建立唐山教育科研网的可行性研究及总体方案

计算机、通信和有线电视三大热门技术互相渗透 ,相互交融。用有线电视网组建教育科研网不再需要巨额投资。具有带宽、上网速度快、接入方便、技术力量雄厚的特点。信息资源是网络的灵魂 ,应给予极大的重视。组建各类上网数据库 ,使网上信息能及时更新 ,方便查找     

面向对象编程技术在索穹顶结构中的应用

本文讨论了面向对象编程技术的特点，以及该技术在编制索穹顶结构全面优化设计程序中的应用。     

电缆附件接触应力的光弹性实验研究

采用光弹性实验方法验测得电缆附件接触界面的应力分布，并在此基础上优化电缆附件接触界面的结构参数以改进理论设计，实验结果表明这种方法是非常有效的。     

如何共享cable modem宽带上网

在目前电信大力推广的Internet宽带接入方式中,大多采用以太网接入或ADSL接入方式.而在尚未开通上述业务的地区,只要能够接收到电信的有线电视信号,就可采用线缆调制解调器(即cable modem)接入方式,我院目前采用的就是这种宽带上网的方法.本文从实用技术角度,对相关的网络安装配置操作做了较为详细的介绍.     

壁面清洗机器人发展趋势浅析

本文综述了国内外壁面清洗机器人的研究概况 ,重点介绍了几种典型的壁面清洗机器人 ,据此对壁面清洗机器人向实用化方向发展进行了论述 ,指出了利用风扇使清洗机构吸附于壁面 ,并将行走与清洗机构相分离 ,这种设计思路的优越性     

汇率制度退出与转型：文献综述

如何退出已有汇率制度安排，向更具弹性的汇率制度转型？这是当前新兴市场和发展中国家面临的一个重要问题。在维持已有制度的边际成本与边际收益一致时退出已有汇率制度是最优的。最佳退出时机的经验判断原则取决于该国的经济结构、经济发展阶段、经济冲击、政治与制度因素等。这些因素同时也决定了该国汇率制度退出和转型的策略选择。汇率制度转型所需的基本条件是：一个具有一定深度和一定流动性的外汇市场，一套连贯的中央银行外汇市场干预的政策措施，一个恰当的名义锚，监测和管理公共部门和私人部门外汇风险暴露的有效机制。     

Therapeutic Hypothermia: Quantification of the Transition of Core Body Temperature Using the Flexible Mixture Bent‐Cable Model for Longitudinal Data

Hypothermia which is induced by reducing core body temperature is a therapeutic tool used to prevent brain damage resulting from physical trauma. However, all physiological systems begin to slow down due to hypothermia and this can result in increased risk of mortality. Therefore quantification of the transition of core body temperature to early hypothermia is of great clinical interest. Conceptually core body temperature may exhibit an either gradual or abrupt transition. Bent‐cable regression is an appealing statistical tool to model such data due to the model's flexibility and readily interpretable regression coefficients. It handles more flexibly models that traditionally have been handled by low‐order polynomial models (for gradual transition) or piecewise linear changepoint models (for abrupt change). We consider a rat model to quantify the temporal trend of core body temperature primarily to address the question: What is the critical time point associated with a breakdown in the compensatory mechanisms following the start of hypothermia therapy? To this end, we develop a Bayesian modelling framework for bent‐cable regression of longitudinal data to simultaneously account for gradual and abrupt transitions. Our analysis reveals that: (i) about 39% of rats exhibit a gradual transition in core body temperature; (ii) the critical time point is approximately the same regardless of transition type; and (iii) both transition types show a significant increase of core body temperature followed by a significant decrease.     

The Consumer Gains from Direct Broadcast Satellites and the Competition with Cable TV

This paper examines direct broadcast satellites (DBS) as a competitor to cable. We first estimate a structural consumer level demand system for satellite, basic cable, premium cable and local antenna using micro data on almost 30000 households in 317 markets, including extensive controls for unobserved product quality and allowing the distribution of unobserved tastes to follow a fully flexible multivariate normal distribution. The estimated elasticity of expanded basic is about ‐15, with the demand for premium cable and DBS more elastic. The results identify strong correlations in the taste for different products not captured in conventional logit models. Estimates of the supply response of cable suggest that without DBS entry cable prices would be about 15 percent higher and cable quality would fall. We find a welfare gain of between $127 and $190 per year (aggregate $2.5 billion) for satellite buyers, and about $50 (aggregate $3 billion) for cable subscribers.     

一种微波波导电缆拉制机用计算机控制系统

针对一种自行研制并投入实际应用的椭圆波导拉制机用计算机控制系统,介绍了其系统结构设计、功能设计与有关软、硬件的具体实现方法。该系统在单片机控制系统的控制下,自动完成椭圆波导电缆的拉制。经过试运行表明,系统能满足设计和使用要求。     

面向损伤识别的独塔斜拉桥模型的设计与分析

模型试验方法是桥梁结构损伤识别研究的一种重要手段。以某虚拟的独塔斜拉桥为原型,面向损识别设计制作了独塔斜拉桥试验模型。试验模型各主要构件（主梁、主塔、斜拉索）均独立加工制作,其中主梁选用铝合金材料,截面采用箱形,划分为不同长度的阶段,各节段均采用螺栓连接。通过改变节段板厚的方法实现主梁不同损伤程度的模拟,不同位置的损伤通过更换不同位置的板厚实现,从而方便的实现了模拟模型斜拉桥主梁的各种损伤状态。采用特殊的设计实现了斜拉桥结构索力的实时测试。对模型进行了静态试验,并与有限元模型计算的结果进行了对比分析。试验研究与数值分析为今后的损伤识别研究奠定了基础。