Production d'un modèle affiné de reconnaissance d'écriture manuscrite avec eScriptorium et évaluation de ses performances

International audienceFor this workshop, participants will take part in the fine-tuning of a handwritten text recognition (HTR) model with eScriptorium. Fine-tuning a model means retraining an initial generic model with a new dataset in order to specialize it in a particular domain.Cet atelier proposera aux participant-es de prendre part à la production d'un modèle affiné de reconnaissance d'écriture manuscrite (REM) à partir de l'application eScriptorium/Kraken et de découvrir une méthodologie pour l'évaluation des performances des modèles de transcription. Un modèle affiné résulte du ré-entraînement d'un premier modèle générique à partir d'un autre jeu de données, avec comme objectif de le spécialiser dans un domaine particulier

Acercamiento biológico al currículo intercultural: Una reflexión desde la noción de memes y la teoría de la herencia dual

Se plantea un acercamiento al currículo intercultural desde los referentes de la perspectiva biológica y la configuración de las teorías evolutivas dando una interpretación antropológica a la interculturalidad dentro de los procesos biopedagógicos, que evidencia posibles mecanismos de adaptación biológica en los seres humanos que contribuyen a la identidad de los individuos y que puede ser trasmitidos por codificación cultural (memes) y por medio de procesos educativos dentro de un territorio, independiente de la clasificación social de los individuos dentro de la comunidad. Al respecto, se desarrolla una interlocución teórica con distintos autores en torno a las categorías de cultura e interculturalidad en relación con los planteamientos de las teorías de la herencia dual. Posteriormente, se plantea una serie de interrogantes que se desaprenden de las posibilidades de pensar la educación y la interculturalidad desde una perspectiva biológica. Finalmente, se reflexiona alrededor de las bases conceptuales mediante los cuales los grupos sociales coevolucionan desde la perspectiva educativa

Contribution of electrochemical impedance spectroscopy to the study of aluminium-magnesium alloys corrosion in magnesium potassium phosphate cement pore solution

International audienc

Highlighting aluminium-magnesium alloys passivation in magnesium potassium phosphate cement: a step forward towards the conditioning of such metallic waste

International audienc

Magnesium potassium phosphate cement: a promising binder for the conditioning of aluminum-magnesium alloys waste

International audienceThe reprocessing of spent fuel designed for natural uranium – graphite – gas reactors has produced somewaste with aluminum alloys, which need to be stabilized and solidified before their final disposal. Portlandcement is extensively used for the conditioning of low-level and intermediate-level radioactive waste;however, its high alkalinity is a serious obstacle to aluminum stabilization, as it is oxidized by the mixingsolution, with production of dihydrogen. This work investigates a new solution consisting in usingmagnesium potassium phosphate cement (MKPC) instead of Portland cement (PC). Gas chromatographyand electrochemical impedance spectroscopy (EIS) are used to monitor the corrosion of pure aluminum and aluminum-magnesium alloys containing 2 to 4.5 wt.% of Mg in MKPC mortar. EIS provides qualitativeinformation about the corrosion, but also makes it possible to assess the corrosion current using anequivalent electrical circuit linked to the kinetic parameters of the postulated corrosion mechanism. It isshown that the corrosion current of the alloys, regardless of their composition, is reduced by about twoorders of magnitude in MKPC mortar as compared to Portland cement mortar. This result opens up newprospects for increasing the incorporation rate of reactive Al metal in a cementitious matrix

Highlighting aluminium-magnesium alloys passivation in magnesium potassium phosphate cement: a step forward towards the conditioning of such metallic waste

International audienc

Contribution of electrochemical impedance spectroscopy to the study of aluminium-magnesium alloys corrosion in magnesium potassium phosphate cement pore solution

International audienc

Magnesium potassium phosphate cement: a promising binder for the conditioning of aluminum-magnesium alloys waste

International audienceThe reprocessing of spent fuel designed for natural uranium – graphite – gas reactors has produced somewaste with aluminum alloys, which need to be stabilized and solidified before their final disposal. Portlandcement is extensively used for the conditioning of low-level and intermediate-level radioactive waste;however, its high alkalinity is a serious obstacle to aluminum stabilization, as it is oxidized by the mixingsolution, with production of dihydrogen. This work investigates a new solution consisting in usingmagnesium potassium phosphate cement (MKPC) instead of Portland cement (PC). Gas chromatographyand electrochemical impedance spectroscopy (EIS) are used to monitor the corrosion of pure aluminum and aluminum-magnesium alloys containing 2 to 4.5 wt.% of Mg in MKPC mortar. EIS provides qualitativeinformation about the corrosion, but also makes it possible to assess the corrosion current using anequivalent electrical circuit linked to the kinetic parameters of the postulated corrosion mechanism. It isshown that the corrosion current of the alloys, regardless of their composition, is reduced by about twoorders of magnitude in MKPC mortar as compared to Portland cement mortar. This result opens up newprospects for increasing the incorporation rate of reactive Al metal in a cementitious matrix

Investigation of self-desiccating cement-based materials for dihydrogen sequestration: Interactions between γ-MnO₂Ag₂CO₃ getter and the cement matrix

International audienceMitigating the release of dihydrogen resulting from metal corrosion or water radiolysis is an important issue for the disposal of certain types of cemented radwaste packages. The approach investigated in this work consists in adding an oxide getter (γ-MnO2Ag2CO3) to the cement matrix. Since the efficiency of the getter decreases under wet environment, two self-desiccating binders, a calcium sulfo-aluminate cement (CSA) and a magnesium potassium phosphate cement (MKP), are used to obtain significant desaturation of the pore network by the sole hydration reactions. It is shown that the getter slightly influences the rate of cement hydration at early age (acceleration for MKP, retardation for CSA), but has no effect afterwards. Sorption of ions released by the dissolution of cement phases onto γ-MnO2 is evidenced, as well as partial or total destabilization of silver carbonate. Nevertheless, the getter still enables to reduce strongly the outgassing of dihydrogen from mortars encapsulating Al-metal