关于高斯函数的几个恒等式

对高斯函数的两个恒等式：〔ｘ〕＋〔ｘ＋１／ｍ〕＋．．．＋〔ｘ＋ｍ－１／ｍ〕＝〔ｍｘ〕，其中ｘ∈Ｒ，ｍ∈Ｎ；１／２（ｐ－１）Σ（ｋ＝１）〔ｋｑ／ｐ〕＝Ｐ－１／２．ｑ－１／２，其中ｐ、ｑ是正奇数且（ｐ，ｑ）＝１，以及Ｔｏｍ．Ｍ．Ａｐｏｓｔｏｌ的一个问题“若ａ＝１，２，３，４，５，６，７。证明存在一个（依赖于ａ的）整数ｂ，使得ｎΣ（ｋ＝１）〔ｋ／８〕＝〔（２ｎ＋ｂ）＾２／８ａ〕”，作了进一步的推广，得到     

具有分段常自变元的时滞微分方程解的振动性

考虑方程（ａ）（ｘ（ｔ）－ｃｘ（ｔ－２「ｔ＋１）／２」））’＋ｐ（ｔ）ｘ（ｔ）－２「（ｔ＋１）／２」）＋ｑ（ｔ）ｘ（２「（ｔ＋１）／２」＝０解的振动性和方程（ｂ）（ｘ（ｔ）－ｃｘ（ｔ－τ））’＝ａ（ｔ）ｘ（ｔ）＋ｂ（ｔ）ｘ「ｔ－ｋ」）解的非振动性,得到方程（ａ）的解振动的充分条件和方程（ｂ）的解非振动的充分条件。     

一阶中立混合型微分方程振动的四个充要条件

本文研究中立混合型微分方程［ｘ（ｔ）ｔｐｘ（ｔ－τ）］＇＋ｑ１ｘ（ｔ－σ１）＋ｑ２ｘ（ｔ＋σ２）＝０（１）的振动性，这里ｐ，ｑ１，ｑ２，τ，σ１，σ２都是正实数。获得了方程（１）振动的四个明确的充要条件。     

多个滞时微分方程的Runge－Kutta法的数值稳定性分析

本文将Ｒｕｎｇｅ－Ｋｕｔｔａ法应用于解多个滞时的微分方程．主要研究该方法数值解线性试验方程ｙ＇（ｔ）＝ａｙ（ｔ）十ｂ１ｙ（ｔ—τ１）十ｂ２ｙ（ｔ—τ２）（其中τ２≥，τ１＞０，ａ，ｂ１，ｂ２为复数）的稳定性态．我们证明满足条件ｄｅｔ（Ｉ—ｘＡ）＝０ｄｅｔ［Ｉ—Ａ十ｘｅｂＴ」≠０（ｘ∈Ｃ）的Ｒｕｎｇｅ－Ｋｕｔｔａ法是ＧＰ－稳定的当且仅当该方法是Ａ－稳定的．     

CVD 矩阵与 n-宽度的(p,q)问题

证明了ｄ２ｋ＝δ２ｋ＝ｄ２ｋ≥ｂ２ｋ，其中ｄ２ｋ、δ２ｋ、ｂ２ｋ分别表示Ａ（ＢＭｐ）在ｌＮｇ中的ｋｏｌｍｏｇｒｏｖ、线性、Ｂｅｒｎｓｔｅｉｎ型２ｋ－宽度，ｄ２ｋ表示ＡＴ（ＢｌＮｑ′）在ｌＭｐ′中Ｇｅｌ′ｆａｎｄ型２ｋ－宽度，这里Ａ（ＢＭｐ）＝｛Ａｘ：ｘ∈ＡｌＭｐ，‖ｘ‖ｐ≤１｝，其中Ａ是一个Ｎ×Ｍ的ＣＶＤ矩陈（Ｎ＞Ｍ＝ｒａｎｋＡ，Ｍ是奇数），１ｐ＋１ｐ′＝１，１ｑ＋１ｑ′＝１（１≤ｑ≤ｐ＜＋∞，ｐ≠１）．     

关于E^n中p维与q维超平面间的距离

设Ｅｎ中ｐ维与ｑ维超平面分别为πｐ：α１∧α２∧…∧αｐ∧（ｘ－ｘ０）＝０，πｑ：β１∧β２∧…∧βｑ∧（ｙ－ｙ０）＝０，｛γ１，γ２，…，γｔ｝是向量组｛α１，α２，…，αｐ，β１，β２，…，βｑ｝的一个极大线性无关组，则πｐ与πｑ间的距离平方为：ｄ２（πｐ，πｑ）＝｜δ０｜２－γ１δ０，…，γｔδ０［］γｉγｊ［］－１γ１δ０，…，γｔδ０［］Ｔ其中δ０＝ｘ０－ｙ０．     

关于孪生素数椭圆曲线的联立Pell方程组

设ｐ、ｑ是适合ｐ＋２＝ｑ的奇素数，δ∈｛－１，１　｝。本文证明了：当且仅当ｐ＝３，ｑ＝５，δ＝１时，联立Ｐｅｌｌ方程组ｘ２－ｐｙ２＝δ和ｚ２－ｑｙ２＝δ有整数解（ｘ，ｙ，ｚ）＝（７δ，４δ′，９δ″），其中δ，δ′，δ″∈｛－１，１｝，适合ｙ≠０。     

多元Cp统计量

对回归模型ｙ＝β０＋βｌｘｌ＋．．．＋βｌｘｔ，把Ｃｐ统计量推广到ｑ≥１的情况，得到Ｃｐ＝（２ｐ－ｔ－１）ｑ＋（ｎ－ｔ－ｑ－２）ｔｒ〔（ＲＳＳ）＾－１（ＲＳＳｘ－ＲＳＳ）〕，并讨论了Ｃｐ的若干统计性质。     

中立型线性微分—差分方程的稳定性

应用Ｌｉａｐｕｎｏｖ泛函法研究了［ｘ（ｔ）－Σｋｉ＝１Ａｉｘ（ｔ－τｉ）］′＝－Ｂ０ｘ（ｔ）－Σｋｉ＝１Ｂｉｘ（ｔ－τｉ）中立型微分－差分方程的稳定性，其中ｘ∈Ｒｎ，Ｂ０，Ａｉ，Ｂｉ（ｉ＝１，２，…，ｋ）皆为ｎ×ｎ阶实常阵，τｉ∈（０，＋∞）（ｉ＝１，２，…，ｋ）．得到了该方程平衡态稳定性的几个充分判据     

一类中立型微分差分方程解的振动性与渐近性

研究了微分差分方程ｘ（ｋ）－∑Ｃｋｘ（６－τｋ）＋∑Ｐｉ（ｔ）ｘ（ｔ－ｒ）＝０的振动性渐近性，其中０〈τ〈τ２〈…〈τｍ，０〈ｒ１〈ｒ２〈…〈ｒｎ，Ｃｋ≥０均为常数（ｋ＝１，２，…），Ｐｉ（ｔ）≥０连续（ｉ＝１，２，…ｍ），改进并推广了已知的一些结果。     

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