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Debates in geography education
No full textDebates considered include:•What constitutes knowledge in geography?•Constructing the curriculum;•How do we link assessment to making progress in geography?•The contribution of fieldwork and outdoor experiences;•Technology and media;•How we use Geographical Information;•How geography contributes to ‘global learning’;•Sustainable development and geography education.The comprehensive, rigorous coverage of these key issues, together with carefully annotated selected further reading, reflective questions and a range of specific web-based resources, will help support shape your own research and writing. Debates in Geography Education is a source of knowledge, experience and debate that will be essential reading for all students studying at Masters level, practising teachers who want to develop a better understanding of the issues that shape their practice, and Education Studies students considering in-depth subject teaching
Debates in Geography Education
No full textebates in Geography Education encourages early career teachers, experienced teachers and teacher educators to engage with and reflect on key issues, concepts and debates. It aims to enable readers to reach their own informed judgements with deeper theoretical knowledge and understanding.The second edition is fully updated in light of the latest research, policy and practice in the field, as well as key changes to the curriculum and examination specifications. Expert contributors provide a range of perspectives on international, historical and policy contexts in order to deepen our understanding of significant debates in geography education.Key debates include:geography's identity as an academic discipline;what constitutes knowledge in geography;places and regional geography;what it means to think geographically;constructing the curriculum;how we link assessment to making progress in geography;the contribution of fieldwork and outdoor experiences;technology and the use of Geographical Information;school geography and employability;understanding the gap between school and university geography;evidence-based practice and research in geography education
Lambert David, Notables des colonies. Une élite de circonstance en Tunisie et au Maroc (1881-1939)
No full textDroz Bernard. Lambert David, Notables des colonies. Une élite de circonstance en Tunisie et au Maroc (1881-1939). In: Outre-mers, tome 97, n°366-367, 1er semestre 2010. Images et pouvoirs dans le Pacifique, sous la direction de Viviane Fayaud et Jean-Marc Regnault . pp. 344-345
Lambert David, Notables des colonies. Une élite de circonstance en Tunisie et au Maroc (1881-1939)
No full textDroz Bernard. Lambert David, Notables des colonies. Une élite de circonstance en Tunisie et au Maroc (1881-1939). In: Outre-mers, tome 97, n°366-367, 1er semestre 2010. Images et pouvoirs dans le Pacifique, sous la direction de Viviane Fayaud et Jean-Marc Regnault . pp. 344-345
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Atmospheric Composition Of Weak G Band Stars: CNO And Li Abundances
Full text linkWe determined the chemical composition of a large sample of weak G band stars-a rare class of G and K giants of intermediate mass with unusual abundances of C, N, and Li. We have observed 24 weak G band stars with the 2.7 m Harlan J. Smith Telescope at the McDonald Observatory and derived spectroscopic abundances for C, N, O, and Li, as well as for selected elements from Na-Eu. The results show that the atmospheres of weak G band stars are highly contaminated with CN-cycle products. The C underabundance is about a factor of 20 larger than for normal giants and the C-12/C-13 ratio approaches the CN-cycle equilibrium value. In addition to the striking CN-cycle signature the strong N overabundance may indicate the presence of partially ON-cycled material in the atmospheres of the weak G band stars. The exact mechanism responsible for the transport of the elements to the surface has yet to be identified but could be induced by rapid rotation of the main sequence progenitors of the stars. The unusually high Li abundances in some of the stars are an indicator for Li production by the Cameron-Fowler mechanism. A quantitative prediction of a weak G band star's Li abundance is complicated by the strong temperature sensitivity of the mechanism and its participants. In addition to the unusual abundances of CN-cycle elements and Li, we find an overabundance of Na that is in accordance with the NeNa chain running in parallel with the CN cycle. Apart from these peculiarities, the element abundances in a weak G band star's atmosphere are consistent with those of normal giants.Robert A. Welch Foundation F-634Astronom
Isotopic Titanium Abundances In Local M Dwarfs
Full text linkRelative abundances of the five stable isotopes of titanium (Ti-46 to Ti-50) are measured for 11 M dwarfs belonging to the thin disk (four stars), thick disk (three stars), the halo (one star), and either the thick or the thin disk (three stars). Over the metallicity range of the sample (-1 < [Fe/H] < 0), the isotopic ratios are approximately constant at the solar system ratios. There is no discernible difference between the isotopic ratios for thin and thick disk stars. Isotopic ratios are in fair accord with recent calculations of Galactic chemical evolution despite the fact that such calculations underpredict [Ti/Fe] by about 0.4 dex at all metallicities.Robert A. Welch Foundation of Houston, TexasAstronom
Carbon And Oxygen Abundances Across The Hertzsprung Gap
Full text linkWe derived atmospheric parameters and spectroscopic abundances for C and O for a large sample of stars located in the Hertzsprung gap in the Hertzsprung-Russell diagram in order to detect chemical peculiarities and get a comprehensive overview of the population of stars in this evolutionary state. We have observed and analyzed high-resolution spectra (R = 60,000) of 188 stars in the mass range 2-5M(circle dot) with the 2.7 m Harlan J. Smith Telescope at the McDonald Observatory including 28 stars previously identified as Am/Ap stars. We find that the C and O abundances of the majority of stars in the Hertzsprung gap are in accordance with abundances derived for local lower-mass dwarfs but detect expected peculiarities for the Am/Ap stars. The C and O abundances of stars with T-eff < 6500 K are slightly lower than for the hotter objects but the C/O ratio is constant in the analyzed temperature domain. No indication of an alteration of the C and O abundances of the stars by mixing during the evolution across the Hertzsprung gap could be found before the homogenization of their atmospheres by the first dredge-up.Robert A. Welch Foundation of Houston, Texas F-634McDonald Observator
Alien Registration- Lambert, David G. (Robbinston, Washington County)
Full text linkhttps://digitalmaine.com/alien_docs/1413/thumbnail.jp
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The Distribution Of The Elements In The Galactic Disk. III. A Reconsideration Of Cepheids From L=30 Degrees To 250 Degrees
No full textThis paper reports on the spectroscopic investigation of 238 Cepheids in the northern sky. Of these stars, about 150 are new to the study of the galactic abundance gradient. These new Cepheids bring the total number of Cepheids involved in abundance distribution studies to over 400. In this work, we also consider systematics between various studies and also those which result from the choice of models. We find that systematic variations exist at the 0.06 dex level both between studies and model atmospheres. In order to control the systematic effects our final gradients depend only on abundances derived herein. A simple linear fit to the Cepheid data from 398 stars yields a gradient d[Fe/H]/dR(G) = -0.062 +/- 0.002 dex kpc(-1) which is in good agreement with previously determined values. We have also re-examined the region of the >metallicity island> of Luck et al. With the doubling of the sample in that region and our internally consistent abundances, we find that there is scant evidence for a distinct island. We also find in our sample the first reported Cepheid (V1033 Cyg) with a pronounced Li feature. The Li abundance is consistent with the star being on its redward pass toward the first giant branch.Robert A. Welch Foundation of Houston, Texas F-634McDonald Observator
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