Search results for " ceramics"

showing 10 items of 117 documents

Dielectric spectra of electron-irradiated PSN ceramics

1997

The influence of electron-irradiation on the dielectric properties of transparent PSN ferroelectric ceramics is studied by low (LF) and infralow (ILF) frequency spectrum analysis. Redistribution of relaxation frequencies caused by electron-irradiation has been discovered and is related to pinning impacts of the radiation-induced defects.

Materials scienceCondensed matter physicsSolid-state physicsFerroelectric ceramicschemistry.chemical_elementDielectricElectronElectroluminescenceThuliumNuclear magnetic resonancechemistryvisual_artvisual_art.visual_art_mediumIrradiationCeramicSPIE Proceedings
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Analytical stress-strain law of FRP confined masonry in compression: Literature review and design provisions

2017

Abstract The use of Fibre Reinforced Polymer (FRP) wraps has become common in practical applications to retrofit existing columns with poor structural features. Wrapping the member with one or more FRP sheets makes it possible to induce confinement action and enhance strength and ductility. This application has been widely studied and adopted in reinforced concrete members for about twenty years, while its suitability to masonry columns and piers has been investigated during the last decade. The results of several studies were summarized in different design expressions for calculating effective confinement pressure, ultimate compressive stress and strain, and the overall trend of the stress…

Materials scienceConstitutive equation0211 other engineering and technologiesCeramics and Composite02 engineering and technologyIndustrial and Manufacturing EngineeringRetrofit021105 building & constructionMechanics of MaterialComposite materialDuctilityCompression; FRP confinement; Masonry; Retrofit; Ceramics and Composites; Mechanics of Materials; Mechanical Engineering; Industrial and Manufacturing EngineeringMasonrybusiness.industryMechanical EngineeringStress–strain curveCompressionStructural engineeringFibre-reinforced plasticMasonry021001 nanoscience & nanotechnologyCompression (physics)Strength of materialsSettore ICAR/09 - Tecnica Delle CostruzioniCompressive strengthMechanics of MaterialsCeramics and CompositesFRP confinement0210 nano-technologybusiness
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Finite element analysis of the out-of-plane behavior of FRP strengthened masonry panels

2017

Abstract In the present study a numerical model is proposed for the response of out-of-plane loaded calcarenite masonry walls strengthened with vertical CFRP strips applied on the substrate by means of epoxy resin. A simplified structural scheme is considered consisting in a beam fixed at one end, subjected to constant axial load and out-of-plane lateral force monotonically increasing. Two different constraint conditions are taken into account: in the first one, the panel is assumed free to rotate at the top end while, in the second one, the rotation is restrained. Three-dimensional finite elements are used for the calcarenite parts and an equivalent constitutive law available in the litera…

Materials scienceConstitutive equationShell (structure)FRP-masonry interfaceCeramics and CompositeFinite element modeling; FRP strengthening; FRP-masonry interface; Masonry panels; Out-of-plane behavior; Ceramics and Composites; Mechanics of Materials; Mechanical Engineering; Industrial and Manufacturing Engineering02 engineering and technology010402 general chemistry01 natural sciencesIndustrial and Manufacturing EngineeringFRP strengtheningMechanics of MaterialMasonry panelsComposite materialFinite element modelingMasonry panelbusiness.industryMechanical EngineeringLinear elasticityStructural engineeringMasonryFibre-reinforced plastic021001 nanoscience & nanotechnologyStrength of materialsFinite element method0104 chemical sciencesSettore ICAR/09 - Tecnica Delle CostruzioniMechanics of MaterialsCeramics and Composites0210 nano-technologybusinessBeam (structure)Out-of-plane behavior
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Synthesis of YAG nanopowder by the co-precipitation method: Influence of pH and study of the reaction mechanisms

2012

International audience; YAG nanopowders with an average grain size of 30 nm have been successfully synthesized by the co-precipitation method using nitrates with precipitant of ammonium hydrogen carbonate. The influence of precipitation conditions such as pH, aging time and calcination temperature on the formation of secondary phases has been studied. The accurate control of pH value at every stage of precipitation process is crucial to avoid the presence of YAM (Yttrium Aluminium Monoclinic, Y4Al2O9) and yttrium oxide (Y2O3) after calcination. The reaction mechanisms have been investigated using different techniques such as infrared spectroscopy, x-ray diffraction and thermal analyses. The…

Materials scienceCoprecipitationInorganic chemistryOxideTRANSPARENT CERAMICSFABRICATIONchemistry.chemical_element02 engineering and technology01 natural scienceslaw.inventionInorganic Chemistrychemistry.chemical_compoundlawAluminiumYTTRIUM-ALUMINUM-GARNET0103 physical sciencesMaterials ChemistryNANO-SIZED POWDERCalcinationPhysical and Theoretical ChemistryPerovskite (structure)010302 applied physicsPRECURSORSPrecipitation (chemistry)Yttrium021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialschemistryChemical engineeringPRECIPITATIONCeramics and CompositesLASER0210 nano-technologyMonoclinic crystal system
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Ultrafast luminescence of Ga- and In-doped ZnO ceramics

2021

The work of authors (a-c) was financially supported by Russian Foundation for Basic Research (RFBR, Russia) and the work of the last author (d) had financial support from State Education Development Agency (VIAA, Latvia) . All of that was approved as a result of ERA.Net RUS PLUS 2017 joint call for proposals. Here is the link for the joint call for reference: https://www.eranet-rus.eu/en/196.php .

