UTILISATION OF INVERSE TECHNIQUES FOR VIBRATION SOURCE RECONSTRUCTION

Mohammad Hosseini Fouladi,Mohd. Jailani Mohd. Nor,Ahmad Kamal Ariffin 한국소음진동공학회 2008 한국소음진동공학회 국제학술대회논문집 Vol.2008 No.7

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

Hosseini, Seyed Mohammad Hassan,Baravati, Peyman Rezaei The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

To study and locate partial discharge(PD) and analyze the transient state of power transformer, there is a need for a high frequency model of transformer winding and calculation of its parameters. Due to the high frequency nature of partial discharge phenomenon, there is a need for an accurate model for this frequency range. To attain this goal, a Multi-Conductor Transmission Line (MTL) model is used in this paper for modeling this transformer winding. In order that the MTL model can properly simulate the transformer behavior within a frequency range it is required that its parameters be accurately calculated. In this paper, all the basic parameters of this model are calculated by the use of Finite Element Method (FEM) for a 20kV winding of a distribution transformer. The comparison of the results obtained from this model with the obtained shape of the waves by the application of PD pulse to the winding in laboratory environment shows the validity and accuracy of this model.

A Case Study of Green Supplier Selection Method Using an Integrated ISM-Fuzzy MICMAC Analysis and Multi-Criteria Decision Making

Mohammad Hossein Karimi Gavare,Seyed Javad Hosseini,Mohammad Khajezadeh 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.4

Due to an increased today’s consciousness of environmental challenges, having green suppliers has become an essential concern for organizations about their supply chains. These considerations can help them to achieve their environmental goals and a competitive position in the industry. Thus, a robust framework to select the suppliers with environmental features and concerns is needed for today’s organizations. This study presents an integrated approach included interpretive structural modeling, Fuzzy MICMAC analysis, Fuzzy AHP and Vikor method. Initially, related factors to the green supplier selection are identified and the using the ISM and MICMAC analysis to determine the interaction of the categories and their subfactors driving and dependence power. The results depict that subfactors of “company resources and administrative capacity” category are the most important and fundamental affecting supplier selection problem. AHP is used to determine each weight of criteria and then using Vikor method and devotions analysis to select the most appropriate supplier. To evaluate the proposed framework a case example of brake pad factory is selected. Results is shown that supplier “C” got the highest rank in overall dimensions of study but in the second rank regard to the environmental dimensions.

Aeroelastic analysis of cantilever non-symmetric FG sandwich plates under yawed supersonic flow

Mohammad Hosseini,Ali Ghorbanpour Arani,Mohammad Reza Karamizadeh,Hassan Afshari,Shahriar Niknejad 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.29 No.6

In this paper, a numerical solution is presented for supersonic flutter analysis of cantilever non-symmetric functionally graded (FG) sandwich plates. The plate is considered to be composed of two different functionally graded face sheets and an isotropic homogeneous core made of ceramic. Based on the first order shear deformation theory (FSDT) and linear piston theory, the set of governing equations and boundary conditions are derived. Dimensionless form of the governing equations and boundary conditions are derived and solved numerically using generalized differential quadrature method (GDQM) and critical velocity and flutter frequencies are calculated. For various values of the yaw angle, effect of different parameters like aspect ratio, thickness of the plate, power law indices and thickness of the core on the flutter boundaries are investigated. Numerical examples show that wings and tail fins with larger length and shorter width are more stable in supersonic flights. It is concluded for FG sandwich plates made of Al-Al2O3 that increase in volume fraction of ceramic (Al2O3) increases aeroelastic stability of the plate. Presented study confirms that improvement of aeroelastic behavior and weight of wings and tail fins of aircrafts are not consistent items. It is shown that value of the critical yaw angle depends on aspect ratio of the plate and other parameters including thickness and variation of properties have no considerable effect on it. Results of this paper can be used in design and analysis of wing and tail fin of supersonic airplanes.

