灭滴灵治疗智齿冠周炎的临床观察

本文对１０００例智齿冠周炎的患者采用三种治疗方法．其中一种单独给予口服灭滴灵，一种给予肌注青霉素．另一种则采用灭滴灵十肌注青霉素治疗．结果显示：三种治疗方法的疗效无显著差异．而灭滴灵有口服方便，安全，副作用少之优点．     

否定毛细永动机的唯象理论

本文从毛细现象自身所满足的规律、弯曲液面所具有的性质着手，给出了一种否定毛细永动机的唯象理论。     

高新技术开发区网络管理系统的设计

根据高新技术产业开发区的特点，提出了一系列有针对性的软、硬件设计。     

论害虫综合治理(IPM)中的容忍哲学

“容忍哲学”是 IPM 理论最具特色的基本概念,是害虫防治策略上的重大观念更新。从“消灭哲学”到“容忍哲学”的转变,是害虫防治策略上质的飞跃,是几千年害虫防治实践的历史必然;是生态学观点应用于害虫防治的必然;并且有着深刻的科学背景。“容忍哲学”的基本含义可以概括为:害虫综合治理是生态系统功能的一种整合作用。容忍无损大局;容忍有利于自然控制因子发挥作用;容忍有利于保护环境;容忍并不完全排斥消灭。     

停车诱导系统架构研究

通过对基于无线通信网络的城市停车诱导系统的可行性分析,提出了系统总体架构及实现的基本功能,指出系统存在的问题及可能的解决方案。     

Ruin Probability with Variable Premium Rate and Disturbed by Diffusion in a Markovian Environment

We consider a risk model with a premium rate which varies with the level of free reserves. In this model, the occurrence of claims is described by a Cox process with Markov intensity process, and the influence of stochastic factors is considered by adding a diffusion process. The integro-differential equation for the ruin probability is derived by a infinitesimal method.     

Newton's Easy Quadratures ``Omitted for the Sake of Brevity'

In the 1687 Principia, Newton gave a solution to the direct problem (given the orbit and center of force, find the central force) for a conic-section with a focal center of force (answer: a reciprocal square force) and for a spiral orbit with a polar center of force (answer: a reciprocal cube force). He did not, however, give solutions for the two corresponding inverse problems (given the force and center of force, find the orbit). He gave a cryptic solution to the inverse problem of a reciprocal cube force, but offered no solution for the reciprocal square force. Some take this omission as an indication that Newton could not solve the reciprocal square, for, they ask, why else would he not select this important problem? Others claim that ``it is child's play' for him, as evidenced by his 1671 catalogue of quadratures (tables of integrals). The answer to that question is obscured for all who attempt to work through Newton's published solution of the reciprocal cube force because it is done in the synthetic geometric style of the 1687 Principia rather than in the analytic algebraic style that Newton employed until 1671. In response to a request from David Gregory in 1694, however, Newton produced an analytic version of the body of the proof, but one which still had a geometric conclusion. Newton's charge is to find both ``the orbit' and ``the time in orbit.' In the determination of the dependence of the time on orbital position, t(r), Newton evaluated an integral of the form ∫dx/x <sup>n</sup> to calculate a finite algebraic equation for the area swept out as a function of the radius, but he did not write out the analytic expression for time t = t(r), even though he knew that the time t is proportional to that area. In the determination of the orbit, θ (r), Newton obtained an integral of the form ∫dx/√(1−x<sup>2</sup>) for the area that is proportional to the angle θ, an integral he had shown in his 1669 On Analysis by Infinite Equations to be equal to the arcsin(x). Since the solution must therefore contain a transcendental function, he knew that a finite algebraic solution for θ=θ(r) did not exist for ``the orbit' as it had for ``the time in orbit.' In contrast to these two solutions for the inverse cube force, however, it is not possible in the inverse square solution to generate a finite algebraic expression for either ``the orbit' or ``the time in orbit.' In fact, in Lemma 28, Newton offers a demonstration that the area of an ellipse cannot be given by a finite equation. I claim that the limitation of Lemma 28 forces Newton to reject the inverse square force as an example and to choose instead the reciprocal cube force as his example in Proposition 41. (Received August 14, 2002) Published online March 26, 2003 Communicated by G. Smith     

知识管理在学校资源库建设中的运用

针对当前学校资源库建设中存在的一些不足之处,提出了以知识管理的思想来进行资源库开发的新理念,着重介绍了知识管理思想在学校资源库建设中的运用过程以及应遵循的原则.     

Telyakovskiǐ型定理

本文在二阶连续模情形下,证明了满足Timan型估计的线性算子A,经过适当的修正后得到的线性算子A~+满足Telyakovskiǐ型估计。     

STABILITY CRITERIA FOR A CLASS OF UNCERTAINSYSTEMS WITH TIME—DELAY

Some stability criteria are obtained for a class of uncertain systems with time-delay usingLyapunov functional and analytic techniques. It is easy to check the criteria by making use of theboundedness of the uncertainties.