Description of the installation set up by «Áridos, S. A.», to obtain sand, rounded and crushed silicon aggregates
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Materials Literature
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Current state of automation
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Symposium on the effect of aggressive fluids on concrete
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Heterogeneities in the chemical composition of concrete
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Rapid and full chemical analysis of Portland cement and similar products
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Alpha- quartz quantitative X ray diffraction analysis
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Bibliography
Temperature Dependence of the Raman Spectrum of SrTiO3 and KTaO3
The temperature dependence of the second-order Raman spectrum of SrTiO3 and KTaO3 has been observed over the temperature range 4°—473°K using the mercury 4358-Å exciting line. From group-theoretical arguments for cubic perovskite lattices the spectra have been interpreted in terms of phonon pairs at critical points in…
Electron Spin Resonance of Fe3+ in SrTiO3 with Special Reference to the 110°K Phase Transition
The electron spin resonance of F 3+ in single crystals of SrTiO 3 has been studied in the low temperature phase below 110°K. The resonance lines exhibited small splitting in addition to the usual tetragonal splitting. The orientation dependence of the splitting was measured at 77°K and at 4.2°K. The whole spectrum is…
Poly(aryl ethers) by nucleophilic aromatic substitution. I. Synthesis and properties
Abstract A series of new aromatic polyethers have been prepared by solution condensation polymerization. The synthesis involves the condensation of a dialkali metal salt of a dihydric phenol with an “activated” or negatively substituted aromatic dihalide in an anhydrous dipolar aprotic solvent at elevated temperatures…
The crystal dynamics of lead sulphide
Abstract The frequencies of normal modes propagating in the high symmetry directions, [001], [110] and [111], of lead sulphide have been measured by inelastic neutron scattering techniques. A marked decrease in the value of the longitudinal optic mode frequency has been observed at small wavevectors. A similar effect…
Elastase: Production by Ringworm Fungi
In the morphogenesis of embryonic feather germs the formation of dermal cell groupings is associated with the development of a highly regular pattern of birefringence in the dermis. This birefringence is due to a lattice-like system of collagenous tracts along which dermal cells become progressively aligned and groupe…
Pair Production by Photons on Electrons
The cross section for production of electron pairs by unpolarized photons in the field of an electron is calculated. The total cross section is obtained by numerical integration. The contributions to the total cross section from different diagrams (exchange and $\ensuremath{\gamma}\ensuremath{-}e$ terms) are calculate…
Collagen Proline Hydroxylase in Wound Healing, Granuloma Formation, Scurvy, and Growth
Compared to homologous tissues from adult animals, rapidly growing embryonic and fetal tissues contain large amounts of collagen proline hydroxylase. Lung and skin from scorbutic guinea pigs contain one-third as much enzyme as normal tissues do. A rapid increase in proline hydroxylase occurs on the 2nd day of formatio…
APosterioriTheory of Covalent Bonding
The self-consistent charge distribution in covalently bonded crystals and molecules is divided into two components, an atomic and a bonding part. Both can be calculated in elemental crystals from macroscopic dielectric properties. The theory is easily generalized to treat heteropolar and anisotropic effects, lattice v…
Transformation of Gibbsite to Chlorite in Ocean Bottom Sediments
Numerous grains of gibbsite surrounded by zones of chlorite were found in six samples of sediment taken from Waimea Bay off the coast of Kauai, Hawaii. The chlorite has formed from the gibbsite, and growth bands in the chlorite either are parallel to chlorite-gibbsite interfaces or are concentric around small remnants…
PHASE SEPARATION IN THE Cu–Ni–Fe SYSTEM; MÖSSBAUER EFFECT EVIDENCE AGAINST DECOMPOSITION BY THE ``SPINODAL MECHANISM''
Mössbauer spectroscopy has been used to investigate the early stages of phase separation in the Cu–Ni.7Fe.3 pseudobinary system. Our results indicate that new phase of composition close to the equilibrium composition is formed early in the decomposition, and grows in amount during transformation. The type of compositi…
Seebeck Coefficient of Semiconducting Oxide Glasses
The Seebeck coefficient, α, of semiconducting glasses based on vanadium pentoxide can be calculated from a knowledge of the concentration ratio of the high and low valence ions. The concentration of vanadium ions in the glass and long-range order apparently have no effect on α. Semiconducting glasses based on iron oxi…
Optical Properties of Germanium in the Far Ultraviolet
Reflectance measurements for Ge films evaporated in situ are reported for 16 wavelengths between 490 and 1610 \AA{}, corresponding to photon energies of 25.2 and 7.7 eV. Measurements were taken after 3-min exposures to ambient pressures of 5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}7}$ Torr. Reflectance v…
Polyhedral Clathrate Hydrates. XIV. The Structure of (CH3)3CNH2·9¾H2O
The crystal structure of 16(CH3)3CNH2·156H2O has been determined from three-dimensional x-ray-diffraction data obtained at −30°C. The crystals are cubic, space group I4̄3d, with cell dimensions a=18.81±0.02 Å. The host framework of hydrogen-bonded water molecules consists of face-sharing heptakaidecahedra which have t…