Development of a Co-W ferromagnetic high- temperature structural alloy.
Co-W ferromagnetic alloy combining high temperature strength and magnetic properties for space power generator rotors
Ashbrook, R. L.↗
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Development of a Co-W ferromagnetic, high- temperature structural alloy.
Co-W alloy for rotor material in space power conversion system improves high temperature stress-rupture and magnetic properties
Ashbrook, R. L.↗
Influence of high-temperature heat treatment on surface order and faceting of some Mo, W, Ta and Re crystal surfaces
High temperature heat treatment effects on Mo, W, Ta and Re crystal surface order and faceting observed by electron diffraction, noting contamination role
Barton, G.↗
Quasiequilibrium treatment of gas-solid reactions. I - Evaporation rates of volatile species formed in the reaction of O2 with W, Mo, and C
Quasi-equilibrium treatment of heterogeneous reactions applied to evaporation rate /desorption/ computation for volatile species formed in oxygen reactions with W, Mo and graphite
Batty, J. C.↗
An examination of simple coordinate transformations in the Z-plane and W-plane for root locus analysis of sampled-data systems
Examination of simple coordinate transformations in Z-plane and W-plane for root locus analysis of sampled data systems
Kozoil, J. S., Jr.↗
An integral test of inelastic scattering cross sections using measured neutron spectra from thick shells of Ta, W, Mo, and Be
Integral test of inelastic scattering cross sections using measured neutron spectra from thick shells of Ta, W, Mo, and Be
Alexander, R. L.↗
Oxygen adsorption, reconstruction, and thin oxide film formation on clean metal surfaces - Ni, Fe, W and Mo
Ultrahigh vacuum deposited Ni, Fe, W and Mo films, determining molecular oxygen adsorption efficiencies
Horgan, A. M.↗
An integral test of inelastic scattering cross sections using measured neutron spectra from thick shells of Ta, W, Mo, and Be
Inelastic scattering cross sections, using measured neutron leakage spectra from thick spherical shells of Ta, W, Mo and Be
Alexander, R. L.↗
Development of a 20-W solid-state S-band power amplifier
As an alternative to the use of traveling wave tube amplifiers in spacecraft with long life mission requirements, a solid state S band amplifier was developed. A solid state amplifier with an output of 20 W at 2295 MHz, a dc/RF efficiency of 38%, and a gain of 27 dB was developed. The physical and electrical performance of the solid state amplifier are described.
Vandercapellen, A. G.↗
Proton and deuteron double differential cross sections at angles from 10 deg to 60 deg from Be, C, Al, Fe, Cu, Ge, W, and Pb under 558-MeV-proton irradiation
The double differential cross sections for the production of protons and deuterons from targets of Be, C, Al, Fe, Cu, Ge, W, and Pb were obtained at laboratory angles of scatter of 10, 20, 30, 40, 50, and 60 degrees for 558-MeV incident protons. The position of the quasi-elastic peak, discernible in the cross sections up to approximately 40 degrees, corresponded closely to the theoretical predictions for proton-proton elastic scattering at 558 MeV. The mean ratio of deuteron to proton energy-integrated cross sections was 0.056 + or - 0.008. The dependence of energy-integrated cross sections for both protons and deuterons on target mass number A varied from A to the 1/3 power at 10 degrees to A to the 2/3 power above approximately 30 degrees. The ratio of energy-integrated deuteron cross sections for quasielastic processes to that for reactions yielding a deuteron-pi-meson pair was approximately 10 percent.
Beck, S. M.↗
Superalloy eutectic composites with the VI A refractory elements - Cr, Mo and W
The paper discusses the phase equilibria for the ternary systems NiAlCr, NiAlMo, and NiAlW, with emphasis on reactions from the liquid state, although some of the solid state reactions are mentioned. It is shown that eutectics in the Ni-Al-refractory element (Cr, Mo, W) systems offer the potential for high-temperature turbine blade and vane applications. In particular, it is shown that the phase diagrams of these ternary systems can be manipulated to alter the eutectic phases and morphologies by simple quaternary alloying modifications. The resultant combination of chemistry and structure can be controlled to ensure a behavior that is well-matched to hot section component materials requirements.
