CVD金刚石薄膜微区孪晶的研究

采用扫描电镜观察了金刚石薄膜的表面组织形貌,使用电子背散射衍射(EBSD)技术检测了金刚石薄膜中的微区孪晶界分布.从晶体取向的角度研究了孪晶对金刚石薄膜微观织构影响的机理.结果表明,金刚石薄膜中存在大量孪晶,在薄膜生长过程中孪晶界比例逐渐增加.存在高阶孪晶转变现象,高频率孪晶会影响到薄膜的织构.     

氨化时间和膜厚对Si(Ⅲ)上AIN薄膜生长取向的影响

采用磁控溅射技术在Si（Ⅲ）衬底上沉积了Al膜，在高温炉中使之与氨气反应制备／AIN薄膜．利用X射线衍射、X射线光电子能谱、扫描电镜等研究了薄膜的结构、成分以及表面形貌．结果表明不同氨气作用时间会使薄膜表现出不同的择优生长取向，同时不同厚度的Al薄膜也会在氨气作用后生成不同择优生长取向的A1N薄膜．     

孪晶对CVD金刚石薄膜宏观织构组分的影响

采用X射线研究了CVD金刚石薄膜的织构,并采用扫描电镜观察了金刚石薄膜的表面组织形貌,探讨了孪晶对金刚石薄膜织构的影响.结果表明,高频率的孪晶会影响薄膜的织构,高频率孪晶导致没有形成{100}织构,而形成{122}织构.     

沉积厚度对L10-FePt薄膜(001)织构和磁性的影响

采用直流磁控溅射方法在表面氧化的Si(001)基片上制备不同厚度的FePt薄膜, 并利用原子力显微镜(AFM)、 X射线衍射(XRD)和振动样品磁强计(VSM)表征样品的形貌、结构和磁性. 结果表明: 将薄膜样品在H₂气氛中经600 ℃退火1 h, 得到了L1₀-FePt薄膜; 薄膜具有(001)织构或明显的(001)取向生长, 随着沉积厚度
的增加, FePt的晶粒尺寸变大, 样品的有序化程度增大, (001)取向生长呈减弱的趋势; 样品均具有明显的垂直磁各向异性, 随着薄膜厚度的增加, 平行膜面矫顽力增大, 垂直膜面矫顽力先增大后减小, 当沉积厚度为10 nm时, 样品的垂直磁各向异性最佳.     

低温生长纳米ZnO薄膜的结构

采用气体放电活化反应蒸发技术(GDARE),以玻璃为衬底,在较低的温度下沉积纳米ZnO薄膜,用二次蒸镀法克服薄膜生长饱和问题、有效增加膜厚及改善薄膜质量。讨论了GDARE法低温下沉积纳米ZnO薄膜的生长过程及成膜机理。由原子力显微镜(AFM)和X-射线衍射谱(XRD)分析薄膜表面形貌和晶体结构,研究结果表明,二次蒸镀法沉积的双层纳米ZnO薄膜具有更好的结晶质量及长期稳定性,薄膜沿C轴高度取向生长,内应力较小,晶粒尺寸均匀,平均粒径约35nm,表面粗糙度降低。     

预回复对08Al深冲钢板再结晶组织及织构的影响

利用X射线衍射技术(ODF分析)并结合光学显微镜和透射电子显微镜观察了本溪钢铁公司生产的08Al深冲钢板的织构和组织,研究了预回复对其再结晶织构及组织的影响·结果表明:预回复退火具有推迟冷轧08Al深冲钢板再结晶的作用,但并未改变08Al深冲钢板的再结晶形成机制·08Al深冲钢板在预回复下再结晶γ纤维织构增强的原因主要是由于预回复降低了形变储能,抑制了其他取向晶核的形成及长大,促进了再结晶γ取向晶粒的择优生长     

低碳冲压钢板桔皮缺陷的成因

利用扫描电镜(SEM)、X射线衍射(XRD)和电子背散射衍射(EBSD)技术,针对SPCD冷轧板冲压制品中的桔皮缺陷的成因进行分析,探讨了晶粒取向可能对桔皮产生的影响.结果表明:铁素体晶粒过度粗大是导致冲压件表面产生桔皮缺陷的根源;{111}织构强度较弱和较大冲压量是加剧桔皮产生的两个因素.桔皮自由表面由平缓区和粗糙区组成,两个区域均显现以{112}〈110〉与{111}〈110〉为主导的取向特征,表明表面形貌与晶粒取向的对应性不显著,表面接触状况不同是造成这种形貌差异的主要原因.     

ZnO薄膜的制备及其特性研究

采用射频磁控溅射技术生长出高质量（002）晶面取向的ZnO薄膜.通过XRD和AFM研究了射频功率和氧气比例对ZnO薄膜的结构和表面形貌的影响.研究结果显示,射频功率在50W下氧气比例为45%时,所生长的ZnO薄膜可以用于制作高质量的表面声波仪（SAW）.     

沉积温度对直流磁控溅射TiN薄膜结构和表面形貌的影响

利用直流磁控溅射技术,在锆合金基体表面上研究不同基体温度对沉积TiN薄膜的影响.分别采用X射线衍射仪和扫描电子显微镜(SEM)对TiN薄膜结构、表面形貌和截面形貌进行了研究.研究结果表明:TiN薄膜在不同沉积温度下晶格取向是不同的;200℃时,TiN为随机取向;300℃时,TiN薄膜以(111)为择优取向;400℃时,薄膜晶化质量不断提高,最后逐渐趋于稳定.300℃时,薄膜的致密性与均匀性较好,表面无明显缺陷.     

无模板电化学沉积生成附着一维针尖或二维薄膜结构的ZnO纳米柱阵列

采用无模板电化学沉积,以n型(100)硅片为衬底,生成ZnO纳米柱阵列,并在不同条件下进行二次生长,分别在纳米柱表面生成一维针尖与二维薄膜结构.通过场发射扫描电镜图片(FESEM)和x光散射谱(XRD)研究了二次生长机理.结果表明,电流密度高低控制Zn0二次生长形貌:大沉积电流在纳米柱表面生成沿c轴取向针尖;小电流则容易形成沿a轴取向薄膜结构.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with