Wyniki wyszukiwania dla: skurcz

• EXPERIMENTAL ANALYSIS OF CONNECTION BETWEEN OBJECT-ORIENTED METRICS AND SOFTWARE CHANGEABILITY

  Publikacja

  • T. Sanner
  • A. Czyżewski

  - Rok 2013

  For the purpose of video surveillance software quality assessment in this work the ISO/IEC-9126 norm was used with a particular focus on maintainability of the software system. The paper presents a study on the connection between software metrics derived from the static analysis of the source code and changeability of the video surveillance software system. It is shown that meeting requirements of software quality metrics may result...

• Start-up of a power unit of a thermal power plant auxiliary systems with supply from a hydropower plant

  Publikacja

  • J. Klucznik
  • Z. Lubośny
  • K. Dobrzyński

  - Acta Energetica - Rok 2013

  This article discusses the issues related to a power unit of a thermal power plant start-up with the use of a hydropower plant. Hydropower plant can supply and will enable start-up of auxiliary equipment in a power unit of a thermal power plant. Due to high capacity of auxiliary drives, start-up of auxiliaries in a thermal power plant after blackout (and boiler shutdown) is not possible from emergency energy sources in the power...

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• System wspomagający zarządzanie Wydziałem Elektroniki, Telekomunikacji i Informatyki Politechniki GdańskiejW : Perspektywy Rozwoju e-Uczelni w Kontekście Globalnej Informatyzacji; - e-uczelnia, konferencja krajowa; 14-15 maja 2009, Gdańsk. - [skrypt prezentacji]

  Publikacja

  • A. Cholewiński
  • K. Goczyła
  • M. Michalski

  - Rok 2009

  W artykule przedstawiono założenia projektowe, architekturę i implementację systemu przeznaczonego do wspomagania zarządzania wydziałem wyższej uczelni. System jest realizowany dla Wydziału Elektroniki, Telekomunikacji i Informatyki Politechniki Gdańskiej, w technologiach typu open-source. Artykuł opisuje poszczególne komponenty systemu oraz aspekty technologiczne jego budowy. Opisano założenia przyjęte na początku projektu, architekturę...

• System wspomagający zarządzanie Wydziałem Elektroniki, Telekomunikacji i Informatyki Politechniki Gdańskiej

  Publikacja

  • A. Cholewiński
  • K. Goczyła
  • M. Michalski

  - Rok 2009

  W artykule przedstawiono założenia projektowe, architekturę i implementację systemu przeznaczonego do wspomagania zarządzania wydziałem wyższej uczelni. System jest realizowany dla Wydziału Elektroniki, Telekomunikacji i Informatyki Politechniki Gdańskiej, w technologiach typu open-source. Artykuł opisuje poszczególne komponenty systemu oraz aspekty technologiczne jego budowy. Opisano założenia przyjęte na początku projektu, architekturę...

• ENERGY STORAGE IN COMPRESSED AIR – SOLUTION SUPPORTING RENEWABLE ENERGY SOURCES

  Publikacja

  • D. Jakowski
  • M. Dzida

  - Journal of Polish CIMEEAC - Rok 2014

  This article presents a brief description of a power system, the current national power system daily load, the use of wind power as a renewable energy source and its share in the national load. It also discusses the methods for storing energy, their characteristics and possible solutions. The power storage and generation solution proposed in the article is based on the collaboration between a gas turbine and an air storage system....

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• Software Tools to Measure the Duplication of Information

  Publikacja

  • M. Kostrzewski

  - Journal of Applied Computer Science - Rok 2014

  Data stored in average computer system usually is not unique, portions of stored data are duplicated. When duplicated data are stored in separate files containing source code of computer program of student homework, a possibility of cheating should be seriously considered. This paper presents software tools built, in order to detect re-use of pieces of code in supplied text files. Three aspects of information atching are considered:...

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• Easy formation of acyl-Meldrum's acid anhydride

  Publikacja

  • N. Pawelska
  • S. Makowiec

  - Rok 2011

  Acyl Meldrum's acid are usually a good source of ketenes upon definite thermal composition. However we treated acyl-Meldrum's acid with the Lewis acid and we observed formation of 5[[(2,2-dimethyl-4,6-dioxo-1,3-dioxan 5 ylidene)(acyl/arylamino)mathoxy](acyl/arylamino)methylene]-2,2dimethyl-1,3-dioxane-4,6 dione which means acyl-Meldrum's acid anhydride. The chemical properities of acyl-Meldrum's acid anhydride were explored.

