Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen
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QI²: an interactive tool for data quality assurance
No full textThe importance of high data quality is increasing with the growing impact and distribution of ML systems and big data. Also, the planned AI Act from the European commission defines challenging legal requirements for data quality especially for the market introduction of safety relevant ML systems. In this paper, we introduce a novel approach that supports the data quality assurance process of multiple data quality aspects. This approach enables the verification of quantitative data quality requirements. The concept and benefits are introduced and explained on small example data sets. How the method is applied is demonstrated on the well-known MNIST data set based an handwritten digits
926 - Zweite Satzung zur Änderung der Prüfungsordnung für die Masterstudiengänge „Empowerment Studies“ und Empowerment Studies (Teilzeit)“ (MaPO ES) an der Hochschule Düsseldorf vom 14.03.2024
No full textAufgrund der §§ 2 Abs. 4, 64 Abs. 1 des Gesetzes über die Hochschulen des Landes Nordrhein-Westfalen (Hochschulgesetz - HG) vom 16.09.2014 (GV. NRW. S. 547) in der aktuell gültigen Fassung hat die Hochschule Düsseldorf die folgende Ordnung als Satzung erlassen
958 - Neubekanntmachung der Einschreibungsordnung der Hochschule Düsseldorf vom 27.06.2024
No full textNachstehend wird der Wortlaut der Einschreibungsordnung der Fachhochschule Düsseldorf vom 03.07.2012 (Verkündungsblatt der Hochschule Düsseldorf, Amtliche Mitteilung Nr. 304) neu bekannt gemacht
Gemeinsam nachhaltig wirken – Leitbild der Hochschule Düsseldorf
No full textEine erfolgreiche Zusammenarbeit zwischen allen Statusgruppen der Hochschulangehörigen stützt sich auf gemeinsame Wertevorstellungen, die in einem hochschulweiten Leitbild dokumentiert werden
Fluid flow and heat transfer of a novel passive cooling system for gearless wind turbines with a power range of 3–12 MW
No full textToday, the gearless horizontal axis wind turbines are mainstream in wind energy industry. High demands of electric power led to bigger systems and active cooling reduces the overall efficiency of the turbines. Passive cooling systems have been examined for the first time for a gearless wind energy generator with power range of 3–12 MW. With further developed heat conductors, it is possible to operate a wind generator in a larger power class with passive cooling components. This is accompanied by enormous cost savings due to elimination of costs for active cooling elements such as the use of fans, pumps, and heat exchangers. An additional factor is the significant reduction in necessary maintenance due to the minimized incidence of corrosion and wear. Design of the cooling fins and an ideal position of the generator within the housing of the wind turbine has been objectives. Mandatory is that maximum temperatures of the generator fins should stay under 155 °C, which could be reached with several designs for different heat exchanger geometries
Influence of the catalyst precursor for cobalt on activated carbon applied in ammonia decomposition
No full textAmmonia is a key compound for storing and transporting green hydrogen. However, the efficient release of stored hydrogen through thermocatalytic ammonia decomposition is achievable only at temperatures around 600 °C, particularly with non-noble metal-based catalysts, which prove to be both ecologically and economically more feasible. In this study, electrically conductive activated carbon was selected as the catalyst support, chosen specifically for its suitability in achieving more energy-efficient direct reactor heating through the ohmic resistance of the catalysts. Cobalt salts were wet impregnated on activated carbon investigating the influence of different precursors (cobalt nitrate and cobalt acetate) and pyrolysis temperatures (400 °C and 600 °C) under N2 flow on the cobalt particle size and the incorporation of cobalt into the carbon matrix. TEM imaging and CO-chemisorption revealed well dispersed cobalt particles with sizes below 10 nm for the catalysts synthesized from the cobalt nitrate precursor. On the other hand, cobalt acetate led to about nine times larger Co agglomerates, which were partially detached from the carbon matrix. Moreover, this substantial difference in the Co particle size results in a significantly higher ammonia conversion for cobalt nitrate-based catalysts, achieving 94 % of ammonia conversion at 600 °C. Furthermore, the long-term stability test of the cobalt nitrate-based catalyst resulted in a slight deactivation of only 2 % ammonia conversion at 500 °C
