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Volumetric model of human vocal folds
Vampola, T. ; Horáček, Jaromír
The article describes the vollumetric 3D FE model of real human vocal folds in a defined phonation position. The model was developed from the CT images of the plaster casts obtained by a special procedure during experiments with the excised human larynges, when the phonatioon caused by the airflow was suddenly stopped without changing the position of the fixed larynx. The model is determined for studies of dynamical stresses in the vocal fold tissue during vocal folds collisions.
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Contacts betweeen family and school on elementary school
Lívancová, Šárka ; Hadj - Moussová, Zuzana (advisor) ; Viktorová, Ida (referee)
Diploma thesis discusses the communication between family and teachers, especially the specific aspects of this interaction considering small schools. The communication between parents and teachers is one of the important parts of coordination of parents and school. Communication can be divided into direct, represented by f a c e - t o - f a ce contact between parents and teachers, and indirect, which comprise telephone conversation and other messages delivered by the pupils. This t h e s i s focuses on the direct type of communication. It aims to describe s p e c i f i c forms of direct communication in context of s p e c i f i c traits of r e l a t ed environment. We assume, that the village environment, which is common for small schools, doesn't suffer of anonymity of large cities, and that people in this environment generally have closer contacts with each other. Small schools are schools for 6 to 11 years old, o f f e r i n g only the primary level of education, for which the higher rate of p a r e n t - t e a c h e r i n t e r a c t i o n is typical. In these small schools, the primary education has the p o s s i b i l i t y to preserve i t ' s autonomy, and it i s n ' t influenced by the secondary level education, which appears to be dominant, when the both levels are combined. Last but not least...
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Animals in the looking glasses of Europe and India. The changing bonds between humans and animals in the course of the 19th and 20th century
Nováková, Hana ; Komárek, Stanislav (advisor) ; Marková, Dagmar (referee) ; Cílek, Václav (referee)
This paper deals with various aspects of human- animal relationship: biological, psychological and sociological; but also with the fact how deep and thorough impact can political events have on the paradigma pointed towards animals. Here, these are depicted on significant fields of human - animal interactions of modern times, for example zoological gardens, petkeeping, changing ways of hunting, and also within some more obscure phenomena, such as animal abuse in laboratory research and in "meat plants". I also try to trace the roots of the approach that people of modern time Europe perform towards animals, and I do the same for India. The writing is divided into two parts, each one containing four chapters. The part No. I. - The man and the animal in Euro-American cultural context - describes the turbulent changes the human - animal relationship underwent during the era of Enlightenment, and tries to explain why it was so. Animals have enjoyed a widespread interest since times immemorial, but have hardly ever been perceived from the tabula rasa point of view. On the contrary, they have often been seen through the prisma of human sociology, serving as the immense field of manifold human projections. As such, they have figured in copious kinds of modern "myths", being it myths of ritual or otherwise "fictive"...
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Dynamic behavior od rotor dynamics system vibrating in a liquid
Kučera, Martin ; Pohanka, Lukáš (referee) ; Malenovský, Eduard (advisor)
This thesis deals with dynamic behavior of rotor dynamics system vibrating in a liquid. Work is factually oriented on influence of the liquid to natural frequences of rotor of vortex turbine. There is described the creation of geometric and computational model of the system and the results of natural frequences and damping in dependence on environment are presen-ted. There are compared variations in natural frequences of the rotor system, which are caused of the interaction of the various level of the water environment. The step of integration are tested and compared for choise solving method. Problem is solved by computational simulation in commercial software ANSYS 11.0 There is used software tools Multiphysics/FSI.
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Freezing technology of bull sperm in relation to its survivability and fertilization ability
Doležalová, Martina ; Stádník, Luděk (advisor) ; Jiří, Jiří (referee)
The aim of optimalization the insemination doses production is to provide the highest fertilization ability of spermatozoa during the demanding proces of processing fresh semen and its subsequent cryopreservation. Temperature changes causes spermatozoa damage during the cooling and freezing. Spermatozoa is exposed to cold shock and many others limiting factors, which leads to cell death and therefore to decline of fertilization ability of thawed insemination doses. For increasing spermatozoa resistance, exactly the plasma membrane resistance against cold shock was fraction of egg yolk LDL cholesterol (low density lipoprotein) at various concentrations into the comercially produced diluents added. It is believed that LDL acts possitively to plasma membrane and helps to maintain the fertilization ability of spermatozoa after thawing. Following step in the proces of insemination doses production is slow cooling of diluted semen and equilibration, when the straws are store at cooling box for 30 minutes to 240 hours. This period is necessary to penetrate of certain diluent components into the spermatazoa also maintain the balance between their intracellular and extracellular concentration. Also important is subsequent freezing temperature gradient of insemination doses. The most suitable freezing method is based on computer controlled temperature decline in freezing chamber which allows the precise control of ice crystals formation that could tear and kill the cell.
During 2012 to 2016 was repeatedly collected semen from the group of breeding bulls (n = 27, Holstein and Czech Fleckvieh breed) at AI centre. Semen which fulfill the standard entrance conditions in first step was evenly into several parts divided. For dilution the three types of comercially diluents AndroMed, Bioxcell and Triladyl with and without LDL addition were used. Into the diluents AndroMed and Bioxcell the concentration of LDL 4 %, 6 % and 8% into the dilent Triladyl 6 %, 8 % and 10 % was added. Diluted semen was filled into the glass capillares with volume 0,1 ml and temperature +4 °C. Subsequently the sample was placed to cold bath (0°C) for 10 minutes. Then the volume of capillare with physiological solution (37 °C) was mixed and for next 120 minutes was incubate. The effect of cold shock to proportion of live spermatozoa was evaluated by using Eosin and Nigrosine staining technique during heat test of spermatozoa survivability after spermatozoa heating and after 120 minutes of incubation.
