A simple extension of cubic equations of state(EOS)to polymer systems has been proposed.The So-ave-Redlich-Kwong(SRK)EOS was taken as a prototype to be used to describe the PVT behavior of polymer melts in a wide temp...A simple extension of cubic equations of state(EOS)to polymer systems has been proposed.The So-ave-Redlich-Kwong(SRK)EOS was taken as a prototype to be used to describe the PVT behavior of polymer melts in a wide temperature and pressure range.Combined with a modified Huron-Vidal gE-mixing rule it was applied for modeling vapor-liquid equilibria of polymer-solvent solutions and the solubility of supercritical gases in polymer melts.Satisfactory results are obtained.展开更多
The atmospheric vapor-liquid equilibrium system of diethyl oxalate-ethanol was reproduced through the visual basic (VB6.0) computer language by using the Wilson, NRTL and the UNIFAC equation. The results of the three ...The atmospheric vapor-liquid equilibrium system of diethyl oxalate-ethanol was reproduced through the visual basic (VB6.0) computer language by using the Wilson, NRTL and the UNIFAC equation. The results of the three methods are all that could be desired. The calculated results of three different models are in perfect agreement with experiment data. The calculated results of UNIFAC equation is the optimum in several models. So the results can be used for chemical engineering calculation.展开更多
The vapor-liquid equilibrium of Dimethyl Carbonate-Methanol-Furfural under atmospheric pressure from DMC-CH 3OH,DMCC 5H 4O 2,CH 3OH-C 5H 4O 2 binary systematic VLE data is calculated,by using C ++(VC6.0) pr...The vapor-liquid equilibrium of Dimethyl Carbonate-Methanol-Furfural under atmospheric pressure from DMC-CH 3OH,DMCC 5H 4O 2,CH 3OH-C 5H 4O 2 binary systematic VLE data is calculated,by using C ++(VC6.0) programming language and Wilson equation.It provided important VLE data to set up mathematic models of extraction-rectifying separation of DMC and methanol by using furfural as extraction reagent.So the results can be used for chemical engineering calculation.展开更多
This research study measures the support for learners through the use of a Virtual Learning Environment project website. The website prepares, assists and supports the learners through their Mechanical Engineering Pro...This research study measures the support for learners through the use of a Virtual Learning Environment project website. The website prepares, assists and supports the learners through their Mechanical Engineering Projects in an accredited academic programme. The research question answered was "Is the VLE website helpful to learners in the final years of mechanical engineering projects?" The research focuses on the learners' experiences of using the project website and explores their views regarding the website. The literature relating to the study indicates that similar programmes have had positive results in relation to the adoption of VLEs to support learners.The data collection process involved an initial questionnaire about the website for the quantitative analysis. Thirty-nine project learners from the third and fourth years of the Mechanical Engineering programme participated in the questionnaires. The analysis of the questionnaire results indicated that the project website VLE was very helpful to learners completing their Mechanical Engineering projects. They all used the website for different aspects of the project but they still wanted a lecturer or lecturers to consult with for problems during the course of the project. The kinesthetic learning achieved in the project modules cannot be replicated or replaced by any virtual learning environment. The website afforded the learner to be better prepared for the project start in September. It gives the learner another resource to refer to when they were working at home, during the holidays or when they come to a particular part of the project. The website also teaches the learner to use the internet, videos, screencasts, tutorials, etc. to help them to complete the project.The website has enhanced student learning, motivation, earlier starts to project, peer learning and has improved the quality of projects.展开更多
用改进的Rose平衡釜测定恒压下(99.9 k Pa)甲缩醛-甲醇二元系的汽液平衡数据。用Herrington检验法对实测数据进行了热力学一致性检验。对Wilson和NRTL活度系数模型进行了关联,回归得到模型参数与温度之间的关系。与实验数据相比较,用Wil...用改进的Rose平衡釜测定恒压下(99.9 k Pa)甲缩醛-甲醇二元系的汽液平衡数据。用Herrington检验法对实测数据进行了热力学一致性检验。对Wilson和NRTL活度系数模型进行了关联,回归得到模型参数与温度之间的关系。与实验数据相比较,用Wilson模型预测的汽相组成其相对平均偏差为7.99%,温度平均偏差为0.12 K;NRTL模型的偏差分别为7.66%和0.22 K。结果表明用两种模型参数预测二元系的泡点与实验值能很好地吻合。展开更多
基金Supported by the Zhejiang Provincial Foundation for Returned Scholarsthe Scientific Research Foundation of the State Human Resource Ministry.
文摘A simple extension of cubic equations of state(EOS)to polymer systems has been proposed.The So-ave-Redlich-Kwong(SRK)EOS was taken as a prototype to be used to describe the PVT behavior of polymer melts in a wide temperature and pressure range.Combined with a modified Huron-Vidal gE-mixing rule it was applied for modeling vapor-liquid equilibria of polymer-solvent solutions and the solubility of supercritical gases in polymer melts.Satisfactory results are obtained.
文摘The atmospheric vapor-liquid equilibrium system of diethyl oxalate-ethanol was reproduced through the visual basic (VB6.0) computer language by using the Wilson, NRTL and the UNIFAC equation. The results of the three methods are all that could be desired. The calculated results of three different models are in perfect agreement with experiment data. The calculated results of UNIFAC equation is the optimum in several models. So the results can be used for chemical engineering calculation.
文摘The vapor-liquid equilibrium of Dimethyl Carbonate-Methanol-Furfural under atmospheric pressure from DMC-CH 3OH,DMCC 5H 4O 2,CH 3OH-C 5H 4O 2 binary systematic VLE data is calculated,by using C ++(VC6.0) programming language and Wilson equation.It provided important VLE data to set up mathematic models of extraction-rectifying separation of DMC and methanol by using furfural as extraction reagent.So the results can be used for chemical engineering calculation.
文摘This research study measures the support for learners through the use of a Virtual Learning Environment project website. The website prepares, assists and supports the learners through their Mechanical Engineering Projects in an accredited academic programme. The research question answered was "Is the VLE website helpful to learners in the final years of mechanical engineering projects?" The research focuses on the learners' experiences of using the project website and explores their views regarding the website. The literature relating to the study indicates that similar programmes have had positive results in relation to the adoption of VLEs to support learners.The data collection process involved an initial questionnaire about the website for the quantitative analysis. Thirty-nine project learners from the third and fourth years of the Mechanical Engineering programme participated in the questionnaires. The analysis of the questionnaire results indicated that the project website VLE was very helpful to learners completing their Mechanical Engineering projects. They all used the website for different aspects of the project but they still wanted a lecturer or lecturers to consult with for problems during the course of the project. The kinesthetic learning achieved in the project modules cannot be replicated or replaced by any virtual learning environment. The website afforded the learner to be better prepared for the project start in September. It gives the learner another resource to refer to when they were working at home, during the holidays or when they come to a particular part of the project. The website also teaches the learner to use the internet, videos, screencasts, tutorials, etc. to help them to complete the project.The website has enhanced student learning, motivation, earlier starts to project, peer learning and has improved the quality of projects.
文摘用改进的Rose平衡釜测定恒压下(99.9 k Pa)甲缩醛-甲醇二元系的汽液平衡数据。用Herrington检验法对实测数据进行了热力学一致性检验。对Wilson和NRTL活度系数模型进行了关联,回归得到模型参数与温度之间的关系。与实验数据相比较,用Wilson模型预测的汽相组成其相对平均偏差为7.99%,温度平均偏差为0.12 K;NRTL模型的偏差分别为7.66%和0.22 K。结果表明用两种模型参数预测二元系的泡点与实验值能很好地吻合。
