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Assessment of Timoshenko Beam models for Vibrational Behavior of Single-Walled carbon Nanotubes using molecular Dynamics

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Advances in Applied mathematics and mechanics 2009年第1期1卷 89-106页

作者： Y.Y.Zhang c.m.wang V.B.c.Tan Department of mechanical Engineering National University of SingaporeKent RidgeSingapore 119260 Engineering Science Programme and Department of civil Engineering National University of SingaporeKent RidgeSingapore 117574

In this paper,we study the flexural vibration behavior of single-walled carbon nanotubes(SWcNTs)for the assessment of Timoshenko beam ***tensive molecular dynamics(mD)simulations based on second-generation reactive empirical bond-order(REBO)potential and Timoshenko beam modeling are performed to determine the vibration frequencies for SWcNTs with various length-todiameter ratios,boundary conditions,chiral angles and initial *** effectiveness of the local and nonlocal Timoshenko beam models in the vibration analysis is assessed using the vibration frequencies of mD simulations as the *** is shown herein that the Timoshenko beam models with properly chosen parameters are applicable for the vibration analysis of *** simulation results show that the fundamental frequencies are independent of the chiral angles,but the chirality has an appreciable effect on higher vibration *** SWcNTs is very sensitive to the initial strain even if the strain is extremely small.

关键词： Vibration carbon nanotubes molecular dynamics Timoshenko beam models

Simultaneous determination of enthalpies of dilution and dissociation of protocatechuic acid in aqueous salt solutions

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Simultaneous determination of enthalpies of dilution and dis...

pH Effect on the enthalpic interaction coefficients of N-glycylglycine with protocatechuic acid in the phosphate Buffer Solutions

第十七届全国化学热力学和热分析学术会议

作者： Y.Zheng c.m.wang D.Z.Sun m.Liu School of chemistry and chemical Engineering Liaocheng University

Protocatechuic acid has mixed effects on normal and cancer cells in vitro and in vivo studies[1], it possesses antioxidant, anti-inflammatory as well as antihyperglycemic and neuroprotective activities[2]. The enthalpies dilution and dissociation of protocatechuic acid in aqueous potassium chloride or sodium chloride solutions have been measured simultaneously by using mixing-flow microcalorimeter at 298.15 K. The enthalpic interaction coefficients（h2, h3, h4）, along with dissociation constant（Ka） and dissociation enthalpy（△disHm）, in the range of the salt molality（0 to 0.6） mol·kg-1, were calculated through the fit of the experimental data. The dissociation constant and enthalpy determined by the conductivity method and ultraviolet absorption spectrometry method verified the reliability of the fitted thermodynamic parameters. The fitted results indicated that the enthalpic pairwise interaction coefficients h2 of protocatechuic acid in both aqueous salt solutions are all negative and decrease with the increase of the salt molality. The value of h2 in aqueous potassium chloride solutions is larger than that in aqueous sodium chloride solutions of the same molality.

关键词： Protocatechuic acid Enthalpy of dilution Dissociation enthalpies Potassium chloride Sodium chloride

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pH Effect on the enthalpic interaction coefficients of N-gly...

第十七届全国化学热力学和热分析学术会议

作者： c.m.wang Y.Zheng D.Z.Sun m.Liu School of chemistry and chemical Engineering Liaocheng University

Protocatechuic acid plays an important role in the process of killing diseased cells[1-2].The research on the application of protocatechuic acid has attracted a great deal of the *** mixing enthalpies of N-glycylglycine with protocatechuic acid in phosphate buffer solutions at different p H value have been measured by means of mixing-flow isothermal microcalorimetry at the temperature of 298.15 *** heterotactic enthalpic interaction coefficients（hxy,hxxy,and hxyy）in the p H range（3.0 to 8.0）of the buffer solutions have been calculated according to the mc millan–mayer *** results showed that with the increase of the p H value,heterotactic enthalpic pairwise interaction coefficients hxy between N-glycylglycine and protocatechuic acid pass through a minimum at p H *** results are interpreted in terms of the solute-solute and solute-solvent interactions.

关键词： N-glycylglycine protocatechuic acid phosphate buffer solutions pH value mixing enthalpy enthalpic interaction coefficients

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塞来昔布在中国治疗骨关节炎的成本效果研究

中国药房 2017年第5期28卷 586-590页

作者： Bruce c.m.wang 谢小平 Wesley Furnback Ronald caldwell 亦熙有限公司美国纽约10053 辉瑞投资有限公司(北京分公司) 北京100010 密歇根大学密歇根美国安娜堡48109

目的:评估塞来昔布在中国治疗骨关节炎(OA)的成本效果。方法:采用英国国家卫生与临床优化研究所开发的一种OA成本-效果分析模型结构,对照药包括塞来昔布和双氯芬酸+质子泵抑制剂(PPIs);不良事件的相对风险来自cONDOR试验。以质量调整生... 详细信息

