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UNT Libraries Government Documents Department
140
Oklahoma Historical Society
58
UNT Libraries Special Collections
32
Sterling Municipal Library
10
Comanche Public Library
9
UNT Libraries
7
Alvin Community College
5
Bastrop Public Library
5
Carl Albert Congressional Research and Studies Center
5
The Colony Public Library
4
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Texas Digital Newspaper Program
132
Office of Scientific & Technical Information Technical Reports
98
Tocker Foundation Grant
74
Oklahoma Digital Newspaper Program
64
Congressional Research Service Reports
35
KXAS-NBC 5 News Collection
20
Chickasha Newspaper Collection
16
Altus Times-Democrat
10
The Baytown Sun
10
Sapulpa Herald
10
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Inference of extractable soil moisture in the plant root zone at the Walnut River Watershed.
Soil moisture content is a crucial variable in studies of hydrology, meteorology, and plant sciences. Soil moisture content influences the ability of land to hold additional water from precipitation and thus affects groundwater levels and runoff. Evapotranspiration rates are strongly influenced by soil moisture content near the surface; evapotranspiration regulates surface air temperature and is a major factor in modifying the water vapor content of the atmosphere. Adequate soil moisture is essential for plant growth; excesses and deficits of soil moisture must be considered in agricultural management practices. Soil moisture can be measured by a variety of in situ techniques, but such techniques often are inadequate for evaluation over large areas because of strong temporal and spatial variations. Here, a technique using standard surface meteorological observations together with remote sensing data from satellites is discussed.
Date:
October 5, 1998
Creator:
Song, J.
Object Type:
Article
System:
The UNT Digital Library
Isobar Separators for Radioactive Ion Beam Facilities
A radioactive ion beam facility - in short a RIB facility - produces ions of short-lived nuclei and accelerates them to energies of 0.1�10 MeV per nucleon or even higher. In this process it is important that the resulting RIB beams are free from nuclei of neighboring isobars or of neighboring elements. This task requires the production and ionization of the nuclei of interest as well as separating them from all others with a high-mass resolving power and small-mass cross contaminations. When constructing such a facility it also is very important to find ways that allow the accelerated ions to be provided to different experiments at least quasi simultaneously.
Date:
October 5, 1998
Creator:
Garrett, J.D. & Wollnik, H.
Object Type:
Article
System:
The UNT Digital Library
Laser ablation of concrete.
Laser ablation is effective both as an analytical tool and as a means of removing surface coatings. The elemental composition of surfaces can be determined by either mass spectrometry or atomic emission spectroscopy of the atomized effluent. Paint can be removed from aircraft without damage to the underlying aluminum substrate, and environmentally damaged buildings and sculptures can be restored by ablating away deposited grime. A recent application of laser ablation is the removal of radioactive contaminants from the surface and near-surface regions of concrete. We present the results of ablation tests on concrete samples using a high power pulsed Nd:YAG laser with fiber optic beam delivery. The laser-surface interaction was studied on various model systems consisting of Type I Portland cement with varying amounts of either fine silica or sand in an effort to understand the effect of substrate composition on ablation rates and mechanisms. A sample of non-contaminated concrete from a nuclear power plant was also studied. In addition, cement and concrete samples were doped with non-radioactive isotopes of elements representative of cooling waterspills, such as cesium and strontium, and analyzed by laser-resorption mass spectrometry to determine the contamination pathways. These samples were also ablated at high power to …
Date:
October 5, 1998
Creator:
Savina, M.
Object Type:
Article
System:
The UNT Digital Library
[Lee College students in park]
Photograph of a group of young adults wearing shorts and t-shirts walking down a path in a park. Text on back of photo: Anthony Walton, second from right, from Missouri City hauls out debris from a Baytown park during the Uniting Students through Athletic club annual park clean-up. Walton is a freshman forward for the Lee College Runnin' Rebel basketball team. The Rebels regular season begins at home Nov 2 when they take on the Baytown Hoyas. 10-5-98
Date:
October 5, 1998
Creator:
Lee College
Object Type:
Photograph
System:
The Portal to Texas History
[Letter about Leadership Lambda Seminar, October 5, 1998]
2 pages: Letter to Leadership Lambda Seminar Participant, 5 October 1998, and Yahoo! Maps print out of a map of Reagan & Brown, Dallas, TX 75219. The letter includes an invitation to Session #4 of the Seminar Series, "Follow Me: The Principles of Leadership," and directors to a Community Center.
