Politecnio die Bari - Catalogo di prodotti della Ricerca
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Dual-gas quartz-enhanced photoacoustic spectroscopy sensor exploiting two fiber-combined interband cascade lasers
Full text linkIn this work, a novel indium fluoride glass 2-input-1-output fiber combiner was designed and fabricated to combine two Interband Cascade Laser (ICL) sources emitting in the mid-infrared wavelength range. To test the combiner performance, a dual-gas quartz-enhanced photoacoustic spectroscopy sensor was demonstrated for the detection of carbon dioxide (CO2) and nitric oxide (NO), employing two fiber-coupled ICLs having central emission wavelengths of 4,234 nm and 5,263 nm, respectively. The laser beams were coupled via the fiber combiner and then focused into a commercial acoustic detection module equipped with an input fiber-port, thus resulting in a plug-and-play sensing system. Tens of ppm-level detection limits at 3σ are achieved for both pollutants with a lock-in integration time (τ) of 0.1 s. Finally, an Allan-Werle analysis demonstrated the stability of the sensor, allowing the achievement of detection limit of 13 ppm and 4 ppm at τ = 10 s for CO2 and NO, respectively
New indicators for sustainable tourism and transport networks resilience: the case study of Bari (Italy)
Full text linkThe social, economic and cultural perception of cities is strongly influenced by the tourism sector. Assessing the level of cycling in cities is essential to promote sustainable tourism, and factors such as safe infrastructure or public transport services including bike sharing systems are crucial.
Micro-mobility, particularly cycling, plays a significant role in providing sustainable and efficient transport between accommodation and tourist attractions. The growing popularity of cycle tourism, driven by trends in experiential, slow and active tourism, highlights the need for awareness of public authorities and administrations in decision-making through quantitative and qualitative methods.
This study proposes: a collection of cyclability indicators for tourist accessibility, including multimodal public transport- bike systems, which can identify areas requiring infrastructure improvement; a survey of municipalities is presented that provides a snapshot of the current state of services and infrastructure in the region and can direct stakeholders to expand cycling services; a assessment of the resilience of urban road networks during major events, with a focus on the integration of micro-mobility.
The thesis concludes with a study that also assesses the sustainability of transport modes for tourism through Data Envelopment Analysis, providing municipalities with tools to improve urban infrastructures as exemplified in the case study of the city of Bari
What is the “best” way to measure the relative location variables in the market value assessment? An econometric method applied to an Italian case study
Full text linkThe present research is dedicated to investigating the explanatory power of relative location variables in assessing and forecasting market values. Here, relative location refers to the spatial position (geographical context) of a building or property in relation to a given Point Of Interest (POI). Specifically, a methodological approach is proposed for identifying the most suitable quantification modality based on statistical performance and consistency with the market mechanisms of the specific reference context. For a case study in Northern Italy, we collected data on 615 residential properties and 2673 POIs, including cultural facilities, school and education institutions, commercial services, sports, entertainment, and leisure facilities, health and care services, public transport systems, urban parks, and green areas. The relative location between the collected properties and the POIs is assessed using an automated calculation procedure developed in the Python programming language, in conjunction with Geographic Information Software (GIS). This automatism allows the assessment of relative location in terms of different Units Of Measure (UOM), such as straight-line distance, travel time by car, travel time on foot, travel time by public transport, and the number of POIs in a 400 m/1 km ring buffer. Since 615 residential buildings and 2673 POIs were analysed, with their relative locations measured using six different UOMs, a database of 9'865'215 data was produced. Furthermore, for each category of POI, a feature importance analysis guides the selection of the best UOM, i.e., the most statistically significant one. Considering the chosen UOM, an optimised econometric technique is finally implemented to analyse the functional relationships between the market values of residential properties and the set of identified relative location variables
Finite Element Analysis of Implant Stability Quotient (ISQ) and Bone Stresses for Implant Inclinations of 0°, 15°, and 20°
