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SCI和EI收录∣中国化工学会会刊
本期目录
2004年 第12卷 第2期 刊出日期:2004-04-28
    TRANSPORT PHENOMENA & FLUID MECHANICS
    基于单气泡非稳膜机理的相际传质模型
    赵斌, 王铁峰, 王金福
    . 2004, 12(2):  163-168.  doi:
    摘要 ( )   PDF (2292KB) ( )  
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    A gas-liquid mass transfer model based on an unsteady state film mechanism applied to a
    single bubble is presented. The mathematical model was solved using Laplace transform to
    obtain an analytical solution of concentration profile in terms of the radial position r
    and time t. The dynamic mass transfer flux was deduced and the influence of the bubble size
    was also determined. A mathematical method for deducing the average mass transfer flux
    directly from the Laplace transformed concentration is presented. Its accuracy is verified
    by comparing the numerical results with those from the indirect method. The influences of
    the model parameters, namely, the bubble size R, liquid film thickness δ, and the surface
    renewal constant s on the average mass trannsfer flux were investigated. The proposed model
    is useful for a better understanding of the mass transfer mechanism and an optimum design
    of gas-liquid contact equipment.
    旋流板内两相流场的CFD模拟与分析
    邵雄飞, 吴忠标
    . 2004, 12(2):  169-173.  doi:
    摘要 ( )   PDF (1760KB) ( )  
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    The flow field of gas and liquid in a φ150mm rotating-stream-tray (RST) scrubber is
    simulated by using computational fluid dynamic (CFD) method. The simulation is based on the
    two-equation RNG κ-ε turbulence model, Eulerian multiphase model, mad a real-shape 3D
    model with a huge number of meshes. The simulation results include detailed information
    about velocity, pressure, volume fraction and so on. Some features of the flow field are
    obtained: liquid is atomized in a thin annular zone; a high velocity air zone prevents
    water drops at the bottom from flying towards the wall;the pressure varies sharply at the
    end of blades and so on. The results will be helpful for structure optimization and
    engineering design.
    SEPARATION SCIENCE & ENGINEERING
    氢氧化钠浸取-浸取渣熔融法从炼钢厂烟尘中提取锌的研究
    赵由才, R.Stanforth
    . 2004, 12(2):  174-178.  doi:
    摘要 ( )   PDF (1669KB) ( )  
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    Extractability of zinc from two types of electric arc furnace (EAF) dusts containing 24.8%
    and 16.8% of zinc respectively (denoted as Sample A and Sample B) were tested using direct
    alkaline leaching followed by fusion of the resulting leaching residues with caustic soda.
    The experimental results show that the extraction of zinc is heavily dependent on the
    contents of iron in the dusts. The higher iron content, the lower extraction of zinc is
    obtained. 53% and 38% of zinc can be extracted when both dusts were directly contacted with
    5mol·L^-1 NaOH solution for 42h. The remaining zinc left in the leaching residues, which
    supposed to be present as zinc ferrites, can be further leached when the residues were
    fused with caustic soda. Quantitative extraction of zinc can be obtained from the leaching
    residue of Sample A while only 85% from Sample B. The extractability of zinc from dusts wit
    hvarious contents of iron is compared. The production flowsheet for zinc from the dusts
    using the process proposed is discussed.
    薄膜蒸发器的分离效率
    R.Billet
    . 2004, 12(2):  179-184.  doi:
    摘要 ( )   PDF (1784KB) ( )  
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    The recovery of contaminants and useful substances from liquid wastes, the purification of
    production effluents and the separation of thermally instable mixtures are some of the
    multivarious applications of thin-film distillors in many processes of the chemical and
    allied industries and of the food industries. In a study carried out in pilot plants with
    distillation test systems there was found a good agreement between the experimental
    separation results and those obtained by computing with a theorectical model; the latter is
    based on the assumption of phase equilibrium between the vapour formed on an infinitely
    small element of area in a liquid film of any given concentric periphery of the vertically
    arranged evaporator. These tests were perfomed under various phase loads.
