Materials Literature
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BACKGROUND: Smooth muscle cell proliferation plays a major role in the genesis of restenosis after angioplasty or vascular injury. Local application of agents capable of modulating vascular responses, including smooth muscle cell proliferation, has been achieved, but difficulty in maintaining active levels locally has…
Abstract A three-dimensional modeling technique is used to characterize the structure of carbon-black aggregates. The relative positions of individual particles in aggregates are determined using transmission electron microscopy (TEM). Data are acquired from two-dimensional projections taken with the aggregates at two…
This paper examines the in situ growth and stability of a single bubble in an effective porous medium, where the pore microstructure is neglected. The main objective of the study is the effect of mass transfer and flow parameters on bubble stability. Because it is necessary for flow in both phases to be considered, th…
A method for the structure refinement of composite crystals based on the multidimensional formalism of Janner & Janssen [Acta Cryst. (1980), A36, 408–415] and successfully applied to `LaCrS3' and M10CuI7O29 (M= Bi0.031Ca0.564Sr0.405) [Kato (1990). Acta Cryst. B46, 39–44] is fully described. This method is also applica…
By incorporation of an achromatic three-reflection quarterwave retarder to a spectroscopic ellipsometer and application of appropriate calibration and error correction procedures, it has been possible to characterize real thin-film fluoride optical coatings that are inhomogeneous. The refractive index and its dispersi…
Abstract A comparative study of warpage, global shrinkage, and residual quench stresses developed in rotational molding is made for a series of thermoplastics including various polythylenes, polypropylene, polyamide‐6, polycarbonate, and polystyrene. The influence of rate of quench on uniaxial stress strain and impact…
This article provides an in-depth study of the photoluminescence (PL) and photoluminescence excitation (PLE) from Al0.48In0.52As grown by molecular beam epitaxy that exhibits linewidths of ∼17 meV, comparable with the best reported to date. When the sample temperature is increased from 2 K the emission energy exhibits…
In recent years there has been an increasing interest in the study of intercalated catalysts. Most of these studies are based on Raman and infrared (IR) spectra to explain the properties of the intercalated layer silicates, and many of them are studies of intercalated compounds in kaolinite. The vibrational bands of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosubstitution of Two Iron Pentacarbonyl CO's in Solution via a Single-Photon Process: Dependence on Dispersed Ligands and Role of Triplet IntermediatesSuresh K. Nayak, Gerard J. Farrell, and Theodore J. BurkeyCite this: Inorg. Chem. 1994, 33, 10, 2236–2242Publication Dat…
Abstract In soils low in organic matter but high in clay mineral content, the fixation and release of NH 4 by soil clay may have a significant impact on available N, in addition to the organic N. The objective of this work was to evaluate the contribution that nonexchangeable NH 4 , newly fixed by clay minerals, may h…
Effective conjugation coordinate (ECC) theory has previously been used to interpret the Raman spectra of oligopyrroles and polypyrrole, providing information on conjugation and delocalization. However, the materials used in real applications have long alkaline side chains (to aid solubility), which leads to conformati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and Electronic Spectra of (3-chloroanilinium)8[CuCl6]Cl4: Evidence for Tetragonally Elongated CuCl64- Ions with the Long Axis Disordered in 2-DimensionsHorst Stratemeier, Burghard Wagner, Elmars R. Krausz, Rolf Linder, Hans Herbert Schmidtke, Juergen Pebler, William E. H…
Abstract An electrochemical cell, Pd | YSZ | Pd, was constructed to remove both NO and CH4 from an oxidizing atmosphere. When the direct current was supplied to the cell at 700 °C in the reactant flow containing 1000 ppm NO, 1000 ppm CH4 and an excess amount of O2, NO was reduced to N2 at the cathode, and CH4 was oxid…
The distribution of keratan sulphate (KS) in normal endometrium has been studied by immunohistochemistry using monoclonal antibody 5D4. KS is present in association with glandular epithelium throughout the normal cycle. Production is hormonally regulated, as indicated by the significant increase observed in the secret…
Abstract The effectiveness of predicting rubber performance based on measured silica physical properties in silica- and carbon black-filled compounds is presented for three rubber formulations: an off-the-road tire tread, a wire coat stock and a V-belt. Correlation and regression analyses were performed using SAS soft…
An acid phosphatase containing a 27-kDa polypeptide component has been identified in Escherichia coli by means of a zymogram technique. The enzyme is secreted in the periplasmic space and is able to hydrolyze several organic phosphate esters, but not diesters, showing preferential activity on p-nitrophenyl phosphate a…
In A2BX4 structures which are isostructural to β-K2SO4 (with A being a monoatomic cation) there are two crystallographically independent cations surrounded by 11 and 9 X-atoms. The 11-coordinated cation is less firmly bound and the arrangement of its five closest neighbours is irregular. One of these contacts is appro…
Abstract A direct optimization method to estimate nucleation and crystal growth rate parameters from seeded batch cooling crystallization experiments is evaluated. The experimental information applied comprises the concentration of the solution and the temperature as functions of time and the final product size distri…
The viscosity of a monolayer of a suspension of bimodally distributed hard spheres is determined for area fractions, φa, from 0.15 to 0.74 with different particle size ratios, λ (diameter of large sphere/diameter of small spheres=1, 2, and 4), and different fractions of small spheres of total solids, ξ (0.07, 0.27, 0.…
The effects of softened fabrics on the skin were evaluated by a forearm wet and dry test, under conditions simulating real-life skin contact with fabrics. 15 volunteers with sensitive skin according to dermatological assessment and their own recognition entered a double-blind 12 day, 3 sessions per day, forearm wettin…