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A novel AAS atomizer based on a dielectric barrier plasma discharge
Novák, Petr ; Kratzer, Jan (advisor) ; Kanický, Viktor (referee)
Atomization of arsine in a novel hydride atomizer for atomic absorption spectrometry (HG-AAS) was thoroughly optimized. This plasma atomizer is based on a dielectric barrier discharge (DBD). Sensitivity and detection limit reached 0.48 s ng-1 As and 0.16 ng ml-1 As, respectively, under optimum atomization conditions (Ar discharge using a flow rate of 60 ml min-1 Ar, DBD power 17 W). Analytical figures of merit reached in DBD are comparable to those found in an externally heated quartz tube multiatomizer (MMQTA) that was chosen as a model of conventional approach to hydride atomization in HG-AAS. An extent of interferences (Se, Sb, Bi) during As determination was investigated comparing both MMQTA and DBD atomizers. The later one was found to be more resistant towards interferences. A simple preconcentration of As in a DBD atomizer was reached after oxygen introduction into the Ar plasma in the DBD resulting in analyte retention in the atomizer followed by its volatilization once the oxygen flow is switched off. Preconcentration efficiency of 100 % was reached and detection limit improvement by a factor of ten was achieved (0.01 ng ml-1 As, preconcentration period 300 s).
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Nuclear Society - United States of America 1945 - 1964
Ulvr, Michal ; Kovář, Martin (advisor) ; Skřivan, Aleš (referee) ; Tajovský, Ladislav (referee)
Michal Ulvr Abstract It was the near-end of the Second World War, which defined the popular reception of the Atomic bomb for upcoming decade. In the first year of the nuclear monopoly, the feeling of uncertainty and fear of death in the nuclear war was not yet present in strength. The mood of relative safety dominated the American society till the fall of the monopoly in 1949. Since the first atomic explosion occurred in the USSR, the atmosphere of fear, that never faded back and was latent since August and September 1945, made an exuberant appearance in press and other media. Suddenly, the American government made (after years of neglect) a great effort to calm down the uncertainty of the public. A Federal Civil Defense Administration was established at the end of 1950 and provided more or less useful information, propaganda, material and logistical support for a war with the Soviet Union, which was expected to come sooner or later. Plenty of educational and propaganda pamphlets, books and training films were produced in determination to make it clear, that survival under nuclear attack was possible. And indeed, at that time, there was even a good chance, that keeping some basic survival rules in mind an individual could come out of a nuclear attack relatively unscathed. Administration even tried to...
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The Significance of the Soviet Espionage During Atomic Weapon Research
Gottwald, Antonín ; Pondělíček, Jiří (advisor) ; Litera, Bohuslav (referee)
in English This bachelor thesis has a title The Significance of the Soviet Espionage During Atomic Weapon Research. Its concern is the theme of Soviet atomic espionage in the United States of America before, during, and after World War II. The research question is the significance of the information stolen from the American atomic research by the Soviet spies to be used for the Soviet atomic research after the World War II. To answer the question, the American atomic research is described here together with methods and technologies developed here. The concrete spies, who infiltrated the Manhattan Project are concern of this thesis, too. The information they stole from the project helped the Soviet Union to create the atomic bomb only in four years, the scale of the espionage was large. One chapter is dedicated also to the Soviet atomic research. This chapter describes the circumstances and weaknesses of the Soviet research like the scepticim of Josif V. Stalin and the German invasion which precluded the research almost definitelly. Another part of the thesis is also analysis of the espionage system in the United States. This base in sufficient to answer the research question about the significance of the stolen information. The Soviet Union only needed to reconstruct the American methods with...
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A novel AAS atomizer based on a dielectric barrier plasma discharge
Novák, Petr ; Kratzer, Jan (advisor) ; Kanický, Viktor (referee)
Atomization of arsine in a novel hydride atomizer for atomic absorption spectrometry (HG-AAS) was thoroughly optimized. This plasma atomizer is based on a dielectric barrier discharge (DBD). Sensitivity and detection limit reached 0.48 s ng-1 As and 0.16 ng ml-1 As, respectively, under optimum atomization conditions (Ar discharge using a flow rate of 60 ml min-1 Ar, DBD power 17 W). Analytical figures of merit reached in DBD are comparable to those found in an externally heated quartz tube multiatomizer (MMQTA) that was chosen as a model of conventional approach to hydride atomization in HG-AAS. An extent of interferences (Se, Sb, Bi) during As determination was investigated comparing both MMQTA and DBD atomizers. The later one was found to be more resistant towards interferences. A simple preconcentration of As in a DBD atomizer was reached after oxygen introduction into the Ar plasma in the DBD resulting in analyte retention in the atomizer followed by its volatilization once the oxygen flow is switched off. Preconcentration efficiency of 100 % was reached and detection limit improvement by a factor of ten was achieved (0.01 ng ml-1 As, preconcentration period 300 s).
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Nuclear Society - United States of America 1945 - 1964
Ulvr, Michal ; Kovář, Martin (advisor) ; Skřivan, Aleš (referee) ; Tajovský, Ladislav (referee)
Michal Ulvr Abstract It was the near-end of the Second World War, which defined the popular reception of the Atomic bomb for upcoming decade. In the first year of the nuclear monopoly, the feeling of uncertainty and fear of death in the nuclear war was not yet present in strength. The mood of relative safety dominated the American society till the fall of the monopoly in 1949. Since the first atomic explosion occurred in the USSR, the atmosphere of fear, that never faded back and was latent since August and September 1945, made an exuberant appearance in press and other media. Suddenly, the American government made (after years of neglect) a great effort to calm down the uncertainty of the public. A Federal Civil Defense Administration was established at the end of 1950 and provided more or less useful information, propaganda, material and logistical support for a war with the Soviet Union, which was expected to come sooner or later. Plenty of educational and propaganda pamphlets, books and training films were produced in determination to make it clear, that survival under nuclear attack was possible. And indeed, at that time, there was even a good chance, that keeping some basic survival rules in mind an individual could come out of a nuclear attack relatively unscathed. Administration even tried to...
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Comparison of Nuclear Energy Policy in the Czech Republic and France
Loiseau, Jean-Camille ; Šauer, Petr (advisor) ; Dvořák, Antonín (referee)
This paper studies the nuclear technology and evaluates the most likely technical developments to come until 2030. It examines the features of Czech and French nuclear programs, compares the structures of nuclear sectors and estimates the advantages & drawbacks of further developments in both countries. The paper assesses if certain developments of the nuclear sector in one country can be used in the other country and vice-versa. Finally, proposes a set of recommendations for both countries regarding the development of their nuclear program.
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