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。
Electrical conductivity (σ) and thermopower measurements have been carried out on some Mg 1+x Ge x Fe 2−2x O 4 (0 < x < 0.4) ferrite samples over a temperature range 300–700 K. Using the experimental values of Seebeck coefficient at various temperatures, the values of charge carrier concentration have been deter…
The relaxation time of the magnetization of a big magnetic molecule is evaluated. Isotropic exchange is assumed to be dominant, resulting in a fixed spin modulus s (equal to 20 in the case of interest). A perturbation of the form AS z 2 results from spin-orbit coupling and produces an energy barrier As 2 which separat…
\nThe growth of micron-size carbon fibres from thermal decomposition of hydrocarbons catalyzed by a metal has been widely studied. Coil-shaped fibres often grow among straight or twisted filaments. Their internal structure has not been studied in detail as yet. In the present work, the thermal cracking of acetylene on…
This book is a comprehensive design text for permanent magnets and their application. Permanent magnets are very important industrially, and are widely used in a variety of applications, including industrial drives, consumer products, computers and cars. In the early 1970s a new class of magnet - the rare earths - was…
Human tryptophan hydroxylase has been expressed as a soluble and active form in Escherichia coli by fusion with an affinity tag, maltose-binding protein. The fusion protein has been purified to near homogeneity by affinity chromatography on crosslinked amylose resin. The purified fusion protein has a specific activity…
Abstract Rubber toughening of thermoplastic polymers always decreases the tensile and flexural properties. In this article, an attempt is made to improve the tensile and flexural properties of a rubber‐toughened polymer system viz., polypropylene (PP)/styrene‐ethylene‐butylene‐styrene tri‐block copolymer (SEBS) binary…
Multivariable statistically designed experiments have been used to optimize diamond growth in a H2-CH4-O2 magnetoactive plasma at 1–3 Torr total pressure. The input process parameters included total pressure, microwave power, substrate temperature, methane and oxygen fractions, and applied substrate bias, and the expe…
The resonant photoemission of iron films on copper has been examined near the 3p to 3d excitation threshold using synchrotron radiation from the MAX storage ring. Resonant profiles are presented in the photon energy range 46-150 eV. Special attention has been paid to the position of the destructive minimum before the…
The electronic structure of orthorhombic potassium niobate has been studied with a particular focus on empty electronic states. Occupied electronic states were analysed by X-ray photoelectron spectroscopy. Empty electronic states were probed by X-ray absorption spectroscopy at the oxygen K edge (531 eV), the niobium L…
We have analysed by use of synchrotron radiation induced angle resolved photoemission spectroscopy (PES), Auger electron spectroscopy (AES) and low-energy electron diffraction (LEED) the growth of ultrathin Co layers deposited at room temperature on Pt(111) surfaces. The LEED patterns indicate an incoherent epitaxy an…
The extremely large zero-field splitting of Fe 3+ ions at the tetragonal FeF 5 O site in Fe 3+ :KMgF 3 crystals has been interpreted on the basis of a second- to sixth-order perturbation approach, in which the spin-orbit coupling is regarded as the perturbation to the crystal-field and electrostatic interactions. The…
Pr3+-doped As-S chalcogenide fiber is fabricated using a double-crucible method. The thermal and spectroscopic properties of Pr3+-doped As-S glasses are clarified. Pr3+-doped As-S fiber is shown to be a promising candidate that will lead to efficient Pr3+-doped fiber amplifiers.
GaInO3 is recently identified transparent conducting material which is structurally and chemically distinct from indium tin oxide [R. J. Cava, J. M. Phillips, J. Kwo, G. A. Thomas, R. B. van Dover, S. A. Carter, J. J. Krajewski, W. F. Peck, Jr., J. H. Marshall, and D. H. Rapkine, Appl. Phys. Lett. 64, 2071 (1994)]. We…
We have studied the influence of nitrogen impurities in CH4/H2 gas mixtures on the structure and morphology of polycrystalline diamond films prepared by microwave plasma assisted chemical vapor deposition. The nitrogen concentration in the process gas was varied between 1 and 1000 ppm. Optical emission spectroscopy wa…
Small-angle neutron scattering experiments have revealed an epitaxial relationship between the hexagonal cylinder phase, and a bicontinuous cubic phase with $\mathrm{Ia}\overline{3}d$ space group symmetry, in a poly(styrene)-poly(2-vinylpyridine) diblock copolymer mixture. Proximity to the order-disorder transition an…
Carbon nitride films deposited by three different methods have been analyzed using in situ Auger electron spectroscopy and ex situ x-ray photoelectron spectroscopy (XPS) and Rutherford backscattering spectrometry. The XPS data for all 27 samples indicate that these films have a similar composition consisting of two ph…
Based on the phase shifts due to the total internal reflection and the grating diffraction, a new type of quarter-wave plate using substrate-mode holograms is presented. A sample of this device was fabricated to demonstrate its function.
Abstract The functional integral formalism, combined with a Monte‐Carlo calculation for the magnetization of rare‐earth spins, is used to describe the magnetic properties of RT 2 compounds. The results of the numerical solution of the coupled self‐consistent equations, involving both itinerant d electrons and localize…
Four coils have been built and installed in the JET vacuum vessel to produce divertor plasmas. The coils are copper with glass epoxy insulation and are enclosed in vacuum tight Inconel cases. At the coil contractor's factory, the coil parts were manufactured and process techniques qualified. In the JET vacuum vessel t…
Superdislocations on the 〈110〉{111} system in single-crystal Al6 7Cr8Ti25 have been studied using weak-beam transmission electron microscopy. It was found that the superdislocations are dissociated into superlattice intrinsic stacking-fault-coupled ⅓〈112〉 superpartials at 77 K but into antiphase-boundary (APB)-coupled…