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Many-body system with a four-parameter family of point interactions in one dimension
We consider a four-parameter family of point interactions in one dimension.
This family is a generalization of the usual -function potential. We
examine a system consisting of many particles of equal masses that are
interacting pairwise through such a generalized point interaction. We follow
McGuire who obtained exact solutions for the system when the interaction is the
-function potential. We find exact bound states with the four-parameter
family. For the scattering problem, however, we have not been so successful.
This is because, as we point out, the condition of no diffraction that is
crucial in McGuire's method is not satisfied except when the four-parameter
family is essentially reduced to the -function potential.Comment: 8 pages, 4 figure
Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
Resistivity, magnetic susceptibility and heat capacity measurements are
reported for single crystals of Fe1+yTexSe1-x grown via a modified Bridgeman
method with 0 < y < 0.15, and x= 1, 0.9, 0.75, 0. 67, 0.55 and 0.5. Although
resistivity measurements show traces of superconductivity near 14 K for all x
except x=1, only crystals grown with compositions near x=0.5 exhibit bulk
superconductivity. The appearance of bulk superconductivity correlates with a
reduction in the magnitude of the magnetic susceptibility at room temperature
and smaller values of y, the concentration of Fe in the Fe(2) site.Comment: Submitted to Phys. Rev.
Towards an understanding of the contribution of global learning to the wellbeing and mental health of young people with special educational needs
The aim of this study was to explore the possible impact of global learning interventions on students’ mental health and wellbeing. The study employed a mixed methods design, which consisted of student (N11) and teacher (N4) interviews, as well as a mental health and wellbeing questionnaire. The participants of this study all attended an autistic specific secondary school that served as a Global Learning Programme Expert Centre. The findings of the study indicated that students who participated in lessons that had a global learning focus, experienced a small but significant improvement in mental health and wellbeing. This small-scale study may lead to more extensive research in the area
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