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RISS 인기검색어
- 검색키워드
- 저자 : Ali Goudarzi (검색결과 9 건)
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Goudarzi, Mohammad Ali,Alimohammadi, Saeed Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.6
Seismic isolation is a well-known method to mitigate the earthquake effects on structures by increasing their fundamental natural periods at the expense of larger displacements in the structural system. In this paper, the seismic response of isolated and fixed base vertical, cylindrical, liquid storage tanks is investigated using a Finite Element Model (FEM), taking into account fluid-structure interaction effects. Three vertical, cylindrical tanks with different ratios of height to radius (H/R = 2.6, 1.0 and 0.3) are numerically analyzed and the results of response-history analysis, including base shear, overturning moment and free surface displacement are reported for isolated and non-isolated tanks. Isolated tanks equipped by lead rubber bearings isolators and the bearing are modeled by using a non-linear spring in FEM model. It is observed that the seismic isolation of liquid storage tanks is quite effective and the response of isolated tanks is significantly influenced by the system parameters such as their fundamental frequencies and the aspect ratio of the tanks. However, the base isolation does not significantly affect the surface wave height and even it can causes adverse effects on the free surface sloshing motion.
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Goudarzi, Mohammad-Ali,Sabbagh-Yazdi, Saeed-Reza Techno-Press 2008 Wind and Structures, An International Journal (WAS Vol.11 No.6
In this paper, computer simulation of wind flow around a single cooling tower with louver support at the base in the KAZERUN power station in south part of IRAN is presented as a case study. ANSYS FLOTRAN, an unstructured finite element incompressible flow solver, is used for numerical investigation of wind induced pressure load on a single cooling tower. Since the effects of the wind ribs on external surface of the cooling tower shell which plays important role in formation of turbulent flow field, an innovative relation is introduced for modeling the effects of wind ribs on computation of wind pressure on cooling tower's shell. The introduced relation which follows the concept of equivalent sand roughness for the wall function is used in conjunction with two equations ${\kappa}-{\varepsilon}$ turbulent model. In this work, the effects of variation in the height/spacing ratio of external wind ribs are numerically investigated. Conclusions are made by comparison between computed pressure loads on external surface of cooling tower and the VGB (German guideline for cooling tower design) suggestions.
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Ali Goudarzi,Atasheh Soleimani‑Gorgani,Ozan Avinc 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Electrically conductive printed textiles are gaining increasing interest and demand worldwide. Cotton fabric's porosity andhigh surface roughness avoid electrically conductive printed patterns on the fabrics. This paper reports the in-situ solutiondeposition of silver free particles inkjet ink via an aqueous single-stage inkjet printing process, which improved electricalconductivity and fastness properties with a new approach. The cotton fabrics were pre-treated with different polyvinylchloride(PVC) solutions prepared in various solvents such as tetrahydrofuran (THF) and dimethylformamide (DMF) that differedin boiling temperature. Afterward, PVC-pre-treated fabrics were printed through the HP Deskjet inkjet printer. The resultsshowed that the PVC-pre-treatment of cotton fabrics significantly improved the electrical conductivity (< 2 Ω/□), antibacterialactivity, thermal management, droplets repellency, adhesion, abrasion, and washing fastness properties, as well as flexibilityproperties. The solvent type in PVC solutions affects the physical properties of the pre-treated cotton fabric. The comparisonin rheological behavior of PVC solutions in DMF and THF at different temperatures displayed the significant difference inviscosity at gel-point for THF and DMF solution. THF solution with higher viscosity cannot diffuse more into porositiesof cotton fabric than the DMF solution, which affects the silver nanoparticles' average crystal size and the final electricalconductivity of the printed fabric. It is the first time using an economical polymer layer on cotton fabrics to provide robustelectronic printed patterns by single-stage inkjet printing. The results confirm that the flexible electronic printed fabric canbe used as a multifunctional electronic textile.
