Now showing items 9894-9913 of 19159

    • G 240-72 -- A New Magnetic White Dwarf with Unusual Polarization

      Angel, J. R. P; Hintzen, P. M. N. O.; Strittmatter, P. A.; Martin, P. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974)
      GD 240 72 ( =LP44 -113), a DC white dwarf, is found to show elliptical polarization. There is no evidence of variability. The circular component, typically 0.5 %,changes sign with wavelength, being negative in blue light a and positive in red. There is /relatively strong component of linear polarization, 1.4% in blue light.
    • Gahi-2 Hybrid Millet Seed Production in the Salt River Valley

      Voigt, Robert Lee (Agricultural Experiment Station, University of Arizona (Tucson, AZ), 1963-06)
    • GAINING PERSPECTIVE THROUGH EXPRESSIVE WRITING

      Lake, Allison Katherine (The University of Arizona., 2009-05)
    • Gaining Strategic Advantage through Bibliomining: Data Mining for Management Decisions in Corporate, Special, Digital, and Traditional Libraries

      Nicholson, Scott; Stanton, Jeffrey M.; Nemati, H.; Barko, C. (Hershey, PA: Idea Group Publishing, 2003)
      Library and information services in corporations, schools, universities, and communities capture information about their users, circulation history, resources in the collection, and search patterns (Koenig, 1985). Unfortunately, few libraries have taken advantage of these data as a way to improve customer service, manage acquisition budgets, or influence strategic decision-making about uses of information in their organizations. In this chapter, we present a global view of the data generated in libraries and the variety of decisions that those data can inform. We describe ways in which library and information managers can use data mining in their libraries, i.e. bibliomining, to understand patterns of behavior among library users and staff members and patterns of information resource use throughout the institution. The chapter examines data sources and possible applications of data mining techniques and explores the legal and ethical implications of data mining in libraries.
    • Galaxies, The Redshift, and Gravity

      Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974-04)
      When apparent velocities of galaxies in clusters, measured by the red - shift, are correlated against magnitude and morphology, strong non -dynamical correlations emerge. The details of the correlations are used to develop a logical theory for the existance of multiple substates of matter, presumably involving the substructure of fundamental particles. Transitions between substates in a time systematic sense are presumed to occur under the ultimate conditions existant in the cores of black holes in galaxy nuclei. Subsequent separation of states and the interrelations between galaxies require that different substates of matter be non -interactive gravitationally.
    • Galaxy Photometry. I. Techniques

      Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1973-01)
      Techniques for the derivation of nuclear magnitudes in galaxies are summarized. A new method for rapid estimation of nuclear magnitudes by iris photometry is presented and evaluated. It is concluded that with proper calibration, nuclear magnitudes for galaxies in clusters may be estimated with an uncertainty of about ±0.1 magnitude.
    • Game Food

      Maurer, Jaclyn; Houtkooper, Linda; Nutritional Sciences (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2005-07)
      This handout reviews pre-game meal planning tips for young athletes. It also provides example foods and tips of what and when to eat and drink.
    • Gamma Irradiation of Pollen of Marker Lines for the Isolation of Plants Deficient for Specific Chromosomes

      Endrizzi, J. E.; Taylor, T. E.; Department of Plant Breeding (College of Agriculture, University of Arizona (Tucson, AZ), 1969-02)
    • Gangnam Style: Alcohol and the Cardiovascular System (Comparing US and South Korea)

      Cohen, Zoe; Oh, Jeeeun (The University of Arizona., 2015)
      The relationship between alcohol and the cardiovascular system (CVS) can have serious effects on the whole system. Excessive consumption causes damage while moderate consumption (1 drink/day for women; 2 drinks/day for men) can be protective. Moderate alcohol intake has been proven to show health benefits by increasing levels of high-density lipoprotein cholesterol and preventing clot formation which reduces the risk of coronary heart disease, stroke, and diabetes. However, excessive alcohol intake can lead to development of chronic diseases. By comparing alcohol consumption between the US and South Korea, it was discovered that factors such as location, culture, as well as, occupation, play a role in both the type and amount of alcohol consumed. In both nations, alcohol consumption has been increasing each year. A study showed that 16,749 deaths were due to alcoholic liver disease in 2011 in the United States. In Korea, the percentage of cases of chronic liver diseases as incidences of acute pancreatitis have increased. Lastly, although many studies show the affect of alcohol on arteries and arterioles, not much work has been done on capillaries and veins.
    • GANNET: A machine learning approach to document retrieval

      Chen, Hsinchun; Kim, Jinwoo, 1963- (M.E. Sharpe, Inc., 1994-12)
      Information science researchers have recently turned to new artificial intelligence-based inductive learning techniques including neural networks, symbolic learning and genetic algorithms. An overview of the new techniques and their usage in information science research is provided. The algorithms adopted for a hybrid genetic algorithms and neural nets based system, called GANNET, are presented. GANNET performed concept (keyword) optimization for user-selected documents during information retrieval using the genetic algorithms. It then used the optimized concepts to perform concept exploration in a large network of related concepts through the Hopfield net parallel relaxation procedure. Based on a test collection of about 3,000 articles from DIALOG and an automatically created thesaurus, and using Jaccard's score as a performance measure, the experiment showed that GANNET improved the Jaccard's scores by about 50% and helped identify the underlying concepts that best describe the user-selected documents.
    • Garbanzo Bean Weed Control Study

