Now showing items 11598-11617 of 14720

    • Robert Stephen Hawker, Vicar of Morwenstow

      Holt, Emily Adams (The University of Arizona., 1930)
    • Rock fracture aperture and gas conductivity measurements in situ

      Trautz, Robert Christian.; Evans, Daniel D. (The University of Arizona., 1984)
      Recent interest in locating a nuclear waste repository in unsaturated fractured rock has lead to rock characterization studies. Essential to a study of this type is the measurement of natural rock fracture apertures and gas conductivities. Six pneumatic connections located in unsaturated crystalline rock were tested using gas flow tests conducted in parallel boreholes. It was believed, but not possible to verify accurately enough given the limited orientation data, that the pneumatic connections represented individual fractures. For the purpose of analysis, it was assumed that the pneumatic connections tested were "equivalent" to isolated individual fractures intersecting both test boreholes. Analytical equations were developed to treat fractures inclined to the borehole axis. These equations were used to calculate equivalent pneumatic apertures and equivalent gas conductivities from the test data. Equivalent pneumatic apertures calculated ranged from 9 to 200 microns and equivalent gas conductivities ranged from 3.78E-3 to 1.92 m/s.

      Kemeny, John; Monte, Jamie Marie (The University of Arizona., 2004)
      The primary focus of this research is to evaluate whether laser scanning and digital imaging can provide a reliable means to collect essential rock mass data. Simulated and field case studies were conducted to determine if fracture orientation data (dip angle and dip direction) can be accurately estimated from a laser generated three - dimensional point cloud. Orientations measured with a Brunton Compass were compared to values derived from point clouds. The difference in dip direction was within three degrees and as high as twelve degrees for the dip angle. When fracture sets were estimated for both field and laser data, good correlation in mean set orientation and set distribution was observed. Some sets recorded during field mapping were absent in stereo plots of laser derived data due to a shadow zone created during scanning. This indicated that scanning from multiple locations is necessary to reduce potentially missed data. This thesis also investigated whether the newly proposed Digital Rock Mass Rating (DRMR) system could classify rock masses similar to established systems such as the Geological Strength Index (GSI). The seven DRMR parameters, fracture spacing, length, large -scale roughness, block volume, rock bridge percent, and rock mass texture were calculated for images of poor to good rock masses. When DRMR values were compared to GSI ratings estimated during field work, good correlation was seen for good quality rock masses (GSI between 40 and 60). The DRMR overestimated ratings for outcrops with GSI values less than 40, indicating that the rating system may not be applicable for poor quality rock masses. Additional case studies are needed to further validate the DRMR classification system.
    • Rodents of the Algodones Dunes, Imperial County, California

      Hill, Shirley Jean, 1941- (The University of Arizona., 1965)
    • The Role and Status of Palestininan Women in the Struggle for National Liberation: Static or Dynamic?

      Nassar, Maha T.; Toenjes, Ashley; Smith, Charles D. Jr.; Hudson, Leila O. (The University of Arizona., 2011)
      This thesis argues that the elite and urban women leaders of the Palestinian women's movement neglected to engage rural women and women living in refugee camps as their equals in a women's movement. Further, despite women's active presence in the public sphere, the sphere remained defined in masculine terms. As a result, Palestinian women, as "guests" in the domain of men, were easily pushed out after they had served their purpose in the nationalist crisis. What is remarkable is that even after Palestinian men reclaimed the public sphere, Palestinian women remained politically active in the private sphere. In order to understand how this was possible, we must look more closely at the terms "public sphere" and "private sphere".
    • The role and usability of climate forecasts for flood control and water supply agencies in Arizona: a case study of the 1997-98 El Nino

      Sorooshian, Soroosh; Pagano, Thomas Christopher; Sorooshian, Soroosh (The University of Arizona., 1999)
      The 1997-98 El Nino provided a unique opportunity for climate information and forecasts to be utilized by water management agencies in the Southwestern U.S. While Arizona has experienced high streamflow associated with previous El Nino events, never before had an event of such magnitude been predicted with advance warning of several months. Likewise, the availability of information, including Internet sources and widespread media coverage, was higher than ever before. Insights about use of this information in operational water management decision processes are developed through a series of semi-structured in-depth interviews with key personnel from a broad array of agencies responsible for emergency management and water supply, with jurisdictions ranging from urban to rural and local to regional. The interviews investigate where information was acquired, how it was interpreted and how it was incorporated into specific decisions and actions. The interviews also investigate agency satisfaction with the products available to them, their operational decisions, and intentions to utilize forecast products in the future. Study fmdings lead to recommendations about how to more effectively provide intended users of forecasts with information required to enact mitigation measures and utilize opportunities that some climatic events present.
    • A role for a clinical pharmacist in the treatment of pediatric emergency care patients

