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1841篇 您的检索式:作者名="HECHTS"
    题名 作者 年代 出处 被引量
1肾脏病变:对比扩散加权成像与对比增强MRI的病变特征显示文摘目的以MRI随访检查和组织病理学分析结果作为参照标准,比较扩散加权MRI与对比增强MRI对肾脏病变的诊断效能,并评价两者结合的诊断效能。方法机构审查委员会批准本项研究,不需病人知情同意,因其为符合HIPAA标准的回顾性研究。应用对比增强MRI和不同b值下屏气DWI评价64例病人(男46例,女18例,平均年龄60.7岁)的109个肾脏病灶。采用对比增强MRI判断标准评估肾脏病变特征,测量表观扩散系数(ADC)值。B. Taouli R.K. Thakur L. Mannelli J.S. Babb S. Kim E.M. Hecht 龙淼淼(译) 季倩(校) 2009国际医学放射学杂志2009,32,4:32
2有轨电车和轻轨车辆的防碰撞性显示文摘为提高有轨电车和轻轨车辆的防碰撞性,研制了防碰撞的车体结构,并进行了试验验证。Markus Hecht 祝华 2005国外铁道车辆2005,42,5:10
3欠膨胀氢气射流激波结构数值模拟研究显示文摘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。李雪芳 王俞杰 罗峰 Ethan S Hecht 柯道友 2018工程热物理学报2018,39,4:8
4Rotary-scaling fine-tuning (RSFT) method for optimizing railway wheel profiles and its application to a locomotive显示文摘The existing multi-objective wheel profile optimization methods mainly consist of three sub-modules:(1)wheel profile generation,(2)multi-body dynamics simulation,and(3)an optimization algorithm.For the first module,a comparably conservative rotary-scaling finetuning(RSFT)method,which introduces two design variables and an empirical formula,is proposed to fine-tune the traditional wheel profiles for improving their engineering applicability.For the second module,for the TRAXX locomotives serving on the Blankenburg–Rubeland line,an optimization function representing the relationship between the wheel profile and the wheel–rail wear number is established based on Kriging surrogate model(KSM).For the third module,a method combining the regression capability of KSM with the iterative computing power of particle swarm optimization(PSO)is proposed to quickly and reliably implement the task of optimizing wheel profiles.Finally,with the RSFT–KSM–PSO method,we propose two wear-resistant wheel profiles for the TRAXX locomotives serving on the Blankenburg–Rubeland line,namely S1002-S and S1002-M.The S1002-S profile minimizes the total wear number by 30%,while the S1002-M profile makes the wear distribution more uniform through a proper sacrifice of the tread wear number,and the total wear number is reduced by 21%.The quasi-static and hunting stability tests further demonstrate that the profile designed by the RSFT–KSM–PSO method is promising for practical engineering applications.Yunguang Ye Yayun Qi Dachuan Shi Yu Sun Yichang Zhou Markus Hecht 2020Railway Engineering Science2020,28,2:6
5Railway wheel profile fine-tuning system for profile recommendation显示文摘This paper develops a wheel profile fine-tuning system(WPFTS)that comprehensively considers the influence of wheel profile on wheel damage,vehicle stability,vehicle safety,and passenger comfort.WPFTS can recommend one or more optimized wheel profiles according to train operators’needs,e.g.,reducing wheel wear,mitigating the development of wheel out-of-roundness(OOR),improving the shape stability of the wheel profile.Specifically,WPFTS includes four modules:(I)a wheel profile generation module based on the rotary-scaling finetuning(RSFT)method;(II)a multi-objective generation module consisting of a rigid multi-body dynamics simulation(MBS)model,an analytical model,and a rigid–flexible MBS model,for generating 11 objectives related to wheel damage,vehicle stability,vehicle safety,and passenger comfort;(III)a weight assignment module consisting of an adaptive weight assignment strategy and a manual weight assignment strategy;and(IV)an optimization module based on radial basis function(RBF)and particle swarm optimization(PSO).Finally,three cases are introduced to show how WPTFS recommends a wheel profile according to train operators’needs.Among them,a wheel profile with high shape stability,a wheel profile for mitigating the development of wheel OOR,and a wheel profile considering hunting stability and derailment safety are developed,respectively.Yunguang Ye Jonas Vuitton Yu Sun Markus Hecht 2021Railway Engineering Science2021,29,1:3
