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Abstract The predictive and correlative capabilities of two recent versions of the free‐volume theory for self‐diffusion in polymer–solvent systems are examined by comparisons with experimental data. Neither the Vrentas–Duda free‐volume theory nor the Paul version generally provides satisfactory predictions for the te…
Abstract not Available.
The concepts of interface and interphase inhibition as two different types of corrosion inhibition mechanisms are discussed briefly. Most of the studies reported in the literature have dealt with interface inhibition in acid media. Experimental results of interphase inhibition have been obtained for a 4340 steel rotat…
Various domain-growth mechanisms in phase-separating binary fluids are discussed. A tube hydrodynamic instability for concentrated mixtures is studied through a linear stability analysis. A quantitative discussion of the three-dimensional linear growth law is given. For two-dimensional concentrated mixtures we argue t…
Ellipsometry was used to study the electrodeposition of polymer films formed by oxidation of bipyrazine, polyvinylferrocene, and aniline. For polymeric films of limited thickness displaying good optical characteristics ( i.e. , high reflectivity, uniform coverage, and homogeneity), the film refractive index and thickn…
The mode-coupling theory of the glass transition recently presented by Leutheusser is generalized so that some of the important wave-number dependence neglected in his theory is taken into account. As a consequence the correlation functions which appear in the theory presented here involve a continuous range of relaxa…
We have investigated the magnetic properties of the Nd2(Fe1−xCox)14B system to improve the thermal properties of the Nd-Fe-B magnets. Nd2(Fe1−xCox)14B exists in the tetragonal form in the entire range of 0≤x≤1. In this system, the replacement of Fe by Co significantly increases the Curie temperature. The room-temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of rate constants for photoinduced charge separation and dark charge recombination on the free energy of reaction in restricted-distance porphyrin-quinone moleculesMichael R. Wasielewski, Mark P. Niemczyk, Walter A. Svec, and E. Bradley PewittCite this: J. Am. Che…
We have produced fully oriented highly crystal 1ine trans-(CH)X films, which exhibit dramatic polarization effects for light polarized parallel or perpendicular to the oriented (CH)X-chains. The polarization behavior in the vicinity of the bandgap and of the characteristic IR-modes, including those which are introduce…
The chemical potential of a fluid can be determined in a Monte Carlo simulation by gradually turning on or off the interaction of one particle with the other particles. This method, which can be employed at densities where a direct use of the Widom formula is impractical, has been tested on a two-dimensional fluid of…
We have studied the magnon and phonon spectra of R${\mathrm{FeO}}_{3}$ crystals with R${=\mathrm{}}_{39}$Y, $_{65}\mathrm{Tb}$, $_{66}\mathrm{Dy}$, $_{67}\mathrm{Ho}$, and $_{69}\mathrm{Tm}$. The temperature dependence of q\ensuremath{\rightarrow}\ensuremath{\sim}0\ensuremath{\rightarrow} magnons is examined near the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal and oxidative degradation of poly(methyl methacrylate) molecular weightTakashi Kashiwagi, T. Hirata, and J. E. BrownCite this: Macromolecules 1985, 18, 2, 131–138Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue…
The evidence for the presence of the pyrrole moiety in electro-chemically prepared polypyrrole is reviewed together with structural and IR data obtained for the crystalline dimer and trimer of pyrrole. The modification of the mechanical properties of polypyrrole by formation of graft copolymers with polystyrene, by po…
The ability of small drops or bubbles to stick to non-horizontal solid surfaces is analysed. The principal results consist of identifying the critical value of the volume of a drop (or bubble) beyond which it will dislodge and move down (or up) the surface of the solid, and determining the speed at which it will move.…
Tourmaline, a mineral often overlooked in petrological studies, is shown to be a useful petrogenetic indicator mineral.-J.A.Z.
A new direction in the field of x-ray optics is discussed. This new direction is associated with diffraction at grazing angles of incidence and diffraction; it is associated with the excitation of x-ray surface waves and quasiwaveguide modes, and with the study of the angular and energy dependences of the reflection s…
Influence of structure defects on the internal optical strength of KDP single crystals, V V Azarov, L V Atroshchenko, Yu K Danileĭko, M I Kolybaeva, Yu P Minaev, V N Nikolaev, A V Sidorin, B I Zakharkin
Based on the analysis of higher-order Laue zone diffraction by Bird (1985), the structure of the commensurate superlattice state of 2H-TaSe 2 is determined by convergent-beam electron diffraction. It is shown that the most general displacements allowed by the orthorhombic space group can be described by a set of displ…
This article discusses some basic principles that underlie design of effective armour materials against various modes of attack.
Auger satellites have been measured to determine the probability of $M$-shell excitation accompanying $K$-shell photoionization of Ar, as a function of photon energy. The theoretically predicted difference between the dependence of shakeup and shakeoff probabilities on the photon energy near threshold is demonstrated…