• Trust, Collaborative Culture and Tacit Knowledge Sharing in Project Management–a Relationship Model

  Publikacja

  • W. Kucharska
  • R. Kowalczyk

  - Rok 2016

  The aim of this research is to study the relationship between Trust, Collaborative Culture, and Tacit Knowledge Sharing in Project Management as a source of Team Creativity in the context of delivering value through knowledge. For this purpose authors conducted a study of 514 Polish professionals with different functions and experience in managing projects in construction industry. The data collected during the study has been analysed...

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• Photocatalytic activity of solvothermal prepared BiOClBr with imidazolium ionic liquids as a halogen sources in cytostatic drugs removal

  Publikacja

  • P. Wilczewska
  • A. Bielicka-giełdoń
  • A. Fiszka Borzyszkowska
  • J. Ryl
  • T. Klimczuk
  • E. Siedlecka

  - JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY - Rok 2019

  In this work, the BiOClBr, as a new family of bismuth based semiconductors, was successfully applied to remove of cytostatic drugs from water under UV-Vis light irradiation. BiOCl, BiOBr and BiOClBr were synthesized using two steps solvothermal method in glycerol. The inorganic salts (KCl and KBr) and 1-butyl-3-metylimidazolium chloride (BmimCl) and 1-butyl-3-metylimidazolium bromide (BmimBr) ionic liquids (ILs) were used as the...

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• Polychlorinated Biphenyls (PCBs) and Polycyclic Aromatic Hydrocarbons (PAHs): Sediments and Water Analysis

  Publikacja

  • J. Rogowska
  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - Rok 2013

  Unfavorable side effects of different forms of anthropogenic activities can be found anywhere in the world. One of the basic characteristics of pollutants entering marine and ocean waters is their spread and movement in the global ocean. A portion of the substances entering the marine environment is rapidly degraded by chemical processes occurring in the air, sediments, and water, thereby losing their toxic properties. The biggest...

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• Leukemia and risk of recurrent Escherichia coli bacteremia: genotyping implicates E. coli translocation from the colon to the bloodstream.

  Publikacja

  • A. Samet
  • A. Śledzińska
  • B. Krawczyk
  • A. Hellmann
  • S. Nowicki
  • J. Kur
  • B. Nowicki

  - EUROPEAN JOURNAL OF CLINICAL MICROBIOLOGY & INFECTIOUS DISEASES - Rok 2013

  In patients with leukemia, the portal(s) and reasons for the persistence of an Escherichia coli recurrent bacteremia remain unclear. Adult Hematology Clinic (AHC) databases at the State Clinical Hospital in Gdańsk were reviewed to evaluate the frequency of E. coli bacteremia between 2002 and 2005. Blood and bowel E. coli strains were obtained and the genetic relatedness of the strains was analyzed. The rate of E. coli bacteremia...

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• ROYAL CHAPEL IN GDANSK. STUDY OF FACILITY INVENTORY WITH THE USAGE OF LASER SCANNING WITHIN THE FRAMES OF STUDENT PROJECT

  Publikacja

  • P. Laskowski
  • J. Szulwic

  - Rok 2014

  This article presents the photogrammetric works carried out during the architectural inventory of the Royal Chapel in the Main Town of Gdansk (Poland). The facility has the status of a monument of architecture and since decades it is covered by geodetic monitoring, realized with the participation of the Department of Geodesy of Faculty of Civil and Environmental Engineering of Gdańsk University of Technology . For several years,...

• Static Series and Shunt-series PE Voltage-quality Controllers

  Publikacja

  • R. Strzelecki
  • D. Wojciechowski
  • G. Benysek

  - Rok 2007

  As presented in the Chap. 7 static shunt power electronics (PE) voltage-quality controllers protect the utility electrical system from the unfavorable impact of customer loads. Shunt controllers, as shown in Chap. 6, are recommended mainly for mitigation of the causes of disturbances, and not their effects in distanced nodes of a power-electronics system. In the case when reduction of disturbances effects is required, which leads...

