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Wyniki wyszukiwania dla: DOUBLY-FED GENERATOR
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A white phosphor based on oxyfluoride nano-glass-ceramics co-doped with Eu3+ and Tb3+: Energy transfer study
PublikacjaStrontium fluoride nanocrystals doped separately with Ln3+ = Eu3+ or Tb3+ ions (95SrF2·5LnF2), as well as co-doped with both the ions (95SrF2·Eu4Tb) were synthesized for comparison. Then, glass-ceramics consisting of the mono-doped or di-doped SrF2 nanocrystals incorporated into amorphous silica (90SiO2·9.5SrF2·0.5Ln or 90SiO2·9.5SrF2·0.1EuF3·0.4Tb) were prepared by sol-gel procedure. The studied materials were characterized by...
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Simulation of signal acquisition from a rotary flowmeter
Dane BadawczeThe dataset contains results of simulation measuring the flow of homogeneous substances by rotational flow meter: a moment of impulse at the output of flow meter, time between successive pulses, number of pulses counted from standard generator and relative error of measurement.
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Transient States during Short-circuit in a Line Powered by UPS and its Impact on Earth Fault Loop Impedance Measurement and Power Quality
PublikacjaThe short-circuit in a line powered by Uninterruptible Power Supply (UPS) during different UPS operation modes is presented in the article. The transient state condition related to the short-circuit in a line fed from double conversion On-line UPS is discussed in detail. The results of the measurements of earth fault loop impedance (FLI) in circuits powered by UPS with the instruments of various manufacturers are presented. The...
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Design and experimental verification of multi-layer waveguide using pin/hole structure
PublikacjaThis study presents a novel technique for minimizing RF leakage in metallic hollow waveguides fabricated using the multilayer split-block method. By integrating a pin/hole wall into the split-block multilayers, a substantial reduction of RF leakage can be achieved while reducing the circuit size and mitigating the performance variations. To validate the proposed approach, a slot antenna fed by single ridge waveguide has been prototyped...
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Generator energii z fal morskich i oceanicznych
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Sensorless Disturbance Detection for Five Phase Induction Motor with Third Harmonic Injection
PublikacjaThe paper presents a sensorless disturbance detection procedure that was done on a five phase induction motor with third harmonic injection. A test bench was developed where a three phase machine serves as disturbance generator of different frequencies. The control of the machines is based on multi scalar variables that ensures an independent control of the motor EMF and the rotor flux. For disturbance identification a speed observer...
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Stanowisko do diagnostyki zabezpieczeń różnicowoprądowych
PublikacjaW pracy przedstawiono stanowisko laboratoryjne, które umożliwia badanie zabezpieczeń różnicowoprądowych przy wybranych przebiegach prądu różnicowego przewidzianych przez normy przedmiotowe oraz przy różnych przebiegach prądu różnicowego spotykanych w praktyce, a nie przewidzianych przez normy przedmiotowe. Stanowisko umożliwia generowanie ustalonych prądów różnicowych oraz różnego typu prądów przejściowych. Zasadniczym elementem...
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Zrobotyzowany system docierania powierzchni płaskich z zastosowaniem plików CL Data
PublikacjaObecnie wymagania stawiane częściom maszyn są coraz większe. Jedną z najczęściej stosowanych obróbek precyzyjnych jest docieranie. Docieranie powierzchni płaskich odbywa się na docierarkach z układem pierścieniowym. Symulacje komputerowe wykazały, że zmiana kinematyki docierania ma istotny wpływ na zużycie narzędzia. Opracowano koncepcję zestawienia robota i docierarki jednotarczowej, która umożliwia wprowadzenie dodatkowego ruchu...
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SSFR Test of Synchronous Machine for Different Saturation Levels using Finite-Element Method
PublikacjaIn this paper the StandStill Frequency Response characteristics (SSFR) of saturated synchronous generator (SG) have been calculated using Finite Element Method (FEM) analysis. In order to validate proposed approach for unsaturated conditions FEM simulation from Flux2D software has been compared with the measurements performed on the 10 kVA, 4- poles synchronous machine ELMOR GCe64a of salient rotor construction, equipped with a...
