This paper mainly describes a vehicle positioning and tracking system which is based on browser, GPS and GPRS.And this system takes advantage of Baidu Map as basic material to show vehicle status, which enables drivers and supervisor to monitor the vehicle’s current and past positions.The vehicle’s location data is got from satellites, and thes
Abstract Charged particle beams can be manipulated by exploiting the channeling phenomenon in bent crystals.Two plate-like crystals, bent by mechanical holders, were manufactured and characterised for such purpose at the Sensor and Semiconductor Laboratory in Ferrara, Italy.An anticlastic curvature was obtained for these crystals, achieving a steer
Este artigo trata de uma revisão bibliográfica realizada com o objetivo de reunir e avaliar de forma exploratória informações existentes na literatura científica sobre sintomas e doenças com o potencial de serem caracterizados como decorrentes do exercício da atividade de regência ou do ambiente em que ela é realizada.Uma motivação para
Today flash floods are one of the most significant extreme weather-related natural hazards.Due to the global climate change and altered land use, intense runoff and flash floods may exert catastrophic hydrologic impacts on developed areas.To measure and observe runoff - affecting environmental factors we have calculated characteristic flow values (
A partially activated conjugate beamforming (PACB) is proposed for massive multiple-input multiple-output communications, where the line-of-sight (LoS) channel is dominant.Unlike the conventional conjugate beamforming which activates all the antenna elements to radiate the signals, our PACB activates only a fraction of the antennas by exploiting th