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6,027 Matching Results
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Utilization of the Surface Tension of Liquid Metals in Making High-Vacuum Seals
Abstract: "The free energy (surface tension) of a liquid film can withstand atmospheric pressure across a maximum theoretical gap of 10-(-3) cm between solids if the liquid wets and bridges the sides of the gap continuously. The eutectic alloy of Ga, lm and Sm is used for this purpose. This alloy is molten at room temperature with surface tension > 500 dynes/cm, vapor pressure < 10-(-8) cm at 500 C and excellent wetting properties. This alloy can be utilized in valves, motion seals, flanged joints and for electrical contacts mounted in any position. Using ultrasonic soldering techniques without heat or flux this alloy is readily wetted on W, Mo, Ta, pyrex, quartz and certain ceramics. These materials will withstand the corrosive action of this alloy at at least 400 C. Some de-wetting has been observed with only the nonmetals at high temperatures. This de-wetting may be due to thermal decomposition of gallium oxide. Stainless steel is easily wetted, but is attacked at temperatures above 300 C. Copper and brass are attacked at room temperature."
Date:
August 30, 1957
Creator:
Milleron, Norman
System:
The UNT Digital Library
V. Multiplying Lattices of the Hollow Type
A two-group approximation of the fission ratios and Pu production in an infinite hollow matrix is developed
Date:
February 14, 1951
Creator:
Brown, Harold
System:
The UNT Digital Library
Vacuum Arc Melting : a Bibliography
This partially annotated bibliography contains 334 references from papers published from 1945 to 1959 and includes references on the consumable - and nonconsumable - electrode vacuum arc melting process. References are also given on electrode preparation, furnace construction and operation, melting, sintering, vacuum techniques, and theory.
Date:
March 16, 1960
Creator:
Cernak, Elizabeth A.; Doyle, J. & Aconsky, S.
System:
The UNT Digital Library
Vacuum Probe, Standard Leaks, and Needle Valve for Use with the Helium Leak Detector
The following report is split into four parts describing the usage of a vacuum probe for leak hunting with the Helium Leak Detector, the two types of Standard Leaks that were designed to measure the sensitivity of the detector, the development of a needle valve adjusted for controlling the flow of a standard mixture of helium and air into the leak detector for a sensitivity check by the single leak method, and a worm and gear adjustment developed to facilitate throttling of the Helium Leak Detector on a vacuum header equipped with the 3/8" Kerotect angle valve.
Date:
August 1945
Creator:
Samuel, A. J.
System:
The UNT Digital Library
The Validity of the Statistical Theory of Pressure Broadening
The statistical theory of pressure broadening is developed for any interaction law in which the potential energy is inversely proportional to some power of the distance between the molecules, including cases in which the forces change sign. This note is intended to prove two propositions: A. When a spectral line is broadened by single impacts of perturbing molecules and the half-width of the line is delta infinity, the statistical theory of broadening is applicable provided delta infinity . R >> 1. In this criterion T is a time comparable to the interval in which the perturbed traverses a distance equal to the impact parameter. B. Far in the wings of a line the statistical theory is always applicable.
Date:
April 3, 1956
Creator:
Margenau, Henry, 1901-1997
System:
The UNT Digital Library
The Value of Nu for Fission of U²³³ by 14 Mev Neutrons as Derived from Charge Distribution Measurements
Abstract: "The charge distribution for fragments from fission of U-235 induced by 14 Mev neutrons, as given by Ford, has been examined to obtain the average number of neutrons per fission. On the basis of some assumptions which seem reasonable a value NU-5.2 +/- 0.5 is obtained. Some evidence is also given which points toward the validity of the Glendenin hypothesis of charge distribution as opposed to that of Present."
Date:
1958
Creator:
Wahl, John S.
System:
The UNT Digital Library
Values of Resonance Integrals
The following report provides value tables of resonance intervals for various elements and materials.
Date:
April 30, 1952
Creator:
Wilson, E. S.
System:
The UNT Digital Library
The Valve Actuated Pulse Column Design
Abstract: "The valve-actuated pulse column is employed to give phase separation on each half cycle in the countercurrent flow cycle and provides independent control over each step in the cycle. The dependence on temperature of operation, on pulse frequency and amplitude, and on plate design and spacing has been studied for extraction and stripping of uranium with tributyl phosphate in a hydrocarbon diluent. It is found that the efficiency increases quite significantly as the temperature is raised regardless of the direction of transfer and this increased efficiency is accompanied by greater operational freedom. A decrease in hole size, decrease in plate separation and increase in frequency all lead to higher efficiency in agreement with the concept that small drops continually formed coalesced and reformed, lead to maximum interphase transfer. The high extraction efficiency of the column is probably aided further by the relatively sharp pulse produced."
