扣件式钢管脚手架框架模型的计算长度修正系数法

采用三维有限元方法,在框架理想刚节点计算模型的假设下,对以前的脚手架整架稳定承载力试验进行了分析,提出将实际测试结果通过规范的稳定系数表换算为立杆等效计算长度,再由有限元分析结果通过欧拉公式换算成立杆计算长度,将此二者的比值作为计算长度修正系数,可用于一般的脚手架计算。     

进气冷却式回热燃气轮机循环数值模拟和分析

针对简单循环燃气轮机性能偏低且易受大气温度变化的影响，本文提出了一种由吸收制机徊汽轮机组成的新型循环－－进气冷却式回热式燃气机循环，对其建模进行数值模拟和分析。结果表明，此循环既能较大幅度提高燃气轮机装置的性能，又能有效地改善燃气轮机性能对大气温度变化的敏感性。     

曲线区段接触线拉出值的确定

分析了曲线区段接触线拉出值超标的原因,提出了影响拉出值的各主要因素的计算式,并在忽略了一些影响列车振动的次要因素的条件下,得到了曲线区段弓-网位置的动态变化情况,进而讨论了接触线拉出值的选取原则。     

淋巴细胞脂质过氧化在充血性心力衰竭发生中的作用

对36例充血性心力衰竭（CHF）患者及32例健康者淋巴细胞的超氧物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH－Px）、肌酸激酶（CK）和谷草转氨酶（GOT）活性及脂质过氧化物（LPO）含量进行测定。发现CHF患者淋巴细胞SOD、GSH－Px及GOT活性明显低于健康对照组；而CK活性和LPO含量高于健康对照组。结果表明，CHF患者的抗脂质过氧化能力减弱。     

B2C电子商务网站商品信息搜索系统研究

从电子商务中商品信息及其评价获取的实际应用出发,在分析了搜索技术在电子商务中的作用和应用现状的基础上,设计了一个用于搜索商品信息和商品评价的Internet信息搜索系统;并从实现技术上,提出了开发这个系统的体系结构,分析了各组成模块的功能和特点,着重研究了Internet信息搜索系统中的网络蜘蛛相关技术。     

基于公交枢纽导向的新城区土地利用模式

本文基于新城区的特点,将公交枢纽导向发展理念引入新城区土地利用模式中,提出了新城区交通与土地协调发展的规划思路,探讨了枢纽区域宏观布局、微观选址的规划方法。并对枢纽区域的土地利用模式提出了新的思路。研究结果表明：基于公交枢纽导向发展模式的规划方法是新城区土地利用规划的一种理想模式。     

非对称连拱隧道非对称中隔墙施工力学行为研究

为研究非对称连拱隧道中非对称中隔墙在施工过程中的力学特性,以湖南省塞子界隧道为工程背景,基于普氏平衡理论,分析了中隔墙的受力特点和偏转机制;建立MIDAS/GTS三维数值模型,模拟分析不同形式的中隔墙在施工过程中位移和应力的变化规律,对比分析了隧道施工监测数据与数值模拟数据。研究结果表明：在非对称连拱隧道(左侧大洞径隧道、右侧小洞径隧道)中,中隔墙会向大洞径隧道发生偏移,且发生逆时针偏转;以中导洞中心线对称,减小小洞径隧道侧中隔墙厚度,使小洞径隧道侧中隔墙厚度小于大洞径隧道侧中隔墙厚度时,左右隧道拱顶沉降均减少,中隔墙下墙角处竖向位移、中隔墙中心线顶点和中隔墙墙底中点水平位移均减小,中隔墙上墙角受力情况更良好,整体偏转幅度更小,稳定性更高,但非对称中隔墙整体厚度减小量应适量。     

Receiver autonomous integrity monitoring availability and fault detection capability comparison between BeiDou and GPS

This paper used the statistical methods of quality control to assess receiver autonomous integrity monitoring （RAIM） availability and fault detection （FD） capability of BeiDou14 （Phase II with 14 satellites）, BeiDou （Phase III with 35 satellites） and GPS （with 31 satellites） for the first time. The three constellations are simulated and their RAIM performances are quantified by the global, Asia-Pacific region and temporal variations respectively. RAIM availability must be determined before RAIM detection. It is proposed that RAIM availability performances from satellites and constellation geometry configuration are evaluated by the number of visible satellites （NVS, NVS 〉 5） and geometric dilution of precision （GDOP, GDOP 〈 6） together. The minimal detectable bias （MDB） and minimal detectable effect （MDE） are considered as a measure of the minimum FD capability of RAIM in the measurement level and navigation position level respectively. The analyses of simulation results testify that the average global RAIM performances for BeiDou are better than that for GPS except global RAIM holes proportion. Moreover, the Asia-Pacific RAIM performances for BeiDou are much better than that for GPS in all indexes. RAIM availability from constellation geometry configuration and RAIM minimum FD capability for BeiDou14 are better than that for GPS in Asia-Pacific region in all cases, but the BeiDou14 RAIM availability from satellites are worse than GPS＇s. The methods and conclusions can be used for RAIM prediction and real-time assessment of all kinds of Global Navigation Satellite Systems （GNSS） constellation.     

Temperature adjustment mechanism of composite embankment with perforated ventilation pipe and blocky stone

Based on the advantages of perforated ventilation characteristic of perforated ventilation pipe embankment and large porosity of blocky stone embankment, composite embankment with ventilation pipe and blocky stone is more efficient to protect the underlying permafrost. The temperature fields and cooling effect of composite embankment with air doors are simulated by examining the effects of holes＇ position drilled in the pipe, diameter in pipe and density of holes. It is shown that the underlying permafrost temperature obviously reduces by composite methods, the location of 0℃ isotherm raises significantly, especially permafrost temperature under the center and shoulder of embankment reduces more quickly, the composite embankment with holes drilled in the lower side of pipe is the most efficient, the increase of diameter has a slight influence on the 0℃ isotherm＇s raising, and the density of holes slightly influences the raising of 0℃ isotherm.