Search results for: METHOD OF CHARACTERISTICS

• Rheological characteristics of oligomeric semiproducts gained via chemical degradation of polyurethane foam using crude glycerin in the presence of different catalysts

  Publication

  • P. Jutrzenka Trzebiatowska
  • J. Datta

  - POLYMER ENGINEERING AND SCIENCE - Year 2017

  Polyurethane (PU) recycling is a topic of growing interest due to the increasing amount of polyurethane waste. The main purpose of polyurethane chemical recycling is to recover the starting polyol. In this study, a method of polyurethane thermochemical recycling, glycerolysis by means of crude glycerin, is proposed. This work presents a comparative study of commercial catalysts used in order to accelerate the decomposition process,...

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• Synthesis, characteristics, and photocatalytic activity of zinc oxide nanoparticles stabilized on the stone surface for degradation of metronidazole from aqueous solution

  Publication

  • A. N. Alibeigi
  • N. Javid
  • M. Amiri Gharaghani
  • Z. Honarmandrad
  • F. Parsaie

  - Environmental Health Engineering and Management Journal - Year 2021

  Abstract Background: The presence of antibiotics such as metronidazole in wastewater even at low concentrations requires searching for a suitable process such as advanced oxidation process (AOP) to reduce the level of pollutants to a standard level in water. Methods: In this study, zinc oxide (ZnO) nanoparticles were synthesized by thermal method using zinc sulfate (ZnSO4) as a precursor, then, stabilized on stone and was used...

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• Fast EM-Driven Nature-Inspired Optimization of Antenna Input Characteristics Using Response Features and Variable-Resolution Simulation Models

  Publication

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - Scientific Reports - Year 2024

  Utilization of optimization technique is a must in the design of contemporary antenna systems. Often, global search methods are necessary, which are associated with high computational costs when conducted at the level of full-wave electromagnetic (EM) models. In this study, we introduce an innovative method for globally optimizing reflection responses of multi-band antennas. Our approach uses surrogates constructed based on response...

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• METHOD OF ROUTING SHIPS SAILING IN DEDICATED ENVIRONMENT

  Publication

  • M. Życzkowski

  - Annual of Navigation - Year 2017

  The method for determining the suboptimal route of sailing vessels operating in a restricted area of the sea are proposed in the paper. The dynamics of the environment including weather conditions and speed characteristics of ships sailing are considered. As optimiza-tion criterion, measure sailing time T, and the number of maneuvers performed ω, are taken into account. An heuristic algorithm, and the appropriate application routing...

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• Polynomial description of dynamic impedance spectrogram—introduction to a new impedance analysis method

  Publication

  • K. Darowicki
  • A. Zieliński
  • M. Mielniczek
  • E. Janicka
  • Ł. Gaweł

  - ELECTROCHEMISTRY COMMUNICATIONS - Year 2021

  This paper presents a polynomial description of spectrograms obtained using Dynamic Electrochemical Impedance Spectroscopy. A method to fit the polynomial degree correctly is discussed. A simple electrical system of a diode connected in parallel with a capacitor was used for testing. Dynamic impedance measurements during potentiodynamic polarization were conducted. This paper presents an alternative analysis method that allows...

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• Investigation method of large-volume tire with mobile test rig

  Publication

  • K. Centkowski

  - Year 2017

  The goal of this research is to develop the tire test method and mobile tire test rig. The test rig enables measurement of tire properties as stiffness and viscous damping in vertical direction, and tire–ground characteristics on the asphalt rigid surface. The tire-ground characteristics are measured by force and a torque measurement hub. The design, calibration and the algorithm for calculating the forces in the wheel center are...

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• Characteristics of the topology of the Internet

  Publication

  • J. Rak

  - Year 2005

  Rozdział dotyczy charakterystyki topologii Internetu. Ukazuje zagrożenia wynikające z bezskalowego charakteru sieci. Opisuje naturę ataku - destrukcyjnego działania mającego na celu wyeliminowanie ważnego elementu sieci. Przedstawia reguły doboru tras, pozwalające ustanawiać ścieżki realizacji połączeń omijające określone węzły sieci, narażone na atak.

