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Texas Register, Volume 49, Number 8, Pages 933-1158, February 23, 2024
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
February 23, 2024
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bulletin on Texas State Finance: 1979, Number 5
Periodic bulletin analyzing issues related to Texas legislation. This issue focuses on property tax relief.
Date:
February 23, 1979
Creator:
Texas Research League
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Chemical Separation of Isotopes Section Semiannual Progress Report for Period Ending June 30, 1955
The countercurrent gas-liquid system BF3(g)—anisole·BF3(l) for the concentration of boron isotopes has been studied. The single-storage separation factor varies from 1.039 at 0°C to 1.029 at 30°C. Rate of exchange is rapid, and, with efficient contacting equipment, complete exchange may be obtained in less than 15 sec. A total separation of 1.525 has been realized in laboratory equipment. The critical-product reflux reaction is quite efficient. Only about 55 moles of BF3 remain in each million moles of effluent solvent under laboratory conditions. The vapor pressure of BF3 over the complex rises sharply as the temperature is increased. At 0°C the pressure is 150 mm Hg, and at 40°C the pressure has risen to 1800 mm Hg. From vapor-pressure measurements, an approximate upper limit of ΔH= -12kcal per mole of complex was calculated for the reaction [equation not transcribed]. Qualitative tests indicate good resistance of anisole to decomposition by BF3 under plant conditions. The uncatalyzed exchange of boron between BF3 and BCl3 was found to be too slow to be exploited in a countercurrent system. The single-stage, equilibrium separation factor for the Nitrox system is a function of acid concentration. At 26°C the factor ranges from 1.064 with 1 M acid …
Date:
February 23, 1956
Creator:
Clewett, G. H. & Drury, J. S.
Object Type:
Report
System:
The UNT Digital Library
A Monte Carlo Estimation of the High Energy Neutron Flux Distribution in the ORNL Graphite Reactor
The flux through a given region is proportional to the total lengths of the neutron flight paths that intersect that region. The analytical Monte Carlo procedure manufactured neutron flight paths and totaled the lengths of all paths intercepted by the regions illustrated in Figure 1. The procedure was designed to utilize the various symmetries in the lattice. / Consider a portion of the lattice whose planar cross-section is shown in Figure 5. If R is the region in which the flux is to be estimated and F the fuel rod in which the neutron originated, then flight path P results in an intercepted length whose reflection in the plane is L. On the other hand flight path P' intercepts R' with length L'. R' is not the region to be studied, but a translation of the flight path P' to F' would result in the neutron intercepting R. The origin in P was arbitrary. For each neutron originating in P another could, with equal probability, have originated in P' with parallel paths. Hence consulting L' in R' towards the total flux is equivalent to starting a neutron at P'. Thus consideration of all regions symmetric to R with respect to …
Date:
February 23, 1955
Creator:
Moshman, Jack
Object Type:
Report
System:
The UNT Digital Library
A Partially Degenerate, Relativistic, Ideal Electron Gas
Tables of the electron pressure and kinetic energy for a partially degenerate, relativistic, ideal electron gas are computed by numerical integration using an IBM 7090 electronic calculator. These are given in terms of log10(B) and log10(0), where B is the ratio of the temperature to the rest mass of the electron and (O) is proportional to the numerical density of electrons. The tables include values of T from 5 million to 400 billion degrees and cover the range of electron densities from the region of a perfect gas to the region of complete degeneracy.
Date:
February 23, 1961
Creator:
Grasberger, William H.
Object Type:
Report
System:
The UNT Digital Library
Transport in compact tori
The parameter B/sub e//nr/sub p/ (here, B/sub e/ is applied magnetic field strength, nr/sub p/ is the plasma density-radius product) is proposed as a key parameter for spheromak heating studies. If B/sub e//nr/sub p/ is too large, increased magnetic fluctuations limit heating; low B/sub e//nr/sub p/ value results in excessive radiation losses. An optimum range appears to be B/sub e//nr/sub p/ approx. 1 to 5 x 10/sup -20/ Wb.
Date:
February 23, 1983
Creator:
Miley, G. H.
Object Type:
Article
System:
The UNT Digital Library
Determination of the rate and efficiency of nitrogen transfer from phytoplankton to zooplankton using nitrogen-15 as a tracer. Final report
The rate of assimilated nitrogen transfer from phytoplankton to zooplankton was measured under field conditions for natural mixed zooplankton populations using a nitrogen-15 tracer technique. The variability in rates, which ranged from 0.261 to 1.792 gram-atoms of phytoplankton nitrogen/gram-atoms of zooplankton nitrogen/24 hours, are thought to reflect a variability in the age frequency distribution of the zooplankton population. The data were used to calculate assimilation efficiencies which were found to range from 25.4 to 66.1 percent. The efficiency of 66.1 percent was taken to be the most accurate measurement for reasons discussed in the text.
