Partner
UNT Libraries Government Documents Department
811
UNT Libraries Special Collections
208
Oklahoma Historical Society
184
Texas Historical Commission
32
Sterling Municipal Library
24
UNT Music Library
20
Carl Albert Congressional Research and Studies Center
19
UNT Libraries
15
Rice University Woodson Research Center
14
Alvin Community College
13
70 More
Collection
Office of Scientific & Technical Information Technical Reports
743
Texas Digital Newspaper Program
307
Oklahoma Digital Newspaper Program
167
KXAS-NBC 5 News Collection
147
Tocker Foundation Grant
137
Chickasha Newspaper Collection
44
Jim Argo Collection
37
LGBT Collections
33
THC National Register Collection
32
Texas State Publications
26
126 More
Degree Department
Country
Year
Month
Results:
1 - 24 of
1,619
next
5 MeV Mott polarimeter for rapid precise electron beam polarization measurements
Low energy (E{sub k} = 100 keV) Mott scattering polarimeters are ill-suited to support operations foreseen for the polarized electron injector at Jefferson Lab. One solution is to measure the polarization at 5 MeV where multiple and plural scattering are unimportant and precision beam monitoring is straightforward. The higher injector beam current offsets the lower cross-sections; measured rates scale to 1 kHz/{mu}A with a 1 {mu}m thick gold target foil.
Date:
November 1, 1997
Creator:
Price, J. S.; Poelker, B. M. & Sinclair, C. K.
Object Type:
Report
System:
The UNT Digital Library
The 16 August 1997 Novaya Zemlya seismic event as viewed from GSN stations KEV and KBS
Using current and historic seismic records from Global Seismic Network stations KEV and KBS, the authors find that S minus P arrival time comparisons between nuclear explosions and the 16 August 1997 seismic event (m{sub b} {approx} 3.6) from near Novaya Zemlya clearly indicate that (relative to KEV) the 16 August event occurred at least 80 km east of the Russian test site. Including S minus P arrival times from KBS constrains the location to beneath the Kara Sea and in good agreement with previously reported locations, over 100 km southeast of the test site. From an analysis of P{sub n}/S{sub n} waveform ratios at frequencies above 4 Hz, they find that the 16 August event falls within the population of regional earthquakes and is distinctly separated from Novaya Zemlya and other northern Eurasian nuclear explosion populations. Thus, given its location and waveform characteristics, they conclude the 16 August event was an earthquake. The 16 August event was not detected at teleseismic distances, and thus, this event provides a good example of the regional detection, location, and identification efforts that will be required to monitor the Comprehensive Test Ban Treaty below m{sub b} {approx} 4.
Date:
November 1, 1997
Creator:
Hartse, H.E.
Object Type:
Report
System:
The UNT Digital Library
1996 annual report on low-level radioactive waste management progress. Report to Congress
This report is prepared in response to the Low-Level Radioactive Waste Policy Act (the Act), Public Law 96-573, 1980, as amended by the Low-Level Radioactive Waste Policy Amendments Act of 1985, Public Law 99-240. The report summarizes the activities during calendar year 1996 related to the establishment of new disposal facilities for commercially-generated low-level radioactive waste. The report emphasizes significant issues and events that have affected progress in developing new disposal facilities, and also includes an introduction that provides background information and perspective on US policy for low-level radioactive waste disposal.
