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Performance evaluation of laterite soil embankment stabilized with bottom ash,coir fiber,and lime

Journal of Mountain Science 2024年第7期21卷 2334-2351页

作者： Yunusa Hamdanu SANI amin EISAZADEH School of Civil Engineering and Technology Sirindhorn International Institute of TechnologyThammasat UniversityPathum Thani 12120Thailand

In tropical regions,heavy rainfall induces erosion and shallow landslides on road ***-based stabilization methods,common in these regions,contribute to climate change due to their high carbon *** study explored the potential application of coir fiber-reinforced laterite soil-bottom ash mixtures as embankment materials in the *** objective is to enhance engineered embankment slopes'erosion resistance and stability while offering reuse options for industrial *** study examined various mix designs for unconfined compressive strength(UCS)and permeability,utilizing 30%bottom ash(BA)and 1%coir fiber(CF)with varying sizes ranging from 10 to 40 mm,6%lime,and laterite soil(LS),followed by microstructural *** results demonstrate that the compressive strength increases as the CF length increases to 25 *** contrast,permeability increases continuously with increasing CF ***-treated mixtures exhibit superior short-and long-term strength and reduce permeability owing to the formation of cementitious materials,as confirmed by microstructural analyses.A lab-scale slope box was constructed to evaluate the surface erosion of the stabilized laterite soil *** on the rainfall simulation results,the LS-BA-CF mixtures show better resistance to erosion and deformation compared to untreated LS,especially when lime is added to the top *** study provides insights into a sustainable and cost-effective approach for slope stabilization using BA and CF,offering a promising solution for tropical regions susceptible to surface erosion and landslides.

关键词： Lateritic soil Bottom ash Coir fiber lime Unconfined compressive strength Permeability FESEM/EDS Rainfall simulation tests

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OpenStreetMap data quality enrichment through awareness raising and collective action tools——experiences from a European project

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Geo-Spatial Information Science 2018年第3期21卷 234-246页

作者： amin Mobasheri Alexander Zipf Louise Francis GIScience Research Group Institute of GeographyHeidelberg UniversityHeidelbergGermany Mapping for Change(Co.Ltd.) LondonUnited Kingdom

Nowadays,several research projects show interest in employing volunteered geographic information(VGI)to improve their systems through using up-to-date and detailed *** European project CAP4Access is one of the successful examples of such international-wide research projects that aims to improve the accessibility of people with restricted mobility using crowdsourced *** this project,OpenStreetMap(OSM)is used to extend OpenRouteService,a well-known routing ***,a basic challenge that this project tackled was the incompleteness of OSM data with regards to certain information that is required for wheelchair accessibility(*** information,kerb data,etc.).In this article,we present the results of initial assessment of sidewalk data in OSM at the beginning of the project as well as our approach in awareness raising and using tools for tagging accessibility data into OSM database for enriching the sidewalk data *** experiments have been carried out in different European cities,and discussion on the results of the experiments as well as the lessons learned are *** lessons learned provide recommendations that help in organizing better mapping party events in the *** conclude by reporting on how and to what extent the OSM sidewalk data completeness in these study areas have benefited from the mapping parties by the end of the project.

关键词： Accessibility OpenStreetMap(OSM) data quality data completeness sidewalk wheel map

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Optimal setting and placement of FACTS devices using strength Pareto multi-objective evolutionary algorithm

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Journal of Central South University 2017年第4期24卷 829-839页

作者： amin Safari Hossein Shayeghi Mojtaba Bagheri Department of Electrical Engineering Azarbaijan Shahid Madani University Tabriz Iran Sama Technical and Vocational Training College Islamic Azad University Bonab Branch Bonab Iran Technical Engineering Department University of Mohaghegh Ardabili Ardabil Iran

This work proposes a novel approach for multi-type optimal placement of flexible AC transmission system(FACTS) devices so as to optimize multi-objective voltage stability problem. The current study discusses a way for locating and setting of thyristor controlled series capacitor(TCSC) and static var compensator(SVC) using the multi-objective optimization approach named strength pareto multi-objective evolutionary algorithm(SPMOEA). Maximization of the static voltage stability margin(SVSM) and minimizations of real power losses(RPL) and load voltage deviation(LVD) are taken as the goals or three objective functions, when optimally locating multi-type FACTS devices. The performance and effectiveness of the proposed approach has been validated by the simulation results of the IEEE 30-bus and IEEE 118-bus test systems. The proposed approach is compared with non-dominated sorting particle swarm optimization(NSPSO) algorithm. This comparison confirms the usefulness of the multi-objective proposed technique that makes it promising for determination of combinatorial problems of FACTS devices location and setting in large scale power systems.

关键词： strength Pareto multi-objective evolutionary algorithm static var compensator (SVC) thyristor controlled series capacitor (TCSC) static voltage stability margin optimal location

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Effect of Deep Cryogenic Heat Treatment on the Wear Behavior of Carburized DIN 1.7131 Grade Steel

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 348-353页

作者： Kamran amini AliReza Araghi amin Akhbarizadeh Department of Materials Science Majlesi BranchIslamic Azad University Department of Materials Science and Engineering Shiraz BranchIslamic Azad University

The effects of the deep cryogenic heat treatment on the microstructural changes,wear resistance,and hardness of carburized DIN 1.7131 grade steel were *** show that cryogenic heat treatment reduced the retained austenite and increased the carbide *** addition,after the cryogenic heat treatment,carbide shows a more uniform distribution,as compared to the conventionally treated *** was also clarified that the hardness of the cryogenically treated samples was improved,but the relative improvement decreases with the distance as the surface *** has been shown that the wear resistance improves due to the cryogenic heat treatment,and the predominant wear mechanism is a combination of the adhesive and tribo-chemical wear.

关键词： DIN 1.7131 grade steel Carburized steel Hardness Deep cryogenic heat treatment Tribo-chemical wear

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Effect of inertia nonlinearity on dynamic response of an asymmetric building equipped with tuned mass dampers

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Earthquake Engineering and Engineering Vibration 2020年第2期19卷 499-513页

作者： Hassan Rezazadeh Fereidoun amini Majid amin Afshar School of Civil Engineering Iran University of Science and TechnologyP.O.Box 16765-163TehranIran Department of Technology and Engineering Imam Khomeini International University NorouzianP.O.Box 34149-16818QazvinIran

This study investigates the effect of nonlinear inertia on the dynamic response of an asymmetric building equipped with Tuned Mass Dampers(TMDs).In the field of structural engineering,many researchers have developed models to study the behavior of nonlinear TMDs,but the effect of nonlinear inertia has not received as much attention for asymmetric *** consider nonlinear inertia,the equations of motion are derived in a local rotary coordinates *** displacements and rotations of the modeled building and TMDs are defined by five-degree-of-freedom(5-DOFs).The equations of motion are derived by using the Lagrangian *** in the proposed nonlinear model,the equations of motion are different from a conventional linear *** order to compare the response of the proposed nonlinear model and a conventional linear model,numerical examples are presented and the response of the modeled buildings are derived under harmonic and earthquake *** is shown that if the nonlinear inertia is considered,the response of the modeled structures changes and the conventional linear approach cannot adequately model the dynamic behavior of the asymmetric buildings which are equipped with TMDs.

关键词： Nonlinear inertia tuned mass damper asymmetric buildings harmonic excitation seismic excitation

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Optimal energy management in multi-carrier microgrids:an MILP approach

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 876-886页

作者： Tohid SHEKARI amin GHOLAMI Farrokh aminIFAR Georgia Institute of Technology AtlantaGA 30332USA School of Electrical and Computer Engineering College of EngineeringUniversity of TehranTehran 11365-4563Iran

With the increasing interdependence of various energy carriers,the operation of power systems is found to correlate closely with the limitations on the other energy *** paper presents a mixed-integer linear programming(MILP)model for the microgrid(MG)optimal scheduling considering technical and economic ties between electricity and natural gas(NG)*** the proposed methodology,different energy converters and storages,including combined heat and power(CHP)units,electricity/heat storage units,and distributed energy resources(DERs)are *** proposed model allows the MG operator to minimize the operation cost of the MG while different operational limitations on the energy hub are *** model is developed based on AC power flow constraints so as to respect reactive power and voltage security *** efficiency and robustness of the proposed MILP formulation are successfully verified using a large-scale test MG.

关键词： Combined heat and power(CHP) Energy hub Microgrid Mixed-integer linear programming(MILP)

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A review of fluid displacement mechanisms in surfactant-based chemical enhanced oil recovery processes:Analyses of key influencing factors

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Petroleum Science 2022年第3期19卷 1211-1235页

作者： Ahmed Bashir amin Sharifi Haddad Roozbeh Rafati School of Engineering Kings CollegeUniversity of AberdeenAB243UEUK

Surfactant-based oil recovery processes are employed to lower the interfacial tension in immiscible displacement processes,change the wettability of rock to a more water-wet system and emulsify the oil to displace it in subsurface porous ***,these phenomena can reduce the capillary pressure and enhance spontaneous *** key factors affecting such immiscible displacement process are temperature,salinity and p H of the fluids,surfactant concentration and ***,before any surfactant flooding process is applied,extensive studies of fluid-fluid and rock-fluid interactions are *** use of other chemicals along with surfactants in chemical enhanced oil recovery(c EOR)processes have been widely considered to exploit the synergy of individual chemicals and complement the weakness arises from each of them during immiscible displacement of fluids in porous ***,such combinations of chemicals lead to alkaline-surfactant(AS),surfactantpolymer(SP),alkaline-surfactant-polymer(ASP),and nanoparticle-surfactant(NS)flooding processes,among *** this review study,we categorised the role and displacement mechanisms of surfactants and discussed the key factors to be considered for analysing the fluid displacement in porous media.

关键词： Alkaline surfactant(AS)flooding Alkaline-surfactant-polymer(ASP)flooding Enhanced oil recovery(EOR) Interfacial tension(IFT) Nanoparticle-surfactant(NS)flooding Surfactant adsorption Surfactant-polymer(SP)flooding Wettability alteration

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Blockchain-Based Secured IPFS-Enable Event Storage Technique With Authentication Protocol in VANET

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IEEE/CAA Journal of Automatica Sinica 2021年第12期8卷 1913-1922页

作者： Sanjeev Kumar Dwivedi Ruhul amin Satyanarayana Vollala Department of CSE Dr.Shyama Prasad Mukherjee International Institute of Information Technology Naya RaipurChhattisgarh 492002India

In recent decades,intelligent transportation systems(ITS)have improved drivers’safety and have shared information(such as traffic congestion and accidents)in a very efficient ***,the privacy of vehicles and the security of event information is a major *** problem of secure sharing of event information without compromising the trusted third party(TTP)and data storage is the main issue in *** technologies can resolve this problem.A work has been published on blockchain-based protocol for secure sharing of events and authentication of *** protocol addresses the issue of the safe storing of event ***,authentication of vehicles solely depends on the cloud *** a result,their scheme utilizes the notion of partially decentralized *** paper proposes a novel decentralized architecture for the vehicular ad-hoc network(VANET)without the cloud *** work also presents a protocol for securing event information and vehicle authentication using the blockchain *** this protocol,the registered user accesses the event information securely from the interplanetary file system(IPFS).We incorporate the IPFS,along with blockchain,to store the information in a fully distributed *** proposed protocol is compared with the *** comparison provides desirable security at a reasonable *** evaluation of the proposed smart contract in terms of cost(GAS)is also discussed.

关键词： Authentication blockchain interplanetary file system(IPFS) secure information sharing security

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Sulfamic acid as a reusable and green catalyst for efficient and simple synthesis of 2-substituted-2,3-dihydroquinazolin-4(1H)-ones in water or methanol

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Chinese Chemical Letters 2011年第11期22卷 1317-1320页

作者： amin Rostami Ashkan Tavakoli Department of Chemistry Faculty of Science University of KurdistanSanandaj ***Iran

A series of 2,3-dihydroquinazolin-4（1H）-ones have been synthesized in good to excellent yields through direct cyclocondensation of anthranilamide and aryl aldehydes or ketones in water or methanol under mild *** reaction was efficiently promoted by 10 mol%sulfamic acid（SA,H_2NSO_3H） and the catalyst could be recovered easily after the reactions and reused without evident loss of reactivity.

关键词： Sulfamic acid Catalyst Anthranilamide Aldehyde Ketone 2 3-Dihydroquinazolin-4(1H)-ones

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Model for Generating Scale-Free Artificial Social Networks Using Small-World Networks

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Computers, Materials & Continua 2022年第12期73卷 6367-6391页

作者： Farhan amin Gyu Sang Choi Department of Information and Communication Engineering Yeungnam UniversityGyeongsan38541Korea

The Internet of Things(IoT)has the potential to be applied to social networks due to innovative characteristics and sophisticated solutions that challenge traditional *** network analysis(SNA)is a good example that has recently gained a lot of scientific *** has its roots in social and economic research,as well as the evaluation of network science,such as graph *** in this area have subverted predefined theories,offering revolutionary ones regarding interconnected networks,and they have highlighted the mystery of six degrees of separation with confirmation of the small-world *** motivation of this study is to understand and capture the clustering properties of large networks and social *** present a network growth model in this paper and build a scale-free artificial social network with controllable clustering *** random walk technique is paired with a triangle generating scheme in our proposed *** a result,the clustering controlmechanism and preferential attachment(PA)have been *** research builds on the present random walk *** took numerous measurements for validation,including degree behavior and the measure of clustering decay in terms of node degree,among other ***,we conclude that our suggested random walk model is more efficient and accurate than previous state-of-the-art methods,and hence it could be a viable alternative for societal evolution.

关键词： Social networks small-world networks network generation models graph theory random walk network design social network analysis

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