Serial/Series Title
NACA Research Memorandums
4,120
NACA Technical Notes
2,223
Atomic Energy Commission Reports
1,874
United States Geological Survey Reports
1,253
Trace elements investigations report
749
Hanford Works Reports
710
University of California Radiation Laboratory Reports
484
HW (Series)
475
Oak Ridge National Laboratory Reports
440
NACA Technical Reports
382
274 More
Degree Department
Degree Level
Country
States
Decade
Year
Month
12,489 Matching Results
Results open in a new window/tab.
The design, operation, and uses of the water channel as an instrument for the investigation of compressible-flow phenomena
Report presenting the results of several years of experience of operation of a small water channel, which has shown that the hydraulic analogy can be used successfully to demonstrate many two-dimensional compressible-flow phenomena.
Date:
January 1950
Creator:
Matthews, Clarence W.
Object Type:
Report
System:
The UNT Digital Library
Determination of plate compressive strengths at elevated temperatures
The results of local-instability tests of h-section plate assemblies and compressive stress-strain tests of extruded 75s-t6 aluminum alloy, obtained to determine flat-plate compressive strength under stabilized elevated temperature conditions, are given for temperatures up to 600 degrees F. The results show that methods available for calculating the critical compressive stress at room temperature can also be used at elevated temperatures if the applicable compressive stress-strain curve for the material is given.
Date:
1950
Creator:
Heimerl, George J. & Roberts, William M.
Object Type:
Report
System:
The UNT Digital Library
Diffusion and Production of Neutrons by Photon in D₂O
"The neutron yield resulting from the photo-disintegration of deuterium in heavy water was calculated in this report."
Date:
1950
Creator:
Greuling, E.; Levy, P. O.; Schweinler, Harold Constantine, 1922- & Soodak, Harry
Object Type:
Report
System:
The UNT Digital Library
Ditching Investigation of a 1/10-Scale Model of the Grumman F9F-2 Airplane, TED No. NACA DE 335
An investigation was made of a 1/10-scale dynamically similar model of the Grumman FgF-2 airplane to study its behavior when ditched. The model was landed in calm water at the Langley Tank No. 2 monorail. Various landing attitudes, speeds, and configurations were investigated. The behavior of the model was determined from visual observations, acceleration records, and motion-picture records of the ditchings. Data are presented in tabular form, sequence photographs, time-history acceleration curves, and plots of attitude and speed against distance after contact.
Date:
1950
Creator:
Fisher, Lloyd J. & McBride, Ellis E.
Object Type:
Report
System:
The UNT Digital Library
Ditching Investigation of a 1/14-Scale Model of the Northrop C-125 Airplane
"An investigation of a 1/14-scale dynamically similar model of the Northrop C-125 airplane was made to determine the ditching characteristics and proper ditching technique for the airplane. Various conditions of damage, landing attitude, flap setting, and speed were investigated. The behavior of the model was determined from visual observations, motion-picture records, and time-history deceleration records" (p. 1).
Date:
1950
Creator:
Fisher, Lloyd J. & Windham, John O.
Object Type:
Report
System:
The UNT Digital Library
Ditching Investigation of a 1/15-Scale Model of the Convair-Liner Airplane
A ditching investigation of a model of the Convair-Liner airplane was made to observe the behavior and determine the safest procedure for making an emergency water landing. The ditching model was designed and constructed by the National Advisory Committee for Aeronautics. Design information on the airplane was furnished by the Consolidated Vultee Aircraft Corporation. A three-view drawing of the airplane is shown. The investigation was made in calm water at the Langley tank no. 2 monorail.
Date:
1950
Creator:
Fisher, Lloyd J. & Thompson, William C.
Object Type:
Report
System:
The UNT Digital Library
Effect of horizontal tail on low-speed static lateral stability characteristics of a model having 45 degree sweptback wing and tail surfaces
Report presenting an investigation in the stability tunnel to determine the effects of changes in horizontal-tail size and location on the static lateral stability characteristics of a complete model with wing and tail surfaces having the quarter-chord line swept back 45 degrees. Available procedures for predicting the effect of the horizontal tail on directional stability were found to be unreliable when applied to swept-tail configurations.
Date:
January 1950
Creator:
Brewer, Jack D. & Lichtenstein, Jacob H.