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• Mass Spectrometric Identification of 13C-labeled Metabolites During anaerobic Propanoic Acid Oxidation

  Publikacja

  • M. Felchner-Żwirełło
  • J. Winter
  • C. Gallert

  - CHEMISTRY & BIODIVERSITY - Rok 2012

  Biowaste digestion is a possibility to gain biogas as a renewable fuel source. However, the anaerobic food chain may be disrupted by, e.g., substrate overload or by inhibitors, leading to the accumulation of volatile fatty acids (VFAs), predominantly of propanoic acid (PA). VFA Accumulation may cause a rapid pH decrease, less biogas production, or even a total inhibition. To maintain high biogas productivity or to prevent a collapse...

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• Searching for innovation knowledge: insight into KIBS companies

  Publikacja

  • E. Bolisani
  • M. Zięba
  • P. Marco
  • E. Scarso

  - Rok 2015

  Purpose – The paper analyzes the patterns of research of “innovation knowledge” (i.e. knowledge that can result in introducing innovations in the company that can be observed in KIBS (Knowledge-Intensive Business Services) companies. Particularly, it identifies and classifies the possible approaches adopted by companies on the basis of two dimensions: the intensity/proactivity of search efforts, and the source primarily used. Design/methodology/approach...

• Aspekty Edukacyjne Wirtualnych Światów. Aplikacja Second Life

  Publikacja

  • P. Topol
  • W. Kowalewski
  • I. Mokwa-Tarnowska
  • P. Leszczyński
  • M. Kołowska-gawiejnowicz
  • I. Siatkowski
  • A. Ren-kurc

  - Journal Education, Technology and Computer Science - Rok 2017

  Artykuł koncentruje się na trójwymiarowych środowiskach wirtualnych i ich funkcjonalności edukacyjnej na przykładzie świata Second Life. Wbrew opiniom pojawiającym się od czasu do czasu w literaturze przedmiotu światy wirtualne 3D nie odchodzą w przeszłość, przynajmniej nie w sektorze edukacyjnym. Autorzy artykułu próbują to wykazać,przedstawiając różne aspekty Second Life w zastosowaniach dydaktycznych, naukowych,...

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• Styrene Oxidation by Copper(II) Complexes Salen-Type Encapsulated into Nay Zeolite

  Publikacja

  • I. Kuźniarska-Biernacka
  • M. Carvalho
  • I. C. Neves
  • A. M. Fonseca
  • A. Lisińska-Czekaj
  • D. Czekaj

  - ARCHIVES OF METALLURGY AND MATERIALS - Rok 2013

  The copper(II) complex with a Schiff-base salen-type ligand has been encapsulated in the nanopores of a NaY zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. The encapsulated and non-encapsulated copper(II) complexes were screened as catalysts for styrene oxidation by using TBHP as the oxygen source in acetonitrile solvent. Under the optimized conditions, the catalysts exhibited...

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• Low harmonic multipulse voltage converters using coupled reactors

  Publikacja

  • R. Strzelecki
  • T. Sak
  • M. Grabarek
  • P. Zolov
  • N. Strzelecka

  - Rok 2016

  This paper presents a novel approach to the multi pulse voltage converters (VC), especially voltage source inverters (VSI) and matrix converters (MC) based on several typical identical modules connected in parallel using coupled reactors. Such arrangements resulting in lower voltage distortions at extremely low switching frequency. The proposed arrangement was validated by simulation. Laboratory models of 18- and 24pulse 3-level...

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• The forming and emission of high power electromagnetic pulses

  Publikacja

  • M. Nowak
  • K. Jakubiuk
  • D. Kowalak

  - Rok 2018

  An impulse energy source, a power conditioning system and an electromagnetic field emitter are essential to generate an electromagnetic field pulse (EMFP) with a specific frequency bandwidth. Selected simulation results for a power conditioning system consisting of a fuse opening switch and a paraboloidal electromagnetic emitter have been presented in this article. The synthetic system examined in the simulation is powered by...

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• Metody korekcji zniekształceń dźwięku i obrazu opracowane w ramach europejskiego projektu PrestoSpace

  Publikacja

  • A. Czyżewski
  • P. Maziewski
  • A. Kupryjanow
  • M. Papaj

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2008

  W referacie przedstawiono przegląd prac badawczo-wdrożeniowych wykonanych przez autorów w ramach projektu PrestoSpace w 6. Programie Ramowym Unii Europejskiej. Opisano metody i algorytmy korekcji zniekształceń fonicznych, takich jak szum szerokopasmowy oraz kołysanie i drżenie dźwięku, a także korekcji zniekształceń obrazu spowodowanych skurczem taśm filmowych. Wdrożone algorytmy zostały pozytywnie ocenione przez archiwistów stosujących...

