Properties and Structure of Polymers
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Materials Literature
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Embedding in Epoxy Resins for Ultrathin Sectioning in Electron Microscopy
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…
An electron microscope study of synthetic graphite
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…
Electrical Resistivity of Yttrium Single Crystals
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…
Interpretation of Magnetic Properties of Dysprosium
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…
Saturation Magnetization of Nickel Films of Thickness Less Than 100 A
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…
On Geoplanides from Brazil
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…
OBSERVATIONS ON THE SYSTEM ZIRCONIUM IRON
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…
The Calculation of Electrostatic Electron-gun Performance†
An automatic electron trajectory tracer has been used to analyse four different high current density electron guns operated electrostatically.
Rupture Characteristics of Safety Diaphragms
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.…
Exchange of Deuterium and Heavy Oxygen among Hydrogen, Water Vapor and Oxide Catalysts of Spinel Type
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…
PRECIPITATION PHENOMENA IN COBALT-TANTALUM ALLOYS
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…
The Relation between the Deformation of Substrate of PV A Sheet by Stretching and the Stretch Ratio Rs
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
The Melt Refining of Irradiated Uranium: Application to EBR-II Fast Reactor Fuel. I. Introduction
A process for recycling plutonium and uranium alloy fuels is described; it involves melting and liquating the alloys in ceramic crucibles and casting the partially purified metals. Its particular merit is the rapid turnover of a fuel suitable for a fast reactor. A pilot plant, now under construction, will operate in a…
Nitroparaffins as Potential Engine Fuel
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitroparaffins as Potential Engine FuelE. S. StarkmanCite this: Ind. Eng. Chem. 1959, 51, 12, 1477–1480Publication Date (Print):December 1, 1959Publication History Published online1 May 2002Published inissue 1 December 1959https://pubs.acs.org/doi/10.1021/ie50600a035https://…
Sauter Theory of the Photoelectric Effect
Results of Sauter are expressed in the form of a transition matrix which determines the photoelectric effect cross section for arbitrary x-ray polarization and arbitrary initial and final orientations of the electron spin. The structure of the matrix elements accounts for curious properties of the cross section in ter…
40—A DIRECT METHOD FOR MEASURING YARN DIAMETERS AND BULK DENSITIES UNDER CONDITIONS OF THREAD FLATTENING
With normal types of woven fabric, the assumption of a circular thread cross-section is frequently invalid owing to the considerable thread flattening which usually occurs during weaving. As a basis for studies of fabric structure, therefore, a method has been devised whereby measures of both major and minor thread di…
Bremsstrahlung and the Photoelectric Effect as Inverse Processes
The bremsstrahlung matrix element at the short-wavelength limit of the spectrum is calculated to lowest order in $\ensuremath{\alpha}\ensuremath{\equiv}\frac{Z}{137}$, for an unscreened Coulomb field. The result, valid for relativistic incoming electrons, is shown to be exactly ${\ensuremath{\alpha}}^{\ensuremath{-}1}…
Yoderite, a new hydrous magnesium iron aluminosilicate from Mautia Hill, Tanganyika
Summary Yoderite occurs as a major constituent in a quartz-kyanite-tale schist, and is a high-pressure phase formed by the reaction Ky + Tc → Yd + Qu. The monoclinic unit-cell, a 8·10 Å., b 5·78 Å., c 7·28 Å., β 106°, space-group P 2 1 or P 2 1 m , contains approximately (Mg 2·0 Ca 0·2 Fe 0·5 Al 5·3 Si 4·0 O 17·6 (OH)…
Organic Carbonates. IV.1a,b,c Factors Affecting Formation of Homologous Cyclic Carbonates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Carbonates. IV.1a,b,c Factors Affecting Formation of Homologous Cyclic CarbonatesSHALOM SAREL, LEO A. POHORYLES, and RAPHAEL BEN-SHOSHANCite this: J. Org. Chem. 1959, 24, 12, 1873–1878Publication Date (Print):December 1, 1959Publication History Published online1 May…