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Related Concept Videos

Latitudes and Departures01:27

Latitudes and Departures

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Latitudes and departures are essential concepts in surveying, providing a systematic way to analyze the projections of traverse lines. These projections allow surveyors to interpret a line's north-south and east-west components, which are crucial for precisely calculating areas, bearings, and lengths. Latitude is the north-south projection of a line, calculated as the product of the line's length and the cosine of its bearing. Departure, conversely, is the east-west projection obtained by...
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Compass01:23

Compass

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The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
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Design Example: Marking Boundaries of a Site Using a Compass01:12

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Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
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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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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Related Experiment Video

Updated: Aug 9, 2025

The Floating Lab: Standard Operational Procedure for Collecting and Filtering Seawater Samples from Operating Ferries for Environmental DNA Analysis
06:22

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Published on: August 1, 2025

147

Across the North Sea and beyond.

Carles Lalueza-Fox1

  • 1Natural Sciences Museum of Barcelona, Barcelona, Spain; Institute of Evolutionary Biology, Barcelona, Spain.

Trends in Genetics : TIG
|February 23, 2023
PubMed
Summary

Ancient Viking genomes reveal diverse ancestries and cosmopolitanism across North Sea regions. Mobility patterns significantly shaped genetic landscapes during this historical period.

Area of Science:

  • Genetics
  • Archaeology
  • History

Background:

  • The Viking Age (c. 790–1066 AD) is often characterized by expansion and trade.
  • Understanding the genetic underpinnings of Viking Age populations is crucial for reconstructing past societies.

Purpose of the Study:

  • To analyze ancient genomes from the Viking period across North Sea regions.
  • To investigate the genetic diversity and population movements during the Viking Age.

Main Methods:

  • High-throughput sequencing of ancient DNA (aDNA).
  • Analysis of genomic data to infer ancestry and population structure.
  • Geographic and temporal mapping of genetic findings.

Main Results:

  • Ancient genomes demonstrate a complex tapestry of genetic ancestries within Viking Age populations.
Keywords:
ScandinaviaViking periodcosmopolitanismmigrationpaleogenomics

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  • Evidence suggests significant gene flow and admixture across North Sea regions.
  • Distinct mobility patterns correlate with observed genetic variations.
  • Conclusions:

    • The Viking period was characterized by greater genetic cosmopolitanism than previously understood.
    • Mobility patterns were a key driver of genetic exchange and population dynamics.
    • Ancient genomics provides unprecedented insights into the interconnectedness of Viking Age societies.