    随机填充中空纤维膜组件中非稳态渗透传质数学模型
    张秀莉, 张泽廷, 张卫东, 郝欣
    . 2004, 12(2):  185-190.  doi:
    摘要 ( )   PDF (1638KB) ( )  
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    Based on the membrane-based absorption experiment of CO2 into water, shell-side flow
    distribution and mass transfer in a randomly packed hollow fiber module have been analyzed
    using subchannel model and unsteady penetration mass transfer theory. The cross section of
    module is subdivided into many small cells which contains only one hollow-fiber. The cross
    sectional area distribution of these cells is presented by the normal probability density
    distribution function. It has been obtained that there was a most serious non-ideal flow in
    shell side at moderate mean packing density, and the large amount of fluid flowed and
    transferred mass through a small number of large voids. Thus mass transfer process is
    dominated by the fluid through the larger void area. The mass transfer process in each cell
    is described by the unsteady penetration theory. The overall mass transfer coefficient
    equals to the probability addition of the mean mass transfer coefficient in each cell. The
    comparisons of the values calculated by the model established with the empirical
    correlations and the experimental data of this work have been done.The predicted overall
    mass transfer coefficients are in good agreement with experimental data.
    REACTION KINETICS, CATALYSIS AND……
    非均相催化一步合成碳酸二苯酯的研究(VI)Sn 的添加量对Pd-Sn催化性能的影响
    张光旭, 吴元欣, 马沛生, 田崎峰, 吴广文, 李定或
    . 2004, 12(2):  191-195.  doi:
    摘要 ( )   PDF (1911KB) ( )  
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    The compound metal oxide LaxPbyMnzO used as support was prepared by the sol-gel method, and
    the catalyst in which Pd was used as active component and Snas co-active component for
    direct synthesis of diphenyl carbonate (DPC) with heterogeneous catalytic reaction was
    obtained by co-calcination and precipitation respectively.The catalyst was characterized by
    XRD, SEM and TEM respectively. The specific surface area of catalysts was measured by
    ChemBET3000 instrument, and the activity of the catalysts was tested by the synthesis of
    DPC in a pressured reactor. The results showed that when the co-active component Sn was
    added by co-calcination method A, its loading content was equal to 14.43% and active
    component Pd was loaded by precipitation, the yield and selectivity of DPC could reach
    26.78% and 99% respectively.
    机械力强化作用下轻烧氧化镁碳化过程的传质与反应动力学研究
    张焕军, 朱国才
    . 2004, 12(2):  196-201.  doi:
    摘要 ( )   PDF (1799KB) ( )  
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    The carbonization of magnesium oxide particles by CO2 was investigated using a stirring
    mill reactor.The effects of the system temperature, stirring rotation speed, influx rate of
    CO2 and initial diameter of the magnesium oxide particles on the carbonization process were
    determined. The results show that the system temperature and the stirring rotation speed
    are the most significant influencing factors on the carbonization rate. The determination
    of critical decomposition temperature (CDT) gives the maximum carbonization rate with other
    conditions fixed. A theoretical model involving mass transfer and reaction kinetics was
    presented for the carbonization process.The apparent activation energy was calculated to be
    32.8kJ·mo1^-1. The carbonization process is co-controlled by diffusive mass transfer and
    chemical reaction. The model fits well with the experimental results.
    低品位铌钽矿高浓碱性介质浸出过程动力学研究
    周宏明, 郑诗礼, 张懿
    . 2004, 12(2):  202-207.  doi:
    摘要 ( )   PDF (1698KB) ( )  
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    The leaching kinetics of niobium from a low-gr~te niobium-tantalum ore by concentrated KOH
    solution under atmospheric pressure has been studied. Significant effects of reaction
    temperature, KOH concentration,stirring speed, particle size and mass ratio of alkali-to-
    ore on the dissolution rate of niobiumwere examined. The experimental data of the leaching
    rates and the observed effects of the relevant operating variables were well interpreted
    with a shrinking core model under diffusion control. By using the Arrhenius expression, the
    apparent activation energy for the dissolution of niobium was evaluated. Finally, on the
    base of the shrinking core model, the rate equation was established.
