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Search Results: 1 - 10 of 2589 matches for " 李德生 "
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在广义条件对称下的一类非线性扩散方程的精确解
The Exact Solutions of a Class of the Nonlinear Diffusion Equations under the Generalized Conditional Symmetry
 [PDF]

吴琼, 李德生
Pure Mathematics (PM) , 2013, DOI: 10.12677/PM.2013.35044
Abstract:
本文利用广义条件对称法讨论了一类(1 + 1)维非线性扩散方程\"\"
的精确解问题。其中,对流项\"\" 与源项 \"\"都显示的依赖于变量x,本文针对方程的扩散项 \"\"这一重要的情形,对该方程进行对称约化、分类,进而给出方程的精确解。
This paper will discuss the exact solution of (1 + 1) dimensional nonlinear diffusion equation \"\" by using the generalized conditional symmetries method. The convection term \"\" and source term \"\"are dependent on the variable x. This paper mainly discuss
渤海湾及沿岸盆地的构造格局
李德生
华东政法大学学报 , 1980,
Abstract: 渤海湾及沿岸盆地面积约20万平方公里,包括河北省,山东省北部和西部、辽宁省南部、河南省北部、天津市和北京市等陆地面积约12万7千平方公里,渤海海域面积为7万多平方公里。陆地面积大部被第四纪冲积层所覆盖。渤海最大深度为70米,平均深度为18米。这是一个大型的第三纪断陷-坳陷沉积盆地,是继大庆油田开发之后,在我国东部地区所开发的另一个重要的含油气盆地(图1)。
中国含油气盆地的基本特征
李德生
地球学报 , 1994,
Abstract: 中国的含油气盆地具有明显的三分性,即,东部主要为拉张型盆地,以渤海湾盆地为代表;西部主要为挤压型盆地,如塔里木、准噶尔等;中部四川、鄂尔多斯则为过渡型盆地。由于多旋回构造,中国的含油气盆地一般都是多旋回叠加盆地,具有复杂的油气藏类型和复合的油气聚集带。
数字地球与碳酸盐岩储层地质学
李德生
天然气工业 , 2001,
Abstract: ?数字地球就是对真实的地球及其相关现象的统一性的数字化重现与认识.“数字地球”是人类进入信息社会以来利用现代化的信息技术来整合地球科学数据资料的一项总体性的国家目标.碳酸盐岩储层具有比碎屑岩储层更为严重的非均质性.裂缝和孔洞在油气运移和开采过程中起着重要的作用.正是裂缝和孔洞的渗透作用构成了碳酸盐岩裂缝—孔洞型储层.数字地球用来整合地下地质信息、测井信息、地震信息和遥感信息等,解释出的裂缝和孔洞系统与产油气带吻合性很好.“数字地球”为碳酸盐岩储层地质学研究提供了一条新的途径.
一个Toda晶格方程的条件对称
Conditional Symmetries of a Toda Lattice Equation
 [PDF]

潘阳, 张丽华, 李德生
Advances in Applied Mathematics (AAM) , 2013, DOI: 10.12677/AAM.2013.23017
Abstract:

本文把离散的Lie点对称群分析方法应用于一个非线性微分–差分Toda晶格方程(即Toda-like晶格方程)。即首先应用Lie点对称方法约化Toda晶格方程,用以得到此方程对应的超定方程,再引入一个约化条件解超定方程,从而对该Toda晶格方程进行了相似约化,进而得到了其新的精确解。
In this paper, the discrete Lie point symmetry group analysis method is applied on a nonlinear dif- ferential-difference Toda lattice equation (i.e. a Toda-like equation), i.e. firstly, the Toda lattice equation is reduced by using Lie point symmetry to get the overdetermined equations corresponding to this Toda lattice equation, then a conditional symmetry is introduced to solve the overdetermined equations, so the similarity reduction for the Toda lattice equation is obtained, and then the new exact solutions of this Toda lattice equa- tion are obtained.

