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Related Concept Videos

Standing Waves01:17

Standing Waves

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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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CRISPR01:59

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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
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Ergonomics and the standing desk.

Allison Mula1

  • 1Student, On-line Post-professional Doctorate in Occupational Therapy, College of Health and Rehabilitation Sciences, Sargent College, Boston University, Boston, MA, USA.

Work (Reading, Mass.)
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

Sit-stand desks are trending, but prolonged standing poses health risks. A healthy workspace requires regular movement and position changes, not just avoiding sitting.

Keywords:
Ergonomicshealth and wellnessoccupational therapypreventative caresedentary behaviorstanding desksworkplace ergonomicsworkplace health

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Public Health

Background:

  • The workplace is seeing a trend towards sit-stand desks, driven by fears that prolonged sitting is as harmful as smoking.
  • This has led to a focus on standing at computer workstations, with sit-stand desks presented as a simple solution.

Purpose of the Study:

  • To critically evaluate the trend of sit-stand desks in the workplace.
  • To discuss research on the potential negative effects of prolonged standing.
  • To advocate for a broader understanding of workplace wellness beyond equipment.

Main Methods:

  • Review of current trends and workplace fads.
  • Analysis of existing research on the physiological effects of prolonged sitting and standing.
  • Conceptual analysis of workplace health and wellness strategies.

Main Results:

  • Prolonged standing, like prolonged sitting, can have detrimental effects on the human system.
  • The 'standing is healthy' fad oversimplifies the complex issue of workplace physical health.
  • Current interventions may not fully address the risks associated with sedentary work.

Conclusions:

  • A healthy work environment should prioritize movement and changes in posture.
  • Empowering workers with knowledge about their musculoskeletal and physiological health is crucial.
  • Shifting focus from 'sitting is the new smoking' to 'sedentary behavior is the new smoking' promotes a more holistic approach to workplace wellness.