Materials Literature
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Summary The structural stability of samples of 180 soils of known composition was examined by the Emerson test. This test is based on the swelling, slaking, and dispersion behaviour of soil aggregates when immersed in water and under mechanical stress. In the surface soils investigated there appeared to be a critical…
Kinetics and osmoregulation of cotton (Gossypium hirsutum L.) fiber growth (primarily extension) have been studied. Growth is dependent on turgor pressure in the fiber. It is inhibited when a decrease in the water potential of the culture medium due to an addition of Carbowax 6000, equals the turgor pressure of the fi…
Surface-potential decay characteristics of corona-charged insulators are analyzed theoretically. The effects of field-dependent drift mobility and injection efficiency, as well as time-dependent injection, are included. The theoretical results are compared with existing surface-potential decay data on polyethylene. At…
Composition and compressibility characteristics of Mexico City clay were investigated using samples with natural water contents in the range of 421–574%. The composition study included scanning electron microscopy, X-ray diffraction and chemical analyses, as well as measurements of physical properties. Compressibility…
Abstract The interaction between fumed silica and silicone elastomer after various treatments of the silica surface has been investigated. The effect of the treatments was determined by measuring bound rubber, an interaction coefficient by means of the oscillating disk rheometer, the mechanical properties of the vulca…
Abstract Experimental studies of structure development in melt spinning of polyethylene and polypropylene fibers are described. Emphasis is given to the influence of applied stresses on the rates of crystallization and on the development of crystalline morphology. The relationship of fiber morphology to mechanical pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNicotinamide adenine dinucleotide (NAD+) and related compounds. Electrochemical redox pattern and allied chemical behaviorConrad O. Schmakel, K. S. V. Santhanam, and Philip J. ElvingCite this: J. Am. Chem. Soc. 1975, 97, 18, 5083–5092Publication Date (Print):September 1, 197…
We describe and present results of a numerical method we have used to solve the hydrodynamic equations with negligible rates of change of momentum and angular momentum, but without other approximations, in a liquid-crystal twist cell. We verify that the ’’bounce’’ in transmission of normally incident light that is obs…
We have studied the structures of adducts formed between subtilisin BPN' and both benzeneboronic acid and 2-phenylethaneboronic acid by x-ray diffraction techniques. Electron density and difference maps at 2.5 A resolution were computed with phases calculated from a partially refined structure of the native enzyme (R…
Abstract A Deborah number is introduced as a means of characterizing diffusional transport in amorphous polymer‐solvent systems. Two types of temperature‐penetrant concentration diagrams are constructed, and the various regions on these figures are identified by their Deborah number values. The utility of the diffusio…
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Cu films of 1000 AA were grown at various substrate temperatures with increasing grain sizes at 10-5 Torr. The grain boundary resistivity ( rho gb=3.58*10-12 Omega cm2) and reflection coefficient (R=0.2635) at room temperature (22 degrees C) remained almost the same for different grain sizes, suggesting that the poten…
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