    甲基丙烯酸-N, N-2-甲基乙胺酯原子转移自由基聚合动力学研究
    江成发, 张允湘
    . 2004, 12(2):  208-213.  doi:
    摘要 ( )   PDF (1832KB) ( )  
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    A kinetic model was developed to describe the atom transfer radical polymerization (ATRP)
    of 2-(N,N-dimethylamino) ethyl methacrylate (DMAEMA). The model was based on a
    polymerization mechanism,which included the atom transfer equilibrium for primary radical,
    the propagation of growing polymer radical, and the atom transfer equilibrium for the
    growing polymer radical. An experiment was carried out to measure the conversion of
    monomer, the number-average molecular weight of polymer and molecular weight distribution
    for the ATRP process of DMAEMA. The experimental data were used to correlate the kinetic
    model and rate constants were obtained. The rate constants of activation and deactivation
    in the atom transfer equilibrium for primary radical are 1.0×10^4L·mol^-1·s^-1 and 0.04L
    ·mol^-1·s^-1, respectively. The rate constant of the propagation of growing polymer
    radical is 8.50L·mol^-1·s^-1, and the rate constants of activation and deactivation in
    the atom transfer equilibrium for growing polymer radical are 0.045L·mol^-1·s^-1 and 1.2
    ×10^5L·mol^-1·s^-1, respectively. The values of the rate constants represent the
    features of the ATRP process. The kinetic model was used to calculate the ATRP process of
    DMAEMA. The results show that the calculations agree well with the measurements.
    蒸发鼓泡塔反应器的轴向分散模型
    谢刚, 李希
    . 2004, 12(2):  214-220.  doi:
    摘要 ( )   PDF (2012KB) ( )  
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    Evaporating bubble column reactor (EBCR) is a kind of aerated reactor in which the reaction
    heat is removed by the evaporation of volatile reaction mixture. In this paper, a
    mathematical model that accounts for the gas-liquid exothermic reaction and axial
    dispersions of both gas and liquid phase is employed to study the performance of EBCR for
    the process of p-xylene(PX) oxidation. The computational results show that there are
    remarkable concentration and temperature gradients in EBCR for high ratio of height to
    diameter (H/DT). The temperature is lower at the bottom of column and higher at the top,
    due to rapid evaporation induced by the feed gas near the bottom. The concentration
    profiles in the gas phase are more nonuniform than those (except PX) in the liquid phase,
    which causes more solvent burning consumption at high H/DT ratio. For p-xylene oxidation,
    theo ptimal H/DT is around 5.
    SYSTEM ENGINEERING
    化工过程分离循环系统的多目标模糊优化研究
    孙力, 樊希山, 姚平经
    . 2004, 12(2):  221-226.  doi:
    摘要 ( )   PDF (1833KB) ( )  
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    Separation-recycle system is an important part in chemical process, and its optimization is
    a multiobjective problem. In this paper the process optimization procedure is proposed. The
    fuzzy optimization algorithm with the concept of relative importance degree (RID) is
    utilized to transfer multi-objective optimization (MO-O) model into a single-objective
    optimization (SO-O) framework. The treatment of process condensate in synthesisa mmonia
    plant is taken as example to illustrate the optimization procedure, and the satisfactory
    result demonstrates feasibility and effectiveness of the suggested method.

    PVC生产过程故障传感器的检测与重构
    李元, 周东华, 谢植, S.Joe.Qin
    . 2004, 12(2):  227-233.  doi:
    摘要 ( )   PDF (2221KB) ( )  
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    Based on principal component analysis, this paper presents an application of faulty sensor
    detection and reconstruction in a batch process, polyvinylchloride (PVC) making process. To
    deal with inconsistency in process data, it is proposed to use the dynamic time warping
    technique to make the historical data synchronized first,then build a consistent multi-way
    principal component analysis model. Fault detection is carried out based on squared
    prediction error statistical control plot. By defining principal component subspace,
    residual subspace and sensor validity index, faulty sensor can be reconstructed and
    identified along the fault direction. Finally, application results are illustrated in
    detail by use of the real data of an industrial PVC making process.
