女大学生心理健康问题的理论思考

女大学生是大学生中的一个特殊群体，由于她们复杂的角色身份，使她们内心充满矛盾，出现不同程度的心理问题。认真研究和掌握女大学生心理问题的现状，了解女大学生心理问题产生的原因，根据女大学生群体心理特点，为她们提供针对性强的指导，帮助她们走出心理困境。     

Research for the Algorithm of Nonlinear Two Stage Least Squares Estimator

ＲｅｓｅａｒｃｈｆｏｒｔｈｅＡｌｇｏｒｉｔｈｍｏｆＮｏｎｌｉｎｅａｒＴｗｏＳｔａｇｅＬｅａｓｔＳｑｕａｒｅｓＥｓｔｉｍａｔｏｒＺＨＯＮＧＤｅｎｇｈｕａ；ＷＡＮＧＲｅｎｃｈａｏ；ＬＩＵＢａｏ；ＺＨＡＮＧＳｈｉｙｉｎｇ（ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ...     

高德矿增大水砂充填供水能力的研究

因充填供水管年久失修,管径相对缩小,供水能力降低,充填能力不够,严重影响矿井生产。本文论述了在不停产条件下,改造充填供水管,增加充填能力的措施及实施后的效果。     

交通流时间序列中混沌特性判定的替代数据方法

替代数据方法是判定时间序列中是否具有混沌特性的一种有效方法，本文介绍了该方法中一种基于关联维数的混沌判据。并将该方法应用于１５分钟和５分钟采样周期的实测交通流时间序列中，计算结果表明交通序列中含有混沌特性。     

Probabilistic D-Clustering

We present a new iterative method for probabilistic clustering of data. Given clusters, their centers and the distances of data points from these centers, the probability of cluster membership at any point is assumed inversely proportional to the distance from (the center of) the cluster in question. This assumption is our working principle. The method is a generalization, to several centers, of theWeiszfeld method for solving the Fermat–Weber location problem. At each iteration, the distances (Euclidean, Mahalanobis, etc.) from the cluster centers are computed for all data points, and the centers are updated as convex combinations of these points, with weights determined by the above principle. Computations stop when the centers stop moving.     

Number crunching vs. number theory: computers and FLT,from Kummer to SWAC (1850–1960), and beyond

The present article discusses the computational tools (both conceptual and material) used in various attempts to deal with individual cases of FLT, as well as the changing historical contexts in which these tools were developed and used, and affected research. It also explores the changing conceptions about the role of computations within the overall disciplinary picture of number theory, how they influenced research on the theorem, and the kinds of general insights thus achieved. After an overview of Kummer’s contributions and its immediate influence, I present work that favored intensive computations of particular cases of FLT as a legitimate, fruitful, and worth-pursuing number-theoretical endeavor, and that were part of a coherent and active, but essentially low-profile tradition within nineteenth century number theory. This work was related to table making activity that was encouraged by institutions and individuals whose motivations came mainly from applied mathematics, astronomy, and engineering, and seldom from number theory proper. A main section of the article is devoted to the fruitful collaboration between Harry S. Vandiver and Emma and Dick Lehmer. I show how their early work led to the hesitant introduction of electronic computers for research related with FLT. Their joint work became a milestone for computer-assisted activity in number theory at large.     

In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

A numerical study of stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions was conducted with finite element modeling simulations under different assumptions.Fatigue mechanisms were also analyzed accordingly.The results showed that the effects of inclusions on fatigue life will distinctly decrease if the mechanical properties are close to those of the steel matrix.For the inclusions,which are tightly bonded with the steel matrix,when the Young’s modulus is larger than that of the steel matrix,the stress will concentrate inside the inclusion;otherwise,the stress will concentrate in the steel matrix.If voids exist on the interface between inclusions and the steel matrix,their effects on the fatigue process differ with their positions relative to the inclusions.The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of inclusions on fatigue behavior and lead to a sharp stress concentration.The void on the top of inclusion along the fatigue loading direction will accelerate the debonding between the inclusion and steel matrix.     

糠醛气相脱羰Pd-Ni/γ-Al2O3催化剂的再生

对糠醛气相脱羰制呋喃用Pd-Ni／γ-Al2O3催化剂的失活原因进行了分析。利用空气氧化法、氨气活化法、溶剂洗涤法、硝酸镍浸渍法对失活催化剂进行了再生实验研究．找出失活Pd-Ni／γ-Al2O3催化剂的最优再生方法——硝酸镍浸渍法,确定了糠醛气相脱羰Pd-Ni／γ-Al2O3催化剂的最佳再生工艺参数。通过催化活性评价、物性分析表明．其再生效果较好。     

AUTOMATIC DECISION-MAKING： NEURAL FIRING AND RESPONSE

1. Introduction This is the fourth exposition on theAnalytic Hierarchy Process. It is true thatmany decisions we make subconsciously ariseout of our physical and biological needs andderive from the pressure to survive physically.We also make subconsciou…