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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

580
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
580

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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High precision zero-friction magnetic dendrometer.

Cameron Clonch1, Mark Huynh1, Bryson Goto1

  • 1Openly Published Environmental Sensing (OPEnS) Lab, Oregon State University, Corvallis, OR, USA.

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Summary
This summary is machine-generated.

A new high-precision dendrometer accurately measures plant water stress. This automated tool improves irrigation management for woody perennial crops, enhancing water resource efficiency in agriculture.

Keywords:
ArduinoCarbon fiberIrrigationMaximum daily shrinkage (MDS)Trunk growth rateVineyardWater-stress indicatorWoody plants

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Environmental Engineering

Background:

  • Agricultural demand for freshwater is rising due to climate change, necessitating efficient irrigation.
  • Soil water deficits negatively impact crop yield and quality, especially in high-value woody perennial crops.
  • Traditional dendrometer methods for measuring plant water stress are limited by mechanical hysteresis and thermal expansion.

Purpose of the Study:

  • To develop and validate a high-precision dendrometer for improved irrigation management.
  • To overcome limitations of existing dendrometer technologies for accurate water stress measurement.
  • To provide a reliable tool for decision support in agricultural water resource management.

Main Methods:

  • Development of a novel dendrometer utilizing zero-thermal expansion carbon fiber, spring tensioning for zero friction, and a linear magnetic encoder.
  • In-lab calibration and testing of the dendrometer's measurement accuracy and precision.
  • Field deployment and validation of the automated dendrometer in woody perennial crops.

Main Results:

  • The novel dendrometer effectively alleviates issues of mechanical hysteresis and thermal expansion.
  • Device measurements were validated through rigorous in-lab tests and field deployments.
  • The technology demonstrates high precision in continuously measuring stem diameter fluctuations.

Conclusions:

  • The high-precision dendrometer offers a significant advancement over existing methods for assessing plant water status.
  • Automated, continuous monitoring of water stress can optimize irrigation strategies for woody perennial crops.
  • Widespread adoption of this technology can enhance agricultural water-use efficiency and support climate change adaptation.