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Related Concept Videos

Machines01:19

Machines

559
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...
559
Machines: Problem Solving II01:30

Machines: Problem Solving II

649
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.
649
Machines: Problem Solving I01:22

Machines: Problem Solving I

695
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.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
695
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

488
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
488
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

753
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
753
Wind Turbine Machine Models01:24

Wind Turbine Machine Models

562
In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
562

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Programming DNA machines to move.

Selma Piranej1, Luona Zhang1, Alisina Bazrafshan1

  • 1Department of Chemistry, Emory University, Atlanta, GA, USA.

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DNA nanotechnology advances create dynamic nanoscale machines, motors, and switches. This review evaluates their performance against biological systems, highlighting design strategies and applications.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Engineering

Background:

  • DNA nanotechnology enables the creation of dynamic nanoscale and microscale devices.
  • These synthetic constructs can mimic natural molecular machinery.

Purpose of the Study:

  • To review the latest advancements in DNA-based machines, motors, and switches.
  • To establish clear definitions and a framework for evaluating these devices.
  • To compare synthetic DNA devices with biological counterparts like motor proteins.

Main Methods:

  • Analysis of key performance metrics (speed, force, efficiency, autonomy).
  • Exploration of design strategies including strand displacement, DNA origami, and hybrid systems.
  • Synthesis of current research on DNA-based nanoscale devices.

Main Results:

  • Identification of innovative design strategies enhancing DNA construct functionality.
  • Framework for evaluating DNA devices against biological systems (e.g., myosin, kinesin).
  • Demonstration of potential applications in drug delivery, biosensing, and nanofabrication.

Conclusions:

  • DNA nanotechnology offers promising tools for various applications.
  • Challenges remain in matching the performance and efficiency of biological systems.
  • Further research is needed to optimize DNA-based nanoscale and microscale devices.