Sample records for short communication high

  1. Short communication Ion beam-mixed Ge electrodes for high capacity Li rechargeable batteries

    E-print Network

    Volinsky, Alex A.

    Short communication Ion beam-mixed Ge electrodes for high capacity Li rechargeable batteries N modification Ge Germanium Li ion battery anode a b s t r a c t Ion beam modification to effect ion beam mixing in the use of conversion (or synthesizing) electrodes like Si, Ge, and Sn for Li ion battery anodes, which

  2. UNCORRECTED SHORT COMMUNICATION

    E-print Network

    Kocher, Thomas D.

    UNCORRECTED PROOF SHORT COMMUNICATION Identification of a sex-determining region in Nile tilapia Center for Genome Studies, University of New Hampshire, Durham, NH, USA. Institute of Aquaculture, University of Stirling, Stirling, UK Summary Sex determination in the Nile tilapia (Oreochromis niloticus

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

    NASA Astrophysics Data System (ADS)

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

    2006-09-01

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

  4. Potential of High Speed, Short Distance Optical Data Communication on Large Diameter Optical Fibers

    Microsoft Academic Search

    O. Ziemann; H. Poisel; J. Vinogradov

    2006-01-01

    Optical communication systems offer a big number of advantages compared with wireless and copper based systems: no EMI, high capacity and potential free connection. The big disadvantages are the difficult installation and the price of the active components. The use of thick optical fibers like polymer optical fibers or polymer clad silica fibers enables very simple installation and packaging technologies.

  5. High repetition rate, short pulse, diode pumped solid-state laser for space communications

    Microsoft Academic Search

    Christian Larat; J. P. Pocholle; M. Schwarz; Gilles Feugnet; M. Papuchon

    1994-01-01

    The CNES (Centre National d'Etudes Spatiales) established the laser system characteristics for Mars-Earth spatial communications using the Pulse Position Modulation (PPM) technique. Today, diode-pumped solid-state lasers are under intense research and development. Indeed, in comparison with flash-lamp pumped laser, they offer significant advantages in terms of efficiency, compactness, lifetime and high beam quality. We have demonstrated that gain- switch operation

  6. Wear 262 (2007) 220224 Short communication

    E-print Network

    Sawyer, Wallace

    2007-01-01

    Wear 262 (2007) 220224 Short communication Tribological behavior of PEEK components with compositionally graded PEEK/PTFE surfaces David L. Burris, W. Gregory Sawyer Department of Mechanical in revised form 6 March 2006; accepted 21 March 2006 Available online 26 May 2006 Abstract PEEK is a high

  7. 47 CFR 90.371 - Dedicated short range communications service.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  8. A secure short message communication protocol

    Microsoft Academic Search

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

    2008-01-01

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

  9. Short Communication Differential decomposition of arbuscular mycorrhizal

    E-print Network

    Rilli, Matthias C.

    ; received in revised form 30 October 2002; accepted 4 November 2002 Abstract Arbuscular mycorrhizal fungi; Soil carbon; Arbuscular mycorrhiza Arbuscular mycorrhizal fungi (AMF) are ubiquitous endosymbiontsShort Communication Differential decomposition of arbuscular mycorrhizal fungal hyphae and glomalin

  10. Intentionally Short-Range Communications (ISRC)

    NASA Astrophysics Data System (ADS)

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

    1994-02-01

    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.

  11. LE JOURNAL DE PHYSIQUE Short Communication

    E-print Network

    Boyer, Edmond

    2307 LE JOURNAL DE PHYSIQUE Short Communication Cold fusion in a dense electron gas R. Balian, J in metallic palladiun are required in order to bring the cold fusion rate to an observable value. 'Ibme 50 N are known to yield observable rates for "cold fusion" in ddp-molecules [1-3]. One may also notice

  12. SHORT COMMUNICATION Ammonolysis of Trichlorosilanes

    E-print Network

    Mller, Peter

    of silicon nitride as a material which is mechanically stable and has a high resistance against heat.[1-like products from the reaction with ammonia.[8] Recently we reported the cage-like compound (MeSi)6(NH)9 using MeSiCl3 in the presence of sodium in liquid ammonia.[9] The advantage of this method is the formation

  13. Short Communication Accuracy of Multiplexed Illumina Platform-Based Single-

    E-print Network

    California at Berkeley, University of

    Short Communication Accuracy of Multiplexed Illumina Platform-Based Single- Nucleotide Polymorphism consistency on the Illumina genotyping platform for 717 to 1,744 SNP loci between replicate samples of g or amplification. We conclude that highly multiplexed Illumina genotyping may be done on gDNA and wgaDNA obtained

  14. SHORT COMMUNICATION Sexually differentiated, androgen-regulated, larynx-specific

    E-print Network

    Kelley, Darcy B.

    SHORT COMMUNICATION Sexually differentiated, androgen-regulated, larynx-specific myosin heavy that the sarcoplasmic myosin heavy-chain (MyHC) isoform xtMyHC-101d is highly and specifically expressed in the larynx-treated juveniles but not in larynges of untreated juveniles. We compared the larynx-specific expression of xt

  15. SHORT COMMUNICATION Functional divergence in heat shock response following rapid

    E-print Network

    Teixeira, Sara

    SHORT COMMUNICATION Functional divergence in heat shock response following rapid speciation, while further north in colder and lower-salinity areas of the Baltic F. radicans occurs alone (north was more sensitive to heat shock at 25C, either alone or together with high irradiance and desiccation

  16. Short communication: Inactivation of microbial contaminants in raw milk La Serena cheese by high-pressure treatments.

    PubMed

    Arqus, J L; Garde, S; Gaya, P; Medina, M; Nuez, M

    2006-03-01

    La Serena cheese, a Spanish variety made from Merino ewes' raw milk, has a high pH value, low salt content, and high moisture, conditions that are all favorable for growth and survival of contaminating microorganisms, including pathogens. To improve its microbiological quality and safety, high-pressure treatments at 300 or 400 MPa for 10 min at 10 degrees C were applied to 2 batches of La Serena cheese on d 2 or 50 of ripening. Cheese treated on d 2 at 300 MPa showed viable aerobic counts that were 0.99 log units lower than those for control cheese on d 3 and showed counts of enterococci, coagulase-positive staphylococci, gram-negative bacteria, and coliforms that were 2.05, 0.49, 3.14, and 4.13 log units lower, respectively, than control cheese. For cheese treated on d 2 at 400 MPa, the respective reductions in counts were 2.02, 2.68, 1.45, 3.96, and 5.50 log units. On d 60, viable aerobic counts in cheese treated on d 50 at 300 MPa were 0.50 log units lower than those in control cheese, and counts of enterococci, gram-negative bacteria, and coliforms were 1.37, 2.30, and 4.85 log units lower, respectively. For cheese treated on d 50 at 400 MPa, the respective reductions in counts were 1.29, 1.98, 4.47, and > 5 log units. High-pressure treatments at 300 or 400 MPa on d 2 or 50 reduced significantly the counts of undesirable microorganisms, improving the microbiological quality and safety of La Serena cheese immediately after treatment and at the end of the ripening period. PMID:16507682

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

    PubMed

    Baurhoo, B; Mustafa, A

    2014-02-01

    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

  18. Short communication: high insulin concentrations inhibit fatty acid oxidation-related gene expression in calf hepatocytes cultured in vitro.

    PubMed

    Li, P; Wu, C C; Long, M; Zhang, Y; Li, X B; He, J B; Wang, Z; Liu, G W

    2013-06-01

    In dairy cows, ketosis is an important disease associated with negative energy balance, which leads to low blood glucose levels and high blood nonesterified fatty acid levels. The liver is the most active organ in cows for the metabolism of nonesterified fatty acids. Insulin is an anabolic hormone that plays numerous roles in the metabolism of carbohydrates, lipids, and proteins, as well as being a potent regulator of fatty acid oxidation. In this study, using fluorescent quantitative reverse-transcription PCR, ELISA, and primary hepatocytes cultured in vitro, we examined the effect of insulin (0, 5, 10, 20, 50, and 100 nmol/L) on fatty acid oxidation by monitoring mRNA and protein expression levels of key enzymes: long-chain acyl-coenzyme A synthetase, carnitine palmitoyltransferase I, and long-chain acyl-coenzyme A dehydrogenase. The results showed that the mRNA and protein expression of long-chain acyl-coenzyme A synthetase, carnitine palmitoyltransferase I, and long-chain acyl-coenzyme A dehydrogenase was markedly decreased when the concentration of insulin in the media was increased. These findings indicate that high levels of insulin significantly inhibit the expression of genes related to fatty acid oxidation and consequently results in a decreased level of fatty acid oxidation in calf hepatocytes. PMID:23567053

  19. Short Communication Satellite tracking highlights difficulties in the design

    E-print Network

    Exeter, University of

    Short Communication Satellite tracking highlights difficulties in the design of effective protected are concentrated near neritic breeding and nesting grounds. We used satellite telemetry to de- scribe patterns

  20. SHORT COMMUNICATION Development of 55 novel polymorphic microsatellite loci

    E-print Network

    Boyer, Edmond

    SHORT COMMUNICATION Development of 55 novel polymorphic microsatellite loci for the critically pyrosequencing, through 454 GS-FLX Titanium technology, 55 polymorphic microsatellites loci with perfect motif

  1. High Security Communication Protocol for SMS

    Microsoft Academic Search

    Songyang Wu; Chengxiang Tan

    2009-01-01

    Nowadays, short message service (SMS) is faced with various security threats. Thus, the fields of high confidentiality(e.g., mobile E-commerce) require a higher level of security protection on SMS. Secure communication in incredible mobile network has very important significance. This paper presents a high security communication protocol for SMS. Through authentication, decryption and integrity protection, it establishes an end-to-end secure channel

  2. SHORT COMMUNICATION Open Access Extracellular matrix rigidity modulates

    E-print Network

    Kumar, Sanjay

    cues encoded in the extracellular matrix (ECM). While signaling between tumor cells and the ECM that cross-talk between neuroblastoma cells and the extracellular matrix (ECM) influences differentiation [2SHORT COMMUNICATION Open Access Extracellular matrix rigidity modulates neuroblastoma cell

  3. SHORT COMMUNICATION Multiplex Polymerase Chain Reaction Diagnostics of Bed Bug

    E-print Network

    Szalanski, Allen L.

    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

  4. Short communication Continuous plankton recorder underestimates zooplankton abundance

    E-print Network

    Dippner, Joachim W.

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

  5. Short Communication Bilingualism increases neural response consistency and attentional

    E-print Network

    Kraus, Nina

    Short Communication Bilingualism increases neural response consistency and attentional control Bilingualism and Psycholinguistics Laboratory, Evanston, IL, USA c Department of Communication Sciences, Evanston, IL, USA a r t i c l e i n f o Article history: Accepted 29 November 2013 Keywords: Bilingualism

  6. Short communication Short-term depression of synaptic transmission from rat lateral

    E-print Network

    Zhou, Yi-Feng

    Short communication Short-term depression of synaptic transmission from rat lateral geniculate Laboratory, School of Life Sciences, University of Science and Technology of China, 96 Jingzhai Road, Hefei-term synaptic plasticity, paired-pulse depression (PPD) and frequency depression, were prominent in the adult

  7. Frequency Domain Detectors for Different Data-Rate Short-Range UWB Communications

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2006-01-01

    Low and high data-rate applications can be foreseen for future ultra-wideband systems which are based on impulse radio and proper detection schemes have to be designed for the most general scenarios. In this paper, we study the performance of a suitable communication scheme in two different short-range communication scenarios where a base station transmits low or high data-rate flows to

  8. SHORT COMMUNICATION Rat Hypoxanthine Phosphoribosyltransferase cDNA

    E-print Network

    Monnat, Ray

    SHORT COMMUNICATION Rat Hypoxanthine Phosphoribosyltransferase cDNA Cloning and Sequence Analysis, 1991 We have determined the nucleotide sequence.of the rat hprt (hypoxanthine phoephorihosyltransferase oligonucleotide primer pair for efficient PCR amplification of the rat hprf coding region. These sequencedata

  9. Short Communication Evidence of systematic expressed sequence tag IMAGE clone

    E-print Network

    Spirtes, Peter

    Short Communication Evidence of systematic expressed sequence tag IMAGE clone cross of a potentially serious source of error intrinsic to all spotted cDNA microarrays that use IMAGE clones used to generate EST cDNA for sequence clone libraries. Analysis of expression data from two single

  10. Short communication The effects of predictable and unpredictable feeding

    E-print Network

    Raghanti, Mary Ann

    Short communication The effects of predictable and unpredictable feeding schedules on the behavior unpredictability would alter behavior and fecal cortisol concentrations. Major differences in behavior typically restricted to on-time and early feeds. More negative changes in behavior were seen in the unpredictable phase

  11. Molecular and Biochemical Parasitology 105 (2000) 163167 Short communication

    E-print Network

    Beverley, Stephen M.

    2000-01-01

    Molecular and Biochemical Parasitology 105 (2000) 163167 Short communication Tests of heterologous September 1999 Keywords: Heterologous expression; RNA polymerase I; Kinetoplastida; Trypanosoma brucei www.elsevier.com/locate/parasitology.E. Clayton et al. / Molecular and Biochemical Parasitology 105 (2000) 163167164 These were transfected

  12. Molecular and Biochemical Parasitology 108 (2000) 249252 Short communication

    E-print Network

    Beverley, Stephen M.

    2000-01-01

    Molecular and Biochemical Parasitology 108 (2000) 249252 Short communication Blasticidin; Blasticidin S; Blasticidin deaminase; Shuttle vector; Transfection www.elsevier.com/locate/parasitology-6851(00)00210-3 #12;S. Goyard, S.M. Be6erley / Molecular and Biochemical Parasitology 108 (2000) 249252250 only two

  13. Molecular & Biochemical Parasitology 112 (2001) 139141 Short communication

    E-print Network

    2001-01-01

    Molecular & Biochemical Parasitology 112 (2001) 139141 Short communication PCR effectiveness; Sex determination of larvae; PCR www.parasitology-online.com. Schistosoma mansoni is a digenean. / Molecular & Biochemical Parasitology 112 (2001) 139141140 The S. mansoni strain was isolated from man

  14. Molecular and Biochemical Parasitology 110 (2000) 405407 Short communication

    E-print Network

    Beverley, Stephen M.

    2000-01-01

    Molecular and Biochemical Parasitology 110 (2000) 405407 Short communication Transposition Received 14 April 2000; accepted 12 May 2000 www.elsevier.com/locate/parasitology Plasmodium falciparum Parasitology 110 (2000) 405407406 fainter bands suggestive of transposition, as seen previously in Leishmania

  15. Molecular and Biochemical Parasitology 107 (2000) 123128 Short communication

    E-print Network

    Spang, Rainer

    2000-01-01

    Molecular and Biochemical Parasitology 107 (2000) 123128 Short communication Cross Received 7 October 1999; received in revised form 3 December 1999; accepted 15 December 1999 www.elsevier.com/locate/parasitology Parasitology 107 (2000) 123128124 Two constructs were used for the gene replace- ment which were both

  16. Molecular & Biochemical Parasitology 114 (2001) 245247 Short communication

    E-print Network

    Cross, George

    2001-01-01

    Molecular & Biochemical Parasitology 114 (2001) 245247 Short communication Virulencehme a , George A.M. Cross a, *,3 a Laboratory of Molecular Parasitology, The Rockefeller Uni6ersity, 1230 York A6 www.parasitology-online.com. The infectious stages of Trypanosoma brucei are cov- ered by a homogenous

  17. Molecular & Biochemical Parasitology 113 (2001) 337340 Short communication

    E-print Network

    Beverley, Stephen M.

    2001-01-01

    Molecular & Biochemical Parasitology 113 (2001) 337340 Short communication A survey); Expression profiling; Gene discovery; Transcriptional regulation; Chromatin www.parasitology-6851(01)00227-4 #12;N.S. Akopyants et al. / Molecular & Biochemical Parasitology 113 (2001) 337340338 (intergenic

  18. Molecular & Biochemical Parasitology 117 (2001) 211215 Short communication

    E-print Network

    Cross, George

    2001-01-01

    Molecular & Biochemical Parasitology 117 (2001) 211215 Short communication Expression Hoek 1 , George A.M. Cross * Laboratory of Molecular Parasitology, The Rockefeller Uni6ersity, 1230 www.parasitology-online.com. The expression sites (ES) of Trypanosoma brucei are multi-allelic loci

  19. SHORT COMMUNICATION Nitrogen recovery from shrimp pond efuent

    E-print Network

    Lorenzen, Kai

    SHORT COMMUNICATION Nitrogen recovery from shrimp pond efuent: dissolved nitrogen removal has nutrients is widely seen as a key environmental management problem in intensive shrimp farming and other, for example, is incorporated into shrimp tissue, while the remain- der is lost to the pond and, ultimately

  20. SHORT COMMUNICATION A new procedure for making observations of embryo

    E-print Network

    Herrera, Carlos M.

    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

  1. Short Communication Stretching and buckling of polymerized membranes: a Monte

    E-print Network

    Boyer, Edmond

    1055 Short Communication Stretching and buckling of polymerized membranes: a Monte Carlo study E such as Hooke's law. We study the approach to the buckled state of membranes, verify the finite-size scaling relations and measure related critical exponents. In the presence of thermal fluctuations the buckled state

  2. SHORT COMMUNICATION Gas-Phase Separations of Protease Digests

    E-print Network

    Clemmer, David E.

    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

  3. SHORT COMMUNICATION Oxidation processes on conducting carbon additives

    E-print Network

    Cui, Yi

    and power density in today's Li-ion batteries concerns the positive electrode material: the active materials5]. Current efforts to increase the specific energy of Li-ion batteries are mainly focusedSHORT COMMUNICATION Oxidation processes on conducting carbon additives for lithium-ion batteries

  4. Short communication Hedgehog structure in nematic and magnetic systems

    E-print Network

    Paris-Sud XI, Universit de

    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

  5. Short Communication Three ocean state indices implemented in

    E-print Network

    Ribes, Aurlien

    Short Communication Three ocean state indices implemented in the Mercator-Ocean operational suite L., and Soulat, F. 2008. Three ocean state indices implemented in the Mercator-Ocean operational suite. ICES Journal of Marine Science, 65. We present three indices for the state of the ocean, all computed using

  6. Short Communication Granta Gravel model of sandpile avalanches: towards critical

    E-print Network

    Paris-Sud XI, Université de

    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

  7. SHORT COMMUNICATION First Collection Records of Phlebotomine Sand Flies (Diptera

    E-print Network

    SHORT COMMUNICATION First Collection Records of Phlebotomine Sand Flies (Diptera: Psychodidae) From (2011); DOI: 10.1603/ME10170 ABSTRACT The phlebotomine sand ?ies Lutzomyia (Psathyromyia) shannoni (Dyar for either species. KEY WORDS phlebotomine, sand ?y, leishmaniasis, Lutzomyia shannoni, Lutzomyia vexator

  8. SHORT COMMUNICATION Morphological and genetic variation in the endangered Sulawesi

    E-print Network

    Grether, Gregory

    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

  9. Short communication Use of bleach to eliminate contaminating DNA from

    E-print Network

    Kemp, Brian M.

    Short communication Use of bleach to eliminate contaminating DNA from the surface of bones to minimize such contamination. One such technique is the use of bleach (sodium hypochlorite (approximately equal parts of commercial bleach and water) for at least 15 min. Endogenous DNA proved to be quite

  10. SHORT COMMUNICATION Complex rostral neurovascular system in a giant pliosaur

    E-print Network

    Benton, Michael

    SHORT COMMUNICATION Complex rostral neurovascular system in a giant pliosaur Davide Foffa & Judyth. Complex neurovascular systems in many vertebrate rostra have evolved for prey detection. However potential. The neurovascular complex from the snout of an exceptionally well-preserved pliosaur from

  11. Evidence for short-range sonic communication in lymantriine moths

    Microsoft Academic Search

    E. Rowland; P. W. Schaefer; P. Belton; G. Gries

    2011-01-01

    Sexual communication of nun moth, Lymantria monacha (L.), pink gypsy moth, Lymantria mathura Moore, and fumida tussock moth, Lymantria fumida Butler (all Lepidoptera: Noctuidae: Lymantriinae), is known to be mediated by pheromones. We now show that males are attracted by the sounds of conspecific females over short distances and that wing fanning male and female L. monacha, L. mathura and

  12. Short Communication The Cdc42 Guanine Nucleotide Exchange Factor

    E-print Network

    Chen, Christopher S.

    Short Communication The Cdc42 Guanine Nucleotide Exchange Factor FGD1 Regulates Osteogenesis exchange factor that specifically activates Cdc42, a Rho family small GTPase that regulates a variety of both FGD1 expression and Cdc42 activity. Ac- tivating FGD1/Cdc42 signaling by overexpression of either

  13. Short communication Interactions between flexible and rodlike macromolecules

    E-print Network

    Paris-Sud XI, Universit de

    1981 Short communication Interactions between flexible and rodlike macromolecules J.F. Joanny Ecole macromolecules in solution. If the solvent is a good solvent for the flexible chain, a mean-field theory can], we have studied the interactions between macromolecules of differ- ent chemical species A and B

  14. Short Communication EXAFS study of graphite intercalation compounds with transition

    E-print Network

    Paris-Sud XI, Universit de

    1145 Short Communication EXAFS study of graphite intercalation compounds with transition metals (Fe'insertion du graphite avec le Fe et Ni ont t tudis par EXAFS. On montre que les atomes de fer forment des. Abstract. 2014 Graphite intercalation compounds with Fe and Ni have been investigated by means of EXAFS

  15. SHORT COMMUNICATION Hyperpolarisation-activated calcium currents found only in

    E-print Network

    Haseloff, Jim

    SHORT COMMUNICATION Hyperpolarisation-activated calcium currents found only in cells from 953; e-mail mat10@cus.cam.ac.uk). Summary Calcium currents across the plasma membrane of plant cells calcium currents in epidermal cells of the rapidly growing root apex, mature epidermal cells, cortical

  16. SHORT COMMUNICATION Monkeys with disabilities: prevalence and severity of congenital

    E-print Network

    Fedigan, Linda M.

    SHORT COMMUNICATION Monkeys with disabilities: prevalence and severity of congenital limb (Student t-test, P [ 0.05). Keywords Japanese macaque Physical impairment Disability Census of reducing crop raiding, and pro- moting conservation and eco-tourism. Since then, the wild macaques have

  17. Short Communication Substance abuse as a dynamical disease

    E-print Network

    Sprott, Julien Clinton

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

  18. Journal of Biomechanics 36 (2003) 265270 Short communication

    E-print Network

    Valero-Cuevas, Francisco

    2003-01-01

    Journal of Biomechanics 36 (2003) 265270 Short communication The strengthdexterity test groups: 18 unimpaired young adults (p40 yr), 10 unimpaired older adults (>40 yr), and 14 adults diagnosed with carpo-metacarpal osteoarthritis (CMC OA) (X36 yr). We investigated the repeatability of the SD test

  19. SHORT COMMUNICATION Carbon-13 Labeling for Improved Tracer

    E-print Network

    the effects of isotopic labeling using both deuterium substitution (dPS) and 13 C labeling (13 C-PS). ClearSHORT COMMUNICATION Carbon-13 Labeling for Improved Tracer Depth Profiling of Organic Materials Carolina State University, Raleigh, North Carolina, USA 13 C labeling is introduced as an alternative

  20. SHORT COMMUNICATION Metabolic and Weight Loss Effects of Long-

    E-print Network

    Suchard, Marc A.

    SHORT COMMUNICATION Metabolic and Weight Loss Effects of Long- Term Dietary Intervention in Obese A. SUCHARD, AND GUIDO ADLER. Metabolic and weight loss effects of long-term dietary intervention a 3 months of weight loss, all patients were prescribed the same energy-restricted diet (1200 to 1500

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

    E-print Network

    Boyer, Edmond

    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

  2. Short communication Leaf optical properties and photosynthetic leaf absorptances

    E-print Network

    Durako, Michael J.

    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

  3. Journal of Biomechanics 38 (2005) 19381942 Short communication

    E-print Network

    2005-01-01

    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

  4. SHORT COMMUNICATION Methyltransferases mediate cell memory of a genotoxic insult

    E-print Network

    Engelward, Bevin

    that mouse embryonic stem cells exposed to c-radiation bear the effects of the insult for weeks. Specifically-suppressible allele, clears the memory of the insult, thus protecting neighbouring cells from indirect inductionSHORT COMMUNICATION Methyltransferases mediate cell memory of a genotoxic insult RE Rugo1 , JT

  5. Z .Developmental Brain Research 111 1998 143146 Short communication

    E-print Network

    Fernald, Russell

    similarities exist between am- phibian and teleost retinal development, specific studies of the role of cell age for analysis. Embryos were collected and incubated at 308C. At this temperature, retinal cellZ .Developmental Brain Research 111 1998 143146 Short communication Cell death precedes rod

  6. Short Communication Lens Defects and Age-Related Fiber Cell

    E-print Network

    Frederikse, Peter

    Short Communication Lens Defects and Age-Related Fiber Cell Degeneration in a Mouse Model critical region on chromo- some 21. hA PP mice produce fiber cell membrane defects similar to those described in human cataracts and increased age-related lens degeneration. hA PP expression and m

  7. Short Communication Plio-pleistocene diversification and connectivity between mainland and

    E-print Network

    Keogh, Scott

    Short Communication Plio-pleistocene diversification and connectivity between mainland, are congruent with Plio-pleistocene climatic variations. Two highly divergent genetic lineages within Drysdalia in the Pleistocene. 2010 Elsevier Inc. All rights reserved. 1. Introduction Pliocene and Pleistocene climatic

  8. SHORT COMMUNICATION Impact of growing conditions on the competitive ability of

    E-print Network

    Maxwell, Bruce D.

    SHORT COMMUNICATION Impact of growing conditions on the competitive ability of Camelina sativa (L on the competitive ability of Camelina sativa (L.) Crantz (Camelina). Can. J. Plant Sci. 93: 243247. It has been claimed that Camelina sativa, a recently introduced crop in the northern Great Plains, is a highly

  9. Journal of Power Sources 153 (2006) 345349 Short communication

    E-print Network

    Cho, Jaephil

    2006-01-01

    Journal of Power Sources 153 (2006) 345349 Short communication Improvement of 12 V overcharge behavior of LiCoO2 cathode material by LiNi0.8Co0.1Mn0.1O2 addition in a Li-ion cell Jisuk Kim, Mijung Noh, Jaephil Cho Department of Applied Chemistry, Kumoh National Institute of Technology, Gumi, Republic

  10. Millimeter waves for short-range multimedia communication systems

    Microsoft Academic Search

    ORESTE ANDRISANO; VELIO TRALLI; ROBERTO VERDONE

    1998-01-01

    A framework for the performance characterization of short-range communications systems is developed with the intention of investigating the feasibility of new multimedia wireless services at millimeter waves (MMWs). Both narrow- and wide-band systems are considered for mobile and\\/or fixed users. This paper aims at defining and evaluating proper metrics to characterize the service quality for the user and jointly takes

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

    SciTech Connect

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

    2011-07-15

    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.

  12. Evidence for short-range sonic communication in lymantriine moths.

    PubMed

    Rowland, E; Schaefer, P W; Belton, P; Gries, G

    2011-02-01

    Sexual communication of nun moth, Lymantria monacha (L.), pink gypsy moth, Lymantria mathura Moore, and fumida tussock moth, Lymantria fumida Butler (all Lepidoptera: Noctuidae: Lymantriinae), is known to be mediated by pheromones. We now show that males are attracted by the sounds of conspecific females over short distances and that wing fanning male and female L. monacha, L. mathura and L. fumida produce species- and sex-specific wing beat and associated click sounds that could contribute to reproductive isolation. Evidence for short-range communication in these lymantriines includes (i) scanning electron micrographs revealing metathoracic tympanate ears, (ii) laser interferometry showing particular sensitivity of tympana tuned to frequency components of sound signals from conspecifics, and (iii) phonotaxis of male L. monacha and L. fumida to speakers playing back sound signals from conspecific females. We conclude that tympanate ears of these moths have evolved in response not only to bat predation, but also for short-range mate finding and possibly recognition. PMID:21115014

  13. Short communication Preparative isolation and purification of syringin and edgeworoside C from Edgeworthia chrysantha Lindl by high-speed counter-current chromatography

    Microsoft Academic Search

    Jizhong Yan; Shengqiang Tong; Jianjun Chu; Liuqing Sheng; Gang Chen

    The bioactive compound syringin along with edgeworoside C were separated from the n-butanol extract of the stems and barks of Edgeworthia chrysantha Lindl(E. papyrifera) by high-speed counter-current chromatography (HSCCC) while it was difficult to purify each compound by silica gel column chromatography. Syringin was isolated from this plant for the first time. The two-phase solvent system used was composed of

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

    PubMed

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

    2014-08-01

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

  15. Approaching Shannon's capacity limits of fiber optics communications channels using short LDPC codes

    Microsoft Academic Search

    Ivan B. Djordjevic; Bane Vasic

    2004-01-01

    A soft-decision channel-capacity for different fiber-optics communications channel-models is discussed. Short low-density parity-check codes of very-high code-rates, large minimum distance, low-complexity encoding and decoding approaching the Shannon's limit within 0.7 dB at BER of 5\\/spl times\\/10\\/sup -7\\/ are presented, 2.5 dB better than turbo codes.

  16. Short communication: Responses to supplemental Saccharomyces cerevisiae fermentation product and triticale grain in dairy cows grazing high-quality pasture in early lactation.

