最新刊期
      卷 16 ， 期 1 ， 1994

      • SBVERAL PROBLEMS ON BACKANALYSIS OF LANDSLIDE WITH A VARIATIONAL METHOD

        ZhuFan
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.001
        摘要：The shape,position and stress distribution on the sliding surface can be rationallydetermined by a variational method.And the method satisfies the equilibrium,yield condition and thetransversal conditions for the unknown position to determine the critieal height of a slope when theslope angles and the material parameter C and are known.This paper corrects some ertors existingin the current literature and presents two curves to facilitate deterimination of the critical height andthe cracking position appearing on the top surface of the slope.These curves are particallarly suitedto backanalysis of landslide when the cracking position,the originally slope angle and the failuredslope height are known or can be estimated.Finally,calculated examples are cornpared with currentliterature.  
          
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      • Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.002
          
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      • ON THE EXISTENCE OF LIMIT CYCLES OF A CLASS NONLINEAR EQUATION

        Zhang Mou
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.003
        摘要：This paper uses the Poincare-Bendixson's annular region theorem with existenceof limit cycles of a cfass of nonlinear differential equation.  
          
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      • Liu Dongyan, Zhu Keshan
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.004
        摘要：The cement mortar specimens with a central slits are tested under uniaxial com-pression.The test results show that tensile cracks initiate,as a rule near the tip and may propagatesteady for a certain length.Mean while shear fructures appear and propagate slowly to the failurestate in the zone of compressive stress concentration. So the fracture strength of rock under compres-sion might be differentiated into the initial tensile strength,the peak strength and residual strength.  
          
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      • SEVERAL PROBLEMS CONCERNING VILLAGE PLANNING

        Xiong Desheng
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.005
        摘要：This paper deals with improving the ability of villages in flood resistance bychosing their location in higher land and adding to fundament height of rural houses and other mea-sures.reasonable concentration in rural settlements distribution.Planning and constrstiction of ruralpublic services and facillties,etc.in order to promote agricultural mechanization and urbanizationalchange and enhancement of living standard in rural area.  
          
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      • A SURVEY STATION OF MEASURING DAYLIGHT AND SOLAR IRRADIANCE IN CHONGQING

        Zhang Qingwen
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.006
        摘要：This paper intreduces a survey station of measuring daylight and solar irradiancein Chongqing.It has been set up for responding to the International Dayllght Year.From the ways ofmeasuring place,instruments,data and results,etc. the station has run successively in two years tomeasure eleven data about irradiance and illumination etc. by automatic measuring systems.A vastamoun t of scientific data is collected and these firstha nd reliable in formations are provided to day-light climates research in Chongqing.Both data results and measuring means corne up to advancedworld standards.Modern science and technology are successfully applled to daylight measuring andresearch.  
          
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      • Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.007
          
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      • Huang Hengdong
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.008
        摘要：This paper presents a problem of scientific decision of strategic importance insafety in vestment of fire protection and discusses the scientific con notation,far-sightnese,two-wayability,sychronism and effectiveness of the problem.On the basis of similar action principle of deter-minable multifactors,the main point,strentth and the suggestions of scientific manage system insatfety investiment of fire protection are advanced.  
          
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      • PLANNING AND IMPLEMENTATION OF FIRE PROTECTION FOR HOSPITALS

        Zheng Jie, Zhao Chunhui
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.009
        摘要：This paper discusses the risk and features of conflagration in hospitals,the spec-ification and implementation of fire protection system,the measurement and test of fire-fightingsystem and evacuation against ernergency.  
          
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      • Xie Yongmao
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.010
        摘要：This paper presents that D,yn11 is recommended as the connection mode of dis-tribution transformer in distribution system with three-phase unbalanced loads,and Y,yn0 is not inthe electric design standards modified in recent years.The performance comparison between D,yn11and Y,yn0 under the operating condition of no load,unbalanced load,single-phase short are made.The D,yn11 is better than Y,yn0.  
          
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      • Ren Yuanzhi
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.011
        摘要：The condition when forces are applied to load mechnical mornent limiter of tow-er cranes is analysed and disctissed in this paper.A lifting performance curve adapted for the me-chanical load moment limiter is also obtained.And finally,the curve drawing method is explainedthrough the practical example.  
          
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      • Xiao Weipin
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.013
        摘要：This paper presents some problems that is important part of the desision supportsystem on science-technic progress management at the construction enterprise and discusses targetsystems and evaluation models of synthesis effects on science-technic grogress at the sonstruction en-terprise,and some problem are illustrated and analysed further.  
          
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      • A STRUCTURAL NON-LINEAR DYNAMIC STABILITY AND A MATRIX FUNCTION METNOD

        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.014
        摘要：This paper presents a mathematical and mechanic model for non-linear dynamicstability analysis of structures on the basis of Liapunov's stability criteria. Due to the complexityand difficulty in numerical calculation,a matrix function to this type of stability problems is selectedand the programing formulations are derived.Applying the method to beam or frame structures un-der the axial period loadings,the geometric non-linear dynamic stability results are obtained.Fromthe results,the basic characteristics of this type of probtems,especially the non-linear effect areshown.The model and matrix function method are valtiable both in theory and in practice for struc-tural non-linear dynamic stability.  
          
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      • STUDY ON TNE FILTERING TNCHNIQUE OF THE UNIFORM MIXED-GRANULAR MATERIALS

        Cheng Minquan, Yang Jianhua
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.015
          
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      • THE PRACTICAL METHOD FOR STRUCTURAL FUZZY RELIABILITY ANALYSIS

        Gong Jinxin
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.016
        摘要：Structural fuzzy reliability an alysis is to calculate the reliability of structureconsidering random and fuzzy of structural variables simultaneously.The method used needs multi-dimensional integration,the qtiantity of calculating is too large when there are more random vari-bles,so that not easy to use in practice. This paper presents the firstorder second -moment method andfour-moment method for structural fuzzy reliability analysis and provides favourable factors for ap-plication of fuzzy reliability methed.  
          
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      • COOLING LUBRICATION FOR FRICTIONCLUTCH

        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.017
        摘要：This paper introduces the principle of a cooling lubrieator with simple structureand low price for the frictionclutch.The lubricator is practical and efficient obviously.Based on theexperiment,a synthetical effect of cooling lubrieation with the oil-rain as its rnain part is presented,and the principle of oil-rain cooling lubrication is also studied in this paper.  
          
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      • STUDY ON THE HARDENING AGENT OF LIME-SAND CONCRETE

        Peng Xiaoqin, Wu Lixian, Yang Junfeng, Bai Guang
        Vol. 16, Issue 1, (1994) DOI: 10.11835/j.issn.1674-4764.1994.01.018
        摘要：his paper introduces M and KM agents used in cement concrete successfully asearly strength agents.They are used in lime-sand concrete in the laboratory.Through the experi-ments,it is verified that both agents can increase the strength of lime-sand concrete on weaker auto-claving conditions and KMagent is better than M agent.Under the condition of this experiment,theoptimum proportion of the agents in lime-sand concrete and the optimum autoclaving schedules areexplored and the effects of saving energy of the two kinds of agents are estimated.  
          
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