Now showing items 3773-3792 of 14895

    • Dynamic interactive modelling in elasticity problems

      Tantraphol, Boonrut, 1945- (The University of Arizona., 1972)
    • Dynamic load factors with damping

      Toriello, Michael Raymond, 1947- (The University of Arizona., 1976)
    • Dynamic point relocation: An enhancement for traveling salesman problem initial tour construction procedures

      Rozenblit, Jerzy W.; Gale, Andrew Dent, 1955- (The University of Arizona., 1993)
      Traditional solving techniques for the traveling salesman problem are carried out in two phases. First an initial tour is constructed, then this tour is improved using some form of optimization. The procedure introduced in this research applies a simple optimization technique which minimally increases the runtime of the initial tour construction procedure. At the same time it greatly improves the quality of the tour which is constructed. It does this by globally searching the tour after each insertion for points which require repositioning and performing point relocations where necessary.
    • Dynamic response of structures with geometrically softening components including foundation interaction

      Kiousis, Panos; Stapleton-Hart, Nicole Colette, 1965- (The University of Arizona., 1990)
      The effects of material nonlinearity and geometric instabilities of a bracing system of a dynamically loaded steel frame, as well as nonlinear soil-structure interaction are studied in this thesis. To investigate the response of a frame subjected to severe dynamic loads, a model of the force-displacement relationship of the bracing system is developed to account for the inelastic, post-buckling behavior of a brace subjected to strong compressive loads. This thesis also develops a model of the force-deformation relationship of the foundation-soil interface, confining the study only to the slide mode of failure. From these models, a softening behavior for the bracing system and a hyperbolic load-deformation behavior of the interface are proposed. It is shown that the structural response of a frame is significantly affected when the analysis includes both the effects of softening of the bracing system and soil-structure interaction.

      Khamis, Ibrahim Ahmad, 1956- (The University of Arizona., 1986)
    • Dynamic simulation of the Fast Flux Test Facility primary system

      Sands, Mark Richard (The University of Arizona., 1981)

      KUNDU, T.; Romanel, Celso, 1952- (The University of Arizona., 1987)
      The most popular method in dynamic soil-structure interaction analysis is the finite element method. The versatility in problems involving different materials and complex geometries is its main advantage, yet FEM can not simulate unbounded domains completely. A hybrid method is proposed in this research, which models the near field (structure and surrounding soil) by finite elements and the far field by a continuum approach. The system is excited by monochromatic body waves (P and SV) propagating with oblique incidence and harmonic time dependence. The far field problem is solved using Thomson-Haskell formulation associated with the delta matrix technique. The soil profile does not contain any soft layer and the layers are assumed to be linearly elastic, isotropic, homogeneous and perfectly bonded at the interfaces. Two-dimensional (in-plane) formulation is considered and the analysis is performed on both k- and o-planes through time and spatial Fourier transforms of the field equations and boundary conditions. (Abstract shortened with permission of author.)
    • A dynamic solution to the time constrained transportation scheduling problem

      Xenos, Michael John, 1936- (The University of Arizona., 1968)
    • Dynamic testing of desert soils

      Abu-Obeid, Hamid A., 1940- (The University of Arizona., 1970)

      Woodworth, Ronald Keith. (The University of Arizona., 1985)

      Barua, Susmita, 1961- (The University of Arizona., 1987)
      The dynamics and changes in the pattern of the interstate migration system in India during the post-Independence period are explored. Three major perspectives, namely (i) the demographic effectiveness of net migration in changing the regional and ethnic balance of population distribution, (ii) the principal components or regional subsystems of in- and out-migration based on similarities in the origin and destination areas of migrants, and (iii) the shift-share components of the change in net migration are adopted to provide insight into the changing structure of interstate population movements in India. The major findings are compared with those of other similar studies done in the context of developed countries. The post-Independence development policies have had a significant impact in diffusing the highly polarized pre-Independence pattern of interstate migration in India.
    • Dynamics of a desert grassland range in relation to drought, fire and grazing

      Sourabie, Kouana Martin (The University of Arizona., 1982)

      Fox, Fred Andrew (The University of Arizona., 1985)
    • Dynamics of a plasticating extruder

      Smith, Richard Alan, 1943- (The University of Arizona., 1969)
    • The dynamics of an earth-scanning satellite stabilized by gravity-gradient and inertia wheels

      Rumsey, Frank Alexander, 1930- (The University of Arizona., 1962)
    • Dynamics of canopy structure and soil surface cover in a semiarid grassland

      Goff, Bruce Franklin.; Thames, John L.; Renard, Kenneth G.; Gay, Lloyd W. (The University of Arizona., 1985)
      Characteristics of canopy structure and soil surface cover are necessary parameters in hydrologic models of arid and semiarid watersheds. In order to quantify these characteristics, two study sites were established on an experimental watershed in southeastern Arizona, and periodic measurements were made during the 1983 summer/fall growing season. During this period, maximum mean foliage height ranged 10-12 cm on the two study sites, while maximum mean foliage mass and foliage cover ranged 67-105 g/m2 and 30-51%, respectively. Mean live leaf area index (LAI), calculated from foliage mass data, peaked at 0.6-0.7. Mean soil surface cover averaged 34-57%. In general, little change was observed in the measured characteristics on either site during the season. Although the two sites differed considerably in foliage and surface covers, they were similar in foliage mass and LAI.
    • Dynamics of Chytrid Fungus (Batrachochytrium Dendrobatidis) Infection in Amphibians in the Rincon Mountains and Tucson, Arizona

      Schwalbe, Cecil R.; Ratzlaff, Kristina M.; Rosen, Philip C.; Swann, Don E.; Matter, William J.; Schwalbe, Cecil R. (The University of Arizona., 2012)
      The chytrid fungus Batrachochytrium dendrobatidis (Bd) has been implicated in amphibian declines around the world, including the southwestern United States. I studied patterns of Bd infection in Hyla arenicolor, Rana catesbeiana, and R. yavapaiensis in the Rincon Mountains and Tucson Basin in Arizona. Bd prevalence and infection intensity were location dependent in all species and R. yavapaiensis may be a reservoir of Bd for H. arenicolor, where they co-occurred. Treatment of a backyard population of R. yavapaiensis with itraconazole did not reduce winter frog mortality due to Bd. The lethal Bd infection threshold of this population was between 59,847 and 4,237,330 zoospores. Zoospore loads from swabs of freshly dead frogs did not differ significantly from those taken from those same frogs following freezing and thawing. Thus, important information regarding infection intensity and probable cause of death can be gathered from frogs collected by others and frozen until convenient to process.
    • The dynamics of collared peccary dispersion into available range

      Supplee, Vashti Crowninshield (The University of Arizona., 1981)
    • Dynamics of selected aspects of United States relations with Spain, 1945-53

      Duman, Robert John, 1933- (The University of Arizona., 1965)