We study the amplification of a resonant standing-wave light field due to the interaction with a beam of monovelocity two-level atoms moving in the Raman-Nath regime and in the Bragg regime. The atomic density is low so that, at most, one atom is inside the cavity at a time. This system is very similar to the well-known micromaser but it is operating in the optical region of the field frequenci...

Install, what about 80 % rejections of contemporary weight-lifting machines bond with dynamic loading, which bring to higher shabby surface frictionless, tiredness destriction hardware and details mechanism, appearance inadmissible residual strains. That witness important calculations, without impossible create elevated degree technique – economical index. The questions reduce bridge cranes are...

ports are the most important economic, political and military bottlenecks. this puts shoreline structures (port) in the class of important structures and they have a crucial role in the countries’ life. pile and deck wharf and their access bridges and offshore deck (jetties), are one of the parts which are supplier of coupling between the land and the waterfront. correct and exact estimation of...