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Related Concept Videos

Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the problem,...
Machines01:19

Machines

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
Machines: Problem Solving I01:22

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Machines: Problem Solving II01:30

Machines: Problem Solving II

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
Electro-mechanical Systems01:19

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Automatic Processing and Automatic Social Behavior01:28

Automatic Processing and Automatic Social Behavior

Automatic processing refers to the cognitive operations that occur without conscious intent or awareness, playing a fundamental role in shaping social cognition and behavior. These processes enable individuals to navigate complex social environments efficiently by relying on mental shortcuts and pre-existing knowledge structures known as schemas. One of the most influential mechanisms underlying automatic processing is priming, which subtly activates mental representations through exposure to...

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Updated: May 15, 2026

Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy
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Machine Learning Enabled Fluorescent Anti-Freezing Core-Shell Hydrogel Realizing Deep-Sea Morse Code Communication

Yanqi Yin1, Tianxiang Gao2, Bingchen Zhou1

  • 1Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Sciences and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P. R. China.

Nano Letters
|November 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a robust, antifreezing hydrogel for underwater intelligent systems. This flexible material enables advanced sensing, control, and communication in extreme environments, enhancing human-machine interaction.

Keywords:
antifreezingantiswellingcore−shell structurehuman-machine interactionmachine learning

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Area of Science:

  • Materials Science
  • Robotics
  • Biomedical Engineering

Background:

  • Underwater intelligent systems require durable, flexible materials.
  • Conventional hydrogels lack robustness and environmental tolerance for harsh underwater conditions.

Purpose of the Study:

  • To fabricate an antifreezing and antiswelling hydrogel with core-shell architecture.
  • To develop a hydrogel-based system for integrated sensing, control, and communication in extreme underwater environments.

Main Methods:

  • Fabrication of a core-shell hydrogel using ion concentration gradient modulation.
  • Utilizing polyacrylamide/poly(acrylic acid) pregel in an Al3+ solution.
  • Employing machine learning for Morse code decoding to establish underwater communication.

Main Results:

  • The hydrogel exhibited excellent mechanical robustness (561% strain, 0.188 MPa stress).
  • Achieved superior frost resistance (-48 °C) and a fast response time (198 ms).
  • Demonstrated a functional nonverbal underwater communication system for remote control and interaction.

Conclusions:

  • The novel hydrogel offers a promising solution for underwater intelligent systems.
  • The integrated system provides innovative strategies for digital motion monitoring and human-machine interaction in extreme conditions.