342 research outputs found
Data of Micromechanics-based material networks revisited from the interaction viewpoint; robust and efficient implementation for multi-phase composites
No full textData related to the publication (we would be grateful if you could cite the paper in the case in which you are using the data)
title = "Micromechanics-based material networks revisited from the interaction viewpoint; robust and efficient implementation for multi-phase composites",
journal = "European Journal of Mechanics - A/Solids",
year = "2022",
volume = "91",
pages = " 104384 ",
doi = "https://doi.org/10.1016/j.euromechsol.2021.104384",
author = "Nguyen, Van Dung and Noels, Ludovic"Van Dung Nguyen is a Postdoctoral Researcher at the Belgian National Fund for Scientific Research (FNRS
Ludovic-Mohamed Zahed’s Universal Performance of French Citizenship and Muslim Brotherhood
No full textIn this chapter, I present the life and work of Ludovic-Mohamed Zahed, who is the founder of three non-profit associations over the past several years: Les Enfants du Sida (2006), Homosexuels musulmans de France (HM2F) (2010), and Musulman-es Progressistes de France (2012). He is also the author of Révoltes extraordinaires: un enfant du sida autour du monde (2011) and Le Coran et La Chair (2012), and co-author of Queer Muslim Marriage (2013). During the last few years, the French media have covered his same-sex marriage in Cape Town to husband Qiyaam Jantjies-Zahed in 2011, the publication of his book, Le Coran et La Chair in 2012, as well as and his creation of La Mosquée inclusive de l’Unicité, the first “gay friendly” or inclusive mosque in Paris, in 2012.</p
Synthèse d'émetteurs chiraux TADF pour des applications en OLED à électroluminescence circulairement polarisée
No full textLes composés chiraux peuvent émettre spontanément une lumière polarisée circulairement (CP), de signe opposé (luminescence CP gauche ou droite, CPL) pour les deux énantiomères. Ces caractéristiques spécifiques ont rendu les émetteurs chiraux particulièrement attrayants pour le développement de diodes électroluminescentes organiques (OLED) à électroluminescence polarisée circulairement (CP-OLED), qui sont récemment apparues comme une approche intéressante pour améliorer les performances des écrans par rapport aux OLED non polarisées actuellement utilisées. Les émetteurs CP à fluorescence retardée activée thermiquement (TADF) ont récemment attiré une attention particulière en raison de la possibilité de convertir simultanément les excitons singulet et triplet en émission de lumière polarisée circulairement et d'atteindre une efficacité élevée des dispositifs. Cette thèse a permis de développer des émetteurs chiraux TADF innovants basés sur le système bicarbazole de symétrie C2 selon les deux stratégies suivantes: i) système à transfert de charge intramoléculaire (ICT) ; cette stratégie conduit à des émetteurs TADF efficaces à chiralité inhérente avec des facteurs de dissymétrie glum atteignant 2x10-3et ii) système à transfert de charge à l'état excité intermoléculaire (Exciplexe) avec une séparation marquée entre la HOMO (donneur) et la LUMO (unités acceptrices), démontrant des glum allant jusqu'à 1x10-2 en s'inspirant du potentiel de la chimie supramoléculaire à obtenir un ordre de grandeur supérieur en terme d’organisation chirale. De manière intéressante, ce type d’approche à l’échelle covalente a également donné lieu à un contrôle innovant du signe de CPL en fonction de la polarité des solvants utilisés, provenant de conformères et de structures électroniques différents.The development of organic light emitting diodes (OLEDs) with CP electroluminescence (CP-OLEDs) has recently emerged as an interesting approach to improve displays performances in comparison to currently used unpolarized OLEDs. CP-emitters with thermally activated delayed fluorescence (TADF) have recently attracted significant attention owing to the possibility to simultaneously convert both singlet and triplet excitons to circularly polarized light emission and reach high devices efficiency. This thesis enabled to develop innovative