DAM REMOVAL ON BROOK TROUT IN A WISCONSIN STREAM  

E-print Network

SHORT COMMUNICATION EFFECTS OF DAM REMOVAL ON BROOK TROUT IN A WISCONSIN STREAM EMILY H. STANLEY, and the removal of dams is often viewed as a means of increasing habitat availability and restoring migratory the removal of a pair of low-head dams from Boulder Creek, Wisconsin, U.S.A. in 2003 to determine if removal

Stanley, Emily

137

Type of contribution: Short communication1 Avoidance of low doses of naphthalene by Collembola3  

E-print Network

1 Type of contribution: Short communication1 2 Avoidance of low doses of naphthalene by Collembola3 14 PAH avoidance by soil springtails is species-specific and differs among15 populations of the same are considered. We compared the avoidance behaviour of several22 strains of springtails (Arthropoda: Collembola

Paris-Sud XI, Université de

138

SHORT COMMUNICATION Can phosphorus limitation contribute to the maintenance of sex?  

E-print Network

SHORT COMMUNICATION Can phosphorus limitation contribute to the maintenance of sex? A test of a key). The `cost of males' is one faced, at least in principle, by all dioecious sexuals (Maynard Smith, 1978 to sexual individuals. Most work on potential benefits of sex has focused on genetic consequences

Neiman, Maurine

139

Short communication Phenoloxidase and QX disease resistance in Sydney rock oysters  

E-print Network

Short communication Phenoloxidase and QX disease resistance in Sydney rock oysters (Saccostrea October 2003 Abstract QX is a fatal disease in Sydney rock oysters (Saccostrea glomerata) that results breeding program has selected oysters with enhanced phenoloxidase (PO) activities. The third generation

Raftos, David

140

Short communication Equatorial influence of QuikSCAT winds in an isopycnal ocean model  

E-print Network

Short communication Equatorial influence of QuikSCAT winds in an isopycnal ocean model compared to NCEP2 winds ChuanLi Jiang a,*, LuAnne Thompson a , Kathryn A. Kelly b a School of Oceanography 2008 a b s t r a c t An ocean model was used to examine whether the scatterometer winds can improve

Jiang, ChuanLi

141

Short Communication fMRI of Deep Brain Stimulation at the Rat Ventral Posteromedial Thalamus  

E-print Network

form 25 September 2013 Accepted 1 November 2013 Available online xxx Keywords: Striatum Deep brainShort Communication fMRI of Deep Brain Stimulation at the Rat Ventral Posteromedial Thalamus Q3 YenMRI) of deep brain stimulation (DBS) has potentials to reveal neuroanatomical connectivity of a specific brain

Duong, Timothy Q.

142

Short communication The effect of repetitive transcranial magnetic stimulation on long-term  

E-print Network

Short communication The effect of repetitive transcranial magnetic stimulation on long investigated the effect of repetitive transcranial magnetic stimulation (rTMS) on long-term potentiation (LTP transcranial magnetic stimulation (rTMS); Hippocampus; Long-term potentiation (LTP); Eddy current Transcranial

Kawato, Suguru

143

Short communication Litter contribution to diurnal and annual soil respiration in a tropical  

E-print Network

Short communication Litter contribution to diurnal and annual soil respiration in a tropical Universidad San Antonio Abad, Cusco, Peru a r t i c l e i n f o Article history: Received 10 October 2008 soil respiration variation Tropical montane cloud forest Litter respiration a b s t r a c t Respiration

Malhi, Yadvinder

144

Short Communication Influence of permafrost on water storage in West Siberian peatlands revealed from a  

E-print Network

Short Communication Influence of permafrost on water storage in West Siberian peatlands revealed by permafrost. We present a new database of 12 705 measurements of vertical water content and bulk soil properties from 98 permafrost and non-permafrost cores collected in raised bogs and peat plateaus across

Smith, Laurence C.

145

Short Communication A First Pan-Arctic Assessment of the Influence of Glaciation, Permafrost,  

E-print Network

Short Communication A First Pan-Arctic Assessment of the Influence of Glaciation, Permafrost , northwards of $458N latitude) are intersected with new global databases on topography, permafrost, peatlands of permafrost appear most important to the existence of lakes. Lake densities and area fractions average $300

Smith, Laurence C.

146

Short communication Biosensor based on chemically-designed anchorable cytochrome c  

E-print Network

Short communication Biosensor based on chemically-designed anchorable cytochrome c Available online 10 November 2012 Keywords: Cytochrome c Bioelectrochemistry Direct electron transfer Chemical manipulation Oxidative stress Aquatic cells a b s t r a c t A novel third generation biosensor

Dalang, Robert C.

147

SHORT COMMUNICATION TRPV6 channel controls prostate cancer cell proliferation via  

E-print Network

-phase of cell cycle and (iii) proliferating cell nuclear antigen (PCNA) expression. We demonstrate that the Ca2SHORT COMMUNICATION TRPV6 channel controls prostate cancer cell proliferation via Ca2 þ /NFATP cell line) proliferation by decreasing: (i) proliferation rate; (ii) cell accumulation in the S

Cai, Long

148

Short Communication Revisit on the evolutionary relationship between alternative splicing and  

E-print Network

Short Communication Revisit on the evolutionary relationship between alternative splicing and gene for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200433, China b Department duplication Alternative splicing Copy number variation Exon­intron structure Gene duplications and alternative

Gu, Xun

149

SHORT COMMUNICATION Wild boar (Sus scrofa) harvesting using the espera hunting  

E-print Network

SHORT COMMUNICATION Wild boar (Sus scrofa) harvesting using the espera hunting method: side effects impacts in many popula- tions. We investigated the sex ratio and age class structure in hunting bags of wild boar harvested by espera-- nocturnal single hunt at bait--during four hunting seasons in Alentejo

Paris-Sud XI, Université de

150

Short communication Air humidity and water pressure effects on the performance of  

E-print Network

Short communication Air humidity and water pressure effects on the performance of air-saturated air. When the cathode was exposed to higher water pressures by placing the cathode in a horizontal salt precipitation, and therefore control of air humidity and water pressure may need to be considered

151

Short Communication Pollination of the European food-deceptive Traunsteinera globosa  

E-print Network

Short Communication Pollination of the European food-deceptive Traunsteinera globosa (Orchidaceae- ally flower early in spring and rely on nai¨ve pollinators for their reproduction. Some species however flowering communities, deceptive orchids may suffer from competition for pollinator re- sources, or might

Alvarez, Nadir

152

Short Communication Effect of exogenous electron shuttles on growth and fermentative metabolism  

E-print Network

) and benzyl viologen were used to shift fermentative metabolism towards alcohol produc- tion (Datta and ZeikusShort Communication Effect of exogenous electron shuttles on growth and fermentative metabolism exogenous electron shuttles on the growth and glucose fermentative metab- olism of Clostridium sp. BC1

Johnson, Peter D.

153

Short communication Optimization of hybrid ground coupled and air source heat pump systems  

E-print Network

Short communication Optimization of hybrid ­ ground coupled and air source ­ heat pump systems to water heat pump Thermal storage device Hybrid HVAC system Energy efficiency Numerical simulation a b driven by an air to water heat pump and around the 82% compared with an HVAC system driven by a ground

Fernández de Córdoba, Pedro

154

SHORT COMMUNICATION Sea level pressure observations from Dutch ships 1854-1938 incorporated  

E-print Network

bases; COADS; marine data; Dutch ship observations. #12;- 4 - The pre-1939 meteorological data- 1 - SHORT COMMUNICATION Sea level pressure observations from Dutch ships 1854-1938 incorporated of the 5.7 million punched sea level pressure observations from Dutch ships 1854-1938 has been under debate

Brandsma, Theo

155

SHORT COMMUNICATION Tetrodotoxin affects survival probability of rough-skinned newts  

E-print Network

SHORT COMMUNICATION Tetrodotoxin affects survival probability of rough-skinned newts (Taricha (Taricha granulosa), which con- tains a powerful neurotoxin called tetrodotoxin (TTX), and the common Thamnophis sirtalis Á Taricha granulosa Á Coevolution Á Predator­prey Á Tetrodotoxin Á Antipredator Á Defense

Brodie III, Edmund D.

156

Drivers' Anonymity with a Short Message Length for Vehicle-to-Vehicle Communications Network  

E-print Network

Drivers' Anonymity with a Short Message Length for Vehicle-to-Vehicle Communications Network Nader@eng.wayne.edu Abstract--In this paper, we propose a broadcast protocol to preserve drivers' anonymity in vehicle anonymity, authentication and message integrity. The advantages of HMAC over asymmetric cryptographic

Mahmud, Syed Masud

157

Short communication1 Evaluation of the presence of the bap gene in Staphylococcus4  

E-print Network

1 Short communication1 2 3 Evaluation of the presence of the bap gene in Staphylococcus4 aureus the biofilm-associated protein, BAP, which is31 involved in biofilm formation in Staphylococcus aureus. So far the prevalence of this gene among S. aureus isolates should be very low.37 Keywords: Staphylococcus aureus; Bap

Paris-Sud XI, Université de

158

Short communication Density of fallen ash after the eruption of Tambora in 1815  

E-print Network

Short communication Density of fallen ash after the eruption of Tambora in 1815 Richard B. Stothers of the volcano Tambora, Indonesia, in 1815 is presented by examining contemporary reports. This eruption produced of Tambora, can be safely stated to be 636 kg m? 3 . Published by Elsevier B.V. Keywords: volcanic eruption

159

Short communication Tree biomass and net increment in an old aspen forest in  

E-print Network

Short communication Tree biomass and net increment in an old aspen forest in New Mexico Dan for a substantial period. We remeasured live tree biomass of this case- study forest after an additional 27 years production; Old growth forest; Forest production Trends in biomass accumulation in old forests

Binkley, Dan

160

Short Communication Artificial light at night alters delayed-type hypersensitivity reaction in  

E-print Network

Short Communication Artificial light at night alters delayed-type hypersensitivity reaction increased the DTH reaction in dark nights, but exposure to nighttime light pre- vented this response in revised form 20 May 2013 Accepted 26 May 2013 Available online 4 June 2013 Keywords: Light pollution

Nelson, Randy J.

161

Short Communication Whole blood is the sample matrix of choice for monitoring systemic  

E-print Network

Short Communication Whole blood is the sample matrix of choice for monitoring systemic triclocarban Biomonitoring Whole blood a b s t r a c t The antibacterial triclocarban (TCC) concentrates in the cellular fraction of blood. Consequently, plasma levels are at least two-fold lower than the TCC amount present

Hammock, Bruce D.

162

SHORT COMMUNICATION 1,3-Di(2-pyrrolyl)azulene: An Efficient Luminescent Probe for Fluoride  

E-print Network

SHORT COMMUNICATION 1,3-Di(2-pyrrolyl)azulene: An Efficient Luminescent Probe for Fluoride Husein. In this paper we report on the preparation and host­guest chemistry of Introduction Halides, especially fluoride-like chemosensor that turns fluorescent upon binding the fluoride anion. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451

Gunawardena, Jeremy

163

Short Communication CORAL: QSPR model of water solubility based on local and global SMILES attributes  

E-print Network

Short Communication CORAL: QSPR model of water solubility based on local and global SMILES model for water solubility is described in detail. a r t i c l e i n f o Article history: Received 20 Keywords: Water solubility QSPR Monte Carlo technique CORAL software a b s t r a c t Water solubility

Gini, Giuseppina

164

Short Communication The effect of bovine serum albumin on batch and continuous enzymatic  

E-print Network

Short Communication The effect of bovine serum albumin on batch and continuous enzymatic cellulose Enzyme stability Cellulose a b s t r a c t Bovine serum albumin (BSA) was applied as a model non- teins such as bovine serum albumin (BSA) has been shown to en- hance cellulose hydrolysis by enzymes

California at Riverside, University of

165

Seed treatment with GA 3 or stratification enhances emergence of some strawberry tree genotypes - Short communication  

Microsoft Academic Search

Demirsoy L., Demirsoy H., Celikel G., Macit I., Ersoy B. , 2010: Seed treatment with GA 3 or stratification en - hances emergence of some strawberry tree genotypes - Short communication . Hort. Sci. (Prague), 37: 34-37. The strawberry tree is a valuable ornamental plant because of its attractive red fruits in the fall and winter, and pink - ish-white

L. Demirsoy; H. Demirsoy; G. Celikel; I. Macit; B. Ersoy

2010-01-01

166

Short Communication1 Vitamin E Status and Quality of Life in the Elderly:4  

E-print Network

1 Short Communication1 2 3 Vitamin E Status and Quality of Life in the Elderly:4 Influence their relationship to40 vitamin E status, inflammation and tryptophan (TRP) metabolism in the elderly. Sixty-nine elderly41 subjects recruited from the Three-City (3C) cohort study participated in the study. Quality

Paris-Sud XI, Université de

167

392 ShortCommunications [Auk, Vol. 105 The Relationship Between Hylocichia and Catharus (Turdinae)  

E-print Network

392 ShortCommunications [Auk, Vol. 105 The Relationship Between Hylocichia and Catharus (Turdinae. ustulatus(A.O.U. 1983). His decision was based largely on the super- ficial resemblance between the Wood American Catharus thrushes, should be considered congeneric with the Neotropical group of Catharus thrushes

Winker, Kevin

168

Short communication: Reactivity of diacetyl with cleaning and sanitizing agents.  

PubMed

Diacetyl is used to impart a buttery flavor to numerous food products such as sour cream, cottage cheese, vegetable oil-based spreads, baked goods, and beverages. Recent studies have linked exposure to high concentrations of diacetyl and the onset of bronchiolitis obliterans. Due to the reported risks that diacetyl may pose, many food companies have altered practices to reduce worker exposure to diacetyl, including the use of personal respirators, improved air handling systems, and adequate cleaning practices. Commonly used cleaning and sanitizing agents may be reactive with diacetyl; however, the efficacy of these chemicals has not been studied in detail and remains unclear. The objective of this work was to study the reaction chemistry of diacetyl with common industrial cleaning and sanitizing chemicals. The reactions were assessed at equimolar concentrations and analyzed by gas chromatography-mass spectrometry. Peroxyacetic acid was most reactive with diacetyl (95% reduction in diacetyl), followed by sodium hypochlorite (76% reduction), and hydrogen peroxide (26% reduction). Benzalkonium chloride (BAC) did not react with diacetyl. Acetic acid was detected as the main product of reactions of diacetyl with peroxyacetic acid, sodium hypochlorite, and hydrogen peroxide. 1,1-Dichloro-2-propanone and 1,1,1-trichloropropanone were also identified as volatile reaction products in the sodium hypochlorite reactions. PMID:23063162

Rincon-Delgadillo, M I; Lopez-Hernandez, A; Rankin, S A

2013-01-01

169

Optical Communications for High-Altitude Platforms  

Microsoft Academic Search

This paper contains a review of technologies, theoretical studies, and experimental field trials for optical communications from and to high-altitude platforms (HAPs). We discuss the pointing, acquisition, and tracking of laser terminals and describe how laser beams with low divergence can be used to transmit data at multi-Gigabits per second. Investigating the influence of the atmosphere, background light, and flight

Franz Fidler; Markus Knapek; Joachim Horwath; Walter R. Leeb

2010-01-01

170

Preprocessing communication unit (PCU) with short message service (SMS) communication channels for AVL tracking  

NASA Astrophysics Data System (ADS)

The Preprocessing GPS - SMS Communication Unit (PCU) is a mobile tracking device used within AVL tracking systems for determining the location of vehicles. It was designed primarily to utilize the SMS service of the GSM network for communicating. The use of SMS messages is part of an effort aimed at providing a cost effective alternative for tracking the location of vehicles. Its primary function is to send information about user location across a GSM network to a Central Base Station (CBS) from which assets are being tracked. Though SMS is the main bearer, the unit is also capable of using Circuit Switch Data Service (CSD) to send and receive data from the Base Station (BS). The PCU was developed as a small hardware unit based on the Microchip microcontroller, with a multiplexer switching two RS 232 serial inputs. One input is dedicated to the GPS receiver and the second one to the wireless modem.

Young, Andrew S.; Skobla, Joseph

2003-08-01

171

High Average Power, High Energy Short Pulse Fiber Laser System  

SciTech Connect

Recently continuous wave fiber laser systems with output powers in excess of 500W with good beam quality have been demonstrated [1]. High energy, ultrafast, chirped pulsed fiber laser systems have achieved record output energies of 1mJ [2]. However, these high-energy systems have not been scaled beyond a few watts of average output power. Fiber laser systems are attractive for many applications because they offer the promise of high efficiency, compact, robust systems that are turn key. Applications such as cutting, drilling and materials processing, front end systems for high energy pulsed lasers (such as petawatts) and laser based sources of high spatial coherence, high flux x-rays all require high energy short pulses and two of the three of these applications also require high average power. The challenge in creating a high energy chirped pulse fiber laser system is to find a way to scale the output energy while avoiding nonlinear effects and maintaining good beam quality in the amplifier fiber. To this end, our 3-year LDRD program sought to demonstrate a high energy, high average power fiber laser system. This work included exploring designs of large mode area optical fiber amplifiers for high energy systems as well as understanding the issues associated chirped pulse amplification in optical fiber amplifier systems.

Messerly, M J

2007-11-13

172

Rectangular Microstirp Patch Antenna Design at THz Frequency for Short Distance Wireless Communication Systems  

NASA Astrophysics Data System (ADS)

In this paper, we have presented the simulation results of a rectangular microstrip patch antenna at terahertz (THz) frequency ranging from 0.7 to 0.85 THz. THz electromagnetic wave can permit more densely packed communication links with increased security of communication transmission. The simulated results such as gain, radiation efficiency and 10 dB impedance bandwidth of rectangular microstrip patch antenna at THz frequencies without shorting post configuration are 3.497 dB, 55.71% and 17.76%, respectively, whereas with shorting post configuration, corresponding parameters are 3.502 dB, 55.88% and 17.27%. The simulation has been performed by using CST Microwave Studio, which is a commercially available electromagnetic simulator based on the method of finite difference time domain technique.

Sharma, Aditi; Singh, G.

2009-01-01

173

Short communication Satellite-derived surface water pCO2 and airsea CO2 fluxes  

E-print Network

Short communication Satellite-derived surface water pCO2 and air­sea CO2 fluxes in the northern for the estimation of the partial pressure of carbon dioxide (pCO2) and air­sea CO2 fluxes in the northern South), respectively, the monthly pCO2 fields were computed. The derived pCO2 was compared with the shipboard pCO2

174

Short communication Land use change patterns in the Rio de la Plata grasslands: The influence of  

E-print Network

Short communication Land use change patterns in the Ri´o de la Plata grasslands: The influence) hold one of the largest area of temperate grasslands of the world, the Ri´o de la Plata grasslands (RPG­387) (Fig. 1). Ri´o de la Plata grasslands have an area of 3.4 ? 106 km2 at the center-east of Argentina

Nacional de San Luis, Universidad

175

Meteor scatter radio communication at high latitudes  

NASA Astrophysics Data System (ADS)

A brief historical and physical description of the meteor burst communications (MBC) technique is given together with a discussion of the advantages of very high frequency MBC, with respect to conventional high frequency communication, when used at high latitudes. A recently deployed high latitude MBC propagation experiment, between Bodo in Norway and Wick in Scotland (UK) is described and some of the early data gathered at frequencies close to 40 MHz and 70 MHz is presented. A theoretical description of the effects of Polarisation Rotation in a linearly polarised MBC system is developed and it is shown that at 40 MHz Polarisation Rotation, due to excess D-region ionization may cause the system performance to differ from its ambient level. Corroborative experimental results, over a temperature latitude path, are presented. Based upon the early high latitude experimental results and on the theoretical calculations, it is suggested that frequencies close to 40 MHz, in common use in atemperate latitude linearly polarised MBC systems, are too low for high latitude operation.

Cannon, P. S.; Dickson, A. H.; Armstrong, M. H.

1985-11-01

176

Public Speaking or Interpersonal Communication: The Perspective of the High Communication Apprehension Student.  

ERIC Educational Resources Information Center

Of 782 undergraduate students enrolled in either interpersonal communication or public speaking courses, the 125 students scoring high in communication apprehension were retested upon completion of the courses and analyzed for their responses to a student attitudes survey. Significantly greater numbers of the high communication apprehensive (HCA)

Pearson, Judy C.; Yoder, Donald D.

177

Optical receiver for high-speed communication  

NASA Astrophysics Data System (ADS)

For through-the-air optical communication applications, we present a high speed detector module with high bandwidth and large active area. The detector has achieved a rise time of 220 pS with a full-width-half-max of 420 pS. Data rates are expected to approach 2 GHz. The active area of the input window is 12 mm, giving a large collection surface for through-the-air applications. The detector module includes an integrated power supply having low power consumption. In comparison with other detector technologies, this new detector exceeds the speed of conventional photomultiplier designs by 3 to 5 times. In comparison with microchannel plate detectors, the speed is comparable, but the throughput of the new detector is much higher - tens of microamperes of signal current can be obtained indefinitely. Optical communication applications can be served by two different designs. In the first case, the module utilizes gain based on ordinary secondary emission materials to achieve current gains of 1500. This design is suitable for applications at the limit of the detector's bandwidth where light power is relatively high. In another design, the secondary emission material was changed to diamond film which allows five times higher gain. While the current design uses an ordinary, blue sensitive input light conversion material, higher efficiency materials are in development for signals at longer wavelength.

Mitchell, Paul A.; Grib, Valerie J.

2010-04-01

178

High-performance computing and communications  

SciTech Connect

This presentation has two parts. The first part discusses the US High-Performance Computing and Communications program -- its goals, funding, process, revisions, and research in high-performance computing systems, advanced software technology, and basic research and human resources. The second part of the presentation covers specific work conducted under this program at Argonne National Laboratory. Argonne`s efforts focus on computational science research, software tool development, and evaluation of experimental computer architectures. In addition, the author describes collaborative activities at Argonne in high-performance computing, including an Argonne/IBM project to evaluate and test IBM`s newest parallel computers and the Scalable I/O Initiative being spearheaded by the Concurrent Supercomputing Consortium.

Stevens, R.

1993-11-01

179

German Deaf People Using Text Communication: Short Message Service, TTY, Relay Services, Fax, and E-Mail  

ERIC Educational Resources Information Center

An online survey of German deaf people demonstrated that they use text communication through Short Message Service (SMS), e-mail, fax, and telephone typewriters (TTY) to communicate within communities of deaf and hearing people. SMS is used most, with more than 96% of respondents having access to a mobile phone. Most use is intrinsic and directed

Power, Des; Power, Mary R.; Rehling, Bernd

2007-01-01

180

Short communication: simultaneous analysis of reducing sugars and 5-hydroxymethyl-2-furaldehyde at a low concentration by high performance anion exchange chromatography with electrochemical detector, compared with HPLC with refractive index detector.  

PubMed

A simultaneous analysis of reducing sugars and 5-hydroxymethyl-2-furaldehyde of the Maillard reaction products was detailed. It was based on a high performance anion exchange chromatography with electrochemical detector system and an HPLC with refractive index detector. Results showed that high performance anion exchange chromatography with electrochemical detector using a CarboPac PA-1 column (Dionex Corp., Sunnyvale, CA) was more suitable for reducing sugars and 5-hydroxymethyl-2-furaldehyde determination, especially for trace analysis. The lowest detectable limit of reducing sugars and 5-hydroxymethyl-2-furaldehyde was 0.00005 mol/L in this experiment. However, HPLC with a refractive index detector always produces a tailing peak for 5-hydroxymethyl-2-furaldehyde, and mannose and fructose cannot be absolutely separated. The results of the present study could provide a more sensitive means for 5-hydroxymethyl-2-furaldehyde and reducing sugar detection. PMID:22959946

Guan, Y-G; Yu, P; Yu, S-J; Xu, X-B; Wu, X-L

2012-11-01

181

VHF General Urban Path Loss Model for Short Range Ground-to-Ground Communications  

Microsoft Academic Search

From a radio frequency propagation perspective, the general focus of the commercial wireless communications community has been primarily on frequencies above 800 MHz. Therefore, there is a limited number of available empirical data and validated prediction methods indicating what type of path loss or signal degradation one should expect in various urban settings at a very high frequency (VHF) range,

Julia Andrusenko; Richard L. Miller; Jason A. Abrahamson; Naim M. Merheb Emanuelli; Robert S. Pattay; Robert M. Shuford

2008-01-01

182

Visible light communication in dynamic environment using image/high-speed communication hybrid sensor  

NASA Astrophysics Data System (ADS)

Visible Light Communication (VLC) is a wireless communication method using LEDs. LEDs can respond in high-speed and VLC uses this characteristics. In VLC researches, there are two types of receivers mainly, one is photodiode receiver and the other is high-speed camera. A photodiode receiver can communicate in high-speed and has high transmission rate because of its high-speed response. A high-speed camera can detect and track the transmitter easily because it is not necessary to move the camera. In this paper, we use a hybrid sensor designed for VLC which has advantages of both photodiode and high-speed camera, that is, high transmission rate and easy detecting of the transmitter. The light receiving section of the hybrid sensor consists of communication pixels and video pixels, which realizes the advantages. This hybrid sensor can communicate in static environment in previous research. However in dynamic environment, high-speed tracking of the transmitter is essential for communication. So, we realize the high-speed tracking of the transmitter by using the information of the communication pixels. Experimental results show the possibility of communication in dynamic environment.

Maeno, Keita; Panahpour Tehrani, Mehrdad; Fujii, Toshiaki; Okada, Hiraku; Yamazato, Takaya; Tanimoto, Masayuki; Yendo, Tomohiro

2012-01-01

183

SHORT COMMUNICATION Ultra-high-throughput microbial community analysis  

E-print Network

Seq platforms J Gregory Caporaso1 , Christian L Lauber2 , William A Walters3 , Donna Berg-Lyons2 , James Huntley, IL, USA; 7 Illumina Cambridge Ltd., Chesterford Research Park, Saffron Walden, Essex, UK; 8

Fierer, Noah

184

Fiber Laser Front Ends for High Energy, Short Pulse Lasers  

SciTech Connect

We are developing a fiber laser system for short pulse (1-10ps), high energy ({approx}1kJ) glass laser systems. Fiber lasers are ideal for these systems as they are highly reliable and enable long term stable operation.

Dawson, J; Messerly, M; Phan, H; Siders, C; Beach, R; Barty, C

2007-06-21

185

Residues crucial for maintaining short paths in network communication mediate signaling in proteins  

PubMed Central

Here, we represent protein structures as residue interacting networks, which are assumed to involve a permanent flow of information between amino acids. By removal of nodes from the protein network, we identify fold centrally conserved residues, which are crucial for sustaining the shortest pathways and thus play key roles in long-range interactions. Analysis of seven protein families (myoglobins, G-protein-coupled receptors, the trypsin class of serine proteases, hemoglobins, oligosaccharide phosphorylases, nuclear receptor ligand-binding domains and retroviral proteases) confirms that experimentally many of these residues are important for allosteric communication. The agreement between the centrally conserved residues, which are key in preserving short path lengths, and residues experimentally suggested to mediate signaling further illustrates that topology plays an important role in network communication. Protein folds have evolved under constraints imposed by function. To maintain function, protein structures need to be robust to mutational events. On the other hand, robustness is accompanied by an extreme sensitivity at some crucial sites. Thus, here we propose that centrally conserved residues, whose removal increases the characteristic path length in protein networks, may relate to the system fragility. PMID:16738564

del Sol, Antonio; Fujihashi, Hirotomo; Amoros, Dolors; Nussinov, Ruth

2006-01-01

186

Dynamic Communicating Automata and Branching High-Level MSCs  

E-print Network

Communicating Automata · Branching High-Level MSCs ... x := new(s,x) x ? comx ! req(y) #12;Outline · Dynamic Communicating Automata · Branching High-Level MSCs ... x y x y req(y) x y com com x := new(s,x) x ? comx ! req com x := new(s,x) x ? comx ! req(y) implementable? #12;Outline · Dynamic Communicating Automata

Bollig, Benedikt

187

Spontaneous Radiation Emission from Short, High Field Strength Insertion Devices  

SciTech Connect

Since the earliest papers on undulaters were published, it has been known how to calculate the spontaneous emission spectrum from ''short'' undulaters when the magnetic field strength parameter is small compared to unity, or in ''single'' frequency sinusoidal undulaters where the magnetic field strength parameter is comparable to or larger than unity, but where the magnetic field amplitude is constant throughout the undulater. Fewer general results have been obtained in the case where the insertion device is both short, i.e., the magnetic field strength parameter changes appreciably throughout the insertion device, and the magnetic field strength is high enough that ponderomotive effects, radiation retardation, and harmonic generation are important physical phenomena. In this paper a general method is presented for calculating the radiation spectrum for short, high-field insertion devices. It is used to calculate the emission from some insertion device designs of recent interest.

Geoffrey Krafft

2005-09-15

188

High-Latitude Communications Satellite (HILACS)  

NASA Technical Reports Server (NTRS)

The Naval Postgraduate School in the AE 4871 Advanced Spacecraft Design course designed a communications satellite (HILACS) that will provide a continuous UHF communications link between stations located north of the region covered by geosynchronous communications satellites. The communications payload will operate only for that portion of the orbit necessary to provide specific coverage. The satellite orbit is elliptic with perigee at 1204 km in the Southern Hemisphere and an apogee at 14,930 km with 63.4 degrees inclination. Analysis and design of each of the subsystems was done to the extent possible within the constraints of an eleven week quarter and the design and analysis tools available. Work was completed in orbital analysis, the reaction control system, attitude control subsystem, electric power subsystem, telemetry, tracking, and control, thermal control subsystem, and the structures subsystem. The design team consisted of 12 students. Additional support was provided by the Jet Propulsion Laboratory and the Naval Research Laboratory.

1990-01-01

189

Iridium: Global OTH data communications for high altitude scientific ballooning  

NASA Astrophysics Data System (ADS)

While the scientific community is no stranger to embracing commercially available technologies, the growth and availability of truly affordable cutting edge technologies is opening the door to an entirely new means of global communications. For many years high altitude ballooning has provided science an alternative to costly satellite based experimental platforms. As with any project, evolution becomes an integral part of development. Specifically in the NSBF ballooning program, where flight durations have evolved from the earlier days of hours to several weeks and plans are underway to provide missions up to 100 days. Addressing increased flight durations, the harsh operational environment, along with cumbersome and outdated systems used on existing systems, such as the balloon vehicles Support Instrumentation Package (SIP) and ground-based systems, a new Over-The-Horizon (OTH) communications medium is sought. Current OTH equipment planning to be phased-out include: HF commanding systems, ARGOS PTT telemetry downlinks and INMARSAT data terminals. Other aspects up for review in addition to the SIP to utilize this communications medium include pathfinder balloon platforms - thereby, adding commanding abilities and increased data rates, plus providing a package for ultra-small experiments to ride aloft. Existing communication systems employed by the National Scientific Balloon Facility ballooning program have been limited not only by increased cost, slow data rates and "special government use only" services such as TDRSS (Tracking and Data Relay Satellite System), but have had to make special provisions to geographical flight location. Development of the Support Instrumentation Packages whether LDB (Long Duration Balloon), ULDB (Ultra Long Duration Balloon) or conventional ballooning have been plagued by non-standard systems configurations requiring additional support equipment for different regions and missions along with a myriad of backup for redundancy. Several beneficial points provided by the Iridium platform include pure global accessibility (as well as polar), cost effectiveness because it is available as a COTS (Commercially Off The Shelf) technology, reliability in that the equipment must operate in extreme conditions (near space), integration and development time into current systems must be minimized. As a bonus Motorola and NAL Research Corporation are developing SBD (Short Burst Data) into the Iridium network. This may lead the way to a global IP (Internet Protocol) node based ballooning platform. The Iridium satellite data modems employ the Iridium Low-Earth Orbit (LEO) satellite network. The scope of this paper is to introduce an OTH communications alternative, albeit not necessarily a primary one, to existing ballooning platforms using COTS based emerging technologies. Design aspects, characteristics, actual flight testing statistics, principles of the Iridium modems and communication paths are described including payload and support instrumentation interfacing. Not limited to high altitude ballooning, the Iridium communications platform opens a new era in remote commanding and data retrieval.

Denney, A.

190

Assessment of highly active dune mobility in the medium, short and very short term  

NASA Astrophysics Data System (ADS)

Dune activity or stability has usually been studied over long time periods; however, this may not reflect changes that occur in the short term, especially for highly active dunefields. Extreme wind conditions that are generated near the Strait of Gibraltar (SW Spain) have given rise to the transgressive Valdevaqueros dunefield. The current work focuses on analyzing the sand drift potential and the evolution of the dune profile in the medium term (months), the short term (days) and the very short term (hours). Topographic data, which were collected with a differential GPS, were interpreted from reconstructed empirical orthogonal functions (EOF). The results showed that generally the dune profile presented shifting morphologies, especially around the crest and brink, and a trend towards migration to a gentler steady state. As a result, the leeward side adopted continuous slope variations during the different survey periods, whereas the windward slope did not undergo any significant change. Lateral and vertical displacements were analyzed during a severe easterly sandstorm, when the dune brink experienced an advance migration rate of 1.75 m in 24 h. Sand transport rates of 25.5-36.5 m 3 m - 1 month - 1 , 22.52 m 3 m - 1 day - 1 and 0.93 m 3 m - 1 h - 1 were measured for the medium term, short term and very short term, respectively. These values were compared to the theoretical sand transport rate for Valdevaqueros dune, based on the classic Bagnold equation as well other more recent formulae, to obtain a ratio between the real and the theoretical rates for each study period. These results together with the sand drift potential (up to 10,000 vector units) demonstrate that Valdevaqueros (Tarifa) is a dunefield with one of the highest sand transport capacities in Europe.

Navarro, Marina; Muoz-Prez, Juan J.; Romn-Sierra, Jorge; Tsoar, Haim; Rodrguez, Inmaculada; Gmez-Pina, Gregorio

2011-06-01

191

Detection of high-resolution Raman spectra in short oligonucleotides  

NASA Astrophysics Data System (ADS)

High-resolution spectra of single-chain short oligonucleotides d(20G, 20T), where d is a deoxyribonucleoside, G is guanine, and T is thymine, have been obtained by the highly sensitive nonresonant Raman scattering method of biomacromolecules. In addition to their own multifunctional significance, short oligonucleotides attract interest as ideal model objects for revealing poorly studied peculiarities of tertiary and quaternary structures of DNA. The detection of narrow spectral lines has allowed determining the characteristic time scale and makes it possible to study the dynamics of fast relaxation processes of vibrational motions of atoms in biomacromolecules. It has been found that the FWHM of the narrowest 1355.4 cm-1 spectral line attributed to the vibrations of the dT methyl group is 14.6 cm-1. The corresponding lifetime is 0.38 ps.

Bairamov, F. B.; Poloskin, E. D.; Chernev, A. L.; Toporov, V. V.; Dubina, M. V.; Lahderanta, E.; Lipsanen, H.; Bairamov, B. Kh.

2014-06-01

192

Soft calls and broadcast calls in the corncrake as adaptations to short and long range communication.  

PubMed

Because birds' acoustic signals function in antagonistic interactions between males and in female attraction, a majority of vocalisations are loud. In contrast, some birds, additionally produce soft vocalisations in escalated agonistic and sexual contexts. Nevertheless, the relationship between the acoustic parameters of such signals and their function is not clear. Here I investigate the sound transmission degradation properties of soft and broadcast (loud) calls in the corncrake using calls with natural and changed amplitude. I show that, if played at the same amplitude, the maximum limit for communication distance with soft calls was significantly shorter than that of broadcast calls, indicating that frequency structure is important in determining the range of both signals independently of their amplitude. At the same time, the values of excess attenuation were lower for soft calls than for broadcast calls at most distances, which suggests that the short transmission of soft calls is achieved mostly due to their low and narrow frequency ranges, promoting their masking by ambient noise. Finally, contrary to soft calls, changes in the energy of tails of echoes in broadcast calls were associated with the distance of propagation, which might be useful in assessing the distance to senders. I suggest that the acoustic structure of soft vocalisations can be used to limit the range of the signal, which might be helpful in eavesdropping avoidance, whereas broadcast calls are designed for long-range transmission. PMID:23876392

R?k, Pawe?

