1998, 20(2):1-5. DOI: 10.11835/j.issn.1674-4764.1998.02.001
Abstract:Thrdugh construction cost analysis, the paper provides the monitoring forecast models and the Construction Cost Harmonizaton-Control models.
1998, 20(2):6-10. DOI: 10.11835/j.issn.1674-4764.1998.02.002
Abstract:在采样控制系统的数字仿真中,由于某种特殊要求,有时希望改变其采样周期。与此同时,数字控制器的脉冲传递函数D(Z)也应发生相应变化,以保证仿真模型与原系统模型等价。本文对D(Z)中含有共轭复数零点,或负实数零点时,如何确定数字控制器的相应脉冲传递函数D(Z)的问题进行了研究,提出了解决方法,通过实例对三种不同情形进行了对比分析。
1998, 20(2):11-15. DOI: 10.11835/j.issn.1674-4764.1998.02.003
Abstract:This paper discusses the strategies of sustainable city development and approaches of sustainable city planning and design. The definition and essentials of sustainable city are also explored, and it is pointed out that constructing sustainable city would be a historical tendency.
1998, 20(2):16-21. DOI: 10.11835/j.issn.1674-4764.1998.02.004
Abstract:This paper discusses the reasons of existing colour difference of coated glass.Its spectral reflectance was measured by using spectrophotometer. The effects of visual field,colour space and standard illuminant on the calculated value of colour difference of the glass are also analyzed. Furthermore,this paper provides a suitable method to determine the characteristic value of colour difference for coated glass sample.
1998, 20(2):22-25. DOI: 10.11835/j.issn.1674-4764.1998.02.005
Abstract:通过对我国城市面临的“特色危机”问题的剖析,指出城市特色风貌是城市历史,文化的积淀,忽视地域文化,历史文脉的延续是失落的内在根源,从而引出问题-城市特色风貌研究的紧迫性和重要性。
1998, 20(2):26-29. DOI: 10.11835/j.issn.1674-4764.1998.02.006
Abstract:The maximum intensity of direct solar radiation falling on a vertical surface and the relative solar altitude and azimuth angles under this condition are given, which can be used in urban planning to determine the relative location of buildings.
1998, 20(2):30-34. DOI: 10.11835/j.issn.1674-4764.1998.02.007
Abstract:A novel model of 3D 12_node infinite element is presented in this paper.The mapping functions in the novel model are clear_cut in the concept and concise in the form.The problems,which emerge in using the infinite element model of the reference, appear in using the novel model.A comparison between the novel model and the infinite element model of the reference is made by computing the examples.The results show that the novel model has the advantages in performance and accuracy.
1998, 20(2):35. DOI: 10.11835/j.issn.1674-4764.1998.02.008
Abstract:This paper presents a discussion on various boundary integral equations reduced from the exterior Neumann problem of Helmholtz equation.The author analyses how the famous difficulty that some equations have no unique solution when the wave number k is an eigenvalue of an interior problem is arised in the course of reducing these equations from Helmholtz representations,and proposes a method of overcoming the difficulty,that is,introducing a direct boundary integral equation which has unique solution for all wave numbers k and is equivalent to the original boundary value problem.Besides,advantages and shortcomings for these integral equations are estimated respectively.
1998, 20(2):41-46. DOI: 10.11835/j.issn.1674-4764.1998.02.009
Abstract:Based on the crack tip microcrack density theory,a supposition that total AE count is directly proportional to the total microcrack length is proposed,a relationship between total AE count and stress intensity factor for stable crack growth is derived.With a series of experimental results,the relationship between theoretical derivation and the experimental results is compared,it shows that the theoretical derivation coincides better with the experimental results.
1998, 20(2):47-51. DOI: 10.11835/j.issn.1674-4764.1998.02.010
Abstract:Parallel machining system is a kind of typical production environment.Its scheduling algorithm has Np_Completeness if E/T is optimal criterion.In this paper,an advanced heuristic algorithm is developed.The new algorithm's property lies in simplified computation,low complexity and easy programming.It has been shown that the heuristicalgorithm can be used in engineering.
