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线性EDGE功率放大器在手机上的应用

电子与电脑 2006年第11期6卷 40-48页

作者： ethan Lee RFMD

在GSM系统,EDGE可说是进一步增加数据传输速率.通过调变方式的改变、编码以及多传输时槽进而达到3倍的传输速率.

关键词： EDGE标准手机市场功率放大器数据传输速率 Strategy 应用线性 EDGE功能

用文化打造企业竞争力——广州飞肯摩托有限公司企业文化印象

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摩托车信息 2013年第12期 124-125页

作者： ethan

有这么一家公司，在短短的5年里，用专业、专注赢得了市场，得到了广大供应商、经销商、社会各界以及全体员工的一致好评与信赖。它就是广州飞肯摩托有限公司。

关键词：企业文化企业竞争力摩托广州印象供应商经销商

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Journal of Science in Sport and Exercise 2020年第2期2卷 173-182页

作者： Joshua L.Keller Terry J.Housh ethan C.Hill Cory M.Smith Richard J.Schmidt Glen O.Johnson Human Performance Laboratory Department of Nutrition and Health SciencesCollege of Education and Human SciencesUniversity of Nebraska-LincolnLincolnNE 68508USA Division of Kinesiology School of Kinesiology and Physical TherapyUniversity of Central FloridaOrlandoFL 32816USA Department of Kinesiology College of Health SciencesUniversity of Texas at El PasoEl PasoTX 79968USA

The purpose of this investigation was to use the RPE clamp protocol to examine sex-related differences in performance fati-gability and neuromuscular responses as the result of a sustained isometric leg extension muscle action anchored to RPE=*** adults(10 men,10 women)performed sustained muscle actions at RPE=2 for *** voluntary isometric contractions(MVIC)were performed prior to and following the sustained muscle ***(electromyographic and mechanomyographic)parameters and force were recorded,and the values were normalized to respective MVICs and cal-culated every 5%across the 5-min work *** artery blood flow(FABF)was assessed at pretest,immediately posttest,and 5-min *** regression was used to define the individual and composite normalized neuromuscular and force versus time relationships during the sustained muscle *** factorial ANOVAs were used to examine differences in performance fatigability and blood *** performance fatigability,the men(62.4±14.4 kg-43.1±11.5 kg)exhibited a significantly(P<0.05)greater decrease pretest to posttest in MVIC than the women(44.1±4.8 kg vs.38.1±6.1 kg).There were different fatigue-induced neuromuscular patterns of responses between the men and women across *** blood flow responses,however,there was no sex-related difference,but pretest(283.3±70.8 mL/min)was significantly(P<0.05)less than immediately posttest(424.5±133.5 mL/min)and 5-min posttest(324.4±78.3 mL/min).Thus,men demonstrated a greater degree of performance fatigability than the women,which was independent of differences in *** such as the neuromuscular system and muscle morphology likely contributed to the difference in performance fatigability.

关键词： Perception Resistance training Electromyography Fatigue Mechanomyography RPE clamp

MCSE制胜宝典 Windows 2000 Server

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丛书名： MCSE制胜宝典

2000年

作者：（美）Bob Sheldon （美）ethan Wilansky 潇湘工作室译

微软指定MCSE教材:本书介绍了Windows 2000 Server的安装和配置、使用文件系统管理共享系统和访问、管理Windows 2000磁盘和数据存储等。

ISBN: (数字)7900625755

ISBN: (纸本)7900625755

微软指定MCSE教材:本书介绍了Windows 2000 Server的安装和配置、使用文件系统管理共享系统和访问、管理Windows 2000磁盘和数据存储等。

关键词：窗口软件网络服务器

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欠膨胀氢气射流激波结构数值模拟研究

工程热物理学报 2018年第4期39卷 880-886页

作者：李雪芳王俞杰罗峰 ethan S Hecht 柯道友山东大学热科学与工程研究中心济南250061 清华大学热科学与动力工程教育部重点实验室北京100084 Combustion Research Facility Sandia National Laboratories

本文利用数值模拟的方法研究了高压氢气泄漏所产生的欠膨胀氢气射流的激波结构。采用二维轴对称几何模型,分别模拟了不同压力比下,出口直径为1 mm的氢气射流。模拟得到了不同压力比下激波结构的形态和特征尺寸,包括马赫盘的位置、直径... 详细信息

本文利用数值模拟的方法研究了高压氢气泄漏所产生的欠膨胀氢气射流的激波结构。采用二维轴对称几何模型,分别模拟了不同压力比下,出口直径为1 mm的氢气射流。模拟得到了不同压力比下激波结构的形态和特征尺寸,包括马赫盘的位置、直径和边界层的厚度等。通过计算结果与实验测量的比较表明,当泄漏源压力小于3 MPa时,数值模拟不能够得到实验中观测到的典型激波结构;而当泄漏源压力达到3 MPa及以上时,数值模拟就可以成功地计算欠膨胀射流的激波结构.此外,模拟还得到了沿射流中心线的气流马赫数、压力和温度等一系列气流参数。

关键词：氢气泄漏欠膨胀射流激波结构数值模拟纹影法

Meta-Learning of Evolutionary Strategy for Stock Trading

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Journal of Data Analysis and Information Processing 2020年第2期8卷 86-98页

作者： Erik Sorensen Ryan Ozzello Rachael Rogan ethan Baker Nate Parks Wei Hu Department of Computer Science Houghton College Houghton NY USA

Meta-learning algorithms learn about the learning process itself so it can speed up subsequent similar learning tasks with fewer data and iterations. If achieved, these benefits expand the flexibility of traditional machine learning to areas where there are small windows of time or data available. One such area is stock trading, where the relevance of data decreases as time passes, requiring fast results on fewer data points to respond to fast-changing market trends. We, to the best of our knowledge, are the first to apply meta-learning algorithms to an evolutionary strategy for stock trading to decrease learning time by using fewer iterations and to achieve higher trading profits with fewer data points. We found that our meta-learning approach to stock trading earns profits similar to a purely evolutionary algorithm. However, it only requires 50 iterations during test, versus thousands that are typically required without meta-learning, or 50% of the training data during test.