Date:
October 5, 1998
Creator:
Leadership Lambda, Inc.
Object Type:
Letter
System:
The UNT Digital Library
LiMn{sub 2-x}Cu{sub x}O{sub 4} spinels (0.1 {le} x {le} 0.5) - a new class of 5 V cathode materials for Li batteries : I. electrochemical, structural and spectroscopic studies.
A series of electroactive spinel compounds, LiMn{sub 2{minus}x}Cu{sub x}O{sub 4} (0.1 {le} x {le} 0.5) has been studied by crystallographic, spectroscopic and electrochemical methods and by electron-microscopy. These LiMn{sub 2{minus}x}Cu{sub x}O{sub 4} spinels are nearly identical in structure to cubic LiMn{sub 2}O{sub 4} and successfully undergo reversible Li intercalation. The electrochemical data show a remarkable reversible electrochemical process at 4.9 V which is attributed to the oxidation of Cu{sup 2+} to Cu{sub 3+}. The inclusion of Cu in the spinel structure enhances the electrochemical stability of these materials upon cycling. The initial capacity of LiMn{sub 2{minus}x}Cu{sub x}O{sub 4} spinels decreases with increasing x from 130mAh/g in LiMn{sub 2}O{sub 4} (x=0) to 70 mAh/g in ''LiMn{sub 1.5}Cu{sub 0.5}O{sub 4}'' (x=0.5). The data also show slight shifts to higher voltage for the delithiation reaction that normally occurs at 4.1 V in standard Li{sub 1{minus}x}Mn{sub 2}O{sub 4} electrodes (1 {ge} x {ge} 0) corresponding to the oxidation of Mn{sup 3+} to Mn{sup 4+}. Although the powder X-ray diffraction pattern of ''LiMn{sub 1.5}Cu{sub 0.5}O{sub 4}'' shows a single-phase spinel product, neutron diffraction data show a small, but significant quantity of an impurity phase, the composition and structure of which could not be identified. X-ray …
Date:
October 5, 1998
Creator:
Ein-Eli, Y.
Object Type:
Article
System:
The UNT Digital Library
Measured Ni-63 Contents in Savannah River Site High Level Waste and Defense Waste Processing Facility Glass Product by Ni-Selective Ion Exchange Purification and b-Decay Counting
In this paper is described tests of EiChrom Industries' Ni-selective ion exchange resin for use in analysis of Ni-63 in Savannah River Site high level waste.
Date:
October 5, 1998
Creator:
Dewberry, R. A.
Object Type:
Article
System:
The UNT Digital Library
A Multi-Sample Cs-Sputter Negative Ion Source
A multi-sample Cs sputter negative-ion source, equipped with a conical-geometry, W-surface-ionizer has been designed and fabricated that permits sample changes without disruption of on-line accelerator operation. Sample changing is effected by actuating an electro-pneumatic control system located at ground potential that drives an air-motor-driven sample-indexing-system mounted at high voltage; this arrangement avoids complications associated with indexing mechanisms that rely on electronic power-supplies located at high potential. In-beam targets are identified by LED indicator lights derived from a fiber-optic, Gray-code target-position sensor. Aspects of the overall source design and details of the indexing mechanism along with operational parameters, ion optics. intensities, and typical emittances for a variety of negative-ion species will be presented in this report.
Date:
October 5, 1998
Creator:
Alton, G. D.; Ball, J. A.; Bao, Y.; Cui, B.; Reed, C. A. & Williams, C.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Lewisville drowning]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
October 5, 1998, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 38, Ed. 1 Monday, October 5, 1998
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 5, 1998
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 105, No. 194, Ed. 1 Monday, October 5, 1998
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 5, 1998
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Plans for Constructing a Next-Generation ISOL Facility at ORNL
The U.S. Nuclear Science Community in its 1996 Long Range Plan identified an advanced radioactive ion beam (RIB) facility based on the ISOL technique as the next major facility to be constructed for U.S. nuclear physics. The proposed SpaHation Neutron Source (SNS) for Oak Ridge National Laboratory, whose construction design funds have recently been appropriated, offers a unique opportunity for the construction of this new facility, Plans for extracting a proton beam from the SNS, transporting it to the RIB facility, and constructing the new RIB facility at the SNS site are discussed, as are the ISOL targets, radiation handling, isobaric separation, acceleration of beams of radioactive experimental areas.
Date:
October 5, 1998
Creator:
Garrett, J.D.
