Results 281 to 290 of about 4,561,256 (335)

The Doppler shift lifetimes facility

Hyperfine Interactions, 2013
The Doppler Shift Lifetimes chamber is an experimental facility designed to measure the mean lifetimes of excited nuclear states that decay within femtoseconds via the detection of their Doppler-shifted γ ray transitions.
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Relativistic Doppler-shift effects

Physical Review D, 1985
The lack of knowledge of relativistic distribution functions for interacting particles introduces uncertainty into the cosmological interpretation of Doppler shifts, particularly for systems such as quasars. Here we define an average Doppler shift, reducible to the nonrelativistic form in the appropriate limit.
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Resolution of overlapping Doppler shifted echoes

Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 2002
This paper considers the problem of estimating the time delays and Doppler shifts of a known waveform received via several distinct paths by an array of antennas. The general maximum likelihood estimator is presented, and is shown to require a 2d-dimensional non-linear minimization, where d is the number of received signal reflections.
Andreas Jakobsson, A. Lee Swindlehurst, Petre Stoica   +2 more
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Doppler Shift in a Plasma*

Journal of the Optical Society of America, 1967
It is first shown that the ideal electron plasma (presence of protons neglected) is unique among all dispersive media in that it does not distinguish any inertial frame of reference in terms of utility. The theory of the Doppler shift in an ideal plasma is then developed by simultaneous employment of two inertial frames of reference.
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The Doppler shift and the photon

Physics Education, 2001
The formula for the relativistic Doppler shift for light can be seen as just a special case of the apparent change in momentum of an object emitted from a receding source.
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[The application of Doppler broadening and Doppler shift to spectral analysis].

Guang pu xue yu guang pu fen xi = Guang pu, 2004
The distinction between Doppler broadening and Doppler shift has analyzed, Doppler broadening locally results from the distribution of velocities of the emitting particles, the line width gives the information on temperature of emitting particles. Doppler shift results when the emitting particles have a bulk non random flow velocity in a particular ...
Wei, Xu, Zi-shen, Fang
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Optimal sensor placement for Doppler shift target localization

International Radar Conference, 2015
A key component of cognitive radar is intelligent signal processing which encompasses an algorithmic decision-making process for adaptive transmitted waveform selection and online optimal path planning for moving radar platforms in order to deal with non-
Ngoc Hung Nguyen, K. Doğançay
semanticscholar   +1 more source

Doppler Interpretation of Quasar Red Shifts

Science, 1966
The hypothesis that the quasistellar sources (quasars) are local objects moving with velocities close to the speed of light is examined. Provided there is no observational cutoff on apparent bolometric magnitude for the quasars, the transverse Doppler effect leads to the expectation of fewer blue shifts than red shifts for an isotropic ...
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Einstein's Principle of Relativity and Doppler Shift

Physics Essays, 2007
This paper explores the possibility of detecting a difference in the Doppler Shift phenomenon when generated in different inertial frames, as a means of testing Einstein’s Principle of Relativity. Specifically, the Doppler shifts generated alternatively by movement of the observer and movement of the light source are examined and show an observable ...
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On accurate localization of sensor nodes in underwater sensor networks: a Doppler shift and modified genetic algorithm based localization technique

Evolutionary Intelligence, 2020
Amrita Datta, Mou Dasgupta
semanticscholar   +1 more source