Date:
November 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1997 Monitoring report for the Gunnison, Colorado Wetlands Mitigation Plan
Under the Uranium Mill Tailings Remedial Action (UMTRA) Project, the U.S. Department of Energy (DOE) cleaned up uranium mill tailings and other surface contamination near the town of Gunnison, Colorado. Remedial action resulted in the elimination of 4.3 acres (ac) (1.7 hectares [ha]) of wetlands. This loss is mitigated by the enhancement of six spring-fed areas on Bureau of Land Management (BLM) land (mitigation sites). Approximately 254 ac (1 03.3 ha) were fenced at the six sites to exclude grazing livestock. Of the 254 ac (103.3 ha), 17.8 ac (7.2 ha) are riparian plant communities; the rest are sagebrush communities. Baseline grazed conditions of the riparian plant communities at the mitigation sites were measured prior to fencing. This report discusses results of the fourth year of a monitoring program implemented to document the response of vegetation and wildlife to the exclusion of livestock. Three criteria for determining success of the mitigation were established: plant height, vegetation density (bare ground), and vegetation diversity. By 1996, Prospector Spring, Upper Long`s Gulch, and Camp Kettle met the criteria. The DOE requested transfer of these sites to BLM for long-term oversight. The 1997 evaluation of the three remaining sites, discussed in this report, showed …
Date:
November 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
31305: Tevatron searches for compositeness
Tevatron experiments have recently set or improved limits on quark and lepton compositeness. Included here are results from {radical}s = 1.8 TeV p{anti p} collider experiments D0 and CDF and from fixed target neutrino experiment CCFR, who report limits on quark-quark, quark-lepton, and quark-neutrino compositeness, respectively.
Date:
November 1, 1997
Creator:
Gallas, E. & Collaborations, E740 and E741
Object Type:
Article
System:
The UNT Digital Library
7th International Workshop on the Identification of Transcribed Sequences: Beyond the Identification of Transcribed Sequences. Program
None
Date:
November 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Abilene Philharmonic Playbill: November 15-December 14, 1997
Program for Abilene Philharmonic concerts performed on November 15th (third concert, classical) and December 13-14th (fourth concert, pops) during the 48th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
November 1997
Creator:
Abilene Philharmonic
Object Type:
Book
System:
The Portal to Texas History
Accelerator production of tritium plant design and supporting engineering development and demonstration work
Tritium is an isotope of hydrogen with a half life of 12.3 years. Because it is essential for US thermonuclear weapons to function, tritium must be periodically replenished. Since K reactor at Savannah River Site stopped operating in 1988, tritium has been recycled from dismantled nuclear weapons. This process is possible only as long as many weapons are being retired. Maintaining the stockpile at the level called for in the present Strategic Arms Reduction Treaty (START-I) will require the Department of Energy to have an operational tritium production capability in the 2005--2007 time frame. To make the required amount of tritium using an accelerator based system (APT), neutrons will be produced through high energy proton reactions with tungsten and lead. Those neutrons will be moderated and captured in {sup 3}He to make tritium. The APT plant design will use a 1,700 MeV linear accelerator operated at 100 mA. In preparation for engineering design, starting in October 1997 and subsequent construction, a program of engineering development and demonstration is underway. That work includes assembly and testing of the first 20 MeV of the low energy plant linac at 100 mA, high-energy linac accelerating structure prototyping, radiofrequency power system improvements, neutronic efficiency …
Date:
November 1, 1997
Creator:
Lisowski, Paul W.
Object Type:
Article
System:
The UNT Digital Library
Accuracy analysis of the phase-screen propagator: implications for modeling and migration
We present formal and numerical error analyses of the phase-screen (or split-step Fourier) propagator. Numerical results suggest that the propagator is accurate up to 60 degrees of propagation angle relative the main propagation direction for media with small velocity perturbations. We investigate the errors from various approaches for splitting the exponential operator of the phase-screen propagator. The symmetrically split equations are slightly more accurate than the one-step split equations. Numerical examples show that the differences among splitting approaches are not significant. Therefore. relative to the symmetrically split equations. the one-step-free one-step-perturbation split equation is more efficient for migration in which wavefields in the space domain at all depth levels must be calculated. However. the half-step-free one-step-perturbation half-step-free split equation has almost the same efficiency as the one-step split equations for forward wave simulations.
Date:
November 1, 1997
Creator:
Huang, Lian-Jie & Fehler, M. C.
Object Type:
Article
System:
The UNT Digital Library
Active Sites Environmental Monitoring Program FY 1996 annual report
This report summarizes the activities of the Active Sites Environmental Monitoring Program (ASEMP) from October 1995 through September 1996. The Radioactive Solid Waste Operations Group (RSWOG) of the Waste Management and Remedial Action Division (WMRAD) and the Environmental Sciences Division (ESD) at Oak Ridge National Laboratory (ORNL) established ASEMP in 1989. The purpose of the program is to provide early detection and performance monitoring at active low-level waste (LLW) disposal sites in Solid Waste Storage Area (SWSA) 6 and transuranic (TRU) waste storage sites in SWSA 5 North as required by Chapters 2 and 3 of US Department of Energy Order 5820.2A.
