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See detailXFEM coupling techniques for landslide-fluid interaction
Pasenow, Frithjof; Zilian, Andreas UL

Scientific Conference (2011)

Selected topographies on earth are threatened by sudden landslides on natural or artificial hillsides. Dur- ing landslides natural granular materials exhibit phase transitions from solid-like to fluid ... [more ▼]

Selected topographies on earth are threatened by sudden landslides on natural or artificial hillsides. Dur- ing landslides natural granular materials exhibit phase transitions from solid-like to fluid-like behavior [1]. In order to describe such materials interacting with surrounding fluids a material formulation allow- ing a switch from solid- to fluid-like state is developed. The solid-like state of the granular is modeled as compressible elastic material in an eulerian framework, while the surrounding fluid is described by an incompressible newtonian fluid. Discretization of the balance equations is carried out with a stabilized space-time finite element method [2]. The domain of elastic material utilizes mixed-hybrid space-time elements while for the surrounding fluid standard velocity-pressure elements [3] are used. Interaction of both continua is described with an interface-coupled formulation where the level-set technique [4] is employed for the interface motion. The challenge of the introduced model is the coupling of fields with discontinuous state variables as well as fieldwise different state variables. Available coupling techniques in the context of the extended finite element method and based on localized mixed hybrid formulations [5] will be discussed and evaluated numerically by means of selected 2D examples. [less ▲]

Detailed reference viewed: 75 (1 UL)
See detailXFEM modelling of delamination in composite materials
Cahill, L.; Natarajan, S.; McCarthy, C. et al

Scientific Conference (2010)

Detailed reference viewed: 101 (0 UL)
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See detailXFEM with global enrichment for 3D cracks
Agathos, Kostas; Chatzi, Eleni; Bordas, Stéphane UL et al

Scientific Conference (2015, June 17)

We present an extended finite element method (XFEM) based on fixed area enrichment which 1) suppresses the difficulties associated with ill-conditioning, even for "large" enrichment radii; 2) requires 50 ... [more ▼]

We present an extended finite element method (XFEM) based on fixed area enrichment which 1) suppresses the difficulties associated with ill-conditioning, even for "large" enrichment radii; 2) requires 50 times fewer enriched degrees of freedom (for a typical mesh) as the standard XFEM with geometrical enrichment (for the same or better accuracy level); 3) increases the accuracy level of the stress intensity factors and leads to "smooth" stress intensity variations along the crack front. [less ▲]

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See detailXLME interpolants, a seamless bridge between XFEM and enriched meshless methods
Amiri, F.; Anitescu, C.; Arroyo, M. et al

in Computational Mechanics (2013)

In this paper, we develop a method based on local maximum entropy shape functions together with enrichment functions used in partition of unity methods to discretize problems in linear elastic fracture ... [more ▼]

In this paper, we develop a method based on local maximum entropy shape functions together with enrichment functions used in partition of unity methods to discretize problems in linear elastic fracture mechanics. We obtain improved accuracy relative to the standard extended finite element method at a comparable computational cost. In addition, we keep the advantages of the LME shape functions, such as smoothness and non-negativity. We show numerically that optimal convergence (same as in FEM) for energy norm and stress intensity factors can be obtained through the use of geometric (fixed area) enrichment with no special treatment of the nodes near the crack such as blending or shifting. © 2013 Springer-Verlag Berlin Heidelberg. [less ▲]

Detailed reference viewed: 272 (1 UL)
See detailAn XML Format Secure protocol-OpenSST
Zhang, Xinhua UL; Jiang, Chunyan; Meinel, Christoph

in The 3rd ACS/IEEE International Conference on Computer Systems and Applications (2005)

OpenSST (Open Simple Secure Transaction) is a free software project and aims to create an efficient, open and secure alternative to the secure proprietary transaction protocol. OpenSST uses XML syntax to ... [more ▼]

OpenSST (Open Simple Secure Transaction) is a free software project and aims to create an efficient, open and secure alternative to the secure proprietary transaction protocol. OpenSST uses XML syntax to specify its message format, and relies on prevalent cryptographic algorithms to secure the transaction. OpenSST is designed to provide user with the guarantee on confidentiality, integrity, authenticity and non-repudiation. One feature of OpenSST's is that it defines a simple message structure so that it can easily be integrated into different usage frameworks. This paper mainly describes OpenSST's logic architecture and message format through an http-based prototype. [less ▲]

Detailed reference viewed: 50 (1 UL)
See detailXXIV Workshop on Geometric Methods in Physics, Bialowieza, Poland, June 26 - July 2, 2005, Proceedings Special issue of the Journal of Geometry and Symmetry in Physics, containting vol. 5 and 6
Ali, Syed Twareque UL; Gazeau, Jean-Pierre; Goldin, Gerald A. et al