Object Type:
Report
System:
The UNT Digital Library
The effects of variations in Reynolds number between 3.0 x 10sub6 and 25.0 x 10sub6 upon the aerodynamic characteristics of a number of NACA 6-series airfoil sections
Results are presented of an investigation made to determine the two-dimensional lift and drag characteristics of nine NACA 6-series airfoil section at Reynolds numbers of 15.0 x 10sub6, 20.0 x 10sub6, and 25.0 x 10sub6. Also presented are data from NACA Technical Report 824 for the same airfoils at Reynolds numbers of 3.0 x 10sub6, 6.0 x 10sub6, and 9.0 x 10sub6. The airfoils selected represent sections having variations in the airfoil thickness, thickness form, and camber. The characteristics of an airfoil with a split flap were determined in one instance, as was the effect of surface roughness. Qualitative explanations in terms of flow behavior are advanced for the observed types of scale effect.
Date:
1950
Creator:
Loftin, Laurence K., Jr. & Bursnall, William J.
Object Type:
Report
System:
The UNT Digital Library
Elastic and plastic buckling of simply supported solid-core sandwich plates in compression
From Summary: "A solution is presented for the problem of the compressive buckling of simply supported, flat, rectangular, solid-core sandwich plates stressed either in the elastic range or in the plastic range. Charts for the analysis of long sandwich plates are presented for plates having face materials of 24S-T3 aluminum alloy, 76S-T6 Alclad aluminum alloy, and stainless steel. A comparison of computed and experimental buckling stresses of square solid-core sandwich plates indicates fair agreement between theory and experiment."
Date:
1950
Creator:
Seide, Paul & Stowell, Elbridge Z.
Object Type:
Report
System:
The UNT Digital Library
The Enrichment of Lithium Isotopes by Ion Exchange
The following report analyzes experiments of partial separations of lithium using the method of ion exchange.
Date:
1950
Creator:
Gross, John H.
Object Type:
Report
System:
The UNT Digital Library
Erosion Studies at Parícutin, State of Michoacán, Mexico
From abstract: Paricutin is 320 kilometers west of Mexico City and is reached by air, rail, or paved highway to Uruapan, Michoacan, and thence by 37 kilometers of paved and dirt road to lava-destroyed San Juan Parangaricutiro, 5 kilometers north of the cone.
Date:
1950
Creator:
Segerstrom, Kenneth
Object Type:
Report
System:
The UNT Digital Library
The Extrusion of Beryllium
Abstract: "A method for the extrusion of beryllium into rods and tubing has been developed. The operation is carried out between 1500 and 1900 F and the billet is clad in a layer of soft iron to prevent contact between it and the die steals. Extruded beryllium has much more strength and ductility than cast metal due to the crystal refinement which occurs as a result of the fabrication operation."
Date:
1950
Creator:
Creutz, Edward Chester, {}
Object Type:
Report
System:
The UNT Digital Library
Fast Sweep & Scope
Technical drawing of signal generators for nuclear reactors.
Date:
1950?
Creator:
Titterton, E. W.
Object Type:
Technical Drawing
System:
The UNT Digital Library
Flight Experiences and Tests on Two Airplanes With Suction Slots
Memorandum presenting the flight tests of two airplanes with boundary-layer control are reviewed. The results for take-off and flight test measurements are reported. Suction proved to be an effective means of obtaining high lifts during flights.
Date:
January 1950
Creator:
Stüper
Object Type:
Report
System:
The UNT Digital Library
Floating characteristics of rudders and elevators in spinning attitudes as determined from hinge-moment-coefficient data with application to personal-owner-type airplanes
Report presenting a study of the available rudder and elevator hinge-moment-coefficient data in order to determine the floating characteristics of various types of rudders and elevators in spinning attitudes. Results regarding the rudder floating characteristics, elevator floating characteristics, and a comparison of several types of rudders and elevators are provided.
Date:
January 1950
Creator:
Bihrle, William, Jr.
Object Type:
Report
System:
The UNT Digital Library
Flutter of a uniform wing with an arbitrarily placed mass according to a differential-equation analysis and a comparison with experiment
A method is presented for the calculation of the flutter speed of a uniform wing carrying an arbitrarily placed concentrated mass. The method, an extension of recently published work by Goland and Luke, involves the solution of the differential equations of motion of the wing at flutter speed and therefore does not require the assumption of specific normal modes of vibration. The order of the flutter determinant to be solved by this method depends upon the order of the system of differential equations and not upon the number of modes of vibration involved. The differential equations are solved by operational methods, and a brief discussion of operational methods as applied to boundary-value problems is included in one of two appendixes. A comparison is made with experiment for a wing with a large eccentrically mounted weight and good agreement is obtained. Sample calculations are presented to illustrate the method; and curves of amplitudes of displacement, torque, and shear for a particular case are compared with corresponding curves computed from the first uncoupled normal modes.
Date:
1950
Creator:
Runyan, Harry L. & Watkins, Charles E.
