期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
组织边界及部门间边界机理研究 被引量:5
1
作者 田也壮 方淑芬 《系统工程学报》 CSCD 2000年第4期389-393,共5页
经济组织都是存在边界的 .组织的内部与外部存在边界 ;组织内部门之间也存在一定的边界 .组织边界的存在是组织塑性的一种表现 .同时也是组织塑性机理产生的作用及其他组织塑性表现的一种基础性的支持 .本文对组织边界及部门间边界机理... 经济组织都是存在边界的 .组织的内部与外部存在边界 ;组织内部门之间也存在一定的边界 .组织边界的存在是组织塑性的一种表现 .同时也是组织塑性机理产生的作用及其他组织塑性表现的一种基础性的支持 .本文对组织边界及部门间边界机理进行研究 ,讨论了组织边界下的壁垒、组织膜及渗透。 展开更多
关键词 组织边界 经济组织 组织部门 边界机理 企业组织
下载PDF
煤层气藏边界及其封闭机理 被引量:10
2
作者 苏现波 林晓英 +1 位作者 柳少波 宋岩 《科学通报》 EI CAS CSCD 北大核心 2005年第B10期117-120,共4页
在对国内外典型煤层气藏解剖的基础上,根据煤层气藏的定义,将其边界区分为4种类型:水动力边界、风氧化带边界、物性边界和断层边界.指出水动力边界和风氧化带边界具有普遍性;将油气领域断层的4种封闭机理(胶结作用、泥岩涂抹、对接... 在对国内外典型煤层气藏解剖的基础上,根据煤层气藏的定义,将其边界区分为4种类型:水动力边界、风氧化带边界、物性边界和断层边界.指出水动力边界和风氧化带边界具有普遍性;将油气领域断层的4种封闭机理(胶结作用、泥岩涂抹、对接关系和碎裂作用)引入到煤层气藏封闭性断层边界研究,并探讨了各自作用机理和相互关系;开放性断层的封闭机理与水动力封堵一致;首次将物性边界的封闭机理区分为排驱压力封闭和烃浓度封闭.不同地质背景下的煤层气藏具有不同的边界组合类型,进而构成了煤层气藏的多样性. 展开更多
关键词 煤层气藏 边界封闭机理 水动力封堵 断层边界 物性封闭 排驱压力 封闭机理 边界 风氧化带 组合类型
原文传递
Thermal-hydro-mechanical coupling stress intensity factor of brittle rock 被引量:3
3
作者 李鹏 饶秋华 +1 位作者 李卓 敬静 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期499-508,共10页
A new calculation formula of THM coupling stress intensity factor was derived by the boundary collocation method, in which an additional constant stress function was successfully introduced for the cracked specimen wi... A new calculation formula of THM coupling stress intensity factor was derived by the boundary collocation method, in which an additional constant stress function was successfully introduced for the cracked specimen with hydraulic pressure applied on its crack surface. Based on the newly derived formula, THM coupling fracture modes (including tensile, shear and mixed fracture mode) can be predicted by a new fracture criterion of stress intensity factor ratio, where the maximum axial load was measured by self-designed THM coupling fracture test. SEM analyses of THM coupling fractured surface indicate that the higher the temperature and hydraulic pressure are and the lower the confining pressure is, the more easily the intergranular (tension) fracture occurs. The transgranular (shear) fracture occurs in the opposite case while the mixed-mode fracture occurs in the middle case. The tested THM coupling fracture mechanisms are in good agreement with the predicted THM coupling fracture modes, which can verify correction of the newly-derived THM coupling stress intensity factor formula. 展开更多
关键词 stress intensity factor thermal-hydro-mechanical coupling boundary collocation method fracture mechanism brittle rock
下载PDF
Mechanism of Breakdown in Laminar-Turbulent Transition of Incompressible Boundary Layer on a Flat Plate 被引量:10
4
作者 唐洪涛 罗纪生 周恒 《Transactions of Tianjin University》 EI CAS 2007年第2期79-87,共9页
Temporal mode direct numerical simulation was done for the process of laminar-turbulent transition in an incompressible boundary layer on a flat plate. The analysis of the results showed that during the breakdown proc... Temporal mode direct numerical simulation was done for the process of laminar-turbulent transition in an incompressible boundary layer on a flat plate. The analysis of the results showed that during the breakdown process of laminar-turbulent transition, the modification of the mean flow profile by the disturbances led to a remarkable change in its stability characteristics, manifested in the significant enlargement of the linear unstable zone and the maximum amplification rate, and led to that many more disturbances were excited and enhanced rapidly, correspondingly the turbulent energy also increased rapidly, and the mean flow profiles evolved swiftly from laminar to turbulent. It was also found that if the oblique waves in the initial disturbances did not form symmetrical pairs, the subsequent span-wise mean velocities would, in general, be nonzero due to nonlinear interaction, which would have a great effect on the stability characteristics and also implied that the turbulence obtained by direct numerical simulation might not be fully a random process. 展开更多
