Z2Z4上的加性负循环码

在Z_2Z_4-加性循环码的基础上构造负循环码。首先,引入Z_2Z_4-加性负循环码的定义及其构造;然后,构造其生成多项式及张成集;最后,通过实例说明其与加性循环码有相同的参数。     

关于almost balanced度量的一些结果

介绍了almost balanced度量和一种近Hermitian流形上T2-丛的构造方法.同时给出了构造出的T2-丛上具有almost balanced度量的条件.最后构造了一些具有almost balanced度量的流形.     

C~n或R~n中代数簇按秩分解的次数S≤2~n-1是最优估计(英文)

1957年,Whitney曾証明了C~n(或R~n)中的任何一个代数簇V可以按秩分解为V=M_1U…UM_3,这里M_1是复的(或实的)解析流形,而且S≤2~n—1。本文的目的是构造一代数簇,使S=2~n—1。为此,我們先証明几个引理,然后构造一批代数簇。最后,通过线性变换把这批代数簇平移到适当的位置。于是,这批平移后的集合之併就是所需的代数簇。     

基于Grassmann流形距离的动作识别

利用时空兴趣点间的位置及局部特征相似度信息,提出一种局部邻域特征以描述局部数据结构,然后引入核主角度及Grassmann流形距离以度量2个邻域特征距离,通过构造随机流形森林学习数据样本在Grassman流形上的类条件概率密度函数,最后使用多核学习算法实现对随机流形树的剪辑及动作分类.在KTH及UCF-CIL动作数据库的实验证明:所提动作表示方法能有效描述人体运动信息,且该动作识别算法的识别率优于近年提出的典型动作识别系统.     

闭流形上向量丛的(Z_2)~k群作用

给出了光滑范畴下带有(Z_2)~k群作用的闭流形上向量丛等变配边于零的一个充分条件:闭流形的维数大于2~k倍不动点集的维数;不动点集的Stiefel-Whitney类为零;不动点集的分支满足线性独立条件.同时在闭流形的维数等于2~k倍不动点集的维数的情况下,如果再进一步加强条件为向量丛配边为零,则向量丛等变配边于零.     

约束力学系统广义Chaplygin方程的现代几何表示

运用现代微分几何方法,研究一般约束力学系统约束嵌入型的动力学方程的整体几何表述问题.首先,构造约束系统相空间上的非完整联络;其次,给出经典d-δ交换关系的几何意义;最后,构造约束流形上的基本2-形式,得到广义Chaplygin方程的整体几何表述.     

旋转动力学理论:思维动力

只有进展到心理的动力属性,才有可能解释、推测和控制思维事件.该文在创新计算的旋转动力学框架内探讨思维流形上的思维动力系统,思维流形只局部同胚于欧氏空间,没有全局坐标系统,因而没有全局动力系统,只能首先在思维流形上的切空间中建立多类局部的随机动力系统,然后通过流形上的联络整合它们以构造全局动力系统.     

局部和整体共形balanced流形的关系

证明局部共形balanced流形和整体共形balanced流形之间有如下的关系:如果一个局部共形balanced流形满足-引理,那么该局部共形balanced度量是一个整体共形balanced度量.     

环Z4上自对偶码的一种构造方法

文章利用环Z_4+uZ_4(u~2=0)上的自对偶码构造了环Z_4上的自对偶码,通过引入环Z_4+uZ_4到环Z~n_4的Gray映射,得到环Z_4+uZ_4上自对偶码的一些性质;给出Z_4+uZ_4上自对偶码的欧几里得距离的上界,并且构造了一些参数较好的自对偶码。     

基于同步方法的观测器设计

 基于ODE系统的混沌同步方法,用惯性流形方法和自适应控制方法研究观测器的设计。对于参数确定系统,构造的观测器是全局的,初值可以任意选取,而且所得结果对于初值敏感的混沌系统依然适用;对于参数未知系统,构造的观测器只是局部的。作为示例,为蔡氏电路(Chua's Circuit)和未知参数的Lorenz系统分别设计了观测器,并进行了模拟和仿真验证。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has