Materials Literature
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The infrared and resonance Raman spectra of the two long-lived forms of triphenylformazan and several of its derivatives have been examined. The spectra of unsymmetrically 15 N-labelled derivatives suggest that two tautomers exist for each of the two forms. This observation is confirmed by the spectra of 1-(p-halophen…
Abstract The reflectance spectra of orthorhombic GeSe crystals are studied in the region 0.5 to 12 eV in polarized light with E ∥ a and E ∥ b at 290 K and a Kramers‐Kronig analysis is performed. The thermoreflectance spectra are investigated in the region 1 to 5 eV for E ∥ a and E ∥ b at 300 and 90 K. The energy band…
Abstract The influence of ammonium polyphosphate (APP) and hexabromocyclododecane (HBCD) as flame retardant (FR) on poly(acrylonitrile) (PAN) has been examined. The APP–HBCD system behaves as an intumescent flame retardant (IFR) formulation, APP being the char‐forming agent and HBCD the blowing agent. A negligible gas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtein isolates from navy and pinto beans: their uses in macaroni productsAbdelmonem A. Seyam, Orville J. Banasik, and Merlin D. BreenCite this: J. Agric. Food Chem. 1983, 31, 3, 499–502Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Publis…
Under conditions where molecules are forced parallel to the cell surfaces but do not orient themselves along a particular direction, we have observed the unwinding process. The cell thickness dependence of the transition temperature from Sm A to distorted Sm C * or Sm C, T c ( d ), has been obtained. The apparent tilt…
Hall coefficient and resistivity measurements have been made on single-crystal ZnO films prepared by chemical vapor deposition on sapphire substrates from 4.2 K to 300 K. Successive reduction of the film thickness from the surface and the rear (interface to substrate) revealed that there are two regions–a bulk region…
Stress corrosion cracking (SCC) of zirconium Grades 702 (commercially pure zirconium), 704 (a Zr-1.5 Sn alloy), and 705 (a Zr-2.5 Nb alloy) in nitric acid has been studied by constant strain techniques, optical microscopy, scanning electron microscopy, and electrochemical techniques. Zirconium and its alloys, except w…
The ratio weight:volume has been determined for ironwork from four archaeological sites. It is shown how this ratio can be used to determine the presence or absence of metallic iron in a corroded artifact. Experiments show that totally mineralized ironwork generally contains much less chloride than does ironwork retai…
Experiments on initiation of crevice corrosion were carried out on Al specimens in dilute aqueous solutions at ambient temperature. Transient current distributions within crevices were measured by a sectioned electrode technique, and microsampling was used to monitor dissolved aluminum, p H, and [Cl − ] composition ch…
The magnetization of ${\mathrm{Fe}}_{80}{\mathrm{B}}_{20\ensuremath{-}x}{\mathrm{C}}_{x} (0\ensuremath{\le}x\ensuremath{\le}8)$ ferromagnetic metallic glasses has been measured in the temperature range $0<T\ensuremath{\lesssim}180$ K (corresponding to $0<\frac{T}{{T}_{C}}\ensuremath{\lesssim}0.3$) and in magneti…
Theory is discussed for the transverse oscillation of a small circular interface set into a rigid baffle between gas and liquid. The angular resonance frequency is given by (15πT/4ρa3)1/2, in which a is the radius of the interface, T is the interfacial surface tension, and ρ is the density of the liquid. Damping param…
Previous studies on glass formation involving GeO 2 with Bi 2 O 3 , TI 2 O, and PbO were extended by the use of Sb 2 O 3 . Wide areas of glass formation occur in the systems GeO 2 ‐PbO‐Sb 2 O 3 and GeO 2 ‐Bi 2 O 3 ‐Sb 2 O 3 at all but the lowest GeO 2 contents; the region of single‐phase glasses in the system GeO 2 ‐T…
Abstract The Silk fibers of the mulberry ( Bombyx Mori ) were dissolved in a 70% lithium thiocyanate solution. Dissolved silk was regenerated by casting the films from the solution after dialyzing. The films were investigated by infrared (IR) spectroscopy and x‐ray diffraction analysis. It was found that the freshly p…
Depending on the electrode potential an n‐type or a p‐type semiconducting oxide can be present at a Ni electrode surface giving rise respectively, to anodic or cathodic photocurrents under illumination. Impedance measurements show that a solid‐state diffusion process, presumably of protons through the oxide film, domi…
Abstract The mobility of hydrogen in cold‐rolled palladium specimens of different degree of plastic deformation was measured by employing the tritium tracer method. – In one set of experiments the temperature dependence of the diffusivity was determined at very low hydrogen to metal ratios below about 10 −5 . In anoth…
The magnetic anisotropy constants K1 and K2 have been measured for an aligned MnAlC magnet. The information is extracted from magnetization curves with the magnetic field parallel and perpendicular to the alignment axis. The anisotropy field HA =2(K1+2K2)/IS (IS is the saturation magnetization) was determined from a b…
Abstract A calcium‐binding phosphoprotein has been isolated from the extrapallial fluid of clams where it occurs as discrete particles 30–40 nm in diameter at a concentration of 1.5–6.0 mM with respect to organic phosphate. The particles were isolated by nitration and differential centrifugation procedures. In particl…
The dielectric constant tris-sarcosine calcium chloride [${(\mathrm{C}{\mathrm{H}}_{3}\ensuremath{-}\mathrm{N}\mathrm{H}\ensuremath{-}\mathrm{C}{\mathrm{H}}_{2}\ensuremath{-}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H})}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}Ca${\mathrm{Cl}}_{2}$] has been measured with a relative…
A mathematical model for the initiation of crevice corrosion was developed based on the hypothesis that, for Al in , initiation occurs when the concentration of dissolved metal exceeds a certain minimum critical value. This hypothesis was tested experimentally in the preceding qualitative paper. The model accounts for…
The molecular structures of the amorphous films formed on pure aluminium by anodic oxidation in sodium tartrate and phosphoric acid electrolytes, which are known to give quite different oxide morphologies, have been investigated using the technique of electron-yield EXAFS. The Al-0 ‘bond length’ derived from the EXAFS…