基于单片机的机械加工安全保护装置研究

利用红外发送接收装置及红外接近传感器,以单片机Atmega128为中央处理单元,研制开发了一种将机械生产过程中的危险区域分为2个等级,并给出不同的监测方法和危险事件发生时的处理方法,实现了降低生产现场事故几率目的的系统。文章介绍该系统的原理,以及硬件和软件的设计,并部分介绍了系统的应用过程。     

基于单片机的机械加工安全保护装置研究

利用红外发送接收装置及红外接近传感器,以单片机Atmega128为中央处理单元,研制开发了一种将机械生产过程中的危险区域分为2个等级,并给出不同的监测方法和危险事件发生时的处理方法,实现了降低生产现场事故几率目的的系统。文章介绍该系统的原理,以及硬件和软件的设计,并部分介绍了系统的应用过程。     

一种机载红外测量系统引导模块设计

在简要介绍红外测量引导模块工作原理基础上,介绍了红外测量引导模块的实现算法,详细设计了红外测量引导系统的软、硬件,通过机载雷达与引导系统对比试飞表明,引导系统输出数据准确、稳定,可以满足红外测量系统的引导需求,对同类产品研制具有借鉴意义。     

气象卫星云图在碧口水库及梯级调度的运用

本文简要介绍了碧口水电厂气象卫星云图处理系统的功能、预报原理,并对怎样利用风云-2E卫星实时云图资料,进行蓝勃托投影,采用概率分布方法,对碧口水库流域实际地理位置进行定标,并对红外数据进行反演,从而对未来降水作出定量预报等若干问题进行了分析和讨论。对该系统的运用情况进行了介绍,提出了相应的建议。     

气象卫星云图在碧口水库及梯级调度的运用

本文简要介绍了碧口水电厂气象卫星云图处理系统的功能、预报原理,并对怎样利用风云-2E卫星实时云图资料,进行蓝勃托投影,采用概率分布方法,对碧口水库流域实际地理位置进行定标,并对红外数据进行反演,从而对未来降水作出定量预报等若干问题进行了分析和讨论。对该系统的运用情况进行了介绍,提出了相应的建议。     

大空间智能自动扫描灭火系统在剧场中的应用

文章阐述了大空间智能自动扫描灭火系统的构成及工作原理,并附红外探测组件的工作原理图,详细展示红外智能组件的工作流程。结合剧场工程的实际情况,介绍了各组成组件的安装要求和注意事项。     

煤矿安全评价在安全生产中的重要性研究

现对安全评价指标体系进行了系统的分析,阐述了煤矿危险源理论与危险源辨识方法,并结合煤矿生产过程中的危险有害因素,建立了煤矿生产系统的安全评价体系。     

变电站高压开关柜在线测温系统设计

高压开关柜是电力工程中常见的电气设备,在长期运行过程中,触头、电缆接头等接点位置发热现象时有发生,及时、准确地对其进行监测显得十分重要。文章分析了高压开关柜产生温度过高的原因,从系统组成、原理及系统特点方面介绍了红外在线测温系统、光纤在线测温系统、无线式在线测温系统,并对各系统进行比较,阐明了各系统的特点。     

稳定平台控制系统研究

文章对稳定平台控制系统进行了研究,首先论述了红外成像跟踪系统工作原理和两通道伺服机构实现形式及系统主要性能指标的测试方法,其次介绍了控制回路构成、工作机制和具体设计方式,最后对硬件研制过程中遇到的问题进行了总结。     

微型化放入式电子测压器红外通信接口设计

文章介绍了基于单片机的红外串行通信接口的设计方案。该系统主要由TI公司的MSP430系列单片机和SHARP公司的GP2W0116YPS芯片构成。文章介绍了红外通信技术、器件选择和系统硬件设计,并结合软件设计说明了系统要实现的功能,最后通过VB设计的软件验证了该设计方案的可行性。实验结果表明,该系统控制方便,工作稳定,在微型化、低功耗的前提下能实现可靠的非接触式实时数据传输,在工程实践中具有重大的应用价值。     

