Born-Oppenheimer potential for H2_2

The Born-Oppenheimer potential for the $^1\Sigma_g^+$ state of H$_2$ is obtained in the range of 0.1 -- 20 au, using analytic formulas and recursion relations for two-center two-electron integrals with exponential functions. For small distances James-Coolidge basis is used, while for large distances the Heitler-London functions with arbitrary polynomial in electron variables. In the whole range of internuclear distance about $10^{-15}$ precision is achieved, as an example at the equilibrium distance $r=1.4011$ au the Born-Oppenheimer potential amounts to $-1.174\,475\,931\,400\,216\,7(3)$. Results for the exchange energy verify the formula of Herring and Flicker [Phys. Rev. {\bf 134}, A362 (1964)] for the large internuclear distance asymptotics. The presented analytic approach to Slater integrals opens a window for the high precision calculations in an arbitrary diatomic molecule.Comment: 14 pages, 5 tables, 1 figure, corrected numeric

Crossmodal spatial location: initial experiments

This paper describes an alternative form of interaction for mobile devices using crossmodal output. The aim of our work is to investigate the equivalence of audio and tactile displays so that the same messages can be presented in one form or another. Initial experiments show that spatial location can be perceived as equivalent in both the auditory and tactile modalities Results show that participants are able to map presented 3D audio positions to tactile body positions on the waist most effectively when mobile and that there are significantly more errors made when using the ankle or wrist. This paper compares the results from both a static and mobile experiment on crossmodal spatial location and outlines the most effective ways to use this crossmodal output in a mobile context

Mobility of organic pollutants in soil components. What role can magic angle spinning NMR play ?

International audienceThe adsorption-desorption mechanisms at the interface between organic and inorganic soil colloids influence the movement of pesticides and hence their bioavailability and biotransformation processes. Direct analyses of soils have been reported in the literature with the use of solid-state nuclear magnetic resonance (NMR) spectroscopy on dry samples. We recently demonstrated the potential of the 1H high resolution magic angle spinning (MAS) NMR technique to study such mechanisms in situ on highly hydrated samples. By using a well-characterized soil model, it was possible to distinguish the mobile and immobile pesticide unambiguously. In the present communication, a short review of MAS NMR techniques that allow covalent and non-covalent bond analysis is provided. The results obtained in our group on the adsorption of some pollutants such as phosphonomethylglycine (glyphosate), MCPA and 2-benzothiazole sulphonate are also presented. Specifically, we focus on the potential of MAS NMR spectroscopy for probing the behaviour (mobility) of these organic pollutants loaded onto the surface of different clays. The influence of clay hydration on NMR spectra has also been evaluate

Transformative Learning as a Theoretical Field

The phenomenon of change, of transformation, is just as relevant today as it was in the seventies when the concept of transformative learning was first developed. One might even argue that transformation has gained even more significance globally. This journal issue is a timely inquiry into the current state of its theoretical development, and we are grateful for the opportunity to respond to the questions posed by the editors