Date:
February 16, 1953
Creator:
Burger, L. L. & Clark, L. H.
System:
The UNT Digital Library
The Valve-Actuated Pulse Column Design and Operation
The following report describes a countercurrent extraction column, which employs timed solenoid valves and pressurized feeds to provide a pulsing action to disperse the phases. This report further describes the 4-stage cycle of the column operation.
Date:
December 3, 1951
Creator:
Burger, L. L.
System:
The UNT Digital Library
Vanadium Salt Roasting Studies
The test work showed that three variables were important in obtaining good vanadium extractions. These variables were 1) the concentration of salt, 2) the roasting time, and 3) the temperature. In general, eight percent salt, 850'C, and 45 minutes roasting time are the optimum conditions for vanadium extraction by salt roasting methods.
Date:
unknown
Creator:
Stanley, Alan
System:
The UNT Digital Library
The Vanadium-Uranium Constitutional Diagram
Abstract: "Vanadium-uranium equilibrium studies were made on alloys prepared from high-purity vanadium and good biscuit uranium. No intermetallic phases occur in the system. Additions of vanadium lover the uranium melting point and transformations producing a eutectic at 1240 +/- 5 C and eutectoid reactions at 727 +/- 5 and 652 +/- 5 C. The maximum solubility of uranium in vanadium is about 4 atomic per cent (15 weight per cent)."
Date:
December 15, 1951
Creator:
Saller, Henry A. & Rough, Frank A.
System:
The UNT Digital Library
Vapor and Liquid Phase Reactions Between Nitrogen Dioxide and Water
Knowledge of the mechanisms involved in the aqueous absorption of nitrogen oxides is limited, and no definite evidence has been available to indicate if the major chemical reactions involved occur in the gas phase or in the liquid phase. This work was undertaken to determine in which phases the chemical reactions occur and to obtain additional information on the over-all mechanism of the removal process. The results of this investigation show that the rate of absorption of nitrogen oxides decreases significantly as the operating temperature is increased. The major portion of the chemical reactions occurs in the liquid film and the gas film, with an appreciable amount of the reactions occurring in each.
Date:
1954
Creator:
Peters, Max S., 1920-2011 & Holman, J. L. (James L.)
System:
The UNT Digital Library
Vapor-Deposited Zirconium on Uranium
From introduction: "This report describes the second phase of the work on the application of protective coatings to uranium by vapor deposition to reduce or prevent its corrosion by water."
Date:
July 20, 1955
Creator:
Powell, Carroll F.; Jones, Robert P.; Girod, Fleet T. & Campbell, Ivor E.
System:
The UNT Digital Library
Vapor-Liquid Equilibria of Methanol-Carbon Tetrachloride in Solutions of Low Methanol Concentration
The vapor-liquid equilibria of solutions 0.0002 to 1.0 mole fraction methanol in carbon tetrachloride at 10, 20, 30, 40 and 50°C have been examined. The equilibrium vapor and liquid compositions and the total pressure above these solutions at the five temperatures are reported. The "pure" vapor pressure of methanol, [unable to transcribe] (a function calculated from the quotient Pa/Na of partial pressure of methanol Pa and mole fractions of methanol in the liquid Na), and the calculated values of the heat of vaporization of methanol both conclusively indicate that in solutions more dilute than 0.001 mole fraction methanol there still exists strong intermolecular attraction. This interaction is attributed to the existence of methanol dimers. A value of 7.6 to 11.2 kcal/mole is estimated for the dissociation of the dimer; this is the energy of the hydrogen bond if there is one hydrogen bond per dimer, and if there are two hydrogen bonds per dimer the energy of the bond is one-half this value.
Date:
unknown
Creator:
Sancier, Kenneth M.
System:
The UNT Digital Library
The Vapor Phase Hydrolysis of the Trichlorides of Lanthanum, Praseodymium, Samarium, and Americium
The following report studies the reactions of vapor phase hydrolysis of the trichlorides of lanthanum, praseodymium, samarium, and americium with gas mixtures of HCl and H2O passing over the solid materials mounted on a cantilever-type quartz fiber microbalance. This report calculates the values of the heats and entropies of the reactions, as well as the heat formation of LaCl3, 1254.9 kcal mol-(-1) that was obtained by determining the heat of the solution of La metal in 1.5M HCl.
Date:
1943
Creator:
Broido, Abraham
System:
The UNT Digital Library
The Vapor Pressure of Beryllium Fluoride
Abstract: "Vapor pressures of BeF2 were measured over the temperature range of 746-968 using the transpiration method. The extrapolated boiling point is shown to be 1159[degrees]. The melting point is about 803[degrees]."