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50’ Sail Catamaran with Hybrid Propulsion, Design, Theoretical and Experimental Studies
PublikacjaThe development of modern lithium batteries and propulsion systems now allows the use of complex propulsion systems for vessels of various sizes. As part of the research and implementation project, a parallel hybrid drive system was designed, built and then tested in the laboratory. The experimental studies conducted allowed for the measurements of power, fuel consumption and electric power distribution in various operating modes...
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Software Agents for Computer Network Security
PublikacjaThe chapter presents applications of multi-agent technology for design and implementation of agent-based systems intended to cooperatively solve several critical tasks in the area of computer network security. These systems are Agent-based Generator of Computer Attacks (AGCA), Multi-agent Intrusion Detection and Protection System (MIDPS), Agent-based Environment for Simulation of DDoS Attacks and Defense (AESAD) and Mobile Agent...
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The voltage on bus bars of the main switchboard of the ferry electrical power system during a layover at the port
Dane BadawczeThe dataset is part of the research results on the quality of supply voltage on bus bars of the main switchboard of the ship's electrical power system in different states of ship exploitation. The attached dataset contains the measurement results carried out onboard the ferry during a layover at the port.
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A mechanistic model for fate and removal of estrogens in biological nutrient removal activated sludge systems
PublikacjaTwo estrogen fate and transformation models were integrated with a comprehensive activated sludge model (ASM) to predict estrogen removal based on biomass and solids production. Model predictions were evaluated against published full-scale plant data as well as results from a laboratory-scale sequencing batch reactor (SBR) fed synthetic wastewater. The estrogen fate model relating the rate of total estrogen degradation to soluble...
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Guanosine Dianions Hydrated by One to Four Water Molecules
PublikacjaIntermolecular interactions such as those present in molecule···water complexes may profoundly influence the physicochemical properties of molecules. Here, we carried out an experimental–computational study on doubly deprotonated guanosine monophosphate···water clusters, [dGMP – 2H]2–·nH2O (n = 1–4), using a combination of negative anion photoelectron spectroscopy (NIPES) with molecular dynamics (MD) and quantum chemical (QM) calculations....
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Sterowanie poziomami napięć i rozpływem mocy biernej w lokalnych elektrowniach z generatorami synchronicznymi.
PublikacjaW krajowym systemie elektoenergetycznym możliwości regulacyjne lokalnych elektrowni w zakresie sterowania poziomami napięć i rozpływem mocy biernej dotychczas wykorzystywane są mało. Przyczyną jest brak odpowiednich systemów rozliczeń i nieprzystosowanie układów regulacyjnych. Opisano możliwe cele takiej regulacji oraz zaprezentowano niektóre sposoby potrzebnego rozwoju układów regulacyjnych elektrowni lokalnych. W szczególności...
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Technisch-wirtschaftliche Analyse verschiedener Moglichkeiten zur Energie versorgung einer historischen Stadtvilla.
PublikacjaW pracy rozważono kilka wybranych wariantów systemów grzewczych i grzewczo-elektrycznych możliwych do zainstalowania w willi o znaczeniu historycznym. Przedstawiono wyniki analizy technicznej i ekonomicznej systemów opartych na: klasycznym kotle wodnym opalanym gazem ziemnym, module termomechanicznym(silnik spalinowy+generator energii elektrycznej), pompie ciepła napędzanej silnikiem spalinowym na gaz ziemny, ogniwie paliwowym....
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Monitoring the gas turbine start-up phase on the platform using a hierarchical model based on Multi-Layer Perceptron networks
PublikacjaVery often, the operation of diagnostic systems is related to the evaluation of process functionality, where the diagnostics is carried out using reference models prepared on the basis of the process description in the nominal state. The main goal of the work is to develop a hierarchical gas turbine reference model for the estimation of start-up parameters based on multi-layer perceptron neural networks. A functional decomposition...
