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Abrasive Wear Behavior of High Chromium Cast Iron and Hadfield Steel-A Comparison

Journal of Iron and Steel Research International 2012年第4期19卷 43-50页

作者： Mehdi Mazar Atabaki sajjad jafari Hassan Abdollah-pour Department of Materials Engineering Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81310Malaysia Institute for Materials Research School of ProcessEnvironmental and Materials EngineeringFaculty of EngineeringUniversity of LeedsLeeds LS29JTUK Department of Materials Engineering Faculty of EngineeringSemnan UniversitySemnan 85138-33931Iran

Wear properties of two different crushers used for grinding raw materials of cement industry are compared using pin-on-disk wear *** wear test was carried out with different loads on a *** wear behavior of two alloys was evaluated by comparing mass loss,wear resistance,microhardness and friction *** microstructure of the specimens was detected using optical *** results showed that abrasive wear of high chromium cast iron is lower than that of Hadfield *** to the presence of M7C3 carbides on the high chromium cast iron matrix,impact crushers exhibited higher friction coefficient

关键词： abrasive wear Hadfield steel high chromium cast iron

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Temperature effect on performance of nanoparticle/surfactant flooding in enhanced heavy oil recovery

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Petroleum Science 2019年第6期16卷 1387-1402页

作者： sajjad Mahmoudi Arezou jafari Soheila Javadian Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Physical Chemistry Faculty of Basic ScienceTarbiat Modares UniversityP.O.Box 14115-175TehranIran

Recently,nanoparticles have been used along with surfactants for enhancing oil *** the recent studies show that oil recovery is enhanced using nanoparticle/surfactant solutions,some effective parameters and mechanisms involved in the oil recovery have not yet been ***,the temperature effect on the stability of nanoparticle/surfactant solutions and ultimate oil recovery has been studied in this work,and the optimal concentrations of both SiO2 nanoparticle and surfactant(sodium dodecyl sulfate)have been determined by the Central Composite Design *** addition,the simultaneous effects of parameters and their interactions have been *** of the stability of the injected solutions indicates that the nanoparticle concentration is the most important factor affecting the solution *** surfactant makes the solution more stable if used in appropriate concentrations below the *** to the micromodel flooding results,the most effective factor for enhancing oil recovery is temperature compared to the nanoparticle and surfactant ***,in floodings with higher porous medium temperature,the oil viscosity reduction is considerable,and more oil is *** addition,the surfactant concentration plays a more effective role in reservoirs with higher *** other words,at a surfactant concentration of 250 ppm,the ultimate oil recovery is improved about 20%with a temperature increase of 20°***,when the surfactant concentration is equal to 750 ppm,the temperature increase enhances the ultimate oil recovery by only about 7%.Finally,the nanoparticle and surfactant optimum concentrations determined by Design-Expert software were equal to 46 and 159 ppm,*** is worthy to note that obtained results are validated by the confirmation test.

关键词： Enhanced heavy oil recovery Nanoparticle Surfactant Temperature High salinity brine Stability Micromodel Experimental design

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Collective behavior of cortico-thalamic circuits:Logic gates as the thalamus and a dynamical neuronal network as the cortex

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Chinese Physics B 2022年第2期31卷 687-695页

作者： Alireza Bahramian sajjad Shaukat Jamal Fatemeh Parastesh Kartikeyan Rajagopal Sajad jafari Department of Biomedical Engineering Amirkabir University of Technology(Tehran polytechnic)Iran Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia Centre for Nonlinear Systems Chennai Institute of TechnologyChennaiIndia Health Technology Research Institute Amirkabir University of Technology(Tehran polytechnic)Iran

This paper introduces a two-layer network to investigate the effects of cortico-thalamic circuits on the cortex’s collective *** the brain,different parts of the cortex collaborate to process *** of the main parts,which is the path of different cortex contacts,is the thalamus whose circuit is referred to as the"vertical"cortico-thalamic *** subnuclei can participate in the processing of the information that passes through *** has been shown that they play the functional role of logic gates(AND,OR and XOR).To study how these thalamus circuits affect the cortical neuron behavior,a two-layer network is proposed wherein the cortex layer is composed of Hindmarsh–Rose models and the thalamus layer is constructed with logic *** show that considering these logic gates can lead the network towards different synchronization,asynchronization,chimera and solitary *** is revealed that for AND-gate and OR-gate,increasing the number of gates or their outputs can increase and decrease the network’s coherency in excitatory and inhibitory cases,***,considering XOR-gates always results in the chimera state.

关键词： two-layer network synchronization chimera state thalamus and cortex

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