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Dynamic analysis of tall slender structure equipped with passive absorber and founded on various subsoils using simplified model
Hračov, Stanislav
The paper is focused on the investigation of dynamic behavior of tall slender structures taking into account the soil-structure interaction effect (SSI) and a presence of a tuned mass damper (absorber). The main aim is to qualitatively and quantitatively assess effects of both phenomena on changes in basic dynamic properties and response of the structure. The real tower equipped with absorber is chosen and analyzed. Analytical and numerical analysis of modal properties and of the response of a simple discrete model are performed. The structure and absorber are represented by one degree of freedom, the interaction interface by spring-dashpot system. This simplified model together with multi degree of freedom discrete model is analyzed parametrically for different dynamic properties of subsoil to cover all possible dynamic effects. The influence of neglecting of both phenomena is quantified and suggestions for assessments of such a type of structures are proposed.
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Software System for Universal Functional Optimization
Lukšan, Ladislav ; Vlček, Jan ; Tůma, Miroslav
The universal functional optimization (UFO) system is an interactive modular system, which contains 30 classes of optimization methods for solving various types of standard and large-scale optimization problems. We give a brief description of this system together with most important optimization methods. Furthermore, we show typical applications os this system to solving industrial problems.
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The role of ultraviolet light in communication of birds
Šulc, Michal ; Sedláček, Ondřej (advisor) ; Albrecht, Tomáš (referee)
Recently, it has been found that the visual system of birds and humans differ remarkably, especially in the ability to perceive ultraviolet radiation. This component of the spectrum significantly affects various types of the birds' behaviour. UV reflection may be an indicator of the qualities of males, i.e. females often prefer individuals with expressive UV ornamentation. Likewise, parents can distribute the delivered food unevenly among their nestlings, depending on the nestlings' reflection of ultraviolet radiation. Recent studies also showed that the hosts of brood parasites may use UV spectrum as a key for recognizing the parasitic eggs from their own. The aim of my bachelor thesis is to review the current knowledge of the influence of UV radiation on sexual selection of birds, the interaction between parents and offspring and interactions between brood parasites and their hosts.
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Contemporary methods of treatment of injuries and their complications in immature permanent teeth in children
Tzigkounakis, Vasileios ; Merglová, Vlasta (advisor) ; Nováková, Květoslava (referee) ; Gojišová, Eva (referee)
This study deals with the evaluation of endodontic treatment using calcium hydroxide materials in immature permanent teeth that have sustained traumas, especially after severe periodontal tissue injuries. - The aim of this work was: a. to analyze the factors that contribute to occurrence of post-traumatic complications, especially after avulsion injuries in immature permanent teeth , b. to investigate the effectiveness of endodontic therapy of these complications with the use of calcium hydroxide materials in immature permanent teeth, c. to evaluate various calcium hydroxide materials, d. to compare our results with other studies in literature concerning calcium hydroxide properties in cases that it is used as an intra-canal medicament. - The pre-clinical and clinical parts of this thesis are divided in 3 parts: 1. Evaluation of primary schools teachers` knowledge on providing first aid in cases of tooth avulsion injuries: immediate and proper first aid and fast transfer of children to dental practitioner are determining factors for prognosis of the injured tooth and for future occurrence of post-traumatic complications. 300 teachers were asked to fill questionnaires about avulsion of permanent teeth. 69 % of the respondents had never been informed about providing first aid in dental trauma situations, 34 %...
