中国经济持续发展中的生态环境问题与逆转战略

本文应用生态学、经济学、市场学、环境学、灾害学的观点，分析了中国经济发展中环境的面临的主要问题和退化症结，根据市场经济发展的要求，提出了生态环境上合理、经济效益上合算、整治技术上先进的对策，为综合整治中国生态环境提供基本思路。     

关于C_(11)A_7·CaF_2稳定性的研究

本文采用X射线衍射分析方法,研究了影响C_(11)A_7·CaF_2稳定性的因素,结果表明C_(11)A_7·CaF_2在1450℃以内,能够稳定存在;Mgo,K_2O对C_(11)A_7·CaF_2稳定性没有影响;Na_2O、P_2O_5和CaO能与C_(11)A_7·CaF_2发生反应、分别生成少量NC_6A_3、Ca_5F(PO_4)_3和C_3A,但在硅酸盐水泥熟料的正常煅烧制度下,反应程度较低,对C_(11)A_7·CaF_2稳定性不大.熟料中铝酸盐相存在的形式,主要取决于氟在熟料中的分布,CaF_2掺量较低,温度超过1350℃,C_(11)A_7CaF_2消失,生成C_3A;CaG_2掺量较高时,温度高达1450℃,熟料中的铝酸盐相仍为C_(11)A_7·CaF_2,而不生成C_2A.     

论《阿Q正传》的喜剧性

针对一些人认为《阿Q正传》是悲剧的观点,明确认定《阿Q正传》是喜剧性质的,并对其喜剧性进行探讨,结合鲁迅先生创作动机,从作品的艺术风格和阿Q这个人物本身分析该作品的喜剧性以及用喜剧创作的艺术效果.     

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.     

宿舍智能化管理系统的研制

研制开发的宿舍智能化管理系统可以实现对宿舍楼中的人员和财产进行管理,同时还能实现对整个宿舍楼寝室的定时语音提醒和呼叫功能.     

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     

基层图书馆工作现状及对策

针对新时期基层图书馆所面临的经费不足、体制僵化、管理观念陈旧等一系列问题，提出了使基层图书馆走出国境、适应新时代发展需要的若干对策。     

乙酸乙酯分离竹子中木质素制浆造纸研究

用乙酸乙酯浸提竹子制取纸浆，并用造纸行业相关国家标准对纸浆进行了分析。探讨了乙酸乙酯浓度、反应温度、反应时间、原料与溶剂的固液比对纸浆质量的影响。实验结果表明：当乙酸乙酯浓度为60％、反应温度为180℃、反应时间2h、原料-溶剂比为1：6时，制得的纸浆中残余木素含量相对较低、纸浆得率较高。     

区域生态经济系统的稳定有序与经济增长

实现区域经济持续增长问题是人类社会发展中十分重要的课题。本文把区域经济发展与生态环境视为一个生态经济系统，分析了生态经济系统的性质。应用生态系统理论提出实现区域经济持续增长的策略和措施。     

一种高级计算机语言──SAS语言初探

扼要介绍了ＳＡＳ语言及其关键步（ＤＡＴＡ步和ＰＲＯＣ步）．给出了几个例子，以说明如何使用ＳＡＳ语言。