Results 41 to 50 of about 252,409 (330)

High-Resolution, Rapid-Scan Dual-Doppler Retrievals of Vertical Velocity in a Simulated Supercell

Journal of Atmospheric and Oceanic Technology, 2019
Observation system simulation experiments are used to evaluate different dual-Doppler analysis (DDA) methods for retrieving vertical velocity w at grid spacings on the order of 100 m within a simulated tornadic supercell.
N. Dahl, A. Shapiro, C. Potvin, A. Theisen, Joshua G. Gebauer, Alexander D. Schenkman, M. Xue   +6 more
semanticscholar   +1 more source

Reverse Doppler Effect of Sound

, 2009
We report observation of reverse Doppler effect in a double negative acoustic metamaterial. The metamaterial exhibited negative phase velocity and positive group velocity.
C. Caloz, Choon Mahn Park, Chul Koo Kim, P. Markoš, Sam Hyeon Lee, Yong Mun Seo, Zhi Guo Wang   +6 more
core   +1 more source

Single camera 3D planar Doppler velocity measurements using imaging fibre bundles [PDF]

, 2006
Two frequency planar Doppler Velocimetry (2ν-PDV) is a modification of the Planar Doppler Velocimetry (PDV) method that allows velocity measurements to be made, quickly and non intrusively, across a plane defined by a laser light sheet.
Charrett, Thomas O. H., Ford, Helen D., Tatam, Ralph P.   +2 more
core   +1 more source

Velocity-selective resonance dips in the probe absorption spectra of Rb D2 transitions induced by a pump laser

, 2004
We report experimental observation of velocity-selective resonances in the Doppler-broadened probe absorption spectra of 85Rb and 87Rb D2 transitions in the presence of a strong copropagating pump laser locked to a frequency within the Doppler profile of
A. Bandyopadhyay, A. Pradhan, A. Ray, Agarwal, Agarwal, B. Ray, Bhattacharyya, Chen, Demtröder, Harris, Javan, Letokhov, MacAdam, Mandal, Moseley, N. Kar, P.N. Ghosh, S. Chakrabarti, Schlösberg, Tewari, Townes, Wielandy, Wieman, Wong, Xiao, Zhu   +25 more
core   +1 more source

Doppler W-band polarization diversity space-borne radar simulator for wind studies [PDF]

, 2018
CloudSat observations are used in combination with collocated European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis to simulate spaceborne W-band Doppler observations from slant-looking radars.
A. Battaglia, A. Battaglia, A. Illingworth, R. Dhillon   +3 more
core   +2 more sources

Fusion Detection for Networked Radar Aided by Doppler Information

Leida xuebao, 2023
Compared with single-radar systems, spatially separated networked radar usually has better detection performance due to its advantages of spatial and frequency diversities.
Chang GAO, Fengdeng GU, Junkun YAN, Tianyi JIA, Hongwei LIU   +4 more
doaj   +1 more source

Post-Newtonian Theory for Precision Doppler Measurements of Binary Star Orbits [PDF]

, 1999
The determination of velocities of stars from precise Doppler measurements is described here using relativistic theory of astronomical reference frames so as to determine the Keplerian and post-Keplerian parameters of binary systems.
Brumberg V. A., Brumberg V. A., Brumberg V. A., Damour T., Damour T., Damour T., Doroshenko O. V., Doroshenko O. V., L. M. Ozernoy, Ozernoy L. M., Ozernoy L. M., Robertson H. P., S. M. Kopeikin, Semeniuk I., Shakura N. I., Standish E. M., Taylor J. H.   +16 more
core   +3 more sources

First in-situ observation of a moving natural pyroclastic density current using Doppler radar

Scientific Reports, 2019
Pyroclastic density currents are one of the most devastating volcanic hazards. Understanding their dynamics is a key to develop successful hazard mitigation strategies.
L. Scharff, M. Hort, N. Varley
semanticscholar   +1 more source

Retrieving Doppler Frequency via Local Correlation Method of Segmented Modeling

Remote Sensing, 2021
The high accuracy radio Doppler frequency is critical for navigating a deep space probe and for planetary radio science experiments. In this paper, we propose a novel method based on the local correlation of segmented modeling to retrieve Doppler ...
Lue Chen, Jinsong Ping, Jianfeng Cao, Xiang Liu, Na Wang, Zhen Wang, Ping Zhu, Mei Wang, Haijun Man, Fei Fan, Weitao Lu, Jing Sun, Songtao Han   +12 more
doaj   +1 more source

Forward Modelling of Standing Slow Modes in Flaring Coronal Loops

, 2015
Standing slow mode waves in hot flaring loops are exclusively observed in spectrometers and are used to diagnose the magnetic field strength and temperature of the loop structure.
Antolin, P., Banerjee, D., Van Doorsselaere, T., Yuan, D.   +3 more
core   +2 more sources