共查询到20条相似文献,搜索用时 62 毫秒
1.
张申贵 《吉林师范大学学报(自然科学版)》2013,34(1):16-20
研究非自治n维Duffing系统周期解的存在性问题.在具有部分周期位势和次线性非线性项时,将这类系统的周期解转化为定义在一个适当空间上泛涵的临界点,然后利用临界点理论建立了此类系统周期解的存在性结果 . 相似文献
2.
周智 《济南大学学报(自然科学版)》1988,(4)
研究抽象空间微分方程周期解的存在性一直是比较困难的一个问题,Klaus Deimling于1985—1986年利用耗散性及紧性条件研究了这一问题解的存在性。本文从另外一个角度研究了赋范线性空间l~p中周期边值问题解的单调逼近,提出了计算解的具体方法。 相似文献
3.
张环环 《吉首大学学报(自然科学版)》2015,36(5):16-20
研究了非自治共振二阶系统周期解的存在性问题.在非线性项次线性增长时,将这类系统的周期解转化为定义在一个适当空间上泛函的临界点,然后利用临界点理论建立了此类系统周期解的存在性结果. 相似文献
4.
张环环 《甘肃联合大学学报(自然科学版)》2015,29(2)
研究非自治离散Hamiltonian系统周期解的存在性问题.在非线性项次线性增长时,将这类系统的周期解转化为定义在一个适当空间上泛函的临界点,然后利用临界点理论建立了此类系统周期解的存在性结果. 相似文献
5.
张申贵 《贵州师范大学学报(自然科学版)》2013,31(1):48-52
研究了非自治二阶离散Hamilton系统周期解的存在性问题。在非线性项是次线性增长时,将这类Hamil-ton系统的周期解转化为定义在一个适当空间上泛函的临界点,然后利用临界点理论建立了此类系统周期解的存在性结果。 相似文献
6.
对空间齐性Nagumo方程,用Adams-Bashforth差分格式离散时间变量,获得了周期1解,周期2解,周期3解的存在性和线性稳定的参数区域. 相似文献
7.
张申贵 《西南师范大学学报(自然科学版)》2012,37(9):13-18
研究了二阶非自治离散Hamiltonian系统周期解的存在性.在非线性项是线性增长时,将这类Hamiltonian系统的周期解转化为定义在一个适当空间上泛函的临界点,然后利用临界点理论建立此类系统周期解的存在性结果. 相似文献
8.
Banach空间二阶微分方程的周期解 总被引:10,自引:4,他引:6
李永祥 《西北师范大学学报(自然科学版)》1998,34(2):10-13
研究了有序Banach空间中二阶微分方程周期解的存在性,利用凸锥理论与上、下解方法获得了周期解的存在性结果,并把Leela关于二阶常微分方程的结果推广到了无限维空间. 相似文献
9.
本文研究了Banach空间的全局同胚理论,作为应用给出了周期扰动守恒系统存在唯一周期解的充分条件,推广了关于全局同胚理论和上述系统解存在唯一的一些结果. 相似文献
10.
张申贵 《吉首大学学报(自然科学版)》2014,35(5):1-5
研究测度链上非自治二阶Hamilton系统周期解的存在性问题.在非线性项次线性增长时,将这类系统的周期解转化为定义在一个适当空间上泛函的临界点,然后利用临界点理论建立了此类系统周期解的存在性结果. 相似文献
11.
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. 相似文献
12.
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. 相似文献
13.
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。 相似文献
14.
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. 相似文献
15.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
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- 相似文献
16.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
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- 相似文献
17.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
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 相似文献
18.
《上海师范大学学报(自然科学版)》2014,(5):550
<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 相似文献
19.
20.
《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献