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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
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Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars.

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Related Experiment Video

Updated: Jan 31, 2026

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Building a Large Solar Analog Sample Using K2.

Derek L Buzasi1

  • 1Dept. of Chemistry & Physics, Florida Gulf Coast University, 10501 FGCU Blvd. S., Fort Myers, FL 33965 USA.

Proceedings of the International Astronomical Union. International Astronomical Union
|December 21, 2018
PubMed
Summary

Researchers are creating a comprehensive catalog of solar analog stars to study stellar rotation, activity, and dynamos. This project uses K2 mission data and ground-based observations to analyze star properties for improved gyrochronology.

Keywords:
Sun:rotationstars:activitystars:variable

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Physics

Background:

  • Solar analogs are crucial for understanding stellar processes.
  • Previous studies lacked a consistent, well-calibrated sample of these stars.

Purpose of the Study:

  • To establish a large, consistent set of well-vetted solar analog stars.
  • To address fundamental questions in stellar rotation, activity, dynamos, and gyrochronology.

Main Methods:

  • Utilizing precise photometric time series data from the K2 mission.
  • Supplementing K2 data with ground-based photometric and spectroscopic observations.
  • Deriving key stellar parameters including rotation periods, spot coverages, and flare rates.

Main Results:

  • A well-defined and well-calibrated sample of solar analogs is being compiled.
  • Analysis will yield precise measurements of stellar rotation periods.
  • Detailed characterization of stellar activity, including spot coverage and flare rates, will be provided.

Conclusions:

  • This project will provide essential data for advancing our understanding of stellar evolution and activity.
  • The curated sample will serve as a valuable resource for future astrophysical research.
  • Improved gyrochronology models are expected from this comprehensive dataset.