    工业PTA氧化过程4-CBA浓度的模糊神经网络模型
    刘瑞兰, 苏宏业, 牟盛静, 贾涛, 陈渭泉, 褚健
    . 2004, 12(2):  234-239.  doi:
    摘要 ( )   PDF (1919KB) ( )  
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    A fuzzy neural network (FNN) model is developed to predict the 4-CBA concentration of the
    oxidation unit in purified terephthalic acid process. Several technologies are used to deal
    with the process data before modeling.First,a set of preliminary input variables is
    selected according to prior knowledge and experience. Secondly,a method based on the
    maximum correlation coefficient is proposed to detect the dead time between the process
    variables and response variables. Finally, the fuzzy curve method is used to reduce the
    unimportant input variables.The simulation results based on industrial data show that the
    relative error range of the FNN model is narrower than that of the American Oil Company
    (AMOCO) model. Furthermore, the FNN model can predict the trend of the 4-CBA concentration
    more accurately.
    基于温度和热容流率同时变化的有分流换热网络弹性设计的研究
    李志红, 罗行, 华贵, W.Roetzel
    . 2004, 12(2):  240-246.  doi:
    摘要 ( )   PDF (2128KB) ( )  
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    A new superstructure model of heat exchanger networks (HEN) with stream splits based on
    rangers of streams supply temperatures and heat capacity flow rates is presented. The
    simultaneous optimal mathematical model of flexible HEN synthesis is established too.
    Firstly, the streams with rangers of supply temperatures and/or the streams with the
    rangers of heat capacity flow rates are pretreated; Secondly, several rules are proposed to
    establish the superstructure model of HEN with splits and the simultaneous optimal
    mathematical model of flexible HEN; Thirdly, the improving genetic algorithm is applied to
    solve the mathematical model established at the second step effectively, and the original
    optimal structure of HEN based on the maximum operation limiting condition can be obtained
    easily; Finally, the rules of heat exchange unit merged and the heat load of heat exchanger
    relaxed are presented, the flexible configuration of HEN satisfied the operation condition
    between the upper and down bounds of supply temperature and heat capacity flow rates can be
    obtained based on the original optimal structure of HEN by means of these rules. A case
    study demonstrates the method presented in this paper is effective
    过程工业中具有能量集成的用水网络优化设计
    都健, 孟小琼, 杜红彬, 俞红梅, 樊希山, 姚平经
    . 2004, 12(2):  247-255.  doi:
    摘要 ( )   PDF (2525KB) ( )  
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    Effective utilization of water and energy is the key factor of sustainable development in
    process industries, and also an important science and technology problem to be solved in
    systems engineering. In this paper,two new methods of optimal design of water utilization
    network with energy integration in process industries are presented, that is, stepwise and
    simultaneous optimization methods. They are suitable for both single contaminant and multi
    -contaminant systems, and the integration of energy can be carried out in the whole process
    system, not only limited in water network, so that energy can be utilized effectively. The
    two methods are illustrated by case study.
    THERMODYNAMICS
    密度泛函理论在非极性纯流体表面性质研究中的应用
    吴畏, 陆九芳, 付东, 刘金晨, 李以圭
    . 2004, 12(2):  256-262.  doi:
    摘要 ( )   PDF (2061KB) ( )  
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    The density functional theory, simplified by the local density approximation and mean-field
    approximation, is applied to study the surface properties of pure non-polar fluids. A
    reasonable long rang correction is adopted to avoid the truncation of the potential. The
    perturbation theory is applied to establish the equation for the phase equilibrium, in
    which the hard-core chain fluid is as the reference fluid and the Yukawa potential is used
    as the perturbation term. Three parameters, elk, d and ms, are regressed from the vapor-
    liquid equilibria, and the surface properties, including density profile, surface tension
    and local surface tension profile are predicted with these parameters.
