尖晶石结构ZnLiFeO4材料导电特性的研究

用固相反法制备ＺｎＬｉＦｅＯ４导电陶瓷材料，研究烧结工艺，Ｌｉ的添加量对导电陶瓷材料导电特性的影响，在氮气氛下１４００℃烧结，可获得电导率为９×１０＾－３Ω．ｃｍ尖晶石结构的导电陶瓷材料。     

Al2O3-WO3二元系线性热敏材料研究

利用激光烧结工艺合成了Ａｌ２Ｏ３－ＷＯ３系列ＮＴＣ热敏陶瓷材料．研究发现,这种陶瓷材料在一定的组分范围和工艺条件下,在较宽的温区内,其阻温特性呈现良好的线性关系．Ｘ－ｒａｙ衍射分析表明,经激光烧结的ＮＴＣ热敏材料中含有Ａｌ２Ｏ３,Ａｌ２（ＷＯ４）３和ＡｌｘＷＯ３相,且此材料中的导电相为钨青铜结构的ＡｌｘＷＯ３．ＡｌｘＷＯ３相是在Ａｌ２Ｏ３－ＷＯ３二元系平衡相图中所没有的．     

三点弯曲法测试微波烧结氧化锆陶瓷的断裂韧性值KIC^＊

本文采用三点弯曲法测量了微波烧结氧化锆陶瓷的断裂韧性，并与压痕法的测量做了比较．同时也比较了微波烧结与常规烧结陶瓷材料的性能．     

氮化硅陶瓷添加剂和制备工艺的研究进展

随着对氮化硅陶瓷研究的不断深入,其热学性能、介电性能有了极大的改善,使之可应用在电子器件等领域。总结了制备氮化硅陶瓷材料所使用的烧结助剂,包括氧化物烧结助剂、非氧化物烧结助剂和其他烧结助剂;比较了氮化硅陶瓷材料的烧结方式,包括热压烧结、气压烧结、放电等离子烧结、无压烧结和反应烧结;论述了与氮化硅相关的复合材料的研究进展;展望了氮化硅陶瓷材料研究的发展趋势。     

陶瓷材料液相烧结的传质机理及影响因素

一、液相烧结理论概况烧结过程理论是陶瓷材料科学中的一个重要基础理论课题。探明烧结机理及其影响因素对进行陶瓷材料的性能设计具有重要意义。当前,陶瓷材料的烧结理论还处于发展阶段,各种实验工作和理论分析不断地提出来。在陶瓷材料烧结过程中常常之伴随着一定组成的液相生成,因而研究液相参加的烧结过程具有重要意义。     

微波在陶瓷加工中的应用

介绍了陶瓷的传统烧结方法、微波技术、微波与陶瓷材料之间相互作用的特点;分析了近年来微波在陶瓷材料的制备、加工及修复等方面的研究成果及进展;着重探讨了微波烧结的特点和机理,微波在陶瓷材料的烧结,陶瓷涂层技术,微裂纹愈合等方面的应用.     

碳化硅、氧化锆增韧氧化铝复相陶瓷的研究

在纳米氧铝粉中加入碳化硅晶须和纳米氧化铝粉，通过烧结得到细晶的氧化铝基复相陶瓷，达到了提高氧化铝陶瓷断裂韧性的目的．研究了Ｎａｎｏ－Ａｌ２Ｏ３／ＳｉＣ（ｗ）、ＺｒＯ２复相陶瓷的烧结温度、晶粒尺寸、ＳｉＣ（ｗ）含量等对细晶Ａｌ２Ｏ３基复相陶瓷材料断裂韧性的影响．采用纳米Ａｌ２Ｏ３粉，可使烧结温度大幅度下降，在１６００℃即可得到致密的细晶陶瓷材料．ＳｉＣ（ｗ）质量分数ｗ为１８％时可以得到较高的断裂韧性值，ＫＩＣ＝６．９６ＭＰａ·ｍ１／２．晶须增韧的机理仍然是晶须的拔出和断裂．加入ＺｒＯ２后，利用ＺｒＯ２的相变增韧的效果，可以使Ａｌ２Ｏ３基陶瓷材料的断裂韧性进一步提高．     

粉煤灰提纯莫来石制备的陶瓷材料组织及性能

 利用粉煤灰提纯莫来石制备陶瓷材料,不仅可以降低生产成本,也可以减少粉煤灰堆积带来的环境危害。以不同化学成分的粉煤灰提纯莫来石粉为原料,通过球磨、压制、烧结制得陶瓷材料。探讨了烧结温度、成分对莫来石微晶陶瓷材料的体收缩率、烧失率、表观密度、冲击韧性、显微硬度的影响,分析了所制备陶瓷材料的显微结构特点。研究表明,在1450℃下进行烧结,制得的莫来石陶瓷材料最致密,体收缩率、显微硬度最大;S 型样品制得的试样致密度更高,综合性能较好;S 型中氧化钙含量多,降低了莫来石陶瓷材料的冲击韧性。     

烧成制度对MgO-TiO2-CaO微波介质陶瓷介电性能的影响

以钛酸镁为基础的陶瓷材料,是一种有潜力的微波介质陶瓷材料。文中研究了烧成制度（烧结温度（Ts）及预烧温度）对NgO—TiO2-CaO系统介电性能的影响。研究发现,烧结温度和预烧温度过高或过低都不利于系统介电性能的优化,只有在烧结温度和预烧温度适中时才可能得到性能优良的陶瓷材料。     

微波加热技术的应用--微波烧结陶瓷材料

文章介绍了微波加热技术中的微波烧结陶瓷材料的应用历史,分析了陶瓷材料微波烧结技术的主要优点、工艺特点、设备、进展,指出了应用中存在的一些亟待解决的问题.     

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