National Repository of Grey Literature 44 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Methodology for predictive mapping of rare and endangered bryophytes distribution in the Czech Republic
Man, Matěj ; Wild, Jan
The methodology introduced certified procedure of using species distribution modelling to support discovery of new localities with presence of rare species of bryophytes and lichens in Czech Republic. The procedure available for general public, it provides algorithms, computation power and environmental data. User provides training data – coordinates of species presence. From the software interface it is also possible to request the coordinates directly from Database of Lichens and Bryophytes (DaLiBor). Georeferenced map is the output form the software. The aim of the methodology is to provide integrated tool for conservation planning and research to promote the bryological and lichenological field survey in Czech Republic. The methodology will help to focus the survey which could make the survey more efficient and cheaper according to money but also human resources. The methodology is based exclusively on free software, mostly open source and free licence. In the Czech Republic, the methodology provides modern software approach to target botanical research. In national practical nature conservation, it is all new application of established procedure from other fields.\n
Methodology of microclimate measurement with TMS microclimate stations
Brůna, Josef ; Wild, Jan ; Hederová, Lucia ; Klinerová, Tereza ; Macek, Martin ; Urbanová, Renáta
The methodology of microclimate measurement contains procedures for creating a representative network of stations on the examples of networks installed in the area of the Šumava National Park. It also deals with procedures for correct data acquisition and processing. The methodology will enable the NP Šumava Administration to continue data acquisitions from the newly created network after the end of the project, or to facilitate the creation of their own network for the study of other research questions.
Methodology of processing hemispherical photographs
Brůna, Josef ; Wild, Jan ; Hederová, Lucia ; Klinerová, Tereza ; Macek, Martin
The methodology of processing hemispherialc photographs is a complex set of activities, starting with the creation of an image with a fish-eye lens, image editing in graphic editors and ending with analysis in specialized software. The obtained data indicate the amount of radiation falling into the undergrowth and the method of processing affects their quality. The procedure developed by the GIS and Remote Sensing Department of BU CAS integrates methods from various programmes into a script in R.
Characterization and focusing of capillary-discharge XUV-laser beam for purposes of thin-film deposition
Pira, Peter ; Wild, Jan (advisor)
Title: Characterization and focusing of capillary-discharge XUV-laser beam for purposes of thin-film deposition Author: Peter Pira Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jan Wild, CSc., Department of Surface and Plasma Science Abstract: The paper deals with the first results of the interaction of a desk-top high repetition rate XUV laser (wavelength of 46.9 nm) radiation with materials suitable for optoelectronics, in particular the ionic crystals CsI, LiF, etc. Using surface physics methods (AFM, DIC Normanski microscopy) pulse laser imprints were investigated. Based on the results obtained, general information on the nature of ablation and desorption was obtained, which were compared with the results of the XUV-ABLATOR modified code modeling. Plasma arising from ablation was examined by a modified Langmuir probe system. The main result is the pulse laser deposition of thin films of Bi and CsI. Keywords: ablation, Pulsed Laser Deposition, XUV laser
Patterns and processes in spatial distribution of plant species across scales
Macek, Martin ; Wild, Jan (advisor) ; Lepš, Jan (referee) ; Zimmermann, Niklaus E. (referee)
In this thesis, I aimed to identify factors shaping plant distribution at different spatial scales, correlate them with environmental heterogeneity, identify causal processes and test general hypothesis on the nature of response curve shapes and species richness patterns. General review of the topic is introduced in the first chapter, followed by five chapters presenting three already published studies and two manuscripts. The first study deals with processes responsible for creation of fine-scaled spatial pattern of spruce seedlings and saplings, emerging after bark-beetle disturbance in mountain spruce forest. Aggregated pattern, replicating previous generation of spruce trees, emerges in consequence to microsite-dependent mortality, as was surveyed through repeated monitoring of the fate of individual seedlings. The second study explores spatial variability in forest understory temperatures at the landscape scale and its relevance for understory plant distribution. As the main source of variability in understory communities we identified seasonal maximum temperatures. Using GIS modelling approach, we created spatially continuous prediction, which outperformed state-of-art climatic grids used currently by ecologists. The third study on the shape of species responses along elevational gradients...
Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef ; Wild, Jan (advisor) ; Romportl, Dušan (referee) ; Kropáček, Jan (referee)
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...
Characterization and focusing of capillary-discharge XUV-laser beam for purposes of thin-film deposition
Pira, Peter ; Wild, Jan (advisor) ; Čuba, Václav (referee) ; Tichý, Milan (referee)
Title: Characterization and focusing of capillary-discharge XUV-laser beam for purposes of thin-film deposition Author: Peter Pira Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jan Wild, CSc., Department of Surface and Plasma Science Abstract: The paper deals with the first results of the interaction of a desk-top high repetition rate XUV laser (wavelength of 46.9 nm) radiation with materials suitable for optoelectronics, in particular the ionic crystals CsI, LiF, etc. Using surface physics methods (AFM, DIC Normanski microscopy) pulse laser imprints were investigated. Based on the results obtained, general information on the nature of ablation and desorption was obtained, which were compared with the results of the XUV-ABLATOR modified code modeling. Plasma arising from ablation was examined by a modified Langmuir probe system. The main result is the pulse laser deposition of thin films of Bi and CsI. Keywords: ablation, Pulsed Laser Deposition, XUV laser
Optimization of a high current pulse discharge in gas filled capillary for application purposes - Ar8+ laser 46.9 nm
Štraus, Jaroslav ; Koláček, Karel (advisor) ; Jančárek, Alexandr (referee) ; Wild, Jan (referee)
The aim of the thesis was to complete the development of the Czech version of the extremal ultraviolet (XUV) argon capillary laser working at the wavelength 46.9 nm and its adaptation for the first practical applications. A multi-discipline complex of mutually interconnected problems was analyzed and studied: The reasons for a capillary low life-time were investigated using defectoscopic methods, a pre- pulse regime influence was studied with the help of spectroscopy on a physical model. By performing necessary construction and technology changes as well as by the multi-parametric optimisation of working regime, the indicated weaknesses were suppressed. The XUV laser was focused into a footprint of the size about 100 µm and the apparatus was extended by a set of practical aids and accessories for special applications, especially for exposition of the samples at extreme temperatures. As practical applications of the XUV laser, measurements of multilayer mirror reflectivity and filter transmissivity were performed. Using the XUV laser for a thin layer deposition and radiation resistance testing was verified to be practicable in principle. Probably a first temperature dependence of an XUV laser ablation rate was measured, in the temperature range from -180 deg.C to +200 deg.C, on BaF2.

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