选取了某条拟建220 k V输电线路为研究对象,对6种不同架设方式下,线路产生的电磁环境影响大小进行了理论预测和分析。结果表明,混压线路随着叠加的电压等级的降低,产生的电场强度逐渐下降,允许最低线高逐渐降低;并行线路电场强度最大值...选取了某条拟建220 k V输电线路为研究对象,对6种不同架设方式下,线路产生的电磁环境影响大小进行了理论预测和分析。结果表明,混压线路随着叠加的电压等级的降低,产生的电场强度逐渐下降,允许最低线高逐渐降低;并行线路电场强度最大值出现在塔基横担外侧。预测结果为电磁辐射环境管理提供了理论依据和技术支撑。展开更多
In this paper, similarity symplectic geometry for curves is proposed and studied. Explicit expressions of the symplectic invariants, Frenet frame and Prenet formulae for curves in similarity symplectic geometry are ob...In this paper, similarity symplectic geometry for curves is proposed and studied. Explicit expressions of the symplectic invariants, Frenet frame and Prenet formulae for curves in similarity symplectic geometry are obtained by using the equivariant moving frame method. The relationships between the Euclidean symplectic invariants, Frenet frame, Frenet formulae and the similarity symplectic invariants, Frenet frame, Frenet formulae for curves are established. Invariant curve flows in four-dimensional similarity symplectic geometry are also studied. It is shown that certain intrinsic invariant curve flows in four-dimensional similarity symplectic geometry are related to the integrable Burgers and matrix Burgers equations.展开更多
文摘选取了某条拟建220 k V输电线路为研究对象,对6种不同架设方式下,线路产生的电磁环境影响大小进行了理论预测和分析。结果表明,混压线路随着叠加的电压等级的降低,产生的电场强度逐渐下降,允许最低线高逐渐降低;并行线路电场强度最大值出现在塔基横担外侧。预测结果为电磁辐射环境管理提供了理论依据和技术支撑。
基金supported by National Natural Science Foundation of China(Grant Nos.11471174 and 11101332)Natural Science Foundation of Shaanxi Province(Grant No.2014JM-1002)the Natural Science Foundation of Xianyang Normal University of Shaanxi Province(Grant No.14XSYK004)
文摘In this paper, similarity symplectic geometry for curves is proposed and studied. Explicit expressions of the symplectic invariants, Frenet frame and Prenet formulae for curves in similarity symplectic geometry are obtained by using the equivariant moving frame method. The relationships between the Euclidean symplectic invariants, Frenet frame, Frenet formulae and the similarity symplectic invariants, Frenet frame, Frenet formulae for curves are established. Invariant curve flows in four-dimensional similarity symplectic geometry are also studied. It is shown that certain intrinsic invariant curve flows in four-dimensional similarity symplectic geometry are related to the integrable Burgers and matrix Burgers equations.
