Collection
Office of Scientific & Technical Information Technical Reports
14,165
Texas State Publications
450
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
219 More
Country
States
Year
Month
Language
15,314 Matching Results
Results open in a new window/tab.
Surface modification of sapphire for IR window application
Two surface modification techniques, a``super polish`` (SP), and ion implantation, were evaluated for improving the mechanical performance of sapphire IR window material. Both techniques increased the average strength as measured by 4-point bend tests and were effective in preventing the propagation of surface flaws. Ion implantation improved the reliability at lower stresses more than the SP. Neither process significantly affected the IR transmission. The SP produced a smoother surface as shown by optical scatter measurements.
Date:
August 1, 1993
Creator:
McHargue, C. J. & Snyder, W. B., Jr.
Object Type:
Article
System:
The UNT Digital Library
BOAST II for the IBM 3090 and RISC 6000
BOAST II simulates isothermal, darcy flow in three dimensions. It assumes that reservoir liquids can be described in three fluid phases (oil, gas, and water) of constant composition, with physical properties that depend on pressure, only. These reservoir fluid approximations are acceptable for a large percentage of the world's oil and gas reservoirs. Consequently, BOAST II has a wide range of applicability. BOAST II can simulate oil and/or gas recovery by fluid expansion, displacement, gravity drainage, and capillary imbibition mechanisms. Typical field production problems that BOAST II can handle include primary depletion studies, pressure maintenance by water and/or gas injection, and evaluation of secondary recovery waterflooding and displacement operations. Technically, BOAST II is a finite, implicit pressure, explicit saturation (IMPES) numerical simulator. It applies both direct and iterative solution techniques for solving systems of algebraic equations. The well model allows specification of rate or pressure constraints on well performance, and the user is free to add or to recomplete wells during the simulation. In addition, the user can define multiple rock and PVT regions and can choose from three aquifer models. BOAST II also provides flexible initialization, a bubble-point tracking scheme, automatic time-step control, and a material balance check on …
Date:
May 1, 1993
Creator:
Hebert, P.; Bourgoyne, A. T., Jr. & Tyler, J.
Object Type:
Report
System:
The UNT Digital Library
BOAST II for the IBM 3090 and RISC 6000. Final report
BOAST II simulates isothermal, darcy flow in three dimensions. It assumes that reservoir liquids can be described in three fluid phases (oil, gas, and water) of constant composition, with physical properties that depend on pressure, only. These reservoir fluid approximations are acceptable for a large percentage of the world`s oil and gas reservoirs. Consequently, BOAST II has a wide range of applicability. BOAST II can simulate oil and/or gas recovery by fluid expansion, displacement, gravity drainage, and capillary imbibition mechanisms. Typical field production problems that BOAST II can handle include primary depletion studies, pressure maintenance by water and/or gas injection, and evaluation of secondary recovery waterflooding and displacement operations. Technically, BOAST II is a finite, implicit pressure, explicit saturation (IMPES) numerical simulator. It applies both direct and iterative solution techniques for solving systems of algebraic equations. The well model allows specification of rate or pressure constraints on well performance, and the user is free to add or to recomplete wells during the simulation. In addition, the user can define multiple rock and PVT regions and can choose from three aquifer models. BOAST II also provides flexible initialization, a bubble-point tracking scheme, automatic time-step control, and a material balance check on …
Date:
May 1, 1993
Creator:
Hebert, P.; Bourgoyne, A. T., Jr. & Tyler, J.
