In order to show the scattering and complex mode - conversion clearly , the total field is decomposed into longitudinal and transverse parts and the scattered field is obtained by subtracting incident wave from the total field 通过对纵横波的分离和在全波场中对散射波的分离,清晰地显示了裂纹对脉冲超声波的散射和复杂的模式转换。
This thesis analyzes circle array ’ s performance and employs different arithmetic accordingly ; transforms circle arrays to line arrays by mode transform ; analyzes the space geometry antenna ’ s pattern function 本文分析了圆形阵列的性能,在此基础上应用了不同的算法;利用模式转换将圆形阵列转化成为虚拟的线阵,并且分析了共形天线的方向图函数。
Often , mode conversion techniques are used to change the undesirable mode to one that results in a radiation pattern with a boresight peak such as circular te1 1 or rectangular te 01 mode 因此研究轴对称模式的天线辐射技术具有重要意义。辐射天线的工程设计方案通常有三种:模式转换器+普通喇叭、 vlasov天线和cobra ( coaxialbeam - roatatingantenna )天线。
Then we provide a system of axiom based on class level , some algorithms about how to transform class level to database model , three aproches of how to realize properly inheritance in class level 然后在现有rdbms坚实的理论基础上,对新一代的ordbms创新性地提出了基于类层次的公理系统、变换规则,并给出了基于关系模式的类层次向关系数据库模式转换的基本算法。
Practisingly it fulfills the exchange between the optical equipment database and xml . on one side , from the database to xml it can realize data issuance . on the other side , from xml to the database it can realize data integration 具体操作上,完成了光学设备数据库与xml的互相转换,一方面,数据库转换为xml模式,实现数据网上发布,另一方面, xml模式转换为数据库,实现数据集成。
It also gives the schema of how data exchange , transmit , express , display on the new constructed system , the schema constructing new distributed system with xml data view level which is created on the theory of schema and realation schema conversion 文中给出了基于这种新构架的数据交互、传导、表达、显示方案;利用模式和关系模式转换关系形成的xml数据视图层,开发分布式体系结构的实现方案。
The dc / dc converter provides pulse voltage , which returns to zero periodically , for the devices in the inverter to realize zvs . but the devices still have some on - loss under two kinds of state commutation . therefore , it is better to use the devices with smaller junction capacitor 通过对逆变桥工作模式的分析,发现在两种模式转换的过程中功率管开通时存在一定的损耗,据此认为逆变桥功率管应采用输出电容小的器件。
First of all , the thesis uses financial function theory and discloses the inherent reason and conditions of the two models " conversion , and points out that amalgamation of banking and securities is just the external representation of the financial structure adjustment , the real reason is reconstruction of the financial function caused by the promotion of the market division 首先,本文运用金融功能理论来揭示两种经营模式转换的内在原因和条件,指出合业经营只是金融结构变化的外在表象,其深层原因是市场分工深化导致的金融功能配置格局的重构。
Under the " family responsibility system " individual households are independent producers and decision - makers . to successfully and effectively realize the conversion from conventional to organic production pattern in the adequate areas is mostly depending on the farmer ' s behavior and knowledge on potential market , perception on relevant technologies and the process of decision - making 在家庭联产承包责任制下,农户是独立的生产经营者和决策者,能否在资源和生态条件合适的农村地区成功地实现从常规生产向有机食品的生产转换,很大程度上取决于农户对自身面临的市场、相关技术的认知、态度和生产模式转换的决策。
This paper describes the basic features and components of data warehouse system , and deals how to use description - driven technology to integrate different data warehouse systems , how to implement the change from one data schema to another , how to clean dirty data in data transformation process , and how to exchange data among different components or systems . at last , this paper takes two products to illustrate how to implement systems following these principles and methods . these two products are the e - chain system as an application in commerce domain , and the ftedws system as an application in engineer test domain 本文分析了数据仓库系统软件的基本特征,提出了利用描述驱动技术来实现数据仓库系统的集成管理,描述了etl操作和分析处理的基本处理流程和相应的执行构件,定义了集成框架中数据模式转换规则和数掘清洗规则,构建了一个基于星型模式和对象模型的分析模型和相应的数据查询语言,提出了集成框架系统构件间的数据交换标准,并定义了基于此标准的的数据交换和元数据交换方法,探讨了集成框架标准构件管理的基本方法和权限管理,最后介绍了数据仓库集成框架系统在商业领域的应用实例e - chain系统和工程试验领域的应用实例ftedws系统。