National Repository of Grey Literature 43 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Design and implementation of a workplace for temperature rise testing
Bartek, Zbyněk ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This master thesis deals with design and implementation of a workplace for temperature rising measurement in electrical devices. The thesis deals with contact and non-contact temperature measurement, with the current equipment of the laboratory of switching devices used to measure temperature rising, and also deals with normative requirements for temperature rising tests for specific electrical devices and their systems. The next part of the thesis lists requirements for workplace design and subsequently describes the workplace design with 3D models of individual parts. The practical part describes the implementation of the workplace, then the test measurements with the current equipment of the laboratory of switching devices and with the newly created workplace for temperature rising measurement. The end of the work deals with the evaluation of the new workplace and the possibilities of further improvement of the workplace.
Technologies of the electrical apparatuses protyping
Svoboda, Filip ; Kloc, Petr (referee) ; Šimek, David (advisor)
The work focuses on the production of prototypes of electrical devices. The theoretical part contains a structured overview of the historical development of prototype production technologies and description of individual prototyping technologies. The main part of the work is the design of a prototype extinguishing chamber, printing of the chamber and verification of the ability to extinguish the electric arc.
Design of a 25 kV traction disconnector
Buchta, Martin ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This diploma thesis deals with the design of a traction disconnector for 25 kV AC and a rated current of 800 A. The result should be a competitive disconnector that is capable of potential applications on domestic railways and should have parameters that other local manufacturers do not currently offer. This is, for example, electrical strength or the size of the rated current, which is an economic option for most railway lines in the Czech Republic. According to the proposed drawing documentation, the disconnector was assembled and then the selected disconnector parameters were tested. For example, electrical strength tests, short-circuit tests, constant current tests, etc. were performed. The calculated and measured values were compared together. The designed disconnector was financially and technically evaluated on the basis of test results and the construction itself. Finally, some appropriate adjustments were proposed.
Different approaches to the social contract theory in Law and Politics.
Šimek, David ; Havel, Tomáš (advisor) ; Ondřejková, Jana (referee)
Different approaches to the social contract theory in law and politics Abstract This thesis aims to analyze individual concepts of social contract theory in works of various contractalist authors throughout history, including the 20th century. Using the method of analysis and especially diachronic comparison it tries to refute the belief that the social contract theory is only a phenomenon of the Enlightenment period of the 17th and 18th centuries, and presents the main, but also lesser known, contractalist ideas from both ancient and recent history. The thesis is, besides the introduction and conclusion, divided into five chapters and eight subchapters, some of which are also further subdivided. It follows a similar structure troughout its length, with the exception of the first (which aims to generalize the concept of social contract theory) and the fourth chapter. The second chapter is a chronologically arranged historical overview, which begins with the authors of ancient philosophy and through the Middle Ages then culminates in the early Renaissance. This is a chapter dealing with the genesis of contractualism, especially its origins in individualism, voluntarism or naturalism, as well as the concept of individual free will and the medieval phenomenon of the struggle between faith and reason, the...
Protection of business competion - agreements interfering with competition
Šimek, David ; Horáček, Vít (advisor) ; Horáček, Tomáš (referee)
The purpose of my thesis is to analyse two issues arising out of the European and Czech competition law provisions prohibiting agreements which restrict competition. First, I shall examine the issue of distinction between prohibited agreements and allowed unilateral conduct. Furthermore, I shall explore the definition of the concerted practice as interpreted by the Court of Justice of the European Union and Czech administrative courts focusing again on the distinction between such practice and unilateral conduct. Second, I shall elaborate on the structure of Article 101 TFEU. As a consequence of the "more economic approach" taken by the Commission and the repeal of the individual exemption system under Article 101(3) TFEU, the distinction between the concept of object offences and the concept of effect offences is slowly disappearing while having detrimental implications for legal certainty. Moreover, the conceptual distinction between considerations of ancillary restraints under Article 101(1) TFEU and consideration of pro-competitive and anti-competitive effects under Article 101(3) TFEU is slowly disappearing as well. The economics take their role in the assessment, and that is also the reason why I chose this topic because I am interested in the overlap between law and economics. My thesis is...
