Materials Literature
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A study of the effects of very high electron densities on the absorption of radiation by free-free electron transitions. The absorption coefficient is expressed in terms of a dimensionless quantity known as the Gaunt factor.
ABSTRACT High-pressure compaction studies (up to 200,000 psi) were conducted on kaolinite, illite, and montmorillonite clays and a natural organic colloid of Iranian origin, gum tragacanth. The remaining moisture content in per cent (dry weight) was plotted versus the logarithm of pressure in psi. For kaolinite clay t…
The five independent elastic constants of beryllium have been determined with the pulse echo technique at a frequency of 10 Mc/sec. The values extrapolated to 0°K are C11=29.94±0.06, C33=34.22±0.12, C44=16.62±0.05, C12=2.76±0.08, C13=1.1±0.5 in units of 1011 dyne/cm2. Voigt averaging and Reuss averaging of the single…
This is the Thirty-fourth Edward De Mille Campbell Memorial Lecture, presented by Alexander R. Troiano, Chairman, Department of Metallurgical Engineering, Case Institute of Technology, Cleveland. The lecture was presented November 4, 1959 during the Forty-first Annual Convention of the American Society for Metals, hel…
The optical behaviour of a surface carrying a transition layer is discussed, as a problem in scattering. The results are given of the application of electromagnetic theory to the case of a single parallel-sided film. Methods are given for extending this treatment to the case of multiple parallel-sided layers. Both ana…
Measurements of change in length and change in lattice parameter were made at identical temperatures on 99.995% aluminum in the temperature range 229 to 656\ifmmode^\circ\else\textdegree\fi{}C. Length changes, $\ensuremath{\Delta}L$, were measured on an unconstrained horizontal bar sample using a rigid pair of filar m…
in the free growth rate law is predicted under various assumptions. To the extent that comparison is possible, the predictions given agree with the experimental results obtained by Keller and O'Connor and others on single crystals of unbranched polyethylene grown from dilute solution. A survey is given of homogeneous…
Abstract not Available.
Fixed tissue is dehydrated with tertiary butyl alcohol overnight. The following day it is cleared in toluene, infiltrated and embedded in Araldite resin-hardener-accelerator mixture without dibutyl phthalate, and polymerized at 60° C. More rapid than previous techniques, this method gives blocks which do not fracture…
Abstract The ultra-microtome has been used to obtain thin sections of synthetic graphite blocks. The thickness of the sections was measured by shadowcasting and measuring the shadow length at appropriate edges. An average value of 150 Å was obtained. Transmission electron micrographs of thin sections showed moire patt…
Two samples of yttrium cut from the same single crystal were used to determine the electrical resistivity parallel and perpendicular to the $c$-axis of the hexagonal close-packed metal. Measurements were made over the temperature range from 1.3 to 300\ifmmode^\circ\else\textdegree\fi{}K. A large anisotropy was observe…
Dysprosium is ferromagnetic below 85\ifmmode^\circ\else\textdegree\fi{}K, antiferromagnetic between 85 and 179\ifmmode^\circ\else\textdegree\fi{}K, and paramagnetic above 179\ifmmode^\circ\else\textdegree\fi{}K. The spontaneous magnetic moment lies always in the basal plane, and there is anisotropy in this plane below…
Nickel films varying in thickness from 200 to 3 A were prepared by evaporation on glass substrates in a vacuum sufficiently high to prevent gas adsorption on the film during preparation and measurement. Their magnetization was measured as a function of field up to 10 000 oe using a vacuum torsion magnetometer. The sat…
O trabalho presente refere-se principalmente a planárias terrestres coligidas nos Estados de Santa Catarina e do Rio Grande do Sul. Entre as espécies já conhecidas são estudadas anatômicamente Geoplana marmorata Fr. Mull., G. mulleri Dies., G. carrièrei Graff e G. ladislavii Graff. G. marginata var. abundans Graff é c…
The solubility of iron in zirconium was determined to be between 0.017 and 0.025 wt.% in the alpha -phase. The observation of fine ZrFe/sub 2/ particles in a specimen of 0.012 wt.% Fe alloy quenched from 700 deg C indicates that the solubility drops below this composition at 700 deg C and lower. A singlephase ZrFe/sub…
An automatic electron trajectory tracer has been used to analyse four different high current density electron guns operated electrostatically.
Abstract Instability (maximum pressure) criteria for materials obeying a parabolic stress-strain law are investigated. Two special solutions are formulated, accompanied by the instability condition obtained from the author’s approximate theory. Bursting pressure is most accurately predicted by the approximate theory.…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTExchange of Deuterium and Heavy Oxygen among Hydrogen, Water Vapor and Oxide Catalysts of Spinel TypeYukio Yoneda, Akio Fujimoto, and Shoji MakishimaCite this: J. Phys. Chem. 1959, 63, 12, 1987–1990Publication Date (Print):December 1, 1959Publication History Published online1 Ma…
The precipitation phenomena occurring in cobalttantalum alloys were investigated in the temperature range from 500 to 1050 deg C by correlating the results of metallographic, X-ray, micro- and macrohardness, and electrical resistivity studies. The property changes were found to depend on general precipitation and lame…
Yoshié Tanizaki, Teruaki Kobayashi, Noboru Ando; The Relation between the Deformation of Substrate of PV A Sheet by Stretching and the Stretch Ratio Rs, Bu