Partner
UNT Libraries Government Documents Department
456
Oklahoma Historical Society
82
UNT Libraries Special Collections
23
Sterling Municipal Library
10
National WASP WWII Museum
8
Carl Albert Congressional Research and Studies Center
7
Alvin Community College
5
UNT Music Library
5
Nellie Pederson Civic Library
4
Comanche Public Library
4
51 More
Collection
Office of Scientific & Technical Information Technical Reports
365
Texas Digital Newspaper Program
130
Government Accountability Office Reports
76
Oklahoma Digital Newspaper Program
62
Tocker Foundation Grant
62
Jim Argo Collection
29
Abilene Library Consortium
14
Altus Times-Democrat
10
The Baytown Sun
10
Chickasha Newspaper Collection
10
83 More
Country
States
Year
Month
Day
Language
Turner Falls
Photograph of a scene at Turner Falls.
Date:
June 29, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Turner Falls
Photograph of a scene at Turner Falls.
Date:
June 29, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Infinitely Large New Dimensions
We construct intersecting brane configurations in Anti-de-Sitter space localizing gravity to the intersection region, with any number n of extra dimensions. This allows us to construct two kinds of theories with infinitely large new dimensions, TeV scale quantum gravity and sub-millimeter deviations from Newton's Law. The effective 4D Planck scale M{sub Pl} is determined in terms of the fundamental Planck scale M{sub *} and the AdS radius of curvature L via the familiar relation M{sub Pl}{sup 2} {approx} M{sub *}{sup 2+n} L{sup n}; L acts as an effective radius of compactification for gravity on the intersection. Taking M{sub *} {approx} TeV and L {approx} sub-mm reproduces the phenomenology of theories with large extra dimensions. Alternately, taking M{sub *} {approx} L{sup -1} {approx} M{sub Pl}, and placing our 3-brane a distance {approx} 100M{sub Pl}{sup -1} away from the intersection gives us a theory with an exponential determination of the Weak/Planck hierarchy.
Date:
July 29, 1999
Creator:
Arkani-Hamed, Nima; Dimopoulos, Savas; Dvali, Gia & Kaloper, Nemanja
Object Type:
Article
System:
The UNT Digital Library
Federal Emergency Management Information System (FEMIS) System Administration Guide for FEMIS Version 1.4.6
The Federal Emergency Management Information System (FEMIS) is an emergency management planning and response tool that was developed by the Pacific Northwest National Laboratory (PNNL) under the direction of the U.S. Army Chemical Biological Defense Command. The FEMIS System Administration Guide provides information necessary for the system administrator to maintain the FEMIS system. The FEMIS system is designed for a single Chemical Stockpile Emergency Preparedness Program (CSEPP) site that has multiple Emergency Operations Centers (EOCs). Each EOC has personal computers (PCs) that emergency planners and operations personnel use to do their jobs. These PCs are corrected via a local area network (LAN) to servers that provide EOC-wide services. Each EOC is interconnected to other EOCs via a Wide Area Network (WAN). Thus, FEMIS is an integrated software product that resides on client/server computer architecture. The main body of FEMIS software, referred to as the FEMIS Application Software, resides on the PC client(s) and is directly accessible to emergency management personnel. The remainder of the FEMIS software, referred to as the FEMIS Support Software, resides on the UNIX server. The Support Software provides the communication data distribution and notification functionality necessary to operate FEMIS in a networked, client/server environment.
Date:
June 29, 1999
Creator:
Arp, J. A.; Bower, J. C.; Burnett, R. A.; Carter, R. J.; Downing, T. R.; Fangman, P. M. et al.