2013-10-01

193

Trend on High-speed Power Line Communication Technology  

NASA Astrophysics Data System (ADS)

High-speed power line communication (PLC) is useful technology to easily build the communication networks, because construction of new infrastructure is not necessary. In Europe and America, PLC has been used for broadband networks since the beginning of 21th century. In Japan, high-speed PLC was deregulated only indoor usage in 2006. Afterward it has been widely used for home area network, LAN in hotels and school buildings and so on. And recently, PLC is greatly concerned as communication technology for smart grid network. In this paper, the author surveys the high-speed PLC technology and its current status.

Ogawa, Osamu

194

High Resolution Statistical Characterization of Fading on Meteor Communication Channels.  

National Technical Information Service (NTIS)

This documents describes the second part of statistical study of fading on meteor communication channels based on data obtained from the Geophysics Laboratory's High Latitude Meteor Scatter Test Bed. In this experiment the sampling rate is increased from ...

J. A. Weitzen, J. C. Ostergaard, S. W. Li

1990-01-01

195

An Outcome Study of Short-Term Communication Training with Married Couples.  

ERIC Educational Resources Information Center

Compared communication training, interaction insight training, and no treatment for changes in marital verbal interaction and spouses' ratings of each other on the Barrett-Lennard Relationship Inventory. Communication training produced increases in assertive requests. Both treatments reduced disagreement. Communication training produced a decrease

Epstein, Norman; Jackson, Elizabeth

1978-01-01

196

Multimethod communication for high-performance metacomputing applications  

SciTech Connect

Metacomputing systems use high-speed networks to connect supercomputers, mass storage systems, scientific instruments, and display devices with the objective of enabling parallel applications to access geographically distributed computing resources. However, experience shows that high performance often can be achieved only if applications can integrate diverse communication substrates, transport mechanisms, and protocols, chosen according to where communication is directed, what is communicated, or when communication is performed. In this article, we describe a software architecture that addresses this requirement. This architecture allows multiple communication methods to be supported transparently in a single application, with either automatic or user-specified selection criteria guiding the methods used for each communication. We describe an implementation of this architecture, based on the Nexus communication library, and use this implementation to evaluate performance issues. The implementation supported a wide variety of applications in the I-WAY metacomputing experiment at Supercomputing 95; we use one of these applications to provide a quantitative demonstration of the advantages of multimethod communication in a heterogeneous networked environment.

Foster, I.; Geisler, J.; Tuecke, S. [Argonne National Lab., IL (United States); Kesselman, C. [California Inst. of Tech., Pasadena, CA (United States)

1996-12-31

197

High-data-rate ultrasonic through-metal communication.  

PubMed

A link-adaptive frequency division multiplexing (OFDM) ultrasonic physical layer is proposed for high-data-rate communications through metal walls. The ultrasonic link allows for communication without physical penetration of the metal barrier. Link-adaptive OFDM mitigates the severe frequency- selective fading of the ultrasonic channel and greatly improves throughput over impulse or narrowband communication systems. Throughput improvements of 300% are demonstrated over current narrowband low-frequency techniques, and show improved spectral efficiency over high-frequency techniques found in the literature. PMID:23007780

Wanuga, Kevin; Bielinski, Magda; Primerano, Richard; Kam, Moshe; Dandekar, Kapil R

2012-09-01

198

Short communications published online in the British Journal of Oral and Maxillofacial Surgery during 2010-2011.  

PubMed

The British Journal of Oral and Maxillofacial Surgery (BJOMS) publishes many types of papers including original articles, review articles, and short communications. Many of the latter are isolated case reports of rare or interesting diseases or of difficult or unexpected complications. While case reports are sometimes considered to be of little educational or clinical value, and as such do little to advance medical knowledge, they do have an important role, and many trainees begin their publishing careers writing such papers. There is increasing pressure for space in paper medical journals and, for this reason, some journals either limit or do not publish short publications in print copy but instead put them online. Using established criteria, we previously evaluated all 142 short communications published in the BJOMS during 2008-2009 and found that 48% of them had little or no educational value. As a result, the editorial board of BJOMS took the decision to publish most short communications online only. We have now analysed 48 short communications that were published online only during 2010-2011. Most (80%) were single case reports that covered virtually the whole remit of the specialty, and over half (56%) were published by authors based in the UK. While many of these papers did not add important new information to existing knowledge, these types of article are clearly of value both for trainees and for experienced surgeons. We think that these should continue to be supported as, in addition to their educational value, they are an excellent way for trainees to start to write. PMID:22621907

Colbert, S; Southorn, B; Rosenbaum, G; Aldridge, T; Brennan, P A

2012-09-01

199

High speed laser communication network for satellite systems  

NASA Astrophysics Data System (ADS)

Using optical links in space and building high speed laser communications network has proven to be an extremely complicated task and many such schemes were tried without success in the past. However, in the last few years, there has been impressive progress made to bring the concept to fruition in civilian and government-non classified projects. In this paper we will focus on the requirements of the space-based lasers and optics used for beam forming, as well as receiver antenna gain and detectors used in free space communications. High data rate, small antenna size, narrow beam divergence, and a narrow field of view are characteristics of laser communications that offer a number of potential advantages for system design. Space-based optical communications using satellites in low earth orbit (LEO) and Geo-synchronous orbits (GEO) hold great promise for the proposed Internet in the Sky network of the future. Also discussed are the critical parameters in the transmitter, channel, receiver, and link budget that are employed in successful inter-satellite communications system. We cover that Laser Communications offer a viable alternative to established RF communications for inter-satellite links and other applications where high performance links are a necessity.

Panahi, Allen; Kazemi, Alex A.

2011-06-01

200

Optical communication demonstration and high-rate link facility  

NASA Astrophysics Data System (ADS)

Motivated by demands for faster, better, cheaper spacecraft, NASA is developing deep-space optical communication technology which promises reduced mass, volume, and power consumption compared to radio-frequency technology. While earth-orbiting optical receivers may eventually be employed, initial deep-space optical communication links are expected to utilize terrestrial telescope receivers. As the communication beam passes through the atmosphere, atmospheric turbulence causes the beam to scintillate, dramatically impacting its temporal and transverse nature. The statistics of these effects must be measured extensively if optical deep-space communication links are to be fully modeled and the design of deep-space communication links optimized. Sponsored by the Engineering Research and Technology Development program, the purposes of the Optical Communication Demonstration and High-Rate Link Facility are to demonstrate a Gbps-class optical downlink, gather extensive link statistics, and provide high-rate downlink capability. The Optical Communication Demonstration and High-Rate Link Facility will be deployed to the International Space Station by flight UF-4, currently scheduled for May 2002.

Sandusky, John; Jeganathan, Muthu; Ortiz, Gerry; Biswas, Abi; Lee, Shinhak; Wilson, Keith; Parker, George; Lesh, James

1999-01-01

201

Communication.  

ERIC Educational Resources Information Center

The following essays on communication are presented: communication as a condition of survival, communication for special purposes, the means of transmission of communication, communication within social and economic structures, the teaching of communication through the press, the teaching of modern languages, communication as a point of departure,

Strauss, Andre

202

NASA satellite communications application research. Phase 2: Efficient high power, solid state amplifier for EFH communications  

NASA Technical Reports Server (NTRS)

The final report describes the work performed from 9 Jun. 1992 to 31 Jul. 1993 on the NASA Satellite Communications Application Research (SCAR) Phase 2 program, Efficient High Power, Solid State Amplifier for EHF Communications. The purpose of the program was to demonstrate the feasibility of high-efficiency, high-power, EHF solid state amplifiers that are smaller, lighter, more efficient, and less costly than existing traveling wave tube (TWT) amplifiers by combining the output power from up to several hundred solid state amplifiers using a unique orthomode spatial power combiner (OSPC).

Benet, James

1993-01-01

203

An investigation of high performance, short thrust augmenting ejectors  

NASA Astrophysics Data System (ADS)

The design of air-to-air, thrust augmenting ejectors having short curved wall diffusers utilizing boundary layer control is discussed. The design is achieved by an inverse method which uses the vorticity at the diffuser inlet as a flow parameter in the analysis. Three diffusers having ejector length-to-mixing chamber diameter ratios of approximately 6:1 and mixing chamber inlet area-to-primary nozzle area ratios of 20:1 and 40:1 were designed and tested. A new high level of performance was analytically predicted and achieved experimentally. Comparisons between predicted and observed performances, velocity distributions and pressure distributions are presented.

Yang, T.; Jiang, T.; Pitts, D. R.; Ntone, F.

1984-12-01

204

High charge short electron bunches for wakefield accelerator structures development.  

SciTech Connect

The Argonne Wakefield Accelerator group develops accelerating structures based on dielectric loaded waveguides. We use high charge short electron bunches to excite wakefields in dielectric loaded structures, and a second (low charge) beam to probe the wakefields left behind by the drive beam. We report measurements of beam parameters and also initial results of the dielectric loaded accelerating structures. We have studied acceleration of the probe beam in these structures and we have also made measurements on the RF pulses that are generated by the drive beam. Single drive bunches, as well as multiple bunches separated by an integer number of RF periods have been used to generate the accelerating wakefields.

Conde, M. E.

1998-09-25

205

Analysis of High Power IGBT Short Circuit Failures  

SciTech Connect

The Next Linear Collider (NLC) accelerator proposal at SLAC requires a highly efficient and reliable, low cost, pulsed-power modulator to drive the klystrons. A solid-state induction modulator has been developed at SLAC to power the klystrons; this modulator uses commercial high voltage and high current Insulated Gate Bipolar Transistor (IGBT) modules. Testing of these IGBT modules under pulsed conditions was very successful; however, the IGBTs failed when tests were performed into a low inductance short circuit. The internal electrical connections of a commercial IGBT module have been analyzed to extract self and mutual partial inductances for the main current paths as well as for the gate structure. The IGBT module, together with the partial inductances, has been modeled using PSpice. Predictions for electrical paths that carry the highest current correlate with the sites of failed die under short circuit tests. A similar analysis has been carried out for a SLAC proposal for an IGBT module layout. This paper discusses the mathematical model of the IGBT module geometry and presents simulation results.

Pappas, G.

2005-02-11

206

Photoemission spectroscopy with high-intensity short-wavelength lasers  

E-print Network

We theoretically study the process of photoelectron emission of the Helium atom by a high-intensity short-wavelength laser at a resonance condition of the residual singly charged ion. Photoionization followed by strong resonance coupling in the ion leads to a change in the photoelectron spectrum due to Rabi oscillations in the residual ion. Similarly to resonance fluorescence at high laser intensity, the photoelectron spectrum at high intensities evolves into a multi-peaked structure. The number of peaks in the photoelectron spectrum is related to the number of Rabi cycles following the photoionization process. Moreover, the strong laser-induced coupling to nonresonant states of the residual ion have an imprint on the photoelectron spectrum, leading to additional, isolated peaks at the lower or higher energy sides. The effect should be observable at current seeded XUV free-electron lasers and persists after volume integration in a realistic experimental geometry.

Zhang, Song Bin

2014-01-01

207

A lightweight, high performance communication protocol for grid computing  

Microsoft Academic Search

This paper describes a lightweight, high-performance communication protocol for the high- bandwidth, high-delay networks typical of computational Grids. One unique feature of this protocol is that it incorporates an extremely accurate classification mechanism that is efficient enough to diagnose the cause of data loss in real time, providing to the controller the opportunity to respond to different causes of data

Phillip M. Dickens

2010-01-01

208

Protocol Compilation: High-Performance Communication for Parallel Programs  

Microsoft Academic Search

Protocol Compilation:High-Performance Communication for Parallel Programsby Edward W. FeltenCo-Chairpersons of Supervisory Committee: Professor John ZahorjanProfessor Edward D. LazowskaDepartment of Computer Scienceand EngineeringOne obstacle to the use of distributed-memory multicomputers has been the disappointingperformance of communication primitives. Although the hardware is capableof moving data very quickly, the software has been unable to exploit this potential.The main ...

Edward W. Felten

1993-01-01

209

Short and long-term effectiveness of two communication training modalities with distressed couples  

Microsoft Academic Search

Communication training is a widely practiced therapeutic approach for the treatment of marital discord. Although there is some empirical support for the theoretical assumptions underlying constructive communication patterns, it has not yet been ascertained whether changing these behaviors is sufficient in bringing about stable changes in distressed marriages. The present study was designed to investigate the efficacy of this treatment

Ludwig Schindler; Kurt Hahlweg; Dirk Revenstorf

1983-01-01

210

Short communication: Determination of Salmonella clustered regularly interspaced short palindromic repeats (CRISPR) diversity on dairy farms in Wisconsin and Minnesota.  

PubMed

Salmonella enterica ssp. enterica is a foodborne pathogen able to cause disease in both humans and animals. Diverse serovars of this pathogen exist, some of which are host specific, causing a range of clinical symptoms from asymptomatic infection through morbidity and mortality. According to a 2007 survey by the USDA National Animal Health Monitoring System, fecal shedding of Salmonella from healthy cows occurs on 39.7% of dairy farms in the United States. Certain serovars are frequently isolated from dairy farms and the majority of isolates from the National Animal Health Monitoring System study were represented by 5 serovars; however, genotypic diversity was not examined. The objective of this study was to determine the diversity of clustered regularly interspaced short palindromic repeats (CRISPR) loci in Salmonella collected from 8 dairy farms with a previous history of salmonellosis. None of the cows or calves sampled on 2 of the 8 dairy farms were shedding Salmonella, although Salmonella was detected in a cow bedding sample on 1 of these farms. Salmonella populations were discrete on each farm, according to CRISPR typing, with the exception of an Anatum var. 15+ type on farms 5 and 6 and the Montevideo type on farms 1 and 2. One to 4 distinct CRISPR genotypes were identified per farm. The CRISPR typing differed within serovars, as Montevideo, Anatum var. 15+, and Muenster serovars had no overlap of spacer content, even on the same farm, reflecting between- and within-serovar genetic diversity. The dynamic nature of Salmonella populations was shown in a farm that was sampled longitudinally over 13.5mo. Changes in serovar from 3,19:-:z27 to Montevideo was observed between the first sampling time and 8mo later, with concomitant change in CRISPR alleles. The results indicate that Salmonella strains present in smaller dairy herds (<500 head) are specific to that farm and new Salmonella strains may emerge over time. PMID:25108866

Wehnes, C A; Rehberger, T G; Barrangou, R; Smith, A H

2014-10-01

211

Multiplexed CV quantum teleportation for high rates in quantum communication  

E-print Network

A major challenge of today's quantum communication systems lies in the transmission of quantum information with high rates over long distances in the presence of unavoidable losses. Thereby the achievable quantum communication rate is fundamentally limited by the amount of energy that can be transmitted per use of the channel. It is hence vital to develop quantum communication protocols which encode quantum information as energy efficiently as possible. To this aim we investigate continuous-variable quantum teleportation as a method of distributing quantum information. We explore the possibility to encode information on multiple optical modes and derive upper and lower bounds on the achievable quantum channel capacities. This analysis enables us to benchmark single-mode vs. multi-mode entanglement resources. Our research reveals that multiplexing does not only feature an enhanced energy efficiency, significantly increasing the achievable quantum communication rates in comparison to single-mode coding, but als...

Christ, Andreas; Silberhorn, Christine

2012-01-01

212

Multipoint free-space optics system for short-range communications between flight platforms.  

PubMed

The problems associated with using typical free-space optics (FSO) transceivers for multipoint communications on flight platforms, such as satellites and unmanned aerial vehicles, in a cluster are discussed and the transceivers are found to be unsuitable for concurrent multipoint communications in those platforms. To overcome the problems, a multipoint FSO system design is proposed. The design of the multipoint system is described and the performance of the multipoint receiver is evaluated in terms of receive gain under different conditions. The proposed multipoint system design offers a promising way to implement concurrent multipoint communications on flight platforms with power, weight, and size advantages compared to the use of multiple transceivers. PMID:20062513

Heng, Kiang Huat; Zhong, Wen-De; Cheng, Tee Hiang

2010-01-10

213

High Bandwidth Communications: 2000-2004  

NASA Technical Reports Server (NTRS)

This custom bibliography from the NASA Scientific and Technical Information Program lists a sampling of records found in the NASA Aeronautics and Space Database. The scope of this topic includes optical and high-frequency microwave systems to enhance data transmission rates. This area of focus is one of the enabling technologies as defined by NASA s Report of the President s Commission on Implementation of United States Space Exploration Policy, published in June 2004.

2004-01-01

214

High-energy Emission Components in the Short GRB 090510  

NASA Astrophysics Data System (ADS)

We investigate the origin of the prompt and delayed emission observed in the short GRB 090510. We use the broadband data to test whether the most popular theoretical models for gamma-ray burst emission can accommodate the observations for this burst. We first attempt to explain the soft-to-hard spectral evolution associated with the delayed onset of a GeV tail with the hypothesis that the prompt burst and the high-energy tail both originate from a single process, namely, synchrotron emission from internal shocks (IS). Considerations on the compactness of the source imply that the high-energy tail should be produced in a late-emitted shell, characterized by a Lorentz factor greater than the one generating the prompt burst. However, in this hypothesis, the predicted evolution of the synchrotron peak frequency does not agree with the observed soft-to-hard evolution. Given the difficulties of a single-mechanism hypothesis, we test two alternative double-component scenarios. In the first, the prompt burst is explained as synchrotron radiation from IS and the high-energy emission (up to about 1 s following the trigger) as IS synchrotron-self-Compton. In the second scenario, in view of its long duration (~100 s), the high-energy tail is decoupled from the prompt burst and has an external shock origin. In this case, we show that a reasonable choice of parameters does indeed exist to accommodate the optical-to-GeV data, provided the Lorentz factor of the shocked shell is sufficiently high. Finally, we attempt to explain the chromatic break observed around ~103 s with a structured jet model. We find that this might be a viable explanation and that it lowers the high value of the burst energy derived by assuming isotropy, ~1053 erg, below ~1049 erg, which is more compatible with the energetics from a binary merger progenitor.

Corsi, Alessandra; Guetta, Dafne; Piro, Luigi

2010-09-01

215

Research with high-power short-wavelength lasers  

SciTech Connect

Three important high-temperature, high-density experiments were conducted recently using the 10-TW, short-wavelength Novette laser system at the Lawrence Livermore National Laboratory. These experiments demonstrated successful solutions to problems that arose during previous experiments with long wavelength lasers (lambda greater than or equal to 1..mu..m) in which inertial confinement fusion (ICF), x-ray laser, and other high-temperature physics concepts were being tested. The demonstrations were: (1) large-scale plasmas (typical dimensions of up to 1000 laser wavelengths) were produced in which potentially deleterious laser-plasma instabilities were collisionally damped. (2) Deuterium-tritium fuel was imploded to a density of 20 g/cm/sup 3/ and a pressure of 10/sup 10/ atm. (3) A 700-fold amplification of soft x rays by stimulated emission at 206 and 209 A (62 eV) from Se/sup +24/ ions was observed in a laser-generated plasma. Isoelectronic scaling to 155 A (87 eV) in Y/sup +29/ was also demonstrated.

Holzrichter, J.F.; Campbell, E.M.; Lindl, J.D.; Storm, E.

1985-03-05

216

High efficiency LDMOS power FET for low voltage wireless communications  

Microsoft Academic Search

High efficiency, high gain power transistors are required to meet RF performance and output specifications as new generation portable communication products move towards lower voltage operations. A low cost, high efficiency silicon MOSFET using RFLDMOS (LV2) technology was developed in Motorola to operate at 3.4-12.5 V drain voltages. The LV2 device can deliver 70% power added efficiency with 12 dB

G. Ma; W. Burger; C. Dragon; T. Gillenwater

1996-01-01

217

A high current, short pulse electron source for wakefield accelerators  

SciTech Connect

Design studies for the generation of a high current, short pulse electron source for the Argonne Wakefield Accelerator are presented. An L-band laser photocathode rf gun cavity is designed using the computer code URMEL to maximize the electric field on the cathode surface for fixed frequency and rf input power. A new technique using a curved incoming laser wavefront to minimize the space charge effect near the photocathode is studied. A preaccelerator with large iris to minimize wakefield effects is used to boost the drive beam to a useful energy of around 20 MeV for wakefield acceleration experiments. Focusing in the photocathode gun and the preaccelerator is accomplished with solenoids. Beam dynamics simulations throughout the preaccelerator are performed using particle simulation codes TBCI-SF and PARMELA. An example providing a useful set of operation parameters for the Argonne Wakefield Accelerator is given. The effects of the sagitta of the curved beam and laser amplitude and timing jitter effects are discussed. Measurement results of low rf power level bench tests and a high power test for the gun cavity are presented and discussed.

Ho, Ching-Hung.

1992-01-01

218

A high current, short pulse electron source for wakefield accelerators  

SciTech Connect

Design studies for the generation of a high current, short pulse electron source for the Argonne Wakefield Accelerator are presented. An L-band laser photocathode rf gun cavity is designed using the computer code URMEL to maximize the electric field on the cathode surface for fixed frequency and rf input power. A new technique using a curved incoming laser wavefront to minimize the space charge effect near the photocathode is studied. A preaccelerator with large iris to minimize wakefield effects is used to boost the drive beam to a useful energy of around 20 MeV for wakefield acceleration experiments. Focusing in the photocathode gun and the preaccelerator is accomplished with solenoids. Beam dynamics simulations throughout the preaccelerator are performed using particle simulation codes TBCI-SF and PARMELA. An example providing a useful set of operation parameters for the Argonne Wakefield Accelerator is given. The effects of the sagitta of the curved beam and laser amplitude and timing jitter effects are discussed. Measurement results of low rf power level bench tests and a high power test for the gun cavity are presented and discussed.

Ho, Ching-Hung

1992-12-31

219

German deaf people using text communication: short message service, TTY, relay services, fax, and e-mail.  

PubMed

An online survey of German deaf people demonstrated that they use text communication through Short Message Service (SMS), e-mail, fax, and telephone typewriters (TTY) to communicate within communities of deaf and hearing people. SMS is used most, with more than 96% of respondents having access to a mobile phone. Most use is intrinsic and directed toward sociability (keeping in contact, and making arrangements with friends and family). However, there is some instrumental use (getting tasks or business accomplished, making appointments, and obtaining information). German survey respondents wanted a better relay service, more connectivity among the various technologies, and full interactivity in making calls by any technology. In comparison with an Australian sample, German deaf people could not rely on extensive relay services connecting people with a TTY to hearing telephone subscribers for calls of either a social or business nature. PMID:18018671

Power, Des; Power, Mary R; Rehling, Bernd

2007-01-01

220

Scientific Recognition and Communication Behavior in High Energy Physics.  

ERIC Educational Resources Information Center

The study is concerned with scientific (i.e., professional) recognition and communication behavior in theoretical high energy physics. The sample consists of 977 respondents working in thirty-eight countries. The conferral of two components of professional recognition, research leadership and advisorship, as they are affected by geopolitical and

Zeltman, Gerald

221

Communications: Nanomagnetic shielding: High-resolution NMR in carbon allotropes  

E-print Network

Communications: Nanomagnetic shielding: High-resolution NMR in carbon allotropes Y. Kim,1,a E. Abou report the largest diamagnetic shifts down to 68.3 ppm ever observed in carbon allotropes, which of the magnetic properties of carbon-based materials is of fundamental relevance in applications in nano

Zettl, Alex

222

High School Agricultural Communications Competencies: A National Delphi Study.  

ERIC Educational Resources Information Center

In a three-round Delphi study, agriscience faculty (n=75, 43, 41) refined and categorized competencies in 11 topic areas for a high school agricultural communications course. Appropriate topics and competencies for beginning and intermediate levels were identified. (Contains 12 references.) (SK)

Akers, Cindy L.; Vaughn, Paul R.; Haygood, Jacqui D.

2003-01-01

223

Iridium: Global OTH data communications for high altitude scientific ballooning  

Microsoft Academic Search

While the scientific community is no stranger to embracing commercially available technologies, the growth and availability of truly affordable cutting edge technologies is opening the door to an entirely new means of global communications. For many years high altitude ballooning has provided science an alternative to costly satellite based experimental platforms. As with any project, evolution becomes an integral part

A. Denney

2004-01-01

224

System and method that suppresses intensity fluctuations for free space high-speed optical communication  

DOEpatents

A high-speed (Gbps), free space optical communication system is based on spectral encoding of radiation from a wide band light source, such as a laser. By using partially coherent laser beams in combination with a relatively slow photosensor, scintillations can be suppressed by orders of magnitude for distances of more than 10 km. To suppress the intensity fluctuations due to atmospheric turbulence, a source with partial transverse coherence in combination with slow response time photodetector is used. Information is encoded in the spectral domain of a wideband optical source by modulation of spectral amplitudes. A non-coherent light source with wide spectrum (an LED, for example) may be used for high-speed communication over short (less than about a mile) distances.

Berman, Gennady P. (Los Alamos, NM); Bishop, Alan R. (Los Alamos, NM); Nguyen, Dinh C. (Los Alamos, NM); Chernobrod, Boris M. (Santa Fe, NM); Gorshkov, Vacheslav N. (Kiev, UA)

2009-10-13

225

Performance simulation in high altitude platforms (HAPs) communications systems  

NASA Astrophysics Data System (ADS)

This paper considers the analysis by simulation of a digital narrowband communication system for an scenario which consists of a High-Altitude aeronautical Platform (HAP) and fixed/mobile terrestrial transceivers. The aeronautical channel is modelled considering geometrical (angle of elevation vs. horizontal distance of the terrestrial reflectors) and statistical arguments and under these circumstances a serial concatenated coded digital transmission is analysed for several hypothesis related to radio-electric coverage areas. The results indicate a good feasibility for the communication system proposed and analysed.

Ulloa-Vsquez, Fernando; Delgado-Penin, J. A.

2002-07-01

226

A secure communications infrastructure for high-performance distributed computing  

SciTech Connect

Applications that use high-speed networks to connect geographically distributed supercomputers, databases, and scientific instruments may operate over open networks and access valuable resources. Hence, they can require mechanisms for ensuring integrity and confidentially of communications and for authenticating both users and resources. Security solutions developed for traditional client-server applications do not provide direct support for the program structures, programming tools, and performance requirements encountered in these applications. The authors address these requirements via a security-enhanced version of the Nexus communication library; which they use to provide secure versions of parallel libraries and languages, including the Message Passing Interface. These tools permit a fine degree of control over what, where, and when security mechanisms are applied. In particular, a single application can mix secure and nonsecure communication, allowing the programmer to make fine-grained security/performance tradeoffs. The authors present performance results that quantify the performance of their infrastructure.

Foster, I.; Koenig, G.; Tuecke, S. [and others

1997-08-01

227

SLIM, Short-pulse Technology for High Gradient Induction Accelerators  

SciTech Connect

A novel short-pulse concept (SLIM) suited to a new generation of a high gradient induction particle accelerators is described herein. It applies advanced solid state semiconductor technology and modern microfabrication techniques to a coreless induction method of charged particle acceleration first proven on a macro scale in the 1960's. Because this approach avoids use of magnetic materials there is the prospect of such an accelerator working efficiently with accelerating pulses in the nanosecond range and, potentially, at megahertz pulse rates. The principal accelerator section is envisioned as a stack of coreless induction cells, the only active element within each being a single, extremely fast (subnanosecond) solid state opening switch: a Drift Step Recovery Diode (DSRD). Each coreless induction cell incorporates an electromagnetic pulse compressor in which inductive energy developed within a transmission-line feed structure over a period of tens of nanoseconds is diverted to the acceleration of the passing charge packet for a few nanoseconds by the abrupt opening of the DSRD switch. The duration of this accelerating output pulse--typically two-to-four nanoseconds--is precisely determined by a microfabricated pulse forming line connected to the cell. Because the accelerating pulse is only nanoseconds in duration, longitudinal accelerating gradients approaching 100 MeV per meter are believed to be achievable without inciting breakdown. Further benefits of this approach are that, (1) only a low voltage power supply is required to produce the high accelerating gradient, and, (2) since the DSRD switch is normally closed, voltage stress is limited to a few nanoseconds per period, hence the susceptibility to hostile environment conditions such as ionizing radiation, mismatch (e.g. in medical applications the peak beam current may be low), strong electromagnetic noise levels, etc is expected to be minimal. Finally, we observe the SLIM concept is not limited to linac applications; for instance, it could be employed to both accelerate the beam and to stabilize the superbunch mode of operation in circular track machines.

Arntz, Floyd; /Diversified Tech., Bedford; Kardo-Sysoev, A.; /Ioffe Phys. Tech. Inst.; Krasnykh, A.; /SLAC

2008-12-16

228

Photonics and other approaches to high speed communications  

NASA Technical Reports Server (NTRS)

Our research group of 4 faculty and about 10-15 graduate students was actively involved (as a group) in the development of computer communication networks for the last five years. Many of its individuals have been involved in related research for a much longer period. The overall research goal is to extend network performance to higher data rates, to improve protocol performance at most ISO layers and to improve network operational performance. We briefly state our research goals, then discuss the research accomplishments and direct your attention to attached and/or published papers which cover the following topics: scalable parallel communications; high performance interconnection between high data rate networks; and a simple, effective media access protocol system for integrated, high data rate networks.

Maly, Kurt

1992-01-01

229

Short Communication Molecular dating of the diversification of Phyllostominae bats based on nuclear  

E-print Network

Short Paper Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern, CO 80309, USA a b s t r a c ta r t i c l e i n f o Article history: Received 14 March 2008 Available online 12 November 2008 Keywords: Tebenkof Glacier Alaska First Millennium AD Little Ice Age Holocene

Baker, Robert J.

230

Polarized short odor-trail recruitment communication by a stingless bee, Trigona spinipes  

Microsoft Academic Search

Polarized odor-trail communication, in which a receiver can orient towards the correct endpoint from within the trail, is documented in relatively few animals and is poorly understood, although such directionality could significantly enhance resource localization. Among animals, stingless bees exhibit the unique behavior of depositing long substrate-borne odor trails that assist the orientation of flying nestmates to a specific three-dimensional

James C. Nieh; Felipe A. L. Contrera; Ryan R. Yoon; Lillian S. Barreto; Vera L. Imperatriz-Fonseca

2004-01-01

231

Solid state laser communications in space (SOLACOS) high data rate satellite communication system verification program  

NASA Astrophysics Data System (ADS)

This paper gives an overview on the current development status of the SOLACOS program and presents the highlights of the program. SOLACOS (Solid State Laser Communications in Space) is the national German program to develop a high performance laser communication system for high data rate transmission between LEO and GEO satellites (Inter Orbit Link, IOL). Two experimental demonstrator terminals are designed and developed in the SOLACOS program. The main development objectives are the Pointing Acquisition and Tracking subsystem (PAT) and the high data rate communication system. All key subsystems and components are straightway developed to be upgraded in follow- on projects to full space qualification. The main design objective for the system is a high degree of modularity which allows to easily upgrade the system with new upcoming technologies. Therefore, all main subsystems are interconnected via fibers to ease replacement of subsystems. The system implements an asymmetric data link with a 650 MBit/s return channel and a 10 MBit/s forward channel. The 650 MBit/s channel is based on a diode pumped Nd:YAG, Integrated Optics Modulator and uses the syncbit transmission scheme. In the syncbit system synchronization information which is necessary to maintain phase lock of the local oscillator of the coherent receiver is transmitted time multiplexed into the data stream. The PAT system comprises two beam detection sensors and three beam steering elements. For initial acquisition and tracking of the remote satellite a high speed CCD camera with an integrated image processing unit, the Acquisition and Tracking Sensor (ATS) is used. In the tacking mode the beam position is sensed via the Fibernutator sensor which is also used to couple the incoming signal into the receiver fiber. Incoming and outgoing beams are routed through the telescopes which are positioned with a 2 axis gimbal mechanism and a high speed beam steering mirror. The PAT system is controlled by a digital signal processor. For beam control advanced PAT algorithms are under development.

Pribil, Klaus; Flemmig, Joerg

1994-09-01

232

High performance computing and communications: FY 1996 implementation plan  

SciTech Connect

The High Performance Computing and Communications (HPCC) Program was formally authorized by passage of the High Performance Computing Act of 1991, signed on December 9, 1991. Twelve federal agencies, in collaboration with scientists and managers from US industry, universities, and research laboratories, have developed the Program to meet the challenges of advancing computing and associated communications technologies and practices. This plan provides a detailed description of the agencies` HPCC implementation plans for FY 1995 and FY 1996. This Implementation Plan contains three additional sections. Section 3 provides an overview of the HPCC Program definition and organization. Section 4 contains a breakdown of the five major components of the HPCC Program, with an emphasis on the overall directions and milestones planned for each one. Section 5 provides a detailed look at HPCC Program activities within each agency.

NONE

1995-05-16

233

A new proposal for high capacity voice cellular communications  

Microsoft Academic Search

Slotted ALOHA is proposed as a multiple access scheme for high capacity voice cellular communications. In real-world conditions of propagation (fading environment), its performance is evaluated, both on mobile-to-base and on base-to-mobile channels. The analysis shows that the proposed system exhibits remarkable performance when compared with fixed-assignment techniques, and that it can perform even better than code division multiple access

M. Zorzi; Silvano Pupolin

1993-01-01

234

Slotted ALOHA for High-Capacity Voice Cellular Communications  

Microsoft Academic Search

Slotted ALOHA is proposed as a multiple access scheme for high capacity voice cellular communications in mobile radio environment. The performance of such a system, in the presence of fading and shadowing, is evaluated for both Mobile-to-Base and Base-to-Mobile links, in terms of number of supported conversations per cell, under some constraints on maximum tolerable delay. The numerical results

Michele Zorzi; Silvano Pupolin

1994-01-01

235

Low Cost Cryocoolers for High Temperature Superconductor Communication Filters  

NASA Technical Reports Server (NTRS)

This final report describes the work performed by a consortium of Industry and Government to develop low cost cryocoolers. The specific application was for low cost commercial based high temperature superconductor communication filters. This program was initiated in January 1995 and resulted in the successful demonstration of an HTS filter dewar cooled by a low cost pulse tube cryocooler. Further development of this cryocooler technology is proceeding through various contracts underway and proposed at this time.

Brown, Davina

1998-01-01

236

Communications  

NASA Technical Reports Server (NTRS)

Communication in its many forms is a critical component for an effective Space Grant Program. Good communication is needed within individual Space Grant College/Consortia, for example between consortium affiliates and the consortium program office. Effective communication between the several programs, NASA Headquarters, and NASA field centers also is required. Further, communication among the above program elements, industry, local and state government, and the public also are necessary for meeting program objectives.

Stouffer, Donald D.

1990-01-01

237

Communications.  

ERIC Educational Resources Information Center

This manual, prepared by a distributive education (DE) class at Delaware State College, was designed for use by DE teacher-coordinators who teach communication skills. Included are lessons, activities, and resource materials relating to the following communication skills: functional speaking, written communication, telephone etiquette, customer

Grandfield, Raymond J., Ed.

238

Short Term Effects of Highly and Mildly Aggressive Video Games  

Microsoft Academic Search

Two experiments were conducted to examine the effects of playing different types of video games on players' short-term affective states. In the first experiment, college student subjects played 11 different video games and rated them on a number of characteristics. From these ratings, two games were selectedfor use in Experiment 2. These games differed only in the level of aggression

Craig A. Anderson; Catherine M. Ford

239

Stagings: Short Scripts for Middle and High School Students.  

