Materials Literature
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For the insulation diagnosis of gas-insulated switchgears, the UHF method, which detects electromagnetic wave (EM-wave) in the UHF band (300 MHz to several GHz) with little noise influence, has rapidly developed in recent years. The study in this paper has proposed the evaluation of the location of adhering metallic p…
This paper reviews recent developments in nonlinear control technologies for shape memory alloy (SMA) actuators in robotics and their related applications. SMA possesses large hysteresis, low bandwidth, slow response, and non-linear behavior, which make them difficult to control. The fast response of the SMA actuator…
The electrical properties of 1 mol% Ca‐doped LnTaO 4 (Ln=La, Nd, Gd, Er) have been characterized by AC impedance spectroscopy and by the EMF transport number technique as a function of the oxygen pressure and the water vapor pressure from 300° to 1200°C. Protons, oxide ions, electron holes, and electrons contribute to…
BiFeO 3 (BFO) thin films were fabricated on Pt(111)∕Ti∕SiO2∕Si substrates by using a polymeric precursor solution under appropriate crystallization conditions. The capacitance dependence on voltage is strongly nonlinear, confirming the ferroelectric properties of the films resulting from the domain switching. The leak…
A preliminary study of the electromagnetic shielding effectiveness (EMSE) using metal coating films and a vacuum evaporation deposition technique with the woven fabrics made of metal/PET filaments is presented. Using coaxial transmission equipment, the EMSE of these films and fabrics was measured in the frequency rang…
A convenient method for the direct and large-area growth of one-dimensional (1-D) ZnO nanostructures on a conductive brass substrate has been developed, consisting of thermal oxidation of a Cu 0.66 Zn 0.34 alloy foil in the presence of oxygen. Various 1-D nanostructures such as nanowires, nanobelts, nanocombs, and nan…
The magnetic hysteresis phenomenon plays an important role in the ferroresonance behavior of a transformer. However, most existing transformer models for the analysis of the ferroresonance phenomenon either ignore the hysteresis effects or represent it based on the hysteresis major loop and scale it for lower current…
Wetting experiments in PET/polar liquid systems performed at 25 °C in air have shown that the values of contact angle measured one day after PET treatment with He and He/O2 plasmas decrease significantly compared to the untreated PET. Higher oxygen content in the He plasma improves wetting, whereas the substrate bias…
We describe here a novel method which shows that related large molecules, tannic acid, can control the morphology of silver/gold nanoparticles, resulting in the formation of multi-pod-shaped nanostructures. In this work, multi-pod-shaped gold/silver nanostructures have been synthesized using tannic acid as a reducing…
The transitions of partial discharge (PD) behavior with aging in a void under ac voltages with sine wave and square wave were observed. The transition of the PD magnitude with aging under square wave showed the same tendency as that under sine wave. Moreover, the experimental results also showed some distinctive chara…
Syntheses and properties of aliphatic and aromatic polythioesters (PTEs) were reviewed including polythiocarbonates and polythiourethanes. The content is subdivided into the following sections: PTEs of aliphatic α‐mercapto carboxylic acid, PTEs of ω‐mercapto carboxylic acids, PTEs derived from α,ω‐dimercapto alkanes,…
Sintering in air of a commercially available granulated zirconia powder has been investigated using vertical dilatometer tests. Using several heating rates and the formalism of the constant rate of heating method, it has been possible to determine the apparent activation energy for the mechanism controlling densificat…
A theory of yielding and failure for homogeneous and isotropic materials is given. The theory is calibrated by two independent, measurable properties and from those it predicts possible failure for any given state of stress. It also differentiates between ductile yielding and brittle failure. The explicit ductile-brit…
The need to simultaneously reduce vehicle emissions and increase the safety of passengers is encouraging the automotive industry to incorporate new technologies and materials into today's vehicles. To remain competitive, the steel industry has developed steel grades with increased energy absorbing properties allowing…
A thickness dependent nano-crystallization in ultra-thin Ge 2 Sb 2 Te 5 films was studied by in-situ exothermal and isothermal electrical resistivity measurements. When the film thickness is below 20 nm, an exponential increase of the crystallization temperature with decreasing film thickness was found. Furthermore, t…
Merits and demerits of existing methods of hydrogen storage are discussed. Special attention is given a metal hydride technology based on the ability of metals, intermetallic compounds, and alloys for reversible reaction with hydrogen. It is noted that the basic advantages of metal hydrides are a high volumetric hydro…
Nanoparticles are becoming increasingly important in many areas, including catalysis, biomedical applications, and information storage. Their unique size-dependent properties make these materials superior. Using the Atomic Force Microscope (AFM), individual particles and groups of particles can be resolved and unlike…
Increasing worldwide environmental awareness is encouraging scientific research into developing cheaper, more sustainable materials. Industrial hemp fiber is one of the strongest and stiffest available natural fibers [K. L. Pickering, M. Priest, T. Watts, G. Beckermann, and S. N. Alam, J. Adv. Mater. 37, 15 (2005) ] a…
The creep behavior of Hi‐Nicalon, Hi‐Nicalon S, and Tyranno SA3 fibers is investigated at temperatures up to 1700°C. Tensile tests were carried out on a high‐capability fiber testing apparatus in which the fiber is heated uniformly under vacuum. Analysis of initial microstructure and composition of fibers was performe…
A new boundary-integral method is proposed to study the deformation of drops between two parallel walls. The free-space Green’s functions are extended to obey the no-slip condition at the walls. The current formulation is limited to drops with viscosity equal to the matrix fluid, but can be extended to study the effec…