谈微型计算机运行的可靠性

本文围绕微机的固有可靠性、使用可靠性、环境适应性，阐述影响微机可靠性的因素，如何确保微机可靠运行．     

杨凌水电站励磁调节装置的改造浅析

微机励磁调节已经开始全面应用于现代化水电站,并获得进一步的研究和发展。杨凌水电站的励磁装置经过改造,采用微机励磁调节装置,性能已经远远优于未改造之前的励磁调节装置。本文主要从原理和结构上分析了励磁调节装置的缺点和不足及微机励磁调节装置在性能上的优化和使用上的便捷。     

《大学生主观幸福感问卷》的编制

过去国内对主观幸福感(包括大学生)的研究更多是直接引用或修订国外编制的问卷或量表.所以引用过程中民族个性差异,人口统计量的差异,文化差异以及翻译等额外变量使得研究结论的准确性受到质疑,所以编制适用于中国大学生特点的问卷对主观幸福感的本土化研究有着重要意义.     

罪刑法定的明确性与口袋条款的合宪性审查

刑法是直接以限制或者剥夺公民个人的自由与权利的法律,因此刑法的行使必须遵循罪刑法定原则。罪刑法定原则一经提出,就被上升为宪法的高度,在大多数国家的宪法原则中予以确认。罪刑法定原则要求刑法规范必须明确,“不明确即无效”。按照罪刑法定原则的要求,刑法中的口袋条款没有明确性,违背人权保障的宪政精义。     

A Simple Model to Determine the Efficient Duration of Exams

This study develops a theoretical model for the costs of an exam as a function of its duration. Two kind of costs are distinguished: (1) the costs of measurement errors and (2) the costs of the measurement. Both costs are expressed in time of the student. Based on a classical test theory model, enriched with assumptions on the context, the costs of the exam can be expressed as a function of various parameters, including the duration of the exam. It is shown that these costs can be minimized in time. Applied in a real example with reliability .80, the outcome is that the optimal exam time would be much shorter and would have reliability .675. The consequences of the model are investigated and discussed. One of the consequences is that optimal exam duration depends on the study load of the course, all other things being equal. It is argued that it is worthwhile to investigate empirically how much time students spend on preparing for resits. Six variants of the model are distinguished, which differ in their weights of the errors and in the way grades affect how much time students study for the resit.     

神经网络在混凝土结构可靠度评估中的应用

由于混凝土结构股役期间大量不确定因素的影响，有时难以利用确定性函数或专家系统计算结构的性能退化。本文利用有限的样本建立并训练BP神经网络，推广出混凝土结构抗力的时变规律，并应用混凝土结构时变可靠度评估中，计算简单，精度高。     

基于指数分布预测问题的研究

本文主要运用贝叶斯统计的理论与方法,对截尾寿命试验根据其早期结果预测下一个失效时间,并对指数分布情形下的失效时间,进行了详细的讨论,得出其下一个失效时间的点估计与区间估计,并进行随机模拟。     

4G核心技术OFDM及MIMO原理

正交频分调制(OFDM)是一种新型调制技术,特别适合在频率选择性多径衰落信道中高速传输数据.而M IMO技术能够在空间中产生独立的并行信道同时传输多路数据流,这样就在不增加系统带宽的情况下增加频谱效率.可以看出这两者的结合是一种必然的趋势,并会成为第四代移动通信的关键技术.     

Credibility and Security of Weighing System for Large Structure Object

The weighing system designed for large structure object is mainly composed of three parts. The part of hydraulic system is made up of hydraulic cylinders, high pressure hydraulic hoses and electric pumps; the part of computer controlling system comprises pressure sensors, displacement sensors, data acquisitions, RS 485 network and the computer controlling model; the part of loading system is composed of the fulcrum structure and the concrete girder. The measurement principle and composition of the weighing system are discussed in this paper. Credibility and security of the weighing system are fully considered during the design phase. The hydraulic system is controlled by pilot operated check valves in case of the sudden loss of system pressure. The states of all gauges and RS485 network are monitored by computer controlling system functioning in different modules. When the system is running incorrectly, it will be switched to manual mode and give alarm. The finite element method is employed to analyze fulcrum structure so that the system has enough intensity to be lifted. Hence the reliability of the whole system is enhanced.     

高校仪器设备寿命周期与延长寿命周期探讨

本文结合笔者在教学仪器设备管理和使用维修中的实践经验，就设备自身寿命周期受有形磨损和无形磨损而老化；设备的先进程度，科学技术与生产力的发展速度对设备寿命周期的影响，掌握使用设备时期的规律，提高购置设备的超前意识等进行了讨论。