Object Type:
Report
System:
The UNT Digital Library
Free-Space Oscillating Pressures Near the Tips of Rotating Propellers
"The theory is given for calculating the free-space oscillating pressures associated with a rotating propeller, at any point in space. Because of its complexity this analysis is convenient only for use in the critical region near the propeller tips where the assumptions used by Gutin to simplify his final equations are not valid. Good agreement was found between analytical and experimental results in the tip Mach number range 0.45 to two, three, four, five, six, on eight-blade propellers and for a range of tip clearances from 0.04 to 0.30 times the propeller diameter" (p. 785).
Date:
1950
Creator:
Hubbard, Harvey H. & Regier, Arthur A.
Object Type:
Report
System:
The UNT Digital Library
A Glossary of Uranium- and Thorium-Bearing Minerals
Glossary of minerals containing uranium and thorium. "In the index there are 325 entries which represent 81 species containing uranium and thorium as major constituents, 39 species containing small amounts of uranium and thorium, 29 species which should be tested for uranium and thorium, and 13 species which have been reported to contain impurities or intergrowths of uranium, thorium, or rare-earth minerals."
Date:
January 1950
Creator:
Frondel, Judith Weiss & Fleischer, Michael
Object Type:
Report
System:
The UNT Digital Library
Gust-Tunnel Investigation to Determine the Load at the Joint of a Coupled Airplane Configuration Encountering a Gust
"An investigation has been made in the Langley gust tunnel with two identical airplane models approximating 1/40-scale models of the B-29, coupled in tandem with a boom so that the individual centers of gravity were equidistant from the single coupling joint at the tail of the lead airplane. Time histories of the boom joint load were obtained as the models were flown through a gust. The results indicate that on a similar configuration involving airplanes the size of B-29 airplanes a load on the boom joint of 10,000 to 14,000 pounds could be induced by encountering a gust of 50 feet per second and having a gradient distance of 17 chords, at a forward speed of 380 feet per second and that the total load is extremely sensitive to the steadiness of flight that can be maintained with or without a gust" (p. 1).
Date:
January 1950
Creator:
Cahen, George L.
Object Type:
Report
System:
The UNT Digital Library
Heats of Formation of Some Aqueous Ions of Americium
Abstract: "The heats of formation of Pr-(+3) (aq.) and La-(+3) (aq.) have been measured in 1.5M HCl at 25 C. to be -165.9 +/- 0.9 kcal/mol and -167.0 +/- 0.7 kcal/mol, respectively. The heat of formation of Am-(+3) (aq.) under the same conditions was found to be -161.3 +/- 1.4 kcal/mol. The latter value made it possible to calculate the heat of formation of Am-(+4) (aq.) as -112.2 kcal/mol. It was impossible at this time to determine the heats of formation of AmO2+ (aq.) and AmO2++ (aq.)."
Date:
1950
Creator:
Lohr, Harold Russell
Object Type:
Report
System:
The UNT Digital Library
High-Sulfur Pittsburgh Coal: Upgrading in Southwestern Pennsylvania and Northern West Virginia
From Summary and Conclusions: "This report deals with upgrading to metal-lurgical standards of large reserves of high-sulfur Pittsburgh coal remaining in southwestern Pennsylvania and northern West Virginia."
Date:
1950
Creator:
Fraser, Thomas; Crentz, W. L. & Bailey, A. L.
Object Type:
Report
System:
The UNT Digital Library
High Voltage C.R.O.
Technical drawing of oscilloscopes in nuclear reactors.
Date:
1950?
Creator:
Titterton, E. W. & Voorhies, H. G.
Object Type:
Technical Drawing
System:
The UNT Digital Library
History of Premium Price Plan for Copper, Lead, and Zinc: 1942-47
Report issued by the U.S. Bureau of Mines discussing the Premium Price Plan of copper, lead, and zinc. The Premium Price Plan is described, and cost and production data is presented. This report includes tables, and illustrations
Date:
January 1950
Creator:
Olund, H. E. & Gustavson, S. A.
Object Type:
Report
System:
The UNT Digital Library
Icing-Protection Requirements for Reciprocating-Engine Induction Systems
Report presenting an investigation of the icing of aircraft-engine induction systems. Criterions for safe operation and for the design of new induction system are established through the investigation. The results were obtained from laboratory investigations of carburetor-supercharger combinations, wind-tunnel investigations of air scoops, multicylinder-engine studies, and flight investigations.
Date:
1950
Creator:
Coles, Willard D.; Rollin, Vern G. & Mulholland, Donald R.
Object Type:
Report
System:
The UNT Digital Library