four-dimensional spacetime
- 网络四维时空
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GIS application to construction and production in mines is analyzed . Data storage structure of GIS is emphatically studied . Four-dimensional spacetime data structure is integrated with mine production .
分析了GIS在矿山建设和生产管理中的综合应用,着重研究了GIS中的数据存贮结构,将四维时空数据结构与矿井生产相联系,并探讨了矿山GIS所包含的内容。
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We find that the probability for the Yang-Mills baby universe to undergo a spontaneous compactification down to a four-dimensional spacetime is greater than that to remain in the original homogeneous multidimensional state .
我们发现仅对于Yang-Millsbaby宇宙,流形紧致到四维时空的几率才可能最大。
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Secondly , we investigate the energy density produced by a state vector which is the superposition of three single electron states in the Dirac field in the four-dimensional Minkowski spacetime .
然后,研究了在四维平直时空下三个单粒子态构成的量子态的负能密度。