阴极共沉积Ni(OH)2薄膜在碱溶液中的电化学特性

采用阴极电沉积法在镍基底上制备Ni(OH) 2 薄膜 ,循环伏安法在 1 0mol·dm-3 KOH溶液中测量了薄膜电极的催化析氧特性 .沉积Ni(OH) 2 的薄膜电极比镍基底增加了 2 0mA·cm-2 的析氧电流 (1 0VvsHg/HgO电极 ) .在制膜过程中掺杂 7?(V/V)得到的复合氢氧化镍薄膜电极在碱溶液中的析氧电流又增加了约 2 0mA·cm-2 .分光光度法和薄层扫描分析法对薄膜进行了成分分析 .     

La0.9Sr0.1Ga0.8Mg0.2O3-α在常压合成氨及燃料电池中的应用

首次以La0.9Sr0.1Ga0.8Mg0.2O3-α陶瓷样品为固体电解质,成功地进行了常压合成氨试验,氨气的最高产率达到1.87×10-9mol·s-1·cm-2,氢气的转化率为60%以上;还研究了该样品的氢-空气燃料电池输出性能,900℃时的最大输出电流密度为510 mA·cm-2,最大输出功率密度为140 mW·cm-2,具有良好的燃料电池输出性能.     

抗菌肽SK66的生物信息学分析

从数据库中检索出CG13551基因氨基酸序列信息,生理生化分析显示:SK66蛋白含有107个氨基酸残基,分子量约11 948.3 Da,理论等电点为8.96.该蛋白中,甘氨酸(Gly)含量最高,为14.0％;其次为谷氨酸(Glu)和丙氨酸(Ala),分别为11.2％和9.3％.SK66蛋白是一个亲水蛋白质但不是一个分泌...     

One-step electrochemical reduction of stibnite concentrate in molten borax

In this study, antimony production from a stibnite concentrate (Sb₂S₃) was performed in one step using a molten salt electrolysis method and borax as an electrolyte. Electrochemical reduction of the stibnite concentrate was performed at 800℃ under galvanostatic conditions and explained in detail by the reactions and intermediate compounds formed in the borax. The effects of current density (100-800 mA·cm-2) and electrolysis time (10-40 min) on cathodic current efficiency and antimony yields were systematically investigated. During the highest current efficiency, which was obtained at 600 mA·cm-2, direct metal production was possible with 62% cathodic current efficiency and approximately 6 kWh/kg energy consumption. At the end of the 40-min electrolysis duration at 600 mA·cm-2 current density, antimony reduction reached 30.7 g and 99% of the antimony fed to the cell was obtained as metal.     

新西兰兔灌胃决明子后吸收入血的氨基酸分析

用高速氨基酸分析仪分析决明子的氨基酸含量及其灌胃(1g·kg-1)前后0、2、4h新西兰兔血清中游离氨基酸的浓度.结果显示,决明子中已测的17种氨基酸,只有5种吸收入血;除谷氨酸与精氨酸外,吸收入血的其他氨基酸与决明子中含量较高的氨基酸并无对应关系.     

水解法提取羽毛食用蛋白

家禽羽毛包括鸡毛、鸭毛、鹅毛、鹌鹑等鸟类羽毛。经测定,含有17种氨基酸,其中含量最多的是丝氨酸,约占14％;含量达7％以上的依次有,谷氨酸、甘氨酸、白氨酸、缬氨酸及精氨酸;含量在4～7％范围内的氨基酸依次为:异     

甲酸、甲醛、甲醇在铂微粒修饰聚苯胺电极上的氧化行为

采用循环伏安法研究PAN(Pt)电极在不同pH值、不同浓度的甲酸溶液中对甲酸的电催化氧化性能 .并考察了PAN(Pt)对甲酸、甲醛和甲醇的电催化氧化行为 ,发现PAN(Pt)电极对三者均有较高的电催化氧化活性 .它们的CV正向扫描峰值电位分别为 0 .2 8V、0 .75V、0 .70V ,峰值电流密度分别为 330 .4、878.6、735.7mA·cm- 2 .PAN(Pt)电极对甲酸电催化氧化体系的 pH值控制在 0 .7左右为宜 .在 0 .0 1～ 1.0mol·L- 1的甲酸浓度范围内 ,可用PAN(Pt)电极作传感器定量检测甲酸浓度 .     

单室无隔膜电解槽中恒电流电解合成丁二酸的研究

旨在寻找和研制电还原顺丁烯二酸制备丁二酸中高活性、高选择性的电极材料,采用自行研制的不锈钢(Stainlesssteel,SS)载表面合金电催化材料(Surface alloy/SS)作为工作电极,利用CV研究了其在常温常压、不同电流密度和支持电解质等条件下顺丁烯二酸电合成丁二酸中的性能,通过离子色谱电导检测等技术对电合成产物进行检测分析.结果表明:Surface alloy/SS电极对顺丁烯二酸的加氢还原表现出很高的电催化活性;对产物丁二酸的选择性高;优化的电解条件为:电流密度27.68 mA·cm-2,0.1 mol·L-1硫酸作为支持电解质.     

南方鲇延髓面叶氨基酸类神经递质含量研究

利用反相高效液相色谱洗脱,高丝氨酸作为内标,邻苯二甲醛柱前衍生和荧光检测器检测南方鲇延髓面叶4种氨基酸类神经递质天冬氨酸(Asp)、谷氨酸(Glu)、甘氨酸(Gly)和γ-氨基丁酸(GABA)的含量.结果表明,4种氨基酸在40 min内洗脱完全,分离效果良好;氨基酸浓度与峰面积比值呈良好的线性关系,其相关系数不低于0.999 2.该方法简便、特异性强、重复性好,适用于南方鲇延髓面叶氨基酸类神经递质的含量测定.     

中蜂(Apisindica)王浆氨基酸的定性滤紙层析初步研究

1.本文概述了王浆的化学成分,营养价值、医疗性能以及中蜂王浆的生产过程。 2.应用新华定性层析沪紙作紙上层析,初步鑑定了中蜂王浆蛋白貭的氨基酸組成有門冬氨酸,谷氨酸,賴氨酸,精氨酸,組氨酸,甘氨酸,絲氨酸,苏氨酸,丙氨酸,酪氨酸,甲硫氨酸,缬氨酸,色氨酸,异亮氨酸,亮氨酸,苯丙氨酸,脯氨酸,胱氨酸共18种。     

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