Now showing items 7147-7166 of 14835

    • Identification of Groundwater Basin Shape and Boundary Using Hydraulic Tomography

      Yeh, Tian-Chyi Jim; Daranond, Kwankwai; Ferre, Paul A.; Meixner, Thomas (The University of Arizona., 2019)
      Shapes and boundary types of a groundwater basin play important roles in the analysis of groundwater management and contaminant migration. Hydraulic tomography (HT) is a recently developed new approach for high-resolution characterization of aquifers. HT is not only an inverse methodology but also a logic data collection approach for non-redundant hydraulic information to provide high-resolution characterizations of aquifers. In this study, HT was applied to synthetic 2-D aquifers to investigate its feasibility to map the irregular shapes and types of the aquifer boundaries. We first used the forward model of VSAFT2 to simulate hydraulic responses of aquifers due to pumping tests under combinations of irregular geometries and different boundary conditions, e.g., constant head, and no-flow boundaries. Then, we used SimSLE (Simultaneous Successive Linear Estimator) inverse model in VSAFT2 to estimate the spatial distribution of hydraulic properties within rectangular-shaped domains with constant head boundaries. The simulations were conducted in both steady and transient states using a similar monitoring network to assess the ability of HT for detecting types and shapes of the boundary. Furthermore, the improvement of the estimation with prior information of transmissivity and storage coefficient was investigated. These cases were conducted using Monte Carlo simulations to ensure statistical meaningful conclusions.
    • Identification of parameters describing a conductor-backed dielectric slab

      Dudley, Donald G.; Tran, Huong Ngoc, 1966- (The University of Arizona., 1989)
      In this parametric inverse problem, we consider a lossless dielectric slab excited by a transient plane wave. The scattered electric field from the slab is presented in the ray-optic and the complex-resonance forms. Our interest is to extract the complex-resonances of the system in order to identify the parameters that describe the scatterer. We review the signal processing procedure and the identification procedure employed to identity the poles of the system. We investigate the effect of noise on identification and determine the maximum amount of noise one can impose on the system. In addition, we study the effect of data truncation on our identification procedure. We also discuss the parameters that dictate the minimum record required for successful identification. Finally, we demonstrate some similarities in effect of noise and truncation on our identification process.
    • An identification of psychological openness in first grade children

      Qashu, Marian Faye, 1936- (The University of Arizona., 1965)
    • Identification of some opaque minerals by direct measurement of polarizing angles

      Gisler, Patrick Michael, 1946- (The University of Arizona., 1971)
    • Identification of stress indicators of mothers who come to a well baby clinic

      Aviles Castro, Maria Estela (The University of Arizona., 1978)
    • Identification of Suppressors of a Cold-Sensitive Receptor-Like Kinase Mutant in Arabidopsis thaliana

      Tax, Frans; Wellington, Rachel Courtney; Laney, Jeffrey; Elfring, Lisa (The University of Arizona., 2016)
      Long-distance signaling is an important process in the development of Arabidopsis thaliana. A leucine-rich repeat receptor-like kinase (LRR-RLK), XYLEM INTERMIXED WITH PHLOEM1 a.k.a. C-TERMINALLY ENCODED PEPTIDE RECEPTOR 1 (XIP1/CEPR1), functions in vascular development and has recently been implicated in nitrogen sensing and response. Previous results indicate that XIP1/CEPR1 also interacts with multiple proteins involved in sugar metabolism and transport as well as other metabolic proteins, which indicates a possible role for XIP1/CEPR1 in mediating sugar transport. xip1-1 seeds, which grow slowly in the cold in comparison to Columbia wild-type plants, were previously EMS mutagenized and screened for suppressors of the cold-sensitive phenotype. One of these suppressors, 9-12, maps to the lower region of chromosome V and several possible causative EMS-like mutations have been identified that may link XIP1/CEPR1 to a more general vascular transport role.
    • Identification of therapist expectations of client adherence based on diagnosis

      Walters, Christine Piper (The University of Arizona., 1979)
    • Identification of two serotypes in squash mosaic virus strains

      Knuhtsen, Hjalmar Frederick Krum, 1935- (The University of Arizona., 1968)

      Chalker, Howard W. (The University of Arizona., 1976)
    • Identifying and protecting community values in western water : a survey of community leaders' perceptions towards rural-to-urban water transfers

      Oggins, Cy R.; Bradley, Michael D.; Ingram, Helen M. (The University of Arizona., 1990)
      The degree to which policymakers should facilitate or regulate water transfers is a controversial new issue on the western water policy agenda. While contemporary emphasis favors market solutions to water supply-and-demand problems, the reallocation of water from rural agricultural uses to urban municipal and industrial uses has generated interregional competition and conflict. Proponents praise water transfers as being economically efficient; other interests criticize market mechanisms for failing to protect community values. This thesis presents the results of a survey of 317 community leaders from Arizona, New Mexico and West Texas regarding water transfer impacts. Results indicate that both urban and rural leaders perceive that rural areas face significant losses from water transfers. The over-all perception of leaders that community losses are not compensable implies that assigning water decisions solely to the marketplace is unlikely to reduce social conflict and lower the transaction costs associated with water transfers.
    • Identifying Long Period Variable (LPV) Stars Using Images from the Stardial Observatory

