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Search results for: electric field maps
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Influence of vision measurement system spatial configuration on measurement uncertainty, based on the example of electric traction application
PublicationTechnical diagnostics plays a significant role in ensuring operational reliability of electrified rail transport. The most critical point in the transmission of electric energy to vehicles is the sliding contact of the current collector with the traction network. For this reason, work is currently being carried on new measuring methods, whose appliance allows for more complete diagnostics of the contact line and current collectors,...
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A new time-frequency detection method of stray current field interferenceon metal structures.
PublicationA new detection method has been presented of stray current field interference on underground metal structures. The method employs short time Fourier transformation (STFT). This method of analysis allows determination of signal spectral power density changes (e.g., structure potential) in the function of time. In the paper results have been presented of total time–frequency analysis of a pipeline potential in a stray current field...
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Electric shock hazard in circuits with variable-speed drives
PublicationThe conventional approach to electrical safety under fault condition in typical power systems considers earth fault currents of sinusoidal waveform and frequency of 50/60 Hz. However, in circuits with variable-speed drives, there is earth fault current flow with harmonics, and these harmonics influence the threshold of ventricular fibrillation. The paper presents earth fault current waveforms in circuits with variable-speed drives...
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Selection of the Electric Drive for the Wood Waste Compacting Unit
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Hybrid excited electric machine with axial flux bridges
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Modeling and Simulation of Electric Motors Using Lightweight Materials
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Electric chips for rapid detection and quantification of nucleic acids
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Gene-based identification of bacterial colonies with an electric chip
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Wind Turbine Operation in Electric Power System.Advanced Modelling
PublicationW monografii przedstawiono zagadnienia związane z pracą elektrowni wiatrowych w systemie elektroenergetycznym, a w tym przedstawiono wpływ elektrowni wiatrowych na system elektroenergetyczny (jakość energii elektrycznej). Omówiono zasady modelowania elektrowni wiatrowych różnych typów, tj. z generatorami asynchronicznymi i synchronicznymi, pracujących w systemie elektroenergetycznym. Przestawiono wybrane modele elektrowni wiatrowych...
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IPMSM Control for Electric Vehicle with Separate Wheel Drives.
PublicationPrzedstawiono propozycję hierarchicznej struktury rozproszonej sterowania pojazdu z niezależnym elektrycznym napędem kół. Zaproponowano algorytmy sterowania silnikiem synchronicznym z magnesami trwałymi. Przedstawiono strukturę stanowiska badawczego oraz wstępne wyniki badań symulacyjnych i laboratoryjnych układu.
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Control of Sensorless Electric Drive with Inverter Output Filter
PublicationW artykule przedstawiono układ sterowanie silnikiem asynchronicznym pracyjący bez pomiaru prędkości obrotowej. Zastosowano nowy rodzaj obserwatora prędkości obrotowej będący połączeniem liniowego obserwatora oraz obserwatora zakłóceń. Jako zakłócenia potraktowano siłę elektromotoryczną indukowaną w silniku. Aby umożliwić poprawną pracę układu z filtrem wyjściowym falownika zastosowano symulator dynamiki filtru do wyznaczenia prądów...
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Blackout initial disturbances in electric Power System searching
PublicationThe paper contains short survey of the blackouts that took place in the last few years. The sources and initial disturbances are discussed. The typical scenario of the disturbance, leading to blackout in the electrical power system are presented.Next, models of a power system eligible to considered topic are discussed. Finally the algorithm of the blackout initial disturbances in power system searching is presented.The consideration...
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State observers for diagnostic applications in modern electric traction
PublicationW rozdziale 7 monografii przedstawiono zagadnienie diagnostyki czujnika prędkości silnika i przekładni mechanicznej pociągu. Przedstawiono zagadnienia związane z diagnostyką czujnika prędkosci obrotowej silnika oraz układu transmisjii momentu trakcyjnego. Do diagnostyki wykorzystano analizę sygnałów prędkości obrotowej i momentu obciążenia silnika obliczanych przez układy obserwatorów stanu. Analiza chwilowych wartości obliczonej...
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Recent Results from Studies of Electric Discharges in the Mesosphere
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Preliminary analysis of diesel electric ships propulsion solution
PublicationArtykuł zawiera opis wytwarzania i transmisji mocy układów disel-elektrycznych. Referat zwraca uwagę na problemy dotyczące zastosowania tych układów na statkach oraz pokazuje rozwój napędów disel-elektrycznych w ostatnim czasie.
