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Wyświetlanie 1-15 z 27
Tytuł:
Real-time connection between immerse 3D visualization laboratory and KASKADA platform
Autorzy:
Wiszniewski, Ł.
Ziółkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1941641.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
multimedia
cluster computing
visualization laboratory
data transmission
Opis:
Multimedia stream processing into two cooperative different systems (cluster platform and virtual lab) is considered. The considered selected information about the system is presented and the idea of its communication when executing the distributed application is proposed. A general schema of the communication architecture is given. Tests of data transmission quality are considered and their results are presented.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 4; 471-480
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A parallel genetic algorithm for creating virtual portraits of historical figures
Autorzy:
Krawczyk, H.
Proficz, J.
Ziółkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1933983.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska
Tematy:
genetic algorithms
fitness function
KASKADA platform
parallel processing
high performance computing
Opis:
In this paper we present a genetic algorithm (GA) for creating hypothetical virtual portraits of historical figures and other individuals whose facial appearance is unknown. Our algorithm uses existing portraits of random people from a specific historical period and social background to evolve a set of face images potentially resembling the person whose image is to be found. We then use portraits of the person’s relatives to judge which of the evolved images are most likely to resemble his/her actual appearance. Unlike typical GAs, our algorithm uses a new supervised form of fitness function which itself is affected by the evolution process. Additional description of requested facial features can be provided to further influence the final solution (i.e. the virtual portrait). We present an example of a virtual portrait created by our algorithm. Finally, the performance of a parallel implementation developed for the KASKADA platform is presented and evaluated.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 1-2; 145-162
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Project-factor-decision” decisive factors in it projects and their impact on its success
Autorzy:
Sitek, T.
Ziółkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/94877.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
IT project management
decision-making processes
organization maturity
zarządzanie projektami IT
proces podejmowania decyzji
dojrzałość organizacji
Opis:
The aim of this article is to indicate the need for a deepening, systematizing and codifying of the theoretical and practical knowledge on IT project management, in the area of management decision-making processes. The scope of decisions made by managers is constantly on the increase. Project managers make decisions not only within the classic triangle of constraints, which consists of a schedule, a budget and the project scope, but also in reference to a number of other problems which occur during project execution. The observed need to identify and define all the factors which are present in projects results in the identification of a finite set of variables for decision-making and for the decisions themselves and, finally, in determining their mutual correlation.
Źródło:
Information Systems in Management; 2014, 3, 2; 145-155
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of possible application of high-temperature nuclear reactors to contemporary large-output steam power plants on ships
Autorzy:
Kowalczyk, T.
Głuch, J.
Ziółkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/258948.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship power plants
steam turbines
nuclear reactors
PWR
HTR
variable operational conditions
Opis:
This paper is aimed at analysis of possible application of helium to cooling high-temperature nuclear reactor to be used for generating steam in contemporary ship steam-turbine power plants of a large output with taking into account in particular variable operational parameters. In the first part of the paper types of contemporary ship power plants are presented. Features of today applied PWR reactors and proposed HTR reactors are discussed. Next, issues of load variability of the ship nuclear power plants , features of the proposed thermal cycles and results of their thermodynamic calculations in variable operational conditions, are presented.
Źródło:
Polish Maritime Research; 2016, 2; 32-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exergy analysis of the Szewalski cycle with a waste heat recovery system
Autorzy:
Kowalczyk, T.
Ziółkowski, P.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/240278.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Szewalski cycle
binary vapour cycle
exergy analysis
waste heat
idea Szewalskiego
analiza egzergii
ciepło odpadowe
Opis:
The conversion of a waste heat energy to electricity is now becoming one of the key points to improve the energy efficiency in a process engineering. However, large losses of a low-temperature thermal energy are also present in power engineering. One of such sources of waste heat in power plants are exhaust gases at the outlet of boilers. Through usage of a waste heat regeneration system it is possible to attain a heat rate of approximately 200 MWth, under about 90°C, for a supercritical power block of 900 MWel fuelled by a lignite. In the article, we propose to use the waste heat to improve thermal efficiency of the Szewalski binary vapour cycle. The Szewalski binary vapour cycle provides steam as the working fluid in a high temperature part of the cycle, while another fluid – organic working fluid – as the working substance substituting conventional steam over the temperature range represented by the low pressure steam expansion. In order to define in detail the efficiency of energy conversion at various stages of the proposed cycle the exergy analysis was performed. The steam cycle for reference conditions, the Szewalski binary vapour cycle as well as the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery have been comprised.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 25-48
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical cycles in the modern power system – exergy analysis under partial loads
Autorzy:
Kowalczyk, T.
