基于正交试验法的GH4169高速铣削表面粗糙度研究

对镍基合金GH4169试件高速铣削加工表面粗糙度进行了正交试验,运用极差分析法得出4个试验因素对表面粗糙度影响程度的不同,绘制了铣削参数对表面粗糙度的影响趋势曲线,并对其影响原因进行了分析。     

Optimal Layout of Displacement Measurements for Parameter Identification Process in Geomechanics

This paper focuses on designing the optimal layout of measurements for parameter identification problems in geomechanics, which are usually based on in situ displacements. The existence, uniqueness, and stability of the solution from the parameter identification process are thoroughly discussed. Based on these understandings of the problem, two algorithms are proposed as a means of automatically generating the optimal measurements. The validity of these algorithms is first proved by some academic examples, then these algorithms are applied to the Munich subway tunnel project. Good results are observed there.     

雨水利用与水量平衡分析在城市园区水景设计中的应用

城市园区水景的水量保障问题对于水景观的建设与运行至关重要,收集雨水资源作为景观用水技术可行、运行经济、符合当前的节水形势。在水景观的设计过程中应用水量平衡分析可以将雨水利用与水景建设统筹考虑,指导水景方案的规划设计,寻求合理的水景规模、高效的水资源利用率,降低水景项目的建设投资与运行费用。将雨水利用和水量平衡分析运用于水景设计中,有利于实现在水资源日益紧缺的形势下水景建设的正常发展。     

一种基于改进支持向量机的文本倾向性分类算法

文本的倾向性分类器是文本倾向性分类的核心部分,它用于将待分类的文本映射到某一倾向性类别中去。传统支持向量机的核函数学习能力和泛化推广能力的平衡性有待提高,而且参数选择不易。对目前文本倾向性分类算法使用的传统的支持向量机进行了改进,一是构造了多核函数;二是使用粒子群算法对支持向量机的参数进行优化,平衡了核函数的全局性和局部性,更有利于对样本数据的学习和推广;最后利用改进的支持向量机构造文本倾向性分类算法。     

Parametric Studies on the Behavior of Reinforced Soil Retaining Walls under Earthquake Loading

The finite element procedures are extremely useful in gaining insights into the behavior of reinforced soil retaining walls. In this study, a validated finite element procedure was used for conducting a series of parametric studies on the behavior of reinforced soil walls under construction and subject to earthquake loading. The procedure utilized a nonlinear numerical algorithms that incorporated a generalized plasticity soil model and a bounding surface geosynthetic model. The reinforcement layouts, soil properties under monotonic and cyclic loadings, block interaction properties, and earthquake motions were among major variables of investigation. The performance of the wall was presented for the facing deformation and crest surface settlement, lateral earth pressure, tensile force in the reinforcement layers, and acceleration amplification. The effects of soil properties, earthquake motions, and reinforcement layouts are issues of major design concern under earthquake loading. The deformation, reinforcement force, and earth pressure increased drastically under earthquake loading compared to end of construction.     

改进的遗传算法对电液伺服系统PID调节器参数优化方法的研究

遗传算法是一种模拟自然界进化而形成的简单、高效的全局优化算法。本文研究了用改进的遗传算法对某机器人电液位置伺服系统的优化，着重将这种改进后的算法用于PID调节器的参数优化，编制了进化程序，并进行了仿真试验。结果表明用该方法可以有效地解决该电液位置伺服系统PID调节器参数的优化问题。     

浅谈异形柱框架结构的概念设计与要点

近年来,异形柱框架结构（框轻结构体系）,因其能较好地满足建筑使用上和结构性能上的要求,而逐步得到了推广应用,并被列为建设部首批住宅建设新技术推荐目录。但异形柱框架结构设计目前还没有可依据使用的国家标准和行业标准。文章根据对江苏省地方标准《钢筋混凝土异形柱框架结构技术规程》（DB32／512—2002）的理解,结合设计实践经验。浅谈异形柱框架结构和概念设计与要点。     

有耗网络S参数特征相位的统计约束

本文从大数统计角度，对有耗网络理论作了进一步深入研究。文中揭示了有耗网络除Ｈｅｒｍｉｔｅ矩阵正定性所造成的不等式约束而外，还存在一类重要的特征相位分布的统计约束，现有实验结果与本文结论相容。     

AOT及其复配体系的中相微乳液研究

在表面活性剂－醇－正辛烷－盐水体系中，研究了以双－２－乙基己基磺琥珀酸钠，十六烷基三甲溴化铵及ＡＯＴ与ＣＴＡＢ的复配物为表面活性剂时形成的微乳液性质，考察了ＮａＣｌ浓度、醇的种类与浓度对体系相行为与中相微乳液特性的影响。研究结果表明，ＡＯＴ与ＣＴＡＢ按１：７按摩尔比复配时有显著的协同效应，最佳中相微乳液体积大幅度增加；该体系的最佳含盐量对醇分子碳链长度的变化特别敏感。     

Process Development and Product Quality of Micro-Metal Powder Injection Molding

Injection molding has been found to be an efficient and cost-effective manufacturing technique for the production of a wide variety of parts and components at both macro- and microscale. This is attributed to the application of robust design and process development. However, every manufacturing technique is challenged by quality issues and part defects, but tackled by continuous improvement framework(s). This systematic monitoring and control approach of dimensional accuracy, mechanical properties, and surface quality of the finished part strongly depend on process conditions at different production stage. Therefore, the aim of this study is to review process development of micro-metal injection molding; focusing on critical factors influencing part quality and optimization of process parameters. The critical factors that influenced the finished part quality are part design, mold design, material selection, machine, and process conditions. Optimizing mold temperature, melt temperature, injection speed, injection pressure, cooling time, packing, and holding parameters improve the quality of the molded part. This trend of process development of injection molding gave rise to a broad scope of applications with brighter future potentials for the next decades, particularly for medical and electronics applications.