中频调制电视发射机中的群时延失真及其校正

阐述了在单通道中频电视发射机中存在的群时延失真问题及其给图像带来的不良影响,提出了校正方案及可选择的校正电路。     

m序列法测量室内脉冲响应的非线性失真分析

m序列法测量室内脉冲响应已经被广泛接受，鉴于实际系统中的噪声和非线性会降低脉冲响应测量的精确性，对m序列法测量过程中室内系统微弱非线性所引起的失真进行了分析．叠加有微弱非线性的室内系统在时域可以等效为一个线性子系统和非线性无记忆环节的级联模型．根据该模型，推导了单一非线性作用下运用m序列法测量的室内脉冲响应误差，并且分析了该方法对各阶非线性的抑制能力．仿真实验验证了推论的正确性．     

A thermal insulation method for a piezoelectric transducer

This study deals with the sources of signal distortion of a piezoelectric transducer heated by measured gas flow. These signal distortions originate from both unloading of preload on a piezocrystal because of expansion of a diaphragm in the test apparatus and the pyroelectric effect of a heated piezoelectric crystal. A plastic film on the diaphragm of the transducer can effectively insulate the diaphragm and the piezocrystal within transducer from heating by gas flow, eliminating the sources of distortion. A method for evaluating the thickness of the film is proposed.     

The mechanism of HIT/DLR prosthetic hand

A multi-sensory five-fingered prosthetic hand has been designed on the basis of underactuated mechanism and coupling principle. The hand is much similar to the adult hand. Three motors actuate the thumb, the index finger and the other three fingers each. The hand comprises 13 joints. Actuated by a motor, the thumb can move along a conic surface, which is superior in appearance. Driven by another motor with springs as transmission elements, the mid finger, ring finger and little finger can envelop objects with complex shape. The sensory system and the appearance design are introduced. It was verified by experiments that the hand has strong capacity of self adaptation and can accomplish accurate and powerful grasp for objects with complex shape.     

复合支护在施工箕斗装载硐室的应用

徐州李堂煤矿主井装载硐室施工工艺较为复杂,环节较多且此处岩层为泥岩、细砂岩、灰岩。地质构造复杂,岩层裂隙较为发育,非常破碎。采用复合支护施工方法有力保证了工程的安全顺利施工。     

浅析会计信息失真的成因及其对策

本分析了会计信息失真的成因，并结合《会计法》的有关规定，提出了整治会计信息失真的对策。     

论高校图书馆外文室的多元化服务

本文通过对高校图书馆外文室的功能及作用进行论述，指出在高校图书馆外文室实施多元化服务的必要性，探讨了外文室多元化服务的主要内容。     

功率放大器的分类及区别

本文讨论了目前市面上常见的几种功率放大器，并对其各自的优缺点进行了详细的对比，列出了各自的特点及适用的场合，为工业上功率放大器的合理选择提供了一定的参考依据。     

具有时滞效应二室模型的药物动力学分析

本文利用非平衡态统计物理学方法,探讨了含有时滞效应的二室模型中药物浓度动力学行为.结果表明,在引入适当的滞情况下,可以出现在中央室聚集和在两室中振荡的现象。这是某种给药方式而使药物在体内分布的一种由二室模型得出的新的结果;分析结果也表明,这种时滞效应不可能被包含在相应的速率常数之中.     

浅谈会计信息失真的治理

会计信息失真及其治理是当今会计界的热门话题,会计信息虚假的现实也使人们不能不重视这个问题。除了郑百文、银广夏这些会计造假的典型案例外,财政部2003年对152户企业2002年度会计信息质量检查的结果显示,近70%的企业会计信息严重失真。那么,会计信息失真的原因何在,如何治理,成为亟需解决的问题。