Collection
Office of Scientific & Technical Information Technical Reports
14,165
Texas State Publications
460
Texas Attorney General Opinions
203
Texas Register
112
USGS Topographic Map Collection
106
Congressional Research Service Reports
67
Technical Report Archive and Image Library
64
Office of Technology Assessment
63
Federal Communications Commission Record
27
Advisory Commission on Intergovernmental Relations
13
9 More
Serial/Series Title
Texas Register
112
7.5 Minute Series (Topographic)
59
Texas Motor Vehicle Traffic Accident Summaries
55
30 x 60 Minute Series (Topographic)
44
Texas Parks & Wildlife News
42
Argonne National Laboratory Reports
34
FCC Record
27
Texas Disease Prevention News
24
Fiscal Year 1993
23
73rd Legislature of Texas
18
220 More
Country
States
Year
Month
Language
15,324 Matching Results
Results open in a new window/tab.
Annual Report to the Congress, Fiscal Year 1992
Annual report of the progress and budget of the Office of Technology Assessment. 20th Anniversary Edition.
Date:
January 1993
Creator:
Office of Technology Assessment
Object Type:
Text
System:
The UNT Digital Library
[Anomalous ion transport and feedback control]
The slab branch of the ITG mode was produced by a d.c. ion acceleration heating scheme and definitively identified in CLM under the previous DOE grant. A transit-time rf heating scheme was used to produce a more Maxwellian ion population to produce and identify a more predictable slab ITG mode. These experiments are partly based on some theoretical work on the substantial effects of anisotropy in [eta][sub i] on the slab mode. The progress under the present DOE grant are described below.
Date:
January 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Anti-gravity: The key to 21st century physics
The masses coupling constants and cosmological parameters obtained using our discrete and combinatorial physics based on discrimination between bit-strings indicate that we can achieve the unification of quantum mechanics with relativity which had become the goal of twentieth century physics. To broaden our case we show that limitations on measurement of the position and velocity of an individual massive particle observed in a colliding beam scattering experiment imply real, rational commutation relations between position and velocity. Prior to this limit being pushed down to quantum effects, the lower bound is set by the available technology, but is otherwise scale invariant. Replacing force by force per unit mass and force per unit charge allows us to take over the Feynman-Dyson proof of the Maxwell Equations and extend it to weak gravity. The crossing symmetry of the individual scattering processes when one or more particles are replaced by anti-particles predicts both Coulomb attraction (for charged particles) and a Newtonian repulsion between any particle and its anti-particle. Previous quantum results remain intact, and predict the expected relativistic fine structure and spin dependencies. Experimental confirmation of this anti-gravity prediction would inaugurate the physics of the twenty-first century.
Date:
January 1, 1993
Creator:
Noyes, H. Pierre
Object Type:
Article
System:
The UNT Digital Library
Anti-gravity: The key to 21st century physics
The masses coupling constants and cosmological parameters obtained using our discrete and combinatorial physics based on discrimination between bit-strings indicate that we can achieve the unification of quantum mechanics with relativity which had become the goal of twentieth century physics. To broaden our case we show that limitations on measurement of the position and velocity of an individual massive particle observed in a colliding beam scattering experiment imply real, rational commutation relations between position and velocity. Prior to this limit being pushed down to quantum effects, the lower bound is set by the available technology, but is otherwise scale invariant. Replacing force by force per unit mass and force per unit charge allows us to take over the Feynman-Dyson proof of the Maxwell Equations and extend it to weak gravity. The crossing symmetry of the individual scattering processes when one or more particles are replaced by anti-particles predicts both Coulomb attraction (for charged particles) and a Newtonian repulsion between any particle and its anti-particle. Previous quantum results remain intact, and predict the expected relativistic fine structure and spin dependencies. Experimental confirmation of this anti-gravity prediction would inaugurate the physics of the twenty-first century.
Date:
January 1, 1993
Creator:
Noyes, H. P.
