锑在硫酸溶液中阳极形成膜半导体性质的研究(Ⅰ)

本工作研究了锑电极在0.9V(VS. Hg/Hg_2SO_4)分别于4.5mol/LH _2SO_4和0.05mol/LH_2SO_4+0.5mol/LNa_2SO_4溶液中,恒电位阳极成膜3小时后膜的主要组成及其生长规律以及膜的半导体性质。x射线衍射分析、线性电位扫描证实锑在上述两种溶液中阳极膜的组成不同,前者主要由Sb_2O_3和Sb_2(SO_4)_3组成,后者是Sb_2O_3。交流阻抗测量和白光电流分析,前者是一种无定形n-型半导体,后者是晶形半导体且平带电位和载流子密度分别为-0.31V(VS. Hg/Hg_2SO_4/0.05mol/LH_2SO_4)和4.0×10~(19)cm~(-3)。     

γ-MnO2膜电极的电化学调制光谱

采用自制的 T- 1EMS电化学调制光谱仪研究了γ- Mn O2 膜电极在 1mol· L- 1 NH4Cl溶液中的电化学调制光谱 (EMRS)特性 .实验结果表明γ- Mn O2 膜电极的 EMRS有明锐的Franz- Keldysh振荡峰 ,显示了其半导体特性 .根据 Aspnes的“三点法”,由谱图计算出了γ-Mn O2 的禁带宽度 ;并根据γ- Mn O2 膜电极的 EMRS随直流偏置电位的变化 ,确定出其在 1mol·L- 1 NH4Cl溶液中的平带电位值 .这些参数为研究 γ- Mn O2 电极的半导体性质和界面结构提供了重要信息     

聚噻吩修饰纳米结构TiO2膜电极光电性能研究

用光电流作用谱、光电流-电势图等光电化学方法研究了聚噻吩(PTh)膜和纳米结构TiO2/聚噻吩(ITO/TiO2/PTh)复合膜的光电转换性质。结果表明,PTh膜的禁带宽度为2.02eV,价带位置为-5.86 eV,导带位置为-3.84 eV。在ITO/TiO2/PTh复合膜电极中存在p-n异质结,在一定条件下异质结的存在有利于光生电子-空穴对的分离,PTh修饰ITO/TiO2电极可使光电流产生波长发生明显红移,从而提高了宽禁带半导体的光电转换效率。在实验条件下,单色光的光电转换效率最高可达到13%。     

硫氮氧杂大环汞修饰电极的研究

利用合成的新型硫氮氧杂大环化合物为载体制备了ＰＶＣ膜汞（Ⅱ）修饰电极．该电极对汞（Ⅱ）的线性响应范围为８×１０－６～６×１０－３ｍｏｌ·ｌ－１，对大多数金属离子的选择性系数小于１×１０－３．还研究了修饰电极的各种性能，讨论了修饰电极的响应机理，并将修饰电极应用于直接电位法和电位滴定法的测定中．     

H2SO4—NaCl溶液中奥氏体不锈钢应力腐蚀开裂

在室渐下研究了奥氏不锈钢在Ｈ２ＳＯ４－ＮａＣｌ溶液中应力腐蚀开裂敏感性。结果表明，应力腐蚀受外加电位和氯化物浓度的影响。在２．５（Ｈ２ＳＯ４）－０．２～０．６ＭＯＬ．ＤＭ＾－３（ＮａＣｌ）溶液中发生穿晶型应力腐蚀开裂，在极化曲线的活化－钝化过渡区电位区间发生腐蚀开裂。应力腐蚀开裂可归因于位错的滑移台阶出现而导致钝化膜的破裂。应力腐蚀可归因于位错的滑移台阶出现而导致钝化膜的破裂，再经过选择性电化学溶     

CdSe膜电极在Na2SO3溶液中的电化学调制光谱

本采用本实验室研制的T-1 EMS电化学调制光谱仪研究了电沉积CdSe电极在1mol／L Na2SO3溶液中的电化学调制光谱(EMRS)特性．实验结果表明，CdSe电极在Na2SO3溶液中的EMRS具有典型的Franz—Keldysh振荡峰．根据Aspnes提出的弱电场三阶微商电解液电反射理论，对CdSe电极的EMRS进行了定量分析，计算出了CdSe电极的禁带宽度和展宽系数等相关参数．结合EMRS随直流偏置电位的变化，快速、准确地确定出CdSe电极在NaSO3溶液体系中的平带电位值．这些参数为研究CdSe电极的半导体性质和界面结构提供了重要信息．     

