From Introduction: "The problem of thrust increase for jet engines by air mixture to the exhaust jet was introduced into aviation techniques by the suggestions of Melot (ref.1). Due to a too general interpretation of several theoretical investigations of A. Busemann (ref.2), so far no practical use has been made of these suggestions. The following considerations show that, in the case of low-pressure mixing according to Melot's suggestions, probably no thrust increase of technical significance will occur for the flight speeds of interest (however, the low-pressure mixture is highly promising for ground test setups and for special power plants of relatively slow sea and land vehicles."

From Summary: "The author first sets forth some observations about the theory of models. Then he established certain general criteria for the construction of dynamically similar models in water and in air, through reference to the perfect fluid equations and to the ones pertaining to viscous flow. It is, in addition, pointed out that there are more cases in which the analogy is possible than is commonly supposed."

We have preliminarily reported the interpretation of our experimental results that the intensity of the spectrum at the maximum energy was zero. But, as reported in the second paper UCRL-1261 we found that the results may also be fitted to a different spectrum with finite intensity at the maximum energy. Quite recently, however, the most probable value for the mass of the p-meson has been revised by two independent groups based on two different experiments.

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Report presenting a review of available information on the behavior of brittle and ductile materials under conditions of thermal stress and thermal shock. A number of practical methods that have been used to minimize the negative effects of thermal stress and shock are provided.

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A Pu-Al alloy containing 4 at. % Ad showed no attack after exposure to purified NaK for one month at 400 deg C in the absence of any oxide. The same specimen and other Pu alloys, including pure Pu, showed marked deterioration in shorter exposures in the presence of oxide fllms from a welded stainless steel container. Pure U was found to be resistant in the presence of such oxides. (auth)

A plutonium-aluminum alloy containing 4 atom per cent aluminum showed no attack after exposure to purified NaK for one month at 400 C in the absence of any oxide. The same specimen and other plutonium alloys, including pure plutonium, showed marked deterioration in shorter exposure in the presence of oxide films from a welded stainless steel container. Pure uranium was resistant even in the presence of such oxides.

The procedures used in the complete and permanent disassembly of the Los Alamos Fast Reactor are described.

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The purpose of this work was to study reagents which might be effective in dissolving uranium oxide produced during slug failures in water-cooled reactor systems. An aspect of this problem which has subsequently become of primary importance is the solubility or transportability of the oxide in pure water.

Given three presumably identical lots of commercial, sintered, wrought molybdenum, the 1-hour recrystallization temperature of one lot remained above 2900 F by limiting the amount of effective restraining to 35 percent or less. Different recrystallization temperatures were obtained in various atmospheres, the highest in argon and the lowest in hydrogen. Metal thus fabricated and then stress-relieved possessed an ultimate tensile strength at room temperature within 10 percent of metal swaged 99 percent and also possessed equivalent ductility. At 1800 F, equivalent strength and ductility was obtained irrespective of the amount of swaging over the range of 10 to 99 percent.

Note presenting the velocity potentials, span loadings, and corresponding force and moment derivatives for a number of slender-tail arrangements performing a steady rolling motion at supersonic speeds. The method of analysis is based on an application of conformal-transformation techniques.

Report presenting experiments conducted to obtain information on heat transfer in turbulent, mixed-free- and -forced-convection flow. The investigation revealed that the total flow regime as characterized by its Reynolds and Grashof numbers can be subdivided into a forced-flow regime, a free-flow regime, and a mixed-free- and -force-convection regime.

Report issued by the U.S. Bureau of Mines regarding the restudy of iron-ore reserves in the Birmingham area to determine where increased production may be obtained in the area if and when required. The report includes tables, graphs, pictures and a map.

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Note presenting an investigation of the principal high-speed planing characteristics for a prismatic surface with an angle of dead rise of 0 degrees determined over a wide range of planing variables. Wetted length, resistance, center-of-pressure location, and draft were determined at speed coefficients ranging up to 25.0, beam loadings up to 87.3, and trims up to 30 degrees.

"An analytical solution has been obtained for the equations of motion of water droplets impinging on a wedge in a two-dimensional supersonic flow field with a shock wave attached to the wedge. The closed-form solution yields analytical expressions for the equation of the droplet trajectory, the local rate of impingement and the impingement velocity at any point on the wedge surface, and the total rate of impingement. The analytical expressions are utilized to determine the impingement on the forward surfaces of diamond airfoils in supersonic flow fields with attached shock waves" (p. 1).

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From introduction: This report details a project to conduct exploratory live-bait fishing in the central Pacific.

Report issued by the U.S. Bureau of Mines on the motor fuels sold during the winter of 1952-53. The characteristics of the fuels sold, and the regions they were sold in are listed. This report includes tables, and maps.

The results of a rocket vehicle study indicate that nuclearpowered rocket vehicles will be lighter than comparable chemically powered vehicles for vehicle velocities greater than 15,000 ft/sec with payload weights of 1000 to 10,000 lb, or for vehicle velocities greater than 7000 ft/sec with payload weights greater than 10,000 lb. The reactor core design study shows that high reactor core bulk power densities might be achieved without an undue gas pressure drop across the reactor or an excessive temperature drop from the fuel element to the gas. The best core design appears to be one that utilizes thin, parallel, solid graphite plates as the heattransfer elements. Since the propellant gases are predominantly hydrogen, the use of graphite as the basic structural material will require the development of a hydrogenresistant coating to be applied to the surfaces of the graphite heat-transfer elements of the reactor core in order to inhibit chemical reactions between the gas and the graphite. The feasibility of the reactor core designs considered thus depends on the efficacy of the protective coatings proposed for the graphite heat-transfer elements. Thus the first step in a program of development of a nuclear rocket should be an experimental investigation of protective …

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