摘要:本文讨论了以激光为光源的角散射式微粒测量装置的工作原理及其优点,并在大量分析国内外研制生产的该种测量装置的基础上,指出了在单散射角下对颗粒进行检测时,存在着测量结果出现多值性的可能,文中讨论了解决这一关键技术问题所采取的可能方案和措施。

摘要:在采用话音激活的卫星SCPC系统中,通常应用计算机模拟的方法研究互调噪声,因而误差较大。本文经严格的数学推导,求得经话音激活的互调噪声的精确计算式,并结合国际卫星Ⅳ号通信系统,计算采用话音激活使互调噪声改善的确切数值。其结论对卫星通信系统的设计和研究有重要意义。

摘要:我院科研工作在1987年又获得新进展,有37项科研课题通过了技术鉴定。其中23项通过部委、省(市)局级鉴定。在这些科研项目中,有8项达到国际水平,23项属国內先进或首创。

摘要:本次稳流试验用来预测新颖的椭圆气缸往复式内燃机的性能。实测数据和分析结果表明,椭圆截面气缸内燃机此起等容积正圆截面气缸内燃机,增大了进、排气门,从而提高了充气效率;或在充气效率不减的条件下,大幅度提高转速或增压,以实现发动机的高强化。

摘要:我国洗衣机的生产发展十分迅速,从1978年的年产400台到1985年的883万台,八年间增长二千多倍,今后的生产发展前景如何?运用本文介绍的一种预测模型,可以求得公元2000年以前每年洗衣机需求量的预测值,并求得1983年8月至1991年1月为洗衣机生产发展的成熟时期,该模型亦可用于其它耐用消费品的生产发展预测,所得结果可供有关部门决策时参考。

摘要:本文研究玻璃管空气预热器的优化问题,提出了管式空气预热器优化设计的通用计算机软件,并进行了实例计算。同时还对卧式空气预热器的经济流速和最佳风烟速比进行了讨论。

摘要:本文简要介绍汽轮发电机组中的碰摩故障,并用模糊集间的距离和贴近度的概念分析和计算了单盘模拟转子和实物转子的振动响应。结果表明,贴近度与碰磨力的大小成反比,相对的和绝对的汉明距离,欧几里德距离与碰磨力成正比。

摘要:本文首先介绍了运用SADT所构造的一个名为“核算人工费力的模型,然后结合该模型分析和论述了SADT的七个主要特色,并对运用该方法进行活动分解的要点作了一些探讨,最后给出了关于该方法的一些总的结论。

摘要:In previous work, the analysis of the effects of aggregating simple dynamic systems has been studied by applying methods developed for thermodynamic systems in order to take account of stochastic effects. This approach is based on the Master Equation for the probability density of the contents of a vector of system levels. The goal of these studies is to determine the dynamic characteristics of systems composed of a population of sub-systems with the same dynamic structure while accounting for novel behavior that is introduced by the process of aggregating the sub-systems into the larger system.

摘要:本文阐述热水锅炉水动力模化试验方法,以及原型与模型相似所必须遵守的条件。提出按照相似理论设计模化试验装置时,可利用流体进入自模化后,流体流动状态及速度分布与Re无关这一特点来简化相似条件。同时以120×10~4kcal/h(503×10~4J/h)自然循环热水锅炉为例,具体说明模化试验装置的设计

摘要:本文介绍了非绝热毛细管中制冷工质两相流实验研究及理论研究的历史和现状,分析了目前存在的问题,讨论了这一领域中研究工作的几个发展方向。

摘要:摩擦系数的测定和分析对当今节能和节材的方针具有重要意义。文章指出,由于古典摩擦定律存在着一定的局限性和不确切性,因而对摩擦系数物理意义进行重新分析很有必要。本文通过一系列金属材料的摩擦试验所测得的摩擦系数值及其变化规律,提出了对摩擦系数物理意义的补充,认为尽快地制订摩擦系数测定标准和建立摩擦系数数据库来代替追求统一数学计算的模型是切合实际的,并指出了摩擦系数只有靠实测来确定的方向。

摘要:Generally speaking, there are two distinctions in the meaning of words: general and specific or abstract and concrete We call a word"general" when it refers to a group or a class, we call a word " specific" when it denotes individual objects or a member of that class. For example, "clothing-is a general word, but"overcoat","jacket", "blouse",

摘要:Successful innovation management depends upon both, the intrinsic attributes of the new product to be marketed and the firm's internal performance like cost management, timely delivery and quality assurance. The impact of these latter aspects is frequently neglected in the design of models for supporting decision making in innovative firms.A model is outlined to study the market response of different manufacturing policies for innovative goods. It allows e.g. the evaluation of an aggressive strategy with large production capacities from the outset, or a more tentative behavior to. avoid the pressures stemming from high fixed cost and the risks of eventually idle capacity.

摘要:The development and utilization of global/world models in the context of political implications of world economic trends is overviewed in terms of three streams of research, that of the multidisciplinary social scientists, of the econometricians, and of the system engineers. Socio-political processes impinge on world economic trends, just as such trends in turn impact on politics, both national and international. The use of simulations rich in system dynamics for the study of international affairs is found to have much potential, as documented in findings obtained by researchers throughout the world.