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Al-Si-SiC过共晶复合材料的显微组织、力学性能和二体磨料磨损行为 被引量:4
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作者 Raj Kumar SINGH Amit TELANG satyabrata das 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第1期65-75,共11页
采用搅拌铸造法制备过共晶Al-Si-Si C复合材料,研究该复合材料及其基体合金的显微组织、力学性能以及滑动距离和材料去除机理对材料二体磨料磨损行为的影响。结果表明,与基体合金相比,复合材料的硬度、极限抗拉强度和屈服强度分别提高17... 采用搅拌铸造法制备过共晶Al-Si-Si C复合材料,研究该复合材料及其基体合金的显微组织、力学性能以及滑动距离和材料去除机理对材料二体磨料磨损行为的影响。结果表明,与基体合金相比,复合材料的硬度、极限抗拉强度和屈服强度分别提高17%、38%和30%,而伸长率降低48%。材料的磨损率随磨料粒度和载荷的增大而增大,不随滑动距离的变化而变化。通过高分辨场发射扫描电镜(HRFESEM)对材料的磨损表面和磨屑进行表征,分析材料在高、低载荷状态下的磨损机理。 展开更多
关键词 金属基复合材料 断面 磨屑分析 二体磨料磨损
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A Resource Management Algorithm for Virtual Machine Migration in Vehicular Cloud Computing 被引量:1
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作者 Sohan Kumar Pande Sanjaya Kumar Panda +5 位作者 satyabrata das Kshira Sagar Sahoo Ashish Kr.Luhach N.Z.Jhanjhi Roobaea Alroobaea Sivakumar Sivanesan 《Computers, Materials & Continua》 SCIE EI 2021年第5期2647-2663,共17页
In recent years,vehicular cloud computing(VCC)has gained vast attention for providing a variety of services by creating virtual machines(VMs).These VMs use the resources that are present in modern smart vehicles.Many ... In recent years,vehicular cloud computing(VCC)has gained vast attention for providing a variety of services by creating virtual machines(VMs).These VMs use the resources that are present in modern smart vehicles.Many studies reported that some of these VMs hosted on the vehicles are overloaded,whereas others are underloaded.As a circumstance,the energy consumption of overloaded vehicles is drastically increased.On the other hand,underloaded vehicles are also drawing considerable energy in the underutilized situation.Therefore,minimizing the energy consumption of the VMs that are hosted by both overloaded and underloaded is a challenging issue in the VCC environment.The proper and efcient utilization of the vehicle’s resources can reduce energy consumption signicantly.One of the solutions is to improve the resource utilization of underloaded vehicles by migrating the over-utilized VMs of overloaded vehicles.On the other hand,a large number of VM migrations can lead to wastage of energy and time,which ultimately degrades the performance of the VMs.This paper addresses the issues mentioned above by introducing a resource management algorithm,called resource utilization-aware VM migration(RU-VMM)algorithm,to distribute the loads among the overloaded and underloaded vehicles,such that energy consumption is minimized.RU-VMM monitors the trend of resource utilization to select the source and destination vehicles within a predetermined threshold for the process of VM migration.It ensures that any vehicles’resource utilization should not exceed the threshold before or after the migration.RU-VMM also tries to avoid unnecessary VM migrations between the vehicles.RU-VMM is extensively simulated and tested using nine datasets.The results are carried out using three performance metrics,namely number of nal source vehicles(nfsv),percentage of successful VM migrations(psvmm)and percentage of dropped VM migrations(pdvmm),and compared with threshold-based algorithm(i.e.,threshold)and cumulative sum(CUSUM)algorithm.The comparisons show that the RU-VMM algorithm performs better than the existing algorithms.RU-VMM algorithm improves 16.91%than the CUSUM algorithm and 71.59%than the threshold algorithm in terms of nfsv,and 20.62%and 275.34%than the CUSUM and threshold algorithms in terms of psvmm. 展开更多
关键词 Resource management virtual machine migration vehicular cloud computing resource utilization source vehicle destination vehicle
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Synthesis and Characterization of Advanced Red Mud and MWCNTs Based EMI Shielding Material via Ceramic Processing
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作者 Sarika Verma Sudhir Sitaram Amritphale satyabrata das 《Materials Sciences and Applications》 2016年第4期192-201,共10页
For the first time in the world advanced multi layered Red Mud and MWCNTs (ARMC) based EMI shielding material has been developed at CSIR-AMPRI, Bhopal. Red mud provides oxides of titanium and iron as precursor and the... For the first time in the world advanced multi layered Red Mud and MWCNTs (ARMC) based EMI shielding material has been developed at CSIR-AMPRI, Bhopal. Red mud provides oxides of titanium and iron as precursor and the MWCNTs provides electrical conductivity characteristics necessary for making desired EMI shielding materials. The novel process involves unique designing of chemical compositions and mineralogical phases of red mud, MWCNTs together with appropriate additive and solvent which results in the simultaneous and synergistic chemical reactions among various constituents thereby forming tailored precursor powder. Further, the ceramic processing of tailored precursor powder in appropriate environment enables formation of advanced ARMC shielding material having a variety of ceramic phases with multi elemental compositions and multi layered crystal structures. The synthesized material was characterized by various techniques namely XRD, PL, FESEM, EDXA. The reflection loss (R. L.) of the sample was calculated based on the measured complex permittivity and permeability. The advanced ARMC material with thickness t = 1.5 mm showed a minimum R. L. of -35.5 Db at 14.0 GHz with a response band width of 1.8 GHz. Thus, the developed advanced ARMC material acts as a good EMI wave absorber. 展开更多
关键词 Red Mud MWCNTS EMI Shielding Ceramic Processing Multilayered Structure
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