Materials Literature
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The reaction of La 1‐ x Ca x MnO 3 ( x = 0, 0.1, 0.2) with ZrO 2 ‐8 mol% Y 2 O 3 (YSZ) has been investigated at temperatures ranging from 1300° to 1425°C in air. Substitution of Ca for La in LaMnO 3 depresses the reactivity with YSZ. A layer of La 2 Zr 2 O 7 is formed at the La 1‐ x Ca x MnO 3 /YSZ interface after an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of hydrophobically modified hydroxyethyl cellulose with various added surfactantsR. Tanaka, J. Meadows, P. A. Williams, and G. O. PhillipsCite this: Macromolecules 1992, 25, 4, 1304–1310Publication Date (Print):February 1, 1992Publication History Published online…
The systematic study of band-edge luminescence in pseudomorphic Si/Si1−xGex/Si double-heterostructure layers is reported for a wide composition range, 0.12<x<0.24, for the first time. An analytical expression for the exciton energy gap at 4.2 K valid for x<0.24 is derived from the no-phonon line e…
New end‐capped oligothiophenes (see figure) have been synthesized via nickel‐catalyzed Grignard cross‐coupling reaction. Dueto the reactive positions in the terminal thiophene units being blocked it is possible to accurately characterize the spectroscopic and electrochemical properties of the materials. Estimation of…
The hot workability of an M2 type HSS in cast, forged and rolled condition has been studied by means of a torsion test and metallography. Continuous tests were used to determine the temperature and strain-rate dependence of the flow stress and temperature dependence of the strain to fracture, while multistage tests we…
Two types of silk substrate have been examined and optimum conditions for degumming with tartaric acid determined. The experiments have been carried out according to the Box and Behnken response surface design. The degumming action often other organic acids has also been evaluated.
Seven alloys for deep sour gas wells were evaluated for sulfide stress cracking resistance by the double cantilever beam (DCB) method. Representatives of 20 laboratories participated in one or both of two round-robin testing programs. These were conducted in support of the successful effort to include the DCB test in…
The hydration behavior at 25°C of β‐dicalcium silicate synthesized from hillebrandite (Ca 2 ,(SiO 3 )(OH) 2 ) at 600°C was studied over a period of 224 d. The hydration rate of the β‐dicalcium silicate having fibrous crystals with specific surface area of 7 m 2 /g is extremely rapid. For water/solids ratios of 0.5 and…
Summary This paper presents a reliable model for the solubility products of scale-forming minerals. Our model solubilities are in relatively good agreement (±5% to 10%) with the most reliable solubilities in aqueous solutions of up to twice the seawater concentration at temperatures of 20 to 150°C and pressures up to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic (gas-phase) basicity of some anionic bases commonly used in condensed-phase synthesisDeborah Thomas Grimm and John E. BartmessCite this: J. Am. Chem. Soc. 1992, 114, 4, 1227–1231Publication Date (Print):February 1, 1992Publication History Published online1 May 2002…
Aluminum-doped zinc oxide films were prepared on Corning 7059 by an inexpensive spray pyrolysis technique. Variation in structural, electrical and optical properties with doping concentration is investigated in detail. The films were highly transparent to the visible radiation and electrically conductive. X-ray diffra…
Abstract Bi 2 Se 3 single crystals were prepared in the electron concentration range from 1.8 × 10 19 to 5.6 × 10 19 cm –3 . At room temperature experimental values are given for the specific electrical resistivity, for the Hall and Seebeck coefficients, and the ir‐plasma reflectivity spectra were measured in the wave…
The ir amide bands of the triple-helical polytripeptides and collagens upon hydration of films are investigated. On the basis of our assignment of the amide I components, the formation of hydrogen bonds between the peptide backbone and structural water is studied. The C1O1--HOH hydrogen bonds are found more ordered th…
Samples from ferralitic soils of similar texture were immersed in water, placed in a pressure chamber and subjected to different soil suction pressures (pF: 2.0, 2.5, 2.8, 3.0, and 4.2). The Cie color values (intensity, hue and saturation) were taken as the spectral signatures of these soils and calculated from the di…
The electrical and optical properties of calcium and cerium-doped yttrium aluminum garnet (Ca,Ce:YAG) have been studied. Ca,Ce:YAG is a mixed ionic and electronic conductor with an ionic conductivity activation energy of 4.3 eV. Evidence of cluster formation with a consequent higher-than-expected activation energy is…
A vacuum‐pressure slip‐casting technique and hot isostatic pressing (HIPing) were used to prepare high‐strength and translucent alumina ceramics. A low‐viscosity and high‐solids‐content slurry (46 vol% solids) was prepared, and a dense green compact was formed. The samples were sintered and subjected to capsule‐free H…
The pharmacokinetic properties of the x-ray contrast medium, iodixanol, a new nonionic dimer, were investigated in a phase I study including 40 healthy male volunteers. Iodixanol (300 mg I/mL) was administered intravenously (i.v.) at four dose levels--0.3, 0.6, 0.9, and 1.2 g iodine (I)/kg body weight--and saline was…
The disposal of polymer solid waste by means other than landfilling is necessary. The various approaches-source reduction, incineration, degradation, composting, and recycling-all have their roles and must be employed in an integrated manner. Where appropriate, recycling has ecological advantages, but its application…
Diffuse scattering data have been collected on two crystal forms of lysozyme, tetragonal and triclinic, using synchrotron radiation. The observed diffraction patterns were simulated using an exact theory for simple model crystals which relates the diffuse scattering intensity distribution to the amplitudes and correla…
Electroluminescence in porous silicon at room temperature has recently been achieved. This is a crucial step in the realization of silicon‐based optoelecctronic devices but there is still work to be done, for example in improving the stability of the electroluminscence. The materials, the effect, and the potential of…