Materials Literature
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Inrush currents have undesired effects on transformers when these ones are, for example, switched into service. Theses effects have to be taken into account when designing a transformer, what leads to a constraint on its magnetic core and size definition. This paper investigates the modeling of inrush currents in a th…
A self-supported device with tunable reflective properties in the IR was elaborated from the association of a poly(ethylene oxide) (PEO) network, poly(3,4-ethylenedioxythiophene) (PEDOT), and an ionic liquid, 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)imide (EMImTFSI). First, the PEO matrix was optimized…
Photoelectron spectra and angular distributions in photodetachment of gold hydride anions AuH(-) and Au(2)H(-) have been obtained using photoelectron velocity-map imaging. Both the images exhibit vibrationally resolved ground state transitions. The adiabatic electron affinities of AuH and Au(2)H are measured to be 0.7…
The inclusion of eddy currents in electrical steel sheets in a two-dimensional (2-D) finite element analysis is studied. For the eddy-current modeling of the sheets a so-called one-dimensional (1-D) approach is applied. Two different techniques for representing the 1-D eddy-current solution within the 2-D field equati…
Two novel series of codendrimers constituted by the grafting of poly(propylene imine) PPI-(NH 2 ) 16 ( G = 3) with aromatic acids substituted with fluorinated and perhydrogenated chains in different proportions have been synthesized and their liquid crystalline properties have been investigated. Series I is generated…
A three-dimensional (3D) transient finite element analysis (FEA) approach taking into account the effects of steel lamination core loss is proposed. When using the T-Ω method, the effects of lamination core loss are considered by introducing an additional field component in lamination regions, which is derived from th…
Aqueous foams present an anomalous macroscopic viscoelastic response at high frequency, previously shown to arise from collective relaxations in the disordered bubble packing. We demonstrate experimentally how these mesoscopic dynamics are in turn tuned by physico-chemical processes on the scale of the gas-liquid inte…
Ultraviolet photodepletion spectra of dibenzo-18-crown-6-ether complexes with alkaline earth metal divalent cations (A(2+)-DB18C6, A = Ba, Sr, Ca, and Mg) were obtained in the gas phase using electrospray ionization quadrupole ion-trap reflectron time-of-flight mass spectrometry. Each spectrum exhibits the lowest ener…
A main limitation of most models describing the effect of stress on the magnetic behavior is that they are restricted to uniaxial, tensile or compressive, stress. An idea to overcome this strong limitation is to define a fictive uniaxial stress, the equivalent stress that would affect the magnetic behavior in a simila…
This paper studies the effects of iron losses on the magnetic field solution and evaluates their impacts on the overall performance of electrical machines. Because of the complications associated with the inclusion of iron losses into the magnetic field solution, the losses are usually omitted from the finite-element…
Abstract A wet‐chemical method was presented for preparation of spherical, flowerlike, hexagonal, and triangular microsized silver crystals. Well‐defined particles were prepared by mixing of iron(II) sulfate heptahydrate solution with silver nitrate solution at the presence of different modifiers with high‐speed stirr…
This paper deals with the modeling and design of magnetostrictive devices in dynamic regime. It starts from an approach which couples a physical model of the magnetostriction with a finite-element electromagnetic field analysis of the entire device. A first study, previously published by the authors and developed unde…
We have investigated adenine and guanine functional PGMAAdenine and PGMAGuanine as proton-conducting bioinspired membranes. Poly(glycidyl methacrylate) (PGMA) was prepared by free-radical polymerization and then modified with adenine and guanine molecules via ring opening of the epoxide ring. The complexed structure o…
In this paper, the effect of different excitation patterns on both the iron loss and flux inside solid magnetic steel plates and laminated silicon steel sheets is investigated. Some practical approaches to nonlinear and anisotropic eddy-current problems under 3-D excitation conditions are proposed, in which the usual…
We report an extensive study on the intrinsic bulk electronic structure of the high-temperature superconductor ${\text{CeFeAsO}}_{0.89}{\text{F}}_{0.11}$ and its parent compound CeFeAsO by soft and hard x-ray photoemissions, x-ray absorption, and soft x-ray emission spectroscopies. The complementary surface/bulk probi…
This paper presents a 2-D finite-element model to analyze the iron losses in a three-phase transformer. In this model, the effects of nonlinear core behavior are taken into account by means of a vector hysteresis model incorporated in the finite-element formulation by using a magnetic differential reluctivity tensor.…
ZnO nanorods were functionalized with new block copolymers containing a hole transporting moiety in one block and a dye and an anchor system in the second block. After functionalization, the ZnO nanorods are well dispersible in organic media and the fluorescence of the dye is quenched. Kelvin probe force microscopy wa…
The relationship between molecular structure and gelation ability was investigated for a series of pyridine-based compounds. Nineteen compounds were synthesized and screened for gelation. Of these, eight were discovered to be gelators for a variety of organic solvent/water combinations. Solubility studies on the bulk…
We design and characterize spherical gold nanoparticles, which are covalently linked to and completely covered by 3(10)-helical peptides. These helices provide a scaffold to place (13)C=O isotope labels at defined distances from the gold surface, which we employ as local thermometers. Probing these reporter groups wit…
It is known that single-walled carbon nanotubes (SWNTs) strongly absorb light, especially in the near-infrared (NIR) region, and convert it into heat. In fact, SWNTs also have considerable ability to convert heat into electricity. In this work, we show that SWNT sheets made from as-grown SWNT arrays display a large po…