粒子系统模拟自然景物的探讨

讨论粒子系统的构成，在随机处理的基础上，提出用粒子系统描述模糊、不规则物体的造型方法，给出了“雪”和“焰火”两个实例。     

超声波在氮酮合成中的应用研究

以CTMAB为固—液相转移催化剂,在超声波作用下,制得氮酮(Azone),实验结果表明,当反应温度为60±2℃时,在24kHz的超声波作用下,反应6h后氮酮的产率达70.2％～71.8％,较不使用超声波时缩短反应时间4h.产品折光率及红外图谱符合文献值。     

流体输送管道的超声检漏技术

超声检漏技术可以无损、快速、准确地检测出各种压力管道在输送液体或气体过程中所产生的泄漏位置。它既可对管道进行远距离检测定位,也可对压力容器、热交换器的密封性能进行检查.我们对泄漏所产生的声谱作了分析,发现通常泄漏产生的     

Zn2SnO4复合氧化物气敏特性研究

采用烧结法合成Zn_2SnO_4复合氧化物,具有反尖晶石结构的弱N型半导体材料,其气敏性能引人注目,尤其是对乙醇具有较高的灵敏度和选择性.当掺入少量氧化物杂质,可以看到灵敏度和最佳工作温度都有所改善,其中以稀土氧化物效果为最佳.     

阿拉伯与中国代数方程数值解法的比较研究──阿尔·徒思与宋元数学家比较的个案分析

该文以阿尔·徒思和宋元数学家为例,对阿拉伯与中国代数方程数值解法进行了比较研究,认为二者在方法的一般性和所讨论的根的范围上是相同的,而不同点则在于方程的布式和分类。他们分别受到各自传统开方法的启示,且又沿着不同的途径发展,即阿尔·徒思的整个计算程序力求和早期传统的开方法相吻合,而宋元数学家则对早期传统的开方术作了进一步推广和发展,沿着一条机械化、程序化的道路进展。该文还分析了为什么中国学者实现了由开高次方到高次方程数值解法的突破,而阿拉伯学者却未能实现突破的原因。     

BloomRouter： A Framework for Dissemination of Compressed XML Stream

As our best knowledge, in the Publish/Subscribe application environment, few research work has been done on the dissemination and routing of compressed XML （extended markup language） data. A high-speed compressed XML data routing and dissemination framework BloomRouter is proposed. In BloomRouter, a Bloom Filter based prefilte ring mechanism is used to filter out compressed XML elements that users do not care; after that an interval tree dis seminator forwards target elements to the corresponding end users by matching the incomming compressed XML elements with indexed users＇ query regions. Based on this framework, we can efficiently filter/query the compressed incoming XML data, and then route the query result to the corresponding subseriber.     

电阻炉温度微机控制系统的研制

以个人计算机为基础，以Ａ／Ｄ转换器为核心，并配以适当的外围接口电路，实现对电阻炉温度自动控制．设计了一种过零检测电路，将ＰＩＤ控制增量转换成占空比，并由数字电路输出有一定占空比的矩形波，利用硬件方法实现普通双向可控硅的同步过零触发从而实现功率可调     

江苏省常州市城市地价动态监测信息系统设计与实现

以常州市为例,介绍地价监测点的设立过程,并对城市地价动态监测信息系统的总体设计思路作具体阐述．系统运用迭代增量法,采用GIS控件MapX进行开发．该系统已在常州市国土资源局局域网上日常运行,并利用地价监测点资料自动编制常州市地价指数,用以分析、预测常州市地价变化的基本趋势,为科学管理和合理利用城市土地资源提供科学依据．     

Comparison of summer thermohaline field and circulation structure of the Bohai Sea between 1958 and 2000

TheBohaiSea(37°07′—41°N,117°35′—121°10′E)isashallowsemi-enclosedsea.SincetheBohaiSeaistheonlyinnerseaofChinaandalsoanimportantstra-tegicsea,itisoneofthemostinvestigatedseasinChina.Alargenumberofstudiesonthetideandthetidalcurrentaswellasnumericalsimulationofcirculationhavebeencarriedout,enhancingourunderstandingoftheBohaiSea.Long-termvariationsoftheseasurfacesalinity(SSS)andseasurfacetemperature(SST)oftheBohaiSeawereanalyzed.Linetal.[1]foundthatthepositivetrendsoftheannualmeanS…     

Infectious foot-and-mouth disease virus derived from a cloned full-length cDNA of OH／CHA／99

The China foot-and-mouth virus (FMDV) isolate OH/CHA/99 was isolated from swine, which was unable to infect bovine thyroid cells in vitro or to cause typical disease in bovines following intradermal inoculation in the tongue. To enhance antigenicity, replication, maturation and pathogenicity studies of OH/CHA/99, an infectious fulllength cDNA clone, designated pBIFMDV, was prepared. The in vitro and in vivo biological properties of the virus derived from pBIFMDV were studied by analyzing antigenicity, plaque morphology and virulence in pigs. The results showed that the virus derived from pBIFMDV had the same biological properties as the parent strain OH/CHA/99; the fulllength infections cDNA clone, pBIFMDV, will be very useful in studies of the antigenicity, virulence, pathogenesis, maturation and replication of FMDV.