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1

SHORT COMMUNICATION Ultra-high-throughput microbial community analysis  

E-print Network

.2012.8 Subject Category: microbial ecology and functional diversity of natural habitats Keywords high- throughput microbial ecology at the greatest cover- age yet possible. Although some technicalSHORT COMMUNICATION Ultra-high-throughput microbial community analysis on the Illumina HiSeq and Mi

Fierer, Noah

2

Short Communication High hydrogen production rate of microbial electrolysis cell (MEC) with  

E-print Network

Short Communication High hydrogen production rate of microbial electrolysis cell (MEC) with reduced production rate Microbial electrolysis cell a b s t r a c t Practical applications of microbial electrolysis- ward et al., 2000). A new technology called a microbial electrolysis cell (MEC) can achieve sustainable

3

[Submitted manuscript] Short communication  

E-print Network

[Submitted manuscript] Short communication Pharmacokinetics and safety of cetuximab in a patient. Corresponding author: H. Gelderblom, a.j.gelderblom@lumc.nl Keywords: cetuximab, renal dysfunction was treated on compassionate use basis with 400 mg/m2 cetuximab. Pharmacokinetic parameters after the first

Paris-Sud XI, Université de

4

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

5

High performance directly modulated 10Gb\\/s DFB laser transmitters for low-cost, short distance optical communication network  

Microsoft Academic Search

The increasing demand on the capacity of the communication system is pushing the industry into more advanced development stage, especially true for SONET\\/SDH TDM 10Gb\\/s systems. In addition to the long haul network, there is a big interest in short distance, low cost system suitable for local ring architecture around Metropolitan area. In this talk, we investigate directly modulated 10Gb\\/s

Osamu Mizuhara; T. V. Nguyen; Roeland J. Nuyts; Liang D. Tzeng

1997-01-01

6

High performance directly modulated 10Gb/s DFB laser transmitters for low-cost, short distance optical communication network  

NASA Astrophysics Data System (ADS)

The increasing demand on the capacity of the communication system is pushing the industry into more advanced development stage, especially true for SONET/SDH TDM 10Gb/s systems. In addition to the long haul network, there is a big interest in short distance, low cost system suitable for local ring architecture around Metropolitan area. In this talk, we investigate directly modulated 10Gb/s DFB laser based transmitters. Both 1.3 micrometer and 1.55 micrometer DFB lasers are evaluated, including uncooled lasers. Since most of the installed fiber in the U.S. is conventional, non-dispersion shifted fiber, we also focus on chirp induced dispersion penalty using the 1.55 micrometer laser. Their performance is compared with some externally modulated transmitters, and experiments are conducted for transmitting over non-dispersion shifted fiber.

Mizuhara, Osamu; Nguyen, T. V.; Nuyts, Roeland J.; Tzeng, Liang D.

1997-04-01

7

Intentionally Short-Range Communications (ISRC)  

NASA Astrophysics Data System (ADS)

The U.S. Marine Corps (USMC) desired to develop short-range communications links whose ranges are intentionally limited to very short distances. These links support tactical missions such as LAN Backbone, Wideband Data Link, and Company Radio. The short-range limitation arises from the need for low probability of detection and intercept (LPD/LPI). Since the detection of an undecipherable transmission would still provide an enemy with information regarding transmitter location and allow him to take countermeasures, the Marine Corps Systems Command (MARCORSYSCOM) is sponsoring the development of technologies that can be LPD by their very nature. The Intentionally Short-Range Communications (ISRC) project at the Naval Command, Control and Ocean Surveillance Center (NCCOSC) RDT&E Division (NRaD) is pursuing feasibility studies for these USMC missions based on such technologies as ultraviolet (LTV) lamps, UV lasers, infrared (IR) lasers, millimeter waves and direct sequence spread spectrum (DSSS) at radio frequencies.

Yen, J.; Poirier, P.; Obrien, M.

1994-02-01

8

Short Communication Microscopic analysis of structure stabilities  

E-print Network

. This new combination of two classical methods allows a progressive discovery of the microscopic relevant2005 Short Communication Microscopic analysis of structure stabilities in the ionic compounds B primary order distortion, and thus find the microscopic interactions responsible for the symmetry breaking

Boyer, Edmond

9

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, Inc. Papillomaviruses are small DNA viruses which infect proteins including the retinoblastoma tumor

Brent, Roger

10

SHORT COMMUNICATION Modelling the concentration of exuded  

E-print Network

SHORT COMMUNICATION Modelling the concentration of exuded dimethylsulphoniopropionate (DMSP source for planktonic bacteria has long been recognized (e.g. Cole, 1982). Recently, Fredrickson for marine bacteria (Kiene et al., 2000), DMSP has also been shown to act as a chemoattractant for bacteria

Codling, Edward A.

11

Short communication Immunophysiology of the mammary gland  

E-print Network

Short communication Immunophysiology of the mammary gland and transmission of immunity to the young of immunity by the mammary gland from the mother to her offspring is related to the rate of transmission are present in the mammary gland at delivery and during lactation [4, 5]. In the mouse, it has been shown

Paris-Sud XI, Université de

12

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. Philip Smith University Marine Biological Station Millport, Isle of Cumbrae, KA28 0EG, Scotland, United). However, little is known about the biology of M. rugosa, including fundamental life history parameters

Claverie, Thomas

13

SHORT COMMUNICATION Presence of Aspergillus sydowii, a  

E-print Network

SHORT COMMUNICATION Presence of Aspergillus sydowii, a pathogen of gorgonian sea fans in the marine Pawlik5 and Oded Yarden3 1 Department of Zoology, George S Wise Faculty of Life Sciences, Tel Aviv; 4 Department of Biology, University of South Carolina-Aiken, Aiken, SC, USA and 5 Center for Marine

Pawlik, Joseph

14

Short communication Gallium and oxygen accumulations on gallium nitride surfaces  

E-print Network

Short communication Gallium and oxygen accumulations on gallium nitride surfaces following argon Available online 17 April 2004 Abstract Metallic gallium was observed on the surfaces of GaN commercial rights reserved. Keywords: Gallium nitride; Argon ion milling; Ultra-high vacuum 1. Introduction Gallium

Timmers, Heiko

15

Dedicated short-range communications (DSRC) for AHS services  

Microsoft Academic Search

The Japanese advanced cruise-assist highway system (AHS) provides driving support services through collaboration between the system and vehicle. AHS uses dedicated short-range communications (DSRC) for road-to-vehicle dialog that requires real-time and high-reliability operation. AHS-DSRC constitutes a small radio zone that provides driving support information in a cycle of 0.1 seconds. DSRC incorporates a marker beacon and an information beacon that

Hiroshi Inoue; Susumu Osawa; Atsushi Yashiki; Hiroshi Makino

2004-01-01

16

Short communication: Effects of molasses supplementation on performance of lactating cows fed high-alfalfa silage diets.  

PubMed

Twelve Holstein cows were used in a replicated Latin square experiment to determine the effect of adding dried molasses to high-alfalfa silage diets on dairy cow performance. Three isonitrogenous diets were formulated with a 68:32 forage:concentrate ratio, with alfalfa silage as the only forage source. Dietary treatments were a control diet with no added molasses and 3 and 6% dried molasses diets. Three lactating Holstein cows fitted with ruminal cannulas were used to determine the effects of dietary treatments on ruminal fermentation. Dietary treatments had no effect on dry matter (average 23.3 kg/d), crude protein (average 4.4 kg/d), or neutral detergent fiber (average 7.4 kg/d) intake. Milk yield, energy-corrected milk (average 35.4 kg/d), and 4% fat-corrected milk (average 33.8 kg/d) were not influenced by dietary treatments. Cows fed the control diet produced milk with less milk urea nitrogen concentration than those fed molasses-supplemented diets. Ruminal pH, NH3-N concentration, and total volatile fatty acids were not different among dietary treatments. The molar proportion of acetate linearly increased, whereas the molar proportion of propionate linearly decreased as the level of dried molasses increased. It was concluded that addition of dried molasses to high-alfalfa silage diets at 6% of the diet (dry matter basis) increased milk urea nitrogen but had no effect on animal performance. PMID:24315324

Baurhoo, B; Mustafa, A

2014-02-01

17

Biosensors and Bioelectronics 22 (2007) 32523255 Short communication  

E-print Network

Biosensors and Bioelectronics 22 (2007) 3252­3255 Short communication Increased power production). Electricigenic bacteria in the sediment transfer electrons pro- duced during the oxidation of organic

18

Short Communication: Apoptosis Pathways in HIV-1-Infected Patients Before and After Highly Active Antiretroviral Therapy: Relevance to Immune Recovery.  

PubMed

Investigations into apoptotic pathways, intrinsic and extrinsic, and the effects of highly active antiretroviral therapy (HAART) on T cell death via those pathways may provide insight into the mechanisms of and barriers to immune recovery. HIV-1-infected patients were enrolled into a randomized, controlled study of the immune effects of a lopinavir/ritonavir (LPV/r)-based versus an efavirenz (EFV)-based HAART regimen in antiretroviral-naive subjects with CD4(+) counts <350 cells/mm(3). Patients were randomized to receive TDF/FTC/EFZ or TDF/FTC plus LPV/r. Fourteen patients were enrolled and 10 patients completed 6 months of therapy as per the protocol. CD4(+) counts were measured before and during HAART therapy. We isolated T cell subsets to measure ex vivo apoptosis by propidium iodide staining. We also assessed caspase activation for the intrinsic and extrinsic pathways of apoptosis, as well as effector caspase activation. We also measured mitochondrial membrane potential. Cells were analyzed by flow cytometry. All patients had increased activation of caspase 8 (extrinsic pathway), caspase 9 (intrinsic pathway), effector caspases 3/7, and low mitochondrial membrane potential at baseline compared to controls. By 4 weeks, there was a decrease in activation of all caspases, but little further decrease by week 24. T cell mitochondrial membrane potential did not increase until week 12, but continued to increase until week 24. The only predictor of CD4(+) count increase was the increase in mitochondrial membrane potential of naive cells at 6 months (r=0.66, p=0.038). This suggests that positive selection of naive CD4(+) T cells in the thymus is the major determinant of CD4(+) recovery. PMID:25386736

Pitrak, David L; Novak, Richard M; Estes, Randee; Tschampa, Jean; Abaya, Christina D; Martinson, Jeffrey; Bradley, Kirsten; Tenorio, Allan R; Landay, Alan L

2015-02-01

19

Transactions via short range communication links-analytical evaluation of communication parameters  

Microsoft Academic Search

Dedicated short-range communication (DSRC) networks are mobile radio networks which use short communication zones to send packets between beacons and vehicles controlled by the beacons. Parameters of great interest are the size of the communication area and the packet length for different applications. In this paper an analytical way to calculate this parameter for beacons supporting dialogue services, like automatic

J. Kaltwasser; M. Pietschmann

1994-01-01

20

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

21

SHORT COMMUNICATION Dynamical analysis of winter terrain park jumps  

E-print Network

SHORT COMMUNICATION Dynamical analysis of winter terrain park jumps James A. McNeil ? James B. Mc, friction, air drag/lift, or cen- tripetal forces from course curvature. Catalfamo [7] used a dynamics

22

SHORT COMMUNICATION No evidence of Wolbachia among Great  

E-print Network

SHORT COMMUNICATION No evidence of Wolbachia among Great Lakes area populations of Daphnia pulex of its own life-history traits. INTRODUCTION Intracellular bacteria of the genus Wolbachia are believed

Innes, David J.

23

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.

24

Short Communication Concurrent ranavirus and Batrachochytrium dendrobatidis infection in captive  

E-print Network

Short Communication Concurrent ranavirus and Batrachochytrium dendrobatidis infection in captive Dendrobates Batrachochytrium dendrobatidis a b s t r a c t A ranavirus infection with concurrent Batrachochytrium dendrobatidis infection and mortality in captive Phyllobates and Dendrobates species is reported

Gray, Matthew

25

http://connectivitylab.eecs.berkeley.edu 60 GHz Short-Range Wireless Communication  

E-print Network

http://connectivitylab.eecs.berkeley.edu 60 GHz Short-Range Wireless Communication Several GHz to accommodate up to 10Gbps high- throughput wireless communications. It can satisfy the requirement of bandwidth attenuation and directional nature of the 60 GHz wireless channel as well as limited gain amplifiers

Zakhor, Avideh

26

Short-Range Optical Wireless Communications  

Microsoft Academic Search

It is commonly agreed that the next generation of wireless communication systems, usually referred to as 4G systems, will not be based on a single access technique but it will encompass a number of different complementary access technologies. The ultimate goal is to provide ubiquitous connectivity, integrating seamlessly operations in most common scenarios, ranging from fixed and low-mobility indoor environments

Dominic C O'Brien

27

Journal of Power Sources 132 (2004) 256260 Short communication  

E-print Network

and as a composite anode in a lithium battery system. Impedance spectroscopy and galvanostatic testing, XJournal of Power Sources 132 (2004) 256­260 Short communication Nanoscale battery materials based. Work in field of lithium polymer batteries has reached many milestones and performance increases [1

Rubloff, Gary W.

28

Short Communication Identification of a nucleopolyhedrovirus in winter moth populations  

E-print Network

Short Communication Identification of a nucleopolyhedrovirus in winter moth populations from: Nucleopolyhedrovirus Winter moth Operophtera brumata Polyhedron gene Covert infections a b s t r a c t Winter moth. brumata nucleopolyhedrovirus (OpbuNPV) in winter moth larvae collected from field sites in Massachusetts

Elkinton, Joseph

29

Short communication Hydrogen peroxide induce modifications of human extracellular  

E-print Network

Short communication Hydrogen peroxide induce modifications of human extracellular superoxide of superoxide in the extracellular space by catalyzing the dismutation of superoxide into hydrogen peroxide and molecular oxygen. In addition, the enzyme reacts with hydrogen peroxide in a peroxidase reaction which

Schierup, Mikkel Heide

30

Z .Developmental Brain Research 111 1998 143146 Short communication  

E-print Network

Z .Developmental Brain Research 111 1998 143­146 Short communication Cell death precedes rod Abstract We measured cell death in the retinas of embryonic and adult teleost fish using TUNEL staining death occurs in all three nuclear layers. The lack of a corresponding pattern of cell death

Fernald, Russell

31

SHORT COMMUNICATION Pattern, process and geographic modes of speciation  

E-print Network

SHORT COMMUNICATION Pattern, process and geographic modes of speciation B. M. FITZPATRICK*, J. A Synthesis, University of Tennessee, Knoxville, TN, USA Introduction Sympatric speciation has been of sympatric speciation might appear to come to different conclusions than those using population genetic

Gavrilets, Sergey

32

SHORT COMMUNICATION DOI: 10.1002/ejic.200800297  

E-print Network

SHORT COMMUNICATION DOI: 10.1002/ejic.200800297 Lanthanide-Hinged Calixarene Bicapsules: Discrete / Calixarenes / Supramolecular chemistry / Hydrothermal synthesis / Crsytal growth The dumbbell-like calixarene of calixarenes arranged into molec- ular capsules in which crown ethers or other related disc- shaped molecules

Gao, Song

33

SHORT COMMUNICATION White Storks, Ciconia ciconia, forage on rubbish dumps  

E-print Network

SHORT COMMUNICATION White Storks, Ciconia ciconia, forage on rubbish dumps in Poland--a novel on the foraging of White Storks on rubbish dumps, a novel behaviour in Central European populations, is presented one to 348 White Storks (median=2, N=116) were observed on rubbish dumps, and most of the records (86

Boyer, Edmond

34

Short Communication Event-driven model skill assessment  

E-print Network

Short Communication Event-driven model skill assessment Robert D. Hetland * Department have on the prediction of model skill, a commonly used metric of a model?s ability to reproduce observations. It is shown that the choice of climatology is as important in determining model skill as other

Hetland, Robert D.

35

SHORT COMMUNICATION A new procedure for making observations of embryo  

E-print Network

SHORT COMMUNICATION A new procedure for making observations of embryo morphology in dust-like seeds Uberla^ndia, Caixa Postal 593, Uberla^ndia, MG, 38400-902, Brazil Abstract Observing the embryo in dust is remarkably effective for direct observations of embryos in minute seeds, is reported here. Moreover

Herrera, Carlos M.

36

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

37

Short communication Fang tip spread, puncture distance, and  

E-print Network

Short communication Fang tip spread, puncture distance, and suction for snake bite Kelly R than their bases at rest, The Extractor1 , a device widely marketed in the United States for snake bite; hereafter Extractor) is widely marketed in the United States for venomous snake bite ®rst aid. This device

Zamudio, Kelly R.

38

Short communication Ion-implantation modification of lithiumphosphorus  

E-print Network

Short communication Ion-implantation modification of lithium­phosphorus oxynitride thin solid electrolytes, the lithium­phosphorus oxynitride (Lipon) electrolyte synthesized by sputtering to a reaction with the lithium metal, and the performance of a lithium battery starts to degrade [5,6]. Lithium­phosphorus

Park, Byungwoo

39

Short Communication Application of a bioenergetics model to roach  

E-print Network

Short Communication Application of a bioenergetics model to roach By F. Ho¨ lker1 and S. S. Haertel, Limnological Institute, Konstanz, Germany Summary A new set of bioenergetic parameters for adult roach (Rutilus laboratory studies with adult roach over a wide range of fish sizes (1.2­300 g) and water temperatures (5

40

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

41

Short communication Controlling nitrogen release from farm ponds with a  

E-print Network

Short communication Controlling nitrogen release from farm ponds with a subsurface outflow device deposition are all major sources of nitrogen (N) and phosphorus (P) to aquatic ecosystems (Carpenter et al and implementation of best management practices (BMPs) such as controlled drainage, riparian buffers and land a g r i

Cope, W. Gregory

42

Agricultural and Forest Meteorology 118 (2003) 137141 Short communication  

E-print Network

in understory PAR for a mixed deciduous forest in New England, USA Matthew M. Fladeland, Mark S. Ashton, Xuhui and Plusnin, 1945). It is classified as a mixed deciduous­coniferous forest with a tree canopy comprisedAgricultural and Forest Meteorology 118 (2003) 137­141 Short communication Landscape variations

Lee, Xuhui

43

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.

44

SHORT COMMUNICATION Hostparasite coevolution and patterns of adaptation across  

E-print Network

SHORT COMMUNICATION Host­parasite coevolution and patterns of adaptation across time and space S of coevolution between the bacteria Pseudo- monas fluorescens and its phage /2. Specifically, they measured the ability of phage populations from different time points to infect focal bacteria populations. They found

45

Short communication Powering microbial electrolysis cells by capacitor circuits charged  

E-print Network

Short communication Powering microbial electrolysis cells by capacitor circuits charged using. Introduction Microbial electrolysis cells (MECs) represent a promising method for using bacteria to convert produced by bacteria on the anode, hydrogen gas can be evolved at the cathode by additionally applying more

46

Short Communication Potential public health significance of faecal contamination  

E-print Network

Short Communication Potential public health significance of faecal contamination and multidrug s u m m a r y Objective: To assess the prevalence of faecal coliform bacteria and multiple drug of seawater during certain periods of the year. Density of faecal colifrom bacteria was estimated. E. coli

Mazumder, Asit

47

Soil Biology & Biochemistry 38 (2006) 35063510 Short communication  

E-print Network

Soil Biology & Biochemistry 38 (2006) 3506­3510 Short communication Simultaneous inhibition of CH4 by dissimilatory SO4 2? reducing bacteria (SRB), lacks supporting evidence. Here, we present data from an acid rain; Wetlands; Emissions; Acid rain; Bacteria; SRB; Methanogens; Bogs; Atmosphere; Competitive exclusion Sulphur

Gauci, Vincent

48

Oryx Vol 37 No 4 October 2003 Short Communication  

E-print Network

Oryx Vol 37 No 4 October 2003 Short Communication Satellite tracking of flamingos in southern. We carried out the first satellite tracking of flamingos in southern Africa to find out Africa, which to the Keywords Flamingos, migration, Phoeniconaias, Phoeni- copterus, satellite tracking, southern Africa

Richner, Heinz

49

SHORT COMMUNICATION Attraction of ants by an invasive Acacia  

E-print Network

SHORT COMMUNICATION Attraction of ants by an invasive Acacia MARKUS P. EICHHORN, LOUISE C. RATLIFFE be deprived of their co-evolved mutualists. In southern Portugal Acacia dealbata has become naturalised induction, extra-floral nectaries, invasive species, Linepithema humile, Portugal. Introduction Acacia trees

Nottingham, University of

50

Short Communication Discovery of a regionally important green turtle  

E-print Network

disorientation. We recommend initiation of an- nual monitoring and nest protection at the main green turtleShort Communication Discovery of a regionally important green turtle Chelonia mydas rookery and other Syrian beaches was undertaken to improve and update knowledge of Syria's marine turtle nesting

Exeter, University of

51

Short Communication Lens Defects and Age-Related Fiber Cell  

E-print Network

Short Communication Lens Defects and Age-Related Fiber Cell Degeneration in a Mouse ModelRNA alternative splicing in human and mouse lens and cornea favor longer, potentially more amyloidogenic forms augmenting expression.9,10 Alzheimer pathophysiology is linked with physiological oxidative stress

Frederikse, Peter

52

SHORT COMMUNICATION Tamarack and black spruce adventitious root patterns are  

E-print Network

SHORT COMMUNICATION Tamarack and black spruce adventitious root patterns are similar, accepted 15 May 2012. Veverica, T. J., Kane, E. S. and Kasischke, E. S. 2012. Tamarack and black spruce following wildfires in boreal black spruce forests can also be applied to mixed tamarack forests growing

53

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

54

Short communication Spherocyte shape transformation and release of tubular  

E-print Network

into heparinized tubes. The red blood cells were washed three times in a buffer (pH 7.4). The red blood cells were and methods Dodecylmaltoside was dissolved in the buffer. Human blood was drawn from authors by vein punctureShort communication Spherocyte shape transformation and release of tubular nanovesicles in human

Iglic, Ales

55

Short communication: An interpretation of the Linux entropy estimator  

E-print Network

[1] Random Number Generator which is a PRNG with entropy inputs. This generator has been studied polynomial interpolation. 2 Entropy 2.1 Theory side The entropy aims to compute the amount of informationShort communication: An interpretation of the Linux entropy estimator Benjamin Pousse benjamin

56

2000. The Journal of Arachnology 28:351352 SHORT COMMUNICATION  

E-print Network

351 2000. The Journal of Arachnology 28:351­352 SHORT COMMUNICATION ADANSONIA IS A BAOBAB TREE are familiar with the genus Ad- ansonia Linnaeus 1753, which contains the mag- nificent Baobab trees. The Baobabs are particularly prolific in Madagascar but also widely distributed in continental Africa, and one

Hormiga, Gustavo

57

SHORT COMMUNICATION Behaviour of brown bears killing wild ungulates  

E-print Network

SHORT COMMUNICATION Behaviour of brown bears killing wild ungulates in the Cantabrian Mountains /Published online: 11 November 2010 # Springer-Verlag 2010 Abstract Although brown bears (Ursus arctos documentation regarding bear predation on wild ungulates in Southern Europe. We describe search, detection

Boyer, Edmond

58

SHORT COMMUNICATION Prevalence of Haemophilus parasuis infection in hunted wild  

E-print Network

SHORT COMMUNICATION Prevalence of Haemophilus parasuis infection in hunted wild boars (Sus scrofa samples. The overall prevalence of H. parasuis in wild boars in Germany was 74.2%. H. parasuis a PCR assay to evaluate the prevalence and distribution of H. parasuis infection in wild boars

Boyer, Edmond

59

Short Communication Granta Gravel model of sandpile avalanches: towards critical  

E-print Network

2515 Short Communication Granta Gravel model of sandpile avalanches: towards critical fluctuations inspirant du modèle de "Granta Gravel", nous proposons une approche théo- rique des avalanches de billes ou plastiques et des effets de dilatance. On montre en particulier, que la taille des avalanches est controlée

Paris-Sud XI, Université de

60

Short Communication Performance enhancement of Willshaw type networks through  

E-print Network

2387 Short Communication Performance enhancement of Willshaw type networks through the use of limit contains. A general algorithm for simulating neural networks with sparsely coded patterns is also discussed of ones is much smaller than the num- ber of zeros or minus ones, has been of interest to the neural

Paris-Sud XI, Université de

61

Short communication Leaf optical properties and photosynthetic leaf absorptances  

E-print Network

Short communication Leaf optical properties and photosynthetic leaf absorptances in several-species variability in the leaf optical properties of eight large-bodied seagrasses, Posidonia australis, Posidonia of Australia. Leaf spectral transmittance [TL(l)], reflectance [RL(l)], and non-photosynthetic absorptance [AL

Durako, Michael J.

62

SHORT COMMUNICATION Gas-Phase Separations of Protease Digests  

E-print Network

SHORT COMMUNICATION Gas-Phase Separations of Protease Digests Stephen J. Valentine, Anne E University, Bloomington, Indiana, USA A mixture of peptides from a complete tryptic digest of ubiquitin has and identify peptides from a tryptic digest of ubiquitin. The mixture was electrosprayed into the gas phase

Clemmer, David E.

63

SHORT COMMUNICATIONS 587 The Condor 105:587592  

E-print Network

(dehydrogenation) than the usual red forms (oxidation at the C-4 or -4 positions), it seems that this genetic´lico dife- rente al de las formas rojas usuales (deshidrogenacio´n y oxidacio´n en las posiciones C-4 o -4SHORT COMMUNICATIONS 587 The Condor 105:587­592 The Cooper Ornithological Society 2003 CAROTENOID

McGraw, Kevin J.

64

proteinsSTRUCTURE O FUNCTION O BIOINFORMATICS SHORT COMMUNICATION  

E-print Network

proteinsSTRUCTURE O FUNCTION O BIOINFORMATICS SHORT COMMUNICATION Atomic contacts in protein- siderations for structure pre- diction, design, dynamics, and docking. Proteins 2007; 68:595­601. VVC 2007 Go¨ttingen, Germany INTRODUCTION Billions of years of evolution optimized proteins to fulfill

de Groot, Bert

65

Short Communication Phylogenetic relationships among iguanian lizards using alternative  

E-print Network

Short Communication Phylogenetic relationships among iguanian lizards using alternative for the major iguanian lizard lineages and several squamate out- groups using a combined analysis of 4950 of lepidosaur (lizard, snake, and Tuatara) genomic data has great potential to enhance our under- standing

Schulte, Jim

66

Short Communication Cytogenetics of Hispanic and White Children with Acute  

E-print Network

Short Communication Cytogenetics of Hispanic and White Children with Acute Lymphoblastic Leukemia Children's Hospital Oakland, Oakland, California Abstract Epidemiologic studies of childhood leukemia have;15(3):578­81) Introduction Leukemia is the most common malignancy diagnosed among children in the United States. Chromosomal

California at Berkeley, University of

67

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

68

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

E-print Network

Short Communication Extraversion predicts individual differences in women's face preferences Lisa L.M. Welling a,*, Lisa M. DeBruine a , Anthony C. Little b , Benedict C. Jones a a School of Psychology, University of Aberdeen, Scotland, UK b School of Psychology, University of Stirling, Scotland, UK a r t i c l

Little, Tony

69

Short communication Do desiccation tolerances control the vertical distribution  

E-print Network

Short communication Do desiccation tolerances control the vertical distribution of intertidal of Biological Sciences, Life Sciences Building, Room 124, Mobile, AL 36688, USA c University of Washington of study by marine ecologists and phycologists for more than a century (Davison and Pearson, 1996

Sherman, Tim

70

Journal of Biomechanics 38 (2005) 19381942 Short communication  

E-print Network

Journal of Biomechanics 38 (2005) 1938­1942 Short communication Simulated parallel annealing within a neighborhood for optimization of biomechanical systems J.S. Higginsona,b , R.R. Neptunec , F.C. Andersonb, Biomechanical Engineering Division, Stanford University, Clark Center, S-342 (MC 5450), 318 Campus Drive

71

Short communication Fractal in fracture of bulk metallic glass  

E-print Network

planes, leading to ductile and brittle fracture, respectively. Unlike long-range slip in crystals the ductile-to-brittle transition in MGs [21,24e26]. The STZ-under- pinned ductile fracture plane has beenShort communication Fractal in fracture of bulk metallic glass M.Q. Jiang a,b , J.X. Meng a , J

Gao, Jianbo

72

SHORT COMMUNICATION Characterisation of serial order encoding in monkey anterior  

E-print Network

SHORT COMMUNICATION Characterisation of serial order encoding in monkey anterior cingulate sulcus working memory task with only one component. Methods Two male rhesus monkeys (M and P) were trained to sit were recorded in monkey M using the scleral search coil technique. A moving eye-position window centred

Paris-Sud XI, Université de

73

SHORT COMMUNICATION DOI: 10.1002/ejic.200700302  

E-print Network

by the reaction of [bis(catechol)salen]MnIII with several di- and trivalent metal ions is reported. These polymers-catechol-functionalized (salen)MnIII complexes on alumina membranes.[7] The modified membranes functioned well as heterogeneousSHORT COMMUNICATION DOI: 10.1002/ejic.200700302 [Bis(catechol)salen]MnIII Coordination Polymers

74

Short communication Hedgehog structure in nematic and magnetic systems  

E-print Network

1097 Short communication Hedgehog structure in nematic and magnetic systems N. Schopohl and T structure of hedgehog point disclinations in magnetic and nematic liquid crystal systems is investigated. In the nematic hedgehog the solution is uniaxial everywhere. Nematic hedgehogs are very much larger than magnetic

Paris-Sud XI, Université de

75

Short Communication Homeostatically regulated spontaneous neuronal discharges  

E-print Network

receptors Michael A. Corner, Robert E. Baker, Jaap van Pelt Netherlands Institute for Neuroscience are highly resistant to attempts to suppress neuronal firing by blocking ionotropic glutamate receptors: not only can kainate receptors partly substitute for NMDA- and AMPA-mediated neurotransmission when

van Pelt, Jaap

76

Knnen & Brandsma 8 September 2004 SHORT COMMUNICATION  

E-print Network

instrumental data; sea level pressure; data bases, historical climatology; Europe #12;Können & Brandsma 8 of the questions raised, has lead to a rehabilitation of historical data of high temporal resolution. One track the close of the 17th century: Leiden (The Netherlands) (Instrumental 17th century pressure observations) G

Brandsma, Theo

77

Knnen & Brandsma February 2005 SHORT COMMUNICATION  

E-print Network

; sea level pressure; data bases, historical climatology; Europe #12;Können & Brandsma February 2005 3 lead to a rehabilitation of historical data of high temporal resolution. One track Netherlands) (Instrumental 17th century pressure observations) G.P. Können and T. Brandsma Royal Netherlands

Brandsma, Theo

78

Crop Protection 22 (2003) 11311134 Short communication  

E-print Network

of ozone gas exposure during storage for the treatment of fresh produce is limited to highly vented-FDA, 2001). For the postharvest treatment of fresh fruits and vegetables, ozone can be used as a relatively cold storage Llu!is Paloua , Joseph L. Smilanickb, *, Carlos H. Crisostoa , Monir Mansourb , Pilar

Crisosto, Carlos H.

79

Reconfigurable circularly polarized antenna for short-range communication systems  

Microsoft Academic Search

This paper describes the design rules of a compact microstrip patch antenna with polarization reconfigurable features (right-handed circular polarization (CP)\\/left-handed CP). The basic antenna is a circular coplanar-waveguide (CPW)-fed microstrip antenna excited by a diagonal slot and the CPW open end. This device is developed for short-range communications or contactless identification systems requiring polarization reconfigurability to optimize the link reliability.

Hakim Assat; Laurent Cirio; Marjorie Grzeskowiak; Jean-Marc Laheurte; Odile Picon

2006-01-01

80

Short Communication Language-dependent pitch encoding advantage in the brainstem is not limited  

E-print Network

Short Communication Language-dependent pitch encoding advantage in the brainstem is not limited Article history: Accepted 12 May 2010 Available online 8 June 2010 Keywords: Auditory Human Brainstem in the auditory brainstem has been observed for only specific portions of native pitch contours exhibiting high

Dasgupta, Dipankar

81

Short Communication Single-Walled Carbon Nanotube Based Real-Time  

E-print Network

Short Communication Single-Walled Carbon Nanotube Based Real-Time Organophosphate Detector Ningyi Abstract A novel single-walled carbon nanotube (SWNT) based biosensor for real-time detection- gle-walled carbon nanotubes (SWNTs), exhibit high sensi- tivity to variations of surrounding

Chen, Wilfred

82

When the facts are just not enough: Credibly communicating about risk is riskier when emotions run high and time is short  

SciTech Connect

When discussing risk with people, commonly subject matter experts believe that conveying the facts will be enough to allow people to assess a risk and respond rationally to that risk. Because of this expectation, experts often become exasperated by the seemingly illogical way people assess personal risk and choose to manage that risk. In crisis situations when the risk information is less defined and choices must be made within impossible time constraints, the thought processes may be even more susceptible to faulty heuristics. Understanding the perception of risk is essential to understanding why the public becomes more or less upset by events. This article explores the psychological underpinnings of risk assessment within emotionally laden events and the risk communication practices that may facilitate subject matter experts to provide the facts in a manner so they can be more certain those facts are being heard. Source credibility is foundational to risk communication practices. The public meeting is one example in which these best practices can be exercised. Risks are risky because risk perceptions differ and the psychosocial environment in which risk is discussed complicates making risk decisions. Experts who want to influence the actions of the public related to a threat or risk should understand that decisions often involve emotional as well as logical components. The media and other social entities will also influence the risk context. The Center for Disease Control and Prevention's crisis and emergency-risk communication (CERC) principles are intended to increase credibility and recognize emotional components of an event. During a risk event, CERC works to calm emotions and increase trust which can help people apply the expertise being offered by response officials.

