Search results for "DEVICES"

showing 10 items of 615 documents

Iridium(III) Complexes with Phenyl-tetrazoles as Cyclometalating Ligands

2014

Ir(II) cationic complexes with cyclometalating tetrazolate ligands were prepared for the first time, following a two-step strategy based on (i) a silver-assisted cyclometalation reaction of a tetrazole derivative with IrCl3 affording a bis-cyclometalated solvato-complex P ([Ir(ptrz)(2)(CH3CN)(2)](+), Hptrz = 2-methyl-5-phenyl-2H-tetrazole); (ii) a substitution reaction with five neutral ancillary ligands to get [Ir(ptrz)(2)L](+), with L = 2,2'-bypiridine (1), 4,4'-di-tert-butyl-2,2'-bipyridine (2), 1,10-phenanthroline (3), and 2-(1-phenyl-1H-1,2,3-triazol-4-yl)pyridine (4), and [Ir(ptrz)(2)L-2](+), with L = tertbutyl isocyanide (5). X-ray crystal structures of P, 2, and 3 were solved. Elect…

Substitution reactionIr(III) complexePhenanthrolineIsocyanidechemistry.chemical_elementphenyl tetrazolesPhotochemistryMedicinal chemistryInorganic Chemistrychemistry.chemical_compoundBipyridinechemistryPyridineEMITTING ELECTROCHEMICAL-CELLS; TRANSITION-METAL-COMPLEXES; IR(III) COMPLEXES; ELECTROLUMINESCENT DEVICES; ANCILLARY LIGAND; SOLID-STATE; PHOTOPHYSICAL PROPERTIES; POLYPYRIDINE COMPLEXES; BLUE PHOSPHORESCENCE; ISOCYANIDE COMPLEXESTetrazoleIridiumPhysical and Theoretical ChemistryAcetonitrile
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Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers

2022

The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a linear phase-preserving amplifier, in this contribution we analyze some of the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherents). Furthermore, we present an analysis of the output signals generated by the parametric amplification mechanism when thermal noise fluctuations feed the device.

Superconducting microwave devicesMicrowave photonicMicrowave amplifiersCondensed Matter - SuperconductivityPhysicsFOS: Physical sciencesMicrowave photonics Noise figure Superconducting microwave devices.Condensed Matter PhysicsNoise figureSettore ING-INF/01 - ElettronicaSuperconducting microwave deviceElectronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)BandwidthMicrowave amplifierBandwidth; Gain; Microwave amplifiers; Microwave photonics; Noise figure; Physics; Superconducting microwave devicesMicrowave photonicsHardware_INTEGRATEDCIRCUITSPhysicGainElectrical and Electronic EngineeringPhysics Gain Microwave amplifiers Noise figure Superconducting microwave devices Microwave photonics Bandwidth Microwave photonics noise figure superconducting microwave devicesMicrowave photonics; Noise figure; Superconducting microwave devicesIEEE Transactions on Applied Superconductivity
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Impact of non-idealities on the conductance characteristics of superconductor-insulator-normal metal-insulator-superconductor tunnel junctions

2012

We have investigated the effect of asymmetry in tunnelling resistance of individual normal metal-insulator-superconductor (NIS) tunnel junctions that constitute a SINIS pair, both experimentally and theoretically. Ours results clearly demonstrate that any finite asymmetry in the tunnelling resistance gives rise to an excess current, as compared to its symmetric counterpart, both below and around the gap edge. The signature of this excess current is visible almost up to the critical temperature. We find that this apparent broadening of the density of states is purely electrical in origin. Our calculations also show that any finite resistance that is in series with the tunnelling resistance, …

SuperconductivityHistoryCondensed matter physicsChemistrymedia_common.quotation_subjectConductanceInsulator (electricity)AsymmetryComputer Science ApplicationsEducationlaw.inventionlawDensity of statesSuperconductivity Electronics and devicesResistorQuantum tunnellingVoltage dropmedia_common
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Critical current modulation induced by an electric field in superconducting tungsten-carbon nanowires

