National Repository of Grey Literature 35 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
High Voltage Pulse Generator and Control Unit
Gruber, Jan ; Janovec, Jiří ; Šonský, Jiří ; Němec, Tomáš
The report contains description of Pulsed Power Source Unit (PPSU) and Spark Control Unit (SPCU), which are utilized in combination with Spark Discharge Chamber and pair of electrodes for aerosol synthesis of nanomaterials. The report includes electronic schematics, list of components, description of connectors and way to chain-link and operate more sets of units. The report also includes information about discharge reference parameters and description of communication protocol and its variables.
Thermodynamic modelling of hydrogen fuel cells
Nováček, Marek ; Pavelka, Michal (advisor) ; Němec, Tomáš (referee)
In this thesis, proton exchange membrane fuel cells are studied. At the beginning, the ideas underlying their function are exposed and some possibilities of usage are pre- sented. Thereafter, we aim to describe the processes inside the fuel cells with the aid of thermodynamics and in agreement with constitutive relations that have been obtained experimentally. Namely, we are interested in the fluxes of water and protons inside the membrane, where they are acted upon by thermodynamic forces, and the electrochemical reactions at the electrodes, which can be described by the Butler-Volmer equations. Also do we study the efficiency of the fuel cell by evaluating the production of entropy due to the diverse processes that take place in the fuel cell. It is the goal of the computational part of this thesis to propose a zero-dimensional model and compare it with the results provided in the supervisor's doctoral thesis. 1
Thermodynamic modelling of hydrogen fuel cells
Nováček, Marek ; Pavelka, Michal (advisor) ; Němec, Tomáš (referee)
In this thesis, proton exchange membrane fuel cells are studied. At the beginning, the ideas underlying their function are exposed and some possibilities of usage are pre- sented. Thereafter, we aim to describe the processes inside the fuel cells with the aid of thermodynamics and in agreement with constitutive relations that have been obtained experimentally. Namely, we are interested in the fluxes of water and protons inside the membrane, where they are acted upon by thermodynamic forces, and the electrochemical reactions at the electrodes, which can be described by the Butler-Volmer equations. Also do we study the efficiency of the fuel cell by evaluating the production of entropy due to the diverse processes that take place in the fuel cell. It is the goal of the computational part of this thesis to propose a zero-dimensional model and compare it with the results provided in the supervisor's doctoral thesis. 1
Avifauna zemědělské krajiny v okolí města Náměšť nad Oslavou
Němec, Tomáš
This bachelor´s thesis concentrates of frequency of bird species, which were folowed on specific localition in surrouding of town Náměšť nad Oslavou in time period of 2018. In selected localitions there were observed number of occurred sort of birds and species representation with ornitologistic methods and there was followed their number depending on antropogen activity in countryside. With periodically visits after seleced localitions there were watched birds and their nestings. During regular time intervals I visited these localitions and there were collected dates for my work. My results show that various kinds of birds are provably depending on various biotops in which they are living and reproductiving and the whole negative touches into countryside lead to number lowering of bird population.
The Effect of Nanofibres Dispergation on the Properties of Sintered Ceramic Body
Němec, Tomáš ; Keršner, Štěpán (referee) ; Sokolář, Radomír (advisor)
The main goal of this diploma´s thesis is to review final qualities of traditional porcelain body with using nanofibers. The theoretical part of the thesis summarizes the current knowledge of the research on ceramic composite with using nanofibers. The vast majority of these researches is engaged by reinforcing technical ceramics, on the other hand area of traditional porcelain is still unexplored area. Besides that there are shown technological ways of the production and dispersion of the most important types of nanofibers. In the practical part of this thesis is experimentaly defined the most effecient way of homogenization procedure and the most effecient dose of nanofibers for pure kaolin body. In conclusion are compared the resulting properties of traditional porcelain body with using Al2O3 and SiO2 nanofibers.