Reynolds, Barbara J., E-mail: Bsr0@cdc.gov

2011-07-15

83

High current short pulse ion sources  

SciTech Connect

High current short pulse ion beams can be generated by using a multicusp source. This is accomplished by switching the arc or the RF induction discharge on and off. An alternative approach is to maintain a continuous plasma discharge and extraction voltage but control the plasma flow into the extraction aperture by a combination of magnetic and electric fields. Short beam pulses can be obtained by using a fast electronic switch and a dc bias power supply. It is also demonstrated that very short beam pulses ({approximately} 10 {micro}s) with high repetition rate can be formed by a laser-driven LaB{sub 6} or barium photo-cathode.

Leung, K.N. [Lawrence Berkeley National Lab., CA (United States). Accelerator and Fusion Research Div.

1996-08-01

84

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

85

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

E-print Network

Short Communication Effect of exogenous electron shuttles on growth and fermentative metabolism) and hydrogen (Reimann et al., 1996). Anaerobic fermentative bacteria belonging to the genus Clos- tridia

Johnson, Peter D.

86

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

87

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 glomerata; Phenoloxidase; Disease resistance; Oyster 1. Introduction The Sydney rock oyster, Saccostrea

Raftos, David

88

Short Communication Vertical distribution of barnacle larvae at a fixed nearshore station in southern  

E-print Network

Short Communication Vertical distribution of barnacle larvae at a fixed nearshore station Keywords: Barnacle larvae Chthamalus Balanus vertical distribution stage-specific southern California among populations. We present observations on the vertical distribution of barnacle larvae from southern

Pineda, Jesús

89

Short Communication Electricity generation from fermented primary sludge using single-chamber  

E-print Network

Short Communication Electricity generation from fermented primary sludge using single-chamber air). The microbial fuel cell (MFC) is a nascent technology that uses bacteria to oxidize organic matter and produce

90

Short communication Performance of microbial fuel cells with and without Nafion solution as cathode  

E-print Network

Short communication Performance of microbial fuel cells with and without Nafion solution as cathode as biocatalysts [1­4]. Bacteria have been identified to be capable of generating electricity from the anaerobic

91

Short Communication Functional ear (a)symmetry in brainstem neural activity relevant to encoding  

E-print Network

Short Communication Functional ear (a)symmetry in brainstem neural activity relevant to encoding Keywords: Auditory Human Brainstem Pitch Language Mandarin Chinese Fundamental frequency-following response areas. This experiment investigates whether ear asymmetries vary in brainstem representation of pitch

Dasgupta, Dipankar

92

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.

93

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.

94

Toward understanding characteristics of dedicated short range communications (DSRC) from a perspective of vehicular network engineers  

Microsoft Academic Search

IEEE 802.11p-based Dedicated Short Range Communications (DSRC) is considered a promising wireless technology for enhancing transportation safety and improving highway efficiency. Here, using a large set of empirical measurement data taken in a rich variety of realistic driving environments, we attempt to characterize communication properties of DSRC as well as to analyze the causes of communication loss. Specifically, from a

Fan Bai; Daniel D. Stancil; Hariharan Krishnan

2010-01-01

95

593Neumann et al.--Photo-identification of common dolphins Short communication  

E-print Network

593Neumann et al.--Photo-identification of common dolphins Short communication Photo-identification of short-beaked common dolphins (Delphinus delphis) in north-east New Zealand: a photo-beaked common dolphins (Delphinus delphis L.). We present here the results of two studies that were conducted

Stockin, Karen

96

Dedicated short range communications (DSRC) for intelligent transport system  

Microsoft Academic Search

In an effort to develop a complete DSRC system for ITS application, the authors have studied a lot of experimental facts which they are exploiting for the design. The wireless technology has been chosen properly which is capable of tackling the severe interferences present in the open road. For road to car communication, a combined digital technology like spread spectrum

Rabindranath Bera; Jitendranath Bera; Sanjib Sil; Sudip Dogra; Nirmalendu Bikas Sinha; D. Mondal

2006-01-01

97

Biosensors and Bioelectronics 21 (2005) 523527 Short communication  

E-print Network

biosensor for p-nitrophenol using Moraxella sp.-modified carbon paste electrode Priti Mulchandani, Carlos M of hydroquinone formed in biodegradation of p-nitrophenol was measured at Moraxella sp.-modified carbon paste (short-term) inhalation or ingestion of p-nitrophenol in humans causes headaches, drowsiness, nausea

Chen, Wilfred

98

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.

99

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

100

Experimental Measurements and Modeling for Vehicle-to-Vehicle Dedicated Short Range Communication (DSRC) Wireless Channels  

Microsoft Academic Search

The dedicated short range communication (DSRC) standard (also known as IEEE 802.11p) can be used to enable a number of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) wireless radio communication based active safety and telematics applications. In this paper, we briefly document various experimental measurement scenarios and characterize performance of the DSRC standard based radio modules in ldr Additive White Gaussian Noise

Vikas Kukshya; Hariharan Krishnan

2006-01-01

101

Short range RF communication for jet engine control  

NASA Technical Reports Server (NTRS)

A method transmitting a message over at least one of a plurality of radio frequency (RF) channels of an RF 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 RF channels. The characteristics of the jamming pulses in the at least one of the plurality of RF 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 RF channels wherein the message is transmitted within the interstices of the jamming pulse determined from the step of determining characteristics of the jamming pulses.

Sexton, Daniel White (Inventor); Hershey, John Erik (Inventor)

2007-01-01

102

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

103

Short communication Energy storage via polyvinylidene fluoride dielectric on the  

E-print Network

element, typical strategies reported to date include dye-sensitized solar cell (DSSC)/Li battery, DSSC as active materials to fabricate a two- electrode DSSC-like photocapacitor, which showed high photo

Jiang, Hongrui

104

Short communication The composite rods of MnO and multi-walled carbon nanotubes as  

E-print Network

nanotube Composite Anode Lithium ion battery a b s t r a c t The composite of manganese monoxide and multiO as an anode material for lithium ion batteries are significantly improved. The MnO/MWNTs composite showsShort communication The composite rods of MnO and multi-walled carbon nanotubes as anode materials

Ceder, Gerbrand

105

SHORT COMMUNICATIONS Energetic Cost of Insecticide Resistance in Culex pipiens Mosquitoes  

E-print Network

SHORT COMMUNICATIONS Energetic Cost of Insecticide Resistance in Culex pipiens Mosquitoes A. RIVERO, insecticide resistance would deplete the energetic stores of vectors, reducing the energy available for other. Here we test this hypothesis by quantifying the energetic resources (lipids, glycogen, and glucose

Rivero, Ana

106

Short Communication ELUCIDATING THE GENETIC BASIS FOR ESCHERICHIA COLI DEFENSE AGAINST  

E-print Network

.g., salts, colloidal, nanoparticles), released silver ions (Agþ ) are proposed to be the principalShort Communication ELUCIDATING THE GENETIC BASIS FOR ESCHERICHIA COLI DEFENSE AGAINST SILVER and defense mechanisms against silver are poorly understood at the genetic level. A library of Escherichia

Alvarez, Pedro J.

107

Short communication Control of brown rot of stone fruits by brief heated water immersion treatments  

E-print Network

Short communication Control of brown rot of stone fruits by brief heated water immersion treatments. Several studies have shown that hot water treatments by themselves or in combination with other treatments they require are an issue that has hindered the commercial adoption of hot water treatments. While higher water

Crisosto, Carlos H.

108

Short communication Cost-effective abundance estimation of rare animals: Testing performance  

E-print Network

Short communication Cost-effective abundance estimation of rare animals: Testing performance of conservation concern, any cost-effective attempt to estimate absolute abundance will assist status assessments; Sinha, 2002; Rojas-Bracho et al., 2006). The difficulty of providing cost-effective estimates

109

SHORT COMMUNICATIONS 715 WilsonBull., 102(4), 1990, pp. 715-720  

E-print Network

SHORT COMMUNICATIONS 715 WilsonBull., 102(4), 1990, pp. 715-720 Within-forest preferences of Wood distribute themselves within forests. Several tropical resident species have been shown to prefer treefall gaps in tropical forests (Willis and Oniki 1972, Stiles 1975, Gradwohl and Greenberg 1980, Schemske

Winker, Kevin

110

Short communication Termites promote soil carbon and nitrogen depletion: Results from an  

E-print Network

directly. In this study, we collected soil (histic lithosol, inceptisols, USDA soil taxonomy, Malhi et alShort communication Termites promote soil carbon and nitrogen depletion: Results from an in situ of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK b Soil

Malhi, Yadvinder

111

Short Communication Anisometric charge dependent swelling of porous carbon in an  

E-print Network

Short Communication Anisometric charge dependent swelling of porous carbon in an ionic liquid F in these studies, carbon expansion is an intrinsic property that occurs with or without the presence of a polymer binder. The expansion also depends on the ion size, with enhanced swelling occurring when the average

Bazant, Martin Z.

112

Short communication Carbon nanoporous layer for reaction location management and performance  

E-print Network

: All-vanadium redox flow batteries Polarization Carbon paper Reaction location Carbon nanotube a bShort communication Carbon nanoporous layer for reaction location management and performance enhancement in all-vanadium redox flow batteries M.P. Manahan a , Q.H. Liu b , M.L. Gross c , M.M. Mench b

Mench, Matthew M.

113

Short communication Effect of vanadium redox species on photoelectrochemical behavior of TiO2  

E-print Network

. This is attributed to the hole scavenging process initiated by quick redox reaction and depressed chargeShort communication Effect of vanadium redox species on photoelectrochemical behavior of TiO2 TiO2/WO3 Photoelectrochemical cell Vanadium redox Photocharge/discharge a b s t r a c

Liu, Fuqiang

114

Short communication All-vanadium redox photoelectrochemical cell: An approach to store  

E-print Network

24 May 2014 Keywords: Photoelectrochemical reaction Solar energy storage Vanadium redox Solar energy by photoelectro- chemical (PEC) cells [5­7] using photocatalytic reactions of redox spe- cies. Utilizing two setsShort communication All-vanadium redox photoelectrochemical cell: An approach to store solar energy

Liu, Fuqiang

115

Short Communication to SMI 2011 Volumetric colon wall unfolding using harmonic differentials  

E-print Network

for polyps, the precursors of cancer, located on the colon wall. This has traditionally been accomplishedShort Communication to SMI 2011 Volumetric colon wall unfolding using harmonic differentials Wei t Volumetric colon wall unfolding is a novel method for virtual colon analysis and visualization with valuable

116

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 of these potential barriers affected the resident population of native brook trout (Salvelinus fontinalis). Despite and the limited extent of population change in brook trout indicate that dam removal had a minor effect

Stanley, Emily

117

SHORT COMMUNICATION A PLESIOSAUR CONTAINING AN ICHTHYOSAUR EMBRYO AS STOMACH CONTENTS  

E-print Network

SHORT COMMUNICATION A PLESIOSAUR CONTAINING AN ICHTHYOSAUR EMBRYO AS STOMACH CONTENTS FROM Herein we report the discovery of an ichthyosaur embryo from the Upper Member of the Sundance Formation (Oxfordian) of the Bighorn Basin, Wyoming. The specimen is the first known ichthyosaur embryo from the Upper

Socha, Jake

118

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

119

SHORT SCIENTIFIC COMMUNICATION Acoustic recordings in human ear canals to sounds  

E-print Network

SHORT SCIENTIFIC COMMUNICATION Acoustic recordings in human ear canals to sounds at different for different sound locations in an anechoic chamber. For humans, we embedded microphones in ear molds that were custom fitted to the subject's ear canal. For the ball, the microphones were flush with the surface at 90

Oliver, Douglas L.

120

Short Communication Phase transformation of single crystal h-tungsten nanorods  

E-print Network

Short Communication Phase transformation of single crystal h-tungsten nanorods at elevated 2005 Elsevier B.V. All rights reserved. Keywords: Tungsten; h-tungsten; A15; Phase transformation; Oblique angle deposition; Glancing angle deposition; Nanorods; Nanocolumns In recent decades, tungsten

Wang, Gwo-Ching

121

European Journal of Neuroscience, Vol. 9, pp. 1789-1794, 1997 @ European Neuroscience Association SHORT COMMUNICATION  

E-print Network

SHORT COMMUNICATION Spatial View Cells in the Primate Hippocampus Edmund T. Rolls, Robert G. Robertson a spatial component normally provides part of the context. Damage to the temporal lobe that includes, the monkey was not afforded -the opportunity to actively explore (Rolls and O'Mara, 1995). We performed

Rolls, Edmund T.

122

Short communication The sea urchin embryo as a model for studying  

E-print Network

Short communication The sea urchin embryo as a model for studying efflux transporters: Roles of Stanford University, Pacific Grove, CA 93950, USA Abstract We describe the use of the sea urchin as a model: Efflux transporters; p-Glycoprotein; Sea urchin; Apoptosis; Energetics It is well appreciated that efflux

123

Short communication All joint moments significantly contribute to trunk angular acceleration  

E-print Network

Short communication All joint moments significantly contribute to trunk angular acceleration: Accepted 19 April 2010 Keywords: Gait Trunk control Balance Angular acceleration Sensitivity a b s t r a c can produce linear and angular acceleration of all body segments (including those on which the moment

124

Inferring Social Ties in Academic Networks Using Short-Range Wireless Communications  

E-print Network

Inferring Social Ties in Academic Networks Using Short-Range Wireless Communications Igor ties of users from their location and co-location traces but they lack one important component publicly. Users' social ties are no exception either, as several stud- ies on ubiquitous computing have

Paris-Sud XI, Université de

125

Short communication Using lipid analysis and hyphal length to quantify AM and saprotrophic  

E-print Network

Short communication Using lipid analysis and hyphal length to quantify AM and saprotrophic fungal) and saprotrophic fungal (SF) biomass in three Hawaiian soils along a natural soil fertility gradient. Phospholipids16:1u5c and 18:2u6,9c were used as an index of AM and saprotrophic fungal biomass, respectively. Both

Treseder, Kathleen K.

126

SHORT COMMUNICATION Tetrodotoxin affects survival probability of rough-skinned newts  

E-print Network

SHORT COMMUNICATION Tetrodotoxin affects survival probability of rough-skinned newts (Taricha predators and prey die during interactions? We examined the interaction between the rough-skinned newt- logical resistance to TTX. Whether the newts' toxin confers protection from snake predators or has been

Brodie III, Edmund D.

127

Short Communication A rapid selection strategy for an anodophilic consortium for microbial fuel cells  

E-print Network

Short Communication A rapid selection strategy for an anodophilic consortium for microbial fuel bacteria that oxidize organic matter and transfer electrons to the anode (Logan, 2008). Pure exo-reducing bacteria (DMRB) (Nevin et al., 2008), we developed a rapid selection method to obtain an anodophilic

128

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

E-print Network

Short communication Metatranscriptome analysis of lactic acid bacteria during kimchi fermentation January 2009 Keywords: Metagenome Metatranscriptome GPM Kimchi Lactic acid bacteria We constructed genome probing microarrays (GPM) that are specific to 39 lactic acid bacteria (LAB) in an effort to monitor

Bae, Jin-Woo

129

Short communication A microbial fluidized electrode electrolysis cell (MFEEC) for enhanced  

E-print Network

Short communication A microbial fluidized electrode electrolysis cell (MFEEC) for enhanced hydrogen surface area for growth of exoelectrogenic bacteria. The use of this exoelectrogenic biofilm on the GAC based on water splitting reactions [3]. In an MEC, exoelectrogenic bacteria on the anode spontaneously

130

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 cellsH changes, and a pH be- low $6 can inhibit current generation by exoelectrogenic bacteria on the anode (Gil., 2007). Zwitterionic buffers can be toxic to bacteria as metals tend to remain more bio- available than

131

Short communication Do we need to understand microbial communities to predict  

E-print Network

Short communication Do we need to understand microbial communities to predict ecosystem function to address a fundamental question in ecosystem ecology: do we need to better understand microbial communities that contained both edaphic factors and community data did not explain significantly more variation in process

Cleveland, Cory

132

Short communication Biosensor based on chemically-designed anchorable cytochrome c  

E-print Network

Short communication Biosensor based on chemically-designed anchorable cytochrome c Chemical manipulation Oxidative stress Aquatic cells a b s t r a c t A novel third generation biosensor and the so-made amperometric biosensor was able to perform real-time and non- invasive detection

Dalang, Robert C.

133

SHORT COMMUNICATION A note on meat quality traits of pheasants (Phasianus colchicus)  

E-print Network

SHORT COMMUNICATION A note on meat quality traits of pheasants (Phasianus colchicus) Peter Hofbauer-Verlag 2010 Abstract Meat yield, proximate composition, pH and drip loss of breast and thigh muscles were 30 N/cm2 . Keywords Pheasant meat . Proximate composition . Drip loss . pH . Cooking loss . Colour

Paris-Sud XI, Université de

134

Short communication Self-correlation between assimilation and respiration resulting from flux  

E-print Network

Short communication Self-correlation between assimilation and respiration resulting from flux production (GEP, or assimilation) and ecosystem respiration (ER) is necessary to improve understanding-correlation between estimates of assimilation and respiration of carbon is a consequence of the flux partitioning

Vickers, Dean

135

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 soil respiration variation Tropical montane cloud forest Litter respiration a b s t r a c t Respiration in respiration rate in the litter, which were partly correlated with the soil surface air temperature. Most

Malhi, Yadvinder

136

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

137

Short communication Enhanced autonomic shutdown of Li-ion batteries by polydopamine  

E-print Network

Short communication Enhanced autonomic shutdown of Li-ion batteries by polydopamine coated Accepted 9 July 2014 Available online 17 July 2014 Keywords: Li-ion batteries Thermal shutdown Polyethylene binder, applied onto a battery anode surface, dried, and incorporated into Li-ion coin cells. FTIR

Sottos, Nancy R.

138

Short Communication Amphibian-killing fungus loses genetic diversity as it spreads across the New World  

E-print Network

Short Communication Amphibian-killing fungus loses genetic diversity as it spreads across the New December 2011 Available online 29 December 2011 Keywords: Amphibian declines Batrachochytrium dendrobatidis to identify factors driving disease out- breaks. Amphibian chytridiomycosis is a recently emerged amphibian

Zamudio, Kelly R.

139

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 and age on liver morphology and biochemistry was characterized, while evaluating the potential of 15 min) to suppress lipid accumulation in the liver. Following a 36-week protocol (animals 43 weeks of age

140

Short communication Complementary effects of disturbance by livestock and marmots on the spatial  

E-print Network

Short communication Complementary effects of disturbance by livestock and marmots on the spatial, with and without marmots, and ungrazed sites, with and without marmots. We subdivided each plot into quadrats not differ significantly between grazed and ungrazed plots; however, it was higher under marmot disturbance

Schweik, Charles M.

141

Short communication Pollinators are attracted to mounds created by burrowing animals (marmots)  

E-print Network

Short communication Pollinators are attracted to mounds created by burrowing animals (marmots of insect-pollinated plant species; the number of inflorescences; and the number of pollinators in a marmot colony on the Mongolian steppe. We compared these parameters on and off marmot mounds and searched

Schweik, Charles M.

142

Short Communication Paecilomyces farinosus destroys powdery mildew colonies in detached leaf cultures  

E-print Network

Short Communication Paecilomyces farinosus destroys powdery mildew colonies in detached leaf, detached leaf culture, fungal antagonist Abstract Since 2001, several isolates of Blumeria graminis in leaf cultures but neither conidial suspensions nor cell-free culture filtrates of P. farinosus isolates

Brown, James

143

SHORT COMMUNICATION Testing taxonomic boundaries and the limit of DNA barcoding in the  

E-print Network

SHORT COMMUNICATION Testing taxonomic boundaries and the limit of DNA barcoding in the Siberian of Invertebrate Zoology, American Museum of Natural History, New York, USA, 3 School of Marine and Atmospheric Canadian Barcode of Life Network, Biodiversity Institute of Ontario, Guelph, Ont., Canada, 5 Department

DeSalle, Rob

144

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

145

Short Communication A mega-herd of more than 200,000 Mongolian  

E-print Network

Short Communication A mega-herd of more than 200,000 Mongolian gazelles Procapra gutturosa to the observation of a historically large Mongolian gazelle Procapra gutturosa herd (. 200,000). A model developed to predict gazelle occurrence based on satellite imagery of vegetation productivity correctly identi- fied

Schweik, Charles M.

146

DOI 10.1007/s10071-010-0347-4 SHORT COMMUNICATION  

E-print Network

Anim Cogn DOI 10.1007/s10071-010-0347-4 123 SHORT COMMUNICATION Big brains are not enough. Keywords Comparative cognition · General intelligence · Behavioural inhibition · Ara chloroptera · Cacatua sulphurea · Nestor notabilis Introduction The question of why some animal species evolved higher cognitive

Indiana University

147

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

E-print Network

combination of these two attributes. We found that the espera hunting method allows very selective harvestingSHORT COMMUNICATION Wild boar (Sus scrofa) harvesting using the espera hunting method: side effects # Springer-Verlag 2010 Abstract Harvesting of wildlife by man has been linked to demographic and evolutionary

Paris-Sud XI, Université de

148

1776 Brief Communication Short 5 -phosphorylated double-stranded RNAs induce RNA  

E-print Network

effect on the were actually transferred. The dsRNA induced a strong silencing potential, indicating1776 Brief Communication Short 5 -phosphorylated double-stranded RNAs induce RNA interference quence-specific RNA degradation in an in vitro system as well as in insect and mammalian tissue culture

Delidakis, Christos

149

Short communication Nonlinear analysis of gait kinematics to track changes in oxygen consumption  

E-print Network

Short communication Nonlinear analysis of gait kinematics to track changes in oxygen consumption the effectiveness of dynamical systems and fractal analysis in this study. Further, we selected, oxygen consumption. For the fractal analysis, utilizing stride interval data, we calculated fractal dimension. For the dynamical

Chelidze, David

150

SHORT COMMUNICATION Women infected with parasite Toxoplasma have more sons  

E-print Network

- ical and physiological parameters of the host, we analyzed the effect of latent toxoplasmosis on sex. The toxoplasmosis associated with immunosuppression or immunomodulation might be re- sponsible for the enhanced survival of male embryos. In light of the high prevalence of latent toxoplasmosis in most countries

Flegr, Jaroslav

151

Short communication Insights into the management of sea turtle internesting  

E-print Network

ARCHELON, The Sea Turtle Protection Society of Greece, Solomou 57, 10432 Athens, Greece A R T I C L E I N F) in the waters off the nesting beach. Adequate protection of turtles in the internesting area requires knowledge energy expenditure. Turtles showed no obvi- ous preference for the highly protected area of the bay

Richner, Heinz

152

Polymer Testing 26 (2007) 614618 Short Communication: Test Method  

E-print Network

on mass production than on the field of compounding, which is dominated by small and medium-sized enterprises. Consequently, it lies with the latter to offer highly customized products at low prices, especially in the near infrared (NIR) frequency range [5,6]. However, each method is restricted to a small

Mittleman, Daniel

153

Brain Research 660 (\\994) 337-340 Short communication  

E-print Network

or oral ad libitum monosodium glutamate administration on striatal glutamate release, as measured using-11. L'SA Accepted 26 July 1994 Abstract We examined effects of high doses of monosodium glutamate (MSG/kg/h) was ineffective. Keywords: Monosodium glutamate; Glutamate release; Microdialysis; Striatum Glutamate

Wurtman, Richard

154

Journal of Sound and Vibration 286 (2005) 637644 Short Communication  

E-print Network

, for example, those that are combinations of follower and axial loads [2], as well as variable that is ejected from a nozzle fixed to the free end of a cantilever beam [4]. The convection of fluid along microscopes [9], and high-density data storage devices [10]. In these applications, variability

155

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.

156

SHORT COMMUNICATION: An image processing approach to calibration of hydrometers  

NASA Astrophysics Data System (ADS)

The usual method adopted for multipoint calibration of glass hydrometers is based on the measurement of the buoyancy by hydrostatic weighing when the hydrometer is plunged in a reference liquid up to the scale mark to be calibrated. An image processing approach is proposed by the authors to align the relevant scale mark with the reference liquid surface level. The method uses image analysis with a data processing technique and takes into account the perspective error. For this purpose a CCD camera with a pixel matrix of 604H 576V and a lens of 16 mm focal length were used. High accuracy in the hydrometer reading was obtained as the resulting reading uncertainty was lower than 0.02 mm, about a fifth of the usual figure with the visual reading made by an operator.

Lorefice, S.; Malengo, A.

2004-06-01

157

SHORT COMMUNICATION Carotenoid-dependent coloration of male American kestrels  

E-print Network

Abstract The signaling function of sexually selected traits, such as carotenoid-dependent avian plumage coloration, has received a great deal of recent attention especially with respect to parasitism and immunocompetence. We argue that parasite-mediated models of sexual selection may have an implicit temporal component that many researchers have ignored. For example, previous studies have demonstrated that carotenoid-dependent traits can signal past parasite exposure, current levels of parasitism, or the ability of individuals to manage parasitic infections in the future. We examined repeated measures of carotenoid-dependent skin color and blood parasitism in American kestrels (Falco sparverius) to distinguish whether coloration might signal current parasitism or the potential to deal with infections in the future. We found no evidence that coloration was related to current levels of parasitism in either sex. However, coloration of males significantly predicted their response to parasitism; males with bright orange coloration during prelaying, when mate choice is occurring, were more likely than dull yellow males to reduce their levels of infection by the time incubation began. Coloration during prelaying may advertise a males health later in the breeding season. For kestrels, the ability to predict future health would be highly beneficial given the males role in providing food to his mate and offspring. Coloration of

Russell D. Dawson; Gary R. Bortolotti; R. D. Dawson; G. R. Bortolotti

158

Managing high IC yields with short cycle times  

Microsoft Academic Search

High IC yields are the key to low product costs, essential for profitable pursuit of high volume GaAs IC markets for consumer applications. Short product development cycle times are essential for getting entry into such markets. Technology has been moving at a fast pace and product life cycles are getting shorter. Short development cycle times are needed not only to

S. Khetan; P. Fowler

1995-01-01

159

Short communication  

PubMed Central

To achieve an adequate response, cells of the immune system must be tightly regulated to avoid hypo- or hyper-responsiveness. One of the mechanisms used by the immune system to avoid excessive inflammation is the modulation of the response through inhibitory receptors containing immunoreceptor tyrosine based inhibitory motifs (ITIM). Here, we show that human neutrophils from peripheral blood express the ITIM containing CD300a (also known as IRp60 and CMRF-35H) receptor. By using the HL-60 differentiation model, we show that the expression of CD300a receptor is developmentally regulated. Stimulation of human neutrophils with LPS and GM-CSF increased the cell surface expression of CD300a as a result of the rapid translocation of an intracellular pool of the receptor to the cell surface. Co-ligation of CD300a with the immunoreceptor tyrosine based activating motif (ITAM) containing CD32a (Fc?RIIa) activation receptor inhibited CD32a mediated signaling, whereas it did not inhibit Toll like receptor (TLR)-4 mediated reactive oxygen species (ROS) production. Therefore, at least for human neutrophils, the inhibitory signals mediated by the CD300a receptor may be selective in their action. PMID:17588661

Alvarez, Yelina; Tang, Xiaobin; Coligan, John E.; Borrego, Francisco

2007-01-01

160

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

161

agronomie: plant genetics and breeding -short communication Prsence au Maroc de la race 2 de Plasmopara  

E-print Network

agronomie: plant genetics and breeding - short communication Présence au Maroc de la race 2 de évidence l'existence, en plus de la race 1 dite race «Européenne», d'une race plus virulente qui a le même comportement que la race 2 améri- caine. Helianthus annuus = tournesol / Plasmopara halstedii = mildiou / race

Paris-Sud XI, Université de

162

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

163

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 China Sea in summer using satellite-derived sea surface temperatures (SSTs), chlorophyll-a (Chl a that the satellite-derived pCO2 was in general agreement with the in situ observations. The air­sea CO2 flux

164

Efficient High Performance Collective Communication for Distributed Memory Environments  

ERIC Educational Resources Information Center

Collective communication allows efficient communication and synchronization among a collection of processes, unlike point-to-point communication that only involves a pair of communicating processes. Achieving high performance for both kernels and full-scale applications running on a distributed memory system requires an efficient implementation of

Ali, Qasim

2009-01-01

165

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

166

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

167

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

Microsoft Academic Search

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

James Benet

1993-01-01

168

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

169

COMMUNICATION TO THE EDITOR High Cell Density Culture of  

E-print Network

COMMUNICATION TO THE EDITOR High Cell Density Culture of Metabolically Engineered Escherichia coli- tation processes employing several different bacteria have been developed to improve PHB productivity

170

High efficiency switching-mode amplifiers for wireless communication systems.  

E-print Network

??Switching-mode amplifiers represent attractive possibilities for RF wireless communication systems because their high efficiency can potentially extend the battery life time for portable devices, lower (more)

Hung, Tsai-Pi

2008-01-01

171

Improvement methods of short range and low bandwidth communication for small range UAVs  

Microsoft Academic Search

Parameters of the onboard electronics of a small sized (0.5-3m) and light weight (0.5-5kg) UAV is highly limited. Usually there is only a low powered, narrow bandwidth 2.4 GHz radio modem (e.g. XBee or XStream) for the communication. The useful range of these modules is only 1-2 km. Over that distance, the noise of the channel is very high. There

D. Stojcsics; L. Somlyai

2010-01-01

172

Applications of High Technology to Communication Instruction.  

ERIC Educational Resources Information Center

Discusses classroom design and uses of interactive media. Covers the design of public speaking/interpersonal/small group communication classrooms, the simulation laboratory, the communication effectiveness trainer (ComET system), audience response systems, speech evaluation using computers, and system design considerations. (PD)

Behnke, Ralph R.; O'Hair, H. Dan

1984-01-01

173

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

174

Minimization of acquisition time in short-range free-space optical communication.  

PubMed

We consider short-range (1-3-km) free-space optical communication between moving parties when covertness is the overriding system performance requirement. To maximize covertness, it is critical to minimize the time required for the acquisition phase, during which the party initiating contact must conduct a broad-field scan and so risks revealing his position. Assuming an elliptical Gaussian beam profile, we show how to optimize the beam divergence angles, scan speed, and design of the raster scan pattern so as to minimize acquisition time. In this optimization, several constraints are considered, including signal-to-noise ratio, required for accurate bearing detection and reliable decoding; limited receiver bandwidth; limited scanner speed; and beam divergence as limited by the scanner mirror dimensions. The effects of atmospheric turbulence are also discussed. PMID:12510925

Wang, Jin; Kahn, Joseph M; Lau, Kam Y

2002-12-20

175

High-speed SiGe BiCMOS technologies for Ethernet communications  

E-print Network

a bandwidth of 2.94 Mb/s. The current version is standardized as IEEE 802.3. Introduction: Ethernet networkingHigh-speed SiGe BiCMOS technologies for Ethernet communications from 10Gb/s to 100Gb/s Pascal Short Course "100Gb/s Ethernet / High-Speed Data Converters" Monday, October 13, 2008 ­ Monterey, CA

Weinreb, Sander

176

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.

177

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

178

Effects of polarization coupling loss mechanism on design of meteor scatter antennas for short- and long-range communication  

NASA Astrophysics Data System (ADS)

This paper considers the effect of the polarization coupling loss phenomenon on the design of antennas for meteor scatter communication at short and long ranges. It will be demonstrated that this mechanism strongly influences the spatial arrival pattern of usable meteor trils, and that antenna patterns need to be designed around this effect. Characteristics of antenna patterns which exploit the spatial arrival pattern of meteor trails at short and long ranges will be given.

Weitzen, Jay A.

1989-08-01

179

Short communication Effect of electrolyte pH on the rate of the anodic and cathodic reactions in an  

E-print Network

Short communication Effect of electrolyte pH on the rate of the anodic and cathodic reactions generation from an air-cathode microbial fuel cell (MFC) with a mixed bacteria culture at different pH showed resistance [8­13]. The electrolyte pH is crucial to the MFCs power output. Generally, bacteria require a p

180

Short communication articles published in BJOMS during 20082009an analysis of types of submission and subject material  

Microsoft Academic Search

The British Journal of Oral and Maxillofacial Surgery (BJOMS) accepts many types of papers that include leading articles, reviews, full length articles, and short communications. Many of the latter are isolated case reports of rare or interesting pathology, or personal experience of a difficult or unexpected complication. Case reports are considered to have a relatively low value in the advancement

P. A. Brennan; D. A. Mitchell; T. W. Walker; L. Cascarini; R. S. Oeppen

2010-01-01

181

PC Cluster Machine Equipped with High-Speed Communication Software  

E-print Network

A high performance Beowulf (PC cluster) machine installed with Linux operating system and MPI (Message Passing Interface) for interprocessor communications has been constructed using Gigabit Ethernet and the communication software GAMMA (Genoa Active Message Machine), instead of the standard TCP/IP protocol. Fast C/Fortran compilers have been exploited with the GAMMA communication libraries. This method has eliminated large communication overhead of TCP/IP and resulted in significant increase in the computational performance of real application programs including the first-principle molecular dynamics simulation code. (Keywords: non TCP/IP, active messages, small latency, fast C/Fortran compilers, materials science, first-principle molecular dynamics)

Tanaka, M

2004-01-01

182

Interference of Short Optical Pulses from Independent Gain-Switched Laser Diodes for Quantum Secure Communications  

NASA Astrophysics Data System (ADS)

Since the introduction of the decoy-state technique, phase-randomized weak coherent light pulses have been the key to increase the practicality of quantum-based communications. Their ultrafast generation was accomplished via compact gain-switched (GS) lasers, leading to high key rates in quantum key distribution (QKD). Recently, the question arose whether the same laser could be employed to achieve high-speed measurement-device-independent QKD, a scheme that promises long-haul quantum communications immune to all detector attacks. For that, a challenging high-visibility interference between independent picosecond optical pulses is required. Here, we answer the above question in the affirmative by demonstrating high-visibility interference from two independent GS lasers triggered at 1 GHz. The result is obtained through a careful characterization of the laser frequency chirp and time jitter. By relating these quantities to the interference visibility, we obtain a parameter-free verification of the experimental data and a numerical simulation of the achievable key rates. These findings are beneficial to other applications making use of GS lasers, including random number generation and standard QKD.

