对14.9MeV中子核反应产生的反冲核能谱的测量

测量了由１４ ．９ Ｍｅ Ｖ 中子入射金属产生的反冲核的能谱．用活化技术测量溅射产额随靶与收集器之间距离的变化,用统一的原子阻止本领公式来计算溅射粒子在空气中的能量损失．溅射粒子的能量分布可由不同距离的溅射产额和能量损失导出．用这种方法第一次测量了 Ｍｇ 、 Ａｌ 、 Ｃｒ 、 Ｆｅ 、 Ｃｏ 、 Ｎｂ 和３１６ 型不锈钢等７ 种样品的８ 种核反应所产生的反冲核的能谱     

磁控靶溅射刻蚀的模拟研究

建立了磁控溅射单粒子模型，结合靶表面磁场的分布，用ＭｏｎｔｅＣａｒｌｏ方法研究了溅射气体粒子的运动规律，得到靶表面刻蚀的图形，发现靶中间圆环的刻蚀最强，这与实验结果和磁场的水平分量分布一致．     

蒙特卡罗模拟单元素靶的溅射产额角分布

用蒙特卡罗方法模拟能量为２７ｋｅＶＡｒ＋轰击Ａｇ和Ｃｄ单元素靶的力学运动，以研究级联碰撞产生的溅射原子的空间分布情况，对计算结果进行适当的数学处理，以得出微分溅射产额角分布．计算结果和实验值作了比较，并讨论了两种单元素靶的微分产额角分布．     

Co、 Al共掺杂ZnO靶材溅射过程中离子与固体相互作用的模拟

根据随机碰撞过程中的级联碰撞原理,跟踪载能粒子在固体内的慢化过程,选用SRIM2008软件模拟了Co、Al共掺杂ZnO靶材在溅射过程中离子与固体相互作用.研究了溅射过程原子的选择性溅射现象,溅射原子的能量、角度分布情况,得出ZnO基靶材溅射过程中离子与固体相互作用的规律.欲获得成分接近Zn0.85Co0.1Al0.05O的薄膜,最佳的溅射工艺条件为:Ar+离子以68°的角度入射,靶材成分采用Zn0.7Co0.23Al0.07O.     

空磁控靶溅射刻蚀的模拟研究

建立了磁控溅射单粒子模型，结合靶表面磁场的分布，用ＭｏｎｔｅＣａｒｌｏ研究了溅射气体粒子的运动规律，得到靶表面刻蚀的图形，发现靶中间环的刻蚀最强，这与实验结果和磁场的水平分量分布一致。     

空心阴极磁约束氦放电中电子运动计算机模拟

采用ＭｏｎｔｅＣａｒｌｏ方法，模拟了磁场影响下矩形空心阴极放电中电子的运动及其产生非弹性碰撞情况，得到了终止条件下电子的能量分布、空间分布，以及离子的空间分布．磁场的引入改变了电子的行程和产生各种非弹性碰撞的次数与位置，影响了整个放电过程．电子的各种参数分布的差异，正是由少数非弹性碰撞决定的．通过模拟得到：在恰当的磁场强度下，可改变电子的位置和能量分布，使总的离化数增加，改变负辉区和阴极位降区的离子分布，这对于更有效地控制激励、溅射和转荷反应过程，稳定放电有一定的指导意义．     

空间分辨光谱测量研究准分子激光对AI表面的烧蚀

采用空间分辨光谱测量技术，研究了３０８ｎｍ紫外激光烧蚀Ａｌ表面发射粒子的动力学过程。通过测量溅射粒子发射谱中Ａｌ（Ｉ）３９６．１和Ａｌ（Ⅱ）２８１．７ｎｍ线强度的空间分布，以及激光能量密度和不同烧蚀环境压力对它们的发射强度空间分布的影响，讨论了紫外３０８ｎｍ激光溅射Ａｌ表面发射粒子的微观过程。认为Ａｌ原子和Ａｌ离子的激发机理不完全相同，它们除被等离子体中的高电子碰撞激发外，Ａｌ离子和电子的复合，也     

空间分辨光谱测量研究准分子激光对Al表面的烧蚀

采用空间分辩光谱测量技术，研究了３０８ｎｍ紫外激光烧蚀Ａ１表面发射粒子的动力学过程。通过测量溅射粒子发射光谱中Ａ１（Ⅰ）３９６．１和Ａ１（Ⅱ）２８１．７ｎｍ线强度的空间分布，以及激光能量密度和不同烧蚀环境压力对它们的发射强度空间分布的影响，讨论了紫外３０８ｎｍ激光溅射Ａ１表面发射粒子的微观过程。认为Ａ１原子和Ａ１离子的激发机理不完全相同，它们除被等离子体中的高能电子碰撞激发外，Ａ１离子和电子的复合，也是引起Ａ１原子激发的一个重要通道。     

汞系超导材料的表面特征研究

采用溅射中性粒子质谱仪、俄歇电子能谱仪研究分析了（Ｈｇ０．６９Ｐｂ０．３１）Ｂａ２Ｃａ２Ｃｕ３Ｏ８＋δ超导体的表面状况，其中Ｈｇ元素以中性游离态存在，Ｐｂ元素的表面富集和Ｃａ元素的氧化态等现象表明，汞系超导体在表面形成钉扎中心和呈现不稳定性的表面性征。     

激光烧蚀溅射形成粒子流的碰撞效应模拟研究

在考虑由激光溅射产生等离子体粒子流质量分布为非弹性和非均匀性的两种情况下,用分子动力学方法模拟了基于分形理论的粒子流碰撞效应对等离子体速度与空间数密度分布的影响.计算结果表明:在粒子质量为分形和均值分布情况下,系统的速度分布和空间数密度分布由于能量耗散均偏离了初始分布,在质量为分形分布情况下,这种偏离更加明显;粒子分布呈现中间密、两端疏的分布特征.相应的模拟结果能与实验观测结果较好符合.     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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