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High Performance Polymer Composites
Bábík, Adam ; Lapčík,, Lubomír (referee) ; Prokeš, Jan (referee) ; Čech, Vladimír (advisor)
High performance polymer composites are materials with emphasis on specific chemical and mechanical properties due to their broad scope of applications. The main advantages are high strenght and toughness in comparison with their low weight and density. An increased adhesion at composite interfaces is important to ensure excellent composite properties. Bundles of glass fibers were coated by plasma-polymerised interlayers of tetravinylsilane (pp-TVS) of different thicknesses and at different effective powers. The prepared interlayers of pp-TVS were analyzed to evaluate chemical composition (RBS, FTIR, XPS) and mechanical properties (NI-AFM). Microindentation test and fiber-bundle pull-out test were used to determine the interfacial shear strenght.
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Mechanical response of long-fiber-reinforced polymer composite
Škriniarová, Nina ; Prokeš, Jan (referee) ; Čech, Vladimír (advisor)
This diploma thesis is focused on monitoring of mechanical response of long-fiber reinforced polymer composite. Main part of this thesis was preparation of long-fiber reinforced composite specimens, on which matrix was reinforced by commercially sized glass fibers. For comparison of properties were prepared specimens reinforced by unsized glass fibers. Apart from preparing specimens reinforced by long glass fibers were prepared specimens contains long carbon fibers. For evaluation of mechanical response of the prepared composite specimen were used flexural test and short beam shear test. Mechanical response was evaluated with universal testing machine ZWICK Z010 and data were processed in OriginPro 8 program. Thanks to evaluation of the mechanical response of the prepared specimens was assessed adhesion to fiber-matrix interface. By examining the mechanical response or adhesion can be assessed efficiency of commercial fiber surface treatment and so standardize measurement to compare other options of surface treatments.
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Analysis of the current financial state of czech credit unions
Prokeš, Jan ; Pfeifer, Lukáš (advisor) ; Štěpánek, Pavel (referee)
This thesis analyzes the current problems of the credit union sector . At first describes the historical development of unions and further developments in the sector at the turn of the millennium. The greatest emphasis is placed on presenting the main trends in the development of cooperative banking in the Czech Republic from 2005 to the present. Solve the main problems of the sector -- excessive growth of balance sheets unions and their ever increasing risk and the disproportionate effect of the Deposit Insurance Fund -- is responsible for the amendment of the Act No. 87/ 1995 on Credit Unions , which sets the upper limit size increase savings and credit unions share of the contribution to the deposit Insurance Fund and the creation of reserves to fund the venture. The amendment, which is based on the recommendations of the FSAP mission of the International Monetary Fund , is evaluated in the main part of the work . Rating legislative changes is positive , as in the Czech Republic it is necessary to reduce the risk sector unions and unions to regulate the way to the most congruent with the principles of unions by the World Council of Credit Unions ( WOCCU )
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