gebhart/patrepeval huggingface dataset:
New insight into subharmonic oscillation mode of GaAs power amplifiers under severe output mismatch condition (2002)

This paper provides new insight into the cause of subharmonic generation in GaAs MESFET power amplifiers under severe output mismatch conditions. A nonlinear modeling methodology is developed to identify the root cause of subharmonic oscillations and provides a means to implement circuit techniques to suppress this mode of oscillation without degrading the desired power amplifier performance. This modeling based technique is enabled through the use of a time domain MESFET model which achieves excellent convergence by avoiding the discontinuity in high-order derivatives that is typical of implementations that use conditional functions. This technique allows the design engineer for the first time the ability to determine apriori the large signal stability of a power amplifier operating into a severe mismatch and implement circuit solutions prior to MMIC fabrication.
Bone Marrow-Derived Mesenchymal Stem Cells Influence Early Tendon-Healing in a Rabbit Achilles Tendon Model (2007)

Intratendinous cell therapy with bone marrow-derived mesenchymal stem cells following primary tendon repair can improve histological and biomechanical parameters in the early stages of tendon-healing.
A Practical Molybdenum-Catalyzed Oxidation of Alcohols by Sodium Percarbonate (1996)

The oxidation of alcohols by sodium percarbonate has been carried out at reflux of acetonitrile or 1,2-dichloroethane in the presence of catalytic amounts of both molybdenyl acetylacetonate and Adogen 464. Fair to high yields of the corresponding carbonyl compounds have been obtained from various primary and secondary alcohols.
Islet Isolation and Cryopreservation in Rats and Dogs (1990)

Wenn Methoden zur Isolation menschlicher Inseln immer mehr verbessert und klinische Versuche häufiger werden, wird irgendeine Art der Lagerung benötigt werden. Kryo-Konservierung würde viele Vorteile bieten: Lagerung in einer Gewebe-Bank, welche gewährleisten würde, daß genügend Inseln zur Transplantation für den einzelnen Empfänger zur Verfügung stehen, Immunmodulation des Gewebes, Anreicherung und Erleichterung des Versandes von Zentrum zu Zentrum. Seit 1976 hat man viele Erfahrungen auf dem Gebiet der Insel Kryo- Konservierung gemacht, mit Gefrierraten von 0.25°C/min bis 75°C/min, die jeweils als optimal beschrieben wurden. Wir stellten fest, daß bei Ratten langsames Einfrieren auf — 40°C und schnelles Auftauen von — 196 °C die höchstmöglichen Überlebenschancen von Inseln gewährleistet, wie bei in-vivo und in- vitro Versuchen festzustellen war. Mit diesem Einfrier-Auftauprotokoll können ebenfalls lebensfähige pankreatische Mikrofragmente und reine Hundeinseln aufbewahrt werden. Mit beiden Präparationen kann nach Transplantation eine verlängerte Normoglykämie erreicht werden. Dieses Einfrierverfahren ergibt für Xeno-Transplantate verlängerte Überlebenschancen und reinigt die pankreatischen Mikrofragmente von ungewollten exokrinen Kontaminationen. Diese Erkenntnisse werden nun für menschliche Inseln genutzt. Niedrig-Temperatur-Lagerung von menschlichen Inseln wird in hohem Maß der klinischen Anwendung von Inseltransplantationen dienen.
Studies of vibrating atomic force microscope cantilevers in liquid (1996)

An atomic force microscope (AFM) design providing a focused spot of order 7 μm in diameter was used to analyze the motion of vibrating cantilevers in liquid. Picking an operating frequency for tapping mode AFM operation in liquid is complex because there is typically a large number of sharp peaks in the response spectrum of cantilever slope amplitude versus drive frequency. The response spectrum was found to be a product of the cantilever’s broad thermal noise spectrum and an underlying fluid drive spectrum containing the sharp peaks. The geometrical shape of transverse cantilever motion was qualitatively independent of the fluid drive spectrum and could be approximately reproduced by a simple theoretical model. The measurements performed give new insights into the behavior of cantilevers during tapping mode AFM operation in liquid.
Direct Measurement of Eustachian Tube Compliance (1996)

We developed a method by which tubal compliance can be directly measured, and using this method we examined tubal compliance in 18 adults with a disease-free ear and 8 adults with chronic otitis media. This method is advantageous in that one can directly measure tubal compliance in the cartilaginous part of the eustachian tube. It is our view that each eustachian tube has its own compliance which is not influenced by mucosal swelling or muscle tension around the tube.
Impact of Adjacent Channel Interference on the Capacity of WCDMA/FDD Networks (2004)

