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572
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Forces Between Nucleons And Antinucleons
Existing experimental information about the nucleon-anitnucleon interaction is reviewed, and a description is given of a theoretical model, based on the Yukawa theory, which seems able to explain the experimental results.
Date:
November 25, 1958
Creator:
Chew, Geoffrey F.
Object Type:
Report
System:
The UNT Digital Library
Bromine Exchange in Graphite-Bromine Lamellar Compounds
A kinetic study of the exchange of normal and radioactive bromine in graphite-bromine lamellar compounds has been made at temperatures of 30° to 50°C. Natural and synthetic graphite powders were investigated. Two alternative mechanisms for the exchange, volume diffusion and surface exchange, were considered. The data were in better agreement with the diffusion mechanism. Diffusion coefficients of 10 -9 to 10 -8 cm2/sec and an activation energy of 11 to 14 kcal/mole were calculated for the natural graphite powders. The diffusion coefficients increased with increasing bromine content. Reversibly absorbed bromine exchanged more rapidly than irreversibly absorbed bromine.
Date:
February 25, 1963
Creator:
Aronson, Seymour
Object Type:
Report
System:
The UNT Digital Library
Crystal Structure of a Sodium Cobalt Molybdate
The cobalt and molybdenum positions had been derived from a three-dimensional Patterson function based on complete data out to λ-1 sin θMo≈ 1. From the separation of the separation of the Mo atoms it was thought that the structure contained free, unlinked MoO4 -2 ions, and this, together with the observed density and analyses for Co and Mo, suggested that the composition was probably Co2(MoO4)3. The paucity of structural information on complex oxide systems and the interesting properties, both structural and physical, of such systems prompted the present, detailed refinement of the structure. The result is more complicated and more interesting than had been anticipated: from the analysis of the X-ray data the compound is found to be NaCo2.31(MoO4)3, and this composition is consistent with chemical analyses. The structure shows several interesting features, including the partial occupancy of cobalt atoms in two independent CoO6 octahedral sites. In one arrangement of CoO6 octahedra there is the not too common face sharing to form infinite columns; in the other arrangement a zig-zag sheet, as far as we know differing from anything thus far reported, is formed by the sharing of edges and corners.
Date:
February 25, 1963
Creator:
Ibers, James A. & Smith, G. W.
Object Type:
Report
System:
The UNT Digital Library
Electric Currents, Membranes, and Biological Sources of Electromotive Force
The analysis of closed circuit systems in which spontaneous steady-state electric currents appear can be carried out with the use of the function [function not transcribed]. The analysis indicates that any open circuit system of the form. Phase 1, barrier 1, phase 2, ......, phase b, barrier b, phase 1' is a chemical source of electromotive force when the phase 1 and 1' are identical, when the system contains two or more barriers whose sets of ionic transport members are different, and when the system is composed of two or more phases whose chemical properties are different. A general expression for the electromotive force of model systems composed of homogeneous phases and biological membranes in linear array can be written as [expression not transcribed] in which the indicated summations are to be performed for all barriers and for all ions to which each barrier is permeable.
Date:
February 25, 1963
Creator:
Nims, Leslie F.
Object Type:
Report
System:
The UNT Digital Library
Ultrasonic Testing With Lamb Waves
A method is described whereby many types of flaws lying close to the surface of a metal can be ultrasonically detected, regardless of the time duration of the interrogating pulses. Lamb waves are established in the metal between a flaw and the surface by an ultrasonic beam which impinges at the proper angle of incidence. A suitably positioned receiver transducer picks up the waves to reveal the flaw. In this method the usually troublesome surface echo is eliminated from the receiver by an acoustic barrier, making it well suited for routine and automatic testing. Results of applying the technique to several testing problems are discussed.
Date:
September 25, 1956
Creator:
Worlton, D. C.
Object Type:
Report
System:
The UNT Digital Library
Neutron Leakage Through Iron
Neutron attenuation in the old pile shields is dependent more and more on the slowing down characteristics of the iron as the hydrogen is baked out of the masonite. For neutrons above 1 or 2 Mev, iron does a good job by inelastic scattering. However, below this energy attenuation can be done only by the gradual moderation by elastic scattering to thermal energies with subsequent capture in the iron. Since iron is heavy and thus a poor moderator, there is a good possibility that many neutrons of intermediate energy will leak out of a burned out shield. Also, iron has a large dip in its cross section at 25 Kev which might allow a large burst of neutrons at this energy to leak out. Measurements using a lucite moderator with gold foil detectors indicate a large leakage of neutrons of intermediate energy, but interpretation of these measurements is difficult. These considerations prompted an attempt to get a rough idea of the energy distribution of the leakage neutrons through pure iron using a simple qualitative theory.
Date:
July 25, 1956
Creator:
Wood, D. E.
