维生素B1—金属配合物的制备及其分子结构

制得了M(th)Cl_3 (M=Zn(Ⅱ)、Cd(Ⅱ)、Mn(Ⅱ)、Co(Ⅱ))、Cu(thH)Cl_4和Hg_3(C_(12)H_(16)N_4OS)Cl_8三种类型的维生素B_1-金属配合物。结构表征表明,Zn、Cd、Mn、Co配合物属M—N配位型,Cu配合物属离子型,Hg配合物既有M—O键合,又有离子键存在。     

FT中的OS失效及应对措施

科学技术的进步促使集成电路产业迅猛发展，“摩尔定律”还在继续着它的预言，集成电路变得日益“娇小”，但单块硅芯片上所集成的晶体管数目却数量惊人，实现的功能更为强大，如何判断功能复杂的芯片是否实现预期的效果成为IC产业中非常重要的步骤。作为集成电路产业链中重要的一环：测试也是机遇和风险并存。Final Test是集成电路投入市场前的重要环节，测试结果的真实性、可靠性将直接影响到供应商的销售利润及公司声誉。文章抛开那些复杂的测试项目，分析了Final Test中常见的0S（Open／Short）失效案例及其应对措施。     

Relativistic virial theorem for atoms

A relativistic virial theorem is derived for atoms in a general manner. The virial ratio consists of the usual V/T term and a correction term W/T, where T, V, and W are the kinetic energy, the potential energy, and correction terms, respectively. Explicit forms of W are presented for four specific nuclear potential models. Numerical calculations for a uniform nuclear charge model show that the magnitude of the correction term W/T increases with increasing atomic numbers and that it modifies the ratio V/T considerably for atoms with large atomic numbers in particular. Received: 21 November 2000 / Accepted: 8 January 2001 / Published online: 3 April 2001     

基于NUT/OS的DTU模块设计与开发

介绍了一种在ATmegal28L单片机上通过NUT/OS实时操作系统控制GPRS Modem来实现INTERNET接入的DTU模块设计方案.在介绍NUT/OS实时操作系统的基础上,阐述DTU模块的硬件设计和软件设计,其中详细解释了CPU及GPRS模块的选择和电源电路设计,并说明网络结构和程序流程.实践表明,该DTU模块很好地实现了无线网络的数据传输,具有可靠性高,功耗低、运用广泛等特点.     

基于QNX操作系统环境下的多进程编程与调试

简述了进程和多进程的概念,对进程间资源共享问题作了详细的分析,并就多进程的调试作了详细的说明。     

基于STi7109平台的LwIP的移植与优化

随着数字电视的发展,高清电视机顶盒的需求会越来越大,而数字电视和IPTV的融合要求电视机顶盒要有较好的网络性能。ST平台的OS20/OS21操作系统不具备TCP/IP网络协议栈,为此,本文给出了轻量级网络协议栈LwIP在STi7109平台上的移植方案。实验表明,经过优化,LwIP在STi7109上能够获得较好的性能。     

分时调度思想在单片机应用中的一个实例

利用分时操作系统中的分时调度思想可以使一个多终端的系统快速响应各终端的要求。本文首先介绍分时操作系统中的分时调度思想,然后以程控交换机的控制系统为例．在简介控制系统功能的基础上对用户的实时性要求进行分析．论证了分时调度思想的可行性,并利用该思想进行软件流程设计,用ATMEL89S51替代原PC机完成控制,实现程控交换机的各种功能。     

DC/OS关键技术与应用场景

首先对数据中心操作系统内的主要技术,包括Mesos、Yarn、Kubernetes和容器进行了阐述。根据国内外电信运营商的现状和面临的问题,提出了一种解决方案,并对技术实现及选型建议进行了讨论。最后对电信运营商应用DC/OS关键技术的案例进行了简要介绍。     

Live Imaging of Glucose Homeostasis in Nuclei of COS-7 Cells

Measuring subcellular glucose levels deep in tissues can provide new insights into compartmentalization and specialization of glucose metabolism among different cells. As shown previously, a FRET-based glucose-sensor consisting of two GFP-variants and the Escherichia coli periplasmic glucose/galactose binding protein was successfully expressed in the cytosol of COS7-cells and used to determine cytosolic glucose levels. Recording cytosolic fluorescence intensities in cells located in deeper layers of tissues is often difficult due to loss of signal intensity caused by effects of other cell layers on excitation and emission light. These interfering effects may be reduced by restricting fluorophores to occupy only a fraction of the assayed tissue volume. This can be accomplished by confining fluorophores to a sub-compartment of each cell in the tissue, such as the nucleus. The glucose-sensor was targeted to nuclei of COS7-cells. To determine, whether nuclear glucose levels can be used to track cytosolic changes, nuclear glucose concentrations were quantified as the cells were challenged with external glucose over a range of 0.5 to 10 mM and compared to cytosolic levels. Internal glucose concentrations in both compartments were similar, corresponding to approximately 50% of the external concentration. Taken together, these results indicate that nuclear glucose levels can be used to determine cytosolic levels indirectly, permitting more reliable quantification of fluorescence intensities and providing a tool for measurements not only in cell cultures but also in tissues.     

基于QAMi5516设计的DVB-C数字电视机顶盒

介绍基于STMicro公司的最新一代单片式有线数字电视机顶盒芯片QAMi5516和嵌入式实时操作系统STLite/OS20设计的DVB-C数字电视机顶盒的总体方案,阐述DVB-C数字电视机顶盒的软硬件设计方法,给出DVB-C数字电视机顶盒的性能测试结果。