微型汽车发动机排气系统优化设计——基于流体数值模拟的应用研究

为了研究排气系统设计对整机的动力性、经济性及排放性能的影响,通过一维三维的数值模拟方法,分析了原排气歧管存在的排气干涉的问题,对新旧设计进行了一维模拟计算对比。利用CFD/FEM耦合方法,计算了在最大功率点排气歧管的温度分布及热应力分布。通过三维CFD计算,分析了氧传感器位置气流分布及催化转化器前端气流均匀性。制造排气系统实物并进行台架试验,结果表明整机性能有了显著的提高,并且耐久性与排放符合设计要求。     

采煤机搬运车整车静态分析

对采煤机搬运车进行了三维建模;将动态仿真所得到的载荷加载在采煤机搬运车上,应用Unigraphics进行整车静态分析,得出分析结果。     

批判性建筑——在文化和形式之间

作为批判性话题中的经典之作,海斯在文章中系统地回顾了长期以来在建筑学中存在的两种基本态度：其一是将建筑看作是主导文化的一个部门和意识形态的再现,也就是“建筑作为文化手段”;其二是“建筑作为自治形式”．将建筑看作无关任何外部文本和前在状况的先验形式逻辑之再现。通过对密斯的若干经典建筑的再解读,海斯描述了在文化和形式之间存在的批判性领域。他进而提出了批判性建筑的观念,将建筑放置到它自身的世间性状况中去,以开放的批判的态度来面对不确定的经验状况。通过对如上两种对立态度及其二分法的抵抗和对抗．海斯认为,可以依靠建筑师的著述过程建立起批判的建筑知识体系和实践策略。     

McLean's Nuggets

The development of a clean, plentiful and low-cost alternative energy source is the holy grail of the 21st century. Ken Yeang looks into his crystal ball and asks whether the future could lie in nanoenergy and the proliferation of numerous personal nanogenerators - attached to buildings, individuals or under bridges. Copyright © 2009 John Wiley & Sons, Ltd.     

无学习率权值调整神经计算法拟合范德堡多项式

提出了一种新的神经计算的方法,其最大的特点是在进行特定的权值调整时无须加入学习率.计算开始时先给出一组随机的权值作为被拟合多项式的系数,由这组权值得到的拟合点上被拟合多项式值与期望值的各误差绝对值之和.依据其小分数的负值直接来调整权值,使各误差之绝对值不断减小,通过反复迭代计算,最终当各误差都在规定范围内时便得到期望的权值.在实际的计算中利用这种方法进行曲线拟合能方便地求出拟合多项式的系数,便于编程,简化了计算过程.将这种方法应用到范德堡函数的多项式拟合中,得到了范德堡函数f=1 0.03237714η-0.04037678η2 0.00857881η3-0.00077693η4 0.00002604η5并画出了曲线.     

从密斯的巴塞罗那馆看个案作品的建构分析与西建史教学的关系

密斯的巴塞罗那馆是现代建筑史中一个经典作品,同时又是一个在建筑形式和结构形式上充满矛盾的作品。本文以巴塞罗那馆为例．说明西建史教学中经典个案作品建构分析的重要性。     

Spaces of Freedom

The predicaments of the current global climate bring a new poignancy and focus to architecture. Emiliano Gandolfi , the curator of the much lauded ‘Experimental Architecture’ exhibition in the Padiglione Italia at the 2008 Venice Biennale, outlines how an emerging group of designers are redefining architecture as they seek to provide solutions that identify people's needs and address the exigencies of global warning, the environmental crisis and migration. Copyright © 2009 John Wiley & Sons, Ltd.     

Domestic Micro-Environments

In the following works, Mathieu Lehanneur readdresses our understanding of domestic spaces through the environmental systems that control and condition them. Such spaces are generally conditioned by centralised heating, cooling and ventilation systems that lump together many sensory qualities, including primary thermal controls as well as by-products of scent and sound, into a singular, mechanical system that fails to engage any of them fully. Lehanneur's projects look to separate these senses into systems distributed throughout the home, engaging each one specifically and locally, in an attempt to redefine the domestic spaces they are located within. Copyright © 2009 John Wiley & Sons, Ltd.     

Condensation: Regionalism and the Room in John Yeon's Watzek House

Mary Anne Beecher's discussion of Aubrey Watzek's house extends traditional notions of regionalism to the domain of the interior. She outlines numerous ways that the local landscape and history figure as condensed renditions within rooms, surfaces and details. It is here that we find evidence of interior atmosphere developed as identity within a specific cultural and geographical context. Copyright © 2008 John Wiley & Sons, Ltd.     

Correlating and Predicting the Solubilities of Solid n-Alkanes in Supercritical Ethane Using Carnahan-Starling-van der Waals Model

The solubilities of some solid n-alkanes in supercritical ethane were correlated and predicted in this paper using the Carnahan-Starling-van der Waals model with a density-dependent parameter of a12. At a given temperature, the linear fit of the parameter of a12 and the density of the supercritical solvent was used for solubility correlation, resulting in an average absolute average relative deviation（AARD） of 8.68%, which was between the values of the semiempirical models and the other compressed gas models used in this article. In the linear fit of the parameter of a12 and the density of the solvent, the regressed slope m and intercept n of the linear fit can be correlated with the carbon atom number of solid n-alkanes and then the solubilities of solid n-alkanes in supercritical ethane can be predicted with the intercept n and slope m. The average AARD in solubility prediction was 26.99%.