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Wyświetlanie 1-10 z 688
Tytuł:
Testing of the synchronous fluorescence in application to used lubricate oil characterisation
Autorzy:
Baszanowska, E.
Otremba, Z.
Tematy:
marine fleet exploitation
lubricate oil
fluorescence spectroscopy
synchronous fluorescence spectra
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/243560.pdf  Link otwiera się w nowym oknie
Opis:
Reliability of the ship propulsion system depends, inter alia, on the quality of lubricate oils. Research indicates that exploitive features of oil are reduced with it runtime in the ship engine circuit. At the present the basic parameters representing exploitive features of oil are: water content, total acid number and total base number or viscosity vs. temperature, anti-wear performance, further: content of additives and their concentrations, reaction products, and other contaminating substances, also magnetically separated large ferromagnetic particles, the size, the shape, the composition and concentration of the abnormal wear particles. Additional properties of oil are described based on atomic emission spectroscopy, granulometry of separated from the lubricant sample by magnets and gravity, permeability changes, as well as rheometric and tribometric characteristics. Complexity of composition of lubricate oil raises the idea to use changes of relative content of any compounds for characterization of oil exploitive features. Fluorescence method is possible to use for oil properties characterisation due to the presence mono and polycyclic compounds in oil that induces fluorescence phenomenon. Therefore identification the fluorescence spectra when exploitation time of oil increases could be novel indicator to monitor of lubricate oil exploitive quality. In this study we present changes of oil fluorescence expressed by synchronous spectra, taking into account working time of exemplary lubricate oil in the ship engine.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic methods in application to oil pollution detection in the sea
Autorzy:
Baszanowska, E.
Otremba, Z.
Tematy:
marine transport
oil pollution
spectroscopic methods
fluorescence
time-resolved fluorescence
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/248141.pdf  Link otwiera się w nowym oknie
Opis:
The escalating maritime transport as well as offshore crude oil exploitation and pipeline transportation leads to the increase of feasibility of the discharge of petroleum substances to the sea environment events. Therefore, it is necessary to rapidly detect of oil pollution to minimize the extent of contamination in the seawater. The aim of this study is to discuss the assumptions of the optical methods using for detection of oil pollution in the seawater. We consider the different approaches of oil-in-water detection using spectral active and passive techniques with emphasis on fluorescence techniques. The intensive development of scientific apparatus and methods in light spectroscopy leads to build various airborne or underwater specialized devices (UV-, IR-scanners, fluorosensors), which allows to detect oil pollution in relatively large areas of the sea. The possibility of measurements of oil pollution in the seawater is particularly important for monitoring, especially in very difficult weather conditions and highly waved sea surface. Such possibilities should be given by devices for in-situ measurements based on time-resolved fluorescence. Such measurements allow obtaining the significant information about presence of oil in really short time. As we show in this study, the wide-range development of fluorescence techniques opens the diagnostic opportunity not only for detection of the oil-in-water content but also for identification the type of oil directly in seawater or even determination of the source of oil pollution.
Dostawca treści:
Biblioteka Nauki
Artykuł
Autorzy:
Zivcak, Marek
Calatayud, Angeles
Schansker, Gert
Brestic, Marian
Pancaldi, Simonetta
Bussotti, Filippo
Yanniccari, Marcos
Rusinowski, Szymon
Suresh, Kancherla
Bąba, Wojciech
Penella, Consuelo
Pollastrini, Martina
Li, Pengmin
Nebauer, Sergio G.
Cetner, Magdalena D.
Shelonzek, Henry
Losciale, Pasquale
Mishra, Vinod K.
Guidi, Lucia
Jajoo, Anjana
Kunderlikova, Kristyna
Ferroni, Lorenzo
Goltsev, Vasilij
Tambussi, Eduardo
Stirbet, Alexandrina
Samborska, Izabela A.
Olsovska, Katarina
Kalaji, Hazem M.
Misra, Amarendra N.
Opis:
Using chlorophyll (Chl) a fluorescence many aspects of the photosynthetic apparatus can be studied, both in vitro and, noninvasively, in vivo. Complementary techniques can help to interpret changes in the Chl a fluorescence kinetics. Kalaji et al. (Photosynth Res 122:121-158, 2014a) addressed several questions about instruments, methods and applications based on Chl a fluorescence. Here, additional Chl a fluorescence-related topics are discussed again in a question and answer format. Examples are the effect of connectivity on photochemical quenching, the correction of FV/FM values for PSI fluorescence, the energy partitioning concept, the interpretation of the complementary area, probing the donor side of PSII, the assignment of bands of 77 K fluorescence emission spectra to fluorescence emitters, the relationship between prompt and delayed fluorescence, potential problems when sampling tree canopies, the use of fluorescence parameters in QTL studies, the use of Chl a fluorescence in biosensor applications and the application of neural network approaches for the analysis of fluorescence measurements. The answers draw on knowledge from different Chl a fluorescence analysis domains, yielding in several cases new insights.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 688

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