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National Repository of Grey Literature 24 records found  beginprevious21 - 24  jump to record: Search took 0.01 seconds. 
Comparison of flow conditions in the gas detector used in the aperture and screen
 Hubáček, Jiří ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
The first part of the thesis deals with electron microscopy and physical model fluid flow. In the next part, a three-dimensional model is created in programme SolidWorks. It is the model of scintilating detector with aperture or screen with three hundred little apertures. These models are submitted to analysis focusing on investigation of the gas flow at different pressure in chamber of specimen ESEM using Cosmos FloWorks system. The results of the analysis of both apertures variants are compared with the request to minimize the pressure in the trajectory of the secondary electrons as well as in the chamber of specimen.
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Influence of pressure in the specimen chamber to the conditions of the differential pumping
 Placzek, Roman ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
The paper primarily outlines fundamental issues of electron microscopy. The paper follows with analysing pumping of gas into EREM sample chambers at various pressure levels by using SolidWorks Flow Simulation in SolidWorks system. The results of analyses are assessed with respect to requirements so that the pressure in the track of primarily electrons is as low as possible with the view to reduce probability of its scattering.
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Observation of Insulators in ESEM
 Matějka, Milan ; Špinka, Jiří (referee) ; Jirák, Josef (advisor)
This graduation theses in introduction deals with principle and problems of electron signal detection in scanning electron microscopy and charging of insulating specimens in SEM. The experimental part of the thesis describe the methods of qualification and quantification of insulating specimen charging effect observed in environmental scanning electron microscope through the use of ionisation and scintillation detector in dependence on water vapour pressure in specimen chamber. The goal of the thesis is formation of the methodics useful to evaluate charging effect at insulating specimens observing and on the basis of measuring, determine optimal conditions for insulating specimen observation with ionisation and scintillation detector.
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Use of electronics product definition for the development of differentially pumped chamber
 Maxa, J. ; Neděla, Vilém
Environmental scanning electron microscope creates new possibilities in the field of examination various types of specimens and their phases. The article analyses 3nd compares the results of air pumping measurement for selected shapes of the differentially pumped chamber to create vacuum, using the Cosmos FloWorks system.
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National Repository of Grey Literature : 24 records found   beginprevious21 - 24  jump to record:
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