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CA/PAN中空纤维血浆分离膜的结构与性能 总被引:4,自引:2,他引:2
本研究以CA及PAN的共混溶液,通过干-湿法纺丝制取中空纤维,利用共混高聚物各组分在凝固剂中相分离速度的差异,形成具有稳定结构的中空纤维孔膜,该膜用于分离血液中的血浆成分具有良好效果。讨论了成型条件及添加剂等对膜结构、性能的影响,用SEM及图相分析仪、MAP压汞仪及DSC等分析手段,对膜的微孔结构、形态、孔尺寸及中空纤维膜的血浆通量和水通量等进行了系统的考查。 相似文献
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CO2/CH4醋酸纤维素分离膜的制备 总被引:3,自引:0,他引:3
以湿相转化法制备CO2/C4醋酸纤维互分离膜,无需热处理工序,研究了各种制膜条件,如蒸发时间、聚合物芨添加剂含量等,对膜气体分离性能的影响;用电镜观察了膜的形态结构,结果表明,适当提高聚合物浓度和延长蒸发时间可使膜表皮层变致密,获得高的CO2/CH4分离选择性和气体透过速率。 相似文献
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本文通过PMDA与二种不同二胺共处次制得了七种三元共聚聚酰亚胺膜,并对其透气性进行了初步探讨。 相似文献
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1、膜科学技术的发展现状和趋势膜科学技术是近三十年来随着合成纤维和有机聚合材料的发展而形成的一门新兴应用技术。早在1784年,法国学者Abbe’NDllet首次进行了有名的膀胱膜透过的人工试验,发现了渗透现象。1863年,Dubrunfaue制成了第一个膜渗析器,成功地进行了糖蜜与盐类的分离,开创了膜分离的历史纪元。本世纪40年代以后,离子交换膜的开发、利用和电渗析分离 相似文献
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制奋了聚二甲基硅氧烷和多孔聚丙的复合膜,并分别用以分离O_2、N_2和以渗透汽化法分离乙醇—水混合物。结果表明,当复合膜较薄时,膜的选择性对气体保持不变,而对渗透汽化法却大幅度下降。说明尽管气体膜分离与液体混合物的渗透汽化分离都遵循“溶解扩散”机理,但是溶解和扩散对选择性的贡献在两种情况下,程度是不同的。计算了氧、氮、乙醇和水的透过活化能,分别为6.7KJ/mol、10KJ/mol、32.6KJ/mol和35KJ/mol.建议气体分离膜在室温操作而渗透汽化膜在较高温度操作。 相似文献
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DOSO为载体液膜法提取Pd(Ⅱ)的传质模型 总被引:1,自引:1,他引:0
研究了以二正辛基亚砜(DOSO)为载体,乳状液膜法提取钯(Ⅱ)的渐进前沿模型。编写了计算程序,在IBM-PC微机上,用实验数据验证了该模型。结果表明实验值与计算值吻合较好。求出了在本实验条件下乳状液滴的平均半径R_(?),有效扩散系数D_(?)和外相边界层效应系数K的值。 相似文献
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This paper reports a research which was pursued with the purpose of indicating the need of amalgamating mass customisation and agile manufacturing principles for achieving competitiveness in organisations. The research findings and observations on these principles were used to design a model named as agile customisation programme. The implementation study of this programme was conducted in an electronics switches manufacturing company situated in India. The practical implications of this programme were studied by gathering feedback from the executives of this company. The details of these works are briefly presented in this paper. Further, the practical implications were used to propose a roadmap. Future researchers may adopt this roadmap and implement this programme in various types and sizes of companies. The performance of this programme in those companies shall be measured using agile manufacturing metrics such as responsiveness, time compression, quality improvement and profitability. 相似文献
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Professor Milosav Ognjanovic 《Research in Engineering Design》1996,8(3):178-187
The main objective of this paper is a practical and useful approach to problem solving in decision making, by an intelligent computer program. The existing theoretical considerations of this problem are not sufficient for practical application, due to the complexity of this subject, numerous related influences, insufficient data, etc. The aim of this paper is to present a structure for decision making in gear train transmission design, to determine the correlation between decisions in this process and to propose a method for their realization. 相似文献
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In order to assess the degree of radon awareness in the generalpublic in the provincial capital Lahore of Punjab province ofPakistan, a survey was conducted in all nine municipal townsof Lahore city. In this regard, volunteers from three Universitiesand six Colleges were deputed to collect data from hospitals,educational institutes, business points, markets, residentialareas, public offices and private sector organisations. About400 un-educated and educated persons of various educationalbackground from each municipal town participated in this surveyand their responses were recorded on the questionnaire preparedfor this purpose. In this way, a total of 3600 persons participatedin this survey. Results of this survey imply that on average,only 30.9% participants were scientifically aware of radon.These results suggest that a nationwide mass media campaignmay be launched by the Federal Ministry of Environment, ProvincialEnvironment Protection Agency and Community Development Departmentto educate the general public in this respect at the union councillevel about hazards of radon to avoid its harmful effects. 相似文献
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提出了一种可以稳定计算负跃层浅海环境中声场的波数积分方法,通过对艾里(Airy)函数的归一化,得到了声源位于水体不同层中的系数矩阵,该系数矩阵是无条件稳定的。结合仿真实例,将该方法的计算结果与Airy函数未作归一化得到的计算结果进行比较,结果显示,当Airy函数未作归一化时,在某些情况下不能保证深度格林函数的足够收敛性,而该方法可以很好地解决该问题。同时将该方法的计算结果与简正波模型KRAKENC的计算结果进行对比,结果表明,文中提出的数值计算模型可以作为负跃层浅海环境中声场计算的有效补充。 相似文献
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对液体软包装机计量泵单向阀引起的计量问题进行了分析 ,给出了解决方法 ,对该种机型使用的单向阀提出了设计原则和计算公式 ,根据这一原则设计了新的单向阀 ,经过在同样机型和同样条件下的实验 ,证明这种设计原则对该类型的阀具有一定的实用意义 相似文献
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