|
|
Isolation of active substances with antioxidative properties from lignocellulosic waste
Jurová, Karolína ; Vítová, Eva (referee) ; Kovalčík, Adriána (advisor)
This thesis focuses on isolating active substances with antioxidant properties from lignocellulosic wastes. This work aimed to modify bacterial cellulose (BC) with extracts from grape pomace, which show high antioxidant activity. Grape pomace belongs to the group of lignocellulosic wastes with high content of bioactive compounds such as polyphenols, which contribute significantly to antioxidant efficacy. This work tested the hypothesis that grape extracts can provide antioxidative efficiency to BC. Grape pomace extracts were prepared from grape pomace frozen and lyophilized using a 70% acetone, a 70% ethanol or a 50% ethanol solvent. The highest values of antioxidant activity were determined for the lyophilized extract prepared by extracting grape pomace with 70% acetone. The extracts were further used to modify bacterial cellulose in the form of films (dry BC) and hydrogels (wet BC). It was shown that both forms of BC could be effectively modified using grape pomace extracts, but BC hydrogel achieved higher antioxidant activity compared to BC film. Furthermore, BC with antioxidant activity can be used in various food, cosmetics, and medicine applications.
|
|
|
Development of natural cosmetics emulsions with encapsulated active substances
Chrápavá, Edita ; Dzurendová, Simona (referee) ; Márová, Ivana (advisor)
In recent years, there is a increase of consumer interest in products, which in some way help a more favourable ecological sustainability, whether it is a reduction of emissions during mass production, easier breakdown of chemicals in wastewater, or harmlessness of products and ingredients from which products are made. This topic also affected the cosmetic industry in a big way, and they were thus forced to start adapting not only smaller brands of natural cosmetics, but also large companies. As a result, bigger companies started to pay more attention to research of natural substances for cosmetics and the development of natural alternatives to synthetic ingredients. At the same time, there is also increasing interest in the effects of Eastern medicine mushrooms and their beneficial effects on both physical and mental health. This thesis focuses on the connection of these two topics, the analysis of plant extracts and extracts of medicinal mushrooms on one side and their potential cosmetic use on the other. Subsequently, a cosmetic product was designed made from ingredients of natural origin with encapsulated extracts from these natural ingredients as active substances
|
|
|
Koprivnice 3.0 - Housing A++
Bubeníková, Zuzana ; Rusín, Tomáš (referee) ; Nový, Vítězslav (advisor)
This diploma thesis is aimed at the strategic plan for new use of a plot owned by the town of Kopřivnice, which formerly accomodated exterior handball courts with adjacent facilities and a restaurant, the so-called “Házeňák”. The design follows up the pre-diploma project, which analyses the building theory of socialist urban planning, precisely regarding the zoned city and its influence on the form of the town Kopřivnice as well as the life of its inhabitants. The master planning of the choosen plot relies on the alternation of free urban space and buildings of adequate scale, which respects the existing restaurant building. The typology of the designed buildings combines administration, commercial ground floor and residential floors with the access to roof terraces. The detail of the choosen development strategy is demonstrated on the design of an apartment building which implements the “Baugruppe” construction model consisting of twelve model households. The individual requirements of these households are reflected in the separate layouts of the apartments. The materiality of this apartment building reacts to the observation of the surrounding development and an unmistakeable character of the town. The design of the facade also takes into account the individuality of the households and dynamically reacts to the life in the new neighborhood.
|
|
|
Zlín FCK Technology
Kučera, Petr ; Pecka, Lukáš (referee) ; Štěpán, Marek (advisor)
The diploma work deals with the design of a residential building in the town of Malenovice u Zlína, where a new residential complex is to be built on the site of the former Malenovice sawmill. The land is located in close proximity to the main road to Zlín. The work proposes a modular house system made of prefabricated CLT elements with social and community overlap. A system that allows rapid construction and creation of buildings with different configurations according to the given requirements not only in the territory of Malenovice. The design system includes small-scale flats with elements of variable furniture, which allows to reduce the cost of housing, which is responding to the current unaffordable housing, but maintaining human comfort. The design also addresses the efficient use of technology on site and its sometimes excessive use.
|
|
|
The influence of admixtures on the hydration of Calcium Aluminate phases
Skalík, Martin ; Másilko, Jiří (referee) ; Koplík, Jan (advisor)
This thesis focuses on the effect of admixtures on the hydration time and on the formation of hydration products of calcium aluminate cement and its phases. Three main calcium aluminate phases, CA, CA2 and C12A7, were prepared to study using a high temperature sintering method that was optimised to be as fast as possible. The admixtures used were LiCl, NaCl, sodium tetraborate and citric acid. Prior to the actual hydration, the optimization of the admixture dosage was performed by Vicat test on two commercial aluminate cements, Secar 71 and Secar 80. The hydration with the right amnout of admixtures was monitored by heat flow calorimetry. Hydration products were investigated by X-ray diffraction analysis, Fourier transform infrared spectroscopy and electron microscopy.
