9 resultados para Dow, Harriet, 1810-1823.
Resumo:
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.
Resumo:
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”.
Resumo:
This book examines fictional representations of India in novels, plays and poetry produced between the years 1772 to 1823 as historical source material. It uses literary texts as case studies to investigate how Britons residing both in the metropole and in India justified, confronted and imagined the colonial encounter during this period. The study will situate the texts in relation to the shifting colonial context and to the changing attitudes towards India within Britain in general and on the part of Britons who had experience of living in India, such as East India Company men or their wives and daughters, in particular. Moreover, it will analyse how this literature responded to the increasing influence of the subcontinent on metropolitan culture. This book, then, approaches fictional texts as case studies that illuminate trends taking place within Britain such as the growing consumption of Indian-style imported goods and the commoditisation of an Indian aesthetic within British visual culture. Whilst the book will utilise fictional portrayals to comment upon shifts in the relationship between coloniser and colonised and to discuss the cross-cultural influences between the metropole and the colonial periphery, it also outlines how literary production and print capitalism played a part in shaping depictions of the subcontinent and stereotypes of the colonial 'other'. The study will also examine how representations of the subcontinent in British art and scholarship were influenced by metropolitan literary and popular culture. At the same time it will look at how representations by metropolitan authors influenced early-nineteenth century depictions by British authors who resided in India.