插入法制备镁铝氢氧化物的性质研究

利用Ｘ射线衍射及微电泳的方法研究了镁铝氢氧化物正电溶胶．结果表明：随着ｍ（Ｍｇ）∶ｍ（Ａｌ）比值的增加，其溶胶的固含量和粒子ζ电位均增加，在ｍ（Ｍｇ）∶ｍ（Ａｌ）≥３∶１，溶胶中只有镁铝氢氧化物，其结构为类水滑石结构，六方晶系，三层叠加结构；随着胶溶温度的升高，镁铝氢氧化物的晶胞常数也随之增加，颗粒形状趋向于规则的六角层状，颗粒粒径和溶胶粒子ζ电位随胶溶和陈化温度的升高而增加．     

插入法制备镁铝氢氧化物的性质研究

利用Ｘ－射线衍射及微电泳的方法研究了镁铝氢氧化物正电溶胶。结果表明：随着ｍ（Ｍｇ）：ｍ（Ａｌ）比值的增加，其溶胶的固含量和粒子ζ电位均增加，在ｍ（Ｍｇ）：ｍ（Ａｌ）≥３：１，溶胶中只有镁铝氢氧化物，其结构为类水滑石结构，六方晶系，三层叠加结构，随着胶溶温度的升高，镁铝氢氧化物的晶胞常数也随之增加，颗粒形状趋向于规则的六角层状，颗粒粒径和溶胶粒子ζ电位随胶溶和陈化温度的升高而增加。     

一些金属对Al-Mg-Mn-RE合金材料耐腐蚀性能的影响

研究了铁、硅、镁、锰和稀土对Ａｌ－Ｍｇ－Ｍｎ－ＲＥ合金材料耐腐蚀性能的影响．利用重量法和电化学法同时测量材料的腐蚀速率．测量结果表明：合金材料的耐腐蚀性能随着铁、硅含量的增加而显著降低;当镁含量在４．５％以下,锰的含量在０．５５％～０．６５％,稀土的含量在０．３％左右时,材料的耐腐蚀性能最好．     

Mg-Ni非晶合金电极容量衰退机理研究

对Ｍｇ－Ｎｉ非晶合金电极的容量衰退机理研究表明，充放电过程中Ｍｇ在电解液中的腐蚀氧化是导致其容量急剧降低的主要原因，所形成的Ｍｇ（ＯＨ）２腐蚀产物包围在合金颗粒周围使其与周围基体脱离接触不参与吸放氢。     

一些金属对Al-Mg-Mn-RE合金材料耐腐蚀性能的影响舷

研究了铁,硅,镁,锰和稀土对Ａｌ－Ｍｇ－Ｍｎ－ＲＥ合金材料耐腐蚀性能的影响,利用重量法和电化学法同时测定材料的腐蚀速率,测量结果表明,合金材料的耐腐蚀性能随着铁,硅含量的增加而显著降低;当镁含量在４．５％以下,锰的含量在０．５５％－０．６５％,稀土的含量在０．３％左右时,材料的耐腐蚀性能最好。     

槟榔花粉的生物学,氨基酸和化学元素含量研究

研究结果表明,槟榔花粉呈球形或扁球形,极轴长２６ μｍ（２４ ．２ ～２７ ．８ μｍ ） ,赤道轴长２７ ．２ μｍ（２５ ．３ ～２９ ．１ μｍ） ,有两层壁,外壁含有多种生理活性物质;有１７ 种氨基酸,总含量按干重计,三亚崖城（４０．３２ ｍｇ／ｇ） ＞ 琼中湾岭（３９ ．７２ ｍｇ／ｇ）,其中Ａｓｐ、Ｇｌｕ 、Ｌｙｓ 含量较高,分别为５ ．８７ ｍｇ／ｇ、４ ．３８ ｍｇ／ｇ、３ ．８７ ｍｇ／ｇ．９ 种必需氨基酸和６ 种增香氨基酸的组分总量,均以三亚崖城＞ 琼中湾岭,药效氨基酸则以琼中湾岭＞ 三亚崖城;化学元素含量以宏量元素Ｋ＞ Ｍｇ＞ Ｃａ＞ Ｐ＞ Ｎａ,微量元素Ｓｉ＞ Ｍｎ＞ Ｆｅ＞ Ｚｎ＞ Ｐｂ ＞ Ｃｕ 、Ｎｉ．     

