In this issue

Suboptimal Feedback Control of PDEs by Solving HJB Equations on Adaptive Sparse Grids
Jochen Garcke & Axel Kröner

A Robust Inversion Method for Quantitative 3D Shape Reconstruction from Coaxial Eddy Current Measurements
Houssem Haddar, Zixian Jiang & Mohamed Kamel Riahi

Optimal Quadrilateral Finite Elements on Polygonal Domains
Hengguang Li & Qinghui Zhang

Unconditional Superconvergence Analysis for Nonlinear Parabolic Equation with $${\textit{EQ}}_1^{rot}$$ EQ 1 r o t Nonconforming Finite Element
Dongyang Shi, Junjun Wang & Fengna Yan

An Unconditionally Stable Quadratic Finite Volume Scheme over Triangular Meshes for Elliptic Equations
Qingsong Zou

Superconvergent Two-Grid Methods for Elliptic Eigenvalue Problems
Hailong Guo, Zhimin Zhang & Ren Zhao

Local and Parallel Finite Element Algorithm Based on Oseen-Type Iteration for the Stationary Incompressible MHD Flow
Qili Tang & Yunqing Huang

The Highest Superconvergence Analysis of ADG Method for Two Point Boundary Values Problem
Jiangxing Wang, Chuanmiao Chen & Ziqing Xie

Galerkin Method for the Scattering Problem of a Slit
Yujie Wang, Fuming Ma & Enxi Zheng

Performance and Scalability Improvements for Discontinuous Galerkin Solutions to Conservation Laws on Unstructured Grids
S. R. Brus, D. Wirasaet, J. J. Westerink & C. Dawson

Large-Scale Optimization-Based Non-negative Computational Framework for Diffusion 
Equations: Parallel Implementation and Performance Studies
J. Chang, S. Karra & K. B. Nakshatrala

Uniform Convergent Tailored Finite Point Method for Advection–Diffusion Equation with Discontinuous,Anisotropic and Vanishing Diffusivity
Min Tang & Yihong Wang

On Second Order Semi-implicit Fourier Spectral Methods for 2D Cahn–Hilliard Equations
Dong Li & Zhonghua Qiao

A New Finite Element Analysis for Inhomogeneous Boundary-Value Problems of Space Fractional Differential Equations
Jingtang Ma

High-Order Accurate Local Schemes for Fractional Differential Equations
Daniel Baffet & Jan S. Hesthaven

A Galerkin Finite Element Method for a Class of Time–Space Fractional Differential Equation with Nonsmooth Data
Zhengang Zhao, Yunying Zheng & Peng Guo

Two Mixed Finite Element Methods for Time-Fractional Diffusion Equations
Yanmin Zhao, Pan Chen, Weiping Bu, Xiangtao Liu & Yifa Tang

Accuracy of Finite Element Methods for Boundary-Value Problems of Steady-State Fractional Diffusion Equations
Hong Wang, Danping Yang & Shengfeng Zhu