最新刊期
      卷 16 ， 期 3 ， 1994
      • Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.001
        摘要：On the basis of the results of static tests of the full-scale subassemblage of exte-rior joints in reinforced concrete frames,and with reference to other experimental results of homeand abroad.This paper analyses the load-earrying capacity of the anchorage end of 9O-degree bentbeam reinforcement in the exterior joints,verified the horizontal development length of this kind ofanchorage end Specified in the state standard' Concrete Structure Design Code',and proposes im-provements for the design concrete and specification for this kind of anchorage end.  
          
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      • TNE EXPERIMBNT RESEARCH OF PT THIN FILM USED IN INFRARED DETECTOR

        Sun Xiaosong, Sun Xiaonan
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.002
        摘要：The preparation technology and thermal treatment PT thin film used in infrareddetector and photo-electron devices are studied. The er thin film prepared by multi-ion-beam reac-tive co-sputtering apparams are analysised by x-ray , XPS and EPMA. The impurity of PbO,Pb2Ti2O6 in PT thin film is eleminated and PbTiO3 (001)preferred orientation is improved. The rea-sonable teperature of substrates is given in this paper.  
          
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      • RESEARCH ON SEDIMENTATION TECHNOLOGY OF SQUARE-WITH-GAPTUBE

        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.003
        摘要：Researches show thatquare- with- gap tube has advantages of better hydraulicconditions, broad adaptability for treatment of various raw waters and high sedimentation efficien-cy. A contrast experiment is carried out between squarewith- gap tube and hexagonal tube. The for-mula of hydraulic character parameter is deducetl for square-with- gap tube provides to theoreticalbaqe for practical application of square-with-gap tube.  
          
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      • THE STUDY ON INVESTMENT EFFECT OF OLD URBAN DISTRICT REGENERATION

        Fu Hongyuan, Kan Naigui, Lan Ling
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.004
        摘要：The problem of old urban district regeneration has to be solved in process of ur-ban development.According to the practice of urban construction and the current situation of urbandevelopment in our country,solving this problem is very urgent. At present.there is fewer discussionon old urban district regeneration from its economic and social effect; In this paper.by means of an-alyzing old urban district regeneration and its investment effect, a set of criteria evaluating the in-vestment effect of old urban district regeneration is eastablished. For the first tirne, a new method. Set Statistics-AHP (The Analytic Hierarchy Process)-Entropy method is adopted to evaluate the in-vestment effect,and successfully solve two critical problems,individual criterion evaluation and crit-era' s weight.  
          
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      • Long Tengrui, Guo Jingsong, Tu Min, Hao Yiqiong
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.005
          
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      • Lu Tieying, Zhao Qing, Lu Ping
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.006
        摘要：Based on the static and fatigue test by two-way loads for the right-angle typesudden change supporting of steel crane beam,the stress of the plates for the sudden change support-ing and influence of the load circlative rate on the stress of web around the sudden change points arestudied. The characteristics of the fatigue failure of this crane beam are given a minute description.Some technieal measures are put forward in design and construction.  
          
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      • A SYSTBM OF SAVING VENTILATION ENERGY POR MULTI_STORIED HEALTNY BUILDINGS

        Chen Qigao, Feng Ya
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.007
        摘要：A sving energy system can get natural ventilation in the storied healthy build-ings with air condition or heating. The principal component of this system is an efficient heat ex-changer made of a set of heat pipes. This system can be operated between two sides of one floor slabto change the energy carried both by the hot air flow and the cold air flow, This svstem can make aspossibly keeping indoor air fresh with a little energy air loss only. It is possible for using this systemto cure a sick building into a healthy building. This system can be put dperation between both thepipes of waste air flow and fresh air flow for an integrated air conditional svstem with fresh air.  
          
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      • THE APPLICATION OF TNE SPATIALLY MECHANICAL THEORY OF ROBOT

        Zhang Rongrui, Su Zhangdao, Yin Yongfeng
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.008
        摘要：A kinematic simulation model has been designed for a cantilever manipulator ofhydraulic exacvator and the kinematic performance of a 20 t hydraulic excavator' s cantilever ma-nipulator is simulated on IBM-PC/XT microcomputer.  
          
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      • Wang Pu, Yao Yulin, Chen Mingquan
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.009
        摘要：This paper introduces conclusively the materlal properties,the model comparisontest , the produtive comparison test,and the formula of clean filter bed of cordierite-mullite medium.Almost all the parameters of cordierite-mulli te medium are better than those of sand medium.  
          
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      • Yao Gang
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.010
        摘要：Tnis paper analyses the construction scheme alternative of form systems of high-rise dwelling wall with fuzzy mathematics method,This idea,concentration method is put forward byBlin and it corresponds with engineering facts.  
          
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      • SOME EXPERIANCES AND PROBLEMS IN CHIN A OLD CITY RECONSTRUCTION

        Huang Guangyu
        Vol. 16, Issue 3, (1994) DOI: 10.11835/j.issn.1674-4764.1994.03.011
        摘要：Through a historical review of China old city reconstruction and practices in cityplanning,this paper presents six basic problems in old city reconstruction.  
          
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