      Slater, Timothy; Friedman, Vanessa Ann; Elfring, Lisa; Richardson, Randall (The University of Arizona., 2009)
      The study of variable stars is extremely important to the astronomical field of scientific research. Variable stars must be methodically studied, usually by amateur astronomers over a long period of time, in order to provide professional astronomers important data that allows them to further analyze variable star behavior.Variable stars are unique because their pulsation produces visible changes in luminosity. This pulsation allows amateur astronomers to visually observe and identify variable stars. This type of research and study is special because amateurs can make a real contribution to the field.My objective was to become an amateur astronomer in the hopes that I could discover variable stars and contribute my findings to the greater astronomical scientific community. In completing this task, my overall goal was to better understand the true nature of science in order to improve my teaching in a secondary science classroom.
    • Identifying Optimal Electron Donors to Promote Biosequestration of Uranium for an UMTRCA Title 1 Site

      Brusseau, Mark L.; Abel, Erin Jessica; Artiola, Janick F.; Zhong, Hua (The University of Arizona., 2016)
      Biostimulation is the use of in-situ microorganisms and added reagents in order to biosequester, precipitate, or absorb contaminants from contaminated groundwater and sediment. To test the effectiveness of this remediation approach at a particular site, small scale experiments, such as miscible-displacement, batch, or microcosm experiments, should be performed before a large-scale in-situ biosequestration electron donor injection. In this study, electron donor solutions containing contaminated groundwater and ethanol, acetate, benzoate, or glucose were injected into aquifer sediments collected from a UMTRCA Title 1 Site in Monument Valley, AZ. These experiments showed that ethanol, acetate, and glucose were effective electron donors for the stimulation of microbial activity in order to sequester uranium and reduce nitrate and sulfate concentrations. Conversely, benzoate was not effective at sequestering or reducing the contaminants. After electron-donor deficient groundwater was injected into the columns, a rebound of nitrate, sulfate, and uranium concentrations was observed. Due to this rebound, it was inferred that the mechanism of sequestration of uranium and hence reduction of nitrate and sulfate was due to the creation of reducing conditions via microbial activity. The insoluble reduced uranium was hypothesized to have precipitated or adsorbed to surrounding sediments. Incoming groundwater contained dissolved oxygen and therefore oxidized the reduced contaminants, consequently returning them into solution. It was hypothesized that a similar rebound would occur if ethanol, acetate, or glucose were to be injected in-situ due to sustained groundwater flow through the aquifer sediments on site.
    • Identifying Regulators of Lysosome Reformation: Inhibitor Screen in Mammalian Cell Culture

      Fares, Hanna; Liu, Ian; Laney, Jeff; Buchan, Ross (The University of Arizona., 2016)
      Lysosomes are membrane-bound organelles that have diverse functions in eukaryotic cells. Malfunctions in lysosomes result in a range of diseases known as Lysosomal Storage Disorders. After fusing with late endosomes to form hybrid organelles, lysosomes bud off and are reformed in a poorly characterized process known as lysosome formation or reformation. Only one mammalian regulator of lysosome formation has been identified, the non-selective cation channel TRPML1. In the highly similar process of Autophagic Lysosome Reformation (ALR), three known regulators have also been identified, the vesicle-coating protein clathrin and two phosphatidylinositol kinases that catalyze the formation of the membrane phospholipid PI(4,5)P₂. Here, we use an inhibitor screen coupled with a live imaging assay to identify the actin microfilament as a novel regulator of lysosome formation.
    • Identifying the Criteria That Sustain Livable Streets

      Choudhury, Angana; San Martin, Ignacio; Medlin, Larry; Domin, Christopher (The University of Arizona., 2008)
    • Identifying the spiritual needs of the oncology patient

      Slaughter, Terry Ann (The University of Arizona., 1979)
    • Identity development and personal expressiveness

      Erickson, Richard L.; Gordon, Lisa Lande, 1961- (The University of Arizona., 1989)
      A third defining dimension of identity has been proposed in addition to those of exploration and commitment. This study set out to demonstrate a relationship between identity scores as measured by the Extended Objective Measure of Ego-Identity Status and the third defining dimension, personal expressiveness, as measured by the Personal Expressiveness Activities Questionnaire. Results demonstrated a strong relationship between identity scores and expressiveness with a significant positive correlation between the achievement subscores and expressiveness, and significant negative correlations between the moratorium, foreclosure, and the diffusion subscores. The results appear to validate that expressiveness is indeed a third defining dimension of identity, however recommendations are made based on this study's findings regarding the adequacy of Waterman's Seven-Category Paradigm. Limitations and implications of the study are discussed.
    • The ideology of Nepal's Panchayati Raj

      Smith, Thomas Burns (The University of Arizona., 1967)
    • If you build it, they will come: The story of the Catalina Highway.

      Reid, J. Jefferson; Taylor, Peter Mark (The University of Arizona., 2005)
      The construction of the Catalina Highway began at the height of a worldwide economic depression, when a huge portion of the workforce was unemployed and capital funds were hard to come by. Federal prisoners provided most of the labor in the eighteen-year project, which began in 1933 and ended in 1951, spanning the eras of the Great Depression and World War II, periods of sustained national shortages of material and equipment. Convict labor was considered the only affordable means of constructing the road (United States Department of Commerce [USDC] 1951:13). This thesis examines the work and labor correlates represented in the material culture of the road features and the attendant prison camp that was constructed to house the workforce for the Catalina Highway project. The thesis also examines the working and living conditions of the inmates and how the inmates were perceived by the community. The thesis employs the recognized historical and archaeological methods of archival, ethnographic, and archaeological research to achieve its ends.