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Effect of ultrasonic irradiation on rheological properties of asphaltenic crude oils

Petroleum Science 2012年第1期9卷 82-88页

作者： MOUSAVI seyed mohammadreza RAMAZANI Ahmad NAJAFI Iman DAVACHI seyed mohammad Ultrasonic Research Group Chemical and Petroleum Engineering Department Sharif University of TechnologyAzadi Ave. Tehran Iran Chemical and Petroleum Engineering Department Sharif University of TechnologyAzadi Ave. Tehran Iran Ultrasonic Research Group Chemical and Petroleum Engineering Department Sharif University of Technology Azadi Ave. Tehran Iran Chemical and Petroleum Engineering Department Sharif University of Technology Azadi Ave. Tehran Iran

In this work, the rheological changes of several crude oil samples exposed to ultrasonic waves for different time intervals in addition to the effect of temperature on viscosity behavior of heavy crude oils were investigated using a series of steady shear flow and oscillatory tests. The colloidal structural evolutions of flocs in oil samples were illustrated by analysis of the size distribution of flocculated asphaltene particles （confocal microscopy tests）. The rheological investigations indicate that the ultrasonic irradiation dissolved heavy components in crude oil. After ultrasonic treatment, the Kouh-e-Mond crude oil was found to be pseudoplastic. In addition, confocal microscopy confirms that there was an optimum duration for ultrasonic irradiation, at which the viscosity and flocculation rate of asphaltenic crude oils reduced to the minimum values. The optimum was found to be approximately 40 min for the Kouh-e-Mond crude oil. Experimental results illustrate that the ultrasonic irradiation could disaggregate heavy colloid components in crude oil, and breakdown of asphaltene molecules would only occur in a specific time interval of irradiation. Also according to the temperature sweep test, the oil temperature rise caused by ultrasonic irradiation was not the main reason for theological changes of the crude oil and this alteration may be due to physical and chemical phenomena induced by sonication in crude oil.

关键词： Asphaltene ultrasonic technology pseudoplastic property viscoelastic property yield stress,flocculation time

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Energy Management of Networked Smart Railway Stations Considering Regenerative Braking, Energy Storage System, and Photovoltaic Units

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Energy Engineering 2023年第1期120卷 69-86页

作者： Saeed Akbari seyed Saeed Fazel Hamed Hashemi-Dezaki School of Railway Engineering Iran University of Science and TechnologyTehran13114-16846Iran Department of Electrical and Computer Engineering University of KashanKashan***Iran Research and Innovational Center for Electrical Engineering(RICE) Faculty of Electrical EngineeringUniversity ofWest Bohemia(UWB)Pilsen30100Czech Republic

The networking of microgrids has received significant attention in the form of a smart *** this paper,a set of smart railway stations,which is assumed as microgrids,is connected *** has been tried to manage the energy exchanged between the networked microgrids to reduce received energy from the utility ***,the operational costs of stations under various conditions decrease by applying the proposed *** smart railway stations are studied in the presence of photovoltaic(PV)units,energy storage systems(ESSs),and regenerative braking *** regenerative braking is one of the essential ***,the stochastic behaviors of the ESS’s initial state of energy and the uncertainty of PV power generation are taken into account through a scenario-based *** networked microgrid scheme of railway stations(based on coordinated operation and scheduling)and independent operation of railway stations are *** proposed method is applied to realistic case studies,including three stations of Line 3 of Tehran Urban and Suburban Railway Operation Company(TUSROC).The rolling stock is simulated in the MATLAB ***,the coordinated operation of networked microgrids and independent operation of railway stations are optimized in the GAMS environment utilizing mixed-integer linear programming(MILP).

关键词： Energy management system(EMS) smart railway stations coordinated operation photovoltaic generation regenerative braking uncertainty scenario-based model mixed-integer linear programming(MILP)

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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

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Etiology, pathogenesis, and management of acute intraocular lens opacification: a systematic review

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International Journal of Ophthalmology(English edition) 2022年第7期15卷 1190-1197页

作者： Bita Momenaei mohammad Reza Akbari seyed Ali Tabatabaei mohammad Soleimani Mahdi Soleymanzadeh Kaveh Fadakar Ahmed Alshaheeb Mahtab Malekpour Khazari Yasaman Vaseghi Kasra Cheraqpour Eye Research Center Farabi Eye HospitalTehran University of Medical SciencesTehran 33445432Iran School of Medicine Tehran University of Medical SciencesTehran ***Iran

