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Fate of microplastics in soil
Kameníková, Eliška ; Řezáčová, Veronika (referee) ; Kučerík, Jiří (advisor)
The problems with microplastics, small plastic particles contaminating the environment, is a subject of heated discussions today. It has been recognized that the microplastics are not inert, but instead they have an impact on all enviromnental compartments. There are studies describing the negative effects of microplastics, for example on fauna and flora or on human health, but the effects on soil quality have not been sufficiently described. The aim of this thesis was to assess the short and medium term effects that microplastics could have on the soil. In this work, a series of experiments were performed to elucidate the fate of microplastics in the soil. Changes in soil organic matter thermal properties, soil respiration, amount of water and soil aggregation depending on the incubation time were monitored. Three types of agricultural land (chernozem, cambisol and phaeozem), which were contaminated with different concentrations od PET and tyre rubber, were tested. The results confirmed the specific effects of microplastics on soil properties, which were observed in non-incubated samples (i.e. at the time of incubation 0 months), microplastics did not behave inertly in the soil and affected, for example, soil properties, texture and respiration.
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Tyre Radial Stiffness Measurement
Novodomský, Tomáš ; Vančura, Jan (referee) ; Hejtmánek, Petr (advisor)
This thesis deals with the radial stiffness of a tyre. The first part of is devoted to a brief description of a tyre construction. The next part is devoted to measuring the radial stiffness of a tyre and the design of a new measuring device. The last part of the thesis deals with the influence of the radial stiffness of a tyre on the vertical dynamics of ta vehicle and simulations of this effect in the MATLAB / Simulink software.
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Design of Device for Tyre Rolling Resistance Measurement
Piskoř, Martin ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The aim of this thesis is a construction concept of tyre rolling resistance measuring device. The first part deals with the rolling resistance. It describes its causes, its influential factors and it also includes rolling resistance identification methods. The second part deals with construction design of the rolling resistance measuring device itself. It contains stress analysis, and fatigue analyses as well. It includes selection of transducers used for tyre rolling resistance measuring and also measurement error analyses. The last part focuses on estimated financial requirements connected with producing and assembling the designed measuring device.
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The study wheeled undercarriages of mobile machines
Olšovský, Petr ; Škopán, Miroslav (referee) ; Kašpárek, Jaroslav (advisor)
The objective of this bachelor thesis is to summarize basic findings regarding various types of wheeled undercarriages that are used on contemporary machines. The first part of this paper deals with numerous requirements that should be fulfilled by the design of an undercarriage. The fulfilment of these requirements also helps to assess whether the design should be used for a specific machine. Another focus of this paper is to summarize all design solutions regarding propulsion, tyres, stabilizing elements and steering mechanisms. These solutions are compared to each other. Important design elements of wheeled undercarriages are described as well.
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Life termination of automotive tires
Poul, Ondřej ; Dvořáček, Jiří (referee) ; Brandejs, Jan (advisor)
Objective of this bachelor thesis is characterization of pneumatic tyre abolition. Discarded tyre amount detection, methods and possiblities of recycling and its evaluation is related. Part of the thesis is also reasoning on next utilization of the materials. Conclusion includes delimitation of future developments.
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Stanovení procenta recyklace pneumatik ve vazbě na technické a ekonomické možnosti získaných produktů
ECO trend, s.r.o., Praha
Přílohová část obsahuje: Příloha 1: Terminologie. Příloha 2: Směrnice Rady 99/31/EC z 26. dubna 1999 o skládkování odpadů. Příloha 3: Směrnice Evropského parlamentu a Rady 2000/76/EC ze dne 4. prosince 2000 o spalování odpadů. Příloha 4: Směrnice Evropského parlamentu a Rady 2000/53/EC ze dne 18. září2000 o vozidlech s ukončenou životností. Příloha 5: Slovenský recyklační fond. Příloha 6: ETRA The European Tyre Recycling Association - základní informace. Příloha 7: Přehled starých zátěží. Příloha 8: Analýza zpětného odběru některých výrobků v roce 2002. Příloha 9: Zpětný odběr některých výrobků v roce 2003 - průběžná zpráva.
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