Yuan, Z. L.; Lucamarini, M.; Dynes, J. F.; Frhlich, B.; Ward, M. B.; Shields, A. J.

2014-12-01

183

Transport System Architectures for High-Performance Communications Subsystems  

E-print Network

Transport System Architectures for High-Performance Communications Subsystems Douglas C. Schmidt as CPU(s), virtual memory, and network adapters) together with communication pro- tocols (such as TCP/IP subsystem, the x-kernel, and the Conduit framework from the Choices oper- atingsystem. This paper

Schmidt, Douglas C.

184

Visual Communications Studies at Roberto Clemente High School.  

ERIC Educational Resources Information Center

Roberto Clemente High School in Chicago has an interdisciplinary communications program involving seven subject areas: Graphic Design, Graphic Arts, Photography, Photocomposition, TV Radio/Film, Communications in Spanish, and Latin American Literature. The instructors in these classes form a team. This article is part of a theme issue on career

Karzen, Michael

1981-01-01

185

Recent advances in high-speed underwater acoustic communications  

Microsoft Academic Search

In recent years, underwater acoustic (UWA) communications have received much attention as their applications have begun to shift from military toward commercial. Digital communications through UWA channels differ substantially from those in other media, such as radio channels, due to severe signal degradations caused by multipath propagation and high temporal and spatial variability of the channel conditions. The design of

Milica Stojanovic

1996-01-01

186

Interference of short optical pulses from independent gain-switched laser diodes for quantum secure communications  

E-print Network

Since the introduction of the decoy-state technique, phase-randomised weak coherent light pulses have been the key to increase the practicality of quantum-based communications. Their ultra-fast generation was accomplished via compact gain-switched (GS) lasers, leading to high key rates in quantum key distribution (QKD). Recently, the question arose of whether the same laser could be employed to achieve high-speed measurement-device-independent-QKD, a scheme that promises long-haul quantum communications immune to all detector attacks. For that, a challenging highvisibility interference between independent picosecond optical pulses is required. Here, we answer the above question in the affirmative by demonstrating high-visibility interference from two independent GS lasers triggered at 1GHz. The result is obtained through a careful characterization of the laser frequency chirp and time jitter. By relating these quantities to the interference visibility, we obtain a parameter-free verification of the experimental data and a numerical simulation of the achievable key rates. These findings are beneficial to other applications making use of GS lasers, including random number generation and standard QKD.

Z. L. Yuan; M. Lucamarini; J. F. Dynes; B. Frohlich; M. B. Ward; A. J. Shields

2015-01-08

187

Methods for UGV teleoperation with high latency communications  

NASA Astrophysics Data System (ADS)

In this project, we developed and demonstrated complementary UGV control methods for teleoperation with highlatency communications. The methods included latency protection, predictive displays, and supervisory control. Latency protection mitigate against typical types of high-latency teleoperation input errors. The Phase I latency protection methods included filtering the joysick commands, limiting the commanded rates as a function of latency, and emergency stop when the operator commands and OCU navigation video were out of phase. Predictive displays indicate to the operator the current state of the UGV, i.e., the state after all of the latent commands are executed (latent commands are those that have been issued but whose effects do not yet appear in the OCU display). We implemented two alternative predictive display methods: augmented reality using iconography to indicate the effects of the latent commands, and virtual reality which warps the image to show the view to reflect the latent commands. Supervisory control allows the operator to specify simple, short-range objectives that the UGV can accomplish on its own, without advanced sensing, path planning, etc. We implemented an effective "point-and-go" supervisory control system. We successfully implemented and demonstrated these methods on a Packbot510 EOD robot (made by iRobot Corporation), currently being used in-theater.

Witus, Gary; Hunt, Shawn; Janicki, Phil

2011-05-01

188

Bandwidth Efficient Turbo Coding For High Speed Mobile Satellite Communications  

Microsoft Academic Search

ABSTRACT This paper describes an application of turbo codes in conjunction with 16QAM in high speed mobile satellite communications The channel characteristics, the architecture of the modem and the performance curves for the selected turbo codes are presented

Mark Rice; Paul Gray; S. Adrian Barbulescu; Wade Farrell

1997-01-01

189

Personal communication system combines high performance with miniaturization  

NASA Technical Reports Server (NTRS)

Personal communication system provides miniaturized components that incorporate high level signal characteristics plus noise rejection in both microphone and earphone circuitry. The microphone is designed to overcome such spacecraft flight problems as size, ambient noise level, and RF interference.

Atlas, N. D.

1967-01-01

190

NHSE - National High Performance Computing and Communications (HPCC) Software Exchange  

NSDL National Science Digital Library

National Software Exchange for the High Performance Computing and Communications community has been established to facilitate the development and distribution of software enabling technologies for high performance computing a wide availability of high-quality, public-domain software for high performance computers. The exchange promotes software reuse and collaboration and information sharing between universities, research laboratories, and industry.

1997-01-01

191

The High Stakes of Risk Communication  

Microsoft Academic Search

Background.Risk communication involves coping with lack of public knowledge of science, scientific complexity and uncertainty, disagreement among experts on risk characterization and comparison, assumptions in risk assessment, the role of advocates, distortion in the mass media, manipulative public relations, and public outrage.Methods.This article summarizes two case studies, one of an emerging issue, the use of oxygenates in gasoline, and the

Ford Rowan

1996-01-01

192

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

193

Ultra short pulse generation and reshaping using highly nonlinear fibers  

NASA Astrophysics Data System (ADS)

We experimentally investigate the generation of a low-noise ultra short pulse train from 40GHz to160GHz by using Comb-like profiled fiber (CPF) for adiabatic soliton conversion and compression. Highly nonlinear fibers allow us to reduce total length of CPF as well as to utilize Kerr effect in the fiber effectively. We demonstrate generations of 160GHz soliton train of 750fs, the compression to 500fs of 40GHz externally-modulated pulse with wideband tunability over 30nm. Then we apply the CPF pulse compression technique to achieve the programmable repetition tunability from 5 to 500 MHz in low pedestral 300fs pulse train generation.

Matsushita, S.; Namiki, S.; Inoue, T.; Oguri, A.; Akutsu, T.; Shinozaki, J.; Ozeki, Y.; Takasaka, S.; Igarashi, K.; Sakano, M.; Yagi, T.

2005-11-01

194

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

195

NASA High Performance Computing and Communications program  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration's HPCC program is part of a new Presidential initiative aimed at producing a 1000-fold increase in supercomputing speed and a 1(X)-fold improvement in available communications capability by 1997. As more advanced technologies are developed under the HPCC program, they will be used to solve NASA's 'Grand Challenge' problems, which include improving the design and simulation of advanced aerospace vehicles, allowing people at remote locations to communicate more effectively and share information, increasing scientists' abilities to model the Earth's climate and forecast global environmental trends, and improving the development of advanced spacecraft. NASA's HPCC program is organized into three projects which are unique to the agency's mission: the Computational Aerosciences (CAS) project, the Earth and Space Sciences (ESS) project, and the Remote Exploration and Experimentation (REE) project. An additional project, the Basic Research and Human Resources (BRHR) project, exists to promote long term research in computer science and engineering and to increase the pool of trained personnel in a variety of scientific disciplines. This document presents an overview of the objectives and organization of these projects, as well as summaries of early accomplishments and the significance, status, and plans for individual research and development programs within each project. Areas of emphasis include benchmarking, testbeds, software and simulation methods.

Holcomb, Lee; Smith, Paul; Hunter, Paul

1994-01-01

196

NASA high performance computing and communications program  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration's HPCC program is part of a new Presidential initiative aimed at producing a 1000-fold increase in supercomputing speed and a 100-fold improvement in available communications capability by 1997. As more advanced technologies are developed under the HPCC program, they will be used to solve NASA's 'Grand Challenge' problems, which include improving the design and simulation of advanced aerospace vehicles, allowing people at remote locations to communicate more effectively and share information, increasing scientist's abilities to model the Earth's climate and forecast global environmental trends, and improving the development of advanced spacecraft. NASA's HPCC program is organized into three projects which are unique to the agency's mission: the Computational Aerosciences (CAS) project, the Earth and Space Sciences (ESS) project, and the Remote Exploration and Experimentation (REE) project. An additional project, the Basic Research and Human Resources (BRHR) project exists to promote long term research in computer science and engineering and to increase the pool of trained personnel in a variety of scientific disciplines. This document presents an overview of the objectives and organization of these projects as well as summaries of individual research and development programs within each project.

Holcomb, Lee; Smith, Paul; Hunter, Paul

1993-01-01

197

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

198

Promoting High-Performance Computing and Communications. A CBO Study.  

ERIC Educational Resources Information Center

In 1991 the Federal Government initiated the multiagency High Performance Computing and Communications program (HPCC) to further the development of U.S. supercomputer technology and high-speed computer network technology. This overview by the Congressional Budget Office (CBO) concentrates on obstacles that might prevent the growth of the

Webre, Philip

199

Patterns of communication in high-fidelity simulation.  

PubMed

High-fidelity simulation is commonplace in nursing education. However, critical thinking, decision making, and psychomotor skills scenarios are emphasized. Scenarios involving communication occur in interprofessional or intraprofessional settings. The importance of effective nurse-patient communication is reflected in statements from the American Nurses Association and Quality and Safety Education for Nurses, and in the graduate outcomes of most nursing programs. This qualitative study examined the patterns of communication observed in video recordings of a medical-surgical scenario with 71 senior students in a baccalaureate program. Thematic analysis revealed patterns of (a) focusing on tasks, (b) communicating-in-action, and (c) being therapeutic. Additional categories under the patterns included missing opportunities, viewing the "small picture," relying on informing, speaking in "medical tongues," offering choicesokay?, feeling uncomfortable, and using therapeutic techniques. The findings suggest the importance of using high-fidelity simulation to develop expertise in communication. In addition, the findings reinforce the recommendation to prioritize communication aspects of scenarios and debriefing for all simulations. [J Nurs Educ. 2015;54(1):22-27.]. PMID:25545143

Anderson, Judy K; Nelson, Kimberly

2015-01-01

200

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

201

Short-pulse high intensity laser thin foil interaction  

NASA Astrophysics Data System (ADS)

The technology of ultrashort pulse laser generation has progressed to the point that optical pulses larger than 10 J, 300 fs duration or shorter are routinely produced. Such pulses can be focused to intensities exceeding 10^18 W/cm^2. With high contrast pulses, these focused intensities can be used to heat solid matter to high temperatures with minimal hydrodynamic expansion, producing an extremely high energy-density state of matter for a short period of time. This high density, high temperature plasma can be studied by x-ray spectroscopy. We have performed experiments on thin foils of different elements under well controlled conditions at the 100 Terawatt laser at LULI to study the characteristics X-ray emission of laser heated solids. To suppress the ASE effect, the laser was frequency doubled. S-polarized light with a peak intensity of 10^19W/cm^2 was used to minimize resonance absorption. To decrease the effect of longitudinal temperature gradients very thin (800 ?) aluminum foil targets were used. We have also studied the effect of radial gradient by limiting the measured x-ray emission zone using 50? or 100? pinhole on target. The spectra, in the range 7-8, were recorded using a conical crystal spectrometer coupled to a 800 fs resolution streak camera. A Fourier Domain Interferometry (FDI) of the back of the foil was also performed providing a measurement of the hydrodynamic expansion as function of time for each shot. To simulate the experiment, we used the 1D hydrodynamic code FILM with a given set of plasma parameter (?, Te) as initial conditions. The X-ray emission was calculated by post processing hydrodynamic results with a collisional-radiative model which uses super-configuration average atomic data. The simulation reproduces the main features of the experimental time resolved spectrum.

Audebert, Patrick

2003-10-01

202

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

203

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

204

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

205

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

206

Short-Range Wireless Communications for Next-Generation Networks: UWB, 60 GHz Millimeter-Wave WPAN, And ZigBee  

Microsoft Academic Search

This article presents standardization, regulation, and development issues associated with short-range wireless technologies for next-generation personal area networks (PAN). Ultra-wideband (UWB) and 60 GHz millimeter-wave communication technologies promise unprecedented short-range broadband wireless communication and are the harbingers of multigigabit wireless networks. Despite the huge potential for PAN, standardization and global spectrum regulations challenge the success of UWB. On the other

Theordore Rappaport

2007-01-01

207

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

Microsoft Academic Search

In this paper, we have presented the simulation results of a rectangular microstrip patch antenna at terahertz (THz) frequency\\u000a ranging from 0.7 to 0.85THz. THz electromagnetic wave can permit more densely packed communication links with increased security\\u000a of communication transmission. The simulated results such as gain, radiation efficiency and 10dB impedance bandwidth of rectangular\\u000a microstrip patch antenna at THz frequencies

Aditi Sharma; G. Singh

2009-01-01

208

Commercial optical inter-satellite communication at high data rates  

NASA Astrophysics Data System (ADS)

Laser communication terminals with data rates far above 1 Gbps have been in operation in orbit since January 2008, and the links established between two low Earth orbit (LEO) satellites have demonstrated error-free communication. Bit error rates better than 10-11 have been achieved without data encoding. Signal acquisition can be reproducibly achieved within a few seconds. After adaptation to larger link separation distances these laser communication terminals will be used in the low earth orbit-geosynchronous satellite (LEO-GEO) link of European data relay satellite (EDRS), the GEO European data relay system. LEO-to-ground and ground-to-LEO links have examined the impact of the atmosphere on such optical links. In the future, high data rate GEO-to-ground links will require ground stations equipped with adaptive optics, which are currently under development.

Gregory, Mark; Heine, Frank; Kmpfner, Hartmut; Lange, Robert; Lutzer, Michael; Meyer, Rolf

2012-03-01

209

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

210

Short-rib-polydactyly syndrome presenting with increased nuchal translucency in a high-risk family.  

PubMed

Short-rib-polydactyly syndrome represents a group of rare, autosomal recessive, lethal skeletal dysplasias characterized by hypoplastic thorax, short ribs, short limbs, polydactyly, and visceral abnormalities. We describe an affected fetus from a high-risk family presenting with increased nuchal translucency at 13 weeks of pregnancy. The diagnosis was established in the 2nd trimester. PMID:16912486

Daskalakis, G; Souka, A P; Kavalakis, I; Haritos, T; Basayiannis, C; Antsaklis, P; Antsaklis, A

2006-01-01

211

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

212

All-reflective, highly accurate polarization rotator for high-power short-pulse laser systems.  

PubMed

We present the setup of a polarization rotating device and its adaption for high-power short-pulse laser systems. Compared to conventional halfwave plates, the all-reflective principle using three zero-phase shift mirrors provides a higher accuracy and a higher damage threshold. Since plan-parallel plates, e.g. these halfwave plates, generate postpulses, which could lead to the generation of prepulses during the subsequent laser chain, the presented device avoids parasitic pulses and is therefore the preferable alternative for high-contrast applications. Moreover the device is easily scalable for large beam diameters and its spectral reflectivity can be adjusted by an appropriate mirror coating to be well suited for ultra-short laser pulses. PMID:23037123

Keppler, S; Hornung, M; Bdefeld, R; Kahle, M; Hein, J; Kaluza, M C

2012-08-27

213

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

214

A high resolution analog fiber optics data communications system  

Microsoft Academic Search

A high resolution fiber optics communications system (FOCS) for analog signals has been designed, built, and tested. The system consists of a small transmitter and receiver pair and an optical wave guide. A combination of voltage-to-frequency-to-voltage and pulse width modulation is used to reconstruct a plus or minus 10 volt analog output signal from an identical plus or minus 10

G. J. Grimes; D. R. Stevens

1976-01-01

215

High-speed satellite mobile communications: technologies and challenges  

Microsoft Academic Search

Central features of future 4G mobile communication systems are high-speed data transmission (up to 1 Gb\\/s) and interactive multimedia services. For effective delivery of these services, the network must satisfy some stringent QoS metrics, defined typically in terms of maximum delay and\\/or minimum throughput. Mobile satellite systems will be fully integrated with the terrestrial cellular systems to provide ubiquitous global

MOHAMED IBNKAHLA; QUAZI MEHBUBAR RAHMAN; AHMED IYANDA SULYMAN; HISHAM ABDULHUSSEIN AL-ASADY; Jun Yuan; AHMED SAFWAT

2004-01-01

216

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

217

Iridium Short Burst Data: Two-Way, Robust, Reliable, Low Power Communications for Oceanographic Data Transmission Applications  

NASA Astrophysics Data System (ADS)

Over the past two hundred years, water level observations in coastal areas have been used to help mariners navigate oceans and estuaries, cartographers develop nautical charts, government agencies regulate boundaries, and scientists gain a better understanding of various physical processes in the ocean. As technology has progressed the latency in providing these data to the user has been reduced. The National Oceanic and Atmospheric Administration's (NOAA) Center for Operational Oceanographic Products and Services (CO-OPS) provides near real-time oceanographic and meteorological data to support navigation, coastal managers, and storm surge and tsunami warning programs. CO-OPS maintains the National Water Level Observation Network (NWLON), a system of over 200 stations for the coastal United States, Great Lakes, Caribbean islands, and Pacific island territories. CO-OPS also supports the NOAA Physical Oceanographic Real Time Systems (PORTS), which are currently operating in 21 US ports. With an expanding role in Arctic and Alaska support, CO-OPS has identified a need for a robust and reliable data communications pathway to supplement the existing Geostationary Operational Environmental Systems (GOES) network, which has limitations at high latitudes. Iridium satellite Short Burst Data (SBD) services offer a global coverage, including remote Arctic regions outside of GOES coverage. Previous testing conducted by CO-OPS has shown a great potential for the SBD service including continuous near-real-time 6 minute data transmissions from two CO-OPS test water level stations located in Guam, with >99.9% data return. Also, successful transmissions of hourly wave statistics were demonstrated with a with a test system that employed a Nortek Acoustic Wave and Current (AWAC) instrument in Chesapeake Bay were accomplished. Data transmissions involved a buoy-mounted SIM-less SBD modem. Independent of location, data can be transmitted from a remote instrument platform to Iridium satellites with a latency of just 15 seconds. Successful test demonstrations have led to discussions regarding prospective work to integrate these small modems into CO-OPS current meters that are mounted on United States Coast Guard (USCG) Aid to Navigation (ATON) buoys, improving the reliability of the real-time transmission pathway between data collection and data reporting via PORTS . Overall, this work has shown that with careful evaluation of data needs, commercial Iridium service can be economically used to accomplish telemetry requirements. It also shows potential for event-driven high frequency data transmission options, for applications such as marine warning systems. CO-OPS efforts to test and evaluate Iridium communications oceanographic observatories reported on here has been a collaborative endeavor with the United States Army Corp Engineers (USACE) Field Research Facility (FRF) in Duck, NC, the USACE Cold Regions Research Engineering Laboratory (CRREL) in Hanover, NH, NAL Research Inc, Sutron Corporation,and Nortek USA.

Roggenstein, E. B.; Hensley, W.

2011-12-01

218

Multiply-agile encryption in high speed communication networks  

SciTech Connect

Different applications have different security requirements for data privacy, data integrity, and authentication. Encryption is one technique that addresses these requirements. Encryption hardware, designed for use in high-speed communications networks, can satisfy a wide variety of security requirements if that hardware is key-agile, robustness-agile and algorithm-agile. Hence, multiply-agile encryption provides enhanced solutions to the secrecy, interoperability and quality of service issues in high-speed networks. This paper defines these three types of agile encryption. Next, implementation issues are discussed. While single-algorithm, key-agile encryptors exist, robustness-agile and algorithm-agile encryptors are still research topics.

Pierson, L.G. [Sandia National Labs., Albuquerque, NM (United States); Witzke, E.L. [RE/SPEC Inc., Albuquerque, NM (United States)

1997-05-01

219

High-speed laser communications in UAV scenarios  

NASA Astrophysics Data System (ADS)

Optical links, based on coherent homodyne detection and BPSK modulation with bidirectional data transmission of 5.6 Gbps over distances of about 5,000 km and BER of 10-8, have been sufficiently verified in space. The verification results show that this technology is suitable not only for space applications but also for applications in the troposphere. After a brief description of the Laser Communication Terminal (LCT) for space applications, the paper consequently discusses the future utilization of satellite-based optical data links for Beyond Line of Sight (BLOS) operations of High Altitude Long Endurance (HALE) Unmanned Aerial Vehicles (UAV). It is shown that the use of optical frequencies is the only logical consequence of an ever-increasing demand for bandwidth. In terms of Network Centric Warfare it is highly recommended that Unmanned Aircraft Systems (UAS) of the future should incorporate that technology which allows almost unlimited bandwidth. The advantages of optical communications especially for Intelligence, Surveillance and Reconnaissance (ISR) are underlined. Moreover, the preliminary design concept of an airborne laser communication terminal is described. Since optical bi-directional links have been tested between a LCT in space and a TESAT Optical Ground Station (OGS), preliminary analysis on tracking and BER performance and the impact of atmospheric disturbances on coherent links will be presented.

Griethe, Wolfgang; Gregory, Mark; Heine, Frank; Kmpfner, Hartmut

2011-05-01

220

X-rays from high-intensity, short-pulse laser interaction with solids  

NASA Astrophysics Data System (ADS)

Laser pulses with high intensity (up to 1018 W/cm2) and short duration (100 fs) were focused on solids. The result was highly ionized material and hot electrons, along with the emission of short pulse x-rays and unicycle electromagnetic pulses with subpicosecond duration.

Falcone, R. W.; Gordon, S. P.; Hamster, H.; Sullivan, A.

1993-10-01

221

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

222

Java-based communication in a High Performance Computing environment  

NASA Astrophysics Data System (ADS)

Java is one of the most widely used computer programming languages, however its use in High Performance Computing (HPC) is relatively low. A typical HPC environment consists of a number of multi-core computing nodes, while a typical application running in such an environment will normally contain CPU intensive code that can be executed in parallel. Such an application may require inter-node as well as intra-node communication. Message Passing Interface (MPI) is a language independent specification of an API to allow such communication. MPJExpress (Baker et al. 2006) and F-MPJ (Taboada et al. 2009) are Java-based implementations of MPI, designed with the efficient performance of data transfers as a main objective. In this paper we discuss the scalability of one approach of distributing data to compute nodes in HPC and we propose the design of an alternative data transfer system, building upon MPI.

Fries, A.; de Mora, J. Portell I.; Sirvent, R.

2011-02-01

223

Java Fast Sockets: Enabling high-speed Java communications on high performance clusters  

E-print Network

Java Fast Sockets: Enabling high-speed Java communications on high performance clusters Guillermo L Keywords: Java sockets High performance cluster Scalable coherent interface Myrinet Gigabit Ethernet a b s t r a c t This paper presents Java Fast Sockets (JFS), an optimized Java socket implementation

Touriño, Juan

224

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

225

Demonstration of high-rate laser communications from fast airborne platform: flight campaign and results  

NASA Astrophysics Data System (ADS)

Some current and future airborne payloads like high resolution cameras and radar systems need high channel capacity to transmit their data from air to ground in near real-time. Especially in reconnaissance and surveillance missions, it is important to downlink huge amount of data in very short contact times to a ground station during a flyby. Aeronautical laser communications can supply the necessary high data-rates for this purpose. Within the project DODfast (Demonstration of Optical Data link fast) a laser link from a fast flying platform was demonstrated. The flight platform was a Panavia Tornado with the laser communication terminal installed in an attached avionic demonstrator pod. The air interface was a small glass dome protecting the beam steering assembly. All other elements were integrated in a small box inside the Pod's fuselage. The receiver station was DLR's Transportable Optical Ground Station equipped with a free-space receiver front-end. Downlink wavelength for communication and uplink wavelength for beacon laser were chosen from the optical C-band DWDM grid. The test flights were carried out at the end of November 2013 near the Airbus Defence and Space location in Manching, Germany. The campaign successfully demonstrated the maturity and readiness of laser communication with a data-rate of 1.25 Gbit/s for aircraft downlinks. Pointing, acquisition and tracking performance of the airborne terminal and the ground station could be measured at aircraft speed up to 0.7 Mach and video data from an onboard camera has been transmitted. Link distances with stable tracking were up to 79 km and distance with data transmission over 50 km. In this paper, we describe the system architecture, the flight campaign and the results.

Moll, Florian; Mitzkus, Wolfgang; Horwath, Joachim; Shrestha, Amita; Brechtelsbauer, Martin; Martin, Luis; Lozano, Alberto; Diaz Gonzalez, Dionisio

2014-10-01

226

Communication: An exact short-time solver for the time-dependent Schrdinger equation  

PubMed Central

The short-time integrator for propagating the time-dependent Schrdinger equation, which is exact to machines round off accuracy when the Hamiltonian of the system is time-independent, was applied to solve dynamics processes. This integrator has the old Cayleys form [i.e., the Pad (1,1) approximation], but is implemented in a spectrally transformed Hamiltonian which was first introduced by Chen and Guo. Two examples are presented for illustration, including calculations of the collision energy-dependent probability passing over a barrier, and interaction process between pulse laser and the I2 diatomic molecule. PMID:21280676

Sun, Zhigang; Yang, Weitao

2011-01-01

227

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

Microsoft Academic Search

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

James Benet

1994-01-01

228

Characterizing the multipath and Doppler spreads of the high-latitude meteor burst communication channel  

NASA Astrophysics Data System (ADS)

High-latitude propagation phenomena, such as scatter from the aurora and sporadic-E propagation, can alter the communication characteristics of the meteor communication channel. This paper describes an experiment in which the fading and multipath profiles of the high-latitude meteor communication channel were characterized. The effects of high-latitude propagation phenomena on the capacity and reliability of meteor burst communication are discussed.

Weitzen, Jay A.; Sowa, Michael J.; Scofidio, Rob A.; Quinn, John

1987-10-01

229

High speed short wave infrared (SWIR) imaging and range gating cameras  

NASA Astrophysics Data System (ADS)

Imaging in the Short Wave Infrared (SWIR) provides unique surveillance capabilities, both with passive illumination from the night glow in the atmosphere or with active illumination from covert LED or eye-safe lasers. Spectral effects specific to the 0.9 to 1.7 um wavelength range reveal camouflage and chemical signatures of ordinance. The longer wavelength range also improves image resolution over visible cameras in foggy or dusty environments. Increased military interest in cameras that image all laser range finders and target designators on the battlefield has driven development of a new class of uncooled InGaAs cameras with higher resolution and larger field of view than previously available. Current and upcoming needs include: imaging in all lighting conditions, from direct sunlight to partial starlight while using minimal power; range gating the camera to image through obscurants or beyond unimportant objects; and high speed capture of muzzle flare, projectile tracking, guide star and communications laser-beam tracking and wavefront correction. This paper will present images from new COTS cameras now available to address these needs and discuss the technology roadmap for further improvements.

Malchow, Douglas; Battaglia, Jesse; Brubaker, Robert; Ettenberg, Martin

2007-04-01

230

Preliminary investigation of acoustic bar codes for short-range underwater communications  

NASA Astrophysics Data System (ADS)

In March 2005, underwater acoustic communications experiments were carried out from the DRDC Atlantic research vessel CFAV QUEST. A battery-operated BATS20 transmitter and a broadband barrel-stave flextensional transducer were used to broadcast noise containing acoustic bar code (ABC) information. The ABCs are silent frequency bands of fixed duration that resemble retail bar codes when viewed in a spectrogram. Two sites were selected for the experiments. The first was a shallow-water area west of the Berry Islands in the Bahamas, and the second was a deep-water site south of the Western Bank on the Scotian Shelf. Two receiver systems were deployed; autonomous, variable-buoyancy Stealth Buoys resting on the bottom at the shallow site, and drifting AN/SSQ-53F sonobuoys fitted with GPS at the deep site. Results from these experiments will be presented and future work will be discussed.

Jones, Dennis F.

2005-09-01

231

High performance germanium-on-silicon detectors for optical communications  

NASA Astrophysics Data System (ADS)

We demonstrate fast and efficient germanium-on-silicon p-i-n photodetectors for optical communications, with responsivities as high as 0.89 and 0.75 A/W at 1.3 and 1.55 mum, respectively, time response <200 ps and dark currents as low as 1.2 muA. Ge was epitaxially grown on Si by chemical vapor deposition, employing a low temperature buffer and cyclic thermal annealing to reduce the dislocation density. The overall performance is well suited for >2.5 Gb/s integrated receivers for the second and third fiber spectral windows.

Fama, Silvia; Colace, Lorenzo; Masini, Gianlorenzo; Assanto, Gaetano; Luan, Hsin-Chiao

2002-07-01

232

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

233

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

234

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.

235

SHORT COMMUNICATION: Comments on recent proposals for redefining the mole and kilogram  

NASA Astrophysics Data System (ADS)

The fundamental concept of the mole requires the number of entities comprising one mole, i.e. Avogadro's number, to be exactly equal to the gram-to-dalton mass ratio. If this compatibility condition is to be satisfied, the mole, the kilogram and the dalton cannot all be defined independently. This note concerns recent Metrologia publications that do, however, propose independent definitions of all three quantities: the mole by fixing the value of Avogadro's number and the kilogram by fixing the value of the Planck constant, while retaining the current carbon-12-based dalton. Adoption of these incompatible definitions would likely cause serious widespread confusion and might even result in a split in scholarly and technical communication between the quantum physics and chemistry communities. Other entirely compatible alternatives are possible: either retaining the current (inexact) carbon-12-based mole and dalton with an independently redefined kilogram or redefining the mole by fixing the value of Avogadro's number, with a compatible dalton that is exact in terms of the redefined kilogram.

Leonard, B. P.

2010-06-01

236

Short pulse and high repetition rate diode-pumped Yb:CaF2 regenerative amplifier  

E-print Network

short pulses for various repetition rates ranging from 100 Hz to 10 kHz. The shortest pulse duration of high energy and ultra-short laser pulses. Many research efforts have been devoted to the generation (80 W) [2] combined with energetic laser pulses (25 µJ with Yb:YAG in thin disk structures) have been

Boyer, Edmond

237

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

238

High performance computing and communications: FY 1995 implementation plan  

SciTech Connect

The High Performance Computing and Communications (HPCC) Program was formally established following passage of the High Performance Computing Act of 1991 signed on December 9, 1991. Ten federal agencies in collaboration with scientists and managers from US industry, universities, and laboratories have developed the HPCC 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 1994 and FY 1995. 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. Although the Department of Education is an official HPCC agency, its current funding and reporting of crosscut activities goes through the Committee on Education and Health Resources, not the HPCC Program. For this reason the Implementation Plan covers nine HPCC agencies.

NONE

1994-04-01

239

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

240

Thermal testing of a high powered communications satellite  

NASA Technical Reports Server (NTRS)

Thermal Vacuum and Thermal Balance tests were successfully conducted on the high power Communications Technology Satellite (CTS). The mission required testing for two distinct thermal environments; spin stabilized at 60 rpm with a minimum of 55 watts of dissipated power, and three-axis stabilized with as much as a tenfold increase of dissipation. The test program verified the adequacy of the spacecraft thermal design and demonstrated functional operation over a wide temperature range for all of the components. Special test hardware incorporating water-cooling systems was required to accomodate the heatpipes and high RF output power. Objectives, test facilities, special hardware, spacecraft configurations, and results of the tests are discussed. Preliminary flight results and conclusions drawn from the test experience are reported.

Caswell, R. D.; Edelman, E. A.

1976-01-01

241

Short communication What controls the concentration of various aliphatic lipids in soil?  

E-print Network

the chemical and biological compositions of soils were highly variable for plantations of different tree reflect an effect of soil biota, such as preferential consumption of leaf litter by anecic earthworms

Minnesota, University of

242

Short communication: Factors affecting hair cortisol concentrations in lactating dairy cows.  

