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BIOCELL 2014年第1期38卷 11-16页

作者： mohammad reza ramezani Hossein NADERI-MANESH Hossain-Ali RAFIEEPOUR Department of Biophysics Faculty of Biological SciencesTarbiat Modares UniversityTehranIran Department of Biotechnology Faculty of ChemistryUniversity of KashanKashanIran

Cell-based biosensors have become a research hotspot in the biosensors and bioelectronics fields. The main feature of cell-based biosensors is immobilization of living cells on the surface of transducers. Different types of polymers which are used as scaffolds for cell growth should be biocompatible and should have reac- tive functional groups for further attachment of biomolecules. In this work, cell attachment and proliferation on chitosan hydrogel, chitosan-gelatin and gold nanoparticle-chitosan nanocomposite membranes was stud- ied. Characterization of the membranes was performed using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Cytotoxicity assessment on HEK293 cells was carried out for all mem- branes using the MTT assay. Cell morphology and viability were assessed to evaluate cell attachment and pro- liferation. Regarding cell studies, the findings revealed that none of the membranes induced cytotoxic effects. However, the data showed that gold nanoparticle nanocomposite membranes improved HEK293 attachment and adhesion more than other membranes, indicating that it provides an effective surface for immobilizing cells for sensing applications.

关键词： gold nanoparticle-chitosan nanocomposite HEK293 cells cytotoxic effects scanning electron microscopy

Effect of fiber hybridization on energy absorption and synergy in concrete

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Frontiers of Structural and Civil Engineering 2019年第6期13卷 1338-1349页

作者： Ahmadreza ramezani mohammad reza ESFAHANI Department of Civil Engineering Ferdowsi University of MashhadMashhad 91775-1111Iran

In the present study,steel and polypropylene(PP)fibers have been utilized with the intent of obtaining hybrid fiber-reinforced concrete(HFRC)with desirable mechanical *** attempt has been made to scrutinize the properties of HFRC with the main concentration being on energy absorption characteristics of concrete and the efficacy of fiber hybridization in producing ***,a total of 180 specimens,representing 20 different mixtures have been cast and evaluated through compressive,split tensile,and flexural *** relevant flexural toughness of the specimens was calculated using ASTM C1018,ASTM Cl 609,JSCE,and PCS methods,and the effectiveness of these methods was evaluated based on the experimental *** was observed that steel fibers are more effective in the improvement of flexural toughness in the presence ofPP ***,synergy associated with the combination of fibers at different stages of deflection of the beam specimens was observed and analyzed.

关键词： hybrid fiber-reinforced concrete synergy toughness steel fibers polypropylene fibers

Strengthening of reinforced concrete beams using fiberreinforced cementitious matrix systems fabricated with custom-designed mortar and fabrics

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1100-1116页

作者： Ahmadreza ramezani mohammad reza ESFAHANI Javad SABZI Faculty of Engineering Ferdowsi University of MashhadMashhadIran

The performance of a new fiber-reinforced cementitious matrix(FRCM)system developed using custom-designed mortar and fabrics is investigated in this *** behavior of this system is evaluated in terms of both the flexural and shear strengthening of reinforced concrete *** beams are designed to assess the effectiveness of the FRCM system in terms of flexural strengthening,and four specimens are designed to investigate their shear *** parameters investigated for flexural strengthening are the number of layers,span/depth ratio,and the strengthening *** previous studies,custom fabrics with similar axial stiffness are used in all strengthening methods in this *** the shear-strengthened specimens,the effects of the span/depth ratio and strengthening system type(fiberreinforced polymer(FRP)or FRCM)are *** proposed FRCM system exhibits desirable flexural and shear strengthening for enhancing the load capacity,provides sufficient bonding with the substrate,and prevents premature failure *** the similar axial stiffness of fabrics used in both FRCM and FRP systems and the higher load capacity of specimens strengthened by the former,cement-based mortar performs better than epoxy.

