|
| |
|
|
Possibilities of the description of stress-strain curves for computational simulations
Košťál, Josef ; Halabuk, Dávid (referee) ; Šebek, František (advisor)
Tato bakalářská práce se zabývala problematikou určování křivky zpevnění (taktéž „flow curve“) z experimentálně změřených výstupů tahové zkoušky a regresí této zjištěné křivky nelineárními vztahy. Byl prezentován teoretický základ zkoušky tahem a jejího výstupu a také byly popsány rozdíly mezi smluvním a skutečným napětím a přetvořením. Dále byla zmíněna analytická korekční metoda (Mirone-La Rosa) pro odhadnutí trendu křivky zpevnění. Tato metoda využívá standardních výstupů tahové zkoušky. Dále byly vypsány elasto-plastické po částech spojité materiálové modely, a navíc byly vybrány a detailněji rozebrány 4 nelineární vztahy pro popis křivky – Hollomon, Ludwik, Swift a Voce. Následně byla použita metoda konečných prvků pro určení a zkalibrování křivky zpevnění oceli 18CrNiMo7-6, změřené tahovou zkouškou. Pouze standardní výstup tahové zkoušky byl potřeba pro kalibraci. Křivka zpevnění byla zkalibrována iterační výpočtovou metodou na základě srovnání reakční síly ze simulace se silou z experimentu. Nakonec bylo vytvořeno uživatelské prostředí pro nalezení nejlepší regrese ze čtyř vybraných nelineárních vztahů.
|
|
|
Vzdělávání dospělých v podmínkách dřevozpracujících oborů středních odborných škol
Košťál, Jiří
This work is focused on the identification and description of trends in the woodworking fields in combined or distance form of the further education. The theoretical part is devoted to trends in professional education in the field of woodworking and it deals with professional qualifications as an instrument of the active employment policy. The introduction of the practical part introduces the educational institution where these trends in education are applied and where the data collection for questionnaires was conducted. The main part of the practical part is devoted to the questionnaire surveys. It includes the input questionnaire of statically selected group of candidates, the questionnaire survey among students, the evaluative questionnaire survey of graduates and the questionnaire survey of employers of graduates and how they see further employment of retraining participants in the labour market. The aim of this work is to identify the trends and define the methodology for solving trends in the professional growth of adult education in the field of woodworking.
|
|
|
Effect of operating parameters of the boiler on presence of fine particles in flue gas
Košťál, Jan ; Poláčik, Ján (referee) ; Pospíšil, Jiří (advisor)
This diploma thesis is devoted to the issues of the formation of fine particles in dependents on the combustion parameters. The first part of thesis is review, which summarized the information about combustion process and about formation of the gaseous products and fine particles inside them which created during combustion process. The main content of thesis is realization of measurements of fine particles from combustion, in several types of the tested combustion devices. Next part is a description of used measurement devices, which used for measurement. Last chapters are focused on evaluation of results from the measurements, comparison of the measurements between themselves and the finding the existence of the dependence of the formation of fine particles on operational parameters of boiler. And all results are evaluated in the conclusion.
|
|
| |
|
|
Unconsciousness of unknown etiology in first contact
KOŠŤÁL, Jan
This Bachelor Thesis deals with the topic: "Unconsciousness of unclear etiology upon the first contact of the emergency services with a "patient". The causes of unconsciousness are generally very diverse, which means that the exact cause can remain unclear during the first contact and during the phase of pre-hospital emergency treatment.Duringthelaterphaseof hospital care,more time and more sophisticated ways of examination are available to clarify the exact cause of unconsciousness. In the theoretical part of this Thesis, was a summarize the basic knowledge on consciousness and on the causes of impaired consciousness or unconsciousness. Next is a describe the diagnostics of unconsciousness during the pre-hospital medical care and present the practical procedures that need to be followed by paramedics taking care for unconscious patient. The most often causes of unconsciousness are: hypoglycemia, intoxications, craniocerebral injuries, hypoxia linked to cardiopulmonar resuscitation, bleeding to brain and brain stroke. From the point of view of the paramedic, the most important is to make early distinction between the states linked to intoxication or metabolic disorders and the states linked to intracranial injuries, bleeding and stroke. While the former states require immediate intervention by paramedic, the later states require neurosurgical intervention in the hospital. In the experimental part of this Thesis, was mapped the practical knowledge of paramedics on pre-hospital medical care for for unconscious patient. The mapping was conduct using the technique of standardized semi-structured dialogues with 14 respondents paramedics selected from all seven regional stations of the Emergency services of the South bohemian district, Czech Republic. The respondents differed in age, duration of their professional career, and level of education. All respondents answered 16 questions. All their answers are presented in the Thesis in the full form as well as processed in the Table form. In investigation proved practical difficulties with the diagnostics of unconscious patients. The results indicate that more attention should be paid by paramedics to obtaining full and correct anamnesis plus general examination of the patient. Based on early diagnosis, paramedics can decide on therapeutical procedures and on directing the patient to relevant hospital. In case of patient with secured life-functions, it is recommended to direct the patient to specialized healthcare facility, which shortens the interval between injury and targeted treatment. Results also point toward the general need that paramedics should undergo regular training in new methods and trends in paramedical care. Using of new methods of capnometry is one case where more widespread usage in paramedical practice could bring significantly better results.