关键词： Meta-Learning MAML Reptile Machine Learning Natural Evolutionary Strategy Stock Trading

Water Absorption and Degraded Stress Relaxation Behavior in Water-Borne Anticorrosive Urethane/Epoxy Coatings

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Journal of Chemistry and Chemical Engineering 2015年第2期9卷 75-89页

作者： Yukitoshi Takeshita ethan Becker Seizo Sakata Takuya Kamisho Takashi Miwa Takashi Sawada NTT Energy and Environment Systems Laboratories Nippon Telegraph and Telephone Corporation Tokyo 180-8585 Japan Chemistry and Engineering Physics University of Wiseonsin-Platteville W15 3818 USA

The kinetics of water absorption in water-borne anticorrosive urethane/epoxy coatings, which were actually introduced in the industrial field, are studied. It is found that the high water affinity of a water-borne coating supports a higher saturated water content, Mχ, and helps to facilitate absorption D. The three parameters of stretched exponential function called the William-Watt equation, Eo, τ, and β, are determined to fit the degraded stress relaxation behavior in the water absorption process because this function quantitatively describes the relaxing ability and has been successfully used by a number of researchers. An increasing in the water content is shown to correlate strongly with a decrease in Eo and fl early in the absorption process between Mt/M（χ） = 0 and Mt/Mχ≈ 0.5. The adhesive characteristics of the coatings are correlated with water content, and shown to exhibit higher cohesive failure in coating epoxies under saturated conditions. This suggests that water interferes with the intermolecular bonding between polymer chains which degrades the bulk materials ability to diffuse stress concentrations and reduces its overall strength.

关键词： Water absorption stress relaxation behavior water-borne coating urethane epoxy maxwell model.

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Java Outside In

Induction of Wnt signaling antagonists and p21-activated kinase enhances cardiomyocyte proliferation during zebrafish heart regeneration

2003年

作者： ethan D Bolker W Campbell Bill Campbell

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Journal of Molecular Cell Biology 2021年第1期13卷 41-58页

作者： Xiangwen Peng Kaa Seng Lai Peilu She Junsu Kang Tingting Wang Guobao Li Yating Zhou jianjian Sun Daqing Jin Xiaolei Xu Lujian Liao Jiandong Liu ethan Lee Kenneth D.Poss Tao P.Zhong State Key Laboratory of Genetic Engineering School of Life SciencesZhong Shan HospitalFudan UniversityShanghai 200438China Shanghai Key Laboratory of Regulatory Biology Institute of Molecular MedicineEast China Normal University School of Life SciencesShanghai 200241China Department of Cell Biology Duke University Medical CenterDurhamNC 27710USA Department of Biochemistry and Molecular Biology Mayo ClinicRochesterMN 55905USA Department of Pathology and Laboratory Medicine McAllister Heart InstituteUniversity of North Carolina at Chapel HillChapel HillNC 27599USA Department of Developmental and Cell Biology Vanderbilt University School of MedicineNashvilleTN 37232USA T These authors share first authorship.

Heart regeneration occurs by dedifferentiation and proliferation of pre-existing cardiomyocytes(CMs).However,the signaling mechanisms by which injury induces CM renewal remain incompletely ***,we find that cardiac injury in zebrafish induces expression of the secreted Wnt inhibitors,including Dickkopf 1(Dkkl),Dkk3,secreted Frizzled-related protein 1(sFrpl),and sFrp2,in cardiac tissue adjacent to injury *** blocking of Wnt activity via Dkkl overexpression enhances CM proliferation and heart regeneration,whereas ectopic activation of Wnt8 signaling blunts injury-induced CM dedifferentiation and *** Wnt signaling is dampened upon injury,the cytoplasmic β-catenin is unexpectedly increased at disarrayed CM sarcomeres in myocardial wound *** analyses indicated that p21-activated kinase 2(Pak2)is induced at regenerating CMs,where it phosphorylates cytoplasmic β-catenin at Ser 675 and increases its stability at disassembled ***-specific induction of the phospho-mimeticβ-catenin(S675E)enhances CM dedifferentiation and sarcomere disassembly in response to ***,inactivation of Pak2 kinase activity reduces the Ser 675-phosphorylatedβ-catenin(pS675-β-catenin)and attenuates CM sarcomere disorganization and dedifferentiation・Taken together,these findings demonstrate that coordination of Wnt signaling inhibition and Pak2/pS675-βYatenin signaling enhances zebrafish heart regeneration by supporting CM dedifferentiation and proliferation.

关键词： heart regeneration Wnt signaling PAK2 kinase cardiomyocyte proliferation cardiomyocyte dedifferentiation zebrafish