Search Results for author: Kaushik Bhattacharya

Found 10 papers, 6 papers with code

Learning Homogenization for Elliptic Operators

2 code implementations21 Jun 2023 Kaushik Bhattacharya, Nikola Kovachki, Aakila Rajan, Andrew M. Stuart, Margaret Trautner

However, a major challenge in data-driven learning approaches for this problem has remained unexplored: the impact of discontinuities and corner interfaces in the underlying material.

Neural Operator: Learning Maps Between Function Spaces

1 code implementation19 Aug 2021 Nikola Kovachki, Zongyi Li, Burigede Liu, Kamyar Azizzadenesheli, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

The classical development of neural networks has primarily focused on learning mappings between finite dimensional Euclidean spaces or finite sets.

Operator learning

Learning Dissipative Dynamics in Chaotic Systems

2 code implementations13 Jun 2021 Zongyi Li, Miguel Liu-Schiaffini, Nikola Kovachki, Burigede Liu, Kamyar Azizzadenesheli, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

Chaotic systems are notoriously challenging to predict because of their sensitivity to perturbations and errors due to time stepping.

Actuation of cylindrical nematic elastomer balloons

no code implementations23 Dec 2020 Victoria Lee, Kaushik Bhattacharya

Nematic elastomers are programmable soft materials that display large, reversible and predictable deformation under an external stimulus such as a change in temperature or light.

Soft Condensed Matter

Photochemical-induced phase transitions in photoactive semicrystalline polymers

no code implementations2 Dec 2020 Ruobing Bai, Eric Ocegueda, Kaushik Bhattacharya

We find that the photo-reaction rate depends sensitively on temperature: at temperatures below the crystal-melt transition temperature, photoreaction is collective, requires a critical light intensity and shows an abrupt first order phase transition manifesting nucleation and growth; at temperatures above the transition temperature, photoreaction is independent and follows first order kinetics.

Soft Condensed Matter Mesoscale and Nanoscale Physics

Collective behavior in the kinetics and equilibrium of solid-state photoreaction

no code implementations2 Nov 2020 Ruobing Bai, Ying Shi Teh, Kaushik Bhattacharya

There is current interest in developing photoactive materials that deform on illumination and can thus be used for photomechanical actuation.

Mesoscale and Nanoscale Physics Soft Condensed Matter Statistical Mechanics

Multipole Graph Neural Operator for Parametric Partial Differential Equations

4 code implementations NeurIPS 2020 Zongyi Li, Nikola Kovachki, Kamyar Azizzadenesheli, Burigede Liu, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

One of the main challenges in using deep learning-based methods for simulating physical systems and solving partial differential equations (PDEs) is formulating physics-based data in the desired structure for neural networks.

Model Reduction and Neural Networks for Parametric PDEs

no code implementations7 May 2020 Kaushik Bhattacharya, Bamdad Hosseini, Nikola B. Kovachki, Andrew M. Stuart

We develop a general framework for data-driven approximation of input-output maps between infinite-dimensional spaces.

Neural Operator: Graph Kernel Network for Partial Differential Equations

6 code implementations ICLR Workshop DeepDiffEq 2019 Zongyi Li, Nikola Kovachki, Kamyar Azizzadenesheli, Burigede Liu, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

The classical development of neural networks has been primarily for mappings between a finite-dimensional Euclidean space and a set of classes, or between two finite-dimensional Euclidean spaces.

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