Book published by Institute of Biophysics, Bulgarian Academy of Sciences (2006)

Detailed reference viewed: 28 (0 UL)
See detailXXIX workshop on geometric methods in physics, Bia\lowie\Dza Poland, June 27 -- July 3, 2010. Selected papers based on the presentations at the workshop.
Kielanowski, Piotr; Buchstaber, Victor; Anatol, Odzijewicz et al

Book published by AIP Conference Proceedings 1307. Melville, NY: American Institute of Physics (AIP). ix, 220~p. EUR~129.95/net; SFR~151.00; \sterling~95.00 \$~142.00 (2010)

The articles of this volume will be reviewed individually.

Detailed reference viewed: 41 (1 UL)
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See detailXXth ISRA World Meeting 2012 at the University of Luxembourg. Abstract Book
Scientific Program Committee and Organization Committee; Melzer, André UL

Book published by Université du Luxembourg (2012)

Detailed reference viewed: 53 (2 UL)
See detailXXVIII Workshop on Geometrical Methods in Physics, Bialowieza, Poland, 28 June - 4 July 2009
Kielanowski, Piotr; Odzijewicz, Anatol; Schlichenmaier, Martin UL

Book published by AIP (2009)

Detailed reference viewed: 36 (3 UL)
See detailY wie Ybalon
Heimböckel, Dieter UL

Article for general public (2013)

Detailed reference viewed: 42 (0 UL)
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See detailYactul: An Extensible Game-Based Student Response Framework for Active Learning
Grevisse, Christian UL; Botev, Jean UL; Rothkugel, Steffen UL

in Ponencias del XVIII Encuentro Internacional Virtual Educa, Colombia 2017 (2017)

Student response systems as an active learning strategy have shown to be useful in different study domains. With the advent of gamification, these environments have become very popular to improve student ... [more ▼]

Student response systems as an active learning strategy have shown to be useful in different study domains. With the advent of gamification, these environments have become very popular to improve student engagement. However, existing solutions only provide a static set of activity types and limit their use to classrooms. In this paper, we present Yactul, an extensible game-based student response framework for active learning. Our ecosystem fosters continuous learning both in the collaborative setting of the classroom and the private study environment of the student. Our modular architecture enables a seamless integration of activities from a broad and extensible set. In addition, a mobile app for offline learning extends the experience outside the classroom and allows to replay quizzes anywhere and anytime, track the progress of an individual learner and suggest activities on topics that require more studying. [less ▲]

Detailed reference viewed: 237 (86 UL)
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See detailYale Symposium on Art and Gender
Penasse, Julien UL

Scientific Conference (2018, March 29)

Detailed reference viewed: 18 (1 UL)
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See detailYang-Mills fields and random holonomy along Brownian bridges
Arnaudon, Marc; Thalmaier, Anton UL

in Annals of Probability (2003), 31(2), 769-790

Detailed reference viewed: 156 (8 UL)
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See detailA year of monitoring 20 mesophilic full-scale bioreactors reveals the existence of stable but different core microbiomes in bio-waste and wastewater anaerobic digestion systems.
Calusinska, Magdalena; Goux, Xavier; Fossepre, Marie et al

in Biotechnology for biofuels (2018), 11

Background: Anaerobic digestion (AD) is a microbe-driven process of biomass decomposition to CH4 and CO2. In addition to renewable and cost-effective energy production, AD has emerged in the European ... [more ▼]

Background: Anaerobic digestion (AD) is a microbe-driven process of biomass decomposition to CH4 and CO2. In addition to renewable and cost-effective energy production, AD has emerged in the European Union as an environmentally friendly model of bio-waste valorisation and nutrient recycling. Nevertheless, due to the high diversity of uncharacterised microbes, a typical AD microbiome is still considered as "dark matter". Results: Using the high-throughput sequencing of small rRNA gene, and a monthly monitoring of the physicochemical parameters for 20 different mesophilic full-scale bioreactors over 1 year, we generated a detailed view of AD microbial ecology towards a better understanding of factors that influence and shape these communities. By studying the broadly distributed OTUs present in over 80% of analysed samples, we identified putatively important core bacteria and archaea to the AD process that accounted for over 70% of the whole microbial community relative abundances. AD reactors localised at the wastewater treatment plants were shown to operate with distinct core microbiomes than the agricultural and bio-waste treating biogas units. We also showed that both the core microbiomes were composed of low (with average community abundance </= 1%) and highly abundant microbial populations; the vast majority of which remains yet uncharacterised, e.g. abundant candidate Cloacimonetes. Using non-metric multidimensional scaling, we observed microorganisms grouping into clusters that well reflected the origin of the samples, e.g. wastewater versus agricultural and bio-waste treating biogas units. The calculated diversity patterns differed markedly between the different community clusters, mainly due to the presence of highly diverse and dynamic transient species. Core microbial communities appeared relatively stable over the monitoring period. Conclusions: In this study, we characterised microbial communities in different AD systems that were monitored over a 1-year period. Evidences were shown to support the concept of a core community driving the AD process, whereas the vast majority of dominant microorganisms remain yet to be characterised. [less ▲]