|
|
|
Effect of substrate and geometry on the size of the anomalous Nernst phenomenon
Golub, Dmitrii ; Zázvorka,, Jakub (referee) ; Čech, Vladimír (advisor)
Anomální Nernstův jev se týká vzniku příčného napětí v magnetických materiálech při aplikovaném podélném teplotním gradientu. Tento jev slibuje aplikace v oblasti spinové kaloritroniky a zlepšené konverze tepelné energie. Zde jsme zkoumali vliv substrátu vzorku a experimentální geometrie na anomální Nernstův jev ve vzorcích tenkých filmů permaloye napařených na substrátech. Provedli jsme studii anomálního Nernstova jevu na vzorcích s čtyřmi různými substráty s podstatně odlišnou tepelnou vodivostí. Kromě toho jsme testovali čtyři různé techniky generování teplotního gradientu ve vzorcích: tři metody pro generování gradientu v rovině a jednu metodu pro generování gradientu mimo rovinu. Pozorujeme, že tepelná vodivost substrátu významně ovlivňuje velikost teplotního gradientu. V dvou konfiguracích v rovině jsme naměřili konzistentní koeficient anomálního Nernstova jevu, gradient teploty mimo rovinu byl odhadnut na základě získaných dat.
|
|
|
Interactive architecture
Müller, Tomáš ; Stavric, Milena (referee) ; Kaftan, Martin (advisor)
Interactive architecture The world today is constantly dynamically changing. Along with the world, the environment in which people live is changing as well. Architecture, which has been focused on improving and enhancing the surrounding environment for the benefit of mankind since the beginning of humanity, now has the opportunity to come to life and become interactive thanks to technological advancements. Interactive architecture, which dynamically adapts to changing conditions and human needs, can lay the foundation for a robust and adaptable solution that could contribute to more resilient and sustainable architecture in the future. In this work, the use of contemporary digital design techniques will allow the potential of the ancient art of origami - the art of folding paper - to be combined with today’s technology. Thanks to this connection, it is possible to create architecture that will be able to change and adapt to various human needs. This thesis focuses on the digitisation of origami, the development of structures inspired by the Miura origami pattern, the transition from paper shells to kinetic movable shells, and the development of a digital tool capable of designing and controlling the behaviour of interactive shells. The behaviour of the interactive components will be tested through digital simulations.
|
|
|
The Ideal City Trenčín: The new Train and Bus Station
Holbová, Natália ; Petruš, Lukáš (referee) ; Kratochvíl, Jan (advisor)
The diploma thesis is based on a pre-diploma project, which focused on analysing the city of Trenčín. The analyses and the questionnaire showed what the city lacks and what the city excels in. This was followed by the selection of one specific problem. By solving my chosen problem, the city would come closer to being ideal. I focused on the train station and its surroundings. This was due to the negative responses in the questionnaire I created and in the available online analyses of the city. I also included its surroundings in the design for a better revitalisation of the place. The proposal itself is in the spirit of respect for the place and resolving the problematic state of the place. The aim is to replace the inappropriate existing buildings with new ones that will add to the functionality of the site.
|
|
|
Working on updates!
Vašáková, Iva ; Pajgrtová, Marika (referee) ; Mléčka, Jan (advisor)
How to work with school buildings that have been standing here for many years and are designed in the style of teaching from the last century? How to respond to a time when the approach to both the education of teachers themselves and to teaching itself is rapidly changing? I perceive that the layout of most of today's school buildings lags behind the requirements of current teaching styles. School management is trying to deal with this problem, but despite the efforts they put into it, these spaces still play the role of backdrops in teaching. I think that the school building itself should be a creative and stimulating environment that provides a helping hand to teachers in teaching and children in their development. The diploma thesis follows on from the pre-diploma project, in which I research topics related to the issue of school teaching and its environment. It is about the development and functioning of modern approaches to teaching, their requirements for space, developmental psychology and understanding the context in the construction of school buildings in the Czech Republic from the 16th century. to present. In conclusion, based on research and analysis, I define the principles that I try to apply in my diploma thesis to a specific proposal for the reconstruction of a school building from the 1980s.
|
|
|
Alternative crosslinking methods for sodium alginate resulting in hydrogels with suitable application properties
Kouřilová, Ludmila ; Kráčalík, Milan (referee) ; Smilek, Jiří (advisor)
This diploma thesis is focused on the preparation of alginate gels with the potential to influence their final application properties (transparency, syneresis, viscoelastic properties, etc.). Based on literature review, a total of three gelation strategies leading to the gelation of sodium alginate were selected, namely ionotropic gelation by external gelation method, ionotropic gelation by internal gelation method, and alginate crosslinking with phytic acid, which is capable of forming both ionic bonds and intramolecular hydrogen bonds. Subsequently, the preparation of alginate gels was optimized, their mechanical properties were characterized, and finally, the influence of several factors (polymer concentration, amount of crosslinking agent, gelation time, addition of sucrose, etc.) on the resulting properties of the prepared gels was monitored. Within the scope of the thesis, it was demonstrated that the resulting properties of sodium alginate-based gels are influenced not only by the polymer concentration, the amount of crosslinking agent used, gelation rate, or syneresis, but in the case of ionotropic gelation by external gelation, for example, also by the type of anion used. An interesting part of the thesis is also the optimization of determining the mechanical properties of alginate gels through compression tests. During these tests, the sample is compressed between two rheometer sensors, and the mechanical response of sample to the applied force is measured. It is one of the most easily conceivable rheometric tests.
|
guest ::
RSS feed.