最新刊期
      卷 16 ， 期 4 ， 1994

      • STATICAL SHEAR STRENGTH ON COUPLING BEAMS OF REINFORCED CONCRETE

        Vol. 16, Issue 4, Pages: 1-10(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.001
        摘要：On the basis of a statical test of 16 specimens of coupling beams in shear walls,which consist of 10 specimens with ordinary rinforcement and 6 specimens with composite reinforce-ment,the statical behaviors of the coupling beams with two different types of reinforcement arestudied.It is concluded that the flexural strength 0f the beam should be multiplied by a reductionfactor when the span-depth ratio is less than 2,and the shear strength is not influenced by the span-depth ratio and may be obtained with unified calculation formula.  
          
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      • A CALCUTATION FOR THE WORKSPACE OF A HYDRAULIC EXCAVATOR

        Vol. 16, Issue 4, Pages: 11-16(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.002
        摘要：In this paper,the parametric equation of a hydraulic excavator workwpace areestablished by using the spatial mechanism theory of robot.Characteristic points of the workspaceboundary are searched by the optimization procedure and the calculate formula of area of theworkspace longitudinal section is found.  
          
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      • Wang Shumao
        Vol. 16, Issue 4, Pages: 23-34(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.004
        摘要：At the preliminary design stage of a building, it is neccssary to determine thebeam and column cross-sectional sizes of frame strtictures.According to some provisions of the"Building Aseismatic Design Code"(GBJ 11-89),main factors having influence on the beam andcolumn cross-sectional sizes are analyzed.and calculating formulas for the determination of the beam and column cross-sectional sizes which are satisfied the restrained condition of horizontal dis-placement of a building are derived in this paper.  
          
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      • RESEARCN OF MODEL OF AUTOMATIC CHECWEIGHER

        Vol. 16, Issue 4, Pages: 35-39(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.005
        摘要：Generally,a second order spring-damper system is used to represent the model ofweighing sensor in checkweigher. It only represents one part of checkweigher.In this paper,accord-ing to the relationships of individual parts of checkweigher and main disturbance source,a model isproposed for whole checkweigher.It is proved by simulatlon that this model is in a good approxima-tion.  
          
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      • Vol. 16, Issue 4, Pages: 46-51(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.007
        摘要：This paper analyses several problems in the work of in vetmen t of fixed assets.The present macroscopic adaptive control policies of the governmen t and their correspondent mea-sures are taken into account.Suggestions of crucial aspects of adaption and the macroscopic adaptive mechanism are discussed.  
          
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      • Luo Wankang
        Vol. 16, Issue 4, Pages: 52-66(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.008
        摘要：By comparing the tests of prestressed and nonprestressed brick masonry walls with peripheral beams and Constructional columns, under cyclic lateral loading,the apperaence and development of Cracks,failure mechanism,hysteretic behavior,strength,stiffness,ductility and ener-gy dissipation of the brick rnasonry walls arc studied.Only the crack resistance and bearing capacity of walls are discussed in this paper.It is shown that prestressing on brick masonry wall can obviotisly improve its seismic behavior.Morcover,calculating methods for the crack resistance and the ultimate bearing capacity are presented,and the caculating results are identical with the tests.  
          
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      • Vol. 16, Issue 4, Pages: 67-71(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.009
        摘要：The process of treating slaughterhouse wastewater in a gas-liquid-solid fluidizedbed bioreactor is studied,and the factors of affecting reactor performance are a nalysed in this pa-per.Some design parameters and experiences are obtained through the pilot experiment.  
          
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      • AN INSTRUMENTAL VARLABLE METHOD USING CORRELATION FUNCTIONS

        Song Shouxiang
        Vol. 16, Issue 4, Pages: 72-77(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.010
        摘要：This paper introduces an instrumental variable method using estimates of corre-lation function including autocorrelation function of mcasurment noise to estimate the parameters oftransfer function. It is a three step estimation procedure. A higher estirnation accuracy can be ob-tained by selecting a model with appropriate order.  
          
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      • MINIMAX INEQUALITY FOR VECTOR-VALUED FUNCTION

        Li Shengjie
        Vol. 16, Issue 4, Pages: 79-82(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.011
        摘要：Minimax inequality is proposed in this paper.The minimax inequality for affinecontinuous vector-valued mapping is established.A kind of the minimax inequality for set-valuedmapping is derived.  
          
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      • Vol. 16, Issue 4, Pages: 83-88(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.012
        摘要：This paper presents the end-effect factor of Synchronous motor with cylindricalsolid rotor offered by analysing the 3-D electromagnetic field and using the Poynting vector.To ap-ply it in an actual calculation,the end-effect factor is proved correct and applicable.  
          
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      • SOME PROBLEMS OF DESERVED RESEARCH IN THE PROCESS OF GAS DESULPHATION

        Vol. 16, Issue 4, Pages: 89-95(1994) DOI: 10.11835/j.issn.1674-4764.1994.04.013
        摘要：Many factors have influence on gas desulphation,Through theoretical a nalysisof desulphation reaction principle and a lot of experiment and production data,this paper studies withthe emphasis on how to solve some concrete problems about selecting and mixing desulphation solu-tion in order to gain the best economic benefits and environment benefits and social comprehensivebenefits.  
          
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