chiral TADF emitters based on C2-symmetrical bicarbazole system along two strategies: i) intramolecular charge transfer (ICT) system; This thesis enabled to develop innovative chiral TADF emitters based on C2-symmetrical bicarbazole system along two strategies: i) intramolecular charge transfer (ICT) system; this strategy leads to efficient inherent chiral TADF emitters with dissymmetry factors glum of up to 2x10-3 and ii) intermolecular excited state charge transfer (Exciplex) with an efficient separation of HOMO (donor) and LUMO (acceptor units) displaying dissymmetry factors glum reaching 1x10-2, inspired by supramolecular arrangement which enables high order of chiral organization. Interestingly, such approach using a covalent model has also afforded an innovating control of CPL sign in solvents with different polarities, originating from different conformers and electronic structures
Ex Post and Ex Ante Coordination: Principles of Coherence in Organizations and Markets
No full textIn the traditional trade-off between internalization and externalization, economists tend to undervalue the role of intentionality (Williamson 1991) and to accord a dominant place to market coordinating devices (ex post coordination) compared to hierarchical coordinating devices (ex ante coordination). The aim of this paper is to show how the introduction of the concept of coherence, which is frequently invoked by economists in order to apprehend the firm specificities (Holmstrom 1999), may help to revaluate the trade-off between markets and firms in the advantage of the later. In particular, it will be shown that the attributes of coherence in ex post coordinating devices are fundamentally different from the ones that can be found in ex ante coordination systems.coherence; ex post coordination; ex ante coordination; order; rules; abstract rules; concrete rules; Hayek; Bateson
Les defis du developpement local au Senegal
No full textThis book is an uncompromising analysis of Senegal's decentralisation policy in rural areas. It discusses the state's inability to promote local development, despite this being its main raison d'?tre in a context of poverty. To identify reasons for the shortcomings, the author goes beyond policy statements and explores, sociologically, the compatibility of the behaviour and the cultural context of actors with the pursuance of local development objectives. Yet, there are indeed solutions to the actors' lethargy and to the weak coverage of the initiatives undertaken. The solutions can be found in the methodical and civic mobilisation around more ambitious actions that are more adapted to receptive localities, though opened to modernity and perfectly anchored in the culture for positive results. Rosnert Ludovic Alissoutin holds a PhD in Law. Since 1995, he has been working as a consultant on development issues in Senegal and Africa, particularly local development issues. The particularity of his approach lies in the rejection of scientific exclusivism and recourse to a multi disciplinary, open and flexible analysis of the complexity of human development. It is this perspective that informed his doctoral thesis on La Gestion de l'eau en milieu aride, which discusses legal, anthropological, geographical, and sociological issues. For additional information on his profile and work, visit his website: http://www.ralissoutin.com
Les Amérindiens wayana et la mise en place du projet de Parc national guyanais
No full textThis article sums up the history of the project for a National Park in French Guiana and examines some of the most recent attempts to resolve the Amerindian territorial issue. Insofar as conservationist practice in Amazonia is founded on the premise that the Amerindians share the same heritage-preserving relationship to nature, the article reviews the animist foundations of these relationships. Furthermore Wayana society has already undergone major socioeconomic changes, which the author has attempted to relate to those likely to arise when the new national park is established.Cet article récapitule l'historique du projet de Parc