Now showing items 11618-11637 of 14576

    • S(N) calculated neutron energy spectra from fusing dt microspheres

      Cauble, Robert C. (The University of Arizona., 1976)
      The mean energy per neutron for neutrons leaving a dense, laser compressed plasma was calculated. A discrete ordinates multigroup neutron transport code (ANISN) was used to calculate the energies and fluxes of the neutrons from the D(T, ⁴He)n reaction. A variety of constand density, core-burning compressed plasmas were considered. The mean neutron engergy was found to be a function of the product pR and a function of r/R, where R is the compressed plasma radius. A detailed thermonuckear burn in a microsphere was calculated at various time intervals by ANISN. The pR product for the sphere was 4.4 g /cm². The neutron density weighted mean energy per neutron was found to be 9.8 MeV.

      CAMACHO-SERNA, MIGUEL (The University of Arizona., 2002)
    • Sacred Sites and the Perpetuation of Religious Beliefs: Indigenous Understandings and Western Perspectives within Legal Frameworks

      Avila, Rosemary Michelle (The University of Arizona., 2011)
      The way in which land is understood and perceived among American Indians and non-Indians is the cause for vast cultural misunderstandings and divisions between the two groups. For American Indian communities, attachments to place are at the core of religious practices, therefore intrinsically linking the importance of one to the other. This thesis attempts to better understand the way in which American Indians maintain connections to sacred sites, the challenges of access to those sites, and how their conceptualizations differ from Western models of value. This thesis examines the ability of federal policies, cases, legislative processes, and legal frameworks to protect American Indian sacred sites when the cultural context in which this protection is afforded has undeniable discrepancies to American Indian beliefs.

      Winters, Elizabeth Hamlink, 1952- (The University of Arizona., 1986)
    • The Safety and Efficacy of Pleurotus ostreatus (Oyster Mushroom) Cultivation on Prosopis spp. Products

      Jackson, Lauren Wayne III (The University of Arizona., 2015)
      Improving food safety and food security is imperative to adequately feed a growing population that is expected to exceed 9 billion people by 2050. Mushroom cultivation provides unique opportunities to take advantage of underutilized resources and produce high-quality food from otherwise inedible or unsafe food sources. Pleurotus ostreatus is a ligninolytic and biotechnologically relevant fungus that can be cultivated on a diverse array of lignocellulosic byproducts. Prosopis spp. are abundant in the Sonoran Desert and broadly distributed in semi-arid to arid regions around the globe. Prosopis spp. legumes (pods), and approximately 25% of all commonly cultivated crops, are susceptible to aflatoxin contamination, a highly carcinogenic and potentially lethal mycotoxin. This work aimed to (1) identify novel lignocellulosic byproducts from the Sonoran Desert for use as substrate materials in Pleurotus ostreatus (oyster mushroom) cultivation; (2) evaluate the safety of mushrooms cultivated on plant products that are contaminated with aflatoxin; and (3) measure the amount of aflatoxin that is degraded by P. ostreatus after the contaminated products have been colonized by the fungus. Prosopis spp. pods were identified as suitable substrate component for P. ostreatus production by conducting yield evaluations and finding that the biological efficiency increased with increasing percentages of pods. No detectable quantity of aflatoxin could be measured in mushrooms that were cultivated on maize that was naturally contaminated with aflatoxin B1 at concentrations up to 2500 ng g⁻¹. P. ostreatus degraded AFB₁ by >85% in maize with initial concentrations of 2500 ng g⁻¹ AFB₁ in repeated experiments. Thus, the cultivation of P. ostreatus on aflatoxin-contaminated products may be a viable method to produce a safe and high quality food from an otherwise unsafe food source, and may double as a means to reduce the aflatoxin concentration in contaminated plant products to levels that are acceptable for use as livestock feed.
    • Safety concerns of southwestern elderly and awareness of police: An exploratory study

      Browning, Bobby Andre, 1961- (The University of Arizona., 1993)
      The purpose of this study was to investigate perceptions of the elderly in the southwest with regard to police, crime and safety. A questionnaire was mailed to 2500 elderly adults residing in the southwestern states of California, Nevada, Arizona, Colorado, and New Mexico. Five constructs were developed to measure these perceptions: (1) attitudes toward police, (2) attitudes toward safety, (3) awareness of police, (4) awareness of community policing, and (5) awareness of crime and safety. A t-test and Oneway analysis of variance were conducted to test each of the hypotheses. Results indicated that independent variables of gender, ethnic background, state and area of residence have little effect on the variables of attitudes toward police and attitudes toward safety. However, there was a higher level of significance found for the independent variables toward the awareness of police and awareness of crime and safety variables.
    • SAGA Youth and Family: Programs for Support and Advocacy

      Sampson, Adelene Wendy (The University of Arizona., 2008)
      As my thesis project, I developed and implemented the SAGA Youth and Family Program through the Wingspan LGBT Community Center and the Southern Arizona Gender Alliance. The first chapter analyzes the use of rights discourse by advocates of transgender youth as a means to gain needed protection and concessions. The second chapter introduces the SAGA Youth and Family Program created to build supportive communities for gender-variant and transgender youth and their families and to end unnecessary isolation, discrimination and harassment affecting transgender and gender-variant youth, their families, and their communities. The SAGA Youth and Family website comprises the final chapter and is one of the three components of the SAGA Youth and Family Program.
    • The saguaro tree-hole microenvironment in southern Arizona, I. Winter

      Krizman, Richard Donald, 1931- (The University of Arizona., 1964)
    • The saguaro tree-hole microenvironment in southern Arizona; II, Summer

