1,721,103 research outputs found
Himera. Osservazioni su un settore della città alta
No full textL’insediamento di Himera fu pianificato due volte: l’ultimo fu costruito a partire dagli anni
intorno al 570 a.C. Ebbe almeno due orientamenti, uno per la città sulla collina e uno per la
città bassa, sul plateau vicino alla costa. Gli studiosi hanno spesso evidenziato la regolarità e
l’ortogonalità delle sue strade che sembrano tracciare oikopeda, lotti di costruzioni private della
stessa dimensione.
Lo studio degli antichi resti in un’area di quattro oikopeda nel cosiddetto Quartiere
Meridionale consente di riesaminare la questione della regolarità degli spazi di edifici privati,
con la conclusione che ci furono oikopeda più grandi della misura standard già nel progetto di
pianificazione urbana.The settlement of Himera was planned two times: the last was built from the years around 570
BC. It has at least two orientations, for the city side on the hill and for the lowertown, on the
plateau close to the shore. The scholars have often remarked about regularity and orthogonality
of its streets that seem to draw oikopeda, parcels of private building, of the same size.
The study of the ancient remains in an area of four oikopeda in the so-called South Quarter allowed
to re-examine the question of the regularity of private building spaces, concluding that
t here were oikopeda larger than the standard already in the urban planning project
Performance Evaluation of a Novel Plasmonic Butterfly-type Nanoantenna: Optical and Far-field Properties
No full textIn this paper, the design of a novel butterfly-shape antenna (patent pending) over the 0.1-10 THz frequency range is proposed. The antenna consists of two simmetric gold arms with a lenght of 46.48 μm, a width of 22.40 μm, and a thickness of 200 nm gold separated by a gap of 20 nm. The two-layer substrate is composed of 3 μm of silicon and 50 nm of gold. Simulation results, carried out by CST Studio Suite 2023, show three different resonant frequencies at 2.1 THz, 3.6 THz, and 5.1 THz, respectively, with a -10 dB S 11 lower than -18 dB for each resonant frequency and a directivity up to 11.04 dBi. Starting from the design of a single butterfly-nanoantenna, a 2x2 array is simulated and fabricated
First records of the red swamp crayfish Procambarus clarkii (Girard, 1852) (Decapoda Cambaridae) from a small circum-Sardinian island (central Mediterranean Sea)
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Update Available: Comprehensive Tools For Comparative Anatomy Ver. 2.0.
No full text"UPDATE AVAILABLE: COMPREHENSIVE TOOLS FORCOMPARATIVE ANATOMY VER.2.0" F. Spani1, M. Carosi1, M. Scalici1, M.P. Morigi2,3,4, M. Bettuzzi2,3,4, M. Colasanti11 Department of Sciences, Roma Tre University, Rome;2Department of Physics and Astronomy, University of Bologna,Bologna; 3Museo Storico della Fisica e Centro Studi e Ricerche“Enrico Fermi”, Rome; 4Istituto Nazionale di Fisica NucleareRome, ItalyE-mail: [email protected] Treatises on comparative anatomy1,2are the evidence of howinvestigating anatomical structures have been crucial to betterknow living organisms and their interplay with the surroundingenvironment which could induce significant morphological varia-tion. Traditional anatomical dissections for exploring internalmorphology were not suitable to maintain integrity of samples.In the last few years, bio-imaging techniques paired with geomet-ric morphometrics (GM), and applied to comparative anatomystudies, overcame these limits becoming at the same time widelynon-invasive and highly descriptive. In fact, they preserved sam-ples in their whole integrity, unfolding new descriptors of formvariation previously unknown. The application field of these tech-niques ranged from 2- to 3-dimensional GM studies, coveringboth invertebrates and vertebrates. Radiological instrumentsbelonging to the family of Computed Tomography (CT) scannersdefinitively allowed to advance in the knowledge of either knownor neglected biological structures. Our implementations coveredseveral animal orders (e.g. Decapoda, Ephemeroptera Mytiloida,Macroscelidea, Primates). Here we focused on the feasibility ofthe cone-beam CT for 3D surface scanning of the mussel Mytilusgalloprovincialis(Lamarck, 1819) valves,3,4and the potential ofmicro-CT scanner in detecting and 3D characterizing virtual vol-umes of genital bones in primates (i.e., baculumin males andbaubellumin females).5These innovative practices help toengage and deepen the meaning of shape in animal biology, fromboth structural and evolutionary views. They allow to describethe relation between phylogeny and morphogenesis, identifyingall possible links between structure, function and fitness, andmechanical and ontogenetic modifications due to environmentalpressures, including anthropogenic alterations.1. Grandidier A. Histoire Physique, Naturelle et Politique de Madagascar1875, 6: 272-278.2. Hill PWC. Primates-Comparative Anatomy and Taxonomy 1953-1974,vols. 1-7.3. Scalici M et al. Ecotoxicology 2017, 26: 396-404.4. Scalici M et al. Aquat Living Resour 2016, 29: 207.5. Spani F et al. Folia Primatol 2017, 88: 200
Mediterranean temporary ponds: an example of neglected habitats from Latium (central Italy)
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Population structure and dynamics of two co-occurring invasive alien crayfish species in a small subalpine lake in Trentino: implications for invasive alien species management
No full textThe dataset from two eradication campaigns of two invasive crayfish species, Procambarus clarkiiand Faxonius limosus, co-occurring from 2023 in the ZSP “Lago Costa”, a small subalpine lake in Trentino, was analysed to estimate relevant life parameters, the population structure and growth dynamics, to assess the efficiency of the eradication and the effect of interspecific interactions. Trapping was conducted in 2023 and 2024; captures ofP. clarkii increased in 2024, while those of F. limosus decreased, likely due to competitive interactions with P. clarkii. The 2023 campaign showed the spatial expansion of P. clarkii from its likely introduction point; from 2023 to 2024 the great competitive ability of this species forced F. limosus towards refuge areas. The population of P. clarkii had a complex population structure, with 4-5 size classes, suggesting effective reproduction and annual recruitment of new generations. Captured males ofF. limosus males were distributed mainly in 2-3 size classes, females in 4-5 five classes. Longevity reached a maximum of 9.4 years for male P. clarkii (2023), and 8.6 for female F. limosus (2024); values were always higher than those recorded in the literature. The low Natural Mortality values suggest a substantial role of the mortality caused by the eradication campaigns: the NM was 14% for P. clarkii and 10% for F. limosus, the remaining 86% and 90% of the total mortality was due to trapping
A High-Efficiency Optical Energy Harvester based on a Low-Impedance Plasmonic Nanoantenna
No full textIn this paper, for the first time, an investigation in terms of efficiency of an energy harvester based on a plasmonic nanorectenna array is proposed. The novel proposed mirrored-arrowhead nanoantenna presents a very low impedance value at the resonant frequency which reduces the mismatching between the antenna and rectifier circuit. Simulation results carried out by the CST 2020 Studio show a resistance value equal to 1.1 kohms at about 350 THz and a very wide bandwidth as the equivalent RF rhombic antenna. This study paves the way to nanoantennas for high-efficiency electromagnetic energy harvesting applications overcoming the photovoltaic technology
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