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RISS 인기검색어
- 검색키워드
- 저자 : Ali Mozaffari (검색결과 5 건)
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Ali Rahimzadeh,Farhad Ein-Mozaffari,Ali Lohi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
The use of coaxial mixers has significantly improved gas dispersion in non-Newtonian fluids. However, tothe best of our knowledge, no scale-up investigation of an aerated coaxial mixer has been reported in theliterature. This study aims to explore the gas hold-up, energy dissipation rate, power consumption andcavity size in order to provide the guideline for scaling-up of the coaxial mixers. Through the use of computationalfluid dynamics and electrical resistance tomography, the effects of the aeration rate, centralimpeller type, rotating mode, impeller speed, and pumping direction on the gas dispersion efficacy inboth small-scale and large-scale coaxial mixers containing non-Newtonian fluids were investigated. For the coaxial mixer in the co-rotating mode, the same flow regime was achieved when the centralimpeller tip speed and the anchor impeller rotational speed were kept constant in both small-scaleand large-scale systems. It was observed that maintaining the aeration rate per volume of the non-Newtonian fluid constant was beneficial to preserve the performance of the large-scale coaxial mixerthe same as its small-scale counterpart. The use of specific power consumption as a scale up criterioneffectively improved the energy dissipation rate uniformity, which is critical for shear sensitiveapplications.
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Amir Sasan Mozaffari Nejad,Ali Heshmati,Tayebe Ghiasvand 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.4
Objectives: Aflatoxins are a category of poisonous compounds found in most plants, milk and dairy products. The present research was carried out to detect the presence of aflatoxin M1 (AFM1) in samples of milk collected from Hamadan province, Iran. Methods: Twenty five samples of ultra-high temperature (UHT) and 63 samples of pasteurized milk were collected and the amount of AFM1 was measured by an Enzyme-Linked Immunosorbent Assay method. In addition, the estimated daily intake (EDI) and hazard index (HI) of AFM1 was determined by the following equations:(EDI= mean concentration of AFM1 × daily consumption of milk/body weight; HI= EDI/Tolerance Daily Intake). Results: AFM1 was detected in 21 (84%) UHT milk samples and in 55 (87.30%) pasteurized milk samples. Seven (28%) samples of UHT and 21 (33.33%) pasteurized milk samples had higher AFM1 content than the limit allowed in the European Union and Iranian National Standard Limits (0.05 μg/kg). None of the samples exceeded the US Food and Drug Administration limit (0.5 μg/kg) for AFM1. EDI and HI for AM1 through milk were 0.107 ng/kg body weight/day, and 0.535, respectively. Conclusion: A significant percentage of milk produced by different factories in Iran (84% of UHT and 87.3% of pasteurized milk) was contaminated with AFM1. Therefore, more control and monitoring of livestock feeding in dairy companies may help reduce milk contamination with AFM1. As the HI value was lower than 1, it can be assumed that there was no risk of developing liver cancer due to milk consumption.
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Influence of stiffener edge on the buckling load of holed composite plates
Mahnaz Zakeri,Ali Mozaffari,Mohamad A. Katirae 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.29 No.5
In this paper, buckling load of edge stiffened composite plates is assessed. The effect of stiffener edge size, circular hole, and the fiber orientation angle on buckling behavior of composite plates under uni-axial compressive load is investigated. This paper includes two parts as experimental and numerical studies. L-shape composite plates are manufactured in three different layups. Then the buckling loads are experimentally determined. Subsequently, by using the numerical simulation, the size variation effects of stiffener edge and circular cutout on the plate buckling loads are analyzed in five different layups. The results show that cutout size, stiffener edge height and fiber orientation angle have important effects on buckling load. In addition, there is an optimum height for stiffener edge during different conditions.
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Smooth versus Textured Tissue Expanders: Comparison of Outcomes and Complications in 536 Implants
Omar Allam,Jacob Dinis,Mariana N. Almeida,Alexandra Junn,Mohammad Ali Mozaffari,Rema Shah,Lauren Chong,Olamide Olawoyin,Sumarth Mehta,Kitae Eric Park,Tomer Avraham,Michael Alperovich Korean Society of Plastic and Reconstructive Surge 2024 Archives of Plastic Surgery Vol.51 No.1
Background Increasing concerns regarding the safety of textured surface implants have resulted in surgeons transitioning from textured tissue expanders (TEs) to smooth TEs. Given this change has only recently occurred, this study evaluated outcomes between smooth and textured TEs. Methods Women who underwent two-stage breast reconstruction using TEs from 2013 to 2022 were included. TE-specific variables, perioperative information, pain scores, and complications were collected. Chi-squared, t-test, and linear regression analyses were performed. Results A total of 320 patients received a total of 384 textured and 152 smooth TEs. Note that 216 patients received bilateral reconstruction. TEs were removed in 9 cases. No significant differences existed between groups regarding comorbidities. Smooth TEs had a higher proportion of prepectoral placement (p < 0.001). Smooth TEs had less fills (3±1 vs. 4±2, p < 0.001), shorter expansion periods (60±44 vs. 90±77 days, p < 0.001), smaller expander fill volumes (390±168 vs. 478±177 mL, p < 0.001), and shorter time to exchange (80±43 vs. 104±39 days, p < 0.001). Complication rates between textured and smooth TEs were comparable. Smooth TE had a greater proportion of TE replacements (p = 0.030). On regression analysis, pain scores were more closely associated with age (p = 0.018) and TE texture (p = 0.046). Additional procedures at time of TE exchange (p < 0.001) and textured TE (p = 0.017) led to longer operative times. Conclusion As many surgeons have transitioned away from textured implants, our study shows that smooth TEs have similar outcomes to the textured alternatives.
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Firouzeh Farahtaj,Amir Ghaemi,Alireza Gholami,Alireza Tahamtan,Sadegh Shirian,Maryam Fazeli,Amir Sasan Mozaffari Nejad,Ali Gorji,Hamid Mahmoudzadeh-Niknam,Leila Alizadeh 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.1
Objectives: Despite all the efforts and increased knowledge of rabies, the exact mechanisms of infection and mortality from the rabies virus are not well understood. To understand the mechanisms underlying the pathogenicity of rabies virus infection, it is crucial to study the tissue that the rabies virus naturally infects in humans. Methods: Cerebellum brain tissue from 9 human post mortem cases from Iran, who had been infected with rabies virus, were examined histopathologically and immunohistochemically to evaluate the innate immune responses against the rabies virus. Results: Histopathological examination revealed inflammation of the infected cerebellum and immunohistochemical analyses showed an increased immunoreactivity of heat shock protein 70, interleukin-6, interleukin-1, tumor necrosis factor-alpha, caspase-3, caspase-9, toll-like receptor3 and toll-like receptor4 in the infected brain tissue. Conclusion: These results indicated the involvement of innate immunity in rabies infected human brain tissue, which may aggravate the progression of this deadly disease.
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