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  in engineering
     In this paper some methods that accelerate the operation speed of C25 FFT are proPDsed,which can reduce the operating time of the FFT with 1024 complex sample points to 12.6ms and serve as a reference in engineering.
     文中给出的几种提高C25FFT运算速度的方法,使1024复数点FFT的运算时间减少到12.6ms,可供工程应用参考。
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     ,and the error of phasemeasurements,Δ(?) . Distribution curves of the error of RCS measurements are given as areference in engineering.
     本文首次分析了 RCS 测量误差与相位ψ,相位误差△ψ的定量关系,给出了 RCS测量误差分布曲线,可供工程应用参考。
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     On the basis of the theory of water hammer, a formula of calculating the water hammer pressure in double circling pipeline for water supply is derived which might serve as a useful reference in engineering designs.
     本文根据水击基本理论,推导出双环给水管网水击压力的计算公式,并用数值计算例题加以说明,可供工程设计参考。
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     According to the connecting way that a section of elements is not connected fully in parallel in an assemlling shunt capacitor, this paper derives a formula of open delta voltage protection for application in engineering design.
     根据集合式并联电容器内部一段元件非全并联的接线方法,从电路原理上,推导了这种接线方式的开口三角电压保护的整定公式,供工程设计中参考应用。
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     Based on the test, practical measurement and experience in engineering applications during recent years, this paper deduces a formula suitable for calculating horizontal bearing load on the bottom of column and applicable to engineering.
     本文根据几年来的试验实测和工程实践积累的经验,推导出一种适用于桩基水平承载力的计算公式,可供工程中应用。
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     4. Limit analysis was conducted on a series of parametric analysis models with different values of d/D, t/T and D/T.
     4.对不同d/D、t/T以及D/T值的容器结构建立系列化、参数化模型作极限分析,得到可供工程应用的极限载荷的经验公式。
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     Based on the stress distribution assumption of Cross Section,approximate formula for calculating the flexural capacity of the composite member with prestressed concrete pipe pile and pile core concrete is proposed theoretically.
     本文基于管桩──桩芯砼组合构件截面的应力分布假设,从理论上探讨并提出了预应力砼管桩──桩芯砼组合构件受弯承载力的近似计算公式,可供工程界设计时参考应用。
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     The optimization criterion proposed in this paper leads to a deviation within ±10% conpared with experimental data and is satisfactory for R-11, R-12, R-22, R-113.
     根据所收集到的实验数据及作者的实验结果,提出了优化设计的概念与方法,并整理出适用于R—11、R—12、R—22、R—113及R—114的大空间核沸腾的优化设计关联式,与实验数据比较,其相对偏离度一般不超过±10%,可供工程设计使用参考。
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     The S-N equation presented can be used as reference for ergineering design
     同时,给出的S-N方程供工程设计参考。
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     Basic concepts,technical terms and applications of geological theory related to engineering geology are deeply discussed together with a practical project,and all mistakes and blurred understanding of them are corrected and clarified in this paper.
     本文针对工程地质工作实践中碰到的几个有关工程地质的基本概念与术语以及地质理论的应用问题 ,结合工程实际工作展开讨论 ,纠正与澄清有关错误与模糊认识 ,供工程地质工作者借鉴与参考。
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     It is of great value for reference to the similar works.
     可类似工程参考
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     This paper can give reference to projects application.
     可工程应用参考。
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     知识工程
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     Supply And Demand Information
    
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     Ecological System and Engineering
     生态系统和工程
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  in engineering
For a class of data often arising in engineering, we have developed an approach to compute the lower confidence limit for structure reliability with a given confidence level.
      
So the proposed model in this paper is easy to be used in engineering practice.
      
Based on the physical control theory, comparison was carried out of two approaches to optimizing the dynamic controlled plant with the aim of achieving the desired performance of the closed loop formulated in engineering terms.
      
Enumeration Conservation Law and Natural Parallelism of the D-algorithms for Test Generation and Modeling in Engineering Diagnos
      
Fundamentally new devices, the working substance of which is a gas heated to high temperatures, have been undergoing intensive development recently in engineering.
      
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In 1939, the importance of the nonlinear features in the shell buckling problem was first pointed out in a most spectacular manner by Von Karman and Chien, but the mathematical difficulty is so great that progress has been slow after the first attempts. According to our experience, we should face the difficult barrier of solving nonlinear partial differential equations and an effective, simple, accurate method is required. With this in mind, we suggest the modified iteration method. four cases are considered...

