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Vibration analysis of multi-walled carbon nanotubes embedded in elastic medium

Frontiers of Structural and Civil Engineering 2014年第2期8卷 151-159页

作者： Pattabhi R. BUDARAPU Sudhir Sastry YB brahmanandam javvaji D. Roy MAHAPATRA Institute of Structural Mechanics Bauhaus University of Weimar Weimar 99423 Germany Deptarment of Aeronautical Engineering Institute of Aeronautical Engineering Hyderabad 500043 India Department of Aerospace Engineering Indian Institute of Science Bangalore 560012 India

We propose a method to estimate the natural frequencies of the multi-walled carbon nanotubes （MWCNTs） embedded in an elastic medium. Each of the nested tubes is treated as an individual bar interacting with the adjacent nanotubes through the inter-tube Van der Waals forces. The effect of the elastic medium is introduced through an elastic model. The mathematical model is finally reduced to an eigen value problem and the eigen value problem is solved to arrive at the inter-tube resonances of the MWCNTs. Variation of the natural frequencies with different parameters are studied. The estimated results from the present method are compared with the literature and results are observed to be in close agreement.

关键词： natural frequencies multi-walled carbon nanotubes (MWCNTS) elastic medium

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Planetary-Scale Wave Structures of the Earth's Atmosphere Revealed from the COSMIC Observations

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Journal of Meteorological Research 2014年第2期28卷 281-295页

作者： S.K.A.V.Prasad Rao ANISETTY P.S.brahmanandam G.UMA A.Narendra BABU 黄清勇 G.Anil KUMAR S.Tulasi RAM 王筱岚朱延祥 Department of Atmospheric Sciences National Central University Institute of Space Science National Central University Department of Electronics and Communication Engineering Koneru Lakshmmaih University Department of Electronics and Communication Engineering Lakkireddy Bali Reddy Engineering College Department of Physics K L University Indian Institute of Geomagnetism

GPS radio occultation（GPS RO） method,an active satellite-to-satellite remote sensing technique,is capable of producing accurate,all-weather,round the clock,global refractive index,density,pressure,and temperature profiles of the troposphere and *** study presents planetary-scale equatorially trapped Kelvin waves in temperature profiles retrieved using COSMIC（Constellation Observing System for Meteorology,Ionosphere,and Climate） satellites during 2006-2009 and their interactions with background atmospheric *** is found that the Kelvin waves are not only associated with wave periods of higher than 10 days（slow Kelvin waves） with higher zonal wave numbers（either 1 or 2）,but also possessing downward phase progression,giving evidence that the source regions of them are located at lower altitudes.A thorough verification of outgoing longwave radiation（OLR） reveals that deep convection activity has developed regularly over the Indonesian region,suggesting that the Kelvin waves are driven by the convective *** derived Kelvin waves show enhanced（diminished） tendencies during westward（eastward） phase of the quasi-biennial oscillation（QBO） in zonal winds,implying a mutual relation between both of *** El Nino and Southern Oscillation（ENSO） below 18 km and the QBO features between 18 and 27km in temperature profiles are observed during May 2006-May 2010 with the help of an adaptive data analysis technique known as Hilbert Huang Transform（HHT）.Further,temperature anomalies computed using COSMIC retrieved temperatures are critically evaluated during different phases of ENSO,which has revealed interesting results and are discussed in light of available literature.

关键词： radio occultation technique Kelvin waves outgoing long-wave radiation(OLR) quasi-biennial oscillation(QBO) El Nino and Southern Oscillation(ENSO)

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