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Low-energy recycling of poly(ethylen terephthalate) waste
Slabá, Jitka ; Beneš, Hynek (advisor) ; Cajthaml, Tomáš (referee)
This thesis deals with a new low-energy method of chemical recycling of poly(ethylene terephthalate) (PET) using natural oils as reagents and microwave irradiation to accelerate depolymerization. The results of experiments with PET waste and castor oil, when the reaction mixture was heated in microwave reactor, showed that a complete depolymerization of PET chain has occured. Optimal conditions for the depolymerization PET were established: wt. ratio of PET / castor oil = 1 / 9.7, when the molar ratio of ester bonds of PET / hydroxyl groups of castor oil = 1 / 2.7, catalyst : zinc acetate at wt 1% from the PET mass, reaction temperature ranging from 235 to 245řC and the reaction time 60 min. Decomposition experiments also showed, that microwave irradiation accelerated decomposition of PET. Depolymerization reactionin MW reactor was complete at 6x shorter reaction time than the decomposition in the classically heated reactor. The results of analysis showed that the resulting product,the recyclate, was composed of unreacted castor oil and polyol products, that contained partially or fully esterified structural unit of PET, which were ended by ester-linked units of castor oil.
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Cold adaptation of insects: the role of shock proteins from Hsp family.
ŠTĚTINA, Tomáš
Heat shock proteins (Hsps) form evolutionarily conserved group of proteins that are best known for their unique function in repair of miss folded proteins that would otherwise aggregate in cells during stress conditions. The most extensively studied is the inducible Hsp70. Using 3rd instar larvae of transgene mutant of fruit fly, Drosophila melanogaster that lacks all copies of hsp70 gene, we assessed: 1) whether the absence of this gene is deleterious for larvae in their capacity to survive cold stress; and 2) whether any other gene from Hsps family may compensate for the loss of hsp70. We found that 1) survival of cold stress is not altered in Hsp- larvae when compared to wild type Hsp+ larvae; 2) there is no other gene of Hsps family that would compensate for the loss of hsp70 at the level of transcription. Our ongoing effort is focusing on analysis of cold stress response at the protein level.
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Unit Trust Evaluation in Light of Multiple-Criteria Decision Making
Kaňoková, Jana ; Kuncová, Martina (advisor) ; Fíglová, Zuzana (referee)
The target of this work is to evaluate the unit trusts in light of the multiple-criteria decision making. The unit trusts are divided into the groups according to the investor categories: unit trusts with conservative, balanced and aggressive portfolio. The unit trusts were lined up by the medium of the multiple-criteria decision making methods (PRIAM, ORESTE, MAPPAC) and it is also made an analysis why have each of the methods chosen the particular unit trust in the group as the best compromise variant.
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Differentiation of yeast colonies and development of new approaches to monitor oxygen and nutrient availability
Vopálenská, Irena ; Janderová, Blanka (advisor) ; Demnerová, Kateřina (referee) ; Pichová, Iva (referee)
Yeast Saccharomyces cerevisiae as an unicellular organism is one of the best-studied experimental organisms. It is an important model organism for the study of intracellular processes of eukaryotic cells. Yeasts are also social organisms with cell-to-cell communication able to form organized multicellular structures (colonies and biofilms). Yeast and other microorganisms in nature prefer to form colonies on solid substrates rather than to grow as "planktonic" single cells (Palková, 2004; Wimpenny, 2009). The yeast S. cerevisiae typically forms colonies, biofilms were described only rarely. Yeast colonies exhibit an organized morphological pattern characteristic of each particular yeast strain (Kocková-Kratochvílová, 1982). This work is focusing on morphology and differentiation of the S. cerevisiae colonies of common laboratory strains forming less structured colonies, and strains of the Σ1278b genetic background forming highly structured "fluffy" colonies. It shows that polarized budding pattern and especially cell ability to form aggregates enable development of structured morphology. During development of "fluffy" colonies two differently regulated events of dimorphic switch from yeast form to filamentous growth occur. One of these events is dependent on the surface glycoprotein, Flo11p flocculin. This...
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Using A/B testing and multivariate testing to increase web profitability
Pajskr, Josef ; Sklenák, Vilém (advisor) ; Benda, Lukáš (referee)
This text concerns methods of parallel quantitative testing of web pages in order to increase their profitability. These methods bring new possibilities and overcome drawbacks of their ancestors. This work deals in detail with preparation, execution and result evaluations of quantitative tests. In chapters concerning test preparation this text describes the right technique of hypothesis formulation and selection of method for their verification. Text continues with description of tools available for conducting quantitative testing. Following chapters contain set of best practices and suggestions for successful testing. In its practical part, the text proves benefits of these methods by results interpretation of two successful tests conducted on a real e-commerce project and corporate website. Practical part also describes technical aspects of conducted tests in detail.
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Motivation and Organizational Culture as a Component of the Corporate Strategy
Nováková, Markéta ; Dvořáková, Zuzana (advisor) ; Kleibl, Jiří (referee)
This thesis deals with the analysis of corporate culture and incentive system at Unicorn Systems, a renowned European company providing comprehensive IT systems and solutions in information and communication technologies. The primary objective of this analysis is to determine the state of the corporate culture and to evaluate whether its condition is beneficial to determine the state of the corporate culture and to eveluate whether its condition is beneficial to the company. The key methodology used in the work are methods of 7S and OCAI (Organizational Culture Assessment Instrument). In order to achieve this objective, a survey was conducted to canvas the opinions of respondets (N = 25) from the company regarding their perceptions of the existing organisational culture, their preferences regarding the organisational culture within the company, and finally the organisational commitment. The conlusion revealed weaknesses in the corporate culture by synthesis using findings from the questionnaire survey, interviews, best practise in the field and also the theoretical background are drawn up recommendations for managerial practise.
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Production capacity and quality of silage corn silage hybrid selection of appropriate
SMAŽÍK, Jaroslav
The aim of this study was chosen for the field of observation should be hybrids of maize (Zea mays L.) for silage purposes from a wider set of hybrid genotypes. To evaluate the vegetation was established as a pilot experiment. Of this group were then selected 14 genotypes, which would satisfy most practical requirements. During the vegetation was monitored by formation of quantitative indicators required for silage maize hybrids. Before harvesting of collection of plants chosen for individual analysis of quantitative indicators, while processing the silage mass in laboratory conditions to evaluate selected quality indicators. When harvesting was imposed on the total yield of green and dry matter, dry matter content and proportion of buds on the plant.
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Zone of the grey information
Pejšová, Petra
To, co se nezveřejní, ani Google o tom neví. Výzkumné zprávy, vysokoškolské práce, příspěvky z konferencí a další odborné materiály jsou sice vydávány, ale dostane se k nim pouze úzká skupina uživatelů. Toto se snažíme změnit. Hledejte na www.nusl.cz .
Slides:  PDF
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Pyrolysis Gasoline Hydrogenation in Trickle Bed Reactor with Periodically Modulated Feed Rate.
Tukač, V. ; Hanika, Jiří ; Chyba, V. ; Handlová, M. ; Sazanov, Z. ; Lederer, J. ; Kolena, J. ; Jiřičný, Vladimír ; Stavárek, Petr ; Staněk, Vladimír
The effect of feed rate modulation on efficiency of pilot plant trickle bed reactor during pyrolysis gasoline hydrogenation using palladium supported catalyst was investigated. Enhancement factors for unsaturated hydrocarbon components were evaluated from experiments made both in steady state and dynamic operation modes. Feed rate modulation mode prefered hydrogenation of minority components of the feed.
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