2021

The critical current of a superconducting nanostructure can be suppressed by applying an electric field in its vicinity. This phenomenon is investigated throughout the fabrication and electrical characterization of superconducting tungsten-carbon (W-C) nanostructures grown by Ga+ focused ion beam induced deposition (FIBID). In a 45 nm-wide, 2.7 μm-long W-C nanowire, an increasing side-gate voltage is found to progressively reduce the critical current of the device, down to a full suppression of the superconducting state below its critical temperature. This modulation is accounted for by the squeezing of the superconducting current by the electric field within a theoretical model based on th…

SuperconductivityMultidisciplinaryMaterials scienceCondensed matter physicsScienceQRNanowireCritical valueFocused ion beamArticleSuperconducting properties and materialsSputteringCondensed Matter::SuperconductivityElectric fieldSuperconducting devicesMedicineElectron-beam lithographyVoltageScientific Reports
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Lifetime of the superconductive state in short and long Josephson junctions

2008

We study the transient statistical properties of short and long Josephson junctions under the influence of thermal and correlated fluctuations. In particular, we investigate the lifetime of the superconductive metastable state finding the presence of noise induced phenomena. For short Josephson junctions we investigate the lifetime as a function both of the frequency of the current driving signal and the noise intensity and we find how these noise-induced effects are modified by the presence of a correlated noise source. For long Josephson junctions we integrate numerically the sine-Gordon equation calculating the lifetime as a function of the length of the junction both for inhomogeneous a…

SuperconductivityPhysicsJosephson effectCondensed matter physicsCondensed Matter - SuperconductivityFOS: Physical sciencesBiasingCondensed Matter PhysicsSignalNoise (electronics)Settore FIS/03 - Fisica Della MateriaElectronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)MetastabilityCondensed Matter::SuperconductivityComputational methods in statistical physics and nonlinear dynamics Noise Fluctuations Josephson devices.Transient (oscillation)Maxima
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ULTRA-BROADBAND COHERENT DETECTION OF TERAHERTZ PULSES VIA CMOS-COMPATIBLE SOLID-STATE DEVICES

Il presente lavoro di tesi presenta e dimostra una tecnica innovativa e completamente integrata dedita alla rilevazione coerente di radiazioni a frequenze Terahertz (THz), cioè di onde elettromagnetiche il cui contenuto frequenziale cade convenzionalmente nella finestra spettrale compresa tra 0.1-10x1012 Hz. Tale tecnica è stata battezzata col nome di solid-state-biased coherent detection (SSBCD), dal momento che essa sfrutta le proprietà di un mezzo a stato solido e consente di ricostruire simultaneamente l’informazione sulla fase e sull’ampiezza degli impulsi THz, anche nel caso in cui quest’ultimi siano dotati di spettri a banda cosiddetta “ultra larga” (> 10 THz). Tale metodo di rivelaz…

THz TechnologySolid-state devicesNonlinear OpticsUltrafast OpticsSettore ING-INF/01 - Elettronica
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Improved time-resolved acousto-optic technique for optical fiber analysis of axial non-uniformities by using edge interrogation

2015

The time-resolved acousto-optic technique demonstrated recently to be a very useful method for the analysis of fiber axial non-uniformities, able to detect variations of fiber diameter in the nanometric scale with a spatial resolution of few cm. An edge interrogation approach is proposed to improve further the performance of this technique. The detection of subnanometer fiber diameter changes or sub-ppm changes of the core refractive index is demonstrated.

TechnologyOptical fiberMaterials sciencePhysics::OpticsPolarization-maintaining optical fiber02 engineering and technology01 natural sciencesGraded-index fiberlaw.invention010309 opticsFiber characterization020210 optoelectronics & photonicsOpticsAcousto-optical devicesFiber Bragg gratinglaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringDispersion-shifted fiberTECHNOLOGYCiencias tecnológicasbusiness.industryMicrostructured optical fiberÒpticaAtomic and Molecular Physics and OpticsFiber optic sensorCIENCIAS TECNOLÓGICASElectrónicasense organsElectronicsbusinessPhotonic-crystal fiberOptics Express
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The magnet of the scattering and neutrino detector for the SHiP experiment at CERN

2019

The Search for Hidden Particles (SHiP) experiment proposal at CERN demands a dedicated dipole magnet for its scattering and neutrino detector. This requires a very large volume to be uniformly magnetized at B > 1.2 T, with constraints regarding the inner instrumented volume as well as the external region, where no massive structures are allowed and only an extremely low stray field is admitted. In this paper we report the main technical challenges and the relevant design options providing a comprehensive design for the magnet of the SHiP Scattering and Neutrino Detector.

