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Effect of compressibility on the hypervelocity penetration

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

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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

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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

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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

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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

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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

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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

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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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Nanowrinkled Carbon Aerogels Embedded with FeN_(x) Sites as Effective Oxygen Electrodes for Rechargeable Zinc-Air Battery

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Research 2019年第1期2019卷 1-13页

作者： Ting He Bingzhang Lu Yang chen Yong Wang Yaqiang Zhang John L.Davenport Alan p.chen Chih-Wen pao Min Liu Zhifang Sun Alexander Stram Alexander Mordaunt Jairo Velasco Jr Yuan ping Yi Zhang Shaowei chen State Key Laboratory for powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCalifornia 95064USA Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaCanada T6G 1H9 Department of physics University of California1156 High StreetSanta CruzCalifornia 95064USA X-Ray Absorption Group National Synchrotron Radiation Research CenterHsinchu 30076Taiwan Institute of Super-Microstructure and Ultrafast process in Advanced Materials School of Physics and ElectronicsCentral South UniversityChangsha 410083China Key Laboratory of Materials processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China

Rational design of single-metal atom sites in carbon substrates by a flexible strategy is highly desired for the preparation of high-performance catalysts for metal-air *** this study,biomass hydrogel reactors are utilized as structural templates to prepare carbon aerogels embedded with single iron atoms by controlled *** tortuous and interlaced hydrogel chains lead to the formation of abundant nanowrinkles in the porous carbon aerogels,and single iron atoms are dispersed and stabilized within the defective carbon skeletons.X-ray absorption spectroscopy measurements indicate that the iron centers are mostly involved in the coordination structure of FeN_(4),with a minor fraction(ca.1/5)in the form of FeN_(3)***-principles calculations show that the FeN_(x) sites in the Stone-Wales configurations induced by the nanowrinkles of the hierarchically porous carbon aerogels show a much lower free energy than the normal *** resulting iron and nitrogen-codoped carbon aerogels exhibit excellent and reversible oxygen electrocatalytic activity,and can be used as bifunctional cathode catalysts in rechargeable Zn-air batteries,with a performance even better than that based on commercial pt/C and RuO_(2) *** from this study highlight the significance of structural distortions of the metal sites in carbon matrices in the design and engineering of highly active single-atom catalysts.

关键词： Oxygen charge skeleton

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《现代汉语:历史与社会语言学》述评

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当代语言学 2006年第3期8卷 265-271页

作者： p.chen 李晋霞（述评）刘云（述评）不详北京师范大学文学院 100871 华中师范大学语言学系 430079

chen ping（陈平）《现代汉语：历史与社会语言学》（Modern Chinese：Its History and Sociolinguistics）1999年由剑桥大学出版社出版。该书主要是供国外的汉语教师和学生使用的。可能是基于这样一个写作目的，作者以还原现代汉语的... 详细信息

chen ping（陈平）《现代汉语：历史与社会语言学》（Modern Chinese：Its History and Sociolinguistics）1999年由剑桥大学出版社出版。该书主要是供国外的汉语教师和学生使用的。可能是基于这样一个写作目的，作者以还原现代汉语的发展史为目标，在历史和社会的大背景下，从现代汉语口语、现代汉语书面语、现代汉语书写系统三个方面出发，对自19世纪末至1990年代的现代汉语的产生、发展过程进行了翔实、全面的考察，对外国人系统了解现代汉语和汉语的现代化过程极有帮助。

关键词：现代汉语书面语社会语言学历史剑桥大学出版社述评书写系统 19世纪末现代化过程

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