UNT Libraries Government Documents Department - 22 Matching Results

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Automatic Scanning And Measuring Of Bubble Chamber Photographs

Description: The development of high-energy charged particle accelerators such as the Bevatron and of improved nuclear-event detection devices such as the Berkeley 72-in. hydrogen bubble chamber has greatly increased the need for high-speed data reduction of nuclear events. Full exploitation of the potential of the 72-in. bubble chamber demands a very high-speed analysis system. This paper describes an approach to such a system.
Date: June 1, 1960
Creator: Grasselli, Antonio
open access

Calculation of Shielding for Mark II Accelerator

Description: The proper roof thickness to correspond with a given side wall thickness has been estimated fro experience with the 184 feet cyclotron, which has indicated that a roof of about 1 1/2 feet should accompany a wall of 5 feet, and a roof of 4 feet should accompany a wall of 15 feet. For the roof area involved, this should bring about the condition that down-scattered neutrons in the working areas are but a small fraction of the neutrons coming through the side walls.
Date: June 30, 1951
Creator: Moyer, B. J.
open access

Color Production From Energetic Ions Impinging On Metals

Description: It has been observed that energetic gaseous ions mark their region of impingement on certain metals in color. Under identical conditions of bombardment, multicharged ions of the same gas mark their impact areas with different colors. The colors are sensitive to the type and energy of the ion as well as to the metal bombarded. These colors may result from reflections from thin films formed by reactions at the target. Because the colors indicate that thicker films are produced with increased ion … more
Date: June 25, 1962
Creator: Ehlers, Kenneth W.
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Decay Modes Of Charged [Sigma] Hyperons

Description: Apparent [Sigma] hyperon decay events in a large emulsion stack of 240 9" x 12" pellicles have been classified into those judged to have occurred at rest and those in flight. Of 36 decay events at rest, 21 secondaries were observed to be protons of about 1675 microns range. Of the events decaying in flight, 23 were decays into protons and 46 were decays into near-minimum secondaries. Attempts have been made to trace the tracks of 35 of the lightly ionizing secondaries; the results of this effor… more
Date: June 23, 1958
Creator: Barkas, Walter H. (Walter Henry), 1912-1969; Dyer, J. N.; Giles, P. C.; Heckman, Harry H.; Mason, C. J.; Nickols, N. A. et al.
open access

Design Considerations Of Ultrahigh Vacuum Systems For Metallurgical Applications

Description: Under the stimulus of electronic materials development - particularly thin-film studies - and the need for space environmental simulation chambers, a very rapid increase in the availability of industrial-sized vacuum components and systems operable in the ultrahigh vacuum range has taken place in the last three years. It is the purpose of this paper to explore the design considerations of ultrahigh vacuum systems for metallurgical applications.
Date: June 10, 1964
Creator: Batzer, Thomas H. & Bunshah, R. F. (Rointan Framroze)
open access

Drift Tube Model Magnet Report

Description: Early in the design of the Mark I accelerator it was decided to install magnetic lenses in the drift tubes. A number of model magnets were constructed and tested to determine the best design for these lenses. This report includes only the results of the tests on the final models of the magnets that are designed for Mark I.
Date: June 27, 1952
Creator: Sewell, D. & Parmentier, H.
open access

Electron Loading and High Voltage Sparking of Metals in Vacuum

Description: Statistical methods were employed to measure relative values of electron loading and spark-over voltage for a large number of unoutgassed electrode materials. Test voltages up to 110 KV were employed in vacuum of the order of 10<sup>-7 mm Hg. All metals showed a square root dependence between spark-over voltage and spacing.
Date: June 29, 1953
Creator: Heard, Harry G.
open access

An Investigation of the Isotopes of Americium and Curium

Description: Isotopes of americium and curium with mass numbers less than 242 have been produced by cyclotron bombardment techniques, and several of their nuclear properties have been investigated. The partial alpha half-lives of Am(239), Cm(241), and Cm(240) and the partial half-life for spontaneous fission of Cm(240) were measured. The alpha decay daughter of Cm(238) was found and evidence for the discovery of Am(237) (an -1 hour electron capture activity) and Cm(239) (an -10 hour electron capture activ… more
Date: June 1952
Creator: Higgins, Gary Hoyt
open access

