导数在计算行列式中的应用

本文探讨了用导数的方法计算有关行列式的问题。对某些行列式问题，视行列式是某个变量的函数，由行列式的求导法则，求此行列式的导数，然后通过积分求解该行列式。运用导数计算某些行列式，可使计算由繁变简。     

准Vandermonde行列式

Vandermonde行列式的元素排列和行列式的值都具有高度对称性,是一个具有广泛应用的行列式。文章将其一般化,讨论分块形式的Vandermonde行列式-准Vandermonde行列式,运用矩阵分块运算方法和技巧,得到了相应的计算公式,从而推广了范德蒙德行列式。     

范德蒙行列式的应用

行列式最早出现在16世纪关于线性方程组的求解问题中,时至今日行列式理论的应用却远不如此。它主要应用于高等代数理论,作为一种特殊的行列式——范德蒙行列式不仅具有特殊的形式,而且有非常广泛的应用。本文探讨了范德蒙行列式在向量空间理论、线性变换理论、多项式理论中以及行列式计算中的应用。同时,本文还用增补法证明了范德蒙行列式的一个性质,即n阶准范德蒙行列式的计算方法,并使其能解决一类行列式的计算问题。     

行列式的计算方法解析

行列式求解在各个领域中有非常广泛的运用.通过分析一些具体实例,介绍了7种行列式的计算常用方法,包括n阶行列式、抽象行列式、行列式的展开定理以及代数余子式的应用,为今后学者们求解行列式提供了一些可行的方法.     

多项式在计算行列式中的应用

本文给出了几种类型的行列式的计算,如主对角线两旁的元素完全相同的行列式,对称行列式等．运用多项式有关根的性质,及行列式几个结论来计算行列式的值。     

一个函数的扩充定义

分析了城上方阵行列式的拓广意义与拓广方式。给出了有限代数上方阵的行列式定义,并指出这种行列式的具有域上方阵行列式的主要性质。     

行列式的归纳定义及其性质的证明

在不同的代数教材中给出了行列式的不同定义,一般教材中n阶行列式的古典定义,学生学习起来比较困难,有些教材采用归纳法定义n阶行列式,但是行列式性质的证明却很复杂,不得不把证明放入附录中.为了使学生学习起来比较顺畅,采用归纳法定义n阶行列式,利用全新的方法给出了n阶行列式性质的简单证明,并给出了n阶行列式的古典定义与归纳法定义的等价性的证明.     

一类行列式的计算--范德蒙行列式和行列式乘积的应用

应用范德蒙行列式和行列式乘积,讨论了一类行列式的计算.     

0行列式的定义

补充定义 0阶行列式的值 ,从而完善行列式的有关理论并简化行列式的计算与证明     

O行列式的定义

补充定义0阶行列式的值,从而完善行列式的有关理论并简化行列式的计算与证明.     

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