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Heat Transfer Optimization of end Winding Rotor Generator by the Use of Modified Axial Spacer: A Case Study

Journal of Physics: Conference Series 2021年第1期1845卷

作者： Y Baskoro I Jaya A Glowacz M Sulowicz W Caesarendra PT Indonesia Power Indonesia Department of Automatic Control and Robotics AGH University of Science and Technology 30-059 Kraków Poland Institute of Electromechanical Energy Conversion Faculty of Electrical and Computer Engineering Cracow University of Technology Warszawska 24 31-155 Cracow Poland Faculty of Integrated Technologies Universiti Brunei Darussalam Jalan Tungku Link Gadong BE1410 Brunei Darussalam

This paper presents a case study of a rotor fault occurring in the rotor generator of a steam power plant located in Lontar, Banten Province, Indonesia. The steam power plant has 3 x 315 MV capacity and uses hydrogen in the cooling system. The issue arising during the operation was caused by heat transfer exceeding the normal level. The grounding of the rotor occurred through rising vibration and temperature, tripping the generator unit. During repairs, the axial spacer was replaced with a new model, where it is longer than the original, adding a bar spacer at a previously unavailable position and creating a cooling track profile. This is a case study on the replacement of the axial spacer model aimed at preventing the expansion of the winding, so as not to touch with each other, through the installation of a longer axial spacer and the addition of the spacer bar, and lastly adding the track profile to the cooling hydrogen gas flow thereby maximizing the cooling process from the end winding rotor generator. Heat transfer is an analysed parameter related to the model change of the axial spacer. The addition of a track cooling gas flow has been able to maximize the heat transfer process, which is simulated in this paper. The performance of the rotor generator increased through several parameters after the replacement of the axial spacer model.

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Constraining Lens Masses in Moderately to Highly Magnified Microlensing Events from Gaia

arXiv

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arXiv 2025年

作者： Pylypenko, U. Wyrzykowski, L. Mikolajczyk, P.J. Kotysz, K. Zieliński, P. Ihanec, N. Wicker, M. Ratajczak, M. Sitek, M. Howil, K. Jablońska, M. Kaczmarek, Z. Kruszyńska, K. Udalski, A. Damljanovic, G. Stojanovic, M. Jovanovic, M.D. Kvernadze, T. Kvaratskhelia, O. Zejmo, M. Brincat, S.M. Qvam, J.K.T. Güver, T. Bachelet, E. Rybicki, K.A. Garofalo, A. Hardy, L. Zdanavicius, J. Pakstiene, E. Zola, S. Kurowski, S. Reichart, D.E. Davidson, J.W. Burgaz, U. Rivet, J.P. Jelinek, M. Popowicz, A. Esenoglu, H.H. Sonbas, E. Carrasco, J.M. Awiphan, S. Tasuya, O. Godunova, V. Simon, A. Fukui, A. Galdies, C. Bakowska, K. Hofbauer, P. Gurgul, A. Joachimczyk, B. Dominik, M. Tsapras, Y. Street, R.A. Hundertmark, M. Bozza, V. Rota, P. Cassan, A. Wambsganss, J. Figuera Jaimes, R. Astronomical Observatory University of Warsaw Al. Ujazdowskie 4 Warsaw00-478 Poland Astrophysics Division National Centre for Nuclear Research Pasteura 7 Warsaw02-093 Poland Astronomical Institute University of Wroclaw ul. Mikolaja Kopernika 11 Wroclaw51-622 Poland Institute of Astronomy Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University in Toruń Grudziadzka 5 Toruń87-100 Poland Faculty of Mathematics and Computer Science Jagiellonian University Lojasiewicza 6 Kraków30-348 Poland Research School of Astronomy and Astrophysics Australian National University Mount Stromlo Observatory Cotter Road Weston CreekACT2611 Australia Zentrum für Astronomie der Universität Heidelberg Astronomisches Rechen-Institut Mönchhofstr. 12-14 Heidelberg69120 Germany Las Cumbres Observatory Global Telescope Network 6740 Cortona Drive suite 102 GoletaCA93117 United States Astronomical Observatory Volgina 7 Belgrade11060 Serbia E.Kharadze Georgian National Astrophysical Observatory Abastumani0301 Georgia Janusz Gil Institute of Astronomy University of Zielona Góra Lubuska 2 Zielona GóraPL-65-265 Poland Flarestar Obsevatory Fl.5 Ent.B Silver Jubilee Apt George Tayar Street San GwannSGN 3160 Malta Horten Videregaende Skole Strandpromenaden 33 Horten3183 Norway Istanbul University Faculty of Science Department of Astronomy and Spaces Sciences Istanbul34119 Turkey Istanbul University Observatory Research and Application Center Istanbul University Istanbul34119 Turkey Department of Physics Adıyaman University Adıyaman02040 Turkey Department of Physics The George Washington University WashingtonDC20052 United States IPAC Mail Code 100-22 Caltech 1200 E. California Blvd. PasadenaCA91125 United States Department of Particle Physics and Astrophysics Weizmann Institute of Science Rehovot76100 Israel INAF-Osservatorio di Astrofisica e Scienza dello Spazio Via Gobetti 93/3 BolognaI-40129 Italy Department of Physics and Astronom

