FeCoNbSiB块体非晶合金的铜模铸造及结构表征

本文以低纯硼铁合金为主要原料,用铜模铸造的方法制备出FeCoNbSiB块体非晶合金。用差示扫描量热分析（DSC）、X射线衍射（XRD）透射电电子显微镜（TEM）对合金的热物理性能及合金的结构进行了表征。并结合形核理论讨论了合金的玻璃形成能力。     

并行测试技术在自动测试系统中的应用

并行测试拥有减少测试时间、降低测试成本的强大优势,正成为研究热点之一。首先详细分析了并行测试的基本概念,介绍了目前实现并行测试可以采用的两大类4种结构,对这4种结构各自的优缺点进行了比较。接着以多线程并行测试程序为例描述了并行测试程序中同步、异步和单线程的三种模型,最后重点对多线程并行测试实现中几个值得注意的重要问题进行了讨论。     

Hydrothermal synthesis of ultrathin ZnO nanosheets and their gas-sensing properties

Gas-sensing performances can often be enhanced significantly once the size of sensing nanomaterials approaches a critical value of 15 nm. Here, we synthesize, by a simple hydrothermal method accompanied by the calcination process, ultrathin ZnO nanosheets with a thickness as thin as 10–13 nm. We find that the prepared zinc hydroxide carbonate precursor is largely agglomerated, yet transformed to the ultrathin ZnO nanosheets in a dispersive fashion after the calcination process. The as-prepared ultrathin nanosheets exhibit excellent gas-sensing functions to ethanol gas at the optimal temperature as low as 300 °C under the concentration of 50 ppm, rendering them a promising sensing material for the on-site detection of ethanol.     

Preparation and characterization of magnetic poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) microspheres

In this article, nano-magnetite particles (ferrofluid, Fe₃O₄) were prepared by chemical co-deposition method. A series of biodegradable triblock poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) (PCL-PEG-PCL, PCEC) copolymers were synthesized by ring-opening polymerization method from ε-caprolactone (ε-CL) initiated by poly(ethylene glycol) diol (PEG) using stannous octoate as catalyst. And the magnetic PCEC composite microspheres were prepared by solvent diffusion method. The properties of the ferrofluid, PCEC copolymer, and magnetic PCEC microspheres were studied in detail by SEM, VSM, XRD, Malvern Laser Particle Sizer, ¹H-NMR, GPC, and TG/DTG. Effects of macromolecular weight and concentration of polymer, and the time for ultrasound dispersion on properties of magnetic microspheres were also investigated. The obtained magnetic PCEC microspheres might have great potential application in targeted drug delivery system or cell separation. This work was financially supported by Chinese Key Basic Research Program (2004CB518800 and 2004CB518807), and Sichuan Key Project of Science and Technology (06(05SG022-021-02)). Qian ZY and Wang H did the even work with Gou ML, and are the co-first authors for this paper.     

僵尸网络的防御与控制

僵尸网络对网络安全运行及用户数据安全都是极具威胁的隐患,它也因此成为一个国际上十分关注的问题.明确僵尸网络的概念,把握僵尸网络的产生、内部工作机理、发展、类型及危险性,就能主动、有效地做好对僵尸网络的防御与控制,强化网络运行及用户数据的安全性.     

Fine Mapping and Functional Analysis of Major Regulatory Genes of Soluble Solids Content in Wax Gourd (Benincasa hispida)

Soluble solids content (SSC) is an important quality trait of wax gourd, but reports about its regulatory genes are scarce. In this study, the SSC regulatory gene BhSSC2.1 in wax gourd was mined via quantitative trait locus (QTL) mapping based on high-density genetic mapping containing 12 linkage groups (LG) and bulked segregant analysis (BSA)-seq. QTL mapping and BSA-seq revealed for the first time that the SSC QTL (107.658–108.176 cM) of wax gourd was on Chr2 (LG2). The interpretable phenotypic variation rate and maximum LOD were 16.033% and 6.454, respectively. The QTL interval contained 13 genes. Real-time fluorescence quantitative expression analysis, functional annotation, and sequence analysis suggested that Bch02G016960, named BhSSC2.1, was a candidate regulatory gene of the SSC in wax gourd. Functional annotation of this gene showed that it codes for a NADP-dependent malic enzyme. According to BhSSC2.1 sequence variation, an InDel marker was developed for molecular marker-assisted breeding of wax gourd. This study will lay the foundation for future studies regarding breeding and understanding genetic mechanisms of wax gourd.     

基于设计树模板的产品外观风格定制研究

为满足客户对产品外观的个性化定制需求,提出了产品外观风格特征的量化描述方法,构造了设计树来组织和管理设计方案的几何数据信息和风格信息,并给出了产品外观模板的形式化描述和建立方法。在此基础上,建立了基于设计树模板的产品外观风格定制系统的模型,介绍了基于CAD平台二次开发的、COM组件结合中间件的开发方案。     

USB2.0接口芯片CY7C68013的固件程序开发

USB2．0接口技术为外设与主机之间提供了一种灵活高效的双向数据通道。可广泛地应用于数据采集、工业控制和消费数码等方面。本文简要介绍了支持USB2．0协议的接口芯片CY7C68013的结构。分析了CY7C68013芯片的固件程序框架的结构。给出了如何在该固件程序框架下使用C语言进行固件程序开发的方法。     

基于ArcEngine和C/S构架的矿产资源管理系统开发

基于组件式GIS（Geographical Information System）思想,在Java平台下,以Oracle为后台数据库,通过以下技术的实施：ArcEngine实现地图表现、Java存储过程实现Oracle远程逻辑备份与恢复、ArcSDE实现空间数据存储,成功开发了攀枝花市矿产资源管理系统,并取得良好应用效果。系统的应用和实践促进了该市矿政管理信息化建设进程。     

一种可展宽频带的U型切角天线

设计了一种可展宽频带的U型切角天线。将U型贴片天线进行切角处理,改变天线的结构与电流路径,可以有效展宽天线频带,并使其具有良好的阻抗匹配特性。采用HFSS15.0软件对天线模型进行仿真分析,对切角的长度、宽度进行优化,给出了天线的反射系数S11与U型槽尺寸和切角尺寸间的关系。结果表明,优化后的U型切角天线覆盖了整个2.4~2.5 GHz频带范围,电压驻波比VSWR≤2的相对带宽为19%,天线增益达到7 dB,波束宽度为83o左右。