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Kumar, A. (author), Saxena, A. K. (author), Kirchlechner, C. (author), Herbig, M. (author), Brinkmann, S. (author), Petrov, R.H. (author), Sietsma, J. (author)Failure in engineering materials like steels is strongly affected by in-service deleterious alterations in their microstructure. White Etching Layers (WELs) are an example of such in-service alterations in the pearlitic microstructure at the rail surface. Cracks initiate in the rails due to delamination and fracture of these layers and...journal article 2019
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Hajizad, O. (author), Kumar, A. (author), Li, Z. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author)Wheel–rail contact creates high stresses in both rails and wheels, which can lead to different damage, such as plastic deformation, wear and rolling contact fatigue (RCF). It is important to use high-quality steels that are resistant to these damages. Mechanical properties and failure of steels are determined by various microstructural...journal article 2019
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Liu, Z. (author), Ghatkesar, M.K. (author), Sudhölter, Ernst J. R. (author), Singh, Binder (author), Kumar, N. (author)Surfactants have the ability to mobilize residual oil trapped in pore spaces of matrix rocks by lowering the oil-water interfacial tension, resulting in a higher oil recovery. However, the loss of surfactants by adsorption onto the rock surface has become a major concern that reduces the efficiency of the surfactant flooding process. In this...journal article 2019
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Haaring, Robert (author), Kumar, N. (author), Bosma, D. (author), Poltorak, L. (author), Sudhölter, Ernst J. R. (author)The ability to study the adsorption behavior of surfactant species is of interest in the field of enhanced oil recovery (EOR), especially pertaining to alkaline surfactant flooding. In this work, a calcite model mineral surface was obtained by electrochemically assisted deposition. This was achieved via the nitrate and/or oxygen...journal article 2019
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Kumar, Kavisha (author), Labetski, A. (author), Ledoux, H. (author), Stoter, J.E. (author)The Level of Detail (LOD) concept in CityGML 2.0 is meant to differentiate the multiple representations of semantic 3D city models. Despite the popularity and general acceptance of the concept by the practitioners and stakeholders in 3D city modelling, there are still some limitations. While the CityGML LOD concept is well defined for buildings,...journal article 2019
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Kumar, Kavisha (author), Labetski, A. (author), Agugiaro, G. (author), Stoter, J.E. (author)GIS has become an important part of many disciplines and supports a vast range of applications. It is used everywhere, from agriculture to public health care. Furthermore, with the advances in technologies, the availability of GIS data and software support has grown exponentially. In this paper, we present the results of our international survey...journal article 2019
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Labetski, A. (author), Kumar, Kavisha (author), Ledoux, H. (author), Stoter, J.E. (author)While there exist international standards for geospatial metadata (ISO 19115), these are rarely used in practice for 3D datasets, and one of the OGC standards for 3D city models, CityGML, does not offer a mechanism to store metadata in a structured way. Having metadata in CityGML files, which are in practice often very large and complex, would...journal article 2018
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- Kumar, M. (author) doctoral thesis 2018
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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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Kumar, Naveen (author)A large part of the global population is still living without the access to electricity. The interconnected solar home system (SHS) has been purposed as a solution to meet the local demand in the remote areas. In this thesis, a decentralized architecture of SHS is considered which consists of four converters. This work proposed the design of one...master thesis 2018
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Kumar, Kavisha (author), Ledoux, H. (author), Stoter, J.E. (author)In this paper, we review state of the art 3D visualization technologies for floods and we focus on the Netherlands since it has a long history of dealing with floods and developing information technology solutions to prevent and predict them. We discuss the most recent advances in using 3D city models for modelling floods and discuss future...conference paper 2018
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Kumar, Jaya (author)In recent years, personalized recommender systems have been facing criticism in research due to their ability to trap users in their circle of choices, called "filter-bubble", thereby limiting their exposure to novel content. In solving the issue of filter-bubble, past research has focused on providing explanations to users about how a...master thesis 2018
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Sharifi Dehsari, Hamed (author), Kumar, Manasvi (author), Ghittorelli, Matteo (author), Glasser, Gunnar (author), Lenz, Thomas (author), de Leeuw, D.M. (author), Torricelli, Fabrizio (author), Asadi, Kamal (author)Solution-processed memory diodes based on phase separated blends of ferroelectric and semiconducting polymers in the low resistance on-state operate similar to a vertical field-effect transistor at the pinch-off. Numerical simulations have shown that the performance of the diode is dominated by the conduction of charge carriers at the...journal article 2018
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Kelly, Elizabeth A. (author), Feng, Zhixuan (author), Gidley, Maribeth L. (author), Sinigalliano, Christopher D. (author), Kumar, Naresh (author), Donahue, Allison G. (author), Reniers, A.J.H.M. (author), Solo-Gabriele, Helena M. (author)When beach water monitoring programs identify poor water quality, the causes are frequently unknown. We hypothesize that management policies play an important role in the frequency of fecal indicator bacteria (FIB) exceedances (enterococci and fecal coliform) at recreational beaches. To test this hypothesis we implemented an innovative...journal article 2018
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Kumar, Ankit (author)Noise generated due to flow over corrugated pipes has extensively been studied, because of its presence in various engineering applications. Flexible risers used in the oil and gas industry are one of these applications, where noise is produced due to corrugations present at the innermost layer of the riser. Dry-gas flow through a corrugated...master thesis 2018
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Kumar, Aditya (author)The environment in which microscopic organisms live in is dominated by viscous forces because of their small length scales. Inertial forces are of little use to them in their propulsion mechanisms. As a consequence of this, an organism such as the scallop which moves through time-reversible deformations of its body would not propel itself in a...master thesis 2018
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Kumar, Abhishek (author)Emulsions and foams are commonly found in products made by industries ranging from those<br/>associated with food and pharmaceuticals to those involved in selling personal care products.<br/>This work is motivated by the need for accurate models of their mechanics, which can then be<br/>used for efficient processing.<br/><br/>They can be thought...master thesis 2018
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Biljecki, F. (author), Kumar, Kavisha (author), Nagel, Claus (author)The Application Domain Extension (ADE) is a built-in mechanism of CityGML to augment its data model with additional concepts required by particular use cases. The goal of this paper is to provide an overview of the ADE mechanism and a literature review of developments since its introduction a decade ago. The discovery of publications found that...journal article 2018
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Kumar, V. (author), Savenije, F.J. (author), van Wingerden, J.W. (author)Increasing demands in decentralized power plants have focused attention on Vertical Axis Wind Turbines (VAWTs). However, accessing high range of power from VAWTs is an impediment due to increased loads on the turbine blades. Here, we derive an optimal pitching action that reduces the periodic disturbance on turbine blades of VAWTs without...conference paper 2018
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Kumar, Sachin (author), Wang, Yihe (author), Poh, Leong Hien (author), Chen, B. Y. (author)The Floating Node Method (FNM), first developed for modeling the fracture behavior of laminate composites, is here combined with a domain-based interaction integral approach for the generic fracture modeling of quasi-brittle materials from crack nucleation, propagation to final failure. In this framework, FNM is used to represent the...journal article 2018