Date:
February 23, 1976
Creator:
Harris, V M
Object Type:
Report
System:
The UNT Digital Library
DT fusion neutron irradiation of BPNL graphite irradiation capsule, LLL niobium, and LLL SiC crystals
The experimental procedure for irradiation testing of the above specimens is presented. No results are given. (MOW)
Date:
February 23, 1976
Creator:
MacLean, S. C.
Object Type:
Report
System:
The UNT Digital Library
Quantitative analysis of thin foils using backscattering measurements. [He implants in Pd; composite Al/parylene]
Backscattering of 1.25-MeV protons and alpha particles from thin foils is used for a nondestructive quantitative elemental analysis of thin foils. The detection of helium that had previously been implanted into a 1350 A palladium foil and the analysis of a composite aluminum and parylene foil are presented as examples of this technique.
Date:
February 23, 1971
Creator:
Mervine, L. R.; Der, R. C.; Fortner, R. J.; Kavanagh, T. M. & Khan, J. M.
Object Type:
Report
System:
The UNT Digital Library
Equilibrium water vapor pressure and total moisture content measurements on TATB
Equilibrium water vapor pressure and total moisture content were measured for samples of TATB-10 percent Kel-F, TATB-6 percent Estane, and TATB-9 percent Viton in a temperature range from 296 to 365/sup 0/K. Heats of vaporization were obtained for temperatures from 296 to 333/sup 0/K. Below 333/sup 0/K the water in the samples behaved as dissolved water and the Clausius-Clapeyron equation was applicable, while above 333/sup 0/K the water dissolved in the samples became very mobile and for practical purposes it was considered to be available in its entirety in the gas phase. The total moisture content of the samples was found to be <0.0021, 0.0102, and 0.0165 wt. percent for TATB-Kel-F, TATB-Estane, and TATB-Viton, respectively. The data indicate that the transport of water in the samples was controlled by the permeation characteristics of the binders. Fair agreement was found between published relative permeation constants for the three binders and those derived from the experimental results.
Date:
February 23, 1976
Creator:
Colmenares, C. & McDavid, L. C.
Object Type:
Report
System:
The UNT Digital Library
Index to Nuclear Safety. A technical progress review by chronology, permuted title, and author. Vol. 11, No. 1--Vol. 17, No. 6
This index to Nuclear Safety covers articles in Nuclear Safety Vol. 11, No. 1 (Jan.-Feb. 1970), through Vol. 17, No. 6 (Nov.-Dec. 1976). The index includes a chronological list of articles (including abstract) followed by KWIC and Author Indexes. Nuclear Safety, a bimonthly technical progress review prepared by the Nuclear Safety Information Center, covers all safety aspects of nuclear power reactors and associated facilities. The index lists over 350 technical articles in the last six years of publication.
Date:
February 23, 1977
Creator:
Cottrell, W. B. & Klein, A.
Object Type:
Report
System:
The UNT Digital Library
Texas Preventable Disease News, Volume 45, Number 8, February 23, 1985
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
February 23, 1985
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
COG validation: SINBAD Benchmark Problems
We validated COG, a 3D Monte Carlo radiation transport code, against experimental data and MNCP4C simulations from the Shielding Integral Benchmark Archive Database (SINBAD) compiled by RSICC. We modeled three experiments: the Osaka Nickel and Aluminum sphere experiments conducted at the OKTAVIAN facility, and the liquid oxygen experiment conducted at the FNS facility. COG results are in good agreement with experimental data and generally within a few % of MCNP results. There are several possible sources of discrepancy between MCNP and COG results: (1) the cross-section database versions are different, MCNP uses ENDFB VI 1.1 while COG uses ENDFB VIR7, (2) the code implementations are different, and (3) the models may differ slightly. We also limited the use of variance reduction methods when running the COG version of the problems.
