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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.
1

Využití pedologických metod v archeologii

Hladký, Jan January 2012 (has links)
Soil studies can reveal how humans in prehistory used the landscape and defined space through their activities. However, these new approaches do not wholly address persistent problems associated with making inferences about past human activity from soils. These challenges include:equifinality; distinguishing property--process relationships; identifying anthropogenic soil processes; the interdependency of the soil forming factors. This paper reviews a new approach to an archaeological research. This approach includes chemical and physical analyses of soil samples. With help of these analyses we can evaluate a past land use, a past natural processes and we can found a buried cultural layer. This approach can be used as a guide to ensure that a rigorous and reproducible approach is taken to the study of soils at archaeological sites. In tis study, the impact of human activity on the pedological environment of soils of the archaeological site Mikulčice-Valy was investigated and use of soils for archaeological use is discussed. Soil samples were collected from five probes (VII. kostel) and from three probes (knížecí palác). These soil properties were investigated: pH, amount of P, Mg, K, Fe and Ca, loss-on-ignition, conduction, texture analysis and physical analysis of sampel.
2

Nástroj pro vrtání stavebních materiálů / A Cutting Tool for Drilling of Constructional Materials

Stavinoha, Petr January 2009 (has links)
This thesis deals with the analysis of drilling technology of building materials and design of drilling tools. The thesis analyzes a given cutting materials and usability their applications for drilling of building materials. Further, the thesis deals with the creation of 3D model of drilling tool in SolidWorks environment and preparation of CNC program for cutting centre SP 208 SY which is controlled by Sinumerik system.
3

Korelace parametrů vybraných typů hornin na základě laboratorních zkoušek / Correlations of parameters of selected rock types based on laboratory tests

Závacký, Martin Unknown Date (has links)
The dissertation thesis deals with the properties of hard rocks important for designing geotechnical structures, such as strength and deformation characteristics, as well as rock failure criteria. This work examines the possibility of using correlation relations to estimate the strength characteristics of rocks from index tests, which can make the rock testing process more efficient. The author described selected laboratory tests of rocks and identified several limitations of the tests procedures based on his own practical experience. The correlation analysis of an extensive data set and the derivation of regression relations for selected dependencies were performed. Furthermore, the rock strength estimation quality of the newly derived regressions was compared with the already published regressions. The analysis shows that the achieved degree of correlation is not sufficient to generalize the examined regressions. A significant reason of the low degree of correlation is the combination of the variability of rock properties and limitations of practical testing procedures. Thus, focus should be paid on calibration of the regression relationships within smaller areas in order to precisely estimate the rock properties as reliable input to the geotechnical design.
4

Podmínky a mechanismus vmístění saského granulitového masivu v saxothuringiku / Conditions and mechanism of emplacement of the Saxon Granulite Massif in Saxothuringian

Ramešová, Olga January 2015 (has links)
The Saxonian Granulite Massif in the Saxothuringian Domain of the Bohemian Massif, is represented by a single granulite body consisting of felsic and mafic granulites formed during Variscan tectono-metamorphic event. The granulites with peak metamorphic P-T conditions of ~2.3 GPa and 970-1060 řC (Fuhrman and Lindsley, 1988; Rötzler and Romer, 2001) were exhumed and emplaced into the palaeozic sedimentary cover sequence, which resulted into contact metamorphism affecting these metasedimentary rocks and development of a contact metamorphic aureole. In the map view, the granulite body has elongated shape with the long axis oriented in NE- SW direction and it is surrounded by the so called schist mantle reflecting the extent of the contact metamorphic aureole. Within two kilometers distance away from the contact with granulite body, the metamorphic grade in metasediments decreases from cordierite gneiss, andalusite bearing micaschist to phyllite. Detailed field structural analysis in the studied area revealed a deformation record associated with four main deformation phases. In granulites the oldest deformation fabric contains kyanite and sillimanite. This fabric is locally overprinted by the subhorizontal green schist facies fabric, mainly along the margins of the granulite body. In metasediments, the...
5

Testování vybraných metod ke zpřesnění stratigrafie králodvorského souvrství / Tests of selected methods leading to precise stratigraphy of the Králův Dvůr Formation

Bartošová, Jarmila January 2010 (has links)
A model study about the precise stratigraphy of the Kralodvorian Formation was made on the drill core from Ořech near Prague. The exposure at Levín was used as a reference section. Both sections were sedimentologicaly studied and described in detail. The study of thin sections was a supplemented for exact description of the rocks and lithotypes. Chemostratigraphic methods (?13C and TOC) and method of the rock magnetic susceptibility were used for detailed stratigraphic analyse. All the mentioned methods of both sections. Samples for the measurements of the magnetic susceptibility were taken by 0.5 m of thickness. The measurement of ?13C and TOC was taken from the non-wheathered 80 m of the drill core Ořech and from the upper 20 m Králův Dvůr Formation at Levín profile by 2 m. The available data show that Ořech represents low and middle part of the Kralodvorian strata and that all studied thickness (80 m) belongs to only positive excursion of ?13C. This excursion is interpreted to be the upper Katian. It gives an evidence that sedimentation of the Kralův Dvůr Formation was very fast. Identification and interpretation of this excursion makes possible the accurate interregional corelation of the strata. A precise regional stratigraphic subdivision is based on inhomogenities caused by different materials or...
6