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Napęd elektryczny w motoryzacji = The electric drive in motorization
PublicationWyczerpujące się zasoby ropy naftowej sprzyjają rozwojowi spekulacji cen paliw na giełdach światowych. Jednocześnie postępujący efekt cieplarniany zmusza inżynierów do poszukiwania nośników energii oraz napędów, które mógłby być alternatywnym rozwiązaniem zaistniałej sytuacji ekonomicznej oraz ekologicznej. Użycie silników elektrycznych do napędu pojazdów samochodowych jest pewną alternatywą rozwiązującą problem wysokich cen paliw...
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Structure and electric properties of double magnesium zirconium orthophosphate
PublicationPublikacja przedstawia wyniki pomiarów elektrycznych i strukturalnych ortofosforanu magnezowo-cyrkonowego.
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Sensorless induction motor drive for electric vehicle application
PublicationW artykule przedstawiono układ napędowy pojazdu elektrycznego wykorzystujący niezawodny i tani silnik prądu przemiennego. Zastosowany trójfazowy silnik asynchroniczny klatkowy wymaga zasilaniaz falownika napięcia przekształcającego napięcie stałe z akumulatorów na napięcie przemienne. Wykonany tranzystorowy przekształtnik sterowany jest mikroprocesorowo. Zastosowany procesor realizuje algorytm sterowania polowo zorientowanego,...
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Electric and thermoelectric properties of cement composites with expanded graphite
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Determination of odour concentration by TD-GC×GC–TOF-MS and field olfactometry techniques
PublicationField olfactometry is one of the sensory techniques used to determine odour concentration, in atmospheric air, directly in emission sources. A two-dimensional gas chromatography with time of flight mass spectrometer (GC×GC–TOF-MS) allows performing the chemical characterization of various groups of chemical compounds, even in complex mixtures. Application of these techniques enabled determination of odour concentration level in...
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Nondestructive corrosion degradation assessment based on asymmetry of guided wave propagation field
PublicationThe article presents the results of numerical and experimental investigation of guided wave propagation in steel plates subjected to corrosion degradation. The development of novel procedures allowing for the assessment of the corrosion degradation level is crucial in the effective diagnostics of offshore and ship structures that are especially subjected to aggressive environments. The study’s main aim is to investigate the influence...
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Study of prototype multi-pole non-salient field winding for high speed brushless synchronous generator
PublicationIn this paper a non-salient field winding for a brushless synchronous generator working with high speed in an autonomous energy generation system (e.g. airplane power grid) has been presented. A conception of a six-pole cylindrical-rotor with distributed field winding has been proposed. Comparison study of salient and prototype non-salient field winding has been carried out. Chosen simulation and measurement results of the generator...
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AN ORIGINAL APPROACH IN THE FIELD OF PREPARATION REFERENCE MATERIALS OF VOLATILE ANALYTES
PublicationStandard gas mixtures (SGM) are indispensable reference materials for ensuring the reliability of analytical work. Reference materials are an excellent tool for the quality control and assurance of analytical results. Standard gas mixtures are unique among reference materials. The rapid progress of SGM production is connected with the instability of gaseous analytes which make them difficult to obtain. The use of standards with...
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Minimization of a ship's magnetic signature under external field conditions using a multi-dipole model
PublicationThe 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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Magnetic field effects in dye-sensitized solar cells controlled by different cell architecture
PublicationThe charge recombination and exciton dissociation are generally recognized as the basic electronic processes limiting the efficiency of photovoltaic devices. In this work, we propose a detailed mechanism of photocurrent generation in dye-sensitized solar cells (DSSCs) examined by magnetic field effect (MFE) technique. Here we demonstrate that the magnitude of the MFE on photocurrent in DSSCs can be controlled by the radius and...
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Effectiveness of Random Field Approach in Serviceability Limit State Analysis of Strip Foundation
PublicationThis work conducts a probabilistic inquiry on how the variability of the parameter defining soil deformability affects the settlement of the foundation located on the soil. The analysis addresses the random foundation model to relevantly estimate the probability of allowable deflection exceedance. The constitutive model parameter is based either on a single random variable or a random field. The computations incorporate direct...
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Evaluation of the impact of geometry and plastic deformation on the stray magnetic field around the bone shaped sample
PublicationInfluence of two factors: the variable cross-section and the localized plastic deformation, which affect the stray magnetic field profile of a ferromagnetic sample have been studied. Evaluation of an effect size is based on the analysis of the stray magnetic field component which is tangential to the longest dimension of a sample. However, in order to describe the nature of the stray magnetic field, the normal component (perpendicular...
