湿化学法制备钙钛矿型La_（1－x）Sr_xMnO_3的电学性能及其晶体学研究

采用湿化学法制备了粒度在０．２～０．８μｍ范围的钙钛矿型Ｌａ（１－ｘ）Ｓｒ＿ｘＭｎＯ＿３粉末，用室温和高温Ｘ衍射法测定其晶体结构。发现其在１２００℃高温发生了四方→立方的相变；制备的粉末粒度与水浴温度有一定的关系，在室温时电阻率在６．０×１０￣（－３）～６．９×１０￣（－３）Ω·ｃｍ范围内，在温度大于４５０℃后，随着温度的升高，电阻率亦升高。     

硼对a—Si：H薄膜中氢含量的影响

应用核反应分析法（ＮＲＡ）测量了反应溅射法制备的ａ－ＳｉＨ（Ｂ）薄膜中Ｂ和Ｈ的含量．结果表明：当掺杂比率Ｙｇ（＝［Ｂ２Ｈ２］／（［Ａｒ］＋［Ｈ２］））由１０－６增大到１．４×１０－２时，样品中的硼含量ｃＢ由１．０×１０１８线性增大到１．４×１０２２ａｔｃｍ－３；而氢含量的变化分为三个区域：在微掺硼情况（Ｙｇ＝１０－６），样品中氢含量较未掺硼时高出１０％；当Ｙｇ＝１０－６到１０－３变化时，Ｈ含量ｃＨ由２８％线性减少到１７％；在Ｙｇ＝１０－３时，Ｈ含量达极小值，此后，Ｙｇ增大，Ｈ含量随之增大．     

非离子型微乳液对铜─二甲酚橙分光光度分析的增敏作用

以含水量为９４．１％的非离子型乳化剂ＯＰ／ｎ－Ｃ５Ｈ１１ＯＨ／ｎ－Ｃ９Ｈ２０／Ｈ２Ｏ微乳液为介质，进行了Ｃｕ（１１）－二甲酚橙ＯＸ分光光度法研究（ε＝３．６×１０４Ｌ·ｍｏｌ－１·ｃｍ－１），与以水为介质（ε＝５．２×１０３Ｌ·ｍｏｌ－１·ｃｍ－１）及相同含水量的乳化剂ＯＰ胶束介质（ε＝１．１４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１）相比较，测定灵敏度显著增加，样品分析结果令人满意。     

铅（II）－1－［（5－溴－2－吡啶）偶氮］－2，7－萘二酚－吐温－80体系光度法测定铅的研究

研究了在吐温－８０存在下，铅（ＩＩ）与合成的１－［（５－溴－２－吡啶）偶氮］－２，７－萘二酚（简称５－Ｂｒ－ＰＡＤＮ）的显色条件和光度特性。非离子表面活性剂吐温－８０主要起增溶作用。显色反应在５０℃时１０ｍｉｎ内即可完成，配合物在ｐＨ３．０～６．０之间的吸光度大而稳定，最大吸收波长λｍａｘ＝５９０ｎｍ，摩尔吸光系数ε＿（５９０）＝８．３１×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）．Ｐｂ￣（２＋）含量在０～２０μｇ·（２５×１０￣（－３）Ｌ）￣（－１）范围内遵守比尔定律。拟定方法的选择性较好，已用于树叶表面上和人发中铅的测定，获满意结果。     

新显色剂6—Me—BTAEB的酸碱平衡及其与镍（Ⅱ）显色反应的研究

该文研究了新显色剂２－［２－（６－甲基苯并塞唑）偶氮］－５－二乙氨基苯甲酸（６－Ｍｅ－ＢＴＡＥＢ）的酸碱平衡及其与镍（Ⅱ）的显色反应。实验结果表明,在十二烷基硫酸钠（ＳＤＳ）存在下,６－Ｍｅ－ＢＴＡＥＢ与镍（Ⅱ）在ｐＨ４．５～８．３缓冲溶液中形成稳定的蓝紫色络合物,其组成为Ｎｉ（Ⅱ）∶６－Ｍｅ－ＢＴＡＥＢ＝１∶２,最大吸收波长为６５０ｎｍ,表现摩尔吸光系数为１．６７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１镍（Ⅱ）浓度在０～１０μｍ／２５ｍｌ范围内服从比尔定律。方法可直接用于铝合金中微量镍的测定,结果满意。     

