Search results for " potential"

showing 10 items of 2713 documents

Electric Mobility in Portugal: Current Situation and Forecasts for Fuel Cell Vehicles

2021

In recent years, the growing concern for air quality has led to the development of sustainable vehicles to replace conventional internal combustion engine (ICE) vehicles. Currently, the most widespread technology in Europe and Portugal is that of Battery Electric Vehicles (BEV) or plug‐in HEV (PHEV) electric cars, but hydrogen‐based transport has also shown significant growth in the commercialization of Fuel Cell Electric Vehicles (FCEV) and in the development of new infrastructural schemes. In the current panorama of EV, particular attention should be paid to hydrogen technology, i.e., FCEVs, which is potentially a valid alternative to BEVs and can also be hybrid (FCHEV) and plug‐in hybrid…

TechnologyControl and OptimizationPopulationEnergy Engineering and Power TechnologySocio‐technical transitionplug-in hybridSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricifuel cell vehiclesCommercializationMarket segmentationsocio-technical transitionElectrical and Electronic EngineeringeducationEngineering (miscellaneous)Hydrogen infrastructureeducation.field_of_studyRenewable Energy Sustainability and the EnvironmentTechnological changeTElectric potential energyelectric mobility; fuel cell vehicles; plug-in hybrid; hydrogen; socio-technical transition; forecasting for FCEV; predictive modelBuilding and ConstructionEnvironmental economicsFuel cell vehicleSettore ING-IND/31 - ElettrotecnicaWork (electrical)Internal combustion enginePredictive modelElectric mobilityBusinessPlug‐in hybridEnergy (miscellaneous)Forecasting for FCEVHydrogenEnergies; Volume 14; Issue 23; Pages: 7945
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Sea Wave Energy. A Review of the Current Technologies and Perspectives

2021

The proposal of new technologies capable of producing electrical energy from renewable sources has driven research into seas and oceans. Research finds this field very promising in the future of renewable energies, especially in areas where there are specific climatic and morphological characteristics to exploit large amounts of energy from the sea. In general, this kind of energy is referred to as six energy resources: waves, tidal range, tidal current, ocean current, ocean thermal energy conversion, and saline gradient. This review has the aim to list several wave-energy converter power plants and to analyze their years of operation. In this way, a focus is created to understand how many …

TechnologyControl and OptimizationTidal rangeOcean thermal energy conversionEmerging technologiesAttenuator OD OWC Point absorber Sea wave Terminator WAB WECterminatorEnergy Engineering and Power TechnologyattenuatorPhysics::GeophysicsOWCpoint absorberElectrical and Electronic Engineeringsea waveEngineering (miscellaneous)Physics::Atmospheric and Oceanic PhysicsSettore ING-IND/11 - Fisica Tecnica AmbientaleRenewable Energy Sustainability and the Environmentbusiness.industryTElectric potential energyOcean currentWECRenewable energyCurrent (stream)Work (electrical)Environmental sciencebusinessEnergy (miscellaneous)Marine engineeringEnergies
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Identification of atrial fibrillation drivers by means of concentric ring electrodes

2022

The prevalence of atrial fibrillation (AF) has tripled in the last 50 years due to population aging. High-frequency (DFdriver) activated atrial regions lead the activation of the rest of the atria, disrupting the propagation wavefront. Fourier based spectral analysis of body surface potential maps have been proposed for DFdriver identification, although these approaches present serious drawbacks due to their limited spectral resolution for short AF epochs and the blurring effect of the volume conductor. Laplacian signals (BC-ECG) from bipolar concentric ring electrodes (CRE) have been shown to outperform the spatial resolution achieved with conventional unipolar recordings. Our aimed was to…

TecnologiaAtrial FibrillationBody Surface Potential MappingHumansHealth InformaticsHeart AtriaElectrodesSistema cardiovascularComputer Science ApplicationsComputers in Biology and Medicine
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Cytotoxic phytochemicals from the crude extract of Tetrapleura tetraptera fruits towards multi-factorial drug resistant cancer cells.