Object Type:
Article
System:
The UNT Digital Library
Precision Studies of Nuclei
This grant covers the period Sept. 1, 1994 to Aug. 31, 1996 with an extension to Dec. 31, 1996. The main activities funded by this research grant include work on the TJNAF (formerly CEBAF) Hall A data analysis software project and other projects in Hall A worked on by my graduate students. All of these projects are necessary for the functioning of Hall A and are therefore directly related to my Hall A research program. The Hall A experimental equipment is still in the commissioning phase with the first experiment expected to be performed in May of 1997. My effort has focused on software development, in particular on analyzing and calibrating the vertical drift chambers (VDCs) which will be used for particle tracking in the high resolution spectrometers. I have written a standalone program to determine calibration constants needed to obtain the ultimate position and angle resolution. High resolution performance will be paramount for much of the Hall A experimental program. In particular, I am spokesman on an experiment to separate the response functions in the d(e,e{prime}p)n reaction. In order to make meaningful comparisons with theory, this experiment requires accurate determination of the cross sections and it will therefore be …
Date:
October 5, 1998
Creator:
Ulmer, Paul E.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Ionization Efficiencies of {sup 11}C and {sup 14}O with the LBNL ECR Ion Sources
High charge states, up to fully stripped {sup 11}C and {sup 14}O ion, beams have been produced with the electron cyclotron resonance ion sources (LBNL, ECR and AECR-U) at Lawrence Berkeley National Laboratory. The radioactive atoms of {sup 11}C and {sup 14}O were collected in batch mode with an LN{sub 2} trap and then bled into the ECR ion sources. Ionization efficiency as high as 11% for {sup 11}C{sup 4+} was achieved.
Date:
October 5, 1998
Creator:
Xie, Z.Q.; Cerny, J.; Guo, F.Q.; Joosten, R.; Larimer, R.M.; Lyneis, C.M. et al.
Object Type:
Article
System:
The UNT Digital Library
Preliminary Pulsing Experiments to Measure Delayed Neutron Emission Parameters
Recent interest in delayed neutron parameters including comparisons between macroscopic (experimental) and microscopic (calculated) results have prompted a set of experiments using the 1MW Triga Reactor at the Texas A and M University (TAMU) Nuclear Science Center (NSC) designed to measure the complete set of seven-group delayed neutron parameters for several higher actinides. Operating the Nuclear Science Center Reactor (NSCR) in a pulsed mode, a complete set of delayed neutron parameters were measured for Np-237 and Am-243. The total delayed neutron yield per 100 fissions for Np-237 and Am-243 was found to be 1.14 {+-} 0.07 and 0.85 {+-} 0.05, respectively. Comparisons to previous measurements are made where such measurements are available.
Date:
October 5, 1998
Creator:
Charlton, W. S.; Parish, T. A. & Raman, S.
Object Type:
Article
System:
The UNT Digital Library
Regional emissions of air pollutants in China.
As part of the China-MAP program, sponsored by the US National Aeronautics and Space Administration, regional inventories of air pollutants emitted in China are being characterized, in order that the atmospheric chemistry over China can be more fully understood and the resulting ambient concentrations in Chinese cities and the deposition levels to Chinese ecosystems be determined with better confidence. In addition, the contributions of greenhouse gases from China and of acidic aerosols that counteract global warming are being quantified. This paper presents preliminary estimates of the emissions of some of the major air pollutants in China: sulfur dioxide (SO{sub 2}), nitrogen oxides (NO{sub x}), carbon monoxide (CO), and black carbon (C). Emissions are estimated for each of the 27 regions of China included in the RAINS-Asia simulation model and are subsequently distributed to a 1{degree} x 1{degree} grid using appropriate disaggregation factors. Emissions from all sectors of the Chinese economy are considered, including the combustion of biofuels in rural homes. Emissions from larger power plants are calculated individually and allocated to the grid accordingly. Data for the period 1990-1995 are being developed, as well as projections for the future under alternative assumptions about economic growth and environmental control.
Date:
October 5, 1998
Creator:
Streets, D. G.
