正项级数敛散性的一种新的判别法

以级数∞∑n=21/n(lnn)p(p＞0)为标准,利用泰勒展式与高阶无穷小,仿照拉贝判别法的形式进行讨论,建立了一种比拉贝判别法更为有效的判别法.     

正项级数敛散性的一种新的判别法

以级数∞∑n=21/n(lnn)p(p＞0)为标准,利用泰勒展式与高阶无穷小,仿照拉贝判别法的形式进行讨论,建立了一种比拉贝判别法更为有效的判别法.     

正项级数敛散性判别的一种新方法

正项级数的比较判别法,常见的有达朗贝尔判别法、柯西判别法、拉贝对数判别法和高斯判别法等,但各有优缺点,本文主要研究了拉贝(Raabe)判别法,并在此基础上给出了它的推广.     

正项级数敛散性判别法的推广

给出了正项级数敛散性判别的达朗贝尔判别法、拉贝判别法、对数判别法的推广形式。     

双比值判别法与对数判别法的比较

双比值判别法是近年来提出的判别正项级数敛散性的一种新方法，它强于传统的达朗贝尔判别法与拉贝判别法．关于双比值判别法与对数判别法的强弱关系问题是值得探讨的．通过对这两种判别法中所含极限的存在性关系的研究，可以得出对数判别法强于双比值判别法的结论．     

正项级数敛散性一种判别方法

对于正项级数敛散性判定,当比式判别法失效时,给出一种新方法.该方法在判别某些正项级数敛散时比拉贝判别法更方便.     

拉贝判别法的等价性

正项级数中拉贝判别法，是可以判别级数的项收敛于零的速度较慢的一些正项级数，因此Ｒａａｂｅ判别法判别级数的范围更大，笔者在于创建一个新的判别法，并进一步研究这个新的判别法是与Ｒａａｂｅ判别法等价的。     

正项级数敛散性的一个新判别法

正项级数理论中的Gauss判别法比Raabe判别法更为精细,但又更加复杂,为此给出了正项级数敛散性的一个新判别法,它也是以级数∑∞n=21n(lnn)p为比较标准的,但比Gauss判别法简单.另外,还对新判别法与Gauss判别法的强弱关系进行了讨论.     

正项级数收敛性的又一新判别法

近年来,关于正项级数收敛性判别法又有一些新的研究,其中主要是得到了一些关于收敛性的新判别法以及对有关判别法的强弱进行了讨论.本文建立了正项级数收敛性的又一个新判别法,它适用判别与级数∑∞n=21n(lnn)s敛散速度相当的正项级数的敛散性,因而新判别法比传统的Raabe判别法等更为精细.此外,通过与Gauss判别法进行比较,得出了新判别法强于Gauss判别法的结论.     

正项级数敛散性的两种判别法之间关系的讨论

探讨了正项级数敛散性的两个常用判别法即达朗贝尔(DAlembert)判别法和柯西(Cauchy)判别法之间的关系,给出了相应的几个结论并加以证明,还以具体例子给予验证。     

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.     

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