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- 저자 : Amin Salehi (검색결과 4 건)
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Amin Mokari-Yamchi,Ayoub Faramarzi,Ammar Salehi-Sahlabadi,Meisam Barati,Delaram Ghodsi,Masoumeh Jabbari,Azita Hekmatdoost 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.2
Food insecurity is a major and multidimensional global problem, particularly in rural and vulnerable areas. In this cross-sectional study, we aimed to identify the relationship between social support and food insecurity in 404 Iranian rural households. We selected the sample by cluster random sampling and collected data using three questionnaires [demographic, Multidimensional Perceived Social Support Scale (MSPSS), and United States Department of Agriculture food security questionnaires] and analyzed data using chi-square tests and logistic regression (using SPSS version 19.0). Of the 404 Iranian households, 168 (41.6%) were classified as food secure. The logistic regression analysis revealed that education and job status of the household heads and household income were significantly associated with food security status. Additionally, perceived social support was protective against food insecurity after adjusting for confounding factors [compared with the first quartile, second quartile odds ratio (OR)=1.76, 95% confidence interval (CI): 0.94∼3.3 and fourth quartile OR=2.21, 95% CI: 1.13∼4.33]. This study indicated that social support contributes to a reduced chance of food insecurity in rural households. These results suggest that policy makers should focus on strengthening social support in vulnerable communities to help protect against hunger and poverty.
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Influence of sintering temperature on microstructural changes of ceramic Raschig ring
Mehdi Salehi,Amin Salem 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
The thermal behavior of Illitic-kaolinitic clay for manufacturing of low porosity ceramic Raschig rings was characterized during the sintering process. The samples were shaped by extrusion method and fired at different temperatures from 1,100 to 1,300℃. The main physical-chemical transformations were studied by evaluating changes in shrinkage, water absorption, porosity, mechanical strength, microstructure and mineralogical compositions. The optimum sintering condition was found to obtain maximum mechanical strength. Chemical resistance of ceramic Raschig rings also was determined according standard method. It was shown that the better chemical resistance could be attributed to the different mineralogical compositions, in particular with presence of mullite phase.
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Fadavi, Milad,Baboukani, Amin Rabiei,Edris, Hossein,Salehi, Mahdi The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.2
In the present study, $TiB_2-Co$ composite coatings were thermally sprayed onto the surface of a 304 stainless steel substrate using an atmospheric plasma spray (APS). The phase analysis of the powders and plasma-sprayed coatings was performed using X-ray diffractometry analysis. The microstructures of the coatings were studied by a scanning electron microscope (SEM). The average particle size and flowability of the feedstocks were also measured. Both $TiB_2-32Co$ and $TiB_2-45Co$ (wt.%) coatings possessed typical dense lamellar structures and high-quality adhesion to the substrate. The oxidation behaviors of the coatings were studied at $900^{\circ}C$ in an atmospheric environment. In addition, the cross-sectional images of the oxidized coatings were analyzed by SEM. A thin and well-adhered layer was formed on the surface of both $TiB_2-Co$ coatings, confirming satisfactory high-temperature oxidation resistance. The kinetic curves corresponding to the isothermal oxidation of the coatings illustrated a short transient stage from rapid to slow oxidation during the early portion of the oxidation experiment.
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Mostafa Nasiri,Morteza Montazeri-Gh,Amin Salehi,Elham Bayati 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.10
Hardware-in-the-loop (HIL) simulation is an effective technique that is used for development and testing of control systems while some of the control loop components are simulated in a proper environment and the other components are real hardware. In a conventional HIL simulation, the hardware is an electronic control unit which electronic control signals are communicated between the hardware and the software. But, HIL simulation of a mechanical component requires additional transfer systems to connect the software and hardware. The HIL simulation can achieve unstable behavior or inaccurate results due to unwanted time-delay dynamic of the transfer system. This paper presents the use of Smith predictor for time-delay compensation of transfer system in the HIL simulation of an electro-hydraulic fuel control unit (FCU) for a turbojet engine. A nonlinear auto regressive with exogenous input (NARX) neural network model is used for modeling and predicting the FCU behavior. The neural model is trained by Levenberg-Marquardt algorithm and the training and validation sets are generated using the amplitude modulated pseudo random binary sequence (APRBS). The consistency of the experimental real-time simulation and off-line simulation shows the applicability of the presented method for mitigating the effect of unwanted dynamic of the transfer system in the HIL simulation
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