national du sud de la Guyane et s'attarde sur quelques unes des tentatives les plus récentes pour résoudre la question territoriale amérindienne. Dans la mesure où la pratique conservationniste en Amazonie s'appuie sur le postulat que les Amérindiens partageraient avec elle un même rapport patrimonial à la nature, les fondements animistes de ces rapports sont réexaminés. La société wayana étant traversée par de nombreux bouleversements socio-économiques, certains d'entre eux sont ensuite reliés à ceux que l'on peut attendre de la mise en place future du parc.Leprêtre Ludovic. Les Amérindiens wayana et la mise en place du projet de Parc national guyanais. In: Journal d'agriculture traditionnelle et de botanique appliquée, 40ᵉ année, bulletin n°1-2,1998. Conserver, gérer la biodiversité : quelle stratégie pour la Guyane ? sous la direction de Marie Fleury et Odile Poncy. pp. 559-576
Data and Software of "Development of a Geometric Modeling Strategy for the Generation of Representative Unit Cells in 2D Braids"
No full text<h1><strong>Id: Data of following publication</strong></h1>
<p>title = "Development of a Geometric Modeling Strategy for the Generation of Representative Unit Cells in 2D Braids",<br>journal = "",<br>pages = "",<br>year = "",<br>issn = "",<br>doi = "",<br>author = "José Rothkegel, Benjamin Renson, Michael Bruyneel, Ludovic Noels"</p>
<p>Data doi on 10.5281/zenodo.10829042</p>
<h1>pyRVE</h1>
<h2><a href="#python-code-for-geometrical-generator-for-braided-composites-rve"></a><em>Python Code for Geometrical Generator for Braided Composites RVE</em></h2>
<p>pyRVE is a code written in <em>Python</em> using the <em>GMSH API</em> that generates the Representative Unit Cell (RUC) of braided composites. It allows the generation of the RUC of triaxial braided for <em>Diamond</em> and <em>Regular</em> patterns.</p>
<h2><a href="#requirements"></a>Requirements</h2>
<p>To run, it requires:</p>
<ul>
<li>The GMSH Python API, which must be built with OpenCascade support.
<ul>
<li>Choose a local installation directory; <code>CMAKE_INSTALL_PREFIX=HOME/local/gmsh</code>, and <code>GMSHPY_INSTALL_DIRECTORY=HOME/local/gmsh</code> e.g.;</li>
<li>Make that directory part of your <code>export PYTHONPATH=PYTHONPATH</code>.</li>
<li>After compiling use <code>make install</code>.</li>
</ul>
</li>
<li>The CM3 app dG3D if the final RVE homogenized solution is needed (<a href="https://gitlab.onelab.info/cm3/cm3Libraries">https://gitlab.onelab.info/cm3/cm3Libraries</a>).</li>
<li>Make sure that the latest version of OpenCascade (OCCT) is used. Current used version in occt-V7.8.0.</li>
</ul>
<h2><a href="#usage"></a>Usage</h2>
<h3><a href="#file-structure"></a>File Structure</h3>
<p>A typical run case must have a file structure, where:</p>
<ul>
<li><code>brd</code>: the files <code>.brd</code> and <code>.brep</code> are located here. The <code>.brd</code> is a backup of the <code>braidClass</code> instance used in the model saved using <code>pickle</code>, the <code>.brep</code> is the Boundary Representation file that can be opened with <em>GMSH</em>.</li>
<li><code>csv</code>: the <code>.csv</code> file saved here is the initial output of the code. It contains the actually used dimensions and the final cover factor of the braid.</li>
<li><code>data</code>: It contains <code>.csv</code> files with the material properties and the dimensions of the tows. The original model dimensions are read from here.</li>
<li><code>dir</code>: In the case of running the RVE homogenization, the directions of the tow fibers are stored here. They are saved for post processing.</li>
<li><code>msh</code>: the mesh file <code>.msh</code> obtained after the geometry geneartion is stores here.</li>
<li><code>png</code>: in the case of automatic post processing, png files are stored here.</li>
<li><code>res</code>: this folder is used to store the homogenization results. They have to be moved here.</li>
<li><code>stp</code>: if acitvated, a <code>.stp</code> file of the geometry is stored here</li>
<li><code>svg</code>: the projection of the geometry on the <em>x-y</em> plane is stored here.</li>
