Photoconductive antennas deposited onto GaAs substrates that incorporate InAs quantum dots have been recently shown to efficiently generate both pulsed and CW terahertz radiation. In this Letter, we determine the operational limits of these demonstrate their extreme thermal breakdown tolerance. Implanted serve as free carrier capture sites, thus acting lifetime shorteners, similar defects in lo...

This paper presents a flexible HEN (heat exchanger network) synthesis methodology for designing multiperiod with streams involving phase changes. The is based on an MINLP (mixed integer nonlinear programming) model, identification of critical points, and flexibility index analysis considering A nominal topology constructed in the first step. Then each process operating condition’s points are ca...

background: the objectives of an educational system in a society are based on society's requirements. since personnel knowledge and skill are not qualified with the advantages of science and invention of new tools, new needs are arisen. comparing the curriculum of undergraduate course of operating room of our country with international societies, it seems that this curriculum is not a good one ...

To ensure the operation safety of landing signal officer (LSO) to pilot during carrierbased aircraft landing, the paper proposed a “LSO-pilot-aircraft” instruction associated with operation system. LSO guide mission, and design instruction associated with operation element is been analysed. The relationship and matching of “LSO-pilotaircraft” system are exhibited by instruction associated with ...

A facile and efficient method for the preparation of 1,1-diacetates of aldehydes is improved. The acidified kaolin with sulfuric acid (2 % w/w) catalyzed 1,1-diacetates formation from aldehydes in solvent-free conditions. Both aromatic and aliphatic aldehydes gave high yields (85-95 %) of the corresponding 1, 1-diacetates. Advantages of this method are the use of inexpensive and selective catal...