Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTropylium Ion Formation from Toluene: Solution of an Old Problem in Organic Mass SpectrometryChava LifshitzCite this: Acc. Chem. Res. 1994, 27, 5, 138–144Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pub…
Abstract Pure polycrystalline Al (99.998%) was oxidized in dry oxygen and water. The surface products formed were analysed by ESCA. The thicknesses of the amorphous Al 2 O 3 formed during oxidation for 1 h in dry oxygen at 25°C and 250°C are 14 and 20 Å, respectively. During exposure of the oxidized sample to water a…
The safety and magnetic resonance (MR) imaging potential of BMS 180549, a new superparamagnetic iron oxide contrast agent, were evaluated in a phase I, open-label, placebo-controlled study involving 41 healthy subjects. No clinically significant postdose changes in physical examination findings, vital signs, or electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox Processes on Pure Ceria and on Rh/CeO2 Catalyst Monitored by X-Ray Absorption (Fast Acquisition Mode)J. El Fallah, S. Boujana, H. Dexpert, A. Kiennemann, J. Majerus, O. Touret, F. Villain, and F. Le NormandCite this: J. Phys. Chem. 1994, 98, 21, 5522–5533Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular Organization of Imidazolyl-Porphyrin to a Slipped Cofacial DimerYoshiaki Kobuke and Hidekazu MiyajiCite this: J. Am. Chem. Soc. 1994, 116, 9, 4111–4112Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 199…
Abstract The α‐relaxations in homogeneous polymer blends are often compared with the corresponding relaxations in their pure components, an effect that has long been associated qualitatively with concentration fluctuations. A novel “fluctuation model” describes very accurately the observed dielectric relaxation curves…
We have performed a thermodynamical analysis of the phase diagrams for ${\mathrm{ZrO}}_{2}$-CaO and ${\mathrm{ZrO}}_{2}$-MgO solid solutions which has demonstrated that differential heats of mixing are important parameters determining the stabilization of the cubic phase of ${\mathrm{ZrO}}_{2}$ by impurities. It is sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCooperativity of the Coil-Globule Transition in a Homopolymer: Microcalorimetric Study of Poly(N-isopropylacrylamide)E. I. Tiktopulo, V. E. Bychkova, J. Ricka, and O. B. PtitsynCite this: Macromolecules 1994, 27, 10, 2879–2882Publication Date (Print):May 1, 1994Publication H…
A micromechanics method based on the Mori-Tanaka averaging scheme is used to predict the effective thermomechanical properties of composite materials reinforced by Shape Memory Alloy (SMA) fibers. Both elastic stiffness changes and transformation strains are taken into account in the constitutive modelling of the SMA…
From an analysis of current data on 16 protein structures with defined nucleotide-binding sites consensus motifs were determined for the peptide segments that form such nucleotide-binding sites. This was done by using the actual residues shown to contact ligands in the different protein structures, plus an additional…
The pathway of poly-beta-hydroxybutyric acid (PHB) exhibits a mode of transcriptional control induced by environmental stress. A new cybernetic model for coordinated regulation of stress-induced metabolism was developed to predict the growth and the synthesis of PHB in Alcaligenes eutrophus. A plausible objective for…
Chemical relaxation experiments were conducted on sintered samples of calcium‐doped lanthanum chromites by abruptly changing the oxygen partial pressure in the atmosphere and following the time change of conductivity. The re‐equilibration kinetics was analyzed by fitting the relaxation data to the solutions of Fick's…
Two methods are used to develop nondivergent, compact, sum-over-states formulas for dynamic hyperpolarizabilities up to fifth order. Expressions for both atoms and molecules are given; those at fourth and fifth order for the first time. The fifth-order formula is related to such nonlinear optical phenomena as stimulat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuasirelativistic Pseudopotential Study of Species Isoelectronic to Uranyl and the Equatorial Coordination of UranylPekka Pyykkoe, Jian Li, and Nino RunebergCite this: J. Phys. Chem. 1994, 98, 18, 4809–4813Publication Date (Print):May 1, 1994Publication History Published onl…
The modified embedded atom method (MEAM), an empirical extension of the embedded atom method (EAM) that includes angular forces, has been used to examine the interface between a silicon substrate and a thin overlayer of nickel. A brief review of the MEAM is given and parameters are determined for the Si-Ni system. As…
Abstract. We discuss two new results on tilings of the plane. In the first, we give sufficient conditions for the tilings associated with an inflation rule to be uniquely ergodic under translations, the conditions holding for the pinwheel inflation rule. In the second result we prove there are matching rules for the p…
X‐ray absorption spectra at the Zr‐, Y‐, and Nb‐ K edges of ZrO 2 ‐YNBO 4 solid solutions have been measured at 10 K to determine the local atomic structures. Both Y and Nb cations substitute for Zr in the cation network but maintain rather different local oxygen coordination from Zr. In tetragonal zirconia solid solu…
Abstract The effect of copolymerization of L ‐lactide with several lactones and cyclic carbonates and the processing variables in compression moulding of poly( L ‐lactide) homopolymers on the mechanical properties was investigated. Sharp maxima in the impact strength versus comonomer composition and heat of fusion wer…
A 16-residue amphiphilic oligopeptide (EAK16) with every other residue alanine and also containing glutamic acid and lysine (Ac-NH-AEAEAKAKAEAEAKAK-CONH2) is able to form an unusually stable beta-sheet structure. The beta-sheet structure is stable at very low concentrations in water and at high temperatures. Various p…
Measurements of relative permittivity (\ensuremath{\varepsilon}=\ensuremath{\varepsilon}\ensuremath{'}-i\ensuremath{\varepsilon}\ensuremath{''}) in the complex perovskite crystal ${\mathrm{Na}}_{1/2}$${\mathrm{Bi}}_{1/2}$${\mathrm{TiO}}_{3}$ were carried out as functions of frequency (0.02--300 kHz) and temperature (3…