基于子模型法的钢拱桥关键梁段精细化分析

针对某单跨钢拱桥,基于子模型方法,利用有限元软件ANSYS先进行全桥整体分析,得出所需边界条件,继而对关键梁段进行精细化建模,根据实际荷载情况进行加载,分析了关键梁段的空间应力分布状态以及局部稳定性.结果 表明:车行道与人行道关键梁段在最不利荷载工况作用下,其应力水平与稳定性均能满足规范要求.     

传感器在环自动泊车仿真测试系统设计

针对智能网联汽车自动泊车功能实车测试成本高、周期长、重复性差问题,基于硬件在环及计算机数值模拟仿真技术,以自动泊车传感、控制系统为主要测试对象,搭建实验室环境下传感器在环自动泊车仿真测试系统,借助美国国家仪器公司(National Instruments,NI)软硬件实时平台、CarMaker虚拟仿真场景软件模拟仿真自动泊车交互场景、车辆底盘动力学特性及超声波传感器特性,集成开发摄像头视觉注入板卡、超声波物理回波仿真板卡仿真模拟传感器物理信号,虚实结合构建了完整的传感器在环自动泊车测试验证环境.以某车型实车带自动泊车功能的智驾控制器、超声波传感器为被测对象,搭建垂直停车位场景对仿真测试系统进行测试验证,仿真实验结果证实测试系统能够为自动泊车提供安全、高效的测试验证平台,助力自动泊车控制算法开发.     

论区域可持续发展系统的三大关系

枢域可持发展系统是人地关系,区际关系,代际关系协调统一的区域－自然－社会复系统,人类对自然的利用改造,适应以及自然对人类的影响和反馈是人地关系的运行机制,地球伦理,限制消费,提高潜力,减少破坏是其协调原则;空间相互作用下“流”的形成发展以及人类调控下“流”的调协互补是区际关系关系的运行机制,公平分配资源,维护共同利益,补偿跨界影响,优化人地关系是其协调原则;社会伦理和社会进行是代际关系的运行机制,     

关于正交配置表构造中若干问题的探讨

对构造正交配置表的矩阵法和非矩阵法作了比较研究,结果表明非矩阵法在构造非对称性问题正交配置表时比矩阵法更简便、可靠、精确,并指出Ｍｉｃｈｅｌｓｅｎ和Ｖｉｌａｄｓｅｎ在讨论用非矩阵法构造对称性问题正交配置表时所存在的问题．同时讨论了正交配置矩阵所具有的各种特征．     

基于Intranet的企业远程监控系统

介绍了基于Ｉｎｔｒａｎｅｔ的企业远程监控系统的主要技术特点及其广阔的发展前景,并且介绍了企业实现远程监控管理的一个解决方案及应用实例     

取代胺烃基膦酸—磷酸氢锆载体及钯催化剂

制得17个N取代的胺甲基膦酸1a～f,2胺乙基膦酸2a～k.它们的无定形(胺烃基膦酸磷酸氢)锆载体Zr(HPO4)2-x[O3P(CH2)nNRR1]x·H2O3a～f,4a～k及其相应的钯催化剂5a～f,6a～k.用IR,TG,DTA和XPS对其进行表征.研究了钯催化剂5、6常压加氢活性的取代基影响并进行了讨论.结果表明,活性基团在载体表面的手柄增长有利于加氢反应的进行;N取代烃基体积增大增加空间位阻,催化加氢活性明显降低;N羟乙基取代显著降低催化加氢活性;胍基和氰乙基的引入形成了多龄配位,催化加氢活性均有增加     

Morphology of the medullary visceral zone

Since 1990, a series of studies on rats, monkeys and human foetus showed that an arc-shaped zone is present in the middle-caudal segment of medulla oblongata, running from the dorsomedi-al part to the ventrolateral part and passing through the reticular formation. It was named the medullary visceral zone (MVZ). The MVZ has been investigated with various techniques (Golgi method, Nissl method, immunohistochemical method, in situ hybridization method, triple labelling method, neuro-physiological method, etc.), and the morphological features as well as the physiological functions of MVZ have been preliminarily understood. It is proved that the medullary life center is located in MVZ. An introduction and some comments are given on the location of MVZ, its shape and extent, cytoarchi-tecture and chemicoarchitecture, afferent and efferent fiber connections and their functions, and its important physiological functions.     

Forming proper ensemble forecast initial members with four-dimensional variational data assimilation method

A method has been presented to improve ensemble forecast by utilizing these initial members generated by four-dimensional variational data assimilation (4-D VDA), to conquer limitation of those initial members generated by Monte Carlo forecast (MCF) or lagged average forecast (LAF). This method possesses significant statistical characteristic of MCF, and by virtue of LAP that contains multi-time information and its initial members are harmonic with the dynamic model, six groups of numerical control and contrast experiments were performed with T42 spectral 4-D VDA system. The results show that in dekad range ensemble forecast with initial members generated by this method is prior to that by LAP. The anomaly correlation coefficient (ACC) of 500 hPa height in 10-d average by employing this method is 0.01-0.04 larger than by LAP, and root mean square error (RMSE) less than 0.2-0.4 dagpm.     

医学超声动态图象的分区压缩技术

介绍了医学超声动态图象微小失真压缩研究中采用的分区压缩技术．它根据超声诊断临床经验和图象特征,将超声动态图象划分为病灶、结构图象区域及背景等图象．对病灶区域进行低压缩率的微小失真压缩,对结构图象区域的图象进行高压缩率的有损压缩,对背景则采取简单定时的游程编码压缩．实验证明它可提高超声动态图象的数据压缩比和降低计算运算量,取得了良好的效果     

多花猕猴桃的组织培养

介绍了多花猕猴桃的组织培养方法及其操作步骤。