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Ghosh, D. (author), Kumar, S. (author), Donselaar, M.E. (author), Corroto, C. (author), Ghosh, A.K. (author)The Ganges Delta is a key area where elemental contamination of groundwater constitutes a human catastrophe. The delta plain geomorphology comprises a large number of abandoned meander bends or oxbow lakes (Donselaar et al., 2017; Ghosh et al., 2021) characterized by an anoxic environment in the lower part of the lake water column (hypolimnion)....abstract 2021
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Wei, X. (author), Kumar, M. (author), Schuttelaars, H.M. (author)Along-channel and cross-channel sediment transport in tidal estuaries is usually driven by tides, density gradients, Coriolis’s force, wind stress, channel curvature and bathymetric variations. Since the water motion is influenced by density-induced gravitational circulation which in turn affects the salinity distribution, the coupled water...abstract 2016
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Kumar, A. (author), Blacquiere, G. (author)The subsurface image obtained from seismic data can be biased by the acquisition geometry: it contains an acquisition footprint, which can obstruct the subsurface characterization. So the acquisition geometry for a seismic experiment should be designed in such a way that it allows high-quality images and fulfills the criteria for the reservoir...book chapter 2011
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Mandal, Dipankar (author), Kumar, V. (author), Lopez-Sanchez, Juan M. (author), Rao, Y. S. (author), McNairn, Heather (author), Bhattacharya, Avik (author), Mitchell, Scott (author)Biophysical parameters are descriptors of crop growth and production estimates. Retrieval of these biophysical parameters from synthetic aperture radar sensors at operational scales is highly interesting given the increase in access to data from radar missions. Vegetation backscattering can be simulated using the water cloud model (WCM). Crop...book chapter 2022
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Arroyo Ohori, G.A.K. (author), Biljecki, F. (author), Kumar, Kavisha (author), Ledoux, H. (author), Stoter, J.E. (author)CityGML is the most important international standard used to model cities and landscapes in 3D with extensive semantics. Compared to BIM standards such as IFC, CityGML models are usually less detailed but they cover a much greater spatial extent. They are also available in any of five standardized levels of detail. CityGML serves as an exchange...book chapter 2018
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We construct a unified shell model for stably stratified and convective turbulence. Shell model simulation of stably stratified flow in turbulent regime exhibit Bolgiano-Obukhbov (BO) scaling in which the kinetic energy spectrum varies as $k^{-11/5}$. However, simulation of convective turbulence shows Kolmogorov's spectrum. These results are...conference paper 2015
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We study energy transfers during magnetic energy growth in small-scale and large-scale dynamos. We perform direct numerical simulations for magnetic Prandtl number Pm =20 and 0.2 in a periodic box on 1024^3 grid. Energy fluxes and shell-to-shell energy transfers indicate that in small-scale dynamo for Pm =20, the magnetic energy growth takes...conference paper 2015
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We perform renormalization group analysis (RG) of the Navier-Stokes equation in the presence of constant mean velocity field $\mathbf U_0$, and show that the renormalized viscosity is unaffected by $\mathbf U_0$, thus negating the ``sweeping effect", proposed by Kraichnan [Phys. Fluids {\bf 7}, 1723 (1964)] using random Galilean invariance....conference paper 2015
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Pereira, S.F. (author), Wiegman, A. (author), Kumar, N. (author), Da Costa Assafrao, A. (author), Polo, A. (author), Wei, L. (author), Van Haver, S. (author)Measurement techniques to determine the aberration of an optical system, by obtaining through-focus intensity images that are produced when the object is a point source at infinity, are shown. The analysis of the aberrations is made using the extended version of the Nijboer-Zernike diffraction theory. This theory provides a semi analytical...conference paper 2012
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- Kumar, P. (author), van Duijsen, P. (author), Bauer, P. (author) conference paper 2007
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Maity, Soumen (author), Phulwari, Pankaj (author), Rathi, Vaibhav (author), Chandran, Krishna (author), Sekhar, Achu (author), Kumar, Avinash (author), Banerjee, Abhijit (author)Ahmedabad is the largest city in the state of Gujarat and the 5th largest in India in terms of population. It is one of the most important economic and industrial hubs in India. Additionally it is one of the fastest growing cities in India, leading to large infrastructural projects including metro rail and river front. Construction is also...conference paper 2017
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- Petrik, P. (author), Fodor, B. (author), Agocs, E. (author), Kozma, P. (author), Nador, J. (author), Kumar, N. (author), Endres, J. (author), Juhasz, G. (author), Major, C. (author), Pereira, S.F. (author), Lohner, T. (author), Urbach, H.P. (author), Bodermann, B. (author), Fried, M. (author) conference paper 2015
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Kumar, A. (author), Blacquiere, G. (author), Pedersen, M.W. (author), Goertz, A. (author)Despite a tremendous leap in efficiency and wave field sampling over the last two decades, it is sometimes still difficult to achieve adequate coverage and resolution with marine streamer acquisition. It is therefore necessary to carefully study the acquisition geometry, especially with respect to resolution and image quality in the cross-line...conference paper 2015
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- Kumar, M. (author) conference paper 2008
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- Kumar, P. (author), Bauer, P. (author) conference paper 2007
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Kumar, A. (author), Blacquiere, G. (author), Verschuur, D.J. (author)Recent advances in survey design have led to conventional common-midpoint-based analysis being replaced by the subsurface-based seismic acquisition analysis and design, with the emphasis on advance techniques of illumination analysis. Amongst them are wave-equation-based seismic illumination analyses such as the so-called focal beam method. The...conference paper 2014
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Kumar, V.S. (author), Kumar, D. (author), Goyal, T. (author), Mohite, P.M. (author), Kamle, S. (author)Micro Air Vehicles (MAVs) are small unmanned aircrafts which have a maximum size limit of 150 mm in any direction. They can be used for surveillance, reconnaissance, targeting, etc. To perform such missions, MAVs are required to hover. Hummingbirds, having excellent flight characteristics (such as hovering, ability to fly in any direction,...conference paper 2014
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- Kumar, P. (author), Bauer, P. (author) conference paper 2007
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Kumar, D. (author), Sharma, A.R. (author), Goyal, T. (author), Shyam, V. (author), Mohite, P.M. (author), Kamle, S. (author)Flapping wing micro air vehicles (MAVs) have the advantage of being able to fly at slow speeds and have high maneuverability. The design of a flapping wing MAV inspired by birds presents many technical challenges because birds as natural fliers exhibit higher efficiency than any man made flapping wing structure. Thus, the structure and motion of...conference paper 2014
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Andreo, Guilherme Spinoza (author), Dardavesis, Ioannis (author), Jong, Michiel de (author), Kumar, Pratyush (author), Prihanggo, Maundri (author), Triantafyllou, Georgios (author), van der Vaart, C.G. (author), Verbree, E. (author)Indoor localisation methods are an essential part for the management of COVID-19 restrictions, social distancing, and the flow of people in the indoor environment. Moving towards an open work space in this scenario requires effective real-time localisation services and tools, along with a comprehensive understanding of the 3D indoor space. This...conference paper 2021