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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Related Experiment Video

Updated: Nov 5, 2025

Community-based Adapted Tango Dancing for Individuals with Parkinson's Disease and Older Adults

Community-based Adapted Tango Dancing for Individuals with Parkinson's Disease and Older Adults

Published on: December 9, 2014

Moving Forward Together.

Maureen Shawn Kennedy¹

¹AJN Editor-in-Chief shawn.kennedy@wolterskluwer.com.

The American Journal of Nursing

|May 19, 2021

Summary

This summary is machine-generated.

Despite significant progress against COVID-19, continued research and public health efforts are essential for complete recovery. Further work is needed to fully overcome the pandemic

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Area of Science:

Virology and Epidemiology
Public Health and Policy

Background:

The COVID-19 pandemic has presented unprecedented global health challenges.
Rapid scientific advancements have led to vaccines and treatments.

Discussion:

Ongoing viral evolution necessitates continuous surveillance and adaptation of countermeasures.
Socioeconomic impacts require sustained attention and targeted interventions.

Key Insights:

Vaccine efficacy and accessibility remain critical factors in pandemic control.
Understanding long-term health consequences of COVID-19 is an emerging research priority.

Outlook:

Continued global cooperation is vital for addressing future pandemic threats.
Sustained investment in public health infrastructure will enhance resilience.