|
| |
|
|
Geophysical survey of undermined area in Lukavice near Chrudim
Slavíčková, Michaela ; Blecha, Vratislav (advisor) ; Dohnal, Jiří (referee)
Lukavice village is located in Eastern Bohemia and it is known for its historical pyrite mining. The first mention of mining comes from the beginning of 17th century. The mines were abandoned in 1892 due to a significant depletion of the upper parts of the deposit and also because of the competition of cheaper pyrite from abroad. Old mine workings were often backfilled incompletely and their exact location is unknown. The occurrence of empty mine workings under the roads in the village centre could cause a collapse of the ground under the weight of heavy trucks which carry through Lukavice village aggregate from the nearby quarry. The aim of geophysics was to determine the thickness of dump material (seismics), subsidence monitoring in the village centre (repeated levelling) and the principal aim was to locate old mine galleries and shafts (gravity survey). Gravity measurements did not prove the presence of empty mine workings under the main road at the village centre. Most pronounced negative Bouguer anomaly, which occurs in the vicinity of Bartolomějská jáma schaft, may be caused by higher degree of alteration of underlying porphyroids. According to historical maps and photos we determined approximate location of the former water pit Vilemina. For the determination of the exact position of the...
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
CFD simulation of pressure pulse propagation in twin scroll volute with shifted divider
Dohnal, Jiří ; Tuhovčák, Ján (referee) ; Katolický, Jaroslav (advisor)
The main subject of this Master’s thesis is a review of turbo-charger efficiency with split turbine channel in the process of various types of supercharging and also with diverse designs of so called divider of turbine channels. I used CFD simulation utilizing Star CCM+ software. A model of turbocharger and mesured data came from commercial model. Efficiency is evaluated on the basis of performance distributed to the turbine with similar input conditions for both steady and unsteady process. For better understanding of this subject I also included theoretical basics of supercharging of combustion engines and fluid dynamics.
|
|
|
Ejectors, its design and utilization
Dohnal, Jiří ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
This bachelor’s thesis deals with the area of ejectors. These machines are included in a group of a jet pumps, introduced in the first part of thesis. In the next part is an introduction of ejectors, their principal, characteristic, its design and function and differences of using gas and liquid in different combinations of driving or drifting medium. The most extensive part is about utilization in industry, medical care and other parts of life. In concluding part are some equations and laws using in design of ejectors. The biggest problem is their efficiency.
|
|
|
The Methodology of Identification of Cultural Artefacts in Landscape
Dohnalová, Barbora ; Fiřtová, Barbora ; Kučera, Petr ; Dohnal, Jiří ; Pavlačková, Katarína
The methodology of identification of cultural artefacts in landscape is a tool to recognize and sort different artefacts - small objects and elements in landscape. Those, who have cultural values and participate in creating uniqueness of the place and help to discover its identity. Creating the typology of the cultural artefacts according to this methodology enables the municipality to recognize as a value also the objects without legal protection, take care of them during for example spatial planning process and renew their authenticity in tertiary landscape structure.
Fulltext:  PDF
|
guest ::
RSS feed.