Millions of cataract surgeries with intraocular lens(IOL) implantation are performed worldwide. Although cataract surgery brings many benefits to the patients, the risk of various complications is still a concern. One of the infrequent adverse events but potentially affecting on patients’ visual acuity and contrast sensitivity is losing the transparency of IOL. IOL opacification may lead to IOL removal or exchange, which is unpleasant to both the patient and the surgeon. Several reports of acute IOL clouding are available in the literature describing various etiologies of this phenomenon, however, the exact mechanism remained unclear in some cases. Herein, we aimed to review the causes and outcomes of intraoperative and early postoperative IOL opacification.

关键词： intraocular lens phacoemulsification acute discoloration acute opacification cataract

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Seismic assessment of nature-inspired hexagrid lateral load-resisting system

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 661-672页

作者： Yasaman Memarzadeh Kiani seyed Hossein hosseini Lavassani Afshin Meshkat-Dini Department of Civil Engineering Faculty of EngineeringKharazmi UniversityTehranIran

This paper provides a general perspective of the seismic performance of a nature-inspired,honey-comb grid structural system,known as a hexagrid,under near-field ground *** performance of this skeleton is then compared to that of a bundled-tube,as a conventional and efficient load-resisting system in order to provide a better perception of the seismic behavior of a hexagrid *** 20-story buildings with bundled-tube and hexagrid skeleton were *** behavior of the structures was investigated through 3-D finite element computer models and nonlinear time history analyses by subjecting the models to seven three-component records of scaled near-field ground *** of peak inter story drift and corner beam-column joint rotations were calculated and *** indicated that by replacing the exterior columns of the bundled-tube system with inclined beam-column elements of nature-inspired hexagons,lateral stiffness of the building increased and it would tolerate less deformations before global dynamic instability is *** presence of inclined columns in the hexagrid skeleton helped to concentrate local nonlinearities in ring beams rather than exterior columns.

关键词： high-rise steel structure hexagrid structure performance assessment nonlinear seismic analysis

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Using ELECTRE-TRI and FlowSort methods in a stock portfolio selection context

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Financial Innovation 2022年第1期8卷 331-365页

作者： Mir seyed mohammad Mohsen Emamat Caroline Maria de Miranda Mota mohammad Reza Mehregan mohammad Reza Sadeghi Moghadam Philippe Nemery Department of Industrial Management Faculty of Management and AccountingAllameh Tabataba’i UniversityTehran 14348-63111Iran Universidade Federal de Pernambuco RecifeBrazil University of Tehran TehranIran SAP BeLux BrusselsBelgium

In recent years,multi-criteria sorting problems have become an interesting topic for researchers working on multi-criteria *** and Choice Expressing REality(ELECTRE)-TRI and FlowSort are well-known approaches suggested for such a *** current study aimed to implement ELECTRE-TRI and FlowSort methods in the stock portfolio selection(SPS)as one of the most popular and important decision-making subjects and compare the outcomes of each method to understand how these methods perform in SPS *** this study,the best–worst method was applied to determine the weights of *** approaches for ELECTRE-TRI and 15 approaches for FlowSort were ***,19 different approaches were considered to select stocks from a large pool of *** indicated that the model parameter should be properly defined to minimize inconsistencies and improve the power of the model.

关键词： Multi-criteria decision-making ELECTRE-TRI FlowSort Best-worst method Finance

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Spatiotemporal dynamic of environmental indices of watershed sustainability in connection with land-use change

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Ecosystem Health and Sustainability 2022年第1期8卷 11-25页

作者： Fahimeh Mirchooli seyed Hamidreza Sadeghi Abdulvahed Khaledi Darvishan Department of Watershed Management Engineering Faculty of Natural ResourcesTarbiat Modares UniversityTehranIran

