Materials Literature
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A method is described for the determination of possible space groups for pseudosymmetric structures, i.e. structures derived from an idealised structure of higher symmetry by small displacements of the atoms from special positions. Conventionally, systematic absences are used to infer the presence of symmetry operator…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperiments with 4-Thiopyrones and with 2,2',6,6'-Tetraphenyl-4,4'-dipyrylene. The Piezochromism of DiflavyleneAlexander Schönberg, Mohamed Elkaschef, Michael Nosseir, and Mahmoud Mohamed SidkyCite this: J. Am. Chem. Soc. 1958, 80, 23, 6312–6315Publication Date (Print):Decem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effects of Molecular Weight on the Crystallinity of PolyethyleneL. J. Tung and S. BuckserCite this: J. Phys. Chem. 1958, 62, 12, 1530–1534Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.…
A relaxation method is used to adjust the thicknesses of the films of a multilayer in order to alter its transmission characteristics in a limited spectral region. This method is used to modify the spectral transmission of a short-wavelength pass multilayer and a broad-band dielectric mirror. The computations also fur…
It was known that solubility of irradiated polymers was not free from the effect of cyclization. On the contrary, viscosity before gel point is not affected by it and it is utilized in order to investigate the effects of high energy radiation on polymers. Intrinsic viscosity is discussed first for the case where cross…
Abstract The calcination of calcium hydroxide and of calcium carbonate (precipitated or prepared from calcium oxalate monohydrate) has been studied by determining the changes occurring in the specific surface and lattice structure during each decomposition in vacuo or in air at a series of temperatures up to 900° or 1…
The solubility and solution rates of porous glass and silica gel in nitric acid solutions at 95°, 65°, and 36° C. were determined. The solubility depends on the acid concentration, decreasing with increasing strength of free HNO 3 in accordance with the following equation: log C = ‐aN ‐ b , where C is the silica solub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectra and Strain in Cyclic Carbonyl CompoundsH. K. Hall Jr. and R. ZbindenCite this: J. Am. Chem. Soc. 1958, 80, 23, 6428–6432Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.o…
Using neutron diffraction data, the crystal structure of gypsum has been refined by Fourier and least squares methods. The hydrogen bond distance was found to be 2.82 A rather than 2.71 A, reported previously. The hydrogen positions are consistent with those obtained from nuclear magnetic resonance. The O–H distance i…
The nonequilibrium limit of random crystallization of linear high polymers is described in this article. Expressions for crystallite size, surface area, crystallinity, and amorphous sequence distribution of crystallizable repeating units in random copolymers after cold crystallization are derived. Melting points and c…
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A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom. The conditions necessary for formation, structure, stability and therma…
Abstract An attractive force appears between particles suspended in solutions of macromolecules when there is neither direct interaction between two particles nor energetic interaction between particles and solute macromolecules. The magnitude of this force is of the order of the osmotic pressure of the solution of ma…
Abstract Mit Ameisensäure als Kohlenoxydquelle können ohne Druckapparatur zahlreiche verzweigte Carbonsäuren aus Olefinen, Alkoholen, Alkylchloriden oder Estern in guten Ausbeuten hergestellt werden. Die Umsetzung, die in Gegenwart von konz. Schwefelsäure stattfindet, führt bevorzugt zu tertiären Säuren, z. B. Trimeth…
Descriptions of three heavy metal stains and methods of application to tissue sections for electron microscopy are presented. Lead hydroxide stains rather selectively two types of particles in liver: those associated with the endoplasmic reticulum and containing ribonucleic acid and other somewhat larger particles. Ba…
The cross section for elastic scattering of electrons of less than 10-ev energy by free hydrogen atoms has been measured. The experimental approach was similar to that used by Bederson, Malamud, and Hammer in that a dc electron beam crossed an atomic hydrogen beam, which was chopped at a low frequency, and the signal…