PubMed

Cortisol has long been used as a marker of the stress response in animals. Cortisol can be analyzed from different media, most notably from the blood, saliva, and feces; however, the collection of cortisol from some of these media requires invasive procedures or excessive handling of the animals. Furthermore, it is not possible to capture long-term increases in circulating concentrations of cortisol from the blood, saliva, or feces. Hair cortisol has been found to be a reliable alternative for measuring chronic stress. With this emerging measure, appropriate sampling methodology must be developed and validated. The aim of this study was to determine the effects of hair color, sampling location, and processing method on cortisol concentrations in hair from lactating black and white Holstein cows (n=18). Furthermore, we aimed to measure the hair growth rates at different body locations (n=12) and test hair cortisol levels when resampled over short intervals (n=37). Both black- and white-colored hair was collected from the shoulder, top line, hip, and tail switch of Holsteins; due to breed characteristics only white hair was harvested from the tail switch. All samples were cleaned with water and isopropanol, and then ground in a ball mill or finely cut with scissors once dry. Cortisol was extracted with methanol before being measured using a commercially available ELISA kit. Concentrations of cortisol were greater in white than in black hair (7.8 1.1 vs. 3.8 1.1 pg/mg). When only white samples were analyzed, hair from the tail switch had more cortisol than hair from the shoulder (11.0 1.2 vs. 6.2 1.2 pg/mg), whereas no difference was found when compared with the hip and top line. Samples ground with a ball mill had greater concentrations of cortisol extracted than those minced with scissors (10.4 1.2 vs. 4.7 1.2 pg/mg). The growth rate of hair was significantly greater at the tail switch compared with the hip and shoulder (0.51 0.05 vs. 0.04 0.05 vs. 0.03 0.05 mm/d). When hair was collected every 3 wk after calving, a tendency was detected for multiparous cows to have greater concentrations of hair cortisol and significantly greater concentrations of cortisol on d 0 and 21 after calving compared with d 42, 84, and 126. In Holsteins, the hair on the tail switch is always white, grows more rapidly than other sites, and is sensitive enough to capture changes in cortisol over intervals as short as 3 wk, making it the ideal location for measuring hair cortisol. PMID:25282411

Burnett, Tracy A; Madureira, Augusto M L; Silper, Bruna F; Nadalin, Audrey; Tahmasbi, Abdolmansour; Veira, Douglas M; Cerri, Ronaldo L A

2014-12-01

243

Functional connectivity classification of autism identifies highly predictive brain features but falls short of biomarker standards  

PubMed Central

Objectives Autism spectrum disorders (ASD) are diagnosed based on early-manifesting clinical symptoms, including markedly impaired social communication. We assessed the viability of resting-state functional MRI (rs-fMRI) connectivity measures as diagnostic biomarkers for ASD and investigated which connectivity features are predictive of a diagnosis. Methods Rs-fMRI scans from 59 high functioning males with ASD and 59 age- and IQ-matched typically developing (TD) males were used to build a series of machine learning classifiers. Classification features were obtained using 3 sets of brain regions. Another set of classifiers was built from participants' scores on behavioral metrics. An additional age and IQ-matched cohort of 178 individuals (89 ASD; 89 TD) from the Autism Brain Imaging Data Exchange (ABIDE) open-access dataset (http://fcon_1000.projects.nitrc.org/indi/abide/) were included for replication. Results High classification accuracy was achieved through several rs-fMRI methods (peak accuracy 76.67%). However, classification via behavioral measures consistently surpassed rs-fMRI classifiers (peak accuracy 95.19%). The class probability estimates, P(ASD|fMRI data), from brain-based classifiers significantly correlated with scores on a measure of social functioning, the Social Responsiveness Scale (SRS), as did the most informative features from 2 of the 3 sets of brain-based features. The most informative connections predominantly originated from regions strongly associated with social functioning. Conclusions While individuals can be classified as having ASD with statistically significant accuracy from their rs-fMRI scans alone, this method falls short of biomarker standards. Classification methods provided further evidence that ASD functional connectivity is characterized by dysfunction of large-scale functional networks, particularly those involved in social information processing.

Plitt, Mark; Barnes, Kelly Anne; Martin, Alex

2014-01-01

244

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

245

SIMULATION OF ORIENTATION IN INJECTION MOLDING OF A HIGHLY CONCENTRATED, SHORT GLASS FIBER THERMOPLASTIC COMPOSITES  

E-print Network

SIMULATION OF ORIENTATION IN INJECTION MOLDING OF A HIGHLY CONCENTRATED, SHORT GLASS FIBER approximation for predicting the flow-induced orientation of injection molded composite parts within of the fiber orientation. Introduction Fiber reinforced thermoplastic made by injection molding

Wapperom, Peter

246

A SHORT DESCRIPTION OF THE PLAN OF NOVA HIGH SCHOOL.  

ERIC Educational Resources Information Center

THE NOVA HIGH SCHOOL IS AN EDUCATIONAL EXPERIMENT TO MAKE LEARNING AND ACHIEVEMENT INTERESTING, CHALLENGING, AND EXCITING TO THE STUDENT. THE PROGRAM IS BASED ON THE CONCEPT OF INDIVIDUAL PROGRESS WITH EMPHASIS ON QUALITY EDUCATION. FEATURES OF THE SCHOOL ENVIRONMENT INCLUDE AIR-CONDITIONING, CARPETING, MULTIPURPOSE CLASSROOMS, INDIVIDUAL STUDY

HIERS, NAN

247

SHORT REPORT Open Access Immunological response to highly active  

E-print Network

is currently limited on the long-term follow up of HIV-1 infected women who are on highly active antiretroviral-month immunological response to HAART in HIV-1 infected women in Côte d'Ivoire. The women were tested at four weeks postpartum. In addition, at 36 months, 23% of women were lost to follow up, dead

Paris-Sud XI, Université de

248

Evaluation of components, subsystems, and networks for high rate, high frequency space communications  

NASA Technical Reports Server (NTRS)

The development of new space communications technologies by NASA has included both commercial applications and space science requirements. NASA's Systems Integration, Test and Evaluation (SITE) Space Communication System Simulator is a hardware based laboratory simulator for evaluating space communications technologies at the component, subsystem, system, and network level, geared toward high frequency, high data rate systems. The SITE facility is well-suited for evaluation of the new technologies required for the Space Exploration Initiative (SEI) and advanced commercial systems. Described here are the technology developments and evaluation requirements for current and planned commercial and space science programs. Also examined are the capabilities of SITE, the past, present and planned future configurations of the SITE facility, and applications of SITE to evaluation of SEI technology.

Kerczewski, Robert J.; Ivancic, William D.; Zuzek, John E.

1991-01-01

249

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

E-print Network

of Notocheirus and Iso is a result of adaptive convergent evolution to the high-energy surf habitat where of predominantly surface dwelling fishes that occur throughout tropical and temperate regions. The eight families fishes in near-shore marine, estuarine, and freshwater habitats. Atherini- form relationships have been

Piller, Kyle R.

250

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.

251

J. Phys. II Yance 7 (1997) 967-972 JULY 1997, PAGE 967 Short Communication  

E-print Network

for an immiscible displacement (finite Ca), where surface tension acts to quench the interface in the gap, within instability PACS.47.ll.+j Computational methods in fluid dynamics Abstract. We study the displacement.56 at large AI. Assuming that a miscible displacement at high Peclet numbers is equivalent to an immiscible

Paris-Sud XI, Université de

252

Short Communication Non-invasive measurement of thyroid hormone in feces of a diverse array  

E-print Network

coupled with High Pressure Liquid Chromatography (HPLC) analysis, showed that peak excretion in feces3 profile across these same HPLC fractions closely corresponded with the I131 radioactive profile measures thus helps characterize the role of reduced food availability in disturbance biology, enabling

Wasser, Samuel

253

Short Communication Non-invasive measurement of thyroid hormone in feces of a diverse array  

E-print Network

dogs coupled with High Pressure Liquid Chromatography (HPLC) analysis, showed that peak excretion. The immunoreactive T3 profile across these same HPLC fractions closely corresponded with the I131 radioactive profile measures thus helps characterize the role of reduced food availability in disturbance biology, enabling

254

Short Communication Formation kinetics of a weak ferromagnetic domain from an AFM  

E-print Network

ferromagnétique dans l'orthoferrite de dysprosium Abstract. 2014 In this work high-speed photography state to a weak ferromagnetic one in dysprosium orthoferrite. J. Phys. France 50 (1989) 1153-1156 15 MAI-induced phase transition from an AFM state to a WFM one in dysprosium orthoferrite. The studies were carried out

Boyer, Edmond

255

Short Communication: Variance estimates among herds stratified by individual herd heritability  

Technology Transfer Automated Retrieval System (TEKTRAN)

The objective of this study was to compare genetic parameter estimates among herds stratified by high, medium and low individual herd heritability estimates. A regression model was applied to milk yield, fat yield, protein yield and somatic cell score (SCS) records from 20,902 herds to generate indi...

256

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 YUKARI are reported for the first time in the low pH high temperature springs of Waiotapu, North Island, New Zealand Microbiological activity in North Island, New Zealand was first investigated by Kaplan (1956) in a survey

Kelley, Scott

257

Short Communication Algal cell disruption using microbubbles to localize ultrasonic energy  

E-print Network

: energy requirements for such a process were estimated to be one-fourth of the available heat 107 J/kg of dry biomass for hydrodynamic cavitation up to 5:3 ? 108 J/kg for high-pressure homogenizers (HPH) (Lee et al., 2012). Unfortunately, the heat of combustion of algal biomass is only 2:7 ? 107

Freund, Jonathan B.

258

Demonstration of pMOSFETs With Channels, High , and Controlled Short Channel Effects (SCEs)  

Microsoft Academic Search

High-performance sub-60 nm Si\\/SiGe (Ge:~75%)\\/Si heterostructure quantum well pMOSFETs with a conventional MOSFET process flow, including gate-first high-kappa\\/metal gate stacks with ~1 nm equivalent oxide thickness, are demonstrated. For the first time, short gate length (L g) devices demonstrate not only controlled short channel effects, but also an excellent on-off current (I on\\/I off) ratio (~5times104 55-nm L g). The

Se-Hoon Lee; Prashant Majhi; Jungwoo Oh; Barry Sassman; Chadwin Young; Anupama Bowonder; Wei-Yip Loh; Kyu-Jin Choi; Byung-Jin Cho; Hi-Deok Lee; Paul Kirsch; Harlan R. Harris; Wilman Tsai; Suman Datta; Hsing-Huang Tseng; Sanjay K. Banerjee; Raj Jammy

2008-01-01

259

NEW MADELEINE: a Fast Communication Scheduling Engine for High Performance Networks  

Microsoft Academic Search

Communication libraries have dramatically made progress over the fteen years, pushed by the success of cluster architectures as the preferred platform for high per- formance distributed computing. However, many potential optimizations are left unexplored in the process of mapping application communication requests onto low level network commands. The fundamental cause of this situation is that the design of communication subsystems

Olivier Aumage; Elisabeth Brunet; Nathalie Furmento; Raymond Namyst

2007-01-01

260

Topology Control for Fault-Tolerant Communication in Highly Dynamic Wireless  

E-print Network

Topology Control for Fault-Tolerant Communication in Highly Dynamic Wireless Networks Bernd the particular neighbors a node may directly communicate with, topology control maintains a (sparse) overlay wireless networks require some dedicated communication hardware for every link. For example, CDMA needs

261

The Development and Validity Investigation of a Classroom Communication Apprehension Scale for Japanese High School Students.  

ERIC Educational Resources Information Center

The purpose of this study was to examine the construct validity of a classroom communication apprehension scale. Subjects were 196 high school students in Japan. The original English version of a classroom communication apprehension scale (M. R. Neer, 1987) consisted of 20 items representing 2 hypothesized dimensions of classroom communication

Anzai, Shinobu; Paik, Chie Matsuzawa

262

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

263

Short Communication: In vitro assessment of antioxidant, antibacterial and phytochemical analysis of peel of Citrus sinensis.  

PubMed

Antibacterial effect of Citrus sinensis peel extracts was evaluated against several pathogenic bacteria associated with human and fish infections viz., Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumonia, Staphylococcus aureus, Streptococcus pyogenes, Staphylococcus epidermidis, Serratia marcesnces, Shigella flexneri, Enterobacter amnigenus, Salmonella Typhimurium and Serratia odorifera. Methanol, ethanol, chloroform and diethyl ether solvents were used for extraction. In vitro antibacterial activity was analyzed by agar well and agar disc diffusion methods. It was found that ethanol extract showed highly significant inhibition of E. coli and K. pneumonia (12.60.94 mm and 11.61.2 mm) whereas methanol extract of C. sinensis also showed high zone of inhibition of S. odorifera (10.02.16 mm). The potential activity of active extracts was assessed and also compared with standard antibiotics through activity index formulation. The order of antioxidant activity through ABTS+ and DPPH free radical scavenging activity was ethanol>methanol>chloroform>diethyl ether. Phytochemical screening of all solvents had determined the presence of terpenoids, alkaloids, steroids, glycosides and flavonoids. It was also found that Chloroform/Methanol (5:5) and Butanol/Ethanol/Water (4:1:2.2) solvent systems showed significant separation of active phytochemical constituents. These findings reveal the potential use of C. sinensis peel to treat infectious diseases, which are being caused by microorganisms. PMID:25553700

Mehmood, Basharat; Dar, Kamran Khurshid; Ali, Shaukat; Awan, Uzma Azeem; Nayyer, Abdul Qayyum; Ghous, Tahseen; Andleeb, Saiqa

2015-01-01

264

Short Communication: New Recognition Of Enterovirus Infections In Bottlenose Dolphins (Tursiops Truncatus)  

PubMed Central

An enterovirus was cultured from an erosive tongue lesion of a bottlenose dolphin (Tursiops truncatus). The morphology of virions on negative staining electron microscopy was consistent with those of enteroviruses. Analysis of 2613 bp of the polyprotein gene identified the isolate as a novel enterovirus strain, tentatively named bottlenose dolphin enterovirus (BDEV), that nests within the species Bovine enterovirus. Serologic evidence of exposure to enteroviruses was common in both free ranging and managed collection dolphins. Managed collection dolphins were more likely to have high antibody levels, although the highest levels were reported in free ranging populations. Associations between enterovirus antibody levels, and age, sex, complete blood counts, and clinical serum biochemistries were explored. Dolphins with higher antibody levels were more likely to be hyperproteinemic and hyperglobulinemic. PMID:19581059

Nollens, Hendrik H.; Rivera, Rebecca; Palacios, Gustavo; Wellehan, James F. X.; Saliki, Jeremiah T.; Caseltine, Shannon L.; Smith, Cynthia R.; Jensen, Eric D.; Hui, Jeffrey; Lipkin, W. Ian; Yochem, Pamela K.; Wells, Randall S.; St. Leger, Judy; Venn-Watson, Stephanie

2014-01-01

265

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

266

Short communication: Genetic parameters for fertility-related disorders in Norwegian Red.  

PubMed

Heritabilities and genetic correlations were estimated for the 4 most common fertility-related disorders in Norwegian Red: retained placenta, cystic ovaries, silent heat, and metritis. Data on 1,747,500 lactations from 780,114 cows calving from January 2001 through December 2011 were analyzed using multivariate threshold sire models to estimate variance components for the 4 disorders in the first 5 lactations. The traits were defined as binary within lactation (0=unaffected, 1=affected), and each fertility-related disorder was analyzed separately with the 5 lactations as correlated traits. The mean frequency of affected cows ranged from 0.5 to 1.7% for cystic ovaries, 0.7 to 1.1% for metritis, 1.3 to 3.4% for retained placenta, and 1.7 to 2.7% for silent heat. Posterior means (standard deviations) of heritability of liability ranged from 0.02 (0.01) to 0.12 (0.01), and were lowest for silent heat and highest for cystic ovaries. Genetic correlations across lactation within disorder were positive and moderate to high, ranging from 0.79 to 0.95 for cystic ovaries, 0.40 to 0.75 for metritis, 0.53 to 0.94 for retained placenta, and 0.39 to 0.83 for silent heat. PMID:25497813

Haugaard, Katrine; Heringstad, Bjrg

2015-02-01

267

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

268

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

269

Short communication: renal tubular vacuolation in animals treated with polyethylene-glycol-conjugated proteins.  

PubMed

During toxicologic evaluation of a dimeric PEG-linked protein, tumor necrosis factor binding protein (TNF-bp), vacuolation of renal cortical tubular epithelium was seen in male and female Sprague-Dawley rats (200-300 g) given i.v. doses of 40, 20, or 10 mg/kg every other day for 3 months. Tubular lesions in rats treated with 20 or 40 mg/kg for 3 months were only partially reversible after a 2-month recovery period. Despite the presence of marked vacuolation, there were no changes in BUN, creatinine, urinalysis parameters, urinary NAG, urinary B2-microglobulin, or fractional sodium excretion. Single i.v. doses > or = 20 mg/kg TNF-bp caused similar but milder changes. However, equivalent doses of PEG alone or the non-PEG-linked TNF-bp did not cause light microscopic evidence of vacuolation. Treatment of rats with another PEG-linked protein of similar molecular weight resulted in similar changes. Immunostaining for TNF-bp revealed positivity in the apical cytoplasm of renal tubular epithelium within 1 h of i.v. dosing. Immunostaining of kidneys from chronically dosed rats indicated that protein was present in some vacuoles as long as dosing continued; however, kidneys from animals on a reversibility study had vacuoles but no immunostaining for TNF-bp. These results, along with a study that showed more severe lesions with PEG-linked proteins of lower molecular weight and minimal if any lesions with PEG-linked proteins > 70 kDa, suggest that TNF-bp is filtered through the glomerulus and that the protein with attached PEG is reabsorbed by the proximal tubules. Vacuolation may be a result of fluid distension of lysosomes due to the hygroscopic nature of PEG. These studies demonstrated that PEG-linked proteins have the capacity to induce renal tubular vacuolation at high doses. However, the change was not associated with alteration of clinical pathology or functional markers. PMID:9579027

Bendele, A; Seely, J; Richey, C; Sennello, G; Shopp, G

1998-04-01

270

Short communication: intermediate prevalence of HIV type 1 primary antiretroviral resistance in Cear State, Northeast Brazil.  

PubMed

Brazil is a large developing country where almost all FDA-licensed antiretrovirals are made available to more than 200,000 individuals under antiretroviral treatment. General primary HIV-1 resistance in Brazil is assumed to be low, but data are scarce, especially in the Northeast region. To evaluate the prevalence of primary HIV-1 antiretroviral resistance in the state of Cear, Brazil, a cross-sectional prospective study of antiretroviral-naive HIV-1-infected individuals was performed between May 2008 and May 2009. Genomic sequences of reverse transcriptase and protease regions of the pol gene of HIV-1 using PCR products were obtained. Mutations related to resistance to NRTI, NNRTI, and PI were evaluated according to the WHO mutation list for primary resistance surveillance, which excludes common polymorphisms. Seventy-four individuals were evaluated (50% male) with a median age 30 years; 55.4% were men who have sex with men. Median CD4(+) T lymphocyte counts were 418 and 960 cells/mm(3) and the median viral loads were 4.41 and 4.46 log(10) RNA copies/ml for individuals older and younger that 18 years, respectively. Twenty-seven percent of patients were symptomatic. Five patients (6.8%) were recently infected, as detected by the BED test. The mutations 41L, 67N, 215D, 219Q, 101E, and 103N in the RT and 32I, 46I, 54V, 82T, and 90M, in the PR were identified in 9.5% of samples, more frequently in HIV subtype B (85.1%). A significant level of primary HIV resistance was detected in urban Northeast Brazil, a region geographically distant from the more highly populated and wealthier areas of Southeast Brazil, and this emphasizes the need for monitoring resistance in the studied area. PMID:20929346

Arruda, Erico; Simes, Leda; Sucupira, Ceclia; Medeiros, Melissa; Arruda, Eurico; Diaz, Ricardo S; Lima, Aldo

2011-02-01

271

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

272

Short communication: Limit feeding affects behavior patterns and feeding motivation of dairy heifers.  

PubMed

The study objective was to assess the effects of limit feeding dairy heifers on behavior patterns and feeding motivation. Ten Holstein heifers (291.639.2d of age, weighing 324.261.2kg; mean SD) were exposed to each of 2 dietary treatments, in a random order, over 2 successive 26-d treatment periods (14-d adaptation period and a 12-d data collection period) using a crossover design: (1) a high-forage total mixed ration (TMR), provided ad libitum (CON) and (2) a low-forage TMR, limit-fed at 2.05% body weight (LF). Heifers were fed daily at 1100h and motivation to access a low-nutritive feedstuff (straw) was assessed using a push-door apparatus at 2 time points: 3h after feed delivery (1400h) and 21h after feed delivery (0800h). The amount of weight pushed, weight pushed as percentage of body weight, and latency to access the push door were recorded on 3 different days for each heifer at each time point on each treatment. When fed CON, heifers had greater dry matter intake (12.9 vs. 7.2kg/d), greater feeding time (209.3 vs. 82.4min/d), greater ruminating time (452.2 vs. 318.3min/d), and slower rates of intake (0.06 vs. 0.09kg of dry matter/min) than when fed LF. Heifers fed LF pushed more weight as a percentage of body weight at 3h (4.5 vs. 1.9%) and 21h (9.3 vs. 2.8%) after feed delivery. At both 3 and 21h after feed delivery, latency to access the door was shorter for the LF heifers compared with the CON heifers (65 vs. 145 s). These results indicate that, in addition to decreasing feeding time, limit feeding increases motivation of heifers to access a low-nutritive feedstuff, possibly due to lack of satiety resulting from lack of physical fill or insufficient time spent foraging. PMID:25497811

Greter, A M; Miller-Cushon, E K; McBride, B W; Widowski, T M; Duffield, T F; DeVries, T J

2015-02-01

273

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 75.9 0.4 for female students compared with 72.3 0.6 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 82.4 0.6 and this grade was greater than all other majors. Students classified as "other" had a final score of 74.4 0.8, which was greater than agricultural science majors (69.5 0.9). The APSC grade (72.6 0.5) was higher than the agricultural science majors. Junior students had significantly greater final grades (76.1 0.5) than sophomores (73.3 0.6) and seniors (72.9 0.9). 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

274

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

275

High-temperature superconducting matching networks for electrically short monopole antennas  

Microsoft Academic Search

The benefits of using thin-film high-temperature superconducting (HTS) matching networks for electrically short monopole antennas are demonstrated. Their performance was compared with that of similar matching networks made with gold, showing an efficiency improvement of 2 dB. A two-element array was also designed, fabricated, and tested using HTS matching networks and short monopoles. The matching networks were configured as microstrip

A. Y. Piatnicia; S. H. Talisa; J. R. Gavaler; M. A. Janocko; J. Talvacchio; M. J. Buckley; K. M. Leader; J. A. Moellers; M. R. Schrote

1993-01-01

276

Limitation of the short-circuit ruggedness of high-voltage IGBTs  

Microsoft Academic Search

In this paper, the destruction mechanism, which limits the short-circuit capability of high voltage IGBTs utilizing N-buffer structures will be described. The failure mechanism was studied using a combination of device simulations and experimental investigations of 3.3 kV, 4.5 kV and 6.5 kV IGBTs. It was found that the limiting short-circuit failure in these IGBTs is caused by a current

A. Kopta; M. Rahimo; U. Schlapbach; N. Kaminski; D. Silber

2009-01-01

277

Communication  

Microsoft Academic Search

\\u000a Communication impairment is a core deficit associated with autism spectrum disorder (ASD). Therefore, it should not be surprising\\u000a that this topic has become a major thrust of assessment and treatment in applied behavior analysis (ABA). The types of communication\\u000a skills to target for intervention and the behavioral assessment methods that can be used to identify these target behaviors\\u000a are reviewed

Jeff Sigafoos; Mark F. OReilly; Giulio E. Lancioni

278

METRO: A Router Architecture for High-Performance, Short-Haul Routing Networks  

E-print Network

METRO: A Router Architecture for High-Performance, Short-Haul Routing Networks Andr4 DeHon The Multipath Enhanced Transit Router Organi- zation (METRO) as a jlexib!e routing architecture for high-performance, tightly-coupled, multiprocessors and routing hubs. A METRO router is a dilated cross- bar routing

DeHon, André

279

metro: A Router Architecture for High-Performance, Short-Haul Routing Networks  

E-print Network

metro: A Router Architecture for High-Performance, Short-Haul Routing Networks Andre DeHon Transit Router Organi- zation (metro) is a exible routing architecture for high-performance, tightly-coupled, multiprocessors and routing hubs. A metro router is a dilated cross- bar routing component supporting half

Chong, Frederic T.

280

Short sequence-paper Effect of high pressure and reversed micelles on the fluorescent proteins  

E-print Network

Short sequence-paper Effect of high pressure and reversed micelles on the fluorescent proteins perturbations were applied to ECFP, EGFP, EYFP and DsRed fluorescent proteins: high hydrostatic pressure Received 6 June 2003; received in revised form 6 June 2003; accepted 27 June 2003 Abstract Two physico-chemical

Verkhusha, Vladislav V.

281

SHORT COMMUNICATIONS General Biology  

E-print Network

primarily in cen- tral Brazil) is the second largest biome in South America. This region encompasses an area). The vegetation types of the cer- rado region range from grassland (campo) to dense savannah (cerradão). Gallery

Linder, Eric

282

Short Distance Wireless Communications  

Microsoft Academic Search

\\u000a Since the publication of the first biomedical swallowable telemetry device in 1957, an immense evolution has taken place in\\u000a biomedical monitoring, stimulation and instrumentation, that would have been impossible without the use of wireless information\\u000a transmission. The first section gives an overview of wireless methods for transmitting information to and from biomedical\\u000a implants, followed by a practical introduction on analog

Robert Puers; Jef Thon

283

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

284

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.

0000-00-00

285

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

286

RXTE Observations of Hercules X-1 During the July 1998 Short-high State  

E-print Network

We present RXTE monitoring of the eclipsing X-ray binary Hercules X-1 conducted over the short-high state of July 1998. This was one of the last major short-high states before the source entered an anomalous low-state of activity. A comparison with previous epochs finds no evidence for special behavior during these observations. We determine orbital and pulsar spin periods to facilitate measurements period derivatives during the subsequent anomalous low state and during the next epoch of high-state activity. Spectrally, the decay of the short-high state and concurrent pre-eclipse dips are consistent with obscuration of a central X-ray source by a cloud of non-uniform column density. The standard model of a warped accretion disk of finite vertical scale height fits the characteristics of this absorber well. Pre-eclipse dips have durations a factor of a few longer than the characteristic durations of dips during main-high states. Pulse profile structure increases in complexity towards the tail of the short-high state suggesting changes in accretion curtain geometry.

Martin Still; Kieran O'Brien; Keith Horne; Danny Hudson; Bram Boroson; Saeqa Dil Vrtilek; Hannah Quaintrell; Hauke Fiedler

2001-02-06

287

Communications  

ERIC Educational Resources Information Center

Scholars representing the field of communications were asked to identify what they considered to be the most exciting and imaginative work currently being done in their field, as well as how that work might change our understanding. The scholars included Jeremy Bailenson, Patrice Buzzanell, Stanley Deetz, David Tewksbury, Robert J. Thompson, and

Bailenson, Jeremy; Buzzanell, Patrice; Deetz, Stanley; Tewksbury, David; Thompson, Robert J.; Turow, Joseph; Bichelmeyer, Barbara; Bishop, M. J.; Gayeski, Diane

2013-01-01

288

ACCELERATED COMMUNICATION Di(2-ethylhexyl) phthalate Is a Highly Potent Agonist for the  

E-print Network

ACCELERATED COMMUNICATION Di(2-ethylhexyl) phthalate Is a Highly Potent Agonist for the Human the common plasticizer, di(2- ethylhexyl) phthalate (DEHP), as a highly potent and uniquely selective agonist

Omiecinski, Curtis

289

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

NASA Astrophysics Data System (ADS)

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

1994-03-01

290

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

291

Forecasting the Short-Term Passenger Flow on High-Speed Railway with Neural Networks  

PubMed Central

Short-term passenger flow forecasting is an important component of transportation systems. The forecasting result can be applied to support transportation system operation and management such as operation planning and revenue management. In this paper, a divide-and-conquer method based on neural network and origin-destination (OD) matrix estimation is developed to forecast the short-term passenger flow in high-speed railway system. There are three steps in the forecasting method. Firstly, the numbers of passengers who arrive at each station or depart from each station are obtained from historical passenger flow data, which are OD matrices in this paper. Secondly, short-term passenger flow forecasting of the numbers of passengers who arrive at each station or depart from each station based on neural network is realized. At last, the OD matrices in short-term time are obtained with an OD matrix estimation method. The experimental results indicate that the proposed divide-and-conquer method performs well in forecasting the short-term passenger flow on high-speed railway. PMID:25544838

Xie, Mei-Quan; Li, Xia-Miao; Zhou, Wen-Liang; Fu, Yan-Bing

2014-01-01

292

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

E-print Network

= relative levels of MCPyV) were detected (0.328­0.772 copies/cell (Merkel cell carcinoma (MCC) = 1.0)) usingSHORT 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

Boyer, Edmond

293

Experimental performance evaluation of short duration high speed flow shock tunnel  

Microsoft Academic Search

This paper describes the experimental procedure to evaluate the performance of short duration high speed flow shock tunnel located at the Universiti Tenaga Nasional UNITEN. The experimental work includes measurements of pressure, peak pressure, shock strength and shock speed. Physical description of the facility along with the principle of operation is presented. The pressure history of flow process was captured

Al-Falahi Amir; M. Z. Yusoff; Diyar I. Ahmed; N. H. Shuaib

2009-01-01

294

Modeling, monitoring and control strategies for high temperature short time pasteurization systems 1. Empirical model development  

Microsoft Academic Search

Dynamic models of high temperature short time (HTST) pasteurization systems can be developed by using empirical model development paradigms such as transfer functions and times series models. Properly designed experiments that excite all output variables provide good data that enable the development of accurate dynamic models. These models are used in feedback control and statistical process monitoring system design. The

Antoine Negiz; Peter Ramanauskas; Ali inar; Joseph E. Schlesser; David J. Armstrong

1998-01-01

295

High-power parametric conversion from near-infrared to short-wave infrared  

E-print Network

dispersion measurement of optical fibers with a tunable fiber laser," IEEE Photon. Technol. Lett. 18, 1825High-power parametric conversion from near-infrared to short-wave infrared Adrien Billat,1,* Steevy up to 700 mW of power at 1940 nm. The source is tunable over wavelength intervals comprised between

Dalang, Robert C.

296

Advances in high power, short pulse, fiber laser sy stems and technology  

Microsoft Academic Search

We review recent advances in Yb fiber lasers and a mplifiers for high power short pulse systems. We go on to describe associated recent de velopments in fiber components for use in such systems. Examples include microstructured optical fibers for pulse compression and supercontinuum generation, and advanced fiber grati ng technology for chirped-pulse amplifier systems.

J. H. V. Price; A. Malinowski; A. Piper; T. M. Monro; M. Ibsen; B. C. Thomsen; Y. Jeong; C. Codemard; M. A. F. Roelens; P. Dupriez; J. K. Sahu; J. Nilsson; D. J. Richardson

297

Monitoring long distance WDM communication lines using a high-loss loopback supervisory system  

NASA Astrophysics Data System (ADS)

In this paper, we present experimental results for monitoring long distance WDM communication links using a line monitoring system suitable for legacy optically amplified long-haul undersea systems. This monitoring system is based on setting up a simple, passive, low cost high-loss optical loopback circuit at each repeater that provides a connection between the existing anti-directional undersea fibres, and can be used to define fault location. Fault location is achieved by transmitting a short pulse supervisory signal along with the WDM data signals where a portion of the overall signal is attenuated and returned to the transmit terminal by the loopback circuit. A special receiver is used at the terminal to extract the weakly returned supervisory signal where each supervisory signal is received at different times corresponding to different optical repeaters. Therefore, the degradation in any repeater appears on its corresponding supervisory signal level. We use a recirculating loop to simulate a 4600 km fibre link, on which a high-loss loopback supervisory system is implemented. Successful monitoring is accomplished through the production of an appropriate supervisory signal at the terminal that is detected and identified in a satisfactory time period after passing through up to 45 dB attenuation in the loopback circuit.

Nahas, Mousaab M.; Blow, Keith J.

2012-05-01

298

Achieving high gain and large bandwidth using hybrid DR antennas to feed short horns  

Microsoft Academic Search

Most high-gain antennas are narrow band and most wideband antennas have low gains. In this paper we present a low-profile antenna with a large impedance bandwidth, and high gain over the large impedance bandwidth. This is achieved by integrating a wideband hybrid DR on patch (DRoP) with a surface-mounted short horn (SMSH). Performance of antennas with two types of DRoP

Nasimuddin; K. Esselle

2007-01-01

299

Anomalous high photoconductivity in short channel indium-zinc-oxide photo-transistors  

NASA Astrophysics Data System (ADS)

Upon light exposure, an indium-zinc-oxide (IZO) thin-film transistor (TFT) presents higher photoconductivity by several orders of magnitude at the negative gate bias region. Among various device geometrical factors, scaling down the channel length of the photo-transistor results in an anomalous increase in photoconductivity. To probe the origin of this high photoconductivity in short-channel device, we measured transient current, current-voltage, and capacitance-voltage characteristics of IZO-TFTs with various channel lengths and widths before and after illumination. Under the illumination, the equilibrium potential region which lies far from front interface exists only in short-channel devices, forming the un-depleted conducting back channel. This region plays an important role in carrier transport under the illumination, leading to high photoconductivity in short-channel devices. Photon exposure coupled with gate-modulated band bending for short-channel devices leads to the accumulation of Vo++ at the front channel and screening negative gate bias, thereby generating high current flow in the un-depleted back-channel region.

Choi, Hyun-Sik; Jeon, Sanghun

2015-01-01

300

Application of advanced high speed turboprop technology to future civil short-haul transport aircraft design  

NASA Technical Reports Server (NTRS)

With an overall goal of defining the needs and requirements for short-haul transport aircraft research and development, the objective of this paper is to determine the performance and noise impact of short-haul transport aircraft designed with an advanced turboprop propulsion system. This propulsion system features high-speed propellers that have more blades and reduced diameters. Aircraft are designed for short and medium field lengths; mission block fuel and direct operating costs (DOC) are used as performance measures. The propeller diameter was optimized to minimize DOC. Two methods are employed to estimate the weight of the acoustic treatment needed to reduce interior noise to an acceptable level. Results show decreasing gross weight, block fuel, DOC, engine size, and optimum propfan diameter with increasing field length. The choice of acoustic treatment method has a significant effect on the aircraft design.

Conlon, J. A.; Bowles, J. V.

1978-01-01

301

Ultra high frequency follow-on communications satellite system  

NASA Astrophysics Data System (ADS)

The existing constellation of UHF communications satellites (LEASAT and FLTSAT) provide key command and control links for mobile forces of the DoD and other government agencies. The UHF Follow-On satellite program will provide for a new generation of communications satellites to replace the existing ones as they reach the end of their life cycle beginning in 1992. Continued coverage is required for both peacetime and crisis environments, and must be maintained indefinitely. An eight-satellite UFO constellation (two per coverage area) will replenish the existing FLTSATCOM constellation.

Hassien, Michael J.

