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in the percentage of variance, the map indicates a consolidated prevalence of this interrelated factor. Its descriptors tend to form more homogeneous groups that occupy more or less central positions. We might underline the case of Aged which

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1985 SCI (1982) Average (mean) citation rate in 1990, reported for 6 different chronological cohorts of scientists to normalise for the effect of scientific age Straight count

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1998 A new classification system to describe the ageing of scientific journals and their impact factors . Journal of Documentation 54 : 387 – 419 https://doi.org/10.1108/EUM0000000007175

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Introduction A rapid decrease in the workforce accompanying ageing societies in the developed countries stimulates discussion on various aspects of highly skilled workers’ international mobility, including demography, labour

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, after going through a maximum value, slowly decrease and finally attain a zero value with increasing time. This phenomenon is usually called obsolescence (Avramescu 1979 ; Gupta 1990 ; Egghe 1993 ; Egghe et al. 1995 ), aging (Egghe et al. 1995 ) or

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, although the universe is expanding, the cosmic density of the material distribution remains constant. Also, cosmologists using the value, estimated at that time, of Hubble's parameter H = 130 km/s/Mpc found that the age of the universe is less than the age

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fact a very slow, natural process, but it can be greatly accelerated by human activities that increase the rate of nutrient input in a water body. In scientific point of view, eutrophication is a process, rather than a state. It presents the aging

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Technology 2007 58 : 200 – 211 10.1002/asi.20476 . Borgmann , CL 2007 Scholarship in the digital age: Information, infrastructure, and the Internet MIT Press

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.5%) The female professors represented almost 27% of the total professors of the group under observation. On another hand, even if the initiative aimed at rejuvenating the professor staffs, we find out that the age-class 50 and more had even

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-authorship, it is age-biased since older authors usually have more publications and citations than younger ones, and it can never decrease even if the (co)author never publishes anything else (Glänzel 2006 ; Bornmann and Daniel 2007 ). However, due to

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