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35,901 Matching Results
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Removal of Radioisotopes From Solution by Earth Materials From Eastern Idaho
None
Date:
January 1, 0196
Creator:
Wilding, M. W. & Rhodes, D. W.
System:
The UNT Digital Library
O. Henry
Biography and literary analysis of O. Henry's life and works.
Date:
January 1917
Creator:
Van Doren, Carl, 1885-1950
System:
The Portal to Texas History
O. Henry's Pen Name
Letter entitled, "O. Henry’s Pen Name," on the possible origin of his pseudonym.
Date:
January 9, 1937
Creator:
Boissard, George A.
System:
The Portal to Texas History
The University of Texas Health Program ...A Statement by the Vice-President In Charge of Medical Education
A statement by Dr. Chauncey D. Leake on the University of Texas Health Program, reprinted as a booklet from the Spring 1943 edition of Texas Reports on Biology and Medicine. Leake discusses civil responsibility for public health, efforts to treat cancer and mental illnesses, hygiene, the U. of Texas Medical Branch's research and services, pediatrics, and geriatrics.
Date:
January 1, 1943
Creator:
Leake, Chauncey Depew, 1896-1978
System:
The Portal to Texas History
Production of Mesons by the 184-inch Berkeley Cyclotron
The authors have observed tracks which they believe to be due to mesons in photographic plates placed near a target bombarded by 380 Mev alpha particles. For a 10-minute exposure in the cyclotron, about 50 meson tracks are found along the 3-inch edge of a photographic plate. The mass has been determined by measuring the bending in the magnetic field and the range in emulsion. From the first 50 meson tracks measured they find a mass of 313 {+-} 16 electron masses. It is highly probable that these mesons are the heavy mesons described by Lattes, Occhialini, and Powell.
Date:
January 1, 1948
Creator:
Gardner, Eugene & Lattes, C. M. G.
System:
The UNT Digital Library
Stars in Photographic Emulsions Initiated by Deuterons Part II. Theoretical
The theory of high energy nuclear stars depends on a theory of nuclear transparency and on a theory of nuclear evaporation. The transparency can be computed on the basis of a model proposed by R. Serber as soon as the interactions between the nucleons and the incident particle are known. The evaporation can be computed on the basis of the statistical model of the nucleus as soon as the nuclear entropy and binding energies of the evaporated particles are known. The calculations have been formulated with approximate values for the above interactions, entropies, and binding energies; and by means of various mathematical methods: a method of averages, a method of reaction integrals, and one using diffusion equations. Probability distributions have been obtained for the number of prongs per star, and distributions are being computed for the energy and angle of a prong. The results are in qualitative agreement with the observations on photographic emulsions described in Part I.
Date:
January 1, 1948
Creator:
Horning, Wendell & Baumhoff, L.
System:
The UNT Digital Library
Nuclear Reactions of Arsenic with 190 Mev Deuterons
Isotopes formed in the bombardment of {sub 33}As{sup 75} with 190 Mev deuterons range in atomic number up to 24 (or more) mass units lighter than As{sup 75}. Identification of these isotopes was based on chemical behavior and half-life determination. Relative yields have been calculated and show that 80% of the observed reactions produce isotopes within 8 mass units of As{sup 75}. Three new isotopes have been observed: 9.5 d. Se{sup 72} (K), 44 m, Se{sup 71} ({beta}{sup +}), and 52 m, As{sup 71} ({beta}{sup +}).
Date:
January 21, 1948
Creator:
Hopkins Jr, H.H. & Cunningham, B.B.
