|
|
Magnetic susceptibility survey within the archaeological prospection
Lázničková, Eva ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
Title: Magnetic susceptibility survey within the archaeological prospection Author: Eva Laznickova Department: Institute of Hydrogeology, Engineering Geology and Applied Geophysics Supervisor: PhDr. RNDr. Jiri Dohnal The work is focused on the use of magnetic susceptibility measurement in archaeological prospection and consists of two interconnected parts. The core of the first one is the background research including basic theoretical and practical knowledge of magnetic susceptibility measurement, with an emphasis on field prospecting and the application of this method in archaeological research. The theme of the second part comprises the areal geophysical survey of the segment of the Hussite siege camp by Novy hrad u Kunratic realized by means of magnetic susceptibility measurement and other selected geophysical methods (magnetometry, conductometry). The contents of this part includes the field measurement, data processing and complex interpretation of the results in connection with all other available information.
|
|
|
Magnetic identification and characterization of Andosols in the Czech Republic
Rainer, Sabina ; Grison, Hana (advisor) ; Borůvka, Luboš (referee)
The aim of the thesis is the identification and characterization of soils with andic properties using the magnetic methods. Investigated soil is located in the Velký Roudný in the Nízký Jeseník mountain. This is the only known area with Andosols on the territory of the Czech Republic. Magnetic measurements will be performed both in the field and in the laboratory, and will be accomplished by geochemical analyses necessary for accurate pedological characterisation. Magnetic data will be interpreted in termagnetická susceptibilita of the geological and environmental conditions. The results will be compared with the properties of the Andosols from the French Massif Central.
|
|
|
Correlation of abiotic proxies in Holocene lacustrine sediments of Peri-Atlantic Arctic
Roman, Matěj ; Nývlt, Daniel (advisor) ; Sedláček, Jan (referee)
The peri-Atlantic Arctic, one of the most sensitive components of the Earth climate system, experienced pronounced climatic fluctuations during the Holocene. Several external forcings were considered responsible for these variations, including decline of insolation on the Northern Hemisphere, changes in distribution of land ice mass, explosive volcanism, or changes in atmospheric and oceanic circulation. In order to explore the driving mechanisms of the peri-Atlantic Arctic environmental variability, three sites located in different parts of the region were selected for palaeoenvironmental reconstructions with focus on extracting the climatic information. With this intention, sedimentary cores from i) Lake Garmaksla, Central Svalbard, ii) Jarfjorden, northeastern Norway, and iii) Kobbefjord area, southwestern Greenland, were retrieved and subjected to multi-proxy investigation. The absolute chronostratigraphic framework was established by comprehensive radiocarbon (14 C) and short-lived radioisotopes (210 Pb, 137 Cs) dating. Further analyses include measurements of magnetic susceptibility, grain size distribution, element composition by means of X-ray fluorescence (XRF), and elements bound to organic matter, i.e. organic carbon, nitrogen, sulphur and biogenic silica. The relationships between the...
|
|
|
Magnetic susceptibility survey within the archaeological prospection
Lázničková, Eva ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
Title: Magnetic susceptibility survey within the archaeological prospection Author: Eva Laznickova Department: Institute of Hydrogeology, Engineering Geology and Applied Geophysics Supervisor: PhDr. RNDr. Jiri Dohnal The work is focused on the use of magnetic susceptibility measurement in archaeological prospection and consists of two interconnected parts. The core of the first one is the background research including basic theoretical and practical knowledge of magnetic susceptibility measurement, with an emphasis on field prospecting and the application of this method in archaeological research. The theme of the second part comprises the areal geophysical survey of the segment of the Hussite siege camp by Novy hrad u Kunratic realized by means of magnetic susceptibility measurement and other selected geophysical methods (magnetometry, conductometry). The contents of this part includes the field measurement, data processing and complex interpretation of the results in connection with all other available information.
|
|
|
Measuring magnetic properties of environmental samples
Zárubová, Alžběta ; Petrovský, Eduard (advisor) ; Kapička, Aleš (referee)
A. Zárubová: Měření magnetických vlastností environmentálních vzorků 1 ENGLISH ABSTRACT This bachelor's thesis presents briefly principles and examples of applications of magnetic measurements in environmental studies. Environmental magnetism is based on determination of iron oxides, their content, concentration and grain size. This information can be interpreted in terms of particle origin, transport or diagenesis. The results can provide information on, e.g., climatic changes in the past, short-term events influencing our environment (e.g., volcanic eruptions) or about contemporary problems associated with human activity (environmental pollution). In the last case, environmental magnetism does not intend to replace geochemical methods, but the main aim is to provide fast and easily available additional information, which helps us to be more effective in mapping contaminated areas, monitoring progression of pollution or modeling transport processes of contaminants. Magnetometry is currently intensively used for mapping contamination of atmosphere, soils and sediments; it can be used in defining long-term levels of contamination, individual pollution sources and their contribution to the overall pollution. This thesis provides a brief overview of the physical basics of environmental magnetism and examples...
