Students' epistemological framing in quantum mechanics problem solving

Students' difficulties in quantum mechanics may be the result of unproductive framing and not a fundamental inability to solve the problems or misconceptions about physics content. We observed groups of students solving quantum mechanics problems in an upper-division physics course. Using the lens of epistemological framing, we investigated four frames in our observational data: algorithmic math, conceptual math, algorithmic physics, and conceptual physics. We discuss the characteristics of each frame as well as causes for transitions between different frames, arguing that productive problem solving may occur in any frame as long as students' transition appropriately between frames. Our work extends epistemological framing theory on how students frame discussions in upper-division physics courses.Comment: Submitted to Physical Review -- Physics Education Researc

The Watlington hoard: coinage, kings and the Viking Great Army in Oxfordshire, AD875-880

Presenting the complete publication of the objects and coins in the Watlington Hoard, the authors discuss its wider implications for our understanding of hoarding in late 9th-century southern Britain, interactions between the kingdoms of Wessex and Mercia, and the movements of the Viking Great Army after the Battle of Edington in 878. The Watlington Hoard was discovered in southern Oxfordshire in 2015 by a metal-detectorist, and acquired by the Ashmolean Museum, Oxford in 2017. A nationally-important find of coinage and metalwork, and the first major Viking-Age hoard from the county, it dates from the late 870s, a fundamental and tumultuous period in Britain’s history. The contents of the hoard include a highly significant collection of over 200 silver pennies, mostly of Alfred the Great, king of Wessex, and Ceolwulf II, king of Mercia, transforming our understanding of the coinage in this period, and 23 silver and gold pieces of contemporary metalwork much of which was derived from Scandinavia. Presenting the complete publication of the objects and coins in the Watlington Hoard – including an important re-assessment of the coinage of the late 870s – the authors discuss its wider implications for our understanding of hoarding in late 9th-century southern Britain, interactions between the kingdoms of Wessex and Mercia, and the movements of the Viking Great Army after the Battle of Edington in 878. The book also relates another side to the hoard’s story, beginning with its discovery and excavation, charting its path through the conservation work and acquisition by the Ashmolean Museum to the public outreach projects which ran alongside the scholarly research into the hoard

ACTH and polymorphisms at steroidogenic loci as determinants of aldosterone secretion and blood pressure

The majority of genes contributing to the heritable component of blood pressure remain unidentified, but there is substantial evidence to suggest that common polymorphisms at loci involved in the biosynthesis of the corticosteroids aldosterone and cortisol are important. This view is supported by data from genome-wide association studies that consistently link the CYP17A1 locus to blood pressure. In this review article, we describe common polymorphisms at three steroidogenic loci (CYP11B2, CYP11B1 and CYP17A1) that alter gene transcription efficiency and levels of key steroids, including aldosterone. However, the mechanism by which this occurs remains unclear. While the renin angiotensin system is rightly regarded as the major driver of aldosterone secretion, there is increasing evidence that the contribution of corticotropin (ACTH) is also significant. In light of this, we propose that the differential response of variant CYP11B2, CYP11B1 and CYP17A1 genes to ACTH is an important determinant of blood pressure, tending to predispose individuals with an unfavourable genotype to hypertension

Stochastic Reserve Losses: A Rejoinder

In an article in the September, 1961, issue of the A.merican Economic Review, Daniel Orr and W. G. Mellon introduced the notion of uncertainty into the well-known comparative static analysis of bank credit expansion. (1) This paper discusses their findings, the nature of their assumptions, and some possible extensions of their results

Stochastic Reserve Losses

In an article in the September, 1961, issue of the A.merican Economic Review, Daniel Orr and W. G. Mellon introduced the notion of uncertainty into the well-known comparative static analysis of bank credit expansion. (1) This paper discusses their findings, the nature of their assumptions, and some possible extensions of their results

A tale of two ladies : Pink Lady and Sundowner

It is five years since the first Western Australianbred Pink Lady and Sundowner apples were sold on the local market. In that time, these crisp, sweet flavoursome apples have become top-selling, premium fruit. The story is no different overseas. Trial shipments to London, Taiwan and Singapore have indicated a big demand for the unique Pink Lady apple - far more than Western Australia can presently supply. One million fruiting Pink Lady apple trees are needed to meet anticipated export sales. Today, there are only 100,000 trees in the ground, of which about half are bearing fruit. New high quality apple varieties are Australia\u27s only hope of re-entering export markets on a large and sustained scale at profitable price