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Related Concept Videos

Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
However, in reality, no machine can be truly ideal, and all of them experience some...
Journal Bearings01:23

Journal Bearings

Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
Potential-Energy Criterion for Equilibrium01:16

Potential-Energy Criterion for Equilibrium

Potential energy or potential function plays an essential role in determining the stability of a mechanical system. If a system is subjected to both gravitational and elastic forces, the potential function of the system can be expressed as the algebraic sum of gravitational and elastic potential energy. If the system is in equilibrium and is displaced by a small amount, then the work done on the system equals the negative of the change in the system's potential energy from the initial to the...
Rolling Resistance01:21

Rolling Resistance

When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Virtual Work01:20

Virtual Work

The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
Types of Friction Problems01:27

Types of Friction Problems

Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion.

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Related Experiment Video

Updated: May 9, 2026

Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases
05:02

Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases

Published on: October 24, 2019

Technical literature review.

Gunnar Nußbeck1, Murat Gök

  • 1Institute of Medical Informatics, Göttingen University Medical Center.

Studies in Health Technology and Informatics
|August 8, 2013
PubMed
Summary

Personal health monitoring (PHM) is a growing research field, with telemonitoring as its core technology. Technological advancements are paving the way for improved remote health and healthcare delivery through home monitoring applications.

Area of Science:

  • Biomedical Engineering
  • Health Informatics
  • Digital Health

Background:

  • Personal health monitoring (PHM) is a rapidly expanding research area, evidenced by the increasing annual publication rate.
  • Telemonitoring constitutes the primary technological focus within the PHM field.
  • The PHM-Ethics project aims to establish a common technical understanding among partners.

Purpose of the Study:

  • To provide a comprehensive technical overview of personal health monitoring.
  • To identify key measured parameters, application areas, participants, and stakeholders in PHM.
  • To explore the role of information and communication technology (ICT) in integrating PHM into healthcare decisions.

Main Methods:

  • A systematic literature search was conducted across relevant databases.

Related Experiment Videos

Last Updated: May 9, 2026

Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases
05:02

Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases

Published on: October 24, 2019

  • Review papers were retrieved and analyzed to synthesize current knowledge.
  • The review focused on the technical aspects and advancements in personal health monitoring.
  • Main Results:

    • The field of PHM is experiencing significant growth, with telemonitoring as a central technology.
    • Key aspects such as parameters, applications, and stakeholders have been identified.
    • ICT advancements are crucial for integrating PHM into remote decision-making and monitoring.

    Conclusions:

    • The removal of technological barriers in PHM opens new avenues for home-based health and healthcare delivery.
    • PHM technologies, particularly telemonitoring, are poised to transform healthcare.
    • Further integration of ICT is essential for realizing the full potential of PHM.