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Results are reported of an investigation using synchrotron radiation into the effects of temperatures up to 1173 K on pressure-induced phase transitions in phosphorus. A cubic type multi-anvil press was employed and a diffraction pattern in an energy-dispersive mode was taken for a period of time, typically 200 s, wit…
Abstract Dynamic mechanical behavior and X‐ray diffraction of two series of segmented polyurethaneimides (PUI) prepared either from poly(ethylene adipate) glycol (PEA), pyromellitic dianhydride (PMDA) and 4,4′‐diphenylmethane diisocyanate (MDI), or from PEA, PMDA, and a mixture of 2,4‐ and 2,6‐tolylene diisocyanate (T…
The following side reactions occurring in the formation of polyurethanes were modeled: a reaction of excess phenyl isocyanate either with 1-butanol in 1, 4-dioxane and in bulk, or with n-butylphenyl urethane or water in dioxane catalyzed with dibutyltin dilaurate that leads to the formation of n-butyl-α, γ-diphenyl al…
The effects of low concentrations of seven different substitutional impurities on the phonon thermal conductivity of iron were determined at 300 K. Of the seven solutes, Ni caused the smallest reduction and W the greatest. The data were analyzed on the basis of Callaway’s model, and the resulting impurity scattering w…
Abstract Saponites and vermiculites may assume at least 11 ordered or semi-ordered layer stacking sequences. For a given relative humidity, the layer stacking type assumed is a function of the nature of the interlayer cation, the layer charge density, the mean size of the particles, and the di- or trioctahedral charac…
John P. Kociolek, Eugene F. Stoermer, Ultrastructure of Cymbella sinuata and its Allies (Bacillariophyceae), and Their Transfer to Reimeria, Gen. Nov., Systematic Botany, Vol. 12, No. 4 (Oct. - Dec., 1987), pp. 451-459
Effects of various elemental additives on the electrical resistivity of hot‐pressed SiC ceramics were studied. The electrical resistivity at room temperature of dense SiC ceramics varied greatly depending on the additives used. SiC ceramics with added Be had an extremely high electrical resistivity of 3 × 10 12 °.cm.…
X-ray powder diffractometry with storage-ring radiation was used to test various aspects of a method for refining simple crystal structures (Si, CeO2 and Co3O4). Excellent powder patterns were obtained with 0.17° resolution parallel slits and 1 Å X-rays. The intensities were determined with a double-Gaussian profile-f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal analysis of the conformational disorder in semicrystalline poly(vinylidene fluoride) and poly(trifluoroethylene)Kyriakos Loufakis and Bernhard WunderlichCite this: Macromolecules 1987, 20, 10, 2474–2478Publication Date (Print):October 1, 1987Publication History Publi…
Abstract The effects of chemical reduction of structural Fe 3+ in nontronite SWa-1 (ferruginous smectite) on intervalence electron transfer (IT) and magnetic exchange were investigated. Visible absorption spectra in the region 800-400 nm of a chemical reduction series of the SWa-1 nontronite revealed an IT band near 7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical studies of transition-metal hydrides. 2. Calcium monohydride(1+) through zinc monohydride(1+)J. Bruce. Schilling, William A. Goddard, and J. L. BeauchampCite this: J. Phys. Chem. 1987, 91, 22, 5616–5623Publication Date (Print):October 1, 1987Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral route to .mu.-hydroxo-bis(.mu.-acetato)-bridged heterometal dinuclear complexes. Syntheses, magnetic and redox properties, electronic spectra, and molecular structures of the [Cr(III)-Co(II)] and [Cr(III)-Fe(II)] speciesPhalguni Chaudhuri, Manuela Winter, Heinz Josef…
Abstract MnS thin films on glass substrates prepared by thermal vacuum evaporation show zincblende/wurtzite and rocksalt structure, respectively in dependence of the substrate temperature. The thermal‐treatment induced transition from the tetrahedrally (ZB/W) into the octahedrally (RS) coordinated phase is studied opt…
Expressions for the sintering rate in liquid‐phase sintering are derived for coupled‐interface dissolution and liquid‐phase diffusion. The analysis reveals the important role of stress gradients in the grain boundary phase and also shows that such gradients cannot be supplied by liquid‐phase flow. Stress‐supporting st…
The XPR2 gene encoding an alkaline extracellular protease (AEP) from Yarrowia lipolytica was cloned, and its complete nucleotide sequence was determined. The amino acid sequence deduced from the nucleotide sequence reveals that the mature AEP consists of 297 amino acids with a relative molecular weight of 30,559. The…
Mechanisms of cell deposition from a sessile liquid phase and adherence to various plastic substrates have been investigated by measurement of short-term (less than 120 min) cell-attachment rates. Sigmoidal attachment-rate curves were fit with a three-parameter variant of a logistic equation to quantify parameters rel…
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A detailed examination has been undertaken of the influence of surface treatment on the adhesion of polyethylene fibres to epoxy resin. The pull-out adhesion has been determined for untreated, chromic acid treated, and plasma etched monofilaments with different draw ratios and thermal annealing treatments. In a few ca…
Linkage of 15 tetragonal VO5 pyramids gives rise to the spherical anion [V15O36]5⊖ 1, which is formally a VV system. The 15 vanadium atoms are arranged on the surface of a sphere and are 343 ± 10 pm from the center, which is occupied by a Cl⊖ ion. The isopolyvanadate is part of the salt [NMe4]6[V15O36]·Cl·4H2O, which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction through extended molecular bridges: magnetic properties of .mu.-4,4'-bipyridine and .mu.-pyrazine copper(II) binuclear complexes and crystal structures of (.mu.-4,4'-bipyridine)bis[(diethylenetriamine)(perchlorato)copper(II)] perchlorate and aquo(4,4'-bi…