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After five and a half years construction, the main structure of Five-hundred-meter Aperture Spherical radio Telescope (FAST) has been completed in September 2016. Meanwhile, a Radio Quiet Zone (RQZ) with radius 30 km has also been established. In order to evaluate the Radio Frequency Interference (RFI) influence from the mobile base stations within radius 5 km (the restriction zone of RQZ) around...
Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project to build the largest single dish radio telescope in the world. The first light of FAST is expected in September 2016. Due to the high sensitivity of FAST, it is very sensitive to the radio frequency interference coming from the electrical and electronic equipments of telescope itself. In order to assure...
This paper reports the application of Hilbert Huang transform (HHT) to analyze piezo-actuated Lamb waves simulated numerically using finite element method. Pure Aomicron mode, pure Somicron mode and mixed Aomicron and Somicron modes have been actuated and their responses in different flight distances are recorded. Energy-time spectra of HHT are used to extract the arrival times of these signals, from...
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