326,019 research outputs found
A frequency averaging framework for the solution of complex dynamic systems
No full textA frequency averaging framework is proposed for the solution of complex linear dynamic systems. It is remarkable that, while the mid-frequency region is usually very challenging, a smooth transition from low- through mid- and high-frequency ranges is possible and all ranges can now be considered in a single framework. An interpretation of the frequency averaging in the time domain is presented and it is explained that the average may be evaluated very efficiently in terms of system solutions
Zero and root loci of disturbed spring-mass systems
No full textModels consisting of chains of particles that are coupled to their neighbours appear in many applications in physics or engineering, such as in the study of dynamics of mono-atomic and multi-atomic lattices, the resonances of crystals with impurities and the response of damaged bladed discs. Analytical properties of the dynamic responses of such disturbed chains of identical springs and masses are presented, including when damping is present. Several remarkable properties in the location of the resonances (poles) and anti-resonances (zeros) of the displacements in the frequency domain are presented and proved. In particular, it is shown that there exists an elliptical region in the frequency–disturbance magnitude plane from which zeros are excluded and the discrete values of the frequency and disturbance at which double poles occur are identified. A particular focus is on a local disturbance, such as when a spring or damper is modified at or between the first and last masses. It is demonstrated how, notably through normalization, the techniques and results of the paper apply to a broad category of more complex systems in physics, chemistry and engineering
La polarité occidentale d'Haradum, Moyen-Euphrate irakien (XVIIIe-XVIIe s. av. J.-C.)
No full textKepinski-Lecomte Christine. La polarité occidentale d'Haradum, Moyen-Euphrate irakien (XVIIIe-XVIIe s. av. J.-C.). In: Anatolia Antiqua, Tome 3, 1995. pp. 33-53
Socratina bemarivensis (Lecomte) Balle
No full textSocratina bemarivensis (Lecomte) Balle in Adansonia ser. 2, 4: 135. 1964. ÷ Loranthus bemarivensis Lecomte in Not. Syst. (Paris) 4: 37. 1923. ÷ Tapinanthus bemarivensis (Lecomte) Danser in Verh. Kon. Akad. Wetensch., Afd.Natuurk., sect. 2. 29: 108. 1933. Lectotypus (designed by BALLE, 1964b: 135): MADAGASCAR . Prov. Mahajanga: Bois de la Haute Bemarivo, [16°06’S 47°44’E], XI.1918, fl., Perrier de la Bâthie 10646 (P [P00573453]!; isolecto-: P [P0573454, P0573455]!). Conservation status. – With an EOO of 2,336 km ², and an AOO of 27 km ² and three subpopulations, none situated within the protected area network, S. bemarivensis is assigned a preliminary status of “Vulnerable” [VU B1ab(i)+2ab(i)] following IUCN Red List Categories and Criteria (IUCN, 2012). Notes. – Socratina bemarivensis was originally described in Loranthus Jacq. by LECOMTE (1923) following the very broad generic concept of ENGLER & KRAUSE (1935), a genus that is now circumscribed as mostly restricted to temperate or mountain forest from Europe to south-est Asia (BARLOW, 1997). Henri Perrier de la Bâthie, who collected both syntypes wrote on the label of one of them (Perrier de la Bâthie 10652), that the flowers open at maturity with only one longitudinal split along the entire length of the corolla lobes (see BALLE, 1964b: 137). Anthesis of S. bemarivensis is very different to that of Socratina keraudreniana where the corolla divides into five lobes in the distal part (Fig. 2). Several other characters of the morphology of its leaves and flowers allow to differentiate those two species: limb sub-orbicular to largely ovate, 0.8-4.8 cm in width in S. bemarivensis (vs. oblanceolate to obovate, 0.3-0.8 cm in S. keraudreniana); corolla broad, covered with long (2-2.5 mm) trichomes forming dense indument (vs. corolla slender covered by short (1-1.5 mm) trichomes forming a sparse indument) (Fig. 2). Perrier de la Bâthie noted several hosts for Socratina bemarivensis: Acacia sp. and Dalbergia sp. (Leguminosae), Eugenia sp. (Myrtaceae) and Vernonia sp. (Asteraceae) (BALLE, 1964b). Most Loranthaceae species seem to have a wide range of hosts (POLHILL & WIENS, 1998) but some species have also very restricted hosts such as Taxillus wiensii known only to grow on Cynometra webberi Baker f. (Leguminosae) (POLHILL & WIENS, 1998). Further studies are needed in Madagascar to determine if the genus Socratina has host specificity as this information is recorded on very few collections (see also comments under S. keraudreniana). Additional material examined. – MADAGASCAR . Prov.Antsiranana: Ambilobe, Ambakirano, Behefaka, Anjahana, forêt d’Ampivanana, 9 km au S de Behefaka, 13°21’12”S 49°09’11”E, 276 m, 6.V.2005, fl. & fr., Ratovoson 105 (CNARP, MO, P [P06714072], TAN). Prov. Mahajanga: Bord de l’Anovilava, affluent du Bemarivo (Boïna), [16°09’S 47°51’E], VI.1906, fl., Perrier de la Bâthie 10642 (P [P 05447659, P 05447668, P 05447669] [syntypes]!)Published as part of Callmander, M. W., I. Luino, S. Da-Giau, C. Rakotovao & L. Gautier, 2014, A synoptic revision of the Malagasy endemic genus Socratina Balle (Loranthaceae)., pp. 65-73 in Candollea 69 (1) on pages 66-68, DOI: 10.15553/c2014v691a7, http://zenodo.org/record/16113
Le poème en prose dans Applications de Marcel Lecomte
No full textLecomte et le poème en prose Marcel Lecomte constitue une figure emblématique mais complexe et, à certains égards, marginale des lettres belges : s’il compte parmi les fondateurs du surréalisme bruxellois, il en est rapidement écarté et ses positions et pratiques relatives à la littérature l’en distinguent. Sa poétique, qui fut caractérisée plus d’une fois dans ses lignes essentielles, mériterait une description globale et approfondie. Elle se signale par une écriture essentiellement fondée s..