6Bevacizumab plus oxaliplatin-based chemotherapy as adjuvant treatment for colon cancer (AVANT): a phase 3 randomised controlled trial显示文摘Aimery de Gramont Eric Van Cutsem Hans-Joachim Schmoll Josep Tabernero Stephen Clarke Malcolm J Moore David Cunningham Thomas H Cartwright J Randolph Hecht Fernando Rivera Seock-Ah Im Gy?rgy Bodoky Ramon Salazar Frédérique Maindrault-Goebel Einat Shacham- 2012Lancet Oncology2012,,12:3
7ACCF/ACR/AHA/NASCI/SAIP/SCAI/SCCT 2010 Expert Consensus Document on Coronary Computed Tomographic Angiography显示文摘Daniel B. Mark Daniel S. Berman Matthew J. Budoff J. Jeffrey Carr Thomas C. Gerber Harvey S. Hecht Mark A. Hlatky John McB. Hodgson Michael S. Lauer Julie M. Miller Richard L. Morin Debabrata Mukherjee Michael Poon Geoffrey D. Rubin Robert S. Schwartz 2010Journal of the American College of Cardiology2010,,23:2
8Sensitized photocatalytical oxidation of terbutylazine 显示文摘ROSS H BENDING J HECHT S 1994Sol Energy Mater Sol Cells1994,33,:2
9Phase II Pilot Study of Vemurafenib in Patients With Metastatic BRAF -Mutated Colorectal Cancer显示文摘Kopetz Scott Desai Jayesh Chan Emily Hecht Joel Randolph O’Dwyer Peter J. Maru Dipen Morris Van Janku Filip Dasari Arvind Chung Woonbook Issa Jean-Pierre J. Gibbs Peter James Brian Powis Garth Nolop Keith B. Bhattacharya Suman Saltz Leonard 2015Journal of Clinical Oncology2015,,34:2
10德国开发更安静、更轻型货车转向架显示文摘介绍了德国开发低噪声货车转向架的设计目的、方案选择和所采用的信息技术。Markus Hecht 祝华 2003国外铁道车辆2003,40,3:2
11Smokeless tobacco and cancer显示文摘Paolo Boffetta Stephen Hecht Nigel Gray Prakash Gupta Kurt Straif 2008Lancet Oncology2008,,7:2
12量化铁路车辆机械故障对轨道退化的影响显示文摘目的:了解和量化铁路车辆机械故障对铁路基础设施退化的影响有利于提高列车安全性,合理制定维护策略,以及优化轨道收费模型。本研究为欧洲Shift2Rail-Assets4rail项目的一部分(报告以非公开的形式被递交),旨在量化铁路车辆机械故障对轨道退化的影响,为调整现有的轨道收费模型提供合理的建议。创新点:1.分析一个常见的铁路车辆机械故障(擦伤)对四个用于轨道收费模型的量化指标的影响;2.引入金代理模型方法以减少仿真次数。方法:1.建立一个带有擦伤的机车多体动力学模型,并考虑车轮和轨道的柔性;2.引入金代理模型以量化车辆速度和擦伤尺寸对四种损坏机制(轨道沉降、轨道构件疲劳、钢轨磨耗和钢轨滚动接触疲劳)的影响。结论:1.轨道沉降、轨道构件疲劳和钢轨磨耗随着擦伤尺寸和车速的增加而急剧增加,并且这种增加趋势随着擦伤尺寸和车速的增加而变得更加尖锐。2.在低速时,滚动接触疲劳随着擦伤尺寸的增加而逐渐增加;在高速时,它首先急剧增加,然后逐渐减小。3.擦伤对轨道构件疲劳和钢轨磨耗的影响最为显著,其次是轨道沉降和滚动接触疲劳。Yun-guang YE Da-chuan SHI Sara POVEDA-REYES Markus HECHT 2020Journal of Zhejiang University-Science A(Applied Physics & Engineering)2020,21,10:2
13中国城乡地区的生态卫生(英文)显示文摘在今后的几十年中,中国的城市污水处理领域将需要上百亿美元的投资。当前通过增加城市环境投资来改善水质的做法受到了全球专家的赞许,但是在将卫生策略与高度非逆转投资结合在一起之前,中国应该考虑替代卫生概念的可用性。许多科学家、政策顾问及实业家都高度重视生态卫生,因为从生态和经济意义上讲生态卫生比传统卫生体系更具持续性。通过分析中国的水资源现状、环保法规及水务投资等,指出实施生态卫生工程的必要性,并提出了城市生态卫生的价值链。根据中国城市生态卫生试点项目的经验,详细说明了有关的政策问题。Michael Hecht Hans-Wilhelm Alfen 2006中国给水排水2006,22,23:2
14Thermal stability of SiC fibers (Nicalon) 显示文摘MAH T HECHT N L CULLUM D E Mc 1984J Mater Sci1984,19,4:2
15Similar uptake of lung carcinogens by smokers of regular, light, and ultralight cigarettes 显示文摘HECHT S S MURPHY S E CARMELLA S G 2005Cancer Epidemiol Biomarkers Prev2005,14,3:1
16Skeletal abnormalities in mice lacking extraeellular ma- trix proteins, thrombospondin-1, thrombospondin-3, throm- bospondin-5, and type IX collagen显示文摘Posey KL Hankenson K Veerisetty AC Bornstein P Lawler J Hecht JL 2008Am J Pathol2008,172,6:1
17The effect of monopolar radiofrequency energy on partial-thickness defects of articular cartilage 显示文摘Lu Y Hayashi K Hecht P 2000Arthroscopy2000,16,5:1
18Neuropathy is a major contributing factor to diabetic erectile dysfunction 显示文摘Hecht M J Neundorfer B Kiesewetter F 2001Neurol Bes2001,23,6:1
19Provider assessment of adherence to HIV antiretroviral therapy显示文摘Bangsberg DR Hecht FM Clague H 2001J Acquir Immune Defic Syndr2001,26,:1
20Antibiotics from gliding bacteria, melithiazols A-N: new antifungal β-methoxyacrylates from myxobacteria显示文摘BOHLENDORF B HERRMANN M HECHT H 1999Org Chem1999,99,:1
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