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Another Glimpse
Excerpt from an issue of "The Bookman" magazine including the cover, table of contents and a note from the editor about the reception of Arthur W. Page's "Little Pictures of O. Henry" series. Includes a letter to the editor written by Robert H. Davis about the author's first impressions of O. Henry. Illustrated by a self-portrait of O. Henry.
Date:
November 1913
Creator:
unknown
System:
The Portal to Texas History
The Eight New Synthetic Elements
In an early continuation of the investigation of the radioactive isotopes of element number 43 (technetium) Segre and Seaborg produced by the deuteron and neutron bombardment of molybdenum the isotope Tc{sup 99}, which they observed to decay by means of an isomeric transition with a half-life of 6.6 hours to a lower isomeric state with a half-life greater than 40 years. The upper isomeric state of this isotope was observed by Segre and C. S. Wu to be produced in the fission of uranium and more recently R. P. Schumann and also D. C. Lincoln and W. H Sullivan working on the Plutonium Project of the Manhattan District have independently observed the beta-particles of half-life about 10 years due to the lower isomeric state. Later work by E. E. Motta and G. E. Boyd sets a more accurate value of 9.4 x 10{sup 5} years for this half-life. Since this isotope is formed in rather large amounts, namely, a fission yield of 6.2%, in the slow neutron induced fission of uranium it is now possible to isolate technetium in weighable amounts and in rather substantial quantities. For example, a uranium pile operating at a power level of 10{sup 5} kw …
Date:
November 1, 1947
Creator:
Seaborg, Glenn T.
System:
The UNT Digital Library
The Eight New Synthetic Elements
None
Date:
November 1, 1947
Creator:
Seaborg, Glenn T.
System:
The UNT Digital Library
Fused-Salt Heat Transfer
This paper presents, in two parts, a general discussion of fused-salt heat transfer. The first part is a report on current experimental results with three new salts - an alkali metal-base fluoride, a zirconium-base fluoride, and an alkali metal nitrate-nitrite mixture known as 'HTS'. In the second part fused salts are compared with liquid metals on the basis of their heat transfer effectiveness as reactor coolants. An analysis is presented for a general solid fuel-element reactor which transfers its heat to a fluid boiling on the outside of the heat exchanger tubes. The results show that fused salts can be as good heat transfer media as liquid metals. (auth)
Date:
November 1, 1956
Creator:
Hoffman, Herbert W.
System:
The UNT Digital Library
Some heat transfer and fluid friction experiments with supercritical water
None
Date:
November 1, 1956
Creator:
Randall, David G.
System:
The UNT Digital Library
The Bevatron
None
Date:
November 8, 1958
Creator:
Lofgren, Edward J.
System:
The UNT Digital Library
FRACTIONATION OF THE INSOLUBLE MATERIAL OF CHLORELLA CELLS
None
Date:
November 1, 1959
Creator:
Stange, Luis; Moses, V. & Calvin, M.
System:
The UNT Digital Library
PHASE SHIFTS IN pi+ -p SCATTERING AT 310 Mev
In an experimental program recently completed at the 184-inch synchrocyclotron in Berkeley, data were obtained on elastic {pi}{sup +}-p scattering at a laboratory energy of 310 Mev. Quantities measured were the differential cross section, the total cross section, and the polarization of the recoil protons as a function of center-of-mass angle. We have analyzed the data in terms of S, P, and D waves and have obtained only one acceptable solution. The resultant set of phase shifts is of the Fermi type. The D-wave phase shifts are small but definitely needed to obtain an adequate fit to the data. Owing to the relatively high accuracy of the cross-section data and the inclusion of the results of the polarization experiment, the errors on the small phase shifts have been reduced to less than 1{sup 0}. The differential cross-section and polarization data are given in Tables I and II.
Date:
November 18, 1959
Creator:
Foote, James H.; Chamberlain, Owen; Rogers, Ernest H.; Steiner,Herbert M.; Wiegand, Clyde & Ypsilantis, Tom
System:
The UNT Digital Library
Planning for Profits in World Business
Article reprinted from The Harvard Business Review discussing trends in United States imports and exports and maximizing profits in international business trade.