• Metody korekcji zniekształceń dźwięku i obrazu opracowane w ramach europejskiego projektu PrestoSpace

  Publikacja

  • A. Czyżewski
  • P. Maziewski
  • A. Kupryjanow
  • M. Papaj

  - Rok 2008

  W referacie przedstawiono przegląd prac badawczo-wdrożeniowych wykonanych przez autorów w ramach projektu PrestoSpace w 6. Programie Ramowym Unii Europejskiej. Opisano metody i algorytmy korekcji zniekształceń fonicznych, takich jak szum szerokopasmowy oraz kołysanie i drżenie dźwięku, a także korekcji zniekształceń obrazu spowodowanych skurczem taśm filmowych. Wdrożone algorytmy zostały pozytywnie ocenione przez archiwistów stosujących...

• From U2TP Models to Executable Tests with TTCN-3

  Publikacja

  • J. Zander
  • Z. R. Dai
  • I. Schieferdecker
  • G. Din

  - Rok 2005

  The approach towards system engineering according to Model-Driven Architectures (MDA) with code generation derived from model implies also an increased need for research on automation of the test generation process. This paper presents an approach to derive executable tests from UML 2.0 Testing Profile diagrams automatically. In particular, an approach to derive executable tests within the Testing and Test Control Notation (TTCN-3)...

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• The use of a genetic algorithm in the process of optimizing the shape of a three-dimensional periodic beam

  Publikacja

  • Ł. Doliński
  • A. Żak
  • W. Waszkowiak
  • P. Kowalski
  • J. Szkopek

  - Journal of Theoretical and Applied Mechanics - Rok 2024

  Mechanical periodic structures exhibit unusual dynamic behavior thanks to the periodicity of their structures, which can be attributed to their cellular arrangement. The source of this periodicity may result from periodic variations of material properties within their cells and/or variations in the cell geometry. The authors present the results of their studies on the optimization of physical parameters of a three-dimensional axisymetrical...

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• Application of chromogenic dye in biogenic amines determination using spectrophotometry

  Publikacja

  • K. Kalinowska
  • M. Tobiszewski

  - Rok 2021

  Biogenic amines content can be the source of information in the field of freshness and suitability of certain foods for consumption. However, most analytical methods for their determination require complicated sample preparation and expert knowledge. Because of that, a novel approach based on chromogenic dye application was proposed. After the SN1 reaction of an amine with S 0378 dye, the absorbance of the solution was measured...

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• Numerical modeling of sound intensity distributions around acoustic transducer

  Publikacja

  • A. Kurowski
  • J. Kotus
  • B. Kostek
  • A. Czyżewski

  - Rok 2016

  The aim of this research study is to measure, simulate and compare sound intensity distribution generated by the acoustic transducers of the loudspeaker. The comparison of the gathered data allows for validating the numerical model of the acoustic radiation. An accurate model of a sound source is necessary in mathematical modeling of the sound field distribution near the scattering obstacles. An example of such obstacle is a human...

• The use of low-coherence interferometer for sugar content determination

  Publikacja

  • M. Szczerska

  - Rok 2015

  In this article, the implementation of low-coherence interferometer with signal processing in time domain for sugar content determination in aqueous solution is presented. The elaborated measurement set-up was tested with the use of synthesized source made of two low-coherence sources. The use of two sources with dedicated parameters enabled to obtain a proper metrological parameters of the measurement system. The elaborated low-coherence...

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• Review of Diameter protocol implementations for realization of communication in NGN networks

  Publikacja

  • M. Narloch
  • M. Sac

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2011

  In the paper Diameter protocol as well as its applications in the context of Next Generation Network (NGN) are described. Diameter message content and Attribute-Value Pairs (AVPs) concept are presented. Critical review of open source Diameter implementations is carried out. The performed analysis takes into consideration programming language, availability, support and documentation aspects. Basing on the review project fulfilling...

