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Data Backup and Data Storrages
Šulc, Ondřej ; Kratochvíl, Zdeněk (referee) ; Kříž, Jiří (advisor)
This thesis focuses on the design of the backup system for elementary school Humpolec, Hradská 894. Introduction deals with the theoretical knowledge of the subject. The following section analyzes the current status of the backup system, including the information about the network system. The third section contains my own solutions, suitable for this school, based on findings in the analytical part.
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Transport and Deposition of Aerosol in Human Respiratory Tract
Elcner, Jakub ; Kratochvíl, Zdeněk (referee) ; Volavý, Jaroslav (referee) ; Jícha, Miroslav (advisor)
One of approaches in treatment of respiratory system diseases is the use of drug particles suspended in air in the form of aerosol. It is a fast and non-invasive method for the delivery of medicine into tracheobronchial tree or bloodstream. Although the method of the medication dosage by means of inhalers or nebulizers is well known, the effectiveness of that approach is still an actual issue. A significant amount of drugs delivered with the use of the medication dosage never reaches its primary destination and the drugs deposit in antecendent areas of respiratory tract where their presence is not required. This thesis deals with a problem of the passage of monodisperse homogenous aerosol with micron-size particles through the upper parts of the respiratory tract. This work was created with the use of numerical simulations carried out by means of the finite volume method in the commercial code based on computational fluid dynamics. Turbulence was modelled using the Reynolds averaged Navier–Stokes equations with the two-equation eddy viscosity k-omega SST model. The main output of the thesis is the analysis of airflow in two respiratory regimes. Stationary and cyclic cases of the flow behaviour were considered and the validation of simulated results with experiments performed on similar geometries was carried out. Furthermore, the review of simplified lung models and their geometries was made and the acquired results were used for the calculation of air distribution in the respiratory tract. The last part of the thesis deals with the calculation of particle deposition and with the analysis of the results.
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Device Proposal for Measurement and Evaluation of Environmental Thermal State
Janečka, Jan ; Němeček, Pavel (referee) ; Kratochvíl, Zdeněk (referee) ; Vdoleček, František (advisor)
The thesis deals with evaluation of the environmental thermal state in closed rooms with people inside the room. The achievement of thermal comfort is related to thermal balance of human body. People are producing heat during their work, which has to be carried away from the body to surrounding area by radiation, convection, conduction, respiration and evaporation. The intensity of heat removal is influenced by environmental parameters, especially by air temperature, mean radiant temperature, air velocity and humidity. Personal factors as energy expenditure of human body and clothing resistance are influencing the intensity of heat removal as well. People are able to influence the thermal comfort by their behaviour in given environment, appropriate clothing and regulation of basic environmental parameters. CSN EN ISO 7730 standard states that environmental parameters should be estimated or measured. The operative temperature is than evaluated from collected data. This operative temperature is defined as the temperature of black enclosed area where the human body will be by convection and radiation sharing the same amount of heat as in real inconsistent environment. Nowadays on the market there is no cheap solution for sensor which is able to evaluate the operating temperature and could be used in buildings. There are a lot of professional sensors which have very high accuracy, but are very expensive. Therefore are mainly used only for research or for single and exceptional measurement of environmental thermal state in rooms. The thesis is therefore focused on proposal of suitable (compact) operative temperature sensor assembled according to valid regulations and standards. Emphasis is placed mainly on the sensor price together with guarantee of sufficient accuracy. The proposed sensor is providing information to control system which is than able to adjust the parameters of environment using appropriate way based on relevant requirements. Here is some space for energy savings due to possible continuous measurement and evaluation of environmental thermal state in different rooms. Therefore, during continuous measurement no unnecessary rooms overheating in winter as well as unreasonable cooling in summer should occur. This research and solution is than reflected in reduction of energy consumption used for building operation and subsequently reduction of the pollutants production. This issue is being watched with increasing interest. Another advantage is that whole system is able to work autonomously without human intervention. People no longer have to continuously adjust air temperature because the control system is able to evaluate the most appropriate adjustments based on objective data obtained from the sensor. The thesis includes subsequent verification of proposed sensor as well as the definition of sensor technical parameters including analysis of measurement uncertainties.
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Coupling of the Models of Human Physiology and Thermal Comfort
Pokorný, Jan ; Masaryk, Michal (referee) ; Kratochvíl, Zdeněk (referee) ; Jícha, Miroslav (advisor)
The thesis deals with car cabin environment and thermal comfort inside. A car cabin heat load model was developed in Dymola/Modelica to investigate influence of ambient environmental parameters. The model was validated on the data set of eight test cases measured in a climatic chamber and in a real traffic. The main objective of the thesis was to develop a human thermal comfort model suitable for non-homogenous environments and for a car cabin environment especially. The Coupled model of human physiology and thermal comfort was developed in Dymola/Modelica. The model allows predicting an overall human thermal comfort from local boundary conditions representing ambient and personal factors. The model was validated by 16 test cases taken from experiments in literature. Moreover three test cases were created in Theseus-FE to consider an asymmetrical heat load from Sun rays inside a car cabin. Prediction of the Coupled model was compared with Fiala model and experimental data. The Coupled model predicted mean skin temperature for moderate activities in neutral and warm environment well. In cold environment a predicted core temperature was very affected by ambient temperature and during high activity exercises, the predicted mean skin temperature was too high.
