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Time-frequency decomposition has been widely used to analyze those long periodic signals in solar physics. Empirical mode decomposition (EMD) is the popular methods to decompose them from time domain to time-frequency domain. However, the approach brings mode mixing in cycle decomposition and can cause inaccurate results and conclusion in solar physics. In this paper, a new time-frequency decomposition...
In this presentation, we proposed an all-optical broadband THz modulator based on single-layer graphene (SLG) on silicon. By illuminating the film with CW laser, the THz transmission decreased significantly. The modulation speed was measured at 340GHz to be as high as 0.5 MHz. This modulator has huge potential for real application.
Nitrogen-doped anatase nanoparticles were synthesized by a two-step wet chemical method. The N element is proved to be incorporated into the lattice of with an average concentration of 3.3 at%. Magnetic measurements show that the undoped is ferromagnetic at room-temperature (RT), which can be ascribed to a universal ferromagnetism (FM) in nanoparticles of...
This paper describes the jitter of output pulse front edge with input noise, modulation and demodulation noise, phase noise of local oscillators and channel noise for AM and FM pulse transmission systems. The analytical results show that the total jitter of system output pulse front edge includes three parts: input jitter, IF jitter and RF jitter, which can be regarded as the foundation of design...
This paper describes the Allan variance of output reference signal with phase noise of input reference signal, modulation and demodulation noise, phase noise of local oscillators and channel noise for narrowband and FM narrowband reference signal transmission systems. The analytical results show that the total Allan variance of output reference signal includes three parts: input Allan variance, IF...
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