Materials Literature
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Por vía teórica también experimentalmente se llega a la conclusión de que, en general, es conveniente elevar la cifra máxima SO3 mantenida en la actualidad en la mayor parte de las normas para cemento. Esta medida es particularmente beneficiosa en el aspecto de la retracción.
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Abstract The infrared spectrum of polyvinyl alcohol has been investigated between 3600 and 70 cm. −1 . Polarization measurements on stretched specimens were made down to about 330 cm. −1 . The spectrum of a deuterated specimen (about 90% of the OH having been replaced by OD) has also been obtained. These data confirm…
The intermetallic compound, BiMn, has been studied by neutron diffraction at temperatures from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 733\ifmmode^\circ\else\textdegree\fi{}K (460\ifmmode^\circ\else\textdegree\fi{}C). In the temperature range 340-360\ifmmode^\circ\else\textdegree\fi{}C to 445\ifmmode^\circ\else\tex…
Various kinds of silica glass and natural and synthetic crystals have been irradiated with fast neutrons at temperatures of ∼250°C and above 300°C. In the glasses, asymmetric paramagnetic resonance lines resulting from the irradiation have been observed with apparent g values of 2.0013±0.0006 and 2.0090±0.0007, and ha…
Porous structures having a continuous solid phase with isolated pores were prepared by the addition of different amounts of crushed naphthalene to an alumina casting slip. Samples of from 5 to 50% porosity were fired together for comparable grain development, eliminating structural variables except porosity. Effects o…
The conduction-electron magnetic susceptibility of graphite has been calculated by using the Wallace two-dimensional band structure. The energy levels induced by the magnetic field are calculated by the method of Luttinger and Kohn, taking into account the large (in this case) effects of band-to-band transitions which…
The magnetic susceptibility of a powder sample of $\ensuremath{\alpha}\mathrm{MnS}$ was measured from 90\ifmmode^\circ\else\textdegree\fi{}K to 800\ifmmode^\circ\else\textdegree\fi{}K by an absolute Gouy method. The N\'eel temperature was found to be 154\ifmmode^\circ\else\textdegree\fi{}K. There was no evidence of th…
Previously published data on Auger ejection from tungsten include the effect of a two percent admixture of metastable ions in the ion beam for A, Kr, and Xe. Data on yield and kinetic energy distribution of electrons ejected by the normal singly-charged ion only are presented in this paper.
The presence in a semiconductor of both signs of current carriers makes it possible to disturb the spatial distribution of these carriers appreciably without giving rise to electrical space charge. As a result, the interaction of particles with acoustic waves leads to certain effects which, at least at low frequencies…
Neutron diffraction patterns have been obtained for polycrystalline Mn${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$ at 300\ifmmode^\circ\else\textdegree\fi{}K and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The fraction of tetrahedral sites occupied by ${\mathrm{Mn}}^{+2}$ has been found to be 0.81\ifmmode\pm\else\textpm\fi{}0.0…
Abstract The rate of oxidation of thin films of polybutadiene have been studied between 50 and 90°C. The films were prepared directly from latex by dipping, and thoroughly purified. The oxidation rates were found to go through an induction period, to accelerate rapidly to a maximum, and then to decrease to low values.…
All but one of the multiple ferromagnetic resonances observed by White and Solt in a sphere are shown to correspond to modes in which the oscillating part of the magnetization is independent of $r$ (the only case ordinarily considered) or varies linearly with $r$ in the sample.