document

Rapid simulation of permanent magnet drives

Kumar, P. (author), van Duijsen, P. (author), Bauer, P. (author)

conference paper 2007

document

Optimization technique for ED&PE

Kumar, P. (author), Bauer, P. (author)

conference paper 2007

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Multi-objective optimization of a BLDC drive

Kumar, P. (author), Bauer, P. (author)

conference paper 2007

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A framework for multi-objective optimization and multi-criteria decision making for design of electrical drives

Kumar, P. (author)

doctoral thesis 2008

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Phosphate recovery from wastewater via reversible adsorption

Suresh Kumar, P. (author)

Eutrophication and the resulting formation of harmful algal blooms causes huge economic and environmental damages. Phosphorus (P) has been identified as a major limiting nutrient for eutrophication. Phosphorous concentration greater than 100 µg P/L is usually considered high enough for causing eutrophication. The strictest regulations however...

doctoral thesis 2018

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Multilevel Solvers for Stochastic Fluid Flows

Kumar, P. (author)

Uncertainty is ubiquitous in many areas of science and engineering. It may result from the inadequacy of mathematical models to represent the reality or from unknown physical parameters that are required as inputs for these models. Uncertainty may also arise due to the inherent randomness of the system being analyzed. For many problems of...

doctoral thesis 2019

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Engineered nanomaterials: Knowledge gaps in fate, exposure, toxicity, and future directions

Kumar, A. (author), Kumar, P. (author), Anandan, A. (author), Fernandes, T.F. (author), Ayoko, G.A. (author), Biskos, G. (author)

The aim of this study is to identify current knowledge gaps in fate, exposure, and toxicity of engineered nanomaterials (ENMs), highlight research gaps, and suggest future research directions. Humans and other living organisms are exposed to ENMs during production or use of products containing them. To assess the hazards of ENMs, it is important...

journal article 2014

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Climate, soil, and vegetation controls on the temporal variability of vadose zone transport

Harman, C.J. (author), Rao, P.S.C. (author), Basu, N.B. (author), McGrath, G.S. (author), Kumar, P. (author), Sivapalan, M. (author)

Temporal patterns of solute transport and transformation through the vadose zone are driven by the stochastic variability of water fluxes. This is determined by the hydrologic filtering of precipitation variability into infiltration, storage, drainage, and evapotranspiration. In this work we develop a framework for examining the role of the...

journal article 2011

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Calculation of the Doppler broadening of the electron-positron annihilation radiation in defect-free bulk materials

Ghosh, V.J. (author), Alatalo, M. (author), Asoka-Kumar, P. (author), Nielsen, B. (author), Lynn, K.G. (author), Kruseman, A.C. (author), Mijnarends, P.E. (author)

journal article 2000

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Improved Analytical Model of a Permanent-Magnet Brushless DC Motor

Kumar, P. (author), Bauer, P. (author)

In this paper, we develop a comprehensive model of a permanent-magnet brushless DC (BLDC) motor. An analytical model for determining instantaneous air-gap field density is developed. This instantaneous field distribution can be further used to determine the cogging torque, induced back electromotive force, and iron losses in the motor. The...

journal article 2008

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Progressive design methodology for complex engineering systems based on multiobjective genetic algorithms and linguistic decision making

Kumar, P. (author), Bauer, P. (author)

This work focuses on a design methodology that aids in design and development of complex engineering systems. This design methodology consists of simulation, optimization and decision making. Within this work a framework is presented in which modelling, multi-objective optimization and multi criteria decision making techniques are used to design...

journal article 2008

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Improved genetic algorithm inspired by biological evolution

Kumar, P. (author), Gospodaric, D. (author), Bauer, P. (author)

journal article 2007

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The future of hydrology: An evolving science for a changing world

Wagener, T. (author), Sivapalan, M. (author), Troch, P.A. (author), McGlynn, B.L. (author), Harman, C.J. (author), Gupta, H.V. (author), Kumar, P. (author), Rao, P.S.C. (author), Basu, N.B. (author), Wilson, J.S. (author)

Human activities exert global-scale impacts on our environment with significant implications for freshwater-driven services and hazards for humans and nature. Our approach to the science of hydrology needs to significantly change so that we can understand and predict these implications. Such an adjustment is a necessary prerequisite for the...

journal article 2010

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Increased elemental specificity of positron annihilation spectra

Asoka-Kumar, P. (author), Alatalo, M. (author), Ghosh, V.J. (author), Kruseman, A.C. (author), Nielsen, B. (author), Lynn, K.G. (author)

journal article 1996

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Nanoparticle emissions from traditional pottery manufacturing

Voliotis, A. (author), Bezantakos, S. (author), Giamarelou, M. (author), Valenti, M. (author), Kumar, P. (author), Biskos, G. (author)

Traditional pottery manufacturing involves firing of the ceramics in kilns, a process that leads to high concentrations of airborne particles that are harmful to human health. In order to assess the associated exposure levels and the involved risks, here, for the first time, we investigate the size, the concentration and the elemental...

journal article 2014

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On topology optimization of design-dependent pressure-loaded three-dimensional structures and compliant mechanisms: + Erratum

Kumar, P. (author), Langelaar, Matthijs (author)

This article presents a density-based topology optimization method for designing three-dimensional (3D) compliant mechanisms (CMs) and loadbearing structures with design-dependent pressure loading. Instead of interface-tracking techniques, the Darcy law in conjunction with a drainage term is employed to obtain pressure field as a function of...

journal article 2021

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A multigrid multilevel Monte Carlo method for transport in the Darcy–Stokes system

Kumar, P. (author), Luo, P. (author), Gaspar, Francisco J. (author), Oosterlee, C.W. (author)

A multilevel Monte Carlo (MLMC) method for Uncertainty Quantification (UQ) of advection-dominated contaminant transport in a coupled Darcy–Stokes flow system is described. In particular, we focus on high-dimensional epistemic uncertainty due to an unknown permeability field in the Darcy domain that is modelled as a lognormal random field....

journal article 2018

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Effect of pore size distribution on iron oxide coated granular activated carbons for phosphate adsorption – Importance of mesopores

Suresh Kumar, P. (author), Prot, T.J.F. (author), Korving, Leon (author), Keesman, Karel J. (author), Dugulan, A.I. (author), van Loosdrecht, Mark C.M. (author), Witkamp, G.J. (author)

Adsorption is often suggested for to reach very low phosphate levels in municipal wastewater effluent and even to recover phosphate. Adsorbent performance is usually associated with surface area but the exact role of the pore size distribution (PSD) is unclear. Here, we show the effect of the PSD on phosphate adsorption. Granular activated...

journal article 2017

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A parametric acceleration of multilevel Monte Carlo convergence for nonlinear variably saturated flow

Kumar, P. (author), Rodrigo, Carmen (author), Gaspar, Francisco J. (author), Oosterlee, C.W. (author)

We present a multilevel Monte Carlo (MLMC) method for the uncertainty quantification of variably saturated porous media flow that is modeled using the Richards equation. We propose a stochastic extension for the empirical models that are typically employed to close the Richards equations. This is achieved by treating the soil parameters in...

journal article 2019

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Topology optimization of fluidic pressure-loaded structures and compliant mechanisms using the Darcy method

Kumar, P. (author), Frouws, Jan (author), Langelaar, Matthijs (author)

In various applications, design problems involving structures and compliant mechanisms experience fluidic pressure loads. During topology optimization of such design problems, these loads adapt their direction and location with the evolution of the design, which poses various challenges. A new density-based topology optimization approach...

journal article 2020