# Determination of Time-Dependent Coefficients in Time-Fractional Diffusion Equations by Variational Iteration Method

*Mimi Li*,
*Gongsheng Li*,
*Zhiyuan Li* and
*Xianzheng Jia*

*Journal of Mathematics Research*, 2020, vol. 12, issue 1, 74

**Abstract:**
Inverse problems of determining time-dependent coefficients in partial differential equations are difficult to deal with in general cases. The variational iteration method is introduced to determine the time-dependent coefficient in the fractional diffusion equation as well as the solution of the forward problem. By utilizing the additional condition and the property of the fractional derivative, an expression of the unknown is derived by which a nonlinear dynamical differential equation is obtained. The variational iteration method is applied to solve the nonlinear system and the time-dependent coefficient can be reconstructed in a semi-analytical form. Such method can give explicit expression of the solution in the meaning of approximation, or exact solution to the inverse problem in some cases. Several examples are presented to demonstrate feasibility and effectiveness of the proposed method for inverse time-dependent coefficient problems in the fractional diffusion equations.

**JEL-codes:** R00 Z0 (search for similar items in EconPapers)

**Date:** 2020

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