网吧消防安全现状与防火对策

阐述了网吧的火灾危险性,分析了网吧火灾原因及特点,提出了网吧防火的安全对策。     

并行双回转光纤单元跑合过程中爬行现象浅析

并行双回转的爬行现象对高精度光纤定位是十分不利的.为了克服这种爬行现象,首先从动力学角度建立光纤爬行的动力学模型,论证了光纤爬行的实质是一种复杂的摩擦自激振动现象,然后结合实际跑合过程,从机械学的角度进一步分析获得传动齿轮安装偏斜、中心轴支撑同心不良、中心零定位弹簧片安装过紧和偏心消隙弹簧不能正常储能、释能是导致光纤爬行的根本原因,并对此提出了一些可行的解决措施,收到了良好的效果.     

PEAK COVARIANCE STABILITY OF A RANDOM RICCATI EQUATION ARISING FROM KALMAN FILTERING WITH OBSERVATION LOSSES

We consider the stability of a random Riccati equation with a Markovian binary jump coefficient. More specifically, we are concerned with the boundedness of the solution of a random Riccati difference equation arising from Kalman filtering with measurement losses. A sufficient condition for the peak covariance stability is obtained which has a simpler form and is shown to be less conservative in some cases than a very recent result in existing literature. Furthermore, we show that a known sufficient condition is also necessary when the observability index equals one.     

CONSTRUCTIVE KISSING NUMBERS IN HIGH-DIMENSIONAL SPACES

In the present paper, we focus on constructive spherical codes. By employing algebraic geometry codes, we give an explicit construction of spherical code sequences. By making use of the idea involved in the proof of the Gilbert-Varshamov bound in coding theory, we construct a spherical code sequence in exponential time which meets the best-known asymptotic bound by Shamsiev and Wyner.     

某重型自卸车制动性能分析

文章以HFC32XXXX1重型自卸车为分析对象,建立了三轴汽车的制动力学模型,对其在空载、满载和超载情况下的前、后制动力矩,制动力分配和制动效能进行理论分析和模拟计算;结合平板试验台的试验结果,根据有关标准和ECE法规要求,评价了其在不同载荷情况下的制动性。     

浅谈铁路运输实践课的教学

通过对铁路车站行车工作细则业务的系统分析和对铁路运输生产和组织管理的理论研究表明:铁路运输实践课为铁路运输专业学生提供了理论联系实际的平台,对培养学生独立分析和解决铁路行车方案问题的能力有着重要的意义。     

发展战略与企业管理

加入WTO以后,中国企业面临着经济国际化带来的挑战,如何在激烈竞争中占有一席之地,企业需要认真审视发展战略,以四层级战略管理进行战略能力的系统化设计和布局,尽快做大做强。     

图书馆无人管理查询机的实现

针对图书馆OPAC查询用计算机管理中普遍存在的一些问题,介绍了实现图书馆查询机管理自动化的方法。     

Philosophy of chemistry and the image of science

The philosophical analysis of chemistry has advanced at such a pace during the last dozen years that the existence of philosophy of chemistry as an autonomous discipline cannot be doubted any more. The present paper will attempt to analyse the experience of philosophy of chemistry at the, so to say, meta-level. Philosophers of chemistry have especially stressed that all sciences need not be similar to physics. They have tried to argue for chemistry as its own type of science and for a pluralistic understanding of science in general. However, when stressing the specific character of chemistry, philosophers do not always analyse the question ‘What is science?’ theoretically. It is obvious that a ‘monistic’ understanding of science should not be based simply on physics as the epitome of science, regarding it as a historical accident that physics has obtained this status. The author’s point is that the philosophical and methodological image of science should not be chosen arbitrarily; instead, it should be theoretically elaborated as an idealization (theoretical model) substantiated on the historical practice of science. It is argued that although physics has, in a sense, justifiably obtained the status of a paradigm of science, chemistry, which is not simply a physical science, but a discipline with a dual character, is also relevant for elaborating a theoretical model of science. The theoretical model of science is a good tool for examining various issues in philosophy of chemistry as well as in philosophy of science or science studies generally.