目的:评估塞来昔布在中国治疗骨关节炎(OA)的成本效果。方法:采用英国国家卫生与临床优化研究所开发的一种OA成本-效果分析模型结构,对照药包括塞来昔布和双氯芬酸+质子泵抑制剂(PPIs);不良事件的相对风险来自cONDOR试验。以质量调整生命年(QALY)计量有效性;每年以折现率4.76%折减成本和QALY。结果:塞来昔布的成本为$3 591,QALY为8.826年;双氯芬酸+PPIS的成本为$3 674,QALY为8.830年。塞来昔布相对于双氯芬酸+PPIs的增量成本和增量QALY分别为$-83和-0.004QALY。双氯芬酸+PPIS相对于塞来昔布的增量成本效果比(IcER)为$23 258/QALY。单因素敏感度分析和概率敏感度分析结果显示,药物成本是IcER的主要驱动因素,且两种治疗方案的结果相似。结论:塞来昔布是一种成本低于双氯芬酸+PPIs的替代药物。两种用药方案之间的QALY差异非常小,因此塞来昔布可能是OA患者更具成本效果优势的选择。

关键词：骨关节炎塞来昔布双氯芬酸质子泵抑制剂成本效果药物经济学

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受任意激励矩形液体阻尼器的理论和实验研究

世界地震工程 1994年第4期10卷 66-74,23页

作者： c.G.Koh S.mahatma c.m.wang 贲凯

一、前言柔性小阻尼结构产生的振动,不仅会使结构内部的人员感到不舒服,而且会导致结构内的设备发生故障,甚至结构本身发生破坏。因此,对设计者来说,要设法将这些(强迫的或自激的)振动抑止在可以接受的范围内,这是十分重要的。在这方面... 详细信息

一、前言柔性小阻尼结构产生的振动,不仅会使结构内部的人员感到不舒服,而且会导致结构内的设备发生故障,甚至结构本身发生破坏。因此,对设计者来说,要设法将这些(强迫的或自激的)振动抑止在可以接受的范围内,这是十分重要的。在这方面,常常采用被动阻尼器。通常采用的一种被动阻尼器是调谐质量阻尼器(TmD),它在结构振动控制方面很有效。本文讨论另一种利用装有部分粘性液体的容器的被动控制系统。

关键词：阻尼器液体阻尼器实验研究

Dual modulation of homogeneous nanomaterialization and electrochemical activation enhancing zinc ion storage

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Science china chemistry 2025年第1期68卷 385-393页

作者： Jianwei wang Huan wang Kangning wang Wenhui wang Wenlin Zhang Yanzhong Zhen School of chemistry&chemical Engineering Yan’an UniversityYan’an 716000China

Vanadium-based electrode materials are widely investigated,but the low specific capacity and slow electrochemical kinetics in aqueous zinc-ion batteries still limit their commercial ***,the VS_(2)/ca V_(4)O_(9)material with the morphology of nanoflower was synthesized by a one-step hydrothermal *** to the blocky structure of pure VS_(2)material,the VS_(2)/ca V_(4)O_(9)material is composed of thinner homogeneous *** open structures could provide abundant electrochemical active sites and ion transport channels,and then promote the electrochemical reaction *** addition,they can also buffer the bulk strain during the reaction *** improve the utilization of vanadium elements,an in-situ electrochemical activation strategy is used to explore the storage performance of the VS_(2)/ca V_(4)O_(9)material,the different activation voltage range of 0.4–1.6 and 0.4–1.4 V are selected,*** with the longer activation plateau of activated-VS_(2),the VS_(2)/ca V_(4)O_(9)cathode could quickly reach the activation state in the range of 1.4–1.6 V and cause the release of additional Zn storage sites *** VS_(2)/ca V_(4)O_(9)cathode delivers a higher power density of 37,000 W kg^(-1)and a significant energy density of 423 Wh kg^(-1).At the high current density of 15 A g^(-1),the VS_(2)/ca V_(4)O_(9)cathode still has a discharge capacity of 183.9m Ah g^(-1)after 5,000 cycles,and the capacity decay rate per cycle is only 0.0042%.continuous cyclic voltammetry(cV)curves,electrochemical impedance spectroscopy(EIS)measurements,density functional theory(DFT)calculation and galvanostatic intermittent titration technique(GITT)measurements demonstrate that the VS_(2)/ca V_(4)O_(9)cathode has a faster ion diffusion/charge transfer ***,the assembled flexible device has an excellent mechanical stability.

