Report issued by the U.S. Bureau of Mines on the study of oil recovery through gas-injection techniques. The report discusses these secondary oil recovery methods in Cabin Creek field in West Virginia. This report contains maps and tables.

From introduction: Silicon carbide is being considered as a basis material for nonmetallic fuel elements because of its high thermal conductivity, low nuclear cross section, high resistance to thermal rupture, and high degree of stability at high temperature in air. A requirement of the fuel elements is that they be thin and have as low porosity as possible. One shape of element under consideration is 0.050 to 0.070 inch thick by a few inches in width and breadth.

Abstract: "The amount of hydrogen normally present in zirconium and zirconium alloys suffices to reduce their ductility greatly in an impact test at room temperature, after slow cooling from 600 F. Quenching from 600 F or above gives high impact strength, as does removal of hydrogen by high-temperature vacuum annealing. This report discusses the evidence on hydrogen embrittlement, the diffusion, solid solubility, and equilibrium pressure of hydrogen of hydrogen in zirconium, the microstructure, and the effects of hydrogen and heat treatment on the mechanical properties of zirconium."

This quarterly progress report details ongoing work at the Oak Ridge National Laboratory as part of the Aircraft Nuclear Propulsion Project. Topics of discussion include reactor theory and design, shielding research, materials research, appendixes with information on ongoing analytical chemical studies.

From summary: "The hazards due to possible chemical explosion and detonation of the dissociation gases in homogeneous-reactor systems have been considered."

"This symposium is concerned with the basic aspects of radiation effects. When we turn to the genetic effects of radiation in mammals, there are so few aspects on which there is any information that the problem of sorting out the fundamental findings has hardly arisen. In this paper it will, therefore, be possible to survey most of what is known and pass on to a consideration of what is needed next. Since one of the purposes of this symposium is an interchange of views between investigators in different fields, an attempt will be made to avoid technical details. Among the practical needs in mammalian radiation genetics is a pressing one for more data on which to base estimates of the genetic hazards of radiation in man. The present paper will be concerned largely with this problem. Our own work is directed primarily in this direction, our objective being to uncover some of the basic facts in at least one mammal-the mouse. Before discussing the experimental work, however, it seems desirable to consider some of the general features of the genetic hazard of radiation."

From summary: "The influence of the structure of phosphate esters on the distribution coefficient of uranium between solutions of these esters in carbon tetrachloride and aqueous nitrate solutions has been studied. Esters of secondary alcohols showed higher distribution coefficients than primary alcohols. Phenyl esters extracted less uranium than alkyl esters, and the presence of other negative groups also resulted in less extraction. Compounds containing carbon to phosphorus bonds gave higher distribution coefficients than the corresponding esters, and the distribution coefficients increased with the number of such carbon to phosphorus bonds. Tributyl phosphine oxide (with three carbon to phosphorus bonds) showed high distribution coefficients with many salts, including uranyl nitrate, uranyl sulfate, uranyl chloride, thorium nitrate, plutonium (IV) nitrate and some of the fission products in nitrate solution. It is planned to study these and similar compounds further."

This quarterly progress details the ongoing work of the Protective Equipment Evaluation Program at the Oak Ridge National Laboratory. Topics discussed include aerosol generation, penetration studies, particle size measurement, and an appendix with analytical methods.

From introduction: "The tube arrangement covered in this report was proposed in June, 1950, as a means of halving the weight and volume required for the heat exchanger. Ideally, the pressure drop across this arrangement should be little more than that required to overcome the skin friction on the tube surfaces. If the pressure drop across the tube spacers and in the cross-flow regions can be kept low, this ideal can be approached. much of the test work covered in this report was devoted to this phase of the problem."

From abstract: "This report presents the laboratory development of the MTR-RaLa Process for the production of barium140 from Materials Testing Reactor assemblies." The laboratory studied four possible chemical schemes with the final process being chosen "on the basis of chemical yield and purity of product, ease of recovery of uranium235, simplicty of equipment, and overall time required for processing" (from introduction).

The following report describes the process to determine the method for determination of americium in the presence of plutonium and uranium.

Report containing results of a study regarding concentration of radioiodine in edible plants fed to animals.

The following report investigates tests on diffusion length and contamination performed on graphite laid up in 105-DR and 105-H piles.

Report describing the effects of pile irradiation on fuel materials and coil springs for the Submarine Intermediate Reactor. The investigation was called for by Hanford Irradiation Request No. 79. Results of investigation are detailed in the report.

The following report provides complete data and test procedure from hot water corrosion tests of type 502 stainless steel.

This report presents data recorded during a program made to improve uranium slug quality in January, 1952, to determine what improvements could be made in the welding process.

"The split reactor of the Critical Experiment is analyzed, using a single-energy group-diffusion approximation. A further approximation is introduced in that the two halves of the reactor are treated as a parallelopipeds rather than the half-cylinders. The reactivity of the reactor is obtained as a function of the separation of the two halves, both for the 'standard' uranium concentration and for various greater concentrations."

"Comparisons have been made of the shock phenomena and drag-rise increments for representative wing and central-body combinations with those for bodies of revolution having the same axial developments of cross-sectional areas normal to the airstream. On the basis of these comparisons, it is concluded that near the speed of sound the zero-lift drag rise of a low-aspect-ratio thin-wing and body combination is primarily dependent on the axial development of the cross-sectional areas normal to the airstream. It follows that the drag rise for any such configuration is approximately the same as that for any other with the same development of cross-sectional areas" (p. 519).

Report presenting experimental studies to evaluate some of the effects of parameters such as jet velocity, density, and turbulence level as well as jet size, on the noise generated by subsonic jets. Results regarding model jets, comparison of model and engine data, and general considerations are provided.

Report presenting a study of the wear and sliding friction properties of a number of nickel alloys operating against hardened SAE 52100 steel. The alloys included L nickel, wrought monel, cast monel, cast modified H monel, cast S monel, Invar, Ni-Resist 3, and Nichrome V.

Report presenting a study of wear and sliding friction properties of a number of nickel alloys operating against hardened SAE 52100 steel. The alloys were cast beryllium nickel, heat-treated beryllium nickel, cast Inconel, Nimonic 80, Inconel X, Refractalloy 26, and Discaloy. Results regarding the wear of unlubricated surfaces, friction of lubricated surfaces, x-ray diffraction study of wear debris, and the practical significance are provided.

Note presenting several approximate methods for calculating lift distributions at subsonic speeds, which are combined and extended to form a simple step-by-step procedure for calculating symmetric and antisymmetric lift distributions for arbitrary angle-of-attack conditions on swept and unswept wings. The results obtained by the method compare favorably with those obtained by more time-consuming theories.

"An investigation has been made of the elastic stability of an idealized box beam with longitudinally stiffened covers connected by posts and subjected to end moments and axial loads. Stability criterions which give the axial stiffness of the posts required to achieve desired stress values in the box-beam covers are derived" (p. 1).

Report presenting flight testing of a commercially available flight indicator that combines heading, bank-angle, fuselage-pitch-attitude, and potentially altitude and radio-aid information in order to determine its suitability for helicopter instrument flying. The indicator was installed in the instrument panel of a helicopter meant for blind flying and was evaluated by performing prescribed maneuvers with conventional instruments and the combined-signal flight indicator. The indicator was found to result in less fatigue to the pilot and to require less concentration.