In 1939, the importance of the nonlinear features in the shell buckling problem was first pointed out in a most spectacular manner by Von Karman and Chien, but the mathematical difficulty is so great that progress has been slow after the first attempts. According to our experience, we should face the difficult barrier of solving nonlinear partial differential equations and an effective, simple, accurate method is required. With this in mind, we suggest the modified iteration method. four cases are considered to verify it. Here is one of the cases in which nonlinear stabilities of thin circular shallow shells under actions of axisymmetrical uniformly distributed line loads are considered. As special cases, we have also investigated large deflections of plates under the same loads. All these results are presented in such a form that direct application in design is possible. Two stability curves coincide with the experimental results given by D. G.Ashwell and Chien Wei-chang. The results have also been compared with several other writers'.

本文对边緣簡单支承在对称綫布载荷作用下园底扁薄球壳的非线性稳定問題进行了研究。用我們提出的修正迭代法求出了决定上下临界載荷的二次近似的解析公式並画成曲綫以供工程应用。作为特殊情况,我們附帶地得出了边緣簡单支承中心集中载荷作用下的园底扁薄球壳的非綫性稳定問題,边緣簡单支承在对称线布載荷作用下和中心集中載荷作用下的园板大撓度問題的解。所得結果和两种不同的实驗进行了比較,理論值和实驗值相当符合。对于中心集中載荷作用下的园板大挠度問題,我們的結果和文献[16]用摄动法得到的完全相同。

The helix coupled vane and helix coupled bar circuits belong to a new type of slow wave structures for high power crossed-field amplifiers. These circuits are characterized by their very wide bandwidth, relatively high coupling impedance as well as high average power-handling capability, and hence obtain wide applications. Both multi-conductor transmission line method and equivalent circuit method are used to carry out theoretical analysis of these SWSs. Analytical expressions for dispersion characteristic,...

The helix coupled vane and helix coupled bar circuits belong to a new type of slow wave structures for high power crossed-field amplifiers. These circuits are characterized by their very wide bandwidth, relatively high coupling impedance as well as high average power-handling capability, and hence obtain wide applications. Both multi-conductor transmission line method and equivalent circuit method are used to carry out theoretical analysis of these SWSs. Analytical expressions for dispersion characteristic, coupling impedance and transverse field distribution are derived; the effects of each dimensional variation on dispersion characteristics and coupling impedance are given on the basis of a large quantity of computer results. A comparison between computed and experimental values indicates that results given in this paper are sufficient for engineering design purpose.

螺旋耦合型慢波结构,是近年发展起来的一种大功率正交场放大管慢波线。它具有较宽的带宽,较高的耦合阻抗,较大的平均功率容量,易于实现宽带传输匹配,因而获得了比较广泛的应用。本文采用多导体传输线及等效电路方法,对这类慢波结构进行了理论分析,导出了色散特性和耦合阻抗的解析表达式,计算了场的横向分布,运用大量的计算机结果,讨论了慢波结构各个尺寸对色散和耦合阻抗的影响。实验结果证明,本文所给出的结果可供工程设计使用。

The stator core resonance of hydro-electric generator caused by negative-phase-sequence current is a new problem encountered in recent years in this country, and to our knowledge, scarcely known abroad. In this paper, the formulas for natural frequency and amplitude of the core standing wave vibration are derived. A comparison of test data taken on a 60 MVA generator with calculation results shows that the natural frequencies obtained are close to those measured. Discrepancies are, however, found between the...

The stator core resonance of hydro-electric generator caused by negative-phase-sequence current is a new problem encountered in recent years in this country, and to our knowledge, scarcely known abroad. In this paper, the formulas for natural frequency and amplitude of the core standing wave vibration are derived. A comparison of test data taken on a 60 MVA generator with calculation results shows that the natural frequencies obtained are close to those measured. Discrepancies are, however, found between the calculated amplitudes and the measured ones, particularly at low I2%, yet at higher I2(74%), the discrepancies are shown to be within reasonable limits.

本文从理论上分析由负序电流引起的定子铁心振动.推导了固有频率和振幅的计算公式.文中介绍了水电站试验实测的部分结果,将计算值与实测值相比较,可见固有频率的计算值比较接近实测值,可作为设计电机的依据;振幅的计算值与实测值相差较大,但仍有一定的准确性,可供工程计算作参考.

 
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