Date:
February 23, 2004
Creator:
Lent, E M; Sale, K E; Buck, R M & Descalle, M
Object Type:
Report
System:
The UNT Digital Library
Diagnostic Systems Approach to Watershed Management
The water quality of discharge from the surface water system is ultimately dictated by land use and climate within the watershed. Water quality has vastly improved from point source reduction measures, yet, non-point source pollutants continue to rise. 30 to 40% of rivers still do not meet water quality standards for reasons that include impact from urban storm water runoff, agricultural and livestock runoff, and loss of wetlands. Regulating non-point source pollutants proves to be difficult since specific dischargers are difficult to identify. However, parameters such as dissolved organic carbon (DOC) limit the amounts of chlorination due to simultaneous disinfection by-product formation. The concept of watershed management has gained much ground over the years as a means to resolve non-point source problems. Under this management scheme stakeholders in a watershed collectively agree to the nature and extent of non-point sources, determine water quality causes using sound scientific approaches, and together develop and implement a corrective plan. However, the ''science'' of watershed management currently has several shortcomings according to a recent National Research Council report. The scientific component of watershed management depends on acquiring knowledge that links water quality sources with geographic regions. However, there is an observational gap in this …
Date:
February 23, 2001
Creator:
Davisson, M L
Object Type:
Report
System:
The UNT Digital Library
RCRA Assessment Plan for Single-Shell Tank Waste Management Area T at the Hanford Site
A groundwater quality assessment plan was prepared to investigate the rate and extent of aquifer contamination beneath Waste Management Area T at the Hanford Site in Washington State. This plan is an update of a draft plan issued in January 1999, which guided work performed in fiscal year 2000.
Date:
February 23, 2001
Creator:
Hodges, Floyd N. & Chou, Charissa J.
Object Type:
Report
System:
The UNT Digital Library
Charge-state distribution and Doppler effect in an expanding photoionized plasma
None
Date:
February 23, 2004
Creator:
Foord, M E; Heeter, R F; Thoe, R S; Chung, H; Liedahl, D A; Goldstein, W H et al.
Object Type:
Article
System:
The UNT Digital Library
Material transfer system in support of the plutonium immobilization program
The Plutonium Immobilization Project is currently undertaking formulation and process development to demonstrate the immobilization of surplus plutonium in a titanate-based ceramic. These ceramic forms will be encapsulated within canisters containing high level waste glass for geologic disposal. Process development work is being conducted with sub-scale, process prototypic equipment. Final validation of the process will be done using actual plutonium material and functionally prototypic equipment within a glovebox. Due to the radioactive nature of the material, remote material handling is necessary to reduce the radiation exposure to the operators. A remote operated Material Transfer System to interface with process equipment has been developed.
Date:
February 23, 2000
Creator:
Pak, D
Object Type:
Article
System:
The UNT Digital Library
The use of magnetron arrays for depositing large-area oxide coatings
The application of coatings over large areas can be approached through the use of large deposition sources. A versatile alternative, e.g. to long rectangular magnetrons, are linear arrays of circular planar magnetrons to process coatings over wide path lengths. They investigate the feasibility of using a linear array of 76 mm diameter magnetron sources operated in the rf mode to deposit oxide target materials across a path in excess of 0.7 m wide. Specific results are given for the case of a 2 {micro}m thick, alumina coating.
Date:
February 23, 2000
Creator:
Jankowski, Alan Frederic; McKernan, M. & Chesser, J.
Object Type:
Article
System:
The UNT Digital Library
Biogeochemical Proxies in Scleractinian Corals used to Reconstruct Ocean Circulation
We utilize monthly {sup 14}C data derived from coral archives in conjunction with ocean circulation models to address two questions: (1) how does the shallow circulation of the tropical Pacific vary on seasonal to decadal time scales and (2) which dynamic processes determine the mean vertical structure of the equatorial Pacific thermocline. Our results directly impact the understanding of global climate events such as the El Nino-Southern Oscillation (ENSO). To study changes in ocean circulation and water mass distribution involved in the genesis and evolution of ENSO and decadal climate variability, it is necessary to have records of climate variables several decades in length. Continuous instrumental records are limited because technology for continuous monitoring of ocean currents has only recently been available, and ships of opportunity archives such as COADS contain large spatial and temporal biases. In addition, temperature and salinity in surface waters are not conservative and thus can not be independently relied upon to trace water masses, reducing the utility of historical observations. Radiocarbon ({sup 14}C) in sea water is a quasi-conservative water mass tracer and is incorporated into coral skeletal material, thus coral {sup 14}C records can be used to reconstruct changes in shallow circulation that would …
Date:
February 23, 2001
Creator:
Guilderson, T. P.; Kashgarian, M. & Schrag, D. P.
