This paper describes an elaborate study on obtaining Ag/PMMA(polymethyl methacrylate)leaky hollow waveguide which has a large aperture and low loss in transmitting solar energy.Through analyses and comparison,a quartz...This paper describes an elaborate study on obtaining Ag/PMMA(polymethyl methacrylate)leaky hollow waveguide which has a large aperture and low loss in transmitting solar energy.Through analyses and comparison,a quartz capillary with the inner diameter of 2 mm was chosen as hollow waveguide.We used the xenon light source,which has the similar spectrum as the sunlight to test and analyze the performance of the Ag/PMMA leakage hollow waveguide.The results are consistent with the transmitted theory of the dielectric/metal leaky type well.Meanwhile,the Ag/PMMA leaky-type hollow waveguide in this work had good qualities.Therefore,it will be a satisfactory medium for solar energy transmission.展开更多
A hardware platform using broadband antenna,oscilloscope,and spectrum analyzer is designed to receive radio frequency(RF)signals from electromagnetic radiation leakage of computers in the office environment.The proces...A hardware platform using broadband antenna,oscilloscope,and spectrum analyzer is designed to receive radio frequency(RF)signals from electromagnetic radiation leakage of computers in the office environment.The process of receiving and the processing techniques have also been given.Then,the software radio-based computing models and software algorithms are proposed to demodulate and decode the RF signals.An experimental result shows that the text information can be recovered from electromagnetic(EM)leakage wave of computer by this interception system.This architecture not only reduces the cost of the system’s hardware but also makes interception more flexible.The innovation points of this paper are recovering the video information in EM leakage wave of computers in an ordinary office environment based on public equipments and proposing the process of receiving processing techniques that only use the software radiobased computing models and software algorithms.展开更多
基金funded by the State Key Development Program for Basic Research of China(Grant No.2009CB939704)the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT0547)。
文摘This paper describes an elaborate study on obtaining Ag/PMMA(polymethyl methacrylate)leaky hollow waveguide which has a large aperture and low loss in transmitting solar energy.Through analyses and comparison,a quartz capillary with the inner diameter of 2 mm was chosen as hollow waveguide.We used the xenon light source,which has the similar spectrum as the sunlight to test and analyze the performance of the Ag/PMMA leakage hollow waveguide.The results are consistent with the transmitted theory of the dielectric/metal leaky type well.Meanwhile,the Ag/PMMA leaky-type hollow waveguide in this work had good qualities.Therefore,it will be a satisfactory medium for solar energy transmission.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.60871081,60671055,and 60771060)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Nos.20070013002 and 20070013004).
文摘A hardware platform using broadband antenna,oscilloscope,and spectrum analyzer is designed to receive radio frequency(RF)signals from electromagnetic radiation leakage of computers in the office environment.The process of receiving and the processing techniques have also been given.Then,the software radio-based computing models and software algorithms are proposed to demodulate and decode the RF signals.An experimental result shows that the text information can be recovered from electromagnetic(EM)leakage wave of computer by this interception system.This architecture not only reduces the cost of the system’s hardware but also makes interception more flexible.The innovation points of this paper are recovering the video information in EM leakage wave of computers in an ordinary office environment based on public equipments and proposing the process of receiving processing techniques that only use the software radiobased computing models and software algorithms.