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The database of odd algebraic periods for quasi-unipotent self-maps of a space having the same homology group as the connected sum of g tori
Open Research DataThe dataset consists of 20 files indexed by numbers g=1,...,20. Each file provides sets of odd algebraic periods for all quasi-unipotent self-maps of a space having the same homology groups as the connected sum of g tori. Let us remark that each data set covers all algebraical restrictions that come from zeta functions for the sets of minimal Lefschetz...
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High Efficiency Dual-Active-Bridge Converter with Triple-Phase-Shift Control for Battery Charger of Electric Vehicles
PublicationAn optimal modulation scheme with triple-phase-shift (TPS) control could increase the efficiency in the entire load range for a dual-active-bridge (DAB) converter under wide output voltage range conditions. Therefore, this study proposes a convergent approach to TPS mode selection, coupled with an optimal modulation scheme, ensuring the circuit’s efficiency over the entire range in the realm of a high-power and high-efficiency...
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Modeling of performance of a AUV vehicle towards limiting the hydro-acoustic field.
PublicationSome results of research devoted to the modeling of a AUV-Stealth vehicle performance towards limiting its hydro-acoustic field are presented in the paper. At the beginning the AUV-Stealth autonomous underwater vehicle concept is described. Then the method of research is introduced. Next the key design drivers of the AUV-Stealth vehicle are presented. Between them are the AUV-Stealth hull form, arrangement of internal spaces,...
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The compliance of work with the chosen field of studies by Gdańsk University of Technology graduates – years 2010-2012
Open Research DataThe dataset includes data from the survey on the Gdańsk University of Technology graduates from years 2010-2012 on the compliance of their work with the chosen field of studies. The survey was conducted in the period from 2012 to 2014, two years after the respondents obtained graduate status. The research sample included 1586 respondents. Summarizing,...
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The compliance of work with the chosen field of studies of the Gdańsk University of Technology graduates – years 2013-2018
Open Research DataThe dataset includes data from the survey on the Gdańsk University of Technology graduates from years 2013-2018 on the compliance of their work with the chosen field of studies. The survey was conducted in the period from 2015 to 2020, two years after the respondents obtained graduate status. The research sample included 11190 respondents. Summarizing,...
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The decay of quantum correlations between quantum dot spin qubits and the characteristics of its magnetic-field dependence
PublicationWe address the question of the role of quantum correlations beyond entanglement in the context of quantum magnetometry. We study the evolution of the rescaled variant of the geometric quantum discord of two electron-spin qubits interacting with an environment of nuclear spins via the hyperfine interaction. We have found that quantum correlations display a strong magnetic-field sensitivity which can be utilized for decoherence-driven...
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MiMSeg - an algorithm for automated detection of tumor tissue on NMR apparent diffusion coefficient maps.
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Possibilities of quantitative and qualitative inventory of drainage devices based on selected maps and photogrammetric images
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Effect of Time Varying Measurement Conditions on Antenna Pattern in Near Field Measurement and Its Correction Procedure
PublicationAuthors present the procedure of taking into account the changes of electrical parameters of setup due to the time drift of temperature during the procedure of near field measurement. It is proposed to make additional measurements in determined positions of probe are next used the results to introduce corrections terms in measured data. Such approach was verified practically in experimental near field measurement system.
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Identification of aromatic compounds in odours mixture by gas chromatography and field olfactometry techniques
PublicationThis paper shows the results of investigation on identification aromatic compounds present in odorous mixture in atmospheric air samples collected in a vicinity of the oil refinery LOTOS S.A., located in Gdansk, during March and April period have be presented. The studies were conducted by the use of comprehensive two-dimensional gas chromatograph equipped with a cryogenic modulator and coupled with a time-of-flight mass spectrometer,...
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Time reversal invariant single-gap superconductivity with upper critical field larger than the Pauli limit in NbIr2B2
PublicationRecently, compounds with noncentrosymmetric crystal structure have attracted much attention for providing a rich playground in search for unconventional superconductivity. NbIr2B2 is a new member to this class of materials harboring superconductivity below Tc = 7.3(2) K and a very high upper critical field that exceeds Pauli limit. Here we report on muon spin rotation (μSR) experiments probing the temperature and field dependence...
