Now showing items 1-8 of 8

  • A recursive approach to multiscalar data interpolation of sparsely sampled sea surface measurements at different spatial resolutions 

    Reig Bolano, Ramon; Garcia Ladona, E.; Parisi Baradad, Vicenç; Marti Puig, Pere (2008)
    Conference report
    Restricted access - publisher's policy
    In many oceanographic studies there is a need to reconstruct a signal from a set of sparse measurements. We propose an algorithm to iteratively approximate the intermediate values between irregularly sampled data, when ...
  • Efficient Computation of Sparse Matrix Functions for Large-Scale Electronic Structure Calculations: The CheSS Library 

    Mohr, Stephan; Dawson, William; Wagner, Michael; Caliste, Damien; Nakajima, Takahito; Genovese, Luigi (American Chemical Society, 2017-09-05)
    Article
    Open Access
    We present CheSS, the “Chebyshev Sparse Solvers” library, which has been designed to solve typical problems arising in large-scale electronic structure calculations using localized basis sets. The library is based on a ...
  • Frequency extrapolation of IE-MEI linear system Coefficients in 2D 

    Rius Casals, Juan Manuel; Heldring, Alexander; Úbeda Farré, Eduard (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Restricted access - publisher's policy
    The Integral Equation MEI (IE-MEI) method for the sparsification of Method of Moments linear system matrix is revisited here. It achieves cpu computation time and storage memory requirements of order O(N ) (for 2D perfectly ...
  • Further insight into the measured equation of invariance EM theory 

    Mei, K.K.; Pous Andrés, Rafael; Prouty, M.D.; Liu, Y.W. (. IEEE AP-S SYMPOSIUM DIGEST, 1990)
    Conference report
    Open Access
    The measured equation of invariance (MEI) is a concept in field computation which leads to the generation of local linear equations in lieu of absorption conditions to terminate finite difference or finite element equations. ...
  • Integral formulation of the measured equation of invariance 

    Rius Casals, Juan Manuel (Institution of Electrical Engineers, 1996-01)
    Article
    Open Access
    A novel integral formulation of the measured equation of invariance is derived from the reciprocity theorem. This formulation leads to a sparse matrix equation for the induced surface current, resulting in great CPU time ...
  • Sparse unifrac algorithm for the study of microbial beta diversity 

    Ansuategui Vicente, Juan (Universitat Politècnica de Catalunya, 2012)
    Bachelor thesis
    Restricted access - confidentiality agreement
  • The measured equation of invariance and its application to transmission line modelling 

    Pous Andrés, Rafael; Prouty, M.D.; Mei, K.K. (. WORSHOP PROCEEDINGS, 1993)
    Conference report
    Open Access
    The Measured Equation of Invariance (MEI) is a geometry-dependent Finite Difference equation that can be used to terminate a mesh extremely close to the object of interest. The mesh can be terminated much closer than what ...
  • The theoretical error in the integral equation mei 

    Rius Casals, Juan Manuel; Carpintero, C Pérez; Cardama Aznar, Ángel; Mosig, J R (Institution of Electrical Engineers, 1996-11)
    Article
    Open Access
    The theoretical, or non-numerical error in the integral equation MEI (IE-MEI) is analysed and compared to the numerical error in the method of moments (MoM). It is found that, although this error does not decrease with the ...