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。
We have explored the hard magnetic properties of melt-spun Nd-Fe-B alloys. A maximum energy product of 14.1 MG Oe has been observed, the highest value ever reported for a light rare earth-iron material. X-ray analyses indicate that the alloys exhibiting optimum characteristics are comprised of roughly spherical crysta…
Band structure of the ferrimagnetic Fe 3 O 4 was calculated in the high temperature cubic phase by means of self-consistent APW method. Though the obtained band structure corresponds closely with the ionic Néel model, it was shown that the itinerant electron model is more adequate than the localized electron model. Th…
Prominent examples of inhibitors recommended to protect metallic materials, especially ferrous metals and alloys, from corrosion in hydrochloric, sulphuric, nitric, hydrofluoric, phosphoric, sulphamic, citric, acetic, hydroxyacetic or formic acid or ammonium bifluoride, during acid pickling, scale removal, acid cleani…
Random two-dimensional patterns crop up in a wide variety of scientific contexts. What do they have in common? How can they be classified or analysed? These questions are underlined, and partly answered, by a survey of such patterns, paying particular attention to soap cell networks, metallurgical grain structures and…
"The Sulphate-Reducing Bacteria." British Corrosion Journal, 19(2), p. 55
Part 1 Preparation: definitions preparation of amorphous materials. Part 2 the glass transition theories for the glass transition factors that determine the glass-transition temperature glass-forming systems and ease of glass formation. Part 3 Structure: microscopic structure - experimental techniques, short-range ord…
An Arabian Gulf well with a history of SrSO4 scale making 2,300 bopd and 1,200 bwpd from a zone 150 ft thick was squeeze-treated with 8 drums of scale inhibitor. Fifteen months later, gage rings showed no scale formation down hole, and inhibitor concentration in the produced water continued at an acceptable level. A w…
A band structure calculation using well localised orbitals obtained in a self-consistent manner has been performed on NiO. The localisation of the orbitals allows the treatment of both the valence and the lowest conduction bands by the tight-binding method. The details of the crystal potential are presented. The charg…
Considers the effect of long-range Coulomb interactions on the properties of a model quasi-one-dimensional conductor. Use of the bosonisation method allows the author to obtain an essentially exact solution of the problem. Most spectacularly, for g 1 >0(g 1 is the intrachain backward scattering constant) there is a me…
The Hall effect and the magnetoresistance of ${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$ have been measured at temperatures from 0.08 to 10 K and in magnetic fields to 22 T. The low-temperature data suggest a series of transitions induced by an orbital effect from the magnetic field which progressively reduce the car…
Holes are produced inside a thin layer of magnetic fluid with use of monodisperse polystyrene spheres with diameters in the micrometer range. With an external magnetic field an apparent magnetic dipole will be associated with each hole as a result of the displaced fluid. The apparent dipolar interactions between the s…
The observation of macroscopic collective behavior in a nematic liquid crystal doped with magnetic grains is reported. This behavior is manifested as a uniform molecular orientational distortion of the entire matrix upon the application of external magnetic fields as low as 1 G. The dependence of the distortion on fie…
Absorption, luminescence characteristics, and stimulated emission parameters of Nd3+ ions in the wide temperature region of a full concentration series of (La1−xNdx)3Ga5SiO14 single crystals are studied. Luminescence intensity characteristics are analyzed and transition cross-section at the laser wavelengths of two 4F…
A large decrease in the radiation-induced conductivity of polyethylene terephthalate was produced upon doping films with an electron acceptor molecule. Transient x-ray photoconductivity data verify that this impurity acts as a deep trap. Charge transfer occurs in the doped dielectric which may be associated with this…
The transmittances and reflectances of cultured crystalline quartz, Suprasil, Suprasil W, and Infrasil were compared over the wavelength region from 2 to 1000 μm. The high-water content of Suprasil and the low-water content of cultured crystalline quartz, Suprasil W, and Infrasil were determined by their transmittance…
Reflectance and transmittance of electromagnetic radiation from an exponentially graded-index multilayer dielectric structure are investigated theoretically. It is shown that such a structure maximizes the optical transmission in the case in which this transmission is approximated by summing intensities. Transmittance…
The angular dependence of the high-field magnetoresistance anomaly in graphite is reported. The observed angular dependence is consistent with the functional form for the phase boundary of a charge-density-wave transition suggested by Yoshioka and Fukuyama. Sharp periodic features in the resistivity occurring after th…
The surface electronic structure of single-crystal ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been studied by using ultraviolet and x-ray photoelectron spectroscopy. Both nearly-perfect surfaces and surfaces containing point defects have been prepared, and the influence of ${\mathrm{O}}_{2}$ and ${\mathrm{H}}_{2}$O on b…
Calculations of 4f → 4f electric dipole intensity parameters are reported for six different lanthanide (III) systems whose solid-state structures and optical spectra have been well characterized. In each case, the ligands are considered to have isotropic electronic charge distributions, and the 4f → 4f intensity param…
The Raman spectra of thin film, and powdered crystalline forms of CuTCNQ have been studied and analyzed in connection with their electronic spectra and vibrational normal coordinate analysis and molecular orbital results. Nonresonance and resonance Raman conditions have been obtained by using different sample forms an…