      Rittmeyer, Terry Lee, 1942- (The University of Arizona., 1975)
    • A Role for Partial Awareness in the Modulation of Semantic Priming Effects

      Forster, Kenneth I.; Thomas, Joseph Denard; Forster, Kenneth I. (The University of Arizona., 2008)
      The present study sought to investigate the extent to which masked semantic priming is an automatic process and whether its effects vary depending upon the type of stimuli used. Recent studies have shown that there is a differential priming effect for prime-target pairs with different types of semantic relationships. Here, using a semantic categorization task with masked priming, we compared the effects of synonym, antonym,and associatively related non-exemplar prime-target pairs when presented at different stimulus onset asynchronies (SOAs). Participants took a prime visibility posttest in conjunction with the categorization task which served as a measure of "partial awareness" of the prime. The results here indicate that differences in perceptual awareness may produce differential semantic priming patterns across the semantic relationships and SOAs considered. Potential mechanisms for this divergence are proposed.
    • Role for Selective Sphingosine 1-Phosphate Receptor 1 Modulation During Acute Ischemic Injury in an Experimental Male and Female Mouse Stroke Model

      Gonzales, Rayna J.; Shi, Samuel; Qiang, Liu; Wang, Ting (The University of Arizona., 2018)
      Acute ischemic stroke (AIS) is a neurological disease caused by cessation of blood flow to the brain. Globally, AIS is the second leading cause of death in addition to being the leading cause of long term disability. Effective treatment strategies for ischemic stroke are limited; novel effective therapies are in great demand. Stroke pathophysiology is characterized by an initial ischemic event followed by a deluge of typical secondary responses including inflammation and vascular endothelial dysfunction. Recently the endogenous sphingolipid pathway has emerged as possible therapeutic target for attenuating ischemic brain damage. The sphingosine signaling pathway comprises of sphingosine-1-phosphate as well as its associated receptors that regulate a wide variety of physiological mechanisms, some of which are involved in AIS pathophysiology. In this thesis I will review the sphingosine signaling pathway biology as well as relevant effects on vascular function and inflammation. In addition, I will present and discuss data gathered during my thesis studies investigating sphingosine 1-phosphate receptor modulation in an experimental male and female mouse model of ischemic stroke and reperfusion.

      Kells, Carol Bulzoni, 1944- (The University of Arizona., 1982)
    • The role of a saline water supply and sulfuric acid in increasing irrigated land at Gila Bend, Arizona

      Aljobury, Faiz Abdul-Sattar,1947-; Bohn, Hinrich L. (The University of Arizona., 1978)
      In this study, well and drainage water were mixed at different rates, and treated with varying amounts of H₂SO₄ to determine if drainage water could supplement ground water supplies and if H₂SO₄ would improve the irrigation water quality of the water mixtures. This study showed that adding amounts of H₂SO₄ equivalent to 15 percent of CO₃ + HCO₃ in irrigation water reduced the detrimental effect of salinity on soil properties and plant growth. In such cases H₂SO₄, which is becoming abundant as an industrial by-product, could be an economic aid in reducing adverse effects of excessive levels of exchangeable sodium in irrigated soils.
    • The role of biosorption in the fate of organic halide present in a Kraft mill wastewater

      Cordes, Kathleen Louise,1964-; Amy, Gary L.; Bryant, Curtis Woody (The University of Arizona., 1987)
      This report summarizes and discusses the research and results of the investigation of biosorptive removal of organic halogens from a Kraft mill wastewater. Wastewater from a lagoon treating Kraft mill wastewater was placed in contact with returned activated sludge (RAS) collected from a Tucson wastewater treatment plant. Removal of organic halogens was quantified as the difference in total organic halogen (TOX) level between samples containing wastewater and biomass and samples containing wastewater alone. Two molecular weight distributions were analyzed: total molecular weight and <1000 molecular weight. Total organic carbon (TOC) levels for the total molecular weight fractions were monitored. The effects of pH, temperature, biomass viability and contact time on biosorptive capabilities were examined. Implications concerning lagoon operation are discussed. Improvements for future research in this area are included in this report.