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1. Strength the quality checking of the pile is also important , but the existing checking methods are n ' t satisfied by now . a good method to check the quality of the pile was found in this paper after studied carefully by doing some experiments and studied the existing method
   加强水泥土桩的质量检查，有助于预防水泥土桩复合地基的质量事故，而现有的检测手段尚不尽人意，作者通过对静载试验等不同检测方法的研究，提出了适用不同情况下的检测方法。
2. A temperature - controlled scheme was decided that adopted a testing block and the temperature of the testing block was controlled to make use of liquid before some characteristics of heat exchange on solid , liquid and gas were studied carefully , according to the theory of mechanism and heat exchange
   根据机械、导热学理论，在充分研究固体、液体和气体的传热特性后，确定了采用试块测定法，利用液体间接控制紫铜块温度的控温方案，并且依据此方案设计了温控箱。
3. Firstly , this paper introduces the basic theory and the key technology of digital intermediate frequency system , secondly the method of the sampling rate conversion , multirate signal , and which is the important , essential theory in digital intermediate frequency system , is studied carefully . then it analyses the components of the flow chat . finally we simulated the designed system on spw and the properties of the system is make out
   文章首先阐述了数字中频系统的基本思想、关键技术和发展概况,然后研究了数字中频系统涉及的数字信号处理理论,主要内容包括欠采样技术、多速率信号处理、正交变换理论与高效数字滤波技术,然后详细分析了数字中频系统的设计,并在spw仿真平台上加以实现,最后根据仿真结果分析了数字中频系统的性能。
4. Chapter four briefly researches the principle of range migration algorithm . the relation and difference between frequency scaling algorithm and range migration algorithm are studied carefully . through the point simulation under ultra wide - band system parameters , we compare their imaging performances
   第四章简要介绍了距离徙动算法原理，着重分析了频率scaling算法和距离徙动算法之间的联系及区别，并通过超宽带( uwb )系统参数下的点目标仿真比较了它们的性能。