Search results for "Capacitance"

showing 10 items of 112 documents

Sensing properties of ZnO nanostructured layers

2017

Nanostructured ZnO layers have been deposited onto SiO 2 /Si substrates by spray pyrolysis, with previously patterned interdigitated gold electrodes. We have then measured the capacitive and resistive response against ambient parameters such as relative humidity and illumination.

Resistive touchscreenMaterials scienceCapacitive sensingHumiditychemistry.chemical_elementZincCapacitanceSpray pyrolysisSemiconductorschemistryElectrodeElectronic engineeringRelative humidityMaterials nanoestructuratsComposite material2017 Spanish Conference on Electron Devices (CDE)
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A Design Methodology for Low-Power MCML Ring Oscillators

2007

In this paper, a low-power design method for MCML based ring oscillators is presented. The proposed method takes into account the parasitic capacitances of the MOS transistors. To validate it, some ring oscillators with different oscillation frequencies were designed in a 0.18 mum CMOS technology. SPICE simulations demonstrate the effectiveness of the design method.

Ring (mathematics)EngineeringDesign methodology Ring oscillators Inverters Circuits Frequency Parasitic capacitance CMOS technology Propagation delay Voltage Telecommunicationsbusiness.industryTransistorSpiceElectrical engineeringHardware_PERFORMANCEANDRELIABILITYIntegrated circuit designSettore ING-INF/01 - ElettronicaComputer Science::Otherlaw.inventionPower (physics)Computer Science::Hardware ArchitectureComputer Science::Emerging TechnologiesCMOSlawLow-power electronicsMOSFETHardware_INTEGRATEDCIRCUITSElectronic engineeringbusinessHardware_LOGICDESIGN
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<title>Scanning probe microscopy of nanocrystalline iridium oxide thin films</title>

2003

Structural investigations of nanocrystalline iridium oxide thin films, prepared by dc magnetron sputtering technique were performed by scanning probe microscopy (SPM). SPM studies, using both atomic force microscopy (AFM) and scanning tunnelling microscopy (STM), indicate that the thin films are composed of grains with a size of about 20-50 nm. Fine crystallinity and small RMS microroughness of the films, being well below 2 nm, make iridium oxide thin films promising candidates for nanolithographic applications. The possibility to perform nanolithograhpic processes at a scale of less than 150 nm was successfully examined in AFM and STM modes.© (2003) COPYRIGHT SPIE--The International Societ…

Scanning probe microscopyMaterials scienceScanning confocal electron microscopyScanning ion-conductance microscopyNanotechnologyConductive atomic force microscopyScanning capacitance microscopyPhotoconductive atomic force microscopyVibrational analysis with scanning probe microscopyNanocrystalline materialSPIE Proceedings
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The Effect of Anodizing Bath Composition on the Electronic Properties of Anodic Ta-Nb Mixed Oxides

2022

Anodic oxides were grown to 50 V on Ta-Nb sputtering deposited alloys, with high Nb content, in acetate ions containing an aqueous solution to study the effect of the anodizing bath composition on anodic layers’ dielectric properties. Photoelectrochemical measurements proved the presence of a photocurrent in the band gap of photon energy lower than oxides, due to optical transitions involving localized electronic states as a consequence of acetate ions incorporation. Flat band potential value estimates assessed the insulating nature of the anodic oxides grown in the acetate buffer solution. Differential capacitance measurements showed that the highest capacitance value was measured for the …

Settore ING-IND/23 - Chimica Fisica ApplicataNb oxide Ta oxide anodizing capacitance electrolytic capacitors mixed oxidesGeneral Chemical Engineeringanodizing; capacitance; electrolytic capacitors; mixed oxides; Ta oxide; Nb oxideGeneral Materials ScienceNanomaterials; Volume 12; Issue 24; Pages: 4439
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Numerical approach for signal delay in general distributed networks

2003

The authors consider a general network with telegraph equations modelling distributed elements and having, additionally, nonlinear capacitors. A global asymptotic exponential stability of the solution is given. A simple computable upper bound of the delay time is given. Numerical examples illustrate the usefulness of the results. >

Signal delayNumerical analysisMathematical analysisTime-scale calculusLambdaUpper and lower boundslaw.inventionNonlinear capacitanceCapacitorTheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGESIntelligent NetworkExponential stabilityControl theorySimple (abstract algebra)lawApplied mathematicsDelay timeHardware_LOGICDESIGNMathematicsNetwork analysisVoltage[1987] NASECODE V: Proceedings of the Fifth International Conference on the Numerical Analysis of Semiconductor Devices and Integrated Circuits
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Closure to “Laboratory and Field Calibration of the Diviner 2000 Probe in Two Types of Soil” by J. Haberland, R. Gálvez, C. Kremer, and C. Carter

