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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.
21

Reverze pohlaví u ještěra s genotypově určeným pohlavím (Squamata: Acrodonta: Pogona vitticeps) / Sex reversion in the lizard with genotypic sex determination (Squamata: Acrodonta: Pogona vitticeps)

Ehl, Jan January 2015 (has links)
Sex determination among reptiles is a very variable matter across it's taxa. We meet there temperature sex determination and genotypic sex determination with many independent transitions between them. It is a group suitable to study evolution of sex determination, sex chromosomes and sex determination genes. Rare cases of sex reversal caused by extreme incubation temperature or exogenous hormones have been reported in recent years. In case of Acrodont lizard, Pogona vitticeps, was reported sex reversal caused by high incubation temperatures. Our purpose was to repeat the experiment, mainly due to insufficient conclusiveness of used methods. We wanted to expand the experiment by hormonal reversal, studying persistence of sex reversal to maturity and fertility of reversed individuals. We managed successfully to demonstrate sex reversal in both treatments by histological examination. Individuals with discordant phenotypic and genotypic sex were breed till one year of life, which demonstrate persistence of reversal. Our outcomes are concordant with most recent work on this species and show full functional phenomenon of sex reversal with reptiles, which studying could contribute to our understanding of evolution of sex determination.
22

Středně dobá předpověď průtoků vody měrným profilem toku / Long Term Discharge Prediction in River Hydrometric Profile

Šelepa, Milan January 2015 (has links)
The diploma thesis is focused on the long term prediction of mean monthly flows in hydrometric profile for purposes of reservoir control optimization and optimization of reservoir systems. Discharges were predicted using by artificial neural network method. Predicted flows were statistically evaluated by relevant coefficients and then compared with the measured flows for given river hydrometric profiles.
23

Popis vazby průtoků a plavenin ve vybraných profilech vodních toků / Description of Relation between Flow and Suspended Sediment Load in a Hydromertic Profiles of a Selected Rivers

Bobková, Dominika Unknown Date (has links)
The issue of the relationship between water discharge and the suspended sediment loads is a globally highly addressed topic. Knowing the suspended sediment loads in the streams avoids problems with over-filling of water cannons and thus prevents insufficient capacity of water reservoirs. This thesis is partly a follow-up to the bachelor thesis, which extends and introduces new procedures. Neural networks, more specifically multilayer perceptron neural networks, are used to analyse the relationship between water discharge and suspended sediment loads. The results of the networks are then processed in Excel into graphs and evaluated using the coefficient of determination, Nash-Sutcliffe coefficient and RMSE coefficient. The practical application is solved on two profiles - the profile Podhradí nad Dyjí and the profile Židlochovice. Each profile is examined in a different period.
24

Mohou místní akční skupiny v ČR plnit roli strategického partnera menších obcí pro uplatňování prvků strategického vládnutí na venkově? / Can Local Action Groups at Czech Republic take a role of the partners of small municipalities in applying strategic governance at countryside?

Skála, Vít January 2009 (has links)
Diploma thesis "Can Local Action Group play an important role, like partner at strategic planning, to countryside municipalities at Czech?" seeks answers to this question. The discussion about definition of countryside and its problems is described at the beginning of the thesis as actual and previous politics as well. Description of Czech constitution connected to countryside is mention next to it. After that, there is described the LEADER method and comparison between using this method at 5 different European countries. The tree of problem and actors analysis is provided later on. The short description of the theories using at thesis outputs is provided as well. The used theories are: bureaucracy theory, theory of social capital, theory of cultural determination, governance theory and policy network analysis. The describing of outputs from realized primary research is the main part of the thesis. There were carried out 17 structure talks in qualitative research and processed 509 questionnaires in quantitative research. The lot of tables and graphs are attached. Finally the 3 scenarios, like a suitable form for such a complex topic, were composed to describe answer at the primary question of this thesis in its context and complexity.
25

Kalibrace nepřímých metod pro zjišťování vlastností alkalicky aktivovaných betonů / Calibration of indirect methods for maesurement of properties of alkali activated concretes

Vrba, Pavel January 2014 (has links)
This work solves creation of calibration relations to determine cube compressive strength, dynamic and static elastic modulus of alkali-activated concrete by non-destructive methods. Alkali-activated concrete is spoken of as a new material used in civil engineering. It shows different properties than normal concrete based on Portland cement. That's why the modification of common calibration relation seems necessary. Fresh concrete was made in the concrete plan ŽPSV a.s., Uherský Ostroh in three mixtures and always in the number of 18 cubes and 3 prisms. The samples were tested by impact hammer Schmidt type L, type N, SilverSchmidt PC-N and by ultrasound in 6 time periods of three specimens. After that, the cube compressive strength was determined. Status of static elastic modulus was determined in a time period of 28 days. The results are calibration relations to determine the progress of compressive strength and modulus of elasticity for each method and their combination.

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