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The thermal conductivity of a single crystal of Ge and a polycrystalline specimen of Si have been measured in the range 2 to 100°k. Both specimens were very pure. The results indicate that, at low temperatures at least, the lattice waves are not scattered by the conduction electrons, but that their mean free path is l…
The thermal conductivity of Tic, Sic, TiN, and ZrN has been measured in the temperature range 100° to 1000°C. The thermal conductivity of these materials decreases with increasing temperature. Determination of the Wiedemann‐ Franz ratio indicates that electronic conduction is considerable for TIC, TiN, and ZrN but is…
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A study of hard materials in an effort to find possible substitutes for industrial diamonds led to research on hafnium carbide. This compound was prepared from a mixture of hafnium dioxide and lampblack in a carbon resistance furnace by solid‐state reaction or from a melt. Some factors affecting the combined carbon co…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTO3-MONOACETYLMORPHINELLEWELLYN H. WELSHCite this: J. Org. Chem. 1954, 19, 9, 1409–1415Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/jo01374a001https://doi.org/10.1021/jo0…
In the evaillation of mall Y methods of test, t h e t \\'O usual cri tena-precision and aCCl!racy-are inwmcient.Accuracy is only applica ble wh ere compari sons with a standard can be made.Pr ec i ~ion, when interpreted as d egree of r ep roducibiltty, is ]Jot necessarily a measu r e of merit, becallse a me thod may b…
Cotton Cellulose 1, 2, 3, 4 Buthanetetracarboxylic Acid (BTCA) Crosslinking Monitored by some Physical—chemical Methods
X-ray measurements on NiOAl2O3, MnOAl2O3, and CoOAl2O3 show that the Ni spinel is almost completely inverted, the Mn partially so, and the Co compound almost completely normal. This information combined with the magnetic susceptibility vs temperature data yields a g-value of approximately 4.0 for both tetrahedrally co…
Es werden die Grundzüge einer Theorie der Kristallplastizität gegeben, die in wesentlichen Punkten von den bisherigen Theorien abweicht. Die kritische Schubspannung wird nicht, wie üblich, als kritische Länge von Frank-Read-Quellen, sondern als Wirkung der Spannungsfelder der im Kristall als Netzwerk vorhandenen Verse…
The temperature dependence of the minimum sound pressure needed to produce cavitation in gassy water has been measured over a range of 0 to 30°C. Both plane progressive and focused waves of frequency one megacycle per second were used. The cavitation pressure threshold Pc is not a linear function of temperature, and i…
In order to investigate twinning dislocations of metals, a simple crystallographical calculation is done, assuming that atomic movements are periodic as the twinning plane moves, that there is no diffusion, and that atoms come to new twin lattice sites from the most neighbouring original lattice sites of them. The she…
The time-dependent diffusion equation is solved using transformation calculus to obtain the solute concentration in a solvent after a segregating liquid-solid interface is passed through the material. The results are presented in graphical and tabular form for typical experimental conditions and compared with previous…
The O—H bending and N—O stretching vibrations were studied in four pairs of isomeric oximes. A band at 1265 cm. −1 , characteristic of the solution spectra of the α oximes, is identified with the O—H bending mode. Tentative assignments for the N—O stretching vibration both in solid and solution spectra are advanced. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Isonicotinic Acid Hydrazide1L. H. JensenCite this: J. Am. Chem. Soc. 1954, 76, 18, 4663–4667Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/ja0…
Abstract Die Phasenverhältnisse der Ceroxyde zwischen CeO 2 und Ce 2 O 3 und der Praseodymoxyde zwischen PrO 2 und Pr 2 O 3 werden durch Röntgenuntersuchungen bestimmt. Beide Oxydsysteme erweisen sich in der Zahl der beobachteten drei Phasen als völlig übereinstimmend und hinsichtlich der Ausdehnung dieser Phasen als…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacro-ions. IV. The Ionic Strength Dependence of the Molecular Properties of Sodium CarboxymethylcelluloseNathaniel S. Schneider and Paul DotyCite this: J. Phys. Chem. 1954, 58, 9, 762–769Publication Date (Print):September 1, 1954Publication History Published online1 May 200…
ABSTRACT Analyses have been made of the inorganic constituents of the blood of Mytilus edulis and Anodonta cygnea. Mytilus blood resembles sea water in total concentration and composition, but has greater concentrations of calcium, potassium and total carbon dioxide. Anodonta blood has a very low total concentration o…
Samples have been cut from single crystals of the nickel-iron ferrite (NiO)0.75(FeO0.25Fe2O3in such a way that they contain one and only one movable ferromagnetic domain wall. The viscous damping coefficient for this wall, which is a measure of the losses associated with domain wall motion in this material, has been m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPOLYPEPTIDES. II. THE CONFIGURATION OF POLYMERS OF γ-BENZYL-L-GLUTAMATE IN SOLUTION1Paul Doty, A. M. Holtzer, J. H. Bradbury, and E. R. BloutCite this: J. Am. Chem. Soc. 1954, 76, 17, 4493–4494Publication Date (Print):September 1, 1954Publication History Published online1 Ma…
Measurements of the coefficient of restitution have been made for the impact of steel balls on plates of glass and plastics. The times of contact have also been measured. The coefficient of restitution is found to be a function of the size of the specimen as well as of its elastic and anelastic properties. The variati…