    空气/水界面上的纯组分磷酯单分子膜的表面状态方程
    曾作祥, 陈琼, 薛为岚, 聂飞
    . 2004, 12(2):  263-266.  doi:
    摘要 ( )   PDF (1216KB) ( )  
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    A surface equation of state, applicable to liquid-expanded (LE) monolayers, was derived by
    analyzing the Helmholtz free energy of the LE monolayers. Based on this equation, a general
    equation was obtained to describe all states of single-component phospholipid monolayers
    during comprassion. To verify the applicability of the equation, π-A isotherms of 1,2-
    dipalmitoylphosphatidylcholine (DPPC), 1,2-dipalmitoylphosphatidylglycerol (DPPG), and 1,2
    -dimyristoyphosphatildylcholine (DMPC) were measured. The comparison between model and
    experimental values indicates that the equation can describe the behavior of pure
    phospholipid monolayers.
    苏氨酸水溶液在298.15K到328.15K区间液相扩散系数的测定和关联
    赵长伟, 马沛生
    . 2004, 12(2):  267-271.  doi:
    摘要 ( )   PDF (1468KB) ( )  
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    The diffusion coefficients of aqueous L-threonine solutions were determined from 298.15K to
    328.15K by the metallic diaphragm cell method with accuracy, promptness and convenience.
    Meanwhile, the densities and viscosities of the solutions were also determined and
    correlated. Based on a seml-empirical model for correlating the diffusion coefficients of
    some amino acids in their aqueous solutions, a new semi-empirical model for correlating the
    diffusion coefficients involving temperature was provided, which is more comprehensive and
    less experiment dependent compared to the previous model. The fitting results are
    satisfactory. Compared to a former model for correlating the diffusion coefficients of
    solid organic salts in their aqueous solutions, this model provides significant improvement
    in correlation of diffusion coefficients with different temperatures avoiding arduous work.
    MCFC动态性能数值模拟
    于立军, 袁俊琪, 曹广益, 姜秀民
    . 2004, 12(2):  272-276.  doi:
    摘要 ( )   PDF (1501KB) ( )  
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    A three dimension of dynamic mathematical model of the molten carbonate fuel cell is
    established,in which the heat generation, mass transfer and electrochemical characteristics
    are described. The performance of the fuel cell including the distributions of the
    temperature and the velocity is predicted numerically. Then the experimental data including
    the output performance of the fuel cell generation system and the temperature distributions
    are compared. The numerical results are in agreement with the experiment results.
    BIOTECHNOLOGY & BIOENGINEERING
    有效微生物接种和渗滤液循环回流对垃圾降解的影响
    沈东升, 何若, 朱荫湄
    . 2004, 12(2):  277-281.  doi:
    摘要 ( )   PDF (1854KB) ( )  
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    Biodegradation of waste in landfill is a slow process requiring decades for completion.
    Accelerated degradation of municipal refuse in modulated landfill environments may
    alleviate or eliminate pollution to the land, water and air. In this work, nineteen
    effective microorganisms (EMs) were isolated fromold landfill refuse by enrichment
    culturing techniques and used for the inoculum of municipal refuse. The preliminary
    experiments demonstrate that a combination of EMs inoculation in landfill with leachate
    recycle resulted in increased rates of decomposition and faster process stability. The
    concentrations of COD, VFA and SO4^2- in digester with EMs inoculation and leachate recycle
    decreased more rapidly than others. Gas production from digester with EMs inoculation and
    leachate recycle commenced around 32 days, which is a week shorter than with leachate
    recycle only. And peak cumulative gas production was obtained much earlier in digester with
    EMs inoculation and leachate recycle (150 days) compared to 180 days with leachate recycle
    only. Moreover, in the first two months, the rate of settlement in digester with EMs
    inoculation and leachate recycle was more rapid than others.
    PROCESS AND PRODUCT TECHNOLOGY
    纳米γ-Fe2O3/SiO2复合氧化物的制备及气敏性质
    马丽景, 闫涛, 白守礼, 黄小葳, 宋永吉, 陈霭璠, LIUChungChium
    . 2004, 12(2):  282-285.  doi:
    摘要 ( )   PDF (1170KB) ( )  
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    Nanostructured γ-Fe2O3/SiO2 complex oxide was prepared by sol-gel method with
    tetraethoxysilane and iron nitrate as precursors. The particle size distribution, thermal
    and phase stabilities and gas sensing properties were systematically characterized by TEM,
    granularity distribution, TG-DTA, XRD and gas sensitivity measurements. The particle size
    is about 10 nm and size distribution is very narrow. The sensitivity of the sensing element
    to CO, H2, C2H4, C6H6 and the effects of calcination temperature on the sensitivity and
    conductance of gases were examined. The combination of excellent thermal stability and
    tunable gas sensing properties through careful control of the preparation and judicious
    selection of material compositions gives rise to novel nanocomposites, which is attractive
    for the sensitive and selective detection of reducing gases and some hydrocarbon gases.
