Materials Literature
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The basic requirements of a garment in use and basic techniques in garment manufacture are briefly discussed. The relevant mechanical properties, of buckling, compression in the plane of the fabric and shearing are described and methods of measurement are indicated. It is argued that there are upper and lower limits t…
The method of Luttinger and Tisza for finding the rigorous minimum of a quadratic form subject to certain strong constraints is generalized. In the extended method, one still minimizes the quadratic form with respect to a single weak constraint, which however now contains adjustable parameters. In determining the grou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT7,7,8,8-TETRACYANOQUINODIMETHANE AND ITS ELECTRICALLY CONDUCTING ANION-RADICAL DERIVATIVESD. S. Acker, R. J. Harder, W. R. Hertler, W. Mahler, L. R. Melby, R. E. Benson, and W. E. MochelCite this: J. Am. Chem. Soc. 1960, 82, 24, 6408–6409Publication Date (Print):December 1,…
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Abstract A description is given of the ultra-structure of the eye of Drosophila melanogaster during its development from the imaginal bud of the late larva till it attains its final form in the adult. Six markedly different types of cells develop out of the apparently uniform epithelium of the imaginal bud; namely, co…
The fluorescence emission and excitation, reflection, and transmission spectra of 22 different NaI crystal samples grown in crucibles of Pt or quartz under atmospheres of ${\mathrm{N}}_{2}$ or ${\mathrm{H}}_{2}$ or ${\mathrm{H}}_{2}$ plus ${\mathrm{I}}_{2}$ and in some cases containing stoichiometric excess of Na or $…
The two Hall coefficients and the resistivity of Ni-Pd alloys have been measured from 4\ifmmode^\circ\else\textdegree\fi{}K to room temperature using fields up to 3.1 webers/${\mathrm{m}}^{2}$. The ordinary Hall coefficient is found to decrease in magnitude for small additions of Pd in Ni, but to increase as more Pd i…
The consequences of a simple, phenomenological, theory of lattice thermal conductivity with respect to the effect of point imperfections are summarized. The experimental results of Berman et al. on the effect of varying the concentration of ${\mathrm{Li}}^{6}$ on the conductivity of lithium fluoride are analyzed in de…
Radiation damage events at low and moderate energies (up to 400 ev) are studied by machine calculations in a model representing copper. Orbits of knock-on atoms are found and the resulting damaged configurations are observed to consist of interstitials and vacancies. Thresholds for producing permanently displaced atom…
Abstract The inability of polymer chains to deform the required amount within the time allowed by a stress‐to‐failure event results in brittle failure. Factors related to brittle behavior of films were investigated. By both conventional and novel testing techniques, stress–time–temperature relationships were studied t…
Abstract The literature reports that hydrolysis of cellulose under heterogeneous conditions proceeds by an initially rapid attack on the amorphous regions and then a much slower hydrolysis of the ordered regions or “crystallites.” During such hydrolysis, the degree of polymerization (D.P.) of cellulose initially decre…
Abstract An understanding of the formation of urethan foams involves consideration of the organic chemistry of the reactions leading to gas formation and molecular growth, the colloid chemistry of nucleation phenomena and bubble stability, and the rheology of the polymer system as it cures. Experimental data are not a…
The electrical properties of materials in the system lead‐barium niobate are described. Particularly useful materials are obtained when between 25 and 50 mole % of lead niobate is replaced by barium niobate. Materials with a 40 to 45 mole % replacement have permittivities of more than 1500 and radial electromechanical…