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A preliminary study of the preparation of slurry fuels from vaporized magnesium

Description: Slurry fuels containing extremely small particles of magnesium were prepared by concentrating the dilute slurry product resulting from the shock-cooling of magnesium metal vapors with a liquid hydrocarbon spray. A complete description of the equipment and procedure used in preparing the fuel is given. Ninety-five percent by weight of the solid particles formed by this process passed through a 100-mesh screen. The particle-size distribution of the screened fraction of one run, as determined by sedimentation analysis, indicated that 73 percent by weight of the metal particles were finer than 2 microns in equivalent spherical diameter. The purity of the solid particles ranged as high as 98.9 percent by weight of free magnesium. The screened product was concentrated by means of a bowl-type centrifuge from 0.5 to more than 50 percent by weight solids content to form an extremely viscous, clay-like mass. By addition of a surface active agent, this viscous material was converted into a pumpable slurry fuel.
Date: February 4, 1954
Creator: Witzke, Walter R; Prok, George M & Walsh, Thomas J
Partner: UNT Libraries Government Documents Department

A preliminary study of the prevention of ice on aircraft by the use of engine-exhaust heat

Description: An investigation was made in the N.A.C.A. ice tunnel at air temperatures from 20 degrees to 28 degrees Fahrenheit and at a velocity of 80 miles per hour to determine whether ice formations on a model wing could be prevented by the use of the heat from the engine-exhaust gas. Various spanwise duct systems were tested in a 6-foot-chord N.A.C.A. 23012 wing model. The formation of ice over the entire wing chord was prevented by the direct heating of the forward 10 percent of the wing by hot air, which was passed through leading-edge ducts. Under dry conditions, enough heat to maintain the temperature of the forward 10 percent of the wing at about 200 degrees Fahrenheit above that of the ambient air was required for the prevention of ice formation. The air temperature in the ducts that was necessary to produce these skin temperatures varied from 360 degrees to 834 degrees Fahrenheit; the corresponding air velocities in the duct were 152 and 45 feet per second. Ice formations at the leading edge were locally prevented by air that passed over the interior of the wing surface at a velocity of 30 feet per second and a temperature of 122 degrees Fahrenheit.
Date: June 1, 1939
Creator: Rodert, Lewis A
Partner: UNT Libraries Government Documents Department

Preliminary Summary of a Reconnaissance for Uranium in the Alaska Railroad-Iliamna Region During 1951

Description: From abstract: Radiometric reconnaissance in several districts of the Alaska Railroad-Iliamna region during 1951 found no radioactive material in excess of 0.002 percent equivalent uranium associated with certain lode deposits that previously were deemed favorable for the occurrence of uranium because they contain mineral assemblages similar to uranium-producing lodes elsewhere.
Date: December 1951
Creator: Tolbert, Gene E. & Nelson, A. E.
Partner: UNT Libraries Government Documents Department

Preliminary Summary of Reconnaissance for Uranium in Arizona

Description: From introduction: A reconnaissance of Arizona uranium deposits was started in October 1950 and continued through April 1951. A total of six man--months was spent by H. C. Granger, E. P. Kaiser, and J. W. Adams. About 40 properties were examined and, of these, six were mapped by plane-table method and six were sketch-mapped. This reconnaissance was not intended as a complete evaluation of all Arizona deposits; other areas and occurrences were not examined during the investigations and are not discussed in this report.
Date: August 1951
Creator: Granger, Harry C.
Partner: UNT Libraries Government Documents Department

Preliminary Summary of Reconnaissance for Uranium in Southeastern Alaska During 1951

Description: From abstract: Radiometric reconnaissance during the summer of 1951 of 47 abandoned lode mines and prospects in the predominantly mesothermal mineral belt in the central and southern parts of southeastern Alaska revealed radioactivity in excess of 0.005 percent equivalent uranium at only one locality.
Date: 1951
Creator: Houston, J. R.
Partner: UNT Libraries Government Documents Department

Preliminary Summary of Reconnaissance for Uranium in the Gulf of Alaska Region During 1951

Description: Abstract: No radioactive material in excess of 0.002 percent equivalent uranium was found during 1951 in a reconnaissance of possibly favorable lode deposits in the Nuka Bay, Moose Pass-Hope, and Girdwood areas of the Gulf of Alaska region.
Date: December 1951
Creator: Nelson, A. E. & Tolbert, G. E.
Partner: UNT Libraries Government Documents Department

A Preliminary Summary Report of a Reconnaissance of Sandstone-Type Copper-Uranium Deposits in Parts of New Mexico, Colorado, Utah, Idaho, and Wyoming

Description: From introduction: The reconnaissance was made during the summer of 1951 by two field parties: (1) a reconnaissance in parts of Oklahoma, Texas, New Mexico, and Arizona by Russell Gibson, and (2) Geological Survey reconnaissance in parts of New Mexico,.Colorado, Utah, Idaho, and Wyoming (by the writers), the results of which are summarized in this report.
Date: December 1951
Creator: Gott, Garland B. & Erickson, Ralph Leroy
Partner: UNT Libraries Government Documents Department

Preliminary Survey of Icing Conditions Measured During Routine Transcontinental Airline Operation

Description: Icing data collected on routine operations by four DC-4-type aircraft equipped with NACA pressure-type icing-rate meters are presented as preliminary information obtained from a statistical icing data program sponsored by the NACA with the cooperation of many airline companies and the United States Air Force. The program is continuing on a much greater scale to provide large quantities of data from many air routes in the United States and overseas. Areas not covered by established air routes are also being included in the survey. The four aircraft which collected the data presented in this report were operated by United Air Lines over a transcontinental route from January through May, 1951. An analysis of the pressure-type icing-rate meter was satisfactory for collecting statistical data during routine operations. Data obtained on routine flight icing encounters from.these four instrumented aircraft, although insufficient for a conclusive statistical analysis, provide a greater quantity and considerably more realistic information than that obtained from random research flights. A summary of statistical data will be published when the information obtained daring the 1951-52 icing season and that to be obtained during the 1952-53 season can be analyzed and assembled. The 1951-52 data already analyzed indicate that the quantity, quality, and range of icing information being provided by this expanded program should afford a sound basis for ice-protection-system design by defining the important meteorological parameters of the icing cloud.
Date: December 16, 1952
Creator: Perkins, Porter J.
Partner: UNT Libraries Government Documents Department

Preliminary survey of propulsion using chemical energy stored in the upper atmosphere

Description: Ram-jet cycles that use the chemical energy of dissociated oxygen for propulsion in the ionosphere are presented. After a review of the properties and compositions of the upper atmosphere, the external drag, recombination kinetics, and aerodynamic-heating problems of an orbiting ram jet are analyzed. The study indicates that the recombination ram jet might be useful for sustaining a satellite at an altitude of about 60 miles. Atmospheric composition and recombination-rate coefficients were too uncertain for more definite conclusions. The ram jet is a marginal device even in the optimistic view.
Date: May 1, 1958
Creator: Baldwin, Lionel V & Blackshear, Perry L
Partner: UNT Libraries Government Documents Department