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Gupta, D.K. (author), van Keulen, A. (author), Langelaar, M. (author)
Multiresolution topology optimization (MTO) methods involve decoupling of the design and analysis discretizations, such that a high‐resolution design can be obtained at relatively low analysis costs. Recent studies have shown that the MTO method can be approximately 3 and 30 times faster than the traditional topology optimization method for 2D...
journal article 2019
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Knulst, A.J. (author), Gupta, Shailvi (author), Groen, Reinou S. (author), Maharjan, Dipak (author), Kapendra, Amatya S. (author), Dankelman, J. (author), Kushner, Adam L. (author)
Objectives: Lack of access to safe surgery is seen as a major issue that needs to be addressed. The aim of this study was to understand which combinations of factors relate to high occurrences of unmet needs and disability in Nepal, and consequently, how to focus future work to maximise impact in this country. Methods: A large population...
journal article 2019
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Vilhar, Gregor (author), Laera, Anita (author), Foria, Federico (author), Gupta, Abhishek (author), Brinkgreve, R.B.J. (author)
This paper presents the implementation, validation, and application of the PM4Sand model (version 3) formulated by Boulanger and Ziotopoulou (2015) in the PLAXIS finite element code. The model can be used for modelling geotechnical earthquake engineering applications, especially in the case liquefaction is likely to occur. The PM4Sand model...
journal article 2018
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Piscaer, P.J. (author), Gupta, A. (author), Soloviev, O.A. (author), Verhaegen, M.H.G. (author)
In this paper, we propose the use of Gaussian radial basis functions (GRBFs) to model the generalized pupil function for phase retrieval. The selection of the GRBF hyper-parameters is analyzed to achieve an increased accuracy of approximation. The performance of the GRBF-based method is compared in a simulation study with another modal-based...
journal article 2018
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Gupta, D.K. (author), Langelaar, M. (author), van Keulen, A. (author)
Recent multiresolution topology optimization (MTO) approaches involve dividing finite elements into several density cells (voxels), thereby allowing a finer design description compared to a traditional FE-mesh-based design field. However, such formulations can generate discontinuous intra-element material distributions resembling QR-patterns....
journal article 2018
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Gupta, D.K. (author), Barink, Marco (author), Langelaar, M. (author)
Concentrated photovoltaics (CPV) has recently gained popularity due to its ability to deliver significantly more power at relatively lower absorber material costs. In CPVs, lenses and mirrors are used to concentrate illumination over a small solar cell, thereby increasing the incident light by several folds. This leads to non-uniform...
journal article 2018
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Appalanaidu, Y. (author), Roy, A. (author), Gupta, S. (author)
A stochastic finite element-based methodology is developed for creep damage assessment in pipings carrying high-temperature fluids. The material properties are assumed to be spatially randomly inhomogeneous and are modelled as 3-D non-Gaussian fields. A spectral-based approach for random field discretization that preserves exactly the non...
journal article 2017
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Gupta, D.K. (author), van der Veen, G.J. (author), Aragon, A.M. (author), Langelaar, M. (author), van Keulen, A. (author)
Topology optimization formulations using multiple design variables per finite element have been proposed to improve the design resolution. This paper discusses the relation between the number of design variables per element and the order of the elements used for analysis. We derive that beyond a maximum number of design variables, certain sets...
journal article 2017
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Karewar, S.V. (author), Gupta, N. (author), Groh, S. (author), Martinez, E. (author), Caro, A. (author), Srinivasan, S.G. (author)
Addition of solutes such as lithium enhances ductility of hexagonal-close-packed (hcp) magnesium (Mg). However, the atomistic underpinning of Li addition on individual deformation mechanisms remain unclear and is the focus of the present work. We compared the deformation mechanisms in nanocrystalline (NC) and single crystal simulation systems...
journal article 2017
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Guan, Yaoyi (author), Pröbsting, S. (author), Stephens, David (author), Gupta, A. (author), Morris, Scott C. (author)
Trailing edge and wake flows are of interest for a wide range of applications. Small changes in the design of asymmetrically beveled or semi-rounded trailing edges can result in significant difference in flow features which are relevant for the aerodynamic performance, flow-induced structural vibration and aerodynamically generated sound. The...
