|Diffusion is movement of particles solids, liquids or gases from the high concentration to the level of low concentration. This usually results in attaining of equilibration. Diffusion is a passive type of transport which does not involve any usage of chemical energy. Concentration gradient plays an important role in the process of diffusion. Diffusion may be simple or facilitative or active transport.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.