Materials Literature
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SYNOPSIS IN INTERLINGUA MAGNITUDE GRANULAR IN FUNDITE ALLICATOS DE AURO.—Le resistentia a traction e le elongamento de auros dental es augmentate quando le magnitude granular es raffinate. Le technica pro le raffinamento del grano in metallos fundite require le regulation del rapiditate con que nucleos de solidificati…
It is shown by contrast experiments that more than 95% of the dislocation loops observed in quenched aluminium (99·995% Al) have a Burgers vector 1/3<111> rather than 1/2<110>. This finding is confirmed by annealing experiments. The observation of large, faulted loops of dislocation in zonerefined aluminium (99·9999%…
Abstract Open-cell foams show abnormally large mechanical damping due to the energy dissipated in forcing air in and out of the foam during a deformation cycle. This pneumatic damping has recently been treated theoretically and experimentally. The dependence upon the test-piece dimensions, the frequency of deformation…
It has been shown that the overall kinetics of hydrogenation of coal can be explained on the basis of a two-stage reaction mechanism. The first stage involves the very rapid reaction of hydrogen with groupings in the coal which are associated with oxygen, and can be considered to be instantaneous in practical systems.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Ammonium Hexabromoantimonate, (NH4)4SbIIISbVBr12Stephen L. Lawton and Robert A. JacobsonCite this: Inorg. Chem. 1966, 5, 5, 743–749Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1966https://p…
A number of suitable rigid-molecule structures of boron compounds have been refined primarily to test a method of constraining the anisotropic temperature factors to agree with rigid motion. The structures reported have a wide range of success and should serve as a basis for comparing later work. In addition to giving…
Abstract X‐ray diffraction analysis of the < 2 µ fraction of the main horizons of a Deer Park sand, a Podzol soil in northern Michigan, shows that montmorillonite is the dominant layer silicate in the A2 horizon of this soil. This montmorillonite appears to have weathered from illite and mica and chlorite interstra…
The self-consistent perturbation theory developed in an earlier paper is formulated more explicitly and applied to various types of perturbation: (i) one-element change of the one-electron Hamiltonian matrix (i.e., of Coulomb or resonance integral), (ii) uniform electric field, (iii) point charge near the system. The…
By varying light and temperature, differences in diurnal ring structure were produced in cotton fibers from inbred lines of Deltapine 14 and Rex 25C belonging to the species Gossypium hirsutum. The relationships of the secondary wall structure to physical and chemical properties were then investigated. When fibers wer…
Abstract Investigations of the dynamic cut growth behavior of vulcanized rubbers indicate that there is a minimum tearing energy at which mechanical rupture of chains occurs. The limiting value is characteristic of each vulcanizate, but is in the region of 0.05 kg/cm. The mechanical fatigue limit, below which the numb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Six Trimethoxyphenylisopropylamines (Trimethoxyamphetamines)Alexander T. ShulginCite this: J. Med. Chem. 1966, 9, 3, 445–446Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1966https://pubs.acs.org/doi/10.1021/jm00…
Abstract The rate of growth of bubbles forming on a wall from a liquid initially uniformly supersaturated with a dissolved gas was investigated. Attention was directed to the effect of the contact angle. Theoretical predictions for the growth rate of a spherical bubble tangent to a wall were carried out with a digital…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Absorption Spectra of Inorganic Solids. IV. Hexafluorosilicates. Raman Spectra of Aqueous SiF62-R. B. Badachhape, G. Hunter, L. D. McCory, and J. L. MargraveCite this: Inorg. Chem. 1966, 5, 5, 929–931Publication Date (Print):May 1, 1966Publication History Published…
A large glass‐forming region was discovered in the system EUO–Al 2 O 3 –B 2 O 3 and chemically stable glasses of good optical quality were produced. The concentration range extends from about 3 to 43 mole % EuO. Room‐temperature Verdet constants as large as –2.55 min/oe‐cm were measured on a glass containing 30.5 mole…
Abstract The temperature dependence of abrasion of various gum and black-filled rubbers on silicon carbide paper is closely similar to the temperature dependence of their energy density at break determined at a high rate of extension. The conclusion is drawn that this type of abrasion is predominantly due to tensile f…
Abstract Four clays were treated with each of eight surfactants at three treatment rates. Volclay and the clay fraction from two montmorillonitic soils were treated with 100, 50, and 10 mmol /100 g.; and kaolinite was treated with 10, 5, and 1 mmol /100g. Adsorption was measured quantitatively by the thermogravimetric…
The permeability to oxygen of 4 wt% lime‐stabilized zirconia and hafnia and of pure thoria was determined between 1100° and 2050°C. The permeability constant (permeability multiplied by the thickness) at 25 torr oxygen pressure is given by: image A 1/4‐power oxygen pressure dependence of the permeability was found for…
Single crystals of γ-LiBO2, which is the phase stable at high (P, T), have been grown at 15 kbar and at 950°C by using a flux technique. The crystals were retained metastably by quenching to room pressure and temperature. γ-LiBO2 is tetragonal with four molecules per unit cell (a=4.1961±0.0004, c=6.5112±0.0007 Å), Spa…
With a new technique of negative staining of sections, it has been possible to observe directly, in ultrathin sections under the electron microscope, the original microcrystalline and microfibrillar structure of cellulose as it occurs in living cells. This method has advantages over the study of isolated fibers used s…
New data on the density of B2O3 from 25° to 230°C are given. A two-state equation of state for the volume is presented which fits the volume data from 350° to 1400°C. A specific structure for the two states is suggested and shown to be consistent with Raman data. Below 350°C and at high pressures the data indicated th…