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Effect of compressibility on the hypervelocity penetration

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Acta Mechanica Sinica 2018年第1期34卷 82-98页

作者： W.J.Song X.W.chen p.chen Department of Mechanics and Engineering Science College of Engineering Peking University Advanced Research Institute for Multidisciplinary Science Beijing Institute of Technology The State Key Lab of Explosion Science and Technology Beijing Institute of Technology Centre for Applied physics and Technology (CApT) Peking University

We further consider the effect of rod strength by employing the compressible penetration model to study the effect of compressibility on hypervelocity ***, we define different instances of penetration efficiency in various modified models and compare these penetration efficiencies to identify the effects of different factors in the compressible model. To systematically discuss the effect of compressibility in different metallic rod-target combinations, we construct three cases, i.e., the penetrations by the more compressible rod into the less compressible target, rod into the analogously compressible target, and the less compressible rod into the more compressible target. The effects of volumetric strain, internal energy, and strength on the penetration efficiency are analyzed simultaneously. It indicates that the compressibility of the rod and target increases the pressure at the rod/target interface. The more compressible rod/target has larger volumetric strain and higher internal energy. Both the larger volumetric strain and higher strength enhance the penetration or anti-penetration ability. On the other hand, the higher internal energy weakens the penetration or anti-penetration ability. The two trends conflict, but the volumetric strain dominates in the variation of the penetration efficiency, which would not approach the hydrodynamic limit if the rod and target are not analogously compressible. However, if the compressibility of the rod and target is analogous, it has little effect on the penetration efficiency.

关键词： Compressibility Hypervelocity penetration Equation of state(EOS) Shockwave Bernoulli equation

An efficient SpH methodology for modelling mechanical characteristics of particulate composites

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Defence Technology（防务技术） 2021年第1期17卷 135-146页

作者： Z.J.Zheng S.Kulasegaram p.chen Y.Q.chen Department of Mechanics College of Mechanical EngineeringChongqing University of TechnologyChongqing400054China Institute of Applied and Computational Mechanics Cardiff School of EngineeringCardiff UniversityQueen’s BuildingsThe ParadeCardiffCF243AAWalesUK Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing100871China

particulate composites are one of the widely used materials in producing numerous state-of-the-art components in biomedical,automobile,aerospace including defence *** of modelling techniques have been adopted in the past to model mechanical behaviour of particulate *** to their favourable properties,particle-based methods provide a convenient platform to model failure or fracture of these *** particle hydrodynamics(SpH)is one of such methods which demonstrate excellent potential for modelling failure or fracture of particulate composites in a Lagrangian *** of the major challenges in using SpH method for modelling composite materials depends on accurate and efficient way to treat interface and boundary *** this paper,a masterslave method based multi-freedom constraints is proposed to impose essential boundary conditions and interfacial displacement constraints in modelling mechanical behaviour of composite materials using SpH *** proposed methodology enforces the above constraints more accurately and requires only smaller condition number for system stiffness matrix than the procedures based on typical penalty function approach.A minimum cut-off value-based error criteria is employed to improve the computational efficiency of the proposed *** addition,the proposed method is further enhanced by adopting a modified numerical interpolation scheme along the boundary to increase the accuracy and computational *** numerical examples demonstrate that the proposed master-slave approach yields better accuracy in enforcing displacement constraints and requires approximately the same computational time as that of penalty method.