ERIC Educational Resources Information Center

Introducing students to the magic of theater and helping them develop dramatic skills, this book presents nine reproducible scripts for short plays (15 to 25 minutes) with characters and story lines that will appeal to young people. The scripts in the book encompass a variety of story types, from adaptations of well-known fairy tales to original

Garner, Joan

240

High-power diode lasers for optical communications applications  

NASA Technical Reports Server (NTRS)

High-power, single-mode, double-heterojunction AlGaAs diode lasers are being developed to meet source requirements for both fiber optic local area network and free space communications systems. An individual device, based on the channeled-substrate-planar (CSP) structure, has yielded single spatial and longitudinal mode outputs of up to 90 mW CW, and has maintained a single spatial mode to 150 mW CW. Phase-locked arrays of closely spaced index-guided lasers have been designed and fabricated with the aim of multiplying the outputs of the individual devices to even higher power levels in a stable, single-lobe, anastigmatic beam. The optical modes of the lasers in such arrays can couple together in such a way that they appear to be emanating from a single source, and can therefore be efficiently coupled into optical communications systems. This paper will review the state of high-power laser technology and discuss the communication system implications of these devices.

Carlin, D. B.; Goldstein, B.; Channin, D. J.

1985-01-01

241

High temperature superconductor analog electronics for millimeter-wavelength communications  

NASA Technical Reports Server (NTRS)

The performance of high temperature superconductor (HTS) passive microwave circuits up to X-band was encouraging when compared to their metallic counterparts. The extremely low surface resistance of HTS films up to about 10 GHz enables a reduction in loss by as much as 100 times compared to copper when both materials are kept at about 77 K. However, a superconductor's surface resistance varies in proportion to the frequency squared. Consequently, the potential benefit of HTS materials to millimeter-wave communications requires careful analysis. A simple ring resonator was used to evaluate microstrip losses at Ka-band. Additional promising components were investigated such as antennas and phase shifters. Prospects for HTS to favorable impact millimeter-wave communications systems are discussed.

Romanofsky, R. R.; Bhasin, K. B.

1991-01-01

242

Emerging applications of high temperature superconductors for space communications  

NASA Technical Reports Server (NTRS)

Proposed space missions require longevity of communications system components, high input power levels, and high speed digital logic devices. The complexity of these missions calls for a high data bandwidth capacity. Incorporation of high temperature superconducting (HTS) thin films into some of these communications system components may provide a means of meeting these requirements. Space applications of superconducting technology has previously been limited by the requirement of cooling to near liquid helium temperatures. Development of HTS materials with transition temperatures above 77 K along with the natural cooling ability of space suggest that space applications may lead the way in the applications of high temperature superconductivity. In order for HTS materials to be incorporated into microwave and millimeter wave devices, the material properties such as electrical conductivity, current density, surface resistivity and others as a function of temperature and frequency must be well characterized and understood. The millimeter wave conductivity and surface resistivity were well characterized, and at 77 K are better than copper. Basic microwave circuits such as ring resonators were used to determine transmission line losses. Higher Q values than those of gold resonator circuits were observed below the transition temperature. Several key HTS circuits including filters, oscillators, phase shifters and phased array antenna feeds are feasible in the near future. For technology to improve further, good quality, large area films must be reproducibly grown on low dielectric constant, low loss microwave substrates.

Heinen, Vernon O.; Bhasin, Kul B.; Long, Kenwyn J.

1990-01-01

243

Short Communication Single nucleotide polymorphisms in candidate genes associated with gastrointestinal nematode infection in goats.  

PubMed

Cytokines are small cell-signaling proteins that play an important role in the immune system, participating in intracellular communication. Four candidate genes of the cytokine family (IL2, IL4, IL13, and IFNG) were selected to identify Single Nucleotide Polymorphisms (SNPs) that might be associated with resistance to gastrointestinal endoparasites in goats. A population of 229 goats, F2 offspring from an F1 intercross was produced by crossing pure Saanen goats, considered as susceptible to gastrointestinal endoparasites, with pure Anglo-Nubian goats, considered resistant. Blood was collected for DNA extraction and fecal samples were also collected for parasite egg count. Polymorphisms were prospected by sequencing animals with extreme phenotype for fecal egg count (FEC) distribution. The association between SNPs and phenotype was determined by using the Fisher exact test with correction for multiple tests. Three of the 10 SNPs were identified as significant (P ? 0.03). They were found in intron 1 of IL2 (ENSBTA00000020883), intron 3 of IL13 (ENSBTA00000015953) and exon 3 of IFNG (ENSBTA00000012529), suggesting an association between them and gastrointestinal endoparasite resistance. Further studies will help describe the effects of these markers accurately before implementing them in marker assisted selection. This study is the pioneer in describing such associations in goats. PMID:25366747

Bressani, F A; Tizioto, P C; Giglioti, R; Meirelles, S L C; Coutinho, R; Benvenuti, C L; Malag-Jr, W; Mudadu, M A; Vieira, L S; Zaros, L G; Carrilho, E; Regitano, L C A

2014-01-01

244

Measurement of endogenous allergens in genetically modified soybeans--short communication.  

PubMed

The measurement of endogenous allergens is required by the European Commission (EC) as part of the compositional analysis for GM products from host plants that are common causes of food allergy, such as soybean (EC Implementing Regulation No. 503/2013). In each case, the EC Implementing Regulation indicates that analysis be conducted on identified allergens as specified in the Organization of Economic Cooperation and Development (OECD) consensus documents on compositional considerations for new plant varieties. This communication discusses the methods available to measure endogenous allergens as well as the endogenous soybean allergens that should be analyzed. It is suggested herein that in conjunction with the 2012 OECD consensus document on soybean, any list of soybean allergens should be based on clinically relevant data among publicly available allergen databases and peer-reviewed scientific publications, and the ability to measure the identified allergen. Based on a detailed analysis of the scientific literature, the following key points are recommended: (1) the acceptance of serum-free, quantitative analytical method data as an alternative to traditional IgE reactivity qualitative or semi-quantitative data for evaluation of endogenous soybean allergen content; (2) eight of the 15 potential allergens listed in the OECD soybean consensus document (Gly m 3, Gly m 4, Gly m Bd28K, Gly m Bd30K, Gly m 5, Gly m 6, Gly m 8, and Kunitz trypsin inhibitor) have both appropriate supporting clinical data and sufficient sequence information to be evaluated in comparative endogenous soybean allergen studies; and (3) the remaining seven proteins (Gly m 1, Gly m 2, unknown 50kDa protein, unknown 39kDa protein, P-22-25, lipoxygenase and lectin) lack sufficient data for clear classification as confirmed allergens and/or available sequence information and should not be currently included in the measurement of endogenous soybean allergens in the compositional analysis for the EU. PMID:24945742

Ladics, Gregory S; Budziszewski, Gregory J; Herman, Rod A; Herouet-Guicheney, Corinne; Joshi, Saurabh; Lipscomb, Elizabeth A; McClain, Scott; Ward, Jason M

2014-10-01

245

A high gain antenna system for airborne satellite communication applications  

NASA Technical Reports Server (NTRS)

A high gain antenna for commercial aviation satellites communication is discussed. Electromagnetic and practical design considerations as well as candidate systems implementation are presented. An evaluation of these implementation schemes is given, resulting in the selection of a simple top mounted aerodynamic phased array antenna with a remotely located beam steering unit. This concept has been developed into a popular product known as the Canadian Marconi Company CMA-2100. A description of the technical details is followed by a summary of results from the first production antennas.

Maritan, M.; Borgford, M.

1990-01-01

246

SHORT COMMUNICATION Shallow genetic divergence indicates a CongoNile riverine  

E-print Network

-locality specimen from sub-Saharan Africa. Samples from Camer- oon (West Africa), the Mediterranean and Nile River is highly disjunct (Fig. 1) and is composed of three regions: 1) coastal west Africa from Namibia through

Shaffer, H. Bradley

247

High power microwave components for space communications satellite  

NASA Technical Reports Server (NTRS)

Analyzed, developed, and tested were high power microwave components for communications satellites systems. Included were waveguide and flange configurations with venting, a harmonic filter, forward and reverse power monitors, electrical fault sensors, and a diplexer for two channel simultaneous transmission. The assembly of 8.36 GHz components was bench tested, and then operated for 60 hours at 3.5 kW CW in a high vacuum. The diplexer was omitted from this test pending a modification of its end irises. An RF leakage test showed only that care is required at flange junctions; all other components were RF tight. Designs were extrapolated for 12 GHz and 2.64 GHz high power satellite systems.

Jankowski, H.; Geia, A.

1972-01-01

248

Radio Synthesis Imaging - A High Performance Computing and Communications Project  

NASA Astrophysics Data System (ADS)

The National Science Foundation has funded a five-year High Performance Computing and Communications project at the National Center for Supercomputing Applications (NCSA) for the direct implementation of several of the computing recommendations of the Astronomy and Astrophysics Survey Committee (the "Bahcall report"). This paper is a summary of the project goals and a progress report. The project will implement a prototype of the next generation of astronomical telescope systems - remotely located telescopes connected by high-speed networks to very high performance, scalable architecture computers and on-line data archives, which are accessed by astronomers over Gbit/sec networks. Specifically, a data link has been installed between the BIMA millimeter-wave synthesis array at Hat Creek, California and NCSA at Urbana, Illinois for real-time transmission of data to NCSA. Data are automatically archived, and may be browsed and retrieved by astronomers using the NCSA Mosaic software. In addition, an on-line digital library of processed images will be established. BIMA data will be processed on a very high performance distributed computing system, with I/O, user interface, and most of the software system running on the NCSA Convex C3880 supercomputer or Silicon Graphics Onyx workstations connected by HiPPI to the high performance, massively parallel Thinking Machines Corporation CM-5. The very computationally intensive algorithms for calibration and imaging of radio synthesis array observations will be optimized for the CM-5 and new algorithms which utilize the massively parallel architecture will be developed. Code running simultaneously on the distributed computers will communicate using the Data Transport Mechanism developed by NCSA. The project will also use the BLANCA Gbit/s testbed network between Urbana and Madison, Wisconsin to connect an Onyx workstation in the University of Wisconsin Astronomy Department to the NCSA CM-5, for development of long-distance distributed computing. Finally, the project is developing 2D and 3D visualization software as part of the international AIPS++ project. This research and development project is being carried out by a team of experts in radio astronomy, algorithm development for massively parallel architectures, high-speed networking, database management, and Thinking Machines Corporation personnel. The development of this complete software, distributed computing, and data archive and library solution to the radio astronomy computing problem will advance our expertise in high performance computing and communications technology and the application of these techniques to astronomical data processing.

Crutcher, Richard M.

249

High frequency sound attenuation in short flow ducts  

NASA Technical Reports Server (NTRS)

A geometrical acoustics approach is proposed as a practical design tool for absorbent liners in such short flow ducts as may be found in turbofan engine nacelles. As an example, a detailed methodology is presented for three different types of sources in a parallel plate duct containing uniform ambient flow. A plane wave whose wavefronts are not normal to the duct walls, an arbitrarily located point source, and a spatially harmonic line source are each considered. Optimal wall admittance distributions are found, and it is shown how to estimate the insertion loss for any admittance distribution. The extension of the methodology to realistic source distributions in variable area cylindrical or annular ducts containing arbitrary flow is shown to be conceptually straightforward and computationally practical on a vector-hardware digital computer.

Posey, J. W.

1978-01-01

250

SHORT COMMUNICATION Effects of parity and age on female attraction to faces of infants  

E-print Network

studies have shown that female children and adolescents find pictures of infant faces highly attrac- tive. Attention and preferences for images were measured by gaze duration and other picture- directed behaviors macaque Introduction Sex differences in attention toward infants have been reported in many species

Maestripieri, Dario

251

Amer J of Potato Res (2001) 78:319-322 319 Short Communication  

E-print Network

was associated both with extremely low (e.g., MSG274-3) and high (e.g., MSE202- 3Rus) foliar susceptibility-1,MSE228-11,MSE230-6,MSE246-5,MSF099-3,MSF373- 8, MSG007-1, MSG050-2, MSG227-2, and MSG274-3 were pro

Douches, David S.

252

390 SHORT COMMUNICATIONS PIPER, W. H., AND R. H. WILEY. 1991. Effects of lap-  

E-print Network

on wintering White-throated Sparrows and the usefulness of wing chord as a criterion for sexing. Journal. NOLAN3, PIERRE JOUVENTIN4, F. STEPHEN DOBSON3, RICHARD E. AUSTIC5, REBECCA J. SAFRAN6, LYNN M plumages. We used high-performance liquid chromatography to analyze carotenoids and melanins present

Safran, Rebecca

253

Short communication Effective purification of succinic acid from fermentation broth produced by Mannheimia succiniciproducens  

Microsoft Academic Search

The present studydeals with thedevelopmentof purificationand separation processes required toproduce thehighlypurified succinicacid from the fermentation broth produced by recombinant microorganism, Mannheimia succiniciproducens. The newly developed process consists of the pretreatment process such as reactive extraction and vacuum distillation step and the crystallization process for the highly purified succinic acid production. By-produced acids were effectively removed by the reactive extraction as

Yun Suk Huh; Young-Si Jun; Yeon Ki Hong; Hyohak Song; Sang Yup Lee; Won Hi Hong

254

Short communication Dynamics of early wolf and cougar eradication efforts in  

E-print Network

) and cougars (Puma concolor) to an eradication program. Number of payments for wolves declined from a high; Puma concolor; Wolves 1. Introduction Once two of the most widely distributed large carni- vores in the world, wolves (Canis lupus) and cougars (Puma concolor), were nearly eradicated in the western US

Riley, Shawn J.

255

Short communication Elevated atmospheric CO2 concentration and temperature across an urban-rural transect  

Microsoft Academic Search

The heat island effect and the high use of fossil fuels in large city centers are well documented, but by how much fossil fuel consumption is elevating atmospheric CO2 concentrations and whether elevations in both atmospheric CO2 and air temperature from rural to urban areas are consistently different from year to year are less well known. Our aim was to

K. George; L. H. Ziska; B. Quebedeaux

256

Carcinogenesis vol.12 no.l pp.145-149, 1991 SHORT COMMUNICATION  

E-print Network

have studied the metabolism of PHQ by PGS in the presence of arachidonic acid and hydrogen peroxide that have widespread agricultural and industrial usage. Both are commonly used to preserve citrus fruits OPP and NaOPP. At high doses, a variety of acute toxic effects are observed, including hepatic

California at Berkeley, University of

257

Short Communication Construction and use of new cloning vectors for the rapid  

E-print Network

fusion proteins due to its high degree of specificity, its resistance to many protease inhibitors used Abstract We describe the construction and use of two sets of vectors for the over (TEV) protease. The set of pKLD plasmids (pKLD66, 116) directs the synthesis of a recombinant protein

Rayment, Ivan

258

ELSEVIER Wear 181-183 (1995) 810-820 Short Communication  

E-print Network

considerably lower than the other coatings evaluated (Armacor-M, B-60, TS-2, Stellite-6, Hastelloy-22, high Cr) Hastelloy-22 (57.1%Ni-21%Cr-23%Mo-2.95%W-O.OO6%C-5.15%Fe) (2) Inconel-625 (61.7%Ni-21.7%Cr-G3.5%Mo-3.49%(Nb

DuPont, John N.

259

Short communication: genetic evaluation of stillbirth in US Brown Swiss and Jersey cattle.  

PubMed

Stillbirth (SB) often results in reduced milk yield, compromised reproductive performance, and decreased dam longevity. Corrective mating can be used as a short-term solution to the problem, but long-term improvement of the population requires the routine calculation of genetic evaluations. Breeding values for SB have been available for Holstein (HO) bulls since 2006, but not for Brown Swiss (BS) or Jersey (JE) bulls. In this study, a multi-breed sire-maternal grandsire threshold model was used to perform genetic evaluations for SB of BS, JE, and HO bulls using more than 14 million purebred and crossbred calving records. Phenotypically, the percentage of SB (%SB) across all lactations were 3.7% in JE, 5.1% in BS, and 6.3% in HO. Direct heritabilities for BS, JE, and HO were 0.008, 0.007, and 0.008, and maternal heritabilities were 0.002, 0.016, and 0.021, respectively. Compared with HO, crossbred calvings from BS and JE bulls bred to HO cows lowered %SB by 1.5 and 1.2%, respectively. In general, %SB increased considerably as calving difficulty increased in all 3 breeds; however, in JE, %SB was constant for dystocia scores of 3 (needed assistance), 4 (considerable force), and 5 (extreme difficulty). Compared with purebred HO calvings, purebred BS and JE calvings had lower phenotypic %SB by up to 5.5 and 7.8%, respectively, and BS HO and JE HO crossbred calvings decreased %SB by up to 3.8 and 4.1%, respectively. As expected, SB rates in primiparous cows were higher than those in multiparous cows. Female calves had greater %SB than male calves in all parities for JE and in second-and-later parities for BS. Favorable (decreasing) phenotypic and genetic trends from 1999 to 2009 were observed in all 3 breeds. Heterosis of SB for BS and JE was -0.026 and -0.149, respectively, on the underlying scale, which corresponds to effects on service-sire SB (SSB) and daughter SB (DSB) predicted transmitting ability (PTA) of -0.3 and -0.5% in BS, and -1.5 and -2.7% in JE. Overall, in the current population, BS bulls had the most desirable average SSB PTA of 4.8%, compared with 5.6% for JE and 5.5% for HO. Brown Swiss and JE bulls both had average DSB PTA of 6.5%, lower than that of 7.7% in HO. Average reliabilities of SSB and DSB in 3 breeds ranged from 45 to 50%. The use of a BS-JE-HO multibreed genetic evaluation for SB in the United States is feasible, and the addition of SSB and DSB to the lifetime net merit selection index will help improve the profitability of BS and JE cattle in the United States. PMID:24508434

Yao, C; Weigel, K A; Cole, J B

2014-04-01

260

Short communication: cheminformatics analysis to identify predictors of antiviral drug penetration into the female genital tract.  

PubMed

Abstract The exposure of oral antiretroviral (ARV) drugs in the female genital tract (FGT) is variable and almost unpredictable. Identifying an efficient method to find compounds with high tissue penetration would streamline the development of regimens for both HIV preexposure prophylaxis and viral reservoir targeting. Here we describe the cheminformatics investigation of diverse drugs with known FGT penetration using cluster analysis and quantitative structure-activity relationships (QSAR) modeling. A literature search over the 1950-2012 period identified 58 compounds (including 21 ARVs and representing 13 drug classes) associated with their actual concentration data for cervical or vaginal tissue, or cervicovaginal fluid. Cluster analysis revealed significant trends in the penetrative ability for certain chemotypes. QSAR models to predict genital tract concentrations normalized to blood plasma concentrations were developed with two machine learning techniques utilizing drugs' molecular descriptors and pharmacokinetic parameters as inputs. The QSAR model with the highest predictive accuracy had R(2)test=0.47. High volume of distribution, high MRP1 substrate probability, and low MRP4 substrate probability were associated with FGT concentrations ?1.5-fold plasma concentrations. However, due to the limited FGT data available, prediction performances of all models were low. Despite this limitation, we were able to support our findings by correctly predicting the penetration class of rilpivirine and dolutegravir. With more data to enrich the models, we believe these methods could potentially enhance the current approach of clinical testing. PMID:24512359

Thompson, Corbin G; Sedykh, Alexander; Nicol, Melanie R; Muratov, Eugene; Fourches, Denis; Tropsha, Alexander; Kashuba, Angela D M

2014-11-01

261

2-D Simulations of Orientation in Highly Concentrated Short Glass Fiber Thermoplastic Composites Made by Injection Molding  

E-print Network

2-D Simulations of Orientation in Highly Concentrated Short Glass Fiber Thermoplastic Composites microscopy. Introduction Injection molded, short-glass fiber thermoplastic composites are an attractive

Wapperom, Peter

262

High-dimensional modulation for coherent optical communications systems.  

PubMed

In this paper, we examine the performance of several modulation formats in more than four dimensions for coherent optical communications systems. We compare two high-dimensional modulation design methodologies based on spherical cutting of lattices and block coding of a 'base constellation' of binary phase shift keying (BPSK) on each dimension. The performances of modulation formats generated with these methodologies is analyzed in the asymptotic signal-to-noise ratio regime and for an additive white Gaussian noise (AWGN) channel. We then study the application of both types of high-dimensional modulation formats to standard single-mode fiber (SSMF) transmission systems. For modulation with spectral efficiencies comparable to dual-polarization (DP-) BPSK, polarization-switched quaternary phase shift keying (PS-QPSK) and DP-QPSK, we demonstrate SNR gains of up to 3 dB, 0.9 dB and 1 dB respectively, at a BER of 10(-3). PMID:24718249

Millar, David S; Koike-Akino, Toshiaki; Ar?k, Sercan ; Kojima, Keisuke; Parsons, Kieran; Yoshida, Tsuyoshi; Sugihara, Takashi

2014-04-01

263

Short communication: effect of postgrazing residual pasture height on milk production.  

PubMed

In grazing systems, dry matter intake (DMI) and milk production have been reported to increase with increasing pasture allowance (PA). This has often led to greater postgrazing residual heights being associated with a well-fed cow. However, in previous studies pastures were often managed to be homogeneous pretreatment, confounding the effect of postgrazing height and PA because high PA led to high postgrazing height. The objective of this study was to determine whether postgrazing height affects milk production if cows are offered the same PA. Before the study, perennial ryegrass (Lolium perenne L.) dominant pastures were randomly allocated to 1 of 3 grazing treatments and defoliated to 4.1 +/- 0.3 (low), 5.1 +/- 0.3 (medium), or 5.9 +/- 0.3 (high) cm compressed postgrazing residual pasture height. When a minimum of 2 new leaves had emerged on the majority of ryegrass tillers, 30 multiparous dairy cows were randomly assigned to 1 of the 3 treatments and grazed their respective pastures over a 10-d period. Cows were offered a similar PA above the preexperimental postgrazing residual (17.1 +/- 2.9 kg of dry matter/cow per d). Pasture disappearance per daily grazing area (estimated DMI) was similar across treatments (14.8 kg of dry matter/cow per d). Milk yield was negatively correlated with postgrazing height, but postgrazing height had no effect on milk component yield. Although the reason for this reduction in milk yield remains unclear, data indicate that low postgrazing heights do not adversely affect milk production. PMID:18946136

Lee, J M; Donaghy, D J; Roche, J R

2008-11-01

264

210 SHORT COMMUNICATIONS WILSON, JR., W. H. 1989. Predation and the media-palmated Sandpipers on a Bay of Fundy mud-  

E-print Network

210 SHORT COMMUNICATIONS WILSON, JR., W. H. 1989. Predation and the media- palmated Sandpipers. Influences of cao- turing prey on subsequent search in the Oven- bird (Aves: Parulidae). Can. J. Zool. 55:195 8-1969. The Condor 99:21&213 0 The Cooper Ornithological Society 1997 AQUATIC COMMUNITY

McCarty, John P.

265

Experimental investigation of high performance, short, thrust augmenting ejectors  

NASA Astrophysics Data System (ADS)

Air-to-air thrust augmenting ejectors utilizing short curved wall diffusers were designed and tested. Two of the three ejectors tested have identical mixing chambers with an inlet area to the primary nozzle area ratio lambda of 40. The overall ejector length-to-mixing chamber diameter ratios (L/D) were 6.09 and 6.16; diffuser area ratios were 1.33 and 1.46, respectively. The third ejector had an overall L/D of 6.02, a lambda of 20, and diffuser area ratio of 1.26. The best observed thrust augmentation ratio and the modified thrust augmentation ratio were 2.11 and 1.91 respectively for a sonic primary jet. The modified thrust augmentation ratio accounts for the penalty of suction in preventing flow separation in the diffuser. These levels of thrust ratio were derived from velocity measurements at the ejector exit. Independent thrust measurements obtained with strain gages on the mixing chamber agree with the force calculated from the momentum data. The experimentally observed ejector performance data correlate well with the predicted values.

Yang, T. T.; Ntone, F.; Tong, J.

1983-01-01

266

Advanced communications technology satellite high burst rate link evaluation terminal communication protocol software user's guide, version 1.0  

NASA Technical Reports Server (NTRS)

The Communication Protocol Software was developed at the NASA Lewis Research Center to support the Advanced Communications Technology Satellite High Burst Rate Link Evaluation Terminal (ACTS HBR-LET). The HBR-LET is an experimenters terminal to communicate with the ACTS for various experiments by government, university, and industry agencies. The Communication Protocol Software is one segment of the Control and Performance Monitor (C&PM) Software system of the HBR-LET. The Communication Protocol Software allows users to control and configure the Intermediate Frequency Switch Matrix (IFSM) on board the ACTS to yield a desired path through the spacecraft payload. Besides IFSM control, the C&PM Software System is also responsible for instrument control during HBR-LET experiments, uplink power control of the HBR-LET to demonstrate power augmentation during signal fade events, and data display. The Communication Protocol Software User's Guide, Version 1.0 (NASA CR-189162) outlines the commands and procedures to install and operate the Communication Protocol Software. Configuration files used to control the IFSM, operator commands, and error recovery procedures are discussed. The Communication Protocol Software Maintenance Manual, Version 1.0 (NASA CR-189163, to be published) is a programmer's guide to the Communication Protocol Software. This manual details the current implementation of the software from a technical perspective. Included is an overview of the Communication Protocol Software, computer algorithms, format representations, and computer hardware configuration. The Communication Protocol Software Test Plan (NASA CR-189164, to be published) provides a step-by-step procedure to verify the operation of the software. Included in the Test Plan is command transmission, telemetry reception, error detection, and error recovery procedures.

Reinhart, Richard C.

1993-01-01

267

Whole-Genome Sequencing and Assembly with High-Throughput, Short-Read Technologies  

Microsoft Academic Search

While recently developed short-read sequencing technologies may dramatically reduce the sequencing cost and eventually achieve the $1000 goal for re-sequencing, their limitations prevent the de novo sequencing of eukaryotic genomes with the standard shotgun sequencing protocol. We present SHRAP (SHort Read Assembly Protocol), a sequencing protocol and assembly methodology that utilizes high-throughput short-read technologies. We describe a variation on hierarchical

Andreas Sundquist; Mostafa Ronaghi; Haixu Tang; Pavel Pevzner; Serafim Batzoglou

2007-01-01

268

A self-adaptive method for creating high efficiency communication channels through random scattering media  

NASA Astrophysics Data System (ADS)

Controlling the propagation of electromagnetic waves is important to a broad range of applications. Recent advances in controlling wave propagation in random scattering media have enabled optical focusing and imaging inside random scattering media. In this work, we propose and demonstrate a new method to deliver optical power more efficiently through scattering media. Drastically different from the random matrix characterization approach, our method can rapidly establish high efficiency communication channels using just a few measurements, regardless of the number of optical modes, and provides a practical and robust solution to boost the signal levels in optical or short wave communications. We experimentally demonstrated analog and digital signal transmission through highly scattering media with greatly improved performance. Besides scattering, our method can also reduce the loss of signal due to absorption. Experimentally, we observed that our method forced light to go around absorbers, leading to even higher signal improvement than in the case of purely scattering media. Interestingly, the resulting signal improvement is highly directional, which provides a new means against eavesdropping.

Hao, Xiang; Martin-Rouault, Laure; Cui, Meng

2014-07-01

269

A self-adaptive method for creating high efficiency communication channels through random scattering media.  

PubMed

Controlling the propagation of electromagnetic waves is important to a broad range of applications. Recent advances in controlling wave propagation in random scattering media have enabled optical focusing and imaging inside random scattering media. In this work, we propose and demonstrate a new method to deliver optical power more efficiently through scattering media. Drastically different from the random matrix characterization approach, our method can rapidly establish high efficiency communication channels using just a few measurements, regardless of the number of optical modes, and provides a practical and robust solution to boost the signal levels in optical or short wave communications. We experimentally demonstrated analog and digital signal transmission through highly scattering media with greatly improved performance. Besides scattering, our method can also reduce the loss of signal due to absorption. Experimentally, we observed that our method forced light to go around absorbers, leading to even higher signal improvement than in the case of purely scattering media. Interestingly, the resulting signal improvement is highly directional, which provides a new means against eavesdropping. PMID:25070592

Hao, Xiang; Martin-Rouault, Laure; Cui, Meng

2014-01-01

270

Short communication: Decrease in rumination time as an indicator of the onset of calving.  

PubMed

The aim of this study was to investigate whether rumination time (RT) is affected by the onset of calving. The relationship between both feeding time and dry matter intake (DMI) to the onset of calving was also examined. In addition, the correlation between feeding behavior characteristics, described here as RT, feeding time, and DMI, was evaluated. Under test conditions, the feeding behavior of pregnant Holstein cows was recorded from the time when they were moved into calving pens (usually 7 to 5d prepartum) until the onset of calving. Feeding time and DMI were recorded by automatic feed bins; RT was measured continuously by a measuring halter based on electromyography (DairyCheck; BITSz Engineering GmbH, Zwickau, Germany), which constitutes a new approach regarding feeding behavior detection. Data analysis related to the final 72 h, before the onset of calving, which were divided into twelve 6-h blocks. The last 6h (one 6-h block) before calving were compared with the 72- to 7-h time frame (11 times 6-h blocks) before calving, which was defined as the reference period. For this time period, feeding behavior data for 17 cows was fully available, which was the precondition for data analysis. In the final 6h before imminent birth, RT was significantly reduced. During this time, it was found that the mean minimum RT was 69.9 28.5 min/6h compared with the mean RT of 95.5 30.8 min/6h in the reference period. The average decrease in RT was 27% (25.6 min/6h). In addition, feeding time and DMI were significantly reduced. The average decrease in feeding time was 57% (20.8 min/6h), and in DMI it was 56% (1.9 kg/6h). High correlation coefficients between feeding behavior characteristics were only found between feeding time and DMI. Values of feeding behavior among cows were characterized by high variability. Recording RT can serve as a useful tool for predicting the timing of birth for dairy cows, but further research is necessary. PMID:24612813

Bchel, S; Sundrum, A

2014-05-01

271

Short communication: Fractional milking distribution of immunoglobulin G and other constituents in colostrum.  

PubMed

The provision of quality colostrum with a high concentration of immunoglobulins is critical for newborn calf health. Because first colostrum may be low in overall concentration to effectively reduce the risk of newborn infections, we tested equivalent milking fractions of colostrum for possible IgG differences. The objective of this study was to determine if the fractional composition of colostrum changes during the course of milking with a focus on immunoglobulins. Twenty-four Holstein and Simmental cows were milked (first colostrum) within 4h after calving. The colostrum of 1 gland per animal was assembled into 4 percentage fractions over the course of milking: 0 to 25%, 25 to 50%, 50 to 75%, and 75 to 100%. The IgG concentration among the various fractions did not change in any significant pattern. Concentration of protein, casein, lactose and somatic cell count remained the same or exhibited only minor changes during the course of fractional milking colostrum. We determined that no benefit exists in feeding any particular fraction of colostrum to the newborn. PMID:23810595

Vetter, A; Argello, A; Baumrucker, C; Bruckmaier, R M

2013-09-01

272

Short communication: effect of pomegranate-residue supplement on Cryptosporidium parvum oocyst shedding in neonatal calves.  

PubMed

Cryptosporidium parvum is considered one of the most common enteropathogens, responsible for the high incidence of diarrhea and deleterious implications on immunity and health in neonatal calves. The pomegranate is well known for its health-promoting properties. Two experiments were designed to test the antiparasitical and antidiarrheal effects of concentrated pomegranate extract (CPE) supplement in milk in neonatal Holstein calves. Forty-one calves were randomly divided into control (n=20) and treatment (n=21) groups. For the first experiment, the treatment group was supplemented with 3.75% CPE in the daily milk ration, between 3 and 14 d of age, whereas the control group received only milk. Fecal samples were collected between d 5 and 13 to quantify Cryptosporidium oocysts, and the duration and intensity of diarrhea were evaluated. Reduced fecal oocyst count and diarrhea intensity and duration were revealed in the 3.75% CPE calves. No difference was noted in average daily gain between groups. In a second experiment, which was designed to test the effect of a lower CPE concentration (0.6% of daily milk allocation), no effects on fecal oocyst count and average daily gain were observed. However, compared with control, the lower CPE group was characterized by a shorter duration of diarrhea and higher weight gain among males at 14 d of age. These results suggest that the CPE supplement-to-calf milk ratio may potentially alleviate intestinal morbidity caused by Cryptosporidium. PMID:24952772

Weyl-Feinstein, S; Markovics, A; Eitam, H; Orlov, A; Yishay, M; Agmon, R; Miron, J; Izhaki, I; Shabtay, A

2014-09-01

273

Short communication: Lymphoproliferative response to lipopolysaccharide and incidence of infections in periparturient dairy cows.  

PubMed

This preliminary study aimed at assessing whether the in vitro proliferation of peripheral blood mononuclear cells in response to lipopolysaccharide permits individual characterization of periparturient dairy cows, and whether this parameter may be associated with incidence of infections and with some of the single nucleotide polymorphisms located on the toll-like receptor 4 (TLR4) gene. Based on the average response of peripheral blood mononuclear cells to lipopolysaccharide over 7 time points during the transition period, 31 cows were categorized as low (LO), medium (MED), and high (HI) responders. This categorization identified 7 HI, 19 MED, and 5 LO cows, respectively. Genomic DNA was genotyped for P-226 C>G and E3+2021 C>T TLR4 single nucleotide polymorphisms. Monitoring of the health status revealed that 8 of the 31 cows suffered from clinical mastitis, metritis, or interdigital dermatitis during the first 60d in milk. The association study pointed out that none of the HI cows and all of the LO cows developed an infection; cows with the CCGT haplotype remained healthy and none of them belonged to the LO responder category. PMID:24054285

Catalani, Elisabetta; Amadori, Massimo; Vitali, Andrea; Lacetera, Nicola

2013-11-01

274

Short Communication: Expression Profiles of Endogenous Retroviral Envelopes in Macaca mulatta (Rhesus Monkey).  

PubMed

Abstract Endogenous retroviruses (ERVs), which are footprints of ancient germline infections, were inserted into the genome during the early stages of primate evolution. Human endogenous retroviruses (HERVs) occupy approximately 8% of the human genome. Although most ERV genes are defective, with large deletions, stop codons, and frameshifts in their open reading frames (ORFs), some full-length sequences containing long ORFs are expressed in several tissues and cancers. Several envelope glycoproteins that are encoded by env genes have retained some characteristics of their ancestral infectious viruses. These glycoproteins play essential physiological roles in the organs in which they are expressed. Previous studies have demonstrated the expression of ERV env at the mRNA level in cells and tissues rather than at the protein level, which is more difficult to detect. However, it is not known whether Env is functionally conserved in primates. To understand the possible role of Env in primates, we examined the expression of the env genes of four ERVs (ERV-R, -K, -W, and -FRD) at the protein as well as mRNA levels in various tissues of the rhesus monkey. The ERV env gene products were observed at moderate to high levels in each tissue that was examined and showed tissue-specific expression patterns. Our data suggest a biologically important role for retroviral proteins in healthy tissues of the rhesus monkey. PMID:24961963

Eo, Jungwoo; Cha, Hee-Jae; Imai, Hiroo; Hirai, Hirohisa; Kim, Heui-Soo

2014-10-01

275

Short Communication: New HIV Infections at Southern New England Academic Institutions: Implications for Prevention  

PubMed Central

Abstract New HIV infections among younger men who have sex with men (MSM) in the United States are escalating. Data on HIV infections in college students are limited. In 2010, three MSM college students presented to our clinic with primary HIV infection (PHI) in a single month. To determine the number of college students among new HIV diagnoses, we reviewed clinical characteristics and molecular epidemiology of HIV-diagnosed individuals from January to December 2010 at the largest HIV clinic in Southern New England. PHI was defined as acute HIV infection or seroconversion within the last 6 months. Of 66 individuals diagnosed with HIV in 2010, 62% were MSM and 17% were academic students (12% college or university, 5% other). Seventy-three percent of students were MSM. Compared to nonstudents, students were more likely to be younger (24 versus 39 years), born in the United States (91% versus 56%), have another sexually transmitted disease (45% versus 11%), and present with PHI (73% versus 16%, all p-values<0.05). Thirty percent of individuals formed eight transmission clusters including four students. MSM were more likely to be part of clusters. Department of Health contact tracing of cluster participants allowed further identification of epidemiological linkages. Given these high rates of PHI in recently diagnosed students, institutions of higher education should be aware of acute HIV presentation and the need for rapid diagnosis. Prevention strategies should focus on younger MSM, specifically college-age students who may be at increased risk of HIV infection. PMID:22724920

Kazi, Shahzeb; Rana, Amaad; Blazar, Ilyse; Dejong, Colette C.; Mayer, Kenneth H.; Huard, Thomas K.; Carleton, Kim; Gillani, Fizza; Alexander, Nicole; Parillo, Zoanne; Flanigan, Timothy P.; Kantor, Rami

2013-01-01

276

Short communication: Antimicrobial susceptibility profiling and genotyping of Staphylococcus aureus isolates from bovine mastitis in Poland.  

