Search results for "wave measurement"

showing 4 items of 4 documents

Identifying wave and turbulence components in wind-driven shallow basins

2012

Wind-induced waves play an important role in shallow lake hydro- and sediment dynamics. That is why field measurements are important for the validation of their estimation methods, especially in shallow waters. In the first part of the present paper a method is introduced to improve the interpretation of the measured data, applicable both for pressure and velocity data. Replacing the turbulence-affected tail of the measured spectrum with a fitted power function causes a considerable 8-10% difference in the derived bulk wave parameters so this procedure is worth to be done. In the second part an appropriate technique to obtain wave features from 3D velocity time series will be described. The…

Field (physics)Series (mathematics)MeteorologyTurbulenceSettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaDynamics (mechanics)MechanicsGeotechnical Engineering and Engineering GeologyWave shoalingwave measurement shallow lake lagoon velocity decomposition wave motion turbulenceWind waveStokes wavePower functionGeologyCivil and Structural EngineeringPeriodica Polytechnica Civil Engineering
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Measurement of the soliton number in guiding media through continuum generation.

2020

No general approach is available yet to measure directly the ratio between chromatic dispersion and the nonlinear coefficient, and hence the soliton number for a given optical pulse, in an arbitrary guiding medium. Here we solve this problem using continuum generation. We experimentally demonstrate our method in polarization-maintaining and single-mode fibers with positive and negative chromatic dispersion. Our technique also offers new opportunities to determine the chromatic dispersion of guiding media over a broad spectral range while pumping at a fixed wavelength. (C) 2020 Optical Society of America

optical fiberOptical fiberPhysics::Optics02 engineering and technology01 natural scienceslaw.invention010309 opticschromatic dispersionOptics:FÍSICA [UNESCO]law0103 physical sciencesDispersion (optics)supercontinuum generationPhysicsCONTINUOUS-WAVE MEASUREMENT; PHASE-MODULATION METHOD; OPTICAL-FIBERS; SUPERCONTINUUM GENERATION; REFRACTIVE-INDEX; DISPERSION; COEFFICIENT; INTERFEROMETER; NONLINEARITY; COMPRESSIONsoliton propagationContinuum (measurement)business.industrynonlinear opticsUNESCO::FÍSICANonlinear coefficient021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsNonlinear systemWavelengthInterferometry0210 nano-technologybusinessRefractive indexOptics letters
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Electrical and optical properties of Graphene Field-Effect Transistors (GFETs) fabricated on sapphire

Graphene CVD Graphene Graphene Field-Effect Transistors (GFETs) Microwave measurements on GFETsSettore ING-INF/01 - Elettronica
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SMOS REFLEX 2003: L-band emissivity characterization of vineyards

2005

The goal of the Soil Moisture and Ocean Salinity mission over land is to infer surface soil moisture from multiangular L-band radiometric measurements. As the canopy affects the microwave emission of land, it is necessary to characterize different vegetation layers. This paper presents the Reference Pixel L-Band Experiment (REFLEX), carried out in June-July 2003 at the Vale/spl grave/ncia Anchor Station, Spain, to study the effects of grapevines on the soil emission and on the soil moisture retrieval. A wide range of soil moisture (SM), from saturated to completely dry soil, was measured with the Universitat Polite/spl grave/cnica de Catalunya's L-band Automatic Radiometer (LAURA). Concurre…

Canopy010504 meteorology & atmospheric sciencesUniversitat Politecnica de CatalunyaOceanografia -- Instruments0211 other engineering and technologiesMicrowave measurements02 engineering and technologyradiometryAtmospheric sciencesSensors remots01 natural sciencesvineyardsHidrologia -- Aparells i instrumentssoil emissionWater contentGeophysical instrumentsmicrowave measurementValencia Anchor StationRemote sensing[INFO.INFO-IA] Computer Science [cs]/Computer Aided EngineeringL-band emissivitysoil roughnessVegetació -- CartografiaOpacitysoil temperaturevegetation mappingOceanographic instrumentsBoundary layer (Meteorology)VineyardsoilGeofísica -- Aparells i instrumentsCapa límit (Meteorologia)Hydrological instrumentsEmissivity:Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones radiofreqüència i ones mil·limètriques [Àrees temàtiques de la UPC]RadiometriaElectrical and Electronic EngineeringL-band microwave radiometry021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensingReference Pixel L-Band ExperimentRadiometervegetation layersopacity15. Life on land[INFO.INFO-IA]Computer Science [cs]/Computer Aided EngineeringAD 2003 06 to 07SMOS REFLEX 2003:Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC]Soil waterMicroones -- MesuramentL-band Automatic RadiometerGeneral Earth and Planetary SciencesEnvironmental scienceRadiometryhydrological techniquesSoil Moisture and Ocean Salinity missionsoil moistureLAURAland microwave emissionalbedo
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