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合法媒介与竞争黑马
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作者 李频 《出版广角》 2004年第12期8-10,共3页
刊型广告重消费性轻思想性、重信息轻观点、强产业性弱甚至去意识形态性,其处境正反映了社会转轨时期过渡性的时代性的媒介经营尴尬。
关键词 合法媒介 刊型广告 广告媒介 杂志 盈利模式 期刊竞争
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Guest Review:Potential theory method for 3D crack and contact problems of multi-field coupled media: A survey 被引量:2
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作者 陈伟球 丁皓江 《Journal of Zhejiang University Science》 CSCD 2004年第9期1009-1021,共13页
This paper presents an overview of the recent progress of potential theory method in the analysis of mixed boundary value problems mainly stemming from three-dimensional crack or contact problems of multi-field couple... This paper presents an overview of the recent progress of potential theory method in the analysis of mixed boundary value problems mainly stemming from three-dimensional crack or contact problems of multi-field coupled media. This method was used to derive a series of exact three dimensional solutions which should be of great theoretical significance because most of them usually cannot be derived by other methods such as the transform method and the trial-and-error method. Further, many solutions are obtained in terms of elementary functions that enable us to treat more complicated problems easily. It is pointed out here that the method is usually only applicable to media characterizing transverse isotropy, from which, however, the results for the isotropic case can be readily obtained. 展开更多
关键词 Potential theory method Mixed boundary value problem Multi-field coupled media
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