各向异性功能梯度材料板反平面断裂问题的力学模型

借助弹性力学理论、断裂力学知识及微积分方法，讨论各向异性功能梯度材料裂纹板在沿z轴方向剪切栽荷作用下的反平面断裂问题。将材料常数（刚度系数）设为空间变量Y的任意函数，建立了各向异性功能梯度材料板的反平面断裂力学模型，即一类偏微分方程边值问题。再将材料常数依次设为空间变量Y的指数函数和幂函数，建立了相应的反平面断裂力学模型，即一系列偏微分方程边值问题。这些模型是研究有关各向异性功能梯度材料板反平面断裂问题的一个出发点和理论基础，具有一定的参考价值。     

BEM Analysis of Wave Propagation in a Water-Filled Borehole in an Anisotropic Solid

This paper describes a time-domain boundary element method developed to analyze the interactions of acoustic and elastic waves near the interfaces between water and an anisotropic elastic solid. Two models are analyzed with one being the interface between two half spaces of fluid and solid and the other being a fluid region sandwiched by half space domains of anisotropic elastic solids. Both monopole and dipole point sources are used to generate an initial pressure wave in the fluid. Some snapshots of the transient wave behavior near the fluid-solid interfaces are given. The effect of the anisotropy in the solid on the pressure waveforms in the fluid is discussed. The numerical results allow detailed arrival identification and interpretation of acoustic and elastic waves propagating along the fluid-solid interfaces.     

热动力学框架内的RPC材料弹塑性各向异性损伤本构建模研究

考虑材料刚度的退化,不可恢复应变,非弹性体胀及单边效应,建立了RPC材料的弹塑性各向异性损伤本构关系.采用有效应力张量的正负分解,拉压不同的塑性硬化法则和拉压不同的损伤演化法则对RPC材料的单边效应进行了建模.采用张量型的损伤变量来描述损伤的各向异性,通过四阶损伤效应张量和应变等效假设建立有效构形和损伤构形中的物理量之间的关系.在热动力学框架内,建立了RPC材料的状态势和耗散势,由状态律给出了与状态变量共轭的热动力学广义力与状态变量之间的关系,由动力律给出了状态变量的演化关系,由塑性加载条件,损伤准则和一致性条件给出了塑性乘子和损伤乘子的大小,最终推导出弹塑性损伤切线刚度张量,为数值方法的实施典定基础,讨论了材料参数确定的方法和模型的局限性,为进一步的工作指明了方向.     

广义各向异性流的渐近性态

对按曲线流γｔ＝Ｖ（θ，ｋ）Ｎ演化着的平面光滑简单闭凸曲线给出了１个等周估计．由此结合尺度论证法得到平面光滑简单闭凸曲线在上述曲线流下的渐近性态．     

基于斜交异性板单元的斜桥有限元分析

通过推导一种新型的斜桥分析单元──斜交异性板单元，实现了斜桥的空间有限元分析；通过与实用计算方法的对比，证明了这一方法的可靠性；最后，应用这一方法，结合工程实例介绍了斜桥影响面生成、影响面加载策略和斜桥的配筋计算在桥梁工程中的具体应用     

Preparation of Electrically Conductive Filler for Anisotropic Conductive Adhesive

Introduction As a competitive substitute of lead-containedsolder,ACAs appear a promising future due totheir numerous advantages,such as low-tempera-ture compatible assembly,higher packaging densi-ty,environmental friendliness,low-stress on thesubstrates.T…     

各向异性外问题的并行Schwarz算法及其收敛性

对于无界区域各向异性常系数椭圆型偏微分方程,研究了一种并行Schwarz算法。在常数权因子下通过L ions的投影解释证明了其收敛性,在变权因子下改进了并行Schwarz算法,并分析了其收敛性。     

Excitation energy transfer mechanisms in allophycocyanin (I)

The mechanisms of excitation energy transfer within allophycocyanin monomer with the theory of generalized master equation (GME) and the technique of time-resobed fluorescence anisotropic spectroscopy are studied. In the case of known information of its structure and spectra, the theory applied is based on the assumption that the coupling interaction between two chromophores is fairly weak. The theory correctly predicts the experimentlly observed rate for excitation energy transfer in allophycocyanin monomer. Based on the results, the energy transfer mechanism can be described as Förster and these processes cannot take place from the high vibrational levels of donor to acceptor.     

金属薄板各向异性行为的理论模拟

利用Ｂ－Ｌ［５］和Ｈｉｌ（１９４８）［２］屈服函数，对薄板的各向异性行为进行了理论研究．结果表明：Ｂ－Ｌ函数［５］比Ｈｉｌ（１９４８）［２］函数更能反映材料变形的各向异性行为．当屈服函数的Ｍ值取７～１２时，Ｂ－Ｌ函数的使用效果更佳     

各向异性吸波材料对电磁波的反射

由麦克斯韦方程出发导出了各向异性吸波材料的反射系数公式;通过理论分析讨论了各向异性吸波材料对电磁波的反射特性;由各向异性吸波材料的反射系数公式可导出各向同性吸波材料的反射系数公式．