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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.
41

Modifikace tenkých vrstev fokusovaným iontovým svazkem. / Thin films modification by focussed ion beam.

Faltýnek, Petr Unknown Date (has links)
The purpouse of the master's thesis is study problematic of focused ion beams and their material influence. In this thesis are described interactions in the sample after impact of ion beam, use and applications of FIB systems. Second part of thesis are simulations of ion influence on different kinds of materials by the help of SRIM program.
42

Analýza a optimalizace efektivnosti zemědělsko-dřevozpracujícího podniku (reálná situace) / Analyses and optimization of efficiency in agriculture and wood-working company

Jágerová, Tereza January 2008 (has links)
This thesis aspires to optimize the processes in agriculture and wood-working company and to propose some changes if needed. At first, it is wood-working branch which is analyzed. The intent is to find an optimal route to distribute pallets and afterwards freight the vehicle by sawn wood and return back with. This is some modification of travelling salesman problem with more than one salesman and more centers including the condition that the travelling is dynamic in time and that only selected clients are visited. The agriculture problem is more complicated and complex because the model aims to find an optimal portfolio of diverse animal and vegetal production influenced by many factors and some of them are mentioned below. The agriculture model includes for example the stochastic character of weather and the condition that the herd of cattle should be stable.
43

Modifikácia produktu a jeho vplyv na finančné ukazovatele. / The modification of the product and its impact on financial indicators

Šikyňová, Katarína January 2015 (has links)
The main purpose of diploma thesis named The modification of the product and its impact on financial indicators is to design products respectively. services worthy modifications to recalculate the costs and returns of this modification, and consequently its total return for recreational and gastronomic company operating in tourism. The theoretical part of this thesis contains definition of fundamental termsand market research through questionnaire survey, which aims to characterize the structure of the company and obtains from its customers their designs products. Afterwards the results of survey will be interpreted. At the end of the thesis, in cooperation with the management of the company, the effects of modifications on financial indicators will be analyzed to define if the modification is the desired effect .Analyze the effects of modifications is the main objectives of this thesis.
44

Reaktivní extruze polymerů s využitím peroxidů / Reactive extrusion of polymers by peroxides

Červený, Ladislav January 2021 (has links)
Diploma thesis deals with processing of two types of PP, HDPE, LDPE, PET, PA, PS, PMMA and ABS by reactive extrusion in presence of peroxides. The theoretical part summarizes existing knowledge about processing of used polymers. Reactive extrusion was carried out with a single screw extruder at 260 °C, 30 rpm and 60 rpm depending on peroxide used. One type of PP was processed in presence of Luperox 101, hydrogen peroxide, dicumyl peroxide and potassium persulfate. Luperox 101 and hydrogen peroxide were chosen for reactive extrusion of other polymers. The efficiency of selected peroxides on radical modifications of individual polymers during processing was evaluated by methods of rheological (MFI), structural (FTIR) and thermal (DSC) analysis.
45

Modifikace letounu EV-55 v kategorii CS/FAR 23, Commuter / Modification of EV-55 aircraft in the category CS/FAR 23 Commuter

Gabrlík, Jan January 2011 (has links)
This thesis deal with extended EV-55 version concept according to CS/FAR- 23 Commuter category specifications. Thesis objectives are design weights determination, mass analysis, calculation of aeroplane performances and comparison of aeroplane performances with current aeroplane.
46

Optimalizace metalurgických postupů ve slévárně hliníkových slitin / Optimization of metallurgical processes in aluminum alloys foundry

Halaška, Jan January 2018 (has links)
Diploma thesis examines the influence of the preparation and metallurgical treatment on the mechanical properties and structure of aluminium alloys Al-Si. The experimental part was carried out at MSR Engines s.r.o. This part describes the current (sodium modification) and newly proposed (strontium modification) state of preparation and metallurgical processing of melt. There is state the course of experimental melting processes, testing of samples, evaluation of tests and observation of the impact of individual modifiers on the structure.
47

Klasifikace rootkitů a jimi používaných technik / Rootkits Classification

Plocek, Radovan January 2014 (has links)
This paper describes information about current most widespread methods, which are used by rootkits. It contains basic information connected with development of rootkits, such as process registers, memory protection and native API of Windows operation system. The primary objective of this paper is to provide overview of techniques, such as hooking, code patching and direct kernel object modification, which are used by rootkits and present methods to detect them. These methods will be then implemented by detection and removal tools of rootkits based on these techniques.
48

Modifikace výrobního toku materiálu strojních šicích jehel / Modification of material production flow of the sewing machine needles

Změlík, Josef January 2021 (has links)
Main focus of this diploma thesis is the analysis and subsequent modification of production flow at a company, which is one of the world’s leading providers of industrial needles, precision parts and fine tools. Practical part of this thesis is devoted to the current flow of values and consequently describes its individual modifications. In this part the production areas are mapped, and the material handling system is described. This part also suggests a possible layout modification at the production site and simulation of proposed changes in Plant Simulation software from Siemens PLM Software. At the end of the work there are changes described that relate mainly to the philosophy 5S, kanban system or ergonomics of the workplace.
49

Vývoj maziva pro temeno kolejnice / Top of rail lubricant development

Skurka, Šimon January 2021 (has links)
Friction modification within the wheel-rail interface is an important way of achieving ecologically friendly transportation of both persons and goods. This thesis aims to develop a new TOR lubricant, which will be able to maintain suitable frictional conditions while securing minimal adhesion required for traction. All measurements were carried out on tribometer MTM in the ball-on-disc configuration. In the first step, individual components were examined. More complex compositions were measured after that and the three best of them were compared with commercial TOR lubricants. The results show a good ability of developed compositions to maintain required adhesion, reduce wear, and all of them had resistivity against over-lubrication. Lastly, the process of lubricant verification before its application in real traffic was discussed.
50

Vztah pevnosti a charakteru povrchové úpravy keramických materiálů leptáním a žíháním / Relation strength to nature of surface improvement of ceramic materials by etching and annealing

Vladyka, Petr January 2008 (has links)
The goal of diploma thesis is study of the effect of thermal annealing at different temperatures and different annealing durations on the surface structure of oxide ceramics based on Al2O3 and study of the samples porosity.

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