Date:
1953
Creator:
Sense, K. A.; Snyder, M. J. & Clegg, J. W.
System:
The UNT Digital Library
Vapor Pressures of Isotopic Molecules
It is apparent that major progress has been made both in the experimental and theoretical study of the vapor pressures of isotopic molecules in the last five years. Vapor pressure measurements are being made in different laboratories by different methods which agree with one another within a few hundredths of one percent. The theory has advanced to the point where a large body o experimental data can be systematized and understood. Quantitative calculations have been carried out which verify the mass, temperature, and potential energy dependence aspects of the theory. An old subject has been revived by advances in modern experimental and theoretical methods and is now useful for the study of quantum effects and structural effects in liquids and solids.
Date:
1962
Creator:
Bigeleisen, Jacob
System:
The UNT Digital Library
The Vapor Pressures of VCl2, VCl3, VBr2, and VBr3 by Knudsen Effusion
Technical report. From Abstract : "The vapor pressures of crystalline VCl2, VBr2, VCl3 and VBr3 have been measured by the Knudsen effusion method using pyrex and Vycor effusion cells. ... During the measurements on VCl3 and VBr3 dissociation and disproportionation of the samples occurred simultaneously with the simple vaporization. However, because the product of each of these processes was collected separately during an experiment, the vapor pressure due to sublimation was obtained without difficulty."
Date:
August 21, 1962
Creator:
McCarley, R. E. & Roddy, J. W.
System:
The UNT Digital Library
Vapor Traps for Handling Liquid Sodium
An active program is a present underway to develop equipment to handle liquid metals. Among the metals being studied are sodium and sodium--potassium alloy (the latter commonly referred to as NaK). In many of the systems being studied this liquid metal is pressurized by inert gas in the lines. At times it is necessary to bleed off some of this gas from the system. Although the gas is allowed to escape at a temperature at which the vapor pressure of sodium is extremely small, it has been found that excessive amounts of sodium are present in this gas stream. Either this sodium collects in the lead-off pipes from the system as a solid, threatening to block the passage in which it is found, or it passes out into the atmosphere. In order to explain the presence of such a dangerous concentration of sodium in the exit gas stream, it has been proposed that the sodium vapor present in the the system at high temperatures condenses into a mist or aerosol on cooling. This aerosol is stable and will not readily de-entrain or condense onto the surfaces over which it passes. Another possibility is that the oxygen present with the inert …
Date:
August 25, 1951
Creator:
Erickson, A. J.; Gregory, C. L. & Lang, P. M.
System:
The UNT Digital Library
Vaporization Experiments with Polonium
Vaporization studies were made with Po on Au, Pt and Pd supports. It was shown that Po is vaporized at a much higher temperature than from Au and Pt.
Date:
January 6, 1944
Creator:
Rona, Elizabeth
System:
The UNT Digital Library
Vaporization Investigations in Vacuum on Polonium, Radium D and Radium E
Investigations on the case of vaporization of RaD, E, and F in a vacuum were conducted.
Date:
January 6, 1944
Creator:
Hoffer, Margarette
System:
The UNT Digital Library
Vaporization Processes in a Runaway Reactor
From the point of view of constituents of a fuel element at temperatures between 2500 and 4500 degree K, the fuel elements can be considered to consist of six types of material: carbon, elements less volatile than carbon, 26 moles of rare gases, 21 moles of alkali metals, 17 moles of alkaline earth metals, and 4 moles of miscellaneous volatile elements. Various processes involving the constituents from 2000 to 45000 degree K are considered. Reactivity gain due to can rupture is discussed.
Date:
August 4, 1959
Creator:
Brewer, Leo, 1919-2005
System:
The UNT Digital Library
Vaporization reactions of vanadium(III) bromide : Dissociation and Disproportionation Equilibria, and the Formation of Vanadium (IV) Bromide
Technical report. From Abstract : "The equilibria (1) VBr3(s) = VBr2(s) + 1/2Br2(g) and (2) 2VBr3(s) = VBr2(s) + VBr4(g) were studied over the range 644 to 805°K by transpiration in helium."
Date:
August 21, 1962
Creator:
McCarley, Robert E. & Roddy, James W.
System:
The UNT Digital Library
VARI-II
Writing the VARI-II Program was motivated by the need for a method of analyzing the results for the Absorber Burn-Up Experiment in progress at the Vallecitos Atomic Laboratory.
Date:
March 10, 1961
Creator:
Russell, J. L. (John L.), Jr.
System:
The UNT Digital Library