一个Fe（Ⅲ）配合物的晶体结构及光物理性质

采用水热合成方法得到1个Fe（Ⅲ）配合物｛[Fe（phen）3][Fe（CN）6]·0．5phen ·5H2 O｝（phen ＝1,10‐菲啰啉）．通过红外光谱（IR）、紫外可见吸收光谱（UV‐Vis）、X射线粉末衍射（XRD）、X 射线单晶衍射和表面光电压谱（SPS）对其进行了表征和光物理性质测定．结构解析结果表明,标题配合物是1个以Fe（Ⅲ）为中心的离子型配合物,配阴、阳离子分别是[Fe（CN ）6]3‐和[Fe（phen）3]3＋．丰富而复杂的分子间氢键最终将分子连成了3D网状结构．采用表面光电压谱（SPS ）和场诱导表面光电压谱（FISPS ）探讨了配合物的表面光电性能．结果表明,它在紫外‐可见光（λ＝300～800 nm ）诱导下,呈现出明显的表面光伏响应,表明其具有一定的光‐电转换能力．同时对配合物的U V‐Vis吸收光谱和IR光谱进行了分析和指认．     

放电等离子烧结Nb/Nb5Si3原位复合材料

以Nb，Si粉末为原料，采用放电等离子烧结（SPS）技术，原位合成了密实的Nb／NbsSi3复合材料．利用扫描电镜（SEM）、电子探针微区分析（EPMA）和X射线衍射（XRD）等手段对材料的组织结构进行了分析，并探讨了材料的结构形成机理．结果表明，合成的材料由近球状的Nb颗粒与Nb-Nb5S3共晶组织组成；SPS过程中产生的放电等离子体使Si粉及Nb颗粒的表面熔化，熔融的Nb和Si在冷却过程中发生共晶反应而形成Nb-NbsSi3共晶体，而未反应完的Nb颗粒则均匀分布在共晶组织中．     

Fe@SiO2软磁复合材料的电子结构和磁性能

用化学沉淀法和粉末冶金方法制备Fe@SiO₂软磁复合材料,采用X射线衍射(XRD)、透射电镜(TEM)等方法和基于密度泛函理论(DFT)的第一性原理计算,研究材料的显微结构、电子结构和磁性能。研究结果表明：Fe@SiO₂软磁复合材料的涡流损耗Pe随SiO₂包覆量的增加而大幅度减小,当正硅酸乙酯(TEOS)的添加量为2 mL时,总损耗Ps为132.7 W/kg(20 mT和200 kHz时),最大磁导率μm为55,综合软磁性能最佳。Fe粉表面包覆着一层均匀、致密、完整的半透明SiO₂包覆层,包覆层与Fe基体之间结合紧密。Fe/SiO₂界面处Fe—O和Fe—Si共价键的形成使其具有良好的稳定性,其界面黏附功Wad约为1.18 J/m2。Fe—O共价键的形成归因于Fe 3d电子与O 2p电子在-4.7～-1.6 eV和-7.5～-6 eV的区间内的强杂化;Fe—Si共价键的形成主要归因于界面处Si 2s和Fe 3s电子在低能量区域-9.7～-8.8 eV杂化态的出现。该共价键的形成可...     

Al90Mn9Ce1／Al2O3复合材料综合性能研究

研究了通过放电等离子烧结（Spark Plasma Sintering,SPS）方法制备的Al90Mn9Ce1／Al2O3金属／陶瓷块体复合材料的抗氧化腐蚀性能和力学性能。结果表明,复合材料具有良好的抗氧化抗腐蚀性能以及较高的强度,强度氧化速率仅为0．016mg／h、腐蚀速率为3．2mg／h;抗压强度514MPa、显微硬度达到231．75HV。     

Fe2(Mo04)3/Si3N4复合粉末还原及热压微观组织结构分析

以α-Si3N4,Fe(NO3)3·9H2O和NH4Mo7O24·4H2O为原料,采用非均相沉淀法制备Fe2(M0O4)3/Si3N4复合粉末,采用氢气还原与热压法获得Fe-Mo/Si3N4复合粉末与烧结体,采用x线衍射仪(XRD)、电子能谱(EDS)、电镜扫描(SEM)和电镜透射(TEM)等方法对Fe-Mo/Si3N4复合粉末与烧结体物相、成分及微结构进行观察与分析.分析结果表明:Fe-Mo/Si3N4复合粉末主要成分为α-Si3N4,Mo,Si和Fe-Mo氮化物(Fe6M07N2和Fe3M03N),其中Mo颗粒长大;粒径为4-7 μm的Mo5Si3大颗粒均匀镶嵌在Si3N4,Fe-Mo氮化物(Fe6Mo7N2和Fe3Mo3N)及Si02的混合物组成的粒径为1 μm左右的小颗粒之中.     