Adjacent channel interference (ACI) can result in a reduced network capacity in a multioperator WCDMA/FDD environment. This paper is devoted to the study of the ACI by using a static simulator. Simulations were performed in order to identify particular scenarios and network compositions where ACI plays a major role in the system capacity. On the basis of the results, the authors identify the best strategy for frequency deployment, within the available spectrum, is identified. It is demonstrated that the macro carrier should be located in the centre of the frequency band, protected from the ACI introduced by other operators. It is, in fact, the carrier which suffers the greatest losses due to the increase in ACI. Furthermore, the micro carrier should be placed as close as possible to the adjacent channel of other operators in order to maximize system capacity.
Confocal Scanning Transmission Electron Microscopy: Theoretical Analysis of Three-Dimensional Imaging (2005)

Extract HTML view is not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button. Extended abstract of a paper presented at Microscopy and Microanalysis 2005 in Honolulu, Hawaii, USA, July 31--August 4, 2005
Characterization of a chitinase gene (<i>chiA</i>) from<i>Serratia marcescens</i>BJL200 and one-step purification of the gene product (1994)

The nucleotide sequence of the chiA gene from Serratia marcescens strain BJL200 was determined. The gene was found to encode a protein of 563 amino acid residues, with a typical N-terminal signal peptide of 23 residues, that is cleaved off during export. The gene exhibited striking differences with two previously characterized chiA genes of S. marcescens in the region corresponding to amino acid residues 410-467 of the gene product. Periplasmic fractions of an Escherichia coli strain harbouring the cloned gene were used as starting material for the development of a fast, one-step purification protocol for the chitinase that is based on hydrophobic interaction chromatography.
Communication adaptability and interaction involvement as predictors of cross‐cultural adjustment (1992)

This study examined the effects of communication adaptability and interaction involvement on one aspect of cross‐cultural adjustment: culture shock. Culture shock refers to stressful feelings caused by social difficulties sojourners experience in the host culture. Results indicate that significant and positive relationships exist among communication adaptability, interaction involvement, and the sojourners’ ability to cope with social difficulties caused by the host culture. Further testing was conducted to investigate which of the components of communication adaptability and interaction involvement best predicts the dimensions of social difficulties. Implications and directions for future research were also discussed.
<scp>l</scp> -Malyl-Coenzyme A/β-Methylmalyl-Coenzyme A Lyase Is Involved in Acetate Assimilation of the Isocitrate Lyase-Negative Bacterium <i>Rhodobacter capsulatus</i> (2005)

Cell extracts of Rhodobacter capsulatus grown on acetate contained an apparent malate synthase activity but lacked isocitrate lyase activity. Therefore, R. capsulatus cannot use the glyoxylate cycle for acetate assimilation, and a different pathway must exist. It is shown that the apparent malate synthase activity is due to the combination of a malyl-coenzyme A (CoA) lyase and a malyl-CoA-hydrolyzing enzyme. Malyl-CoA lyase activity was 20-fold up-regulated in acetate-grown cells versus glucose-grown cells. Malyl-CoA lyase was purified 250-fold with a recovery of 6%. The enzyme catalyzed not only the reversible condensation of glyoxylate and acetyl-CoA to L-malyl-CoA but also the reversible condensation of glyoxylate and propionyl-CoA to beta-methylmalyl-CoA. Enzyme activity was stimulated by divalent ions with preference for Mn(2+) and was inhibited by EDTA. The N-terminal amino acid sequence was determined, and a corresponding gene coding for a 34.2-kDa protein was identified and designated mcl1. The native molecular mass of the purified protein was 195 +/- 20 kDa, indicating a homohexameric composition. A homologous mcl1 gene was found in the genomes of the isocitrate lyase-negative bacteria Rhodobacter sphaeroides and Rhodospirillum rubrum in similar genomic environments. For Streptomyces coelicolor and Methylobacterium extorquens, mcl1 homologs are located within gene clusters implicated in acetate metabolism. We therefore propose that L-malyl-CoA/beta-methylmalyl-CoA lyase encoded by mcl1 is involved in acetate assimilation by R. capsulatus and possibly other glyoxylate cycle-negative bacteria.
A Stochastic Push Scheme of Streaming Media Partial Content based on P2P (2012)

