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The Role of Secondary Electron Emission in Dust Grain Charging
Richterová, Ivana ; Němeček, Zdeněk (advisor) ; Stöckel, Jan (referee) ; Tomková, Eva (referee) ; Frank, Luděk (referee)
Title: The Role of Secondary Electron Emission in Dust Grain Charging Author: Ivana Richterová Department: Department of Surface and Plasma Science Supervisor: Prof. RNDr. Zdeněk Němeček, DrSc. Abstract: This work presents a secondary emission model focused on micron and submicron dust grains. The results allowed us to predict surface potentials of grains charged by 50 eV -- 15 keV electron beams. The probability that such electrons penetrate through grains increases with their energy and decreases with a grain size and depends on a grain shape. Model predictions were experimentally verified for glass, gold, and carbon spherical grains and for lunar regolith simulants. In dusty plasmas, charge accumulated on dust grains and plasma parameters govern the ensemble dynamics. The model can be thus utilised in calculations of phenomenon in planet magnetospheres (e.g. spokes in Saturn's rings), in tokamak edge plasmas, etc. Keywords: Secondary emission, dust grains, dust charging
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Mexican Influenza - is it real threat of pandemia?
Tomková, Eva ; Čelko, Alexander (advisor)
Pandemic influenza is global spreading of new influenza virus. Population is not immune from this kind of virus yet. Is possible, that this new species is mutated influenza virus, or that is originated from recombination of human and animal viruses. Pandemic influenza A (H1N1) is first pandemic influenza in 21. century. It has started as an epidemic influenza of new virus A (H1N1) from swine origin, in North America. Virus has been world-wide spreading during these several months and at the moment many steps of pandemic reduction are being accepted. "Swine influenza" - is acute viral disease of respiratory tract of swine, caused by influenza virus A. This swine infection is slight, mortality is low. Very rarely, the virus can be transferred also to human. In spite of the fact, that World Health Organization (WHO) declared 6th pandemic degree on 11. 6. 2009 - that was caused by new influenza virus A (H1N1) of swine origin - it is necessary to follow prevention steps of seasonal influenza and get immunized repeatedly. Declaration of pandemic was not based on disease's seriousness caused by influenza virus, but on incidence of new cases, world-wide reported. Pandemic occurs currently only in a slight form.
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The Role of Secondary Electron Emission in Dust Grain Charging
Richterová, Ivana ; Němeček, Zdeněk (advisor) ; Stöckel, Jan (referee) ; Tomková, Eva (referee) ; Frank, Luděk (referee)
Title: The Role of Secondary Electron Emission in Dust Grain Charging Author: Ivana Richterová Department: Department of Surface and Plasma Science Supervisor: Prof. RNDr. Zdeněk Němeček, DrSc. Abstract: This work presents a secondary emission model focused on micron and submicron dust grains. The results allowed us to predict surface potentials of grains charged by 50 eV -- 15 keV electron beams. The probability that such electrons penetrate through grains increases with their energy and decreases with a grain size and depends on a grain shape. Model predictions were experimentally verified for glass, gold, and carbon spherical grains and for lunar regolith simulants. In dusty plasmas, charge accumulated on dust grains and plasma parameters govern the ensemble dynamics. The model can be thus utilised in calculations of phenomenon in planet magnetospheres (e.g. spokes in Saturn's rings), in tokamak edge plasmas, etc. Keywords: Secondary emission, dust grains, dust charging
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Mexican Influenza - is it real threat of pandemia?
Tomková, Eva ; Čelko, Alexander (advisor)
Pandemic influenza is global spreading of new influenza virus. Population is not immune from this kind of virus yet. Is possible, that this new species is mutated influenza virus, or that is originated from recombination of human and animal viruses. Pandemic influenza A (H1N1) is first pandemic influenza in 21. century. It has started as an epidemic influenza of new virus A (H1N1) from swine origin, in North America. Virus has been world-wide spreading during these several months and at the moment many steps of pandemic reduction are being accepted. "Swine influenza" - is acute viral disease of respiratory tract of swine, caused by influenza virus A. This swine infection is slight, mortality is low. Very rarely, the virus can be transferred also to human. In spite of the fact, that World Health Organization (WHO) declared 6th pandemic degree on 11. 6. 2009 - that was caused by new influenza virus A (H1N1) of swine origin - it is necessary to follow prevention steps of seasonal influenza and get immunized repeatedly. Declaration of pandemic was not based on disease's seriousness caused by influenza virus, but on incidence of new cases, world-wide reported. Pandemic occurs currently only in a slight form.
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Corporate culture
Jurečka, Pavel ; Srpová, Jitka (advisor) ; Tomková, Eva (referee)
Presented thesis describes theme "Corporate culture" in business organization. It gives the overview of theoretical approaches of different authors about points at issue corporate culture. In thesis are depicted topics such as factors of direction and control, motivation and organizational structure. It narrates the way from identity to image of business organization. Practical part is devoted to analysis of corporate culture in organization WEBCOM-AXPERIENCE a.s. and the main aim is to suggest precautions, which will better contribute to accomplishing the organizational long-range goals.
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