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Field tests on hydrodynamic and hybrid operation of a bi-directional thrust bearing of a pump-turbine
PublicationIn vertical shaft pump turbines operating in pumped storage power plants an important role is played by a thrust bearing. Because of bi-directional character of operation, thrust bearing tilting pads have to be supported symmetrically, which is known to be unfavourable from the point of view of their performance. Large thrust bearings have to be carefully designed so as to minimise excessive thermo-elastic pad deformations. The...
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Estimation of the effectiveness of nbpt for limiting ammonia emission from urea based on the field experiments
PublicationThe efectiveness of the ammonia emission reduction from NBPT-stabilized urea was investigating in 2011 during a field experiment on a grassland plot fertilized with a one-time dose of 60 kgN/ha. The obtained reduction coefficient of ammonia emission equaled 73% and 39-51% relative to erea without the inhibitor and ammonium nitrate, respectively.
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Method of reconstructing two-dimensional velocity fields on the basis of temperature field values measured with a thermal imaging camera
PublicationThis paper describes a novel numerical reconstruction procedure (NRP) of the velocity field during natural convective heat transfer from a two-sided, isothermal, heated vertical plate based only on the known temperature field obtained, e.g. with a thermal imaging camera. It has been demonstrated that with a knowledge of temperature distributions, the NRP enables the reconstruction of velocity fields by solving the Navier-Stokes...
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Progressive failure analysis of laminates in the framework of 6-field nonlinear shell theory
PublicationThe paper presents the model of progressive failure analysis of laminates incorporated into the 6-field non-linear shell theory with non-symmetrical strain measures of Cosserat type. Such a theory is specially recommended in the analysis of shells with intersections due to its specific kinematics including the so-called drilling rotation. As a consequence of asymmetry of strain measures, modified laminates failure criteria must...
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The time-varying low-frequency magnetic-field emitted from the ship’s inverter-fed induction motor
Open Research DataThe dataset contains the magnetic field measurement results that are part of a comprehensive study on the assessment of the magnetic field emissions onboard of the research-training vessel. The measurements were carried out, nearby the bow thruster motor fed from the inverter, during maneuvering and the sea voyage. The bow thruster is assembled in the...
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Magetic field effects on organic electrophosphorescence.
PublicationPo raz pierwszy zarejestrowano kilkuprocentowy wzrost kwantowej wydajności elektroluminescencji (EL) w diodach z emiterami fosforescencyjnymi Ir(ppy)3 i PtOEP umieszczonymi w zewnętrznym polu magnetycznym. Zaobserwowane zmiany wyjaśniono na podstawie magnetycznej modulacji oddziaływań nadsubtelnych powodujących wzajemną konwersję singletowych i trypletowych skorelowanych par elektron-dziura (e-h).
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Short-fuse arc in the magnetic field
PublicationDo wymuszenia przerzutu prądu z bezpiecznika krótkotopikowego o dużym prądzie znamionowym, lecz małej zdolności wyłączania do do innego - o małym prądzie znamionowym, lecz dużej zdolności wyłączania konieczne jest wytworzenie przez bezpiecznik krótkotopikowy wysokiego napięcia łukowego. Do tego celu bezpiecznik z topikiem o długości 1 mm wyposażono w rożki łukowe i płykową komorę dejonizacyjną oraz zastosowano zewnętrzne pole...
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Covariance approach to the free photon field
PublicationWprowadziliśmy teorię fotonu poprzez tą samą zasadę, co dla pojedynczej czą-stki w kwantowej mechanice używając C*-algebraicznego podejścia kowariantychukładów.
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The upper critical field in doped MgCNi3
PublicationDyskutowany jest wpływ domieszkowania MgCNi3 na górne pole krytyczne (H_c2). H_c2 monotonicznie maleje wraz ze wzrostem koncentracji domieszki. Silniejszy wpływ widoczny w przypadku domieszkowania Fe może być tłumaczony poprzez efekt rozrywania nadprzewodzących par Coopera poprzez centra magnetyczne tworzone przez domieszki Fe.
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Earthwork calculations in various field conditions
PublicationThe article characterizes the continuation of ongoing work on the MUGO computer program. The analyzes refer to the modernization of railway lines and directly to the earthwork calculations. The methodology of calculating the earthwork size in the areas of fills and cuts is discussed in detail.
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International Journal of Emerging Electric Power Systems
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Field Methods (formerly: Cultural Anthropology Methods)
Journals