一类特殊的本原有向图的Scrambling指数

对一类含有三个圈的本原有向图的scrambling指数进行了研究.结合本原有向图scrambling指数的定义,通过分析图的特点,利用顶点的度和集合之间的关系,通过集合的运算给出了此类图的scrambling指数及其广义scrambling指数的具体值.     

一类n阶本原有向图的scrambling指数

对一类不含哈密顿圈的本原有向图的scrambling指数进行了研究,通过分析此类图的特点,结合本原有向图scrambling指数的定义,通过集合的运算给出了此类图的scrambling指数及其广义scrambling指数.     

高炉透气性指数智能预测模型

高炉透气性指数是生产中最重要的监控参量之一,对透气性指数未来趋势的把握,于高炉操作者而言至关重要.通过支持向量机结合小波分析建立一个高炉透气性指数的预测模型,将历史四点透气性指数通过7层小波分解.使其波动范围变窄,结合相关的操作参数针对分解后的8个小波分量通过支持向量机建立8个预测子模型,最后通过预测分量的重构得到预测值.模型四点预测误差较小,并能满足高炉短期调节时限的要求.     

中国GDP指数对BDI指数的吸引力研究

BDI指数是衡量国际间贸易情况的重要指标之一,近年来中国经济的飞速发展使得其GDP指数对BDI指数的影响力与日俱增.从吸引子角度对中国GDP指数对BDI指数的吸引力进行了研究,通过拟合BDI和GDP指数的变化轨道,应用微积分分析两者吸引关系,得到GDP指数对BDI指数相应的吸引力.利用该吸引力对GDP数据构建新的BDI波动率并建立对比GARCH模型,同时考察了其它随机因素对BDI指数的作用.研究结果表明:中国GDP指数对BDI指数存在吸引力,它们间的这种关系可能成为研究经济危机的一种手段.     

高校校园绿地景观格局指数评析——以上海3所大学为例

依据景观生态异质性原理,对复旦大学、华东师范大学以及上海财经大学校园绿地系统做出了景观格局指数分析.指标体系包括多样性指数、廊道密度指数、最小距离指数、破碎化指数、分维分析等.通过定量分析得出各个校园生态质量方面的总体评价,同时对绿地系统今后的改建提出了建设性的意见.     

纳米管TUC_4C_8(S)和纳米环TC_4C_8(S)的拓扑指数

化合物、材料和药物的生物化学性质与其分子结构有密切的关联,通过化学拓扑指数的计算可了解化合物的性质.作为一类重要的化学参数,Szeged指数和修改的Szeged指数并广泛用于各类化学与制药学工程应用中.通过边划分方法,给出纳米管TUC_4C_8(S)和纳米环TC4C8(S)的若干基于距离的拓扑指数.     

一类光滑Chua’s电路的Lagrange稳定性分析

本文讨论了一类Chua’s电路的Lagrange稳定性.首先从理论上证明了该系统具有全局指数吸引域和正向不变集.通过设计适当的线性控制器,实现了平衡点的指数稳定性和周期解的指数跟踪.数值仿真验证的控制策略的有效性.     

具有较小Hyper-Wiener指数的仙人掌图

利用图变换的方法讨论仙人掌图的Hyper Wiener指数.通过比较给出仙人掌图的第二小、 第三小Hyper Wiener指数, 并刻画达到第二小、 第三小Hyper Wiener指数的极图.     

一类切换广义时滞系统的鲁棒指数镇定

对含有不确定参数的时变时滞切换广义系统的鲁棒指数容许性问题和鲁棒指数镇定问题进行了研究.通过利用自由权矩阵和平均驻留时间的方法,针对该类切换广义时滞系统,给出了其鲁棒指数容许的充分条件.在此基础上设计有记忆状态反馈控制器,利用广义系统Lyapunov稳定性理论和LMI方法,得到了使相应的闭环系统正则、无脉冲且指数稳定的充分条件.最后,通过仿真算例对该方法的有效性和可行性进行验证.     

变时滞脉冲高阶BAM神经网络的指数稳定性

研究带脉冲和时滞项的高阶BAM神经网络系统的指数稳定性.首先,通过压缩映射原理得到了系统存在唯一的平衡点的新的充分条件.其次,利用Halanay不等式和数学归纳法,得到了保证系统指数稳定的充分条件.最后,通过一个例子说明所得结果的有效性.     

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.     

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