Search results for " substrate"

showing 10 items of 129 documents

Advanced fragmentation stage of oxide coating on polymer substrate under biaxial tension

2005

Crack patterns of 100-nm-thick silicon oxide coating on polypropylene film subjected to equibiaxial stress loading are studied experimentally. The loading is achieved by means of a bulging cell mounted under an optical microscope with stepwise pressurization of film specimens. The evolution of the coating fragment area distribution at relatively high strains is modeled using Weibull statistics to describe the coating strength. The fragment area distribution at an advanced fragmentation stage is shown to scale with the average fragment area, the latter being a power function of the applied biaxial strain.

Silicon oxidePolypropyleneMaterials sciencePolymersMetals and AlloysBiaxial tensile testSurfaces and Interfacesengineering.materialSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionchemistry.chemical_compoundchemistryOptical microscopeCoatingFragmentationCoatingslawMaterials ChemistryengineeringPolymer substrateThin filmComposite materialSilicon oxideWeibull distributionThin Solid Films
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Layout influence on microwave performance of graphene field effect transistors

2018

The authors report on an in-depth statistical and parametrical investigation on the microwave performance of graphene FETs on sapphire substrate. The devices differ for the gate-drain/source distance and for the gate length, having kept instead the gate width constant. Microwave S -parameters have been measured for the different devices. Their results demonstrate that the cut-off frequency does not monotonically increase with the scaling of the device geometry and that it exists an optimal region in the gate-drain/source and gate-length space which maximises the microwave performance.

TechnologyMaterials science02 engineering and technologyHardware_PERFORMANCEANDRELIABILITYSettore ING-INF/01 - Elettronica01 natural scienceslaw.inventionComputer Science::Hardware ArchitectureComputer Science::Emerging Technologieslaw0103 physical sciencesHardware_INTEGRATEDCIRCUITSElectrical and Electronic EngineeringScaling010302 applied physicsbusiness.industryGrapheneComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWide-bandgap semiconductorSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnologyGraphene field effect transistorsSapphire substrateOptoelectronicsField-effect transistorGraphene0210 nano-technologyConstant (mathematics)businessMicrowaveddc:600MicrowaveHardware_LOGICDESIGN
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Integrazione di celle fotovoltaiche ibride nel vetromattone

2012

L’invenzione riguarda l’integrazione del vetromattone con celle solari ibride (organiche/inorganiche), conosciute come Dye-sensitized Solar Cell (DSC). La combinazione del vetromattone con le DSC consente di migliorare le prestazioni del prodotto originario rendendolo in grado di produrre energia pulita. Le caratteristiche di trasparenza e isolamento termo-acustico del prodotto possono essere regolate agendo sulla configurazione delle DSC. Il prodotto può essere assemblato a formare pannelli fotovoltaici per la realizzazione di facciate traslucide energeticamente “attive” in varie condizioni luminose (condizioni di luce diffusa o artificiale) e indipendentemente dall’angolo di radiazione so…

The integration of Dye-sensitized Solar Cell (DSC) with the glassblock is disclosed. The combination of the two technological elements the glassblock and the DSC module enhance their own peculiarities. The final complete product is ready-made for installation owns the qualities of the glassblock and produces sustainable energy at the same time. The transparency and the thermo-acoustic insulation may be modulated according to the specific requirements of each case of installation. The product may be used for example to create PV panels for glazed and translucent façades that are able to perform efficiently in all light conditions (even in diffuse light also converting internal artificial light) that are not dependant on the angle of the solar radiation and do not suffer from the high operative temperatures of functioning due to the peculiarities of the DSCs. DSCs are made of economic and biocompatible materials and are produced with low-cost and highly productive printing methods on rigid or flexible substrates. With the integration of DSC modules with the glassblock PV panels coincide with the envelope itself so that they do not need any further structures to be installed on and allow the possibility of subtract from the price of the panel the price of the substituted building element allowing further economies. DSCs can be printed in different colours and with various patterns offering to designers and customers the possibility of intervening on the glassblock aesthetical aspect also taking advantage of the peculiar modularity of the glassblock for larger compositions of drawings on the building’s façade. Seven Hypotheses of integration are discussed in order to obtain DSC-integrated glassblock ready for the construction of a precast and dry-assembled PV panel which can use the horizontal and vertical cavities between the glassblocks to house plastic profiles where the electric interconnections and the steel bars -useful for improve the mechanical resistance of the panel- are integrated.Settore ICAR/10 - Architettura Tecnica
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Study of the dynamics of biomolecules by high speed atomic force microscopy and surface enhanced Raman spectroscopy