1992-03-01

302

392 SHORT COMMUNICATIONS The Condor, Vol. 111, Number 2, pages 392395. ISSN 0010-5422, electronic ISSN 1938-5422. 2009 by The Cooper Ornithological Society. All rights reserved. Please direct  

E-print Network

392 SHORT COMMUNICATIONS The Condor, Vol. 111, Number 2, pages 392­395. ISSN 0010-5422, electronic, initiation date, nest aban- donment, nest failure, Red-faced Warbler, snowstorm, weather. The Condor 111

Conway, Courtney J.

303

New Prospects for High Performance SONAR, Chemical Sensor, and Communication Device Materials  

E-print Network

New Prospects for High Performance SONAR, Chemical Sensor, and Communication Device Materials in Naval SONAR, chemical sensor and communications devices. We elucidate the influence of the constituent of applications, such as sensing, data storage, and energy conversion. In current military SONAR devices

Rappe, Andrew M.

304

Controlling system design of high speed stepping motor based on serial communication  

Microsoft Academic Search

This paper introduces a controlling system of high speed stepping motor which combines singlechip and serial communication. This system contains the upper machine which is a PC, and the lower machine which is a singlechip. The upper machine communicates with the lower machine through serial port. An accelerating process is required because corresponding pulse frequency of regulated rotating speed is

Hui Tan; Mingliang Huang; Qi Zhang; Yi Liu

2011-01-01

305

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

306

Quantum secure direct communication with high-dimension quantum superdense coding  

SciTech Connect

A protocol for quantum secure direct communication with quantum superdense coding is proposed. It combines the ideas of block transmission, the ping-pong quantum secure direct communication protocol, and quantum superdense coding. It has the advantage of being secure and of high source capacity.

Wang Chuan; Li Yansong; Liu Xiaoshu [Key Laboratory for Quantum Information and Measurements, and Department of Physics, Tsinghua University, Beijing 100084 (China); Deng Fuguo [Key Laboratory for Quantum Information and Measurements, and Department of Physics, Tsinghua University, Beijing 100084 (China); Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, and Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875 (China); Long Guilu [Key Laboratory for Quantum Information and Measurements, and Department of Physics, Tsinghua University, Beijing 100084 (China); Key Laboratory for Atomic and Molecular NanoSciences, Tsinghua University, Beijing 100084 (China)

2005-04-01

307

Highly Efficient Amplifier for Ka-Band Communications  

NASA Technical Reports Server (NTRS)

An amplifier developed under a Small Business Innovation Research (SBIR) contract will have applications for both satellite and terrestrial communications. This power amplifier uses an innovative series bias arrangement of active devices to achieve over 40-percent efficiency at Ka-band frequencies with an output power of 0.66 W. The amplifier is fabricated on a 2.0- by 3.8-square millimeter chip through the use of Monolithic Microwave Integrated Circuit (MMIC) technology, and it uses state-of-the-art, Pseudomorphic High-Electron-Mobility Transistor (PHEMT) devices. Although the performance of the MMIC chip depends on these high-performance devices, the real innovations here are a unique series bias scheme, which results in a high-voltage chip supply, and careful design of the on-chip planar output stage combiner. This design concept has ramifications beyond the chip itself because it opens up the possibility of operation directly from a satellite power bus (usually 28 V) without a dc-dc converter. This will dramatically increase the overall system efficiency. Conventional microwave power amplifier designs utilize many devices all connected in parallel from the bias supply. This results in a low-bias voltage, typically 5 V, and a high bias current. With this configuration, substantial I(sup 2) R losses (current squared times resistance) may arise in the system bias-distribution network. By placing the devices in a series bias configuration, the total current is reduced, leading to reduced distribution losses. Careful design of the on-chip planar output stage power combiner is also important in minimizing losses. Using these concepts, a two-stage amplifier was designed for operation at 33 GHz and fabricated in a standard MMIC foundry process with 0.20-m PHEMT devices. Using a 20-V bias supply, the amplifier achieved efficiencies of over 40 percent with an output power of 0.66 W and a 16-dB gain over a 2-GHz bandwidth centered at 33 GHz. With a 28-V bias, a power level of 1.1 W was achieved with a 12-dB gain and a 36-percent efficiency. This represents the best reported combination of power and efficiency at this frequency. In addition to delivering excellent power and gain, this Ka-band MMIC power amplifier has an efficiency that is 10 percent greater than existing designs. The unique design offers an excellent match for spacecraft applications since the amplifier supply voltage is closely matched to the typical value of spacecraft bus voltage. These amplifiers may be used alone in applications of 1 W or less, or several may be combined or used in an array to produce moderate power, Ka-band transmitters with minimal power combining and less thermal stress owing to the combination of excellent efficiency and power output. The higher voltage operation of this design may also save mass and power because the dc-dc power converter is replaced with a simpler voltage regulator.

1996-01-01

308

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

309

Short-time dynamics at a conical intersection in high-harmonic spectroscopy.  

PubMed

High-harmonic spectroscopy probes molecular dynamics using electrons liberated from the same molecule earlier in the laser cycle. It affords sub-ngstrom spatial and subfemtosecond temporal resolution. Nuclear dynamics in the intermediate cation influence the spectrum of the emitted high-harmonic photons through an autocorrelation function. Here, we develop an analytical approach for computing short-time nuclear autocorrelation functions in the vicinity of conical intersections, including laser-induced and nonadiabatic coupling between the surfaces. We apply the technique to two molecules of current experimental interest, C6H6 and C6H5F. In both molecules, high-harmonics generated within the same electronic channel are not sensitive to nonadiabatic dynamics, even in the presence of substantial population transfer. Calculated autocorrelation functions exhibit significant deviations from the expected Gaussian decay and may undergo revivals at short (?1.5 fs) times. The associated phase of the nuclear wavepacket provides a possible experimental signature. PMID:25314638

Patchkovskii, Serguei; Schuurman, Michael S

2014-12-26

310

Smart MEMS concept for high secure RF and millimeterwave communications  

Microsoft Academic Search

This paper presents a fully suspended MEMS based technology to assess the smart microsystem concept. The demonstrator is a redundancy ring for millimeterwave space communication. Reliability investigations are presented showing that the membrane is withstanding thermal stress, vibration and shocks. Concerning the switch, the main reliability behavior deals with the dielectric charging. We present a devoted DC life test stress

D. Dubuc; M. Saddaoui; S. Mell; F. Flourens; L. Rabbia; B. Ducarouge; K. Grenier; P. Pons; A. Boukabache; L. Bary; A. Takacs; H. Aubert; O. Vendier; J. L. Roux; R. Plana

2004-01-01

311

A secure high-speed retrodirective communication link  

Microsoft Academic Search

A retrodirective array with adaptive interference rejection is developed to introduce additional functionality to conventional retrodirective arrays. This is the first retrodirective array to present an interference rejection mode, creating a secure wireless communication link. The array uses digital signal processing initially and periodically to determine the location of a jamming signal and directs sub-arrays to form a in the

Darren S. Goshi; Kevin M. K. H. Leong; Tatsuo Itoh

2005-01-01

312

Toward High-Performance Communications Interfaces for Science Problem Solving  

ERIC Educational Resources Information Center

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

Oviatt, Sharon L.; Cohen, Adrienne O.

2010-01-01

313

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

314

Graphic Communications. Industrial Arts. Performance Objectives. Junior High School.  

ERIC Educational Resources Information Center

Several intermediate performance objectives and corresponding criterion measures are listed for a graphic communications course for seventh, eighth, and ninth grade students. The seventh grade section includes eight terminal objectives for a 9-week course and covers the basic fundamentals of photography, bookbinding, and silk screening. The eighth

Duval County School Board, Jacksonville, FL.

315

Demo Abstract: Claytronics Highly Scalable Communications, Sensing, and Actuation Networks  

E-print Network

out the possibility of radically altering the relationship between computation, humans.9 [Artificial Intelligence]: Robotics ­ modular reconfigurable robots. C.2.4 [Computer Communications Networks to morph into three-dimensional scenes, eventually with sufficient fidelity so as to convince a human

Gibbons, Phillip B.

316

Nonlinear pair production in scattering of photons on ultra-short laser pulses at high energy  

E-print Network

We consider scattering of a photon on a short intense laser pulse at high energy. We argue that for ultra-short laser pulses the interaction is coherent over the entire length of the pulse. At low pulse intensity $I$ the total cross section for electron-positron pair production is proportional to $I$. However, at pulse intensities higher than the characteristic value $I_s$, the total cross section saturates -- it becomes proportional to the logarithm of intensity. This nonlinear effect is due to multi-photon interactions. We derive the total cross section for pair production at high energies by resuming the multi-photon amplitudes to all orders in intensity. We calculate the saturation intensity $I_s$ and show that it is significantly lower than the Schwinger's critical value. We discuss possible experimental tests.

Kirill Tuchin

2010-02-15

317

Airborne ISR mesh high-speed communication via satellite  

Microsoft Academic Search

LinkWayS2, the mesh IP satellite communications system for the Army's Warfighter Information Network-Tactical (WIN-T) and Marine's Support Wide Area Network (SWAN) program, has proven itself over the last decade to be the fastest and most flexible mesh MF-TDMA modem available. Traditionally utilized predominantly in fixed or At-The Halt (ATH) applications, new improvements in the LinkWayS2 waveform make ground-mobile and even

Lawrence E. Kingsley; Phil Chacon; Michael Geist; Punit Mukhija; Tom Bernritter

2011-01-01

318

High-rate synthetic aperture communications in shallow water.  

PubMed

Time reversal communication exploits spatial diversity to achieve spatial and temporal focusing in complex ocean environments. Spatial diversity can be provided easily by a vertical array in a waveguide. Alternatively, spatial diversity can be obtained from a virtual horizontal array generated by two elements, a transmitter and a receiver, due to relative motion between them, referred to as a synthetic aperture. This paper presents coherent synthetic aperture communication results from at-sea experiments conducted in two different frequency bands: (1) 2-4 kHz and (2) 8-20 kHz. Case (1) employs binary-phase shift-keying modulation, while case (2) involves up to eight-phase shift keying modulation with a data rate of 30 kbits/s divided by the number of transmissions (diversity) to be accumulated. The receiver utilizes time reversal diversity combining followed by a single channel equalizer, with frequent channel updates to accommodate the time-varying channel due to coupling of space and time in the presence of motion. Two to five consecutive transmissions from a source moving at 4 kts over 3-6 km range in shallow water are combined successfully after Doppler compensation, confirming the feasibility of coherent synthetic aperture communications using time reversal. PMID:20000919

Song, H C; Hodgkiss, W S; Kuperman, W A; Akal, T; Stevenson, M

2009-12-01

319

High-power single-mode solid-state laser with a short, wide unstable cavity  

Microsoft Academic Search

A wide, short unstable cavity laser design is proposed for high-power, single-longitudinal, single-transverse-mode emission from a solid-state laser. Such a laser combines the single-mode master oscillator and the single-mode amplifier in a single piece. Design formulas are suggested; the efficiency and conditions of the single-longitudinal-mode operation are analyzed. Examples with Nd:YAG and Yb:YAG are considered. For a device of a

Dmitrii Kouznetsov; Jean-Franois Bisson; Kazunori Takaichi; Ken-Ichi Ueda

2005-01-01

320

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

Microsoft Academic Search

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

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

2004-01-01

321

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

322

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

323

QoS-aware Bridge for High-speed Powerline Communication and Ethernet  

Microsoft Academic Search

Recently, high-speed powerline communication gets great attention as the home network backbone for multimedia services because of the low cost and QoS support. Since a home network is mixed with various types of networks, the high-speed powerline communication is often connected with non-QoS networks such as Ethernet. Then it is very difficult to provide end-to-end QoS for multimedia services in

Junhee Park; Kwangil Lee; Kyeongdeok Moon

2007-01-01

324

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

325

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

326

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 50, NO. 1, JANUARY 2002 31 Iterative Interference Cancellation for High Spectral Efficiency Satellite  

E-print Network

Cancellation for High Spectral Efficiency Satellite Communications Bassel F. Beidas, Hesham El Gamal, and Stan feedback, multiuser de- tection, satellite communications. I. INTRODUCTION THE increasingly rapid growth cancellation tech- niques for high spectral efficiency satellite communication sys- tems. We consider two

El-Gamal, Hesham

327

Neonatal overfeeding attenuates acute central pro-inflammatory effects of short-term high fat diet  

PubMed Central

Neonatal obesity predisposes individuals to obesity throughout life. In rats, neonatal overfeeding also leads to early accelerated weight gain that persists into adulthood. The phenotype is associated with dysfunction in a number of systems including paraventricular nucleus of the hypothalamus (PVN) responses to psychological and immune stressors. However, in many cases weight gain in neonatally overfed rats stabilizes in early adulthood so the animal does not become more obese as it ages. Here we examined if neonatal overfeeding by suckling rats in small litters predisposes them to exacerbated metabolic and central inflammatory disturbances if they are also given a high fat diet in later life. In adulthood we gave the rats normal chow, 3 days, or 3 weeks high fat diet (45% kcal from fat) and measured peripheral indices of metabolic disturbance. We also investigated hypothalamic microglial changes, as an index of central inflammation, as well as PVN responses to lipopolysaccharide (LPS). Surprisingly, neonatal overfeeding did not predispose rats to the metabolic effects of a high fat diet. Weight changes and glucose metabolism were unaffected by the early life experience. However, short term (3 day) high fat diet was associated with more microglia in the hypothalamus and a markedly exacerbated PVN response to LPS in control rats; effects not seen in the neonatally overfed. Our findings indicate neonatally overfed animals are not more susceptible to the adverse metabolic effects of a short-term high fat diet but may be less able to respond to the central effects. PMID:25628527

Cai, Guohui; Dinan, Tara; Barwood, Joanne M.; De Luca, Simone N.; Soch, Alita; Ziko, Ilvana; Chan, Stanley M. H.; Zeng, Xiao-Yi; Li, Songpei; Molero, Juan; Spencer, Sarah J.

2015-01-01

328

Space Link Extension (SLE) Emulation for High-Throughput Network Communication  

NASA Technical Reports Server (NTRS)

As the data rate requirements for space communications increases, signicant stressis placed not only on the wireless satellite communication links, but also on the groundnetworks which forward data from end-users to remote ground stations. These wide areanetwork (WAN) connections add delay and jitter to the end-to-end satellite communicationlink, eects which can have signicant impacts on the wireless communication link. It isimperative that any ground communication protocol can react to these eects such that theground network does not become a bottleneck in the communication path to the satellite.In this paper, we present our SCENIC Emulation Lab testbed which was developed to testthe CCSDS SLE protocol implementations proposed for use on future NASA communica-tion networks. Our results show that in the presence of realistic levels of network delay,high-throughput SLE communication links can experience signicant data rate throttling.Based on our observations, we present some insight into why this data throttling happens,and trace the probable issue back to non-optimal blocking communication which is sup-ported by the CCSDS SLE API recommended practices. These issues were presented aswell to the SLE implementation developers which, based on our reports, developed a newrelease for SLE which we show xes the SLE blocking issue and greatly improves the pro-tocol throughput. In this paper, we also discuss future developments for our end-to-endemulation lab and how these improvements can be used to develop and test future spacecommunication technologies.

Murawski, Robert; Tchorowski, Nicole; Golden, Bert

2014-01-01

329

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.

330

Does high inflation affect growth in the long and short run  

E-print Network

This paper investigates the relationship between inflation and output in the context of an economy facing persistent high inflation. By analyzing the case of Brazil, we find that inflation does not impact real output in the long run, but that in the short run there exists a negative effect from inflation on output. These results support Sidrauskis (1967) superneutrality of money in the long run, but cast doubt on the short run implications of the model for separable utility functions in consumption and real money balances, as exposed by Fischer (1979). The results are more likely to support a class of utility functions in which real money balances and consumption are perfect complements. JEL classification codes: O42, E31 Key words: inflation, growth, output

Joo Ricardo Faria; Francisco Galro Carneiro

2001-01-01

331

How to use MPI communication in highly parallel climate simulations more easily and more efficiently.  

NASA Astrophysics Data System (ADS)

In this talk we present a way to facilitate efficient use of MPI communication for developers of climate models. Exploitation of the performance potential of today's highly parallel supercomputers with real world simulations is a complex task. This is partly caused by the low level nature of the MPI communication library which is the dominant communication tool at least for inter-node communication. In order to manage the complexity of the task, climate simulations with non-trivial communication patterns often use an internal abstraction layer above MPI without exploiting the benefits of communication aggregation or MPI-datatypes. The solution for the complexity and performance problem we propose is the communication library YAXT. This library is built on top of MPI and takes high level descriptions of arbitrary domain decompositions and automatically derives an efficient collective data exchange. Several exchanges can be aggregated in order to reduce latency costs. Examples are given which demonstrate the simplicity and the performance gains for selected climate applications.

Behrens, Jrg; Hanke, Moritz; Jahns, Thomas

2014-05-01

332

SHORT COMMUNICATION High gene flow promotes the genetic homogeneity of the  

E-print Network

behaviour (Gysels et al. 2004; Berrebi et al. 2005) and have a limited swimming ability (Bardin & Pont 2002). There are few papers about P. marmoratus population genetics. Recently, Berrebi et al. (2009) analysed

Teixeira, Sara

333

Short Communication Highly oriented fibres of copper laurate obtained by melt-  

E-print Network

'examen de ces fibres par micro- scopie électronique à balayage et par diffraction des rayons X révèle un's discovery in 1972 that a very thin film of silicon monoxide deposited onto a surface at an oblique angle]. This process has become very popular with liquid crystal display manufacturers, and it is widely used

Paris-Sud XI, Université de

334

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

335

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

336

Milagro Constraints on Very High Energy Emission from Short Duration Gamma-Ray Bursts  

E-print Network

Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led to the observation of the first afterglows and the measurement of the first redshifts from this type of burst. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Seventeen short duration (100 GeV counterparts to these GRBs and find no significant emission correlated with these bursts. Due to the absorption of high-energy gamma rays by the extragalactic background light (EBL), detections are only expected for redshifts less than ~0.5. While most long duration GRBs occur at redshifts higher than 0.5, the opposite is thought to be true of short GRBs. Lack of a detected VHE signal thus allows setting meaningful fluence limits. One GRB in the sample (050509b) has a likely association with a galaxy at a redshift of 0.225, while another (051103) has been tentatively linked to the nearby galaxy M81. Fluence limits are corrected for EBL absorption, either using the known measured redshift, or computing the corresponding absorption for a redshift of 0.1 and 0.5, as well as for the case of z=0.

A. A. Abdo; B. T. Allen; D. Berley; E. Blaufuss; S. Casanova; B. L. Dingus; R. W. Ellsworth; M. M. Gonzalez; J. A. Goodman; E. Hays; C. M. Hoffman; B. E. Kolterman; C. P. Lansdell; J. T. Linnemann; J. E. McEnery; A. I. Mincer; P. Nemethy; D. Noyes; J. M. Ryan; F. W. Samuelson; P. M. Saz Parkinson; A. Shoup; G. Sinnis; A. J. Smith; G. W. Sullivan; V. Vasileiou; G. P. Walker; D. A. Williams; X. W. Xu; G. B. Yodh

2007-05-10

337

Milagro Constraints on Very High Energy Emission from Short Duration Gamma-Ray Bursts  

E-print Network

Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led to the observation of the first afterglows and the measurement of the first redshifts from this type of burst. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Seventeen short duration (100 GeV counterparts to these GRBs and find no significant emission correlated with these bursts. Due to the absorption of high-energy gamma rays by the extragalactic background light (EBL), detections are only expected for redshifts less than ~0.5. While most long duration GRBs occur at redshifts higher than 0.5, the opposite is thought to be true of short GRBs. Lack of a detected VHE signal thus allows setting meaningful fluence limits. One GRB in the sample (050509b) has a likely association with a galaxy at a redshift of 0.225, while another (051103) has been tentatively linked to the nearby galaxy M81. Fluence limits are corrected for EBL absorption, either using the known measu...

Abdo, A A; Berley, D; Blaufuss, E; Casanova, S; Dingus, B L; Ellsworth, R W; Gonzlez, M M; Goodman, J A; Hays, E; Hoffman, C M; Kolterman, B E; Lansdell, C P; Linnemann, J T; McEnery, J E; Mincer, A I; Nmethy, P; Noyes, D; Ryan, J M; Samuelson, F W; Parkinson, P M Saz; Shoup, A; Sinnis, G; Smith, A J; Sullivan, G W; Vasileiou, V; Walker, G P; Williams, D A; Xu, X W; Yodh, G B

2007-01-01

338

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

339

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

340

A new high intensity and short-pulse molecular beam valve  

NASA Astrophysics Data System (ADS)

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.

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

341

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

342

High-energy laser-pulse self-compression in short gas-filled fibers  

NASA Astrophysics Data System (ADS)

We examine the spatiotemporal compression of energetic femtosecond laser pules within short gas-filled fibers. The study is undertaken using an advanced nonlinear pulse propagation model based on a multimode generalized nonlinear Schrdinger equation that has been modified to include plasma effects. Plasma defocusing and linear propagation effects are shown to be the dominant processes within a highly dynamical mechanism that enables 100-fs pulses to be compressed into the few-cycle regime after <50mm of propagation. Once the mechanism has been introduced, parameter spaces are explored and compressor designs suitable for performing high-field experiments in situ are presented. We finish by showing how these designs may be extended to novel wavelengths and driving pulses delivered by state-of-the-art high-repetition-rate lasers.

Anderson, P. N.; Horak, P.; Frey, J. G.; Brocklesby, W. S.

2014-01-01

343

High Rising Tunes in Australian English: The Communicative Function of L* And H* Pitch Accent Onsets  

Microsoft Academic Search

This study was designed to establish the specific communicative function of both low (L*) and high (H*) pitch accent onsets with high rising tunes (HRTs), earlier established as a feature of Australian English. The data consisted of the dialogues of four female and four male adolescent speakers who were recorded while participating in the Map task. The discourse analysis involved

Jeannette McGregor; Sallyanne Palethorpe

2008-01-01

344

High performance interprocessor communication through optical wavelength division multiple access channels  

Microsoft Academic Search

A multiprocessor system with a large number of nodes can be built at low cost by combining the recent advances in high capacity channels available through optical fiber communication. A highly fault tolerant system is created with good performance characteristics at a reduction in system complexity. The system capitalizes on the optical selfrouting characteristic of wavelength division multiple access to

Patrick W. Dowd

1991-01-01

345

High Performance Interprocessor Communication through Optical Wavelength Division Multiple Access Channels  

Microsoft Academic Search

A multiprocessor system with a large number of nodes can be built at low cost by combining the recent advances in high capacity channels available through optical fiber communication. A highly fault tolerant system is created with good performance characteristics at a reduction in system complexity. The system capitalizes on the optical self-routing characteristic of wavelength division multiple access to

Patrick W. Dowd

1991-01-01

346

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.

347

Developing Students' Literacy Skills Using High-Tech Speech-Generating Augmentative and Alternative Communication Devices  

ERIC Educational Resources Information Center

This article outlines practical techniques for developing literacy skills in users of high-tech speech-generating augmentative and alternative communication (AAC) devices. The recommended strategies are intended for general classroom teachers who teach literacy skills to students with typical speech. Many students who use high-tech AAC devices

Wilkins, Julia; Ratajczak, Amy

2009-01-01

348

Short-read, high-throughput sequencing technology for STR genotyping  

PubMed Central

DNA-based methods for human identification principally rely upon genotyping of short tandem repeat (STR) loci. Electrophoretic-based techniques for variable-length classification of STRs are universally utilized, but are limited in that they have relatively low throughput and do not yield nucleotide sequence information. High-throughput sequencing technology may provide a more powerful instrument for human identification, but is not currently validated for forensic casework. Here, we present a systematic method to perform high-throughput genotyping analysis of the Combined DNA Index System (CODIS) STR loci using short-read (150 bp) massively parallel sequencing technology. Open source reference alignment tools were optimized to evaluate PCR-amplified STR loci using a custom designed STR genome reference. Evaluation of this approach demonstrated that the 13 CODIS STR loci and amelogenin (AMEL) locus could be accurately called from individual and mixture samples. Sensitivity analysis showed that as few as 18,500 reads, aligned to an in silico referenced genome, were required to genotype an individual (>99% confidence) for the CODIS loci. The power of this technology was further demonstrated by identification of variant alleles containing single nucleotide polymorphisms (SNPs) and the development of quantitative measurements (reads) for resolving mixed samples.

Bornman, Daniel M.; Hester, Mark E.; Schuetter, Jared M.; Kasoji, Manjula D.; Minard-Smith, Angela; Barden, Curt A.; Nelson, Scott C.; Godbold, Gene D.; Baker, Christine H.; Yang, Boyu; Walther, Jacquelyn E.; Tornes, Ivan E.; Yan, Pearlly S.; Rodriguez, Benjamin; Bundschuh, Ralf; Dickens, Michael L.; Young, Brian A.; Faith, Seth A.

2013-01-01

349

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

350

Effects of High Intensity White Noise on Short-Term Memory for Position in a List and Sequence  

ERIC Educational Resources Information Center

Seven experiments are described investigating the effecy of high intensity white noise during the visual presentation of words on a number of short-term memory tasks. Examines results relative to position learning and sequence learning. (Editor/RK)

Daee, Safar; Wilding, J. M.

1977-01-01

351

Thin-Film-Optics Design and Manufacturing Challenges for Large-Aperture High-Peak-Power, Short-Pulse Lasers  

SciTech Connect

High-peak-power, short-pulse laser systems require specialized thin-film coatings, primarily due to laser damage thresholds and increased spectral bandwidth. The influence of these effects is evident in wavefront performance, coating thickness, and design complexity.

Oliver,J.B.

2004-12-17

352

High repetition-rate and short pulse-width 1064nm laser in a composite crystal device  

NASA Astrophysics Data System (ADS)

Compared with lamp pumped solid state laser, laser-diode pumped all-solid-state laser (DPSL) has the characteristic of high efficiency, long life and reliable under the condition of high repetition rate. Therefore, A high repetition rate DPSL has a broad application prospect in the laser detection, laser communication and optoelectronic countermeasure and other fields. Laser-diode (LD) pumped acousto-optic(AO) Q-switch all-solid-state has attractive features, such as compact structure, reliable operation, high repetition rate and short pulse width. Laser crystal is the core component of the laser. Usually composite crystal thermal lens focal length is three times more than traditional crystal, so it can avoid the serious heating effect of the operation material bumping by the traditional method. In this paper, we present a high repetition rate acousto-optic Q-switched Nd:YVO4 laser pumped by 880nm laser diode. By using the 0.25% doping concentration Nd:YVO4 single end composite crystal size of 3*3*(4+16) mm3 , with the 50 W LD pumped power, in order to calculate the laser crystal absorption efficiency of pump light, so that more accurate calculation of light conversion efficiency, first we measured 880 nm pump light absorption, crystal is calculated on the pump light absorption efficiency of 75%; When we put in the cavity mirror to form a flat resonant cavity, we obtained the 1064 nm continuous laser output power of 26 W and 27.1 W, with the output mirror transmittance of 20% and 48%, respectively. 50.7% and 48.7% optical to optical conversion efficiency has been achieved experimentally. When we put in AO Q-switch, with the repetition rate of 50 kHz, 100 kHz and 200 kHz, the 1064 nm laser output power is 21 W, 21.28 W and 20.58 W, and the peak power is 32.9 kW, 17.3 kW, 8.5 kW, respectively. Under the high repetition rate circumstance, the pulse width is limited to 12 ns.

Wang, Zijian; Jin, Guangyong; Yu, Yongji; Zhai, Ruizhi

2014-12-01

353

Characteristics of high energy K? and Bremsstrahlung sources generated by short pulse petawatt lasers  

NASA Astrophysics Data System (ADS)

We have measured the characteristics of high energy K? sources created with the Vulcan Petawatt laser at RAL and the JanUSP laser at Lawrence Livermore National Laboratory. High energy x-ray backlighters will be essential for radiographing high energy-density experimental science targets for NIF projects especially to probe implosions and high areal density planar samples. Hard K? x-ray photons are created through relativistic electron plasma interactions in the target material after irradiated by short pulse high intensity lasers. For our Vulcan experiment, we employed a CsI scintillator charge coupled device (CCD) camera for imaging and a CCD camera for single photon counting. We have directly measured the 22 keV Ag K? source size using the RAL petawatt laser and performed knife-edge measurements of a 40 keV Sm K? source using the JanUSP laser. The measured source sizes are both 60 ?m full width half maximum. We have also measured the Ag K? conversion efficiencies. At laser intensities of 11018 W/cm2 range, the conversion efficiency at 22 keV is 110-4.

Park, H.-S.; Izumi, N.; Key, M. H.; Koch, J. A.; Landen, O. L.; Patel, P. K.; Phillips, T. W.; Zhang, B. B.

2004-10-01

354

Iterative interference cancellation for high spectral efficiency satellite communications  

Microsoft Academic Search

The problem of efficient utilization of the frequency spectrum for satellite systems is investigated; one which results as a consequence of highly crowding adjacent channels. An analytical characterization of the resulting interference channel is introduced and then exploited for interference cancellation. Two classes of cancelers are investigated. The first approach does not benefit from the forward error control (FEC) coding

Bassel F. Beidas; Hesham El Gamal; Stan Kay

2002-01-01

355

ORIGINAL COMMUNICATION High-throughput classification of clinical populations  

E-print Network

.2 %), and ADHD versus FASD versus control children with 77.3 % accuracy (chance 40.4 %). Our technique provides dysfunctions of oculomotor control and attention, including attention deficit hyperactivity disorder (ADHD deployed, low-cost, and high-throughput for clinical disor- ders, especially in young children and elderly

Munoz, Douglas Perry

356

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

357

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

358

Quercetin alleviates inflammation after short-term treatment in high-fat-fed mice.  

PubMed

Consumption of a high-fat diet (HFD) promotes reactive oxygen species (ROS) which ultimately trigger inflammation. The aim of this study was to investigate the role of Moringa oleifera leaf extract (MoLE) and its active component quercetin in preventing NF-?B-mediated inflammation raised by short-term HFD. Quercetin was found to be one of the major flavonoid components from HPLC of MoLE. Swiss mice were fed for 15 days on HFD, both with or without MoLE/quercetin. The antioxidant profile was estimated from liver homogenate. NF-?B and some relevant inflammatory markers were evaluated by immunoblotting, RT-PCR and ELISA. Significantly (P < 0.05) lower antioxidant profile and higher lipid peroxidation was found in HFD group compared to control (P < 0.05). Increased nuclear import of NF-?B and elevated expressions of pro-inflammatory markers were further manifestations in the HFD group. All these changes were reversed in the MoLE/quercetin-treated groups with significant improvement of antioxidant activity compared to the HFD group. MoLE was found to be rich in polyphenols and both MoLE and quercetin showed potent free radical and hydroxyl radical quenching activity. Thus, the present study concluded that short-term treatment with MoLE and its constituent quercetin prevent HFD-mediated inflammation in mice. PMID:23644882

Das, Nilanjan; Sikder, Kunal; Bhattacharjee, Surajit; Majumdar, Suchandra Bhattacharya; Ghosh, Santinath; Majumdar, Subrata; Dey, Sanjit

2013-06-01

359

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

360

RAPID COMMUNICATIONS This section is reserved for short submissions which contain important new results and are intended for accelerated publication.  

E-print Network

of high-mobility semiconductor devices. Recently Fujita et al. investigated a new high-resolution negative of nanometer scale and large scale structures caused by prox- imity effects. II. EXPERIMENTS A. Exposure scale structures. The requ

Ludwig-Maximilians-Universität, München

361

77 FR 55880 - Prudential Short Duration High Yield Fund, Inc. and Prudential Investments LLC; Notice of...  

Federal Register 2010, 2011, 2012, 2013

...estimated: (A) net investment income; (B) net realized short-term capital gains; (C) net realized long-term capital gains; and (D...net realized short-term capital gains; (C) net realized long-term capital gains; and...

2012-09-11

362

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

363

ATOMIC: A High-Speed Local Communication Architecture  

Microsoft Academic Search

ATOMIC2 is an inexpensive high-speed LAN built by USC\\/ISI. It is based upon Mosaic technology developed for fine-grain, message-passing, massively parallel computation. Each Mosaic processor is capable of routing variable length packets, while providing added value through simultaneous computing and buffering. ATOMIC adds a general routing capability to the native Mosaic wormhole routing through store-and-forward and path concatenation. ATOMIC aggregate

Robert Felderman; Annette DeSchon; Danny Cohen; Gregory Finn

1994-01-01

364

Netwarp: an ultra-high-throughput computer communications service  

Microsoft Academic Search

This article presents an ultra-high-throughput network service called Netwarp, which provides an instantaneous file transfer service viewed by timewidth instead of bandwidth. Four breakthrough technologies for realizing Netwarp-the PC-ONU (personal computer-optical network unit), network DMA, gigabit shared access, and the Netwarp router-are described. Sustained throughputs above 110 MB\\/s are achieved with a prototype system developed in our laboratories

T. Kanada; T. Onada; I. Yamashita; T. Aoyama

1997-01-01

365

Designing and implementing Multibeam Smart Antennas for high bandwidth UAV communications using FPGAs  

NASA Astrophysics Data System (ADS)

Requirements for high bandwidth UAV communications are often necessary in order to move large amounts of mission information to/from Users in real-time. The focus of this paper is antenna beamforming for point-to-point, high bandwidth UAV communications in order to optimize transmit and receive power and support high data throughput communications. Specifically, this paper looks at the design and implementation of Multibeam Smart Antennas to implement antenna beamforming in an aerospace communications environment. The Smart Antenna is contrasted against Fast Fourier Transform (FFT) based beamforming in order to quantify the increase in both computational load and FPGA resources required for multibeam adaptive signal processing in the Smart Antenna. The paper begins with an overall discussion of Smart Antenna design and general beamforming issues in high bandwidth communications. Important design considerations such as processing complexity in a constrained Size, Weight and Power (SWaP) environment are discussed. The focus of the paper is with respect to design and implementation of digital beamforming wideband communications waveforms using FPGAs. A Multibeam Time Delay element is introduced based on Lagrange Interpolation. Design data for Multibeam Smart Antennas in FPGAs is provided in the paper as well as reference circuits for implementation. Finally, an example Multibeam Smart Antenna design is provided based on a Xilinx Virtex-7 FPGA. The Multibeam Smart Antenna example design illustrates the concepts discussed in the paper and provides design insight into Multibeam Smart Antenna implementation from the point of view of implementation complexity, required hardware, and overall system performance gain.

