Materials Literature
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The total power loss under alternating flux at power frequencies and zero applied stress conditions is an important criterion for the manufacturer and user of soft magnetic materials. The total power loss may be divided into three major types, namely the static hysteresis loss, classical eddy current loss and excess e…
During ageing, proteinaceous media undergo various chemical and structural alterations to acquire new physico-chemical properties. The action of light, oxygen and interactions between mixed media components are discussed. The influence of some conservation treatments is considered.
The centers [AlO 4 /M + ] + , formed in α-quartz by X-irradiation at 77 K, contain an aluminum ion substituted for a silicon ion, with an electron removed from a neighboring oxygen by the ionizing radiation. In addition, there is an interstitial ion M + which acted as a charge compensator before the irradiation. Cente…
Abstract The reducibility of La1-xSrxCoO3 (a perovskite-type mixed oxide) remarkably increased with the Sr2+ content, x, but the rate of re-oxidation of the reduced catalysts decreased with x. These trends well explain the catalytic activity for oxidation on the basis of redox mechanism.
Abstract Recent opinions on the effect of nonmetallic inclusions, especially sulfides, on the nucleation of pits, stress corrosion cracks, and hydrogen‐induced cracks are reviewed. The nonmetallic inclusions present in steels as impurities adversely affect the corrosion resistance of steels. This is true for both the…
The EPR spectra of the title compound revealed an unusual linewidth anisotropy. The anisotropy showed behavior characteristic of relaxation effects due both to exchange anisotropy and to spin diffusion. This is the first ferromagnetic layer salt of the ${(R\mathrm{N}{\mathrm{H}}_{3})}_{2}(\mathrm{Cu}{\mathrm{Cl}}_{4})…
Amorphous silicon has been electrodeposited from nonaqueous baths using SiHCl 3 as the silicon source. A typical bath composition was 1.0 M SiHCl 3 in propylene carbonate containing 0.1M tetrabutyl ammonium chloride as the supporting electrolyte. Deposits were made potentiostatically at around −2.5V vs. Pt reference a…
Abstract This perspective embraced many factors that are important in understanding silicone elastomer technology and the reasons for the unique properties that they exhibit. The fact that they possess the lowest transition temperatures for any known polymer qualify them as a viscoelastic polymer that can be converted…
Mechanisms of corrosion at the areas of contact between screw heads and plate holes were investigated using electrochemical potential recording techniques. Static crevice corrosion was studied with plates and screws in isotonic and hypertonic saline solutions (0.9 to 7.2% NaCl). Fretting corrosion was studied in vitro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion of hydrodynamic interaction in polymer dynamical simulationsMarshall FixmanCite this: Macromolecules 1981, 14, 6, 1710–1717Publication Date (Print):November 1, 1981Publication History Published online1 May 2002Published inissue 1 November 1981https://pubs.acs.org/d…
The properties of streamer or electron avalanche pulses have been investigated for point-plane, and positive and negative dc corona discharges in gaseous SF6 over the pressure range of 50–500 kPa. Measurements were made of the voltage and pressure dependence of electrically detected corona pulse-height distributions,…
Recent studies suggest that formation of siderite is critical for the formation of highly protective, corrosion‐resistant scales in water distribution pipes. Conditions that tend to hinder siderite formation lead to higher corrosion rates and nonuniform, thick scales.
The present communication presents a single microprobe technique for measuring tissue thermal properties based on the dissipation of a measured amount of energy and the observation of the resulting temperature rise a given time later. An advantage of this method is that the effective sampling volume can be varied by v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopy of oxidized metalloporphyrins: detection of a band diagnostic of porphyrin-centered oxidationEric T. Shimomura, Martin A. Phillippi, Harold M. Goff, William F. Scholz, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1981, 103, 22, 6778–6780Publicati…
The kinetics and mechanism of oxidation of carbon atoms exposed at monolayer steps on graphite surface have been studied with the etch-decoration and transmission electron microscopy technique and two pieces of direct evidence are shown for the importance of surface diffusion in the overall kinetics. It is found that…
Rare-earth aluminates having the general formula LnMAl11O19 with Ln3+ = La, Pr, Nd, Sm, Eu, Gd, and M2+ = Mg, Ni, Co, Mn, Fe have been synthetized. This paper is devoted to mixed compounds of the series La1−xNdx Mg Al11O19 of which large single crystals have been obtained by the flame fusion method. A full refinement…
The most prominent paramagnetic impurity center in single crystal alpha-quartz X-irradiated at room temperature is [AlO 4 ] 0 , which contains an aluminum ion substituted for a silicon ion, with an electron removed from a neighboring oxygen by the ionizing radiation. A reinvestigation of this species at ca. 35 K using…
A degradation of untreated fillers in composites stored in distilled water was indicated by an increased sodium and hydroxy ion concentration in storage water, and by examination of the fillers with SEM. Silane treatment of the fillers retarded the leaching process, while cycling stresses accelerated it.
Fimbrin is a cytoskeletal protein associated with microfilaments in microvilli, microspikes, stereocilia, membrane ruffles, and cell--substratum attachment sites. Fimbrin purified from intestinal epithelial cell brush borders was found to be a monomeric protein of molecular weight 68,000. In a sedimentation assay, fim…
Raman spectra in the O–H stretching band in normal and supercooled water have been investigated. Spectra are taken as a function of temperature in the range +95 to −24°C. Absolute Raman cross sections corrected for instrumental and physical factors are obtained. It is shown that the isotropic O–H stretching bands in t…