Rare earth elements consist of 15 lanthanides, Y and Sc. They are currently very important materials in many industrial branches (metalurgy, pollishing). One of these options is the usage as the compound of phosphors in electronic devices (television and computer displays. Because of their manufacturing cost, options of recovery from waste electrical and electronic equipment (WEEE) are investigated. This thesis deals with compoud elements of phosphors from displays of type CRT (cathode ray tube) and plasma TV. The 37 samples of phosphors from different displays were taken and processed for study of the compoud elements. Phosphors were separated to 4 subgroups in accordance with the corresponding type of displays: black-and-white CRT television displays (CRT_CB), color CRT television displays (TV_B), color PC displays (PC_B) and monochromatic PC displays (PC_M). The study was carry out by multiple features analysis that combined the inductively coupled plasma mass spectrometry (ICP-MS), the inductively coupled plasma optical emission spectrometry (ICP-OES), the resistance furnace with infrared detector (RF-IF) and the atomic absorption spectrometry (AAS). Based on the results of this analysis, main elements and potentionally hazardous elements of phosphors subgroup were defined. Concentration of rare...

Nuclear magnetic resonance is a method, which provides information about the magnitude of hyperfine field present on izotope's nuclei with non-zero spin. The hyperfine field is sensitive to the local ordering of atoms surrounding the nuclei. The hyperfine field changes can be observed in response to changes in surroundings caused by substitution. The NMR spektra of 57Fe nuclei in the hexagonal ferrites with magnetoplumbit structure which contain cation substitution of trivalent cations Nd, Pr in crystallographic position of divalent cations Sr are measured and interpreted in this work. All experiment are measured at 4.2 K and we investigate the influence of the cation substituion on hyperfine field in thr measured oxides.

The ground-state properties of f-electron compounds are characterized by strong interactions which lead to a plethora of exotic states. In this thesis we focused on compounds crystallizing in the tetragonal HonCoGa3n+2-type structure. Several new compounds have been synthesized from In-flux; particularly enigmatic are Ce3TIn11 (T = Pd, Pt). These compounds possess two inequivalent Ce-sites and reveal coexistence of antiferromagnetic order and heavy fermion superconductivity at ambient pressure. This coexistence can be explained in the framework of two-Kondo ion lattice model, assuming one Ce-site being completely Kondo screened with the 4f-electron behaving itinerant and participating in superconductivity while the second Ce-site retains its local character giving rise to magnetic order via the RKKY interaction. The influence of crystal electric field on the magnetic ground state has been investigated on the Kondo compound Ce2RhIn8 by means of neutron experiments. U2RhIn8 and URhIn5 behave like transition-metal antiferromagnets, contrary to Ce(4f)-counterparts. The 5f-states are entirely hybridized and Kondo interactions play no role. Neither does it in the investigated RE2CoIn8 (RE = Pr, Nd, Dy) compounds which exhibit strong localized 4f-electron behavior. Here, the influence of strong...

Title: Ground state investigations of Ce and U intermetallic compounds Author: Attila Bartha Department: Department of Condensed Matter Physics Supervisor: RNDr. Jan Prokleška, Ph.D., Department of Condensed Matter Physics Abstract: Rare earth and actinide intermetallic compounds offer a plethora of interesting physical properties due to the varied behavior of f -electrons together with numerous interactions these electrons are exposed to. In this thesis we address a broad spectrum of ground state investigations on CePd2X3 (X=Zn, Ga) and (Ce,U)nTIn3n+2 (T=Rh, Ir) compounds. Single crystals of CePd2Zn3 and CePd2Ga3 compounds were synthesized for the first time using Bridgman method. CePd2Ga3 revealed a ferromagnetic transition with TC = 6.7 K with a strong magnetocrystalline anisotropy. CePd2Zn3 orders antiferromagnetically below TN = 1.9 K. Results of magnetization measurements on Ce2IrIn8 revealed effective magnetic moment µeff = 2.45µB/Ce3+ and a paramagnetic Curie temperature θP = −31 K. Decomposition of Hall resistivity ρxy(B) into NHE and AHE revealed a predom- inance of AHE in the temperature range from 60 K up to 100 K. Ce2RhIn8 was studied by means of magnetic field and angle dependent magnetization and heat capacity measurements. The resulting phase diagram reveals a complete unfold- ing and...

