Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailAbsolute gravity measurements at the Conrad Observatory by the University of Luxembourg
Francis, Olivier UL

Article for general public (2014)

Detailed reference viewed: 146 (12 UL)
Full Text
See detailAbsolute gravity measurements in Belgium: a tool for geodynamic interpretation
Van Camp, Michel; Francis, Olivier UL; Camelbeeck, Thierry

in Degryse, Patrick; Sintubin, Manuel (Eds.) Contributions to the Geology of Belgium and Northwest Europe (2002)

Detailed reference viewed: 53 (2 UL)
Full Text
Peer Reviewed
See detailABSOLUTE LOCALIZATION FOR SURFACE ROBOTICS IN GPS-DENIED ENVIRONMENTS USING A NEURAL NETWORK.
Wu, Ben; Ludivig, Philippe UL; Potter, Ross et al

Poster (2020, October 23)

Accurate localization in surface robotics is essential for navigation, path planning, and science objectives. On Earth, absolute localization can be readily achieved via satellite navigation (e.g., GPS ... [more ▼]

Accurate localization in surface robotics is essential for navigation, path planning, and science objectives. On Earth, absolute localization can be readily achieved via satellite navigation (e.g., GPS). For other planetary bodies such as the Moon or Mars, however, such systems are unavailable. Current methods for absolute localization of planetary rovers rely on time- and labor-intensive human visual matching of surface perspective features with satellite images. Relative localization also accumulates errors over time, with different methods estimating dissimilar locations (e.g., [1]). Thus, an absolute localization method that can quickly, automatically, and accurately reduce the position search space is of great benefit to future planetary exploration missions. This project [2] presents a new approach to localizing planetary rovers: training an artificial neural network to match surfaceperspective imagery to corresponding satellite maps. [less ▲]

Detailed reference viewed: 23 (0 UL)
Full Text
Peer Reviewed
See detailAbsorber composition: A critical parameter for the effectiveness of heat treatments in chalcopyrite solar cells
Sood, Mohit UL; Elanzeery, Hossam UL; Adeleye, Damilola UL et al

in Progress in Photovoltaics (2020)

Post-device heat treatment (HT) in chalcopyrite [Cu(In,Ga)(S,Se)2] solar cells is known to improve the performance of the devices. However, this HT is only beneficial for devices made with absorbers grown ... [more ▼]

Post-device heat treatment (HT) in chalcopyrite [Cu(In,Ga)(S,Se)2] solar cells is known to improve the performance of the devices. However, this HT is only beneficial for devices made with absorbers grown under Cu-poor conditions but not under Cu excess.. We present a systematic study to understand the effects of HT on CuInSe2 and CuInS2 solar cells. The study is performed for CuInSe2 solar cells grown under Cu-rich and Cu-poor chemical potential prepared with both CdS and Zn(O,S) buffer layers. In addition, we also study Cu-rich CuInS2 solar cells prepared with the suitable Zn(O,S) buffer layer. For Cu-poor selenide device low-temperature HT leads to passivation of bulk, whereas in Cu-rich devices no such passivation was observed. The Cu-rich devices are hampered by a large shunt. The HT decreases shunt resistance in Cu-rich selenides, whereas it increases shunt resistance in Cu-rich sulfides.. The origin of these changes in device performance was investigated with capacitance-voltage measurement which shows the considerable decrease in carrier concentration with HT in Cu-poor CuInSe2, and temperature dependent current-voltage measurements show the presence of barrier for minority carriers. Together with numerical simulations, these findings support a highly-doped interfacial p+ layer device model in Cu-rich selenide absorbers and explain the discrepancy between Cu-poor and Curich device performance. Our findings provide insights into how the same treatment can have a completely different effect on the device depending on the composition of the absorber. [less ▲]