关键词： dual modulation homogeneous nanomaterialization electrochemical activation zinc ion storage

The Dynamics of a Stochastic SEITR model for Tuberculosis with Incomplete Treatment

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Acta mathematicae Applicatae Sinica 2025年第1期41卷 99-113页

作者： Xiao-dong wang Kai wang Department of medical Engineering and Technology Xinjiang Medical UniversityUrumqiXinjiang 830017China

In this paper,a stochastic SEITR model is formulated to describe the transmission dynamics of tuberculosis with incompletely *** conditions for the existence of a stationary distribution and extinction are *** addition,numerical simulations are given to illustrate these analytical *** and numerical results show that large environmental perturbations can inhibit the spread of tuberculosis.

关键词： tuberculosis stationary distribution extinction

No-go guide for the Hubble tension:Late-time or local-scale new physics

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Science china(Physics,mechanics & Astronomy) 2025年第2期68卷 73-85页

作者： Lu Huang Shao-Jiang wang wang-Wei Yu cAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences(CAS)Beijing100190China Asia Pacific center for Theoretical Physics(APcTP) Pohang37673Korea max-Planck-Institut für Gravitationsphysik(Albert-Einstein-Institut) HannoverD-30167Germany Leibniz Universität Hannover Hannover30167Germany

The standard model of modern cosmology might be cracked by the recent persistent hot debate on the Hubble-constant(H_(0))tension,which manifests itself as the sound-horizon(r_(s))tension or absolute-magnitude(m_(B))tension if deeming the origin of the Hubble tension from modifying the early or late Universe,*** this study,we achieve a fully model-independent constraint(fitting a model-independent global parameterization to a model-independent inverse distant ladder with a modelindependent high-redshift calibration)on late-time models with strong evidence against homogeneous new physics over theΛ-cold-dark-matter(ΛcDm)*** using this model-independent constraint to calibrate sufficiently local supernovae with corresponding late-time models extrapolated below the homogeneity scale,we find surprisingly that,although both H_(0)tension and mB tension are absent in our local Universe,a combination of H_(0)and m_(B)as the intercept a B of the magnitude-redshift relation exhibits 3~7σtension even for theΛcDm *** aBtension seems to call for local-scale inhomogeneous new physics disguised as local observational systematics.

关键词： Hubble constant inverse distance ladder local Universe

Exhumation and Preservation of the Yangchuling Porphyry W-mo Deposit in the Jiangnan Tungsten Ore Belt,South china:Insights from(U-Th)/He and Fission Track Dating

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Journal of Earth Science 2025年第1期36卷 46-56页

作者： Yue Sun Ying wang Jianzhang Pang Samuel c.Boone minting Wu chongjian Shao Wei Liu Jiangxi Provincial Key Laboratory of Genesis and Prospect for Strategic minerals School of Earth ScienceEast China University of TechnologyNanchang330013China Institute of Geology china Earthquake Administration Beijing100029China School of Geography Earth and Atmospheric Sciences The University of MelbourneMelbourneVIC3010Australia Department of Earth Sciences The University of AdelaideAdelaideSA5005Australia Jiangxi Duchang JinDing Tungsten cO. Ltd.Jiujiang332611China

The Yangchuling porphyry W-mo deposit(YPWD),located in the Jiangnan porphyryskarn tungsten ore belt,is one of the most important and large-scale porphyry W-mo deposits in South *** previous zircon U-Pb and molybdenite Re-Os data suggest that Yangchuling Wmo ore bodies formed almost simultaneously with granodiorite and monzogranitic porphyry at~150–144 ma,their post emplacement history remains poorly understood,making their preservation status at depth *** this paper,new zircon and apatite(U-Th)/He and apatite fission track(ZHe,AHe and AFT,respectively)data of one hornfels and five intrusive rocks from a 1000-meter borehole are ***,together with new inverse thermal history models and previous geochronological data,help elucidate the post-diagenetic exhumation history and preservation status of the Yangchuling porphyry W-mo *** general,ZHe and AHe ages decrease gradually from the near surface downwards and have relatively little intra-sample variation,ranging from 133 to 73ma and 67 to 25 ma,*** four granodiorites yield similar AFT ages that range from 63 to 55 ma with mean track lengths varying from 12.2±0.7 to 12.6±0.5μ*** history modelling indicates that the Yangchuling ore district experienced slow,monotonic cooling since the ***-depth relationships are interpreted as recording~3.7±0.8 km of cretaceous-recent exhumation in response to regional extension throughout South china thought to have been driven by subduction retreat of the Paleo-Pacific *** of estimated net exhumation and previous metallogenic depth of~4–5 km suggests that W-mo ore bodies could still exist at depths of up to~1.3±0.8 km relative to Earth surface in the YPWD *** of the YPWD is attributed to the limited amount of regional denudation during the Late cretaceous and cenozoic.

关键词： (U-Th)/He fission track ore preservation thermochronology Yangchuling porphyry W-mo deposit