<li><code>vtk</code>: A copy of the mesh file without the matrix mesh is sotred here as a `.vtk`` file.</li>
</ul>
<h3><a href="#how-to-run"></a>How to Run</h3>
<p>We will consider the current file structure to run the example in 000_Base. To run the code, it can be called from the command prompt as</p>
<div>
<pre><code>python3 ../../source/mainRVE.py --name <i> --pattern <pattern></code></pre>
</div>
<p>In this case, the <code>--name</code> refers to the index that will be given to the model, where <code><i></code> must be changed to an integer and <code>--pattern</code> refers to the wanted pattern to be used, where <code><pattern></code> must be changed to either <code>dia</code> or <code>reg</code>.</p>
<blockquote>
<p>Note: <code><code>--name</code>cat</code> can also be used to reproduce the regular pattern benchmark of the paper. In that case, the volume fraction of fiber in the tows is hard coded as the provided value in the reference (i.e. 0.86). For other cases, the volume fraction is evaluated from the tow cross-sections.</p>
<p>Note: <code>mainRVE.py</code> must be accesible from the directory where the case is being run. This example shows the usage of the current file structure.</p>
</blockquote>
<h3><a href="#all-command-line-options"></a>All Command Line Options</h3>
<p>The code can be run using further options that serve different purpouses, some serving pre processing needs and other serving run administration. The different command line options are:</p>
<ul>
<li>Required:
<ul>
<li><code>--name</code> : it gives a suffix to the run model. It is usually an integer.</li>
<li><code>--pattern</code> : indicates the type of pattern to be used to build the geometry. The two current options are <code>dia</code> for diamond and <code>reg</code> for regular.</li>
</ul>
</li>
<li>Optional
<ul>
<li><code>-dG3D</code>: it indicates that the homogenization of the generated RUC is to be perfomed.</li>
<li><code>-GMSH</code> : it indicates that GMSH must be open upon competion of the generation of the mesh.</li>
<li><code>-loadModel</code> : it will try to load a premade model. It will ignore <code>--pattern</code>.</li>
<li><code>--rndPrm</code> : it will generate randomized geometrical parameters. It can be used to generate batches of results. It takes an argument that can be <code>2</code>, <code>4</code> or <code>6</code>. Currently, <code>2</code> gives a random value for <code>s_axial</code> and <code>theta</code>, <code>4</code> randomizes the same as <code>2</code> and adds <code>h_axial</code> and <code>h_bias</code>, and <code>6</code> randomizes the same as <code>4</code> and adds <code>w_axial</code> and <code>w_bias</code>.</li>
</ul>
</li>
<li>Pre-Processing
<ul>
<li><code>-refCF</code>: it tells the code to generate a grid of values for <code>s_axial</code> and <code>theta</code> where only the cover factor is obtained. It is meant for posterior graphing purposes.</li>
</ul>
</li>
</ul>
<h3><a href="#examples"></a>Examples</h3>
<p>Following the run options, a few examples are indicated</p>
<ul>
<li>A basic mesh generation run for the basic data, considering a <strong>regular pattern</strong>, for a model named <strong>2</strong>:</li>
</ul>
<div>
<pre><code>python3 ../../source/mainRVE.py --name 2 --pattern reg</code></pre>
</div>
<ul>
<li>The generation of the cover factor data and export, considering a <strong>regular pattern</strong>:</li>
</ul>
<div>
<pre><code>python3 ../../source/mainRVE.py --pattern reg -refCF</code></pre>
</div>
<ul>
<li>A run for the modified basic data, where the <strong>2</strong> parameters are modified <em>randomly</em>, considering a <strong>regular pattern</strong>, for a model named <strong>2</strong>:</li>
</ul>
<div>
<pre><code>python3 ../../source/mainRVE.py --name 2 --pattern reg --rndPrm 2</code></pre>
</div>
<ul>
<li>A run, where model <strong>2</strong> already exists in <code>brd</code> folder but not the <code>.msh</code> and <code>.vtk</code> files:</li>
</ul>
<div>
<pre><code>python3 ../../source/mainRVE.py --name 2 -loadModel </code></pre>
</div>
<h2><a href="#code-structure"></a>Code Structure</h2>
