Wyniki wyszukiwania dla: DUAL ACTIVE BRIDGE (DAB) DC-DC CONVERTER

• Digital harmonic analysis of cadmium ion reduction on a dropping mercury electrode

  Publikacja

  • K. Darowicki
  • A. Krakowiak

  - RUSSIAN JOURNAL OF ELECTROCHEMISTRY - Rok 2003

  Badano redukcję jonów kadmu na rtęciowej elektrodzie kroplowej. Jako pobudzenie zastosowano sinusoidalny sygnał napięciowy nałożony na liniowo zmieniający się potencjał dc. Przeprowadzono analizę czasowo-częstotliwościową prądu polarograficznego dla reakcji redukcji jonu kadmu na rtęciowej elektrodzie kroplowej. Klasyczna transformacja Fouriera prowadzi do dekompozycji prądu polarograficznego na składowe harmoniczne. Harmoniczne...

• Evaluating the position of a mobile robot using accelerometer data

  Publikacja

  • Z. Kowalczuk
  • T. Merta

  - Rok 2016

  This paper analyses the problem of determining the position of a robot using an accelerometer, which is an essential part of inertial measurement units (IMU). The information gained from such a gauge, however, requires double integration of sensor data. To assure an expected effect, a mathematical model of a low-cost accelerometer of the MEMS type is derived. Moreover, in order to improve the performance of positioning based on...

• Evaluating the mobile robot positions using accelerometer data

  Publikacja

  • Z. Kowalczuk
  • T. Merta

  - Rok 2015

  This paper analyzes the problem of determining the position of a robot using an accelerometer, which is an essential part of inertial measurement units (IMU). The information gained from such a gauge, however, requires double integration of sensor data. To assure an expected effect, a mathematical model of a low-cost accelerometer of the MEMS type is derived. Moreover, in order to improve the performance of positioning based on...

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• Multilevel inverter neutral-point voltage sensor diagnostic based on the Extended Kalman Filter

  Publikacja

  • P. Szczepankowski
  • P. Kołodziejek

  - Rok 2013

  A new algorithm for neutral point voltage imbalance estimation in DC link of the three-level (3L) neutral point clamped (NPC) voltage source inverter (VSI) is proposed. Application of the proposed algorithm does not require any additional sensors. The unbalanced voltage calculation is based on the information derived from the inverter output measured currents and from the knowledge of the load model parameters. In order to estimate...

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• Analytical comparison between capacitor assisted and diode assisted cascaded quasi-z-source inverters

  Publikacja

  • D. Vinnikov
  • I. Roasto
  • T. Jalakas
  • R. Strzelecki
  • M. Adamowicz

  - Przegląd Elektrotechniczny - Rok 2012

  Quasi-Z falownik z prostym obwodem impedancyjnym jest bardzo interesującym rozwiązaniem topologicznym ze względu na unikalną możliwość jednostopniowego przekształcanie DC/AC w połączeniu z funkcjami obniżania i podwyższania napięcia. W niektórych aplikacjach jego właściwości podwyższające są jednak niewystarczające. Wyższe napięcie wejściowe można uzyskać w wyniku zastosowania w quasi-Z-falownikach kaskadowych obwodów impedancyjnych....

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• Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite

  Publikacja

  • A. D. Mielewczyk-Gryń
  • T. Lendze
  • K. Gdula-Kasica
  • P. Jasiński
  • A. Krupa
  • B. Kusz
  • M. Gazda

  - CENTRAL EUROPEAN JOURNAL OF PHYSICS - Rok 2013

  A composite of CaTi0.9Fe0.1O3 and electrolyte material, i.e. magnesium doped La0.98Mg0.02NbO4 was prepared and studied. The phase content and the sample microstructure was examined by an X-ray diffraction method and scanning electron microscopy. EDS measurements were done both for composite samples and the diffusion couple. The electrical properties were studied by four terminal DC method. The Ahigh-temperature interaction between...

