Materials Literature
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Fretting corrosion of stainless-steel round hole plates and spherical head screws was studied using a simulator that produced a rocking motion of the heads in the plate holes. Experiments were run for 7 days, with the simulator producing 1 oscillation/s for 16 h/day. Fretting corrosion was studied in 0.9% NaCl and in…
A rational function approximation for magnetization curves and hysteresis loops is presented. This approximation leads to Rayleigh relations and the law of approach to saturation as limit forms. Furthermore, the magnetic permeability and the magnetic energy density is computed. Finally, this analysis is applied to com…
Reduction of Pt/Ti02 at 573 K leads to the formation of a Ti3+ ESR signal, which disappears after a subsequent evacuation at 573 K. Readmission of hydrogen at room temperature makes the signal reappear.Such a reversibility is not observed when reduction takes place at 773 K.These observations are explained by a spillo…
The solid‐state reactions occurring in the system PbO‐TiO 2 ‐ZrO 2 were investigated using constant heating rates up to 1000°C. DTA, dilatometric length changes, and XRD analysis were used for characterization. PbO and TiO 2 reacted exothermally to form the product PbTiO 3 with a large volume expansion between 450° an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spinning, and fiber mechanical properties of poly(p-phenylenebenzobisoxazole)E. Won Choe and Sang Nim KimCite this: Macromolecules 1981, 14, 4, 920–924Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981h…
Reviews the vibronic properties of point defects (i.e. impurities and radiation-induced defects) in diamond. Cases discussed are: defects where the totally symmetric electron-lattice interaction dominates; cases of dynamic Jahn-Teller distortions; vibronic interactions between nearly degenerate states and a statically…
An approximate analysis is presented of the toughening induced by the incorporation of second‐phase particles subject to microcrack‐ing. It is demonstrated that the toughening becomes appreciable for a narrow size distribution of particles of appropriate size. The magnitude of the toughening is determined by the misma…
The interfaces formed by evaporating copper, nickel, and chromium layers on polystyrene, polyvinyl alcohol, polyethylene oxide, polyvinyl methyl ether, polyvinyl acetate, and polymethyl methacrylate have been studied with x-ray photoemission spectroscopy (XPS). The adhesion strengths of the metal films to the polymers…
The thermally induced in vitro self-assembly of collagen molecules to form active fibrils illustrates that collagen molecules themselves contain all of the structural information necessary for assembly. The molecule contains three structural domains, the NH2 and carboxyl-terminal extra helical regions (the telopeptide…
Abstract It is shown that the depth distribution of X‐ray production in the electron microprobe can be accurately described by a Gaussian modified at the sample surface by a transient. Assuming that the Gaussian is a consequence of the electrons undergoing a random walk in the sample and that the transient corresponds…
We discuss new anode geometries, employing position-dependent charge partitioning, which can be used with microchannel plates, planar proportional counters, and mesh dynode electron multipliers to obtain a two-dimensional position signal from each detected photon or particle. Only three or four anode electrodes and si…
A three-dimensional solid with an equilibrium concentration of unbound dislocation loops displays a resistance to torsion not present in isotropic liquids. There is residual bond-angle order analogous to that found in the two-dimensional hexatic phase. A bulk phase with bond orientational order may be observable in su…
A set of symbols based on the minimum subset of Seitz matrices required to generate the complete symmetry may be derived for each of the three-dimensional crystallographic space groups. This has a number of desirable properties including explicit information on the choice of origin. It also leads to a simple and gener…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid-rod polymers. 1. Synthesis and thermal properties of para-aromatic polymers with 2,6-benzobisoxazole units in the main chainJames F. Wolfe and F. E. ArnoldCite this: Macromolecules 1981, 14, 4, 909–915Publication Date (Print):July 1, 1981Publication History Published o…
The reflection properties of pressed polytetrafluoroethylene powder have been under investigation by the Radiometric Physics Division at the National Bureau of Standards for the past five years. This material has a great potential use, both as a standard of diffuse reflectance and as a coating for integrating spheres…
Abstract Films of chitosan, prepared by different fabrication processes, were examined at several structural levels, from the molecular to the macroscopic. This revealed the presence of polymorphic crystal forms, which varied with film treatment. Similarly, morphological structures varying from spherulites to rods wer…
A qualitative theory of the macroscopic dynamics of nucleus-nucleus collisions is presented. Attention is focused on three degrees of freedom: asymmetry, fragment separation, and neck size. The physical ingredients are a macroscopic (liquid-drop) potential energy [1], a macroscopic dissipation (in the form of the Wall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid-rod polymers. 2. Synthesis and thermal properties of para-aromatic polymers with 2,6-benzobisthiazole units in the main chainJames F. Wolfe, Bock H. Loo, and F. E. ArnoldCite this: Macromolecules 1981, 14, 4, 915–920Publication Date (Print):July 1, 1981Publication Hist…
W H de Jeu 1980 New York: Gordon and Breach ix + 133 pp price $32 It is to be regretted that the practice is growing, even among those knowledgeable in the field, of writing about liquid crystals as though a single type existed and the two processes for their formation produced similar molecular distributions. The dis…
A rigorous coupled-wave approach is used to analyze diffraction by general planar gratings bounded by two different media. The grating fringes may have any orientation (slanted or unslanted) with respect to the grating surfaces. The analysis is based on a state-variables representation and results in a unifying, easil…