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Kumar, Shashi (author), Babu, Arun (author), Agrawal, Shefali (author), Asopa, U. (author), Shukla, S. (author), Maiti, Abhisek (author)The Polarimetric Synthetic Aperture Radar (PolSAR) systems use electromagnetic radiations of different polarizations in the microwave frequency to collect the scattering information from targets on the Earth. Nevertheless, as with any other electronic device, the PolSAR systems are also not ideal and subjected to distortions. The most...journal article 2022
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Vermunt, P.C. (author), Steele-Dunne, S.C. (author), Khabbazan, S. (author), Kumar, V. (author), Judge, Jasmeet (author)For a good interpretation of radar backscatter sensitivity to vegetation water dynamics, we need to know which parts of the vegetation layer control that backscatter. However, backscatter sensitivity to different depths in the canopy is poorly understood. This is partly caused by a lack of observational data to describe the vertical moisture...journal article 2022
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Hille, Helge C. (author), Kumar, Siddhant (author), De Lorenzis, Laura (author)We propose Floating Isogeometric Analysis (FLIGA), which extends IGA to extreme deformation analysis. The method is based on a novel tensor-product construction of B-Splines for the update of the basis functions in one direction of the parametric space. With basis functions “floating” deformation-dependently in this direction, mesh distortion...journal article 2022
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Alfarih, Mashael (author), Augusto, João B. (author), Knott, Kristopher D. (author), Fatih, Nasri (author), Kumar, M. Praveen (author), Boubertakh, Redha (author), Hughes, Alun D. (author), Moon, James C. (author), Weingärtner, S.D. (author), Captur, Gabriella (author)Background: To assess the feasibility of biventricular SAPPHIRE T<sub>1</sub> mapping in vivo across field strengths using diastolic, systolic and dark-blood (DB) approaches. Methods: 10 healthy volunteers underwent same-day non-contrast cardiovascular magnetic resonance at 1.5 Tesla (T) and 3 T. Left and right ventricular (LV, RV) T<sub>1<...journal article 2022
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Poudel, Prakash (author), Sharma, S. (author), Ansari, Mohamed Nainar Mohamed (author), Kumar, Pushpendra (author), Ibrahim, Sobhy M. (author), Vaish, Rahul (author), Kumar, Rajeev (author), Thomas, Paramanandam (author)In this study, a method for the bacterial disinfection of drinking water in the water storage systems based on the electric potential generated from a piezoelectric wind energy harvester is presented. First, an efficient galloping piezoelectric wind energy harvester is designed by adding curve- shaped attachments to the bluff body of the...journal article 2022
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Marques Pereira, V. (author), Davis, T. P. (author), Mayoral, M. H. (author), Kumar, A. (author), Schut, H. (author), Sietsma, J. (author)Oxide Dispersion Strengthened (ODS) steels are potential candidate materials for application as structural components of fission and fusion reactors, known for their high thermal stability, high resistance to creep and to radiation-induced damage. These attractive properties result from the presence of the fine and highly thermally stable...journal article 2022
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Flaschel, Moritz (author), Kumar, Siddhant (author), De Lorenzis, Laura (author)We propose an approach for data-driven automated discovery of material laws, which we call EUCLID (Efficient Unsupervised Constitutive Law Identification and Discovery), and we apply it here to the discovery of plasticity models, including arbitrarily shaped yield surfaces and isotropic and/or kinematic hardening laws. The approach is...journal article 2022
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Lips, Esther H. (author), Kumar, Tapsi (author), Megalios, Anargyros (author), Visser, Lindy L. (author), Sheinman, Michael (author), Fortunato, Angelo (author), Shah, Vandna (author), Hoogstraat, Marlous (author), Wessels, L.F.A. (author)Ductal carcinoma in situ (DCIS) is the most common form of preinvasive breast cancer and, despite treatment, a small fraction (5–10%) of DCIS patients develop subsequent invasive disease. A fundamental biologic question is whether the invasive disease arises from tumor cells in the initial DCIS or represents new unrelated disease. To address...journal article 2022
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Voss, Jendrik (author), Martin, R.P. (author), Sander, Oliver (author), Kumar, Siddhant (author), Kochmann, Dennis M. (author), Neff, Patrizio (author)Deciding whether a given function is quasiconvex is generally a difficult task. Here, we discuss a number of numerical approaches that can be used in the search for a counterexample to the quasiconvexity of a given function W. We will demonstrate these methods using the planar isotropic rank-one convex function Wmagic+(F)=λmaxλmin-logλmaxλmin...journal article 2022
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Li, Meng (author), Chen, Yifei (author), Kumar, Neeraj (author), Lal, C. (author), Conti, M. (author), Alazab, Mamoun (author)Current connected and autonomous vehicles will contribute to various and green vehicular services. However, sharing personal data with untrustworthy Navigation Service Providers (NSPs) raises serious location concerns. To address this issue, many Location Privacy-Preserving Mechanisms (LPPMs) have been proposed. In addition, several...journal article 2022
