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Green Energy & Environment 2018年第2期3卷 129-137页

作者： mohammad hatami Jiafeng Geng Dengwei Jing Mechanical Engineering Department Esfarayen University of Technology (EUT) International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University

In this study, effects of different nanoparticles and porosity of absorber tube on the performance of a Concentrating Parabolic Solar Collector(CPSC) were investigated. A section of porous-filled absorber tube was modeled as a semi-circular cavity under the solar radiation which is filled by nanofluids and the governing equations were solved by FlexPDE numerical software. The effect of four physical parameters, nanoparticles type, nanoparticles volume fraction(φ), Darcy number(Da) and Rayleigh number(Ra), on the Nusselt number(Nu) was discussed. It turns out that Cu nanoparticle is the most suitable one for such solar collectors, compared to the commonly used Fe_3O_4, Al_2O_3, TiO_*** the increased addition of Cu nanoparticles all the parameters φ, Da and Ra shows a significant increase against the Nu, indicates the enhanced heat transfer in such cases. As a result, low concentration of Cu nanoparticle suspension combined with porous matrix was supposed to be beneficial for the performance enhancement of concentrating parabolic solar collector.

关键词： Concentrating parabolic solar collector Porous absorber tube Nanofluid Nusselt number Finite Element Method

Experimental investigation of performance improving and emissions reducing in a two stroke SI engine by using ethanol additives

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Propulsion and Power Research 2013年第4期2卷 276-283页

作者： Mohsen Ghazikhani mohammad hatami Behrouz Safari Davood Domiri Ganji Ferdowsi University of Mashhad Engineering FacultyMechanical Engineering DepartmentIran Esfarayen University Engineering and Technical CollegeMechanical Engineering DepartmentEsfarayenNorth KhorasanIran Babol University of Technology Mechanical Engineering DepartmentMazandaranBabolIran

In present study,the operational parameters for a two stroke gasoline engine such as delivery ratio,scavenging efficiency,trapping efficiency,*** been investigated experimentally when its fuel is blended with ethanol *** the amounts of emitted pollutants(HC,CO,CO_(2)and NO_(X))from this engine are measured in various engine velocity and *** experiments,ethanol is combined with gasoline in different percentages of 5%,10%and 15%.The experiments have been done for 2500,3000,3500 and 4500 *** results show that in most test cases,when alcoholic fuel is used,scavenging efficiency and delivery ratio increased due to rapid evaporation of ethanol,but fuel converging efficiency and brake specific fuel consumption(BSFC)*** most outstanding result of using ethanol additive is significant reduction in pollutions emitted from engine and CO with 35%reduction has the most reduction percentage among other pollutants.

关键词： Two strokeengine Ethanol additives Delivery ratio Scavenging efficiency Emissions

MHD and Viscous Dissipation Effects in Marangoni Mixed Flow of a Nanofluid over an Inclined Plate in the Presence of Ohmic Heating

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Fluid Dynamics & Materials Processing 2021年第2期17卷 285-300页

作者： D.R.V.S.R.K.Sastry Peri K.Kameswaran mohammad hatami Department of Mathematics SASTRA UniversityTamilnaduIndia Department of Mathematics School of Advanced SciencesVIT UniversityTamilnaduIndia Mechanical Engineering Department Esfarayen University of TechnologyEsfarayenIran

The problem of Marangoni mixed convection in the presence of an inclined magnetic field with uniform strength in a nanofluid(formed by the dispersion of two metallic nanoparticles,i.e.,Copper(Cu),and alumina(Al_(2)O_(3))in water)is addressed *** effects of viscous dissipation and Ohmic heating are also *** original set of governing partial differential equations is reduced to a set of non-linear coupled ordinary differential equations employing the similarity transformation *** simplified equations are numerically solved through MATLAB‘bvp4c’*** results are presented in terms of graphs for several *** is found that enhancing the stratification parameter leads to a decrease in the fluid temperature,and an increase in the aligned magnetic field angle reduces the flow ***,mixed convection tends to enhance both the Nusselt and Sherwood *** the angle of inclination is made higher,the fluid velocity is reduced and the thickness of the thermal and concentration boundary layer grows.

关键词： Viscous dissipation inclined magnetic field marangoni mixed convection nanofluid

Iranian Medical Staff’s Perception of the <i>All Saints</i>TV S

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Open Journal of Psychiatry 2015年第3期5卷 267-277页

作者： Arsia Taghva Masoud Azizi mohammad Reza hatami Vahid Donyavi Department of Psychiatry AJA University of Medical Sciences Tehran Iran Department of English Language Amirkabir University Tehran Iran

