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.

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.

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.

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.

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.

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.

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.

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.

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'.

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.

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.