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21,925 Matching Results

Start Over Year 1964 Language English

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(open access)

Engineering Development of Fluid-Bed Fluoride Volatility Processes: Part 5. Description of a Pilot-Scale Facility for Uranium Dioxide-Plutonium Dioxide Processing Studies

Report describing a pilot plant constructed at Argonne National Laboratory for studying two major process steps for the recovery of uranium and plutonium from spent nuclear fuels of power reactors. A major objective is the demonstration of optimum process conditions for the two steps for synthetic reactor fuel compositions, including those containing mixtures of inactive fission products.

Date: 1964

Creator: Vogel, G. J.; Carls, E. L. & Mecham, W. J.

Object Type: Report

System: The UNT Digital Library

(open access)

Design and Construction of a Desalination Pilot Plant, a Reverse Osmosis Process

Report containing plans for a desalination pilot plant for the purposes of evaluating the feasibility of reverse osmosis for the desalination of sea and brackish water with the capacity of 1,000 gallons of potable water produced per day.

Date: January 1964

Creator: Aerojet-General Corporation

Object Type: Report

System: The UNT Digital Library

(open access)

The Koppers Hydrate Process for Saline Water Conversion Experimental and Engineering Studies

Report covering the research and development work on the Koppers Hydrate Process as a means of desalting sea water. The process is a chemical one, in which a hydrating agent, such as propane or dichlorodifluoromethane, and water combine to form insoluble crystals. Most of the work was carried out in bench-scale equipment or laboratory research.

Date: 1964

Creator: Koppers Company

Object Type: Report

System: The UNT Digital Library

(open access)

Diffusion Still Analysis

Report describing a diffusion still for desalination of water, which produces pure water at temperatures below the boiling point by diffusion in the presence of air. The principal advantage of the concept is great mechanical simplicity, requiring neither high vapor pressure nor vacuum equipment.

Date: 1964

Creator: Kroeger, Peter

Object Type: Report

System: The UNT Digital Library

(open access)

Reverse Osmosis for Water Desalination

Report issued by the Office of Saline Water over studies conducted on the reverse-osmosis program. The methods of desalination through osmosis are discussed. This report includes tables, illustrations, and photographs.

Date: May 22, 1964

Creator: Lonsdale, H. K.; Merten, U.; Riley, R. L.; Vos, K. D. & Westmoreland, J. C.

Object Type: Report

System: The UNT Digital Library

(open access)

Observation of a Nonstrange Meson of Mass 959 Mev

None

Date: April 4, 1964

Creator: Kalbfleisch, George R.; Alvarez, Luis W.; Barbaro-Galtieri, Angela; Dahl, Orin I.; Eberhard, Philippe; Humphrey, William E. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

ABSORPTION CHANGES IN BACTERIAL CHROMATOPHORES. II. A NEWCHLOROPHYLL-LIKE PIGMENT FROM THE OXIDATION OF CHROMATOPHORES FROMRHODOSPIRILLUM RUBRUM

Evidence is presented which points to (at least) two bound forms of bacteriochlorophyll present in chromatophores of Rhodospirillum rubrum, both of them readily converted to unbound bacteriochlorophyll (abs. max. 770 mu) when the chromatophores are extracted with acetone or ethanol. Controlled oxidation of the chromatophores with Ir(IV) or with Zn(II) and ferricyanide preferentially destroys the more strongly absorbing pigment (abs. max. 880 mu) but brings about only a slight decrease in the magnitude of the photoinduced absorption changes at 810 and 792 mu. Such oxidations yield a new pigment, absorbing at 715 mu in the aqueous preparation and, more strongly, at 680-684 mu when the pigment is extracted into organic solvents. This pigment is formed irreversibly and is therefore different from the material formed by photooxidation of chromatophores. Its visible spectrum and the spectrum of the material formed from it by acidification suggest that it is a chlorophyll-like substance, possibly derived from bacteriochlorophyll by (two-electron) oxidation of one of the dihydropyrrole rings to a pyrrole ring. Directions are given for separation of this pigment from other colored compounds present in the oxidation mixtures.