Exploring spatial and temporal land-use changes is valuable for local governments to address issues of sustainability and planning policy where urbanization and industrialization are taking *** anthropogenic effects,natural driving forces like climate change may also affect ***,such relationships have not been studied ***,this study first investigates the land-use changes and their relationship with land surface temperature(LST)for the Shazand Watershed,Iran,in 1986,1998,2008,and 2016 coincided with supplementary industrialization ***,the relations among LST and other biophysical parameters,including Normalized Difference Vegetation Index(NDVI),Normalized Difference Buildup Index(NDBI),and Normalized Difference Water Index(NDWI),were analyzed,and corresponding variations were *** results indicated that the mean LST of the study watershed has an increasing trend from 1986 to 2008 due to land-use change and drought ***,LST decreased in *** LST was associated with irrigation farming and orchard,and higher LST was related to sparse oak forest *** was also a negative correlation between LST and *** a result,it was inferred that greenery declined ***,a positive correlation was found between LST and NDBI resulting from the built-up *** LST could influence biological,physical,chemical processes,it can therefore be supported as an effective index for environmental sustainability assessment.

关键词： Temperature–emissivity separation algorithm land surface temperature Shazand Watershed sustainability index sustainability trend Watershed monitoring

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Unraveling a Driven Damped Harmonic Oscillator through Entangled State Representation

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Chinese Physics Letters 2013年第11期30卷 22-24页

作者： seyed Mahmoud Ashrafi mohammad Reza Bazrafkan Department of Physics Faculty of ScienceI.K.I.UniversityQazvinIran

Employing the thermo-entangled state representation,the common eigenstates of relative position and the total momentum of a two-mode system,we solve the master equation of a damped harmonic oscillator driven by a time... 详细信息

关键词： field momentum harmonic

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Diesel generator exhaust heat recovery fully-coupled with intake air heating for off-grid mining operations:An experimental,numerical,and analytical evaluation

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International Journal of Mining Science and Technology 2022年第1期32卷 155-169页

作者： Durjoy Baidya Marco Antonio Rodrigues de Brito Agus PSasmito seyed Ali Ghoreishi-Madiseh Norman B.Keevil Institute of Mining Engineering The University of British ColumbiaVancouver V6T 1Z4Canada Department of Mining and Materials Engineering McGill UniversityMontreal H3A 2A7Canada

The customarily discarded exhaust from the fossil fuel-based power plants of the off-grid mines holds the thermal potential to fulfill the heating requirement of the underground *** present research fills in an important research gap by investigating the coupling effect between a diesel exhaust heat recovery and an intake air heating system employed in a remote *** integrative approach comprising analytical,numerical,and experimental assessment has been *** novel analytical model developed here establishes the reliability of the proposed mine heating system by providing comparative analysis between a coupled and a decoupled *** effect of working fluid variation has been examined by the numerical analysis and the possible improvement has been *** investigations present a demonstration of the successful lab-scale implementation of the concept and validate the numerical and analytical models *** deployment of the fully coupled mine heating system proposed here will assist the mining industry on its journey towards energy-efficient,and sustainable mining practices through nearly 70%reduction in fossil fuel consumption for heating intentions.

关键词： Remote mines Waste heat utilization Diesel exhaust Combined heat and power generation Clean energy in mining Coupled heating system

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Nonadiabatic Tapered Optical Fiber for Biosensor Applications

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Photonic Sensors 2012年第4期2卷 340-356页

作者： Hamid LATIFI mohammad I. ZIBAII seyed M. hosseini Pedro JORGE Laser & Plasma Research Institute Shahid Beheshti University Evin Tehran Iran Department of Microbiology Faculty of Biological Sciences Shahid Beheshti University Evin Tehran Iran INESC Porto Rua do Campo Alegre 687 4169-007 Porto Portugal

biconical 上的简短评论逐渐变细为 biosensing 应用的纤维传感器被介绍。这个传感器的许多配置和格式为免费 biosensing 基于测量小折射索引改变的标签被设计了。biconical nonadiabatic 逐渐变细光纤维为光察觉到提供很多个有利性质... 详细信息

biconical 上的简短评论逐渐变细为 biosensing 应用的纤维传感器被介绍。这个传感器的许多配置和格式为免费 biosensing 基于测量小折射索引改变的标签被设计了。biconical nonadiabatic 逐渐变细光纤维为光察觉到提供很多个有利性质，它在几 biosensing 应用被利用了，包括房间，蛋白质，和 DNA 传感器。这些传感器的类型介绍展示一根缩小的察觉到探针，没有标签的直接察觉，和高敏感的一个便宜纤维生物传感器。

关键词：传感器应用生物传感锥形光纤绝热光纤传感器传感探头直接检测无标记

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