关键词： particulate composites SpH Essential boundary condition Multi-point constraints Master-slave method

Thouless pumping in disordered photonic systems

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Light(Science & Applications) 2020年第1期9卷 295-301页

作者： Alexander Cerjan Mohan Wang Sheng Huang Kevin p.chen Mikael C.Rechtsman Department of physics The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Electrical and Computer Engineering University of PittsburghPittsburghPA 15261USA

Thouless charge pumping protocols provide a route for one-dimensional systems to realize topological ***,using arrays of evanescently coupled optical waveguides,we experimentally demonstrate bulk Thouless pumping in the presence of *** degree of pumping is quite tolerant to significant deviations from adiabaticity as well as the addition of system disorder until the disorder is sufficiently strong to reduce the bulk mobility gap of the system to be on the scale of the modulation frequency of the ***,we show that this approach realizes near-full-unit-cell transport per pump cycle for a physically relevant class of localized initial system ***,temporally pumped systems can potentially be used as a design principle for a new class of modulated slow-light devices that are resistant to system disorder.

关键词： pumping pumped pump

紫外线对离子互补型自组装寡肽EAK16-II聚集状态的影响

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华南理工大学学报（自然科学版） 2006年第8期34卷 51-54页

作者：欧阳新平 p.chen 华南理工大学化工与能源学院广东广州510640 Dept.of Chemical Engineering Univ.of Waterloo200 Univ.Avenue Waterloo Ontario CanadaN2L3G1

借助原子力显微镜对离子互补型自组装寡肽EAK16-II在水溶液中自组装聚集形态受紫外线的影响进行了研究.研究结果表明,紫外线改变了该类寡肽在水溶液中自组装形成的纳米结构.当用波长为365 nm的紫外线照射2 h后,离子互补型自组装寡肽的... 详细信息

借助原子力显微镜对离子互补型自组装寡肽EAK16-II在水溶液中自组装聚集形态受紫外线的影响进行了研究.研究结果表明,紫外线改变了该类寡肽在水溶液中自组装形成的纳米结构.当用波长为365 nm的紫外线照射2 h后,离子互补型自组装寡肽的聚集态从纤维状结构转变为球形结构.从成核模型分析,其原因是由于紫外线照射导致了自组装聚集体分子间作用力的破坏以及β片层向β转角的转变.

关键词：自组装寡肽聚集状态紫外线原子力显微镜

Enhancing the graphene photocurrent using surface plasmons and a p-n junction

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Light(Science & Applications) 2020年第1期9卷 793-802页

作者： Di Wang Andres E.Llacsahuanga Allcca Ting-Fung Chung Alexander V.Kildishev Yong p.chen Alexandra Boltasseva Vladimir M.Shalaev School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47907USA Birck Nanotechnology Center Purdue UniversityWest LafayetteIN 47907USA Department of physics and Astronomy Purdue UniversityWest LafayetteIN 47907USA purdue Quantum Science and Engineering Institute(pQSEI) Purdue UniversityWest LafayetteIN 47907USA

The recently proposed concept of graphene photodetectors offers remarkable properties such as unprecedented compactness,ultrabroadband detection,and an ultrafast response ***,owing to the low optical absorption of pristine monolayer graphene,the intrinsically low responsivity of graphene photodetectors significantly hinders the development of practical *** address this issue,numerous efforts have thus far been made to enhance the light–graphene interaction using plasmonic *** approaches,however,can be significantly advanced by leveraging the other critical aspect of graphene photoresponsivity enhancement-electrical junction *** has been reported that the dominant photocarrier generation mechanism in graphene is the photothermoelectric(pTE)***,the two energy conversion mechanisms involved in the graphene photodetection process are light-to-heat and heat-to-electricity *** this work,we propose a meticulously designed device architecture to simultaneously enhance the two conversion ***,a gap plasmon structure is used to absorb a major portion of the incident light to induce localized heating,and a pair of split gates is used to produce a p-n junction in graphene to augment the pTE current *** gap plasmon structure and the split gates are designed to share common key components so that the proposed device architecture concurrently realizes both optical and electrical *** experimentally demonstrate the dominance of the pTE effect in graphene photocurrent generation and observe a 25-fold increase in the generated photocurrent compared to the un-enhanced *** further photocurrent enhancement can be achieved by applying a DC bias,the proposed device concept shows vast potential for practical applications.

