一种新的拓扑指数用于饱和链烃类化合物的相关性的研究

从邻接矩阵和距离矩阵,维纳指数(W),分子的路径数(Pn)或1阶分子连接性指数(1X)的最优子集出发,结合矩阵的运算方法,定义了一个新的拓扑指数ZX来研究饱和链烷烃的沸点(Tb),标准生成焓(△fH0m),标准生成熵(S0m),标准吉布斯自由能(△fG0m),具有良好的性质相关性,相关系数(r)均大于0.99.     

PKS2155-304的爆发性质

利用收集到的PKS2155-304的1977年以后的光学资料,讨论了起光变性质.该源的最大光变和色指数分别为△U=1m.5;△B=1m.65;△V=1m.85;△R=1m.25;△I=1m.14;(B-V)=0.30±0.06;(U-B)=-0.72±0.08;(B-R)=0.62±0.07;(V-R)=0.32±0.04.对于两个观测资料丰富的爆发(1991和1994),作者具体分析了谱指数与亮度之间的关系.在爆发峰期,谱是平的且没有明显的变化.有趣的是在爆发初期谱随亮度明显变化,本文对这种依赖性给予了一些解释.     

一类有向图的星边弧染色

提出了有向图的星边弧染色的概念,并定义了有向图D的星边弧色数,记为(→x)s′(D).运用Lovász局部引理证明了若有向图D=(V,A)的最大出度△+与最大入度A-满足线性关系△+=k△-(△(D)≥7,k＞0),则(→x)s′(D)≤16[(√1+k2)/1+k△3/2]*,这里[*]*表示上取整.     

一类关于二元样条函数空间S_k~u的非贯穿协调剖分(摘要)

本文给出了一类保证非蜕化的S_k~μ存在的非贯穿协调剖分。设D是单连通域,△是D上的剖分。如果存在非蜕化的二元样条函数f(x,y)∈S_k~μ(△,D),则称△是关于S_k~μ的协调剖分, 引理1 设D是单连通域,D上的无贯穿线的单网点剖分△_0是关于S_k~μ的协调剖分的重要条件是△_0的网线条数N>(K 1)/(K-μ) 引理2 设△是单连通域D上的一个剖分,A是其中的一个网点,B(A)有m个胞腔,其中n-1个彼此相连接的胞腔上的S_k~μ中的二元样条函数待定(n相似文献   

拓扑指数mP在预测无机物理化性质中的应用

受Randic分子连接性拓扑指数mX的启发,构建了拓扑指数mP.用mP的0和1阶指数分别与20种碱金属卤化物的生成焓ΔfH(○-)m、离子水化能ΔhG(○-)m、晶格能U1、气态碱金属卤化物核间距R0,20种碱土金属卤化物的晶格能U2,51种金属离子水合焓ΔhH(○-)m和80种离子标准生成焓ΔfH(○-)m关联,拟合的回归方程的相关系(指)数为0.975 3(0.983 4)、0.976 1(0.981 6)、0.996 4(0.998 6)、0.996 7(0.996 7)、0.978 9(0.989 0)、0.990 1和0.980 5,满足优级或良级标准.预测取得较好的结果.     

亚纯函数的正规族和微分多项式的例外函数

主要证明了定理:设F是单位圆盘△上的亚纯函数族,F中的任一函数f的极点是重级的,零点重级至少为m 1,m是正整数,h(z)≠0,a0,a1,…,am-1都是D上的全纯函数.如果对任一f∈F,L(f)(z)=f(m)(z) am-1(z)f(m-1)(z) … a1(z)f′(z) a0(z)f(z)≠h(z),z∈D,则F在D上正规.     

福建三明小湖赤枝栲群落组成结构及物种多样性分析

调查三明小湖赤枝栲自然保护区的 41个 10m× 10m样方 ,共 410 0m2 的群落面积 ,测定群落物种多样性特征 ,得到Margalef丰富度指数D1=14.5 6 14;Shannon Wiener多样性指数D2 =5 .4336 ;Simpson多样性指数D3 =0 .95 6 6 ;种间相遇几率PIE =0 .95 6 7;均匀度J =0 .7788.探讨乔木层、灌木层、及藤本的物种多样性特征值 ,其变化趋势与群落总多样性一致 .分析群落中 12个主要乔木种群的年龄结构 ,揭示群落乔木层主要建群种呈稳定型 ,表明该群落正处于相对稳定的群落演替阶段     

甲烷卤代物热力学性质的拓朴指数计算

定义化学键特征值为iδj=|xi-xj|/(ni nj)0.85,分子化学键电负性连接指数nmY=∑(iδ.jδ…)。用0Y、(10Y)0.5和(33Y)0.25回归计算了70个甲烷卤代物的标准生成焓和生成自由能;单参数相关系数为0.997 6和0.998 2,三参数相关系数为0.999 0和0.998 6。     

空间单质体与双质体自同步振动机的同步理论

本文用平均转矩差法研究了空间单质体与双质体自同步振动机的同步理论,对下列问题予以考虑: 1.自同步振动机的同步性条件; 2.振动阻尼对振动机同步性条件与同步运转状态稳定性的影响; 3.两电动机转矩差(△Mg)与两转轴上的摩擦转矩差(△M_f)对振动机工作的影响。 求得同步性判据为 |D_a|≥1,D_a=m_0~2φ~2r~2W/△M_g-△M_f 式中,D_a——同步性指数; W——稳定性指数; m_0、r——偏心质量及其偏心距; φ——角速度。 并求得同步运转状态的稳定性判据为 Wcos△α_0≥0 即 W≥0 (当△a_0=-90°～90°) W≤0 (当△α_0=90°～270°) △α_0为两偏心质量的相位差角。 自同步振动机的稳定性指数W,当振动机为空间单质体和空间双质体时其表达式分别为式(21)及式(54)。上述判别式通过实验验证,结果是满意的。     

一类多变量解析函数的值分布与BMO域

设△~n为C~n中的单位多圆柱,本文定义了BMO A(△~n)函数.设D是C中的一个区域,若△~n上的解析函数,满足f(△~n)(?)D,有f∈BMO A(△~n),则称D为n-BMO域.本文得到了BMO A的计数函数是一致有界的;D是n-BMO域,当且仅当D是BMO域.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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