Ji Xia Job Title: Professor E-mail: jixia@bit.edu.cn
Professor. In 2001 and 2006, he graduated from the School of Mathematical Sciences of Peking University with bachelor's degree and Doctor's degree. From 2006 to 2008, he was a postdoctoral fellow at Charlotte University, North Carolina, USA, and worked at the Institute of Mathematics and Systems Sciences, Chinese Academy of Sciences and Beijing Institute of Technology. In recent years, the research work mainly focuses on the numerical solutions of partial differential equations. So far, he has published articles in the SIAM series, Journal of Computational Physics, ACM Transactions on Mathematical Software, More than 40 papers have been published in internationally renowned academic journals such as Inverse Problems.
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Numerical algorithms for eigenvalue problems.
Backscattering problem of incomplete data.
Machine learning.

September 2001 - July 2006
Doctor of Science Computational Mathematics and Applied Software Peking University School of Mathematical Sciences
September 1997 - July 2001
Bachelor of Science Computational Mathematics and Applied Software Peking University School of Mathematical Sciences

November 2020 - present
Professor Beijing Institute of Technology
March 2013 - October 2020
Associate Researcher, Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences
June 2008 - February 2013
Assistant Researcher, Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences
August 2006 - June 2008
Postdoctoral Fellow, Department of Mathematics and Statistics, University of North Carolina, Charlotte, USA

1. X. Ji, J. Sun, and T. Turner, A mixed finite element method for Helmholtz transmission eigenvalues, ACM Transactions on Mathematical Software, 38 (2012), article 29.
2. X. Ji, J. Sun, A multi-level method for transmission eigenvalues of anisotropic media, Journal of Computational Physics, 225 (2013), 422-435.
Y. Xi, X. Ji, and H. Geng, A C0IP method of Transmission Eigenvalues for Elastic Waves, Journal of Computational Physics, 374 (2018), 237-248.
3. P. Liu, X. Ji, and Z. Xu, Modified Poisson-Nernst-Planck model with accurate Coulomb correlation in variable media, SIAM Journal on Applied Mathematics, 78 (2018), 226-245.
4. X. Ji and X. Liu, Inverse electromagnetic source scattering problems with multi-frequency sparse phased and phaseless far field data，SIAM Journal on Scientific Computing，41 (2019), no. 6, B1368–B1388.
5. Y. Xi, X. Ji, and S. Zhang, A multi-level mixed element scheme of the two dimensional Helmholtz transmission eigenvalue problem, IMA Journal of Numerical Analysis, 40 (2020), 686-707.
6. X. Ji, Reconstruction of sources from time domain scattered waves at sparse sensors, Inverse Problems 37, (2021), 065010.
7. Q. Quan, X. Ji, S. Zhang, A lowest-degree quasi-conforming finite element de Rham complex on general quadrilateral grids by piecewise polynomials, Qimeng Quan · Xia Ji · Shuo Zhang , Calcolo, Calcolo, 2022, 59(1).