The durability of reinforced concrete in sea water
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Materials Literature
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Efecto del polvo de los hornos de cementos sobre plantas y animales
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Secado eléctrico de prefabricados de hormigón
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Contribución al análisis rápido en la industria del cemento
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Consolidación sobre mesas de sacudidas de hormigones compuestos con áridos ligeros
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Consecuencias de la ley editada con objeto de mantener puro el aire en la industria del cemento
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Tendencias actuales en la construcción de maquinaria para la fabricación de cemento
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Equivalencia aproximada entre las resistencias a la compresión de los morteros de cemento Portland según los Pliegos españoles de 1930, 1960 y algunas Normas extranjeras
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Examen sobre la compactación del hormigón sobre mesas de sacudidas en moldes fijos y móviles
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Cantidad de polvos arrastrados por los gases que atraviesan un cilindro rotatorio
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Electrical Conduction inp-Type Titanium Sesquioxide
The Hall effect, thermoelectric power, and electrical conductivity have been measured as a function of temperature in crystals of $p$-type titanium sesquioxide. A transition is observed at about 450\ifmmode^\circ\else\textdegree\fi{}K. Below this temperature the crystals behave like semiconductors, while above it the…
Diffusion along Small-Angle Grain Boundaries in Silicon
Diffusion fronts in samples containing grain boundaries are spike shaped. Velocity of spike advance and angle between spike and boundary are measured. The "spike-velocity method" of analysis permits evaluation of two effective widths, ${W}_{D}$ and ${W}_{0}$, which describe the diffusion properties of the boundary. Th…
Some New Interrelations in the Properties of Solids Based on Anharmonic Cohesive Forces
The lattice vibration spectrum of a solid can be characterized by one single frequency, which is defined as "the frequency of the center of gravity" of this spectrum or simply "center frequency." From its equality with the characteristic frequency of specific heat we have recently derived the "center law of the lattic…
Stimulated Optical Emission in Fluorescent Solids. II. Spectroscopy and Stimulated Emission in Ruby
Optical absorption cross sections and the fluorescent quantum efficiency in ruby have been determined. This data has been used to correlate calculations with the analysis of the preceding paper. Stimulated emission from ruby under pulsed excitation has been studied in some detail; the observations are found to depend…
Die biochemischen Grundlagen der „Polyacetat‐Regel”
Abstract Natürlich vorkommende organische Substanzen sind vielfach nach gewissen Regeln, Gesetzmäßigkeiten, gebaut. Solche Bauregeln sind nicht nur zur Konstitutionsaufklärung neuer Naturstoffe nützlich, sondern können, wie hier gezeigt wird, auch bei der Erforschung biochemischer Umsetzungen als Leitfaden dienen. Aus…
THE SAFETY OF RESEARCH REACTORS
The safety problems of research reactors are discussed. Safety of these reactors depends principally from the rahin them, and the penetrating radiations emitted. The safety requirements for reactivity containments, control instruments and mechanisms, guaranteed supplies, and operations of the research reactors are des…
Particle Self-Shielding in Plates Loaded with Spherical Poison Particles
An approximate heuristic expression for the particle self-shielding factor for a set of purely absorbing spheres of radius r and volume fraction V well mixed with another set of non-absorbing spheres has been derived.The resulting expression has been experimentally verified using transmission data at several incident…
Termination in anionic polymerization of octamethylcyclotetrasiloxane. formation of stable complexes on active sites
Abstract The ionic polymerization of octamethylcyclotetrasiloxane (the tetramer) proceeds through successive additions of tetramer on active centers. The active centers consist of the ion‐pair magnified image (where M stands for Na, K, Rb, Cs, Me 4 N−, Bu 4 P−, etc.) formed through the reaction of the hydroxide (oxide…
Neutralization of residual catalyst in polydimethylsiloxane. effect of neutralization on the thermal stability of the polymer
Abstract It is known that the thermal stability of polydimethylsiloxane is adversely affected by the presence in the siloxane polymer of active chain ends (i.e., by residual catalyst). The presence of catalyst causes the degradation reactions to proceed through an ionic mechanism (as opposed to the free‐radical mechan…
Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading
Stress-strain curves at rates of straining up to 440,000%/min. have been obtained for a number of textile yarns by a technique involving high-speed photography of the yarn following transverse impact. These curves and others obtained at conventional speeds are presented for samples of acetate, triacetate, cotton, poly…