Detailed reference viewed: 101 (6 UL)
Full Text
Peer Reviewed
See detailAbsorption Coefficient of a Semiconductor Thin Film from Photoluminescence
Rey, Germain UL; Spindler, Conrad UL; Rachad, Wafae UL et al

in Physical Review Applied (2018), 9

Detailed reference viewed: 191 (14 UL)
Full Text
Peer Reviewed
See detailAbsorption of BN nanotubes under the influence of a perpendicular electric field
Attaccalite, Claudio; Wirtz, Ludger UL; Marini, Andrea et al

in PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS (2007), 244(11), 4288-4292

We calculate the optical absorption spectra of prototype (6,6) and (9,9) BN nanotubes in the presence of a perpendicular electric field. This model mimics a gated BN nanotube device. Even though the band ... [more ▼]

We calculate the optical absorption spectra of prototype (6,6) and (9,9) BN nanotubes in the presence of a perpendicular electric field. This model mimics a gated BN nanotube device. Even though the band-gap of the tubes decreases strongly as a function of the electric field strength, the absorption spectrum of the pure tubes remains remarkably constant up to high field-strength. We show that, in contrast, the levels which are responsible for defect-mediated photo-luminescence are shifted by the electric field. We address the use of BN nanotubes for optoelectronic applications. 0 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. [less ▲]

Detailed reference viewed: 276 (0 UL)
Full Text
Peer Reviewed
See detailAbsorptive Capacity and Post-Merger Inventor Productivity
Hussinger, Katrin UL

in Journal of Technology Transfer (2012)

Inventors often experience a low productivity after their company has been subject to a merger or acquisition (M&As). It is of central managerial interest to identify factors facilitating the integration ... [more ▼]

Inventors often experience a low productivity after their company has been subject to a merger or acquisition (M&As). It is of central managerial interest to identify factors facilitating the integration of new inventive staff and thereby counteracting innovation declines after M&As. This paper provides empirical evidence into the role of acquiring firms’ absorptive capacity for the post-merger patent productivity of the acquired inventors. Based on a sample of 544 inventors employed by European acquisition targets in the period 2000–2001 it is shown that the post-merger productivity of acquired inventors is significantly higher within acquiring firms with a distinct absorptive capacity. It can be concluded that absorptive capacity is a firm capability that enhances the integration of inventors after firm takeovers. [less ▲]

Detailed reference viewed: 95 (5 UL)
Full Text
Peer Reviewed
See detailAbsprachen, Regeln, Sanktionen: gemeinsam erstellte Ordnungen einer Kinderkultur im Elementarbereich
Sujbert, Monika UL

in Kinder in der Schule. Zwischen Gleichaltrigenkultur und schulischer Ordnung. (2009)

Detailed reference viewed: 28 (1 UL)
Peer Reviewed
See detailAbstinenz im Schweigen, Verwicklungen und Verwirrungen in Ingmar Bergmans Drama „Persona“
Weber, Jean-Marie UL

Scientific Conference (2016, October)

Detailed reference viewed: 18 (0 UL)
Full Text
Peer Reviewed
See detailAbstract and Concrete Decision Graphs for Choosing Extensions of Argumentation Frameworks
Dauphin, Jérémie UL; Cramer, Marcos UL; van der Torre, Leon UL

in Computational Models of Argument (2018)

Most argumentation semantics allow for multiple extensions, which raises the question of how to choose among extensions. We propose to study this question as a decision problem. Inspired by decision trees ... [more ▼]

Most argumentation semantics allow for multiple extensions, which raises the question of how to choose among extensions. We propose to study this question as a decision problem. Inspired by decision trees commonly used in economics, we introduce the notion of a decision graph for deciding between the multiple extensions of a given AF in a given semantics. We distinguish between abstract decision graphs and concrete instantiations thereof. Inspired by the principle-based approach to argumentation, we formulate two principles that mappings from argumentation frameworks to decision graphs should satisfy, the principles of decision-graph directionality and that of directional decision-making. We then propose a concrete instantiation of decision graphs, which satisfies one of these principles. Finally, we discuss the potential for further research based on this novel methodology. [less ▲]

Detailed reference viewed: 108 (16 UL)
Full Text
See detailAbstract and Concrete Decision Graphs for Choosing Extensions of Argumentation Frameworks - Technical Report
Dauphin, Jérémie UL; Cramer, Marcos UL; van der Torre, Leon UL