Object Type:
Report
System:
The UNT Digital Library
Pilot oil atlas for Louisiana. Final report
An interdisciplinary research team of engineers, geologists, and computer scientists was assembled at LSU to develop unproved methods for prospecting for bypassed oil and to support oil and gas producers in Louisiana. The overall objective of the project was to develop methods for extending the producing life of several types of reservoirs by reducing the amount of oil being bypassed and abandoned. As part of this work, the team collected information available from public sources for several example reservoirs. One task of the project was to develop a format for the compilation of the extensive but cumbersome Louisiana reservoir data so that it could be used by government and industry to evaluate the resource and plan future activities. The existing information system maintained by Louisiana is a Production Audit Reporting System (PARS). It was designed to allow auditing of oil and gas production and severance taxes associated with this production. It was not intended to be used as a database for determining reservoir recovery efficiency or prospecting for oil and gas. Its use for these purposes, however, has been increasing. The database format suggested in this report would allow production information to be easily displayed by reservoir as well as …
Date:
January 1, 1993
Creator:
Bourgoyne, A. T., Jr.; Kimbrell, C. & Gao, Weigang
Object Type:
Report
System:
The UNT Digital Library
Hanford Site ground-water monitoring for 1992
Monitoring activities were conducted to determine the distribution of radionuclides and hazardous chemicals present in ground water as a result of Hanford Site operations and, whenever possible, relate the distribution of these constituents to Site operations. A total of 720 wells were sampled during 1992 by all Hanford ground-water monitoring activities. The Ground-Water Surveillance Project prepared water-table maps of DOE`s Hanford Site for June 1992 from water-level elevations measured in 287 wells across the Hanford Site and outlying areas. These maps are used to infer ground-water flow directions and gradients for the interpretation of contaminant transport. Water levels beneath the 200 Areas decreased as much as 0.75 m (2.5 ft) between December 1991 and December 1992. Water levels in the Cold Creek Valley decreased approximately 0.5 m in that same period. The water table adjacent to the Columbia River along the Hanford Reach continues to respond significantly to fluctuations in river stage. These responses were observed in the 100 and 300 areas. The elevation of the ground-water mound beneath B Pond did not change significantly between December 1991 and December 1992. However, water levels from one well located at the center of the mound indicate a water-level rise of approximately …
Date:
June 1, 1993
Creator:
Dresel, P. E.; Newcomer, D. R.; Evans, J. C.; Webber, W. D.; Spane, F. A., Jr.; Raymond, R. G. et al.
Object Type:
Report
System:
The UNT Digital Library
Selected hydraulic test analysis techniques for constant-rate discharge tests
The constant-rate discharge test is the principal field method used in hydrogeologic investigations for characterizing the hydraulic properties of aquifers. To implement this test, the aquifer is stressed by withdrawing ground water from a well, by using a downhole pump. Discharge during the withdrawal period is regulated and maintained at a constant rate. Water-level response within the well is monitored during the active pumping phase (i.e., drawdown) and during the subsequent recovery phase following termination of pumping. The analysis of drawdown and recovery response within the stress well (and any monitored, nearby observation wells) provides a means for estimating the hydraulic properties of the tested aquifer, as well as discerning formational and nonformational flow conditions (e.g., wellbore storage, wellbore damage, presence of boundaries, etc.). Standard analytical methods that are used for constant-rate pumping tests include both log-log type-curve matching and semi-log straight-line methods. This report presents a current state of the art'' review of selected transient analysis procedures for constant-rate discharge tests. Specific topics examined include: analytical methods for constant-rate discharge tests conducted within confined and unconfined aquifers; effects of various nonideal formation factors (e.g., anisotropy, hydrologic boundaries) and well construction conditions (e.g., partial penetration, wellbore storage) on constant-rate test …
Date:
March 1, 1993
Creator:
Spane, F. A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Application of the Ferris test methods for estimating hydraulic properties near a river boundary
Standard hydraulic test methods, such as constant-rate pumping tests, may be impractical for characterizing hazardous waste sites located near fluctuating hydrologic boundaries such as rivers or oceans. An alternate approach for hydrologic characterization at these locations is to analyze the groundwater responses associated with river-stage or tidal fluctuations to aquifer properties (i.e., hydraulic diffusivity). Based on this approach, aquifer properties were determined for an area adjoining the Columbia River on the Hanford Site using two sinusoidal analysis techniques described in Ferris (1952, 1963). The first method uses the observed groundwater time-lag response, the second uses the amplitude ratio of well water level to river stage. Both techniques assume the river fluctuations can be approximated by a sinusoidal pattern. A range for hydraulic conductivity was calculated based on the hydraulic diffusivity estimates obtained from the methods together with the known aquifer thickness (50 ft) and assumed specific yield (0.1). The analysis methods produced two overlapping hydraulic conductivity ranges, with the Ferris time-lag analysis method forming the upper bound of the range, and the Ferris well water-level/river-stage amplitude ratio method forming the lower bound. Results from a nearby standard constant-rate discharge aquifer test were also examined for comparison. These results were within …
Date:
October 1, 1993
Creator:
Gilmore, T. J. & Spane, F. A., Jr.