PubMed

Staphylococcus aureus is the predominant causative agent of bovine mastitis, a disease that remains a major economic burden for the dairy industry worldwide. In this study, the antimicrobial resistance patterns and the genetic composition of 80 S. aureus mastitis isolates collected from 14 dairy farms in Eastern Poland were determined. Of the 10 antimicrobial agents evaluated, only testing for penicillin G produced drug resistance. As 41% of the S. aureus isolates were penicillin resistant, this drug along with other ?-lactamase-sensitive ?-lactams, should rather not be considered for the treatment of bovine mastitis caused by S. aureus. Upon genotyping, with a triplex PCR method, a total of 11 distinct PCR types were produced. The population structure of S. aureus isolates was highly clonal, with 1 predominant genotype circulating on each farm. The observed similarities in the genotype composition of S. aureus populations from geographically distant farms underscore the significance of interfarm transmission of S. aureus in Poland. This, in turn, argues for the establishment of a nationwide surveillance program for bovine mastitis due to this pathogen. PMID:25087034

Jagielski, T; Puacz, E; Lisowski, A; Siedlecki, P; Dudziak, W; Mi?dzobrodzki, J; Krukowski, H

2014-10-01

277

Short communication: Occurrence of aflatoxin M1 in the Manchego cheese supply chain.  

PubMed

The importance of ewe milk lies in the production of high quality cheeses, such as Manchego cheese with a Protected Designation of Origin, whose safety must be guaranteed. In a 2-yr study, 407 bulk tank milk samples from farms and 82 silo milk and curd samples from cheese factories were collected from southeast Spain and tested for aflatoxin M1 (AFM1) using 2 commercial ELISA tests. Of these, 99.3% of the bulk tank samples had AFM1 levels below the European Union (EU) legal limit for milk (50 ng/kg), and well below the limit adopted by the Codex Alimentarius (500 ng/kg). Moreover, 98.8% of the silo milk and curd samples from cheese factories had AFM1 levels below the EU limit for milk. When considering median AFM1 concentrations, an average 4-fold increase was found in the final curd in relation to the corresponding silo milk. Control of AFM1 in Manchega ewe milk would enhance dairy product safety by the possible detection of faults in the manufacture of Manchego cheese. PMID:21605747

Rubio, R; Licn, C C; Berruga, M I; Molina, M P; Molina, A

2011-06-01

278

Short communication: Aflatoxin M? in dairy products sold in ?anl?urfa, Turkey.  

PubMed

The aim of this study was to detect the presence of aflatoxin M? (AFM1) in samples of raw milk (n=38), UHT milk (n=12), white pickled cheese (n=50), and yogurt (n=50) collected from the ?anl?urfa city markets and locally produced dairy products by ELISA. The mean contamination rates were 56.74 40.32, 43.1 23.19, 103.2 29.13, and 55.28 12.68 ng/kg, respectively, for raw milk, UHT milk, white pickled cheese, and yogurt. According to the data, 21 (55%) raw milk, 3 (25%) UHT milk, 10 (20%) white pickled cheese, and 10 (20%) yogurt samples were contaminated with AFM1 over the acceptable levels (?50 ng/kg), ranging from 0.82 to 130.89 ng/kg. None of the white pickled cheese samples contained AFM1 levels above the Turkish legal limit (250 ng/kg). Consequently, the AFM1 contamination levels determined in this study in white pickled cheese were not considered to pose a serious public health hazard. However, the AFM1 levels in raw and UHT milk and yogurt samples indicate an increased human health risk in Turkey related to high aflatoxin levels. Therefore, milk and dairy products have to be monitored by the Turkish public health authorities continuously to detect AFM1 contamination. PMID:24239070

Temamogullari, F; Kanici, A

2014-01-01

279

Short communication: Ability of dogs to detect cows in estrus from sniffing saliva samples.  

PubMed

Efficient estrus detection in high-producing dairy cows is a permanent challenge for successful reproductive performance. In former studies, dogs have been trained to identify estrus-specific odor in vaginal fluid, milk, urine, and blood samples under laboratory conditions with an accuracy of more than 80%. For on-farm utilization of estrus-detection dogs it would be beneficial in terms of hygiene and safety if dogs could identify cows from the feed alley. The objective of this proof of concept study was to test if dogs can be trained to detect estrus-specific scent in saliva of cows. Saliva samples were collected from cows in estrus and diestrus. Thirteen dogs of various breeds and both sexes were trained in this study. Five dogs had no experience in scent detection, whereas 8 dogs had been formerly trained for detection of narcotics or cancer. In the training and test situation, dogs had to detect 1 positive out of 4 samples. Dog training was based on positive reinforcement and dogs were rewarded with a clicker and food for indicating saliva samples of cows in estrus. A false indication was ignored and documented in the test situation. Dogs with and without prior training were trained for 1 and 5 d, respectively. For determining the accuracy of detection, the position of the positive sample was unknown to the dog handler, to avoid hidden cues to the dog. The overall percentage of correct positive indications was 57.6% (175/304), with a range from 40 (1 dog) to 75% (3 dogs). To our knowledge, this is the first indication that dogs are able to detect estrus-specific scent in saliva of cows. PMID:23261382

Fischer-Tenhagen, C; Tenhagen, B-A; Heuwieser, W

2013-02-01

280

Short communication: Characteristics of student success in an undergraduate physiology and anatomy course.  

PubMed

Several factors affect the success of students in college classes. The objective of this research was to determine what factors affect success of undergraduate students in an anatomy and physiology class. Data were collected from 602 students enrolled in the Agriculture and Life Sciences (ALS) 2304 Animal Physiology and Anatomy course from 2005 through 2012. The data set included 476 females (79.1%) and 126 males (20.9%). Time to complete exams was recorded for each student. For statistical analyses, students' majors were animal and poultry sciences (APSC), agricultural sciences, biochemistry, biological sciences, dairy science, and "other," which combined all other majors. All analyses were completed using the GLIMMIX procedure of SAS (SAS Institute Inc., Cary, NC). Gender, major, matriculation year, major by year interaction, gender by year interaction, and time to complete the exam affected final course grade. The significant gender effect was manifested in the final grade percentage of 75.90.4 for female students compared with 72.30.6 for male students. Junior males had final course grades comparable with those of females, but sophomore and senior males had lower final course grades than other combinations. Biology majors had a final grade of 82.40.6 and this grade was greater than all other majors. Students classified as "other" had a final score of 74.40.8, which was greater than agricultural science majors (69.50.9). The APSC grade (72.60.5) was higher than the agricultural science majors. Junior students had significantly greater final grades (76.10.5) than sophomores (73.30.6) and seniors (72.90.9). All biology students had greater final grades than all other majors, but biochemistry juniors had greater final course grades than APSC, agricultural science, and dairy science juniors. "Other" seniors had greater final course grades than agricultural science seniors. The regression for time to complete the exam was curvilinear and suggests that highest exam scores were at about 90-min completion time. It may be that some male students need better preparation for anatomy and physiology and their educational preparation should mimic that of female students more in terms of advance-placement biology in high school. These results suggest that biology majors might be better prepared for animal anatomy and physiology than other students. PMID:25087028

Gwazdauskas, F C; McGilliard, M L; Corl, B A

2014-10-01

281

MILAGRO CONSTRAINTS ON VERY HIGH ENERGY EMISSION FROM SHORT-DURATION GAMMA-RAY BURSTS  

E-print Network

MILAGRO CONSTRAINTS ON VERY HIGH ENERGY EMISSION FROM SHORT-DURATION GAMMA-RAY BURSTS A. A. Abdo,1 localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led-duration (gamma-ray

California at Santa Cruz, University of

282

Low Noise, High Gain Short-Wave Infrared Nano-Injection Photon Detectors with Low Jitter  

E-print Network

Science, Northwestern University, Evanston, IL 60208 We present the near-infrared injection photodetectors in short wave infrared (SWIR) spectrum, particularly focusing at 1.55 m wavelength. Spanning a wide rangeLow Noise, High Gain Short-Wave Infrared Nano-Injection Photon Detectors with Low Jitter Omer

Mohseni, Hooman

283

Why Segregating Short Jobs from Long Jobs under High Variability is Not Always a Win  

E-print Network

Why Segregating Short Jobs from Long Jobs under High Variability is Not Always a Win Mor Harchol assignment policies for server farms as the variability of job sizes (service demands) approaches infinity. The Size-Interval- Task-Assignment policy (SITA), which separates short jobs from long jobs, has long been

Harchol-Balter, Mor

284

Short communication: Prediction of intake in dairy cows under tropical conditions.  

PubMed

A meta-analysis was conducted to develop a model for predicting dry matter intake (DMI) in dairy cows under the tropical conditions of Brazil and to assess its adequacy compared with 5 currently available DMI prediction models: Agricultural and Food Research Council (AFRC); National Research Council (NRC); Cornell Net Carbohydrate and Protein System (CNCPS; version 6); and 2 other Brazilian models. The data set was created using 457 observations (n=1,655 cows) from 100 studies, and it was randomly divided into 2 subsets for statistical analysis. The first subset was used to develop a DMI prediction equation (60 studies; 309 treatment means) and the second subset was used to assess the adequacy of DMI predictive models (40 studies; 148 treatment means). The DMI prediction model proposed in the current study was developed using a nonlinear mixed model analysis after reparameterizing the NRC equation but including study as a random effect in the model. Body weight (mean = 540 57.6 kg), 4% fat-corrected milk (mean = 21.3 7.7 kg/d), and days in milk (mean = 110 62 d) were used as independent variables in the model. The adequacy of the DMI prediction models was evaluated based on coefficient of determination, mean square prediction error (MSPE), root MSPE (RMSPE), and concordance correlation coefficient (CCC). The observed DMI obtained from the data set used to evaluate the prediction models averaged 17.6 3.2 kg/d. The following model was proposed: DMI (kg/d) = [0.4762 ( 0.0358) 4% fat-corrected milk + 0.07219 ( 0.00605) body weight(0.75)] (1 - e(-0.03202 ( 0.00615) [days in milk + 24.9576 ( 5.909)])). This model explained 93.0% of the variation in DMI, predicting it with the lowest mean bias (0.11 kg/d) and RMSPE (4.9% of the observed DMI) and the highest precision [correlation coefficient estimate (?) = 0.97] and accuracy [bias correction factor (Cb)=0.99]. The NRC model prediction equation explained 92.0% of the variation in DMI and had the second lowest mean bias (0.42 kg/d) and RMSPE (5.8% of the observed DMI), as well as the second highest precision (? = 0.94) and accuracy (Cb = 0.98). The CNCPS and AFRC DMI prediction models explained 93.0 and 85.0% of the variation in DMI but underpredicted DMI by 1.8 and 1.4 kg/d, respectively. These 2 models (CNCPS and AFRC) resulted, respectively, in RMSPE of 11.3 and 10.7% of the observed DMI, with moderate to high precision (? = 0.81 and 0.82) and accuracy (Cb = 0.84 and 0.89). The remaining 2 models resulted in the poorest results, underpredicting DMI by 2.3 and 1.9 kg/d, with RMSPE of 22.8 and 14.9% of the observed DMI and moderate to low precision (? = 0.49 and 0.76) and accuracy (Cb = 0.81 and 0.86). The new model derived from the current meta-analytical approach provided the best accuracy and precision for predicting DMI in lactating dairy cows under Brazilian conditions. PMID:24731647

Souza, M C; Oliveira, A S; Arajo, C V; Brito, A F; Teixeira, R M A; Moares, E H B K; Moura, D C

2014-06-01

285

High performance computing and communications: Investment in American competitiveness  

SciTech Connect

This report presents the results of a study performed by Gartner Group, Inc. for the US Department of Energy (DOE), through a contract with the Los Alamos National Laboratory (LANL). The purpose of the study is to estimate the economic impact of the Federal High Performance Computing and Communications (HPCC) Program which was proposed by the Office of Science and Technology Policy (OSTP), Executive Office of the President, on September 8, 1989. That Program is an implementation of the Research and Development Strategy for High Performance Computing, which was transmitted to Congress by OSTP on November 20, 1988. The objective of this Gartner Group study to provide an assessment of the likely economic impact and benefits of the Federal HPCC Program and the risks of non-support of this program. The goals of the HPCC Program are to: support computational advances through R D effort; Reduce uncertainties to industry through increased cooperation and continued use of government as a market for High Performance Computing (HPC) prototypes; Support underlying research, network, and computational infrastructures; and support the U.S. human resource base.

Not Available

1991-03-15

286

High performance computing and communications: Investment in American competitiveness  

NASA Astrophysics Data System (ADS)

This report presents the results of a study performed by Gartner Group, Inc. for the U.S. Department of Energy (DOE), through a contract with the Los Alamos National Laboratory (LANL). The purpose of the study is to estimate the economic impact of the Federal High Performance Computing and Communications (HPCC) Program which was proposed by the Office of Science and Technology Policy (OSTP), Executive Office of the President, on September 8, 1989. That Program is an implementation of the Research and Development Strategy for High Performance Computing, which was transmitted to Congress by OSTP on November 20, 1988. The objective of this Gartner Group study to provide an assessment of the likely economic impact and benefits of the Federal HPCC Program and the risks of non-support of this program. The goals of the HPCC Program are to: support computational advances through R and D effort; Reduce uncertainties to industry through increased cooperation and continued use of government as a market for High Performance Computing (HPC) prototypes; Support underlying research, network, and computational infrastructures; and support the U.S. human resource base.

1991-03-01

287

High-throughput measurement of gap junctional intercellular communication.  

PubMed

Gap junctional intercellular communication (GJIC) is a critical part of cellular activities and is necessary for electrical propagation among contacting cells. Disorders of gap junctions are a major cause for cardiac arrhythmias. Dye transfer through microinjection is a conventional technique for measuring GJIC. To overcome the limitations of manual microinjection and perform high-throughput GJIC measurement, here we present a new robotic microinjection system that is capable of injecting a large number of cells at a high speed. The highly automated system enables large-scale cell injection (thousands of cells vs. a few cells) without major operator training. GJIC of three cell lines of differing gap junction density, i.e., HeLa, HEK293, and HL-1, was evaluated. The effect of a GJIC inhibitor (18-?-glycyrrhetinic acid) was also quantified in the three cell lines. System operation speed, success rate, and cell viability rate were quantitatively evaluated based on robotic microinjection of over 4,000 cells. Injection speed was 22.7 cells per min, with 95% success for cell injection and >90% survival. Dye transfer cell counts and dye transfer distance correlated with the expected connexin expression of each cell type, and inhibition of dye transfer correlated with the concentration of GJIC inhibitor. Additionally, real-time monitoring of dye transfer enables the calculation of coefficients of molecular diffusion through gap junctions. This robotic microinjection dye transfer technique permits rapid assessment of gap junction function in confluent cell cultures. PMID:24778169

Liu, Jun; Siragam, Vinayakumar; Chen, Jun; Fridman, Michael D; Hamilton, Robert M; Sun, Yu

2014-06-15

288

SLIM, Short-pulse Technology for High Gradient Induction Accelerators  

SciTech Connect

The conclusions of this paper are: (1) The gradient of the SLIM-based technology is believed to be achievable in the same range as it is for the gradient of a modern rf-linac technology ({approx}100 MeV per meter). (2) The SLIM concept is based on the nsec TEM pulse mode operation with no laser or rf systems. (3) Main components of SLIM are not stressed while the energy is pumped into the induction system. Components can accept the hard environment conditions such as a radiation dose, mismatch, hard electromagnetic nose level, etc. Only for several nanoseconds the switch is OFF and produces a stress in the induction system. At that time, the delivery of energy to the beam takes place. (4) The energy in the induction system initially is storied in the magnetic field when the switch is ON. That fact makes another benefit: a low voltage power supplies can be used. The reliability of a lower voltage power supply is higher and they are cheaper. (5) The coreless SLIM concept offers to work in the MHz range of repetition rate. The induction system has the high electric efficiency (much higher than the DWA). (6) The array of lined up and activated SLIM cells is believed to be a solid state structure of novel accelerating technology. The electron-hole plasma in the high power solid state structure is precisely controlled by the electromagnetic process of a pulsed power supply.

Krasnykh, A.; /SLAC; Kardo-Sysoev, A.; /Ioffe Phys. Tech. Inst.; Arntz, F.; /Diversified Tech., Bedford

2009-12-09

289

PM: An Operating System Coordinated High Performance Communication Library  

Microsoft Academic Search

. We have developed a new communication library, called PM,for the Myrinet gigabit LAN card, that has a dedicated processor andon-board memory to handle a communication protocol. In order to obtainhigh performance communication and support a multi-user environment,we have co-desgined PM, an operating system realized by adaemon process, and the run-time routine for a programming language.Several unique features, e.g., network

Hiroshi Tezuka; Atsushi Hori; Yutaka Ishikawa; Mitsuhisa Sato

1997-01-01

290

Interplay of mulitphoton and tunneling ionization in short-wavelength-driven high-order harmonic generation  

E-print Network

High-order harmonic generation efficiency is theoretically modeled and compared with experiments using 400 and 800 nm driver pulses. It is shown that, for a short drive wavelength and a Keldysh parameter larger than 1, the ...

Kaertner, Franz X.

291

A framework for energy-scalable communication in high-density wireless networks  

Microsoft Academic Search

Power-aware communication is essential for maximizing the life?time of energy-constrained wireless devices. Applications running on such devices can cooperatively reduce communication energy by trading communication latency, reliability, or range for energy savings. We introduce a framework that exposes these high level trade-offs to a power-aware communication subsystem featuring variable-strength convolutional coding, an adjustable power ampli?fier, and a voltage-scaled processor. An

Rex Min; Anantha Chandrakasan

2002-01-01

292

Communications.  

ERIC Educational Resources Information Center

Five articles discussing communications in vocational education include "The Golden Rule of Administration" by Ben Mortensen; "Vital Link with Parents" by Richard Sullivan; "An Interpersonal Exercise" by John Villiers; "Face to Face with Employers" by Gregg Bosak; and "Recruitment Strategies" by Susan Miller. (SK)

Mortensen, Ben F.; And Others

1981-01-01

293

10 Gb/s optical carrier distributed network with W-band (0.1 THz) short-reach wireless communication system  

NASA Astrophysics Data System (ADS)

Millimeter-wave (mm-wave) operated in W-band (75 GHz-0.11 THz) is of particular interests, since this frequency band can carry signals at much higher data rates. We demonstrate a 10 Gb/s optical carrier-distributed network with the wireless communication system. The mm-wave signal at carrier frequency of 0.1 THz is generated by a high speed near-ballistic uni-traveling carrier photodiode (NBUTC-PD) based transmitter (Tx), which is optically excited by optical short pulses. The optical pulse source is produced from a self-developed photonic mm-wave waveform generator (PMWG), which allows spectral line-by-line pulse shaping. Hence these optical pulses have high tolerance to fiber chromatic dispersion. The W-band 10 Gb/s wireless data is transmitted and received via a pair of horn antennas. The received 10 Gb/s data is envelope-detected and then used to drive an optical modulator at the remote antenna unit (RAU) to produce the upstream signal sending back to the central office (CO). 20 km single mode fiber (SMF) error free transmission is achieved. Analysis about the optimum repetition rate of the optical pulse source and the transmission performance of the upstream signal are also performed and discussed.

Chow, C. W.; Yang, L. G.; Yeh, C. H.; Huang, C. B.; Shi, J. W.; Pan, C. L.

2012-10-01

294

Toward High-Performance Communications Interfaces for Science Problem Solving  

NASA Astrophysics Data System (ADS)

From a theoretical viewpoint, educational interfaces that facilitate communicative actions involving representations central to a domain can maximize students' effort associated with constructing new schemas. In addition, interfaces that minimize working memory demands due to the interface per se, for example by mimicking existing non-digital work practice, can preserve students' attentional focus on their learning task. In this research, we asked the question: What type of interface input capabilities provide best support for science problem solving in both low- and high- performing students? High school students' ability to solve a diverse range of biology problems was compared over longitudinal sessions while they used: (1) hardcopy paper and pencil (2) a digital paper and pen interface (3) pen tablet interface, and (4) graphical tablet interface. Post-test evaluations revealed that time to solve problems, meta-cognitive control, solution correctness, and memory all were significantly enhanced when using the digital pen and paper interface, compared with tablet interfaces. The tangible pen and paper interface also was the only alternative that significantly facilitated skill acquisition in low-performing students. Paradoxically, all students nonetheless believed that the tablet interfaces provided best support for their performance, revealing a lack of self-awareness about how to use computational tools to best advantage. Implications are discussed for how pen interfaces can be optimized for future educational purposes, and for establishing technology fluency curricula to improve students' awareness of the impact of digital tools on their performance.

Oviatt, Sharon L.; Cohen, Adrienne O.

2010-12-01

295

Healthy, Beneficial Communication in Parents of High-Risk Children.  

ERIC Educational Resources Information Center

Parental communication, particularly in the areas of cognitive clarity and affect, has been implicated in the etiology of psychiatric disorders in children. This paper reports a method for studying Healthy Features in parental communication, aspects of verbal style that counteract a child's exposure to genetic and social environmental risk

Schuldberg, David

296

Chemical Communication  

NSDL National Science Digital Library

A concise lesson about chemical communication in insects covering both semio and info chemicals. The site includes a short video of grape root borer moths using sex pheromone. Further links on the take the user to visual and auditory communication.

0002-11-30

297

Power budget analysis of short reach optical communications based on 4x4 polymer clad fiber splitter  

NASA Astrophysics Data System (ADS)

A new type of novel all-fiber power splitter has been designed and experimentally demonstrated, which could be directly applied to very short reach (VSR) passive optical networks (PON) based on hard polymer clad fibers (HPCF). Overcoming silica glass manufacturing difficulties, we successfully developed a 4x4 HPCF star coupler using a micro hydrogen-burner flame brushing. The device showed an excellent uniformity in power splitting ratio along with a very low excess loss of 4.58dB and insertion loss of 10.5dB over a wide wavelength range 600-900nm. Transmission quality and power budget for PON using the devices were analyzed for 1.25 and 2.5Gbps at 10, 25, 50m, whose results confirmed highly practical potential of the proposed device in VSR PON systems with a reasonable power budget.

Bae, Sangchul; Jeong, Yunsong; Shin, Woojin; Oh, Kyunghwan

2005-04-01

298

Multiplexed communication over a high-speed quantum channel  

SciTech Connect

In quantum information systems it is of particular interest to consider the best way in which to use the nonclassical resources consumed by that system. Quantum communication protocols are integral to quantum information systems and are among the most promising near-term applications of quantum information science. Here we show that a multiplexed, digital quantum communications system supported by a comb of vacuum squeezing has a greater channel capacity per photon than a source of broadband squeezing with the same analog band width. We report on the time-resolved, simultaneous observation of the first dozen teeth in a 2.4-GHz comb of vacuum squeezing produced by a subthreshold optical parametric oscillator, as required for such a quantum communications channel. We also demonstrate multiplexed communication on that channel.

Heurs, M.; Webb, J. G.; Dunlop, A. E.; Harb, C. C.; Huntington, E. H. [Centre for Quantum Computer Technology, School of Information Technology and Electrical Engineering, University College, University of New South Wales, Canberra, Australian Capitol Territory 2600 (Australia); Ralph, T. C. [Centre for Quantum Computer Technology, Department of Physics, University of Queensland, St. Lucia, Brisbane, Queensland 4072 (Australia)

2010-03-15

299

High-performance signal acquisition algorithms for wireless communications receivers  

E-print Network

Due to the uncertainties introduced by the propagation channel, and RF and mixed signal circuits imperfections, digital communication receivers require efficient and robust signal acquisition algorithms for timing and carrier recovery, and interfer...

Shi, Kai

2006-10-30

300

Communication Communication  

E-print Network

Communication Seminar Stanford University April 16, 2001 1 #12; Wireless Communication Theory . Wireless communication theory is having a renaissance in the past decade. . Much of it is centered around how to communicate e#ectively over fading channels. . A modern view of communication over fading channels is emerging

Tse, David

301

Investigation of the Effect of Sport on Submissive Behavior and Communication Skills of High School Students  

ERIC Educational Resources Information Center

This study was carried out to detect the differences in submissive behaviors and communication skills of high school students in terms of sports activities and relationship between communication skills and properties of submissive behavior of high school students who are actively involved in sports activities. In this respect at the study, 728

Abakay, Ugur

2013-01-01

302

A HIGH-POWER FREE ELECTRON LASER USING A SHORT RAYLEIGH LENGTH  

E-print Network

A HIGH-POWER FREE ELECTRON LASER USING A SHORT RAYLEIGH LENGTH W. B. Colson a , A. Todd b , and G average current. PACS-2001 Code: 41.60Cr Keywords: free electron laser, high power, Rayleigh length Energy Systems, P.O. Box 7455, Princeton, NJ 08543 USA c Free Electron Laser Department, Thomas Jefferson

303

NASA satellite communications application research, phase 2 addendum. Efficient high power, solid state amplifier for EHF communications  

NASA Technical Reports Server (NTRS)

This document is an addendum to the NASA Satellite Communications Application Research (SCAR) Phase 2 Final Report, 'Efficient High Power, Solid State Amplifier for EHF Communications.' This report describes the work performed from 1 August 1993 to 11 March 1994, under contract number NASW-4513. During this reporting period an array of transistor amplifiers was repaired by replacing all MMIC amplifier chips. The amplifier array was then tested using three different feedhorn configurations. Descriptions, procedures, and results of this testing are presented in this report, and conclusions are drawn based on the test results obtained.

Benet, James

1994-01-01

304

Generation of high-energy (>15 MeV) neutrons using short pulse high intensity lasers  

SciTech Connect

A roadmap is suggested and demonstrated experimentally for the production of high-energy (>15 MeV) neutrons using short pulse lasers. Investigation with a 3D Monte Carlo model has been employed to quantify the production of energetic neutrons. Numerical simulations have been performed for three nuclear reactions, d(d,n){sup 3}He, {sup 7}Li(d,n){sup 8}Be, and {sup 7}Li(p,n){sup 7}Be, driven by monoenergetic ion beams. Quantitative estimates for the driver ion beam energy and number have been made and the neutron spectra and yield in the ion propagation direction have been evaluated for various incident ion energies. In order to generate neutron fluence above a detection limit of 10{sup 6} neutrons/sr, either {approx}10{sup 10} protons with energy 20-30 MeV or comparable amount of deuterons with energy 5-10 MeV are required. Experimental verification of the concept with deuterons driven by the Titan laser (peak intensity 2 Multiplication-Sign 10{sup 19} W/cm{sup 2}, pulse duration of 9 ps, wavelength 1.05 {mu}m, and energy of 360 J) is provided with the generation of neutrons with energy of up to 18 MeV from {sup 7}Li(d,n){sup 8}Be reactions. Future research will focus on optimized schemes for ion acceleration for production of high-energy neutrons, which will involve efficient target design, laser parameter optimization, and converter material.

Petrov, G. M.; Davis, J.; Petrova, Tz. B. [Naval Research Laboratory, Plasma Physics Division, 4555 Overlook Ave. SW, Washington, DC 20375 (United States); Higginson, D. P. [Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, California 92093 (United States); Lawrence Livermore National Laboratory, Livermore, California 94440 (United States); McNaney, J. M. [Lawrence Livermore National Laboratory, Livermore, California 94440 (United States); McGuffey, C.; Qiao, B.; Beg, F. N. [Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, California 92093 (United States)

2012-09-15

305

High bandwidth specialty optical fibers for data communications  

NASA Astrophysics Data System (ADS)

Perhaps the most common specialty optical fiber is HCS hard polymer clad silica fiber. It was invented almost 30 years ago for transmitting laser light to initiate explosives in mining industry and later adapted to be used in a variety of new applications, such as data communications. The most typical HCS fiber typically consists of a 200 ?m pure silica glass core, a thin coating of low refractive index hard polymer as the cladding, and an ETFE buffer. This design enables the "crimp-and-cleave" technique of terminating and connectorizing fibers quickly and reliably. Its greater glass diameter also renders greater robustness allowing the fiber to endure greater forces during installation. Due to its larger core size and high numerical aperture (NA), the fiber can be used with a plastic connector and low cost LED transmitter that can greatly reduce the system cost. It can also be used at higher temperature and humidity conditions than standard optical fibers coated with telecommunications grade acrylate material. As applications evolve and require greater bandwidth and/or performance over a greater distance, the challenge now is to develop specialty optical fibers with significantly greater bandwidth-length product while maintaining all other characteristics critical to their ease of use and performance. As a response to the demand, two new fiber types have been designed and developed as higher bandwidth versions of the original HCS fiber. In this paper, we will discuss some of the main design requirements for the fibers, describe in detail the two designs, and present the results of fiber performance.

Li, Jie; Sun, Xiaoguang

2008-11-01

306

Comparison of Short and Continuous Hydration Regimen in Chemotherapy Containing Intermediate- to High-Dose Cisplatin  

PubMed Central

Aim. The efficacy of the short hydration regimen was reported in chemotherapy containing intermediate- to high-dose cisplatin, and the use of outpatient chemotherapy containing cisplatin with short hydration has been widespread in recent years. Methods. We compared patients with gastric cancer, lung cancer, and urothelial cancer who received outpatient chemotherapy containing cisplatin (?60?mg/m2/cycle) with the short hydration regimen since April 2012 (n = 13) with those who received hospital chemotherapy with continuous hydration between April 2011 and March 2013 (n = 17) in our hospital. Results. Grade 2 or higher acute kidney injury occurred in 2 patients in the continuous hydration group and in no patient in the short hydration group; 1 patient discontinued treatment on account of nephrotoxicity. There was no difference between the 2 groups in maximum creatinine increment and maximum clearance decrement. Relative dose intensity in the short hydration group was higher than that in the continuous hydration group (89.5% versus 80.3%; P < 0.01). Conclusions. The short hydration regimen in outpatient chemotherapy containing intermediate- to high-dose cisplatin is as safe as the continuous hydration regimen and increased the efficacy of chemotherapy. PMID:25328521

Ouchi, Akira; Asano, Masahiko; Aono, Keiya; Watanabe, Tetsuya; Kato, Takehiro

2014-01-01

307

Model of Atmospheric Links on Optical Communications from High Altitude  

NASA Technical Reports Server (NTRS)

Optical communication links have the potential to solve many of the problems of current radio and microwave links to satellites and high-altitude aircraft. The higher frequency involved in optical systems allows for significantly greater signal bandwidth, and thus information transfer rate, in excess of 10 Gbps, and the highly directional nature of laser-based signals eliminates the need for frequency-division multiplexing seen in radio and microwave links today. The atmosphere, however, distorts an optical signal differently than a microwave signal. While the ionosphere is one of the most significant sources of noise and distortion in a microwave or radio signal, the lower atmosphere affects an optical signal more significantly. Refractive index fluctuations, primarily caused by changes in atmospheric temperature and density, distort the incoming signal in both deterministic and nondeterministic ways. Additionally, suspended particles, such as those in haze or rain, further corrupt the transmitted signal. To model many of the atmospheric effects on the propagating beam, we use simulations based on the beam-propagation method. This method, developed both for simulation of signals in waveguides and propagation in atmospheric turbulence, separates the propagation into a diffraction and refraction problem. The diffraction step is an exact solution, within the limits of numerical precision, to the problem of propagation in free space, and the refraction step models the refractive index variances over a segment of the propagation path. By applying refraction for a segment of the propagation path, then diffracting over that same segment, this method forms a good approximation to true propagation through the atmospheric medium. Iterating over small segments of the total propagation path gives a good approximation to the problem of propagation over the entire path. Parameters in this model, such as initial beam profile and atmospheric constants, are easily modified in a simulation such as this, which allows for the rapid analysis of different propagation scenarios. Therefore, this method allows the development of a near-optimal system design for a wide range of situations, typical of what would be seen in different atmospheric conditions over a receiving ground station. A simulation framework based upon this model was developed in FORTRAN, and for moderate grid sizes and propagation distances these simulations are computable in reasonable time on a standard workstation. This presentation will discuss results thus far.

Subich, Christopher

2004-01-01

308

Measuring fracture toughness of high-impact poly(methyl methacrylate) with the short rod method.  

PubMed

A comparison between the plane strain fracture resistance (Klc) of high-impact PMMA and conventional resins was made. Because microcracks and surface irregularities can be introduced when PMMA is cut, a specially designed sample-forming device that processed specimens with a minimal amount of machining was used. Specimens were made in the final shape of short rods as proposed by Barker and Barker and Baratta. The results showed that the fracture resistance (Klc) values of processed short rod specimens of high-impact Lucitone 199 resin were more than twice those of the control. PMID:3172010

Neihart, T R; Li, S H; Flinton, R J

1988-08-01

309

When Are High-Tech Communicators Effective in Parkinson's Disease?  

ERIC Educational Resources Information Center

This report describes a 63-year-old woman with Parkinson's disease showing loss of intelligibility of speech and severely impaired handwriting, despite undergoing physical and speech therapies. As the patient had sufficient residual motor abilities and adequate cognitive function and motivation, a computer-based communication aid with a software

Ferriero, Giorgio; Caligari, Marco; Ronconi, Gianpaolo; Franchignoni, Franco

2012-01-01

310

An Investigation of Communication in Virtual High Schools  

ERIC Educational Resources Information Center

Virtual schooling is an increasing trend for secondary education. Research of the communication practices in virtual schools has provided a myriad of suggestions for virtual school policies. The purpose of this qualitative study was to investigate the activities and processes involved in the daily rituals of virtual school teachers and learners

Belair, Marley

2012-01-01

311

Single and repetitive short-pulse high-power microwave window breakdown  

NASA Astrophysics Data System (ADS)

The mechanisms of high-power microwave breakdown for single and repetitive short pulses are analyzed. By calculation, multipactor saturation with electron density much higher than the critical plasma density is found not to result in microwave cutoff. It is local high pressure about Torr class that rapid plasma avalanche and final breakdown are realized in a 10-20 ns short pulse. It is found by calculation that the power deposited by saturated multipactor and the rf loss of protrusions are sufficient to induce vaporizing surface material and enhancing the ambient pressure in a single short pulse. For repetitive pulses, the accumulation of heat and plasma may respectively carbonize the surface material and lower the repetitive breakdown threshold.

Chang, C.; Shao, H.; Chen, C. H.; Tang, C. X.; Huang, W. H.

