在改进

Index weights of water security assessment indicators were determined by entropy method. Then get composite indexes of water security assessment since 2000, on the basis of it carry through the correlation analysis and forecast.

首先分析了目前我国水安全问题，在此基础上以济南市为例，采用改进的PSR模型构建济南市水安全评价指标体系，通过熵权法确定指标权重，计算出2000年以来济南市水安全评价综合指数序列，并在此基础上进行相关分析与预测。

Greater flexibility has come with fuel injectors, which can metre fuel more precisely than carburettors, and variable-valve control, which can optimise the opening and closing of inlet and exhaust valves to produce more power when accelerating or greater economy when dawdling around town.

重要改进来自于电喷系统，它能比化油器更精确地控制燃料的喷射；以及可变气门系统，它能够优化发动机的进气和排起阀门的开启，让车子在加速时更有力而在低速运行时更省油。

This paper attempts to associate PFC technology with Quasi-Resonant DC/DC Converter and Synchronous Rectifier technology, to work out a novel switching power supply with higher efficiency and low contamination, which both achieved high power factor, improved effecting on electrical network and ensured high efficiency, furthermore, it is easy to be realized and controlled in circuit.

本文首先阐述了开关电源、功率因数校正技术和同步整流技术的发展及现状，对DC/DC变换的拓扑结构进行了选择，确定了带有隔离的准谐振(Quasi-Resonant)反激型电路，可以有效地降低损耗；接着本文对几种常见的PFC拓扑电路进行分析对比，从中选择了BOOST型电路，对工作在临界状况下的电路进行了分析，采用跟随输入电压的升压变换新技术，减小了电感体积，同时降低了开关管的电压应力，既简单又有效地实现了功率因数校正，并发现此技术值得推广；由于反激型变换器的效率一般都较低，所以本文在传统同步整流技术基础上对其加以改进，设计出一种新颖、高效的同步整流方案。

In order to develop and modify Gregory scheme for cumulus convective parameterization,we make the improvement as follows:(1) The large-scale moisture convergence is taken into account and the organized inflow,which occurs in the area of large-scale moisture convergence and is directly proportional to it, is added to turbulent airflow.(2) The influence on saturation vapor pressure exerted by supercooled water is taken into account and the initial mass flux is adjusted. Based on diagnosis of the air heating and moistening, the downdraft airflow is adjusted.(3) Based on the character of our country heavy rainfall,which usually occurs in the mixed cloud consisted of stratocumulus and cumulus, the process of excessive convection is restrained by organized outflow in the top of cloud and improving downdraft current and by reducing the evaporation of rainfall and release of latent heat.

为了改进和发展Gregory积云参数化方案，(1)考虑了大尺度水汽辐合对积云对流的影响，即在混合卷入中加入有组织的卷入，让有组织的卷入存在于有大尺度水汽辐合的层次上，并且与大尺度水汽辐合直接成比例；(2)考虑了过冷水存在对饱和比湿的影响，调整了初始的质量通量，并且根据对大气加热加湿的诊断，调整了大气向下拖曳的强度；(3)根据我国降水多由层状云和嵌入其中的对流云混合产生的这一特点，对于过强对流过程进行抑制，在云顶加入有组织的卷出，同时加大向下拖曳的强度，减少蒸发以降低潜热的释放，抑制过强对流的发生。

This is a decline of over 40% over the past 25 years -"A decline that predates the widespread use of defibrillators but parallels drastic changes in medical therapy for acute MI, including reperfusion and secondary prevention."

在过去的25年里，其降低率超过40%&这一降低不是因为早期除纤颤器的广泛应用，而是由于在医疗方面针对急性心肌梗死包括再灌注和二级预防的巨大改进。&

No two islands were alike in the systems and nature of their defensive emplacements, and local improvization and command preferences affected both materials used and defensive models.

二战期间太平洋战场上争夺那些被日本侵略军盘踞的岛屿的那些持久而又血腥的战斗是20世纪世界战争的一个新特点，没有任何两个岛屿的防御工事在其系统和自然位置等方面是相似的，在战争中的改进与指挥水平也影响了器材的选用以及防御模式……等等的这些都向读者详细说明了日本军队各种临时性与半永久性的重武器工事、班排级掩体、单兵掩体之间的组织关系、建筑之间的关系、效率的发挥等内容。

Yang Xiumei, who is lying on a hard bed in a small, dim ward of Jiuxian's hospital, has picked the wrong time to suffer haemorrhaging and abdominal pains.

旧县医院一个阴暗角落里（在医院的改进和提升过程中被遗忘），杨秀梅正躺在一张小小的硬板床上，忍受着脑出血和腹痛的折磨。

The results of simulation show that:In systems that have a lot of of procressors,using router-cache can improve the speed of multiprocessors systems under most conditions.

模拟结果表明：在系统中结点数目较多时，采用路由器在多数情况下可以改进应用程序的执行速度。

Jet orifice had been added for air entry,only little air was got into the hole bottom,the most of air entered into internal pipe through the jet orifice ,then was carried out from the hole bottom.

针对贯通式潜孔锤在复杂地层钻进中遇到的问题，对反循环钻头进行了改进：在钻头上部增加喷射孔，使气流只有一少部分进入孔底，大部分经喷射孔直接进入内管，排至地面。

From the assessment of the clients, the vast majorities of the counselors and psychotherapists do well in work ability, confidentiality and time-setting, but not so well in informed-consent and dual relations, which need to be paid attention to and improved.

从来访者评价的角度，绝大多数的心理咨询／治疗师在工作胜任能力、保密、遵守时间设置方面做得较好，但在知情同意、双重关系方面存在问题，需要引起重视并改进。

They go to town. Would you just ask them?

他们在城里你能问他们吗？

Ossein pretreated for a2 weeks period exhibited the maximum% yield incase of bone gelatin, while the yield from intact skin was higher than that realized incase of de-scaled skin.

预处理时间达2星期的骨胶原表现出最高的骨明胶百分产量，然而从未处理鱼皮中得到的产率比去鳞的鱼皮得到的要高。