|
|
|
Low-field excitations in magnetite
Švindrych, Zdeněk ; Janů, Zdeněk (advisor) ; Novák, Pavel (referee) ; Svoboda, Pavel (referee)
We have performed detailed measurements of magnetic and dielectric properties of high quality magnetite (Fe3O4) single crystals in weak magnetic and electric fields. These measurements can reveal details of phase transitions and other features that are not yet fully understood. We focused not only at the Verwey transition - a well known phase transition taking place at about 120 K in stoichiometric samples - but we also explored and described new relaxation effects in magnetite at low temperatures. The low-temperature properties were also found to be exceptionally sensitive to sample quality, stoichiometry and homogeneity. The results presented in this thesis were acquired on sensitive non-commercial SQUID magnetometer complemented by four-probe dielectric spectroscopy and dc conductivity measurements.
|
|
|
Aplication of magnetic susceptibility in study of soil pollution
Surmová, Petra ; Mihaljevič, Martin (advisor) ; Nováková, Tereza (referee)
The aim of this thesis is briefly summarize the application of magnetic susceptibility in study of soil pollution. The manuscript is based on scientific articles focusing on the above mentioned subject. In each chapter I deal with magnetic properties of rocks and minerals, in particular the magnetic susceptibility. Magnetic susceptibility in a weak magnetic field is one of the most important parameters, which indicates a change in the concentration of ferimagnetics in soils and sediments (Kapička et al., 2004). Main magnetic minerals are described with respect to their occurrence in soils and anthropogenic origin. Both field and laboratory instruments for the measurement of magnetic susceptibility are also described. In the final chapter I deal with two case studies, where magnetic susceptibility measurements were used in environmental study. I compare two different geographical areas in terms of pollution, relatively clean Krkonoše Mountains National Park and industrially polluted Upper Silesia. Keywords: antropogenic ferimagnetics, magnetic susceptibility, magnetic minerals
|
|
|
Change of magnetic susceptibility during the germination of plants
Sedlář, Petr ; Fiala, Pavel (referee) ; Vlachová Hutová, Eliška (advisor)
The work examines the changes in the magnetic susceptibility during the early germination of the somatic embryo (RSE) of the Norway spruce. Susceptibility is in the physically view the property, which can be used to determine a variety of parameters and properties of the measured objects. The aim of this work was to create a automatic to evaluate the susceptibility of the tissue RSE and take measurements to prove or disprove the contrary of the accuracy of this assessment. This work contains the results obtained by modeling a script in Matlab, in which can be shown the correctness of the theoretical concepts.
|
|
|
Metal detector for industrial use
Stehno, Rostislav ; Friedl, Martin (referee) ; Szabó, Zoltán (advisor)
The goal of this project is explore and study the ways of metal detecting and create a metal detector for industrial use. During a project development, the device size and user easy interface were the basic requirement. As a visual device was chosen LCD touch display, which is very important as a user-friendly interface. For math calculations and right function of device will be implemented microcontroller from Atmel corporation. As a data storage will be used a flash memory with 16MB of size. When the device were inventing, a lot of methods were studied and the impulse detect method were chosen which is the most perspective way of metal detecting. Device will communicate with PC trough a USB port. The device will have a battery which allows device to run for a few hours. The prototype of PCB were developed. Few mistakes has been discovered, while the device were constructed, but they were solved successfully.
|
|
|
Metal detector for industrial use
Stehno, Rostislav ; Hrabina, Jan (referee) ; Szabó, Zoltán (advisor)
The goal of this project is explore and study the ways of metal detecting and create a metal detector for industrial use. When the device were inventing, a lot of methods were studied and the impulse detect method were chosen as the most perspective way of metal detecting, thanks to a huge electronics parts possibilities. After experiences with preceding device was necessary to redesign it. Main target of this thesis is to increase the computing power of detector. For this purpose will device need a new microcontroller. Device will communicate with PC trough a USB port. The device will have a battery which allows device to run for a few hours. Processing of measured data will be make even with DFT which will lead to better analyze of mass and type of conductor under device.
|
guest ::
