Materials Literature
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The molecular dynamics (MD) computer simulation technique was used to simulate the vitreous silica (v-SiO2) surface. A modified Born–Mayer–Huggins potential function was used in the simulation; periodic boundary conditions in two dimensions (x and y) only were used to create a thin slab with free surfaces in the z dir…
Measured valence-band photoelectron spectra for the transition-metal glasses ${A}_{x}{\mathrm{Zr}}_{100\ensuremath{-}x}$ ($A=\mathrm{F}\mathrm{e},\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{o},\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{i},\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{u},\phantom{\rule{0ex}{0ex}}\mathrm{R}…
Electron-spin resonance (ESR) is used to investigate the formation and thermal anneal characteristics of ${E}_{1}^{\ensuremath{'}}$ centers in high-quality synthetic quartz. These centers are produced by ionizing radiation near room temperature followed by annealing to 300\ifmmode^\circ\else\textdegree\fi{}C. The resu…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Toshiaki Kita, Tatsuo Harada, N. Nakano, and H. Kuroda, "Mechanically ruled aberration-corrected concave gratings for a flat-field grazing-incidence sp…
X-ray photoelectron (XPS) spectra of the valence bands of approximately 60 Ni and Pd alloys and intermetallic compounds with 20 different elements are presented. In alloys with electropositive elements the Ni and Pd $d$-band centroids move to larger binding energies and the density of $d$ states at the Fermi level (${…
Computer-model calculations have been carried out for vacancies, divacancies, and interstitials in tungsten using an interatomic potential developed by Johnson and White. Full relaxation of the 531 atoms closest to the defect is carried out by the model, and surrounding atoms are constrained to displace elastically. W…
The thermal diffuse background between diffracted electron beams has been analyzed with high-energy resolution. The main contribution arises from a surface phonon single-scattering event. The surface phonon dispersion is measured along the $\overline{\ensuremath{\Gamma}}\ensuremath{-}\overline{X}$ direction, and compa…
The prospects for protein engineering, including the roles of x-ray crystallography, chemical synthesis of DNA, and computer modelling of protein structure and folding, are discussed. It is now possible to attempt to modify many different properties of proteins by combining information on crystal structure and protein…
The viscosity of four iron‐containing silicates with alumina has been measured under oxidizing and reducing conditions over the temperature range 450° to 700°C. Initially, the compositions contain approximately 2, 5, 10, and 20 mol.% of trivalent metal oxide. The viscosities of compositions with approximately equimola…
We report results of vertical impacts of aluminum projectiles into quartz sand. The impacts were performed at velocities of 35 to 830 m/sec with a single stage powder gun. Morphology of craters formed in loose sands is generally conical, whereas morphology of craters formed in self‐compacted sands varies from a flat‐f…
The recently proposed model Hamiltonian for a linearly conjugated diatomic polymer is studied in the continuum limit in which there emerges a field-theoretic Dirac Hamiltonian, exhibiting charge fractionization into irrational numbers, just as in the discrete model.
Abstract A Geometrical model is presented which rationalizes the viscosity and self-diffusion coefficients and their anisotrcpies in nematic liquid crystals. The model is an extension of Eyring’s theory of the liquid state to the anisotropic fluid, based on the geometry of the constituent molecule. A novel concept, ef…
Abstract The zeta potential of cellulose suspensions with resin and with butadiene‐styrene latex or acrylonitrile latex is independent of the quantity of the latex used. The addition of aluminium sulphate as an electrolyte leads to recharging of the particles. Mixed suspensions of 50% cellulose and 50% asbestos fibres…
Abstract The iron complex of tetrabenzporphine was prepared and characterized. Cyclic voltammetry, and UV absorption, EPR, and MCD spectroscopy have revealed that its monochloride and bisimidazole complexes are trivalent iron high- and low-spin complexes, respectively.
The short-circuit peak current and the electromagnetic short-circuit peak force appear at about 10 ms after the short-circuit inception. However, the maximum value of dynamic stress due to the electromagnetic forces may occur much later and depends on the fundamental frequency of the structure. A decrease in dynamic s…
Unmodified cotton and cotton fabrics finished with eight add-ons of THPOH-NH3 were subjected to thermogravimetric analysis in a vacuum and in nitrogen. Nitrogen had no effect on the thermogravimetric data. THPOH-NH3up to 6% add-on lowered temperatures of maximum pyrolysis rates and decreased the weight loss per unit w…
A two-stage, predominantly brittle wear-chip mechanism is developed which may describe fine polishing with diamond grit having sizes in the range 2–10 μm. (Coarser grits do not give a fine polished surface.) In the first stage, the size of the wear chips is determined by cracking in the elastic stress field behind the…
In order to remove the existing confusion in analyzing Raman spectra in terms of a system of coupled damped harmonic oscillators, we discuss the phenomenological theory of coupled modes. It is suggested that in the coupled modes analysis of Raman spectra, the poles of the decoupled susceptibility are the most importan…
Abstract Amorphous alloys Fe 40 Ni 40 B 20 and Fe 39 Ni 39 B 10 Si 12 exhibit a typical active/passive transition when anodically polarized in borate and/or phthalate buffer solutions, at pH = 4.0; 5.3;6.3 and 8.4. There is no large effect of Si on the anodic behaviour of the alloys in these media. Both alloys undergo…
<div class="htmlview paragraph">Dual phase steel offers potential for wheel weight reduction, but has not been completely succeeded, in part, because of a localized necking or a fracture during rim fabrication. This failure should be related to a softening in the weld heat affected zone (HAZ).</div> <di…