System:
The UNT Digital Library
The Distribution of Radioactivity in the Mouse Following Administration of Dibenzanthracene Labeled in the 9 and 10 Positions with Carbon Fourteen
Dibenzanthracene, labeled in the 9 and 10 positions with carbon fourteen has been administered to mice intravenously and by stomach tube as an aqueous colloid, and intraperitoneally, subcutaneously, and by stomach tube in tricaprylin solution. The distribution of radioactivity in the mice at various time intervals after administration of the carcinogen has been determined. The radioactivity is rapidly eliminated, largely through the feces, and ordinarily very little is absorbed. The distribution and rate of elimination depends upon the mode of administration. There is an appreciable quantity of radioactivity in tumors produced several months after a single subcutaneous injection of dibenzanthracene. There appear to be no detectable effects from the radiation of the labeled carcinogen.
Date:
January 30, 1948
Creator:
Heidelberger, Charles & Jones, Hardin, B.
System:
The UNT Digital Library
Safety— Hot Potato!
Editorial article reprinted from Aero Digest discussing the responsibility for safety in the aviation industry.
Date:
January 1949
Creator:
Lederer, Jerome
System:
The Portal to Texas History
Meeting XI Bevatron Research Conference
It will be desirable to have a general purpose bending magnet available for use with the Bevatron. The design discussed, while tentative, is believed to incorporate most of the desired properties for use with the external beam.
Date:
January 12, 1954
Creator:
Wenzel, William A.
System:
The UNT Digital Library
Guides to Inventory Policy: I. Functions and Lot Size
Article reprinted from The Harvard Business Review discussing methods of inventory control and production planning.
Date:
1956-01/1956-02
Creator:
Magee, John F.
System:
The Portal to Texas History
SPECIAL HEAT TRANSFER PHENOMENA FOR SUPERCRITICAL FLUIDS
Present-day knowledge concerning the molecular structure of supercritical fluids is briefly reviewed. It is shown that liquid-like and gas-like phases may coexist at supercritical pressures, although they may not be in equllibrium with each other. it is postulated that on the basis of the coexistence of these two phases a "boiling-like" phenomenon may provide the mechanism of heat transfer to supercritical fluids at high heat fluxes and certain other conditions. An unusual mode of heat transfer was actually observed at supercritical pressures during tests which produced the high heat fluxes and other conditions under which such "boiling" would be expected. The tests and the various conditions are briefly described. An emission of high-frequeney, high-intensity sounds usually accompanied these tests. It is shown that similar screaming sounds were heard during boiling at subcritical pressures, giving further support to the hypothesis that "boiling" may occur at supercritical pressures. A seeond possible explanation for the unusual mode of heat transfer is based on boundarylayer stability considerations. At high heat fluxes large density differences exist between the bulk of the fluid and the fluid in the boundary layer near the wall. A breakdown of the boundary layer may be caused by the build-up of …
Date:
January 1, 1956
Creator:
Goldmann, K
System:
The UNT Digital Library
Determination of Hafnium and Rare Earths in Aluminum Alloys
Procedures are described for both a titrimetric and a gravimetric determination of hafnium in aluminum -hafnium alloys. The gravimetric procedure is used if the hafnium is to be recovered; otherwise, the titrimetric procedure is preferred. The sample is dissolved in aqua regia. Any undissolved hafnium is taken into solution via pyrosulfate fusion. The hafnium is separated from the aluminum and contaminants in the aluminum by precipitation as the mandelate. In the gravimetric procedure the hafnium mandelate is heated to the oxide, then weighed. In the titrimetric procedure the mandelate is destroyed with nitric, sulfuric, and perchloric acids. The hafuium then is determined by adding a measured excess of EDTA and back titrating the excess EDTA with a standard bismuth solution to a xylenol orange end point. (auth)
Date:
January 1, 1959
Creator:
Sikes, J. H.; Wade, M. A. & Yamamura, S. S.
