Green infrastructure (GI) is ecological supporting system for the sustainable development of urban construction,and plays an important role in promoting the urban ecological economic and social development.In this pap...Green infrastructure (GI) is ecological supporting system for the sustainable development of urban construction,and plays an important role in promoting the urban ecological economic and social development.In this paper,Suzhou Dushu Lake Higher Education District is taken as an example,and landscape ecological resources in Dushu Lake Higher Education District are analyzed on the basis of field investigation.Combining with the relevant theory of green infrastructure,structure of GI in Suzhou Dushu Lake Higher Education District is analyzed and evaluated from hubs,links and sites,and the corresponding optimization strategy is put forward.展开更多
The Gauss-linking integral for disjoint oriented smooth closed curves is derived linking integrals from the Biot-Savart description of the magnetic field. DeTurck and Gluck extend this linking from 3-space <em>R...The Gauss-linking integral for disjoint oriented smooth closed curves is derived linking integrals from the Biot-Savart description of the magnetic field. DeTurck and Gluck extend this linking from 3-space <em>R</em><sup>3</sup> to <em>SU</em> (2) space of the unit 3-sphere and hyperbolic space in Minkowski <em>R</em><sup>1,3</sup>. I herein extend Gauss-linking to self-linking and develop the concept of self-dual, which is then applied to gravitomagnetic dynamics. My purpose is to redefine Wheeler’s <em>geon</em> from unstable field structures based on the electromagnetic field to self-stabilized gravitomagnetic field structures.展开更多
文摘Green infrastructure (GI) is ecological supporting system for the sustainable development of urban construction,and plays an important role in promoting the urban ecological economic and social development.In this paper,Suzhou Dushu Lake Higher Education District is taken as an example,and landscape ecological resources in Dushu Lake Higher Education District are analyzed on the basis of field investigation.Combining with the relevant theory of green infrastructure,structure of GI in Suzhou Dushu Lake Higher Education District is analyzed and evaluated from hubs,links and sites,and the corresponding optimization strategy is put forward.
文摘The Gauss-linking integral for disjoint oriented smooth closed curves is derived linking integrals from the Biot-Savart description of the magnetic field. DeTurck and Gluck extend this linking from 3-space <em>R</em><sup>3</sup> to <em>SU</em> (2) space of the unit 3-sphere and hyperbolic space in Minkowski <em>R</em><sup>1,3</sup>. I herein extend Gauss-linking to self-linking and develop the concept of self-dual, which is then applied to gravitomagnetic dynamics. My purpose is to redefine Wheeler’s <em>geon</em> from unstable field structures based on the electromagnetic field to self-stabilized gravitomagnetic field structures.