Neutron Streaming in a Cylindrical Cavity

Description: The free streaming of neutrons in a cylindrical cavity is investigated. Using experimental data for the flux distribution along the walls, the direct beam hole loss and leakage into the target from the lattice is estimated for the MTA system.
Date: June 4, 1952
Creator: LeLevier, R.
open access

On Neutron Evaporation From Excited Nuclei

Description: At high excitation energies, competition of proton and c-particle emission with neutron emission becomes important. For low excitation, the competition between Y-emission, neutron emission, and fission should be taken into account. To aid in the evaluation of this competition an experiment has been performed to measure the number and energy spectrum of the protons and c-particles emitted in the high energy bombardment of uranium with protons, deuterons, and c-particles.
Date: June 18, 1953
Creator: Adelman, Frank L.
open access

Photosynthesis

Description: The problem of photosynthesis is the problem of defining the way in which green plants are able to convert electromagnetic energy into chemical potential in the form of reduced carbon, usually as carbohydrate, and molecular oxygen. The use of tracer carbon, as carbon-14, has made possible considerable progress in the mapping of the routes taken by the carbon atom from CO2 into plant substances. The techniques of separation and identification that have made this progress possible lie largely in … more
Date: June 1958
Creator: Calvin, Melvin, 1911-1997
open access

Physics Division Quarterly Report: February, March and April, 1952

Description: Quarterly summary report of studies conducted through the University of California Radiation Laboratory. Some results reported in the report may be of a preliminary or incomplete nature.
Date: June 16, 1952
Creator: University of California. Radiation Laboratory.
open access

Proposed R.F. Buncher for A-12

Description: A buncher and pre-accelerator for A-12 is described that has 360 degree acceptance and could handle a current of one ampere from a low voltage source.
Date: June 25, 1952
Creator: Colgate, S. A.
open access

Quantitative Aspects Of Mating Behavior In Drosophila

Description: Individual Samarkand wildtype D. melanogaster males were permitted to choose between either two white-eyed or two red-eyed females or between a red-eyed and a white-eyed female. Observations of the flies were made over a period of about two hours and premating periods, intermating periods and the durations of copulations were recorded.
Date: June 24, 1960
Creator: Hildreth, Philip E.
open access

Some Unsolved Problems Of Explosive Sensitivity

Description: To properly assess the "sensitivity" of explosives systems under impact conditions we must obtain detailed information on these mechanisms by which explosives are ignited by impact. It is necessary to know which impact conditions represent the greatest hazard to explosive materials, as well as to know for a given impact condition the relative responses of explosives of interest. I should like to describe to you a program sponsored jointly by the Department of Defense and the Atomic Energy Commi… more
Date: June 1, 1964
Creator: James, Edward
open access

Square Wave Testing of Air Dielectric Coaxial Transmission Line Components

Description: An outline is given for mismatch and delay measurements methods on air dielectric transmission line components, and techniques for square wave testing are outlined. Equipment design of the needed pulsers, attenuation and delay sections, and high speed oscilloscopes is disclosed. The final section of this report is devoted to measurements and how to analyze results
Date: June 1951
Creator: Heller, Robert E.
open access

A Study Of The Homopolar Generator As An Energy-Storage Device

Description: In the course of modern physics research, the need frequently arises for storage of large quantities of electrical energy which can be periodically discharged at high peak power into a load. Until recently, the homopolar machine has been an intriguing device having considerable academic interest but little practical value. In recent years, successful machines have been developed to utilize liquid-metal brush systems. The liquid-metal brush overcomes all the problems associated with current coll… more
Date: June 1, 1964
Creator: Van Ness, Hugh W. & North, G. Gordon
open access

The Theory Of Emulsion Track Structure

Description: The statistical behavior of measured track quantities, gap density, gap length coefficient, and lacunarity is studied. The transformations which give the expectation values of track quantities on inclined tracks are then found.
Date: June 1960
Creator: Barkas, Walter H. (Walter Henry), 1912-1969
open access

Three Group Equations for a Multiplying Medium

Description: In the past it was felt that the easiest way to treat a three group equation for a MTA lattice was to solve it without certain terms. This iterative procedure converged rapidly for a medium with depleted uranium fuel, and in fact, a second iteration was not needed.
Date: June 11, 1952
Creator: Adelman, F. L.
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