关键词： electrical plasmon hinder

pD173074, a selective FGFR inhibitor, reverses MRp7 (ABCC10)-mediated MDR

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Acta pharmaceutica Sinica B 2014年第3期4卷 202-207页

作者： Nagaraju Anreddy Atish patel Kamlesh Sodani Rishil J.Kathawala Eugenie p.chen John N.D.Wurpel Zhe-Sheng chen Department of pharmaceutical Sciences College of Pharmacy and Health SciencesSt.John's UniversityQueensNY 11439USA

Multidrug resistance protein 7(MRp7,ABCC10)is a recently identified member of the ATp-binding cassette(ABC)transporter family,which adequately confers resistance to a diverse group of antineoplastic agents,including taxanes,vinca alkaloids and nucleoside analogs among *** studies indicate an increased MRp7 expression in non-small cell lung carcinomas(NSCLC)compared to a normal healthy lung *** studies revealed increased paclitaxel sensitivity in the Mrp7^(-/-)mouse model compared to their wild-type *** demonstrates that MRp7 is a key contributor in developing drug *** our group reported that pD173074,a specific fibroblast growth factor receptor(FGFR)inhibitor,could significantly reverse p-glycoprotein-mediated ***,whether pD173074 can interact with and inhibit other MRp members is *** the present study,we investigated the ability of pD173074 to reverse MRp7-mediated *** found that pD173074,at non-toxic concentration,could significantly increase the cellular sensitivity to MRp7 *** studies indicated that pD173074(1μmol/L)significantly increased the intracellular accumulation and in-turn decreased the efflux of paclitaxel by inhibiting the transport activity without altering expression levels of the MRp7 protein,thereby representing a promising therapeutic agent in the clinical treatment of chemoresistant cancer patients.

关键词： pD173074 ABCC10 Fibroblast growth factor receptor Multidrug resistance Tyrosine kinase inhibitor

一个用于求解关系模式上最小函数依赖集合(F)min的算法

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计算机工程 1989年第6期4卷 32-42页

作者：应振树 peter p.chen 上海工业大学路易斯安纳州立大学

本文介绍一个采用DDHD技术求解关系模式上最小函数依赖集合(F)min的算法,采用这种方法可以方便地从任意给定的函数依赖集合F直接求得相应的最小函数依赖集合,这种方法是关系数据库设计和规范化的有用工具。

关键词：关系数据库 DDHD技术函数依赖

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中国传统文化经典故事100篇 1

Appropriate use criteria for cardiac catheterization and coronaryrevascularization

丛书名：英语漫话中国文化系列

2007年

作者：任秀桦 STEVE p.chen译

本书精选了中国古代寓言故事、中国古代民间传说和中国古代神话故事精品100篇，配以生动、传神的插图和简明流畅的英文。

ISBN: (数字)9787561137901

ISBN: (纸本)9787561137901

本书精选了中国古代寓言故事、中国古代民间传说和中国古代神话故事精品100篇，配以生动、传神的插图和简明流畅的英文。

关键词：作品集对照读物英语汉语中国故事

来源：畅想之星图书光盘版（南... 评论

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Chinese Medical Journal 2014年第6期127卷 1161-1165页

作者： Jack p.chen Thach Nguyen Faisal Latif Theodore A.Bass Department of Medicine Northside Hospital Atlanta Georgia USA Indiana University School of Medicine Community Healthcare System St Mary Medical Center Hobart Indiana USA Department of Medicine Cardiovascular Section VA Medical Center and University of Oklahoma Health Sciences Center Oklahoma CityOklahoma USA Division of Cardiology University of Florida USA

Challenges Since its inception,the field of invasive and interventionalcardiology has witnessed tremendous procedural andtechnological advancements,thereby offering quantumexpansion in clinical *** the complexity ofth... 详细信息

关键词： appropriate use criteria cardiac catheterization percutaneous coronary intervention treadmill risk factors