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RISS 인기검색어
- 검색키워드
- 저자 : Amir Torabi (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Mixed Thermo elastohydrodynamic lubrication analysis of finite length cam and follower mechanism
Amir Torabi,Saleh Akbarzadeh,Mohammad Reza Salimpour 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3
A considerable portion of the power loss in a valve train mechanism is due to the losses in the cam follower mechanism. The surface of cam and follower experience counterformal contact with a varying nature that makes it a difficult component in an engine to model. Transient contact geometry and entraining may cause the inlet boundary reversal and short lived cessation of entraining motion which can lead to mixed regime of lubrication. Thermal effects and side leakage intensify the adverse governing tribological condition. This paper presents a thermo-elastohydrodynamic model with considering roughness of surfaces for a finite length cam-follower mechanism. Temperature variation, friction coefficient, and film thickness are the outputs of this model which can be used to evaluate the performance of this mechanical element. The results are validated by comparison to other published data. The results show that thermal effects, side leakage and roughness of contacting surfaces play an important role in the tribological performance of the mechanism. A friction analysis considering a comprehensive asperity interaction model is conducted to investigate the proposed lubrication model capability.
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Controlled Synchronization of Nonlinear Teleoperation in Task-space with Time-varying Delays
Amir Zakerimanesh,Farzad Hashemzadeh,Ali Torabi,Mahdi Tavakoli 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8
This paper introduces a novel control framework for bilateral teleoperation system with the redundant remote robot to ensure the end-effectors’ position tracking while satisfying a sub-task control such as obstacle avoidance in the presence of the nonlinear dynamics for the manipulators and bounded time-varying delays in the communication channels. The asymptotic stability of the closed-loop dynamics is studied using a Lyapunov-Krasovskii functional under conditions on the controller parameters and the maximum values of time-varying delays. Simulation and experimental results are provided to validate the theoretical findings.
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Amir-Hassan Zarnani,Monireh Torabi-Rahvar,Mahmood Bozorgmehr,Mehri Zareie,Nazanin Mojtabavi 대한암학회 2015 Cancer Research and Treatment Vol.47 No.3
Purpose Targeted immunotherapy using dendritic cells (DCs) has been employed in numerous investigations aiming at combating neoplasms. We previously showed that copulsing of an antigen with a helper protein could considerably enhance antigen presenting capacity of ex vivo–generated DCs. In this study, we attempted to administer an effective treatment in a murine model of colon cancer with DCs pulsed with the mixture of a tumor-specific gp70-derived peptide (AH1) and a helper protein, ovalbumin (OVA). Materials and Methods First, the presence of gp70 in CT26 tumor cells and tumor tissues was verified using immunofluorescence and Western blot analyses. Next, DCs were purified from normal mice, loaded ex vivowith AH1 and OVA (DC-Pep-OVA), and injected into tumor-bearing mice. Tumor volume, in vitro antigen (Ag)-specific proliferation of splenic cells, and survival rate were measured to determine the efficacy of DC-Pep-OVA. As the control groups, tumor-bearing mice were vaccinated with DC-Pep, unpulsed DC, and DCs loaded with a mixture of OVA and an irrelevant peptide (P15), or were not vaccinated at all. Results DC-Pep-OVA showed superior efficacy over other groups, as indicated by smaller tumor volume, higher Ag-specific proliferation rate of splenic cells, and prolonged survival. Conclusion Overall, in the present study we showed for the first time that DCs copulsed with AH1 (tumor Ag) and OVA (helper molecule) could be considered as potentially robust weapons for use in future antitumor immunotherapies.
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Fabrication of thin porous electrolyte-supported tubular fuel cells using slip casting
Amir Reza Hanifi,Alireza Torabi,Alyssa Shinbine,Thomas H. Etsell,Partha Sarkar 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
In the current research the third generation of tubular solid oxide fuel cells (SOFCs) which is believed to solve the redox cycling problem is introduced and the cell configuration is discussed. This type of ceramic fuel cell consists of a slip cast porous support of approximately 500 μm thickness coated with a thin dense electrolyte layer both made of calcined YSZ. The porous support can have up to 50% porosity as a result of both the preliminary calcination of YSZ powder and the addition of a pore former. Different parameters that affect the porosity content and thickness of the supports are also studied. It is shown that the short casting time required for high porosity tubes can be controlled by modifying the solid loading of the slip and/or the porosity of the plaster mold. Finally, multiple casting is introduced as a coating method in which the electrolyte layer with the required thickness can be slip cast directly onto the porous support.
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A program for cost estimation of forest road construction using engineer’s method
Ismael Ghajar,Akbar Najafi,Amir Mohsen Karimimajd,Kevin Boston,Seyed Ali Torabi 한국산림과학회 2013 Forest Science And Technology Vol.9 No.3
Modeling the cost of road construction is a prerequisite for evaluation and planning of different alternatives for low-volume road networks included in a forest management plan. In this paper, a model for cost estimation of forest roads is presented, based on the standard engineering properties of cross sections and the location-specific parameters of terrain slope and vegetation information. The model assumes six main cost elements of clearing operations, embankment, pavement, grading, culverts and ditch for total construction cost calculation. To validate the performance, the outputs of the model were compared with the experts’ prediction for an existing forest road project in a mountain condition. The final result of the research showed that the model could estimate total cost of road construction in an accuracy range of 6.5%. The results of the validation process showed a 66.51% underestimate for clearing operation, 3.56% underestimate for embankment, 3.85% underestimate for surfacing, 3.32% underestimate for culverts, 20.54% underestimate for ditch excavation, and 22.33% overestimate for grading of the cut slope and travel way. According to the reasonable estimation for total cost, the model could be applied as an evaluation function in finding the optimized layout of a forest road network.
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