3D Computation of reactive moulding processes

International audienceElectrical equipment for medium and high voltage is manufactured using reactive moulding process. During mould filling, air bubbles or weld-lines can appear which may be a huge problem for electrical insulation devices. Moreover, the use of thermoset materials induces delamination due to the resin's shrinkage. Product development delays can be reduced using numerical tools to simulate part forming process. In this paper, we present a three dimensional finite element analysis of the filling and curing stages of reactive moulding process. During the first stage, flow computation takes into account heat transfer and the curing reaction according to appropriate models. In the curing phase, the evolution of the degree of cure is coupled with an evolution model of the glass transition temperature. Taking in account his coupling phenomenon permits the computation of a more realistic curing kinetic and modelling of the slowdown at vitrification. The thermal field prediction is then more accurate. To validate this approach, experiments were performed. A comparison with computational results shows a good agreement in filling and temperature evolution inside the cavity

Electric vehicle range and battery lifetime: a trade-off

32 nd Electric Vehicle Symposium (EVS32), LYON, FRANCE, 19-/05/2019 - 22/05/201

Systems and synthetic biology of the vessel wall.

Atherosclerosis is intimately coupled to blood flow by the presence of predilection sites. The coupling is through mechanotransduction of endothelial cells and approximately 2000 gene are associated with this process. This paper describes a new platform to study and identify new signalling pathways in endothelial cells covering an atherosclerotic plaque. The identified networks are synthesized in primary cells to study their reaction to flow. This synthetic approach might lead to new insights and drug targets

Real-world battery duty profile of a neighbourhood electric vehicle

International audiencehe study of traction batteries real-world usage in vehicular applications faces a handful of serious challenges. To date, we are unable to accurately predict the cycle life of a battery under real-world operating conditions. There are a couple of reasons for that; on the one hand, the battery technology evolves rapidly whereas the battery cycle life testing requires large amounts of time and on the second hand, we know little about real-world duty profile of batteries. The work presented here intends to tackle this latter issue. In this paper, we evaluate real-world collected data of battery usage in an instrumented neighbourhood electric vehicle, using a new approach based on the concept of duty pulses. This automated method relies on the K-means clustering algorithm and aims at classifying duty pulses according to their current and energy distributions. We present the way data must be prepared and we discuss the results of the clustering. We report on the duty profiles of this vehicle's battery under various driving conditions

Electric vehicle range and battery lifetime: a trade-off

32 nd Electric Vehicle Symposium (EVS32), LYON, FRANCE, 19-/05/2019 - 22/05/2019Extended range of electric vehicles is seen as a mean to accelerate the market penetration of electricvehicles. However, putting more and more battery cells in a pack may lead to an unsuitable usageregarding battery lifetime. In this paper, we assess the impact of oversizing batteries in their lifetimeand their total cost of ownership. Simulation results reveal a reduction in battery lifetime of largerbatteries when charge is not adapted, dramatically increasing the total cost of ownership. On the contrary,optimisation of the charging strategy preserves the battery’s performances for a longer time and lead toimportant cost savings

Flexible Over-Moded Resonators Based on P(VDF-TrFE) Thin Films With Very High Temperature Coefficient

International audienceThis work presents for the first time a flexible over-moded resonator (OMR) based on P(VDF-TrFE) thin films. The devices were manufactured on commercially available elastic substrate with inkjet-printed electrodes. The sensing copolymer films used in the devices were polarized by the corona method after electrode deposition. The main performance parameters of the component were then determined. The manufactured OMRs on P(VDF-TrFE) exhibited a linear variation of frequency versus temperature and a very large value of temperature coefficient of frequency (TCF > 1600 ppm/degrees C). These properties suggest a great potential for using such components as low-cost and high-precision temperature sensors. The electromechanical coupling coefficient and the quality factor of the resonator were also characterized versus temperature

Toward Monocyte HLA-DR Bedside Monitoring: A Proof-of-Concept Study

International audienc

Study of Feasibility for 2D and 3D Innovative Jet Printed RF Devices

International audienceThis work presents a radiofrequency (RF) performance review of a conductive ink dispensing process for RF applications. This innovative process allows to functionalize existing objects like plastic cases for adding a RF function. It can print devices on a substrate placed horizontally or in a tilted position. The main purpose of this work consists in showing the feasibility of this process. First, Coplanar transmission lines are printed with silver ink on horizontal substrate by a simple configuration. It exhibits a performant attenuation coefficient: α4GHz=0.021±0.007 dB/mm. In a second part, a 6-axis robot is used for improving the 3D process, coplanar transmission lines are also printed and exhibit a performant attenuation coefficient: α4GHz=0.060±0.009 dB/mm. Finally, coplanar lines are printed on tilted plastic substrate and then measured. The scattering parameters of horizontal and tilted substrates are similar and exhibit a good performance in the range of 0 to 4 GHz

Effect of an Adapted Physical Activity Program on Stress, Anxiety, Depression in Patients with Schizophrenia: Study Protocol of a Randomized-Controlled Trial

International audiencePhysical activity (PA) is recommended to optimize well-functioning in people with schizophrenia. PA has been found to improve quality of life, general symptomatology, depression, anxiety and stress symptoms, global and social functioning. In PA research, most of the interventions are based on one-on-one interventions but there is poor information about group-based PA interventions. Using a randomized controlled, clinician-blinded trial, subjects are randomized into two arms: the PA group or control group. Our first objective is about to evaluate the effects of a multimodal 6 week collective PA intervention on depression, anxiety, and stress symptoms in people with schizophrenia. Our second objective is about to evaluate these effects on secondary outcomes especially smoking, well-being, physical fitness and on care utilization. All participants are evaluated before and after the 6 week intervention period, and only participants in the PA group are called in a follow-up interview 3 and 6 months after the intervention