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163篇 您的检索式:作者名="L. Feng"
    题名 作者 年代 出处 被引量
1PHYSICAL MODELING FOR THE MECHANISMS OF BEAD FORMATION DEFECTS BASED ON THE STABILITY OF LIQUID METAL显示文摘Based on the theory of stability of the liquid metal under the action of surface tension,a physical mod- el is established for the mechanisms of the bead formation deferct’ humping’, which is generated during high - speed welding.A boundary function is introduced to correct the model,theoretical results got by the model correspond well with the experimental phenomena. A two - dimensional conducting model is adoopted in the simulation of the temperature field during high - speed welding.Finally, the factors acting upon the stability of liquid metal are analyzed.S. Y. Yin L. Feng J. Z. Ding and S. J. Chan( 1) Beijing Polytechnic University, Beijing 100022, China 2) National Key Laboratory of Advanced Wdlding Production Technology, HIT, Harbin 150001, China) 2000Acta Metallurgica Sinica(English Letters)2000,13,1:28
2COMPUTERIZED SIMULATION AND EXPERIMENTAL RESEARCH ON SOFT-SWITCHING ARC WELDING INVERTER POWER SOURCE显示文摘Based on the existing component models in the Pspice software package, a combined model for Insulat- ed the Bipolar Transistor (IGBT) is established, in which a non - linear is introduced to represent the parasitic capacitance. Using this model, computerized simulation is conducted for the FB - ZVZCS - PWM soft - ewitching converter,the switching and energy-transferring characteristics of the components are analyzed.The simulation results are testified by experiments.It is proved that by abopting appropriate models,computerized simulation becomes an effective tool for investigation of arc welding inverter power source.S. J. Chen S. Y. Yin L. Feng and L. Y. Li( 1) School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, China 2)National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 150001, China) 2000Acta Metallurgica Sinica(English Letters)2000,13,1:24
3WS2 nanoflakes from nanotubes for electrocatalysis显示文摘为切开的水的下一代的催化剂向可更新的氢经济是关键的。MoS2 和 WS2 在边地点与高催化的活动代表地球丰富的、高贵金属阴极选择。在他们的开发的一挑战是这些材料到 nanostructure 以便通过另外的边地点的创造完成增加的性能。在这个工作,我们表明一条简单线路用 sonochemical 脱落形成 nanostructured-WS2 在 WS2 nanotubes 打破夹层和 intralayer 契约。产生很少层 nanoflakes 是与边地点的高密度宽的 100 nm。WS2 nanoflakes 为氢进化反应作为阴极被利用(她的) 并且展览上级性能到 WS2 nanotubes 和体积粒子与一个更低的发作潜力,更浅的 Tafel 斜坡和增加的当前的密度。未来工作可以采用进一步改进 electrocatalytic 活动的极端小的 nanoflakes,掺杂物原子,或 graphene 混血儿。Charina L. Choi Ju Feng Yanguang Li Justin Wu Alia Zak Reshef Tenne Hongjie Dai 2013Nano Research2013,6,12:11
4Non-transgenic Plant Genome Editing Using Purified Sequence-Specific Nucleases显示文摘Dear Editor, Sequence-specific nucleases,including zinc-finger nucleases,meganucleases,TAL effector nucleases (TALENs),and CRISPR/ Cas systems,have been used to introduce targeted mutations in a wide range of plant species (Voytas,2013;Baltes and Voytas,2015).However,delivery of these nucleases using traditional transformation methods (e.g.,particle bombardment,Agrobacterium or protoplast transformation) may result in undesired genetic alterations due to random insertion of nucleaseencoding DNA intothe host genome.Song Luo Jin Li Thomas J. Stoddard Nicholas J. Baltes Zachary L. Demorest Benjamin M. Clasen Andrew Coffman Adam Retterath Luc Mathis Daniel F. Voytas Feng Zhang 2015Molecular Plant2015,8,9:7
5Experimental Investigation of Forced Convective Boiling Flow Instabilities in Horizontal Helically Coiled Tubes显示文摘ExperimentalInvestigationofForcedConvectiveBoilingFlowInstabilitiesinHorizontalHelicallyCoiledTubesL.J.Guo;Z.P.Feng;X.J.Chen(...L. J. Guo Z. P. Feng X. J. Chen N. H. Thomas 1996Journal of Thermal Science1996,5,3:5