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Augmented speed control scheme of dual induction motors with mutual flux angle control loop
PublikacjaThis paper proposes an augmented speed control scheme of dual induction motors fed by a five-leg voltage source inverter (VSI) with a common/shared-leg. An additional control loop is proposed here and based on the mutual flux angle – the difference between flux angular positions of the IMs. The main purpose of this research is to minimize the energy losses in the common inverter leg by controlling the mutual flux angle, at equal...
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Excitation of Circularly Polarized Wave via Single-Feed Metasurface-Integrated Compact Antenna for Internet of Things
PublikacjaA compact circularly polarized (CP) quasi-omnidirectional antenna is introduced for internet of things (IoT). The structure consists of two components implemented on FR-4 substrates, and sep-arated by an air gap: one printed with a rectangular patch fed through a matching network, and another with a metasurface and a ground plane. Two different methods for impedance matching are employed. An equivalent circuit model of the antenna...
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Przykłady zastosowań
PublikacjaW rozdziale przedstawiono przykładowy sposób analizy funkcji systemów sterowania i zabezpieczeń w odniesieniu do turbozespołu o strukturze typu: kocioł-turbina-generator. Ryzyko związane z eksploatacją turbozespołu zależy od różnych czynników i rozwiązań technicznych, organizacyjnych oraz od zastosowanych podsystemów sterowania, zabezpieczeń oraz systemów E/E/PE związanych z bezpieczeństwem. Jednym z elementów takiego podsystemu...
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Local dynamics of fluids and dielectrics as the foundation of signal-carrying wave properties
PublikacjaThis paper develops an original approach to fundamental problems of classical linear acoustics and electromagnetics, proving a crucial role of doubly-dynamic local properties of a propagation medium in supporting wave-like fields able to carry information signals. The proof is composed of two steps concerning, subsequently, fluid acoustics and dielectric electromagnetics. The first step consists in complementing a common, practically...
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Detection of the acoustic interferences during AFM operation
Dane BadawczeAtomic force microscopy is a particularly complicated surface imaging technique due to the large number of factors that affect the quality of the resulting images. They are obviously difficult and sometimes even impossible to control at the same time. One of such factors may even be the seismological location of the building or the influence of mechanical...
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Examining Influence of Distance to Microphone on Accuracy of Speech Recognition
PublikacjaThe problem of controlling a machine by the distant-talking speaker without a necessity of handheld or body-worn equipment usage is considered. A laboratory setup is introduced for examination of performance of the developed automatic speech recognition system fed by direct and by distant speech acquired by microphones placed at three different distances from the speaker (0.5 m to 1.5 m). For feature extraction from the voice signal...
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Nitrogen removal via the nitrite pathway during wastewater co-treatment with ammonia-rich landfill leachates in a sequencing batch reactor
PublikacjaThe biological treatment of ammonia-rich landfill leachates due to an inadequate C to N ratio requires expensive supplementation of carbon from an external carbon source. In an effort to reduce treatment costs, the objective of the study was to determine the feasibility of nitrogen removal via the nitrite pathway during landfill leachate co-treatment with municipal wastewater. Initially, the laboratory-scale sequencing batch reactor...
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Właściwości uzwojeń koncentrycznych ułamkowo-żłobkowych w aspekcie jakości napięcia generatorów synchronicznych
PublikacjaW artykule przedstawiono wyniki analizy właściwości uzwojeń koncentrycznych ułamkowo żłobkowych. Porównano wartość współczynnika uzwojenia dla podstawowej harmonicznej oraz zawartość wyższych harmonicznych. Obliczenia wykonano w oparciu o zależności analityczne zaimplementowane w specjalnie przygotowanym programie komputerowym. W celu weryfikacji wyników przygotowano model numeryczny maszyny bezszczotkowej maszyny prądu przemiennego...