• Trolleybus infrastructure characteristics

  Publication

  • M. Bartłomiejczyk

  - Year 2013

  W publikacji przedstawiono nowoczesne rozwiązania infrastruktury trolejbusowej stosowane w krajach Unii Europejskiej

• Trolleybus Fleet Characteristics

  Publication

  • M. Bartłomiejczyk
  • J. Pudło

  - Year 2013

  W pracy przedstawiono nowoczesne rozwiązania taboru trolejbusowego stosowane w Europie

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• Characteristics of the Jerusalem Artichoke

  Publication

  • B. Sawicka
  • P. Pszczółkowski

  - Year 2022

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• Characteristics of Electrorheological Fluids

  Publication

  • Z. Kesy
  • G. Medrek
  • K. Osowski
  • A. Olszak
  • M. Migus
  • I. Musiałek
  • K. Musiałek
  • A. Kesy

  - Year 2022

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• The OptD-multi method in LiDAR processing

  Publication

  • W. Błaszczak-bąk
  • A. Sobieraj-Żłobińska
  • M. Kowalik

  - MEASUREMENT SCIENCE & TECHNOLOGY - Year 2017

  New and constantly developing technology for acquiring spatial data, such as LiDAR (light detection and ranging), is a source for large volume of data. However, such amount of data is not always needed for developing the most popular LiDAR products: digital terrain model (DTM) or digital surface model. Therefore, in many cases, the number of contained points are reduced in the pre-processing stage. The degree of reduction is determined...

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• SSFR Test of Synchronous Machine for Different Saturation Levels using Finite-Element Method

  Publication

  • F. Kutt
  • S. Racewicz
  • M. Michna

  - Year 2014

  In 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...

• Evaluation of organic coatings condition with AFM-based method

  Publication

  • M. Szociński

  - Surface Innovations - Year 2016

  The paper presents an atomic force microscopy (AFM)-based approach to evaluation of local protective properties of organic coatings. Apart from topography, it provides local ac and dc characteristics of examined coating. The method consists in application of ac voltage perturbation signal between conductive AFM tip and coated metal substrate. The resulting current is used to determine local impedance characteristics. Both impedance...

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• Dynamic characteristics of interaperitoneal perfusion.

  Publication

  • J. Sawicki
  • S. Sawicki
  • D. Wydra
  • K. Ciach
  • J. Emerich

  - Acta of Bioengineering and Biomechanics - Year 2003

  Przedstawiono wyniki badań laboratoryjnych perfuzyjnego przepływu przez model jamy brzusznej człowieka. Szczególną uwagę zwrócono na techniczne aspekty modelu oraz wyników badań. Omówiono technikę pomiarową oraz przeanalizowano rezultaty pod kątem teorii przepływów przez zbiorniki i reaktory.

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• Rotordynamic characteristics of a chamber seal

  Publication

  • K. Kosowski
  • W. Włodarski

  - Year 2009

  The paper presents the results of numerical and experimental investigations into pressure forces generated in a turbine labyrinth seal of a modernized type. The experiments were performed on a single-stage air model turbine of the impulse type. The experiments were performed on a single-stage air model turbine of the impulse type. The experimental data were compared with theoretical results obtained by means of CFD Fluent Code....

• Characteristics of the conductivity of polyurethane nanocomposite

  Publication

  • K. Leszkowski
  • M. Strankowski
  • A. Miszczyk
  • J. T. Haponiuk

  - Year 2010

  W opracowaniu tym przedstawiono właściwości mechaniczne oraz przewodnictwo jonowe otrzymanych nanokompozytów poliuretanowych. KOmpozyty te były otrzymane przy wykorzystaniu wytłaczarki dwuślimakowej. POddano je badaniom wytrzymałościowym, spektroskopii impedancyjnej, spektroskopii w podczerwieni oraz badaniom dynamiczno - mechanicznym (DMA)

• Bioterrorism — characteristics and possibilities of prevention

  Publication

  • R. Ambroziak
  • S. J. Ambroziak
  • R. Katulski
  • J. Sadowski
  • J. Stefański
  • E. Lelo

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2016

  In the paper bioterrorist threats have been presented. Historical background and possible methods of attacks have been described. The most dangerous pathogens and disease entities have been classified. Selected methods of detection and identification of biological weapon have been presented. The wireless system for threats monitoring — developed at Gdansk University of Technology — has been described.

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• Third sector characteristics and importance

  Publication

  • M. M. Popowska
  • M. Łuński

  - Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka - Year 2014

  This article aims to present a brief overview of existing definitions and specific characteristics of the third sector. It also highlights the basic functions of NGOs as an important institutional and organizational actor in the global political and economic landscape.

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• Performance Characteristics of a Micro-Turbine

  Publication

  • K. Kosowski
  • W. Włodarski
  • M. Piwowarski
  • R. Stępień

  - Advances in Vibration Engineering - Year 2014

  In the paper a design of a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of particular experimental investigations and numerical calculations are shown, followed by conclusions. The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The values of the main cycle parameters were as follows:heat output:...

