|
| |
|
|
Czech Consonants and Their Realization by Vietnamese Speakers
Čepelíková, Monika ; Machač, Pavel (advisor) ; Štěpánová, Veronika (referee)
Present diploma thesis deals with perceptively noticeable deviations in realization of consonants in Czech of Vietnamese native speakers. The aim of the thesis is identification, characterization, categorization and quantification of the deviations from common Czech pronunciation according to specific ways of realization. In the theoretical part the consonant systems of both the languages and their syllabic structures are compared contrastively. The following chapter is dedicated to a short analysis of the pronunciation exercises and their didactic contribution in the most frequently used textbooks of Czech as a foreign language. Moreover, a textbook designated for Vietnamese speakers and an English textbook were analyzed for a better comparison. The research itself is based on an analysis of 16 records of Vietnamese native speakers by a method of careful listening in Praat program. The results have shown that the most frequent deviations in the speech of Vietnamese speakers were caused by interference from their mother tongue, especially because of the different consonant systems of Czech and Vietnamese and their different phonotactic rules. Keywords: Czech as a foreign language, Vietnamese, pronunciation, consonants, phonetics, didactics
|
|
|
Duration of syllabic liquids in Czech
Vernerová, Tereza ; Machač, Pavel (referee) ; Palková, Zdena (advisor)
This thesis brings basic data on duration of syllabic liquids r and l in Czech. The experiment measured the duration of syllabic and non-syllabic liquid consonants occuring in 3 stress group positions and short vowels in 2 positions; the sounds were isolated from utterances of 6 native speakers of Czech. Apart from this, the experiment also measured the syllabic liquids length on the basis of complementary utterances of 5 radio speakers. The total amount of the measured sounds was 852.
|
|
|
Passivation of Aluminum and Aluminum Alloys in passivation baths without Cr6+ Compounds
Macháč, Pavel ; Tulka,, Jaromír (referee) ; Molliková, Eva (advisor)
This diploma thesis deals with evaluation of efficiency of protection conversion coatings created by passivation metals and alloys in passivation baths without chromium compounds. The theoretical part is initially concerned with question of electrochemical corrosion of metals, consequently there are mentioned different methods of corrosion protection. The main section of theoretical part of this thesis deals with chromate conversion coatings, description of their protective efficiency (including their unique self-healing effect) and then with account of new chromate-free conversion coatings occurring as chromate alternatives, whose usage is constrained because of their content of hexavalent chromium, which is highly toxic, oxidizing and also carcinogenic and thereby very dangerous for human body and the environment. Experimental part of this thesis is concerned with evaluation of efficiency of particular conversion coating which is quite commonly use in some applications as chromate alternative. It is chromate-free conversion coating which is created by passivation of metals or alloys in passivation bath Pragokor BP, which contains zirconium fluorocomplexes and is without any chromium or other toxic or ecologically unhealthy compounds. The influence of sealing of the coating in preparation Pragokor Seal Al and also other surface treatments such as application of conservation wax WAXENG or cold application of zinc coating were tested too. Efficiency of mentioned surface treatments was then evaluated on aluminum and steel by laboratory accelerated and atmospheric corrosion testing.
|
|
|
Thermodynamics of Solutions
Macháč, Pavel ; Münsterová, Eva (referee) ; Molliková, Eva (advisor)
This bachelor thesis deals with principles of thermodynamics of solutions. The theoretical part is initially concerned with question of solutions generally, such as for example the issue of classification of solutions, expression of solutions composition and a range of mutual solubility. The pivotal part of this document deals with solid solutions, mainly from the thermodynamic point of view. Specifically the issue of thermodynamic activity of components in these solutions is highlighted. There is a detailed description of the ways of determination of the thermodynamic activity, both experimentally and through the use of calculation. Finally there are described the possibilities of the use of the thermodynamic activity, such as for example using it to calculate the other thermodynamic quantities. The practical part of this thesis includes calculation of the thermodynamic activity of components of alloy Bi-Mg at assigned temperature, the partial molar dissolving free enthalpy of components in solution and the calculation of total dissolving free enthalpy of the solution.
|
guest ::
RSS feed.