Object Type:
Report
System:
The UNT Digital Library
The Reactivity Value of Highly Burned Plutonium in Thermal Reactors
It has been suggested by many workers in the power reactor field that a more efficient utilization of natural uranium may be obtained in thermal reactors if the Pu produced in a fuel cycle were used to enrich a subsequent cycle in which the irradiation-depleted-uranium would be reirradiated. The work described here was done for the purpose of evaluating the reactivity value of the Pu enrichment under the assumption that all plutonium produced is, after chemical separation, fabricated into separate fuel elements and not alloyed with recycled uranium. It has been suggested that the reactivity value of the Pu decreases with exposure to such an extent that highly burned plutonium should be discarded. We, therefore, wish to look at two of the variables affecting the limiting exposure: the reactivity value of the fuel as a function of exposure and temperature and the fraction of potential fissions which would be discarded as a function of exposure. Though the residence time of the Pu fuel before reprocessing, refabrication, and recycling depends upon the relative decrease in specific power, decrease in reactivity due to fission product build-up, the lifetime of the fuel elements before failure, and the cost of reprocessing, only the first …
Date:
June 25, 1956
Creator:
Heineman, R. E. & Lefevre, H. W.
Object Type:
Report
System:
The UNT Digital Library
Thermal Expansion of Pile Graphites
Average coefficients of thermal expansion of the temperature range 25 C to approximately 425 C are reported for numerous types of graphite. The dependence of thermal expansion on crystal orientation and crystallite size and the effects of oxidation and cold test hole irradiation are discussed. An empirical relationship between thermal expansion and the initial rate of physical expansion under cold test hole irradiation is formulated.
Date:
May 25, 1956
Creator:
Riley, W. C. & Woodruff, E. M.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric Contamination Associated with Inert-Gas-Shielded, Consumable Electrode Welding
Apparent excessive concentrations of atmospheric contamination which were reported to be associated with an inert-gas-shielded consumable electrode arc wielding operation were studied to evaluate the potential health hazards. A study was made of the concentrations of metal fume and gaseous products of the operation as well as the spectrum of ultraviolet radiation. Recommendations for necessary controls were made.
Date:
July 25, 1955
Creator:
Adley, F. E. & Gill, W. E.
Object Type:
Report
System:
The UNT Digital Library
Texas Transportation Plan 2050
The TTP 2050 describes future planning and programming trends and issues, evaluates long-term investment priorities, identifies planned rural investments, presents implementation strategies, and consider s the performance implications of different investment strategies under potential future scenarios.
Date:
June 25, 2020
Creator:
Texas. Department of Transportation.
Object Type:
Report
System:
The Portal to Texas History
Foam Suppression of Radioactive Iodine and Particulates
" A reliable, efficient and economical method is needed to remove radioactive halogens such as iodine and bromine and particulates from air in many atomic energy installations. One method we have developed which is particularly suited to reactor containment vessels or other large confined areas is foam containment. In this method an ether lauryl sulfate foam containing an iodine reactant is generated, rapidly filling the entire containment volume. This provides a tremendous surface area to which the encapsulated gases and particles can diffuse and be removed."
Date:
February 25, 1964
Creator:
Yoder, Robert E.; Fontana, Mario H. & Silverman, Leslie
Object Type:
Report
System:
The UNT Digital Library
Change 53 to Update the Texas Rules for Credit Unions
Memorandum to all state chartered credit unions in Texas providing updates to The Texas Rules for Credit Unions with revised pages containing amendments and instructions for inserting the new pages into existing books.
Date:
March 25, 2019
Creator:
Texas. Credit Union Department.
Object Type:
Text
System:
The Portal to Texas History
Focus Report, Volume 86, Number 4, September 2019
Report including a digest of each vetoed measure, the governor's stated reason for the veto, and a response to the veto by the author or sponsor of the bill.
Date:
September 25, 2019
Creator:
Texas. Legislature. House of Representatives. Research Organization.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
A Final Report on the Experiment : the Penetration of Graphite of Different Purities by Lead Bismuth Eutectic
Bi-Pb eutectic and pure Bi penetration of graphites of various densities under 300 degrees C and pressures up to 20 psi was found be of the order of magnitude of 1.0 g/cm(2) and was uniform throughout the graphite. Bi was absorbed less than the eutectic but the oxidation rate of Bi would be prohibitive. There was heavy nitriding in N atmospheres with the Bi and the eutectic.
Date:
September 25, 1944
Creator:
Stroud, William G.
Object Type:
Report
System:
The UNT Digital Library
Eta Temperature Effect
The temperature coefficient of eta has been measured with the thermal column of the Argonne pile using uranium foils of different isotopic ratios. The temperature change was effected by filtering neutrons through silver. The measured fractional change per degree centigrade is [formula].
