Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract In poly(butylene terephthalate) based compositions, thermal degradation of the polymer matrix during processing has to be minimized to achieve quality products. Experience has shown a temperature‐residence time relationship, indicating that for mixing systems with high product temperatures, the residence time…
The uniaxial magnetic anisotropy induced by magnetic annealing has been studied for Co, Co–Ni alloys with the γ\rightleftarrows ε and for Co–Fe, Fe–Ni alloys with the γ\rightleftarrowsα martensitic phase transition. An anomalously large uniaxial magnetic anisotropy was found in both pure Co and Co–Ni alloys, while a m…
A Mossbauer effect study of 57 Co- and 57 Fe-doped Heusler alloys Co 2 MnX (X=Si, Ge, Sn, Ga), has shown that Fe preferentially replaces Mn in the crystal lattice. Variations in the isomer shifts follow trends observed in the system FeX. There is a substantial difference in the Fe magnetic hyperfine fields at the Co a…
Dispersion characterisitcs of magnetoelastic surface waves in highly magnetostrictive cubic crystals are calculated for different bias fields applied along the direction of propagation. Effects of anisotropy are taken into account. The surface waves are found to be leaky or nonleaky depending on the direction of propa…
The Commensurate-Incommensurate (C-IC) phase transition at finite temperature is considered in mean-field approximation taking account of higher harmonics. The phase diagram is given in the (µ, T)-plane, where µ represents a measure of the deviation from 1/3 filledness. It is shown that at proper values of µ successiv…
Abstract A weakly nonlocal version of the nonlocal continuum theory is used to calculate the interaction energy between a pair of identical defects in a face‐centred cubic lattice when the defect spacing is large. The lattice is assumed to be the same that was considered by Hardy and Bullough, namely, an idealized har…
A dielectric-relaxation model has been proposed by Simmons and Taylor to explain anomalous currents in silicon nitride thin films. In this study, similar currents are observed in certain cadmium borosilicate glasses. The presence of a color center and of composition indepedence of the activation energy for electronic…
The magnetic structure of Fe 5 SiB 2 has been investigated using Mössbauer spectroscopy. In the temperature region 140 K-784 K the compound is found to be a simple ferromagnet with the spins parallel to the c -axis. At lower temperatures the spins are located in or close to the ab -plane and there are indications that…
Abstract Die Rutilform des GeO 2 wird über eine endotherme Reaktion mit Cl 2 als Transportmittel, bei Abscheidungstemperaturen unterhalb 900°C, in großen säulenförmigen Kristallen erhalten. Die Farbe der Kristalle ist je nach Versuchsbedingungen gelb bis bernsteinfarben. Der Vergleich der berechneten und der experimen…
High-temperature spin dynamics in one-dimensional, spin 1/2, Heisenberg systems CuCl 2 ·2NC 5 H 5 and Cu(C 6 H 5 COO) 2 ·3H 2 O is studied by the measurements of proton spin-lattice relaxation rate, T -1 1 . The field dependence of T -1 1 can be fitted by an expression T -1 1 = P H -1/2 + Q , which gives direct eviden…
Lithium, sodium and potassium isobutyrates, isovalerates and isocaproates were submitted to a differential scanning calorimetric investigation in the temperature range between 320 K and the isotropic melt region. The collected phase transition temperatures and heat effects are compared to those of the corresponding li…
<div class="htmlview paragraph">The fuel economy was sharply improved from our 1976 model rotary engine cars mainly through modifications to the engine and improvements in the reactivity of the thermal reactor system.</div> <div class="htmlview paragraph">The progress of our development on these item…
Light and electron microscopy revealed that there are both rods and cones in the retina of the eel Anguilla rostrata. The rods predominate with a rod to cone ratio of 150:1. The spectral sensitivity of the dark-adapted eyecup ERG had a peak at about 520 nm and was well fit by a vitamin A2 nomogram pigment with a lambd…
Die Natur von Sb2O5, die bis in die heutige Zeit umstritten war, konnte jetzt durch Kristallstrukturanalyse geklärt werden. Koordinations- und Verknüpfungsprinzipien stimmen mit denen von B-Nb2O5 überein. Dies ist die erste derartige Beziehung zwischen dem Pentoxid eines Haupt- und eines Neben-gruppenelements.
The authors have measured the lattice thermal conductivity of very pure aluminium in the temperature range between 1.5K and 15K by suppressing the electronic thermal conductivity with a magnetic field in the Corbino geometry. Taking into account a linear term in the magnetoresistance in the extrapolation procedure, it…
Abstract Descriptions on the absolute configuration at C-5 of cacalol have been confused. Ozonolysis of cacalol afforded (S)-(+)-2-methylhexanedioic acid. The asymmetric center at C-5 of cacalol, cacalone, and of sesquiterpenes related to these compounds was therefore established to be (S)-configuration.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of electronegative substituted tetrathiafulvalene derivativesShigeo Yoneda, Tokuzo Kawase, Mikio Inaba, and Zenichi YoshidaCite this: J. Org. Chem. 1978, 43, 4, 595–598Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Published…
A differential radial distribution function (DRDF) of molten natural rubber (NR) was derived from its wide-angle x-ray scattering (WAXS) data. Three peaks with Bragg spacings 4.85, 2.31, and 1.23 Å corresponding, respectively, to interchain, C1-C3 and C1 -C2 distances are present in the corrected WAXS curve. The deriv…
Magnetization curves of single crystals were measured from 4.2 K up to T c (≃30 K). The magnetization is approximately expressed by M = M 0 +χ w H in higher fields. χ w which reflects the antiferromagnetic character, was found to be almost isotropic and temperature-independent (≃8×10 -6 emu/g). M 0 is anisotropic; 0.9…
A number of properties, chemical composition, density, isothermal transport coefficients, paramagnetic susceptibility, and specific heat, of an anthracene char are investigated during the carbonization process. A simple physical picture for the carbonization process which assumes the existence of density fluctuations…