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An elastic-plastic constitutive framework for micropolar continua

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An elastic-plastic constitutive framework for micropolar con...

Titanium Dioxide Nanoparticle Absorbed by Hepatoma Cells in Vitro

第五届国际非线性力学会议

作者： Zhu-ping Huang~1,Geng-kai Hu~2.Hong-wu Zhang~3.(1.LTCS and Department of mechanics,Peking {2.,Beijing 100871,China 2.Department of {2. mechanics,Beijing institute of technology,Beijing 100081,China 3.SAIL,Department of Engineering mechanics,Dalian {2. of technology,Dalian 11602.,China)

＜正＞In this paper,a rate-type constitutive framework in micropolar plasticity is presented. In order to describe the plastic dissipation in the deformation process,a set of internal variables is introduced,thus the Helmholtz free energy can be expressed as a function of the non-symmetric strain,rotation and internal *** the introduction of the loading（yield） surfaces both in the non-symmetric strain and rotation space,and in the work conjugate non-symmetric stress and couple stress space,a loading-unloading criterion for a micropolar plastic material is suggested,and three types of material response,namely hardening,softening and perfectly plastic behaviors are *** on a mechanical postulate of non-negative work proposed by the present authors,the normality condition and the corresponding incremental constitutive relations are *** present results can be applied for the description of path-dependent mechanical behaviors of micropolar elastic-plastic materials.

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Journal of Wuhan university of technology(Materials Science) 2005年第3期20卷 31-34页

作者：扈盛李世普 biomedical Materials and Engineering Center Wuhan University of Technology

It is reported thut nanoporticles can be applied as carriers and anti-cancer medicines. But the interaction of nanoparticles and cells is unclear. The purpose of this study was to discuss whether inorganic crystal nanoparticles can get through cells with intact crystal. BEL7402.heputoma cells and titanium dioxide （ TiO2.） nanoporticles were selected and incubated together in vitro. All specimens were prepared and observed under a traasmission electron mieroscope （TEM）. TiO2.nanopartieles were found not in the nuclear area but in the cytoplasma. TiO2.nanoponieles maintained the plate-like shape during absorbing. The result shows that hepatoma cells can endocytose the intact TiO2.crystal nanoparticles. It implies that novel nano-effect plays an important role in the biomedicinal application of inorganic crystal nanopartieles.

关键词： titanium dioxide nanoparticle hepatoma cell in vitro

THE FLOW PRODUCED IN PARTICLE-SUSPENSION BY AN INFINITE ROTATING DISK:SERIES SOLUTION

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Journal of Hydrodynamics 1992年第1期4卷 8-15页

作者： Din Xue-dong Shanghai university of technology,Shanghai {2. of {3. Mathematics & mechanics,Shanghai 2.0072.P.R.ChinaXu Xue-zi Zhejiang university,Hangzhou 3.002.,P.R.China

To the flow produced in particle-suspension by a rotating disk of infinite extent, the asymptotic behavior at infinity is analyzed.A corresponding series solution is *** is shown that this approach yields widely valid solutions of high accuracy for all the cases in which that suction or weak injection at the disk surface *** the cases that strong injection or par- ticle-free band exists,the series method fails.

关键词： rotating disk particle-suspension series solution suction injection

Effects of viscosity on shock-induced damping of an initial sinusoidal disturbance

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Science China(Physics,mechanics & Astronomy) 2010年第5期53卷 802-806页

作者： MA XiaoJuan1,LIU FuSheng1 & JING FuQian2.1 College of Physical Science and technology,Southwest Jiaotong university,Chengdu 6100{2.,China 2.Laboratory for Shock Wave and Detonation Physics Research,{2. of Fluid Physics,Chinese Academy of Engineering Physics,Mianyang 62.900,China College of Physical Science and technology Southwest Jiaotong University Chengdu China Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang China

A lack of reliable data treatment method has been for several decades the bottleneck of viscosity measurement by disturbance amplitude damping method of shock *** this work the finite difference method is firstly applied to obtain the numerical solutions for disturbance amplitude damping behavior of sinusoidal shock front in inviscid and viscous *** water shocked to 15 GPa is taken as an example,the main results are as follows:(1) For inviscid and lower viscous flows the numerical method gives results in good agreement with the analytic solutions under the condition of small disturbance(a0/λ=0.02.;(2. For the flow of viscosity beyond 2.0 Pa s(η=κ) the analytic solution is found to overestimate obviously the effects of *** is attributed to the unreal pre-conditions of analytic solution by Miller and Ahrens;(3. The present numerical method provides an effective tool with more confidence to overcome the bottleneck of data treatment when the effects of higher viscosity in experiments of Sakharov and flyer impact are expected to be analyzed,because it can in principle simulate the development of shock waves in flows with larger disturbance amplitude,higher viscosity,and complicated initial flow.