Date: October 1, 1964

Creator: Gould, Edwin S.; Kuntz Jr., Irwin D. & Calvin, Melvin

Object Type: Report

System: The UNT Digital Library

(open access)

LRL 25-INCH BUBBLE CHAMBER

The recently completed 25-inch hydrogen bubble chamber combines excellent picture quality with a fast operating cycle. The chamber has a unique optical system and is designed to take several pictures each Bevatron pulse, in conjunction with the Bevatron rapid beam ejection system. At present the chamber operates twice per Bevatron pulse. The general features of the chamber constructiosn are shown in Figs. 1 and 2. The chamber is ten inches deep at the narrowest point. The magnet is of conventional water cooled design and in present operation produces a vertical field of 18.5 kgauss. With suitable generators it has produced a field of 22.8 kgauss. The most important new features are discussed below.

Date: July 8, 1964

Creator: Alvarez, Luis W.; Gow, J.D.; Barrera, Frank; Eckman, Glenn; Shand, Jim; Watt, R. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

THE STRUCTURE OF THE SO-CALLED ''ETHYLMETAPHOSPHATE'' (LANGHELDESTER)

Phosphorus pentoxide reacts with ether to form bicyclo-tetraphosphate ester (II), cyclotetraphosphate ester (III), isocyclotetraphosphate ester (IV), and tetraphosphate ester (V). Phosphorus n.m.r. measurements show the content of the mixtures. The so-called 'ethyl metaphosphate' (Langheld ester) is a mixture of III (50% to 45%), IV (36% to 25%), and V (14% to 30%).

Date: June 1, 1964

Creator: Burkhardt, Gottfried; Klein, Melvin & Calvin, Melvin.

Object Type: Report

System: The UNT Digital Library

(open access)

POLARIZATION IN PROTON-PROTON SCATTERING USING A POLARIZED TARGET.Part I. 0.330 to 0.740 GeV Part II 1.70 to 6.15 GeV

Using the Berkeley polarized-proton target, we have measured the polarization parameter P({theta}) for proton-proton (p-p) scattering. The measurements were obtained at beam kinetic energies of 0.330, 0.680, and 0.740 GeV at the 184-in. synchrocyclotron and 1.70, 2.85, 3.50, 4.00, 5.05, and 6.15 GeV at the Bevatron. The angular regions measured were from 20 to 100 degrees center of mass; the square of the four-momentum transfer ranged from 0.1 to 0.8 (GeV/c){sup 2}.

Date: June 24, 1964

Creator: Betz, F. W.; Arens, J. F.; Dost, H. E.; Hansroul, M. J.; Holloway, L. E.; Schultz, C. H. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

LONGITUDINAL RESISTIVE INSTABILITIES OF INTENSE COASTING BEAMS IN PARTICLE ACCELERATORS

The effect of finite resistance in the vacuum-tank walls on the longitudinal stability of an intense beam of particles in an accelerator is investigated theoretically. We show that even if the particle frequency is an increasing function of particle energy, the wall resistance can render the beam unstable against longitudinal bunching. In the absence of frequency spread in the unperturbed beam, the instability occurs with a growth rate that is proportional to (N/{sigma}){sup 1/2}, where N is the number of particles in the beam and {sigma} is the conductivity of the surface material. By means of the Vlasov equation a criterion for beam stability is obtained. In the limit of highly conducting walls the criterion involves the frequency spread in the unperturbed beam, the number of particles N, the beam energy, geometrical properties of the accelerator, but not the conductivity {sigma}. A numerical example presented indicates that certain observations of beam behavior in the MURA 40-Mev-electron accelerator may be related to the phenomenon we investigated.

Date: September 29, 1964

Creator: Neil, V. Kelvin & Sessler, Andrew M.

Object Type: Article

System: The UNT Digital Library

(open access)

CYANAMIDE: A POSSIBLE KEY COMPOUND IN CHEMICAL EVOLUTION

The prebiotic synthesis of phosphorus-containing compounds--such as nucleotides and polynucleotides--would require both a geologically plausible source of the element and pathways for its incorporation into chemical systems on the primitive Earth. The mineral apatite, which is the only significant source of phosphate on Earth, has long been thought to be problematical in this respect due to its low solubility and reactivity. However, in the last decade or so, at least two pathways have been demonstrated which would circumvent these perceived problems. In addition, recent results would seem to suggest an additional, extraterrestrial source of reactive phosphorus. It appears that the 'phosphorus problem' is no longer the stumbling block which it was once thought to be.

