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A Lattice Boltzmann Boundary Condition at Impermeable Boundaries

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Chinese Physics Letters 1997年第12期14卷 912-915页

作者： fang hai-ping LIN Zhi-fang TAO Rui-bao T.D.lee physics laboratory and department of physics fudan universityshanghai 200433

A hydrodynamic boundary condition for the lattice Boltzmann model at impermeable boundaries is *** boundary condition satisfies both the no-slip condition and the fluid conservation at boundary *** flow and Couette fl... 详细信息

关键词： boundary flow satis

Interaction between a Functionalized Single-Walled Carbon Nanotube and the YAP65WW Protein Domain: a Molecular Dynamics Simulation Study

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Chinese Physics Letters 2012年第6期29卷 287-290页

作者： DOU Quan-Tao ZUO Guang-Hong fang hai-ping T-Life Research Center Department of PhysicsFudan UniversityShanghai 200433 Shanghai Institute of Applied Physics Chinese Academy of SciencesP.O.Box 800-204Shanghai 201800

The interaction between a functionalized single-wailed carbon nanotube (f-SWCNT) and the YAP65WW protein domain is investigated by using molecular dynamics *** is found that the f-SWCNT binds onto the active site of the YAP65WW domain and leads to a substantial conformational change of the protein domain,which may securely affect the original function of *** the hydrophobic interaction and the long lifetime hydrogen bonds play important roles in the binding.

关键词： interaction lifetime Molecular

Peptide friction in water nanofilm on mica surface

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Chinese Physics B 2012年第2期21卷 431-436页

作者： Zhou Bo Xiu Peng Wang Chun-Lei fang hai-ping Department of Physical Biology and Department of Microscopic Water Dynamics Shanghai Institute of Applied PhysicsChinese Academy of SciencesP.O.Box 800-204Shanghai 201800China Graduate School of the Chinese Academy of Sciences Beijing 100190China Bio-X Laboratory Department of PhysicsZhejiang UniversityHangzhou 310027China Theoretical Physics Center for Science Facilities Chinese Academy of Sciences19(B)Yuquan RoadBeijing 100049China

Peptide frictions in water nanofilms of various thicknesses on a mica surface are studied via molecular dynamics simulations. We find that the forced lateral motion of the peptide exhibits stick-slip behaviour at low water coverage; in contrast, the smooth gliding motion is observed at higher water coverage. The adsorbed peptide can form direct peptide-surface hydrogen bonds as well as indirect peptide-water-surface hydrogen bonds with the substrate. We propose that the stick-slip phenomenon is attributed to the overall effects of direct and indirect hydrogen bonds formed between the surface and the peptide.

关键词： peptide friction water nanofilm mica surface molecular dynamics simulation

Local Compression Properties of Double-Stranded DNA Based on a Dynamic Simulation

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Chinese Physics Letters 2013年第12期30卷 186-190页

作者： LEI Xiao-Ling QI Wen-Peng fang hai-ping Division of Interfacial Water Shanghai Institute of Applied PhysicsChinese Academy of SciencesP.O.Box 800-204Shanghai 201800

Using a simple sphere-tip compression system,the local radial mechanical properties of DNA are systematically studied by changing the tip *** the tip size decreases,the radial compression elastic properties under external loads become sensitive to the tip size and the local DNA conformation.A sudden force break appears in the compression-force curve when the tip size is less than or equal to 12 nm in *** analysis of the hydrogen bonds and the base stacking interaction shows that a local unwinding process *** the compression process,firstly the hydrogen bonds between complement base pairs are *** the compression accumulating,the local backbones in the compression center are unwound from the double helix conformation to a kind of parallel *** local unwinding behavior deduced by external loads is helpful to understand the biological process and is important to DNA-based nanomechanical devices.

关键词： winding base process

SLIP VELOCITY MODEL OF POROUS WALLS ABSORBED BY HYDROPHOBIC NANOPARTICLES SIO_2

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Journal of Hydrodynamics 2007年第3期19卷 365-371页

作者： GU Chun-yuan DI Qin-feng fang hai-ping Shanghai Institute of-Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Institute of Applied Physics Chinese Academy of Scinese Shanghai 201800 China

According to new slip effects on nanopatterned interfaces, the mechanism of enhancing water injection into hydrophobic nanomaterial SiO2 was proposed. When Hydrophobic Nanoparticles（HNPs）are adsorbed on surfaces of porous walls, hydrophobic nanoparticles layers are formed instead of hydrated layer, and slip effects appear on the pore wall when a driving pressure is applied to the rock cores sample. It makes fluid to move more quickly and the flow capacity increases greatly. Experiments on changing wettability of porous walls were conducted, and the phenomenon that porous walls surfaces were adsorbed by nanoparticles was validated with the Environment Scan Electron Microscopy（ESEM）. The results of displacement experiments show that flowing resistance is greatly reduced, and water-phase effective permeability is increased by 47 % averagely after being treated by nanofluid. These results indicate that the slip effect may occur on nanoparticle film of porous walls. Based on this new mechanism of enhancing water injection about hydrophobic nanomaterial SiO2, a slip velocity model in uniform porous media was introduced, and some formulas for the ratio of slip length to radius, slip length ,stream slip velocity and flux increment were deduced. and calculated results indicate that the ratio of slip length to radius is about 3.54%-6.97%, and the slip length is about 0.024 μ m -0.063 μ m. The proposed model can give a good interpretation for the mechanisms of enhancing water injection with the HNPs.

