|
|
Interference in the photochemical generation of volatile Se species using TiO2 photocatalyst
Nentvich, Daniel ; Nováková, Eliška (advisor) ; Hraníček, Jakub (referee)
The diploma thesis deals with the study of interferences in the method of UV-photochemical vapour generation of volatile Se species in formic acid media catalysed by nanocrystalline titanium dioxide. High resolution continuum source atomic absorption spectrometry was used for detection. It was observed that SeVI was less resistant to pH change relative to SeIV , while at pH = 2.3, a 20% increase in response was observed for this specie. It was further observed that both the generated volatile SeIV and SeVI species are resistant to UV radiation in the gas phase. The Cu2+ and Ag+ ions were particularly significant interferents in the SeIV determination. Interference behaviour was also observed for Cd2+ ions and silver nanoparticles. In the case of Cd2+ ions, the generation of cadmium selenide was likely observed. For Zn2+ , Fe2+ , Co2+ ions, there was an increase in response of more than 30% and 40%, in case of Ni2+ ions. The Co2+ and Ni2+ ions were chosen as reaction modifiers. For the UV-photochemical vapour generation of selenium species with photocatalyst and reaction modifiers, there was a 4-fold improvement in detection limits and limits of quantification compared to the method without these modifiers. In addition, the overall generation efficiencies for SeIV (64.7 %) and SeVI (68.6 %) were...
|
|
|
Photochemical generation of volatile species of rhodium as an efficient sample introduction technique for inductively coupled plasma mass spectrometry
Hašlová, Karolína ; Musil, Stanislav (advisor) ; Nováková, Eliška (referee)
This master's thesis is focused on development of a new analytical method based on photochemical generation of volatile species (PCVG) of rhodium as an efficient sample introduction technique for inductively coupled plasma mass spectrometry. At first, the conditions affecting the PCVG efficiency were optimized, namely carrier gas flow rate, irradiation time, composition of the reaction medium as well as the impact of transition metal ions as potential sensitizers was examined. The combination of Cu2+ and Co2+ was found optimal, enhancing the PCVG efficiency more than 60-fold. Additionally, a serious effect of the residence time of volatile species in the reaction medium, after exiting the irradiated part of the photoreactor, was found. The PCVG efficiency was doubled by modifying the output part of the photoreactor and another two-fold increase in the PCVG efficiency was achieved using the addition of nitrate anions to the reaction medium. Under chosen optimal conditions, the limit of detection and quantification were 13 pg dm-3 (3σ, n = 11) and 42 pg dm-3 (10σ, n = 11), respectively, and the PCVG efficiency was determined to be 13.5 ± 0.1%. The repeatability (n = 10) at 20 ng dm-3 was 2.9%. These experiments were followed by a study of interferences commonly occurring in the PCVG methods (chloride...
|
|
|
Mutual Help and Care in Multigenerational Families
NOVÁKOVÁ, Eliška
This bachelor thesis deals with a current topic, namely mutual aid and care in families in multigenerational cohabitation. The theoretical part of the bachelor thesis is devoted to the family, the ontogeny of the different developmental periods, which are important for understanding the needs of each generation. The last chapter focuses on multigenerational cohabitation. The practical part includes an evaluation of the results that were found during the research investigation. The main aim of my bachelor thesis is to identify the strengths and weaknesses of multigenerational cohabitation, and I have used qualitative research inquiry to fulfil this aim. The main research question is: "What is the impact of multigenerational cohabitationon mutual help and care?" For data collestion the techniqur of semi-structured interviews was. Choosen Communication partners were selected for the research using the snowball method. The open coding method based on semi-structured interviews was used to evaluate the qualitative data. The research work was conducted using interviews with communication partners divided by generation, which allowed for generation-specific results. From the research, strengths were identified as the transfer of experiences leading to another one, which is the deepening of interpersonal relationships. As a result, the most important strength emerged and that is the increased need for help and car. Weaknesses were identified in the research and these are mainly differences of opinion that arise due to other weaknesses which are privacy restrictions and control. The bachelor thesis can serve as an information material for families who are considering multigenerational living arrangements or are already living in such an arrangement, it can also serve as a study material for students dealing with this issue.