Fundamental magnetic properties have been studied in RFexAl12-x (R - heavy rare-earth element) compounds with the tetragonal crystal structure of the ThMn12 type. In the homogeneity range 4 ≤ x ≤ 6, exchange interactions and magnetocrystalline anisotropy of the Fe sublattice are significantly modified as found in LuFexAl12-x with non-magnetic Lu. With increasing Fe content, antiferromagnetic exchange interactions weaken and ferromagnetic strengthen. The change of the type of magnetic ordering occurs in the vicinity of x = 5. The Fe sublattice displays an easy-plane magnetic anisotropy that weakens with growing Fe concentration. RFe5Al7 compounds with magnetic R are highly anisotropic ferrimagnets with Curie temperatures from 193 to 262 K. Spontaneous and field-induced magnetic phase transitions of anisotropic and exchange nature have been found in RFe5Al7 by measurements of magnetization and sound propagation. The transitions provide quantitative information on the R-Fe inter-sublattice exchange. A correlation between the R element and the fundamental magnetic properties has been found for RFe5Al7. The Fe magnetic moment is near 8 µB per formula unit. The compounds with R - Tb, Dy, Ho and Er have a compensation of the rare- earth and iron sublattice magnetizations. The compensation point and Curie...

共黨國家雖為一黨專政，但在最高領導層常形成具有二元領導的意涵的集體領導。二元領導體制是有兩位行政領導人的體制；由於二元領導體制符合許多政治狀況的需要，全世界有四分之一以上的國家採取二元領導體制，其中多為半總統制。本文認為東歐後共國家普遍形成半總統制的原因，在於共黨統治時期採取二元領導，以使統治菁英的集體領導得以鞏固。在此二元領導體制下，黨書記通常主管黨務、軍事，總理主管行政、經濟。 本文的重點在於第三章第二、三節的分析。第二節首先從黨內權力制衡的需要分析，指出共黨國家在初期的強人政治或單一領導之後，制度的要求與交易上的精英集體的利益極大化，共同促成一種展現為國家與黨的領導人和行政領導人的分立的二元領導體制。其後從權力繼承制度化與幹部年輕化的重要性進行分析，指出共黨國家二元領導體制要走向成熟，必須破除領導職務終身制。 在第三章第三節，本文引入國際政治學結構現實主義的觀點，強調權力結構的「二元」穩定性，同時分析共黨國家領導層的職務分配可能性，將之區分為單一領導、典型二元領導、非典型二元領導、多元領導等類型，並以蘇聯與中國大陸的政治菁英的職務分配作為範例加以介紹，說明典型二元領導是共黨國家領導體制的趨勢。 在此分析之後，本文在第四章分析蘇聯的領導體制變化，在第五章分析中共的職務分配趨勢。本文結論認為，中共幹部年輕化的制度壓力，使中共現任軍委主席江澤民必須盡快退休，而依據本文對典型二元領導體制的建構與利弊分析，中共政治菁英的共識將是讓胡錦濤接任中央軍委主席職務。倘若中共政局果真如此發展，則中共的典型二元領導將進一步強化。此種趨勢的進一步發展，將使中共民主化後傾向於採取半總統制。

The topic of my master`s thesis is to design foundations of multifunctional building in Olomouc. Another part of this master`s thesis deals with safe and economic design solution of shoring wall. This construction is used to built underground parts of the building. The last part of the work contains description of technological proces of the geotechnics constructions execution. The drawing documentation is also included.

The topic of this master's thesis are the design of ensuring foundation pit and foundation of administrative building in Prague. In the vicinity of foundation pit is situated the river Vltava, which directly influences the ground water level at the job site. During construction, it is necessary to envisage the possibility of occurrence of the old building structures of docks.

The aim is to design economical and above all safe securing a deep notch, both in the construction phase and throughout the use of the building. In the first part of the thesis Background research will be given an idea of the construction of the geotechnical point of view. The second part will contain the geotechnical design calculation. The third part will be proposed safety recommendations in terms of geotechnical monitoring.

The work is divided into two parts. The practical part deals with the testing properties of soils which are using in new road in Nové Město na Moravě and the testing of recycled materials which could replace this soils from road. The aim this part is to obtain values of elastic modulus which are then inserted into the computational model. In the second part of work the track road is modeled in the software which uses the Finite Element Method to calculate and respect physical properties of different materials and a load. The result of work will be studies with comparison of displacement and stress generated to using existing soils and recycled materials.