Abstract In this paper we propose a Hamiltonian approach to gapped topological phases on open att nighthawk hotspot surfaces.Our setting is an extension of the Levin-Wen model to a 2d graph on an open surface, whose boundary is part of the graph.We systematically construct a series of boundary Hamiltonians such that each of them, when combined with

Contrary to the assumption that web browsers are designed to support the user, an examination of a 900,000 distinct PCs shows that web browsers comprise a complex ecosystem with millions of addons collaborating and competing with each other.It is possible for addons to "sneak in" through third party installations or to get "kicked out" by their com

This work presents new results of a detailed geological and structural investigation focusing the easternmost Uruguayan Mesozoic magmatic occurrences related to the south Atlantic opening.Lithological descriptions, their stratigraphic relationships and complimentary lithochemical characterizations carried out in the San Miguel region (East Uruguay)

The effect of fiber volume fraction on the flexural properties of thelaminated composite test specimens constructed of two layers, one of themreinforced with glass fiber and the other layer reinforced with Kevlar fiberhas been investigated experimentally.The results illustrate that tension stress decreases with the increase infiber volume fraction

Abstract Background Medical care workers experienced unprecedented levels of workload and pressure since the outbreak of coronavirus disease 2019 (COVID-19).Little is known about its exact impact on medical care workers and related factors in China.This study aims to identify the psychological impact of COVID-19 on medical care workers in China.Met