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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Updated: Sep 19, 2025

Wind Tunnel Experiments to Study Chaparral Crown Fires
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Forest fire as a temperature-pattern-driven depinning problem.

J Cheraghalizadeh1, Hans J Herrmann2,3, M N Najafi1

  • 1University of Mohaghegh Ardabili, Department of Physics, P.O. Box 179, Ardabil, Iran.

Physical Review. E
|June 19, 2025
PubMed
Summary
This summary is machine-generated.

A new forest fire model reveals how environmental factors drive transitions in tree burning patterns. Spatial correlations significantly alter these patterns, challenging existing theories on driven interfaces.

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Area of Science:

  • Physics
  • Ecology
  • Statistical Mechanics

Background:

  • Forest fires are complex phenomena influenced by environmental factors and spatial tree arrangements.
  • Understanding the dynamics of burning clusters is crucial for ecological modeling and risk assessment.

Purpose of the Study:

  • To introduce and analyze a weighted isotropic forest fire model (WFFM) incorporating environmental factors and spatial correlations.
  • To investigate the depinning transition of burning clusters and its dependence on model parameters.
  • To explore the impact of spatial correlations on universality classes of driven interfaces.

Main Methods:

  • Developed a weighted isotropic forest fire model (WFFM).
  • Modeled spatial tree configurations using uncorrelated percolation (occupation probability p) and correlated percolation (Ising model with temperature T).
  • Analyzed depinning transitions and calculated critical exponents and hull fractal dimensions.

Main Results:

  • Identified a depinning transition driven by the external parameter β.
  • For uncorrelated percolation, critical exponents align with the percolation universality class.
  • Introduced spatial correlations shifted the universality class for driven interfaces, with hull fractal dimension varying from 1.34(1) to 1.73(2).

Conclusions:

  • The WFFM provides a framework for studying driven interfaces influenced by environmental factors and spatial structure.
  • Spatial correlations fundamentally alter the behavior of burning clusters, leading to new universality classes.
  • Findings challenge previous predictions and open new research avenues in interface dynamics.