Echolocation signal structure in the Megachiropteran bat Rousettus aegyptiacus Geoffroy 1810

Rousettus aegyptiacus Geoffroy 1810 is a member of the only genus of Megachiropteran bats to use vocal echolocation, but the structure of its brief, click-like signal is poorly described. Although thought to have a simple echolocation system compared to that of Microchiroptera, R. aegyptiacus is capable of good obstacle avoidance using its impulse sonar. The energy content of the signal was at least an order of magnitude smaller than in Microchiropteran bats and dolphins (approximately 4 X 10(-8) J m(-2)). Measurement of the duration, amplitude and peak frequency demonstrate that the signals of this animal are broadly similar in structure and duration to those of dolphins. Gabor functions were used to model signals and to estimate signal parameters, and the quality of the Gabor function fit to the early part of the signal demonstrates that the echolocation signals of R. aegyptiacus match the minimum spectral spread for their duration and amplitude and are thus well matched to its best hearing sensitivity. However, the low energy content of the signals and short duration should make returning echoes difficult to detect. The performance of R. aegyptincus in obstacle avoidance experiments using echolocation therefore remains something of a conundrum.

Reading Elizabeth Bishop's "Artifact of [Words]"

As Emerson noted in his essay 'The Poet' "we are not pans and barrows, not even porters of the fire and torch-bearers, but children of the fire, made of it, and only the same divinity transmuted, and at two or three removes, when we least know about it." For Emerson, the fire is poetry, an elemental force capable of transmutation, transformation and enduring relevance. Moving from Emerson, Elizabeth Bishop rises as the twentieth-century poet most aligned with the possibility of poetry and the powers of its practice, as 'At The Fishhouses' indicates in her clear referencing of Emerson:

"If you should dip your hand in,
your wrist would ache immediately,
your bones would begin to ache and your hand would burn
as if the water were a transmutation of fire
that feeds on stones and burns with a dark gray flame."

This essay will look in detail at Bishop's understanding of the possibility of poetry and how art functions as a multi-dimensional structure that is unsettled as much as it unsettles. In particular, Bishop's poem 'The Monument' will be unpicked as testament both to the practice of Bishop's art and also the role of the poet critic responding to what they uncover

An anthropometric history of the World, 1810-1980: did migration and globalization influence country trends?

We find that regional height levels around the world were fairly uniform throughout most of the 19th century, with two exceptions: above-average levels in Anglo-Saxon settlement regions and below-average levels in Southeast Asia. After 1880, substantial diver- gences began to differentiate other regions -- making the world population taller, but more unequal. During the late 19th century and 20th century, heights between world regions devi- ated significantly, when incomes also became very unequal. Interestingly, during the “breaking point period” between the two regimes, heights declined significantly in the cattle-rich New World countries, whereas they started to increase in Old Europe. We discuss in this study whether immigration was a core factor to influence the height decline in the “Anthropometric Decline of the Cowboy and Gaucho Empires”.

Commentary on Gyles v. Wilcox (1741)

Case in which Lord Hardwicke introduces the concept of the ‘fair abridgement', and which is generally regarded as the forerunner to the broader doctrine of ‘fair use' developed in the courts throughout the nineteenth century. The document includes two different reports of the decision, as well as an essay by Samuel Johnson on the right to abridge an author's work.
The commentary describes the background to the case, in particular the nature of periodical publication throughout the eighteenth century, the rise of the magazine format in the 1730s, as well as relevant case-law both prior to, and following, the decision. The commentary suggests that while the decision in Gyles can be understood as one guided by public interest arguments similar to those informing the rationale behind the Statute of Anne 1710 (that is, the encouragement of learning and production of useful books) (uk_1710), it can equally be regarded as one in which the court, in effect, expanded the rights of the copyright owner beyond the protections provided by the legislation.

Commentary on Pope v. Curl (1741)

Decision of the Chancery Court concerning the unpublished correspondence of Alexander Pope, in which Lord Chancellor Hardwicke draws a distinction between the ownership of a letter, as a physical document, and the right to authorise the first publication of that letter, a right which he concludes remains with the author of the same.
Drawing upon the Public Records Office Archives the commentary explores the background to, and substance of, the decision, the nature and significance of epistolary correspondence in eighteenth century society, and subsequent related commentary and case-law. The commentary argues that the decision is of particular significance in the development of the concept of the author's text as intangible property.