• Analysis of Agricultural and Engineering Systems using Simulation Decomposition

  Publikacja

  • Y. Liu
  • L. Leifsson
  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - Rok 2022

  This paper focuses on the analysis of agricultural and engineering processes using simulation decomposition (SD). SD is a technique that utilizes Monte Carlo simulations and distribution decomposition to visually evaluate the source and the outcome of different portions of data. Here, SD is applied to three distinct processes: a model problem, a nondestructive evaluation testing system, and an agricultural food-water energy system....

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• Implementation of Coprocessor for Integer Multiple Precision Arithmetic on Zynq Ultrascale+ MPSoC

  Publikacja

  • T. Stefański
  • K. Rudnicki
  • W. Żebrowski

  - Rok 2021

  Recently, we have opened the source code of coprocessor for multiple-precision arithmetic (MPA). In this contribution, the implementation and benchmarking results for this MPA coprocessor are presented on modern Zynq Ultrascale+ multiprocessor system on chip, which combines field-programmable gate array with quad-core ARM Cortex-A53 64-bit central processing unit (CPU). In our benchmark, a single coprocessor can be up to 4.5 times...

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• Influence of Shunt Compensation with SVC Devices on Resonance Risk in Power Systems

  Publikacja

  • R. Kowalak
  • R. Małkowski
  • S. Czapp
  • J. Klucznik
  • Z. Lubośny
  • K. Dobrzyński

  - Rok 2015

  Many analyses are required to locate a new reactive power source in a power system. The choice of a location is a very complex matter which requires various aspects to be considered. Selecting a location also entails the necessity to assess it from the point of view of the selected compensator’s structure as well as the system’s performance in various states with the new device on. The paper presents the issues of assessing compensator...

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• RADIATION OF HIGH INTENSITY SOUND BY CIRCULAR DISC BY MEANS OF THE NUMERICAL METHOD

  Publikacja

  • G. Grelowska
  • E. Kozaczka

  - HYDROACOUSTICS - Rok 2014

  The main goal of this paper is to find sound pressure distribution radiated by the circular piezoelectric disc that vibrates with the finite amplitude. There has been presented the pressure distribution close to the radiating surface. Also it is shown the sound pressure distribution in the 3D form. The mathematic modeling was carried out on the base of the nonlinear acoustic equation with the proper boundary condition. The axial...

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• Selfish Attacks in Two-Hop IEEE 802.11 Relay Networks: Impact and Countermeasures

  Publikacja

  • J. Konorski
  • S. Szott

  - IEEE WIRELESS COMMUNICATIONS LETTERS - Rok 2018

  In IEEE 802.11 networks, selfish stations can pursue a better quality of service through selfish MAC-layer attacks. Such attacks are easy to perform, secure routing protocols do not prevent them, and their detection may be complex. Two-hop relay topologies allow a new angle of attack: a selfish relay can tamper with either source traffic, transit traffic, or both. We consider the applicability of selfish attacks and their variants...

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• Multisource model of ship electric field

  Publikacja

  • K. Jakubiuk
  • P. Zimny
  • M. Wołoszyn

  - Computer Applications in Electrical Engineering - Rok 2011

  A steel-hulled ship in sea water produces an electric field around itself. The source of this field are electrochemical processes and ship's cathodic protection. The analysis of the electric field around the ship is important by the reason of the ship's identification and counter-mine protection. The paper presents a simplified model of the ship's multisource electric field, which allows to calculate the electric field distribution...

• Analysis of server-side and client-side Web-GIS data processing methods on the example of JTS and JSTS using open data from OSM and geoportal

  Publikacja

  • M. Kulawiak
  • A. Dawidowicz
  • M. Pacholczyk

  - COMPUTERS & GEOSCIENCES - Rok 2019

  The last decade has seen a rapid evolution of processing, analysis and visualization of freely available geographic data using Open Source Web-GIS. In the beginning, Web-based Geographic Information Systems employed a thick-client approach which required installation of platform-specific browser plugins. Later on, research focus shifted to platform-independent thin client solutions in which data processing and analysis was performed...

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• THE 3D MODEL OF WATER SUPPLY NETWORK WITH APPLICATION OF THE ELEVATION DATA

  Publikacja

  • A. Sobieraj-Żłobińska
  • B. Wieczorek

  - Rok 2017

  3D visualization is a key element of research and analysis and as the source used by experts in various fields e.g.: experts from water and sewage systems. The aim of this study was to visualize in three-dimensional space model of water supply network with relief. The path of technological development of GESUT data (Geodezyjna Ewidencja Sieci Uzbrojenia Terenu – geodetic records of public utilities) for water supply and measurement...

