1,720,974 research outputs found
Quelques nouveaux documents sur Jean-Sylvain Bailly
No full textHahn Roger. Quelques nouveaux documents sur Jean-Sylvain Bailly. In: Revue d'histoire des sciences et de leurs applications, tome 8, n°4, 1955. pp. 338-353
Colladon de Genève, précurseur de Mendel
No full textHahn Roger. Colladon de Genève, précurseur de Mendel. In: Revue d'histoire des sciences et de leurs applications, tome 12, n°1, 1959. pp. 55-56
E. B. Smith, Jean-Sylvain Bailly, astronomer, mystic, revolutionary, 1736-1793
No full textHahn Roger. E. B. Smith, Jean-Sylvain Bailly, astronomer, mystic, revolutionary, 1736-1793 . In: Revue d'histoire des sciences et de leurs applications, tome 8, n°4, 1955. pp. 362-363
L'Académie royale des Sciences et la réforme de ses statuts en 1789
No full textHahn Roger. L'Académie royale des Sciences et la réforme de ses statuts en 1789. In: Revue d'histoire des sciences et de leurs applications, tome 18, n°1, 1965. pp. 15-28
Deux lettres de Laplace à Lavoisier.
No full textDuveen Denis, Hahn Roger. Deux lettres de Laplace à Lavoisier.. In: Revue d'histoire des sciences et de leurs applications, tome 11, n°4, 1958. pp. 337-342
Élite scientifique et démocratie politique dans la France révolutionnaire
No full textHahn Roger, Dobbs Anne. Élite scientifique et démocratie politique dans la France révolutionnaire. In: Dix-huitième Siècle, n°1, 1969. pp. 229-235
Sur les débuts de la carrière scientifique de Lacepède
No full textSUMMARY. — The text of four unpublished letters relevant to the career of the naturalist Lacepède (1756-1825) is given with a short commentary.RÉSUMÉ. — Cet article présente le texte de quatre lettres inédites touchant à la carrière du naturaliste Lacepède (1756-1825).Hahn Roger. Sur les débuts de la carrière scientifique de Lacepède. In: Revue d'histoire des sciences, tome 27, n°4, 1974. pp. 347-353
L'autobiographie de Lacepède retrouvée
No full textRoger Hahn : The autobiography of Lacepède.
In 1816 Buffon's desciple, B.G.E. de la Ville-sur-Illon, comte de Lacepède (1756-1825), prepared a lengthy autobiographical note for his cousin the Princess of Hesse-Philipsthal. The manuscript was recently located in Brussels and is printed with notes. It describes Lacepède 's noble background and youth in Agen ; cultural life in a provincial town ; his education, and musical, literary and scientific activities ; his meetings with Buffon, Daubenton, Gluck, Gossec, Franklin, Voltaire, Louis XVI, Marie-Antoinette and other notables ; his writings as a naturalist of the Jardin du Roi ; his political activities during the Revolution and under Napoleon ; his stewardship of the Légion d'Honneur ; and his conduct during the period 1814-1815.Hahn Roger. L'autobiographie de Lacepède retrouvée. In: Dix-huitième Siècle, n°7, 1975. pp. 49-85
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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