Search results for "functional"

showing 10 items of 4822 documents

Weyl Type Theorems for Left and Right Polaroid Operators

2010

A bounded operator defined on a Banach space is said to be polaroid if every isolated point of the spectrum is a pole of the resolvent. In this paper we consider the two related notions of left and right polaroid, and explore them together with the condition of being a-polaroid. Moreover, the equivalences of Weyl type theorems and generalized Weyl type theorems are investigated for left and a-polaroid operators. As a consequence, we obtain a general framework which allows us to derive in a unified way many recent results, concerning Weyl type theorems (generalized or not) for important classes of operators.

Teoremi di Weyl operatori polaroidi SVEPLeft and rightPure mathematicsAlgebra and Number TheorySpectrum (functional analysis)Banach spaceType (model theory)Bounded operatorAlgebraIsolated pointSettore MAT/05 - Analisi MatematicaAnalysisResolventMathematicsIntegral Equations and Operator Theory
researchProduct

Synthesis of Nonplanar Graphene Nanoribbon with Fjord Edges

2021

As a new family of semiconductors, graphene nanoribbons (GNRs), nanometer-wide strips of graphene, have appeared as promising candidates for next-generation nanoelectronics. Out-of-plane deformation of π-frames in GNRs brings further opportunities for optical and electronic property tuning. Here we demonstrate a novel fjord-edged GNR (FGNR) with a nonplanar geometry obtained by regioselective cyclodehydrogenation. Triphenanthro-fused teropyrene 1 and pentaphenanthro-fused quateropyrene 2 were synthesized as model compounds, and single-crystal X-ray analysis revealed their helically twisted conformations arising from the [5]helicene substructures. The structures and photophysical properties …

Terahertz radiationCrystallography X-RayBiochemistryCatalysislaw.inventionchemistry.chemical_compoundsymbols.namesakeColloid and Surface ChemistrylawSpectroscopy Fourier Transform InfraredPolycyclic CompoundsDensity Functional TheoryPyrenesbusiness.industryGrapheneCommunicationStereoisomerismGeneral ChemistryNanostructuresSemiconductorHelicenechemistryNanoelectronicsChemical physicssymbolsDensity functional theoryGraphitebusinessRaman spectroscopyGraphene nanoribbons
researchProduct

Density Functional Theory Calculations On Magnetic Properties Of Actinide Compounds

2011

ABSTRACTWe have performed a detailed analysis of the magnetic (collinear and noncollinear) order and atomic and electron structures of UO2, PuO2 and UN on the basis of density functional theory with the Hubbard electron correlation correction (DFT+U). We have shown that the 3-k magnetic structure of UO2 is stabilized for the Hubbard parameter value of U=4.6 eV (while J=0.5 eV) when Dudarev’s formalism is used. UO2 keeps cubic shape in this structure. Two O atoms nearest to each U atom in direction of its magnetic moment move toward this U atom. Neither UN nor PuO2 shows the energetical preference for the rhombohedral distortion, in contrast to UO2, and, thus, no complex 3-k magnetic structu…

Tetragonal crystal systemMaterials scienceMagnetic momentCondensed matter physicsElectronic correlationMagnetic structureAtomDensity functional theoryElectronElectronic structureMRS Proceedings
researchProduct

The Dynamic Evolution of the Proximity Effect in the Textile Industry

2011

This paper tests the evolution of the relationship between localization and proximity and their effect on firm performance for a sample of 10,490 Spanish textile firms in the period 2001–2006. Using coefficients of specialization two levels of geographical disaggregation are distinguished: (i) the provincial cluster and (ii) the industrial district. The results obtained show a positive and significant impact of the specialization level on productivity, both for industrial districts and provincial clusters (in this case only when the levels of specialization are high enough). In general, the effect is higher for industrial districts than for provincial clusters, although in both cases it dec…

Textile industryEconomybusiness.industryGeography Planning and DevelopmentSpecialization (functional)Sample (statistics)Economic geographyBusinessProductivityEu countriesProximity effect (atomic physics)Industrial districtEuropean Planning Studies
researchProduct

Novel method for functionalising and patterning textile composites:Liquid resin print

2016

Abstract The paper reports a novel method of integrating resin into continuous textile reinforcement. The method presents a print of liquid reactive resin into textile preforms. A series of targeted injections forms a patch which upon consolidation and curing transforms into a stiff region continuously spanning through preform thickness. Enhancing the injected resin with conductive phase allows creating a pattern of patches with controlled dimensions and added functionalities. Patterned composites reveal features which are not typical for conventional composites such as fibre bridged interfaces, regular thickness variation, and gradient matrix properties. The presented study explores the ro…

Textile reinforcementA. Multifunctional compositesMaterials sciencetechnology industry and agricultureElectrically conductiveE. 3-D printingLiquid resin02 engineering and technologyBristol Composites Institute ACCIS010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesA. Carbon nanotubes and nanofibers0104 chemical sciencesMechanics of MaterialsCeramics and CompositesSurface modificationTextile compositeComposite materialB. Electrical properties0210 nano-technology/dk/atira/pure/core/keywords/composites_SRIElectrical conductorCuring (chemistry)
researchProduct

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.
researchProduct

Abitare nel reale. Dalla crisi della periferia alla tessitura di nuove relazioni contestuali

