超导体/正常金属/半导体/正常金属/超导体结的研究

在约瑟夫逊效应的理论研究中,大体上有微观和宏观两种方法。采用的是宏观的方法。利用推广的Ja-cobson方法,讨论了超导体/正常金属/半导体/正常金属/超导体结的约瑟夫逊效应,并在小电流假设下,推导出了该结的电流密度与位相之间的关系。     

Differential transport and dispersion of colloids relative to solutes in single fractures

This work employed numerical experiments simulating colloid and solute transport in single parallel-plate fractures, using the random walk particle tracking method, to demonstrate that (1) there exists an aspect ratio of the colloid radius to half the fracture aperture, δ_o, where the average velocities of colloids and solutes are similar. When δ > δ_o, the velocity distribution assumption is satisfied, and the fact that the ratio of the colloid transport velocity to the solute transport velocity, τ_p, decreases as δ increases is well documented in the literature. However, when δ < δ_o, the velocity distribution assumption is violated, and τ_p increases as δ increases and (2) the Taylor dispersion coefficient and its extension by James and Chrysikopoulos [S.C. James, C. V. Chrysikopoulos, J. Colloid Interface Sci. 263 (2003) 288] will overestimate the colloid dispersion coefficient significantly. Additionally, numerical experiments simulating colloid and solute transport in variable-aperture fractures demonstrated that τ_p and D_L,coll/D_L,solute decrease with increasing CoV, and the anisotropy ratio only plays a minor role compared to the CoV. These observations have important implications towards the interpretation of colloid transport in both porous and fractured media.     

向量优化中改进集的一些拓扑性质

主要研究改进集的一些拓扑运算性质。首先在改进集条件下给出了拓扑向量空间中两个非空集之和的拓扑内部的一些运算性质。进一步,利用改进集获得了 Flores-Baz′an 和 Hern′andez 提出的假定 B 的一个加强形式。此外,给出了一些例子对主要结果进行了解释。     

二阶问题Adini元的误差估计(英文)

The main aim of this paper is to have an accurate analysis on the famous Adini's element for the second order problems under to the anisotropic meshes.We firstly show that the interpolation of Adini's element satisfy the anisotropic property.Then the optimal error estimate is obtained without the regularity assumption on the meshes.     

多肢墙的线性方程解

本文去掉了R.Rossman方法中连梁连续化这一基本假定,给出了一种更符合实际的解法,该方法可以直接处理多肢墙,进而解决了R.Rossman方法中弯矩分配系数的确定问题。     

THE FIRST ORDER APPROXIMATION OF NON-KIRCHHOFF-LOVE THEORYFOR ELASTIC CIRCULAR PLATE WITH FIXED BOUNDARY UNDERUNIFORM SURFACE LOADING (Ⅰ)

I.1ntroductionTheaxisymmetricproblemofthreedimensionalelasticcircularplatecanbetreatedasthreedimensionalaxisymmetricproblemofelasticity.Weconsideracircularplatewithauniformthicknessh,andsetupacircumferentialcoordinates(r,o)onitsmidd1esurfacewithabscissazp…     

滑坡支挡结构荷载取值问题研究

当前,在我国工程界,滑坡支挡结构上的荷载取值普遍以传递系数法的条间力(即剩余下滑力)为基础,本文对这种荷载取值方法存在的问题进行了分析,提出了以稳定性为基础确定滑坡支挡结构上荷载的方法,该方法能弥补现行荷载取值方法的不足。     

IUPAC-LDPE的流变性测试实验之间的相对滑动

以IUPAC—LDPE熔体在150℃下详细的流变学表征实验和毛细管挤出实验为基础考察了该熔体在挤出实验中的滑动问题．根据相对滑动特性给出了判断相对滑动存在和计算相对滑动速度的方法．用Wagner模型，PSM模型和Osaki模型计算的表观剪切速率，在10s^-1时的毛细管壁面剪切应力比毛细管挤出实验给出的应力值高出约15％-17％，这个结果意味着IUPAC—LDPE熔体在挤出实验中存在滑动现象．在表观剪切速率为0．1，1．0和10s^-1时，挤出实验条件下的流动与根据在旋转流变仪上测定的流变特性用PSM模型计算的流动相比，它们之间存在的相对滑动速度分别为0．004，0．071和1．343mm／s．用Wagner模型和Osaki模型计算的相对滑动速度与PSM模型的结果相近．     

On the canonical equations of Kirchhoff-Love theory of shells

The paper outlines a procedure to derive the canonical system of equations of the classical theory of thin shells using Reissner’s variational principle and partial variational principles. The Hamiltonian form of the Reissner functional is obtained using Lagrange multipliers to include the kinematical conditions that follow from the Kirchhoff-Love hypotheses. It is shown that the canonical system of equations can be represented in three different forms: one conventional form (five equilibrium equations) and two forms that are equivalent to it. This can be proved by reducing them to the same system of three equations. For problems with separable active and passive variables, partial variational principles are formulated __________ Translated from Prikladnaya Mekhanika, Vol. 43, No. 10, pp. 99–107, October 2007.