Materials Literature
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Abstract Plasticizers for poly(vinyl chloride) may be organized into eight chemical families and by seven key performance criteria. Cost‐effective general‐purpose phthalates provide a base line for comparing all other plasticizers. The wide range of performance characteristics associated with various phthalate isomers…
The calculated XRD profiles of alite (impure Ca 3 SiO 5 , the major phase in Portland cement) derived from seven postulated crystal structures for alite were compared with a measured alite profile, extracted from the XRD pattern of a standard Portland cement. Only two of these profiles were found suitable for multipha…
Abstract Polypropylene (PP) powder was extruded in the presence of peroxide and multifunctional monomers at varying concentrations. With increasing peroxide concentration, MFI increased almost linearly, whereas hardness, modulus, and impact strength decreased, and the results were interpreted in terms of decreased mol…
An analytic design of hybrid achromats that combine refractive and diffractive elements is presented. The design procedure does not rely on paraxial approximations and involves two separate stages. In the first stage the chromatic aberrations are corrected for the paraxial rays, and in the second stage the spherical a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature profiles and weight loss in the thermal decomposition of large spherical wood particlesRafael Bilbao, Angela Millera, and Maria B. MurilloCite this: Ind. Eng. Chem. Res. 1993, 32, 9, 1811–1817Publication Date (Print):September 1, 1993Publication History Published…
The effect of the diverging bend elastic constant, ${\mathit{K}}_{33}$, on the nematic director field of 4'-octyl-cyanobiphenyl (8CB) in submicrometer cylindrical cavities in a polycarbonate matrix, as the nematic--smetic-A phase transition is approached, is investigated with deuteron nuclear magnetic resonance ${(}^{…
With group-representation theory all quadratic invariants and the expressions of elastic energy have been derived for quasicrystals with cubic point-group symmetry. Using the generalized elasticity theory of quasicrystals, we have also obtained the expressions of the generalized Hooke's law and equilibrium for cubic q…
RATIONALE AND OBJECTIVES: The authors assessed to what extent the commonly used the magnetic resonance imaging contrast agent, gadopentetate dimeglumine, crosses the placenta. METHODS: Eight pregnant rabbits in the third trimester were injected with 0.1 mmol/kg of gadopentetate dimeglumine, and killed 5, 15, 30, or 60…
The constitutive flow behaviour in hot working of as cast magnesium has been studied with the help of a processing map developed in the temperature range 300-550°C and strain rate range 0·001-100 s−1. The map, interpreted using the dynamic materials model, revealed that the material undergoes dynamic recrystallisation…
We have studied the electron-paramagnetic-resonance (EPR) powder spectra of transition-metal-doped ${\mathrm{BaTiO}}_{3}$ processed under oxidizing and reducing conditions. From the EPR data a relative ionization-energy-level scale for the dopant species in ${\mathrm{BaTiO}}_{3}$ was established. These results along w…
The present work is a review of the substantial effort that has been made to measure and understand the effects of corrosion with respect to the properties, performance, and durability of various forms of silicon carbide and silicon nitride. The review encompasses corrosion in diverse environments, usually at temperat…
The fracture mechanics analysis of Part I is here extended to consider the effects of volume fraction and scale of second‐phase particles on the toughness‐curve properties of ceramic‐matrix composites. Increasing these variables enhances the flaw tolerance of the material, but only up to certain limits, beyond which b…
The temperature dependence of phase stability for tin-modified lead zirconate titanate solid solution ceramics Pb(0.98)Nb0.02[(Zr1−x, Snx)1−yTiy]1−zO3 (PZST) was investigated by hot-stage transmission electron microscopy. Compositions studied included, a material that was antiferroelectric (AFE) at room temperature wi…
Abstract Authigenic clay minerals in the German Rotliegend formed mainly at burial depths >1.5 km. Illite is the dominant cement, although kaolinite, dickite and early radial chlorite are abundant locally. Illites contain more AI and late chlorites more AI and Fe in sequences showing extensive grain dissolution. Th…
It is well known from experiments in acoustic cavitation that two bubbles pulsating in a liquid may attract or repel each other depending on whether they oscillate in or out of phase, respectively. The forces responsible for this phenomenon are called ‘Bjerknes’ forces. When attractive forces are present the two bubbl…
Nanometer‐sized semiconductor particles are currently being intensively investigated in many fields of physics and chemistry—especially since the discovery of visible luminescence in porous silicon. This is one of the first papers to concentrate on the synthesis of IV – IV nanoparticles. A purely wet‐chemical room‐tem…
Precise first-principles spin-polarized total-energy and band-structure calculations have been performed for the zinc-blende Mn chalcogenides with the use of the local-spin-density (LSD) approach. We find that the LSD is capable of identifying the correct magnetic-ground-state structure, but it overestimates the order…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSFG study of two-dimensional orientation of surface methyl groups on cadmium arachidate Langmuir-Blodgett filmsNaotoshi Akamatsu, Kazunari Domen, and Chiaki HiroseCite this: J. Phys. Chem. 1993, 97, 39, 10070–10075Publication Date (Print):September 1, 1993Publication History…
We studied the effect of counterion type on the ac impedance and linear sweep voltammetry response of a film consisting of Os(bpy)<sub>2</sub> (bpy indicates 2,2′-bipyridal) coordinatively bound in PVP (poly(4-vinylpyridine)). Four acids were used at 0.1 M in the aqueous bathing electrolytes: hydrochloric, perchloric,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible light-stimulated activation and deactivation of .alpha.-chymotrypsin by its immobilization in photoisomerizable copolymersItamar Willner, Shai Rubin, Ronith Shatzmiller, and Tsaffrir ZorCite this: J. Am. Chem. Soc. 1993, 115, 19, 8690–8694Publication Date (Print):…