Investigation on the Interaction between Construction Materials and Switching Arc in Low Voltage Switching Devices
Šimek, David ; Slavíček, Pavel (referee) ; Mindl,, Pavel (referee) ; Kloc, Petr (advisor)
The doctoral thesis is focused on the interaction of construction materials and the switching arc in low voltage switchgear. An issue of selected low-voltage electrical devices, electric arc in electrical devices, and its diagnostics using optical emission spectroscopy and high-speed video are discussed at the theoretical level. The main part of the work is an experimental examination of samples of selected high-performance industrial plastics. A series of tests of resistance to an electric arc were performed on these plastics. The electrical parameters of the switching process, the weight losses of the material of the quenching chambers when applying various power parameters were evaluated from the experiments. The empirical equations were determined for the calculation of the loss of individual materials in a specific configuration. Furthermore, the influence of the used material on the behavior of the electric arc in the extinguishing chamber made of these plastics was investigated. A high-speed video was recorded, the time evolution of the pressure inside the chamber, the electrical parameters of the arc, and the time-resolved evolution of the radiation spectra were measured using atomic emission spectroscopy in these measurements. The relative composition of the plasma was identified from the radiation spectra, and the time evolution of the relative contamination of the discharge area by the main contact material and the selected vapors of the used plastics was created. The last important parameter of the electric arc is its temperature, which was also calculated from the radiation spectra. A comparison of individual plastics and their applicability for applications in contact with electric arc was performed based on the obtained data.
Campaign of the Czechoslovak National Socialist Party in the 1946 Elections
Šimek, David ; Shavit, Anna (advisor) ; Konrádová, Marcela (referee)
The bachelor thesis aims to present the campaign of the Czechoslovak National Socialist Party (CNSP) in the 1946 Elections, to which it also provides relevant theoretical and historical context. The post-war period in Czechoslovakia (1945-1948) is most often examined from the point of view of the Czechoslovak Communist Party and its gradual takeover of power in the state, culminating in February 1948. Other political parties of this period thus often find themselves overshadowed, despite their important role in the afterwar renewal of political and social life. This work therefore hopes to enrich the discourse with the CNSP perspective. The first part deals with theoretical background of political communication (examining the term propaganda) and with development of party organization and election campaigning. Emphasis is placed on concepts that approach the issues from a wider historical perspective, thus allowing an analysis of models and patterns of political practice which are in today's world mostly obsolete. The second part describes the political and social context of the 1946 Elections. The third part is dedicated to the Czechoslovak National Socialist Party, its origins, history and leading candidates in the 1946 elections. Subsequently, the main aspects of the party's election campaign...
Temporal Development Of Relative Ablation Of Plastics In Miniature Circuit Breaker During Switching Process
Simek, David
The paper is focused on an ablation of plastic materials in contact with an electric arc inside the electrical apparatus during the switching process. It is possible to obtain temporal development using method based on optical emission spectroscopy. The emission spectra were taken during the switching process. The hydrogen alpha spectral line of Balmer series was used as an indicator for evaluating of plastics ablation. Complications connected with the measurements are discussed. The main part of the paper deals with a temporal development of relative concentration of a hydrogen in plasma inside the miniature circuit breaker. Atomic spectral lines database of National Institute of Standards and Technology was used as a spectral data source for evaluation.
DC arc extinguishing in low voltage switching devices for critical currents
Fencl, Martin ; Šimek, David (referee) ; Píška, Jakub (advisor)
This bachelor’s thesis deals with DC arc extinguishing for critical currents. The first, theoretical part describes and defines an arc, a DC arc and methods of its extinguishing. The second, theoretical part concerns spectral analysis – specifically, the emission method. Methods of research of extinguishing critical currents are also presented. The practical part consists of two measurements. The first measurement consists of spectrum measuring in time, in conjunction with voltage and current measurements. In the second measurement, the goal was to measure the dependence of arc burning time on voltage and current. The thesis concludes with summary of the results of each individual measurement and their presentation in the wider context.
Design of MV contactor for railway application
Pala, Lukáš ; Šimek, David (referee) ; Valenta, Jiří (advisor)
In the introduction a traction circuit is analyzed with different types of electric devices. The thesis describes power railway electric circuits, their loads and types of used contactors. Railway standards chapter summarizes requirements of standards for railway contactors. Follows literature focusing on power current switching and power switching devices design. Based on previous, a design procedure is developed for railway MV contactor in accordance with end-user and standards requirements. Thesis closes with pre-designing a railway contactor by calculating electrodynamic forces, heatflow and mechanical components.

National Repository of Grey Literature : 43 records found   1 - 10nextend  jump to record:
See also: similar author names
17 Simek, David
1 Šimek, D.
6 Šimek, Daniel
3 Šimek, Dominik
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