关键词： fiber-reinforced cementitious matrix flexural strengthening shear strengthening carbon fiber-reinforced polymer shear span

Phytosomal curcumin alleviates collagen-induced arthritis by downregulating Th17 and upregulating Treg cell responses in rats

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Asian Pacific Journal of Tropical Biomedicine 2022年第11期12卷 466-474页

作者： Mahnaz ramezani Nahid Zainodini reza Nosratabadi Yaser Yousefpoor Zahra Taghipour Mitra Abbasifard mohammad reza Rahmani Immunology of Infectious Diseases Research Center Research Institute of Basic Medical SciencesRafsanjan University of Medical SciencesRafsanjanIran Department of Medical Immunology Afzalipour Faculty of MedicineKerman University of Medical SciencesKermanIran Gastroenterology and Hepathology Research Center Institute of Basic and Clinical Physiology SciencesKerman University of Medical SciencesKermanIran Department of Medical Biotechnology School of Paramedical SciencesTorbat Heydariyeh University of Medical SciencesTorbat HeydariyehIran Khalil Abad Health Center Mashhad University of Medical SciencesMashhadIran Department of Anatomy School of MedicineRafsanjan University of Medical SciencesRafsanjanIran Department of Internal Medicine Ali-Ibn Abi-Talib HospitalSchool of MedicineRafsanjan University of Medical SciencesRafsanjanIran Physiology-Pharmacology Research Center Research Institute of Basic Medical SciencesRafsanjan University of Medical SciencesRafsanjanIran Department of Physiology and Pharmacology School of MedicineRafsanjan University of Medical SciencesRafsanjanIran

Objective:To explore the effects of a nano-formulation of curcumin(phytosomal curcumin)on the clinical and pathological symptoms of collagen-induced arthritis(CIA)in ***:Forty male Wistar rats were immunized with an emulsion containing bovine typeⅡcollagen and incomplete Freund's adjuvant and then administered phytosomal curcumin *** symptoms and histological analysis of the synovial tissues were *** effect of phytosomal curcumin on Th17 and Treg parameters was also ***:Phytosomal curcumin reduced the clinical severity and paw swelling in CIA-induced rats,which was accompanied by a reduction in the number of inflammatory cell infiltration in the synovial ***,treatment with phytosomal curcumin significantly inhibited CIA-associated mediators as well as increased the anti-inflammatory mediators in comparison to the control ***:Phytosomal curcumin could improve CIA autoimmune responses and can be considered a potential candidate for the treatment of rheumatoid arthritis.

关键词： Phytosomal curcumin Rheumatoid arthritis Collagen Th17 Treg Anti-inflammation Curcuma longa

Enhancement of magnesium aluminate-based nickel and cobalt nanostructured catalysts with iron for improved performance in carbon dioxide methanation

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Progress in Natural Science:Materials International 2024年第5期34卷 921-932页

作者： mohammad Hosein rezazadeh Yalda ramezani Fereshteh Meshkani Catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of Kashan Department of Chemical and Biomolecular Engineering Ohio University Department of Chemical and Petroleum Engineering University of Calgary

This study investigates the performance of Ni and Co catalysts based on Fe-promoted MgAl2O4for CO2methanation, which is a crucial step in mitigating environmental carbon dioxide levels. The MgAl2O4support was modified with various Fe loading（5, 10, and 15 wt%） and fabricated via a novel coprecipitation technique with the help of ultrasonic waves and chosen as support for 15 wt% Ni and Co active phases. Examination of the BET surface properties of the catalysts showed an increase in surface area in the range of 54–82 m2/g and 73–85 m2/g with an increasing Fe loading for Ni and Co catalysts, respectively. Among the Ni-based catalysts, the 15Ni/10FeMgAl2O4specimen exhibited the best performance（with a 73.31 % CO2conversion and 95.61 % selectivity rate） and remarkable lifetime during 10 h at 400°C due to the better reducibility and the increase in hydrogen consumption. However, a rise in Fe amount to 15 wt% led to a reduction in the CO2conversion to 34.43 %. The catalytic outcomes also demonstrated that the presence of Fe in Co/MgAl2O4catalysts negatively affects catalytic performance. The unpromoted Co/MgAl2O4sample demonstrated the best performance, achieving a conversion rate of 52.41 % at 350°C.