Jackson, M. R.↗
The adsorption and early stages of condensation of Ag and Au on W single-crystal surfaces
Silver and gold were evaporated up to several monolayers in thickness onto W single-crystal surfaces of the 110 and 100 plane types in the temperature range between 300 and 1300 K. The mode of growth and the structure of the layers were studied by Auger electron spectroscopy and low-energy electron diffraction. The results are compared with thermal desorption spectroscopy data and work-function change measurements. They show certain similarities but also some striking differences between the two systems Ag/W and Au/W as well as a strong crystallographic anisotropy of adsorption and condensation.
Bauer, E.↗
Winds from the Atlanta /34 deg N, 84 deg W/ radio meteor wind facility
A brief description of the Georgia Tech radio meteor wind facility is followed by a tabular presentation and discussion of winds measured over Atlanta (34 deg N, 84 deg W) for the first three intervals of the URSI/IAGA Cooperative Tidal Observations Program (CTOP). The pervailing zonal wind measured during August 1974, being easterly, is significantly different from that measured during October 1975 and January 1976, and is not typical of winds measured in August 1975 and August 1976, when westerlies predominated. The complicated tidal picture is detailed, but is not easily summarized.
Roper, R. G.↗
Notes on the early-type components of W Cep, o Cet, CH Cyg, AR Mon, and BL Tel
Low resolution IUE spectra in both spectral regions are used to clarify the nature of the warmer components of several binary systems. The W Cep, the primary of which is a luminous K-type supergiant, shows an ultraviolet absorption spectrum of type B0 or B1; this system is heavily reddened. The hot companion of Mira (o Cet) is surprisingly faint in the short wavelength region, but it excites a rich emission spectrum from the surrounding gas. The ultraviolet active M7 giant CH Cyg is shown to be a binary with a hot companion. This system was also observed at high resolution and shows variable Fe II emission and well-separated circumstellar and interstellar absorptions within the broad Mg II emission profiles. The eclipsing binaries AR Mon and BL Tel are shown not to have hot companions.
Wing, R. F.↗
Development of W-Ta generator
This research program was used to further develop the existing W-Ta generator and to evaluate alternative adsorbents, preferably inorganic materials, as supports for the generator. During the first half year, combinations of non-complexing eluents and a variety of adsorbents, both inorganic and organic, were evaluated. Some of these adsorbents were synthetic, such as chelate resins that could be specific for tungsten. In the second half of the year, the stress was mainly on the use of complexing eluents because of the high affinity of hydrous oxides for tantalum, on the synthesis of chelate resins and on the use novel techniques (electrolytic) to solve the tantalum-adsorption problem.
Source record↗
Chromospheric emission of W Ursae Majoris-type stars and its relation to the structure of their common envelopes
Short-wavelength IUE spectra of 14 W UMa binary systems were analyzed. All but the A2 V system GK Cep and possibly the A8 system AG Vir show chromospheric and transition-region emission lines. This property extends to at least as early as A8-9. The luminosity in transition-region emission lines is roughly proportional to bolometric luminosity. The strength of transition-region emission relative to chromospheric emission is roughly independent of spectral type and is at least as great as for other stars with enhanced surface activity. The enhanced chromospheric activity and light curve peculiarities of the hotter systems seem to disagree with the predictions of the contract-discontinuity models for contract binary structure.
Eaton, J. A.↗
Experimental studies of the separated flow over a NASA GA(W)-1 airfoil
The separated flow over the 17-percent-thick blunt-trailing-edge NASA GA(W)-1 airfoil is investigated experimentally at angles of attack 10.3-18.4 deg and velocities up to 92 m/sec in the 1.09 x 0.76 x 1.22-m working section of a closed-circuit wind tunnel, with typical Reynolds numbers of the order 4 x 10 to the 6th. The results are presented graphically and characterized. Separated-flow velocity profiles and skin-friction distributions are obtained, and the boundary-layer integral properties are shown to be in good agreement with the separation criteria of Sandborn and Kline (1961). The chordwise development of the mean velocity is reduced to a universal curve, and some similarity is found in the outer-region velocity profiles downstream of the separation.
Mehta, J. M.↗
0.5 W 2-21 GHz monolithic GaAs distributed amplifier
A novel circuit concept to reduce the gate loss using series capacitors on the gate feeding lines has been implemented for a distributed amplifier design. It has significantly increased the gate width of the amplifier with a resultant increase of the broadband output power and efficiency. A monolithic GaAs distributed amplifier using 6 x 300-micron FETs has achieved a record output power of 0.5 W over the 2 to 21 GHz frequency band with at least 4 dB gain. The power-added efficiency was 14 percent. The linear gain was 5 plus or minus 1 dB over the same frequency band.
Kim, B.↗