Object Type:
Article
System:
The UNT Digital Library
Regulatory Closure Options for the Residue in the Hanford Site Single-Shell Tanks
Liquid, mixed, high-level radioactive waste (HLW) has been stored in 149 single-shell tanks (SSTS) located in tank farms on the U.S. Department of Energy's (DOE's) Hanford Site. The DOE is developing technologies to retrieve as much remaining HLW as technically possible prior to physically closing the tank farms. In support of the Hanford Tanks Initiative, Sandia National Laboratories has addressed the requirements for the regulatory closure of the radioactive component of any SST residue that may remain after physical closure. There is significant uncertainty about the end state of each of the 149 SSTS; that is, the nature and amount of wastes remaining in the SSTS after retrieval is uncertain. As a means of proceeding in the face of these uncertainties, this report links possible end-states with associated closure options. Requirements for disposal of HLW and low-level radioactive waste (LLW) are reviewed in detail. Incidental waste, which is radioactive waste produced incidental to the further processing of HLW, is then discussed. If the low activity waste (LAW) fraction from the further processing of HLW is determined to be incidental waste, then DOE can dispose of that incidental waste onsite without a license from the U.S. Nuclear Regulatory Commissions (NRC). The …
Date:
October 5, 1998
Creator:
Cochran, J.R. Shyr, L.J.
Object Type:
Report
System:
The UNT Digital Library
Relativistic-klystron two-beam accelerator as a power source for future linear colliders
The technical challenge for making two-beam accelerators into realizable power sources for high-energy colliders lies in the creation of the drive beam and in its propagation over long distances through multiple extraction sections. This year we have been constructing a 1.2&A, l-MeV, induction gun for a prototype relativistic klystron two-beam accelerator (RK-TBA). The electron source will be a 8.9 cm diameter, thermionic, flat-surface cathode with a maximum shroud field stress of approximately 165 kV/cm. Additional design parameters for the injector include a pulse length of over 150-ns flat top (1% energy variation), and a normalized edge emittance of less than 300 pi-mm-n-n. The prototype accelerator will be used to study physics, engineering, and costing issues involved in the application of the RK-TBA concept to linear colliders. We have also been studying optimization parameters, such as frequency, for the application of the RK-TBA concept to multi-TeV linear colliders. As an rf power source the RK-TBA scales favorably up to frequencies around 35 GHz. An overview of this work with details of the design and performance of the prototype injector, beam line, and diagnostics will be presented.
Date:
October 5, 1998
Creator:
Anderson, D. E.; Eylon, S.; Henestroza, E.; Houck, T. L.; Lidia, M.; Vanecek, D. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Results from the Microminiature Thermionic Converter Demonstration Testing Program
Research is in progress to develop microminiature thermionic converters (MTCS) with high energy conversion efficiencies and variable operating temperatures using semiconductor integrated circuit (IC) fabrication methods. The use of IC techniques allows the fabrication of MTCS with cathode to anode spacing of several microns or less and with anode and cathode materials that will have work fimctions ranging from 1 eV to 3 eV. The small cathode to anode spacing and variable electrode work functions should allow the conversion of heat energy to relatively large current densities (up to tens of Amps/cmz) at relatively high conversion efficiencies ( 15-25%).
Date:
October 5, 1998
Creator:
King, D.B.; Luke, J.R. & Wyant, F.J.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 18, Ed. 1 Monday, October 5, 1998
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 5, 1998
Creator:
Horn, Richard A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Television Satellite and Cable Retransmission of Broadcast Video Programming Under the Copyright Act’s Compulsory Licenses
This report reviews the history and background of the cable and television satellite licenses of the Copyright Act, reviews the Satellite Home Viewer Act of 1994, and notes recent developments, including: the 1997 satellite license rate adjustment; pending bills relating to the compulsory licenses; and the August 1997 report of the Copyright Office on these licenses.
Date:
October 5, 1998
Creator:
Schrader, Dorothy
Object Type:
Report
System:
The UNT Digital Library
Texas and the Texas Surgical Society
Presidential address given by William H. Turney before the Texas Surgical Society. In the speech, Turney discusses important "heroes" in Texas history, as well as his aspiration to be a hero of a surgeon.
Date:
October 5, 1998
Creator:
Turney, William H.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: LO98-090
Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification;Retirement overages for public safety dispatchers employed by the City of Denton.(RQ-956).
Date:
October 5, 1998
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
The Bastrop Advertiser (Bastrop, Tex.), Vol. 145, No. 55, Ed. 1 Saturday, September 5, 1998
Semi-weekly newspaper from Bastrop, Texas that includes local, state, and national news along with advertising.
Date:
September 5, 1998
Creator:
McAuley, Davis
Object Type:
Newspaper
System:
The Portal to Texas History