Materials Literature
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Thallium‐probe ion luminescence spectroscopy and X‐ray photoelectron spectroscopy were used to study the structure of sodium aluminosilicate glasses. It was demonstrated that the O1s spectral envelope for these glasses is comprised of three energetically distinct peaks, two attributed to bridging oxygen atoms (Si‐O‐Si…
Abstract Small-angle X-ray powder diffraction analyses and high-resolution electron microscopy of allophane samples (SiO 2 /Al 2 O 3 ratio, 1.12 to 1.68) showed that allophanes consist of nearly identical spherical particles with diameters of about 40 Å and retain their characteristic “hollow” spherical morphology at…
Abstract Ac impedance investigations were performed at high‐purity iron and mild steel in de‐aerated 10% hydrochloric acid under free corrosion at room temperature in the presence of quaternary ammonium compounds. Systematic studies of specially selected and synthesized pyridinium and quinolinium derivatives revealed…
This paper describes the adaptation of Rouard’s method, a familiar computational technique used in thin-film coating design, to the analysis of waveguide diffraction gratings. The approach can be used to generate the spectral and the angular characteristics of arbitrary straight-line gratings (periodic or nonperiodic)…
A code written in BASIC is described which calculates x-ray spectra for tube voltages from 20 to 150 kVDC. Data for the spectral distribution, the mean photon energy, kerma in air, mean energy of the kerma distribution together with 1. and 2. half-value layers for aluminum are obtained. Numerical values for the differ…
The MLCT (Metal to Ligand Charge Transfer) excited state of the Ru(bipyrazine)3(2+) is quenched by a series of organic amines and methoxybenzenes, in acetontrile solution. Linear Stern-Volmer plots were obtained, and various rate parameters were extracted from the data. The excited state is also quenced in neutral aqu…
Our identification of a family of genetically distinct collagens specifically distributed in the connective tissue of muscle now poses questions on their possible role in myoblast differentiation, muscle development, turnover and function in the living muscle, and post-rigor in the tenderness of meat. Using collagen-t…
Four nickel-bearing clay minerals from New-Caledonia belonging to the lizardite-nepouite and the kerolite-pimelite series have been investigated in order to study the mechanisms of Ni-Mg substitution. Local order around Ni was determined by optical absorption spectroscopy and X-ray absorption spectroscopy at the Ni-K…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox intercalation reactions of vanadium oxide phosphate dihydrate (VOPO4.2H2O) with mono- and divalent cationsA. J. Jacobson, Jack W. Johnson, J. F. Brody, J. C. Scanlon, and J. T. LewandowskiCite this: Inorg. Chem. 1985, 24, 12, 1782–1787Publication Date (Print):June 1, 1…
Species of the genus Thalassiosira are abundant in the oceanic waters south of the Antarctic Convergence Zone. Species within the genus are differentiated on the basis of arrangement and density of areolae and on type, position, and arrangement of processes. All of the Antarctic species known to us can be separated on…
X-ray photoelectron spectroscopy spectra measured on copper sulfide (CuxS) films showed that a thin surface reaction product containing Cu in the +2 valence state was formed on CuxS films exposed to air for 46 h at 40 °C and 90% relative humidity. An entirely different CuxS surface reaction product layer was formed in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWell-controlled polymerization by metalloporphyrin. Synthesis of copolymer with alternating sequence and regulated molecular weight from cyclic acid anhydride and epoxide catalyzed by the system of aluminum porphyrin coupled with quaternary organic saltTakuzo Aida, Koichi Sa…
The currents flowing from a localized corrosion site (LCS) on passive stainless steel in air‐saturated have been studied using a vibrating probe electrode. The potential behavior during applied currents was analyzed by assigning equivalent circuits to the passive surface and the localized site so that the paths of the…
Abstract Differential scanning calorimetry was used on a range of synthesized phenol–formaldehyde (PF) resols to discover relationships between formulation parameters or physical properties of resols, and their thermal behavior during cure. The thermograms showed either one or two exothermic reactions. The lower exoth…
Excitation coefficients for the production of vibrationally exicted D2 by low energy electrons have been determined from measurements of the intensity of infrared emission from mixtures of D2 and small concentrations of CO2 or CO. The measurements were made using the electron drift tube technique and covered electric…
The effect of lateral substituents on the type and thermodynamic stability of the mesophases shown by terminally polar and nonpolar rod-like mesogens is described. Lateral substituents both sterically force the interacting molecules apart and also hinder the packing of the molecules in a layered structure, thus suppre…
The nebulosities around five optically selected (by UV excess) luminous QSOs have been observed spectroscopically. 3C 273, which has been observed off-nucleus before, has nebulosity dominated by a stellar continuum. TON 202, a steep-spectrum radio source, has nebulosity dominated by strong Balmer and [O III] emission…
Abstract A range of authigenic sedimentary chlorites from sandstones has been studied by analytical transmission electron microscopy. Selected area (single crystal) electron diffraction patterns are of the I b ( β = 90°) polytype confirming the earlier observations of Hayes (1970). TEM analyses show all samples to be…
The crystal structure of cubic barium titanate was determined at five temperatures up to 180 °C, using the data collected by an X-ray automatic four-circle diffractometer. At temperatures between the Curie temperature and about 180 °C, the Ti atom is displaced from the center of the unit cell along the <111> direction…
The addition of small amounts of iron to the shape-memory alloy Ti-Ni suppresses the martensitic transition, permitting a detailed study of ``premartensitic'' effects. Using x-ray and neutron-diffraction data, specific-heat, resistivity, and susceptibility measurements, we show that two distinct phases appear. The fir…