Porcello, J. C.

366

Graphic Arts (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 graphic arts 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

367

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

368

High-dose short-term administration of naringin did not alter talinolol pharmacokinetics in humans.  

PubMed

Naringin is considered the major causative ingredient of the inhibition of intestinal drug uptake by grapefruit juice. Moreover, it is contained in highly dosed nutraceuticals available on the market. A controlled, open, randomized, crossover study was performed in 10 healthy volunteers to investigate the effect of high-dose naringin on the bioavailability of talinolol, a substrate of intestinal organic anion-transporting polypeptide (OATP)-mediated uptake. Following 6-day supplementation with 3 capsules of 350mg naringin daily, 100mg talinolol were administered orally with 3 capsules of the same dietary supplement (1050mg naringin) on the seventh day. This test treatment was compared to 100mg talinolol only (control). The results showed that short-term high-dose naringin supplementation did not significantly affect talinolol pharmacokinetics. Geometric mean ratios of test versus control ranged between 0.90 and 0.98 for talinolol cmax, AUC0-48h, AUC0-?, t1/2 and Ae(0-48h). The high dose may provoke inhibition of the efflux transporter P-glycoprotein (P-gp) which counteracts the uptake inhibition. As disintegration and dissolution processes are required for the solid dosage form, dissolved naringin may arrive at the site of interaction after talinolol is already absorbed. In conclusion, the effect of nutraceuticals on drug pharmacokinetics can deviate from that observed when administered as food component due to the different dose and dosage form. PMID:25486333

Nguyen, M A; Staubach, P; Tamai, I; Langguth, P

2015-02-20

369

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

370

Forward voltage short-pulse technique for measuring high power laser array junction temperature  

NASA Technical Reports Server (NTRS)

The present invention relates to a method of measuring the temperature of the P-N junction within the light-emitting region of a quasi-continuous-wave or pulsed semiconductor laser diode device. A series of relatively short and low current monitor pulses are applied to the laser diode in the period between the main drive current pulses necessary to cause the semiconductor to lase. At the sufficiently low current level of the monitor pulses, the laser diode device does not lase and behaves similar to an electronic diode. The voltage across the laser diode resulting from each of these low current monitor pulses is measured with a high degree of precision. The junction temperature is then determined from the measured junction voltage using their known linear relationship.

Meadows, Byron L. (Inventor); Amzajerdian, Frazin (Inventor); Barnes, Bruce W. (Inventor); Baker, Nathaniel R. (Inventor)

2012-01-01

371

Highly efficient white-light-emitting diodes fabricated with short-wavelength yellow oxynitride phosphors  

NASA Astrophysics Data System (ADS)

We have already reported orangish yellow Ca -?-SiAlON:Eu2+ phosphors, and applied them to fabricate warm white light-emitting diodes (LEDs). In this letter, we report on greenish yellow Li-?-SiAlON:Eu2+ phosphors, and use them to create daylight when coupled to an InGaN blue LED chip (460nm ). The newly discovered Li -?-SiAlON:Eu2+ phosphors emit at shorter wavelengths of 573-577nm under the 460nm excitation, and exhibit a smaller Stokes shift than Ca -?-SiAlON:Eu2+ does. By using this short-wavelength yellow oxynitride phosphor, bright daylight emissions from white LEDs can be generated. Thus, highly efficient white LEDs with tunable white light can be fabricated with ?-SiAlON :Eu2+ phosphors, enabling them for a wider range of applications.

Xie, Rong-Jun; Hirosaki, Naoto; Mitomo, Mamoru; Takahashi, Kosei; Sakuma, Ken

2006-03-01

372

Continuous-wave, short-wavelength infrared mixer using dispersion-stabilized highly-nonlinear fiber.  

PubMed

A new type of highly nonlinear fiber (HNLF) was designed and fabricated. The new HNLF was engineered to reduce dispersion shift due to transverse fluctuations while maintaining the modal confinement superior to that of the conventional fibers. The new design strategy was validated by the measurements of the global and local dispersive characteristics under considerable core and index profile deformation induced by tensile stress, which indicated that the dispersive and phase matching characteristics of the fiber did not change even under the highest tensile stress. The characteristics effectively decoupled tension-based Brillouin suppression from phase-matching impairments in parametric mixers for the first time. The new HNLF was used to demonstrate the first coherence-preserving mixer operating in the short-wavelength infrared (SWIR) band. The SWIR mixer was driven by continuous-wave near-infrared (NIR) pump and did not require pump phase dithering to suppress Brillouin scattering. PMID:23038393

Kuo, Bill P-P; Hirano, Masaaki; Radic, Stojan

2012-07-30

373

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

374

Epithermal Neutron Source for Neutron Resonance Spectroscopy (NRS) using High Intensity, Short Pulse Lasers  

SciTech Connect

A neutron source for neutron resonance spectroscopy (NRS) has been developed using high intensity, short pulse lasers. This measurement technique will allow for robust measurements of interior ion temperature of laser-shocked materials and provide insight into equation of state (EOS) measurements. The neutron generation technique uses protons accelerated by lasers off of Cu foils to create neutrons in LiF, through (p,n) reactions with {sup 7}Li and {sup 19}F. The distribution of the incident proton beam has been diagnosed using radiochromic film (RCF). This distribution is used as the input for a (p,n) neturon prediction code which is compared to experimentally measured neutron yields. From this calculation, a total fluence of 1.8 x 10{sup 9} neutrons is infered, which is shown to be a reasonable amount for NRS temperature measurement.

Higginson, D P; McNaney, J M; Swift, D C; Bartal, T; Hey, D S; Pape, S L; Mackinnon, A; Mariscal, D; Nakamura, H; Nakanii, N; Beg, F N

2010-04-22

375

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

376

High-sensitivity receiver for infrared laser communications.  

NASA Technical Reports Server (NTRS)

Description of a high-sensitivity wide-bandwidth 10.6-micron heterodyne receiver for space and ground operational use. The receiver includes a cooled HgCdTe infrared mixer diode, a conical scanner for spatial tracking, an acquisition channel for spatial search and station alignment, and an automatic frequency-control channel to maintain a fixed laser frequency offset. The infrared mixer is designed to provide nearly quantum-noise-limited operation over an extended range of mixer temperature, bias voltage, and intermediate frequency. The resultant experimental receiver has a measured noise equivalent power of less than 10 to the minus 19th W/Hz over the 15- to 40-MHz i.f. band for mixer temperatures from 85 to 115 K, and less than 2 x 10 to the minus 19th W/Hz up to 140 K. Mixer 3-dB cutoff frequencies as high as 420 MHz were measured at a mixer temperature of 125 K. An analysis and engineering equations are given for receiver noise components, noise equivalent power, available mixer conversion gain, mixer transducer gain, and quantum-noise factor in terms of such factors as mixer parameters, quantum efficiency, mixer temperature, dynamic conductance, bias voltage, local oscillator power, and i.f. amplifier characteristics.

Peyton, B. J.; Dinardo, A. J.; Kanischak, G. M.; Lange, R. A.; Sard, E. W.; Arams, F. R.

1972-01-01

377

New Prospects for High Performance SONAR, Chemical Sensor, and Communication Device Materials  

Microsoft Academic Search

Perovskite oxides are a special group of materials, which exhibit many interesting properties, such as ferroelectricity, ferromagnetism, superconductivity, and high dielectric constant. Their unique physical properties lead to a variety of technological applications. Using quantum-mechanical simulations, we have computationally investigated several perovskite materials for use in Naval SONAR, chemical sensor and communications devices. We elucidate the influence of the constituent

Tingting Qi; S. V. Levchenko; J. W. Bennett; I. Grinberg; A. M. Rappe

2009-01-01

378

A High-Efficiency Monte Carlo Receiver for Digital Communications Department of Electrical and Computer Engineering  

E-print Network

A High-Efficiency Monte Carlo Receiver for Digital Communications Zhi Tian Department of Electrical applications. It uses Monte Carlo simulations to perform Bayesian inference of a proba- bilistically modeled results. The Monte Carlo concept is attractive in that it is intuitive, optimal, and works for generic

Tian, Zhi "Gerry"

379

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.

380

Java Objects Communication on a High Performance Network Luc Courtrai, Yves Maheo, Frederic Raimbault  

E-print Network

the marshalling process and the pure communication on a standard (¢¤£¦¥¨§© Ethernet) network and on a high-speed efficiently the commu- nication of objects to really take advantage of the network speed. The paper presents Virtual Machine so that fast transfers of graphs of objects can be achieved. Experimental results

Paris-Sud XI, Université de

381

InfoMall: An Innovative Strategy for High-Performance Computing and Communications Applications Development.  

ERIC Educational Resources Information Center

Describes the InfoMall, a program led by the Northeast Parallel Architectures Center (NPAC) at Syracuse University (New York). The InfoMall features a partnership of approximately 24 organizations offering linked programs in High Performance Computing and Communications (HPCC) technology integration, software development, marketing, education and

Mills, Kim; Fox, Geoffrey

1994-01-01

382

Conflicts and Communication between High-Achieving Chinese American Adolescents and Their Parents  

ERIC Educational Resources Information Center

Drawing on in-depth interview data collected on 18 high-achieving Chinese American students, the authors examine domains of acculturation-based conflicts, parent and child internal conflicts, and conflict resolution in their families. Their analyses show that well-established negative communication patterns in educational expectations, divergent

Qin, Desiree Baolian; Chang, Tzu-Fen; Han, Eun-Jin; Chee, Grace

2012-01-01

383

Supportive Communication and School Outcomes, Part II: Academically "At-Risk" Low Income High School Students.  

ERIC Educational Resources Information Center

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." Finds that parents are major sources of social support for both groups of students; however, at-risk students

Richman, Jack M.; Rosenfeld, Lawrence B.

1999-01-01

384

SHF Cassegrain antenna with electronic beam squint tracking for high data rate mobile satellite communication systems  

Microsoft Academic Search

The design of pointing and tracking systems for vehicular antennas required for a high data rate mobile military satellite communication system is a daunting task because of its demanding requirements. Not only does the antenna have to be satellite pointed accurately towards the satellite as the vehicle moves rapidly and changes orientation, but it must also do so under scintillations

B. Rama Rao; L. P. Callahan; R. J. Davis

1994-01-01

385

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

Microsoft Academic Search

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

Gennady P. Berman; Alan R. Bishop; Dinh C. Nguyen; Boris M. Chernobrod; Vacheslav N. Gorshkov

2009-01-01

386

Local Search Genetic Algorithm for Optimization of Highly Reliable Communications Networks  

E-print Network

Local Search Genetic Algorithm for Optimization of Highly Reliable Communications Networks Berna Turkey berna@rorqual.cc.metu.edu.tr Abstract This paper presents a genetic algorithm (GA. Genetic algorithms (GA) have recently found their way in combinatorial optimization approaches to reliable

Smith, Alice E.

387

Attributes of Communication between Clients and Staff of High Capacity Computer Data Processing Centers.  

ERIC Educational Resources Information Center

A study was conducted in September 1981 of factors which influence the process of communication between clients and staff at six high-capacity computer facilities in the Sacramento, California, metropolitan area. These included two large government organizations, a medium-sized corporation, two bibliographic database settings, and a computer

Hirsch, Kenneth William; Kimbrough, Kenneth Laslie

388

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

389

Enduring Medial Perforant Path Short-Term Synaptic Depression at High Pressure  

PubMed Central

The high pressure neurological syndrome develops during deep-diving (>1.1 MPa) involving impairment of cognitive functions, alteration of synaptic transmission and increased excitability in cortico-hippocampal areas. The medial perforant path (MPP), connecting entorhinal cortex with the hippocampal formation, displays synaptic frequency-dependent-depression (FDD) under normal conditions. Synaptic FDD is essential for specific functions of various neuronal networks. We used rat cortico-hippocampal slices and computer simulations for studying the effects of pressure and its interaction with extracellular Ca2+ ([Ca2+]o) on FDD at the MPP synapses. At atmospheric pressure, high [Ca2+]o (46?mM) saturated single MPP field EPSP (fEPSP) and increased FDD in response to short trains at 50?Hz. High pressure (HP; 10.1 MPa) depressed single fEPSPs by 50%. Increasing [Ca2+]o to 4?mM at HP saturated synaptic response at a subnormal level (only 20% recovery of single fEPSPs), but generated a FDD similar to atmospheric pressure. Mathematical model analysis of the fractions of synaptic resources used by each fEPSP during trains (normalized to their maximum) and the total fraction utilized within a train indicate that HP depresses synaptic activity also by reducing synaptic resources. This data suggest that MPP synapses may be modulated, in addition to depression of single events, by reduction of synaptic resources and then may have the ability to conserve their dynamic properties under different conditions. PMID:21048901

Talpalar, Adolfo E.; Giugliano, Michele; Grossman, Yoram

2010-01-01

390

Overview of the Preliminary Design of the Optical Communication Demonstration and High-Rate Link Facility  

NASA Technical Reports Server (NTRS)

Tlis paper presents an overview of the preliminary design of both the flight and ground systems of the Optical Communication Demonstration and High-Rate Link Facility which will demonstrate optical communication from the International Space Station to ground after its deployment in October 2002. The overview of the preliminary design of the Flight System proceeds by contrasting it with the design of the laboratory-model unit, emphasizing key changes and the rationale behind the design choices. After presenting the preliminary design of the Ground System, the timetable for the construction and deployment of the flight and ground systems is outlined.

Sandusky, John V.; Jeganathan, M.; Ortiz, G.; Biswas, A.; Lee, S.; Parker, G.; Liu, B.; Johnson, D.; DePew, J.; Lesh, J. R.

2000-01-01

391

K-band high power latching switch. [communication satellite system  

NASA Technical Reports Server (NTRS)

A 19 GHz waveguide latching switch with a bandwidth of 1400 MHz and an exceptionally low insertion loss of 0.25 dB was demonstrated. The RF and driver ferrites are separate structures and can be optimized individually. This analysis for each structure is separately detailed. Basically, the RF section features a dual turnstile junction. The circulator consists of a dielectric tube which contains two ferrite rods, and a dielectric spacer separating the ferrite parts along the center of symmetry of the waveguide to form two turnstiles. This subassembly is indexed and locked in the center of symmetry of a uniform junction of three waveguides by the metallic transformers installed in the top and bottom walls of the housing. The switching junction and its actuating circuitry met all RF performance objectives and all shock and vibration requirements with no physical damage or performance degradation. It exceeds thermal requirements by operating over a 100 C temperature range (-44 C to +56 C) and has a high power handling capability allowing up to 100 W of CW input power.

Mlinar, M. J.; Piotrowski, W. S.; Raue, J. E.

1980-01-01

392

[Psychological processes predicting the English communication behavior of Japanese high school students].  

PubMed

This study presents a new model of psychological processes to predict English communication behaviors of Japanese high school students. Various models have been proposed in Japan, based mainly on Canadian models, to predict second-language communication behaviors. This study shows problems with the previous models in Japan and introduces a new model from the perspective of "Expectancy-Value Theory". Questionnaire Survey 1 compared the previous model and the modified models which suggested that a new psychological variable, "Value in English Communication", was necessary to construct the new model. In Survey 2, the new model was further modified by incorporating into it various English learning values which the Japanese have. This study makes a significant contribution to studies and practices of teaching English as a foreign language in Japan. PMID:24505975

Ito, Takehiko

2013-12-01

393

The Use of SS7 and GSM to Support High Density Personal Communications  

Microsoft Academic Search

\\u000a The combination of high user density, high mobility and enhanced network capabilities in Personal Communication Networks (PCN)\\u000a will generate significant network signaling. This paper presents an organized method for quantifying the Signaling System\\u000a Number 7 (SS7) traffic load associated with terminal mobility when the Pan-European standard GSM is used for PCN. We also\\u000a quantify the relative switching cost of PCN

Kathleen S. Meier-Hellstern; Eduardo Alonso; Douglas R. ONeil

394

Video encoder design for high-definition 3D video communication systems  

Microsoft Academic Search

VLSI realization of video compression is the key to real-time high-definition 3D communication systems. The newly established multiview video coding standard, as an extension profile of H.264\\/AVC, draws more and more attention for its high compression ratio and free-viewpoint support. Besides providing the 3D experience, multiview video can also give users complete scene perception. However, the multiple-viewpoint throughput requirement of

Pei-Kuei Tsung; Li-Fu Ding; Wei-Yin Chen; Tzu-Der Chuang; Yu-Han Chen; Pai-Heng Hsiao; Shao-Yi Chien; Liang-Gee Chen

2010-01-01

395

Trigeminal high-frequency stimulation produces short- and long-term modification of reflex blink gain.  

PubMed

Reflex blinks provide a model system for investigating motor learning in normal and pathological states. We investigated whether high-frequency stimulation (HFS) of the supraorbital branch of the trigeminal nerve before the R2 blink component (HFS-B) decreases reflex blink gain in alert rats. As with humans (Mao JB, Evinger C. J Neurosci 21: RC151, 2001), HFS-B significantly reduced blink size in the first hour after treatment for rats. Repeated days of HFS-B treatment produced long-term depression of blink circuits. Blink gain decreased exponentially across days, indicating a long-term depression of blink circuits. Additionally, the HFS-B protocol became more effective at depressing blink amplitude across days of treatment. This depression was not habituation, because neither long- nor short-term blink changes occurred when HFS was presented after the R2. To investigate whether gain modifications produced by HFS-B involved cerebellar networks, we trained rats in a delay eyelid conditioning paradigm using HFS-B as the unconditioned stimulus and a tone as the conditioned stimulus. As HFS-B depresses blink circuits and delay conditioning enhances blink circuit activity, occlusion should occur if they share neural networks. Rats acquiring robust eyelid conditioning did not exhibit decreases in blink gain, whereas rats developing low levels of eyelid conditioning exhibited weak, short-term reductions in blink gain. These results suggested that delay eyelid conditioning and long-term HFS-B utilize some of the same cerebellar circuits. The ability of repeated HFS-B treatment to depress trigeminal blink circuit activity long term implied that it may be a useful protocol to reduce hyperexcitable blink circuits that underlie diseases like benign essential blepharospasm. PMID:24285868

Ryan, Michael; Kaminer, Jaime; Enmore, Patricia; Evinger, Craig

2014-02-01

396

http://www.biotaneotropica.org.br/v8n4/pt/abstract?short-communication+bn01708042008 http://www.biotaneotropica.org.br Biota Neotrop., vol. 8, no. 4, Out./Dez. 2008  

E-print Network

.R. & SIM?ES-LOPES, P.C. 2008. Notes on the distribution, group size and behavior of the bottlenose dolphin behavior repertoire. Keywords: bottlenose dolphin, Tursiops truncatus, behavior, group size, seabirds/abstract?short-communication+bn01708042008. Abstract: The ecology of the bottlenose dolphin (Tursiops truncatus) is scarcely documented

Simões-Lopes, Paulo César

397

A High Speed Quantum Communication Testbed Carl J. Williams, Xiao Tang, Mikko Hiekkero, Julie Rouzaud, Richang Lu, Andreas Goedecke,  

E-print Network

A High Speed Quantum Communication Testbed Carl J. Williams, Xiao Tang, Mikko Hiekkero, Julie communications, gigabit ethernet 1. INTRODUCTION Quantum key distribution (QKD) has progressed rapidly since Advanced Research Project Agency (DARPA) has thus undertaken an effort to build a high-speed quantum

398

Nitrogen plasma ion implantation in silicon using short pulse high voltage glow discharges  

NASA Astrophysics Data System (ADS)

A high voltage (HV) pulse generator based on Blumlein technology was used to implant nitrogen ions into silicon substrates by immersion in a plasma generated by the HV pulse itself. Working pressures, applied HVs and treatment times were varied. Elemental depth profiles determined by Auger electron spectroscopy showed deeper penetration for higher voltages and broader profiles for increased treatment times indicating higher diffusion, as expected. Penetration depths, however, were about half of the values calculated by the SRIM code, probably due to the short duration of the HV pulse. The high-resolution x-ray diffraction ?/2? scans measured around the (0 0 4) Si Bragg reflection of implanted samples had shoulders in the lower ? side, indicating a lattice expansion in the direction normal to the surface. Dynamical diffraction theory of Takagi-Taupin was used to fit the measured spectra, thus finding the strain profiles in the implanted samples. Both maximum strain values and integrated strains increased for samples implanted with higher voltages and treatment times and were almost independent of pressure.

Tan, I. H.; Ueda, M.; Rossi, J. O.; Diaz, B.; Abramof, E.; Reuther, H.

2007-09-01

399

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

400

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

401

Short-time creep and rupture tests on high burnup fuel rod cladding  

NASA Astrophysics Data System (ADS)

Short-time creep and rupture tests were performed to assess the strain potential of cladding of high burnup fuel rods under conditions of dry storage. The tests comprised optimized Zry-4 cladding samples from fuel rods irradiated to burnups of up to 64 MWd/kg U and were carried out at temperatures of 573 and 643 K and at hoop stresses of about 400 and 600 MPa. The applied stresses were chosen to reach about 2% strain within an envisaged testing time of 3-4 days. The tests were followed by a low temperature phase at 423 K and 100 MPa to assess the long-term behaviour of the cladding ductility especially with regard to the higher hydrogen content in the cladding of the high burnup fuel. These tests showed that around 600 K, a uniform plastic strain of at least 2% is reached without cladding failure. The low temperature phase at 423 K for up to 5 days revealed no cladding failure under these conditions of reduced cladding ductility due to the increased hydrogen content.

Goll, W.; Spilker, H.; Toscano, E. H.

2001-03-01

402

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

NASA Astrophysics Data System (ADS)

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.

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

2013-01-01

403

High-efficiency short daily haemodialysismorbidity and mortality rate in a long-term study  

Microsoft Academic Search

Background. In conventional haemodialysis (CHD), the morbidity and mortality rate is unacceptably high; consequently, variations in the length and frequency of the haemodialysis sessions have been studied to reduce the complications of dialysis treatment. In this sense, high-efficiency short daily haemodialysis (SDHD) has been proposed as an alternative for patients on renal replacement therapy. In this study, we have related

Manuel Carlos Martins Castro; Claudio Luders; Rosilene Motta Elias; Hugo Abensur; Joao Egidio; Romao Junior

2006-01-01

404

Signatures of the Unruh effect via high-power, short-pulse lasers  

NASA Astrophysics Data System (ADS)

The ultra-high fields of high-power short-pulse lasers are expected to contribute to understanding fundamental properties of the quantum vacuum and quantum theory in very strong fields. For example, the neutral QED vacuum breaks down at the Schwinger field strength of 1.31018 V/m, where a virtual e+e- pair gains its rest mass energy over a Compton wavelength and materializes as a real pair. At such an ultra-high field strength, an electron experiences an acceleration of aS=21028g and hence fundamental phenomena such as the long predicted Unruh effect start to play a role. The Unruh effect implies that the accelerated electron experiences the vacuum as a thermal bath with the Unruh temperature. In its accelerated frame the electron scatters photons off the thermal bath, corresponding to the emission of an entangled pair of photons in the laboratory frame. While it remains an experimental challenge to reach the critical Schwinger field strength within the immediate future even in view of the enormous thrust in high-power laser developments in recent years, the near-future laser technology may allow to probe the signatures of the Unruh effect mentioned above. Using a laser-accelerated electron beam (?300) and a counter-propagating laser beam acting as optical undulator should allow to create entangled Unruh photon pairs (i.e., signatures of the Unruh effect) with energies of the order of several hundred keV. An even substantially improved experimental scenario can be realized by using a brilliant 20 keV photon beam as X-ray undulator together with a low-energy (??2) electron beam. In this case the separation of the Unruh photon pairs from background originating from linearly accelerated electrons (classical Larmor radiation) is significantly improved. Detection of the Unruh photons may be envisaged by Compton polarimetry in a 2D-segmented position-sensitive germanium detector.

Thirolf, P. G.; Habs, D.; Henig, A.; Jung, D.; Kiefer, D.; Lang, C.; Schreiber, J.; Maia, C.; Schaller, G.; Schtzhold, R.; Tajima, T.

2009-11-01

405

Dimming-discrete-multi-tone (DMT) for simultaneous color control and high speed visible light communication.  

PubMed

Visible light communication (VLC) using LEDs has attracted significant attention recently for the future secure, license-free and electromagnetic-interference (EMI)-free optical wireless communication. Dimming technique in LED lamp is advantageous for energy efficiency. Color control can be performed in the red-green-blue (RGB) LEDs by using dimming technique. It is highly desirable to employ dimming technique to provide simultaneous color and dimming control and high speed VLC. Here, we proposed and demonstrated a LED dimming control using dimming-discrete-multi-tone (DMT) modulation. High speed DMT-based VLC with simultaneous color and dimming control is demonstrated for the first time to the best of our knowledge. Demonstration and analyses for several modulation conditions and transmission distances are performed, for instance, demonstrating the data rate of 103.5 Mb/s (using RGB LED) with fast Fourier transform (FFT) size of 512. PMID:24718127

Sung, Jiun-Yu; Chow, Chi-Wai; Yeh, Chien-Hung

2014-04-01

406

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

407

High-order statistical equalizer for nonlinearity compensation in dispersion-managed coherent optical communications.  

PubMed

Fiber nonlinearity has become a major limiting factor to realize ultra-high-speed optical communications. We propose a fractionally-spaced equalizer which exploits a trained high-order statistics to deal with data-pattern dependent nonlinear impairments in fiber-optic communications. The computer simulation reveals that the proposed 3-tap equalizer improves Q-factor by more than 2 dB for long-haul transmissions of 5,230 km distance and 40 Gbps data rate. We also demonstrate that the joint use of a digital backpropagation (DBP) and the proposed equalizer offers an additional 1-2 dB performance improvement due to the channel shortening gain. A performance in high-speed transmissions of 100 Gbps and beyond is evaluated as well. PMID:22772267

Koike-Akino, Toshiaki; Duan, Chunjie; Parsons, Kieran; Kojima, Keisuke; Yoshida, Tsuyoshi; Sugihara, Takashi; Mizuochi, Takashi

2012-07-01

408

The Lunar Laser Communication Demonstration: NASA's First Step Toward Very High Data Rate Support of Science and Exploration Missions  

NASA Astrophysics Data System (ADS)

Future NASA missions for both Science and Exploration will have needs for much higher data rates than are presently available, even with NASA's highly-capable Space- and Deep-Space Networks. As a first step towards this end, for one month in late 2013, NASA's Lunar Laser Communication Demonstration (LLCD) successfully demonstrated for the first time high-rate duplex laser communications between a satellite in lunar orbit, the Lunar Atmosphere and Dust Environment Explorer (LADEE), and multiple ground stations on the Earth. It constituted the longest-range laser communication link ever built and demonstrated the highest communication data rates ever achieved to or from the Moon.

Boroson, Don M.; Robinson, Bryan S.

2014-12-01

409

Short communication The geometry of the Iapetus Suture Zone in central Ireland deduced from a magnetotelluric study  

Microsoft Academic Search

The crustal geometry of the Iapetus Suture Zone (ISZ) in central Ireland is inferred from an electrical resistivity model derived from broadband and long period magnetotelluric measurements along a 200-km-long NNW-SSE profile. The model highlights an undulating high conductivity layer of thickness 10-15 km and resistivity 2-5 m, at middle to lower crustal depths interpreted as sulphide-bearing graphitic sediments deposited

C. K. Rao; Alan G. Jones; Max Moorkamp

410

Short Communication Tomato yellow leaf curl Sardinia virus can overcome transgene-mediated RNA silencing of two essential viral genes  

Microsoft Academic Search

To evaluate RNA silencing for the control of geminivirus infection, two classes of post-transcriptionally silenced (PTS) plants were tested using Tomato yellow leaf curl Sardiniavirus(TYLCSV)Rep-210-transgenic plants,asense6antisensehybridandtwomulticopy sense lines. In both classes, PTS plants accumulated low or undetectable amounts of Rep-210 protein and mRNA but high amounts of Rep-210 small interfering RNAs. PTS plants were susceptible to TYLCSV when challenged by

Emanuela Noris; Alessandra Lucioli; Raffaela Tavazza; Piero Caciagli; Gian Paolo Accotto; Mario Tavazza

411

The initial freezing point temperature of beef rises with the rise in pH: a short communication.  

PubMed

This study tested the hypothesis that the initial freezing point temperature of meat is affected by pH. Sixty four bovine M. longissimus thoracis et lumborum were classified into two ultimate pH groups: low (<5.8) and high pH (>6.2) and their cooling and freezing point temperatures were determined. The initial freezing temperatures for beef ranged from -0.9 to -1.5C (?=0.6C) with the higher and lower temperatures associated with high and low ultimate pH respectively. There was a significant correlation (r=+0.73, P<0.01) between beef pH and freezing point temperature in the present study. The outcome of this study has implications for the meat industry where evidence of freezing (ice formation) in a shipment as a result of high pH meat could result in a container load of valuable chilled product being downgraded to a lower value frozen product. PMID:23410892

Farouk, M M; Kemp, R M; Cartwright, S; North, M

2013-05-01

412

Short communication: 3-Phenyllactic acid production in milk by Pediococcus pentosaceus SK25 during laboratory fermentation process.  

PubMed

3-Phenyllactic acid (PLA) is a broad-spectrum antimicrobial compound, produced by a wide range of lactic acid bacteria. A novel lactic acid bacteria strain with high PLA-producing ability, Pediococcus pentosaceus SK25, was isolated from traditional Chinese pickles. When grown in de Man, Rogosa, Sharpe broth at 30C for 36h, this strain produced 135.6mg/L of PLA. Using this strain as starter for milk fermentation, 47.2mg/L of PLA was produced after fermentation for 12h. The PLA production was significantly improved by phenylalanine supplement, but was completely inhibited by tyrosine supplement. PMID:25434344

Yu, Shuhuai; Zhou, Chen; Zhang, Tao; Jiang, Bo; Mu, Wanmeng

2015-02-01

413

The High-Performance Computing and Communications program, the national information infrastructure and health care.  

PubMed

The High-Performance Computing and Communications (HPCC) program is a multiagency federal effort to advance the state of computing and communications and to provide the technologic platform on which the National Information Infrastructure (NII) can be built. The HPCC program supports the development of high-speed computers, high-speed telecommunications, related software and algorithms, education and training, and information infrastructure technology and applications. The vision of the NII is to extend access to high-performance computing and communications to virtually every U.S. citizen so that the technology can be used to improve the civil infrastructure, lifelong learning, energy management, health care, etc. Development of the NII will require resolution of complex economic and social issues, including information privacy. Health-related applications supported under the HPCC program and NII initiatives include connection of health care institutions to the Internet; enhanced access to gene sequence data; the "Visible Human" Project; and test-bed projects in telemedicine, electronic patient records, shared informatics tool development, and image systems. PMID:7614116

Lindberg, D A; Humphreys, B L

1995-01-01

414

Isolation and analysis of tetracycline-resistant Mycoplasma agalactiae strains from an infected goat herd in Cyprus - short communication.  

PubMed

A major concern with the use of tetracycline against mycoplasmas is the development of resistance. Infections in small ruminants due to tetracyclineresistant Mycoplasma agalactiae strains are becoming a frequent problem worldwide. In the present paper the detection and analysis of three tetracycline-resistant M. agalactiae strains, isolated from infected goats in Cyprus, are reported. The three field isolates were identified as M. agalactiae by polymerase chain reaction (PCR) showing 98% identity to the M. agalactiae PG2 reference strain. Furthermore, they were found sensitive to tylosin, enrofloxacin, spiramycin and lincomycin. In contrast, they were resistant to tetracycline. None of the putative genes [tet(M), tet(O) and tet(S)] that commonly contribute to high-level resistance to tetracycline could be amplified from their genome. Contrarily, the field isolates were found to carry ISMag1, an insertion sequence related to the IS30 family of mobile elements. Although ISMag1 is widely believed to induce high-frequency chromosomal rearrangements resulting in phenotypic changes of microorganisms, its potential role in tetracycline resistance of mycoplasmas requires further studies. PMID:23921341

Filioussis, George; Ioannou, Ioannis; Petridou, Evanthia; Avraam, Maria; Giadinis, Nektarios D; Kritas, Spyridon K

2013-09-01

415

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

416

Analysis of electromagnetic field emitted from home plug power line used for indoor high-speed broadband communication  

Microsoft Academic Search

High-speed broadband power line communication (BPL) is a novel and practicable technique for Net-atHome or home area local\\u000a area networking (LAN). Because of the characteristics of BPL, the electromagnetic wave emitted from the BPL transmission media\\u000a will influence the indoor electromagnetic environment, which would also affect the performance of other wireless communications.\\u000a Based on the analysis of the communication channel

Yong Xu; Yinghua Lv; Biao Yang; Hongxin Zhang

2009-01-01

417

High speed ultra short pulse fiber ring laser using photonic crystal fiber nonlinear optical loop mirror  

NASA Astrophysics Data System (ADS)

A scheme to generate high speed optical pulse train with ultra short pulse width is proposed and experimentally studied. Two-step compression is used in the scheme: 20 GHz and 40 GHz pulse trains generated from a rational harmonic actively mode-locked fiber ring laser is compressed to a full width at half-maximum (FWHM) of ~ 1.5 ps using adiabatic soliton compression with dispersion shifted fibers (DSF). The pulse trains then undergo a pedestal removal process by transmission through a cascaded two photonic crystal fiber (PCF)-nonlinear optical loop mirrors (NOLM) realized using a double-ring structure. The shortest output pulse width obtained was ~ 610 fs for 20 GHz pulse train and ~ 570 fs for 40 GHz pulse train. The signal to noise ratio of the RF spectrum of the output pulse train is larger than 30 dB. Theoretical simulation of the NOLM transmission is conducted using split-step Fourier method. The results show that two cascaded NOLMs can improve the compression result compared to that for a single NOLM transmission.

