Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
DSC thermograms show that PET fibers upon thermal treatment develop an endotherm peak between 130°C and 234°C, depending on the temperature and the time of the treatment. The available experimental data suggest strongly that the middle endotherm peak (MEP) is the result of melting of very small crystallites (nuclei) l…
The design, construction and operation of a low-energy, high-resolution electron impact spectrometer are described. Emphasis is given to the means by which a practical hemispherical deflector can be made to approach its hypothetical optimum performance. Attention is also given to the design of the accompanying electro…
The apparent effective charge Z**Cu, of copper in aluminum was measured using a quasi-steady-state technique. Z**Cu was measured in the temperature range 325–500 °C at several current densities. The measured values ranged between −4.1 and −14.9. No clear current density or temperature dependence could be seen, except…
Abstract For narrow band metals the distortions of the form of X‐ray and X‐ray photoelectron spectra are investigated under the influence of the vacancy on the inner level. A calculation method over the whole energy interval of the distoring influence of the hole field is proposed and realized numerically. The site fo…
A traditional search for solidlike singlet densities in a system with a fluidlike pair distribution function is undertaken. The analysis is based upon a nonlinear integral equation relating the direct correlation function and the singlet density in contrast with previous analyses based upon similar relations between t…