摘要:On the base of comprehensive analysis on the convex spheroid machining method by whirling milling, the mathematical model is established and calculating formulas and determining method of relative parameters are presented in this paper.
摘要:This article introduces the method to calculate arc tooth thickness of bevel gear by spherical involute equate, and indicates the theory error to calculate arc tooth thickness by equivalent cylindrical gear with example.
关键词:bevel gear;arc tooth thickness;tooth profile in back cone;equivalent cylindrical gear
摘要:The generator rotor is a flexible body with approximately equal horizontal and perpendicular stiffness. The natural frequency of the rotor is related to rotor itself, but it is also related to the degree of unsymmetry of load when the load of generator is unsymmetric. And we also found that the natural frequency appeared separating phenomenon with the changes of inciting currency.
关键词:unsymmetry loads;natural frequency;separating phenomenon;magnetic energy
摘要:In this paper, We are concerned with oscillation of solution of the third order neutral delay difference equation with variable coefficient, two sufficient condition is obtained for oscillation of all bounded solutions of the equation.
摘要:In this paper, We discuss the Near - ring about addition and multiplication of mappings on abel group when it keep zero unchanged and prove it is a zero - symmetric Near -ring with abelian addition and identity, finally, we discuss the ideal of the Near - ring, and give its several left and right ideals.
关键词:mapping;zero - symmetric Near - ring;(left, right)ideal
摘要:This paper analyses the factor of beauty in probability theory and statistics by means of aesthetic of mathematics, provides a valuable reference for aesthetic education in teaching probability theory and statistics.
关键词:beauty of mathematics;beauty of method;beauty of language;beauty of structure;beauty of shape
摘要:In this paper , We give the description of inertial system by presenting the properties of space - time in it. Based on the use of the properties of space - time and Lagrange’ s equation, we obtain the three mechanical conservation laws.
关键词:inertial system;closed system;symmetries of space- time;Lagrange’s equation
摘要:In this paper, we have studied the main factors that affect the saponification rate of ethyl acetate. The factors include the properties of the solvent, the presence of some substance in solvent.
摘要:In This text primary probe into replace dropping mercury electrode -with solid electrode as work electrode, determination of content of trace element by oscillographic polarogra-phy at the same time, and apply to environmental monitoring analyse. Experiment have proved that it is elemental analytical method of simple easy to operate, quick, object, nonpoisonous, no pollution, and also stablity and reproducibility is fine, and it can be applied and disseminated.
摘要:This paper introduce the optimal solution to the problem of optimizing time and cost by setting up a tableau and modifying the tableau step by step. This method is characterized by intuition and simple operation.
关键词:Time and cost optimization;Float;Critical path