Materials Literature
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The effect of additions on the magnetic properties of MnZn ferrites for high frequency power supplies was studied. The investigation revealed that various combinations of dopants added to the ferrite modify the grain boundary resistivity and the magnetic permeability spectra at constant microstructure. Particularly, t…
High-resolution X-ray diffraction experiments were performed on a single crystal of PMN in the temperature range of 90-300 K, by applying an electric field (up to E = 3.0 kV cm-1) along the [111] direction. A first order electric field-induced phase transition, from the mean cubic phase to a rhombohedral Phase, was ev…
The Nakamura equation is used to generate a direct relation (first-order differential equation) between the Avrami and Ozawa crystallization rate constants. As a result, it is possible to compare isothermal and constant-cooling-rate crystallization data in a consistent manner. This is done for isotactic polypropylene…
Abstract A novel process for the industrial production of hydroxylated fatty acids involves epoxidation of plant oils and their derivatives, followed by catalytic epoxy ring opening in the presence of water or other hydrogen donors, such as alcohols, diols, and amines. Depending on the starting material, epoxidation f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of CO2 with Magnesium Oxide Surfaces: a TPD, FTIR, and Cluster-Model Calculation StudyY. Yanagisawa, K. Takaoka, S. Yamabe, and T. ItoCite this: J. Phys. Chem. 1995, 99, 11, 3704–3710Publication Date (Print):March 1, 1995Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-Bonding-Mediated Generation of Side Chain Liquid Crystalline Polymers from Complementary Nonmesogenic PrecursorsS. Malik, Pradeep K. Dhal, and R. A. MashelkarCite this: Macromolecules 1995, 28, 7, 2159–2164Publication Date (Print):March 1, 1995Publication History Pu…
A dramatic change occurs in the electronic spectrum of a thin (solid) film of polyaniline doped with the “primary dopant,” d,l-camphorsulfonic acid (spun from its solution in chloroform on to a quartz plate) when it is exposed to the vapor of the “secondary dopant” m-cresol, at room temperature. The resistance decreas…
The structure of an end-grafted polymer layer immersed in poor solvent is investigated through Monte Carlo simulation based on Edward's Hamiltonian. When the solvent quality becomes sufficiently poor, lateral inhomogeneities are observed to develop in the monomer density in the direction parallel to the grafting plane…
The charge transport and storage mechanisms in π‐doped oligothiophenes can be better understood through a more profound knowledge of their optical excitations. These materials have been investigated using a quantum‐chemical approach, results which can also be applied to the interpretation of the experimental data repo…
A novel method of preparing low-density microporous polymeric foam materials has been utilised to produce media which are effective in crossflow microfiltration applications. Polyhipe polymer (PHP) is produced by the polymerisation of a high-internal-phase emulsion (HIPE), resulting in a homogeneous, highly porous, lo…
A constitutive equation for a planar fiber network under transverse compression is derived allowing for an in-plane fiber orientation distribution. The fibers are assumed to be well dispersed in space and to have a large aspect ratio and uniform diameter. A compression experiment, performed on a glass-fiber network ob…
This communication describes our results using these novel alkoxysilane precursors for PECVD of SiO_2 films in an inductively coupled rf plasma reactor. The effects of deposition time, rf power, and organosilane pressure on the films’ characteristics are described.
Lanthanum-modified lead zirconate titanate (PLZT) specimens with La contents x between 0 and 5 at. % and a Zr/Ti ratio of 95/5 (PLZT x/95/5) have been investigated by dielectric spectroscopy, Sawyer-Tower polarization (P-E) measurements, and hot-stage transmission electron microscopy (TEM). The dominate phase of PLZT…
Experimental results on the dynamics of a beam constrained by shape memory wires are presented. It is observed that the damping increases significantly when the shape memory wires are stressed such that they lie within the pseudoelastic hysteresis loop. Theoretical models of the inner hysteresis loop are considered, a…
The poles and zeros of the scattering operator of a corrugated waveguide and of a bare grating are studied mathematically and numerically. An initial tutorial section recalls how their use can explain grating anomalies and other curious phenomena in linear optics. This approach is then used in nonlinear optics to unde…
A new computer simulation technique for modeling morphological pattern formation during nucleation, growth, and coarsening of coherent misfitting particles is developed. Microstructure evolution during precipitation of tetragonal phase from Mg‐partially‐stabilized cubic zirconia is investigated. Our computer simulatio…
The photoionization of ${\mathrm{Ti}}^{3+}$ in sapphire \ensuremath{\alpha}-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ was studied by means of one-step and two-step photoconductivity measurements. An absorption band of ${\mathrm{Ti}}^{3+}$ at 2700 \AA{} was shown to be due to a ${\mathrm{Ti}}^{3+}$ localized exciton. One-p…
This 3rd edition of High Voltage Engineering Testing describes strategic developments in the field and reflects on how they can best be managed. All the key components of high voltage and distribution systems are covered including electric power networks, UHV and HV. Distribution systems including HVDC and power elect…
Melamine has shown broad utility as a flame retardant in plastics although its commercial use to date as a flame retardant additive has been principally in coatings and flexible urethane foams. Its mode of action appears to involve endothermic sublimation and vapor-phase dissociation, but it also undergoes conversion…
A developed strict kinetic model for the growth of porous anodic films was employed to the experimental results obtained at different bath temperatures and current densities of Al anodization. Treatment of the values of parameters involved in the kinetic equation showed that the pore/cell surface density depends only…