Second , this dissertation focuses on the error analysis of digital method of the pulse compression signal generation based on lfm signals . the difference and similarity between technique of the direct reading of the stored digital waveform and technique of the direct digital synthesis were also compared ?第二部分以lfm脉压信号为基础，围绕数字脉压波形产生系统的误差分析展开，对波形存储直读法和直接数字合成法两种数字波形产生技术进行全面的分析对比。
The effects of reactive conditions on the products were discussed and the proper conditions are determined . we primarily synthesize a series of ba1 - xsrxti1 - ysnyo3 solid solutions nanopowder by low - temperature / low - pressure hydrothermal method under the condition of 150 , 0 . 5mpa 采用低温一低压水热合成法，在150 ， o . smpa以下合成了一系列bal一xsrxtil一ysnyo3固溶体纳米粉末，由于掺杂离子均匀进入母体晶格以及材料的结晶更完整，使得介电性能明显改善，不仅t 。
In this paper , the principles and the main processing of new methods for preparation of ferrite powders are discussed , including self - propagating high - temperature synthesis , low - temperature combustion synthesis , mechanochemical synthesis , hydrothermal synthesis , freeze drying and supercritical fluid drying 综述了铁氧体粉料的新型制备方法的原理和主要工艺过程，包括自蔓延高温合成法、低温燃烧合成法、机械化学合成法、水热法、冷冻干燥法和超临界流体干燥法等。
Abstract : first , the key magnet statuses and their pertinent mmf . position of exterior rotor brushless dc motor are described in this paper . second , the air - gap magnetic field and the armature reaction of the three - phase six - step exterior rotor brushless dc motor used in electrical bicycle are analyzed by means of mmf . vector , mmf . integration and magnetic field fem respectively . some valuable conclu - sions for designing this kind of motor are obtained 文摘:给出了外转子无刷直流电动机的典型磁状态及其对应的磁势矢量位置，并用磁势矢量合成法、磁势积分法及电磁场的有限元方法对电动自行车用三相六状态外转子无刷直流电动机的气隙磁场及电枢反应进行了详尽的分析，从而得到有益于该种电机设计的结论。
The enhancement of process , the feature size of device becomes smaller , and the deductions of the power supply require the art of design should be consummated . this article firstly makes a detailed analysis and expatiation for the operational principle and design technique of switched - capacitors - filter . then realize the filter design in biquadratic method and z - domain synthesis 本文在对开关电容滤波器的工作原理及设计方法进行了系统的阐述和分析的基础上，分别用双二阶方法和z域合成法实现了适用于dtmf信号的开关电容滤波器的设计，并用无锡华晶0 . 6 mcmos工艺( csmc60 )进行了仿真。
