Cemento de escorias
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Contribución al estudio de los problemas de analogías creados por los molinos de bolas
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Aplicación de las resinas epoxi para revestimientos y juntas de hormigón, en los Estados Unidos
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La Influencia del polvo de los gases de escape en las fábricas de cemento sobre el estado de salud del ganado vacuno – Bonn (Alemania)
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Eficacia de una puzolana de origen volcánico en la resistencia del hormigón
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Electronic Conduction in Polymers. III. Electronic Properties of Polypyrrole
The electron spin resonance absorption and electrical resistivity have been measured under rigorous conditions for a series of polypyrroles prepared over the temperature range 120-500°. When plotted as a function of pyrolysis temperature the resistivity shows a maximum in the region 200-300°. Although the resistivity…
Electronic Conduction in Polymers. I. The Chemical Structure of Polypyrrole
The pyrolysis of tetraiodopyrrole in an inert atmosphere at temperatures from 120-700° yields black, infusible, amorphous polymers insoluble in solvents. Depending on the pyrolysis temperature, iodine may be present in the polymers as iodine of substitution and as chemisorbed molecular iodine, which is very tenaciousl…
Obsidian-H2O viscosities at 1000 and 2000 bars in the temperature range 700° to 900°C
Viscosities of synthetically hydrated obsidians have been measured by the falling-sphere technique at two values of the H2O content. At 4.3 per cent H2O, by weight, the common logarithm of the viscosity in poises ranges from 6.51 at 800°C to 5.88 at 900°C, and at 6.2 per cent H2O from 6.54 at 700°C to 5.25 at 850°C. T…
Optical Properties of Aluminum
The frequency-dependent complex dielectric constant $\ensuremath{\epsilon}(\ensuremath{\omega})={\ensuremath{\epsilon}}_{1}+i{\ensuremath{\epsilon}}_{2}$ and associated functions are derived in the range 0 to 22 eV by application of the Kramers-Kronig relations to existing reflectance data for clean Al surfaces. The r…
Mass-Spectrometric Investigation of the Oxidation of Molybdenum and Tungsten
The oxidation of molybdenum and tungsten was investigated mass spectrometrically at temperatures between 1500° and 2600°K and oxygen pressures between 10—4 and 10—2 Torr. The principal products of oxidation were found to be the gaseous dioxide and trioxide, MO2(g) and MO3(g) (M=Mo or W). The trioxide is the more impor…
Infrared Spectra and the Structures and Thermodynamics of Gaseous LiO, Li2O, and Li2O2
The vapor above heated lithium oxide (Li2O) has been investigated mass spectrometrically and by infrared matrix-isolation spectroscopy. The vapor composition and Knudsen effusion rates were measured as functions of temperature, and the matrix spectra of the principal lithium oxide species—Li2O, LiO, Li2O2—identified a…
Direct Evidence for Energy Transfer Between Rare Earth Ions in Terbium-Europium Tungstates
Received 30 September 1963DOI:https://doi.org/10.1103/PhysRevLett.11.458©1963 American Physical Society
High-Frequency Behavior of Hydrogen-Bonded Ferroelectrics: Triglycine Sulphate and KD2PO4
The small signal dielectric coefficient of triglycine sulfate (TGS) and K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$ has been determined as a function of frequency, temperature, and dc bias field in both the ferro- and paraelectric regions. The data for TGS are found to agree with a heuristic model involving a Gaussian dist…
Electronic Structure of Copper Impurities in ZnO
We have measured the near infrared absorption, Zeeman effect, and electron spin resonance of ${\mathrm{Cu}}^{2+}$ ions introduced as a substitutional impurity into single-crystal ZnO. From the $g$ values of the lowest ${\ensuremath{\Gamma}}_{6}$ component of the ${T}_{2}$ state (the ground state), ${g}_{\mathrm{II}}=0…
Enhancement of Fluorescence Yield of Rare-Earth Ions by Heavy Water
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation John L. Kropp, Maurice W. Windsor; Enhancement of Fluorescence Yield of Rare‐Earth Ions by Heavy…
Infrared Lattice Vibrations and Dielectric Dispersion in Corundum
Room-temperature reflectivity measurements in the wavelength range 1 to 140 \ensuremath{\mu} have been made on corundum and ruby. Classical oscillator analysis of the data shows that the optical lattice modes with dipole moment vibrating perpendicular to the $C$ axis occur at 15.7, 17.6, 22.6, 26.0 \ensuremath{\mu}. T…
High Pressure Phases of Some Compounds of Groups II-VI
The high pressure phases of the mercury and cadmium sulfides. selenides, and tellutrides have been determined by means of x-raiy diffraction patterns obtained while the materials are under presssure.
The Bakerian Lecture, 1963. Fracture
Abstract Under a large tensile stress the atoms in a solid may slide past one another or they may pull apart. The great contrast between ductile solids such as gold and brittle ones such as diamond has led to a widely held belief that yielding and fracture are independent processes, each occurring at its own character…
Crystal field effects and the co-operative state I. A primitive theory
Abstract A primitive theory is developed for treating magnetic substances where exchange interaction is com parable with crystal field effects. The properties primarily considered are the Curie temperature and the saturation magnetization at 0°K ; the possibility of anisotropic exchange effects is considered briefly.…