Materials Literature
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This paper describes the results of low-energy electron transmission and secondary-electron emission experiments on thin films of long-chain alkanes deposited on metal substrates. The spectral changes due to crystal-melt phase transition were measured in situ in both experiments. The ground-state energy ${V}_{0}$ of t…
The ability of a group of water-soluble metalloporphyrins to cleave DNA has been investigated. Incubation of Mn3+, Fe3+, or Co3+ complexes of meso-tetrakis(N-methyl-4-pyridiniumyl)porphine (H2T4MPyP) with DNA in the presence of ascorbate, superoxide ion, or iodosobenzene results in DNA breakage. Comparisons between th…
Abstract Two conventions have been used to represent smectite formulas in mineral hydrolysis reactions: exchangeable cations are either included in (monophase structure) or excluded from (charged structure) the Standard State phase designation. Replicate mixtures of K‐saturated Belle Fourche montmorillonite, kaolinite…
Auxospore formation and vegetative cell division are described for Mastogloia smithii. This species is unique among raphid diatoms for its cis-type behavioural anisogamy. This results in both auxospores being formed within one gametangial frustule. Auxospore formation in M. smithii has its closest parallels with certa…
It is shown that the quantity of water mixing into the air-flow is an insignificant proportion of the total amount of water used in the air-jet texturing process and that this has a negligible effect on the air-flow in the texturing nozzle. It is suggested that only a fraction of this water is needed to impart the des…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and electrochemical properties of iridium-carbon bonded metalloporphyrins. Characterization of (OEP)Ir(C8H13) and (OEP)Ir(C8H13)(CO)J. L. Cornillon, J. E. Anderson, C. Swistak, and K. M. KadishCite this: J. Am. Chem. Soc. 1986, 108, 24, 7633–7640Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo New Tetranortriterpenoids from Azadirachta indicaSalimuzzaman Siddiqui, Tariq Mahmood, Bina Shaheen Siddiqui, and Shaheen FaiziCite this: J. Nat. Prod. 1986, 49, 6, 1068–1073Publication Date (Print):November 1, 1986Publication History Published online1 July 2004Published…
The safeguard aspects of Cm-244 - a nuclear waste product in LWRs - in a cylindrical hybrid blanket, driven by a (D,T) fusion neutron source have been analyzed.Cm-244 has been investigated for two different applications:1) As a neutron multiplier between the first wall and the fuel zone in a blanket with ThO22) As a c…
The properties of the supply yarn and the processing parameters together determine the final properties of air-jet-textured yarns. An investigation is reported on how variations in overfeed, air-pressure, and texturing speed, wet or dry processing, and the use of an impact element each affect the properties of the yar…
The effect of nozzle design on the air velocity for an air-jet filling insertion system has been investigated. The relationship between the supply air pressure and the air velocity at the nozzle axis is explained using a simplified model for the nozzle. The presence of the yarn tube has a substantial influence on nozz…
The resistivity of tungsten films prepared by magnetron sputtering, electron gun evaporation, and chemical vapor deposition was measured in the 4.2–297 K temperature range. The resistivity ρ in all films decreases linearly with temperature down to 60 K, indicating that scattering by lattice phonons is responsible for…
High-resolution quartz microbalance measurements of Ne films on Ag show a continuous transition from incomplete to complete wetting. The wetting temperature is identical to the triple point ${T}_{t}$ to within a few millikelvins. The frequency shift \ensuremath{\Delta}${f}_{0}$ corresponding to the maximum thickness a…
Frequency dispersion of the impedance of the p‐type porous Si layer (PSL)/aqueous electrolyte interface has been investigated to characterize its electrical properties. The PSL electrodes are formed on (100) p‐Si substrates (3.5–4.5 Ωcm in resistivity) by anodic treatment in solution. Impedance measurements over a wid…
Sixty biostratigraphically useful diatom taxa are tabulated from three stratigraphic sections of the upper Oligocene to lowermost Miocene of the San Gregorio Formation of Baja California, Mexico. The diatom flora is a mixture of low- and high-latitude species and allows correlation of key sequences at San Gregorio, La…
Abstract Thermoplastics are currently receiving considerable attention for potential use as structural resins in aerospace vehicles. These materials offer an attractive combination of chemical, physical and mechanical properties. Perhaps the most important advantage offered by the thermoplastics over the new toughened…
The 1050 °C oxidation behavior of an iron–25 wt. % chromium–4 wt. % aluminum alloy modified by yttrium additions was studied. Yttrium was added to this alloy in the form of (1) a metallic addition; (2) an ion implant; and (3) as yttrium sulfide. In agreement with other investigators, metallic yttrium additions effecte…
This investigation of composite material properties utilized T300/934 graphite-epoxy that was subjected to 1.0 MeV electron radiation for a total dose of 1.0 x 10 10 rads at a rate of 5.0 x 10 7 rads/hour, simulating a worst-case exposure equivalent to 30 years in space. Mechanical testing was performed on 4-ply unidi…
Charpy impact specimens, one third the size of standard specimens in all dimensions have been tested for a variety of steels and the data have been compared to standard specimen data. The absorbed energy curves are qualitatively similar for both specimen types, and quantitative evaluations of dynamic yield strength an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and transport properties of tantalum nickel selenide (Ta2NiSe7) and tantalum platinum selenide (Ta2PtSe7)Steven A. Sunshine and James A. IbersCite this: Inorg. Chem. 1986, 25, 24, 4355–4358Publication Date (Print):November 1, 1986Publication History Pub…
Auxospore formation in Nitzschia recta and N. sigmoidea is associated with allogamous sexual reproduction, in which two vegetative cells pair and function as gametangia. Each gametangium produces two morphologically identical gametes, one of which is active and the other passive (trans-behavioural anisogamy). The game…