Date: May 1, 1964

Creator: Steinman, Gary; Lemmon, Richard M. & Calvin, Melvin

Object Type: Article

System: The UNT Digital Library

(open access)

CORRELATIONS BETWEEN PHOTOINDUCED EPR AND PHOTOCONDUCTIVITY INTONE-THF SOLUTION CHARGE-TRANSFER COMPLEX

Reversible photoinduced electron paramagnetic resonance (EPR) signals and photoconductivity were observed when a solution of tetracyancethylene (TCNE) in tetrahydrofuran (THF) was irradiated in the charge-transfer band of the complex formed between these two compounds. The eleven-line hyperfine structure of the EPR spectrum which was obtained demonstrated the presence of TCNE negative ion radical. The concentration of this radical was found to be directly proportional to the square root of the light intensity. Second order decay kinetics were followed when the light was shut off. Both the EPR signal and the photoconductivity rose initially as the square of the time. The latter portions of the growth curves could be fit to the latter portions of a hyperbolic tangential growth curve. From these data a reaction mechanism was proposed. The rate law dn/dt + kn{sup 2} = {alpha}L(1-e{sup -{beta}t}) = 0, where n = the concentration of radicals, t = the time, k, {alpha}, and {beta} are rate constants, and L = the light intensity, described both the photo-induced EPR and the photoconductivity within the limits of experimental accuracy.

Date: December 8, 1964

Creator: Ilten, David F. & Calvin, Melvin

Object Type: Article

System: The UNT Digital Library

(open access)

PRODUCTION OF S = 0, -1 RESONANT STATES IN K<sup>-</sup> p INTERACTIONS AT 2.45 GeV/c

About 70,000 pictures of 2.45-GeV/c K{sup -}-p interactions have been obtained in the present 72-inch hydrogen bubble-chamber experiment. Approximately 24,000 events of all topologies except 1-, 2-, and 3-prong events have been measured, and 50% have been remeasured. They report here on a study of the production of known resonances in the reactions: (1) K{sup -} + p {yields} {Lambda} + {pi}{sup +} + {pi}{sup -}; (2) K{sup -} + p {yields} {Lambda} + {pi}{sup +} + {pi}{sup 0} + {pi}{sup -}. The cross section for production and number of events in reactions (1) and (2) are given in Table I.

Date: July 7, 1964

Creator: Ross, Ronald R.; Friedman, Jerome H.; Siegel, Daniel M.; Flatte,Stanley; Alvarez, Luis W.; Barbaro-Galtieri, Angela et al.

Object Type: Article

System: The UNT Digital Library

(open access)

A POLARIZED PROTON TARGET

We have successfully conducted a series of experiments involving scattering of high energy pions and protons from a target containing polarized protons. Results of some of these experiments were reported at this conference, and in the literature. Proton polarizations as high as 65% have been measured; the average polarization during sustained data-taking has been typically 45%.

Date: July 3, 1964

Creator: Chamberlain, Owen; Schultz, Claude & Shapiro, Gilbert

Object Type: Article

System: The UNT Digital Library

(open access)

KINETIC STUDIES OF THE TWO LIGHT REACTIONS IN PHOTOSYNTHESIS

The decay kinetics of the photo-induced absorbance changes in red and green algae are very sensitive to the wavelength of the actinic 11ght. A four to twofold increase in half-decay time is noted in going from short wavelength (550-650 mu) to long wavelength (> 700 mu) excitation. The slow decay ratios, produced by long wavelength light can be enhanced with a steady background of short wavelength light. A relationship between initial decay rates and 02 evolution rates is described. This relationship allows a direct correspondence between these spectroscopic studies and the 'red-drop' and 'enhancement' experiments of Emerson.

Date: November 1, 1964

Creator: Kuntz Jr., I.D. & Calvin, Melvin

Object Type: Report

System: The UNT Digital Library

The Crafts and Worship [Exhibition Photographs]

Photographs of the exhibition "The Crafts and Worship," March 15-April 12, 1964, held at the Dallas Museum of Fine Arts. Photographs documenting this exhibition include sixteen gallery installation views.

Date: 1964

Creator: Dallas Museum of Fine Arts

Object Type: Collection

System: The Portal to Texas History