2,863 Matching Results

Search Results

A Comparison of the Roles and Needs of Middle and Lower Class Thai Parents in Helping Their Children's Reading Development

Description: The problem of this study was a comparison of the roles and needs of middle and lower class Thai parents in helping their children's reading development. The sample was selected from the parents of the preprimary schools in Bangkok, Thailand, in the fall of 1986. A total of 366 parents, including 185 from middle class and 181 from lower class, participated in this study.
Date: May 1987
Creator: Nitaya Praphruitkit
Partner: UNT Libraries


Description: Unsaturated drip tests have been used to investigate the alteration of unirradiated UO{sub 2} and spent UO{sub 2} fuel in an unsaturated environment, such as may be expected in the proposed repository at Yucca Mountain. In these tests, simulated groundwater is periodically injected onto a sample at 90 C in a steel vessel. The solids react with the dripping groundwater and water condensed on surfaces to form a suite of U(VI) alteration phases. Solution chemistry is determined from leachate at the bottom of each vessel after the leachate stops interacting with the solids. A more detailed knowledge of the compositional evolution of the leachate is desirable. By providing just enough water to maintain a thin film of water on a small quantity of fuel in batch experiments, we can more closely monitor the compositional changes to the water as it reacts to form alteration phases.
Date: May 11, 1998
Creator: Finch, Robert J.; Wolf, Stephen F.; Hanchar, John M. & Bates, John K.
Partner: UNT Libraries Government Documents Department


Description: A deterministic method for solving the time-dependent, three-dimensional Boltzmam transport equation with explicit representation of delayed neutrons has been developed and evaluated. The methodology used in this study for the time variable of the neutron flux is known as the improved quasi-static (IQS) method. The position, energy, and angle-dependent neutron flux is computed deterministically by using the three-dimensional discrete ordinates code TORT. This paper briefly describes the methodology and selected results. The code developed at the University of Tennessee based on this methodology is called TDTORT. TDTORT can be used to model transients involving voided and/or strongly absorbing regions that require transport theory for accuracy. This code can also be used to model either small high-leakage systems, such as space reactors, or asymmetric control rod movements. TDTORT can model step, ramp, step followed by another step, and step followed by ramp type perturbations. It can also model columnwise rod movement can also be modeled. A special case of columnwise rod movement in a three-dimensional model of a boiling water reactor (BWR) with simple adiabatic feedback is also included. TDTORT is verified through several transient one-dimensional, two-dimensional, and three-dimensional benchmark problems. The results show that the transport methodology and corresponding code developed in this work have sufficient accuracy and speed for computing the dynamic behavior of complex multidimensional neutronic systems.
Date: January 14, 1998
Creator: Goluoglu, S.; Bentley, C.; DeMeglio, R.; Dunn, M.; Norton, K.; Pevey, R. et al.
Partner: UNT Libraries Government Documents Department

Electroproduction of Photons and of Pawns on the Proton in Quadrimoment of Transfer Q2=1.0GeV2. Measure Cross Sections and Extraction of Polarizabilities Generalities; Electroproduction de Photons et de Pions sur le Proton au Quadrimoment de Transfert Q2=1.0GeV2. Mesure des Sections Efficaces et Extraction des Polarisabilites Generalisees

Description: In hadronic physics, the nucleon structure and the quarks confinement are still topical issues. The neutral pion electroproduction and virtual Compton scattering (VCS) reactions allow us to access new observables that describe this structure. This work is focused on the VCS experiment performed at Jefferson Lab in 1998.
Date: November 6, 2001
Creator: Laveissiere, Geraud
Partner: UNT Libraries Government Documents Department

Validation on the thermal effect of roof with the spraying and green plants in an insulated building

Description: In recent years, roof-spraying and rooftop lawns has proved effective on roofs with poor thermal insulation. However, roofs of most buildings have insulating material to provide thermal insulation during the winter. The effects of such a practice have not previously been quantified. In this study, the authors conducted measurements of an insulated building to quantify the thermal effects of roof-spraying and rooftop lawns. Roof-spraying did not significantly reduce cooling loads, and required significant amounts of water. The conclusion is that roof spraying is not suitable for buildings with well-insulated roofs. Rooftop lawns, however, significantly stabilized the indoor temperature while additionally helping to mitigate the heat island phenomenon.
Date: March 20, 2004
Creator: Zhou, Nan; Gao, Weijun; Nishida, Masaru & Ojima, Toshio
Partner: UNT Libraries Government Documents Department

