大跨度单层工业厂房上部结构的设计

１工程概况 中国长城铝业公司新建炭素二焙车间焙烧工段厂房为单层单跨排架工业厂房，跨度３６ｍ，总长１９８ｍ，按伸缩缝区段划分为三个部分，屋面采用３６ｍ跨梯形钢屋架和１２ｍ跨钢天窗架，上铺６ｍ跨大型混凝土屋面板和天沟板，柱距６ｍ，柱子采用预制钢筋混凝土工字型柱，部分柱为现浇矩形截面柱，柱基采用钢筋混凝土灌注桩，厂房内设有两台新型多功能天车，每台自重１６８ｔ，其中小车自重５８．６ｔ，装满料后总重量达２０ｔ，工作级别为特重级，吊车梁采用钢吊车梁，其截面高度为１２４０ｍｍ。该天车自重大，使用频繁，是决定柱…     

关于梁端弯矩调幅问题的探讨

对框架结构梁端弯矩应如何调幅问题做一探讨，对以往设计提出修正性的建议。     

亲合毛细管电泳法测定八种氟喹诺酮药物的等电点

首次利用亲合毛细管电泳法精确测定了培氟沙星、氧氟沙星、左氧氟沙星、诺氟沙星、氟罗沙星、洛美沙星、环丙沙星和依诺沙星等8种氟喹诺酮药物的等电点,8种药物的等电点依次为6.55、6.70、6.70、6.70、6.45、6.70、6.70和6.70。     

填料塔技术的现状与发展趋势

填料塔是化工类企业中最常用的气、液传质设备之一 ,而塔填料、塔内件及工艺流程又是填料塔技术发展的关键。从塔填料、塔内件以及工艺流程 ,特别是塔填料三方面对填料塔技术的现状与发展趋势作了介绍 ,说明了塔填料及塔内件在填料塔技术中的重要性     

奥扎格雷中DMF残留量的测定

建立了直接进样毛细管气相色谱法测定奥扎格雷中DMF残留量的方法。色谱柱为HP-FFAP石英毛细管柱,采用程序升温,载气为氮气,检测器为FID,以DMSO为溶剂。在上述色谱条件下,DMF的线性范围为1.76~15.84 mg/L,平均加样回收率为95.14%。此方法可用于测定原料药中DMF的残留量。     

Dynamic Analysis of Structural Columns Subjected to Impulsive Loading

For a building structure subjected to impulsive loading, particularly shock and impact loading , the response of the critical columns is crucial to the behaviour of the entire system during and after the blast loading phase. Therefore, an appropriate evaluation of the column response and damage under short-duration impulsive loading is important in a comprehensive assessment of the performance of a building system. This paper reports a dynamic analysis approach for the response of RC columns subjected to impulsive loading. Considering that the dynamic response of a column in a frame structure can also be affected by the floor movement which relates to the global vibration of the frame system, a generic column-mass model is used, in which a concentrated mass is attached to the column top to simulate the effect of a global vibration. To take into account the high shear effect under impulsive load, the model is formulated using Timoshenko beam theory, and three main nonlinear mechanisms are considered. Two typical scenarios, one under a direct air blast loading, and another under a blast-induced ground excitation, are analyzed and the primary response features are highlighted.     

家用空调制冷剂充注量与毛细管长度的匹配

通过试验的方法研究了空调器制冷剂充注量与毛细管长度对制冷系统的影响,得出了相应的试验曲线,找出了最佳匹配结果.根据试验结果分析了毛细管长度与制冷剂充注量影响空调性能的基本规律.     

某商店底层抽柱的设计方案比较与计算

通过对某商店底层抽柱的设计方案比较分析，提出了采用新增钢筋混凝土框架托柱以抽除底层柱子的一种行之有效的设计方法，结合工程实例进行了设计计算，达到“确保安全、节省资金”的要求。     

CFD Analysis of Gas Distributor in Packed Column--Prediction of Gas Flow and Effect of Tower Internals Geometry Structure

Computational fluid dynamics (CFD) simulations were carried out on the gas flow patterns of twin-tangential annular deflector gas distributor in the absence of liquid flow in a packed column (6.4 m in diameter), and the gas flow field in the column was presented close to reality on the whole. Furthermore, after ame-lioration of this gas distributor frame, turbulence energy and turbulence energy dissipation rate were both decreased greatly.Simulation results showed that the flow pattern and the distribution of gas flow were strongly affected by the column bottom frame; the proper column bottom frame could decrease the flow pressure drop greatly. Multifold factors, such as the column bottom geometry structure and distributor structure which affects the distribution capacity, must be considered.     

Greville定理的推广

本文将计算加列矩阵的Moorc—Penrose广义逆的Greville定理推广到同时加若干个列的矩阵,最后给出一个数值计算的例子.