Materials scienceGeneral Computer Science01 natural sciences010309 opticsScintillating ceramics0103 physical sciencesNano-Zinc oxideApplied optics. PhotonicsCeramicElectrical and Electronic Engineering010302 applied physicsQuenchingDopantPrecipitation (chemistry)Near-band-edge emission4. EducationDopingQC350-467Optics. LightAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsTA1501-1820Chemical engineeringvisual_artRadioluminescencevisual_art.visual_art_medium:NATURAL SCIENCES [Research Subject Categories]Grain boundaryLuminescenceTotal transmittance
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Upconversion luminescence in transparent oxyfluoride glass ceramics containing hexagonal NaErF4

2019

The authors wish to express gratitude to K. Smits for TEM measurements. This research is funded by the Latvian Council of Science, project “Novel transparent nanocomposite oxyfluoride materials for optical applications”, project No. LZP-2018/1-0335. GK wishes to expresses gratitude to Arnis Riekstins "MikroTik" donation. Donations are administered by the University of Latvia Foundation. © 2019. This work is licensed under a CC BY-NC-ND 4.0 license.

Materials scienceGlass ceramicsAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyIonMaterials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]CeramicSpectroscopyOxyfluorideSite-selective spectroscopyMechanical EngineeringMetals and AlloysRate equation021001 nanoscience & nanotechnologyPhoton upconversion0104 chemical sciencesMicrocrystallineNanocrystalMechanics of MaterialsTransmission electron microscopyvisual_artvisual_art.visual_art_medium0210 nano-technologyNaErF4Upconversion
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Upconversion luminescence of Er3 +/Yb3 + and their role in the stabilization of cubic NaLaF4 nanocrystals in transparent oxyfluoride glass ceramics

2018

CC BY-NC-ND

Materials scienceGlass ceramicsMineralogy02 engineering and technologyCrystal structure010402 general chemistry7. Clean energy01 natural sciencesFluoritelaw.inventionlawPhase (matter)Materials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]CrystallizationOxyfluorideSite-selective spectroscopyDoping021001 nanoscience & nanotechnologyCondensed Matter PhysicsPhoton upconversion3. Good health0104 chemical sciencesElectronic Optical and Magnetic MaterialsCrystallographyNanocrystalNaLaF4Ceramics and CompositesCrystallite0210 nano-technologyUpconversion
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Production and Properties of Lead Scandoniobate Ferroelectric Ceramics Doped with Rare-Earth Oxides

2001

Materials scienceMechanical EngineeringFerroelectric ceramicsDopingMetallurgyRare earthMineralogySinteringlaw.inventionLead (geology)Mechanics of MaterialslawGeneral Materials ScienceCalcinationKey Engineering Materials
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Modified PbSc<sub>1/2</sub>Nb<sub>1/2</sub>O<sub>3</sub> Ferroelectric Ceramics

1997

Materials scienceMechanics of MaterialsMechanical EngineeringFerroelectric ceramicsSinteringGeneral Materials ScienceComposite materialKey Engineering Materials
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On the Improved Current Pulse method for the thermal diffusive characterization of lithiated ceramic pebble beds

2012

Abstract Packed pebble beds are granular systems composed of small particles generally arranged in irregular lattices and surrounded by a gas filling their interstitial spaces. They show non-linear and coupled thermal and mechanical behaviours, which are under theoretical and experimental investigation to set-up a realistic constitutive model to be adopted for design-oriented purposes. At the Department of Nuclear Engineering (DIN) of the University of Palermo a realistic constitutive model of fusion-relevant pebble beds thermo-mechanical behaviour was developed adopting a “continuous” approach, based on the assumption that a pebble bed could be considered as a continuous, homogeneous and i…

Materials sciencePebble bed Lithiated ceramics Thermal diffusive propertiesIsotropyConstitutive equationEnergy Engineering and Power Technologychemistry.chemical_elementMechanicsPebble beds Current pulse method Thermal diffusive propertiesIndustrial and Manufacturing EngineeringCharacterization (materials science)chemistry.chemical_compoundchemistryvisual_artThermalvisual_art.visual_art_mediumGeotechnical engineeringLithiumCeramicOrthosilicatePebbleSettore ING-IND/19 - Impianti Nucleari
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