一种新的空间索引结构

根据空间数据库的查询要求，本文构建了一种新的空间索引结构（MC树），并给出了MC树的性质和相关更新算法。     

基于GSM／CDMA网络的GPS船舶定位系统

基于GSM网络的短信、GPRS数据传输和CDMA网络CDMA1X的数据传输技术，结合电子地图和船载定位GPS雷达，针对定位、调度、安全等因素需求，对比较大的船舶位置信息服务提出了一种解决方案。其中包括了GPS雷达的设计、监控服务器和分监控中心的设计，各个模块之间的通信协议的设计。该系统建成后，对船舶动态实施了有效监控。     

Experimental studies on electrical breakdown field strength of electrode with water mist containing MC additives

Water mist is one of the effective candidates for halon replacement used in electrical environment fire protection. Water mist additives may greatly enhance fire suppression effectiveness. In electrical environment, electrical breakdown field strength （E） is one of the important factors that control the performance of electrical equipment. In this study the variation principles of electrical breakdown field strength and the electricai characteristics of MC additives were investigated by electrode discharging experiments. Experimental results showed that electrical breakdown field strength was impacted obviously by the conductive metal ions and insulated fluorocarbon surfactants in MC additives. The attenuation percentages of E in different experimental cases were described, thus providing scientific guidance for the use of water mist and MC additives in electrical fire suppression.     

基于极值理论和Copula的灾难风险建模研究

利用极值理论中的广义极值分布(GEVD)对单一灾难事件的特性进行刻画，然后利用Copula函数把不同的灾难风险组合起来，构造其联合分布，并提出了适合模型的蒙特卡罗算法．最后利用实例说明了GEVD-Copula组合建模的应用，得出了有益结论。     

一种新的MC-CDMA系统频偏估计算法

频偏估计是多载波扩频系统的关键技术之一，但仅靠循环前缀只能估计较小的频偏。在循环前缀的基础上，介绍了一种采用插入同步码的方法来完成多载波码分多址MC－CDMA系统大频偏估计的算法，导出了频偏检测器的结构，根据此结构进行了计算机仿真。仿真结果表明采用部分快速傅里叶快速（FFT）来完成大频偏的正确估计性能良好。     

浇铸尼龙－6的结晶与熔融

用ＤＳＣ法研究了Ｌａ＿２Ｏ＿３和Ｙ＿２Ｏ＿３对浇铸尼龙－６（ＭＣ尼龙－６）结晶与熔融的影响。二者都使ＭＣ尼龙－６熔体等速降温的结晶温度Ｔ＿ｃ升高、等速升温的溶点Ｔ＿ｍ降低、结晶度Ｘ＿ｃ降低，拉伸过程的断裂能密度及断裂伸长率提高。Ｌａ＿２Ｏ＿３使ＭＣ尼龙－６平衡熔点只降低，结晶速率增加，结晶完善程度变差。Ｙ＿２Ｏ＿３使ＭＣ尼龙－６的升高，它可显著改善ＭＣ尼龙－６的耐热性。     

New method of producing mono-sized polymer gel particles using microchannel emulsification and UV irradiation

It has been established that the combination of microchannel (MC) emulsification and UV-induced gelation is quite effective in producing mono-sized gel particles from acryloyl-type monomer/polymer solutions. MC emulsification allows one to produce the monomer solution droplets with less than ca. 5% relative standard deviation. On the other hand, using UV-induced gelation technique, pre-gel droplets containing a photoinitiator gelate by irradiation of UV light for a few minutes without requiring heating and/or intermediate adding of reaction accelerator. Conveniently, the particle size is adjusted from a few m to ca. 100-m by changing the slit size of the MC plate. Furthermore, gel particles may contain a variety of materials, such as metals, pigments, dyes, oils, bubbles, or others, suggesting various potential industrial applications.     

无活化剂存在时己内酰胺碱催化聚合及高延伸铸型尼龙的制备

研究了在无活化剂存在时己内酰胺的碱性催化聚合反应。实验结果表明当聚合温度在190—220℃范围时制备的铸型尼龙其断裂伸长率在200％以上,最高达363％。并具有高耐冲击性能。与一般铸型尼龙相比较,该高延伸铸型尼龙具有较低的抗张强度、弹性模量、熔点、玻璃化转变温度、密度和结晶度。     

浇铸尼龙—6的结晶与熔融

用ＤＳＣ法研究了Ｌａ２Ｏ３和Ｙ２Ｏ３对浇铸尼龙－６（ＭＣ尼龙－６）结晶与熔融的影响，二者都使ＭＣ尼龙－６熔体等速降温的结晶温度Ｔｅ升高，等速升温的溶点Ｔｍ降低，结晶度Ｘｃ降低，拉伸过程的断裂能密度及断裂伸长率提高，Ｌａ２Ｏ３使ＭＣ尼龙－６平衡熔点Ｔｍ降低，结晶速率增加，结晶完善程度变差，Ｙ２Ｏ３使ＭＣ尼龙－６的Ｔｍ升高，它可显著改善ＭＣ尼龙－６的耐热性。     

Direct minimization of the energy functional in LCAO-MO density matrix formalism

A general theory is presented for the optimization of the coefficients of orbitals and configuration interaction expansion in the case of multiconfiguration wavefunctions containing all single excitations. The orbital coefficients are optimized by suitable orthogonal transformations of the atomic basis; the Cl coefficients are determined solving the usual secular problem. The energy minimization is performed directly by a gradient approach. The method works both for ground and excited states and no convergence difficulties are met. Computational examples are given for H₂O and H₂S molecules.