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Thorium Bismuthide : Ultrasonic Control of Crystal Size
Thorium bismuthide when crystallized from a solution i bismuth results in large platelets which may be as large a 1 centimeter in diameter. A slurry of these platelets is difficult to pump through pipe lines and filters. The particle size can be reduced by (1) very rapid cooing (approximately 1000 degree C per second) or (2) ultrasonic treatment. The latter, much easier to attain in large scale, gives equiaxed particles of thorium bismuthide.
Date:
March 16, 1959
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
RAYPAC : a Special-Purpose Analog Computer
As an aid in forecasting possible blast damage in areas distant from a bomb burst point, a special-purpose electronic analog computer has been developed. Sound ray paths (orthogonal trajectories to sound wave front) are computed as a function of meteorological conditions.
Date:
March 24, 1955
Creator:
Durham, H. B.
Object Type:
Report
System:
The UNT Digital Library
Higher harmonics of Radial Vibrations in Short Hollow Cylinders of Barium Titanate
This paper discusses the forbidden and allowed harmonics of a hollow cylinder of barium titanate vibrating in the radial mode.
Date:
March 9, 1955
Creator:
Stephenson, C.V.
Object Type:
Report
System:
The UNT Digital Library
A Study of the Mechanisms of Heat Treatment of Zirconium-Base Alloys : Status Report, July 1, 1955 - February 29, 1956
The kinetics of transformation of zirconium binary alloys is being pursued. Mechanical property variation as a function of transformation if also being investigated. Zirconium-tin and zirconium-titanium alloys transform very rapidly when quenched from the beta field. These alloys have, generally speaking, been demonstrated to be not amenable to heat treatment in the normal sense of the word. Eutectoid alloys, principally zirconium-molybdenum alloys, have shown a definite response to heat treatment in terms of mechanical property variation. An embrittling agent, probably "omega" phase, is suspect at this time for the brittleness observed in certain molybdenum alloys and the very high hardness levels reached in other alloys such as zirconium-niobium and zirconium-thorium. Work to establish the existence of omega phase is in progress and, it is hoped, suggestions for avoiding the brittle condition associated with it will be forthcoming.
Date:
March 15, 1956
Creator:
Domagala, R. F. & Levinson, David W.
Object Type:
Report
System:
The UNT Digital Library
Uranium Accumulation in Plants as an Indicator of Uranium Deposits in the Soil. Final Report
An alpha scintillation method for the analysis of uranium accumulation in plants as an indicator of uranium deposits in the soil was developed.
Date:
March 1, 1956
Creator:
Kurtz, Edwin B., Jr.
Object Type:
Report
System:
The UNT Digital Library
An Investigation of Scaling of Zirconium at Elevated Temperatures. Quarterly Status Report No. 11, December 2, 1955 to March 2, 1956
This technical report reports progress in the following areas: (1) Effect of scaling time; (2) Influence of specimen shape; (3) Effect of pretreatment; (4) Possible mechanism of growth; and (5) Future work.
Date:
March 13, 1956
Creator:
Barrett, C. A. & Evans, E. B.
Object Type:
Report
System:
The UNT Digital Library
Liquid Metal Level Instrument
Theory of operation and test results are given for a resistance type of liquid metal level instrument. The voltage across a steel rod in the tank is amplified by a magnetic amplifier and indicated by a milliammeter. Temperature compensation is provided for tank temperatures up to 1000 F.
Date:
March 18, 1952
Creator:
Robinson, H.; Dows, L. H. & Droms, C. R.
Object Type:
Report
System:
The UNT Digital Library
The Lindemann and Grüneisen Laws
The Lindemann assumption of direct contact of neighboring atoms at fusion is replaced by the criterion that melting occurs when the root-mean-square amplitude of thermal vibration reaches a critical fraction ρ, presumed the same for all isotropic monatomic solids, of the distance of separation of nearest-neighbor atoms. The Debye-Waller theory of the temperature dependence of the intensity of Bragg reflection of x-rays is used, without further assumptions, to derive a generalized Lindemann law. In contrast to the Lindemann form, all physical quantities involved in this formulation are evaluated at the fusion point, and departure of the average energy of an atomic oscillation from the equipartition value is taken into account by the quantization factor of the Debye-Waller theory. If the Grüneisen constant γm of the solid at fusion is evaluated by its definition from the Debye frequency of the solid, use of the generalized Lindemann law and Clapeyron's equation permits one to express γm in terms of the bulk modulus of the solid at melting and the latent heat and volume change of fusion. By means of Grüneisen's law applied to the solid at fusion, γm can be expressed likewise in terms of the corresponding bulk modulus, thermal expansion, volume, …
Date:
March 23, 1955
Creator:
Gilvarry, J. J. (John James), |1917-
Object Type:
Report
System:
The UNT Digital Library
Gas Plated Coatings on Metals and Alloys : Progress Report No. 1
The object of this project is to conduct studies on the coating of metals and alloys by the gas plating process. Coatings to be studied consist of chromium on copper; alloys of nickel chromium on copper; molybdenum on stainless steel and Inconel; chromium on stainless steel and Inconel; and tungsten and molybdenum and their carbides on stainless steel and Inconel.
