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Related Concept Videos

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Errors in Global Positioning System

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Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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Common Leveling Mistakes and Errors01:17

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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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Local Attraction01:22

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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Updated: Dec 27, 2025

Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
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Home, head direction stability, and grid cell distortion.

Juan Ignacio Sanguinetti-Scheck1, Michael Brecht1,2

  • 1Bernstein Center for Computational Neuroscience, Humboldt-Universität zu Berlin, Berlin, Germany.

Journal of Neurophysiology
|February 27, 2020
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Summary
This summary is machine-generated.

Rats

Keywords:
grid cellhead directionhomehomingnavigation

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Area of Science:

  • Neuroscience
  • Spatial Navigation
  • Cognitive Science

Background:

  • The home environment is crucial for animal navigation.
  • Understanding how animals navigate complex spaces is key to understanding brain function.
  • Previous studies often use abstract environments, lacking biological context.

Purpose of the Study:

  • To investigate how the presence of a rat's home cage affects neural representations of space.
  • To examine the activity of head direction and grid cells in the medial entorhinal cortex and parasubiculum when the home cage is embedded in an arena.

Main Methods:

  • Laboratory rats were used, with their home cages embedded in a larger arena.
  • Neural activity was recorded from the parasubiculum and medial entorhinal cortex.
  • Head direction and grid cell activity were analyzed in the presence and absence of the home cage.

Main Results:

  • Head direction cells remained globally stable, unaffected by the home cage.
  • Grid cells showed local distortions, with firing fields translocating towards the home cage.
  • These distortions appeared geometrical, not specific to the home cage or a hoarding task.

Conclusions:

  • The medial entorhinal cortex and parasubiculum do not globally remap when the home cage is embedded.
  • Local distortions in grid cell activity may help represent the embedded home space.
  • These findings offer insights into navigation within complex, biologically relevant environments.