Publications by Simon Nessim Henein

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Flexure-based constant-force mechanisms belong to the category of zero-stiffness mechanisms. They present a non-zero elastic restoring force which does not depend on the deformation of the mechanism. However, their design and modeling are frequently comple ...

Binary logic operations are the building blocks of computing machines. In this paper, we present a new programmable binary logic gate based on programmable multistable mechanisms (PMM), which are multistable structures whose stability behavior depends on m ...

An optical measuring element measures forces at least one direction. The measuring element has a single-piece structure. There is an outside wall with notches introduced therein. Each notch defines parallel edges, and the notches define more or less elasti ...

Using shape memory alloys (SMAs) as actuators offers several advantages, including high power density, large stroke capabilities, and friction elimination. These attributes make SMAs suitable for actuating flexure-based mechanisms in a wide array of extrem ...

This article describes a novel method for applying a contact force in the range of 1 to 100 μN with pointed probe on a microscale sample in order to perform ohmic electrical measurements. The solution is based on the new TIVOT active load cell combining th ...

L'introduction d'un oscillateur comme base de temps a marqué une révolution dans la mesure précise du temps. Cet article décrit comment les chercheurs du 17e siècle ont découvert les oscillateurs qui règlent nos horloges et montres mécaniques. Une lecture ...

This paper presents a novel goniometer which is designed for use with X-ray diffraction analysis in protein crystallography. The PRIGO (Parallel Robotics Inspired Goniometer) is a 6 degree of freedom positioning device, allowing 3 translations (x, y, z) an ...

The tasks of electrical micro- and nanoprobing require precision that goes beyond human perception and therefore, depend on sensors providing real-time feedback. Efforts towards automation in micro- and nanoprobing and emerging areas such as branched nanow ...

This article presents the design, implementation and characterization of a Littman-Metcalf extended-cavity diode laser. The extended cavity is closed by a roof (retro-reflecting) prism. The wavelength tuning is based on a two degrees-of-freedom monolithic ...

This paper presents the design, optimization, and validation of a novel flexure-based constant-velocity (CV) joint-called Anvil Joint-benefiting from the high axial load capacity of the known notch universal joint [1] and the low homokinetic defect of the known O 3 XY 3 universal flexure [2] relying on equatorial folded leaf springs. The Anvil joint and the O 3 XY 3 are analysed and compared through numerical optimization using the Spacar software, followed by finite element validation in COMSOL. The Anvil

The invention relates to an immobilizing device for a toothed wheel suitable for the field of horology where it can be part of a direct- or indirect-impulse escapement, in particular in a wristwatch. This immobilizing device (1, 2, 3, 4, 5, 6) comprises: — ...

The present invention provides an image forming apparatus (210) as well as a developing cartridge (240) for use in an image forming apparatus, wherein a contact plate of an electrode (247) of the developing catridge is disposed to contact a bias terminal ( ...

Le projet ASCOPET étudie les arts de la scène comme outil pédagogique pour l’enseignement tertiaire. A l’EPFL, la pratique de l’improvisation, et la création d’une performance collective présentée sur la scène du théâtre l’Arsenic, permettent qinsi de trav ...

Cet article décrit différents aspects originaux relatifs à la conception des structures articulées à guidages flexibles dédiées aux robots de très haute précision. Il montre tout d'abord quels types de ressorts peuvent être utilisés comme articulations et quels types de liaisons cinématiques constituent ces éléments. Il montre ensuite un principe original de conception qui permet de compenser la rigidité naturelle des guidages flexibles. Il discute également de l'utilisation de guidages flexibles redondants

This paper presents a novel planar four-bar linkage compliant mechanism (called 4-RCC) based on four flexure-based Remote Center of Compliance (RCC) pivots. With particular configurations and dimensions, the beam shortening of the RCC pivots can compensate ...

L’échappement à détente est reconnu pour sa performance chronométrique, mais il n’est pas sécurisé pour la montre-bracelet. Plusieurs échappements ont été proposés pour adapter cet échappement à la montre, dont l’échappement Robin récemment sécurisé par Au ...

This book delves into essential, yet often overlooked, aspects of educational and scientifi c practices: the involvement of the body in knowledge acquisition and production, the collective nature of creativity, and the potent role of improvisation in all l ...

Nous présentons la méthode du tracé primitif développée par le premier auteur dans sa thèse de doctorat. Cette nouvelle méthode donne pour la première fois une approche systématique à la problématique du tracé d’un échappement horloger. Elle revient à considérer chacune des phases cinématiques d’un échappement comme une transmission par engrenages. Puisque les engrenages sont décrits par leurs cercles primitifs, il s’ensuit que le fonctionnement d’un échappement peut être décrit par l’ensemble des arcs de c

Simon Nessim Henein

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Three-beam constant-force flexure-based translation stage

Programmable Logic Gates Based On Tunable Multistable Mechanisms

Optical measuring element having a single-piece structure

Shape memory alloy mechanical actuator with reduced commutation time

Active load cell with positive, negative and zero stiffness operating modes for micronewton range contact force monitoring in electrical probing

A la recherche du temps précis : la découverte de l’oscillateur

PRIGO: Parallel Robotics Inspired Goniometer for Protein Crystallography

A load cell with adjustable stiffness and zero offset tuning dedicated to electrical micro- and nanoprobing

Tunable Extended-cavity Diode Laser Based on a Novel Flexure-mechanism

Design of a Flexure-Based Constant-Velocity Joint Optimized for High Axial Loads

Immobilizing device for a toothed wheel

Correcteur d'isochromisme pour échappement horloger et échappement muni d'un tel correcteur

Improgineering : former à la conception collective par l’improvisation

Structures articulées à guidages flexibles

Rectilinear translation four-bar flexure mechanism based on four Remote Center Compliance pivots

Echappements à impulsion virtuelle

Two degree of freedom mechanical oscillator

Barefoot Academic Teaching, Performing Arts as a pedagogical tool in Higher Education

Dissonant Geometries

Analyse, synthèse et création d’échappements horlogers par la théorie des engrenages