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Related Concept Videos

Percentile01:18

Percentile

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A percentile indicates the relative standing of a data value when data are sorted into numerical order from smallest to largest. It represents the percentages of data values that are less than or equal to the pth percentile. For example, 15% of data values are less than or equal to the 15th percentile.
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Support Reactions01:30

Support Reactions

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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Stress Concentrations01:13

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The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
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Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Principal Stresses in a Beam01:11

Principal Stresses in a Beam

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In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
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Monotypic genera: uninformative, but sometimes necessary.

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Quantitative Static and Dynamic Assessment of Balance Control in Stroke Patients
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"Maximum support" = 100% BS.

Andrew V Z Brower1

  • 1Evolution and Ecology Group, Department of Biology, Middle Tennessee State University, Murfreesboro, TN, 37132, USA.

Cladistics : the International Journal of the Willi Hennig Society
|October 11, 2021
PubMed
Summary
This summary is machine-generated.

Percentage-based measures for nodal support, like bootstrapping, fail to differentiate between strong and very strong support. New methods are needed to quantify support when there is no upper limit on potential characters.

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Area of Science:

  • Phylogenetic analysis
  • Computational biology
  • Statistical modeling

Background:

  • Nodal support measures in phylogenetic analysis, such as bootstrapping, are widely used to assess the reliability of inferred evolutionary relationships.
  • Current methods provide a percentage-based score, but this scale has limitations in distinguishing high levels of support.

Discussion:

  • The study critically evaluates the limitations of percentage-based metrics in phylogenetic tree reconstruction.
  • It highlights that these metrics cannot differentiate between varying degrees of strong support, potentially misrepresenting confidence in evolutionary hypotheses.

Key Insights:

  • Bootstrap values and similar metrics offer an insufficient range to distinguish between strong and very strong nodal support.
  • A lack of an upper bound in potential characters necessitates the development of support measures without inherent upper limits.

Outlook:

  • Future research should focus on developing novel, unbounded metrics for nodal support in phylogenetic analyses.
  • This advancement will enable more nuanced and accurate assessments of evolutionary relationships and statistical confidence.