Results 21 to 30 of about 2,202 (163)
A Lei de Lotka na bibliometria brasileira [PDF]
Ciência da Informação, 2002 Usando os dados reportados em artigos publicados em revistas brasileiras e trabalhos apresentados em congressos nacionais, replicaram-se as aplicações da Lei de Lotka à literatura brasileira em 10 campos diferentes. Utilizou-se o modelo do poder inverso pelos métodos do mínimo quadrado e probabilidade máxima.
openaire +3 more sources
Oikos, Volume 130, Issue 11, Page 2028-2039, November 2021., 2021 Phenotypic evolution in sympatric species can be strongly impacted by species interactions, either mutualistic or antagonistic. Heterospecific reproductive behaviours between sympatric species have been shown to favour phenotypic divergence of traits used as sexual cues. Those traits may also be involved in local adaptation or in other types of species
Grégoire Boussens‐Dumon +1 more
wiley +1 more source
Biodiversity as insurance: from concept to measurement and application
Biological Reviews, Volume 96, Issue 5, Page 2333-2354, October 2021., 2021 ABSTRACT Biological insurance theory predicts that, in a variable environment, aggregate ecosystem properties will vary less in more diverse communities because declines in the performance or abundance of some species or phenotypes will be offset, at least partly, by smoother declines or increases in others.
Michel Loreau +12 more
wiley +1 more source
Concentration in Lotka-Volterra parabolic or integral equations: a general convergence result [PDF]
, 2009 We study two equations of Lotka-Volterra type that describe the Darwinian evolution of a population density. In the first model a Laplace term represents the mutations. In the second one we model the mutations by an integral kernel. In both cases, we use
Barles, Guy +2 more
core +7 more sources
Diversity and Distributions, Volume 27, Issue 7, Page 1180-1193, July 2021., 2021 Abstract Aim High levels of nitrogen deposition have been responsible for important losses of plant species diversity. It is often assumed that reduction of ammonia and nitrogen oxide emissions will result in the recovery of the former biodiversity. In Western Europe, N deposition peaked between 1980 and 1988 and declined thereafter.
Frank Berendse +9 more
wiley +1 more source
AS ESTRATÉGIAS DE INTERNACIONALIZAÇÃO: UM ESTUDO BIBLIOMÉTRICO APLICANDO AS LEIS DE LOTKA, BRADFORD E ZIPF NA BASE SPELL NO PERÍODO DE 2008 A 2018 [PDF]
Revista de Administração, Contabilidade e Economia da Fundace, 2020 A pesquisa analisa as producoes cientificas na area de Negocios Internacionais sobre o tema estrategias de internacionalizacao na plataforma SPELL por meio da aplicabilidade de analises bibliometricas mediante as Leis de Lotka, Leis de Bradford e Lei de Zipf. O estudo teve como amostra 110 artigos publicados no periodo de 2008 a 2018.
Raul Gomes Pinheiro +1 more
openaire +1 more source
Populations of high‐value predators reflect the traits of their prey
Ecography, Volume 44, Issue 5, Page 690-702, May 2021., 2021 The extent to which prey traits combine to influence the abundance of predators is still poorly understood, particularly for mixed predators in sympatry and in aquatic ecosystems. In this study, we characterise prey use and distribution in iconic bird (grey wagtails and Eurasian dippers) and fish species (brown trout and Atlantic salmon) to assess ...
Cayetano Gutiérrez‐Cánovas +8 more
wiley +1 more source
Revista Española de Documentación Científica, 1991 Se presenta un estudio bibliométrico de la aportación española a las publicaciones circulantes en la comunidad médica internacional desde 1927 a 1932, a través del repertorio bibliográfico Quarterly Cumulative Index Medicus. Se recogen todos los trabajos
Isabel Pérez-Salinas
doaj +1 more source
Estudio métrico sobre la actividad investigadora usando el software libre R: el caso del sistema universitario gallego [PDF]
, 2017 [Resumen] Este trabajo representa una nueva alternativa para el estudio, clasificación y comparación de la producción científica de centros de investigación, utilizando las funciones de tratamiento de datos del paquete Citan del software estadístico R ...
Naya, Salvador +2 more
core +2 more sources
Uso de TIC y TAC en la educación superior:
Revista Complutense de Educación, 2022 INTRODUCCIÓN. El artículo analiza la producción científica sobre el uso de las tecnologías de la información y la comunicación (TIC) y las Tecnologías del aprendizaje y el conocimiento (TAC) para mejorar la innovación pedagógica y/o los procesos de ...
Jennifer Lorena Gómez Contreras +2 more
doaj +1 more source