Valence Structure of the Higher Borides
An attempt is made to systematize the valence orbital structures of the boron frameworks in MB2, MB4, MB6, MB12, B12C3, and elementary boron.
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Phase equilibria in systems involving the rare-earth oxides. Part I. Polymorphism of the oxides of the trivalent rare-earth ions
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…
KINETICS OF HYDROLYSIS OF POLYETHYLENE TEREPHTHALATE FILMS
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/…
Phase equilibria in systems involving the rare-earth oxides. Part II. Solid state reactions in trivalent rare-earth oxide systems
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…
Magnetic Structure ofMn4N
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…
Mechanical degradation of high polymers
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…
The Thermal Copolymerization of Amino Acids Common to Protein1
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…
Propagation Mechanism of Germanium Dendrites
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 Magnesium-Hydrogen System1-3
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…
SOME PROBLEMS OF THE ELECTRON THEORY OF METALS I. CLASSICAL AND QUANTUM MECHANICS OF ELECTRONS IN METALS
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…
Über Ommochrome, XVIII Modellversuche zur Konstitution der Ommochrome: Die Kondensation von Hydroxy‐chinonen mit o‐Aminophenolen
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…
Über afrikanische Pfeilgifte, XIV. Voruscharin, ein zweites schwefelhaltiges Herzgift aus Calotropis procera L.
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.
The structure and function of the respiratory horns of the eggs of some flies
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…
Response of NaI(Tl) to Energetic Heavy Ions
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 Copper
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…
Slit height corrections in small angle X-ray scattering
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…
SOLID STATE ELECTRONICS
RETURN TO ISSUEPREVAdvertisementNEXTSOLID STATE ELECTRONICSCite this: Chem. Eng. News 1960, 38, 23, 12Publication Date (Print):June 6, 1960Publication History Published online6 November 2010Published inissue 6 June 1960https://doi.org/10.1021/cen-v038n023.p012Copyright © 1960 American Chemical SocietyArticle Views4Alt…
Thermogravimetric and Differential Thermal Analysis of (Ethylenedinitrilo)tetraacetic Acid and Its Derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetric and Differential Thermal Analysis of (Ethylenedinitrilo)tetraacetic Acid and Its DerivativesWesley W. WendlandtCite this: Anal. Chem. 1960, 32, 7, 848–849Publication Date (Print):June 1, 1960Publication History Published online14 July 2003Published inissue…
Crystallinity of potato starch
Summary Methods have been described for the determination of the crystallinity of potato starch, based upon the X‐ray diffraction technique of H ermasns and W eidinger . The crystallinity of air‐dry native potato starch is 21%; that of the moistened, natioe starch is 28%. Air‐dry Lintnerized potato starch is 27% cryst…
Das Resonanzspektrum des Kernspins von Na23 in Einkristallen von Natriumnitrit, NaNO2
An Einkristallen von NaNO 2 wurde bei Zimmertemperatur die Quadrupolkopplungskonstante bestimmt. Es wird ∣ e 2 q Q/h ∣ = 1100,3 ± 0,8 kHz erhalten. Der Asymmetrieparameter η= (φ xx — φ yy )/φ zz ist 0,1092 ± 0,0009. Die Hauptachsen des Quadrupolkopplungstensors fallen mit den orthorhombischen Kristallachsen zusammen,…