We present a formal analysis of nonlinear response functions in terms correlation real- and imaginary-time domains. In particular, we show that causal functions, expressed nested commutators real time, can be obtained from the analytic continuation time-ordered which are more easily amenable to diagrammatic calculation. This generalizes well-known result linear theory. then use gauge invariance...

The microgrid containing a large amount of high frequency power switches and nonlinear components has put forward high requirements for power system real-time simulation technology. Multivalued coefficient prestorage can reduce the calculation steps in real-time simulation. In order to reduce the storage pressure of the multivalued coefficients, the whole network is divided into multiple subnet...

The Continuously Operating Reference Station (CORS) technique has been widely applied in land resource management, surveying, mapping, deformation monitoring, precise navigation, etc. This article analyzed the positioning method using EGM2008 and CORS of Jilin Province, China. The vertical transformation of EGM2008 from WGS84 to China's CGCS2000 datum and the horizontal coordinate transformatio...