The ground-state wave function and energy of a finite system of interacting fermions are expanded in terms of multiple-particle excitations on an uncorrelated zero-order state. The resulting set of coupled equations constitutes a systematic variational generalization of Hartree-Fock theory. Comparison is made with many-body perturbation theory and it is shown that to any order the theory incorporates an infinite number of perturbation theory terms. Solutions of the equations for ground-state atomic systems are discussed and related to previous work using many-body perturbation theory. It is shown that the sums of perturbation terms necessary for convergence are automatically included in the equations for two-particle excitations. Application of the equations to open-shell atoms is described.

A unique mechanical drive system with associated transistorized circuitry has been developed to allow digital recording on magnetic tape at carrying data flow rates. The present system records on command at rates up to 40 characters per second with a packing density of 200 characters per inch. The output is on half-inch magnetic tape in a format compatible with conventional playback equipment.

Work reported includes: Chemical-Metallurgical Processing; Fuel Cycle Applications of Volatility and Fluidization Techniques; Calorimetry; Reactor Safety; Energy Conversion; and Determination of Nuclear Constants.

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The scintillation camera is a nonscanning instrument for displaying the distribution of radioactive isotopes. It can be used, for example, to show abnormalities in the thyroid gland with I-131, the size, shape and location of kidneys with Hg-203 Neohydrin or to locate brain tumors either with Hg-203 Neohydrin or with the new positron emitting agent, Ga-68 EDTA. For many applications, the scintillation camera has higher sensitivity than conventional isotope scanners, and will produce pictures in less time or with a smaller quantity of isotope present. Alternatively, it produces better pictures if the conventional dosage and exposure factors are retained. Because of the short exposure time, and because the scintillation camera is continuously sensitive to all areas within its field of view, it is well adapted to taking rapid sequences of still pictures or time-lapse motion pictures of subjects in which the distribution of radioactivity is changing. For example, time lapse pictures have been taken showing I-131 Rose Bengal Bengal being excreted from the liver of children with liver disease and of I-131 hippuran going through the kidneys of patients suspected of kidney disease.

A parabolic systematics approach was used to construct an extended mass table with very small deviations between the calculated and known masses. The masses were obtained from a formula parabolic in 2 after inclusion of the necessary considerations. For 763 masses, the standard deviation was 0.35 Mev, and the largest deviation was 2 Mev. (D.C.W.)

The evaluation of the data generated during the full power and limited endurance tests of the ML-1 mobile nuclear power plant indicates that the reactor performs in accordance with the design specifications. During the 101 hr test period, the reactor attained a maximum power of 3.44 Mw( and 247 kw(e) was measured at the output shaft of the turbine-compressor set. No operating limits were exceeded during these tests and all systems performed satisfactorily Except for the known performance deficiency of the turbinecompressor set, which prevented the attainment of design output power, no operational, stability, or control problems were encountered. All test objectives were achieved and the tests were considered completely successful. (auth)

This second edition is based on data available on March 15, 1961. Sections on constants necessary for the interpretation of experimental data and on digital computer programs for reactor design and reactor physics have been added. 1344 references. (D.C.W.)

A discussion is presented of an investigation of the flow characteristics in a horizontal, converging-diverging nozzle for a two-phase, air- water system. The primary consideration, to determine the effects of accelerating the liquid phase by the gaseous phase, was measured in terms of nozzle exit water velocity, exit slip ratio, and exit acceleration factor. A gamma-ray-attenuation technique was used to determine these values by determining the average cross-sectional void fraction, the ratio of gas volume to total volume, for the air-- water mixture. (B.O.G.)

Kinematic quantities are plotted as a function of particle momentum for the most common elementary particles. Dynamic quantities as a function of incident-particle momentum are plotted for interactions of most of these particles with a proton. Some techniques of relativistic kinematics are also included. (D.C.W.)

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A stage manipulator is described which scans the slide automatically. Means are provided for presetting the horizontal and vertical limits of motion, horizontal rate, and vertical step size, The following components of the manipulator are described: electronic control system, horizontal programmer, and vertical programmer. (D.L.C.)

