BACKGROUND Urinary retention is a common postoperative complication that mandates urinary catheterization. Urinary catheterization is associated with different physical, mental, and financial problems for both patients and healthcare systems. The patient inconvenience, urinary tract infections, and increase in hospital stay and expenses are common problems of urinary retention and urinary cathe...

We study the possibility that a keV-MeV mass hidden photon (HP), i.e. a hidden sector U(1) gauge boson, accounts for the observed amount of dark matter. We focus on the case where the HP interacts with the standard model sector only through kinetic mixing with the photon. The relic abundance is computed including all relevant plasma effects into the photon’s self-energy, which leads to a resona...

For the corporate world, virtual worlds (VWs) are still an unexplored land of opportunities. The fact that some big companies such as IBM and Sun Microsystems have devoted considerable funds and talent to taming the new territory has convinced others to step in. However and by the same token, the spectacular falls of some of these VWs ‘projects’ made other corporations hesitant or at least luke...