In streaming media CDN, pushing copies of the new content to caching proxies ahead of time while allowing others to be pulled from the origin server is an effective way to reduce the client startup time and save network resource. In order to cope with the shortcomings of the existing streaming media CDN and accomplish large-scale deployment streaming media on the Internet, in this paper, first, we put forward a framework of streaming media CDN based on P2P. Second, streaming media content delivery strategies have been studied, according to the access feature of different part of streaming media file, we present a stochastic push scheme based on the access characteristics of streaming media and put forward a stochastic algorithm of destination selection using the history access information of the origin server recorded. The experiments indicate that the scheme and the algorithm are effective.
STIMULATION BY LUTEINIZING HORMONE OF ORNITHINE DECARBOXYLASE IN RAT OVARY: PREFERENTIAL RESPONSE BY FOLLICULAR TISSUE (1974)

Department of Biodynamics, Weizmann Institute of Science, Rehovot, Israel (Received 4 June 1974) Luteinizing hormone (LH) stimulates ovarian ornithine decarboxylase (ODC), the first enzyme in the pathway of polyamine synthesis, when injected into mature (Kobayashi, Kupelian & Maudsley, 1971; Jänne & Williams-Ashman, 1971) or immature rats (Kaye, Icekson, Lamprecht, Gruss, Tsafriri & Lindner, 1973). Kobayashi et al. (1971) observed a rise in ovarian ODC activity on the afternoon of prooestrus, which may be related to the ovulatory process (Kobayashi et al. 1971) and/ or the early stages of corpus luteum formation (Williams-Ashman, Jänne, Coppoc, Geroch & Schenone, 1972). We show here that ovarian ODC activity is stimulated by LH preferentially in the Graafian follicle. Groups of three to five Wistar-derived female rats (approximately 100 days old) selected after at least two successive regular 4-day oestrous cycles, were used for surgical isolation of Graafian follicles and corpora lutea. Only corpora lutea
High frequency permeability measurements on Ni/sub 76/Fe/sub 10/Co/sub 14//Cu giant magnetoresistive multilayers (1994)

High frequency permeability was measured on a [Ni/sub 76/Fe/sub 10/Co/sub 14/(16 /spl Aring/)/Cu(23 /spl Aring/)]/sub 10/ giant magnetoresistive multilayer. The real part of the permeability was essentially flat at least up to 100 MHz with a value of 360. The intrinsic anisotropy field, and the bilinear and the biquadratic exchange fields were determined from measurements of the transverse biased permeability along both the easy and hard axes.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
The impact of sound speed errors on medical ultrasound imaging (2000)

The results of a quantitative study of the impact of sound speed errors on the spatial resolution and amplitude sensitivity of a commercial medical ultrasound scanner are presented in the context of their clinical significance. The beamforming parameters of the scanner were manipulated to produce sound speed errors ranging over +/-8% while imaging a wire target and an attenuating, speckle-generating phantom. For the wire target, these errors produced increases in lateral beam width of up to 320% and reductions in peak echo amplitude of up to 10.5 dB. In the speckle-generating phantom, these errors produced increases in speckle intensity correlation cell area of up to 92% and reductions in mean speckle brightness of up to 5.6 dB. These results are applied in statistical analyses of two detection tasks of clinical relevance. The first is of low contrast lesion detectability, predicting the changes in the correct decision probability as a function of lesion size, contrast, and sound speed error. The second is of point target detectability, predicting the changes in the correct decision probability as function of point target reflectivity and sound speed error. Representative results of these analyses are presented and their implications for clinical imaging are discussed. In general, sound speed errors have a more significant impact on point target detectability over lesion detectability by these analyses, producing up to a 22% reduction in correct decisions for a typical error.
A Risk Assessment Model for Voting Systems using Threat Trees and Monte Carlo Simulation (2009)

There continues to be a requirement for better models, tools, and techniques for conducting risk assessment of voting systems. We propose a model of risk and a technique for risk assessment, which builds on threat trees and Monte Carlo simulation. The goal is to provide a means of facilitating informed decisions regarding voting system security standards through a rational and parsimonious quantification of intuition or estimation of risk. Such a means should support an evaluation of trade-offs, sensitivity analysis, cost-benefit analysis, and estimation of residual risk of current and proposed voting systems, technologies and controls.
DLX-1, DLX-2, and DLX-5 expression define distinct stages of basal forebrain differentiation (1999)

