58 research outputs found
Aberrant Radiocarbon Dates on an Inuit Arrowhead
No full textApparently aberrant radiocarbon dates on a Thule culture antler artefact lead to the conclusion that this tool was made of material that was already ancient at the time of manufacture. This finding documents a potential problem in the interpretation of radiocarbon dates on Arctic cultural materials.Des datations au radiocarbone apparemment aberrantes effectuées sur un objet de la culture Thulé fabriqué en bois d\u27animal permettent de conclure que cet outil a été fait d\u27un matériau qui était déjà ancien à l\u27époque de sa fabrication. Ces résultats documentent un problème potentiel dans l\u27interprétation de la datation au radiocarbone sur des matériaux culturels de l\u27Arctique
The Nuclear Structure of ¹⁵¹Sm
No full textAn experimental study of the low-lying levels of the nucleus ¹⁵¹sm has been made using the single particle transfer reactions 1) ¹⁵²Sm (d,t)¹⁵¹Sm , 2)¹⁵¹Sm(³He,α)¹⁵¹Sm, 3) ¹⁵⁰Sm (d,p)¹⁵¹Sm , 4) ¹⁵¹Sm (d,p)¹⁵²Sm, 5) ¹⁵¹Sm(d,t)¹⁵⁰Sm and 6) ¹⁵¹Sm(³He,α) ¹⁵⁰Sm. Also,inelastic scattering and Coulomb excitation experiments were performed on targets of ¹⁵¹Sm. The information obtained from these experiments when combined with the results of previous studies of the decay of ¹⁵¹Pm, has allowed definite spin and parity assignments to be made for about 15 levels in ¹⁵¹Sm, and has put limitations on the possible assignments for several others. The level scheme obtained is compared with the predictions of the Nilsson model, including the effects of Coriolis and ΔN=2 mixing.Doctor of Philosophy (PhD
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Short-term variation during asbestos abatement activities
No full textThe fibrous aerosol monitor (FAM) was designed to count fibrous particulates as accurately as the standard method, P & CAM 239, now NIOSH 7400. The Hi-Vol (HV) method, a modification of the standard method, was developed to collect fibers over a shorter time interval (i.e., 10-minutes) with the same accuracy as the standard method. The current study sought to compare the HV method with the FAM to assess its validity in measuring airborne asbestos levels and to assess the importance of short-term variation in asbestos levels in determining appropriate respiratory protection. Correlation between the FAM and HV showed a poor linear relationship in all comparison studies. However, there was good correlation between the average of short-term HV samples and long-term time-weighted average (TWA) samples at reported low levels of airborne asbestos. All membrane filter techniques showed strong correlation with each other, but were weakly correlated with the FAM. (Abstract shortened with permission of author.
‘End of the Goddamned thing!!’
No full textThe mystery fiction writer Erle Stanley Gardner and his publisher Thayer Hobson of Morrow devised an unusual procedure for connecting the first ten Perry Mason novels with ‘leads’ to provoke the reader’s curiosity, and so promote the sale of the succeeding book. The genesis of these ‘leads’, and the contrasting views of author and publisher on the requirements of endings in mysteries, is documented through their correspondence. The paper examines Erle Stanley Gardner’s resourcefulness in triggering different types of curiosity, and the issues that could arise when publishers substituted or curtailed these ‘leads’ in reprint editions. In translated editions the endings of these books became especially liable to modifications according to the expectations of the target culture. Differing conventions and fashions for the concluding textual threshold are exemplified from the manuscript evidence (including novels written by Erle Stanley Gardner under the pseudonym A.A. Fair) and from the very extensive dissemination of these best-selling works in book form.L’auteur de romans policiers Erle Stanley Gardner et son éditeur chez Morrow, Thayer Hobson, ont imaginé une procédure originale pour éveiller la curiosité du lecteur et promouvoir la vente du prochain épisode de la série Perry Mason, en reliant ses dix premiers romans par un système d’ « indices ». La genèse de ces « indices » et les opinions divergentes de l’auteur et de son éditeur quant aux exigences de la fin dans le roman policier sont mises en relief dans leur correspondance. Cet article étudie les différentes techniques utilisées par Erle Stanley Gardner pour éveiller la curiosité du lecteur, ainsi que les problèmes soulevés par la tendance des éditeurs à substituer ou limiter ces « indices » dans les rééditions successives. C’est dans la traduction des romans cependant que la fin devient particulièrement sujette aux modifications, selon les attentes culturelles du public-cible. Les modes et conventions divergentes mises en jeu dans le choix d’un seuil textuel final s’inscrivent dans les manuscrits (et dans les romans écrits par Erle Stanley Gardner sous le pseudonyme de A.A. Fair) et dans la diffusion internationale de ces best-sellers
Stable carbon and nitrogen isotopic measurements of the wild animals hunted by the Norse and the Neo-Eskimo people of Greenland
No full textIsotopic measurements of the terrestrial and marine wild animal species of greatest importance to Greenlandic Norse and Neo-Eskimo people were obtained to provide a solid basis for undertaking isotopic dietary analyses of these two human groups. The samples studied were animal bones from archaeological excavations of Norse and Neo-Eskimo middens. As expected, the values for the terrestrial and marine species were found to have characteristic isotopic composition, but there is sufficient variation within each group to require detailed consideration in interpreting isotopic information on the humans.</p
Growth of a manganese nodule from Peru Basin: A radiochemical anatomy
No full textAttempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source
U-Th isotopes and Fe-Mn composition of layers from the bottom side of Mn nodule SO11_262DK (262GBHF)
No full textAttempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source
U-Th isotopes and Fe-Mn composition of layers from the top side of Mn nodule SO11_262DK (262GBHF)
No full textAttempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source
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