• EXPERIMENTAL AND NUMERICAL VALIDATION OF THE IMPROVED VORTEX METHOD APPLIED TO CP745 MARINE PROPELLER MODEL

  Publication

  • P. Król
  • K. Tesch

  - Polish Maritime Research - Year 2018

  The article presents a numerical analysis of the CP745 marine propeller model by means of the improved vortex method and CFD simulations. Both numerical approaches are validated experimentally by comparing with open water characteristics of the propeller. The introduced modification of the vortex method couples the lifting surface approach for the propeller blades and the boundary element method for the hub. What is more, a...

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• TIME-DOMAIN NUMERICAL EVALUATION OF SHIP RESISTANCE AND MOTION IN REGULAR WAVES BY USING THE CFD URANS METHOD

  Publication

  • M. Sadeghi
  • H. Zeraatgar
  • M. H. Ghaemi
  • M. Barjasteh

  - Year 2023

  Taking into account the International Maritime Organisation’s (IMO) strategy to radically reduce the GHG emitted by the shipping industry towards zero emission operation, today's assessment of ship behaviour in waves, its seakeeping characteristics and resistance and their interrelation with fuel consumption and emissions are one of the most attended research subject. There are three methods to conduct this analysis, which are...

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• A Review: Applications of the Spectral Finite Element Method

  Publication

  • M. B. Hafeez
  • M. Krawczuk

  - ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING - Year 2023

  The Spectral Finite Element Technique (SFEM) has Several Applications in the Sciences, Engineering, and Mathematics, which will be Covered in this Review Article. The Spectral Finite Element Method (SFEM) is a Variant of the Traditional Finite Element Method FEM that Makes use of Higher Order Basis Functions (FEM). One of the most Fundamental Numerical Techniques Employed in the Numerical Simulation is the SFEM, which Outperforms...

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• OPTIMALIZATION OF SORBENT FEEDING IN THE DRY METHOD OF FLUE GAS DESULFURIZATION

  Publication

  • P. Kwiatkowski
  • R. Zadrąg

  - Journal of Polish CIMEEAC - Year 2017

  The swiftly developing sea transport contributes to a considerable increase of fuel usage in the international shipping, which results in the escalation of toxic compounds emitted into the atmosphere. It is followed by the constantly heightened requirements limiting those emissions. In the case of sulfur oxide emission, inside of SECA (Sulfur Emission Control Area), the maximum content of sulfur in the shipping fuels used on the...

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• Determination of CWR track's durability characteristics

  Publication

  • Z. Kędra
  • W. Koc
  • A. Wilk

  - Year 2005

  W pracy przedstawiono wyniki badań nad wyznaczaniem sił osiowych w szynie kolejowej z zastosowaniem metody wymuszonych przemieszczeń poprzecznych. Badania przeprowadzone na stacjonarnym stanowisku badawczym wykazały, że siłę podłużną w szynie można znacznie dokładniej określić na podstawie zmiany nie pionowej, lecz poziomej siły poprzecznej. Pozwoliło to właściwie ukierunkować prace nad określaniem sił osiowych w szynach toru...

• The stationarity characteristics of electrochemical current noise

  Publication

  • A. Zieliński
  • J. Smulko
  • A. Krakowiak
  • K. Darowicki

  - ANTI-CORROSION METHODS AND MATERIALS - Year 2002

  Przedstawiono rezultaty analizy szumu elektrochemicznego generowanego podczas korozji stali 0H18N9 w roztworze 0.1 M H2SO4+0,006 M Cl-. Rejestry uzyskano w warunkach potencjostatycznych. W szumie zaobserwowano trendy i sygnały przejściowe, charakterystyczne dla korozji wżerowej. Trend został usunięty za pomocą aproksymacji wielomianem trzeciego stopnia. Analiza statystyczna wykazała niestacjonarny bądź słabo stacjonarny charakter...

• Performance Characteristics of a Micro-turbine, International

  Publication

  • K. Kosowski
  • M. Piwowarski
  • R. Stępień
  • W. Włodarski

  - Year 2012

  . In the paper a design of a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of particular experimental investigations and numerical calculations are shown, followed by conclusions. The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The values of the main cycle parameters were as follows:- heat...

