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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Trendy v designu a tvorbě nových materiálů / Trends in the design and creation of new materials

Rodrová, Veronika January 2016 (has links)
The objective of my research is to examine the influence of densified wood in combination with native wood on its mechanical properties such as moduls of elasticity, bending strength, limit of proportionality, bendability coefficient and tensile-shear strength of glued line. The examined woods are Europen beech (Fagus Sylvatica L.) and Aspen (Populus tramula L.). The tests were carried out on speciemens with different thickness. The densification by 10% and 20% was performed. For the glued joint polyurethane adhesive and polyvinylacetate glue were used. The thesis includes simulation of the properties, their computer program tetsing, and the comparsion with the values obtained from real measurement. The purpose of this part of thesis is to achieve a simulation that will replace laboratory tests or disprove this method of scientific research and deepen our knowledge of proceses occuring during the pursued way of stress.
2

Vliv technologických faktorů na tvrdost dřeva / Influence of technological factors on the hardness of wood

Šafaříková, Lenka January 2016 (has links)
Focus of the diploma thesis is to investigate the influence of the selected factors (type of wood, thickness, densification) on the wood hardness. For the experimental measurements the Brinell hardness test method was used. The hardness measurements were performed on the specimens made from two different types of wood. Obtained results were statistically analyzed into the graphs. The main goal of the thesis was to determine the change in the static hardness in dependence on the previously mentioned factors. From the experimental data it can be seen that the wood hardness increases with the higher degree of densification . This phehomenon applies to both investigated wood materials which are European beech (Fagus sylvatica) - hardwood specimen and European aspen (Populus tremula) - softwood specimen.
3

Mechanické vlastnosti lamelového materiálu / Mechanical properties of the lamellae materials

Vokatý, Vojtěch January 2016 (has links)
This thesis evaluated experimental research on the influence of selected factors (species, thickness, density, number of stress cycles) on the specified material characteristics (modulus of elasticity, modulus of rupture, limit of proportionality, bendability coefficient). The measured values were statistically evaluated and expressed in tables and graphs. Beech (Fagus Sylvatica L.) was selected to represent hardwood and aspen (Populus Tremula L.) softwood. Tree species affects all observed characteristics. The results show that the modulus of elasticity increases with increasing densification of the material, but decreases with the increasing thickness of the material. A similar dependence is observed even with the modulus of rupture and limit of proportionality, which is also dependent on the number of cycles. The bendability coefficient is affected by material thickness. It is expected that based on the evaluation of the results it will be possible to design materials with tailored properties.
4

Trendy v designu a tvorbě nových materiálů / Trends in the design and creation of new materials

Kašičková, Václava January 2016 (has links)
Thesis investigates the flexural properties of modified laminated wood. Thesis examined two wood species - beech and aspen. The aim was to describe effect of wood species, material thickness, densification, adhesives and loaded cyclic stress on selection of mechanical properties. Wood species and thickness of material were determined as factors with very significant impact. They affected modulus of elasticity, limit of proportionality and bending strength. All these characteristics achieved higher values while testing beech lamellas. Degree of densification does not appear as a very significant factor. Comparing modulus of elasticity in this thesis and data given in the literature it is possible to say that densified lamellas used in this research reached higher values. This thesis also investigates tensile-shear strength and bendability.
5

Hranice – redefinice městské struktury / Hranice – redefinition of urban structure

Uherková, Ivona January 2019 (has links)
The diploma thesis Park and Ride deals with the design of a car park in the town of Hranice, which is known mainly for its important transport train node and Hranice Abyss. The city now suffers from the high intensity of car traffic in the city center due to insufficient street network. This network is disrupted by a four-lane road that was built in the 1980s and cut natural transport links. The abolition of the four-lane road, which is now lacking in transport services, releases a large amount of development area, which is primarily used as an agri-recreational area. Part of this green belt is the parking house, which prevents the entry of surplus cars into the city center. The parking house is a new transport hub of the city, which also includes elements of alternative transport - transfer to public transport or bicycle, which makes it possible to create a city center pleasant for pedestrians.

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