Search results for "THEORIE"
showing 10 items of 354 documents
Tunable invisibility cloaking by using isolated graphene-coated nanowires and dimers
2017
AbstractWe investigate, both theoretically and numerically, a graphene-coated nano-cylinder illuminated by a plane electromagnetic wave in the far-infrared range of frequencies. We have derived an analytical formula that enables fast evaluation of the spectral window with a substantial reduction in scattering efficiency for a sufficiently thin cylinder. This polarization-dependent effect leads to tunable resonant invisibility that can be achieved via modification of graphene chemical potential monitored by the gate voltage. A multi-frequency cloaking mechanism based on dimer coated nanowires is also discussed in detail.
Splitting of the surface phonon modes in wurtzite nanowires
2013
We analyze the surface optical modes of GaN nanowires (NW) and perform a comparative study with the characteristics expected for other polar NWs. The theoretical analysis of the modes is performed within the context of the effective medium theory that takes into account the dipolar interaction between neighboring NWs (Maxwell-Garnett approximation). It is shown that deviations of the exciting light from the NWs axis, which coincides with the wurtzite c-axis, result in the anticrossing of two distinct surface phonon branches, leading to their splitting in axial and planar components and the appearance of two peaks in the Raman spectra. Additional calculations are performed that determine th…
Medium | Format. Einleitung in den Schwerpunkt
2020
Le relazioni tra utente ed informazioni. Principi e metodi di analisi
2016
Presentación de los estudios sobre comportamiento informacional desde el punto de vista de: a) conceptos y evolución histórica, b) fundamentos teóricos y c) fundamentos metodológicos. Overview of studies on information behavior from the point of view of: a) concepts and historical evolution, b) theorical and c) methodological foundations.
IMPLICIT THEORIES OF INTELLIGENCE AND ACADEMIC ACHIEVEMENT: REVIEW OF TWO STUDIES IN LATVIA
2020
Growth mindset has become popular in the field of psychology and education all around the world. In the Baltic States this concept is relatively new. This research compiles results of two different studies that, for the first time in the Baltic States, analyse the concept of “implicit theories of intelligence” (ITI) and its factors – growth and fixed mindset, and investigate the relations between ITI and academic achievement of students. Data of two different samples of secondary school adolescents is used. Sample 1 consisted of students (N1=258) aged between 14 and 18, 134 females (M=15.13; SD=1.29) and 124 males (M=15.40; SD=1.20) studying in 7th-12th grade in two Latvian schools. Sample …
La Méthode como hermenéutica musical Homenaje a Edgar Morin por su 100º cumpleaños
2021
The present work addresses the principles and properties of the complex thought formulated by the French thinker Edgar Morin and the way in which he was able me to articulate his conception of organizational complexity with one of the most important theories of musical analysis, which emerged at the beginning of the 20th century: the schenkerian analysis. It is a review and extension of a few pages of my doctoral thesis, which are intended to pay tribute to who has been, in addition to my teacher, Honorary President of Itamar since its first issue. His teachings and support has always been the engine for my quest for musical organization. On July 21, 2021, Morin celebrated his 100th birthda…
Forecasting container transshipment in Germany
2009
International audience; In this paper, we examine container transshipment at German ports using the seasonal ARIMA (SARIMA) model and the Holt-Winters exponential smoothing approach. Our models are designed especially to take account of the seasonal behavior of the quarterly data used. We consider the dynamic development in this sector for the whole container throughput and also the destinations Asia, Europe and North America, which are the world's three main economic regions. Our data runs from the first quarter of 1989 to the fourth quarter of 2006. We provide detailed quarterly forecasts for the year 2007 and 2008. According to forecasting error measures such as Mean Square Error and The…
Cooperation and cultural transmission in a coordination game
2009
Abstract The aim of this paper is to analyze if cooperation can be the product of cultural evolution in a two-stage coordination game, consisting of a production stage followed by a negotiation phase. We present an overlapping generations model with cultural transmission of preferences where the distribution of preferences in the population and the strategies are determined endogenously and simultaneously. There are several groups in the society; some of them play cooperatively and others do not. Socialization takes place inside the group, but there is a positive rate of migration among groups which parents anticipate. Our main result shows that all groups converge to the cooperative equili…
New Physics adventures in the LHC age
2017
La física de partículas está viviendo actualmente una era de exploración que comenzó con la observación en el LHC del bosón de Higgs, proporcionando así al Modelo Estándar de la Física de Partículas la elusiva pieza final que lo completa. Si bien esta teoría es extremadamente exitosa, se acepta comúnmente que no es la teoría final ya que no puede responder a todas las preguntas teóricas ni a ciertas observaciones experimentales. Por lo tanto, se espera que Nueva Física que extienda al Modelo Estándar aparezca pronto, aunque esto bien podría ser sólo una esperanza. Esta tesis recoge algunas de las aventuras en la búsqueda de Nueva Física. Se organiza en tres partes: la Parte I introduce, en …
Integration of an LP Solver into Interval Constraint Propagation
2011
This paper describes the integration of an LP solver into iSAT, a Satisfiability Modulo Theories solver that can solve Boolean combinations of linear and nonlinear constraints. iSAT is a tight integration of the well-known DPLL algorithm and interval constraint propagation allowing it to reason about linear and nonlinear constraints. As interval arithmetic is known to be less efficient on solving linear programs, we will demonstrate how the integration of an LP solver can improve the overall solving performance of iSAT.