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• Experimental investigations and simulations of the microturbine unit with permanent magnet generator

  Publikacja

  • W. Włodarski

  - ENERGY - Rok 2018

  In dispersed power generation, low power devices are used for local combined generating of heat end electric power. There are developing concepts of micropower plants with electric generators driven by steam or gas microturbines. The paper presents the results of an experimental investigations of the microturbine set consists of the turbine with partial admission, permanent magnet generator and three phase AC-to-DC rectifier. The...

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• Synthesis, structure and physical properties of new intermetallic spin glass-like compounds RE2PdGe3 (RE = Tb and Dy)

  Publikacja

  • L. Litzbarski
  • T. Klimczuk
  • M. J. Winiarski

  - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2020

  New intermetallic compounds Tb2Pd1.25Ge2.75 and Dy2Pd1.25Ge2.75 have been synthesized using the arc-melting method. The crystallographic structure and magnetic, electronic transport, and thermal properties are reported. The crystal structure obtained from powder x-ray diffraction analysis suggests that these compounds crystallize in the AlB2-type structure (space group P6/mmm, no. 191) with lattice parameters a  =  4.228 53(5)/4.230 54...

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• Design and Evaluation of the Compact and Autonomous Energy Subsystem of a Wave Energy Converter

  Publikacja

  • M. Drzewiecki
  • J. Guziński

  - ENERGIES - Rok 2023

  This paper presents the results of the design process focused on the development of the energy subsystem (ES) of a wave energy converter (WEC). The ES is an important electrical part that significantly affects the energy reliability and energy efficiency of the entire WEC device. The designed ES was intended for compact WECs powering IoT network devices working in the distributed grid. The developed ES is an electronic circuit...

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• Przegląd i analiza układów napędowych stosowanych w rowerach elektrycznych

  Publikacja

  • D. Adamczyk
  • M. Michna

  - Maszyny Elektryczne : zeszyty problemowe - Rok 2010

  Streszczenie ang. : The purpose of his article is an overview and analysis of the drive system used in electrical bikes. Classical and modern drive system are described. The stress is putted on the electrical motors used in that applications. Structure, control and power supply of most recent design are presented. The analysis applies to hub motor type Clyte 408 used as a bike drive. Authors have decided to build a filed-circuit...

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• IMPACT OF DIRECT CURRENT ON NITRIFYING BIOMASS

  Publikacja

  • D. J. Kruk
  • A. di Biase
  • K. Wiśniewski
  • M. Elektronowicz
  • J. A. Oleszkiewicz

  - Rok 2014

  Effects of short term exposure of nitrifying biomass to direct current were studied. DC was applied to mixed liquor from municipal BNR plant using graphite electrodes in no substrate limiting conditions. Both, ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) populations were affected by the current, however in opposite ways. The AOB population activity was inhibited by applied voltage. Activity decrease was...

• Nonlinear and linear impedance of bismuth vanadate ceramics and its relation to structural properties

  Publikacja

  • N. A. Wójcik
  • P. Kupracz
  • M. Prześniak-Welenc
  • J. Karczewski
  • M. Gazda
  • R. J. Barczyński

  - SOLID STATE IONICS - Rok 2015

  The nonlinear and linear electrical properties, topography, and microstructure of bismuth-vanadate ceramics, were studied. The structurewas observed with the use of X-ray diffraction (XRD), scanning electronmicroscopy (SEM), atomic force microscopy (AFM) and confocal microscopy methods. The obtained results showed that ceramic is porous. Two phase transitionswere determinedwith the use of DSC measurements. The linear and nonlinear ac...

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• Charge-based deep level transient spectroscopy of B-doped and undoped polycrystalline diamond films

  Publikacja

  • K. Paprocki
  • K. Fabisiak
  • R. Bogdanowicz
  • Ł. Gołuński
  • E. Staryga
  • M. Szybowicz
  • M. Kowalska
  • A. Banaszak-Piechowska

  - JOURNAL OF MATERIALS SCIENCE - Rok 2017

  The undoped and B-doped polycrystalline diamond thin film was synthesized by hot filament chemical vapor deposition and microwave plasma, respectively. The structural characterization was performed by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The electrical properties of synthesized diamond layer were characterized by dc-conductivity method and charge deep level transient spectroscopy. The B-doped...

