Since many applications rely on the knowledge of the electromagnetic Material properties of ferrites, such as ferrite phase shifters, this paper presents an algorithm for characterizing ferrite Materials in a single frequency using a rectangular waveguide system. In this method, the extraction of ferrite parameters is implemented through minimizing the difference between the measured data and the results from modal analysis of the system. The main advantage of this method compared to the other ones is that the proposed method only needs the amplitude of the reflection and transmission coefficients to estimate the parameters of ferrite Materials. This makes the implementation easy and eliminates the problems associated with phase calibrations and measurements. This validation is achieved by simulation and experimental tests. The proposed algorithm is validated by characterizing YIG and SL-470 ferrites.

In this study, nanoscale MCM-41 molecular sieve was prepared under a basic condition by a hydrothermal method using cetyltrimethylammonium bromide as a template and tetraethyl orthosilicate as a silica source. Methylated nanoscale MCM-41 molecular sieve was prepared from the nanoscale MCM-41 by post-synthesis method using trimethylchlorosilane (TMCS) as coupling agent. The product was characterized by means of element analysis, powder X-ray diffraction, Fourier transform infrared (FT-IR) spectroscopy, low-temperature nitrogen adsorption-desorption technique at 77 K, scanning electron microscopic (SEM), thermogravimetry-differential thermal analysis (TG-DTA). Powder XRD showed that the framework of the molecular sieve was well retained and the degree of ordering of the methylated MCM-41 decreases. IR spectra and the low-temperature nitrogen adsorption-desorption technique suggested that methyl was successfully grafted to the inner surface of the methylated MCM-41 and the mesoporous channels of the methylated MCM-41 were still maintained. Scanning electron microscopic results showed that the average size of the methylated MCM-41 prepared was 112 nm. Differential thermal analysis showed that the prepared Material has preferable thermal stability and the methylated MCM-41 can be stable at 903oC.

The aim of this work is to present a technique to identify elastic parameters of composite Materials. The identification is based on the adjustment of coefficients in an optimization process in which the objective function is defined by the difference between the analytical natural frequencies and the measured ones. Such analytical natural frequencies are obtained by the finite element method (FEM) while the experimental ones are determined by ordinary modal tests. The proposed approach uses Genetic Algorithm (GA) to solve the optimization problem. A few examples are presented to identify the indirect (Non-Destructive) prediction of mechanical properties of homogeneous isotropic, orthotropic, and anisotropic plates for showing the ability, capability, reliability, modeling and performance of this technique.    

Background & Objectives: Dermal exposure to chemical agents can result in a variety of occupational diseases and disorders, including occupational skin diseases and systemic toxicity. The present paper focused on transport properties of nanocomposite based on carboxylated nitrile butadiene rubber (XNBR)-nanoclay.Methods: In this study, XNBR gloves nanocomposite were prepared at different amounts of nanoclay; i.e. 3, 6, 9 phr (parts per hundred of rubber). Swelling procedure was conducted for different nanocomposites using two neat organic solvents (i.e. Carbon tetrachloride (CCl4) and Ethyl acetate).Results: Near Fickian diffusion was observed for XNBR based nanocomposites containing different amounts of nanoclay. The permeability coefficients were higher for ethyl acetate compared to CCl4 in all XNBR nanocomposites. In addition, a significant decrease was observed in the permeability coefficients of the selected solvent XNBR3.Conclusion: Analysis of transport properties of synthesized nanocomposites illustrated that application of these Materials seems promising for manufacturing protective gloves.

Background: The globe currently faces two major issues: a deficit of new resources and an excessive amount of trash creation. To solve these issues, the extra waste might be used as a supply in the manufacturing process. The industrial sector is focusing on this kind of waste reclamation.Aim: To prepare natural fish bone based bioactive Material, natural fish bones are considered potential options for artificial bone due to their high bioactivity and biocompatibility.Methods: To synthesize a composite Material, natural fish bones were used from sources of raw Materials. The X-ray diffraction, Fourier-transform infrared spectroscopy, and electron dispersive X-ray analysis were used to assess the synthetic Material.Results: The results showed that phosphate and calcium were presented in the synthesized powder. The average particle size of the calcined fish bone was 300 -500 nm.Conclusion: Because of their possible biological and mechanical properties, Materials made from waste natural resource Materials might be appropriate for use as fillers for different dental implants.

Nickel oxide/cobalt phthalocyanine (NiO– CoPc) nanocomposite is synthesized by solvent evaporation method. The synthesized nanocomposite is characterized for thermal, structural, and optical properties. Thermogravimetric and differential thermal analysis results proved the thermal stability of the sample. XRD patterns revealed an average crystallite size of 16 and 17. 5 nm, respectively, for the pure and nanocomposite samples. The formation of NiO/CoPc nanocomposite is confirmed by the FTIR results. The characteristic B and Q bands of metal phthalocyanines are visible in the absorption spectrum. A decrease in band gap and an enhanced absorption in the visible region are observed for the nanocomposite. The PL emission spectrum of the nanocomposite exhibits fluorescence quenching which makes them suitable for solar cells and photocatalysis. This work constitutes the first report on the synthesis and characterization of the NiO/CoPc nanocomposite.