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482 Matching Results
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On the plane potential flow past a symmetrical lattice of arbitrary airfoils
Report presenting a theoretical investigation of the two-dimensional, incompressible potential flow past a symmetrical lattice of airfoils of arbitrary shape. Expressions are given for evaluation of the velocity and pressure distribution at the airfoil boundary.
Date:
January 1944
Creator:
Garrick, I. E.
System:
The UNT Digital Library
Critical combinations of shear and transverse direct stress for an infinitely long flat plate with edges elastically restrained against rotation
Report presenting an exact solution and a closely concurring approximate energy solution for the buckling of an infinitely long flat plate under combined shear and transverse direct stress with edges elastically restrained against rotation. An appreciable fraction of the critical stress in pure shear may be applied to the plate without any reduction in the transverse compressive stress necessary to produce buckling.
Date:
January 1945
Creator:
Batdorf, S. B. & Houbolt, John C.
System:
The UNT Digital Library
Compressible potential flow with circulation about a circular cylinder
Report presenting the potential function for flow, with circulation, of a compressible fluid about a circular cylinder, which is obtained in series form including terms of the order of M(exp 4) where M is the Mach number of the free stream. The equations are used to obtain pressure coefficient as a function of Mach number at a point on the surface of the cylinder for different values of circulation.
Date:
January 1944
Creator:
Heaslet, Max A.
System:
The UNT Digital Library
Derivation of charts for determining the horizontal tail load variation with any elevator motion
Report presenting equations relating the wing and tail loads are derived for a unit elevator displacement. The equations are converted into a nondimensoinal form and charts are given that can be used to predict wing- and tail-load-increment variation for any type of elevator motion and for degrees of airplane stability.
Date:
January 1943
Creator:
Pearson, Henry A.
System:
The UNT Digital Library
Icing Tests of Aircraft-Engine Induction Systems
Report presenting a program of icing tests conducted on an aircraft-engine induction system consisting of a Wright R-1820, G-200 blower section, Holley 1375-F carburetor and adapter, and specially built air scoop. The primary purpose of the investigation was to determine the effect of a number of possible factors on icing of engine-induction systems, including carburetor-air temperature, air-moisture content, water-droplet size, throttle opening, mixture ratio, rate of air flow, altitude, and others.
Date:
January 1943
Creator:
Kimball, Leo B.
System:
The UNT Digital Library
Single-Cylinder Oil-Control Tests of Porous Chrome Plated Cylinder Barrels for Radial Air-Cooled Engines
Report presenting a series of single-cylinder engine tests run to determine a satisfactory method of reducing oil consumption in radial air-cooled engines with flat-face compression rings as standard parts and equipped with cylinder barrels salvaged by porous chrome plating. Testing was conducted using porous chrome-plated cylinders with straight and choke bores with standard flat-face compression rings.
Date:
January 1946
Creator:
Johnson, Robert L. & Swikert, Max
System:
The UNT Digital Library
Investigation of the Electric Point and Gladstone Lead-Zinc Mines, Stevens County, Washington
Report issued by the Bureau of Mines regarding studies conducted on lead-zinc mines in Stevens County, Washington. As stated in the introduction, "this report presents the factual data obtained from the trenching and sampling operations" (p. 1). This report includes tables, maps, and illustrations.
Date:
January 1949
Creator:
Cole, John W.
System:
The UNT Digital Library
Investigation of the Zinc-Lead Deposits in Horizons Below the Grand Falls Chert, Galena District, Cherokee County, Kansas
Report issued by the Bureau of Mines over studies conducted on the zinc-lead deposits in Cherokee County, Kansas. As stated in the introduction, "the purpose of this report is to present the factual data derived from both the preliminary examination and the subsequent field work." (p. 3). This report includes tables, and maps.
Date:
January 1949
Creator:
Ruhl, Otto & Ballinger, Homer J.
System:
The UNT Digital Library
Investigation of the Sheep Creek Iron Deposits Meagher County, Montana
Report issued by the Bureau of Mines regarding studies conducted on iron deposits located in Meagher County, Montana. As noted in the introduction, "details of geology, sampling, and beneficiation tests are presented in this report" (p. 1). This report includes tables, maps, and illustrations.
Date:
January 1949
Creator:
Reed, Glenn C.
System:
The UNT Digital Library
National Motor-Gasoline Survey: Summer 1947
Report issued by the Bureau of Mines on the motor-fuels sold during the summer months of 1947. The types of fuels sold, and characteristics of the fuel samples obtained are listed. This report includes tables, and graphs.
Date:
January 1948
Creator:
Blade, O. C.
System:
The UNT Digital Library
Georgia Iron Deposits, Cherokee, Bartow, Floyd, and Polk Counties (In Two Parts): Part I
Report issued by the Bureau of Mines over exploration of iron ore deposits in four counties in Georgia. The physical features, geology, and analysis of ore samples are presented. This report includes tables, and maps.
Date:
January 1948
Creator:
Lewiecki, Walter T.
System:
The UNT Digital Library
Georgia Iron Deposits, Cherokee, Bartow, Floyd, and Polk Counties (In Two Parts): Part II
Report issued by the Bureau of Mines over exploration of iron ore deposits in four counties in Georgia. The work accomplished during the summer of 1945 in these deposits is presented. The report describes physical features, geology, and characteristics of the ore samples collected. This report includes tables, maps, and illustrations.
Date:
January 1948
Creator:
Robertson, Almon F.
System:
The UNT Digital Library
Use of Wetting Agents in Reducing Dust Produced by Wet Drilling in Basalt
Report issued by the U.S. Bureau of Mines on wet-drilling tests using two different wetting agents. Amounts are listed in the results. This report includes tables, and illustrations.
