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With the overview of present MIMO antenna research, the thesis brings forward a new kind of polar diversity antenna array applied in MIMO base stations, which elements are planar printed dipoles. The beamforming technology is used to obtain a particular type of elevation pattern, which has square cosecant characteristic.

本文在对目前MIMO 天线领域的研究动态进行概述的基础上，结合基站的自身特点，提出并实现了一种新型的基站极化分集波束赋形天线阵列，其阵元为平面印刷偶极子，阵列在俯仰面形成类似平方余割形式的方向图分布。

In the text, first introduce the constitute, principle and characteristics of the cchp system which is a comprehensive energy system; in the following, overview the domestic development and the research situations of outside in this realm; immediately after, introduce in brief the research object"s engineering general situation and the design projects that be brought up aimed at this engineering in this text; then detailed discuss a kind of lately thermal economics cost absorption method- the method of share the cost of the product"s Exergy according to the ability class, and make use of this method and the product Exergy equivalence method and steam equivalence method to carry economics analysis to the design project respectively,and carry on the economy compared for the calculation of the several kind different cost absorption method from the point of view that the price of the energy Exergy.

文中，首先介绍了热电冷联产这一综合能源系统的组成、原理及特点；综述了国内外在这一领域的发展和研究概况；接着，简单的介绍了本文所研究对象的工程概况及针对本工程所提出的设计方案；然后详细讨论了一种新的热经济学成本分摊方法-按能级分摊产品火用成本法，并分别运用此方法和产品火用等价法、蒸汽等价法对设计方案进行经济性分析，从能量火用价格的角度对几种不同分摊方法的计算结果进行经济性比较。

Required: Two approved science courses; a course offering an overview of the principles of physics, chemistry, and life sciences will be one of the two courses required of some students.

要求：两门被认可的理科课程；物理学，化学和生命科学原理对所要求的学生将是两门课程之一。

Here is an overview of ten creepy crawly enemies of roses and some ways to identify them.

这里是一个概述10 creepy crawly的敌人玫瑰和一些方法来识别它们。

This Recommendation gives an overview of the functions of SDH equipment, examples of multiplexer and cross-connect equipment types and general performance requirements.

本建议给出SDH设备的功能概况、复用器和交叉连接设备类型的例子和一般性能要求。

You can also click on Analyze to show an overview of your hard drive's current level of fragmentation.

您还可以点击分析表明概述了您的硬盘驱动器目前的水平，不成体系。

In Chapter 1, the history, recent development and prospect on radical chemistry are summarized. And an overview of experimental and theoretical background of radical cyclization reactions is included.

论文第一章概述了自由基化学的历史背景、研究现状和发展前景，并对自由基环合反应的实验及理论背景进行了介绍。

Data - From Dashboards, to drill-down summaries, to overview and to detailed levels, daa must be presented in a useful manner.

数据-从仪表板，以钻下来的摘要，简介，并详细各级的D AA必须在一个有用方式。

An overview of Web data management is given in this paper.

数据库是从 60年代初发展起来的计算机技术。

Privacy protection based on data mining is an important part of database technology, this article is an overview of their development.

基于隐私保护的数据挖掘是数据库技术重要的一部分，本文是对其发展的概述。

Smoking cigarettes adds to the Computer Desk Computer manufacturer computer mouse Computer Computerized collar knitter machine Conduit Bodies construction board Container Bag Control Arm Cooking Thermometer general levels of air pollution as well as damaging our health.

吸烟不仅对健康有害，而且增加空气污染程度。香烟雾含有多种有害物质：不仅有致癌化学物质、有某种能阻止氧气进入血液的气体，还有引起血压增高、心速加快的被称为尼古丁的物质。

He is one of my favorite actors.

他是我最喜欢的男演员之一。