Results 1 to 10 of about 26,015,827 (334)

Cascaded rotational Doppler effect [PDF]

open access: yesOptics Letters, 2019
We propose and substantiate experimentally the cascaded rotational Doppler effect for interactions of spinning objects with light carrying angular momentum. Based on the law of parity conservation for electromagnetic interactions, we reveal that the frequency shift can be doubled through cascading two rotational Doppler processes which are mirror ...
Deng, Junhong   +3 more
openaire   +5 more sources

USE OF DIFFERENT LIBRARIES IN THE ANALYSIS OF THE DOPPLER MEASUREMENTS OF THE SEFOR REACTOR: ASSESSMENT OF THE DOPPLER EFFECT OF THE ASTRID CORE [PDF]

open access: yesEPJ Web of Conferences, 2021
For the next generation of fast reactors, global objectives are required in terms of safety, sustainability, waste minimization and non-proliferation issues. Concerning safety issues, particular efforts have been made in order to obtain core designs that
Foissy M., Rimpault G., Buiron L.
doaj   +1 more source

THE INERTIA OF LIGHT. VERIFICATION OF NEWTON’S SECOND LAW BY ACONFINED FLOW OF RADIATION IN A REFLECTIVE CAVITY

open access: yesAnales (Asociación Física Argentina), 2023
In 1904, the Austrian physicist Fritz Hasenöhrl examined by means of mental experiments the black body radiation in a reflecting cavity. By calculating the work required to keep the cavity moving at constant velocity in opposition to the radiation ...
C. M. Figueroa, S. Saracho
doaj   +1 more source

On Ultrasonic MTI Measurement of Velocity Profiles in Blood-Flow [PDF]

open access: yesModeling, Identification and Control, 1981
A theoretical analysis of Doppler frequency estimators proposed to be used in ultrasonic MTI measurements of velocity profiles in blood flow, is given. The estimators give an output in form of a single analogue voltage and the relation of the output to ...
Bjørn A.J. Angelsen   +1 more
doaj   +1 more source

Aircraft Detection Using Phase-Sensitive Optical-Fiber OTDR

open access: yesSensors, 2021
Aircraft detection plays a vital role in aviation management and safe operation in the aviation system. Phase-Sensitive Optical Time Domain Reflectometry (Φ-OTDR) technology is a prevailing sensing method in geophysics research, structure inspection ...
Yunpeng Cai   +4 more
doaj   +1 more source

The influence of frequency and amplitude modulation due to the sound source movement on radiated sound characteristics

open access: yesNihon Kikai Gakkai ronbunshu, 2021
The variation of the noise metrics of a group of sound sources due to its movement at a constant velocity along a straight track is discussed in the paper.
Yusuke MAKINO, Yasushi TAKANO
doaj   +1 more source

The evaluation of swallowing in patients with spinocerebellar ataxia and oropharyngeal dysphagia: A comparison study of videofluoroscopic and sonar doppler

open access: yesInternational Archives of Otorhinolaryngology, 2013
Sumarry Introduction: Spinocerebellar ataxia (SCA) is a degenerative disease that can cause loss of coordination of voluntary muscle movement such as that required for swallowing.
Edna Márcia da Silva Abdulmassih   +2 more
doaj   +3 more sources

Simple Experiment of Doppler Effect Using Smartphone Microfon Sensor

open access: yesJurnal Penelitian Fisika dan Aplikasinya, 2020
Doppler effect is the physical phenomena in which the emitted frequency is a source of change at a time when accepted by the detector due to relative movement of the detector towards the source of the wave or vice versa.
Adam Malik   +4 more
doaj   +1 more source

Difference in determination of surface wave magnitude of the M7.8 Kermadec Island earthquake on March 5,2021 in New Zealand

open access: yes地震科学进展, 2021
A magnitude M7.8 earthquake struck Kermadec Island,New Zealand on March 5,2021. In this study we determined surface wave magnitude using 692 stations from USGS global networks and 112 stations from China global earthquake monitoring system,then analyzed ...
Wenze Deng
doaj   +1 more source

Performance analysis of DSSS- and CSS-based physical layer for IoT transmission over LEO satellites

open access: yesETRI 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

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