关键词： hydrophobic nanomaterial SiO2 mechanism of enhancing water injection velocity slip model core displacement experiments adsorption wettability

Dynamic Effect of Rolling Massage on Blood Flow

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Communications in Theoretical Physics 2009年第2期51卷 331-334页

作者： CHEN Yan-Yan YI Hou-Hui LI Hua-Bing fang hai-ping Shanghai Institute of Applied Physics Chinese Academy of Sciences P.O. Box 800-204 Shanghai 201800 China College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321004 China Department of Physics and Electronic Science Binzhou University Shandong 256600 China Department of Information Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China Graduate School of the Chinese Academy of Sciences Beijing 100080 China Theoretical Physics Center for Science Facilities （TPCSF） CAS 19（B） Yuquan Road Beijing 100049 China

The Chinese traditional medical massage has been used as a natural therapy to eliminate some diseases. Here, the effect of the rolling massage frequency to the blood flow in the blood vessels under the rolling massage manipulation is studied by the lattice Boltzmann simulation. The simulation results show that when the frequency is smaller than or comparable to the pulsatile frequency of the blood flow, the effect on the blood flux by the rolling massage is small. 011 the contrast, if the frequency is twice or more times of the pulsatile frequency of the blood flow, the blood flux is greatly enhanced and increases linearly with respect to the frequency. Similar behavior has also been observed on the shear stress on the blood vessel walls. The result is helpful for understanding that the rolling massage has the function of promoting the blood circulation and removing the blood stasis.

关键词： rolling manipulation moving stenosed vessel wall shear stress LBM

DIFFUSING OF AN AMMONIA MOLECULE IN WATER IN A VERY SHORT TIME PERIOD

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Journal of Hydrodynamics 2012年第6期24卷 969-970页

作者： SHENG Nan TU Yu-song GUO Pan WAN Rong-zheng fang hai-ping Shanghai Institute of Applied Physics Chinese Academy of Science University of the Chinese Academy of Sciences Institute of Systems Biology Shanghai University

The diffusion of an ammonia molecule （NH3） in water was investigated by molecular dynamic simulations. It is found that the diffusion shows negative correlation with its dipole orientation.

关键词： diffusion ammonia correlation

Lateral Migration and Nonuniform Rotation of Biconcave Particle Suspended inPoiseuille Flow

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Chinese Physics Letters 2013年第6期30卷 114-117页

作者： WEN Bing-hai CHEN Yan-Yan ZHANG Ren-Liang ZHANG Chao-Ying fang hai-ping Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800 University of Chinese Academy of Sciences Beijing 100049 College of Computer Science and Information Engineering Guangxi Normal UniversityGuilin 541004 Department of Physics Zhejiang Normal UniversityJinhua 321004

A biconcave particle suspended in a Poiseuille flow is investigated by the multiple-relaxation-time lattice Boltzmann method with the Galilean-invariant momentum exchange *** lateral migration and equilibrium of the particle are similar to the Segré-Silberberg effect in our numerical ***,two lateral equilibrium positions are observed corresponding to the releasing positions of the biconcave *** upper equilibrium positions significantly decrease with the increasing Reynolds number,whereas the lower ones are almost insensitive to the Reynolds ***,the regular wave accompanied by nonuniform rotation is exhibited in the lateral movement of the biconcave *** can be attributed to the fact that the biconcave shape in various postures interacts with the parabolic velocity distribution of the Poiseuille flow.A set of contours illustrate the dynamic flow field when the biconcave particle has successive postures in a rotating period.

关键词： flow. concave positions

微观尺度下的水:从准一维、二维受限空间到生物以及材料表面

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物理学报 2016年第18期65卷 28-37页

作者：方海平中国科学院上海应用物理研究所中国科学院微观界面物理与探测重点实验室水科学与技术研究室上海201800

地球上的各种过程,包括物理、化学、环境和生物等,大多数与微观尺度下的界面水息息相关.界面水有大量悬而未决的基础科学问题,长期以来水都是重要的科学研究对象.本文通过从一维受限空间、二维表面以及生物大分子和材料表面上的水等角... 详细信息

地球上的各种过程,包括物理、化学、环境和生物等,大多数与微观尺度下的界面水息息相关.界面水有大量悬而未决的基础科学问题,长期以来水都是重要的科学研究对象.本文通过从一维受限空间、二维表面以及生物大分子和材料表面上的水等角度概述当前的一些研究进展,讨论与界面水相关的一些前沿问题,以及在界面水方面的基础研究和新技术的突破对于解决这些前沿问题的必要性.

关键词：界面水准一维和二维受限空间生物分子表面材料表面