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Textes d'étude. R. Léon Wagner

Marcel Françon
1951 Speculum  
Marcel Frangon, ‘Rondeaux tercets,’ SpecuLuM, xxiv (1949), 87-92. C. C. Olson, ‘Chaucer and the Music of the XIVth century,’ Specutum, xvi (1941), 64. E. Droz, G. Thibault, Y.  ...  Wagner complains that, in France, French literature is taught as if it began in the sixteenth century.?  ... 
doi:10.2307/2852436 fatcat:2kvqz3qcwjh2hcs4g7ztewmo2q

Video-Dna: Large-Scale Server-Side Watermarking

Ivan Kopilovic, Virginie Drugeon, Marcel Wagner
2007 Zenodo  
Publication in the conference proceedings of EUSIPCO, Poznan, Poland, 2007
doi:10.5281/zenodo.40672 fatcat:otk6xlqdhjdzbmdbo6diprkxsu

Conformal quantum field theory in various dimensions [article]

Marcel Bischoff, Daniel Meise, Karl-Henning Rehren, Ingo Wagner
2009 arXiv   pre-print
Various relations between conformal quantum field theories in one, two and four dimensions are explored. The intention is to obtain a better understanding of 4D CFT with the help of methods from lower dimensional CFT.
arXiv:0908.3391v1 fatcat:7ltfiskdfvg6xayeyofq4ansza

"Bürgerarbeit" und "mitfühlender Konservatismus"

Marcel Erlinghagen, Gert G. Wagner
2001 WiSt - Wirtschaftswissenschaftliches Studium  
Bundespräsident Rau hat zu überlegen gegeben, ob ehrenamtliches Engagement durch Rentenanwartschaften belohnt werden sollte (Rau, 2000), d.h. dass praktisch eine -wenn auch bescheidene -staatliche Bezahlung für (ausgewählte?) ehrenamtlich Tätige erfolgen würde. Wäre eine solche Unterstützung "informeller Arbeit" sinnvoll? Die Frage soll vor dem Hintergrund diskutiert werden, dass in Deutschland viele Sozialwissenschaftler glauben, "informelle" Arbeit, die außerhalb der Erwerbswirtschaft
more » ... wird, könnte eine Lösung des Arbeitslosenproblems sein (vgl. insbes. Beck, 2000). Die Frage hat auch insofern an Bedeutung gewonnen, weil der US-amerikanische Präsident George W. Bush mit seinem Programm des mitfühlenden Konservatismus (vgl. dazu Olasky, 1996) professionelle Sozialarbeit durch informelle ehrenamtliche Arbeit ersetzen will, da er davon überzeugt ist, dass dadurch die Qualität "sozialer Dienste" besser wird und Effizienzverluste, die durch "Abgabewiderstand" entstehen, vermieden werden können.
doi:10.15358/0340-1650-2001-12-635 fatcat:odejnzchr5hvbmjckqyqyyzoxy

Video Coding With Quad-Trees And Adaptive Vector Quantization

Marcel Wagner, Dietmar Saupe
2015 Zenodo  
Publication in the conference proceedings of EUSIPCO, Tampere, Finland, 2000
doi:10.5281/zenodo.37412 fatcat:lw2thk7rzzfgdf2e6qqtttrtte

Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors [article]

Clemens Kuhlenkamp, Michael Knap, Marcel Wagner, Richard Schmidt, Atac Imamoglu
2021 arXiv   pre-print
Feshbach resonances are an invaluable tool in atomic physics, enabling precise control of interactions and the preparation of complex quantum phases of matter. Here, we theoretically analyze a solid-state analogue of a Feshbach resonance in two dimensional semiconductor heterostructures. In the presence of inter-layer electron tunneling, the scattering of excitons and electrons occupying different layers can be resonantly enhanced by tuning an applied electric field. The emergence of an
more » ... yer Feshbach molecule modifies the optical excitation spectrum, and can be understood in terms of Fermi polaron formation. We discuss potential implications for the realization of correlated Bose-Fermi mixtures in bilayer semiconductors.
arXiv:2105.01080v1 fatcat:eabqm5ycvbhflebdhqkkb2dvfe