• The influence of magnetic core on frequency characteristics

  Publication

  • T. Daszczynski
  • Z. Pochanke

  - Year 2016

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• The modyfication of the dynamic characteristics of vibratory conveyor

  Publication

  • T. Kucharski
  • P. Jakubowski

  - Year 2006

  The vibratory conveyors are used in the industry for continuous transportation of loose substances on distance up to 20meters. These conveyors are often suspended on expensive and massive frames, which are softly vibroisolated from the ground. As a result, they transfer significant dynamic forces on the ground. In case of 5 - 20 meter-long devices, the biggest construction problems are proper vibrations of the panel caused by bilateral...

• Testing of the Superconducting Magnets Frequency Characteristics

  Publication

  • D. Świsulski
  • M. Wołoszyk
  • M. Wołoszyn
  • M. Ziółko
  • L. Rafiński
  • A. Stafiniak

  - Elektronika Ir Elektrotechnika - Year 2010

  Przedstawiono zagadnienia związane z opracowaniem systemu do wyznaczania impedancji uzwojeń magnesów nadprzewodzących w funkcji częstotliwości. Omówiono strukturę sprzętową systemu, oprogramowanie oraz sposób wyznaczania parametrów badanego uzwojenia. Pokazano przykładowe wyniki uzyskane przy użyciu omawianego systemu w GSI w Darmstadt.

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• UNDECLARED WORK IN POLAND CHARACTERISTICS AND PREVALENCE

  Publication

  • D. Nikulin

  - Ekonomika - Year 2016

  This article aims to present the significance and prevalence of the phenomenon of undeclared work. First, we discuss the definitional issues of this phenomenon. Then, we present previous estimates on shadow economy and undeclared work in Poland, based on statistics provided by Central Statistical Office and other research entities. Our analysis covers the years 2000–2014. In the last part of the article, we use data from the Labour...

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• SUBSOIL CHARACTERISTICS OF THE VISTULA RIVER DIKES

  Publication

  • L. Bałachowski
  • Z. Sikora

  - Year 2014

  The results of CPTU tests are used to determine the strength parameters of a dike subsoil. Stress state and stress history of the subsoil under the flood embankment was evaluated with CPTU and DMT tests. Normally consolidated soil was found under the central part of the dike, while the subsoil near the dike toe is found to be overconsolidated. Due to consolidation the undrained shear strength of the subsoil under the central part...

• FIR Filter Design Using Distributed Maximal Flatness Method

  Publication

  • M. Blok

  - International Journal of Electronics and Telecommunications - Year 2013

  In the paper a novel method for filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the method used to design the most common FIR fractional delay filter - the maximally flat filter. The MF filter demonstrates excellent performance but only in a relatively narrow frequency range around zero frequency but its magnitude response is no greater than one. This ,,passiveness”...

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• OPTIMIZATION OF THE LAST STAGE OF GAS-STEAM TURBINE USING A HYBRID METHOD

  Publication

  • P. Ziółkowski
  • Ł. Witanowski
  • P. Klonowicz
  • S. Głuch

  - Year 2021

  This paper relates to the CFD calculation of a new turbine type which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in wet combustion chamber. At first, this article concentrates on a possibility of streamlining the flow efficiency of a last stage of axial turbine working on gas-steam mixture using a hybrid of the particle swarm optimization algorithm with the Nelder-Mead...

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• Grape vinegars – characteristics, properties and safety of use

  Publication

  • J. Antoniewicz
  • K. Janda-

  - Medycyna Ogólna i Nauki o Zdrowiu - Year 2021

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• Characteristics and structure of starch isolated from triticale

  Publication

  • A. Makowska
  • A. Szwengiel
  • P. Kubiak
  • J. Tomaszewska‐Gras

  - Starch - Stärke - Year 2014

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• Strength characteristics of tyre chips-sand mixtures.

  Publication

  • P. Gotteland
  • S. Lambert
  • L. Bałachowski

  - Year 2005

  Badania w aparacie trójosiowego ściskania przy różnej zawartości wagowej kawałków zużytych opon oraz różnym ich ułożeniu w próbce piasku. Badania prowadzono przy dowolnym ułożeniu tych elementów, umieszczeniu ich poziomo oraz w systemie mieszanym. Wyznaczono optymalną zawartość kawałków opon w próbce piasku, przy której występowała maksymalna wytrzymałość na ściskanie.