Object Type:
Article
System:
The UNT Digital Library
Antiproton Extraction in the Fermilab Antiproton Accumulator
The RF and other manipulations required to extract antiprotons from the Accumulator core for Collider operation are described. ESME simulations of the motion in longitudinal phase space are shown. Measurements of the emittances of the extracted antiprotons are presented. The effect of the unstacking process on the core longitudinal and transverse emittances is examined and recent performance is also presented.
Date:
January 1, 1993
Creator:
Church, Mike & O'Day, Stephan
Object Type:
Report
System:
The UNT Digital Library
Apical Cu-O bond in YBa[sub 2]Cu[sub 3]O[sub 7-[delta]] superconductors by XAFS
Careful Cu K-edge X-ray absorption fine structure (XAFS) measurements on oriented powders of YBa[sub 2]CU[sub 3]O[sub 7[minus]] were made as a function of temperature, of [delta], [Tc] method of preparation and grain size. The XAFS data were analyzed for the Cu(1) - O(4) apical bond distance distribution. AU samples indicated evidence for a double-peak in the distribution with a splitting of 0.1[Angstrom], with the clearest case for the [delta] [approx] 0 samples occurring for the [Tc] = 89K 20[mu]m grain samples and the least clear one for the 5[mu]m grain [Tc] = 93K sample. There is no significant temperature dependence of the splitting. Because the XAFS evidence for the splitting depends on a small signal, it is prudent to verify its existence by other independent measurements.
Date:
January 1, 1993
Creator:
Stern, E. A.; Qian, M. (Washington Univ., Seattle, WA (United States). Dept. of Physics); Yacoby, Y. (Hebrew Univ., Jerusalem (Israel). Racah Inst. of Physics); Heald, S. M. (Brookhaven National Lab., Upton, NY (United States)) & Maeda, H. (Okayama Univ. (Japan). Dept. of Chemistry)
Object Type:
Article
System:
The UNT Digital Library
Apparatus for detecting the presence of a liquid
This invention is comprised of an apparatus for detecting the presence of a liquid in a region, including an electrically passive sensor adapted for contacting the liquid, and an electrically active detector. The sensor is a circuit with a pair of spaced-apart terminals connected to a switch that closes in the presence of the liquid. The detector carries an alternating current with a resonant frequency. When the sensor is placed in a region and liquid is present, the circuit of the sensor is closed. By bringing the detector close to the sensor, an alternating current is induced in the sensor that will, in turn, alter the resonant frequency of the detector. This change is signaled by a transducer. The switch can operate by a change in conductivity of a material between the terminals of the sensor or by expansion of a liquid absorber that pushes the two terminals together, or by a change in the conductivity of the space between the terminals as a result of the liquid. The detector generates an audible or visible signal, or both, in response to the current change.
Date:
January 1, 1993
Creator:
Kronberg, James W.
Object Type:
Patent
System:
The UNT Digital Library
Application of a simple analytical model to estimate effectiveness of radiation shielding for neutrons
Neutron dose equivalent rates have been measured for 800-MeV proton beam spills at the Los Alamos Meson Physics Facility. Neutron detectors were used to measure the neutron dose levels at a number of locations for each beam-spill test, and neutron energy spectra were measured for several beam-spill tests. Estimates of expected levels for various detector locations were made using a simple analytical model developed for 800-MeV proton beam spills. A comparison of measurements and model estimates indicates that the model is reasonably accurate in estimating the neutron dose equivalent rate for simple shielding geometries. The model fails for more complicated shielding geometries, where indirect contributions to the dose equivalent rate can dominate.
Date:
January 1, 1993
Creator:
Frankle, S. C.; Fitzgerald, D. H.; Hutson, R. L.; Macek, R. J. & Wilkinson, C. A.
Object Type:
Article
System:
The UNT Digital Library
Application of a simple parameter estimation method to predict effluent transport in the Savannah River
A simple parameter estimation method has been developed to determine the dispersion and velocity parameters associated with stream/river transport. The unsteady one dimensional Burgers' equation was chosen as the model equation, and the method has been applied to recent Savannah River dye tracer studies. The computed Savannah River transport coefficients compare favorably with documented values, and the time/concentration curves calculated from these coefficients compare well with the actual tracer data. The coefficients were used as a predictive capability and applied to Savannah River tritium concentration data obtained during the December 1991 accidental tritium discharge from the Savannah River Site. The peak tritium concentration at the intersection of Highway 301 and the Savannah River was underpredicted by only 5% using the coefficients computed from the dye data.
