Specimen preparation and image processing and analysis techniques for automated quantification of concrete microcracks and voids

Specimen preparation and image processing/analysis techniques were developed for use in automated quantitative microstructural investigation of concrete, focusing on concrete microcracks and voids. Different specimen preparation techniques were developed for use in fluorescent and scanning electron microscopy (SEM) of concrete; then techniques produce a sharp contrast between microcracks/voids and the body of concrete. The image processing/analysis techniques developed specifically for use with concrete address the following usages: automatic threshold; development of intersecting microcracks/voids and connected voids; distinction of microcracks form voids based on geometric attributes; and noise filtration.     

ANOM在质量控制中的应用

ANOM（均值分析）是一种有效的质量工具，可以用来分析实验因素对输出的影响是否显著。可以应用于单因子，双因子的实验设计，无论是计量值数据，还是计数值数据，ANOM检验异常值的能力都很强，介绍了ANOM的基本分析过程，对ANOM和ANOVA进行了检验异常值灵敏度大小的比较，同时给出了实例。     

略论贵州省化工企业职业教育的发展

从目前市场需求和就业率出发，进行形势分析，提出优化专业设置、加强实践环节、提高高职学院办学层次、推进“双证书”制度等改革方法，以促进化工职业教育的发展。     

Two methods for sensitivity analysis of coagulation processes in population balances by a Monte Carlo method

We consider two stochastic simulation algorithms for the calculation of parametric derivatives of solutions of a population balance equation, namely, forward and adjoint sensitivity methods. The dispersed system is approximated by an N-particle stochastic weighted ensemble. The infinitesimal deviations of the solution are accounted for through infinitesimal deviation of the statistical weights that are recalculated at each coagulation. In the forward method these deviations of the statistical weights immediately give parametric derivatives of the solution. In the second method the deviations of the statistical weights are used to calculate a finite-mode approximation of the linearized version of the population balance equation. The linearized equation allows for the calculation of the eigenmodes and eigenvalues of the process, while the parametric derivatives of the solution are given by a Lagrange formalism.     

Microstress estimate of stochastically heterogeneous structures by the functional perturbation method: A one dimensional example

A new functional perturbation method (FPM) for calculating the probabilistic response of stochastically heterogeneous, linear elastic structures is developed. The method is based on treating the governing differential operator as well as the unknown displacement function as a functional of material modulus field. By executing a functional perturbation around the homogeneous case, a set of successive differential equations is obtained and solved, from which the average and variance of any local parameter (displacements, stresses, strains) can be found. For a linear problem, the equations to be solved in each approximation order differ from the one for the homogeneous case by a pseudo external loading (right hand side) part only. Thus, only the Green function for the homogeneous case is needed for an analytical solution of the corresponding heterogeneous problem. A one dimensional stochastically heterogeneous rod embedded in a uniform shear resistant elastic medium is solved as an example. The statistical variance of displacements and stresses are found analytically, including the edge regions. Morphological (grain size) and material (modulus) effects on the stochastic response are demonstrated. The above results are essential for estimating the stochastic features of local stress concentrations, which are the source for many strength-related macro properties of materials. Extensive usage of generalized functions (Dirac operator and its derivatives) is needed for the analysis.     

基于AHP—DEA模型的鱼雷方案评价研究

将层次分析法（AHP）与数据包络法（DEA）有机结合，构建了AHP—DEA的鱼雷方案评价模型，首先通过AHP法计算各鱼雷方案在评价因素中的相对权重，然后根据DEA法的原理将鱼雷方案作为决策单元、各方案的相对权重作为产出建立优化模型，通过计算模型的相对效率值，求出鱼雷方案可能性大小的顺序，并以实例阐述该模型在鱼雷方案评价中的具体运用。     

建新矿采空区自然发火测温实践

通过介绍测温法在建新矿自然发火规律研究中的实践运用,进一步摸索采煤工作面推进过程中采空区后方的温度变化规律,为矿井采取有效的防自然发火措施提供科学依据.     

砌筑砂浆达不到设计要求的事故原因分析

从砂浆的配合比、和易性、原材料等对砌筑砂浆达不到设计要求的事故原因进行了分析。     

空气井测井响应现象分析与探讨

空气钻井作为一种新的钻井技术已在四川油田川东地区的zbl井首次投入使用。2003年2月1日，四川测井公司数控分公司对该井进行了测井施工作业，采集了合格的井径、自然伽马、补偿声波、补偿中子、补偿密度和深浅双侧向资料。针对空气井测井中出现的现象进行了分析与探讨，旨在为今后空气井测井系列的选择与解释奠定基础。