Radiation from an open-ended waveguide into an inhomogeneously filled space
Numerical solution for radiation from open-ended parallel plate waveguide through dielectric or plasma slab
Kostelnicek, R. J.↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Lunar mascons - A near-surface interpretation.
Lunar mascons, interpreting lunar gravitational field anomalies over maria in terms of near- surface slab-like model for maria structure
Conel, J. E.↗
Calculations of the radiation hazard due to exposure of supersonic aircraft to solar-flare protons.
Supersonic aircraft radiation hazard due to solar flare proton exposure, using Monte Carlo method to estimate dosage as function of tissue slab
Alsmiller, R. G., Jr.↗
Fabrication of electroacoustic RF amplifiers
Anodic bonding of a lithium niobate piezoelectric crystal over a silicon-on-sapphire structure with the crystal mounted over a closely controlled oxide provides a point-contact mount for two rectangular slabs /one piezoelectric and the other a silicon semiconductor/ within 600 A of each other.
Trent, R. L.↗
An experimental and theoretical study of radiative and conductive heat transfer in nongray semitransparent media
Temperature profiles and heat fluxes in slab of molten glass
Eryou, N. D.↗
Reflection coefficients of pyramidal and H- plane horns radiating into dielectric materials
Reflection coefficients of pyramidal and H-plane horns under free-space conditions and with horns radiating onto slabs of plexiglass or quartz
Cockrell, C. R.↗
Estimation of spatial capture distributions in resonance absorbers
Spatial resonance capture rates for U-238 thick slabs to correct gamma ray attenuation errors in broad group shielding calculations
Bogart, D.↗
Method for observing and controlling microcracks in ceramics
Ceramics microcrack propagation control through small slab with simultaneous microscopic observation of path and force changes, considering grain boundaries effects
Leipold, M. H.↗
Calorimetric determination of relative gamma heating in materials of various thicknesses and atomic numbers
Calorimetric determination of reactor gamma source heating as function of specimens thickness and atomic number, discussing slab and cylindrical geometrical effects
Peters, L. E., Jr.↗
Leaching of nitroso rubber material removes uncured polymer
New leaching process removes uncured polymer from nitroso rubber, elastomer used in presence of nitrogen tetroxide. Uncured portion is removed by controlled soaking of polymer slab in Freon TF. Leaching with Freon TF prevents nitroso rubber from adhering to adjoining surfaces and limiting its usefulness in either static or dynamic applications.
Bratfisch, W. A.↗
Experiment Do14: Ultrahigh and very high frequency polarization
The measurement of inhomogeneities in the electron content along the orbital paths of Gemini 8 and Gemini 9 missions was not accomplished because the tracking information was not available. The use of ultrahigh frequency radio transmission was the primary factor in the successful removal of a very high frequency Faraday rotation ambiguity; but, as was expected, this was not very useful for fine-scale polarization studies. Ionosonde data were useful in the computation of the slab thickness at the closest point of approach of the spacecraft.
Ellis, R. E.↗
Calculation of inviscid surface streamlines and heat transfer on shuttle type configurations. Part 2: Description of computer program
A description of the computer program used for heating rate calculation for blunt bodies in hypersonic flow is given. The main program and each subprogram are described by defining the pertinent symbols involved and presenting a detailed flow diagram and complete computer program listing. Input and output parameters are discussed in detail. Listings are given for the computation of heating rates on (1) a blunted 15 deg half-angle cone at 20 deg incidence and Mach 10.6, (2) a blunted 70 deg slab delta wing at 10 deg incidence and Mach 8, and (3) the HL-10 lifting body at 20 deg incidence and Mach 10. In addition, the computer program output for two streamlines on the blunted 15 deg half-angle cone is listed. For Part 1, see N71-36186.
Dejarnette, F. R.↗
Initiation system for low thrust motor igniter
A test program was carried out to demonstrate an igniter motor initiation system utilizing the bimetallic material Pyrofuze for a solid propellant rocket with controlled low rate of thrust buildup. The program consisted of a series of vacuum ignition tests using a slab burning window motor that simulated the principal initial ballistic parameters of the full scale igniter motor. A Pyrofuze/pyrotechnic igniter system was demonstrated that uses a relatively low electrical current level for initiation and that eliminates the necessity of a pyrotechnic squib, with its accompanying accidental firing hazards and the typical basket of pyrotechnic pellets. The Pyrofuze ignition system does require an initial constraining of the igniter motor nozzle flow, and at the low initiating electrical current level the ignition delay time of this system was found to be quite sensitive to factors affecting local heat generation or loss rates.
Strand, L. D.↗
The ORNL-SNAP shielding program
The effort in the ORNL-SNAP shielding program is directed toward the development and verification of computer codes using numerical solutions to the transport equation for the design of optimized radiation shields for SNAP power systems. A brief discussion is given for the major areas of the SNAP shielding program, which are cross-section development, transport code development, and integral experiments. Detailed results are presented for the integral experiments utilizing the TSF-SNAP reactor. Calculated results are compared with experiments for neutron and gamma-ray spectra from the bare reactor and as transmitted through slab shields.
Mynatt, F. R.↗
Galactic cosmic ray heavy primary secondary doses
Results of a calculation which estimates the heavy primary secondary doses from cosmic ray interaction data are reported. The incident galactic cosmic ray heavy primary spectrum is represented as the sum of helium, nitrogen, magnesium, and iron components. The incident iron nuclei are allowed to fragment into lesser Z secondaries, which are assumed to travel in the same direction and start with the same energy per nucleon as the interacting primary. The total emergent particle energy spectra and dose are then presented for the galactic heavy primary spectrum incident on aluminum and tissue slabs. The importance of the fragmentation parameters assumed is also evaluated. The total dose from the heavy primaries and their secondaries is found to be reduced by only a factor of two in 20 g/sq cm of shielding.
Wilkinson, M. C.↗
Electron and bremsstrahlung penetration and dose calculation
Various techniques for the calculation of electron and bremsstrahlung dose deposition are described. Energy deposition, transmission, and reflection coefficients for electrons incident on plane slabs are presented, and methods for their use in electron dose calculations were developed. A method using the straight-ahead approximation was also developed, and the various methods were compared and found to be in good agreement. Both accurate and approximate methods of calculating bremsstrahlung dose were derived and compared. Approximation is found to give a good estimate of dose where the electron spectrum falls off exponentially with energy.
Watts, J. W., Jr.↗
The application of the phase space time evolution method to electron shielding
A computer technique for treating the motion of charged and neutral particles and called the phase space time evolution method was developed. This technique employs the computer's bookkeeping capacity to keep track of the time development of a phase space distribution of particles. This method was applied to a study of the penetration of electrons. A 1 MeV beam of electrons normally incident on a semi-infinite slab of aluminum was used. Results of the calculation were compared with Monte Carlo calculations and experimental results. Time-dependent PSTE electron penetration results for the same problem are presented.
Cordaro, M. C.↗
The estimation of galactic cosmic ray penetration and dose rates
This study is concerned with approximation methods that can be readily applied to estimate the absorbed dose rate from cosmic rays in rads - tissue or rems inside simple geometries of aluminum. The present work is limited to finding the dose rate at the center of spherical shells or behind plane slabs. The dose rate is calculated at tissue-point detectors or for thin layers of tissue. This study considers cosmic-rays dose rates for both free-space and earth-orbiting missions.
Burrell, M. O.↗