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• Cathodic Protection System of the Spiral Classifier at the KGHM Polska Miedź S.A. Ore Concentration Plant—Case Study of Commissioning and Control of Operating Parameters

  Publikacja

  • M. Czekajło
  • K. Żakowski

  - Minerals - Rok 2022

  The project involved designing, constructing and commissioning a cathodic protection system for a selected spiral classifier operating at the KGHM Polska Miedź S.A. Ore Concentration Plant (O/ZWR). The authors developed a concept and assumptions regarding the corrosion protection of a large industrial device using a cathodic protection system with an external power source. Pre-project studies included conducting a trial polarization...

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• MINERAL CONTENT OF TREE SAP FROM THE SUBCARPATHIAN REGION

  Publikacja

  • M. Bilek
  • K. Stawarczyk
  • M. Gostkowski
  • M. Olszewski
  • K. Kędziora
  • E. Cieślik

  - Journal of Elementology - Rok 2016

  but also as medicinal substance in folk medicine. Traditionally, it was used to treat various conditions, mostly anaemia and chronic fatigue. This study has been designed to establish the content of metallic elements (sodium, potassium, calcium, magnesium, zinc and copper) in sap collected from eight different species (silver birch, downy birch, hornbeam, Norway maple, boxelder maple, black walnut, black alder and white willow)...

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• Spectroscopic and theoretical investigation into substituent- and aggregation-related dual fluorescence effects in the selected 2-amino-1,3,4-thiadiazoles

  Publikacja

  • I. Budziak
  • D. Karcz
  • M. Makowski
  • B. Myśliwa-Kurdziel
  • K. Kasprzak
  • A. Matwijczuk
  • E. Chruściel
  • A. Oniszczuk
  • L. Adwent
  • A. Matwijczuk

  - JOURNAL OF MOLECULAR LIQUIDS - Rok 2019

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• Non-Typical Fluorescence Effects and Biological Activity in Selected 1,3,4-thiadiazole Derivatives: Spectroscopic and Theoretical Studies on Substituent, Molecular Aggregation, and pH Effects

  Publikacja

  • . Budziak
  • . Karcz
  • . Makowski
  • . Rachwał
  • . Starzak
  • . Myśliwa-Kurdziel
  • . Oniszczuk
  • . Combrzyński
  • . Podleśna
  • . Matwijczuk

  - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES - Rok 2019

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• Synthesis, biological activity and molecular modelling studies of tricyclic alkylimidazo-, pyrimido- and diazepinopurinediones

  Publikacja

  • A. Drabczyńska
  • T. Karcz
  • E. Szymańska
  • M. Köse
  • C. Müller
  • M. Paskaleva
  • J. Karolak-Wojciechowska
  • J. Handzlik
  • O. Yuzlenko
  • K. Kieć-Kononowicz

  - Purinergic Signalling - Rok 2013

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• Olfactory Dysfunction in Patients With Relapsing-Remitting Multiple Sclerosis Treated With Disease-Modifying Therapies

  Publikacja

  • M. Wnuk
  • L. Drabik
  • M. Marona
  • J. Szaleniec
  • A. Bryll
  • P. Karcz
  • J. Kolasinska
  • M. Kolasinska
  • M. Ziekiewicz
  • J. Skladzien... i 2 innych

  - ENT-EAR NOSE & THROAT JOURNAL - Rok 2020

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• Dynamic state assessment of the water turbine with the power of 600 kW

  Publikacja

  • G. Żywica
  • P. Bagiński
  • Ł. Breńkacz

  - Diagnostyka - Rok 2013

  The article discusses the results of experimental studies to assess the dynamic state of the turbine set with the Kaplan turbine. The dynamic assessment was made on the basis of appropriate standards, based on the measurement results of selected parameters of vibration, which have been measured for several states of the machine load. In addition, we attempted to identify the causes of the increased vibration levels based on the...

