Materials Literature
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Mullite composites toughened with ZrO 2 (with or without a MgO or Y 2 O 3 stabilizer) and/or SiC whiskers (SiC( w )) were fabricated by hot‐pressing powders prepared from Al, Si, Zr, and Mg(Y) alkoxide precursors by a sol–gel process. Micro‐structures were studied by using XRD. SEM, and analytical STEM. Pure mullite s…
Over the last twenty years, unified viscoplastic constitutive models have evolved to meet this need. These constitutive models provide a means for representing a material's response from the elastic through the plastic range including strain-rate dependent plastic flow, creep, and stress relaxation. Rate-dependent pla…
Abstract Messung der elektrischen Leitfähigkeit von Na 3 O(NO 2 ) und Na 3 O(CN) zeigen, daß beide Verbindungen bei Temperaturen zwischen 200° und 250°C eine sprunghafte Zunahme der Natrium‐Ionenleitfähigkeit aufweisen. Diese Effekte beruhen nicht auf Schmelzprozessen, wie die Phasendiagramme der entsprechenden pseudo…
Discusses the quality of fabrics and garment technology. Looks at the various types of material focusing particularly on the female market. Shows how new synthetic fibres have improved the feel of garments and that consumers, fashion designers and experts in finishing have all reached the same conclusion, that quality…
Dislocation structures and faults in vacuum-hot-pressed Be12Nb have been examined after compressive deformation at 1200[ddot]C. Both perfect and partial dislocations were observed in the deformed polycrystalline material. Most dislocations were found to be partials bounding planar faults in the grains characterized. S…
The two limits for modeling vibrating thin films, viz as a plate or as a membrane, are discussed. In terms of these limits the sources of experimental uncertanties are identified and the advantages of using films which can be modeled as membranes are explained. The mathematical formalism for treating films as vibratin…
Polarized infrared and optical reflectance spectroscopies were used to study the structural phase transition in the organic charge-transfer salt N-propylquinolinium ditetracyanoquinodimethane. Above the 220-K phase-transition temperature, the spectra are characteristic of other 1:2 semiconducting charge-transfer salts…
A liquid crystalline copolyester consisting of 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, with a composition (73:27) was studied as a melt processible, high temperature adhesive. The polymer was used as received without any additional treatment and was applied on an aluminum substrate as a film. The adhesiv…
Subtilisins are extracellular seryl-proteases produced by bacilli (Markland and Emil, 1971). In addition to signal sequences, these proteases have N-terminal extensions (pro-regions) which have also been identified in several other proteases (Silen et al., 1988; Vasantha et al., 1984; Polhner et al., 1987; Henderson e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of catalytically important palladium complexes studied by photoelectron spectroscopyF. Boekman, A. Gogoll, L. G. M. Pettersson, O. Bohman, and H. O. G. SiegbahnCite this: Organometallics 1992, 11, 5, 1784–1788Publication Date (Print):May 1, 1992Publicati…
Abstract The fast luminescence, the transient absorption spectra, and the recombination kinetics are observed and investigated in α‐Al 2 O 3 . Absorption spectra reveal short‐lived bands at 2.75 and 2.15 eV. Their decay times remain the same (30 to 200 ns) in the temperature interval 80 to 293 K. They are found to be…
Archimedian spiral wave instabilities have been discovered in chemical [1] and biological systems [2]. We present here the first example of such an instability pattern, encountered in a physical medium [3]. This instability is directly observed by polarized optical microscopy, on a positive dielectric anisotropy smect…
Cast iron balls have been used for decades as a grinding media in all types of grinding applications. Early applications of cast iron grinding balls in mineral processing operations were disastrous due to spalling and premature breakage. Better control and understanding of a high chromium cast iron metallurgical syste…
The dielectric properties of a high-tilt-angle chiral-nematic--smectic-${\mathit{C}}^{\mathrm{*}}$ phase ferroelectric liquid crystal are studied in the frequency range of 30 Hz to 1 MHz. Measurements of electric permittivity at different temperatures and biasing fields were taken in thin homogeneously aligned samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand isomerism and stacking in square planar platinum(II) complexesM. J. Coyer, M. Croft, J. Chen, and R. H. HerberCite this: Inorg. Chem. 1992, 31, 10, 1752–1757Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992h…
Within the framework of the European DEMO blanket study programme, this paper describes the design work performed on the “box-shaped” concept for water-cooled Pb-17Li blankets in the past two years. The first part of the paper describes the general design, and the thermo-mechanical and neutronical analyses of the main…
The spatial distribution of the total energy is used to determine the magnetic behavior of ferromagnetic single crystals. For a single ferromagnetic domain there exists only a homogeneous magnetization the direction of which must correspond to a minimum energy direction. Magnetization curves are calculated by observin…
Conducting organic materials have drawn considerable attention due to the exciting possibilities of creating metallike conductivity and superconductivity and the potential applications of their interesting electrical, optical, and magnetic properties. The discovery of metallic conductivity in molecular organic systems…
Both magnetoelastic and neutron-diffraction studies have been performed on Cr-Al single crystals containing 1.2, 1.9, and 2.6 at. % Al. These concentrations lie in a controversial region of the magnetic phase diagram. For the crystals containing 1.2 and 1.9 at. % Al the transition at the N\'eel point is from a paramag…
Abstract Pressure relief venting of a runway reaction with gas generation is examined in terms of the overall system response and the associated venting requirement. This article presents an exact formulation as well as an approximate analytical approach. The latter is shown to be particularly useful in vent‐sizing ap…