Materials Literature
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Phenomenological theory of phase separation of a binary alloy at low temperatures is developed. The equation of motion for a structure function is derived. The damping coefficient is chosen to give a correct shape of the structure function at large wave numbers. On a scaling assumption we have a slow asymptotic decay…
A comparison of intravenous to intracarotid artery (ICA) administration of 14C-BCNU (1,3-bis(2-chloroethyl)-1-nitrosourea) was made in squirrel monkeys. Radioactivity was measured as soluble drug products and as RNA-, DNA-, and protein-bound radioactivity. The ICA administration of BCNU achieved 190% to 280% higher br…
Recommended levels of a number of metals for Great Lakes Water Quality Objectives were found to be very toxic to freshwater algae when these metals were present simultaneously in lake water and culture medium. The diatom tested was more sensitive to metal toxicity than the blue-green and green algae. Key words: metals…
Alternating current microcalorimetry was used to measure the specific heat of 4-$n$-pentylphenylthiol-4\ensuremath{'}-$n$-octyloxybenzoate in the nematic, smectic-$A$, and smectic-$C$ phases. Critical exponents were found to be consistent with the superfluid analogy of de Gennes for the nematic to smectic-$A$ transiti…
A frequency domain technique is demonstrated which permits the determination of the homogeneous linewidth and relaxation rates of inhomogeneously broadened transitions in crystals, liquids, and glasses. The density-matrix formalism is employed to explain the origins of the intensity-dependent dichroism and birefringen…
An ordered ilmenite phase of the compound MnSnO3 is evidenced from powder patterns. The hexagonal and rhombohedral unit-cell parameters are respectively: a = 5.358 (1), c = 14.505 (4) Å, Z = 6 and a = 5.740 (1) Å, α = 55.65 (2)°, Z = 2: Dm = 6.11, Dx = 6.12 g cm−3.
John D. Koppen, Distribution and Aspects of the Ecology of the Genus Tabellaria Ehr. (Bacillariophyceae) in the Northcentral United States, The American Midland Naturalist, Vol. 99, No. 2 (Apr., 1978), pp. 383-397
Mechanical injury or infection with Helminthosporium maydis race T or O enhanced peroxidase activity in leaves of two corn inbreds which differ in their susceptibility to the fungal race T. Increases in activity were found in the soluble fraction extracted from tissues with 20 mm phosphate buffer (pH 6), and in the io…
Abstract Neo acids are highly branched synthetic trialkyl acetic acids manufactured by reacting an olefin with high purity carbon monoxide under high pressure in the presence of an acidic‐type catalyst. The starting olefins for neopentanoic (C 5 , single isomer) and neodecanoic (C 10 , mixed isomers) acids are isobuty…
Practical procedure for evaluation of strength of coated fabrics with crack requires a formula which bears on expression of an inherent property of the materials in phenomenon of the crack extension.
A series of polyurethane elastomers based on an aliphatic diisocyanate and a polyether macroglycol was polymerized with various cross-link densities and OH/NCO ratios. Stoichiometries yielding between 8,600 and 12,900 gm/mole/crosslink and an OH/NCO ratio of 1.1 resulted in polymers with the low modulus, yet high stre…
Coefficients of linear thermal expansion are reported in the range from room temperature to 250 degrees C for six optical materials: Polytran potassium chloride and Polytran calcium fluoride-Harshaw; chemical-vapordeposited (CVD) zinc selenide and zinc sulfide-Raytheon; single-crystal germanium-Eagle-Picher; and lithi…
The general class of phase equivalent nonlocal potentials is examined using standard reaction matrix methods. The relationship between phase equivalent overlap matrices is derived and it is found that the matrices fall into four general classes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of .mu.-oxo-bridged iron(III) complexes with organic acids: a characterization of the productsRonald G. Wollmann and David N. HendricksonCite this: Inorg. Chem. 1978, 17, 4, 926–930Publication Date (Print):April 1, 1978Publication History Published online1 May 2002P…
Abstract Small‐angle x‐ray scattering (SAXS) has been used to study the formation of microvoids in polymers which craze or stress‐whiten extensively. Specimens are subjected to a stepwise uniaxial strain, with scattering curves being obtained at each step. The increase in scattering intensity upon crazing is attribute…
A stable histone core complex containing equimolar ratios of H2A, H2B, H3, and H4 has been isolated from chicken erythrocyte chromatin in high salt. This complex has been characterized by sedimentation and chemical cross-linking studies. In velocity ultracentrifugation, only one single sharp sedimentation boundary has…
Abstract X-ray superlattice reflections, infrared spectroscopy, and chemical analyses have established that cetylpyridinium bromide (CPB) is highly ordered when adsorbed on vermiculite. The molecules, which stand at about 57° to the silicate surface, form close-packed arrays. Full surface coverage is achieved only for…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTA comparative study of the pyrolyses of the tetramethyl derivatives of silicon, germanium, and tin using a wall-less reactorJay E. Taylor and Thomas S. MilazzoCite this: J. Phys. Chem. 1978, 82, 8, 847–852Publication Date (Print):April 1, 1978Publication History Published online…
Results of Seebeck and resistivity measurements on carefully grown pure single crystals of NiO are shown to be inconsistent with predictions based on itinerant carrier models. A new model for hopping conduction, which contains a dependence of the hopping activation energy on spin ordering, is proposed and used to pred…
The first peralkylated complexes of metals in the lanthanoid series have now been synthesized. The compounds are extremely sensitive to air and moisture but decompose only slowly at their melting points of 138–139°C (M Er) and 141–142°C (M Lu). equation image