代数模型下氨振动谱的计算

利用代数模型计算多原分子的键振动和弯曲振动谱，键振动和弯曲振动之间的耦合用费米共振项描述，用局域产生(湮灭)算符构造代数哈密顿，计算表明与氨的实验数据有较好的一致性．     

电子关联对聚乙炔中双激子湮灭过程的影响

在SSH哈密顿基础上引进弱电子关联，对反式聚乙炔链中双激子的湮灭过程实施了分子动力学模拟．电子关联的引入延缓了链中激子的湮灭过程，关联强度U=0eV时，激子的湮灭时间约在t=84fs，计入四个近邻格点上的弱电子关联作用，湮灭时间明显减慢，约为t〉100fs．随着弱关联强度的增加，湮灭时间逐渐延长．计算结果表明，在计算有...     

光薄非热e^＋—e^—等离子体湮灭谱

本文计算了光薄条件下,非热e~+-e~-湮灭谱型,获得了其积分表达式,并给出了其数值终果。     

双稳系统中布洛赫波峰湍流的统计性质

双稳系统中的布洛赫波峰的横向失稳可以引起波峰湍流,其不规则运动体现为斑图中的漩涡自发而不规则地产生和湮灭.本文以受驱动系统的复Ginzburg-Landau方程为模型,研究了布洛赫波峰湍流的统计性质.计算了漩涡产生速率和湮灭速率,以漩涡数量时间序列为基础,给出了漩涡动力学变化遵循的主方程.对湍流中漩涡对关联函数的计算表明,漩涡产生/湮灭速率中各幂次项来源于漩涡产生/湮灭事件与周围不同数量的漩涡的短程相互作用.     

B介子非轻无璨衰变Bs→π+π-中湮灭强度的探索

在大多数B介子非轻无璨衰变中，湮灭贡献都带有不同于树图、企鹅图振幅中的强位相和弱位相，这对研究CP破坏很重要．同时，对于湮灭图自身来讲，计算它的贡献也很有意义：如果知道了湮灭图的贡献，将有助于我们更好的理解低能QCD动力学，研究理论方法是否具有可行性．BS^-→π^ π^-过程有较大的CP破坏，其CP破坏不仅来源于树图算符也来源于企鹅图算符；     

辐射弱衰变B→D*(s)γ的研究

从W湮灭的低能有效哈米顿出发,在夸克层次对弱湮灭辐射跃迁过程导出了有效拉格朗日,然后用于计算弱辐射湮灭过程B→D^（s）γ并且与其他模型预测进行了对比,结果表明这些衰变道可在近期的B工厂和LHC上被探测到．     

利用MC方法模拟计算β+粒子在MB容器中的湮灭几率

用蒙特卡罗方法模拟计算了MB型容器中具有β+衰变的放射性气体衰变时放出的 β+粒子在容器内空气中和容器壁上的湮灭几率 .计算结果得到 :β+粒子在容器壁上的湮灭几率远大于在容器内空气中的湮灭几率 ;在壁上的湮灭几率近似与容器壁面积大小成正比 ;尽管气体源是一均匀分布体源 ,但 β+粒子在容器内空气中并非均匀湮灭 ,而是在容器中心部位的湮灭几率高     

重子共振态反应中的正负电子对

本文研究了ΔΔ相互作用反应中的正负电子对产生，计算了微分截面，给出了考虑介质效应后的生产率，并与ππ湮灭过程的产生率比较。     

对一种唯象的N周边湮灭势的研究

本文使用一种唯象的Ｎ周边湮灭势，对１８０ＭｅＶ的在~(１６)Ｏ上的弹性微分截面进行计算，理论结果与实验符合得较好。     

QCD因子化框架下Β_s→PP衰变中湮灭图效应

CDF和LHCb实验组对Bs介子衰变中纯湮灭过程的测量揭示了大湮灭图贡献的存在.基于日益精确的B介子衰变测量实验结果,本文在QCD因子化框架下研究了湮灭图贡献的效应,对Bs系统中的湮灭图参数空间进行了拟合,并结合Bu,d介子衰变分析了湮灭图贡献对初态的味道依赖性.在本文得到的参数空间内,Bs→ππ,πK,KK衰变的理论结果与实验数据一致.然而,在目前的理论计算和实验精度下,湮灭图参数对初态味道的依赖性很难被严格辨别,即ΧiA对Bs和Bu,d系统仍可以是普适的.     

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     

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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