Report (2018)

Most argumentation semantics allow for multiple extensions, which raises the question of how to choose among extensions. We propose to study this question as a decision problem. Inspired by decision trees ... [more ▼]

Most argumentation semantics allow for multiple extensions, which raises the question of how to choose among extensions. We propose to study this question as a decision problem. Inspired by decision trees commonly used in economics, we introduce the notion of a decision graph for deciding between the multiple extensions of a given AF in a given semantics. We distinguish between abstract decision graphs and concrete instantiations thereof. Inspired by the principle-based approach to argumentation, we formulate two principles that mappings from argumentation frameworks to decision graphs should satisfy, the principle of decision-graph directionality and the one of directional decision-making. We then propose a concrete instantiation of decision graphs, which satisfies one of these principles. Finally, we discuss the potential for further research based on this novel methodology. [less ▲]

Detailed reference viewed: 70 (4 UL)
Full Text
Peer Reviewed
See detailAbstract and concrete repetitive thinking modes in alcohol-dependence.
Grynberg, Delphine; de Timary, Philippe; Philippot, Pierre et al

in Journal of addictive diseases (2016), 35(4), 238-243

Emotional and interpersonal deficits play a crucial role in alcohol-related disorders as they predict alcohol consumption and relapse. Recent models of emotion regulation in psychopathology postulate that ... [more ▼]

Emotional and interpersonal deficits play a crucial role in alcohol-related disorders as they predict alcohol consumption and relapse. Recent models of emotion regulation in psychopathology postulate that these deficits are centrally related to increased abstract/analytic repetitive thinking, combined with reduced concrete/experiential repetitive thinking. As this assumption has not been tested in addictions, this study aimed at investigating repetitive thinking modes in a large sample of alcohol-dependent individuals. One hundred recently detoxified alcohol-dependent individuals (29 females; mean age = 49.51-years-old) recruited during the 3rd week of their treatment in a detoxification center were compared to 100 healthy controls (29 females; mean age = 48.51-years-old) recruited in the experimenters' social network, matched at the group level for age, gender, and educational level. All participants completed the Mini Cambridge Exeter Repetitive Thought Scale measuring abstract/analytic and concrete/experiential repetitive thinking modes as well as complementary psychopathological measures (Beck Depression Inventory and State/Trait Anxiety Inventory). Alcohol-dependent individuals have similar levels of concrete repetitive thinking as controls but report significantly higher levels of abstract repetitive thinking (p < 0.001; d = 1.28). This effect remains significant after controlling for depression and anxiety. Relative to healthy controls, alcohol-dependent patients report more frequent use of abstract/analytic repetitive thinking, with preserved concrete/experiential thinking. Despite the cross-sectional nature of the study, the frequent use of abstract repetitive thinking thus appears to constitute a main feature of alcohol-dependence. [less ▲]

Detailed reference viewed: 114 (2 UL)
Full Text
Peer Reviewed
See detailAbstract Normative Systems: Semantics and Proof Theory
Colombo Tosatto, Silvano UL; Boella, Guido; van der Torre, Leon UL et al

in PRINCIPLES OF KNOWLEDGE REPRESENTATION AND REASONING: PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE (2012)

In this paper we introduce an abstract theory of normative reasoning, whose central notion is the generation of obligations, permissions and institutional facts from conditional norms. We present various ... [more ▼]

In this paper we introduce an abstract theory of normative reasoning, whose central notion is the generation of obligations, permissions and institutional facts from conditional norms. We present various semantics and their proof systems. The theory can be used to classify and compare new candidates for standards of normative reasoning, and to explore more elaborate forms of normative reasoning than studied thus far. [less ▲]

Detailed reference viewed: 89 (1 UL)
See detailAbstract, Exposé und Forschungsantrag. Eine Schreibanleitung für Studierende und junge Forschende
Huemer, Birgit UL; Rheindorf, Markus; Gruber, Helmut

Book published by Böhlau (2012)

Detailed reference viewed: 454 (6 UL)