Materials Literature
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The stress corrosion cracking (SCC) of aluminum alloys is a well-documented phenomenon, but there is considerable disagreement in the scientific literature as to what mechanism causes it. This paper reviews the past 10 years of publications and describes the experimental methods and the proposed SCC mechanisms of abou…
In situ monitoring of mass change was performed during electrochemical growth and redox cycling of a conducting polymer(polypyrrole) on a quartz crystal microbalance. For the polypyrrole films grown with large polymeric anions(poly(4‐styrenesulfonate) and polyvinylsulfonate), mostly cations and solvent molecules were…
Pseudomonas oleovorans accumulates poly(3-hydroxyalkanoates) (PHAs) after growth on medium chain length hydrocarbons. Large amounts of this polyester are synthesized when cells are grown under nitrogen-limiting conditions. When nitrogen is resupplied in the medium, the accumulated PHA is degraded. In this paper, we de…
Diamond films, produced by microwave plasma assisted chemical vapor deposition, were studied using cathodoluminescence (CL) scanning electron microscopy and spectroscopy techniques. Luminescence intensities of the observed prominent peaks at 420, 445, and 738 nm were found to vary widely as a function of both the depo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of molybdenum(3d) XPS spectra of supported molybdenum catalysts: an alternative approachWolfgang Gruenert, A. Yu. Stakheev, Reinhard Feldhaus, Klaus Anders, E. S. Shpiro, and Kh. M. MinachevCite this: J. Phys. Chem. 1991, 95, 3, 1323–1328Publication Date (Print):Feb…
In order to explain discontinuous brittle cracking in materials subjected to hydrogen, single-crystal and crack/dislocation simulation studies have been made. The computational scheme allows the local stress tensor near a crack in an anisotropic elastic solid with shielding dislocations to be determined. The model sys…
Waste products of the shellfish industry have applications as diet supplements and in food processing waste management, beverage clarification, and the production of packaging films
The first part of this report deals with a new linear model of the capacitor. It is based entirely on old concepts and results that have not been combined before. The model current after a voltage step at t = 0 is proportional to t − n where n is a number less than but close to one. In the frequency domain losses are…
The 29Si and 23Na NMR, Raman, and infrared spectra of glasses quenched from liquids at pressures up to 12 GPa for three alkali silicate compositions (Na2Si2O5, Na2Si4O9, K2Si4 O9) and silica (SiO2) reveal systematic changes in the melt structure with pressure. The most novel change is the occurrence of [5]Si and [6]Si…
The attachment, spreading, spreading rate, focal contact formation, and cytoskeletal organization of human umbilical vein endothelial cells (HUVECs) were investigated on substrates that had been covalently grafted with the cell adhesion peptides Arg-Gly-Asp (RGD) and Tyr-Ile-Gly-Ser-Arg (YIGSR). This approach was used…
We present an analytical treatment of the problem of pattern selection in a fully non-local symmetrical model of dendritic crystal growth. Simplifications of mathematical equations are based on the assumption that anisotropies of surface energy and kinetic effects are small. Selection rules for growth velocity and ins…
The fracture toughness of ceramics can be improved by the incorporation of a variety of discontinuous, elastic reinforcing phases that generate a crack‐bridging zone. Recent models of toughening by crack‐bridging processes are discussed and used to describe the behavior observed in whisker‐reinforced ceramics. The tou…
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Abstract Hydrosilation of methylenecyclohexane and hex‐1‐ene by octa(hydridosilsesquioxane) catalysed by hexachloroplatinic acid is a new route to polyhedral organylsilsesquioxanes. Quantitative yield of octa(cyclohexylmethylsilsesquioxane) is reached. This reaction opens a vast field of yet unknown polyhedral silsesq…
Abstract The efficiency of aromatic ketones as singlet‐oxygen ( 1 O 2 ( 1 Δ g )) sensitizers can vary considerably with the electronic configuration of their lowest triplet state and the solvent used. Near‐infrared measurements of tie luminescence of singlet oxygen have shown that the quantum yield of singlet‐oxygen p…
Co K-edge near-edge X-ray absorption spectra are reported for RECoO 3 (RE=Y, Ho, Gd, Nd) at 300 K and for LaCoO 3 in the temperature range (140<or=T<or=830 K). The pre-edge structure associated with Co 1s to 3d excitation is found to be comparable for all the cobaltates at room temperature, consistent with the propose…
When polyimide (Kapton) or polybenzimidazole (PBI) are irradiated by a 248 nm KrF laser, their electrical conductivity is increased permanently. Conductivity increases of up to fifteen orders of magnitude were observed, and conductivities on the order of 1–10 Ω−1 cm−1 were obtained. The laser-induced conductivity incr…
We have developed an acellular matrix vascular prosthesis (AMVP) made by detergent and enzymatic extraction of natural arteries, yielding a tissue framework of collagen and elastin from the original vessel, with preservation of the natural basement membrane at the blood flow surface. These biografts have excellent han…
It is shown that, given two arbitrary lattices of equal density in the Euclidean space R n , a bounded quasi-periodic and piecewise affine vector field nu on R n (a so-called 'modulation field') can be built so that the second lattice is the image of the first one under the map x to x-v(x). The proof relies on a facto…
Experimental verification is made of a new polarization splitter which utilizes artificial anisotropic dielectrics. The splitter is composed of layers of periodically laminated SiO2/TiO2 thin films. The SiO2 and TiO2 films are alternately deposited by rf sputtering and reactive dc sputtering, respectively. The thickne…