A5091654588- Scientific Measurement and Uncertainty Evaluation
- Radioactive Decay and Measurement Techniques
- Advanced Sensor Technologies Research
- Karst Systems and Hydrogeology
- Health, Medicine and Society
- Geology and Paleoclimatology Research
- Music Therapy and Health
- Advanced Measurement and Metrology Techniques
- Water management and technologies
- Nutrition, Health, and Society Studies
- Mechanical Behavior of Composites
- Sensor Technology and Measurement Systems
- Composite Material Mechanics
- Landslides and related hazards
- Psychoanalysis and Psychopathology Research
- Geological and Geophysical Studies Worldwide
- Neurology and Historical Studies
- Mechatronics Education and Applications
- Multiculturalism, Politics, Migration, Gender
- Education, sociology, and vocational training
- Fire dynamics and safety research
- Neuroscience and Music Perception
- Advanced MEMS and NEMS Technologies
- Plant and animal studies
- Geotourism and Geoheritage Conservation
Laboratoire National de Métrologie et d'Essais
2012-2024
Institut Polytechnique des Sciences Avancées
2020-2023
HEMU - Haute École de Musique
2019-2021
University of Lausanne
2021
HES-SO University of Applied Sciences and Arts Western Switzerland
2019
Fédération française de cardiologie
2017
Conservatoire National des Arts et Métiers
2015
Airbus (France)
2008-2015
STMicroelectronics (Czechia)
2014
GFZ Helmholtz Centre for Geosciences
2014
A determination of the Planck constant h using LNE Kibble balance in air was carried out spring 2017. Substantial improvements since 2014, chiefly related to mass standard, mechanical alignments, voltage measurements and type evaluation uncertainties, leads a value 6.626 070 41(38) × 10–34 J · s, with relative standard uncertainty 5.7 10–8.
A versatile fire test has been developed with a complete set of instrumentation to investigate the behaviour carbon fibre epoxy composite designed for aircraft. During single test, both condensed and gas phases can be simultaneously studied measuring temperature profile mass loss studying nature quantity volatile gaseous species. This novel bench is compliant two aeronautical certification tests: ISO2685:1998(E) FAR25.856(b):2003. Titanium coupons have first submitted validate testing...
After separate developments of the different elements with continuous characterizations and improvements, LNE watt balance has been assembled. This paper describes system in detail gives its first measurements Planck's constant h. The value determined air is h = 6.626 068 8(20) × 10−34 Js which differs relative terms by −0.05 10−7 from h90 −1.1 that 2010 CODATA adjustment standard uncertainty associated 3.1 10−7.
Main text This report describes the second CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances x-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus serves as basis an internationally coordinated dissemination is updated after each new comparison. Its use will continue...
Modern wireless communication systems, such as high-speed uplink packet access (HSUPA) or long term evolution (LTE), employ highly spectral-efficient modulations with inherent non-constant envelope signals having high peak-to-average power ratio (PAPR). These require the RF Power Amplifiers (PAs) to be backed off from saturation satisfy stringent linearity requirements. Unfortunately, linear operation leads very low overall system efficiency. The tracking (ET) technique has been identified...
The definition of the kilogram in International System Units (SI) is expected to be revised 2018. present kilogram, mass Prototype Kilogram (IPK), adopted 1889, would then replaced by a based on fixed numerical value Planck constant. Consultative Committee for Mass and Related Quantities has requested that, as one essential steps before redefinition, comparison realizations future realization methods, Kibble9 balances x-ray crystal density (XRCD) experiments, organized.
Alignments of watt balance experiments are necessary to achieve a relative uncertainty at level few parts in 108. This paper briefly describes the LNE and concentrates on adjustments made minimize coil movements during weighing mode. The parasitic forces torques involved these estimated by mathematical model. Some calculated compared with an evaluation done studying yaw movement beam.
