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Search results for: LUDGE REDUCTION
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Production of hydrogen from biomass and its separation using membranetechnology
PublicationHydrogen is an important raw material for chemical industry and feasible renewable energy carrier that could replace fossil fuels. However, the specie seldom exists in a form of pure H2. Therefore, to obtain hydrogen in volumes suitable to be used as a raw material it is necesary to decompose hydrogen-rich compounds. The carbohydrate-rich biomass can be an important source of hydrogen by applying the process of dark fermentation....
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Sensorless Control of Induction Motor Supplied by Current Source Inverter
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Diagnosis of bearing damage in induction motors by instantaneous power analysis
PublicationResearch of the machine with simulated bearing damages has been carried out, where variable load torque, simulating bearing damage, was introduced. The results show that components which can be used for bearings diagnosis appear in the spectrum of the product of current and supply voltage instantaneous values. These components are easier to identify than the components of current spectrum, which have been used so far in diagnostic...
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Hydrogen production from wood waste by mean of dark fermentation
PublicationThe utilization of wood wastes in clean and green chemistry method like by mean of dark fermentation, is a highly desired solution of waste management. In the article model for the estimation hydrogen potential of wood waste is given. The model has been used to calculate the potential theoretical hydrogen mass that can be produced from wood wastes in Pomerania and Silesia: pine, spruce, fir, beech and oak. In the introduction,...
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Detection and compensation of torque harmonics in drive with induction motor and gear
PublicationUkład mechaniczny przeniesienia napędu jest stosowany w większości elektrycznych układów napędowych. Właściwości przekładni mechanicznej powodują występowanie drgań moemntu w układzie. Analiza tych drgań, mierzonych np. za pomoca akcelerometrów, umozliwia detekcję uszkodzeń przekładni. Z uwiagi na trudności pomiatrowe dąży się jednak do eleminacji układów pomiarowych drgań przez zastąpienie ich metodami obliczeniowymi. Znając...
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Predicaments for the growth of the production subsector of the electric energy industry in Poland
PublicationPrzedstawiono uwarunkowania rozwoju elektroenergetyki w Polsce. Określono priorytety polityki energetycznej a w szczególności zagadnienia rozwoju podsektora wytwarzania. Przedstawiono ogólną ocenę i perspektywy rozwoju krajowej elektroenergetyki w okresie do 2030 r.
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Machine learning-based prediction of preplaced aggregate concrete characteristics
PublicationPreplaced-Aggregate Concrete (PAC) is a type of preplaced concrete where coarse aggregate is placed in the mold and a Portland cement-sand grout with admixtures is injected to fill the voids. Due to the complex nature of PAC, many studies were conducted to determine the effects of admixtures and the compressive and tensile strengths of PAC. Considering that a prediction tool is needed to estimate the compressive and tensile...
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Towards explainable motion prediction using heterogeneous graph representations
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Digital competence learning in secondary adult education in Finland and Poland
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Lignocellulosic Biomass from Grapevines as Raw Material for Particleboard Production
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Prediction of antimicrobial activity of imidazole derivatives by artificial neural networks
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DFT-based prediction of reactivity of short-chain alcohol dehydrogenase
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Main inductances of induction motor for diagnostically specialized mathematical models
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Ecological trends in machining as a key factor in sustainable production – A review
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Efficient production of B-substituted single-wall carbon nanotubes
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Modeling of production planning and control process consistent with theory of constraint
PublicationArtykuł dotyczy problematyki zastosowania metody werbel-bufor-lina do planowania produkcji w systemach produkcyjnych z wielokrotnymi buforami. W artykule przedstawiono algorytm - jego funkcje, dane wejściowe i wyjściowe - który może mieć zastosowanie do modelowania procesu planowania i sterowania produkcją. Algorytm umożliwia określenie wielkości czasowych buforów w systemie oraz terminów rozpoczęcia i zakończenia realizacji zadań....
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Over-Voltage Studies in Inverter Fed Induction Motor Drives
PublicationW pracy przedstawiono metodę identyfikacji pojemności pasożytniczych uzwojeń silników asynchronicznych uwzględniającą ich rozłożony charakter. Przedstawiony szerokopasmowy model obwodowy uzwojeń silnika asynchronicznego pozwala na modelowanie zjawisk przepięciowych w silnikach asynchronicznych, w szczególności zasilanych poprzez przekształtniki energoelektroniczne. Zaproponowana metoda analizy umożliwia również określanie składowych...
