National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Shadow effect on solar systems characteristic
Dus, Ondřej ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This work deals with study of shadow effect on solar system characteristic. The general aim is to design and create solar module for study of shadow effect and measurement under solar simulator.
The influence of environmental factors on abundance of conservation important species in Tetínské skály Nature Reserve
Augustinová, Šárka ; Tichý, Tomáš (advisor) ; Křenová, Zdeňka (referee)
Tetínské skály Nature Reserve is one of the major sites for the presence of protected species, which are Dianthus gratianopolitanus, Saxifraga rosacea subsp. Sponhemica and Saxifraga paniculata. My goal was a field survey and data collection about the incidence of these species on the surfaces of rock walls, followed by identification of key environmental factors and description of their impact on the species. Such survey has not been conduncted so far. I used mainly multivariate analysis, PCA and RDA and One-way ANOVA to determine the interrelationships. The analysis results showed significant differences in species abundances influenced by different combinations of environmental factors. The factors with significant influence include cardinal direction. The highest proportion of species abundances showed areas of eastern orientation. Another important factor was shading from vegetation, which proved to have strong negative impact on abundace, especially for species S.rosacea subsp. sponhemica and D. gratianopolitanus. These two variables indicate a preference for sunny areas. Other factors with a significant influence on the occurrence of species are also a presence of soil surface rock wall and a presence of gardens in the area over the rock wall, which greatly increased the proportion of...
Shadow effect on solar systems characteristic
Dus, Ondřej ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This work deals with study of shadow effect on solar system characteristic. The general aim is to design and create solar module for study of shadow effect and measurement under solar simulator.
Use of image analysis in the monitoring of critically endangered species Spiranthes spiralis
IPSER, Zdeněk
A population of an endangered orchid species Spiranthes spiralis was discovered in 1980 in the National natural monument Pastviště u Fínů in village Albrechtice, near Sušice. Since 1985 the number of flowering individuals of this population has been regularly monitored. Since autumn 1998 all the specimen found there have been marked and biometrically measured. Since the beginning of monitoring, big fluctuations in the number of flowering specimens or in survival of the individual plant rosettes have been observed among the years. The aim of this thesis was to design the so called index of shading and to verify the possibility of its use to explain some phenomena of plant population dynamics. The index was designed with image analysis and biometric data. The hypothesis has been tested, that the basic variable determining the plant{\crq}s fitness (survival, flowering, vegetative propagation etc.) is the rate of shading by neighboring vegetation (expressed with the index of shading). It has been found that the effect of shading on flowering is not significant or hidden by other factors (such as the course of the weather in the season etc.). The size of the leaf area affects the probability of flowering, number of blooms and height of the inflorescence stem. My thesis also focused on costs of flowering, survival probability (since 1998) and flowering dynamics (since 1986).

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