Over the last two centuries, logging has caused major, but unquantified, compositional and structural changes in the southern portion of the North American boreal forest. In this study, we used a series of old forest inventory maps coupled with a new dendrochronological approach for analyzing timber floating histories in order to document the long-term transformation (1820–2000) of a southern b...

The iron depletion level and the gas-phase iron abundance in the hot (∼ 106 K) interstellar medium (ISM) are critical to our understanding of its energy balance as well as the thermal sputtering, cooling, and heating processes of dust grains. Here we report on the first detection of the Fe XVII absorption line at 15.02 Å from the hot ISM in the spectrum of the low mass X-ray binary 4U 1820–303 ...

O presente estudo pretende analisar as despesas da Câmara Municipal de Coimbra, entre 1762 e 1820. Trata-se um período grandes dificuldades para a gestão camarária coimbrã, que levou algumas alterações significativas na forma arrecadar receitas, o permitiu crescimento dos gastos. Com recurso uma metodologia quantitativa comparativa, aspira-se, com esta investigação, compreender em medida compos...

W. J. O'CONNOR, Founders of British physiology: a biographical dictionary, 1820-1885, Manchester University Press, 1988, 8vo, pp. ix, 278, £27.50. Obituaries make compelling reading and anyone with an interest in the history of physiology will welcome the appearance of Dr O'Connor's collection of 135 brief lives. He has selected them on the basis of their connection with physiology between 1820...

We present the results of a study with the Swift Burst Alert Telescope in the 14 – 195 keV range of the long-term variability of 5 low mass X-ray binaries with reported or suspected super-orbital periods — 4U 1636-536, 4U 1820-303, 4U 1916-053, Cyg X-2 and Sco X-1. No significant persistent periodic modulation was detected around the previously reported periods in the 4U 1916-053, Cyg X-2 or Sc...