108 Matching Results

Search Results

Results: 1 - 24 next
open access

Diffusion of Slow Electrons in Gases

Description: The properties of electrons in a gas and an external electric field, e.g., agitation velocity, free path, energy lost per collision, and collision cross sections, were determined for electrons of energy less than 2 ev in a large number of gases. The computations were made from previously measured values for Townsend's energy factor or the ratio of electron agitation energy to molecule thermal energy. Results are presented for hydrogen, nitrogen, carbon dioxide, methane, ethylene, cyclopropane, and argon. (D.L.C.)
Date: October 24, 1961
Creator: Forester, D. W. & Cochran, L. W.
Partner: UNT Libraries Government Documents Department
open access

Transient Temperature Distributions in a Thermally Orthotropic Plate With Non-Uniform Surface Heating

Description: ent temperature variation in a thermally orthotropic plate which is subjected to an arbitrary heating rate distribution along one face with all other surfaces being insulated. Dimensionless temperature histories and distributions determined from this solution are presented for the special, but representative, case of a linearly varying heating rate distribution on plates with varying degrees of thermal orthotropy. These results establish quantitatively the value of a material with high planar and low normal thermal conductivities for applications where it is desired to maintain minimum temperatures on the rear or unheated surface of a heat shield when the heated surface is subjected to a very non-uniform heating rate distribution. The applicability of simplifying assumptions in analyzing such a system is discussed. Experimental temperature measurements in a pyrolytic graphite plate heated by an oxyacetylene flame were made to verify the analytical results. Achievement of satisfactory agreement wss found to be dependent upon use of thermal property values differing from those presently available for this material. This is not unusual in that differences in production methods are known to introduce substantial property variations in anisotropic materials such as pyrolytic graphite. (auth)
Date: June 1, 1961
Creator: Hornbaker, David Ross
Partner: UNT Libraries Government Documents Department
open access

Noise Considerations in Nuclear Pulse Amplifiers

Description: The effects of certain pulse-shaping networks on the signal-to-noise ratio of a nuclear pulse amplifier were considered. The shaping networks discussed are: equal RC-integrating and RC-differentiating time constant, single- delay-line clipper and RC integrator, and doubledelay-line clipper and RC integrator. The effects of these networks on the signal, when high count rates and overload pulses are present, were also considered. Equations and curves were developed for the energy resolution (signal-tonoise ratio) and resolving time (related to the ability to operate at high counting rates) of the networks. Experimental results are shown for the energy resolution of the types of pulse- shaping networks considered. (auth)
Date: December 20, 1961
Creator: Landis, D. A.
Partner: UNT Libraries Government Documents Department
open access

Essay for Orchestra

Description: The Essay for Orchestra combines three contemporary styles of melodic writing into sonata form. The exposition contains three themes. The first theme is a twelve-tone row. Unlike the usual approach to serial writing, the row is used in its original form throughout the piece and is developed by rhythmic alterations. The theme never occurs in its inversion or retrograde. The second theme of the exposition illustrates a chromatic type of melody. The third theme in the exposition is constructed of ascending and descending leaps of perfect fourths interspersed with leaps of thirds and short scale lines. The constant use of this theme throughout the development section provides the composition with a melodic unity.
Date: January 1961
Creator: Payne, Frank Lynn
Partner: UNT Libraries
open access

A Theoretical Study of the Transient Operation and Stability of Two-Phase Natural Circulation Loops

Description: Mathematical models of the time-dependent behavior of two-phase natural- circulation loops were used to predict the operation and to explain the unusual instability sometimes observed. The initial results obtained for a loop similar to the Univ. of Minnesota loop were used to formulate a more complex and accurate model, and the predicted transient behavior was in close agreement with the experimental results from the Minnesota loop. For a 300psia, high-pressure loop, unstable oscillatory behavior was predicted under certain conditions and stable behavior under others. Closed unstable regions rather than limits were predicted, and the specifications of stability in terms of a single parameter were found to be impossible. The great difference in oscillatory frequencies observed at low and high pressures was found to be due largely to the system geometry. The criterion for the absence of oscillations was found to be similar to one of the criteria for stability of chemical reaction systems. (D.L.C.)
Date: June 1, 1961
Creator: Garlid, K.; Amundson, N. R. & Isbin, H. S.
Partner: UNT Libraries Government Documents Department
open access