    PubMed

    Irvine, L D; Freeman, M J; Donaghy, D J; Yoon, I; Lee, G; Roche, J R

    2011-06-01

    Supplementing cows grazing highly digestible pasture with a Saccharomyces cerevisiae fermentation product (SCFP) was hypothesized to increase dry matter (DM) intake and milk production. Sixty multiparous dairy cows were fed 3 kg of crushed triticale DM/cow per day for 23 4.4 d before calving. Half of the cows received SCFP (60 g/d; Diamond V Original XP; Diamond V Mills, Inc., Cedar Rapids, IA). Cows in both treatment groups were randomly allocated at calving to 1 of 2 amounts (3 or 6 kg of DM/d) of triticale feeding with or without 60 g of SCFP/day (n=15/treatment) until 84 days in milk. The amount of pasture harvested (kg of DM/cow per day) and milk yield (kg/cow per day) were not affected by SCFP. Milk protein content and yield were greater in cows receiving 6 kg of crushed triticale DM/d. Plasma nonesterified fatty acids and ?-hydroxybutyrate concentrations were not affected by SCFP supplementation, but were lower in cows fed 6 kg of crushed triticale DM/d than those fed 3 kg of DM/d. Supplementation with SCFP increased milk lactose content without affecting milk production under the conditions investigated. PMID:21605780

  17. Short communication Simulation of a thermal battery using Phoenics

    Microsoft Academic Search

    Giancarlo C. S. Freitas; Fernando C. Peixoto; Ardson S. Vianna Jr

    Thermal batteries are primary disposable systems specially designed to develop a high energy density in a short period. In the present work, the modeling of heat generation and propagation within three Ca\\/CaCrO4 thermal batteries has been carried out, using a transient model. The commercial CFD software Phoenics has been used and, through a typical finite volume approach, the related 2D

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

    Microsoft Academic Search

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

    2003-01-01

    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.

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

    E-print Network

    Oliver, Douglas L.

    Secure Email Communication: A Short Guide for Patients WHEN TO USE EMAIL Many UConn Health Center There are a number of risks that you should consider: providers welcome secure email communication with their patients. Your provider may choose to use secure email to communicate with you. This fact Email can

  20. Performance assessment of lower VHF band for short-range communication and geolocation applications

    NASA Astrophysics Data System (ADS)

    Dagefu, Fikadu T.; Choi, Jihun; Sheikhsofla, Morteza; Sadler, Brian M.; Sarabandi, Kamal

    2015-05-01

    The focus of this paper is to characterize near-ground wave propagation in the lower very high frequency (VHF) band and to assess advantages that this frequency band offers for reliable short-range low-data rate communications and geolocation applications in highly cluttered environments as compared to conventional systems in the microwave range. With the advent of palm-sized miniaturized VHF antennas, interest in low-power and low-frequency communication links is increasing because (1) channel complexity is far less in this frequency band compared to higher frequencies and (2) significant signal penetration through/over obstacles is possible at this frequency. In this paper, we quantify the excess path loss and small-scale fading at the lower VHF and the 2.4 GHz bands based on short-range measurements in various environments. We consider indoor-to-indoor, outdoor-to-indoor, and non-line-of-sight outdoor measurements and compare the results with measurements at higher frequencies which are used in conventional systems (i.e., 2.4 GHz). Propagation measurements at the lower VHF band are carried out by using an electrically small antenna to assess the possibility of achieving a miniaturized, mobile system for near-ground communication. For each measurement scenario considered, path loss and small-scale fading are characterized after calibrating the differences in the systems used for measurements at different frequencies, including variations in antenna performance.

  1. SHORT COMMUNICATION Effect of Salt Marsh Drainage on the Distribution ofTabamis

    E-print Network

    larvae most in of marsh, dominated by Spartina altemiflora Loisel short-form. The rate of water drainage deep collected from of salt marsh covered by S. alterniflora short-form. The dried in the Tullgren15TO7 SHORT COMMUNICATION Effect of Salt Marsh Drainage on the Distribution ofTabamis mgromttatus

  2. Physically short crack propagation in metals during high cycle fatigue

    Microsoft Academic Search

    C. Santus; D. Taylor

    2009-01-01

    In metals, during high cycle fatigue on plain specimens, almost the entire fatigue life is spent as short crack initiation and propagation. The fatigue short crack life can be schematically divided into two subsequent phases: microstructurally short crack and physically short crack. Recently, Chapetti proposed a physically short crack threshold and propagation driving force model [Chapetti MD. Fatigue propagation threshold

  3. Vehicular wireless short-range communication for improving intersection safety

    Microsoft Academic Search

    Long Le; Andreas Festag; Roberto Baldessari; Wenhui Zhang

    2009-01-01

    Vehicle-to-infrastructure and vehicle-to-vehicle communication has recently garnered considerable attention from both academia and industry because it holds the potential to improve road safety and to reduce road accidents. For this reason, V2X communication has been considered a key technology of the future Intelligent Transportation Systems. Use cases for V2X communication for enhancing intersection safety are appealing because intersections are the

  4. 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 online 31 March 2010 Keywords: Microbial fuel cell (MFC) Nafion Electrochemical impedance spectroscopy (EIS) Internal resistance Electricity production The performance of tubular microbial fuel cells (MFC

  5. Short communication Phenoloxidase and QX disease resistance in Sydney rock oysters

    E-print Network

    Raftos, David

    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

  6. Short Communication Initial studies of mechanical compression on neurogenesis with neonatal

    E-print Network

    Tang, William C

    Short Communication Initial studies of mechanical compression on neurogenesis with neonatal neural by the Institutional Animal Care and Use Committee (IACUC) of the University of California, Irvine. The mice were

  7. Short Communication Reproduction of honeybee workers is regulated by epidermal growth

    E-print Network

    Wenseleers, Tom

    Short Communication Reproduction of honeybee workers is regulated by epidermal growth factor Keywords: Reproductive division Epidermal growth factor receptor Fertility Hymenoptera Honeybee Apis, also induces reproduc- tion in worker honeybees (Apis mellifera). These data show that worker fertility

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

    E-print Network

    Baker, Robert J.

    Short Communication Molecular dating of the diversification of Phyllostominae bats based on nuclear-Miocene deposits in Colombia, northern South America (Savage, 1951; Czaplewski, 1997). The availability of fossil

  9. Short communication A dynamic graphical interface for visualizing projected, measured, and

    E-print Network

    Short communication A dynamic graphical interface for visualizing projected, measured and freshwater coastal surface water elevations. There is also a need for effectively communicating variability water elevation forecasts. Here, we introduce an interactive web-based interface, the Great Lakes Water

  10. HOW TO EFFICIENTLY DETECT DIFFERENT DATA-RATE COMMUNICATIONS IN MULTIUSER SHORT-RANGE IMPULSE RADIO UWB SYSTEMS

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2006-01-01

    Low and high data-rate applications can be foreseen for fu- ture ultra-wideband systems which are based on impulse ra- dio and proper detection schemes have to be designed for the most general scenarios. In this paper, an innovative fre- quency domain detection strategy is tested in two different indoor short-range communication scenarios where several mobile terminals transmit low or high

  11. 1052 [Auk, Vol. 118Short Communications The Auk 118(4):10521057, 2001

    E-print Network

    Dearborn, Don

    1052 [Auk, Vol. 118Short Communications The Auk 118(4):10521057, 2001 Do Golden-cheeked Warblers species with limited breeding habitat. We examined nest-patch vegetation of the Golden- cheeked Warbler (Dendroica chrysoparia), a federally endangered migratory songbird. Golden-cheeked Warblers breed in short

  12. Bend-insensitive ultra short long-period gratings by the electric arc method and their applications to harsh environment sensing and communication.

    PubMed

    Nam, Sung; Zhan, Chun; Lee, Jon; Hahn, Corey; Reichard, Karl; Ruffin, Paul; Deng, Kung-Li; Yin, Shizhuo

    2005-02-01

    Ultra short long-period gratings (LPGs) fabricated using the electric arc discharge method are demonstrated with regular single-mode fibers. The gratings were as short as two periods, which were the shortest LPGs ever reported. The evolution of this short gratings and their characteristics are investigated in this paper. The excellent bending insensitivity and high temperature robustness demonstrated by this unique LPG make it particularly suitable for harsh environment sensing and communication. PMID:19494933

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

    E-print Network

    Kouznetsov, Dmitrii

    stabili- zation, interferometric gravitational-wave detection, or space communications) also requireHigh-power single-mode solid-state laser with a short, wide unstable cavity Dmitrii Kouznetsov, Jean-Franois Bisson, Kazunori Takaichi, and Ken-ichi Ueda Institute for Laser Science, University

  14. SHORT COMMUNICATIONS 691 The Condor 106:691695

    E-print Network

    Temeles, Ethan J.

    (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

  15. Short and Robust Communication Paths in Dynamic Wireless Networks

    Microsoft Academic Search

    Yoann Pign; Frdric Guinand

    2010-01-01

    \\u000a We consider the problem of finding and maintaining communication paths in wireless mobile ad hoc networks (MANET). We consider\\u000a this problem as a bi-objective problem when trying to minimize both the length of the constructed paths and the number link\\u000a reconnections. We propose two centralized algorithms that help analyse the problem from a dynamic graph point of view. These\\u000a algorithms

  16. Systems and methods for short range RF communication

    NASA Technical Reports Server (NTRS)

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

    2012-01-01

    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.

  17. Spacecraft design project: High latitude communications satellite

    NASA Technical Reports Server (NTRS)

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

    1989-01-01

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

  18. Empirical Analysis on the Human Dynamics of a Large-Scale Short Message Communication System

    NASA Astrophysics Data System (ADS)

    Zhao, Zhi-Dan; Xia, Hu; Shang, Ming-Sheng; Zhou, Tao

    2011-06-01

    Research on human behavior has attracted increasing attention recently because of its scientific significance and potential applications. Some empirical results have indicated that the timing of many human activities follows non-Poisson statistics. We analyze a real-life huge dataset of short message communication with 6326713 users and 37577781 records during the 2006 Chinese New Year. The results show that the number of short message sendings, the interevent time between two consecutive short message sendings and the response time all follow heavy-tailed distribution. We further observe a strongly positive correlation between the activity and the power-law exponent of the interevent time distribution. In addition, the short message communication system displays a bursty property yet no memory effects, which is in particular different from some well-studied human-activited systems such as email-sending, library-loaning and file printing.

  19. Short range RF communication for jet engine control

    NASA Technical Reports Server (NTRS)

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

    2007-01-01

    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.

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

    E-print Network

    Paris-Sud XI, Universit de

    agronomie: plant genetics and breeding - short communication Prsence au Maroc de la race 2 de des sciences, universit IBN-Toufail, Kenitra, Maroc; 3 Station d'amlioration des plantes, Great. Actuellement, une dizaine de races et 16 gnes PI ont t dcrits (Gulya et al, 1991 a, b, 1995). Au Maroc

  1. Short communication Carbon nanoporous layer for reaction location management and performance

    E-print Network

    Mench, Matthew M.

    near the negative electrode flow field. a r t i c l e i n f o Article history: Received 31 July 2012Short communication Carbon nanoporous layer for reaction location management and performance nearest the membrane and nearest the flow field. Results with the nanotube layer on the positive electrode

  2. Z .Journal of Volcanology and Geothermal Research 88 1999 201207 Short communication

    E-print Network

    Zhang, Youxue

    Z .Journal of Volcanology and Geothermal Research 88 1999 201207 Short communication Exsolution. Geotherm. Res. 74, 1938 also found an increase of the exsolution enthalpy with pressure up to 20 bar. Z .PII: S0377-0273 98 00115-2 #12;( )Y. ZhangrJournal of Volcanology and Geothermal Research 88 1999

  3. J. Phys. III France 6 (1996) 825-829 JULY 1996, PAGE 825 Short Communication

    E-print Network

    Paris-Sud XI, Universit de

    1996-01-01

    J. Phys. III France 6 (1996) 825-829 JULY 1996, PAGE 825 Short Communication Guinier of the chemical hardening of this kind of alloy. The other two variants for a given gliding plane seem to be soft the expansion of this fascinating technique. In these days, a variety of metals, alloys and com- posite

  4. SHORT COMMUNICATION Tetrodotoxin affects survival probability of rough-skinned newts

    E-print Network

    Brodie III, Edmund D.

    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

  5. SHORT COMMUNICATIONS Energetic Cost of Insecticide Resistance in Culex pipiens Mosquitoes

    E-print Network

    Rivero, Ana

    ) of larvae and adult females of the mosquito Culex pipiens L. resistant to insecticides through two differentSHORT COMMUNICATIONS Energetic Cost of Insecticide Resistance in Culex pipiens Mosquitoes A. RIVERO-off theory, insecticide resistant mosquitoes through the overproduction of esterases contain on average 30

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

    ERIC Educational Resources Information Center

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

    2013-01-01

    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

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

    E-print Network

    Douches, David S.

    2001-01-01

    Amer J of Potato Res (2001) 78:319-322 319 Short Communication Susceptibility of Potato (Solanum:kirkw@msu.edu ABSTRACT Late blight is an important disease of potato (Solanum tuberosum L.) worldwide, and therefore significantly less infected foliage than the susceptible check cultivars. Tuber susceptibility was significantly

  8. SHORT COMMUNICATION Previous exposure to a low infectious dose of Leishmania

    E-print Network

    Stryker, Gabrielle A.

    SHORT COMMUNICATION Previous exposure to a low infectious dose of Leishmania major exacerbates infection with Leishmania infantum in the susceptible BALB/c mouse Catherine S. Nation & Blaise Dondji The geographic distribution of Leishmania major overlaps with several other species of Leishmania. This study

  9. SHORT COMMUNICATION A PLESIOSAUR CONTAINING AN ICHTHYOSAUR EMBRYO AS STOMACH CONTENTS

    E-print Network

    Socha, Jake

    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

  10. 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 the embryo from cyto- toxic drugs that can disrupt cell division or induce apoptosis. The energy cost and the sea urchin embryo as a convenient aquatic model organism; their combined use allows reproducible

  11. 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

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

    E-print Network

    Fernández de Córdoba, Pedro

    Short communication Optimization of hybrid ­ ground coupled and air source ­ heat pump systems 2008 Accepted 14 January 2010 Available online 28 January 2010 Keywords: Ground coupled heat pump Air to water heat pump Thermal storage device Hybrid HVAC system Energy efficiency Numerical simulation a b

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

    E-print Network

    Dasgupta, Dipankar

    Short Communication Functional ear (a)symmetry in brainstem neural activity relevant to encoding (FFR) Functional ear asymmetry Experience-dependent plasticity Subcortical a b s t r a c t Pitch areas. This experiment investigates whether ear asymmetries vary in brainstem representation of pitch

  14. SHORT SCIENTIFIC COMMUNICATION Acoustic recordings in human ear canals to sounds

    E-print Network

    Oliver, Douglas L.

    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

  15. Smart Card Applications and Mobility in a World of Short Distance Communication

    Microsoft Academic Search

    Michael Rohs; Harald Vogt

    2001-01-01

    Abstract The CASTING project is concerned with the application of smart card technology in combination with short distance wireless communication. This report focuses on secure access to Web pages, meaning that the right person has access to his or her personal Web pages in a manner that respects integrity, authenticity and confidentiality. This requires authentication of users, which is achieved

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

    E-print Network

    Paris-Sud XI, Universit de

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

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

    E-print Network

    Sokolowski, Marla

    Short communication Inaccessible food cues affect stress and weight gain in calorically-restricted of Psychology, 100 St. George Street, Toronto, ON, Canada M5S 3G3 Introduction Caloric restriction (CR) in animals has various physiological benefits, including increased longevity, postponement of age- related

  18. Short Communication Coating with paclitaxel improves graft survival in a porcine model of

    E-print Network

    Park, Jong-Sang

    implanted four pairs of paclitaxel-coated grafts and four pairs of control grafts in eight Landrace pigsShort Communication Coating with paclitaxel improves graft survival in a porcine model cause of failure of polytetra- fluoroethylene (PTFE) dialysis grafts. We recently reported that coating

  19. Short communication Double-diffusive convection in a rotating cylindrical annulus with conical caps

    E-print Network

    Simitev, Radostin D

    Short communication Double-diffusive convection in a rotating cylindrical annulus with conical caps Accepted 20 April 2011 Available online 28 April 2011 Keywords: Double-diffusive convection Buoyancy-driven instabilities Planetary core a b s t r a c t Double-diffusive convection driven by both thermal

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

    E-print Network

    Schweik, Charles M.

    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

  1. 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

  2. Short Communication Molecular phylogeny of Hemidactylus geckos (Squamata: Gekkonidae) of the

    E-print Network

    Karanth, K Praveen

    Short Communication Molecular phylogeny of Hemidactylus geckos (Squamata: Gekkonidae) of the Indian subcontinent reveals a unique Indian radiation and an Indian origin of Asian house geckos Rohini Bansal, K the phylogeny of the Indian Hemidactylus geckos based on mitochondrial and nuclear DNA markers sequenced from

  3. SHORT COMMUNICATION Habitat patch size and isolation as predictors of occupancy

    E-print Network

    Agnarsson, Ingi

    SHORT COMMUNICATION Habitat patch size and isolation as predictors of occupancy and number and degrees of isolation, accurate measurements of habitat patch size, and an accurate estimate of occupancy Abstract How fully a suitable habitat patch is utilized by organisms depends crucially on patch size

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

    E-print Network

    Crisosto, Carlos H.

    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

  5. 432 ShortCommunications [Auk,Vol. 108 unmated Northern Mockingbirds, Mimus poly-

    E-print Network

    Lougheed, Stephen

    432 ShortCommunications [Auk,Vol. 108 unmated Northern Mockingbirds, Mimus poly- glottos. Fuc. 1983. Role of chatburstversussongin the defenseof fall ter- ritory in mockingbirds (Mimus polyglottos).J. Comp. Psychol.97:292-301. L. E. HYATt, & L. GREGORCY!C.1990. Song playback initiates

  6. SHORT COMMUNICATION CD45RA T-cell activation without proliferation by a

    E-print Network

    Cai, Long

    SHORT COMMUNICATION CD45RA T-cell activation without proliferation by a partial agonist monoclonal antibody to b1 integrin Matthew J Billard and Bradley W McIntyre CD45RA T cells are fully co) and VCAM-1 (a4b1), failed to costimulate proliferation in the CD45RA subset, while retaining the ability

  7. 392 ShortCommunications [Auk, Vol. 105 The Relationship Between Hylocichia and Catharus (Turdinae)

    E-print Network

    Winker, Kevin

    392 ShortCommunications [Auk, Vol. 105 The Relationship Between Hylocichia and Catharus (Turdinae, with Hylocichlamustelina,in- cluded the North American Catharusthrushes, C.gut- tatus,C.fuscescens,C. minimus,and C American Catharus thrushes, should be considered congeneric with the Neotropical group of Catharus thrushes

  8. Short communication Real-time estimation of lead-acid battery parameters: A dynamic

    E-print Network

    Ray, Asok

    packs are increasingly being used in vehicles, renewable energy applications, power backup systems) to efficiently allocate power and energy within battery packs and between other prime movers such as internalShort communication Real-time estimation of lead-acid battery parameters: A dynamic data

  9. 850 SHORT COMMUNICATIONS formed by the Yellow-legged Gull which commonly

    E-print Network

    Holberton, Rebecca L.

    850 SHORT COMMUNICATIONS formed by the Yellow-legged Gull which commonly prey on nests of Audouin's Gull, especiallyin sub- colonieswith low densities(Oro and Martinez 1994, Gonzalez-Solis et al. 1995, kleptoparasitismand disturbanceby Yellow-legged Gull on Audouin's Gull in two western Mediterranean colonies,p. 20

  10. The Impact of Business Communication Education on Students' Short- and Long-Term Performances

    ERIC Educational Resources Information Center

    Zhao, Jensen J.; Alexander, Melody W.

    2004-01-01

    The purpose of this longitudinal study was to identify the short- and long-term impact of business communication education on students' skill developments and performance outcomes. Nearly 400 students at an AACSC International-accredited business college participated in the study during their sophomore and senior years. The findings indicate that

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

    E-print Network

    Crews, David

    Short Communication The nitric oxide synthase inhibitor l-NAME suppresses androgen-induced male July 2005 Abstract The synthesis of nitric oxide by the enzyme nitric oxide synthase (NOS) is involved, suggesting that the central role of nitric oxide synthesis is conserved in this species. The deficit

  12. Journal of Insect Behavior, Vol. 13, No. 2, 2000 Short Communication

    E-print Network

    Inouye, Brian

    Journal of Insect Behavior, Vol. 13, No. 2, 2000 Short Communication Use of Visual and Olfactory a closed canopy. Experiments, conducted during July of 1997 and 1998, manipulated visual cues and olfactory metatarsalis; visual cues; nest recognition; solitary bees. INTRODUCTION Both social and solitary Hymenoptera

  13. SHORT COMMUNICATION: EVOLUTION OF BACTERIAL COMMUNITY IN A PYRITIC REFRACTORY GOLD ORE COLUMN LEACHING ENVIRONMENT

    Microsoft Academic Search

    C. BOUFFARD SYLVIE; G. DIXON DAVID

    2004-01-01

    This short communication highlights important biological features of a pyritic refractory gold ore heap-leaching environment. Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans were to be two of only three bacterial species detected on the ore surfaces at ambient temperature. Sulfobacillus was not originally introduced in the inoculum, but was later detected in the column. Only organisms of the Leptospirillum genus were present

  14. SHORT COMMUNICATION A Contribution to the Inventory of Coleoptera of Missouri

    E-print Network

    Mathis, Wayne N.

    SHORT COMMUNICATION A Contribution to the Inventory of Coleoptera of Missouri: New Records from a preliminary survey of the beetles of Benton County as a contribution to the state's inventory of Coleoptera omitted. 1 Dept. of Entomology, 413 Biological Sciences Building, University of Georgia, Athens, Georgia

  15. Short communication On the non local character of Wannier functions in hybrid bands

    E-print Network

    Paris-Sud XI, Universit de

    1091 Short communication On the non local character of Wannier functions in hybrid bands J. Friedel binding approach, it is stressed once more that Wannier functions built from hybrid bands are usually rather weakly localized. Conditions for Mott localization using Wannier functions arguments

  16. Short communication Biosensor based on chemically-designed anchorable cytochrome c

    E-print Network

    Dalang, Robert C.

    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

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

    E-print Network

    Indiana University

    Anim Cogn DOI 10.1007/s10071-010-0347-4 123 SHORT COMMUNICATION Big brains are not enough of information (Dunbar and Shultz 2007). It has also been reported that brain size correlates with innovation rate, learning speed, mechanical problem-solving, and tool use (Lefebvre and Bolhuis 2003). Yet

  18. SHORT COMMUNICATION Lowering sample size in comparative analyses can indicate a

    E-print Network

    Lindenfors, Patrik

    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

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

    E-print Network

    Schweik, Charles M.

    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

  20. SHORT COMMUNICATION Colorful displays signal male quality in a tropical anole lizard

    E-print Network

    Murphy, Troy G.

    during courtship and territory defense (Jenssen 1977). The dewlap is a signal of male fighting abilitySHORT COMMUNICATION Colorful displays signal male quality in a tropical anole lizard Ellee G. Cook important implications for individual fitness, yet it remains unclear whether such traits are signals

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

    E-print Network

    Gini, Giuseppina

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

  2. Short Communication Enhancement of CO2/CH4 selectivity in metal-organic frameworks containing

    E-print Network

    gas. Removal of CO2 from these gases is needed in order to reduce pipeline corrosion as wellShort Communication Enhancement of CO2/CH4 selectivity in metal-organic frameworks containing November 2010 Keywords: Lithium doping Carbon dioxide (CO2) Metal-organic framework (MOF) Separation

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

    E-print Network

    Chelidze, David

    Short communication Nonlinear analysis of gait kinematics to track changes in oxygen consumption of physical fatigue is a complex problem that cannot be solved easily by conventional biomechanical analysis. The purpose of the study was to determine if two nonlinear analysis methods can address the fundamental issue

  4. Short Communication Non-universal roughening of kinetic self-affine interfaces

    E-print Network

    Paris-Sud XI, Universit de

    2129 Short Communication Non-universal roughening of kinetic self-affine interfaces Yi-Cheng Zhang phase ad- vances into the other under a driving force a kinetic interface is created. Kinetic interfaces displacement in porous media and bacteria colony growth are considered as realizations of the Eden interfaces

  5. Short Communications FID gas chromatogram from LC-GC clean-up and analysis of the

    E-print Network

    Zare, Richard N.

    Short Communications Figure 2 FID gas chromatogram from LC-GC clean-up and analysis of the same PAH standard mixture as in Figure 1, obtained after 6 months daily use of the epoxy-glued interface. The gluing been sealed by melting. The other end of the fused silica tubing was connected directly to the LC pump

  6. SHORT COMMUNICATION Evaluation of non-ionic and zwitterionic detergents as membrane protein solubilizers

    E-print Network

    Paris-Sud XI, Universit de

    1 SHORT COMMUNICATION Evaluation of non-ionic and zwitterionic detergents as membrane protein plantes, place Viala, 34060 Montpellier cedex 1, France Running title: detergents for 2D electrophoresis;2 SUMMARY The solubilizing power of various nonionic and zwitterionic detergents as membrane protein

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

    E-print Network

    Bae, Jin-Woo

    Short communication Metatranscriptome analysis of lactic acid bacteria during kimchi fermentation microbial diversity and biological activity during the fermentation of kimchi, a traditional Korean. Metagenomic analysis revealed 23 LAB related to kimchi fermentation [defined as bacteria with more than a 1

  8. Short communication The effect of an ant-hemipteran mutualism on the coffee berry

    E-print Network

    Short communication The effect of an ant-hemipteran mutualism on the coffee berry borer on the main coffee pest in the region, Hypothenemus hampei, the coffee berry borer (CBB), was investigated on coffee berries. This study indicates that the mutualistic relationship between Azteca ants

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

    E-print Network

    Jiang, ChuanLi

    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

  10. Short communication Wetting transition in a three-component surfactant system

    E-print Network

    Paris-Sud XI, Universit de

    1821 Short communication Wetting transition in a three-component surfactant system M. Robert and J the interface between the excess water and the excess oil phases, while below Tw it does not. J. Ph1ls. France in a mixture of cyclohexane and methanol [3a], as well as in a few other mix- tures [3b]. In spite of its

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

    E-print Network

    Mahmud, Syed Masud

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

  12. SHORT COMMUNICATION NEW MATERIAL OF CHELUS COLOMBIANA (TESTUDINES; PLEURODIRA) FROM THE

    E-print Network

    Bermingham, Eldredge

    SHORT COMMUNICATION NEW MATERIAL OF CHELUS COLOMBIANA (TESTUDINES; PLEURODIRA) FROM THE LOWER MIOCENE OF COLOMBIA EDWIN CADENA,*,1 CARLOS JARAMILLO,1 and MARIA E. PARAMO2 ; 1 Center for Tropical Instituto Colombiano de Geologa y Minera, Museo Geolgico Jos Royo y Gomez, Bogot, Colombia

  13. Short communication Measuring pressure in the source region for geysers, Geyser

    E-print Network

    Manga, Michael

    Short communication Measuring pressure in the source region for geysers, Geyser Valley, Kamchatka: Received 18 June 2013 Accepted 31 July 2013 Available online 13 August 2013 Keywords: Geyser Overpressure Hydrothermal explosion Geothermal systems Liquid water and steam that erupt at geysers are provided from deeper

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

    E-print Network

    Gunawardena, Jeremy

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

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

    E-print Network

    Brandsma, Theo

    - 1 - SHORT COMMUNICATION Sea level pressure observations from Dutch ships 1854-1938 incorporated of the 5.7 million punched sea level pressure observations from Dutch ships 1854-1938 has been under debate with the help of original meteorological ship logs. It is concluded that the Dutch procedure for pressure

  16. Short Communication In Vivo Binding of Protoporphyrin IX to

    E-print Network

    Shen, Jun

    -aminolevulinic acid; porphyria ABSTRACT In vitro experiments have shown that protoporphyrin IX (PPIX) binds an insignificant percentage of TSPOs, it does reach high-enough concentrations in porphyria to occupy and have

  17. Short communication: study on veterinarian communication skills preferred and perceived by dairy farmers.

    PubMed

    Cipolla, M; Zecconi, A

    2015-04-01

    Effective communication in dairy farms improves management and herd health, and it is also pivotal for public health in a "from farm to fork" perspective. This paper reports the results of a descriptive study on dairy farmers' perception of veterinarian and other consultants' communication skills. Perceived communication skills showed to be significantly lower than desired ones for all the professional figures considered. Despite these unsatisfactory results, veterinarian were the most appreciated and skilled consultants. The observed farmers' dissatisfaction increases farmers' difficulties in identifying proper targets and proper consultant. An increase in the skill of veterinarian to deliver effective and tailored messages could help to overcome the problem. PMID:25744431

  18. Monolithically integrated quantum dot optical modulator with Semiconductor optical amplifier for short-range optical communications

    NASA Astrophysics Data System (ADS)

    Yamamoto, Naokatsu; Akahane, Kouichi; Umezawa, Toshimasa; Kawanishi, Tetsuya

    2015-04-01

    A monolithically integrated quantum dot (QD) optical gain modulator (OGM) with a QD semiconductor optical amplifier (SOA) was successfully developed. Broadband QD optical gain material was used to achieve Gbps-order high-speed optical data transmission, and an optical gain change as high as approximately 67 dB was obtained with a low OGM voltage of 2.0 V. Loss of optical power due to insertion of the device was also effectively compensated for by the SOA section. Furthermore, it was confirmed that the QD-OGM/SOA device helped achieve 6.0-Gbps error-free optical data transmission over a 2.0-km-long photonic crystal fiber. We also successfully demonstrated generation of Gbps-order, high-speed, and error-free optical signals in the >5.5-THz broadband optical frequency bandwidth larger than the C-band. These results suggest that the developed monolithically integrated QD-OGM/SOA device will be an advantageous and compact means of increasing the usable optical frequency channels for short-reach communications.

  19. SHORT COMMUNICATION Circulating plasma testosterone during early neonatal

    E-print Network

    French, Jeffrey A.