Date:
November 1, 1997
Creator:
Morrissey, C.M.; Marshall, D.S. & Cunningham, G.R.
Object Type:
Report
System:
The UNT Digital Library
Adding value to coal as feedstock for a hydrogen plant
Coal is the largest fossil energy resource and, in spite of its 19th century image, coal has proven itself in the last quarter of the 20th century as a modern and remarkably cost-effective fuel for generating electric power. Today, with increasing concern over greenhouse gases, coal needs to overcome the obstacle of being the most carbon intensive energy source there is. To clear this hurdle and provide a modern and environmentally viable energy resource based on abundant coal reserves is the goal of Vision 21. The strategy of Vision 21 rests on the production of high quality gaseous fuels like hydrogen that could either leave the plant or be used in the production of electricity by highly efficient fuel cell stacks. Here the authors outline three processing steps, that combined or separately can greatly reduce greenhouse gas emissions from coal. First, they propose to perform the gasification and water-gas shift reaction for producing hydrogen from coal with calcium oxide as a getter for carbon dioxide. This provides an efficient means to collect the carbon dioxide for reuse or disposal. Simultaneously, the carbonation facilitates the formation of hydrogen and provides the energy necessary to drive the hydrogen producing reaction to completion. …
Date:
November 1, 1997
Creator:
Lackner, K.; Butt, D.; Jensen, R. & Ziock, H.
Object Type:
Report
System:
The UNT Digital Library
Advanced capabilities for future light sources
Methods to extend the capabilities beyond those available from the current generation synchrotron radiation sources based on undulators in electron storage rings are discussed. Taking advantage of the radiation-particle interaction and/or the availability of high power, ultrashort, optical lasers, it is possible to develop sources with higher brightness, smaller temporal resolution, or higher photon energy.
Date:
November 1, 1997
Creator:
Kim, K. J.
Object Type:
Article
System:
The UNT Digital Library
Advanced glass industries. Quarterly progress report, June 20, 1997--September 20, 1997
Projected timeline for projection completion appears to be correct in spite of delay in receiving government funds. Design iterations for rotary prototype furnaces are already beginning. Areas of concern regarding testing equipment and techniques must be addressed. This report address the following aspect of rotary furnaces: materials testing; prototype development; testing protocols and methods; and technical milestones.
Date:
November 1, 1997
Creator:
Pochan, D.
Object Type:
Report
System:
The UNT Digital Library
Advanced polymer chemistry of organometallic anions
This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective of the project was to prepare and characterize new polymers incorporating cobalt dicarbollide. Specific goals were to prepare polymerizable cobalt dicarbollide monomers using the nucleophilic substitution route discovered in laboratories and to establish the reaction conditions required to form polymers from these complexes. This one-year project resulted in two publications (in press), and provided the foundation for further investigations into polymer synthesis and characterization using cobalt dicarbollide and other metallocarboranes. Interest in synthesizing organometallic polymers containing the cobalt bis(dicarbollide) anion is motivated by their possible application as cation exchange materials for the remediation of cesium-137 and strontium-90 from nuclear wastes.
Date:
November 1, 1997
Creator:
Chamberlin, R. M.; Abney, K. D.; Balaich, G. J. & Fino, S. A.
Object Type:
Report
System:
The UNT Digital Library
Adventures in supercomputing: Scientific exploration in an era of change
Students deserve the opportunity to explore the world of science surrounding them. Therefore it is important that scientific exploration and investigation be a part of each student`s educational career. The Department of Energy`s Adventures in Superconducting (AiS) takes students beyond mere scientific literacy to a rich embodiment of scientific exploration. AiS provides today`s science and math students with a greater opportunity to investigate science problems, propose solutions, explore different methods of solving the problem, organize their work into a technical paper, and present their results. Students learn at different rates in different ways. Science classes with students having varying learning styles and levels of achievement have always been a challenge for teachers. The AiS {open_quotes}hands-on, minds-on{close_quotes} project-based method of teaching science meets the challenge of this diversity heads on! AiS uses the development of student chosen projects as the means of achieving a lifelong enthusiasm for scientific proficiency. One goal of AiS is to emulate the research that takes place in the everyday environment of scientists. Students work in teams and often collaborate with students nationwide. With the help of mentors from the academic and scientific community, students pose a problem in science, investigate possible solutions, design a mathematical and …
Date:
November 1, 1997
Creator:
Gentry, E.; Helland, B. & Summers, B.