|
|
|
Position Improvement Using Differential GPS
Košťál, Jaroslav ; Hrubý, Martin (referee) ; Novotný, Tomáš (advisor)
The bachelor thesis describes techniques of precision of a position using a differential GPS. The theoretical part provides with basic terminology on classical and differential GPS and with a blueprint for implementation of the differential GPS. The aim of the practical part is the implementation of the blueprint per se using two suitable GPS modules with data processing on the station in real time and creation of a graphical interface. The final determining of the position should be more accurate than one using a classical GPS.
|
|
|
Applications of titanium alloys
Košťál, Jan ; Kaštyl, Jaroslav (referee) ; Němec, Karel (advisor)
This bachelor thesis will deal with titanium and titanium alloys, their properties and appropriate application in mechanical engineering and other branches. The first part is devoted to the pure titanium, describes technology of production, there are also briefly mentioned physical, chemical and mechanical properties, and according to them the position of titanium among other elements. The main part is focused on the different types of titanium alloys, their properties, production and processing. The conclusion is devoted to the use of pure titanium and its alloys in different industries.
|
|
|
Knihovna pro práci se soubory formátu Office Open XML
Košťál, Jaroslav
The thesis deals with a library for working with Office Open XML Files -- spreadsheet files --, with its analysis, suggested layout, and implementation. It includes a specification of a standard spreadsheet file and of ways of creating such files. Based on studied theory, a layout is suggested for a library for reading and recording data, and for implementation of such a library in the C# language, which offers interface suitable for working with this type of documents.
|
|
|
Safety assessment of Temelin NPP
KOŠŤÁL, Jaroslav
History of peaceful use of nuclear energy, despite of all necessary emphasis on operation safety, is accompanied by a series of accidents, some of which left indelible trace in minds of wide public and so led to changes in the comprehension of nuclear safety and in the access to its preservation. Because the consequences of possible nuclear power plant accident have always serious social impacts, it is most desirable to define all possibly risks, to quantify probability of their formation and in this way to gain the possibility to prevent them effectively and efficiently. This work is dedicated to approve or to disapprove that the KARS method is practically applicable for evaluation of nuclear power station operation safety. The work objective is to evaluate events and risks associated with the operation of a particular nuclear facility by the KARS method and critically evaluate obtained results and the used method as such. The work is divided into theoretical and practical part. Theoretical part includes basic information necessary for correct understanding of the chosen data processing procedure and subsequent interpretation of the gained results. A brief overview of basic concepts relating to the nuclear safety, the safety culture and the emergency preparedness, including their definitions is given in this section of the work. For the evaluation of obtained results it is useful to make familiar with basic concepts of the NPP safety evaluation, PSA and the stress tests. Obviously, it is necessary to describe the KARS method and to define the concept of quality of human performance with regard to the obtained results. The risk analysis by the KARS method was carried out in the four consecutive steps: 1. Data collection for the risk analysis. 2. Data processing by the use of the KARS method. 3. Interpretation of the obtained results. 4. Comparison of the obtained results with the available data. The particular risks for the construction of the risk correlation table were based on the analysis of activities of individual members of the emergency and technical support center on the basis of managing documentation for each function. In the emergency instructions these risks are either named or the action to manage them are determined. Subsequently these risks are further more specify according to the operational documentation used for solving abnormal and emergency conditions or solving of severe accidents. Determination of the risk correlation seems to be subjective and requires a considerable degree of professional insight into the analyzed issues. The risk analysis was processed according to the procedure that was laid down by Ing. Stefan Pacinda, Ph.D. Each risk taken into consideration in this analysis is briefly described within the interpretation of obtained results. The coefficients of activity with the biggest value were found for these risks: human error, earthquake, plane crash, terrorist threat, errors in operating and managing documentation and fire. The coefficients of passivity with the biggest value were found for these risks: human failure, serious damage to health, ecological disaster, components malfunctions, radiation accident, nuclear material integrity damage and control system malfunctions. Comparison of the risks that were postulated in the stress tests and the risks that were considered in this analysis indicate that the ETE NPP emergency response was prepared to be able to cope these risks. Results of this analysis showed that the essential element for the safe operation of nuclear power plants is qualified, well selected and systematically trained staff. In light of the experience acquired during elaboration of this work I have concluded that the KARS method can be used for nuclear safety evaluation only in a limited way.
|
guest ::
RSS feed.