"Annual Conference of Doctoral Students - WDS 2012 /21./" - Výsledky hledání - Digitální repozitář

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	Status of Development of High Temperature Radiation Hardened Hall Sensors for Energy Producing Fusion Devices Kovařík, Karel ; Ďuran, Ivan ; Sentkerestiová, J. ; Oszwaldowski, M. ; Viererbl, L. ; Boshakova, I. ; Holyaka, R. ; Erashok, V. A principally new diagnostic method has to be developed to allow the magnetic measurements in true steady state regime of operation of future fusion reactors. One of the options is use of diagnostics based on Hall sensors that are well established in experimental physics and industry. There are two main issues associated with the use of Hall sensors in harsh environment of future fusion reactors. They are low survival temperature of available commercial transducers and unreliability of these mostly semiconductor sensors under neutron irradiation. This paper describes status of development of sensors to be operational in conditions mentioned above. Úplný záznam
	Magnetic properties of doped CeO.sub.2./sub. nanoparticles and CeO.sub.2./sub.-Fe.sub.2./sub.O.sub.3./sub. mixed oxides Mantlíková, Alice ; Bittová, Barbara ; Burianová, Simona ; Vejpravová, Jana ; Nižňanský, D. ; Holec, Petr We have investigated magnetic properties of CeO2 nanoparticles and CeO2/SiO2 nanocomposites doped by various magnetic metal oxide ions (Fe, Gd, Sm, Nd). Samples were obtained by co-precipitation and sol-gel method. Particle size has been obtained as 5 - 25 nm for nanocomposite and 25 - 100 nm for nanoparticles increasing with the increase of the annealing temperature. Detailed measurements of magnetization demonstrate paramagnetic state in the majority of the doped samples with maximum magnetization decreasing with the decrease of effective magnetic moment of the dopant ions from Gd3+ to Nd3+. It has been also observed, that the high-coercivity ε-Fe2O3 forms in CeO2-Fe2O3/SiO2 nanocomposite for higher concentration of the Fe ions (Ce/Fe/Si ratio equal to 1/2/9) and for the highest annealing temperature. Úplný záznam
	Parameters sensitive to the mass composition of cosmic rays and their application at the Pierre Auger Observatory Vícha, Jakub The Pierre Auger Observatory studies extensive cosmic ray showers of energy above 1018 eV. The mass composition of the shower–inducing primary particles plays an important role in the search for an anisotropy of their arrival directions and in considerations about the possible mechanisms of their acceleration. Several air shower parameters carrying information about the mass of primary cosmic ray are introduced and their applications to data of the Pierre Auger Observatory are discussed. Úplný záznam
	On transfer of mass and angular momentum from accretion disk onto black hole Hamerský, Jaroslav ; Karas, Vladimír We study the properties of accretion tori orbiting Kerr black hole. Our approach to this problem comes from the solving of general relativistic magnetohydrodynamic equations, which follow from conservation of the energy-momentum tensor, the particle number and from Maxwell's equations. We solve these equations by numerical methods. We are interested in tori with constant density of angular momentum and those with radially increasing angular momentum density. We study accretion rates in these tori when the mass of black hole is increased suddenly and so the equilibrium in the torus is perturbed. We also study the influence of the presence of toroidal magnetic field on accretion rates. Úplný záznam

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