大体积覆土开挖卸载对盾构隧道的变形影响

采用有限元软件,对曹妃甸工业区跨纳潮河综合盾构隧道管廊在运营阶段上方规划河的开挖工况进行了分析,对大范围覆土卸载条件下的盾构隧道变形进行了研究．结果表明：盾构隧道在上方覆土开挖卸载时变形存在4处反弯点．通过加密设置变形缝,可满足盾构变形需要．     

焦化废水中有机污染物好氧生物降解特性的研究

在实验室条件下，用瓦呼仪作为测试手段，研究了焦化废水中咪唑等八种有机物的好氧生物降解特性．并对这些有机物在单一基质和与苯酚共基质条件下降解特性的变化情况进行了研究．     

用三光束干涉法测量薄膜厚度

本文用三光束干涉法非接触地测量了薄膜厚度.该方法把位于中间的零级光作为测试光束,位于两侧的±1级光作为参考光束,不但具有精度高的特点,而且稍作改进还能用于其它多种参数的测量.     

Long-chain branched/cyclic alkanes in recent sediment of Lake Fuxian and their environmental implications

Lake Fuxian is a large, deep, and oligotrophic freshwater lake. In recent sediment of this lake, a series of branched and cyclic alkanes, including branched alkanes with one or two quaternary carbon atoms （C2n compounds）, alkylcycloheptane, and alkylcyclohexane, were detected in high abundance. For each homolog of long-chain branched/ cyclic alkanes, molecules with only an odd or even carbon number were present in the sediment. The abundance vari- ation of each compound homolog corresponded to those of other compound homolog in the section, indicating the same origin of these compounds. The concentrations of long-chain branched/cyclic alkanes in the sediment profile exhibited variations similar to those of phytoplankton biomarkers, such as 3-methylJalkanes, short-chain odd carbon n-alkanes, hopene, polyunsaturated fatty acids, phytol, sterols, and long-chain alkyl diols, but slightly different from those of long-chain odd carbon n-alkanes, which are ubiquitous biomarkers for higher plants. Therefore, the Can compounds and long-chain cyclic alkanes in the lake sediment were most likely produced by algae and bacteria in the water, primarily, by the heterotrophic bacteria in the moderately oxygenated waters, which flourishing might be the results of specific water environments in Lake Fuxian.     

液力缓速器瞬态两相流动大涡模拟及性能预测

为了全面掌握液力缓速器各个流动单元内速度场和压力场的分布特性,提取了全流道几何模型作为计算区域,利用CFD平台的大涡模拟法和多流动区域耦合计算的滑动网格法对液力缓速器内部气液两相流动进行了三维瞬态数值模拟,将混合模型与欧拉模型交替运用在其多相流模型中,获得了不同充液率下液力缓速器内流场结构的变化及两相体积分数分布情况,分析了流场内二次流、脱流及涡旋的产生机理,并计算了缓速器的外特性.结果表明:数值计算结果与试验结果吻合很好,误差在8％以内;流场计算十分准确,运用的大涡模拟方法可以有效地模拟液力缓速器流场内的真实液流结构,其结果可以用来指导液力缓速器的设计及其结构优化.     

钢支撑加固既有钢筋混凝土结构的方法概述

主要介绍目前建筑结构常用的钢支撑加固方法,并对各种方法的概念、适用范围等进行归纳.总结几种方法在建筑结构加固领域的优势和不足,确保钢支撑与混凝土框架结构之间的可靠连接,是实现钢支撑有效加固钢筋混凝土框架的关键所在.最后介绍国内外对钢支撑加固领域的研究进展和现状,并对加固方法的选择提出一些建议.     

应用微机技术实测轴承润滑状态的研究

本文介绍一种用应变片实测轴承内部的润滑状态及其测试仪器。文章首先对应变技术测量轴承润滑膜的理论、试验装置、微机软硬件作了较为详细的介绍。还实测了几种润滑剂的轴承润滑膜厚度,并同理论计算结果进行比较。试验表明,采用本文介绍的实测方法和仪器,能较准确地判断轴承内部的润滑状态。     

基于TMS320VC5416的多路加速度采集系统设计

介绍了一种基于TMS320VC5416的加速度信号采集与处理系统设计方法.该系统采用AD73360作为数据采集前端,通过DSP的McBSP和AD73360级联,可实现多路模拟加速度信号的实时采集和处理.     

常温直流对靶溅射制备高TCR氧化钒薄膜

常温下用直流对靶磁控溅射的方法在玻璃基片上制备出了高电阻温度系数（TCR）氧化钒薄膜．通过设计正交试验，系统分析了Ar和O2的标准体积比、溅射功率、工作压强和热处理时间对氧化钒薄膜TCR的影响．对最佳工艺条件下制得的薄膜进行电阻温度特性测试，TCR达到-3．3％／K，室温方块电阻为28．5kΩ，个别样品的TCR达到-40%／K以上．扫描电子显微镜（SEM）和原子力显微镜（AFM）的形貌分析显示，这种制备方法结合适当的退火可以制备出氧化钒多晶薄膜，晶粒尺寸在纳米数量级．X射线光电子能谱（XPS）分析发现，高TCR薄膜样品中钒的总体价态接近＋4价．所有结果表明，制得的氧化钒薄膜电性能满足红外探测器的要求，且该工艺能与CMOS工艺兼容．     

A Fingerprinting Method Based on Module Extraction Used to Protect Intellectual Property

Intellectual Property （IP） reuse methodology has been widely used in Integrate Circuit （IC） design. Meanwhile, the corresponding security problems caused by illegal IP distribution have aroused lots of attentions. Unlike using IP watermark to identify IP＇s ownership, IP fingerprinting can be used to trace illegal distributor. In this paper, IP buyer＇s fingerprint is mapped into different derived instances of extracted modules, and then is embedded into IP to identify distributor in case of illegal distribution. Comparing with other fingerprinting method, the proposed method has some good characteristics such as low design effort, small storage demand, high security and few physical overheads.