N-芳基-5,7-二甲氧基-1,2,4-三唑并嘧啶磺酰胺的合成

以N-(2-氯苯基)-5-氨基-1，2，4-三唑-3-磺酰胺和N-(2，6-二氯苯基)-5-氨基-1，2，4-三唑-3-磺酰胺为原料，与丙二酰氯(由丙二酸与三氯氧磷反应得到)进行环合，分别制得N-(2-氯苯基)-5，7-二氯-1，2，4-三唑[1，5-a]嘧啶-3-磺酰胺和N-(2，6-二氯苯基)-5，7-二氯-1，2，4-三唑[1，5-a]嘧啶-3-磺酰胺。然后，用甲氧基取代嘧啶环上的氯原子得到78．7％N-(2-氯苯基)-5，7-二甲氧基-1，2，4-三唑[1，5-a]嘧啶-3-磺酰胺和70．8％N-(2，6-二氯苯基)-5，7-二甲氧基-1，2，4-三唑[1，5-a]嘧啶-3-磺酰胺；产品结构经元素分析，IR和^1HNMR谱确定。     

Semi-solid slurry preparation and rolling of 1Cr18Ni9Ti stainless steel

The preparation and rolling of the semi-solid slurry 1Cr18Ni9Ti stainless steel were researched. The experimental results show that when stirred for 2-3 min under the given test condition, the semi-solid slurry with about 50%-60% (volume fraction) solid and the spherical primary austenitic grains in the size of 100-200μm can be obtained, and it is easy to be discharged from the bottom little hole of the stirring chamber. The semi-solid slurry of 1Cr18Ni9Ti stainless steel can be rolled into the given plate successfully. However, the solid phase and liquid phase are easily separated in the rolling process, so that the solid primary austenitic grains are concentrated in the center and the liquid phase is near the edge of the rolled plate. The strengths of the plate rolled in the semi-solid state are higher than that of the traditionally repeated hot-rolled plate of 1Cr18Ni9Ti stainless steel.     

人参皂甙-α-鼠李糖苷酶分离提纯及其酶性质

主要研究微生物sp.G9产皂甙鼠李糖苷酶的分离提纯及其酶性质。该酶能够水解人参皂甙Re的C 6位末端上的一个α 鼠李糖基,从而制备人参皂甙Rg1。该酶蛋白的分子量约为54kDa,且酶反应的最佳温度是40℃,最适pH值是5。     

iButton技术在安防系统中的应用

本文介绍了一种新型的智能化信息载体iButton以及iButton在安防系统上的应用举例，着重介绍了其硬件、软件设计及工作原理。     

Robust matrix 𝒟U‐stability analysis

In this paper, the problem of robust matrix root‐clustering is addressed. The studied matrices are subject to both polytopic and unstructured uncertainties. An original point is the large choice of clustering regions enabled by the proposed approach since these regions can be unions of possibly disjoint and non‐symmetric subregions of the complex plane. The precise purpose is, considering a specified polytope, to determine the greatest robustness bound on the unstructured uncertainty such that robust matrix root‐clustering is ensured. To reduce conservatism in the derivation of the bound, the reasoning relies on a framework based upon parameter‐dependent Lyapunov functions. The bound value is computed by solving an ?? ?? ? problem. Copyright © 2003 John Wiley & Sons, Ltd.     

Multi-symplectic methods for the coupled 1D nonlinear Schrödinger system

In the paper, the multi-symplectic formulation of the coupled 1D nonlinear Schrödinger system (CNLS) is considered. For the multi-symplectic formulation, a new six point scheme, which is equivalent to the multi-symplectic Preissman integrator, is derived. We also present numerical experiments, which show that the multi-symplectic scheme has excellent long-time numerical behaviour and energy conservation property.     

我国资源一号卫星资料应用成果显著

中巴地球资源卫星发射成功已三年多,中国资源卫星应用中心为卫星遥感研究与应用单位共提供八千多景数据(预约订购一万四千多景)。许多应用研究成果达到了较高的水平,具有一定的深度和广度。部分应用研究成果已纳入了遥感应用的运行性系统,这表明中巴地球资源卫星资料在国民经济和社会发展中正在发挥重要作用。     

嵌入式网络化多媒体视频监控系统的设计与实现

本文介绍了一种嵌入式网络化多媒体视频监控系统的实现方案，着重描述了其中MPEGl解码器的软件实现方法井对MMX、SSE技术在多媒体解码过程中的应用进行了详细分析。     

细纱工序4M1E对纱线毛羽的影响与控制

在环锭纺纱系统中,细纱工序是产生纱线毛羽的主要工序.本文介绍了毛羽的概念、分类、考核指标及对织物的影响,分析了细纱工序纱线毛羽的形成原因,并通过一系列实验,论述了人、机器、原料、方法、环境等因素对纱线毛羽的影响及相应的控制措施.     

0—1整数规划在科技项目管理中的应用

1 前言电子政务建设中涉及到宏观规划、财政预算、项目立项、政府采购等诸多智能决策支持问题,这些决策问题都带有若干制约条件,比背包问题要复杂得多,但其最终目的都是要寻求一种好的方案,以较少的投资产生最大的效益。本文以政府决策中的科技计划项目立项决策为例,探讨这类问题的一种可行的实用解决方案。