Materials Literature
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Thermorheological simplicity (TRS) in the glass transition is derived from the principle of temperature (actual and fictive)‐time equivalence. Methods of formulating structural relaxation models consistent with TRS are given. Nonlinear dependence of properties on glass structure ( T f ) and temperature ( T ) is taken…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTf-Element/crown ether complexes. 22. Preparation and structural characterization of lanthanide chloride complexes of 12-crown-4Robin D. Rogers, Andrew N. Rollins, and Matthew M. BenningCite this: Inorg. Chem. 1988, 27, 21, 3826–3835Publication Date (Print):October 1, 1988Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteronuclear NMR studies of cobalamins. 9. Temperature-dependent NMR of organocobalt corrins enriched in carbon-13 in the organic ligand and the thermodynamics of the base-on/base-off reactionKenneth L. Brown and Sherri Peck-SilerCite this: Inorg. Chem. 1988, 27, 20, 3548–3…
Abstract The solubilities of HCl-treated samples of corundum, gibbsite, boehmite, and diaspore in aqueous solutions at 298 K and one atmosphere pressure were determined from undersaturated and supersaturated initial conditions. Solution characteristics at apparent equilibrium were measured and used to calculate equili…
The inner-sphere water coordination number for Eu3+ and Gd3+ complexed with five DTPA analogs, in which one or two terminal carboxylate groups are functionalized as propyl amides or propyl esters, have been studied using phosphorescence lifetime and nuclear magnetic relaxation dispersion (NMRD) measurements. Both meth…
X-ray diffraction measurements have been carried out on bis(1,3-di(p-n-alkoxyphenyl)propane-1,3-dionato)copper(II) to clarify the detailed structural properties on the discotic mesophase. It is confirmed that the lamellar structure is realized in the discotic phase and the tilt angle of molecules to the layer is about…
Using the classical oscillator model, the optical dielectric functions for amorphous alumina (a-Al2O3) and gamma alumina (γ-Al2O3) thin films prepared by ion implantation and subsequent annealing of sapphire (α-Al2O3) substrates were determined for the first time from analysis of infrared reflection spectra. Two trans…
To explain the low-frequency dielectric relaxation of many types of materials, the current relaxation phenomenon induced in an inhomogeneous conductor with a spatial distribution of local conductivity is investigated. The nonuniform current density produces the true charge (conduction charge). The origin of the relaxa…
An experimental apparatus has been developed to permit the simultaneous measurement of moisture sorption by a fabric and moisture flux through a fabric during the transient period after the fabric is exposed to a humidity gradient. By suitable manipulation of the experimental conditions, the method demonstrates that m…
compatible with A1-Fe phases in the same composition range; (3) the m value is ~4.0-4.4; (4) the strongest diffraction spots are fundamental, i.e. most atoms scatter in phase. From these assumptions, a framework of 126 atoms in the unit cell was set up, which produced the strongest diffraction spots. 'Vacancies' and F…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The structural gene of pyruvate formate-lyase (pfl) and that of pyruvate-formate-lyase-activating enzyme were shown to be adjacent on the chromosomal map of Escherichia coli. DNA sequencing was performed along a stretch of 3592 nucleotides to obtain the amino acid sequences of both proteins. The derived primary struct…
A system of hard spherocylinders near an impenetrable wall is studied in the low-density Onsager approximation. Using a simple local approximation for the one-particle distribution function, we show that the preferred orientation of the nematic director is parallel to the wall. The density and order-parameter profiles…
Residual thermal stresses and strains, developed during cooling of a SiC whisker‐Al 2 O 3 composite, were determined by an experimental neutron diffraction technique and the results were compared with analytically determined values. High compressive residual thermal stresses were generated in the whiskers during coold…
The convolutive X-ray peak profile-fitting methodology described in the previous paper [Enzo, Fagherazzi, Benedetti & Polizzi (1988). J. Appl. Cryst. 21, 536–542] has been applied to a series of fluorite samples milled for different times and two zirconia ultra-fine powders, by using either pseudo-Voigt or Voigt (in t…
A detailed neutron-powder-diffraction experiment as a function of temperature has revealed the existence of a reversible structural transition at about 80 K in stoichiometric ${\mathrm{La}}_{2}$Ni${\mathrm{O}}_{4}$. This phase transition is characterized by the anomalous behavior of the orthorhombic strain with no app…
The stability of the phases in equilibrium is calculated for the Si‐C‐N‐O system in order to analyze and predict the reactions in ceramic whisker formation and sintering of silicon nitride composites. Equilibria among SiC, Si 3 N 4 , Si 2 N 2 O, SiO 2 , Si, and the gas phase are evaluated at different carbon activitie…
Abstract— For a variety of chemically defined, synthetic and natural porphyrins, the tendency for self aggregation, binding to serum albumin, distribution coefficient betweenoctanol–1 and water and uptake in V79 Chinese hamster cells have been determined. A strong correlation was found between cell uptake and distribu…
A wet‐chemical approach is applied to derive fine powders with compositions 11 mol% CeO 2 ‐ZrO 2 , 1 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 , 12 mol% CeO 2 ‐ZrO 2 , and 2 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 by the coprecipitation method. The characteristics of the as‐derived powders are evaluated through thermal analysis and…
Abstract Due to their unique polarity, pore-size distribution, and high surface areas, pillared and delaminated clays are potentially useful materials for the adsorption of environmental toxicants. To determine their properties for adsorption of chlorinated phenols, alumina-pillared montmorillonite (APM), chromia-pill…