Date:
January 1, 1993
Creator:
Hensel, S.J. & Hayes, D.W.
Object Type:
Article
System:
The UNT Digital Library
Application of an advanced atmospheric mesoscale model to dispersion in the Rocky Flats, Colorado vicinity
Atmospheric Studies in Complex Terrain (ASCOT) program sponsored a field experiment in the winter of 1991 near Rocky Flats, Colorado. Both meteorological and tracer dispersion measurements were taken. These two data sets provided an opportunity to investigate the influence of terrain-generated, radiatively-driven flows on the dispersion of the tracer. We use the Regional Atmospheric Modeling System (RAMS), originally developed at Colorado State University, to simulate meteorological conditions and tracer dispersion on the case night of 4-5 February 1991. The simulations described herein reveal considerable information about the extent to which the Rocky Mountains influence the flow along the Front Range , the importance of diffusion when simulating drainage flows and the computing needs of simulations in complex terrain regions.
Date:
January 1, 1993
Creator:
Poulos, Gregory S. & Bossert, James E.
Object Type:
Article
System:
The UNT Digital Library
Application of geographic information systems to waste minimization efforts at Los Alamos National Laboratory
At Los Alamos National Laboratory (LANL), facility waste streams tend to be small but highly diverse. Initial characterization of such waste streams is often difficult in part due to a lack of tools to assist the generators themselves in completing such assessments. A methodology has been developed at LANL to allow process knowledgeable field personnel to develop baseline waste generation assessments and to evaluate potential waste minimization technology. This Process Waste Assessment (PWA) system is an application constructed within the Process Modeling System and currently being integrated with the InFoCAD Geographic Information System (GIS) . The Process Modeling System (PMS) is an object-oriented, mass balance-based, discrete-event simulation framework written using the Common Lisp Object System (CLOS) . Analytical capabilities supported within the PWA system include: complete mass balance specifications, historical characterization of selected waste streams and generation of facility profiles for materials consumption, resource utilization and worker exposure. Development activities include integration with the LANL facilities management Geographic Information System (GIS) and provisions for a Best Available Technologies (BAT) database. The environments used to develop these assessment tools will be discussed in addition to a review of initial implementation results.
Date:
January 1, 1993
Creator:
Lyttle, T. W.; Smith, D. M.; Burns, M. & Weinrach, J. B.
Object Type:
Article
System:
The UNT Digital Library
Application of ground water tracer methods in straddle packer testing at the ICPP, INEL
The State Oversight Program's straddle packer sampling system was tested at the Idaho National Engineering Laboratory during July--September, 1992, in USGS monitoring well No. 44. The straddle packer was designed for the Oversight Program's ground water research program, to provide a means of characterizing the vertical hydraulic and water quality variations believed to exist in the eastern Snake River Plain aquifer beneath the Idaho National Engineering Laboratory. During the field program, tracer introduction and recovery experiments were conducted to evaluate QA sampling objectives as well as to assess the feasibility of obtaining additional information on aquifer/borehole characteristics such as specific discharge through different aquifer zones, integrity of packer seals, etc. A total of twelve tracer tests were performed on six different intervals from 467 to 600 feet below land surface (ft bls). Lithium bromide powder dissolved in de-ionized water was used as a tracer. All tracer tests were conducted in two phases: Emplacement -- introduction of a slug of a known quantity of tracer, followed by continuous mixing within the test interval for periods ranging from 8 to 72 minutes (without pumping to surface), during which time the tracer was diluted by ground water advection through the test interval; and …
Date:
January 1, 1993
Creator:
Welhan, J. (Geological Survey, Idaho Falls, ID (United States)); Fromm, J. & McCurry, M. (Idaho State Univ., Pocatello, ID (United States). Dept. of Geology)
Object Type:
Article
System:
The UNT Digital Library
Application of lysimeter data as input to performance assessment evaluations of a low-level waste disposal facility
The Field Lysimeter Investigations: Low-Level Waste Data Base Development Program is obtaining information on the performance of radioactive waste in a disposal environment. Waste forms fabricated using ion-exchange resins from EPICOR-II are being tested to develop a low-level waste data base and to obtain information on survivability of waste forms in a disposal environment. The program includes examining radionuclide releases from waste forms in the first seven years of sampling. Also, lysimeter data are applied to performance assessment source term models, and initial results from use of data in two models are being studied.
