National Repository of Grey Literature 139 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Evolutionary processes responsible for complexity in aquatic vascular plants
Prančl, Jan ; Kaplan, Zdeněk (advisor) ; Oberprieler, Christoph (referee) ; Štech, Milan (referee)
Aquatic plants are a heterogeneous assemblage of species that, although surviving in similar habitats, have evolved from very different genetic and ecological backgrounds. However, many aquatics share a number of anatomical, morphological, metabolic and reproductive adaptations, which have arisen independently in remarkable similarities (through convergence and parallelisms) in many unrelated groups. Despite their evolutionary uniqueness, aquatic plants are markedly underrepresented in contemporary biosystematic studies. Moreover, the taxonomic evaluation of numerous aquatic plant groups is intricate due to the strong morphological reduction and a high degree of phenotypic plasticity. This thesis focuses on two notoriously challenging aquatic plant groups, Callitriche and Ranunculus sect. Batrachium. The combination of several approaches (genome size estimation, chromosome counting, sequencing of nrDNA ITS and plastid trnT-trnL regions, examination of herbarium collections) was applied in order to improve our knowledge on principal evolutionary processes such as hybridization, polyploidization and cryptic variation and demonstrate their role on the shaping of overall aquatic plant diversity. The distribution of particular species in the Czech Republic was mapped for the first time. For both groups,...
Modification of a four cylinder diesel engine to a single cylinder test engine
Mátyás, Attila ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This thesis deals with modification of an existing four-cylinder diesel engine to a singlecylinder research engine. The work is divided into four main parts. The first part is theoretical, briefly describes research engines, their individual types and provides an overview of their functions. The second part of the work includes the modification of a four-cylinder diesel engine to a single-cylinder research engine, focusing mainly on balancing inertia forces. The third, most extensive chapter contains the structural analysis of the crankshaft. The last part contains the design of a torsional coupling, which ensures the connection of the engine with the dynamometer.
Powertrain of four-cylinder in-line gasoline aircraft engine
Novák, Vít ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The focus of this work is to determine the stress of the crank mechanism of the inverted piston aircraft engine Walter Mikron III C UL from the manufacturer PARMA - TECHNIK, s.r.o. The main method of calculation is the numerical finite elements method using the program ANSYS Workbench, the module Static structural and Transient structural. The approximate indicated cylinder pressure during the duty cycle was determined in the GT-SUITE software. The partial goals are to propose possible modifications in the construction of the crank mechanism and to state the possible power reserves of the engine. The diploma thesis also briefly summarizes the history and development of aircraft piston engines from the company Walter, which developed the engine, and the line of Walter Mikron engines.
Six-cylinder in-line diesel engine with cylinder deactivation
Novosád, Ivan ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
Master 's thesis deals with design of a drivetrain of six cylinder inline engine with cylinder deactivation for heavy agricultural vehicles. In this thesis were devised various possibilities of crankshaft balancing, the best design solution of counterweight was based on optimization in software Catia. Further, the crankshaft was analysed for force and momentum loading and torsional vibration, based on which, the torsional vibration damper was designed. There were considered several options for cylinder deactivation, which were analysed for finest run of engine and the best thermal distribution. Based on these criteria, the best option was to deactivate 2nd and 5th cylinder. The crankshaft was analysed for the fatigue failure by finite element method. The fatigue failure is the most dangerous case for the crankshaft, the resulting safety factor for this limit state is 3,05.
Chassis design of a kart
Pykal, Filip ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis deals with construction solution of a go-kart. In the first part of this thesis I started to design the main frame of the go-kart so that it would fulfill specific criteria. Then I designed all the functional parts except for the engine. I payed attention that the montage and service work would be as easy as possible. I also made an analysis of the rear shaft.
Motorcycle renovation
Štěpán, Radim ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
The main aim of bachelor thesis is to do a list of operations and knowledges for successful renovation of the ČZ 175 monoblock, motorcycle from 1935. The thesis starts with history of Česká zbrojovka until 1953. It continues with a theoretical list of information for the successful renovation of the body and engine, including a computational and design model of the engine cylinder head. The last part is the work done on the motorcycle, the production of missing parts of the motorcycle and the overall rough estimate of the price of motorcycle renovation in terms of material and time.
Modifying the Babetta engine
Poulíček, Matěj ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
This bachelor thesis is about one of the possible modifications of two-stroke single-cylinder Babetta 210 engine for increasing of power. Further about another manufactured Babetta engines with focus on their pros and cons. Attention is paid also to possible design changes for elimination of drawbacks.
Ignition engine emissions
Semela, Lukáš ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
This thesis deals with emissions of ignition engines. The introduction acquaints the reader with the history and lays out the reasons why it is a crucial topic to be dealt with. Furthermore, the term emission is being explained as well as the description of its chemical composition, the impact on the environment and human organism. The method of measuring is also mentioned in this thesis. Then the explanation continues with European Union’s current legislation. The whole thesis is concluded with information on the additional modification of emissions and chapter that outlines the future of automobiles regarding the environment.
Two-stroke engine
Štrba, Matej ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
The aim of this thesis is description of a design, development of a two-stroke engine, its modernization, possibilities of the modifications and thus the change of the performance parameters and subsequent applications of some modification on the engine of passenger car Trabant.
Automotive differentials
Holeňa, Vít ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
This bachelor thesis is about automotive differentials. The aim of thesis was to create an overview of various types of differentials, primarily self-locking. First chapter is dedicated to transmission of which the differential is a part of. Second chapter is about differential function in general. In third chapter, attention is paid to self-locking differentials, especially to Torsen differentials. Last of all, fourth chapter is about active differentials and systems, which help us to overcome disadvantages of differentials mentioned above.

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