Materials Literature
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The problem of step motion during lateral growth in solid-solid phase transformations is considered. The present model is concerned with the case in which volume diffusion in the parent phase is the predominant contribution to the growth rate, and it is assumed that the steps do not interact appreciably. The relations…
The interaction of oxygen with a polycrystalline W filament has been studied in the temperature range 300–1200°K and for exposures between 10−7 and 1 torr·sec. Both sticking probabilities and desorption spectra have been measured. After low exposures (〈2×10−6 torr·sec) the adsorbate is all desorbed as O atoms with fir…
Membrane-enclosed fecal pellets of planktonic herbivores were sampled at several depths in the Baltic Sea (459 meters deep) and off Portugal (4000 meters deep) by means of a Simonsen multinet. Pellets contained mainly empty shells of planktonic diatoms and silicoflagellates. Two kinds of fecal pellets were found, thos…
Abstract The presence of small amounts of divinylacetylene in the monomer during the emulsion polymerization of chloroprene results in substantial increase of the molecular weight, gel formation, and in corresponding changes of physical and mechanical properties of vulcanizates. These changes appear at concentrations…
Abstract The influence of small amounts of 1‐chloro‐1,3‐butadiene on the kinetics of the emulsion polymerization of 2‐chloro‐1,3‐butadiene and on properties of the resulting polychloroprene has been studied. Some changes in the properties of the chloroprene polymers were observed at 1‐chloro‐1,3‐butadiene concentratio…
Magnetostriction constants of MnxFe3−xO4 at room temperature are reported and related to the cation distribution in these spinels. Octahedral Fe2+ ions give a positive contribution to λ111. The contribution to λ100 of octahedral Mn3+ ions is negative in this system and is not a linear function of the Mn3+ concentratio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen peroxide formation upon oxidation of oxalic acid in presence and absence of oxygen and of manganese(II). I. Manganese(VII), cerium(IV), chromium(VI), and cobalt(III) as oxidantsI. M. Kolthoff, E. J. Meehan, and Masaru KimuraCite this: J. Phys. Chem. 1971, 75, 21, 33…
Abstract This study was an investigation of the effects of sesquioxide constituents on some mineralogical and physiochemical properties of a Panamanian latosol. Latosols are soils characterized by high concentrations of iron and aluminum oxides and a general absence of free silica and alkaline earths. X-ray diffractio…
Abstract The contribution to the residual electrical resistivity of high angle grain boundaries due to the scattering of conduction electrons by voids into the boundaries is calculated for Au, Cu, and Al. Two types of geometries are considered: array of cylindrical voids for symmetrical tilt boundaries and point voids…
Floquet's theorem, and the general qualitative features of the band structure, are described in the one-dimensional case. The discussion includes a little-known unstable state at band edges that is not a Floquet function. This “band edge state” can in certain cases play a role in a thin crystalline layer, analogous to…
Human coronavirus (HCoV) infection causes respiratory diseases with mild to severe outcomes. In the last 15 years, we have witnessed the emergence of two zoonotic, highly pathogenic HCoVs: severe acute respiratory syndrome coronavirus (SARS-CoV) and ...Read More
An 18Ni (280) maraging steel has been tested in 3.5% NaCl solution under various modes of loading. The most severe condition was plane strain loading of fatigue precracked samples. The severity of stress corrosion cracking (SCC) of unnotched samples decreased in the sequence: plane strain bending, tension, plane stres…
The profiles of screw dislocations and stacking faults in thin crystals, when imaged in the back-scattered mode of the scanning electron microscope, have been calculated using dynamical diffraction theory. These results may be extended to thick crystals by the inclusion of a suitable background term to allow for multi…
A novel electro-optical storage effect has been found in a certain smectic liquid crystal. The optical transmission of a smectic liquid film changes with the application of a dc or an ac exciting voltage and remains in the excited state after the field is removed. Some different effects are observed in a thin (12-μ) a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical synthesis of 1,2-diazepines. V. Synthesis and rearrangements of 1,2-diazepinesJacques Streith, Jean P. Luttringer, and Michel NastasiCite this: J. Org. Chem. 1971, 36, 20, 2962–2967Publication Date (Print):October 1, 1971Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of barium and strontium sulfates in strong electrolyte solutionsA. Gene Collins and James W. DavisCite this: Environ. Sci. Technol. 1971, 5, 10, 1039–1043Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 Octo…
The quadrupole and magnetic interactions in compounds of the type ${(R\mathrm{N}{\mathrm{H}}_{3})}_{2}\mathrm{Fe}{\mathrm{Cl}}_{4}$, where $R=\mathrm{C}{\mathrm{H}}_{3},{\mathrm{C}}_{2}{\mathrm{H}}_{5},{\mathrm{C}}_{3}{\mathrm{H}}_{7}$, and ${\mathrm{C}}_{6}$${\mathrm{H}}_{5}$C${\mathrm{H}}_{2}$ have been studied. The…
Abstract The polymerization of β‐butyrolactone was investigated as a possible monomer for a proposed synthesis of the naturally occurring polyester, D ‐poly‐β‐hydroxybutyrate ( D ‐PHB). The racemic DL ‐monomer was used in this initial study to determine the best conditions and catalyst system for use in a subsequent s…
An electron microscope study has been made of the time-dependent annealing behaviour of interstitial loops in impure and pure molybdenum neutron-irradiated at 77°K (A77 and C77) respectively and of vacancy loops in pure molybdenum neutron-irradiated at 473°K (C473). The results have been quantitatively analysed and lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhodium(I) and iridium(I) complexes with 1,1,1-tris(diphenylphosphinomethyl)ethaneW. O. Siegl, S. J. Lapporte, and J. P. CollmanCite this: Inorg. Chem. 1971, 10, 10, 2158–2165Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inis…