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 literature dealing with the high-temperature behavior of inorganic nitrates and nitrites has been critically reviewed. Values of (GTo−H298o)/T of the reactants and products of the decomposition reactions were calculated and have been tabulated from 298 K up to as high a temperature as possible. Equilibrium constan…
The lattice version of the Maier-Saupe model of a nematic liquid crystal, in which all molecules are restricted to be on a simple-cubic lattice with periodic boundary conditions and to interact only with their nearest neighbors through the interaction energy ${E}_{\mathrm{ij}}=\ensuremath{-}\ensuremath{\epsilon}(\frac…
Metallic double-exchange ferromagnets such as doped LaMnO 3 are investigatd on the basis of an efffective Hamiltonian derived from the s - d model Hamiltonian. Resistance at low temperatures is calculated in the spin wave approximation and it is found to be proportional to T 9/2 . Magnetic behaviors of the system at f…
The transient distortions, induced in a nematic film by a stepwise increase (or decrease) of the magnetic field around the threshold value ${H}_{c}$, are accurately measured by conoscopic techniques. The results can be interpreted by the Leslie equations and provide a measurement of a viscosity coefficient.
Abstract On a montré que les fonctions terminales d'un polyoxyéthylèneglycol disodé sont capables d'amorcer la polyaddition de l'ε‐caprolactone. On a préparé de cette manière une série de copolymères triséquencés poly‐ε‐caprolactone/polyoxyéthylène/poly‐ε‐caprolactone, comportant des séquences de longueur variée. Les…
We show that elastic strain energy may account for the tendency of some nematic liquid crystals to lie parallel to the direction of rubbing on a solid surface that has been slightly deformed by rubbing, or perpendicular to a surface that is slightly rough in two dimensions.
SINCE MEADOWCRAFT REPORTED THAT STRONTIUM-DOPED LACO03 WAS COMPARABLE TO PLATINUM AS AN OXYGEN ELECTRODE, THE TESTING OF THE CATALYTIC ACTIVITY OF LACO03 ON CERTAIN GAS SYSTEMS HAS BEEN PURSUED. THIS PARTICULAR RARE EARTH COBALT OXIDE AGAIN HAD ACTIVITY WHICH RIVALED PLATINUM. THE COMPOUND WAS SUGGESTED AS A CANDIDATE…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHemin monomers in micellar sodium lauryl sulfate. Spectral and equilibrium study with cyanideJon SimplicioCite this: Biochemistry 1972, 11, 13, 2525–2528Publication Date (Print):June 20, 1972Publication History Published online1 May 2002Published inissue 20 June 1972https://…
Experimental results given in Part I and II are interpreted with the help of a band scheme including five energy levels: β (1.91 eV above the VB, due to exciton—neutral acceptor complexes creation with 0.1 eV binding energy), A (0.55 eV above the VB, copper vacancies V), B (0.76 eV above A, [V—V] vacancy associations)…
The EPR spectrum of ${\mathrm{Mo}}^{5+}$ in SrTi${\mathrm{O}}_{3}$ at $T=1$. 65 \ifmmode^\circ\else\textdegree\fi{}K is reported. The spectrum is stable in suitably prepared samples or light-induced (3900-4300-\AA{} light) in photochromic samples, and can only be observed at liquid-helium temperatures. The $g$ tensor…
Some rate data for the transfer of a deuterium atom tracer between hydrogen and water vapor, catalyzed by platinum supported on γ-alumina, are reported. Above 100 °C the transfer rate measured at 1 atm total pressure is shown to be free of mass transfer effects, and obeys an initial first order dependence on water vap…
Reflectivity and wavelength-modulation-derivative-reflectivity spectroscopy have been performed on the alloy series ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}$ throughout the compositional range $0\ensuremath{\le}x\ensuremath{\le}1$. PbTe and SnTe reflectivities were studied from 0.5 to 21 eV and th…
The pressure dependence of the ionic conductivity of KCl, NaCl, KBr, and NaBr has been measured to 6 kbar in the intrinsic and extrinsic temperature regions. In the intrinsic region the conductivity deviates markedly from a simple exponential decrease with pressure. A detailed analysis, including contributions from an…
The Auger spectra of vanadium metal and of the oxides VO0.92, V2O3, and VO2 have been studied. Chemical shifts on the order of 0.6 eV per oxidation number have been observed for the vanadium inner shell Auger transitions. Relative intensities of the oxygen and vanadium Auger peaks could be used to determine the surfac…
The infrared and Raman spectra of acetone oxime have been investigated from 70 to 4000 cm−1. Spectra have been obtained for the gaseous, liquid, and polycrystalline materials, and the data have been interpreted in detail. A suggested vibrational assignment for the molecule is based upon group frequency correlations, r…
The polarization properties of the various diffracted orders from a grating are determined ellipsometrically. The ratio ${\ensuremath{\rho}}_{m}$ of the far-field complex reflection coefficients for the $p$ and $s$ polarizations for any order $m$ is measured. This information is complementary to the data available fro…
The dc electrical resistivity $\ensuremath{\rho}$ and Hall effect were measured in $n$-type EuS single crystals. Data were taken from 300 to 2 K in magnetic fields $H$ up to 140 kOe. At room temperature all samples had resistivities of the order ${10}^{\ensuremath{-}2}$ \ensuremath{\Omega}cm and contained $n\ensuremat…
By changing the location of Fermi level of TiO 2 by lithium doping, ESR signals of some transition metal impurities in this crystal were pursued. The conclusions are: the Cr 3+ , Mn 4+ and Fe 3+ levels are near or overlapped with the valence band, the V 3+ , Mn 2+ and Fe 2+ levels are near the conduction band, the Cr…
CsCl type NH 4 Br crystal has been treated as an Ising spin-phonon coupled system to explain the phase transitions associated with the orientational order of NH 4 + ions. The appearance of two ordered phases is explained as essentially due to the fact that the direct interaction between NH 4 + ions stabilizes parallel…
International audience