Materials Literature
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The Raman spectra of YFe${\mathrm{O}}_{3}$, SmFe${\mathrm{O}}_{3}$, DyFe${\mathrm{O}}_{3}$, HoFe${\mathrm{O}}_{3}$, and ErFe${\mathrm{O}}_{3}$ have been measured as a function of temperature from 8 to 650 K. For all the materials, the spectra show two features in the 5 to 20 ${\mathrm{cm}}^{\ensuremath{-}1}$ range. Fr…
The article begins with an account of prewar German work, particularly that of von Ardenne, who established the theoretical basis of a scanning electron microscope and constructed an instrument which was primarily intended to overcome chromatic aberration when relatively thick specimens were examined by transmission.…
Examination of the three-dimensional structure of periphyton communities through time indicated that their microsuccession is analogous to higher plant succession. The development of attached diatom communities in two reservoirs was studied using artificial substrates, and the morphology of dominant organisms, pattern…
The fluorescence of molecules on silver-island films exhibits nonexponential decay and is several orders of magnitude more rapid than on a silica surface, while the total emission intensity is slightly increased. This behavior results from the electromagnetic coupling between the fluorescing molecules and the plasmon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalcium carbonate crystallization kineticsLarry D. Swinney, John D. Stevens, and Robert W. PetersCite this: Ind. Eng. Chem. Fundamen. 1982, 21, 1, 31–36Publication Date (Print):February 1, 1982Publication History Published online1 May 2002Published inissue 1 February 1982htt…
The multiple-trapping model is used in order to analyse the propagation and broadening of a carrier packet. The traps are considered to be distributed over rather a wide energy region in the gap. We assume that at the initial moment traps are empty and all the carriers occupy mobile states. Under these conditions the…
Several peptides containing intermolecular crosslinks were isolated from tryptic digests of the insoluble matrix of human leiomyoma and calf aorta. From leiomyoma type III collagen, two crosslinked peptides were isolated. The peptide [T N (III)] 2 , is a dimer which contains the 73 amino‐terminal residues of two, zero…
Abstract The effect of initiation of ϵ‐caprolactone polymerization with mono‐ and polyfunctional alcohols was investigated. The resulting linear and starshaped polymers were characterized by measurement of the molecular weight and molecular weight distribution. The polymerizations were characterized by (1) rapid initi…
Abstract Nonstoichiometry and point defect structure of magnetite have been studied experimentally by thermogravimetry covering the stability range of magnetite between 900 and 1400 °C. A cation deficit is observed at high and a cation excess at low oxygen activities corresponding to cation vacancies and iron intersti…
Multiple electron scattering between weak beams has been used as the basis for a simple method to determine the absolute polarity of some non-centrosymmetric crystals. For crystals with the sphalerite structure many orientations have been found in which small departures from centrosymmetry produce large effects on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface spectroscopic characterization of cobalt-alumina catalystsRoland L. Chin and David M. HerculesCite this: J. Phys. Chem. 1982, 86, 3, 360–367Publication Date (Print):February 1, 1982Publication History Published online1 May 2002Published inissue 1 February 1982https:/…
Abstract The fundamental properties of 12-heteropolyacids of Mo and W, such as the structure, the surface area, the acidity, and the reduction-oxidation mechanism, have been studied in their solid state in relation to heterogeneous catalysis. The primary structure (heteropolyanion) was rather stable, but the secondary…
We have developed a line of Chinese hamster ovary cells with a 500-fold increase in 3-hydroxy-3-methylglutaryl-coenzyme A reductase, the membrane-bound enzyme that controls cholesterol synthesis. This line, designated (UT-1, was obtained by stepwise adaptation of cells to growth in increasing concentrations of compact…
The infrared transmission and reflection spectra of Co II Co III 2 O 4 , CoAl 2 O 4 , ZnFe 2 O 4 and MnFe 2 O 4 and the single crystal Raman spectra of Co II Co III 2 O 4 and CoAl 2 O 4 have been measured. The frequencies of the transverse (TO) and longitudinal (LO) modes of the infrared active species have been obtai…
A classical result due to Daniels is that the strength of a bundle of parallel fibres is asymptotically normally distributed. Extensions of this result are obtained and applied to a series-parallel model consisting of a long chain of bundles arranged in series. This model is of importance in studying the reliability o…
Abstract Viscosity and light-transmission measurements of dilute suspensions of montmorillonites having different exchangeable cations were used to calculate relative particle sizes as a function of cation composition, where particle size is expressed as the number of clay plates per tactoid relative to the number of…
ZnO films have been prepared by rf sputtering a Zn target in a planar magnetron system with controlled Ar/O2 gas mixtures. The films were deposited on unheated glass substrates which were either stationary in front of the target or in constant motion. Both the system pressure and plasma impedance changed when an oxide…
Theoretical conformational energy calculations show that large changes in the width of the binding-site cleft in the L-arabinose-binding protein involve only modest changes in the protein internal energy. Solvation energy changes associated with such variations of the cleft width and with protein-ligand interactions a…
Examination of the three‐dimensional structure of periphyton communities through time indicated that their microsuccession is analogous to higher plant succession. The development of attached diatom communities in two reservoirs was studied using artificial substrates, and the morphology of dominant organisms, pattern…
Abstract The adsorption of uncharged polymers by clays is largely “entropy-driven.” Polymer conformation changes from a random coil in solution to an extended form at the surface in which adsorbed polymer segments or trains alternate with loops and tails extending away from the surface. Although the net interaction en…