The homeobox genes in the Dlx family are required for differentiation of basal forebrain neurons and craniofacial morphogenesis. Herein, we studied the expression of Dlx-1, Dlx-2, and Dlx-5 RNA and protein in the mouse forebrain from embryonic day 10.5 (E10.5) to E12.5. We provide evidence that Dlx-2 is expressed before Dlx-1, which is expressed before Dlx-5. We also demonstrate that these genes are expressed in the same cells, which may explain why single mutants of the Dlx genes have mild phenotypes. The DLX proteins are localized primarily to the nucleus, although DLX-5 also can be found in the cytoplasm. During development, the fraction of Dlx-positive cells increases in the ventricular zone. Analysis of the distribution of DLX-1 and DLX-2 in M-phase cells suggests that these proteins are distributed symmetrically to daughter cells during mitosis. We propose that DLX-negative cells in the ventricular zone are specified progressively to become DLX-2-expressing cells during neurogenesis; as these cells differentiate, they go on to express DLX-1, DLX-5, and DLX-6. This process appears to be largely the same in all regions of the forebrain that express the Dlx genes. In the basal telencephalon, these DLX-positive cells differentiate into projection neurons of the striatum and pallidum as well as interneurons, some of which migrate to the cerebral cortex and the olfactory bulb.
Multicore MILS [microprocessor design] (2014)

Recent improvements in the performance and security architecture of modern microprocessor designs have made the implementation of the Multiple Independent Levels of Security (MILS) software architecture technically feasible and at affordable cost. Reaching this inflexion point has enabled the development of MILS systems on single-core processor architectures comprising applications and data of multiple security classifications hosted concurrently on the same platform. In this paper, the potential requirements for the implementation of a separation kernel to support MILS systems on multicore processor architectures will be considered, and the design challenges associated with its potential implementation on the Freescale QorIQTM P4080 multicore processor will be discussed. Finally, the potential use of a MILS Multicore separation kernel in two use cases will be presented - a Cross-Domain System (CDS) network gateway, and a Multi-Level Secure (MLS) Integrated Modular Avionics (IMA) platform.
FIRST STEPS TOWARD A VERIFICATION AND VALIDATION ONTOLOGY (2010)

This paper presents the key elements of an ontology that formalizes part of the knowledge about behavioural modeling and the associated verification and validation technologies. It summarizes the concepts existing in this area of interest and the relationships among them. We propose a classification of different modeling formalisms and a representation of possible verification and validation methods. A system is represented using several views conforming to different modeling languages. Its properties can be assessed with verification and validation technologies. We also describe existing V&V tools and how they are related to the other elements.
Predominant Mode of Human Immunodeficiency Virus Transfer between T Cells Is Mediated by Sustained Env-Dependent Neutralization-Resistant Virological Synapses (2007)

Cell-free human immunodeficiency virus type 1 (HIV-1) can initiate infections, but contact between infected and uninfected T cells can enhance viral spread through intercellular structures called virological synapses (VS). The relative contribution of VS to cell-free viral transfer has not been carefully measured. Using an ultrasensitive, fluorescent virus transfer assay, we estimate that when VS between HIV-expressing Jurkat T cells and primary CD4(+) T cells are formed, cell-associated transfer of virus is 18,000-fold more efficient than uptake of cell-free virus. Furthermore, in contrast to cell-free virus uptake, the VS deposits virus rapidly into focal, trypsin-resistant compartments in target T cells. This massive virus internalization requires Env-CD4 receptor interactions but is resistant to inhibition by patient-derived neutralizing antisera that inhibit homologous cell-free virus. Deleting the Env cytoplasmic tail does not abrogate VS-mediated transfer, but it renders the VS sensitive to neutralizing antibodies, suggesting that the tail limits exposure of VS-neutralizing epitopes on the surface of infected cells. Dynamic live imaging of the VS reveals that HIV-expressing cells are polarized and make sustained, Env-dependent contacts with target cells through uropod-like structures. The polarized T-cell morphology, Env-CD4 coordinated adhesion, and viral transfer from HIV-infected to uninfected cells suggest that VS allows HIV-1 to evade antibody neutralization and to disseminate efficiently. Future studies will discern to what extent this massive viral transfer contributes to productive infection or viral dissemination through the migration of virus-carrying T cells.
Lateral Order Distribution of Cellulose and its Levelling-off Degree of Polymerization etc (1958)