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Non-linear control of induction motor in field weakening region
PublicationW referacie przedstawiono układ sterowania silnikiem asynchronicznym klatkowym, oparty na modelu multiskalarnym. Dla zaproponowanej struktury wybrano dwa wektory do transformacji zmiennych stanu: wektor prądu stojana i wektor strumienia stojana. Przepro¬wadzono badania eksperymentalne na stanowisku badawczym z silnikami indukcyjnymi o mocy 22kW, w których do odtwarzania prędkości kątowej wykorzystano obserwator prędkości kątowej...
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100 years of the technical university education in Gdańsk 1904-2004.
PublicationNa tle warunków polityczno-społecznych książka przedstawia szczegółowo narodziny i działalność niemieckiej politechniki w Gdańsku w latach 1904-1945 oraz trudne początki Politechniki Gdańskiej po jej uruchomieniu w roku 1945. Angielskojęzyczna wersja książki pozwala na jej upowszechnienie za granicą, gdzie sprawy te nie są znane lub też są naświetlane dość jednostronnie.
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Simulation analysis of a production process with selected six sigma ratios
PublicationComputer technologies allow more and more to model as well as to perform simulation experiments of various processes. The simulation analysis provides a better understanding of the interdependencies between various stages of production processes.The results of simulation studies were presented, the aim of them was to show the opportunities of the analysis of the process according to the scenarios and variants developed in connection...
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Numerical prediction of steady and unsteady tip vortex cavitation on hydrofoils
PublicationArtykuł przedstawia metodę numeryczną do wyznaczania kawitujących wirów wierzchołkowych powstających za płatami nośnymi. Metoda ta jest oparta na rozwiązywanie dwufazowego turbulentnego przepływu cieczy lepkiej. Pozwala ona wyznaczyć geometrię kawitującego wiru dla różnych geometrii płata nośnego i dla różnych parametrów przepływu. Pokazano porównanie wyników obliczeń z pomiarami i rejestracjami wykonanymi na modelu płata w tunelu...
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Portable reactor with LTCC electrodes for production of plasma activated water
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Autonomous Energy Matching Control in an LLC Induction Heating Generator
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Dual-Frequency Induction Heating Generator With Adjustable Impedance Matching
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Heat calculations for water-cooled radiators of the inverter for induction heating
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Simulation of induction hardening of flat surfaces of moving massive elements
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Induction heating laboratory stand for estimating thermal properties of a charge
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The optimisation of induction heating system based on multiquadric function approximation
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Liquid Biopsy in Melanoma: Significance in Diagnostics, Prediction and Treatment Monitoring
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Cost efficiency of administrative service in public higher education in Poland
PublicationPurpose: The aim of the study is to determine changes in the cost efficiency of the administration of public higher education in Poland. Design/methodology/approach: The biennial cost Malmquist productivity index was used to study changes in cost efficiency of 58 public higher education institutions in 2014-2016. The results were...
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Research on and Assessment of the Reliability of Railway Transport Systems with Induction Motors
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Modified titanate nanotubes for the production of novel aliphatic polyurethane nanocomposites
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Emerging developments in ASEAN–China relations in regional production linkages
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Induction of the Stringent Response Underlies the Antimicrobial Action of Aliphatic Isothiocyanates
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Broken rotor bar impact on sensorless control of induction machine
PublicationThe aim of the research is analysis of the sensorless control system of induction machine with broken rotor for diagnostic purposes. Increasing popularity of sensorless controlled variable speed drives requires research in area of reliability, range of stable operation, fault symptoms and application of diagnosis methods. T transformation (Cunha et al.,2003) used for conversion of instantaneous rotor currents electrical circuit...
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Prediction of the Results of Chatter Vibration Surveillance by the Spindle Speed Control
PublicationDrgania samowzbudne typu chatter są istotnym zjawiskiem występującym podczas obróbki szybkościowej (HSM) z użyciem smukłych narzędzi. Zastosowanie optymlano-liniowego sterowania prędkością obrotową narzędzia w celu nadzorowania drgań pozwoliło zredukowac te drgania. W artykule przedstawiono sposób predykcji rezultatów nadzorowania z użyciem dwóch różnch modeli dynamiki skrawania zastosowanych w symulacjach komputerowych.
