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Wyszukujesz frazę "Czyż, S." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Analysis method of fire hazard of fuel oil and diesel oil systems in sea vessels engine rooms
Autorzy:
Charchalis, A.
Czyż, S.
Powiązania:
https://bibliotekanauki.pl/articles/247134.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fire hazard
safety of sea vessel
safety of vessels engine rooms
Opis:
This paper presents theoretical model for fire hazard analysis in fuel oil and diesel oil systems in engine rooms. The model is based on the probabilistic calculus and covers a 'fire tree' and formulas to calculate fire frequencies. Preliminary assumptions and initial frequencies calculation parameters have been adopted on the basis of statistical data. Fire sources identification involves selection of definite number of system elements, the damages of which may result in flammable liquid leakage and self-ignition. Such elements as, inter alia, pipelines joints and sections, valves and system equipment, are taken into consideration. With the use of the model, it is possible to calculate individual fire frequencies for individual self-ignition sources, and synthetic risk in systems and specific rooms. The calculations account for a possibility of introducing construction changes of safety equipment that influence the risk, e.g. number of detectors, fire extinguishing nozzles (fire extinguishers), leakage protection, etc. The method can be used to analyze the influence of fire construction protection on the risk (so-called 'risk sensitivity' testing) in the phase of creating requirements. However, for its quantitative verification statistical data concerning engine rooms fire hazard is essential. It may be assumed that creating an adequate calculation model for the purpose of a general fire hazard analysis of an engine room (of a vessel) is a significantly bigger challenge.
Źródło:
Journal of KONES; 2011, 18, 2; 57-62
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of fire hazard and safety requirements of a sea vessel engine rooms
Autorzy:
Charchalis, A.
Czyż, S.
Powiązania:
https://bibliotekanauki.pl/articles/247139.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
analysis of fire hazard
safety of sea vessel
Opis:
This paper presents the results of research on fire hazard coordinated by the Fire Safety Subcommittee of the International Maritime Organization (IMO). On the basis of statistical data, it identifies the main sources and frequency of fires in engine rooms. It also presents calculations of frequency of fires caused by self-ignition of flammable liquids in fuel oil and diesel oil systems, which constitute 60% of the overall hazard. In the theoretical analysis (frequency calculation), changes in construction protection of systems as well as changes in safety equipment of adequate rooms, have been taken into consideration. Fire hazard identification has been conducted on the basis of statistical data of 73 fires of merchant vessels engine rooms out of the overall number of 6,000 vessels in the 13-year-long period of use. As the final result of the research, fire prevention requirements for engine rooms and pumping stations have been developed. The requirements include, in particular: construction elements of systems preventing leakages with self-ignition, protection of ignition sources ('hot spots'), and ensuring safe engine room atmosphere. The results of the experiment have confirmed the possibility of conducting fire hazard quantitative assessment (estimation), the reliability of which is limited because of the nature of the model. As far as quality is concerned, results of risk sensitivity analysis confirm the effects expected when using safety requirements applied creatively.
Źródło:
Journal of KONES; 2011, 18, 2; 49-56
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of maritime evacuation models
Analiza mikroskopowych (rozwiniętych) modeli symulacyjnych procesu ewakuacji statków
Autorzy:
Łozowicka, D.
Czyż, S.
Powiązania:
https://bibliotekanauki.pl/articles/256110.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
ewakuacja
modelowanie
czynnik ludzki
statek pasażerski
evacuation
computer simulation
passengers ship
modelling
human behaviour
Opis:
Evacuation performance is dependent on many parameters including the following: the physical nature of the enclosure, the function of the enclosure, the nature of the population and the nature of the environment. For the purpose of calculating the evacuation time, two approaches can be used for evacuation analysis: macroscopic (simplified) models and microscopic (advanced) models. In a simplified model, the flow of persons is described like a fluid and the escape routes are schematised as a hydraulic network. The essential aspect of a microscopic model is a detailed description, the flow consist of many individual entities that interact with each other. The microscopic model may provide greater accuracy in the prediction of the evacuation time. Quantitative validation of advanced models poses a number of challenges, the most significant being a shortage of suitable experimental data.
Przebieg ewakuacji zależy od wielu parametrów, do których należą: geometria i przeznaczenie pomieszczeń, cechy populacji osób oraz warunki środowiskowe. W celu obliczania czasu ewakuacji do analizy tego procesu stosuje się dwa modele: makroskopowy (uproszczony) i mikroskopowy (rozwinięty). W modelu uproszczonym osoby traktowane są jako płynne medium, a trasa ewakuacji jako rurociągi. Model mikroskopowy może zapewnić większą dokładność predykcji czasu ewakuacji.
Źródło:
Problemy Eksploatacji; 2008, 1; 189-196
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of the continuously rotating detonation combustion chamber supplied with different types of fuel
Autorzy:
Łukasik, B.
Czyż, S.
Irzycki, A.
Rowiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/246684.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
rotating detonation
air/Jet-A detonation
detonation combustion chamber
internal combustion engine
Opis:
The paper summarizes research that was conducted last year as part of the project of “Turbine engine with detonation combustion chamber”. In this project, throughout 2012 and early 2013, tests were carried out on a test stand connected to the compressed air system. Research, of the rotating detonation phenomena, was carried out for a number of detonation chambers with different interior channel geometry. In addition, for each geometry configuration, tests were carried out for different levels of choking of the chamber outlet and hence for different pressures conditions inside the detonation chamber. This article presents the results of tests carried out for gaseous (hydrogen), hybrid (hydrogen + kerosene) and liquid (Jet-A) fuels, using different types of fuel injectors and for different fuel injection configuration settings (inside the chamber, or in front of the chamber). During these tests, parameters such as pressure behind the detonation wave (using piezoelectric sensors), the static pressure in front of and inside the detonation chamber and temperature: before, inside and at the outlet of the chamber, were measured. Research was performed for the various mass flow rates of air and fuel injected into the chamber that means for the different air-fuel equivalence ratios (Lambda). The main achievement of this study was to obtain a stable and reproducible rotating detonation of air and heated kerosene (Jet-A) mixture, thus the results presented in this paper presents mainly these tests as the most interesting to the reader
Źródło:
Journal of KONES; 2013, 20, 3; 259-266
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutral and Charged Excitons Localized in the InAs/GaAs Wetting Layer
Autorzy:
Babiński, A.
Czyż, M.
Golnik, A.
Borysiuk, J.
Kret, S.
Raymond, S.
Lapointe, J.
Wasilewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1811914.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
78.55.Cr
78.67.Hc
Opis:
It has recently been shown that potential fluctuations in a wetting layer, which accompanies InAs/GaAs quantum dots can localize excitons. Neutral excitons and biexcitons and charged excitons were identified. In this communication we report on studies of properties of the excitons over wide temperature range (T < 70 K). The micro-photoluminescence measurements enable investigation of excitons localized in a single potential fluctuation. Temperature-induced broadening of the neutral exciton as well as a quenching of the charged exciton at temperatures higher than 50 K are observed and discussed.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1055-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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