Bataille de Lérida : 7 octobre 1642 / peint par Hipp. Lecomte ; gravé per S. Cholet.
No full textPossiblement, el gravat és una ompressió moderna d'un gravat del S.XIX, original del Museu del Louvr
Il ciclo di «Guiron le Courtois», romanzi in prosa del secolo XIII. Vol. I.: Roman de Meliadus. Parte prima, a cura di Luca Cadioli e Sophie Lecomte
No full textCon il titolo di Roman de Meliadus si indica la prima branche del Ciclo di Guiron le Courtois, mastodontico complesso di romanzi francesi in prosa composti all’incirca tra il 1235 e il 1240. Copiato nei secoli e amato da molte generazioni di lettori, tra cui Federico II di Svevia e Ludovico Ariosto (che vi trovò numerosi spunti per l’elaborazione dell’Orlando furioso), il Ciclo di Guiron le Courtois viene pubblicato integralmente per la prima volta a cura del «Gruppo Guiron». Il presente volume contiene l’edizione critica della prima parte del Roman de Meliadus (§ 1-410), dove fanno la loro comparsa sulla scena i protagonisti del romanzo: Esclabor, giovane cavaliere giunto a Roma come schiavo e liberato grazie al suo eroismo; re Artù, che da poco ha iniziato a governare sul regno di Logres; Meliadus, il padre di Tristano, che compie innumerevoli avventure in incognito, fino allo svelamento della propria identità; il Buon Cavaliere senza Paura, grande rivale di Meliadus, che con lui si contende il titolo di migliore dei cavalieri. E insieme a loro molti dei personaggi più noti dei romanzi arturiani, da Gauvain a Sagramor, ritratti agli albori della loro cavalleria, ancora inesperti e spesso sconfitti nei duelli in cui si lanciano con impeto giovanile. Le molteplici linee narrative che si dipanano in questa sezione convergeranno nell’immenso torneo del Pino del Gigante (edito nel secondo volume), grande episodio dalla forza centripeta che vede riuniti nello scontro tutti i personaggi del racconto. Il testo critico, costituito sulla base di uno stemma e di una nuova concezione del rapporto tra sostanza testuale e forma linguistica, è accompagnato da un apparato sistematico di varianti, da note di commento e da un glossario (pubblicato nel vol. 2). L’Introduzione presenta gli aspetti letterari salienti del romanzo e illustra le principali questioni relative ai manoscritti e alla trasmissione del testo
Diospyros fleuryana var. fleuryana A. Chev. ex Lecomte var. fleuryana
No full textDiospyros fleuryana A.Chev. ex Lecomte var. fleuryana Flore générale de l’Indo-Chine 3 (7): 948 (Lecomte 1930). TYPES. — Annam. Nhatrang Prov., Massif du Hon-Ba, 1000 m à 1500 m d’alt. (sommet) [= Vietnam. Khanh Hoa, the summit of Mt. Hon Ba, 1500 m alt.], 28-31.VIII.1918, Chevalier 38854 (lecto-, P, first-step designated byNguyen [1996: 66]; P [P00721602], Fig. 2, second-step designated here; isolecto-, E [E00934303]!; K [K000342277]!; P [P00721603, P00721604]!). NOTES Lecomte (1930: 948) only cited a Chevalier collection from “ Annam: S. massif de Hon-ba, alt. 1200–1500 m., en forêt” as the original material. Nguyen (1996: 66) cited Chevalier s.n. (P) as the holotype, effectively making a first-step lectotypification. We have located five sheets of Chevalier 38854 at E, K and P, collected from the cited locality, and annotated by Chevalier as “ Diospyros fleuryana A.Chev. ”. Three of them, K000342277, P00721602 andP00721604 are also annotated as “type” in Chevalier’s handwriting.The specimen P00721602, being in the best conditions, is chosen here as the lectotype.Published as part of Meeprom, Nattanon, Utteridge, Timothy, Culham, Alastair & Puglisi, Carmen, 2022, Lectotypification of Indochinese Ebenaceae published by P. H. Lecomte (1925 - 1930), pp. 1925-1930 in Adansonia (3) (3) 44 (12) on pages 121-122, DOI: 10.5252/adansonia2022v44a12, http://zenodo.org/record/648304
Vibration analysis of an ensemble of structures using an exact theory of stochastic linear systems
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