Materials Literature
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We investigated the electrical and magnetic properties of cobalt-substituted manganese-zinc soft ferrite by using the equivalent lumped elements acquired from the appropriate equivalent electrical circuit of polycrystalline ferrite. We applied the equivalent lumped circuit, combined with equivalent lumped resistances…
We demonstrate the broadband optical amplification in bismuth-doped strontium germanate glass with 808 nm and 980 nm laser diodes (LDs) as excitation sources. The net optical gain has been obtained within the wavelength region of 1272 to 1348 nm with 808 nm laser diode under 0.97 W power. The maximum gain and gain coe…
The triple-level data storage capability of the phase change memory with doublelayer chalcogenide films (Sb2Te3 and Ge2Sb2Te5) was investigated. Differences in physical properties of these two chalcogenide materials contribute to the appearance of a median resistance state. However, the stable median resistance state…
We report on experiments and theory of resonant tunneling anisotropic magnetoresistance (TAMR) in AlAs/GaAs/AlAs quantum wells (QW) contacted by a (Ga,Mn)As ferromagnetic electrode. Such resonance effects manifest themselves by bias-dependent oscillations of the TAMR signal correlated to the successive positions of he…
A facile and reproducible approach for the synthesis of magic-sized CdSe and CdTe nanocrystals is established. The as-synthesized CdSe nanocrystals exhibit strong and fixed absorption features with unusually narrow emission spectra. White-light emission can be achieved by two different routes. One is to mix colours em…
We present the design, growth, fabrication, integration and characterization of alternative hybrid white light sources based on the controlled layer-by-layer assembly of nanocrystals on UV-emitting nitride diodes for adjustable white light parameters. We hybridize CdSe/ZnS core–shell nanocrystals of different sizes (1…
This study was conducted to investigate the effect of sequential and direct detergent methods on the monosaccharide composition of acid detergent residues in three fi brous feedstuffs (lignifi ed, highly digestible and highly pectic). The result indicated that the contents of ADF and cellulose determined by the sequen…
The role played by the alpha-helix in determining the structure, the stability and the unfolding mechanism of azurin was addressed by studying a helix-depleted azurin variant produced by site-directed mutagenesis. The protein structure was investigated by CD, 1D (1)H NMR, fluorescence spectroscopy measurements and MD…
The capture of an electron by a silicon atom in a defect-free bulk of amorphous silica $(a\text{\ensuremath{-}}{\mathrm{SiO}}_{2})$ has been investigated. Ab initio constrained dynamics has been applied to evaluate the energy barrier. The computed energy barrier involved in the mechanism was found to be $0.23\phantom{…
Macromolecule-protected sub-micrometer polyhedral gold nanocrystals have been facilely prepared by heating an aqueous solution containing poly (N-vinyl-2-pyrrolidone) (PVP) and HAuCl4 without adding other reducing agents. Scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), ultraviolet-visib…
Rapid synthesis of sodium‐substituted lanthanum manganite phases is reported by the solution combustion method using oxalyl dihydrazide (ODH), as fuel. As‐synthesized compounds are amorphous in nature; crystallinity was observed on heating at 800°C for 5 min. Structural parameters were determined by the Rietveld refin…
We propose an approach to allocate and delimit a region in which the rotational losses are of most importance in the stator core of induction motors. The delimitation is based on the analysis of points at which the minimum flux density is not null. The analysis of flux paths and values of flux density over a number of…
Abstract 1,2‐Bisthienylperfluorocyclopentenes covalently linked to two aggregative side‐arms derived from 11‐aminoundecanoic acid have been designed to self‐assemble leading to the formation of supramolecular gels which could be reversibly and independently revealed or suppressed upon acidity, temperature changes and…
Energy dispersive extended X-ray absorption fine structure spectroscopy (ED-XAFS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS), have been combined for the structure-function study of Rh and RhPd supported catalysts for the reduction of NO by CO. The combined results…
The on-off optical gain measurements as a function of the pump power were performed on porous silicon planar waveguides codoped by erbium and ytterbium ions. These measurements were obtained for different ratios of Yb concentration to Er concentration. The highest value of the gain was reached when the Yb concentratio…
The Aharonov-Bohm effect on optical absorption of light polarized perpendicularly to the tube axis in semiconducting carbon nanotubes is studied by taking account of exciton and depolarization effect within an effective-mass approximation. The excitation energy and oscillator strength exhibit weak and quadratic depend…
Abstract The crown‐ether functionalized 2‐( N ‐acetyl‐ N ‐arylaminomethylene)benzo[ b ]thiophene‐3(2 H )‐ones exhibit photochromic behavior involving photoinitiated Z/E ‐isomerization around the exocyclic CC bond followed by a fast thermal N → O acetyl migration and syn → anti isomerization of the resulting kinetical…
Oriented polycrystalline BiFeO3 (BFO) films are deposited on single crystal LaAlO3 (001) substrates by nebulized spray pyrolysis technique at low temperature of ∼300°C. Annealing of the as deposited films in air and oxygen at ∼550°C for 1h is found to produce crystallization and BFO phase formation. X-ray diffraction…
High-voltage vacuum insulator failure is generally due to surface flashover rather than insulator bulk breakdown. Vacuum surface flashover is widely believed to be initiated by a secondary electron emission avalanche along the vacuum-insulator interface. This process requires a physical mechanism to cause secondary el…
This study reports the design, fabrication, and characterization of a tachometer utilizing magnetoelectric (ME) laminate composites with sandwich structure consisting of Pb(Zr,Ti)O3 (PZT) and Galfenol. High temperature characterization of Galfenol shows that it can sustain the magnetic property over 500°C. The Curie t…