Materials Literature
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<div class="htmlview paragraph">The basic working principles and the different types of multifunctional catalysts for “three way systems” are reviewed. Test methods for multifunctional catalysts characterizing activity and stability are described. Ageing procedures in air may cause problems with rhodium containi…
From analysis of published data for a number of alloys, it is shown that dislocation bowing during deformation in overaged and dispersion-hardened alloys depends to a large extent on the relative shear moduli of the obstacles and the matrix, although other factors such as particle size, the nature of the particle/matr…
<div class="htmlview paragraph">THE USE OF Rh/Pt catalysts in automobile exhaust emission control is now well established. These catalysts are applicable in both the conventional CO/HC control system and the more novel TWC approach seeking to control CO, HC and NOx emissions simultaneously. During comparative in…
Abstract The examination of treating oven pollutant effects on the adhesion of RFL‐coated polyester and nylon tire cord to rubber was conducted using a hot strip adhesion test. Ozone, ultraviolet light, and ozone–ultraviolet light were examined at 140°F. Nitrogen oxides, sulfur dioxide, and air were tested at 320°F. O…
Abstract The adsorption of nitroxide spin probes on smectites solvated in liquids of greatly different polarity was studied using electron spin resonance (ESR) spectroscopy. Adsorbed probes demonstrate various degrees of restricted rotational motion and alignment at the silicate surfaces, depending upon the properties…
The influence of the crystal-to-glass transition on the local structure in semiconducting compounds and alloys such as As2S3, As2Se3, As2Te3, AsSI, AsSeI, As4Te5I2, As2Se3 · As2Te3, Ge15Te85, and As4Ge15Te81 is analysed by Mössbauer spectroscopy for nuclei of 125Te, 127I, 129Te(129I), and 119Sn and by measuring the ch…
Abstract The effect of triplet sensitizers, benzophenone and anthraquinone and metal acetylacetonates [Co(II, III), Cu, Sn, and Ni] on the photodegradation of polyurethane was examined. Ultravioletvisible (UV‐V) absorption spectra, gel formation, and luminescence emission of the polymer before and after irradiation we…
Abstract Chlorite and illite are the major clay minerals in silicate assemblages from a rock salt bed in the Vernon Formation (Upper Silurian) at Retsof, New York. Textural features and Br content of the salt indicate precipitation from shallow marine brine with no subsequent postdepositional recrystallization. Sample…
Abstract The adsorption of the cationic oxidized safranine S + by a Na + , Ni 2+ and Fe 3+ montmorillonite has been studied with X-ray powder diffraction, u.v., visible and i.r. spectroscopy. In solution S + may be protonated: S + , S H 2+ and S H 2 3+ have characteristic spectra in the 500–600 nm region where the cla…
Abstract The crystal structure of Mn-bearing pectolite has been refined to R = 2.1% using crystals from Magnet Cove, Arkansas, U.S.A.: HNaCa 1.969 Mn o.045 Fe 0.014 -Si 3 O 9 , a = 7.980(1) Å, b = 7.023(1) Å, c = 7.018(1) Å, α = 90.54(1)°, β = 95.14(1)°, γ = 102.55(1)°, P [unk], Z = 2, D x = 2.906 gem −3 . The result…
Following reappraisal of the crystal structure of cubic spinels, it is suggested that the various schemes of exchange interactions which have been proposed by successive authors to explain the magnetic properties of the chromium chalcogenide spinels ACr2X4 with A = Zn, Cd, Hg, may be unnecessarily complicated. Qualita…
Laser action excitation conditions are found for new transitions of Er3+ ions in Lu3Al5O12 crystals at 300 K. With the use of the desactivation method, the way of laser parameter improvement is shown for Er3+ ions at the generation on the “self-saturating” 4I11/2 → 4I13/2 transition (2.69 to 2.94 μm). The crystal fiel…
Für Anwendungen als Lichtschalter, in der Datentechnik usw. müssen photochrome Verbindungen einen reversiblen und möglichst großen photochromen Effekt aufweisen. Die Photoreaktion (1)⇌(2) der Rhodaminderivate ist streng reversibel. magnified image
Selected area electron diffraction is described as a method for making quantitative studies of intralamellar deformation processes in micropherulitic structures. The technique is applied to characterize stress-induced twinning and phase transformations in the equatorial regions of spherulites in melt-cast spherulitie…
The hydrostatic pressure dependence of the charge-density-wave onset temperature ${T}_{0}$ in $2H\ensuremath{-}\mathrm{N}\mathrm{b}{\mathrm{Se}}_{2}$ was measured up to 20 kbar. $\frac{d{T}_{0}}{\mathrm{dP}}$ was found to be -(3.3 \ifmmode\pm\else\textpm\fi{} 0.2) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{…
Some characteristics of diamond detectors have been investigated with a view to finding out the possibilities of their application for X-ray and δ-radiation dosimetry in medical radiology. The results of this investigation are described. The design of a tissue-equivalent diamond dosimeter is shown. It possesses a unif…
The oxidation of UDP-glucose by the enzyme UDP-glucose dehydrogenase (EC 1.1.1.22) from beef liver has been shown to proceed via the enzyme-bound intermediate, UDP-alpha-D-glyco-hexodialdose. The enzyme does not release this aldehyde, nor can it be trapped by reaction with hydroxylamine, thiosemicarbazide, or cyanide.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of bis(2-pyridine sulfinato)copper(II)Lois S. Higashi, Munime. Lundeen, Ernst. Hilti, and Karl. SeffCite this: Inorg. Chem. 1977, 16, 2, 310–313Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published in…
Abstract Starch‐ g ‐polystyrene copolymers have been prepared by the simultaneous 60 Co‐irradiation of starch–styrene mixtures, and copolymers have been characterized with respect to weight per cent polystyrene (% add‐on) and also the molecular weight and molecular weight distribution of polystyrene grafts. In a typic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Characteristics of Two-Phase Flow in Monolithic Catalyst StructuresCharles N. Satterfield and Fahri ÖzelCite this: Ind. Eng. Chem. Fundamen. 1977, 16, 1, 61–67Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published inissue 1 Febr…