Materials Literature
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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):…
Review of Maxwell equations and units classical principles of magnetism introduction to magnetism free magnetic energy phenomenological theory electrical properties of magnetic films Kramers-Kronig relations electromagnetic wave propagation in magnetic films magnetic surface boundary conditions matrix representation o…
The motion of two gas bubbles in response to an oscillatory disturbance in the ambient pressure is studied. It is shown that the relative motion of bubbles of unequal size depends on the frequency of the disturbance. If this frequency is between the two natural frequencies for volume oscillations of the individual bub…
Abstract λ(BEDT-TSF)2GaCl4 has revealed to be a new organic superconductor, where BEDT-TSF is bis(ethylenedithio)tetraselena-fulvalene. The onset temperature of the superconducting transition was about 9.5 K and the mid-point transition temperature (Tc) was 8 K. The crystal belongs to triclinic system. BEDT-TSF molecu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ab initio MO study of the thermal decomposition of chlorinated monosilanes, SiH4-nCln (n = 0-4)Ming Der Su and H. Bernard SchlegelCite this: J. Phys. Chem. 1993, 97, 39, 9981–9985Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Publi…
Abstract In this paper, the Monte Carlo method for numerically simulating the kinetics and chain‐length distribution in radical polymerization is described. Because the Monte Carlo method is not subject to the assumption of steady‐state, it is particularly suitable for studying the kinetic behaviour before the steady‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMono(cyclopentadienyl)titanium complexes as initiators for the living ring-opening polymerization of .epsilon.-caprolactoneJun Okuda and Ilya L. RushkinCite this: Macromolecules 1993, 26, 20, 5530–5532Publication Date (Print):September 1, 1993Publication History Published on…
Monomethoxypolyethylene glycol (mPEG) of average molecular weight 5000 was transformed in a series of synthetic steps to a new activated form of PEG, a stable thiol-protected intermediary, for reaction with cysteine residues in proteins under mild conditions to produce PEG--protein conjugates as possible candidates fo…