Ziółkowski, P.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/175484.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hierarchical cycles
partial loads
combine cycles
Opis:
The aim of this paper is to investigate thermodynamic efficiency of hierarchical thermodynamic cycles under partial loads by using of exergy analysis. Advanced hierarchical cycles are composed of few energy conversion systems, which can be powered by several different sources of energy jointly. This kind of cooperation gives opportunities to provide high efficient and clean conversion of fossil fuels to electricity. Moreover, power plant consisting of few traditional power system gives new possibilities of optimization under partial loads.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 3-23
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pharmacokinetics of orally administered simvastatin in turkeys
Autorzy:
Jasiecka, A.
Grabowski, T.
Maslanka, T.
Ziolkowski, H.
Jaroszewski, J.J.
Powiązania:
https://bibliotekanauki.pl/articles/31365.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the present study was to determine the pharmacokinetics of simvastatin (SIM) administered orally in 6-week-old turkeys at a single dose of 2 mg/kg b.w. The SIM concentrations in plasma were determined by validated HPLC-MS/MS method. Mean (± SD; n = 10) values of pharmacokinetic parameters evaluated were as follows: Cmax = 0.49 ± 0.21 ng/ml, tmax = 1.6 ± 1.1 h, AUC(0-∞) = 1.08 ± 0.57 h×ng/ml, t1/2kel = 2.14 ± 1.3 h and MRT = 3.08 ± 1.52 h. The results indicate that the SIM is absorbed from the gastrointestinal tract of turkeys; however, achieved plasma level is lower compared to those observed in mammals.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery
Autorzy:
Ziółkowski, P.
Kowalczyk, T.
Hernet, J.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/175466.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
binary cycle
waste heat
ORC
thermodynamical analysis
numerical
analysis
CFM (computational flow mechanics)
Opis:
In this paper, thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery from exhaust gases are presented. According to that purpose, the CFM (computation flow mechanics) approach has been used correctly. In this paper, traditional steam cycle, the bottoming organic Rankine cycle (ORC) and a system of waste heat recovery with use of water with temperature 90 ◦C have been analyzed. The Szewalski binary vapour cycle is providing steam as the working fluid in the high temperature part of the cycle, while another fluid – organic working fluid – as the working substance substituting conventional steam over the temperature range represented by the low pressure steam expansion. The steam cycle for reference conditions, the Szewalski binary vapour cycle, and the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery have been comprised. Four working fluids in the low temperature part of binary cycle such as ammonia, propane, isobutene and ethanol have also been investigated. Moreover, the Szewalski cycle is a good resolution for proper using heat flux received from the exhaust gases heat regeneration system.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 51-75
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hard water may increase the inhibitory effect of feed on the oral bioavailability of oxytetracycline in broiler chickens
Autorzy:
Ziółkowski, H.
Madej-Śmiechowska, H.
Grabowski, T.
Jaroszewski, J.J.
Maślanka, T.
Powiązania:
https://bibliotekanauki.pl/articles/2087530.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
oxytetracycline
pharmacokinetics
broilers
feed
hard water
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 251-258
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of the Explosion Strike Factors of a Thermobaric Warhead
Badanie czynników rażenia wybuchu głowicy termobarycznej
Autorzy:
Długołęcki, A.
Faryński, A.
Klemba, T.
Słonkiewicz, Ł.
Ziółkowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/403963.pdf
Data publikacji:
2017
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanics
thermobaric explosion
shock wave
shock wave velocity
pressure pulse
mechanika
wybuch termobaryczny
fala uderzeniowa
prędkość fali uderzeniowej
impuls ciśnienia
Opis:
This paper presents the measurement method and results applicable to the pressure pulses and thermal effects generated by an explosion of an unguided thermobaric rocket missile warhead. The determination results include the shock wave pressure and velocity, the TNT equivalents of the thermobaric warheads, and the personnel strike radii of the shock wave. An estimation of the temperature increase rates at the shock wave front was also undertaken.