    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. This has resulted in prairie voles becoming a premier model in which to study the neural and hormonal basis

  20. SHORT COMMUNICATION Complementary effect of natural and sexual selection

    E-print Network

    Schlupp, Ingo

    toxic hydrogen sulfide, we show that (a) fish from non-sulfidic sites (Poecilia mexicana) show high (Poecilia sulphuraria) experience low mortality (13 %) when transferred to non-sulfidic water. (b) Mate choice tests revealed that P. mexicana females exhibit a preference for conspecific males in non

  1. Journal of Power Sources 173 (2007) 550555 Short communication

    E-print Network

    Ceder, Gerbrand

    2007-01-01

    indicate that it is isostructural with -NaFeO2. Electrochemical test shows that the reversible capacity materials could lead to materials that have improved rate capability at high state of charge. Since ion such as Na+ [13,14]. Indeed, NaNi2/3Sb1/3O2 has been synthesized with a solid state process by V

  2. Journal of Power Sources 144 (2005) 141145 Short communication

    E-print Network

    2005-01-01

    , with a channel depth of 500 m. A gold layer was deposited on the stainless steel plate to prevent corrosion silicon wafer andceramicarenearlyelectricallyinsulated.Conductivityfor current collection fully depends in order to minimize the resistance re- quired in high power application. An alternative method

  3. High temperature, high density opacity measurements using short pulse lasers

    NASA Astrophysics Data System (ADS)

    Hoarty, D. J.; James, S. F.; Brown, C. R. D.; Williams, B. M.; Guymer, T.; Hill, M.; Morton, J.; Chapman, D.; Shepherd, R.; Dunn, J.; Brown, G.; Schneider, M.; Beiersdorfer, P.; Chung, H. K.; Harris, J. W. O.; Upcraft, L.; Smith, C. C.; Lee, R. W.

    2010-08-01

    Heating of thin foil targets by a high power laser at intensities of 1017 -1019W/cm2 has been studied as a method for producing high temperature, high density samples to investigate X-ray opacity and equation of state. The targets were plastic (parylene N) foils with a buried microdot of a sample material, which was either aluminium, germanium or a mixture of germanium and titanium mixture of germanium and titanium. L-shell and K-shell spectra were taken using crystal spectrometers recording onto film and an ultrafast X-ray streak camera coupled to a conical focussing crystal with a time resolution of 1ps. The conditions in the microdot were inferred by comparing the measured spectra to synthetic spectra produced by the time-dependent collisional-radiative (CR) models FLY and FLYCHK. The data were also compared to simulated spectra from a number of opacity codes assuming local thermodynamic equilibrium (LTE). Temperature and density gradients were taken into account in the comparisons. The sample conditions, inferred from the CR modelling using FLYCHK, were 800100eV and 1.50.5g/cc, in the germanium/titanium samples and 600+50/-150eV, 3-4g/cc in the pure germanium or aluminium samples. The higher densities were achieved by using a combination of long and short pulses to compress and heat the foils respectively. The experimental results and comparisons to predicted spectra are presented and discussed.

  4. Optical Communications for High-Altitude Platforms

    Microsoft Academic Search

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

    2010-01-01

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

  5. SHORT COMMUNICATION: An image processing approach to calibration of hydrometers

    NASA Astrophysics Data System (ADS)

    Lorefice, S.; Malengo, A.

    2004-06-01

    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.

  6. Short communication: Macrocyclic lactone residues in butter from Brazilian markets.

    PubMed

    Macedo, Fabio; Marsico, Eliane Teixeira; Conte-Jnior, Carlos Adam; Furtado, Leonardo de Almeida; Brasil, Taila Figueredo; Pereira Netto, Annibal Duarte

    2015-06-01

    Macrocyclic lactones (ML) are commonly used in drug formulations for the treatment of parasites in cattle. In Brazil, except for drugs (or formulations) with long-term (half-life) effects, ML are registered for use in bovines. Indiscriminate use of ML may result in the presence of residues in milk and dairy products due to their lipophilic properties and thermal stability. This study applied a method of liquid chromatography with fluorimetric detection, recently developed and validated for the determination of residues of abamectin, doramectin, ivermectin, and moxidectin in butter. The method was applied to 38 samples of commercial butter purchased in the metropolitan area of Rio de Janeiro, Brazil, between June and September 2013, analyzed in triplicate. Ivermectin was detected in 89.5% of the samples, with concentrations between 0.3 and 119.4g/kg; 76.3% of the samples contained doramectin (0.6 to 64.7g/kg) and 55.2% contained abamectin (0.7 to 4.5g/kg). Most butter samples (76.3%) contained residues of more than 1 ML; however, no residues of moxidectin were detected. The results showed a high incidence of the presence of avermectins in butter samples. Butter is not included in the Brazilian National Plan for Control of Residues and Contaminants in Animal Products. As ML residues concentrate in lipophilic compounds, butter and other fatty dairy products should be screened for the presence of ML residues. PMID:25864054

  7. Short Communication Molecular conservation of the mammalian leptin protein.

    PubMed

    Gabriel, J E; Lidani, K C F

    2015-01-01

    In this study, we comparatively assessed multiple sequences of the leptin protein from different animal species to establish new insights into conservation degree of biological sequences and evolutionary biology among mammals using computational biology tools. First, amino acid sequences of the leptin protein from Homo sapiens (human, P41159), Sus scrofa (wild pig, Q29406), Felis catus (domestic cat, Q29406), Rattus norvegicus (rat, P50596), and Mus musculus (mouse, P41160) were randomly searched in the high-quality annotated and non-redundant protein sequence database UniProtKB/Swiss-Prot. A dendogram showing the evolutionary relationships among specimens was constructed from the sequences of interest using the Mega 6.0 software with the neighbor-joining method. The resulting tree presenting the evolutionary relationships among specimens inferred from amino acid sequences of the leptin protein in mammals demonstrated 2 main branches: 1 cluster including the rat and mouse species (0.02) and a second cluster containing both wild pig and domestic cat species grouped in a sub-branch (0.04 and 0.06, respectively), linking them to the human sequence (0.08). These findings were reinforced by comparing estimates of evolutionary divergence among leptin sequences analyzed. Based on comparative analyses of multiple sequence alignments in the present study, there was a stronger conservation degree of the leptin protein in evolutionarily close species and several conservative changes along the sequences of interest, revealing information regarding the evolutionary biology among mammals. PMID:25729957

  8. Short communication

    Microsoft Academic Search

    ANDERS L. NIELSEN; POUL JRGENSEN; Greppi GianFranco; Enne Giuseppe; M. KOBAYASHI

    2003-01-01

    Fish landings in Porto Seguro, in the eastern Brazilian coast, were monitored from September 1997 to August 1999 to describe the predominant species caught, the catch per unit effort (CPUE) and patterns of yields according to depth and season. A total of 223.5 t from 352 fishing trips made by a fleet of 53 boats was monitored. The fishery is

  9. Comparison of high power short time flywheel storage systems

    Microsoft Academic Search

    H. Darrelmann

    1999-01-01

    Uninterruptible power supply (UPS) systems are supported mainly by batteries to cover short network breakdowns. The advantages of batteries in this application are their high degree of modularisation, low charging regime losses and not least their wide spread availability. Disadvantages are their weight, high maintenance costs and their high price if storage times of less than one minute are desired

  10. A short tutorial on network calculus. I. Fundamental bounds in communication networks

    Microsoft Academic Search

    Jean-Yves Le Boudec; Patrick Thiran

    2000-01-01

    Network calculus is a collection of results based on MinPlus algebra, which applies to deterministic queuing systems found in communication networks. It can be used, for example, to understand the computations for delays used in the IETF guaranteed service, why re-shaping delays can be ignored in shapers or spacer-controllers, a common model for schedulers, etc. This short tutorial presents the

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

    E-print Network

    Nacional de San Luis, Universidad

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

  12. Efficient High Performance Collective Communication for Distributed Memory Environments

    ERIC Educational Resources Information Center

    Ali, Qasim

    2009-01-01

    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

  13. High-Capacity Communications from Martian Distances

    NASA Technical Reports Server (NTRS)

    Williams, W. Dan; Collins, Michael; Hodges, Richard; Orr, Richard S.; Sands, O. Scott; Schuchman, Leonard; Vyas, Hemali

    2007-01-01

    High capacity communications from Martian distances, required for the envisioned human exploration and desirable for data-intensive science missions, is challenging. NASA s Deep Space Network currently requires large antennas to close RF telemetry links operating at kilobit-per-second data rates. To accommodate higher rate communications, NASA is considering means to achieve greater effective aperture at its ground stations. This report, focusing on the return link from Mars to Earth, demonstrates that without excessive research and development expenditure, operational Mars-to-Earth RF communications systems can achieve data rates up to 1 Gbps by 2020 using technology that today is at technology readiness level (TRL) 4-5. Advanced technology to achieve the needed increase in spacecraft power and transmit aperture is feasible at an only moderate increase in spacecraft mass and technology risk. In addition, both power-efficient, near-capacity coding and modulation and greater aperture from the DSN array will be required. In accord with these results and conclusions, investment in the following technologies is recommended:(1) lightweight (1 kg/sq m density) spacecraft antenna systems; (2) a Ka-band receive ground array consisting of relatively small (10-15 m) antennas; (3) coding and modulation technology that reduces spacecraft power by at least 3 dB; and (4) efficient generation of kilowatt-level spacecraft RF power.

  14. Delivering high speed communications into harsh environments

    SciTech Connect

    NONE

    2007-08-15

    For those who believe that information is power, extending an organization's knowledge base throughout the entire enterprise can not help but improve operations. Until recently, though, field operations were often left out of the loop, as extending high-bandwidth communications into harsh environments often proved impossible. The article, submitted by Optical Cable Corp., describes development of a tight-buffered fibre optic cable designed for harsh underground mining conditions. CONSOL has installed almost 100 miles of the cable across 10 different installations. 1 fig., 1 photo.

  15. High-performance computing and communications

    SciTech Connect

    Stevens, R.

    1993-11-01

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

  16. Small Signaling Peptides in Arabidopsis Development: How Cells Communicate Over a Short Distance

    PubMed Central

    Murphy, Evan; Smith, Stephanie; De Smet, Ive

    2012-01-01

    To sustain plants postembryonic growth and development in a structure of cells fixed in cell walls, a tightly controlled short distance cellcell communication is required. The focus on phytohormones, such as auxin, has historically overshadowed the importance of small peptide signals, but it is becoming clear that secreted peptide signals are important in cellcell communication to coordinate and integrate cellular functions. However, of the more than 1000 potential secreted peptides, so far only very few have been functionally characterized or matched to a receptor. Here, we will describe our current knowledge on how small peptide signals can be identified, how they are modified and processed, which roles they play in Arabidopsis thaliana development, and through which receptors they act. PMID:22932676

  17. Beam divergence changing mechanism for short-range inter-unmanned aerial vehicle optical communications.

    PubMed

    Heng, Kiang Huat; Zhong, Wen-De; Cheng, Tee Hiang; Liu, Ning; He, Yingjie

    2009-03-10

    The problems associated with using a single fixed beam divergence for short-range inter-unmanned aerial vehicle free-space optical communications are discussed. To overcome the problems, a beam divergence changing mechanism is proposed. Four different methods are then proposed to implement the beam divergence changing mechanism. The performance of these methods is evaluated in terms of transmission distance under adverse weather conditions. The results show that the performance is greatly improved when the beam divergence changing mechanism is used. PMID:19277090

  18. Short Communication: Diurnal Profiles of Conjugated Linoleic Acids and Trans Fatty Acids in Ruminal Fluid from Cows Fed a High Concentrate Diet Supplemented with Fish Oil, Linseed Oil, or Sunflower Oil

    Microsoft Academic Search

    J. J. Loor; K. Ueda; A. Ferlay; Y. Chilliard; M. Doreau

    2004-01-01

    Trans-18:1 and 18:2 isomer composition in ruminal fluid during the daily feeding cycle was examined in 3 cows fed a high concentrate diet (35:65) with 5% (DM basis) sunflower oil (SO), 5% linseed oil (LO), or 2.5% fish oil (FO) in a 3 3 Latin square with 3 4-wk periods. Grass hay and concentrate mixtures were fed at 0900,

  19. Flexural fatigue of short fiber reinforced high temperature thermoplastics

    SciTech Connect

    Yau, S.; Chou, T.W.

    1985-04-01

    Short fiber reinforced thermoplastics are gaining increasing importance in the development of composite technology. In this investigation, the studies focus on three types of short glass fiber reinforced thermoplastics: (1) polyetherimide (PEI), (2) polyethersulphone (PES), and (3) polyetheretherketone (PEEK). These matrices possess good resistance to aviation fluids and ability to withstand high temperatures up to 600/sup 0/F. Specimens were evaluated at room temperature and at elevated temperatures under both static and dynamic loads. Fatigue tests reported herein were performed on Krouse sheet bending fatigue machines, operating at 1750 cpm and a constant deflection mode. Fatigue data are presented in traditional S-N plots. 3 references, 5 figures.

  20. Emerging applications of high temperature superconductors for space communications

    Microsoft Academic Search

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

    1990-01-01

    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

  1. High Performance MPI-2 One-Sided Communication

    E-print Network

    Panda, Dhabaleswar K.

    High Performance MPI-2 One-Sided Communication over InfiniBand W. Jiang J. Liu H. Jin D. K. Panda W Conclusions & Future Work #12;Introduction MPI-2 One-Sided Communication Process Management MPI-I/O One) operations How can we design efficient and scalable MPI-2 one-sided communication by taking advantage

  2. EXPERIMENTAL ANALYSIS OF COMMUNICATIONS INTERFACES FOR HIGH-PERFORMANCE CLUSTERS

    E-print Network

    George, Alan D.

    EXPERIMENTAL ANALYSIS OF COMMUNICATIONS INTERFACES FOR HIGH-PERFORMANCE CLUSTERS Alan George throughput and two-way latency using several different software-based communications protocol interfaces-throughput communications. Secondly, new software protocol interfaces must be developed, and their use accepted and adopted

  3. Session Three: High-Risk Kids and Communication

    E-print Network

    65 Session Three: High-Risk Kids and Communication #12;66 SESSION THREE TOTAL TIME: 2 HOURS HIGH-RISK KIDS and COMMUNICATION MATERIALS NEEDED: Parent Handbooks Learner Outcomes: 1. Raise awareness about is similar. Next we will talk about why children develop as they do. #12;67 SESSION THREE HIGH-RISK KIDS

  4. Frequency domain detection strategies for short-range ultra-wideband communication systems

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2005-01-01

    In this paper, we propose a detection strategy for high rate short-range impulse radio ultra-wideband systems. The proposed detection scheme relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detection approach at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) multiuser detectors have been investigated and

  5. Frequency domain detectors for ultra-wideband communications in short-range systems

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2008-01-01

    In this paper, we propose an original detection scheme for high rate short-range impulse radio ultra-wideband systems. The proposed receiver relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detector at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) detection strategies have been investigated and compared

  6. Frequency domain multiuser detectors for ultra-wideband short-range communications

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2005-01-01

    In this paper, we propose an original multiuser detector for high rate short-range impulse radio ultra-wideband systems. The proposed receiver relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detector at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) detection strategies have been investigated and compared

  7. EMCCD Technology in High Precision Photometry on Short Timescales

    Microsoft Academic Search

    Niall Smith; Alan Giltinan; Aidan OConnor; Stephen ODriscoll; Adrian Collins; Dylan Loughnan; Andreas Papageorgiou

    2008-01-01

    We discuss the advantages and limitations of Electron Multiplying CCD technology in high precision photometry on short timescales,\\u000a with special emphasis on probing the smallest structures in active galactic jets. Factors external to the EMCCD, rather than\\u000a the architecture of the EMCCD itself, most often limit the precision of photometry that can be reached with groundbased observations.\\u000a Although EMCCDs can

  8. Embedding High Capacity Covert Channels in Short Message Service (SMS)

    Microsoft Academic Search

    M. Zubair Rafique; Muhammad Khurram Khan; Khaled Alghatbar; Muddassar Farooq

    2011-01-01

    \\u000a Covert Channels constitute an important security threat because they are used to ex-filtrate sensitive information, to disseminate\\u000a malicious code, and, more alarmingly, to transfer instructions to a criminal (or terrorist). This work presents zero day vulnerabilities\\u000a and weak-nesses, that we discovered, in the Short Message Service (SMS) protocol, that allow the embedding of high capacity\\u000a covert channels. We show that

  9. SHORT COMMUNICATION Ultra-high-throughput microbial community analysis

    E-print Network

    Fierer, Noah

    Seq platforms J Gregory Caporaso1 , Christian L Lauber2 , William A Walters3 , Donna Berg-Lyons2 , James Huntley7 , Jack A Gilbert6,8 , Geoff Smith7 and Rob Knight9,10 1 Department of Computer Science, Northern for widespread use in microbial community analy- sis, such as by the Earth Microbiome Project (Gilbert et al

  10. Iridium: Global OTH data communications for high altitude scientific ballooning

    NASA Astrophysics Data System (ADS)

    Denney, A.

    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.

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

    PubMed

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

    2006-01-01

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

  12. Analysis of High Power IGBT Short Circuit Failures

    SciTech Connect

    Pappas, G.

    2005-02-11

    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.

  13. High charge short electron bunches for wakefield accelerator structures development.

    SciTech Connect

    Conde, M. E.

    1998-09-25

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

  14. High-Latitude Communications Satellite (HILACS)

    NASA Technical Reports Server (NTRS)

    1990-01-01

    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.

  15. High performance quantum communication without quantum memories

    NASA Astrophysics Data System (ADS)

    Munro, William J.; Nemoto, Kae

    2014-10-01

    We present the pipe-lined design of a quantum communications network that neither requires the establishment of entanglement between remote locations nor the use of quantum memories. It can be shown that the rate at which quantum data can be transmitted through the network is only limited by the time required to perform efficient local gate operations. This packet switched scheme therefore has the potential to provide higher communications rates than previously thought possible.

  16. SHORT COMMUNICATIONS Jours a! of Wild1 fe Diseases, 32(1). 1996, pp. 105-108

    E-print Network

    for osteo- arthritis, osteoporosis, periodontal disease, and other bone abnormalities. Osteoporotic lesionsSHORT COMMUNICATIONS Jours a! of Wild1 fe Diseases, 32(1). 1996, pp. 105-108 C Wildlife Disease As 106 JOURNAL OF WILDLIFE DISEASES, VOL. 32, NO. 1, JANUARY 1996 FIGuRE 1. Prevalence of osteoporotic

  17. SHORT COMMUNICATION The utility of ITS2 in spider phylogenetics: notes on prior work and an example from Anelosimus

    E-print Network

    Agnarsson, Ingi

    SHORT COMMUNICATION The utility of ITS2 in spider phylogenetics: notes on prior work and an example of spiders. Here, I examine the potential utility of this marker for spider phylogenetics based on preliminary data for Anelosimus spiders and a brief summary of prior work. The secondary structure of ITS2

  18. Single photon detection for high bit rate quantum communication

    Microsoft Academic Search

    J. F. Dynes; Z. L. Yuan; A. W. Sharpe; A. R. Dixon; A. J. Shields

    2011-01-01

    Quantum communication, in particular, quantum key distribution (QKD) is moving ever closer to real world implementation. However, for successful QKD system deployment, the QKD system components must be robustly designed and feature highly reliable operation. In this paper we focus on one important aspect of any quantum communication system: the single photon detector. In particular our interest is centered upon

  19. A Protocol Structure for High-speed Communication over

    E-print Network

    Haas, Zygmunt J.

    is to investigate the various possibilities of improving the performance of communications protocols and interfaces in general and the implementation of network interfaces in particular. In other words, the CPU per- formsA Protocol Structure for High-speed Communication over Broadband ISDN Zygrnunt Haas he transmission

  20. Gateway between high-performance Fieldbus and serial communication

    Microsoft Academic Search

    Sung Su Yoon; Jea Chul Lee; Seong Jin Cho; Jae Wook Jeon

    2010-01-01

    In this paper, we present a design of a gateway system to adapt the family of industrial computer network protocols used for real-time distributed control (Fieldbus) and the traditional serial communication. This gateway is designed to receive the data frame of Fieldbus and send the transferred data via serial communication. The proposed gateway can combine the properties of the high

  1. High Temperature Mineral Formation by Short Circuits in Protoplanetary Disks

    NASA Astrophysics Data System (ADS)

    Hubbard, Alexander

    Meteoritic chondrules represent over 20% of the mass of the most primitive Solar System rocks. Their formation requires rapid heating to temperatures of around 1800 K, followed by cooling at rates of around 1000 K/hour, far slower than the free-space cooling time of such millimeter-sized objects. Identifying the mechanism for this ubiquitous heating and cooling has remained a problem for over a century. Similar high- temperature minerals have been identified in interplanetary dust of cometary origin, and observed transitions from amorphous to crystalline silicate suggest high-temperature processing of dust in other protoplanetary disks. The short circuit instability that we have recently discovered intermittently heats protoplanetary disks, producing thin sheets hot enough to satisfy these constraints. We propose to determine the role of this instability in mineral formation in protoplanetary disks. Melting a large fraction of the solids in a protoplanetary disk requires a substantial source of energy. The short-circuit instability can tap the huge reservoir contained in the differential rotation of the disk. Protoplanetary disks must have a viscosity far exceeding molecular viscosity to accrete gas at the rates observed in young stellar objects. The most likely source of this viscosity is magnetized turbulence driven by the magnetorotational instability (MRI) wherever the disk is adequately ionized. Magnetized turbulence quite generally forms spatially and temporally intermittent current sheets that dissipate the magnetic energy as heat. These can raise the gas temperature locally well beyond its volume average. If temperatures reach 1000 K, gas resistivity starts to fall sharply as alkali metals are thermally ionized. Over the range from 1000 K to 2000 K, the resistivity decreases by more than 5 orders of magnitude. In that temperature range, the resistive evolution of the magnetic field is dominated by the spatial variation in the resistivity. Similarly to electrical short circuits and lightning, the electrical currents in the disk concentrate in hot, high conductivity regions, leading to strong resistive heating in narrow sheets. We have demonstrated that this instability can occur in protoplanetary disks, even in the presence of radiative cooling. In some cases the gas in our models reaches temperatures high enough to form chondrules and other similar minerals. We propose to find the gas and grain temperatures reached in current sheets drawn directly from MRI turbulence. We will use large-scale models of current sheet formation by the MRI to set the stage for small-scale models of individual current sheets. The MRI models will use the Pencil Code to characterize current sheets in stratified, shearing-box simulations without temperature dependent resistivity, and in higher-resolution, unstratified simulations with it. To improve our modeling of the gas resistivity and the MRI we will use a chemical equilibrium code to calculate the ionization fraction in protoplanetary disks: the alkali metals can be locked away in solid minerals, preventing their thermal ionization. Together these models will provide the initial and boundary conditions for simulations of individual current sheets using a purpose-built implicit code including radiative transfer as well as temperature-dependent resistivity. Histories of the gas temperature and pressure, and the ambient radiation, sampled using Lagrangian tracer particles, will allow us to use the equilibrium condensation code to compare the experience of solids in our simulations with experimental constraints on chondrules and other high-temperature minerals. This will allow us to test our hypothesis that the short circuit instability can produce grain thermal histories consistent with experimental and observational constraints on the ensemble of high-temperature minerals in our own and external disks.

  2. High power, high efficiency millimeter wavelength traveling wave tubes for high rate communications from deep space

    Microsoft Academic Search

    James A. Dayton Jr.

    1991-01-01

    The high-power transmitters needed for high data rate communications from deep space will require a new class of compact, high efficiency traveling wave tubes (TWT's). Many of the recent TWT developments in the microwave frequency range are generically applicable to mm wave devices, in particular much of the technology of computer aided design, cathodes, and multistage depressed collectors. However, because

  3. High speed integrated electronics for communications systems

    Microsoft Academic Search

    JOSEPH E. BERTHOLD

    1990-01-01

    The functions necessary in broadband communications systems at speeds above 50 Mb\\/s are discussed. The types of components and functionality that are needed for access to networks and for the transmission and routing of traffic within networks are identified. Integrated circuit components used for customer-network access, network multiplexing, and switching are reviewed. It is shown that currently available digital VLSI

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

    NSDL National Science Digital Library

    1997-01-01

    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.

  5. Bandwidth Efficient Turbo Coding For High Speed Mobile Satellite Communications

    Microsoft Academic Search

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

    1997-01-01

    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

  6. Multimethod communication for high-performance metacomputing applications

    SciTech Connect

    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

    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.

  7. Optical communication demonstration and high-rate link facility

    NASA Astrophysics Data System (ADS)

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

    1999-01-01

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

  8. A high current, short pulse electron source for wakefield accelerators

    SciTech Connect

    Ho, Ching-Hung.

    1992-01-01

    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.

  9. A high current, short pulse electron source for wakefield accelerators

    SciTech Connect

    Ho, Ching-Hung

    1992-12-31

    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.

  10. Short Communication: Atmospheric moisture transport, the bridge between ocean evaporation and Arctic ice melting

    NASA Astrophysics Data System (ADS)

    Gimeno, L.; Vzquez, M.; Nieto, R.; Trigo, R. M.

    2015-06-01

    If we could choose a region where the effects of global warming are likely to be pronounced and considerable, and at the same time one where the changes could affect the global climate in similarly asymmetric way with respect to other regions, this would unequivocally be the Arctic. The atmospheric branch of the hydrological cycle lies behind the linkages between the Arctic system and the global climate. Changes in the atmospheric moisture transport have been proposed as a vehicle for interpreting the most significant changes in the Arctic region. This is because the transport of moisture from the extratropical regions to the Arctic has increased in recent decades, and is expected to increase within a warming climate. This increase could be due either to changes in circulation patterns which have altered the moisture sources, or to changes in the intensity of the moisture sources because of enhanced evaporation, or a combination of these two mechanisms. In this short communication we focus on the assessing more objectively the strong link between ocean evaporation trends and Arctic Sea ice melting. We will critically analyze several recent results suggesting links between moisture transport and the extent of sea-ice in the Arctic, this being one of the most distinct indicators of continuous climate change both in the Arctic and on a global scale. To do this we will use a sophisticated Lagrangian approach to develop a more robust framework on some of these previous disconnect ng results, using new information and insights. Among the many mechanisms that could be involved are hydrological (increased Arctic river discharges), radiative (increase of cloud cover and water vapour) and meteorological (increase in summer storms crossing the Arctic, or increments in precipitation).

  11. NASA High Performance Computing and Communications program

    NASA Technical Reports Server (NTRS)

    Holcomb, Lee; Smith, Paul; Hunter, Paul

    1994-01-01

    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.

  12. NASA high performance computing and communications program

    NASA Technical Reports Server (NTRS)

    Holcomb, Lee; Smith, Paul; Hunter, Paul

    1993-01-01

    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.

  13. Acquisition of packets with a short preamble for direct-sequence spread-spectrum multiple-access packet communications

    Microsoft Academic Search

    Yeon K. Jeong; James S. Lehnert

    2003-01-01

    Traditional methods for the acquisition of packets use the a priori information contained in the preamble, which is located at the start of each packet. For spread-spectrum systems such as a direct-sequence spread-spectrum packet communication, the preamble consists of a short period of known code sequence and the code sequence continues until the end of the packet, i.e., the information

  14. Quantum data locking for high-rate private communication

    NASA Astrophysics Data System (ADS)

    Lupo, Cosmo; Lloyd, Seth

    2015-03-01

    We show that, if the accessible information is used as a security quantifier, quantum channels with a certain symmetry can convey private messages at a tremendously high rate, as high as less than one bit below the rate of non-private classical communication. This result is obtained by exploiting the quantum data locking effect. The price to pay to achieve such a high private communication rate is that accessible information security is in general not composable. However, composable security holds against an eavesdropper who is forced to measure her share of the quantum system within a finite time after she gets it.

  15. Transport System Architectures for High-Performance Communications Subsystems

    E-print Network

    Schmidt, Douglas C.

    -conferencing. These applications possess quality-of-service requirements that are 1A transport system consists of protocol management), and hardware devices (such as high-speed network adapters) that support distributed applicationsTransport System Architectures for High-Performance Communications Subsystems Douglas C. Schmidt

  16. BLINK: A High Throughput Link Layer for Backscatter Communication

    E-print Network

    Ganesan, Deepak

    BLINK: A High Throughput Link Layer for Backscatter Communication Pengyu Zhang, Jeremy Gummeson for continuous and high-volume sensor data transfer. To address this need, we describe a novel link layer prior specific permission and/or a fee. MobiSys'12, June 2529, 2012, Low Wood Bay, Lake District, UK

  17. Evaluating high performance communication: a power perspective

    Microsoft Academic Search

    Jiuxing Liu; Dan E. Poff; Blent Abali

    2009-01-01

    Recently, high speed interconnects capable of remote direct memory access (RDMA) such as InfiniBand and iWARP have gained considerable popularity due to their superb latency and bandwidth. Most existing studies about RDMA have focused mainly on its performance aspect. However, as power management has become essential for high-end systems such as enterprise servers and high performance computing nodes which are

  18. High-altitude platforms for wireless communications

    Microsoft Academic Search

    T. C. Tozer; D. Grace

    2001-01-01

    The demand for high-capacity wireless services is bringing increasing challenges, especially for delivery of the'last mile'. Terrestrially, the need for line-of-sight propagation paths represents a constraint unless very large numbers of base-station masts are deployed, while satellite systems have capacity limitations. An emerging solution is offered by high-altitude platforms (HAPs) operating in the stratosphere at altitudes of up to 22

  19. Inverse multiplexing in short-range multi-transport wireless communications

    Microsoft Academic Search

    James C. Funk; Heidi R. Duffin; Lichen Dai; Charles D. Knutson

    2003-01-01

    This paper describes a mechanism for utilizing inverse multiplexing to significantly increase the bandwidth available to short-range wireless devices. Previous work with inverse multiplexing has focused on wired networks; its implementation with short-range wireless transports introduces heterogeneity in the links, which must be taken into account. A mathematical model for an inverse multiplexing system is derived for several scheduling algorithms.

  20. High Bandwidth Communications: 2000-2004

    NASA Technical Reports Server (NTRS)

    2004-01-01

    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.