关键词 boundary layer TRANSITION direct numerical simulation BREAKDOWN
下载PDF
Homotopic Mapping Solving Method for Perturbed Mechanism of Western Boundary Undercurrents in Equator Pacific 被引量:1
5
作者 MO Jiaqi WANG Hui LIN Wantao 《Chinese Geographical Science》 SCIE CSCD 2006年第4期347-350,共4页
The perturbed boundary undercurrent is an exceptional event in the tropical atmosphere and ocean. It is a complicated nonlinear system. Its appearance badly affects not only natural conditions such as climate and envi... The perturbed boundary undercurrent is an exceptional event in the tropical atmosphere and ocean. It is a complicated nonlinear system. Its appearance badly affects not only natural conditions such as climate and environment, but also global economic development and human living, and brings about many calamities. Thus there is very attractive study on its rules in the international academic circles. Many scholars made more studies on its local and whole behaviors using different methods, such as self-anamnestic principle, Fokker-Plank Equation method, higher order singular pedigree and predictable study, rapid change on boundary, indeterminate adaptive control, multi-eogradient method and so on. Nonlinear perturbed theory and approximate method are very attractive studies in the international academic circles. Many scholars considered a class of nonlinear problems for the ordinary differential equation, the reaction diffusion equations, the boundary value of elliptic equation, the initial boundary value of hyperbolic equation, the shock layer solution of nonlinear equation and so on. In this paper, a class of perturbed mechanism for the western boundary undercurrents in the equator Pacific is considered. Under suitable conditions, using a homotopic mapping theory and method, we obtain a simple and rapid arbitrary order approximate solution for the corresponding nonlinear system. For example, a special case shows that using the homotopic mapping method, there is a high accuracy for the computed value. It is also provided from the results that the solution for homotopic mapping solving method can be used for analyzing operator for perturbed mechanism of western boundary undercurrents in the equator Pacific. 展开更多
关键词 undercurrent PERTURBATION approximate solution equator Pacific
下载PDF
Effect of electromagnetic boundary condition on dynamo actions
6
作者 XU MingTian 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第4期75-83,共9页
In this paper, based on the mean field dynamo theory, the influence of the electromagnetic boundary condition on the dynamo actions driven by the small scale turbulent flows in a cylindrical vessel is investigated by ... In this paper, based on the mean field dynamo theory, the influence of the electromagnetic boundary condition on the dynamo actions driven by the small scale turbulent flows in a cylindrical vessel is investigated by the integral equation approach. The numerical results show that the increase of the electrical conductivity or magnetic permeability of the walls of the cylindrical vessel can reduce the critical magnetic Reynolds number. Furthermore, the critical magnetic Reynolds number is more sensi- tive to the varying electrical conductivity of the end wall or magnetic permeability of the side wall. For the anisotropic dynamo which is the mean field model of the Karlsruhe experiment, when the relative electrical conductivity of the side wall or the rel- ative magnetic permeability of the end wall is less than some critical value, the m=l (m is the azimuthal wave number) mag- netic mode is the dominant mode, otherwise the m=0 mode predominates the excited magnetic field. Therefore, by changing the material of the walls of the cylindrical vessel, one can select the magnetic mode excited by the anisotropic dynamo. 展开更多
关键词 dynamo action mean field dynamo theory electromagnetic boundary condition
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部