|
|
|
Expressing identity and emotions in Natasha Holme's diaries
NOVÁKOVÁ, Eliška
This thesis focuses on recording the manner in which Natasha Holme (pseudonym, born 1969) captured her emotions and expressed her - at that time developing - identity in her diaries. This thesis will offer a brief insight into lesbian history, it will introduce tendencies, which resonate in Natasha's own work, and then it will concentrate on how Natasha Holme explored various aspects of her crystalizing identity on the pages of her diaries. The aim of this thesis is to investigate her obsessive desire to capture every detail of her life and to outline the contrast that arises between her inner world, imprisoned within the pages of her diaries, and the reality that reigned outside these pages.
|
|
|
Laser welding of plastics
Nováková, Eliška ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The bachelor presents a brief characteristics of thermoplastics welding methods followed by a more detailed description of laser welding of thermoplastics, i.e. laser description, division and types. Then, conditions and parameters of welding are defined. The experimental part is focused namely on visual welding tests on a test sample. The sample consists of two types of material – pure polymethyl methacrylate and black polycarbonate – which are used in car headlamp production. For welding, a diode laser designed for thermoplastics welding was used. The main target of inspection were flaws that were visible on macroscopically enlarged images. The tested welds mostly showed porosity and air bubbles. Finally, an evaluation of the experiment is conducted.
|
|
|
Analysis of Customer Services in TAMTAM BAR
Vrabcová, Kateřina ; Nováková, Eliška (referee) ; Chalupský, Vladimír (advisor)
This bachelor's thesis deals with an analysis of customer services provided by TAMTAM BAR restaurant in Kromeriz. In the theoretical part mainly the issues of marketing research and customer satisfactory are processed. The analytical part is focused on the introduction of the company itself, followed by the evaluation and the analysis of customer satisfaction. As the result this in turn leads to proposal of measures for quality level increase of analyzed services.
|
|
|
Influence of technological process of powder painting on the quality of silver-plated components in gas insulated substation - GIS
Nováková, Eliška ; Prosecký, Vít (referee) ; Kubíček, Jaroslav (advisor)
The thesis deals with the topic of silver coating on the inner surface of the tubes made of aluminum alloy EN AW-6101B. The high affinity of the aluminum for the oxygen, the heterogeneity of the surface and the presence of the hydrogen in the base material, are the properties which hinder the formation of metallic coating on the surface of the aluminum alloy. The saturation of the base material with the hydrogen, e.g. due to the pretreatment of the surface or by the process of creating of coatings, may under certain conditions cause the defects of the silver coating in the form of the bubbles (blisters). Other factors that may affect the quality of the silver coating are the way of creating of the interlayer and the conditions for the electrolytic deposition of the silver.
|
|
|
Development of a Small Family Business
Nováková, Eliška ; Konečný, Štěpán (referee) ; Koráb, Vojtěch (advisor)
The bachelor thesis deals with the development of a small family business. The theoretical part contains business papers. This is followed by an analytical section describing in detail both the internal and external environment of a specific business. Its‘ position is determined, based on the strategic analysis, then things are designed to help increase the company revenue. The last part includes several suggestions, that should result in the higher sales.
|
|
|
Machining of Hardened Steel on CNC Machines
Nováková, Eliška ; Prokop, Jaroslav (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis deals with the topic of machining of hardened steels on CNC machines. In the first part there is the description of the company, in which the particular hardened part was machined. The next part of the thesis focuses on properties of hardened steel and their suitability for machining. The middle part of the work states the basic machining technologies used in the company and programming of the CNC machines. Further there are described the materials of the cutting tools for machining of the steel from selected producers/manufacturers. At the end of this thesis the machining of the particular hardened component is described, and the evaluation of the technology procedure is made.
|
|
|
The Efficiency of Machines Evaluation for Production Task Ensuring
Nováková, Eliška ; Průša, Michal (referee) ; Jurová, Marie (advisor)
The diploma thesis deals with evaluation of obtained data from selected production equipment. The theoretical part is focused on production management, description of information production systems and defining methods for evaluation of machine efficiency. The practical part describes the current situation of selected productive sections and outputs from two compared systems. Next step is the calculation of OEE indicators, evaluation of individual workplaces and suggestions for improvement.
|
guest ::
RSS feed.