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。
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…
Abstract The iron oxides and clay mineralogy were characterized for several soils of Venezuela which contain plinthite and pseudo‐plinthite. Molar ratios of SiO 2 /Al 2 O 3 (Ki ratios) of the plinthite and pseudo‐plinthite zones range from below 2 to above 4 suggesting a wide range in mineral composition. Cation excha…
Reports the results of magnetic measurements performed on Gd(Fe y Al 1-y ) 3 and (Gd x Y 1-x )Fe 3 compounds over the temperature range 4.2-1300K. For x and y>or=0.2 the compounds are ferrimagnetically ordered. In this case, the reciprocal susceptibility chi -1 follows a Neel-type hyperbolic law. The YFe 3 compound is…
Recent data have been used to develop the strongly discommensurate model for NbSe 3 that was introduced in 1978/9. The tightly defined q vectors found for both CDWS are accounted for by a plausible internal structure for the discommensurations. These, because of their relatively weak impurity pinning, seem to form a v…
The configurational entropy as well as other related thermodynamic properties of a (poly)disperse glass-forming polymer melt have been calculated exactly in terms of a lattice-hole model and within the framework of the mean field approximation (MFA). One of the main results of the calculation, in which the average “st…
A three dimensional model is developed to describe the linear-sublinear behaviour of the thermoluminescence (TL) dose response curve induced by heavy charged particles specifically 'low energy' ( approximately 1 MeV u -1 ) alpha particles. Supralinearity induced by alpha particles is shown to be suppressed or non-exis…
The ground-state energies in magnetic fields are calculated for the electron crystals with the bcc and fcc structures at low electronic densities. The energies are obtained as sums of the static energy and the zero-point vibration energy in the harmonic approximation. The zero-point energy of the fcc becomes lower tha…
The rotational viscosity ${\ensuremath{\gamma}}_{1}(T)$ of a nematic is of dominant importance for wide operating temperature display applications. In this paper we show that ${\ensuremath{\gamma}}_{1}(T)$ is, except for a small prefactor variation, a universal function of $T\ensuremath{-}{T}_{g}$ where ${T}_{g}$ is t…
Deuteron NQR spectra of several model systems involving alcoholic of phenolic-OD groups are discussed. The spectra of alpha hydroquinone and its two isomers resorcinol and catechol show complex structure due to the presence of inequivalent O–D⋅⋅⋅O hydrogen bonds. In the case of hydroquinone, this structure collapses t…
The microstructure of two commercial 2:17 precipitation hardened rare-earth magnets has been examined and compared with the magnetic properties. Transmission electron microscope studies on Sm(Co,Fe,Cu,Hf)7.25, Hicorex 99C show a fine cellular microstructure with 2:17 rhombohedral cells surrounded by coherent 1:5 hexag…