This paper presents a new Python software for the parametric design of stabilizing feedback laws with time delays, called Partial Pole Placement via Delay Action (P3δ). After an introduction recalling recent theoretical results on multiplicity-induced-dominancy (MID) and coexisting real roots-induced-dominancy (CRRID) properties their use stabilization control systems operating under current version P3δ, which relies MID property to compute delayed scalar differential equations single delay....
The low weight and packaged volume of inflatables relative to mechanical systems has long been known. A 700-meter diameter inflated reflector could be carried in a single shuttle payload. Surface tolerances were demonstrated resulting acceptable gains for microwave wavelengths greater than 1 cm. total system including replacement gas is comparable or lower antenna diameters lo-20 meters. meteoroid problem much less originally anticipated because large antennas require only inflation...
This paper describes the mechanical and electrical modifications carried out on LNE watt balance to reduce noise level associated with static phase. The improvements concern home-made beam using flexure hinges as pivots of force comparator. involve source used servo-control equilibrium position during All these have led a significant improvement repeatability reproducibility results phase measurements.
The determination of the effective thermal properties inhomogeneous materials is a long-standing problem continuously interest. impressive number methods developed to measure or estimate composite clearly exhibits importance given their knowledge. Homogenization models are cheap way determine predict them. Many different approaches homogenization were developed, but last advances credited numerical methods. In this study, new computational model 2D conductivity tensor and main directions...
The A10-022 absolute gravimeter is utilised to measure the gravitational acceleration (g) for first time at 24 sites of six relative calibration baselines (the required standard uncertainty 10 µGal, 1 µGal = × 10−8 m s−2) in China. was firstly used long-term indoor observations and compared with a FG5 gravimeter. analysis data indicates that deviation measurements 4.7 maximum peak-to-peak 16.9 laboratory offset FG5-232 less than 4 µGal. expanded uncertainties are approximately 22.0 combining...
The misalignments of the LNE watt balance experiment have been studied. This paper presents evaluation unwanted horizontal forces and torques applied to coil describes experimental set-up that will be used measure vertical velocity all velocities.
In the framework of reduction weight airplanes, porous honeycomb structures are increasingly used in aircraft industry. They notably enter composition new generation composite fuselages as thermal insulating shields due to interest combining, at same time, high properties, low density, and sufficient mechanical resistance. However, their properties remain relatively unexplored number theoretical experimental studies concerning heat transfer through is very limited. Therefore, present study...
The value of the Planck constant h was determined in 2014 by means LNE watt balance experiment. relative standard uncertainty 31 parts 108. This first determination performed air with a 500 g mass made from XSH Alacrite. main components associated involve calibration, stability, buoyancy correction and magnetic interaction correction. combined due to is 7.2 use 2016 platinum iridium alloy significantly reduces component arising for measurement either or under vacuum. this contribution...
L'analyse d 'une forêt de stalagmites l'aven d'Orgnac a été rendue possible par un relevé lasergrammé trique sans contact, en grotte. Le nuage points, maillé à pas 15 mm environ ensuite traité selon deux méthodes segmentation. L'une LPE (ligne partage des eaux), permettant l'extraction régions utilisant la courbure comme primitive discriminante, l'utilisation marqueurs manuels rend méthode plus efficace et limite sur-segmentation. La seconde est basée sur l'ajustement d'ellipses successives...
Réseau majeur de la rive droite des gorges l'Ardèche, le système karstique Foussoubie, avec un développement plus 23 km, est surtout connu pour violence ses crues, notamment au niveau Goule, perte principale du système. Bien que nombreuses interrogations subsistent encore quant aux modalités exactes circulations l'eau dans zone noyée, Foussoubie offre l'avantage d'une connaissance quasi exhaustive conduits épinoyée, depuis base puits jusqu 'à l 'exutoire : l'Event Foussoubie. Cette...
This paper describes the main improvements on LNE Kibble balance in order to eliminate significant mechanical problems which prevent measurements under vacuum conditions: they will allow kilogram realizations some months.