Publications de Jonathan Olivier

HiBSO Hip Exoskeleton: Toward a Wearable and Autonomous Design

Hannes Bleuler, Mohamed Bouri, Amalric Louis Ortlieb, Jonathan Olivier, Romain Pierre François Baud

HiBSO is an active orthosis designed to assist the hip flexion-extension of the elderly. A fully autonomous system with untethered power electronics and energy supply is now available. Going beyond the restricted walking conditions of a treadmill unveils m ...

SPRINGER INTERNATIONAL PUBLISHING AG2018

Series Elastic Actuation for Assistive Orthotic Devices: Case Study of Pneumatic Actuator

Hannes Bleuler, Mohamed Bouri, Amalric Louis Ortlieb, Jonathan Olivier

Wearable assistive robotics is a modern field where intelligent actuated systems work in collaboration with the body to replace a lost limb, to enhance performances (e.g. carrying load, walking, running, jumping) or to train or rehabilitate specific activi ...

Springer-Verlag Berlin2016

Advances in Electronics Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen, Nicolas Lamaison

This article highlights the advantages of on-chip microchannel cooling technology, based on first-and second-law analysis and experimental tests on two types of cooling cycles, the first driven by an oil-free liquid pump and the second by an oil-free vapor ...

Taylor & Francis2013

On-chip two-phase cooling of datacenters: Cooling system and energy recovery evaluation

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

Cooling of datacenters is estimated to have an annual electricity cost of 1.4 billion dollars in the United States and 3.6 billion dollars worldwide. Currently, refrigerated air is the most widely used means of cooling datacenter’s servers, which typically ...

Elsevier2012

On-Chip Two-Phase Cooling with Refrigerant 85 mu m-Wide Multi-Microchannel Evaporator Under Hot-Spot Conditions

John Richard Thome, Stefano Nebuloni, Etienne Costa-Patry, Jonathan Olivier

Hot-spots are present in micro-electronics and are challenging to cool effectively. This paper presents highly nonuniform heat flux measurements obtained for a pseudo-CPU with 35 local heaters and temperature sensors cooled by a silicon multi-microchannel ...

2012

Green Cooling of High Performance Micro Processors: Parametric Study between Flow Boiling and Water Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

Due to the increase in energy prices and spiralling consumption, there is a need to greatly reduce the cost of electricity within data centers, where it makes up 50% of the total cost of the IT infrastructure. A technological solution to this is using on-c ...

2011

A Review of On-Chip Micro-Evaporation: Experimental Evaluation of Liquid Pumping and Vapor Compression Driven Cooling Systems and Control

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

Thermal designers of data centers and server manufacturers are showing a greater concern regarding the cooling of the new generation data centers, which consume considerably more electricity and dissipate much more waste heat, a situation that is creating ...

2011

Reasons to Use Two-phase Refrigerant Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

2011

Flow Boiling of R134a in a Multi-Microchannel Heat Sink with Hotspot Heaters for Energy-Efficient Microelectronic CPU Cooling Applications

John Richard Thome, Yassir Madhour, Etienne Costa-Patry, Jonathan Olivier, Bruno Michel

This paper focuses on two-phase flow boiling of refrigerant R134a inside a copper multi-microchannel heat sink for microelectronic central processing unit cooling applications. The heat sink is composed of 100 parallel microchannels, 100 mu m wide, 680 mu ...

2011

Two-phase flow of refrigerants in 85μm-wide multi-microchannels: Part II – Heat transfer with 35 local heaters

John Richard Thome, Etienne Costa-Patry, Jonathan Olivier, Bruno Michel

This article is the second part of a study on flow boiling of R236fa and R245fa. This part presents the heat transfer coefficients obtained in a 12.7 mm silicon evaporator composed of 135 microchannels with 85 mu m wide and 560 mu m high channels separated ...

Elsevier2011

Heat Transfer, Pressure Drops, and Flow Pattern Recognition during Condensation inside Smooth, Helical Micro-Fin and HerringBone Tubes

John Richard Thome, Jonathan Olivier

2007

Flow Pattern Based Pressure Drop Correlations for Refrigerant Condensation in Smooth and Enhanced Tubes

John Richard Thome, Jonathan Olivier

2005