The present study was an attempt to explore the Iranian medical staff’s perception of the All Saints TV series. 199 participants including doctors, nurses, interns, and paramedics took part in this survey study which was done in 2011. A 17-item Likert scale questionnaire was developed by the team of researchers to gather further evidence on the issues raised by the participants in the focus group which was formed in order to delve into their thoughts, attitudes, and feelings about the mentioned program. The supportive and non-blaming nature of the working relationship among the treatment team, their respect for the patients, their strong team work, the accuracy and precision of the presented medical information, and the discipline and sense of responsibility on the part of the medical staff were among the most frequent issues being mentioned and noticed by the participants. In addition, the majority of the participants considered the demonstrated model for providing healthcare services to be an efficient one;however, they believed that it was not possible to apply that model in the Iranian hospitals mainly due to the cultural differences between the two contexts and the current regulations in Iran. The participants were also observed to be only moderately satisfied with the system they were working in. It seems that healthcare systems in the developed countries can be used as models to identify the problems with the existing healthcare system in Iran. Authorities need to take appropriate measures to resolve such problems. The possible solutions and actions have been suggested in the present article.

关键词： All Saints TV Series Iranian Medical Staff Perceptions

Effects of different gases on the performance of foams stabilized by Cocamidopropyl betaine surfactant and silica nanoparticles:A comparative experimental study

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Petroleum 2022年第4期8卷 546-551页

作者： Masoud hatami Alooghareh Atefeh Kabipour Mohamadhosein ghazavi Seyyed mohammad Mousavi Sisakht Mehdi Razavifar Department of Chemical Engineering Faculty of EngineeringShahid Chamran University of AhvazAhvazIran Islamic Azad University Khark BranchKhark IslandBoushehrIran Lamerd Higher Education Center Petroleum Engineering DepartmentLamerdFarsIran Department of Petroleum Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

Application of CO_(2)gas in foam enhanced oil recovery(EOR)processes has emerged as a win-win strategy for achieving higher oil recovery factor and reducing greenhouse gas emission,which can significantly help the protection of the ozone layer from ***,lower stability of CO_(2)-foam,as compared to the N_(2)-and CH_(4)^(-)foams,has tempted us to examine combinations of CO_(2)with these gases to not only improve the stability of the produced foam but also have CO_(2)as the gaseous phase of the *** this study,we investigated the effect of different gases and the mixture thereof on the performance of foams in EOR while the aqueous phase of foams is a constant mixture of Cocamidopropyl betaine surfactant(0.03 wt%)and silica nanoparticle(0.1 wt%).To this end,seven different gases,including N_(2),CO_(2),CH4,80%N_(2)^(+)20%CO_(2),80%CH_(4)^(+)20%CO_(2),50%CH_(4)^(+)50%CO_(2),50%N_(2)^(+)50%CO_(2)were used as the gases phase for foam generation and the performance of the produced foams were examined through the following experiments:bulk foam stability tests,apparent foam viscosity measurements and core flooding *** results of foam stability tests showed that half-life time for the CO_(2)-,CH_(4)^(-)and N_(2)-foams are 13.5,17.0 and 44.0 min,***,as revealed from apparent viscosity measurements,the N_(2)-and 80%N_(2)^(+)20%CO_(2)foams have higher apparent foam viscosity values followed by 50%N_(2)^(+)50%CO_(2)***,we showed that a combination of 80%N_(2)^(+)20%CO_(2)as the gaseous phase for foam generation could not only improve CO_(2)-foam stability,as compared to other foams,but also can substantially increase ultimate oil recovery(56.6%OOIP),even more than that for N_(2) foam(48.6%OOIP),obtained from core flooding experiments.

关键词： Foam Carbon dioxide Nitrogen Methane Silica nanoparticles Surfactant Mobility ratio

ORGANOSOLUBLE,THERMALLY STABLE POLYAMIDES CONTAINING SULFONE AND SULFIDE UNITS

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Chinese Journal of Polymer Science 2009年第6期27卷 781-787页

作者： Shahram Mehdipour-Ataei Mehdi hatami mohammad Hossein Mosslemin Iran Polymer and Petrochemical Institute Department of Chemistry Isfahan University of Technology Department of Chemistry Islamic Azad University

A new diamine containing sulfone,sulfide and amide groups was synthesized via a three-step reaction process. The nucleophilic substitution reaction of 4-aminothiophenol with 4-nitrobenzoyl chloride in the presence of propylene oxide (PO) afforded N-(4-mercaptophenyl)-4-nitrobenzamide(MPNB).The catalytic reduction of the nitro group in MPNB to amino group was accomplished by using Pd/C and hydrazine monohydrate to produce 4-amino-N-(4-mercapto phenyl)benzamide(AMPB).Reaction of two moles of AMPB with bis(4-c...