The more suitable semen diluents which provide the higher spermatozoa resistance against cold shock were AndroMed and Bioxcell. Together the possitive effect of LDL addition into the diluents to lower decrease of proportion of live spermatozoa during heat test was found (P<0.05). The most suitable LDL concentration which had a favorable influence at spermatozoa resistance against cold shock was 6 % in diluent Bioxcell. Values of the proportion of live sperm were higher at the beginning of the heat test (+1.31% to + 3.2%) and after 120 minute incubation (+5.82% to +8.41%) compared to other diluents with and without addition of LDL.
In the next step the process of equilibration was optimized, is an important part of insemination doses production. The effect of the length of equilibration for subsequent fertilization ability of spermatozoa was evaluated using spermatozoa motility based of CASA and proportion of live spermatozoa after thawing and during heat survival test lasting 120 minutes (37 ° C). Suitable semen was diluted by comercially used diluent AndroMed based on soya lecithin, filled into the straws (0.25 ml), cooled and equilibrated in cooling box for 30, 120 and 240 minutes and freezed in programmable freezing box applying four types of freezing curves differing in temperature rate decline. There was used standard and by producer recommended 3. phase freezing curve, then 2. phase freezing curve, and 3. phase freezing curve with slower as well as rapid decline of temperature rate in freezing chamber, compared with standard freezing curve. The highest spermatozoa motility was found using 240 minutes of equilibration by +2.72% and +4.58% compared to other lengths of equilibration (P <0.05 to 0.01). The highest proportion of live spermatozoa was found using 120 minutes of equilibration (+6.87 % and +8.68 %). The highest average spermatozoa motility during heat test after thawing was achieved by using 2. phase freezing curve (from +2.97% to +10.37%, P <0.05), also in the proportion of live spermatozoa (from + 4.37% to +8.82%, P <0.01). When evaluating interaction between the length of equilibration and freezing curve (standard 3. phase and 2 . phase freezing curve), the highest average spermatozoa motility and proportion of live spermatozoa using 240 minutes of equilibration by both freezing curves was reached, there was no statistically significant differences. As well as, in all evaluated parts of this study the individual differences between ejaculate of bulls and within semen from one bull (P <0.05) as secondary effect were found.
To maintain good fertilization ability of semen during cryopreservation is necessary to increase the spermatozoa resistance against cold shock using addition of correct concentration of LDL into the commercially used diluents AndroMed and Bioxcell. Subsequently the fertilization ability of insemination dose is influenced by cooling, the length of equilibration and freezing. The length of equilibration 120 minutes and more as well as gentle way of freezing according to freezing curve, which ensures a gradual decrease of temperature in freezing chamber provided the higher average spermatozoa motility and proportion of live spermatozoa.
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Single particle analysis of size-segregated aerosol in Prague city center
Marvanová, S. ; Skoupý, Radim ; Kulich, P. ; Bendl, J. ; Hovorka, J. ; Machala, M.
Particulate matter (PM) is omnipresent pollutant in the ambient air known to cause cardiovascular and respiratory diseases (WHO 2004). Recently, outdoor air pollution and particulate matter in outdoor air pollution were classified as carcinogenic to humans, Group 1 (IARC 2015). Especially, ambient PM of aerodynamic diameter < 100 nm, ultrafine particles, appears to be of great importance due to its high specific surface area and high number concentration (Hughes et al. 1998). Ultrafine particles also easily enter and are being transferred in organisms, and interact with cells and subcellular components (Oberdorster et al. 2005). As the evidence of ultrafine PM significance increased, size-fractionated PMs sampled by various cascade impactors have been employed into the toxicological studies on cell cultures or isolated cells, using the organic extracts of size-fractionated PMs (Topinka et al. 2013, Topinka et al. 2015) or directly the size-fractionated particles (Becker et al. 2003, Ramgolam et al. 2009, Reibman et al. 2002, Loxham et al. 2013, Jalava et al. 2006, Thomson et al. 2015, Jalava et al. 2015). The aim of this study was to evaluate shape and composition of size-segregated aerosol particles, sampled by high volume cascade impactor, using electron microscopy and energy dispersive X-ray spectroscopy (EDX).
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Vliv charakteristik elektrických motorů na dynamické chování poháněných soustav
Půst, Ladislav
The more precise mathematical models of dynamic systems must contain also more exact description of source of excitations. The paper deals with the analysis of electric motors characteristics and of interaction of motor with limited driving power and excited system. The moment charcteristic M(xxx) of the motor introduces new nonlinear effcts into the whole system and causes more complicated responses.
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Interactive methods of adult education
Krepindlová, Kateřina ; Mužík, Jaroslav (referee) ; Kocianová, Renata (advisor)
Adults can be educated using different methods. A choice of a specific method depends on what an individual needs to learn. This thesis introduces interactive methods of adult education. Compared to other methods of education such as a standard lecture, methods mentioned above are rooted in experiential education and use play and experience to imprint acquired knowledge, abilities and skills in one's memory more deeply. Interactive methods of education are attractive, highly efficient and may act as a trigger to further development of an individual. The thesis presented addresses concepts such as experiential learning, a play as an important phenomenon focused on situation in Czech Republic, and relevance of a play to a child and subsequently to an adult. The thesis focuses on specificity of adult education developing particular play and non-play interactive methods of education in detail to enable a person to develop their potential and constituent social and personal skills.
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