2015

The authors deal with the quite interesting and actual problem of Diviner 2000 capacitance probe calibration and present some field and laboratory data obtained on two different layers (0–0.26 and 0.26–0.50 cm) of the same soil profile, characterized by different textural class. The importance of site-specific calibration of sensors used to monitor soil or plant water status assumes a particular relevance in semiarid environments where the application of precision irrigation represents an appropriate management strategy aimed to achieve high values of water use efficiency (Cammalleri et al. 2013). Moreover, in clay soils, physical properties are strongly influenced by soil water content (Pr…

Soil scienceSoil typeAgricultural and Biological Sciences (miscellaneous)Soil waterSoil horizonEnvironmental scienceField calibrationGeotechnical engineeringCapacitance probeWater-use efficiencyAir gap (plumbing)Water Science and TechnologyCivil and Structural EngineeringDivinerJournal of Irrigation and Drainage Engineering
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Assessing Field and Laboratory Calibration Protocols for the Diviner 2000 Probe in a Range of Soils with Different Textures

2016

Frequency domain reflectometry (FDR) downhole sensors have been increasingly used for soil moisture field monitoring because they allow measurement, even continuously, along a soil profile. Moreover, they can also be installed with minimal soil disturbance around the access tube. The objectives of the paper were to assess the field and laboratory calibration protocols for a FDR capacitance probe (Diviner 2000) for a range of soils characterized by different particle size distributions and shrink/swell potential and to propose a practical and effective protocol on the basis of undisturbed soil samples, accounting for soil shrinkage/swelling processes characterizing swelling clay soils. The e…

Soil test0208 environmental biotechnologyShrinking/swellings soilCalibration protocolsSoil science02 engineering and technologySoil water contentCapacitance probeFrequency domain reflectometry (FDR); Capacitance probe; Soil water content; Dielectric permittivity; Shrinking/ swellings soils; Calibration protocols.Dielectric permittivityShrinking/ swellings soilsCalibrationReflectometryFrequency domain reflectometry (FDR)Water contentWater Science and TechnologyCivil and Structural EngineeringCalibration protocol04 agricultural and veterinary sciencesAgricultural and Biological Sciences (miscellaneous)Swell020801 environmental engineeringSoil water040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental scienceSoil horizonCapacitance probeJournal of Irrigation and Drainage Engineering
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A High-Performance Asymmetric Supercapacitor Based on Tungsten Oxide Nanoplates and Highly Reduced Graphene Oxide Electrodes.

2021

Tungsten oxide/graphene hybrid materials are attractive semiconductors for energy-related applications. Herein, we report an asymmetric supercapacitor (ASC, HRG//m-WO3 ASC), fabricated from monoclinic tungsten oxide (m-WO3 ) nanoplates as a negative electrode and highly reduced graphene oxide (HRG) as a positive electrode material. The supercapacitor performance of the prepared electrodes was evaluated in an aqueous electrolyte (1 m H2 SO4 ) using three- and two-electrode systems. The HRG//m-WO3 ASC exhibits a maximum specific capacitance of 389 F g-1 at a current density of 0.5 A g-1 , with an associated high energy density of 93 Wh kg-1 at a power density of 500 W kg-1 in a wide 1.6 V ope…

Supercapacitor010405 organic chemistryGrapheneOrganic ChemistryOxideGeneral Chemistry010402 general chemistryElectrochemistry01 natural sciencesCapacitanceCatalysis0104 chemical scienceslaw.inventionchemistry.chemical_compoundchemistryChemical engineeringlawElectrodeHybrid materialCurrent densityChemistry (Weinheim an der Bergstrasse, Germany)
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Electronically conducting polymers and activated carbon: Electrode materials in supercapacitor technology

1996

SupercapacitorConductive polymerElectrode materialMaterials scienceMechanical EngineeringNanotechnologyCapacitanceMechanics of MaterialsPolymer chemistrymedicineGeneral Materials ScienceElectrical conductorActivated carbonmedicine.drugAdvanced Materials
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Supercapacitor diagnosis using an Extended Kalman Filtering approach

2016

This paper deals with the model-based analysis of a Supercapacitor for diagnostic purposes. A two legs nonlinear physical model is assumed for the Supercapacitor and the corresponding second-order nonlinear state-space mathematical model is obtained. Then, an Extended Kalman Filter is tuned so that the estimated outputs reproduce the voltages at the equivalent capacitance terminals; they give information on the state of health of the supercapacitor but are not directly measurable. In particular, an optimization problem is firstly formulated, involving the experimental input-output data and those given by the Extended Kalman Filter.

SupercapacitorEngineeringOptimization problembusiness.industry020209 energy020208 electrical & electronic engineering02 engineering and technologyKalman filterCapacitanceInvariant extended Kalman filterNonlinear systemExtended Kalman filterControl theory0202 electrical engineering electronic engineering information engineeringFast Kalman filterbusiness2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)
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