Results 141 to 150 of about 429 (164)

Conservation laws for Lotka–Volterra models

Mathematical Methods in the Applied Sciences, 2003
AbstractWe derive necessary and sufficient conditions on a Lotka–Volterra model to admit a conservation law of Volterra's type. The result and the proof for the corresponding linear algebra problem are given in graph‐theoretical terms; they refer to the directed graph which is defined by the coefficients of the differential equation system. Copyright ©
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Application of Lotka’s Law in Current Science Journal

Journal of Information Management, 2020
Purpose: The purpose of the study is to examine the application of Lotka’s law in current science journals. Aim: To investigate the scientific productivity of authorship patterns in current science journals. To verify the Lotka’s law using general power method (n?2) and inverse square method (n=2) and to analyse the frequency distribution of author’s ...
M. Thamaraiselvi, S. Lakshmi, M. Manthiramoorthi   +2 more
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The reflection of LOTKA's law in the structure of citations of a journal

Scientometrics, 1983
A complex structure measure for social groups was applied to the structure of citations in a journal. The citation structure reflected LOTKA's law on the various levels of group structure measure. On the first structure level the reciprocal effect of social and cognitive factors became discernible.
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Lotka’s law for the Brazilian scientific output published in journals

Journal of Information Science, 2018
Lotka’s law is a power law for the frequency of scholarly publications. We show that Lotka’s law cannot be dismissed after considering a massive sample of the number of publications of Brazilian researchers in journals listed on the SCImago Journal Rank and the Journal Citation Reports. For the SCImago Journal Rank, we found a power law with the Pareto
Sergio Da Silva, Marcelo Perlin, Raul Matsushita, André Alves Portela Santos, Takeyoshi Imasato, Denis Borenstein   +5 more
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Productivity differences fields of learning, and Lotka's law

Scientometrics, 1989
The paper examines whether productivity differences among individual researchers are larger in some fields of learning than in others. Productivity patterns in the natural sciences, the medical sciences, the social sciences, and the humanities are compared by the use of unweighted and weighted publication counts. Irrespective of whether total number of
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Analysis of Lotka's law: The Simon-Yule approach

Information Processing & Management, 1989
Abstract A major difficulty in using the well-known Lotka's law in information science is in the estimation of parameters. In this paper, we argue that the difficulty arises from the misuse of goodness-of-fit tests. As an alternative, we adopt Simon's five-step modeling process for the study of Lotka's law.
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Lotka's Law and Authorship Distribution in the Journal of ‘Columbia Law Review’

Collnet Journal of Scientometrics and Information Management, 2014
This paper examines the validity of Lotka's law to authorship distribution on the subject Area “LAW”. In the process, we chose to consider the articles published under Columbia Law Review (CLR) since from its inception i.e. during 1901–2012 for the study. Lotka's law constituting the most significant bibliometric law is applied and tested using various
Kiran Savanur, S. Gayathri Devi, P. V. Konnur   +2 more
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A Re-evaluation of Lotka's Law of Scientific Productivity

Social Studies of Science, 1982
This Note examines the data base used by Lotka in propounding his Law, and by Price in elaborating it, and questions the validity of the generalizations drawn from it.
Michael H. MacRoberts, Barbara R. MacRoberts   +1 more
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Validity of Lotka’s Law in Geology Literature

KIIT Journal of Library and Information Management
The present paper analyzes the pattern of authorship and various collaboration measures in the field of Geology literature during 1989-2020. The Web of Science database was used to download a total of 19,102 papers. These papers were published in the form of articles, reviews, and conference proceeding papers during 1989-2020.
Garvita Jhamb, null Meera
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Lotka's law and the literature of computer science

IEEE Transactions on Professional Communication, 1979
From empirical data on the authorship of scientific papers, Alfred Lotka deduced on inverse-square law relating the number of authors of scientific papers to the number of papers written by each author. A basic assumption underlying Lotka's law is that the number of papers published by a scientist is a measure of his contribution to science.
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