  1. High-energy ion generation in interaction. of short laser pulse with high-density plasma

    Microsoft Academic Search

    Y. Sentoku; V. Y. Bychenkov; K. Flippo; A. Maksimchuk; K. Mima; G. Mourou; Z. M. Sheng; D. Umstadter

    2002-01-01

    . Multi-MeV ion production from the interaction of a short laser pulse with a high-density plasma, accompanied by an underdense\\u000a preplasma, has been studied with a particle-in-cell simulation and good agreement is found with experiment. The mechanism\\u000a primarily responsible for the acceleration of ions is identified. Comparison with experiments sheds light on the ion-energy\\u000a dependence on laser intensity, preplasma scale

  2. Stagings: Short Scripts for Middle and High School Students.

    ERIC Educational Resources Information Center

    Garner, Joan

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

  3. Short Term Effects of Highly and Mildly Aggressive Video Games

    Microsoft Academic Search

    Craig A. Anderson; Catherine M. Ford

    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

  4. Some interruption criteria for short high-frequency vacuum arcs

    Microsoft Academic Search

    M. Glinkowski; A. Greenwood

    1989-01-01

    If the contacts of a vacuum interrupter open shortly before a current zero, the transient recovery voltage (TRV) can cause a reignition and reestablish the arc. When the current in a diffuse vacuum arc passes through zero, there is a distinct pause before the TRV builds up (approximately 40 ns for copper). During this pause the gap carries conduction current

  5. Overlapped discrete multitone modulation for high speed copper wire communications

    Microsoft Academic Search

    Stuart D. Sandberg; Michael A. Tzannes

    1995-01-01

    Multicarrier modulation possesses several properties which make it an attractive approach for high speed copper wire communication networks. Among these properties are the ability to efficiently access and distribute multiplexed data streams, and a reduced susceptibility to impulsive, as well as to narrowband channel disturbances. In digital implementations of multicarrier modulation, subcarrier generation and data modulation are accomplished digitally using

  6. Overlapped Discrete Multitone Modulation for High Speed Copper Wire Communication

    Microsoft Academic Search

    Stuart D. Sandberg; Michael A. Tzannes

    1995-01-01

    Multicarrier modulation possesses several properties which make it an attractive approach for high speed copper wire communications networks. Among these properties are the ability to efficiently access and distribute multiplexed data streams, and a reduced susceptibility to impulsive, as well as to narrowband channel disturbances. In digital implementations of multicarrier modulation, subcarrier generation and data modulation are accomplished digitally using

  7. A Family Drama Workshop: Communications Seminar for High School Students.

    ERIC Educational Resources Information Center

    Stanton, Timothy; Sheiner, Michaele

    This paper was written for high school teachers and other youth workers, who are looking for effective ways to support and assist adolescents as they deal with their complex, and often painful, changing family relationships. It describes A Family Drama Workshop, a series of seminars on families and communication, which was developed and presented

  8. Lightpath communications: an approach to high bandwidth optical WAN's

    Microsoft Academic Search

    Imrich Chlamtac; Aura Ganz; Gadi Karmi

    1992-01-01

    An architectural approach that meets high bandwidth requirements by introducing a communication architecture based on lightpaths, optical transmission paths in the network, is introduced. Since lightpaths form the building block of the proposed architecture, its performance hinges on their efficient establishment and management. It is shown that although the problem of optimally establishing lightpaths is NP-complete, simple heuristics provide near

  9. Ultra-Wideband Technology for Short or Medium-Range Wireless Communications

    Microsoft Academic Search

    Jeff Foerster; Evan Green; Srinivasa Somayazulu; David Leeper

    2001-01-01

    Ultra-Wideband (UWB) technology is loosely defined as any wireless transmission scheme that occupies a bandwidth of more than 25% of a center frequency, or more than 1.5GHz. The Federal Communications Commission (FCC) is currently working on setting emissions limits that would allow UWB communication systems to be deployed on an unlicensed basis following the Part 15.209 rules for radiated emissions

  10. Communication.

    ERIC Educational Resources Information Center

    Strauss, Andre

    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,

  11. DOMAIN SPECIFIC RECONFIGURABLE ARCHITECTURE OF TURBO DECODER OPTIMIZED FOR SHORT DISTANCE WIRELESS COMMUNICATION

    E-print Network

    Arslan, Tughrul

    DOMAIN SPECIFIC RECONFIGURABLE ARCHITECTURE OF TURBO DECODER OPTIMIZED FOR SHORT DISTANCE WIRELESS Kingdom Abstract: This paper describes low power, reconfigurable architectures for Turbo Decoder. Currently most of the reconfigurable solutions in research target reconfiguration between different

  12. Minimum energy per bit in high bit rate optical communications and quantum communications

    NASA Astrophysics Data System (ADS)

    Gallion, P.; Mendieta, F. J.

    2011-05-01

    Optical direct detection usually operates far above the quantum limit, due to the high thermal noise level of PIN photodiodes. For signal energy at the quantum level, the thermal effects in photon counters are also a strong limitation. The optical amplification or the heterodyne detection of the 2 quadratures of the field, widely used in high bit rate and long haul optical systems, overcome this limitation at the expense of a minimum 3db noise figure. By allowing a noise free mixing gain, as well as single quadrature measurements, the balanced homodyne receiver is allowed to reach quantum noise limited operation. The aim of this paper is to review the different quantum receiver implementations and to compare the minimum signal energy required to achieve a given bit error rate, or a given bit erasure rate, in high bit rate communications and quantum communications. Application to quantum cryptography will be also addressed.

  13. High-Field Quasiballistic Transport in Short Carbon Nanotubes

    Microsoft Academic Search

    Ali Javey; Jing Guo; Magnus Paulsson; Qian Wang; David Mann; Mark Lundstrom; Hongjie Dai

    2004-01-01

    Single walled carbon nanotubes with Pd Ohmic contacts and lengths ranging from several microns down to 10nm are investigated by electron transport experiments and theory. The mean-free path (MFP) for acoustic phonon scattering is estimated to be lap300 nm, and that for optical phonon scattering is lop15 nm. Transport through very short (10 nm) nanotubes is free of significant acoustic

  14. High-energy ion generation by short laser pulses

    Microsoft Academic Search

    A. Maksimchuk; K. Flippo; H. Krause; G. Mourou; K. Nemoto; D. Shultz; D. Umstadter; R. Vane; V. Yu. Bychenkov; G. I. Dudnikova; V. F. Kovalev; K. Mima; V. N. Novikov; Y. Sentoku; S. V. Tolokonnikov

    2004-01-01

    This paper reviews the many recent advances at the Center for Ultrafast Optical Science (CUOS) at the University of Michigan\\u000a in multi-MeV ion beam generation from the interaction of short laser pulses focused onto thin foil targets at intensities\\u000a ranging from 1017 to 1019 W\\/cm2. Ion beam characteristics were studied by changing the laser intensity, laser wavelength, target material, and

  15. Short communication articles published in BJOMS during 2008-2009--an analysis of types of submission and subject material.

    PubMed

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

    2010-04-01

    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 of medical knowledge, and with increasing pressure for space in paper publications, many journals now limit them to online publication only. We evaluated all 142 short communications published in BJOMS during 2008/2009. Most (87%) were single case reports, and they covered virtually the whole remit of the specialty. There were also 14 formal studies that included two laboratory-based research projects; these were excluded from the analysis. We used established criteria to assess the possible educational value of each publication, and found that 61/128 papers (48%), while interesting and informative, probably added little to existing knowledge. The remaining papers described new or unreported cases, rare or unexpected outcomes, and adverse effects or complications of treatment. We discuss the possible implications of this study for readers of BJOMS and for the journal itself. PMID:20153571

  16. Discovery of Short Peptides Exhibiting High Potency against Cryptococcus neoformans

    PubMed Central

    2014-01-01

    Rapid increase in the emergence of resistance against existing antifungal drugs created a need to discover new structural classes of antifungal agents. In this study we describe the synthesis of a new structural class of short antifungal peptidomimetcis, their activity, and plausible mechanism of action. The results of the study show that peptides 11e and 11f are more potent than the control drug amphotericin B, with no cytotoxicity to human cancer cells and noncancerous mammalian kidney cells. The selectivity of peptides to fungus is depicted by transmission electron microscopy studies, and it revealed that 11e possibly disrupts the model membrane of the fungal pathogen. PMID:24900833

  17. Short communication Microsite differences in fungal hyphal length, glomalin, and soil

    E-print Network

    Rilli, Matthias C.

    by arbuscular mycorrhizal fungi (AMF) that plays an important role in structuring soil. We quantified soil in structuring soil is glomalin, a glypoprotein produced by hyphae of arbuscular mycorrhizal fungi (AMFShort communication Microsite differences in fungal hyphal length, glomalin, and soil aggregate

  18. Short Communication A new crosscoupling in smectic C* liquid crystals near the transition

    E-print Network

    Paris-Sud XI, Universit de

    the transition to the A phase the dynamics, which couples the order parameter modulus to the hydrodynamic degrees. In this communication however, we want to concentrate on a very interesting aspect of the dynamics of the smectic C, i.e. choosing as hydrodynamic variable the rotation of the c -vector (the projection of the director

  19. Short communication: Automatic detection of social competition using an electronic feeding system.

    PubMed

    Huzzey, J M; Weary, D M; Tiau, B Y F; von Keyserlingk, M A G

    2014-05-01

    The objective of this study was to determine if data derived from a system that electronically monitors feeding behavior could be used to identify competitive interactions of dairy cows at the feed bunk. A short interval between successive feeding events of 2 cows at 1 feed bin was predicted to be associated with a competitive replacement: when one cow displaced a feeding cow and then took her position at the bin. To identify the interval between feeding events that best predicted these replacement events, the feeding activity of 5 Holstein dairy cows was monitored using an electronic feeding system and video recordings. The number of times a cow was replaced at the feed bunk over 3 consecutive 24-h periods was determined using video analysis and these events were paired with the corresponding feeding events recorded by an electronic feeding system (Roughage Intake Control system; Insentec B.V., Marknesse, the Netherlands). A pooled analysis of all 5 cows showed that the optimal interval for predicting replacements at the feed bunk was 26s (sensitivity=86% and specificity=82%); this interval was termed the replacement criterion. This criterion was then applied to feeding data from a sample of 24 independent Holstein dairy cows, each observed for 3d during the week following calving. Video had previously been used to measure the number of times each cow was an actor and reactor of a displacement (when one cow displaced a feeding cow but did not necessarily take her position at the bin). Despite the differences in measures, the number of replacements (as estimated by our algorithm) was positively correlated with the number of displacements [as measured using video; correlation coefficient (r)=0.63 as actor, r=0.69 as reactor]. Estimates of an index of success in competitive interactions (number of times actor/number of times actor = number of times reactor) generated using the 2 methods were highly correlated (r=0.94). These results suggest that competitive behavior at the feed bunk can be automatically quantified using data derived from an electronic feeding system. PMID:24630661

  20. High performance computing and communications: FY 1996 implementation plan

    SciTech Connect

    NONE

    1995-05-16

    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.

  1. Slotted ALOHA for High-Capacity Voice Cellular Communications

    Microsoft Academic Search

    Michele Zorzi; Silvano Pupolin

    1994-01-01

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

  2. High-power diode lasers for space communications - A review

    Microsoft Academic Search

    D. Botez

    1988-01-01

    A development status evaluation is presented for high power, 50-1000 mW diode lasers applicable to space communications; attention is given to current and prospective capabilities of monolithic single-element and few-element devices constituting phase-locked arrays, as well as to various more-than-10-element phase-locked arrays. Nonabsorbing mirror structures are employed to preclude facet degradation. Also noted are the prospects for development of hybrid

  3. High-repetition-rate solid state laser for space communications

    Microsoft Academic Search

    Christian Larat; Muriel Schwarz; Jean-Paul Pocholle; Gilles Feugnet; Michel R. Papuchon

    1995-01-01

    The CNES (Centre National d'Etudes Spatiales, French space agency) established the laser system characteristics for Mars-Earth spatial communications using the Pulse Position Modulation technique. Today, diode-pumped solid-state lasers are under intense research and development. Indeed, in comparison with flash-lamp pumped laser, they offer significant advantages in terms of efficiency, compactness, lifetime and high beam quality. We have demonstrated that gain-switch

  4. New indoor high-speed radio communication system

    Microsoft Academic Search

    Kazuhiro Uehara; Tomohiro Seki; Kenichi Kagoshima

    1995-01-01

    We propose a new concept for indoor high-speed radio communication includes a no-wiring relay station (RS) on the ceiling. The concept offers very simple set up procedures, and flexibility in composing and adjusting radio zones. We introduce a prototype of the RS, which operates using the voltage supplied to standard fluorescent sockets. Planar multibeam and pencil-beam array antennas for the

  5. High-speed satellite mobile communications: technologies and challenges

    Microsoft Academic Search

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

    2004-01-01

    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

  6. Low Cost Cryocoolers for High Temperature Superconductor Communication Filters

    NASA Technical Reports Server (NTRS)

    Brown, Davina

    1998-01-01

    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.

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

    E-print Network

    California at Santa Cruz, University of

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

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

    E-print Network

    Harchol-Balter, Mor

    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

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

    E-print Network

    Tourio, Juan

    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

  10. PROJECT COMMUNICATIONS AS A CRITICAL SUCCESS FAC TOR IN HIGH TECHNOLOGY PROJECTS

    Microsoft Academic Search

    Mirja Peltoniemi; Tauno Jokinen; Jonna Mnkknen

    In authors' earlier study of success factors in high technology product development projects, project communication was identified to be essential to pro- ject success. In this paper the authors discuss about project communications management related concepts through a literature survey. Terms such as com- munication, communication management and project communication plan are covered. Finally, in concluding discussion it is presented

  11. Multiply-agile encryption in high speed communication networks

    SciTech Connect

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

    1997-05-01

    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.

  12. Java-based communication in a High Performance Computing environment

    NASA Astrophysics Data System (ADS)

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

    2011-02-01

    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.

  13. Emerging applications of high temperature superconductors for space communications

    NASA Technical Reports Server (NTRS)

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

    1990-01-01

    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.

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

    PubMed Central

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

    2014-01-01

    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. PMID:25685703

  15. Transport of short high-current electron bunches through bending magnet systems

    Microsoft Academic Search

    D. H. Dowell; P. G. O'Shea

    1997-01-01

    Short high-current microbunches are of considerable interest for future linear colliders and electron beam sources of coherent radiation such as x-ray free-electron lasers. In both cases the quality of the electron beam delivered to the interaction point is of critical importance. In recent years the there has been considerable interest in beam degradation associated with the transport of short high-current

  16. High ion charge states in a high-current, short-pulse, vacuum arc ion source

    SciTech Connect

    Anders, A.; Brown, I.; MacGill, R.; Dickinson, M.

    1995-09-01

    Ions of the cathode material are formed at vacuum arc cathode spots and extracted by a grid system. The ion charge states (typically 1--4) depend on the cathode material and only little on the discharge current as long as the current is low. Here the authors report on experiments with short pulses (several {micro}s) and high currents (several kA); this regime of operation is thus approaching a more vacuum spark-like regime. Mean ion charge states of up to 6.2 for tungsten and 3.7 for titanium have been measured, with the corresponding maximum charge states of up to 8+ and 6+, respectively. The results are discussed in terms of Saha calculations and freezing of the charge state distribution.

  17. Short-pulse, high-intensity lasers at Los Alamos

    SciTech Connect

    Taylor, A.J.; Roberts, J.P.; Rodriguez, G.; Fulton, R.D.; Kyrala, G.A.; Schappert, G.T.

    1994-03-01

    Advances in ultrafast lasers and optical amplifiers have spurred the development of terawatt-class laser systems capable of delivering focal spot intensities approaching 10{sup 20} W/cm{sup 2}. At these extremely high intensities, the optical field strength is more than twenty times larger than the Bohr electric field, permitting investigations of the optical properties of matter in a previously unexplored regime. The authors describe two laser systems for high intensity laser interaction experiments: The first is a terawatt system based on amplification of femtosecond pulses in XeCl which yields 250 mJ in 275 fs and routinely produces intensifies on target in excess of 10{sup 18} W/cm{sup 2}. The second system is based on chirped pulse amplification of 100-fs pulses in Ti:sapphire.

  18. Short Communication Vibration analysis and measurement of a gradient coil insert in a 4 T MRI

    Microsoft Academic Search

    G. Z. Yao; Chris K. Mechefske; Brian K. Rutt

    High speed switching of current in gradient coils within high magnetic field strength Magnetic Resonance Imaging (MRI) scanners may result in high acoustic sound pressure levels in and around these machines. Many studies have already been conducted to characterize the sound field in and around MRIs and various methods have been investigated to attenuate the noise generated. To characterize the

  19. A high gain antenna system for airborne satellite communication applications

    NASA Technical Reports Server (NTRS)

    Maritan, M.; Borgford, M.

    1990-01-01

    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.

  20. The Constitution of Highly Reliable Practices: Materializing Communication as Constitutive of Organizing

    E-print Network

    Spradley, Robert Tyler

    2012-10-19

    THE CONSTITUTION OF HIGHLY RELIABLE PRACTICES: MATERIALIZING COMMUNICATION AS CONSTITUTIVE OF ORGANIZING A Dissertation by ROBERT TYLER SPRADLEY Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY August 2012 Major Subject: Communication The Constitution of Highly Reliable Practices: Materializing Communication as Constitutive...

  1. High power microwave components for space communications satellite

    NASA Technical Reports Server (NTRS)

    Jankowski, H.; Geia, A.

    1972-01-01

    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.

  2. ISS Update: High Rate Communications System - Duration: 9 minutes, 26 seconds.

    NASA Video Gallery

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

  3. A short pulse, high rep-rate microdischarge VUV source

    NASA Astrophysics Data System (ADS)

    Stephens, Jacob; Fierro, Andrew; Dickens, James; Neuber, Andreas; Center for Pulsed Power; Power Electronics Team

    2013-09-01

    A MOSFET based high voltage pulser is utilized to excite a microdischarge (MD), or microdischarge array (MDA) with pulsed voltages of up to 1 kV, with risetime and FWHM on the order of 10 ns and 30 ns, respectively. Additionally, the pulser is capable of pulsing at rep-rates in excess of 35 MHz. However, for these experiments the rep-rate was set on the order of 1 MHz, so as to limit excess energy deposition into the background gas and optimize the energy efficiency of VUV generation. Using VUV capable spectral diagnostics, the VUV emission of the MDs for various pressures (50-800 + Torr) and gases, focused on argon, argon-hydrogen mixtures, and neon-hydrogen mixtures (all of which provide strong emission at ? < 130 nm) is studied, for pulsed, MHz rep-rated excitation. Using a photomultiplier tube the time dependent behavior of the VUV emission is characterized and compared to results from transient fluid modeling of the MDA. For instance, the MDA turn-on time is recorded to be about 15 ns, which matches the full plasma development time in the model, and the MDA self- capacitance largely determines the turn-off behavior. A MOSFET based high voltage pulser is utilized to excite a microdischarge (MD), or microdischarge array (MDA) with pulsed voltages of up to 1 kV, with risetime and FWHM on the order of 10 ns and 30 ns, respectively. Additionally, the pulser is capable of pulsing at rep-rates in excess of 35 MHz. However, for these experiments the rep-rate was set on the order of 1 MHz, so as to limit excess energy deposition into the background gas and optimize the energy efficiency of VUV generation. Using VUV capable spectral diagnostics, the VUV emission of the MDs for various pressures (50-800 + Torr) and gases, focused on argon, argon-hydrogen mixtures, and neon-hydrogen mixtures (all of which provide strong emission at ? < 130 nm) is studied, for pulsed, MHz rep-rated excitation. Using a photomultiplier tube the time dependent behavior of the VUV emission is characterized and compared to results from transient fluid modeling of the MDA. For instance, the MDA turn-on time is recorded to be about 15 ns, which matches the full plasma development time in the model, and the MDA self- capacitance largely determines the turn-off behavior. This research was supported by an AFOSR grant on the Physics of Distributed Plasma Discharges and fellowships from the National Physical Sciences Consortium, supported by Sandia National Laboratories.

  4. A UHF RFID system with on-chip-antenna tag for short range communication

    NASA Astrophysics Data System (ADS)

    Qi, Peng; Chun, Zhang; Xijin, Zhao; Zhihua, Wang

    2015-05-01

    A UHF RF identification system based on the 0.18 ?m CMOS process has been developed for short range and harsh size requirement applications, which is composed of a fully integrated tag and a special reader. The whole tag chip with the antenna takes up an area of 0.36 mm2, which is smaller than other reported tags with an on-chip antenna (OCA) using the standard CMOS process. A self-defined protocol is proposed to reduce the power consumption, and minimize the size of the tag. The specialized SOC reader system consists of the RF transceiver, digital baseband, MCU and host interface. Its power consumption is about 500 mW. Measurement results show that the system's reading range is 2 mm with 20 dBm reader output power. With an inductive antenna printed on a paper substrate around the OCA tag, the reading range can be extended from several centimeters to meters, depending on the shape and size of the inductive antenna.

  5. High performance computing and communications: FY 1995 implementation plan

    SciTech Connect

    NONE

    1994-04-01

    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.

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

    Microsoft Academic Search

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

    2008-01-01

    BACKGROUND: High-throughput sequencing technology is capable to identify novel short RNAs in plant species. We used Solexa sequencing to find new microRNAs in one of the model legume species, barrel medic (Medicago truncatula). RESULTS: 3,948,871 reads were obtained from two separate short RNA libraries generated from total RNA extracted from M. truncatula leaves, representing 1,563,959 distinct sequences. 2,168,937 reads were

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

    PubMed

    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

    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

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

    E-print Network

    Chong, Frederic T.

    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

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

    E-print Network

    Boyer, Edmond

    ferromagntique 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

  10. Short Communication A mitochondrial DNA based phylogeny of weakfish species of the Cynoscion group

    E-print Network

    Aguirre, Windsor E.

    or in deep ocean waters (e.g., Barez, 2001). The genus is highly valued as a human food source. Materials and methods Sample sizes and locations are listed in Table 1 and Fig. 1. Tissue samples were frozen in liquid nitrogen or were preserved in DMSO/EDTA buffer or 95% ethanol. Taxonomic sampling

  11. Short Communication Differential decomposition of arbuscular mycorrhizal fungal hyphae and glomalin

    Microsoft Academic Search

    Peter D. Steinberg; Matthias C. Rillig

    Arbuscular mycorrhizal fungi (AMF) are obligate symbionts of most higher plants. In addition to being a major component of soil microbial biomass, AMF hyphae produce glomalin, a recalcitrant glycoproteinaceous substance highly correlated with soil aggregate water stability. This study addresses the lack of knowledge concerning the decomposition of hyphae and glomalin. We used an experimental design that exploited the lack

  12. Short communication Glomalin production by an arbuscular mycorrhizal fungus: a mechanism of habitat modification?

    Microsoft Academic Search

    Matthias C. Rillig; Peter D. Steinberg

    We report on a novel mechanism by which arbuscular mycorrhizal fungi may be able to modify a sub-optimal growth environment to their advantage by secreting the glycoprotein glomalin, which is highly correlated with soil aggregate water stability. Here we used glass beads of different sizes to simulate different hyphal growing space conditions. With small beads (,106 mm; simulating a non-aggregated

  13. Short Communication Climatological radar delineation of urban convection for Atlanta, Georgia

    Microsoft Academic Search

    Mace L. Bentley; S. Ashley; J. Anthony Stallins

    The distribution of warm season (June through August) thunderstorm activity surrounding Atlanta, Georgia from 1997 to 2006 was determined utilizing composite reflectivity data obtained from the network of National Weather Service radars. The radar data, at 2 km and 5 min spatial and temporal resolutions, allows for high resolution analyses of urban convective trends when grid averaged over a 10-year

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

    E-print Network

    Rayment, Ivan

    the IMPACT system requires cleavage of the protein from the tag as an elution step, other systems require fusion proteins due to its high degree of specificity, its resistance to many protease inhibitors used of recombinant proteins from Escherichia coli C.J. Rocco a , K.L. Dennison b , Vadim A. Klenchin b , I. Rayment b

  15. Advanced modulation formats for high-performance short-reach optical interconnects.

    PubMed

    Hu, Qian; Che, Di; Wang, Yifei; Shieh, William

    2015-02-01

    The explosive growth of the traffic between data centers has led to an urgent demand for high-performance short-reach optical interconnects with data rate beyond 100G per wavelength and transmission distance over hundreds of kilometers. Since direct detection (DD) provides a cost-efficient solution for short-reach interconnects, various advanced modulation formats have been intensively studied to improve the performance of DD for high-performance short-reach optical interconnects. In this paper, we report the recent progress on the advanced DD modulation formats that provide superior electrical spectral efficiency (SE) and transmission reach beyond that of simple direct modulation (DM) based direct detection (DM/DD). We first provide a review of the current advanced modulation formats for high-performance short-reach optical interconnects. Among these formats, Stokes vector direct detection (SV-DD) achieves the highest electrical spectrum efficiency, presenting itself as a promising candidate for future short-reach networks. We then expound some novel algorithms to achieve high-performance SV-DD systems under severe impairments of either polarization mode dispersion (PMD) or polarization dependent loss (PDL). PMID:25836183

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

    NASA Technical Reports Server (NTRS)

    Reinhart, Richard C.

    1993-01-01

    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.

  17. Performance analysis for near-field atmospheric optical communications

    E-print Network

    Erkmen, Baris Ibrahim, 1980-

    2003-01-01

    Establishing, high data rate communication links over short distances via fiber-optic cables may prove costly and time consuming, particularly in urban areas. Through-the-air optical communication systems are a reliable ...

  18. Laser communication requirements imposed by high resolution sensor systems

    Microsoft Academic Search

    J. P. Gamon; M. L. Belcher; R. L. Muse

    1988-01-01

    Long-range, wideband data-rate, satellite communication is necessary to support the command-and-control architectures evolving for a number of strategic, tactical, and remote sensing systems. Laser communications system is particularly attractive for intersatellite crosslink applications where the communications system must be incorporated into spaceborne platform designs without major operational impact. System trade-offs and technology issues involved in devising a laser communications crosslink

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

    SciTech Connect

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

    2012-09-15

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

  20. System Design Considerations for High data Rate Communications Over Multi-wire Overhead Power-

    E-print Network

    Kavehrad, Mohsen

    System Design Considerations for High data Rate Communications Over Multi-wire Overhead Power communication system by means of coding and adaptive resource allocation. In section II, a brief review, PA 16802 Abstract Broadband power-line communications over multi-wire overheard lines using

  1. A Universal Micro-Sensor Interface Chip with Network Communication Bus and Highly Programmable Sensor Readout

    E-print Network

    Mason, Andrew

    A Universal Micro-Sensor Interface Chip with Network Communication Bus and Highly Programmable and actuators. The interface chip contains all necessary reference, readout, control, and communication], a Serial Peripheral Interface (SPI) with a 4b chip select for communication with optional external

  2. High level communication interface design for integrated MEMS and microinstrument bus

    Microsoft Academic Search

    M. Rodriguez; E. Magdaleno; C. Ferrer; B. Lorente; A. Ayala

    2005-01-01

    A microelectromechanical system (MEMS) merges integrated sensors, microactuators, and low-power electronics. These systems normally have a local sensor communication bus managed by a master node. The purpose of this work is to implement a communication interface that permit connect the integrated MEMS local bus (through the master node) with on a high level microinstrument communication bus. The basic philosophy of

  3. Short communication: Interactions of milk, fat, and protein yield genotypes with herd feeding characteristics.

    PubMed

    Dekleva, M W; Dechow, C D; Daubert, J M; Liu, W S; Varga, G A; Bauck, S; Woodward, B W

    2012-03-01

    Data from 879 Holstein cows from 11 tie-stall herds in Pennsylvania were analyzed to determine the effects of nutritional management practices on the level of genetic expression for milk, fat, and protein yields. Environments were defined according to the amount of dry matter refusals at the end of 24h for the average cow (DMR), diet crude protein percentage (CP), and diet NE(L) concentration. Sire predicted transmitting ability (PTA) was available for all cows, whereas 775 cows were genotyped and received a molecular breeding value (MBV) for milk, fat, and protein yields. Milk, fat, and protein yields were regressed on sire PTA and cow MBV independently in addition to combined breeding values (CBV) of sire PTA and cow MBV. Four-trait animal models with fat-corrected milk yield in high and low environments plus either body weight or body condition score in high and low environments treated as separate traits were also evaluated. Regressions on sire PTA (0.31 for fat yield to 0.54 for milk yield) were significantly lower in the 5 herds that had the lowest average DMR than in the 6 herds with highest average DMR (0.82 for fat yield to 1.11 for protein yield). The regressions of milk and protein yield on CBV were also significantly lower in the 5 herds with low NE(L) concentration in the ration than in herds that had high NE(L) concentration. Genetic correlations from animal models showed that large cows were more affected by low DMR, CP, and NE(L) concentration than smaller cows. Efforts to minimize feed wastage must ensure that cows receive adequate nutrient intake to avoid suppression of genetic potential for yield, particularly for larger cows. PMID:22365236

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

    PubMed Central

    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

    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

  5. Short communication-Evaluation of antianxiety and antidepressant properties of Carthamus tinctorius L. (Safflower) petal extract.