Date:
January 1, 1993
Creator:
McConnell, J. W., Jr.; Rogers, R. D.; Sullivan, T. M.; Jastrow, J. D.; Hicks, D. S. & Brey, R. R.
Object Type:
Article
System:
The UNT Digital Library
The application of modern safety criteria to restarting and operating the USDOE K-Reactor
The United States Department of Energy's (USDOE's) K-reactor, a defense production reactor located at the Savannah River Site in Aiken, South Carolina, was shut down in the summer of 1988 for safety upgrades to bring it into conformance with modern safety standards prior to restart. Over the course of the succeeding four years, all aspects of the 35-year old reactor, including hardware, operations, and analysis, were upgraded to ensure that the reactor could operate safely according to standards similar to those applied to modern nuclear reactors. This paper describes the decision making processes by which issues were identified, priorities assigned, and analysis improved to enhance reactor safety. Special emphasis is given to the probabilistic risk assessment (PRA) decision making processes used to quantify the risks and consequences of operating the K-reactor, the analytical hierarchy process (AHP) used to identify key phenomena, and modifications made to the RELAP5 computer code to make it applicable to K-reactor analysis. The success of the project was demonstrated when the K-reactor was restarted in the summer of 1992.
Date:
January 1, 1993
Creator:
Dimenna, R. A.; Taylor, G. A. & Brandyberry, M. D.
Object Type:
Article
System:
The UNT Digital Library
Application of precision mechanical engineering techniques to the design of a moderate energy beam transport for the FAA explosive detection system
This paper discusses the application of precision mounting and alignment techniques to a moderate energy beam transport system (MEBT) used on the exit of a 1.75 MeV RFQ. While frequently found in optical systems, techniques-such-as kinematic mounting, and degree-of-freedom decoupling, are not as widely used for accelerator components. The MEBT consist of one permanent magnet quadrupole, four electro magnet quadrupole, and one debuncher cavity. Included in the paper are discussions of design and fabrication considerations as well as, installation, alignment and operations experience during the successful implementation on a working accelerator.
Date:
January 1, 1993
Creator:
Lujan, R. & Christensen, K.
Object Type:
Article
System:
The UNT Digital Library
Application of resonance Raman spectroscopy as a nuclear proliferation detection technology
Resonance Raman spectroscopy (RRS) potentially possesses many of the characteristics of an ideal verification technology. Some of these ideal traits are: very high selectivity and specificity to allow the deconvolution of a mixture of the chemicals of interest, high sensitivity in order to measure a species at trace levels, high reliability and long-term durability, applicability to a wide range of chemicals capability for sensing in a variety of environmental conditions, independence of the physical state of the chemical capability for quantitative analysis, and finally, but no less important capability for full signal development within seconds. In this presentation, the potential of RRS as a detection/identification technology for chemicals pertinent to nuclear materials production and processing will be assessed. A review of the basic principles behind this technique, both theoretical and experimental, will be discussed along with some recent results obtained in this laboratory. Raman scattering is a coherent, inelastic, two-photon scattering process where an exciting photon of energy hv promotes a molecule to a virtual level and the subsequently emitted photon is shifted in frequency in accordance with the rotational-vibrational structure of the irradiated species, therefore providing a unique fingerprint of the molecule. The enhancement of a Raman signal occurs …
Date:
January 1, 1993
Creator:
Sedlacek, A. J., III; Chen, C. L. & Dougherty, D. R.