基于模型分析的液压伺服系统性能参数预测

为了提高液压伺服系统的控制精度,文章对液压伺服系统中的一些非线性参数进行了预测与估计。参数估计之前,首先对目标液压工作系统进行了建模与参数化描述,抽取了其控制和工作模型,计算并推导了模型中主要的液压参数直接的数学关系,如液压受力分析、受力传递函数、噪声信号过滤函数等。在此基础上,采用最小二乘估计算法对液压伺服系统中的非线性参数进行预测,给出了详细的参数分析过程和预测参数推导过程,建立了主要参数的估计计算公式。最后,对所估计的非线性参数进行了仿真和测试。结果表明,文章所选择的参数预测结果与实际的运行结果基本吻合,预测算法参数估计误差小。     

城乡边缘带的景观生态构建功能

从景观生态学角度,分析了城乡边缘带在城市景观生态建设中具有景观自然组分的储备、城市景观格局的主构、城市景观的生态活化、城市景观的生态缓冲及城市景观生态系统的整流等特殊构建功能;提出上述功能在城市整体全局性基础上还具备功能形成的时空关联性、功能影响的两面性、构建功效的显著性和自然景观组分的主导性等功能属性.     

Visit planning by the rural family planning worker

This paper discusses a model of adoption of family planning methods in which the necessary conditions for acceptance are inferred from survey data. The dynamics of the adoption process is modelled as a Markov process. A dynamic programming formulation is used to find an optimal visit pattern for the field worker. The optimal solution recommends selectivity in visits. For the optimal strategy the relationship between total visit effort and the rate of acceptance is shown to be non linear and selectivity in visiting is shown to double acceptance. The strategy of selectivity was implemented in a field unit experiment, where the performance of the worker and the field unit was shown to improve considerably.     

Does total quality management affect applicant perceptions of recruitment and selection processes?

145 job seeking engineers were surveyed to determine whether applicants who interviewed at Total Quality Management (TQM) organizations perceived any differences in the way they were recruited or selected as compared with those who interviewed at non-TQM firms. TQM firms were identified in two ways: “explicit TQM” (where applicants were specifically told that the firm was a TQM employer) and “inferred TQM” (where TQM was inferred on the basis of specific reported practices). Results showed that there were significant differences between TQM firms (regardless of classification) and non-TQM firms, and between explicit TQM firms and inferred TQM firms. For example, explicit TQM firms screened more stringently, whereas inferred TQM status was predictive of positive applicant reactions to the people met during the site visit. Implications for practice and future research are discussed.     

流程管理体系研究

文中从流程管理概念出发,构建流程管理体系,结合万科集团对于流程管理体系的具体应用,说明流程管理体系的建立与运用,会给企业注入鲜活的血液,使企业更好地运作,不断地成长。因此,研究流程管理体系是必要的。     

Co-movement in the price of risk of aggregate equity markets

This paper examines the issue of co-movement in G7 equity markets. Earlier research in this area has focussed on the first or the second moment of the return process from different markets. The approach in this paper takes the analysis to a finer level to examine the co-movement between these markets. The price of risk from the equity market is inferred in an unobserved component modelling framework to study the co-movement using a non-parametric measure of association, concordance. The findings of this paper also indicate that the price of risk is more important than volatility in explaining movements in excess return.     

Causal inferences on the cost overruns and schedule delays of large‐scale U.S. federal defense and intelligence acquisition programs

A study was undertaken to understand why cost overruns and schedule delays have occurred and continue to occur on large‐scale U.S. Department of Defense and intelligence community programs. Analysis of data from this study infers the causes of cost overruns and schedule slips on large‐scale U.S. federal defense and intelligence acquisition programs to ineffective human resources policies and practices, consolidation of the aerospace industry, and too many stakeholders. In this article, each inferred cause and the resulting systematic effects are discussed in detail. Moreover, block diagrams have been developed for each cause and illustrate the sequential flow from inferred cause to systematic effects and reveal key interrelationships among each cause.     

基于MES的质量管理信息系统的研究

针对制造过程对质量管理的信息化需求，设计了基于制造执行系统（MES）的质量管理信息系统。着重从数据定义和过程描述两方面，说明制造过程中质量活动和生产活动的联系，体现本系统面向制造过程的特征。