|
FE heat conduction modeling of Rubber segment at mechanical harmonic excitation
Šulc, Petr ; Pešek, Luděk
This contribution deals with the numerical finite element modeling of rubber sample temperature field at the harmonic mechanical loading when the heat generated by absorbed mechanical energy is substituted by the constant heat rate input. As the study case a segment of the rubber-damped railway tram wheel was chosen. This segment was experimentally tested and the results were used for tuning the parameters of the FE model of heat conduction and transfer in program ANSYS 6.1.
|
|
Methodology of overweight reduction for women after childbirth.
ŠULCOVÁ, Veronika
The overweight or even the obesity of women usually begins at the time of pregnancy. It often continues after the childbirth. A lot of women are never not able to reduce their weight to the value before their pregnancy. Overweight and obesity are not only a beauty problem but there are much more serious complications that can shorter the lifetime. Women with overweigh or obesity should try to reduce their weight. The good solution is a receiving a balanced diet with a reasonable energy value and regular movement activities. This thesis is based on the creation of three-month yoga programme for women after childbirth. These women managed to reduce the weight of three kilograms on average. This programme also had a good impact on all health of these women.
|
|
Odezva stopového LET spektrometru k vysokoenergetickým protonům
Jadrníčková, Iva ; Spurný, František
Risk from ionizing radiation depend both on the radiation quantity and the radiation quality.The radiation quality is characterized by the methods and the procedures of microdosimetry. Basic experimental microdosimetry approach is based on the use of tissue equivalent proportional counters. However, in some cases their use can be compromised, for example at high dose rates and/or in the presence of very intense low LET component in the radiation field to be characterized. For such purposes, the microdosimetry method based on a polyallyldiglycolcarbonate (PADC) chemically etched track-etch detectors (TED) was developed
|
|
The Conversion Efficiency of Different Kinds of Energy into Electrical Energy and the Possibility of its Accumulation
Ostruška, Jan ; Bartošík, Tomáš (referee) ; Macháček, Jan (advisor)
The thesis deals with the issues of the conversion efficiency of different kinds of energy into electric energy. Firstly, the thesis presents a brief introduction into types of energy sources and their capacity. Then, conversion efficiency of particular direct and indirect conversion is scrutinized, pointing to factors which affect conversion efficiency. The next chapter deals with the possibilities of accumulating electric energy. These are analysed as far as conversion efficiency is concerned as well and the end of the chapter concludes with comparison of these particular possibilities. Booth parts of the process – power generation and its accumulation – are connected in comprehensive scheme of energy conversions. The thesis develops on this scheme by mathematic description of its components and by designing a simulation programme, which would show the flow of energy in the scheme.
|
|
Evaluation of Nutrition Uptake, Macro and Micro Elements by Pregnat Czech Women
Sovišová, Petra ; Hronek, Miloslav (advisor) ; Herink, Josef (referee)
THE EVALUATION OF NUTRITION UPTAKE, MACRO AND MICRO ELEMENTS BY PREGNANT CZECH WOMEN Department of Biological and Medical Scientes, 2010 Petra Sovišová Nutrition of pregnant women is a very important factor in physiological pregnancy and healthy fetal development. Presented rigorous thesis which follows my own diploma thesis "The evaluation of dietary intake substrates and nutrient in prenancy", defended in 2008. The aim of both thesis was to determine the nutritional evaluation of a control group of pregnant women specific nutritional intake of energy, nutrients, selected vitamins and minerals in nowadays conditions. Testing was conducted through a weekly record of all food received by a group of pregnant women randomly selected from the second trimester of pregnancy, different ages and education, where was assumption in diversity of their food habits. In this thesis, however, I proceed from the evaluation results of extensive group of 150 women. Data processing was carried out by using computer program NutriDan. In the theoretical part of my diploma thesis, I examined closely the particular intake of selected nutrients - that is, lipids, carbohydrates, protein and total energy intake during pregnancy, while the theoretical part of my rigorous thesis deals with a specific macro-and micro elements...
|
|
An advancement of heating plants system in Brno
Brabec, Vít ; Lízal, František (referee) ; Jaroš, Michal (advisor)
The content of this bachelor’s thesis is the examination of the advancement of heating plants system in Brno. The first part of the thesis introduces a brief overview of an eighty-year history of heating industry in Brno from the first ideas up to the current state. Next part closely describes the individual plants and the system of centralized heat supply. The last section compares heat supply through steam and hydrothermal pipe-line and its influence on the combined production of heat and electrical energy.
