小世界网络上的Ising模型

在一维规则环链的基础上，构造了小世界网络，研究了其上的Ising模型的相变行为．Monte Carlo方法被用来作为研究的方法．模拟结果发现，所构造的小世界网络上的Ising模型存在相变，模拟结果给出了临界温度．     

弱边界条件对Ising模型谱缝隙的影响

讨论了弱边界条件对Ising模型谱缝隙的影响程度. 在二维有限正方形整点上,对于低温状态下无外场的Ising模型,给出了其谱缝隙的范围值. 主要利用对自由边界Ising模型的研究方法来对弱边界条件的Ising模型谱缝隙进行估计.     

一维超Ising模型

Ising模型对解决局域磁矩间的问题非常有效,然而它只考虑了相邻两电子间的相互作用.通过对所有电子自旋的相互作用的分析,将非相邻的相互作用看成平均场对自旋的作用,计算出一维超Ising模型的配分函数,并推导出一维超Ising模型铁磁相、顺磁相的居里温度及顺磁相磁化的居里—外斯公式,最后从物理上解释了一维Ising模型和一维超Ising模型铁磁相存在与否的根本原因.     

格点Sierpinski地毯上具有正边界条件Ising模型的谱缝隙估计

主要采用Ising模型的blockdynamics方法,且对Ising模型正负粒子分离线高度进行估计.对于无外场的Ising模型,当参数β充分大时,给出了Ising模型谱缝隙的一个下界.     

一维准周期Frustrated伊辛模型的低温特性

本文提出了介于周期和随机结构之间的准周期Frustrated Ising 模型,并应用Rujan 提出的求配分函数的叠代方法,找出了一维Fibonacci 准周期Frus-trated Ising 模型在低温时的各种热力学函数,以及它们随模型参数和温度的变化.然后,把它们同一维周期Frustrated Ising 模型和一维Ising 自旋玻璃模型的结果进行了比较.最后,对计算的结果进行了分析和讨论.     

二维Ising模型临界相变的Monte-Carlo数值模拟

基于二维Ising模型,讨论用Monte-Carlo方法数值模拟正则系综的临界行为.计算结果表明此数值仿真能够显示二维自旋晶格的自发磁化.该文确立的方法可以为三维Ising模型的仿真计算打下基础.     

GPU加速模拟混合自旋的Ising模型

基于传统的Monte Carlo方法,利用CUDA(compute unified device architecture)技术,在GPU上分别模拟了正方晶格,三角晶格上较为复杂的不同浓度比的混合(自旋S=1和S=1/2)Ising模型,获得了不同浓度比的临界温度K c以及临界指数y t、y h。与同时期的CPU算法相比,基于GPU的并行模拟算法大大提高了算法效率,对于尺寸为1 024×1 024的混合自旋的Ising模型,在正方晶格上实现了40倍的加速比,在三角晶格上实现了41倍的加速比。     

混合Ising自旋模型的联合重正化群研究

本文应用文献[1]提出的联合实空间重正化群方法计算唐坤发和胡嘉桢提出的推广Ising自旋模型，首次得到Schofield和Bowers提出的混合Ising自旋模型的合理的临界点，并得出这种推广Ising自旋模型的较精确的相变流图，可靠地证明了混合Ising自旋模型与纯Ising自旋模型属于同一普适类。     

可调型Ising模型及其在高分辨率影像主干道提取中的应用

结合基于随机场理论的影像分类技术,提出高分辨率影像的主干道提取算法.在影像分类时,通过Ising模型将像元空间上下文关系融入到分类中.为避免由Ising模型的边缘模糊现象,对该模型进行了改进,并提出可调型Ising模型.新模型通过对边缘处和区域内的像元施以不同强度的类型平滑操作,不仅避免了边缘模糊现象,而且还有效地屏蔽了主干道区域内噪声和细节信息的干扰,提高了分类结果中该区域的完整性.最后,根据几何形状特征在分类结果中对主干道进行提取.结果表明:相比基于K均值聚类法和基于Ising模型分割算法的提取结果,本文算法在区域完整性和边缘类型判别精确性等方面均有较大程度的提高.     

二维Ising模型元胞自动机(Q2R)模拟

用元胞自动机Q2R规则来模拟微正则系综的临界行为,同时考虑到二维Ising模型[2]的同步演化.计算结果表明,此数值仿真能够显示二维晶格在孤立条件下的自发磁化.可以为三维Ising模型的仿真计算奠定基础.     

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