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Laser cooling of the trapped ions for frequency and time metrology
Číp, Ondřej ; Pham, Minh Tuan ; Čížek, Martin ; Lešundák, Adam ; Hucl, Václav ; Hrabina, Jan ; Řeřucha, Šimon ; Jedlička, Petr ; Lazar, Josef
In the laser cooled trapped ions field current research is oriented to yield isolated ions in their basic state of the motion. The detection of the Doppler cooled iont excitation to its quadrupole transition of the electronic structure gives the opportuniny to stabilize highly coherent lasers of the optical frequency of the hundreds of THz. This way a new standart of the time or optical frequencies called „Optical atomic clock“ can be defined. Institute of the Scientific Instruments in Brno in the cooperation with the Department of the Optics of the Palacky University in Olomouc implemented a unique research infrastructure for laser cooling of 40Ca+ ions and subsequent experiments of the quantum mechanics and spectroscopy in a joint laboratory in Brno. Currently 40Ca+ ions are routinely generated and captured. The Doppler cooling of those ions is performed using dipole transition at a wavelength of the 397 nm. Also detection and spectroscopy of the electronic structure of the ion and the presence of his dark resonances is implemented.\n
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Impact of horizontal and vertical pattern of habitats on birds diversity
Schovánková, Hana ; Šímová, Petra (advisor) ; Moudrý, Vítězslav (referee)
This diploma thesis follows up the influence of horizontal and vertical structure of biotopes on biodiversity of bird species of Czech Republic of forest and open sites. Vertical structure model was created from digital model of surface of Czech Republic (1st generation) and digital model of relief of Czech Republic (5th generation). Information about horizontal structure were derived by analyzing aerial imagery. Then single variables were detected from these data. Subsequently, it was analyzed which of these variables and which way influence bird diversity. On both types of sites was found increasing bird diversity with increasing diversity of vertical structure. With increasing horizontal structure, however, bird diversity significantly increased only on open sites. The influence of other characteristics was mostly different on bird diversity of open and forest sites, but, for both types of sites, the positive influence had for example edge density of land cover categories or edge density of height categories. Additional part of this thesis was to explore if vertical characteristics of biotopes could influence prediction of selected bird species. Results was different in forest and open biotopes, nevertheless in both types of sites was found potential use of both horizontal and vertical variables.
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Integrative landscape assessment
Sedmidubský, Tomáš ; Martiš, Miroslav (advisor) ; Skaloš, Jan (referee)
The ability of landscape to provide services assisting mankind and to directly or indirectly promote it, has witnessed a dramatic decline due to an intensive anthropogenic use of landscape. The interference with the functionality of landscape notwithstanding the measures aimed at protecting landscape and its elements constitutes a response to the economic development and strive for economic profits. The economic development causes (monetarily) 3 calculable damages which are not included in economic balances and decisions concerning activities carried out in landscape. This doctoral thesis aims at contributing to the solution of this issue by developing and testing an integrative assessment method which integrates a complex of circumstances as a starting point for evaluating landscape in terms of its environmental quality.
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Historic analysis of landscape pattern in context of water erosion risks
Freiman, Jan ; Skřivanová, Zuzana (advisor) ; Klouček, Tomáš (referee)
Abstract Disertation Historic development of landscape structure in the context of the potencional treatened earth water erosion, discribes the process of changes with usage landscape, which took place in cadastral area Vráž u Berouna, Tuchoměřice and Lanžov in královohradecký region. Total expanse all of these areas is 2 315,8 ha.
Selecting areas was held on the planned complex landscaping, becouse of practical use of the change of landscape, which had an impact on water erosion. Pictures, which were chosen for this job are from 1952, 1975 and 2003. The reason for choosing these pictures are equal distance and that the most important influence on remoulding the landscape which have taken place since the 50s of the 20th century due to agriculture collectivization.
Content of literary reserch is to approach the basic concepts, which have connections with the landscape and the assessment its structure including USLE, which deals with the calculation of erosion. For calculation of processes and changes in the landscape exist many tools and methods. In this work ,is analysis and calculation of erosion done with help of geographic informatiom system (GIS). Very important part of this wokr is to interpret the results in the form of map output, tables and graphs.