    RESEARCH NOTES
    利用胶质气体泡沫分离细微颗粒
    E.A.Mansur, 王运东, 戴猷元
    . 2004, 12(2):  286-289.  doi:
    摘要 ( )   PDF (1586KB) ( )  
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    This paper presents a method of separation of fine particles, of the order of a few microns
    or less, from aqueous media by flotation using colloidal gasaphrons (CGAs) generated in
    aqueous solutions. More than 150 experiments were conducted to study the effects of
    surfactant type, surfactant concentration, CGAs flow rate, and particle concentration on
    the removal efficiency (fine particles of polystyrene were used as a target compound). The
    results indicate that CGAs, generated from cationic surfactant of hexdecyltrimethyl
    ammonicum bromide (HTAB) and anionic surfactant of sodium dodecylbenzne sulfonate (SDBS),
    are an effective method for the separation off ine particles of polystyrene from
    wastewater. The flotation yields are higher than 97%.
    一个封闭的潜热热能存储系统的第一与第二定律分析
    A.SARI, K.KAYGUSUZ
    . 2004, 12(2):  290-293.  doi:
    摘要 ( )   PDF (1263KB) ( )  
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    First and Second Law analyses were conducted to evaluate the performance of a closed latent
    heat thermal energy storage (LHTES) system employing calciumchloride hexahydrate (CaCl2-
    6H2O).The First and the Second Laws of thermodynamics were applied to the system from
    viewpoint of energy and exergy analyses,respectively. The energy storage tank in the system
    is neither fully mixed nor fully stratified. It may be considered as semithermal
    stratified. Experiments that include both charging and discharging periods were performed
    on sunny winter days in 1996. The energy and exergy variations and the overallenergy and
    exergy efficiencies of the closed LHTES system were calculated for the complete charging
    and discharging cycle of the selected fifteen clear-sky winter days. Mean energy and exergy
    efficiencies were found to be 55.20% and 34.83%, respectively.
    酮麝香、二甲苯麝香和1,3-二甲基-2,4-二硝基-5-叔丁基苯固-液相平衡研究
    曲红梅, 白鹏, 杨志才, 余国琮
    . 2004, 12(2):  294-296.  doi:
    摘要 ( )   PDF (707KB) ( )  
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    The solid-liquid equilibria of musk ketone + musk xylene, musk xylene+1,3-dimethyl-2,4-
    dinitro-5-tert-butyl benzene are measured by differential scanning calorimeter (DSC), these
    systems are proved to be simple eutectics. Moreover the melting points and the fusion
    enthalpies of musk ketone, musk xylene and 1,3-dimethyl-2,4-dinitro-5-tert-butyl benzene
    are also measured by the DSC. These solid-liquid equilibrium data and the heats of fusion
    are reportedfor the first time. Then UNIFAC model is used to correlate the solid-liquid
    equilibrium data.It is shown that the solid-liquid equilibria of musk systems can be
    predicted bv the UNIFAC model.
    多组分吸附过程的吸附速率模型
    姚春才
    . 2004, 12(2):  297-301.  doi:
    摘要 ( )   PDF (1213KB) ( )  
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    Three adsorption rate models are derived for multicomponent adsorption systems under either
    pore diffusion or surface diffusion control. The linear driving force (LDF) model is
    obtained by assuming a parabolic intraparticle concentration profile. Models I and Ⅱ are
    obtained from the parabolic concentration layer approximation. Examples are presented to
    demonstrate the usage and accuracy of these models. It is shown that Model I is suitable
    for batch adsorption calculations and Model Ⅱ provides a good approximation in fixed-bed
    adsorption processes while the LDF model should not be used in batch adsorption and may be
    considered acceptable in fixed-bed adsorption where the parameter Ti is relatively large.