Object Type:
Article
System:
The UNT Digital Library
Preliminary potentiometric map and flow dynamic characteristics for the upper-basalt confined aquifer system
This report presents the first comprehensive Hanford Site-wide potentiometric map for the upper-basalt confined aquifer system (i.e., the upper Saddle Mountains Basalt). In constructing the potentiometric map, over forty on-site and off-site monitoring wells and boreholes were used. The potentiometric map developed for the upper-basalt confined aquifer is consistent with the areal head pattern indicated for the Mabton interbed, which is a deeper and more areally extensive confined aquifer underlying the Hanford Site. Salient features for the upper-basalt confined aquifer system potentiometric map are described.
Date:
September 1, 1993
Creator:
Spane, F. A., Jr. & Raymond, R. G.
Object Type:
Report
System:
The UNT Digital Library
Selected hydraulic test analysis techniques for constant-rate discharge tests
The constant-rate discharge test is the principal field method used in hydrogeologic investigations for characterizing the hydraulic properties of aquifers. To implement this test, the aquifer is stressed by withdrawing ground water from a well, by using a downhole pump. Discharge during the withdrawal period is regulated and maintained at a constant rate. Water-level response within the well is monitored during the active pumping phase (i.e., drawdown) and during the subsequent recovery phase following termination of pumping. The analysis of drawdown and recovery response within the stress well (and any monitored, nearby observation wells) provides a means for estimating the hydraulic properties of the tested aquifer, as well as discerning formational and nonformational flow conditions (e.g., wellbore storage, wellbore damage, presence of boundaries, etc.). Standard analytical methods that are used for constant-rate pumping tests include both log-log type-curve matching and semi-log straight-line methods. This report presents a current ``state of the art`` review of selected transient analysis procedures for constant-rate discharge tests. Specific topics examined include: analytical methods for constant-rate discharge tests conducted within confined and unconfined aquifers; effects of various nonideal formation factors (e.g., anisotropy, hydrologic boundaries) and well construction conditions (e.g., partial penetration, wellbore storage) on constant-rate test …
Date:
March 1, 1993
Creator:
Spane, F. A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional conceptual model for the Hanford Site unconfined aquifer system, FY 1993 status report
The ground water underlying parts of the Hanford Site (Figure 1.1) contains radioactive and chemical contaminants at concentrations exceeding regulatory standards (Dresel et al. 1993). The Hanford Site Ground-Water Surveillance Project, operated by Pacific Northwest Laboratory (PNL), is responsible for monitoring the movement of these contaminants to ensure that public health and the environment are protected. To support the monitoring effort, a sitewide three-dimensional ground-water flow model is being developed. This report provides an update on the status of the conceptual model that will form the basis for constructing a numerical three-dimensional flow model for, the site. Thorne and Chamness (1992) provide additional information on the initial development of the three-dimensional conceptual model.
Date:
December 1, 1993
Creator:
Thorne, P. D.; Chamness, M. A.; Spane, F. A., Jr.; Vermeul, V. R. & Webber, W. D.