Context. Microlensing events provide a unique way to detect and measure the masses of isolated, non-luminous objects, particularly dark stellar remnants. Under certain conditions, it is possible to measure the mass of these objects using photometry alone, specifically when a microlensing light curve displays a finite-source (FS) effect. This effect generally occurs in highly magnified light curves, i.e. when the source and the lens are very well aligned. Aims. In this study, we analyse Gaia Alerts and Gaia Data Release 3 datasets, identifying four moderate-to-high-magnification microlensing events without a discernible FS effect. The absence of this effect suggests a large Einstein radius, implying substantial lens masses. Methods. In each event, we constrain the FS effect and therefore establish lower limits for angular Einstein radius and lens mass. Additionally, we use the DarkLensCode software to obtain mass, distance, and brightness distribution for the lens based on the Galactic model. Results. Our analysis established lower mass limits of ∼ 0.2 M☉ for one lens and ∼ 0.3 − 0.5 M☉ for two others. DarkLensCode analysis supports these findings, estimating lens masses in the range of∼ 0.42 − 1.66 M☉ and dark lens probabilities exceeding 60%. These results strongly indicate that the lenses are stellar remnants, such as white dwarfs or neutron stars. Conclusions. While further investigations are required to confirm the nature of these lenses, we demonstrate a straightforward yet effective approach to identifying stellar remnant candidates. © 2025, CC BY.

关键词： White dwarfs

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Application of reiteration of Hankel singular value decomposition in quality control

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AIP Conference Proceedings 2017年第1期1863卷

作者： Michał Staniszewski Agnieszka Skorupa Łukasz Boguszewicz Agnieszka Michalczuk Kamil Wereszczyński Magdalena Wicher Marek Konopka Maria Sokół Andrzej Polański aSilesian University of Technology Faculty of Automatic Control Electronics and Computer Science Institute of Informatics Akademicka 16 Gliwice Poland bMariaSkłodowska-Curie Memorial Cancer Center and Institute of Oncology Gliwice Branch Department of Medical Physics ul. Wybrzeze Armii Krajowej Gliwice Poland cScanxMedicalImaging Sp. z o.o. ul. PCK 10 Katowice Poland

Medical centres are obliged to store past medical records, including the results of quality assurance (QA) tests of the medical equipment, which is especially useful in checking reproducibility of medical devices and procedures. Analysis of multivariate time series is an important part of quality control of NMR data. In this work we proposean anomaly detection tool based on Reiteration of Hankel Singular Value Decomposition method. The presented method was compared with external software and authors obtained comparable results.