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The voltage on bus bars of the main switchboard of the ro-ro ship electrical power system during maneuvering
Dane BadawczeThe dataset is part of the research results on the quality of supply voltage on bus bars of the main switchboard of the ship's electrical power system in different states of ship exploitation. The attached dataset contains the measurement results carried out onboard a ro-ro ship during maneuvering.
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AC-DC-DC Converter for Small Power Energy Storage Systems
PublikacjaThe energy transformation driven by the development of renewable energy sources has become a reality for all power grid users. Prosumer energy, primarily utilizing photovoltaic installations, is one of the fastest-growing market segments. The advancement of technology, a decrease in electrochemical energy storage prices, and changes in the legal framework governing energy billing for grid-fed power have led to a growing interest...
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Public Finance in Poland in a COVID Fog: A Look Through the Lens of Fiscal Transparency and Accountability
PublikacjaAbstract. Goal– The aim of the article is to identify dysfunctional phenomena (implementation of specific mechanisms/solutions and actions taken), generating increased opacity and limit the responsibility/accountability of public f inance in Poland, exacerbated by the COVID-19 crisis. Methods– descriptive analysis, comparative analysis and financial analysis methods were used. Results– fiscal transparency and accountability in...
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BLDFIG Projekt i realizacja budowy wysokosprawnościowej turbiny wiatrowej w oparciu o wolnoobrotowy bezprzekładniowy, wielofazowy dwustronnie zasilany generator indukcyjny
ProjektyProjekt realizowany w Katedra Energoelektroniki i Maszyn Elektrycznych zgodnie z porozumieniem LIDER13/0153/2022 z dnia 2023-03-24
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Analytical and reliability data from the real-time simulator biogas plant
Dane BadawczeThe dataset represents the results of biogas plant simulation. The described plant is an agricultural biogas system, which can produce electrical energy with power estimated up to 1070 kW and heat energy that can reach 1200 kW simultaneously.
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Piezo 2011, Electroceramics for End-Users VI
PublikacjaThis work extends a power harvesting with using piezoelectric materials. Experimental presents the development of a piezoelectric MEMS generator which has the ability to scavenge mechanical energy of ambient vibrations from their surroundings and transform it into electrical energy that can be used in energy storage applications. Recent literature shows that piezoelectric transduction has received the most attention for vibration-to-electricity...
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Sound Field Intensity Measurements and Visualization around the Human Head Model . Rozkłąd natężenia pola akustycznego w komorze bezechowej obecności sztucznej głowy i w przypadku braku jej obecności
PublikacjaThe main goal of this research study was to measure and visualize sound field intensity distribution in and without presence of the human head model. Measurements were performed in the anechoic chamber with the 5 cm grid. Experimental setup consisted of a multitone generator, two loudspeakers, human head model, intensimetric probe, the Cartesian robot applied for precise positioning of the acoustic sensor, and an analyzer. Based...
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Biotrickling filtration of air polluted with hexane and cyclohexane: effects of trickling liquid modification with DES solutions
Dane BadawczeDataset presents selected parameters monitored during processes of biotrickling filtration of air polluted with hexane and cyclohexane.
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Analysis of Measurement Errors in Rail Vehicles’ Pantograph Inspection System
PublikacjaThe paper presents an approach to evaluation of height measurement errors in laser scanning inspection system. The system, consisting of a laser line generator and a specialized camera, is dedicated to diagnosing carbon contact strips of railway vehicles’ pantographs. While height measurement resolution is easily computable based on system parameters, determining the measurement error is troublesome due to numerous impacts. As...