Date:
1960-11/1960-12
Creator:
Hodgson, Raphael & Michaelis, Michael
System:
The Portal to Texas History
Atom to Adam
This report talks about the molecules which constitute today's living organisms
Date:
November 1, 1963
Creator:
Calvin, Melvin & Calvin, G. J.
System:
The UNT Digital Library
Breeding Potential of the Liquid Metal Breeder (LIMB) Reactor
This paper presents data concerning the breeding ratio and doubling time possible with LIMB technology.
Date:
November 1, 1963
Creator:
Teitel, R. J. & Brown, J. B., Jr.
System:
The UNT Digital Library
Buckling Measurements-Heavy Natural Uranium Tubular Fuel Assemblies
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.
System:
The UNT Digital Library
Development of Fueled Graphite Containing Pyrolytic-Carbon Coated Carbide Particles for Nonpurged, Gas-Cooled Reactor Systems
Progress is report in several areas of development of fuel graphite containing coated particles for nonpurged gas-cooled reactor systems.
Date:
November 1, 1963
Creator:
Carlsen, F. L., Jr.; Bomar, E. S. & Harms, W. O.
System:
The UNT Digital Library
MEAN SQUARE VOLTAGE FLUCTUATION MEASUREMENTS WITH NEUTRON-SENSITIVE ION CHAMBERS
The mean square fluctuation voltage in neutron sensitiv ion chambers was measured rather than the d-c current to improve gamma discrimination and eliminate d-c cable leakage interference currents. The circuitry and chambe are described, and performance in the mean square volta mode is compared with that in the d-c current mode. (D.C.W.)
Date:
November 1, 1963
Creator:
DuBridge, R A
System:
The UNT Digital Library
Mechanical Properties of Thin Films. Technical Report No. 29
vention of the Society for Nondestructive Testing. The elastic and plastic properties are reviewed with special emphasis on metal films prepared by vacuum evaporation, although work with both non-metals and other preparation techniques is discussed when it is the only existing data or has particular importance. A definite lack of agreement exists among the various workers and as a result detailed explanations are not possible although general suggestions do exist. The structure of thick polycrystalline films is reviewed as it is important to a discussion of the mechanical properties, but the structure is in itseif poorly understood in the case of thick fllms. The general behavior may be summarized as follows: The elastic modulus seems to be the same as that of bulk material. Breaking strengths are normally 3 to 7 times larger than those of annealed bulk material and compare with values for very heavily cold-worked samples. Creep is usually observed at relatively low strains. The increased strength undoubtedly arises from a restriction of dislocation motion, as well as source limitations, and in this respect differ from whiskers which often have a low dislocation concentration. The relative importhnce of pinning by point defects or impurities, limitations of dislocation length …
Date:
November 1, 1963
Creator:
Hoffman, R W
System:
The UNT Digital Library
Reactivity Worth of Transverse Gaps
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.
System:
The UNT Digital Library
Advanced Designs and Special Applications for Fast Breeders
None
Date:
November 11, 1963
Creator:
Hammond, R. P.
System:
The UNT Digital Library
Analysis of Vanadium in Milk Powder by Neutron Activation Analysis Using a Rapid Radiochemical Separation of 3.77-Minute Vanadium-52
A procedure is described for the activation determination of V in powdered milk using 3.77-min V/sup 52/. The quantity of V in the sample is obtained by comparing the V/sup 52/ radioactivity found in the test sample with the V/sup 52/ radioactivity in a V comparator sample that is treated in the same manner as the test sample. The procedure can also be used for the determination of V in a variety of materials. (P.C.H.)
Date:
November 15, 1963
Creator:
Molinski, V. J.; Wahl, W. H. & Strain, W. H.
