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Air-Flow Behavior Over the Wing of an XP-51 Airplane as Indicated by Wing-Surface Tufts at Subcritical and Supercritical Speeds

Description: Report presenting the air-flow behavior over the wing of an XP-51 airplane including photographs of tufts attached to the wing surface and chordwise pressure distributions. A comparison of tuft studies from flight results are compared with results from wind-tunnel testing. Three types of flow were observed: steady flow, unsteady flow, and break-away flow are provided.
Date: April 24, 1947
Creator: Beeler, De E.
Partner: UNT Libraries Government Documents Department

Color Globes for Copper

Description: Color studies in gradations from dark to light are displayed on circles and spheres.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: unknown
Creator: Runge, Philipp Otto
Partner: UNT College of Visual Arts + Design

Крестьянский Союз в 1920-е годы и формирование крестьянской идентичности: модернизационный дискурс: The Peasant Union in the 1920s. The Formation of a Peasant Identity: Modernizing Discourse

Description: Book chapter discussing the Peasant Union in the 1920s, the formation of a peasant identity, and modernizing discourse.
Date: 2010
Creator: Velikanova, Olga V.
Partner: UNT College of Arts and Sciences

Shielding Against Gamma Rays, Neutrons, and Electrons From Nuclear Weapons: A Review and Bibliography

Description: Report discussing the problem of predicting dose rates and of estimating the effectiveness of shielding from radiations resulting from nuclear explosions. A number of calculations and supporting experiments regarding the penetration and diffusion of gamma rays, neutrons, and electrons through air and bulk materials are summarized. Indications are given of gaps in such input information. A selection of 485 references from the unclassified literature is presented, of which 388 are cataloged as to source geometry and energy, absorber material and configuration, type of data presented, and method of calculation or experimental technique. These cataloged references include radiation field studies ranging from the point-source infinite-medium situation up through such complicated geometries as foxholes, shelters, and conventional structures. The other references are of a general or review nature or contain input spectral data.
Date: February 24, 1964
Creator: Hubbell, J. H. & Spencer, L. V.
Partner: UNT Libraries Government Documents Department

Microbial actinomycete population studies in lacustrine substrates

Description: The discovery of the production of antibiotic materials by certain members of the Actinomycetales has stimulated the study of these organisms over the last two decades, raising them from a position of little significance to one of noticeable importance. These studies include investigations concerning the physiology and biochemistry of the actinomycetes.
Date: August 1968
Creator: Brothers, James Walker
Partner: UNT Libraries

Personnel Problems in Foremanship: Case Studies

Description: The purpose of this study is to supply additional case material for analysis and study by the potential and beginning foreman. Since it would be impossible to cover all possible situations, only selected cases are presented. The selected cases illustrate problems in foreman-to-employee relationships, foreman-to-foreman and staff-groups relationships, and foreman-to-superior relationships. In the interest of clarity, each case was analyzed as to key points covered or contained, principles illustrated by the case, and recommendations derived from the analysis.
Date: August 1961
Creator: Miller, Troy P.
Partner: UNT Libraries

Heat Capacity Lag in Gases

Description: Note presenting a review of the literature on the sonic studies of the problem of the excitation of molecular vibrations by collision. The theory on which the interpretation of almost all the sonic work has been based is discussed rather qualitatively in some detail. Results concerning techniques, principal experimental programs, and an interpretation of the results are provided.
Date: November 1951
Creator: Walker, Richard
Partner: UNT Libraries Government Documents Department

Flight measurements of the vibrations encountered by a tandem helicopter and a method for measuring the coupled response in flight

Description: Report presenting a discussion of flight-test and analysis methods for some selected helicopter vibration studies. The analytical methods described are based on the determination of the power spectral density of the force and of the response due to the force through use of analog frequency-analysis technique. Results regarding the coupled response with wood blades, coupled response with metal blades, comparison between flight and ground tests, comparison of flight results with theory, suggestions for refined flight-test technique, and natural-vibration measurements are provided.
Date: December 1956
Creator: Yeates, John E., Jr.
Partner: UNT Libraries Government Documents Department

Flight and analytical methods for determining the coupled vibration response of tandem helicopters

