IN the heroic Latin hexameter, after the essential alternation of long and short syllables, by far the most important feature is unquestionably the caesura. Nevertheless, ancient writers on metre dismiss it with the most cursory notice; all we get from them is that the chief caesura is the penthemimeral, the trochaic and hephthemimeral coming next; the fourth trochaic and the bucolic are usually rejected, and the trihemimeral is mentioned only by Ausonius, Modern writers, among whom are Müller and Winbolt, deal (...) with the question at greater length, but do not agree even on fundamental points, and often base their statements on an insufficient analysis of the extant remains of Latin hexameter verse. The purpose of the following paper is to attempt a more complete analysis, at least in the case of Virgil, the acknowledged master of the Latin hexameter. But before we proceed further there are two preliminaries which must be settled—what are the main types of caesura, and how many caesurae are admissible in one verse? (shrink)

The advances in treatment of HIV and the introduction of polymerase chain reaction assay for the virus now make it acceptable for HIV discordant couples where the male partner is seropositive to attempt to conceive through artificial insemination by husband (AIH) or via in vitro fertilisation. With undetectable viral load and washed sperm, there is minimal risk of transmission of HIV to the female partner, children, other patients, or staff. We describe the development of a programme of AIH for HIV (...) discordant couples and the reasoning behind offering such a programme. (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)

It is a truism to say that the study of ornithology has made great advances in the last fifty years, and that important problems affecting the classification of certain species and their distribution have been brought much closer to solution. Classical scholars, however, still tend to rely on the identifications of ancient Greek bird-names made by a few standard works such as D'Arcy Thompson's A Glossary of Greek Birds2 or O. Keller's Die antike Tierwelt , apparently unaware that much of (...) the ornithological information given there is now badly out of date, if not sheerly inaccurate. This brief paper aims protreptically to take four bird-names out of the Peripatetic corpus on natural history: and and to produce more precise identifications in the light of modern ornithological studies. (shrink)