Results 21 to 30 of about 20,191 (260)

Laryngeal Nerve Activity During Pulse Emission in the CF-FM Bat, Rhinolophus ferrumequinum. I. Superior Laryngeal Nerve (External Motor Branch) [PDF]

open access: yes, 1981
The activity of the external (motor) branch of the superior laryngeal nerve (SLN), innervating the cricothyroid muscle, was recorded in the greater horseshoe bat,Rhinolophus ferrumequinum.
Rübsamen, R., Schuller, Gerd
core   +1 more source

Cell ID and Timing Estimation Techniques for Underwater Acoustic Cellular Systems in High-Doppler Environments

open access: yesSensors, 2020
In an underwater acoustic cellular (UAC) system, underwater equipment or sensor nodes need to detect the identity of an underwater base station (UBS) and synchronise it with a serving UBS. It is known that, in an underwater acoustic channel, the temporal
Muhammad Asim   +3 more
doaj   +1 more source

Robust Underwater Acoustic Communication Using the Overlapped Chirp Spread Carrier Technique in Doubly Spread Environments

open access: yesIEEE Access, 2023
The performance of underwater acoustic communication is significantly affected by multipath propagation and Doppler spread. In this paper, we propose a new communication technique called overlapped chirp spread carrier (OCSC) by modifying the existing ...
Chang-Hyun Youn   +3 more
doaj   +1 more source

Acousto-optic frequency switching for single-camera planar Doppler velocimetry [PDF]

open access: yes, 2001
A single-camera Planar Doppler velocimetry system has been demonstrated, in which illumination beams at two closely-spaced optical frequencies are derived from a single Argon-ion laser.
Nobes, David S.   +2 more
core   +1 more source

Research of Mobile Underwater Acoustic Communication of M-Ary Combining FDM and Piecewise-LFM

open access: yesXibei Gongye Daxue Xuebao, 2019
Aiming at the countering doppler shift, a mobile underwater acoustic communication scheme of M-ary via FDM-PLFM is proposed. The cross-correlation between piecewise linear frequency modulation(PLFM) and traditional LFM signal is analyzed based on the ...

doaj   +1 more source

The Doppler effect induced by earthquakes: A case study of the Wenchuan MS8.0 earthquake

open access: yesGeodesy and Geodynamics, 2022
Seismologists have found that the first arrival frequencies of P waves at different seismic stations have different widths, that is, different periods or frequencies, and they think that this phenomenon can be used to identify whether a Doppler effect is
Qicheng Li   +3 more
doaj   +1 more source

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

open access: yes, 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
Schuller, Gerd
core   +1 more source

Doppler Stretch and Delay Statistical Performance Comparison for Wideband and Narrowband Signal Model

open access: yesИзвестия высших учебных заведений России: Радиоэлектроника, 2018
Narrowband approximation of Doppler effect by a frequency shift is inappropriate for some problems of radiolocation, hydro acoustics or passive location.
I. V. Gogolev
doaj   +1 more source

Disproportionate Frequency Representation in the Inferior Colliculus of Doppler-Compensating Greater Horseshoe Bats. Evidence for an Acoustic Fovea [PDF]

open access: yes, 1979
1. The inferior colliculus of 8 Greater Horseshoe bats (Rhinolophus ferrumequinun) was systematically sampled with electrode penetrations covering the entire volume of the nucleus. The best frequencies and intensity thresholds for pure tones (Fig.
Schuller, Gerd, Pollak, George D.
core   +1 more source

Comparison of methods for turbulence Doppler frequency shift calculation in Doppler reflectometer

open access: yes, 2023
International audienceAbstract The Doppler reflectometer (DR), a powerful diagnostic for the plasma perpendicular velocity ( u ⊥ ) and turbulence measurement, has been widely used in various fusion devices.
Feng, Xi   +18 more
core   +1 more source

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