    PubMed

    Qazi, Nasreen; Khan, Rafeeq Alam; Rizwani, Ghazala H

    2015-05-01

    Nowadays anxiety and depression are most commonly encountered diseases. They are not only difficult to diagnose but even difficult to treat since both are sometimes seen together or one predisposes the other. Apart from this side effect profile of these drugs is also high; hence there is immense scope for the herbal drugs to treat these disorders. Present study was therefore performed to evaluate the antianxiety and antidepressant effect of Carthamus tinctorius petal extract. 28 white albino rats bred in the animal house of Department of Pharmacology, University of Karachi weighing 180-220gm were randomly divided into four groups (n=7/group) to assess behavioral effects. The anxiolytic and antidepressant effects of Carthamus tinctorius petal extract were evaluated using elevated plus maize and forced swim test respectively at100 and 200mg/kg. These effects were compared with standard drugs Diazepam (anxiolytic) 2mg/kg and Nortriptyline (antidepressant) 12.5mg/kg. Results show that CT produced highly significant anxiolytic and anti-depressant effects at both doses as compared to control, similar to standard anxiolytic and antidepressant drugs diazepam and nortriptyline. It increased the latency of first entry to closed arms and the time spent in open arms very significantly at both doses while entries to open arm were increased significantly at 100mg/kg and very significantly at 200mg/kg in EPM test and increased the immobility time very significantly in FST. Hence it can be concluded that CT may be used as an alternative therapeutic agent while treating patients with anxiety and depressive disorders. PMID:26004733

  6. Power-aware, dependable, and high-performance communication link using PCI Express: PEARL

    Microsoft Academic Search

    Toshihiro Hanawa; Taisuke Boku; S. Miura; M. Sato; K. Arimoto

    2010-01-01

    We have proposed a power-aware, dependable, and high-performance communication link using PCI Express as a direct communication device, referred to as PEARL for application in a wide range of parallel and distributed systems from high-end embedded systems to small-scale high-performance clusters. The PEACH chip, as a communicator chip for realizing PEARL, concentrates four ports of PCI Express Gen 2 with

  7. PEARL: Power-Aware, Dependable, and High-Performance Communication Link Using PCI Express

    Microsoft Academic Search

    Toshihiro Hanawa; Taisuke Boku; S. Miura; M. Sato; K. Arimoto

    2010-01-01

    We have proposed a power-aware, high-performance, dependable communication link using PCI Express as a direct communication device, referred to as PEARL, for application in a wide range of parallel processing systems from high-end embedded system to small-scale high-performance clusters. In the present study, we describe the structure and function of a communicator chip, referred to as the PEACH chip, for

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

    PubMed

    Bchel, S; Sundrum, A

    2014-05-01

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

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

    SciTech Connect

    Chang, C.; Tang, C. X. [Department of Engineering Physics, Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Tsinghua University, Beijing 100084 (China); Shao, H.; Chen, C. H.; Huang, W. H. [Northwest Institute of Nuclear Technology, Xi'an, Shannxi 710024 (China)

    2010-05-15

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

  10. High performance computing and communications: Investment in American competitiveness

    NASA Astrophysics Data System (ADS)

    1991-03-01

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

  11. The design of space optical communications terminal with high efficient

    NASA Astrophysics Data System (ADS)

    Deng, Xiaoguo; Li, Gang; Jiang, Bo; Yang, Xiaoxu; Yan, Peipei

    2015-02-01

    In order to improve high-speed laser space optical communications terminal receive energy and emission energy, meet the demand of mini-type and light-type for space-based bear platform, based on multiple-reflect coaxial optical receiving antenna structure, while considering the installation difficulty, a high-efficient optical system had been designed, which aperture is off-axial, both signal-receiving sub-optical system and emission sub-optical system share a same primary optical path. By the separating light lens behind the primary optical path, the received light with little energy will be filtered and shaped and then transmitted to each detector, at the same time, by the coupling element, the high-power laser will be coupling into optical antenna, and then emitted to outside. Applied the power-detected optical system evaluate principle, the optimized off-axial optical system's efficiency had been compared with the coaxial optical system. While, analyzed the Gauss beam energy distribution by numerical theory, discussed that whether off-axis optical system can be an emission terminal, verify the feasibility of the theory of the design of the system.

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

    PubMed

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

    2015-02-01

    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

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

    PubMed Central

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

    2014-01-01

    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

  14. Short communication: Comparison of estrus characteristics in Holstein heifers by 2 activity monitoring systems.

    PubMed

    Silper, B F; Madureira, A M L; Kaur, M; Burnett, T A; Cerri, R L A

    2015-05-01

    Two activity monitoring systems-Heatime (SCR Engineers Ltd., Netanya, Israel) and IceTag (IceRobotics Ltd., Edinburgh, UK)-were compared on their ability to detect and quantify estrus expression. Holstein heifers (n=57) were fitted with Heatime (HT) and IceTag (IT) sensors from 12 mo of age until confirmation of pregnancy. Upon detection of high activity by HT, ovaries were scanned by ultrasound, a blood sample was collected for analysis of plasma estradiol, and signs of estrus (clear vaginal mucus, uterine muscle tone, visual mounting activity, standing to be mounted, or rump showing signs of repeated acceptance of mounts) were recorded. Because only estrus episodes detected by HT (n=111) were further evaluated, only the positive predictive value was measured. Heifers were housed in groups of 24 in a freestall pen. Data were analyzed using Proc CORR and GLM of SAS (SAS Institute Inc., Cary, NC). The positive predictive value was 84.7% (94/111) for HT and 98.7% (74/75) for IT. Estrus duration was recorded by HT as 14.34.1h [mean standard deviation (SD)] and by IT as 15.04.0h; duration measurements were correlated (r=0.60). The mean duration difference was 0.743.52h. Recordings of onset and end of estrus by IT were 3.54.3h and 2.94.9h earlier than those by HT. The overlap in duration was 9h. Measurements of estrus intensity were correlated (r=0.63). Peak activity was 77.319.5 index value (approximately 7.7 SD from basal activity) on HT. The relative increase in activity measured by IT was 360170% baseline value. Measurements of intensity and duration from HT were correlated (r=0.64) but those from IT were not (r=0.13). Plasma estradiol concentration (11.24.6pg/mL) was not correlated with preovulatory follicle diameter or with duration or intensity of estrus. Diameter of preovulatory follicle (15.72.6mm) had no correlation with duration of estrus and was only weakly correlated with intensity measured by either system. Baseline steps/hour was negatively correlated with intensity from both sensors (r=-0.37 and -0.70 for HT and IT). Estrus episodes accompanied by 2 or 3 of the monitored signs of estrus had greater intensity and duration on HT but not on IT. Preovulatory follicle diameter and plasma estradiol concentration did not influence occurrence of estrus signs. Results indicate that both systems identified estrus precisely, with correlated characterization and similar timing. In contrast, relationships with plasma estradiol concentration and signs of estrus require further investigation. PMID:25747827

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

    ERIC Educational Resources Information Center

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

    2011-01-01

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

  16. The PS/PDI: a high accuracy development tool for diffraction limited short-wavelength optics

    E-print Network

    The PS/PDI: a high accuracy development tool for diffraction limited short-wavelength optics ultraviolet (EUV) phase-shifting point diffraction interferometer (PS/PDI) was developed and implemented projection lithography optics. The PS/PDI has been in continuous use and under ongoing development since 1996

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

    Microsoft Academic Search

    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

    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.

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

    E-print Network

    Mohseni, Hooman

    in short wave infrared (SWIR) spectrum, particularly focusing at 1.55 m wavelength. Spanning a wide range of applications from slow imaging technologies to very high speed fiber telecommunications, SWIR contains both of detectors have been created. Common technologies for SWIR detection are InGaAs/InP based detectors (P

  19. BRIEF REPORT Does visual short-term memory have a high-capacity stage?

    E-print Network

    Hollingworth, Andrew

    BRIEF REPORT Does visual short-term memory have a high-capacity stage? Michi Matsukura & Andrew away from precise sensory features of the original stimulus (Irwin, 1991; Phillips, 1974), can retain interference than is iconic memory (Pashler, 1988; Phillips, 1974). These long-standing assumptions were

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

    E-print Network

    Boyer, Edmond

    Short pulse and high repetition rate diode-pumped Yb:CaF2 regenerative amplifier S. Ricaud1,4 , F.ricaud@institutoptique.fr Abstract: We present a diode-pumped regenerative amplifier based on an Yb:CaF2 crystal optimized to produce obtained. Nevertheless, for energies above the mJ range, regenerative amplifiers are required

  1. PM: An Operating System Coordinated High Performance Communication Library

    Microsoft Academic Search

    Hiroshi Tezuka; Atsushi Hori; Yutaka Ishikawa; Mitsuhisa Sato

    1997-01-01

    . 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

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

    Microsoft Academic Search

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

    1997-01-01

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

  3. High resolution X-ray tomography of short fatigue crack nucleation in austempered ductile cast iron

    Microsoft Academic Search

    T. J. Marrow; J.-Y. Buffiere; P. J. Withers; G. Johnson; D. Engelberg

    2004-01-01

    High-resolution X-ray tomography with synchrotron radiation has been used to obtain observations of the early stages of fatigue crack nucleation in an austempered ductile cast iron. The stable short cracks nucleated in the stress concentration of a pore and arrested due to microstructure barriers. These observations demonstrate the potential for future applications of high-resolution tomography to fracture mechanisms research.

  4. A high-speed railway mobile communication system based on LTE

    Microsoft Academic Search

    Gao Tingting; Sun Bin

    2010-01-01

    Along with the developments of the high-speed railway, higher and higher technical requirements for the high-speed railway mobile communication system are raised. Since the Global System for Mobile Communications Railways (GSM-R) implemented today is based on GSM, the new technology in GSM evolution can be used in the highspeed railway mobile communication system to adapt to the new requirements. This

  5. Short Distance Wireless Communications

    Microsoft Academic Search

    Robert Puers; Jef Thon

    \\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

  6. Studies of plastic optical fibers for applications in high-speed communication networks

    Microsoft Academic Search

    Gang Jiang

    1998-01-01

    In this thesis, we report the results of our experimental and theoretical studies of the optical properties of large core step index (SI) plastic optical fibers (POF) and graded index (GI) POFs. A set of criteria and analyses of physical parameters are developed in context to the major issues of POF applications in short-distance communication systems. Analyses are presented to

  7. Short communication Electrochemical properties of NaNi1/3Co1/3Fe1/3O2 as a cathode material

    E-print Network

    Ceder, Gerbrand

    Short communication Electrochemical properties of NaNi1/3Co1/3Fe1/3O2 as a cathode material for Na November 2013 Available online 21 November 2013 Keywords: Na batteries NaNi1/3Fe1/3Co1/3O2 Cathode Principles calculations Oxidation state NaNi1/3Fe1/3Co1/3O2 is synthesized by solid-state methods

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

    NASA Astrophysics Data System (ADS)

    Kuchta, Daniel M.

    2014-02-01

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

  9. Short-wavelength electroluminescence from single-walled carbon nanotubes with high bias voltage.

    PubMed

    Hibino, Norihito; Suzuki, Satoru; Wakahara, Hiroyuki; Kobayashi, Yoshihiro; Sato, Tetsuya; Maki, Hideyuki

    2011-02-22

    Short-wavelength electroluminescence (EL) emission is observed from unipolar and ambipolar carbon nanotube field-effect transistors (CNFETs) under high bias voltage. EL measurements were carried out with an unsuspended single-walled carbon nanotube (SWNT) in high vacuum to prevent the oxidation damage induced by current heating. Short-wavelength emission under high bias voltage is obtained because of the Schottky barrier reduction and the electric field increase in a SWNT. The simultaneous measurements of transport and EL spectra revealed the excitation mechanism of impact excitation or electron and hole injection dependent on the conduction type of unipolar or ambipolar characteristics. In addition to the EL emission, blackbody radiation was also observed in a p-type CNFET. Taking into account the device temperature estimated from blackbody radiation, the contribution of impact excitation and thermal effect to the exciton production rate was evaluated. PMID:21204568

  10. Identification of mammalian species using the short and highly variable regions of mitochondrial DNA.

    PubMed

    Xie, Jianhui; Zhu, Wei; Zhou, Yueqin; Liu, Zhiping; Chen, Yang; Zhao, Ziqin

    2015-08-01

    The mitochondrial DNA (mtDNA) typing is useful for the species determination of degraded samples and the nucleotide diversity of target fragments across species is crucial for the discrimination. In this study, the short and highly polymorphic regions flanked by two conserved termini were sought by the sequence alignment of mtDNA across species and two target regions located at 12S rRNA gene were characterized. Two universal primer sets were developed that appear to be effective for a wide variety of mammalian species, even for domestic birds. The two target regions could be efficiently amplified using their universal primer sets on degraded samples and provide sufficient information for species determination. Therefore, the two short and highly variable target regions might provide a high discriminative capacity and should be suitable for the species determination of degraded samples. PMID:24438314

  11. Efficient and Reliable High Level Communication in Randomly Deployed Wireless Sensor Networks

    E-print Network

    Diaz, Josep

    Efficient and Reliable High Level Communication in Randomly Deployed Wireless Sensor Networks #3 communication system in a randomly deployed network of sensors equipped with directional antennas. Such high widespread choice of communica tion for sensor networks. Both omnidirectional antennas or direc tional

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

    NASA Astrophysics Data System (ADS)

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

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

  13. Design of high sensitivity detector for underwater communication system

    NASA Astrophysics Data System (ADS)

    Cheong, J. S.; Ong, J. S. L.; Ng, J. S.; Krysa, A. B.; Bastiman, F.; David, J. P. R.

    2013-11-01

    Al0.52In0.48P is the largest bandgap material in III-V non-nitride semiconductors that is lattice matched to a readily available substrate (GaAs). Having a bandgap narrower than that of GaN enables it to detect wavelengths around 480 nm. Such wavelengths have the best transmittance underwater and may be used as a carrier in underwater communication systems. We present an Al0.52In0.48P homo-junction Separate-Absorption-Multiplication-Avalanche-Photodiode (SAMAPD) as a high sensitivity detector for such an application. By increasing the neutral and space-charge region thicknesses, the peak response wavelength can be tuned to longer wavelengths with a narrower full-width-half-maximum (FWHM). The quantum efficiency of the detector reduces with FWHM and this is compensated by having an avalanche gain. At room temperature, the SAM-APD has a dark current of <20 pA for a 210 ?m radius device up to 99.9% of breakdown voltage. The structure gives a narrow spectral FWHM of 22 nm with centre wavelength of 482 nm. An external quantum efficiency of 33% and 6410% at 482 nm is obtained at bias voltage of -19 V and -92.6 V respectively.

  14. Modelling high data rate communication network access protocol

    NASA Technical Reports Server (NTRS)

    Khanna, S.; Foudriat, E. C.; Paterra, Frank; Maly, Kurt J.; Overstreet, C. Michael

    1990-01-01

    Modeling of high data rate communication systems is different from the low data rate systems. Three simulations were built during the development phase of Carrier Sensed Multiple Access/Ring Network (CSMA/RN) modeling. The first was a model using SIMCRIPT based upon the determination and processing of each event at each node. The second simulation was developed in C based upon isolating the distinct object that can be identified as the ring, the message, the node, and the set of critical events. The third model further identified the basic network functionality by creating a single object, the node which includes the set of critical events which occur at the node. The ring structure is implicit in the node structure. This model was also built in C. Each model is discussed and their features compared. It should be stated that the language used was mainly selected by the model developer because of his past familiarity. Further the models were not built with the intent to compare either structure or language but because the complexity of the problem and initial results contained obvious errors, so alternative models were built to isolate, determine, and correct programming and modeling errors. The CSMA/RN protocol is discussed in sufficient detail to understand modeling complexities. Each model is described along with its features and problems. The models are compared and concluding observations and remarks are presented.

  15. Chemical Communication

    NSDL National Science Digital Library

    0000-00-00

    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.

  16. Analog integrated circuit design techniques for high-speed signal processing in communications systems

    E-print Network

    Hernandez Garduno, David

    2009-05-15

    This work presents design techniques for the implementation of high-speed analog integrated circuits for wireless and wireline communications systems. Limitations commonly found in high-speed switched-capacitor (SC) circuits used for intermediate...

  17. Design of high performance frequency synthesizers in communication systems

    E-print Network

    Moon, Sung Tae

    2005-08-29

    . This dissertation presents a full cycle of the synthesizer design procedure starting from the interpretation of standards to the testing and measurement results. A new methodology of interpreting communication standards into low level circuit specifications...

  18. Design of high performance frequency synthesizers in communication systems

    E-print Network

    Moon, Sung Tae

    2005-08-29

    Frequency synthesizer is a key building block of fully-integrated wireless communication systems. Design of a frequency synthesizer requires the understanding of not only the circuit-level but also of the transceiver system-level considerations...

  19. Multiplexed communication over a high-speed quantum channel

    SciTech Connect

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

    2010-03-15

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

  20. High-performance signal acquisition algorithms for wireless communications receivers

    E-print Network

    Shi, Kai

    2006-10-30

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

  1. Photoluminescence spectra of GaP\\/AlP short-period superlattices under high magnetic fields

    Microsoft Academic Search

    Kazuhito Uchida; Noboru Miura; Jun Kitamura; Hiroshi Kukimoto

    1996-01-01

    Photoluminescence spectra in a series of GaP\\/AlP short-period superlattices were measured under high magnetic fields up to 40 T in the Faraday and the Voigt configurations. A large dependence of the photoluminescence intensity upon the magnetic-field direction relative to the superlattice layers was found. Namely, in the Faraday configuration, the peak intensity decreased dramatically with increasing applied magnetic field perpendicular

  2. High temperature short time air puffed ready-to-eat (RTE) potato snacks: Process parameter optimization

    Microsoft Academic Search

    A. Nath; P. K. Chattopadhyay; G. C. Majumdar

    2007-01-01

    Ready-to-eat (RTE) potato snacks were developed with high temperature short time (HTST) air puffing process based on centre composite RSM design. The effects of process parameters viz. puffing temperature (175275C), puffing time (1575s), initial moisture content (3040%) and air velocity (2.44.8m\\/s) on quality attributes such as expansion ratio, hardness, ascorbic acid loss and overall acceptability of the products were investigated.

  3. High short-term mortality following lung biopsy for usual interstitial pneumonia

    Microsoft Academic Search

    J. P. Utz; J. H. Ryu; W. W. Douglas; T. E. Hartman; H. D. Tazelaar; J. L. Myers; M. S. Allen; D. R. Schroeder

    2001-01-01

    High short-term mortality following lung biopsy for usual interstitial pneumonia. J.P. Utz, J.H. Ryu, W.W. Douglas, T.E. Hartman, H.D. Tazelaar, J.L. Myers, M.S. Allen, D.R. Schroeder. #ERS Journals Ltd 2001. ABSTRACT: Usual interstitial pneumonia (UIP) is a specific histological pattern of interstitial pneumonia most often associated with the clinical syndrome of idiopathic pulmonary fibrosis (IPF). There is controversy regarding the

  4. Short highly intense exercise causes changes in salivary concentrations of hydrocortisone and secretory IgA.

    PubMed

    Khaustova, S A; Shkurnikov, M U; Tonevitsky, A G

    2010-10-01

    The dynamics of salivary hydrocortisone during exercise depends on the professional status of the athlete. Hydrocortisone concentrations increase and those of secretory IgA decrease significantly during short-term highly intense exercise. Presumably, basal serum hydrocortisone level is the key factor in restoration of the secretory IgA concentration after exercise by inhibition of lymphocyte, macrophage, and monocyte functions through an increase in glucocorticoid level under the effect of physiological stressors. PMID:21165406

  5. PIC Simulations of Short-Pulse High-Intensity Laser-Plasma Interactions.

    NASA Astrophysics Data System (ADS)

    Lasinski, B. F.; Still, C. H.; Langdon, A. B.; Town, R. P. J.; Tabak, M.; Kruer, W. L.; Wilks, S. C.

    2003-10-01

    We use our MPP PIC code, Z3, to model short-pulse high-intensity laser plasma interactions in 2D and 3D. The 3D modeling of the laser pulse through the underdense plasma produced by a prepulse is discussed and its impact on the laser plasma interaction in the overdense region is assessed. We also describe the production of charged particles for parameters associated with current and planned experiments.

  6. Wideband Coupled-Line Microstrip Filters With High-Impedance Short-Circuited Stubs

    Microsoft Academic Search

    Hee-Ran Ahn; Sangwook Nam

    2011-01-01

    There have been difficulties in realizing wideband coupled-line filters with microstrip technology due to tight cou- plings demanded at input and output ports. To solve the problem, a realization method using high-impedance short-circuited stubs is proposed. To verify it, a coupled-line microstrip filter with more than 65% bandwidth is fabricated at 3 GHz and measured. Measured results are in good

  7. LOTTERYBUS: a new high-performance communication architecture for system-on-chip designs

    Microsoft Academic Search

    Kanishka Lahiri; Anand Raghunathan; Ganesh Lakshminarayana

    2001-01-01

    This paper presents Lotterybus, a novel high-performance communication architecture for system-on-chip (SoC) designs. The Lotterybus architecture was designed to address the following limitations of current communication architectures: (i) lack of control over the allocation of communication bandwidth to different system components or data flows (e.g., in static priority based shared buses), leading to starvation of lower priority components in some

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

    NASA Astrophysics Data System (ADS)

    Benet, James

    1994-03-01

    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.

  9. Impact of a Program to Facilitate Mother-Infant Communication in High-Risk Families of High-Risk Infants.

    ERIC Educational Resources Information Center

    Haney, Michele; Klein, M. Diane

    1993-01-01

    Mothers in the Mother-Infant Communication Project (MICP), designed to facilitate caregivers' uses of communicative interaction strategies with their high-risk infants, scored better than comparison mothers on caregiving environment quality. Children of MICP mothers who received a group experience in addition to home visits performed better on

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

    Microsoft Academic Search

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

    2010-01-01

    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

  11. High bandwidth specialty optical fibers for data communications

    NASA Astrophysics Data System (ADS)

    Li, Jie; Sun, Xiaoguang

    2008-11-01

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

  12. Short and Long-Term Impacts of Biotechnology Education on Professionals Who Communicate Science to the Public

    ERIC Educational Resources Information Center

    Fritz, Susan M.; Ward, Sarah M.; Byrne, Pat F.; Namuth, Deana M.; Egger, Valerie A.

    2004-01-01

    Consumer acceptance or rejection of biotechnology is often shaped by information prepared by communicators with varying levels of scientific knowledge, awareness, and acceptance. This study compared the prior, post-workshop, and sustained (1 year) biotechnology awareness, acceptance, and attitudes of professionals who communicate biotechnology to

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

    E-print Network

    Paris-Sud XI, Universit de

    Java Objects Communication on a High Performance Network Luc Courtrai, Yves Maheo, Fr. Recent works show the interest in Java for cluster programming. One of the main issues is to handle an alternative to the standard serialization process through the proposal of a Java object communication library

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

    Microsoft Academic Search

    Tanya L. Ramer

    2008-01-01

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

  15. Tools Supporting the Communication of Critical Application Domain Knowledge in High-Consequence Systems Development

    Microsoft Academic Search

    Kimberly S. Hanks; John C. Knight; Elisabeth A. Strunk; Sean R. Travis

    A disproportionate number of defects in the software of high- consequence systems can be traced to invalid requirements. Predictably achieving requirements validity has proven extremely difficult because of the informal nature of this property, and poor communication of application domain knowledge has been implicated as a main barrier to increasing this validity. Effective communication of application domain knowledge between domain

  16. A High Capacity Hybrid Fiberoptic/Wireless Communication System: An Overview W. D. Jemison1

    E-print Network

    Herczfeld, Peter

    A High Capacity Hybrid Fiberoptic/Wireless Communication System: An Overview by W. D. Jemison1 , P amplifiers to wirelessly distribute the information signals to mobile users located within the basestation reconfiguration. Alternatively, while wireless communication systems using traditional RF or microwave frequencies

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

    ERIC Educational Resources Information Center

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

    2008-01-01

    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

  18. High Throughput Intra-Node MPI Communication with Open-MX

    E-print Network

    Paris-Sud XI, Universit de

    High Throughput Intra-Node MPI Communication with Open-MX Brice Goglin INRIA Bordeaux La computing requires an efficient intra-node MPI communication subsystem. Most existing MPI implementations backend of many MPI layers. We describe this implementation and its offloaded copy backend using I

  19. Overview of the Preliminary Design of the Optical Communication Demonstration and High-Rater Link Facility

    NASA Technical Reports Server (NTRS)

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

    1999-01-01

    This 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.

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

    PubMed Central

    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

    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

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

    NASA Technical Reports Server (NTRS)

    Murawski, Robert W.; Tchorowski, Nicole; Golden, Bert

    2014-01-01

    As the data rate requirements for space communications increases, significant stress is placed not only on the wireless satellite communication links, but also on the ground networks which forward data from end-users to remote ground stations. These wide area network (WAN) connections add delay and jitter to the end-to-end satellite communication link, effects which can have significant impacts on the wireless communication link. It is imperative that any ground communication protocol can react to these effects such that the ground 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 test the CCSDS SLE protocol implementations proposed for use on future NASA communication networks. Our results show that in the presence of realistic levels of network delay, high-throughput SLE communication links can experience significant 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 as well to the SLE implementation developers which, based on our reports, developed a new release for SLE which we show fixes the SLE blocking issue and greatly improves the protocol throughput. In this paper, we also discuss future developments for our end-to-end emulation lab and how these improvements can be used to develop and test future space communication technologies.

  2. Analysis of the Interaction of Short-Pulse High-Fluence Radiation with Targets

    SciTech Connect

    Lawrence, R.Jeffery

    1999-07-23

    We generally use large-scale hydrocodes to study the dynamic response of targets to influence pulsed radiation loads. However, for many applications where the desired solution does not require a detailed specification of pressure- or velocity-time histories, there are simple analytic approaches that can yield surprisingly accurate results. Examples include determining either the final velocity of a radiation-driven flying plate or the impulse delivered to a structural element. These methods are all based on relatively straightforward use of conservation of mass and momentum, but they typically need one scaling-law parameter. In this context, short pulse means short compared to the characteristic time of the desired response, which allows for the phenomena to be essentially uncoupled. High fluence means that the input energy is great enough to yield vaporization or blowoff of one or more portions of the configuration. We discuss some of these methods, give examples, and suggest limitations and criteria for their use.

  3. Communications

    ERIC Educational Resources Information Center

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

    2013-01-01

    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

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

    ERIC Educational Resources Information Center

    Duval County School Board, Jacksonville, FL.

    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

  5. 60 GHz High Data Rate Wireless Communication System

    E-print Network

    Paris-Sud XI, Université de

    propagation and penetration losses, 60 GHz WLANs (Wireless Local Area Networks) are primarily intended for use-waves for the carrier frequency. Many system proposals under the IEEE 802.15.3c Task Group for wireless local personal communication system is composed of radio frequency (RF) blocks, intermediate frequency (IF) blocks and baseband

  6. Toward High-Performance Communications Interfaces for Science Problem Solving

    ERIC Educational Resources Information Center

    Oviatt, Sharon L.; Cohen, Adrienne O.

    2010-01-01

    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

  7. Applications of multichip modules for high speed communications interfaces

    Microsoft Academic Search

    A. Kozak

    1992-01-01

    The analysis of next generation broadband communication equipment shows that advanced packaging technology is required to meet system performance, thermal and density requirements. A description of a broadband crossconnect switching system is provided, and the use of multichip module technology to satisfy the system packaging requirements is reviewed. A module solution to one of the key elements of the system,

  8. Communications Through Media: A Career Program for High School Students.

    ERIC Educational Resources Information Center

    Finkelstein, Norman H.

    The Brookline, Massachusetts, Public School System's career education program includes a Communications Through Media curriculum. The four-year sequence is designed primarily for students oriented to media careers, but is also open to others with media interests. The program's core course is taught in the 9th grade and seeks to acquaint students

  9. High\\/Low Context Communication: The Malaysian Malay Style

    Microsoft Academic Search

    Lailawati Mohd Salleh

    2005-01-01

    Globalization and workforce mobilization have prompted many scholars and researchers to conduct intercultural studies. In studies on eastern intercultural communication, research focus has been on the Japanese and Chinese cultures. However, there are other eastern cultures which are less known to the intercultural scholars. Therefore, the author of this paper hopes to introduce a group of individuals who seldom appear

  10. Efficient Multicarrier Communication for Highly Spread Underwater Acoustic Channels

    Microsoft Academic Search

    Sung-jun Hwang; Philip Schniter

    2008-01-01

    In this paper we propose a novel method for communication over underwater acoustic channels that exhibit simultaneously large delay spread and Doppler spread, such as those found in the surf zone. In particular, we propose a coded pulse-shaped multicarrier scheme that converts the doubly dispersive channel into an inter-carrier interference (ICI) channel with small ICI spread. The resulting ICI is

  11. Optimizing the Dynamic Distribution of Data-stream for High Speed Communications

    E-print Network

    Zhao, Z.W.

    The performances of high-speed network communications frequently rest with the distribution of data-stream. In this paper, a dynamic data-stream balancing architecture based on link information is introduced and discussed ...

  12. The Application of Short Forms of the Wechsler Intelligence Scales in Adults and Children with High Functioning Autism

    ERIC Educational Resources Information Center

    Minshew, Nancy J.; Turner, Catherine A.; Goldstein, Gerald

    2005-01-01

    We evaluated the predictive accuracy of short forms of the Wechsler intelligence scales for individuals with high functioning autism. Several short forms were derived from participants who had received the full procedure. Stepwise multiple regression analyses were performed to determine the strength of association between the subtests included in

  13. High data rate atmospheric and space communications; Proceedings of the Meeting, Boston, MA, Sept. 8, 9, 1988

    Microsoft Academic Search

    Robert Hauptman

    1988-01-01

    Papers are presented on systems and applications, techniques and technology, and equipment and components in the field of high-data-rate atmospheric and space communications. Particular attention is given to laser communication requirements imposed by high-resolution sensor systems; tracking system design for small-aperture multiple access laser communications terminals; high-speed analog fiber-optic links for satellite communications; and fiber-optic delay lines for radar applications.

  14. Implementing Molecular Dynamics for Hybrid High Performance Computers - 1. Short Range Forces

    SciTech Connect

    Brown, W Michael [ORNL] [ORNL; Wang, Peng [NVIDIA, Santa Clara, CA] [NVIDIA, Santa Clara, CA; Plimpton, Steven J [ORNL] [ORNL; Tharrington, Arnold N [ORNL] [ORNL

    2011-01-01

    The use of accelerators such as general-purpose graphics processing units (GPGPUs) have become popular in scientific computing applications due to their low cost, impressive floating-point capabilities, high memory bandwidth, and low electrical power requirements. Hybrid high performance computers, machines with more than one type of floating-point processor, are now becoming more prevalent due to these advantages. In this work, we discuss several important issues in porting a large molecular dynamics code for use on parallel hybrid machines - 1) choosing a hybrid parallel decomposition that works on central processing units (CPUs) with distributed memory and accelerator cores with shared memory, 2) minimizing the amount of code that must be ported for efficient acceleration, 3) utilizing the available processing power from both many-core CPUs and accelerators, and 4) choosing a programming model for acceleration. We present our solution to each of these issues for short-range force calculation in the molecular dynamics package LAMMPS. We describe algorithms for efficient short range force calculation on hybrid high performance machines. We describe a new approach for dynamic load balancing of work between CPU and accelerator cores. We describe the Geryon library that allows a single code to compile with both CUDA and OpenCL for use on a variety of accelerators. Finally, we present results on a parallel test cluster containing 32 Fermi GPGPUs and 180 CPU cores.

