用B样条曲线构造几何物体模型的方法

根据Ｂ样条曲线原理,提出了先用若干个截平面去切割几何物体,得到一组与几何物体轮廓线相交的点。根据这些点,再用Ｂ样条曲线去构造几何物体的近似轮廓线,从而得到几何物体模型。该方法方便、精确,便于在计算机几何造型系统中应用。     

近炸引信炮口保险距离的计算

该文以国外某舰炮弹药无线电近炸引信为例,分析研究了该无线电近炸引信炮口安全保险距离有关的参量,通过对火药燃烧时间和电路延迟时间的计算推出了几种不同情况下该无线电近炸引信炮口保险距离,分析计算方法具有普遍性。     

基于Access公路工程机械数据库开发

介绍了Ｗｉｎｄｏｗｓ９５／ＮＴ下的数据库管理与开发平台Ａｃｃｅｓｓ的特点,论述了如何利用ＯＬＥ等手段来提高工程数据库的开发效率与质量,并结合公路工程机械数据库的开发实例,完成了各类别公路机械数据库建立、事务关系处理、实时检测数据分析处理、网络管理等工作．     

ATM广域网预测式流量控制方案

针对ＡＴＭ广域网的长时延特点,提出了一种预测式流量控制方案,通过预测各交换节点非受控业务流所占用的带宽,对各链路可获得带宽进行预测式分配;预测式方案结合本文作者提出的集中式流量控制机制,保证了带宽分配的公平性和链路利用的高效性;本文还在ＶＢＲ＋ＡＢＲ业务综合传输的情形下,进行了预测式流量控制方案的计算机仿真,仿真结果表明,本文的预测式算法具有带宽分配的公平性和链路利用的高效性,交换节点处缓冲队列很     

并殖吸虫第二中间宿主一新种——平和华溪蟹(十足目:短尾派)

本文记述了采自福建省平和县的淡水蟹华溪蟹属Sinopotamon一新种——平和华溪蟹S.pinheensesp.nov;蟹体内并殖吸虫囊蚴感染率为100％(21/21)。     

携带并殖吸虫囊蚴的华溪蟹新亚种报告(十足目:短尾派)

本文报道了充当并殖吸虫第二中间宿主,分布于福建省霞浦、福安、寿宁、福鼎、拓荣县(市)的淡水华溪蟹,经鉴别,均非福建华溪蟹(Sinopotamon fukienense),而是浙江华溪蟹新亚种Sinopotamon chekiangensemindongense subsp,nov.,澄清了蟹种分类。     

Comprehensive evaluation of mechanism of “chimney effect” using principles of magnetism, geochemistry and mineralogy

Study of forming mechanism of "chimney-effect" (CE) has important significance for basic theory and applications of non-seismic geophysical and geochemical methods locating oil/gas reservoirs. The theoretical basis of comprehensive evaluation of mechanism of CE using principles of magnetism, geochemistry and mineralogy has been reviewed, with the problems to be solved: (ⅰ) study for the relationship between process of oil/gas migration and geochemical field; (ⅱ) analysis of genesis of magnetic, geochemical and mineralogical anomaly; (ⅲ) interpretation of surface soil magnetism and geochemical anomaly combined with seismic data.     

一类二阶非线性微分方程解的性质

在一定条件下,研究了一类二阶非线性微分方程解的性质,分析了其解的单调性、振动性以及其解有界的充分必要条件,并讨论了其解在单调有界的条件下当ｔ→＋∞时的渐近性质。     

Preparation of enantiomerically pure 1,1′-bi-2-naphthols from 85% cinchonine and 1,1′-bi-2-naphtholboric anhydride

A possibility of preparation of enantiomerically pure 1,1′-bi-2-naphthols using an impure cinchonine has been examined. The solid and the mother liquor formed from the reaction of 1,1′-bi-2-naphtholboric anhydride and 85% cinchonine in toluene could give optically pure (S)-(−)- and (R)-(+)-1,1′-bi-2-naphthol after acidification and kinetic crystallization, the overall yields were 40% and 28%, respectively. Supported by the National Natural Science Foundation of China (2937206) and the Natural Science Foundation of Hubei Province (93J27) Xiong Ying, born in 1971, Graduate student     

大景深周视全息术的理论探讨

根据旋转光楔多重全息术理论,从理论上探讨一种适合拍摄同时再现的大景深周视全息图的方法．