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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation between porphyrins and metal ionsB. F. Burnham and J. J. ZuckermanCite this: J. Am. Chem. Soc. 1970, 92, 6, 1547–1550Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/1…
The last decade has featured major advancesin the technology and chemistry of urethane rigidfoams. Facile processing characteristics combined with unique physical properties-some still not yetfully explored-continue to create novel applica-tions, the latest being their use for the manufacture of chair shells (1). The…
Specimen contamination during electron-optical examination has been studied using “holey’ carbon-film specimens in a modified electron microscope. The composition of the residual gas atmosphere was determined by mass-spectrometric analysis. The gas pressure in the vicinity of the specimen was reduced to between 10−5 a…
Abstract Paramagnetic species produced in polycarbonate (PC) by γ‐ or ultraviolet irradiation were investigated by ESR. In γ‐irradiation, scissions of carbonate groups in the main chain occur. ESR spectra ( g = 2.003 4 ) composed of a sharp singlet, some broad singlets, and a small signal with hyperfine structure are…
The optical constants of the Eu chalcogenides between 1 and 6 eV have been obtained by means of a reflection technique for single crystals and transmission measurements for evaporated thin films. The films have been cooled below the magnetic transition temperature and the transmission was measured with linearly and ci…
GdN is shown to be ferromagnetic but small amounts of oxygen (GdN1−xOx with x≈0.05) cause paramagnetism and short-range antiferromagnetic order to set in. We attribute this to nearest-neighbor interactions having opposite sign.
The limiting oxygen index (LOI) technique provides a quantitative measure of reduced ftammability for fabrics over broad ranges of chemical treatment. Several conventional flame-retardant finishes for cellulosics gave linear LOI relationships with phosphorus content when compared at fixed nitrogen/phosphorus ratios. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBistriphenylsilyl chromate. Oxidation of olefins and use in ethylene polymerizationLeonard Morton Baker and Wayne L. CarrickCite this: J. Org. Chem. 1970, 35, 3, 774–776Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 Ma…
The infrared-active vibrations of the TCNQ molecular structure have been investigated by using the spectra of the powder and those of the (001) and (010) crystal planes in polarized radiation for both TCNQ and its fully deuterated analog. These measurements give most of the significant indications which can be drawn f…
The article gives a general treatment of the electron optical properties of cylindrical electron spectrographs. The resolution, the transmission, and the ratio of them (figure of merit) for electrostatic spectrographs are computed and compared for various choices of focusing arrangement and location of the source and…
Abstract The corrosion resistance of materials employed for surgical applications was dertermined and compared by means of potentiostatic anodic polarization techniques. In a physiological saline solution the passive breakdown potential of stainless steel materials was dependent upon the oxygen content opf the solutio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of thermal decomposition of n-butyl(tri-n-butylphosphine) copper(I)George M. Whitesides, Erwin R. Stedronsky, Charles P. Casey, and Joseph San Filippo Jr.Cite this: J. Am. Chem. Soc. 1970, 92, 5, 1426–1427Publication Date (Print):March 1, 1970Publication History Pu…
Particle length and the influence of various factors on the particle length of F-actin polymerized in Vitro were investigated in detail by electron microscopy. The length distribution of F-actin was found to be very heterogeneous; e.g. te number- average length (〈L〉n) was abut 1.5μ, the weight-average length (〈L〉w) wa…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Victor A. Bloomfield; Free Volume in a One‐Dimensional Liquid. J. Chem. Phys. 1 March 1970; 52 (5…
The lattice parameters of ammonium chloride have been measured at 31.5 and 54.0°C. The coefficient of linear expansion is found to be 58.5 × 10 −6 °C −1 .
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser Radiation-Induced, Residue-Free, Localized Decomposition of Some PlasticsLeo Parts, Edgar E. Hardy, and Margaret L. RodenburgCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 21–26Publication Date (Print):March 1, 1970Publication History Published online1 May 2002…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Fluorescence from the lowest spin orbital component of the 3T2 manifold of Ni ions in MnF2 is observed to terminate on the ground state 3A2 of the Ni with excitation of 0, 1, and 2 spin deviations centered on the nickel ion and corresponding, respectively, to the crystal ground state (G), and excitation of the s0 and…
The high-frequency permeability of partially magnetized ferrites is calculated for some simple domain configurations, comprising only ``up''- and ``down''-domains. The method used is based upon the magnetostatic approximation and neglects exchange effects, but is otherwise substantially rigorous. The components of the…
Summary Wardite, NaAl 3 (OH) 4 (PO 4 ) 2 . 2H 2 O, has a = 7·03 Å, c = 19·04 Å; space group P 4 1 2 1 2 or P 4 3 2 1 2. Its crystal structure was solved by a three-dimensional Patterson function computed using intensity data photographically collected by the Weissenberg method, and refined by successive Fourier maps a…