<p>The code is implemented into Python files, where <code>mainRVE.py</code> runs the whole code. The files are:</p>
<ul>
<li>Braid:
<ul>
<li><code>braidClass.py</code> :</li>
<li><code>bzrPairClass.py</code> :</li>
</ul>
</li>
<li>Geometry
<ul>
<li><code>bezrClass.py</code> :</li>
<li><code>bilnClass.py</code> :</li>
<li><code>patchClass.py</code> :</li>
<li><code>pntSetClass.py</code> :</li>
<li><code>pointClass.py</code> :</li>
<li><code>sctnClass.py</code> :</li>
<li><code>stripeClass.py</code> :</li>
<li><code>surfClass.py</code> :</li>
<li><code>surfOffClass.py</code> :</li>
</ul>
</li>
<li>Material:
<ul>
<li><code>chamis.py</code> :</li>
</ul>
</li>
<li>Tools:
<ul>
<li><code>dataIO.py</code> :</li>
<li><code>postDirection.py</code> :</li>
<li><code>tool.py</code> :</li>
<li><code>toolData.py</code> :</li>
</ul>
</li>
<li><code>curveClass.py</code> :*</li>
</ul>
<p> </p>
<p> </p>
Persistent Organic Room-Temperature Phosphorescence in Cyclohexane-Trans-1,2-Bisphthalimide Derivatives: The Dramatic Impact of Heterochiral vs. Homochiral Interactions
No full textPersistent metal-free Room-Temperature Phosphorescence (RTP) materials attract significant interest owing to the production of long-lived triplet excited states. Although several organic designs show RTP, the impact of intermolecular interactions on the triplet excitons stabilization and migrations remains hardly understood because obtaining different ordered intermolecular interactions while conserving identical molecular electronic properties is very challenging. We propose here a new strategy to circumvent this problem by taking advantage of the distinct molecular packing that can be found between enantiomer and racemic forms of a chiral molecule. Structural, photophysical and chiroptical investigations of chiral cyclohexane bisphthalimide derivatives showed that heterochiral and homochiral dimer interactions play a crucial role on the triplet excited state stabilization, resulting in higher RTP efficiency for enantiopure systems than for racemic one. This study paves the way to the use of molecular chirality to rationalize supramolecular properties arising from subtle intermolecular interactions.<br /
Learning Dynamic Author Representations with Temporal Language Models
No full textInternational audienceLanguage models are at the heart of numerous works, notably in the text mining and information retrieval communities. These statistical models aim at extracting word distributions, from simple unigram models to recurrent approaches with latent variables that capture subtle dependencies in texts. However, those models are learned from word sequences only, and authors' identities, as well as publication dates, are seldom considered. We propose a neural model, based on recurrent language modeling, which aims at capturing language diffusion tendencies in author communities through time. By conditioning language models with author and temporal vector states, we are able to leverage the latent dependencies between the text contexts. This allows us to beat several temporal and non-temporal language baselines on two real-world corpora, and to learn meaningful author representations that vary through time
Data of "Ductile fracture of high entropy alloys: from the design of an experimental campaign to the development of a micromechanics-based modeling framework"
No full textData related to the publication (we would be grateful if you could cite the paper in the case in which you are using the data):
title = "Ductile fracture of high entropy alloys: from the design of an experimental campaign to the development of a micromechanics-based modeling framework",
journal = "Engineering Fracture Mechanics",
year = "2022",
volume = "275",
pages = "108844 ",
doi = "https://doi.org/10.1016/j.engfracmech.2022.108844",
author = "Antoine Hilhorst, Julien Leclerc, Thomas Pardoen, Pascal J. Jacques, Ludovic Noels, Van-Dung Nguyen"
New version following review.The research has been funded by the Walloon Region under the agreement no. 1610154-EntroTough in
the context of the 2016 WalInnov call
- …
