BACKGROUND Postoperative sore throat is a common complication of anaesthesia and can lead to dissatisfaction after surgery. Many factors can contribute to postoperative sore throat and the incidence varies with the method of airway management. METHODS In this prospective observational study elective gynaecological and general surgical patients were interviewed 24 hours postoperatively to dete...

We consider a Hamiltonian theory of spherically symmetric vacuum Einstein gravity under Kruskal-like boundary conditions in variables associated with the Einstein-Rosen wormhole throat. The configuration variable in the reduced classical theory is the radius of the throat, in a foliation that is frozen at the left hand side infinity but asymptotically Minkowski at the right hand side infinity, ...

Tight reservoirs hold a vast natural gas in Ordos Basin, and efficient development of these resources can offset the energy shortage. Due to low-porosity low-permeability, hydraulic fracturing becomes necessary tap its resources. After fracturing, large amount fluid fills pore space near fracture, which will influence production. This study focused on water occurrence tight influencing factors....