• On the joint time-frequency characteristics of chemical oscillations

  Publication

  • K. Darowicki
  • W. Felisiak

  - JOURNAL OF COMPUTATIONAL CHEMISTRY - Year 2006

  Zaprezentowano rezultaty analizy czasowo-częstotliwościowej rejestrów potencjałowych oscylacyjnej reakcji Biełousowa-Żabotyńskiego (BŻ). Wybraną reprezentację czasowo-częstotliwościową w postaci algorytmu STFT zastosowano do analizy typowych przebiegów reakcji BŻ, prowadzonej w układzie zamkniętym. Zaprezentowano spektrogramy STFT ukazujące czasowo-częstotliwościową strukturę oscylacji regularnych, mieszanych i chaotycznych. Na...

• Upwelling characteristics in the Puck Bay (the Baltic Sea)

  Publication

  • J. Nowacki
  • M. Matciak
  • M. Szymelfenig
  • M. Kowalewski

  - OCEANOLOGICAL AND HYDROBIOLOGICAL STUDIES - Year 2009

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• Injury characteristics in women in relation to their menopausal status

  Publication

  • D. Timler
  • K. Bogusiak
  • A. Kasielska-Trojan
  • M. Madziała
  • Ł. Szarpak
  • M. Andrzej Madziała

  - Przegląd Menopauzalny - Year 2013

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• Impact of ultrasounds on physicochemical characteristics of potato tubers

  Publication

  • B. Sawicka
  • P. PSZCZÓŁKOWSKI
  • H. DANILČENKO
  • E. JARIENE

  - Agronomy Science - Year 2020

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• Light box for investigation of characteristics of optoelectronics detectors

  Publication

  • A. Szreder
  • A. Mazikowski

  - Year 2017

  In this paper, a light box for investigation of characteristics of optoelectronic detectors is described. The light box consists of an illumination device, an optical power sensor and a mechanical enclosure. The illumination device is based on four types of high-power light emitting diodes (LED): white light, red, green and blue. The illumination level can be varied for each LED independently by the driver and is measured by optical...

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• Characteristics and biochemical composition of kombucha – fermented tea

  Publication

  • K. Jakubczyk
  • G. Piotrowska
  • K. Janda
  • K. Janda-Milczarek

  - Medycyna Ogólna i Nauki o Zdrowiu - Year 2020

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• Synthesis and electrochemical characteristics of novel dithiocarbamate polymers

  Publication

  • M. Lieder

  - JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS - Year 2008

  Novel dithiocarbamate compounds have been obtained by reacting a linear poly(ethylenimine)polymer, MW 50,000, with CS2. The resulting anionic polymers contain, depending on the reaction conditions, up to two sulfur atoms per one nitrogen atom (approx. 40% w/w). The polymers are soluble in dimethylsulfoxide and insoluble in acetonitrile solutions. In both solvents they are electrochemically active, in the latter case as a cast film...

• Frequency characteristics of induction machine speed observers

  Publication

  • E. Bogalecka
  • P. D. Kołodziejek

  - Year 2008

  Właściwości napędu bezczujnikowego z silnikiem indukcyjnym zależą od struktury obserwatora prędkości. System ten wymaga starannej analizy w przypadku uszkodzenia maszyny, której celem jest odpowiedź na pytania: jak układ regulacji pracuje przy niesymetrii maszyny spowodowanej np. uszkodzeniem klatki wirnika oraz jak obserwator odtwarza pulsacje prędkości spowodowane niesymetrią maszyny. W artykule przedstawiono charakterystyki...

• Influence of salinity on the consistency and swelling characteristics of bentonite

  Publication

  • A. Kreft
  • Z. Sikora
  • D. C. Wijesekera

  - Year 2009

  Raport z badań eksperymentalnych odnośnie konsystencji bentonitu (wskaźniki plastyczności, stopień plastyczności) i zjawiska pęcznienia (ciśnienie pęcznienia) przedstawiono w zależności od różnych poziomów zasolenia wody.

• Cardiovascular variability characteristics in obstructive sleep apnea

  Publication

  • K. Narkiewicz
  • V. Somers

  - AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL - Year 2001

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• The influence of contact geometry on friction and wear characteristics

  Publication

  • R. Michalczewski
  • W. Piekoszewski
  • M. Szczerek
  • M. Wiśniewski
  • R. Michalczewski

  - Tribotest - Year 2000

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• Optimization of the Vibrating Machines with Adjustable Frequency Characteristics

  Publication

  • V. Gursky
  • P. Krot
  • I. Dilay
  • R. Zimroz

  - Year 2022

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• The Impact of Migrations on the Spatial Characteristics of the City of Gdańsk

  Publication

  • J. Szczepański
  • L. Nyka

  - Year 2017