National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Land snail shell degradation in forest environment
Říhová, Dagmar ; Juřičková, Lucie (advisor) ; Horsák, Michal (referee)
Experimental shell degradation of nine common Central European pulmonate snail species in forest ecosystems in the Czech Republic was investigated. Model shells were deposited for 6, 12, 24 and 36 months in leaf litter of six different places; than removed, dried and photographed. Set of alternations was analysed by CANOCO 4.5 statistical system. Small species degrade different from large ones. Large species corrode outwards, after periostracum disruption the ostracum dissolves and holes appear. Small species corrode out from within, calcium carbonate dissolves and small windows arise. The shell degradation proceeds with different rate on various localities. Some localities have characteristic types of alteration, e.g. peat bog pine forest exhibits ostracum dissolution and periostracum deformation. The ultimate influence of the degradation is caused by pH value and humidity. Shell shape and size have effect on its degradation. Moreover, other important decomposition agents are living animals. Powered by TCPDF (www.tcpdf.org)
On the Nothernmost and Southernmost Limits of European Land Snail Spatial Ranges
Křepelová, Lucie ; Juřičková, Lucie (advisor) ; Horsák, Michal (referee)
The aim of this work was to evaluate the limits of ranges of European land snail species along the north-south gradient. To work out the document it was necessary to prepare the set of digitalized maps, that enabled to create the database of ranges of the individual land snails species. Based on obtained data I tried to identify places where the northern and southern borders of species ranges are the most frequent. The landsnails' ranges are affected not only by particular life requirements of the individual species (potential limits), but also by other conditions, especially climatic, geographical and historical (truncated limits). In this work I focused on their differentiation. Above mentioned process also enabled me to track the north- south changes in species richness of the landsnails taking into consideration the truncated and potential limits. The most important natural barriers constraining that numerous of species cannot naturally widespread from the south to the north are the Scandinavian Mountains, the Alpes and the Carpathians and suprisingly also southern borders of german and polish lowlands. On the other hand, spreading of the species form the north to the south is limited only by the Alpes. I also tried to distinguish the group of species whose ranges are not influenced by these...
Mobile Machineries Used for Modification of Agregates and Recycled Materials from Building Waste
Turčinek, Andrej ; Horsák, Milan (referee) ; Škopán, Miroslav (advisor)
This bachelor's thesis deals with the problem of selection of a new crusher for a smaller recycling company and the comparison of the old variant of the production line with the new one thanks to the increasing part of recycling in the construction industry. In the introduction, this is a general overview of the technological line, the requirements for aggregates and types of crushers. The actual work consists in acquainting with a specific technological line for the treatment of the construction waste, the selection of suitable substitution for this line and the subsequent comparison of the old and the new variant. As it is a relatively new industrial sector with rapid development, the main benefit of the thesis is the outline this industry sphere in 2017.

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