Magneto-thermo-elastic response of a rotating functionally graded cylinder

Mohammad Hosseini,Ali Dini 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.56 No.1

In this paper, an analytical solution of displacement, strain and stress field for rotating thick-walled cylinder made of functionally graded material subjected to the uniform external magnetic field and thermal field in plane strain state has been studied. Stress, strain and displacement field as a function of radial coordinates considering magneto-thermo-elasticity are derived analytically. According to the Maxwell electro-dynamic equations, Lorentz force in term of displacement is obtained in cylindrical coordinates. Also, symmetric temperature distribution along the thickness of hollow cylinder is obtained by solving Fourier heat transfer equation in cylindrical coordinates. Using equation of equilibrium and thermo-mechanical constitutive equations associated with Lorentz force, a second-order inhomogeneous differential equation in term of displacement is obtained and will be solved analytically. Except Poisson's ratio, other mechanical properties such as elasticity modulus, density, magnetic permeability coefficient, heat conduction coefficient and thermal expansion coefficient are assumed to vary through the thickness according to a power law. In results analysis, non-homogeneity parameter has been chosen arbitrary and inner and outer surface of cylinder are assumed to be rich metal and rich ceramic, respectively. The effect of rotation, thermal, magnetic field and non-homogeneity parameter of functionally graded material which indicates percentages of cylinder's constituents are studied on displacement, Von Mises equivalent stress and Von Mises equivalent strain fields.

Flotation-Spectrophotometric Determination of Ag(I) at the 10^-7 mol L^-1 Level Using Iodide and Ferroin as an Ion-associate

Hosseini, Mohammad Saeid,Hashemi-Moghaddam, Hamid Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.10

A simple and cost effective method for separation and preconcentration of Ag(I) at the $10^{-7}\;mol\;L^{-1}$ level in the environmental and mineral samples is present. The method is based on the flotation of Ag(I)-iodide complex as an ion-associate with ferroin in pH of 4 from a large volume of an aqueous solution (500 mL) using nheptane. The floated layer was then dissolved in dimethylsulfoxide (DMSO) for the subsequent spectrophotometric determination. Beer's law was obeyed over a range of 2.0 ${\times}$ $10^{-7}$-4.0 ${\times}$ $10^{-6}$ mol $L^{-1}$ with the apparent molar absorptivity of 2.67 ${\times}$ $10^5$ L $mol^{-1}\;cm^{-1}$. The detection limit (n = 5) was 4 ${\times}$ $10^{-8}$ mol $L^{-1}$, and RSD (n = 5) obtained for 2.0 ${\times}$ $10^{-6}$ mol $L^{-1}$ of Ag(I) was 2.2%. The interference effects of a number of elements was studied and found that only $Hg^{2+}$ at low concentration, and $Pb^{2+}$, $Cd^{2+}$, $Cu^{2+}$, and $Fe^{3+}$ ions at moderately high concentrations were interfered. To overcome on these interference effects, the solution was treated with EDTA at a buffering pH of 4 and passed through a column containing Amberlite IR-120 ionexchanger resin, just before the flotation process. The proposed method was applied to determine of Ag(I) in a synthetic waste water, a photographic washing sample and a geological sample and the results was compared with those obtained from the flame atomic absorption spectrometry. The results were satisfactorily comparable with together, so that the applicability of the proposed method was confirmed in encountering with the real samples.

Coumarin Variation in Iranian Biennial Melilotus Genetic Resources and its Relationship with Agro-morphophenological Traits

Mohammad Reza Abbasi, Siavash Hosseini, Latifeh Pourakbar 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.2

Most of Melilotus Miller species, a forage legume, contain coumarin, an unfavorable component in their shoot. There is no information concerning coumarin on Iranian Melilotus germplasms. It is crucial for plant breeders to know the concentration of this component in the breeding materials, its relationship with other traits and with genotype geographic origin. In a two-year field study a total of 196 accessions of biennial Melilotus were planted in two replications in March 2014. Thirty-nine agro-morphobiochemical traits were recorded according to standard descriptors. Fluorescencemetery assay was applied to detect free, conjugated, and total coumarin concentrations in plant leaves. The data were subjected to correlation, path, regression, factor, and cluster analyses. Total coumarin concentration varied from 0.09 to 5.27% of leaf dry weight (LDW) with a mean of 1.63 ± 0.08% of LDW among accessions. In M. officinalis, correlation analysis showed no significant correlation between coumarin concentration and cotyledon, hypocotyl, and stem colors. Therefore, no early predicting trait was determined to estimate coumarin concentration in the early growth phases of the germplasms. A positive linear relationship between leaf area and total coumarin concentration was observed by path and regression analyses. Based on factor analysis and extracted bi-plot, the scatter of accessions with low coumarin and high forage yield was determined. Materials were divided into three groups by k-means cluster analysis. There was no clear pattern between coumarin concentration and genotype geographic origin. The findings could be utilized by Melilotus breeders to apply in their breeding programs.

