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。
Both deformation twinning and martensitic transformation may be regarded as modes of deformation, and models which relate the nucleation and growth of twins and martensite plates to dislocations and stacking faults are reviewed. Recent experimental and theoretical work indicates that b. c. c. twins mays originate from…
A dynamical model is described which permits calculation of the excitation currentIas a function of time in a laminated grain-oriented (G-O) steel transformer core. The independent variable is the magnetic flux density or, equivalently, the coil voltage less theIRdrop associated with the resistanceRof the windings. Re…
The nature of the concentration fluorescence quenching of Nd3+ in silicate glasses, which is associated with the reaction Nd3+ (4F3/2) + Nd3+ (4I9/2) → 2Nd3+ (4I15/2), has been reinvestigated by monitoring the fluorescence intensity of Nd3+ at 1060 nm as a function of time. The experimental decay curves were compared…
SUMMARY The theory of interfaces between crystals of different structure and/or composition is briefly reviewed. The review is limited to planar semi‐coherent interfaces with an abrupt transition from one crystal to the other. Equilibrium, obeying minimum ( free) energy requirements, is introduced as a governing princ…
Abstract Three binuclear copper(II) complexes, Cu2(fsal-NMe2)(NCS)3, Cu2(fsal-NEt2)(NCS)3 and Cu2(fsal-pa)(NCS)3, have been synthesized and characterized, where Hfsal-NMe2, Hfsal-ENt2 and Hfsal-pa denote the Schiff bases prepared by the condensation reaction of 2,6-diformyl-4-methylphenol with N,N-dimethylethylenediam…
Results are reported of high resolution transmission measurements on Teflon, ${(\mathrm{C}{\mathrm{F}}_{2})}_{n}$, for the total cross section of natural fluorine vs energy from 500 eV to 200 keV. This region has three strong $l=1$ levels which were fitted using a multilevel $R$-matrix analysis. The best fit (${E}_{0}…
Structural changes in glassy poly(ethylene terephtbalate) and their effects on its crystallization, melting, and various properties were studied. Quenched, annealed below Tg, crystallized, and drawn samples were studied using calorimetry, wide-and small-angle X-ray diffraction, mechanical spectroscopy, and stress-stra…
International audience
Auger electron spectroscopic analyses of the chemical changes taking place on a commonly used dispenser cathode have been carried out during activation and poisoning by several reactive gases (O2, CO, CO2, H2, N2, Ar). The chemical composition and work-function changes on the cathode were correlated at various stages…
Abstract The effect of hexavalent chromium ions on the photosynthesis and growth of the diatom Nitzschia palea and the green alga Chlorella pyrenoidosa has been studied and compared with the effect of Cu and Hg. The effect of chromium is very similar to that of Cu and Hg, but it is more than one hundred times less tox…
Simple analytical expressions for calculating the electron-ion, free-free Gaunt factor for high electron temperatures (>or=1eV/k) and long wavelengths (>or=0.1 mu m) are presented. The values of the Gaunt factor are displayed in a graphical form for wavelengths in the range 0.1-100 mu m.
Abstract Zinc silicates were synthesized under conditions analogous to surficial weathering environments. The main product, regardless of conditions of precipitation or ageing, was shown by X-ray, i.r., electron microscopic and chemical evidence to be a 2:1 layered zinc silicate equivalent of stevensite. In the presen…
Summary The positions of all the atoms including hydrogen have been found by a partial three-dimensional single-crystal neutron-diffraction study in which about one-third of the reflections in the reciprocal sphere to 1·5 Å were measured. The hydroxyl group is perpendicular to the plane of the silicate sheets. The flu…
High pressure optical studies have been made on a series of bianthrones dissolved in polymethyl methacrylate (PMMA). At sufficiently high pressure at room temperature, significant occupation of the photochromic (B) state occurs, but the yield is different for the different derivatives; it is especially small for the 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and polymerization of 3-vinylbisfulvalenediiron. Preparation and conductivity of its polymeric [FeIIFeIII](TCNQ)2.-saltsCharles U. Pittman Jr. and B. SurynarayananCite this: J. Am. Chem. Soc. 1974, 96, 26, 7916–7919Publication Date (Print):December 1, 1974Publicati…
Abstract Absorption spectra are presented of V 2 O 5 single crystals in the range 0.5 to 2.1 eV. From the behaviour of the optical absorption upon reduction, reoxidation, and annealing it follows that two different centres are active. The bands observed at 1.25 and 1.52 eV for a polarization parallel to the a ‐axis (…
The structural changes accompanying capacity loss in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:msub> <mml:mi mathvariant="normal">PbO</mml:mi> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:msub> <mml:mi mathvariant="no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContinuous and discontinuous thermochromism of copper(II) and nickel(II) complexes with N,N-diethylethylenediamineL. Fabbrizzi, M. Micheloni, and P. PaolettiCite this: Inorg. Chem. 1974, 13, 12, 3019–3021Publication Date (Print):December 1, 1974Publication History Published…
CMP-sialic acid hydrolase catalyses the reaction: CMP-sialic acid → sialic acid + (CMP) Enzymatic activity was measured by following both the disappearance of substrate, CMP-[14C]sialic acid, and the appearance of product, [14C]sialic acid, after separation by ion exchange column chromatography. The stoichiometry of t…
In the i.r. emission of ZnS:Cr crystals, a zero-phonon doublet at 5211 and 5216 cm -1 and a number of vibronie bands are resolved at T ≈ 4 K. The T d symmetry of the crystal field at the Cr 2+ ion on a Zn lattice site is reduced to D 2d by a static Jahn-Teller effect. Differences in the vibronie structures of absorpti…