Materials Literature
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The author presents the results of measurements of the effect of uniaxial tensile stresses of up to 85 MPa on Barkhausen activity and magnetic properties of AISI 4130 and AISI 4140 steels. The results show that maximum Barkhausen activity occurred very close to the coercive point. The Barkhausen peak height and the to…
Energy functionals for the Preisach hysteresis operator are used for proving the existence of weak periodic solutions of the one-dimensional systems of Maxwell equations with hysteresis for not too large right-hand sides. The upper bound for the speed of propagation of waves is independent of the hysteresis operator.
John J. Lee, M. E. McEnery, B. Ter Kuile, J. Erez, , R. F. Rockwell, W. W. Faber Jr., A. Lagziel, Identification and Distribution of Endosymbiotic Diatoms in Larger Foraminifera, Micropaleontology, Vol. 35, No. 4 (1989), pp. 353-366
Abstract
CB15/E9 mixtures submitted to an electric field exhibit a tetragonal phase BPX, having a D10 4(I4122) symmetry and two hexagonal phases BPH3d and BPH2d The Kossel diagram technique allows us (a) to confirm the hexagonal symmetry of BPH3d and to determine precisely its space group D2 6 (P6222) and (b) to study the fiel…
Abstract The oxidation of maltodextrins and starch with aqueous alkaline sodium hypochloride has been studied. At an oxidant level of 3 moles hypochlorite per anhydroglucose unit at pH 8–9, a C2, C3‐glycol‐cleaved dicarboxy polysaccharide was obtained containing up to 45% ring‐opened glucose units. Hydrolysis of the o…
Intrinsic coercivities as large as H/sub ci/=7.8 kOe were obtained in Sm-Fe-V alloys magnetically hardened by melt-spinning. As-quenched Sm/sub 0.87/Fe/sub 10/V/sub 2/ ribbons melt-spun at a substrate velocity of 20 m/s have an intrinsic coercivity H/sub ci/=6.9 kOe and remanence B/sub r/=5.1 kG. The Curie temperature…
Ultrafine, nearly spherical particles of CoFe/sub 2/O/sub 4/ were prepared under mild hydrothermal conditions. These ferrite particles were found to be superparamagnetic with a narrow particle size distribution in the range 10.0-40.0 nm. The hydrothermal ferrite powders could be sintered to almost theoretical density…
Measurements of thermal conductivity on conventional and newly developed electronic ceramics are presented as part of an effort to incorporate the new high-thermal-conductivity ceramics into microcircuit manufacturing. Motivated by large variations in values claimed by different vendors for ostensibly similar material…
The preparation, X-ray crystal structures, conductivities, and preliminary spectroscopic characterization of new charge transfer salts of general formula (D)32+ P2–, where D is an organic donor and P hexatungstate (or molybdate) acceptor dianions having the Lindquist structure, are given.
Abstract Pedogenic calcite‐crystal coatings on clasts were examined in four soils along an altitudinal gradient on Kyle Canyon alluvium in southern Nevada. Clast coatings were studied rather than matrix carbonate to avoid the effects of soil matrix on crystallization. Six crystal sizes and shapes were recognized and d…
The effect of deformation-induced martensite on the tensile behavior of metastable austenitic stainless steel has been investigated on a AISI Type 301 stainless steel containing a small amount of copper using the X-ray diffraction technique and transmission electron microscopy. The formation of martensite during tensi…
An α-unsaturated ketone and acetone undergo a selective coupling to an α-unsaturated vic-diol, under the influence of a zinc–copper couple and ultrasonic irradiation in aqueous acetone suspension.
Supported reagents prepared by adsorption of chromium(VI) and manganese(VII) on alumina are capable of catalysing the aerial oxidation of organic substrates.
The authors describe the experimental testing of the accuracy of the classical and generalized (nonlinear) Preisach models of hysteresis. The experiments performed for two typical magnetic tape materials show that both models are about equally accurate when the reversal values of the magnetic field are larger than or…
The intermetallic precipitates in Zircaloy are generally considered to be of special importance for the properties of the alloy. However, basic feature of the precipitate formation, such as the solubility limits of iron and chromium in a ZrSn matrix, are still unknown. Investigations have been performed with the objec…
Clear 3/8'' Lucite rod models at a scale of 1'' = D (the native-type period), and using four different colored ribbon markers to indicate one set of 'equivalent bands' in the SLS band pattern, clearly show the possible distribution of 'holes' and staining loci in native-type fibrils. Close-packed ordered arrays of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-Hikaru Ichida, Kenji Nagai, Yukiyoshi Sasaki, and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 586–591Publication Date (Print):January 1…
Studies of a wide range of intramolecularly five-co-ordinated silicon compounds with chelating nitrogen donors have been made, with a view to obtaining further information on the details of nucleophilic substitution reactions at silicon. The crystal structure of 2-(dimethylaminomethyl)-phenyl-1 -naphthylsilane has bee…
Thin films of polyimide were prepared by spin coating the poly(amide–acid) precursor onto copper and aluminum substrates, followed by the usual heat treatment to promote imidization (curing) of the film. Films prepared on aluminum substrates were completely cured during the heat treatment, as shown by x-ray photoelect…