改进的基于中国剩余定理群签名方案

指出一种群签名方案存在关联性和增删群成员后群公钥改变的不足,对原签名协议进行完善,改进方案由群成员和群中心合作完成群签名代替原方案的只有群成员单独完成群签名,在签名时间开销上有所增加,但保留了原方案的验证签名、增删群成员的高效,实现了不可关联性和增删群成员后群公钥不变,且避免了群中心伪造攻击.     

模糊群的子模糊群和正规子模糊群

设G为在模糊二元运算下的模糊群 .给出了G的子模糊群和正规子模糊群的定义 .讨论子模糊群和正规子模糊群的一些性质 .证明了子模糊群的交为子模糊群 ,子模糊群与正规子模糊群的“积”为子模糊群 .     

牡丹江地区玉米的亲本优势类群及杂优模式

牡丹江地区玉米的主要种质类群是桦甸红骨群、红玉米群、其他地方种质群、Lancaster群、改良Reid群、塘四平头群、温带种质新优势群、外引系及含热带、亚热带种质的新优势群等,早熟区主要杂优模式是“桦甸红骨群×红玉米群”、“桦甸红骨群×其他地方种质群”、“Lancaster群×非Lancaster群”,中早熟品种的杂优模式是“Lancaster群×非Lancaster群”,中晚熟选育品种以“Lancaster群×非Lancaster群”模式为主,但有“温带种质优势群×温带传统种质优势群”模式的加入,晚熟品种的杂优模式“Lancaster群×非Lancaster群”模式正在被“外引系及含热带、亚热带种质优势群×温带种质新优势群”模式取代。     

模糊群的同态

在模糊群之间引入了同态的概念 ,证明了子模糊群的同态象仍为子模糊群 ,子模糊群 (正规子模糊群 )的原象仍为子模糊群 (正规子模糊群 ) ,并给出了模糊群的同态基本定理 .     

所有无限真子群是阿贝尔群的局部幂零p-群

主要研究每一个无限真子群都是阿贝尔群的局部幂零p-群.给出了这类群的结构的详细刻画,得到了:定理1设群G是局部幂零p-群,若G不是阿贝尔群,但是G中的每一个无限真子群是阿贝尔群,则(1)当G不是幂零群时,G是秩为p-1的可除阿贝尔p-群被循环群的扩张;(2)当G是幂零群时,G是极小非阿贝尔p-群与拟循环p-群的乘积.     

一类p-群的结构

Yakov Berkovich提出如下一类p-群,称p-群G为B-群,若对任意交换子群A≤G,有NG(A)=G或NG(A)=CG(A)成立。利用这个定义对B-群进行初步的探讨,获得了这类群的一些性质。通过对子群的分析,得到了p-群成为B-群的充要条件,并进而得到B-群结构的若干结论。     

关于p－群和p－幂零群的若干结论

ｐ＊－群是ｐ′－群的推广，ｐ＊－幂零群是ｐ－幂零群的推广．研究了ｐ＊－群以及ｐ＊－幂零群的性质，得到有关ｐ＊－群和ｐ＊－幂零群的若干结论，还得到ｐ＊－幂零群和ｐ－幂零群之间的一些关系     

广义极小非幂零群

若有限群非幂零但其所有真子群均幂零,则称其为一个极小非幂零群．一类群称为广义极小非幂零群,如果它有一个非幂零真子群使得其它不包含在这个子群中的所有真子群均为幂零的．证得这类群可解,并讨论了该类群的子群的性质．     

其真商群为满足极大条件的FCc-群的群

如果FCc-群满足极大条件,那么称之为(FCc) max群;如果群G的所有真商群都是(FCc) max-群,但是G本身不是(FCc) max-群,那么称群G为外(FCc)-max群.主要利用外FNc-群的结果,给出外(FCc)max群的结构描述,同时还推广了群的上下中心列的有限性条件.     

关于幂零群的两个结果

可解群是有限群的一个重要研究领域,幂零群是一类特殊的可解群.利用幂零群和可解群的性质,将可解群的一个结论进行推广,给出了幂零群的一个充分条件.此外,对于幂零群的一个已知结果,本文提供了一个新的证明方法.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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