832 research outputs found

    Nuclear Magnetic Resonance and Hyperfine Structure

    Get PDF
    Contains reports on three research projects

    Nuclear Magnetic Resonance and Hyperfine Structure

    Get PDF
    Contains reports on four research projects

    Vortex Reconnection as the Dissipative Scattering of Dipoles

    Full text link
    We propose a phenomenological model of vortex tube reconnection at high Reynolds numbers. The basic picture is that squeezed vortex lines, formed by stretching in the region of closest approach between filaments, interact like dipoles (monopole-antimonopole pairs) of a confining electrostatic theory. The probability of dipole creation is found from a canonical ensemble spanned by foldings of the vortex tubes, with temperature parameter estimated from the typical energy variation taking place in the reconnection process. Vortex line reshuffling by viscous diffusion is described in terms of directional transitions of the dipoles. The model is used to fit with reasonable accuracy experimental data established long ago on the symmetric collision of vortex rings. We also study along similar lines the asymmetric case, related to the reconnection of non-parallel vortex tubes.Comment: 8 pages, 3 postscript figure

    Cherenkov Light Imaging - Fundamentals and recent Developments

    Full text link
    We review in a historical way the fundamentals of Cherenkov light imaging applied to Ring Imaging Cherenkov Counters. We also point out some of the newer developments in this very active field.Comment: Submitted to special edition of NIMA, Proceedings of RICH201

    Nuclear Magnetic Resonance

    Get PDF
    Contains research objectives and reports on five research projects

    Power and Vulnerability: How We Can Be Influenced

    Get PDF
    I watched the ballet and started thinking of parallels I could connect with historical events. Editor\u27s note: This paper received third prize ($25)

    Nuclear Magnetic Resonance and Hyperfine Structure

    Get PDF
    Contains reports on six research projects

    The French and Indian Wars: New France\u27s Situational Indian Policies During the Fox and Natchez Conflicts, 1701-1732

    Get PDF
    This research examines the often-glorified relationship between New France and the American Indians with which that empire came into contact in North America, focusing primarily on the conflicting policies seen during the Fox Wars and the Natchez Wars. Many recent histories of New France, including Richard White\u27s seminal study The Middle Ground: Indians, Empires and Republics, 1650-1815, focus primarily on the lands surrounding the Great Lakes. These histories champion a French Indian policy that was dominated by the fur trade and illustrated by the outbreak of the Fox Wars in 1712. However, New France\u27s Indian policy was not always dictated by the vast and powerful fur trade. Once the French reached the Gulf of Mexico and began settling in the Deep South, priorities changed, and an often-overlooked chapter of colonial French history began. Much of the primary research on the Natchez Indians was performed by looking exhaustively though the letters, decrees and memoirs written in The Mississippi Provincial Archives: French Dominion Volumes II, III and IV. Antoine-Simon Le Page du Pratz\u27s L\u27Histoire de la Louisiane also proved to be an invaluable primary resource during the process. When dealing with the Upper Country, much of my research focused on the primary source smorgasbord presented online by the Wisconsin Historical Collections and the Michigan Pioneers and Historical Collections

    Nuclear Magnetic Resonance and Hyperfine Structure

    Get PDF
    Contains reports on five research projects
    corecore