H_2SO_4－NaCl溶液中奥氏体不锈钢应力腐蚀开裂

在室温下研究了奥氏体不锈钢在Ｈ＿２ＳＯ＿４－ＮａＣｌ溶液中的应力腐蚀开裂敏感性．结果表明，应力腐蚀受外加电位和氯化物浓度的影响．在２．５（Ｈ＿２ＳＯ＿４）－０．２～０．６ｍｏｌ·ｄｍ￣（－３）（ＮａＣｌ）溶液中发生穿晶型应力腐蚀开裂，在极化曲线的活化。钝化过渡区电位区间发生腐蚀开裂。应力腐蚀开裂可归因于位错的滑移台阶出现而导致钝化膜的破裂，再经过选择性电化学溶解而产生．     

Cl-对N80油套管钢钝化膜半导体性能的影响

利用电化学阻抗谱技术研究了N80油套管钢在0．05mol／L NaHCO3溶液中所成钝化膜的电化学性能，借助于莫特-肖特基曲线分析了成膜电位、测试频率以及Cl^-浓度对钝化膜半导体性能的影响．结果表明：钝化膜呈n型半导体特征；随着成膜电位的增加，膜的容抗和施主密度减小；随着Cl^-浓度的增加，膜的容抗和施主密度增加，膜的点蚀现象加剧．X射线光电子光谱（XPS）分析结果表明，钝化膜主要由Fe的氧化物Fe2O3和FeO组成．     

