机械合金化方法制备Fe－Si纳米晶粒子的研究

用机械合金化（ＭＡ）方法制备了Ｆｅ１００－ｘＳｉｘ（ｘ＝２０．３０．４０．７０）纳米粒子．当Ｓｉ＜３０ａｔ％时，球磨产物主要是α－Ｆｅ（Ｓｉ）．随着Ｓｉ含量升高．Ｆｅ和Ｓｉ的化合物在球磨粉末中所占比例逐渐增大．实验结果表明．Ｆｅ－Ｓｉ粉末随球磨时间增加粒径减小，Ｆｅ６０Ｓｉ４０混合粉末经１２０ｈ球磨可得到粒径为７ｎｍ的晶粒．     

机械合金化方法制备Fe—Si纳米晶粒子的研究

用机械合金化（ＭＡ）方法制备了Ｆｅ１００＝ｘＳｉｘ（ｘ＝２０．３０，４０．７０）纳米粒子，当Ｓｉ＜３０ａｔ％时，球磨产物主要是ａ＝Ｆｅ（Ｓｉ），随着Ｓｉ含量升高，Ｆｅ和Ｓｉ的化合物在球磨粉末中所占比例逐渐增大，实验结果表明，Ｆｅ－Ｓｉ粉末随球磨时间增加粒径减小，Ｆｅ６０Ｓｉ混合粉末经１２０ｈ球磨可得到粒径为７ｎｍ的晶粒。     

铅铈和常用板栅合金在硫酸溶液中生长的阳极膜的比较

用伏安法研究在４．５ｍｏｌ．ｄｍ＾－３Ｈ２ＳＯ４溶液中的Ｐｂ－Ｃｅ（ｘ（Ｃｅ）＝１％）合金上生长的阳极膜,并与Ｐｂ－Ｓｂ（ｘ（Ｓｂ）＝７％）和Ｐｂ－Ｃａ－Ｓｎ（ｘ（Ｃａ）＝０．５％,ｘ（Ｓｎ）＝１．５）两常用板栅合金的作比较,实验结果表明,Ｐｂ－Ｃｅ合金上生长的α－ＰｂＯ２和Ｐｂ（ＩＩ）氧化物的生长速率均显著低于Ｐｂ－Ｃａ－Ｓｎ的,但高于Ｐｂ－Ｓｂ,也即Ｐｂ－Ｃｅ的耐腐蚀性优于Ｐｂ－Ｃａ－Ｓｎ,但     

图的周长

设Ｇ为ｎ阶２连通图，Ｄ（ｘ）＝（ｙ│ｙ∈Ｖ（Ｇ），ｄ（ｘ，ｙ）≤２），（ｄ１，ｄ２，．．．，ｄｊ，．．．，ｄ│Ｄ（ｘ）│为Ｄ（ｘ）中所有顶点的度排成的非减度序列ｄｄ（ｘ）为（ｄ１，ｄ２，．．．，ｄｊ，．．．ｄ│Ｄ（ｘ）│）中当ｊ＝ｄ（ｘ）时的度，δ０＝ｍｉｎ（ｍａｘ（ｄ（ｘ），ｄ（ｙ））ｘ，ｙ∈Ｖ（Ｇ），Ｄ（ｘ，ｙ）＝２），δｉ＝ｍｉｎ（ｄｄ（ｘ）│ｘ∈Ｄ（δｉ－１）│，Ｄ（δｉ－１）＝（ｘ│ｘ     

CdS0.1Se0.9半导体纳米晶体的生长和吸收光谱的研究

采用两步退火方法获得了嵌埋于玻璃基体内ＣｄＳｘＳｅ１－ｘ的纳米晶体,其平均尺寸随退火时间的增加而增大。从实验测量的室温吸收谱上看到,当纳米晶体的平均直径从５．６１ｎｍ减小到４．６９ｎｍ时,其吸收边高能方向移动了０．０８９ｅＶ。     

用MTGA法研究非晶合金的纳米晶化过程

用ＭＴＧＡ测量ＦｅＣｕＮｂＳｉＢ非晶样品的表观失重与温度关系σ－Ｔ和ｄσ／ｄＴ－Ｔ,发现非晶合金晶化过程可区分为５个不同阶段．研究经７５３～８８３℃等温退火１ｈ的样品发现,Ｔａ升高,析出的磁纳米晶体αＦｅＳｉ量增多,剩余非晶相的居里温度也升高．ＴＣ＝０．５２Ｔａ＋３６４．８,相关系数ｒ＝０．９８．用ＭＴＧＡ法测量αＦｅＳｉ或剩余非晶相的体积百分数随退火温度的变化     

真空炉冷非晶态合金钎料的微观组织

研究了真空熔化炉冷晶态及非晶态Ｎｉ（８０－ｘ）Ｃｒ１０Ｂ２．５Ｓｉ４．５Ｆｅ３Ｃｕｘ合金钎料真空熔化炉冷组织形态,分析了铜的添加对合金钎料组织的影响．研究结果表明：非晶态钎料真空熔化炉冷后与相应的晶态比较组织上无大的差异,仅仅是固溶体含量的增加及共晶相更弥散分布．     

图的升分解问题的两个新结果

Ａｌａｖｉ等人在１９８７年定义了图的一种新分解,即“升分解”（ＡｓｃｅｎｄｉｎｇＳｕｂｇｒａｐｈＤｅｃｏｍｐｏｓｉｔｉｏｎ）,并且猜想：任意有正数条边的图都可升分解．该文证明了下面两个新结果：（１）Ｈｉ是ｉ条边的Ｋｎ的子图,当ｎ＋１≤ｉ≤２ｎ－２ｎ／３［］２－２时,Ｇ＝Ｋｎ－Ｈｉ可升分解为Ｋ１,１,Ｋ１,２,…,Ｋ１,ｎ－５,Ｋ１,ｎ－４,Ｇｎ－３（ｎ≥６）,其中Ｋ１,ｎ－４Ｇｎ－３．（２）Ｈｉ是ｉ条边的Ｋｎ的子图,当ｉ≥２ｎ－２ｎ／３［］２时,Ｇ＝Ｋｎ－Ｈｉ不一定有定理１形式的升分解．     

中立型线性微分—差分方程的稳定性

应用Ｌｉａｐｕｎｏｖ泛函法研究了［ｘ（ｔ）－Σｋｉ＝１Ａｉｘ（ｔ－τｉ）］′＝－Ｂ０ｘ（ｔ）－Σｋｉ＝１Ｂｉｘ（ｔ－τｉ）中立型微分－差分方程的稳定性，其中ｘ∈Ｒｎ，Ｂ０，Ａｉ，Ｂｉ（ｉ＝１，２，…，ｋ）皆为ｎ×ｎ阶实常阵，τｉ∈（０，＋∞）（ｉ＝１，２，…，ｋ）．得到了该方程平衡态稳定性的几个充分判据     

一类线性方程可化为常系数方程的条件

ｎ阶线性方程ｄ＾ｎｙ／ｄｘ＾ｎ＋Ｐｎ－２（ｘ）ｄ＾ｎ－２ｙ／ｄｘ＾ｎ－２＋…＋Ｐ１（ｘ）ｄｙ／ｄｘ＋ｐ０（ｘ）ｙ＝０在变换ｘ＝φ（τ）下可化为常系数线性方程当且仅当Ｐｉ（ｘ）＝Ｓｉ／（Ｃ１ｘ＋Ｃ２）＾ｎ－ｉ（ｉ＝０，１，…，ｎ－２）。     

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