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  • 1
    Electronic Resource
    Electronic Resource
    Transforming supply chain operations in response to economic reform: the case of a motorcycle manufacturer in India (2004)
    Bingley : Emerald
    Supply chain management 9 (2004), S. 16-22 
    Details
    ISSN: 1359-8546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Economic reforms that stimulate commercial activity in semi-industrialized nations are often associated with significant increases in demand for consumer products. This paper focuses on a description of the transformation of a motorcycle manufacturer's supply chain in response to the recent liberalization of the Indian economy, and on insights gained from that experience. The authors believe that this organization's success in applying supply chain management practices that are more commonly utilized in industrialized nations has wide applicability, and that it will be insightful as a role model for managers at firms facing similar challenges of integrating supply chain operations to meet surges in demand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13598540410517548
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of finite larmor radius and variable gravitational field on thermal instability of fluid layer under rotation in porous medium (1998)
    Springer
    Czechoslovak journal of physics 48 (1998), S. 599-608 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of finite Larmor radius, magnetic field, rotation and variable gravitational field on thermal instability of fluid layer in porous medium is investigated. It is found that the principle of exchange of stability is valid in the absence of magnetic field and rotation. The system is stable/unstable depending upon certain conditions in the presence of rotation, magnetic field and medium permeability. The system is stable in presence of finite Larmor radius.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021273221088
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  • 3
    Electronic Resource
    Electronic Resource
    Lower Bounds on Scalar Dissipation in Bounded Rectilinear Flows (1998)
    Springer
    Flow, turbulence and combustion 60 (1998), S. 125-156 
    Details
    ISSN: 1573-1987
    Keywords: scalar dissipation rate ; concentration ; concentration variance ; longitudinal ; dilution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lower bounds on the scalar dissipation rate in rectilinear flows are found for three sets of constraints. The bounding dissipation rates provide upper bound estimates of the scalar concentration variance. One of the lower bounds on the dissipation rate is close to the dissipation rate assessed from detailed numerical simulation. This proximity enables a simplified model of concentration variance. For a pulse input of solute, the predictions of concentration variance by the simplified model are in agreement with the results of detailed simulation. The large-time bimodality of the concentration variance and its rate of decay observed in the detailed numerical simulations is predicted by the simplified model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009964928826
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration fluctuations and dilution in two-dimensionally periodic heterogeneous porous media (1996)
    Springer
    Transport in porous media 22 (1996), S. 91-119 
    Details
    ISSN: 1573-1634
    Keywords: concentration fluctuations ; peak concentration ; dilution ; heterogeneity ; local dispersion ; microscale ; fluctuation dissipation ; coefficient of variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Dilution of solute in two-dimensionally periodic heterogeneous porous media is assessed by numerically simulating advection-dispersion. The concentration fluctuations, created by advective heterogeneity, are destroyed by local dispersion, over a characteristic variance residence time (VRT). For an impulse introduction of solute, initially, plumes become increasingly irregular with time—the coefficient of variation (CV) of concentration grows with time. A priori, the spatial second moment and mean concentrations are insufficient measures of dilution, because concentration fluctuations can be large. At large times (t 〉 VRT) the relative concentration fluctuations weaken—the concentration CV was observed to slowly decrease with time. At the center of mass the general trend of the decreasing CV follows VRT/t (predicted by Kapoor and Gelhar). The VRT is found to be an increasing function of the log hydraulic conductivity microscale. In employing effective dispersion coefficents to model the mean concentration, it needs to be recognized that excursions of concentrations around the mean are singularly determined by local dispersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00974313
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  • 5
    Electronic Resource
    Electronic Resource
    Vorticity in Three-Dimensionally Random Porous Media (1997)
    Springer
    Transport in porous media 26 (1997), S. 109-119 
    Details
    ISSN: 1573-1634
