61,073 research outputs found
Research fronts in library and information science in Spain
No full textPublications and author cocitations in library and information science in Spain during the period from 1985 to 1994 were analyzed as a measure of the structure, specificity and composition of research fronts in this country. A cocitation matrix developed from an ad hoc database was subjected to cluster analysis, multidimensional scaling and principal components analysis, The resulting cocitation maps identified specific areas of r~search and their knowledge bases. We inferred the degree of consolidation of the discipline of library and information science, and of the subdisciplines informetrics, librarianship and university affiliation, from the research activities revealed. In this respect, the conclusions from the study show the existence of several research fronts in Spanish literature the contents of which are in most cases difficult to compare with those in other countries. A lesser degree of maturity of research in this field is shown
A Connectionist and Multivariate Approach to Science Maps: Som, Clustering and Mds Applied to Library & Information Science Research.
No full textThe visualization of scientific field structures is a classic of scientometric studies. This paper presents a domain analysis of the library and information science discipline based on author co-citation analysis (ACA) and journal cocitation analysis (JCA). The techniques used for map construction are the self-organizing map (SOM) neural
algorithm, Ward’s clustering method and multidimensional
scaling (MDS). The results of this study are compared with
similar research developed by Howard White and Katherine
McCain [1]. The methodologies used allow us to confirm that
the subject domains identified in this paper are, as well,
present in our study for the corresponding period. The appearance of studies pertaining to library science reveals
the relationship of this realm with information science.
Especially significant is the presence of the management on the journal maps. From a methodological standpoint, meanwhile, we would agree with those authors who consider
MDS, the SOM and clustering as complementary methods
that provide representations of the same reality from different analytical points of view. Even so, the MDS representation is the one offering greater possibilities for the structural representation of the clusters in a set of variables
Etica e formazione nell'era della nanotecnologie
No full textOggi più che mai la scienza e la tecnologia rappresentano un'icona
identitaria della civiltà occidentale, per la pervasività, prima di tutto pragmatica, poi anche simbolica della tecnologia, pertanto il nodo scienza-società è per sua natura epistemico. Tale nesso infatti ha a che vedere con i processi di costruzione, organizzazione e divulgazione della conoscenza; cosa che è anche un problema squisitamente educativo. In questo articolo si studiano le conseguenze etiche e formative di questo nesso epistemico nella contemporaneità
Nuove emergenze formative: tecnologia di ultima generazione e rischi globali.
No full textIl sapere – che si traduce nella capacità e nel potere di condizionare e di manipolare la realtà – è alla radice dei cambiamenti sociali, come emerge con chiarezza in questo nostro tempo, unico nella storia dell’umanità, proprio perché è caratterizzato dall’intervento umano persino nella conformazione più minuta della materia; cosa che sta portando a cambiamenti radicali del soggetto e della società. Ma, se la natura del rapporto scienza-società\sapere-potere, è relazionale e trasformativa, il suo rapporto con la verità è nei processi di costruzione di un sapere che è - esso stesso - storico ed evolutivo. Pertanto, come la scienza non può essere neutrale né perseguire verità assolute, così l’etica non può che essere un fenomeno processuale e sistemico. Di fatto, dato che la visione del mondo è, in gran parte l’esito di una costruzione che, nella comunità, riveste un ruolo identitario, la tecnoscienza agisce come una sorta di coscienza preliminare, presente in tutte le relazioni che intrecciamo con il nostro mondo.
