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The resistance to the steady motion of small spheres in fluids

Description: There seems to be little reliable information conveniently available as to the resistance encountered by small spheres moving steadily at moderate speeds in fluids. The present paper, while presenting nothing new in the way of either theory or data, has three objects: first to show that published data are sufficient to furnish approximate information; second to present this information in form convenient for computation; and, third to indicate where further research is needed.
Date: February 1, 1926
Creator: Castleman, R A
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resolution of annealing experiments for the study of nonequilibrium states

Description: The two techniques for conducting annealing experiments for the purpose of determining the distribution of atoms of a solid among non equilibrium states are considered. Related definitions for resolving power for annealing with steadily rising temperature and for annealing at a series of fixed temperatures are given. The necessary separation of activation energies for the resolution of two different non equilibrium states is found to be greater in the case of a steadily rising temperature, but of the order of 10 percent of the activation energy for both techniques. The resolving power in the case of a steadily rising temperature is independent of the rate of temperature rise.
Date: September 27, 1951
Creator: Schwed, Philip
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resonance sound absorber with yielding wall

Description: A single-sheet resonance system for normal incidence of sound was investigated to study in detail the effect of sympathetic vibration of the resonator front wall on sound absorption.
Date: May 1, 1951
Creator: Rzhevkin, S N
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resonance vibrations in intake and exhaust pipes of in-line engines III : the inlet process of a four-stroke-cycle engine

Description: Using a previously developed method, the boundary process of four-stroke-cycle engines are set up. The results deviate considerably from those obtained under the assumption that the velocity fluctuation is proportional to the cylinder piston motion. The deviation is less at the position of resonance frequencies. By the method developed, the effect of the resonance vibrations on the volumetric efficiency can be demonstrated.
Date: October 1, 1940
Creator: Lutz, O
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resonance vibrations of aircraft propellers

Description: On the basis of the consideration of various possible kinds of propeller vibrations, the resonance vibrations caused by unequal impacts of the propeller blades appear to be the most important. Their theoretical investigation is made by separate analysis of torsional and bending vibrations. This method is justified by the very great difference in the two natural frequencies of aircraft propeller blades. The calculated data are illustrated by practical examples. Thereby the observed vibration phenomenon in the given examples is explained by a bending resonance, for which the bending frequency of the propeller is equal to twice the revolution speed.
Date: February 1, 1932
Creator: Liebers, Fritz
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resource Recovery from Municipal Solid Waste

Description: From Introduction: "The report describes the products recovered from incarnated and raw refuse and research in upgrading, refining and/or utilizing the various metal and mineral products."
Date: unknown
Creator: Stanczyk, Martin H. & DeCesare, Roger S.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Resource Recovery Management Model: Overview

Description: Abstract: This document provides an overview of the Resource Recovery Management Model which has been developed by the U.S. Environmental Protection Agency to assist regional, state, and local officials in developing plans, reaching decisions, and managing and conducting procurements for resource recovery facilities and services.
Date: September 1979
Item Type: Report
Partner: UNT Libraries Government Documents Department

Respiratory Protective Devices Approved by the Bureau of Mines as of December 31, 1968: A Revision of Information Circular 8281

Description: Report issued by the U.S. Bureau of Mines discussing a revision on the breathing devices approved for use in mines and mineral industries. As stated in the abstract, "this publication lists the respiratory protective devices approved by the Bureau of mines as of December 31, 1968, and the names and addresses of their manufacturers" (p. 1). This report includes tables.
Date: 1969
Creator: Schutz, R. H. & Kloos, E. J.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Response of a Rotating Propeller to Aerodynamic Excitation

Description: The flexural vibration of a rotating propeller blade with clamped shank is analyzed with the object of presenting, in matrix form, equations for the elastic bending moments in forced vibration resulting from aerodynamic forces applied at a fixed multiple of rotational speed. Matrix equations are also derived which define the critical speeds end mode shapes for any excitation order and the relation between critical speed and blade angle. Reference is given to standard works on the numerical solution of matrix equations of the forms derived. The use of a segmented blade as an approximation to a continuous blade provides a simple means for obtaining the matrix solution from the integral equation of equilibrium, so that, in the numerical application of the method presented, the several matrix arrays of the basic physical characteristics of the propeller blade are of simple form, end their simplicity is preserved until, with the solution in sight, numerical manipulations well-known in matrix algebra yield the desired critical speeds and mode shapes frame which the vibration at any operating condition may be synthesized. A close correspondence between the familiar Stodola method and the matrix method is pointed out, indicating that any features of novelty are characteristic not of the analytical procedure but only of the abbreviation, condensation, and efficient organization of the numerical procedure made possible by the use of classical matrix theory.
Date: January 21, 1949
Creator: Arnoldi, Walter E.
Item Type: Report
Partner: UNT Libraries Government Documents Department