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (Japanese translation)

Description: The August 2003 blackout of the northeastern U.S. and CANADA caused great economic losses and inconvenience to New York City and other affected areas. The blackout was a warning to the rest of the world that the ability of conventional power systems to meet growing electricity demand is questionable. Failure of large power systems can lead to serious emergencies. Introduction of on-site generation, renewable energy such as solar and wind power and the effective utilization of exhaust heat is needed, to meet the growing energy demands of the residential and commercial sectors. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems. This work demonstrates a method for choosing and designing economically optimal DER systems. An additional purpose of this research is to establish a database of energy tariffs, DER technology cost and performance characteristics, and building energy consumption for Japan. This research builds on prior DER studies at the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL) and with their associates in the Consortium for Electric Reliability Technology Solutions (CERTS) and operation, including the development of the microgrid concept, and the DER selection optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills, given performance and cost data on available DER technologies, utility tariffs, and site electrical and thermal loads over a test period, usually an historic year. Since hourly electric and thermal energy data are rarely available, they are typically developed by building simulation for each of six end use loads used to model the building: electric-only loads, space heating, space cooling, refrigeration, water heating, and natural-gas-only loads. DER-CAM provides a global optimization, albeit idealized, that shows how the ...
Date: October 15, 2004
Creator: Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun & Nishida, Masaru
Partner: UNT Libraries Government Documents Department

Partnership to Advance Alternative Fuel Vehicles; Ciudades Limpias: Alianza Para Promover El Uso De Vehiculos De Combustibles Alternativos

Description: This fact sheet provides a question and answer overview of the Clean Cities program including what it is, how it works, the program's accomplishments, and a map of Clean Cities throughout the United States.
Date: October 1, 2001
Creator: LaRocque, T.
Partner: UNT Libraries Government Documents Department

Energia Renovable para Centros de Salud Rurales (Renewable Energy for Rural Health Clinics)

Description: Esta es la primera de una serie de guias de aplicaciones que el Programa de Energia de Villas de NREL esta comisionando para acoplar sistemas comerciales renovables con aplicaciones rurales, incluyendo agua, escuelas rurales y micro empresas. La guia esta complementada por las actividades de desarrollo del Programa de Energia de Villas de NREL, proyectos pilotos internacionales y programas de visitas profesionales.
Date: July 28, 1999
Creator: Jimenez, T. & Olson, K.
Partner: UNT Libraries Government Documents Department

Energy Savers: Tips for Saving Energy and Money at Home; El Ahorro de Energa: Sugerencias para ahorrar energa y dinero en el hogar

Description: The Department of Energy of the United States of America works to guarantee provisions of safe energy, reliable and economically accessible to support to one developing economy and to protect the atmosphere. These suggestions and ideas to increase the energy efficiency in their house represent simple ways in which our citizens can contribute to preserve the atmosphere at world-wide level, to reduce the level of contamination of the air and to reserve our natural resources for future generations. [Spanish] El Departamento de Energa de los Estados Unidos de America trabaja para garantizar suministros de energa seguros, confiables y econmicamente accesibles para apoyar a una economa en desarrollo y proteger el medio ambiente. Estas sugerencias e ideas para aumentar la eficiencia energetica en su casa representan maneras sencillas en que nuestros ciudadanos pueden contribuir a preservar el medio ambiente a nivel mundial, a reducir el nivel de contaminacin del aire y a reservar nuestros recursos naturales para las generaciones futuras.
Date: June 1, 2000
Creator: Jones, J.
Partner: UNT Libraries Government Documents Department

[Portrait of Hazel Petrey and Gilbert Dove]

Description: Photograph of Hazel Petrey and Gilbert Dove standing on a fence. In the image, they stand on bridge connected two lands between wood fences. They will be wed soon after this photo is taken. Narrative by Junebug Clark: More images and information can be found in the July 28, 1941 issue of Life Magazine, pages 82-85 in the story “Life Magazine Goes to a Kentucky Wedding.” Also in the Joe Clark, HSSS book “Country Wedding" published in 1974. Additionally a 1982 photo of Hazel and Gilbert can be found in Joe Clark’s Tennessee Scrapbook. All are in the Clark Family Collection.
Date: June 14, 1941
Creator: Clark, Joe
Partner: UNT Libraries Special Collections

Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory

Description: The past decade has seen a strong evolution of the study of the hadron structure through exclusive processes, allowing to access to a more complete description of this structure. Exclusive processes include DVCS (Deeply Virtual Compton Scattering) as well as hard exclusive meson production. This document is particularly focussed on the latter, and more particularly on exclusive neutral pion production. In this thesis is described the analysis of triple coincidence events H(e, e'{gamma}{gamma})X, which were a consequent by-product of the DVCS experiment which occured during Fall 2004 at Jefferson Lab Hall A, to extract the ep {yields} ep{pi}{sup 0} cross section. This cross section has been measured at two values of four-momentum transfer Q{sup 2} = 1.9 GeV{sup 2} and Q{sup 2} = 2.3 GeV{sup 2}. The statistical precision for these measurements is achieved at better than 5 %. The kinematic range allows to study the evolution of the extracted cross section as a function of Q{sup 2} and W. Results are be confronted with Regge inspired calculations and Generalized (GPD) predictions. An intepretation of our data within the framework of semi-inclusive deep inelastic scattering is also discussed.
Date: June 1, 2010
Creator: Fuchey, Eric
Partner: UNT Libraries Government Documents Department

NON-UNIFORM HEAT GENERATION EXPERIMENTAL PROGRAM. Quarterly Progress Report No. 2, September-December 1963

Description: Experimental and analytical investigations are being conducted to determine the effects of irregular heat flow through reactor channels on the operating conditions that cause burnout (departure from nucleate boiling). Time was spent de signing, procuring, fabricating, and formulating plans in preparation for the initial test work. The bus bars, loop piping, and Test Section No. 1 were completed and installed except for the final connections. The primary elements for the instrumentation and control modifications are ready for installation. Considerable effort was expended to obtain a satisfactory supply source for the non-uniform test sections. It appears that the azimuthal variation of heat generation will be between plus or minus 2.5 to 5%. Procedures are being formulated for checking out the equipment and loop modifications prior to test operations. (auth)
Date: October 31, 1964
Creator: Judd, D.F.; Wilson, R.H.; Swenson, H.S.; Lee, R.A. & Ackerman, J.W.
Partner: UNT Libraries Government Documents Department

Study, design and realization of a Fabry-Perot cavity for the Compton polarimeter of TJNAF; Etude, conception et realisation d'une cavite Fabry-Perot pour le polarimetre Compton de TJNAF

Description: This is a doctoral dissertation, in French, on the subject of study, design and realization of a Fabry-Perot cavity for the Compton polarimeter of TJNAF.
Date: January 1, 2001
Creator: Falletto, M. Nicolas
Partner: UNT Libraries Government Documents Department

Zirconium and technetium recovery and partitioning in the presence of actinides in modified Purex process for ATW program. Final report

Description: The modified Purex process flowsheet is based on combination of all irradiated materials, their joint dissolution and reprocessing as a NPP spent fuel solution with abnormal Pu content after addition of recycled depleted U concentrate. Some groups of long-lived radionuclides could be completely recovered and localized at the stage of extraction reprocessing using 30% TBP. Studies were conducted for 10 y to develop the process for recovery, concentration, and localization of U, Pu, Np, Tc, and Zr within 1st extraction cycle. Actinides are recovered from high-level raffinate of this cycle after evaporation and feed adjustment. Results in this report show that combined deep recovery of several elements from highly irradiated materials by TBP extraction, for further transmutation, is possible. Selective stripping of Zr from solvent phase containing U, Pu, Np, and Tc is quite effective. Development of the modified Purex process is not complete; main problem to be solved should be oxide separation from the loop and permissible storage duration before reprocessing and reuse in the loop.
Date: December 31, 1994
Creator: Dzekun, E.G.; Fedorov, Y.S.; Galkin, B.Y.; Lyubtsev, R.I.; Mashkin, A.N.; Mishin, E.N. et al.
Partner: UNT Libraries Government Documents Department

Argonne premium coal sample program. Annual technical progress report. Reporting period : 2/2006-2/2007.

Description: This project provides highly uniform, premium (unexposed to oxygen) coal samples to researchers investigating coal structure, properties and behavior, and maintains accessible databases of published reports describing work carried out on the Argonne Premium Coal Samples. The samples are made available to DOE researchers and others. The eight carefully selected samples have been kept in as pristine a condition as possible through careful control the conditions in all stages from sample collection throughout processing and packaging. The samples are available in glass ampoules to ensure sample uniformity and maintain premium quality to ensure sample integrity.
Date: March 4, 2007
Creator: Hunt, J. E. & Chemistry
Partner: UNT Libraries Government Documents Department