From abstract: An airborne radioactivity survey of a selected area in the Red Desert, Sweetwater County, Wyoming, containing outcrops of radioactive lignites and shales of known surface extent and uranium content, was flown on flight lines at three levels, respectively 250, 500, and 1,000 feet above the ground and spaced at one-quarter mile intervals. Measurements from three identical dual-channel radiation detectors were simultaneously recorded to obtain data at various distances from natural radioactive sources of known configuration. The radiation intensity measurements were fully corrected for all extraneous effects and were compiled as profiles of radiation intensity, as an isoradioactivity contour map, and as curves showing the relationship between radiation intensity and distance from the source.

Technical report investigating the distribution of rare earth elements between a liquid bismuth-uranium solution and fused KCI-LiCi mixtures. Report warrants further research on the liquid bismuth-uranium-fused salt system due to the benefit of continuous fission removal processes.

Technical report describing a rapid and quantitative radiochemical method for the analysis of neptunium (237). This method is based on the extraction of neptunium (IV) with thenoyl-trifluoracetone in xylene. Neptunium (237) is separated free from other alpha emitters and from non-radioactive interferences, and the method may be readily adapted to remote control. [From Abstract]

Technical report outlining the investigation of corrosion on MTR type fuel elements for the Shielding Reactor in filtered water. Report includes two basic types of protection: element pretreatment by either anodizing or alodizing, and solution control using nitric acid to maintain a pH of 5.5 to 6.5 or the addition of 60 ppm sodium chromate as an inhibitor. [From Abstract]

Technical report covering classified work of the Critical Experiments Program in the Physics Division for the period December 20, 1950 to March 20, 1951. Report outlines investigations of properties of critical assemblies composed of uranium and various reflectors and moderators, preliminary measurements of the effective energy for fission in the assembly. [From Introduction and Summary]

Report issued by the U.S. Bureau of Mines on the oil-shale operations at New South Wales, Australia in 1947. The methods, and types of equipment used are presented. The report includes maps, photographs, and illustrations of the oil-shale refinery.

Report issued by the U.S. Bureau of Mines on the estimates of known reserves of coking coal deposits in Armstrong County, Pennsylvania. The properties of coal and coal blends from the area are presented. The report includes tables and maps.

Report issued by the U.S. Bureau of Mines on the motor fuel sold in the U.S. during the winter of 1950-1951. Analysis of properties and trend characteristics of the fuel samples are presented. This report includes tables, graphs, and a map.

Note presenting static and fatigue tests made on 355-T6 sand-cast plate-type aluminum-alloy specimens incorporating holes, bosses, and ribs. In the static tests, the tensile strength of the plain plate-type specimen agreed within 3 percent with the strength of separately cast test bars. Of the design details studied, the unreinforced hole was the most effective stress-raiser for fatigue lives from 10,000 to 25,000,000 cycles.

Report presenting the development of a rapid approximate method of analysis for both compressible and incompressible, nonviscous flow through radial- or mixed-flow centrifugal compressors with arbitrary hub and shroud contours and arbitrary blade shape. The method is used with eight numerical examples for two-dimensional flow, covering a wide range of flow rate, impeller-tip speed, number of blades, and blade curvature.

Report presenting an investigation of the aerodynamic coefficients of various bodies located in a free-molecule-flow field. The bodies include a flat plate, a cylinder, a sphere, and a cone.

Report presenting a flight investigation on a twin-engine transport airplane to determine the strains associated with the dynamic behavior of the wing during flights through rough air. Flights were made in clear-air turbulence for different wing fuel loads and for two speed conditions at a range of altitudes. Results indicated that the bending strains per unit normal acceleration in gusts were approximately 20 percent higher than those in slow pull-ups for all measuring positions and flight conditions of the tests.

Note presenting testing of an autopilot sensitive to yawing acceleration, which was used to control four simulated airplane (mass-spring) configurations, and a series of bench tests to determine the response characteristics of the combinations.

Report presenting a prediction of the magnitude of temperature variation in order to detect the places of highest temperature and to determine the operating temperatures admissible for the material of which the heat exchanger is composed. Results regarding the temperature distribution in triangular passages, temperature distribution in rectangular passages, influence of velocity field on temperature field, and a comparison of Prandtl number 1 solution are provided.

Report presenting testing of NACA 64-series airfoil sections to determine the effect of boundary-layer control by means of suction through an airfoil chord on the pressure distribution, lift, and drag characteristics of two different types of airfoil sections. Substantial reductions in wake drag were obtained through a wide range of lift coefficients with relatively moderate flow coefficients and pressure-loss coefficients. Results regarding airfoil-section data and effect of boundary-layer control on lift-drag ratio are provided.

Note presenting a method of obtaining the flow of a nonviscous compressible fluid past arbitrary compressor or turbine blades between two neighboring surfaces of revolution. Satisfactory results were obtained by the method described in the investigation of the detailed flow variation of a compressible fluid past typical high-solidity, highly cambered thick turbine blades on a cylindrical surface.

Note presenting an approximate blade-element design method for compressible or incompressible nonviscous flow in high-solidity stators or rotors of axial-, radial-, or mixed-flow compressors, turbines, or two-dimensional cascades. The method is based upon channel-type flow between blade elements on a specified surface of revolution that lies between the hub and shroud and is concentric with the axis of the compressor turbine.

"A method is presented for the computation and graphic representation of a series of possible turbine designs for any specific application. The use of a preliminary design chart is suggested for determining the number of stages and the effects of exit whirl and annular-area divergence on possible configurations. A specific design chart can then be made to aid in the study of the relations between turbine radius ratio, diameter, and significant design parameters such as Mach numbers, turning angles, and blade root stresses" (p. 1).

Report presenting solutions for the lift and pitching moment on a two-dimensional flat plate undergoing a step variation in pitch or vertical displacement. The results are subject to the restrictions of linearized, compressible-flow theory.

Note presenting the development of the axial-momentum theory for compressible flow as a step in the formulation of a rational propeller theory for compressible flow. The simple theory neglects some properties but predicts flow conditions through a propeller that are significantly different from the conditions predicted by the incompressible-flow theory.

Report presenting a method for calculating the initial tangents of contours of constant destiny, pressure, and Mach number behind a curved, axially symmetric shock wave has been desired. Initial tangents of density contours are obtained that fair well into contours determined from interferograms for the flow about a sphere at Mach number 1.62. the flow field obtianed from the shock wave by the method of characteristics is compared with that obtained by interferometry.

"An experimental determination of the critical bending moment of a box beam stiffened by posts is described and discussed. The experimental buckling load is in good agreement with that given by theory. Since appreciable distortion of the beam cross section occurred before the buckling load was reached, modification of post construction by the use of several ribs may be necessary for maintenance of the rectangular shape of the cross section" (p. 1).

Report presenting an investigation to determine the ability of a vane mounted ahead of the nose of an airplane to give an indication of the average angle of attack over the entire wing span during flight through rough air. The main purpose was to determine the suitability of such a vane as a sensing device for an acceleration alleviator. The vane gives a sufficiently accurate measure of average angle of attack over the wing span to be used that way, but rapid fluctuations in angle of attack caused by turbulence would have to be filtered from the output.

Note presenting a discussion of supersonic flow against blunt bodies placed in boundary layers or wakes, which concludes that wedge-shaped or conical dead-air regions should form ahead of the body if part of the upstream velocity profile is subsonic and if the body is fairly thick relative to the initial boundary layer or wake thickness. For the intermediate range of body thicknesses, an analysis of the two-dimensional flow against blunt bodies mounted on a flat plate agreed quantitatively with experimental results in a range of Mach numbers.