Date:
February 25, 1944
Creator:
Bragdon, E. W.; Hughes, D. & Marshall, John
Object Type:
Report
System:
The UNT Digital Library
Calculations for Some Pile Shapes of Which the Boundaries are Partly Spherical
Some methods for calculating the k requirements of various shaped piles are indicated, with particular reference to the shape of the tank in the homogeneous plant.
Date:
February 25, 1944
Creator:
Young, G.; Murray, F. H. & Castle, H.
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 46, Number 26, Pages 3771-3974, June 25, 2021
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:
June 25, 2021
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Deposition of Corrosion Products by Cataphoresis
This report is a record of experimentation conducted intermittently over a period of two years and directed toward preventing deposition of transport corrosion products on fuel elements and other critical components in high-temperature, circulating water nuclear reactor. It includes the postulated mechanism for deposition, a description of experimental equipment, experimental data, results obtained from the experiments, and recommendations for future study.
Date:
June 25, 1953
Creator:
Fagan, Walter
Object Type:
Report
System:
The UNT Digital Library
Refractive Indices of the Systems Uranium Hexafluoride-Bromine Trifluoride and Uranium Hexafluoride-Bromine Pentafluoride
A spectrometer has been used with a hollow prism electrically heated to 70 C to measure the refractive indices of solutions of uranium hexafluoride in bromine trifluoride and uranium hexafluoride in bromine pentafluoride. The refractive indices of the two binary systems have been expressed as a function of composition.
Date:
May 25, 1953
Creator:
Stein, Lawrence & Vogel, Richard C.
Object Type:
Report
System:
The UNT Digital Library
The Synthetic Liquid Fuel Potential of Texas
Report documenting the suitability of Texas for plant locations to produce synthetic liquid fuels, based on raw materials, water sources, and local interest.
Date:
January 25, 1952
Creator:
Ford, Bacon, and Davis
Object Type:
Report
System:
The UNT Digital Library
Calcium Oxalate Carrier Precipitation of Pu
This technical report describes a plant-scale procedure for concentrating plutonium and americium in slag and crucible (metal reduction residues) and other recovery solutions by a calcium oxalate carrier precipitation Conclusions from exploratory laboratory tests on the variables affecting the efficiency are included.
Date:
February 25, 1954
Creator:
Maraman, W. J.
Object Type:
Report
System:
The UNT Digital Library
A Modification of the Norelco Diffractometer for the Identification of Phases in Metallographic Specimens
A modification of the specimen support for the Norelco diffractometer permits X-ray diffraction studies to be made of specimens prepared for metallographic examination. The unit has been successfully used to identify phases present in specimens of plutonium-uranium alloys.
Date:
February 25, 1952
Creator:
Stambaugh, C. K. & Whyte, D. D.
Object Type:
Report
System:
The UNT Digital Library
The Polarographic Determination of Uranium in the Presence of Plutonium
Strubl's polarographic method for the determination of uranium in the presence of iron can be used for the determination of uranium in plutonium solutions. A hydroxylamine hydrochloride solution (2M) is used as the supporting electrolyte. This reduces the plutonium to the plus three oxidation state without reducing the uranium. The uranium may then be determined polarographically by measuring the height of the uranyl reduction wave (UVI to UV) at -0.35 volts (vs. S.C.E.) applied potential. Solutions with a U/Pu weight ratio as low as 3.5 x 10(-3) were analyzed with an error of less than 2%. This error increased to 6% for solutions of 1 x 10(-3) U/Pu ration and is considerably larger for smaller U/Pu ratios.
Date:
May 25, 1951
Creator:
Smith, Maynard E. (Maynard Elliott)
Object Type:
Report
System:
The UNT Digital Library
Plowshare Program : Peaceful Uses for Nuclear Explosives
The concept of thermonuclear explosives as a potentially cheap and almost inexhaustible energy source for mankind's non military needs has for several years been under active consideration at the Lawrence Radiation Laboratory. Many of the proposed peaceful applications involve underground nuclear explosions, and several experiments at the AEC Nevada Test Site have provided valuable insight into the phenomenology of such explosions. Among the possible uses currently under consideration are excavation, heat production, isotope production, mining, recovery of oil from shales and tar sands, improvements of ground water supplies, and the construction of earth fill dams. In addition a program of experimental research in the laboratory and in the field is under way. Sometime in 1961 Project Gnome if approved will be conducted in New Mexico. The purpose of Gnome, a contained nuclear explosion in a salt deposit, is to study the feasibility of heat recovery and isotope production, neutron scattering experiments will also be included. Other proposed nuclear projects will involve the creation of a small harbor near Cape Thompson, Alaska as the result of an experiment designed to investigate the cratering effects of nuclear explosives; a proposal to investigate the recovery of oil from Canadian tar sands using thermonuclear …
Date:
July 25, 1960
Creator:
Lombard, David B.
Object Type:
Report
System:
The UNT Digital Library