Politecnio die Bari - Catalogo di prodotti della Ricerca
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On the Influence of the SNR on the Optimization of Two-Satellite Systems with AOA Receivers
No full textTowards a Sustainable Seawater Desalination in Marine Protected Areas: Modelling and monitoring activity
No full textThis study presents numerical simulations on the downstream discharge of a desalination plant planned within a protected marina, in an area facing increasing demand for freshwater. The simulations assess potential impacts on the coastal marine ecosystem, supporting the design of environmentally sustainable solutions. The proposed plant adopts innovative techniques and a strategy aimed at minimizing ecological impact, ensuring a balance between local water needs and environmental protection. The numerical approach enables the analysis of different dispersion and mitigation scenarios, promoting the sustainable integration of the plant into the coastal setting. The results show that, although the response of biological communities is difficult to predict, the mixing of brines with existing freshwater discharge is expected to cause minimal salinity variations, lower than in the current situation, thus potentially limiting salinity-related effects on the marine ecosystem. Therefore, the project highlights the importance of green desalination solutions, based on renewable energy and efficient technologies, as a concrete response to water scarcity. This approach represents a sustainable management model that combines water security with marine ecosystem conservation
Standard Procedures Proposal of Laboratory Experimental Tests Assessment for Water Permeability of Anti-Rain Agricultural Nets
No full textClimate change threatens the agricultural field by affecting production yields and crop
quality. Yield protection is an increasingly pressing priority to preserve the ability of agriculture
to meet food demand with more sustainable production of appropriate quality and
quantity and with less demand for plant protection products. For this reason, nowadays
the use of agricultural nets is becoming increasingly widespread to counteract possible
risks from abiotic stresses. Among all agricultural nets, the anti-rain ones have the predominant
purpose of protecting crops from damage caused by severe weather events. The
present study aims to verify whether anti-rain nets could be used as greenhouse covering
material, starting from the evaluation of the rainwater permeability index Φrw. For this
purpose, a laboratory rain simulator was designed and several tests were performed on the
chosen anti-rain net, varying its inclination and the duration and intensity of the simulated
rainfall, returning different normalized permeability indices NPI, of which the standard
deviation (SD) was calculated. The optimal rainfall duration of the artificial rain test was
determined at the minimum value of the sum of the SDs, identified as about 25%, at a
duration of 10 min. Subsequently, tests were carried out to define the Φrw index for a
rainfall lasting 10 min, by varying the other parameters, returning the lowest Φrw index of
approximately 45% at a 20◦ net inclination and with the weave perpendicular to the slope.
The results highlight the possibility to use anti-rain nets for greenhouse covering, replacing
or supplementing commonly used nets, facilitating oxygen exchange and maximizing light
capture capacity, essential for vegetative–productive balance. A proposal for standardizing
the procedures to test nets, based on experimental tests, has never been proposed in the
scientific literature. Regarding fruit and vegetable crops, there are several issues to be
evaluated; this study only considers rain protection, through nets can be used for different
fruit and vegetable varieties
Segmentazione 2D e 2.5D del pancreas e dei tumori in immagini TC eterogenee di pazienti affetti da PDAC
No full textRecent Advances on Mid-Infrared Fiber Devices Based on Fluoride Glasses
No full textMid-infrared wavelength technology offers exciting opportunities for innovative photonic applications in medicine, telecommunications, material processing, environmental and chemical monitoring. The full development of optical fiber-based components is essential to enhance mid-infrared technology to the market level and to improve the flexibility of the related system. This will allow to eliminate bulky free-space optics, improving robustness and efficiency. Mid-infrared fiber lasers are crucial for these applications but remain in an early stage compared to mature silica-based fiber lasers, operating in the near-infrared. Significant progress has been made in the development of mid-infrared fiber components, including fiber couplers, fiber Bragg gratings and long-period gratings in fluoride glass, fluoride-to-fluoride and silica-to-fluoride splicing. Despite these advancements, further efforts are required to increase the technology readiness level and drive its commercialization. The aim of this manuscript is to review the recent breakthroughs and illustrate the remaining gaps/challenges in developing fiber-based mid-infrared technology
Experimental Evaluation of Anti-Rain Agricultural Nets: Structural Parameters and Functional Efficiency
No full textPlastic agrotextiles are increasingly used in modern agriculture to protect crops from
adverse climatic events, such as excessive rainfall, wind, and solar radiation. Among
these, anti-rain nets represent a promising solution to mitigate rain-induced disorders,
such as fruit cracking, especially in crops sensitive to water excess. This study investigates
the structural and functional properties of eight agrotextiles, including both anti-rain and
anti-insect nets. The analysis focuses on geometric characteristics (porosity, thread diameter,
mesh density) and on functional performance through experimental evaluation of air and
rainwater permeability under different slope conditions. Air permeability was assessed
using a wind tunnel, while rainwater permeability was tested via a rainfall simulation
bench. The results demonstrate a stronger correlation between the air permeability index
(Ka) and the rainwater permeability index Φrw (R2 = 0.95–0.99), across different net slopes
(10◦ and 30◦), than between the net porosity and Φrw (R2 = 0.86–0.92). These findings
emphasize the greater explanatory power of the dynamic performance indicator Ka as a
predictor of rainwater permeability, over purely geometric descriptors like porosity, since
it inherently accounts for the dynamic performance of the air flow through the net. This
contributes to the development of more effective and sustainable net-based crop protection
systems tailored to specific environmental and agronomic needs
Elena Guaccero. Il palazzo della Rai di Bari.
No full textIl volume indaga il ruolo delle donne nell’architettura, nel design e nell’urbanistica italiana dall'inizio del '900 a oggi. Attraverso i saggi, selezionati da un comitato scientifico multidisciplinare, emergono oltre cento protagoniste del progetto, attive in Italia e all’estero. Un lavoro corale che restituisce visibilità a percorsi individuali e collettivi rimasti a lungo ai margini della narrazione disciplinare, ma spesso centrali nella costruzione della cultura architettonica contemporanea.
L’articolazione del libro in ambiti tematici corrisponde alla pluralità dei ruoli assunti dalle donne nella cultura del progetto: dalle aule universitarie, dove le prime architette hanno intrecciato formazione, insegnamento e pratica professionale, al mondo dell’editoria specialistica e della curatela di mostre, in cui hanno orientato il dibattito e promosso nuove idee; dai percorsi internazionali di chi ha trovato riconoscimento oltre confine, all’impegno sul territorio, nella progettazione urbana, nella cura del paesaggio e nella tutela del patrimonio
Lithium Niobate Electro-Optic Phase Shifters for Reconfigurable Beam Steering
No full textAchieving accurate and reliable beam steering in optical phased arrays (OPAs) is strongly dependent on precision of the phase shifts applied between the unit radiators of the OPAs. In this work, we present the design of lithium niobate (LN) optical phase shifters required to drive optical phased arrays for beam steering in on-chip optical wireless switches. Two different configurations for these phase shifters are analyzed by exploiting the electro-optic effect of lithium niobate. In particular, an OPA-based 1×3 on-chip optical wireless switch is considered as a case study, in which a transmitter can address one of the three in-plane receivers through phase tuning. These phase shifts between the antenna elements of the OPA are driven by electro-optic phase shifters. We numerically evaluate the energy needed to induce the desired phase shifts, required for beam steering. Our simulation results show that the optical phase shifters based on the LN rib waveguide are more compact and energy efficient with respect to the ones based on LN strip waveguide. It is found that, in this configuration, the total energy required by the phase shifters to switch optical signals from one receiver to another in the wireless switch is 5.6 pJ