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Fast continuous in-situ XCT of additively manufactured carbon fiber reinforced tensile test specimens
Glinz, J. ; Maurer, J. ; Holzleitner, M. ; Pace, F. ; Stamopoulos, A. ; Vopálenský, Michal ; Kumpová, Ivana ; Eckl, M. ; Kastner, J. ; Senck, S.
The reinforcement of fused filament fabricated (FFF) components with continuous fibers allows for high versatility in the design of mechanical properties for a specific application’s needs. However, the bonding quality between continuous fibers and the FFF matrix material has high impact on the overall performance of the composite. In a recent study [1], additively manufactured (AM) continuous fiber reinforced tensile test specimens have been investigated regarding the effect of amount and material of the embedded continuous fibers on tensile strength and AM build quality. During these tensile tests, a sudden reduction in tensile stress, which most likely was not related to actual rupture of continuous fibers, was noticeable. Since X-ray computed tomography (XCT) scans were performed only prior to and after the tensile testing, a detailed investigation on the origin of these drops in tensile stress was not possible. Within this work, we will expand upon these findings and present results of fast on-the-fly in-situ investigations performed on continuous carbon fiber reinforced specimens of the same AM build. During these investigations, specimens are loaded under the same conditions while fast XCT scans, with a total scan time of 12 seconds each, were performed consecutively. The resulting three-dimensional image data reveals internal meso- and macro-structural changes over time/strain to find the cause of the aforementioned reduction in tensile stress.
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Návrh rámce pro monitoring sociálních médií a klíčových ukazatelů výkonnosti pro společnost působící na trhu vlasové kosmetiky
Maurer, Julia Elisabeth ; Král, Petr (advisor) ; Roscher, Katharina (referee)
This work reviews the current literature and application methods of strategic KPI frameworks, KPI definition and measurement, target setting and benchmarking for social networks based on journals, books and whitepapers while including an interview with a social media agency. In a second step, the acquired knowledge is applied on a case study for a salon haircare company. The conclusions are based on in-company experts in the field, external social media agencies and an internal survey. Based on a behavioral survey, the requirements and gaps in the organization are identified. This leads to the application of a theoretical framework on the case company and a suitable definition of KPIs. The final delivery includes an analytical tool measuring all KPIs. Finally, all KPIs are related to targets and benchmarks from industry, social network sites, competitors and historical data. The final results are easily transferrable to other players in the industry.
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Effect of storage conditions on qualitative indicators of game meat
MAURER, Jan
This work deals with the health and meat hygiene of venison and especially its appropriate storage. The aim is to find relationships between cooling and freezing game to bring a deeper insight into the work of meat from wildlife animals to achieve superior quality and taste characteristics unchanged pheasant meat. The basis of the whole work is a laboratory analysis of forty meat samples, which were obtained from local organizations involved in the management of game. In this analysis we are monitored four basic parameters: the content of water, fat, protein, and the connective tissue protein, which are major predictive value for a particular game palatability. It was found that exist statistically significant dependence between proteins and connective tissue protein, protein and water, fat and water. It was not possible to reject the null hypothesis about the differences between refrigerated and frozen samples of water, fat, protein and collagen. Conclusions measurements were compared with the available international and professional Czech literature.
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The trading in butterflies protected by CITES
MAURER, Jan
This thesis deals with international trade in species of butterfly covered by CITES convention. The trade has been done for 1978 2012, CITES Trade Database was used as a basic source. Import and export data has been assessed separately. Numbers of traded specimens have been evaluated for both of these two categories. Main countries of import and export, main terms, source and purpose of trade were also identified. Subsequently, trends have been statisticaly analysed that is it diference in different trade over the years. It was found, that the trend between 1978 -2012 was increasing.
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