Prognostic significance of adjuvant radiation therapy in adenocarcinoma of the cecum

Hosseini, Sare,Bananzadeh, Ali Mohammad,Mohammadianpanah, Mohammad,Salek, Roham,Taghizadeh-Kermani, Ali The Korean Society for Radiation Oncology 2018 Radiation Oncology Journal Vol.36 No.1

Purpose: Local recurrence is a common failure pattern in adenocarcinoma of the cecum. This study aimed to investigate the potential role of adjuvant radiation therapy on oncologic outcomes of patients with adenocarcinoma of the cecum. Materials and Methods: This retrospective study was carried out at three large tertiary university hospitals. We analyzed the characteristics, prognostic factors, and survival of 162 patients with adenocarcinoma of the cecum that were treated and followed up between 2000 and 2013. All the patients had undergone a right hemicolectomy and received chemotherapy with (n = 48) or without (n = 114) adjuvant radiation therapy. Results: The subjects were 65 females and 97 males with a median age of 56 years (range, 17 to 90 years) at diagnosis. The 5-year local control (LC), disease free survival (DFS), and overall survival (OS) rates were 72.7%, 57.2%, and 62.6% respectively. In a multivariate analysis, age, tumor stage, node stage, and adjuvant radiation therapy were determined to be independent prognostic factors. Age more than 55 years (hazard ratio [HR] = 1.0; 95% confidence interval [CI], 0.06-0.32; p = 0.003), T4 stage (HR = 6.8; 95% CI, 3.07-15.36; p < 0.001), node positive disease (HR = 4.2; 95% CI, 1.94-9.13; p < 0.001), and the absence of adjuvant radiation therapy (HR = 3.0; 95% CI, 1.39-6.46; p = 0.005) had a negative influence on OS. Conclusion: Adjuvant radiation therapy significantly improves DFS and OS in patients with adenocarcinoma of the cecum.

Flotation-Spectrophotometric Determination of Ag(I) at the 10-7 mol L-1 Level Using Iodide and Ferroin as an Ion-associate

Mohammad Saeid Hosseini,Hamid Hashemi-Moghaddam 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.10

A simple and cost effective method for separation and preconcentration of Ag(I) at the 107 mol L1 level in the environmental and mineral samples is present. The method is based on the flotation of Ag(I)-iodide complex as an ion-associate with ferroin in pH of 4 from a large volume of an aqueous solution (500 mL) using n-heptane. The floated layer was then dissolved in dimethylsulfoxide (DMSO) for the subsequent spectrophotometric determination. Beer's law was obeyed over a range of 2.0 × 107-4.0 × 106 mol L1 with the apparent molar absorptivity of 2.67 × 105 L mol1 cm1. The detection limit (n = 5) was 4 × 108 mol L1, and RSD (n = 5) obtained for 2.0 × 106 mol L1 of Ag(I) was 2.2%. The interference effects of a number of elements was studied and found that only Hg2+ at low concentration, and Pb2+, Cd2+, Cu2+, and Fe3+ ions at moderately high concentrations were interfered. To overcome on these interference effects, the solution was treated with EDTA at a buffering pH of 4 and passed through a column containing Amberlite IR-120 ion-exchanger resin, just before the flotation process. The proposed method was applied to determine of Ag(I) in a synthetic waste water, a photographic washing sample and a geological sample and the results was compared with those obtained from the flame atomic absorption spectrometry. The results were satisfactorily comparable with together, so that the applicability of the proposed method was confirmed in encountering with the real samples.

Wave propagation analysis of carbon nanotubes reinforced composite plates

Mohammad Hosseini,Parisa Chahargonbadizade,Mohammadreza Mofidi 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.88 No.4

In this study, analysis of wave propagation characteristics for functionally graded carbon nanotube-reinforced composite (FG-CNTRC) nanoplates is performed using first-order shear deformation theory (FSDT) and nonlocal strain gradient theory. Uniform distribution (UD) and three types of functionally graded distributions of carbon nanotubes (CNTs) are assumed. The effective mechanical properties of the FG-CNTRC nanoplate are assumed to vary continuously in the thickness direction and are approximated based on the rule of mixture. Also, the governing equations of motion are derived via the extended Hamilton’s principle. In numerical examples, the effects of nonlocal parameter, wavenumber, angle of wave propagation, volume fractions, and carbon nanotube distributions on the wave propagation characteristics of the FG-CNTRC nanoplate are studied. As represented in the results, it is clear that the internal length-scale parameter has a remarkable effect on the wave propagation characteristics resulting in significant changes in phase velocity and natural frequency. Furthermore, it is observed that the strain gradient theory yields a higher phase velocity and frequency compared to those obtained by the nonlocal strain gradient theory and classic theory.