1,260 research outputs found
Tongiorgi Tomasi, Lucia (2021), Ritratti, libri, giardini. Sebastiano del Piombo, Fernando Colombo, Agostino Chigi. Firenze: Leo S. Olschki Editore. xx + 202 pp. [Reseña de libro]
No full textReseña de libro, Tongiorgi Tomasi, Lucia (2021), Ritratti, libri, giardini. Sebastiano del Piombo, Fernando Colombo, Agostino Chigi. Firenze: Leo S. Olschki Editore. xx + 202 pp. ISBN: 978-88-22267-68-9
Spatial augmented reality and simulations to improve abdominal aortic aneurysm diagnosis and monitoring
No full textIn this work we propose an approach based on IT tools to improve all the clinical activities related
to Abdominal Aortic Aneurism (AAA) detection and treatment. In particular, the approach is focused
on a 3D CAD model of the AAA and CFD simulations to improve diagnosis by evaluation of rupture
risk indicators and Spatial Augmented Reality (SAR) to simulate endovascular repair (EVAR) of the
pathology. Geometric model of the vascular wall is build from Computer Tomography (CT) data by
using and customizing algorithms and tools implemented in Vascular Modeling ToolKit (VMTK) software
library. Four methodologies of geometry initialization are compared and we choose those able to
describe the vascular disease excluding any foreign tissue (i.e., bones, internal organs, and muscles).
An evaluation of the problems connected to the relative parameters of reconstruction, their influence
for the correct geometry representation, focusing the attention on segmentation level and the smoothing
of the surface, are presented. In particular, we point out the effect of the smoothing by the use
of the Hausdorff distance. We propose a standardized process able to guide users in the modeling
of this type of vessels; moreover, SAR can dramatically improve the efficacy of AAA visualization for
some different clinical aspects. The 3D geometry of the AAA can be used to carry out CFD analysis, to
calculate parameters of the blood flow and evaluate the rupture risk indicator, like Oscillatory Shear
Index (OSI). The availability of risk indicators facilitates the physician in the diagnosis and prognosis.
Finally, we present a methodology and tools to simulate EVAR on a specific patient based on geometry
reconstruction and CFD simulations; this type of procedure can effectively improve training and
facilitate endovascular surgery
Root hair anatomy and morphology in Posidonia oceanica (L.) Delile and substratum typology: First observations of a spiral form
No full textThe morpho-anatomical root hair features of P. oceanica ramets collected in meadows settled on different substrata (sand, matte and rock) were analysed. On each substratum, nine plagiothropic rhizomes each one composed by 3–6 interconnected short shoots were collected between April and May 2016 at 10 m of depth. On sand and on rock, the adventitious roots showed two distinct tubular and spiral-shaped hairs, clustered in yellowish-gray gelatinous pads. Tubular root hair tips were dactiliform and generally attached to grains of rock fragments. Moreover, a sub-circular swelling zone occurred. On matte, root hairs did not form gelatinous pads, were very short and had a simple distal portion. The root hair anatomy and morphology described here provides new information on the P. oceanica root system that can express a remarkable root hair polymorphism
Orbit design for future SpaceChip swarm missions in a planetary atmosphere
No full textThe effect of solar radiation pressure and atmospheric drag on the orbital dynamics of satellites-on-a-chip (SpaceChips) is exploited to design equatorial long-lived orbits about the oblate Earth. The orbit energy gain due to asymmetric solar radiation pressure, considering the Earth's shadow, is used to balance the energy loss due to atmospheric drag. Future missions for a swarm of SpaceChips are proposed, where a number of small devices are released from a conventional spacecraft to perform spatially distributed measurements of the conditions in the ionosphere and exosphere. It is shown that the orbit lifetime can be extended and indeed selected through solar radiation pressure and the end-of-life re-entry of the swarm can be ensured, by exploiting atmospheric drag
Development of the hub port of Colombo, Sri Lanka
No full textThe Port of Colombo, Sri Lanka, is an important hub port in the Indian Ocean. A hub port is a port with mainly transhipment (and in this case container) throughput, which means that most of the cargo is not for the country itself, but for countries in the region. The yearly container throughput at the Port of Colombo reached its full capacity of 1.7 million TEU per year in 1997. Increasing waiting times for ships calling at the port are a result of this. Because of the costs of a waiting ship, shipping lines will choose other ports in the region such as Singapore, Salalah (Oman) or Dubai (United Arab Emirates) for their ships to go to. The aim of this study is to develop a plan for a New Container Terminal, which will give the Port of Colombo enough container throughput capacity for the next 25 years: till the year 2025.Hydraulic EngineeringCivil Engineering and Geoscience
Dissomphalus miriamae Colombo & Azevedo, sp. nov.
