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Processing map for hot working of SiC_p/7075 Al composites

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Transactions of Nonferrous metals Society of China 2010年第4期20卷 668-674页

作者： m.RAJAmUTHAmILSELVAN S.RAmANATHAN R.KARTHIKEYAN Department of manufacturing Engineering Annamalai University Department of mechanical Engineering Birla Institute of Technology and Sciences

The hot deformation behaviour of 7075 aluminium alloy reinforced with 10%of SiC particles was studied by employing both"processing maps"and microstructural *** composite was characterized by employing optical microscope to evaluate the microstructural transformations and instability *** material investigated was deformed by compression in the temperature and strain rate ranges of 300-500℃and 0.001-1.0 s-1,*** deformation efficiency was calculated by strain rate sensitivity(m)values obtained by hot compression *** power dissipation efficiency and instability parameters were evaluated and processing maps were constructed for strain of *** optimum domains and instability zone were obtained for the *** optimum processing conditions are obtained in the strain rate range of 0.1-0.9 s-1and temperature range of 390-440 ℃with the efficiency of 30%.

关键词： hot deformation processing maps recrystallization flow instability

Propagation of an electromagnetic soliton in an anisotropic biquadratic ferromagnetic medium

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Chinese Physics B 2013年第3期22卷 275-281页

作者： L.Kavitha m.Saravanan D.Gopi Department of Physics Periyar University The Abdus Salam International Centre for Theoretical Physics TriesteItaly Center for Nanoscience and Nanotechnology Periyar University Department of Chemistry Periyar University

Information storage technology based on anisotropic ferromagnets with sufficiently high magneto-optical effects has received much attention in recent ***-optical recording combines the merits of magnetic and optical *** investigate the magneto-optical effects on a biquadratic ferromagnet and show that the dynamics of the system are governed by a perturbed nonlinear Schro¨dinger *** evolutions of amplitude and velocity of the soliton are found to be time independent,thereby admitting the lossless propagation of the electromagnetic soliton in the medium,which may have potential applications in soliton based optical communication *** also exploit the role of perturbation,which has a significant impact on the propagation of an electromagnetic soliton.

关键词： solitons classical spin models maxwell equations nonlinear dynamics

Nonlocal buckling of embedded magnetoelectroelastic sandwich nanoplate using refined zigzag theory

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Applied mathematics and mechanics(English Edition) 2018年第4期39卷 529-546页

作者： A.GHORBANPOUR-ARANI F.KOLAHDOUZAN m.ABDOLLAHIAN Faculty of mechanical Engineering University of Kashan Institute of Nanoscience & Nanotechnology University of Kashan

This paper is concerned with a buckling analysis of an embedded nanoplate integrated with magnetoelectroelastic(mEE) layers based on a nonlocal magnetoelectroelasticity theory. A surrounding elastic medium is simulated by the Pasternak foundation that considers both shear and normal loads. The sandwich nanoplate(SNP) consists of a core that is made of metal and two mEE layers on the upper and lower surfaces of the core made of Ba Ti O3/Co Fe2 O4. The refined zigzag theory(RZT) is used to model the SNP subject to both external electric and magnetic potentials. Using an energy method and Hamilton’s principle, the governing motion equations are obtained, and then solved analytically. A detailed parametric study is conducted, concentrating on the combined effects of the small scale parameter, external electric and magnetic loads, thicknesses of mEE layers, mode numbers, and surrounding elastic medium. It is concluded that increasing the small scale parameter decreases the critical buckling loads.

关键词： sandwich nanoplate(SNP) refined zigzag theory(RZT) nonlocal magnetoelectroelasticity theory buckling magnetostrictive layer

L~∞ CONVERGENCE OF TRUNC ELEmENT FOR THE BIHARmONIC EQUATION

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Journal of Computational mathematics 1997年第1期15卷 14-22页

作者： m. Wang(Department of mathematics, Beijing University, Beijing, China) 北京大学数学系北京

The paper considers the L∞ convergence for TRUNC finite elements solving the boundary value problems of the biharmonic equation. The nearly optimal L∞ estimates for the error of first order derivatives are *** TRUNC plate element is proposed and developed by Argyris et al.. The numerical experiences show that the element has very good .***,[1l2]. The mathematicalproof of convergence of the TRUNC element is given by Shi Zong-ci in paper [3]. Thispaper will consider the L~∞ convergence for the TRUNC plate element.

关键词：双谐波方程边值问题收敛性有限元法

Non-monotonic temperature evolution of nonlocal structure–dynamics correlation in CuZr glass-forming liquids

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Chinese Physics B 2021年第7期30卷 370-375页

作者： W J Jiang m Z Li Department of Physics and Beijing Key Laboratory of Opto-electronic Functional materials&micro-nano Devices Renmin University of ChinaBeijing 100872China

The structure–dynamics correlations in a nonlocal manner were investigated in CuZr metallic glass-forming liquids via classical molecular dynamics simulations.A spatial coarse-graining approach was employed to incorporate the nonlocal structural information of given structural order parameters in the structure–dynamics *** is found that the correlation between structure order parameters and dynamics increases with increasing coarse-graining length and has a characteristic length ***,the characteristic correlation length exhibits a non-monotonic temperature evolution as temperature approaches glass transition temperature,which is not sensitive to the considered structure order *** results unveil a striking change in the structure–dynamics correlation,which involves no fitting theoretical *** findings provide new insight into the structure–dynamics correlation in glass transition.