Mechanizmy frakturace a vzniku žil na ložisku Mokrsko / Mechanisms of fracturing and origin of veins on Mokrsko deposit

Švagera, Ondřej January 2014 (has links)
Locality Mokrsko-west is located inside the Josef mining gallery and belongs to the ore district Psí Hory Mountains, known for its high content of micro-granular gold (~ 100 g/t). It is situated within the apophysis of Sázava tonalite, which is a part of Central Bohemian Plutonic Complex, located southerly from Prague. Besides other structural elements, the whole locality contains the network of sheeted quartz veinlets, which is the aim of this thesis. Data from vectorization and image analysis of the photographic documentation from the gallery and electron microscope has been used. The statistical approach has been used to quantify proportions of mineral phases within the quartz veinlets, their cumulative spacing and fractal distribution. Image analysis confirmed the presence of K-feldspathic metasomatism which affects the plagioclase grains. It forms rims on the edges of the quartz veinlets. The proportional relationship of K-feldspar and quartz within the veinlets wasn't confirmed. It's therefore possible that they were two separate processes of the uncertain time relation. Transfer from the lognormal distribution in histograms of vein spacing in drill-cores to the more normal distribution of the veinlets in the gallery walls was observed. Results from the cumulative spacing analysis confirmed...
7

Změny vnitřní stavby klastických sedimentárních hornin při zkoušce Schmidtovým kladivem / Modification of rock fabric of clastic sedimentary rocks due to the Schmidt hammer test

Snížek, Petr January 2013 (has links)
iv Summary Schmidt hammer is the instrument which is used for the assessment of rock mechanical properties and this instrument is classified as the indirect method. This method is based on the assessment of rebound value (R) of the Schmidt hammer, which is measurred by the amount of rebound of the impact plunger from the surface of tested rock. Schmidt hammer is called as the non-destructive method of rock assessment and it is called as in situ testing method as well. The main objective of this work is provement, that Schmidt hammer testing is destructive method and define degree of damage which is caused in the rock mass. Sedimentary rocks were used for the testing, mostly sandstones and arkose sandstones with different types of cement. This made it possible to test the fraction of the rock mass and the relation between fraction and type of cement. The clasts of the rocks had different properties than it was possible to find the relation between grain size and fraction of the rock. Already in procedure of the testing by Schmidt hammer it was obvious, that this metod is definitely destructive. Rock surface after hitting by plunger of Schmidt hammer gains macroscopically observeable destruction. On the surface is the circular track of the plunger and the surface is grinded. It is possible to wipe the small...
8

Návrh na zřízení venkovní geologické expozice hornin u obce Kozolupy / Proposal of establishment of an outdoor geological expositions near the village Kozolupy

PROCHÁZKOVÁ, Šárka January 2012 (has links)
Diploma work, the proposal of establishment of an outdoor geological expositions near the village Kozolupy deals with characteristics of the place where the exhibition has to be established, natural conditions, geological history of the place and other tourist destinations of the area. Further work characterizes geoparks and issues associated with them and indicates the difference between geoparks and geological exposition, there is also provided a particular example. In next part of the work there are rocks selected for the exhibition, their description and geological characteristics of the area where it came from. This theoretical part follows the practical one. Here is described everything needful concerning the location of geological exposition in the attachment there are exhibition plans and photographs of the park, where exposition is to be located. There are also particular proposals of information boards. Last but not least, work is drawing up the budget. Diploma work concludes proposal of excursions to interesting locations with the visit of the exposition. This Master thesis was created as a part project GA JU 065/2010/S.
9

Studium fyzikálně-mechanických vlastností krystalinických hornin ve vztahu k plánovanému hlubinnému úložišti radioaktivních odpadů / Physico-mechanical properties of crystalline rocks associated with planned deep geological repository for a radioactive waste

Havlíčková, Dagmar Unknown Date (has links)
The Czech deep repository development programme resulted in identification of several localities with favourable geological conditions. The Czech concept of a deep repository construction targets on crystalline host rocks. The dissertation focuses on combined petrographic and physico-mechanical properties (rebound hardness, uniaxial and triaxial compressive strength, indirect tensile strength) of crystalline rocks (durbachite, ganulite) from the most favoured localities – Horka near Velké Meziříčí and Kraví hora near Dolní Rožínka.
10

Zpracování komplexního karotážního měření / Data processing of well log complex

Hanák, David January 2018 (has links)
This thesis is focused on the problem of the determination of shear surfaces of slope instabilities (including fossil ones) from the results of the complex of logging methods. It describes the steps taken during data measurement, processing, and interpretation. All the data comes from the measurements conducted in the boreholes carried out for the geotechnical survey of the sliding area in the immediate proximity of the D8 highway or measurements in a well from the Děčín-Loubí locality. On the second mentioned locality, due to a different well construction, a more extensive logging complex could be carried out. After locating shear surfaces in a slope instability, a comparsion was made to determine whether the results in neighboring boreholes corresponded to each other, and to evaluate which methods (or combination of methods) suits best for the task.

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