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Ductile fracture prediction in thin metallic plates subjected to explosions
PublicationPraca dotyczy modelowania zniszczenia ciągłego. Zaprezentowano wyniki eksperymentów przeprowadzonych na płytach metalowych poddanych eksplozjom oraz wyniki jednoosiowych prób laboratoryjnych. Opisano przyjęty model prawa konstytutywnego oraz kryteriów zniszczenia. Przedstawiono identyfikację parametrów materiałowych dla przyjętego modelu. Zaprezentowano model numeryczny oraz wyniki symulacji które następnie porównano z wynikami...
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Photocatalytic activity of layered MoS2 in the reductive degradation of bromophenol blue
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Reductive Photodegradation of 4,4′-Isopropylidenebis(2,6-dibromophenol) on Fe3O4 Surface
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The two faces of pyocyanin - why and how to steer its production?
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The efficiency of scientific activities and technology transfer in higher education in Poland
PublicationThe objective of the article is to measure and evaluate the efficiency of scientific activity and technology transfer to the economy by public higher education institutions (HEIs) in Poland and to formulate recommendations for state policy to increase the effectiveness of the technology transfer process by them. The study measured scientific activity and technology transfer separately in two groups of higher education institutions...
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Sensorless Fault Detection of Induction Motor with Inverter Output Filter
PublicationThe paper presents the problem of monitoring and fault detection of a sensorless voltage inverter fed squirrel cage induction motor with LC filter. The detection is based on load torque estimation of the investigated torque transmission system. The load torque is calculated besides the computation of other variables that are mandatory for sensorless drive operation such as rotor flux and speed. The implemented LC filter smooths...
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Model of the double-rotor induction motor in terms of electromagnetic differential
PublicationThe paper presents a concept, a construction, a circuit model and experimental results of the double-rotor induction motor. This type of a motor is to be implemented in the concept of the electromagnetic differential. At the same time it should fulfill the function of differential mechanism and the vehicle drive. One of the motor shafts is coupled to the direction changing mechanical transmission. The windings of the external rotor...
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Skill of remote sensing snow products for distributed runoff prediction
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Development of Education Tomorrow’s Engineers at the Faculty of Mechanical Engineering in GUT
PublicationPaper presents educational activity of Faculty of Mechanical Engineering of the Gdańsk University of Technology. Faculty of Mechanical Engineering is one of the largest departments of the Gdańsk University of Technology (GUT), currently educating about 3 000 student. The Faculty of Mechanical Engineering offers studies in different areas: Mechanical Engineering, Medical and Mechanical Engineering, Materials Engineering, Mechatronic,...
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Sensorless Control of Induction Machine Supplied by Current Source Inverter
PublicationThe paper describes the voltage control technique of induction machines supplied by a current source inverter. The control system is based on proposed new multi-scalar variables, which are named “r.” The control system contains the output filter capacitor's model. In the sensorless control system the Z type backstepping speed observer was applied. The mathematical dependences are confirmed by simulation and experimental research.
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Five-phase induction motor drive with sine-wave filter
PublicationThe paper presents closed loop ac drive with 5 phase induction motor operating with voltage source inverter and sine wave filter. The motor supply voltages and currents have sinusoidal shape. For well known adjustable electric drives the field oriented control method with flux and speed co ntrol can be applied. In the presence of output filter both control and estimation algorithms should be modified due to sine wave filter installation....
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First Outcomes of an Investigation about Daylighting Knowledge and Education in Europe
PublicationDAYKE (Daylighting Knowledge in Europe) is a project to investigate the daylighting knowledge and skills of Architecture students and practitioners from different countries within the European Union. This paper introduces the first stage of the research and provides results from a direct survey taken by 161 students from seven schools of Architecture: two in Italy, one in The Netherlands, two in Poland and two in Spain. The results...
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Applicability of Emotion Recognition and Induction Methods to Study the Behavior of Programmers
PublicationRecent studies in the field of software engineering have shown that positive emotions can increase and negative emotions decrease the productivity of programmers. In the field of affective computing, many methods and tools to recognize the emotions of computer users were proposed. However, it has not been verified yet which of them can be used to monitor the emotional states of software developers. The paper describes a study carried...
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MSRL 2.0. as a new method for research education on urban issues
PublicationThe MSRL 2.0. research is focused on the Baltic Sea Region (BSR) as a multidimensional urban phenomenon with Gdansk acting as a hub for the research teams. The idea of the MSRL 2.0. is to promote the collaboration of professionals and graduate and PhD students by bringing together the mentor(s) with a local research team sharing experiences and proposing strategic recommendations to strengthen sustainable urban development initiatives...