FePt nanoparticles with thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles are prepared by chemical synthesis and a salt-matrix annealing technique. Structural and magnetic characterizations confirm the phase transition from the disordered face-centered cubic structure. In this paper, 3 nm FePt nanoparticles are first synthesized by superhydride re...

A heterogeneous catalyst containing manganese Schiff base complex (derived from 2,4-dihydroxybenzadehyde and 1,2-phenylenediamine) is produced by covalent anchoring in MCM-41 matrix. The synthesized catalyst was characterized by X-ray diffraction pattern (XRD), inductivity coupled plasma (ICP), Fourier transform infrared (FT-IR) spectroscopy, N2 sorbtion-desorbtion isotherm and by tr...

The design of efficient screens for preventing noise exposure close to road lanes with high traffic flow is both a technical and an economical stake. This design (including material properties) is usually carried out upstream to in-situ realizations through numerical predictions. However, the uncertainties concerning the input data can lead to strong discrepancies in SPL predictions that are no...

In this paper, ultrasonic wave propagation in three phases (3P) of composite materials was investigated. The simulation was conducted by PZFlex analysis code, a time domain finite element program. The reflection and transmission characteristics with different shapes of middle layer between glass fiber and epoxy resin are investigated in order to understand basic ultrasonic behavior of energy di...

A three-dimensional transmission-line matrix (TLM) model was developed to simulate microwave investigation of materials including simulation of microwave scanning. Numerical modeling was carried out for frequencies that are commonly used in microwave nondestructive testing (NDT). Structures with local discontinuities in the electric permittivity are modeled numerically. The excitation parameter...