关键词： viscosity coefficient two-dimensional Eulerian flow shock front sinusoidal disturbance

调制式旋转导向系统对井壁作用力的描述方法和变化规律

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石油学报 2004年第4期25卷 84-86,91页

作者：狄勤丰张小柯韩来聚孙铭新上海大学上海市应用数学和力学研究所上海200072 胜利石油管理局钻井工艺研究院山东东营257017

对调制式旋转导向工具RCLD系统的导向力的形成机理进行了探讨。结果表明 ,RCLD系统的导向力的形成方式与第一代PowerDrive系统相比有其独特的优势 ,是一种更为合理的方式。当单个伸缩块在控制面作顺时针和逆时针摆动时 ,每次伸出对井壁... 详细信息

对调制式旋转导向工具RCLD系统的导向力的形成机理进行了探讨。结果表明 ,RCLD系统的导向力的形成方式与第一代PowerDrive系统相比有其独特的优势 ,是一种更为合理的方式。当单个伸缩块在控制面作顺时针和逆时针摆动时 ,每次伸出对井壁施加的作用力均受到控制面摆动速度、高压阀孔圆心角、转盘转速的影响。

关键词：钻井旋转导向系统井壁导向力仿真计算井眼轨迹控制

LATTICE BOLTZMANN METHOD SIMULATIONS FOR MULTIPHASE FLUIDS WITH REDICH-KWONG EQUATION OF STATE

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Journal of Hydrodynamics 2011年第6期23卷 814-819页

作者： WEI Yi-kun QIAN Yue-hong Shanghai institute of applied Mathematics and {2. Shanghai University Shanghai 200072 ShanghaiChina

In this article we state that the compression factor of the Redlich-Kwong Equation Of State （EOS） is smaller than that of van der Waals EOS. The Redlich-Kwong EOS is in better agreement with experimental data on coexistence curves at the critical point than the van der Waals EOS. We implement the Redlich-Kwong EOS in the Lattice Boltzmann Method （LBM） simulations via a pseudo-potential approach. We propose a new force, which can obtain computational stationary and reach larger density ratio. As a result, multi-phase flows with large density ratio （up to 1012.in the stationary case） can be simulated. We perform four numerical simulations, which are respectively related to single liquid droplet, vapor-liquid separation, surface tension and liquid coalescence of two droplets.

关键词： Redlich-Kwong equation of state lattice Bhatager-Gross-Krook models numerical simulations phase transition

SIMULATION OF LAGRANGIAN DISPERSION USING A LAGRANGIAN STOCHASTIC MODEL AND DNS IN A TURBULENT CHANNEL FLOW

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Journal of Hydrodynamics 2009年第6期21卷 767-773页

作者： LUO Jian-ping LU Zhi-ming LIU Yu-lu School of Mechanical and Automation Engineering Shanghai Institute of Technology Shanghai 200235 China Shanghai institute of applied Mathematics and {2. Shanghai University Shanghai 200072 China

The mean square displacements of fluid particles in a turbulent channel flow at Reτ = 100 are investigated using a modified Langevin equation, and are compared with DNS results. Both the Lagrangian integral time scales directly obtained from DNS and the predicted values using an empirical relation between the Eulerian and the Lagrangian integral time scales are used in the modified Langevin equation to test the effects of integral time scales on the dispersion of particles. The results show that the slight variation of the Lagrangian integral time scale has little influence on the dispersion. The agreement between results of the model equation and those of DNS is satisfactory except the streamwise dispersion for intermediate times （ 2. 〈 t^＋〈 3.0 ）, where the results of the model equation are slightly overestimated compared to those of DNS. The cause of such discrepancy is discussed.

关键词： turbulent channel flow Lagrangian dispersion Lagrangian stochastic model

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考虑生化刺激的细胞分裂的力学模型

生物工程学报 2004年第5期20卷 754-758页

作者：安美文吴文周陈维毅曲华滕维中太原理工大学应用力学研究所太原030024

为了解释动物细胞胞质分裂的力学机理 ,基于大量的细胞卵裂实验数据 ,在Zinemanas和Nir的流体动力学模型基础上 ,对微丝的局部集中函数改为随同质膜移动 ,增加了由于生化刺激引起主动微丝的影响系数。数值计算表明 :此模型能较好的预测... 详细信息

为了解释动物细胞胞质分裂的力学机理 ,基于大量的细胞卵裂实验数据 ,在Zinemanas和Nir的流体动力学模型基础上 ,对微丝的局部集中函数改为随同质膜移动 ,增加了由于生化刺激引起主动微丝的影响系数。数值计算表明 :此模型能较好的预测细胞在胞质分裂过程中 ,细胞的总体和局部变形 ,以及卵裂沟处的张力和细胞内压。

关键词：主动微丝胞质分裂收缩环张力细胞

Simulation of Lagrangian dispersion using a Lagrangian stochastic model and DNS in a turbulent channel flow

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Simulation of Lagrangian dispersion using a Lagrangian stoch...