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	Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文 OAI收割 Monthly Notices of the Royal Astronomical Society, 2021 作者: HXMT \| 收藏 \| 浏览/下载：59/0 \| 提交时间：2022/02/08 black hole physics Low Mass X-ray Binaries accretion accretion discs stars: individual (MAXI J1820+070) Astrophysics - High Energy Astrophysical Phenomena Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.
	Doppler-robust high-spectrum-efficiency VCM-OFDM scheme for low Earth orbit satellites broadband data transmission 期刊论文 OAI收割 IET COMMUNICATIONS, 2018, 卷号: 12, 期号: 1, 页码: 35-43 作者: Li, Jionghui; Xiong, Weiming; Sun, Geng; Wang, Zhugang; Huang, Yonghui \| 收藏 \| 浏览/下载：77/0 \| 提交时间：2018/03/02 Satellite Ground Stations Satellite Links Radio Receivers Radio Transmitters Ofdm Modulation Modulation Coding Doppler Shift Filtering Theory Doppler-robust High-spectrum-efficiency Vcm-ofdm Scheme Low Earth Orbit Satellites Broadband Data Transmission High-efficiency Satellite-ground Downlink Data Transmission System Limited Spectrum Resource Dynamic Link Conditions Orbital Motion Leo Satellite Variable Coding Modulated Orthogonal Frequency Division Multiplexing Satellite On-board Transmitter Ground Station Receiver Filtered-ofdm Signal Adjustable Codmod Spectral Efficiency Physical Layer Frame Structure Doppler Frequency Shift Compensation Future Gigabit X-band Reliable Satellite-ground Downlink Transmissions
	Extraction of internal wave amplitude from nautical X-Band radar observations CNKI期刊论文 OAI收割 2012 作者: Cha GZ(查国震); Lin MS(林明森); Shen H(申辉); He YJ(何宜军); Lv HB(吕海滨) \| 收藏 \| 浏览/下载：0/0 \| 提交时间：2024/12/18 internal wave amplitude X-Band radar nonlinear velocity remote sensing radon transform Brunt-Vislfrequency
	Extraction of internal wave amplitude from nautical X-Band radar observations 期刊论文 OAI收割 CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, 2012, 卷号: 30, 期号: 3, 页码: 497-505 作者: Zha Guozhen; Lin Mingsen; Shen Hui; He Yijun; Lu Haibin 收藏 \| 浏览/下载：27/0 \| 提交时间：2013/09/24 internal wave amplitude X-Band radar nonlinear velocity remote sensing radon transform Brunt-Vaisala frequency
	Electrical conductivity and microwave absorbing properties of nickel-coated multiwalled carbon nanotubes/poly(phthalazinone ether sulfone ketone)s composites 期刊论文 OAI收割 Polymer Engineering and Science, 2008, 卷号: 48, 期号: 5, 页码: 1007-1014 X. Feng; G. Liao; J. Du; L. Dong; K. Jin; X. Jian 收藏 \| 浏览/下载：42/0 \| 提交时间：2012/04/13 x-band frequency nanotube composites absorption black permittivity ferrite rubber permeability particles design