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Abstract: A noise model for the analog correlator used in the ultra wideband receivers is proposed due to lack of simulation capability on noise performance of the correlator in current EDA tools.The analog correlator circuit is divided into several parts
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文摘:给出了分析模拟相关器的噪声模型.将相关器分成不同的几个子模块后,对各模块分别计算等效噪声源.然后用理想脉冲源代替噪声源计算电路的时变传输函数,接着用傅里叶变换计算输入输出的频域关系.利用电路的对称结构合并对称的子模块可以进一步简化模型.该模型可以用来估计相关器的噪声性能. |
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Abstract: A novel computational model of 3-D flatness is developed, and a new model of flatness detection signal is explored.
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文摘:本文建立了三维板形计算模型和包括系统噪声的板形检测信号模型。 |
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Abstract: A novel driving circuit based on the UC3842 chip is introduced.The driving circuit can work at any duty ratio.It has some advantages,shch as high performence,low cost,strong protection function ect.This driving circuit can be used for single pow
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文摘:设计了一种新颖的基于UC3842芯片的功率开关器件驱动电路，此电路可以工作在任意占空比，具有高性能、低成本、保护功能强等优点，适用于功率开关器件MOSFET、GTR、IGBT的单管驱动。 |
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Abstract: A novel enzymatic reaction—ammonolysis was introduced in thenineties.This reaction not only provides a synthetically useful and mild alternative method for the synthesis of amides,but also can be used for the kinetic resolution of chiral alcohol
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文摘:酶促氨解反应是20世纪90年代中期发现的一种新型反应,在脂肪酸酰胺的合成、手性药物（手性酸及手性醇等）的拆分中显示出巨大的应用潜力，是除立体选择性水解、酯化、转酯反应之外的另一具有较大开发应用前景的酶促新型反应。 |
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Abstract: A novel method is presented which is called interferometric method.
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文摘:提出了一种新的研究测试高聚物体系中小分子物质迁移的方法――干涉法。 |
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Abstract: A novel strip-coil-baffle structure used to enhance heat transfer and support the tube bundle for a tube-shell heat exchanger is proposed.The new structure can sleeve the tubes in bundle alternatively to create a vortex flow in a heat exchanger.
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文摘:介绍了一种用于强化管壳式换热器壳侧传热和支撑管束的螺旋折流片新型结构,该结构是对换热器管子相间地套上螺旋折流片以产生旋涡流动.研究模型是在正方形布置的4个管子中的2个对角管子套上螺旋折流片后形成的通道,利用FLUENT软件对该上述四管通道模型的流场和温度分布情况进行了数值模拟;分析了四管通道模型中螺旋折流片对强化传热和流动阻力随雷诺数的变化关系的影响.算例结果显示该新型结构可比相同尺寸的光管通道中的情形传热系数提高约40﹪～55﹪,同时也将伴随较高的流动阻力.可以相信螺旋折流片式换热器将会在许多工业 |
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Abstract: A number of different approaches have been used to assess bioavailability of Zinc in the feedstuff.The article introduced the basic princiles concerned in the present study,together with an indication of their major advantages or disadvantages.T
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文摘:本文扼要地介绍了目前评定饲料锌生物利用率的方法的基本原理以及这些评定方法的优缺点，并总结了使用不同方法所得出的评定结果，以供畜牧工作者参考。 |
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Abstract: A numerical model which can evaluate the movement of each individual occupant is developed,the model which divides a building setting into planar grids can described the position of each occupant at any point of time.The movement speed and direc
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文摘:将建筑物在平面上划分成能反映人员具体位置的几何坐标网格，根据不同人员在不同网格内的移动特性确定其移动速度，建立了描述人员疏散过程的数学模型，用场模拟的方法可以准确得到建筑物疏散时间和人员疏散轨迹，其仿真结果与国外同类软件对比具有较好的精度。 |
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Abstract: A numerical simulation on a flat plate,which has free coming flow at infinite distances-has been pro-cessed with pseudo-spectral methods.Boundary layer equations are dispersed with pseudo-spectral matrix di-rectly and computed.The results are co
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文摘:本文对平板在自由来流情况下的层流边界层用伪谱方法进行了数值模拟,直接用伪谱矩阵方法对边界层方程进行离散并编程计算,与经典结果相比较,发现本文结果较好,下一步研究工作有了可靠的基础。 |
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Abstract: A open enterprise management information system has four characters：generality,adaptability,compatibility and friendly interface.Based on AIBAS system,it describes that the prerequisites of open system are：open system model,structure,advanced de
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文摘:以AIBAS系统为例，论述了开放式系统应该具备的前提条件为：开放式系统模型，开放式系统结构，先进的系统开发工具，面向多企业功能的参考模型，面向对象的关系型数据库系统，业务应用程序接口，用户友好的操作界面。 |
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Abstract: A paint vapour treatment by means of blowing and drawing ventilation in an airtight workroom is suggested in the article.
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文摘:提出在密闭喷漆作业间，采用吹吸式通风法对作业间的漆雾进行治理的方案。 |
