高温超导体微波非线性效应的磁通束跳跃模型

通过对高温超导体混合态中磁通束跳跃模型的理论分析，讨论了高温超导体的非线性现象，给出了微波射频电流Irf与材料样品的微波表面阻抗△HZs之间的关系表达式：△HZs∝Irf,分析结果表明，高温超导体的非线性效应可以用磁通束跳跃模型来解释．     

关于二次系统极限环的分布

讨论了二次多项式系统的极限环的相对位置问题 ,证明当l≥ 0 ,mδ >0时 ,系统 (E2 )的极限环是集中分布的 ;当l<0时 ,给出了系统 (E2 )的极限环集中分布的充分条件     

高温超导体中超导位相涨落:Nernst效应研究

高温超导体赝隙态具有许多反常的现象,与高温超导机理之间有密切联系,一直是研究的焦点.有理论提出在赝隙态存在预超导配对.能斯特（Nernst）效应测量探测到了超导转变温度TC0以上温区一定范围内存在磁通涡旋激发,支持了赝隙态中存在有限的超导序参量振幅和强烈的位相涨落的图象,说明TC0处的相变是由Cooper对之间长程位相关联的消失所驱动的.     

碳纳米管交流输运特性研究

提出了一种新型的研究半导体低维系统的含时输运特性的数值模拟方法.基于紧束缚模型,直接在时域采用迭代法计算含时的非平衡格林函数(NEGF),求解出交流信号作用下的响应电流.将该方法应用于低维碳纳米管系统的交流输运性质的研究,并对载流子含时输运的物理机制进行了阐述.结果表明:在外加电压作用的瞬间,电流值突然变得很大,类似于传统CMOS器件的过冲效应.当输入电压为单个方波,随着时间的推移,电流呈现出平滑的逐步振荡衰减,最终趋于稳态.当输入电压为连续方波,响应电流的振荡幅度和频率随电压幅度的增加而增加.仿真结果有助于对低维材料电学特性的评估,并且为将来工作在交流信号下的低维纳米电子器件的设计和制作提供初步的理论依据.     

W[111]场致电子发射的实验研究

本文讨论了场发射尖端附近电场强度分布,对W[111]场致电子发射特性作了实验研究。提出计算尖端附近电场的经验公式:E=3v/(2rln(4d/r))得到:当真空度为1×1~(-9)托,束流为1～5μA时,场发射电流的稳定性ΔI/I<2%。     

阱的非简谐性对玻色-爱因斯坦凝聚集体激发的影响

研究了在一个二次方加四次方势阱V(x)=12(x2 λx4)中玻色-爱因斯坦凝聚体(BEC)的集体激发.运用变分法得到了准一维BEC的2个低能激发模,研究了阱的非简谐性对BEC集体激发的影响,发现当λ>0时,两低能模频谱发生蓝移;当λ<0时,两低能模频谱发生红移.讨论了不同振幅驱动激发下BEC质量中心和宽度的变化:由于囚禁势阱的非简谐性,BEC两低能激发模会发生耦合,使宽度变化产生谐拍.给出了频率驱动下宽度的响应结果.     

高温超导体中不同临界态模型下的磁弛豫

基于Anderson-Kim临界态模型,考虑涡旋玻璃态模型和集体磁通蠕动理论以及考虑磁通线反跳的热激活模型等目前几种关于高温超导体中磁弛豫现象的理论模型,推导出弛豫率和约化弛豫率的理论计算公式并在此基础上分析各个理论模型下弛豫率和约化弛豫率的理论计算结果和实验数据之间的关系,对各个理论模型的适用范围进行分析和比较.     

一种可能的超导孤子通道：带有非对称双阱势的氢键链

证明了在带有非对称双阱势的有阻尼的氢键链中,当无外场时,也存在运动的扭结孤子激发,扭结和反结是成对出现并以相等相反的速度运动的,这预示这类氢键链将可能作为一种孤子型超导电通道讨论了扭结－反扭结对的平衡分布,推导出一条分子链所输运的超导电流     

Moore-Penrose广义逆矩阵的一些性质

给出Moore -Penrose广义逆矩阵的一些性质 ,不相容线性方程组AX =b ,当A发生扰动E =(0 ,… ,a ,… ,0 ) ,b发生扰动Δb时 ,最小范数最小二乘解的扰动估计。     

自旋为1的玻色-爱因斯坦凝聚体中的铁磁核涡旋

文章从理论上模拟了柱状光学箱势阱中准二维铁磁性凝聚体的一种新的拓扑激发-铁磁核涡旋。采用变分法得到了基态下铁磁核涡旋的数密度和自旋密度的空间分布,并给出了一个实验建议。对于其中出现的极化环,我们给出了一种合理的解释。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-