检索结果-南通市图书馆

6G-Enabled Internet of Things:Vision,Techniques,and Open Issues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第12期133卷 509-556页

作者： Mehdi Hosseinzadeh Atefeh Hemmati amir masoud Rahmani Pattern Recognition and Machine Learning Lab Gachon UniversitySeongnam13120Korea Department of Computer Engineering Science and Research BranchIslamic Azad UniversityTehran***Iran Future Technology Research Center National Yunlin University of Science and TechnologyYunlin64002Taiwan

There are changes in the development of wireless technology systems every decade.6G(sixth generation)wireless networks improve on previous generations by increasing dependability,accelerating networks,increasing available bandwidth,decreasing latency,and increasing data transmission speed to standardize communication *** purpose of this article is to comprehend the current directions in 6G studies and their relationship to the Internet of Things(IoT).Also,this paper discusses the impacts of 6G on IoT,critical requirements and trends for 6G-enabled IoT,new service classes of 6G and IoT technologies,and current 6G-enabled IoT studies selected by the systematic literature review(SLR)method published from 2018 to *** addition,we present a technical taxonomy for the classification of 6G-enabled IoT,which includes self-organization systems,energy efficiency,channel assessment,and ***,according to the articles reviewed,we consider the evaluation factors in this domain,including data transmission,delay,energy consumption,and ***,we focus on open issues and future research challenges in 6G-enabled *** mention important future challenges and directions,we can point to migration,data storage,data resource,data security,data sharing,data offloading,availability,scalability,portability,user experience,reliability,authentication,and authorization.

关键词： Internet of Things 6G wireless network machine learning artificial intelligence

Application of ion-engineered Persian Gulf seawater in EOR:effects of different ions on interfacial tension,contact angle,zeta potential,and oil recovery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2021年第3期18卷 895-908页

作者： amir Hossein Saeedi Dehaghani Seyed masoud Ghalamizade Elyaderani Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

In this study,we initially performed interfacial tension(IFT)tests to investigate the potential of using the Persian Gulf seawater(PGSW)as smart water with diferent concentrations of NaCl,KCl,MgCl_(2),CaCl_(2),and Na_(2)SO_(4).Next,for each salt,at the concentration where IFT was minimum,we conducted contact angle,zeta potential,and micromodel fooding *** results showed that IFT is minimized if NaCl or KCl is removed from PGSW;thus,for solutions lacking NaCl and KCl,the IFT values were obtained at 26.29 and 26.56 mN/m,***,in the case of divalent ions,minimum IFT occurred when the concentration of MgCl_(2),CaCl_(2),and Na_(2)SO_(4) in PGSW ***,a threefold rise in the concentration of Na_(2)SO_(4) further reduced IFT as compared to optimal concentrations of MgCl_(2) or CaCl_(2).It should be mentioned that eliminating NaCl from PGSW resulted in the lowest IFT value compared to adding or removing other *** the removal of NaCl caused the contact angle to decrease from 91.0°to 67.8°relative to PGSW and changed surface wettability to weakly water-wet,eliminating KCl did not considerably change the contact angle,such that it only led to a nine-degree reduction in this angle relative to PGSW and left wettability in the same neutral-wet *** optimal concentrations of MgCl_(2),CaCl_(2),and Na_(2)SO_(4),only an increase in Na_(2)SO_(4) concentration in PGSW could change wettability from neutral-wet to weakly *** solutions with optimal concentrations,the removal of NaCl or KCl caused the rock surface to have slightly higher negative charges,and increasing the concentration of divalent ions led to a small reduction in the negative charge of the *** results of micromodel fooding indicated that NaCl-free PGSW could raise oil recovery by 10.12%relative to ***,when the Na_(2)SO_(4) concentration in PGSW was tripled,the oil recovery increased by 7.34%compared to ***,depending on th

关键词： Smart water Minimum IFT Wettability Zeta potential Enhanced oil recovery

Exploring the mechanical properties of steel-and polypropylene-reinforced ultra-high-performance concrete through numerical analyses and experimental multi-target digital image correlation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2023年第8期17卷 1228-1248页

作者： Behrooz DADMAND Hamed SADAGHIAN Sahand KHALILZADEHTABRIZI masoud POURBABA amir MIRMIRAN Department of Civil Engineering University of RaziKermanshah ***Iran Department of Civil Engineering University of TabrizTabriz ***Iran Ingram School of Engineering Texas State UniversitySan MarcosTX 78666USA University of Texas at Tyler TylerTX 75799USA

This study presents experimental and numerical investigations on the mechanical properties of ultrahigh-performance concrete(UHPC)reinforced with single and hybrid micro-and macro-steel and polypropylene *** this purpose,a series of cubic,cylindrical,dog-bone,and prismatic beam specimens(total fiber by volume=1%,and 2%)were tested under compressive,tensile,and flexural loadings.A method,namely multi-target digital image correlation(MT-DIC)was used to monitor the displacement and deflection *** obtained experimental data were subsequently used to discuss influential parameters,i.e.,flexural strength,tensile strength,size effect,*** analyses were also carried out using finite element software to account for the sensitivity of different ***,nonlinear regression analyses were conducted to obtain the flexural load-deflection *** results showed that the MT-DIC method was capable of estimating the tensile and flexural responses as well as the location of the crack with high *** addition,the regression analyses showed excellent consistency with the experimental results,with correlation coefficients close to ***,size-effect modeling revealed that modified Bazant theory yielded the best estimation of the size-effect phenomenon compared to other models.