W artykule przedstawiono metodę i wyniki pomiarów impulsów ciśnienia i efektów termicznych generowanych przez wybuch głowicy termobarycznej rakiety niekierowanej. Wyznaczono ciśnienia i prędkości fal uderzeniowych, równoważniki trotylowe detonowanych głowic oraz promienie rażenia siły żywej przez falę uderzeniową, oszacowano przyrosty temperatury na froncie fali uderzeniowej.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2017, 8, 1 (27); 39-54
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of CD4plusCD8plus double positive T cells in a mouse model of allergic asthma
Autorzy:
Zuska-Prot, M.
Ziolkowski, H.
Jaroszewski, J.J.
Maslanka, T.
Powiązania:
https://bibliotekanauki.pl/articles/32502.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The present study describes the distribution of CD4+CD8+ double-positive (DP) T cells in various immune compartments of mice with ovalbumin (OVA)-induced allergic asthma. It was found that the absolute number of DP T cells was considerably increased in the mediastinal lymph nodes and lungs of asthmatic mice as compared with that determined in the healthy subjects. On the contrary, the absolute counts of DP T cells was significantly decreased in the head and neck lymph nodes, and in peripheral blood of OVA-immunized mice. These results suggest that DP T cells may be involved in the pathogenesis of allergic asthma.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced energy conversion as a result of fluid-solid interaction in micro- and nanoscale
Autorzy:
Badur, J.
Ziółkowski, P.
Kornet, S.
Kowalczyk, T.
Banaś, K.
Bryk, M.
Ziółkowski, P. J.
Stajnke, M.
Powiązania:
https://bibliotekanauki.pl/articles/281383.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
enhanced energy conversion
micro- and nanomechanics
fluid-solid interaction
pressure and thermally driven flow
Opis:
It is known that nano- and micromechanics require new approaches to right describing of surface-like phenomena which lead to an enhanced energy conversion. In this work, a general form of surface forces that consist of a contribution from both the friction and mobility components has been extended to collect the effects of bulk and surface motion of a fluid. Quite similar impact can be observed for a solid-fluid mixture, where the principle of effective stress for this new type of approach should be considered from the very beginning. The second motivation of our work is to present the multiscale domain of fluid-solid interaction which describes some “emergence effects” for materials with especially high volumetric surface densities.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 329-332
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of thermal unit elasticity under the conditions of dynamic RES development
Problem elastyczności bloków cieplnych w warunkach dynamicznego rozwoju OZE
Autorzy:
Kowalczyk, T.
Badur, J.
Ziółkowski, P.
Kornet, S.
Banaś, K.
Ziółkowski, P. J.
Stajnke, M.
Bryk, M.
Powiązania:
https://bibliotekanauki.pl/articles/397195.pdf
Data publikacji:
2017
Wydawca:
ENERGA
Tematy:
energy storage
operational flexibility
steam turbine
gas turbine
SOEC
hydrogen technologies
machine monitoring
magazyn energii
elastyczność pracy
turbina parowa
turbina gazowa
technologie wodorowe
monitoring maszyn
Opis:
The paper is an overview of selected ways of increasing the operational flexibility of steam units, which are predominant in the Polish power system. These studies were prompted by the dynamic changes in the structures of installed capacity and generation output in the National Power System due to a rapid increase in the number of wind turbines in the country. The methods of thermal unit operational flexibility improvement are divided into two groups. The first group comprises solutions with heat and mass storage as well as chemical energy storage. These are solutions to manage the auxiliary load of units regardless of system load. The second group consists of methods for an off-design increase in the safe level of thermal energy machine design stress. The development of numerical tools using complex methods of thermal stress determination, such as Burzyński-Pęcherski’s theory, combined with advanced on-line machine diagnostics, allows for an extension in the operational range of a machine, beyond the original safe operation limit without risk of damage or loss of service life, in other words.