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• The Impact of Micro-Sources on Voltage Distortions in a Power Grid

  Publikacja

  • M. Grzymkowska
  • J. Klucznik

  - Acta Energetica - Rok 2020

  The increase in the number of photovoltaic (PV) systems integrated with low voltage (LV) grids has led to a great need to analyse the impact of these systems on the quality of electricity and the reliability of its supply. This paper presents and compares the energy quality requirements imposed by various countries on photovoltaic plants. Then, based on real object tests and simulation in DIgSILENT PowerFactory, the impact has...

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• Observation value analysis - integral part of Bayesian diagnostics

  Publikacja

  • M. Apollo
  • M. W. Kembłowski

  - Rok 2015

  Detailed subject of the research is to analyse the value of the observation, which is a part of preposterior analysis. For the presented network, the main objective was to determine, conducting of which of three tests is the most valuable from the perspective of determining possible need or possibility to omission expensive technical expertise. The main advantage of preposterior analysis is answering the question which of the considered...

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• The Finite Elements Method application to assesment the impact of turbulence generated by wind turbines on their lacation inclose proximity of overhead high voltage power transmissionlines

  Publikacja

  • W. Kamrat

  - Gaz, Woda i Technika Sanitarna - Rok 2023

  The paper presents selected aspects of construction of wind turbines location concerning aerodynamic impact on power lines. Reaserch is based on the source data concerning the aerodynamic impact of a wind farm consisting of 8 turbines and 400 kV power line, an analysis of the possibility of wind farm locating in the immediate vicinity of the line was carried out. There are serious problems with locating higher capacity wind farms...

• A novel concept of H2/O2 steam generator

  Publikacja

  • G. Marek
  • H. Sławomir
  • J. Cieśliński

  - Rok 2016

  This paper presents an idea of hydrogen utilization to steam generation to drive a turbine and produce electricity or to supply a condenser as an element of a heating system. Electrolysis process is considered as a source of hydrogen as well as oxygen. Hydrogen combustion with a stoichiometric ratio of pure oxygen produces steam at very high temperature. Steam temperature can be controlled by mixing the generated steam with liquid...

• Performance of the PVT solar collector operated with water-Al2O3 nanofluid

  Publikacja

  • J. Cieśliński
  • B. Dawidowicz
  • J. Krzyżak

  - Rok 2016

  An experimental investigation of the hybrid module photovoltaic panel -solar collector (PVT) cooled by water-Al2O3 nanofluids has been conducted. The weight fractions of the nanoparticles were 1% and 3%. Thermal efficiency, power efficiency and overall efficiency have been determined for artificial source of light and sunlight. No noticeable effect of the nanoparticle concentration on the overall efficiency of the PVT module has...

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• PERFORMANCE OF THE PVT SOLAR COLLECTOR OPERATED WITH WATER –AL2O3 NANOFLUID

  Publikacja

  • J. Cieśliński
  • B. Dawidowicz
  • J. Krzyżak

  - Polska Energetyka Słoneczna - Rok 2016

  An experimental investigation of the hybrid module photovoltaic panel -solar collector (PVT) cooled by water-Al2O3 nanofluids has been conducted. The weight fractions of the nanoparticles were 1% and 3%. Thermal efficiency, power efficiency and overall efficiency have been determined for artificial source of light and sunlight. No noticeable effect of the nanoparticle concentration on the overall efficiency of the PVT module has...

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• Rational Use of Primary Energy in Single-Family Residential Houses

  Publikacja

  • D. Ambroziak
  • Ł. Skarbek
  • P. Tojza
  • J. Jaworski
  • D. Gradolewski
  • G. Redlarski

  - Rok 2015

  This work presents results of the primary energy use for heating residential single-family house. Analysis includes domestic hot water system (DHW) and heating, ventilation and air condition system (HVAC). During researches the conventional and alternative energy sources (natural gas, biomass, fuel oil, bituminous coal, lignite or electric energy obtained from electric power system – EPS) were used in DHW and HVAC systems. Furthermore...

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• A NOVEL CONCEPT OF H2/O2 STEAM GENERATOR

  Publikacja

  • M. Gołębiewski
  • S. Halbryt
  • J. Cieśliński

  - Instal - Rok 2016

  This paper presents an idea of hydrogen utilization to steam generation to drive a turbine and produce electricity or to supply a condenser as an element of heating system. Electrolysis process is considered as a source of hydrogen as well as oxygen. Hydrogen combustion with a stoichiometric ratio of pure oxygen produces steam at very high temperature. Steam temperature can be controlled by mixing the generated steam with liquid...