Materials Literature
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Cobalt has been known as an element to increase the Curie temperature but to decrease the coercivity of (Nd,Dy)FeB magnets. Because of this negative effect, various elements have been added to increase the coercivity but at the expense of remanence and/or Curie temperature. The combined addition of cobalt and small am…
In a companion paper, computer programs are proposed for automating the analysis of sudden-short-circuit oscillograms in accordance with present IEC and IEEE standards. In this paper, we further illustrate the capabilities of computer-aided graphical methods with a view to their incorporation into modern testing pract…
Koninginin E, a congener of previously isolated Koninginins A, B, and C, was isolated from Trichoderma koningii fermented on a shredded wheat medium. Selective supercritical fluid extraction was used in the rapid isolation of this otherwise intractable compound. Koninginin E inhibited the growth of etiolated wheat col…
Abstract Amine‐terminated poly(dimethylsiloxanes) (ATPDMS) were used to improve the toughness of a cresol‐formaldehyde novolac epoxy resin cured with a phenolic novolac resin for electronic encapsulation application. The effect of molecular weight of amine‐terminated polysiloxanes on the phase separation of the result…
The first diazabutadiene (DAB) derivative of an actinide metal is characterised by X-ray crystallography and EPR spectroscopy; a comparison of its electrochemistry with that of other DAB complexes suggests a predominantly localised bonding mode.
Duplex stainless steel base material was welded using gas tungsten arc welding with an Ar-10%H2 shielding gas and laboratory-made filler wires were employed to deposit duplex and fully ferritic weld metals having different nitrogen contents. Weld metal slow extension rate tensile (WM-SERT) testing was used to examine…
Abstract Measurements of chemically induced dynamic nuclear polarization (CIDNP) often yield valuable and otherwise unavailable information about the mechanisms of chemical reactions. The purposes of this article are to explain the fundamentals of this spectroscopic technique in elementary terms and to show what kind…
Abstract The interest for the stereospecific polymerization of olefins discovered by prof. Natta in 1954 was so high that only a few years elapsed between the discovery and the commercialization of polypropylene. The polypropylene discovery generated a tremendous scientific and technological effort for the development…
The molecule SiC2 in the circumstellar shell around the evolved star IRC + 10216 has been mapped using the Berkeley-Indiana- Maryland Array (BIMA) millimeter-wave interferometer. In this paper we present results of a full synthesis mapping of the 4<SUB>22</SUB>-3<SUB>21</SUB> transition of SiC2. This is an improvement…
This paper describes a phenomenological model of scalar magnetic hysteresis which is based on the similarity of the processes taking place when a magnetic material is magnetized along the branches of both the main and any minor hysteresis loops. This allows one to form any reversal curve by means of conjugation of the…
We study the electron dynamics in one-dimensional periodic and aperiodic (Thue-Morse) crystals. For the periodic chain the mean-square displacement ${\mathrm{\ensuremath{\sigma}}}^{2}$(t) and the integrated autocorrelation function C(t) of a quantum wave packet put on an initial site display unlimited ballistic motion…
The deficient perovskite LaNiO2.5 has been prepared in powder form with excellent crystallinity by controlled reduction of LaNiO3 with Zr metal in evacuated ampoules at 400 °C. The neutron powder diffraction pattern could be indexed in a monoclinic unit-cell corresponding to a superstructure of perovskite with dimensi…
Information on wood sorption behavior provides desorption and adsorption curves from the green and fully dry initial conditions, respectively. Wood in service, however, is exposed to only a narrow range of relative humidities (RH) and, therefore, should exhibit intermediate isotherms that are different from those of t…
Graphite powder was coated with a chelate compound of aluminum and heated at 500°C in air to prepare Al2O3-coated graphite powder. The sedimentation volume and the heat of immersion in water indicated that the wettability of the graphite powder by water was improved by the Al2O3 coating. The oxidation resistance of Al…
Partially inverted fine powders of zinc ferrite (ZnFe/sub 2/O/sub 4/) were produced by chemical aerogel synthesis. These powders showed magnetic ordering at temperatures to 250 K. Upon ball milling, a much higher inversion parameter was attained, yielding ferrimagnetic powders having small remanence and coercive field…
Microstructural modifications of collision interface in an explosively welded Ti/Ni clad were studied by transmission electron microscopy. Nonequilibrium phases such as amorphous and icosahedral quasicrystalline phases were synthesized and locked into the collision interface. These products were concluded to be the tr…
We report here the measurement of the magnetocaloric effect in a magnetic material with the use of noncontact type detection. The technique is based on the thermoacoustic principle. A sample with a periodically changing surface temperature induces exponentially decaying pressure waves which can be detected by a sensit…
An electrochemical route to poly(p-phenylenevinylenes)(PPVs) is described which involves cathodic cleavage of bis(dibromomethyl)arenes at a mercury pool cathode. Insoluble and organosoly PPVs are obtained in good yields and are characterised as regular and linear. Copolymers are obtained by co-electrolysis of differen…
The behavior and the effect of Al4SiC4, an excellent hydration-resistant compound, as an antioxidant for carbon-containing refractories have been investigated, and the corresponding mechanisms have been discussed. Al4SiC4 added to the refractories initially reacts with CO to form Al2O3, SiC and C. After the reaction,…
The surface chemical features and sintering behaviour of two preparations of tetragonal zirconia (t-ZrO2) stabilized with 3 mol % Y2O3 have been examined, and have been compared with those of a 2 mol% t-ZrO2 preparation and a monoclinic zirconia (m-ZrO2) preparation.The adsorption of CO2 indicates that the most peculi…