O–H–O and O–D–O Potential Energy Curves for Chromous Acid
On the basis of infrared data it is concluded that the O–H–O bond in HCrO2 (chromous acid) is symmetric, whereas the O–D–O bond in DCrO2 is asymmetric.
Materials Literature
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Kinetic Theory of Dislocation Climb. I. General Models for Edge and Screw Dislocations
General kinetic models are established for the climb of edge and screw dislocations. The climb of a straight unconstrained edge dislocation is considered in terms of the diffusion of nonequilibrium point defects to (or from) the line and their absorption (emission) and destruction (creation) at the line. The climb is…
Allophane in Some Ando Soils
Allophane has been known to occur widely in volcanic ash soils in Japan and New Zealand. However, exact knowledge of its nature has not been well established, mainly because of extreme difficulty to separate it in pure state and of its x-amorphous nature. In the course of the studies on soil allophane, it was noticed…
Magnetoelectric Effects in Antiferromagnetics
Spin-ordered materials may exhibit a magnetic polarization which is proportional to an applied electric field and an electric polarization which is proportional to an applied magnetic field. In this paper a comprehensive discussion is given of the present knowledge of these magnetoelectric (ME) effects. The specific t…
Deformation twinning in alloys at low temperatures
Observations on low temperature mechanical twinning in Cu and Cu-Zn alloys are reported. The absence of indications of twinning on the stress-strain curves of crystals of 70:30 α-brass is discussed in relation to recent preliminary electron microscopy observations. The twinning data are consistent with the existence o…
The Effect of Gamma Radiation on Collagen
Investigations on the effect of ionizing radiations on proteins have mainly been concerned with soluble proteins. Irradiation of these, either in solution or in the dry state, leads to aggregation and decreased solubility, and at the same time to fragmentation of the protein molecule (1-4). Little detailed information…
Thermal conductivity of high polymers from −180°C. to 90°C.
Abstract Systematic measurements of the thermal conductivity of plastics have been undertaken by various methods and checked against each other. Between −180 and +100°C. the thermal conductivity depends only slightly on the temperature. For instance, amorphous plastics and natural rubber show a break in the curve at t…
Permeation, solution, and diffusion of water in some high polymers
Abstract The equilibrium sorption isotherms of water in polyethylene terephthalate, ethyl cellulose, and rubber hydrochloride have been measured at 25°C. by means of the quartz helix technique. The permeability constants and the diffusion constants have been measured on the same polymers and on polyethylene and polypr…
Sintering Alumina: Effect of Atmospheres
Two effects of atmosphere on the sintering of alumina powder compacts were investigated. Changing the oxidizing conditions during early‐stage sintering measurements showed that, within the range −70°F dew point oxygen to −70°F hydrogen equilibrated with alumina, there was no observable effect on sintering rate. The ef…
Diffusion of ideal gases in capillaries and porous solids
Abstract The steady state diffusion of gases through capillaries or through the pores of a solid when the total pressure in the system is constant is considered. It is shown that the ratio of the molar diffusion rate of the lighter gas to that of the heavier gas must be equal to the square root of the ratio of the mol…
La calidad en la construcción española
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Fisicoquímica del sistema refractario-clínker en los hornos de cemento
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Conferencia de R. Blachère en el Instituto Eduardo Torroja de la Construcción y del Cemento
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La mayor fábrica de cemento del mundo
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Bibliografía
Nuevas interpretaciones de antiguos conceptos sobre el terreno como soporte de firmes blancos
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Dünnste Kohlenstoff-Folien
Bei der Reduktion von Graphitoxyd in sehr verdünnter alkalischer Suspension entsteht extrem feinlamellarer Kohlenstoff. Die Bestimmung der Dicke der dünnsten Lamellen aus dem Kontrast im Elektronenmikroskop ergab, daß sie nur aus einigen wenigen, z. T. wahrscheinlich nur aus einer einzigen Kohlenstoff-Sechseckschicht…
Thermoelectric Properties of Bismuth-Antimony Alloys
The thermoelectric figure of merit (z), resistivity, and Seebeck coefficient have been measured between 20° and 300°K on single crystals of several alloys in the range from 1% to 40% antimony in bismuth. These materials are semimetals (0 to 5% antimony) or small energy gap intrinsic semiconductors (5 to 40% antimony)…
Far-Infrared Ferroelectric Vibration Mode in SrTiO3
The real and imaginary parts of the dielectric constant of SrTi${\mathrm{O}}_{3}$ have been obtained for the region 2.5 to 3000 ${\mathrm{cm}}^{\ensuremath{-}1}$ from an analysis of the reflectivity. The imaginary part exhibits a very strong peak at 100 ${\mathrm{cm}}^{\ensuremath{-}1}$ at room temperature which shift…
Anomalous Magnetic Moments and Transformations in the Ordered Alloy FeRh
Magnetization and electrical resistivity measurements on an iron-rhodium alloy of approximate composition FeRh, having CsCl-type structure, confirm recent x-ray and neutron diffraction evidence for a first-order antiferromagnetic-ferromagnetic transition at about 350°K. From 350°K down to 77°K, an essentially constant…