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• Performance of zinc-rich coatings evaluated using AFM-based electrical properties imaging

  Publikacja

  • M. Szociński
  • K. Darowicki

  - PROGRESS IN ORGANIC COATINGS - Rok 2016

  The paper presents the results of investigation of polyvinyl zinc-rich coating exposed to 97% relativehumidity atmosphere for 40 days. Condition of the coating and evolution of its protective properties weredetermined with the novel AFM-based approach capable of providing surface profiles, local dc currentmaps as well as local impedance spectra. The proposed technique allowed insight into the local changesof coating topography...

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• Artificial-Hand Technology—Current State of Knowledge in Designing and Forecasting Changes

  Publikacja

  • J. Szkopek
  • G. Redlarski

  - Applied Sciences-Basel - Rok 2019

  The subject of human-hand versatility has been intensively investigated for many years. Emerging robotic constructions change continuously in order to mimic natural mechanisms as accurately as possible. Such an attitude is motivated by the demand for humanoid robots with sophisticated end effectors and highly biomimic prostheses. This paper provides wide analysis of more than 80 devices that have been created over the last 40 years....

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• Application of Barycentric Coordinates in Space Vector PWM Computations

  Publikacja

  • P. Szczepankowski
  • J. Nieznański

  - IEEE Access - Rok 2019

  This paper proposes the use of barycentric coordinates in the development and implementationof space-vector pulse-width modulation (SVPWM) methods, especially for inverters with deformed space-vector diagrams. The proposed approach is capable of explicit calculation of vector duty cycles, independentof whether they assume ideal positions or are displaced due to the DC-link voltage imbalance. The use ofbarycentric coordinates also...

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• New approaches for improving selectivity and sensitivity of resistive gas sensors: A review

  Publikacja

  • J. Smulko
  • M. Trawka
  • L. Hasse
  • C. G. Granqvist
  • R. Ionescu
  • F. E. Annanouch
  • E. Llobet
  • L. B. Kish

  - Rok 2014

  Resistive gas sensors are very popular and reliable but suffer from low selectivity and sensitivity. Various methods have been suggested to improve both features without increasing the number of sensors in gas detection systems. Fluctuation enhanced gas sensing was proposed to improve gas detection efficiency by analyzing low-frequency resistance fluctuations, and noise parameters can be more informative than the single DC resistance...

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• Dynamiczne wyznaczanie parametrów elektrycznego obwodu szeregowego

  Publikacja

  • R. Arendt

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2015

  Po załączeniu napięcia na skutek istnienia inercji prąd w obwodzie zaczyna narastać od wartości zerowej do znamionowej. W tym czasie narastają spadki napięć na rezystancjach (impedancjach obwodu) do chwili spełnienia prawa Kirchhoffa. Można utworzyć układ ze sprzężeniem zwrotnym (układ regulacji stałowartościowej bądź nadążnej), który poszukuje parametrów obwodu spełniających prawa Kirchhoffa – elementy nie muszą być liniowe. W...

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• Predykcyjne sterowanie równoległym filtrem aktywnym ze sprzężeniem od prądu zasilającego

  Publikacja

  • A. Bielecka
  • D. Wojciechowski

  - Przegląd Elektrotechniczny - Rok 2019

  Artykuł przedstawia nowatorską strategię predykcyjnego sterowania równoległym energetycznym filtrem aktywnym (EFA). Proponowane sterowanie zawiera sprzężenie zwrotne od prądu zasilającego i wiąże zalety sterowania w układzie otwartym oraz zamkniętym – szybkość reakcji na zmianę prądu odbioru i bardzo wysoką skuteczność kompensacji. Wysoka jakość prądu kompensacyjnego wynika również z zastosowania w sterowaniu algorytmów predykcyjnych,...