Object Type:
Article
System:
The UNT Digital Library
Application of the electromagnetic borehole flowmeter and evaluation of previous pumping tests at Paducah Gaseous Diffusion Plant. Final report, June 15, 1992--August 31, 1992
Multi-well pumping tests have been concluded at wells MW79, MW108, and PW1 at the Paducah Gaseous Diffusion Plant (PGDP) to determine the hydraulic properties of the Regional Gravel Aquifer (RGA). Soil cores suggest that the RGA consists of a thin sandy facies (2 to 6 feet) at the top of a thicker (> 10 feet) gravelly facies. Previous analyses have not considered any permeability contrast between the two facies. To assess the accuracy of this assumption, TVA personnel conducted borehole flowmeter tests at wells MW108 and PW1. Well MW79 could not be tested. The high K sand unit is probably 10 times more permeable than comparable zone in the gravelly portion of the RGA. Previous analyses of the three multi-well aquifer tests do not use the same conceptual aquifer model. Data analysis for one pumping test assumed that leakance was significant. Data analysis for another pumping test assumed that a geologic boundary was significant. By collectively analyzing all three tests with the borehole flowmeter results, the inconsistency among the three pumping tests can be explained. Disparity exists because each pumping test had a different placement of observation wells relative to the high K zone delineating by flowmeter testing.
Date:
January 1, 1993
Creator:
Young, S. C.; Julian, S. C. & Neton, M. J.
Object Type:
Report
System:
The UNT Digital Library
Application of Z-contrast imaging to obtain column-by-column spectroscopic analysis of materials
Z-contrast imaging has been shown to be an effective method for obtaining a high-resolution image from a scanning transmission electron microscope (STEM). The incoherent nature of the high-angle scattering makes image interpretation straightforward and intuitive with the resolution limited only by the 2.2 {Angstrom} electron probe. The optimum experimental conditions for Z-contrast imaging also coincide with those used for analytical microscopy, enabling microanalysis to be performed with the same spatial resolution as the image. The detection limits afforded by a parallel detection system for electron energy loss spectroscopy (EELS) allows column-by-column core-loss spectroscopy to be performed using the Z-contrast image to position the electron probe. Preliminary results from the study of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} illustrate the spatial resolution available with this technique and the potential applications for materials science.
Date:
January 1, 1993
Creator:
Browning, N. D. & Pennycook, S. J.
Object Type:
Article
System:
The UNT Digital Library
Applications of mesoscopic physics. [Dept. of Physics, UCLA, Los Angeles, California]
Research activities in the area applications of mesoscopic physics to novel correlations and fluctuations of speckle patterns: imaging and tomography with multiply scattered classical waves'' are briefly summarized. The main thrust in fundamental research is in the general areas of mesoscopic effects in disordered semiconductors and metals and the related field of applications of mesoscopic physics to the subject matter of classical wave propagation through disordered scattering media. Specific topics are Fabry-Perot interferometer with disorder: correlations and light localization; electron-phonon inelastic scattering rate and the temperature scaling exponent in integer quantum Hall effect; and transmission and reflection correlations of second harmonic waves in nonlinear random media. Research in applied physics centered on far infrared photon-assisted transport through quantum point contact devices and photon migration distributions in multiple scattering media. 7 refs.
Date:
January 1, 1993
Creator:
Feng, Shechao.
Object Type:
Report
System:
The UNT Digital Library
Applications of Microwave Radiation Environmental Remediation Technologies
A growing number of environmental remediation technologies (e.g., drying, melting, or sintering) utilize microwave radiation as an integral part of the process. An increasing number of novel applications, such as sustaining low-temperature plasmas or enhancing chemical reactivity, are also being developed. An overview of such technologies being developed by the Department of Energy is presented. A specific example being developed at Argonne National Laboratory, microwave-induced plasma reactors for the destruction of volatile organic compounds, is discussed in more detail.
Date:
January 1, 1993
Creator:
Krause, T. R. & Helt, J. E.