下期文章摘要预报

路面结构中地基顶面当量回弹模量的换算 姜爱锋,姚祖康 指出了现行水泥混凝土路面设计规范中在多层地基模量换算方面存在的问题,分析存在问题的原因,给出了目前常用路面结构形式下切实可行的解决方法. 基于八叉树的隐式曲面与隐式曲面求交 余正生,吴启迪,李启炎 先将隐式曲面进行多边形化,两隐式曲面的求交,采用八叉树来搜索它们相应的两组多边形面片的交线.这一方法既避免了解析法对所给定隐式曲面要有特殊要求的局限性,又能克服数值法遇到初始点选取和迭代收敛性问题,算法准确可靠. 切削振动计算机仿真的数值方法 李沪曾,于信汇,呙清强 以平面端铣为例,介绍了应用Runge-Kutta方法求解机床结构多自由度系统运动微分方程组仿真切削振动的公式和算法.数字仿真铣削强迫振动和自激振动的结果,与采用Simpson-快速卷积-迭代法求解系统运动积分方程组仿真的结果相当接近,并与他人研究结论相符,证明了两种数值方法的收敛性,为它们用于切削振动计算机仿真的可行性提供了佐证. 中性水溶液中碳钢钝化膜的光电响应 吴斌,王建信,李义久,倪亚明 用光电响应方法测量了pH=8.4的硼砂-硼酸缓冲溶液中碳钢电级上钝化膜的光电化学行为.通过研究光响应电流iph与入射光能量hγ(波长λ)和外加扫描电位U的关系,指出的碳钢电极在中性溶液中形成的钝化膜具有n型半导体的性质.半导体特征参数(禁带能量Eg和平带电位Ufb)表明,钝化膜为晶形和无定形(主要为无定形)γ-Fe2O3组成的无序结构,其禁带能量为2.01 eV(晶形)和2.34 eV(无定形),平带电位为-0.10 V,这和钝化膜的X射线衍射(XRD)实验结果一致.并导出了无定形半导体材料的光响应电流iph与外加电位U之间的一般关系式. 高压直流电场强化垂直管内沸腾传热试验研究 安恩科,姜富明,魏敦崧,陈之航 在分离式热管结构的电水动力学(EHD)强化试验台上,采用R11工质、直流高压电场,首次完成了垂直管内沸腾换热的EHD强化试验研究.结果表明：采用EHD技术对垂直管内的沸腾换热有明显的强化效果;低热流密度时,强化效果较好,增大热流密度时,强化效果减弱;当热流密度维持不变时,强化系数随着电场电压的增大而增大;沸腾换热的最大强化系数为428％. 大面积屋顶上下表面脉动风压的相关性分析 庞加斌,朱乐东,陈伟 通过对武汉体育场屋顶风洞试验上下表面同步测压数据的分析,研究了屋顶上下表面脉动风压的相关性及其和屋顶动风荷载之间的关系,并通过分析文献[1]建议的脉动风压计算方法可能产生的误差,初步讨论了体育场大面积屋顶结构在抗风实验研究中上下表面非同步测压技术的可行性和可靠性,以及采用上下同步测压的必要性. 企业多元化战略选择的多维信号博弈模型 李宇宏,沈荣芳 运用博弈论及信息经济学中非对称信息下的信号博弈理论,建立了一个企业多元化战略选择的多维信号博弈模型.通过对此模型的分离均衡分析,阐述了企业多元化的战略意义在于传递企业成本类型和市场需求类型以获取竞争优势. 利用高分辨率成像测井技术识别沉积构造 钟广法,马在田 基于塔里木盆地地层微电阻率成像测井(FMS/FMI)解释,探讨沉积构造在FMS/FMI图像上的特征及识别方法.层面及沉积构造在FMI/FMS图像上通过灰度或颜色的变化而表现出来.灰度突变界面指示各种层面,包括平坦状层面、非平坦状冲刷面和不整合面.根据层内灰度微细变化面--纹层面与层面的关系,及纹层面的倾角变化模式,可以区分水平/平行层理及各种交错层理.纹层连续性破坏或纹层面扭曲等特征指示准同生变形构造的存在.根据FMI/FMS图像解释的交错层理的产状可以推断古水流方向. 桥梁桩承台体系抗扭研究 舒翔,陈竹昌,祝龙根 通过刚性桩承台体系和弹性桩承台体系的受力计算以及桩基础的模型试验,研究了桩承台体系在扭矩作用下的桩顶内力分布.结果表明,可以按照绝对刚性承台假定来分析桩承台体系的受力. 建设项目的价值T程与价值管理 孙继德,沈继红 价值工程(VE)应用到建设项目中可以产生巨大的效益.价值管理(VM)是对价值工程(VE)的发展,其含义、研究时间、研究内容和范围都比VE拓宽了.VM对提高建设项目的投资将更加有效,因此VE发展到VM具有重要意义.据此对VE,VM进行了比较分析. 自动控制加药系统在微絮凝过滤中的应用 李伟英,范瑾初 通过中试试验并结合理论分析,对用于微絮凝过滤中的流动电流检测仪自动控制加药技术作了较为系统的分析和研究.试验结果表明：在通常情况下(以某水库作为源水,其浊度小于20 ntu),该水库水流动电流设定值(Sp)应为-17.5;加药管线流动时间为50～60 s;取样系统流量(q出)选用应恒定.由此得出结论：某水库水采用流动电流自动控制混凝加药技术是可行的. 基础隔震房屋模型振动台对比试验与分析 施卫星,吕西林,朱玉华,冯德民 采用日本生产的铅芯橡胶支座作为基础隔震支座,以中国和日本在建的中高层房屋为工程背景,进行了基础隔震模型和基础固定房屋模型模拟地震动振动台试验,并引入能量分析方法对两种试验结果进行了分析比较.结果表明该基础隔震系统隔震效果明显,隔震层滞回变形能有效吸收地震动输入能量,减小模型结构的塑性变形和累积损伤. 管节-接头的弹性地基梁法及顶管施工模拟分析 丁文其,朱合华,杨金松,范明星,葛金科 针对曲线顶管工程的特点,通过建立管节-接头力学模型及弹性地基梁法,对顶管施工的顶力、管接头张开量、管段内力、土体抗力及土体的稳定性等进行了计算与分析.研究成果在大口径小半径曲线顶管施工实践中的成功应用,证明其对今后同类工程具有较好的指导意义和实用推广价值. 单桩沉降遮拦效应的研究 林永国,周正茂,刘国彬 针对桩基沉降中普遍存在的遮拦现象,提出了用剪切位移法分析单桩沉降遮拦效应的方法,并推导了相应的理论公式.结合上海的地质情况对单桩的遮拦效应进行了分析,结果表明：桩对土体深度方向的差异沉降具有明显的遮拦效应,桩刚度对遮拦效果影响较大,遮拦桩不宜使用柔性桩,否则遮拦效果较差;遮拦桩轴向刚度接近于受荷桩轴向刚度时,已可获得理想的遮拦效果,再增大遮拦桩的刚度意义不大. 高效液相色谱法同步测定花粉中的水溶性维生素 潘建国,王开发,郑尧隆,刘远红 采用液相色谱法同步测定花粉中的水溶性维生素C、维生素B1、维生素B2和维生素B5,四种维生素在ODS-5 μm色谱柱上分离,用pH 5.01磷酸缓冲液-甲醇(体积比为75：25)为流动相洗脱,流速为1.0 ml·min-1,波长为260 nm,10 min内实现良好分离.在(1～20)×10-6范围内进样量和响应值呈良好线性关系.其回收率为94.37％～101.57％,变异系数为1.90％～8.23％,精密度和准确度良好.为快速、准确地同步测定花粉中的水溶性维生素提供了一种新的方法.     

锑在硼砂溶液中阳极极化膜半导体性质的研究（续）

本工作利用白光电流和交流阻抗法研究了锑在０．０５ｎ１Ｏｌ·ｄｍ￣（－３）Ｎａ＿２Ｂ＿４Ｏ＿７＋、０．５ｍｏｌ·ｄｍ“Ｎａ２Ｓｏ４溶液中（ＰＨ一９．ｌ，３０Ｃ）于１．２ｖ（ｖＳ。ＳＣＥ）阳极形成膜的半导体性质。实验结果表明，该阳极膜是一种ｎ型半导体，其平带电位为一０．３６Ｖ，施主密度为２．８×ｌ０￣１８ｃｍ￣（－３）。讨论了锑增加对在硫酚溶液中形成的阳极ｐｂ（Ⅱ）氧化物膜生长的影响。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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