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张厚斌 《土木建筑与环境工程》2000,22(3):109-112
应用前苏联声学专家A.H.卡切洛维奇的声线反射法则和有效混响时间理论对教堂中声场进行剖析,找出影响音擀的重要因素。通过少量吸声材料的有效布置解决语言和音乐混响之间的矛盾。 相似文献
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莫斯科马雅科夫斯基博物馆,俄罗斯MayakovskiMuseum,Moscow,Russia设计[俄]A波科夫(ABokov)E阿玛斯标拉(EAmaspyur)E.布金(EBudin)马雅科夫斯基是前苏联早期著名的诗人。他的诗是理想主义、现... 相似文献
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本文评析了艾伦·斯科特在继韦伯(M.Webber)的“工业区位论”和寥什(A Losch)的“城市区 位论”之后,把交易成本理论引入城市及区域规划理论后形成的“新工业区位论”(即CWS模式)及 其影响。 相似文献
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通过反应动力学参数的分析,可以得到DAT-IAT两个串联反应器的最佳设计方案。具有一定的理论和实用价值。可供同行参考。 相似文献
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三维块体不连续变形分析理论简析 总被引:9,自引:8,他引:9
王如路;陈乃明;刘宝琛 《岩石力学与工程学报》1996,3(3):219-219
详细论述了三维不连续变形分析理论建立的全过程,并就DDA实施过程的几个关键问题进行讨论,给出相应的公式。 相似文献
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都市理论和中国的城市化 总被引:1,自引:0,他引:1
这期《国外城市规划》的文集中收录的文章.展现了我对于都市理论探索的一个总体面貌,时间跨越了30年.从1972年首次发表的法语版《城市问题》到1996至2004年间关于流动空间和地方空间的理论著作。很显然.它们并不是一成不变的.理论在数十年间发生了变化。实际上.在早期理论中的一些基本要素与后期概念的发展是相互抵触的。或许这正是它应该呈现的样子.因为从根本上来说我是一名研究者,而不是哲学家,对我来说,理论的建构是用来理解、修正社会和空间过程的工具。在研究实践中.我对这些概念去伪存精.并发展了一些新的概念和新的理论解释来说明我所观察到的现象。 相似文献
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借鉴点集拓扑理论在空间拓扑关系中的应用,把这一理论拓展到了时态拓扑关系的分析中,给出了时态拓扑关系的定义、描述.最后设计出了查询变更地块的时态算法和实现方式实例. 相似文献
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套打树根桩的重力式挡土墙设计 总被引:3,自引:0,他引:3
针对水泥土重力式挡土墙中套打树根桩的加固形式,应用弹性地基梁理论和嵌岩桩计算理论,提出了套打树根桩的重力式挡土墙的设计理论及设计步骤,结合具体工程实例的计算,对比计算结果和工程实测,表明该设计方法是合理的. 相似文献
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A comparison is made between the results obtained using the Hoek and Brown model, the characteristics method and the Meyerhof hypothesis, Serrano and Olalla (Ultimate bearing capacity at the tip of a pile in rock; theory (Part I). Int. J. Rock Mech. Min. Sci., 2002) and actual data from pile tip load tests. A comparison is also made with some of the theories postulated and recommendations given in this respect. It has been shown that the results obtained by this theory are similar when dealing with soft rocks (σc<20–30 MPa), but that the ultimate bearing capacity of hard rocks is overestimated. Different series of graphs are proposed for the application. A spreadsheet is also proposed for possible immediate application use with the aid of a personal computer. A specific calculation example is given for the ultimate tip bearing capacity of a pile. 相似文献
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B.L. Balckford 《Journal of Wind Engineering & Industrial Aerodynamics》1985,20(1-3):267-281
A summary is given of our recent theory of optimal blade design for windmill thrusters. Compared to a conventional power windmill blade, the optimal thruster blade has a somewhat different shape and operates at a lower power rating. Several of these optimal blades have been built, and experimental results are presented from two different 4 m diameter windmill thrusters mounted on a 4 m catamaran hull. A comparison is given between the predicted and the measured net thrusts for windspeeds ranging from 3 m/sec to 8 m/sec. The corresponding boatspeeds were approximately one half of the windspeed. The agreement between theory and experiment was found to be about 10%. This is considered to be very good agreement, given the many complexities involved in the real system but simplified in the theory. The results indicate that the theory can be relied upon to predict the performance of properly designed windmill thrusters. 相似文献
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介绍了概率随机可靠度计算理论中改进的一次二阶矩法及可靠度反问题计算理论.以一软岩巷道稳定可靠度的问题为例,应用可靠度反问题分析方法作了参数的计算,并对结果进行分析,表明该方法对地下软岩工程中设计参数的控制具有指导作用. 相似文献
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A procedure for analyzing the mechanical behavior of laminated thin-walled composite box beam under torsional load without external restraint is presented. The method is based on the theory of composite laminated plates and is deduced by means of the free torsion theory of thin-walled beams, which makes the procedure simple and practical. In the present theory, the stresses are considered distributing unequally along the wall thickness and various coupling effects are taken into account. The calculation formulas of torsional angle and stress given by this method are concise and easy to use. The present analysis results indicate that by reason of coupling effects, in general, the free torsion of composite box beams may not exist definitely, so a concept of torsion without external restraint is suggested. Finally, the examples are given and their numerical results are analyzed and discussed. The values of torsional angle, ply stresses (including their variation with the off-axis ply angle) obtained by this paper are compared with those obtained by model test or finite element method (FEM). 相似文献
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端承型基桩的桩-土作用机理研究探讨 总被引:5,自引:1,他引:5
针对端承型单桩的桩-土作用机理,提出了复杂介质中端承型单桩的地基-基础模型,将“广义弹性理论法”、“镜像法”、传递函数法、线性变形层理论和优化反分析方法相结合,给出了一种分析计算复杂地基中端承型单桩承载性能计算的理论方法。并针对桩尖嵌岩深度的不同情况进行了探讨,给出了嵌岩桩的理论模型和计算分析方法。利用该方法所编制的优化反分析计算程序,不仅能根据地质资料计算端承型单桩的荷载-沉降关系,而且可根据现场静荷载试验所得的荷载-沉降曲线反演分析桩周及桩端土层的岩土力学参数值,所得数据能真实反映单桩工作性态,为工程设计和计算提供理论依据。将该程序应用到工程实例中,取得了较为令人满意的结果。 相似文献