成品库网架结构整体静动力及抗火性能化分析

介绍按结构设计规范要求的各种荷载作用情况下(包括8度区抗震竖向和水平方向),采用ANSYS对沿纵向支撑大跨平板网架屋面结构与下部结构共同工作的整体结构进行了静动力计算分析。针对不满足周边支撑条件的大跨平板网架的抗震分析提出了见解和建议。同时,对网架结构进行了结构抗火性能化分析,为屋面网架钢结构涂刷防火涂料抗火,取代喷淋设计提供了依据,取得较好的使用和经济效果。     

A real time approach to process control education with an open-ended simulation tool

Process simulators are widely used in industrial process designs and academic research. These simulation tools are also perfectly suitable for the process dynamics and control education of junior chemical engineers and students, as these tools mimetically help them with comprehending the basic theories of process control, such as process capacity, dead time, control loops, controllers and multi-unit processes such as distillation columns. At the University of Auckland, New Zealand, final year Chemical and Materials Engineering students who participate in the process dynamics and control paper are required to complete a series of simulation workshops in auxiliary sessions to help them in their understanding of process dynamics and control. This paper introduces the content of the workshops as well as reviews the student feedback on the introduction of the simulator and their perceptions of their learning of process dynamics and control as assisted by the software and instruction. Three case studies are provided in this paper to illustrate the benefits of running workshops. The motivation of this paper is to share our workshop design with other universities.     

Synthesis,photophysical properties and microphase separation of all‐conjugated diblock copolymers with hydrophilic side chains

A series of new all‐conjugated diblock copolymers, poly(2,5‐dioctyloxy‐p‐phenylene)‐block‐poly(3‐methoxyethoxyethoxy‐methylthiophene) (PPP‐b‐P3MEEMT), with hydrophilic side‐chains have been synthesized by quasi‐living Grignard metathesis polymerization. The narrow polydispersity indices of the block copolymers are in the range 1.32–1.40. The block ratios in the obtained diblock copolymers can be well defined by the feed ratios of the monomers. Photoluminescence results reveal that resonance energy transfer occurs from the PPP block to the P3MEEMT block in dilute solution. Differential scanning calorimetry shows that both PPP and P3MEEMT blocks in the copolymers produce crystalline regions and lead to microphase separation as indicated by two endothermal transitions, corresponding to the melting peaks of the PPP and P3MEEMT blocks, respectively. The formations of microphase‐separated nanostructures in annealed copolymer films are also observed using transmission electron microscopy. © 2012 Society of Chemical Industry     

Numerical simulation of gas flow through porous sandstone and its experimental validation

Due to post-lithogenetic fracturing or weathering, sandstone can contain complex dual porosity structure, which makes it difficult to identify the fluid flow behaviour through it. The main objective of this study is to develop a three dimensional numerical model to simulate the flow of gas through porous sandstone under triaxial test condition. For the purpose of the modelling study, laboratory data which have been obtained from triaxial experiments conducted on porous sandstone samples [1] were used. In this study, a commercial reservoir simulator, COMET 3 was used to model the gas flow in the test samples. The COMET 3 model closely predicts the gas flow through the porous sandstone sample for the range of confining and gas injection pressures studied in the laboratory and for low gas flow rates (laminar flow). However the model fails at high flow rates (turbulent flows), due to the fact that the COMET 3 simulator uses Darcy’s law for flow simulations. Therefore, caution is required when interpreting the model results if the assumption of laminar flow does not apply to the flow conditions. An empirical relationship has been developed in this study which can be used to obtain an estimation of the flowrate when the flow has become non-Darcian. It is however important to be able to identify the transition point from Darcy to non-Darcy flow when the assumption of Darcian flow in COMET 3 no longer applies. Experiments conducted by Yi et al. [1] show very clearly the transition points, which are dependent on the injection and confining pressures. The model developed using COMET 3 appeared to give better prediction of the gas flow rate in sandstone sample, under triaxial test condition, than the COMSOL Multiphysics model given in the study in Yi et al. [1].     

国内全钢载重成型机的现状和发展

总结了我国目前全钢载重子午胎成型机的发展现状,介绍了两鼓、三鼓、四鼓载重子午胎成型机的结构特点、工艺流程,机型特点等。最后简介了全钢载重子午胎成型机未来的发展方向。     

Analysis of Steady‐State Temperature Profiles from a Laboratory Reactor by Means of a Process Simulator

A process simulator was used for the analysis of steady‐state results from a laboratory‐scale tubular reactor for the oxidation of carbon monoxide over a platinum catalyst. From a set of 14 steady‐state experiments, temperature profiles were simulated with two adjustable parameters recovered by optimizing the fit: k°, the pre‐exponential portion of the rate constant, and h_out, the outer wall heat transfer coefficient for the reactor tube. Simulation showed that despite elaborate insulation the reactor did not behave adiabatically. Simulation also predicted fairly well the magnitude of phenomena such as ignition, extinction, and rate hysteresis (caused by changes in feed temperatures or concentrations) but at temperatures below the experimental values.     

用在线系统实时数据建立DTS培训教案的方法

提出了一种用于调度员培训仿真器ＤＴＳ取在线ＳＣＡＤＡ／ＥＭＳ实时数据进行培训的综合方法，它结合实时数据影射，开关逻辑规则测试以及注入量辅助分配和处理等几个部分软件的功能。有效地解决了用在线实时数据断面进行了ＤＴＳ培训所存在的问题。该方法在华东电网ＤＴＳ仿真器上已经实现，结果表明，该方法作了一种处理用在线实时数据进行ＤＴＳ培训的手段具有相当的应用潜力。     

正交试验法在低掺量碱渣全固废混凝土中的应用

采用正交试验方法对低碱渣全固废碱渣混凝土的配合比进行研究,考察了碱渣、脱硫石膏和钢渣三个因素的掺量对混凝土抗压强度和坍落度的影响情况。结果表明影响混凝土整体性能因素的大小为;钢渣脱硫石膏碱渣。通过对试验结果的均值、极差分析,从而得出碱渣因素对混凝土性能影响最大,确定各因素的比例关系为碱渣:脱硫石膏:钢渣=1:2:5。对净浆试块进行微观分析,发现胶凝体系中生成的钙矾石和C-S-H凝胶是贡献混凝土强度的主要因素。     

全SR农业轮胎胎面胶的研制

从既降低成本又能逃跑农业轮胎胎面胶的各项性能要求出发,同时根据ＳＲ的性能及工艺,设计配方进行优化,确定了Ｓ－ＳＢＲ／ＢＲ并用（并用比６０／４０＿,增大硫黄和软化增粘剂的用量,Ｎ２２０和Ｎ３３０并用（６３份）作为补强填充剂,三苯二胺为防老剂作为主要防老剂的胶料配方,同时适当调整了加工工艺。试验结果表明,该西方不仅满足了农业轮胎面面胶的性能要求,而且与现生产农业轮胎胎面胶相比,胶料成本降低３６３元．ｔ     

斜交轮胎双模定型硫化机用于子午线轮胎硫化的改造

通过对机械部件、水气管路、电气及热工控制系统等几个方面进行改造和调整,将原来用于斜交轮胎硫化生产的ＬＬＢ－１５２５型轮胎双模定型硫化机用于全钢子午线轮胎的硫化。改造后的硫化机基本可以满足全钢子午线轮胎硫化生产要求,而且大大节省了购置新子午线轮胎硫化机的费用。