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The paper deals with an asymptotic relative efficiency concept for confidence regions of multidimensional parameters that is based on the expected volumes of the confidence regions. Under standard conditions the asymptotic relative efficiencies of confidence regions are seen to be certain powers of the ratio of the limits of the expected volumes. These limits are explicitly derived for confidence regions associated with certain plugin estimators, likelihood ratio tests and Wald tests. Under regularity conditions, the asymptotic relative efficiency of each of these procedures with respect to each one of its competitors is equal to 1. The results are applied to multivariate normal distributions and multinomial distributions in a fairly general setting.
Laser-based Additive Manufacturing (AM) processes for the use of metals out of the powder bed have been investigated profusely and are prevalent in industry. Although there is a broad field of application, Laser Powder Bed Fusion (LPBF), also known as Selective Laser Melting (SLM) of glass is not fully developed yet. The material properties of glass are significantly different from the investigated metallic material for LPBF so far. As such, the process cannot be transferred, and the parameter limits and the process sequence must be redefined for glass. Starting with the characterization of glass powders, a parameter field is initially confined to investigate the process parameter of different glass powder using LPBFprocess. A feasibility study is carried out to process borosilicate glass powder. The effects of process parameters on the dimensional accuracy of fabricated parts out of borosilicate and hints for the post-processing are analysed and presented in this paper.
Aufgrund des § 2 Absatz 4 Satz 1 in Verbindung mit § 64 des Gesetzes über die Hochschulen des Landes Nordrhein-Westfalen (Hochschulgesetz – HG) vom 16. September 2014 (GV. NRW. S. 547), zuletzt geändert durch Artikel 3 des Gesetzes vom 17. Oktober 2017 (GV. NRW. S. 806), und der Rahmenprüfungsordnung (RPO) für die Bachelor- und Masterstudiengänge an der Fachhochschule Aachen vom 1. Februar 2018 (FH-Mitteilung Nr. 3/2018) hat der Fachbereich Architektur folgende Änderung der Prüfungsordnung vom 5. Juli 2018 (FH-Mitteilung Nr. 104/2018) erlassen.
Aufgrund des § 2 Absatz 4 Satz 1 in Verbindung mit § 64 des Gesetzes über die Hochschulen des Landes Nordrhein-Westfalen (Hochschulgesetz – HG) vom 16. September 2014 (GV. NRW. S. 547), zuletzt geändert durch Artikel 3 des Gesetzes
vom 17. Oktober 2017 (GV. NRW. S. 806), und der Rahmenprüfungsordnung (RPO) für die Bachelor- und Masterstudiengänge an der Fachhochschule Aachen vom 1. Februar 2018 (FH-Mitteilung Nr. 3/2018) hat der Fachbereich Architektur folgende
Änderung der Prüfungsordnung vom 5. Juli 2018 (FH-Mitteilung Nr. 105/2018) erlassen.
Optical Instruments require an extremely stable thermal surrounding to prevent loss of data quality by misalignments of the instrument components resulting from material deformation due to temperature f luctuations (e.g. from solar intrusion). Phase Change Material (PCM) can be applied as a thermal damper to achieve a more uniform temperature distribution. The challenge of this method is, among others, the integration of PCM into affected areas. If correctly designed, incoming heat is latently absorbed during phase change of the PCM, i.e. the temperature of a structure remains almost constant. In a cold phase, the heat during phase change is released again latently until the PCM returns to its original state of aggregation. Thus, the structure is thermally stabilized. At FH Aachen– University of Applied Sciences research is conducted to apply PCM directly into the structures of affected components (baffles, optical benches, electronic boxes, etc.). Through the application of Additive Manufacturing, the necessary voids are directly printed into these structures and filled later with PCM. Additive Manufacturing enables complex structures that would not have been possible with conservative manufacturing methods. A corresponding Breadboard was developed and manufactured by Selective Laser Melting (SLM). The current state of research includes the handling and analysis of the Breadboard, tests and a correlation of the thermal model. The results have shown analytically and practically that it is possible to use PCM as an integral part of the structure as a thermal damper. The results serve as a basis for the further development of the technology, which should maximize performance and enable the integration of PCM into much more complex structures.
Postural and metabolic benefits of using a forearm support walker in older adults with impairments
(2019)
Praxistransfer in der tertiären Bildungsforschung: Modelle, Gelingensbedingungen und Nachhaltigkeit
(2019)