天然化合物Isopregomisin的全合成

以焦性没食子酸为原料，经甲醚化、克莱森重排、碘化氢加成和孚兹反应合成了天然化合物Isopregomisin。     

Analytical Algorithms for the Blend Ratios by Fibre-bundle Tensile Curves Part I. Typical Tensile Curve and the Strength and Work Methods

The blend ratio and tensile properties are vital important characteristics of blended fibre bundles. Fibre-bundle tensile behaviour has been measured by means of the Sirolan-Tensor in order to derive a typical specific stress - extension curve. According to the typical tensile curve, the relationships between the blend ratio and the tensile parameters are discussed and established. Two new algorithms, so-called the strength method and the work method, have been developed for the blend-ratio estimation of blended fibre bundles. The relevant blend-ratios and calculations of the two methods are defined in detail. Also, the characteristics have been explained for every calculation and compared to each others. The experimental results show that the blend ratios estimated from the theoretical methods are high coincidence with the measured results. Meanwhile, the specific stress -- extension curve of blended fibre bundles depends directly on the blend ratios of the fibre bundles,     

哭泣的骆驼

著名环保志愿者包钢退休工人卢彤景,从1995年起六进阿拉善地区拍摄了数万张生态警示的照片,记录了阿拉善地区日益恶化的生态环境。旨在“我看到了,我要让看不到的你也看到”——没有草吃处于掉毛脱皮死亡进行时的骆驼,穿着花衣服的羊、沙进人退的村庄、死不瞑目的骆驼母子……     

Measuring Fiber Orientation in Nonwoven Fabrics by Laser Scattering Method Part Ⅱ: Algorithm and Verification

The algorithm for evaluation of fiber orientation distribution function (ODF) by laser scattering method based on 2 - dimentional model of fiber arrangement and the method of determining diffuse scattering intensity are presented. The fiber ODFs of nonwoven samples measured by the computer-program-controlled laser scattering intensity testing system are compared with that of the data obtained by microprojector method. The results show that the algorithm is feasible for assessing the fiber ODFs of nonwoven fabrics manufactured by different processing methods.     

Measuring Fiber Orientation in Nonwoven Fabrics by Laser Scattering Method Part II: Algorithm and Verification

The algorithm for evaluation of fiber orientation distribution function (ODF) by laser scattering method based on 2 - dimentional model of fiber arrangement and the method of determining diffuse scattering intensity are presented. The fiber ODFs of nonwoven samples measured by the computer- program-centrolled laser scattering intensity testing system are compared with that of the data obtained by microprojector method The results show that the algorithm is feasible for assessig the fiber ODFs of nonwoven fabrics manufactured by different processing methods.     

Study of adaptive finite element techniques for contact problem in elastic bodies

The adaptive element techniques of contact problem are studied by means of penalty method, and the error estimators are discussed. Based on error estimators, algorithm of the adaptive element techniques is developed, then the Gauss - Newton iterations are used which allow the nonlinear problem to be transformed into a sequence of linear sub- problems then easily solved. In addition, the algorithm can be applied into the simulation of de -bonding of fiber - reinforced composites.     

用经典力学计算氢分子的键长键能及力常数

氢原子中1 s电子的电子云呈球形，电子的最大几率密度分布出现在玻尔半径a0的球壳内，认为几率密度分布及电子云属统计规律，意味着已经使用了宏观时标，这样就使氢分子体系中能量和时间的作用量远大于普郎克常数；根据电子云的交叠，用经典力学计算了基态氢分子的结构常数，获得键长、键能及力常数的表达式分别为采用原子单位（a.u.）时z、e及a0均为1，获得Re=1.414a.u.，De=0.177a.u.，k=0.354a.u.，这些数值与实验值的相对误差分别<1%，<2%和<4%；成键模型直观，物理意义明确，计算中不含任何人为性参数。     

Monte-Carlo Simulation on the Failure of Fiber in a Single Filament Composite

A Monte-Carlo method is used to simulate gradual fracture of fiber in a single filament composite with the increase of virtual stress. A simple computational algorithm is developed to judge where breaking point will happen in the composite and a probability model based on Weibull-distribution is designed to calculate the average fragment length by producing stable and uniform random number in (0,1) . Compared to the published experiment results, the simulating average fragment length is quite perfect.     

爆炸加载下岩石的动态特性研究

以平面波发生器为加载源的爆炸测试系统，直接得出爆炸作用下岩石的应变历程曲线。通过对一组应变波形的Lagrange分析，指出岩石的动态特性参数值以及应变率是引起发生变化的主要原因。     

一种新型的具有电子传输性的苝衍生物的合成和性质研究

设计并合成了一系列苝衍生物.利用1HNMR、FT-IR确认了其分子结构.并分别做了热力学、能带结构以及晶体结构研究,发现其具有良好的溶解性,没有液晶性,属于单斜晶系,适合做电子传输材料.