On a mechanism for enhancing magnetic activity in tidally interacting binaries

We suggest a mechanism for enhancing magnetic activity in tidally interacting binaries. We suppose that the deviation of the primary star from spherical symmetry due to the tidal influence of the companion leads to stellar pulsation in its fundamental mode. It is shown that stellar radial pulsation amplifies torsional Alfv{\'e}n waves in a dipole-like magnetic field, buried in the interior, according to the recently proposed swing wave-wave interaction (Zaqarashvili 2001). Then amplified Alfv{\'e}n waves lead to the onset of large-scale torsional oscillations, and magnetic flux tubes arising towards the surface owing to magnetic buoyancy diffuse into the atmosphere producing enhanced chromospheric and coronal emission.Comment: Accepted in Ap

Comparison between REBT and Visual/Kinaesthetic Dissociation in the Treatment of Panic Disorder: An Empirical Study

The aim of this study was to test the efficacy of two brief treatment methods for panic disorder: Rational Emotive Behaviour Therapy (REBT) and Visual/Kinaesthetic Dissociation (VKD), neither of which have been the object of scientific enquiry. The study is a two-way between-groups pre-test/post-test experimental design with baseline and follow-up measures. An innovative four-session treatment protocol was developed for each treatment method. Eighteen participants in North-East Surrey, England, who responded to media advertisements for cognitive-behavioural treatment for panic disorder and who met Diagnostic and Statistical Manual of Mental Disorders criteria for panic disorder with or without agoraphobia were randomly assigned to either REBT or VKD. Pre-test/post-test changes in panic were measured using the ACQ, PASQ, and HADS scales and a global panic rating measure. At post-test there was a statistically significant improvement on all measures for both groups, which was maintained at one-month follow-up. Taking into consideration limitations such as the small sample size and a short follow-up period, implications of this study and recommendations for future research are discussed

Surveying the technology landscape: Teachers' use of technology in secondary mathematics classrooms

For many years, education researchers excited by the potential for digital technologies to transform mathematics teaching and learning have predicted that these technologies would become rapidly integrated into every level of education. However, recent international research shows that technology still plays a marginal role in mathematics classrooms. These trends deserve investigation in the Australian context, where over the past 10 years secondary school mathematics curricula have been revised to allow or require use of digital technologies in learning and assessment tasks. This article reports on a survey of mathematics teachers' use of computers, graphics calculators, and the Internet in Queensland secondary schools, and examines relationships between use and teachers' pedagogical knowledge and beliefs, access to technology, and professional development opportunities. Although access to all forms of technology was a significant factor related to use, teacher beliefs and participation in professional development were also influential. Teachers wanted professional development that modelled planning and pedagogy so they could meaningfully integrate technology into their lessons in ways that help students learn mathematical concepts. The findings have implications not only for resourcing of schools, but also for designing professional development that engages teachers with technology in their local professional contexts. [Author abstract

BANDES SATELLITES DES RAIES D'ÉLECTRONS DE CONVERSION INTERNE

Comparaison des bandes satellites expérimentales dans les spectres de conversion interne avec les calculs théoriques, sur la base de variations de l'énergie de liaison calculées, en fonction de la charge, par une méthode H-F-S relativiste. Mesures comparatives de la période de l'état excité de 59,5 keV du neptunium 237 dans le cas d'atomes peu et très ionisés.Comparison of experimental satellite bands in conversion electron spectra with theoretical calculations, based on the binding energy variations calculated as a function of atom ionization with a relativistic H-F-S method. Experimental relative measurements of a nuclear level period in neptunium 237 have been performed in the cases of neutral and heavily charged atoms

EFFETS DU RECUL ALPHA EN CONVERSION INTERNE

Interprétation des déformations des lignes de conversion émises par des atomes subissant un recul alpha dans un champ électrique.Interpretation of deformations of conversion lines emitted by atoms recoiling after alpha emission in an electric field

ÉTUDE DES NIVEAUX DE 220Fr, 219Fr, 216At ET 215At

Résultats de spectrométrie α pour 224Ac 27 raies, 223Ac 25 raies, 220Fr 15 raies, 219Fr 6 raies.α spectrometry of 224Ac, 223Ac and daughter products 220Fr and 219Fr shows respectively : 27 lines, 25 lines, 15 lines, 6 lines