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• Fire Weather Index data for Poland (March – September 2019) based on high-resolution Weather Research and Forecasting Model

  Dane Badawcze

  open access

  • G. Nykiel
  • M. Figurski

  This dataset contains forecasted FWI indices calculated for the period: March 1 - September 30, 2019, based on the meteorological fields derived from the Weather Research and Forecasting Model (WRF) ver. 4.2.1. For each day FWI data with the forecast range equal 24 and 48 hour were stored in GeoTIFF files. In addition, soil moisture and temperature...

• Detekcja i lokalizacja nieprzewodzenia tranzystorów falownika napięcia na podstawie analizy prądu obciążenia

  Publikacja

  • W. Śleszyński
  • J. Nieznański
  • A. Cichowski
  • A. Wojewódka

  - Measurement Automation Monitoring - Rok 2007

  Przedstawiono nową metodę detekcji i lokalizacji nieprzewodzenia tranzystorów w falownikach napięcia zasilających silniki indukcyjne małej mocy. Metoda bazuje na monitorowaniu wartości dwóch sygnałów dia-gnostycznych. Pierwszy z nich, wskaźnik braku przepływu prądu, wykorzystano w celu detekcji uszkodzeń. Drugi, stosunek wartości średniej prądu do wartości średniej bezwzględnej, zawiera informacje umożliwiające lokalizację uszkodzonych...

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• Minimization of a ship's magnetic signature under external field conditions using a multi-dipole model

  Publikacja

  • M. Wołoszyn
  • J. Tarnawski

  - Scientific Reports - Rok 2024

  The paper addresses the innovative issue of minimizing the ship's magnetic signature under any external field conditions, i.e., for arbitrary values of ambient field modulus and magnetic inclination. Varying values of the external field, depending on the current geographical location, affect only the induced part of ship's magnetization. A practical problem in minimizing the ship signature is separating permanent magnetization...

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• Laboratory Load Model Based on 150 kVA Power Frequency Converter and Simulink Real-Time – Concept, mplementation, Experiments

  Publikacja

  • R. Małkowski
  • B. Kędra

  - Acta Energetica - Rok 2015

  First section of the paper provides technical specification of laboratory load model basing on 150 kVA power frequency converter and Simulink Real-Time platform. Assumptions, as well as control algorithm structure is presented. Theoretical considerations based on criteria which load types may be simulated using discussed laboratory setup, are described. As described model contains transformer with thyristor-controlled tap changer,...

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• Collection Efficiency in Narrow Electrostatic Precipitators with a Longitudinal or Transverse Wire Electrode

  Publikacja

  • A. Niewulis
  • J. Podliński
  • J. Mizeraczyk
  • V. Shapoval

  - IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION - Rok 2011

  Recently narrow electrostatic precipitators (ESPs) have become a subject of interest because of their possible application in diesel engine exhaust systems. In this work, results of particle collection efficiency measurements in narrow electrostatic precipitators for negative and positive dc voltage polarity are presented. The ESP usedin this work was a parallelepiped equipped with wire discharge electrode and two collecting plate-electrodes....

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• Local properties of organic coatings close to glass transition temperature

  Publikacja

  • M. Szociński
  • K. Darowicki

  - PROGRESS IN ORGANIC COATINGS - Rok 2014

  Acrylic coating applied on copper substrate has been investigated at different temperatures starting from the ambient one up to the level above the glass transition temperature. Its local topographic and electric properties have been examined with the atomic force microscopy (AFM) based approach including dc current mapping and local impedance spectroscopy. The local findings have been compared with the information from global...

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• The Influence of a Photovoltaic Micro-Installation on the Low-Frequency Parameters of Electricity at PCC and Its Impact on the Thermal Characteristics of Selected Devices

  Publikacja

  • S. Galla
  • M. Włas

  - ENERGIES - Rok 2021

  This manuscript illustrates the measurement results of parameters describing the quality of energy at the PCC (point of common coupling) of a photovoltaic micro-installation that can significantly affect devices in the same power grid. The analyses reflecting heating of selected devices used in domestic installations, which were performed in an isolated laboratory environment, are also indicated. The conducted study aimed at checking...