Description: Chapter one presents a discussion of flight-test and analysis methods for some selected helicopter vibration studies. The use of a mechanical shaker in flight to determine the structural response is reported. A method for the analytical determination of the natural coupled frequencies and mode shapes of vibrations in the vertical plane of tandem helicopters is presented in Chapter two. The coupled mode shapes and frequencies are then used to calculate the response of the helicopter to applied oscillating forces.
Date: 1957
Creator: Yeates, John E., Jr.; Brooks, George W. & Houbolt, John C.
Partner: UNT Libraries Government Documents Department

Visualization of rotor tip secondary flows with blade tip air discharge and suction in a low-speed turbine

Description: Smoke was used to visualize outer-wall secondary flows in a low-speed turbine utilizing rotor tip air discharge and suction. Photographs as well as visual observations of the effect of tip air discharge and suction were made by independently varying the direction and quantity of the tip air discharge and suction, and varying tip clearance, and main-stream air speed. In addition, the cross-sectional area of the hollow blade discharge opening was varied for the case of tip air discharge.
Date: August 17, 1956
Creator: Kofskey, Milton G. & Allen, Hubert W.
Partner: UNT Libraries Government Documents Department

Visualization study of secondary flows in turbine rotor tip regions

Description: Report presenting a visualization study using smoke to see the secondary-flow phenomena in the rotor-blade tip region of a low-speed turbine. Measurements of the factors affecting the flow patterns were recorded from visual observations. Results regarding a general description of the smoke patterns, shroud boundary-layer considerations, transition rotor tip speed, and high-speed-turbine operating conditions are provided.
Date: September 1955
Creator: Allen, Hubert W. & Kofskey, Milton G.
Partner: UNT Libraries Government Documents Department

A study of the effects of body shape on the vortex wakes of inclined bodies at a Mach number of 2

Description: Report presenting visual-flow studies made of the behavior of the vortices which form in the separated flow region in the lee of an inclined body of revolution. Generally, the configuration of vortices in the wake could be changed by varying the position of the crossflow separation lines along the sides of the body. Results regarding the effects of body expansion, effect of body cross-sectional asymmetry, Reynolds number effects, and effects of vortex configuration on body forces are provided.
Date: December 1, 1953
Creator: Gowen, Forrest E. & Perkins, Edward W.
Partner: UNT Libraries Government Documents Department

Preliminary investigation of molybdenum disulfide-air-mist lubrication for roller bearings operating to DN values of 1 x 10(exp 6) and ball bearings operating to temperatures of 1000 degrees F

Description: The effectiveness of molybdenum disulfide MoS2 as a bearing lubricant was determined at high temperature and at high speeds. A 1-inch-bore ball bearing operated at temperatures to 1000 F, a speed of 1725 rpm, and a thrust load of 20 pounds when lubricated only with MoS2-air mist. A 75-millimeter-bore cageless roller bearing, provided with a MoS2-syrup coating before operation, operated at DN values to 1 x 10(exp 6) with a load of 368 pounds.
Date: October 15, 1951
Creator: Macks, E. F.; Nemeth, Z. N. & Anderson, W. J.
Partner: UNT Libraries Government Documents Department

An analog study of the relative importance of various factors affecting roll coupling

Description: From Introduction: "In this study wide variations in many of the pertinent aerodynamic were investigated at subsonic and supersonic speeds. The effects of large changes in principal axis inclination and mass distribution are also included. The primary purpose of this paper is to summarize the information obtained from the analog calculations and to compare the results with the trends predicted from a slightly modified version of reference 2."
Date: April 24, 1956
Creator: Weil, Joseph & Day, Richard E.
Partner: UNT Libraries Government Documents Department

Simulator studies of a simple homing system

Description: Report presenting simulator studies of a homing missile pursuing a constant-velocity nonmaneuvering target. The missile dynamics in pitch and roll, seeker method of deflection and control, and the missile-target geometry were simulated to determine whether the method of control and detection in conjunction with the missile dynamics were feasible.
Date: October 6, 1955
Creator: Passera, Anthony L. & Garner, H. Douglas
Partner: UNT Libraries Government Documents Department