Materials Literature
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A theory of the central peak line shape in Raman scattering in ferroelectrics above ${T}_{c}$ is developed. Off-center ions are considered as a possible source of the local symmetry breaking. We argue that in order to properly describe the features of the central peak line shape above ${T}_{c}$ one should take into ac…
Growth of calcareous deposits on stainless steels (SS) exposed to seawater under cathodic protection (CP) conditions was examined. CP was performed by galvanic coupling with iron, zinc, or magnesium anodes. The influence of the galvanic coupling period on the temporal evolution of localized corrosion susceptibility wa…
GaSb:Te and GaInSb samples have been solidified under microgravity conditions during the D2 Spacelab mission. Experimental design and parameters are described. Analysis of the thermal data taken during the flight, associated to numerical simulations of heat transfer in the experiment, with the help of FIDAP, gave the…
The oxygen permeation flux measured as the oxide ion current density through was determined at steady state by using an electrochemical method in the range from to at T = 1273 K. The oxygen vacancy diffusion coefficient is estimated to be in the region from 1 to . When is lower than , seems to depend on a surface reac…
The IR and Raman spectra of two singly layered silicates, silinaite and makatite, have been investigated. The vibrational spectra were assigned based on previous studies of various silicates. The correlation between vibrational modes and the structural properties of silicates under investigation has been made. The IR…
An isothermal section of the Fe-Al-Co system at 923 K is experimentally investigated by means of transmission electron microscopy, energy dispersive spectroscopy, scanning electron microscopy and X-ray diffraction. In the Co-rich side, (A2+B2+A1) three-phase and (A2+B2) two-phase fields exist in addition to the (A2+A1…
Abstract Lauroylamidopropylbetaine (LPB) has good cleaning and foaming performance with excellent low skin irritation. We have investigated the relationship between cleaning performance and foaming properties of aqueous solutions containing binary and ternary LPB/nonionic surfactant systems. Foaming properties were ev…
Here we report a theoretical study of chiral nematic liquid crystals, confined to cylindrical cavities with planar anchoring conditions. Three different model structures are considered: radially twisted, eccentric radially twisted, and axially twisted structure. The Frank-Oseen free energy with additional surface ener…
LAYER is a 32-bit Microsoft Windows-based program that reads intensity data in SHELX type 4 format and displays any level of the reciprocal-lattice net. The program is primarily intended for instructive purposes, but may also prove useful as a visual complement to statistically based numeric analysis of diffraction da…
The expansion behavior of bubbles in silica glass concerning Czochralski silicon crystal growth has been investigated. It is found that most of the bubbles expand considerably under an Ar atmosphere of 20 Torr and 1500°C. The bubble expansion can be classified into three groups. The first group shows huge expansion wh…
A study has been carried out of the effect of a brief anneal at 450–550 °C on the conductivity of porous silicon coated with a metallic film. Porous silicon, formed on p -and n -type substrates, had porosities of 16–40% and 5–10%, respectively. It has been shown that for anneals at 500 and 550 °C porous silicon on p -…
The fabrication of transmission filters with single or multiple flattened passbands based on chirped Moiré gratings is reported. The gratings are fabricated by the dual-exposure of a single chirped phase mask in conjunction with an amplitude mask. The filters have a ripple < 0.5 dB in the passband, exhibit an isola…
The structures of orthorhombic lysozyme grown at basic pH and its low-humidity variant have been solved and refined at 1.9 and 2.0 A resolution, respectively. A comparison of the native structure with those of crystals grown at acidic pH does not show any systematic pH-dependent difference in the molecular geometry. T…
Chemical and biological extraction and electroultrafiltration (EUF) desorption of potassium (K) from four size‐fractions of indigenous glauconitic sandstone were studied to assess its K‐supplying potential. Potassium extracted by chemical extractants showed an increase in K release with decrease in size of the particl…
This study has characterized the influence of thermal barrier coatings (TBCs) applied to combustion chamber surfaces on the emissions from an indirect injection (IDI) diesel engine. The TBCs were applied to the piston crown, the cylinder head (fire deck) and the valves of a single cylinder Yanmar TS-180 IDI diesel uti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolydifluoroacetylene, Polychlorofluoroacetylene, and PolydichloroacetyleneGeorge L. Gould, Veena Eswara, Roxana M. Trifu, and David G. CastnerView Author Information Department of Chemistry, 845 West Taylor Street University of Illinois, Chicago, Illinois 60607-7061 D…
XPS spectra of graphite-filled poly(vinylidene fluoride) (PVdF) are presented. The specimen consists of 17 wt % PVdF and 83 wt % graphite. A freshly cut surface was examined using monochromated Al Kα x-rays. Spectra include a survey scan, C 1s and F 1s regions, and the F KLL Auger transitions.
Abstract New porous coordination polymer, {(H2dpds)2[V10O26(OH)2]·10H2O}n (H2dpds = bis(4-pyridinium) disulfide), was synthesized and structurally characterized. X-ray analysis demonstrates that the decavanadate anions are doubly bridged by H2dpds ligands to provide a one-dimensional structure. This network affords ch…
The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta[propyl]-[octasilsesquioxane] (cs) with KP(Ph)2. The transition-metal complexes [Rh(CO)(dpps)2Cl], [Rh(COD)(dpps)Cl] and [Pt(dpps)2Cl2] are synthesized as models of functionalized sili…
This work investigated the weldability and mechanical properties of weldments made with Inconel filler metals I-52 and I-82 in the welding of Inconel alloy 690. Gas tungsten arc welding was used with different multipass sequences. The microstructures of the fusion and heat affected zones were examined and weldment pro…