关键词： UHPC MT-DIC flexural behavior tensile behavior steel fiber polypropylene fiber

Experimental investigation of the impact of sugarcane molasses on the properties of colloidal gas aphron(CGA)drilling fluid

在线全文

学校读者我要写书评

暂无评论

Petroleum 2023年第2期9卷 199-204页

作者： amir Hossein Saeedi Dehaghani Seyed masoud Ghalamizade Elyaderani Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

Colloidal gas aphron(CGA)based fluid has become very popular in drilling in the last two decades,as it reduces formation damages *** this study,sugarcane molasses(Mls)was used for the first time as a polymer in CGA-based to investigate its ability to improve the role of aphronized fluid as a drilling *** results showed that increasing the concentration of Mls to 12%(v/v)in CGA-based fluid reduces the drainage rate and increases half-life to 10.6 min,resulting in enhanced stability of the aphronized ***,because of increasing Mls concentration from 1%to 12%(v/v),the yield and the initial gas hold-up decrease to 74%and 299.4 mL,respectively,indicating that the presence of Mls allows less air into the aphron *** the rheological properties were improved in this study,the gel strength did not change ***,the results showed that by increasing the concentration of Mls,the average size of the bubbles decreases,and the particle-size distribution becomes more ***,the API filtration test revealed that the higher the Mls concentration in the aphronized fluid,the lower the fluid loss,and at the Mls concentration of 12%(v/v),the fluid loss was estimated at 19.54 mL.A natural polysaccharide with high molecular weight,Mls can be used as a polymer in CGAbased fluid and,thus,improve its performance.

关键词： Colloidal gas aphron Sugarcane molasses Drainage rate Rheology Filtration loss

Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel:Electrochemical parameters and adsorption mechanism

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 271-282页

作者： masoud Sabzi amir Hayati Jozani Farzad Zeidvandi Majid Sadeghi Saeid Mersagh Dezfuli Young Researchers and Elite Club Dezful BranchIslamic Azad UniversityDezfulIran Department of Materials Science and Engineering Science and Research BranchIslamic Azad UniversityTehranIran Center of Excellence for Surface Engineering and Corrosion Protection of Industrial School of Metallurgy and Materials EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran

We investigated the effect of the 2-mercaptobenzothiazole concentration on the sour-corrosion behavior of API X60 pipeline steel in an environment containing H_(2)S at 25°C and in the presence of 0,2.5,5.0,7.5,and 10.0 g/L of 2-mercaptobenzothiazole *** examine this behavior,we conducted open-circuit potential(OCP),potentiodynamic polarization,and electrochemical impedance spectroscopy(EIS)*** dispersive spectroscopy and scanning electron microscopy were also used to analyze the corrosion *** results of the OCP and potentiodynamic polarization tests revealed that 2-mercaptobenzothiazole reduces the speed of both the anodic and cathodic *** assessment of the Gibbs free energy of the inhibitor(△G_(ads)^(■))indicated that its value was less than-20 kJ·mol^(-1)and greater than-40 k J·mol^(-1).Therefore,the adsorption of 2-mercaptobenzothiazole onto the surface of the API X60 pipeline steel occurs both physically and chemically,the latter of which is particularly *** addition,as the△G_(ads)^(■)dsvalue was negative,we could conclude that the adsorption of 2-mercaptobenzothiazole onto the surface of the pipeline steel occurs *** EIS results indicate that with the increase in the 2-mercaptobenzothiazole inhibitor concentration,the corrosion resistance of API X60 steel *** analysis of the corrosion products revealed that iron sulfide compounds form on the *** summary,the results showed that an increase in the inhibitor concentration results in a decrease in the corrosion rate and an increase in inhibitory ***,we found that the 2-mercaptobenzothiazole adsorption process on the API X60 steel surfaces in an H2 S-containing environment follows the Langmuir adsorption isotherm and occurs spontaneously.