Object Type:
Report
System:
The UNT Digital Library
Federal Emergency Management Information System (FEMIS), Installation Guide for FEMIS 1.4.6
The Federal Emergency Management Information System (FEMIS) is an emergency management planning and response tool that was developed by the Pacific Northwest National Laboratory (PNNL) under the direction of the U.S. Army Chemical Biological Defense Command. The FEMIS System Administration Guide provides information necessary for the system administrator to maintain the FEMIS system. The FEMIS system is designed for a single Chemical Stockpile Emergency Preparedness Program (CSEPP) site that has multiple Emergency Operations Centers (EOCs). Each EOC has personal computers (PCs) that emergency planners and operations personnel use to do their jobs. These PCs are corrected via a local area network (LAN) to servers that provide EOC-wide services. Each EOC is interconnected to other EOCs via a Wide Area Network (WAN). Thus, FEMIS is an integrated software product that resides on client/server computer architecture. The main body of FEMIS software, referred to as the FEMIS Application Software, resides on the PC client(s) and is directly accessible to emergency management personnel. The remainder of the FEMIS software, referred to as the FEMIS Support Software, resides on the UNIX server. The Support Software provides the communication data distribution and notification functionality necessary to operate FEMIS in a networked, client/server environment.
Date:
June 29, 1999
Creator:
Arp, J. A.; Burnett, R. A.; Carter, R. J.; Downing, T. R.; Dunkle, J. R.; Fangman, P. M. et al.
Object Type:
Report
System:
The UNT Digital Library
Installation Guide for FEMIS v1.4.6
The FEMIS Installation Guide provides instructions for installing and configuring the FEMIS software package.
Date:
June 29, 1999
Creator:
Arp, Jonathan A.; Burnett, Robert A.; Carter, Richard J.; Downing, Timothy R.; Dunkle, Julie R.; Fangman, Patricia M. et al.
Object Type:
Report
System:
The UNT Digital Library
Reuse of concrete from contaminated structures
None
Date:
January 29, 1999
Creator:
Ayers, Kenneth W.; Parker, Frank L.; Abkowtiz, Mark D.; Cohen, Mark; Aghara, Sukesh K.; Boren, John K. et al.
Object Type:
Report
System:
The UNT Digital Library
241-Z-361 Sludge Characterization Sampling and Analysis Plan
This sampling and analysis plan (SAP) identifies the type, quantity, and quality of data needed to support characterization of the sludge that remains in Tank 241-2-361. The procedures described in this SAP are based on the results of the 241-2-361 Sludge Characterization Data Quality Objectives (DQO) (BWHC 1999) process for the tank. The primary objectives of this project are to evaluate the contents of Tank 241-2-361 in order to resolve safety and safeguards issues and to assess alternatives for sludge removal and disposal.
Date:
July 29, 1999
Creator:
BANNING, D.L.
Object Type:
Report
System:
The UNT Digital Library
Tank 241-TX-118 Final Report for Rotary Mode Core Samples [RMCS] 259 and 260 [SEC 1 THRU SEC 5]
None
Date:
November 29, 1999
Creator:
BELL, K.E.
Object Type:
Report
System:
The UNT Digital Library
AGE-RELATED DEGRADATION OF NUCLEAR POWER PLANT STRUCTURES AND COMPONENTS.
This paper summarizes and highlights the results of the initial phase of a research project on the assessment of aged and degraded structures and components important to the safe operation of nuclear power plants (NPPs). A review of age-related degradation of structures and passive components at NPPs was performed. Instances of age-related degradation have been collected and reviewed. Data were collected from plant generated documents such as Licensing Event Reports, NRC generic communications, NUREGs and industry reports. Applicable cases of degradation occurrences were reviewed and then entered into a computerized database. The results obtained from the review of degradation occurrences are summarized and discussed. Various trending analyses were performed to identify which structures and components are most affected, whether degradation occurrences are worsening, and what are the most common aging mechanisms. The paper also discusses potential aging issues and degradation-susceptible structures and passive components which would have the greatest impact on plant risk.
Date:
March 29, 1999
Creator:
BRAVERMAN,J.
Object Type:
Article
System:
The UNT Digital Library
Recent Progress in Emittance Control of the Photoelectron Beam Using Transverse Laser Shape Modulation and Tomography Technique.
A low emittance beam is very important for many applications, such as short-wavelength Free-Electron Lasers. A diagnostic that provides detailed information on the density distribution of the electron bunch in multi-dimensional phase-space is an essential tool for obtaining small emittance at a reasonable charge. Accurate phase space reconstruction and an analysis using a transport line with nine focusing magnets and techniques to control the optical functions and phases was demonstrated in previous publication. Relatively long time of measurements (approximately 30 minutes) was improved by installing Hall probes into each quadrupole magnet. This eliminated necessity to degauss all quadrupoles between each measurement points. Additional phase control of RF system and driving laser should also improve confidence in 5 dimensional phase space reconstruction.
