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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…
We study the asymptotic behavior as ε → 0^+ of solutions of the variational problems for the Van der Waals–Cahn–Hilliard theory of phase transitions in a fluid. We assume that the internal free energy, per unit volume, is given by ε^2|∇ρ|^2 + W(ρ) and the contact energy with the container walls, per unit surface area,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer complexes as potential organic ferromagnetsTeresa J. LePage and Ronald BreslowCite this: J. Am. Chem. Soc. 1987, 109, 21, 6412–6421Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt-catalyzed epoxidation of olefins. Dual pathways for oxygen-atom transferJ. D. Koola and Jay K. KochiCite this: J. Org. Chem. 1987, 52, 20, 4545–4553Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a solid-state polyaniline-based transistor: water vapor dependent characteristics of a device employing a poly(vinyl alcohol)/phosphoric acid solid-state electrolyteShuchi Chao and Mark S. WrightonCite this: J. Am. Chem. Soc. 1987, 109, 22, 6627–6631Publi…
is a petrographic term used to indicate highly birefringent, fine-grained, micaceous material that is viewed under the optical microscope. Other analytical techniques, including X-ray diffraction (xno) analysis, transmission-electron microscopy (reu), and chemical analysis, reveal that sericite from the Silverton cald…
A weighted form of the Durbin–Watson d statistic [Durbin & Watson (1971). Biometrika, 58, 1–19] has been used to quantify the serial correlation between adjacent least-squares residuals in Rietveld refinements of step-scan powder diffraction data. Analyses of X-ray and neutron data from a range of materials have shown…
The glass formation region in the yttria‐alumina‐silica system was investigated. Properties of glasses containing 25 to 55 wt% yttria were measured and the effect of the composition was determined. The density, refractive index, thermal‐expansion coefficient, and microhardness increased with increasing yttria content.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface ordering phenomena in block copolymer meltsGlenn H. FredricksonCite this: Macromolecules 1987, 20, 10, 2535–2542Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://pubs.acs.org/doi/10.1021/ma00…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGreatly enhanced second-order nonlinear optical susceptibilities in donor-acceptor organic moleculesH. E. Katz, K. D. Singer, J. E. Sohn, C. W. Dirk, L. A. King, and H. M. GordonCite this: J. Am. Chem. Soc. 1987, 109, 21, 6561–6563Publication Date (Print):October 1, 1987Publ…
The melting temperatures of natural and synthetic monazite and xenotime (rare‐earth ortnophosphates) were measured, using a heliostat‐type solar furnace. The results obtained are as follows: natural monazite from Japan (2057°40°C), synthetic monazite RPO 4 (R=La, 2072°20°C; R=Ce, 2045°20°C; R=Pr, 1938°20°C; R=Nd, 1975…
The alumina‐silica phase relations of samples annealed in oxygen and quenched were studied by optical microscopy, image analysis, X‐ray diffraction, and the electron microprobe. The solid solution boundaries of mullite changed with increasing temperature and joined at 1890°C and a composition of 77.15 wt% alumina. The…
The content of type I and III collagen in normal human skin from subjects of different ages was studied by means of a new high performance liquid chromatography method and by SDS-polyacrylamide gel electrophoresis and scanning electron microscopy. The ratio of types I and III collagen in covered skin remained constant…
Transformation toughening in ZrO 2 ‐containing ceramics is discussed. Specifically, microstuctures of the three distinct types of ZrO 2 ‐toughened ceramics are presented, after which microstructural evolution in MgO‐partially‐stabilized ZrO 2 Mg‐PSZ) is reviewed. The mechanical properties of such transformation‐toughe…