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Related Concept Videos

Turbine-Governor Control01:17

Turbine-Governor Control

Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Generator Voltage Control01:21

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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

High performance magnetically controllable microturbines.

Ye Tian1, Yong-Lai Zhang, Jin-Feng Ku

  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.

Lab on a Chip
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

This study reports the fabrication of magnetic microturbines using two-photon photopolymerization (TPP). These microturbines enable efficient microfluidic mixing and advance lab-on-a-chip applications.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Nanotechnology

Background:

  • Microfluidic devices require efficient mixing for various applications.
  • Controllable micro-mixing devices are essential for lab-on-a-chip (LOC) systems.
  • Fabrication of magnetic microstructures with high precision is challenging.

Purpose of the Study:

  • To develop a method for fabricating magnetic microturbines using two-photon photopolymerization (TPP).
  • To create high-quality magnetic photoresists for advanced microdevice fabrication.
  • To demonstrate the application of these microturbines in microfluidic mixing.

Main Methods:

  • Synthesized oleic acid-stabilized Fe(3)O(4) nanoparticles via high-temperature organic phase decomposition.
  • Modified nanoparticles with propoxylated trimethylolpropane triacrylate (PO(3)-TMPTA) cross-linker.
  • Homogeneously doped nanoparticles into acrylate-based photoresist for TPP fabrication.

Main Results:

  • Achieved high surface smoothness in fabricated magnetic microturbines.
  • Successfully fabricated magnetic microturbines for remote control of microfluidic blending.
  • Demonstrated homogeneous doping of Fe(3)O(4) nanoparticles in photoresist.

Conclusions:

  • High-quality magnetic photoresists are crucial for high-performance magnetically controllable microdevices.
  • TPP fabrication enables precise manufacturing of magnetic microstructures.
  • Developed microturbines show potential for advanced LOC applications requiring microfluidic manipulation.