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See detailTrajectory Tracking for Robotic Freeform Grinding
Klecker, Sophie UL; Plapper, Peter UL

in Cahier Scientifique - Revue Technique Luxembourgeoise (2016), 1(2016), 6-7

Unergonomic working conditions, a decline in available labour force and uncompetitively high salaries make automation an attractive solution for a variety of manufacturing processes. To achieve successful ... [more ▼]

Unergonomic working conditions, a decline in available labour force and uncompetitively high salaries make automation an attractive solution for a variety of manufacturing processes. To achieve successful automation of even complex, contact-based manufacturing processes, inspiration is more and more found in nature. In this work, a biomimetic approach is chosen to address the grinding process of freeform geometries by industrial robots. [less ▲]

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See detailEditorial
Plapper, Peter UL

in Cahier Scientifique - Revue Technique Luxembourgeoise (2016), 1

Editorial comment at the start of the scientific edition of the Revue Technique, reflecting the needs of the country and the content of the journal.

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See detailUse of recycled concrete in construction in Luxembourg
Waldmann, Danièle UL; Thapa, Vishojit Bahadur UL

in Cahier Scientifique - Revue Technique Luxembourgeoise (2015)

Construction and demolition waste constitutes a major portion of total waste production in the world, and most of it is used in landfills. The re-use of concrete rubble collected from demolished ... [more ▼]

Construction and demolition waste constitutes a major portion of total waste production in the world, and most of it is used in landfills. The re-use of concrete rubble collected from demolished structures is an important issue. After crushing and screening, there is the possibility of appropriately treating and reusing such waste as aggregate in new concrete, especially in lower level applications. Different aspects of the topic beginning with a brief review of the European initiatives and definition in terms of C&D waste generated and recycled aggregates produced from C&D waste are given. Along with a brief overview of C&D waste, a summary of the situation in Luxembourg in use of recycled aggregate is discussed. This writing concludes by identifying some of the major barriers in more use of recycled aggregate concrete, including lack of awareness, lack of knowledge, barriers of specifications/codes for reusing these aggregates in new concrete. [less ▲]

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See detailDistributed Harmonic Compensation for Power Quality in Smart Grids
Kobou Ngani, Patrick UL; Hadji-Minaglou, Jean-Régis UL; Marso, Michel UL et al

in Cahier Scientifique - Revue Technique Luxembourgeoise (2014)

It is now well known that the quality of electric power is a key factor for the electricity service. It defines how good the characteristics (amplitude and frequency) of the supplied power meet the rated ... [more ▼]

It is now well known that the quality of electric power is a key factor for the electricity service. It defines how good the characteristics (amplitude and frequency) of the supplied power meet the rated ones. Voltage dip (or sag) and swell, short and long interruptions, voltage spike, under and over voltage, harmonic distortion, voltage unbalance are the common power quality problems. Among these last, the harmonics issue is getting more and more important over the last decades and this trend will surely continue its race. This is essentially due to the widespread use of electronic components in electric equipment: it changes the nature of the electric loads from linear to non-linear and makes them, on the one hand, responsible for the harmonics generation in the power grid but very sensitive to the power quality problems on the other hand. [less ▲]

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See detailThe soil of Luxembourg and the weak Rhaetian clay
Van Baars, Stefan UL

in Cahier Scientifique - Revue Technique Luxembourgeoise (2014), 2013(2), 34-37

Luxembourg is geologically divided into two parts: Oesling in the North and Gutland in the Middle and South. Oesling is part of the Ardennes plateau. Gutland was formed in the Triassic and Jurassic ages ... [more ▼]

Luxembourg is geologically divided into two parts: Oesling in the North and Gutland in the Middle and South. Oesling is part of the Ardennes plateau. Gutland was formed in the Triassic and Jurassic ages and is much younger than Oesling. It consists mainly of sedimentary rocks. Luxembourg has a variety of interesting, weak or problematic soils, such as the swelling gypsum layers, the layered schists of Wiltz and especially the weak Keuper-Rhaetian-clay. The Rhaetian clay layer is mostly rather thin and is found at a relatively constant altitude and the band where it comes to the surface is identified by the varying erosion erratically found throughout Gutland. Approximately two third of all landslides are found along this line. Hence it was decided to investigate the Rhaetian clay in the geotechnical laboratory of the University of Luxembourg. Samples were taken from a pit at Rue de Mühlenbach on the north side of the city of Luxembourg and from a sliding slope of a building pit in Schutrange. The friction angle was found to be phi = 8° at Mühlenbach and phi = 13° at Schuttrange, which are both record low friction angles, which explains the high number of landslides in Luxembourg. [less ▲]

