Search results for "Witch"

showing 10 items of 542 documents

Design and implementation of a portable fNIRS embedded system

2015

We report on the design, development and operation of a portable, low cost, battery-operated, multi-channel, functional Near Infrared Spectroscopy embedded system, hosting up to 64 optical sources and 128 Silicon PhotoMultiplier optical detectors. The system is realized as a scalable architecture, whose elementary leaf consists of a probe board provided with 16 SiPMs, 4 couples of bi-color LED, and a temperature sensor, built on a flexible stand. The hardware structure is very versatile because it is possible to handle both the switching time of the LED and the acquisition of the photodetectors, via an ARM based microcontroller.

Optical detectorsbusiness.industryComputer sciencePhotodetectorInfrared spectroscopyScalable architectureSilicon photomultiplierSettore ING-INF/01 - ElettronicaIndustrial and Manufacturing EngineeringSwitching timeMicrocontrollerSilicon photomultiplierEmbedded systemFunctional near-infrared spectroscopyFNIRS embedded systembusinessInfrared spectroscopyComputer hardware
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Active plasmonics in WDM traffic switching applications

2012

With metal stripes being intrinsic components of plasmonic waveguides, plasmonics provides a "naturally" energy-efficient platform for merging broadband optical links with intelligent electronic processing, instigating a great promise for low-power and small-footprint active functional circuitry. The first active Dielectric-Loaded Surface Plasmon Polariton (DLSPP) thermo-optic (TO) switches with successful performance in single-channel 10 Gb/s data traffic environments have led the inroad towards bringing low-power active plasmonics in practical traffic applications. In this article, we introduce active plasmonics into Wavelength Division Multiplexed (WDM) switching applications, using the …

Optical fiberComputer scienceTRANSMISSIONTransducersSilicon on insulator02 engineering and technology01 natural sciencesMultiplexingArticlelaw.invention010309 opticsMetalPOWER THERMOOPTICAL SWITCHlawWavelength-division multiplexing0103 physical sciencesElectronic engineeringFiber Optic TechnologySurface plasmon resonanceSILICON-ON-INSULATORPlasmonElectronic circuitMultidisciplinaryCHIPReproducibility of ResultsEquipment DesignSurface Plasmon ResonancePERFORMANCE021001 nanoscience & nanotechnologyChipSurface plasmon polaritonInterferometryWavelengthInterferometryTransducerPlasmonic waveguidevisual_artTelecommunicationsvisual_art.visual_art_mediumPOLARITON WAVE-GUIDES0210 nano-technology
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Q switching and mode locking pulse generation from an all-fiber ring laser by intermodal acousto-optic bandpass modulation

2018

Q-switched and mode-locked (QML) pulse generation from an all-fiber ring laser based on intermodal acousto-optic bandpass modulation is reported. The modulator relies on full-acousto-optic mode re-coupling cycle induced by a standing flexural acoustic wave, with a transmission response that is controlled by amplitude modulation of the acoustic wave signal. The Q factor of the cavity is controlled by a rectangular pulse wave with variable frequency and duty cycle, whereas mode locking is achieved by amplitude modulation derived from a standing flexural acoustic wave. The best QML pulses were obtained at 0.5 kHz repetition rate, with a pump power of 549.2 mW, at the optical wavelength of 1568…

Optical fiberMaterials scienceRing laser02 engineering and technologyFiber optics01 natural sciencesIndustrial and Manufacturing Engineeringlaw.invention010309 opticsFiber lasers020210 optoelectronics & photonicsOpticsBand-pass filterlaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringInstrumentationAcousto-optic modulationbusiness.industryCondensed Matter PhysicsQ-switchingAtomic and Molecular Physics and OpticsUNESCO::FÍSICA::Óptica ::Fibras ópticasPulse (physics)Q-switched and mode-lockedAll fiberMode-lockingModulation:FÍSICA::Óptica ::Fibras ópticas [UNESCO]business
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Enhanced supercontinuum generation in the nanosecond pump regime using specialty microstructured fibers

2009

Several alternatives have been investigated to achieve enhanced supercontinuum generation in the nanosecond pump regime using specialty silica-based microstructured optical fibers (MOFs). Among these alternatives we can point out the use of (a) MOF tapers, (b) highly Ge-doped core Y-shaped MOF and (c) Er-doped MOF. These specialty MOFs provide either an increased material nonlinear response or a rather small effective area, at the same time that the dispersion characteristics are adjusted to work at different excitation conditions. In our experiments, we have been using either a Q-switched Nd:YAG laser (10 Hz repetition rate) or an Yb-doped fiber laser (2 kHz repetition rate), both emitting…

Optical fiberMaterials sciencebusiness.industryNonlinear opticsNanosecondLaserQ-switchingSupercontinuumlaw.inventionOptical pumpingOpticslawFiber laserOptoelectronicsbusiness2009 11th International Conference on Transparent Optical Networks
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Supercontinuum Q-switched Yb fiber laser using an intracavity microstructured fiber

2009

We report on an intracavity configuration for supercontinuum generation in a Q-switched Yb fiber laser. The supercontinuum laser includes a section of microstructured fiber within the Q-switched laser cavity. With 380 mW of pump power, the supercontinuum laser can emit broadband pulses of 6 microJ energy and 10 ns temporal width, at repetition rates from few hertz up to 2 kHz. The supercontinuum spectrum spans over a wavelength range in excess of 1.4 microm.