No full textDissomphalus miriamae Colombo & Azevedo, sp. nov. (Figs 12, 150, 151) Description. Male. Head and mesosoma black; metasoma dark castaneous or black. Mandible with two apical teeth; clypeus broadly projected forward, median tooth weakly rounded; frons weakly coriaceous and punctate. Mesosoma. Weakly coriaceous. T2 without tergal process. Posterior hypopygeal margin concave. Genitalia: paramere small in dorsal view, apex rounded, arched, smaller than basiparamere; cuspis wide; digitus wide; aedeagal ventral ramus smaller than dorsal body, apex ill defined, laminar, narrow; aedeagal dorsal body with one pair of apical lobes, inner pair with apex rounded in dorsal view, inner pair weakly serrate; basal process ill defined; apodeme extending beyond genital ring. Female unknown. Remarks. This species is allocated in amplus species-group by having the tergal process absent. This species not is similar other of species-group. This species is mainly different because has the aedeagal dorsal body with one pair of apical lobes and inner pair weakly serrate. Material examined. Types: Holotype Ƌ, BRAZIL, E[spírito] S[anto]: Santa Teresa, Est [ação] Biol [ógica] de Santa Lúcia, 28.III.2001, varredura, Azevedo & Kawada col. (UFES). Paratypes: 2Ƌ, Santa Teresa, Est [ação] Biol [ógica] de Santa Lúcia, 31.V.2001, 2♂, 27.IX.2001, varredura, Azevedo & Kawada col. (UFES); 1♂, Santa Maria de Jetibá, Fazenda Paulo Seick, 20º02’S 40º42’W, 29.XI–06.XII.2002, armadilha Malaise, Tavares & Azevedo e eq[uipe] col. (UFES); 1♂, Vitória, P [ar]q[ue] Est [adual] Fonte Grande, 30.VI.2001, varredura, Azevedo & Kawada col. (UFES). Etymology. The epithet miriamae is in allusion to the mother’s second author name Miriam. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on pages 41-42, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
Dissomphalus clovisi Colombo & Azevedo, sp. nov.
No full textDissomphalus clovisi Colombo & Azevedo, sp. nov. (Figs 9, 143, 144) Description. Male. Head and mesosoma black; metasoma dark castaneous or black. Mandible with two apical teeth; clypeus broadly projected forward, median tooth ill defined; frons weakly coriaceous, punctate. Pronotal disc coriaceous. T2 without tergal process. Posterior hypopygeal margin weakly concave. Genitalia: paramere wide in dorsal view, apex serrate, invagination serrate in ventral view, smaller than basiparamere; cuspis very wide; digitus sickle-shaped; aedeagal ventral ramus smaller than dorsal body, base narrow, wide middle part, apex narrow, laminar; aedeagal dorsal body with two pairs apical lobes, apex weakly bifurcated in dorsal view, inner pair weakly membranous; basal bar wide; apodeme extending beyond genital ring. Female unknown. Remarks. This species is allocated in amplus species-group by having the tergal process absent. This species not is similar other of species-group. This species is mainly different because has the aedeagal ventral ramus with wide middle part and apex narrow; aedeagal dorsal body with apex weakly bifurcated and aedeagal dorsal body with basal bar wide. Material examined. Types: Holotype Ƌ, BRAZIL, E[spírito] S[anto]: Santa Teresa, Est[ação] Biol[ógica] de Santa Lúcia, 26–29.VIII.2004, arm[adilha] Malaise, Tavares & equipe col. (UFES). Paratypes: 1Ƌ, Santa Maria de Jetibá, Fazenda Paulo Seick, 20º02’S 40º42’W, 06–13.XII.2002, armadilha Malaise, Tavares & Azevedo e eq[uipe] col. (UFES). Etymology. The epithet clovisi is in allusion to the father’s second author name Clovis. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on page 40, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
Correction to: Biaxial bending of SFRC slabs: Is conventional reinforcement necessary? (Materials and Structures, (2019), 52, 1, (1), 10.1617/s11527-018-1302-0)
No full textThe article ‘‘Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?’’, written by Marco di Prisco, Matteo Colombo and Ali Pourzarabi, was originally published electronically on the publisher’s Internet portal (currently SpringerLink) on 22 December 2018 without open access. The copyright of the article changed in December 2019 to The Author(s) 2019, and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made
Post-War Optimism in Colombo, Sri Lanka
No full textAfter twenty-six years of civil conflict, Sri Lankan government has geared towards rapid urban beautification after the bloody victory over the Tamil Tigers. Since 2009, Colombo changed beyond recognition: the high walls around public institutions have come down, the military checkpoints disappeared, streets are clearer and inhabitants enjoy the new freedom of going out and using public places. Within this new political situation, the people of Sri Lanka have less and less influence over their rapidly changing surroundings. The design proposal for an educational center has all the optimal circumstances to facilitate and trigger political participation.Design as PoliticsArchitectureArchitectur
Le specie aliene negli agro-ecosistemi : implicazioni pratiche ed aspetti ecologici
No full textAlien insect invasion has greatly increased in recent years in Italy on crops, forests, urban environments and even
natural ecosystems. Their accession-rate over about 60 years has increased from about 0.5-1 species/year in the
1950s –‘60s to about 7-8 species/year in the last two decades. Several of these alien species have become the primary
pests of cultivated plants either through direct or indirect damage, as vectors of plant diseases.Trade and tourist
activities are thought to mainly account for the majority of exotic pest accession, some of which may affect plants
in woodlands and natural ecosystems. Quarantine phytosanitary measures appear to not always be effective in preventing
the accidental introduction of alien species. Therefore, the risk of further accession remains consequently
very high
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