91 Matching Results

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Wire Chamber-Computer System

Description: No Description Available.
Date: January 1, 1963
Creator: Bounin, J.; Miller, R.; Neumann, M.; Sarma, J. & Sherrard, H.
Partner: UNT Libraries Government Documents Department

Nuclear Performance of Large Pressurized Water Reactors Controlled by Soluble Poison

Description: The performance of large pressurized-water reactors operated with a uniformly distributed control technique such as a soluble neutron poison (boric acid) dissolved in the moderator is investigated. The cycling studies are performed in one dimension. (C.E.S.)
Date: September 1, 1963
Creator: French, R. J. & Miller, D. L.
Partner: UNT Libraries Government Documents Department

NEUTRON EXPERIMENTS WITH A TANDEM ACCELERATOR

Description: l963. The Wisconsin tandem accelerator is used part of the time for experiments in neutron physics. In these experiments the properties of neutrons from charged-particle reactions as well as the interaction of neutrons with nuclei are studied. Some of the techniques used and some of the results obtained are described. (auth)
Date: January 1, 1963
Creator: Barschall, H H
Partner: UNT Libraries Government Documents Department

Radiobiological Basis for the Whole Body Radiation Syndrome

Description: Data are presented that show a marked species difference in the degree of damage and in the course of events seen in the bone marrow and peripheral blood after a given dose of radiation. The data taken together indicate strongly, but do not prove, that the picture seen results primarily from damage to the stem cell population. This damage to the stem cells is manifested later in the more mature differentiating cells of the marrow, and in the peripheral blood. The picture seen results both from death of stem cells, and also injury leading to reduced proliferative capacity, with later death of the injured stem cell and all of its progeny. Thus the picture seen is a result of both quantitative and qualitative changes resulting directly from the exposure of the stem cells, and species differences relative to sensitivity and time course of events appear to depend to a large degree on differential sensitivity of the bone marrow stem cell populations to death and injury. (auth)
Date: July 19, 1963
Creator: Bond, V.P. & Fliedner, T.M.
Partner: UNT Libraries Government Documents Department

AN INFORMATION STORAGE AND RETRIEVAL SYSTEM FOR IRRADIATION EFFECTS IN METALS

Description: An information storage and retrieval system (PIC) was developed, utilizing the IBM 7090 computer, for handling data pertaining to the effects of neutron irradiation on metals. The input includes a reference identification, an appropriate abstract or extract summarizing the article, code identification parameters analogous to those used by the ASM-SLA Literature Classification System, and special codes identifying relevant irradiation and testing parameters. The output contains the same data plus printing out the meaning of all special codes. Presently, the information storage consists of more than two hundred references representing several thousand lines of information. The system is both general and definitive, permitting the selection of a single piece of information or of many references dealing with a general field. It is possible to select material on the basis of one or more of the following factors: material, general or specific; type of literature; general or specific property such as mechanical tests or tensile tests; conditions of irradiation including type and level of flux, integrated flux, irradiation temperature, and reactor environment; test conditions such as temperature and environment; and general variables that might be controlling such as strain rate, specimen geometry, grain size, and fabrication history. It is felt that this system and the data systems will permit the rapid selection of relevant references once an optimum number of such references are available. (P.C.H.)
Date: August 15, 1963
Creator: Bush, S. H.
Partner: UNT Libraries Government Documents Department

Relative hazard of the various radioactive materials

Description: An equation is given for the relative hazard, H, of various radionuclides under uniform working conditions. H is defined as the ratio of the average muC/cc inhaled in the working area to the maximum permissible concentration, MPC, of the radionuclide for occupational exposure. The variation of H is discussed in relation to such parameters as radioactive and biological half lives of the radionuclides, fractional retention, dilution factors, specific activity, energy, RBE, relative damage factor, n, mass of the critical organ, and the maximum permissible does to the critical organ. Comparisons are made with values of H obtained by this and other investigations. The values of H obtained by this method appear to be consistent with estimates from operational experience. A table of values of specific activity, (MPC)/sub c/ and relative hazard, H, is given for the radionuclides listed in ICRP Publication No. 2, p.us values for a number of additional transuranic elements not previously listed by the ICRP.. (auth)
Date: January 1, 1963
Creator: Morgan, K.Z.; Synder, W.S. & Ford, M.R.
Partner: UNT Libraries Government Documents Department

Serology of Aerobic Aquatic Actinomycetes

Description: Article on the serology of aerobic aquatic actinomycetes.
Date: February 13, 1963
Creator: Guthrie, R. K.; Roach, A. W. & Ferguson, J. K.
Partner: UNT College of Arts and Sciences