Optical fiberMaterials sciencebusiness.industryWavelength rangeQ-switchingAtomic and Molecular Physics and Opticslaw.inventionSupercontinuumOpticslawOptical cavityFiber laserBroadbandFiberbusiness
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Computer Aided Optimal Design of High Power Density EMI Filters

2016

Power density of power converter systems is becoming an increasingly stringent design constraint for a wide range of applications. Size reduction of EMI filter in power converters is an important aspect due to its significant impact on the overall converter volume and weight. In order to take on this issue, a computer aided procedure for a fast selection of optimal discrete EMI filter components and configuration is described in this paper. The proposed technique is a rule-based automatic procedure based on suitable databases that consider datasheets information of commercially available passive components (e.g. magnetic cores, capacitors). It allows the minimization of the filter's volume …

Optimal designEngineeringEMI filterSwitched-mode power supplyEnergy Engineering and Power Technology02 engineering and technologySettore ING-INF/01 - ElettronicaElectromagnetic interferencelaw.inventionEMIlaw0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringPower densitybusiness.industryRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringElectrical engineering020206 networking & telecommunicationsPower converterPower (physics)Power densityCapacitorSettore ING-IND/31 - ElettrotecnicaFilter (video)visual_artElectronic componentvisual_art.visual_art_mediumbusiness
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User bandwidth usage-driven HNN neuron excitation method for maximum resource utilization within packet-switched communication networks

2006

Mobile and wireless systems beyond 3G are being designed under the user-centric paradigm. Dynamic resource allocation (DRA) is a topic on intensive research to address efficiently such paradigm. Hopfield neural networks (HNN) have proved useful in the past to solve this kind of complex optimization problems. Recently, various approaches have been proposed to realize HNN-based user-centric DRA. However, the initial algorithms suffer from severe instability problems impacting the overall performance. This letter analyses the source of the existing limitations and proposes an enhanced formulation, ensuring maximum resource utilization while optimizing the convergence of the neural network. The…

Optimization problemArtificial neural networkWireless networkbusiness.industryComputer scienceDistributed computingTelecommunications networkComputer Science ApplicationsPacket switchingBandwidth allocationModeling and SimulationBandwidth (computing)Resource allocationResource managementElectrical and Electronic EngineeringbusinessComputer networkIEEE Communications Letters
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Switching from Transdermal Drugs: An Observational "N of 1" Study of Fentanyl and Buprenorphine

2007

The aim of this study was to confirm that the concomitant presence of transdermal fentanyl (TTS FE) and buprenorphine (TTS BU) may be feasible without important consequences, using doses presumed to be equianalgesic. A prospective "N of 1" study was carried out in a sample of volunteers with cancer pain receiving stable doses of TTS FE or TTS BU, with adequate pain and symptom control. In the study design, each patient provided data before and after a switch from one opioid to the other and then back to the previous one. Sixteen patients receiving daily stable doses of 0.6 or 1.2 mg of TTS FE were switched to TTS BU using an FE-BU ratio of 0.6-0.8. After three days, the TTS BU patch was rem…

OralAdultMaletransdermal buprenorphinePainAdministration OralOpioidAdministration CutaneousFentanylopioid switchingNeoplasmsMedicineHumansDosingProspective StudiesCancer painNursing (all)2901 Nursing (miscellaneous)General NursingTransdermalAgedPain MeasurementIntractableAnalgesicsbusiness.industryMiddle AgedEquianalgesictransdermal fentanylBuprenorphinePain IntractableAnalgesics OpioidFentanylCutaneousAnesthesiology and Pain MedicineNeurologyOpioidConcomitantAnesthesiaCancer pain; opioid switching; transdermal buprenorphine; transdermal fentanyl; Administration Oral; Adult; Aged; Analgesics Opioid; Buprenorphine; Female; Fentanyl; Humans; Male; Middle Aged; Neoplasms; Pain Measurement; Pain Intractable; Prospective Studies; Administration Cutaneous; Anesthesiology and Pain Medicine; Neurology (clinical); Neurology; Nursing (all)2901 Nursing (miscellaneous)AdministrationFemaleNeurology (clinical)businessCancer painmedicine.drugBuprenorphine
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Experimental investigation of a hantavirus host-switch between arvicoline rodents Lemmus lemmus and Myodes glareolus

2014

Orthohantavirus0303 health sciencesEcologyArvicolinae030306 microbiologyZoologyMyodes glareolusHost switchBiology03 medical and health sciencesAnimalsEcology Evolution Behavior and Systematics030304 developmental biologyHantavirus
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H<inf>∞</inf> synchronization of Markovian jump master-slave systems with delay

2012

The problem of synchronization is investigated for a class of master-slave systems with time-varying delays and Markovian switching parameters. Using an appropriate Lyapunov-Krasovskii functional, a synchronization law which includes the master-slave parameters is established for designing a mode-dependent output feedback control law in terms of LMIs. A numerical example is given to show the effectiveness of the method.

Output feedbackMarkovian jumpComputer Science::Systems and ControlControl theoryH controlMaster/slaveMarkovian switchingSynchronizationMathematics2012 12th International Conference on Control Automation Robotics & Vision (ICARCV)
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