2020

Abstract Ethnopharmacological relevance Tetrapleura tetraptera is an African medicinal spice used in traditional medicine to treat several ailments including cancer. Aim of the study The present study was designed to evaluate the cytotoxicity of the dichloromethane-methanol (1:1) extract of the fruits of Tetrapleura tetraptera (TTF) and its constituents: (3R, 4S)-3,4-dimethyloxetan-2-one (1), luteolin (2), stigmasterol (4), 3-O-[6′-O-undecanoyl-β-D-glucopyranosyl]stigmasterol (6), olean-12-en-3-β-O-D-glucopyranoside (7), 3-O-β-D-glucopyranosyl-(1 → 6)-β-D-glucopyranosylurs-12-en-28-oic acid (8), 3-O-β-D-glucopyranosyl-(1 → 3)-β-D-glucopyranosyl-27-hydroxyolean-12-ene-28-oic acid (9), methyl…

Tetrapleura tetrapteraPhytochemicalsApoptosis03 medical and health scienceschemistry.chemical_compoundInhibitory Concentration 500302 clinical medicineBetulinic acidNeoplasmsDrug DiscoveryCytotoxic T cellHumansTetrapleuraCytotoxicity030304 developmental biologyPharmacologychemistry.chemical_classificationMembrane Potential Mitochondrial0303 health sciencesReactive oxygen speciesbiologyDose-Response Relationship DrugPlant ExtractsHep G2 Cellsbiology.organism_classificationHCT116 CellsMolecular biologyAntineoplastic Agents PhytogenicDrug Resistance MultipleMatrix MetalloproteinasesOxidative StresschemistryApoptosisDrug Resistance Neoplasm030220 oncology & carcinogenesisCaspasesFruitCancer cellReactive Oxygen SpeciesLuteolinSignal TransductionJournal of ethnopharmacology
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Modulation of intracellular calcium concentrations and T cell activation by prickly pear polyphenols.

2004

Opuntia ficus indica (prickly pear) polyphenolic compounds (OFPC) triggered an increase in [Ca2+]i in human Jurkat T-cell lines. Furthermore, OFPC-induced rise in [Ca2+]i was significantly curtailed in calcium-free buffer (0% Ca2+) as compared to that in 100% Ca2+ medium. Preincubation of cells with tyrphostin A9, an inhibitor of Ca2+ release-activated Ca2+ (CRAC) channels, significantly diminished the OFPC-induced sustained response on the increases in [Ca2+]i. Lanthanum and nifedipine, the respective inhibitors of voltage-dependent and L-type calcium channels, failed to curtail significantly the OFPC-induced calcium response. As OFPC still stimulated increases in [Ca2+]i in 0% Ca2+ medium…

ThapsigarginT-LymphocytesClinical Biochemistrychemistry.chemical_elementGene ExpressionBiologyCalciumLymphocyte ActivationCalcium in biologyMembrane Potentialschemistry.chemical_compoundJurkat CellsPhenolsmedicineHumansCalcium SignalingRNA MessengerMolecular BiologyCalcium signalingCalcium metabolismFlavonoidsVoltage-dependent calcium channelDose-Response Relationship DrugPlant ExtractsReverse Transcriptase Polymerase Chain ReactionEndoplasmic reticulumOpuntiaPolyphenolsCell BiologyGeneral MedicineTyrphostinsMechanism of actionBiochemistrychemistryBiophysicsInterleukin-2ThapsigarginCalciummedicine.symptomMolecular and cellular biochemistry
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La recente riforma della disciplina italiana del subappalto nella prospettiva del bid rigging

2023

L’articolo analizza in chiave critica la disciplina nazionale del subappalto nell’ambito delle gare pubbliche, così come recentemente riformata a seguito di diversi interventi normativi in ottemperanza alla procedura d’infrazione avviata dalla Commissione UE. Stando alla tesi dell’A., l’attuale quadro normativo – caratterizzato dalla quasi totale eliminazione delle limitazioni previgenti (probabilmente anche spingendosi oltre ciò che la Commissione UE ha richiesto) – difetta nel trovare un equo bilanciamento tra il principio della massima partecipazione alla gara, da un lato, e l’esigenza di prevenire e svelare potenziali condotte collusive, dall’altro. La suddetta conclusione, peraltro, ap…

