1,052 research outputs found
Mauersegler weiter Wege. Mathias Enard: Kompass
No full textAnalysis of the peculiar scientific narrative in the novel of the Prix-Goncourt winning author Mathias Enard
Structure And Electronic Properties Of Ionized Pah Clusters
No full textPolycyclic aromatic hydrocarbon (PAH) clusters have been proposed as
candidates for evaporating very small grains that are revealed by their mid-IR
emission at the surface of UV-irradiated clouds in interstellar space\footnote{M.~Rapacioli,
C.~Joblin and P.~Boissel \textit{Astron. \& Astrophys.} \underline{\textbf{429}} (2005),
193-204.}. This suggestion is a motivation for further characterization of the properties of these clusters
in particular when they are ionized.
We have used a molecular beam coupled to the photoelectron-photoion coincidence spectrometer
DELICIOUS~II/~III \footnote{G.~Garcia, H.~Soldi-Lose and L.~Nahon \textit{Rev. Sci. Instrum.} \underline{\textbf{80}} (2009), 023102;
G.~Garcia, B.~Cunha de Miranda, M.~Tia, S.~Daly, L.~Nahon, \textit{Rev. Sci. Instrum.} \underline{\textbf{84}} (2013), 053112}
at the VUV beamline DESIRS of the synchrotron SOLEIL to characterize the electronic properties of cationic coronene
(CH) and pyrene (CH) clusters up to the pentamer and heptamer, respectively.
These experimental results are analysed in the light of electronic structure calculations. Simulations of the properties
of ionized PAH clusters are faced with the difficulty of describing charge delocalization in these large systems. We will show that recent developments combining
a Density Functional Tight Binding method with Configuration Interaction scheme\footnote{M.~Rapacioli, A.~ Simon,
L.~Dontot and F.~Spiegelman \textit{Phys. Status Solidi B} \underline{\textbf{249}} (2) (2012), 245-258;
L.~Dontot, M.~Rapacioli and F.~Spiegelman (2014) \textit{submitted} } is successful in simulating the ionization
potential, which gives strong confidence into the predicted structures for these PAH clusters.
We will also present current effort to study charge transfer states by performing complementary measurements with
the PIRENEA ion trap set-up.Made available in DSpace on 2014-09-17T16:56:04Z (GMT). No. of bitstreams: 3
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Previous issue date: 2014-06-1
Les commissions électorales en Afrique de l'Ouest
No full text[author: Mathias Hounkpe ; Ismaila Madior Fall]Electronic ed.: Abuja ; Bonn : FES, 201
Signataires "Il est temps de ne pas reprendre" _ 7
No full textListe des signataires de la tribune "Il est temps de ne pas reprendre" parue le 7 mai 2020 dans le quotidien Le Monde (plus de 3500 signataires). Début 1 2 3 4 5 6 7 8 9 ... Fin Nom Pays Fonction mathias Rapacioli France Chargé de recherche CNRS Fabienne BESSAC France Enseignant-chercheur Isabelle Danic France maître de conférences Thomas Nouvion France Adjoint Technique de Recherche et de Formation Laurent Rollet Frace Historien des sciences Noel Kram France Chomeur A..
Paul Bourget, écrivain engagé
No full textPaul Bourget, A committed writer, Yehoshua Mathias.
