• Zindler-type hypersurfaces in R^4 

  Martinez-Maure, Y.; Rochera, D. (2022-09-08)

  In this paper the definition of Zindler-type hypersurfaces is introduced in $\mathbb{R}^4$ as a generalization of planar Zindler curves. After recalling some properties of planar Zindler curves, it is shown that Zindler ...

• The DPG Method for the Convection-Reaction Problem, Revisited 

  Demkowicz, L.; Roberts, N.V.; Muñoz-Matute, J. (2022-01-01)

  We study both conforming and non-conforming versions of the practical DPG method for the convection-reaction problem. We determine that the most common approach for DPG stability analysis - construction of a local Fortin ...

• Machining-induced characteristics of microstructure-supported LPBF-IN718 curved thin walls 

  Mishra, S.; Escudero, G.; Gonzalez, H.; Calleja, A.; Martinez, S.; Barton, M.; Lopez de Lacalle, N.; Mishra (2022-07)

  The microstructure-supported design of engineering components is recently gaining attention due to their high strength-to-weight and high stiffness-to-weight properties. The present study investigates the hybrid manufacturing ...

• 1D Painless Multi-level Automatic Goal-Oriented h and p Adaptive Strategies Using a Pseudo-Dual Operator 

  Caro, F.V.; Darrigrand, V.; Alvarez-Aramberri, J.; Alberdi, E.; Pardo, D. (2022-01-01)

  The main idea of our Goal-Oriented Adaptive (GOA) strategy is based on performing global and uniform h- or p-refinements (for h- and p-adaptivity, respectively) followed by a coarsening step, where some basis functions are ...

• Refined isogeometric analysis of quadratic eigenvalue problems 

  Hashemian, A.; Garcia, D.; Pardo, D.; Calo, V.M. (2022-07-16)

  Certain applications that analyze damping effects require the solution of quadratic eigenvalue problems (QEPs). We use refined isogeometric analysis (rIGA) to solve quadratic eigenproblems. rIGA discretization, while ...

• Offsets and front tire tracks to projective hedgehogs 

  Rochera, D. (2022-07-25)

  There are some known properties on curves of constant width and Zindler curves and their relationship with offsets and front tire-track curves in convex geometry. In this work, a generalization of all these concepts and ...

• Combined model-based and machine learning approach for damage identification in bridge type structures 

  Fernandez-Navamuel, A.; Zamora-Sánchez, D.; Armijo-Prieto, A.; Varona-Poncela, T.; García-Sánchez, D.; García-Villena, F.; Ruiz-Cuenca, F. (2022-06)

  In this work, we propose a combined approach of model-based and machine learning techniques for damage identification in bridge structures. First, a finite element model is calibrated with real data from experimental ...

• Regular polygons on isochordal-viewed hedgehogs 

  Rochera, D. (2022)

  A curve $\alpha$ is called isochordal viewed if there is a smooth motion of a constant length chord with its endpoints along $\alpha$ such that their tangents to the curve at these points form a constant angle. In this ...

• An implicit symplectic solver for high-precision long term integrations of the Solar System 

  Antoñana, M.; Alberdi, E.; Makazaga, J.; Murua, A. (2022)

  We present FCIRK16, a 16th-order implicit symplectic integrator for long-term high precision Solar System simulations. Our integrator takes advantage of the near-Keplerian motion of the planets around the Sun by ...

• Efficient 5-axis CNC trochoidal flank milling of 3D cavities using custom-shaped cutting tools 

  Bo, P.; Fan, H.; Barton, M. (2022-05)

  A novel method for trochoidal flank milling of 3D cavities bounded by free-form surfaces is proposed. Existing 3D trochoidal milling methods use on-market milling tools whose shape is typically cylindrical or conical, and ...

• Nonhyperbolic normal moveout stretch correction with deep learning automation 

  Abedi, M.M.; Pardo, D. (2022-02-15)

  Normal-moveout (NMO) correction is a fundamental step in seismic data processing. It consists of mapping seismic data from recorded traveltimes to corresponding zero-offset times. This process produces wavelet stretching ...

• Exploiting the Kronecker product structure of φ−functions in exponential integrators 

  Muñoz-Matute, J.; Pardo, D.; Calo, Victor M. (2022-05-15)

  Exponential time integrators are well-established discretization methods for time semilinear systems of ordinary differential equations. These methods use (Formula presented.) functions, which are matrix functions related ...

• Supervised Deep Learning with Finite Element simulations for damage identification in bridges 

  Fernandez-Navamuel, A.; Zamora-Sánchez, Diego; Omella, Ángel J.; Pardo, D.; Garcia-Sanchez, David; Magalhães, Filipe (2022-04-15)

  This work proposes a supervised Deep Learning approach for damage identification in bridge structures. We employ a hybrid methodology that incorporates Finite Element simulations to enrich the training phase of a Deep ...

• Algebraic equations for constant width curves and Zindler curves 

  Rochera, D. (2022-03)

  An explicit method to compute algebraic equations of curves of constant width and Zindler curves generated by a family of middle hedgehogs is given thanks to a property of Chebyshev polynomials. This extends the methodology ...

• Curve-guided 5-axis CNC flank milling of free-form surfaces using custom-shaped tools 

  Rajain, K.; Sliusarenko, O.; Bizzarri, M.; Barton, M. (2022-03)

  A new method for 5-axis flank milling of free-form surfaces is proposed. Existing flank milling path-planning methods typically use on-market milling tools whose shape is cylindrical or conical, and is therefore not ...

• 2.5-D Deep Learning Inversion of LWD and Deep-Sensing em Measurements Across Formations with Dipping Faults 

  Noh, Kyubo; Pardo, D.; Torres-Verdin, Carlos (2022-01-01)

  Deep learning (DL) inversion of induction logging measurements is used in well geosteering for real-time imaging of the distribution of subsurface electrical conductivity. We develop a DL inversion workflow to solve 2.5-D ...

• On quadrature rules for solving Partial Differential Equations using Neural Networks 

  Rivera, J.A; Taylor, J.M.; Omella, Ángel J.; Pardo, D. (2022-04-01)

  Neural Networks have been widely used to solve Partial Differential Equations. These methods require to approximate definite integrals using quadrature rules. Here, we illustrate via 1D numerical examples the quadrature ...

• Uncertainty Quantification on the Inversion of Geosteering Measurements using Deep Learning 

  Rivera, J.A; Shahriari, M; Pardo, D.; Omella, J.; Torres-Verdín, C. (2021-11-01)

  We propose the use of a Deep Learning (DL) algorithm for the real-time inversion of electromagnetic measurements acquired during geosteering operations. Moreover, we show that when the DL algorithm is equipped with a ...

• On numerical solution of Fredholm and Hammerstein integral equations via Nystr\"{o}m method and Gaussian quadrature rules for splines 

  Barrera, D.; Barton, M.; Chiarella, A.; Remogna, S. (2022-01)

  Nystr\"{o}m method is a standard numerical technique to solve Fredholm integral equations of the second kind where the integration of the kernel is approximated using a quadrature formula. Traditionally, the quadrature ...

• Deep learning enhanced principal component analysis for structural health monitoring 

  Fernandez-Navamuel, A.; Magalhães, Filipe; Zamora-Sánchez, Diego; Omella, Ángel J.; Garcia-Sanchez, David; Pardo, D. (2022-01-01)

  This paper proposes a Deep Learning Enhanced Principal Component Analysis (PCA) approach for outlier detection to assess the structural condition of bridges. We employ partially explainable autoencoder architecture to ...

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