内爆荷载作用下结构等效静载计算方法

爆炸发生在结构内部时，结构受到双重荷载作用：瞬时的冲击波荷载和长时间的准静态气体压力。针对内部荷载特点，采用等效单自由度法推导出了用于计算等效静载的动效系数解析式，并根据冲击波脉冲作用时间远远小于结构自振周期的情况，给出了简化表达式。参照此简化表达式，并根据计算的精确值，获得子具有明确的物理意义，可以代替原复杂解析式的精确简化表达式，为结构抗内爆炸设计提供方便。     

非等时变分和Hoelder原理

在推导Hoelder原理的过程中，一个关键步骤是应用非等时变分的一个基本表达式，无论从解析法出发或从图解法出发都证明了，在可变函数具有零阶接近度的情况下，这个基本表达式是不正确的，并且推导出一个与上述基本表达式不同的新的表达式。为了慎重起见，联合应用变分学和微分学来研究非等时变分，除验证了新的表达式的正确性之外，还得到一个与之等价的表达式。随后，从可变函数曲线的接近度的概念入手来进一步讨论问题，借助这一等价的表达式，证明了非等时变分的那个基本表达式在可变函数具有一阶接近度时是正确的。进一步的研究表明，在推导Hoelder原理的过程中还存在一个隐含的表达式，通过类似的研究证明，当可变函数曲线具有二阶接近度时，才能保证这个隐含的表达式成立。     

自然数幂求和公式的计算机实现的两个注记

利用Vandermonde行列式和Cramer法则，证明了一个自然数幂求和公式的一般表达式，并通过Maple软件利用计算机进行了求解，得到了与《自然数幂求和公式的计算机实现》一文完全相同的结果。进一步运用该方法，还解决了多项式表素数问题，得到了一个用关于正整数n的N次多项式表示素数的一般性结论，并得到有效的应用。     

亏损系统的时域随机响应分析

对于常参数线性阻尼系统，如果系统是亏损的，复模态分析就不再适用。该文基于广义模态分析，研究了亏损系统在白噪声及滤过白噪声这２种典型激励下的平稳随机响应问题，推导了在此激励下系统响应协方差函数矩阵的解析表达式，该表达式只包含有复代数运算，十分便于求解，并且当系统为非亏损时，上述表达式即可简化为非亏损系统随机响应表达式的形式，因此该结果可用于分析包括亏损系统在内的一般线性时不变系统的随机响应问题。     

关于若干共轭多烯HMO的系数问题

通过三角函数的求和公式及Euler公式求解直链多烯和平面环多烯HMO解析式的归一化系数,描述了数学推导过程。同时,根据唐敖庆江元生图形理论公式,推导出直链多烯和环多烯HMO本征多项式系数α_t的表达式。     

非等时变分和Hlder原理

在推导Holder原理的过程中,一个关键步骤是应用非等时变分的一个基本表达式。无论从解析法出发或从图解法出发都证明了,在可变函数具有零阶接近度的情况下,这个基本表达式是不正确的,并且推导出一个与上述基本表达式不同的新的表达式。为了慎重起见,联合应用变分学和微分学来研究非等时变分,除验证了新的表达式的正确性之外,还得到一个与之等价的表达式。随后,从可变函数曲线的接近度的概念入手来进一步讨论问题,借助这一等价的表达式,证明了非等时变分的那个基本表达式在可变函数具有一阶接近度时是正确的。进一步的研究表明,在推导Holder原理的过程中还存在一个隐含的表达式,通过类似的研究证明,当可变函数曲线具有二阶接近度时,才能保证这个隐含的表达式成立。     

普通情况下的多普勒效应表达式

考虑到波源和接收器相对于介质同时沿不同方向运动,推导出普遍情况下的机械波多普勒效应表达式·基于爱因斯坦的相对性原理和光速不变原理,利用狭义相对论的时间膨胀公式,推导出光在真空中的多普勒效应表达式·这一推导方法简单明了,物理概念清晰·最后给出了应用多普勒效应表达式的两个实例·     

三次基样条插值公式的推导方法研究

三次基样条在研究微分方程和积分方程的数值解时有着许多应用。在计算机图形学中，使用三次基样条，可以应用于图形设计的数学放样中，并能取得良好的线型光顺效果。但是，几乎在各种介绍样条的书籍里都没有关于三次基样条曲线插值公式的推导。本提供了三次基样条函数表达式的一种推导方法。     

n符号动力学n—1超稳揉序剂揉特征多项式

利用Milnor-Thurston揉理论，推导出n符号动力学n-1超稳揉序列特征多项式的一个显式表达式，对于单峰，双峰及三峰等低次映射，表达式与已知的结果一致。     

抽头式梳状线带通滤波器设计

从滤波器的工作原理出发，分析了梳状线带通滤波器的结构特征，推导了抽头式输入输出结构的网络表达式，并对其进行简化等效，得到了与传统设计中使用的变换器输入输出相等效的表达式，用高频结构仿真软件HFSS进行了仿真，并通过实例设计，验证了此方法的有效性．     

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