关键词： metallic glass-forming liquid structure–dynamics correlation molecular dynamics simulation

Analysis of surface roughness of rock dust reinforced AA6061-mg matrix composite in turning

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Journal of magnesium and Alloys 2021年第5期9卷 1686-1693页

作者： R.Balachandhar R.Balasundaram m.Ravichandran Department of mechanical Engineering Pavender Barathidasan College of Engineering and TechnologyTiruchirappalli620024Tamil NaduIndia Department of mechanical Engineering K.Ramakrishnan College of EngineeringTiruchirappalli621112Tamil NaduIndia Department of mechanical Engineering SRM Institute of Science and TechnologyTiruchirappalli Campus621105Tamil NaduIndia

This work,examines the Surface Roughness(SR)of composite consisting Aluminium alloy(AA6061),magnesium and Rock dust during turning *** study the performance,three different test specimens with different constituents of Al 6061-T6,AZ31 and Rock dust were prepared by stir casting *** experiments were carried out using mTAB Siemens-CNC *** input parameters for machining are speed,depth of cut&feed and output response is surface roughness For each test specimen,there are 15 turning operations were performed using Box-Ben hen Design *** analyze the process parameters for SR,the models of ANOVA and Decision Tree(DT)algorithms were *** algorithms are confirmed that,speed is the most significant factor for *** addition of AZ 31 with 1%and rock dust of 2%in AA6061 produced better surface *** models of linear regression,multilayer perception and support vector regression from data science were formulated to find the relationship between *** these models multi layer perception produced minimum root mean square error.

关键词： Composite Turning Surface roughness Anova Decision tree Regression

Time gap for temporal cloak based on spectral hole burning in atomic medium

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Chinese Physics B 2016年第8期25卷 175-180页

作者： Abdul Jabar m S Bakht Amin Bacha Iftikhar Ahmad Department of Physics University of Malakand

We demonstrate the possibility of creating a time gap in the slow light based on spectral hole burning in a fourlevel Doppler broadened sodium atomic system. A time gap is also observed between the slow and the fast light in the hole burning region and near the burnt hole region, respectively. A cloaking time gap is attained in microseconds and no distortion is observed in the transmitted pulse. The width of the time gap is observed to vary with the inverse Doppler effect in this system. Our results may provide a way to create multiple time gaps for a temporal cloak.

关键词： temporal cloak susceptibility slow and fast light spectral holes

Preyminary Investigations on the Global Summer monsoonal Drought mechanics and the Latitudinal Teleconnections

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Advances in Atmospheric Sciences 1990年第3期7卷 261-274页

作者： m.Sankar-Rao Department of Aerospace Engineering & Centre for Atmospheric Sciences Indian Institute of Science Bangalore Indiahe question of possible teleconnections between the middle latitude general circulation and the Indian south-west monsoon was investigated in this paper. Within the framework of a simple model it was shown that there can exist such an interaction via the ultra-long Rossby waves.

The question of possible teleconnections between the middle latitude general circulation and the Indian south-west monsoon was investigated in this paper. Within the framework of a simple model it was shown that there... 详细信息

关键词： over Preyminary Investigations on the Global Summer monsoonal Drought mechanics and the Latitudinal Teleconnections

Radial variations in xylem sap flux in a temperate red pine plantation forest

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Ecological Processes 2021年第1期10卷 328-336页

作者： Alanna V.Bodo m.Altaf Arain School of Earth Environment and SocietyMcMaster UniversityHamiltonONCanada mcmaster Centre for Climate Change HamiltonONCanada

Background:Scaling sap flux measurements to whole-tree water use or stand-level transpiration is often done using measurements conducted at a single point in the sapwood of the tree and has the potential to cause significant *** studies have shown that much of this uncertainty is related to(i)measurement of sapwood area and(ii)variations in sap flow at different depths within the tree ***:This study measured sap flux density at three depth intervals in the sapwood of 88-year-old red pine(Pinus resinosa)trees to more accurately estimate water-use at the tree-and stand-level in a plantation forest near Lake Erie in Southern Ontario,*** showed that most of the water transport(65%)occurred in the outermost sapwood,while only 26%and 9%of water was transported in the middle and innermost depths of sapwood,***:These results suggest that failing to consider radial variations in sap flux density within trees can lead to an overestimation of transpiration by as much as 81%,which may cause large uncertainties in water budgets at the ecosystem and catchment *** study will help to improve our understanding of water use dynamics and reduce uncertainties in sap flow measurements in the temperate pine forest ecosystems in the Great Lakes region and help in protecting these forests in the face of climate change.

关键词： Sap flow Transpiration Water use Red pine Temperate forest Great Lakes region