Examinando por Autor "Lashgari, Amir"

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    Fractal dimension calculation of a manganese-chromium bimetallic nanocomposite using image processing
    (Hindawi Publishing Corporation, 2015) Lashgari, Amir; Ghamami, Shahriar; Shahbazkhany, Saeedeh; Salgado-Morán, Guillermo; Glossman-Mitnik, Daniel
    Bimetallic materials, which have the ability to convert heat change into mechanical movement, normally consist of two bonded strips of dissimilar metals that expand at different rates. We describe how we made a manganese-chromium (Mn-Cr) bimetallic nanocomposite using the centrifuge method and a low-to-high approach. We conducted scanning electron microscope (SEM) imaging, energy-dispersive X-ray spectroscopy (EDX) analysis, and X-ray diffraction spectra of the nanocomposite to prove its identity. We examined how centrifuge speed, process time, and the use of an "intruder agent" affected the properties of the material. The fractal dimension is a significant factor that can be used to approximate the surface roughness, the texture segmentation, and an image of the studied compounds. We calculated the technique of fractal dimensions using image-processing values on a computer and histogram plot with the SEM image of the Mn-Cr bimetallic nanocomposite using MATLAB sofware. We applied the Statistical Package for the Social Sciences sofware for statistics data extracted from the SEM image of the nanocomposite and obtained the following results: mean = 1.778, median = 1.770, max = 1.98, min = 1.60, skewness = 0.177, range = 0.38, and harmonic mean = 1.771 for fractal dimension of the SEM image. © 2015 Amir Lashgari et al.
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    Morphological Investigation and Fractal Properties of Realgar Nanoparticles
    (Hindawi Publishing Corporation, 2015) Lashgari, Amir; Ghamami, Shahriar; Bahrami, Zahra; Shomossi, Farzaneh; Salgado-Morán, Guillermo; Glossman-Mitnik, Daniel
    Some arsenic compounds can show extraordinary polymorphism. Realgar (As4S4) is among several minerals with various crystal forms and is one of the most important sources of arsenic for pharmaceutical use. Currently, realgar is used as an arsenic source in many industries, such as weaponry, publishing, textiles, cosmetics, and health products. In this paper, we used and reported new methods for the purification, nanonization, and structural morphological investigations of As4S4 by using planetary ball mills process for nanonization of the compound. The product was characterized using X-ray powder diffraction analysis, Fourier transform infrared spectrometry spectra, and field emission scanning electron microscope (FESEM) imaging. We investigated the morphological properties of FESEM-imaged realgar nanoparticles by an image-processing technique that calculates fractal dimensions using values on a computer with MATLAB software. We applied the Statistical Package for the Social Sciences software for statistics data extracted from the FESEM image and obtained the statistics results of the fractal dimension and histogram plot for the FESEM image. Copyright © 2015 Amir Lashgari et al.