扩展的φ´/φ展开法及Sharma-Tasso-Olver方程的行波解
Generalized φ´/φExpansion Method and the Traveling Wave Solutions of the STO Equation
 [PDF]
韩园媛, 李德生, 黄婷
Pure Mathematics (PM) , 2013, DOI: 10.12677/PM.2013.33028
Abstract:
本文在原有扩展的φ′展开法基础之上,不考虑&phi满足的辅助方程,只利用方程本身来确定,进而确定方程的解。文章讨论求解了Sharma-Tasso-Olver(STO)方程,获得了STO方程的行波解和三角函数解。
This paper is about to discuss the method which is based on the generalized φ′ -expansion method, and explain how to determine &phi by the equation itself without considering the auxiliary equation to make sure the solutions of the equation. This paper discusses the Sharma-Tasso-Olver (STO) equation and obtains the traveling wave solutions and trigonometric function solutions of the STO equation.
藕合的AKNS方程的可积离散化
Integrable Discretization of the Coupled AKNS Equation
 [PDF]

王佳, 张丽华, 李德生
Advances in Applied Mathematics (AAM) , 2013, DOI: 10.12677/AAM.2013.24021
Abstract:
本文主要研究了藕合的二阶AKNS方程的可积离散化。首先对藕合的二阶AKNS方程的半离散双线性导数方程运用Hirota方法和Maple求出了其新的N-孤子解;然后通过对半离散的双线性导数方程中的时间变量进行离散化,得到全离散的双线性导数方程并对其进行了求解;最后通过适当的变换得出差分差分AKNS方程。
>This paper mainly studied the integrable discretization of the second order coupled AKNS equation. First of all, some new N soliton solutions of the semi-discrete double linear derivative equation of the second order coupled AKNS equation are got by using the Hirota method and Maple. Then, the full discrete bilinear derivative equation is obtained through the method of discrete time of the semi-discrete double linear deriva- tive equation and its N soliton solutions are found out. Finally, the difference-difference AKNS equation is obtained by an appropriate transformation.

非线性离散的Klein-Gordon方程的对称约化
Symmetries of the Discrete Nonlinear Klein-Gordon Eq-uation
 [PDF]

潘阳, 张丽华, 李德生, 潘树丰
Advances in Applied Mathematics (AAM) , 2013, DOI: 10.12677/AAM.2013.24026
Abstract:
本文把离散的Lie点对称群分析方法应用于非线性离散的Klein-Gordon方程。由于该方程不易应用李点对称进行约化,所以本文首先引入一个相似变换将其转化为易被李点对称约化的新方程,然后用李点对称方法约化新方程得到其不变解,最后再通过相似变换得到原非线性离散的Klein-Gordon方程的解。
>In this paper, the discrete Lie point symmetry group analysis method is applied on the discrete nonlinear Klein-Gordon equation. Since this equation is not easy to be reduced by Lie point symmetry method, firstly, this paper introduces a similarity transformation to change this equation into a new equation which can be reduced easily by Lie point symmetry method. Then the new equation is reduced by Lie point symmetry method and its invariant solutions are obtained. Finally, the solutions of the primal discrete nonlinear Klein- Gordon equation are acquired by the similarity transformation again.
中国深埋古岩溶
李德生,刘友元
地理科学 , 1991,
Abstract: 碳酸岩是石油与天然气的主要储集岩类之一。本文对中国深埋古岩溶发育规律及影响其发育的多种因素进行了综合论述。认为深埋古岩溶大大提高了碳酸岩储集层的孔隙性和渗透性。研究深埋古岩溶,是寻找储量丰度大、油气产能高的油气田的重要课题。
青藏高原地区低温生活污水的深度处理
李德生,程国栋
化工学报 , 2008,
Abstract: 针对青藏铁路沿线列车站段生活污水在低温(≤4℃)、缺氧条件下的处理要求及特点,研究了强化混凝、催化电氧化技术深度处理高原地区低温生活污水的机理,提出了青藏高原地区低温生活污水处理的最佳工艺组合。深度处理的研究结果表明:采用强化混凝处理技术即在投加无机絮凝剂PAC50mg?L-1后,再投加有机絮凝剂PAM0.5mg?L-1,可对COD一次性去除50%以上,之后再施以催化电氧化技术,通过电场与催化活性填料协同作用,低温生活污水的COD一次性去除率可达95%,NH3-N去除率80%左右;经此组合工艺处理,可使低温生活污水达到地面水源水质二级标准。
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