The article critically analyzes the Italian regulation of subcontracting in the context of public tenders as recently amended by several legislative measures in compliance with the infringement procedure launched by the European Commission against Italy. According to the Author’s view the current legislative framework – characterized by the almost overall elimination of the previous limits (probably even going beyond what the European Commission requested) – lacks in finding a fair balance between the principle of the maximum participation in the tender on the one hand and the need to prevent and reveal potential collusive conduct on the other. Furthermore this conclusion is supported by the analysis of the regulation of the causes of exclusion from the tender still too timid in envisaging the optional exclusion of the participants due to anticompetitive conduct.
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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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Thermodynamic formalism and linear response theory for non-equilibrium steady states

2016

We study the linear response in systems driven away from thermal equilibrium into a nonequilibrium steady state with nonvanishing entropy production rate. A simple derivation of a general response formula is presented under the condition that the generating function describes a transformation that (to lowest order) preserves normalization and thus describes a physical stochastic process. For Markov processes we explicitly construct the conjugate quantities and discuss their relation with known response formulas. Emphasis is put on the formal analogy with thermodynamic potentials and some consequences are discussed.

Thermal equilibriumNormalization (statistics)Statistical Mechanics (cond-mat.stat-mech)Stochastic processEntropy productionMarkov processNon-equilibrium thermodynamicsFOS: Physical sciences01 natural sciences010305 fluids & plasmasThermodynamic potentialsymbols.namesake0103 physical sciencessymbolsStatistical physics010306 general physicsLinear response theoryCondensed Matter - Statistical MechanicsMathematics
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Gibbs equation in the nonlinear nonequilibrium thermodynamics of dilute nonviscous gases

2003

AbstractThis paper deals with the derivation of the Gibbs equation for a nonviscous gas in the presence of heat flux. The analysis aims to shed some light on the physical interpretation of thermodynamic potentials far from equilibrium. Two different definitions for the chemical potential and thermodynamic pressure far from equilibrium are introduced: nonequilibrium chemical potential and nonequilibrium thermodynamic pressure at constant heat flux q and nonequilibrium chemical potential and nonequilibrium thermodynamic pressure at constant J = Vq, where V is the specific volume.

Thermodynamic stateThermodynamic equilibriumApplied MathematicsNonequilibrium thermodynamic potentialsThermodynamicsThermodynamic databases for pure substancesNonequilibrium thermodynamicsThermodynamic equationsThermodynamic systemExtended thermodynamicsThermodynamic potentialsymbols.namesakeGibbs equationGibbs–Helmholtz equationsymbolsKinetic theoryMathematicsThermodynamic processApplied Mathematics Letters
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Elaboration of Trans-Resveratrol Derivative-Loaded Superparamagnetic Iron Oxide Nanoparticles for Glioma Treatment

2019

In this work, new nanohybrids based on superparamagnetic iron oxide nanoparticles (SPIONs) were elaborated and discussed for the first time as nanovectors of a derivative molecule of trans-resveratrol (RSV), a natural antioxidant molecule, which can be useful for brain disease treatment. The derivative molecule was chemically synthesized (4&rsquo

Thermogravimetric analysisGeneral Chemical EngineeringNanoparticle02 engineering and technologyArticletrans-resveratrol derivativelcsh:Chemistry03 medical and health sciencesDynamic light scatteringX-ray photoelectron spectroscopygliomaZeta potentialMoleculeGeneral Materials Science[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics030304 developmental biologyiron oxide superparamagnetic nanoparticles0303 health sciencesChemistry<i>trans</i>-resveratrol derivativefood and beverages021001 nanoscience & nanotechnology3. Good healthMembranelcsh:QD1-999Drug deliverydrug delivery0210 nano-technologyNuclear chemistryNanomaterials
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