Although at first sight the Speculum contains ‘too little Augustine’ for theologians who are attempting to discover the originality of this thought, it is in fact a revealing anthology. An examination of the criteria used for the selection of Scriptural quotations brings to light an important facet of his mystagogy. Both the exclusion and inclusion criteria demonstrate that Augustine’s intention is to confront his reader with his own imperfections, and this to a much greater degree than is suggested by the (...) understatement of Speculum 108 that the moral guidelines proffered should have an immediate impact. Augustine’s aim in writing the Speculum is to effect a confrontation of the reader with himself, in a first, but permanent step on the way of mystagogy. Scripture serves as a mirror to reflect as detailed and unpolished an image as possible of the person who looks into it; the confrontation must be as violent as possible. (shrink)

We apply an online optimization process based on machine learning to the production of Bose-Einstein condensates. BEC is typically created with an exponential evaporation ramp that is optimal for ergodic dynamics with two-body s-wave interactions and no other loss rates, but likely sub-optimal for real experiments. Through repeated machine-controlled scientific experimentation and observations our ’learner’ discovers an optimal evaporation ramp for BEC production. In contrast to previous work, our learner uses a Gaussian process to develop a statistical model of the (...) relationship between the parameters it controls and the quality of the BEC produced. We demonstrate that the Gaussian process machine learner is able to discover a ramp that produces high quality BECs in 10 times fewer iterations than a previously used online optimization technique. Furthermore, we show the internal model developed can be used to determine which parameters are essential in BEC creation and which are unimportant, providing insight into the optimization process of the system. (shrink)

Several important ethical dilemmas emerge when nurses join a public-sector strike. Such industrial action is commonplace in South Africa and was most notably illustrated by a national wage negotiation in 2010. Media coverage of the proceedings suggested unethical behaviour on the part of nurses, and further exploration is merited. Laws, policies and provisional codes are meant to guide nurses’ behaviour during industrial action, while ethical theories can be used to further illuminate the role of nurses in industrial action. There are, (...) however, important aspects to consider before judging whether nurses act unethically when striking. Following Loewy’s suggestion that the nature of the work, the proceeding commitment of the nurse to the patient, the prevailing situation when the strike is planned and the person(s) who stand(s) to benefit from the strike be considered, coupled with a consideration of the South African historical socio-political context, important aspects of the ethics of nurses’ behaviour in industrial action transpire. (shrink)