2015

This thesis focuses on the coupling of High–Speed Atomic Force Microscopy (HS-AFM) and Surface Enhanced Raman Spectroscopy (SERS) for biomolecule analysis. We have designed a fabrication protocol to manufacture “SERS-active” substrates. The efficacy of gold, silver and gold-silver bimetallic crystalline nanoparticle substrates were evaluated. We have investigated the impact of optical and morphological features of the substrates on Raman signal intensity by analyzing well-known samples such as bipyridine ethylene and methylene blue molecules. We took an interest in three distinct biological problematics with HS-AFM and SERS analyses. First, we have detected the chemical signature of cytochr…

Tip–Enhanced Raman Spectroscopy (TERS)Surface Enhanced Raman Spectroscopy (SERS)CellsProteinsDetergent resistant membrane domains (DRMs)ProtéinesSpectroscopie Raman exaltée de surface (SERS)Nanoparticle substratesNoroviruses (NoVs)Substrats de nanoparticulesHigh–Speed Atomic Force Microscopy (HS-AFM)Microscopie à force atomique haute-vitesse (HS-AFM)Diffusion Raman exaltée par effet de pointe (TERS)Détergent résistant membrane domaines (DRMs)Plasmons de Surface Localisé (LSP)Cellules[PHYS.PHYS] Physics [physics]/Physics [physics]Localized Surface Plasmons (LSP)
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Effects of substrate solarization on tomato soilless cultivation

2008

Tomato greenhouse coconut coir dust substrate cultivar
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Estimation of interfacial fracture toughness based on progressive edge delamination of a thin transparent coating on a polymer substrate

2010

Evaluation of interfacial toughness of sub-micron-thickness layers deposited on a ductile substrate is a challenging task which has motivated different experimental approaches Fragmentation testing was used in the present study as a means of interface characterization of a silicon-nitride-coated polyimide substrate. During the test, after an initial rapid segmentation-cracking phase, the coating fragments developed edge delaminations which propagated in a stable manner with further increase in the applied strain The debonding process was modelled by the finite element method Incorporating a cohesive zone at the front of the interfacial crack The edge cracks were found to be dominated by mod…

ToughnessMaterials sciencePolymers and PlasticsTension testEfficiencyengineering.materialStressMechanicsFracture toughnessCoatingCoatingsPolymer substrateThin filmComposite materialFilmTensile testingDelaminationMetals and AlloysFinite element analysisCohesive-Zone ModelsForce MicroscopyElectronic Optical and Magnetic MaterialsCeramics and CompositesengineeringAdhesionToughnessLine StructuresFragmentation TestPolyimidePolyimide
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Optimization Strategy of Novel Peptide-Based Michael Acceptors for the Treatment of Human African Trypanosomiasis

2019

This paper describes an optimization strategy of the highly active vinyl ketone 3 which was recognized as a strong inhibitor of rhodesain of Trypanosoma brucei rhodesiense, endowed with a ksecond v...