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Singh, Diwakar (author), Sharma, S. (author), Kumar, Rajeev (author), Vaish, Rahul (author)A model for numerical homogenization of triply periodic minimal surfaces (TPMS) based on electrostrictive composites is presented. This electrostrictive composite consists of TPMS (a three-dimensional continuous structure) implanted in a soft non-electrostrictive matrix. A representative volume element (RVE)-based approach is used to...journal article 2022
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Ledoux, H. (author), Biljecki, Filip (author), Dukai, B. (author), Kumar, Kavisha (author), Peters, R.Y. (author), Stoter, J.E. (author), Commandeur, T.J.F. (author)Three-dimensional city models are essential to assess the impact that environmental factors will have on citizens, because they are the input to several simulation and prediction software. Examples of such environmental factors are noise (Stoter et al., 2008), wind (Garcı́a-Sánchez et al., 2014), air pollution (Ujang et al., 2013), and...journal article 2021
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Flaschel, Moritz (author), Kumar, Siddhant (author), De Lorenzis, Laura (author)We propose a new approach for data-driven automated discovery of isotropic hyperelastic constitutive laws. The approach is unsupervised, i.e., it requires no stress data but only displacement and global force data, which are realistically available through mechanical testing and digital image correlation techniques; it delivers interpretable...journal article 2021
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Zheng, Li (author), Kumar, Siddhant (author), Kochmann, Dennis M. (author)We present a two-scale topology optimization framework for the design of macroscopic bodies with an optimized elastic response, which is achieved by means of a spatially-variant cellular architecture on the microscale. The chosen spinodoid topology for the cellular network on the microscale (which is inspired by natural microstructures...journal article 2021
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Hosseini, Mehdi (author), McNairn, Heather (author), Mitchell, Scott (author), Robertson, Laura Dingle (author), Davidson, Andrew (author), Ahmadian, Nima (author), Bhattacharya, Avik (author), Borg, Erik (author), Kumar, V. (author)The water cloud model (WCM) can be inverted to estimate leaf area index (LAI) using the intensity of backscatter from synthetic aperture radar (SAR) sensors. Published studies have demonstrated that the WCM can accurately estimate LAI if the model is effectively calibrated. However, calibration of this model requires access to field measures...journal article 2021
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Wei, L. (author), Grénman, Henrik (author), Haije, W.G. (author), Kumar, Narendra (author), Aho, Atte (author), Eränen, Kari (author), Wei, L. (author), de Jong, W. (author)Sub-nanometer zeolite 13X-supported Ni-ceria catalysts were synthesized for CO<sub>2</sub> methanation. XRD and SEM results show the structure and morphology of 13X zeolite after impregnation and calcination. Ce loading affected the catalysts’ metal dispersion, reducibility, basicity and acidity, and thence their activity and selectivity....journal article 2021
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Kumar, Arun (author), Ali, Mohammad (author), Kumar, Ranjit (author), Kumar, Mukesh (author), Sagar, Prity (author), Rani, Rita (author), Kumar, S. (author), Kumar, Dhruv (author), Ghosh, Ashok Kumar (author)Reportedly, 300 million people worldwide are affected by the consumption of arsenic contaminated groundwater. India prominently figures amongst them and the state of Bihar has shown an upsurge in cases affected by arsenic poisoning. Escalated arsenic content in blood, leaves 1 in every 100 human being highly vulnerable to being affected by...journal article 2021
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Haque, Mohammad T. (author), Will, Marco (author), Tomi, Matti (author), Pandey, Preeti (author), Kumar, Manohar (author), Schmidt, F.E. (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), Steele, G.A. (author)We have studied 1/f noise in critical current I<sub>c</sub> in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to ≃ 5 nA. The low frequency noise in the superconducting state is measured by tracking the variation in...journal article 2021
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Beran, Daniel (author), Jedlička, Karel (author), Kumar, Kavisha (author), Popelka, Stanislav (author), Stoter, J.E. (author)3D cartographic visualization of a continuous time-dependent phenomenon is not an easy task. The focus of this research is motivated by the struggle to visualize such a phenomenon. Based on the current state of the art, we implemented new visualization methods to visualize continuous time-dependent phenomena. All visualizations are based on...journal article 2021
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Fu, J. (author), Davis, T. P. (author), Kumar, A. (author), Richardson, I.M. (author), Hermans, M.J.M. (author)Oxide dispersion strengthened (ODS) steels are leading candidates for structural materials in nuclear fission and fusion power plants. Understanding the nature of nano-oxide particles in ODS steels is vital for a better control of the microstructure and mechanical properties to further their applications. In this study, electron microscopy...journal article 2021