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• Pedestrian Safety at Midblock Crossings on Dual Carriageway Roads in Polish Cities

  Publikacja

  • P. Szagała
  • A. Brzeziński
  • M. Kieć
  • M. Budzyński
  • J. Wachnicka
  • S. Pazdan

  - Sustainability - Rok 2022

  Road crossings across two or more lanes in one direction are particularly dangerous due to limited sight distance and high vehicle speeds. To improve their safety, road authorities should provide safety treatments. These may include additional measures to reduce speed and narrow the road cross-section and the introduction of active pedestrian crossings. Equipped with flashing lights activated automatically when a pedestrian is...

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• Damage-Involved Structural Pounding in Bridges under Seismic Excitation

  Publikacja

  • R. Jankowski

  - Key Engineering Materials - Rok 2017

  During severe earthquakes, pounding between adjacent superstructure segments of highway elevated bridges was often observed. It is usually caused by the seismic wave propagation effect and may lead to significant damage. The aim of the present paper is to show the results of the numerical analysis focused on damage-involved pounding between neighbouring decks of an elevated bridge under seismic excitation. The analysis was carried...

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• Rubber wastes recycling for developing advanced polymer composites: A warm handshake with sustainability

  Publikacja

  • P. Wiśniewska
  • N. A. Wójcik
  • J. Ryl
  • R. Bogdanowicz
  • H. Vahabi
  • K. Formela
  • M. Saeb

  - JOURNAL OF CLEANER PRODUCTION - Rok 2023

  Recycling and management of rubber wastes experiences an early-stage maturity in the quest for sustainable and circular materials. Up to now, solutions proposed for sustainable development of rubber wastes are limited, so that properties and performance features of recycled products are inadequate for practical applications. Herein, an experimental protocol is introduced for manufacturing semi-sustainable polymer composites based...

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• Numerical Comparison of Damping Amplification Effects Obtained in Neighborhood of a Mechanism Singular Position - Viscous and Electromagnetic Cases

  Publikacja

  • K. Lipiński

  - Key Engineering Materials - Rok 2014

  In the paper, results of numerical investigations are presented. A continuous beam is considered as the main vibrating element. Two energy dissipations methods are compared: viscous dampers and DC generators. To increase the damping effectiveness, velocity amplification is proposed, i.e., a mechanism is introduced between the beam and the damping element, and the mechanism configuration is set as closed to the singular position...

• Fault Loop Impedance Measurement in Circuits Fed by UPS and Principle of Safety Protection

  Publikacja

  • J. Katarzyński
  • M. Olesz

  - Sustainability - Rok 2020

  This paper indicates a significant problem of uncertainty of fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value of this impedance, related to the short-circuit current disconnection time and to the reference value, is one of the most important elements that determines the approval of an electrical installation and its receivers...

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• Design of Intelligent Low-Voltage Load Switch for Remote Control System in Smart Grid

  Publikacja

  • D. Xiong
  • X. Chen
  • R. Martinek
  • H. Wen
  • D. Luo
  • J. Smulko

  - Iranian Journal of Science and Technology-Transactions of Electrical Engineering - Rok 2021

  Current low-voltage load switches do not support remote disconnect/connect and real-time monitoring of a disconnect/connect state. Addressing to these issues, this paper presents a low-voltage load switch for a smart remote control system, which uses a one-chip microcontroller board and a DC step motor drive mechanism and provides the feedback on the switch status also. Arrears disconnect and full-pay connect control is implemented...

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• Analysis of exhaled breath for dengue disease detection by low-cost electronic nose system

  Publikacja

  • J. Smulko
  • T. Chludziński
  • T. Majchrzak
  • A. Kwiatkowski
  • S. Borys
  • A. Lisset Jaimes-Mogollón
  • C. Manuel Durán-Acevedo
  • O. Geovanny Perez-Ortiz
  • R. Ionescu

  - MEASUREMENT - Rok 2022

  This paper presents a procedure and a set-up of an electronic nose system analyzing exhaled breath to detect the patients suffering from dengue – a mosquito-borne tropical disease. Low-power resistive gas sensors (MiCS-6814, TGS8100) were used to detect volatile organic compounds (VOCs) in the exhaled breath. The end-tidal phase of patients exhaled breath was collected with a BioVOCTM breath sampler. Two strategies were assessed...

