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Fly-ash mobility in sandy material
Kodešová, R. ; Kapička, Aleš ; Fialová, Hana ; Žigová, Anna ; Kočárek, M. ; Kopáč, J. ; Petrovský, Eduard
Fly-ash migration in three sands of various particle size distributions and consequently various porosities was studied in the laboratory. The fly-ash was applied on the top of all sands packed in plastic cylinders followed by pulse infiltrations. Water regime was monitored using the soil water content sensors SM200 and micro-tensometers T5. Kappameter SM400 was used to monitor migration of ferrimagnetic particles-tracers presented in the fly-ash. Undisturbed samples of sands polluted by fly-ash were taken at the end of the experiments to study final fly-ash distribution in section planes and thin sections of sandy material.
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Vliv magnetické susceptibility na T1 relaxace 129Xe.
Bartušek, Karel ; Rychnovský, Jan
Every substance has its own susceptibility, which can affect homogenous magnetic field in magnetic resonance measuring. Local homogenous magnetic field deformation reduces T1 and T2 relaxation times of measured materials. By the laboratory glasses magnetic susceptibilities measurement, we obtained theirs walls influence to thermally polarized 129Xe T1 relaxation times.
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Měření magnetické susceptibility metodou MRI
Steinbauer, M. ; Bartušek, Karel ; Fiala, P.
A magnetic resonance imaging method is described for measuring the magnetic susceptibility ofweakly magnetic materials giving no MR signál. Method is based on MR gradient echo imaging phase signál, using its independency on T, time. The results obtained by Finite element method (FEM) modeling as well as data measured by MRI are introduced.
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