长度收缩佯谬与横向加速中的弯曲变形

问题的提出 从洛仑兹变换简式Δx′=β(Δx-VΔt)可以看出,对O′坐标系静止的一段长度Δx′,在O坐标系看来却是Δx=β~(-1)Δx′<Δx′,其中β≡(1-V~2/C~2)~(-1/2),因为O坐标系在度量Δx时选取的Δt=0。反之,从洛仑兹变换简式Δx=β(Δx′ VΔt′)可以看出,对O坐标系静止的一段长度Δx,在O′坐标系看来却是Δx′=β~(-1)Δx<Δx,因为O′坐标系在度量Δx′时选取     

单位圆盘与多圆柱上重调和算子的特征值估计

主要对单位圆盘Δ~1和多圆柱Δ~n上的Clamped Plate问题或Dirichlet双调和算子的问题进行了研究.得到了单位圆盘Δ~1和多圆柱Δ~n上Dirichlet重调和算子Δ~2的两特征值不等式.     

一类四阶Kirchhoff型问题的多解性研究

利用Ricceri变分原理研究了四阶Kirchhoff型问题{Δ(Δu_i︱~(p_i-2)(Δu_i)-[M_i(∫_Ω︱▽u_i︱~(p_i)dx)]~(p_i-1)Δ_(p_i)u_i+ρ_i︱u_i︱~(p_i-2)u_i=λF_(u_i)(x,u_1,…,u_n),x∈Ω,u_i=Δu_i=0,x∈Ω,解的存在性与多解性.     

路代数的同构

设K(Δ)表示有向图Δ在域K上的路代数,本文证明:(1)K(Δ)~+与K(Γ)~+代数同构当且仅当Δ与Γ边同构。(2)K(Δ)与K(Γ)代数同构当且仅当Δ与Γ同构。     

强边着色猜想问题的最优图

著名图论专家Erds和Nesetǐil对图的强边色数上界提出了一个猜想:当最大度Δ为偶数时,χ's(G)≤5/4Δ~2;当最大度Δ为奇数时,χ's(G)≤1/4(5Δ~2-2Δ+1);并且给出了当Δ=4时的最优图.此处构造了一族图,并证明了当最大度为奇数时,如果Erd9s和Ne2etǐil提出的强边着色猜想成立,则猜想中的上界是最优的.     

滤波问题的极大验后与极大似然估值的比较

本文讨论了滤波问题的极大验后估值与极大似然估值的比较,对于一个参数的直接观测导出了公式: ΔX/ΔX=1 K/n,K=σ_Δ~2/σ_x~2 X-X≈σ_xk/(n(n k))~(1/2)=σ_Δ(K/n(n k))~(1/2)对于多个参数的间接观测,文中以电子计算机的随机模拟方法进行了讨论。     

时标上一类p-Laplacian哈密顿系统周期解的多重性

研究了形式如下的时标T上非自治的p-Laplacian哈密顿系统{(|u~Δ(t)|~(p-2)|u~Δ(t)|)~Δ=▽F(σ(t),u~σ(t)),Δ-几乎处处t∈[0,T]_(T~k),u(0)-u(T)=0,u~Δ(0)-u~Δ(T)=0的边值问题,运用三临界点定理,得到了哈密顿系统多个周期解的存在性定理.     

全空间中椭圆方程组解的存在性

研究了下面椭圆方程组解的存在性问题{-Δu+qu=2α/α+β|u|~(α-2)u|v|~β,x∈R~N,-Δv+qv=2β/α+β|u|~α|v|~(β-2)v,x∈R~N,u,v∈H~1(R~N)。通过Nehari流形法证明了以上方程组具有非平凡解。     

一个计算滴定误差的通用公式

本文给出一个计算 Lewis 酸碱滴定误差的通用公式:TE(%)=(10~(ΔPA)-10~(-ΔPA))/((K_TC_A~(eq))~(1/2)×100并对该公式的应用进行了讨论。     

中国软珊瑚化学成分的研究(二十一)——戚氏豆荚软珊瑚(Lobophytum chevalieri Tixie Duriult)的化学成分

从软珊瑚戚氏豆荚(Lobophyium chevalieri)分离得15种结晶性物质。本文报道2个神经酰胺类化合物,其中Δ~(4’5)(E),Δ~(11’12)(Z)-鞘氨醇-正十六碳酸酰胺(Lobophyta-mide L_8)为一新化合物,另一个为Δ~(11’12)(E)-鞘氨醇-正二十四碳酸酰胺(Lobophytami-de L_5),经IR、MS、~1H和~(13)C NMR谱分析、元素分析以及其他方法确定了它们的结构。     

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