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• Metamaterial-Based Sub-Microwave Electromagnetic Field Energy Harvesting System

  Publikacja

  • M. Nowak

  - ENERGIES - Rok 2021

  This paper presents the comprehensive analysis of the sub-microwave, radio frequency band resonant metastructures’ electromagnetic properties with a particular emphasis on the possibility of their application in energy harvesting systems. Selected structures based on representative topologies of metamaterials have been implemented in the simulation environment. The models have been analyzed and their substitute average electromagnetic...

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• Flicker Noise in Resistive Gas Sensors—Measurement Setups and Applications for Enhanced Gas Sensing

  Publikacja

  • J. Smulko
  • G. Scandurra
  • K. Drozdowska
  • A. Kwiatkowski
  • C. Ciofi
  • H. Wen

  - SENSORS - Rok 2024

  We discuss the implementation challenges of gas sensing systems based on low-frequency noise measurements on chemoresistive sensors. Resistance fluctuations in various gas sensing materials, in a frequency range typically up to a few kHz, can enhance gas sensing by considering its intensity and the slope of power spectral density. The issues of low-frequency noise measurements in resistive gas sensors, specifically in two-dimensional...

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• Sensing the onset of epoxy coating degradation with combined Raman spectroscopy/atomic force microscopy/electrochemical impedance spectroscopy

  Publikacja

  • M. Szociński
  • K. Darowicki

  - PROGRESS IN ORGANIC COATINGS - Rok 2023

  The paper presents the results of investigation on epoxy resin durability upon 12-week exposure to UV radiation. The aim was early determination of the onset of epoxy degradation and for this purpose an epoxy film on steel substrate systems were periodically inspected using Raman spectroscopy, atomic force microscopy and electrochemical impedance spectroscopy. The behaviour of examined polymer could be divided into three periods: immunity,...

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• Multiple output CMOS current amplifier

  Publikacja

  • B. Pankiewicz

  - Bulletin of the Polish Academy of Sciences-Technical Sciences - Rok 2016

  In this paper the multiple output current amplifier basic cell is proposed. The triple output current mirror and current follower circuit are described in detail. The cell consists of a split nMOS differential pair and accompanying biasing current sources. It is suitable for low voltage operation and exhibits highly linear DC response. Through cell devices scaling, not only unity, but also any current gains are achievable. As...

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• Properties of LiMnBO3 glasses and nanostructured glass-ceramics

  Publikacja

  • P. Michalski
  • A. Gołębiewska
  • J. Trebosc
  • O. Lafon
  • T. Pietrzak
  • J. Ryl
  • J. Nowiński
  • M. Wasiucionek
  • J. Garbarczyk

  - SOLID STATE IONICS - Rok 2019

  Polycrystalline LiMnBO3 is a promising cathode material for Li-ion batteries. In this work, we investigated the thermal, structural and electrical properties of glassy and nanocrystallized materials having the same chemical composition. The original glass was obtained via a standard melt-quenching method. SEM and 7Li solid-state NMR indicate that it contains a mixture of two distinct glassy phases. The results suggest that the...

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• AFM-assisted investigation of conformal coatings in electronics

  Publikacja

  • M. Szociński

  - ANTI-CORROSION METHODS AND MATERIALS - Rok 2016

  Purpose – This paper aims to presents a new method of investigation of local properties of conformal coatings utilized in microelectronics. Design/methodology/approach – It is based on atomic force microscopy (AFM) technique supplemented with the ability of local electrical measurements, which apart from topography acquisition allows recording of local impedance spectra, impedance imaging and dc current mapping. Potentialities...

