锅炉给水泵富裕扬程过高的危害

通过对锅炉水泵的H－Q曲线及P－Q曲线的研究分析，结论为泵的富裕扬程过高，将使整个系统的效率降低，还会使泵产生气体，发生汽蚀和供水不足，并提出了相应的解决方法。     

涡轮流量计动态特性分析

本文建立涡轮流量计动态数学模型 ,并对涡轮流量变送器的运动微分方程和传递函数进行了分析 ;从理论上计算得出 LW-1 5型涡轮流量计的单位阶跃速度响应 ;证明了限制涡轮流量计动态响应速度的瓶颈是流量积算仪的动态响应 ;最后提出了用软件代替流量积算仪的实验方案     

用改进的元胞自动化模型模拟不同信号灯控制策略下的交通流

Traffic flows controlled by traffic light strategies were investigated via a cellular automaton model with anticipation, which is suitable for describing urban traffic. Three kinds of strategies, i. e., synchronized, green-wave and random switching lights, were designed, simulated and compared with each other. It is shown that the green-wave strategy is only valid at lower density and there is not an effective way with the three strategies to improve the efficiency of traffic flow at high density.     

A proof of maximum contention-flee property of interleavers for Turbo codes using permutation polynomials over integer rings

It is well known that interleavers play a critical role in Turbo coding/decoding schemes, and contention-free interleaver design has become a serious problem in the paraUelization of Turbo decoding, which is indispensable to meet the demands for high throughput and low latency in next generation mobile communication systems. This paper unveils the fact that interleavers based on permutation polynomials modulo N are contention-free for every window size W, a factor of the intedeaver length N, which, also called maximum contention-free interleavers.     

基于Carr指数法的高炉喷煤流动特性研究

应用Carr指数法对高炉喷吹煤粉的松装密度、振实密度、压缩率、自然坡角、板勺角、均匀度、崩溃角、差角、分散度的测定进行分析。对照Carr流动指数表及喷流指数表,对该煤种喷吹性能进行合理的分析。Carr指数法补充了安息角测量的不足,使高炉喷吹煤粉的流动性及喷流性的模拟更加科学合理。通过Carr指数法分析,煤粉的流动特性与煤粉变质程度正相关,煤粉喷流特性与煤粉变质程度负相关。     

我国高等教育评估中介机构的组织特性和治理系统分析

与我国国情相统一,我国高等教育评估中介机构的组织特性和治理系统呈现出了自己的特点。分析我国高等教育评估中介机构的组织特性和治理系统,对于完善和改进评估中介机构的中介性,充分发挥评估中介机构的功能具有重要意义。     

略谈英语谚语的民族特性

任何民族谚语的产生都与一定的自然环境、社会环境、文化环境等因素有关,英语谚语也不例外。本文拟从以上这些方面对英语谚语民族特性的这一重要特征进行探讨,并在分析的同时与汉语谚语进行比较,以便使我们更好地理解和掌握英语谚语。     

ON EUPHEMISM

Euphemism is defined in Longrnan Dictionary of Con-temporary EngIish (l978) as .' (an example of ) the use ofa pleasanter, less direct name for sorneth1ng thought tobe unpleasant. "The New Edition of the Oxford ConciseDictionary (1976) defines euphemism as "Substitution ofmild or vague or roundabout expression for harsh or di-rect one; expression thus substituted. "In Webster's NewColIegiate Dictionary (l973) the definition of euPhemismreads, "substitution of an agreeable or inoffensive …     

滇南热带雨林榕树的研究综述

榕属植物(Ficus)统称榕树。主要分布在热带地区,尤以热带雨林最为集中,其种类多,群体大。榕树生活型及生长发育特点多种多样,它们具有雌雄同株和雌雄异株两种繁殖系统,有性繁殖必须依赖专一的榕小蜂传粉才能获得。在热带雨林中,榕树不仅能体现热带雨林景观,为多种动植物提供生态位,还在是热带雨林的演替中扮演重要角色,是热带雨林生态系统中的一类关键植物。榕树还与当地居民的生活发生着密切的关系,是一类可食用、药用和制造生活用品的植物。最后,针对榕树资源的研究、特别是利用现状进行了论述,对其进一步合理开发、利用榕树资源提出了建议。