Variation of the Half-Wave Potential of Organic Compounds With pH. Report No. 78

Description: From 19th International Union of Pure and Applied Chemistry Congress, London. A systematic introduction is presented to the subject of the variation with pH of the polarographic half-wave potential, which is probably the most readily measured electrochemical energetic parameter of organic compounds. Emphasis is placed on (a) the types of relationships observed for both reversible and irreversible electrode processes, (b) the mathematical formulation of these relationships, (c) the structural, mechanistic, kinetic, and environmental factors influencing such relationships, and (d) the presumptive physical causes for such relationships, e.g., the effect of pH on the electrochemical kinetics. Although the discussion is primarily concerned with behavior in aqueous solution, the conclusions drawn are equally valid for nonaqueous media in which hydrogen ion or some other Lewis acid can play a significant role. The half-wave potential for an organic electrode process may be independent of pH, or may vary lineanly or sigmoidally; other types of relationships observed are likely to be combinations of such effects. These variations may be due (a) to direct participation of hydrogen ion in the transition state involving the electroactive site in the organic molecule and the electron source, e.g., polarization of the bond to be broken, (b) to control of the state of reactants and/or products via participation in pre- and postequilibria, e.g., acid-base equilibria affecting the nature of the reactant or (c) to the effects of other kinetic, adsorption, steric, hydrogen-bonding and electrical double layer phenomena, as well as to combinations and variations of these effects. Solution composition factors influencing the observed variation of half-wave potential with pH include the ionic strength, the nature of the solvent, the specific identity of buffer components, and nonspecific salt effects. The implications of the experimentally observed half-wave potential-pH relations are considered in respect to the development of analytical procedures and the ...
Date: June 21, 1963
Creator: Elving, P. J.
Partner: UNT Libraries Government Documents Department

LYMPHOCYTE PRODUCTION MEASURED BY EXTRACORPOREAL IRRADIATION, CANNULATION AND LABELING TECHNIQUES

Description: The labeling of newly-formed lymph cells with tritiated thymidine, lymphatic duct cannulation, and the peripheral destruction of lymphocytes by extracorporeal irradiation of the blood were used to estimate the mass of prestored lymphocytes and the relative degree of recirculation of 1ymphocytes from blood to lymph and back again. Topics discussed include the effects of extiacorporeal irradiation on the histologic picture of the lymphoreticular tissue, the influence of extracorporeal irradiation upon the thoracic duct output, and preliminary observations on labeling of lymphocytes by tritiated thymidine at the completion of extracorporeal irradiation. Data indicate that the mass of preformed small lymphocytes may be as large as 40 times that present in peripheral blood, that the blood feeds lymphocytes primarily into the lymph, and presents strong evidence for lymphocyte recycling. (C.H.)
Date: January 1, 1963
Creator: Cronkite, E.P.; Jansen, C.R.; Cottier, H.; Rai, K. & Sipe, C.R.
Partner: UNT Libraries Government Documents Department

Neutron Radiographic Inspection of Heavy Metals and Hydrogenous Materials

Description: The possibility of using thermal-neutron radiography for inspecting heavy metals and hydrogenous materials was examined. The data include exposure curves, contrast sensitivities, and an assessment of the influence of higher energy neutrons and interfering gamma radiation on image quality. It is shown that, in the case of homogeneous materials, neutron radiography presents definite advantages for the inspection of heavier metals such as uranium, bismuth, and lead, and that the images obtained in such inspections are influenced very little by other radiation in the thermal-neutron beam. This is somewhat less true for intermediate metals such as steel and tungsten, although in these cases too, some exposure time advantage can usually be gained. Nevertheless, neutron radiographic inspection of these intermediate materials may be limited to those cases in which some complication, such as radioactivity of the sample, is involved. Thermal-neutron inspection of hydrogenous materials having a thickness greater than about an inch is not recommended and may be useful primarily in special cases such as one in which the light material is in some combination with a heavier, x-ray absorbing material. (auth)
Date: March 11, 1963
Creator: Berger, H. & Kraska, I. R.
Partner: UNT Libraries Government Documents Department

Automatic Exit Steam Quality Control for Boiling Water Reactors

Description: 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.
Partner: UNT Libraries Government Documents Department

Buckling Measurements-Heavy Natural Uranium Tubular Fuel Assemblies

Description: One-region buckling measurements that were made on a series of D/sub 2/O- moderated lattices of heavy uranium metal tubes in the Process Development Pile at Savannah River Laboratory are presented. The purposes of these measurements are to provide normalization points for lattice bucklings and to extend the study of natural uranium- D/sub 2/O systems. The dependence of buckiing on the moderatorto-fuel ratio is studied for two types of lattices. (R.E.U.)
Date: November 1, 1963
Creator: Dunklee, A. E. & Graves, W. E.
Partner: UNT Libraries Government Documents Department