Object Type:
Article
System:
The UNT Digital Library
[African Awakening '97]
Program for the annual African Awakening Conference hosted by the Junior Black Academy of Arts and Letters on November 1-2, 1997.
Date:
November 1997
Creator:
Junior Black Academy of Arts and Letters
Object Type:
Pamphlet
System:
The UNT Digital Library
The Age, Volume 21, Number 11, November 1997
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
November 1997
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Air quality effects of alternative fuels. Final report
To support the Alternative Fuels Utilization Program, a comparison of potential air quality effects of alternative transportation fuels is being performed. This report presents the results of Phase 1 of this program, focusing on reformulated gasoline (RFG), methanol blended with 15 percent gasoline (M85), and compressed natural gas (CNG). The fuels are compared in terms of effects on simulated future concentrations of ozone and mobile source air toxics in a photochemical grid model. The fuel comparisons were carried out for the future year 2020 and assumed complete replacement of gasoline in the projected light-duty gasoline fleet by each of the candidate fuels. The model simulations were carried out for the areas surrounding Los Angeles and Baltimore/DC, and other (non-mobile) sources of atmospheric emissions were projected according to published estimates of economic and population growth, and planned emission control measures specific to each modeling domain. The future-year results are compared to a future-year run with all gasoline vehicle emissions removed. The results of the comparison indicate that the use of M85 is likely to produce similar ozone and air toxics levels as those projected from the use of RFG. Substitution of CNG is projected to produce significantly lower levels of ozone …
Date:
November 1, 1997
Creator:
Guthrie, P.; Ligocki, M.; Looker, R. & Cohen, J.
Object Type:
Report
System:
The UNT Digital Library
Algorithms using inter-band cross-correlation for pixel registration and jitter reconstruction in multi-channel push-broom imagers
We present two algorithms for determining sensor motion of a multi-spectral push-broom imager for use in subsequent image registration. The first algorithm, termed the {open_quotes}pairwise{close_quotes} method, performs cross-correlations between individual pairs of channels. The offsets of maximum correlation are formulated into a system of linear equations whose solution gives an estimate of the jitter function. The second algorithm performs cross-correlations between channels and a reference image called the {open_quotes}baseline{close_quotes} which is constructed by averaging together all the channels in the image cube. An estimated jitter time series is computed for each channel, all of which are overlapped and averaged to obtain a best estimate of the jitter function. The pairwise method is more general in that it can handle a wider range of jitter scenarios. The baseline method, although more restricted, is very simple to implement, and its accuracy can be improved substantially through iteration. In this paper, we describe both methods in detail and present results of simulations performed on thermal-infrared data cubes.
Date:
November 1, 1997
Creator:
Theiler, J.; Henderson, B.G. & Smith, B.W.
Object Type:
Article
System:
The UNT Digital Library
Alpha-like calculations with MCNP
Alpha (time-absorption eigenvalue) calculations are not an explicit calculational option in MCNP. Nevertheless, it is possible to perform alpha calculations with MCNP. Such calculations are presently either very inefficient or require special coding or cross section library modifications. However, alpha-like calculations can easily be performed with MCNP using the KCODE option with neutron energy- or time-cutoffs. These approximate alpha-like calculations are described and tested.
Date:
November 1, 1997
Creator:
Parsons, D.K.
