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Concentration of magnetic flux at microscale
Střecha, Jan ; Wojewoda, Ondřej (referee) ; Staňo, Michal (advisor)
Magnetic concentrators are used to amplify the detected field by magnetic sensors or as cores in coils to direct the magnetic field. This work focuses on magnetic field concentrators at the microscopic scale and aims to design various metamaterials and geometries that could be used to enhance the magnetic field. The simulations use the program Mumax3, which employs the finite difference method and discretizes space into small cuboids to solve the time dependence of magnetization. Initially, the "petal" geometry was investigated, with a concentrator diameter of 5 m, and the simulated amplification value was determined upon applying an external field. Subsequently, metamaterials made of permalloy NiFe were created from the initial petal shape, consisting of small equilateral triangles with a size of less than 0.5 m, varying the distance between individual elements and their thickness. A petal with a thickness of 15 nm achieves an amplification of 2, while the examined geometries achieved amplifications of less than 1.2 for the same thickness. The results that achieved the highest value, around 1.8, were for thicknesses of 60 nm.
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Approaches to customers and the role of sales staff of selected retail brands of Czechoslovak history and the present
Střecha, Jan ; Halada, Jan (advisor) ; Koudelková, Petra (referee)
My bachelor thesis "Comparison of marketing and the role of sales assistants of retail brands of Czechoslovak history and present" uses two case studies to analyse and then compare the brands Nehera, oděvní služba; Rolný, továrna na oděvy with H&M and company V. J. Rott with IKEA. The first part deals with the theoretical concepts and terms, which are the history of sales itself, customer buying behaviour, retail marketing and fashion marketing. The second part of the thesis presents the history of all the companies studied and the third part of the thesis deals with two case studies, which include analyses of the 4P marketing mixes and selected promotion methods and a subsequent comparison of the analyses performed. The thesis looks for differences and correspondences within the marketing mix, marketing messages and also selected publications. It then concludes with a summary of its findings.
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