RFID: A key technology for Humanity
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Yvan Duroc, Smail TedjiniAbstractThe RFID (Radio Frequency IDentification) technology is a well-known wireless application for traceability, logistics, and access control. It became ubiquitous in industry and our daily life (ticketing, payment, passports, car keys, etc.). RFID is nowadays a standardized technology; its inherent advantages, which are unitary, identification, wireless communication, and low cost of tags, provide it with decisive practical benefits that drive new developments in terms of concepts and ap...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Editorial Board
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): (Source: Comptes Rendus Physique)
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Drone-borne GPR design: Propagation issues
The objective is to see if a solution can be found in the near future.RésuméDans cet article, nous allons aborder les problèmes de propagation d'onde électromagnétique qui permettra de déterminer la faisabilité d'un capteur radar à pénétration de sol, embarqué sur un drone, destiné aux applications humanitaires, notamment dans le cadre des catastrophes. L'étude de la fréquence, de la polarisation, de la diffusion, de l'atténuation et de la dispersion des signaux radar pénétrant sous la surface permettra de déterminer l'applicabilité d'un capteur sur drone. La fonctionnalité du radar est donc évaluée e...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
From quantum physics to digital communication: Single sideband continuous phase modulation
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Haïfa Farès, D. Christian Glattli, Yves Louët, Jacques Palicot, Christophe Moy, Preden RoulleauAbstractIn the present paper, we propose a new frequency-shift keying continuous phase modulation (FSK–CPM) scheme having, by essence, the interesting feature of single-sideband (SSB) spectrum providing a very compact frequency occupation. First, the original principle, inspired from quantum physics (levitons), is presented. Besides, we address the problem of low-complexity coherent detection of this new waveform, base...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Editorial Board
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): (Source: Comptes Rendus Physique)
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Solar radio bursts as a tool for space weather forecasting
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Karl-Ludwig Klein, Carolina Salas Matamoros, Pietro ZuccaAbstractThe solar corona and its activity induce disturbances that may affect the space environment of the Earth. Noticeable disturbances come from coronal mass ejections (CMEs), which are large-scale ejections of plasma and magnetic fields from the solar corona, and solar energetic particles (SEPs). These particles are accelerated during the explosive variation of the coronal magnetic field or at the shock wave driven by a fast CME. In this contribution, it is...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Foreword
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Tullio Joseph Tanzi, Madhu Chandra (Source: Comptes Rendus Physique)
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Conforming discretizations of boundary element solutions to the electroencephalography forward problem
We report on the fact that several standardly used discretizations of these formulations are consistent only with an L2-framework, requiring the expansion term to be a square integrable function (i.e., in a Petrov–Galerkin scheme with expansion and testing functions). Instead, those techniques are not consistent when a more appropriate mapping in terms of fractional-order Sobolev spaces is considered. Such a mapping allows the expansion function term to be a less regular function, thus sensibly reducing the need for mesh refinements and low-precisions handling strategies that are currently required. These more favorable ...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
DEMETER observations of manmade waves that propagate in the ionosphere
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Michel ParrotAbstractThis paper is a review of manmade waves observed by the ionospheric satellite DEMETER. It concerns waves emitted by the ground-based VLF and ELF transmitters, by broadcasting stations, by the power line harmonic radiation, by industrial noise, and by active experiments. Examples are shown including, for the first time, the record of a wave coming from an ELF transmitter. These waves propagate upwards in the magnetosphere and they can be observed in the magnetically conjugated region of emission. ...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
The double Brewster angle effect
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): Laetitia Thirion-Lefevre, Régis Guinvarc'hAbstractThe Double Brewster angle effect (DBE) is an extension of the Brewster angle to double reflection on two orthogonal dielectric surfaces. It results from the combination of two pseudo-Brewster angles occurring in complementary incidence angles domains. It can be observed for a large range of incidence angles provided that double bounces mechanism is present. As a consequence of this effect, we show that the reflection coefficient at VV polarization can be at least 10 ...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Dossier Sommaire
Publication date: January–February 2018Source: Comptes Rendus Physique, Volume 19, Issues 1–2Author(s): (Source: Comptes Rendus Physique)
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
LED advances accelerate universal access to electric lighting
Publication date: March–April 2018Source: Comptes Rendus Physique, Volume 19, Issue 3Author(s): Peter Alstone, Arne JacobsonAbstractA rapid increase in the performance and quality of white LED light sources has changed the dynamics of electricity access in the last 10 years, reaching tens of millions of people with electric light who previously had no viable alternatives to fuel-based lighting, which is dangerous and expensive. Eliminating fuel-based lighting is a key public health, safety, social equality, and environmental opportunity that is now achievable. Technology advances in LEDs, other super-efficient appliances...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
LED-based white light
This article discusses the use of light-emitting diodes to generate white light – a research forefront in Physics and Ergonomics. We first present various technological approaches to white-light generation. After a general introduction to the human vision system, we discuss two key aspects of the quality of white light: the color of the light itself, and the color rendering of illuminated objects. We present the tools underlying modern color science, and review key color rendering metrics, from the well-known color rendering index to the latest improvements in the field.RésuméCet article présente l'utilisation des dio...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
LED lighting, ultra-low-power lighting schemes for new lighting applications
Publication date: March–April 2018Source: Comptes Rendus Physique, Volume 19, Issue 3Author(s): Marc FontoynontAbstractIn 2018, Solid-State Lighting (SSL) can totally outperform, if properly designed, most of other lighting products used for general lighting applications. This concerns various attributes such as luminous efficacy, life, spectral qualities, dimming potential, and more and more total cost of ownership. SSL can also mimic a large variety of reference light sources from candlelight to sunlight. The absence of international standards concerning LED modules remains the major difficulty for luminaire manufactur...
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
Editorial Board
Publication date: March–April 2018Source: Comptes Rendus Physique, Volume 19, Issue 3Author(s): (Source: Comptes Rendus Physique)
Source: Comptes Rendus Physique - July 11, 2018 Category: Physics Source Type: research