Ma, Shaozhen; Li, Wenbo; Hu, Hongyu; Dutta, Niloy K.

2012-06-01

418

Impact of Mascarene High variability on the East African `short rains'  

NASA Astrophysics Data System (ADS)

The interannual variability of East African `short rains' (EASR) and its link with the Mascarene High (MH) variation are explored, using observations and reanalysis data. Correlation and composite analyses for flood and drought events reveal that the EASR variability is strongly linked to the MH zonal displacement, in particular, the zonal movement of the MH eastern ridge. When the MH eastern ridge is anomalously displaced to the west (east) of its normal position, the south east (SE) trade winds over the South Indian Ocean (SIO) anomalously strengthen (weaken). This enhances (reduces) the relatively cool and dry SE trade winds and induces cold (warm) sea surface temperature anomaly in the SIO. As a result, convection over the western equatorial SIO is suppressed (enhanced) and leads to rainfall deficits (excess) over East Africa. Droughts in East Africa are associated with a westward migration of the MH eastern ridge, while the relationship is less clear for flood events and their link to an eastward migration of the MH. Therefore, the zonal migration of the MH eastern ridge provides a novel indicator for the EASR extremes especially droughts. This revelation has immense social application for rainfall forecast over East Africa where rainfall deficits have become more prevalent against the background of deteriorating conventional forecasts for EASR droughts.

Manatsa, Desmond; Morioka, Yushi; Behera, Swadhin K.; Matarira, Caxston H.; Yamagata, Toshio

2014-03-01

419

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

420

Short-term nanostructural effects of high radiofrequency treatment on the skin tissues of rabbits.  

PubMed

The aim of this study is to quantitatively investigate the short-term effects of RF tissue-tightening treatment in in vivo rabbit dermal collagen fibrils. These effects were measured at different energy levels and at varying pass procedures on the nanostructural response level using histology and AFM analysis. Each rabbit was divided into one of seven experimental groups, which included the following: control group, and six RF group according to RF energy (20W and 40W) and three RF pass procedures. The progressive changes in the diameter and D-periodicity of rabbit dermal collagen fibrils were investigated in detail over a 7-day post-treatment period. The dermal tissues treated with the RF tissue-tightening device showed more prominent inflammatory responses with inflammatory cell ingrowth compared to the control. This effect showed more prominent with the passage of day after treatment. Although an increase in the diameter and D-periodicity of dermal collagen fibrils was identified immediately after the RF treatment, a decrease in the morphology of dermal collagen fibrils continued until post-operative day 7. Furthermore, RF treatment led to the loss of distinct borders. Increases in RF energy with the same pass procedure, as well as an increase in the number of RF passes, increased the occurrence of irreversible collagen fibril injury. A multiple-pass treatment at low energy rather than a single-pass treatment at high energy showed a large amount of collagen fibrils contraction at the nanostructural level. PMID:22037867

Choi, Samjin; Cheong, Youjin; Shin, Jae-Ho; Lee, Hui-Jae; Lee, Gi-Ja; Choi, Seok Keun; Jin, Kyung-Hyun; Park, Hun-Kuk

2012-09-01

421

Short communication: calf body temperature following chemical disbudding with sedation: effects of milk allowance and supplemental heat.  

PubMed

The use of caustic paste combined with a sedative is one of the least painful methods for disbudding. It is recommended to disbud at as early as 5d of age. However, the sedative xylazine reportedly causes a decrease in core temperature. Furthermore, young calves do not thermoregulate efficiently. We investigated the effects of disbudding calves at 5d of age using caustic paste and xylazine sedation on body temperature, activity, and milk intake of 46 individually housed 5-d-old calves in a 22 factorial design, with milk fed at 4.5L/d (low-fed calves) versus 9L/d (high-fed calves), with or without a heat lamp. Body temperature, calf activity (standing time), and barn temperature were monitored continuously using automatic data loggers on the day of, before the day of, and the day after disbudding. All calves were injected intramuscularly with 0.25mL of 2mg/mL xylazine 20min before disbudding (dose: 0.120.003mL/kg of BW). We found that the body temperature of 5-d-old calves decreased immediately after the injection of the sedative xylazine. The body temperature of calves decreased 0.90.09C and it took 3.80.32h to climb back to the preinjection body temperature. Calves that were fed the lower amount of milk, received a higher dose of xylazine (mL/kg BW), or were disbudded in a colder environment were more affected by body temperature variations (lower and longest decrease in body temperature and higher magnitude). Calf activity recovery followed the pattern of body temperature recovery. Milk allowance and supplemental heat did not help enhance recovery during the 6h following the procedure. The disbudding procedure did not affect milk intake but calves with less body temperature decrease or kept in a warmer environment drank more milk following disbudding. Low-fed calves were overall more affected by the procedure than high-fed calves during the disbudding day and the following day (greater decrease in body temperature and drank less in the colder environment). Providing a high-milk diet is a suitable option to help mitigate calf discomfort due to the disbudding procedure, whereas using a heat lamp does not seem to help, at least in a mildly cold winter. PMID:24913644

Vasseur, E; Rushen, J; de Passill, A M

2014-08-01

422

Short communication: An assessment of the use of malaria rapid tests by village health volunteers in rural Laos.  

PubMed

Rapid malaria diagnosis, a key component of malaria control strategies, is hampered by the expense and training requirements of reliable microscopy. Rapid malaria antigen tests may improve the diagnosis of malaria in the rural tropics. After 1 h training 64 village health volunteers (VHVs) from rural Laos, with no previous laboratory experience, performed two malaria rapid diagnostic tests (ParacheckPf and OptiMAL) accurately. The reliability of six VHVs was assessed longitudinally, over 10 months with different frequencies of retraining. Compared with microscopy, error rates in dipstick interpretation were low (<2%) for both tests and were not associated with retraining frequency (P>0.2). Previously untrained Lao VHVs performed malaria rapid tests reliably with high sensitivity and specificity after minimal training. PMID:14996360

Mayxay, Mayfong; Newton, Paul N; Yeung, Shunmay; Pongvongsa, Tiengkham; Phompida, Samlane; Phetsouvanh, Rattanaxay; White, Nicholas J

2004-03-01

423

Short Communication: Transmitted Drug Resistance and Molecular Epidemiology in Antiretroviral Naive HIV Type 1-Infected Patients in Rhode Island  

PubMed Central

Abstract Transmission of HIV-1 drug resistance has important clinical and epidemiological consequences including earlier treatment failure and forward transmission of resistance strains in high-risk groups. To evaluate the prevalence and molecular epidemiology of transmitted drug resistance in Rhode Island, we collected genotypic, demographic, clinical, and laboratory data from treatment-naive individuals presenting to the largest outpatient HIV clinic in the state from January 2007 to November 2007. Sequences from 35 treatment-naive individuals were available, 83% of whom were men who had sex with men (MSM). All sequences were HIV-1 subtype B. Drug resistance mutations were identified in 7/35 [20%; 95% confidence interval (CI), 0.080.37] patients, six of whom had K103N. Two phylogenetic transmission clusters were found, involving 17% (6/35) of individuals, three in each cluster. We did not find an association between belonging to a cluster and age, gender, AIDS-defining illness, CD4 cell count, or viral load. Drug resistance mutations were more commonly observed in transmission clusters (p?=?0.08). Individuals in one cluster all had K103N and were MSM who had attended local bathhouses. Individuals forming clusters were significantly more likely to have visited a bathhouse compared to nonclusters (p?=?0.02). The prevalence of transmitted drug resistance in Rhode Island is high, further justifying genotypic testing on presentation to care and prior to treatment initiation. Molecular epidemiological analysis and association of resistance with phylogenetic networks using data obtained for clinical purposes may serve as useful tools for the prevention of drug resistance transmission and for contact tracing. PMID:20954831

Tashima, Karen; Cartwright, Charles P.; Gillani, Fizza S.; Mintz, Orli; Zeller, Kimberly; Kantor, Rami

2011-01-01

424

A high-average-power tapered FEL amplifier at submillimeter frequencies using sheet electron beams and short-period wigglers  

Microsoft Academic Search

A high-average-power FEL amplifier operating at submillimeter frequencies is under development at the University of Maryland. Program goals are to produce a cw, ~1 MW, FEL amplifier source at frequencies between 280 and 560 GHz. To this end, a high-gain, high-efficiency, tapered FEL amplifier using a sheet electron beam and a short-period (superconducting) wiggler has been chosen. Development of this

S. W. Bidwell; D. J. Radack; T. M. Antonsen; J. H. Booske; Y. Carmel; W. W. Destler; V. L. Granatstein; B. Levush; P. E. Latham; I. D. Mayergoyz; Z. X. Zhang

1991-01-01

425

ICPP: Relativistic Plasma Physics with Ultra-Short High-Intensity Laser Pulses  

NASA Astrophysics Data System (ADS)

Recent progress in generating ultra-short high-intensity laser pulses has opened a new branch of relativistic plasma physics, which is discussed in this talk in terms of particle-in-cell (PIC) simulations. These pulses create small plasma volumes of high-density plasma with plasma fields above 10^12 V/m and 10^8 Gauss. At intensities beyond 10^18 W/cm^2, now available from table-top systems, they drive relativistic electron currents in self-focussing plasma channels. These currents are close to the Alfven limit and allow to study relativistic current filamentation. A most remarkable feature is the generation of well collimated relativistic electron beams emerging from the channels with energies up to GeV. In dense matter they trigger cascades of gamma-rays, e^+e^- pairs, and a host of nuclear and particle processes. One of the applications may be fast ignition of compressed inertial fusion targets. Above 10^23 W/cm^2, expected to be achieved in the future, solid-density matter becomes relativistically transparent for optical light, and the acceleration of protons to multi-GeV energies is predicted in plasma layers less than 1 mm thick. These results open completely new perspectives for plasma-based accelerator schemes. Three-dimensional PIC simulations turn out to be the superior tool to explore the relativistic plasma kinetics at such intensities. Results obtained with the VLPL code [1] are presented. Different mechanisms of particle acceleration are discussed. Both laser wakefield and direct laser acceleration in plasma channels (by a mechanism similar to inverse free electron lasers) have been identified. The latter describes recent MPQ experimental results. [1] A. Pukhov, J. Plasma Physics 61, 425 - 433 (1999): Three-dimensional electromagnetic relativistic particle-in-cell code VLPL (Virtual Laser Plasma Laboratory).

Meyer-Ter-Vehn, Juergen

2000-10-01

426

Short time interval for condensation of high-temperature silicates in the solar accretion disk.  

PubMed

Chondritic meteorites are made of primitive components that record the first steps of formation of solids in our Solar System. Chondrules are the major component of chondrites, yet little is known about their formation mechanisms and history within the solar protoplanetary disk (SPD). We use the reconstructed concentrations of short-lived (26)Al in chondrules to constrain the timing of formation of their precursors in the SPD. High-precision bulk magnesium isotopic measurements of 14 chondrules from the Allende chondrite define a (26)Al isochron with (26)Al/(27)Al = 1.2(0.2) 10(-5) for this subset of Allende chondrules. This can be considered to be the minimum bulk chondrule (26)Al isochron because all chondrules analyzed so far with high precision (?50 chondrules from CV and ordinary chondrites) have an inferred minimum bulk initial ((26)Al/(27)Al) ? 1.2 10(-5). In addition, mineral (26)Al isochrons determined on the same chondrules show that their formation (i.e., fusion of their precursors by energetic events) took place from 0 Myr to ?2 Myr after the formation of their precursors, thus showing in some cases a clear decoupling in time between the two events. The finding of a minimum bulk chondrule (26)Al isochron is used to constrain the astrophysical settings for chondrule formation. Either the temperature of the condensation zone dropped below the condensation temperature of chondrule precursors at ?1.5 My after the start of the Solar System or the transport of precursors from the condensation zone to potential storage sites stopped after 1.5 My, possibly due to a drop in the disk accretion rate. PMID:25605942

Luu, Tu-Han; Young, Edward D; Gounelle, Matthieu; Chaussidon, Marc

2015-02-01

427

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

428

Novel frame synchronization of OFDM scheme for high-speed power line communication systems  

Microsoft Academic Search

Frame synchronization is an critical factor for an effective operation of OFDM(orthogonal frequency division multiplexing) schemes. In this paper, we propose and analyze an efficient frame synchronization method based on m-sequence of OFDM format for high-speed power line communication systems. Repeated m-sequence is superimposed directly to OFDM frames in the time domain. By utilizing the autocorrelation characteristics of m-sequence, efficient

Young Sun Lim; Jae Sung Park; Jin Young Kim

2008-01-01

429

A space-time coding modem for high-data-rate wireless communications  

Microsoft Academic Search

This paper presents the theory and practice of a new advanced modem technology suitable for high-data-rate wireless communications and presents its performance over a frequency-flat Rayleigh fading channel. The new technology is based on space-time coded modulation (STCM) with multiple transmit and\\/or multiple receive antennas and orthogonal pilot sequence insertion (O-PSI). In this approach, data is encoded by a space-time

Ayman F. Naguib; Vahid Tarokh; Nambirajan Seshadri; A. Robert Calderbank

1998-01-01

430

Design and Implementation of Ethernet\\/High-speed Power Line Communication Bridge Supporting QoS  

Microsoft Academic Search

The QoS support is very important for the future home network services. Since home network is mixed with various types of networks, it is required to support QoS even when traffics flow over non-QoS network like Ethernet. We design and implement a bridge system providing QoS which connects non-QoS and QoS networks, more specifically Ethernet and high-speed power line communication

Kwangil Lee; Junhee Park; Kyeongdeok Moon

2007-01-01

431

Monolithic 40GHz Mode-Locked MQW DBR Lasers for High-Speed Optical Communication Systems  

Microsoft Academic Search

The state-of-the-art of the development and fabrication of advanced 1.55-mum\\/40-GHz pulse laser modules with a monolithic InP-based mode-locked distributed Bragg reflector (DBR) MQW laser chip inside is reported, with respect to the future applications in high-speed optical communications. We emphasize the latest improvements for hybrid mode-locked devices, which integrate a saturable absorber or an electroabsorption modulator. We further illustrate different

Ronald Kaiser; B. Huttl

2007-01-01

432

A high data rate electro-optic phase modulator driver for a coherent optical communications application  

Microsoft Academic Search

A compact phase modulator driver circuit capable of high data rates has been designed and integrated with a LiNbO3 electro-optical (EO) crystal for a coherent optical communications system. The modulator driver demonstrated the capability of producing an output signal of 20 V peak-to-peak (p-p) amplitude with a 3 dB bandwidth of 210 MHz. The input signal is 2 V p-p

C. J. Grant; R. O. Mueller; N. Mysoor

1994-01-01

433

X-ray spectral evolution of Her X-1 in a low state and the following short high state  

NASA Astrophysics Data System (ADS)

We analysed spectral variations of ~8.5-d long Rossi X-ray Timing Explorer (RXTE) monitoring observations of Her X-1 in 2001 December. This set of observations enables, for the first time, frequent continuous monitoring (111 pointings in ~8.5 d) of the source with RXTE including a ~1.7-d-long low state part and the following ~6.8-d-long short high state part. We used an absorbed power-law model with an iron line energy complex modelled as a Gaussian to fit both the 3-60 keV Proportional Counter Array-High Energy X-ray Timing Experiment (PCA-HEXTE) overall short high state spectrum and 3-20 keV individual PCA spectra. An additional partial cold absorber model was used for both cases. Using 3-20 keV individual PCA spectra, absorption in anomalous dips (ADs) and pre-eclipse dips (PDs) in the short high state was compared. Decreasing the ratio of unabsorbed to absorbed flux with increasing unabsorbed flux in ADs and PDs was interpreted as evidence of the fact that the regions causing opaque obscuration and soft absorption are not geometrically far away from each other. Higher iron line peak energies in the low state and the short high state (~6.6-6.9 keV) were interpreted as a clue of the presence of iron line components other than the K? emission line.

?nam, S?tk? Ca?da?; Baykal, Altan

2005-08-01

434

Using UDP Datagram to Realize a Distributed Control Mode at High-Speed Data Communication  

NASA Astrophysics Data System (ADS)

This article presents a distributed control mode at high-speed data communication by using UDP datagram based on a dual-port RAM, with the purpose of exploring an efficient, low CPU occupancy, high-speed, reliable and large amounts of data exchange mode. One port of the proposed dual-port RAM mode is connected to local CPU, which can be easily read and write data and the other port is connected to the reading and writing and communication control dedicated logic, which is responsible for organizing, sending, receiving and analyzing UDP datagram and also for completing the tasks of reading and writing dual-port RAM and sending interrupt request to the local processor. This model not only realizes efficient data exchange, but also provides real-time interrupt response mechanism. In this article, it discusses the functional modules required for these functions, describes the composition of the system and the advantages of technical performance. It also analyzes the feasibility of its development, and demonstrates that this model is an advanced, high performance distributed control communication program with great promising.

Zhao, Lindi

435

Short communication: Prevalence and risk factors for human T cell lymphotropic virus infection in Southern Brazilian HIV-positive patients.  

PubMed

HIV/human T cell lymphotropic virus (HTLV) coinfection has a large range of prevalence in the different risk groups and geographic regions of the world. Most of the HTLV-infected people live in geographic areas where the virus is endemic, as it happens in Brazil. The aim of this study was to identify HTLV prevalence and risk factors in HIV-positive patients. A cross-sectional study was conducted with 580 HIV-positive patients (mean age of 40.6 years and 45.0% men) from a specialized HIV/AIDS diagnosis and treatment center in Southern Brazil. Sociodemographic data, HIV risk factors, and HTLV-1/2 antibodies were collected. HTLV proviral DNA was detected by polymerase chain reaction (PCR). A multivariate analysis was performed to identify risk factors for HTLV infection. HTLV antibodies were detected in 29 (5.0%) and HTLV provirus in 17 (2.9%) patients. HTLV-1 was identified in 11 (64.7%) patients and HTLV-2 in 6 (35.3%) patients. No significant differences were observed between mono and coinfected patients in clinical characteristics regarding HIV/AIDS (time since HIV diagnosis, HIV viral load, lymphocytes CD4(+) count, and use of highly active antiretroviral therapy). Blood transfusion history was significantly associated with HIV/HTLV coinfection (p=0.039). Alcohol abuse was more prevalent in HTLV-positive (47.1%) than in HIV mono-infected patients (20.4%; p=0.008). Tattooing was the only risk factor independently associated with HIV/HTLV coinfection (p=0.035). This information contributes to an understanding of the epidemiology of HIV/HTLV coinfection in Brazil. PMID:24866083

Galetto, Leonardo Ramos; Lunge, Vagner Ricardo; Bria, Jorge Umberto; Tietzmann, Daniela Cardoso; Stein, Airton Tetelbom; Simon, Daniel

2014-09-01

436

Short communication: Maternal heat stress during the dry period alters postnatal whole-body insulin response of calves.  

PubMed

Heat stress during the dry period not only negatively affects a cow's performance but also affects her offspring. Previous studies indicate that calves born to cows heat-stressed during late gestation have lower birth weight but similar overall weight gain during the prepubertal period compared with those cooled in utero. However, it is unclear if whole-body insulin response, and thus metabolism, of calves is altered in their postnatal life after in utero heat stress. The aim of the present study was to examine the effects of maternal heat stress during the dry period on whole-body insulin response of calves after weaning. Calves (10/treatment) were born to cows exposed to heat stress (HT) or cooling (CL) when dry. Calves were immediately separated from their dams and fed 3.8L of high-quality colostrum within 1h after birth and then 1.9L 12h later. All calves were fed 1.9 to 3.8L of pasteurized milk in the morning and afternoon from 2 to 42 d of age and then only in the morning until weaning at 49 d. Calf starter and water were offered ad libitum starting at 2 d of age. All calves were managed in the same manner throughout the study. All calves were subjected to a glucose tolerance test (GTT) and an insulin challenge (IC) at 55 d of age. Calves heat-stressed in utero were born lighter (40 1.4 vs. 45 1.4 kg) compared with CL calves. Both groups of calves had similar weaning weights (HT: 68 3.2 kg; CL: 71 3.3 kg) and body weight gain from birth to weaning (HT: 28 2.2 kg; CL: 26 2.3 kg). Compared with those cooled in utero, HT calves had a similar insulin response to GTT and insulin clearance during IC but faster glucose clearance during GTT and IC. In conclusion, in addition to impaired fetal growth, maternal heat stress during the dry period enhances the whole-body insulin response of calves after weaning, which suggests the possibility of accelerated lipogenesis and fat deposition in early life. PMID:24359830

Tao, S; Monteiro, A P A; Hayen, M J; Dahl, G E

2014-02-01

437

COMMUNICATION Short communication articles are short scientific entities often dealing  

E-print Network

articles Does the use of vaginal-implant transmitters affect neonate survival rate of white-tailed deer deer Odocoileus virginianus? - Wildl. Biol. 14: 272-279. We compared survival of neonate white-tailed capture methods. Therefore, use of VITs to capture neonate white-tailed deer did not influence neonate

438

Energy-efficient wireless communication In this chapter we present an energy-efficient highly adaptive network  

E-print Network

Energy-efficient wireless communication In this chapter we present an energy-efficient highly substantial research in the hardware aspects of mobile communications energy-efficiency, such as low-power electronics, power-down modes, and energy efficient modulation. However, due to fundamental physical

Havinga, Paul J.M.

439

A New Population of High-Redshift Short-Duration Gamma-Ray Bursts  

NASA Astrophysics Data System (ADS)

The redshift distribution of the short-duration gamma-ray bursts (GRBs) is a crucial, but currently fragmentary, clue to the nature of their progenitors. Here we present optical observations of nine short GRBs obtained with Gemini, Magellan, and the Hubble Space Telescope. We detect the afterglows and host galaxies of two short bursts, and host galaxies for two additional bursts with known optical afterglow positions, and five with X-ray positions (<~6" radius). In eight of the nine cases we find that the most probable host galaxies are faint, R~23-26.5 mag, and are therefore starkly different from the first few short GRB hosts with R~17-22 mag and z<~0.5. Indeed, we measure spectroscopic redshifts of z~0.4-1.1 for the four brightest hosts. A comparison to large field galaxy samples, as well as the hosts of long GRBs and previous short GRBs, indicates that the fainter hosts likely reside at z>~1. Our most conservative limit is that at least half of the five hosts without a known redshift reside at z>0.7 (97% confidence level), suggesting that about 1/3 to 2/3 of all short GRBs originate at higher redshifts than previously determined. This has two important implications: (1) we constrain the acceptable age distributions to a wide lognormal (?>~1) with ?*~4-8 Gyr, or to a power law, P(?)~?n, with -1<~n<~0 and (2) the inferred isotropic energies, E?,iso~1050-1052 ergs, are significantly larger than ~1048-1049 ergs for the low-redshift, short GRBs, indicating a large spread in energy release or jet opening angles. Finally, we reiterate the importance of short GRBs as potential gravitational-wave sources and find a conservative detection rate with the advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) of ~2-6 yr-1.

Berger, E.; Fox, D. B.; Price, P. A.; Nakar, E.; Gal-Yam, A.; Holz, D. E.; Schmidt, B. P.; Cucchiara, A.; Cenko, S. B.; Kulkarni, S. R.; Soderberg, A. M.; Frail, D. A.; Penprase, B. E.; Rau, A.; Ofek, E.; Burnell, S. J. Bell; Cameron, P. B.; Cowie, L. L.; Dopita, M. A.; Hook, I.; Peterson, B. A.; Podsiadlowski, P.; Roth, K. C.; Rutledge, R. E.; Sheppard, S. S.; Songaila, A.

2007-08-01

440

Innovative, High-Pressure, Cryogenic Control Valve: Short Face-to-Face, Reduced Cost  

NASA Technical Reports Server (NTRS)

A control valve that can throttle high-pressure cryogenic fluid embodies several design features that distinguish it over conventional valves designed for similar applications. Field and design engineers worked together to create a valve that would simplify installation, trim changes, and maintenance, thus reducing overall cost. The seals and plug stem packing were designed to perform optimally in cryogenic temperature ranges. Unlike conventional high-pressure cryogenic valves, the trim size can be changed independent of the body. The design feature that provides flexibility for changing the trim is a split body. The body is divided into an upper and a lower section with the seat ring sandwiched in between. In order to maintain the plug stem packing at an acceptable sealing temperature during cryogenic service, heat-exchanging fins were added to the upper body section. The body is made of stainless steel. The seat ring is made of a nickel-based alloy having a coefficient of thermal expansion less than that of the body material. Consequently, when the interior of the valve is cooled cryogenically, the body surrounding the seat ring contracts more than the seat ring. This feature prevents external leakage at the body-seat joint. The seat ring has been machined to have small, raised-face sealing surfaces on both sides of the seal groove. These sealing surfaces concentrate the body bolt load over a small area, thereby preventing external leakage. The design of the body bolt circle is different from that of conventional highpressure control valves. Half of the bolts clamp the split body together from the top, and half from the bottom side. This bolt-circle design allows a short, clean flow path, which minimizes frictional flow losses. This bolt-circle design also makes it possible to shorten the face-toface length of the valve, which is 25.5 in. (65 cm). In contrast, a conventional, high-pressure control valve face-to-face dimension may be greater than 40 in. (>1 m) long.

2002-01-01

441

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

442

X-ray Spectral Evolution of Her X-1 in a Low State and the Following Short High State  

E-print Network

We analyzed spectral variations of $\\sim 8.5$ days long RXTE monitoring observations of Her X-1 in December 2001. This set of observations enables, for the first time, frequent continuous monitoring (111 pointings in $\\sim 8.5$ days) of the source with RXTE including $\\sim 1.7$ days long low state part and the following $\\sim 6.8$ days long short high state part. We used absorbed power law model with iron line energy complex modeled as a Gaussian to fit both the 3-60 keV PCA-HEXTE overall short high state spectrum and 3-20 keV individual PCA spectra. Additional partial cold absorber model was used for both cases. Using 3-20 keV individual PCA spectra, absorption in anomalous dips and preeclipse dips in short high state were compared. Decreasing ratio of unabsorbed flux to absorbed flux with increasing unabsorbed flux in anomalous and preeclipse dips was interpreted as an evidence of the fact that the regions causing opaque obscuration and soft absorption are not geometrically far away from each other. Higher iron line peak energies in low state and short high state ($\\sim 6.6-6.9$ keV) were interpreted as a clue of the presence of iron line components other than K$\\alpha$ emission line.

S. C. Inam; A. Baykal

2005-06-10

443

Appliance of high EGR rates with a short and long route EGR system on a heavy duty diesel engine  

Microsoft Academic Search

The goal of this work was to investigate the possibilities of applying high EGR rates with low NO x and PM emission levels on a two-stage turbocharged 12 liter heavy duty diesel engine. The EGR is applied by using a long and short route EGR system. For the ESC operating points A25 and C100 EGR is applied, such that the

Marc van Aken; Frank Willems; Jong de DJ

2007-01-01

444

High-modulation-depth and short-cavity-length silicon FabryPerot modulator with two grating Bragg reflectors  

E-print Network

High-modulation-depth and short-cavity-length silicon Fabry­Perot modulator with two grating Bragg October 1995 We propose a silicon Fabry­Perot planar waveguide modulator structure consisting of two Bragg electron beam lithography and reactive ion etching. Compared to conventional waveguide modulator designs

445

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

446

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

447

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

Reports a cross-sectional study of second language communication among students in a junior high French late immersion program. Effects of language, sex, and grade on willingness to communicate (WTC), anxiety, perceived communication competence, and frequency of communication in French and on attitude/motivation variables are examined globally and

MacIntyre, Peter D.; Baker, Susan C.; Clement, Richard; Donovan, Leslie A.

2003-01-01

448

Compensation performance of decision feedback equalizer in high speed optical communication system  

NASA Astrophysics Data System (ADS)

This paper discusses electronics dispersion compensation (EDC) by decision feedback equalizer (DFE) in high speed optical communication system using the LMS and the RLS algorithms, respectively. The theory of the decomposed DFE derived from basic concept of DFE in EDC is studied. Compared with the traditional DFE, the system complexity of new one has been reduced while it still keeps the high performance of DFE. Simulation results prove the validity of practicability and indicate that the decomposed DFE using RLS algorithm can more effectively eliminate intersymbol interference (ISI) after being transmitted long distance.

Lu, Li; Lei, Jianming; Bing, Linlin; Zou, Xuecheng

2008-11-01

449

Incorporating risk communication into highly pathogenic avian influenza preparedness and response efforts.  

PubMed

A highly pathogenic avian influenza (HPAI) outbreak in the United States will initiate a federal emergency response effort that will consist of disease control and eradication efforts, including quarantine and movement control measures. These movement control measures will not only apply to live animals but also to animal products. However, with current egg industry "just-in-time" production practices, limited storage is available to hold eggs. As a result, stop movement orders can have significant unintended negative consequences, including severe disruptions to the food supply chain. Because stakeholders' perceptions of risk vary, waiting to initiate communication efforts until an HPAI event occurs can hinder disease control efforts, including the willingness of producers to comply with the response, and also can affect consumers' demand for the product. A public-private-academic partnership was formed to assess actual risks involved in the movement of egg industry products during an HPAI event through product specific, proactive risk assessments. The risk analysis process engaged a broad representation of stakeholders and promoted effective risk management and communication strategies before an HPAI outbreak event. This multidisciplinary team used the risk assessments in the development of the United States Department of Agriculture, Highly Pathogenic Avian Influenza Secure Egg Supply Plan, a comprehensive response plan that strives to maintain continuity of business. The collaborative approach that was used demonstrates how a proactive risk communication strategy that involves many different stakeholders can be valuable in the development of a foreign animal disease response plan and build working relationships, trust, and understanding. PMID:23402134

Voss, Shauna J; Malladi, Sasidhar; Sampedro, Fernando; Snider, Tim; Goldsmith, Timothy; Hueston, William D; Lauer, Dale C; Halvorson, David A

2012-12-01

450

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

451

Proton-induced population of the isomeric state in Zr89 using short-pulse, high-energy laser systems  

Microsoft Academic Search

Short-pulse ( ps), high-energy laser systems can be used to accelerate electrons, protons and ions to high energies via laser-plasma interactions. Such protons are then capable of causing nuclear reactions within target materials, the subsequent decay of which may be measured using scintillation detectors. During one such experimental campaign, AWE's HELEN laser system was used in chirped-pulse amplification (CPA) mode

Matthew Gardner; Andrew Simons; Peter Thompson; Christopher Allwork; Michael Rubery; Robert Clarke

2009-01-01

452

Author's personal copy Short Communication  

E-print Network

mauritanica demonstrated that low levels of mito- chondrial diversity observed in the European populations been the most popular and commonly used molecular marker to estimate genetic diversity in a varietyDNA genetic diversity is not affected by population size, which could be explained by recurrent selective

Carranza, Salvador

453

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

454

Author's personal copy Short communication  

E-print Network

history: Received 5 February 2010 Accepted 13 May 2010 Available online 27 May 2010 Keywords: pumice heat transfer coefficients for natural pumice clasts are reduced by a factor of 2­3 for particles with similar

Manga, Michael

455

Short communication Can Kittiwakes smell?  

E-print Network

). In this experiment, we used a blend of mammalian musk oils with a strong skunk-like scent (Gusto?, Caven's Lures = 21) or spread with the mammalian musk (Skunk group, n = 26). This experiment was car- ried out during

Leclaire, Sarah

456

Short communication Evidence for fatal  

E-print Network

Zealand waters and analysing video footage of Cape Gannet foraging events from South Africa. We found predators, some- times in poor visibility, presents the risk of collision and associated injury or death existing records for any species of such collisions leading to injuries or death. Here we report a study

Stockin, Karen

457

SHORT COMMUNICATION MORPHOMETRIC AND MERISTIC  

E-print Network

status and the productivity of the two lakes. The results confirm earlier findings, which were based mainly occur in oligotrophic freshwater lakes along the western seaboard (Fig. 1). Arctic char in Ireland not suggest that recognition of distinct Irish subspecies was appropriate. Ferguson (1981) suggested that all

McCarthy, T.K.

458

Method of high speed flow field influence and restrain on laser communication  

NASA Astrophysics Data System (ADS)

For laser communication performance which carried by airplane or airship, due to high-speed platform movement, the air has two influences in platform and laser communication terminal window. The first influence is that aerodynamic effect causes the deformation of the optical window; the second one is that a shock wave and boundary layer would be generated. For subsonic within the aircraft, the boundary layer is the main influence. The presence of a boundary layer could change the air density and the temperature of the optical window, which causes the light deflection and received beam spot flicker. Ultimately, the energy hunting of the beam spot which reaches receiving side increases, so that the error rate increases. In this paper, aerodynamic theory is used in analyzing the influence of the optical window deformation due to high speed air. Aero-optics theory is used to analyze the influence of the boundary layer in laser communication link. Based on this, we focused on working on exploring in aerodynamic and aero-optical effect suppression method in the perspective of the optical window design. Based on planning experimental aircraft types and equipment installation location, we optimized the design parameters of the shape and thickness of the optical window, the shape and size of air-management kit. Finally, deformation of the optical window and air flow distribution were simulated by fluid simulation software in the different mach and different altitude fly condition. The simulation results showed that the optical window can inhibit the aerodynamic influence after optimization. In addition, the boundary layer is smoothed; the turbulence influence is reduced, which meets the requirements of the airborne laser communication.