  15. Short term operational experience from an inexpensive ultra-high concentration solar collector

    SciTech Connect

    Rincon, E.; Velasco, E.; Sanchez, M.; Vera, F. [UAEM, Toluca (Mexico). Facultad de Ingenieria

    1995-12-31

    In this paper the principal features of a cheap high-flux concentrator manufactured employing common-use materials but able to reach almost half of the thermodynamic limit by means of three optic stages, consisting of a paraboloidal dish, a conical mirror and a 3-D CPC are presented. The preliminary results from a first prototype produced a net concentration of approximately 30,600 suns, but with some improvements like the employment of a new mirror on the paraboloidal dish, a value of 37,630 was reached. This value falls short of the expected goal of 40,000 suns.

  16. Transport of hot electron currents in solid targets irradiated by high intensity short laser pulses

    NASA Astrophysics Data System (ADS)

    Antici, P.; Audebert, P.; Borghesi, M.; Cowan, T.; Gremillet, L.; Sentoku, Y.; Fuchs, J.

    2010-08-01

    We have analyzed the transport of hot electrons generated in the interaction between a short-pulse, ultra-high intensity laser beam (pulse duration ? 1018 W.cm 2.um2) and a solid or dense target through the use of proton emission imaging. We used targets of different material (Cu, Al, Au) with a regularly modulated rear target surface in order to compare the electron transport in different conditions. As result, we see that the electron transport depends on the target material and on the interaction conditions.

  17. A short synthesis of d-[1-(14) C]-serine of high enantiomeric purity.

    PubMed

    Song, Fengbin; Salter, Rhys; Weaner, Larry E

    2015-04-01

    Herein, we report a short, three-step synthesis of d-[1-(14) C]-serine (4) in high enantiomeric purity. Starting from [(14) C]-KCN and 2-(benzyloxy)acetaldehyde, Strecker reaction using (R)-1-phenylethylamine as the chiral auxiliary gave two diastereomeric aminonitriles 1 and 2 in the ratio of 4:3, which were conveniently separated and purified chromatographically. Following hydrolysis and subsequent hydrogenolysis, the purified major diastereomer 1, was smoothly converted to d-[1-(14) C]-serine (4) in an enantiomeric excess of >99%, thus circumventing time intensive chiral HPLC enantiomeric resolution. PMID:25728900

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

    NASA Astrophysics Data System (ADS)

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

    2014-01-01

    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.

  19. Steady State Analysis of Short-wavelength, High-gainFELs in a Large Storage Ring

    SciTech Connect

    Huang, Z.; Bane, K.; Cai, Y.; Chao, A.; Hettel, R.; /SLAC; Pellegrini, C.; /UCLA

    2007-10-15

    Storage ring FELs have operated successfully in the low-gain regime using optical cavities. Discussions of a high-gain FEL in a storage ring typically involve a special bypass to decouple the FEL interaction from the storage ring dynamics. In this paper, we investigate the coupled dynamics of a high-gain FEL in a large storage ring such as PEP and analyze the equilibrium solution. We show that an FEL in the EUV and soft x-ray regimes can be integrated into a very bright storage ring and potentially provides three orders of magnitude improvement in the average brightness at these radiation wavelengths. We also discuss possibilities of seeding with HHG sources to obtain ultra-short, high-peak power EUV and soft x-ray pulses.

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

    Microsoft Academic Search

    Goran M. Djuknic; John Freidenfelds; Y. Okunev

    1997-01-01

    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

  1. ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510

    SciTech Connect

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

    2011-05-20

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

  2. High Energy K(alpha) Radiography Using High-intensity, Short-pulse Lasers

    SciTech Connect

    Park, H; Izumi, N; Key, M H; King, J A; Koch, J A; Landen, O L; Patel, P K; Price, D F; Remington, B A; Robey, H F; Snavely, R A; Tabak, M; Town, R J; Wickersham, J E; Stoeckl, C; Storm, M; Theobald, W; Chambers, D M; Eagelton, R; Goldsack, T; Clarke, R J; Heathcote, R; Giraldez, E; Nikroo, A; Steinman, D A; Stephens, R B; Zhang, B B

    2005-11-16

    We have performed experiments using Callisto, the Vulcan 100 TW and the Vulcan Petawatt high intensity lasers to understand the characteristics of high energy, K{alpha} x-ray sources and to implement workable radiography solutions at 20-100 keV. Our measurements show that the K{alpha} size from a simple foil target is larger than 60 {micro}m, far larger than the experiment resolution requirement. The total K{alpha} yield is independent of target thicknesses verifying that refluxing plays a major role in photon generation. Smaller radiating volumes emit brighter K{alpha} radiation. 1-D radiography experiments using small-edge-on foils resolved 10 {micro}m features with high contrast. We tested a variety of small volume 2-D point sources such as cones, wires, and embedded wires, measuring photon yields and comparing our measurements with predictions from hybrid-PIC LSP simulations. In addition to high-energy, high-resolution backlighters, future experiments will also need imaging detectors and diagnostic tools that are workable in the 20-100 keV energy range. An initial look at some of these detector issues is also presented.

  3. Toward High-Performance Communications Interfaces for Science Problem Solving

    Microsoft Academic Search

    Sharon L. OviattAdrienne; Adrienne O. Cohen

    2010-01-01

    From a theoretical viewpoint, educational interfaces that facilitate communicative actions involving representations central\\u000a to a domain can maximize students effort associated with constructing new schemas. In addition, interfaces that minimize\\u000a working memory demands due to the interface per se, for example by mimicking existing non-digital work practice, can preserve\\u000a students attentional focus on their learning task. In this research, we

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

    E-print Network

    El-Gamal, Hesham

    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

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

    ERIC Educational Resources Information Center

    Daee, Safar; Wilding, J. M.

    1977-01-01

    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)

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

    NASA Technical Reports Server (NTRS)

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

    2006-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2008-09-01

    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.

  8. Laser space communications

    Microsoft Academic Search

    R. L. Phillips

    2000-01-01

    Summary form only given. Compared with conventional RF systems several significant advantages offered by laser communication (lasercom) systems in space applications that are simple consequences of the short wavelengths (high frequencies) associated with optical waves. Among these advantages are (i) smaller antenna (telescope), (ii) smaller size and weight of the components, (iii) power concentration in a very narrow beam, and

  9. Atomic short-range order and incipient long-range order in high-entropy alloys

    NASA Astrophysics Data System (ADS)

    Singh, Prashant; Smirnov, A. V.; Johnson, D. D.

    2015-06-01

    Within density-functional theory, we apply an electronic-structure-based thermodynamic theory to calculate short-ranged order (SRO) in homogeneously disordered substitutional N -component alloys, and its electronic origin. Using the geometric properties of an (N -1 ) simplex that describes the Gibbs (compositional) space, we derive the analytic transform of the SRO eigenvectors that provides a unique description of high-temperature SRO in N -component alloys and the incipient low-temperature long-range order. We apply the electronic-based thermodynamic theory and the new general analysis to ternaries (A 1 Cu-Ni-Zn and A 2 Nb-Al-Ti) for validation, and then to quinary Al-Co-Cr-Fe-Ni high-entropy alloys for predictive assessment.

  10. Ion Beams in Short-Pulse, High Intensity Laser Matter Interactions.

    NASA Astrophysics Data System (ADS)

    Lasinski, B. F.; Langdon, A. B.; Still, C. H.; Tabak, M.; Town, R. P. J.; Kruer, W. L.; Wilks, S. C.; Welch, D. R.

    2002-11-01

    Experiments on the interaction of short pulse high intensity lasers with thin foils have produced intense ion beams with surprisingly good emittance. We report on explicit PIC and hybrid particle-fluid simulations motivated by these experiments. In addition, we study the focusing of these beams and their possible collective effects. The LSP code footnote D. R. Welch, et al, Nucl. Inst. Meth. Phys. Res. A 242, 134 (2001). uses a direct implicit particle-in-cell algorithm in 2 or 3 dimensions to solve for the beam particles and the background particles are treated as a fluid. Implications for the fast ignitor concept footnote M. Tabak, et al, Phys. Plasmas 1, 1626 (1994). in which energetic fast particles transport energy to the high-density compressed fuel will be discussed.

  11. Production of neutrons up to 18 MeV in high-intensity, short-pulse laser matter interactions

    E-print Network

    Production of neutrons up to 18 MeV in high-intensity, short-pulse laser matter interactions D. P of neutrons up to 18 MeV in high-intensity, short-pulse laser matter interactions D. P. Higginson,1,2 J. M. Mc-energy neutrons using laser-accelerated ions is demonstrated experimentally using the Titan laser with 360 J

  12. Impact of a Program to Facilitate Mother-Infant Communication in High-Risk Families of High-Risk Infants

    Microsoft Academic Search

    Michele Haney; M. Diane Klein

    1993-01-01

    This article presents follow-up results of the Mother-Infant Communication Project (MICP), a program designed to facilitate caregivers' uses of communicative interaction strategies with their infants labeled high-risk. Three groups of mother-infant dyads were included in the study: a group receiving home visits only, a group receiving home visits plus a group experience, and a comparison group. Results showed MICP mothers

  13. A Short Review of Information and Communication Technologies and Basic Education in LDCs--What Is Useful, What Is Sustainable?

    ERIC Educational Resources Information Center

    Grace, Jeremy; Kenny, Charles

    2003-01-01

    Information and communication technologies such as radio and television have long been used in education. The advent of the technology of the Internet has created pressure for Internet access in primary and secondary schools across the world. This paper reviews some of the available evidence on the impact and cost of such technologies in

  14. An International Information Order? A Short Survey on the History and the Present State of a Challenging Concept. Communication Manual.

    ERIC Educational Resources Information Center

    Keune, Reinhard

    The issue of a world-wide information order is the focus of this paper, which outlines the history, status, perspective, and consequences of the NIICO (International Information and Communication Order) debate. The first section explains the concerns and events that led to a unanimously passed resolution by UNESCO calling for a new order for the

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

    NASA Technical Reports Server (NTRS)

    Murawski, Robert; Tchorowski, Nicole; Golden, Bert

    2014-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2014-12-01

    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.

  17. Flow characteristics of a pilot-scale high temperature, short time pasteurizer.

    PubMed

    Tomasula, P M; Kozempel, M F

    2004-09-01

    In this study, we present a method for determining the fastest moving particle (FMP) and residence time distribution (RTD) in a pilot-scale high temperature, short time (HTST) pasteurizer to ensure that laboratory or pilot-scale HTST apparatus meets the Pasteurized Milk Ordinance standards for pasteurization of milk and can be used for obtaining thermal inactivation data. The overall dimensions of the plate in the pasteurizer were 75 x 115 mm, with a thickness of 0.5 mm and effective diameter of 3.0 mm. The pasteurizer was equipped with nominal 21.5- and 52.2-s hold tubes, and flow capacity was variable from 0 to 20 L/h. Tracer studies were used to determine FMP times and RTD data to establish flow characteristics. Using brine milk as tracer, the FMP time for the short holding section was 18.6 s and for the long holding section was 36 s at 72 degrees C, compared with the nominal times of 21.5 and 52.2 s, respectively. The RTD study indicates that the short hold section was 45% back mixed and 55% plug flow for whole milk at 72 degrees C. The long hold section was 91% plug and 9% back mixed for whole milk at 72 degrees C. This study demonstrates that continuous laboratory and pilot-scale pasteurizers may be used to study inactivation of microorganisms only if the flow conditions in the holding tube are established for comparison with commercial HTST systems. PMID:15375033

  18. A Four-Stage Mesochronous Synchronizer with Back-Pressure and Buffering for Short and Long Range Communications

    E-print Network

    Ginosar, Ran

    A Four-Stage Mesochronous Synchronizer with Back-Pressure and Buffering for Short and Long Range., Technion, Haifa Israel A four-stage mesochronous synchronizer is described. It enables low latency and full and other asynchronous and mesochronous synchronizers. It is suitable for implementation using standard cell

  19. High-efficiency, high-power, fiber master oscillator power amplifier for deep-space communication operating at 1532 nm

    Microsoft Academic Search

    D. Sipes; A. L. Moretti; X. Luo; A. R. Sugg

    2010-01-01

    There is demand for improved deep-space satellite communications links with increased data rates to accommodate new sensor technologies and increased sensor payloads on spacecraft. It is imperative that new solutions be compact in size, light in weight, be high speed, and highly power efficient. Optical links offer potential improvements in power, size and weight due to a substantially narrower beam

  20. UWB High Data-Rate Wireless Communication System Base on MultiPulse Position Modulation

    Microsoft Academic Search

    Wang Ye-qiu; Lu Ying-hua; Xu Yong; He Peng-fei; Zhang Na

    2006-01-01

    In this paper, we propose a new modulation scheme called L-ary multi-pulse position modulation (L-ary MPPM) for ultra-wideband (UWB) high data-rate wireless communication systems. MPPM is an improved pulse position modulation(PPM) by employing multiple pulses and constant weight code to provide a better system performance with comparison with L-ary single-pulse position modulation (SPPM). The error probability and maximum reliable communication

  1. Remotely-interrogated high data rate free space laser communications link

    DOEpatents

    Ruggiero, Anthony J. (Livermore, CA)

    2007-05-29

    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.

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

    PubMed

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

    2013-06-01

    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

  3. Quantum data locking for high-rate private communication

    E-print Network

    Lupo, Cosmo

    We show that, if the accessible information is used as a security quantifier, quantum channels with a certain symmetry can convey private messages at a tremendously high rate, as high as less than one bit below the rate ...

  4. A high power high voltage short pulse width pulse generator using direct drive method in application of modulating-cathode tubes drive

    Microsoft Academic Search

    A. Hasanzadeh; S. M. R. Sadriyeh; A. Mohammadi; B. Maghsoudlou; H. Mokhtari; H. R. Alizadeh; S. M. Shams Mousavi

    2009-01-01

    The power supply of microwave tubes has high voltage and the possibility of produce high power pulse, which called in modulator. In this work, the results of design, construction and characterization of a direct drive pulse modulator for driving high power short pulse-width magnetron are reported. The sub-assemblies of modulator are; a primary high voltage supply, a switch bank with

  5. VERY HIGH-SPEED DRILL STRING COMMUNICATIONS NETWORK

    SciTech Connect

    David S. Pixton

    2002-11-01

    Testing of a high-speed digital data transmission system for drill pipe is described. Passive transmission of digital data through 1000 ft of telemetry drill pipe has been successfully achieved. Data rates of up to 2 Mbit/sec have been tested through the 1000 ft system with very low occurrence of data errors: required error correction effort is very low or nonexistent. Further design modifications have been made to improve manufacturability and high pressure robustness of the transmission line components. Failure mechanisms of previous designs at high pressure and high temperature are described. Present design limitations include high temperature application.

  6. Short pulse, high power microwave radiation source with a laser-induced sheet plasma mirror

    SciTech Connect

    Higashiguchi, Takeshi; Yugami, Noboru [Graduate School of Engineering and Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan)

    2009-05-01

    We have demonstrated the short pulse, high power microwave radiation source using an ultraviolet laser-induced sheet plasma mirror in a gas-filled x-band rectangular waveguide from the conventional microwave sources and components. A laser-induced sheet plasma with an overdense plasma acts as a plasma mirror. The long pulse propagating in the gas-filled waveguide was sliced by the sheet plasma mirror at two different points along the waveguide. We observed about twice the power of the pulse by adding the two sliced microwave pulses produced by this scheme. A maximum peak power of 200 kW with a pulse duration of 10 ns (full width at half maximum) from the long microwave pulse source with a pulse duration of 0.8 mus was observed.

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

    NASA Technical Reports Server (NTRS)

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

    2012-01-01

    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.

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

    SciTech Connect

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

    1989-04-01

    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.

  9. [Study of new XeCl laser with short duration time and preionzation at high pressure].

    PubMed

    Ren, Ren; Chen, Chang-Le; Xu, Jin; Zhu, Shi-Hua; Jing, Ke-Xin; Ren, Da-Nan; Wang, Yong-Cang; Yuan, Xiao; Song, Zhou-Mo

    2005-05-01

    New short duration time XeCI excimer laser has been generated at high pressure within a large volume in order to apply it to he interaction between laser and material, and material plasma study. The laser spectrum exhibits two laser lines at 307.98 and 308.19 nm, which is realized in the proportion of HCl:Xe: He = 0.1% :1% : 98.9% through UV preionization. Theoretic analysis indicated that the maximum intensity loop is B to X grade. Not only UV preionization, glow discharge and the calculation of dynamic equation, but also the laser spectrum and pulse duration time measurement were carried out. It is shown that the duration time decreases and pulse energy rises with the increase in the pressure and discharge voltage. The minimum duration time exceeds 13 ns, the pulse energy is 450 mJ, and the beam divergence angle is 3 mrad. PMID:16128052

  10. Short-course high-dose dexamethasone therapy for chronic idiopathic thrombocytopenic purpura in children.

    PubMed

    Yadav, Dinesh; Chandra, Jagdish; Sharma, Sunita; Singh, Varinder

    2010-12-01

    First-line therapies of acute and chronic idiopathic thrombocytopenic purpura (ITP) include intravenous immunoglobulin, IV anti-D and corticosteroids. A short-course high-dose dexamethasone (HDD-SC) therapy has recently been reported to be efficacious in acute ITP. The present study was conducted to assess the efficacy of HDD-SC in children with chronic ITP. Over a period of 10 months, 13 patients with chronic ITP were given HDD-SC (20 mg m(-2) IV daily for 4 days, four cycles repeated every 15 days). Of the 12 patients who could be evaluated, complete response was observed in 8 (66.6%) and moderate response in 2 (17%) patients, whereas 2 (17%) patients had no response. HDD-SC appears to be a safe and effective therapy in childhood ITP. PMID:20388659

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

    PubMed

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

    2012-07-30

    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

  12. Communication architecture tuners: a methodology for the design of high-performance communication architectures for systems-on-chips

    Microsoft Academic Search

    Kanishka Lahiri; Anand Raghunathan; Ganesh Lakshminarayana; Sujit Dey

    2000-01-01

    In this chapter, we present a general methodology for the design of custom system-on-chip communication architectures. Our technique is based on the addition of a layer of circuitry, called the Communication Architecture Tuner (CAT), around any existing communication architecture topology. The added layer enhances the ability of the system to adapt to changing communication needs of its constituent components. For

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

    PubMed

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

    2007-01-01

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

  14. COMMUNICATIONS High-power limitation of passive ring-resonator-coupled lasers

    E-print Network

    COMMUNICATIONS High-power limitation of passive ring-resonator-coupled lasers in the presence investigate the high-power limitation and stability of a passive ring-resonator-coupled laser RCL . A detailed. 2004 American Institute of Physics. DOI: 10.1063/1.1655675 Passive ring-resonator-coupled lasers RCL

  15. Home-High School Communication and Collaboration Are Plus Factors--The Question Is "How?".

    ERIC Educational Resources Information Center

    Holliday, Albert E.

    1986-01-01

    While recent reseach cites parent-school cooperation as beneficial, parent involvement in most high schools is minimal. To improve this situation, high school educators are invited to participate in a national study project emphasizing two-way communication, building relationships, joint planning and service activities, including parenting

  16. On xed input distributions for noncoherent communication over high SNR Rayleigh fading channels

    E-print Network

    Koetter, Ralf

    On #12;xed input distributions for noncoherent communication over high SNR Rayleigh fading channels Rong-Rong Chen #3; Dept. of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT information motivates the search for better choices of #12;xed input distributions for high-rate transmission

  17. High-Energy Neutron Source For Fusion Material Property Studies Using Short Pulse Lasers

    NASA Astrophysics Data System (ADS)

    Higginson, D. P.; McNaney, J. M.; Swift, D. C.; Bleuel, D.; MacKinnon, A. J.; Patel, P. K.; Petrov, G. M.; Davis, J.; Glebov, V. Yu; Stoeckl, C.; Cobble, J.; Frenje, J. A.; Kodama, R.; Nakamura, H.; Lancaster, K. L.; Jarrott, L. C.; Tynan, G.; Beg, F. N.

    2011-11-01

    High-energy (>10 MeV) neutron generation is of interest to applications including fusion energy, material damage studies and nondestructive material detection. A novel technique to create high-energy neutrons was demonstrated using short pulse (10 ps), high-energy (350-1000 J) lasers at the Titan and Omega EP laser systems. In this method, the laser accelerates deuterons from a CD foil, which produce neutrons as they pass through a LiF block via the reaction ^7Li(d,xn), Q=15 MeV. The spectrum is forward peaked in both energy and number. The presence of proton contaminants on the CD foil dramatically inhibits the acceleration of deuterons, which reduces the neutron generation. Activation diagnostics and CR39 detectors recorded single shot neutron fluences of up to 3x10^9 n sr-1. Neutron time-of-flight spectrometer detectors indicate the production of neutrons with energies up to 18 MeV in the forward direction. Methods to improve neutron yield and directionality will be presented.

  18. Solar Cell Short Circuit Current Errors and Uncertainties During High Altitude Calibrations

    NASA Technical Reports Server (NTRS)

    Snyder, David D.

    2012-01-01

    High altitude balloon based facilities can make solar cell calibration measurements above 99.5% of the atmosphere to use for adjusting laboratory solar simulators. While close to on-orbit illumination, the small attenuation to the spectra may result in under measurements of solar cell parameters. Variations of stratospheric weather, may produce flight-to-flight measurement variations. To support the NSCAP effort, this work quantifies some of the effects on solar cell short circuit current (Isc) measurements on triple junction sub-cells. This work looks at several types of high altitude methods, direct high altitude meas urements near 120 kft, and lower stratospheric Langley plots from aircraft. It also looks at Langley extrapolation from altitudes above most of the ozone, for potential small balloon payloads. A convolution of the sub-cell spectral response with the standard solar spectrum modified by several absorption processes is used to determine the relative change from AMO, lscllsc(AMO). Rayleigh scattering, molecular scatterin g from uniformly mixed gases, Ozone, and water vapor, are included in this analysis. A range of atmosph eric pressures are examined, from 0. 05 to 0.25 Atm to cover the range of atmospheric altitudes where solar cell calibrations a reperformed. Generally these errors and uncertainties are less than 0.2%

  19. Design of readout IC for photoelectron detector of short-wave high frequency IRFPA

    NASA Astrophysics Data System (ADS)

    Wang, Pan; Ding, Rui-jun; Chen, Guo-qiang; Chen, Honglei

    2013-01-01

    Design of readout-integrated circuit(ROIC) with high frequency and low signal for 512256 short wavelength(SW) inferred-focal-plane-arrays(IRFPAs) is presented. The ROIC with high performance in frame rate can integrate and read out the low signal. An analog signal chain, which contains CTIA, CDS module, amplifier of charge and complementary output stage, can satisfy the high frequency and low signal application. A reliable digital control structure of IRFPA ROIC is presented, with which the integral voltage of arbitrary contiguous or noncontiguous lines, rather than regular lines, can be selected to readout. The simulation and verification are completed both before and after completing the layout. The circuit's structure and operation principle are analyzed under the environment of mix-signal, and the result shows that the output dynamic range is over 2.5V, the charge capacity is more than 1Me-, the frame rate is 250Hz, the linearity within useful dynamic range is above 99.9 percent.

  20. A high-frequency warm shallow water acoustic communications channel model and measurements.

    PubMed

    Chitre, Mandar

    2007-11-01

    Underwater acoustic communication is a core enabling technology with applications in ocean monitoring using remote sensors and autonomous underwater vehicles. One of the more challenging underwater acoustic communication channels is the medium-range very shallow warm-water channel, common in tropical coastal regions. This channel exhibits two key features-extensive time-varying multipath and high levels of non-Gaussian ambient noise due to snapping shrimp-both of which limit the performance of traditional communication techniques. A good understanding of the communications channel is key to the design of communication systems. It aids in the development of signal processing techniques as well as in the testing of the techniques via simulation. In this article, a physics-based channel model for the very shallow warm-water acoustic channel at high frequencies is developed, which are of interest to medium-range communication system developers. The model is based on ray acoustics and includes time-varying statistical effects as well as non-Gaussian ambient noise statistics observed during channel studies. The model is calibrated and its accuracy validated using measurements made at sea. PMID:18189549

  1. The research of high-speed clock in space laser communication

    NASA Astrophysics Data System (ADS)

    Yang, Hong-kun; Tong, Shou-feng; Zhang, Lei; Wang, Hao-zeng

    2013-08-01

    Space laser communication is moving in a wider bandwidth, greater distances, is more accurate and more narrow laser communication beam direction, faster bandwidth as well as communication interface chip high-speed clock more demanding requirements of the low frequency noise, and good reliability, small size and low power consumption characteristics. Production of ADI's ADF4350 integrated voltage-controlled oscillator (VCO) bandwidth frequency synthesizer just to meet this requirement clock frequency This paper describes the basic principles and operating characteristics of the broadband frequency synthesizer. In this paper we use CPLD to control the ADF4350 and give a control electric circuit with CPLD structure and based on Verilog program. Simulation and experimental results show that the lock-in effect is good, easy to control, and reliable performance. It is able to generate stable clock, suitable for applications in laser communication.

  2. Effect of Short-Term Acclimatization to High Altitude on Sleep and Nocturnal Breathing

    PubMed Central

    Nussbaumer-Ochsner, Yvonne; Ursprung, Justyna; Siebenmann, Christoph; Maggiorini, Marco; Bloch, Konrad E.

    2012-01-01

    Study Objective: Objective physiologic data on sleep and nocturnal breathing at initial exposure and during acclimatization to high altitude are scant. We tested the hypothesis that acute exposure to high altitude induces quantitative and qualitative changes in sleep and that these changes are partially reversed with acclimatization. Design: Prospective observation. Setting: One night in a sleep laboratory at 490 meters, the first and the third night in a mountain hut at 4559 meters. Participants: Sixteen healthy mountaineers. Intervention: Altitude exposure. Measurements: Polysomnography, questionnaire evaluation of sleep and acute mountain sickness. Results: Compared to 490 m, median nocturnal oxygen saturation decreased during the 1st night at 4559 m from 96% to 67%, minute ventilation increased from 4.4 to 6.3 L/min, and the apnea-hypopnea index increased from 0.1 to 60.9/h; correspondingly, sleep efficiency decreased from 93% to 69%, and slow wave sleep from 18% to 6% (P < 0.05, all instances). During the 3rd night at 4559 m, oxygen saturation was 71%, slow wave sleep 11% (P < 0.05 vs. 1st night, both instances) and the apnea/hypopnea index was 86.5/h (P = NS vs. 1st night). Symptoms of AMS and of disturbed sleep were significantly reduced in the morning after the 3rd vs. the 1st night at 4559 m. Conclusions: In healthy mountaineers ascending rapidly to high altitude, sleep quality is initially impaired but improves with acclimatization in association with improved oxygen saturation, while periodic breathing persists. Therefore, high altitude sleep disturbances seem to be related predominantly to hypoxemia rather than to periodic breathing. Citation: Nussbaumer-Ochsner Y; Ursprung J; Siebenmann C; Maggiorini M; Bloch KE. Effect of short-term acclimatization to high altitude on sleep and nocturnal breathing. SLEEP 2012;35(3):419-423. PMID:22379248

  3. Communication of BRCA results and family testing in 1103 high-risk women

    PubMed Central

    Cheung, Eleanor L.; Olson, Ashley D.; Yu, Tina M.; Han, Pamela Z.; Beattie, Mary S.