2010-05-01

312

High-Speed Non-Directional Infrared Communication for Wireless Local-Area Networks  

E-print Network

radio are the availabil- ity of a virtually unlimited, unregulated spectrum, and the fact that infrared- diodes, the wavelength band near 800 nm is probably the best choice for diffuse infrared communicationsHigh-Speed Non-Directional Infrared Communication for Wireless Local-Area Networks J. M. Kahn, J. R

Carruthers, Jeffrey

313

High-performance multi-queue buffers for VLSI communications switches  

Microsoft Academic Search

Small nxn switches are key components of multistage interconnection networks used in multiprocessors as well as in the communication coprocessors used in multicomputers. The design of the internal buffers in these switches is of critical importance for achieving high throughput low latency communication. We discuss several buffer structures and compare them in terms of implementation complexity and their ability to

Yuval Tamir; Gregory L. Frazier

1988-01-01

314

Using mobile communication technology in high school education: Motivation, pressure, and learning performance  

Microsoft Academic Search

Motivation and pressure are considered two factors impacting vocational senior high school student learning. New communication technology, especially mobile communication technology, is supposed to be effective in encouraging inter- action between the student and the instructor and improving learning efficiency. Social presence and information richness theory was applied to analyze the media and their impacts on the instruction process firstly.

Pei-luen Patrick Rau; Qin Gao; Li-mei Wu

2008-01-01

315

Computer Mediated Communication: Providing Pastoral Care to Youth in A High Tech World  

Microsoft Academic Search

This study used a hermeneutical methodology to explore how Computer Mediated Communication (CMC) can be used to provide pastoral care to youth in a high tech world. The research was motivated by the writers desire to find ways to be in communication with youth and provide pastoral care to them during their adolescent years. The thesis will explore computer mediated

Tanya L. Ramer

2008-01-01

316

Using Mobile Communication Technology in High School Education: Motivation, Pressure, and Learning Performance  

ERIC Educational Resources Information Center

Motivation and pressure are considered two factors impacting vocational senior high school student learning. New communication technology, especially mobile communication technology, is supposed to be effective in encouraging interaction between the student and the instructor and improving learning efficiency. Social presence and information

Rau, Pei-Luen Patrick; Gao, Qin; Wu, Li-Mei

2008-01-01

317

HIGH-EFFICIENCY BEAM EXTRACTION AND COLLIMATION USING CHANNELING IN VERY SHORT BENT CRYSTALS  

E-print Network

, a crystal with no "twist" was fabricated in the form of the letter O from a monolithic piece of Si321 HIGH-EFFICIENCY BEAM EXTRACTION AND COLLIMATION USING CHANNELING IN VERY SHORT BENT CRYSTALS Yu of beam extraction from accelerator ring based on using bent crystals is successfully developed

Titov, Anatoly

318

The National Ignition Facility National Ignition Campaign Short Pulse Lasers High-Average-Power Laser  

E-print Network

#12;The National Ignition Facility National Ignition Campaign Short Pulse Lasers High · Future energy source · Transition to hydrogen economy #12;Major elements of the National Ignition The National Ignition Campaign P9674 The National Ignition Campaign #12;P9675 NIC Planning Status Developed set

319

Validation of the Short Form of the Career Development Inventory with an Iranian High School Sample  

ERIC Educational Resources Information Center

A short 33-item form of the Career Development Inventory was validated on a sample of 310 Iranian high school students. Factor analysis indicated that attitude and cognitive subscale items loaded on their respective factors, and that internal reliability coefficients at all levels were satisfactory to good. Support for validity was demonstrated by

Sadeghi, Ahmad; Baghban, Iran; Bahrami, Fatemeh; Ahmadi, Ahmad; Creed, Peter

2011-01-01

320

SHORT REPORT Open Access High viral load of Merkel cell polyomavirus DNA  

E-print Network

SHORT REPORT Open Access High viral load of Merkel cell polyomavirus DNA sequences in Langerhans dermotropic Merkel cell polyomavirus (MCPyV) and determined the relationship between LC histiocytosis (LCH = relative levels of MCPyV) were detected (0.328­0.772 copies/cell (Merkel cell carcinoma (MCC) = 1.0)) using

Boyer, Edmond

321

EUROGRAPHICS 2003 / M. Chover, H. Hagen and D. Tost Short Presentations Automatic High Level Avatar Guidance  

E-print Network

EUROGRAPHICS 2003 / M. Chover, H. Hagen and D. Tost Short Presentations Automatic High Level Avatar of the avatars. We introduce to the Graphics community a new method adapted from ideas recently presented in the Architecture literature. In this method, the general avatar movements are derived from an analysis

Chrysanthou, Yiorgos

322

High-voltage and short-rise-time pulse-transformer with amorphous cores  

Microsoft Academic Search

A short rise time pulsed power transformer using cobalt-based amorphous alloy cores, which operates at high voltage (~100 kV) and high repetition rate (~4000 pps), has been developed for application as a pulsed power modulator for copper vapor lasers. An output voltage of more than 80 kV, a rise time of 65 ns and a transformation efficiency of 83% were

N. Kobayashi; N. Aoki; H. Horie; Y. Baba; Y. Sano; H. Kimura; C. Konagal

1997-01-01

323

Investigation of short circuit current sublinearities in high resistivity base silicon solar cells  

Microsoft Academic Search

Mechanisms which lead to a sublinearity of the short-circuit current as a function of illuination intensity in conventional-geometry, high-resistivity-base silicon solar cells are examined. A computer simulation code, SCAP1D, is used for the study. It is shown that sublinearity is due to the loss of base conductivity modulation coupled with a source of high recombination in the cell. It is

E. K. Banghart; J. L. Gray; R. J. Schwartz

1987-01-01

324

Experimental demonstration of 10 Gb/s multi-level carrier-less amplitude and phase modulation for short range optical communication systems.  

PubMed

Carrier-less amplitude and phase (CAP) modulation can be a good candidate for short range optical communications for considerable computational complexity reduction and simple system structure. In this paper, a detailed investigation on the digital filters in CAP modulation system is presented. An adaptive equalizer based on cascaded multi-modulus algorithm (CMMA) is used for the demodulation at the receiver. The impact of digital filter taps on system performance is investigated through comprehensive simulations and a 10 Gb/s CAP16 modulation system is demonstrated experimentally. The BER performance for different length of fiber link is measured. Compared with back-to-back (BTB) transmissions, 2 dB and 3.5 dB receiver power penalty are observed at BER of 10(-3) for 20 km and 40 km fiber link respectively. It clearly demonstrates the feasibility of the CAP16 modulation for the short range transmission systems. PMID:23482215

Tao, Li; Wang, Yiguang; Gao, Yuliang; Lau, Alan Pak Tao; Chi, Nan; Lu, Chao

2013-03-11

325

A Short Communication Course for Physicians Improves the Quality of Patient Information in a Clinical Trial | accrualnet.cancer.gov  

Cancer.gov

This article addresses the question of how to improve the informed consent process. The investigators tested a one-day communications course for physicians and research nurses that included lecture and role-play approaches for its ability to improve the quality of informed consent and the satisfaction of patients who enrolled in a randomized clinical trial of adjuvant treatment for breast cancer.

326

http://journals.cambridge.org Downloaded: 17 Apr 2013 IP address: 150.131.78.145 Short Communication  

E-print Network

Communication Royal Manas National Park, Bhutan: a hot spot for wild felids T S H E R I N G T E M P A , M A R K Himalayan region, Bhutan has been identified as a conservation priority area by all these different approaches, yet data validating these assessments are limited. To examine whether Bhutan is a biodiversity

Hebblewhite, Mark

327

Transformation of short-periodic high-inclination orbits of circumsolar submillimeter dust  

SciTech Connect

Disintegration of short-periodic comets is one of the sources of cosmic dust in the Solar System. Initially dust particles move approximately in the orbits of parent comets, in particular, in high-inclination orbits. In a few million years, some of these particles (the smallest ones) go over to the short-periodic, high-inclination orbits due to the Poynting-Robertson effect. The numerical integration of the equations of motion at this stage of evolution gives rise to somewhat surprising results. For example, when integrating the equations of motion as far back as 6000 years from the time of meteor observation, the real meteor particle gains the perihelion distance smaller than the solar radius (!). Our calculations show that the time of falling onto the Sun is shorter for a article moving in a high-inclination orbit. This is due to the superposition of gravitational perturbation and radiation effects.

Bazei, A.A.; Kramer, E.N. [Mechnikov Univ., Odessa (Ukraine)

1995-11-01

328

HF (High Frequency) Communications Frequency-Management Procedure for Forecasting the Frequency of Optimum Transmission.  

National Technical Information Service (NTIS)

This report describes a procedure for forecasting the Frequency of Optimum Transmission (FOT) on a high-frequency communications path when the Maximum Observable Frequency (MOF) on another path and an historical record of the correlations of MOFs measured...

M. Daehler

1984-01-01

329

High-speed low-power short-reach optical interconnects for high-performance computing and servers  

NASA Astrophysics Data System (ADS)

High Performance Computing and High-end Servers make use of optical interconnects today and future design points for these systems are pushing for higher speeds and lower power simultaneously. This paper will review the use of embedded optical interconnects in HPC and cover the latest research records for speed (56Gb/s) and energy efficiency (1pJ/bit) of short reach (<50m) links.

Kuchta, Daniel M.

2014-02-01

330

Whole-Genome Sequencing and Assembly with High-Throughput, Short-Read Technologies  

PubMed Central

While recently developed short-read sequencing technologies may dramatically reduce the sequencing cost and eventually achieve the $1000 goal for re-sequencing, their limitations prevent the de novo sequencing of eukaryotic genomes with the standard shotgun sequencing protocol. We present SHRAP (SHort Read Assembly Protocol), a sequencing protocol and assembly methodology that utilizes high-throughput short-read technologies. We describe a variation on hierarchical sequencing with two crucial differences: (1) we select a clone library from the genome randomly rather than as a tiling path and (2) we sample clones from the genome at high coverage and reads from the clones at low coverage. We assume that 200 bp read lengths with a 1% error rate and inexpensive random fragment cloning on whole mammalian genomes is feasible. Our assembly methodology is based on first ordering the clones and subsequently performing read assembly in three stages: (1) local assemblies of regions significantly smaller than a clone size, (2) clone-sized assemblies of the results of stage 1, and (3) chromosome-sized assemblies. By aggressively localizing the assembly problem during the first stage, our method succeeds in assembling short, unpaired reads sampled from repetitive genomes. We tested our assembler using simulated reads from D. melanogaster and human chromosomes 1, 11, and 21, and produced assemblies with large sets of contiguous sequence and a misassembly rate comparable to other draft assemblies. Tested on D. melanogaster and the entire human genome, our clone-ordering method produces accurate maps, thereby localizing fragment assembly and enabling the parallelization of the subsequent steps of our pipeline. Thus, we have demonstrated that truly inexpensive de novo sequencing of mammalian genomes will soon be possible with high-throughput, short-read technologies using our methodology. PMID:17534434

Sundquist, Andreas; Ronaghi, Mostafa; Tang, Haixu; Pevzner, Pavel; Batzoglou, Serafim

2007-01-01

331

ASIC IMPLEMENTATION OF A HIGH SPEED WGNG FOR COMMUNICATION CHANNEL EMULATION  

Microsoft Academic Search

A design for a White Gaussian Noise Generator (WGNG) is modified and implemented as a 0.18-m CMOS digital ASIC for high-speed communication channel emulation. The original design was implemented using an FPGA. The goal of the work presented is to enhance the performance of the WGNG in order to achieve emulation of high-speed communication standards unattainable by the FPGA implementation.

Edmund Fung; Kaston Leung; Nitin Parimi; Madhura Purnaprajna; Vincent C. Gaudet

2004-01-01

332

ASIC implementation of a high speed WGNG for communication channel emulation [white Gaussian noise generator  

Microsoft Academic Search

A design for a white Gaussian noise generator (WGNG) is modified and implemented as a 0.18-?m CMOS digital ASIC for high-speed communication channel emulation. The original design was implemented using an FPGA. The goal of the work presented is to enhance the performance of the WGNG in order to achieve emulation of high-speed communication standards unattainable by the FPGA implementation.

Edmund Fung; Kaston Leung; Nitin Parimi; Madhura Purnaprajna; Vincent C. Gaudet

2004-01-01

333

Communications and entertainment onboard a high-speed public transport system  

Microsoft Academic Search

This article discusses architectural design at the conceptual\\/functional level of communication and entertainment services onboard a high-speed public transport system, such as a high-speed train, a transoceanic cruise ship, or even a mid- to long-range airplane. Existing commercial mobile communication services, such as AMPS and GSM, are inaccessible to passengers onboard these public transport systems. A hierarchical architecture is laid

Kun-De Lin; Jin-Fu Chang

2002-01-01

334

Simplified processing for high spectral efficiency wireless communication employing multi-element arrays  

Microsoft Academic Search

We investigate robust wireless communication in high-scattering propagation environments using multi-element antenna arrays (MEAs) at both transmit and receive sites. A simplified, but highly spectrally efficient space-time communication processing method is presented. The user's bit stream is mapped to a vector of independently modulated equal bit-rate signal components that are simultaneously transmitted in the same band. A detection algorithm similar

Gerard J. Foschini; Glen D. Golden; Reinaldo A. Valenzuela; Peter W. Wolniansky

1999-01-01

335

Establishing wireless communications services via high-altitude aeronautical platforms: a concept whose time has come?  

Microsoft Academic Search

The focus of this article is high altitude aeronautical platforms (HAAPs) such as airships, planes, helicopters, or some hybrid salutions which could operate at stratospheric altitudes for significant periods of time, be low-cost, and be capable of carrying sizable, multipurpose communications payloads. Of particular interest are ways to implement cellular\\/PCS or high-speed data networks in airborne platforms. From a communications

Goran M. Djuknic; John Freidenfelds; Y. Okunev

1997-01-01

336

Photosynthetic and Biochemical Changes in Response to Short Interval High ``g'' Exposure in Wheat  

NASA Astrophysics Data System (ADS)

We have investigated the effect of short interval post imbibition high g exposure on wheat seeds (Triticum aestivum var.Lok-1) by evaluating the photosynthetic performance, chlorophyll a fluorescence biochemical indices and antioxidant response. Imbibed wheat seeds were exposed to high g ranging from 500 g to 2500 g for 10 min, allowed to germinate and grown for 5 days under normal gravity i.e. 1 g. Chlorophyll a fluorescence transient was examined in wheat seedling raised from hyper gravity treated seeds. Fv/Fm, PI, Fv/Fo decreased in high g treated seeds compared to control. Photosynthetic performance indices such as Transpiration rate, Stomatal conductance, Net photosynthetic rate, Intracellular CO2 concentration, Intrinsic water use efficiency also declined in wheat seedlings raised from High g treated seeds suggesting that high g reduces efficiency of photosynthesis in wheat seedlings. Results of Biochemical analysis showed reduced alpha- amylase activity in wheat seeds subjected to high g ranging from 500 g to 2500 g in a magnitude dependent manner. Decline in enzyme activity was positively correlated with higher starch content and lower reducing sugars in high g exposed wheat seeds. This possibly explains the reduced percent germination and growth in response to high g. Antioxidant enzyme activity (CAT and POX) significantly increased as a result of hypergravity exposure In conclusion, short interval high g exposure results in reduced growth and photosynthetic activity in wheat seedlings.

Dixit, Jyotsana; Vidyasagar, Pandit; Jagtap, Sagar; Kamble, Shailendra

337

The Effect of Cross-Age Tutoring by High Schoolers on Their Understanding and Ability To Create a Short Story.  

ERIC Educational Resources Information Center

The purpose of this study was to see if cross-age tutoring by high schoolers would have an effect on the students' understanding and ability to write a short story. High schoolers, in an elective creative writing course, were paired up with sixth graders from a local feeder elementary. The high schoolers spent time studying specific short story

Ankcorn, Denise

338

Short communication High-performance anode based on porous Co3O4 nanodiscs  

E-print Network

long-term cycle stability of a Co3O4-based anode material is still a significant challenge. Up till- vide higher energy and power levels becomes more acute with rapidly increasing demand for applications, graphitic/ non-graphitic carbons [2], silicon- or tin-based lithium alloys [3e 6], transition-metal oxides

Cao, Guozhong

339

Short communication High-resolution spatial mapping of shear properties in cartilage  

E-print Network

that were reduced up to a factor of 3. This increased resolution allowed us to determine that the shear cartilage using methods such as particle image velocimetry (PIV) that rely on cells and cell nuclei of neonatal bovine and adult human articular cartilage. Using a photobleached grid and numerical optimization

Cohen, Itai

340

Comparison of Internet and Dedicated Communication Protocols for Instrumentation and Measurement Systems using Short Range Wireless Networks  

Microsoft Academic Search

Short-range wireless networks (SRWN) are becoming more and more popular for ubiquitous sensor and actuator connectivity in instrumentation and measurement systems. Currently, a significant number of different protocols glut the markets, leaving the system designer and the end user with the burden of choice. In many cases, these protocols cover layer 1 to 7. Some of them are standardized and

Axel Sikora; Dirk Lill; Voicu Z. Groza

2006-01-01

341

Highly reconfigurable communication protocol multiplexing element for SCOPH  

NASA Astrophysics Data System (ADS)

The Soft Circuitry Optimised Protocol Harness (SCOPH) project is concerned with implementing streaming data paths that perform communication protocol functions. The data paths are implemented dynamically using soft circuitry on a programmed logic array, based upon a small set of parameterised function blocks that are instantiated and linked together on a per-connection basis, and may also be modified during connections. This allows the use of optimised bespoke protocols, with handling of protocol functions at hardware speeds. This paper focuses on one particular pair of function blocks, for the demultiplexing and multiplexing of multiple connections sharing a single communication channel. An example would be multiple TCP port connections simultaneously active over a single IP channel. In the SCOPH context, a single data stream emanating from a main processor or from a network interface would be split into multiple data streams, which undergo protocol processing, and are then recombined into a single stream to a network interface or main processor respectively. The demultiplexor block always requires a means of selecting one of a number of streams, given addressing information in the data stream itself. Symmetrically, the multiplexor block must insert appropriate addressing information into the data stream. However, the main thrust of the paper is in comparing area-time trade-offs between using blocks with a (small) fixed number of streams always configured and using blocks that vary in size and shape with the current number of active streams. Both options are being investigated on a Xilinx Virtex FPGA, using JBits for the dynamic configuration.

Brebner, Gordon

2001-07-01

342

Bilateral deficit during short-term, high-intensity cycle ergometry in girls and boys  

Microsoft Academic Search

. Peak torque during an isokinetic bilateral knee extension or flexion is usually lower than the summed peak torque of two\\u000a unilateral contractions, and this phenomenon is designated as bilateral deficit (BD). The objectives of this study were to\\u000a determine whether a BD also exists for more complex, alternating movements (e.g., short-term, high-intensity cycling), and\\u000a to assess the possible effects

Dsire Dunstheimer; Helge Hebestreit; Britta Staschen; Hans Michael Straburg; Reinhard Jeschke

2001-01-01

343

Effects of short-term high dose, heparin therapy on biochemical markers of bone metabolism  

Microsoft Academic Search

Summary To evaluate the effects of the short-term, high-dose sodium heparin therapy on biochemical markers of bone metabolism, we studied 20 patients (11 males and 9 females) with pulmonary embolism, treated with sodium heparin (daily dose range: 40.00045.000 I.U. by continuous i.v.infusion). Heparin therapy lasted 57 days, after which patients received warfarin over 12 months. Eleven patients (6 males and

F. Cantini; L. Niccoli; F. Bellandi; O. Munno

1995-01-01

344

High-Efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation  

Microsoft Academic Search

This paper presents the new scheme for high-efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation. When the terminal voltage Vi of the hysteresis motor running at synchronous speed is continuously increased up to nVi (n>1) and then continuously decreased to Vi, input currents are reduced and output power is increased at the same time. Because of this, the

Tomotsugu Kubota; Takahiro Tamura; Kazumi Kurihara

2009-01-01

345

Energetic Particle Production in Short-Pulse High-Intensity Laser-Plasma Interactions  

Microsoft Academic Search

We use our MPP Particle-in-Cell (PIC) code, Z3, to investigate energetic particle production in short-pulse high-intensity laser-plasma interactions. Both normal and oblique angles of incidence are considered. The effect of the underdense plasma established by the laser prepulse is also addressed. We report on progress in fashioning an interface between the explicit PIC of Z3 and the implicit PIC simulations

B. F. Lasinski; C. H. Still; A. B. Langdon; R. P. J. Town; M. Tabak

2004-01-01

346

Electrical and Photoelectric Properties of Polycrystalline Silicon after High-Intensity Short-Pulse Ion Implantation  

NASA Astrophysics Data System (ADS)

Electrical and photoelectric properties of polycrystalline silicon after high-intensity short-pulse implantation of carbon ions have been studied. It has been found that vacuum annealing (10-2 Pa, 300-1200 K) of silicon affects the surface dark and photoconductivity. Optimal conditions of thermal vacuum treatment of silicon have been found that provide the most heat and field resistant changes in its properties. Probable causes for the changes in electric and photoelectric characteristics of the material have been revealed.

Kabyshev, A. V.; Konusov, F. V.; Remnev, G. E.

2013-11-01

347

High Capacity Communications From Martian Distances. Part 1; Spacecraft Link Design Analysis  

NASA Technical Reports Server (NTRS)

High capacity space communications has been a desire for Human Exploration and Science missions. Current Mars missions operate at data rates of 120 kbps for telemetry downlink and it is desirable to study high rate communication links in the range of 100 Mbps to 1 Gbps data rates from Martian distances. This paper will present some assumed scenarios along with link design assumptions and link analysis for high capacity communications from Mars. The paper will focus on RF subsystems namely antenna and power for the downlink communication from a relay orbiter at Mars. The relay orbiter will communicate with the low orbit spacecrafts at Mars or any Martian surface elements such as robots, and relay the data back to the ground networks on Earth. The study will dive into the spacecraft downlink system design and communication link analysis between the relay orbiter and ground network on Earth for data rates ranging from 100 Mbps to 1 Gbps based on the assumed scenarios and link assumptions. With high rate links at larger distances, there will be a significant impact on the antenna and power requirements and the link design will make an attempt to minimize the mass of the RF subsystem on the spacecraft. The results of this study will be presented for three data rates 1 Gbps, 500 Mbps and 100 Mbps at maximum Mars to Earth distance of 2.67AU. The design will use a Ka-band downlink with 90% link availability, along with various ground network G/T assumptions and possible bandwidth efficient modulations. The paper will conclude with what types of high rate communication links are feasible from Martian distances and also identify a range of requirements for antenna and power technologies for these high capacity communications from Mars.

Vyas, Hemali N.; Schuchman, Leonard; Orr, Richard; Williams, Wallace Dan; Collins, Michael; Noreen, Gary

2006-01-01

348

Power budget analysis of short reach optical communications based on 4x4 polymer clad fiber splitter  

Microsoft Academic Search

A new type of novel all-fiber power splitter has been designed and experimentally demonstrated, which could be directly applied to very short reach (VSR) passive optical networks (PON) based on hard polymer clad fibers (HPCF). Overcoming silica glass manufacturing difficulties, we successfully developed a 4x4 HPCF star coupler using a micro hydrogen-burner flame brushing. The device showed an excellent uniformity

Sangchul Bae; Yunsong Jeong; Woojin Shin; Kyunghwan Oh

2005-01-01

349

RAPID COMMUNICATION: High performance superconducting wire in high applied magnetic fields via nanoscale defect engineering  

NASA Astrophysics Data System (ADS)

High temperature superconducting (HTS) wires capable of carrying large critical currents with low dissipation levels in high applied magnetic fields are needed for a wide range of applications. In particular, for electric power applications involving rotating machinery, such as large-scale motors and generators, a high critical current, Ic, and a high engineering critical current density, JE, in applied magnetic fields in the range of 3-5 Tesla (T) at 65 K are required. In addition, exceeding the minimum performance requirements needed for these applications results in a lower fabrication cost, which is regarded as crucial to realize or enable many large-scale bulk applications of HTS materials. Here we report the fabrication of short segments of a potential superconducting wire comprised of a 4 m thick YBa2Cu3O7-? (YBCO) layer on a biaxially textured substrate with a 50% higher Ic and JE than the highest values reported previously. The YBCO film contained columns of self-assembled nanodots of BaZrO3 (BZO) roughly oriented along the c-axis of YBCO. Although the YBCO film was grown at a high deposition rate, three-dimensional self-assembly of the insulating BZO nanodots still occurred. For all magnetic field orientations, minimum Ic and JE at 65 K, 3 T for the wire were 353 A cm-1 and 65.4 kA cm-2, respectively.

Wee, Sung Hun; Goyal, Amit; Zuev, Yuri L.; Cantoni, Claudia

2008-09-01

350

Remotely-interrogated high data rate free space laser communications link  

DOEpatents

A system and method of remotely extracting information from a communications station by interrogation with a low power beam. Nonlinear phase conjugation of the low power beam results in a high power encoded return beam that automatically tracks the input beam and is corrected for atmospheric distortion. Intracavity nondegenerate four wave mixing is used in a broad area semiconductor laser in the communications station to produce the return beam.

Ruggiero, Anthony J. (Livermore, CA)

2007-05-29

351

A comparison of perceptions of organizational communication climate and organizational communication conflict between principals of career\\/technical centers and principals of feeder high schools  

Microsoft Academic Search

The purpose of this study was to explore relationships between conflict management styles and organizational communication climates established by comprehensive high school principals and career\\/technical center principals to determine if their methods of handling intraschool conflicts differ. Additionally, differences between principals' and teachers' perceptions of communication climate were examined. Three research questions were posed to determine the relationship between principals'

Janet Lynn Haas

1999-01-01

352

Characteristics of Adverse Effects When Using High Dose Short Term Steroid Regimen  

PubMed Central

Background and Objectives Although the adverse effect of long term steroid usage is well known, the adverse effect of short term high dose steroid usage has not been studied thoroughly. The purpose of this study was to identify the characteristics of the adverse effects when using a high dose steroid for a short term. We also compared the adverse effect of steroid between in- and out-patients. Subjects and Methods The medical record of 500 patients, who were treated with methylprednisolone 48 mg/day for 1-2 weeks, was retrospectively reviewed. Steroid was prescribed due to SSNHL, Bell's palsy, Ramsay-Hunt syndrome and herpes zoster oticus. The incidence of each adverse effect was analyzed, and also the time point of detection was analyzed. The 500 patients were composed of 250 in-patients and 250 out-patients. The adverse effect was compared between these two groups, as well. Results Adverse effect of steroid was found in 33.0% of the patients. Among these adverse effects, abdominal discomfort (26.8%) was most common, followed by skin rash (14.7%), swelling (13.4%), and hot flush (6.9%). Abdominal discomfort and hot flush was mostly detected on the first week. Meanwhile, the skin rash was usually detected on the third week. The incidence of adverse effect was significantly higher in the out-patient group. Conclusions The incidence of high dose short term steroid treatment may be very high. The patients should be warned about these adverse effects. Monitoring should be performed until 3-4 week, since some adverse effects may not be detected until this time point. PMID:24653873

Min, Kyung Hyun; Rhee, Chung-Ku; Jung, Jae Yun

2012-01-01

353

Role of effective teamwork and communication in delivering safe, high-quality care.  

PubMed

Healthcare is delivered in an extraordinary complex environment. Despite highly skilled, dedicated clinicians, there are currently unacceptably high levels of communication failures and adverse events. Effective teamwork, in conjunction with reliable processes of care, is essential for the consistent delivery of high-quality care. Practical concepts and tools are provided that address the team behaviors of structured communication, effective assertion/critical language, psychological safety, situational awareness, and effective leadership. Examples of the mounting clinical evidence of improved patient outcomes and reduced harm resulting from effective teamwork training are cited. PMID:22069205

Leonard, Michael W; Frankel, Allan S

2011-01-01

354

COMMUNICATION TO THE EDITOR High Cell Density Culture of  

E-print Network

for biodegradable plastics and elastomers (Holmes, 1985; Lee, 1996a). One of the major problems in the use of PHB as a bulk plastic material is its high price. With an aim to lower the production cost of PHB, fermen

355

Lifetime measurements of high-lying short lived states in {sup 69}As  

SciTech Connect

Lifetimes of high-spin states in {sup 69}As have been measured using Doppler shift attenuation technique with the GASP and RFD setup. The determined transition probabilities indicate large deformation associated with some rotational bands in this nucleus.

Matejska-Minda, M.; Bednarczyk, P.; Fornal, B.; Ciemala, M.; Kmiecik, M.; Krzysiek, M.; Maj, A.; Meczynski, W.; Myalski, S.; Styczen, J.; Zieblinski, M.; Angelis, G. de; Huyuk, T.; Michelagnoli, C.; Sahin, E.; Aydin, S.; Farnea, E.; Menegazzo, R.; Recchia, F.; Ur, C. A. [Institute of Nuclear Physics, Polish Academy of Sciences, Krakow (Poland); INFN, Laboratori Nazionali di Legnaro, Legnaro (Italy); Dipartimento di Fisica e INFN Padova (Italy); Dipartimento di Fisica e INFN Milano (Italy); Heavy Ion Laboratory, University of Warsaw (Poland); University of York (United Kingdom); and others

2012-10-20

356

Short-course Astronomical Research Seminars for High School and College Students  

NASA Astrophysics Data System (ADS)

Since 2008, I have helped lead several short-course astronomical research seminars with Russell M. Genet. These seminars have ranged from semester-long courses at Cuesta College in San Luis Obispo, California to long weekends at the University of Oregon's Pine Mountain Observatory. Each seminar is led by an experienced observer or group of observers who guide high school and college students through the scientific process from observations to publication. The students (anywhere from half a dozen to twenty in number) participate in and contribute to every step. Being a coauthor on one or more research papers offers students an advantage on college and scholarship applications. Similarly, graduate schools often prefer students with research experience. Many topics of research are appropriate for these short-courses including variable star, exoplanet, and asteroid photometry. However, the most successful topic has been visual double stars because the observations required are straitforward and the equipment is relatively inexpensive. The Journal of Double Star Observations is also welcoming of student research and provides swift publication. A detailed description of the short-course seminars can be found in the recent Collins Foundation Press volume titled Small Telescopes and Astronomical Research.

Johnson, Jolyon

2011-05-01

357

High-throughput sequencing of Medicago truncatula short RNAs identifies eight new miRNA families  

PubMed Central

Background High-throughput sequencing technology is capable to identify novel short RNAs in plant species. We used Solexa sequencing to find new microRNAs in one of the model legume species, barrel medic (Medicago truncatula). Results 3,948,871 reads were obtained from two separate short RNA libraries generated from total RNA extracted from M. truncatula leaves, representing 1,563,959 distinct sequences. 2,168,937 reads were mapped to the available M. truncatula genome corresponding to 619,175 distinct sequences. 174,504 reads representing 25 conserved miRNA families showed perfect matches to known miRNAs. We also identified 26 novel miRNA candidates that were potentially generated from 32 loci. Nine of these loci produced eight distinct sequences, for which the miRNA* sequences were also sequenced. These sequences were not described in other plant species and accumulation of these eight novel miRNAs was confirmed by Northern blot analysis. Potential target genes were predicted for most conserved and novel miRNAs. Conclusion Deep sequencing of short RNAs from M. truncatula leaves identified eight new miRNAs indicating that specific miRNAs exist in legume species. PMID:19068109

Szittya, Gyorgy; Moxon, Simon; Santos, Dulce M; Jing, Runchun; Fevereiro, Manuel PS; Moulton, Vincent; Dalmay, Tamas

2008-01-01

358

An exploratory analysis of communication sources: targeting high risk behavior among injection drug users.  

PubMed

Currently, most AIDS education and prevention programs attempt to change the high risk behavior of injection drug users (IDU's) (e.g., sharing needles and engaging in unsafe sex) through the implementation of two distinct strategies. First, empirical-rational strategies suggest that people maximize their rational self-interest. Second, normative re-education strategies suggest that people change their individual behavior when they believe that there has been change in the sociocultural norms, values, and habits around them. Both of these strategies make assumptions about how communication changes IDU's beliefs and behavior. An empirical-rational strategy emphasizes non-personal mass communications (e.g., television, radio, newspaper); while normative re-education strategies make use of personal communications (e.g. friends, family, educational outreach workers, and group discussion). The purpose of this paper is to compare these strategies by examining the impact of AIDS communication sources on the beliefs and behaviors of IDU's. PMID:10172894

Bodkin, C D; La Salvia, T A

1996-01-01

359

Communications Strategies on Alcohol and Highway Safety. Volume II. High School Youth. Final Report.  

ERIC Educational Resources Information Center

The second part of a two-part, two volume study deals with high school youth and identifies target populations and communications strategies for encouraging personal action steps to prevent drunk driving. Data, collected from interviews and questionnaires, are summarized and presented in tabular form. One fourth of high schoolers in a

Grey Advertising, Inc., New York, NY.

360

A new high intensity and short-pulse molecular beam valve.  

PubMed

In this paper, we report on the design and performance of a new home-built pulsed gas valve, which we refer to as the Nijmegen Pulsed Valve (NPV). The main output characteristics include a short pulse width (as short as 20 ?s) combined with operating rates up to 30 Hz. The operation principle of the NPV is based on the Lorentz force created by a pulsed current passing through an aluminum strip located within a magnetic field, which opens the nozzle periodically. The amplitude of displacement of the opening mechanism is sufficient to allow the use of nozzles with up to 1.0 mm diameter. To investigate the performance of the valve, several characterizations were performed with different experimental methods. First, a fast ionization gauge was used to measure the beam intensity of the free jet emanating from the NPV. We compare free jets from the NPV with those from several other pulsed valves in current use in our laboratory. Results showed that a high intensity and short pulse-length beam could be generated by the new valve. Second, the NPV was tested in combination with a skimmer, where resonance enhanced multiphoton ionization combined with velocity map imaging was used to show that the NPV was able to produce a pulsed molecular beam with short pulse duration (~20 ?s using 0.1% NO/He at 6 bars) and low rotational temperature (~1 K using 0.5% NO/Ar at 6 bars). Third, a novel two-point pump-probe method was employed which we label double delay scan. This method allows a full kinematic characterization of the molecular beam, including accurate speed ratios at different temporal positions. It was found that the speed ratio was maximum (S = 50 using 0.1% NO/He at 3 bars) at the peak position of the molecular beam and decreased when it was on the leading or falling edge. PMID:23464190

Yan, B; Claus, P F H; van Oorschot, B G M; Gerritsen, L; Eppink, A T J B; van de Meerakker, S Y T; Parker, D H

2013-02-01

361

Interplay of mulitphoton and tunneling ionization in short-wavelength-driven high-order harmonic generation  

SciTech Connect

High-order harmonic generation efficiency is theoretically modeled and compared with experiments using 400 and 800 nm driver pulses. It is shown that, for a short drive wavelength and a Keldysh parameter larger than 1, the Ammosov-Delone-Krainov (ADK) ionization model does not give a good agreement between theory and experiment. Since the ADK ionization model only accounts for tunnel ionization, it underestimates the yield of low-order harmonics from the wings of the driver pulse. In contrast, the Yudin-Ivanov ionization model [Phys. Rev. A 64, 013409 (2001)], which accounts for both tunnel and multiphoton ionization, gives much better agreement with the experimental results.

