Ostwestfalen-Lippe University of Applied Sciences and Arts
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Bedingungsgefüge beruflicher Bildung in OWL : Was benötigt exzellente berufliche Bildung?
No full textGyroscopic effects in the structural dynamics of monorail vehicles
No full textNumerous single-track railway lines are currently disused due to economic factors. These lines could potentially be reactivated by small vehicles that utilise only a single rail, enabling bidirectional operation simultaneously. The MONOCAB is such a compact monorail vehicle, stabilised by a system of control moment gyroscopes (CMGs) and a laterally movable, controllable trim mass. Despite their potential, there is currently a lack of comparative references for MONOCABs in relation to other vehicles. In the context of mechanical design and construction, interdependencies with roll stabilisation occur. Of particular concern are torsional effects, which can significantly impact stability. This study investigates the structural dynamics of monorail vehicles with a focus on the influence of gyroscopes. Gyroscopic systems play a significant role in the behaviour of such vehicles, affecting stability, control and response to external disturbances. Through a comprehensive approach encompassing analytical modelling, numerical simulations, and experimental validation, the interactions between the vehicle's structure and gyroscopic components are explored. The analytical considerations are validated via experimentally derived frequency responses utilising a full-scale monorail vehicle. The results of this study have implications for various fields, such as transportation, robotics and aerospace engineering
Soil texture-driven modulation of poly-3-hydroxybutyrate (P3HB) biodegradation: Microbial shifts, and trade-offs between nutrient availability and lettuce growth
No full textPoly-3-hydroxybutyrate (P3HB) is a promising alternative to persistent conventional plastics, capable of biodegrading within months. However, its microbial-driven degradation raises concerns about nutrient immobilization and impacts on plant growth. The biodegradation process occurs in multiple stages, during which shifts in the microbial community can alter soil properties and influence utilization of both intrinsic and polymer-derived organic matter. This study employs a novel approach to investigate how nutrient dynamics during the late stage of P3HB biodegradation affect lettuce (Lactuca sativa var. capitata cv. Brilliant) growth. Soil-to-sand mixtures (100_0, 80_20, 60_40, 40_60, 20_80, and 0_100 ratios) were spiked with P3HB, allowed to biodegrade for eight weeks, and then planted with sprouted lettuce seeds, which were cultivated for another eight weeks. P3HB addition inhibited plant growth and root development in all soil-sand mixtures. However, increasing the sand proportion enhanced plants' nitrogen content by 13-45 % compared to 100 % soil + P3HB. Depending on the sand-to-soil ratio, P3HB stimulated most enzymes involved in carbon, nitrogen and phosphorus acquisition. Basal and substrate-induced respirations were 9-209 % higher under P3HB addition compared to P3HB-free soil, likely due to an increase in the stabilized soil organic matter fraction. Residual P3HB analysis revealed that diluting soil with 20 % sand accelerated biodegradation, despite a decrease in bacterial abundance. In the 80_20 variant, the microbial community shifted toward higher fungal abundance, 19 % more than in 100_0 soil. While microbial proliferation was observed, it effect was outweighed by negative impacts on dry aboveground and root biomass. The highest P3HB biodegradation rate occurred in the 80_20 variant, underscoring soil texture as a critical factor in P3HB biodegradation. While microbial communities can degrade bioplastics, this process may compromise plant nutrient availability and hinder plant growth
Faktoren einer TikTok-Branding-Strategie: Einfluss auf Reichweite und Engagement am Beispiel der Firma Tepto GmbH
Get PDFInklusive Gestaltung von Gesellschaftsspielen - Barrierefreies Grafikdesign in Bezug auf Sehbehinderungen
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Impact of equivalent sterilization processes with different time- temperature combinations on the chemical, physical and sensory properties of carrot juice
No full textThermal preservation is widely used for the stabilization of fruit and vegetable juices. However, this method can potentially impair product quality and it is necessary to categorize and quantify these changes in order to optimize the treatment process. Here, carrot juice was treated with different time temperature combinations selected to achieve equivalent microbiological lethality. Different temperatures were selected - low temperature long time (LTLT) with 90 and 95 °C and high temperature short time (HTST) with 120 and 125 °C. The thermally treated juice exhibited significant differences in physical, chemical and sensory parameters in contrast to untreated juice. HTST treatment had less of a negative effect on the juice. A significant deterioration in odor, appearance and taste was observed after the LTLT treatment compared to an untreated reference juice. The juice exhibited elevated acid taste, a shift in olfactory profile from white to red vegetables and diminished homogeneity. Significant changes in sugar composition, pH, carotenoids and color were also observed during this treatment. The juice that had been treated with LTLT exhibited a higher amount of monosaccharides, a lower pH value, a reduced quantity of carotenoids and a perceptible difference in color in comparison to the untreated and fresh juice. Therefore, it can be concluded that varying temperatures show different effects on juice quality, despite the same microbiological lethal effect. This must be taken into account when designing the pasteurization process