Date:
January 1943
Creator:
Johnson, John A.
System:
The UNT Digital Library
Trends in the Use of Energy in the Western States, With Particular Reference to Coal
Report issued by the U.S. Bureau of Mines on energy consumption in the western United States. A focus on coal as the primary energy source is presented. This report includes tables, graphs, maps, and illustrations.
Date:
January 1943
Creator:
Parry, V. F.
System:
The UNT Digital Library
National Motor-Gasoline Survey: Summer 1945
Report issued by the U.S. Bureau of Mines on the motor fuels sold in the summer of 1945. Analysis of the properties of fuel samples collected is presented. This report includes tables, graphs, and a map.
Date:
January 1946
Creator:
Blade, O. C.
System:
The UNT Digital Library
Nitrogen 12
N{sup 12} is shown to have a half life of 12.5 {+-} 1 milliseconds, and a positron upper limit of 16.6 {+-} 0.2 Mev. It is produced by the reaction C{sup 12}(p,n)N{sup 12}, and has a threshold proton energy of 20.0 Mev. This indicates that N{sup 12} is within about 200 Kev of being unstable against proton emission. The mass of N{sup 12} is 12.0228 {+-} 0.00015, and the beta transition is allowed.
Date:
January 19, 1949
Creator:
Alvarez, Luis W.
System:
The UNT Digital Library
200 Area monthly reports, July--December 1947
This document presents the monthly reports of the 200 area technical group for July--December, 1947. (KS)
Date:
January 1, 1947
Creator:
Stanford, R.E.L. & Christy, J.T.
System:
The UNT Digital Library
Methyl Methacrylate Casting Resin
Abstract: "This report describes work done to improve the casting characteristics of methyl methacrylete resin under CMR-6-18 authorization. The experimental program was initiated with the objectives of decreasing casting time, bubble formation and shrinkage. It has been found that by use of a common solvent for monomer and polymer concentration in monomer can be attained greater than any previously reported in preparation of a methacrylate casting resign. Incorporation of this greater amount of polymer has produced the desired effects. A bibliography of relevant literature is included to which reference is made in the text."
Date:
January 8, 1948
Creator:
Church, J. S. & Tyler, H. R.
System:
The UNT Digital Library
Polarographic Analysis of UNH in the IAW Stream
The following report describes two rapid, micro methods for the determination of UNH in Redox waste samples that had been developed fir the concentration range 0.2 to 100 g/l.
Date:
January 17, 1949
Creator:
Alkire, G. J. & Carson, W. N.
System:
The UNT Digital Library
Column and Plate Compressive Strengths of Aircraft Structural Materials: Extruded 0-1HTA Magnesium Alloy
Column and plate compressive strengths of extruded 0-1HTA magnesium alloy were determined both within and beyond the elastic range from tests of flat end H-section columns and from local instability tests of H-, Z-, and channel section columns. These tests are part of an extensive research investigation to provide data on the structural strength of various aircraft materials. The results are presented in the form of curves and charts that are suitable for use in the design and analysis of aircraft structures.
Date:
January 1947
Creator:
Heimerl, George J. & Niles, Donald E.
System:
The UNT Digital Library
Corrosion tests of a heated wing utilizing an exhaust-gas-air mixture for ice prevention
Report presenting an investigation of the exhaust of corrosive attack in an aluminum alloy wing employing an exhaust-gas-air mixture as a heating medium for ice prevention. There were no cases of structurally serious corrosion on either painted or plain specimens removed from the wing for detailed microscopic and metallurgic examination.
Date:
January 1949
Creator:
Holdaway, George H.
System:
The UNT Digital Library
Study by the Prandtl-Glauert method of compressibility effects and critical Mach number for ellipsoids of various aspect ratios and thickness ratios
From Summary: "By the use of a form of the Prandtl-Glauert method that is valid for three-dimensional flow problems, the value of the maximum incremental velocity for compressible flow about thin ellipsoids at zero angle of attack is calculated as a function of the Mach number for various aspect ratios and thickness ratios. The critical Mach numbers (within the accuracy of the Prandtl-Glauert method) of the various ellipsoids are also determined. The results indicate an increase in critical Mach number with decrease in aspect ratio which is large enough to explain experimental results on low-aspect-ratio wings at zero lift."
Date:
January 1949
Creator:
Hess, Robert V. & Gardner, Clifford S.
System:
The UNT Digital Library
Investigation of Meteorological Conditions Associated with Aircraft Icing in Layer-Type Clouds for 1947-48 Winter
Rotating-cylinder measurements of the icing conditions encountered in flight during the winter of 1947-48 are presented. Liquid water content, drop size, and temperature data are shown to be consistent with previously measured conditions and with proposed maximum icing conditions in supercooled layer-type clouds. Cumulative frequency graphs of meteorological parameters indicate the frequency with which various icing conditions have been encountered in the Great Lakes area and surrounding states.
Date:
January 1949
Creator:
Kline, Dwight B.
System:
The UNT Digital Library
Gust-tunnel investigation of a wing model with semichord line swept back 30 degrees
Report presenting tests in the gust tunnel of the 30 degree sweptback wing model to provide information on some of the problems encountered in the prediction of gust loads for airplanes incorporating swept wings. The results indicate that within the scope of the data and the values of gradient distance investigated, the maximum acceleration increment depends on the slope of the lift curve of an equivalent straight wing multiplied by the cosine of the angle of sweep and on the effect of gradual penetration of the sweptback wing into the gust.
Date:
January 1949
Creator:
Reisert, Thomas D.
System:
The UNT Digital Library