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  • Article
    Citation - WoS: 2
    Anti-Immigration Conspiracy Beliefs Are Associated With Endorsement of Conventional and Violent Actions Opposing Immigration and Attitudes Towards Democracy Across 21 Countries
    (SpringerNature, 2025) Thomas, Emma F.; Stothard, Christina; Besta, Tomasz; Akbas, Gulcin; Becker, Julia C.; Becker, Maja; van Zomeren, Martijn
    Despite widespread speculation that conspiracy beliefs foster anti-democratic outcomes, the empirical picture is inconsistent. To clarify this literature, we examine the relationships that conspiracy beliefs have with commitment to reactionary action and criticism of democracy, focusing on a global issue: immigration. We expected that people who believe that their government uses immigration to diversify the population against citizens' wishes (anti-migration conspiracy beliefs) would be more committed to conventional and violent action to oppose immigration, and more critical of democracy. However, societal-level factors - economic performance and democratic functioning - were expected to influence (strengthen, weaken) these links. As hypothesized, multi-level analyses (N = 4353) from 21 countries revealed that economic prosperity attenuated the positive link between anti-migration conspiracy beliefs and commitment to reactionary action. Paradoxically, more democratic societies evidenced stronger links between conspiracy beliefs and conventional (but not violent) action to oppose immigration. Thus, more democratic societies appear to invite conventional forms of action to oppose immigration which may, in turn, weaken democratic norms of inclusion. Results highlight the interplay of individual- and societal-level factors underlying illiberal movements.
  • Article
    On Nonlocal Boundary Caputo Tempered Fractional Coupled Systems in Banach Spaces
    (SpringerNature, 2026) Kadari, Halima; Salim, Abdelkrim; Benchohra, Mouffak; Karapinar, Erdal
    We employ M & ouml;nch's fixed point theorem along with the technique of measure of non-compactness to establish the existence of solutions for a coupled system of tempered fractional differential equations with nonlocal boundary conditions. Additionally, we investigate the Ulam stability of the system as a qualitative aspect of our analysis. Finally, an illustrative example is provided to demonstrate that our approach meets the specific requirements set forth in the paper.
  • Article
    Citation - WoS: 1
    Citation - Scopus: 1
    4D-Printed Continuous Fiber-Reinforced PLA/TPU Auxetic Composites: Mechanical Performance, Energy Absorption, Shape Recovery, and Reusability Evaluation
    (SpringerNature, 2025) Alkan, Atakan; Ranjbar Aghjehkohal, Amin; Fallah, Ali; Koc, Bahattin
    This study explores the mechanical performance, energy absorption, shape recovery, and reusability of 4D-printed continuous carbon fiber-reinforced auxetic composite structures based on PLA/TPU blends, designed for load-bearing applications. PLA-TPU mixtures with different TPU content were developed to optimize the balance between flexibility and strength, with carbon fibers incorporated to enhance the mechanical properties of the resulting composites. Thermo-mechanical characterization of the blends was conducted, followed by a detailed evaluation of the structures' mechanical behavior and energy absorption capacity under room temperature conditions, simulating practical industrial scenarios. The shape recovery performance of these composite structures was also investigated. To assess reusability, the programming-recovery cycle was repeated five times, analyzing the retention of mechanical properties and shape recovery over multiple cycles to determine durability. Results revealed that TPU integration provided sufficient flexibility for cold programming, while carbon fiber reinforcement significantly enhanced stiffness and strength. The 4D-printed composites exhibited consistent shape recovery and maintained mechanical integrity after five cycles, confirming their reusability. These findings demonstrate the potential of 4D-printed PLA/TPU-based carbon fiber-reinforced composites as smart, durable materials for load-bearing applications in industries such as biomedical engineering, automotive, and aerospace.