Utilizing Forest Trees for Mitigation of Low-Frequency Ground Vibration Induced by Railway Operation by Zeyu Zhang, Xiaohui Zhang, Zhiyao Tian, Chao He

“…The influence of variability in tree height, radius, and density on system performance is subsequently examined using a Monte Carlo simulation. …”
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Superellipse Equation Describing the Geometries of <i>Abies alba</i> Tree Rings by Weiwei Huang, Kehang Ma, Jiaxin Tan, Meixiang Wei, Yunjie Lu

“…Where <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>r</mi></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>φ</mi></mrow></semantics></math></inline-formula> are the polar radius and polar angle, respectively. <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>k</mi><mo>=</mo><mi>β</mi><mo>/</mo><mi>a</mi></mrow></semantics></math></inline-formula>, where <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>a</mi></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>β</mi></mrow></semantics></math></inline-formula> are the major and minor semi-axes of the superellipse. …”
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Végétation des espaces boisés et paysage urbain by Francesca Di Pietro, Lotfi Mehdi

“…The proportion of woodland surface area compared with the urbanised surface areas adjacent to wooded areas of varying radiuses, are major factors in the botanic compositions of urban woods. …”
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