Whether every effect can be precisely linked to a given cause or to a list of causes has been a matter of debate for centuries, particularly during the 17th century, when astronomers became capable of predicting the trajectories of planets. Recent mathematical models applied to physics have included the idea that given phenomena cannot be predicted precisely, although they can be predicted to s...

After a brief introduction to the necessary of quark stars in modelling pulsars, I present a qualitative analysis of the solidification of quark matter with low-temperature but high-density. The reason, that a solid neutron star could not be possible, is also given. Subject headings: pulsars: general — stars: neutron — elementary particles What’s the nature of pulsars? This question seems to ha...

Vector-valued electromagnetic waves for which the integral of electric field over time is zero at every location in space were characterized as “usual” by Bessonov several decades ago. Otherwise, they called “strange”. Recently, Popov and Vinogradov studied conditions leading to usual using a spectral representation. Their main result that pulses finite energy free are and, consequently, bipola...

It is commonplace for organisations to collect personal information to be processed and stored on their systems. Until recently, there was no comprehensive legislation that addressed the ‘processing’ of personal information by organisations in South Africa. The Protection of Personal Information Bill (“POPI”) was signed into law in November 2013 and is expected to come into effect, later this y...