This paper comprehensively evaluates and analyzes the tourism resources in Jilin Province, China. And it consists of three parts. The first two parts are on the resources evaluation and analysis. Based on the results ...This paper comprehensively evaluates and analyzes the tourism resources in Jilin Province, China. And it consists of three parts. The first two parts are on the resources evaluation and analysis. Based on the results of evaluation about the structural and spatial distribution of the tourism resources, it is found that, the natural resources play fundamental roles in Jilin, while the human and cultural resources are important complementary parts as well. In the spatial distribution analysis, the resources show the characteristic of "six clusters"and "three belts"spatial relations. Four clusters are centered on the cities, which are Changchun, Jilin, Baicheng, Tonghua and Ji′an; one cluster is around the Changbai Moutains and one cluster nears the frontier at Tumen between China, Russia and P.D. R. Korea. And the three belts are: 1) The west belt. It contains Xianghai and Momoge natural protection region. The evident of this zone is its ecological and ethical tourism resources. 2)The middle belt characterized by urban traveling and recreation, including Jilin and Changchun, together with their nearby Nong′an and Siping. 3) The last belt is also the most important one, which is the east zone. It covers the Changbai Mountains, the golden triangles of Tonghua and the Tumen River. This zone is remarkable for its abundant natural landscapes and unique folk customs. In the last part the concept planning is briefly constructed for the tourism resources in Jilin Province according to the above evaluation and analysis.展开更多
The author first introduces the notion of affine structures on a ringed space and then obtains several related properties.Affine structures on a ringed space,arising from complex analytical spaces of algebraic schemes...The author first introduces the notion of affine structures on a ringed space and then obtains several related properties.Affine structures on a ringed space,arising from complex analytical spaces of algebraic schemes,behave like differential structures on a smooth manifold.As one does for differential manifolds,pseudogroups of affine transformations are used to define affine atlases on a ringed space.An atlas on a space is said to be an affine structure if it is maximal.An affine structure is said to be admissible if there is a sheaf on the underlying space such that they are coincide on all affine charts,which are in deed affine open sets of a scheme.In a rigour manner,a scheme is defined to be a ringed space with a specified affine structure if the affine structures make a contribution to the cases such as analytical spaces of algebraic schemes.Particularly,by the whole of affine structures on a space,two necessary and sufficient conditions,that two spaces are homeomorphic and that two schemes are isomorphic,coming from the main theorems of the paper,are obtained respectively.A conclusion is drawn that the whole of affine structures on a space and a scheme,as local data,encode and reflect the global properties of the space and the scheme,respectively.展开更多
文摘This paper comprehensively evaluates and analyzes the tourism resources in Jilin Province, China. And it consists of three parts. The first two parts are on the resources evaluation and analysis. Based on the results of evaluation about the structural and spatial distribution of the tourism resources, it is found that, the natural resources play fundamental roles in Jilin, while the human and cultural resources are important complementary parts as well. In the spatial distribution analysis, the resources show the characteristic of "six clusters"and "three belts"spatial relations. Four clusters are centered on the cities, which are Changchun, Jilin, Baicheng, Tonghua and Ji′an; one cluster is around the Changbai Moutains and one cluster nears the frontier at Tumen between China, Russia and P.D. R. Korea. And the three belts are: 1) The west belt. It contains Xianghai and Momoge natural protection region. The evident of this zone is its ecological and ethical tourism resources. 2)The middle belt characterized by urban traveling and recreation, including Jilin and Changchun, together with their nearby Nong′an and Siping. 3) The last belt is also the most important one, which is the east zone. It covers the Changbai Mountains, the golden triangles of Tonghua and the Tumen River. This zone is remarkable for its abundant natural landscapes and unique folk customs. In the last part the concept planning is briefly constructed for the tourism resources in Jilin Province according to the above evaluation and analysis.
文摘The author first introduces the notion of affine structures on a ringed space and then obtains several related properties.Affine structures on a ringed space,arising from complex analytical spaces of algebraic schemes,behave like differential structures on a smooth manifold.As one does for differential manifolds,pseudogroups of affine transformations are used to define affine atlases on a ringed space.An atlas on a space is said to be an affine structure if it is maximal.An affine structure is said to be admissible if there is a sheaf on the underlying space such that they are coincide on all affine charts,which are in deed affine open sets of a scheme.In a rigour manner,a scheme is defined to be a ringed space with a specified affine structure if the affine structures make a contribution to the cases such as analytical spaces of algebraic schemes.Particularly,by the whole of affine structures on a space,two necessary and sufficient conditions,that two spaces are homeomorphic and that two schemes are isomorphic,coming from the main theorems of the paper,are obtained respectively.A conclusion is drawn that the whole of affine structures on a space and a scheme,as local data,encode and reflect the global properties of the space and the scheme,respectively.
