最新刊期
卷 21 ， 期 3 ， 1999
- 摘要：Three Gorge reservoir will become a lake like water body which will be faced with the menace from entrophication pollution . Entrophication pollution will cause alga propagation in excess, so that fish and water plant will die largely and may cause the enteron cancer for people. The quiddity of entrophication is the pollution from plant nutriment (N and P etc.). The endure capacity of the water environment to plant nutriment and the development of interrelated technology for water pollution control are the key confining factors for the sustainable development of economy in Chongqing Area.663|9|0更新时间：2023-11-28
- 摘要：Based on experimental study of 2 reinforced concrete columns with consolidated reinforced cover under cyclic loading action,this paper describes the influence of initial stress state and construction measure at binding surface on loading capacity of the column and puts forward a few consturction measures to ensure integral operation of both old and new parts.413|11|0更新时间：2023-11-28
- 摘要：Various cost simulation software packages are extensively used in the construction industry today. There are some differences in the problems to which they are applied,but it is essential that users select suitable known distributions and estimate the parameter values for cost elements before starting any simulation. The accuracy and reliability of the simulation results depend on such selections. This paper proposes a practical and accurate selection method based upon the least differences of expected values and standard deviations between a known distribution and an estimated cost probability histogram.728|21|0更新时间：2023-11-28
- 摘要：This paper reviews some major opinions on the avoidance of real estate financial risks. The author puts forward a new idea on this object from the view points of externality and systematic risk.434|8|0更新时间：2023-11-28
- 摘要：This paper,taking the model KMX15R multi_way valve for an example,analyses some special function demands for multi_way valve raised by modern hydraulic excavator,the structure principle of new multi_way valve to accomplisch these fouctions.504|5|0更新时间：2023-11-28
- 摘要：This paper uses the one-dimensional resistance network theory for simulating calculation of the dynamic performance during heat storing and heat releasing of the cubic capsule ice thermal storage component. The calculation results have a good correlativity with the experimental values,which makes it clear that the model will be suitable for developing products and use in engineering.313|7|0更新时间：2023-11-28
- 摘要：The dynamic behaviour of a new reinforced concerte hollow plate using the medium strength(800 MPa yield strength)ribbed bar as prestressed wire has been studied experimentaly under various concentrated impact loads.The test results on the inherent characteristics,frequency,damping,dynamic rigidity etc.are presented.Meanwhile the important points in respect to the strength,deformation,cracking under impact loads and earthquake response of plate have discussed.355|563|0更新时间：2023-11-28
- 摘要：A coupled heat and moisture transfer model on reinforced concrete under high temperature was provided,then the heat and moisture transfer theory on reinforced concrete under fire disaster was analysed in this paper.The numerical simulation and field measurement data show that the model can roughly explain the actual heat and moisture transfer progress of reinforced concrete under fire disaster.388|679|0更新时间：2023-11-28
- 摘要：This paper describes the technological process in producing twisting thermal insulated pipe and compares it with the traditional method in China.In the paper,a technological economic analysis is made as well to compare the twisting thermal insulated direct-buried pipes with underground tunnel laying ones.495|463|0更新时间：2023-11-28
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- 摘要：This paper proposes a new way to reduce the drag of the fluid flow past a external fins pipe. If a little rectangular leaf is suitably installed upstream of the base pipe of the external fins pipe, not only the drag will be reduced, but also the heat transfer will be enhanced in a suitable range of Reynolds number. An experimental investigation showed that compared with a general external fins pipe, the new way can reduce the drag more than 40% and enhance the heat transfer about 10% meanwhile.485|424|0更新时间：2023-11-28
- 摘要：A reasonable selection of the method for evaluating the urban drainage system was discussed in this paper.Weighted average method and fuzzy synthetic evaluation were used to evaluate a modern urban drainage system,and a reasonable conclusion was obtained.363|359|0更新时间：2023-11-28
- 摘要：BADMP was synthesized with one step method from HCHO,HCL,PCL3 and C6H5CH2NH2,It is estimated that the purity of BADMP is suitable for corrosion-inhibition study by melting point measurement,element analysis and IR spectrogram, The properties of BADMP was also studied.513|593|0更新时间：2023-11-28
- 摘要：In this paper the high-performance concretes with 56-day compressive strengths of 60 to 100 MPa (with or without silica fume) have been studied experimentally in order to develop information about the mechanical properties of high-performance concrete. Results and discussions are presented regarding compressive strength gain with time,effect of drying. A linear equation of static modulus of elasticity has been derived.The static modulus of elasticity and Poisson's ratio are calculated by regression with testing data of 20 specimens.1174|627|0更新时间：2023-11-28
- 摘要：The quantity of alloys and the quality of weld layers are main factors influencing the chemical ingredient,microstructure and durability of hardfacing deposits,they also directly affect components' service life and alloys' utilization ratio.In this paper,these factors and control measures are analyzed.617|481|0更新时间：2023-11-28
- 摘要：This paper presents a method of tamping for improving unconsolidated sand and gravel foundation backfilled on the flood land,and introduces the principles of soil improvement with some engineering cases. Results from the field tests show that this method is reliable,economical and feasible.It provides reliable basis for applying this method on other similar engineering projects hereafter.575|15|0更新时间：2023-11-28
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- 摘要：The relationship between tangent derivative and generalized corvex of set_valued mapping is dealt with in this paper.Then these properties and concepts are applied to optimization problems.Generalized convex properties of perturbation mapping is proved under certain conditims.516|24|0更新时间：2023-11-28
- 摘要：Based on ASHRAE's BIN(temperature frequency) method,corresponding Chinese original climate data, the BIN were adjusted, the precision of bin data from standard year by Lagrange_interpolation, was tested the method for transform of regression BIN data to curve was discussed..561|16|0更新时间：2023-11-28
- 摘要：Since the implementation of the new construction system in 1988 in China, this system has gone through three phases: trial phase(1988-1993),development phase(1993-1995),and comprehensive application phase from 1996.Construction supervision as a new management system has profound effects to the whole process of a construction project, in particular, to the three conventional objectives, that is quality, cost and construction time. The new management system has to a large extent brought the traditional problems of extended construction time, uncontrollable cost and unsecured quality to a normal practice. Construction supervision is a management activity with request of high intelligence. The performance of this activity is closely related to the quality of project general supervision engineer. This paper identifies the basic elements that a proper project general supervision must have. By applying the fuzzy analysis principle, this paper presents a quantitative model for evaluating the quality of project general supervision engineer.It provides an applicable approach for project clients when general supervision engineers are to be chosen.502|6|0更新时间：2023-11-28
- 摘要：Based on neural network,this paper presents a method of damage assessment of frame structures,which provides a new approach for damage assessment of structures under dynamic conditions.The adaptability and efficiency of this method are discussed through computation simulation,The numerical results show that this method is promising.802|10|0更新时间：2023-11-28
- 摘要：The Earliness/Tardiness problem in job_shop is discussed in this paper.Based on the analysis of practical situations and lot transfer between stages,an integer programming mode is proposed,The solution is obtained by the application of Lagrangian relaxation technique.403|12|0更新时间：2023-11-28
- 摘要：Based on analysis of contest and content of time elements in network schedule,the author has set up a set of standard models for time elements'calculation,which will improve traditional manual calculation method,the accuracy will therefore be increased and time saved.502|8|0更新时间：2023-11-28
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