Search results for " Inertia"

showing 10 items of 117 documents

A simulation study for assessing the impact of energy storage systems for Fast Reserve with additional synthetic inertia control on the Continental E…

2022

This article shows the results of a simulation study on the application of battery storage systems for providing fast frequency regulation (the so-named Fast Reserve) with additional synthetic inertia control. The aim of the study is to assess the impact of the extension of the regulation provided by the FRUs to all the Continental Europe synchronous grid, with the same power proportions of the first Italian FRU auction. The simulations are conducted in two different scenarios: a base one related to 2020 and a future one related to 2040 and based on ENTSO-E projections for load and generation. The results show that, for the reference incident of 3000 MW, the frequency quality parameters in …

Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaBattery storage Continental Europe Fast Reserve Unit Primary frequency regulation Synthetic inertiaRenewable Energy Sustainability and the EnvironmentEnergy Engineering and Power TechnologySustainable Energy Technologies and Assessments
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Surface soil water content estimation based on thermal inertia and Bayesian smoothing

2014

Soil water content plays a critical role in agro-hydrology since it regulates the rainfall partition between surface runoff and infiltration and, the energy partition between sensible and latent heat fluxes. Current thermal inertia models characterize the spatial and temporal variability of water content by assuming a sinusoidal behavior of the land surface temperature between subsequent acquisitions. Such behavior implicitly supposes clear sky during the whole interval between the thermal acquisitions; but, since this assumption is not necessarily verified even if sky is clear at the exact epoch of acquisition, , the accuracy of the model may be questioned due to spatial and temporal varia…

Soil Water Content Bayesian Smoothing Thermal Inertia MODIS SEVIRI.Meteorologymedia_common.quotation_subjectPolar orbitBayesian SmoothingLatent heatSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliElectrical and Electronic EngineeringWater contentImage resolutionRemote sensingmedia_commonSettore ING-INF/03 - TelecomunicazioniElectronic Optical and Magnetic MaterialSettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaThermal InertiaComputer Science Applications1707 Computer Vision and Pattern RecognitionSEVIRICondensed Matter PhysicsApplied MathematicGeographyMODISSoil Water ContentSkyGeostationary orbitSurface runoffShortwaveSettore ICAR/06 - Topografia E CartografiaSPIE Proceedings
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Thermal inertia modeling for soil surface water content estimation: A laboratory experiment

2012

We are proposing a new method for estimating soil surface water content from thermal inertia distributions retrieved from visible–near infrared (VISNIR)and thermal infrared (TIR) images. A drying experiment was conducted on three fi ne-textured soils while acquiring multispectral VIS-NIR and TIR images. Simultaneous measurements of soil water content and thermal inertia were conducted by the thermogravimetric method and the heat pulse technique, respectively. Direct measurements were used to test the thermal inertia approach proposed by Murray and Verhoef that requires only knowledge of soil porosity and can be easily inverted to derive soil water content from thermal inertia. For the three…

TIR thermal infraredVIS-NIR visible–near infraredThermal inertiaSettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliSoil ScienceEnvironmental scienceSoil scienceGeotechnical engineeringSoil surfaceLaboratory experimentATI apparent thermal inertiaWater content
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In-beam spectroscopic study of Cf244

2018

The ground-state rotational band of the neutron-deficient californium (Z = 98) isotope 244Cf was identified for the first time and measured up to a tentative spin and parity of I I-pi = 20(+). The observation of the rotational band indicates that the nucleus is deformed. The kinematic and dynamic moments of inertia were deduced from the measured gamma-ray transition energies. The behavior of the dynamic moment of inertia revealed an up-bend due to a possible alignment of coupled nucleons in high-j orbitals starting at a rotational frequency of about (h) over bar (omega) = 0.20 MeV. The results were compared with the systematic behavior of the even-even N = 146 isotones as well as with avail…

TOTAL DATA READOUTNuclear Theorychemistry.chemical_elementDEFORMATIONS114 Physical sciences7. Clean energy01 natural sciencesHEAVY-ELEMENTSNUCLEAR-DATA SHEETSAtomic orbital0103 physical sciencesDETECTORSmedicineSPECTROMETERGamma spectroscopyNuclear Experiment010306 general physicsGAMMA-RAY SPECTROSCOPYPhysicsIsotope010308 nuclear & particles physicsROTATIONAL BANDSCaliforniumParity (physics)Moment of inertiamedicine.anatomical_structurechemistryISOTOPESAtomic physicsNucleonDECAYNucleusPhysical Review C
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An original control strategy of storage systems for the frequency stability of autonomous grids with renewable power generation

2021

This work examines the operation of the autonomous power system of a geographical island assuming the integration of significant generation shares from renewable energy sources and the installation of the required storage systems. The frequency stability of the system is investigated considering different operating conditions, in terms of load demand and renewable power generation. The main focus of the work is an original control strategy specifically designed for power converters interfacing storage units to the grid. The proposed strategy is based on an extended frequency droop control, which selects specific droop settings depending on the operating mode—charge or discharge—of the stora…

