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Optimalizace detekce sekundárních elektronů segmentovým ionizačním detektorem v environmentálním REM
Černoch, P. ; Jirák, Josef
The article deals with a prezentation of results of optimization of secondary electron detection by an ionization detector in the environmental scanning electron microscope. The ionization detectors consisting of a varied electrode geometry and varied voltages on these electrodes, named segmental ionization detectors, are presented as a possibility to reach desired contrasts in a specimen image. In this work, images acquired by several detectors demonstrate detection of different types of signal electrons utilizing a specimen containing thin surface layers and a specimen made for a material contrast measurement.
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CAD v elektronové optice
Lencová, Bohumila
Invited talk on 8th Multinational congress on microscopy in the session Electron optics and optical elements. It discusses the themes of reduced interest in papers from electron optics on microscopy conferences and the progress in computational programs (such as EOD from ISI AS CR), in particular in accurate electron ray tracing in electromagnetic fields and in user interfaces.
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Zkušenosti se zaváděním výuky Solidworksu
Maxa, J. ; Neděla, Vilém
The world trend TPV tends complex solutions of the system from the from of a sketch to manufacture. In order to be prepared for this trend, the Universities are required to react to it. There is a system of courses described in the article which in forms the students about this methodology.
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Detekce signálu segmentovým ionizačním detektorem
Černoch, P. ; Jirák, Josef
This article deals with signal detection by a segmental ionization detector. Changes of image contrasts in a dependency on different potentials on electrodes of the segmental ionization detector are studied. Electron trajectories in an electrostatic field in a vacuum simulated via program Simion 3D 7.0 are considered during the experiment.
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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.
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Pozorování zubní skloviny a dentinu v SEM
Wandrol, Petr ; Roubalíková, L. ; Autrata, Rudolf
The purpose of this study was to investigate whether the acidic monomer based on the phosphoric acid ether acrylate can create the same retentive pattern in enamel and dentin as the conventional treatment with the 37% phosphoric acid. The surface of enamel in the AdHeSe group was slightly undulated, the retentive pattern was regular and moderate. In the TotalEtch group more irregularities and a clearer retentive pattern were observed. The dentin surface was similar in both groups- it was clean without the smear layer, the dentin tubuli were open, the collagen network was seen on the dentin surface as well as in the dentin tubuli.
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