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15 March 1995, Volume 14 Issue 1 Previous Issue    Next Issue

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Infinite-Sample Properties of Principal Component Estimation Yang Hu 1995, 14(1): 1-7.  Abstract ( )   PDF (311KB) ( )   The biased estimates proposed to overcome the ill-conditioned of the design matrix has made considerable headway inthe theory and method,which is used extensively in practice. The principal comconent estimate is one of the importantmethods which has been studied by many pepole. The infinite-sample properties of the principal component estimate aregiver in this paper. References | Related Articles | Metrics

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Dislocation Dynamics and Solid Tuibulont Luo Shiyu,Shao Mingzhu 1995, 14(1): 8-13.  Abstract ( )   PDF (274KB) ( )   In the paper the nonlinear dynamics of crystal dislocations have been strudod in the presence of an external periodicfield,the threshold value of chaos has been induced,the cascading bifureations have been discussed,the chaotie andnon-chaotic regions in a parameter planeδ/α～Ω have been given. References | Related Articles | Metrics

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A Study on the Further Development of Composite Material Used in Long Span Cable-Stayed Bridges Zhang Xixiang,Gu Anbang 1995, 14(1): 14-20.  Abstract ( )   PDF (396KB) ( )   According to the study of the history and the trend of development of the cable-stayed brides,based on the studyand practice of composite materials used in bridge structure,it is pointed out that the development of cable-staysed bridgehas now entered its 4th stage,i.e. the stage of new type matterial cable-stayed bridge,The comprehensive abvantagesof the technology and economy,trend of development,structure,design as well as constructin of long span cable-stayedcompsite material bridges is discussed,too,in this paper. References | Related Articles | Metrics

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The Application and Analysis of A New Type Semi-Cloverleaf Semi-Directional Compounded Interchange Sun Jiasi 1995, 14(1): 21-26.  Abstract ( )   PDF (411KB) ( )   In this paper,a new type diagonal interchange compounded by semi-cloverleaf and semi-directional type is recom- mended.It is a alternative with a new configuration,a closely arrangement and a beautiful appearance. It can coordinatethe environment arround the interchange and can be amployed in urban distriets and mountainous where therc are restric-tios of topograph and culture. This new type interchange has been adopted in HuangHuayuan interchange in the southernend of JiaLingRive bridge of Chongqing.In this paper,also,the classification system and type of semi-cloverleaf+semi-directional compound interchange isanalysed and the views on the design rnlar of interchange alternative is presented. References | Related Articles | Metrics

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Practical Calculation of the Lateral Stability of the Midhight-Deck Arch Bridge Xiang Zhongfu 1995, 14(1): 27-31.  Abstract ( )   PDF (256KB) ( )   Based on the study on the lateral stability of the deek-type and bottom-road arch bridge,a practical formula to deter-mine the critieal load of the lateral stability of the midheight-deck arch bridge is given. References | Related Articles | Metrics

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Systematic Method of Asphalt Pavement Maintenance and Rebuilding He Zhaoyi,Deng Xuejun 1995, 14(1): 32-37.  Abstract ( )   PDF (308KB) ( )   In this paper,a systematic method, multi-layered method, is introduced to analyse the countermeasure of asphaltpavement maintenance and rebuiiding, The countermeasure of pavement maintenauce and rvebuilding, making use of thismethod, may be presented based on the single index and considering the different weight codfficients of the indexes. References | Related Articles | Metrics

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An Analysis on the Ageing Property of Three Asphalts Yuan Jianan, Zhang Dengliang 1995, 14(1): 38-46.  Abstract ( )   PDF (430KB) ( )   In this paper,based,on the comparison between the DSC pictures and GPC pictures of three China-made asphalts be-fore and after ageing, the endothermic peak of the samples are analysed, in the same time,the perceentage of the spaceoccupied by the different molecular weight before and after ageing, with the help of GPC pictures, is calculated, and the appraisal of the ageing property of the three asphalts is also presented. References | Related Articles | Metrics

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Study on the Performance Index of Bituminous Pavement Li Guoqiang,Jiang Zhiren 1995, 14(1): 47-55.  Abstract ( )   PDF (473KB) ( )   Based on the essences of asphalt pavement performance,a comprehensive quantitzed norm CSI is put forward to de-scribe the property. Thus, the bituminous pavement design is carried to a new field. In addition, some problems arisingin the structural edsign of asphalt pavement with the aid of CSI and the possible ways of solving them are discussed,too. References | Related Articles | Metrics

