Estructura y propiedades físicas de la pasta de cemento, fraguado
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Cenizas de combustibles españoles. Propiedades aglomerantes
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Thermal Expansion of Al 2 O 3 , BeO, MgO, B 4 C, SiC, and TiC Above 1000°C.
Thermal‐expansion data on Al 2 O 3 , BeO, MgO, B 4 C, SiC, and TiC were obtained to the temperatures where permanent deformation begins, due to sintering or other causes. The thermal expansion for these materials was found to be approximately linear over the measured temperature range. But as a linear extrapolation to…
Single Crystal Anisotropy and Magnetostriction Constants of Several Ferromagnetic Materials Including Alloys of NiFe, SiFe, AlFe, CoNi, and CoFe
The anisotropy and magnetostriction of single crystals of several ferromagnetic materials have been determined experimentally. The materials include the metals iron and nickel, binary alloys of nickel iron, silicon iron, aluminum iron, cobalt nickel, and cobalt iron, ternary alloys of molybdenum nickel iron, nickel co…
Solubility of Carbon in Silicon and Germanium
The solubility of carbon in silicon has been measured over the temperature range 1560 to 2900°C. The enthalpy of solution is 59±3 kcal/mole. A phase diagram for the system Si–C is presented, embodying these solubility data as well as the results of other high-temperature experiments with silicon carbide. It is found t…
Infrared spectra of crystalline polysaccharides. I. Hydrogen bonds in native celluloses
Abstract The infrared spectra of oriented films of valonia cellulose and of ramie and bacterial cellulose crystallites have been observed in the 3 μ region. Polarization properties of the bands have also been determined. The differences between the polarized spectra of bacterial and ramie crystallites in this region a…
A New Type of Antiferromagnetic Structure in the Rutile Type Crystal
A new type of antiferromagnetic spin arrangement, which is theoretically possible in the rutile type crystal and seems to be realized in polianite, MnO 2 , is proposed. This spin arrangement, which will be named the screw-type structure , consists of spins screwing along the four-fold crystalline axis. The stability r…
The growth of grain-boundary voids under stress
The effect of combined hydrostatic pressure, P, and of uniaxial tension, [sgrave], on the rupture time of polycrystalline copper wire in the temperature range 400° to 500°c has been determined. All the specimens broke by intergranular fracture, due to the growth of voids along grain boundaries. Preliminary experiments…
Electron Spin Resonance Experiments on Donors in Silicon. I. Electronic Structure of Donors by the Electron Nuclear Double Resonance Technique
The ground-state wave function of the antimony, phosphorus, and arsenic impurities in silicon has been investigated by means of the electron nuclear double resonance (ENDOR) method. By this method the hyperfine interactions of the donor electron with the ${\mathrm{Si}}^{29}$ nuclei situated at different lattice sites…
Thermoluminescence andF-Centers. I. Theory
After a critical review of the present state of knowledge about thermoluminescence, which is shown to be rather unsatisfactory, the present paper considers in detail thermoluminescence arising from thermal bleaching of $F$-centers in irradiated alkali halides. A model is proposed, which leads to second-order kinetics…
Scattering of Phonons by Elastic Strain Fields and the Thermal Resistance of Dislocations
A theory of the scattering of phonons by static elastic strain fields is presented. It is found that the Fourier component of the strain field plays a role similar to that of the potential in the external field approximation. All quantities (except the strain field) in the formulas obtained refer to specifically atomi…
Prevention of Ozone Attack on Rubber by Use of Waxes
Abstract The tendency for stretched rubber, when subjected to outdoor exposure, to form cracks perpendicular to the direction of stress was originally known as suncracking. The work of Newton showed that light was not necessary and identified ozone as the causative agent. That ozone is the principal factor there seems…
19—THE EFFECT OF WEFT YARN IRREGULARITY ON PICKSPACING AND WEFT COVER FACTOR
It is shown that long-period count variations in the weft yarn cause variations in pickspacing which to some extent compensate for the effect of yarn irregularity on the weft cover factor. The significance of this fact in relation to the diagnosis of weft bars, to fabric design, and to loom design, pointed out. It is…
THE TITANIUM-MAGNESIUM SYSTEM
To obtain an equilibrium between titanium and magnesium at high temperatures, an air-tight titanium container, in whlch a magnesium rod or a mixture of titanium and magnesium in equal parts was placed, was heated to various temperatures up to 1200 C. The results of microscopic, x-ray, and electron diffraction studies…
Infrared spectrum of polyvinyl chloride. II
Abstract In order to assign the CH, CH 2 ‐vibration modes and the skeletal modes in the spectrum of polyvinyl chloride, we obtained deuterated polyvinyl chloride and the infrared spectrum of it, and we assumed that frequencies of the skeletal modes and the C‐Cl stretching modes may not change drastically by deuteratio…
Pore Structure of Sintered Glass from Diffusion and Resistance Measurements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPore Structure of Sintered Glass from Diffusion and Resistance MeasurementsI. FattCite this: J. Phys. Chem. 1959, 63, 5, 751–752Publication Date (Print):May 1, 1959Publication History Published online1 May 2002Published inissue 1 May 1959https://pubs.acs.org/doi/10.1021/j150…
Preliminary Identification of Crystalline Phases in a Transparent Stalactite
A phenotypic male of Mollienesia formosa, a gynogenetic fish, has been collected at Brownsville, Texas. The male and female fish are essentially similar, and their morphology supports a hypothesis that the species is of hybrid origin.
Syntheses of Thermochromic Ethylenes. A Study of the Relationship between Constitution and Thermochromism
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of Thermochromic Ethylenes. A Study of the Relationship between Constitution and ThermochromismAlexander Schönberg and Mahmoud Mohamed SidkyCite this: J. Am. Chem. Soc. 1959, 81, 9, 2259–2262Publication Date (Print):May 1, 1959Publication History Published online1…
The atomic diffusion of chromium in the titanium-chromium system
Diffusion rates of chromium in the body centred cubic phase of the titanium—chromium system have been measured by an autoradiographic tracer technique using the radioactive isotope 51Cr. Two alloys, Ti + 10% Cr and Ti+18% Cr (by weight), in addition to two grades of Ti metal, ‘iodide’ and ‘commercial’, were used as so…
Equilibrium Polymerization of ε-Caprolactam
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium Polymerization of ε-CaprolactamA. V. Tobolsky and A. EisenbergCite this: J. Am. Chem. Soc. 1959, 81, 10, 2302–2305Publication Date (Print):May 1, 1959Publication History Published online1 May 2002Published inissue 1 May 1959https://pubs.acs.org/doi/10.1021/ja0151…