Materials Literature
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A distinction is made between the surface Helmholtz free energy F , and the surface tension γ. The surface energy is the work necessary to form unit area of surface by a process of division: the surface tension is the tangential stress (force per unit length) in the surface layer; this stress must be balanced either b…
The energies and motions of grain boundaries between two crystallites are investigated theoretically using the dislocation model of grain boundaries. Quantitative predictions made for simple boundaries for cases in which the plane of the boundary contains the axis of relative rotation of the grains appear to agree wit…
This significant volume is a progress report of the research work on the most efficient and practical methods of protecting man against the extremes of external temperatures such as encountered in the polar regions, in equatorial deserts and at high altitudes in the air. This work, by competent biologists, medical doc…
Abstract A graphical method for interpreting refraction profiles is presented by means of a complete solution of a numerical example.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid Corrosion Resistance of Tantalum, Columbium, Zirconium, and TitaniumDonald F. TaylorCite this: Ind. Eng. Chem. 1950, 42, 4, 639Publication Date (Print):April 1, 1950Publication History Published online1 May 2002Published inissue 1 April 1950https://pubs.acs.org/doi/10.1…
In t he course of an investigation to determine which rubbers might be suitable fo r usc at low temperatures, interferometric m eas urem e nts of the length-temp erature relat ionships of silicone rubbers have been made . C rystall ization was found between -60 a nd -67 C in Dow-Corning SiJastic X -6160 and in Ge nera…
Solid solution in titanates has been studied by X‐ray diffraction, with particular emphasis on barium, calcium, and strontium titanates. It was found that the lattice constants varied linearly with the atomic percentage of the solute, with a positive deviation for the calcium‐strontium solutions, and the two ternary s…
"The literature is reviewed and new data on the jadeite problem are presented which redefine the probable stability range of jadeite. The mineral is known to occur in only three places: in Burma, as small masses in serpentine with albite or nepheline, or both; in Japan, also as small masses in serpentine with albite a…
One factor inherent in most electron microscopes is the magnetic asymmetry (astigmatism) in the objective lens. This is often due to imperfect machining, localized defects (impurities) in the iron, or grain anisotropies. The lapping technique described herein effectively reduces the effect of imperfect machining (misa…
High and uniform absorbency of cotton fabrics is a desirable quality in nearly every wet- finishing operation and in many finished fabrics; yet absorbency-measuring tests which have been employed up to the present time are largely inadequate and arbitrary. A test method is described here which is more suitable in that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis of Vulpinic Acid from Polyporic Acid1Robert L. Frank, George R. Clark, and James N. CokerCite this: J. Am. Chem. Soc. 1950, 72, 4, 1824–1826Publication Date (Print):April 1, 1950Publication History Published online1 May 2002Published inissue 1 April 1950https:/…
The Thomas-Fermi statistical theory of the free atom is used to calculate the momentum distribution and the shape of the Compton profile for X-ray scattering, the results being expressed in dimensionless form applicable to all atoms. The mean momentum, which varies as Z 2/3 , where Z is the atomic number, agrees well…
To the definition of the state of ``liquid with thermally fixed structure'' is added that of ``liquid with chemically fixed structure.'' Polystyrene is combined with increasing proportions of divinylbenzene. The resulting space network is represented analytically by means of the definition of a mesh width. The second-…
The influence of hydrostatic pressure on the Curie temperature of BaTi${\mathrm{O}}_{3}$ single crystals has been investigated. With increasing pressure a linear shift of the Curie point towards lower temperature is observed with a slope of -5.8\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$ degree/atmos. T…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTCopolymerization.Frank R. Mayo and Cheves. WallingCite this: Chem. Rev. 1950, 46, 2, 191–287Publication Date (Print):April 1, 1950Publication History Published online1 May 2002Published inissue 1 April 1950https://pubs.acs.org/doi/10.1021/cr60144a001https://doi.org/10.1021/cr601…
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