The catastrophic final flooding of Doggerland by the Storegga Slide tsunami

Bernhard Weninger, Rick Schulting, Marcel Bradtmöller, Lee Clare, Mark Collard, Kevan Edinborough, Johanna Hilpert, Olaf Jöris, Marcel Niekus, Eelco J. Rohling, Bernd Wagner
2008 Documenta Praehistorica  
Around 8200 calBP, large parts of the now submerged North Sea continental shelf ('Doggerland') were catastrophically flooded by the Storegga Slide tsunami, one of the largest tsunamis known for the Holocene, which was generated on the Norwegian coastal margin by a submarine landslide. In the present paper, we derive a precise calendric date for the Storegga Slide tsunami, use this date for reconstruction of contemporary coastlines in the North Sea in relation to rapidly rising sea-levels, and
more » ... scuss the potential effects of the tsunami on the contemporaneous Mesolithic population. One main result of this study is an unexpectedly high tsunami impact assigned to the western regions of Jutland.
doi:10.4312/dp.35.1 fatcat:4j334wowtfffrb447ggip35fke

Morale sociale: Lecons professees au College libre des Sciences sociales.MM. G. Belot, Marcel Bernes , Brunschvigg F. Buisson , Dauriac, Delbit, Ch. Gide, M. Kovalevsky , Malapert, R. P. Maumus , De Roberty , G. Sorel , Le Pasteur Wagner

1904 American Journal of Sociology  
SoreEL, LE Pas- TEUR WAGNER. Préface d’EmiLe Bonrrovux. Paris: Félix Alcan, 1899. Pp. 319.  ... 
doi:10.1086/211260 fatcat:mstd6jug65call7ppjefa3qzhm

Felsenkeller 5 MV underground accelerator: Towards the Holy Grail of Nuclear Astrophysics 12C(α, γ)16O

Daniel Bemmerer, Thomas E. Cowan, Marcel Grieger, Sebastian Hammer, Thomas Hensel, Arnd R. Junghans, Martina Koppitz, Felix Ludwig, Stefan E. Müller, Bernd Rimarzig, Stefan Reinicke, Ronald Schwengner (+8 others)
2018 EPJ Web of Conferences  
Low-background experiments with stable ion beams are an important tool for putting the model of stellar hydrogen, helium, and carbon burning on a solid experimental foundation. The pioneering work in this regard has been done by the LUNA collaboration at Gran Sasso, using a 0.4 MV accelerator. The present contribution reviews the status of the project for a higher-energy underground accelerator in Felsenkeller, Germany. Results from γ-ray, neutron, and muon background measurements in the
more » ... eller underground site in Dresden, Germany, show that the background conditions are satisfactory. Two tunnels of the Felsenkeller site have recently been refurbished for the installation of a 5 MV high-current Pelletron accelerator. Civil construction work has completed in March 2018. The accelerator will provide intense, 50 µA, beams of 1 H + , 4 He + , and 12 C + ions, enabling research on astrophysically relevant nuclear reactions with unprecedented sensitivity.
doi:10.1051/epjconf/201817801008 fatcat:fofppqtaanbvxfgaawfceumivi

Replikationen, Reputation und gute wissenschaftliche Praxis

Benedikt Fecher, Mathis Fräßdorf, Marcel Hebing, Gert G. Wagner
2017 Information, Wissenschaft und Praxis  
Einer der Autoren des vorliegenden Beitrags ist an dieser Initiative beteiligt.Benedikt Fecher, Mathis Fräßdorf, Marcel Hebing und Gert G. Wagner, Replikationen und Reputation  ...  gerade einmal 0,1 Prozent aller wissenschaftlichen Artikel aus den Top-50 der wirtschaftswissenschaftlichen Zeitschriften Replikationsstudien im engeren Sinne sind (Mueller-Langer, Fecher, Harhoff & Wagner  ... 
doi:10.1515/iwp-2017-0025 fatcat:xfzauiezhbfjxck7rvsaqlisca