2019

I progetti redatti per “Palermo Sud-Est” sono il risultato di un Laboratorio di Laurea strutturatosi attraverso incontri, seminari, comunicazioni specialistiche, esposizioni critiche, che – in una strategia condivisa – ha visto ogni studente elaborare il proprio lavoro nel confronto con gli altri attori del Laboratorio stesso. La ricerca sui “progetti urbani” è stata impostata di modo che ogni laureando fosse messo a conoscenza dei progetti svolti nello stesso ambito territoriale dai colleghi che l’avevano preceduto, così da poter operare in continuità e contribuire a formulare un ragionamento unitario, nel quale ogni progetto costituisse continuazione, verifica o anche variante dei precede…

The projects prepared for "Palermo South-East" are the result of a Graduate Laboratory structured through meetings seminars specialist communications critical exhibitions which - in a shared strategy - saw each student elaborate their work in comparison with others actors of the same Laboratory. The research on "urban projects" was set so that each graduating student was made aware of the projects carried out in the same geographical area by the colleagues who had preceded it so as to be able to operate in continuity and contribute to formulating a unitary reasoning in which each project constituted continuation verification or even variant of the previous ones. These coordinated works have pursued two fundamental objectives: the strengthening of infrastructures and the establishment of specialized public buildings with superior functions aimed at requalifying and regenerating various critical situations with particular attention to the relationship between context and life scenarios. Thus each designer while dealing with a main functional program simultaneously deals with various issues such as the rationalization of the road system the redevelopment of existing buildings the design and refunctionalization of urban services (for example the transformed Central Station in the hotel or the project of a great Mosque)several degree theses have addressed as the main theme or as a question in the background the design of a new bed for the Oreto river and the relative establishment of a park facing it. In this desire to "patch up the wounds" in the different areas of "Palermo South-East" in close relationship with the vicissitudes of the place there is a continuous reference to architectures of all time and some questions involving the functional program are suggested - that identifies the character (or perhaps "type") of what is to be inserted in a given context - and the qualities of living reality as a pivotal material in the design process.Settore ICAR/14 - Composizione Architettonica E Urbana
researchProduct

Design e narrazioni

2022

Il testo nasce dall’esigenza di mettere a fuoco le implicazioni cognitive, metodologiche e progettuali del concetto di narrazione, sempre più ricorrente nella nostra esperienza quotidiana soprattutto per le molteplici forme di comunicazione e di produzioni culturali che vi si ispirano; si tratta di un concetto che anche nella riflessione teorica e nella progettualità del design sta alimentando dimensioni fortemente innovative ed evolutive nella costruzione, comunicazione di significati, contenuti immateriali, esperienze e valori emozionali che si sovrappongono e s’intrecciano all’espressione tangibile e funzionale degli oggetti, degli artefatti comunicativi, degli spazi. Si propone un perco…

The text arises from the need to focus on the cognitive methodological and design implications of the concept of storytelling increasingly recurrent in our daily experience especially for the many forms of communication and cultural productions that are inspired by itSettore ICAR/13 - Disegno Industrialeit is a concept that also in theoretical reflection and design planning is feeding strongly innovative and evolutionary dimensions in the construction communication of meanings intangible content experiences and emotional values that overlap and intertwine with the tangible and functional expression of objects communicative artifacts spaces.. It proposes a cognitive path tangent to the development of "narratology" and the theories of narrationthus we come across a multiplicity of disciplinary connections affecting sociology psychology anthropology philosophy semiotics and of course history cinema journalism advertising up to corporate communication and political propaganda. It is an articulated panorama that today seems to expand more and more and far from being mainly addressed to theoretical issues increasingly seems to be modeled on application performative and design aspects.
researchProduct

The evolution of technological inequalities: country effect vs industry composition

2013

PurposeUsing the EU‐KLEMS database for 12 countries and 16 industries, the purpose of this paper is to analyze the differences in technological capital intensity (R&D capital stock as a percentage of GVA) between industries and the evolution of inequalities between the EU‐11 and the USA, as well as between EU countries.Design/methodology/approachThe authors use shift‐share analysis and a Theil inequality index to break down these inequalities and to quantify the importance of either a country or a specialization effect.FindingsResults from the shift‐share analysis show that there was a technological gap in favor of the USA until the mid‐1990s linked to the greater accumulation of techno…

Theil indexIndex (economics)Inequalitybusiness.industrymedia_common.quotation_subjectEconomyManagement of Technology and InnovationCapital (economics)ManufacturingSpecialization (functional)Economicsmedia_common.cataloged_instanceCapital intensityEconomic geographyEuropean unionbusinessmedia_commonEuropean Journal of Innovation Management
researchProduct

Global Upscaling of the MODIS Land Cover with Google Earth Engine and Landsat Data

2021

Image classification has become one of the most common applications in remote sensing yielding to the creation of a variety of operational thematic maps at multiple spatio-temporal scales. The information contained in these maps summarizes key characteristics related with the physical environment and provides fundamental information of the Earth for vegetation monitoring or land use status over time. However, high spatial resolution land cover maps are usually only produced for specific small regions or in an image tile. We present a general methodology to obtain a high spatial resolution land cover maps using Landsat spectral information, the powerful Google Earth Engine platform, and oper…

Thematic mapContextual image classificationLand useComputer scienceRemote sensing (archaeology)ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONLand coverVegetationPlant functional typeImage resolutionRemote sensing2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS
researchProduct