    2011-01-01

    Background Genetic testing for hereditary cancer risk has implications for individuals and families. This study of women at risk of hereditary breast and ovarian cancer (HBOC) examines communication of BRCA results and subsequent genetic testing in the family. Methods We surveyed 1103 female BRCA testers at two hospitals, querying for communication of results and testing in relatives. Results 97% of participants communicated BRCA results with at least one relative. Communication was negatively associated with older age (OR=0.66 per decade, 95% CI=0.40.9), Asian race (OR=0.18, 95% CI=0.060.5), and testing at the public hospital vs. the cancer center (OR=0.19, 95% CI=0.070.5). Communication was positively associated with increased knowledge of HBOC screening and risk reduction recommendations (OR=1.9, 95% CI=1.13.4) and increased satisfaction with the decision to BRCA test (SWD) (OR=2.6, 95% CI=1.64.0). 75% of BRCA-positive participants reported at least one relative pursued genetic testing. Family testing was negatively associated with Asian race (OR=0.15, 95%CI=0.020.8), and positively associated with increased socioeconomic status (OR=1.4, 95%CI=1.11.7) and increased SWD (OR=2.1, 95% CI=1.14.1). Conclusion Despite high overall rates of communicating BRCA results, underserved and some minority women appear less likely to inform relatives of their BRCA status or have relatives test for a known family mutation. Satisfaction with the decision to BRCA test is positively associated with both outcomes. Impact This study identified several novel predictors of family communication and family genetic testing in a large population of high-risk women. This work can inform clinicians interested in improving family communication regarding cancer predisposition testing. PMID:20699375

  4. Designing and building an integrated target chamber system for high intensity short-pulse laser-target interaction experiments

    Microsoft Academic Search

    Kazuhito Yasuike; Satoshi Orimo; Mamiko Nishiuchi; Masayuki Suzuki; Kouji Matsukado; Hiroyuki Daido; Takashi Arisawa; Toyoaki Kimura; Toshiki Tajima

    2003-01-01

    We have recently designed and are building a plasma experiment chamber system for a high intensity short pulse Ti:sapphire 100 TW laser (lambda=800 nm, 2 J, 20 fs) at the Advanced Photon Research Center, JAERI. The expected primary use of the chamber is for high intensity (up to 1020 W cm-2) laser solid target experiments for hot electron, ion, and

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

    E-print Network

    California at Santa Cruz, University of

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

  6. RAPID COMMUNICATION BIOLOGICAL PERCHLORATE REDUCTION IN HIGH-SALINITY SOLUTIONS

    Microsoft Academic Search

    BRUCE E. LOGAN; JUN WU; RICHARD F. UNZ

    2001-01-01

    Perchlorate (ClO4 ? ) has been detected in numerous ground and surface waters, and has recently been added to the drinking water Candidate Contaminant List in the United States. Perchlorate can be removed from drinking water using ion exchange, but this results in the production of highly saline (7-12%) perchlorate-contaminated brines. Perchlorate-degrading microbial enrichments capable of growth in highly saline

  7. High-power HTS microstrip filters for wireless communication

    Microsoft Academic Search

    Guo-Chun Liang; Dawei Zhang; Chien-Fu Shih; M. E. Johansson; R. S. Withers; D. E. Oates; A. C. Anderson; P. Polakos; P. Mankiewich; E. de Obaldia; R. E. Miller

    1995-01-01

    The performance of narrowband microstrip filters with low insertion loss and high power-handling capabilities made from YBa2 Cu3O7-? (YBCO) high-temperature superconducting (HTS) thin films is presented. Results are shown for two different designs that were chosen to optimize the power-handling capability. Both filters have a 2-GHz center frequency and 5 poles that incorporate coupled resonators with 10-? internal impedances. They

  8. Risk factors among elderly for short term deaths related to high levels of air pollution

    PubMed Central

    Filleul, L; Baldi, I; Dartigues, J; Tessier, J

    2003-01-01

    Background: Air pollution has been linked to increased rates of mortality, but little is known about individual characteristics related to the increase in risk. Aims: To examine short term effects of air pollution on daily mortality in elderly people in Bordeaux and compare characteristics of subjects ?65 years old who died with levels of particulate air pollution. Methods: Daily mortality data from Bordeaux were used to determine the core model of mortality for the period 198897. The air pollution indicator was regressed on the core model of mortality, allowing control of the main effect modifiers and confounding factors of air pollution on the same day. The residual series of this regression model was classified from the lowest to the highest to determine "low level days" and "high level days". A sample of 1469 elderly people in a French cohort study were studied. Results: From 1988 to 1997, 543 subjects died; 55 deaths were during days with low air pollution and 51 during days with high air pollution. Only gender differed significantly according to both types of days, with a proportion of women significantly higher in high air pollution days than men. After adjustment for smoking habits, the odds ratio was 5.2 for women. Conclusion: The risk of mortality between women and men was determined on days with "high air pollution levels" above the 5090th centiles compared to below the 10th centile. No clear pattern was observed between days with low levels of air pollution and the different centiles of exposure. PMID:12937192

  9. Efficacy and safety of a short course of very-high-dose cholecalciferol in hemodialysis123

    PubMed Central

    Huang, Rong; Long, Qi; Singapuri, Salman; Raggi, Paolo; Tangpricha, Vin

    2012-01-01

    Background: Vitamin D deficiency is highly prevalent among hemodialysis patients, but little data exist in support of an optimal repletion regimen. Objective: The objective was to ascertain the efficacy of weekly very-high-dose cholecalciferol (vitamin D3) in correcting vitamin D insufficiency and deficiency in patients with stage 5D chronic kidney disease. Design: We conducted a prospective, double-blind, randomized controlled pilot study that compared placebo with very high doses of oral cholecalciferol for 3 wk (200,000 IU/wk) in hemodialysis patients. We examined the rate of correction of vitamin D insufficiency or deficiency and the effect of treatment on markers of mineral metabolism and routine laboratory variables. Results: Twenty-seven subjects received placebo, and 25 received cholecalciferol. The majority (94%) of subjects had serum 25-hydroxyvitamin D [25(OH)D] concentrations <30 ng/mL. Study groups were similar with respect to baseline clinical characteristics, with the exception of hemoglobin concentrations, which were lower in the cholecalciferol-treated group (P < 0.04). At follow-up, 90.5% of subjects treated with cholecalciferol achieved serum 25(OH)D concentrations ?30 ng/mL in contrast to 13.6% of the placebo group. There were no significant changes in serum calcium, phosphate, or intact parathyroid hormone during the study. Conclusion: Short-term, high-dose oral cholecalciferol treatment of vitamin D deficiency in hemodialysis patients appears to be effective and with no evidence of toxic effects. This trial was registered at clinicaltrials.gov as NCT00912782. PMID:22237061

  10. High Density Lipoproteins for the Systemic Delivery of short interfering RNA

    PubMed Central

    McMahon, Kaylin M.; Thaxton, C. Shad

    2014-01-01

    Introduction RNA interference (RNAi) is a powerful mechanism for gene silencing with the potential to greatly impact the development of new therapies for many human diseases. Short interfering RNAs (siRNAs) may be the ideal molecules for therapeutic RNAi. However, therapeutic siRNAs face significant challenges that must be overcome prior to widespread clinical use. Many efforts have been made to overcome the hurdles associated with systemic administration of siRNA; however, current approaches are still limited. As such, there is an urgent need to develop new strategies for siRNA delivery that have the potential to impact a broad spectrum of systemic diseases. Areas covered This review focuses on the promise of siRNA therapies and highlights current siRNA delivery methods. With an eye toward new strategies, this review first introduces high density lipoproteins (HDL) and their natural functions, and then transitions into how HDLs may provide significant opportunities as next generation siRNA delivery vehicles. Importantly, this review describes how synthetic HDLs leverage the natural ability of HDL to stabilize and deliver siRNAs. Expert Opinion HDLs are natural nanoparticles that are critical to understanding the systemic delivery of therapeutic nucleic acids, like siRNA. Methods to synthesize biomimetic HDLs are being explored and data demonstrate that this type of delivery vehicle may be highly beneficial for targeted and efficacious systemic delivery of siRNAs. PMID:24313310

  11. Optimal design of high frequency readout IC for short-wave IRFPA

    NASA Astrophysics Data System (ADS)

    Wang, Pan; Chen, Guo-qiang; Gao, Lei; Zhou, Jie; Ding, Rui-jun

    2012-12-01

    High frequency readout-integrated circuit(ROIC) of 512256 staring short wavelength(SW) infrared focal plane arrays(IRFPAs), focusing on high-frame rate output and noise suppression is implemented in this paper. The design of ROIC mentioned in it takes the previous version into account. The complete analog signal chain contains a novel input stage of capacitor feedback transimpedance amplifier(CTIA) preamplifier, a CDS (correlated double sampling) module, an amplifier of charge and complementary output stage. This ROIC is a full-custom flow integrated circuit design. The parasitic parameters are extracted once the layout is finished. Then the design is improved according to the result of post-layout simulation, which leads to the great improvements of the majority of parameters. The test and simulation results show that the output voltage range is 2.8V, the frame rate is 250Hz and the linearity within useful voltage range is above 99.1 percent, even when the temperature is 77K.

  12. MEMS technologies for enabling high frequency communications circuits

    Microsoft Academic Search

    Victor M. Lubecke; Jung-Chih Chiao

    1999-01-01

    Wireless systems requirements for increased data capacity and decreased size and power consumption have pushed radio frequency integrated circuit (RFIC) technology to extremes. Microelectromechanical systems (MEMS) techniques have been used to demonstrate high-efficiency microwave components that provide a means for economically extending silicon RFIC technology to microwave frequencies to meet these demands. MEMS techniques are also being applied to create

  13. Iterative interference cancellation for high spectral efficiency satellite communications

    Microsoft Academic Search

    Bassel F. Beidas; Hesham El Gamal; Stan Kay

    2002-01-01

    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

  14. EXPERIMENTAL ANALYSIS OF COMMUNICATIONS INTERFACES FOR HIGH-PERFORMANCE CLUSTERS

    Microsoft Academic Search

    Alan George; Robert Todd; William Phipps

    This paper provides experimental data and analysis to quantify both the peak and sustained performance characteristics of four of the most promising new networking technologies for interconnecting machines in a high-performance cluster of workstations. These technologies include Scalable Coherent Interface (SCI), Myrinet, Fibre Channel System (FCS), and Asynchronous Transfer Mode (ATM). Cluster networking performance experiments are conducted and measurements presented

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

    Microsoft Academic Search

    Y. Kim; E. Abou-Hamad; A. Rubio; T. Gberg; A. V. Talyzin; D. Boesch; S. Aloni; A. Zettl; D. E. Luzzi; C. Goze-Bac

    2010-01-01

    The understanding and control of the magnetic properties of carbon-based materials is of fundamental relevance in applications in nano- and biosciences. Ring currents do play a basic role in those systems. In particular the inner cavities of nanotubes offer an ideal environment to investigate the magnetism of synthetic materials at the nanoscale. Here, by means of 13C high resolution NMR

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

    E-print Network

    Ortiz, Pablo (Pablo Jose)

    2013-01-01

    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 ...

  17. VERY HIGH-SPEED DRILL STRING COMMUNICATIONS NETWORK

    SciTech Connect

    David S. Pixton

    2002-08-01

    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.

  18. The Influence of High and Low-Context Communication Styles On the Design, Content, and Language of Business-To-Business Web Sites

    Microsoft Academic Search

    Jean-Claude Usunier; Nicolas Roulin

    2010-01-01

    Language and communication, especially high- versus low-context communication styles, have been shown to lead to differences in Web sites. Low-context communication provides the lowest common denominator for intercultural communication through the Internet by making messages linear, articulated, explicit, and therefore easier to understand in the absence of contextual clues. Based on theories of intercultural business communication and recent empirical studies,

  19. Space Weather effects on airline communications in the high latitude regions

    NASA Astrophysics Data System (ADS)

    Honary, Farideh

    2014-05-01

    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

  20. Communication architecture tuners: a methodology for the design of high-performance communication architectures for system-on-chips

    Microsoft Academic Search

    Kanishka Lahiri; Anand Raghunathan; Ganesh Lakshminarayana; Sujit Dey

    2000-01-01

    In this paper, we present a general methodology for the design of custom system-on-chip communication architectures. Our technique is based on the addition of a layer of circuitry, called the Communica- tion Architecture Tuner (CAT), around any existing communication architecture topology. The added layer enhances the ability of the system to adapt to changing communication needs of its constituent components.

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

    Microsoft Academic Search

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

    1994-01-01

    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

  2. Buried Treasure: The Theory and Practice of Communicative Action in an Urban High School Newspaper.

    ERIC Educational Resources Information Center

    Novek, Eleanor M.

    An urban high school English/journalism class used the production of a community-focused newspaper as a strategy for the self-determination of young African Americans. The intervention emphasized social relations--focusing on specific verbal and social skills which young people can use in determining and reaching a variety of communication goals

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

    Microsoft Academic Search

    Lenos Trigeorgis; Sophocles Ioulianou

    2012-01-01

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

  4. Experimental Error Filtration for Quantum Communication Over Highly Noisy Channels L.-P. Lamoureux,1

    E-print Network

    Cerf, Nicolas

    Experimental Error Filtration for Quantum Communication Over Highly Noisy Channels L.-P. Lamoureux) Error filtration is a method for encoding the quantum state of a single particle into a higher applications. An alternative method, called error filtration, allows errors to be filtered out during quantum

  5. Communication Satisfaction, Organizational Citizenship Behavior and the Relationship to Student Achievement in High Schools

    ERIC Educational Resources Information Center

    Blanchard, Gayle A.

    2012-01-01

    This study used a correlational design that allowed the researcher to examine the relationship among communication satisfaction, organizational citizenship behaviors (OCB) and student achievement. High school teachers were surveyed from a convenience sample of 12 school districts in Arizona. Established instruments were used to survey

  6. Local Search Genetic Algorithm for Optimization of Highly Reliable Communications Networks

    E-print Network

    Smith, Alice E.

    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

  7. A case study in high-end communications technology in distance learning

    Microsoft Academic Search

    A. van Dam; A. Barr; D. Greenberg; R. Riesenfeld; H. Fuchs

    1996-01-01

    The five principal investigators (PIs) of the graphics and visualization center, a distributed NSF science and technology center, report on the lessons learned from reaching an interactive graduate-level seminar involving their five sites over a high-end communications infrastructure. The experiences related will be of value to institutions presently conducting or considering distance learning. Although the experiences reported here are based

  8. COMMUNICATIONS Photonic crystal-based resonant antenna with a very high directivity

    E-print Network

    Ozbay, Ekmel

    COMMUNICATIONS Photonic crystal-based resonant antenna with a very high directivity B. Temelkuran of growing interest for photonic crystal-based antennas.8,9 The reported experimental and theoretical stud- ies on the antenna applications mostly made use of the total reflection property of photonic crystals

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

    ERIC Educational Resources Information Center

    Spromberg, Sarah

    2011-01-01

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

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

    Microsoft Academic Search

    Changyuan Yu

    2005-01-01

    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

  11. Proton spectroscopy of human brain with very short echo time using high gradient amplitudes.

    PubMed

    Seeger, U; Klose, U; Seitz, D; Ngele, T; Lutz, O; Grodd, W

    1998-01-01

    In localized proton magnetic resonance spectroscopy very short echo times (TE) are achieved to diminish signal loss due to T2 relaxation and to avoid phase distortions due to J-coupling. A sequence for single volume spectroscopy in human brain is described with a TE as low as 5 ms. Examinations were performed on a 1.5 T whole-body imager with actively shielded gradients. A self-designed stimulated echo acquisition mode (STEAM) sequence with very high amplitude spoiling gradients of 24 mT/m was used to take advantage of the whole potential of the gradient system. Optimization of TE was carried out by controlling spectral quality and localization in both phantom and volunteer measurements. Proton spectra of human brain were acquired in 21 healthy volunteers. Spectra of occipital white matter, parieto-occipital grey/white matter, and cerebellum revealed none or only small eddy current distortions at a TE of 5 ms. The volume of interest was 8-12 ml, repetition time was 1.5 s, and mixing time was 5 ms. Peak ratios of major metabolites referring to creatine were estimated and the relative standard deviations were calculated to determine interindividual reproducibility. The relative standard deviation of myo-inositol ranged from 6% to 11% within these brain regions whereas for glutamine and glutamate 7% to 16% were found. PMID:9436947

  12. Temperature measurement by IR camera of heated device to high temperature during a short time

    NASA Astrophysics Data System (ADS)

    Sonneck-Museux, Nathanalle; Verg, Philippe; Judic, Jean-Pierre; Edard, Pierrick

    2015-04-01

    A device allowing heating a liquid to high temperatures during a very short time has been conceived in our laboratory. The goal of this survey is to find the suitable experimental configurations, so that tested material affected by the temperatures coved between 200 and 750C. This study is achieved to the Solar Furnace of the DGA in Odeillo. The cavity containing the liquid is a thermocouple sleeve (capillary) in Inconel 600. Its extremity is closed tightly by a removable steel plug permitting the tightness after replenishment. An electromagnet associated to a generator of delay permit to make fall the whole after the solar irradiation in liquid nitrogen in order to stop the reaction of "deterioration" of the tested product. According to capillary dimensions and to heating time, the temperature measurement using a pyrometer is not possible. A second possibility is using thermocouple, but it is not easy to join this captor on Inconel 600. Using by infrared camera allows observing the presence or the absence of inflammation during the solar irradiation and the sleeve fall too. The measures of temperatures by thermocouple show a lot of variability. The measures comparison with those by infrared camera shows a phenomenon of "heat well". Several score of tests to the solar furnace have been achieved in different experimental configurations. Nine experimental configurations have been validated, for variable flux of 100 to 500W/cm. The observation by infrared camera permitted to validate the conceived system and to verify the homogeneity of the sleeve heated.

  13. Over an octave cascaded Raman scattering in short highly germanium-doped silica fiber.

    PubMed

    Yin, Ke; Zhang, Bin; Yang, Weiqiang; Chen, Hongwei; Hou, Jing

    2013-07-01

    In this paper, we report on cascaded Raman scattering (RS) in a highly germanium-doped silica fiber (HGDF) pumped by a picosecond pulsed master oscillator power amplifier (MOPA) system at 1064 nm in the normal dispersion regime. Benefited by the higher Raman gain of germanium (GeO2) than silica in the core, the length of the HGDF is only several meters. The broadest output spectrum comprises of 10 orders Raman stokes waves and eventually evolves into a supercontinuum (SC) spanning from 1000 to beyond 2100 nm with an output average power up to Watt scale. To the best of our knowledge, this is the first time to obtain such a broad cascaded RS spectrum in a short length of GeO2-doped step index silica fiber. We also numerically investigate the propagation of picosecond pulses in this HGDF based on the generalized nonlinear Schrdinger equation (GNLSE) which includes most of the dispersive and nonlinear effects, and the simulation results are in fairly good agreement with our experiments. It is believed that the numerical approach adopted in this paper is very beneficial for designing customized cascaded Raman fiber lasers before experimental implementations. PMID:23842385

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

    NASA Astrophysics Data System (ADS)

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

    2012-06-01

    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.

  15. High-fidelity rotor gap measurements in a short-duration turbine rig

    NASA Astrophysics Data System (ADS)

    Lavagnoli, Sergio; Paniagua, Guillermo; Tulkens, Maxime; Steiner, Alexander

    2012-02-01

    The distance between the tip of rotating airfoils and the stationary casing, i.e., the tip clearance, is a vital parameter to characterize turbomachinery performance. The larger the tip clearance, the lower the turbine efficiency due to the increased loss associated with the hot jet flowing through the gap without generating work. Following the increasing demands in efficiency, these small clearances must be surveyed to avoid mechanical rubbing. The appropriate design of control systems to adjust these small clearances requires a constant monitoring during the whole engine envelope. This paper describes the complete implementation of a high-frequency capacitive sensor on the shroud of a large transonic turbine stage. The presented system and data analysis procedure allow the accurate measurement of the tip clearance of each rotating airfoil. The measurement system performances are first assessed in a simplified test bench and uncertainty analysis is provided. The technique is demonstrated in an aero-propulsion turbine, tested in a short duration rig. The turbine facility has running times of less than 0.5 s, characterized by temperature and rotor speed transients, which requires particular in-situ sensor calibrations. Extensive running tip clearance measurements of the large aero-engine turbine stage validate the system concept and design.

  16. Short-range variability of soil pH in a regional geochemical survey, communicating uncertainty to the data user

    NASA Astrophysics Data System (ADS)

    Ander, Louise; Knights, Kate; Lark, Murray

    2015-04-01

    The north of Ireland is well-furnished with geochemical data after completion of the Tellus survey of Northern Ireland and the Tellus Border survey of six northern counties of the Republic of Ireland. These data are of considerable interest to the agricultural sector, in particular the data on soil pH. However, a geochemical survey at regional scale cannot resolve significant variation of soil pH, in particular effects of soil management and fine-scale variation of superficial material. This leads to uncertainties in the mapped soil pH which must be accounted for when making decisions about management interventions, including more detailed local sampling. In this poster we show how uncertainty of predicted soil pH, relative to established threshold values, can be quantified by disjunctive kriging. The uncertainty is expressed in terms of probabilities. We show how this can be communicated to the data user by means of the calibrated phrases of the IPCC, using results from recent research on its efficacy to modify its presentation.

  17. The communicative process of drug resistance among high school students.

    PubMed

    Alberts, J K; Hecht, M L; Miller-Rassulo, M; Krizek, R L

    1992-01-01

    This article reports the results of the second of two studies designed to examine social influences on adolescents' responses to drug offers. In the first study, a typology of both drug offers and drug resistance strategies was developed. The present study provides an analysis of the associations between offers and resistance and the differences between drug and alcohol offers. To accomplish this, sixty-nine narrative accounts of both successful and unsuccessful attempts to say no were collected from high school students. Analysis of the interviews indicated that peer pressure was applied in approximately 70% of the offers; however, much of that pressure was applied after the initial offer had been refused. It also was determined that simple offers were more likely with alcohol, while drug offers were more likely to be persuasive and involve pressure during the initial offer. PMID:1539497

  18. Overview of the preliminary design of the Optical Communication Demonstration and High-Rate Link Facility

    NASA Astrophysics Data System (ADS)

    Sandusky, John V.; Jeganathan, Muthu; Ortiz, Gerry G.; Biswas, Abhijit; Lee, Sukhan; Parker, George; Liu, Brad; Johnson, Donald R.; De Pew, Jon; Lesh, James R.

    1999-04-01

    This 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.

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

    NASA Technical Reports Server (NTRS)

    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

    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.

  20. Joint Access Control Based on Access Ratio and Resource Utilization for High-Speed Railway Communications

    NASA Astrophysics Data System (ADS)

    Zhou, Yuzhe; Ai, Bo

    2015-05-01

    The fast development of high-speed rails makes people's life more and more convenient. However, provisioning of quality of service of multimedia applications for users on the high-speed train is a critical task for wireless communications. Therefore, new solutions are desirable to be found to address this kind of problem. Current researches mainly focus on providing seamless broadband wireless access for high-speed mobile terminals. In this paper, an algorithm to calculate the optimal resource reservation fraction of handovers is proposed. A joint access control scheme for high-speed railway communication handover scenario is proposed. Metrics of access ratio and resource utilization ratio are considered jointly in the analysis and the performance evaluation. Simulation results show that the proposed algorithm and the scheme improve quality of service compared with other conventional schemes.

  1. High-speed non-directional infrared communication for wireless local-area networks

    Microsoft Academic Search

    J. M. Kahn; J. R. Barry; W. J. Krause; M. D. Audeh; J. B. Carruthers; G. Messerschmitt; E. A. Lee; D. G. Messerschmitt

    1992-01-01

    The use of wide-area infrared beams to establish high-speed digital links between portable terminals and a base station, allowing construction of in-building wireless local-area networks, is discussed. Key impairments to high-speed communication using nondirectional infrared links, namely, small received power in the face of potentially intense ambient infrared radiation and intersymbol interference caused by multipath optical propagation, are examined. Transmitter

  2. Receiver designs and channel characterization for multi-spot high-bit-rate wireless infrared communications

    Microsoft Academic Search

    S. Jivkova; Mohsen Kavehrad

    2001-01-01

    This paper addresses one of the most promising candidates for high-speed in-house wireless communications, namely, the multi-spot diffusing configuration (MSDC). Since it uses the optical infrared medium for data transmission, it has the inherent potential for achieving very high capacities. The channel characteristics in MSDC are simulated and the causes for channel distortion are analyzed. Then, conditions for creation of

  3. High-speed MB-OFDM system with multiple antennas for multimedia communication and home network

    Microsoft Academic Search

    Bon-Wook Koo; Myung-Sun Baek; Young-Hwan You; Hyoung-Kyu Song

    2006-01-01

    The rapid dissemination of digital consumer electronics devices within home and personal area causes increments of multimedia communication and of home networking. In order to meet the demand for low cost, high performance wireless entertainment network, multiple transmitting and receiving antennas can be used in MB-OFDM system to attain high-rate transmission and to offer better quality of service. The MB-OFDM

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

    NASA Technical Reports Server (NTRS)

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

    1980-01-01

    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.

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

    PubMed

    Ito, Takehiko

    2013-12-01

    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

  6. THERMAL INACTIVATION OF FOOT-AND-MOUTH DISEASE VIRUS IN MILK USING HIGH-TEMPERATURE SHORT TIME PASTEURIZATION

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Previous studies of laboratory simulation of high temperature short time pasteurization (HTST) to eliminate foot-and-mouth disease virus (FMDV) in milk have shown that the virus is not completely inactivated at the legal pasteurization minimum (71.7 deg C/15 sec) but is inactivated in flow apparatus...

  7. Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses

    E-print Network

    Limpouch, Jiri

    Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double laser-produced plasmas are bright ultrafast line x-ray sources potentially suitable for different onto a solid target into the x-ray emission is significantly enhanced when a laser prepulse precedes

  8. LOGAN, ANDREW THOMAS. Short-Term Material Properties of High-Strength Concrete (Under the direction of Amir Mirmiran)

    E-print Network

    . Finally, I would like to thank Ready Mixed Concrete Co. in Raleigh, North Carolina for the effortsABSTRACT LOGAN, ANDREW THOMAS. Short-Term Material Properties of High-Strength Concrete (Under the direction of Amir Mirmiran) The need to extend the applicability of the AASHTO LRFD Bridge Design

  9. Title: Combined passive detection and ultrafast active imaging of cavitation events induced by short pulses of high intensity

    E-print Network

    Boyer, Edmond

    ;58(3):517-32" DOI : 10.1109/TUFFC.2011.1836 #12;2 Bubble nucleation was induced with a focused transducer (660kHz, f is possible using short ultrasonic excitations of high amplitude, and is required for ultrasound cavitation1-10Jul2011 Author manuscript, published in "IEEE Trans Ultrason Ferroelectr Freq Control 2011

  10. Combined passive detection and ultrafast active imaging of cavitation events induced by short pulses of high-intensity ultrasound

    Microsoft Academic Search

    Jrme Gateau; Jean-Franois Aubry; Mathieu Pernot; Mathias Fink; Mickal Tanter

    2011-01-01

    The activation of natural gas nuclei to induce larger bubbles is possible using short ultrasonic excitations of high amplitude, and is required for ultrasound cavitation ther- apies. However, little is known about the distribution of nuclei in tissues. Therefore, the acoustic pressure level necessary to generate bubbles in a targeted zone and their exact location are currently difficult to predict.

  11. High Bandwidth Synaptic Communication and Frequency Tracking in Human Neocortex

    PubMed Central

    Testa-Silva, Guilherme; Verhoog, Matthijs B.; Linaro, Daniele; de Kock, Christiaan P. J.; Baayen, Johannes C.; Meredith, Rhiannon M.; De Zeeuw, Chris I.; Giugliano, Michele; Mansvelder, Huibert D.

    2014-01-01

    Neuronal firing, synaptic transmission, and its plasticity form the building blocks for processing and storage of information in the brain. It is unknown whether adult human synapses are more efficient in transferring information between neurons than rodent synapses. To test this, we recorded from connected pairs of pyramidal neurons in acute brain slices of adult human and mouse temporal cortex and probed the dynamical properties of use-dependent plasticity. We found that human synaptic connections were purely depressing and that they recovered three to four times more swiftly from depression than synapses in rodent neocortex. Thereby, during realistic spike trains, the temporal resolution of synaptic information exchange in human synapses substantially surpasses that in mice. Using information theory, we calculate that information transfer between human pyramidal neurons exceeds that of mouse pyramidal neurons by four to nine times, well into the beta and gamma frequency range. In addition, we found that human principal cells tracked fine temporal features, conveyed in received synaptic inputs, at a wider bandwidth than for rodents. Action potential firing probability was reliably phase-locked to input transients up to 1,000 cycles/s because of a steep onset of action potentials in human pyramidal neurons during spike trains, unlike in rodent neurons. Our data show that, in contrast to the widely held views of limited information transfer in rodent depressing synapses, fast recovering synapses of human neurons can actually transfer substantial amounts of information during spike trains. In addition, human pyramidal neurons are equipped to encode high synaptic information content. Thus, adult human cortical microcircuits relay information at a wider bandwidth than rodent microcircuits. PMID:25422947

  12. Metastable States in High Order ShortRange Spin Viviane M. de Oliveira a , J. F. Fontanari a , and Peter F.

    E-print Network

    Stadler, Peter F.

    Metastable States in High Order ShortRange Spin Glasses Viviane M. de Oliveira a , J. F. Fontanari Abstract. The mean number #N # of metastable states in higher order short range spin glasses is estimated; Metastability in Short Range Spin Models 2 1. Introduction The notion of an (adaptive) landscape has proved

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

    E-print Network

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

    2007-03-23

    The redshift distribution of the short-duration 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 (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 1/3-2/3 of all short GRBs originate at higher redshifts than previously determined. This has two important implications: (i) We constrain the acceptable age distributions to a wide lognormal (sigma>1) with tau~4-8 Gyr, or to a power law, P(tau)~tau^n, with -1energies, E_{gamma,iso}~10^50-10^52 erg, are significantly larger than ~10^48-10^49 erg for the low redshift short GRBs, indicating a large spread in energy release or jet opening angles. Finally, we re-iterate the importance of short GRBs as potential gravitational wave sources and find a conservative Advanced LIGO detection rate of ~2-6 yr^-1.

  14. An Ultra-High Discrimination Y Chromosome Short Tandem Repeat Multiplex DNA Typing System

    PubMed Central

    Hanson, Erin K.; Ballantyne, Jack

    2007-01-01

    In forensic casework, Y chromosome short tandem repeat markers (Y-STRs) are often used to identify a male donor DNA profile in the presence of excess quantities of female DNA, such as is found in many sexual assault investigations. Commercially available Y-STR multiplexes incorporating 1217 loci are currently used in forensic casework (Promega's PowerPlex Y and Applied Biosystems' AmpFlSTR Yfiler). Despite the robustness of these commercial multiplex Y-STR systems and the ability to discriminate two male individuals in most cases, the coincidence match probabilities between unrelated males are modest compared with the standard set of autosomal STR markers. Hence there is still a need to develop new multiplex systems to supplement these for those cases where additional discriminatory power is desired or where there is a coincidental Y-STR match between potential male participants. Over 400 Y-STR loci have been identified on the Y chromosome. While these have the potential to increase the discrimination potential afforded by the commercially available kits, many have not been well characterized. In the present work, 91 loci were tested for their relative ability to increase the discrimination potential of the commonly used core Y-STR loci. The result of this extensive evaluation was the development of an ultra high discrimination (UHD) multiplex DNA typing system that allows for the robust co-amplification of 14 non-core Y-STR loci. Population studies with a mixed African American and American Caucasian sample set (n?=?572) indicated that the overall discriminatory potential of the UHD multiplex was superior to all commercial kits tested. The combined use of the UHD multiplex and the Applied Biosystems' AmpFlSTR Yfiler kit resulted in 100% discrimination of all individuals within the sample set, which presages its potential to maximally augment currently available forensic casework markers. It could also find applications in human evolutionary genetics and genetic genealogy. PMID:17668066

  15. Short communication Prospecting for water in the transition zone: d ln(Vs)/d ln(Vp)

    E-print Network

    Alf, Dario

    value of R in the upper mantle and transition zone can discriminate between lateral variations of water content and temperature as the ori- gin of lateral seismic variations. Published by Elsevier B.V. 1 and insensitive to other variables that are themselves poorly con- strained. Seismic velocities provide high

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

    PubMed

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

    2014-04-01

    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

  17. Short communication: Milk meal pattern of dairy calves is affected by computer-controlled milk feeder set-up.

    PubMed

    Jensen, M B

    2009-06-01

    Ninety-six calves housed in groups of 8 were fed either a high milk allowance (heavy breeds 9.6 L/d; Jerseys 7.2 L/d) or a low milk allowance (heavy breeds 4.8 L/d; Jerseys 3.6 L/d) via a computer-controlled milk feeder. Half of the calves on each allowance could ingest the milk in 2 or more daily milk portions, whereas the other half could ingest the milk in 4 or more daily portions. Data were collected during 3 successive 14-d periods, the first period starting the day after introduction to the feeder at minimum 12 d of age. High-fed calves ingested their milk in 4.0 and 4.9 meals for a minimum of 2 and 4 portions, respectively, whereas low-fed calves ingested their milk in 2.4 and 4.4 meals for a minimum of 2 and 4 portions, respectively. Calves on a high milk allowance had fewer milk meals over time, whereas calves on a low milk allowance had the same number of milk meals throughout. Thus, the development from small and frequent milk meals to fewer and larger meals reported by studies of natural suckling was also found among high-fed calves on a computer-controlled milk feeder. Irrespectively of minimum number of milk portions, the low-fed calves had more unrewarded visits to the computer-controlled milk feeder, indicating that they were attempting to get more milk. The results of the present study suggest that offering a high milk allowance and avoiding restriction on meal pattern may result in a feeder use that more closely resembles natural suckling. PMID:19448022

  18. 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)

    Boroson, Don M.; Robinson, Bryan S.