Date:
March 11, 1953
Creator:
Nack, Herman & Whitacre, John R.
Object Type:
Report
System:
The UNT Digital Library
Utex Leaching, Thickening and Filtration Tests
A series of leaching, thickening, and filtration tests was undertaken to determine minimum conditions for high uranium extractions and to obtain thickening and filtration data.
Date:
March 15, 1954
Creator:
Stanley, Alan; George, D'Arcy R.; Thomas, Peter N.; Eisenhauer, Robert; Lynch, James T. & Richardson, Stanley
Object Type:
Report
System:
The UNT Digital Library
Preliminary Leaching Tests for the Extraction of Uranium From Various Monticello Stockpile Ores
In a section of the area occupied by the Atomic Energy Commission in Grand Junction, Colorado, a pilot plant is being erected to test a resin-in-pulp process. The process is based on the adsorption of uranium by resin from acid pulps. The first ores to be treated at this plant will be Monticello Stockpile Material. Samples of the various stockpiles sere subjected to a series of leaching, filtering and settling tests, the results of which are presented in this report.
Date:
March 2, 1953
Creator:
Abrams, Charles S.; Moulton, Harry D. & Viklund, Hans I.
Object Type:
Report
System:
The UNT Digital Library
Recovery of Manganese Dioxide From Rand Barren Solutions
In the course of recovering uranium from Rand cyanide residues, large volumes of barren acid liquors are produced. With the flowsheets now under consideration it is not advisable to recycle such liquors and they are to be discarded. Consideration was given to the removal of manganese under conditions that would permit its recovery as MnO2.
Date:
March 15, 1953
Creator:
Owens, Albert W.
Object Type:
Report
System:
The UNT Digital Library
High Pressure Pump Seal Development
"Test results indicated that graphite is not suitable for seal face material. A program to evaluate various materials and seal face geometries was initiated. A seal run using nucerite-bearium combination was carried on for six hours."
Date:
March 5, 1962
Creator:
Zanoni, P. J.
Object Type:
Report
System:
The UNT Digital Library
Contribution of Neutral Pions to Photon-Proton Scattering
"The correction to photon-photon scattering processes due to the existence of the particles other than electrons is reported. The correction is of the same order in the electric charge as the lowest order term in the perturbation expansion in quantum electrodynamics, although the relevant corrections to the electron-photon and electron-electron scattering are all of higher order."
Date:
March 16, 1961
Creator:
Han, M.Y. & Hatsukade, S.
Object Type:
Report
System:
The UNT Digital Library
Hamiltonian Dynamics of Relativistic Particles
"The canonical (hamiltonlan) formulation of a relativistic dynamical theory is outlined, and the existence and explicit construction of general hamiltonian theories of relativiatic interacting particles are discussed. These hamiltonian theories are shown to contain certain elements of arbitrariness which are eliminated in manifestly coveriant formulations."
Date:
March 2, 1961
Creator:
Sudarshan, E.C.G.
Object Type:
Report
System:
The UNT Digital Library
Stratospheric Monitoring Program
"Results of the continuing stratospheric flight test evaluation program for the Del Model I Electrostatic Precipitator Sampler and the Del Electrical Discharge Altimeter are described and discussed. Only one of four balloon launches reached floating altitude. The altimeter obtained an altitude recording consistent with concurrent aneroid barocoder readings. The reported gross gamma concentration for the precipitator sampler was approximates 25 and 80% higher than those of the two simultaneous direct flow filter samples. The completion of the design and construction of two prototype units of the Del Electrical Discharge Altimeter and their laboratory evaluation are described. A preliminary design concept is presented for an operational high volume electrostatic precipitator sampler to operate with high collection efficiency at an ambient flowrate of 500 cfm throughout the altitude range 100,000 to 150,000 ft."
Date:
March 15, 1963
Creator:
Cravitt, S.; Lilienfeld, P.; Foldes, A. & Lippmann, M.