Date:
March 29, 1999
Creator:
Babzien,M.; Ben-Zvi, Ilan; Malone,R.; Wang,X. J. & Yakimenko,V.
Object Type:
Article
System:
The UNT Digital Library
High-Density Plasma-Induced Etch Damage of GaN
Anisotropic, smooth etching of the group-III nitrides has been reported at relatively high rates in high-density plasma etch systems. However, such etch results are often obtained under high de-bias andlor high plasma flux conditions where plasma induced damage can be significant. Despite the fact that the group-III nitrides have higher bonding energies than more conventional III-V compounds, plasma-induced etch damage is still a concern. Attempts to minimize such damage by reducing the ion energy or increasing the chemical activity in the plasma often result in a loss of etch rate or anisotropy which significantly limits critical dimensions and reduces the utility of the process for device applications requiring vertical etch profiles. It is therefore necessary to develop plasma etch processes which couple anisotropy for critical dimension and sidewall profile control and high etch rates with low-damage for optimum device performance. In this study we report changes in sheet resistance and contact resistance for n- and p-type GaN samples exposed to an Ar inductively coupled plasma (ICP). In general, plasma-induced damage was more sensitive to ion bombardment energies as compared to plasma flux. In addition, p-GaN was typically more sensitive to plasma-induced damage as compared to n-GaN.
Date:
April 29, 1999
Creator:
Baca, A. G.; Han, J.; Lester, L. F.; Pearton, S. J.; Ren, F.; Shul, R. J. et al.
Object Type:
Article
System:
The UNT Digital Library
The dependence of HBT source parameters on beam energy and reaction plane at AGS.
Two-particle correlations between pions in Au+Au collisions have been measured at beam kinetic energies of 6, 8, and 10.6 GeV/u at the Alternating Gradient Synchrotron (AGS) over a wide range of rapidities using a magnetic spectrometer. The data have been analyzed in the Hanbury-Brown and Twiss (HBT) framework to extract source parameters as functions of the reaction plane as well as beam energy.
Date:
June 29, 1999
Creator:
Back, B. B.; Betts, R. R.; Chang, J.; Chang, W. C.; Chi, C. Y.; Collaboration, E917 et al.
Object Type:
Article
System:
The UNT Digital Library
Production of {phi} meson in Au+Au collisions at 11.7 A GeV/c.
First Measurement of {phi} meson production in Au+Au collisions has been conducted by E917 at BNL-AGS via selecting events with identified K{sup +}K{sup {minus}} pairs. Preliminary results on the invariant mass spectra of K{sup +}K{sup {minus}} pairs and the m{sub T} spectra are presented. Also, the inverse slope T, dN/dy, the ratio of {phi}/K{sup {minus}}, ratio of {phi}/K{sup +}K{sup {minus}} and their centrality dependences are extracted in a rapidity range of y = 0.9-1.4. Indications on the possible mechanisms of {phi} production are discussed.
Date:
June 29, 1999
Creator:
Back, B. B.; Betts, R. R.; Chang, J.; Chang, W. C.; Chi, C. Y.; Collaboration, E917 et al.
Object Type:
Article
System:
The UNT Digital Library
Spring magnet films.
The properties of exchange-spring-coupled bilayer and superlattice films are highlighted for Sm-Co hard magnet and Fe or Co soft magnet layers. The hexagonal Sm-Co is grown via magnetron sputtering in a- and b-axis epitaxial orientations. In both cases the c-axis, in the film plane, is the easy axis of magnetization. Trends in coercivity with film thickness are established and related to the respective microstructure of the two orientations. The magnetization reversal process for the bilayers is examined by magnetometry and magneto-optical imaging, as well as by simulations that utilize a one-dimensional model to provide the spin configuration for each atomic layer. The Fe magnetization is pinned to that of the Sm-Co at the interface, and reversal proceeds via a progressive twisting of the Fe magnetization. The Fe demagnetization curves are reversible as expected for a spring magnet. Comparison of experiment and simulations indicates that the spring magnet behavior can be understood from the intrinsic properties of the hard and soft layers. Estimated are made of the ultimate gain in performance that can potentially be realized in this system.