Geometric Crossing-Minimization - A Scalable Randomized Approach

Marcel Radermacher, Ignaz Rutter, Michael Wagner
2019 European Symposium on Algorithms  
We consider the minimization of edge-crossings in geometric drawings of graphs G = (V, E), i.e., in drawings where each edge is depicted as a line segment. The respective decision problem is N P-hard [5] . Crossing-minimization, in general, is a popular theoretical research topic; see Vrt'o [26]. In contrast to theory and the topological setting, the geometric setting did not receive a lot of attention in practice. Prior work [21] is limited to the crossing-minimization in geometric graphs with
more » ... less than 200 edges. The described heuristics base on the primitive operation of moving a single vertex v to its crossing-minimal position, i.e., the position in R 2 that minimizes the number of crossings on edges incident to v. In this paper, we introduce a technique to speed-up the computation by a factor of 20. This is necessary but not sufficient to cope with graphs with a few thousand edges. In order to handle larger graphs, we drop the condition that each vertex v has to be moved to its crossing-minimal position and compute a position that is only optimal with respect to a small random subset of the edges. In our theoretical contribution, we consider drawings that contain for each edge uv ∈ E and each position p ∈ R 2 for v o(|E|) crossings. In this case, we prove that with a random subset of the edges of size Θ(k log k) the co-crossing number of a degree-k vertex v, i.e., the number of edge pairs uv ∈ E, e ∈ E that do not cross, can be approximated by an arbitrary but fixed factor δ with high probability. In our experimental evaluation, we show that the randomized approach reduces the number of crossings in graphs with up to 13 000 edges considerably. The evaluation suggests that depending on the degree-distribution different strategies result in the fewest number of crossings.
doi:10.4230/lipics.esa.2019.76 dblp:conf/esa/RadermacherR19 fatcat:t4ftxlolibaglfi6ehoggfvgy4

Decomposing the hypercube Qn into n isomorphic edge-disjoint trees

Stephan Wagner, Marcel Wild
2012 Discrete Mathematics  
We show that the edge set of the n-dimensional hypercube Q n is the disjoint union of the edge sets of n isomorphic trees.
doi:10.1016/j.disc.2012.01.033 fatcat:db55iphyxbfr7jbyi6mtvricym

Long-term monitoring data from a naturally ventilated office building

Marcel Schweiker, Michael Kleber, Andreas Wagner
2019 Scientific Data  
*email: marcel. schweiker@kit.edu DaTa DEScripTor opEN www.nature.com/scientificdata www.nature.com/scientificdata/ occupants can also control the exterior Venetian blinds and the artificial lighting of  ... 
doi:10.1038/s41597-019-0283-3 pmid:31772207 pmcid:PMC6879735 fatcat:vkm53spfzfaunnofl3sjegg524

Waste Reduction by Product-Quality Based Scheduling in Food Processing

Marcel Wagner, Stefan Kaluschke, Fabian Keller, Gunther Reinhart
2016 Procedia CIRP  
Related to resource efficiency waste reduction is the crucial point in the processing of food. As shown in different Food Waste Studies the amount of waste in food processing is enormous. Up to 400.000 metric tons of edible food is disposed every year caused by wrong treatment, handling and processing. Processing is the major point to deal with. In the case of manual processing in a cantina kitchen waste can be classified into waste associated with overproduction, product damages or technical
more » ... terruptions. To reduce the amount of loss by using technical solutions it is possible to reduce up to 60 % of loss during the processing. Related to the product itself the automation and especially the scheduling of the processes in a commercial kitchen is more complex than the scheduling of standard products e.g. in the automotive sector. This article shows a solution to extend the criteria of production planning within an automated food processing environment. The paper introduces a product model that prescribes the progress of product quality while processing.
doi:10.1016/j.procir.2016.01.138 fatcat:77ex4irgcjg5foda7jtgql3aq4

The Role of Temporal Trends in Growing Networks

Osnat Mokryn, Allon Wagner, Marcel Blattner, Eytan Ruppin, Yuval Shavitt, Constantine Dovrolis
2016 PLoS ONE  
The rich get richer principle, manifested by the Preferential attachment (PA) mechanism, is widely considered one of the major factors in the growth of real-world networks. PA stipulates that popular nodes are bound to be more attractive than less popular nodes; for example, highly cited papers are more likely to garner further citations. However, it overlooks the transient nature of popularity, which is often governed by trends. Here, we show that in a wide range of real-world networks the
more » ... nt popularity of a node, i.e., the extent by which it accumulated links recently, significantly influences its attractiveness and ability to accumulate further links. We proceed to model this observation with a natural extension to PA, named Trending Preferential Attachment (TPA), in which edges become less influential as they age. TPA quantitatively parametrizes a fundamental network property, namely the network's tendency to trends. Through TPA, we find that real-world networks tend to be moderately to highly trendy. Networks are characterized by different susceptibilities to trends, which determine their structure to a large extent. Trendy networks display complex structural traits, such as modular community structure and degree-assortativity, occurring regularly in real-world networks. In summary, this work addresses an inherent trait of complex networks, which greatly affects their growth and structure, and develops a unified model to address its interaction with preferential attachment.
doi:10.1371/journal.pone.0156505 pmid:27486847 pmcid:PMC4972377 fatcat:a2ujiiprh5brzpyb5karwgdreu
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