大跨度屋盖结构等效静力风荷载数值计算方法

基于大跨度屋盖结构等效静力风荷载计算的复杂性,提出了极值效应等效静力风荷载的概念和应用数值优化原理计算大跨度屋盖结构内力等效静力风荷载的方法.以几内亚体育场主看台悬挑屋盖为例,计算得到其位移等效静力风荷载;以巴哈马体育场主看台悬挑屋盖为工程背景,基于两类不同目标函数按最小二乘拟合得到内力等效静力风荷载.并分别给出两组内力等效静力风荷载作用下的杆件极值内力误差分布,分析了基于两类目标函数的拟合方法各自的优缺点.算例与分析表明该方法实用性很强,既方便设计使用,又有相当高的精度,可以满足工程设计的需求.     

XZY-YZX型三自旋相互作用对横场XX自旋链中经典和量子关联的影响

借助于严格对角化方法,数值研究了具有XZY-YZX型三自旋相互作用的横场XX自旋链中经典和量子关联,讨论了三自旋相互作用对关联的影响,发现经典和量子关联在量子相变的临界点都具有奇异性.不同于横场中的量子Ising链,经典和量子关联对外场的导数没有尺寸效应.此外,在外场等于零的退化条件下,两个近邻自旋之间的总关联均分为经典和量子部分,并得到与文献一致的量子关联的行为.     

The new application of multilevel method of moments in analysis of wire-antenna arrays

This paper introduces the principle of the multi-level method of moments (MoM) and its application in the analysis of the wire-antenna arrays. The multi-level MoM broadens the usage of the iterative methods in the MoM. Our numerical results show that when applying it to the wire-antenna array analysis with the consideration of the mutual coupling between elements, it can allow a rapid and accurate evaluation of the current distribution on the antennas, and the computational cost is less, especially when the number of antennas is large. Jin Qi: born in 1974, M. S. student     

诱发电场影响骨重建的临床观察初步

本文将电磁场对骨折愈合的影响做了临床观察，得到了相应结果。     

格构式塔架动力风荷载解析模型

基于高频底座天平测力风洞试验, 得到了三种典型的格构式塔架的顺风向、横风向与扭转向一阶振型广义荷载谱与均方根广义力系数.在此基础上,利用最小二乘法拟合,建立了格构式塔架的一阶振型广义风荷载谱解析模型.该模型与风洞试验结果吻合较好,可在此基础上建立格构式塔架二维或三维动力响应的频域计算方法.     

Polarization measurement of Auroral Kilometric Radiation by INTERBALL-2 satellite

Preliminary analyses of low and high resolution data are presented from the polar plasma waves measured on board INTERBALL-2 satellite in three frequency bands: ELF (5–1000 Hz), VLF(1–20 kHz) and LF (20–260 kHz). The propagation and polarization characteristics of the Auroral Kilometric Radiation (AKR) emission are estimated and studied. The obtained result shows that R-X and L-O modes of AKR emission just above source regions are found. The propagation characteristics are also determined: wave normal directions weakly oblique or quasi-parallel to the earth magnetic field direction. Supported by the National Natural Science Foundation of China Zhao Zhengyu: born in 1952, Doctor, Associate professor     

微处理器段高速缓存器加载算法及设计

段高速缓存器加载是微处理器保护方式下多任务调度、虚拟段式存储器管理及指令集使用频度较高的部分。文中探讨了段高速缓存器加载的数据结构和定义 ,给出了保护方式下段高速缓存器加载算法 ,提出了用于段高速缓存器加载的保护测试单元的细胞群结构。最后 ,用 EDA工具SYNOPSYS对段高速缓存器加载算法的微程序和段高速缓存器加载的保护测试单元 RTL级的 VHDL描述进行了综合与仿真 ,验证了其设计的正确性与有效性     

论资源整合矿井优质资源复采工艺

简要介绍了对资源整合矿井优质资源复采工艺的预想,对复采工作存在的优势进行了描述,对存在的问题进行了分析。     

The new application of multilevel method of moments in analysis of wire-antenna arrays

This paper introduces the principle of the multi-level method of moments (MoM) and its application in the analysis of the wire-antenna arrays. The multi-level MoM broadens the usage of the iterative methods in the MoM. Our numerical results show that when applying it to the wire-antenna array analysis with the consideration of the mutual coupling between elements, it can allow a rapid and accurate evaluation of the current distribution on the antennas, and the computational cost is less, especially when the number of antennas is large. Jin Qi: born in 1974, M. S. student     

多连通域Voronoi图生成算法的研究

Voronoi图作为一种重要的计算机图形学技术,在数控加工、机器人的运动规划和曲面生成等许多领域都有广阔的应用前景.研究了由直线和圆弧组成的平面多连通域Voronoi图的生成算法,提出了平面闭包的搜索算法与闭包的归一化方法,根据单连通域Voronoi图的生成算法实现了多连通域Voronoi图的构造.实践证明了上述算法的有效性与可行性.