Date:
March 29, 1999
Creator:
Bader, S. D.; Fullerton, E. E.; Gornakov, V. S.; Inomata, A.; Jiang, J. S.; Nikitenko, V. I. et al.
Object Type:
Article
System:
The UNT Digital Library
A Finite Element Method for Free-Surface Flows of Incompressible Fluids in Three Dimensions, Part II: Dynamic Wetting Lines
To date, few researchers have solved three-dimensional free-surface problems with dynamic wetting lines. This paper extends the free-surface finite element method described in a companion paper [Cairncross, R.A., P.R. Schunk, T.A. Baer, P.A. Sackinger, R.R. Rao, "A finite element method for free surface flows of incompressible fluid in three dimensions, Part I: Boundary-Fitted mesh motion.", to be published (1998)] to handle dynamic wetting. A generalization of the technique used in two dimensional modeling to circumvent double-valued velocities at the wetting line, the so-called kinematic paradox, is presented for a wetting line in three dimensions. This approach requires the fluid velocity normal to the contact line to be zero, the fluid velocity tangent to the contact line to be equal to the tangential component of web velocity, and the fluid velocity into the web to be zero. In addition, slip is allowed in a narrow strip along the substrate surface near the dynamic contact line. For realistic wetting-line motion, a contact angle which varies with wetting speed is required because contact lines in three dimensions typically advance or recede a different rates depending upon location and/or have both advancing and receding portions. The theory is applied to capillary rise of static …
Date:
January 29, 1999
Creator:
Baer, T. A.; Cairncross, R. A.; Rao, R. R.; Sackinger, P. A. & Schunk, P. R.
Object Type:
Article
System:
The UNT Digital Library
Beam Manipulation With an RF Dipole.
Coherent betatron motion adiabatically excited by an RF dipole has been successfully employed to overcome strong intrinsic spin depolarization resonances in the AGS, while a solenoid partial snake has been used to correct imperfection spin resonances. The experimental results showed that a full spin flip was obtained in passing through an intrinsic spin resonance when all the beam particles were forced to oscillate coherently at a large amplitude without diluting the beam emittance. With this method, we have successfully accelerated polarized beam up to 23.5 GeV/c. A new type of second order spin resonances was also discovered. As a non-destructive manipulation, this method can also be used for nonlinear beam dynamics studies and beam diagnosis such as measuring phase advance and betatron amplitude function.
Date:
March 29, 1999
Creator:
Bai, M.
Object Type:
Article
System:
The UNT Digital Library
Adiabatic Excitation of Longitudinal Bunch Shape Oscillations.
By modulating the rf voltage at near twice the synchrotron frequency we are able to modulate the longitudinal bunch shape. We show experimentally that this can be done while preserving the longitudinal emittance when the rf voltage modulation is turned on adiabatically. Experimental measurements will be presented along with theoretical predictions.
Date:
March 29, 1999
Creator:
Bai, M.; Brown, K.; Fischer, W.; Roser, T.; Smith, K.; Tsoupas, N. et al.
Object Type:
Article
System:
The UNT Digital Library
The laser interferometer system for the large optics diamond turning machine
The purpose of this report is to describe the Laser Interferometer System designed for the Large Optics Diamond Turning Machine (LODTM). To better understand the laser interferometer system, it is useful to begin with an overview of the LODTM metrology system.
Date:
June 29, 1999
Creator:
Baird, E D; Donaldson, R R & Patterson, S R
Object Type:
Report
System:
The UNT Digital Library
Advanced Eddy current NDE steam generator tubing.
