铝板件自冲铆接的实验分析

本文介绍了一种新型的铝板件冲压连接技术,并根据实验结果阐述了自冲铆接的机理,分析了铆钉和模具结构对连接性能的影响,并对自冲铆接与圆点冲压连接的强度进行对比.此外,本文对这种新型连接技术的实际应用作了简要介绍.     

Data depth and correlation

Summary: We describe depth–based graphical displays that show the interdependence of multivariate distributions. The plots involve one–dimensional curves or bivariate scatterplots, so they are easier to interpret than correlation matrices. The correlation curve, modelled on the scale curve of Liu et al. (1999), compares the volume of the observed central regions with the volume under independence. The correlation DD–plot is the scatterplot of depth values under a reference distribution against depth values under independence. The area of the plot gives a measure of distance from independence. Correlation curve and DD-plot require an independence model as a baseline: Besides classical parametric specifications, a nonparametric estimator, derived from the randomization principle, is used. Combining data depth and the notion of quadrant dependence, quadrant correlation trajectories are obtained which allow simultaneous representation of subsets of variables. The properties of the plots for the multivariate normal distribution are investigated. Some real data examples are illustrated. *This work was completed with the support of Ca Foscari University.     

Covariates and Random Effects in a Gamma Process Model with Application to Degradation and Failure

The gamma process is a natural model for degradation processes in which deterioration is supposed to take place gradually over time in a sequence of tiny increments. When units or individuals are observed over time it is often apparent that they degrade at different rates, even though no differences in treatment or environment are present. Thus, in applying gamma-process models to such data, it is necessary to allow for such unexplained differences. In the present paper this is accomplished by constructing a tractable gamma-process model incorporating a random effect. The model is fitted to some data on crack growth and corresponding goodness-of-fit tests are carried out. Prediction calculations for failure times defined in terms of degradation level passages are developed and illustrated.     

简洁风格的辨析

通过对手工业时代的审美特征的反思,指出了简洁风格是技术进步创造的,是符合潮流的一种本质上的新的追求.论述了简洁风格的利弊,指出新的工业化成衣是"服装服务于人"这一理念的实现.     

Regression Depth with Censored and Truncated Data

Abstract

In this article, we consider the problem of estimating regression coefficients for a linear model with censored and truncated data based on regression depth. Any line can be given a rank using regression depth and the deepest regression line is the line with the maximum regression depth. We propose a method to define the regression depth of a line in the presence of censoring and truncation. We show how the proposed regression performs through analyzing Stanford heart transplant data and AIDS incubation data.     

高速铁路钢轨波浪型磨耗研究及其防治建议

基于中国高速铁路钢轨出现波磨的现象，对高速铁路波磨的特点做了详细介绍。指出目前波磨理论的局限性，并分析了高速状态下波磨的动力学成因，以及钢轨材质对波磨的影响，并给出了可行的预防与减缓波磨的建议。     

市场经济的发展与我国户籍制度的改革

本文从经济基础与上层建筑相互关系原理出发 ,深入浅出地论证了户籍制度与经济体制的关系 ,并揭示了在计划经济体制向市场经济体制转轨过程中户籍制度改革的滞后性和存在问题 ,阐明了市场经济运作条件和规律对户籍改革的本质要求 ,指出了深化户籍制度改革的基本原则和方向 ,从我国的实际情况出发 ,提出了户籍制度改革的主要对策建议     

探析李安导演的影像表达与意境营造

著名华裔电影导演李安博采东西方之所长,用影像编织了一个独特的艺术领域。他在文本核心执着于戏剧性元素的追求,选择了一种静水流深、独具魅力的镜头语言,同时在意境营造中,以影像写诗,追求诗意的凝聚。     

多激光器在全息图拍摄中的应用

根据不同激光器的光波互不相干的特点,提出一种采用多个激光器制作全息图的方法,并对该方法在全息图拍摄中的应用进行举例阐述.利用该方法,可解决一般实验室由于没有大功率激光器而无法拍摄大景深或大幅面全息图的困难,且能简化一些特殊全息图拍摄光路的元件摆设和实验操作.     

Duffing-Holmes振子在刀具磨损检测中的应用

针对切削过程中刀具磨损程度难以识别的问题,文章根据混沌Duffing-Holmes振子对微弱周期信号极其敏感的 特点,提出将锋利和磨损的刀具在27种工作状态下采集的54组声发射数据作为外部的微弱摄动信号,分别输入到 Duffing-Holmes系统。为了解决混沌阈值求解时间的问题,研究了对分法最优算法来搜索Duffing-Holmes从周期态和混 沌态的Lyapunov指数阈值,首先,以0.1步长的Lyapunov指数确定一个粗略的阈值;然后根据对分法快速收索Duffing- Holmes振子混沌阈值的精确值,大大提高了阈值搜索速度,闽值大小对应了刀具磨损程度。