The response of an airplane to random atmospheric disturbances

Description: The statistical approach to the gust-load problem which consists in considering flight through turbulent air to be a stationary random process is extended by including the effect of lateral variation of the instantaneous gust intensity on the aerodynamic forces. The forces obtained in this manner are used in dynamic analyses of rigid and flexible airplanes free to move vertically, in pitch, and in roll. The effect of the interaction of longitudinal, vertical, and lateral gusts on the wing stresses is also considered.
Date: April 1, 1957
Creator: Diederich, Franklin W
Item Type: Report
Partner: UNT Libraries Government Documents Department

The response of an airplane to random atmospheric disturbances

Description: The statistical approach to the gust-load problem, which consists in considering flight through turbulent air to be a stationary random process, is extended by including the effect of lateral variation of the instantaneous gust intensity on the aerodynamic forces. The forces obtained in this manner are used in dynamic analyses of rigid and flexible airplanes free to move vertically, in pitch, and in roll. The effect of the interaction of longitudinal, normal, and lateral gusts on the wind stresses is also considered.
Date: January 1, 1958
Creator: Diederich, Franklin W
Item Type: Report
Partner: UNT Libraries Government Documents Department

Response of Deep Two-Way-Reinforced and Unreinforced Concrete Slabs to Static and Dynamic Loading, Report 3: Static Tests of Deep Slabs Having a Span-to-Thickness Ratio of 4.12

Description: Partial abstract: "The objective of the investigation reported herein was to obtain laboratory response data for deep, two-way-reinforced and plain concrete slabs subjected to static overpressures in order to determine the response analysis necessary to analyze the target vulnerability of such structures under both active and passive defense situations" (p. 4).
Date: November 1969
Creator: Cole, K. M.; Albritton, Gayle E. & Beavers, James E.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Response of Dual-Purpose Reinforced-Concrete Mass Shelter

Description: From introduction: The primary objective of Project 30.2 was to evaluate the protection afforded by a reinforced-concrete dual-purpose underground parking garage and personnel shelter against effects of a nuclear detonation.
Date: September 15, 1962
Creator: Cohen, Edward; Laing, E. & Bottenhofer, A.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Response of Protective Vaults to Blast Loading

Description: A reinforced-concrete steel-plate-lined vault and steel vault door were exposed to a nuclear detonation (shot Priscilla, about 37 kt, balloon suspended, at 700 ft) at the predicted 75-psi peak incident pressure level (1150 ft from Ground Zero). The vault was designed by the ultimate-strength theory to utilize the additional strain energy available in the elastoplastic and plastic ranges. Flexural and thrust capacities were determined, and shear capacity was computed. It was established that above-ground structures can be designed and constructed to survive the pressure levels experienced by this structure. The vault and door provided adequate blast and thermal protection for normal usage, and the structure was adequate to resist overturning and excessive sliding under conditions of the test.
Date: May 28, 1962
Creator: Cohen, Edward; Laing, E. & Bottenhofer, A.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Response to Secondary Antigenic Stimulus After Whole Body X-Irradiation in the Beagle

Description: From Abstract: "The results of the administration to healthy beagles of a secondary antigenic stimulus (booster dose) of Leptospira canicola and infectious canine hepatitis virus (ICH) are reported." From Introduction: "The results, using animals immunized with leptospira and infectious canine hepatitis virus (ICH) and exposed to x-irradiation, are reported."
Date: September 1964
Creator: Pindak, F. F.; Stara, J. F.; Clapper, W. E. & Clapper, W. E.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate

Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
Date: January 1, 1942
Creator: Lundquist, Eugene E. & Stowell, Elbridge Z.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate, Special Report

Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
Date: May 1, 1941
Creator: Lundquist, Eugene E. & Stowell, Elbridge Z.
Item Type: Report
Partner: UNT Libraries Government Documents Department

A restricted list of aircraft materials research projects

Description: This report contains a selected list of Government sponsored research projects on related aircraft materials in effect during the calendar year 1947. Information is contained on titles, description, sponsoring and conducting agencies.
Date: May 4, 1948
Item Type: Report
Partner: UNT Libraries Government Documents Department

Results obtained during accelerated transonic tests of the Bell XS-1 airplane in flights to a Mach number of 0.92

Description: Results are presented of tests up to a Mach number of 0.92 at altitudes around 30,000 feet. The data obtained show that the airplane can be flown to this Mach number above 30,000 feet. Longitudinal trim changes have been experienced but the forces involved have been small. The elevator effectiveness decreased about one-half with increase of Mach number from 0.70 to 0.87. Buffeting has been experienced in level flight but it has been mild and the associated tail loads have been small. No aileron buzz or other flutter phenomena have been noted.
Date: April 19, 1948
Creator: Drake, Hubert M; Mclaughlin, Milton D & Goodman, Harold R
Item Type: Report
Partner: UNT Libraries Government Documents Department