摘要:In this paper, we generalize the paper [2] on the existence of positive solution for the second order neutral delay difference equations with variable coefficients, and study the case of the third order.
摘要:In numerical solution of constant difference equations initial value problem, this paper add an approximation of Lagrange remainder on Eule method in order to result in a higher precision, hence construct a new calculate mode.
关键词:initial value problem;numerical solution;Lagrange remainder
摘要:Supposing there is S≥2 , the linear indefinite equation in S variables refers to the following form: a1x1 + a2x2 +…+ ascs = n , in which ai (i = 1,2, …, s ) and n are given integral numbers, a1 a2… as ≠0. This paper provides a structural formula of integer solution for the above form by means of division algorithm of S variables a1,a2,… , as.
关键词:indefinite equation;solution vector;greatest common factor
摘要:In this paper, we discuss the Matrix equation AXB = C (A and B are inverse) and give the formula of the general solution by determinant. Finally, we point it out that it is important generalization of cramer’s rule.
摘要:In the light of the need in designing the practical circuits using 555 device, in this paper we have measured the output characteristic curves and analysed the load characteristisc of this circuit. Thus, we have provided the necessary reference data for the design and application of this device.
关键词:Circuit of timebase;Push - pull circuit;Load capacity;Output resistance
摘要:In this paper, diffraction integral equations and Bessel Functions are used to getting perfect solution of Fraunhofer ring aperture diffraction, and the diffraction pattern is analysed.
摘要:In this paper, we use column chromatography and spectrophotometry to separate and determine the yellow、 orange、 red pigments and capsaicin from red pepper, we study the separating effects using different stationary phase and mobile phase. It has turned out that the best stationary phase is silica gel with n - hexane and petroleum ether - aceton as mobile phases.
摘要:Ozone as a disinfectant is used extensively in various regions. It is intensely concerned because of its properties of no- residual、 no- pollutional、safe and effectual.
摘要:The chopper mode cascad control closed - loop system was in troduced in this paper. It can take - off and hold constant pressure with high power factor. The energy - saving operation plan makes it available that the flow volume of compressed - air is proportional to the rotating speed of spindle.
关键词:compressor;Cascad Control;chopper;power factor;PWM;sourse of power
摘要:The method and procedure of measuring and calculating involute spur gear geometrical parameters such as tip diameter, module, modification coefficient and pressure angle were shown in this paper.