The effect of carrier phase error in digital image transmission system is discussed. Code error rate and SNR with carrier phase error in Gauss white noise channel are calculated, and the transmission system is simulat...The effect of carrier phase error in digital image transmission system is discussed. Code error rate and SNR with carrier phase error in Gauss white noise channel are calculated, and the transmission system is simulated on computer.展开更多
Patterned porous silicon （PS） films were synthesised by using bydrogen ion implantation technique and typical electrochemical anodic etching method.The surface morphology and characteristics of the PS films were cha...Patterned porous silicon （PS） films were synthesised by using bydrogen ion implantation technique and typical electrochemical anodic etching method.The surface morphology and characteristics of the PS films were characterized by scanning electron microscopy （SEM）,X-ray diffraction（XRD）,and atomic force microscopy （AFM）.The efficient electron field emission with low turn-on field of about 3.5V/μm was obtained at current density of 0.1μA/cm^2.The electron field emission current density from the patterned PS films reached 1mA/cm^2 under and applied field of about 12.5V/μm.The experimental results show that the patterned PS films are of certain practical significance and are valuable for flat panel displays.展开更多
基金The Overseas Chinese Affairs Office of the State Council!(No. 93A114)
文摘The effect of carrier phase error in digital image transmission system is discussed. Code error rate and SNR with carrier phase error in Gauss white noise channel are calculated, and the transmission system is simulated on computer.
基金National Natural Science Foundation of China (60476004) Foundation of Graduate Students of East ChinaNormal University(ECNU2005) Foundation of State Key Laboratory of Advanced Technology for MaterialsSynthesis and Processing( Wuhan University of Tech
文摘Patterned porous silicon （PS） films were synthesised by using bydrogen ion implantation technique and typical electrochemical anodic etching method.The surface morphology and characteristics of the PS films were characterized by scanning electron microscopy （SEM）,X-ray diffraction（XRD）,and atomic force microscopy （AFM）.The efficient electron field emission with low turn-on field of about 3.5V/μm was obtained at current density of 0.1μA/cm^2.The electron field emission current density from the patterned PS films reached 1mA/cm^2 under and applied field of about 12.5V/μm.The experimental results show that the patterned PS films are of certain practical significance and are valuable for flat panel displays.
