原电池沉积技术工艺条件对SrMoO4薄膜结构与形貌的影响

室温下,在Sr(OH)2溶液中采用原电池方法直接制备了高晶态SrMoO4薄膜.通过XRD和SEM技术系统探讨了反应时间、溶液pH值和外加氧化剂等工艺条件对制备的SrMoO4薄膜的结晶性和表面形貌的影响.结果表明,电化学反应时间、溶液pH值和外加氧化剂对SrMoO4薄膜的晶体结构和表面形貌具有重要的影响:随着反应时间的增加,薄膜的结晶性和形貌会改善;在较高的溶液pH值条件下,SrMoO4晶粒沿c轴择优生长;当加入适量的过氧化氢氧化剂时,可加快SrMoO4晶粒的生长,但会产生团聚现象.     

不同形貌SrMoO_4材料的制备及光致发光性质

通过微乳液法及溶剂热法合成出了不同形貌的SrMoO4材料,探讨了不同反应条件对SrMoO4材料形貌的影响。微乳液体系中十六烷基三甲基溴化铵的浓度、反应物浓度及反应时间都会对SrMoO4材料的形貌造成影响。SrMoO4样品的室温光致发光谱是由发光中心在约455 nm处的紫外—可见光组成,并且样品的形貌不同发光强度和发光峰位置略有不同。     

微波水热法合成Eu3+掺杂的SrMoO4红色荧光粉

采用微波水热的方法在中性水溶液中合成平均长6μm、中间宽4μm的梭子形SrMoO4基体材料,并研究反应物浓度和Eu3+的掺杂量(摩尔分数3.75%～30%)及EG/H2O体积比等条件对合成的SrMoO4粉体形貌的影响。结果表明:随着Eu3+浓度的增加,形貌向片状结构转变。另外,在掺杂7.5%Eu3+时,采用加入乙二醇(EG)的方法,抑制了片状结构的生成。随着EG比例的增加,颗粒分布趋向均匀,粒径逐渐变小。当EG与H2O体积比为4∶1时,得到了分布均匀、长约0.8μm的梭子状SrMoO4∶Eu3+粉体。荧光光谱分析结果表明,梭子状SrMoO4∶Eu3+(7.5%)粉体能够被近紫外(395 nm)或者蓝光(463 nm)有效地激发,从而发射波长为614 nm的红光。     

制备工艺条件对纳米Ti_(1-x)S_xO_2薄膜光催化活性的影响

以硫脲为S的源物质,以钛酸丁酯为TiO2的前驱体,以蜂窝陶瓷为载体,采用改进的溶胶-凝胶-浸渍提拉法制备Ti1-xSxO2薄膜,探讨热处理温度、S掺杂量及涂膜等工艺条件对Ti1-xSxO2薄膜的光催化活性的影响。研究结果表明：掺硫TiO2光催化剂在可见光区的吸收强度增大;采用溶胶-凝胶-浸渍提拉法制备Ti1-xSxO2光催化剂的最佳工艺条件是：硫脲与Ti（OBu）4摩尔比为3：1,煅烧温度为600℃,涂膜层数为6。在最佳工艺条件下制备的Ti1-xSxO2纳米薄膜对亚甲基蓝的降解率可达100％。     

SrMoO4的电子结构和光学特性

用第一性原理对SrMoO4化合物第一次进行了电子结构与光学性质的理论研究．发现SrMoO4有一个3．59eV直接带隙．Mo原子的d轨道和O原子的p轨道之间的杂化形成了SrMoO4^2-阴离子．基于电子能带结构对介电函数的虚部进行了解释，并对SrMoO4的反射系数、吸收系数、能量损失系数、折射系数和湮灭系数等光学性质进行了研究．     

电化学沉积CaWO4薄膜及表征

在室温条件下，采用恒电流电化学沉积技术直接在钨片基体上制备了白钨矿结构的CaWCId晶态薄膜。电化学反应的工艺参数为：电流密度为1mA／cm^2、电解液的pH值为13．0、电化学处理时间为1．5h。采用XP,D、XPS、SEM技术分析了制备的CAWO4薄膜的晶相、化学组成和表面形貌，所制备的薄膜是表面均匀致密的四方晶系的单相薄膜。     

阳极氧化法制备Ba1-x-yCaxSryMoO4固溶体薄膜

室温条件下,在碱性的Ca^2＋、Sr^2＋、Ba^2＋溶液中,通过电化学阳极氧化制备了Ba1-x-yCaxSryMoO4多晶固溶体薄膜材料.采用XRD、SEM、XPS、FA（荧光分析）等测试手段分析了薄膜的晶相结构、表面形貌、化学组成及室温光致发光特性.研究表明室温阳极氧化法所制备的Ba1-x-yCaxSryMoO4固溶体薄膜具有四方晶结构,在紫外光的激发下,有较好的光致发光特性.     

氧分压对IWO薄膜表面形貌及光电性能的影响

掺钨氧化铟(In2O3:W,IWO)薄膜是一种新型的透明导电氧化物(TCO)薄膜,其中W与In之间存在着较高的价态差,使得IWO薄膜与其他TCO薄膜相比,在相同的电阻率条件下具有载流子浓度低、迁移率高和近红外区透射率高的特点.利用直流磁控溅射法制备了IWO薄膜,利用X射线衍射、扫描电子显微镜、霍尔效应及分光光度计表征了薄膜的表面形貌及光电性能.在工作压力1 Pa、氧分压为2.4×10-1Pa的条件下,实验中制备的IWO薄膜最佳电阻率为6.3×10-4Ω.cm,最高载流子迁移率为34 cm2V-1s-1,载流子浓度达到2.9×1020cm-3,可见光平均透射率约为85%,近红外平均透射率大于80%.     

射频溅射金属前驱体硫化法制备的Cu_2ZnSnS_4薄膜(英文)

采用射频溅射技术沉积Cu/Sn/Zn金属前驱体叠层结合硫化技术在玻璃衬底上成功制备了Cu2ZnSnS4薄膜。X-射线衍射分析表明,通过优化制备条件可以获得单一黝锡矿结构且具有(221)择优取向的Cu2ZnSnS4薄膜。霍尔效应和紫外可见透过谱测量表明,样品的薄膜电阻、吸收系数和光学带隙分别达到0.073Ω.cm,104cm-1和1.53eV,具有适合作为薄膜太阳电池吸收层应用的可能性。     

光照溶胶及基片对TiO2薄膜光催化性能的影响

用紫外光照射TiO2溶胶,以玻璃和铝片为载体,制备了光助TiO2薄膜,同时制备了非光助薄膜,通过降解4BS染料废水和工业印染废水,考察了薄膜的光催化活性.结果表明,光助薄膜的光催化活性明显提高,尤其是光助玻璃薄膜;基片的种类对薄膜的催化能力有很大的影响.本实验为优化选择基片及控制溶胶条件,制备高活性光催化剂及降低废水处理成本提供了有价值的参考.     

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