The luminescence of cadmium tungstate (CdWO4)
The luminescence of pure single crystals of CdWO4 is reported. Two emission bands are observed. Their decay times are measured and discussed.
Materials Literature
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Nonlinear Conductivity and Noise due to Charge-Density-Wave Depinning in Nb Se 3
A simple model for the depinning and dynamics of a sliding charge-density wave is presented. The model consists of viscously damped motion in a periodic potential and accounts for the main features of the nonlinear conductivity, noise, and ac-dc coupling in the charge-density-wave state of Nb${\mathrm{Se}}_{3}$ at low…
Two photon spectroscopy of UF6 in the near ultraviolet
The two photon excited fluorescence excitation spectrum of UF6 has been observed in the region 410 to 315 nm. The spectrum is virtually indistinguishable from the one photon absorption in this region. No vibronic structure was observed in absorption or dispersed emission. These data indicate a high density of u and g…
Raman investigation of the charge-density-wave mixed-crystal system1T−TaS2−xSex
The results of Raman scattering measurements on the mixed-crystal system $1T\ensuremath{-}\mathrm{T}\mathrm{a}{\mathrm{S}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x}$ in the commensurate charge-density-wave state are reported. In the pure compounds, our measurements indicate that a strong LA-TA phonon interaction at the dist…
Polarized low-energy-electron diffraction from W(100)
A set of polarized low-energy-electron diffraction (PLEED) data from a W(100) surface measured using a polarized electron beam is presented. The data include conventional LEED profiles $I(E,\ensuremath{\theta})$ as well as $S(E,\ensuremath{\theta})$ profiles which measure the spin dependence of the scattering. These p…
Metal-insulator transition and charge-density wave inFe0.25Nb0.75Se3
The compound ${\mathrm{Fe}}_{x}{\mathrm{Nb}}_{1\ensuremath{-}x}{\mathrm{Se}}_{3}$, which has been prepared in the form of single crystals and powders, only forms in a narrow range of stoichiometry near $x=\frac{1}{4}$. The crystal structure of Nb${\mathrm{Se}}_{3}$ is radically modified by the addition of iron and con…
On the validity of the Flory–Huggins approximation for semiflexible chains
We have found exact limits on the validity of the Flory–Huggins approximate treatment of stiff chains on a lattice for small values of g, the fraction of gauche bonds, by obtaining lower bounds for the total number of Hamilton walks WH(g) as a limiting case of the lattice model. The Flory–Huggins approximation underes…
Unified study of the lattice mechanical properties of the AgCl crystal
The silver halide crystals have many peculiarities in their physical properties which are uncommon among the simple ionic solids. The different theoretical models used to calculate the properties of this group of solids have concentrated on explaining one or the other of them. But these calculations have one major dif…
A spectroscopic study of intermediates in the condensation of refractory smokes: Matrix isolation experiments of SiO
The infrared and Raman spectra of N2 matrix-isolated silicon oxides were investigated. The vibrational frequencies of SiO, Si2O2, and Si3O3 were identified and assigned on the basis of normal coordinate analyses. Heating the solid to ∼50 K (evaporating the matrix) leaves a residue whose infrared spectrum is identical…
Synthesis and structural studies of iron(II) and iron(III) sulfonates
The iron(II) sulfonates Fe(CF 3 SO 3 ) 2 and Fe(p-CH 3 C 6 H 4 SO 3 ) 2 have been prepared and on the basis of vibrational and electronic spectra and magnetic and MÖssbauer data have been assigned a layer lattice structure involving hexacoordinated iron(II) and terdentate bridging anions. The FeO 6 chromophore in thes…
Electronic structure of metal hydrides. IV.TiHx,ZrHx,HfHx, and the fcc-fct lattice distortion
The electronic structures of $\mathrm{Ti}{\mathrm{H}}_{x}$, $\mathrm{Zr}{\mathrm{H}}_{x}$, and $\mathrm{Hf}{\mathrm{H}}_{x}$ have been studied using photoelectron spectroscopy and synchrotron radiation. Structures in the metal $d$-derived band within \ensuremath{\sim}3 eV of the Fermi level ${E}_{F}$ and in the bondin…
Fragmentation of solids under impulsive stress loading
An analysis of fragmentation due to dynamic stress loading is presented which provides analytic functions for the distributions in fragment sizes. The analysis is restricted to one‐dimensional bodies under uniform tensile loading. Concepts of survival statistics are used to account for spatially random fracture nuclea…
Oscillatory ignitions and cool flames accompanying the non-isothermal oxidation of acetaldehyde in a well stirred, flow reactor
Abstract Oxidation, cool flames and ignition in equimolar mixtures of acetaldehyde and oxygen have been studied in a well stirred, continuous-flow reactor (an open system), over temperatures from 450 to 625 K and pressures from 5 to 25 kN m-2. The reactor is a 500 cm3, spherical, glass vessel, ca. 10 cm in diameter, a…
Infrared dichroism, molecular structure, and deformation mechanisms of isotactic polypropylene
Infrared dichroism measurements can be used to study the process-structure-property relations of a polymer provided the transition-moment angle and phase absorption characteristics of the individual absorption frequencies are known. The present study describes experimental procedures for determining these intrinsic fr…
Fatigue Behavior of Steel-Sheet Fabrication Details
<div class="htmlview paragraph">This paper presents a discussion of the stress-range fatigue-design concept, including the results for 77 welded and cold-formed steel-sheet specimens exposed to constant-amplitude stress cycles with stress ratios of 0.02 to 0.34. The test specimens were fabricated from steels wit…
Full-Fluence Tests of Experimental Thermosetting Fuel Rods for the High-Temperature Gas-Cooled Reactor
The irradiation performance of injected thermosetting fuel rods is compared to that of standard pitch-based rods for test conditions exceeding current high-temperature gas-cooled reactor requirements. Thermosetting rods have processing advantages in that they can be carbonized freestanding without loss of shape, but s…
Soil in the corrosion process
Introduction Although the soil as a corrosive environment is probably of greater complexity than any other environment, it is possible to make some generalisations regarding soil types and corrosion. It is necessary to emphasise that corrosion in soils is extremely variable and can range from the rapid to the negligib…
Flavonoids of Sullivantia
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavonoids of SullivantiaDouglas E. Soltis, Paula Neuman, Tom J. Mabry, Kathleen M. Kerr, and Gerald J. GastonyCite this: J. Nat. Prod. 1981, 44, 1, 50–52Publication Date (Print):February 1, 1981Publication History Published online1 July 2004Published inissue 1 February 1981…
Untersuchungen zur Wasserstoffversprödung einiger kubisch-flächenzentrierter Werkstoffe
Electrolytical charging tests on cubic face-centered materials with different nickel contents, on CuZn 30 and the cubic body-centered reference materials X 8 Ni 9 as well as on technically pure iron. Determination of the mechanical parameters of specimens after hydrogen charging, after hydrogen charging and tempering…
Polymer–leather composites. IV. Mechanical properties of selected acrylic polymer–leather composites
An extensive study was made of the mechanical properties of the polymer–leather composite materials reported in previous articles. Polymer was deposited into leather by both emulsion and bulk (or solution) polymerization. Either methyl methacrylate, n-butyl acrylate, or a fixed comonomer mixture of n-butyl acrylate an…