关键词： CO2-Methanation Fe promoter MgAl2O4 base Nanoparticles Ni-based promoted catalysts

Calculating the transient behavior of grounding systems using inverse Laplace transform

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第3期12卷 250-262页

作者： Nabiollah ramezani Seyed mohammad SHAHRTASH Behshahr Branch Iran University of Science and TechnologyBehshahr 47137Iran Center of Excellence for Power Systems Automation and Operation Department of Electrical EngineeringIran University of Science and TechnologyTehran 16844Iran

This paper deals with a unified and novel approach for analyzing the frequency and time domain performance of grounding *** proposed procedure is based on solving the full set of Maxwell's equations in the frequency domain,and enables the exact computation of very near fields at the surface of the grounding grid,as well as far fields,by simple and accurate closed-form expressions for solving Sommerfeld *** addition,the soil ionization is easily considered in the proposed *** frequency domain responses are converted to the time domain by fast inverse Laplace *** results are validated and have shown acceptable accuracy.

关键词： Electromagnetic field Near-field computation High frequency performance Soil ionization Grounding system Fast inverse Laplace transform

Stabilizing silica nanoparticles in high saline water by using polyvinylpyrrolidone for reduction of asphaltene precipitation damage under dynamic condition

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1021-1029页

作者： mohammad reza Aghajanzadeh mohammad Sharifi Department of Petroleum Engineering Amirkabir University of Technology

In this study, the performance of stable nanofluid containing SiO2 nanoparticles dispersed and stabilized in high salinity brine for asphaltene inhibition in dynamic condition is evaluated. In the first stage of this work, the stability of silica nanoparticles in different range of water salinity(0–100000 mg·L-1) is investigated. Next, stable nanofluid containing highest salinity is selected as asphaltene inhibitor agent to inject into the damaged core sample. The estimated values of oil recovery for base case, after damage process and after inhibition of asphaltene precipitation using nanofluid are 51.6%, 36.1% and 46.7%, respectively. The results showed the reduction in core damage after using nanofluid. In addition, the relative permeability curves are plotted for the base case, after damage process and also after inhibition of asphaltene precipitation using nanofluid. Comparison of relative permeability curves shows, relative permeability of oil phase decreased after damage process as compared with the base case. But after using nanofluid the oil relative permeability curve has shifted to the right and effective permeability of oil phase has been improved.

关键词： Formation damage Enhanced oil recovery Salinity Asphaltene Core flooding Nano particles

Predicting COVID-19 fatality rate based on age group using LSTM

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Asian Pacific Journal of Tropical Medicine 2021年第12期14卷 564-574页

作者： Zahra ramezani Seyed Abbas Mousavi Ghasem Oveis mohammad reza Parsai Fatemeh Abdollahi Jamshid Yazdani Charati Department of Epidemiology and Biostatistics School of HealthMazandaran University of Medical SciencesSariIran Department of Psychiatry Psychiatry and Behavioral Sciences Research CenterAddiction InstituteMazandaranUniversity of Medical SciencesSariIran Health vice-chancellor of Mazandaran University of Medical Sciences SariIran Control Disease Center Mazandaran University of Medical SciencesSariIran Department of Public Health Psychiatry and Behavioral Sciences Research CenterMazandaran University of Medical SciencesSariIran

