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Related Concept Videos

Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
Latent tuberculosis infection occurs when TB bacteria are present in a person's body, but are not causing illness or symptoms. It is not contagious, and preventive treatment is crucial to avoid the progression...

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Related Experiment Video

Updated: May 22, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
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Published on: October 18, 2012

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Ideal energy-absorbing metamaterials based on self-locking bistable structures.

Kuan Liang1, Xiaopeng Zhang1, Qi Zhao1

  • 1State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China. zhangxiaopeng@dlut.edu.cn.

Materials Horizons
|May 7, 2025
PubMed
Summary

This study introduces a novel energy-absorbing metamaterial that combines efficient energy absorption with a self-locking mechanism. This advanced material offers improved impact protection and programmability for versatile applications.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metamaterials

Background:

  • Current energy-absorbing materials often lack sufficient capacity or self-locking features.
  • There is a need for advanced materials with enhanced impact protection and controlled energy dissipation.

Purpose of the Study:

  • To develop a novel energy-absorbing metamaterial with a rectangular force-displacement curve and self-locking capability.
  • To enhance energy absorption capacity and introduce programmability for impact protection systems.

Main Methods:

  • Topology optimization was used to customize curved beams.
  • A snap-fit structure was integrated to create a self-locking mechanism.
  • Additive manufacturing was employed for experimental validation.

Main Results:

  • The designed metamaterial achieved a force-displacement curve error of less than 8.55%.
  • Energy absorption capacity was increased by 75% compared to unoptimized structures.
  • Sequential steady-state locking ensured design precision and reliability.

Conclusions:

  • The novel metamaterial offers superior energy absorption and self-locking capabilities.
  • The design demonstrates high programmability and flexible adjustment for impact protection.
  • This work provides a new pathway for developing controllable and optimized energy absorption systems.