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Green Ceramic Machining: Influence of the Cutting Speed and the Binder Percentage on the Y-TZP Behavior
21 mai 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Abstract : "The demand for inert bioceramics is always increasing in the dental field. Yttrium oxide tetragonal zirconia polycrystals (Y-TZP) are oxide ceramics which are currently used because of their interesting mechanical properties due to a toughening transformation. Industrially speaking, machining of the ceramic before sintering (green body) is very common because it allows a better productivity ...
A new manufacturing chain for ceramic shaping: sequential combination of milling and laser machining in green ceramic
juin 2020,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
Contribution to euspen’s 20th International Conference & Exhibition (Geneva, CH, June 2020)
Abstract :
"The ceramic microcomponents have very interesting mechanical and thermal properties in an extreme environment such as a high temperature, a corrosive environment, etc. Unfortunately, the principal limitation of ceramic material usage is its shaping because of the brittlness of the material. ...
Experimental investigation on green ceramic machining with nanosecond laser source
03 décembre 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Abstract : "Yttrium oxide tetragonal zirconia polycrystals (Y-TZP) is an inert bioceramic used for many bio-implantable applications that request a high accuracy which is difficult to achieve with the current technologies. Laser machining of hard ceramic is difficult because the interaction of the laser beam with the material can lead to microcracks and surface modifications of the microstructure. ...
Prediction of local sintering in laser beam machining of green Y-TZP ceramic
20 mai 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Abstract : "Laser beam machining of Y-TZP engineering ceramic material is carried out in green stage to increase the material removal rate. The generation of hot spots may cause local sintering of the ceramic material leading to a decrease of the mechanical properties of the final sintered component. This paper presents the implementation of alternative laser beam paths to reduce the hot spots ...
Influence of Conventional Machining on Chemical Finishing of Ti6Al4V Electron Beam Melting Parts
26 avril 2020,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"Additive manufacturing is feeding great hopes for future developments in fields such as aeronautical, biomedical and rapid tooling industrssssies. However, limitations are still restricting its use to make prototypes and hampering mass production. In the case of titanium alloy printing (e.g. Ti6Al4V) with the EBM (Electron Beam Melting) process, the major obstacle to use parts directly after printing ...
Root Morphological Traits of Seedlings Are Predictors of Seed Yield and Quality in Winter Oilseed Rape Hybrid Cultivars
15 octobre 2020,
- HE Condorcet
- CARAH
,
- Article scientifique
Article scientifique
The root system is responsible for soil resources acquisition. Hence, optimizing crop root characteristics has considerable implications for agricultural production. This study evaluated a panel of twenty-eight European modern cultivars of oilseed rape (Brassica napus L.) cultivated in laboratory and field environments. Root morphology was screened using a high-throughput hydroponic growth system ...
In-Field Observation of Root Growth and Nitrogen Uptake Efficency of Winter Oilseed Rape
10 janvier 2020,
- HE Condorcet
- CARAH
,
- Article scientifique
Article scientifique
Field trials were conducted with two nitrogen applications (0 or 240 kg N ha−1) and three modern cultivars of winter oilseed rape (Brassica napus L.) previously selected from a root morphology screen at a young developmental stage. The purpose is to examine the relationship between root morphology and Nitrogen Uptake Efficiency (NUpE) and to test the predictiveness of some canopy optical indices for ...
EEG dynamics and neural generators of psychological flow during one tightrope performance
24 juillet 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Psychological “flow” emerges from a goal requiring action, and a match between skills and challenge.
Using high-density electroencephalographic (EEG) recording, we quantified the neural generators characterizing psychological “flow” compared to a mindful “stress” state during a professional tightrope performance. Applying swLORETA based on self-reported mental states revealed the right superior ...
EEG-based brain-computer interface for alpha speed control of a small robot using the MUSE headband
28 septembre 2020,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
Non-invasive BMI applications are increasingly used in different contexts ranging from industrial, clinical and gaming. After having tested the difference between a classical EEG recorder with electroconductive gel (ANT system) and the MUSE EEG headband, we studied the BCI performances of the later during the control of a small robot. We demonstrated that the participants were able to successfully ...
Neural generators involved in visual cue processing in children with attention-deficit/hyperactivity disorder (ADHD)
10 novembre 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Event-related potentials (ERP) studies report alterations in the ongoing visuo-attentional processes in children with attention deficit/hyperactivity disorder (ADHD).
We hypothesized that the neural generators progressively recruited after a cue stimulus imply executive-related areas well before engagement in executive processing in children with ADHD compared to typically developed children (TDC)