Materials Literature
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In this work the potential of the Barkhausen noise technique for testing of the magnetic properties of electrical steels was studied. Different grades of nonoriented and grain oriented steels were tested in the quasi-static magnetization regime. A vertical array of three Hall sensors was used to control the sample fie…
Abstract The compatibilization effects provided by different amine‐functionalized polyethylenes (PEs) versus those provided by a maleated polyethylene (PEgMA), for forming PE‐based film nanocomposites, were studied. Amine‐functionalized PEs were prepared by reaction of PEgMA with two primary amines, 2‐aminoethanol (EA…
The uncoated magnetite and the 2, 3-meso-dimercaptosuccinic acid (DMSA)-coated Fe3O4nanoparticles were synthesized by a coprecipitation method, respectively. The DMSA surface modification on magnetite nanoparticles was observed by FT-IR. The average particle sizes of the uncoated magnetite and the DMSA coated magnetit…
Polyvinyl alcohol(PVA)/[La(NO3)3+Co(CH3COO)2] composite nanofibers were prepared by combination of sol-gelmethod and electrospinning technique, and crystalline LaCoO3 nanofibers were fabricated by calcination of thePVA/[La(NO3)3+Co(CH3COO)2] composite nanofibers at 600ºC for 10h. The samples were characterized by usin…
Electronic structures of strained Nd1−xCaxMnO3 (NCMO) thin films with x=0 to 0.8 are investigated via x-ray absorption spectroscopy (XAS). The obtained O 1s spectra within the photon energy 529–535 eV can be decomposed into eg↑1, eg↑2, t2g↓, and eg↓ bands. Based on the assigned energy levels of these band states, the…
Many works have been attempted to propose fast methods to estimate the fatigue limit of materials. Fatigue limit is a high-cycle fatigue property that can be interpreted as a stress level above which the material is subjected to an accumulation of irreversible changes currently associated to the micro-plasticity activ…
We examined the magnetocaloric effect of Co(S 1- x Se x ) 2 , which shows typical itinerant electron metamagnetism, under high pressures up to 1.2 GPa. It was found that the magnetic entropy change, Δ S M , of x =0 increases with increasing pressure, while that for x =0.05 is not sensitive to pressure. For x =0.08, Δ…
The results of an experimental investigation and calculations of the influence of bolt holes and slit edges on the packet to packet variation of flux density in a three-phase, three-limb power transformer core, tested under no load are presented. The overall peak flux density was calculated from the induced voltage in…
Sufficiently high-coverage monolayer structures of cerium oxide nanocrystals modified with decanoic acid, with sizes of ∼9 nm, were fabricated on the surface using a silicon substrate modified with 3,4-dihydroxyhydrocinnamic acid where catechol group lied at the top. By doing this, no further pretreatment for the modi…
The effects of an optical excitation on the thermoreflectance spectra of a solid are studied. A photonic excitation with sufficient energy will cause a perturbation in the electron number density around the Fermi surface. As the number density changes, so do the plasma frequency and carrier scattering rates, creating…
Abstract A novel Y‐type poly[iminocarbonyloxyethyl‐5‐methyl‐4‐{2‐thiazolylazo‐4‐(1,2,2‐tricyanovinyl)}resorcinoxyethyloxycarbonylimino‐(3,3′‐dimethoxy‐4,4′‐biphenylene)] 4 containing 5‐methyl‐4‐{5‐(1,2,2‐tricyanovinyl)‐2‐thiazolylazo}resorcinoxy groups as nonlinear optical (NLO) chromophores, which constitute part of…
Abstract SiOC films made by the inductively coupled plasma chemical vapor deposition were researched the relationship between the dielectric constant and the chemical shift. SiOC film had the main Si‐O‐C bond with the molecule vibration mode in the range of 930∼1230 cm ‐1 which consists of C‐O and Si‐O bonds related t…
A novel and simple method for gold nanoshell synthesis with controllable core and shell sizes is reported here. A new 'tree-shape' surfactant bis(amidoethyl-carbamoylethyl) octadecylamine (C18N3) was synthesized and used as the glue for the fast combination of gold nanoparticles and the subsequent gold shell outside.…
Morphological transitions such as the order-to-order transition (OOT) and the order-to-disorder transition (ODT) for an asymmetric polystyrene- block -polyisoprene (PS- b -PI) were investigated in bulk and film. The PS-rich block copolymer (BCP) bulk possessed the lamella morphology (LAM), which transformed to the gyr…
The kinetics of nanoparticle (NP) adsorption on a model biological interface (collagen) is measured in microfluidic channels using surface plasmon resonance (SPR) imaging over a range of CdSe/ZnS quantum dot concentrations to investigate the underlying binding process. Spherical CdSe/ZnS core-shell NP, derivatized wit…
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…