W pracy przedstawiono przegląd wybranych sposobów zwiększania elastyczności pracy bloków parowych, które stanowią największą siłę wytwórczą w polskim systemie elektroenergetycznym. Motywacją do podjęcia prac w tym kierunku są dynamiczne zmiany w strukturze mocy zainstalowanej i energii wytwarzanej w Krajowym Systemie Elektroenergetycznym związane z szybkim wzrostem liczby siłowni wiatrowych na terenie kraju. Metody poprawy elastyczności pracy bloków cieplnych podzielono na dwie grupy. Pierwszą grupę stanowią rozwiązania wykorzystujące magazyny ciepła i masy oraz magazyny energii chemicznej. Są to rozwiązania pozwalające kształtować obciążenie potrzeb własnych bloku niezależnie od obciążenia systemu. Drugą grupę stanowią metody pozwalające na pozaprojektowe wytężanie konstrukcji maszyn cieplnych. Rozwój narzędzi numerycznych wykorzystujących złożone metody wyznaczania naprężeń cieplnych, takie jak np. teoria Burzyńskiego–Pęcherskiego, w połączeniu z zaawansowanymi systemami diagnostyki maszyn online, umożliwiają wychodzenie z pracą maszyn poza granice tzw. bezpiecznej pracy bez ryzyka uszkodzeń lub utraty żywotności.
Źródło:
Acta Energetica; 2017, 2; 116-121
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of zero-dimensional model of SOFC with internal fuel reforming for complex hybrid energy cycles
Autorzy:
Badur, J.
Lemański, M.
Kowalczyk, T.
Ziółkowski, P.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/184970.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuel cell
SOFC
mathematical model
experiment
verification
ogniwo paliwowe
model matematyczny
eksperyment
weryfikacja
Opis:
The article presents a zero-dimensional mathematical model of a tubular fuel cell and its verification on four experiments. Despite the fact that fuel cells are still rarely used in commercial applications, their use has become increasingly more common. Computational Flow Mechanics codes allow to predict basic parameters of a cell such as current, voltage, combustion composition, exhaust temperature, etc. Precise models are particularly important for a complex energy system, where fuel cells cooperate with gas, gas-steam cycles or ORCs and their thermodynamic parameters affect those systems. The proposed model employs extended Nernst equation to determine the fuel cell voltage and steadystate shifting reaction equilibrium to calculate the exhaust composition. Additionally, the reaction of methane reforming and the electrochemical reaction of hydrogen and oxygen have been implemented into the model. The numerical simulation results were compared with available experiment results and the differences, with the exception of the Tomlin experiment, are below 5%. It has been proven that the increase in current density lowers the electrical efficiency of SOFCs, hence fuel cells typically work at low current density, with a corresponding efficiency of 45–50% and with a low emission level (zero emissions in case of hydrogen combustion).
Źródło:
Chemical and Process Engineering; 2018, 39, 1; 113--128
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A role of the heat and work uncompensated transformations in the balance of entropy and the turbomachinery efficienc
Autorzy:
Kowalczyk, T.
Ziółkowski, P.
Sławiński, D.
Cisak, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175450.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy balance
entropy sources
uncompensated transformations
isentropic efficiency
polytropic efficiency
eulerian fluid
turbine stage
Puzyrewski number
Opis:
The notion of heat uncompensated transformation has early been introduced by Clausius in 1854 and next, after fifty years of forgetting, in 1904 Duhem has revalorized it and combined it with a new notion of work uncompensated transformation [3]. In this way the so-called ClausiusDuhem inequality has been established. In our paper we wish to present a novelized procedure of estimating the role of the uncompensated transformations of heat and work within the flow of viscous and heat conducting working fluid like water stream. The original procedure was introduced by Puzyrewski and it is essential in expressing of a local, in time and space, balance of entropy. Futhermore, this unique approach leads to redefinition of the efficiency notion, as is usually applied to fluid-flow machineries, to a new one important in computational fluid dynamics (CFD) three-dimensional modeling. As a result, it is shown that usage of the polytropic efficiency, instead of the isentropic efficiency, is more convenient and seems to be natural in CFD approach. Helpfully, we have also found a correlation between those two efficiency definitions with usage of proposed new dimensionless (criterion) number.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 11-27
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
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