Results 31 to 40 of about 118,769 (293)

Folded Chirp-Rate Shift Keying Modulation for LEO Satellite IoT

IEEE Access, 2019
In the low earth orbit (LEO) satellite Internet of Things (IoT), the IoT devices can be distributed in remote areas (e.g., desert, ocean, and forest) for some special applications, where they are unable to have direct terrestrial network accesses and can
Chao Yang, Mei Wang, Lin Zheng, Guangpeng Zhou   +3 more
doaj   +1 more source

Doppler-Induced Dynamics of Fields in Fabry-Perot Cavities with Suspended Mirrors [PDF]

, 2001
The Doppler effect in Fabry-Perot cavities with suspended mirrors is analyzed. Intrinsically small, the Doppler shift accumulates in the cavity and becomes comparable to or greater than the line-width of the cavity if its finesse is high or its length is
Abramovici, An, Camp, Drever, Lawrence, Rakhmanov, Robertson   +6 more
core   +3 more sources

Echo Delay and Overlap with Emitted Orientation Sounds and Doppler-shift Compensation in the Bat, Rhinolophus ferrumequinum [PDF]

, 1977
The compensation of Doppler-shifts by the bat, Rhinolophusferrumequinum, functions only when certain temporal relations between the echo and the emitted orientation sound are given. Three echo configurations were used: a) Original orientation sounds were
A. Novick, G. Schuller, G. Schuller, G. Schuller, G. Schuller, G. Schuller, G.J.A. Bird, H.-U. Schnitzler, H.-U. Schnitzler, J.-P. Legouix, J.D. Pye, N. Suga, N. Suga, V. Bruns   +13 more
core   +1 more source

Doppler shift simulation of scattered HF signals during the Tromsø HF pumping experiment on 16 February 1996 [PDF]

Annales Geophysicae, 2002
Comparisons between bistatic scatter measurements and simulation results during the Tromsø HF pumping experiment on 16 February 1996 are made. Doppler measurements of an HF diagnostic signal scattered from the field-aligned irregularities (FAIs) in
T. D. Borisova, T. D. Borisova, T. D. Borisova, N. F. Blagoveshchenska, I. V. Moskvin, M. T. Rietveld, M. J. Kosch, B. Thidé   +7 more
doaj   +1 more source

Foraging behavior and Doppler shift compensation in echolocating hipposiderid bats, I-Iipposideros bicolor and I-Iipposideros speoris [PDF]

, 1984
1. Two hipposiderid bats,H. bicolor andH. speoris, were observed in their natural foraging areas in Madurai (South India). Both species hunt close together near the foliage of trees and bushes but they differ in fine structure of preferred hunting space:
AD Grinnell, ER Buchler, G Neuweiler, G Neuweiler, G Schuller, G Schuller, G Schuller, G Schuller, G. Neuweiler, G. Schuller, H-U Schnitzler, J Habersetzer, J Habersetzer, J. Habersetzer, MB Fenton, OW Henson Jr, PH-S Jen, V Bruns, V Bruns, Y Gustafson   +19 more
core   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Optical angular momentum in a rotating frame [PDF]

, 2014
It is well established that light carrying orbital angular momentum (OAM) can be used to induce a mechanical torque causing an object to spin. We consider the complementary scenario: will an observer spinning relative to the beam axis measure a change in
Allen, Arlt, Bialynicki-Birula, Courtial, Fiona C. Speirits, Garetz, Javanainen, Lavery, MacDonald, Martin P. J. Lavery, Miles J. Padgett, Nienhuis, Okulov, Poynting, Speirits, Stephen M. Barnett, Vasnetsov   +16 more
core   +1 more source

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

New bounds of wide‐gap frequency‐hopping sequences with frequency shift

Electronics Letters, 2022
With the rapid development of radar, the phenomenon of Doppler frequency shift is not rare. Frequency shift needs to be considered in order to accurately calculate the mutual interference between signals. Meanwhile, to reduce interference to the received
Qianhui Wei, Hongyu Han
doaj   +1 more source

Rotational Doppler shift of the phase-conjugated photon

, 2011
The rotational Doppler shift of a photon with orbital angular momentum $\pm \ell \hbar$ is shown to be an even multiple of the angular frequency $\Omega$ of the reference frame rotation when photon is reflected from the phase-conjugating mirror.
A. Yu. Okulov, Abramochkin, Allen, Arlt, Baier, Basov, Beth, Bhattacharya, Bialynicki-Birula, Courtial, Courtial, Durnin, Felde, Foucault, Franke-Arnold, Garetz, Lavery, Leach, Lebedev, MacDonald, Mamaev, Nienhuis, Nowak, Okulov, Okulov, Okulov, Puppe, Shirasaki, Sipe, Sternklar, Volke-Sepulveda, Wei, Woerdemann   +32 more
core   +1 more source