Results 191 to 200 of about 2,028,482 (219)

Analysis of Sound Spectrographic Pattern for Assessment of Vascular Occlusive Disorders by Continuous Wave Ultrasonic Doppler Flowmeter

Analysis of Sound Spectrographic Pattern for Assessment of Vascular Occlusive Disorders by Continuous Wave Ultrasonic Doppler Flowmeter
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Advancing bridge resilience: a review of monitoring technologies for flood-prone infrastructure. [PDF]

Open Res Eur
Buka-Vaivade K, Nicoletti V, Gara F.
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Spatially distributed atmospheric boundary layer properties in Houston - A value-added observational dataset. [PDF]

Sci Data
Lamer K, Mages Z, Treserras BP, Walter P, Zhu Z, Rapp AD, Nowotarski CJ, Brooks SD, Flynn J, Sharma M, Klein P, Spencer M, Smith E, Gebauer J, Bell T, Bunting L, Griggs T, Wagner TJ, McKeown K.   +18 more
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Solar eclipse effects in the ionosphere observed by continuous Doppler sounding

Advances in Space Research, 2018
Abstract The ionospheric response to the solar eclipses of 20 March 2015 above the Czech Republic, 9 March 2016 above Taiwan, and 26 February 2017 above South Africa was studied. A distinct bipolar pulse was observed in ionospheric Doppler shift measurements above the Czech Republic (Central Europe) and above Taiwan (Eastern Asia).
Jaroslav Chum, Daniel Kouba, Zbysek Mošna   +2 more
exaly   +3 more sources

Ionospheric oscillations caused by geomagnetic Pi2 pulsations and their observations by multipoint continuous Doppler sounding; first results

Advances in Space Research, 2009
Abstract In 2004, we started operating a continuous Doppler sounding system to investigate ionospheric signatures of infrasonic, short period acoustic gravity waves and geomagnetic pulsations. Since January 2007, four stable 3.59 MHz transmitters have been in operation in the western part of the Czech Republic.
Josef Bochniček, Jaroslav Chum, Pavel Hejda   +2 more
exaly   +2 more sources

Continuous sound wave Doppler SODAR for short range wind velocity detection

2008 Asia Simulation Conference - 7th International Conference on System Simulation and Scientific Computing, 2008
The authors propose a Doppler SODAR system to detect wind velocity by the frequency shift between the emanation and reception in continuous wave. The proposal is certificated by the simulation of acoustic wave propagation with discrete Huygenpsilas modeling. The experiment verifies the SODAR system which provides reasonable result.
null Lingyun Chai, null Takashi Fukuda, null Ken Yamazaki, null Yukio Kagawa   +3 more
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On continuous-line acoustic array behavior in a laser Doppler sound pressure measurement system.

The Journal of the Acoustical Society of America, 2009
Continuous-line acoustic array behavior in a laser doppler anemometry (LDA) based sound pressure measurement system is considered. Traditional LDA ultrasound measurement systems intentionally minimize the laser beam intersection or interference fringe volume to better achieve point measurements of the sound field.
Michael S. McBeth, Yongxiang Hu
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Analysis of ionospheric disturbances using Continuous Doppler Sounding and airglow

Distinct Ionospheric perturbations such as equatorial plasma bubbles (EPB) and traveling ionospheric disturbances (TID) affect propagation of electromagnetic waves in the ionosphere. Consequently, electromagnetic waves can be used for their investigation. However, the ionospheric perturbations can also be monitored and analysed optically, using airglow
Jaroslav Chum, Šimon Mackovjak, Carlos Martinis, Maria Graciela Molina, Jiri Base   +4 more
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Comparison of gravity waves detected in the lower ionosphere by narrowband VLF measurements and in the F layer by a continuous Doppler sounding system

Gravity waves (GWs) are an important class of atmospheric waves that can propagate from the troposphere up to the upper atmosphere, where they can contribute significantly to the dynamical changes in the ionosphere. The aim of the present contribution is to gain a deeper understanding of the coupling between the lower and the middle ionosphere via ...
Tamás Bozóki, Jaroslav Chum
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