1998, 20(2):52-59. DOI: 10.11835/j.issn.1674-4764.1998.02.011
Abstract:The accidents and hidden troubles in constructional engineering quality must be restrained and eliminated.Strictly controlling the quality of concrete is a key link of ensuring constructional engineering quality.To strengthen the quality evaluation of concrete is an effective measure to improve the quality of concrete.The author takes a living engineering example as an object of the study,considers the compresssive strength of concrete as a focal point,regards the standard engineering criteria as the code of conduct and adopts the mathematical statistics scientifically to assess the control level of construction quality,so as to improve the management level and to promote good quality of engineering.
1998, 20(2):60-64. DOI: 10.11835/j.issn.1674-4764.1998.02.012
Abstract:In this paper, the relation of cloudy sky luminance with particle scatter and air mass is discussed by using the results of atmospheric and geometrical optics. Based on the microcosmic mechanism, the existence of the maximum luminance element in cloudy sky is clarified and an interesting result is obtained.
1998, 20(2):65. DOI: 10.11835/j.issn.1674-4764.1998.02.013
Abstract:This paper introduces an experimental research on the compressive strength of the heated concrete tested on the small cores of 45 mm and 70 mm in diameter by compression and transverse cutting methods.By means of mathematical statistics, the test strength equations and regression curves obtained are quantitatively analyzed.
1998, 20(2):69-72. DOI: 10.11835/j.issn.1674-4764.1998.02.014
Abstract:First of all, this paper simplifies the basic equation, then the solution of the problem can be obtained by means of the method of weiqhted residue on the boundaries.
1998, 20(2):81-88. DOI: 10.11835/j.issn.1674-4764.1998.02.016
Abstract:In this paper,the developments and applications of Trenchless Technology for underground pipeline are presented,the principles of its technique families are described sequentially and the world_wide trend of this new technology is also outlined.Finally,based upon cultivating the China Market of Trenchless Technology Industry,this paper puts forward the tactics and direction of our country for the development,research,popularization and application of this new construction technology.
1998, 20(2):89-93. DOI: 10.11835/j.issn.1674-4764.1998.02.017
Abstract:A traditional method of experiment on demarcating thermocouple is analyzed and its shortcoming is indicated.It is proposed that the experimental device for demarcating thermocouple should be advanced through application of a microcomputer.The timing for data sampling is carried out in a real time clock way and then the analogue signal is converted into digital information through a A/D converter.Finally, the results of demarcating thermocouple are audio-visually displayed on the screen in a graphic mode.
1998, 20(2):94-99. DOI: 10.11835/j.issn.1674-4764.1998.02.018
Abstract:This paper discusses the size of foundation base in reinforced concrete single-foundation under column.The two kinds of direct-calculating formulas have been derived. They are simple and helpful.They can be easily used in foundation design.
1998, 20(2):100-101. DOI: 10.11835/j.issn.1674-4764.1998.02.019
Abstract:This paper describes some new ideas and new designs based on the fixing device of GB rolling bearing with fastening liner.Its character lies in only need of removing one bearing cap when it is needed to dismount the bearing from its axle without using dismantling device, but by using a special nut.Therefore it will be convenient, easy and time-saving.
1998, 20(2):102-108. DOI: 10.11835/j.issn.1674-4764.1998.02.020
Abstract:马尔科夫排队过程是马尔科夫决策规划的一个重要应用。本文研究将一般的排队系统转化为马尔科夫排队过程,因而可以利用马尔科夫决策规划的求值运算来求解。本文着重介绍了顾客逐一的接受服务和顾客成批的接受服务两种最主要类型并计算给出相应的结果。
1998, 20(2):109-115. DOI: 10.11835/j.issn.1674-4764.1998.02.021
Abstract:This paper deals with the investigation of the structural behaviour,mechanical conditions and the impacts of the related factors of slide_resistant system on cantilever pile_anchorage pile.This investigation is based on analysis of indoor model test and a great number of computer_simulated analyses.The side_resistant system was used for landslip_resistant project in Shijialiang of Chongqing,and provided good social and economic benefits.
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