Detailed reference viewed: 43 (0 UL)
See detailYearbook of Idiographic Science 2010 Vol 3
Salvatore, S.; Valsiner, J.; Gennaro, A. et al

Book published by Firera & Liuzzo Publishing (2010)

Detailed reference viewed: 66 (1 UL)
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See detailYes and PI3K bind CD95 to signal invasion of glioblastoma.
Kleber, Susanne; Sancho-Martinez I; Wiestler B et al

in Cancer Cell (2008), 13

Invasion of surrounding brain tissue by isolated tumor cells represents one of the main obstacles to a curative therapy of glioblastoma multiforme. Here we unravel a mechanism regulating glioma ... [more ▼]

Invasion of surrounding brain tissue by isolated tumor cells represents one of the main obstacles to a curative therapy of glioblastoma multiforme. Here we unravel a mechanism regulating glioma infiltration. Tumor interaction with the surrounding brain tissue induces CD95 Ligand expression. Binding of CD95 Ligand to CD95 on glioblastoma cells recruits the Src family member Yes and the p85 subunit of phosphatidylinositol 3-kinase to CD95, which signal invasion via the glycogen synthase kinase 3-beta pathway and subsequent expression of matrix metalloproteinases. In a murine syngeneic model of intracranial GBM, neutralization of CD95 activity dramatically reduced the number of invading cells. Our results uncover CD95 as an activator of PI3K and, most importantly, as a crucial trigger of basal invasion of glioblastoma in vivo. [less ▲]

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See detailYes I can: The Role of self-efficacy in diabetes care
Recchia, Sophie; Steffgen, Georges UL; Spitz, Elisabeth

in Psychology & Health (2010), 25(1), 137-376

Based on the assumptions of social cognitive theory and self-regulation theory, the present study aimed at exploring psychosocial factors in self-care of diabetes (Edgar & Skinner, 2003; Iannotti et al ... [more ▼]

Based on the assumptions of social cognitive theory and self-regulation theory, the present study aimed at exploring psychosocial factors in self-care of diabetes (Edgar & Skinner, 2003; Iannotti et al., 2006; Nouwen et al., 2009). The study sample comprised N 1⁄4 99 patients with type 1 diabetes aged between 12 and 39 years. Participants completed the diabetes self-efficacy scale, the brief illness perceptions questionnaire, the WHO-five index and the summary of diabetes self-care activities scale. Results showed that illness perceptions (i.e. perceived consequences (r1⁄4􏰆0.28), personal control (r1⁄40.24), treatment control (r1⁄40.27), compre- hension (r1⁄40.27) and emotional response (r1⁄40.27)), as well as well-being (r1⁄40.42) and perceived diabetes self-efficacy (r 1⁄4 0.55) were significantly correlated with self-care. Furthermore, stepwise regression analyses elucidated self-efficacy (􏰈1⁄40.44) to be the most powerful predictor of self-care, as illness perceptions and well-being became non significant when introducing self-efficacy. Moreover, self-efficacy completely mediated the effect of well- being on self-care (Sobel t 1⁄4 3.74, p50.01). As for clinical implications of these results, it can be suggested that a stronger emphasise should be given on fostering patients’ confidence in their ability to effectively manage their diabetes. [less ▲]

Detailed reference viewed: 65 (2 UL)
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See detailYet another proof of the Nualart-Peccati criterion
Nourdin, Ivan UL

in Electronic Communications in Probability (2011), 16

Detailed reference viewed: 58 (1 UL)
See detailYoko Ono und die Macht der Kunst
Marmulla, Henning UL

Presentation (2014, March 25)

Detailed reference viewed: 24 (0 UL)
See detailYoko Ono und die Macht der Kunst. Gedanken zu einer Kunst der Irritation
Marmulla, Henning UL

in Gilcher-Holtey, Ingrid (Ed.) Eingreifende Denkerinnen. Weibliche Intellektuelle im 20. und 21. Jahrhundert (2015)

Detailed reference viewed: 74 (0 UL)