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Related Concept Videos

Plasticity00:58

Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Plasticizers01:31

Plasticizers

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Plastic Deformations01:19

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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5-Number Summary01:04

5-Number Summary

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In a dataset, the 5-number summary includes the minimum data value, the data value of the first quartile, the median data value or data value of the second quartile, the data value of the third quartile, and the maximum data value. These 5 data values can be visualized as a box and whisker plot.
In a box plot, the minimum and maximum data values represent the lower and upper whiskers in the graph, and the median is designated as the center of the box in the chart. The first quartile and third...
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The 5-point Modified Frailty Index in Plastic and Reconstructive Surgery: Meta-analysis.

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Area of Science:

  • Surgical outcomes research
  • Geriatric surgery
  • Patient risk stratification

Background:

  • Frailty is a critical predictor of adverse surgical outcomes.
  • The 5-item modified frailty index (mFI-5) simplifies frailty assessment.
  • The utility of mFI-5 in plastic and reconstructive surgery is underexplored.

Purpose of the Study:

  • To evaluate and quantify the predictive value of frailty (mFI-5) on postoperative outcomes in plastic and reconstructive surgery.
  • To assess the association between frailty and adverse events in this patient population.

Main Methods:

  • Systematic literature search of PubMed, Embase, Web of Science, and Cochrane Library.
  • Inclusion of studies comparing frail (mFI-5 ≥ 2) versus nonfrail patients.
  • Data extraction, risk of bias, and quality assessment by two independent reviewers.

Main Results:

  • Twenty-nine studies with 302,641 patients were analyzed.
  • Frailty (mFI-5) significantly correlated with increased complications, readmission, reoperation, and mortality.
  • Subgroup analyses consistently confirmed elevated risks across various procedures and populations.

Conclusions:

  • Frailty, assessed by mFI-5, is linked to higher postoperative risks in plastic and reconstructive surgery.
  • Findings support mFI-5 integration into clinical practice and preoperative decision-making.
  • This index can enhance patient evaluation and risk management.