Gkortsas, Vasileios-Marios; Bhardwaj, Siddharth; Lai, Chien-Jen; Hong, Kyung-Han [Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Falcao-Filho, Edilson L. [Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901, Recife, Pernambuco (Brazil); Kaertner, Franz X. [Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); DESY-Center for Free-Electron Laser Science and Hamburg University, 22607 Hamburg (Germany)

2011-07-15

362

ORIGINAL COMMUNICATION High-throughput classification of clinical populations  

E-print Network

participants simply watched television while we recorded their eye movements. We combined eye- tracking data.2 %), and ADHD versus FASD versus control children with 77.3 % accuracy (chance 40.4 %). Our technique provides deployed, low-cost, and high-throughput for clinical disor- ders, especially in young children and elderly

Munoz, Douglas Perry

363

Broadband communications from a high-altitude platform  

Microsoft Academic Search

In the present climate of growth in bandwidth-hungry telecommunication applications, wireless infrastructure providers are under continuous pressure to exploit the limited radio spectrum as efficiently as possible. In this context, high-altitude platforms (HAPs) are increasingly being cited as having an important role to play in future systems and applications. They have the potential to exploit many of the best aspects

J. Thornton; D. Grace; C. Spillard; T. Konefal

364

High Efficiency Power Combining of Ka-Band TWTs for High Data Rate Communications  

NASA Technical Reports Server (NTRS)

Future NASA deep space exploration missions are expected in some cases to require telecommunication systems capable of operating at very high data rates (potentially 1 Gbps or more) for the transmission back to Earth of large volumes of scientific data, which means high frequency transmitters with large bandwidth. Among the Ka band frequencies of interest are the present 500 MHz Deep Space Network (DSN) band of 31.8 to 32.3 GHz and a broader band at 37-38 GHz allocated for space science [1]. The large distances and use of practical antenna sizes dictate the need for high transmitter power of up to 1 kW or more. High electrical efficiency is also a requirement. The approach investigated by NASA GRC is a novel wave guide power combiner architecture based on a hybrid magic-T junction for combining the power output from multiple TWTs [1,2]. This architecture was successfully demonstrated and is capable of both high efficiency (90-95%, depending on frequency) and high data rate transmission (up to 622 Mbps) in a two-way power combiner circuit for two different pairs of Ka band TWTs at two different frequency bands. One pair of TWTs, tested over a frequency range of 29.1 to 29.6 GHz, consisted of two 110-115W TWTs previously used in uplink data transmission evaluation terminals in the NASA Advanced Communications Technology Satellite (ACTS) program [1,2]. The second pair was two 100W TWTs (Boeing 999H) designed for high efficiency operation (greater than 55%) over the DSN frequency band of 31.8 to 32.3 GHz [3]. The presentation will provide a qualitative description of the wave guide circuit, results for power combining and data transmission measurements, and results of computer modeling of the magic-T and alternative hybrid junctions for improvements in efficiency and power handling capability. The power combiner results presented here are relevant not only to NASA deep space exploration missions, but also to other U.S. Government agency programs.

Wintucky, E. G.; Simons, R. N.; Vaden, K. R.; Lesny, G. G.; Glass, J. L.

2006-01-01

365

Phase transitions in ceramic oxides as the result of processes with short time high temperature action  

SciTech Connect

Different materials belonging to two groups based on Al{sub 2}O{sub 3} and ZrO{sub 2} have been studied. These materials are applied as components of high temperature resistant protective coatings particularly in thermal barrier coating deposited by plasma spraying process and studied on thermal shock resistance with the use of a special arrangement. Both processes are characterised by short time high temperature action and subsequent high cooling rate which causes phase transitions in the studied materials. In the first group of materials based on Al{sub 2}O{sub 3} two forms of {beta}-Al{sub 2}TiO{sub 5} obtained by annealing in furnace and plasma spraying have been compared. In the second group of materials based on ZrO{sub 2} special attention is directed to materials stabilized by rare earth oxides and phase transitions occuring in the dependence on composition and processing.

Gorski, L. [Institute of Atomic Energy, Swierk-Otwock (Poland)

1995-09-01

366

Surface damage analysis of retrieved highly crosslinked polyethylene tibial components after short-term implantation.  

PubMed

The use of highly crosslinked polyethylene (PE) in the knee remains controversial, because of reduced fatigue fracture properties of the material. The current study investigated postmelt surface damage as well as potential contributors to this damage in retrieved highly crosslinked PE tibial components, after short-term in vivo durations. Retrieved conventional PE tibial components were examined for comparison, as well as unused time zero highly crosslinked and conventional PE tibial components for inherent manufacturing surface characterization. Predominant surface damage modes on highly crosslinked PE components were machine mark loss and abrasion, while conventional PE components primarily had machine mark loss, abrasion, and delamination. In vivo duration, PE thickness, and conformity of the design were significant predictors of surface damage on retrieved conventional PE components. Donor weight and the conformity of the design were significant predictors of surface damage on retrieved highly crosslinked PE components. This retrieval data on highly crosslinked PE tibial components suggest that in vivo wear occurred, observed as postmelt surface damage. The highly crosslinked Durasul material examined in this retrieval study appeared to outperform the conventional PE components made from 4150 resin, ram-extruded and gamma-sterilized in air, but not the conventional components made from 1020 resin, compression molding and gamma sterilization in nitrogen. Early retrieval data of highly crosslinked PE tibial components are important to serve as a benchmark to be compared with future longer-term retrieval studies investigating whether surface damage translates to clinically relevant particulate wear debris generation and PE clinical performance. PMID:17806108

Willie, B M; Foot, L J; Prall, M W; Bloebaum, R D

2008-04-01

367

ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510  

SciTech Connect

Long-lived high-energy (>100 MeV) emission, a common feature of most Fermi-LAT-detected gamma-ray burst, is detected up to {approx}10{sup 2} s in the short GRB 090510. We study the origin of this long-lived high-energy emission, using broadband observations including X-ray and optical data. We confirm that the late >100 MeV, X-ray, and optical emission can be naturally explained via synchrotron emission from an adiabatic forward shock propagating into a homogeneous ambient medium with low number density. The Klein-Nishina effects are found to be significant, and effects due to jet spreading and magnetic field amplification in the shock appear to be required. Under the constraints from the low-energy observations, the adiabatic forward shock synchrotron emission is consistent with the later-time (t {approx}> 2 s) high-energy emission, but falls below the early-time (t < 2 s) high-energy emission. Thus we argue that an extra high-energy component is needed at early times. A standard reverse-shock origin is found to be inconsistent with this extra component. Therefore, we attribute the early part of the high-energy emission (t {approx}< 2 s) to the prompt component, and the long-lived high-energy emission (t {approx}> 2 s) to the adiabatic forward shock synchrotron afterglow radiation. This avoids the requirement for an extremely high initial Lorentz factor.

He Haoning; Wang Xiangyu [Department of Astronomy, Nanjing University, Nanjing 210093 (China); Wu Xuefeng; Toma, Kenji; Meszaros, Peter [Department of Astronomy and Astrophysics, Department of Physics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)

2011-05-20

368

VERY HIGH-SPEED DRILL STRING COMMUNICATIONS NETWORK  

SciTech Connect

Testing of recent upgrades to the drill pipe telemetry system in a 1000-ft vertical well has shown that the new system can achieve at least 1,000 ft passive transmission distance with sufficient bandwidth to accommodate a digital transmission rate of 2 Mbit/sec. Digitized data from a module at the bottom of the well has been successfully transmitted through the transmission line to the top of the well for a period of approximately one month. Manufacture of 30 prototype range 2 drill pipes has demonstrated greater simplicity of manufacturing and greater consistency of electrical characteristics from part to part, as compared to the first production run previously reported. Further work is needed to improve the high pressure capability of the system and to improve the robustness of the system in a high-vibration environment.

David S. Pixton

2002-08-01

369

FAST TRACK COMMUNICATION High rate straining of tantalum and copper  

NASA Astrophysics Data System (ADS)

High strain rate measurements reported recently for several tantalum and copper crystal/polycrystal materials are shown to follow dislocation mechanics-based constitutive relations, first at lower strain rates, for dislocation velocity control of the imposed plastic deformations and, then at higher rates, transitioning to nano-scale dislocation generation control by twinning or slip. For copper, there is the possibility of added-on slip dislocation displacements to be accounted for from the newly generated dislocations.

Armstrong, R. W.; Zerilli, F. J.

2010-12-01

370

Wi-Fi in high-speed transport communications  

Microsoft Academic Search

We discuss in this paper the performance of the present Wi-Fi system in a high-speed environment where Doppler effect is taken into account. The performance is reported in both 802.11a and its future MIMO version 802.11n. Simulations are taken in use of Jakes' model in differents speeds contexts and WiFi system is found weak facing Doppler effect. In order to

2009-01-01

371

Robust and timely communication over highly dynamic sensor networks  

Microsoft Academic Search

Highly dynamic sensor networks, such as mobile robotic sensor networks, have been applied in various kinds of application scenarios such as real-time planet exploration and deep-ocean discovery. In these types of networks, mobility and energy management protocols change the connectivity among the neighboring nodes quickly. Traditional state-based protocols, designed for static and\\/or low-mobility networks, suffer excessive delay in updating their

Tian He; Brian M. Blum; Qing Cao; John A. Stankovic; Sang Hyuk Son; Tarek F. Abdelzaher

2007-01-01

372

Radiation from magnetized wakes in ultra-short high intensity laser pulse and gas jet plasma interaction  

Microsoft Academic Search

Using a gas jet flow, via the interaction between an ultra-short and high intensity laser pulse and plasma in the presence of a perpendicular external DC magnetic field, the short pulse radiation from magnetized plasma wakefields have been observed. The wakefields are excited by a mode locked Ti:sapphire laser beam. Different nozzles are used in order to generate different densities

D. Dorraman; M. Starodubtsev; H. Kawakami; H. P. Araghy; H. Ito; N. Yugami; Y. Nishida

2003-01-01

373

High-Speed Imaging of Short Wind Waves by Shape from Refraction  

NASA Astrophysics Data System (ADS)

This paper introduces the first high-speed system for slope imaging of wind-induced short water waves. The imaging slope gauge method is used, which is based on the shape from refraction principle. The downward looking camera with a telecentric lens observes the refraction of light rays coming from a high power custom telecentric LED light source that is placed underneath the wind wave facility. The light source can be programmed to arbitrary intensity gradients in the x- and y-direction, so that the origin of a light ray is coded in intensity. Four gradient images (acquired at 6000 fps) are combined for one 2D slope image. By only using intensity ratios, the measurements become independent of lens effects from the curved water surface and inhomogeneities in the light source. Independence of wave height is guaranteed by using telecentric illumination and telecentric imaging. The system is capable to measure the slopes of a wind-driven water surface in the Heidelberg Aeolotron wind-wave facility on a footprint of 200 x 160 mm with a spatial resolution of 0.22 mm and a temporal resolution of more than 1500 fps. For the first time, it is now possible to investigate the structure of short wind-induced waves with sufficient spatial and temporal resolution to study their dynamic characteristics without aliasing effects. Example images and a video of a 3D reconstructed water surface are shown to illustrate the principle.

Kiefhaber, D.; Reith, S.; Rocholz, R.; Jhne, B.

2014-03-01

374

Replacing cellular with WiFi direct communication for a highly interactive, high bandwidth multiplayer game  

E-print Network

The objective of this work is to explore the benefits of replacing cellular with Wi-Fi Direct communication in mobile applications. Cellular connections consume significant power on mobile devices and are too slow for many ...

Ortiz, Pablo (Pablo Jose)

2013-01-01

375

Space Weather effects on airline communications in the high latitude regions  

NASA Astrophysics Data System (ADS)

Efficient air traffic management depends on reliable communications between aircraft and the air traffic control centres at all times. At high latitudes, and especially on polar routing, VHF ground infrastructure does not exist and the aircraft have to rely on HF radio for communications. HF relies on reflections from the ionosphere to achieve long distance communications. Unfortunately the high latitude ionosphere is affected by space weather events. During such events HF radio communication can be severely disrupted and aircraft are forced to use longer low latitude routes with consequent increased flight time, fuel consumption and cost. This presentation describes a new research programme at the University of Lancaster in collaboration with the University of Leicester, Solar Metrics Ltd and Natural Resources Canada for the development of a nowcasting and forecasting HF communications tool designed for the particular needs of civilian airlines. This project funded by EPSRC will access a wide variety of solar and interplanetary measurements to derive a complete picture of space weather disturbances affecting radio absorption and reflection

Honary, Farideh

2014-05-01

376

Photography (Graphic Communications). Industrial Arts, Senior High--Level II. North Dakota Senior High Industrial Arts Curriculum Guides.  

ERIC Educational Resources Information Center

This course guide for a photography course is one of four developed for the graphic communications area in the North Dakota senior high industrial arts education program. (Eight other guides are available for two other areas of Industrial Arts--energy/power and production.) Part 1 provides such introductory information as a definition and

Poehls, Eddie; And Others

377

Highly-charged heavy-ion production with short pulse lasers  

SciTech Connect

This MathCAD document describes a possible approach using a PW -class short pulse laser to form a useful number (10{sup 12}) of high and uniform charge state ions with low ion temperature (<< 100 eV) and low momentum spread ({delta}p{sub z}/p, < 10{sup -4} ) for injection into heavy-ion fusion accelerators. As a specific example, we consider here Xenon{sup +26}, which has an ionization energy E{sub i} {approximately} 860 eV for the 26th electron, and a significantly higher ionization potential of 1500 eV for the 27th electron because of the M-shell jump. The approach considered here may be used for other ion species as well. The challenge is not simply to produce high charge states with a laser (the ITEP group [Sharkov] have used long pulse CO{sub 2} lasers to create many charge states of chromium up to helium-like Cr{sup +25} by collisional ionization at high Te), nor just to create such high charge states more selectively by field (tunneling) ionization at higher intensities and shorter pulses. Rather, the challenge is to create a selected uniform high charge state, in useful numbers, while keeping the ion temperature and momentum spread small, and avoiding subsequent loss of ion charge state due to recombination and charge-exchange with background gas atoms during extraction into a useful low emittance beam.

Logan, G.; Bitmire, T.; Perry, M.; Anderson, O.; Kuehl, T.

1998-01-27

378

Communication about Contraception and Knowledge of Oral Contraceptives amongst Norwegian High School Students.  

ERIC Educational Resources Information Center

Examines communication about contraception and specific knowledge of oral contraceptives (OCs) in a sample of Norwegian high school students. More females than males discussed contraception at least monthly. Discussions were predominantly held with peers and not adults. Females were far more knowledgeable about OCs than males. The most significant

Hansen, Thomas; Skjeldestad, Finn Egil

2003-01-01

379

Organizational Communication and Culture: A Study of 10 Italian High-Technology Companies.  

ERIC Educational Resources Information Center

Tests in international environments models previously developed within United States high-technology organizations. Demonstrates that relationships among organizational culture themes, employee values, organizational communication activities, and perceptions of a variety of organizational outcomes are similar but not identical for United States

Morley, Donald Dean; Shockley-Zalabak, Pamela; Cesaria, Ruggero

1997-01-01

380

High data rate multiple input multiple output (MIMO) optical wireless communications using white led lighting  

Microsoft Academic Search

Solid-state lighting is a rapidly growing area of research and applications, due to the reliability and predicted high efficiency of these devices. The white LED sources that are typically used for general illumination can also be used for data transmission, and Visible Light Communications (VLC) is a rapidly growing area of research. One of the key challenges is the limited

Lubin Zeng; Dominic C. O'Brien; Hoa Le Minh; Grahame E. Faulkner; Kyungwoo Lee; Daekwang Jung; Yunje Oh; Eun Tae Won

2009-01-01

381

The DOE Program in HPCC: High-Performance Computing and Communications.  

ERIC Educational Resources Information Center

This document reports to Congress on the progress that the Department of Energy has made in 1992 toward achieving the goals of the High Performance Computing and Communications (HPCC) program. Its second purpose is to provide a picture of the many programs administered by the Office of Scientific Computing under the auspices of the HPCC program.

Department of Energy, Washington, DC. Office of Energy Research.

382

The design of a linear L-band high power amplifier for mobile communication satellites  

NASA Technical Reports Server (NTRS)

A linear L-band solid state high power amplifier designed for the space segment of the Mobile Satellite (MSAT) mobile communication system is described. The amplifier is capable of producing 35 watts of RF power with multitone signal at an efficiency of 25 percent and with intermodulation products better than 16 dB below carrier.

Whittaker, N.; Brassard, G.; Li, E.; Goux, P.

1990-01-01

383

Valuing a high-tech growth company: the case of EchoStar Communications Corporation  

Microsoft Academic Search

This article uses real options to value a high-tech company with significant growth option potential. The case of EchoStar Communications Corporation is used as an illustration. The company's growth opportunities are modeled and valued as a portfolio of growth options, namely options to expand its pay television, equipment, and internet services. Expansion of the main business can occur geographically (in

Lenos Trigeorgis; Sophocles Ioulianou

2012-01-01

384

Communication Strategies Used by High School English Language Learners in Multilingual Classrooms  

ERIC Educational Resources Information Center

In this study, twenty-five high school English language learners were observed in their classrooms in a New York City public school while they worked in small groups. All observations were video recorded or done by the researcher while in the classrooms. The videos were then transcribed. Communication strategies that the participants used were

Spromberg, Sarah

2011-01-01

385

EMERGING AIR QUALITY MODELING TECHNOLOGY FOR HIGH PERFORMANCE COMPUTING AND COMMUNICATION ENVIRONMENTS  

EPA Science Inventory

To demonstrate applications of the HPCC technologies in air quality models, we organized the Specialty Evening Session 1, "Emerging Air Quality Modeling Technologies for High Performance Computing and Communication Environment" as a part of the Twenty First NATO/CCMS Internationa...

386

Stable Distributed Power Control with High SIR Target for Cellular Wireless Communication Systems Jiayuan Chen1  

E-print Network

Stable Distributed Power Control with High SIR Target for Cellular Wireless Communication Systems station is needed to control all the links in a cellular system. A good paper on centralized power control systems. In distributed power control (DPC), each base station controls and updates the transmitted powers

Haddadi, Hamed

387

Think, Speak, Succeed!...Applied Oral Communications Activities for High School Students.  

ERIC Educational Resources Information Center

This module contains speaking assignments for high school students that are taken from six different career areas. Each career section begins with a brief introduction to the career and a communications profile of the person interviewed. These pages can be copied and given to students as handouts. Each section also contains some assignments

Turlington, Anita; Timms, Keith

388

Supportive communication and school outcomes, Part II: Academically at?risk low income high school students  

Microsoft Academic Search

This study explores the relationship between supportive communication and school outcomes for two groups of lower socioeconomic high school students: those identified as at?risk of poor school performance and those not identified as at?risk. Results indicate that parents are major sources of social support for both groups of students; however, at?risk students also receive support from their friends.

Lawrence B. Rosenfeld; Jack M. Richman

1999-01-01

389

Linux/SimOS -A Simulation Environment for Evaluating High-Speed Communication Systems  

E-print Network

Linux/SimOS - A Simulation Environment for Evaluating High-Speed Communication Systems Chulho Won presents Linux/SimOS, a Linux operating sys- tem port to SimOS, which is a complete machine simula- tor from Stanford. The motivation for Linux/SimOS is to alleviate the limitations of SimOS, which only

Lee, Ben

390

Short-term high fat feeding increases organ injury and mortality after polymicrobial sepsis.  

PubMed

The purpose of this study was to examine the effect of short-term high fat feeding on the inflammatory response in polymicrobial sepsis. Male C57BL/6 mice at 6 weeks of age were randomized to a high-fat diet (HFD) (60% kcal fat) or control diet (CD) (16% kcal fat) for 3 weeks. After 3 weeks of feeding, sepsis was induced by cecal ligation and puncture (CLP) and animals were monitored for survival. In a separate experiment, after 3 weeks of feeding mice underwent CLP and were sacrificed at various time points thereafter. Tissue was collected for biochemical studies. Mice fed a HFD gained more weight and had a greater fat mass compared to CD-fed mice. Mice on a HFD had a lower probability of survival and more severe lung injury compared with CD-fed mice following sepsis. Myeloperoxidase (MPO) activity, an indicator of neutrophil infiltration, was increased in the lung and liver after CLP in HFD-fed mice compared with CD (P < 0.05). The plasma cytokines tumor necrosis factor-? (TNF-?) and interleukin (IL)-6 were increased in both groups after CLP, however, TNF-? and IL-6 levels were lower in HFD mice at 3 h after CLP compared with CD and consistent with lung, but not liver, messenger RNA (mRNA) expression. Leptin levels were higher in HFD-fed mice at 18 h after sepsis compared to baseline levels (P < 0.05). Polymicrobial sepsis increased hepatic nuclear factor-?B (NF-?B) activation in HFD-fed mice after CLP vs. CD-fed mice. Short duration high fat feeding increases mortality and organ injury following polymicrobial sepsis. These effects correspond to changes in NF-?B. PMID:22334256

Kaplan, Jennifer M; Nowell, Marchele; Lahni, Patrick; O'Connor, Michael P; Hake, Paul W; Zingarelli, Basilia

2012-10-01

391

Reflectivity of plasmas created by high-intensity, ultra-short laser pulses  

SciTech Connect

Experiments were performed to characterize the creation and evolution of high-temperature (T{sub e}{approximately}100eV), high-density (n{sub e}>10{sup 22}cm{sup {minus}3}) plasmas created with intense ({approximately}10{sup 12}-10{sup 16}W/cm{sup 2}), ultra-short (130fs) laser pulses. The principle diagnostic was plasma reflectivity at optical wavelengths (614nm). An array of target materials (Al, Au, Si, SiO{sub 2}) with widely differing electronic properties tested plasma behavior over a large set of initial states. Time-integrated plasma reflectivity was measured as a function of laser intensity. Space- and time-resolved reflectivity, transmission and scatter were measured with a spatial resolution of {approximately}3{mu}m and a temporal resolution of 130fs. An amplified, mode-locked dye laser system was designed to produce {approximately}3.5mJ, {approximately}130fs laser pulses to create and nonintrusively probe the plasmas. Laser prepulse was carefully controlled to suppress preionization and give unambiguous, high-density plasma results. In metals (Al and Au), it is shown analytically that linear and nonlinear inverse Bremsstrahlung absorption, resonance absorption, and vacuum heating explain time-integrated reflectivity at intensities near 10{sup 16}W/cm{sup 2}. In the insulator, SiO{sub 2}, a non-equilibrium plasma reflectivity model using tunneling ionization, Helmholtz equations, and Drude conductivity agrees with time-integrated reflectivity measurements. Moreover, a comparison of ionization and Saha equilibration rates shows that plasma formed by intense, ultra-short pulses can exist with a transient, non-equilibrium distribution of ionization states. All targets are shown to approach a common reflectivity at intensities {approximately}10{sup 16}W/cm{sup 2}, indicating a material-independent state insensitive to atomic or solid-state details.

Gold, D.M.

1994-06-01

392

On the choice of electromagnetic model for short high-intensity arcs, applied to welding  

NASA Astrophysics Data System (ADS)

We have considered four different approaches for modelling the electromagnetic fields of high-intensity electric arcs: (i) three-dimensional, (ii) two-dimensional axi-symmetric, (iii) the electric potential formulation and (iv) the magnetic field formulation. The underlying assumptions and the differences between these models are described in detail. Models (i) to (iii) reduce to the same limit for an axi-symmetric configuration with negligible radial current density, contrary to model (iv). Models (i) to (iii) were retained and implemented in the open source CFD software OpenFOAM. The simulation results were first validated against the analytic solution of an infinite electric rod. Perfect agreement was obtained for all the models tested. The electromagnetic models (i) to (iii) were then coupled with thermal fluid mechanics, and applied to axi-symmetric gas tungsten arc welding test cases with short arc (2, 3 and 5 mm) and truncated conical electrode tip. Models (i) and (ii) lead to the same simulation results, but not model (iii). Model (iii) is suited in the specific limit of long axi-symmetric arc with negligible electrode tip effect, i.e. negligible radial current density. For short axi-symmetric arc with significant electrode tip effect, the more general axi-symmetric formulation of model (ii) should instead be used.

Choquet, Isabelle; Javidi Shirvan, Alireza; Nilsson, Hkan

2012-05-01

393

Development of a 1 J short pulse tunable TEA CO2 laser with high energy stability  

NASA Astrophysics Data System (ADS)

The design, development and operational characteristics of a 1 J, repetitively pulsed, line tunable TEA CO2 laser producing nearly tail free short pulses (~170 ns) suitable for laser isotope separation is discussed. Tail free short laser pulses were generated by employing a nitrogen lean gaseous active medium. Use of an indigenously developed stable pulsed power supply, uniform and intense UV spark pre-ionization and optimum gas purging with catalytic regeneration to control the deleterious oxygen accumulation helps generate laser pulses with high energy stability. Integration of a sensitive arc detection system allows long term arc-free operation of the laser and protects it from catastrophic failure. Laser pulses in more than 90 lines in 10.6 ?m and 9.6 ?m bands of CO2 laser spectrum with energy about 1 J in as many as 50 lines could be generated with a typical efficiency of about 4%. A typical pulse to pulse energy stability of 1.4% was obtained during one hour of continuous operation of the TEA CO2 laser at 75 Hz.

Kumar, Manoj; Reghu, T.; Biswas, A. K.; Bhargav, Pankaj; Pakhare, J. S.; Kumar, Shailesh; Verma, Abrat; Mandloi, Vagesh; Kukreja, L. M.

2014-12-01

394

Temporal widening of a short polarized pulse focused with a high numerical aperture aplanatic lens.  

PubMed

We present a theoretical analysis of the field distribution in the focal plane of a dispersionless, high numerical aperture (NA) aplanatic lens for an x-polarized short pulse. We compare the focused pulse spatial distribution with that of a focused continuous wave (CW) field and its temporal distribution with the profile of the incident pulse. Regardless of the aberration free nature of the focusing aplanatic lens, the temporal width of the focused pulse widens considerably for incident pulses with durations on the order of a few cycles due to the frequency-dependent nature of diffraction phenomena, which imposes a temporal diffraction limit for focused short pulses. The spatial distribution of the focused pulse is also affected by this dependence and is altered with respect to the diffraction limited distribution of the CW incident field. We have analyzed pulses with flat top and Gaussian spatial irradiance profiles and found that the focused pulse temporal widening is less for the Gaussian spatial irradiance pulse, whereas the spatial distribution variation is similar in both cases. We present results of the focused pulsewidth as a function of the NA for the two spatial irradiance distributions, which show that the Gaussian irradiance pulse outperforms the flat top pulse at preserving the incident pulse duration. PMID:24695130

Rodrguez-Herrera, O G; Rosete-Aguilar, M; Bruce, N C; Garduo-Meja, J

2014-04-01

395

Short duration-high area regular dialysis using two UF 2 coils in series.  

PubMed

To increase the number of regular dialysis patients without increasing apparatus, staff or buildings, short time-high area dialysis was undertaken for 3.5 h twice a week or 3 h three times a week with two UF 2 coils in series (2 m2) with dialysis fluid flow of 300 ml/min/kidney in parallel. The biochemical and clinical results were compared with those obtained in a period immediately prior to this using conventional 7-hours dialysis twice a week or 6 h three times a week on UF 145. Urea, creatinine and vitamin B12 clearances, predialysis blood urea and creatinine levels and the clinical state of the patients were satisfactory on short double UF 2 coil in series dialysis. Addition of 1-1.5 liters of saline during dialysis permitted an average net fall in body weight of 1 kg without cramps or hypotension. The merits of rapid dialysis with a large area dialyzer are discussed. PMID:1244567

Ari, J B; Oren, A; Berlyne, G M

1976-01-01

396

Short Communication Predator and scavenger aggregation to discarded by-catch from dredge fisheries: importance of damage level  

Microsoft Academic Search

Predator and scavenger aggregation to simulated discards from a scallop dredge fishery was investigated in the north Irish Sea using an in situ underwater video to determine differences in the response to varying levels of discard damage. The rate and magnitude of scavenger and predator aggregation was assessed using three different types of bait, undamaged, lightly damaged and highly damaged

C. Mullen; A. R. Brand; Citadel Hill

397

Communication Systems at Millimeter Waves  

Microsoft Academic Search

The technical advantages of mm-waves for short range and high data rate radio communications are well known: The availability of bandwidth, the robustness against interception and jamming, and the possibility of repeated frequence reuse after considerably small distances given by a high basic path attenuation and by certain propagation limits of atmosphere. Otherwise some unsolved problems are existing, which hinder

B. Rembold

1992-01-01

398

High energy colliders as black hole factories: The end of short distance physics  

NASA Astrophysics Data System (ADS)

If the fundamental Planck scale is of order of a TeV, as is the case in some extra-dimension scenarios, future hadron colliders such as the CERN Large Hadron Collider will be black hole factories. The nonperturbative process of black hole formation and decay by Hawking evaporation gives rise to spectacular events with up to many dozens of relatively hard jets and leptons with a characteristic ratio of hadronic to leptonic activity of roughly 5:1. The total transverse energy of such events is typically a sizable fraction of the beam energy. Perturbative hard scattering processes at energies well above the Planck scale are cloaked behind a horizon, thus limiting the ability to probe short distances. The high energy black hole cross section grows with energy at a rate determined by the dimensionality and geometry of the extra dimensions. This dependence therefore probes the extra dimensions at distances larger than the Planck scale.

Giddings, Steven B.; Thomas, Scott

2002-03-01

399

Study of short haul high-density V/STOL transportation systems, volume 1  

NASA Technical Reports Server (NTRS)

The relative advantages of STOL aircraft concepts were examined by simulating the operations of a short haul high-density intercity STOL system set in two arenas, the California corridor and the Chicago-Detroit-Cleveland triangle, during the 1980 time period. The study was constrained to the use of three aircraft concepts designated as the deflected slipstream turboprop, externally blown flap, and augmentor wing turbofan configurations. The projected demographic, economic, travel demand, and travel characteristics of the representative arenas were identified. The STOL airline operating scenarios were then formulated and through the use of the aerospace modal split simulation program, the traveler modal choices involving alternative STOL concepts were estimated in the context of the total transportation environment for 1980. System combinations that presented the best potential for economic return and traveler acceptance were then identified for each STOL concept.

Solomon, H. L.

1972-01-01

400

High-intensity, short pulse (1 ps), laser-plasma interaction at 1 um  

NASA Astrophysics Data System (ADS)

We present studies of high-intensity laser-plasma interactions using a 1-ps, 1.053-pm laser. It is currenily operated in a single-pulse mode with energies up to -100 mJ and focused intensities up to mid-1015 W/cm2. We have measured the absorption of laser light in plasmas produced during interactions with various moderate targets using an Ulbricht's sphere. Charge collectors were used to study the characteristics of the ion expansion. X-ray and XUV spectroscopy were used to measure the spectral emission from the plasmas. These results are compared to 1-D hydrodynamic code (LILAC) simulations. LILAC has been modified to improve its validity for short-pulse interactions but it is still found that the absorption is underestimated. Potential explanations, including suprathermal electron generation, are discussed.

Meyerhofer, David D.; Chen, Hong; Chuang, Yung-Ho; Delettrez, J. A.; Epstein, R.; Uchida, S.; Yaakobi, Barukh

1990-05-01

401

Phosphide based Molecular Beam Epitaxy for High Power Short-Wavelength Diode Lasers  

NASA Astrophysics Data System (ADS)

The paper presents our recent results obtained in developing highpower GaInP/AlGaInP quantum well laser diodes for the short red-wavelength range. State-of-the-art performances have been obtained at 650nm (bright red) with high-power, in excess of 2W under continuous wave operation, emitted at 15C. The emission wavelength was also brought down to 618nm, close to the shortest achievable wavelength with the AlGaInP material system. Our calculations and preliminary tests indicate that a significant increase of the emitted power and substantial reduction of the emission wavelength down to the amber 600nm range can be obtained by using advanced layer structures and more complex doping profiles.

Toikkanen, L.; Tukiainen, A.; Dumitrescu, M.; Viitala, S.; Rimpilinen, V.; Hirvonen, I.; Pessa, M.

2004-01-01

402

High power, short pulses ultraviolet laser for the development of a new x-ray laser  

SciTech Connect

A high power, short pulse ultraviolet laser system (Powerful Picosecond-Laser) has been developed at the Princeton Plasma Physics Laboratory (PPPL) as part of experiments designed to generate shorter wavelength x-ray lasers. With the addition of pulse compression and a final KrF amplifier the laser output is expected to have reached 1/3-1/2 TW (10/sup 12/ watts) levels. The laser system, particularly the final amplifier, is described along with some initial soft x-ray spectra from laser-target experiments. The front end of the PP-Laser provides an output of 20--30 GW (10/sup 9/ watts) and can be focussed to intensities of /approximately/10/sup 16/ W/cm/sup 2/. Experiments using this output to examine the effects of a prepulse on laser-target interaction are described. 19 refs., 14 figs.

Meixler, L.; Nam, C.H.; Robinson, J.; Tighe, W.; Krushelnick, K.; Suckewer, S.; Goldhar, J.; Seely, J.; Feldman, U.

1989-04-01

403

Short communication: the importance of psychosocial factors in understanding child distress during routine X-ray procedures.  

PubMed

Thirty-eight children, aged 1-4 years, with a query or definite diagnosis of congenital heart disease (CHD) were observed during an X-ray procedure and their behaviour rated on an amended version of the Observational Scale of Behavioural Distress. Families were followed up and assessed on a number of psychosocial variables. High rates of behavioural distress were found to be associated with children's low stranger sociability and parental style of discipline. Possible patterns of interaction between CHD children and their families are discussed. PMID:2246345

Bradford, R

1990-09-01

404

An overview of LLNL high-energy short-pulse technology for advanced radiography of laser fusion experiments  

NASA Astrophysics Data System (ADS)

The technical challenges and motivations for high-energy, short-pulse generation with NIF and possibly other large-scale Nd : glass lasers are reviewed. High-energy short-pulse generation (multi-kilojoule, picosecond pulses) will be possible via the adaptation of chirped pulse amplification laser techniques on NIF. Development of metre-scale, high-efficiency, high-damage-threshold final optics is a key technical challenge. In addition, deployment of high energy petawatt (HEPW) pulses on NIF is constrained by existing laser infrastructure and requires new, compact compressor designs and short-pulse, fibre-based, seed-laser systems. The key motivations for HEPW pulses on NIF is briefly outlined and includes high-energy, x-ray radiography, proton beam radiography, proton isochoric heating and tests of the fast ignitor concept for inertial confinement fusion.

Barty, C. P. J.; Key, M.; Britten, J.; Beach, R.; Beer, G.; Brown, C.; Bryan, S.; Caird, J.; Carlson, T.; Crane, J.; Dawson, J.; Erlandson, A. C.; Fittinghoff, D.; Hermann, M.; Hoaglan, C.; Iyer, A.; Jones, L., II; Jovanovic, I.; Komashko, A.; Landen, O.; Liao, Z.; Molander, W.; Mitchell, S.; Moses, E.; Nielsen, N.; Nguyen, H.-H.; Nissen, J.; Payne, S.; Pennington, D.; Risinger, L.; Rushford, M.; Skulina, K.; Spaeth, M.; Stuart, B.; Tietbohl, G.; Wattellier, B.

2004-12-01

405

Short communication: Farm and socioeconomic characteristics of the top 100 dairy farm counties in the United States.  

PubMed

The objectives of this study are to describe dairy farm demographic and socioeconomic conditions in the top 100 counties in the United States for dairy sales in 2007, and to describe the association of dairy farm demographics with socioeconomic conditions. The top 100 counties were responsible for 56% of all US dairy sales in 2007 with a median growth rate of 78% compared with 1997. Counties varied widely for farm demographics with as few as 5 very large dairy farms that averaged $17,924,000 in dairy sales per farm to as many as 1,730 dairy farms with less than $250,000 in dairy sales per farm. Most of the top 100 dairy counties had higher illiteracy rates, a higher proportion of residents without a high school degree, and lower median incomes than state averages, but unemployment rates were similar to the state average. The socioeconomic measures were from public records and not collected specifically for this research. Nevertheless, the top dairy counties in the western states tended to have poorer socioeconomic conditions than the top dairy counties in other regions, and significant associations were observed between dairy farm demographics and socioeconomic conditions. Having many dairy farms was associated more favorably with county socioeconomic conditions than having high dairy sales. PMID:21605767

Dechow, C D

2011-06-01

406

Partial genome analysis of Siberian sturgeon alloherpesvirus suggests its close relation to AciHV-2 - short communication.  

