Now showing items 20045-20064 of 20709

    • W. F. Libby and the Archaeologists, 1946-1948

      Marlowe, Greg (American Journal of Science, 1980-01-01)
      Archaeologists began to participate in cross-disciplinary endeavors in the 1930's, albeit on a very limited basis. The passage of time found members of that discipline unprepared for collaboration with physical scientists when W F Libby announced the development of the radiocarbon dating method. Libby proposed to apply to archeologic and geologic samples techniques based on ideas that were completely foreign to archeology.... The initial reactions of archeologists were sometimes amusing but more often significant, for they led to the foundation and emergence of the radiocarbon chronology that has so profoundly affected our understanding of prehistory (Johnson, 1967, p 165). To date, our historical knowledge about the nature, function, and impact of the early (1946-1948) relations between Libby and American archaeologists has come to us in the form of published anecdotes, many of which contain inaccurate information. The author's access to W F Libby's private 14C correspondence, combined with data obtained from interviews with some of the principal participants throughout this period, offers many new or different insights into the nascent years of radiocarbon dating. When, and under what unexpected cricumstances, did Libby first encounter representatives of the achaeologic community? What strategies were employed to facilitate diffusion of knowledge about 14C dating across disciplinary boundaries? How did archaeologists respond to the introduction or "intrusion" into their field of Libby's radioactive age-measurement tool?
    • Wadi Shaw 82/52: 14C Dates from a Peridynastic Site in Northwest Sudan, Supporting the Egyptian Historical Chronology

      Lange, Mathias (Department of Geosciences, The University of Arizona, 1998-01-01)
      In the framework of the interdisciplinary project "Settlement History of the Eastern Sahara" at the Universitat zu Koln, a large number of sites were excavated during the 1980s in northern Sudan, where the Laqiya-region with the Wadi Shaw and Wadi Sahal was one of the main research areas. About 150 sites have been surveyed and partly excavated. One of these sites, Wadi Shaw 82/52, yielded sherds of a Maidum bowl, which is dateable to the Egyptian IVth and Vth Dynasty. This site was dated by four radiocarbon dates. The dates are compared with the historical chronology of Egypt for the IVth and Vth Dynasty, and are shown to be in good agreement.
    • “Wagons Ho!”

      Caring, Jude (Society for Range Management, 2002-08-01)
    • Waking from the Jurisdictional Nightmare of Multinational Default: The European Council Regulation on Insolvency Proceedings [Note]

      Lechner, Roland (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 2002)
    • Walk Across Arizona: Community Fitness Program

      Littlefield, Joanne (College of Agriculture, University of Arizona (Tucson, AZ), 2004)
    • Wall Creek Game Range—A Dissenting View

      Wuerthner, George (Society for Range Management, 1992-02-01)
    • The Walleye as a Wallflower

      Tash, Jerry C.; Holanov, Stephen H.; Cooperative Fishery Unit; Cooperative Fishery Unit (College of Agriculture, University of Arizona (Tucson, AZ), 1976)
    • Wamis: an aid in locating information

      White, Linda M.; Department of Watershed Management (College of Agriculture, University of Arizona (Tucson, AZ), 1974)
    • Want to Be a Soils Man?

      Buehrer, T. F. (College of Agriculture, University of Arizona (Tucson, AZ), 1952)
    • War, Law &(and) Liberal Thought: The Use of Force in the Reagan Years [Article]

      Fidler, David P. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 1994)
    • Warehouse Receipts in United States Law - Summary for the Pacific-Rim [Article]

      Kershen, Drew L. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 2016)
    • Warehouse Receipts: A Roadmap for the Harmonization of Trans-Pacific Law and Practice [Article]

      Zhivkov, Vassil D. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 2016)
    • Warm Springs Wildlife Management Area: A Study in Managing for Multiple Values

      Gallagher, Jerry; Frisina, Michael R. (Society for Range Management, 1995-12-01)
    • Warm Temperate Grasslands

      Brown, David E.; Makings, Elizabeth; Arizona State University (University of Arizona (Tucson, AZ), 2014-01)
    • Warm-season grass establishment as affected by post-planting atrazine application

      Bahler, C. C.; Moser, L. E.; Griffin, T. S.; Vogel, K. P. (Society for Range Management, 1990-09-01)
      Atrazine [6-chloro-N-ethyl-N’-(l-methylethyl)-1,3,4-diamine] provides effective weed control during big bluestem (Andropogon gerardii Vitman) and switchgrass (Panicum virgatum L.) establishment. However, most other desirable warm-season grasses are susceptible to atrazine injury at establishment. The objective of this study was to determine if atrazine application after seeding would affect susceptible warm-season grass establishment. Big bluestem, switchgrass, indiangrass [Sorghastrum nutans (L.) Nash] sideoats grama [Bouteloua curtipendula (Michx.) Torr.], and little bluestem [Schizachyrium scoparium (Michx.) Nash] were seeded into greenhouse flats or field plots and 2.2 kg a.i. atrazine/ha applied at 0 (atrazine control), 7, 14, or 21 days after planting. An untreated control was used also. In greenhouse experiments, Indiangrass and sideoats grama plant survival increased when atrazine applications were delayed. Switchgrass, big blue stem, and little bluestem plant survival was not affected by atrazine application. Field studies were conducted in 1983, 1985, and 1986 using the same soil type, grass species, and application periods as the greenhouse study. Delaying atrazine application 7 or more days after planting generally favored survival of lndlangrass and sideoats grama. Big bluestem, switchgrass, and little bluestem were not affected by atrazine treatment. Delaying the application of atrazine may favor the survival of atrazine sensitive species. However, further research needs to be conducted on various soil types and environmental conditions before this can be a recommended practice.
    • Warm-Season Grasses in the Northern Great Plains

      Tober, Dwight A.; Chamrad, A. Dean (Society for Range Management, 1992-08-01)
    • Warrant-Based Targeting: Prosecution-Oriented Capture and Detention as Legal and Moral Alternatives to Targeted Killing [Article]

      Govern, Kevin H. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 2012)
    • Warranties and Consumer Protection in Swiss Law [Article]

      Stauder, Bernd (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 1987)
    • Was the High Plains a Pine-Spruce Forest?

      Hall, Stephen A. (Society for Range Management, 2000-02-01)
    • Was This A Prize Bitterbrush?

      Nord, E. C. (Society for Range Management, 1962-03-01)