关于有限域Fp2上的原根求法的注记

在四川大学学报(自然科学版)2003年第3期“关于有限域Fp^2上的原根”一文中,霍家佳等给出了一个从有限域Fp^2的原根出发求Fp^2的原根的算法,这个算法共含三大步．在本文中,在不改变霍文算法整体框架(即三大步)的前提下,作者利用关于原根的基本性质改进了这个算法的三大步,特别利用一个已知的关于原根的充要条件改进了这算法的第三步．改进后的算法三大步运算量分别是原算法三大步运算量的1／4或有数量级的减少不等．最后给出一个算例来具体体现改进后的算法的运算量的减少程度。     

关于有限域Fp2上的原根

在椭圆曲线公钥密码体制中,要计算有理点的数目,一个公认为有效的Schoof算法需要用到有限域Fp2的原根.在实用的时候,常常只需要大约200以内的p.作者从有限域Fp的原根出发得到一个求Fp2的原根的算法,而且对较小的p(p<200)得到Fp2的原根表.     

有限域Fqn上原根的充分必要条件

在椭圆曲线公钥密码体制中,计算q元域Fq上椭圆曲线有理点的数目是至关重要的,这里q为素数p的幂.一个公认有效的计算有理点数目的Schoof算法需要用到有限域Fp2的原根.设n是一个正整数,F=Fqn为q元域K=Fq的n次扩张,α是F中的任意元,NF/K(α)是α在K上的范函数.用初等而简洁的方法,得到了α是F的原根的几个充分必要条件,并由此给出了由K的原根求Fq2的原根的一个算法.     

有限域Fp^2上原根计算的改进

从有限域Fp的原根出发有一个求FP2的原根的算法,这个算法共含三大步.研究并简化了第三步,使得运算量为已有最快算法的2/3或有数量级的减少不等.     

有限域的原根及Δ_p上的不可约多项式

给出了有限域Fpn的原根的个数以及Δp上的n次不可约多项式的个数的计算公式.     

关于有限域上正规基的一个注记

我们用初等方法证明了Chang等人在Journal of Algebra上发表的文章的主要结果:令p是一个素数,q是p的方幂,F_q是含q个元的有限域.若整数n≥2,则任一个n次首一非零迹的不可约多项式都是F_q上的正规多项式当且仅当n是p的方幂或n是一个不等于p的素数且q为n的一个原根.     

形如p=2~αp_1p_2+1及p=2~αp_1p_2p_3+1的素数模的全部原根的求法

本文类似于[1],在已知一个原根的前提下,给出形如p=2~αp_1p_2+1和p=2~αp_1p_2p_3+1的素数模的平方非剩余中所有不是原根的数,从而得到全部原根。     

RSA的比特安全性

Boneh和Venkatesan提出了一个多项式算法，用以恢复p个元素的有限域Fp的隐藏数α，在此基础上得到了许多推广及在某些密码系统的应用。文中把这些结果应用到RSA的比特安全性分析上．     

关于Golomb猜想

Golomb 猜想为:在任何有限域 GF(p~n)中总存在两个本原元,它们的和等于1.张肇键和 I.S.Reed 证明了在某些类型的有限域中 Golomb 猜想成立.本文的目的是证明比[2]的定理3和定理5更强的定理,对更多一些特殊情况证实 Golomb 猜想,我们将利用下列引理.引理1 设 q_1,q_2,…,q_k 为 p-1的所有不同的奇素因子,则素数 p 的平方非剩余 g 为 modp 的原根的充分必要条件是 g~((p-1))/2_(gi)(?)-1(1≤i≤k).引理2 设 p=2q+1,p,q 均为奇素数,则从 p 的全部平方非剩余中去掉p-1后全部是 modp 的原根.     

关于有限域上正规基乘法表的一个算法

作者给出计算有限域上正规基乘法表的一个算法．特别地，对于特征为2的有限域上的I型最优正规基，这个算法是非常有效的．     

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.     

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