Materials Literature
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Abstract The anion radical of V2(CO)8(μ-PPh2)2 and the cation radical of Mn2(CO)8(μ-AsPh2)2 are generated by chemical reduction of the vanadium complex with LiBHEt3 or potassium naphthalenide and by radiochemical oxidation of the manganese complex in frozen Freon mixture, respectively. Their anisotropic ESR spectra sh…
The generation and propagation of 9.37 GHz sound in polycrystalline iron films ∼13 μm thick is discussed. The excitation is accomplished via the magnetoelastic coupling and is optimized at FMR. No sound absorption dip or exchange asymmetry has been observed in these experiments.
Abstract Rhenium oxide supported on magnesium oxide has been investigated in order to clarify the existence and the nature of an interaction between the support and the dispersed species. Samples containing up to 5.7% by weight of rhenium, have been obtained by impregnation of magnesium oxide with an ammonium perrhena…
(1982). Tiling Rectangles with Rectangles. Mathematics Magazine: Vol. 55, No. 5, pp. 286-291.
Abstract Lattice parameters, electrical conductivity and optical absorption for Li2O doped ZnO were examined as a function of Li2O content. As the Li2O content increased, both c-axis dimension and conductivity decreased initially reaching the minima at the Li2O content of 0.05∼0.1 mol% and later increased. These resul…
A relationship between eddy current losses and a new parameter which is thought to represent an equivalent number of barlike domain walls in various soft magnetic materials is described. Eddy current losses are inversely proportional to the parameter regardless of the composition, dimensions, or heat treatment of the…
Ribbons of 6.5% Si-Fe alloy were prepared with a rapid quenching single roller method. The thickness was 10 to 90μm. After annealing these samples at 1100°C for one hour in pure hydrogen, the grain structure was observed using a 25 kV-SEM. Mechanical properties were measured with a tensile testing machine. Magnetic pr…
The chemistry and prevention of the corrosion of iron.
The reaction between CaO and MnZn ferrite is investigated by in-situ heating in a scanning electron microscope. The existence of an intermediate phase and a eutectic liquid at about 1300°C is observed. The CaO segregation behavior of low loss MnZn ferrite is studied by in-situ heating in transmission electron microsco…
Color centers in amorphous films evaporated from WO2 powder and WO3 powder were investigated. It was found that the device using ‘‘WO2’’ film, which has a WO3-like structure, exhibits a high-speed response and a high optical density, which is attributed to the enhancement in oscillator strength of the color centers in…
Ferrite cores are mainly used in filters and broad-band transformers for telecommunication and increasingly in power converters. The requirements for the material properties are different for different applications and accordingly different compositions of the ferrite materials are used. Commercially available ferrite…
Abstract Polycarbonate exhibits an extraordinary crack‐tip plastic zone under certain fatigue loading conditions. During discontinuous growth (multiple load cycles per crack jump), the plastic zone consists of a leading craze and a pair of sharply delineated shear bands, which together look like the Greek letter epsil…
The performance of a hysteresis motor can be improved greatly if it is overexcited for a short period when running at synchronous speed. The change in the magnetic state of the rotor hysteresis material when the stator voltage is raised and then reduced to the original value, is described in detail. Based on this, a m…
The soft magnetic properties of a series of metallic glasses in the Co–Fe–Ni–Mn–B–Si system are described. These glasses have very low values for saturation magnetostriction (+5 to −1 ppm) and some of the highest values for saturation induction (1.1 to 1.3 T) reported for such glasses. Most importantly, the Curie temp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interactions in heterodinuclear complexes with one ion possessing an orbitally degenerate ground state. Nickel(II)-cobalt(II) pairs in diaqua(1,4-dihydrazinophthalazine)nickel(II) chloride hydrateLucia Banci, Alessandro Bencini, Cristiano Benelli, and Dante Gattesch…
Abstract Autohesion is a particular form of adhesion. It occurs when two surfaces of the same elastomer are pressed together. The increase of the autohesive strength, with the increase of contact time, is caused by interdiffusion of mobile macro-molecule chain ends across the boundary face. After a certain time of con…
Abstract X‐ray diffraction patterns of a number of commercial bleaching earths indicate that they consist mainly of montmorillonite mixed with smaller amount of kaolinites as well as mica, quartz and cristobalite. The active sites in these earths for the adsorption of β‐carotene are identified through ion exchange and…
The ultrasonic dispersion in the incommensurate (antiferroelectric) phase of NaNO 2 has been examined by a Brillouin scattering experiment with a special emphasis on the temperature regulation near its phase transition temperatures. A slight anomaly of the frequency shift ( Δ ν) of the longitudinal mode was observed o…
Abstract Polyamideimides were prepared either directly from N‐(p ‐carboxyphenyl)trimellitimide and p , p ′‐di(aminocyclohexy)methane (PACM‐20) by low temperature (<5°C) polycondensation in presence of thionyl chloride or by reacting the diacid chloride of N ‐( p ‐carboxyphenyl)trimellitimide and PACM‐20 at 30–70°C.…
Abstract Pd–TPPS3 was found to be an effective photosensitizer for the photoreduction of viologen dyes, such as methyl, ethyl, propyl, butyl, and heptyl viologens. The order of the reduction rate was as follows: Ethyl&gt;Butyl&gt;Methyl&gt;Propyl&gt;Heptyl. The respective complex formation was observed…