Materials Literature
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The $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\beta}$, $\ensuremath{\beta}\ensuremath{-}\ensuremath{\gamma}$ and the direct $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\gamma}$ phase transformations in uranium have been studied up to 45 kbar at cooling and heating rates of 3-5\ifmmode^\circ\else\textdegree\fi{}C…
Detailed calculations of the relaxational behavior of the central resonance line corresponding to transitions between levels $m=\ifmmode\pm\else\textpm\fi{}\frac{1}{2}$ have been made for $I=\frac{7}{2}$ and $I=\frac{9}{2}$ in noncubic or imperfect cubic crystals. The behavior of the central line depends on the relati…
Theoretical calculations are given for the electrical conductivity of graphite in the hexagonal layer planes. The resistivity increases with temperatures as T 1.2 between 25°K and 77°K. In the long wave-length limit, the lattice vibrations of graphite are approximatly grouped into two modes, polarization being in the…
peer reviewed
-benzoquinone, rhodizonic acid, triquinoyl (cyclohexanehexone), croconic acid, and leuconic acid (cyclopentanepentone). Certain derivatives and color tests, as well as infrared and ultraviolet spectra, are reported for their identification.
Abstract Aus Glühdrahtexperimenten, bei denen blanke sowie mit RuO 2 bedeckte Ru‐Drähte in O 2 N 2 ‐Atmosphäre erhitzt wurden, konnte abgeleitet werden, daß die Verflüchtigung des Rutheniums bei Temperaturen ≧ 1200°C im wesentlichen als RuO 3 erfolgt. Mitührungsmessungen bestätigten dieses Ergebnis. Sie zeigten ferne…
Abstract Examination of 325 bottom samples taken at 68 stations off the SE. coast of the U. S. by the U. S. Fish and Wildlife Service revealed the common occurrence of glauconite in foraminiferal sands. The glauconite is variable in color and in morphology, ranging from dark greenish-black to greenish-white. The dark…
Summary The reactions of variscite, AlPO 4 ·2H 2 O, and of strengite, FePO 4 ·2H 2 O, with dilute aqueous solutions have been investigated. Particular attention has been given to the effects of time of reaction, pH of solution, and the solution/solid ratio. Thermodynamic solubility constants are maintained only at low…
Abstract A new crystalline form of polyoxymethylene is described with an orthorhombic unit cell, space group P 2 1 2 1 2 1 , and lattice constants a = 4.77 A., b = 7.65 A., c = 3.56 A. The chains are helicoidal with the axis of the helix parallel to c . The period of identity of 3.56 A. comprises two monomeric units a…
Abstract Polymorphism present in the even nylons has been accounted for in terms of parallel and antiparallel packing of the polyamide chains. Hydrogen bonding appears to play the most important part in governing chain packing. For example, in the antiparallel structure (alternate chains running in opposite directions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation States of Manganese Hematoporphyrin IX in Aqueous Solution*Paul A. Loach and Melvin CalvinCite this: Biochemistry 1963, 2, 2, 361–371Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March 1963https://pubs.acs.o…
Abstract Mica‐type layer‐silicates such as montmorillonite and vermiculite are capable of exchanging their cations for other (including organic) cations, just like the zeolites. These derivatives swell in a variety of liquids. This paper presents a survey of the structures of organic derivatives of mica‐type layer‐sil…
Vibrational distribution functions are derived for a number of rocksalt-structure alkali halides using a more refined treatment of the interionic forces than that provided by regarding them as rigid point charges. The dipole moment at any given ion site is calculated taking into account the contribution from the defor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTRIMETHYLALUMINUM: THERMODYNAMIC FUNCTIONS IN THE SOLID AND LIQUID STATES, 0-380°K.; VAPOR PRESSURE, HEAT OF VAPORIZATION, AND ENTROPY IN THE IDEAL GAS STATE1J. P. McCullough, J. F. Messerly, R. T. Moore, and S. S. ToddCite this: J. Phys. Chem. 1963, 67, 3, 677–679Publicatio…
Abstract The rate of permeation of hydrogen through a highly purified iron (Ferrovac E) was measured over a pressure range of 1/30 to 300 atm. and a temperature range of 126° to 693°C. The effect of cold working of the annealed metal and of hydrogen purity were also studied. Permeability, diffusivity, and solubility w…
The yield of secondary electrons ${\ensuremath{\gamma}}_{n}$, from cleaned surfaces of polycrystalline molybdenum has been measured for argon neutral atoms (${\mathrm{Ar}}^{0}$) in the energy range 500-2500 eV. The values of ${\ensuremath{\gamma}}_{n}$ thus obtained are compared with ${\ensuremath{\gamma}}_{i}$, the y…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHERMOPHYSICAL PROPERTIES OF THE LANTHANIDE OXIDES. III. HEAT CAPACITIES, THERMODYNAMIC PROPERTIES, AND SOME ENERGY LEVELS OF DYSPROSIUM(III), HOLMIUM(III), AND ERBIUM(III) OXIDES1Edgar F. Westrum Jr. and Bruce H. JusticeCite this: J. Phys. Chem. 1963, 67, 3, 659–665Publicat…
X-ray- and uv-excited thermoluminescence in natural quartz has been investigated by studying the properties of synthetic samples. The results for a large number of natural samples, including single crystals, outcrop specimens, and core-hole samples showed that most of them had four prominent glow peaks in common. One…
Evidence is presented which suggests that the true gel phase in natural rubber is composed of small crosslinked latex particles (microgel), whose presence is revealed by light scattering and by electron microscopy. These are combined into a matrix with soluble rubber molecules, forming the apparent gel phase. The rate…
Goldstein, Solomon. (Brooklyn Coll., Brooklyn, N.Y.) Development and nutrition of new species of Thraustochytrium. Amer. Jcur. Bot. 50(3): 271‐279. Illus. 1963.—The life cycles of 2 lower Phycomycetes in sea‐water‐pollen culture are described and compared with variations observed in nutrient media. Some ecological imp…