乙烯气相聚合高效催化剂的组成和聚合反应

研究了２种类型的乙烯气相聚合高活性催花剂．用ＳｉＯ２,ＭｇＣｌ２作复合载体,负载ＴｉＣｌ４制得的ＳＭ型催化剂,载体中含ｗ（Ｔｉ）为２％～３％,ｗ（Ｔｉ３＋）为３５％～５９％,比表面积１０５～１２０ｍ２／ｇ,催化活性每小时每克催化剂Ｔｉ催化得５．０～５．７ｋｇ产物ＰＥ（ｋｇ·ｇ－１·ｈ－１）,聚合动力学曲线为衰减型．用镁粉、卤代烷、四氯化钛为主要组分制备的ＭＧ－２型催化剂,载体中ｗ（Ｔｉ）为６％～７％,ｗ（Ｔｉ３＋）为５５％～６９％,比表面积７０～８５ｍ２／ｇ,催化活性１．８～２．０ｋｇ·ｇ－１·ｈ－１,聚合动力学曲线为平稳型．对ＳＭ型催化剂扫描电镜及图象分析得到颗粒平均粒径（ｄ）,颗粒长短轴比（ｄｌ／ｄｓ）及颗粒大小粒径比（ｄｍａｘ／ｄｍｉｎ）分别为３１μｍ,１．４０２,４．１,ＭＧ－２型催化剂为３３μｍ,１．５２４,７．０,相应聚合产物颗粒的ｄ,ｄｌ／ｄｓ,ｄｍａｘ／ｄｍｉｎ,ＳＭ型催化剂为２４７μｍ,１．２９５,４．６,ＭＧ－２型催化剂为２６３μｍ,１．５４０,９．０．显示出ＳＭ催化剂更优良的聚合性能．     

绿竹林铜锌锰元素的含量特征及其动态

主要研究了闽南绿竹（Ｄｅｎｄｒｏｃａｌａｍｏｐｓｉｓｏｌｄｈａｍｉ）林Ｃｕ、Ｚｎ、Ｍｎ元素的含量特征,绿竹叶以及细根分解过程中Ｃｕ、Ｚｎ、Ｍｎ含量的月变化．结果表明：（１）Ｃｕ、Ｚｎ、Ｍｎ在绿竹林各组分的含量大小不同,除根茎Ｍｎ的含量低于Ｃｕ和Ｚｎ外,其余组分Ｍｎ的含量均高于Ｃｕ和Ｚｎ的含量;绿竹林各组分中Ｃｕ的含量在４．５４～４２．８２μｇ／ｇ,Ｚｎ的含量在４．９２～４４．０７μｇ／ｇ,Ｍｎ的含量在２６．３５～２３１．８６μｇ／ｇ;（２）１９９７年１月绿竹林Ｃｕ、Ｚｎ、Ｍｎ的库存量分别为０．２５２、０．３４０、２．０２０ｇ／ｍ２,库存量的大小顺序是：Ｍｎ＞Ｚｎ＞Ｃｕ;（３）１９９６年７月至１９９７年６月一年中各月绿竹叶Ｍｎ的含量都高于Ｃｕ和Ｚｎ的含量,Ｍｎ和Ｚｎ的月动态模式是单峰型,Ｃｕ的月动态模式呈现不规则类型;（４）绿竹细根的分解过程中,Ｍｎ含量在前二个月先累积,而后逐渐释放;Ｃｕ含量波动较小;Ｚｎ的含量则处于累积与释放的相间波动之中     

049Al-Li合金的时效组织和拉伸性能

研究了０４９Ａｌ－Ｌｉ合金的时效组织和室温拉伸性能以及改变Ｃｕ，Ｍｇ含量对合金组织和性能的影响，实验结果表明，在人工时效状态，０４９合金中的析出强化相为Ｔ１相．由于Ａｇ和Ｍｇ的添加促进了Ｔ１相的析出而使合金获得高的强度。减少０４９合金中Ｃｕ的含量或增加Ｍｇ的含量都导致Ｔ＿１，相析出数量的减少，从而降低合金强度，对少量Ａｇ，Ｍｇ促进Ｔ＿１相析出的机制进行了讨论。     

浅议镁和碱反应

镁同碱反应未见有报道．文献［３～６］认为：“镁不能跟碱反应”．本文的热力学计算数据和实验事实都证明，镁能和固体碱反应，反应的化学方程式是：２ＮａＯＨ（ｓ）＋Ｍｇ（ｓ）＝ＭｇＯ（ｓ）＋Ｎａ２Ｏ（ｓ）＋Ｈ２（ｇ）↑．     

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