Materials Literature
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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…
The craze-initiation criteria for craze-prone glassy polymers are examined with a model test method. In this method a prismatic sample of polystyrene with an embedded steel ball is subjected to a simple tension until crazing takes place around the interface. Stress analysis showed that various published craze-initiati…
Simple equations are given for determining both refractive index and film thickness from a measurement of interference fringe separation where the question of phase change and the order of the fringes can be disregarded. The equations are quite general, since they apply to fringe maxima or minima for either transmissi…
Hexagonal nickel sulphide shows a transition at 260 K from an antiferromagnetic to a paramagnetic state which is accompanied by an abrupt change in the conductivity. It is suggested that this is not a Néel temperature, that is a destruction of long-range order, but a first-order disappearance of the moments, and that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfirmation of biprotonic phototautomerism in 7-azaindole hydrogen-bonded dimersKenneth C. Ingham, M. Abu-Elgheit, and M. Ashraf El-BayoumiCite this: J. Am. Chem. Soc. 1971, 93, 20, 5023–5025Publication Date (Print):October 1, 1971Publication History Published online1 May 2…
The properties of ferroelectric and ferroelastic crystals are examined in terms of atomic arrangement. Ferroelectric crystals are divided into three classes according to the predominant nature of the atomic displacements required by polarity reversal. The one-dimensional class involves atomic displacements parallel to…
A computer procedure for slit-height correction of X-ray small-angle scattering curves is described, which Ij based on direct calculation of the desmeared intensity values Ij from the equations Ĩi = ∑jai,jIj where Ĩi is the observed smeared intensity at point i and ai,jIj represents the contribution from a point j alo…
Abstract Colicin E1 was purified from mitomycin C-induced Escherichia coli JC411 (ColE1) by salt extraction of extracellular, bound colicin followed by ammonium sulfate fractionation and ion exchange chromatography. The purified preparation was considered homogeneous by several criteria. Gel filtration on Sephadex G-2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and photochemistry of 1,2,3-trisilacycloheptane derivatives. Precursors for tailor-made organosilylenesHideki Sakurai, Yoshiteru Kobayashi, and Yasuhiro NakadairaCite this: J. Am. Chem. Soc. 1971, 93, 20, 5272–5274Publication Date (Print):October 1, 1971Publication…
The history of ferroelectricity is carried to the discovery of the ferrolectric properties of barium titanate in 1943. A few more recent events are noted briefly.