Dynamic Simulation of Multi-Pass Pressurized Water Nuclear Power Plants by Analog Computer Techniques

Description: A kinetic model of the primary loop of a multi-pass pressurized water reactor power plant is developed to evaluate, by analog computer techniques, the transient response characteristics under conditions of steam generator load and reactor control rod perturbations. Using the 2-pass 28 Mw(t) SM-2 reactor as a typical plant, transient behavior patterns are illustrated and examined for a variety of load inputs, variations in plant constants, and analog model simplifications. (auth)
Date: June 1, 1961
Creator: Brondel, J. O.
Partner: UNT Libraries Government Documents Department
open access

Solid State Neutron Detectors

Description: No Description Available.
Date: May 1, 1961
Creator: Murphy, J. F.
Partner: UNT Libraries Government Documents Department
open access

Ejection of Large Fragments in High-Energy Nuclear Reactions

Description: Several features of the production of Na/sup 24/ and Mg/sup 28/ fragments produced in the interaction of protons and He ions with Cu, Ag, Au, and U were investigated. Formation cross sections were determined for He ions of different energies between 320 and 880 Mev and for protons of 700 Mev. Thick- target recoil experiments were performed at bombarding energies of 0.7 and 3 Bev for protons, and 880 Mev for He ions. Also given are some recoil measurements of Na/sup 24/ from Al. Analysis of data obtained with target materials heavier than Al showed that for the bombarding energies used, Na/sup 24/ and Mg/sup 28/ are probably produced by the cleavage of the target nucleus into two heavy fragmerts. One of these fragments has a mass approximately equal to the mass Na 4 or Mg/6 and the other contains most of the remaining mass of the target nucleus. However, Na/sup 24/ and Mg/sup 28/ are very probably not slowly evaporated particles nor products of a slow fission process. The experimental information covering fragmentation from photographic emulsion studies and radiochemical studies is discussed. The various mechanisms proposed are considered and a new one suggested. According to this new mechanism Na/sup 24/ Mg/sup 28/ and the more energetic fragments observed in nuclear emulsions are ejected promptiy from the parent nucleus by very complex nucleon-nucleon cascades and by collective effects. (auth)
Date: September 1, 1961
Creator: Crespo, V. P.
Partner: UNT Libraries Government Documents Department
open access

Heavy-Ion Elastic Scattering

Description: The elastic scattering of C/sup 12/ ions from Ar, Fe, Ni, Ag/sup 107/ In, and Ta was measured as a function of angle, at a laboratory-system energy of 124.5 Mev with the Berkeley heavy-ion linear accelerator. The experimental equipment and techniques are discussed. The angular distributions show the same general behavior as previous heavy-ion elastic scattering experiments. The experimental data were analyzed with the semiclassical Blair model as modified by McIntyre. Very good agreement with experiment was obtained. The measurements were taken with 1% statistics in order to study the structure of the angular distributions in greater detail, because only by fitting the details in the structure was it possible to obtdin unambiguous sets of parameters. The parameters indicated a nuclear radius of 1.45A/sup 1/3/ x 10/sup -13/ cm, and a nearly constant surface thick ness of 1.6 x 10/sup -13/ cm. Total reaction cross sections were obtained. A rainbow-model analysis by Goldman of the data is given. Existing alpha - and heavy-ion scattering data were analyzed with the McIntyre model and compared with previous optical-model analyses of the same data. It was found that, by independent analysis, the two models give the same imaginary phase shifts for all partial waves. The real phase shifts are identical above a certain lth partial wave, but differ widely below this 1 value. It is shown that in the region of disagreement the real part of the phase shifts is irrelevant to the calculation of the cross section. (auth)
Date: April 17, 1961
Creator: Alster, Jonas
Partner: UNT Libraries Government Documents Department
open access