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Performance Analysis of a Cloud Computing System using Queuing Model with Correlated Task Reneging

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Journal of Physics: Conference Series 2021年第1期2091卷

作者： Rakesh Kumar Bhavneet Singh Soodan Godlove Suila Kuaban Piotr Czekalski Sapana Sharma School of Mathematics Shri Mata Vaishno Devi University Katra Jammu and Kashmir 182320 India Department of Mathematics and Statistics Namibia University of Science and Technology Private Bag 13388 Windhoek Namibia 13 Jackson Kaujeua Street Windhoek Namibia Institute of Theoretical and Applied Informatics Polish Academy of Sciences Baltycka 5 44-100 Gliwice Poland Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Department of Mathematics Cluster University of Jammu Jammu and Kashmir

Queuing theory has been extensively used in the modelling and performance analysis of cloud computing systems. The phenomenon of the task (or request) reneging, that is, the dropping of requests from the request queue often occur in cloud computing systems, and it is important to consider it when developing performance evaluations models for cloud computing infrastructures. Majority of studies in the performance evaluation of cloud computing data centres with the use of queuing theory do not consider the fact that the tasks could be removed from queue without being serviced. The removal of tasks from the queue could be due to the user impatience, execution deadline expiration, security reasons, or as an active queue management strategy. The reneging could be correlated in nature, that is, if a request is dropped (or reneged) at any time epoch, and then there is a probability that a request may or may not be dropped at the next time epoch. This kind of dropping (or reneging) of requests is referred to as correlated request reneging. In this paper we have modelled a cloud computing infrastructure with correlated request reneging using queuing theory. An M/M/1/N queuing model with correlated reneging has been used to study the performance analysis of the load balancing server of a cloud computing system. The steady-state as well as the transient performance analyses have been carried out. Important measures of performance like average queue size, average delay, probability of task blocking, and the probability of no waiting in the queue are studied. Finally, some comparisons are performed which describe the effect of correlated task reneging over simple exponential reneging.

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Adaptive observer for nonlinear fractional-order systems

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International Journal of Adaptive control and Signal Processing 2016年第3期31卷

作者： Ibrahima N'doye Taous-Meriem Laleg-Kirati Mohamed Darouach Holger Voos Computer Electrical and Mathematical Sciences and Engineering Division (CEMSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Research Center for Automatic Control of Nancy (CRAN UMR 7039 CNRS) University of Lorraine IUT de Longwy 186 rue de Lorraine 54400 Cosnes et Romain France Faculty of Science Technology and Communication (FSTC) University of Luxembourg 6 rue Richard Coudenhove-Kalergi L-1359 Luxembourg

In this paper, an adaptive observer is proposed for the joint estimation of states and parameters of a fractional nonlinear system with external perturbations. The convergence of the proposed observer is derived in terms of linear matrix inequalities (LMIs) by using an indirect Lyapunov *** proposed adaptive observer is also robust against Lipschitz additive nonlinear uncertainty. The performance of the observer is illustrated through some examples including the chaotic Lorenz and Lü's systems. Copyright © 2016 John Wiley & Sons, Ltd.

关键词： adaptive observer design fractional-order nonlinear system indirect Lyapunov approach linear matrix inequality (LMI) chaotic Lorenz system chaotic Lü's system

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Reiteration of Hankel singular value decomposition for modeling of complex-valued signal

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AIP Conference Proceedings 2016年第1期1738卷

作者： Michał Staniszewski Agnieszka Skorupa Łukasz Boguszewicz Magdalena Wicher Marek Konopka Maria Sokół Andrzej Polański aSilesian University of Technology Faculty of Automatic Control Electronics and Computer Science Institute of Informatics Akademicka 16 Gliwice Poland bMaria Skłodowska-Curie Memorial Cancer Center and Institute of Oncology Gliwice Branch Department of Medical Physics ul. Wybrzeze Armii Krajowej Gliwice Poland cScanx Medical Imaging Sp. z o.o. ul. PCK 10 Katowice Poland

Modeling signal which forms complex values is a common scientific problem, which is present in many applications, i.e. in medical signals, computer graphics and vision. One of the possible solution is utilization of Hankel Singular Value Decomposition. In the first step complex-valued signal is arranged in a special form called Hankel matrix, which is in the next step decomposed in operation of Singular Value Decomposition. Obtained matrices can be then reformulated in order to get parameters describing system. Basic method can be applied for fitting whole signal but it fails in modeling each particular component of signal. Modification of basic HSVD method, which relies on reiteration and is used for main components, and application of prior knowledge solves presented problem.