PubMed

Partial genome sequence of a herpes-like virus, isolated from Siberian sturgeon (Acipenser baeri), was determined and subjected to phylogenetic analysis. The virus (SbSHV) has been shown to be the causative agent of an acute disease with high mortality in farmed juvenile sturgeons in Russia. Two fragments (of 7000 and 300 base pairs in length) encompassing 3 complete and 3 partial ORFs were amplified by PCR. Sturgeon herpesvirus strains, classified into species Acipenserid herpesvirus 2 (AciHV-2), have been isolated and partially sequenced from several regions (California, Idaho, Oregon and Canada) of North America from white (A. transmontanus) and shortnose sturgeons (A. brevirostrum). The sequence of the SbSHV strain shared highest identity with that of the Canadian strain originating from shortnose sturgeon. The phylogenetic analysis also confirmed that SbSHV is closely related to AciHV-2 and could also be classified into this virus species. This is the first report on the occurrence of AciHV-2 in Europe. Previously, only another virus species, AciHV-1 has been detected in farmed white sturgeons in Italy. The size and position of ORFs in the examined gene block confirmed that this genomic region is highly conserved in members of the genus Ictalurivirus. PMID:20460226

Doszpoly, Andor; Shchelkunov, Igor S

2010-06-01

407

Improving communication and social support for caregivers of high-risk infants through mobile technologies  

Microsoft Academic Search

Upon leaving the hospital, parents of high-risk infants experience a variety of challenges in providing care at home. In this work, we present results from a qualitative study to understand the role of social interaction and information-sharing surrounding high-risk infants among both home caregivers and health professionals. These results demonstrate challenges in communication and social support for caregivers of these

Leslie S. Liu; Sen H. Hirano; Monica Tentori; Karen G. Cheng; Sheba George; Sun Young Park; Gillian R. Hayes

2011-01-01

408

High-power 0.87-micron channel substrate planar lasers for spaceborne communications  

NASA Technical Reports Server (NTRS)

High-power single-mode channeled-substrate planar AlGaAs diode lasers are being developed for reliable high-power operation for use as sources in spaceborne optical communication systems. The CSP laser structure has been optimized for operation at an emission wavelength of 870 nm. Such devices have exhibited output powers in excess of 80 mW CW at an operating temperature of 80 C.

Connolly, J. C.; Stewart, T. R.; Gilbert, D. B.; Slavin, S. E.; Carlin, D. B.

1988-01-01

409

Influence of Ramadan Fasting on Anaerobic Performance and Recovery Following Short time High Intensity Exercise  

PubMed Central

The aim of this study was to investigate the effects of Ramadan fasting on anaerobic power and capacity and the removal rate of lactate after short time high intensity exercise in power athletes. Ten male elite power athletes (2 wrestlers, 7 sprinters and 1 thrower, aged 20-24 yr, mean age 22.30 1.25 yr) participated in this study. The subjects were tested three times [3 days before the beginning of Ramadan (Pre-RF), the last 3 days of Ramadan (End-RF) and the last 3 days of the 4th week after the end of Ramadan (After-RF)]. Anaerobic power and capacity were measured by using the Wingate Anaerobic Test (WAnT) at Pre-RF, End-RF and After- RF. Capillary blood samples for lactate analyses and heart rate recordings were taken at rest, immediately after WAnT and throughout the recovery period. Repeated measures of ANOVA indicated that there were no significant changes in body weight, body mass index, fat free mass, percentage of body fat, daily sleeping time and daily caloric intake associated with Ramadan fasting. No significant changes were found in total body water either, but urinary density measured at End-RF was significantly higher than After-RF. Similarity among peak HR and peak LA values at Pre-RF, End- RF and After-RF demonstrated that cardiovascular and metabolic stress caused by WAnT was not affected by Ramadan fasting. In addition, no influence of Ramadan fasting on anaerobic power and capacity and removal rate of LA from blood following high intensity exercise was observed. The results of this study revealed that if strength-power training is performed regularly and daily food intake, body fluid balance and daily sleeping time are maintained as before Ramadan, Ramadan fasting will not have adverse effects on body composition, anaerobic power and capacity, and LA metabolism during and after high intensity exercise in power athletes. Key pointsNo significant changes were assessed on body composition, daily sleeping time and caloric intake, and body fluid balance in regularly trained power athletes during Ramadan fasting.Ramadan fasting has no adverse effect on power outputs of short time high intensity exercise.No influence of Ramadan fasting on LA metabolism during high intensity exercise and passive recovery in regularly trained power athletes. PMID:24149483

Karli, Umid; Guvenc, Alpay; Aslan, Alper; Hazir, Tahir; Acikada, Caner

2007-01-01

410

Short Communication Cross-species transferability of eastern white pine (Pinus strobus) nuclear microsatellite markers to five Mexican white pines.  

PubMed

We examined cross-species transferability and usefulness of six nuclear microsatellite markers developed in consubgeneric eastern white pine (Pinus strobus) with regard to ecologically and commercially important Mexican white pine species of conservation genetics concern: Pinus chiapensis (Mart.) Andresen, P. flexilis James, P. strobiformis Engelm., P. ayacahuite Ehrenb. Ex Schltdl, and P. ayacahuite var. veitchii (Roezl) G.R. Shaw. Four to six microsatellite loci were found to be polymorphic in different species, with moderate to high informativeness in a relatively small number of samples (PIC/HE = 0.25-0.93). This successful transfer sidesteps the time- and resource-consuming development of species-specific microsatellite markers, and will facilitate population and conservation genetic studies and genetic resource management of the less studied Mexican white pines. PMID:25222257

Villalobos-Armbula, A R; Prez de la Rosa, J A; Arias, A; Rajora, O P

2014-01-01

411

High-precision photometry by telescope defocussing. VII. The ultra-short period planet WASP-103  

E-print Network

We present 17 transit light curves of the ultra-short period planetary system WASP-103, a strong candidate for the detection of tidally-induced orbital decay. We use these to establish a high-precision reference epoch for transit timing studies. The time of the reference transit midpoint is now measured to an accuracy of 4.8s, versus 67.4s in the discovery paper, aiding future searches for orbital decay. With the help of published spectroscopic measurements and theoretical stellar models, we determine the physical properties of the system to high precision and present a detailed error budget for these calculations. The planet has a Roche lobe filling factor of 0.58, leading to a significant asphericity; we correct its measured mass and mean density for this phenomenon. A high-resolution Lucky Imaging observation shows no evidence for faint stars close enough to contaminate the point spread function of WASP-103. Our data were obtained in the Bessell $RI$ and the SDSS $griz$ passbands and yield a larger planet ...

Southworth, John; Ciceri, S; Budaj, J; Dominik, M; Jaimes, R Figuera; Haugbolle, T; Jorgensen, U G; Popovas, A; Rabus, M; Rahvar, S; von Essen, C; Schmidt, R W; Wertz, O; Alsubai, K A; Bozza, V; Bramich, D M; Novati, S Calchi; D'Ago, G; Hinse, T C; Henning, Th; Hundertmark, M; Juncher, D; Korhonen, H; Skottfelt, J; Snodgrass, C; Starkey, D; Surdej, J

2014-01-01

412

High-cost, high-capacity backbone for global brain communication  

E-print Network

March 3, 2012) Network studies of human brain structural connectivity have identified a specific set-capacity backbone for global brain communication. connectome | graph | tractography Integrative brain function nodes), the human connectome (1�3). A large proportion of cortico-cortical axonal connections link

Pillow, Jonathan

413

Short Communication: Anti-HIV-1 Envelope Immunoglobulin Gs in Blood and Cervicovaginal Samples of Beninese Commercial Sex Workers.  

PubMed

Abstract Characterization of the immune correlates of protection against HIV infection is crucial for the development of preventive strategies. This study examined HIV-1 envelope (Env) glycoproteins, specifically immunoglobulin G (IgG), in systemic and mucosal compartments of female Beninese commercial sex workers (CSWs). Samples of 23 HIV-1-positive and 20 highly exposed HIV-1-seronegative (HESN) CSWs were studied. HIV-1 Env-specific IgG detection in sera and cervicovaginal lavages (CVLs) from the study population was done by cell-based ELISA. The HIV neutralizing activity was evaluated with a neutralization assay. The HIV-1-specific antibody-dependent cellular cytotoxicity (ADCC) response of the cohort was measured with a FACS-based assay evaluating the ADCC-mediated elimination of gp120-coated target cells. No anti-HIV-1 Env-specific IgG neutralizing or ADCC activities were detected in samples from HESN CSWs. Samples from HIV-1-infected CSWs presented ADCC activity in both sera and CVLs. Anti-Env IgG from sera and CVLs from HIV-1-infected CSWs preferentially recognized Env in its CD4-bound conformation. HIV-1-infected CSWs have ADCC-mediating IgG that preferentially recognizes Env in its CD4-bound conformation at the mucosal site. PMID:25354025

Batraville, Laurie-Anne; Richard, Jonathan; Veillette, Maxime; Labb, Annie-Claude; Alary, Michel; Gudou, Fernand; Kaufmann, Daniel E; Poudrier, Johanne; Finzi, Andrs; Roger, Michel

2014-11-01

414

Efficient Service Delivery for High-speed Railway Communications Using MIMO and Access Control Technique  

NASA Astrophysics Data System (ADS)

In order to realize the notion of "anytime, anywhere" communication for high-speed train passengers, the Long Term Evolution for Railway is designed to provide broadband accesses and reliable communications for high-speed train passengers. However, with the increase of train speed, the system is subject to high bit error rate, Doppler frequency shift, and call drops. This paper is trying to solve these problems by employing the Multiple-Input Multiple-Output technique and access control schemes. The goal is to provide higher quality of services such as data rate, reliability, and delay for train passengers. Physical layer performance analysis and access control schemes are proposed in a two-hop model. Handovers and service types are also considered. Simulation results show that proposed models and schemes perform better in improving the quality of services.

Zhou, Yuzhe; Ai, Bo

2014-07-01

415

High-volume optical vortex multiplexing and de-multiplexing for free-space optical communication.  

PubMed

We report an approach to the increase of signal channels in free-space optical communication based on composed optical vortices (OVs). In the encoding process, conventional algorithm employed for the generation of collinearly superimposed OVs is combined with a genetic algorithm to achieve high-volume OV multiplexing. At the receiver end, a novel Dammann vortex grating is used to analyze the multihelix beams with a large number of OVs. We experimentally demonstrate a digitized system which is capable of transmitting and receiving 16 OV channels simultaneously. This system is expected to be compatible with a high-speed OV multiplexing technique, with potentials to extremely high-volume information density in OV communication. PMID:21263588

Wang, Zhongxi; Zhang, N; Yuan, X-C

2011-01-17

416

Short communication: survival, growth to weaning, and subsequent fertility of live-born dairy heifers after a difficult birth.  

PubMed

The experience of a difficult birth (dystocia) is traumatic and has adverse effects on the newborn in various species. Despite affecting up to 1 in 3 births in dairy cattle, studies on calves have been mostly limited to the first day of life. The objective of this study was to investigate the effects of dystocia on the survival to calving, growth to weaning, and subsequent fertility as nulliparous animals. Historical data from live-born Holstein heifer calves born from cows with various birth difficulty scores (no assistance; moderate; high difficulty) were obtained from 2 herds (Edinburgh herd: n=1,237; Crichton Royal Farm herd: n=721). Each herd was analyzed separately for birth weights, weaning weights, growth rate to weaning, number of services to conception, and age at first calving using REML and generalized linear mixed model analyses. Survival analysis (Cox proportional hazards model) was used in the Edinburgh herd to analyze the subsequent survival of live-born heifers, whereas descriptive data are presented for the Crichton Royal Farm herd. A higher mortality risk to weaning and to first service was observed in the live-born heifers that experienced moderate difficulty at birth compared with heifers born naturally. Surviving dystocial heifers had similar growth-to-weaning and fertility performance as heifers born naturally in both herds. It could be that the performance of dystocial heifers that survived to weaning was not affected or that it was compensated for by farm management. This study highlights long-term effects of the early experience of a difficult birth and thereby stresses the importance of preventing dystocia not just from the point of view of the adult cow, but also from the perspective of the calf. This would also improve farm efficiency and calf welfare. PMID:22939781

Barrier, A C; Dwyer, C M; Macrae, A I; Haskell, M J

2012-11-01

417

Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei  

E-print Network

A new laser ion source configuration based on resonant photoionization in a gas cell has been developed at RIBF RIKEN. This system is intended for the future PArasitic RI-beam production by Laser Ion-Source (PALIS) project which will be installed at RIKEN's fragment separator, BigRIPS. A novel implementation of differential pumping, in combination with a sextupole ion beam guide (SPIG), has been developed. A few small scroll pumps create a pressure difference from 1000 hPa - 10^-3 Pa within a geometry drastically miniaturized compared to conventional systems. This system can utilize a large exit hole for fast evacuation times, minimizing the decay loss for short-lived nuclei during extraction from a buffer gas cell, while sufficient gas cell pressure is maintained for stopping high energy RI-beams. In spite of the motion in a dense pressure gradient, the photo-ionized ions inside the gas cell are ejected with an assisting force gas jet and successfully transported to a high-vacuum region via SPIG followed by a quadrupole mass separator. Observed behaviors agree with the results of gas flow and Monte Carlo simulations.

T. Sonoda; M. Wada; H. Tomita; C. Sakamoto; T. Takatsuka; T. Furukawa; H. Iimura; Y. Ito; T. Kubo; Y. Matsuo; H. Mita; S. Naimi; S. Nakamura; T. Noto; P. Schury; T. Shinozuka; T. Wakui; H. Miyatake; S. Jeong; H. Ishiyama; Y. X. Watanabe; Y. Hirayama; K. Okada; A. Takamine

2012-10-24

418

Fundamental mechanisms of optical damage in short-wavelength high-power lasers  

SciTech Connect

Evidence has been accumulating for many years that the physical mechanisms responsible for damage to optical materials in and from high-power, short-wave-length lasers (SWLs) differ in fundamental ways from the thermal processes identified in infrared and visible-wavelength laser damage problems. We propose that this difference stems primarily from the electronic nature of the absorption and excitation processes which occur when SWL photons strike an optical surface, and that electrons, ions and uv photons generated in the laser excitation cycle also contribute to optical damage. In this paper, we present recent experimental results which have pinpointed specific electronic excitation mechanisms which can operate in the high-power laser environment. In many optical materials of interest for SWLs, the deposition of electronic energy creates self-trapped excitons which decay through the energetic expulsion of atoms and molecules from the surface of the material. This erosion process is accompanied by the creation of permanent electronic defects which become nucleation sites for further damage. The relationship between these microscopic mechanisms and observed macroscopic damage phenomenology is discussed, along with evidence for the existence of a surface overlayer which may point the way to radically new techniques for protecting SWL optical elements from laser damage.

Haglund, R.F. Jr.; Tolk, N.H.; York, G.W.

1985-10-01

419

ScalaTrace: Scalable Compression and Replay of Communication Traces for High Performance Computing  

SciTech Connect

Characterizing the communication behavior of large-scale applications is a difficult and costly task due to code/system complexity and long execution times. While many tools to study this behavior have been developed, these approaches either aggregate information in a lossy way through high-level statistics or produce huge trace files that are hard to handle. We contribute an approach that provides orders of magnitude smaller, if not near-constant size, communication traces regardless of the number of nodes while preserving structural information. We introduce intra- and inter-node compression techniques of MPI events that are capable of extracting an application's communication structure. We further present a replay mechanism for the traces generated by our approach and discuss results of our implementation for BlueGene/L. Given this novel capability, we discuss its impact on communication tuning and beyond. To the best of our knowledge, such a concise representation of MPI traces in a scalable manner combined with deterministic MPI call replay are without any precedent.

Noeth, M; Ratn, P; Mueller, F; Schulz, M; de Supinski, B R

2008-05-16

420

Title of Dissertation: A Search for Short Duration Very High Energy Emission from Gamma-Ray Bursts  

E-print Network

ABSTRACT Title of Dissertation: A Search for Short Duration Very High Energy Emission from Gamma-Ray by gamma rays with primary energies of approximately 100 GeV and higher. The wide field of view ( 2 sr) and high duty cycle (>90%) of Milagro make it ideal for searching for transient emission from gamma-ray

California at Santa Cruz, University of

421

SHORT COMMUNICATIONS GeneralBiology  

E-print Network

the nest, and an adult O' perched and then hovered near the 9 , intermittently giving full song. This adult O' had slate-grayupperparts with a yellow- orange bill (see also description in Stiles & Skutch 1989). The 9 flew to a perch 2-3 m from the nest, and the O' followed and hovered near her for 2-4 secwhile

Martin, Paul R.

422

Author's personal copy Short Communication  

E-print Network

2011 Accepted 30 June 2011 Available online 26 July 2011 Keywords: Rape Sexual victimization Women a strategy of sexual coercion. To test these predictions, we studied female college students who had experienced a completed rape, an attempted sexual victimization, or no sexual victimization. Women's mating

Pillow, Jonathan

423

Short Communication Medicine in Danger?  

E-print Network

In his recent and interesting contribution On Heidegger, medicine, and the modernity of modern medical technology Brassington brings together Heideggers philosophy of technology on the one hand and medicine as being increasingly dependent on modern technology on the other (Brassington, 2006). Technology, for Heidegger, as Brassington points out, is associated with danger. Given the central role of technology in medicine, this raises the question to which extent medicine is in fact in danger. Brassington asserts that technologicallyempowered medicine has managed not to import the danger from modern technology and concludes his paper with the following remark: Heideggers worries about modern technology do

Gerben Meynen; Jacco H. P. Verburgt

424

Instructions for use [Short Communications  

E-print Network

,2,3, and 4]. Porous asphalt in Kyoto Jukan Expressway has been maintenance free for fourteen years test for long life of porous asphalt in Kyoto Jukan Expressway (Kyoto). We suppose that most important

Tsunogai, Urumu

425

Author's personal copy Short communication  

E-print Network

. The rupture of an atherosclero- tic plaque is an acute event that can lead to sudden death. For example in embolic stroke and death or permanent neurological deficit. Improved understanding of when and why comprised of a lipid pool covered by a thin fibrous cap tend to rupture and thrombose more frequently

George, Steven C.

426

Author's personal copy Short Communication  

E-print Network

genetic diversity is not affected by population size, which could be explained by recurrent selective sweeps in large populations. These recurrent sweeps are in agreement with the "genetic draft" model). More recently, it has been suggested that the mtDNA pattern presented by the European populations

Carranza, Salvador

427

Short communication Can Kittiwakes smell?  

E-print Network

-legged Kittiwake, Rissa tridactyla, odour, olfaction. Birds have long been thought to have a poor sense of smell-legged Kittiwakes Rissa tridactyla, are diurnal, have relatively small olfactory bulbs (Bang & Cobb 1968) and do

Leclaire, Sarah

428

Effects of Mass Communication on Attitudes toward Anabolic Steroids: An Analysis of High School Seniors  

Microsoft Academic Search

Drawing on a national probability sample of high school seniors (n = 2,560), this research explores relationships between exposure to four types of mass communicationmagazines, movies, newspapers, and televisionand attitudes toward anabolic steroids, operationalized along three dependent measures. Logistic regression analyses revealed statistically significant relationships among (a) magazine exposure and estimates of drug use in professional sports, (b) newspaper and

Bryan E. Denham

2006-01-01

429

Developments in Acoustic Navigation and Communication for High-Latitude Ocean Research  

Microsoft Academic Search

Developments in autonomous platforms (profiling floats, drifters, long-range gliders and propeller-driven vehicles) offer the possibility of unprecedented access to logistically difficult polar regions that challenge conventional techniques. Currently, however, navigation and telemetry for these platforms rely on satellite positioning and communications poorly suited for high-latitude applications where ice cover restricts access to the sea surface. A similar infrastructure offering basin-wide

J. Gobat; C. Lee

2006-01-01

430

Elevation Dependent Shadowing Model for Mobile Communications via High Altitude Platforms in Built-Up Areas  

Microsoft Academic Search

An empirical propagation prediction model is described for mobile communications from high altitude platforms (HAPs) in different types of built-up areas. The model introduced here is defined as a function of the angle of elevation. The target frequencies are selected from the 2 to 6 GHz frequency band prospective for 3G and 4G mobile systems, namely at 2.0,3.5, and 5.5

Jaroslav Holis; Pavel Pechac

2008-01-01

431

Low power high bandwidth power-line communication network for wearable applications  

Microsoft Academic Search

A DC power-line communication (PLC) network for wearable applications is proposed and studied. The DC-PLC network enhances wearability compared to other types of wired networks by requiring minimum amount of wiring. The DC-PLC transceiver is designed based on a low power high bandwidth active inductance circuit, thus not jeopardizing the low power property of the wired solution. The DC-PLC network

Michel Chedid; Ilja Belov; Peter Leisner

2010-01-01

432

First spectral measurements of a cryogenic high-field short-period undulator  

NASA Astrophysics Data System (ADS)

Further development of synchrotron light sources and new concepts for free electron lasers require undulators with short periods and high magnetic fields. A promising approach is the cryogenic permanent magnet undulator concept based on an advanced magnet material. This new rare earth alloy (Pr,Nd)2Fe14B, shows an increasing remanent field of up to 1.7 T without the limits of spin reorientation transition. This work presents first spectral measurements of a prototype cryogenic permanent magnet undulator, consisting of 20 periods of 9 mm in length, cooled by a closed cycle cryo-cooler to temperatures below 30 K. The K parameter of 0.837 at RT is increased by more than 15% to 0.966, and an increase of the third harmonics photon flux of up to 66% was achieved. A possible degradation of the on-axis field quality due to thermally induced magnetic field errors, deduced from the measured bandwidth of the spectrum, is below the limits of the detector resolution of 2%.

Holy, F.; Maier, A. R.; Zeitler, B.; Weingartner, R.; Raith, S.; Kajumba, N.; Ghazaly, M. El; Lauth, W.; Krambrich, D.; Gaupp, A.; Scheer, M.; Bahrdt, J.; Grner, F.

2014-05-01

433

Effect of high density on the short term Calomys musculinus spacing behaviour: A fencing experiment  

NASA Astrophysics Data System (ADS)

We studied the short term spacing behavioural responses of corn mice ( Calomys musculinus) with regard to population density in four 0.25 ha enclosures (two control and two experimental) in the 2007 breeding season. The goal of this research was to test the hypothesis that spacing behaviour only operates among C. musculinus adult females. We estimated 207 home ranges to study: 1) the home range size and the overlap degree of adult males and females in relation to population density; 2) the settlement distances of juveniles to the centre of activity of their mothers and the home range overlap proportion between them and their mothers in relation to population density. We found that home range size and overlap degree in C. musculinus adults were determined by sex and density. At high population density males had significant smaller and more exclusive home ranges, and this might reflect induced territoriality derived from social restrictions. Female home range sizes remained similar irrespective of population density, and they kept exclusive home ranges in both control and experimental enclosures. Thus, females maintained their territories independent of the population density values. The settlement distances of juveniles from their mothers and the overlap proportion between them and their mothers were independent of population density. We conclude that spacing behaviour only operates among C. musculinus adult females and it could have a role in regulating population abundances limiting the number of females that acquire breeding spaces.

Sommaro, Luca V.; Steinmann, Andrea R.; Chiappero, Marina B.; Priotto, Jos W.

2010-05-01

434

Short wavelength limitation in high power AlGaInP laser diodes  

NASA Astrophysics Data System (ADS)

In wavelength region of red color, luminous efficacy rapidly increases as wavelength shortens. In that sense, red laser diode (LD) with shorter wavelength is required for display applications. Experimental results for short wavelength limitation in AlGaInP LDs are shown and discussed in this paper. Broad area LDs with 625, 630, and 638 nm are successfully fabricated. Operation current versus output power (P-I) characteristics and its temperature dependence of 625 nm LD are inferior to that of 630 and 638 nm ones. The main reason might be carrier leakage, and the results indicate that additional countermeasures to carrier leakage should be adopted to realize a 625 nm LD with the same temperature characteristics as 630 and 638 nm LDs. Conversion efficiencies from input electrical power to luminous flux output of the LDs are also studied. 625 nm LD has low efficiency, though brightness of 625 nm light is 1.7 times of 638nm one with the same output power. And 630 nm LD shows better conversion efficiency at high luminous flux region than 638 nm one, though the P-I characteristics of 630 nm is worse than that of 638 nm one. The tendency is inverted at low flux region, indicating that the lasing wavelength of red LD for laser display should be chosen carefully.

Nishida, Takehiro; Shimada, Naoyuki; Ogawa, Tetsuya; Miyashita, Motoharu; Yagi, Tetsuya

2011-03-01

435

GRB980923. A Burst with a Short Duration High-energy Component  

NASA Astrophysics Data System (ADS)

The prompt emission of gamma-ray bursts (GRBs) is usually well described by the Band function: two power laws (PLs) joined smoothly at a given break energy. In addition to the Band component, a few bursts (GRB941017, GRB090510, GRB090902B, and GRB090926A) show clear evidence of a distinct high-energy spectral component, which in some cases evolves independently from the prompt keV component and is well described by a PL, sometimes with a cutoff energy; this component is found to have long duration, even longer than the burst itself for all four bursts. Here we report the observation of an anomalous short duration high-energy component in GRB980923. GRB980923 is one of the brightest GRBs observed by BATSE. Its light curve is characterized by a rapid variability phase lasting ~40 s, followed by a smooth emission tail lasting ~400 s. A detailed joint analysis of BATSE (Large Area Detector and Spectroscopy Detector) and EGRET TASC data of GRB980923 reveals the presence of an anomalous keV to MeV component in the spectrum that evolves independently from the prompt keV one. This component is well described by a PL with a spectral index of -1.44 and lasts only ~2 s it represents one of the three clearly separated spectral components identified in GRB980923, the other two being the keV prompt emission, well described by the Band function and the tail, well fit by a Smoothly Broken Power Law.

Gonzlez, M. M.; Sacahui, J. R.; Ramirez, J. L.; Patricelli, B.; Kaneko, Y.

2012-08-01

436

Integration of the language arts and teacher training: An examination of speech communication instruction in high school English classrooms  

Microsoft Academic Search

National movements toward the integration of the language arts in high school are placing the instruction of communication related skills in the hands of English teachers. Previous research indicates that secondary credential English subject matter programs generally do not require communication related training and so it seems unlikely that English teachers are trained to teach speech and listening according to

Judith A. Barnes; Andrew F. Hayes

1995-01-01

437

Quality of Communication Life in Adolescents with High-Functioning Autism and Asperger Syndrome: A Feasibility Study  

ERIC Educational Resources Information Center

Purpose: This study was designed to evaluate the feasibility of using the American Speech-Language-Hearing Association's Quality of Communication Life Scale (QCL; Paul et al., 2004) for a group of individuals with developmental communication disorders--adolescents with high-functioning autism/Asperger syndrome (HFA/AS). Perceptions of quality of

Burgess, Sloane; Turkstra, Lyn S.

2010-01-01

438

A simulation tool for high data-rate acoustic communication in a shallow-water, time-varying channel  

Microsoft Academic Search

The paper discusses the development of a simulation tool to model high data-rate acoustic communication in shallow water. The simulation tool is able to generate synthetic time series of signals received at a transducer array after transmission across a shallow-water communication channel. The simulation tool is suitable for testing advanced signal processing techniques for message recovery. A channel model has

C. Bjerrum-Niese; L. Bjorno; M. A. Pinto; B. Quellec

1996-01-01

439

Goal-Oriented Communication: A CBO Technique with High Management Payback.  

ERIC Educational Resources Information Center

Discusses communication by objectives, a strategy that extends management by objectives techniques into the area of communication to strengthen ties between decision making and decision communicating. Discusses its classroom application. (FL)

Myrsiades, Linda S.

1984-01-01

440

DE PAUL UNIVERSITY COMMUNICATION DEGREES  

E-print Network

critically about communication events around you, to develop skills valuable in the workplace and to communicate effectively in a diverse world. In short, DePaul can streamline your transition from community communication in interpersonal, group and workplace conte

Schaefer, Marcus

441

Lottery games and risky technologies: communications about low-probability/high-consequence events  

SciTech Connect

There are strong structural similarities between risks from technological hazards and big-purse state lottery games. Risks from technological hazards are often described as low-probability, high-consequence negative events. State lotteries could be equally well characterized as low-probability, high-consequence positive events. Typical communications about state lotteries provide a virtual strategic textbook for opponents of risky technologies. The same techniques can be used to sell lottery tickets or sell opposition to risky technologies. Eight basic principles are enumerated.

Mumpower, J.L.

1988-06-01

442

Highly Efficient Nd:yag Lasers for Free-space Optical Communications  

NASA Technical Reports Server (NTRS)

A highly efficient Nd:YAG laser end-pumped by semiconductor lasers as a possible free-space optical communications source is discussed. Because this concept affords high pumping densities, a long absorption length, and excellent mode-matching characteristics, it is estimated that electrical-to-optical efficiencies greater than 5% could be achieved. Several engineering aspects such as resonator size and configuration, pump collecting optics, and thermal effects are also discussed. Finally, possible methods for combining laser-diode pumps to achieve higher output powers are illustrated.

Sipes, D. L., Jr.

1985-01-01

443

Tissue integrity signals communicated by high-molecular weight hyaluronan and the resolution of inflammation  

PubMed Central

The extracellular matrix polysaccharide hyaluronan (HA) exerts size-dependent effects on leukocyte behavior. Low-molecular weight HA is abundant at sites of active tissue catabolism and promotes inflammation via effects on Toll-like receptor signaling. Conversely, high-molecular weight HA is prevalent in uninjured tissues and is anti-inflammatory. We propose that the ability of high-molecular weight but not low-molecular weight HA to cross-link CD44 functions as a novel form of pattern recognition that recognizes intact tissues and communicates tissue integrity signals that promote resolution of local immune responses. PMID:24614953

Ruppert, S. M.; Hawn, T. R.; Arrigoni, A.; Wight, T. N.

2014-01-01

444

High speed QPPM direct detection optical communication receivers for FSDD intersatellite links  

NASA Technical Reports Server (NTRS)

This final report consists of four separate reports, one for each project involved in this contract. The first report is entitled '325 Mbps QPPM (quaternary pulse position modulation) Direct Detection Free Space Optical Communication Encoder and Receiver,' which was our primary work. The second report is entitled 'Test Results of the 325 Mbps QPPM High Speed Data Transmission GaAs ASICs,' which describes our work in connection with Galaxy Microsystems, Inc. who produced these ASICs for NASA. The third report, 'Receiver Performance Analysis of BPPM Optical Communication Systems Using 1.3 micron Wavelength Transmitter and InGaAs PIN Photodiodes,' was prepared at the request of the NASA/Photonics Branch for their efforts in upgrading the 1773 optical fiber data bus. The fourth report, 'Photomultiplier Tubes for Use at 1.064 micron Wavelength,' was also prepared at the request of the NASA/Photonics Branch as a research project.

Davidson, Frederic M.; Sun, Xiaoli

1993-01-01

445

Miniaturized High-Temperature Superconducting/Dielectric Multilayer Filters for Satellite Communications  

NASA Technical Reports Server (NTRS)

Most communication satellites contain well over a hundred filters in their payload. Current technology in typical satellite multiplexers use dual-mode cavity or dielectric resonator filters that are large (approx. 25 to 125 cu in) and heavy (up to 600 g). As the complexity of future advanced electronic systems for satellite communications increases, even more filters will be needed, requiring filter miniaturization without performance degradation. Such improvements in filter technology will enhance satellite performance. To reduce the size, weight, and cost of the multiplexers without compromising performance, the NASA Lewis Research Center is collaborating with industry to develop a new class of dual-mode multilayer filters consisting of YBa2Cu3O7-delta high-temperature superconducting (HTS) thin films on LaAlO3 substrates.

Miranda, Felix A.

1997-01-01

446

High optical transparent and wireless communication band-pass filtering window  

NASA Astrophysics Data System (ADS)

A high optical transparent and wireless communication band-pass window with hexagon-loop aperture ITO frequency selective surface (FSS) array structure is developed. The parameters of hexagon-loop aperture FSS are designed as h = 5.5mm, w = 0.5mm, d = 2mm according to empirical formula of resonance frequency. The bandpass filtering characteristics of different dielectric-loaded FSS windows with the same dielectric thickness e=0.5mm are simulated and comparatively analyzed. Through calculation results and simulation analysis, it can be found that single-layer dielectric-loaded FSS windows have more stable and desired resonance frequency of 5.8GHz, wider symmetrical bandwidth and independence of incidence angle and polarization than that of double-layer ones at large incidence angles. So it can be concluded that single-layer dielectric-loaded FSS windows are suitable for ISM wireless communication bandpass filtering application.

Liu, Yongmeng; Han, Yu; Yuan, Maoqiang; Ma, Jing

2013-01-01

447

A Psychometric Evaluation of the Career Decision Self-Efficacy Scale-Short Form in Chinese High School Students  

Microsoft Academic Search

This study explores the reliability and validity of the Career Decision Self-Efficacy Scale-Short Form (CDSES-SF) in Chinese high school students. One hundred and eighty-three high school students from a city in northeastern China participated in the study. The results indicate that scores on the CDSES-SF are reliable (internal consistency reliability = .93) with this sample of Chinese high school students.

Nan Zhang Hampton

2006-01-01

448

Starbursts and high-redshift galaxies are radioactive: high abundances of 26Al and other short-lived radionuclides  

NASA Astrophysics Data System (ADS)

Short-lived radionuclides (SLRs) like 26Al are synthesized by massive stars and are a byproduct of star formation. The abundances of SLRs in the gas of a star-forming galaxy are inversely proportional to the gas consumption time. The rapid evolution of specific star formation rate (SSFR) of normal galaxies implies they had mean SLR abundances 3-10 times higher at z = 2. During the epoch of Solar system formation, the background SLR abundances of the Galaxy were up to twice as high as at present, if SLR yields from massive stars do not depend on metallicity. If SLRs are homogenized in the gas of galaxies, the high SSFRs of normal galaxies can partly explain the elevated abundance of SLRs like 60Fe and 26Al in the early Solar system. Starburst galaxies have much higher SSFRs still, and have enormous mean abundances of 26Al (26Al/27Al ?10-3 for solar metallicity gas). The main uncertainty is whether the SLRs are mixed with the star-forming molecular gas: they could be trapped in hot gas and decay before entering the colder phases, or be blown out by starburst winds. I consider how variability in star formation rate affects the SLR abundances, and I discuss how SLR transport may differ in these galaxies. The enhanced 26Al of starbursts might maintain moderate ionization rates (10-18-10-17 s-1), possibly dominating ionization in dense clouds not penetrated by cosmic rays. Similar ionization rates would be maintained in protoplanetary discs of starbursts, if the SLRs are well mixed, and the radiogenic heating of planetesimals would likewise be much higher. In this way, galaxy evolution can affect the geological history of planetary systems.

Lacki, Brian C.

2014-06-01

449

Highly variable chemical signatures over short spatial distances among Scots pine (Pinus sylvestris) populations.  