La tecnologia disegna una geografia valoriale che deve essere decifrata, per potervisi orientare con competenza critica, ovvero, con cognizione di causa
Jesús F. Contreras, escultor finisecular: entre la patria chica, el nacionalismo y el cosmopolitismo
No full textFrom regional studies, based on the biographical method that seeks a new sociocultural assessment of the artist, this article describes and analyzes a series of hitherto unknown aspects of the Aguascalientes sculptor Jesús F. Contreras (1866-1902). Examining rarely explored documentary sources, as well as classic and recent bibliography on this character, in addition to hemerography (the written press published in Aguascalientes, Mexico City and
Paris at the end of the 19th century and beginning of the 20th century) and unpublished photographic images (from the photo album of the Contreras family), the article proposes a new vision from the local level, without losing sight of the national and international context, in the fluctuation between nationalism and the prevailing cosmopolitanism of the time. Its importance lies in the fact that it opens up new historiographic and research veins because,
among other things, it explains its wide network of family relationships and friendship.Desde los estudios regionales, con base en el método biográfico que busca una nueva valoración sociocultural del artista, este trabajo describe y analiza una serie de aspectos hasta ahora desconocidos del escultor aguascalentense Jesús F. Contreras (1866-1902). Abrevando en fuentes documentales escasamente exploradas, así como en bibliografía clásica y de reciente producción sobre el personaje, además de hemerografía (prensa escrita publicada en Aguascalientes, ciudad de México y París a finales del siglo xix y principios del xx) e imágenes fotográficas inéditas (procedentes del álbum fotográfico de la familia Contreras), el artículo propone una nueva visión desde lo local, sin perder de vista el contexto nacional e internacional, en un ir y venir entre el nacionalismo y el cosmopolitismo prevaleciente de la época. Su importancia radica en que abre nuevas vetas historiográficas y de investigación pues, entre otras cosas, da cuenta de su amplia red de relaciones familiares y de amistad
Jesús F. Contreras, escultor finisecular. Entre la patria chica, el nacionalismo y el cosmopolitismo
No full textDesde los estudios regionales, con base en el método biográfico que busca una nueva valoración sociocultural del artista, este trabajo describe y analiza una serie de aspectos hasta ahora desconocidos del escultor aguascalentense Jesús F. Contreras (1866-1902). Abrevando en fuentes documentales escasamente exploradas, así como en bibliografía clásica y de reciente producción sobre el personaje, además de hemerografía (prensa escrita publicada en Aguascalientes, ciudad de México y París a finales del siglo XIX y principios del XX) e imágenes fotográficas inéditas (procedentes del álbum fotográfico de la familia Contreras), el artículo propone una nueva visión desde lo local, sin perder de vista el contexto nacional e internacional, en un ir y venir entre el nacionalismo y el cosmopolitismo prevaleciente de la época. Su importancia radica en que abre nuevas vetas historiográficas y de investigación pues, entre otras cosas, da cuenta de su amplia red de relaciones familiares y de amistad
Estudo de uma fonte de alimentação trifásica, alto fator de potência, comutação suave, com um único estágio de processamento de potência
No full textA connectionist and multivariate approach to science maps: the SOM, clustering and MDS applied to library and information science research
No full textThe visualization of scientific field structures is a classic of scientometric studies. This paper presents a domain analysis of the library and information science discipline based on author co-citation analysis (ACA) and journal cocitation analysis (JCA). The techniques used for map construction are the self-organizing map (SOM) neural algorithm, Ward’s clustering method and multidimensional scaling (MDS). The results of this study are compared with similar research developed by Howard White and Katherine McCain [1]. The methodologies used allow us to confirm that the subject domains identified in this paper are, as well,
present in our study for the corresponding period. The appearance of studies pertaining to library science reveals the relationship of this realm with information science. Especially significant is the presence of the management on the journal maps. From a methodological standpoint, meanwhile, we would agree with those authors who consider MDS, the SOM and clustering as complementary methods that provide representations of the same reality from different analytical points of view. Even so, the MDS representation is the one offering greater possibilities for the structural representation of the clusters in a set of variables
FIGURE 1. Coulteria a-c in Coulteria lewisiae (Leguminosae: Caesalpinioideae) a new species for Infiernillo region, Mexico
No full textFIGURE 1. Coulteria a-c pollen grains different views (J.L. Contreras 3048); d male flower style; e male flower stigma close up (J.L. Contreras 2510); f female flower stigma; g female flower abaxial sepal (JL. Contreras 3155).Published as part of Sotuyo, Solange & Contreras-Jiménez, José Luis, 2021, Coulteria lewisiae (Leguminosae: Caesalpinioideae) a new species for Infiernillo region, Mexico, pp. 220-226 in Phytotaxa 498 (3) on page 221, DOI: 10.11646/phytotaxa.498.3.8, http://zenodo.org/record/542428
The incidence of potato virus-x, virus-y and virus-s in the chilota potato collection
No full textTheoduloz, C.; Saez Vasquez, J.; Poblete, F.
Contreras, A.;Hubert, E.;Meza-Basso, L. Programa de Biologia Vegetal, Facultad de Recursos Naturales, Universidad de Talca, Casilla 747. Talca, Chile
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