Instrumentation for Fission Fragment Energy Correlation Experiments

Description: From International Conference on Nuclear Physics with Reactor Neutrons, Argonne, Ill., Oct. 1963. Experiments were performed in which the kinetic energies of correlated fragment pairs from thermal- and resonance-neutron-induced fission were measured. In addition, a three-parameter ternary fission experiment was performed in which the energies of correlated fragments were measured in coincidence with the energy of a third emitted particle, usually a long-range alpha particle. The detectors were large-area silicon surface barrier detectors. The instrumentation associated with these experiments is discussed in detail. The complete system is described, with attention given to the problems of background reduction (fast-coincidence requirements), stability, linearity, and resolution. Particular attention is given to the reduction of spectrum distortion by pile-up pulses (alphaon-fission pile-up within the amplifier resolving time). Methods and limitations of pile-up detection are discussed. A new method for inspection and removal of pile-up pulses is described. (auth)
Date: January 1, 1963
Creator: Williams, C. W.; Schmitt, H. W.; Walter, F. J. & Neiler, J. H.
Partner: UNT Libraries Government Documents Department

OXYGEN-17 NMR SHIFTS CAUSED BY Cr$sup ++$ IN AQUEOUS SOLUTIONS

Description: Cr{sup++} in solution produces a paramagnetic shift in the NMR absorption of 0{sup17} in C1O{sub4}{sup-}, as well as the expected paramagnetic shift for 0{sup17} in H{sub2}O. As the concentration of C1O{sub4}{sup-} increases, the shift in the H{sub2}O{sup17} absorption is diminished, and eventually changes sign. The effects are ascribed to preferential replacement by C1O{sub4}{sup-} of water molecules from the axial positions in the first coordination sphere about Gr{sup++}.
Date: February 15, 1963
Creator: Jackson, J.A.; Lemons, J.F. & Taube, H.
Partner: UNT Libraries Government Documents Department

EXPERIMENTAL STUDIES ON THE CURRENT CARRYING CAPACITY OF NbZr WIRES UNDER CONDITIONS OF FIXED AND SWEPT MAGNETIC FIELD

Description: The current-carrying capacity of Nb- Zr wire was studied under conditions of swept magnetic field and fixed wire current and of fixed magnetic field and swept wire current. The effects of wire movement, thermal environment, copper coating of the wire, and rate of sweep of wire current or magnetic field were determined for these test conditions. (auth)
Date: January 1, 1963
Creator: Laverick, C
Partner: UNT Libraries Government Documents Department

Evaluation of Resonance Capture Approximations

Description: The program KRUDE, which solves the slowing down and adjoint equations for a mixture of resonance and nonresonance isotopes in an infinite homogeneous medium, was used to evaluate some resonance capture approximations (variational and successive) that use linear combinations of narrow and wide resonance fluxes. Results obtained for resonance capture in the 291-ev resonance of Zr/sup 91/ and the 192-ev resonance of U/sup 238/ are compared, and three methods for including Doppler effects in the variational method are considered. (D.C.W.)
Date: November 21, 1963
Creator: Edgar, K. R.
Partner: UNT Libraries Government Documents Department

Reactivity Worth of Transverse Gaps

Description: Fuel blocks of compacted ZrO/sub 2/ and UO/sub 2/ powder in paraffin were added axially to two unreflected assemblies (20 x 16 in. and 20 x 24 in. cross sections). The separation of the assembly halves when criticality occurred was determined, and the reactivity worth at a given critical gap size was obtained by bringing the halves slightly closer together and observing the reactor period. The core with the larger cross section had a maximum gap twice that of the smaller core. Diffusion theory treatment agreed with the data reasonably well for small gap thickness. (D.C.W.)
Date: November 1, 1963
Creator: Weinstein, S. & Feiner, F.
Partner: UNT Libraries Government Documents Department

THE DIFFUSION OF FAST NEUTRONS

Description: From American Nuclear Society Meeting, New York, Nov. 1963. The use of the asymptotic solution to the one-velocity transport equation is considered. The angular distribution for fast neutron elastic scattering by heavy elements is discussed. An exponential angular distributi on is assumed to simplify the decay length calculation. The diffusion length of 1 to 15 Mev neutrons in iron is calculated, as well as the vector flux angular dependence. The asymptotic solution for an arbitrary angular distribution of a plane delta -function source is also found. An isotropic source is investigated, and some applications of the model are examined. (auth)
Date: January 1, 1963
Creator: Francis, N C; Brooks, E J & Watson, R A
Partner: UNT Libraries Government Documents Department

Old and New Problems in the Field of Vapor-Liquid Equilibria

Description: A review is presented on vapor-liquid equilibria. Arnong the topics discussed are activity coefficients, consistency criteria, automatic computation, and gaseous mixtures. A bibliography of 18 references is included. (D.L.C.)
Date: July 16, 1963
Creator: Redlich, O.
Partner: UNT Libraries Government Documents Department