关键词： API X60 steel sour corrosion 2-mercaptobenzothiazole inhibitor concentration electrochemical parameters environments containing hydrogen sulfide

Benzene removal by nano magnetic particles under continuous condition from aqueous solutions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2014年第3期8卷 345-356页

作者： Mohammad Mehdi Amin Bijan Bina amir masoud Samani Majd Hamidreza Pourzamani Environment Research Center lsfahan University of Medical Sciences Isfahan *** Iran BAEN Department Texas A&M University TX 77843 USA

Benzene removal evaluated using Fe304 nano continuous condition. A 44 initial benzene concentration, from aqueous solutions was magnetic particles （NM） in factorial design including NM dose, contact time and pH was investigated in 16 experiments （Taguchi OA design）. The results indicated that all factors were significant and the optimum condition was： pH 8, NM dose of 2000 mg.L-1, benzene concentrations of 100 mg.L-1 and contact time of 14min. The maximum benzene uptake and distribution ratio in the optimum situation were 49.4mg.g-1 and 38.4L.g-1, respectively. The nano particles were shown to capture 98.7% of the benzene in optimum batch condition and 94.5% in continuous condition. The isotherm data proved that the Bmnauer-Emmett-Teller model fit more closely and produced an isotherm constant （b） less than one, indicating favorable adsorption. Regeneration studies verified that the benzene adsorbed by the NM could be easily desorbed by temperature, and thereby, NM can be employed repeatedly in water and wastewater management.

关键词： benzene experimental design Fe304 continues condition thermal recycling

Synthesis of WC powder through microwave heating of WO_3–C mixture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 202-207页

作者： amir Karimzadeh Behnami Arman Hoseinpur masoud Sakaki Mohammad Sh. Bafghi Kazumichi Yanagisawa School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) Narmak Tehran 16846-13114 Iran Department of Materials Engineering Faculty of Engineering Malayer University Malayer 65719-95863 Iran Research Laboratory of Hydrothermal Chemistry Faculty of Science Kochi University Kochi 780-8073 Japan

A simple, easy, and low-cost process for the fabrication of tungsten carbide （WC） powder through microwave heating of WO3-C mixtures was developed. Thermodynamic calculations and experimental investigations were carried out for WO3-and W-C systems, and a formation mechanism was proposed. In the results, for the synthesis of WC, the use of over stoichiometric amount of C together with a spe- cially assembled experimental setup （which effectively retains heat in the system） is necessary. The WC powder is successfully obtained by heating WO3：5C mixture for 900 s in a domestic microwave oven.

关键词： tungsten carbide microwave heating carbothermic reduction thermodynamic analysis

AFAR:adaptive fuzzy ant-based routing for communication networks

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第12期9卷 1666-1675页

作者： Seyed Javad MIRABEDINI Mohammad TESHNEHLAB M.H.SHENASA Ali MOVAGHAR amir masoud RAHMANI Engineering Department Science and Research BranchIslamic Azad UniversityTehranIran Control Department K.N.Toosi Technology UniversityTehranIran Computer Department Sharif UniversitTehranIran

We propose a novel approach called adaptive fuzzy ant-based routing (AFAR), where a group of intelligent agents (or ants) builds paths between a pair of nodes, exploring the network concurrently and exchanging obtained information to up-date the routing tables. Routing decisions can be made by the fuzzy logic technique based on local information about the current network state and the knowledge constructed by a previous set of behaviors of other agents. The fuzzy logic technique allows multiple constraints such as path delay and path utilization to be considered in a simple and intuitive way. Simulation tests show that AFAR outperforms OSPF, AntNet and ASR, three of the currently most important state-of-the-art algorithms, in terms of end-to-end delay, packet delivery, and packet drop ratio. AFAR is a promising alternative for routing of data in next generation networks.

关键词： Adaptive fuzzy routing algorithm Swarm intelligence Routing table Communication network Packet delay,Throughput

Evaluation of some engineering properties of cucumber(Cucumis sativus L.)seeds and kernels based on image processing

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2017年第4期4卷 300-315页

作者： amir Hossein Mirzabe masoud Barati kakolaki Behnam Abouali Rasoul Sadin Department of Mechanical Engineering of Biosystems Aboureihan CollegeTehran UniversityTehranIran Department of Biosystems Bajgah CollegeShiraz UniversityShirazIran

In this study,a method based on digital image processing was employed to investigate effect of the moisture content on gravimetrical and frictional properties of the cucumber seeds and *** research indicated that the application of visual machines and the image processing could be a rapid method that enables accurate measurement of the dimensional parameters of two varieties of this product *** length,width,and thickness of the seeds of Rashid variety ranged from 6.40 to 9.07,2.91 to 4.21 and 0.65 to1.50 mm,respectively;the corresponding value of Negin variety ranged from 6.89 to 9.07,2.49 to 4.21,and 0.69 to 1.68 mm,*** and shell ratios of the Rashid variety were found to be 69.811 and 30.189%,respectively;the corresponding values of the Negin variety were found to be 72.727 and 27.273%,*** the bulk densities of the two varieties of cucumber seeds and kernels that decreased with the moisture content,true density and porosity of the two varieties of cucumber seeds and kernels *** the moisture content increased from 5.04 to 21.12%(d.b),the angle of the static friction of the seeds of Negin variety increased from 30.39°to 37.18°,28.83° to 34.991,24.37°to 30.04°,and 15.77°to 19.57°for wood,rubber,iron,and galvanized,respectively,the corresponding value of the Negin variety increased from 21.12to 27.16°,24.43°to 31.41°,19.90°to 25.59°and 14.09°to 18.12°as the moisture content increased from 5.02 to 21.02%(d.b).

关键词： Image processing Physical and mechanical properties Cucumber