Mean lives of excited levels in fluorine
Fluorine ions excited levels mean lives from beam- foil line spectrum analysis
Berry, H. G.↗
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Transitions and level lifetimes in Ne II, III, Ar II, III, Kr II, III and Xe II
Ne, Ar, Kr and Xe ionized states transition and level lifetimes from photographically recorded beam foil spectra, discussing particle energies
Bashkin, S.↗
Stark-induced quantum beats in H Ly alpha emission
Stark induced quantum beats in H Ly alpha emission, using beam foil excited hydrogen
Andrae, H. J.↗
Lifetime measurements and absolute oscillator strengths for some vacuum-ultraviolet transitions in O I and O II
O I and II resonance transitions radiative lifetimes in vacuum UV, using beam foil method
Berry, H. G.↗
Energetic ions produced by laser pulse
Laser pulse produced energetic ion and plasma measurements fore and aft side of targets including Al and Au foils
Linlor, W. I.↗
Design considerations for Gardon heat flux sensors
Centerline loss, transient sink temperature and thermal conductivity design constantan considerations for thin foil copper-Gardon heat flux sensors
Ash, R. L.↗
Reduction of Doppler broadening of spectral lines in fast-beam spectroscopy
Spectral lines Doppler broadening reduction in spectroscopy using foil and gas excited accelerator beams as light sources
Leavitt, J. A.↗
Mean lives of excited levels in O I-O VI
Ion beam-foil produced oxygen spectra in wavelength range between 450 and 2200 A, determining mean radiative lives of O I - O VI excitation levels
Berry, H. G.↗
Charge identification for spectral lines in nitrogen
Spectral line emission from nitrogen ions, identifying charge by Doppler shift technique application to beam foil light source
Bashkin, S.↗
Measurement of g-factors for levels in Ne II, III
Lande g factors measurement of excited electronic states in Ne 20 II and III, using alignment of radiating particles in beam foil light source
Church, D. A.↗
An improved ion thinning apparatus
Ion bombardment thinning apparatus for preparing electron microscope foils of inorganic nonmetallic samples including ceramics, minerals and rocks
Christie, J. M.↗
Flexible thermal device
Fabrication of expansion joint, vibration isolator device with sufficient cross sectional area for high thermal conductivity is discussed. Device consists of multiple layers of metal foil which may be designed to meet specific applications. Thermodynamic properties of the device and illustration of construction are provided.
Wallace, S. D.↗
Development of a highly reliable composite board for printed circuitry for use in space environment
Materials, processes and fabrication techniques have been investigated for the development of a high-temperature circuit-board laminate. High quality, void-free copper-clad laminates have been made using 7628/HS-1 style fiberglas reinforcements with filled polyimide matrices. The fabricating characteristics of P13N resin appear suitable for use as a filled matrix in this circuit board development. High-fired, ball-milled alumina appears to be necessary to obtain the desired effects in the circuit board system. Nickel-clad copper foil bonding surfaces appear to be another requirement for retention of good bond strengths after art work and plating sequences. The fabrication cycle for this circuit board system is very dependent on the heating profile. Very rapid heating with quick loading is recommended. A stack approach to lamination was successfully used.
Bradbury, E. J.↗
The measurement of radiation exposure of astronauts by radiochemical techniques
The concentrations of 23 major, minor, and trace elements in the fecal samples from the Apollo 12 and 13 astronauts are reported. Most elemental excretion rates are comparable to rates reported for earlier missions. Exceptions are noted for calcium, iron, and tin. Body calcium and iron losses appear to be reduced during the Apollo 12 and 13 missions such that losses now seem to be insignificant. Refined measurements of tin excretion rates agree with normal dietary intakes. Earlier reported tin values are in error. A new passive dosimetry canister was designed which contains foils of tantalum, copper, titanium, iron, cobalt, aluminum, and scandium. By measuring the concentrations of the various products of nuclear reactions in these metals after space exposure, the characteristics of the incident cosmic particles can be determined.
Brodzinski, R. L.↗
Study of structural behavior of thin films
The work directed towards developing methods of increasing the strength of thin boron films is reported. The program was divided into two main parts. The first involved the improvement of methods for the measurement of the strength of thin films. The second was a study of the effect of condensation of deposition temperature on the strength of the films. Techniques were developed for depositing boron films onto both sides of thin titanium and tantalum foils. Small dogbone sections of boron were made by masking. Strain gauges were then mounted on these to measure failure strains when the films were loaded in tension. Test results were consistent with those obtained by flexure tests. The most important flaws in the boron films appeared to have been generated by either small globules of boron ejected from the melt or small particles (possibly boron dust) on the substrate prior to deposition.
Feakes, F.↗
Development of dispersion-strengthened Ni-Cr-ThOz alloys for the space shuttle thermal protection system
Manufacturing processes were developed for TD-NiCr providing small sheet (45 x 90 cm), and larger sheet (60 x 150 cm) and foil. The alternate alloy, DS-NiCr, was produced by pack-chromizing Ni-ThO2 sheet. Formability criteria are being established for basic sheet forming processes, which are brake forming, corrugation forming, joggling, dimpling, and beading. Resistance spot welding (fusion and solid state), resistance seam welding, solid state diffusion welding, and brazing are included in the joining programs. Major emphasis is centered on an Al-modified Ni-Cr-ThO2 alloy development. These alloys, containing 3 to 5% Al, form the protective Al2O3 scale. This enhances oxidation resistance under reentry conditions. Both TD-NiCrAl and DS-NiCrAl alloys are included. A tentative composition of Ni-16Cr-3.5Al-2ThO2 was selected based on oxidation resistance and fabricability.
Blankenship, C. P.↗
Cyclic furnace oxidation of clad WI-52 systems at 1040 C and 1090 C
Cyclic furnace oxidation studies were conducted on the cobalt alloy WI-52 clad with Ni-30Cr, Fe-25Cr-4A1, and Ni-20Cr-4A1 foils (0.051 to 0.254 mm thick). Tests as long as 400 hours using 1- and 20-hour cycles showed that the Ni-Cr- and Fe-Cr-A1 claddings were about equally protective at both temperatures. The protective ability of these alloys was influenced by exposure temperature and cladding thickness. At both temperatures, they protected WI-52 about as well as, or better than, a widely used commercial aluminide coating. The Ni-Cr-Al claddings did not protect WI-52 nearly as well. Interdiffusion generally influenced the oxidation behavior of all clad WI-52 systems.
Gedwill, M. A.↗
Titanium reinforced boron-polyimide composite
Processing techniques for boron polyimide prepreg were developed whereby composites could be molded under vacuum bag pressure only. A post-cure cycle was developed which resulted in no loss in room temperature mechanical properties of the composite at any time during up to 16 hours at 650 F. A design utilizing laminated titanium foil was developed to achieve a smooth transition of load from the titanium attachment points into the boron-reinforced body of the structure. The box beam test article was subjected to combined bending and torsional loads while exposed to 650 F. Loads were applied incrementally until failure occurred at 83% design limit load.
Clark, G. A.↗