柱加大截面加固与碳纤维加固框架节点的试验研究与比较

进行了柱加大截面加固框架节点及碳纤维加固框架节点的试验,并对两者在承载力、刚度、延性及耗能能力等方面进行了比较。两种加固方法都改变了节点核芯区脆性破坏的性质,节点核芯区的极限强度、延性、刚度及耗能能力都得以提高。柱加大截面法加固还提高了原节点核芯区的开裂荷载。     

基于OpenSees的RC平面框架抗倒塌试验模拟与分析(之一)

基于OpenSees分析平台,以位移控制方法加载,对湖南大学平面框架抗倒塌试验进行非线性静力抗倒塌数值模拟,验证了OpenSees几何非线性分析方法及约束处理方法的有效性。给出梁柱构件的轴力图,分析梁、柱截面弯矩-曲率、P-M相关曲线,确定了基于变形的屈服准则,通过对模拟结果的后处理得出了平面框架的塑性铰分布及发展情况;提取梁柱单元内力,根据轴力及弯矩包络曲线考察梁柱内力变化规律。通过数值分析,深入探讨了框架结构的抗倒塌机制和抗力分布情况。     

关于新型材料在建筑上的应用探析

随着科学技术的发展,构成建筑的基本物质要素--建筑材料也在发展变化。新型建筑材料是在传统建筑材料基础上产生的新一代建筑材料。现代新型建筑材料首先要具有时代性才能符合现代建筑的要求;其次要节能环保,符合生态化特点才能有利于社会的发展。本文主要探讨了新型墙体建筑材料的使用对减轻建筑物自重提高建筑经济性等方面的重要作用。     

Effect of rare earth addition on Cu-Fe/AC adsorbents for phosphine adsorption from yellow phosphorous tail gas

Phosphine(PH3) is a highly toxic air pollutant,commonly produced in phosphorous chemical industry.But it has received less research attention due to its handling difficultly.CO is the main content of the phosphorous chemical industry tail gas,the concentration of which is always more than 80 vol.%,and it can be the feed gas to produce various valuable products such as formate,oxalate,and methanol and so on.But,PH3 is one of the important barriers,which is harmful to the following chemical process.In order to make use of the tail gas,PH3 should be removed firstly,and CO should be covered in the whole purified procedure at the same time.In this work,the modified activated carbon(MAC) was used as the adsorbent to separate PH3 from the mixture tail gas.Series of MAC adsorbents were prepared for the adsorption of PH3,which loaded Cu-Fe and Ce(La),or separately.The PH3 adsorption capacities,chemical and physical properties of MAC were all investigated.The results showed that over 99% PH3 adsorption efficiency was achieved when used MAC adsorbents.The removal efficiency and PH3 adsorption capacity of the Cu-Fe-Ce/AC(20:1:0.4) were both much higher than those modified activated carbons.The maximum PH3 adsorption capacity was 71 mg of PH3/g of MAC on the Cu-Fe-Ce/AC,which were much higher than literature data using CuO only for adsorbing hydride gases.     

高速线材自动控制系统

<正>马钢(合肥)钢铁有限责任公司高速线材生产线于2007年5月改造完成并投产。整条生产线(PF线部分除外)自动控制系统由马钢自动化工程公司负责设计,控制系统使用的是西门子S7系列PLC(Programmable LogicController,可编程逻辑控制器),传动系统使用的是西门子6SE70系列交流变频传动装置。轧制线由加热炉出炉辊道、8架粗轧机、粗轧机后1#飞剪、4架中轧机、     

冷轧酸轧机组板型仪系统功能的深化

本文重点叙述了冷轧酸轧生产线板型仪控制系统的组成、作用以及板型仪工作原理,并对各组成部件作用进行了详细介绍,简要介绍了酸轧线轧机机组的板型控制原理。同时,针对板型仪板型现有功能和特性,以及后期对板型仪功能扩展的展望,提出了对板型仪系统的功能扩展深化改进方案,实现轧制工艺参数的在线显示和实际板形的在线二维显示,轧制工艺参数和实际板形的历史回放,实测板形的三维列表选择显示,钢卷分类数据显示,钢卷EXCEL数据显示,POC和HMI区别显示,控制参数远程控制以达到发挥板型仪的最大作用,提高产品质量和产品的成材率。     

薄壁药盒成形工艺与模具设计

分析了薄壁药盒的成形工艺,对其中的关键工序,采用双拉伸一次拉伸成形。对斜楔及内外滑块同时压出18个凹面体的模具结构和模具主要零件的设计作了介绍。     

Characterization of Metal Oxide-modified Walnut-shell Activated Carbon and Its Application for Phosphine Adsorption: Equilibrium,Regeneration, and Mechanism Studies

We prepared a kind of metal oxide-modified walnut-shell activated carbon(MWAC) by KOH chemical activation method and used for PH_3 adsorption removal. Meanwhile, the PH_3 adsorption equilibrium was investigated experimentally and fitted by the Toth equation, and the isosteric heat of PH_3 adsorption was calculated by the Clausius-Clapeyron Equation. The exhausted MWAC was regenerated by water washing and air drying. Moreover, the properties of five different samples were characterized by N_2 adsorption isotherm, SEM/EDS, XPS, and FTIR. The results showed that the maximum PH_3 equilibrium adsorption capacity was 595.56 mg/g. The MWAC had an energetically heterogeneous surface due to values of isosteric heat of adsorption ranging from 43 to 90 kJ/mol. The regeneration method provided an effective way for both adsorption species recycling and exhausted carbon regeneration. The high removal efficiency and big equilibrium adsorption capacity for PH_3 adsorption on the MWAC were related to its large surface area and high oxidation activity in PH_3 adsorption-oxidation to H_3 PO_4 and P_2 O_5. Furthermore, a possible PH_3 adsorption mechanism was proposed.     

重组鲑鱼降钙素与降钙素基因相关肽融合基因分子设计及大肠杆菌表达载体构建

[目的]:为了获得一种能同时对高血压和骨质疏松两种疾病有治疗作用的融合蛋白。[方法]:根据大肠杆菌偏爱密码子原则,采用基因工程的方法设计并合成了重组降钙素基因相关肽与鲑鱼降钙素融合基因,并将该基因克隆到pGEX-6P-1表达载体上,将重组质粒转化到BL21中表达。[结果]:通过DNA测序验证目的基因被正确克隆到pGEX-6P-1上。[结论]:大肠杆菌表达载体构建成功。      

近零能耗建筑性能化设计平台应用研究

近零能耗建筑采用以目标为导向的性能化设计方法,对传统设计方式带来挑战。性能化设计平台为实现近零能耗建筑设计提供了技术支撑。本文从设计流程、工具及接口、数据库三个方面研究性能化设计平台,并对其在实际项目案例中的应用进行了总结。