Materials Literature
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The density of Ga 2 O 3 liquid in equilibrium with air has been measured at 1800 0 to 1900 0 C using an Ir double‐bob Archimedean method. The data yield the following description of the density of Ga 2 O 3 liquid: ρ= 4.8374(84)–0.00065(12)(T −1850 0 C). This density‐temperature relationship is compared with the partia…
XPS indicates that the organometallic compd. [PtI[C6H3(CH2NMe2)2-2,6](h1-I2)], (I), representing an end-on coordinated dihalogen intermediate in the oxidative addn. reaction of dihalogen to d8 metal centers, contains platinum in a divalent oxidn. state. The use of a monochromatized x-ray source, short measurement time…
Research studies which provide insight into the response of human skin to fabric when contacted by and/or covered with fabric are reviewed When possible, the fabric parameter thought influential in eliciting a certain response (e.g., increase in capillary blood flow, hydration state) is given. The operating principles…
Stimulated-photon-echo measurements as a function of both the first-to-second (\ensuremath{\tau}) and the second-to-third (T) pulse separations were conducted to study the echo-modulation behavior for the $^{3}$${\mathit{H}}_{4}$${\mathrm{\ensuremath{-}}}^{1}$${\mathit{D}}_{2}$ transition of a cryogenic ${\mathrm{Pr}}…
Abstract The microstructures across the whole thickness of uncorroded and corroded rapidly solidifed Mg and Mg‐9% Al ribbons have been characterized using TEM cross‐sectional techniques. In this way, differences in susceptibility to and mechanisms of corrosion initiation between four clearly different magnesium alloy…
In Shanghai, China, industrial contamination is very severe and periodic insulator washing is performed not only in substations but also on transmission lines. In order to review the present insulator contamination design and maintenance practices, a series of periodical contamination measurements under de-energized c…
The attcntuation of ultrasonic waves propagating in polycrystalline metals is a subject which has received considerable experimental and theoretical attention. Important recent contributions include the work of Hirsekorn and of Stanke and Kino. In this paper, we extend the approach of the latter authors to a particula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza-bridged, closely interspaced, cofacial bis(5,10,15,20-tetraphenylporphyrin)s. 2. Synthesis, characterization, and conformational effects of solventsRafik Karaman, Andrei Blasko, Orn Almarsson, Ramesh Arasasingham, and Thomas C. Bru…
Abstract K 2 YZr(PO 4 ) 3 and K 2 GdZr(PO 4 ) 3 were found to have the langbeinite-type structure (K 2 Mg 2 (SO 4 ) 3 ). We determined the crystal structure of these compounds from powder diffraction data. They are cubic P2 1 3 (no. 198), with a = 10.3346(1)Å and a = 10.3457(3)Å respectively. The intensity values we o…
We report accurate temperature dependent measurements of optic indices of refraction, the birefringence, and the strain in the ferroelectric tungsten bronze crystals Ba0.25Sr0.75Nb2O6 and two compositions of (Ba2−xSrx)2(K1−yNay)2(NbO3)10. These results are compared to our previous results in Ba0.4Sr0.6Nb2O6. From the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane reactions with photoactivated decatungstate in neutral and acid solution: molecular orbital theoryS. F. Jen, Alfred B. Anderson, and Craig L. HillCite this: J. Phys. Chem. 1992, 96, 13, 5658–5662Publication Date (Print):June 1, 1992Publication History Published online…
Abstract Iron-rich dioctahedral 2:1 clays were sampled in metalliferous sediments from Atlantis II Deep (Red Sea), and studied by XRD, TEM, FTIR and Mössbauer spectroscopy. One sample with the structural formula (Si 3·94 Fe 3+ 0·06 )(Fe 3+ 1·90 Mg 0·10 )K 0·1 (Mg, Ca) 0·03 is closer to the theoretical end-member ferri…
Abstract The crystal structure of sophiite, Zn 2 (SeO 3 )Cl 2 (a = 10.251(4), b = 15.223(2), c = 7.666(5) Å, Z = 8) was solved in space group Pccn from single crystal X-ray data, and refined to R = 0.053 for 666 F o > 4o F o . The mineral belongs to layer compounds. The threefold coordinated Se atom is at the apex…
The most basic single axial cyclic motion (i.e. fatigue) tests by the alternative heating up and cooling down of shape memory Ti-Ni50.2at%wires were performed. Heating up was done by direct current method or temperature controllable water-bath and the characteristics on the cyclic motion and its degradation in shape m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient catalysis of a redox reaction by an artificial enzymeHongping Ye, Weida Tong, and Valerian T. D'SouzaCite this: J. Am. Chem. Soc. 1992, 114, 13, 5470–5472Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric effects in photochromic polysiloxanes with spirooxazine side groupsAlexander Zelichenok, Frida Buchholtz, Shlomo Yitzchaik, Judith Ratner, Mark Safro, and Valeri KrongauzCite this: Macromolecules 1992, 25, 12, 3179–3183Publication Date (Print):June 1, 1992Publication…
Abstract XPS was used to study the initial stages of aluminium deposition on polypropylene. Aluminium was ion sputtered in the preparation chamber of the spectrometer with controlled oxygen and H 2 O partial pressures. The surface composition of the polymer before and after metallization was analysed by XPS and the co…
The effect of time-periodic vertical gravity modulation on the onset of thermosolutal convection in an infinite horizontal layer with stress-free boundaries is investigated using Floquet theory for the linear stability analysis. Situations for which the fluid layer is stably stratified in either the fingering or diffu…
TiO 2 above 4 mol% is an effective nucleating agent for CaO–P 2 O 5 glass which also contains substantial SiO 2 and Al 2 O 3 additions. Glass ceramics can be made from this glass using a single slow heating ramp with no need for a nucleating heat treatment step. Powder of this composition crystallizes rapidly to β‐Ca…
Abstract Hydrogen and hydrogen‐containing species (H 2 O, OH etc.) play a dominant role in the various properties of glass surfaces and technical oxidic thin films deposited on glass. The amount of hydrogen and its distribution with depth are influenced by preparation and production processes, film materials, density…