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…

Material Selection and Properties

Dislocation Models of Crystal Grain Boundaries

W. T. Read、W. Shockley1950-05-01OpenAlex

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…

Force Microscopy Techniques and ApplicationsMicrostructure and mechanical propertiesElectromagnetic Effects on Materials

Physiology of Heat Regulation and the Science of Clothing

作者信息未提供1950-04-22JAMA

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…

Textile materials and evaluations

A graphical method for the interpretation of refraction profile data

M. M. Slotnick1950-04-01Geophysics

Abstract A graphical method for interpreting refraction profiles is presented by means of a complete solution of a numerical example.

Optical Coatings and Gratings

Acid Corrosion Resistance of Tantalum, Columbium, Zirconium, and Titanium

Donald F. Taylor1950-04-01Industrial & Engineering Chemistry

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…

Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metals

Crystallization and second-order transitions in silicone rubbers

C. E. Weir、W. H. Leser、Lawrence A. Wood1950-04-01Journal of research of the National Bureau of Standards

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…

Polymer Nanocomposites and PropertiesForce Microscopy Techniques and Applications

Solid Solubility Study of Barium, Strontium, and Calcium Titanates

Gerald F. Durst、M. Grotenhuis、A. G. Barkow1950-04-01Journal of the American Ceramic Society

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…

Thermal and Kinetic AnalysisInorganic Chemistry and MaterialsFerroelectric and Piezoelectric Materials

The jadeite problem, part I

H. S. Yoder1950-04-01American Journal of Science

"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…

Clay minerals and soil interactions