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Corrigendum to “Blood pressure disturbances and endothelial dysfunction markers in children and adolescents with type 1 diabetes” [Atherosclerosis 237 (2014) 129–134]

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Atherosclerosis 2015年第1期243卷 120-120页

作者： L. Machnica G. Deja J. Polanska L. Czupryniak E. Szymanska-Garbacz J. Loba P. Jarosz-Chobot Upper-Silesia Child Health Center ul. Medykow 16 40-752 Katowice Poland Dept. of Pediatrics Endocrinology and Diabetes Medical University of Silesia ul. Medykow 16 40-752 Katowice Poland Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology ul. Akademicka 16 44-101 Gliwice Poland Department of Internal Medicine and Diabetology Medical University of Lodz Lodz Poland

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Preface

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Studies in Computational Intelligence 2022年第4期1034卷 v-ix页

作者： Borangiu, Theodor Trentesaux, Damien Leitão, Paulo Cardin, Olivier Joblot, Laurent Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania LAMIH UMR CNRS 8201 Polytechnic University Hauts de France Valenciennes France Research Centre in Digitalization and Intelligent Robotics Polytechnic Institute of Bragança Bragança Portugal LS2N UMR CNRS 6004 IUT de Nantes University of Nantes Carquefou France Arts et Métiers Institute of Technology LISPEN HESAM Université UBFC Cluny France

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Properties of carbide electro-spark coatings after laser processing

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AIP Conference Proceedings 2018年第1期2017卷

作者： Norbert Radek Izabela Pliszka Aneta Gądek-Moszczak Jarosław Rolek Jana Petru 1Kielce University of Technology Faculty of Mechatronics and Mechanical Engineering Al. 1000-lecia Państwa Polskiego 7 25-314 Kielce Poland 2Cracow University of Technology Institute of Applied Informatics Faculty of Mechanical Engineering Al. Jana Pawła II 37 31-864 Cracow Poland 3Kielce University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Al. 1000-lecia Państwa Polskiego 7 25-314 Kielce Poland 4VSB-TU Ostrava Faculty of Mechanical Engineering Department of Machining Assembly and Engineering Metrology 17. listopadu 15/2172 70833 Ostrava-Poruba Czech Republic

The aim of the study was to determine the influence of the laser processing on the properties of electro-spark coatings. The properties were assessed by analyzing the coating microstructure, X-ray radiation, microhardness, corrosion resistance, porosity and tribological tests. In addition, the paper presents the results of measurements and analysis of electrical pulse during ESD. The tests were carried out on WC-Cu coating (the anode) obtained by electro spark deposition over carbon steel C45 (the cathode) and molten with a laser beam. The coatings were deposited by means of the EIL-8A and they were laser treated with the Nd:YAG. The tests show that the laser-treated electro-spark deposited WC-Cu coatings are characterized by lower hardness and friction force, higher seizure resistance, roughness. The laser treatment process causes the homogenization of the chemical composition, the structure refinement and the healing of microcracks and pores of the electro-spark deposited coatings. Laser treated electro-spark deposited coatings are likely to be applied in sliding friction pairs and as protective coatings.

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IDF2022-1183 The effect of multi-strain probiotics on diarrhea in patients with type 2 diabetes and metformin intolerance

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Diabetes Research and Clinical Practice 2023年 197卷 110340-110340页

作者： Nabrdalik, K. Drożdż, K. Kwiendacz, H. Skonieczna-Żydecka, K. Łoniewski, I. Kaczmarczyk, M. Nalepa, J. Holleman, F. Nieuwdorp, M. Gumprecht, J. Medical University of Silesia in Katowice Faculty of Medical Sciences in Zabrze Department of Internal Medicine Diabetology and Nephrology Zabrze Poland Pomeranian Medical University in Szczecin Department of Human Nutrition and Metabolomics Szczecin Poland Pomeranian Medical University in Szczecin Department of Biochemical Sciences Szczecin Poland Pomeranian Medical University in Szczecin Department of Clinical and Molecular Biochemistry Szczecin Poland Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Department of Algorithmics and Software Gliwice Poland Universiteit van Amsterdam- Amsterdam UMC Department of Internal Medicine Amsterdam The Netherlands Universiteit van Amsterdam Amsterdam UMC Department of Internal Medicine Section Vascular Medicine Amsterdam The Netherlands

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