Object Type:
Report
System:
The UNT Digital Library
Firing Ranges: The Airborne Lead Dust Hazard. Shooter's Guide
Booklet outlining information about lead exposure related to handling guns and ammunition, possible effects of lead dust on shooters and their families, and suggestions for increasing safety related to lead.
Date:
October 1993
Creator:
Texas. Department of Health.
Object Type:
Pamphlet
System:
The Portal to Texas History
The Water Source, February 1993
Quarterly newsletter of the Edwards Underground Water District discussing news and activities of the organization as well as other information related to water in southern Texas.
Date:
February 1993
Creator:
Edwards Underground Water District (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Alzheimer's Disease Newsletter, Fall/Winter 1993
Newsletter published by the Texas Department of Health regarding news and events related to the agency's work wih Alzheimer's disease as well as symptoms, treatments, and other information of interest to caregivers.
Date:
Autumn 1993
Creator:
Texas. Department of Health.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Balanced Dairying: Production, Volume 17, Number 2, April 1993
Newsletter of the Texas Agricultural Extension Service discussing topics related to raising dairy cows, dairy production, and managing dairy operations.
Date:
April 1993
Creator:
Texas Agricultural Extension Service
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bay Line, Number 17, Winter 1993
Quarterly newsletter discussing news, events, and other information related to the management of Galveston Bay and the surrounding watershed.
Date:
Winter 1993
Creator:
Galveston Bay National Estuary Program
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bay Line, Number 16, Fall 1993
Quarterly newsletter discussing news, events, and other information related to the management of Galveston Bay and the surrounding watershed.
Date:
Autumn 1993
Creator:
Galveston Bay National Estuary Program
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Beef Cattle Research in Texas: 1992
Consolidated progress report providing a summary of research conducted at the experiment station during the prior year related to beef cattle, including: reproduction, meats, care, and progress reports.
Date:
July 1993
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History
Balanced Dairying: Production, Volume 17, Number 3, October 1993
Newsletter of the Texas Agricultural Extension Service discussing topics related to raising dairy cows, dairy production, and managing dairy operations.
Date:
October 1993
Creator:
Texas Agricultural Extension Service
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Nondimensional transport studies in TFTR
The machine parameters (I[sub p], P[sub heat], R) required for ignition in ITER have generally been extrapolated from power-law regression fits to global [tau][sub E] measurements on existing tokamaks. There remain important choices to be made in the form of the scaling relation which have not yet been resolved by theory. In particular, power flow Q(r) through a magnetic flux surface should scale as Q(r) = Q[sub Bohm]F where F = F([rho]*,[beta],[nu]*,s,T[sub e]/T[sub i],...) is a function of local, nondimensional plasma parameters and Q[sub Bohm] [proportional to] [n[sub e]T[sub e][sup 2]a/eB]. Projections to ITER can be reduced to establishing the dependence of F on [rho]* = [rho][sub i]/a, because one can create plasmas in today's tokamaks which have similar values of the other nondimensional parameters. Two common scalings suggested by theory are Bohm (F independent of [rho]*) and gyroBohm (F [proportional to] [rho]*). Experiments have been carried out on TFTR to ascertain the dependence of F on [rho]*, [nu]*, and [beta] in L-mode plasmas, holding the other nondimensional parameters fixed. The observed variation of heat flow with [rho]* was observed to be better described by Bohm scaling than gyroBohm. Comparisons with the critical gradient temperature transport model, which is gyroBohm …
Date:
April 1, 1993
Creator:
Scott, S. D.; Mikkelsen, D. R.; Perkins, F. W.; Bell, M. G.; Bell, R. E.; Bush, C. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Recycling perturbations of supershot plasmas