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Financial Analysis of Recruitment Agency
Strádalová, Veronika ; Pánková, Ludmila (advisor) ; Michal, Michal (referee)
Thesis on Financial Analysis of Recruitment Agency examines selected recruitment agencies focusing on agency employment in the Czech Republic and the Slovak Republic in the period from 2010 until 2014. The theoretical part provides general knowledge about the labor market, recruitment agencies and technical financial analysis. The second part is based on the application of general knowledge and evaluates achievements of their evolution in time. To evaluate the evolution of the number of current employees are used elemental characteristics of time series. Based on the data obtained is made a forecast for the development of the number of employees in 2015 and 2016, including an analysis of the structure and evolution of employees by selected characteristics. For assessing the financial health of both recruitment agencies uses horizontal and vertical analysis of financial statements, profitability ratios, liquidity, activity, and indebtedness including comprehensive view of the financial stability of the company using Altman Z'skóre. After a financial analysis of both recruitment agencies thesis presents a comparison on the evolution and structure of employees, assets and capital structure, financial ratios and bankruptcy model.
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Automation of Exoscopic Analysis Using Image Processing of Sedimentary Grains Acquired by Electron Microscope
Křupka, Aleš ; Křížek,, Marek (referee) ; Baroňák, Ivan (referee) ; Říha, Kamil (advisor)
This thesis deals with image analysis methods which can be exploited in exoscopic analysis of sedimentary grains, specifically for the purpose of distinguishing between geomorphologic geneses which influenced a form of sedimentary grains. The images of sedimentary grains were acquired by a scanning electron microscope. The main contribution is the proposal of multiple methods that can significantly automate the exoscopic analysis. These methods cover the automatic segmentation of grains in image, the automatic analysis of roundness of 2D grain projection and the classification of geomorphologic geneses according to the grain surface structure. In the section concerning the automatic segmentation, a segmentation method enabling an easy subsequent manual result correction was proposed. This method is based on the split-and-merge approach. The individual steps the procedure were designed to exploit specific properties of sedimentary grain images in order to obtain the best segmentation results. In the section concerning the automatic roundness analysis of 2D projection of sedimentary grains, an influence of pixel resolution on a result roundness value was evaluated. Further, a minimal number of grains, which is necessary to analyze in order to reliably compare a pair of geomorphological geneses, was investigated. For the determination of this number, a method was proposed and experimentally verified. In the section of automatic analysis of sedimentary grain surface structure, a method for classification of geomorphologic geneses was proposed. The method utilizes low-level texture features which describes individual images of sedimentary grains. A model of geomorphological genesis is constituted of a set of histograms representing occurrences of different configurations of low-level texture features. The methods proposed in the thesis were tested and evaluated based on a database, which consists of sedimentary grain samples from 4 different geomorphological geneses (eolic, glacial, slope and volcanic).
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Electrochemical etching of silicon
Vrzal, Pavel ; Voborný, Stanislav (referee) ; Šamořil, Tomáš (advisor)
The electrochemical etching is very used technique for semiconductor materials modification. Different structures which find applications in many fields (biotechnology, nanotechnology or electronics) can be prepared by this technique. The task of bachelor’s thesis was preparation of porous silicon using electrochemical etching. At first, a study dedicated to porous Si was carried out. Experimental part of this work deals with a design of etching cell which was used for preparation of porous silicon by electrochemical etching. In addition, the porous Si was prepared by metal assisted chemical etching. Subsequently, created structures were analyzed by scanning electron microscopy. Photoluminescence properties of porous silicon were studied as well.
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Identifikace historické sítě prvků ekologické stability krajiny: Identifikace historické sítě prvků ekologické stability krajiny na mapách vojenských mapování
Univerzita Jana Evangelisty Purkyně v Ústí nad Labem, Laboratoř geoinformatiky, Ústí nad Labem ; Čihák, Jan ; Buchta, Ivan ; Uhlířová, Lenka ; Brůna, Vladimír
Cílem projektu je identifikace historické sítě prvků ekologické stability krajiny pomocí historických mapových děl. Výsledky projektu budou využity managementem péče o volnou krajinu, v krajinotvorných programech, pro tvorbu rekonstrukčních map krajinné struktury, pro studium krajinných změn v čase a prostoru. Hlavním úkolem projektu bylo pořízení kompletních mapových souborů I. a II. vojenského mapování z území Čech, Moravy a Slezska, tvorba metodiky jejich interpretace za účelem získání informací o historické síti prvků ekologické stability krajiny. Historické mapové podklady byly převedeny do digitálního záznamu. Jako modelová území byly vybrány tyto oblasti: Labské pískovce, Mostecko, Novomlýnské nádrže a Zlatá stoka.
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