Search results for "Degrees"
showing 10 items of 234 documents
Translational dynamics effects on the non-local correlations between two atoms
2005
A pair of atoms interacting successively with the field of the same cavity and exchanging a single photon, leave the cavity in an entangled state of Einstein-Podolsky-Rosen (EPR) type (see, for example, [S.J.D. Phoenix, and S.M. Barnett, J. Mod. Opt. \textbf{40} (1993) 979]). By implementing the model with the translational degrees of freedom, we show in this letter that the entanglement with the translational atomic variables can lead, under appropriate conditions, towards the separability of the internal variables of the two atoms. This implies that the translational dynamics can lead, in some cases, to difficulties in observing the Bell's inequality violation for massive particles.
Robots that look like humans: A brief look into humanoid robotics
2018
This article provides a brief overview of the technology of humanoid robots. First, historical development and hardware progress are presented mainly on human-size full-body biped humanoid robots, together with progress in pattern generation of biped locomotion. Then, «whole-body motion» – coordinating leg and arm movements to fully leverage humanoids’ high degrees of freedom – is presented, followed by its applications in fields such as device evaluation and large-scale assembly. Upper-body humanoids with a mobile base, which are mainly utilized for research on human-robot interaction and cognitive robotics, are also introduced before addressing current issues and perspectives.
Une introduction à l'économie des faux diplomes
2008
International audience; This paper critiques the multifarious ways whereby academic qualifications may be falsified in the international marketplace. The objectives are fourfold : (1) defining the main terms used such as fake degrees and diploma mills ; (2) providing a brief history of fake degrees and identifying the factors that explain their recent development ; (3) developing a theoretical framework to analyze fake degrees ; and (4) exploring the costs and benefits of this activity and its net impact on a given society. Degrees serve instrumental and ceremonial purposes. It is argued that degree holders may be considered as members of a club. They confer to their holders excludable but …
Dipolar coupling of nanoparticle-molecule assemblies: An efficient approach for studying strong coupling
2021
Strong light-matter interactions facilitate not only emerging applications in quantum and non-linear optics but also modifications of materials properties. In particular the latter possibility has spurred the development of advanced theoretical techniques that can accurately capture both quantum optical and quantum chemical degrees of freedom. These methods are, however, computationally very demanding, which limits their application range. Here, we demonstrate that the optical spectra of nanoparticle-molecule assemblies, including strong coupling effects, can be predicted with good accuracy using a subsystem approach, in which the response functions of the different units are coupled only a…
Adiabatic Elimination and Sub-space Evolution of Open Quantum Systems
2020
Efficient descriptions of open quantum systems can be obtained by performing an adiabatic elimination of the fast degrees of freedom and formulating effective operators for the slow degrees of freedom in reduced dimensions. Here, we perform the construction of effective operators in frequency space, and using the final value theorem or alternatively the Keldysh theorem, we provide a correction for the trace of the density matrix which takes into account the non trace-preserving character of the evolution. We illustrate our results with two different systems, ones where the eliminated fast subspace is constituted by a continuous set of states and ones with discrete states. Furthermore, we sh…
Competition between inter- and intra- molecular energy exchanges in a simple quantum model of a dimer
2006
Abstract We propose a fully quantum model to describe the dynamics of a possible radiationless energy transfer process between identical and nearly localized molecules or monomers coupled through a dipole–dipole term. The system is studied as an environmentally isolated dimeric pair and we find that its dynamics exhibits a competition between the process ruling out the transfer of energy among different degrees of freedom of a given monomer and the one steering the intermolecular passage of excitations from a monomer to the other one. Such a competition is quantitatively characterized investigating on the temporal behaviour of quantum covariances of some couples of appropriate observables h…
Monte Carlo Simulation of a Modified Chi Distribution with Unequal Variances in the Generating Gaussians. A Discrete Methodology to Study Collective …
2020
The Chi distribution is a continuous probability distribution of a random variable obtained from the positive square root of the sum of k squared variables, each coming from a standard Normal distribution (mean = 0 and variance = 1). The variable k indicates the degrees of freedom. The usual expression for the Chi distribution can be generalised to include a parameter which is the variance (which can take any value) of the generating Gaussians. For instance, for k = 3, we have the case of the Maxwell-Boltzmann (MB) distribution of the particle velocities in the Ideal Gas model of Physics. In this work, we analyse the case of unequal variances in the generating Gaussians whose distribution w…
Fractional Derivatives in Interval Analysis
2017
In this paper, interval fractional derivatives are presented. We consider uncertainty in both the order and the argument of the fractional operator. The approach proposed takes advantage of the property of Fourier and Laplace transforms with respect to the translation operator, in order to first define integral transform of interval functions. Subsequently, the main interval fractional integrals and derivatives, such as the Riemann–Liouville, Caputo, and Riesz, are defined based on their properties with respect to integral transforms. Moreover, uncertain-but-bounded linear fractional dynamical systems, relevant in modeling fractional viscoelasticity, excited by zero-mean stationary Gaussian…
An introduction to the Economics of Fake Degrees
2008
08045; International audience; This paper critiques the multifarious ways whereby academic qualifications may be falsified in the international marketplace. The objectives are fourfold: (1) defining the main terms used such as fake degrees and diploma mills; (2) providing a brief history of fake degrees and identifying the factors that explain their recent development; (3) developing a theoretical framework to analyze fake degrees; and (4) exploring the costs and benefits of this activity and its net impacton a given society. Degrees serve instrumental and ceremonial purposes. It is argued that degree holders may be considered as members of a club. They confer totheir holders excludable but…
The choice of a foreign language as university degree: Expectations and traits of study
2017
The aim of this study is to report the degree which is most demanded by students in their final year of university and training Higher Level and to analyze the influence of parameters of gender, field of study, academic and professional interests and motives in the choosing a degree or qualification Foreign Language. This study involves a total of 1,162 students from Spain, with an age between 17 and 21 occurs years (M= 18.24 years, SD = 1.258). The main conclusions of this research is drawn that about one in ten are students who intend to study the three degrees of a foreign language is in the University (Grade of English Studies, Translation and Interpretation and Primary Mention Foreign …