Object Type:
Article
System:
The UNT Digital Library
New methods in plasma simulation
The development of implicit methods of particle-in-cell (PIC) computer simulation in recent years, and their merger with older hybrid methods have created a new arsenal of simulation techniques for the treatment of complex practical problems in plasma physics. The new implicit hybrid codes are aimed at transitional problems that lie somewhere between the long time scale, high density regime associated with MHD modeling, and the short time scale, low density regime appropriate to PIC particle-in-cell techniques. This transitional regime arises in ICF coronal plasmas, in pulsed power plasma switches, in Z-pinches, and in foil implosions. Here, we outline how such a merger of implicit and hybrid methods has been carried out, specifically in the ANTHEM computer code, and demonstrate the utility of implicit hybrid simulation in applications. 25 refs., 5 figs.
Date:
February 23, 1990
Creator:
Mason, R. J.
Object Type:
Article
System:
The UNT Digital Library
HyperFlow Theory Manual
This document presents the underlying theory for an unsteady computational model of the transient aerothermodynamics of a deformable vehicle entering an atmosphere at hypersonic speeds. Many unique features of the problem require unusual computational capabilities. The large accelerations associated with the vehicle's flight dynamics results in the body-fixed reference frame being non-inertial, and the governing equations must be modified to include this effect. The vehicle's structural deformations and ablation requires the inclusion of the effects of a moving solid boundary, with a nonuniform mass flux across that boundary. A computational chemistry capability must be included to treat the thermochemical nonequilibrium of the high-temperature gas dynamics, and the reactions between the ablation products and the dissociated air. The theory required to treat these phenomena are described in this report.
Date:
February 23, 2004
Creator:
Felker, F F
Object Type:
Report
System:
The UNT Digital Library
Protein Model Database
The phenomenal success of the genome sequencing projects reveals the power of completeness in revolutionizing biological science. Currently it is possible to sequence entire organisms at a time, allowing for a systemic rather than fractional view of their organization and the various genome-encoded functions. There is an international plan to move towards a similar goal in the area of protein structure. This will not be achieved by experiment alone, but rather by a combination of efforts in crystallography, NMR spectroscopy, and computational modeling. Only a small fraction of structures are expected to be identified experimentally, the remainder to be modeled. Presently there is no organized infrastructure to critically evaluate and present these data to the biological community. The goal of the Protein Model Database project is to create such infrastructure, including (1) public database of theoretically derived protein structures; (2) reliable annotation of protein model quality, (3) novel structure analysis tools, and (4) access to the highest quality modeling techniques available.
Date:
February 23, 2005
Creator:
Fidelis, K; Adzhubej, A; Kryshtafovych, A & Daniluk, P
Object Type:
Report
System:
The UNT Digital Library
Oxidation Resistance of Ru-Capped EUV Multilayers
Differently prepared Ru-capping layers, deposited on Mo/Si EUV multilayers, have been characterized using a suite of metrologies to establish their baseline structural, optical, and surface properties in as-deposited state. Same capping layer structures were tested for their thermal stability and oxidation resistance. Post-mortem characterization identified changes due to accelerated tests. The best performing Ru-capping layer structure was studied in detail with transmission electron microscopy to identify the grain microstructure and texture. This information is essential for modeling and performance optimization of EUVL multilayers.
Date:
February 23, 2005
Creator:
Bajt, S.; Dai, Z.; Nelson, E. J.; Wall, M. A.; Alameda, J.; Nguyen, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Reconstructing Ocean Circulation using Coral (triangle)14C Time Series
We utilize monthly {sup 14}C data derived from coral archives in conjunction with ocean circulation models to address two questions: (1) how does the shallow circulation of the tropical Pacific vary on seasonal to decadal time scales and (2) which dynamic processes determine the mean vertical structure of the equatorial Pacific thermocline. Our results directly impact the understanding of global climate events such as the El Nino-Southern Oscillation (ENSO). To study changes in ocean circulation and water mass distribution involved in the genesis and evolution of ENSO and decadal climate variability, it is necessary to have records of climate variables several decades in length. Continuous instrumental records are limited because technology for continuous monitoring of ocean currents (e.g. satellites and moored arrays) has only recently been available, and ships of opportunity archives such as COADS contain large spatial and temporal biases. In addition, temperature and salinity in surface waters are not conservative and thus can not be independently relied upon to trace water masses, reducing the utility of historical observations. Radiocarbon in sea water is a quasi-conservative water mass tracer and is incorporated into coral skeletal material, thus coral {sup 14}C records can be used to reconstruct changes in shallow …
Date:
February 23, 2001
Creator:
Kashgarian, M. & Guilderson, T. P.
Object Type:
Report
System:
The UNT Digital Library