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相关概念视频

Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

69
Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
69
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

16.5K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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Migration00:53

Migration

8.1K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

168
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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相关实验视频

Updated: Sep 9, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

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将地理限制与人类流动性脱

Louis Boucherie1,2, Benjamin F Maier1,2, Sune Lehmann3,4

  • 1DTU Compute, Technical University of Denmark, Kongens Lyngby, Denmark.

Nature human behaviour
|September 1, 2025
PubMed
概括
此摘要是机器生成的。

人类移动模式在考虑地理限制时表现出一种力量规律. 这项研究揭示了定居点的空间分布如何影响移动,将距离和机会模型联系起来.

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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function
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Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function

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相关实验视频

Last Updated: Sep 9, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
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Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

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Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function
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Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function

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科学领域:

  • 复杂的系统
  • 空间分析
  • 人类地理

背景情况:

  • 人类移动性研究已经以大量数据集进步,揭示了无尺度的移动模式.
  • 现有的模型解释了无尺度分布,但往往忽视了地理限制.

研究的目的:

  • 研究地理结构对人类流动模式的影响.
  • 将地理信息纳入移动模式.

主要方法:

  • 分析数以百万计的人类运动记录.
  • 使用对分布函数将地理结构纳入.
  • 将地理影响与个人移动选择分开.

主要成果:

  • 当考虑地理位置时,发现了人类流动性的一种权力规律关系,涵盖了五个数量级.
  • 配对分布函数有效地捕捉空间位置结构对运动的影响.
  • 人类定居点的空间分布在很大程度上影响了流动性.

结论:

  • 地理限制是人类流动模式的关键决定因素.
  • 这项研究弥合了基于距离和基于机会的流动模式之间的差距.
  • 了解定居点的结构是预测人类移动的关键.