Meng, Li-xin; Wang, Chun-hui; Qian, Cun-zhu; Wang, Shuo; Zhang, Li-zhong

2013-08-01

459

Acoustic Navigation and Communication forHigh-Latitude Ocean Research Workshop  

Microsoft Academic Search

Recent community reports on autonomousplatforms and Arctic observing U.S. NationalScience Foundation, 2002; Proshutinsky et al.,2004; Rudnick and Perry, 2003 identify thedevelopment of under-ice navigation andtelemetry technologies as one of the criticalfactors limiting the scope of high-latitudemeasurement efforts. Advances in autonomousplatforms (profiling floats, drifters,long-range gliders, and propeller-driven vehicles)promise to revolutionize ocean observations,providing unprecedented spatialand temporal resolution for both short-durationprocess studies and

Craig M. Lee; Jason I. Gobat

2006-01-01

460

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

461

In-situ short circuit protection system and method for high-energy electrochemical cells  

DOEpatents

An in-situ thermal management system for an energy storage device. The energy storage device includes a plurality of energy storage cells each being coupled in parallel to common positive and negative connections. Each of the energy storage cells, in accordance with the cell's technology, dimensions, and thermal/electrical properties, is configured to have a ratio of energy content-to-contact surface area such that thermal energy produced by a short-circuit in a particular cell is conducted to a cell adjacent the particular cell so as to prevent the temperature of the particular cell from exceeding a breakdown temperature. In one embodiment, a fuse is coupled in series with each of a number of energy storage cells. The fuses are activated by a current spike capacitively produced by a cell upon occurrence of a short-circuit in the cell, thereby electrically isolating the short-circuited cell from the common positive and negative connections.

Gauthier, Michel (La Prairie, CA); Domroese, Michael K. (South St. Paul, MN); Hoffman, Joseph A. (Minneapolis, MN); Lindeman, David D. (Hudson, WI); Noel, Joseph-Robert-Gaetan (St-Hubert, CA); Radewald, Vern E. (Austin, TX); Rouillard, Jean (Saint-Luc, CA); Rouillard, Roger (Beloeil, CA); Shiota, Toshimi (St. Bruno, CA); Trice, Jennifer L. (Eagan, MN)

2000-01-01

462

Advances in high-throughput speed, low-latency communication for embedded instrumentation ( 7th Annual SFAF Meeting, 2012)  

ScienceCinema

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

2013-02-11

463

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

464

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

465

A high-average power tapered FEL amplifier at submillimeter frequencies using sheet electron beams and short-period wigglers  

SciTech Connect

A high-average-power FEL amplifier operating at submillimeter frequencies is under development at the University of Maryland. Program goals are to produce a CW, {approximately}1 MW, FEL amplifier source at frequencies between 280 GHz and 560 GHz. To this end, a high-gain, high-efficiency, tapered FEL amplifier using a sheet electron beam and a short-period (superconducting) wiggler has been chosen. Development of this amplifier is progressing in three stages: (1) beam propagation through a long length ({approximately}1 m) of short period ({lambda}{sub {omega}} = 1 cm) wiggler, (2) demonstration of a proof-of-principle amplifier experiment at 98 GHz, and (3) designs of a superconducting tapered FEL amplifier meeting the ultimate design goal specifications. 17 refs., 1 fig., 1 tab.

Bidwell, S.W.; Radack, D.J.; Antonsen, T.M. Jr.; Booske, J.H.; Carmel, Y.; Destler, W.W.; Granatstein, V.L.; Levush, B.; Latham, P.E.; Zhang, Z.X.

1990-01-01

466

A Remote Laboratory for Training in Radio Communications: ERRL  

Microsoft Academic Search

This paper presents, first, a short survey of remote laboratory initiatives in electrical and computer engineering, and then discusses design and development phases of remote laboratory environment on radio communications, the ERRL (European Remote Radio Laboratory). As being the first attempt in establishing of such a large scale remote laboratory on radio communications, ERRL enables access to high technology RF

Ali Kara; E. U. Aydin; R. Oktem; N. Cagiltay

2007-01-01

467

Highly visible-light luminescence properties of the carboxyl-functionalized short and ultrashort MWNTs  

SciTech Connect

Luminescence of the short multiwalled carbon nanotubes (MWNTs) conjugated with carboxylic acid groups has been studied. The results show that the carboxyl-functionalized short MWNTs could emit luminescence and the emission peak appears at 500 nm with a corresponding optimal excitation wavelength centering at 310 nm. When the short MWNTs are filtered through 0.15 {mu}m polytetrafluoroethylene (PTFE) membrane, the ultrashort MWNTs are obtained from the filtrate. An interesting feature for the ultrashort MWNTs is that the emission intensity is strengthened and the peak is slightly blue shifted to 460 nm. This result indicates that the luminescence properties of MWNTs are strongly affected by the tube length. After chemical oxidization cutting, defects and carboxylic acid groups at the tube end and/or sidewall can be produced; the more shorten of MWNTs, the better dispersion and carboxylic passivation of the nanotubes, and the more intense luminescence emissions. The broad emissions are logically attributed to the trapping of excitation energy by defect sites in the carboxyl-functionalized nanotube structure. - Graphical abstract: Luminescence of the short and ultrashort multiwalled carbon nanotubes (MWNTs) conjugated with carboxylic acid groups, which is logically attributed to the trapping of excitation energy by defect sites, has been studied.

Luo Yongsong [Department of Physics, Central China Normal University, Wuhan 430079 (China); Department of Physics, XinYang Normal University, Xinyang 464000 (China)], E-mail: ysluo@mails.ccnu.edu.cn; Xia Xiaohong [Department of Physics, Central China Normal University, Wuhan 430079 (China); Liang Ying [Department of Physics, Central China Normal University, Wuhan 430079 (China); Zhang Yonggang [Department of Physics, Central China Normal University, Wuhan 430079 (China); Ren Qinfeng [Department of Physics, Central China Normal University, Wuhan 430079 (China); Li Jialin [Department of Physics, Central China Normal University, Wuhan 430079 (China)], E-mail: lijl@phy.ccnu.edu.cn; Jia Zhijie [Department of Physics, Central China Normal University, Wuhan 430079 (China); Tang Yiwen [Department of Physics, Central China Normal University, Wuhan 430079 (China)

2007-06-15

468

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

469

Forecasting short-run crude oil price using high- and low-inventory variables  

Microsoft Academic Search

Since inventories have a lower bound or a minimum operating level, economic literature suggests a nonlinear relationship between inventory level and commodity prices. This was found to be the case in the short-run crude oil market. In order to explore this inventoryprice relationship, two nonlinear inventory variables are defined and derived from the monthly normal level and relative level of

Michael Ye; John Zyren; Joanne Shore

2006-01-01

470

Short Time Rated And Protected High Voltage Ac Testing Of Generator Stators Using Parallel Resonant Circuits  

Microsoft Academic Search

Power station generators require short duration HV ac testing of their insulation as part of their acceptance before being put into service. Depending on the value of the capacitance of the insulation, the rating of the test power supply can be large. One method of reducing this supply requirement is to compensate the capacitance with inductance. The paper describes a

Wade Enright; Pat Bodger

471

Dispersive and nonlinear effects in high-speed reconfigurable WDM optical fiber communication systems  

NASA Astrophysics Data System (ADS)

Chromatic dispersion, polarization mode dispersion (PMD) and nonlinear effects are important issues on the physical layer of high-speed reconfigurable WDM optical fiber communication systems. For beyond 10 Gbit/s optical fiber transmission system, it is essential that chromatic dispersion and PMD be well managed by dispersion monitoring and compensation. One the other hand, dispersive and nonlinear effects in optical fiber systems can also be beneficial and has applications on pulse management, all-optical signal processing and network function, which will be essential for high bite-rate optical networks and replacing the expensive optical-electrical-optical (O/E/O) conversion. In this Ph.D. dissertation, we present a detailed research on dispersive and nonlinear effects in high-speed optical communication systems. We have demonstrated: (i) A novel technique for optically compensating the PMD-induced RF power fading that occurs in single-sideband (SSB) subcarrier-multiplexed systems. By aligning the polarization states of the optical carrier and the SSB, RF power fading due to all orders of PMD can be completely compensated. (ii) Chromatic-dispersion-insensitive PMD monitoring by using a narrowband FBG notch filter to recover the RF clock power for 10Gb/s NRZ data, and apply it as a control signal for PMD compensation. (iii) Chirp-free high-speed optical pulse generation with a repetition rate of 160 GHz (which is four times of the frequency of the electrical clock) using a phase modulator and polarization maintaining (PM) fiber. (iv) Polarization-insensitive all-optical wavelength conversion based on four-wave mixing in dispersion-shifted fiber (DSF) with a fiber Bragg grating and a Faraday rotator mirror. (v) Width-tunable optical RZ pulse train generation based on four-wave mixing in highly-nonlinear fiber. By electrically tuning the delay between two pump pulse trains, the pulse-width of a generated pulse train is continuously tuned. (vi) A high-speed all-optical XOR gate based on polarization rotation induced by Kerr effect in a single highly--nonlinear fiber. (vii) Wavelength-shift-free 3R-regeneration of 40-Gbit/s optical RZ signal by OPA with a clock-modulated pump in highly-nonlinear fiber. These techniques will play key roles in future high-speed dynamic WDM optical fiber communication systems and reconfigurable networks.

Yu, Changyuan

472

A High Speed, Long-Range Mobile Communications Link for use in Polar Regions  

NASA Astrophysics Data System (ADS)

The Polar Radar for Ice Sheet Measurements (PRISM) project has developed a high bandwidth, wireless communications link between an autonomous rover and a manned vehicle deployed on a polar ice sheet to exchange real-time video, timing signals for a bistatic radar, and rover sensory data. The PRISM project is developing advanced intelligent remote sensing technology that involves radar systems, an autonomous rover, and communications systems to measure detailed ice sheet characteristics, and to determine bed conditions (frozen or wet) below active ice sheets in both Greenland and Antarctica. While this wireless communications link is being developed to fill a need within the PRISM Project, the same technology will allow polar researchers separated by moderate distances ( 10 km) to exchange data. The communications link is based on a high data rate 802.11b wireless technology, and a prototype system has been tested and evaluated during field experiments conducted at the NorthGRIP ice core drilling camp in Greenland (75 06\\'\\ N, 42 20\\'\\ W) from June 23-July 17, 2003. The IEEE 802.11b standard works in the 2.4-2.483 GHz band and has been widely used for high-speed data transfer in a WLAN (Wireless Local Area Network). It typically has a range of a few hundred meters and theoretical data rates on the order of 11 Mbps. It has been used for a number of applications in home and office environments. We modified a 802.11b system to operate up to a maximum distance of about 8 km and investigated the radio propagation environment over the flat terrain of the Greenland ice sheet. We evaluated its performance along three different tracks of 8 km in length, and made throughput measurements at intervals of 0.5 km. We measured the received signal strength and noise level in 2-s intervals along these 8 km tracks. Also we conducted experiments for four different antenna heights (1, 2, 3 and 5 m) for developing a radio propagation model for WLAN communication over the ice sheet. We found that peer-to-peer communication between nodes on the ice had data rates varying from 4.5 Mbps at close range to 2.5 Mbps at a distance of 8 km from the base station. The design, propagation model, throughput and coverage of this peer-to-peer communications system in Greenland are presented in this paper. This WLAN system has numerous applications in polar field camps. We tested the transfer of real-time video segments across this link for our educational outreach efforts in the field. These video segments were subsequently uploaded using an Iridium-based Internet link, and sent back to the University of Kansas. The wireless Internet connectivity was also made available to members of the North Grip camp, who were able to access e-mail and the Internet from their tents and common areas. However, throughput for wireless access to the Internet was limited by the Iridium-based Internet connection that had a maximum bandwidth of 9.6 Kbps.

Chalishazar, N.; Prescott, G.; Braaten, D.

2003-12-01

473

Demonstration of high-speed multi-user multi-carrier CDMA visible light communication  

NASA Astrophysics Data System (ADS)

We experimentally demonstrated a high-speed multi-user multi-carrier code-division multiple access (MC-CDMA) visible light communication (VLC) system. By employing a commercially available red light emitting diode (LED) and an avalanche photo diode (APD), we achieved a 16-user VLC system enabled by MC-CDMA, pre- and post-equalization, with an overall bit rate of 750 Mb/s over 1.5 m free-space transmission. The measured bit error ratio (BER) of each user is below the 7% pre-forward-error-correction (pre-FEC) threshold of 3.810-3.

Yang, Chao; Wang, Yuanquan; Wang, Yiguang; Huang, Xingxing; Chi, Nan

2015-02-01

474

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

475

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

476

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

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

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

479

First Use of High Charge States for Mass Measurements of Short-Lived Nuclides in a Penning Trap  

NASA Astrophysics Data System (ADS)

Penning trap mass measurements of short-lived nuclides have been performed for the first time with highly charged ions, using the TITAN facility at TRIUMF. Compared to singly charged ions, this provides an improvement in experimental precision that scales with the charge state q. Neutron-deficient Rb isotopes have been charge bred in an electron beam ion trap to q=8-12+ prior to injection into the Penning trap. In combination with the Ramsey excitation scheme, this unique setup creating low energy, highly charged ions at a radioactive beam facility opens the door to unrivaled precision with gains of 1-2 orders of magnitude. The method is particularly suited for short-lived nuclides such as the superallowed ? emitter Rb74 (T1/2=65ms). The determination of its atomic mass and an improved QEC value are presented.

Ettenauer, S.; Simon, M. C.; Gallant, A. T.; Brunner, T.; Chowdhury, U.; Simon, V. V.; Brodeur, M.; Chaudhuri, A.; Man, E.; Andreoiu, C.; Audi, G.; Lpez-Urrutia, J. R. Crespo; Delheij, P.; Gwinner, G.; Lapierre, A.; Lunney, D.; Pearson, M. R.; Ringle, R.; Ullrich, J.; Dilling, J.

2011-12-01

480

First Use of High Charge States for Mass Measurements of Short-Lived Nuclides in a Penning Trap  

SciTech Connect

Penning trap mass measurements of short-lived nuclides have been performed for the first time with highly charged ions, using the TITAN facility at TRIUMF. Compared to singly charged ions, this provides an improvement in experimental precision that scales with the charge state q. Neutron-deficient Rb isotopes have been charge bred in an electron beam ion trap to q=8-12+ prior to injection into the Penning trap. In combination with the Ramsey excitation scheme, this unique setup creating low energy, highly charged ions at a radioactive beam facility opens the door to unrivaled precision with gains of 1-2 orders of magnitude. The method is particularly suited for short-lived nuclides such as the superallowed {beta} emitter {sup 74}Rb (T{sub 1/2}=65 ms). The determination of its atomic mass and an improved Q{sub EC} value are presented.

Ettenauer, S.; Gallant, A. T.; Dilling, J. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada); Simon, M. C.; Chaudhuri, A.; Mane, E.; Delheij, P.; Pearson, M. R. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Brunner, T. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany); Chowdhury, U. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2 (Canada); Simon, V. V. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Ruprecht-Karls-Universitaet, Heidelberg (Germany); Brodeur, M. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada); National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Andreoiu, C. [Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6 (Canada); Audi, G. [CSNSM-IN2P3-CNRS, Universite Paris 11, 91405 Orsay (France); Lopez-Urrutia, J. R. Crespo; Ullrich, J. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Gwinner, G. [Dept. of Physics and Astronomy, Univ. of Manitoba, Winnipeg, MB R3T 2N2 (Canada); Lapierre, A. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); National Superconducting Cyclotron Lab., Michigan State Univ., East Lansing, Michigan 48824 (United States); Lunney, D. [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada); CSNSM-IN2P3-CNRS, Univ. Paris 11, 91405 Orsay (France); Ringle, R. [National Superconducting Cyclotron Lab., Michigan State Univ., East Lansing, Michigan 48824 (United States)

2011-12-30

481

High strain-rate compression testing of a short-fiber reinforced aluminum composite  

Microsoft Academic Search

Compression behavior of 1526 Vf% Saffil short-fiber reinforced Al-1.17wt.%Cu alloy metal matrix composites has been determined over a strain-rate range of approximately 10?4 to 2103 s?1. The strain-rate sensitivity of composite samples at 4% strain, tested parallel and normal to the plane of reinforcement, was found to be higher than that of unreinforced alloy in the strain-rate range studied. Quantitative

M. Guden; I. W. Hall

1997-01-01

482

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

483

High-dose erythropoietin has no effect on short- or long-term graft function following deceased donor kidney transplantation  

Microsoft Academic Search

We evaluated short- and long-term effects of high-dose recombinant human erythropoietin (rHuEPO) in kidney transplantation in a prospective double-blind, placebo-controlled study. Patients with chronic kidney disease following receipt of a deceased donor kidney allograft were randomized to 3 doses of 40,000 units rHuEPO or placebo. The primary study end point was kidney function 6 weeks after transplantation with secondary end

Carsten Hafer; Thomas Becker; Jan T Kielstein; Elisabeth Bahlmann; Anke Schwarz; Nikolai Grinzoff; Daria Drzymala; Isabelle Bonnard; Nicolas Richter; Frank Lehner; Juergen Klempnauer; Hermann Haller; Jana Traeder; Danilo Fliser

2012-01-01

484

Short-term leptin treatment increases fatty acids uptake and oxidation in muscle of high fatfed rats  

Microsoft Academic Search

The purpose of this study was to measure the effects of short-term (10 days) leptin treatment on insulin sensitivity as it pertains to fatty acid (FA) uptake, oxidation, and muscle triglyceride (mTG) synthesis in animals that have been administered a high-fat (HF) diet for 3 months. Male Wistar rats were randomly assigned to 1 of 4 groups. One group was

Mark K. Todd; Ben B. Yaspelkis; Lorraine P. Turcotte

2005-01-01

485

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

486

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

487

An integrated optical/acoustic communication system for seafloor observatories: A field test of high data rate communications at CORK 857D  

NASA Astrophysics Data System (ADS)

We report the successful deployment and testing of an underwater optical communication system that provides high data rate communications over a range of 100 meters from a deep sea borehole observatory located in the northeast Pacific. Optical underwater communications offers many advantages over acoustic or underwater wet mateable connections (UWMC). UMWCs requires periodic visits from a submersible or ROV to plug in and download data. Typically, these vehicles cannot perform any other tasks during these download periods - their time on station is limited, restricting the amount of data that can be downloaded. To eliminate the need for UWMCs requires the use of remote communication techniques such as acoustics or optical communications. Optical communications is capable of high data rates up to 10 mega bits per sec (Mbps) compared to acoustic data rates of 57 Kbps. We have developed an integrated optical/acoustic telemetry system (OTS) that uses an acoustic command system to control a high bandwidth, low latency optical communication system. In July 2010, we used the deep submersible ALVIN to install the Optical Telemetry System (OTS) at CORK 857D. The CORK is instrumented with a thermistor string and pressure sensors that record downhole formation pressures and temperatures within oceanic basement that is pressure sealed from the overlying water column. The seafloor OTS was plugged into the CORKs existing UWMC to provide an optical and acoustic communication interface and additional data storage and battery power for the CORK to sample at 1 Hz data-rate, an increase over the normal 15 sec data sample rate. Using a CTD-mounted OTS lowered by wire from a surface ship, we established an optical communication link at 100 meters range at rates of 1, 5 and 10 Mbps with no bit errors. Tests were also done to establish the optical range of various data rates and the optical power of the system. After a week, we repeated the CTD-OTS experiment and downloaded 20 Mbytes of data over a 5 Mbps link at a range of 80 m. The OTS will remain installed at CORK 857D for a year. Our OTS enables faster data rates to be employed for in situ measurements that were previously limited by data download times from a submersible. The OTS also permits non submersible-equipped vessels to interrogate the CORK borehole observatory on a more frequent basis using a receiver lowered by wire from a ship of opportunity. In the future, autonomous vehicles could interrogate such seafloor observatories in a data-mule configuration and then dock at a seafloor cabled node to download data. While borehole observatories may ultimately be linked into undersea cables relaying real-time data back to shore they represent a superb opportunity to test free water optical communication methods. The lessons learned from our CORK development efforts will go a long way towards establishing the viability of underwater optical communications for a host of autonomous seafloor sensor systems in the future.

Tivey, M.; Farr, N.; Ware, J.; Pontbriand, C.

2010-12-01

488

High-performance diamond-based single-photon sources for quantum communication  

NASA Astrophysics Data System (ADS)

Quantum communication places stringent requirements on single-photon sources. Here we report a theoretical study of the cavity Purcell enhancement of two diamond point defects, the nickel-nitrogen (NE8) and silicon-vacancy (SiV) centers, for high-performance, near on-demand single-photon generation. By coupling the centers strongly to high-finesse optical photonic-band-gap cavities with modest quality factor Q=O(104) and small mode volume V=O(?3) , these system can deliver picosecond single-photon pulses at their zero-phonon lines with probabilities of 0.954 (NE8) and 0.812 (SiV) under a realistic optical excitation scheme. The undesirable blinking effect due to transitions via metastable states can also be suppressed with O(10-4) blinking probability. We analyze the application of these enhanced centers, including the previously studied cavity-enhanced nitrogen-vacancy (NV) center, to long-distance Bennett-Brassard 1984 protocol quantum key distribution (QKD) in fiber-based, open-air terrestrial and satellite-ground setups. In this comparative study, we show that they can deliver performance comparable with decoy state implementation with weak coherent sources, and are most suitable for open-air communication.

Su, Chun-Hsu; Greentree, Andrew D.; Hollenberg, Lloyd C. L.

2009-11-01

489

High power 980 nm laser diode for free space communications at high bitrates  

Microsoft Academic Search

Direct intensity modulation at 3 Gb\\/s is demonstrated with a 980 nm semiconductor laser diode, which is mainly designed for EDFA pumping applications at high power and reliability. Implications of operating conditions on system performance are addressed

Stefan Mohrdiek; Christoph Harder

1998-01-01

490

Short-Term Effects of High-Frequency Chest Compression and Positive Expiratory Pressure in Patients With Cystic Fibrosis  

PubMed Central

Background Cystic fibrosis patients require daily airway clearance therapies. The primary objective of this study was to compare the short-term efficacy of high-frequency chest compression and positive expiratory pressure mask on expectorated sputum, pulmonary function, and oxygen saturation in patients with CF hospitalized for an acute pulmonary exacerbation. Methods A controlled randomized cross-over trial with 24 hours between treatments was used. Thirty-four CF patients (26 6.5 years) were included in the study. Before and 30 minutes after each treatment were recorded: pulmonary function testing, oxygen saturation, and perceived dyspnea. Preference for the two devices was assessed. Results No statistically significant difference between high-frequency chest compression and positive expiratory pressure mask was found in sputum production and in lung function testing. A reduction in SpO2 was found after positive expiratory pressure mask (98 1.0% versus 97 1.2%; P < 0.001). Both treatments induced a statistically significant increase in Borg scale for dyspnea without differences between them. Patients reported greater satisfaction with positive expiratory pressure mask than with high-frequency chest compression (P < 0.001). Conclusion High-frequency chest compression and positive expiratory pressure mask have comparable short-term effects on expectorated sputum and lung function. Although positive expiratory pressure mask was associated with a lower SpO2, it was better tolerated than high-frequency chest compression. Keywords Airway clearance therapies; High-frequency chest compression; Sputum; Cystic fibrosis PMID:22393338

Fainardi, Valentina; Longo, Francesco; Faverzani, Silvia; Tripodi, Maria Candida; Chetta, Alfredo; Pisi, Giovanna

2011-01-01

491

High power test of a wideband diplexer with short-slotted metal half mirrors for electron cyclotron current drive system  

SciTech Connect

The wideband high power diplexer has been developed for combining and fast switching of high power millimeter waves generated by a dual frequency gyrotron. The actual diplexer was tested at the frequency band of 170 GHz in low power. After adjusting a resonant frequency of diplexer for the gyrotron frequency, the evacuated wideband diplexer with short-slotted metal half mirrors was tested at an incident power of about 150 kW, a pulse duration of 30 ms and a frequency band of 170.2170.3 GHz. Any discharge damage was not observed in the diplexer.

Saigusa, M.; Atsumi, K.; Yamaguchi, T.; Nagashima, K. [Ibaraki University, Hitachi, Ibaraki 316-8511 (Japan); Oda, Y.; Fukunari, M.; Sakamoto, K. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)

2014-02-12

492

Core Communications  

ERIC Educational Resources Information Center

The website--it is where people go to find out anything and everything about a school, college, or university. In the relatively short life of the Internet, institutional websites have moved from the periphery to center stage and become strategically integral communications and marketing tools. As the flow of information accelerates and new

Block, Greg; Ross, J. D.; Mulder, David

2011-01-01

493

Spectral mirror for ultra-short, high peak power, multi-PW Ti:sapphire lasers  

NASA Astrophysics Data System (ADS)

A multilayer mirror for spectral filtering adapted to ultra-short and multi-PW Ti:Sa laser has been designed, manufactured and characterized. The method used to determine both the reflectivity shape and the coating design leads to global compensation of gain narrowing, saturation and spectral phase. The result is a spectral control on 200 nm range while keeping a flat spectral phase. This kind of filter will enable obtaining 15 fs pulse duration for multi-PW laser systems based on Ti:Sa.

Giambruno, F.; Freneaux, A.; Chriaux, G.

2013-05-01

494

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

495

RF and Optical Communications: A Comparison of High Data Rate Returns From Deep Space in the 2020 Timeframe  

NASA Technical Reports Server (NTRS)

As NASA proceeds with plans for increased science data return and higher data transfer capacity for science missions, both RF and optical communications are viable candidates for significantly higher-rate communications from deep space to Earth. With the inherent advantages, smaller apertures and larger bandwidths, of optical communications, it is reasonable to expect that at some point in time and combination of increasing distance and data rate, the rapidly emerging optical capabilities would become more advantageous than the more mature and evolving RF techniques. This paper presents a comparison of the burden to a spacecraft by both RF and optical communications systems for data rates of 10, 100, and 1000 Mbps and large distances. Advanced technology for RF and optical communication systems have been considered for projecting capabilities in the 2020 timeframe. For the comparisons drawn, the optical and RF ground terminals were selected to be similar in cost. The RF system selected is composed of forty-five 12-meter antennas, whereas the selected optical system is equivalent to a 10-meter optical telescope. Potential differences in availability are disregarded since the focus of this study is on spacecraft mass and power burden for high-rate mission data, under the assumption that essential communications will be provided by low-rate, high availability RF. For both the RF and optical systems, the required EIRP, for a given data rate and a given distance, was achieved by a design that realized the lowest possible communications subsystem mass (power + aperture) consistent with achieving the lowest technology risk. A key conclusion of this paper is that optical communications has great potential for high data rates and distances of 2.67 AU and beyond, but requires R&D and flight demonstrations to prove out technologies.

Williams, W. Dan; Collins, Michael; Boroson, Don M.; Lesh, James; Biswas, Abihijit; Orr, Richard; Schuchman, Leonard; Sands, O. Scott

2007-01-01

496

Training issues in high-speed fiber-optic and radio communication systems  

NASA Astrophysics Data System (ADS)

Training is an integral phase of information transmission over a wired or wireless channel. During the training period, channel estimation, frequency synchronization, and timing recovery are conducted for enabling a reliable information bit recovery at the receiver. This thesis proposes and verifies in simulation several new ideas and methods that facilitate the training process, optimize the performance of parameter estimation, and maintain a delicate balance between training and data transmission. The goal is to achieve energy-efficient communications over time-varying frequency-selective fiber optic links and radio channels. Its contributions towards combating dispersive fiber optic channels include a novel description of polarization mode dispersion effects in single-mode fibers, allowing the traditional training and equalization techniques to be applied in compensating the polarization mode dispersion, and an original training-based approach that compensates the first-order polarization mode dispersion at low cost. For radio communications, this thesis addresses three important design issues in utilizing the orthogonal frequency division multiplexing (OFDM) technique. OFDM has gained increasing interest, due to its high spectral efficiency and robustness against multipath fading. The main disadvantages of OFDM are its low power efficiency caused by the high peak-to-average power ratio of OFDM signals, and its high sensitivity to frequency synchronization errors. Among our contributions are a fast algorithm that efficiently reduces the peak-to-average power ratio of OFDM signals at low overhead, an extensive comparison of frequency offset tracking algorithms, and finally, closed-form expressions of optimal training length that enables fast training length adjustment to maximize system throughput under varying channel conditions.

Chen, Hong

497

Communicating the Benefits of a Full Sequence of High School Science Courses  

NASA Astrophysics Data System (ADS)

High school students are generally uninformed about the benefits of enrolling in a full sequence of science courses, therefore only about a third of our nation's high school graduates have completed the science sequence of Biology, Chemistry and Physics. The lack of students completing a full sequence of science courses contributes to the deficit in the STEM degree production rate needed to fill the demand of the current job market and remain competitive as a nation. The purpose of the study was to make a difference in the number of students who have access to information about the benefits of completing a full sequence of science courses. This dissertation study employed qualitative research methodology to gain a broad perspective of staff through a questionnaire and document review and then a deeper understanding through semi-structured interview protocol. The data revealed that a universal sequence of science courses in the high school district did not exist. It also showed that not all students had access to all science courses; students were sorted and tracked according to prerequisites that did not necessarily match the skill set needed for the courses. In addition, the study showed a desire for more support and direction from the district office. It was also apparent that there was a disconnect that existed between who staff members believed should enroll in a full sequence of science courses and who actually enrolled. Finally, communication about science was shown to occur mainly through counseling and peers. A common science sequence, detracking of science courses, increased communication about the postsecondary and academic benefits of a science education, increased district direction and realistic mathematics alignment were all discussed as solutions to the problem.

Nicholas, Catherine Marie

498

High-efficiency 20 GHz traveling wave tube development for space communications  

NASA Technical Reports Server (NTRS)

A 75 watt CW high efficiency helix TWT operating at 20 GHz was developed for satellite communication systems. The purpose was to extend the performance capabilities of helix TWTs by using recent technology developments. The TWT described is a unique design because high overall efficiency is obtained with a low perveance beam. In the past, low perveance designs resulted in low beam efficiencies. However, due to recent breakthoughs in diamond rod technology and in collector electrode materials, high efficiencies can now be achieved with low perveance beams. The advantage of a low perveance beam is a reduction in space charge within the beam which translates to more efficient collector operation. In addition, this design incorporates textured graphite electrodes which further enhance collector operation by suppressing backstreaming secondaries. The diamond supported helix circuit features low RF losses, high interaction impedance, good thermal handling capability and has been designed to compensate for the low perveance beam. One more discussed tube feature is the use of a velocity taper in the output helix that achieves low signal distortion while maintaining high efficiency.

Aldana, S. L.; Tamashiro, R. N.

1991-01-01

499

Short-term effects of high light intensities on soybean nodule activity and photosynthesis  

Microsoft Academic Search

There is little information available on the effects of high light intensity (HLI) on nitrogenase activity in legume nodules. Inhibitory as well as stimulatory effects have been described. The hypothesis that an increase in carbohydrate production is involved in these effects was tested by comparing the effects of high light, high CO2, or low O2 exposure of the shoot. The

Rajae Vidal; Alain Gerbaud; Didier Vidal

1996-01-01

500

Quantification of short-term dynamic of debris flows at the high-Arctic environment, Ebbabreen and Ragnarbreen, Svalbard  

NASA Astrophysics Data System (ADS)

Extensive ice-cored moraines complexes are common elements marking last advance of many of Svalbard glaciers. Sediment gravity flows are the most dynamic parts of these landsystem components, leading to the serious transformations of postglacial landforms. Short-term dynamic of debris flows activity was studied in cm-scale using repetitive topographic surveys. We monitored several debris flows on the forelands of two glaciers: Ebbabreen and Ragnarbreen located near to the Petuniabukta, at the north end of the Billefiorden, Spitsbergen. Reflectorless, robotic scanning was used to obtain accurate and detail topographic data. Six measurement sessions were carried out: three during summer 2012 and three during summer 2013, which enables us to assess seasonal and short-term (weekly) variations. Photographic monitoring was also carried out along with the survey sessions. Digital elevation models (DEMs) generated from each measurement session were subsequently subtracted from each other, providing a spatial picture of the erosion or deposition of material in each cell of the model between survey sessions. By subtracting DEMs from subsequent time periods we created DEMs of Differences - DoDs, which enables us to calculate the amount of material which was moved within the test sites and also to investigate the spatial patterns of transformations. The surveys indicate high dynamic rates of debris flows. Total yearly changes of the volume of sediments and dead-ice for the most active part of the debris flows was around -0.3 m3/m2. However, most of the transformation occurred during summer, with the short term values as high as -0.1 m3/m2 per week. In comparison, dynamic of the other parts of the ice-cored moraines was 10-times lower. Total change in elevation (attributed mainly to dead-ice downwasting) during one year was -0.03 m3/m2, whereas lowering during summer was about 0.01 m3/m2 per week. The results of our study indicate that in case of studied glaciers backwasting was much more effective than downwasting in terms of landscape transformation on the glaciers' forelands. Despite high activity of debris flows, overall short term dynamic of ice-cored moraines for studied sites was relatively low. We suggest that as long as debris cover is sufficiently thick - thicker than the active layer depths - the debris flow activity occur only due to specific topographic conditions and/or occurrence of external meltwater sources. In other areas ice cored moraines remain stable landsystem component in short term (yearly to decadal) time-scale.

Ewertowski, Marek; Tomczyk, Aleksandra

2014-05-01