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Pitch shifter with complex instantaneous frequency rescaling and direct digital synthesis
PublikacjaW artykule zaprezentowano nowy przesuwnik wysokości dźwięku ze skalowaniem częstotliwości chwilowej i z syntezą bezpośrednią. Jest on przeznaczony do komponowania melodii np. w telefonie komórkowym. Implementacja przesuwnika jest oparta na twierdzeniu Bedrosiana, zastosowanego do zespolonego odpowiednika hilbertowskiego przetwarzanego sygnału rzeczywistego. Filtr Hilberta pełni tu też dodatkową rolę. Jest nią filtracja antyaliasingowa....
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Problemy dostosowana układu sterowania maszyną dwustronnie zasilaną do nowych wymagań.
PublikacjaW artykule zaprezentowano problemy związane z dostosowaniem układu sterowania maszyną dwustronnie zasilaną pracującą jako generator w elektrowni wiatrowej do nowych wymagań i przepisów stawianych przez operatorów sieci energetycznych. Poruszono problem utrzymania elektrowni wiatrowej w systemie w momencie krótkotrwałego obniżenia lub uskoku napięcia sieci energetycznej spowodowanego odległym zwarciem w systemie lub podłączeniem...
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Controlling computer by lip gestures employing neural network
PublikacjaResults of experiments regarding lip gesture recognition with an artificial neural network are discussed. The neural network module forms the core element of a multimodal human-computer interface called LipMouse. This solution allows a user to work on a computer using lip movements and gestures. A user face is detected in a video stream from a standard web camera using a cascade of boosted classifiers working with Haar-like features....
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Influence of landfill leachate on municipal wastewater treatment - model plant(WWTP-MP)
PublikacjaAbstract In the current study, wastewater treatment model plant (WWTP-MP) was used to investigate the possibilities of landfill leachate co-treatment together with municipal wastewater. The WWT-MP, designed as an A2O multiphase system, was fed with the raw municipal wastewater (from the WWTP Gdańsk "Wschód'', Qav.=82x103 m3/d) with increasing, from 1 to 5 % (vol.), quantity of landfill leachate (collected from Gdańsk landfill ''Szadółki")....
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Simulation-Based Design of Microstrip Linear Antenna Arrays Using Fast Radiation Response Surrogates
PublikacjaFast yet accurate technique for simulation-based design of linear arrays of microstrip patch antennas is presented. Our technique includes: (i) optimization of the corrected array factor of the antenna array under design for a phase excitation taper resulting in reduced side lobes; (ii) simulation-driven optimization of the array element for element dimensions resulting in matching at and about operational frequency, and (iii)...
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Cząsteczki mikroRNA - nowy biologicznie aktywny składnik mleka kobiecego
PublikacjaCząsteczki mikroRNA są krótkimi, niekodującymi oligonukleotydami odpowiadającymi za potranskrypcyjną regulację ekspresji genów. W wyniku ich aktywności kontrolowanych jest wiele procesów komórkowych oraz szlaków sygnalizacyjnych. Od 2010 roku wiadomo, że wchodzą one w skład mleka kobiecego, które obecnie uznaje się za jedno z najbogatszych pokarmowych źródeł mikroRNA. Funkcje tych cząsteczek w organizmie karmionego mlekiem matki...
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Zaawansowany układ samoczynnego załączania rezerwy oparty na sterowniku WAGO PFC200
PublikacjaArtykuł opisuje projekt i wykonanie układu samoczynnego załączania rezerwy (SZR) na potrzeby stacji elektroenergetycznej Laboratorium LINTE^2 na Politechnice Gdańskiej. Układ SZR został zbudowany na podstawie modułowego sterownika PLC WAGO PFC200. W artykule omówiono zasadę działania układu, a także jego program sterowania i aplikację panelu HMI, opracowane w zintegrowanym środowisku programistycznym CoDeSys 3.5. Oprócz zadań typowego...
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Exhaust gas temperature measurements in diagnostic examination of naval gas turbine engines. Part I: Steady-state processes
PublikacjaThe article presents a possible method of detecting failures in the flow section and supply system of a naval gas turbine engine based on the exhaust gas temperature measured behind the gas generator. This temperature is a basic diagnostic parameter use for evaluating the technical state of the turbine engine in operation, and is monitored during engine start-ups, accelerations and decelerations of rotor units, and steady-load...
