气体吸收过程中孔隙率影响的研究

通过非稳态气体吸收实验,在液相不流动的情况下,考察了孔隙率对传质性能的影响,实验表明在一定的孔隙率范围内,对于不同膜孔径和不同的吸收液,孔隙率的影响并不相同.为了清楚的解释这一现象,文中建立了微孔分子扩散的气体吸收传质模型,从理论上解释了孔隙率对传质性能有无影响和如何影响的问题.     

气液相际传质的理论研究

提出了气液相际传质的三膜模型．该模型认为,气液相际传质有三个阻力膜层：气膜、液膜和界面阻力膜．本文对模型中的参数进行了分析,并且进行了实验验证．结果表明,三膜模型能较好地反映两相间传质的规律．     

纤维液膜萃取分离器的流动、传质规律研究

在一直径为70 mm,高为2 630 mm的有机玻璃纤维液膜萃取分离器冷态实验装置上考察了操作参数及结构参数对其传质性能和流动特征的影响.通过考察体积传质系数,确定了纤维液膜萃取分离器的最佳填充密度和最佳流量比.建立了流动模型,提出了以无量纲准则数雷诺数为设计纤维液膜萃取分离器的准则.实验结果表明,其最佳填充密度为2.8%～3%,最佳操作流量比为5.     

纤维液膜萃取分离器的流动、传质规律研究

在一直径为70mm，高为2630mm的有机玻璃纤维液膜萃取分离器冷态实验装置上考察了操作参数及结构参数对其传质性能和流动特征的影响。通过考察体积传质系数，确定了纤维液膜萃取分离器的最佳填充密度和最佳流量比。建立了流动模型，提出了以无量纲准则数雷诺数为设计纤维液膜萃取分离器的准则。实验结果表明，其最佳填充密度为2．8％～3％，最佳操作流量比为5。     

泥磷液相烟气脱硝的传质动力学研究

基于泥磷烟气脱硝技术的实验研究,从双膜理论的气液传质动力学角度分析了泥磷烟气脱硝过程的气液传质动力学.根据泥磷吸收NO的特性,研究了在不同的反应温度(298.15～343.15 K)下,泥磷烟气脱硝过程中的气液传质系数、总传质系数等动力学参数随温度的变化情况,并计算了NO的气液传质阻力、增强因子.在动力学研究中,脱硝的...     

聚-4-甲基-1-戊烯中空纤维膜式人工肺膜组件的氧气和二氧化碳传质性能研究

采用自制的聚-4-甲基-1-戊烯中空纤维膜式人工肺组件,进行了氧气和二氧化碳传质性能研究.实验采用自制的模拟液循环装置,模拟液在膜丝外部流动,在氧气通入之前,用驱氧装置实现氧气的排出和二氧化碳的吸收,模拟静脉血,从而达到循环的效果.氧气在膜丝内部流动,经过膜组件部分溶解在膜丝外的模拟液中后,剩余氧气排出.模拟液选用去离子水、PBS缓冲溶液(78 v%PBS缓冲溶液,22 v%去离子水)、甘油-水溶液(50 wt%甘油,50 wt%去离子水)和亚硫酸钠水溶液(0.9 wt%亚硫酸钠,99.1 wt%去离子水).实验测定了在不同气-液流速、气相压力和气-液比下,氧气和二氧化碳的传质速率.实验测试表明,随着气-液流速增加,氧气和二氧化碳的传质效果明显增加,在去离子水中,在300mL·min^-1流速下,传质速率可达57.11 mL·min^-1·m^-2和103.59 mL·min^-1·m^-2.随着气相压力的增加,氧气传质效果增速先增后减,逐渐趋于平衡,而二氧化碳的传质效果有所下降.随着气...     

管排与V形丝网填料交替结构中液膜流动可视化实验

搭建了管排和填料交替结构中液膜流动的可视化实验装置,并对管排和V形不锈钢丝网填料交替结构以及无丝网的光管排中的溴化锂溶液流动进行了观察实验.通过对比溴化锂溶液在单列光管排和管排加丝网填料交替结构中的流动特征,分析了V形丝网填料对溶液流动的引流、布液和收集飞溅液体的有益作用.溴化锂溶液在交替结构中流动时,溶液在填料上依附于丝网表面向下流淌,并由丝网填料导流至下层管子上端.这种结构能够加强溶液混合,减小溶液的飞溅率和管子表面的干斑比例,有利于增加溶液与蒸汽接触的时间和传质面积,从而增强溶液吸收的驱动势,有利于吸收传热传质的强化.     

小颗粒滴流床中脉动流时分散气泡大小对传质的影响

在气液相並流向下流动的滴流床中,用CO_2-空气-NaOH系统在液相进行拟一级反应的化学吸收求取气液有效界面积和脉动流时分散气泡的平均直径,並讨论气液相流速,分散气泡大小与气液有效界面积之间的关系。实验表明:分散气泡的大量形成及直径变化是决定气液有效界面积的主要因素。要强化传质,除了增加气液流速外还可以减小颗粒度。     

水平管降膜换热器性能规律研究进展

水平管降膜换热器具有热质传递效率高、阻力小、结构简单等优点，被广泛应用于化工等传统领域及能源利用的节能减排领域。降膜换热器内部发生复杂的流动及传热传质相互耦合过程。介绍了实验及模拟研究手段的进展，综述了不同操作参数（气体温度、流向及流量，溶液流量、温度及浓度，内部媒介流量及温度等）与结构参数（管径、管间距等）对水平管降膜管间流型、液膜厚度与润湿性等流动特性的影响规律，以及对蒸发传热特性、吸收传热传质特性等换热器性能的影响规律，包括整体性能和局部微细特征，为水平管降膜换热器的性能优化提供理论支撑。指出在不同气流特征以及多因素相互作用下多维度的局部流动与传热传质性能的耦合影响规律以及强化换热手段会是水平管降膜换热器未来研究的重点方向。     

均质硅橡胶膜萃取含酚水溶液传质特性研究

构造了卷绕式及管束式两种膜组件,采用均质硅橡胶膜材料,以氢氧化钠溶液为萃取液,研究了含酚水溶液的膜萃取过程.基于液-膜-液的串联传质阻力模型,通过实验测定了体系的总传质系数.分析讨论了苯酚溶液浓度、流动状态和温度因素对膜萃取传质过程的影响,得出了总传质系数与料液流动状态及温度之间关系的数学模型.实验值与理论值的相对偏差在10%以内,表明所得的关联式可信、有效.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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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