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Phase Transition for Dielectric Breakdown Model

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Communications in Nonlinear Science and Numerical Simulation 1997年第4期2卷 201-206页

作者： Fuxuan CHANG &Houqiang LI &De L IU &L ibin L IN (Department of Physics. Open laboratory of Radiation Physics and Technology,Sichuan University,Chengdu,6 1 0 0 6 4,China) 1The paper was received on Nov. 2 0 ,1997 Department of Physics Open laboratory of Radiation Physics and Technology Sichuan University Chengdu 610064 China

In this paper,the phase transition for DBM whenηvaries is investigated by using real- space renormalization-group method. The resultdemonstrates that there are phase transitions for almost all the value ofη,and we f... 详细信息

关键词： DBM phase transition renormalization-group

NONFERROUS METALS AND PLAIN BEARINGS

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中国有色金属学会会刊：英文版 1993年第4期3卷 72-79页

作者： Collyear,John The Institute of Materials,Walnut Tree House,Nether Westcote Oxon OX7 6SD England

The definition of a plain bearing is *** requirements for bearing materials are *** historical perspective and recent development of the bearing materials are intro-duced,and the performances of current bearing materi... 详细信息

关键词： nonferrous metals plain bearing performance recent development

Past, present and future of fuel cells

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电池 2002年第3期32卷 130-132页

作者： A.C.C.Tseung(School of Chemical and Life Sciences,University of Greenwich,London SE18 6PB,UK) School of Chemical and Life Sciences University of Greenwich 英国

Though the fuel cell was invented by Grove in 1839,there are no commercially viable products at *** development of fuel cells can be conveniently divided into three phases exploratory phase(1839-1967).The main emphasis of the work is to increase the area of the three phase interface at the *** problem was solved by Bacon who invented the dual porosity,biporous nickel *** demonstrated the first H 2/O 2 fuel cell(180℃,20atm).This cell was later improved and scaled up to power the Apollo lunar ***,the cost is too high for civilian applications and we come to the development phase (1967-2001).The main emphasis has been on the use of Teflon bonded electrodes and novel catalysts(PtRu,Pt/WO 3 and Pt Ru/WO 3 anode catalyst for the anodic oxidation of impure H 2 and *** addition,the recent discovery of gadolinium doped ceria has reduced the operating temperature of solid oxide electrolytes to ～500℃ instead of 1?000℃.From 2001 onwards,we may be entering the breakthrough phase where the most favourable candidates are direct methanol vapor fuel cells and solid oxide electrolyte fuel *** the former case,there is a need to reduce the cross over of methanol to the cathode compartment and the development of air cathode catalyst which are less affected by methanol and in the latter case,there is a need to improve the activity of the anode and cathode catalysts.

关键词：燃料电池电催化反应电解液电极

ON MAXIMUM NORM ESTIMATES FOR RITZ-VOLTERRAPROJECTION WITH APPLICATIONS TO SOME TIME DEPENDENT PROBLEMS

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Journal of Computational Mathematics 1997年第2期15卷 159-178页

作者： Y.P. Lin(Department of Mathematics University of Alberta Edmonton, Alberta T6G 2G1 Canada) Univerisity of Alberta Edmonton 加拿大

The stability in L∞-norm is considered for the Ritz-Volterra projection and some applications are presented in this paper. As a result, point-wise error estimates are established for the finite element approximation for the parabolic integrodifferential equation, Sobolev equations, and a diffusion equation with non-local boundary value problem.

关键词： Math ON MAXIMUM NORM ESTIMATES FOR RITZ-VOLTERRAPROJECTION WITH APPLICATIONS TO SOME TIME DEPENDENT PROBLEMS

Anomalous Diffusion on the Percolating Networks

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Communications in Nonlinear Science and Numerical Simulation 1997年第4期2卷 220-225页

作者： De L IU,Houqiang LI,Fuxuan CHANG &Libin L IN (Department of Physics &Open laboratory of Radiation Physics and technology,Sichuan Union university,Cheng Du,6 1 0 0 6 4,China) 1The paper was received on Dec.2 0 th.,1997 Department of Physics & Open laboratory of Radiation Physics and technology Sichuan Union university Chengdu 610064 China

According to the standard diffusion equation,by introducing reasonably into a anomalous diffusion coefficient,the generalized diffusion equation,which describes anomalous diffusion on the percolating networks with a power- law distribution of waiting times,is derived in this *** solution of the generalized diffusion equation is obtained by using the method,which is used by *** problems of anomalous diffusion on percolating networks with a power- law distribution of waiting times,which aren’tsolved by Barta,are resolved.

关键词： anomalous diffusion percolating networks the critical point a power- law distribution of waiting times

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长大

长大

2019年

作者： zhuzhu6p

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今日健康家庭美容健身健康文摘

今日健康家庭美容健身健康文摘

Effect of ^(125)I seeds and ^(103)Pd stents on proliferation of vascular smooth muscle cells

作者： 46-253 14-223 6-91

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Nuclear Science and Techniques 2002年第4期13卷 218-223页

作者： ZHU Jun, LUO Quan-Yong, ZHU Rui-Sen, LU Han-Kui (Shanghai 6th People’s Hospital, Shanghai 200233) Shanghai 6th People's Hospital 200233

This study aims at the theoretical and practical evidence for prevention of restenosis in *** smooth muscle cell(VSMC)model was established using adherent cell culture *** proliferation of VSMC was investigated by the cell counting method and 3H-TDR implementation *** results are as follows.(1) For ^125I-seeds,the inhibition rate was 29.3% at 74B1(P<0.05),35.2% at 148Bq(P<0.05)and 42.4% at 370Bq(P<0.05),For ^103Pd-implanted stents,the inhibition rate was 14.7% at 4.44MBq(P<0.05),24.0% at 5.92MBq(P<0.05) and 38.0%at 7.4MBq(p<0.05),There was no significant difference between the blank tests and non-radioactive tests.(2) 48 hours exposure from ^125I-seeds at 148Bq or ^103Pd-implanted stents at 7.4MBq did not result in VSMC's morphological alteration,but that from ^125I-seeds at 370Bq caused morphological changes,Both ^125I-seeds and ^103Pd0-implanted stents inhibit the VSMC DNA synthesis in *** inhibition effects are significantly related to their exposure duration and doses.

关键词：细胞增殖 125I 103Pd 血管肌肉细胞

Simple geometrical explanation of Gurtin-Murdoch model of surface elasticity with clarification of its related versions

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Science China(Physics,Mechanics & Astronomy) 2010年第3期53卷 536-544页

作者： Ru C. Q. Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8 1. Department of Mechanical Engineering University of Alberta Edmonton Alberta Canada T6G 2G8

It is showed that all equations of the linearized Gurtin-Murdoch model of surface elasticity can be derived, in a straightforward way, from a simple second-order expression for the ratio of deformed surface area to initial surface area. This elementary derivation offers a simple explanation for all unique features of the model and its simplified/modified versions, and helps to clarify some misunderstandings of the model already occurring in the literature. Finally, it is demonstrated that, because the Gurtin-Murdoch model is based on a hybrid formulation combining linearized deformation of bulk material with 2nd-order finite deformation of the surface, caution is needed when the original form of this model is applied to bending deformation of thin-walled elastic structures with surface stress.

关键词： surface elasticity surface stress Gurtin-Murdoch model