数据库在电站微机测试系统中的应用

以Access数据库在电站微机测试系统中的工程应用为基础,给出了数据库的基本概念及结构,并结合电站测试标准要求及测试方法给出了具体数据库的设计方法。该系统已在国家内燃机电站检验中心得到了应用。实践表明:通过对数据库的有效设计,可极大地提高测试效率。     

论企业服务质量

本文对企业提高服务质量的特性、特征进行了分析，提出了企业服务质量的测定和管理方法。     

浅析ARP欺骗原理及解决方法

在局域网中,通信前必须通过ARP协议来完成IP地址与第二层物理地址（即MAC地址）的转换。由于ARP协议存在安全漏洞,使得ARP欺骗相应产生。从一个实例解析ARP欺骗的原理和其解决方案。     

数字移动通信接入信令分析

阐述了数字移动通信的关键技术——接入信令。对接入信令的格式、传输协议和传输方式等进行了具体分析。     

Providing Public Access to the Shore: The Role of Coastal Zone Management Programs

In many coastal states and territories, coastal zone management (CZM) programs have been the prime catalyst in leveraging public access initiatives among state and federal agencies, public organizations, and the private sector. A wide range of tools are used, including acquisition, regulations, technical assistance, and public education. The diversity of approaches is illustrated through a variety of case examples. Although hard numbers for measuring outcomes were not uniformly available, between 1985 and 1988, when federal and state CZM funding dedicated to public access was tracked, $141.5 million (unadjusted 1988 dollars) were spent on 455 public access-related projects. A policy shift occurred in the 1990s away from reliance on acquisition and regulation as the most effective means of providing access and toward technical assistance and public outreach-a response to the overall decrease in funds available for access. CZM programs have been able to balance the contradictory goals of the federal Coastal Zone Management Act of 1972 (CZMA), such as protecting coastal resources while providing for increased public access to those resources. It is recommended that CZM programs conduct assessments to determine the kind of access needed in the future and where it should be located. And, due to the creativity and innovation that states and territory coastal programs use to achieve access, it is recommended that a national clearinghouse be established for documenting and sharing information on innovative tools and programs.     

Does competitive tendering improve customer satisfaction with public transport? A case study for the Netherlands

During 10 years experience with competitive tendering of regional and local public transport in the Netherlands, national average trip satisfaction of passengers increased from 6.84 to 7.25 (+0.41). This is a remarkable improvement, but a closer look at the data reveals that also in regions without competitive tendering the improvement in satisfaction was substantial. The difference in the improvement for regions with and without tendering is only +0.06. Tendering led in the majority of concession areas to an improvement of average trip satisfaction, but in some 40% of the cases a deterioration was observed. A change of operator in general has a negative impact on satisfaction. We also find that the effect on satisfaction of early tendering is larger than of later tendering. This may well be the consequence of a shift in emphasis of authorities and operators from quality improvement to efficiency improvements. The model building and analysis is based on the comparison per year-pair of regions tendered versus regions non-tendered (in that specific year-pair). So we compare the effects on satisfaction of tendered regions relative to non-tendered regions.An analysis concerning the weighted satisfaction judgments of 15 underlying service attributes revealed that ‘service frequency, on-time performance, travel speed, and vehicle tidiness’ contribute the most to the effect on satisfaction in the tendered regions. We found that new vehicles impact highly on satisfaction with travel speed and vehicle tidiness. The emphasis in the tenders with increasing service frequency, led to an increase in satisfaction but, may have a deteriorating effect on (the satisfaction with) on-time performance.     

铁路货运服务质量评价探讨

铁路货运服务质量关系到铁路企业形象和效益。采取定性和定量相结合的研究方法,建立功能质量测评体系,根据货运部门自身的特点建立相应的技术质量量化测评体系,最终将指标数量值转化成评定的等级。并通过实例验证了该评价方法的现实性和可操作性。     

Public transport in towns - Inevitably on the decline?

Bus transport in Linköping, a town of 140?000 people, was strongly on the increase up to the beginning of the 1980s, when a negative trend-break occurred. A demand model is developed which explains both the ongoing decline and the preceding increase. Based on this model, it is examined whether a change of the current bus transport policy towards an optimal pricing and investment policy from a social point of view could evoke a new and positive trend-break. Taking current trends in the exogenous factors into account it would. However, this could depend on a possible revival of bicycling in towns.     

汽车制动器使用寿命的理论计算

根据汽车制动器的工作条件和磨损性质，采用理论计算的方法预测汽车制动器的使用寿命。通过理论计算，认为制动器制动衬片宽，制动鼓直径大，均能延长制动器工作期限；在使用中，汽车载货质量大，行驶速度高均将加速制动器间隙的增长，缩短其工作期限。     

多楔带轮系的布置,计算和寿命分析

介绍了多楔带的结构及特点，结合多楔带在汽车发动机附件传动系中的应用，总结了多楔带传动轮系的布置设计方法和原则，分析了多楔带的静态张力、动态张力和寿命及其影响因素，给出了相应的计算公式。所有公式在小红族轿车系设计中得到了应用与验证，其中带长计算的程序化实践证明具有实用价值。