System:
The UNT Digital Library
The Plutonium-Copper Phase Diagram
The constitution of the plutonium-copper binary alloy as determined by differential thermal analysis is presented. The system is characterized by two congruent melting compounds, PuCu2 (m.p. 865 degrees C.) and Pu4Cu17 (m.p. 954 degrees C.); two incongruent melting compounds, PuCu4 (m.p. 906 degrees C.) and Pu2Cu11 (m.p. 926 degrees C.); three eutectics, 96 atom per cent copper (m.p. 626 degrees), 70.5 atom per cent copper (m.p. 849 degrees C.), and 91 atom per cent copper (m.p. 881 degrees C.); and two peritectics at 75 atom per cent (m.p. 906 degrees C.) and 85.5 atom per cent (m.p. 926 degrees C.). Solid solution was found above 97 atom per cent plutonium. The apparatus, the method of investigation, and the binary alloy phase diagram is discussed.
Date:
January 1, 1960
Creator:
Rhinehammer, T. B.; Etter, D. E. & Jones, L. V.
System:
The UNT Digital Library
EXCHANGE INTERACTION BETWEEN CONDUCTION ELECTRONS AND MAGNETIC SHELL ELECTRONS IN RARE-EARTH METALS
The interaction Hamiltonian for the Coulomb exchange effect between conduction electrons and magnetic-shell electrons in rare-earth metals was derived from first principles. The approximations under which the interaction can be represented by the product of electron and ion spin vectors are exhibited. (auth)
Date:
January 15, 1961
Creator:
Liu, S. H.
System:
The UNT Digital Library
Development and Evaluation of Large Volume Scintillation Detectors and Their Application to Radioisotope Process Control
Large-volume scintillation detectors are being developed for radioisotope control of unit processes. In the development work, mirror-finished aluminum foil reflectors were better than diffuse reflectors, argon flushing to remove dissolved oxygen from liquid scintillators improves the pulse amplitude, and liquid scintillators are superior to plastics. Dimethyl POPOP was found to be an excellent primary solute; optimum concentration is 2.5 g/l in toluene with argon flushing and no secondary solute. A test loop was constructed for testing the detectors in process control applications. Among the systems being tested are one using a solid-state magnetic comparator-control relay and an inexpensive solenoid valve as the final control element, at approximates 25% of the cost of a conventional system. (D. L.C.)
Date:
January 1, 1962
Creator:
Perry, J. K.
System:
The UNT Digital Library
Direct and Absolute Measurement of Average Yield of Neutrons From Thermal Fission of U$sup 23$$sup 5$
None
Date:
January 1, 1962
Creator:
De Volpi, A. & Porges, K.
System:
The UNT Digital Library
The Effect of Ionizing Radiation on the Optical and Electrical Properties of the Alkali Halides
Various mechanisms for the formation of point defects in ionic crystals are considered. Their probable importance as a function of the energy of the ionizing radiation and the temperature at which the irradiation takes place is discussed. Complex centers formed from aggregates of simple point defects are reviewed and their occurrence considered in terms of the expected spatial distribution of the point defects. The effect of high energy x rays and protons on the ionic conductivity is discussed in terms of a new interpretation of the conductivity curve as a function of temperature, and it is suggested that radiation-enhanced diffusion may be important in explaining the experimental data. (auth)
Date:
January 1, 1962
Creator:
Royce, B S.H.
System:
The UNT Digital Library
FACTORS IN RADIOGRAPHY AT ENERGIES BELOW 400 kvp
From 1963 American Society of Metals/Metals and Materials Show, Cleveland, Oct. 1963. 23rd National Convention of the Society for Nondestructive Testing. The factors which affect the attainment of optimum results in radiography are radiation source, specimen, filmscreen combination, film processing, and their mutual relationships. A general review is presented of radiographic practice and the effects of variations in the factors, at energies below 400 kvp, on radiographic contrast and sensitivity. (D.L.C.)
Date:
January 1, 1962
Creator:
McClung, R W
System:
The UNT Digital Library
A High-Speed Readout for Multi-Channel Pulse-Height Analyzers
From American Nuclear Society Meeting, New York, Nov. 1963. In computer-coupled automated activation analysis such as in the Mark II system, conventional methods of data readout impose a serious restriction on the minimum handling time per sample. A data coupler for operating between the data accumulation system and the computer tape unit was developed which contributes nothing to the handling time per sample, does not distort the data, and prepares the data for direct computer entry. In addition to activation analysis, the coupler may be used to obtain successive spectra separated in time by 0.16 sec in the study of short-lived isotopes. (D.L.C.)