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Theory and Practice in the Mechanical Construction System of the Asphalt Pavement(Ⅲ)──The Motion Law and Mathematical Description of Construction Machinery Guo Xiaohong,Guo Jiaying,Du Zhengde 1995, 14(1): 56-65.  Abstract ( )   PDF (460KB) ( )   According to the technology of mechanical construction system of the asphait pavement,the motion law and mathe-matical description, based on the documents (Ⅰ)and(Ⅱ),is prasented in this paper. References | Related Articles | Metrics

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Theory and Practice in the Mechanical Construction System of the Asphalt Pavement(Ⅳ)──The Make up of Construction Machinery and Appraisal Guo Xiaohong,Guo Jiaying,Du Zhengde 1995, 14(1): 66-76.  Abstract ( )   PDF (505KB) ( )   The combination problem of construction machinery and appraisal is solved in this paper. References | Related Articles | Metrics

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A New Regression Formula of Tensile Stress in the Middle Layer of Three-Layer Flexible Pavement Huang Wei,Tang Yimin 1995, 14(1): 77-80.  Abstract ( )   PDF (222KB) ( )   The regression mathematical model of tensile stress in the middle layer of the three-layer flexible pavement is basedon the analysis of elastic multilayer thery. he new regression formula of tensile stress in the middle layer of convention-al three-layer pavement is obtained by regression theory. A number of results of regression frmula show good accuracyfor engineering application. References | Related Articles | Metrics

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The Preliminary Plan and the Coumtermeasure to Develop the Shipping of the Upper Reaches of Yangtze River Huang Guocai,Chen Dezhang 1995, 14(1): 81-85.  Abstract ( )   PDF (351KB) ( )   In this paper, the characteristics of the water resources and the river system distribution of the upper reaches of theyangtze river are analysed and the preliminary plan and the countermeasure to develop the shipping of this region are pro-posed. References | Related Articles | Metrics

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The Application of Newton’s Method to Hydraulic Calculation about Branches of a Channel Xu Guangxiang 1995, 14(1): 86-94.  Abstract ( )   PDF (467KB) ( )   First, in this paper, the energy equation is described in a simple form. Then, according to basic method of hydrauliccalculation about branches of a channel and basic principle of extraction the root with Newton’smethod, the formulas ofinitial value and increment of Newton’s sucessive approximation(double equations)to calculate the folw dividing of branches of channel is established.It is clear that this method can speed up computation rate and improve accuracy of theresults by example. In addition, the difference between Newton’s method for double equations and usual Newton’s methodis analysed,and the geometric implication of Newton’s method for double equations is discussed,and the method of deter-mining section of flow dividing and flow together is also explained. References | Related Articles | Metrics

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Mechanical Design Knowledge Representation Based on Fuzzy Decisions Miao Yi 1995, 14(1): 95-99.  Abstract ( )   PDF (284KB) ( )   It is widely agreed that an important problem in AI is the representation of commonsense knowledge. combined withthe study on the mechanical design expert system, a new knowledge representation method used to select the material ofspare parts based fuzzy decisions is presented in this paper. With the quantification of the knowledge and experienceof designing engineers, the expert system with the aid of this method can make decisions to select the most suitable materi-al after making simple numerical calculation and judgement of threshold value. It is indicated that the new method has leftout the complex inference and raised the design efficiency. References | Related Articles | Metrics

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An Algorithm for Drawing Section Plane Lines Liu Deyan 1995, 14(1): 100-103.  Abstract ( )   PDF (219KB) ( )   This paper researches into an current aigorthm of drawing section plane lines of plane graphics with arbitray circlearc. A method of expanding vector product in 2D plane to 3D space is presented. The problem deciding effective intersec-tion of straight line intersecting circle are is solved by using vector method. References | Related Articles | Metrics

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Communication Skills in Negotiation Wang Shuyun 1995, 14(1): 104-111.  Abstract ( )   PDF (557KB) ( )   This article devotes a discussion to the skills of verbal and non-verbal communication in negotiation. References | Related Articles | Metrics

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The Application of the Chain Possibility of Matrix in Combination Mathematics Yuan Nanqiao 1995, 14(1): 112-118.  Abstract ( )   PDF (347KB) ( )   In the paper, based on the study on the chain possibility of matrix, the properties of combination and the applicationin combination mathematics are presented. References | Related Articles | Metrics