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Fracture behaviour of heat affected zone near heterogeneous weld joint
Jelínek, Vladimír ; Válka, Libor (referee) ; Juliš, Martin (advisor)
The study deals with mechanical characteristic of heterogeneous weld joint. The low carbon steel 22K and austenitic steel have been used as a experimetnal materials. The low carbon steel has special properties in basic condition. The sample has been evaluated in basic condition and after annealation. There have been evaluated impact of annealation proces to structure and mechanical charakteristics in experimental part of study. The particularised analysis of microstructure has been done by pictorial analysis. Mechanical characteristics has been examinated in both conditions by 2 different methods – measurment of microhardness according to Vickers and test of fracture toughness on compact tension specimens.
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Communication Mix on the Social Networks
Lunda, Radek ; Jelínek, Vojtěch (referee) ; Kaňovská, Lucie (advisor)
This diploma thesis deals with a suitable proposal for a combination of promotional tools on social network sites Facebook and Instagram. In particular, the Reach, Views, and Followers variables will be tracked. In the theoretical part, the basic knowledge of the online marketing environment, knowledge of history and the advantages and disadvantages of classical and online marketing will be defined. In the upcoming analytical part from the described area, will be described potential opportunities for the development of social networking sites, which the author of this work uses to promote cultural events in Brno. The author of this work describes the competitive sites and profiles in the field of promotion of cultural events in Brno. In order to fulfill the stated goals of this work, a combination of paid or unpaid tools and their alternatives on the social networking sites Instagram and Facebook will be formulated.
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Construction and production of the floorball stick blade using Fused Deposition Modeling
Jelínek, Vít ; Dvořáček, Jan (referee) ; Sedlák, Josef (advisor)
This work combines 3D printing technology (Rapid Prototyping) with the sports industry. Using mentioned modern technology was made functional model blade floorball stick, which originated in the engineering design 3D parametric software Autodesk Inventor. Work will explain the history of floorball and individual methods increasingly popular and more affordable 3D printing, through which could be modeled blade floorball stick. Conclusion contains techno-economic evaluation, where will be disclosed the pros and cons of the use of Rapid Prototyping technology in this sports industry.
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Production control system to solve safety risks
Jelínek, Vojtěch ; Zezulka, František (referee) ; Pásek, Jan (advisor)
This bachelor´s thesis deals with a description of automated manufacturing process with solution of safety risks in the industrial company SWOBODA.CZ. In the first part are placed an information about operating procedure of manufacturing process, conceptions of the control and safety and information about the specific hardware and software. Next part contains program which deals with safety of machine and description of visualization and control of machine. In the end is described program for testing error statuses of machine and their announcements.
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New trends and material usage in bicycle frame design
Jelínek, Vladimír ; Němec, Karel (referee) ; Juliš, Martin (advisor)
Thesis in its first part summarizes the evolution of the bicycle from the draisine to the low wheels with a focus on the material of the frame of the bicycle. Also discussed in this section is an overview of small structural modifications, which were gradually used on a bike, like Bowden brake or the first type of transmission system. In the second part, the thesis describes the operating principles and types of suspension forks and disc brakes. Mentioned are materials that are currently used for bike frames with a focus on the advantages and disadvantages of each material used and its future anticipated use.
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Analysis of Sports Complex by Selective Methods
Jelínek, Vojtěch ; Ovesný, Tomáš (referee) ; Hanušová, Helena (advisor)
This bachelor´s thesis deals with analysis of the sports complex U Hrocha, which will be completed in 2014. It contains theoretical bases, which are then implemented in the actual business reality through PESTLE analysis, Porter's analysis and SWOT analysis. Finally, the situation is evaluated and solutions are proposed to improve the current situation of the company.
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Standard Glass Scales Calibration
Jelínek, Vít ; Fiala, Alois (referee) ; Jankových, Róbert (advisor)
This thesis deals with a more work-efficient and time-efficient method of calibration of standard glass scales, with practical use in the Czech Metrology Institute Regional Inspectorate in Brno. The desired streamlining of calibration were achieved in the use of a 3D coordinate measuring machine Micro-Vu Excel 4520. In the service software InSpec, six measuring programs were designed in the use of a standard glass scale brand SIP. The measurement uncertainties of this calibration were presented and calculated. This thesis draws up a draft proposal of the calibration procedure and drafts a formalized document of the calibration.
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Möbius function of matrix posets
Medek, Michal ; Jelínek, Vít (advisor) ; Kantor, Ida (referee)
In this work, we focus on the M¨obius function µ(X, Y ) of four variants of containment posets of sparse matrices, for which the M¨obius function has not been studied before. A sparse matrix is a binary matrix containing at most one 1-cell in each row and column. We focus mainly on the dominated scattered containment, where X ≤ Y if X can be created from Y by removing some rows and columns and by changing some 1-cells to 0-cells. We consider this poset to be a generalization of the permutation poset, as for permutations σ and π, if σ ≤ π, then the permutation matrices Mσ and Mπ satisfy Mσ ≤ Mπ. For the dominated scattered containment, we study the values of the M¨obius function on intervals of the form [1, Y ], where 1 is the 1 × 1 matrix consisting of a single 1-cell. We show that the situation when Y contains a zero row or column can be reduced to a situation when Y has no such zero line, that is, Y is a permutation matrix. For a permutation matrix Y , we derived a theorem expressing µ(1, Y ) in terms of the blocks of the sum decomposition of Y .
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On the structure and values of betweenness centrality in dense betweenness-uniform graphs
Ghanbari, B. ; Hartman, David ; Jelínek, V. ; Pokorná, Aneta ; Šámal, R. ; Valtr, P.
Betweenness centrality is a network centrality measure based on the amount of shortest paths passing through a given vertex. A graph is betweenness-uniform (BUG)if all vertices have an equal value of betweenness centrality. In this contribution, we focus on betweenness-uniform graphs with betweenness centrality below one. We disprove a conjecture about the existence of a BUG with betweenness value α for any rational numberαfrom the interval (3/4,∞) by showing that only very few betweenness centrality values below 6/7 are attained for at least one BUG. Furthermore, among graphs with diameter at least three, there are no betweenness-uniform graphs with a betweenness centrality smaller than one. In graphs of smaller diameter, the same can be shown under a uniformity condition on the components of the complement.
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Intraspecific and intraclutch variability of avian egg
Králová, Barbora ; Jelínek, Václav (advisor) ; Sedláček, Ondřej (referee)
Egg-laying birds have a huge variation between species in terms of number, size, pigmentation, but also in the speckled nature of the eggs. Bird eggs vary not only between species, but also within species, even within a clutch. It is only recently that more speculation has begun about the possible causes of intraspecific variation. Hypotheses about intraclutch variation started to emerge even later. This thesis presents and describes some of the hypotheses dealing with egg variability. One of the most significant factors affecting intraspecific variability is food availability, which in turn affects female fitness. For intraclutch variability, most studies focus on the difference between the last egg and other eggs within the clutch. In many cases, the last egg has a size difference, but also a different amount of pigment compared to the other eggs in the clutch, which are not significantly different from each other.
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