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C. Bilel,M.M. Habchi,A. Ben Nasr,I. Guizani,A. Rebey,B. El Jani 한국물리학회 2016 Current Applied Physics Vol.16 No.3
We present a self-consistent calculation combined with the 16-band anticrossing model in order to investigate the electronic and optical properties of n-doped GaNAsBi/GaAs multiple-QWs operating at 1.55 mm. Optoelectronic features of these quantum structures seem advantageous for the design of photodetector devices. We have found that doping induces a blue shift of the fundamental transition energy for the uncoupled double-QWs with the barrier width Lb ¼ 12 nm. This transition energy shows a red shift when the doped DQWs are coupled (Lb ¼ 2 nm). An applied electric field favors further this shift. The coupling and Stark effects on the spatial distribution of confined electrons density are discussed. The absorption coefficient for the coupled 4 nm GaN.04As.89Bi.07/GaAs DQWs is enhanced compared to the undoped or uncoupled DQWs. Finally, we have examined the dependence of the absorption magnitude on the doping density and electric field for different values of wells number.
M. KHALED,M. G. ELRAB,C. HABCHI,A. ALSHAER,A. ELMARAKBI,F. HARAMBAT,H. PEERHOSSAINI 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.2
The thermal soak phase of a vehicle results from driving the vehicle at high load followed by shutting off the engine. The present work deals with the analysis and modeling of the thermal soak phase of a vehicle through temperature and heat flux measurements. Measurements are carried out on a passenger vehicle in wind tunnel S4 of Saint-Cyr-France. The underhood is instrumented by alsmot 120 surface and air thermocouples and 20 fluxmeters. Measurements are performed for three thermal functioning conditions, with the engine in operation and the front wheels positioned on the test facility with power-absorption controlled rollers. It was found that in thermal soak the temperature of certain components can increase by almost 80℃ (pre-catalyst) and that of air zones by alsmot 40℃ (crawl area). These components correspond to areas that heat up after stopping the engine for 3 to 24 minutes, depending on their position in the underhood and on the thermal operating point considered.