Interactions and particles in the standard model are characterized by the action of internal and external symmetry groups. The four symmetry regimes involved are related to each other in the context of induced group representations. In addition to Wigner’s induced representations of external Poincaré group operations, parametrized by energy-momenta, and the induced internal hyperisospin represe...

Knowledge representation, defined as the way individuals structure their knowledge and cognitive processing of events and the associated sense-making processes, is believed to influence teachers’ reasoning/thinking skills. While extensively researched in mainstream teacher education, this line of inquiry is essentially lacking in the L2 teacher education literature. To fill some of the void, th...

Using the formalism of Hamaker et al. (1996), I derive a method for the polarization calibration of observations made with a single radio telescope. This method is particularly appropriate for observations of pulsars, where the sign and magnitude of the circular polarization are useful for understanding the emission processes at work. I apply the method to observations of PSR J1359–6038 made us...

Densities in molten KCl, RbCI, T1C1, KC1-T1C1 and RbCl -TlCl at various temperatures (t °C) were measured to within ±0.1% by iridium pyknometry. For the pure melts the results fit empirical equations of the form Q=a—bt . The molar volumes at the melting points were derived and tested against other melting-point data for thermodynamic consistency. In the mixtures the volumes deviate from additiv...