Materials Literature
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This paper reapproaches the very classic problem of the analytic study of nonlinear diffusion of electromagnetic fields in conducting media. Significant contributions that appeared in the literature on this topic are cited in order to highlight the interest and the efforts provided by the scientific community on this…
In this study, the adsorbents Cu+-3SiPPH723 and Cu2+-3SiPPH723 were prepared starting from a silica-expanded zirconium phosphate heterostructure, 3SiPPH(0.2), which was subjected to an ion exchange with Cu(I) and Cu(II). These materials were characterized using powder X-ray diffraction, X-ray photoelectron spectroscop…
The effect of space charge accumulated in insulation cavities on partial discharge activity is dealt with in the paper. Partial discharges were measured on non-polarized and DC-polarized XLPE specimens. In order to characterize space charge distribution, pulsed-electroacoustic (PEA) space charge measurements were also…
A one-step hydrofluoric-acid-free hydrothermal-etching technique is demonstrated for the preparation of porous silicon with vertical holes. This method demonstrates a “green” chemical approach for etching a silicon wafer or the preparation of bismuth-silicon nanostructures without toxic acid or applying an external vo…
Space charge and DC electric field characteristics have been investigated on medium voltage size models of cable joints composed of cross-linked polyethylene (XLPE) and ethylene-propylene rubber (EPR). The joint models were constructed in such a way that the dielectric interface between XLPE and EPR was identical to t…
This paper presents a new prediction method for the level of the fundamental component of leakage current in the early aging period. Several silicone rubber (SIR) insulators were tested in salt-fog chamber and the LC was continuously recorded, A neural network has been used to predict the level of LC in the early stag…
The present work illustrates the effect of the different heating rates on the intensity and peak area of thermoluminescence (TL) glow peaks. In this work, we suggest that the kinetic equations for the TL intensity in their time-dependent forms I ( t ) are not adequate for comparison with experimental results I ( t ),…
A shell model has been developed and used in a study of the lattice dynamics of hydroxyapatite. The results give insight into the modes of vibration of the lattice, but in addition, the dynamics has been used to obtain quantities involved in x-ray and neutron diffraction patterns and in infrared spectra to help in the…
This paper presents the control performance of a novel type of single-link mechanism activated by shape memory alloy (SMA) springs. After briefly describing the configuration of the proposed mechanism, the governing equation of motion is derived using a Lagrangian equation. The actuator dynamic of the SMA spring is th…
In Brief Piezoelectric sensors have been shown to respond reproducibly to changes in tissue mechanical properties surrounding an implant over a 4-month period. The vibrational amplitude at a frequency corresponding to the radial resonance shows a statistically significant change over time. The initial period of inflam…
A simple form of a SPICE macro model for a generic phase-change random access memory device is presented. The approach is based upon lumped parameter multiple level models. The SPICE implementation is described using a series of increasingly complex modeling blocks for dc to transient analysis. The effect of nonlinear…
The reliability of the Derjaguin approximation for the calculation of the mixing term between sterically stabilized colloidal particles is studied. For this purpose, the steric potential obtained from the experiment of Doroszkowski and Lambourne [J. Polym. Sci., Part C: Polym. Symp. 34, 253 (1971)] is regarded as an e…
The adsorption behavior of PHB depolymerase from R. pickettii T1 on a silicon wafer and on P(3HB) single crystals has been studied by real-time and AFM in air and a buffer solution. First, the morphology of PHB depolymerase adsorbed on a silicon wafer was characterized to show that one molecule of PHB depolymerase has…
Abstract Summary: Interfacial adhesion between fibers and matrix is a crucial factor for effective stress transfer from matrix to fiber; especially in short fiber reinforced composite systems. The use of a chemical compatibilizer is an efficient means to achieve such adhesion. Maleic anhydride‐grafted‐cellulose acetat…
Wave-function-based ab initio calculations on the lowest states of the 4f(n),4f(n-1)5d(t2g)1, and 4f(n-1)5d(e(g))1 configurations of (LnCl6)3- clusters (Ln=Ce to Tb) embedded in the cubic elpasolite Cs2NaYCl6 have been performed, in an attempt to contribute to a comprehensive understanding of the 4f-->5d excitations o…
Pseudoelasticity of shape-memory alloys has been commonly associated with reversible austenite-martensite phase transformation characterized by diffusionless, shear-induced atomic rearrangement. In situ heating nanoindentation and transmission electron microscopy results of this study demonstrate that martensitic TiNi…
Vanadium oxide was deposited on mesoporous titania by the molecular designed dispersion method to investigate the potential properties of these catalysts. Mesoporous titania was synthesized following the evaporation-induced self-assembly (EISA) method with a subsequent treatment with ammonia to increase the thermal st…
A development is presented that allows the simulation of reciprocal-space maps (RSMs) of epitaxic thin films exhibiting fluctuations in the size and shape of the crystalline domains over which diffraction is coherent (crystallites). Three different crystallite shapes are studied, namely parallelepipeds, trigonal prism…
It has been shown by several groups that the mechanical and electrical behavior of composites changes quite substantially, and often beneficially, when the filler particle size is less than 100 nm in diameter. There is also good reason to believe that the interface between the embedded particulates and the polymer mat…
For brittle cleavage under Load Mode I, a model for single crystals is presented which derives the critical stress in terms of the cleavage energy and the uniaxial elastic modulus. The model parameters are determined by fitting to results of ab initio density functional calculations. The crucial concept for establishi…