底层大空间高层结构自由振动的模态综合解法

本文将模态综合法用于底层大空间高层建筑结构自由振动的计算,导出了框支剪力墙—落地剪力墙结构,框支剪力墙—落地剪力墙—壁式框架结构自由振动的计算公式,文末给出了算例.     

一种新型的CPU故障检测方法及其应用

本文根据国产新型单路数字新闻传真系统的特点,采用一种新颖而有效的 CPU 故障诊断算法.此方法的故障覆盖率较高,在程序运行后,得到令人满意的效果.     

Heritable and inducible genetic interference by double-stranded RNA encoded by transgenes

Double-stranded RNA interference (RNAi) is an effective method for disrupting expression of specific genes in Caenorhabditis elegans and other organisms. Applications of this reverse-genetics tool, however, are somewhat restricted in nematodes because introduced dsRNA is not stably inherited. Another difficulty is that RNAi disruption of late-acting genes has been generally less consistent than that of embryonically expressed genes, perhaps because the concentration of dsRNA becomes lower as cellular division proceeds or as developmental time advances. In particular, some neuronally expressed genes appear refractory to dsRNA-mediated interference. We sought to extend the applicability of RNAi by in vivo expression of heritable inverted-repeat (IR) genes. We assayed the efficacy of in vivo-driven RNAi in three situations for which heritable, inducible RNAi would be advantageous: (i) production of large numbers of animals deficient for gene activities required for viability or reproduction; (ii) generation of large populations of phenocopy mutants for biochemical analysis; and (iii) effective gene inactivation in the nervous system. We report that heritable IR genes confer potent and specific gene inactivation for each of these applications. We suggest that a similar strategy might be used to test for dsRNA interference effects in higher organisms in which it is feasible to construct transgenic animals, but impossible to directly or transiently introduce high concentrations of dsRNA.     

甘孜州旅游产业竞争优势的构建

随着旅游业的发展，旅游业竞争不再是仅仅立足于旅游资源优势基础之上的低层次竞争，而是在旅游产品质量、品牌、服务等方面的综合和高层次竞争．区域旅游业的发展过程实质上就是区域旅游产业整体竞争力不断提高的过程．在介绍比较优势原理和产业竞争优势原理的基础上，分析甘孜州旅游产业构成要素所具有的优势和劣势，最后提出构建甘孜州旅游产业竞争优势的建议．     

备课平台的测试研究

计算机多媒体技术辅助教学，已得到广泛的普及与应用。本文介绍了如何比较各种制作备课软件工具的性能，以及在实践中的应用，最后比对出一种操作简单，使用简便的FIN eskool的教师专业备课软件。并对该软件主要功能进行介绍，以求共享。     

一种新型的FIR滤波器

在原有FIR滤波器结构的基础上给出全相位数字滤波器的结构，推导出了全相位数字滤波器的输出公式，并用实验证明全相位滤波器具有良好的滤波频率特性。     

Object-Oriented Design for FDTD Visual Scientific Computing

COMPUTER DEVELOPMENT AND APPLICATION1. INTRODUCTIONFinite-difference time-domain (FDTD) method 11] is widely used in the numerical simulation of electromagneticfields, especially when calculating the radistion from a coIDPlex system or the scattering of complex structure. The proposition of perfectly matched layer (PML) absorbing boundary colldition [31 is regarded as abreakthrough of FDTD method, it brillgs more and more people to pay their attention.Unfortunately) due …     

一类周期微分系统的同期解

本文研究了一类周期微分系统的周期解的存在性问题,利用不动点方法,得到了此类系统存在周期解的充分性条件。所得结果推广了文[1]的主要结果。     

计入摩擦力和惯性力的三叉式万向联轴器受力分析

针对工程实际,对同时计入摩擦力和惯性力作用下的三叉式万向联轴器的受力提出了一种分析模型.利用此模型建立了既简单又实用的三叉式联轴器的力学表达式,并结合实例对这种联轴器的受力进行了数值分析.力分析的结果可为轴承的设计提供理论依据和参考,其简化的计算公式为工程计算提供了方便.     

大量铜汞存在下银的阳极溶出伏安法测定

本文提出了在氨三乙酸(NTA)——乙二胺四乙酸(EDTA)(NH_3)体系中进行银的阳极溶出伏安法测定,排除了数千倍的汞(Ⅱ)、铜(Ⅱ)的干扰,测定下限可达0.002μg·ml~(-1),变异系数≤8%,回收率在80%～117%之间。