As part of a multifaceted project on steam generator integrity funded by the U.S. Nuclear Regulatory Commission, Argonne National Laboratory is carrying out research on the reliability of nondestructive evaluation (NDE). A particular area of interest is the impact of advanced eddy current (EC) NDE technology. This paper presents an overview of work that supports this effort in the areas of numerical electromagnetic (EM) modeling, data analysis, signal processing, and visualization of EC inspection results. Finite-element modeling has been utilized to study conventional and emerging EC probe designs. This research is aimed at determining probe responses to flaw morphologies of current interest. Application of signal processing and automated data analysis algorithms has also been addressed. Efforts have focused on assessment of frequency and spatial domain filters and implementation of more effective data analysis and display methods. Data analysis studies have dealt with implementation of linear and nonlinear multivariate models to relate EC inspection parameters to steam generator tubing defect size and structural integrity. Various signal enhancement and visualization schemes are also being evaluated and will serve as integral parts of computer-aided data analysis algorithms. Results from this research will ultimately be substantiated through testing on laboratory-grown and in-service-degraded tubes.
Date:
March 29, 1999
Creator:
Bakhtiari, S.
Object Type:
Article
System:
The UNT Digital Library
EXPERIMENTAL RESULTS FROM A MICROWAVE CAVITY BEAM POSITION MONITOR.
Future Linear Colliders have hard requirements for the beam transverse position stability in the accelerator. A beam Position Monitor (BPM) with the resolution better than 0.1 micron in the single bunch regime is needed to control the stability of the beam position along the linac. Proposed BPM is based on the measurement of the asymmetrical mode excited by single bunch in the cavity. Four stages of signal processing (space-, time-, frequency- and phase-filtering providing the required signal-to-noise ratio) are used to obtain extremely high resolution. The measurement set-up was designed by BINP and installed at ATF/BNL to test experimentally this concept. The set-up includes three two-coordinates BPM's at the frequency of 13.566 GHz, and reference intensity/phase cavity. BPM's were mounted on support table. The two-coordinates movers allow to move and align BPM's along the straight line, using the signals from the beam. The position of each monitor is controlled by the sensors with the accuracy 0.03 micron. The information from three monitors allows to exclude angle and position jitter of the beam and measure BPM resolution. In the experiments the resolution of about 0.15 micron for 0.25 nC beam intensity was obtained, that is close to the value required.
Date:
March 29, 1999
Creator:
Balakin, V.; Bazhan, A.; Lunev, P.; Solyak, N.; Vogel, V.; Zhogolev, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Biomass Crop Production: Benefits for Soil Quality and Carbon Sequestration
Research at three locations in the southeastern US is quantifying changes in soil quality and soil carbon storage that occur during production of biomass crops compared with row crops. After three growing seasons, soil quality improved and soil carbon storage increased on plots planted to cottonwood, sycamore, sweetgum with a cover crop, switchgrass, and no-till corn. For tree crops, sequestered belowground carbon was found mainly in stumps and large roots. At the TN site, the coarse woody organic matter storage belowground was 1.3 Mg ha{sup {minus}1}yr{sup {minus}1}, of which 79% was stumps and large roots and 21% fine roots. Switchgrass at the AL site also stored considerable carbon belowground as coarse roots. Most of the carbon storage occurred mainly in the upper 30 cw although coarse roots were found to depths of greater than 60 cm. Biomass crops contributed to improvements in soil physical quality as well as increasing belowground carbon sequestration. The distribution and extent of carbon sequestration depends on the growth characteristics and age of the individual biomass crop species. Time and increasing crop maturity will determine the potential of these biomass crops to significantly contribute to the overall national goal of increasing carbon sequestration and reducing greenhouse …
Date:
August 29, 1999
Creator:
Bandaranayake, W.; Bock, B. R.; Houston, A.; Joslin, J. D.; Pettry, D. E.; Schoenholtz, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Human speech articulator measurements using low power, 2GHz Homodyne sensors
Very low power, short-range microwave ''radar-like'' sensors can measure the motions and vibrations of internal human speech articulators as speech is produced. In these animate (and also in inanimate acoustic systems) microwave sensors can measure vibration information associated with excitation sources and other interfaces. These data, together with the corresponding acoustic data, enable the calculation of system transfer functions. This information appears to be useful for a surprisingly wide range of applications such as speech coding and recognition, speaker or object identification, speech and musical instrument synthesis, noise cancellation, and other applications.
Date:
June 29, 1999
Creator:
Barnes, T; Burnett, G C & Holzrichter, J F
Object Type:
Article
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 41, No. 17, Ed. 1 Thursday, April 29, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 29, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History