The phenomenon of feeding loads from any distributed generators (DGs) with a total disconnection utility grid at the point common coupling is called Islanding. DGs are usually independently controlled. Hence, when islanding problem occurs, electric loses control and supervision over that section power grid. Furthermore, prolonged can prevent reconnection to may cause damage due voltage frequenc...

Abstract There are a lot of welded joints in the shale gas collection pipeline, so failure risk production line is very high. A leak has occurred pipeline dewatering station, and order to find out causes provide technical support for safe transmission, macroscopic analysis, non-destructive testing (X-ray flaw detection), mechanical properties, metallurgical analysis were performed on failed pip...

We examined the chemical reactions influencing dissolved concentrations, speciation, and transport of naturally occurring arsenic ~As! in a shallow, sand and gravel aquifer with distinct geochemical zones resulting from land disposal of dilute sewage effluent. The principal geochemical zones were: ~1! the uncontaminated zone above the sewage plume @350 mM dissolved oxygen ~DO!, pH 5.9#; ~2! the...

We study the quench dynamics of non-Hermitian topological models with skin effects. Adopting non-Bloch band theory and projecting onto generalized Brillouin zone, we find that emergent structures, in form dynamic skyrmions, exist momentum-time domain, are correlated invariants static Hamiltonians. The skyrmion structures anchor on fixed points whose existence conditional coincidence zones pre- ...

Community detection is a task of fundamental importance in social network analysis. Community structures enable us to discover the hidden interactions among the network entities and summarize the network information that can be applied in many applied domains such as bioinformatics, finance, e-commerce and forensic science. There exist a variety of methods for community detection based on diffe...