199,344 research outputs found
Author Correction: Coronavirus disease 2019 (COVID-19) in Italy: features on chest computed tomography using a structured report system (Scientific Reports, (2020), 10, 1, (17236), 10.1038/s41598-020-73788-5)
No full textThe original version of this Article contained errors in the spelling of the authors Roberto Grassi, Roberta Fusco, Maria Paola Belfiore, Alessandro Montanelli, Gianluigi Patelli, Fabrizio Urraro, Antonella Petrillo, Vincenza Granata, Palmino Sacco, Maria Antonietta Mazzei, Beatrice Feragalli, Alfonso Reginelli & Salvatore Cappabianca which were incorrectly given as Grassi Roberto, Fusco Roberta, Belfiore Maria Paola, Montanelli Alessandro, Patelli Gianluigi, Urraro Fabrizio, Petrillo Antonella, Granata Vincenza, Sacco Palmino, Mazzei Maria Antonietta, Feragalli Beatrice, Reginelli Alfonso & Cappabianca Salvatore. These errors have now been corrected in the PDF and HTML versions of the Article
Serviceability and Ultimate Safety Checks of Segmental Concrete Bridges through N-M and M-V Interaction Domains
No full textIn current engineering practice, safety checks on serviceability and determinations of ultimate limit states of segmental bridges built by cantilevering are generally performed, either considering separately the contributions of axial force N, bending moment M, and shear force V, or considering the interaction effects through approximate expressions supplied by building codes. During construction stages and service life, the interaction between internal forces can be of fundamental importance in establishing the actual degree of structural safety and, for this reason, a different philosophy for performing checks in segmental bridges is proposed in this paper, plotting N-M and M-V interaction domains for cracking, construction stages, and serviceability (elastic domains) as well as M-V interaction domains for ultimate limit states (failure domains). Delayed deformations as a result of creep are considered, as are bonded and unbonded prestressing. A model is developed for plotting bending-shear domains at the ultimate limit state, underlining the strength reduction that occurs in concrete sections with external prestressing versus beams with full internal prestressing. A numerical application on an actual segmental bridge built by cantilevering was performed to show the proposed methodology, based entirely on strength domains, for safety checks. The load and stress paths in the construction stages are highlighted by considering the effects of creep in concrete, whereas bending-shear interaction is evaluated in the two cases of fully bonded prestressing and partially unbonded prestressing. The results show that safety checks which are performed based on approximate assumptions and expressions that do not explicitly consider the interaction effects can lead to unsafe evaluations, and it also shows that the proposed methodology allows engineers to take into account simultaneously any aspect related to cross-sectional strength on serviceability and ultimate limit states
Granata sulcifera Lamarck 1822
No full textGranata sulcifera (Lamarck, 1822) Stomatella sulcifera Lamarck, 1822 a: 210, no. 3. Kilburn & Rippey, 1982: 42, pl. 9, fig. 5. Type loc.: ‘les mers de la Nouvelle- Hollande’ [the seas of Australia]; holotype in MHNG, figured by Mermod & Binder (1963: fig. 206) and Poppe et al. (2006: fig. 26). Granata sulcifera —Steyn & Lussi, 1998: 24, fig. 79. Herbert, 2012: 484, figs 4 C, 6 D, 65–67 (detailed synonymy and chresonymy). Distribution. Indo-West Pacific to the eastern seaboard of Africa, extending south to southern Transkei (Coffee Bay); living LST and shallow subtidal down to 18 m. Herpetopoma Pilsbry, 1890. Type species (o.d.): Euchelus scabriusculus A. Adams & Angas, 1867.Published as part of Herbert, David G., 2015, An annotated catalogue and bibliography of the taxonomy, synonymy and distribution of the Recent Vetigastropoda of South Africa (Mollusca), pp. 1-98 in Zootaxa 4049 (1) on page 32, DOI: 10.11646/zootaxa.4049.1.1, http://zenodo.org/record/24536
Cirsonella romettensis Granata-Grillo 1877
