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Related Concept Videos

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...
The Scientific Method01:32

The Scientific Method

The scientific method is a detailed, empirical problem-solving process used by biologists and other scientists. This iterative approach involves formulating a question based on observation, developing a testable potential explanation for the observation (called a hypothesis), making and testing predictions based on the hypothesis, and using the findings to create new hypotheses and predictions.Generally, predictions are tested using carefully-designed experiments. Based on the outcome of these...
Types of Impact01:30

Types of Impact

Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
Impact01:30

Impact

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
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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

Article and journal impact factor in various scientific fields.

Matthew E Falagas1, Eustratia Charitidou, Vangelis G Alexiou

  • 1Alfa Institute of Biomedical Sciences, Marousi, Greece. m.falagas@aibs.gr

The American Journal of the Medical Sciences
|March 18, 2008
PubMed
Summary
This summary is machine-generated.

Most scientific fields publish over 50% of articles in journals above the median impact factor. However, it

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Area of Science:

  • Analysis of publication trends across diverse scientific disciplines.
  • Focus on bibliometric indicators and journal impact factor distribution.

Background:

  • Investigating the proportion of scientific publications appearing in journals exceeding median and mean impact factor values.
  • Addressing a fundamental question regarding publication distribution within scientific fields.

Purpose of the Study:

  • To quantify the percentage of articles published in journals with impact factors above established benchmarks (mean and median).
  • To compare the distribution of journal impact factors at the article level across various scientific domains.

Main Methods:

  • Analysis of impact factor data aggregated at the article level.
  • Calculation of proportions of articles in journals above journal mean impact factor, journal median impact factor, and article mean impact.
  • Comparison of impact factor distributions across 19 scientific fields.

Main Results:

  • In most scientific fields, the mean impact factor at the article level exceeds the median.
  • Journal mean impact factor is generally lower than the mean impact factor of articles.
  • Over 50% of articles were published in journals above the median impact factor in 17 of 19 fields.

Conclusions:

  • Publishing in a top 50% impact factor journal is more common than an article ranking in the top 50% of published articles.
  • Bibliometric analysis reveals skewed distributions of impact factors within scientific publishing.