    Keywords: vorticity ; random porous media ; microscales ; spectral method ; heterogeneity ; random field ; stochastic.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The flow gradient tensor controls the rate of dissipation of concentration fluctuations due to local dispersion, and therefore determines the rate of dilution of solute in a spatially random flow field. Off-diagonal terms of the flow gradient tensor quantify the rotational characteristics of the flow. A leading order description of the vorticity $$(\omega = (\omega _1 ,\omega _2 ,\omega _3 ))$$ , of flow in a three-dimensionally random spatially correlated hydraulic conductivity field $$(K({\text{x}}))$$ is made by relating the vorticity spectrum to the spectrum of ln $$K({\text{x}})$$ . Distinct components of the vorticity are found to be linearly uncorrelated $$(\overline {\omega _i \omega _j } = 0,i \ne j)$$ . The characteristic vorticity component in the bulk flow direction is zero $$(\sigma _{\omega _1 } = 0)$$ , and the characteristic vorticity in the transverse directions $$(\sigma _{\omega _2 } ,\sigma _{\omega _3 } )$$ are inversely proportional to the hydraulic conductivity microscales in the other transverse direction, as exhibited in a numerical calculation of the vorticity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006593712793
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  • 6
    Electronic Resource
    Electronic Resource
    Criterion for instability of steady-state unsaturated flows (1996)
    Springer
    Transport in porous media 25 (1996), S. 313-334 
    Details
    ISSN: 1573-1634
    Keywords: unsaturated flow ; instabilities ; fingering ; linear stability analysis ; cutoff wavelength ; instability criterion ; nonlinearity ; spatial-temporal complexity ; exponential growth ; moisture profiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The stability of steady-state solutions to the unsaturated flow equation is examined. Conditions under which infinitesimal disturbances are amplified are determined by linear stability analysis. Uniform suction head profiles are shown to be linearly stable to three-dimensional disturbances. The stability of nonuniform suction head profiles to planar (gc 1 − χ 2) disturbances is examined. When the steady-state suction head solution (Ψ) increases with depth, χ3, (dΨ/dχ3 〉 0), a condition for the amplification of infinitesimal planar disturbances is identified as $$\frac{{d^2 K(\Psi )}}{{d\Psi ^2 }} 〉 \frac{{\left( {\frac{{dK(\Psi )}}{{d\Psi }}} \right)^2 }}{{K(\Psi )}},$$ , where K(Ψ) is the hydraulic conductivity versus suction head characteristic of the porous medium. The same condition applies when dΨ/dχ3 〈 -1. Therefore when the rate of change of the slope of the K - Ψ characteristic curves is larger than the squared slope divided by K, even small disturbances can be amplified exponentially. The smallest wavelength of unstable planar perturbations is shown to be inversely related to the coarseness of the soil. Conditions under which the instability criterion is met are delineated for some commonly employed K - Ψ curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140986
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  • 7
    Electronic Resource
    Electronic Resource
    Advection-diffusion in spatially random flows: Formulation of concentration covariance (1997)
    Springer
    Stochastic environmental research and risk assessment 11 (1997), S. 397-422 
    Details
    ISSN: 1436-3259
    Keywords: Random flow field ; diffusion ; concentration ; fluctuations ; covariance ; variance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The concentration c(x,t) of a nonreactive solute undergoing advection and diffusion in a spatially random divergence-free flow field is analyzed. A leading order formulation for the spatial covariance of the concentration field, $$\overline {c'\left( {x,t} \right)c'\left( {x,t} \right)} $$ , is made. That formulation includes the velocity variability induced macrodispersive flux of the covariance field, and the smoothing effects of diffusion. Previous formulations of the concentration covariance had dropped at least one of these effects. It is shown that both these effects need to be included to obtain a qualitatively correct description of the concentration fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02427926
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  • 8
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    Mixing and Bimolecular Reaction Kinetics in a Plane Poisseulle Flow (2011)
    Springer
    Details
    Publication Date: 2011-09-20
    Print ISSN: 1386-6184
    Electronic ISSN: 1573-1987
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
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    Criterion for instability of steady-state unsaturated flows (1996)
    Springer
    Details
    Publication Date: 1996-12-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 10
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    Dynamics of mixing and bimolecular reaction kinetics in aquifers (2012)
    Springer
    Details
    Publication Date: 2012-12-29
    Print ISSN: 1436-3240
    Electronic ISSN: 1436-3259
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Published by Springer
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