System:
The UNT Digital Library
BETA RADIATION PROCESSING AT RIGOROUS CONDITIONS
An investigation was conducted on the impossible use of beta radiation to promote chemical reactions at high temperatures and pressures. The advantages of beta sources over other radiation sources are enumerated. A radiation processing apparatus is described which allows operations to 10,000 psi and 500 deg C and uses 90 C of Sr/sup 90/-Y/sup 90/. The dosimetry of the source was accomplished with an iodineheptane system, and the mean dose rate within the chemical reactor was determined to be 0.98 x 10/sup 6/ rad/hr. The radiation utilization efficiency in the dosimetry measurements was determined to be 34.7%. Results of runs on hydrogenation of coal extract indicate that radiation does not increase the extent of hydrogenation, but that radiation reduces the content of hetero atoms N and S in the 100 x 400 deg C boiling oil products. The use of beta radiation in the hydrorefining of oils is suggested. (D.L.C.)
Date:
November 15, 1963
Creator:
Yavorsky, P M & Gorin, E
System:
The UNT Digital Library
The Factors Limiting the Utilization of Zirconium Alloys in Superheated Steam
New experimental data and literature data are utilized to determine the upper temperature of usefulness of zirconium alloys. Three basic engineering assumptions are used: (1) service life requirements are on the order of four years; (2) tubular fuel cladding for rod-type fuel is considered with a maximum wall thickness of 1.27 cm; and (3) heat fluxes are above 157 watts/cm/sup 2/. The interrelation of three basic factors, corrosion rate, corrosion embrittiement by hydrogen and oxygen, and strength are considered. An upper limit for an acceptable corrosion rate for a long-term service of 1 mg/dm/sup 2//day is set primarily by the effect of heat-transfer on corrosion. For the best alloys anticipated, this requirement (even without considering transient conditions) limits cladding surface temperatures to less than 540 C. Oxygen embrittiement of the alloy substrate by oxide film dissolution is not expected to be a limiting factor. Corrosion hydrogen embrittiement was studied in detail and found to limit acceptable service to cladding surface temperatures of less than 525 deg C for established experimental alloys. Hydrogen embrittlement may not be a limiting factor if alloys corrosion resistant enough to be acceptable above 600 deg C could be developed. Zirconium alloys designed for higher strength …
Date:
November 20, 1963
Creator:
Klepfer, H H & Douglass, D L
System:
The UNT Digital Library
Evaluation of Resonance Capture Approximations
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.
System:
The UNT Digital Library
GENERALIZATION OF THE ACTIVATED COMPLEX THEORY OF REACTION RATES. I. QUANTUM MECHANICAL TREATMENT
In its usual form activated complex theory assumes a quasi-equilibrium between reactants and activated complex, a separable reaction coordinate, a Cartesian reaction coordinate, and an absence of interaction of rotation with internal motion in the complex. In the present paper a rate expression is derived without introducing the Cartesian assumption. The expression bears a formal resemblance to the usual one and reduces to it when the added assumptions of the latter are introduced. The new equation for the transmission coefficient contains internal centrifugal terms. The derivation employs an extension of the Stackel-Robertson formalism for separation of variables in mechanics. The fourth assumption can also be weakened and a rotational interaction included in the formalism. In applications of the rate equation use is made of the recent findings that in the immediate vicinity of a saddle-point or a minimum a potential energy surface can be imitated in some major topographical respects by a surface permitting separation of variables. The separated wave equation for the reaction coordinate is then curvilinear because of the usual curvature of the path of steepest ascent to the saddle-point. Calculations of transmission coefficients and rates can be made and compared with those obtainable from the usual one-dimensional …
Date:
November 1, 1964
Creator:
Marcus, R.A.
System:
The UNT Digital Library
GENERALIZATION OF THE ACTIVATED COMPLEX THEORY OF REACTION RATES. II. CLASSICAL MECHANICAL TREATMENT
In its usual classical form activated complex theory assumes a particular expression for the kinetic energy of the reacting system one associated with a rectilinear motion along the reaction coordinate. The derivation of the rate expression given in the present paper is based on the general kinetic energy expression.
Date:
November 1, 1964
Creator:
Marcus, R.A.
System:
The UNT Digital Library
Simple Experimental Techniques for Deposition of Tungsten From Tungsten Hexacarbonyl
None
Date:
November 1, 1964
Creator:
McGuire, J.C.
System:
The UNT Digital Library