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See detailGNSS Meteorology in Luxembourg
Ahmed, Furqan UL; Teferle, Felix Norman UL; Bingley, Richard et al

in Cahier Scientifique - Revue Technique Luxembourgeoise (2012), (1), 16-22

Atmospheric water vapour is a primary greenhouse gas and plays an important role in weather forecasting and climate monitoring. Global Navigation Satellite System (GNSS) signals experience a propagation ... [more ▼]

Atmospheric water vapour is a primary greenhouse gas and plays an important role in weather forecasting and climate monitoring. Global Navigation Satellite System (GNSS) signals experience a propagation delay, which is related to the amount of water vapour in the lower atmosphere. Hence GNSS observations can be processed to estimate this delay with millimetre-level accuracy and together with meteorological data can be used to compute the amount of atmospheric water vapour on various temporal and spatial scales. [less ▲]

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See detailWIE VIEL ENERGIE VERBRAUCHEN NEUE UNTERRICHTS- UND BÜROGEBÄUDE IN LUXEMBURG?
Maas, Stefan UL; Scholzen, Frank UL; Thewes, Andreas UL et al

in Cahier Scientifique - Revue Technique Luxembourgeoise (2012)

In Luxemburg hat sich in den vergangenen Jahren der nationale Energieverbrauch ebenfalls verstärkt zum Gebäudesektor hin verändert. Während 1990 noch 71 % des gesamten Energieverbrauches auf den ... [more ▼]

In Luxemburg hat sich in den vergangenen Jahren der nationale Energieverbrauch ebenfalls verstärkt zum Gebäudesektor hin verändert. Während 1990 noch 71 % des gesamten Energieverbrauches auf den Industriesektor zurückzuführen waren und nur 20 % auf die Gebäude, hat sich dies bis zum Jahr 2009 deutlich verändert. Demzufolge entfallen nur noch 30 % auf den Industriesektor, 25 % auf Verkehr (nach Abzug der Treibstoffexporte) und 45 % auf den Verbrauch des Tertiären Sektors3, welcher sowohl die privaten und die öffentlichen Haushalte, als auch Dienstleistungsgebäude beinhaltet. Die Direktive 2010/31/EG2 fordert von den Mitgliedstaaten die nationalen Normen weiterhin zu verschärfen und Pläne zu erstellen, um die Anzahl an Niedrigstenergiegebäuden weiter zu erhöhen. Um die Energieströme in Gebäuden besser zu verstehen, Sparmaßnahmen zu erarbeiten und mögliche Bewertungen über das Energieeinsparpotential für Gebäude durchführen zu können, sind jedoch aussagekräftige Verbrauchsdatenanalysen notwendig, die leider oftmals noch nicht in verlässlicher Qualität vorliegen. In der Direktive wird zudem empfohlen für die Berechnung eine Unterteilung aller Gebäude in angemessene Kategorien vorzunehmen, welche von Einfamilienhäusern (EFH), über Bürogebäude und Unterrichtsgebäude bis hin zu Krankenhäuser, Hotels und Sportanlagen reicht. In einer ersten Studie der Universität Luxemburg4 wurden bereits neuere EFH in Luxemburg hinsichtlich ihres realen Energieverbrauches untersucht und ausgewertet. [less ▲]

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See detailLASERFÜGEN UNGLEICHER WERKSTOFFE_
Plapper, Peter UL

Article for general public (2012)

Luxemburgs Wirtschaft weist eine starke Abhängigkeit vom tertiären Sektor auf. Der sekundäre Sektor mit den produzierenden Unternehmen offenbart auch im Vergleich zu den Nachbarn Nachholpotential. Dabei ... [more ▼]

Luxemburgs Wirtschaft weist eine starke Abhängigkeit vom tertiären Sektor auf. Der sekundäre Sektor mit den produzierenden Unternehmen offenbart auch im Vergleich zu den Nachbarn Nachholpotential. Dabei sind die Voraussetzungen für den Ausbau der wertschöpfenden Fertigung in Luxemburg sehr gut. Das zeigt sich an mehreren Werken international renommierter Konzerne, die von einem dichten Netz an wettbewerbsfähigen KMU mit einem breiten Produktportfolio ergänzt werden. Das Laser Technologie Kompetenz Zentrum will Klein- und Mittelbetrieben sowie internationalen Firmen mit neuen Erkenntnissen aus der Lasertechnologie und mit der Ausbildung von Fachkräften unterstützen. Im Rahmen von Machbarkeitsstudien werden applikationsspezifi sche Prozessparameter untersucht, Prozessfenster defi niert und produktionsrelevantes Knowhow rund um die lasergestützte Fertigung erarbeitet. [less ▲]

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See detailVerbesserung des Fertigungsablaufs von Spezialwerkzeugen
Plapper, Peter UL; Jacobs, Guy; Plantier, Stefan et al

in Cahier Scientifique - Revue Technique Luxembourgeoise (2010)

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