Materials Literature
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Substituted Li ferrites with chemical composition Li0.5+0.5t-0.5xFe2.5-1.5t-0.5xTitZnxO4, wherex= 0.20 andt= 0.35, 0.45, 0.55 with additions of 0.005 Bi2O3and 0.05 MnO2were synthesized by ceramic method and from solutions of metallic salts and citric acid. The intrinsic and extrinsic magnetic properties were measured…
This paper deals with the analytically described iron core model of a midfrequency resistance spot welding transformer. This model considers eddy currents, hysteresis, and the saturation effect in a laminated iron core. The proposed model is simple, based on parameters that can be obtained from a data sheet, and is ea…
We investigate the role of local force balance in the transition from a microcanonical ensemble of static granular packings, characterized by an invariant stress, to a canonical ensemble. Packings in two dimensions admit a reciprocal tiling, and a collective effect of force balance is that the area of this tiling is a…
Most of the papers in the literature dealing with magnetic losses present results obtained with flux metric methods. But those techniques of measurement are known to be inaccurate when the voltage and current probes of the device introduce a significant phase shift at high frequencies. As a consequence, it is importan…
Photovoltaic response from semiconducting single-walled carbon nanotubes/n-type GaAs heterojunctions has been investigated. We propose a detailed device model of the photovoltaic cell, in which electron transport can be described as follows. The thermionic emission and tunneling through the spike barrier caused by the…
The magnetic field analysis results on grain-oriented silicon steel sheet and nongrain-oriented silicon steel sheet by the isotropic method, the two-axis isotropic method, the two-axis anisotropic method, the ¿ anisotropic method, and the ¿HBanisotropic method, which are 2-D magnetic analysis methods, are compared. In…
We report a first-principles investigation of transport through longitudinal unzipped carbon nanotube based devices. The graphene nanoribbons can be obtained experimentally by unzipping carbon nanotubes in the longitudinal direction. The basic component of our devices is partially unzipped carbon nanotube that consist…
The electroluminescence from an n-MgZnO/i-ZnO/MgO/p-GaN asymmetric double heterojunction has been demonstrated. With the injection of electrons from n-MgZnO and holes from p-GaN, an intense ultraviolet emission coming from the ZnO active layer was observed. It is revealed that the emission intensity of the diode recor…
An experimental investigation has been performed to study the efficiency of NO reduction by three technological approaches: reburning by methane, selective noncatalytic reduction (SNCR) by ammonia, and a hybrid approach by coupling reburning and SNCR. Experiments were performed on a lab-scale reactor equipped with a M…
Abstract The effect of network formation on the secondary (Johari–Goldstein) β‐relaxation was investigated for polyvinylethylene (PVE). Crosslinking affects the segmental (α‐) process in the usual fashion, the networks exhibiting slower and more temperature‐sensitive dynamics. However, the effect on the β‐process is t…
Burr-induced interlamination shorts in magnetic circuits increase eddy current loss. In large transformer cores, the short-circuit currents can become so high as to even damage the core. This paper presents contributions to modeling an individual short circuit between two transformer sheets. The aim of the model is to…
Ferromagnetic resonance was used to study the influence of temperature and film thickness on magnetic properties of Ni–Mn–Ga films deposited on single crystal MgO(001) substrates. It has been shown that depending on the film thickness and preparation condition, three configurations of magnetic anisotropy can be realiz…
Here, we report on a magnetoelectric (ME) coupling in a simple piezoelectric unimorph bender induced by the eddy currents within the silver electrodes of the piezoelectric ceramic Pb(Zr,Ti)O3 (PZT) subjected to ac magnetic flux. Eddy currents and the applied magnetic field generate Lorentz forces in the metal electrod…
This study investigates the bistable effect and transition mechanism between various lattice orientations in the negative liquid crystal blue phase. The blue phase exists over a wide temperature range ∼16 °C, and three lattices (110), (112), and (200) are confirmed with Kossel diagrams. The red platelet (110) lattice…
A remarkably simple viscoelastic relaxation pattern was found for a physical gel that, beyond its gel point, slowly ripens toward a stable structural state. The material is a nanocomposite that consists of two components, an organoclay and an end-functionalized polymer, which get mixed at prescribed ratio. When freshl…
Abstract A series of thermotropic liquid crystalline polyesters containing phosphorus and aromatic ether groups (TLCP‐AEs) were synthesized from p ‐acetoxybenzoic acid ( p ‐ABA), terephthalic acid (TPA), 4,4′‐oxybis(benzoic acid) (OBBA), and acetylated 2‐(6‐oxid‐6H‐dibenz(c,e) (1,2) oxaphosphorin 6‐yl) 1,4‐benzenediol…
Abstract A novel method using Cu(AC) 2 · H 2 O and dimethylglyoxime as reagents has been successfully developed for the controllable synthesis of Cu 2 O microcrystals with distinctive morphologies, including porous hollow microspheres, octahedral microcages, and microcrystals with truncated corners and edges and octah…
Ab initio spin-polarized density functional calculations have been performed on mixed-sandwich clusters V(n)Bz(m)Cp(k) (n = 1-3, m + k = n + 1, Bz = benzene, Cp = cyclopentadienyl) to study their size-dependent and composition-dependent structural, electronic, and magnetic properties. All of the mixed-sandwich cluster…
Porous anodic alumina (PAA) has been intensively studied in past decade due to its applications for fabricating nanostructured materials. Since PAA's pore diameter, thickness and shape vary too much, a systematical study on the methods of morphology characterization is meaningful and essential for its proper developme…
The structural, magnetic, lattice, and electronic transport properties of Mn3SnCx compounds were investigated. Variation in carbon content from 0.6 to 1.2 does not change the crystal structure. With the increasing of x, the magnetic order changes from antiferromagnetic to ferromagnetic, and the transition temperature…