Le cacutohouc dans l'industrie du bâtiment
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Materials Literature
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El cemento Sorel sus aplicaciones (conclusión)
V Congreso Internacional de cerámica
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Influencia de la adición de determinados agentes tensoactivos en la retracción de las pastas y morteros de cemento Portland
Se considera en este trabajo, por una parte, el mecanismo de la acción de los agentes tensoactivos; por otra, las distintas teorías emitidas sobre el fenómeno de la retracción y finalmente los resultados experimentales en cuanto a los efectos de la presencia del “Plastiment” como agente tensoactivo en las pastas y mor…
Les pulvo-sécheurs et leurs applications dans l’industrie céramique
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Viscosity of clay suspensions in the presence of polyanionic flocculants
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Les naphténates dans la conservation du bois
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The rapid determination of cement content in concrete and mortar
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Stress Relaxation Studies of the Viscoelastic Properties of Polymers
Extensive studies of the viscoelastic properties of polymers undertaken in the author's laboratory by means of the method of stress relaxation are here reviewed. The discussion is divided into four parts: chemical stress relaxation, stress relaxation in amorphous polymers, stress relaxation in crystalline polymers, an…
LXVIII. Direct observations of the arrangement and motion of dislocations in aluminium
Electron optical experiments on Al foils have revealed individual dislocations in the interior of the metal. The arrangement and movement of individual dislocations have been observed. Most of the dislocations occur in the boundaries of a substructure, the diameter of the subrains being of the order of 1 μ, or more. T…
Electrical Resistance of Ferromagnetic Metals
In ferromagnetic metals an anomalous electrical resistance is observed which is characteristic of the magnetization and is additive to the ordinary electrical resistance. The origin of this anomalous electrical resistance has been discussed by several authors, but all such attempts do not seem to have satisfactorily e…
Nuclear Magnetic Relaxation in Antiferromagnetics
The mechanism of the thermal relaxation of nuclear spins related with the nuclear magnetic resonance in antiferromagnetics is studied theoretically. The predominant mechanism is provided by the fluctuating local magnetic field at the nucleus coming from the electron spins which flip from time to time due to exchange i…
Application of Dislocation Theory to Internal Friction Phenomena at High Frequencies
A detailed discussion of data obtained over the past 15 years concerning the damping of mechanical vibrations in the kilocycle and megacycle range is given. The dependence of the decrement and modulus change on the variables of frequency and strain-amplitude and many other parameters is compared with predictions of th…
A Theory of Metallic Ferro- and Antiferromagnetism on Zener's Model
The importance to the mechanism of ferromagnetism of exchange interaction between conduction electrons and unfilled inner shell electrons (called s-d interaction) has been pointed out by Zener. Especially for rare earth metals, this interaction seems to be the only mechanism which can cause ferro- and antiferromagneti…
Multiple Elastic Scattering in Electron Diffraction by Crystals
In the case of electron diffraction by crystals containing heavy atoms, it is possible to improve the usual kinematical theory by formulating a pseudokinematical theory, which is expressed in terms of rigorous atomic scattering amplitudes rather than their Born-approximation values. A corresponding improvement can be…
Specific Heat of a Magnetite Crystal at Liquid Helium Temperatures
The heat capacity of a large natural crystal of magnetite was measured between 1.8 and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The specific heat, as a function of temperature, is resolved into two parts: a ${T}^{3}$ term that presumably is the lattice heat, and a ${T}^{\frac{3}{2}}$ term that may be identified as a s…
An Antiferromagnetic Transition in Zinc Ferrite
Neutron powder diffraction patterns have been obtained for zinc ferrite over the temperature range 2.7\ifmmode^\circ\else\textdegree\fi{}K-300\ifmmode^\circ\else\textdegree\fi{}K. The data strongly suggest that the compound undergoes a transition from a paramagnetic state to an antiferromagnetic state in the neighborh…
Thermionic Emission, Field Emission, and the Transition Region
Although the theories of thermionic and field emission of electrons from metals are very well understood, the two types of emission have usually been studied separately by first specifying the range of temperature and field and then constructing the appropriate expression for the current. In this paper the emission is…
Thermochemistry and reactivity of the azides - II. Lattice energies of ionic azides, electron affinity and heat of formation of the azide radical and related properties
Abstract The thermochemical data of part I, the heats of formation and solution of the alkali-metal (group 1a ) azides, are used in conjunction with other data to derive values for the lattice energies of alkali-metal azides, the heat of formation of the azide radical, for the electron affinity and hydration heat of t…
Mastication of Rubber. II. Interpolymerization of Natural Rubber and Neoprene on Cold Milling
Abstract The softening of elastomers on cold milling results from scission of the polymer molecules by the applied shearing forces. The ruptured chains are free radicals, which can undergo mutual combination, interaction with oxygen and various additives, and branching (grafting) on to other polymer molecules. A gener…