电弧法制备了Fe—C合金超微粒的分析

用电弧法制备了以Ｆｅ和Ｃ为原材料的超微粒,通过Ｘ射线衍射,Ｘ射线光电子能谱,电子显微镜和电子衍射观测和分析了样品的形态,结构和成分,并与以Ｆｅ为原材料制备的微粒进行了对比分析,结果表明,用电弧法能够制备出含有ＦｅｘＣ１－ｘ相的合金超微粒,较Ｆｅ超微粒而言,含ＦｅｘＣ１－ｘ相的合金超微粒抗氧化能力有所增强。     

Nd1—xCaxFeO3—y的X射线衍射结构分析

本文介绍了钙钛矿型氧化物Ｎｄ１－ｘＣａｘＦｅＯ３－ｙ的制备和Ｘ射线衍射结构分析。Ｘ射线结构分析结果表明，Ｎｄ１－ｘＣａｘＦｅＯ３－ｙ的晶格常数和晶胞体积均随ｘ增加而近似呈线性减小。     

Co含量对Fe1—xCox—SiO2纳米合金颗粒体晶体结构和磁性的…

利用溶胶法制备了Ｆｅ１－ｘＣｏｘ－ＳｉＯ２纳米颗粒体材料，并首次利用Ｘ射线衍射仪，透射电子显微镜和振动样品磁强计研究了这种材料中Ｃｏ含量对晶体结构和磁性的影响。结果表明，样品中Ｆｅ－Ｃｏ合金微粒的晶体结构与Ｃｏ含量的关系和大块Ｆｅ－Ｃｏ合金相似；合金微粒的比饱和磁化强度σｓ随Ｃｏ含量的变化规律与粉状纯Ｆｅ－Ｃｏ合金相似。     

铬含量对铁铬纳米粒状合金材料磁学性质的影响

用溶胶法制备出了（Ｆｅ１－ｘＣｒｘ）１５（ＳｉＯ２）８５粒状合金固体,这种粒状合金固体是一种纳米复合材料,由嵌在ＳｉＯ２母体中的ＦｅＣｒ合金颗粒构成．本文报告这种材料的基本制备方法,以及Ｃｒ含量对ＦｅＣｒ合金颗粒磁学性质的影响     

Fe－C马氏体室温时效转变的研究I─有序化

利用透射电镜对Ｆｅ－１．８３Ｃ马氏体室温时效所产生的有序化进行了详细的研究。结果表明：铁碳马氏体的有序相有两种，一种是具有Ｆｅ４Ｎ结构的普通有序相γ＇－ＦｅｘＣ（１），另一种是由它衍生出来的长周期有序相，称为γ－ＦｅｘＣ（Ⅱ），ｘ＝４～１０．两种有序相同时存在于马氏体的时效组织中．经研究确定的有序相晶体结构可以解释所有的实验衍射结果．     

Fe1—xNix合金超继微粒的磁性及穆斯堡尔谱研究

气相蒸发法制备的Ｆｅ１－ｘＮｉｘ合金超细微粒，平均粒径约为２０ｎｍ。利用振动样品磁强计、ｘ射线衍射分析仪以及穆斯堡尔谱仪分析了样品的磁性、相组成随ｘ的变化关系。     

快淬NdFeB永磁合金的晶化行为

采用动态差示扫描量热法（ Ｄ Ｓ Ｃ） 和 Ｘ 射线衍射法（ Ｘ Ｒ Ｄ） 研究了快淬 Ｎｄ Ｆｅ Ｂ合金的晶化行为。非晶态 Ｎｄ８ ．５ Ｆｅ８６ Ｂ５ ．５ 合晶化由三个过程组成,各转变有效晶化激活能分别为４ ．８ｅ Ｖ、１５ ．２ｅ Ｖ 和５ ．４ｅ Ｖ。非晶态 Ｎｄ７ ．５ Ｄｙ１ Ｆｅ８５ Ｂ４５ Ｇａ２ 合金直接由非晶态转变为α－ Ｆｅ和 Ｎｄ２ Ｆｅ１４ Ｂ 相,有效晶化激活能为５ ．８ｅ Ｖ。     

激光气相法制备Fe／N超微粒子

采用激光气相法制备出了Ｆｅ／Ｎ，Ｆｅ／Ｎ／Ｃ超微粒子．用Ｘ－射线衍射、透射电镜和红外光谱研究了样品的特性．     

Fe—C马氏体室温时效转变的研究I—有序化

利用透射电镜对Ｆｅ－１．８３Ｃ马氏体室温时效所产生的有序化进行了详细的研究。结果表明：铁碳马氏体的有序相有两种，一种是具有Ｆｅ４Ｎ结构的普通有序相γ＇－ＦｅｘＣ（Ｉ），另一种是由它衍生出来的长周期有序相，称为γ＇－ＦｅｘＣ（ＩＩ），ｘ＝４－１０，两种有序相同时存在于马氏体的时效组织中，经研究确定的有序相晶体结构可以解释所有的实验衍射结果。     

铬含量对铁铬钠米粒状合金材料磁学性质的影响

用交法制备出了（Ｆｅ１－ｘＣｒｘ）１５－（ＳｉＯ２）８５闰状合金固体,这种粒状合金固体是一种钠米复合材料,由嵌在ＳｉＯ２母体中的Ｆｅ－Ｃｒ合金颗粒构成。本文报告这种材料的基本制备方法,以及Ｃｒ含量对Ｆｅ－Ｃｒ合金颗粒磁学性质的影响。     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-