    2014-12-01

    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.

  19. NEAR-SURFACE CAVITY DETECTION BY HIGH-RESOLUTION SEISMIC REFLECTION METHODS USING SHORT-SPACING TYPE LAND STREAMER

    Microsoft Academic Search

    Tomio INAZAKI; Shigeki KAWAMURA; Oshie TAZAWA; Yoshihiro YAMANAKA; Naomi KANO

    High-resolution seismic reflection surveying by means of short-spacing type Land Streamers was conducted to detect near-surface cavities. The target cavities were inferred to have high potentiality of collapsing because they had been excavated about 60 years ago as air-raid shelter tunnels or drifts of lignite mines. Until now, several surface geophysical methods have been applied to the cavity detection, however,

  20. Small-bandgap polymer solar cells with unprecedented short-circuit current density and high fill factor.

    PubMed

    Choi, Hyosung; Ko, Seo-Jin; Kim, Taehyo; Morin, Pierre-Olivier; Walker, Bright; Lee, Byoung Hoon; Leclerc, Mario; Kim, Jin Young; Heeger, Alan J

    2015-06-01

    Small-bandgap polymer solar cells (PSCs) with a thick bulk heterojunction film of 340 nm exhibit high power conversion efficiencies of 9.40% resulting from high short-circuit current density (JSC ) of 20.07 mA cm(-2) and fill factor of 0.70. This remarkable efficiency is attributed to maximized light absorption by the thick active layer and minimized recombination by the optimized lateral and vertical morphology through the processing additive. PMID:25899940

  1. Short communication An application of artificial reefs to reduce organic enrichment caused by net-cage fish farming: preliminary results

    Microsoft Academic Search

    Dror L. Angel; Ehud Spanier

    Two artificial reefs made of porous recycled high-density polyethylene fence material were moored on the sea floor (20-m depth) off the North Beach of Eilat (Gulf of Aqaba, Red Sea) in April 1999. One reef was situated below a commercial net-cage fish farm, and a control reef was deployed outside the area of direct influence of the farm. The objective

  2. Means and method for characterizing high power, ultra short laser pulses in a real time, on line manner

    DOEpatents

    Veligdan, James T. (Manorville, NY)

    1994-01-01

    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.

  3. Calibration of the effective spring constant of ultra-short cantilevers for a high-speed atomic force microscope

    NASA Astrophysics Data System (ADS)

    Song, Yun-Peng; Wu, Sen; Xu, Lin-Yan; Zhang, Jun-Ming; Dorantes-Gonzalez, Dante J.; Fu, Xing; Hu, Xiao-Dong

    2015-06-01

    Ultra-short cantilevers are a new type of cantilever designed for the next generation of high-speed atomic force microscope (HS-AFM). Ultra-short cantilevers have smaller dimensions and higher resonant frequency than conventional AFM cantilevers. Moreover, their geometry may also be different from the conventional beam-shape or V-shape. These changes increase the difficulty of determining the spring constant for ultra-short cantilevers, and hence limit the accuracy and precision of force measurement based on a HS-AFM. This paper presents an experimental method to calibrate the effective spring constant of ultra-short cantilevers. By using a home-made AFM head, the cantilever is bent against an electromagnetic compensation balance under servo control. Meanwhile the bending force and the cantilever deflection are synchronously measured by the balance and the optical lever in the AFM head, respectively. Then the effective spring constant is simply determined as the ratio of the force to the corresponding deflection. Four ultra-short trapezoid shape cantilevers were calibrated using this method. A quantitative uncertainty analysis showed that the combined relative standard uncertainty of the calibration result is less than 2%, which is better than the uncertainty of any previously reported techniques.

  4. Short communication: Amino trap column improves the separation of methylimidazoles, 5-hydroxymethyl-2-furaldehyde, and sugars in Maillard reaction.

    PubMed

    Xu, Xian-Bing; Liu, Ding-Bo; Yu, Shu-Juan; Zhao, Zhen-Gang; Yu, Pei

    2014-11-01

    A simultaneous analysis of methylimidazoles, reducing sugars, and 5-hydroxymethyl-2-furaldehyde in the Maillard reaction was improved by use of an amino trap column. Analysis was carried out by using high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD) coupled with an amino trap column. The amino trap column was a useful tool to improve the separation of methylimidazoles, reducing sugars, and 5-hydroxymethyl-2-furaldehyde. This technique is useful for simultaneous analysis of methylimidazoles, reducing sugars, and 5-hydroxymethyl-2-furaldehyde in risk assessment for dairy products. PMID:25200783

  5. A High-Speed Optical Modem Communication System for CORK Seafloor Observatories

    NASA Astrophysics Data System (ADS)

    Farr, N.; Tivey, M.; Ware, J.; Pontbriand, C.; Pelletier, L. P.

    2014-12-01

    High-speed communications underwater is an increasing requirement for data intensive seafloor sensors. Acoustic modems provide dependable long-range communications underwater, but data rates are limited to <57Kbps. Free-water optical modems (OMs) offer high data rate, 10Mbps communications over a range of 200 m - a distance for ROVs, AUVs or wire-lowered packages to communicate without the need to directly plug-in or retrieve the instrument. Over the past 4 years, we have demonstrated the functionality and utility of OM technology using a CORK borehole observatory as a test case. A CORK represents all of the basic components required for a seafloor observatory: a stable environment for long-term continuous measurements of earth and ocean phenomena, access to a unique environment below the seafloor and a standard communication interface. The CORK-OM features a high-bandwidth, low-latency optical system based on LED emitters and PMT receivers and an acoustic command and control system. OM tests established a communication link from 20 to 200 meters range at rates of 1, 5 and 10 Mbps with no bit errors. The seafloor OM was plugged into the CORK's existing underwater wet mateable connector and provided additional power to the CORK to boost the data rate to 1 Hz from the normal 1 minute sample period. To communicate with the seafloor CORK-OM, a number of different modalities were used. One method was an OM mounted to a CTD frame on a lowered wire from a ship with an SDSL link over the conducting wire. Other methods utilized OMs mounted to both ROV Jason and submersible Alvin. We deployed OMs at two CORKs in 2012 in the northeast pacific at sites 857D and 1025C. The CORKs were visited in 2013 by a vessel of opportunity to download data and were put into sleep mode. The CORKs were revisited in 2014, woken up and successfully interrogated for data. ALVIN retrieved the CORK-OMs for corrosion, biofouling and battery performance assessment. We also performed tests of a next generation OM using a deployed seafloor modem and AUV Sentry. A complete lambertian optical field was quantitatively mapped by Sentry and test data was successfully downloaded from 20 to 150 m slant range. The AUV modality demonstrates the capability of 'data-mule' operations to autonomously recover data from a seafloor observatory with minimal human intervention.

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

    PubMed Central

    Lindberg, D A; Humphreys, B L

    1995-01-01

    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

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

    SciTech Connect

    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

    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.

  8. Short communication: radio frequency dielectric heating of nonfat dry milk affects solubility and whey protein nitrogen index.

    PubMed

    Chen, C; Michael, M; Phebus, R K; Thippareddi, H; Subbiah, J; Birla, S L; Schmidt, K A

    2013-03-01

    The US infant formula market is estimated at over $3.5 billion, of which 75% are dairy-based formulas. Dried dairy powders pose a significant food safety risk, with Cronobacter sakazakii and Salmonella spp. being pathogens of particular concern. Radio frequency dielectric heating (RFDH) can provide rapid, uniform heat treatment of dry powders; thus, it potentially may be used as a postprocess lethality treatment for nonfat dry milk (NDM) or powdered infant formula. Because RFDH is a heat treatment, the functionality of the NDM may be altered and should be evaluated. High heat- and low heat-NDM were RFDH processed at temperatures ranging from 75 to 90C for 5 to 125 min. Products were then assessed for whey protein nitrogen index (WPNI), solubility, and color. In low heat-NDM, RFDH decreased WPNI and solubility if the process was done at ? 80C; however, in high heat-NDM, RFDH had a greater effect on solubility than WPNI and some color properties were altered. Further investigation of RFDH is merited to validate its application as a pathogen control process for NDM across processing parameters that result in acceptable functional properties for infant formula and other food products containing NDM. PMID:23332848

  9. Large-amplitude plasma wave generation with a high-intensity short-pulse beat wave.

    PubMed

    Walton, B; Najmudin, Z; Wei, M S; Marle, C; Kingham, R J; Krushelnick, K; Dangor, A E; Clarke, R J; Poulter, M J; Hernandez-Gomez, C; Hawkes, S; Neely, D; Collier, J L; Danson, C N; Fritzler, S; Malka, V

    2002-12-15

    A short-pulse laser beat wave scheme for advanced particle accelerator applications is examined. A short, intense (3-ps, >10(18)-W cm(-2)) two-frequency laser pulse is produced by use of a modified chirped-pulse amplification scheme and is shown to produce relativistic plasma waves during interactions with low-density plasmas. The generation of plasma waves was observed by measurement of forward Raman scattering. Resonance was found to occur at an electron density many times that expected, owing to ponderomotive displacement of plasma within the focal region. PMID:18033483

  10. Short communication: Genetic analysis for fertility traits of heifers and cows from smallholder dairy farms in a tropical environment.

    PubMed

    Buaban, S; Duangjinda, M; Suzuki, M; Masuda, Y; Sanpote, J; Kuchida, K

    2015-07-01

    The objective of this study was to estimate genetic parameters for various fertility traits on Holstein upgraded dairy heifers and cows in a smallholder system under tropical conditions using data sets from the Thailand national recording scheme. The investigated traits were age at first service (AFS), age at first calving (AFC), days from calving to first service (DTFS), days between first and last service (DFLS), days open (DO), calving interval (CI), number of services per conception (NSPC), and conception at first service (FSC). The data consisted of 68,555, 34,401, and 54,004 records on heifers, primiparous, and multiparous cows, respectively, calving between 1996 and 2011. Gibbs sampling was employed to obtain (co)variance components using both univariate and bivariate analyses with linear and threshold animal models. Virgin heifers had better fertility performance than primiparous and multiparous cows. The reproductive performance in primiparous cows was inferior compared with multiparous cows. Cows with higher Holstein-Friesian blood showed lower reproductive efficiency. Estimated heritabilities for most of the fertility traits were 0.04 or less except for AFS (0.26) and AFC (0.25). The estimated genetic correlations among fertility traits within parity indicated that selection for cows with high conception rate could lead to shortened DO and CI, as well as DTFS. The FSC and NSPC could be used as the best indicators for heifer and cow fertility and could be complemented by other traits, which were genetically considered as different traits such as DTFS and DFLS in terms of a fertility index. This would enable efficient selection for better fertility. Genetic correlations for fertility traits in primiparous and multiparous cows were very high (>0.90), but those between heifers and cows were lower (0.03 to 0.83). The latter results indicated that fertility traits of heifers and cows should be considered as different traits. PMID:25981071

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

    PubMed Central

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

    2011-01-01

    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

  12. Performance analysis of high altitude platform multi-hop optical communication with non-regenerative system

    NASA Astrophysics Data System (ADS)

    Wang, Xiang; Zhao, Shang-hong; Shi, Lei; Li, Yong-jun; Zheng, Guang-wei; Zhao, Gu-hao; Zhu, Zi-hang

    2013-08-01

    Based on non-regenerative relays, the bit error probability expressions of CSI-assisted relay and fixed-gain relays for high altitude platform multi-hop optical communication is given. The effect of the factors, including atmospheric turbulence pointing error and relay node position, on the performance of multi-hop optical links is analyzed. The simulation results show that the influence of atmospheric turbulence on optical links is greater than that of pointing error. The improvement of average SNR per hop and transmit power on multi-hop optical communications may be restricted by pointing error. Compared to CSI-assisted relay, fixed-gain relay is suited to more hops links with the condition of high average SNR per hop.

  13. Wireless infrared communications

    Microsoft Academic Search

    JOSEPH M. KAHN; JOHN R. BARRY

    1997-01-01

    The use of infrared radiation as a medium for high-speed short-range wireless digital communication is discussed. Available infrared links and local-area networks are described. Advantages and drawbacks of the infrared medium are compared to those of radio and microwave media. The physical characteristics of infrared channels using intensity modulation with direct detection (IM\\/DD) are presented including path losses and multipath

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

    Microsoft Academic Search

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

    1998-01-01

    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

  15. Components of high-performance computing and communication in the behavioral sciences

    Microsoft Academic Search

    John E. Mertz

    1997-01-01

    By its very nature, the spectrum of computational problems approached in the behavioral sciences necessitates the use of almost\\u000a all elements of high-performance computing and communication. The salient performance issues of various componentsnetworking,\\u000a disk and tape storage, memoryprocessor configurations, and processing elementsare discussed. Hardware, software, and application\\u000a issues surrounding parallel computing performance are also discussed.

  16. Joint Statistics and MLSD in Filtered Incoherent High-Speed Fiber-Optic Communications

    Microsoft Academic Search

    Nikola Alic; Magnus Karlsson; M. Sko?ld; Olgica Milenkovic; P. A. Andrekson; Stojan Radic

    2010-01-01

    In this paper, signal statistics and their utilization for detection in narrowly filtered equalized high-speed fiber-optic communications are investigated experimentally. Tradeoffs between log-likelihood metric applications and oversampling are covered in detail. It is, for the first time, demonstrated that performance loss in bandwidth-limited systems can be nearly fully recovered (to within 0.5 dB) by taking advantage of bandwidth-limitation-induced noise correlations

  17. Random access protocols for high-speed interprocessor communication based on an optical passive star topology

    Microsoft Academic Search

    Patrick W. Dowd

    1991-01-01

    A multiple-instruction multiple-data (MIMD) distributed memory parallel computer system environment is considered. Media access control protocols that maintain good performance with high capacity optical channels are investigated. Three examples of star-coupled structures are introduced, one of which exhibits optical self-routing. Self-routing single-step optically interconnected communication structures can be designed through the incorporation of agile laser diode sources and wavelength tunable

  18. Short communication: Characteristics of proteolytic activities of endo- and exopeptidases in alfalfa herbage and their implications for proteolysis in silage.

    PubMed

    Tao, L; Guo, X S; Zhou, H; Undersander, D J; Nandety, A

    2012-08-01

    The pH optimum and thermostability of both exopeptidases and endopeptidases were investigated in this study to elucidate the possible role of plant proteases in proteolysis during ensiling of alfalfa herbage. Proteolytic activities of 4 classes of endopeptidases (i.e., serine, metallo, aspartic, and cysteine peptidase) and 5 classes of exopeptidases (i.e., aminopeptidase, carboxypeptidase, dipeptidase, dipeptidyl-peptidase, and tripeptidyl-peptidase) were examined within pH values of 3 to 9, and within temperatures from 20 to 90C. Serine and metalloproteases, the principal endopeptidases that hydrolyzed most of the protein to nonprotein nitrogen in alfalfa silage, had optimum activities at pH 4. Among the major exopeptidases contributing protein degradation in ensiled alfalfa, dipeptidase and tripeptidyl-peptidase had stable activities between pH 4 and 6, and carboxypeptidase activity was optimal at pH 5. The optimum temperature for most peptidase activities was 40C. Proteolytic activities of both endo- and exopeptidases increased with the elevation of incubating temperature from 20 to 40C. The pH value in well-preserved alfalfa silage is often above 4.0, and the temperatures in the ensiled mass range from 25 to 40C. Therefore, high proteolytic activities between pH 4 and 6 and the temperature range of ensiled alfalfa suggest that plant peptidases play a role in hydrolyzing protein during prolonged storage. PMID:22818473

  19. Design and evaluation of a 2-Mb/s GMSK modem for short-distance infrared wireless communications

    NASA Astrophysics Data System (ADS)

    Perez-Jimenez, Rafael; Montelongo, Cesar; Rabadan Borges, Jose A.

    1999-12-01

    A carrier-based modem for an IR Wireless LAN (IR-WLAN) design is presented. It is based on GMSK modulation schemes. This modem is capable of operating at 2 Mb/s, but it can easily modify to work up to 4.8 Mb/s. GMSK Schemes are filtered modulation schemes with higher spectral efficiency and robustness against jitter than basic FSK. The emitter uses a pulse-conformation stage for full-digital gaussian pulse conformation. Transitions are codified and the resulting waveform is similar to the output of a gaussian filter. The main applications of the proposed GMSK modem are in the area of a full-duplex IR link. And can be applied either in point-to-point links or into a local area network. It can work without interference wither with IrDA systems (even with the proposed PPM 4.4 Mb/s link) or with IEEE 802.11-baseband link (1 or 2 Mb/s). It is also more spectral efficient and jitter resistant than PPM. Carrier-based systems can be used either in point-to-point links or in diffuse systems. For diffuse systems, this modem assumes a high level of use of the available IR spectrum, supporting at least 4 channels in a 30 MHz bandwidth. We also compare the performances of GMSK with other schemes (as can be OQPSK or FQPSK-2).

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

    SciTech Connect

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

    2008-05-16

    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.

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

    Microsoft Academic Search

    Wade Enright; Pat Bodger

    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

  2. Sustained Silent Reading and Young Adult Short Stories for High School Classes.

    ERIC Educational Resources Information Center

    Jensen, Terry L.; Jensen, Valarie S.

    2002-01-01

    Describes the implementation of a version of Sustained Silent Reading (SSR), called the DEAR (Drop Everything And Read) program, throughout their school. Presents their experience with the program in the KWL format (what we KNOW, what we WANTED to know, and what we LEARNED). Provides a bibliography of 12 young adult short stories used in the

  3. High-resolution short-range wideband FMCW radar measurements based on MUSIC algorithm

    Microsoft Academic Search

    M. A. Abou-Khousa; D. L. Simms; S. Kharkovsky; R. Zoughi

    2009-01-01

    This paper is focused on utilizing short-range wideband FMCW radar measurements to evaluate multilayered dielectric structures. The performance of the MUSIC algorithm in resolving closely-spaced spectral lines corresponding to adjacent boundaries within such structures is investigated experimentally.

  4. Short-circuit tests on a high-voltage, cable-wound hydropower generator

    Microsoft Academic Search

    Stefan G. Johansson; Bertil Larsson

    2004-01-01

    Data from measurements on the first Powerformer generator installed in Porjus, Sweden, will be presented. The generator has a rating of 45 kV and 11 MVA. In total, the machine has been running more than 13700 h (October 2001) and has been exposed to a number of different tests including short-circuit tests on the terminal at 100% magnetization. Experience and

  5. Advances in the analysis of short span railway bridges for high-speed lines

    Microsoft Academic Search

    P Museros; M. L Romero; A Poy; E Alarcn

    2002-01-01

    The physical model based on moving constant loads is widely used for the analysis of railway bridges. Nevertheless, the moving loads model is not well suited for the study of short bridges (L?2025 m) since the results it produces (displacements and accelerations) are much greater than those obtained from more sophisticated ones. In this paper two factors are analysed which

  6. Short circuit parameters for line faults: Statistical analysis in a high voltage network

    Microsoft Academic Search

    C. Galvao; U. Magagnoli; G. Nicola

    1980-01-01

    The short circuit current and the time constant of the unidirectional current component in line faults occurring in a 388 - 220 KV transmission network and a regional 132 KV subtransmission network were investigated statistically. Distribution and typical parameters are given for single phase to ground, phase to phase, and three phase faults. The knowledge of the effective probability distribution

  7. GRB 060121: Implications of a Short/Intermediate Duration Gamma-Ray Burst at High Redshift

    E-print Network

    A. de Ugarte Postigo; A. J. Castro-Tirado; S. Guziy; J. Gorosabel; G. Johannesson; M. A. Aloy; S. McBreen; D. Q. Lamb; N. Benitez; M. Jelinek; S. B. Pandey; D. Coe; M. D. Perez-Ramirez; F. J. Aceituno; M. Alises; J. A. Acosta-Pulido; G. Gomez; R. Lopez; T. Q. Donaghy; Y. E. Nakagawa; T. Sakamoto; G. R. Ricker; F. R. Hearty; M. Bayliss; G. Gyuk; D. G. York

    2006-05-19

    Since the discovery of the first short-hard gamma-ray burst afterglows in 2005, the handful of observed events have been found to be embedded in nearby (z burst GRB 060121, which is the first observed to clearly outshine its host galaxy (by a factor >10^2). A photometric redshift for this event places the progenitor at a most probable redshift of z = 4.6, with a less probable scenario of z = 1.7. In either case, GRB 060121 could be the farthermost short-duration GRB detected to date and implies an isotropic-equivalent energy release in gamma-rays comparable to that seen in long-duration bursts. We discuss the implications of the released energy on the nature of the progenitor. These results suggest that GRB 060121 may belong to a family of energetic short-duration events, lying at z > 1 and whose optical afterglows would outshine their host galaxies, unlike the first short-duration GRBs observed in 2005. The possibility of GRB 060121 being an intermediate duration burst is also discussed.

  8. Short communication: Protease activity measurement in milk as a diagnostic test for clinical mastitis in dairy cows.

    PubMed

    Koop, G; van Werven, T; Roffel, S; Hogeveen, H; Nazmi, K; Bikker, F J

    2015-07-01

    Due to the increasing use of automated milking systems, automated detection of clinical mastitis is becoming more important. Various in- or on-line diagnostic tests are in use, but generally suffer from false mastitis alerts. In this study, we explored a new diagnostic approach based on measurement of protease activity using fluorogenic protease substrates, which can be performed on site, at high speed, and at low costs. Samples from cows with clinical mastitis submitted for bacteriological culture at the University Farm Animal Practice were collected during several months and kept at -20C until protease activity measurement. A reference set of milk samples from clinically healthy cows were collected on 9 different farms and were tested for protease activity directly and after freezing at -20C to allow for comparison with the samples from clinical cases. The protease activity in mastitic milk samples was significantly higher than in samples from healthy animals. Based on 71 clinical mastitis samples and 180 milk samples from clinically healthy quarters, the area under the receiver-operating characteristic curve was estimated to be between 0.88 and 0.90, and at a threshold of 38 fluorescence per minute the test had a specificity of 0.99 at a sensitivity of 0.58. Protease activity measured in fresh milk from clinically healthy cows was significantly associated with somatic cell count and parity, but not with electrical conductivity, whereas protease activity in milk that had been frozen was statistically significantly associated with all 3 parameters. This study indicates that protease activity measurement as a stand-alone test can be used for detecting mastitis samples, using milk samples that have been frozen. Because protease activity acts in part on a different biological mechanism than somatic cell count or electrical conductivity, this test may increase the accuracy of mastitis diagnosis in combination with currently available in- or on-line tests in automated milking systems. PMID:25981067

  9. The Relative Importance of Selected Communication Skills for Adolescents' Interactions with Their Teachers: High School Teachers' Opinions.

    ERIC Educational Resources Information Center

    Reed, Vicki A.; Spicer, Lynette

    2003-01-01

    High school teachers (n=143) ranked 14 communication skills according to the perceived order of importance for Grade 10 adolescents' communication with them as teachers. Teachers tended to perceive skills associated with discourse management strategies as relatively more important than other skills. Science teachers ranked turn taking higher than

  10. Quality of Communication Life in Adolescents with High-Functioning Autism and Asperger Syndrome: A Feasibility Study

    ERIC Educational Resources Information Center

    Burgess, Sloane; Turkstra, Lyn S.

    2010-01-01

    Purpose: This study was designed to evaluate the feasibility of using the American Speech-Language-Hearing Association's Quality of Communication Life Scale (QCL; Paul et al., 2004) for a group of individuals with developmental communication disorders--adolescents with high-functioning autism/Asperger syndrome (HFA/AS). Perceptions of quality of

  11. Relationship between short-time self-diffusion and high-frequency viscosity in charge-stabilized dispersions

    NASA Astrophysics Data System (ADS)

    Bergenholtz, J.; Horn, F. M.; Richtering, W.; Willenbacher, N.; Wagner, N. J.

    1998-10-01

    Experimental determination of both the short-time self-diffusion coefficient and the high-frequency viscosity are reported for model charge-stabilized dispersions. Despite the charged nature of the particles, we find that both quantities are insensitive to direct interparticle interactions. Quantitative agreement between the experimental data and micromechanical hard sphere theory is observed for a range of particle sizes and added salt content. However, while the reciprocal of the short-time self-diffusion coefficient shows a similar concentration dependence as the high-frequency viscosity, the two do not obey a generalized Stokes-Einstein relation. The violation is due to subtle differences in hydrodynamic interactions between the two particle motions, in agreement with theory and simulation.

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

    SciTech Connect

    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

    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.

  13. Association between short sleeping hours and overweight in adolescents: results from a US Suburban High School survey

    Microsoft Academic Search

    Andreea Seicean; Susan Redline; Sinziana Seicean; H. Lester Kirchner; Yuan Gao; Michikazu Sekine; Xiaobei Zhu; Amy Storfer-Isser

    2007-01-01

    Insufficient sleep may lead to adverse health effects, influencing body weight. This study quantified the prevalence of short\\u000a sleep and the association between sleep duration and overweight in a sample of suburban students. Cross-sectional study was\\u000a conducted in 2004, involving 529 students from Bay High School, Bay Village, OH, USA, using self-administered questionnaires\\u000a assessing lifestyle and sleep behaviors. Students with

  14. Modular High-Temperature Gas-Cooled Reactor short term thermal response to flow and reactivity transients

    Microsoft Academic Search

    J. C. Cleveland

    1988-01-01

    The analyses reported here have been conducted at the Oak Ridge National Laboratory (ORNL) for the US Nuclear Regulatory Commission's (NRC's) Division of Regulatory Applications of the Office of Nuclear Regulatory Research. The short-term thermal response of the Modular High-Temperature Gas-Cooled Reactor (MHTGR) is analyzed for a range of flow and reactivity transients. These include loss of forced circulation (LOFC)

  15. High-Resolution DNA Melt Curve Analysis of the Clustered, Regularly Interspaced Short-Palindromic-Repeat Locus of Campylobacter jejuni

    Microsoft Academic Search

    Erin P. Price; Helen Smith; Flavia Huygens; Philip M. Giffard

    2007-01-01

    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

  16. Improvement of quantum efficiency at short wavelengths in a high-low junction emitter silicon solar cells made by diffusion

    Microsoft Academic Search

    Feng Sheng Zhang; Shu Chun Hu; Xuan Huang; Xian Gang Zhu; Shen Jun Zhang

    1985-01-01

    A new simple diffusion process was developed to form a high-low junction emitter silicon p(+)\\/p\\/n solar cell for improved quantum efficiency at short wavelengths. This solar cell offers a significantly improved UV and blue efficiency in comparison with conventional silicon solar cells. Experimental results show that the new cell offers an internal quantum efficiency of more than 80 percent at

  17. Characterization and genetic mapping of a short, highly repeated, interspersed DNA sequence from rice ( Oryza sativa L.)

    Microsoft Academic Search

    Xinping Zhao; Gary Kochert

    1992-01-01

    A short, highly repeated, interspersed DNA sequence from rice was characterized using a combination of techniques and genetically mapped to rice chromosomes by restriction fragment length polymorphism (RFLP) analysis. A consensus sequence (GGC)n, where n varies from 1316, for the repeated sequence family was deduced from sequence analysis. Southern blot analysis, restriction mapping of repeat element-containing genomic clones, and DNA

  18. Imaging sensitivity of three kind of high-sensitivity imaging cameras under short-pulsed light illumination

    Microsoft Academic Search

    Hideyuki TAKAHASHI; Kouichi SAWADA; Koki ABE; Yoshimi TAKAO; Kazutoshi WATANABE

    *** Abstract: As a part of a development of an optical system that enables us to precisely observe negative phototactic fish in situ, characteristics of three different types of a high-sensitivity camera were investigated under short-pulsed light illuminations of different colors. These three types of a camera were Image Intensifier connected with CCD camera, EB-CCD camera, and HARP camera and

  19. Improved Physical Performance in Older Adults Undertaking a Short-Term Programme of High-Velocity Resistance Training

    Microsoft Academic Search

    Tim R. Henwood; Dennis R. Taaffe

    2005-01-01

    Background: The age-related loss of muscle power in older adults is greater than that of muscle strength and is associated with a decline in physical performance. Objective: To investigate the effects of a short-term high-velocity varied resistance training programme on physical performance in healthy community-dwelling adults aged 6080 years. Methods: Subjects undertook exercise (EX; n = 15) or maintained customary

  20. Vegetation response to a short interval between high-severity wildfires in a mixed-evergreen forest

    Microsoft Academic Search

    Daniel C. Donato; Joseph B. Fontaine; W. Douglas Robinson; J. Boone Kauffman; Beverly E. Law

    2009-01-01

    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