|
|
Diffusion parameters of brain tissue during ischemia and during status epilepticus
Šlais, Karel ; Syková, Eva (advisor) ; Otáhal, Jakub (referee) ; Rokyta, Richard (referee) ; Dezortová, Monika (referee)
Difusion of neuroactive substances in the extracellular space (ECS) is constrained by two factors: extracellular space volume and geometry. We have shown changes of diffusion parameters and extracellular concentrations of energetic metabolites and glutamate in two pathological states accompanied by significant ECS volume changes - in combined hypoxia/ischemia and in status epilepticus. In the model of hypoxia/ischemia, we have shown time courses of diffusion parameters, concentrations of glucose, lactate, lactate/pyruvate ratio and glutamate during hypoxic/ischemic insult and after reperfusion. The time course of glutamate extracellular concencetration in transient hypoxia/ischemia correlated well with time course of changes in diffusion parameters. The decrease in the ECS volume fraction can therefore contribute to an increased accumulation of toxic metabolites, which may aggravate functional deficits and lead to damage of the central nervous system. In the model of pilocarpine-induced status epilepticus our results show changes in the extracellular space diffusion parameters, K+, energy-related metabolites and glutamate during the initiation and first hours of the propagation. Our results also show that the first minutes after a pilocarpine injection are followed by an increase in extracellular K+ and a...
|
|
Adipose tissue and its role in development of insulin resistance and systemic inflammatory reaction
Roubíček, Tomáš ; Haluzík, Martin (advisor) ; Stárka, Luboslav (referee) ; Housa, Daniel (referee)
Hyperglycemia and insulin resistance are tightly interconnected pathophysiological conditions that increase the risk for development of cardiovascular diseases. Our current knowledge indicates that one of important reasons leading to the development of insulin resistance could lies in a dysfunction of adipose tissue with subsequent ectopic lipids accumulation in muscles and liver. Adipose tissue represents the main body storage site of energy. Furthermore, adipose tissue is also an active endocrine organ producing numerous biologically active molecules, e.g. cytokines, proinflammatory or to a lesser degree anti-inflammatory factors or components of the renin-angiotensin-aldosterone system. Some of the components of the local renin-angiotensin-aldosterone system produced by the adipose tissue can directly induce local insulin resistance within the adipose tissue. Hyperglycemia and insulin resistance are also common in critically ill patients and exaggeration of insulin resistance in these patients is accompanied by increased morbidity and mortality. Our previous study has demonstrated that adipose tissue plays an important role in the development of hyperglycemia and insulin resistance in critically ill patients by production of numerous proinflammatory cytokines. First part of this dissertation thesis is...
|
| |
|
Nitrile hydrolysing enzymes: Fungal nitrilases
Vejvoda, Vojtěch ; Martínková, Ludmila (advisor) ; Wimmer, Zdeněk (referee) ; Vosáhlová, Simona (referee)
Charles University in Prague Faculty of Science Department of Biochemistry A thesis submitted for the degree of Doctor of Philosophy Nitrile-hydrolysing enzymes: Fungal nitrilases Mgr. Vojtěch Vejvoda Supervisor: Ing. Ludmila Martínková, CSc. Laboratory of Biotransformation, Institute of Microbiology, v.v.i. Academy of Sciences of the Czech Republic Consultant: Prof. RNDr. Karel Bezouška, DrSc. Faculty of Science, Department of Biochemistry, , Charles University in Prague Prague 2010 INTRODUCTION Nitriles are widespread in the environment - not only as the natural products of plants but also as the secondary metabolites of microorganisms or higher organisms. Synthetic nitriles and inorganic cyanides occur as pollutants from human activities (industrial wastes, herbicides, etc.). Both natural and man-made nitriles are poisonous to many organisms, the natural ones serving as a protection against enemies (e.g. herbivores). Their toxic activity is used in some herbicides. However, all of these compounds may exert negative effects on other beings living in the particular environment and create selection pressures, probably leading to the evolution of enzymes catalyzing the detoxification of nitriles, or, even better, utilizing them as the source of energy and nutrients. Nitrile-metabolizing enzymes are...
|
guest ::
