聚-4-甲基-1-戊烯中空纤维膜式人工肺组件的氧气传质性能的研究

采用自制的聚-4-甲基-1-戊烯中空纤维膜组装成中空纤维膜式人工肺组件,以去离子水、生理盐水、甘油水溶液和Na2SO3水溶液来模拟血液,按照中空纤维膜内通氧气、中空纤维膜外走模拟液的方式进行体外性能测试,测定膜式人工肺组件在不同的液体流速、气体压力、中空纤维膜根数和模拟液种类下的氧气传输速率.实验表明:随着液体流速的加快、气体压力的变大和中空纤维膜根数的增多,膜式人工肺组件在四种模拟液下的氧气传质性能均对应不同幅度的强化.同时,依据质量守恒定律和双膜理论建立了一种膜式人工肺组件的氧气传质数学模型,为中空纤维膜传质性能研究和人工肺组件的结构优化提供了有益的参考.     

聚丙烯中空纤维人工肺

人工肺是进行心脏直视手术和呼吸衰竭抢救中体外循环所必需的医疗器具,用以短期代替人肺功能. 我校材料科学研究所和上海市第一结核病防治院、上海第二医学院生物医学工程研究室合作研究成功的聚丙烯中空纤维膜式人工肺,被誉为国际上最新一代的人工肺.它是由一万根外径为250μm、壁厚为40μm的聚丙烯中空纤维丝组成.丝壁上有大量相互贯穿的栅状微孔,这种微孔不能透过水,但对气体有极高的透过率.使用时,血液在中     

中空纤维膜吸收过程多釜串联传质模型

建立了一个可用于描述中空纤维壳程非理想流动的全混釜多级（多釜）串联传质模型，研究了中空纤维膜吸收器壳程非理想流动对其传质性能的影响，并对中空纤维膜吸收器的总传质系数进行了估算．模型预测与实验结果的比较表明，多釜串联传质模型可以较为准确地预测中空纤维膜吸收器的传质性能，有助于中空纤维膜吸收器的设计与优化．     

中空纤维膜接触器脱除水中溶解氧的研究

采用自制的聚丙烯中空纤维膜接触器脱除水中溶解氧,分别考察了水在中空纤维膜接触器的管程和壳程流动时,真空度、温度、进水流速以及中空纤维膜的有效长度对溶解氧脱除率的影响。实验结果表明：溶解氧脱除率随着系统真空度的增大而显著提高,在真空度为0．09MPa时,溶解氧脱除率可以达到80%以上;溶解氧脱除率随着流速的增加而增大,当流速达到一定数值之后,溶解氧脱除率保持不变;此外,溶解氧脱除率与中空纤维膜的有效长度密切相关．膜的有效长度越长．溶解氧脱除率越高,但其受进水温度并不明显。     

中空纤维三液相微萃取-高效液相色谱法测定水样中吡虫啉

将聚偏氟乙烯（PVDF）中空纤维三液相微萃取与高效液相色谱法联用,建立了分离富集测定水样中吡虫啉的新方法．对聚偏氟乙烯中空纤维的种类、萃取剂、萃取时间等实验参数进行了优化,确立了以磷酸二氢钾溶液为接受相、聚偏氟乙烯中空纤维和正辛醇为介质的三液相微萃取,最佳条件下富集20mL样品溶液,用高效液相色谱法测定,吡虫啉的检测限为0．4ng·mL^-1,吡虫啉的富集倍数为22．75倍．该方法可用于水样中痕量吡虫啉的测定．     

利用聚丙烯（PP）中空纤维膜去除水中溶解氧的试验

提出并研究了一个利用疏水性中空纤维膜去除水中溶解氧的新工艺 ,测定了所采用的聚丙烯 (PP)中空纤维膜的耐压性能。对促进除氧的机理进行了研究     

利用聚丙烯(PP)中空纤维膜去除水中溶解氧的试验

提出并研究了一个利用疏水性中空纤维膜去除水中溶解氧的新工艺,测定了所采用的聚丙烯(PP)中空纤维膜的耐压性能.对促进除氧的机理进行了研究     

高吸水仿麻织物的纱线设计

从麻织物风格及其吸水性能的要求出发，探讨利用涤纶中空纤维设计纱线号数、混纺比，捻度的方法、提出当设计纱号为32s、混纺比80／20，设计捻度100．763捻/10cm时纺制的纱线可较好地体现中空涤纶纤维吸水性能好的特点。     

湍流入料对中空纤维膜组件分离性能影响试验研究

研究了湍流入料对线型中空纤维膜和编织型中空纤维膜的强化分离作用,比较了湍流入料与直流入料对线型中空纤维膜性能影响的差别,进行了迪恩涡强化编织型中空纤维膜与湍流入料强化线型中空纤维膜渗透性能的研究.试验结果显示,湍流入料能显著提高线型中空纤维膜渗透性能,减少浓差极化和膜污染,回收率增大2倍,能耗低20%以上;湍流入料可增大编织型中空纤维膜渗透流量10%左右,能耗降低5%左右,膜组件长度越短,效果越明显迪恩涡强化编织型中空纤维膜分离性能优于湍流入料强化线型中空纤维膜分离性能,能耗低20%以上,渗透回收率高1～1.5倍.图6,参8.     

纳米介孔二氧化硅中空纤维的合成

以十六烷基氯化吡啶(C16PyCl)为模板剂,原硅酸四乙酯(TEOS)为硅源,甲酰胺为共溶剂,在酸性条件下合成了纳米介孔二氧化硅中空纤维,并使用扫描电镜(SEM)、小角X 射线衍射(SXRD)和N2气体吸附仪对其进行了表征。结果表明合成样品呈中空纤维形态,中空管内径约0．5-1μm,管壁厚度0．5μm左右,纤维长度可达50μm。中空纤维具有 MCM-41的有序六方孔道结构;煅烧后的样品显示典型的Ⅳ型吸附等温线和H1型滞后环,孔径分布很窄,BJH最可几孔径为2．72 nm,BET表面积1 212 m2·g-1。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has