Object Type:
Article
System:
The UNT Digital Library
Applications of the EBR-II Probabilistic Risk Assessment
A Probabilistic Risk Assessment (PRA) of the Experimental Breeder Reactor 11 (EBR-11), a Department of Energy (DOE) Category A research reactor, has recently been completed at Argonne National Laboratory (ANL), and has been performed with close collaboration between PRA analysts and engineering and operations staff. A product of this Involvement of plant personnel has been a excellent acceptance of the PRA as a tool, which has already resulted In a variety of applications of the EBR-11 PRA. The EBR-11 has been used in support of plant hardware and procedure modifications and In new system design work. A new application in support of the refueling safety analysis will be completed in the near future.
Date:
January 1, 1993
Creator:
Roglans, J.: Ragland, W.A. & Hill, D.J.
Object Type:
Report
System:
The UNT Digital Library
Applications of wavelet-based compression to multidimensional earth science data
A data compression algorithm involving vector quantization (VQ) and the discrete wavelet transform (DWT) is applied to two different types of multidimensional digital earth-science data. The algorithm (WVQ) is optimized for each particular application through an optimization procedure that assigns VQ parameters to the wavelet transform subbands subject to constraints on compression ratio and encoding complexity. Preliminary results of compressing global ocean model data generated on a Thinking Machines CM-200 supercomputer are presented. The WVQ scheme is used in both a predictive and nonpredictive mode. Parameters generated by the optimization algorithm axe reported, as are signal-to-noise ratio (SNR) measurements of actual quantized data. The problem of extrapolating hydrodynamic variables across the continental landmasses in order to compute the DWT on a rectangular grid is discussed. Results are also presented for compressing Landsat TM 7-band data using the WVQ scheme.The formulation of the optimization problem is presented along with SNR measurements of actual quantized data. Postprocessing applications are considered in which the seven spectral bands are clustered into 256 clusters using a k-means algorithm and analyzed using the Los Alamos multispectral data analysis program, SPECTRUM, both before and after being compressed using the WVQ program.
Date:
January 1, 1993
Creator:
Bradley, J.N. & Brislawn, C.M.
Object Type:
Article
System:
The UNT Digital Library
Applying environmental externalities to US Clean Coal Technologies for Asia. [Including external environmental costs]
The United States is well positioned to play an expanding role in meeting the energy technology demands of the Asian Pacific Basin, including Indonesia, Thailand, and the Republic of China (ROC-Taiwan). The US Department of Energy Clean Coal Technology (CCT) Demonstration Program provides a proving ground for innovative coal-related technologies that can be applied domestically and abroad. These innovative US CCTs are expected to satisfy increasingly stringent environmental requirements while substantially improving power generation efficiencies. They should also provide distinct advantages over conventional pulverized coal-fired combustors. Finally, they are expected to be competitive with other energy options currently being considered in the region. This paper presents potential technology scenarios for Indonesia, Thailand, and the ROC-Taiwan and considers an environmental cost-benefit approach employing a newly developed method of applying environmental externalities. Results suggest that the economic benefits from increased emission control can indeed be quantified and used in cost-benefit comparisons, and that US CCTs can be very cost effective in reducing emissions.
Date:
January 1, 1993
Creator:
Szpunar, C. B. & Gillette, J. L.
Object Type:
Article
System:
The UNT Digital Library
AQUIS: A PC-based source information manager
The Air Quality Utility Information System (AQUIS) was developed to calculate emissions and track them along with related information about sources, stacks, controls, and permits. The system runs on IBM- compatible personal computers with dBASE IV and tracks more than 1, 200 data items distributed among various source categories. AQUIS is currently operating at 11 US Air Force facilities, which have up to 1, 000 sources, and two headquarters. The system provides a flexible reporting capability that permits users who are unfamiliar with database structure to design and prepare reports containing user- specified information. In addition to the criteria pollutants, AQUIS calculates compound-specific emissions and allows users to enter their own emission estimates.
Date:
January 1, 1993
Creator:
Smith, A. E.; Huber, C. C.; Tschanz, J. (Argonne National Lab., IL (United States). Environmental Assessment and Information Sciences Div.) & Ryckman, S. J. Jr. (Headquarters, Air Force Materiel Command, Wright-Patterson AFB, OH (United States). Environmental Engineering Div.)
Object Type:
Article
System:
The UNT Digital Library