      Umeda, K.; MacNeil, D.; Byrne, David N.; Baciewicz, Patti (College of Agriculture, University of Arizona (Tucson, AZ), 1999-10)
      Pendimethalin (Prowl7) and oxyfluorfen (Goal7) applied preemergence (PREE) caused minimal injury and gave very good weed control (>90%). Goal and sulfentrazone alone applied postemergence (POST) gave very good weed control at 6 WAT. The combination of Prowl followed by Goal or sulfentrazone gave complete control of all weeds. Goal and sulfentrazone applied POST following PREE treatments gave nearly complete weed control with good crop safety. Clomazone (Command7) caused significant crop injury and stand reduction when applied PREE. Metribuzin (Sencor7) applied POST completely reduced the crop stand and gave complete control of all weeds. Metolachlor (Dual7), dimethenamid (Frontier7), Sencor, flumetsulam, and imazamox generally did not provide acceptable control of Chenopodium desiccatum (narrowleaf lambsquarters) and Sonchus oleraceus (sowthistle). Bentazon (Basagran7), acifluorfen (Blazer7), and fomesafen (Reflex7) were not effective against narrowleaf lambsquarters but gave adequate control of the other weeds.
    • The Garman Kohlhagen Model for Foreign Exchange Option Pricing: Derivation and Application

      Brio, Moysey; Krishnaswamy, Roopa (The University of Arizona., 2014)
    • Garry Winogrand: Early Work

      Center for Creative Photography, University of Arizona (Tucson, AZ), 1990-04-06
    • GAS PHASE MICROWAVE SPECTROSCOPY AND INSTRUMENT DEVELOPMENT ON A DOUBLE RESONANCE EXPERIMENT

      Kukolich, Stephen G.; Li, Kexin (The University of Arizona., 2016)
      High resolution rotational spectroscopy is a powerful technique to identify and characterize the accurate structures of volatile, polar and relatively rigid molecules. The first Pulse Beam Fourier transform microwave (FTMW) spectroscopy was constructed by Flygare and Balle in 1981 and provided great improvements in sensitivity and resolution in molecular spectroscopy. The double resonance FTMW spectrometer uses a new method to probe the rotational transitions that share a common quantum state. The linkage information can be used to assign weak transitions. We want to present the current work on hardware and software updates on the instrumentation. The theoretical models such as density functional theory and ab-initio method are used to provide initial estimates for microwave measurement parameters and to help guide transition assignments.
    • GASEOUS LOSSES OF NITROGEN FROM ARIZONA SOILS

      Hamdallah, Ghassan Mohammad, 1943- (The University of Arizona., 1977)
    • Gasification of Algae for the Production of CNG

      Seamans, Kimberly Anne (The University of Arizona., 2010-05)
      This project involved designing a process that converts algae into compressed natural gas (CNG). The algae enter the process in a water slurry at 2.5% algae by mass. The algae are then converted into methane and other gases at supercritical conditions in a reactor. The gas mixture is then purified by removing the carbon dioxide and hydrogen gases. The sellable products this process produces are CNG and hydrogen. In addition, the carbon dioxide and salts are recycled back to the algae farms. This makes the process environmentally responsible as the carbon dioxide created in the process is not released to the atmosphere. Before the process is built, it is recommended that the reactor and salt separator technologies are tested on a pilot scale to ensure their viability on an industrial scale. A process hazard analysis was completed as a part of this project in order to eliminate any safety issues with the process. Despite the process and equipment optimizations that were performed, the economic analysis suggested that the process is not economically viable. However, it may become viable in the future through the development of the catalyst and equipment technologies.
    • Gasification of Algae for the Production of CNG

      Ronan, Zachary Wayne (The University of Arizona., 2010-05)
      The goal of this project is to create compressed natural gas (CNG) from methane. This process is intended to serve as an environmentally friendly supplement to other sources of natural gas, such as the natural gas found alongside fossil fuels. Algae are to be converted into natural gas in supercritical water at an algae mass percent of 2.5%. The reactor uses a ruthenium catalyst on a carbon structure. The process is environmentally friendly because the carbon dioxide produced in the reactor and the furnace is recycled back to algae farms, thereby significantly reducing the net carbon dioxide emissions. Also, the salts that are removed from the algae are recycled to the algae farms thereby eliminating any potentially toxic byproducts. A process hazard analysis was completed to reduce any potential safety concerns involved with the process. An economic analysis was performed and the process was determined to not be economically viable at the current time. However, improved catalyst and process equipment technologies could lead to the process becoming profitable in the future. Future work for the process involves pilot scale testing of the reactor and the gravitational salt separator to test their feasibility on an industrial scale.
    • Gasoline Engine Troubles and the Care and Operations of Gasoline Engines

      Smith, G. E. P. (College of Agriculture, University of Arizona (Tucson, AZ), 1913-07-01)
    • Gegenschein Observations

      Douglass, A.E. (1894)
    • Gems and Precious Stones of Arizona

      Culin, F.L., Jr. (University of Arizona Bureau of Mines, 1917-02-06)