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The Study of Biopolymers Stability Using Light Scattering Techniques
Kratochvíl, Zdeněk ; Sedláček, Petr (referee) ; Kalina, Michal (advisor)
The stability of chosen biopolymers (or simple carbohydrates and amino acids) was in-vestigated using light scattering methods. Samples were prepared by dissolving the sub-stance in deionised water or in diluted acetic acid. Firstly, the effect of increasing concen-tration on zeta potential was observed and the optimal concentration for the next measure-ments was determined. Afterwards, the stability and the molecular weight of used sub-stances were studied during long-time storage in different time intervals. It was found out that chitosan, CMC, hyaluronate and sodium alginate were subjected to degradation whereas increase of the molecular weight and the zeta potential was observed in case of BSA. In the end, the samples were exposed to several different external effects, namely the influence of different temperatures, UV radiation and increasing ionic strength. The results showed that rather higher temperature has a significant impact on biopolymers stability. However, used biopolymers were hardly affected by UV radiation except BSA whose molecular weight increased considerably. Decrease of the zeta potential absolute values and the molecular size usually occurred with increasing ionic strength. The change of molecular weight was not detected.
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Change in the Production of oversize Components of the Pump
Kratochvíl, Zdeněk ; Prokop, Jaroslav (referee) ; Kalivoda, Milan (advisor)
The thesis proposes a method for implementing structural changes on the compression flange of the main circulation pump, at the time of its overhaul during the unit outage. This structural modification consists in Annular groove of the groove to a diameter of about 850 mm. It is necessary to choose a suitably radius of maximum made possible smoothly rounded grooves without notches to reduce the stress of the concentration at the corners of the groove. Possibilities for making this adjustment are considered in this thesis and then the technology is selected with control torque calculations. The selected technology consists in the sizing of grooves with the mobile numerically controlled machining lathe EFCO TDF-2 NC, which is documented in the Annular groove of the axial grooves. In conclusion there are described other possibilities of using of this mobile machine in the primary circuit of a nuclear power plant.
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The readiness of pupils and teachers at elementary and secondary schools in an emergency planning zones during an emergency situation at a threatening company.
KRATOCHVÍL, Zdeněk
After the Velvet Revolution in 1989, the national defence education program was terminated. Since it played an important role in the education of the population it was eventually restored in 2003 at primary and secondary schools when a general education program of national defence was introduced. The extend of the education was agreed for 6 hour per year, however, it was not clear in which school subject this matter should be addressed. Since then the government succeed in issuing several conceptual guides describing the outline of the education for both pupils and teachers. The guarantor of the program became the General Directorate of Fire Rescue Service of the Czech Republic, who publishes a large number of training documents. Soon after, the issue is also dealt by the civilian sector that gradually increases numbers of manuals and textbooks focusing on the theme of population protection. Consequently in 2012, they succeed in introducing a compulsory subject called "Human Protection in Emergency Situations" at pedagogical faculties. These progressive measures target to improve a teaching methods and a general education at primary and secondary schools in the area of population preparedness to deal with an emergency situations such as floods or hazardous substances leakage from threatening factories. This work focuses on a level of preparedness of students and teachers in a primary and secondary schools, which are located in areas with a thread of leakage, conflagration or possible explosions. The first theoretical part focuses on the history of a protection of a population in the world and consequently in the Czech Republic. History significantly affects this area. Therefore a considerable portion of a theoretical part has been dedicated to it. In the next section the impact of the current legislation laws to protect the population have been analysed. This analysis focuses especially on laws which are most vital for this field. Following section points out, which governmental and non-governmental institutions have the highest responsibility for the primary and secondary education, the level of population preparedness and the knowledge in the area of the studied subject. The last part of the theoretical work analyses the environment in which the sociological research had been conducted. It contains more information about schools in which the survey had been performed by means of questionnaires. The main purpose of this chapter is to point out the characteristics of the schools. Another part analyses the territory in which the schools are located, their capacity, diversity of students, especially weather there are non-Czech speaking or handicapped pupils, or within which time zone the schools are. All schools also support various extracurricular activities, and the thematic group activities. Based on my practical experience from the lectures I pre-set the level of the students and teachers? preparedness in case of extraordinary events within threatening company is low or almost unsatisfactory. Consequently, the respondents undertook 10 test questions. In the practical part of this work, the questionnaire survey was assessed both by means of statistical methods and a thorough analysis of the individual questions answered. To simplify the evaluation, statistical methods were used by means of negating hypotheses of the proposition. In other words, the level of the preparedness will be satisfactory. Subsequent evaluation of the sociological research revealed that the level is satisfactory at all schools. In general, both students and teachers achieved overall pleasing results. The results of the survey will be provided to the Fire Rescue Service of the Pardubice Region to utilize them to streamline all the activities related to the education of students of the surveyed schools.
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Cultural shock: Russian in the Czech Republic
Půža, Daniel ; Kovář, František (advisor) ; Kratochvíl, Zdeněk (referee)
The diploma paper: Cross-cultural shock: Russian in the Czech Republic picks up again on the bachelor paper. In the theory part I focused on the intercultural management, cultural dimension, analysis of the economical, diplomatic and political relationship between czech and russian nations. The last one is the cultural shock as a big problem these days. In the practical part I analysed cultural shock of the russian students studing at the University of Economics, Prague.
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