In the France of the early twentieth century, Paul Bourget's figure is that of a successful novelist who became gradually a «committed author». A monarchist, deeply conservative, passionate defender of religion and the family as the vital bases of the social order, he thus became the bard of the bourgeois ethic faced with the destabilization of modernity.Mathias Yehoshua. Paul Bourget, écrivain engagé. In: Vingtième Siècle, revue d'histoire, n°45, janvier-mars 1995. pp. 14-29
Modelling Interstellar Complex Molecules : Developments and Simulations
No full textLa formation et l'évolution des molécules complexes dans le milieu interstellaire est un sujet de recherche important pour mieux comprendre l'évolution physicochimiques dans ces environnements et, en particulier, les conditions d'apparition de la vie sur Terre. La glycine (NH2CH2COOH) est l'un des acides aminés les plus simples qui a été détecté dans la queue de deux comètes. D'autre part, les PAHs (hydrocarbures aromatiques polycycliques) sont des molécules omniprésentes dans le milieu interstellaire. Comprendre leurs évolutions sous l'effet de collisions avec des particules du rayonnement cosmique ou de vents stellaires est donc d'un grand intérêt. Ces molécules peuvent être étudiées isolées ou piégées dans les glaces interstellaires. Nous avons développé un schéma hybride de Mécanique Quantique (MQ) / Mécanique Moléculaire (MM) afin de traiter le grand nombre d'atomes et d'électrons impliqués. En outre, un schéma explicite de dynamique électronique, Real Time - Time Dependent - DFTB (RT-TD-DFTB), est développé pour simuler le dépôt d'énergie et la dynamique ultra-rapide de ces molécules soumis à l'irradiation des rayons cosmiques ou du vent stellaire. Les premières simulations de collisions d'ions avec la Glycine et des PAH sont présentées.Formation, distribution and behaviour of Complex Organic Molecules (COM's) in space is an important subject of research to the better understanding of the initial condition for the appearance of life on Earth. Furthermore, the study of high energy chemical processes in the interstellar medium (cosmic radiation's effect) and in solar system (solar wind's effect), is been of high interest. The aim of this work is to study astrophysical molecules trapped in interstellar ice systems under the effect of high energy radiation. These ices are characterised by being large systems, with large number of atoms. QM/MM hybrid method has become a very popular tool for molecular systems' simulations with a large number of atoms, appearing as a good compromise between accuracy and computational costs. We report the implementation of QM/MM hybrid method in the deMonNano software, using the Density Functional based Tight Binding (DFTB), an approximated DFT scheme, combined with Molecular Mechanic (MM) approach, namely Force Fields (FF) of class 1, such as OPLS-AA and AMBER-families of FFs. A complete implementation was performed using the QM/MM additive coupling scheme. In addition, the investigation of high energy chemical processes requires the explicit simulation of the electronic dynamics beyond the Born Oppenheimer approximation. As first step towards such dynamics, we will report the implementation of Real Time TD-DFTB in deMonNano, consisting in solving the Time-Dependent Schrödinger equation within the DFTB, where the electronic density matrix is propagated along time. We report a detailed introduction to new DFTB/MM and RT-TD-DFTB implementations as well as the complete study on glycine prebiotic molecule trapped in an interstellar ice. PAH interstellar systems will be also a matter of study
„Nature must be felt“ – Alexander von Humboldt, pioneer of an ecological worldview and protagonist of „transversal reason“
No full textDer Text erinnert zum 250sten Geburtsjahr an Alexander von Humboldt, ein Vordenker für eine ökologische Sicht der Welt und ein früher Protagonist „transversaler Vernunft“. Er ist als Ideengeber für die „neuen Naturtherapien“, für die Integrative Therapie und für eine ökologische Sicht in der Psychotherapie eine unverzichtbare Quelle. Einige aus dieser Perspektive wichtige Aspekte seines Denkens und Werkes werden aufgezeigt. Er ist ein Referenzautor für transversales und integratives Konzeptualisieren in unserer Zeit.The text commemorates the 250th year of birth of Alexander von Humboldt, a thought leader for an ecological view of the world and an early protagonist of „transversal reason“. He is an indispensable source of ideas for the „new nature therapies“, for integrative therapy and for an ecological viewpoint in psychotherapy. Some important aspects of his thinking and work are shown from this perspective. He is a reference author for transversal and integrative conceptualization in our time.https://www.fpi-publikation.de/gruene-texte/17-2019-petzold-h-g-mathias-wiedemann-u-natur-muss-gefuehlt-werden-alexander-v-humboldt/peerReviewedpublishedVersio
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