|
|
Geometric surface modeling
Adámková, Barbora ; Martišek, Dalibor (referee) ; Štarha, Pavel (advisor)
The Bachelor thesis deals with display geometric surfaces on a computer in parallel projection and central projection. It includes part of mathematical theory which is necessary for definition of given projection. There are couple of important terms defined such as euclidean space, projective space, surfaces and elementary operations. The thesis also includes description of applications development for display geometric surfaces by using the author's own procedures and functions (so-called library) in Delphi 7 and by using OpenGL library. This Bachelor thesis result is the writer's own implementation of described processes by applications development.
|
|
| |
|
|
Diagnostics of plasma generated by electrical discharge in organic solutions
Adámková, Barbora ; Krčma, František (referee) ; Kozáková, Zdenka (advisor)
This work deals with electrical discharge in organic solutions. The theoretical part was focused on plasma discharge in liquids and also plasma diagnostics. In the experimental part the influence of experimental conditions on the ignition of the discharge in alcohols was observed. Especially, the polarity of the applied voltage, concentration and conductivity of the solution was studied. Moreover, the amount of generated hydrogen peroxide in the ethanol solutions as well as the electrolyte solution of two different conductivities was determined. The results compared the current-voltage characteristic curve during the stable discharge and the phases that preceded it. These phases were the creation of bubbles, occasional ignition and stable discharge. From the recorded average values of current and voltage, current-voltage characteristics were constructed. It was found, that the increasing conductivity of the solution leads to an earlier discharge. In case of negative polarity of the voltage input on the main electrode, there was an earlier discharge than in the positive polarity. Voltage value necessary for the discharge ignition was lower by several hundred volts in the negative polarity. For example, for a solution of 95 vol. % ethanol and conductivity of 200 S, the breakdown voltage for a positive polarity was determinated as 1650 V but at negative polarity this voltage was only 1250 V. Moreover the influence of ethanol concentration on the ignition of the discharge was found, but there was no significant effect. Amount of generated hydrogen peroxide grew linearly with time. In the electrolyte solution, hydrogen peroxide was formed significantly more in comparison to the ethanol solution.
|
|
|
Diagnostics of plasma generated in mixtures of water and alcohols
Adámková, Barbora ; Slavíček, Pavel (referee) ; Kozáková, Zdenka (advisor)
This diploma thesis is aimed to the corona-like discharge in solutions of alcohols, specifically in ethanol, methanol, glycerol, butanol and isopropyl alcohol. The electric discharge was diagnosed by two methods. The first method was the measuring of electrical characteristics. Current-voltage characteristics were constructed from the measured average values of voltage and current. The breakdown voltages were determined from the current-voltage characteristics. The breakdown voltages of the individual alcohol solutions were dependent on the alcohol concentration, polarity of the electrodes in the reactor and solution conductivity. The breakdown voltage was determined for solutions of butanol, glycerol and isopropyl alcohol with a concentration of 20 vol. % and conductivity of 200 µS. The highest value of the breakdown voltage was determined for solution of glycerol at 580 V. The lowest voltage at which the discharge was observed was estimated for butanol (320 V), but due to the limited miscibility with water this value is inaccurate, and therefore in the second part of experiment butanol was not used. Alcohol series was supplemented with methanol. The second diagnostic method was the proton ionization mass spectrometry with the time of flight analyzer. The products formed in the reactor due to the plasma discharge were identified from the mass spectrum. Mostly, aliphatic hydrocarbons and their radicals were detected. The amount of products was observed in the dependence on the changing experimental conditions: alcohol concentration in the solution, the polarity of the electrodes in the reactor and the duration of the discharge. Only a small amount of compounds were detected in methanol. However, more molecules were formed with the increasing carbon chain in the alcohol molecule. More compounds were also detected with the increasing alcohol concentration and in case of the negative polarity of the main electrode. The formation of acetaldehyde as a typical discharge product was studied in details. Its production in time was observed and the reaction pathways of its formation in the ethanol solution were suggested.
