Abstract:In this paper,we use some new techniques to deal with thd existence of limit-cycles and the boundedness of solutions of autonomous plane systems and obtain some new results.Then by using these results we study in detail the existence of limit-cycles and t

Abstract:In this paper we study the existence of nonoscillatory solutions of a kind of second order neutral functional differential equations.Our results hawe answered a problem in [2].

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Abstract:This paper is devoted to the studies of asymptotic behavior and boundedness of second order equation with unbounded retarded argument. We obtain some sufficient conditions for that all solutions of the equation are bounded or tend to some constant.

Abstract:The inelastic response of reinforced concrete plane frame-wall structures subjected to strong ground motions is studied from an analytical standpoint. In the analysis, the structure is idealized as the assemblage of prismatic members with two rigid zones

Abstract:Five new ion association complexes,cetyltrioctylammonium tetraphenylborate(CTOATPB),cetyltriphenylphosphonium tetraphenylborate(CTPPTPB),tetrabutylammonium diplicrylaminate (TBADPA), tetrabutylammonium Reineckate (TBARKS) and tetrabutylammonium phosphotun

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Abstract:An integral representation of the surface displacements of layered viscoelastic half-space subjected to normal harmonic exitation on the surface is deduced using transmission matrices. Based on it,a method is proposed to calculate the displacement and the

Abstract:This paper demonstrats the observability criterion of the magnetic-material film electron metallo-graphy made by analytical transmission electron microscopy. We deal with successfully the observations of bearing steel metallo-graphy and high chromium east

Abstract:The distribution of hydrostatic pressure and the influence of axial pressure and clearance,the main technical factors,on it during cropping under axial load are revealed by using elasto-plastic Finite Element Method. The relationship between the quality o

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Abstract:Lots of technology is proposed in the basis of gascar-bonnizer in order to meet with the unusual carbonittriding. In this way,the stability of gas flow,the stability of the pressure in the furnace,the stability of the manipulationn and the multipurpose wo

Abstract:The paper analyzes the principle of Multislope A/D converter utilized in the Model HP3421A data acquisition unit. The A/D converter interfacing circuit and control program flow chart controlled by the 8031 single-chip microcomputer are also given.

Abstract:This paper analyses the interprocess communication mechanism in the UNIX 4.2BSD with the emphasis on discussing the SOCKET structures and communication protocols. Comibined with some program examples,the communication methods of the SOCKET are describied.

Abstract:The Character model library VHZLIB for the national standard long imitation Song-Dynasty-style typeface vector Chinese characters & codes (symbols) is designed according to the requirements of the national standards GB/T 13362. 4-92 and GB/T 13362. 5-92.

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Abstract:In this paper, Frame-Shear wall structure is divided into frame substructure and shear wall substructure by cutting the connecting beams. The vibration equation for shear wall substructure is set up according to Timoshenko Cantilever beam. The vibration e

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Abstract:Based on practical study,this paper establishes 4 kinds of forecasting models, namely Revised Gray Forecasting model, Mutivariate Regression Forcasting Model, Multinomial non-linear Regression Forecastiong model and cubic exponent smooth model. They can b

Abstract:Using multivariate correlation analysis method and multiple index analysis of entropy technology, we turn the qualitative analysis of personnel benefit evaluation into quantitative analysis.