Ⅲ型界面裂纹的非对称动态扩展问题

采用复变函数论的方法,对Ⅲ型界面裂纹的非对称动态扩展问题进行了研究．通过自相似函数的方法可以获得解析解的一般表达式．应用该法可以迅速地将所论问题转化为Riemann-Hilbert问题,并求得了非对称扩展裂纹分别在集中载荷、阶跃载荷作用下的解析解．利用这些解并采用叠加原理,就可以求得任意复杂问题的解．     

A cellular automata model with probability infection and spatial dispersion

In this article, we have proposed an epidemic model based on the probability cellular automata theory. The essential mathematical features are analysed with the help of stability theory. We have given an alternative modelling approach for the spatiotemporal system which is more realistic from the practical point of view. A discrete and spatiotemporal approach is shown by using cellular automata theory. It is interesting to note that both the size of the endemic equilibrium and the density of the individuals increase with the increase of the neighbourhood size and infection rate, but the infections decrease with the increase of the recovery rate. The stability of the system around the positive interior equilibrium has been shown by using a suitable Lyapunov function. Finally, experimental data simulation for SARS disease in China in 2003 and a brief discussion are given.     

纳米TiO2的有机酸改性

纳米TiO2粉体独特的光催化作用、颜色效应以及紫外屏蔽等功能使其在汽车工业、防晒化妆品、环保等方面有着广阔的应用前景。未经表面处理的纳米TiO2表面疏油,不易在有机介质中分散,直接影响到TiO2性能的发挥。     

(2,2-双二茂铁基丙烷)-6-甲酸酯的合成与表征

以2,2-双二茂铁基丙烷作为母体制得对应的甲酸,并以此合成了一系列未见文献报道的（2,2-双二茂铁基丙烷）-6．甲酸酯,其结构经1^H NMR,IR及元素分析表征。     

层状介质中受冲击载荷的裂纹问题

本文对由不同正交异性材料组成的层状结构中受冲击载荷的Ⅲ型裂纹动力学问题给出了解的一般表示。文中利用结合面的边界条件,将问题中所有各量用单一未知函数表示,用积分变换方法将受冲击力作用问题化为对偶积分方程,并用Copson方法给出了解。本文方法也可以应用到裂纹表面受任意动载荷的情况。     

基于席夫碱配体的Gd(Ⅲ)/Dy(Ⅲ)配合物的结构和磁性（英文）

以席夫碱2-羟基-3-甲氧基-5-溴苯甲醛肟(HL)为配体,合成了2例未见文献报道的席夫碱-稀土双核配合物[Gd_2(L)_4(HCOO)_2(CH_3OH)_2](1)和[Dy_2(L)_4(CH_3COO)_2(CH_3OH)_2](2)。X射线单晶衍射分析表明配合物1和2中镧系金属均为对称的九配位双核结构。对配合物的磁性测试结果表明配合物1中双核Gd(Ⅲ)离子之间存在着弱的反铁磁相互作用,交流磁化率测试结果表明,配合物2显示出频率依赖。     

新老混凝土结合面抗剪性能试验研究

新老混凝土结合面是加固结构中最脆弱的部位,新老混凝土能否正常工作主要取决于结合面的抗剪强度。通过模型试验对结合面抗剪性能进行了研究。模型采用Z型试件,分为凿毛不植筋和既凿毛又植筋两种。对比试验结果表明,植筋能大大改善结合面的抗剪性,且大幅度提升新结构的承载力,是一种有效的加固处理方法。数值仿真结果与试验结果比较表明,结合面加固处理的模拟能在一定程度上反映实际情况中结合面的力学性能。     

光电倍增管渡越时间的测量

响应时间为10-9 s的LED灯作为光源,使用MCP-PM T测量系统的固有时间特性,用示波器记录波形并获取时间差,实验测量了俄罗斯CHФ型光电倍增管的渡越时间。     

DYNAMIC CRACK MODELS ON PROBLEM OF BRIDGING FIBER PULL-OUT OF COMPOSITE MATERIALS

An elastic analysis of an internal central crack with bridging fibers parallel to the free surface in an infinite orthotropic anisotropic elastic plane was performed. A dynamic model of bridging fiber pull-out of composite materials was presented. Resultingly the fiber failure is governed by maximum tensile stress, the fiber breaks and hence the crack extension should occur in self-similar fashion. By the methods of complex functions, the problem studied can be transformed into the dynamic model to the Reimann-Hilbert mixed boundary value problem, and a straightforward and easy analytical solution is presented. Analytical study on the crack propagation subjected to a ladder load and an instantaneous pulse loading is obtained respectively for orthotropic anisotropic body. By utilizing the solution, the concrete solutions of this model are attained by ways of superposition.     

3D打印在分析化学中的应用研究

3D打印是一种以计算机三维设计数字模型文件为基础,运用特殊可粘合材料,借助光固化和纸层叠等方式逐层打印的,一种快速成形构造物体的新技术.本文侧重从色谱仪器分析、电化学仪器分析、原子分子光谱和质谱仪器分析等方面评论了近年来3D打印在分析化学中的应用研究,为现代仪器分析研究提供借鉴参考,以使3D打印技术和分析化学学科交叉融合协同发展.