萃取精馏中萃取剂用量的图解计算方法

萃取精馏中用脱溶剂方法计算萃取剂用量十分繁杂,计算误差大。主要原因是:萃取剂的挥发度小,用数值小的数据关联数值较大的萃取剂用量,可能产生计算误差;在计算过程中脱溶剂的数据与不脱溶剂的数据混用;脱溶剂计算方法没有考虑液气比对分离效果的影响。建立了萃取精馏在三角相图中的几何意义,用浓度杠杆规则可以计算萃取剂的用量。计算结果合理,且符合精馏的各种规律。     

闽浙虹桥的调查研究(一)

研究新近在闽浙交界山区发现的木拱虹桥。普查实物,在实地勘测基础上,分析其建筑手法和结构技巧。与古今中外其它类型的大跨度建筑相比较,归纳其特点和优越性。探讨其在现代条件下的开发利用。继承并弘扬这一宝贵遗产。     

高要市广新农业生态园荔林广场膜结构工程设计与施工

介绍了广东省高要市广新农业生态园荔林广场膜结构工程的设计与施工情况 ,主要包括膜面的找形、荷载分析和裁剪。分析了结构的受力、荷载及施工中的特点 ,可供类似工程设计参考。     

大学城周边民居形态变化——以麓山南路一湖南大学段为例

在物质上城市是校园的承载者,城市的发展模式同时也是校园发展模式的启发者,大学与社区的模式中,以湖南大学为代表的融合模式,更能直接体现出校园与城市的密切相关。城市与大学水乳交融时也会得到大学带来的其他能量,本文主要是陈述麓山南路一湖南大学段,民居在建筑形态与商业形态上的一些变化,以及生活在城市一大学这个界面的人们的感受,来反映这种能量的作用。     

羊毛吸声绝热毡在集中空调风管系统中的应用

通过试验研究,分析了羊毛吸声绝热毡的吸声、绝热、防火和环保性能,结合实际工程案例对其在集中空调风管系统中的应用作了简单介绍.     

大型渗碳齿轮圈热处理畸变与控制

大型齿轮圈是焊接重载齿轮的外圆工作部分，其结构见图1。由于缺少内部支撑，该齿轮圈在渗碳淬火热处理过程中会出现明显的尺寸和形状变化，而渗碳层的加工余量很小，给机械加工造成困难。笔者就生产现场中出现的热处理畸变及预防措施作必要的分析。     

振动式旧砂再生机结构及其改进

介绍了振动式旧砂再生机的基本结构,以及旧砂再生过程的能量传递规律.讨论了现有的几种振动再生机的结构与性能特点,以及借鉴振动磨原理提高旧砂再生效果的方法,并介绍了离散元法(DEM)引入到旧砂再生研究中的可能.     

Manufacturing and measurement of freeform optics

Freeform optics is the next-generation of modern optics, bringing advantages of excellent optical performance and system integration. It finds wide applications in various fields, such as new energy, illumination, aerospace and biomedical engineering. The manufacturing of freeform optics is an integrated technology involving optical design, machining, moulding, measurement and characterization. This paper surveys the current application status and research on major technologies in details.     

3D FEM analysis of welding residual stress and deformation of aero-engine blisk

Aero-engine blisk welded by electron beam welding(EBW) method is a complicated structure. Fixtures were used to control the deformation of blisk during its manufacturing process. Finite element method was utilized to study the evolution of the welding residual stress and deformation of this structure. In which an attenuation function was applied to the double ellipsoid heat source model based on the characteristic of EBW, and the effects of fixtures on the welding residual stresses and deforamtion were also reserached. The simulation results showed that the temperature contour of weld cross section vertical to the weld centerline followed a “V” shape. Moreover, large welding residual stress and distortion were found in the interface between blisk and fixtures. The stress concentration was reduced sufficiently in starting and end part of weldment as the fixtures were removed after welding process, while the removing operation had almost no effects on the welding residual stress in the middle section of weld bead.     

共轭子结构解法

论述了机床结构在一般阻尼情况下的复模态分析中,采用共轭子结构解法来求解机床动态特性的模态参数表达式。共轭子结构解法以共轭复模态矩阵作为模态变换矩阵,整机相应分解为两个共轭子结构。利用振型叠加原理,求得整机的动态特性的模态参数表达式。共轭子结构解法简化了复杂的计算过程,也适用于其它复模态分析计算。