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• Hebb–Wagner polarization method for determining the oxygen ion conductivity in barium cerate-zirconate

  Publikacja

  • T. Miruszewski
  • K. Dzierzgowski
  • P. Winiarz
  • S. L. Wachowski
  • A. D. Mielewczyk-Gryń
  • M. Gazda

  - Journal of Materials Chemistry A - Rok 2022

  In this work, the partial conductivity of oxygen ions in BaCe0.6Zr0.2Y0.2O3 was studied at different temperatures and water partial pressures. For this purpose, a modified DC Hebb–Wagner polarization method with an electrode blocking for protons and electrons was used. A new type of measuring cell as well as a suitable calculation model were proposed for the determination of partial oxygen ionic conductivity in materials with three...

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• STANY NIEUSTALONE TOWARZYSZĄCE POMIAROWI IMPEDANCJI PĘTLI ZWARCIA W OBWODACH WYJŚCIOWYCH ZASILACZY BEZPRZERWOWYCH UPS

  Publikacja

  • M. Olesz
  • J. Katarzyński

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2018

  W pracy przedstawiono metodykę i wyniki pomiarów stanów nieustalonych w zasilaczu bezprzerwowym (UPS) typu on - line. Do rejestracji zdarzeń po stronie zasilania i na wyjściu UPS wykorzystano dwa przyrządy do pomiaru jakości energii elektrycznej zsynchronizowane czasowo. Rejestratory kompresują uzyskane dane pomiarowe, co może wprowadzać dodatkowe błędy pomiaru wielkości mierzonych – napięć i prądów. Dodatkowe rejestracje oscyloskopem...

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• Highly stable CsFAPbIBr perovskite solar cells with dominant bulk recombination at real operating temperatures

  Publikacja

  • B. Romero
  • S. Delgado
  • D. Głowienka
  • C. Chang
  • G. Del Pozo
  • B. Arredondo
  • D. Martín-Martín
  • P. Contreras
  • Y. Galagan

  - Sustainable Energy & Fuels - Rok 2023

  Mixed-cation mixed-halide perovskite solar cells have been characterized in DC at different temperatures (from −20 °C up to 50 °C) and the time evolution of the device efficiency has been assessed using different degradation protocols (indoors and outdoors). The completely planar p–i–n structure is ITO/CuNiOx/PTAA/CsFAPbIBr/PCBM/PEI/Ag. Pristine current–voltage characteristics barely show hysteresis, at any temperature. Open circuit...

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• Nanostructure and dielectric behavior of vanadate glasses containing BaTiO3

  Publikacja

  • N. A. Wójcik
  • P. Kosiorek
  • K. Kasiak
  • J. Karczewski
  • M. Gazda
  • R. J. Barczyński

  - JOURNAL OF NON-CRYSTALLINE SOLIDS - Rok 2014

  The ac and dc electrical conductivity of barium titanate doped bismuth-vanadate as-quenched and heat-treated materials was measured in the frequency range from 1 mHz to 1 MHz and in the temperature range from 153 K to 423 K with the impedance spectroscopy method. The microstructure was investigated by means of XRD, scanning electron microscopy (SEM), atomic force microscopy (AFM) and confocal microscopy. The obtained results showed...

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• Low-frequency noise in Au-decorated graphene–Si Schottky barrier diode at selected ambient gases

  Publikacja

  • J. Smulko
  • K. Drozdowska
  • A. Rehman
  • T. Welearegay
  • L. Österlund
  • S. Rumyantsev
  • G. Cywiński
  • B. Stonio
  • A. Krajewska
  • M. Filipiak
  • P. Sai

  - APPLIED PHYSICS LETTERS - Rok 2023

  We report results of the current–voltage characteristics and low-frequency noise in Au nanoparticle (AuNP)-decorated graphene–Si Schottky barrier diodes. Measurements were conducted in ambient air with addition of either of two organic vapors, tetrahydrofuran [(CH2)4O; THF] and chloroform (CHCl3), as also during yellow light illumination (592nm), close to the measured particle plasmon polariton frequency of the Au nanoparticle...