PubMed

Understanding within-species variability in terpenoid content and composition is highly relevant for predicting species adaptive potential to biotic stresses, but there is still limited information on terpene variations even for widespread species. We studied the foliage content and composition of terpenoids, foliage structure, and carbon (C) and nitrogen (N) contents in Pinus sylvestris L. in four Estonian sites ranging from dry forest to raised bog. In the bogs, samples were taken along the environmental gradient from drier margins towards wetter central parts. A chiral column was used to gain insight into the variation in terpene composition. We hypothesized that terpene contents increase and the composition becomes more diverse in more strongly N-limited sites (greater C/N ratio) and that terpene signatures cluster together in sub-sites with similar conditions (drier/wetter). Altogether 37 terpenes were quantified across the sites. Extremely large variability of terpene contents, 48-62% for monoterpenes and 61-89% for sesquiterpenes, was observed. According to the amounts of ?-pinenes and (+)-3-carene, we distinguished two different 'pine chemotypes'. Contrary to the hypothesis, terpene contents and variability were the greatest in the dry site with the lowest C/N ratio. However, individual terpenoids correlated differently with C or N in different sites, indicating site effects on terpene composition. Moreover, correlations between the terpenoids and C or N depended on the pine chemotype. The sub-sites with different water regime were more strongly clustered together within the site than across the sites. The study demonstrates extensive variations in terpene contents and composition among the populations and over short spatial distances within the populations, suggesting a large among- and within-population adaptive capacity of P. sylvestris. PMID:23513034

Knnaste, Astrid; Copolovici, Lucian; Pazouki, Leila; Suhhorutenko, Marina; Niinemets, lo

2013-04-01

450

verification & Validation of High-Order Short-Characteristics-Based Deterministic Transport Methodology on Unstructured Grids  

SciTech Connect

The research team has developed a practical, high-order, discrete-ordinates, short characteristics neutron transport code for three-dimensional configurations represented on unstructured tetrahedral grids that can be used for realistic reactor physics applications at both the assembly and core levels. This project will perform a comprehensive verification and validation of this new computational tool against both a continuous-energy Monte Carlo simulation (e.g. MCNP) and experimentally measured data, an essential prerequisite for its deployment in reactor core modeling. Verification is divided into three phases. The team will first conduct spatial mesh and expansion order refinement studies to monitor convergence of the numerical solution to reference solutions. This is quantified by convergence rates that are based on integral error norms computed from the cell-by-cell difference between the codes numerical solution and its reference counterpart. The latter is either analytic or very fine- mesh numerical solutions from independent computational tools. For the second phase, the team will create a suite of code-independent benchmark configurations to enable testing the theoretical order of accuracy of any particular discretization of the discrete ordinates approximation of the transport equation. For each tested case (i.e. mesh and spatial approximation order), researchers will execute the code and compare the resulting numerical solution to the exact solution on a per cell basis to determine the distribution of the numerical error. The final activity comprises a comparison to continuous-energy Monte Carlo solutions for zero-power critical configuration measurements at Idaho National Laboratorys Advanced Test Reactor (ATR). Results of this comparison will allow the investigators to distinguish between modeling errors and the above- listed discretization errors introduced by the deterministic method, and to separate the sources of uncertainty.

Azmy, Yousry; Wang, Yaqi

2013-12-20

451

Sex and Age Effects on Willingness To Communicate, Anxiety, Perceived Competence, and L2 Motivation among Junior High School French Immersion Students.  

ERIC Educational Resources Information Center

This cross-sectional investigation focused on second language (L2) communication among students in a junior high French late immersion program. Effects of language, sex, and grade on willingness to communicate, anxiety, and perceived communication competence, on frequency of communication in French, and on attitudes and motivation variables were

MacIntyre, Peter D.; Baker, Susan C.; Clement, Richard; Donovan, Leslie A.

2002-01-01

452

Short- and long-term effects from the communication between carbon-irradiated cancer cells and non-irradiated human cells: implication for radiotherapy and space radiation  

PubMed Central

Heavy ions are one of the most effective treatment for cancer patient and the common types of radiation in space, such as carbon ions [ 1, 2]. However, the mechanism underlying the response between carbon-irradiated cancer cells and neighboring bystander normal cells remains unclear. Using the layered tissue culture strategy [ 3], human glioblastoma (T98G) cells were exposed to high linear energy transfer (LET) carbon ions (LET ?76 keV/m) with a single dose of 6 Gy or dose divided into three fractions given at consecutive day (2 Gy 3 days) at Heavy Ion Medical Accelerator in Chiba. Within 10 min after irradiation, carbon-irradiated T98G cells were trypsinzied and co-cultured with human skin fibroblasts (NB1RGB) in the presence or absence of gap junction inhibitor (18-?-glycyrrhetinic: AGA). During this time, irradiated T98G cells and bystander NB1RGB cells were grown on either side of an insert with 3 m pores. Following 4 h post-irradiation, bystander NB1RGB cells were then harvested and assayed for clonogenic survival and micronucleus (MN) formation or allowed to grow for 10 weeks and assayed for MN formation. Relative to control, both single- and fractionation irradiation showed that the bystander NB1RGB cells that co-cultured with carbon-irradiated T98G cells exhibited reduced cloning efficiency and associated with increased MN formation. In contrast, treatment with AGA showed a significant increase in survival and decrease in MN formation in bystander cells. These indicated that the role of gap junction intercellular communication (GJIC) in the propagation of bystander response from the communication between carbon-irradiated cancer cells and bystander normal cells. Furthermore, the progeny of bystander cells that were co-cultured with carbon-irradiated T98G cells for 10 weeks showed that there was induction of MN formation in both cases. Interestingly, the level of MN formation is reduced if there is the inhibition of GJIC. This supports that a role of GJIC in the propagation of stressful effects in the progeny of bystander cells. Our results provide the clear evidence that the bystander effect and genomic instability depend on intercellular communication and GJIC may be a critical mediator in the observed effects.

Autsavapromporn, Narongchai; Suzuki, Masao; Liu, Cuihua; Murakami, Takeshi

2014-01-01

453

Project description On-chip noise coupling issues for high sensitivity, short range ultra-wide band com-  

E-print Network

propagate effectively to RF ar- eas where it may couple into for instance inductors and transistorsProject description On-chip noise coupling issues for high sensitivity, short range ultra-wide band of the main-stream wireless technologies for the next couple of decades [2]. Considering the amount

Hansen, René Rydhof

454

An Examination of the Structure of the Career Decision Self-Efficacy Scale (Short Form) among Italian High School Students  

ERIC Educational Resources Information Center

This study aims to evaluate the factor structure of Career Decision Self-Efficacy scale-short form in a sample of Italian high school adolescents. confirmatory factor analysis (CFA) was used to test the degree to which a one-factor structure and a five-factor structure provided the best fit. In view of available research the five-factor structure

Presti, Alessandro Lo; Pace, Francesco; Mondo, Marina; Nota, Laura; Casarubia, Provvidenza; Ferrari, Lea; Betz, Nancy E.

2013-01-01

455

Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses  

E-print Network

Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double laser-produced plasmas are bright ultrafast line x-ray sources potentially suitable for different onto a solid target into the x-ray emission is significantly enhanced when a laser prepulse precedes

Limpouch, Jiri

456

Project Number: IST1999-11577 Project Title: Fitness-for-Purpose of Person Person Communication Technologies Short Title: Eye2Eye Deliverable Type: Public  

Microsoft Academic Search

This report describes the rationale, procedures, results and conclusions of the Eye-2-Eye baseline experiments. Optimum quality communication services were tested for the preferences of users and their effects on user behaviour and opinion. The communication services were text chat, audio-telephony, avatar-telephony and video-telephony; hence the communication media studied were text-only, audio-only, audio with moving graphics (virtual reality) and audio with

Trond Schliemann; Trude Asting; Peter Brooks; Asbjrn Flstad; Jan Heim; Jan Hvard; Skjetne Telenor; Bjrn Hestnes; Svein Heiestad; Trond Ulseth; Han Frowein; Paul Devoldere

457

Ultra-High Speed Devices for Wireless Communication Terminals (Current Status and Prospects)  

NASA Astrophysics Data System (ADS)

The technical trend of compound and Si ultra-high speed devices for wireless communication terminals is described. The choice of compound or Si devices depends on the RF frequency range and the required RF handling power. For high frequency applications and for high RF power circuit block, the compound devices still be used and new devices such as InGaP HBT has been developed. If the frequency range is below 6GHz, and the output power is limited, Si devices are becoming common for the transceiver system IC. Based on the device trends, the technical requirements for the ultra-high-speed devices for present and next-generation wireless applications are described. Developments of compound HBT PA and SiGe-RFICs for 3G (W-CDMA) terminals are also described and the circuit techniques used in these RF devices are introduced.

Suematsu, Noriharu

458

Regional determinants of arterial endothelial phenotype dominate the impact of gender or short-term exposure to a high-fat diet  

E-print Network

Regional determinants of arterial endothelial phenotype dominate the impact of gender or short of arrays by region over risk factor. A set of differentially expressed genes was identified which clearly@pobox.upenn.edu (P.F. Davies). www.elsevier.com/locate/ybbrc Biochemical and Biophysical Research Communications 332

Passerini, Tony

459

Dispersed concentration of high-tech jobs in the new economy : the paradox of new information and communication technologies  

E-print Network

More high-tech firms are conducting their business over long distances due to the use of new information and communication technologies (ICT). However, regional scientists articulate that geographic proximity is still ...

Kang, Myoung-Gu, 1970-

2006-01-01

460

Wide-area technologies and services in the Trans-Pacific High Data Rate (HDR) satellite communications experiments  

NASA Technical Reports Server (NTRS)

This paper describes the technologies and services used in the experiments and demonstrations using the Trans-Pacific high data rate satellite communications infrastructure, and how the environment tasked protocol adaptability, scalability, efficiency, interoperability, and robustness.

Hsu, E.; Hung, C.; Kadowaki, N.; Yoshimura, N.; Takahashi, T.; Shopbell, P.; Walker, G.; Wellnitz, D.; Gary, P.; Clark, G.; Yoshikawa, M.; desJardins, R.; Gill, M.; Tatsumi, H.

2000-01-01

461

Advances in high-throughput speed, low-latency communication for embedded instrumentation ( 7th Annual SFAF Meeting, 2012)  

SciTech Connect

Scott Jordan on "Advances in high-throughput speed, low-latency communication for embedded instrumentation" at the 2012 Sequencing, Finishing, Analysis in the Future Meeting held June 5-7, 2012 in Santa Fe, New Mexico.

Jordan, Scott [Physik Instrumente] [Physik Instrumente

2012-06-01

462

Feasible Study of Road-to-Vehicle Communication System using LED Array and High-Speed Camera  

Microsoft Academic Search

In this study, we focus attention on the parallel optical wireless communication systems using LED array transmitter and a high-speed camera as the receiver for road-to-vehicle communications in ITS. Previously, we have proposed a hierarchical coding scheme which allocates data to spatial frequency components depending on the priority. This scheme is possible to receive the high priority data even if

Shintaro ARAI; Shohei MASE; Takaya YAMAZATO; Tomohiro YENDO; Toshiaki FUJII; Masayuki TANIMOTO; Yoshikatsu KIMURA

463

Combinatorial FSK modulation for power-efficient high-rate communications  

NASA Technical Reports Server (NTRS)

Deep-space and satellite communications systems must be capable of conveying high-rate data accurately with low transmitter power, often through dispersive channels. A class of noncoherent Combinatorial Frequency Shift Keying (CFSK) modulation schemes is investigated which address these needs. The bit error rate performance of this class of modulation formats is analyzed and compared to the more traditional modulation types. Candidate modulator, demodulator, and digital signal processing (DSP) hardware structures are examined in detail. System-level issues are also discussed.

Wagner, Paul K.; Budinger, James M.; Vanderaar, Mark J.

1991-01-01

464

A high-efficiency 59- to 64-GHz TWT for intersatellite communications  

NASA Technical Reports Server (NTRS)

The design of a 75-W, 59- to 64- GHz TWT with a predicted overall efficiency in excess of 40 percent is described. This intersatellite communications TWT, designated Model 961HA, employs a coupled-cavity slow-wave structure with a two-step velocity taper and an isotropic graphite multistage depressed collector (MDC). Because the RF efficiency of this TWT is less than 8 percent, an MDC design providing a very high collector efficiency was necessary to achieve the overall efficiency goal of 40 percent.

Wilson, Jeffrey D.; Ramins, Peter; Force, Dale A.; Limburg, Helen C.; Tammaru, Ivo

1991-01-01

465

Reducing the complexity of digital nonlinear compensation for high-speed coherent optical communication systems  

NASA Astrophysics Data System (ADS)

We perform a thorough performance and complexity analysis of a recently proposed Volterra series nonlinear equalizer (VSNE) for digital post-compensation of nonlinear fiber impairments in high-speed and long-haul coherent optical communication systems. Using a maximum absolute value selection criteria, we implement a pruning strategy for the matrix-based VSNE and compare its performance/complexity with the symmetric VSNE (symVSNE) and simpli ed VSNE (simVSNE) algorithms. The theoretical analysis is supported by simulation results obtained for a single-channel 224 Gb/s PM-16QAM transmission system with a signal propagation distance of 1920 km.

Guiomar, Fernando P.; Amado, Sofia B.; Pinto, Armando N.

2014-08-01

466

Means and method for characterizing high power, ultra short laser pulses in a real time, on line manner  

DOEpatents

An ultra short (<10 ps), high power laser pulse is temporally characterized by a system that uses a physical measurement of a wavefront that has been altered in a known manner. The system includes a first reflection switch to remove a portion of a pulse from a beam of pulses, then includes a second reflection switch, operating in a mode that is opposite to the first reflection switch, to slice off a portion of that removed portion. The sliced portion is then directed to a measuring device for physical measurement. The two reflection switches are arranged with respect to each other and with respect to the beam of ultra short pulses such that physical measurement of the sliced portion is related to the temporal measurement of the ultra short pulse by a geometric or trigonometric relationship. The reflection switches are operated by a control pulse that is directed to impinge on each of the reflection switches at a 90.degree. angle of incidence.

Veligdan, James T. (Manorville, NY)

1994-01-01

467

Integration and test of high-speed transmitter electronics for free-space laser communications  

NASA Technical Reports Server (NTRS)

The NASA Lewis Research Center in Cleveland, Ohio, has developed the electronics for a free-space, direct-detection laser communications system demonstration. Under the High-Speed Laser Integrated Terminal Electronics (Hi-LITE) Project, NASA Lewis has built a prototype full-duplex, dual-channel electronics transmitter and receiver operating at 325 megabit S per second (Mbps) per channel and using quaternary pulse-position modulation (QPPM). This paper describes the integration and testing of the transmitter portion for future application in free-space, direct-detection laser communications. A companion paper reviews the receiver portion of the prototype electronics. Minor modifications to the transmitter were made since the initial report on the entire system, and this paper addresses them. The digital electronics are implemented in gallium arsenide integrated circuits mounted on prototype boards. The fabrication and implementation issues related to these high-speed devices are discussed. The transmitter's test results are documented, and its functionality is verified by exercising all modes of operation. Various testing issues pertaining to high-speed circuits are addressed. A description of the transmitter electronics packaging concludes the paper.

Soni, Nitin J.; Lizanich, Paul J.

1994-01-01

468

The Influence of Residual and Trace Elements on Hot Shortness and High Temperature Embrittlement  

Microsoft Academic Search

The problems of hot shortness and overheating have beset the metallurgist, forgemaster and smith for a surprisingly long time. In recent years the increase in electric steelmaking has emphasized the difficulties arising from the steady build up of residual elements which is the inexorable consequence of scrap recirculation. Although many of the early investigations considered the influence of individual trace

D. A. Melford

1980-01-01

469

Study of short haul high-density V/STOL transportation systems. Volume 2: Appendices  

NASA Technical Reports Server (NTRS)

Essential supporting data to the short haul transportation study are presented. The specific appendices are arena characteristics, aerospace transportation analysis computer program, economics, model calibration, STOLport siting and services path selection, STOL schedule definition, tabulated California corridor results, and tabulated Midwest arena results.

Solomon, H. L.

1972-01-01

470

Short wavelength limitation in high power AlGaInP laser diodes  

Microsoft Academic Search

In wavelength region of red color, luminous efficacy rapidly increases as wavelength shortens. In that sense, red laser diode (LD) with shorter wavelength is required for display applications. Experimental results for short wavelength limitation in AlGaInP LDs are shown and discussed in this paper. Broad area LDs with 625, 630, and 638 nm are successfully fabricated. Operation current versus output

Takehiro Nishida; Naoyuki Shimada; Tetsuya Ogawa; Motoharu Miyashita; Tetsuya Yagi

2011-01-01

471

Short-Term Memory Tests in Personnel Selection: Low Adverse Impact and High Validity.  

ERIC Educational Resources Information Center

Two meta-analyses, one with 27,973 subjects in 31 studies and one with 34,262 subjects in 141 studies, found that tests of short-term memory are valid predictors of job and training performance and that racial differences are smaller than is usual on cognitive tests. (SLD)

Verive, Jennifer M.; McDaniel, Michael A.

1996-01-01

472

Reconfigurable Antennas for High Data Rate Multi-beam Communication Systems  

NASA Technical Reports Server (NTRS)

High-speed (2-100 Mb/sec) wireless data communication - whether land- or satellite-based - faces a major challenge: high error rates caused by interference and unpredictable environments. A planar antenna system that can be reconfigured to respond to changing conditions has the potential to dramatically improve data throughput and system reliability. Moreover, new planar antenna designs that reduce array size, weight, and cost can have a significant impact on terrestrial and satellite communication system performance. This research developed new individually-reconfigurable planar antenna array elements that can be adjusted to provide multiple beams while providing increased scan angles and higher aperture efficiency than traditional diffraction-limited arrays. These new elements are microstrip spiral antennas with specialized tuning mechanisms that provide adjustable radiation patterns. We anticipate that these new elements can be used in both large and small arrays for inter-satellite communication as well as tracking of multiple mobile surface-based units. Our work has developed both theoretical descriptions as well as experimental prototypes of the antennas in both single element and array embodiments. The technical summary of the results of this work is divided into six sections: A. Cavity model for analysis and design of pattern reconfigurable antennas; B. Performance of antenna in array configurations for broadside and endfire operation; C. Performance of antenna in array configurations for beam scanning operation; D. Simulation of antennas in infinite phased arrays; E. Demonstration of antenna with commercially-available RF MEMS switches; F. Design of antenna MEMS switch combinations for direct simultaneous fabrication.

Bernhard, Jennifer T.; Michielssen, Eric

2005-01-01

473

Emittance-exchange-based high harmonic generation scheme for short-wavelength free electron laser.  

SciTech Connect

Generation of short-wavelength radiation by a free-electron laser using up-frequency conversion of an electron bunch density modulation is currently an area of active research. We propose a new scheme for producing the longitudinal electron bunch density modulation similar to the recently proposed echo-enabled harmonic generation but based on an emittance exchange beam line and a multislit mask. Beam line analysis and start-to-end simulation are presented.

Power, J. G.; Jiang, B.; Gai, W.; Liu, W.; Lindberg, R. (Advanced Photon Source); ( HEP); (Shanghai Inst. of Applied Physics)

2011-03-16

474

Emittance-Exchange-Based High Harmonic Generation Scheme for a Short-Wavelength Free Electron Laser  

SciTech Connect

Generation of short-wavelength radiation by a free-electron laser using up-frequency conversion of an electron bunch density modulation is currently an area of active research. We propose a new scheme for producing the longitudinal electron bunch density modulation similar to the recently proposed echo-enabled harmonic generation but based on an emittance exchange beam line and a multislit mask. Beam line analysis and start-to-end simulation are presented.

Jiang, B. [Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)] [Shanghai Institute of Applied Physics, CAS, Shanghai 201800 (China); Power, J. G.; Lindberg, R.; Liu, W.; Gai, W. [Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)

2011-03-18

475

Short-range magnetic correlations in the highly correlated electron compound CeCu4Ga  

NASA Astrophysics Data System (ADS)

We present experimental results for the heavy-electron compound CeCu4Ga which show that it possesses short-range magnetic correlations down to a temperature of T =0.1 K. Our neutron scattering data show no evidence of long-range magnetic order occurring despite a peak in the specific heat at T*=1.2 K. Rather, magnetic diffuse scattering occurs which corresponds to short-range magnetic correlations occurring across two unit cells. The specific heat remains large as T 0 K, resulting in a Sommerfeld coefficient of ?0=1.44(2) J/mol K2, and, below T*, the resistivity follows T2 behavior and the ac magnetic susceptibility becomes temperature independent. A magnetic peak centered at an energy transfer of Ec=0.24(1) meV is seen in inelastic neutron scattering data which shifts to higher energies and broadens under a magnetic field. We discuss the coexistence of large specific heat, magnetic fluctuations, and short-range magnetic correlations at low temperatures and compare our results to those for materials possessing spin-liquid behavior.

Ueland, B. G.; Miclea, C. F.; Gofryk, K.; Qiu, Y.; Ronning, F.; Movshovich, R.; Bauer, E. D.; Gardner, J. S.; Thompson, J. D.

2014-09-01

476

Against Expectation: A Short Sequence With High Signal Elucidates Cone Snail Phylogeny  

PubMed Central

A short (259 nucleotide) conserved intronic sequence (CIS) is surprisingly informative for delineating deep phylogenetic relationships in cone snails. Conus species previously have been assigned to clades based on the evidence from mitochondrial 12S and 16S rRNA gene sequences (1129 bp). Despite their length, these genes lack the phylogenetic information necessary to resolve the relationships among the clades. Here we show that the relationships can be inferred from just 46 sites in the very short CIS sequence (a portion of intron 9 of the ?-glutamyl carboxylase gene). This is counterintuitive because in short sequences sampling error (noise) often drowns out phylogenetic signal. The intron 9 CIS is rich in synapomorphies that define the divergence patterns among eight clades of worm- and fish-hunting Conus, and it contains almost no homoplasy. Parsimony, maximum-likelihood and Bayesian analyses of the combined sequences (mt rRNA + CIS) confirm most of the relationships among 23 Conus sequences. This phylogeny implies that fish-hunting behavior evolved at least twice during the history of Conus -once among New World species and independently in the Indo-Pacific clades. PMID:21147238

Kraus, Nicole J.; Corneli, Patrice Showers; Watkins, Maren; Bandyopadhyay, Pradip K.; Seger, Jon; Olivera, Baldomero M.

2011-01-01

477

Participation of gap junction communication in potentially lethal damage repair and DNA damage in human fibroblasts exposed to low- or high-LET radiation.  

PubMed

Existing research has not fully explained how different types of ionizing radiation (IR) modulate the responses of cell populations or tissues. In our previous work, we showed that gap junction intercellular communication (GJIC) mediates the propagation of stressful effects among irradiated cells exposed to high linear energy transfer (LET) radiations, in which almost every cells is traversed by an IR track. In the present study, we conducted an in-depth study of the role of GJIC in modulating the repair of potentially lethal damage (PLDR) and micronuclei formation in cells exposed to low- or high-LET IR. Confluent human fibroblasts were exposed in the presence or absence of a gap junction inhibitor to 200kV X rays (LET?1.7keV/?m), carbon ions (LET?76keV/?m), silicon ions (LET?113keV/?m) or iron ions (LET?400keV/?m) that resulted in isosurvival levels. The fibroblasts were incubated for various times at 37C. As expected, high-LET IR were more effective than were low-LET X rays at killing cells and damaging DNA shortly after irradiation. However, when cells were held in a confluent state for several hours, PLDR associated with a reduction in DNA damage, occurred only in cells exposed to X rays. Interestingly, inhibition of GJIC eliminated the enhancement of toxic effects, which resulted in an increase of cell survival and reduction in the level of micronucleus formation in cells exposed to high, but not in those exposed to low-LET IR. The experiment shows that gap-junction communication plays an important role in the propagation of stressful effects among irradiated cells exposed to high-LET IR while GJIC has only a minimal effect on PLDR and DNA damage following low-LET irradiation. Together, our results show that PLDR and induction of DNA damage clearly depend on gap-junction communication and radiation quality. PMID:23867854

Autsavapromporn, Narongchai; Suzuki, Masao; Plante, Ianik; Liu, Cuihua; Uchihori, Yukio; Hei, Tom K; Azzam, Edouard I; Murakami, Takeshi

2013-08-30

478

Participation of gap junction communication in potentially lethal damage repair and DNA damage in human fibroblasts exposed to low- or high-LET radiation  

PubMed Central

Existing research has not fully explained how different types of ionizing radiation (IR) modulate the responses of cell populations or tissues. In our previous work, we showed that gap junction intercellular communication (GJIC) mediates the propagation of stressful effects among irradiated cells exposed to high linear energy transfer (LET) radiations, in which almost every cells is traversed by an IR track. In the present study, we conducted an in-depth study of the role of GJIC in modulating the repair of potentially lethal damage (PLDR) and micronuclei formation in cells exposed to low- or high-LET IR. Confluent human fibroblasts were exposed in the presence or absence of a gap junction inhibitor to 200 kV X rays (LET ? 1.7 keV/m), carbon ions (LET ? 76 keV/m), silicon ions (LET ? 113 keV/m) or iron ions (LET ? 400 keV/m) that resulted in isosurvival levels. The fibroblasts were incubated for various times at 37 C. As expected, high-LET IR were more effective than were low-LET X rays at killing cells and damaging DNA shortly after irradiation. However, when cells were held in a confluent state for several hours, PLDR associated with a reduction in DNA damage, occurred only in cells exposed to X rays. Interestingly, inhibition of GJIC eliminated the enhancement of toxic effects, which resulted in an increase of cell survival and reduction in the level of micronucleus formation in cells exposed to high, but not in those exposed to low-LET IR. The experiment shows that gap-junction communication plays an important role in the propagation of stressful effects among irradiated cells exposed to high-LET IR while GJIC has only a minimal effect on PLDR and DNA damage following low-LET irradiation. Together, our results show that PLDR and induction of DNA damage clearly depend on gap-junction communication and radiation quality. PMID:23867854

Autsavapromporn, Narongchai; Suzuki, Masao; Plante, Ianik; Liu, Cuihua; Uchihori, Yukio; Hei, Tom K.; Azzam, Edouard I.; Murakami, Takeshi

2014-01-01

479

Grand Challenges: High Performance Computing and Communications. The FY 1992 U.S. Research and Development Program.  

ERIC Educational Resources Information Center

This report presents a review of the High Performance Computing and Communications (HPCC) Program, which has as its goal the acceleration of the commercial availability and utilization of the next generation of high performance computers and networks in order to: (1) extend U.S. technological leadership in high performance computing and computer

Federal Coordinating Council for Science, Engineering and Technology, Washington, DC.

480

P.U.R.E. Communication: A Strategy to Improve Care-Coordination for High Risk Birth  

PubMed Central

High-risk birth can be an emotionally-charged and sometimes emergent event that requires a cohesive multidisciplinary team. Communication breakdowns in perinatal emergencies are known to contribute to errors and adverse patient outcomes. One approach to breaching these barriers is the Purposeful, Unambiguous, Respectful, and Effective, P.U.R.E. process. P.U.R.E. is a method of communication that emphasizes coordination and recognizes the contributions of each member of the team. The purpose of this article is to describe how the P.U.R.E. process works and how teamwork strategies, group skills training, and structured communication techniques complement it. PMID:22773922

Gephart, Sheila M.; Cholette, Meghan

2012-01-01

481

High performance computing and communications: Advancing the frontiers of information technology  

SciTech Connect

This report, which supplements the President`s Fiscal Year 1997 Budget, describes the interagency High Performance Computing and Communications (HPCC) Program. The HPCC Program will celebrate its fifth anniversary in October 1996 with an impressive array of accomplishments to its credit. Over its five-year history, the HPCC Program has focused on developing high performance computing and communications technologies that can be applied to computation-intensive applications. Major highlights for FY 1996: (1) High performance computing systems enable practical solutions to complex problems with accuracies not possible five years ago; (2) HPCC-funded research in very large scale networking techniques has been instrumental in the evolution of the Internet, which continues exponential growth in size, speed, and availability of information; (3) The combination of hardware capability measured in gigaflop/s, networking technology measured in gigabit/s, and new computational science techniques for modeling phenomena has demonstrated that very large scale accurate scientific calculations can be executed across heterogeneous parallel processing systems located thousands of miles apart; (4) Federal investments in HPCC software R and D support researchers who pioneered the development of parallel languages and compilers, high performance mathematical, engineering, and scientific libraries, and software tools--technologies that allow scientists to use powerful parallel systems to focus on Federal agency mission applications; and (5) HPCC support for virtual environments has enabled the development of immersive technologies, where researchers can explore and manipulate multi-dimensional scientific and engineering problems. Educational programs fostered by the HPCC Program have brought into classrooms new science and engineering curricula designed to teach computational science. This document contains a small sample of the significant HPCC Program accomplishments in FY 1996.

NONE

1997-12-31

482

Safety Assurance and Rescue Communication Systems in High-Stress Environments -A Mining  

E-print Network

; and deep-space communication in outer-space exploration. We have observed a correlation between the channel collapses, nuclear facility malfunctions; and deep space communication in outer-space exploration. We shall

New South Wales, University of

483

A study of secondary electron emission effects for suppressing passive intermodulation interference in high power communication satellites  

NASA Technical Reports Server (NTRS)

In this paper a study of secondary electron emission effects for suppressing passive intermodulation interference in high power communications satellites is studied. The test facility is described and the test results are provided. The effects of environmental factors on the secondary emission coefficient are given. It is found that certain refractory compounds are very promising in eliminating some of the passive intermodulation in satellite communications.

Bosisio, Renato G.; Xu, Yansheng

1995-01-01

484

High-Resolution DNA Melt Curve Analysis of the Clustered, Regularly Interspaced Short-Palindromic-Repeat Locus of Campylobacter jejuni  

Microsoft Academic Search

A novel method for genotyping the clustered, regularly interspaced short-palindromic-repeat (CRISPR) locus of Campylobacter jejuni is described. Following real-time PCR, CRISPR products were subjected to high-resolution melt (HRM) analysis, a new technology that allows precise melt profile determination of amplicons. This investigation shows that the CRISPR HRM assay provides a powerful addition to existing C. jejuni genotyping methods and emphasizes

Erin P. Price; Helen Smith; Flavia Huygens; Philip M. Giffard

2007-01-01

485

Transient analysis of short, high-concentration, gain-clamped Er3+Yb3+ codoped fiber amplifiers  

Microsoft Academic Search

A theoretical study of the dynamics of short high-concentration gain-clamped Er3+-Yb3+ codoped fiber amplifiers is presented. The effect of various parameters on the transient power excursions and relaxation oscillation frequency of a given signal input channel when other signal channels are added or dropped from an initial steady-state configuration is analyzed. In particular, the effects of Er3+ clustering, Yb3+ concentration,

Eldad Yahel; Ortwin Hess; Amos A. Hardy

2006-01-01

486

New scheme for high-efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation  

Microsoft Academic Search

This paper presents the new scheme for high-efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation. When the terminal voltage Vi of the hysteresis motor running at synchronous speed is continuously increased up to nVi (n > 1) and then continuously decreased to Vi, input currents are reduced and output power is increased at the same time. Because of

Tomotsugu Kubota; Takahiro Tamura; Kazumi Kurihara

2010-01-01

487

Vegetation response to a short interval between high-severity wildfires in a mixed-evergreen forest  

Microsoft Academic Search

Summary 1. Variations in disturbance regime strongly influence ecosystem structure and function. A prominent form of such variation is when multiple high-severity wildfires occur in rapid succession (i.e. short-interval (SI) severe fires, or 're-burns'). These events have been proposed as key mechanisms altering successional rates and pathways. 2. We utilized a natural experiment afforded by two overlapping wildfires occurring within

Daniel C. Donato; Joseph B. Fontaine; W. Douglas Robinson; J. Boone Kauffman; Beverly E. Law

2009-01-01

488

Relationship of Offshore Sediment Distribution to Short-Term Shoreline Change Using High Resolution Shoreface Mapping Techniques  

Microsoft Academic Search

Real time kinematic GPS (RTK-GPS), bathymetric, and side-scan sonar data were integrated to analyze short-term shoreline change, from December 2001 to August 2002, in relation to offshore sediment distribution. Local beach behavior, induced by erosional and depositional events, can be identified by longshore trends in shoreline position variability. Those trends can be identified with high-resolution spatial data. Accurate shoreface morphology

D. J. Bernstein; M. F. Forte; P. T. Gayes; W. Baldwin

2002-01-01

489

High-sensitivity DPSK receiver for high-bandwidth free-space optical communication links.  

PubMed

A high-sensitivity modem and high-dynamic range optical automatic gain controller (OAGC) have been developed to provide maximum link margin and to overcome the dynamic nature of free-space optical links. A sensitivity of -48.9 dBm (10 photons per bit) at 10 Gbps was achieved employing a return-to-zero differential phase shift keying based modem and a commercial Reed-Solomon forward error correction system. Low-noise optical gain was provided by an OAGC with a noise figure of 4.1 dB (including system required input loses) and a dynamic range of greater than 60 dB. PMID:21643335

Juarez, Juan C; Young, David W; Sluz, Joseph E; Stotts, Larry B

2011-05-23

490

Laser Communications and Fiber Optics Lab Manual. High-Technology Training Module.  

ERIC Educational Resources Information Center

This laboratory training manual on laser communications and fiber optics may be used in a general technology-communications course for ninth graders. Upon completion of this exercise, students achieve the following goals: match concepts with laser communication system parts; explain advantages of fiber optic cable over conventional copper wire;

Biddick, Robert

491

Proton radiation damage effects on the response of high speed communication avalanche photodiodes  

NASA Astrophysics Data System (ADS)

This paper discusses the radiation dependent characteristics of avalanche photodiodes (APDs). The reliability, of semiconductor detectors, is very dependent on the degradation modes. In this study, we present the main irradiation effects such as the multiplication gain, minority carrier life time, illumination, and radiation damage coefficient. Protons radiation effects, on the model of two different silicon avalanche photodiode structures, has been investigated. The results demonstrate that the model can accurately calculate the internal parameters of the APDs and produce data that can be directly compared with measurements. The fluence effects of 51 MeV proton irradiation, on the photosensitivity and signal to noise ratio, are also investigated. The objective was to analyze the effect depletion region volume and carrier concentration, of the i-region of APDs, on radiation hardness. Moreover, we have investigated, deeply, some of the degradation performance and capabilities of typical APDs, currently used in many communication and sensing systems, over wide range of the affecting parameters. APDs are used in systems that require coherent, and often single mode, light such as high data rate communications and sensing applications. APDs are an attractive receiver choice for low signal applications because their internal gain mechanism can improve signal to noise ratio. Additionally, we have taken into account the harmful effects of proton radiation on the device performance such as signal to noise ratio, bit error rate, gain, sensitivity, device responsitivity and operating efficiency.

Rashed, Ahmed Nabih Zaki; El-Halawany, Mohamed M. E.

2013-01-01

492

A Simple Semaphore Signaling Technique for Ultra-High Frequency Spacecraft Communications  

NASA Technical Reports Server (NTRS)

For planetary lander missions such as the upcoming Phoenix mission to Mars, the most challenging phase of the spacecraft-to-ground communications is during the critical phase termed entry, descent, and landing (EDL). At 8.4 GHz (X-band), the signals received by the largest Deep Space Network (DSN) antennas can be too weak for even 1 bit per second (bps) and therefore not able to communicate critical information to Earth. Fortunately, the lander s ultra-high frequency (UHF) link to an orbiting relay can meet the EDL requirements, but the data rate needs to be low enough to fit the capability of the UHF link during some or all of EDL. On Phoenix, the minimum data rate of the as-built UHF radio is 8 kbps and requires a signal level at the Odyssey orbiter of at least -120 dBm. For lower signaling levels, the effective data rate needs to be reduced, but without incurring t