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  1. The topological sensitivity method is an optimization technique used in different inverse problem solutions. In this work, we adapt this method to the identification of plasma domain in a Tokamak. An asymptoti...

    Authors: Mohamed Abdelwahed, Nejmeddine Chorfi, Maatoug Hassine and Imen Kallel

    Citation: Boundary Value Problems 2021 2021:50

    Content type: Research

    Published on:

  2. In this paper, using variational method, we study the existence of an infinite number of solutions (some are positive, some are negative, and others are sign-changing) for a non-homogeneous elliptic Kirchhoff ...

    Authors: Baoqiang Yan, Donal O’Regan and Ravi P. Agarwal

    Citation: Boundary Value Problems 2021 2021:44

    Content type: Research

    Published on:

  3. In this paper, we introduce a new class of hemivariational inequalities, called dynamic boundary hemivariational inequalities, reflecting the fact that the governing operator is also active on the boundary. In...

    Authors: Khadija Aayadi, Khalid Akhlil, Sultana Ben Aadi and Mourad El Ouali

    Citation: Boundary Value Problems 2021 2021:43

    Content type: Research

    Published on:

  4. In this work, we create new oscillation conditions for solutions of second-order differential equations with continuous delay. The new criteria were created based on Riccati transformation technique and compar...

    Authors: Osama Moaaz, Choonkil Park, Elmetwally M. Elabbasy and Waed Muhsin

    Citation: Boundary Value Problems 2021 2021:35

    Content type: Research

    Published on:

  5. In the paper, we study a boundary value problem for a class of ψ-Hilfer fractional-order Langevin equations with multi-point integral boundary conditions. Existence and uniqueness results are established by using...

    Authors: Cholticha Nuchpong, Sotiris K. Ntouyas, Devaraj Vivek and Jessada Tariboon

    Citation: Boundary Value Problems 2021 2021:34

    Content type: Research

    Published on:

  6. The aim of this paper is to investigate the optimal harvesting strategies of a stochastic competitive Lotka–Volterra model with S-type distributed time delays and Lévy jumps by using ergodic method. Firstly, t...

    Authors: Hong Qiu, Wenmin Deng and Mingqi Xiang

    Citation: Boundary Value Problems 2021 2021:31

    Content type: Research

    Published on:

  7. This article has been retracted. Please see the Retraction Notice for more detail: https://​doi.​org/​10.​1186/​s13661-021-01502-z

    Authors: Yisheng Hu, Songhai Qin, Zhibin Liu and Yi Wang

    Citation: Boundary Value Problems 2021 2021:24

    Content type: Retraction Note

    Published on:

    The original article was published in Boundary Value Problems 2020 2020:75

  8. We consider the inertial Qian–Sheng’s Q-tensor dynamical model for the nematic liquid crystal flow, which can be viewed as a system coupling the hyperbolic-type equations for the Q-tensor parameter with the incom...

    Authors: Xiaoyuan Wang, Sirui Li and Tingting Wang

    Citation: Boundary Value Problems 2021 2021:21

    Content type: Research

    Published on:

  9. In this article we extend the known theory of solution regions to encompass nonlinear boundary conditions. We both provide results for new boundary conditions and recover some known results for the linear case.

    Authors: Marlène Frigon, Marcos Tella and F. Adrián F. Tojo

    Citation: Boundary Value Problems 2021 2021:19

    Content type: Research

    Published on:

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