Abstract:Self-aligned InAs quantum wires (QWRs) or three-dimensional (3-D) islands are fabricated on GaAs(331)A substrates by molecular beam epitaxy (MBE). InAs QWRs are selectively grown on the step edges formed by GaAs layers. The surface morphology of InAs nanostructures is carefully investigated by atomic force microscopy (AFM) measurements. Different growth conditions, such as substrate temperature, growth approach and InAs coverage, exert a great effect on the morphology of InAs islands. Low substrate temperatures prefer to the formation of wire like nanostructures while high substrate temperatures favor for 3-D islands. The shape transition is attributed to the tradeoff between surface energy and strain energy.

Abstract:By using a model of the car and the ground in RadTherm and setting reasonable parameters of environment, car and ground, the simulation was carried out. The temperature field and IR radiation field of the car and the background were calculated and IR images were obtained at different time of one day.

Abstract:A space-borne imaging Fourier transform spectrometer is used to acquire infrared radiometric spectrum with high resolution on geostationary orbit and to provide vapor, wind, temperature and trace gas profiling and vertical character by mathematic reverse translation. Calibration is one of the key technologies to the instrument. The calibration precision and accuracy reflect the quality of the instrument and its application level of remote sensing information. This paper describes the current status of the calibration of infrared and visible channels for polar or geostationary orbit instruments. Some calibration problems and corresponding solutions of present Goes series satellites are also discussed.