Date:
January 1, 1962
Creator:
Wilkins, W. W.; Fite, L. E. & Wainerdi, R. E.
System:
The UNT Digital Library
New Hot Laboratory Facilities at Los Alamos
New Hot Laboratory Facilities which support three major research programs directed by the Los Alamos Scientific Laboratory of the University of California are described. For the Nuclear Rocket Propulsion Program, a hot cell addition to the Radio Chemistry Building at Los Alamos will be completed early in 1963, and construction is expected to start soon on the hot cell addition to the Maintenance, Assembly and Disassembly Building at the Nuclear Rocket Development Station in Nevada. Integral hot laboratories are designed in the facilities for the Ultra High Temperature Reactor Experiment and the Fast Reactor Core Test at Los Alamos. (auth)
Date:
January 1, 1962
Creator:
Wherritt, Charles R.; Franke, Paul R.; Field, R. E. & Lyle, A. R.
System:
The UNT Digital Library
REACTIVE COLLISIONS IN CROSSED MOLECULAR BEAMS
The distribution of velocity vectors of reaction products is discussed with emphasis on the restrictions imposed by the conservation laws. The recoil velocity that carries the products away from the center of mass shows how the energy of reaction is divided between internal excitation and translation. Similarly, the angular distributions, as viewed from the center of mass, reflect the partitioning of the total angular momentum between angular momenta of individual molecules and orbital angular momentum associated with their relative motion. Crossed-beam studies of several reactions of the type M + RI yields R + MI are described, where M = K, Rb, Cs, and R = CH/sub 3/, C/sub 3/H/sub 5/, etc. The results show that most of the energy of reaction goes into internal excitation of the products and that the angular distribution is quite anisotropic, with most of the MI recoiling backward (and R forward) with respect to the incoming K beam. (auth)
Date:
January 1, 1962
Creator:
Herschbach, D.R.
System:
The UNT Digital Library
SCATTERING OF A VELOCITY SELECTED POTASSIUM BEAM BY NEON, ARGON, AND XENON GASES AT DIFFERENT TEMPERATURES
A thermal K beam was velocity selected, and scattered by Ne, Ar, and Xe gases. The dependence of the total cross section on relative velocity is approximately v/sup -0.4/ for K--Ar and K--Xe, and v/sup 0.8/ for K--Ne. The average relative velocity ranges were 400 to 1430 m/sec for Ne, 480 to 1350 m/sec for Ar, and 380 to 1320 m/sec for Xe. The dependence of the cross section on relative velocity was obtained by removing the cross section from the collision frequency integral. For the v/sup -0.4/ dependences, this gives results correct to 3%. For the v/sup -0.8/ dependences, the error is most likely greater. Three gas temperatures were used: liquid air, room, and 200 deg C. The results for a given gas at different temperatures are consistent with kinetic theory predictions. (auth)
Date:
January 1, 1962
Creator:
Brown, Jr, H H; Lulla, K & Bederson, B
System:
The UNT Digital Library
Automatic Exit Steam Quality Control for Boiling Water Reactors
From American Nuclear Society Meeting, New York, Nov. 1963. The need for control of the flow distribution and/or steam quality in boiling reactors is discussed. A quality control device is being developed which consists of an entrance venturi and an exit venturi for measuring the flow rates into and out of the channel, means for comparing the two flow rate signals, and a value for regulating the flow rate. This device can be used either as a constantquality device or as a controlled-quality device. Results are given of air-water studies of two-phase flow in a vertical venturi. (D.L.C.)
Date:
January 1, 1963
Creator:
Gall, D. A. & Doyle, E. F.
System:
The UNT Digital Library