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Auxiliary inverters for electric traction
Polášek, Petr ; Pazdera, Ivo (referee) ; Červinka, Dalibor (advisor)
This thesis concerns with specified problems of an electric traction. It deals with the concept of module controlling EC motor of the voltage 24V and the current 100A. There are described possibilities and principles of controlling EC motor in detail. For controlling, the single-purpose IO MC33035, which is directly specified for it, is used. The thesis describes implementation of both testing and final versions of converter for a circulating pump drive of a cooling circuit in locomotives. The convertor is partly universal and can be used in other applications. According to the implemented convertor, a laboratory test and a model protocol were made. In the second part, the concept is described as well as the implementation of DC/DC conventor of output voltage of 24V and which is supplied by 12V battery. The specified output current is 4A. It is used for supplying of the controlling traction vehicle unit and is installed as a boost convertor which contains a resonance conventor. The presentation of measured parameters of the complete convertor is either a part of this thesis.
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Incentives leading companies to certification of ISO 14001
Polášek, Petr ; Vejchodská, Eliška (advisor) ; Louda, Jiří (referee)
Aim of the thesis is to define, characterize, structure and analyse incentives that lead firms to undergo and keep certification of the voluntary environmental standard ISO 14001. Following hypothesis was formulated in line with chosen aim: firms certify themselves with ISO 14001 mainly due to necessity of implementation of environmental elements to corporate governance in line with sustainable development. Outcome of the retrievel part of the thesis is to clearly define and well structure incentives that lead firms to certification. Subject matter experts from different certified companies assign to these incentives scales using staistical pairwise comparisons called Fuller's triangle. Based on the scales and order is confirmed or denied formulated hypothesis.
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Emise ze spalování biopaliv
Vysoká škola chemicko-technologická v Praze, Fakulta technologie ochrany prostředí, Ústav plynárenství, koksochemie a ochrany ovzduší ; Státní zkušební ústav, Brno ; České vysoké učení technické v Praze, Fakulta strojní, Ústav mechaniky tekutin a energetiky, Praha ; Onderek, R. ; Paulas, Viktor ; Hrdlička, Jan ; Koutský, Jiří ; Havránek, Josef ; Jedlička, Milan ; Polášek, Pavel ; Dlouhý, Tomáš ; Hrdlička, František
V r. 2004 byly provedeny všechny plánované organizační a výzkumné práce: 1. V tepelné laboratoři řešitele pro provádění krátkých zkoušek s peletizovanými biopalivy byl instalován nový kotel Verner na spalování pelet; 2. na tomto kotli byla zopakována série zkoušek s peletizovanými palivy, která již proběhla na kotli VIADRUS; 3. byl proveden základní rozbor podmínek vzniku perzistentních organických látek při spalování biomasy a mechanismy možného vzniku těchto látek při spalování produktů, které primárně tyto látky neobsahují (biomasa); 4. v rámci krátkých spalovacích zkoušek byl proveden prvkový rozbor vstupního materiálu; 5. v rámci krátkých spalovacích zkoušek byl proveden odběr pevných zbytků po spalování a byl proveden prvkový rozbor těchto zbytků, a to včetně stopových prvků; 6. pro objasnění vlivnosti typu biomasy na možný obsah stopových prvků byly použity pelety ze šťovíku získaného od producentů z lokálně velmi vzdálených pěstebních míst s vysokou pravděpodobností rozdílného složení půdy v těchto lokalitách.
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Vliv východního rozšíření EU na obchod vybraných nových členských států se třetími zeměmi (Trade Effects of the East Enlargement in the CEECs)
Polášek, Petr ; Němcová, Ingeborg (advisor) ; Joklová, Kateřina (referee)
The thesis analyses the effect of the Eastern enlargement on goods flows into four CEECs. In the beginning, the Eastern enlargement and numerous related economic effects are briefly characterised. After that it focuses on trade diversion and trade creation effects, starting with a concise discussion of the traditional customs union theory and followed by the explanation of the choice of the estimation method. A gravity model applied on a panel data set is then used to model the import flows into the EU15 and the Czech Republic, Hungary, Poland and Slovakia. The results showed that a careful choice of the model specification and estimating technique is needed and the model that controlled for four sources of unobserved heterogeneity (time, country pair, importer, and exporter specific characteristics) was chosen. Based on this model's results, we could expect a significant increase of imports from EFTA into these countries but aggregately we should not expect any trade diversion as no further redirecting of import flows from the rest of the world is predicted. Eventually, some of the real trade flow developments (territorial and commodity structures and revealed comparative advantages of selected regions) are described.
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Ways and opportunities of restoration human-harmed areas
Polášek, Petr ; Dvořák, Antonín (advisor) ; Hadrabová, Alena (referee)
Bachelor thesis under the name "ways and opportunities of restoration human-harmed areas" focuses on methods and types of restoration that can be used for the areas harmed by raw material extraction and mainly for the waste dumps restoration. Except the description of the methods and types of restoration activities the thesis summarizes technological procedures, processes and conditions that are fundamental for the particular types of restorations. In the practical part of the thesis is introduced waste dump in Radim -- its history, current status and plan of the restoration after the first fase is closed down. Last but not least the thesis informs about economical aspects of appropriate types of restoration -- it quantifies the restoration expenses depending on the type and methods used for the respect restoration project. It brings examples of many economical aspects that are advantageous mainly for municipality that can based on this fact realize extra investments for their citizens delight.
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