TechnologyControl and OptimizationComputer science020209 energyAutomatic frequency controlFrequency stabilitySynthetic inertiaEnergy Engineering and Power Technology02 engineering and technologySmall islandsElectric power system0202 electrical engineering electronic engineering information engineeringFrequency droopVoltage droopElectrical and Electronic EngineeringEngineering (miscellaneous)Renewable Energy Sustainability and the Environmentbusiness.industryT020208 electrical & electronic engineeringControl engineeringConvertersGridRenewable energyPower (physics)Autonomous systemsSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaPrimary reserveInterfacingbusinessEnergy (miscellaneous)Storage systems
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Introducing Thermal Inertia for Monitoring Snowmelt Processes With Remote Sensing

2019

Thermal inertia has been successfully used in remote sensing applications that span from geology, geomorphology to hydrology. In this paper, we propose the use of thermal inertia for describing snow dynamics. Two different formulations of thermal inertia were tested using experimental and simulated data related to snowpack dynamics. Experimental data were acquired between 2012 and 2017 from an automatic weather station located in the western Italian Alps at 2,160 m. Simulations were obtained using the one‐dimensional multilayer Crocus model. Results provided evidences that snowmelt phases can be recognized, and average snowpack density can be estimated reasonably well from thermal inertia o…

Thermal inertiasnowmelt processeFIS/06 - FISICA PER IL SISTEMA TERRA E PER IL MEZZO CIRCUMTERRESTREGEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIAGEO/12 - OCEANOGRAFIA E FISICA DELL'ATMOSFERAsnow density[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorologythermal inertiaGEO/11 - GEOFISICA APPLICATAremote sensingGeophysicsGEO/10 - GEOFISICA DELLA TERRA SOLIDARemote sensing (archaeology)[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/ClimatologySnowmeltGeneral Earth and Planetary SciencesEnvironmental scienceGeophysicEarth and Planetary Sciences (all)Settore ICAR/06 - Topografia E CartografiaRemote sensing
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Mathematical model for the adsorption-induced nonlocal frequency shift in adatoms-nanobeam system

2017

Abstract This paper models and investigates the resonance frequency shift induced by the adsorption phenomena for an adatoms-nanobeam system including the small scale effect as well as rotary inertia and shear distortion effects. The Lennard-Jones (6–12) type potential is used to determine the adsorption-induced energy owing van der Waals (vdW) interaction mechanism between adatom-adatom and adatom-substrate. The small scale effect is introduced by using Eringen's nonlocal elasticity theory while the explicit expressions of inertia moment and shear force are derived from the standard Timoshenko beam equations in which the residual stress effect is accounted as an additive axial load. Numeri…

Timoshenko beam theoryPhysicsCondensed matter physicsmedia_common.quotation_subjectShear forceRotary inertia02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter PhysicsInertiaElectronic Optical and Magnetic MaterialsMoment (mathematics)VibrationShear (sheet metal)Condensed Matter::Materials Sciencesymbols.namesake020303 mechanical engineering & transports0203 mechanical engineeringPhysics::Atomic and Molecular ClusterssymbolsPhysics::Chemical PhysicsElectrical and Electronic Engineeringvan der Waals force0210 nano-technologymedia_commonPhysica B: Condensed Matter
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PM—Power and Machinery

2001

Abstract In both the OECD Code and the EC Directive for testing dual-pillar front-mounted roll-over protection structures for narrow track width tractors, a non-continuous rolling preliminary test in case of lateral overturning is provided. This test can be simulated with a computer programme. The role of the tyres (and also of the rims) in the lateral overturning of narrow tractors is very important. Frequently the same tractor can be alternatively equipped with four, five, or more different tyre combinations, which can vary its total mass, width, centre of gravity position and moment of inertia about its longitudinal axis. According to the Standards the preliminary test must be carried ou…

TractorEngineeringbusiness.product_categorybusiness.industryStructural engineeringAquatic ScienceMoment of inertiaTrack (rail transport)Greatest DiameterAutomotive engineeringPower (physics)Test (assessment)Continuous rollingLongitudinal axisbusinessJournal of Agricultural Engineering Research
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Dryland vegetation pattern dynamics driven by inertial effects and secondary seed dispersal

2022

This manuscript tackles the study of vegetation pattern dynamics driven by inertial effects and secondary seed dispersal. To achieve this goal, an hyperbolic extension of the classical parabolic Klausmeier model of vegetation, generally used to predict the formation of banded vegetation along the slopes of semiarid environments, has been here considered together with an additional advective term mimicking the downslope motion of seeds. Linear stability analyses have been carried out to inspect the dependence of the wave instability locus on the model parameters, with particular emphasis on the role played by inertial time and seed advection speed. Moreover, periodic travelling wave solution…

Vegetation stripe patterns Hyperbolic reaction–advection–diffusion models Inertial times Secondary seed dispersal Wave instability Travelling wave solutionsEcological ModelingSettore MAT/07 - Fisica MatematicaEcological Modelling
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