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。
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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of azaporphyrinsYoshio. Niwa, Hiroshi. Kobayashi, and Toshikazu. TsuchiyaCite this: Inorg. Chem. 1974, 13, 12, 2891–2896Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Published inissue 1 December 1974ht…
The oxides of Mn and Fe or combinations of La 2 O 3 with these oxides were incorporated into PbTiO 3 under defined thermodynamic conditions. The substitution reaction of these additives was examined gravimetrically. At low partial pressures of O 2 and PbO vapor, Mn 2+ and Fe 2+ are formed at the A sites, and Mn 3+ and…
A single-crystal diffractometer has been constructed for use with γ-radiation of wavelengths down to λ = 0.03 Å. The relative line width at room temperature of the 412 keV line of radioactive gold is Δλ/λ = 10−6. The angular divergence of the primary beam in the scattering plane is equal to 10′′. The wavelength is so…
The construction and successful operation of a Laue-case skew-symmetric two-crystal X-ray interferometer is described. The alignment is accomplished with an auxiliary X-ray beam, which is multiply reflected by both interferometer parts. As expected, the skew-symmetric two-crystal interferometer is found to be consider…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the dielectric behavior of several Schiff-base and phenyl benzoate liquid crystalsR. T. Klingbiel, D. J. Genova, T. R. Criswell, and J. P. Van MeterCite this: J. Am. Chem. Soc. 1974, 96, 25, 7651–7655Publication Date (Print):December 1, 1974Publication History…
Spectroscopic measurements are reported on single crystals of the high-${\mathrm{Nd}}^{3+}$-concentration perovskite ${\mathrm{Cs}}_{2}$NaNd${\mathrm{Cl}}_{6}$ [$\ensuremath{\rho}(\mathrm{Nd})=3.2\ifmmode\times\else\texttimes\fi{}{10}^{21}$ ${\mathrm{cm}}^{\ensuremath{-}3}$] and on ${\mathrm{Cs}}_{2}$Na${\mathrm{Nd}}_…
Abstract The ESR and visible absorption spectra of a number of bis(N-salicylidenealkylaminato)copper(II) complexes with different kinds of alkyl groups were measured in toluene. The coordinations of these complexes in toluene are distorted towards a tetrahedral geometry to varying extents; the relationship between the…
Polarized-neutron diffuse-scattering measurements were made on Ni-rich NiMn alloys to determine the distribution of magnetic moments in this system. At 5-at.% Mn, the individual moments are (3.50 \ifmmode\pm\else\textpm\fi{} 0.13)${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$/Mn and (0.584 \ifmmode\pm\else\textpm\fi{} 0.0…
Abstract Synthetic kaolinites of varying crystallinity, and in some instances with ideal morphology, have been produced by hydrothermal reaction of aluminiosilicate gels. Synthetic kaolinites doped with Mg 2+ and Fe 3+ were also obtained. Synthetic kaolinite doped with Fe 3+ produced an ESR spectrum at g = 4 identical…