Results 51 to 60 of about 14,072,652 (376)
Sharing a common origin between the rotational and linear Doppler effects [PDF]
Laser Photonics Rev. 2017, 1700183, 2019 The well-known linear Doppler effect arises from the linear motion between source and observer, while the less well-known rotational Doppler effect arises from the rotational motion. Here, we present both theories and experiments illustrating the relationship between the rotational and linear Doppler effects.
arxiv +1 more source
Performance analysis of DSSS- and CSS-based physical layer for IoT transmission over LEO satellites
ETRI Journal, 2022 To determine a suitable waveform for Internet of Things (IoT) transmission over low-Earth orbit (LEO) satellites, this paper reports the results of a performance comparison between chirp spread spectrum (CSS)-based LoRa and direct sequence spread ...
Sooyeob Jung +5 more
doaj +1 more source
High-sensitive acquisition method of GPS signal based on iridium assistance
The Journal of Engineering, 2019 Global positioning system (GPS) signal is severely attenuated in indoor, urban, and forest environments. To capture weak GPS signal, long-time coherent integration and non-coherent integration are used to increase signal to noise ratio (SNR).
Hao Zihuan, Zhang Lei
doaj +1 more source
The Maximum Doppler Effect [PDF]
Journal of Nuclear Science and Technology, 1967 The maximum numerical values of the Doppler coefficient of a single Breit Wigner resonance and the dilutions for which the stationary values occur have been found as a function of temperature. The results are tabulated in terms of parameters which are independent of the particular resonance and model.
T. S. Horner, A. Keane
openaire +2 more sources
The geometrical origin of the Doppler factor in the Lienard-Wiechert potentials [PDF]
, 2021 We present an in depth analysis and a new derivation of the Doppler factor in the Lienard-Wiechert potentials, based on geometrical considerations in Minkowski space. We argue that, contrary to a common assumption, the methods used for deriving the Doppler factor in the case of an electrically charged extended particle are not applicable in the case of
arxiv +1 more source
Teaching the Doppler effect in astrophysics [PDF]
European Journal of Physics, 2017 9 pages, 5 figures, published in Eur.
Michael J. Cowley +2 more
openaire +4 more sources
Derivation of general Doppler effect equations
JOURNAL OF ADVANCES IN PHYSICS, 2020 In this paper, we will derive the general equations for Doppler effect. It will be proved that regardless of the nature of the emitted waves and the medium through which the waves propagate the formula always has the same form and is identical to the ...
Miloš Čojanović
semanticscholar +1 more source
Journal of Applied Polymer Science, Volume 140, Issue 2, January 10, 2023., 2023 Abstract The characteristic time periodicity τ* and the spatial characteristic wavelength λ of extrusion flow instabilities of a linear and a branched commercial polyethylene (PE) are characterized via capillary rheology, optical analysis and modeled. The two investigated polyethylenes have the similar weight average molecular weight (Mw).
Christos K. Georgantopoulos +4 more
wiley +1 more source
FREQUENCY DISCRIMINATOR FOR AIRCRAFT RADIONAVIGATION DOPPLER SYSTEM BASED ON MICROCONTROLLER
Измерение, мониторинг, управление, контроль, 2021 Background. The object of the study is an aircraft radio navigation system. The subject of this research is the methodology for constructing an airborne radio navigation system based on the Doppler effect.
I.V. Aksenov, V.M. Chaikovsky
doaj +1 more source
Rotational Doppler effect in left-handed materials [PDF]
Physical Review A 78, 033805 (2008), 2008 We explain the rotational Doppler effect associated with light beams carrying with orbital angular momentum in left-handed materials (LHMs). We demonstrate that the rotational Doppler effect in LHMs is unreversed, which is significantly different from the linear Doppler effect. The physics underlying this intriguing effect is the combined contributions
arxiv +1 more source