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• Ionic conductivity behavior by activated hopping conductivity (AHC) of barium aluminoborosilicate glass–ceramic system designed for SOFC sealing

  Publikacja

  • M. Da
  • W. Pontuschka
  • J. Bartolomé
  • P. Jasiński
  • J. Karczewski
  • S. Reis

  - JOURNAL OF THE EUROPEAN CERAMIC SOCIETY - Rok 2019

  Non-conducting BaO-B2O3-Al2O3-SiO2 parent glasses designed for solid oxide fuel cell (SOFC) sealing applications were prepared using the melt-quenching technique. The glass formation region was determined according to phase equilibrium relations and was found to be in the composition range 70BaO-(x)Al2O3-(10−x)B2O3-20SiO2 where 3.0 < x < 6.0 wt%. The conductivity values obtained conductivity ranged from 10−5 to 10−10 S/cm at temperatures...

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• Electrical properties of Na2O-CaO-P2O5 glasses doped with SiO2 and Si3N4

  Publikacja

  • N. A. Wójcik
  • B. Jonson
  • R. J. Barczyński
  • P. Kupracz
  • D. Möncke
  • S. Ali

  - SOLID STATE IONICS - Rok 2018

  Sodium-calcium-phosphate glasses doped with SiO2 or Si3N4 having similar sodium ion concentrations were prepared by melt quenching. The conductivity was measured by impedance spectroscopy under nitrogen atmosphere in a wide frequency range (10 mHz–1 MHz) and wide temperature range (153–473 K). At 36.6 °C, DC conductivities of all glasses vary between 1.1 ∗ 10−12 and 8.9 ∗ 10−12 S cm−1 and have similar activation energies (between...

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• Portable exhaled breath analyzer employing fluctuation-enhanced gas sensing method in resistive gas sensors

  Publikacja

  • A. Kwiatkowski
  • T. Chludziński
  • J. Smulko

  - Metrology and Measurement Systems - Rok 2018

  This paper presents a portable exhaled breath analyser, developed to detect selected diseases. The set-up employs resistive gas sensors: commercial MEMS sensors and prototype gas sensors made of WO3 gas sensing layers doped with various metal ingredients. The set-up can modulate the gas sensors by applying UV light to induce physical changes of the gas sensing layers. The sensors are placed in a tiny gas chamber of a volume...

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• Superconductivity in CaBi2

  Publikacja

  • M. J. Winiarski
  • B. Wiendlocha
  • S. Gołąb
  • S. K. Kushwaha
  • P. Wiśniewski
  • D. Kaczorowski
  • J. D. Thompson
  • R. J. Cava
  • T. Klimczuk

  - PHYSICAL CHEMISTRY CHEMICAL PHYSICS - Rok 2016

  Superconductivity is observed with critical temperature Tc = 2.0 K in self-flux-grown single crystals of CaBi2. This material adopts the ZrSi2 structure type with lattice parameters a = 4.696(1) Å, b = 17.081(2) Å and c = 4.611(1) Å. The crystals of CaBi2 were studied by means of magnetic susceptibility, specific heat and electrical resistivity measurements. The heat capacity jump at Tc is DC/gTc = 1.41, confirming bulk superconductivity;...

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• Advanced operating methods

  Publikacja

  • J. Smulko

  - Rok 2020

  Selected operating methods of resistive gas sensors were presented. The methods utilize flicker noise (1/f noise), which gives additional information about ambient gas when compared with the recorded changes of DC resistance only. Methods of flicker noise measurements were outlined. Recently developed prototype gas sensors comprising golden nanoparticle functionalized with organic ligands can generate intense flicker noise induced...

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• Falowniki napięcia z quasi-rezonansowym obwodem pośredniczącym w układach napędowych

  Publikacja

  • M. Turzyński

  - Rok 2020

  W monografii przedstawiono zagadnienia związane z wykorzystaniem pośrednich przemienników częstotliwości z rezonansowymi oraz quasi-rezonansowymi obwodami pośredniczącymi w układach napędowych. Omówiono wpływ przełączania „twardego” przy niezerowych prądach i napięciach łączników na właściwości eksploatacyjne elektrycznego układu napędowego. Ponadto dokonano przeglądu wybranych topologii przekształtników DC/AC, zapewniających techniki...

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