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