Materials Literature
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If an electromagnetic boundary value problem exhibits appropriate symmetry, it is possible to solve it in a lower dimensional domain. We discuss symmetries in general and in particular show how dimensional reduction is based on symmetry.
The transition from the continuously rotating dielectric ellipsoid approach to the discrete periodic collection of wave plates is investigated by comparing an exact analytic solution found using a Bloch-Lyaponov transformation on the 4x4 matrix form of Maxwell's equations and the numerical solution. The validity of th…
A copper cyclam-type complex was successfully immobilized onto mesoporous silica SBA-16. Characterization by NIR spectroscopy and TGA analysis confirmed that copper cyclam complex is immobilized onto mesoporous SBA-16. The Cu(II)-Cyclam-SBA-16 was proven to be a good catalyst for oxidation reaction of cyclohexene with…
In this paper, a phenomenological energy-based material model for ferromagnetic materials under harmonic conditions is presented. The model is based on the concept of a complex effective permeability and an accurate representation of energy is adopted as identification criteria. The material model is implemented in a…
Electromagnetic relay modeling is elaborated using a magnetic equivalent circuit (MEC). The lumped parameters of the MEC are fitted with respect to 3-D finite-element simulation by using classical optimization algorithms. An accurate dynamic material law has to be taken into account in the modeling, considering the ma…
Abstract The effects of silver (Ag) nanoparticles on the physical properties of syndiotactic PP (sPP) were investigated concentrating on the isothermal melt crystallization behavior under shear. sPP with 5 wt % Ag nanoparticles presented higher crystallization temperature ( T c ) and heat of crystallization (Δ H c ) t…
A glassy carbon electrode (GCE) modified with poly(p-aminobenzene sulfonic acid) [Poly(p-ABSA)] film is fabricated by voltammetric technique in phosphate buffer solution (pH 8.0) containing <TEX>$5.0\;{\times}\;10^{-3}\;mol\;L^{-1}$</TEX>p- ABSA. Electrochemical behaviors of tryptophan at the Poly(p-ABSA) film electro…
The dynamic hysteresis model for magnetic materials presented by Bertotti uses the classical eddy current expression, where the applied field is assumed to penetrate the material homogenously. However, for this to be valid for a material exposed to a field varying with a frequency in the kilohertz range or higher, the…
Abstract Alumina/poly(ethylene terephthalate) nanocomposites were prepared by melt compounding with a twin‐screw extruder. The melt temperature, screw rotation speed, and feed rate were selected as important processing parameters, and their effects on the degree of mixing were studied with full‐factorial, two‐level ex…
We previously reported that holes opened at the tips of conical single-graphenes of single-wall carbon nanohorns were closed during heat treatment at 1200 °C in an argon atmosphere. Here, we report phenomena related to the behavior of these holes: the holes closed quickly at first, then reopened, and then slowly close…
A series of mixed-metal supramolecular porphyrin arrays in which the geometry of the central metal-polypyridyl moiety defines the spatial arrangement of two or more Ru(II)-porphyrin units through axial coordination have been prepared by employing self-assembly based protocols, and their photophysical and electrochemic…
Single microcrystals of Li 2 CO 3 (zabuyelite) were observed on {0001} calcite surfaces, epitaxially grown and oriented along the <210> directions of calcite, the {001} form of zabuyelite being by far the best candidate to form the epitaxial interface. In addition, 3-fold pseudotwins of zabuyelite were observed in epi…
Abstract This article describes the oriented crystallization of poly( L ‐lactic acid) (PLLA) in uniaxially oriented blends with poly(vinylidene fluoride) (PVDF). Uniaxially drawn films of PLLA/PVDF blend with fixed ends were heat‐treated in two ways to crystallize PLLA in oriented blend films. The crystal orientation…
Despite the apparent relative simplicity of the wound toroidal geometry, numerical modeling techniques are very difficult to implement due to the inherent large mesh size required to model a laminated core or spiral geometry. Recent advancements in computing capabilities have made the simulation and the study of such…
A new oscillation behavior in a phase-change memory device is presented and analyzed. The device consists in a chalcogenide resistor with a parallel capacitance and no inductance. Biasing the device immediately after a proper trigger pulse leads to damped relaxation oscillations, which can be controlled in frequency b…
The paper introduces a network description of conducting regions in electrical machines. Resistance models are considered, where loop equations are equivalent to an edge element formulation using the electric vector potential T, as well as conductance models, for which the nodal equations refer to a nodal element desc…
We study orbital excitations in the optical absorption spectra of YVO 3 and HoVO 3 . We focus on an orbital absorption band observed at 0.4 eV for polarization E ∥ c . This feature is only observed in the intermediate, monoclinic phase. By comparison with the local crystal-field (CF) excitations in VOCl and with recen…
An understanding of the polarization characteristics is vital to the rational design of future dielectric nanostructures. In this work, a finite-element methodology has been applied to simulate 2-D two-phase heterostructures containing a dielectric inclusion with arbitrary shape. The development does not impose any re…
Different oxidizing and reducing agents can be separated by a solid polymer membrane, but they still react. The possibility to conduct this type of transmembrane redox reactions coupled with electroneutral electron/chloride countertransport is demonstrated here for polyaniline (PANI) membrane doped with camphor sulfon…
A generalized Preisach description of hysteretic magnetotransport properties of half-metallic ferromagnets (HMFs) is proposed. Assuming that the system consists of an assembly of elementary bistable hysterons distributed in energy levels and with a range of possible energy barriers, the connection between irreversible…