Article
Sedimentation rates in Lake Chapala (Western Mexico): Possible active tectonic control
Fecha
2005Autor
Podzharov, E.I.
Institución
Resumen
An analysis of possibilities for the selection of gear and tool geometry parameters is presented to reduce tooth profile errors during the grinding of gears by double tapered wheel (Hofler or Niles method), double wheel generating (Maag method) and by worm wheel techniques (Reishauer method). The selection of gear and tool geometry parameters is based on the analysis of the grid diagram of a gear and a rack. Formulas and graphs are presented for the selection of the pressure angle, module, and addendum of the rack-tool. The experimental results of the grinding of gears confirm the theoretical analysis. Copyright " 2005 Taylor & Francis Inc.",,,,,,"10.1080/10910340500226749",,,"http://hdl.handle.net/20.500.12104/44433","http://www.scopus.com/inward/record.url?eid=2-s2.0-27544495136&partnerID=40&md5=4f82535d2692e85a9690487a40be3948",,,,,,"3",,"Machining Science and Technology",,"369 381",,"9",,"Scopus WOS",,,,,,"Gear Geometry Parameters; Gear Grinding; Precision of Gear Grinding; Tool Selection",,,,,,"Selection of geometric parameters of gear and grinding wheel to ensure maximum gear tooth profile accuracy",,"Article"
"46197","123456789/35008",,"Fernex, F., UMR-CNRS Géosciences De l'Environnement, Geochimie Isotopique, Valrose, F-06108 Cedex 2, France; Zárate-Del Valle, P., Universidad De Guadalajara-CUCEI, Dep. De Quimica, Ap. Postal 4-021, Guadalajara, Jal., cp 44410, Mexico; Ramírez-Sánchez, H., Universidad De Guadalajara-CUCEI, Dep. De Quimica, Ap. Postal 4-021, Guadalajara, Jal., cp 44410, Mexico; Michaud, F., UMR GeoSciences Azur, Lab. De Geodynamique Sous Marine, Universite Pierre Et Marie Curie, La Darse BP 48, 05235 Villefranche-sur-Mer Cedex, France; Parron, C., Géosciences De l'Environnement, CEREGE, University d'Aix-Marseille, Le Petit Arbois, BP 80, F-13545 Aix-en-Provence Cedex 4, France; Dalmasso, J., Lab. De Radioecologie Et Radiochimie, Facultd Des Sciences, Valrose, 06108 Cedex 2, France; Barci-Funel, G., Lab. De Radioecologie Et Radiochimie, Facultd Des Sciences, Valrose, 06108 Cedex 2, France; Guzman-Arroyo, M., Institute De Limnologia, Universidad De Guadalajara, Chapala, Mexico",,"Fernex, F. Zarate-Del Valle, P. Ramirez-Sanchez, H. Michaud, F. Parron, C. Dalmasso, J. Barci-Funel, G. Guzman-Arroyo, M.",,"2001",,"Lake Chapala, a major natural freshwater reservoir, belongs to the watershed of the Rio Lerma, which originates from the Mexico City area, 450 km eastwards. The east-west-trending Lake Chapala basin is located on the active tectonic feature Citala rift. Sediments of cores collected in the lake were studied for their 210Pb, 226Ra, 137Cs and 239-240Pu activities in order to evaluate sedimentation rates. Profiles of magnetic susceptibility allowed stratigraphic correlations to be made since some fine levels display more or less high susceptibility values. This allows an average sediment accumulation rate to be calculated. The sediment accumulation rate was calculated assuming that, the activity at the interface of a defined site is constant in the course of time, since any global decrease or increase in the rates could not be observed. The direct flux of atmospheric 210Pb was evaluated from the inventory in a horizontal soil: 0.25-0.3 dpm g-1. Except from two cores at the west, the fluxes to sediment were higher than the direct atmospheric flux. The sedimentation rate's temporal variations along the cores seem to be mainly related to annual precipitation changes, with rates lower during the dryness epochs (1945-1957 and 1979-1991). The rates measured in the western part of the lake range approximately from 1 to 2 mm year-1. The lowest rates in the central and eastern areas are higher than 2.4-2.5 mm year-1 and exceed 3.5 mm year-1 (0.066 g cm-2 year-1) near the Rio Lerma prodelta. As the lake is not deeper eastward than westward, it can be suggested that relative subsidence, related to the active tectonic framework, compensates the higher sedimentation rate. " 2001 Elsevier Science B.V. All rights reserved.