在表面活性剂存在下泰尔登的电分析化学特性研究

在ｐＨ７．００缓冲溶液中，当有０．００２０％ＯＰ存在时，泰尔登在－１．９５Ｖ产生一灵敏极谱波，利用此波可测定痕量泰尔登，检测下限为５．４×１０￣（－９）ｍｏｌ／Ｌ。用恒电位库仑法，计时库仑法和循环伏安法测得反应电子数为２，吸附量为１．１７×１０￣（－１０）ｍｏｌ／ｃｍ￣２，扩散系数为４．３×１００￣（－５）ｃｍ￣２／ｓ。     

ZnCl2与POM的合成和结构

ＺｎＣｌ２与ＰＯＭ生成１：２加成物「Ｚｎ（ＰＯＭ）２Ｃｌ２」，Ｃ１２Ｈ１２Ｃｌ２Ｎ４Ｏ６Ｚｎ，晶体必三科晶系，空间群为Ｐ１，晶胞系数为ａ＝１１．７５５（１１）×１０＾－１０ｍ，ｂ＝１２．３５７４（７）×１０＾－１０ｍ，ｃ＝６．５９２（４）×１０＾－１０ｍ，ａ＝１０２。７３２（５）°，β＝９２．０７４（６）°，γ＝１１０．１２４（６０°，Ｖ＝８７６．２×１０＾－３０ｍ，ＭＲ＝４４４．５３，ｚ＝２，ｄ     

CTMAB存在下铬（Ⅲ）与PAR及三乙醇胺的显色反应

研究了在溴化十六烷基三甲基铵（ＣＴＭＡＢ）存在下，铬（Ⅲ）与４－（２－吡啶偶氮）－间苯二酚（ＰＡＲ）及三乙醇胺（ＴＥＡ）的显色反应。结果表明在ｐＨ６．８～７．８的三乙醇胺及其盐酸盐的缓冲体系中，经沸水浴２０ｍｉｎ，Ｃｒ（Ⅲ）－ＰＡＲ－ＴＥＡ显色完全，ＣＴＭＡＢ有较好的增敏及稳定作用；λ_（ｍａｘ）＝５４０ｎｍ，ε_（５４０）＝５．６×１０~４Ｌ·ｍｏｌ~（－１）·ｃｍ~（－１），Ｃｒ（Ⅲ）含量在０．８－８×１０~（－４）ｇ·Ｌ~（－１）范围内吸光度遵从比尔定律。     

离体玉米精细胞的电泳分析与分离

细胞显微电泳表明，介质ＰＨ值对离体玉米精细胞电泳迁移率有较大影响，在ＨＣｌＧｌｙ（甘氨酸）缓冲液中，其等电点介于ＰＨ２．４－３．０；在ＰＨ６．７的ＭＥＳ缓冲液中，电泳后统计分析表明，离体玉米精细胞可以区分为电泳迁移率有差异的２种类型，其电泳迁移率分别为（１．８０３±０．０４３）×１０＾－６和（１．６６７±０．０５２）×１０＾－６ｍ＾２．Ｖ＾－１．ｓ＾－１。根据电泳迁移率的差异，利用一种支无持细胞电     

离心光度法测定酒中微量Zn（Ⅱ）的方法研究

研究了一种高灵敏测定酒中微量Ｚｎ（Ⅻ）的新方法－离心光度法，在ｐＨ为１．３０的Ｚｎ－ＳＣＮ－ＣＶ三元离子缔合物体系中，λｍａｘ为５９８ｎｍ的表观摩尔吸光系数ε５９８为３．３９×１０＾５Ｌ．ｍｏｌ＾－１ｃｍ＾－１，Ｚｎ（Ⅱ）在１．５×１０＾－６－１３．８×１０＾－６ｍｏｌ．Ｌ＾－１范围内呈线性关系。     

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