Concept

International Prototype of the Kilogram

Publications associées (22)

Control-Free Mechanical Oscillator Powered by Shape Memory Alloys

Yves Perriard, Paolo Germano, Thomas Guillaume Martinez, Sean Thomas

Shape Memory Alloy (SMA) based actuators have been commonly used in applications that require being compact and lightweight. In this paper, the inherent stiffness of a flexure-based linear guide is used to create a bias-spring SMA actuator which further re ...

IEEE2021

Shaking force balancing of a 2-DOF isotropic horological oscillator

Simon Nessim Henein, Hubert Pierre-Marie Benoît Schneegans, Etienne Frédéric Gabriel Thalmann

Despite centuries of research and significant advances, the escapement mechanism used to count and maintain oscillations of mechanical time bases remains a complex mechanism and a major source of energy losses. We showed in previous work that, instead of t ...

2021

A Short Synthesis of the 2-Bromo-N,9-dimethyl-6,7,8,9-tetrahydro-5H-pyrido[2,3-b]indol-6-amine Building Block

Andrea Pfeifer, Andreas Muhs

A concise synthesis of pharmaceutically useful (R)-tert-butyl N-(2-bromo-9-methyl-6,7,8,9-tetrahydro-5H-pyrido [2,3-b ] indol-6-yl) -N-methylcarbamate building block 11 is described. The racemic intermediate 17 was prepared in a single step from 2-bromo-6- ...

AMER CHEMICAL SOC2019

Conception d’un pont en béton

Marko Vasic

L’objectif du projet est la conception et le dimensionnement d’un pont en béton armé en précontrainte. Plus précisément, le sujet est le pont de Tiguelet, un nouvel ouvrage, qui a pour but de joindre deux routes séparées par des voies de chemin de fer. Pou ...

2018

Influence of geometrical imperfections and flaws at welds of steel liners on fatigue behavior of pressure tunnels and shafts in anisotropic rock

Alexandre Jean Pachoud

The recent development of high-strength (HSS) weldable steels has enlarged the range of design alternatives for the optimization of high-head steel-lined pressure tunnels and shafts (SLPT&S) in the hydropower industry. With the liberalization of the Europe ...

EPFL2017

An Adaptive Neuromuscular Controller for Assistive Lower-Limb Exoskeletons: A Preliminary Study on Subjects with Spinal Cord Injury

Auke Ijspeert, Florin Dzeladini, Amy Roning Wu, Tycho Jan Henricus Brug

Versatility is important for a wearable exoskeleton controller to be responsive to both the user and the environment. These characteristics are especially important for subjects with spinal cord injury (SCI), where active recruitment of their own neuromusc ...

Frontiers Research Foundation2017

Gérer les meilleures terres agricoles en Suisse; Pratiques cantonales et perspectives d'évolution

Jérôme Chenal, Marc Antoine Messer, Stéphanie Aline Hasler, Mariano Bonriposi

Les surfaces d’assolement illustrent un double paradoxe pour l’aménagement du territoire en Suisse. Premièrement, si les surfaces d’assolement sont les meilleures terres pour la production agricole et donc aussi pour garantir les moyens de subsistance d’un ...

2016

AnonRep: Towards Tracking-Resistant Anonymous Reputation

Bryan Alexander Ford, Ennan Zhai

Reputation systems help users evaluate information quality and incentivize civilized behavior, often by tallying feedback from other users such as "likes" or votes and linking these scores to a user’s long-term identity. This identity linkage enables user ...

USENIX2016

A low-cost UWB sensor node powered by a piezoelectric harvester or solar cells

Nico de Rooij, Danick Briand, Anja Skrivervik, Pierre-André Farine, Franz-Josef Haug, Cyril Botteron, Pattanaphong Janphuang, Robert Andrew Lockhart, Christian Robert, Gabriele Tasselli

We propose an autonomous battery-less wireless sensor node that combines on a single printed circuit board an ultra-wideband (UWB) transmitter and its printed antenna, together with a piezoelectric cantilever and a solar cell array to harvest vibrations an ...

Elsevier2016

Hydroacoustic Modeling of a Cavitation Vortex Rope for a Francis Turbine

Christian Landry

Hydraulic machines subject to off-design operation involve the presence of cavitating flow regimes in the draft tube. The cavitation vortex rope at part load conditions is described as an excitation source for the hydraulic system, and interactions between ...

EPFL2015

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