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Vibrational frequency distributions for the potassium and rubidium halides and for cesium fluoride have been evaluated on the basis of the Born lattice theory by the use of Blackman's numerical sampling method. Both room-temperature and extrapolated 0°K parameters have been used in the calculation. Specific heats, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContribution to the Structure of the Ferrichrome Compounds: Characterization of the Acyl Moieties of the Hydroxamate Functions1,2Thomas Emery and J. B. NeilandsCite this: J. Am. Chem. Soc. 1960, 82, 14, 3658–3662Publication Date (Print):July 1, 1960Publication History Publis…
Abstract The ringed structure in polyethylene spherulites was investigated by an x‐ray microdiffraction method. A spherulite with extinction rings whose interval is about 50 μ was observed when viewed under the polarization microscope. An asymmetric x‐ray diffraction fibrous pattern about the b axis was obtained for t…
Abstract Polyvinyl chloride deteriorates primarily by a zipperlike elimination of hydrogen chloride from the polymer and the concomitant formation of a colored and easily ozidizable polyene chain. Baum and Wartman have shown that the elimination is initiated by the rupture of certain especially labile carbon‐chlorine…
An attempt is made to systematize the valence orbital structures of the boron frameworks in MB2, MB4, MB6, MB12, B12C3, and elementary boron.
Th e polymorphi c relatioll ships of t he pure rare-carlh oxides have been r ei nves tigated us ing X-ray diffrac tion methods for ident ificat ion of phases. The ox ides of the t rivalen t rare eart h ions crystalli ze in t hree different typ es: A rt B, and C. Each oXIde has o nly one t ruly stab le polymorph: La203…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKINETICS OF HYDROLYSIS OF POLYETHYLENE TEREPHTHALATE FILMSR. C. Golike and S. W. Lasoski Jr.Cite this: J. Phys. Chem. 1960, 64, 7, 895–898Publication Date (Print):July 1, 1960Publication History Published online1 May 2002Published inissue 1 July 1960https://pubs.acs.org/doi/…
Selected mixtures in 21 binary and 9 ternary rare-earth oxide systems were studied by X-ray diffraction after heat treatment at 1,650° C and above. Two graphs were drawn to show specific regions of stability for the various structure types. Each gives the average ionic radius of constituent cations versus the mole per…
The magnetic structure of ${\mathrm{Mn}}_{4}$N has been determined by neutron diffraction from powders. The cubic unit cell has Mn at the corner and face centers and N at the body center. Standard diffraction techniques led to four possible models and it was necessary to perform polarized neutron beam experiments to r…
Abstract A theory for the shear degradation of high polymers is presented. It assumes the molecules to exist in the rubbery or liquid state and does not include the effects of chemical reactions which might occur subsequent to chain rupture. The computation shows that the entanglements along the chains play a major pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Copolymerization of Amino Acids Common to Protein1Sidney W. Fox and Kaoru HaradaCite this: J. Am. Chem. Soc. 1960, 82, 14, 3745–3751Publication Date (Print):July 1, 1960Publication History Published online1 May 2002Published inissue 1 July 1960https://pubs.acs.or…
The role of the twin planes in the rapid dendritic propagation of germanium crystals is examined on the basis of corner nucleation. A model is proposed, and it is shown that at least two twin planes must be present for continued easy propagation in <211> directions, in good agreement with experimental ob…
The motivating factor for this investigation of the magnesium-hydrogen system was the recent interest in the hydride of beryllium. Although beryllium hydride has been prepared by the pyrolysis of di-t-butylberyllium, no evidence for the direct union of beryllium and hydrogen has been reported. It was thought that an e…
1. Introduction 831 2. Geometry of Constant-Energy Surfaces for Electrons 833 3. Classical Mechanics of a Particle with an Arbitrary Dispersion Law 835 4. Collisions of Quasiparticles. Scattering 841 5. Quasiclassical Energy Levels 843 6. Quantum Mechanics of an Electron with an Arbitrary Dispersion Law 848 7. Quantum…
Abstract 2‐Hydroxy‐naphthochinon‐(1.4) bzw. 4.6‐Dihydroxy‐chinolinchinon‐(5.8) werden mit verschieden substituierten o ‐Aminophenolen zu Phenoxazonen kondensiert. Die Ausbeuten an Phenoxazonen werden vom Molverhältnis der Komponenten und der Basizität der o ‐Aminophenole bestimmt. o ‐Hydroxy‐anilino‐naphthochinone sin…
Abstract Durch eine auf CN‐Doppelbindungen abgestimmte Reduktion sowie durch Spaltung und Teilsynthese (aus Uscharidin und Cysteamin) wird gezeigt, daß das „Voruscharin”︁ ein Thiazolidinderivat ist, das sich mit einer offenen Thiolform im Gleichgewicht befindet.
Abstract Eggs of flies of the families Sepsidae, Drosophilidae, Sphaeroceridae, Muscidae, and Cordiluridae may have one or more tubular or flattened projections from the anterior part of the shell. These projections are called respiratory horns. The eggs are laid in decomposing vegetable or animal matter. The respirat…
The light output of NaI(Tl) was measured as a function of energy for ions of ${\mathrm{He}}^{4}$, ${\mathrm{B}}^{10}$, ${\mathrm{B}}^{11}$, ${\mathrm{C}}^{12}$, ${\mathrm{N}}^{14}$, ${\mathrm{O}}^{16}$, ${\mathrm{F}}^{19}$, and ${\mathrm{Ne}}^{20}$ from approximately 1.0 to 10.0 Mev/nucleon. The particle energy was va…
Optical properties of solid copper have been measured in a wavelength range from 0.365 to 2.5 microns and at temperatures 90\ifmmode^\circ\else\textdegree\fi{}, 300\ifmmode^\circ\else\textdegree\fi{}, and 500\ifmmode^\circ\else\textdegree\fi{}K. Annealed and electropolished specimens were used. Measurements were done…
A method of correcting experimental small angle x-ray scattering curves for the effects of the height of the collimating slits is developed. The method has the advantage of eliminating the need for numerical differentiation of the experimental curve. An expression suitable for numerical calculation is given, and an an…