确定摆杆盘形凸轮机构基本尺寸的线图法研究

本文研究了摆动从动件盘形凸轮机构按推程许用压力角确定基本尺寸的数学模型。在此基础上,利用计算机运算的数值建立了选择机构基本参数用的线图。研究结果表明,应用线图确定基本尺寸的方法,既正确又十分迅速、方便,很适宜在机械工程设计中使用。     

The effects of different choices of order for autoregressive approximation on the Gaussian likelihood estimates for ARMA models

This paper investigates, by means of Monte Carlo simulation, the effects of different choices of order for autoregressive approximation on the fully efficient parameter estimates for autoregressive moving average models. Four order selection criteria, AIC, BIC, HQ and PKK, were compared and different model structures with varying sample sizes were used to contrast the performance of the criteria. Some asymptotic results which provide a useful guide for assessing the performance of these criteria are presented. The results of this comparison show that there are marked differences in the accuracy implied using these alternative criteria in small sample situations and that it is preferable to apply BIC criterion, which leads to greater precision of Gaussian likelihood estimates, in such cases. Implications of the findings of this study for the estimation of time series models are highlighted.     

一种视频图像中运动目标检测方法研究

针对序列图像中的运动目标检测问题,在独立分量分析的基本理论和算法的基础上,提出采用基于正交对称矩阵的快速定点算法对实际视频图像中的运动目标进行运动检测的方法。实验结果表明:该方法不仅能检测运动轨迹,还能提取运动目标的轮廓,并判断运动方向,是一种有效的运动目标检测方法。     

论城市房屋拆迁侵权类型及其责任方式

由于城市化进程的发展,我国的城市房屋拆迁行为愈渐频繁。由于政府在拆迁行为过程中角色的错位,未按照法定程序以及开发商的补偿不合理等原因导致的侵权行为愈演愈烈。新的《物权法》已经出台并付诸于实施,在这一新的法律制度环境下,如何去规制拆迁行为中的秩序,维护相对方的利益,明确各方责任将是本文着重探讨的重点。     

整村搬迁移民扶贫中存在的问题及对策

为了达到扶助贫困和改善生态环境的目的,需要对贫困地区和生态环境恶劣的地方实行整村搬迁的政策,而在实际操作中存在着搬迁费用高,移民安置缺乏后续扶持,违背移民自愿搬迁的原则,安置移民的潜力有限等问题。针对这些问题,建议加大对移民直接补贴力度,拓展移民生存与发展能力,引导移民自愿搬迁,挖掘资源和转变移民安置方式。     

倾角传感器动态测量研究

根据测试系统运动方式、工作状况和动态特性，分析其对测试结果的影响．给出一种适用于轨道倾斜角度动态测量的分析方法和计算公式，为测量系统的结构设计、电路设计和实际应用提供参考．     

越王勾践迁都绍兴龙山述议

勾践迁都绍兴,是于越民族由部落走向国家集团的重要活动之一。这次伟大的迁移运动促进了于越民族的中 原化,并加快了向中原融合的步伐。这次迁移活动对绍兴有十分重大的意义。     

民国时期“闯关东”运动的特点探析

民国以来,华北民众的"闯关东"运动持续发展,至20世纪20年代中后期达到顶峰.然而,"九·一八"事变的爆发使整个人口迁移的形势为之一变.事变后闯关移民的年龄、性别、职业构成、地域分布等方面与事变前迥然不同,呈现出新的特点.通过对民国时期"闯关东"运动特点的考察,可以看出,"九·一八"事变前,华北向东北的人口迁移是我国农村劳动力的自由流动,其性质属于中国人口自发的国内转移,是中华民族自身的客观调节运动.事变后,进入东北地区的华北人口,不再是自由流入谋生,而是被作为"苦力"招骗而来,其实质是为日本的经济侵略和殖民统治服务.     

进城务工人员随迁子女语言应用的现状及对策研究——以成都市为例

近年来,进城务工人员随迁子女的语言应用与训练成为社会关注的热点。进城务工人员随迁子女语言应用面临如下现状:自身受方言影响根深蒂固,语言习惯差;学校对推广普通话重视不够,教师的普通话水平有待提高;家庭语言培养环境缺失;社会语言环境欠佳,说普通话的氛围不浓等。为此,政府、学校、家庭、社会等应多方参与,形成教育合力,创造条件,加强进城务工人员随迁子女的社会融入度;提高认识,加大推广普通话的力度;主动与孩子加强交流;营造良好的普通话交际氛围等。分析进城务工人员随迁子女语言应用面临的现状,积极探求他们语言应用能力培养的有效策略,不仅有利于提高他们的自身素质,更有利于维护社会的稳定、和谐。     

A Multivariate Adaptive Exponentially Weighted Moving Average Control Chart

A multivariate extension of the adaptive exponentially weighted moving average (AEWMA) control chart is proposed. The new multivariate scheme can detect small and large shifts in the process mean vector effectively. The proposed scheme can be viewed as a smooth combination of a multivariate exponentially weighted moving average (MEWMA) chart and a Shewhart χ²-chart. The optimal design of the proposed chart is given according to a pre-specified in-control average run length and two shift sizes; a small and large shift each measured in terms of the non centrality parameter. The signal resistance of the newly proposed multivariate chart is also given. Comparisons among the new chart, the MEWMA chart, and the combined Shewhart-MEWMA (S-MEWMA) chart in terms of the standard and worst-case average run length profiles are presented. In addition, the three charts are compared with respect to their worst-case signal resistance values. The proposed chart gives somewhat better worst-case ARL and signal resistance values than the competing charts. It also gives better standard ARL performance especially for moderate and large shifts. The effectiveness of our proposed chart is illustrated through an example with simulated data set.