Objective: To predict the daily incidence and fatality rates based on long short-term memory(LSTM) in 4 age groups of COVID-19 patients in Mazandaran Province, ***: To predict the daily incidence and fatality rates by age groups, this epidemiological study was conducted based on the LSTM model. All data of COVID-19 disease were collected daily for training the LSTM model from February 22, 2020 to April 10, 2021 in the Mazandaran University of Medical Sciences. We defined 4 age groups, i.e., patients under 29, between 30 and 49, between 50 and 59, and over 60 years old. Then, LSTM models were applied to predict the trend of daily incidence and fatality rates from 14 to 40 days in different age groups. The results of different methods were compared with each ***: This study evaluated 5 0826 patients and 5 109 deaths with COVID-19 daily in 20 cities of Mazandaran Province. Among the patients, 25 240 were females(49.7%), and 25 586 were males(50.3%). The predicted daily incidence rates on April 11, 2021 were 91.76, 155.84, 150.03, and 325.99 per 100 000 people, respectively;for the fourteenth day April 24, 2021, the predicted daily incidence rates were 35.91, 92.90, 83.74, and 225.68 in each group per 100 000 people. Furthermore, the predicted average daily incidence rates in 40 days for the 4 age groups were 34.25, 95.68, 76.43, and 210.80 per 100 000 people, and the daily fatality rates were 8.38, 4.18, 3.40, 22.53 per 100 000 people according to the established LSTM model. The findings demonstrated the daily incidence and fatality rates of 417.16 and 38.49 per 100 000 people for all age groups over the next 40 days. Conclusions: The results highlighted the proper performance of the LSTM model for predicting the daily incidence and fatality rates. It can clarify the path of spread or decline of the COVID-19 outbreak and the priority of vaccination in age groups.

关键词： COVID-19 Long short-term memory model Incidence rate Fatality rate Prediction Age classification

Experimental investigation of different brines imbibition influences on co-and counter-current oil flows in carbonate reservoirs

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Chinese Journal of Chemical Engineering 2021年第5期34卷 17-29页

作者： Pouyan Ahmadi mohammad reza Aghajanzadeh Masoud Riazi mohammad reza Malayeri mohammad Sharifi Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Helmholtz Centre for Environmental Research-UFZ LeipzigGermany Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Institut für Verfahrenstechnik und Umwelttechnik Technische Universität DresdenGermany

Imbibition of water,as wetting phase in oil-wet fractured carbonate reservoirs,plays a key role in fluid flow between matrix and fracture *** type of injected seawater and its chemistry would profoundly influence the imbibition *** this study,the impact of smart water(a brine that its ions have been adjusted to facilitate oil recovery)and low salinity water on co-and counter-current imbibition processes for oil-wet carbonate cores has been experimentally *** results show an increase of about 10% in oil recovery for co-and counter-currents for smart seawater imbibition compared to that of low salinity *** addition,as a result of the influence of co-and counter-current on each other,by co-current removal from one core face,the countercurrent in the other face would be intensified by as much as about 75%.A close examination of different lengths(5,7 and 9 cm)of carbonate cores with the same permeability revealed that by decreasing porous medium length,the amount of counter-current producing oil would be decreased so that in the 5 cm core,counter current oil production will not *** similar core lengths by increasing permeability,the share of counter current flow would be decreased approximately 18% since the capillary pressure could not overcome non-wetting phase viscous *** the role of matrix length along with a modified brine(which is designed according to the matrix mixture)strengthen the relevant mechanisms to have more oil production so that the higher thickness of matrix causes the higher amount of co-current oil producing and consequently more total recovery.

关键词： Smart water Co-current Counter current Wettability alteration Oil recovery

Stochastic price based coordinated operation planning of energy storage system and conventional power plant

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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1020-1032页

作者： mohammad reza SHEIBANI Gholam reza YOUSEFI mohammad Amin LATIFY Department of Electrical and Computer Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran

A generation company(GENCO)which has a conventional power plant(CPP)intends to add an energy storage system(ESS)beside the CPP to increase its flexibility and *** this purpose,a new model is proposed for coordinated operation planning of the CPP and ESS in energy and spinning reserve markets in the presence of a bilateral *** proposed model is based on the stochastic price based unit commitment(PBUC)and price based storage commitment(PBSC).The uncertainties of the energy and spinning reserve prices and delivery requests in the spinning reserve market are modeled via scenarios based upon historical *** proposed model maximizes the profitability of the ESS beside the CPP and encourages the GENCO to invest the *** technology options to use beside the CPP are determined by economic *** results show that utilization of ESSs improves the technical operation of CPPs,as well as GENCOs’profitability.

关键词： Energy storage system Conventional power plant Operation planning Price based unit commitment