Tribology in Metalworking: Friction, Lubrication and Wear
Tribology in metalworking: friction, lubrication, and wear , Tribology in metalworking: friction, lubrication, and wear , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Materials Literature
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The Measurement and Analysis of Heterogeneous Emissions by Multifrequency Phase and Modulation Fluorometry
During the last few decades fluorescence spectroscopy has developed into an important and widely used technique in the physical, chemical, and biological sciences. The increasing sophistication of theory and methodology has permitted us to apply fluorescence techniques profitably to a variety of complex problems. A fu…
Effects of As+ ion implantation on the Raman spectra of GaAs: ‘‘Spatial correlation’’ interpretation
We have studied Raman scattering from 〈100〉 GaAs samples implanted with 270-keV As+ ions with various fluences up to 3.2×1014 cm−2. In addition to phonon density of states effects, we observe a softening and asymmetric broadening of the allowed LO phonon while the small symmetry forbidden TO phonon remains almost unch…
The Colloidal “Activity” of Clays
In any particular clay stratum the ratio of the plasticity index to the clay fraction content is approximately constant, and may be defined as the “activity” of the clay. Values of activity are given for many clays and also for the more common minerals. It is shown that activity is related to the mineralogy and geolog…
Pharmacokinetics of GdDTPA/dimeglumine after intravenous injection into healthy volunteers.
Pharmacokinetic studies of GdDTPA/dimeglumine in man show a rapid renal clearance and no evidence for dissociation or retention of the complex in the body. These features, in conjunction with its strong proton relaxation enhancement and its low toxicity suggest that this complex may be an excellent contrast medium for…
High-energy product Nd-Fe-B permanent magnets
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 in the High Temperature Phase of Fe3O4
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…
Application of Inhibitors for Acid Media: Report prepared for the European Federation of Corrosion Working Party on Inhibitors
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…
Soap, cells and statistics—random patterns in two dimensions
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
"The Sulphate-Reducing Bacteria." British Corrosion Journal, 19(2), p. 55
Physics of amorphous materials
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…
Precipitation squeeze can control scale in high-volume wells
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…
Band structure and optical properties of NiO. I. Band structure calculations
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…
Long-range Coulomb interactions in quasi-one-dimensional conductors
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…
Tetramethyltetraselenafulvalenium Perchlorate,(TMTSF)2ClO4, in High Magnetic Fields
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…
One- and Two-Dimensional Crystallization of Magnetic Holes
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…
Observation of Macroscopic Collective Behavior and New Texture in Magnetically Doped Liquid Crystals
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…
Investigation of trigonal (La1−xNdx)3Ga5SiO14 crystals. II. Spectral laser and electromechanical properties
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…
Effect of chemical doping on the radiation-induced conductivity of polyethylene terephthalate
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…
Transmittance and reflectance of crystalline quartz and high- and low-water content fused silica from 2 μm to 1 mm
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…