Characterization of metal binding sites onto biochar using rare earth elements as a fingerprint

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Résultats préliminaires sur l'immobilisation chimique de rongeurs africains : l'athérure (Atherurus africanus, Gray 1842) et le cricétome (Cricetomys emini, Waterhouse 1840). Etude portant sur quatre protocoles

Le projet Développement au Gabon de l'élevage de gibier travaille sur la mise au point de référentiels techniques sur l'élevage de plusieurs espèces sauvages parmi lesquelles se trouvent l'athérure africain (Atherurus africanus) et le cricétome (Cricetomys emini). Dans le cadre de leur pratique courante, les auteurs ont été amenés à effectuer sur ces animaux des soins qui ont parfois nécessité une anesthésie. Les effets de quatre protocoles ont été testés à différentes posologies : l'acépromazine, la xylazine, une combinaison de xylazine et de kétamine et une combinaison de zolazépam et de tilétamine. Chez l'athérure, la xylazine seule a entraîné des durées d'induction, d'état et de réveil très variables. L'association de la xylazine à 1 mg/kg et de la kétamine à 5 mg/kg s'est avérée très efficace pour l'obtention d'une anesthésie chirurgicale. Chez le cricétome, l'acépromazine à 5 mg/kg a fourni un état de tranquillisation satisfaisant. Pour obtenir une anesthésie chirurgicale, l'association xylazine à 10 mg/kg et kétamine à 50 mg/kg s'est avérée efficace. L'utilisation de xylazine seule ne semble pas indiquée chez cette espèce. (Résumé d'auteur

Reconfiguration Strategies with Composite Data Physicalizations

Composite data physicalizations allow for the physical reconfguration of data points, creating new opportunities for interaction and engagement. However, there is a lack of understanding of people's strategies and behaviors when directly manipulating physical data objects. In this paper, we systematically characterize diferent reconfguration strategies using six exemplar physicalizations. We asked 20 participants to reorganize these exemplars with two levels of restriction: changing a single data object versus changing multiple data objects. Our fndings show that there were two main reconfguration strategies used: changes in proximity and changes in atomic orientation. We further characterize these using concrete examples of participant actions in relation to the structure of the physicalizations. We contribute an overview of reconfguration strategies, which informs the design of future manually reconfgurable and dynamic composite physicalizations.</p

Feasibility of the Simultaneous Determination of Monomer Concentrations and Particle Size in Emulsion Polymerization Using in Situ Raman Spectroscopy.

An immersion Raman probe was used in emulsion copolymerization reactions to measure monomer concentrations and particle sizes. Quantitative determination of monomer concentrations is feasible in two-monomer copolymerizations, but only the overall conversion could be measured by Raman spectroscopy in a four-monomer copolymerization. The feasibility of measuring monomer conversion and particle size was established using partial least-squares (PLS) calibration models. A simplified theoretical framework for the measurement of particle sizes based on photon scattering is presented, based on the elastic-sphere-vibration and surface-tension models.The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (EC FP7) Grant Agreement n. [NMP2-SL-2012-280827] and Engineering and Physical Sciences Research Council under grant EP/L003309/1.This is the final version of the article. It first appeared from the American Chemical Society via http://dx.doi.org/10.1021/acs.iecr.5b0275

Leaching and phytoavailability of zinc and cadmium in a contaminated soil treated with zero-valent iron

Immobilization of heavy metals by stabilization amendments is a promising method to restore contaminated soils. In our study, we investigated the efficiency of zero-valent iron (Fe0) added to the soil in the form of iron grit to reduce leaching and uptake of Zn and Cd by Lupinus albus L. Results of column leaching experiments show that metal leaching decreased proportionally to the rate of amendment application (1%, 2% or 5%: w/w) and that the reduction reached up to 98% and 83% for Zn and Cd respectively. An increase in pH and in the number of sorption sites which bind ionic free metals and organometal complexes are possible mechanisms for this attenuation. Moreover, a rhizobox experiment has demonstrated that phytoavailability of Zn and Cd was reduced by 63% and 45% respectively when soil was treated with 5% (w/w) iron grit, and that L. albus did not develop strategies to reduce Zn and Cd uptake in untreated soil. We conclude that covering contaminated soil with L. albus could be used in association with immobilization techniques for soil remediation. However, it is crucial that the amendment and the soil be thoroughly homogenized in order to ensure the maximum reduction of metal uptake

Participatory Design for Whom? Designing Conversational User Interfaces for Sensitive Settings and Vulnerable Populations

Conversational User Interfaces (CUIs) are becoming increasingly applied in a broad range of sensitive settings to address the needs and struggles of vulnerable or marginalized users. Sensitive settings include, for instance, CUIs mediating the communication difficulties of people with dementia or supporting refugees to cope with new cultural practices as a chatbot on a government website. While researchers are increasingly designing CUIs for such sensitive set tings, methods and participatory design approaches to address vulnerable user groups’ highly sensitive needs and struggles are sparse in research thus far. This workshop aims to explore how we can design CUIs for and in sensitive settings with vulnerable users in mind through the participatory design process. We aim to establish a working definition of vulnerability, sensitive settings, and how practice-oriented design of CUIs can be inclusive of diverse users