La Pédagogie de la marche pour l'enseignement des sciences et la connexion plus qu'humaine

This literary-visual métissage weaves together stories, scholarship and photographs. What can be unearthed—science education, embodied knowledge, environmental ethics—when we walk on the land? Embodied and sensorial engagement fosters relational and enlivening educational experiences. Whether preschool or post-doc, direct sense experience offers not only active and experiential pedagogy, but also a spiritual attunement with the natural world. Now, amid the climate crisis and screen fatigue pandemic, such Earth resonance is of utmost import. Let us walk through a snowy forest, ponder what counsel our shoeless feet (and David Abram) afford us, and envision the learning environment as an emergent and adaptable opportunity for connection and wonder.Ce métissage littéraire-visuel mêle des histoires, l’érudition et des photos. Que peut-on découvrir—l’enseignement scientifique, des connaissances incarnées, l’éthique environnementale—lorsque nous marchons sur la terre? L'engagement incarné et sensoriel favorise les expériences éducatives relationnelles et animantes. Qu'elle soit préscolaire ou post-doctorale, l'expérience sensorielle directe offre non seulement une pédagogie active et expérientielle, mais aussi une harmonisation spirituelle avec le monde naturel. Aujourd'hui, au milieu de la crise climatique et de la pandémie de fatigue écran, une telle résonance de la Terre est de la plus haute importance. Marchons à travers une forêt enneigée, réfléchissons aux conseils que nos pieds sans chaussures (et David Abram) nous offrent, et envisageons l'environnement d'apprentissage comme une opportunité émergente et adaptable de connexion et d'émerveillement

Control of mobility in molecular organic semiconductors by dendrimer generation

Conjugated dendrimers are of interest as novel materials for light-emitting diodes. They consist of a luminescent chromophore at the core with highly branched conjugated dendron sidegroups. In these materials, light emission occurs from the core and is independent of generation. The dendron branching controls the separation between the chromophores, We present here a family of conjugated dendrimers and investigate the effect of dendron branching on light emission and charge transport. We apply a number of transport measurement techniques to thin films of a conjugated dendrimer in a light-emitting diode configuration to determine the effect of chromophore spacing on charge transport. We find that the mobility is reduced by two orders of magnitude as the size of the molecule doubles with increased branching or dendrimer generation. The degree of branching allows a unique control of mobility by molecular structure. An increase in chromophore separation also results in a reduction of intermolecular interactions, which reduces the red emission tail in film photoluminescence. We find that the steady-state charge transport is well described by a simple device model incorporating the effect of generation, and use the materials to shed light on the interpretation of transient electroluminescence data. We demonstrate the significance of the ability to tune the mobility in bilayer devices, where a more balanced charge transport can be achieved

Molecular tweezers with freely rotating linker and porphyrin moieties

Molecular tweezers were synthesised by using a microwave accelerated alkene plus cyclobutane epoxide reaction between norbornyl appended porphyrin moieties and a diepoxide functionalised phenyl diimide spacer. The tweezers contain several rotational degrees of freedom; about the porphyrin with respect to the norbornyl linker, and between the two norbornyl backbone sections. The ability of Zn(super)II metallated tweezer 1 to complex 1,4-diazabicyclo[2.2.2]octane (DABCO) was studied by UV/Vis and ¹H NMR spectroscopy and multivariate global spectral analysis. The system was found to form a strong 1:1 intramolecular complex (1:DABCO) with an association constant of K₁₁ = 8.1 × 10⁷ M⁻¹, transforming to a 1:2 open complex [1:(DABCO)₂] with K₁₂ = 2.7 × 10⁹ M⁻² at high concentrations of DABCO.Rhys B. Murphy, Duc-Truc Pham, Stephen F. Lincoln, and Martin R. Johnsto

Biostratigraphy of large benthic foraminifera from Hole U1468A (Maldives): A CT-scan taxonomic approach

Large benthic foraminifera are important components of tropical shallow water carbonates. Their structure, developed to host algal symbionts, can be extremely elaborate and presents stratigraphically-significant evolutionary patterns. Therefore their distribution is important in biostratigraphy, especially in the Indo-Pacific area. To provide a reliable age model for two intervals of IODP Hole U1468A from the Maldives Inner-Sea, large benthic foraminifera have been studied with computed tomography. This technique provided 3D models ideal for biometric-based identifications, allowing the upper interval to be placed in the late middle-Miocene and the lower interval in the late Oligocene