Abstract: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.

Abstract:研究了用Ｃｒ（Ⅵ）－二苯碳酰二胼体系测定尿液中微量铬的流动注射标准加入法，处理后的含铬试样作载流，Ｃｒ（Ⅵ）标准液从进样阀加入载流中。工作曲线和样品测定条件完全一致，消除了未知基体的干扰。分析结果的变异系数为１．７３％～３．６６％，加标回收率为９７．２％～１０６．０％．

Abstract:This paper uses the Poincare-Bendixson's annular region theorem with existenceof limit cycles of a cfass of nonlinear differential equation.

Abstract: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.

Abstract: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.

Abstract: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.

Abstract:报道了利用微生物对家畜粪便臭气的去除方法和效果。畜粪经过特殊的微生物菌剂在搅拌通气条件下发酵处理２～３天后，其粪中臭气味浓度比对照降低了８６％～９９％。

Abstract: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.

Abstract: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.

Abstract: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.

Abstract: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.

Abstract: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.

Abstract: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.

Abstract:提出了均匀粒径的陶粒和均匀粒径的无烟煤滤料，组成均粒混合滤料滤床，形成一种反粒度过滤，使整个滤床的截污作用都得到了充分发挥。

Abstract: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.

Abstract: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.

Abstract: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.