影响通讯产品质量的五个要素及其组合关系

分析业界的最佳实践,从产品质量的视角,解构五个要素(交付件形态、开发团队结构、开发过程模型、质量标准标准、工程技术等)对产品质量的影响关系,并列出业界典型应用中五个要素的组合.     

Point estimates for variance-structure parameters in Bayesian analysis of hierarchical models

Markov chain Monte Carlo (MCMC) made Bayesian analysis feasible for hierarchical models, but the literature about their variance parameters is sparse. This is particularly so for point estimators of variance-structure parameters, which are useful for simplifying tables and sample-size calculations, and as “plug-in” estimators in complex calculations. This paper uses simulation experiments to compare three such point estimators, the posterior mode, median, and mean, for three parameterizations of the variance structure, as precisions, standard deviations, and variances. We first consider simple linear regression, where fairly explicit expressions are possible, and then three more complex models: crossed random effects, smoothed analysis of variance (SANOVA), and the conditional autoregressive (CAR) model with two classes of neighbor relations. We illustrate the latter results using periodontal data. The posterior mean often performs poorly in terms of bias and mean-squared error, and should be avoided. The posterior median never performs worse than the mean and often performs far better. The surprise is that, on the whole, the posterior mode performs best regardless of the variance structure's parameterization, although the potential for multi-modality may make it unattractive for general use.     

微量硫色谱分析探索

对ＷＬＳＰ微量硫分析仪测定化工原料气、各种微量形态硫中出现的结果偏差，标准曲线的标定充的响应方程进行了系统分析，并提出了使用中的改进意见及措施。     

IEEE1394传输原理

IEEE1394作为多媒体应用的接口，前途无量，本文对其传输标准、数据标准和传输机制矛以介绍和分析．     

GPS数据采集系统

本文介绍基于GPS原理的数据采集系统及数据压缩存储格式．     

"标准比例分配法"在成本会计中的应用

成本核算当中,间接费用能否做到科学、合理地分配,选择合理的分配标准是关键.“标准比例分配法“在间接费用的分配中得到广泛应用,本文就常见的间接费用分配,做了详尽的介绍.     

包装标准与法规课程教学内容与教学方法的研究

针对包装标准与法规课程的性质与特点，研究了课程的教学内容，从6个方面对包装标准与法规课程的教学方法进行了尝试性实践，并提出了自己的见解和主张。     

Application of Genetic Algorithms in Texture Analysis and Optimization

The genetic algorithms method (GAM) is a modern computer technique based on some ideas taken from biological evolution theory. The GAM is especially useful in a study of problems being not completely determined. They are, e.g., problems having a few but not very different solutions or problems without a strict (exact) solution. The last situation may occur if it is enough to find a good enough solution but not necessarily the best one. In GAM approach, it is not necessary to know a priori a general scheme of problem solution; however, it is important to have a procedure estimating the quality of a solution. This procedure is necessary to eliminate some solutions and to accept another ones. In the last years, GAM was applied with success in different areas of science (e.g., sociology, construction engineering, artificial intelligence and many others). The present authors have applied GAM in crystallographic texture analysis: the orientation distribution function (ODF) was calculated from a set of measured pole figures. The quality of obtained results was very good; however, the calculation time and memory space were relatively high. The main reason of this situation was the use of spherical harmonic function series for the ODF representation. An important simplification of the calculation scheme (and of calculation time and memory space) can be obtained if ODF is represented by a sum of a few Gauss-type functions. The quality of solutions in this new approach is still very correct. The above-mentioned improved GAM scheme was also used to find an optimal crystallographic texture that optimizes the elastic properties of material. By using this approach the Young modulus can be maximised or minimised along a given sample direction.     

氯化镧与丙氨酸配位反应的热化学研究

用新型的具有恒温环境的反应热量计 ,以溶解量热法分别测定了 2 5℃时 (LaCl·7H2 O 3Ala)和Al(Ala) 3 Cl3 ·3H2 O在 2mol·L-1HCl溶剂中的溶解焓。通过设计的热化学循环得到七水氯化镧与丙氨酸配位反应的反应焓ΔrHm=9 738kJ·mol-1,并计算出配合物La(Ala) 3 Cl3 ·3H2 O在 2 98 2K时的标准生成焓ΔfH0m=- 3713 8kJ·mol-1。