Abstract:This paper proposes a block order-descending method to determine the M-Matrix and S-Matix, which needs less computational work. In the meantime, some sufficient and necessory conditions are obtained for the solvability of the inverse problem Ax=b in M-Mat

Abstract:In this paper,flame atomic absorption spectrometry(FAAS) using the slotted atom-trapping technique(SATT)with a quartz tube was studied for manganese determination. The effects of air current, position of light beam,position of flame combustioner and struc

Abstract:The catalyst CP-B was first used for production of chlorinated low density polyethylene(LDPE),so the reaction time was successfully shortened.The influences of the reaction temperature,the reaction time,the proportion of solvent to LDPE,the chlorine flow

Abstract:Microcomputer controller for drum mixer can continuously measure aggregate being fed to the mixing drum,calculate and control the amount of required asphalt according to a preesribed mix ratio. The measurement errors of the amount of aggregate and asphalt

Abstract:In this paper,the telation between sensitivity and defect is discussed for detecting plane defects using the X-ray photograph. We propose the concept of the critical width.The critical width for the middle and thin plates is O.O1mm.

Abstract:This paper gives a solution to the optimum inventory program by using geometry progamming method.It do not have the limitations and conplexity of conventional method,and provides an economic analysis on the optimum inventory program.We also point out suff

Abstract:This paper presents a parts description method based on the idea of feature modelling.The method has been used in CAPP system and has good result in practice.In order to seek the possibility of integrating CAD with CAPP,we also try to make a good combinat

Abstract:Based upon generalized inverse technique in matrix theory,a group of general matrix-type modification formulas of dynamical models is derived in this paper. Most of the existing matrix-type modification formulas of dynamical models can be considered as pa

Abstract:The present paper studies the applicability of composite concrete beams to building and bridge structures. The ultimate flexural and shearing strength, the flexural stiffness, and the width of cracks of a series of composite concrete beams are analysed an

Abstract:In this paper, a rectangular element with high precision is presented. It is suited to analyzing shear-wall structures, and make up the deficiencies of other elements for plane problems. An example solved by the new element are given.

Abstract:This paper applies the finite element semi-analysis method and the theory of fracture mechanics in the analysis of the crack of semi-rigid pitch road, based on the spatial mechanic model. The analysis is more realistic than the conventional ones in which

Abstract:In this paper the wave theory is applied to study the propagation and reflection of the transient waves excited by hitting the top of piles,to explain the constitution of the response on the top and to derive the expressions of the amplitude and phase spe

Abstract:This paper deals with the vibration isolation principle of a system with a negative stiffness spring and the energy analysis for this system.As an application of the method, an example of vibration systems with equal frequencies is given. It shows that th

Abstract:In this paper, the four significant pictures,their characters, and their relations are discussed. The similarities and differences of these pictures applied to problems of the same quantum state are compared. The discussion and analysis shows that the fou

Abstract:In this paper we investigate the oscillation of a kind of first order neutral delay differential equations. Some sufficient conditions for the oscillation of all solutions and the existence of non-oscillatory solutions are obtained. Our results solve seve