Thermal heat transport in the core (r/a [le] 0.5) of beam-heated TFTR plasmas vanes by more than a factor of five between L-mode and supershot plasmas for the same I[sub p], B[sub T], and P[sub b]. Operationally, this variation is strongly correlated with the particle recycling coefficient of the carbon-carbon composite inner bumper limiter. The mechanisms underlying this correlation are not understood. This paper describes studies of the edge ion temperature, which is an important parameter if [tau][sub E] is controlled by ion temperature gradient driven turbulence. We find that a edge electron temperature scales simply with power per electron, irrespective of the recycling state of the limiter. By contrast, the scaling of edge ion temperature is strongly affected by the recycling state of the limiter. Much higher edge ion temperatures are attained in low-recycling plasmas for the same power per particle. In addition, perturbative studies of recycling effects on transport have been carried out by puffing in large amounts of helium into a supershot plasma. The local core transport coefficients increase on a transport time scale ([approximately]100 ms), much faster than the current relaxation time scale. This suggests that the current profile is not responsible for the favorable energy …
Date:
March 1, 1993
Creator:
Scott, S. D.; McCune, D. C.; Bell, M. G.; Bell, R.; Budny, R. V.; Fredrickson, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Helium, iron and electron particle transport and energy transport studies on the TFTR tokamak
Results from helium, iron, and electron transport on TFTR in L-mode and Supershot deuterium plasmas with the same toroidal field, plasma current, and neutral beam heating power are presented. They are compared to results from thermal transport analysis based on power balance. Particle diffusivities and thermal conductivities are radially hollow and larger than neoclassical values, except possibly near the magnetic axis. The ion channel dominates over the electron channel in both particle and thermal diffusion. A peaked helium profile, supported by inward convection that is stronger than predicted by neoclassical theory, is measured in the Supershot The helium profile shape is consistent with predictions from quasilinear electrostatic drift-wave theory. While the perturbative particle diffusion coefficients of all three species are similar in the Supershot, differences are found in the L-Mode. Quasilinear theory calculations of the ratios of impurity diffusivities are in good accord with measurements. Theory estimates indicate that the ion heat flux should be larger than the electron heat flux, consistent with power balance analysis. However, theoretical values of the ratio of the ion to electron heat flux can be more than a factor of three larger than experimental values. A correlation between helium diffusion and ion thermal transport …
Date:
March 1, 1993
Creator:
Synakowski, E. J.; Efthimion, P. C.; Rewoldt, G.; Stratton, B. C.; Tang, W. M.; Grek, B. et al.
Object Type:
Report
System:
The UNT Digital Library
Performance and scalability aspects of directory-based cache coherence in shared-memory multiprocessors
We present a study that accentuates the performance and scalability aspects of directory-based cache coherence in multiprocessor systems. Using a multiprocessor with a software-based coherence scheme, efficient implementations rely heavily on the programmer`s ability to explicitly manage the memory system, which is typically handled by hardware support on other bus-based, shared memory multiprocessors. We describe a scalable, shared memory, cache coherent multiprocessor and present simulation results obtained on three parallel programs. This multiprocessor configuration exhibits high performance at no additional parallel programming cost.
Date:
May 1, 1993
Creator:
Picano, S.; Meyer, D. G.; Brooks, E. D., III & Hoag, J. E.
Object Type:
Article
System:
The UNT Digital Library
Immobilised sulphur compounds as solid calibrants for TPR
Sulphur compounds immobilised on silica are ideal calibrants for TPR (temperature programmed reduction) and should find applications in other techniques, for example, Ledge XANES and temperature programmed oxidation being used to specify organic sulphur forms in coals. The atmospheric pressure TPR traces of the non-thiophenic compounds investigated are dominated by high temperature peaks from secondary reactions which do not appear to be affected by immobilisation on the silica. As a consequence of the high surface coverages used, such reactions are still evident with 150 bar hydrogen although the characteristic reduction temperatures of the non-thiophenic compounds investigated are all below 400{degrees}C and well resolved from that of dibenzothiophene. The high pressure TPR experiments on the immobilised substrates have validated the previous conclusions on coals.
Date:
October 1, 1993
Creator:
Ismail, K.; Garcia, R.; Mitchell, S. C.; Snape, C. E.; Buchanan, A. C., III; Britt, P. F. et al.
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