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Mohammad Ali Goudarzi,Saeed Alimohammadi 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.6
Seismic isolation is a well-known method to mitigate the earthquake effects on structures by increasing their fundamental natural periods at the expense of larger displacements in the structural system. In this paper, the seismic response of isolated and fixed base vertical, cylindrical, liquid storage tanks is investigated using a Finite Element Model (FEM), taking into account fluid-structure interaction effects. Three vertical, cylindrical tanks with different ratios of height to radius (H/R = 2.6, 1.0 and 0.3) are numerically analyzed and the results of response-history analysis, including base shear, overturning moment and free surface displacement are reported for isolated and non-isolated tanks. Isolated tanks equipped by lead rubber bearings isolators and the bearing are modeled by using a non-linear spring in FEM model. It is observed that the seismic isolation of liquid storage tanks is quite effective and the response of isolated tanks is significantly influenced by the system parameters such as their fundamental frequencies and the aspect ratio of the tanks. However, the base isolation does not significantly affect the surface wave height and even it can causes adverse effects on the free surface sloshing motion.
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Mohammad-Ali Goudarzi,Saeed-Reza Sabbagh-Yazdi 한국풍공학회 2008 Wind and Structures, An International Journal (WAS Vol.11 No.6
In this paper, computer simulation of wind flow around a single cooling tower with louver support at the base in the KAZERUN power station in south part of IRAN is presented as a case study. ANSYS FLOTRAN, an unstructured finite element incompressible flow solver, is used for numerical investigation of wind induced pressure load on a single cooling tower. Since the effects of the wind ribs on external surface of the cooling tower shell which plays important role in formation of turbulent flow field, an innovative relation is introduced for modeling the effects of wind ribs on computation of wind pressure on cooling tower's shell. The introduced relation which follows the concept of equivalent sand roughness for the wall function is used in conjunction with two equations κ-ε turbulent model. In this work, the effects of variation in the height/spacing ratio of external wind ribs are numerically investigated. Conclusions are made by comparison between computed pressure loads on external surface of cooling tower and the VGB (German guideline for cooling tower design) suggestions.
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Ghazaleh Goudarzi,Hatef Ghasemi Hamidabadi,Maryam Nazm Bojnordi,Azim Hedayatpour,Ali Niapour,Maria Zahiri,Forouzan Absalan,Shahram Darabi 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.3
Human dental pulp stem cells (hDPSCs) could be differentiated into neuron like-cells under particular microenvironments. It has been reported that a wide range of factors, presented in cerebrospinal fluid (CSF), playing part in neuronal differentiation during embryonic stages, we herein introduce a novel culture media complex to differentiate hDPSCs into neuron-like cells. The hDPSCs were initially isolated and characterized. The CSF was prepared from the Cisterna magna of 19-day-old Wistar rat embryos, embryonic cerebrospinal fluid (E-CSF). The hDPSCs were treated by 5% E-CSF for 2 days, then neurospheres were cultured in DMEM/F12 supplemented with 10⁻⁶ μm retinoic acid (RA), glial-derived neurotrophic factor and brain-derived neurotrophic factor for 6 days. The cells which were cultured in basic culture medium were considered as control group. Morphology of differentiated cells as well as process elongation were examined by an inverted microscope. In addition, the neural differentiation markers (Nestin and MAP2) were studied employing immunocytochemistry. Neuronal-like processes appeared 8 days after treatment. Neural progenitor marker (Nestin) and a mature neural marker (MAP2) were expressed in treated group. Moreover Nissl bodies were found in the cytoplasm of treated group. Taking these together, we have designed a simple protocol for generating neuron-like cells using CSF from the hDPSCs, applicable for cell therapy in several neurodegenerative disorders including Alzheimer’s disease.
