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Related Concept Videos

Significance of Center of Mass01:12

Significance of Center of Mass

The center of mass of an object is defined as the mass-weighted average position of all the particles that comprise the object. The significance of the center of mass of an object can be seen by looking at its dynamics. The time derivative of the center of mass gives its velocity, assuming that the object's mass remains constant over time. Furthermore, the total linear momentum of an object can be seen as the linear momentum of a single particle of the object's total mass moving with the...
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Design Consideration01:22

Design Consideration

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.
The factor of safety is another key aspect...
Stress Concentrations01:24

Stress Concentrations

Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller width...
Stress Concentrations01:13

Stress Concentrations

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 concentration...
Principal Stresses01:24

Principal Stresses

The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...

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Related Experiment Video

Updated: Jul 18, 2026

Comparing the Frequency Effect Between the Lexical Decision and Naming Tasks in Chinese
08:08

Comparing the Frequency Effect Between the Lexical Decision and Naming Tasks in Chinese

Published on: April 1, 2016

Emphasis on holotype (?).

J M SCHOPF

    Science (New York, N.Y.)
    |April 8, 1960
    PubMed
    Summary

    Species descriptions require more than just holotype details. The holotype, or name-bearer, is crucial for nomenclature but doesn't represent the full species diversity.

    Area of Science:

    • Taxonomy and Systematics
    • Zoological Nomenclature

    Background:

    • The traditional focus on holotype physical descriptions limits comprehensive species characterization.
    • Holotypes are essential for naming but may not encompass the full spectrum of species variation.

    Purpose of the Study:

    • To advocate for broader species descriptions beyond the holotype.
    • To clarify the distinct roles of holotype versus typical specimens in taxonomy.

    Main Methods:

    • Review of current practices in species description.
    • Analysis of the nomenclatural function of holotypes.

    Main Results:

    • Holotypes serve a primary nomenclatural function (name-bearer).
    • A single holotype specimen cannot represent all characters or the typical variation within a taxon.
    Keywords:
    NOMENCLATURE

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    Robust Comparison of Protein Levels Across Tissues and Throughout Development Using Standardized Quantitative Western Blotting
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    Last Updated: Jul 18, 2026

    Comparing the Frequency Effect Between the Lexical Decision and Naming Tasks in Chinese
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    Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
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    Robust Comparison of Protein Levels Across Tissues and Throughout Development Using Standardized Quantitative Western Blotting
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    Conclusions:

    • Species descriptions must incorporate data beyond the holotype.
    • Distinguishing between 'type specimen' and 'typical specimen' is vital for accurate taxonomy.