    在非等温条件下石膏和硼石膏的加热脱水动力学研究
    I.Y.Elbeyli, S.Piskin
    . 2004, 12(2):  302-305.  doi:
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    Thermal dehydration of gypsum and borogypsum was investigated under nonisothermal
    conditions in air by using simultaneous thermogravimetric-differentialthermal analyzer.
    Nonisothermal experiments were carried out at various linear heating rates. Kinetics of
    dehydration in the temperature range of 373-503 K were evaluated from the DTA (differential
    thermal analysis)-TGA (thermogravimetric analysis) data by means of Coats-Redfern,Kissinger
    and Doyle Equations. Values of the activation energy and the pre-exponential factor of the
    dehydration were calculated. The results of thermal experiments and kinetic parameters
    indicated that borogypsum is similar to gypsum from dehydration mechanism point of view
    although it consists of boron and small amount of alkali metal oxides.
    不同硫化氢流率与浓度对硫化氢固体氧化物燃料电池性影响
    钟理, 张腾云, 陈建军, WEIGuolin, LUOJingli, K.Chung
    . 2004, 12(2):  306-309.  doi:
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    A solid state H2S/air electrochemical cell having the configuration of H2S,
    (MoS2+NiS+Ag)/YSZ/Pt,air has been examined with different H2S flow rates and concentrations
    at atmospheric pressure and 750-850℃.Performance of the fuel cell was dependent on anode
    compartment H2S flow rate and concentration. The cell open-circuit voltage increased with
    increasing H2S flow rate. It was found that increasing both H2S flow rate and H2S
    concentration improved current-voltage and power density performance. This is resulted from
    improved gas diffusion in anode and increased concentration of anodic electroactive
    species. Operation at elevated H2S concentration improved the cell performance at a given
    gas flow rate. However, as low as 5% H2S in gas mixture can also be utilized as fuel feed
    to cells. Highest current and power densities, 1750mA·cm^-2 and 200mW·cm^-2,are obtained
    with pure H2S flow rate of 50 ml·min^-1 and air flow rate of 100ml·min^-1 at 850℃.
    膨胀床应用中的高密度薄壳型琼脂糖凝胶介质、流体力学与固相分布
    周鑫, 史清洪, 白姝, 孙彦
    . 2004, 12(2):  310-314.  doi:
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    Two dense pellicular agarose-glass matrices of different sizes and densities, i.e., AG-S
    and AG-L, have been characterized for their bed expansion behavior, flow hydrodynamics and
    particle classifications in an expanded bed system. A 26 mm ID column with side ports was
    used for sampling the liquid-solidsuspension during expanded bed operations. Measurements
    of the collected solid phase at different column positions yielded the particle size and
    density distribution data. It was found that the composite matrices showed particle size as
    well as density classifications along the column axis, i.e., both the size and density of
    each matrix decreased with increasing the axial bed height. Their axial classifications
    were expressed by a correlation related to both the particle size and density as a function
    of the dimensionless axial bed height. The correlation was found to fairly describe the
    solid phase classifications in the expanded bed system. Moreover, it can also be applied to
    other two commercial solid matrices designed for expanded bed applications.
    多孔阳极氧化铝模板组装Fe纳米线及其表征
    迟广俊, 姚素薇
    . 2004, 12(2):  315-318.  doi:
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    Fe nanowire arrays are prepared by electrodeposition in porous anodic aluminum oxide
    template from a composite electrolyte solution. These nanowires have an uniform diameter of
    approximate 25 nm and a length in excess of 2.5μm.The micrographs and crystal structures
    of Fe nanowlres are studied by transmission electron microscopy (TEM), selected-area
    electron diffraction (SAED), and X-ray diffraction(XRD). It is found that each nanowire is
    essentially a single crystal and has a different orientation in each array. Hysteresis
    loops of Fe nanowire array show that its easy magnetization direction is perpendicular to
    the sample plane.