The Structure of the OH Source in W3
Interferometric study of OH emission source in W3 /IC 1795/ region, processing data on digital computer
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Reactions catalyzed by minerals. Part III. The mechanism of spontaneous interlamellar polymerizations in aluminosilicates
Abstract The spontaneous polymerization of hydroxymethacrylate monomers by the layer aluminosilicate montmorillonite is reported. Saturation of montmorillonite by acrylic monomers gives interlayer complexes of three types, only one of which is susceptible to spontaneous polymerization. Electron‐donating sites situated…
Dielectric Relaxation Mechanism in NaNO2
The dielectric relaxation in NaNO 2 is analyzed on the basis of the time dependent statistics of the Ising system, where the Ising variable corresponds to two stable orientations of the polarization carried by each molecular unit. The dynamical susceptibility is calculated with the random phase approximation in terms…
Electronic Raman Effect. II. Asymmetry of the Scattering Tensor for Electronic Raman Transitions
The theory of electronic Raman scattering for trivalent rare-earth ions in crystals is formulated in a general way. It is shown that vibronic coupling is unimportant. The antisymmetric part of the scattering tensor, which vanishes for vibrational Raman scattering, turns out to be dominant for several electronic Raman…
Occurrence of Poly-β-Hydroxybutyrate in the Azotobacteriaceae
Poly-beta-hydroxybutyrate (PHB) from various representative strains of the genera Azotobacter, Beijerinckia, and Derxia was isolated and characterized. During growth in shake culture, with glucose as a carbon and energy source, and molecular nitrogen as a nitrogen source, increase in dry weight appeared linear, and PH…
Kinetics of the reaction of cobalt(III) and iron(III) hematoporphyrin with cyanide and thiocyanate. Evidence for a dissociative mechanism
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the reaction of cobalt(III) and iron(III) hematoporphyrin with cyanide and thiocyanate. Evidence for a dissociative mechanismEverly B. Fleischer, Simone Jacobs, and Louis MestichelliCite this: J. Am. Chem. Soc. 1968, 90, 10, 2527–2531Publication Date (Print):May…
Proton magnetic resonance spectra of pentofuranose derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance spectra of pentofuranose derivativesJohn D. Stevens and Hewitt G. Fletcher Jr.Cite this: J. Org. Chem. 1968, 33, 5, 1799–1805Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.a…
A method of absorption correction by X-ray intensity measurements
The theoretical and experimental principles of a method are described, which permits an approximate evaluation of the absorption correction by intensity measurements with the aid of a four-circle diffractometer.
Critical temperature and coexistence curve for aluminum bromide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical temperature and coexistence curve for aluminum bromideJ. W. Johnson, W. J. Silva, and Daniel CubicciottiCite this: J. Phys. Chem. 1968, 72, 5, 1664–1668Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968http…
Concentration Quenching of Nd^3+ Fluorescence
Concentration quenching of the 1.06-micro Nd(3+) fluorescence in glass is investigated to help determine the nature of the Nd(3+)-Nd(3+) interaction that causes quenching. The relative fluorescent efficiency vs Nd(3+) concentration is measured for thin, polished plates of glass in an apparatus designed to minimize ins…
Glass Transition Temperature of Nylon 6
Studies of nylon 6 of various relative lengths have been made by measuring the sonic modulus and length as functions of temperature from -50°C to 180°C. Conclusions based on these data indicate that the transition of dry nylon 6 yarn from a glass to rubberlike material takes place in two discrete steps, one centering…
Anisotropy in the Electrical Resistivity of Vanadium Dioxide Single Crystals
Electrical resistivity of vanadium dioxide single crystals undoped and iron-doped was determined as a function of temperature around the transition temperature in the a monoclinic and a perpendicular directions. Results of this experiment indicated a greater resistivity in the a perpendicular direction than in the a p…
The solution of lithium in hexagonal potassium tungsten bronze
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe solution of lithium in hexagonal potassium tungsten bronzeEphraim Banks and Amnon GoldsteinCite this: Inorg. Chem. 1968, 7, 5, 966–969Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10…
X-ray determination of thermal expansion of zinc oxide
Lattice parameters of zinc oxide have been determined accurately at different temperatures between 27°C and 619°C. These data have been processed to evaluate the temperature variation of the coefficients of thermal expansion αa and αc and the results could be represented as follows: αa = 6.05 × 10−6 + 2.20 × 10−9t + 2…
On the information about deformations of the atoms in X-ray diffraction data
The information which can be obtained about the shape of crystal atoms by X-ray diffraction is studied in light of a model calculation. The electron density of an atom is treated as a Fourier invariant expansion in terms of harmonic oscillator wavefunctions adapted to the crystal symmetry. Definite limits for the obse…
Thermal and photo‐oxidation of polysulfone
Abstract Prolonged heating at temperatures below 140°C. causes only slight changes in the properties of polysulfone. Exposure to ultraviolet light, however, results in substantial changes as evidenced by broad absorption in both the hydroxyl and carbonyl regions of the infrared spectrum, evolution of carbon monoxide a…
Studies on chitan (β-(1 → 4)-linked 2-acetamido-2-deoxy- D -glucan) fibers of the diatom Thalassiosira fluviatilis , Hustedt. III. The structure of chitan from x-ray diffraction and electron microscope observations
The form and crystal structure of the fibers attached to the diatom Thalassiosira fluviatilis were studied by the electron microscope and x-ray diffraction.These fibers, which were shown previously to be pure, highly crystalline β-(1 → 4) linked poly-N-acetyl-D-glucosamine (chitan), are strap-like in cross section, 10…
Radiation Heat Transfer
"Radiation Heat Transfer." Nuclear Science and Engineering, 32(2), pp. 280–281
Surface treatment of polymers. II. Effectiveness of fluorination as a surface treatment for polyethylene
Abstract An effective surface treatment for adhesive bonding of polyethylene has been developed. It involves exposing the polymer to an environment of elemental fluorine or fluorine diluted in argon. By this treatment, extensive fluorination of the surface region is effected. The fluorinated surface permits formation…
Thermodynamics of Mixing Polymethylene and Polyisobutylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Mixing Polymethylene and PolyisobutyleneP. J. Flory, B. E. Eichinger, and R. A. OrwollCite this: Macromolecules 1968, 1, 3, 287–288Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs…