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Acta Mechanica Solida Sinica 2022年第2期35卷 344-356页

作者： M.K.ramezani S.Ramesh J.Purbolaksono R.Das Centre of Advanced Manufacturing and Materials Processing Department of Mechanical EngineeringFaculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Department of Mechanical Engineering University of PertaminaJakarta 12220Indonesia Sir Lawrence Wackett Aerospace Research Centre School of EngineeringRMIT UniversityMelbourneVI 3000Australia

In this work,the stress intensity factors(SIFs)for a wide range of semi-elliptical surface cracks with different inclination angles in a cylindrical bar subjected to pure tension were investigated *** main parameters considered to evaluate the SIFs were the crack size ratio(a/d),the crack aspect ratio(a/c),and the crack inclination angle(0).The dual-boundary element met hod implemented in software BEASY was used to compute the SIF values for *** her more,the general closed-form solutions were proposed to evaluate the corresponding SIFs for Mode I,Mode II and Mode III types of fracture through curve fitting *** solutions can provide accurate and reliable values of stress intensity factors for a crack on a cylindrical bar under pure tension in a rapid way compared to those obtained using computational *** addition,these results can be used as inputs for failure studies and life evaluations of cracked cylinder under working conditions.

关键词： Stress intensity factor Surface crack Solid cylinder Closed-form solution Dual-boundary element method

Proportional Fairness Based Energy Efficient Routing in Wireless Sensor Network

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Computer Systems Science & Engineering 2022年第6期41卷 1071-1082页

作者： abolfazl Mehbodniya Surbhi Bhatia Arwa Mashat Mohanraj Elangovan Sudhakar Sengan Department of Electronics and Communications Engineering Kuwait College of Science and TechnologyKuwait Department of Information Systems College of Computer Sciences and Information TechnologyKing Faisal UniversitySaudi Arabia Department of Information Systems College of Computing and Information TechnologyKing Abdulaziz UniversityRabighSaudi Arabia Department of Computer Science and Engineering K.S.Rangasamy College of TechnologyTiruchengode637215Tamil NaduIndia Department of Computer Science and Engineering PSN College of Engineering and TechnologyTirunelveli627152Tamil NaduIndia

Wireless Sensor Network (WSN) is an independent device that comprises a discrete collection of Sensor Nodes (SN) to sense environmental positions,device monitoring, and collection of information. Due to limited energy resourcesavailable at SN, the primary issue is to present an energy-efficient framework andconserve the energy while constructing a route path along with each sensor ***, many energy-efficient techniques focused drastically on energy harvesting and reduced energy consumption but failed to support energy-efficient routingwith minimal energy consumption in WSN. This paper presents an energy-efficientrouting system called Energy-aware Proportional Fairness Multi-user Routing(EPFMR) framework in WSN. EPFMR is deployed in the WSN environment usingthe instance time. The request time sent for the route discovery is the foremost stepdesigned in the EPFMR framework to reduce the energy consumption rate. Theproportional fairness routing in WSN selects the best route path for the packet flowbased on the relationship between the periods of requests between different *** path discovered for packet flow also measure energy on multi-user route pathusing the Greedy Instance Fair Method (GIFM). The GIFM in EPFMR developsnode dependent energy-efficient localized route path, improving the *** energy-aware framework maximizes the throughput rate and performs experimental evaluation on factors such as energy consumption rate during routing,Throughput, RST, node density and average energy per packet in WSN. The RouteSearching Time (RST) is reduced using the Boltzmann Distribution (BD), and as aresult, the energy is minimized on multi-user WSN. Finally, GIFM applies aninstance time difference-based route searching on WSN to attain an optimal energyminimization system. Experimental analysis shows that the EPFMR framework canreduce the RST by 23.47% and improve the throughput by 6.79% compared withthe state-of-the-art works.

关键词： Wireless sensor network proportional fairness multi-user routing energy consumption greedy instance fair Boltzmann distribution

Sonication method synergism with rare earth based nanocatalyst:preparation of NiFe_(2–x)Eu_xO_4 nanostructures and its catalytic applications for the synthesis of benzimidazoles,benzoxazoles,and benzothiazoles under ultrasonic irradiation

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Journal of Rare Earths 2017年第4期35卷 374-381页

作者： abolfazl Ziarati Ali Sobhani-Nasab Mehdi Rahimi-Nasrabadi Mohammad Reza Ganjali Alireza Badiei School of Chemistry College of Science University of TehranTehran ***lran Young Researchers and Elite Club Arak BranchIslamic Azad UniversityArak ***Iran Faculty of Pharmacy Baqiyatallah University of Medical SciencesTehran ***lran Department of Chemistry Imam Hossein UniversityTehran ***lran Center of Excellence in Electrochemistry University of TehranTehran *** lran

A simple and practical ultrasonically synthetic strategy for the preparation of rare-earth based catalyst, nanostructured NiFe2-xEuxO4 was developed. The structtre of NiFe2-xEuxO4 was characterized by various analyses such as X-ray diffraction （XRD）, scanning electron microscopy （SEM） and fourier transform infrared spectroscopy （FT-IR）. The catalytic performance of NiFe2-xEuxO4 was evaluated for the synthesis of benzimidazoles, benzoxazoles and benzothiazoles under ultrasonic irradiation. All reactions were completed in short times and all products were obtained in good to excellent yields in presence of the rare-earth based catalyst. Besides, NiFe2-xEuxO4 could be recovered for 6 times without noticeably decreasing the catalytic activity.

关键词： rare earths organic reactions nanocatalyst ultrasonic irradiation

Intelligent solubility estimation of gaseous hydrocarbons in ionic liquids

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Petroleum 2024年第1期10卷 109-123页

作者： Behnaz Basirat Fariborz Shaahmadi Seyed Sorosh Mirfasihi abolfazl Jomekian Bahamin Bazooyar Ahvaz Faculty of Petroleum Engineering Petroleum University of Technology(PUT)Ahvaz***Iran School of Engineering&Physical Sciences Heriot Watt UniversityEdinburgh EH144ASUK Department of Fluids&Environment The University of ManchesterManchesterM139PLUK Department of Engineering Chemical Engineering GroupEsfarayen University of TechnologyIran Mechanical and Aerospace Engineering Brunel University LondonUxbridge UB83PHUK

The research focuses on evaluating how well new solvents attract light hydrocarbons,such as propane,methane,and ethane,in natural gas sweetening *** is important to accurately determine the solubility of hydrocarbons in these solvents to effectively manage the sweetening *** address this challenge,the study proposes using advanced empirical models based on artificial intelligence techniques like Multi-Layer Artificial Neural Network(ML-ANN),Support Vector Machines(SVM),and Least Square Support Vector Machine(LSSVM).The parameters for the SVM and LSSVM models are estimated using optimization methods like Genetic Algorithm(GA),Particle Swarm Optimization(PSO),and Shuffled Complex Evolution(SCE).Data on the solubility of propane,methane,and ethane in various ionic liquids are collected from reliable literature sources to create a comprehensive *** proposed artificial intelligence models show great accuracy in predicting hydrocarbon solubility in ionic *** these,the hybrid SVM models perform exceptionally well,with the PSO-SVM hybrid model being particularly efficient *** ensure a comprehensive analysis,different examples of hydrocarbons and their order are ***,a comparative analysis is conducted to compare the AI models with the thermodynamic COSMO-RS model for solubility *** results demonstrate the superiority of the AI models,as they outperform traditional thermodynamic models across a wide range of *** conclusion,this study introduces advanced artificial intelligence algorithms such as ML-ANN,SVM,and LSSVM in accurately estimating the solubility of hydrocarbons in ionic *** incorporation of optimization techniques and variations in hydrocarbon examples improves the accuracy,precision,and reliability of these intelligent *** findings highlight the significant potential of AI-based approaches in solubility analysis and emphasize their superiority over traditional thermodynami

关键词： Solubility Gaseous hydrocarbon Intelligent models Ionic liquids

Flotation techniques to improve viability of Juniperus polycarpos seed lots

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Journal of Forestry Research 2017年第2期28卷 231-239页

作者： abolfazl Daneshvar Mulualem Tigabu Asaddollah Karimidoost Per Christer Odén Southern Swedish Forest Research Centre Swedish University of Agricultural SciencesP.O.Box 49SE-230 53 AlnarpSweden Department of Natural Resources Gonbad Kavoos UniversityShahid Fallahi StreetP.O.Box 163GonbadIran Agriculture and Natural Resources Research Center of Golestan Province Beheshti Ave.P.O.Box ***GorganIran

The germination of freshly collected Juniperus polycarpos（K. Koch） seeds is very low and attributed to the large proportion of nonviable seeds in the seed ***, the aim of this study was to improve seed lot quality by removing nonviable seeds using two flotation techniques： incubation-drying-separation（IDS） and modified specific gravity（MSG） separation. We examined different IDS conditions（the specific incubation time, subsequent drying time and sorting media） for effectively sorting out nonviable seeds; and tested the feasibility of modified SG separation, which involved soaking seeds in water for a certain period before sorting in different concentrations of sucrose solution. Viable seeds were expected to absorb and metabolically bind more water during soaking than dead seeds could, and hence be sorted effectively depending on the viscosity of the sucrose solution. The viability of the seeds that floated or sank was determined in a topographical tetrazolium chloride（TTC） test. For the IDS trial,7 days incubation followed by 9 h of drying and sedimentation in pure water or 200 g L-1sucrose solution identified, respectively, 75 and 82 % of the seeds as viable（sunken） seeds. For the MSG trail, 77 % viable seeds were recovered in the sunken fraction when seeds were soaked for 48 h then immediately sorted in 600 g L-1sucrose solution. In both cases, the loss of viable seeds in the discarded floating fraction was only 4 %. The results demonstrate that both IDS and MSG separation techniques substantially improved seed lot viability, but MSG separation is simple and needs no modern seed handling facility, and its efficacy relies on seed mass（due to the initial soaking） and the specific density and viscosity of the flotation medium.

关键词： viable viability sorting sucrose tetrazolium incubation subsequent viscosity proportion immediately

Process mineralogy as a key factor affecting the flotation kinetics of copper sulfide minerals

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 430-439页

作者： Ataallah Bahrami Mirsaleh Mirmohammadi Yousef Ghorbani Fatemeh Kazemi Morteza Abdollahi abolfazl Danesh Department of Mining Engineering Urmia University School of Mining Engineering College of EngineeringUniversity of Tehran Department of Civil Environmental & Natural Resources EngineeringLule? University of Technology Complex of Copper Processing-Sungun

The aim of this study is to apply process mineralogy as a practical tool for further understanding and predicting the flotation kinetics of the copper sulfide minerals. The minerals' composition and association, grain distribution, and liberation within the ore samples were analyzed in the feed, concentrate, and the tailings of the flotation processes with two pulp densities of 25 wt% and 30 wt%. The major copper-bearing minerals identified by microscopic analysis of the concentrate samples included chalcopyrite(56.2 wt%), chalcocite(29.1 wt%),covellite(6.4 wt%), and bornite(4.7 wt%). Pyrite was the main sulfide gangue mineral(3.6 wt%) in the concentrates. A 95% degree of liberation with d_(80) > 80 μm was obtained for chalcopyrite as the main copper mineral in the ore sample. The recovery rate and the grade in the concentrates were enhanced with increasing chalcopyrite particle size. Chalcopyrite particles with a d_(80) of approximately 100 μm were recovered at the early stages of the flotation process. The kinetic studies showed that the kinetic second-order rectangular distribution model perfectly fit the flotation test data. Characterization of the kinetic parameters indicated that the optimum granulation distribution range for achieving a maximum flotation rate for chalcopyrite particles was between the sizes 50 and 55 μm.

关键词： microscopic analysis flotation kinetics second order rectangular distribution model sulphide minerals

Estimation of sediment load and erosion of different geological units: A case study from a basin of north-eastern Iran

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Journal of Mountain Science 2021年第6期18卷 1591-1608页

作者： Maryam TAJBAKHSHIAN abolfazl MOSAEDI Mohamad Hosein MAHMUDY GHARAIE Sayyed Reza MOUSSAVI HARAMI Department of Geology Ferdowsi University of MashhadMashhad ***Iran Department of Water Science and Engineering Ferdowsi University of MashhadMashhad ***Iran

Erosion of geological units and sediment load in rivers can be considered as the serious problems in recent *** sediment loads generate major hazards for water resources development,particularly in terms of loss of reservoir storage due to sedimentation and siltation of water distribution *** this paper,the performance of four sediment rating curve (SRC) development methods was evaluated for the Shirin Darreh River(SDR) basin (1750 km^(2)),located in North Khorasan Province,*** of flow discharge (Q) and suspended sediment flux (SSF)(Q-SSF pairs,N=957)and daily flow discharge,recorded by the Regional Water Company of North Khorasan (RWCNK) at the Qaleh-Barbar (QB) gauging site during 1989-2018 were *** flow discharge classification method performed best by meeting the desired criteria of most statistical indices,including normalized root mean square error (NRMSE),mean bias error (MBE),mean absolute error (MAE),index of agreement (d),and coefficient of determination (R^(2)).Based on the optimized method,the rate of suspended sediment transportation at the study site was estimated about2.7×10^(6) ton year^(-1).Erodibility of the exposed formations in the study area was estimated based on a factorial scoring model (FSM).Three indices,focused on the outcrop and erodibility,were calculated for the geological units at sub-basin and total *** deposits are the most extensive geological unit in the three sub-basins and the maximum formation outcrop ratio (FOR) and participation in erosion (PCE)were obtained for these rocks at total *** fact,marl unit can be regarded as the main source to supply the suspended sediments in the study basin.

关键词： Geological units Sediment rating curve Flow discharge Suspended sediment concentration Erodibility

Improvement of corrosion performance of 316L stainless steel via PVTMS/henna thin film

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Progress in Natural Science:Materials International 2012年第5期22卷 392-400页

作者： abolfazl Motalebi Mojtaba Nasr-Esfahani Rania Ali Mehdi Pourriahi Department of Materials Science and Engineering Najafabad BranchIslamic Azad UniversityIsfahan 85141-43131Iran Department of Materials Science Institute for Surface Science and Corrosion(LKO)University of Erlangen-NurembergMartensstrasse 7D-91058 ErlangenGermany

Metallic materials are the most used materials as orthopedic or dental implants due to their excellent mechanical *** they are not able to create a natural bonding with the mineralized bone and occasionally suffer localized *** work describes the electrochemical behavior of a hybrid sol-gel thin film with the addition of green *** films enhance the ability of the implant to make a union with the existing bone and improve its resistance to aggressive *** ethanol solution of the polymerized vinyltrimethoxysilane(PVTMS) was mixed with an aqueous solution of henna extract(Lawsonia inermis) and refluxed to give homogeneous *** hybrid PVTMS/henna thin films were deposited on the stainless steel 316L by *** morphology,composition and adhesion of hybrid sol-gel coatings have been examined by SEM,EDX and pull-off test,*** of high additive concentrations(0.1%) did not disorganize the sol-gel *** pull-off test recorded a mean coating-substrate bonding strength larger than 20.6 MPa for the hybrid sol-gel *** effect of henna extract,with various added concentrations from 0.012% to 0.1%,on the anticorrosion properties of sol-gel films have been characterized by electrochemical impedance spectroscopy(EIS) and potentiodynamic polarization tests in simulated body fluid(SBF) solution and has been compared to the bare *** extract additions(0.05%) have significantly increased the corrosion protection of the sol-gel thin film to higher than 90%.The in vitro bioactivity of prepared films indicates that hydroxyapatite nuclei can form and grow on the surface of the doped sol-gel thin *** present study shows that due to their excellent anticorrosion properties,bioactivity and bonding strength to substrate,doped sol-gel thin films are practical hybrid films in biomedical applications.

关键词： Green corrosion inhibitor Henna extract Sol-gel coating Corrosion 316L

DEM simulation of confining pressure effects on crack opening displacement in hydraulic fracturing

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International Journal of Mining Science and Technology 2016年第4期26卷 557-561页

作者： Abdollahipour abolfazl Fatehi Marji Mohammad Yarahmadi Bafghi Alireza Gholamnejad Javad Faculty of Mining and Metallurgical Engineering Yazd University

Hydraulic fracture is one of the key methods in well stimulation to increase production of oil and *** Opening Displacement(COD) is of great importance in this method since it is in direct relation with permeability and production *** this paper COD is measured by a distinct element model which has been validated by an exact solution.A comprehensive study has been performed on confining pressure effect on COD which is neglected in the analytical *** results showed that confining pressure considerably affects COD.A multi-parameter regression(considering effect of confining pressure,rock mass properties and fluid pressure) was performed on numerical results which resulted in an *** proposed equation considers the effect of confining pressure and its results are in good agreement with numerical results.

关键词： Hydraulic lracture COD Numerical analysis Confining pressure Regression

SnCl_2/nano SiO_2: A green and reusable heterogeneous catalyst for the synthesis of polyfunctionalized 4H-pyrans

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Chinese Chemical Letters 2013年第10期24卷 921-925页

作者： Javad Safaei-Ghomi Raheleh Teymuri Hossein Shahbazi-Alavi abolfazl Ziarati Department of Organic Chemistry Faculty of ChemistryUniversity of Kashan

A highly efficient and general method for the synthesis of polyfunctionalized 4H-pyrans is established through a one-pot multicomponent cyclocondensation of aromatic aldehydes with CH acids, malononitrile and ethyl acetoacetate using nano silica supported tin （II） chloride as a catalyst. In this method SnCl2/nano Si02 was used as green and reusable catalyst. Excellent yields, short reaction times, simple workup, and inexpensiveness and commercially availability of the catalyst are the advantages of this method.

关键词： Nano silica supported tin (11) chloride Polyfunctionalized 4H-pyrans Multicomponent reactions Heterogeneous catalyst