no code implementations • 10 Dec 2022 • Wai Shing Tang, David Silva-Sánchez, Julian Giraldo-Barreto, Bob Carpenter, Sonya Hanson, Alex H. Barnett, Erik H. Thiede, Pilar Cossio
Cryo-electron microscopy (cryo-EM) has recently become a premier method for obtaining high-resolution structures of biological macromolecules.
1 code implementation • 3 Feb 2021 • Julian Giraldo-Barreto, Sebastian Ortiz, Erik H. Thiede, Karen Palacio-Rodriguez, Bob Carpenter, Alex H. Barnett, Pilar Cossio
Cryo-electron microscopy (cryo-EM) extracts single-particle density projections of individual biomolecules.
1 code implementation • 22 Oct 2019 • Ludvig af Klinteberg, Alex H. Barnett
The method of Helsing and co-workers evaluates Laplace and related layer potentials generated by a panel (composite) quadrature on a curve, efficiently and with high-order accuracy for arbitrarily close targets.
Numerical Analysis Numerical Analysis
4 code implementations • 21 Aug 2018 • Alex H. Barnett, Jeremy F. Magland, Ludvig af Klinteberg
The nonuniform fast Fourier transform (NUFFT) generalizes the FFT to off-grid data.
Numerical Analysis Mathematical Software Numerical Analysis 65T50, 65T40, 65Y05, 68N01
2 code implementations • 24 Nov 2016 • Alex H. Barnett, Gary Marple, Shravan Veerapaneni, Lin Zhao
We present a spectrally-accurate scheme to turn a boundary integral formulation for an elliptic PDE on a single unit cell geometry into one for the fully periodic problem.
Numerical Analysis 65N38, 65N80, 76D07, 76M50
no code implementations • 27 Aug 2015 • Alex H. Barnett, Jeremy F. Magland, Leslie F. Greengard
We describe a suite of validation metrics that assess the credibility of a given automatic spike sorting algorithm applied to a given electrophysiological recording, when ground-truth is unavailable.