Materials Literature
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The temperature dependence of the refractive indices of SrTiO 3 and TiO 2 was measured in the 450-1600 nm wavelength range and at temperatures from room temperature to 400 degrees C. The thermal coefficients of the refractive indices of those materials depend on temperature, and the coefficient to TiO 2 is larger than…
An analogy is drawn between continuum elastic theories of the blue phase of cholesteric liquid crystals and recent theories of frustration in configurational glasses. Both involve the introduction of a lattice of disclination lines to relieve frustration; the frustration is due to an intrinsic curvature in the natural…
uv photoemission and electron-energy-loss measurements of Si(111)-7 \ifmmode\times\else\texttimes\fi{} 7 between $T=15 \mathrm{and} 300$ K reveal significant temperature-dependent changes in the occupied surface states and their transitions which can be associated with electron-phonon coupling at the surface. Several…
Absorption and luminescence-excitation measurements show that the H3 vibronic centre in diamond (zero-phonon line at 2.463 eV) has a series of excited states which give rise to absorption lines between 3.2 and 3.6 eV. There is no luminescence produced by transitions from these higher excited states to the ground state…
<div class="section abstract"><div class="htmlview paragraph">The corrosion resistance of Zn-Ni alloy electroplated sheet steel (SZ) against perforation and cosmetic corrosion was investigated in cyclic corrosion tests and service corrosion environment.</div><div class="htmlview paragraph">Perf…
Conoscopic observations have been made on a mixture of potassium laurate, 1-decanol, and ${\mathrm{D}}_{2}$O in the discotic-uniaxial, biaxial, and cylindric-uniaxial nematic phases. The differences between the principal refractive indices have been measured, leading to a complete determination of the tensor order par…
Proximate chemical analysis was conducted on the carding, spinning and weave rooms of textile mills. The dust was found to be composed of inorganic, cellulosic and noncellulosic organics in carding and spinning. The percentage of noncellulosic organic (the component of cotton dust considered to be responsible for byss…
The Raman spectra of the ferroelastics KH3 (SeO3)2 and KD3 (SeO3)2 have been measured at several temperatures across the phase transition. Broad Rayleigh wings are observed in the B and B3g symmetry spectra. The Raman spectra indicate that the phase transitions are of an order—disorder type.
To clarify the stray light effect in a polarized component which contains information about the splay viscosity coefficient, Rayleigh scattering from a nematic, MBBA, is observed at a small scattering angle α'=8° by a highly accurate microcomputer-based photon correlation spectrometer. By tilting a homeotropically ali…
The crystal of gadolinium pentaphosphate belongs to the monoclinic system.The space group is P21/a.The crystal parameters are a=12.910(9), b=8.889(10), c=8.721(6)Å, β=90.53, z=4. The diffraction data have been col-lected by using PW-1100Four-Circle Diffractometer. The total number of inde-pendent diffraction amounts t…
Some experimental conditions which generate the dislocation-enhanced Snoek peak in Fe-C alloys are presented. The results indicate that the movement of non-screw dislocation segments is involved in the relaxation mechanism. The results are consistent with the movement of non-screw dislocations in a medium with a visco…
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Article Order-disorder transition in MgAl2O4 spinel at high temperatures up to 1700 °C was published on December 1, 1983 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 165, issue 1-4).
A relaxation time of the order parameter in the ferroelectric phase of ammonium lithium sulfate has been determined by analyzing anomalous temperature dependence of the Brillouin peak intensity. It is shown that the anomalies of the elastic constants associated with the phase transition cannot be interpreted by a conv…
Samples from the upper Oligocene and lower Miocene of Holes 515B (Brazil Basin) and 516F (Rio Grande Rise) were examined for fossil marine diatom content. The preservation of the diatoms was poor and the species diversity low in both holes. However, it was possible to zone portions of the intervals studied using the z…
The internal friction and modulus changes in pure and hydrogenated nickel are measured after plastic deformation at frequencies of 2 Hz and 30 kHz. The hydrogen dissolution strongly diminishes a Bordoni-type peak (B peak) but develops a Snoek–Köster-type peak (SK peak) at a temperature well above the B peak. The SK pe…
Programmed cooling experiments with compositions in the system MgO-SiO 2 ranging from 59 wt.% SiO 2 (with olivine on the liquidus) to 63 wt.% SiO 2 (with protoenstatite on the liquidus) cooled at rates of from 0.4 to 25% min crystallize forsterite but not pyroxene. Because pyroxene does not nucleate, the forsterite pl…
dc breakdown and corona inception voltages are reported for SF6-air and SF6-CO2 mixtures in positive and negative rod-plane gaps. These voltages are compared with values obtained for SF6-N2 mixtures. The results show that the breakdown voltages of SF6-air mixtures exhibit corona stabilization over a pressure range whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeacylation and deformylation of pyrrolesKevin M. Smith, Michiko Miura, and Hani D. TabbaCite this: J. Org. Chem. 1983, 48, 24, 4779–4781Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 1983https://doi.org/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMNDO studies of proton affinity as a probe of electronic structure. 2. Boranes and carboranesRoger L. DeKock and Craig P. JasperseCite this: Inorg. Chem. 1983, 22, 26, 3843–3848Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published i…