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Heat exchanger design for waste air heat recovery
Valentová, Helena ; Toman, Filip (referee) ; Baláš, Marek (advisor)
The master’s thesis deals with heat recovery from waste air in a multifunctional hall. The thesis contains a theoretical part that shows required parameters of an indoor environment, a composition of an air handling unit and a description of its individual parts suitable for this purpose. Subsequently a design calculation of a rotary heat exchanger and a plate heat exchanger is made. The calculation contains geometry, heat transfer and pressure drop. Then the heat exchangers are compared and a more suitable option for this application is chosen. Further the thesis includes drawing documentation of both types of heat exchangers.
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CO2 Sources and Emission Trading System
Valentová, Helena ; Sitek, Tomáš (referee) ; Elbl, Patrik (advisor)
This thesis deals with issues of carbon dioxide emissions, its sources and legislation related to emission trading. The first part of the thesis provides basic information about carbon dioxide and its production. The second part summarizes sectors that emit the most carbon dioxide. The last part describes the international legislation related to emission allowances and carbon trading.
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Heat exchanger design for waste air heat recovery
Valentová, Helena ; Toman, Filip (referee) ; Baláš, Marek (advisor)
The master’s thesis deals with heat recovery from waste air in a multifunctional hall. The thesis contains a theoretical part that shows required parameters of an indoor environment, a composition of an air handling unit and a description of its individual parts suitable for this purpose. Subsequently a design calculation of a rotary heat exchanger and a plate heat exchanger is made. The calculation contains geometry, heat transfer and pressure drop. Then the heat exchangers are compared and a more suitable option for this application is chosen. Further the thesis includes drawing documentation of both types of heat exchangers.
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Polar liquid crystals: structures, phase transitions and properties
Podoliak, Natalia ; Novotná, Vladimíra (advisor) ; Perkowski, Pawel (referee) ; Valentová, Helena (referee)
In the thesis the structure-property relations of newly synthesised liquid crystalline compounds have been investigated with respect to the length of the non-chiral chain, number of lactate units or the lateral substitutions in the molecular core. Such promising for applications phenomena as orthoconic properties and de Vries behaviour have been found and studied for certain compounds. Besides, the antiferroelectric, TGB, hexatic phases have been observed for some compounds of the studied series. Such unique phenomenon as re-entrancy has been observed for a few compounds of the series under investigation and binary mixtures of one compound with neighbouring homologues have been prepared and studied.
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Mechanical Properties of Hydrogels - Comparison between DMA and AFM Measurements of Elastic Modulus
Hofrichterová, Tereza ; Valentová, Helena (advisor) ; Shukurov, Andrey (referee)
Polymer hydrogels consist of polymer network that is able to absorb large amount of water. They have plenty of real-life applications - for example in medicine and diagnostics. The aim of this thesis is to study elastic modulus of several hydrogel samples by two different methods - dynamical mechanical analysis (DMA) and atomic force microscopy (AFM). Dynamical mechanical analysis represents a traditional method, which is expected to supply very reliable data. On the other hand - there has not been done much research in the field of studying mechanical properties with atomic force microscopy yet. This thesis should result into comparison of these two methods and describing effects that influence the measurement.
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CO2 Sources and Emission Trading System
Valentová, Helena ; Sitek, Tomáš (referee) ; Elbl, Patrik (advisor)
This thesis deals with issues of carbon dioxide emissions, its sources and legislation related to emission trading. The first part of the thesis provides basic information about carbon dioxide and its production. The second part summarizes sectors that emit the most carbon dioxide. The last part describes the international legislation related to emission allowances and carbon trading.
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Mechanical Properties of Hydrogels - Comparison between DMA and AFM Measurements of Elastic Modulus
Hofrichterová, Tereza ; Valentová, Helena (advisor) ; Shukurov, Andrey (referee)
Polymer hydrogels consist of polymer network that is able to absorb large amount of water. They have plenty of real-life applications - for example in medicine and diagnostics. The aim of this thesis is to study elastic modulus of several hydrogel samples by two different methods - dynamical mechanical analysis (DMA) and atomic force microscopy (AFM). Dynamical mechanical analysis represents a traditional method, which is expected to supply very reliable data. On the other hand - there has not been done much research in the field of studying mechanical properties with atomic force microscopy yet. This thesis should result into comparison of these two methods and describing effects that influence the measurement.
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Polar liquid crystals: structures, phase transitions and properties
Podoliak, Natalia ; Novotná, Vladimíra (advisor) ; Perkowski, Pawel (referee) ; Valentová, Helena (referee)
In the thesis the structure-property relations of newly synthesised liquid crystalline compounds have been investigated with respect to the length of the non-chiral chain, number of lactate units or the lateral substitutions in the molecular core. Such promising for applications phenomena as orthoconic properties and de Vries behaviour have been found and studied for certain compounds. Besides, the antiferroelectric, TGB, hexatic phases have been observed for some compounds of the studied series. Such unique phenomenon as re-entrancy has been observed for a few compounds of the series under investigation and binary mixtures of one compound with neighbouring homologues have been prepared and studied.
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Role of social worker at basic school
Valentová, Helena ; Matoušek, Oldřich (advisor) ; Malotová, Martina (referee)
Abtract Title: The role of social worker at an elementary school Name of student: Bc.Helena Valentova Department of study: Social Policy and Social Work Thesis supervisor: Doc. PhDr. Oldřich Matoušek, CSc. Opponent work: Martin Malotová The thesis is focused on the role of social worker at an elementary school. It is a comprehensive characterization of the profession including history, descriptions school of social work in several national systems of education (for example USA, England, Finland, etc.), analysis of target groups and content of school social work, which is supplemented by examples from practice. The empirical part of the work aims to determine whether the elementary schools in Praque are interested in introduction of position of school social worker and reasons of introduction. Other aims are to map the situation in solving educational problems at Prague's elementary schools, the views of the respondents to content of the activity school social worker and his authorization and also to map out how many of Prague's elementary schools have already established. The respondents were directors of the elementary schools, educational consultants and experts in prevention. Questionnaire was selected as a method of data collection because of extensive number of respondents was selected questionnaire....
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