{"title":"Étude stochastique de la répartition des neutrons dans un modérateur (deuxième communication)","authors":"Guy Louchard","doi":"10.3406/barb.1960.67928","DOIUrl":"https://doi.org/10.3406/barb.1960.67928","url":null,"abstract":"This note is the continuation of the note on page 227. \u0000 In § IV the distribution in energy is considered with the use of caracteristic functionals. In absence of fission, this method permits to get more easily previous results. Differential equations are obtained for the case of fission. The model is extended in § V to the energetico-spatial distribution.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122721942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quelques paramètres foliaires liés au bilan d'eau des strates ligneuses de trois types de forêts belges","authors":"Jacques R. De Sloover, J. Lebrun, T. Marynen","doi":"10.3406/barb.1965.65259","DOIUrl":"https://doi.org/10.3406/barb.1965.65259","url":null,"abstract":"Leaves samples were taken in three adjoining forest plots : an alluvial alder and ash wood, a ravine maple wood with North exposure and a boxtree grove on a dry and sunny slope oriented to the South. \u0000 The potential water content, the surface development and the grades of succulence and sclerophylly were measured. These parameters show clear differences between the three chosen sites and thus define synecological characteristics classifying principally the three forest communities in terms of the radiation balance of the biotopes. \u0000 The species common to two or three of the plots studied, very generally display a variation of the leaf parameters drawing the same conclusion and disclosing, in that respect, the specific adaptation ability to the environment.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122501921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur le genre linéaire des surfaces algébriques irrégulières (Première note)","authors":"Pól Burniat","doi":"10.3406/barb.1968.62061","DOIUrl":"https://doi.org/10.3406/barb.1968.62061","url":null,"abstract":"Dans cette première note, on amorce une étude de la population des triples de valeurs [formula] des genres [formula] sur l'ensemble des surfaces porteuses d'un faisceau de genre p ≥ 1 de courbes de genre π ≥ 2. \u0000 Pour π = 2, on obtient les triples suivants (non exclusifs) [formula] avec s ≥ 0 arbitraire.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122510515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur la classification des surfaces algébriques","authors":"Pól Burniat","doi":"10.3406/barb.1965.65222","DOIUrl":"https://doi.org/10.3406/barb.1965.65222","url":null,"abstract":"On construit des surfaces algébriques de genres P2 > 1, p(1) = 1, pa = -1, pg = p -1, p>1, porteuses d'un faisceau de genre p = pg + 1 de courbes elliptiques. L'existence de pareilles surfaces n'est pas admise dans la classification générale des surfaces algébriques proposée par Enriques.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122531779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur la constitution du Bassin Arctique et les caractéristiques du mouvement saisonnier du pôle","authors":"P. Melchior","doi":"10.3406/barb.1955.69271","DOIUrl":"https://doi.org/10.3406/barb.1955.69271","url":null,"abstract":"Des explorations récentes effectuées dans le Bassin Arctique ont établi l'existence de deux bassins indépendants, séparés par une chaîne de montagnes sous-marine alignée sur le méridien de 30° W ; celui-ci coïncide avec le grand axe de l'ellipse décrite par le pôle dans son mouvement forcé annuel.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122958347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Isomérie nucléaire du Se81. Analyse des rapports des sections efficaces de capture en fonction de l'énergie du neutron incident","authors":"P. Capron, E. Crèvecoeur","doi":"10.3406/barb.1954.69235","DOIUrl":"https://doi.org/10.3406/barb.1954.69235","url":null,"abstract":"L'étude du rapport des sections efficaces de capture du neutron par le sélénium 80 pour former les isomères sélénium 81 montre une grande variation en fonction de l'énergie des neutrons incidents. Des essais d'interprétation, basés sur la différence des spins du niveau complexe et des deux états isomériques ont été faits. Une période qui, normalement ne peut apparaître par la réaction (n, y), y est détectée.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114167508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur les surfaces contenant une involution non rationnelle de genres arithmétique et géométrique nuls","authors":"L. Godeaux","doi":"10.3406/barb.1966.62759","DOIUrl":"https://doi.org/10.3406/barb.1966.62759","url":null,"abstract":"Résumé. — Construction d'une surface possédant une seule courbe canonique et contenant une involution de genres Pa = Pg = 0, non rationnelle, sans faire d'hypothèse sur la surface image de cette involution. Les surfaces considérées ont comme système des sections hyperplanes le système tétracanonique.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114168441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Lazulite et Scorzalite de pegmatites du Congo Belge et du Ruanda","authors":"J. Thoreau, G. Bastien","doi":"10.3406/barb.1954.69095","DOIUrl":"https://doi.org/10.3406/barb.1954.69095","url":null,"abstract":"Des minéraux du groupe de la lazulite ont été trouvés dans diverses pegmatites du Congo Belge et du Ruanda. Parmi eux se trouvent représentés, d'une part, un terme magnésien (la lazulite proprement dite) et, d'autre part, un terme ferrifère (la scorzalite). L'analyse aux rayons X et l'analyse thermique différentielle ont fait apparaître, entre ces variétés, de légers écarts dans les dimensions réticulaires, mais des différences plus marquées dans les propriétés thermiques.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114503248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur le calcul des invariants d’une surface multiple ayant un nombre fini de points de diramation","authors":"L. Godeaux","doi":"10.3406/barb.1950.70339","DOIUrl":"https://doi.org/10.3406/barb.1950.70339","url":null,"abstract":"On considère une surface algébrique Φ image d’une involution d’ordre premier, cyclique, appartenant à une surface F et n'ayant qu’un nombre fini de points unis. Les relations entre le genre linéaire, l’invariant de Zeuthen-Segre et le genre arithmétique de F, et les invariants correspondants de Φ, dépendent de la structure des points unis de l’involution et de celle des points de diramation de Φ. On indique comment on peut établir ces relations en utilisant une méthode due à M. F. Severi.","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114579896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A note on some special G-Functions","authors":"Prem Chandra Consul","doi":"10.3406/barb.1966.62738","DOIUrl":"https://doi.org/10.3406/barb.1966.62738","url":null,"abstract":"","PeriodicalId":296277,"journal":{"name":"Bulletin de la Classe des sciences","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122065083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}