Trypanosoma brucei rhodesienseStrong inhibitorKetoneStereochemistryProtein ConformationPeptide01 natural sciences03 medical and health sciencesStructure-Activity RelationshipSUBSTRATEDrug DiscoverymedicineHumansAfrican trypanosomiasisSulfonesBIOLOGICAL EVALUATION030304 developmental biologyWARHEADchemistry.chemical_classification0303 health sciencesMolecular StructureChemistryDERIVATIVESTrypanosoma brucei rhodesienseCYSTEINE PROTEASES RHODESAIN BIOLOGICAL EVALUATION CATHEPSIN-L INHIBITORS BRUCEI PEPTIDOMIMETICS FALCIPAIN-2 DERIVATIVES SUBSTRATE WARHEADBRUCEImedicine.diseaseFALCIPAIN-2Trypanocidal Agents0104 chemical sciences010404 medicinal & biomolecular chemistryCysteine EndopeptidasesTrypanosomiasis AfricanCYSTEINE PROTEASES RHODESAINCATHEPSIN-LMolecular MedicineINHIBITORSPEPTIDOMIMETICS
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ASSESSING SPREADABILITY OF WARM SEASON SPECIES USED FOR TURFGRASS ON THREE TYPES OF SUBSTRATE IN THE MEDITERRANEAN ENVIRONMENT

2014

The aim of the study was to examine the performance of turfgrass warm season species, including 6 varieties of Cynodon dactylon in comparison with Zoysia japonica and Paspalum vaginatum in three substrates with different soil textures (sandy loam, sandy clay loam, clay), to find the one or the ones that adapt best in the Mediterranean environment. The results showed the best perfomances in sandy loam substrate and for C.dactylon cv. Transcontinental, Capriola and La Paloma. Z. japonica, Zenith, had lower values.

Turfgrass substrate spreadability mediterranean environmentSettore AGR/02 - Agronomia E Coltivazioni Erbacee
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The 3'-UTR of the mRNA coding for the major protein kinase C substrate MARCKS contains a novel CU-rich element interacting with the mRNA stabilizing …

2003

The expression of the major protein kinase C substrate MARCKS (myristoylated alanine-rich C kinase substrate) is controlled by the stability of its mRNA. While the MARCKS mRNA is long living in quiescent fibroblasts (t1/2 = 14 h), its half-life time is drastically reduced (t1/2 = 2 h) in cells treated with phorbol esters to activate protein kinase C (PKC) or treated with growth factors. In a first step to study the underlying mechanism we identified both a cis-element on the MARCKS mRNA and the corresponding trans-acting factors. Fusing the complete 3'-UTR or specific regions of the 3'-UTR of the MARCKS gene to a luciferase reporter gene caused a drastic decrease in luciferase expression to…

Untranslated regionRecombinant Fusion ProteinsELAV-Like Protein 1Down-RegulationNerve Tissue ProteinsELAV-Like Protein 4BiologyBiochemistryELAV-Like Protein 1MiceGenes ReporterAnimalsRNA MessengerMARCKSLuciferasesMyristoylated Alanine-Rich C Kinase Substrate3' Untranslated RegionsProtein Kinase CProtein kinase CAU-rich elementMessenger RNAThree prime untranslated regionIntracellular Signaling Peptides and ProteinsMembrane ProteinsProteinsRNA-Binding Proteins3T3 CellsFibroblastsMolecular biologyELAV ProteinsAntigens SurfaceMARCKS GeneEuropean Journal of Biochemistry
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Synthesis, stability and spectral behavior of fluorogenic sulfone-pyronin and sulfone-rosamine dyes

2018

International audience; The first synthesis of sulfone-pyronin and sulfone-rosamine dyes bearing optically tunable primary amino groups (acting as fluorogenic centers) is presented. Sulfone analogs of xanthene-based fluorophores have recently been highlighted as a new class of near-infrared (NIR) fluorescent dyes (Liu et al. ACS Appl Mater Interfaces 2016; 8(35):22953-62), and the availability of fluorogenic derivatives is essential for the rapid construction of “turn-on” reactive probes for chemoselective bioimaging. However, these fluorescent anilines have been found to be unstable in aqueous physiological conditions due to the marked electrophilicity of their meso-position and hence its …

XantheneAqueous solutionPrimary (chemistry)NIR dye010405 organic chemistryHetero-xanthene dye[CHIM.ORGA]Chemical Sciences/Organic chemistryProcess Chemistry and TechnologyGeneral Chemical EngineeringFluorogenic enzyme substrateRosamine010402 general chemistry01 natural sciencesFluorescenceCombinatorial chemistry0104 chemical sciencesSulfonechemistry.chemical_compoundNucleophilechemistryElectrophileMoleculePyronin
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