Object Type:
Report
System:
The UNT Digital Library
Containment in Cusped Plasma Systems
"A survey of the current theoretical picture of plasma containment in cusped magnetic configurations is presented together with a mention of the points of contact which exist or might soon be made to exist with experiment. A theory of containment was developed which is applicable to the whole range of plasma densities from a tenuous plasma in an essentially vacuum magnetic field to a fully developed plasma which completely excludes the magnetic field from its interior. Also presented are cursory accounts of the situation with regard to stability, cyclotron radiation, and methods of creating this type of plasma configuration."
Date:
March 30, 1961
Creator:
Grad, Harold, 1923-
Object Type:
Report
System:
The UNT Digital Library
Alternating Direction and Semi-Explicit Difference Methods for Parabolic Partial Differential Equations
"The energy method is applied to study the stability of two types of difference approximations to parabolic partial differential equations, the alternating direction methods Douglas, Peaceman, and Rachford, and a new semi- explicit method. Each difference scheme is proved to be unconditionally stable. These results apply to parabolic equations with variable coefficients, defined in cylindrical domains with an essentially arbitrary bounded base."
Date:
March 1, 1961
Creator:
Lees, Milton
Object Type:
Report
System:
The UNT Digital Library
Sherwood progress report no. 4, July 1959 - December 1960
"Activities related to Project Sherwood are summarized under the following topics: propagation of waves, macroscopic magneto-fluid dynamics, stability, particle orbits, cusped geometries, collisionless shock theory, and other subjects."
Date:
March 1, 1961
Creator:
Grad, Harold, 1923-
Object Type:
Report
System:
The UNT Digital Library
The Effect of Temperature on the Width of a Small-Amplitude, Solitary Wave in a Collision-Free Plasma
"Adlam and Allen and Davis, Lust, and Schluter have studied nonlinear plane-waves, propagating normal to the magnetic field, in a cold plasma. One solution of particular interest is a solitary wave, or single pulse. We present a method for solving the analogous problem for a plasma with finite temperature, in the limiting case where the amplitude of the wave is small and where, consequently, the width of the waver is very large."
Date:
March 15, 1961
Creator:
Gardner, Clifford S.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Track Image Intensifier
"Design and fabrication techniques were improved so that the large area image intensifier now performs well in image intensifier systems for photographing nuclear tracks. Two successful samples meeting most of the objectives were completed and started in circulation among members of the AEC Image Intensifier Committee for evaluation in systems to record nuclear tracks. Except for a reported long decay in the P-15 phosphor performance was quite good. Resolution, gain, and background requirements were met. Magnification was still high (1/6.5 compared to a design objective of 1/8) but can be lowered to 1/8 by a straightforward mechanical change. Evaporated layers of thallium activated rubidium and cesium iodide were improved and further evaluated. Improved control of color and persistence was obtained. Efficiency as high as 1/3 that of P-11 phosphor was obtained in some samples. The current test series confirmed earlier results that an increase in cesium iodide content shifts the emission spectrum towards the yellow. Burn-resistance and light output was poorer for the cesium enriched phosphors while decay time was decreased.
Date:
March 30, 1961
Creator:
DesRochers, R. D. & Stern, H. A.
Object Type:
Report
System:
The UNT Digital Library
Bimetallic Casting
"The purposes of the program being conducted under the present contract are: 1) To determine the feasibility of cladding zirconium on uranium by a direct casting process. 2) To investigate the diffusion of liquid metals in the fusion zone."
Date:
March 29, 1961
Creator:
Krashes, David
Object Type:
Report
System:
The UNT Digital Library
On Certain Finite Difference Schemes for the Equations of Hydrodynammics
"We will consider two finite difference schemes for the solution of the Navier-Stokes equations in one space dimension. The first is a method used by Lax and Wendroff. The second method is based on an approximate solution of the centered, implicit difference equations. Since this approximate solution is obtained by successive substitutions, we will refer to this second method as an iterative method."
Date:
March 1, 1962
Creator:
Gary, John William
Object Type:
Report
System:
The UNT Digital Library
The U + 4 - U02 ++ Couple in H2SO , and the U + S - u + 4 Couple in HCl
Technical report: Measurements have been made on the equilibrium between Cu, Cu2+, U4+, and UO22+ in H2SO4 in an attempt to establish the value of the U4+ - UO22+ couple potential. The value of the formal potential for the U3+ - U4+ couple in 1N HCl at 0 degrees C was determined to be + 0.65 v.
Date:
March 19, 1946
Creator:
Cubicciotti, D.
Object Type:
Report
System:
The UNT Digital Library