Materials Literature
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Abstract In Mg‐ and Ca‐doped α‐Al 2 O 3 crystals irradiated by X‐rays at 80 K new paramagnetic colour centres are observed having an absorption band at about 255 nm and an emission band at 310 nm. The hyperfine structure of the EPR spectrum indicates that the unpaired electron spin interacts mainly with two Al 27 nucl…
The annealing of the electrical resistivity of two high-purity austenitic Fe-Cr-Ni alloys, and of Si- and Ti-doped samples has been investigated after neutron irradiation at 23K. The resistivity variations (a decrease below 190K, an increase between 190 and 600K, and a decrease above 600K) can be understood in terms o…
Secondary Langmuir-wave decay into another Langmuir wave and an ion-acoustic wave is shown to provide a very efficient saturation mechanism for two-plasmon decay and stimulated Raman scattering. Near the quarter critical density, where two-plasmon decay dominates Raman scattering, large ion fluctuations are expected a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of axial anionic ligand and porphyrin substituent effects on the oxidation of iron(III) porphyrins: porphyrin-centered vs. metal-centered oxidationMartin A. Phillippi, Eric T. Shimomura, and Harold M. GoffCite this: Inorg. Chem. 1981, 20, 4, 1322–1325Publicatio…
The polarization reversal of some tetragonal-phase PLZT ceramics is studied. The results are explained in terms of 90° domain wall motions. A reported theory originally derived for rhombohedral-phase PLZT 6/65/35 ceramics is shown to be applicable to tetragonal-phase PLZT ceramics also by introducing the remanent degr…
Abstract K-bentonites of the Middle Ordovician High Bridge Group along the Cincinnati arch are characterized by interstratified illite/smectite (I/S) clays with rectorite-type ordering. Approximately 20% of the layers are expandable. They are structurally similar to I/S formed at temperatures exceeding 100°C during bu…
Tb3+ and Eu3+ bound to troponin C were detected by (1) changes in the fluorescence of the tyrosine chromophore of the protein or (2) the luminescence of the ions themselves excited by energy transfer from the protein or by direct excitation using a pulsed laser light source [Horrocks, W. DeW., Jr., & Sudnick, D. R. (1…
Nonevaporable getters have been widely used for many years in sealed vacuum or controlled atmosphere devices. They are also finding applications in other fields, where specific characteristics are required and tailor-made getters are requested, in some cases sacrificing speed in favor of lower activation temperatures,…
A computer simulation has been carried out for the core structure of a 1/3⟨1123⟩ {1122) edge dislocation using the truncated Lennard-Jones (12–6) potential. The core is composed of two distinct structural units which can be interpreted in terms of {1121) and {1122) twins. This core structure differs markedly from that…
The temperature factor (B = 0.70 Å2) and atomic parameter (x = 0.305) were determined by comparing the observed and calculated powder diffraction data for synthetic β-PbO2. This material is tetragonal with a = 4.961 (2), c = 3.385 (2) Å, and space group P4/mnm.
The effect of oxygen adatom coverage and order upon the formation of CO3 intermediates via CO2+O(a)→CO3(a) was examined on the Ag(110) surface. The reaction probability for CO2 was found to be strongly dependent upon the oxygen adlayer. Adsorption of CO2 upon an ordered oxygen adlayer at 300 K occurred with a net reac…
The orientation of some fluid (DF) and optically uniaxial columnar (D) discophases by surfaces is examined by optical microscopy. The test materials are 2,3,6,7,10,11 hexa-substituted triphenylenes, including two new compounds exhibiting mesophases at room temperature, and a binary mixture with a DF, phase stable betw…
We have measured the twist viscosity Y′(T) by the rotating field method, over the entire nematic range of the 4,4′-di-n-alkoxyazoxybenznes (mOAB) from m = 2 to m = 7. The results of these measurements are presented here together with a new development of our previous theory of γ1(T) which accounts for the free volume…
The c/a ratio, vacancy-formation energy, elastic constants and phonon frequencies for metals having the h.c.p. structure are assessed and it is found that, although empirical potentials for individual metals have not as yet been developed, data for most metals are fitted reasonably well by a truncated Lennard—Jones po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungsten-183 NMR and x-ray study of a heteropolyanion [As2W21O69(H2O)]6- exhibiting a rare square-pyramidal environment for some tungsten(VI)Y. Jeannin and J. Martin-FrereCite this: J. Am. Chem. Soc. 1981, 103, 7, 1664–1667Publication Date (Print):April 1, 1981Publication Hi…
The purified folate-binding proteins of rat liver mitochondria have been identified as two separate enzymes: dimethylglycine dehydrogenase (EC 1.5.99.2) and sarcosine dehydrogenase (E.C. 1.5.99.1) (Wittwer,
SUMMARY. A standard method is given for describing plant communities in fast‐flowing streams and rivers. This involves the selection of a representative 10‐m length of stream (termed a reach) which can be re‐located exactly. Various estimates of the relative areas covered by different physiognomic forms and the relati…
Collagen is the major matrix protein produced by corneal endothelial cell cultures and represented 1% of total protein synthesis. The different types of collagen were determined by a combination of DEAE- and CM-cellulose column chromatography using known internal markers. Type III collagen was the major component both…
Correlated calculations using many-body perturbation theory and good basis sets for the dipole moment, polarizability, and hyperpolarizabilities of ${\mathrm{H}}_{2}$O are reported. The finite-field coupled Hartree-Fock (CHF) theory is used as a zeroth-order approximation, with electron correlation included via the li…
High resolution electron lattice images of an end-on, dissociated 60° dislocation in silicon have been used to determine the type (shuffle or glide) of dislocation present. Characteristic features of the 30° partial core image which depend on detail beyond the instrumental point resolution have been used together with…