6Effects of PI3-k/Akt short hairpin RNA on proliferation, fibronectin production and synthesis of thrombospondin-1 and transforming growth factor-beta(1 ) in glomerular mesangial cells induced by sublytic C5b-9 complexes显示文摘Gao, L. Zhang, Y. Qiu, W. Xu, W. Feng, X. Ren, J. Jiang, X. Wang, H. Zhao, D. Wang, Y. 2009南京医科大学学报(自然科学版)2009,29,3:5
7Prevalence of polycystic ovary syndrome in women in China: a large community-based study显示文摘Rong Li Qiufang Zhang Dongzi Yang Shangwei Li Shulan Lu Xiaoke Wu Zhaolian Wei Xueru Song Xiuxia Wang Shuxin Fu Jinfang Lin Yimin Zhu Yong Jiang Huai L. Feng Jie Qiao 2013Human Reproduction2013,,9:4
8Occurrence of avian leukosis virus subgroup J in commercial layer flocks in China显示文摘Binrui Xu Weixing Dong Chunming Yu Zhaoqing He Yanli Lv Yanzheng Sun Xiaoyu Feng Ning Li L. F. Lee Maoxiang Li 2004Avian Pathology2004,,1:3
9Hydrogen sulfide therapy attenuates the inflammatory response in a porcine model of myocardial ischemia/reperfusion injury显示文摘Neel R. Sodha Richard T. Clements Jun Feng Yuhong Liu Cesario Bianchi Eszter M. Horvath Csaba Szabo Gregory L. Stahl Frank W. Sellke 2009The Journal of Thoracic and Cardiovascular Surgery2009,,:3
10Herpes Simplex Virus Type 2 Risks in Female Sex Workers in the China-vietnam Border County of Hekou显示文摘Objective To survey the prevalence and risk factors of HSV-2 among Chinese and Vietnamese female sex workers (FSW) in the border county of Hekou, Yunnan Province, China. Methods A cross-sectional survey was conducted on demographics, sexual behavior, medical history, and drug use among FSWs. Laboratory samples were obtained to test for HSV-2 and other STIs such as HIV, Syphilis, Trichomonas vaginalis, Neisseria gonorrhoeae, Chlamydia trachomatis, Bacterial vaginosis, and Yeast infections. Cervicitis and genital warts were also diagnosed. Results Of the 345 FSWs who participated in this study, 112 (32.5%) were ethnic Chinese and 233 (67.5) were Vietnamese. Among FSWs in Hekou, the prevalence rates were 58.3% for HSV-2, 5.5% for HIV, and 4.1% for bacterial vaginosis (BV). Age <21 (OR: 0.5; 95% CI: 0.3, 0.8), duration of commercial sex work ≤3 months (OR: 0.5; 95% CI: 0.3, 0.8), oral and vaginal sex with the last client (as opposed to only vaginal sex) (OR: 1.6; 95% CI: 1.0, 2.7), HIV (OR: 11.4; 95% CI: 1.5, 87.2), and bacterial vaginosis (BV) (OR: 5.6; 95% CI: 1.2, 26.9) were significantly correlated with HSV-2 infection. Conclusion Multivariate analysis showed that several factors were significantly correlated with the high prevalence of HSV-2 in FSWs in the border area between China and Vietnam. Further studies and interventions are needed for HSV-2 epidemiology in the border area.WANG Jun Jie ZHU Zhi Bin YANG Xi WU Jing WANG Hai BO FENG Lin DING Guo Wei Jessie L. NORRIS WANG Ning 2012Biomedical and Environmental Sciences2012,25,6:3
11Grain refinement mechanism of multiple laser shock processing impacts on ANSI 304 stainless steel显示文摘J.Z. Lu K.Y. Luo Y.K. Zhang G.F. Sun Y.Y. Gu J.Z. Zhou X.D. Ren X.C. Zhang L.F. Zhang K.M. Chen C.Y. Cui Y.F. Jiang A.X. Feng L. Zhang 2010Acta Materialia2010,,16:3
