Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
The results of the microstructural and dielectric measurements of (Ba1-xPbx)(Ti1-xSnx)O3 (BPTSx) (x = 0, 0.05, 0.10, 0.30) polycrystalline samples are presented. The samples were obtained by means of a high temperature synthesis and their expected stoichiometry was confirmed by energy dispersive spectroscopy (EDS) measurements. The dielectric properties of BPTSx were studied with the use of broadband dielectric spectroscopy. The measurements over a wide range of temperature (from 140 K to 600 K) and frequency (from 0.1 Hz to 10 MHz) were performed. The experimental results indicate an influence of Pb ions in a sublattice A and Sn ions in a sublattice B substitution on paraelectric - ferroelectric phase transition parameters. Diffused phase transitions from a paraelectric to ferroelectric state (for x = 0.10 and x = 0.30) were observed. From the electric modulus measurements in the frequency domain the relaxation times and the activation energy were determined.
EN
Radiotracer experiments on the model of rectangular settler with a volume of 3 m3, with a consecutive application as a tracer of the aqueous phase fluoresceine (representative tracer of water), eluate from a 68Ge/68Ga radioisotope generator (0.1 N HCl solution) and chelates after Ga ions complexation with 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) and 1,4,7,10-tetrazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) were carried out. The obtained residence time distribution (RTD) functions indicate that only the complex compounds of gallium are stable in the water phase and are not adsorb on the vessel walls, so they can be recommended as tracers of the water phase.
PL
Przedstawiono komplementarne zastosowanie metod znacznikowych i CFD do opisu i optymalizacji parametrów pracy mieszacza/dystrybu-tora ścieków z różnych źródeł uśredniającego ich skład chemiczny
EN
The possibility of application of naturally existing differences in isotope contents 18O/16O, 2H/1H in waters for investigation of transport and mixing of various waters in the tributary-river system is presented. Experiments carried out on the Bug-Narew rivers-Zegrze Lake and the BugoNarew-Vistula rivers systems have indicated that the hydrogen isotope ratio 2H/1H can be used as an intrinsic tracer of natural mixing processes occurring in rivers. The IRMS methodology was used for isotope ratio measurement of water samples. The degrees of water mixing as a function of distance from the confluence point of rivers were determined. The obtained results indicate that in water systems where the natural differences in ?2H are higher than 5‰ this technique can replace the time-consuming and expensive dye (or radiotracer) dispersion tests for evaluation of pollutant transport in rivers.
PL
Z wykorzystaniem metod CFD przeprowadzono numeryczną symulację procesu sedymentacji polidyspersyjnej zawiesiny osadu w osadniku prostokątnym. Uzyskano zadowalającą zgodność doświadczalnych i numerycznych funkcji rozkładu stężenia osadu po głębokości osadnika. Słowa kluczowe: sedymentacja osadu, CFD, osadnik prostokątny
EN
Using the CFD method numerical simulations of sedimentation processes in a rectangular settler were performed. A satisfactory agreement between experimental and numerical sediment distribution functions in the settler was obtained.
EN
The investigations of flow structure in an industrial rectangular settler for two systems of input and output - immersed and overflow - were carried out. Using the tracer and CFD methods the field of velocities and wastewater flow model were determined. The distributions of sediment contents in the settler volume were compared,
EN
Using the CFD method the numerical simulations of sedimentation processes in a rectangular settler were performed. A satisfactory agreement of experimental and numerical dependencies of the sediment distribution as a function of the settler depth was obtained.
PL
Przy pomocy kodów obliczeniowej mechaniki płynów wyznaczono dla różnych parametrów technologicznych, strukturę przepływu oraz krzywe rozkładu czasów przebywania (RCP) cieczy w osadniku prostokątnym. Krzywe (RCP) uzyskane drogą numeryczną weryfikowane były doświadczalnie przy użyciu metody znacznikowej. Uzyskano dobrą zgodność wyników. Procedura może być wykorzystana w badaniach instalacji przemysłowych.
EN
Using numerical codes of CFD the flow structure and residence time distribution curves (RTD) of a rectangular settler for different technological parameters were determined. The RTD curves obtained in numerical calculations were experimentally verified using the tracer method. A good compatibility of resuIts was achieved. The procedure can be applied in investigations of industrial scale units.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.