This review includes a discussion of many methods for detecting ultrasonic images with emphasis upon the problems involved in a nondestructive inspection system employing ultrasonic imaging techniques. The detection methods are compared from the standpoint of threshold sensitivity. It is concluded that a system which will respond to an ultrasonic intensity of 10/sup -3/ w/cm/sup 2/ or less will probably be necessary for a practical nondestructive inspection system. The detection methods which meet this requirement include those classified as optical and mechanical, and as electronic. The annotated bibliography includes 74 entries, many of which contain more than one reference. Included in this bibliography are references to most of the known methods for ultrasonic imaging. (auth)

The dissociation of various mixtures of hydrogen and water vapor and of cupric oxide was calculated over a wide range of temperatures (from 600 to 1700 deg C for the H/sub 2/--H/sub 2/O system, and from 200 to 1000 deg C for CuO). The resulting partial pressures of oxygen are presented in tabular form. (auth)

The performance of electronic circuits and systems in a radiation environment can be determined if the radiation induced component changes are known and if system performance as a function of component changes can be determined. The most economical way of determining alterations of system performance caused by radiation combines analysis with an experimental technique intended for laboratory use. The analytical method requires that the performance of the system be expressed mathematically in terms of component performance. These equations are then solved using component parameters appropriate to discrete radiation levels. This approach also can be used to determine the probability of system failure as a function of radiation exposure. The experimental technique involves measuring system performance after substituting radiation-degraded components into it. Although this latter technique only yields the radiation levels for zero and 100% probability of failure, it is a simple and powerful tool. Exposing a system to radiation in order to determine failure levels or failure probabilities is not practical because the large variations normally encountered in semiconductor device parameters may cause failure to occur over a large range of radiation exposure levels. Therefore, a few observations on a specific system are not a reasonable basis for predicting radiation …

A program is in progress to determine the extent to which Zr-2.5Nb and Zr--2.5Nb-0.5Cu exhibit delayed failure under various conditions of hydrogen content, heat treatment, ambient temperature, and specimen geometry. Specimens are hydrogenated to 200 or 500 ppm in a modified Sieverts apparatus, heat treated or cold reduced (150 deg C), and then evaluated in dynamic tensile and delayed failure tests. Data presented on the ternary alloy show that the beta-quenched and aged condition promotes a high sensitivity to static fatigue fracture. At room temperature, unnotched specimens containing 500 ppm hydrogen showed ordinary dynamic tensile stress-strain properties with very good values of strength and elongation. However, at an applied stress of 95% of the yield stress, static fracture-in the absence of macroscopic plastic deformation---occurred after several hundred hours. Photomicrographs are presented showing the brittle crack propagation through the microstructure; mechanisms for such behavior are still speculative, however. (auth)

A description is given of a high-resolution rocket telemetry system which was developed for transmission to a ground station diagnostic measurements in the radiation environments produced by high-altitude nuclear explosions. Results of mechanical and radiation effects tests are given. (D.L.C.)

A bibliography of approximates 440 references is presented which is arranged into sections dealing with polyacrylates, polyamides, polybutadienes and copolymers, polycarbonates, cellulosics, epoxy resins, polyesters, polyethers, polyethylenes, natural rubber, neoprene, phenolics, polypropylene, rubbers, silicones, polystyrenes, urethanes, polyvinylidenes, polyvinyls, and miscellaneous systems. Reviews, data compilations, books, and references dealing with dynamic mechanical properties are also listed. (D.L.C.)

Two-phase flow parameters for upward cocurrent vertical flow were studied in air--water, nitrogen- Freon-113, and nitrogen-- mercury mixtures. Tests were performed in natural-circulation loops at atmospheric pressure. The superficial liquid velocity ranged from 0 to 1 ft/sec; quality ranges were as follows: for air-water, 0.0125 to 0.100; for nitrogen-- Freon-113, 0.002 to 0.006; for nitrogen-mercury, 0.00005 to 0.0024. The studies of air--water and nitrogen-- Freon-113 mixtures were made in 2.75-in.-ID test section; the nitrogen- - mercury study was made in a 2-in.-ID pipe. The two-phase flow parameters were found to change significantly with superficial liquid velocity and quality in this low-circulation range. Slip ratios were found to be directly proportional to the surface tension of the liquid, and inversely proportional to the dynamic viscosity of the liquid. Dimensional analysis was used to correlate slip ratios and gas-to-liquid holdups as a function of four dimensionless groups which included the liquid circulation rate, the gas circulation rate, the surface tension of the liquid, the dynamic viscosity of the liquid, the density of the liquid, the density of the gas, the pipe diameter, and the acceleration due to gravity. Empirical relations were developed to evaluate slip ratios and void fractions as a function …

The reactions of rocks and soils to large explosions are discussed. Several experimerts planned to measure ground motion produced by chemical and nuclear explosions in sotl and in rock are described. The discussions are confined chiefly to those portions of the force field, which are most likely to be of concern to shelter design and construction. Both underground and low- altitude above-surface explosions were considered. (M.G.C.)