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Advanced ceramics for tissue engineering
Vojtíšek, Jan ; Koplík, Jan (referee) ; Bartoníčková, Eva (advisor)
This bachelor´s thesis deals issues of ceramics materials suitable for tissue engineering. An artificial substitute for human tissue can be divided to several generations. This include inert, bioactive and bioresobable materials. Resorbable substitutions are prepared from materials, which could substitute host tissue, for example hydroxyapatite. HA can be prepared in different ways (dry and wet way). To better application in medicine, ceramics foams prepared by in situ foaming or replication technique are using. Experimental part of this paper deals preparing of hydroxyapatite powder and process optimization. Samples was characterized by IR and Raman spectrometry, XRD analysis and particle size was studied by SEM. Ceramics foams was prepared by in situ foaming from Al2O3, HA and composites (in ratio 50 – 50, 75 – 25, 90 – 10). Porosity was evaluated by stereomicroscope, density and level of sintering was studied by SEM microscopy.
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Teaching-space paradigm
Kolomazníková, Pavla ; Vojtíšek, Jan (referee) ; Rozwalka, Szymon (advisor)
The main task of the project is moving the faculty of architecture to other place because of inconvnient requirements for the future education of students. The new Faculty tries to create a new space for students, which can offer them different types of communication, enough flexibility,, diversity of the space itself it gives them an opportunity to become the real part of the space.
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Teaching-space paradigm
Bernátek, David Erik ; Vojtíšek, Jan (referee) ; Rozwalka, Szymon (advisor)
The aim of the bachelor thesis is a study of a new building for the Faculty of architecture BUT in Brno in the area of the BUT university on Udolni. At present, the Faculty of architecutre is located on Porici in a building, which with its spatial possibilities no longer meets the current requirements for teaching architecture and does not offer possibilities of necessary changes. The introductory part of the work is devoted to determining the spatial needs for teaching architecture in the 21st century. Further the project deals with the incorporation of the new building of the Faculty of architecture into the complex in terms of urban planning and its subsequent architectural solution.
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Hydroxyapatite based ceramic composites
Vojtíšek, Jan ; Ptáček, Petr (referee) ; Bartoníčková, Eva (advisor)
This work was focused on the study of hydroxyapatite based bioceramic materials. These materials are generally very important for medical purposes, especially in the reconstruction and replacement of bone material. For medical applications, inert, bioactive or bioresorbable materials can be used. One of the common "bioactive" materials is hydroxyapatite, which forms a large part of human bone. Hydroxyapatite can be prepared by a wide variety of procedures, one of the most common methods is the precipitation reaction used in this work. To improve the biocompatibility of the bone replacement, porous structures with adequate mechanical stability are used. For the initial study of simulation of the behavior of biomaterials in the human body, called in vitro tests are used in solutions based on synthetic body fluids or cell media. The experimental part deals with the synthesis of hydroxyapatite powder and CA phase composite compounds. The reactions between the individual components were studied by thermal analysis and heat microscopy. The resulting products were analyzed for phase composition by X-ray diffraction. The prepared powders were further processed on foam structures by in situ foaming and sintering at a suitable temperature. In vitro tests, following the behavior of the prepared porous products in the synthetic body fluid, were performed for 7, 14 and 28 days. The monitored composites were then studied for biocompatibility by scanning electron microscopy. At the same time, the change in the concentration of Ca2+ and PO43- ions in the body fluids tested was monitored.
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Professional respondents in research panels: comparing trained and fresh members of an on-line panel
Vojtíšek, Jan ; Remr, Jiří (advisor) ; Jeřábek, Hynek (referee)
Professional respondents in research panels: comparing trained and fresh members of an online panel The diploma thesis deals with the topic of changes in responding of research panel members, which are caused by their previous experience with research process. Various manifestations of this phenomenon, often labelled as the "panel conditioning effect", are described and supported by corresponding empirical evidence. The observations of panel conditioning effect come from longitudinal panel design as well as online access panels. The author proposes logically structured differentiation of the effect. Based on this categorization, several hypotheses about the differences between trained and fresh members of an Internet panel are raised and tested in dedicated online research. The results reveal significant differences between recently-registered and long-term members of the panel, both in their response strategies and in demographic structure of the groups. Yet the overall outcome do not indicate, that interviewing trained respondents would necessarily lead to lower-quality data.
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Karstification of carbonato-silicate rocks: review of literature and leaching experiments
Vojtíšek, Jan ; Bruthans, Jiří (advisor) ; Kůrková, Iva (referee)
The process of karstification doesn't occur only in easily soluble rock, such as limestone and evaporites, but also occurs in other rocks such as quartzites or siliciclastic rocks with carbonate cement. The "ghost rock" karstification is, unlike the classical karstification, two- step process, where the soluble component are dissolved first and subsequently the insoluble components are eroded and flushed away. These processes also occur in the Czech Republic, for example in the Bohemian Cretaceous Basin (BCB). Practical part of this thesis consists of leaching experiments of samples from BCB. Leaching in hydrochloric acid is an accelerated simulation of natural processes of dissolution by acidic solutions. Leaching of the samples in acid led to the decrease of sample strength, sometimes to their desintegration. The samples are probabbly prone to the evolution of karst conduits. Leaching experiments showed that the carbonate content is an important but not the only driving factor in the karstification process.
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Testaments and Testamentary Practices in Kolín Municipal Books 1376-1401
Vojtíšek, Jan ; Žemlička, Josef (advisor) ; Doležalová, Eva (referee)
The subject of the thesis are testaments conserved in Kolín municipal books dating to the period of 1376 and 1401. The last wills are analysed from the juridical and administrative point of view as well as the perspective of the studies of medieval religiosity. The aim of the thesis is to show the role and function of the testament in hereditary practices in the royal town od Kolín at the end of the 14th century. The list of the testaments with the date, reference and a brief characteristic plays an integral part of the study.
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Teaching-space paradigm
Kolomazníková, Pavla ; Vojtíšek, Jan (referee) ; Rozwalka, Szymon (advisor)
The main task of the project is moving the faculty of architecture to other place because of inconvnient requirements for the future education of students. The new Faculty tries to create a new space for students, which can offer them different types of communication, enough flexibility,, diversity of the space itself it gives them an opportunity to become the real part of the space.
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