乙酰胺-尿素-NaBr熔体中Nd-Ni合金的电化学制备

在353K的乙酰胺-尿素-NaBr熔体中,Ni（Ⅱ）一步不可逆还原为金属Ni,Nd（Ⅲ）不能单独还原为Nd,但可以被Ni（Ⅱ）诱导而共沉积.由恒电位电解法得到非晶态的Nd-Ni合金,Nd的含量随阴极电位的负移,Nd（Ⅲ）/Ni（Ⅱ）摩尔比增大及电解时间延长而增大.     

乙酰胺-尿素-NaBr熔体中Eu-Ni合金的电化学制备

利用循环伏安法,研究在353K的乙酰胺-尿素-NaBr熔体中,Ni（Ⅱ）一步不可逆还原为金属Ni,Eu（Ⅲ）不能单独还原为Eu,但可以被Ni（Ⅱ）诱导而共沉积.由恒电位电解法得到Eu-Ni合金,Eu的含量随阴极电位的负移,Eu（Ⅲ）/Ni（Ⅱ）摩尔比增大及电解时间延长而增大.     

乙酰胺-尿素-NaBr熔体中Sm-Co合金的电化学制备

利用循环伏安法,研究在353K的乙酰胺-尿素-NaBr熔体中,Co(Ⅱ)还原为金属Co是一步不可逆过程,Sm(Ⅲ)不能单独还原为Sm,但可以被Co(Ⅱ)诱导而共沉积.由恒电位电解法得到非晶态的Sm-Co合金,Sm的含量随阴极电位的负移,Sm(Ⅲ)/Co(Ⅱ)摩尔比增大而增大.     

乙酰胺-尿素-NaBr熔体中Dy-Co合金的电化学制备

在353 K的乙酰胺-尿素-NaBr熔体中,Co(Ⅱ)一步不可逆还原为金属Co,测得α=0.29和D0=6.28×10-5cm2.s-1,Dy(Ⅲ)不能单独还原为金属Dy,但可以被Co(Ⅱ)诱导而共沉积.由恒电位电解法得到非晶态的Dy-Co合金,Dy的含量随阴极电位的负移,Dy(Ⅲ)/Co(Ⅱ)摩尔比增大及电解时间延长而增大.Dy的最大含量可达93.94%.     

乙酰胺-尿素-NaBr熔体中Tb-Ni薄膜合金的制备

在 35 3K的乙酰胺_尿素_NaBr熔体中 ,Ni(Ⅱ )一步不可逆还原为Ni,测得α为 0 18和D为 1.44× 10 - 6cm2 ·s- 1 。Tb(Ⅲ )不能单独还原为Tb ,但是可以被Ni(Ⅱ )诱导共沉积。由恒电势电解法得到非晶态的Tb_Ni合金膜。铽的质量分数随着阴极电势的负移和Tb(Ⅲ ) Ni(Ⅱ )摩尔比增大而增大。铽的质量分数可达 84.32 %     

乙酰胺-尿素-NaBr熔体中Nd-Co合金的电化学制备

在353 K的乙酰胺-尿素-NaBr熔体中,Co（Ⅱ）一步不可逆还原为金属Co,Nd（Ⅲ）不能单独还原为Nd,但可以被Co（Ⅱ）诱导而共沉积.由恒电位电解法得到非晶态的Nd-Co合金,Nd的含量随阴极电位的负移、Nd（Ⅲ）/Co（Ⅱ）摩尔比增大及电解时间延长而增大.     

乙酰胺-尿素-NaBr熔体中电沉积Mg-Ni合金的研究

在353K的乙酰胺-尿素-NaBr熔体中,Ni（II）一步不可逆还原为金属Ni,测得α为0.212和D0为1.49×10-8cm2？s-1;Mg（II）不能单独被还原为Mg,但是可以被Ni（II）诱导共沉积。由恒电位电解法得到非晶态的Mg-Ni合金膜,合金中Mg的含量随着阴极电位的负移和n（Mg（II））/n（Ni（II））摩尔比增大而增大.镁的最大质量分数可达28.73wt%。     

银（Ⅰ）对铈（Ⅲ）和钴（Ⅱ）阳极氧化的电催化

电位扫描和电解实验证明,铂电极上Ag~+离子在硝酸介质中对Ce(Ⅲ)和在硫酸介质对Co(Ⅱ)的阳极氧化都有明显的电催化作用,对于Ag~+-Ce(Ⅲ)系统,当[Ag~+]:[Ce(Ⅲ)]=1:10时,反应受扩散控制,而当[Ag~+]:[Ce(Ⅱ)]=1:100,则表现为均相化学反应控制.对该系统提出了可能的反应机理,并估计了其中均相化学反应的速度常数.二相电解实验表明,银离子的存在可使蒽或苯甲醇电解氧化的电流效率明显增加.     

低温熔盐中Ni(Ⅱ)、Co(Ⅱ)诱导稀土共沉积的电化学行为

在353K的乙酰胺-尿素-NaBr熔体中,利用循环伏安法,研究了Pt、Cu电极上,Ni(Ⅱ)和Co(Ⅱ)的电还原为金属是一步完全不可逆反应,测得乙酰胺-尿素-NaBr中,Ni(Ⅱ)在Pt上,传递系数α=0.27,扩散系数D0=6.51×10-5cm2.s-1,Cu上α=0.26,D0=6.02×10-7cm2.s-1.Co(Ⅱ)在Pt上,传递系数α=0.28,扩散系数D0=4.68×10-5cm2.s-1,Cu上α=0.28,D0=4.06×10-7cm2.s-1.上述熔体中,稀土RE(Ⅲ)不能单独还原为RE(0),但可以被Ni(Ⅱ)和Co(Ⅱ)诱导共沉积,合金膜由X-射线能谱(EDS)证实.     

还原羰基化Pd-Phen催化剂体系中Ce(SO_4)_2的助催作用

Ce(SO_4)_2和V_2O_作为氧化性的助催化剂在硝基苯还原羰基地为苯氨基甲酸酯反应中能显著提高PdCl_2-邻菲咯啉(phen)体系的催化活性,应用LR,UV,循环伏安法和XPS测试结果表明Ce(SO_4)_2与Ptren容易生成配合物,Ce(Ⅳ)的作用在于维持Pd(Ⅱ)的氧化态,而Ce(Ⅲ)可能有助于硝基苯的脱氧。     

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