Search results for "06"
showing 10 items of 26305 documents
Discrete spectral incoherent solitons in nonlinear media with noninstantaneous response
2011
International audience; We show theoretically that nonlinear optical media characterized by a finite response time may support the existence of discrete spectral incoherent solitons. The structure of the soliton consists of three incoherent spectral bands that propagate in frequency space toward the low-frequency components in a discrete fashion and with a constant velocity. Discrete spectral incoherent solitons do not exhibit a confinement in the space-time domain, but exclusively in the frequency domain. The kinetic theory describes in detail all the essential properties of discrete spectral incoherent solitons: A quantitative agreement has been obtained between simulations of the kinetic…
Abstracts from the CECAM workshop on computer simulations of cellular automata
1989
Anwendung der elliptischen Funktionen auf Probleme der Elektrostatik
1949
Vorausgesetzt wird im folgenden eine Verteilung des elektrostatischen Feldes, die von einer der drei rechtwinkligen Koordinaten x, y, z, beispielsweise von z unabhangig ist. Das heist alle vorhandenen Leiter sind unendlich lange Zylinder beliebigen Querschnitts, deren Mantellinien parallel der z-Achse gerichtet sind. Es genugt daher den Feldverlauf in der xy-Ebene zu untersuchen. Unter dieser Voraussetzung lautet die Differentialgleichung fur das elektrostatische Potential φ =φ (x, y) XXX
Adjacency matrices of random digraphs: singularity and anti-concentration
2017
Let ${\mathcal D}_{n,d}$ be the set of all $d$-regular directed graphs on $n$ vertices. Let $G$ be a graph chosen uniformly at random from ${\mathcal D}_{n,d}$ and $M$ be its adjacency matrix. We show that $M$ is invertible with probability at least $1-C\ln^{3} d/\sqrt{d}$ for $C\leq d\leq cn/\ln^2 n$, where $c, C$ are positive absolute constants. To this end, we establish a few properties of $d$-regular directed graphs. One of them, a Littlewood-Offord type anti-concentration property, is of independent interest. Let $J$ be a subset of vertices of $G$ with $|J|\approx n/d$. Let $\delta_i$ be the indicator of the event that the vertex $i$ is connected to $J$ and define $\delta = (\delta_1, …
Многофазные решения нелокальных симметричных редукций уравнений иерархии АКНС: общий анализ и простейшие примеры
2020
Рассмотрены нелокальные симметрии, которыми обладают все или все четные (все нечетные) уравнения из иерархии АКНС. Построены примеры решений, удовлетворяющих одновременно нескольким нелокальным уравнениям из иерархии АКНС. Проведено подробное исследование однофазных решений.
Anwendungen in Hydro- und Aerodynamik
1949
Wie in der Theorie der Hydrodynamik gezeigt wird, konnen die Geschwindigkeitskomponenten der stationaren Stromung einer reibungslosen inkompressiblen Flussigkeit durch Differentiation einer der Laplaceschen Differentialgleichung genugenden Ortsfunktion u (des Geschwindigkeitspotentials) nach den Koordinaten des Aufpunktes erhalten werden. Ist insbesondere die Stromung zweidimensional, d. h. z. B. nur von den rechtwinkligen Koordinaten x und y abhangig, so stellt die zum Geschwindigkeitspotential u (x, y) konjugierte Funktion v (x, y) die sogenannte Stromfunktion dar. Die Kurven u (x, y) = konstant stellen die Niveaulinien, diejenigen v (x, y) = konstant die Stromlinien der betrachteten Stro…
Collisions moléculaires en phase gazeuse
2019
L’étude théorique des collisions entre atomes et molécules permet, grâce à la résolution d’état à état des simulations numériques basées sur la physique quantique, une description détaillée des mécanismes mis en jeu et contribue grandement à améliorer les modèles atmosphériques et astrophysiques. Dans cet article, après avoir présenté les méthodes de dynamique actuelles, nous donnons des exemples clés d’intérêt pour le milieu interstellaire, l’atmosphère terrestre et les milieux (ultra)froids, et présentons les défis majeurs à relever.
Analysis of the specific common competences of the Degree Courses in Speech Therapy and on the ability to apply in the didactic systems
2020
Law 11 January 2018 n. 3 places the attention of the Health Professions on the specific common skills, which must be evident in the didactic systems to protect the Profession. The purpose of this work is to identify which skills are always present among the training objectives of the Degree Courses in Speech Therapy, and which instead become "specific" for our profession. The data analysis was conducted on 27 Degree Courses in Speech Therapy present in Italy, using the portal "Universitaly" and evaluating the SUA cards of the various Degree Courses. The analysis of the data revealed that: basic skills were insufficient for the areas of labor law and corporate organization; transversal skill…
First principles hybrid Hartree-Fock-DFT calculations of bulk and (001) surface F centers in oxide perovskites and alkaline-earth fluorides
2020
Valuable discussions with E. A. Kotomin are gratefully acknowledged. Research contribution of R. E. and A. I. P. has been performed within the framework of the EUROfusion Enabling Research project: ENR-MFE19.ISSP-UL-02 “Advanced experimental and theoretical analysis of defect evolution and structural disordering in optical and dielectric materials for fusion applications.” The views and opinions expressed herein do not necessarily reflect those of the European Commission.