|
|
|
Diagnostics of plasma generated in mixtures of water and alcohols
Adámková, Barbora ; Slavíček, Pavel (referee) ; Kozáková, Zdenka (advisor)
This diploma thesis is aimed to the corona-like discharge in solutions of alcohols, specifically in ethanol, methanol, glycerol, butanol and isopropyl alcohol. The electric discharge was diagnosed by two methods. The first method was the measuring of electrical characteristics. Current-voltage characteristics were constructed from the measured average values of voltage and current. The breakdown voltages were determined from the current-voltage characteristics. The breakdown voltages of the individual alcohol solutions were dependent on the alcohol concentration, polarity of the electrodes in the reactor and solution conductivity. The breakdown voltage was determined for solutions of butanol, glycerol and isopropyl alcohol with a concentration of 20 vol. % and conductivity of 200 µS. The highest value of the breakdown voltage was determined for solution of glycerol at 580 V. The lowest voltage at which the discharge was observed was estimated for butanol (320 V), but due to the limited miscibility with water this value is inaccurate, and therefore in the second part of experiment butanol was not used. Alcohol series was supplemented with methanol. The second diagnostic method was the proton ionization mass spectrometry with the time of flight analyzer. The products formed in the reactor due to the plasma discharge were identified from the mass spectrum. Mostly, aliphatic hydrocarbons and their radicals were detected. The amount of products was observed in the dependence on the changing experimental conditions: alcohol concentration in the solution, the polarity of the electrodes in the reactor and the duration of the discharge. Only a small amount of compounds were detected in methanol. However, more molecules were formed with the increasing carbon chain in the alcohol molecule. More compounds were also detected with the increasing alcohol concentration and in case of the negative polarity of the main electrode. The formation of acetaldehyde as a typical discharge product was studied in details. Its production in time was observed and the reaction pathways of its formation in the ethanol solution were suggested.
|
|
|
Diagnostics of plasma generated by electrical discharge in organic solutions
Adámková, Barbora ; Krčma, František (referee) ; Kozáková, Zdenka (advisor)
This work deals with electrical discharge in organic solutions. The theoretical part was focused on plasma discharge in liquids and also plasma diagnostics. In the experimental part the influence of experimental conditions on the ignition of the discharge in alcohols was observed. Especially, the polarity of the applied voltage, concentration and conductivity of the solution was studied. Moreover, the amount of generated hydrogen peroxide in the ethanol solutions as well as the electrolyte solution of two different conductivities was determined. The results compared the current-voltage characteristic curve during the stable discharge and the phases that preceded it. These phases were the creation of bubbles, occasional ignition and stable discharge. From the recorded average values of current and voltage, current-voltage characteristics were constructed. It was found, that the increasing conductivity of the solution leads to an earlier discharge. In case of negative polarity of the voltage input on the main electrode, there was an earlier discharge than in the positive polarity. Voltage value necessary for the discharge ignition was lower by several hundred volts in the negative polarity. For example, for a solution of 95 vol. % ethanol and conductivity of 200 S, the breakdown voltage for a positive polarity was determinated as 1650 V but at negative polarity this voltage was only 1250 V. Moreover the influence of ethanol concentration on the ignition of the discharge was found, but there was no significant effect. Amount of generated hydrogen peroxide grew linearly with time. In the electrolyte solution, hydrogen peroxide was formed significantly more in comparison to the ethanol solution.
|
|
| |
|
| |
|
| |
|
|
Geometric surface modeling
Adámková, Barbora ; Martišek, Dalibor (referee) ; Štarha, Pavel (advisor)
The Bachelor thesis deals with display geometric surfaces on a computer in parallel projection and central projection. It includes part of mathematical theory which is necessary for definition of given projection. There are couple of important terms defined such as euclidean space, projective space, surfaces and elementary operations. The thesis also includes description of applications development for display geometric surfaces by using the author's own procedures and functions (so-called library) in Delphi 7 and by using OpenGL library. This Bachelor thesis result is the writer's own implementation of described processes by applications development.
|
guest ::
RSS feed.