Hilbert空间中Bessel列的广义扰动

运用算子理论方法,研究了Hilbert空间中Bessel列的广义扰动,对Hilbert空间H中的任一Bessel列f={fi}i∞=1,给出了序列g={gi}∞i=1={α1(1)f1,α1(2)f1,α2(2)f2,α1(3)f1,α2(3)f2,α3(3)f3,…},g={gi}∞i=1={α1(1)f1,α1(2)f2,α2(2)f2,α1(3)f3,α2(3)f3,α3(3)f3,…},g={gi}∞i=1={∑∞j=1αj(i)fj}∞i=1,成为Bessel列的充分条件。     

平面双质体自同步振动机的同步理论

本文提出了平均转矩差法,并应用这种方法得出了该种机器的同步性条件(同步性判据),即 |H_α|≤1 H_α=ΔMg-ΔMf/m_α~2ω~2r~2A_α;式中其次,给出了该种机器同步运转状态的稳定性条件(稳定性判据),如下式所示:A_α>0(当cosΔα_0=0～1时)A_α<0(当cosΔα_0=0～-1时)最后,理论公式通过实验验证,结果是满意的。     

两类广义Fibonacci数列的关系

本文将研究广义Fibonacci数列｛un=un-1 un-2｝和数列｛αn=αn-1 αn-3 αn-4｝的内在关系，得到：设αn=1，α2=(m↑∑↑i=1ui s)^2,α4=(m 1↑∑↑i=2ui s)^2,α6=(m 2↑∑、i=3ui s)^2且αn=αn-1 αn-3 αn-4，则（1）α2n=(m n-1↑∑↑i=nui s)^2,α2n 1 α2n-2 α2n-3=2(m n-2↑∑↑i=n-1ui s)(m n-1↑∑↑i=nui s)(2)α2n 1=(m n-1↑∑↑i=nui s)(m n↑∑↑i=n 1ui s) (-1)^n 1X(m,s)，其中X（m,s)=(um s 1-us 1)(um s 2-us 2)-1。     

烷基氮氧自由基推拉效应的ab initio研究--I.烷基氮氧自由基的ESR波谱

研究了烷基氮氧自由基的 ESR波谱。结果表明 :室温条件下 H2 NO· ,CH3NHO· ,(CH3) 2 NO·和 (C2 H5) 2 NO·自由基均能产生 5条、7条、2 1条和 1 3条偶合分裂峰 ,相应的 H原子和 N原子与自由基单电子之间的偶合分裂常数分别为 :αH=1 1 .9,αN=1 1 .9(CH3OH中 ) ;αH=1 3.8,αN=1 3.8(CH3OH中 ) ;αH=1 2 .3,αN=1 5.2 (CCl4 中 ) ;αH=1 0 .3,αN=1 5.2 (CCl4 中 ) ;同时 ,讨论了 (C2 H5) 2 NO·在不同有机溶剂中的偶合分裂常数及可能的衰变机理     

两个极限命题的证明

用归纳法证明了两个极限命题.(1)设m>1,pi(x)(I=1,2,….m)是[1, ∞)上的连续正函数,在满足一定条件下成立lim x→ ∞[∫x 1tm-1 p1(t)p2(t)…pm(t)dt]/xmp1(x)p2(x)…pm(x)=α1α2…αm/α2α3…αm α1α3…αm … α1α2…αm-1(2)设pjn,an(j=1,2…,m;n=1,2,…;m>1)均为正数,在满足一定条件下成立lim x→ ∞(n∑k=1 am-1 k p1kp2k…pmk)/amnp1np2n…pmn=α1α2…αm/α2α3…αm α1α3…αm … α1α2…αm-1.     

两个极限命题的证明

用归纳法证明了两个极限命题。(1)设m>1,pi(x)(i=1,2,…,m)是[1, ∞)上的连续正函数,在满足一定条件下成立li mx→ ∞∫1xtm-1p1(t)p2(t)…pm(t)dtxmp1(x)p2(x)…pm(x)=α2α3…αm α1α3α…1αα2m… αm… α1α2…αm-1(2)设pjn,an(j=1,2,…,m;n=1,2,…;m>1)均为正数,在满足一定条件下成立li mn→∞∑nk=1akm-1p1kp2k…pmkanmp1np2n…pmn=α2α3…αm α1α3α…1αα2m… αm… α1α2…αm-1     

ON THE CONJECTURE OF GOLOMB(Ⅱ) 关于Golomb猜想(Ⅱ)

本文证明了: 定理1.若p=2~αoq_1~αq_2~α2…q_m~αm+1,α_0≥2,且multiply from t=1 to m qi-1/qi>2/3, 则在有限域GF(p)中,Golomb猜想成立。推论.设p=2~α0q_2~α2…q_m~αm+1,α_0≥2, ①若m=1,则当q_1>3时: ②若m=2,则当q_2>q_1>3时; ③若m=3,则当q_3>q_2>q_1>5时,在有限域GF(p)中,Golomb猜想成立。定理2.若p=2~α03~α1,α_0≥2,且模p的最小正平方非剩余不是原根,则在有限域GF(p)中,Golomb猜想成立。     

乡村振兴背景下城镇化进程与村落保护的耦合度研究

考虑到城镇化与村落保护之间存在着复杂的耦合关系,构建了城镇化与村落保护的耦合协调度模型.利用该模型定量计算了芜湖市城镇化与村落保护的耦合协调程度,并分析了其变化趋势.计算了芜湖市城镇化贡献份额α与村落保护贡献份额β在3种情况下(分别为:α=2/3,β=1/3;α=1/2,β=1/2;α=1/3,β=2/3)的耦合协调度...     

二阶脉冲微分方程Dirichlet问题非平凡解的存在性及多解性

研究了二阶脉冲微分方程Dirichlet问题{u″(t)+f(t,u(t))=0, t∈(0,1), t≠t_i,Δu|_t=ti=α_iu(t_i), i=1, 2,…,k,u(0)=u(1)=0非平凡解的存在性及多解性。其中α_i>-1, i=1, 2,…,k 为给定常数, 0=t₀12<…kk+1=1 为给定的脉冲点。Δu|_t=ti=u(t⁺_i)-u(t^-_i), u(t⁺_i), u(t^-_i)分别表示u在t=t_i处的右极限和左极限。 f∈C(［0,1］×R, R)。 本文的主要结果推广和改进了一些已有的关于二阶脉冲微分方程Dirichlet问题非平凡解的存在性及多解性的结论。 主要结果的证明基于López-Gómez在2001年建立的分歧定理。     

解四阶抛物型方程高精度恒稳的隐式格式

对四阶抛物型方程ut+uxxxx=0构造了一类三层隐式差分格式,它们含有非负参数α1,α2和α3,其局部截断误差至少是O(Δt2+Δt6).在条件α1≥α3≥0,0≤α2≤及α1+α2+α3=1之下,该格式绝对稳定且可用追赶法求解.     

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.     

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     

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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