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The suppression of ocean waves by biogenic slicks.
J R Soc Interface
November 2024
Carl von Ossietzky Universitat Oldenburg, Oldenburg, DE, Germany.
Ocean waves are significantly damped by biogenic surfactants, which accumulate at the sea surface in every ocean basin. The growth, development, and breaking of short wind-driven surface waves are key mediators of the air-sea exchange of momentum, heat and trace gases. The mechanisms through which surfactants suppress waves have been studied in great detail through careful laboratory experimentation in quasi-one-dimensional wave tanks.
View Article and Find Full Text PDFRobust IMU-Based Mitigation of Human Body Shadowing in UWB Indoor Positioning.
Sensors (Basel)
October 2023
Department of Information Technology, IMEC-WAVES/Ghent University, Technologiepark-Zwijnaarde 126, 9052 Gent, Belgium.
Ultra-wideband (UWB) indoor positioning systems have the potential to achieve sub-decimeter-level accuracy. However, the ranging performance degrades significantly under non-line-of-sight (NLoS) conditions. The detection and mitigation of NLoS conditions is a complex problem and has been the subject of many works over the past decades.
View Article and Find Full Text PDFA Synchronized Two-Dimensional - Model of the Solar Dynamo.
Sol Phys
July 2023
Univ. Toulouse, IRAP, CNRS, UMR 5277, CNES, UPS, F-31400 Toulouse, France.
Unlabelled: We consider a conventional --dynamo model with meridional circulation that exhibits typical features of the solar dynamo, including a Hale-cycle period of around 20 years and a reasonable shape of the butterfly diagram. With regard to recent ideas of a tidal synchronization of the solar cycle, we complement this model by an additional time-periodic -term that is localized in the tachocline region. It is shown that amplitudes of some decimeters per second are sufficient for this -term to become capable of entraining the underlying dynamo.
View Article and Find Full Text PDFLOCATE-US: Indoor Positioning for Mobile Devices Using Encoded Ultrasonic Signals, Inertial Sensors and Graph-Matching.
Sensors (Basel)
March 2021
Department of Electronics, University of Alcalá, Alcalá de Henares, 28801 Madrid, Spain.
Indoor positioning remains a challenge and, despite much research and development carried out in the last decade, there is still no standard as with the Global Navigation Satellite Systems (GNSS) outdoors. This paper presents an indoor positioning system called LOCATE-US with adjustable granularity for use with commercial mobile devices, such as smartphones or tablets. LOCATE-US is privacy-oriented and allows every device to compute its own position by fusing ultrasonic, inertial sensor measurements and map information.
View Article and Find Full Text PDFCalculations of heating of membrane-forming holes in Teflon film exposed to decimeter waves were performed. The dependence of the temperature increment in holes on the geometry of holes, electrolyte concentration, and decimeter wave frequency was studied. The kinetics of heating depending on the hole diameter was also obtained.
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