      Soule, Oscar Hommel, 1940- (The University of Arizona., 1964)
    • The sailor aboard ship; a study of role behavior in a total institution

      Zurcher, Louis A. (The University of Arizona., 1963)
    • Sainte-Beuve and Arnold; a critical comparison

      Ashley, Gardner Pierce, 1919- (The University of Arizona., 1949)
    • Saints and angels in the Spanish ballads

      Reynolds, Frances Gene, 1923- (The University of Arizona., 1948)
    • The sales tax in Arizona

      Adams, Samuel Thompson, 1912- (The University of Arizona., 1937)
    • Salinity Tolerance of Lettuce Cultivars in Controlled Environment

      Schrader, Stephanie EllaJean (The University of Arizona., 2017)
      The specific objectives of this study were to determine the effects of increasing salinity on growth, crop quality, and physiological parameters of different lettuce (Lactuca sativa L.) cultivars grown either in a hydroponic system or in soil and subjected to irrigation water of varying salinity levels. Two trials were conducted in winter 2016 and summer 2016 in a greenhouse using a hydroponic system for the cultivation of three lettuce cultivars. 'Romaine del Sol', Leaf Lettuce 'Bergams Green' and 'Green Leaf Lettuce' were exposed to irrigation water with increasing salinity (2.1, 3.6, 5.1, and 6.6 dS/m) by supplementing the nutrient solution (2.1 dS/m) with a combination of 2:1 NaCl and CaCl2. Lettuce head height, diameter, leaf number, shoot and root dry weight were not impacted by increasing salinity. Similarly, osmotic potential, transpiration and leaf temperature were not affected. However, head fresh weight and water content were reduced at the higher salinity levels compared to the control in the second trial. A third greenhouse trial was conducted in winter 2017 with 'Romaine del Sol' and 'Green Leaf Lettuce' cultivars grown in a hydroponics system or in containers with soil to determine tolerance to increasing salinity in different substrates. Head height, diameter, and shoot dry mass decreased at the two highest salinity levels at the final harvest. When plants were smaller, salinity had no effect on these variables. Fresh weight, water content, and leaf number decreased with increasing salinity at final harvest for both cultivars however, osmotic potential of both cultivars was not affected by salinity or substrate throughout the study. An informal taste test found that the leaves from the two highest levels of salinity from both cultivars were inedible because of a salty and bitter taste. Mineral concentration of sodium and chloride in ‘Romaine’ and 'Green Leaf Lettuce' increased as salinity levels increased, and plants of both cultivars grown in soil had greater concentrations of both elements when compared to hydroponics. 'Romaine' and 'Green Leaf Lettuce' are more tolerant to salinity than previously reported in other lettuce cultivars, and the physiological variables measured showed little changes in response to increasing salinity. Although lettuce grown at 5.1 dS/m and 6.6 dS/m was marginally acceptable by size standards, the lack of head formation in ‘Romaine del Sol’, and the unfavorable taste of both cultivars would render them unmarketable.
    • Salivary gland chromosome analyses of Drosophila pachea and related species

      Ward, Bernard Lloyd, 1942- (The University of Arizona., 1969)
    • Sample size for inverse binomial sampling

      Keeton, James Donald, 1942- (The University of Arizona., 1969)
    • Sampled-data approximation to a continuous time delay

      Huntzinger, Robert Ward, 1929- (The University of Arizona., 1961)
    • Sampling efficiency evaluation in Emory oak woodlands of southeastern Arizona

      Zanga, Ambroise, 1956- (The University of Arizona., 1989)
      A forest inventory was made by a two-man team in the Emory oak (Quercus emoryi) woodlands, near the Huachuca Mountains, in southeastern Arizona. Two plot sizes, 1/10th, and 1/25th hectare, and three basal area factors, 2, 4 and 6 (square meters per hectare) were used. Tree tally time was recorded, but the travelling time between plots was not recorded. Total number of trees, total basal area, and total volume of trees per hectare were measured, summarized, and analyzed. Significant differences were noted between plot sampling and point sampling. Results suggested that with plot sampling, 1/25th hectare plot was more efficient than 1/10th hectare plot for all measures of forest densities. With point sampling, basal area factor 6 had the highest relative sampling efficiency in terms of trees per hectare. Basal area factor 2 had the highest relative sampling efficiency in terms of basal area and volume per hectare. From this information, more efficient forest inventories of the Emory oak woodlands can be designed.
    • Sampling for estimating characteristics of mackerel in northeast Brazil

      Albuquerque, José Jackson Lima de, 1937- (The University of Arizona., 1969)
    • Sampling Frequency for Semi-Arid Streams and Rivers: Implications for National Parks in the Sonoran Desert Network

      Lindsey, Melanie (The University of Arizona., 2010)
      In developing a water quality monitoring program, the sampling frequency chosen should be able to reliably detect changes in water quality trends. Three datasets are evaluated for Minimal Detectable Change in surface water quality to examine the loss of trend detectability as sampling frequency decreases for sites within the National Park Service's Sonoran Desert Network by re-sampling the records as quarterly and annual datasets and by superimposing step and linear trends over the natural data to estimate the time it takes the Seasonal Kendall Test to detect trends of a specific threshold. Wilcoxon Rank Sum analyses found that monthly and quarterly sampling consistently draw from the same distribution of trend detection times; however, annual sampling can take significantly longer. Therefore, even with a loss in power from reduced sampling, quarterly sampling of Park waters adequately detects trends (70%) compared to monthly whereas annual sampling is insufficient in trend detection (30%).