Materials Literature
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Prebreakdown phenomena in n-hexane are observed in detail for positive and negative polarities by using simultaneously a high speed schlieren technique and an LED current measuring system, when an impulse voltage (1.1/225 /spl mu/s) is applied to a point-to-plane electrode gap. Furthermore, the effects of several addi…
Abstract Recent pedological evidence of the widespread distribution of beidellites in soils indicates the need for a greater knowledge of the effect of charge location on the microstructural organization of Na + smectite in gels. After equilibration at a suction pressure of 3.2 kPa before and after desiccation, TEM ob…
Summary Köhler illumination is the most favourable design for the illumination path of an electron microscope with a condenser objective lens. The new illumination system of the EM 910 and EM 912 OMEGA allows both wide area (Köhler) illumination for TEM operation and spot illumination for analytical investigations. Co…
The optical-absorption transitions originating from the lowest 4f5d excited state of ${\mathrm{Pr}}^{3+}$ in ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ have been studied. The experimental arrangement uses a 7-ns 266-nm light pulse to populate the lowest 4f5d state, and a spatially overlapped, time-sequen…
Abstract The effects of crystallinity, orientation, and short‐fiber filler on the thermal diffusivity D and thermal conductivity K of poly (ether ether ketone) (PEEK) have been studied. Below the glass transition, D increases by less than 10% as the crystallinity increases from 0 to 0.3. For amorphous PEEK, there is a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMaterial Consisting of Two Interwoven 4-Connected Networks: Hydrothermal Synthesis and Structure of [Sn5S9O2][HN(CH3)3]2John B. Parise and Younghee KoCite this: Chem. Mater. 1994, 6, 6, 718–720Publication Date (Print):June 1, 1994Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParamagnetic Interactions of Triplet Radical Pairs with Nitroxide Radicals: An "Antiscavenging" EffectEugene N. Step, Anatolii L. Buchachenko, and Nicholas J. TurroCite this: J. Am. Chem. Soc. 1994, 116, 12, 5462–5466Publication Date (Print):June 1, 1994Publication History P…
SrTiO 3 films in the 100‐nm thickness range were grown on Ti foils by a 2–4 h hydrothermal treatment at 225°C in an aqueous solution of Sr(OH) 2 . X‐ray diffraction showed the principal reflections of cubic SrTiO 3 . Photoelectron analysis revealed the presence of carbon contamination and suggested the presence of hyd…
The magnetostrictive mini-actuator (MMA), with its unique characteristics such as large strain, high force and high energy density, is potentially a new class of actuator most suitable for distributed actuator applications such as vibration control of smart structures. The authors present a theoretical framework, vali…
High‐resolution neutron powder diffraction was used to study the residual stresses in Al 2 O 3 ‐ZrO 2 (12 mol% CeO 2 ) ceramic composites containing 10, 20, and 40 vol% ZrO 2 (CeO 2 ). The diffraction data were analyzed using the Rietveld structure refinement technique. The analysis shows that for all samples, the CeO…
A polymer chain under good solvent condition near a short-range attractive impenetrable wall (xy plane) is investigated by dynamic Monte Carlo simulation using the bond-fluctuation model. For the statics, the adsorption transition is clearly observed and the adsorption transition temperature, ${\mathit{T}}_{\mathit{a}…
The characteristic morphology of tetrapod-shaped ZnO particles grown by oxidizing zinc vapour in air has been thoroughly interpreted by a growth process from octahedral multiple-twin embryos. The origin of the tetrapod-shape arises from firstly the formation of octahedral multiple twins due to the small c/a ratio of w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Polystyrene Having an Aminoxy Terminal by the Reactions of Living Polystyrene with an Oxoaminium Salt and with the Corresponding Nitroxyl RadicalEri Yoshida, Takashi Ishizone, Akira Hirao, Seiichi Nakahama, Toshikazu Takata, and Takeshi EndoCite this: Macromolec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis of a Novel Naphthalene-Based Poly(arylene ether ketone) with High Solubility and Thermal StabilityMami Ohno, Toshikazu Takata, and Takeshi EndoCite this: Macromolecules 1994, 27, 12, 3447–3448Publication Date (Print):June 1, 1994Publication History Published online1 Ma…
The concept of a variable-counting-time (VCT) strategy for use in Rietveld analysis of X-ray powder diffraction data was introduced by Madsen & Hill [Adv. X-ray Anal. (1992), 35, 39–47]. This strategy is based on a function that increases the counting time used at each step in the scan in a manner that is inversely pr…
The effects of fiber composition, size, and surface treatment on the mechanical behavior of slip‐cast fused‐silica composites were investigated. The ambient and 1000°C stiffness and strength, fracture toughness, G R ‐curve behavior, and fiber‐matrix interface bond strength were determined. Quantitative fractography an…
Compression tests have been used to determine the Hall-Petch parameter and the ductility has been measured under tension in three FeCo alloys, Fe30Co, Fe50Co and Fe70Co (compositions given in atomic percent throughout) in both their ordered and disordered states. It was that disorder, either constitutional or therm…
Crystalline disorder in thin films plays an important role in determining their properties. Disorder in the crystal structure of MoS 2 films prepared by magnetron sputtering and pulsed laser deposition was evaluated with the use of Raman spectroscopy. The peak positions and bandwidths of the first-order Raman bands, i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous Spreading of Liquid Drops on an Elastomeric SurfaceMartin E. R. Shanahan and Alain CarreCite this: Langmuir 1994, 10, 6, 1647–1649Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/do…
Abstract This paper reviews current information about potassium (K) in the soils of New Zealand, based on work conducted since the 1920s. The forms of K existing in soils are discussed and related to the K status of the genetic soil groups. The methods used in New Zealand to assess K‐supplying power, K‐releasing power…