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Related Concept Videos

Plasticity00:58

Plasticity

3.1K
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...
3.1K
Plasticizers01:31

Plasticizers

378
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...
378
Plastic Behavior01:21

Plastic Behavior

585
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...
585
Plastic Deformations01:14

Plastic Deformations

477
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...
477
Plastic Deformations01:19

Plastic Deformations

477
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...
477
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

487
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
487

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Related Experiment Video

Updated: Feb 12, 2026

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies
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Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

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LIBERTI: A SMART study in plastic surgery.

Jonathan C Hibbard1,2, Jonathan S Friedstat3, Sonia M Thomas4

  • 11 Department of Biostatistics, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Clinical Trials (London, England)
|March 27, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel trial design to evaluate laser scar treatment effectiveness. It aims to personalize treatments for hypertrophic burn scars based on individual patient responses.

Keywords:
CO2 laserHypertrophic scarringQ-learningSequential Multiple Assignment Randomized Trialburnclinical trialdynamic treatment regimedynamic treatment rulefactorial experimentindividualized treatment rulelaser treatmentoutcome-weighted learningplastic surgeryprecision medicinepulsed-dye lasersurgery

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Area of Science:

  • Plastic Surgery
  • Dermatology
  • Biomedical Engineering

Background:

  • Laser treatment for burn scars lacks robust evidence despite common use.
  • Evaluating laser efficacy is challenging due to varied patient responses and complex treatment protocols.
  • Existing research has not adequately compared different laser treatment combinations or personalized approaches.

Purpose of the Study:

  • To assess the effectiveness of various laser treatment combinations for hypertrophic burn scars.
  • To develop personalized treatment plans by leveraging individual patient characteristics and responses.
  • To establish a new trial methodology for plastic surgery research.

Main Methods:

  • Employing a Sequential Multiple Assignment Randomized Trial (SMART) design.
  • Comparing multiple laser treatment permutations to evaluate population-level effects.
  • Generating data for precision medicine by analyzing patient-specific responses.

Main Results:

  • The proposed trial design demonstrates sufficient power to detect laser treatment effects at the population level.
  • The study simulations indicate potential for identifying personalized laser treatment benefits.
  • The trial will yield high-quality data for estimating precision medicine treatment rules.

Conclusions:

  • This study proposes the first Sequential Multiple Assignment Randomized Trial in plastic surgery.
  • The trial is designed to be implementable and powered for generalizable findings.
  • The methodology supports the estimation of personalized treatment strategies based on patient data and treatment response.