Evaluation of the safety of the transport of dangerous goods by road
NĚMEC, Tomáš
The theoretical part approaches the topics connected with the transport of dangerous goods and associated topics, for example, from the development of legislation relating to the transport of dangerous goods from the time of the Austrian empire and the First Czechoslovak Republic through the current legislation, e. g. domestic and international validity, and also an important document - the agreement of the ADR, on which the legal rules are based. The next part of the thesis is concerns hazardous substances, including the description of their classification and identification. The following section, which deals with the characteristics of the transport of dangerous goods, including training of persons carrying dangerous goods, the obligations of the participants with transportation from the point of view of safety. An important part of the transport of dangerous goods is also documentation. The three basic documents are: transport document, safety data sheet and the written instructions for the driver. The theoretical part of the thesis deals with the following: the requirements regarding the properties on gear road vehicles that transport dangerous goods; the activities of the occupants of the vehicle, if an accident occurs or the emergency situation and the related release of hazardous substances; traffic restrictions, such as restrictions on the transit of vehicles carrying dangerous goods in road tunnels. Conclusion of the theoretical part deals with the principles of the behavior of the population in case of accidents with leakage of hazardous substances and related improvised protection of individuals. These principles build on the models of situations with leaks of hazardous substances that are listed as part of the results. The aim of this thesis is to determine compliance with the legislation on the transport of dangerous goods by road. For setting the goals there are two research questions, namely: How much are traffic regulations being broken? Which regulation of the transport of dangerous goods by road is being broken most often? To determine the answers to the research questions we chose a survey using the questionnaire survey focused predominantly on the driver transporting dangerous goods by road. In the thesis, respectively, the research included a total of 100 valid questionnaires. In the questionnaire survey all of the respondents were randomly chosen, however, some of them refused to answer some questions. The survey revealed that infringement in the field of transport occurs in a fairly small range. The selected eighteen provisions in the legislation, which were violated in varying degrees, were most often replied by the drivers that they never met with the violation of the regulation (together marked 825 times, expressed in % 45,83 % of the total), exceptionally (together marked 782 times, expressed in % 43,44 % of the total), regularly (together indicated by 181 times, expressed in % 10,06 % of the total) or always (together identified 12 times, expressed in percent of the 0.67% of the total). The questionnaire survey also revealed that violations of regulation of the smoking ban is most often. Out of 100 respondents, 30 answered that they met with a violation of this regulation regularly (26) or always (4). Among the other most frequently infringed legal regulations in the field of transport include the rules in securing the cargo to the loading area, where 19 respondents out of 100 answered that they met with a violation of this regulation regularly or always. The rules concerning the manipulation with dangerous goods during the course of loading and unloading, it was noted that 19 of the respondents met with a violation of this regulation regularly (17) or always (2). There are also the results of modeling accidents in the program of the Terrorist Expert TerEx.
Analysis of the Financing of Professional Social Centers in the South Moravian Region
Němec, Tomáš ; Lattenbergová, Miroslava (referee) ; Kopřiva, Jan (advisor)
The thesis reviews present financing of professional social centres in South Moravian region with regard to the law no. 108/2006 Sb. It evaluates the possibilities of EU, ministerial and public financing of the organizations providing services specified by the communal plan of South Moravian region. Proposals for efficient supervision of such organizations are put forward, with emphasis on the importance of the provided services as well as their quality.
Audio signal processing in FPGA circuit
Němec, Tomáš ; Bohrn, Marek (referee) ; Fujcik, Lukáš (advisor)
The main goal of this thesis is design of simple digital audio synthesizer. The synthesis of piano tones are descrribed. Final part is devoted to the basic principle of sound sample processing.
Violence and aggression in healthcare professionals with a focus on workplace of acute psychiatric care
Němec, Tomáš ; Jirkovský, Daniel (advisor) ; Haluzíková, Jana (referee)
The aim of the bachelor thesis was to provide basic information on aggressiveness at selected workplaces of Bohnice Psychiatric Hospital. In the framework of this work, a questionnaire was submitted to 194 respondents performing general nurses or health care professions, acute care departments and subsequent psychiatric, anti-toxic and gerontopsychiatric care. The investigation took place during December 2016 and January 2017. The main results showed that respondents from PN Bohnice encounter high frequencies with aggressive patients, i.e. daily or weekly in 60% of cases. Most respondents (92%) encountered verbal and physical aggression. The most common kind of physical aggression is the destruction of property (52%), the assault of a health care professional (40%) and self-harm (39%). The most common type of aggressor is male (50%) and female (44%), less frequent visits and the patient's family (3%). For men, physical aggression is higher than for women by more than 13%. According to medical professionals, the most common cause of aggression is the disease (67%), fear and anxiety (32%), and the third is environment (27%). Physicians deal with conflicting situations most often by appointment (97%), and secondly in cooperation with other health workers, i.e. they call service (55%) or doctor (44%)....
Consistency of empirical corrections of the classical nucleation theory for nucleation in steam with nucleation experiments and molecular simulations
Hrubý, Jan ; Duška, Michal ; Němec, Tomáš ; Kolovratník, M.
We compare experimental nucleation rates for water vapour in various carrier gases, nucleation rates deduced from empirical adjustments of the classical nucleation theory (CNT) earlier developed to reproduce pressure and optical data for condensing steam flows in converging-diverging nozzles and turbine stages, and ucleation rates obtained from molecular simulations. Results of original molecular dynamic simulations for TIP4P/2005 force field in the NVE conditions are provided. New experimental nucleation rate data sets are generated based on empirical CNT corrections by Valha and Nedbal (1980) and by Petr and Kolovratník (2011). Correction of the CNT for non-isothermal nucleation conditions is applied to experimental, simulated and the derived experimental data. The derived experimental\nnucleation rate data follow a similar temperature trend as the nucleation rate data for water vapour in carrier gases at lower temperatures. The ratio of observed nucleation rates to CNT predictions decreases more steeply with temperature than the empirical correction by Wölk et al. (2002). Ratios of nucleation rates computed from molecular simulations to CNT predictions do not show a significant temperature trend.

National Repository of Grey Literature : 35 records found   1 - 10nextend  jump to record:
See also: similar author names
26 Nemec, Tomáš
26 NĚMEC, Tomáš
1 Němec, T.
1 Němec, Tadeáš
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