National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Production process optimization
Drábková, Veronika ; Jankových, Róbert (referee) ; Fiala, Alois (advisor)
This master´s thesis is aimed at the strategy and implementation of DOE (planned experiment) and QFD (quality function deployment) in business. There are described about these methods. It deals with their use for a given problem. The last section provides a possible procedure in the enterprise.
Influence of concentration of selected pearlitic elements on structure and properties of spheroidal graphite cast iron
Kazdera, Vojtěch ; Kaňa, Václav (referee) ; Záděra, Antonín (advisor)
This masters thesis deals with the influence of selected pearlitic elements on the mechanical properties and structure of spheroidal graphite cast iron. The theoretical part analyses the parameters that have a major impact on the mechanical properties and structure of cast irons. In the practical part, the influence of Cu, Mn and thickness on the mechanical properties and structure of spheroidal graphite cast iron is determined by means of a planned experiment. The measured values were then statistically processed and the result is equations for the theoretical calculation of mechanical properties.
Optimization of poly(3-hydroxybutyrate) based biocomposite with respect to its printability and mechanical properties
Chaloupková, Kateřina ; Obruča, Stanislav (referee) ; Přikryl, Radek (advisor)
The presented theses deals with preparation and optimalization of biocompatible material based on poly(3-hydroxybutyrate). Other components of prepared samples are polylactid acid, hydroxyapatite and commercially available plasticizer Syncroflex3114. These components were chosen based on their biocompatibility and properties that can be possibly used in tissue engineering. Theoretical part of this theses contains general overview of bone tissue and review of materials used in bone tissue regeneration. Part of this thesis also deals with the problematics of scaffolds. Aim of the experimental part is a planned experiment, which is used to optimize the mixture with respect to printability and mechanical properties. The first step is the preparation of samples based on the proposed conditions and their subsequent processing into a filament with an exact diameter of 1,75 mm for 3D printing using the fused deposition modeling method. From the prepared filaments, test specimens were printed for the following experiments: temperature tower, warping coefficient measurement, bending and pressure test. Data from these experiments were processed using a mathematical model in the form of graphs and equations which show the effect of material components on the measured quantity. It was found that the amount of plasticizer in the sample affects the properties the most. This effect is negative in all cases and worsens the properties of the material. The result of the planned experiment is also a mixture optimized for the best possible printability and mechanical properties (bending modulus 3,3 GPa and pressure modulus 2,3 GPa). With regard to the potential application of the material in bone tissue engineering, the first accelerated biodegradation screening tests were performed for selected samples. The results of accelerated degradation tests are ambiguous and further optimization is needed. Simultaneously with the diploma thesis, biological testing of scaffolds printed on a 3D printer from prepared samples took place. All tested samples were found to be biocompatible.
Influence of concentration of selected pearlitic elements on structure and properties of spheroidal graphite cast iron
Kazdera, Vojtěch ; Kaňa, Václav (referee) ; Záděra, Antonín (advisor)
This masters thesis deals with the influence of selected pearlitic elements on the mechanical properties and structure of spheroidal graphite cast iron. The theoretical part analyses the parameters that have a major impact on the mechanical properties and structure of cast irons. In the practical part, the influence of Cu, Mn and thickness on the mechanical properties and structure of spheroidal graphite cast iron is determined by means of a planned experiment. The measured values were then statistically processed and the result is equations for the theoretical calculation of mechanical properties.
Optimization of poly(3-hydroxybutyrate) based biocomposite with respect to its printability and mechanical properties
Chaloupková, Kateřina ; Obruča, Stanislav (referee) ; Přikryl, Radek (advisor)
The presented theses deals with preparation and optimalization of biocompatible material based on poly(3-hydroxybutyrate). Other components of prepared samples are polylactid acid, hydroxyapatite and commercially available plasticizer Syncroflex3114. These components were chosen based on their biocompatibility and properties that can be possibly used in tissue engineering. Theoretical part of this theses contains general overview of bone tissue and review of materials used in bone tissue regeneration. Part of this thesis also deals with the problematics of scaffolds. Aim of the experimental part is a planned experiment, which is used to optimize the mixture with respect to printability and mechanical properties. The first step is the preparation of samples based on the proposed conditions and their subsequent processing into a filament with an exact diameter of 1,75 mm for 3D printing using the fused deposition modeling method. From the prepared filaments, test specimens were printed for the following experiments: temperature tower, warping coefficient measurement, bending and pressure test. Data from these experiments were processed using a mathematical model in the form of graphs and equations which show the effect of material components on the measured quantity. It was found that the amount of plasticizer in the sample affects the properties the most. This effect is negative in all cases and worsens the properties of the material. The result of the planned experiment is also a mixture optimized for the best possible printability and mechanical properties (bending modulus 3,3 GPa and pressure modulus 2,3 GPa). With regard to the potential application of the material in bone tissue engineering, the first accelerated biodegradation screening tests were performed for selected samples. The results of accelerated degradation tests are ambiguous and further optimization is needed. Simultaneously with the diploma thesis, biological testing of scaffolds printed on a 3D printer from prepared samples took place. All tested samples were found to be biocompatible.
Production process optimization
Drábková, Veronika ; Jankových, Róbert (referee) ; Fiala, Alois (advisor)
This master´s thesis is aimed at the strategy and implementation of DOE (planned experiment) and QFD (quality function deployment) in business. There are described about these methods. It deals with their use for a given problem. The last section provides a possible procedure in the enterprise.

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