Object Type:
Article
System:
The UNT Digital Library
Amorphous silicon research. Phase III technical progress report, August 1, 1996--July 31, 1997
The principal objective of this R&D program is to expand, enhance and accelerate knowledge and capabilities for the development of high-performance, two-terminal multijunction hydrogenated amorphous silicon (a-Si) alloy cells and modules. The near-term goal of the program is to achieve 12% stable active-area efficiency using the multijunction approach. The long-term goal is to achieve 15% stable efficiency multijunction modules. The major effort of this program is to develop high efficiency component cells and incorporate them in the triple-junction structure to obtain the highest stable efficiency. New and improved deposition regimes were investigated to obtain better cell performance. Fundamental studies to obtain better understanding of material and cell performance were undertaken.
Date:
November 1, 1997
Creator:
Guha, S.
Object Type:
Report
System:
The UNT Digital Library
AMR++: A design for parallel object-oriented adaptive mesh refinement
Adaptive mesh refinement computations are complicated by their dynamic nature. In the serial environment they require substantial infrastructures to support the regridding processes, intergrid operations, and local bookkeeping of positions of grids relative to one another. In the parallel environment the dynamic behavior is more problematic because it requires dynamic distribution support and load balancing. Parallel AMR is further complicated by the substantial task parallelism, in addition to the obvious data parallelism, this task parallelism requires additional infrastructure to support efficiently. The degree of parallelism is typically dependent upon the algorithms in use and the equations being solved. Different algorithms have significant compromises between computation and communication. Substantial research work is often required to define efficient methods and suitable infrastructure. The purpose of this paper is to introduce AMR++ as an object-oriented library which forms a part of the OVERTURE framework, a much larger object-oriented numerical framework developed and supported at Los Alamos National Laboratory and distributed on the Web for the last several years.
Date:
November 1, 1997
Creator:
Quinlan, D.
Object Type:
Article
System:
The UNT Digital Library
Analysis and testing of the DIII-D ohmic heating coil lead repair clamp
DIII-D has been operating for the last year with limited volt-second capabilities due to structural failure of a conductor lead to one of the ohmic heating (OH) solenoids. The conductor failure was due to poor epoxy impregnation of the overwrap of the lead pack, resulting in copper fatigue and a water leak. A number of structural analyses were performed to assist in determining the failure scenario and to evaluate various repair options. A fatigue stress analysis of the leads with a failed epoxy overwrap indicated crack initiation after 1,000 cycles at the maximum operating conditions. The failure occurred in a very inaccessible area which restricted design repair options to concepts which could be implemented remotely. Several design options were considered for repairing the lead so that it can sustain the loads for 7.5 Vs conditions at full toroidal field. A clamp, along with preloaded banding straps and shim bags, provides a system that guarantees that the stress at the crack location is always compressive and prevents further crack growth in the conductor. Due to the limited space available for the repair, it was necessary to design the clamp system to operate at the material yield stress. The primary components of …
Date:
November 1, 1997
Creator:
Reis, E. E.; Anderson, P. M.; Chin, E. & Robinson, J. I.
Object Type:
Article
System:
The UNT Digital Library
Analysis of cascade impactor and EPA method 29 data from the americium/curium pilot melter system
The offgas system of the Am/Cm pilot melter at TNX was characterized by measuring the particulate evolution using a cascade impactor and EPA Method 29. This sampling work was performed by John Harden of the Clemson Environmental Technologies Laboratory, under SCUREF Task SC0056. Elemental analyses were performed by the SRTC Mobile Laboratory.Operation of the Am/Cm melter with B2000 frit has resulted in deposition of PbO and boron compounds in the offgas system that has contributed to pluggage of the High Efficiency Mist Eliminator (HEME). Sampling of the offgas system was performed to quantify the amount of particulate in the offgas system under several sets of conditions. Particulate concentration and particle size distribution were measured just downstream of the melter pressure control air addition port and at the HEME inlet. At both locations, the particulate was measured with and without steam to the film cooler while the melter was idled at about 1450 degrees Celsius. Additional determinations were made at the melter location during feeding and during idling at 1150 degrees Celsius rather than 1450 degrees Celsius (both with no steam to the film cooler). Deposition of particulates upstream of the melter sample point may have, and most likely did occur …
Date:
November 1, 1997
Creator:
Zamecnik, J. R.
Object Type:
Report
System:
The UNT Digital Library