The prompt energy release of gamma-ray bursts using a cosmological k-correction

The fluences of gamma-ray bursts (GRBs) are measured with a variety of instruments in different detector energy ranges. A detailed comparison of the implied energy releases of the GRB sample requires, then, an accurate accounting of this diversity in fluence measurements which properly corrects for the redshifting of GRB spectra. Here, we develop a methodology to ``k-correct'' the implied prompt energy release of a GRB to a fixed co-moving bandpass. This allows us to homogenize the prompt energy release of 17 cosmological GRBs (using published redshifts, fluences, and spectra) to two common co-moving bandpasses: 20-2000 keV and 0.1 keV-10 MeV (``bolometric''). While the overall distribution of GRB energy releases does not change significantly by using a k-correction, we show that uncorrected energy estimates systematically undercounts the bolometric energy by ~5% to 600%, depending on the particular GRB. We find that the median bolometric isotropic-equivalent prompt energy release is 2.2 x 10^{53} erg with an r.m.s. scatter of 0.80 dex. The typical estimated uncertainty on a given k-corrected energy measurement is ~20%.Comment: Accepted to the Astronomical Journal. 21 pages (LaTeX) and 4 figure

Greek at Chartres

This study of the so-called Headmaster of the West Portals of Chartres Cathedral attempts to demonstrate that this sculptor was probably a Greek, as suggested by Revoil. First, it describes the present setting of the West Portals, and reviews the evidence for their change in location. Next, it distinguishes between the hand of the Head Master and those of his associates in the carving of the column figures of all three doorways, and describes his illusionistic use of low relief and a form of linear projection in the Maiestas Domini of the central tympanum. A brief demonstration of the difference between the Head Master\u27s system of projection and that of the Italian Renaissance leads to a reconstruction of the original order of the column figures of the Central Doorway, and of the geometric basis of the Maiestas Domini in the tympanum above them. In turn this leads to an interpretation of the whole doorway as the story of Christ\u27s royal ancestry, a theme repeated in abbreviated form in the royal doors of other churches in France. A case is made for identifying the Head Master as a Greek, on the basis of his use of low relief to convey the impression of volume without mass, as found in Byzantine ivory carving of the Second Golden Age. Also, his use of cycloramic projection shows a familiarity with Euclid\u27s Optica, a closed book to all but a learned few in the West before the middle of the twelfth century. The impact of the Headmaster\u27s Royal Portal on the portals of other cathedrals in France is demonstrated by comparisons with the examples of Le Mans and Bourges

Women's experiences of pregnancy, childbirth, and the postnatal period in the Gambia: A qualitative study

Objective: In sub-Saharan African countries, there are unique cultural factors and adverse physical conditions that contribute to women's experiences of pregnancy and birth. The objective of this study was to qualitatively explore women's experiences of pregnancy, childbirth, the postnatal period, and maternal psychological distress in The Gambia. Design and methods: Semi-structured interviews were carried out with 55 women who had given birth within the previous year. Results: Thematic analysis identified five themes: (1) transition to adulthood, (2) physical difficulties, (3) value of children in relation to others, (4) children as a strain, and (5) going through it alone. The results suggest that having a child is a defining point in women's lives associated with happiness and joy. However, women also described situations which could lead to unhappiness and distress in the perinatal period. A child conceived out of wedlock or a baby girl can be sources of distress because of negative cultural perceptions. The strain of having a child, particularly the additional financial burden, and minimal support from men were also a concern for women. Finally, women recognized the danger associated with delivery and expressed recurrent worries of complications during childbirth which could result in the death of them or the baby. Conclusions: Further research is needed to identify women vulnerable to psychological distress so that health services and target interventions can be developed accordingly

To edit or not to edit? Why is editing academic collections not recognised in the Humanities?

Edited academic books garner neither research metric nor institutional praise, compared to peer reviewed journal articles or monographs. For the editor, there seems no reason to undertake such volumes. But we still do them; we still edit or co-edit them. Louise Edwards claims there are many good reasons why academics persist in editing (and reading) this type of academic output, her prime one being that they ‘meet a series of distinct intellectual and community needs’ (Edwards 2012: 62). This paper brings together two academics who have both contributed to and edited or co-edited such volumes. The scope of the paper is their experiences in editing and co-editing, in order to open up a discussion about the worth of such volumes: why, despite the university’s reluctance to recognise them as either creative or research outputs, academics continue to regard editing as a meaningful scholarly pursuit; and importantly, as we clearly do value these undertakings, how can institutional attitudes to their merit be changed? The co-authors discuss their own personal ethos and experiences about editing and co-editing these texts. This paper stems from a panel at the 2017 AAWP conference, an open dialogue with the audience facilitated by a collegial interlocutor, Dr Carolyn Rickett, herself a co-editor of books

THE EFFECTS OF INDUSTRY STRUCTURE ON PRICE: A CASE IN THE BEEF INDUSTRY

This study estimates the influence of concentration and other structural variables on the price of slaughter cattle. Cross-sectional data were used to estimate a single equation model which included, in addition to traditional factor demand variables, packer concentration and a measure of market power exerted by feedlots. Results suggest that packer concentration has had a significant and increasing negative impact on fed cattle prices during the years of analysis, 1972 and 1977.Industrial Organization, Livestock Production/Industries,

Bowen ratio estimates of evapotranspiration for stands on the Virgin River in Southern Nevada

A Bowen ratio energy balance was conducted over a Tamarix ramosissima (saltcedar) stand growing in a riparian corridor along the Virgin River in southern Nevada. Measurements in two separate years were compared and contrasted on the basis of changes in growing conditions. In 1994, a drought year, record high temperatures, dry winds, and a falling water table caused partial wilt of outer smaller twigs in the canopy of many trees in the stand around the Bowen tower. Subsequently, evapotranspiration (ET) estimates declined dramatically over a 60‐day period (11 mm d−1 tod−1). In 1995, the Virgin River at the Bowen tower area changed its course, hydrologically isolating the Tamarix stand in the vicinity of the tower. In 1996, a 25% canopy loss was visually estimated for the Tamarix growing in the area of the tower. Higher soil temperatures relative to air temperatures were recorded in 1996 in response to this loss in canopy. With a more open canopy, thermally induced turbulence was observed in 1996. On day 160 of 1996, a 28°C rise over a 9‐hour period was correlated with increased wind speeds of greater than 4 m s−1. Subsequently, higher ET estimates were made in 1996 compared to 1994 (145 cm versus 75 cm). However, the energy balance was dominated by advection in 1996, with latent energy flux exceeding net radiation 65% of the measurement days compared to only 11% in 1994. We believe this advection was on a scale of the floodplain (hundreds of meters) as opposed to regional advection, since the majority of wind (90%) was in a N–S direction along the course of the river, and that a more open canopy allowed the horizontal transfer of energy into the Tamarix stand at the Bowen tower. Our results suggest that Tamarix has the potential to be both a low water user and a high water user, depending on moisture availability, canopy development, and atmospheric demand, and that advection can dominate energy balances and ET in aridland riparian zones such as the Virgin River

The Installment Land Contract--A National Viewpoint

The installment land contract is rarely used in some states, but in many it is the predominant means of vendor financing of land sales. Much has been written about it, but nearly all of the literature focuses on the law of one particular state or another. Our purpose here is to provide a nationwide perspective, with particular attention to the states in which the contract has been widely used and extensively litigated. We propose to examine the reasons for the installment contract\u27s popularity, its advantages and disadvantages, and the risks it presents to both vendor and purchaser