102,406 research outputs found
Subsiste-t'il des représentants vivants des séries animales fossiles ?
No full textPoncelet M.-G. Subsiste-t'il des représentants vivants des séries animales fossiles ?. In: Bulletin de la Société préhistorique de France, tome 33, n°9, 1936. pp. 502-515
Geometry of syzygies via Poncelet varieties
No full textConsideriamo la Grassmanniana dei of -sottospazi lineari di
V_n=H^0({\P^1},\O_{\P^1}(n)). Definiamo la varietà
classificante i sistemi lineari di dimensione
e grado su le cui basi verificano un fissato numero di relazioni polinomiali di dato grado, ovvero un fissato numero di sizigie di dato grado. Nel presente lavoro calcoliamo la dimensione di .
Inoltre, studiamo il link tra le varietà di Poncelet.
In particolare, mostriamo che l'esistenza di sizigie lineari implica l'esistenza di singolarità sulle varietà di Poncelet.We consider the Grassmannian of -dimensional linear
subspaces of
V_n=H^0({\P^1},\O_{\P^1}(n)). We define
as the classifying space of the
-dimensional linear systems of degree on whose
basis realize a fixed number of polynomial relations of fixed
degree, say a fixed number of syzygies of a certain degree.
The first result of this paper is the computation of the dimension of .
In the second part we make a link between and the Poncelet varieties.
In particular, we prove that the existence of linear syzygies
implies the existence of singularities on the Poncelet varieties
Geometry of syzygies via Poncelet varieties
No full textACLInternational audienceWe consider the Grassmannian of -dimensional linear subspaces of . We define as the classifying space of the -dimensional linear systems of degree on whose basis realize a fixed number of polynomial relations of fixed degree, say a fixed number of syzygies of a certain degree. The first result of this paper is the computation of the dimension of . In the second part we make a link between and the Poncelet varieties. In particular, we prove that the existence of linear syzygies implies the existence of singularities on the Poncelet varieties
E. Poncelet, M. Yans, G. Hansotte, Coutumes de la Principauté de Stavelot, tome Ier, Les records de coutumes du pays de Stavelot. Publications de la Commission royale des anciennes lois et ordonnances de Belgique, 1958
No full textPlatelle Henri. E. Poncelet, M. Yans, G. Hansotte, Coutumes de la Principauté de Stavelot, tome Ier, Les records de coutumes du pays de Stavelot. Publications de la Commission royale des anciennes lois et ordonnances de Belgique, 1958. In: Revue du Nord, tome 44, n°173, Janvier-mars 1962. pp. 156-157
Etat du film d'eau adsorbé par des montmorillonites. Application de la thermodynamique statistique à l'étude des phénomènes d'adsorption
No full textApplication of statistical mechanics to physical adsorption processes sometimes allows to ascertain the nature of the adsorbed film and therefore the nature of the surface. A study of the state equations, carried out for the case of Na and Ca montmorillonites, seems to prove the existence of two types of "sites".
The first type appears to be sites for localized adsorption of water, and may correspond to the region surrounding the cations which balance the lattice charges (1st hydration sphere of these cations) as well as to a part of the external surface (hydroxylic areas of fracture).
The second type, consisting of sites for delocalized adsorption, is represented by the remainder of the external surface and the interlamellar space ; the first type of sites covers an area of about 300 m2 g-1, whatever the nature of the cation.L'application de la mécanique statistique aux phénomènes d' adsorption physique permet dans certains cas de préciser la nature du film adsorbé et par voie de conséquence la nature de la surface. L'étude des équations d'état effectuée dans le cas des montmorillonites Na et Ca semble prouver l'existence de deux types de "sites" d'adsorption.
Le premier type serait le siège d'une adsorption localisée de l'eau et pourrait correspondre au domaine entourant les cations compensateurs des charges du réseau (1ère sphère d'hydratation de ces cations) ainsi qu'une partie de la surface externe (surfaces de fracture hydroxyliques).
Le deuxième type, siège d'une adsorption délocalisée est représenté par le reste de la surface externe et de l'espace interlamellaire ; le premier type de sites couvre une surface d'environ 300 m2g-1 indépendamment de la nature du cation.Jelli André, Poncelet G. Etat du film d'eau adsorbé par des montmorillonites. Application de la thermodynamique statistique à l'étude des phénomènes d'adsorption. In: Bulletin du Groupe français des argiles. Tome 17, nouvelle série n°12, 1966. pp. 39-51
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Recommended from our members
3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
Protons de constitution, protons libres et eau adsorbée
No full textCalvet R., Chaussidon Jean, Cloos P., de Kimpe C., Fripiat José Jean, Gastuche Marie-Claire, Helsen J., Jelli André, Léonard A., Poncelet G., Uytterhoeven J. Protons de constitution, protons libres et eau adsorbée. In: Bulletin du Groupe français des argiles. Tome 14, nouvelle série n°9, 1964. pp. 59-98
- …