12A new genus of Asiatic short-tailed shrew (Soricidae, Eulipotyphla) based on molecular and morphological comparisons显示文摘Blarinellini is a tribe of soricine shrews comprised of nine fossil genera and one extant genus. Blarinelline shrews were once widely distributed throughout Eurasia and North America, though only members of the Asiatic short-tailed shrew genus Blarinella currently persist(mostly in southwestern China and adjacent areas). Only three forms of Blarinella have been recognized as either species or subspecies.However, recent molecular studies indicated a strikingly deep divergence within the genus, implying the existence of a distinct genus-level lineage. We sequenced the complete mitochondrial genomes and one nuclear gene of three Asiatic short-tailed and two North American shrews and analyzed them morphometrically and morphologically. Our molecular analyses revealed that specimens ascribed to B. griselda formed two deeply diverged lineages,one a close relative to B. quadraticauda, whereas the other—comprised of topotype specimens from southern Gansu—diverged from other Blarinella in the middle Miocene(ca. 18.2 million years ago(Ma),95% confidence interval=13.4–23.6 Ma). Although the skulls were similarly shaped in both lineages, we observed several diagnostic characteristics, including the shape of the upper P^4. In consideration of the molecular and morphological evidence, we recognize B. griselda as the sole species of a new genus, namely, Pantherina gen. nov. Interestingly,some characteristics of Pantherina griselda are more similar to fossil genera, suggesting it represents an evolutionarily more primitive form than Blarinella.Recognition of this new genus sheds light on the systematics and evolutionary history of the tribe Blarinellini throughout Eurasia and North America.Kai He Xing Chen Peng Chen Shui-Wang He Feng Cheng Xue-Long Jiang Kevin L. Campbell 2018Zoological Research2018,39,5:3
13Comparison of laparoscopically assisted and open radical distal gastrectomy with extended lymphadenectomy for gastric cancer management显示文摘W. Ziqiang Q. Feng C. Zhimin W. Miao Q. Lian L. Huaxing Y. Peiwu 2006Surgical Endoscopy2006,,11:2
14The arc characteristics and metal transfer behaviour of cold metal transfer and its use in joining aluminium to zinc-coated steel显示文摘H.T. Zhang J.C. Feng P. He B.B. Zhang J.M. Chen L. Wang 2008Materials Science & Engineering A2008,,1:2
15Is High Serum Uric Acid a Risk Marker or a Target for Treatment? Examination of its Independent Effect in a Large Cohort With Low Cardiovascular Risk显示文摘Chi Pang Wen Ting-Yuan David Cheng Hui Ting Chan Min Kuang Tsai Wen-Shen Isabella Chung Shan Pou Tsai Mark L. Wahlqvist Yi Chen Yang Shiuan Be Wu Po Huang Chiang Sung Feng Wen 2010American Journal of Kidney Diseases2010,,2:2
16The accuracy of circulating micro RNA ‐21 in the diagnosis of colorectal cancer: a systematic review and meta‐analysis显示文摘F. Xu L. Xu M. Wang G. An G. Feng 2015Colorectal Dis2015,,5:2
17Study on the relationship between structure and enantioselectivity of a hyperthermophilic esterase from archaeon Aeropyrum pernix K1显示文摘Zhang, G. R. Gao, R. J. Zheng, L. Y. Zhang, A. J. Wang, Y. H. Wang, Q. Y. Feng, Y. Cao, S. G. 2007中国生物学文摘2007,21,4:2
18MicroRNAs Are Differentially Expressed in Ulcerative Colitis and Alter Expression of Macrophage Inflammatory Peptide-2α显示文摘Feng Wu Michelle Zikusoka Anil Trindade Themistocles Dassopoulos Mary L. Harris Theodore M. Bayless Steven R. Brant Shukti Chakravarti John H. Kwon 2008Gastroenterology2008,,:2
19Ten-Microsecond Molecular Dynamics Simulation of a Fast-Folding WW Domain显示文摘Peter L. Freddolino Feng Liu Martin Gruebele Klaus Schulten 2008Biophysical Journal2008,,10:2
20The arc characteristics and metal transfer behaviour of cold metal transfer and its use in joining aluminium to zinc-coated steel显示文摘H.T. Zhang J.C. Feng P. He B.B. Zhang J.M. Chen L. Wang 2008Materials Science & Engineering A2008,,1:2
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