含8-羟基喹啉侧基聚酯的合成、结构表征及荧光性能

以5‐硝基间苯二甲酸、5‐氯甲基‐8‐羟基喹啉盐酸盐等为主要原料，经多步反应合成了2种新型含8‐羟基喹啉侧基聚酯P5和P6．利用IR、UV‐Vis、1 H NMR、GPC和荧光光谱对相关化合物结构和性能进行表征．P5的重均分子量M w 、数均分子量M n和相对分子质量分布指数PDI为4416、3025 g／mol和1．46．P6的重均分子量Mw 、数均分子量Mn和相对分子质量分布指数PDI为7661、5040 g／mol和1．52．P5和P6的紫外光谱表明，二者的吸收峰位于266、328 nm处，分别归属于苯环的π‐π倡跃迁吸收峰和喹啉环的π‐π倡跃迁吸收峰．溶解性测试表明，P5和P6易溶于DMAc、DMF、DMSO和NMP ，部分溶于THF和CHCl3．P5和P6的DMF溶液（5×10－5 mol／L）以362 nm波长光激发，分别在432、433 nm处出现最大发射峰，发射紫色荧光．     

SiC颗粒表面改性对SiCp/Fe烧结及性能的影响

文章通过试验初步探讨了SiC颗粒表面改性对SiCp／Fe复合材料的烧结机制、机械性能及断裂情况的影响．研究表明,在碳化硅复合材料表面化学镀一层镍,能够较好地改善增强体与基体的界面结合,使得碳化硅复合材料的抗弯强度、冲击韧性及宏观硬度均有了明显的提高．     

锂离子电池SnO2-Si／C负极材料的电化学性能

利用水热法合成了SnO2-si／c复合材料,利用X射线衍射（XRD）和扫描电子显微镜（SEM）分析了材料的物相和电极的微结构,结果表明,合成的复合材料中SnO2颗粒平均尺寸为5．3nm,碳的加入抑制了活性中心Si和SnO2在循环过程中较大的结构变化,且SnO2和Si颗粒均匀地分散在碳的网络结构中,增加了复合材料的电接触...     

新疆柯柯亚一带晚石炭世硅质岩成因分析

新疆柯柯亚一带晚石炭世硅质岩分布极为广泛,通过野外地质填图及矿产调查过程中的详细观察和硅质岩岩石学特征分析,并根据硅质岩具有低SiO2、K2O、P2O5及HREE;高Al2O5、FeO、MgO、K2O＋Na2O、TiO2、∑EEE;SiO2／Al2O3、SiO2／（Na2O＋K2O）值分别为11～25和37～74;Fe／Ti值小于20、（Fe＋Mn）／Ti值小于15、Si／（Si＋Al＋Fe）值小于0．9等特征,认为这些硅质岩为火山成因。而且Th／Sc、Th／U和δCe等值及稀土配分曲线和TiO2-Al2O3图解也明确指示了硅质岩属火山成因类型。     

原位反应TiC颗粒对喷射沉积Al-20Si-5Fe合金微观组织的影响

利用熔铸－原位反应喷射沉积成形技术制备了TiC颗粒增强Al-20Si-5Fe复合材料,分析了内生TiC颗粒对喷射沉积Al-20Si-5Fe合金微观组织的影响。结果表明：喷射沉积Al-20Si-5Fe合金微观组织中常出现脆性、针状的Al-Si-Fe三元金属间化合物相,在Al-20Si-5Fe合金中内生一定量的TiC颗粒,有助于减小粗晶Si颗粒的尺寸、消除针状的Al-Si-Fe三元金属间化合物相。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the