Now showing items 9172-9191 of 14780

    • Nativistic religious movements among Indians of the United States

      Daugherty, Mary Ann Parke, 1940- (The University of Arizona., 1964)
    • Natural airflow through the Apache Leap tuff near Superior, Arizona

      Smith, Stewart James,1956-; Evans, Daniel D. (The University of Arizona., 1989)
      Significant natural airflow occurs in two boreholes tapping unsaturated, fractured tuff at the Apache Leap Tuff Site near Superior, Arizona. Flow rate and direction through the more productive hole and atmospheric pressure and temperature were monitored during periods from December 1987 through June 1988. A strong correlation between flow velocity and atmospheric pressure exists at time scales of minutes to months, while the effect of temperature on flow is manifested by a seasonal reversal in net flow direction. Net outward flow occurs in winter, reversing to net inward flow by late spring. The observed flow pattern is consistent with that observed at Yucca Mountain, Nevada, which is similar both lithologically and topographically to the Apache Leap Site. The effect of natural airflow on moisture distribution and gaseous radionuclide transport within the tuff should be considered in assessing the suitability of similar sites for high-level waste disposal.
    • Natural frequencies of non-uniform beams

      Ballen, Thomas Joseph, 1939- (The University of Arizona., 1964)
    • The natural frequencies of vibration of slender uniform beams on elastic supports

      Kaser, Raymond Victor, 1938- (The University of Arizona., 1961)
    • Natural Heart: Yangchun Lake Suburban Center Master Plan

      Wang, Yuxin (The University of Arizona., 2013)
      Urbanization in China is rapidly improving with the economic growth. But the development that ignores environment has caused lots of environmental problems in Chinese cities, especially the large ones. As the capital of Hubei Province, Wuhan is the fifth among China cities for its size and its economic production. Because of extreme urbanization and high dense population in Wuhan city, some significant issues have been constantly emerged: lack of adequate wastewater management and water resources protection, urgent need for efficient solution to sludge treatment and disposal, serious urban flooding because of the natural flow or urban lakes and streams restriction, degradation of water quality, and so on. These issues have been seriously impacted the quality life in the city. Along with the urbanization, the conflicts between urban development and ecosystem are inescapable. How can urban development balance environmental sensitivity to support ecological health in the vulnerable urban ecosystem and mitigate the problems in the city? This project tries to redesign a master plan for Yangchun Lake sub-urban center in Wuhan city and find suitable ways to mitigate these problems with attention to the environmental, functional, economic, social and aesthetics aspects of the proposed solutions. The design will balance the urban development and environmental protection, support and enhance the development of a new ecological urban center.
    • Natural history of Cnemidophorus costatus barrancorum in southeastern Sonora, Mexico

      Lowe, Charles H.; Salmon, Julia Valerie, 1963- (The University of Arizona., 1989)
      Cnemidophorus costatus barrancorum was studied in the short-tree forest of southeastern Sonora, Mexico from November 1985 to December 1988. Adult females varied in snout-vent length from 71 to 101 mm, while males reached a maximum of 121mm. Ontogenetic change in color-pattern was pronounced, however sexual dimorphism in color-pattern was slight. The mean number of dorsal scales around mid-body was 99.4. Mating occurred in late July. Females laid two clutches of eggs per season, with clutch size varying from 2-8 (X = 4.2). The maximum shelled egg dimensions were 10.5mm x 15.6mm. Hatchlings appeared in early fall, and were surface-active throughout November. Yearlings emerged from hibernation in February-March. Adults were active from mid-spring into September. C. c. barrancorum had a unimodal daily activity pattern, with activity beginning when air temperature exceeded 30°C. The mean body temperature of surface-active animals was 40.0°C.
    • A natural history study of the funnel-eared bat, Natalus stramineus

      Mitchell, George Clay, 1936- (The University of Arizona., 1965)
    • Natural iodine-129 as a ground-water tracer

      Fabryka-Martin, June Taylor.; Davis, Stanley N.; Long, Austin; Simpson, Eugene S. (The University of Arizona., 1984)
      Iodine-129 (t ½, 16 My) is a naturally-occurring tracer which can be used to study hydrologic and geologic processes on time scales up to 100 My. Global modelling suggests that the pre-bomb atmospheric ratio ¹²⁹I/I should have been constant in time and space. This ratio is the starting value in ground-water recharge, and subsequent ratio changes are determined by isotope contributions from three sources: recharge water, iodine leached from the formation, and in situ uranium fission. This expected behavior is compared to field study results. Ground-water samples from the Great Artesian Basin, Australia, provide an estimate of the atmospheric equilibrium ratio, 6 x 10⁻¹³. Down-gradient changes in water up to 1 My old suggest that subsurface production can be significant. The usefulness of ¹²⁹I as an indicator of brine source and age is verified in brines collected in and around Louisiana salt domes. The method leads to ages of 7 and 9 My for two brine pockets trapped within Jurassic salt, and 32 to > 40 My for oil-field brines in Miocene sands adjacent to the domes.
    • Natural radiation detection using gamma ray spectrometry

