1,721,185 research outputs found
Le fortificazioni di Rutigliano: studio e ricostruzione tramite il rilievo digitale
Get PDFThe territory of Rutigliano (Bari), from a geomorphological point of view, is characterized by the presence of two “lame” (erosional valleys with seasonal torrent like flow): Giotta and San Giorgio, between which, in the early medieval period, a small settlement called Loco Rutigliano was estabilished. Although the existence of the settlement is traced back to the 10th century, the first certain reference is from 1059, the year in which, with a papal bull, a small, fortified village is mentioned. The village developed around a donjon (Torre Maestra), erected on a motte. This type of settlement, of North European origin, was introduced by the Normans, who are credited with the first fortifications of the village. The Torre Maestra became the central element from which urban development with a concentric layout radiated. From this central element, a trapezoidal enclosure was created, defining the perimeter of a small castle, which featured two additional towers at its remaining two corners, one likely identical to the Torre Maestra and a third tower, smaller and currently less visible. Surrounding this enclosure, a wall circuit was established, characterized by cylindrical towers and three city gates. Additionally, a postern with a drawbridge is documented as an entrance to the castle. Although studies on the reconstruction of the fortification system have already been initiated over the years, these studies are not sufficiently detailed. They are outdated and primarily based on archival research. This study aims to deepen these investigations using aerial and terrestrial photogrammetric survey methodologies, laser scanning, and 3D modeling, in order to provide new and more accurate elements for scientific reconstruction based on survey data alongside documentary evidence
Amarillo patito y verde botella: ¿Cómo estudiamos los colores de los animales?
Get PDF¿Alguna vez te preguntaste porqué los plumajes de algunas aves son extremadamente llamativos, porqué el camaleón cambia de color, o porqué los colibríes tienen plumas iridiscentes y algunos escarabajos colores metálicos? Los colores de los animales representan un tema que ha apasionado a biólogos y amantes de la naturaleza desde siempre. Pero el color es algo tan común en nuestras vidas que es difícil de entender que lo que vemos es, en realidad, una experiencia subjetiva atravesada por nuestra percepción. Es por esto que cuando realizamos estudios científicos de coloración necesitamos métodos apropiados que aseguren una medición objetiva y precisa. Los datos objetivos nos ayudan a desprendernos de esa subjetividad del observador.Fil: Naretto, Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Rossi, Nicola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; Argentin
Nonlinear signal–noise interactions in dispersion-managed links with various modulation formats
No full textPurpose of this paper is to highlight the principles of the nonlinear signal–noise interaction (NSNI) in dispersion-
managed long-haul optical links and provide a quantitative understanding of the system parameters
for which NSNI sets the nonlinear performance of the most popular intensity and phase modulation
formats, namely on–off keying, differential binary and quadrature phase-shift keying and coherent quadrature
phase-shift keying
Modeling of Signal-Noise Interactions in Nonlinear Fiber Transmission with Different Modulation Formats
No full textWe describe the physical principles behind nonlinear signal-noise interaction and its impact on dispersionmanaged
optical transmission system performance for both intensity and phase modulated signals
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Polarization Dependent Loss Impact on Coherent Optical Systems in Presence of Fiber Nonlinearity
No full textWe investigate the interaction of polarizationdependent
loss (PDL) with Kerr nonlinearities by decoupling
single- and cross-channel nonlinear distortions in a homogeneous
100-G polarization division multiplexing quadrature phase shift
keying (PDM-QPSK) and a hybrid 100-G PDM-QPSK/10-G
on/off keying system. Because of the decoupling method, we
provide reasons for the interaction, using basic comprehensive
examples. Both average Q-factor and its distribution are investigated
in both dispersion-managed and dispersion-unmanaged
links, showing that realistic PDL values affect outage probabilities
notwithstanding a negligible average penalty
Nonlinear Penalty Reduction Induced by PMD in 112 Gbit/s WDM PDM-QPSK Coherent Systems
No full textWe show by simulation that when linear PMD is fully compensated by the receiver, the presence of DGD
along the link reduces the amount of residual nonlinear penalty in 112 Gbit/s PDM-QPSK coherent systems
Nonlinear Threshold Decrease with Distance in 112 Gb/s PDM-QPSK Coherent Systems
No full textWe show that the accumulation rate of nonlinearity in NDM links can also be measured from the nonlinear threshold decrease rate, and provide simulations of such rates for each single- and cross-channel effect
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