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Quantum security and theory of decoherence
PublikacjaWe sketch a relation between two crucial, yet independent, fields in quantum information research, viz. quantum decoherence and quantum cryptography. We investigate here how the standard cryptographic assumption of shielded laboratory, stating that data generated by a secure quantum device remain private unless explicitly published, is disturbed by the einselection mechanism of quantum Darwinism explaining the measurement process...
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Efficient FPGA Implementation of an RFIR Filter Using the APC–OMS Technique with WTM for High-Throughput Signal Processing
PublikacjaNowadays, Finite Impulse Response (FIR) filters are used to change the attributes of a signal in the time or frequency domain. Among FIR filters, a reconfigurable filter has the advantage of changing the coefficient in real-time, while performing the operation. In this paper, the Anti-Symmetric Product Coding (APC) and Odd Multiple Storage (OMS) modules are utilized to implement the reconfigurable FIR filter (RFIR–APC–OMS). Herein,...
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Power augmentation of PGE Gorzow's gas turbine by steam injection - thermodynamic overview
PublikacjaThe impact of steam injection upon a gas turbine and a combined power plant performance has been investigated. This article describes and summarizes possibilities of modification for current gas turbine in PGE Gorzow power plant into the Cheng cycle. Our modification deals with a thermal cycle, in which steam produced in a heat recovery steam generator is injected into the gas turbine's combustion chamber. It has been proved that...
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Measurements of passive components using of an IEEE 1149.4 mixed-signal test bus
PublikacjaW pracy przedstawiono wyniki badań nad wykorzystaniem magistrali testującej mieszanej sygnałowo IEEE 1149.4 do pomiarów elementów pasywnych zamontowanych na pakietach elektronicznych. Do badań użyto wyposażonych w magistralę układów scalonych typu STA400. Zaprezentowano metody pomiaru rezystancji pojedynczych elementów z wykorzystaniem źródła prądowego oraz źródła VH znajdującego się w analogowych modułach ABM układu STA400. Pokazano...
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Investigation of praseodymium and samarium co-doped ceria as an anode catalyst for DIR-SOFC fueled by biogas
PublikacjaThe Pr and Sm co-doped ceria (with up to 20 mol.% of dopants) compounds were examined as catalytic layers on the surface of SOFC anode directly fed by biogas to increase a lifetime and the efficiency of commercially available DIR-SOFC without the usage of an external reformer. The XRD, SEM and EDX methods were used to investigate the structural properties and the composition of fabricated materials. Furthermore, the electrical...
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Compact Dual-Polarized Corrugated Horn Antenna for Satellite Communications
PublikacjaIn this paper, a structure and design procedure of a novel compact dual-polarized corrugated horn antenna with high gain and a stable phase center for satellite communication is presented. The antenna incorporates an Ortho-Mode Transducer (OMT), a mode converter, and a corrugated structure. The compact OMT section is designed to be fed by standard WR-75 waveguides. The proposed compact design utilizes only ten corrugated slots...
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Variable Speed AC Drives with Inverter Output Filters
PublikacjaThe advance of variable speed drives systems (VSDs) engineering highlights the need of specific technical guidance provision by electrical machines and drives manufacturers, so that such applications can be properly designed to present advantages in terms of both energy efficiency and expenditure. This book presents problems and solutions related to inverter-fed electrical motors. Practically orientated, the book describes the...
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Appendix E
PublikacjaThe advance of variable speed drives systems (VSDs) engineering highlights the need of specific technical guidance provision by electrical machines and drives manufacturers, so that such applications can be properly designed to present advantages in terms of both energy efficiency and expenditure. This book presents problems and solutions related to inverter-fed electrical motors. Practically orientated, the book describes the...