      Nahas, Nicholas Michael, 1942- (The University of Arizona., 1972)
    • Natural Regeneration of Oak Woodlands in Southeastern Arizona

      Borelli, Simone,1963-; Ffolliot, P. F.; Guertin, D. P.; Gottfriend, G. J. (The University of Arizona., 1990)
      The lack of information on the reproductive dynamics of Western Live Oak formations has created a need for the collection of baseline data. Therefore, a survey of the state of oak regeneration was conducted at several sites in southeastern Arizona. Presence, type, and amount of regeneration were recorded on 108 temporarily-established transects, on seven sites. Parameters examined for their influence on regeneration were aspect, soil, slope, and density. Frequency distributions and chi-square tests were used to analyze the data. Analysis showed that, when the data are pooled, all the parameters have an influence on the presence and distribution of regeneration. On individual study areas, parameters have limited influence or none at all. Further information will have to be gathered before conclusive statements on the dynamics of oak regeneration can be made.

      Law, Charles Stuart. (The University of Arizona., 1982)

      Orland, Brian Antony. (The University of Arizona., 1982)
    • Natural sealing potential of raw sewage stabilization lagoons

      Deming, Stephen Arthur, 1906- (The University of Arizona., 1963)
    • Natural Tracer Study to Constrain Transit Times and Flowpaths of Groundwater from Davidson Canyon to Lower Cienega Creek

      McIntosh, Jennifer C.; Vicenti, Nicole Christine; Dettman, David; Betterton, Eric (The University of Arizona., 2018)
      Multiple reaches of Cienega Creek and Davidson Canyon Wash, located in the Cienega Creek Watershed, Arizona, have been designated as “Outstanding Arizona Waters.” These surface waters, riparian areas, and underlying groundwater in alluvial basins are under pressure from threats of increasing groundwater pumping, land use, climate change, and potential mining. Yet, little information is known about the regional hydrogeology, which is important for accessing and protecting the sustainability of natural resources in the area. This study investigates the hydrologic connection between the Santa Rita Mountains and lower Cienega Creek, along the Davidson Canyon sub-watershed. Davidson Canyon is an intermittent stream with seasonally sustained baseflows and is a large tributary to Lower Cienega Creek. This research aims to: (1) identify areas of recent recharge; (2) determine the relative age and transit time of groundwater; (3) determine the seasonality of recharge; and (4) use hydrochemistry and isotopes to evaluate flowpaths and mixing of groundwater and interaction with surface water. To address these aims, groundwater and surface water samples were collected seasonally in 2017-2018 and analyzed for major ion chemistry, stable isotopes (δ18O, δD, δ13C, δ34S) and radioactive isotopes (3H and 14C). Results indicate groundwater located in bedrock aquifers in the Davidson Canyon sub-watershed contains a mixture of young (<70 years old), and older (up to 23,000 years old) waters, and is recharged by both winter and summer precipitation. The groundwater in the Empire and Santa Rita Mountains appears to have obtained sulfate from precipitation and pyrite oxidation. Downgradient these waters have dissolved gypsum in the basin-fill aquifer closer to the Davidson Canyon Stream outlet. Groundwater located in the basin-fill aquifers in Lower Cienega Creek is a mixture of young (<70 years old), and older (up to 2,040 years old) waters, and is primarily recharged by winter precipitation. These waters have sulfur isotope signatures indicative of gypsum dissolution and are more chemically evolved downgradient in the basin-fill aquifer. Davidson Canyon flows are predominantly sustained by groundwater discharged from the shallow alluvial aquifer (<10 years old groundwater), recharged by summer and winter precipitation. Lower Cienega Creek surface waters are a mixture of modern (<50 years old) and older waters and are primarily recharged by summer precipitation. Lower Cienega Creek is sustained by local groundwater from the basin-fill aquifers, recent recharge to the shallow alluvial aquifer, and contributions from Davidson Canyon. The source of water in Lower Cienega Creek and Davidson Canyon changes throughout the summer monsoons and winter rainy seasons. Following the first summer or winter precipitation events, there is an initial pulse of older, more chemically evolved groundwater into the stream, followed by inputs of shorter residence time, more dilute waters.
    • Naturalism in prose fiction of the American west; its origin and significance

      Gray, Richard Paul Hopkins, 1937- (The University of Arizona., 1962)
    • Naturalism in the works of Federico Gamboa

      Theobald, John Orr, 1907- (The University of Arizona., 1933)
    • The nature and content of certain trace elements in selected galenas

      Staples, Bruce Allen, 1939- (The University of Arizona., 1964)