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Comprehensive system of rehabilitation in younger individuals after stroke
BEČVÁŘOVÁ, Lucie
Title of the bachelor thesis is Comprehensive rehabilitation in younger individuals after stroke. The aim of this thesis was to determine the subjective perception of individuals´ needs after stroke. The theoretic part is divided into two main chapters. The first one contains brief information about the disease, its types, anatomy and physiology background and symptoms. The second chapter deals with the issue of comprehensive rehabilitation and its parts. Particular approaches are defined and described in detail, health professionals working in this area are also mentioned here. The research part was processed by a method of qualitative research strategy. Semi-structured interview technique and observation were used. The research set included 5 respondents - four men and one woman. Past history of stroke and age of individuals between 45 and 55 years were the inclusion criteria for this research. Interview was held according to scenario questions, where I focused on two areas. First section included information about the respondent, his disease and treatment in the way of comprehensive rehabilitation. In the second part, respondents were asked how their life had changed after the experience of stroke. The interview was audio-recorded and then verbatim transcribed. One of the respondents did not wish to be audio-recorded, thus written notes were taken during the interview. Interviewing results are presented in a narrative format. By conducting this research I tried to answer the following question: What are the needs of individuals at various stages of stroke recovery? Need of self-sufficiency was mentioned by all respondents. In early stage, it was mainly coping with basic activities such as food intake, control of excretion, verbal expression and movement. In the later phase of treatment, there are increasing demands on self-care, understanding ability, memory and social interaction. Individuals often went through an intensive therapy. After returning back to their home environment, the need of self-realization, activation and meaningful ways to spend a free time are the most significant issues. This work should provide more information on the given topic.
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Motivation and individual use of social networks, namely Facebook and Nyx and the identity of thein users: Qualitative comparative study
Šimáková, Lenka ; Švelch, Jaroslav (advisor) ; Vochocová, Lenka (referee)
Lenka Šimáková Způsoby a motivace užívání sociálních sítí Facebook a Nyx a identita jejich uživatelů: Kvalitativní komparativní studie Mediální studia, IKSŽ, FSV UK, 2012 Abstract The key goal of this thesis is to find correlations between motivation and usage of social network(ing) sites and how they influence self-presentation of the users as a process of defining their own identity. A qualitative method of semi-structured interviews with five active users of both researched sites was used to describe the impact of the social and technological environment on the way they present themselves towards others. I therefore focus mainly on the social identity of the users: why and how they interact, how they perceive the sites and their role within their groups and how it influences their administration of their personal profiles. I also focus on other relevant subjects of within-line social communication: I describe various aspects of computer mediated communication, user perception of public and private sphere on-line and other issues such as group dynamics or users' approach to the social network(ing) sites as tools for managing their social capital. The resulting set of hypothesis is based on my analysis of the conducted interviews. This thesis brings an insight into user reflection of researched platforms,...
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Secondary minerals origined on burning coal waste piles in selected coal basins in the Czech Republic
Martinec, Petr ; Klika, Z.
In this paper the existence of coal waste pile have been divided into various stages. Four of these stages (A, B, C and D) belong to stage of coal waste pile heating. Whereas stage A run at the ambient low temperature the stage D run at very high temperature (above 900°C). The fifth stage E follows cooling period and sixth stage F interaction of coal waste pile with injected material that is added to burning coal waste pile in order to decrease its temperature. Each stage is characterized by various condition at which new secondary minerals are formed. Some of them are typical just for related stages of coal waste pile existence.
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Analysis of the relationship between interest rate and exchange rate within boarders of a small open economy
Brigant, Michal ; Mandel, Martin (advisor) ; Kučera, Lukáš (referee)
Primary objective of this thesis was to analyse the relationship between exchange rate and interest rate within borders of a small open economy. Different theoretical approaches often present us with various, sometimes even opposing conclusions when it comes to the matter of direction and intensity of the causal influence between these two variables. From author's point of view it is important to perceive the interaction between exchange rate and interest rate as a dynamic process rather than a static relationship. The empirical analysis was conducted on monthly time series (2000-2012) of three selected small open economies -- Poland, Hungary and Czech Republic. Graphical analysis, linear regression, vector autoregression and cointegration analysis were selected as suitable tools for meeting the objective of this thesis. Models themselves presented us with interesting conclusions, for example a proof of the international Fisher effect, exchange rate causally affecting the interest rate (interest rate differential) in case of spot rates against euro. Another curious phenomena was the inflow of foreign debt capital, which, as it seems, was actually pulling the exchange rate down rather than pushing it up due to rising indebtedness of the economy.
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