Materials Literature
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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…
Corrosion processes of Al 2 O 3 ‐ZrO 2 ‐SiO 2 and Al 2 O 3 ‐SiO 2 refractories were studied. Chemical, microscopic, and X‐ray diffraction investigations are reported. The results are interpreted using the SiO 2 A1 2 O 3 ‐K 2 O and SiO 2 ‐Al 2 O 3 ‐PbO phase diagrams. An explanation is put forward regarding the process…
A theoretical and experimental description of a new light spectroscopic method for determination of second rank order parameters is presented. The linear dichroism is obtained from the total fluorescent intensity, measured by using an integrating sphere. The method has been tested on a dichroic sample consisting of a…
A synergistic nitrite/N,N-di-(phosphonomethyl) methylamine corrosion inhibitor for ferrous metals in aqueous media has been developed which is an effective corrosion inhibitor when compared to nitrite, zinc chromate, or zinc phosphonate. The protection given to ferrous metals in aerated neutral solutions by this corro…
This paper reports the transient voltage breakdown characteristics of electrical insulation operating at cryogenic temperatures. Nomex®e, Tyvek® and polypropylene film/cellulose paper laminate (PPLP) specimens impregnated with liquid nitrogen (LN2) and containing cavities of known dimensions were subjected to either 1…
In 1926 Semon tried to dehydrohalogenate high molecular weight poly(vinyl chloride) (PVC) in a high boiling solvent to get an unsaturated polymer which might bond rubber to metal. Unexpectedly, he obtained plasticized PVC, a flexible product inert both electrically and chemically. This discovery opened the door to the…
The correlations between results of nondestructive and destructive tests on high-voltage coil insulations for rotating machines were investigated and the following findings were obtained. Breakdown voltage on application of a commercial line voltage (50 Hz) is correlated to the voltage at which a partial discharge bri…
Abstract A technique is described which enables selected areas of a specimen to be located and examined using XPS. Results obtained using the technique are given which indicte that areas less than 0.5 mm square can be analysed.
The magnetostriction constants, λ 100 and λ 111 , of f.c.c. Ni-Co alloys have been measured in the temperature range between 77 and 450 K using the strain gauge technique. The sign of λ 100 changes from negative to positive with increasing Co content in the temperature range between 77 and 450 K, while the values of λ…
The total cross section for pair production by photons in the field of free electrons is fitted to simple analytic expressions in four intervals of the incident photon energy which cover the whole range between threshold and infinity
Abstract Bariumthioantimonate(III), Crystal Structure Ba 8 Sb 6 S17, prepared by fusion of the binary sulfides at 1120 K, crystallizes in the mono-clinic system (space group:P2/c) with a= 1141 ± 1 pm, b = 1373 ± 1 pm, c = 2253 ± 2 pm, β = 90.94 ± 0.05°. In the structure there are isolated distorted SbS 3 3- -trigonal…
Neutron time-of-flight powder data have been collected for forsterite [Mg2SiO4; Pbnm (D162h, No. 62); Z = 4, a = 4.7534 (1), b = 10.1989 (2), c = 5.9813 (1) Å] with the ZING-P′ high-resolution diffractometer at Argonne National Laboratory. Forty-seven variables, including anisotropic temperature-factor coefficients, w…