No full textCirsonella romettensis (Granata-Grillo, 1877) Fig. 12 e–g Oxystele romettensis Granata-Grillo, 1877 (p. 7). Tharsis romettensis Seguenza—Jeffreys 1883 [b] (p. 93, pl. 19, fig. 7). Cirsonella romettensis (Granata, 1877) —Warén 1991[a] (p. 160, figs. 4C, 9E, 11C–E, 12A). Cirsonella romettensis (Seguenza G., 1873) — Giannuzzi-Savelli et al. 1994 (p. 106, fig. 350); Repetto et al. 2005 (p. 91, top right fig.). Cirsonella romettensis (Granata-Grillo, 1877) — Beck et al. 2006 (p. 48, mid fig.). Diagnostic characters. Globose-conoidal shell; moderately low spire; circular and slightly prosocline aperture; thick parietal callus often closing the umbilical chink; smooth and glossy outer surface. Protoconch: very low conical; 1.25 whorls; diameter about 260 µm; surface finely granulated; transition to the teleoconch marked by a thin, slightly everted lip. Occurrence. Core BC67 (1 specimen). Height: 2 mm. Distribution and habitat. Cirsonella romettensis is a NE Atlantic (as far South as the Azores) and Mediterranean species; it is a stenobathic element living on small hard substrates in the 100–1000 m depth interval, being commonly recovered from present-day Gryphus vitreus bottoms (Dautzenberg 1889; Corselli & Bernocchi 1988; Warén 1991[a]). It was regarded as an element of CB (deep-sea white corals) biocoenosis (Di Geronimo et al. 1982). Fossil record. Pliocene and Pleistocene of Italy (Warén 1991[a]; Di Geronimo & La Perna 1997; Di Geronimo et al. 1997; Di Geronimo et al. 1982; Di Geronimo et al. 2005).Published as part of Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), pp. 1-97 in Zootaxa 4186 (1) on page 54, DOI: 10.11646/zootaxa.4186.1.1, http://zenodo.org/record/16528
Casa
No full textPovertà, inflazione, lavoro povero, disuguaglianze, transizione ecologica e digitale, crisi demografica. Nuovi equilibri e disequilibri globali. Il ricorso alle guerre, i nuovi imperialismi e l’indebolirsi di qualsiasi autorità sovranazionale «terza» in grado di comporre i conflitti. Anche se le opportunità continuano a crescere, il mondo è oggi più debole di fronte alle questioni che lo attraversano. Con il rischio di avvitarsi in una spirale che lo conduce da una crisi all’altra.
La crisi della democrazia del nostro paese – che è simile a quella che si riscontra anche altrove – nasce dalla crescente incapacità dei partiti di stabilire contatti vitali con ciò che si realizza – nel bene e nel male – nel tessuto della società. Per questo serve una nuova rappresentanza sociale e politica, che renda quotidiano il rapporto tra queste due sfere su tutte le sfide globali e del territorio. L’impegno civico e sociale rimane ancora oggi il terreno più fertile per la rigenerazione di quel senso di cittadinanza senza il quale le democrazie si indeboliscono
La Camera del Lavoro di Monza dalle origini ai giorni nostri : tra "rivoluzione" e fascismo (1919-1925)
No full textAmaurodera granata ASSING 2003
No full textAmaurodera granataASSING, 2003 Material examined: Nepal: 1 ex., Khandbari District, Induwa Khola valley, 2850 m, 15.IV.1984, leg. Smetana & Löbl (MHNG). Comment: Amaurodera granata has been recorded from Sankhua Saba, Khandbari, and Solukhumbu Districts in East Nepal (ASSING 2003, 2005d).Published as part of Assing, Volker, 2015, New species and additional records of Lomechusini from the Palaearctic region, primarily from China (Coleoptera: Staphylinidae: Aleocharinae), pp. 243-262 in Beiträge Zur Entomologie = Contributions to Entomology 65 (2) on page 259, DOI: 10.21248/contrib.entomol.65.2.243-262, http://zenodo.org/record/588710
Bending-Shear Interaction Domains for Externally Prestressed Concrete Girders
No full textIn prestressed concrete structures, the evaluation of the safety level is generally carried out by separating the bending moment strength and the shear force capacity. Actually interaction between bending moment (M) and shear force (V) can have significant consequences on evaluations in service life, especially when the ultimate limit state (ULS) is considered. In this paper, the M-V interaction is addressed for prestressed concrete girders, in the cases of both bonded and unbonded prestressing tendons. It can be demonstrated, by drawing the interaction domains (M-V), that a significant reduction of the safety level has to be considered when shear force is evaluated together with bending moment on the ULS of the cross-section, especially for external prestressing in concrete T-shaped or box sections of bridge girders. Interaction domains allow designers to evaluate and optimize reinforcement ratios, geometric properties of the beam, and effects of shear on the ultimate state. An analytical model, based on the stress field theory, is developed and proposed in this paper. A numerical example is developed and interaction domains are given for an example of a box section with variation in reinforcement ratio and tendon slope. A validation of the presented model is given, by comparing experimental data in the literature with results found using the proposed analytical approach
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