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RISS 인기검색어
- 검색키워드
- 저자 : S.C. Pradhan (검색결과 6 건)
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S.C. Pradhan,J.K. Phadikar 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2
In this paper structural analysis of nonhomogeneous nanotubes has been carried out using nonlocal elasticity theory. Governing differential equations of nonhomogeneous nanotubes are derived. Nanotubes include both single wall nanotube (SWNT) and double wall nanotube (DWNT). Nonlocal theory of elasticity has been employed to include the scale effect of the nanotubes. Nonlocal parameter, elastic modulus, density and diameter of the cross section are assumed to be functions of spatial coordinates. General Differential Quadrature (GDQ) method has been employed to solve the governing differential equations of the nanotubes. Various boundary conditions have been applied to the nanotubes. Present results considering nonlocal theory are in good agreement with the results available in the literature. Effect of variation of various geometrical and material parameters on the structural response of the nonhomogeneous nanotubes has been investigated. Present results of the nonhomogeneous nanotubes are useful in the design of the nanotubes.
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Analyses of tapered fgm beams with nonlocal theory
S. C. Pradhan,A. Sarkar 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.6
In the present article bending, buckling and vibration analyses of tapered beams using Eringen non-local elasticity theory are being carried out. The associated governing differential equations are solved employing Rayleigh-Ritz method. Both Euler-Bernoulli and Timoshenko beam theories are considered in the analyses. Present results are in good agreement with those reported in literature. Beam material is considered to be made up of functionally graded materials (fgms). Non-local analyses for tapered beam with simply supported - simply supported, clamped - simply supported and clamped - free boundary conditions are carried out and discussed. Further, effect of length to height ratio on maximum deflections, vibration frequencies and critical buckling loads are studied.
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Analyses of tapered fgm beams with nonlocal theory
Pradhan, S.C.,Sarkar, A. Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.6
In the present article bending, buckling and vibration analyses of tapered beams using Eringen non-local elasticity theory are being carried out. The associated governing differential equations are solved employing Rayleigh-Ritz method. Both Euler-Bernoulli and Timoshenko beam theories are considered in the analyses. Present results are in good agreement with those reported in literature. Beam material is considered to be made up of functionally graded materials (fgms). Non-local analyses for tapered beam with simply supported - simply supported, clamped - simply supported and clamped - free boundary conditions are carried out and discussed. Further, effect of length to height ratio on maximum deflections, vibration frequencies and critical buckling loads are studied.
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Pradhan, S.C.,Phadikar, J.K. Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2
In this paper structural analysis of nonhomogeneous nanotubes has been carried out using nonlocal elasticity theory. Governing differential equations of nonhomogeneous nanotubes are derived. Nanotubes include both single wall nanotube (SWNT) and double wall nanotube (DWNT). Nonlocal theory of elasticity has been employed to include the scale effect of the nanotubes. Nonlocal parameter, elastic modulus, density and diameter of the cross section are assumed to be functions of spatial coordinates. General Differential Quadrature (GDQ) method has been employed to solve the governing differential equations of the nanotubes. Various boundary conditions have been applied to the nanotubes. Present results considering nonlocal theory are in good agreement with the results available in the literature. Effect of variation of various geometrical and material parameters on the structural response of the nonhomogeneous nanotubes has been investigated. Present results of the nonhomogeneous nanotubes are useful in the design of the nanotubes.
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S. Pradhan,U.C. Gupta,S.K. Samanta 한국통계학회 2016 Journal of the Korean Statistical Society Vol.45 No.1
In this paper, we investigate an infinite-buffer queue with batch-arrival and batch-service wherein a single server operates under random serving capacity rule with service time dependent on the size of the batch under the service. First, we derive the probability generating function of state probabilities at service completion epoch, from which an entire spectrum regarding queue-length at various epochs is extracted. Using the departure epoch probabilities, we establish a stable relationship between departure and random epochs probabilities based on ‘rate in = rate out’ approach. Further, random epoch probabilities are used to obtain pre-arrival epoch probabilities. Finally, we illustrate our analytical results by means of numerical computation which includes the case of multiple roots.
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Lee, J.I.,Kim, H.,Kim, J.L.,Pradhan, A.S.,Kim, M.C.,Chang, I.,Lee, S.K.,Kim, B.H.,Park, C.Y.,Chung, K.S. Pergamon Press 2017 Radiation measurements Vol.105 No.-
<P>Luminescence dosimetric properties of inductors and resistors in mobile phones have attracted wide attention for their use in retrospective accident dosimetry. Thermoluminescence (TL) signal following optically stimulated luminescence (OSL) readout, which has been recently shown to be useful for dose re estimation (Lee et al., 2016), when measured by a Risoe OSL reader without a Hoya U-340 optical filter, was found to be up to 85 times of that recorded with the Hoya filter (with transmission window 270-380 nm, necessary for recording the usual OSL signal) placed in front of the photomultiplier tube (PMT) in the reader. In view of this, a study of dosimetric TL properties, namely sample-to-sample variation, fading, zero-dose signal, minimum measurable dose, effect of room light, dose response and emission spectrum, was undertaken to explore the use of TL of inductors and resistors in new generation mobile phones for accident dosimetry. The hitherto unknown TL emission spectrum was found to exhibit an intense emission beyond 550 nm (peaking at 700 nm) when recorded in the range from 250 nm to 750 nm. Emission below 500 nm was smaller by orders of magnitude than that at 700 nm. As the TL and OSL signals have been attributed to alumina substrates of inductors and resistors, the TL emission spectrum was compared with that of dosimetry grade Al2O3:C. The emission spectra of inductors and resistors were found to differ significantly, not only from that of Al2O3:C, but also from each other. Although the differences in TL glow curves, optical emission spectra, fading, etc. Indicated a lack of universality in luminescence properties of alumina substrates in different electronic components, it was concluded that the TL of inductors and resistors in new generation mobile phones offers a better option for accident dosimetry than OSL, with the specific advantage of much lower post-irradiation fading. (C) 2017 Elsevier Ltd. All rights reserved.</P>
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