On the one hand , they benefit from the advantages common to all polymers ; as the products are easy to process , they can be used to manufacture light , aesthetic parts . designers can create products with complex shapes , and integrate functions more widely 一方面,他们得益于所有聚合物的共同优点,比如易加工,并且可用来生产轻巧,美观的零部件,设计人员可设计结构复杂的而功能更多的产品。
Aiming at the basic configuration of besiii electromagnetic calorimeter ( emc ) , the simulation system of besiii is annalyzed in detail . based on the software geant4 , a full simulation on the complex end - cap electromagnetic calorimeter ( eemc ) has been carried out 本文针对bes电磁量能器的基本结构,详细分析bes探测器的模拟系统,采用探测器模拟软件包geant4 ,对结构复杂的端盖量能器进行模拟。
The end , under the . : conditions in china which is vast in territory , has considerable differences in economy development and is complicated in social structure , it has great immediate significance to research on administrating grass - roots unit in city which is suited to chinese conditions 最后,在中国这样一个地域广阔,经济发展程度差异较大,社会结构复杂的环境中,研究适合中国国情的城市基层管理模式,具有非常重要的现实意义。
With regards to the characteristic of material ration of aircraft manufacturement which generally has abundant of information and complex structure , we introduce an object - oriented technology method in material ration management . therefore , the data of material ration can be managed conveniently and safely by this method 根据飞机制造行业材料定额信息量大、结构复杂的特点,本文详细介绍了一种基于面向对象技术的材料定额数据的管理方法,可以方便、安全的实现数据的管理。
In the paper , the relationships are introduced between gases category , and content dissolved in transformer oil and the destroy degree and fault style . the author have a deep research on the method of grey clustering , and classify together about consanguineous samples when giving attention to the sample characteristics " complexity and illegibility , so the system can realize expectant aims on the bases of lesser information . the analysis of instances testifies that the implement of theory of grey clustering on fault diagnosis in transformer is effective and the calculation is convenient 针对目前电力变压器故障诊断方法的现状,特别是对结构复杂的大型电力变压器等电气设备的故障诊断,首要的问题是如何根据反映变压器故障特征量指标来正确判断待诊设备是哪一类故障,作者对灰色聚类方法原理进行详细分析,在兼顾样品特征的复杂性和模糊性的基础上,依据样本一定的特征因素,使两样本间关系比较密切、相似程度比较大的同属一类,把一个不甚明确的整体信息不足的灰色系统尽可能地淡化、白化、量化、优化和模型化,以便能依据较少信息实现预期的目的。
Square resistance of bapb _ ( 1 - x ) bi _ xo _ 3 based thick films was near - linear increased and tcr of bapb _ ( 1 - x ) bi _ xo _ 3 based thick films was near - linear decreased with increase of content of ag . the electric conduction model of bapb _ ( 1 - x ) bi _ xo _ 3 based thick films was formed . bapb _ ( 1 - x ) bi _ xo _ 3 based thick film is actually conductive with lead and bismuth oxide , the main factors on the properties of thick film is the electric resistance and contact resistance of conductive particulates ; the electric conduction model of ag - bapb _ ( 1 - x ) bi _ xo _ 3 based thick film : the general structure of conductive network is constructed by conductance chain of ag and is submerged into bapb _ ( 1 - x ) bi _ xo _ 3 based conductive ceram 本文认为: bapb _ ( 1 - x ) bi _ xo _ 3厚膜电阻是一种掺有铅、铋氧化物的导电陶瓷烧结体,影响厚膜电阻导电性能的主要因素是导电颗粒自身电阻与颗粒间接触电阻;厚膜电阻掺银后的导电微观结构是由许多微小串联或并联的ag颗粒组成的导电链构成的结构复杂的多维导电网络,此导电网络被“淹没”在bapb _ ( 1 - x ) bi _ xo _ 3导电烧结体中。
For the high - speed digital signal processing , the structure of fpga and dsp is widespreadly adopted . dsp is more featured in the implementation of complicated algorithm , while field programming gate array ( fpga ) shows more advantage in its flexibility of design , simplicity of system configuration , modification and maintenance . in the paper , the hardware system of the spaceborne radar is based on the structure of fpga and dsp , of which the signal processing part is accomplished with one fpga chip and multi dsps Dsp适合完成结构复杂的算法;现场可编程逻辑阵列( fpga )适合完成高效、算法固定的任务;与专用集成电路( asic )相比, fpga优点主要在于其很强的灵活性、可在线配置、修改和维护方便等优点。本文工程中的星载雷达信号处理和控制系统就是采用dsp + fpga的方式。其中信号处理采用的是xilinx公司的virtex -和virtex系列fpga和多片analogdevices公司的tigersharcts101的硬件电路结构。
From some characteristics observed , such as the short lift time , narrow frequency band , fast frequency drift , quasi - periodic pulsation , spike event and complex magnetic structure , it is considered that the radiation mechanism of these events may be principally due to the electromagnetic waves magnified directly by the instable electronic cyclotron 从它们的观测特征:短寿命,窄频带,频率快速漂移,及尖峰事件与磁结构复杂的大黑子活动区密切相关等,认为这些事件的辐射机制可能是电子回旋脉泽不稳定直接放大电磁波所致。
Finally , based on the results of theory and simulation , a model of reluctance coil launcher is realized . it is proved that the new launcher overcomes the shortcomings of the traditional coil launcher whose discharge time is difficult to control and structure is complex . the excellent performance of the launcher is proved by the experiment data 最后,根据理论分析和仿真结果,搭建了一种磁阻型线圈发射系统,实验结果说明该发射系统克服了传统磁阻型发射器放电时间难于控制和线圈结构复杂的缺点,实验数据很好地验证了新型发射器的理论设计和仿真结果,为今后的学习积累了实验数据和实践经验,为进一步的研究探索提供了指导。
The creation of large and complex international financial institutions has also presented considerable challenges to the management of such institutions , so that the importance of observing the fiduciary duty of financial intermediaries may not have received the attention it deserves at the working level 此外,大型而结构复杂的国际金融机构的出现,也对这些机构本身的管理工作带来不少挑战,以致一般运作层面的人员未必会时刻紧记履行金融中介机构融通资金的基本责任的重要。