TechnologyPhysics - Instrumentation and Detectorswigglers and undulators)magnet: designPermanent magnet devicesPhysics::Instrumentation and Detectorsengineering01 natural sciences7. Clean energy09 Engineering030218 nuclear medicine & medical imagingradiation hardened magnetsSubatomär fysik0302 clinical medicineDipole magnetSubatomic PhysicsNeutrino detectorsDetectors and Experimental TechniquesInstruments & InstrumentationInstrumentationphysics.ins-detAcceleration cavities and magnets superconducting (high-temperature superconductor; radiation hardened magnets; normal-conducting; permanent magnet devices; wigglers and undulators)Mathematical PhysicsPhysics02 Physical SciencesLarge Hadron ColliderInstrumentation and Detectors (physics.ins-det)magnet: technologyNuclear & Particles Physicsbending magnetneutrino: detectorNeutrino detectornormal-conductingAcceleration cavities and magnets superconducting (high-temperature superconductorproposed experimentCERN LabRadiation hardened magnetsFOS: Physical sciencesNormal-conductingAccelerator Physics and InstrumentationNuclear physics03 medical and health sciences0103 physical sciencespermanent magnet devices[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]Wigglers and undulators)normal-conducting magnetsScience & Technology010308 nuclear & particles physicsScatteringLarge detector systems for particle and astroparticle physicsAcceleratorfysik och instrumenteringLarge detector systems for particle physicsHigh temperature superconductors Neutrons Permanent magnets Ships Superconducting magnets Wigglers Astroparticle physics Comprehensive designs Massive structures Neutrino detectors Normal-conducting Radiation-hardened Ship experiments Technical challenges Particle detectorsVolume (thermodynamics)MagnetAcceleration cavities and magnets superconducting (high-temperature superconductor; Large detector systems for particle and astroparticle physics; Neutrino detectors; Normal-conducting; Permanent magnet devices; Radiation hardened magnets; Wigglers and undulators)High Energy Physics::Experimentneutrino detectors
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Root repair after damage due to screw insertion for orthodontic miniplate placement

2019

Background: The aim of this investigation was to describe the healing reactions following root damage caused by placement of a miniplate anchorage system.Material and Methods: In 4 beagle dogs, 4 titanium miniplates (2 self-tapping screws per miniplate) were placed in each maxilla, after drilling of pilot-holes. Six fixation screws were unintentionally inserted damaging the root of maxillary canines. Two weeks later, half of the miniplates were loaded with a coil spring. Two dogs were euthanized 7 weeks after placement of the miniplates, while the remaining two after 29 weeks. Histological sections were prepared, microradiographed, observed under U.V. light, then stained and analysed under …

Temporary anchorage devicesOrthodonticsRoot resorption02 engineering and technologyRoot resorption03 medical and health sciences0302 clinical medicineMedicinePeriodontal fiberCementumGeneral DentistryAnimal studies; Root resorption; Temporary anchorage devicesFixation (histology)Orthodonticsbusiness.industrytemporary enchorage devicesResearch030206 dentistryTissue repair:CIENCIAS MÉDICAS [UNESCO]021001 nanoscience & nanotechnologymedicine.diseaseAnimal studiesanimal studiesmedicine.anatomical_structureMaxillaUNESCO::CIENCIAS MÉDICASroot resorption0210 nano-technologybusiness
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Master-Slave Control of Battery/Supercapacitor Based Hybrid Energy Storage System for E-Vehicle Application

2022

In this paper, management and control problem of hybrid energy storage system (HESS) has been solved by master-slave control strategy. Heuristic fuzzy rules based algorithm is developed for optimal power sharing between different power sources. The master control is followed by a slave level controller, designed by using terminal synergetic control method for tracking. Moreover, the stability analysis of closed-loop system has been carried out by using lyapunov theory. Finally, the proposed method has been tested in MATLAB/Simulink environment under Worldwide Harmonised Light Vehicle Test Procedure (WLTP).

Terminal synergetic controlEnergy storage devices(ESDs)Hybrid energy storage systemElectric vehicleFuzzy controlSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici2022 11th International Conference on Renewable Energy Research and Application (ICRERA)
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