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Mehdi Goudarzi,Nobumichi Kobayashi,Maryam Fazeli,Masoumeh Navidinia,Ali Hashemi 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.3
Objectives: Staphylococcus aureus is a nosocomial pathogen that provides a major challenge in the healthcare environment, especially in burns units where patients are particularly susceptible to infections. In this study, we sought to determine molecular types of S. aureus isolates collected from burns patients, based on staphylococcal protein A and coagulase gene polymorphisms. Methods: Antibiotic susceptibility testing of 89 S. aureus strains isolated from burn wounds of patients was assessed using the Kirby-Bauer disk diffusion method. Strains were characterized by spa typing, coa typing, and resistance and toxin gene profiling. Results: A total of 12 different spa types were identified with the majority being t790 (18%). Panton- Valentine leucocidin encoding genes were identified in spa types t044 (5.6%), t852 (2.2%) and t008 (2.2%). The most commonly detected antibiotic resistance gene was ant (4΄)-Ia (60.7%). Ten different coa types were detected and the majority of the tested isolates belonged to coa III (47.2%). All the high-level mupirocin-resistant and low-level mupirocin resistant strains belonged to coa type III. Conclusion: The present study illustrated that despite the high frequency of coa III and spa t790 types, the genetic background of S. aureus strains in Iranian burns patients was diverse. The findings obtained are valuable in creating awareness of S. aureus infections within burns units.
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Yaghoub Mansourpanah,Ali Kakanejadifard,Fatemeh Goudarzi Dehrizi,Meisam Tabatabaei,Hamid Soltani Afarani 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
The aim of this study was to coat and change the surface properties of the PES membranes to increase themembrane performance. Accordingly, we coated a layer of chitosan on a PES membrane and then modified the cre-ated layer by acrylic acid and microwave irradiation for the first time. The fabricated layer was modified by acrylic acid(AA) as a grafting agent using a household microwave apparatus without any initiator. Different concentrations of AAand irradiation power as well as irradiation times were studied for the purpose. The obtained membranes were charac-terized using SEM, AFM, ATR-FTIR, contact angle, cross flow filtration, and anti-fouling property measurements. SEMimages showed both the formation of a chitosan-coated PES membrane under the procedure and the resultant alter-ations in the surface structure. Based on the results, a moderate concentration of AA could enhance the coated layerproperties and the rejection capability as well as the antifouling properties of the obtained membranes. AFM imagesrepresented the changes in the nanostructure of the coated layers as well as the surface characteristics. Accordingly, themean surface pore sizes of the obtained membranes were reduced down to 35 nm after modification calculated bySPM-DME software. The antifouling properties of the modified membranes using bovine serum albumin (BSA) as aprotein pattern showed that the flux recovery ratio (FRR) of some membranes increased by three times more than thatof the unmodified membrane.
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Landfill Site Selection using GIS and AHP: a Case Study: Behbahan, Iran
Zeinab Ghaed Rahmat,Mehdi Vosoughi Niri,Nadali Alavi,Gholamreza Goudarzi,Ali Akbar Babaei,Zeinab Baboli,Mohsen Hosseinzadeh 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
Finding a suitable site to dispose solid waste is a difficult task for municipality because it is necessary to consider the different factors and criteria in the landfill siting process. In this study, in order to consider all parameters, a combination of Geographic Information System (GIS) and the Analytic Hierarchy Process (AHP) was used for landfill site selection. For the purpose of making decisions in landfill site selection a hierarchy structural was formed and different parameters have been identified, including distance to groundwater, distance to surface water, sensitive ecosystems, land cover, distance to urban and rural areas, land uses, distance to roads, slope, soil type and distance to waste generation places. At first, the rating method was used to evaluate each criterion individually. Then, the relative importance of criteria to each other was determined by an analytic hierarchy process (AHP). Simple Additive Weighting (SAW) method was applied to evaluate the land suitability. The results showed that 38% of the study area have high suitability for land filling. Finally, five sites were a candidate for field investigation with more details.
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