National Repository of Grey Literature 14 records found  previous11 - 14  jump to record: Search took 0.00 seconds. 
Výpočty nízkonapěťového BSE detektoru
Wandrol, Petr ; Autrata, Rudolf
The scintillator-photomultiplier detection system installed under the pole piece represents the most efficient BSE detector in SEM. However, the initial energy of the BSEs of 0.5-3 keV in the LV SEM is the energy, on which the light yield of scintillators decreases. Appropriate acceleration of BSEs and declination of SEs is necessary for the best BSE image at low acceleration voltage. Electrostatic field affecting signal electron trajectories was simulated in the software package Simion 3D.
Numerický obor a numerický poloměr
Žitný, K. ; Kozánek, Jan
Numerical range and numerical radius as an important instrument for the description of linear operators are analysed in this paper. The possibilities of the computations of the numerical range and numerical radius are presented, too.
Porovnání magnetického pole vně a uvnitř trolejbusu 21 Tr řízeného GTO nebo IGCT tyristorem
Nečesaný, Jakub ; Doležel, Ivo
This work is focused on the magnetic field modelling and analysis inside the trolley bus 21TR. Mathematical description is presented. Computation is carried out for accelerating regime for application of two different power switching semiconductor devices GTO and IGCT. Study of the magnetic field is done for head level of standing and sitting people. Local maximum of the magnetic field is also determined. Differences between magnetic field levels given by GTO and IGCT power switching semiconductor devices are consecrated. Finally, geometrical convergence of this problem is evaluated

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