アルカリ溶解量より求めたいわゆるラテラルオーダー(以後, ラテラルオーダーをL.O.と略す) 分布と重合度因子と の関係を検討するためラミー, ブナパルプを予備加水分解し平衡重合度になったものの重合度, 重合度分布曲線, 不均一度,回折X線図等を測定し比較検討した。この結果,ラミーの平衡重合度,不均一度等はブナよりも少なく,重合度分布曲線の大部分はブナと重複することを認めた。また回折X線図より求めた結晶化度はラミーの方が大であった。一方,溶解量より求めたL.O.分布ではラミーの方がブナよりもL.O.の高い領域に分布の山があった。以上の結果から, 溶解性に及ぼす重合度の影響は重要と考えられるが,本実験によれば重合度は比較的に2次的な因子と考えられ,1次的な因子は予期のごとく本質的な結晶性であると推定される。なお,べンベルグ,普通レーヨンについても同様な考察を試みた。また,タイヤコード用レーヨンの予備加水分解前後の重合度分布を測定し不均一度等を比較した。
A Quantitative In Vitro Assay for Chemical Mosquito-Deterrent Activity without Human Blood Cells<sup>1</sup> (2008)

We report that an aqueous solution containing 10(-3) M adenosine triphosphate (ATP) and citrate-phosphate-dextrose-adenine (CPDA-1) can effectively replace transfusable human red blood cells in an in vitro Klun and Debboun bioassay system for evaluating chemicals for mosquito feeding-deterrent activity, using either Aedes aegypti or Anopheles stephensi. These species fed with similar avidity through collagen membrane covering aqueous 10(-3) M ATP plus CPDA-1 or red blood cells in CPDA-1 supplemented with ATP. In a 2nd experiment, we evaluated the feeding-deterrent activity of N,N-diethyl-3-methylbenzamide and a newly discovered natural product chemical, (-)-isolongifolenone, against these 2 mosquito species. We found that the feeding-deterrent efficacy of the 2 chemicals was similar whether the feeding stimulant was red blood cells supplemented with ATP or ATP alone with CPDA-1. Since the use of human red blood cells in bioassays raises important health and logistic issues, aqueous ATP with CPDA-1 is a reasonable alternative to human blood cells for routine in vitro chemical screening.
Rapid imaging of hyperpolarized gas using EPI (1999)

Rapid repetitive MRI of hyperpolarized (HP) gases using echo-planar imaging (EPI) has been theoretically investigated and experimentally demonstrated for (3)He in human lung. A quantitative treatment of signal attenuation and magnetization consumption for the unique circumstance of a rapidly diffusing nonrenewable magnetization source has been performed. Rapid (compared to the human respiratory cycle) and repetitive imaging of the lung gas space with EPI and a single delivered bolus of HP-(3)He is feasible using low flip angles, provided the voxels are not too small. A coarse-grid (32 x 64) EPI pulse sequence has been developed and implemented to image the lungs of healthy volunteers during rebreathing of a HP-(3)He/N(2) gas mixture. A set of three 10-mm axial slices was imaged every 0.12 sec for the 36 sec duration of rebreathing, yielding a real-time visualization of ventilation. Despite some mild artifacts, the images are of good quality and show changes in gas density related to respiratory physiology. Magn Reson Med 42:507-514, 1999.
Possible practical use of self-switching of radiation in coupled waveguides for amplification of the useful modulation of a signal (1987)

An analysis is made of the difficulties encountered in the construction of optical transistors based on self-switching of radiation in tunnel-coupled optical waveguides. A method is suggested which avoids a number of physical difficulties. An estimate is obtained of the influence of various negative factors such as losses in the coupled waveguides, imperfections of these waveguides, and secondary nonlinear effects (stimulated Brillouin and Raman scattering, breakdown, etc.).
Growth Position and Chirality Control of Single-Walled Carbon Nanotubes (2011)

We propose a novel technique to grow the single-walled carbon nanotubes (SWNTs) with specific chirality at the desired position using free electron laser (FEL) irradiation during growth and surface treatment. As a result, only the semiconducting SWNTs grew at the area between triangle electrodes, where the ozone treatment was done to be hydrophilic when an alcohol chemical vapor deposition (ACCVD) process was carried out with the 800nm FEL irradiation. Although the number of possible chiral index is 22 in the SWNTs grown without the FEL irradiation, the number is much reduced to be 8 by the FEL.
FOREWORD (1992)

FOREWORD Get access Paul Slack, Paul Slack Search for other works by this author on: Oxford Academic Google Scholar Joanna Innes Joanna Innes Search for other works by this author on: Oxford Academic Google Scholar Past & Present, Volume 137, Issue 1, November 1992, Pages 3–7, https://doi.org/10.1093/past/137.1.3 Published: 01 November 1992