journal article 2016
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Gupta, Ankur (author), Eral, H.B. (author), Hatton, T. Alan (author), Doyle, Patrick S. (author)
Nanoemulsions are kinetically stable liquid-in-liquid dispersions with droplet sizes on the order of 100 nm. Their small size leads to useful properties such as high surface area per unit volume, robust stability, optically transparent appearance, and tunable rheology. Nanoemulsions are finding application in diverse areas such as drug...
journal article 2016
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Gupta, D.K. (author), Langelaar, M. (author), Barink, M (author), van Keulen, A. (author)
Free-form solar cells are cells of unconventional shapes (e.g. hexagonal, leaf-shaped etc). Their flexible shape adds to the aesthetics of the surroundings as well as allows to place them over objects where conventional solar cells might not fit. Evidently, these cells need to be efficient as well, and one of the important factors that...
journal article 2016
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Gupta, D.K. (author), Barink, M (author), Galagan, Y (author), Langelaar, M. (author)
Free-form solar cells expand solar power beyond traditional rectangular geometries. With the flexibility of being installed on objects of daily use, they allow making better use of available space and are expected to bring in new possibilities of generating solar power in the coming future. In addition, their customizable shape can add to the...
journal article 2016
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Roy, P.N.S. (author), Gupta, D.K. (author)
Earthquakes are seismic phenomena caused by the sudden release of energy in the Earth’s crust. Their effects range from ground shaking to faulting. Geological and geophysical studies, especially in light of plate tectonic theory have been used to explain the occurrence of earthquakes. Thus from the point of view of statistical fractals,...
journal article 2015
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Edixhoven, J.D. (author), Gupta, J. (author), Savenije, H.H.G. (author)
Phosphate rock (PR) is a finite mineral indispensable for fertilizer production, while P (phosphorus) is a major pollutant if applied or discharged in excess, causing widespread eutrophication (Carpenter and Bennet, 2011). High-grade PR is obtained from deposits which took millions of years to form and which are gradually being depleted....
journal article 2014
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Gharari, S. (author), Shafiei, M. (author), Hrachowitz, M. (author), Kumar, R. (author), Fenicia, F. (author), Gupta, H.V. (author), Savenije, H.H.G. (author)
Many environmental systems models, such as conceptual rainfall-runoff models, rely on model calibration for parameter identification. For this, an observed output time series (such as runoff) is needed, but frequently not available (e.g., when making predictions in ungauged basins). In this study, we provide an alternative approach for parameter...
journal article 2014
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Ehret, U. (author), Gupta, H.V. (author), Sivapalan, M. (author), Weijs, S.V. (author), Schymanski, S.J. (author), Blöschl, G. (author), Gelfan, A.N. (author), Harman, C. (author), Kleidon, A. (author), Bogaard, T.A. (author), Wang, D. (author), Wagener, T. (author), Scherer, U. (author), Zehe, E. (author), Bierkens, M.F.P. (author), Di Baldassarre, G. (author), Parajka, J. (author), Van Beek, L.P.H. (author), Van Griensven, A. (author), Westhoff, M.C. (author), Winsemius, H.C. (author)
Throughout its historical development, hydrology as an earth science, but especially as a problem-centred engineering discipline has largely relied (quite successfully) on the assumption of stationarity. This includes assuming time invariance of boundary conditions such as climate, system configurations such as land use, topography and...
journal article 2014
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Wink, J. (author), Roos, B. (author), Gupta, S. (author)
The Jet Propulsion Laboratory (JPL) located in Pasadena, California is the leading organisation for planetary missions and a point of attraction for many Aerospace Engineers. The Leonardo Times interviewed a former student of our faculty who made the big leap overseas and dedicated his career to planetary exploration from JPL. We talk to him...
journal article 2013
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Gharari, S. (author), Shafiei, M. (author), Hrachowitz, M. (author), Fenicia, F. (author), Gupta, H.V. (author), Savenije, H.H.G. (author)
Many environmental systems models, such as conceptual rainfall-runoff models, rely on model calibration for parameter identification. For this, an observed output time series (such as runoff) is needed, but frequently not available. Here, we explore another way to constrain the parameter values of semi-distributed conceptual models, based on two...
journal article 2013
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Gupta, S. (author)
The global civil aviation industry is currently dominated by two major powers in the form of Boeing and Airbus. The market has been characterized as a duopoly. However, this status quo is by no means immutable. Over the coming decades, growing demand might lead to other companies making their mark on the global aviation market. High time to look...
journal article 2013
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