An Evaluation of the Firo-B Scale with Hospitalized Psychiatric Patients

Description: Concerning the present study, if in the test result of psychotic patients there is some distortion of reality concepts, as is generally expected, then their scores on any personality scale should vary considerably from norms established on the same test by "normal" subjects.
Date: January 1961
Creator: Ladd, Lawrence J.
Partner: UNT Libraries
open access

Social Criticism in the Works of John Steinbeck

Description: This thesis is a study of John Steinbeck's observations and opinions during twenty-eight years of writing about the relationships between people of difference economics and social classes.
Date: January 1961
Creator: Penner, Allen Richard
Partner: UNT Libraries
open access

Differences in Katherine Mansfield and Anton Chekhov as Short Story Writers

Description: The purpose of this study is to examine the extent of Katherine Mansfield's literary indebtedness to Anton Chekhov. Throughout the critical writing about Mansfield there are many suggestions that her work is similar to that of Chekhov, but, these allusions are, for the most part, vague in pointing out specific likenesses.
Date: January 1961
Creator: Rowland, John N.
Partner: UNT Libraries
open access

Relation of Dosage of Antiserum to Protection in Mouse Leukemia

Description: It is the purpose of this paper to attempt to confirm the work of Schlagenhauf and Ingebrigsten and to show the effects of repeated injections of guinea pig serum immunized with various strains of mouse leukemia.
Date: January 1961
Creator: Savage, Norman Lee
Partner: UNT Libraries
open access

The Cherokee Indians in the American Revolution

Description: It has been the purpose of this study to look closely at the history of Cherokee relations with the European powers and ascertain the reasons for the Indians' rarely severed loyalty to the British crown. The writer has attempted to determine the causes for ineffective Cherokee resistance to the westward movement of American settlers and absence of offensive action during the Revolution.
Date: January 1961
Creator: Starling, Susanne
Partner: UNT Libraries
open access

Properties of Order Relations and Certain Partly Ordered Systems

Description: The purpose of this paper is to present a study of partly ordered sets. It includes a rigorous development of relations based on the notion of a relation as a set, lattices, and theorems concerning the lattice of subgroups of a group.
Date: June 1961
Creator: Barros, David Nicholas
Partner: UNT Libraries
open access

Theory of Congruences

Description: This thesis presents a series of theorems along with proofs to establish a theory of congruences.
Date: June 1961
Creator: Green, Harold Rugby
Partner: UNT Libraries
open access

A Study of Active and Passive Immunity in Mouse Leukemia

Description: This thesis describes an attempt to increase the life span of mice after injection of a leukemic tumor. Fatty acids were used as a protecting agent against the leukemic tumor.
Date: June 1961
Creator: Hinkle, Dan C.
Partner: UNT Libraries
open access

The Effects of Group Discussion on Some Dimensions of Personality

Description: It is the basic hypothesis of this study that there exists a relationship between personal attitude and value changes and participation in group discussion. The purpose of this study will be an attempt to assess how some personality variables change as a result of group discussion.
Date: May 1961
Creator: Remeny, John Allen
Partner: UNT Libraries
open access

Quaternion Representation of Crystal Space Groups

Description: This investigation is designed to find quaternion operators which will generate selected space groups and which are more convenient to manipulate in some important types of problems.
Date: January 1961
Creator: Hufstetler, Thomas Jerry
Partner: UNT Libraries
open access

Dostoyevsky's American Reputation to 1930

Description: Undoubtedly, Dostoyevsky's influence upon the novel is great, but, even yet, few concrete studies have been made and no full-length study has been published. It is hoped that this account of Dostoyevsky's reputation in America during the 1920's will be of assistance in the greater task of tracing Dostoyevsky's influence.
Date: June 1961
Creator: Lacy, Dallas L.
Partner: UNT Libraries
open access

The Use of the Mask in the Plays of Eugene O'Neill

Description: The purpose of this thesis is to indicate the use of the mask by Eugene O'Neill. It is probably possible to say that the mask has been used or implied in all of O'Neill's works, but this thesis will be confined to discussion of the works in which the mask or the implication of the mask is specifically evident.
Date: June 1961
Creator: Rasco, Roger Curtiss
Partner: UNT Libraries
Back to Top of Screen