关键词： Polymerizations Polycondensation Nucleophilic substitution Polyamides Thermal properties

A basal area increment model for individual trees in mixed continuous cover forests in Iranian Caspian forests

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Journal of Forestry Research 2020年第1期31卷 99-106页

作者： Nishtman hatami Peter Lohmander mohammad Hadi Moayeri Soleiman mohammadi Limaei Department of Forestry Faculty of Natural ResourcesGorgan University of Agricultural Sciences and Natural ResourcesP.O.Box 386mGorganIran Optimal Solutions in Cooperation with Linnaeus University Va¨xjo¨Sweden Department of Forestry Faculty of Natural ResourcesUniversity of GuilanP.O.Box 1144Sowmeh SaraIran

The aim of this study was to develop and test a new basal area growth model in mixed species continuous cover forests in northern *** 421 core samples from 6 main species in the forest area to develop our growth *** each plot,we measured variables such as total tree height(m),diameter at breast height(DBH)(cm)and basal area of larger trees as cumulative basal areas of trees(GCUM)ofDBH[5 *** empirical data were analyzed using regression *** was a statistically significant nonlinear function between the annual basal area increment,as the dependent variable,and the basal area of the individual trees and competition as explanatory *** area from the largest trees,was circular plot with area of 0.1 *** was estimated for trees of DBH>5 ***,we investigated the dependencies of diameter growth of different species on stand density at different levels of competition,and diameter development of individual trees through *** results indicate that competition caused by larger neighborhood trees has a negative effect on *** addition,the maximum diameter increment is affected by competition ***,the maximum diameter increment of species occurs when the trees are about 35–40 cm in dense-forest(40 to 0 m^2 per ha)and when the trees are about 60 to 70 cm in very dense forest(60 to 0 m^2 per ha)which is more likely to Caspian natural forests with high level density due to uneven-aged composition of stands.

关键词： Individual-tree model Iranian Caspian forests Continuous cover forestry Mixed stands Uneven-aged management

Hydrocarbon production rates in Fischer-Tropsch synthesis over a Fe/Cu/La/Si catalyst

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Journal of Energy Chemistry 2013年第1期22卷 119-129页

作者： Ali Nakhaei Pour Farshad Riyahi mohammad Reza Housaindokht mohammad Irani Seyed Mehdi Kamali Shahri Behnam hatami Department of Chemistry Ferdowsi University of Mashhad Department of Chemical Engineering Petroleum University of Technology (PUT) Research Institute of Petroleum Industry of National Iranian Oil Company Chemical Engineering Department Penn State University University Park

The detailed kinetics of Fischer-Tropsch synthesis over an industrial Fe/Cu/La/Si catalyst was studied in a continuous spinning basket re- actor under the conditions relevant to industrial operations. Reaction rate equations were derived on the basis of Langmuir-Hinshelwood- Hougen-Watson type models for Fischer-Tropsch synthesis based on possible reactions sets originated from the carbide, enolic and combined enol/carbide mechanisms. Kinetic model candidates were evaluated by the global optimization of kinetic parameters, which were realized by first minimization of multi-response objective functions with conventional Levenberg-Marquardt method. It was found that an enolic mech- anism based model could produce a good fit of the experimental data. The activation energy for paraffin formation is 95 ***1-1 which is smaller than that for olefin formation （121 ***-1）.

关键词： Fischer-Tropsch synthesis kinetics iron catalysts catalysts selectivity

Fischer-Tropsch synthesis over ruthenium-promoted Co/Al_2O_3 catalyst with different reduction procedures

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Journal of Natural Gas Chemistry 2010年第5期19卷 503-508页

作者： Ali Karimi Ali Nakhaei Pour Farshad Torabi Behnam hatami Ahmad Tavasoli mohammad Reza Alaei mohammad Irani Research Institute of Petroleum Industry (RIPI) Gas Research Division

The effect of reduction procedure on catalyst properties, activity and products selectivity of ruthenium-promoted Co/γ-Al2O3 catalyst in Fischer-Tropsch synthesis （FTS） was investigated. Catalyst samples were reduced with different reduction gas compositions and passivated before being characterized by TPR and XRD techniques. Different activity and product selectivity analyses were also performed. These results showed that the catalyst dispersion, particle size, and the degree of reduction changed with different reduction gas compositions, which were resulted from the water partial pressures in reduction process that give varying degrees of interaction with the support. It has been suggested that the FTS activity of cobalt catalyst was directly dependent on the catalyst reducibility. A reduction gas with a molar ratio of H2Prle = 1 was used to prevent the formation of Co-support compound during catalyst reduction.

关键词： Fischer-Tropsch synthesis cobalt reducibility activity C5+ selectivity

Numerical Solution of Model of Cancer Invasion with Tissue

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Applied Mathematics 2013年第7期4卷 1050-1058页

作者： Farhad hatami mohammad Bagher Ghaemi Department of Mathematics Iran University of Science and Technology Tehran Iran

Chemotaxis-haptotaxis model of cancer invasion with tissue remodeling is one of the important PDE’s systems in medicine, mathematics and biomathematics. In this paper we find the solution of chemotaxis-haptotaxis model of cancer invasion using the new homotopy perturbation method (NHPM). Then by comparing some estimated numerical result with simulation laboratory result, it shows that NHPM is an efficient and exact way for solving cancer PDE’s system.

关键词： Chemotaxis Haptotaxis Model of Cancer Invasion New Homotopy Perturbation Method