Full text linkThis study aimed to utilize finite element analysis (FEA) to evaluate the primary stability of Cyroth dental implants (AoN Implants Srl, Grisignano di Zocco, Italy) under various biomechanical conditions, including different implant inclinations (0°, 15°, and 20°) and bone densities (D3 and D4). By comparing these results with those obtained from in vitro tests on polyurethane blocks, the study sought to determine whether FEA could provide stability information more quickly and efficiently than in vitro methods. The research involved correlating dental implant micro-mobility with the implant stability quotient (ISQ) using FEA to simulate the mechanical behavior of implants and the surrounding bone tissue. Additionally, the study assessed the error in ISQ value detection by comparing FEA results with in vitro tests on polyurethane blocks conducted under the same experimental conditions. Both the FEA simulations and in vitro experiments demonstrated similar trends in ISQ values. For the D3 bone block simulated by FEA, the difference from the in vitro test was only 1.27%, while for the D2 bone, the difference was 2.86%. The findings also indicated that ISQ increases with implant inclination and that bone quality significantly affects primary stability, with ISQ decreasing as bone density diminishes. Overall, this study showed that ISQ evaluation for dental implants can be effectively performed through FEA, particularly by examining micro-movements. The results indicated that FEA and in vitro polyurethane testing yielded comparable outcomes, with FEA providing a faster and more cost-effective means of assessing ISQ across various clinical scenarios compared to in vitro testing
Non-Hydrostatic Galerkin Model with Weighted Average Pressure Profile
Full text linkThis work develops a novel two-dimensional, depth-integrated, non-hydrostatic model for wave propagation simulation using a weighted average non-hydrostatic pressure profile. The model is constructed by modifying an existing non-hydrostatic discontinuous/continuous Galerkin finite-element model with a linear, vertical, non-hydrostatic pressure profile. Using a weighted average linear/quadratic non-hydrostatic pressure profile has been shown to increase the performance of earlier models. The results suggest that implementing a weighted average non-hydrostatic pressure profile, in conjunction with a calculated or optimized Ө weight parameter, improves the dispersion characteristics of depth-integrated, non-hydrostatic models in shallow and intermediate water depths. A series of analytical solutions and data from previous laboratory experiments verify and validate the model
Su alcune chiese medievali inglobate in strutture fortificate. I casi di Trani, Bari e Monopoli in Puglia
No full textCastles often have devotional chapels or small churches for the garrison. These places of worship were
an integral part of the fortresses and fulfilled the important function of spiritually supporting those who
resided there. They could be small, adapted spaces or environments designed to fulfil sacred functions
already in the design phase. There are many examples of this, some of great value with frescoed walls,
quality architectural details and rich furnishings. This contribution aims to address a particular aspect of
the relationship between places of worship and fortified architecture. That is, the cases in which preexisting
churches and monasteries, due to subsequent defensive needs, are incorporated into the walls and
bastions of castles and forts, especially in the Renaissance period. Some cases present in Terra di Bari
have been examined in depth which, although presenting different situations and states of conservation,
are united by the loss of the original function to become an integral part of the fortified structures in which
they are incorporated. The remains of four medieval churches with a contracted cross plan with dome
were examined: two, dedicated to St. Anthony the Abbot, stood at the mouth of the ports of Trani and
Bari and were transformed into forts in the 16th century; a third, from the 11th century, also in Bari, was
incorporated into the bastion of Santa Scolastica on the extreme tip of the peninsula on which the ancient
city stands; the fourth was part of the monastic complex of San Nicola de Pinna and was absorbed by the
castle of Monopoli. The research involves the spatial re-proposition of the volume of the churches, their
relationship with the fortified environments that incorporate them and the changes to the urban layout
following these transformations
Energy resilience to climate change of the school building stock in the Mediterranean area. The case of Apulia Region
No full textThe climate crisis requires an increase in studies on the relationship between climate change and the built environment, since the construction field ranks among the most impactful sectors, while showing high vulnerability to climate change. Although the literature on the topic has been growing, it is still limited compared to the breadth of the problem, often restricted to specific building types. This book seeks to advance scientific knowledge by investigating a building typology that has been relatively underexplored in the literature. Indeed, the work aims to explore the energy resilience to climate change of school buildings in the Mediterranean area, starting from a typological and technological classification, continuing with a field study of the current energy status, and concluding with a predictive assessment of climate change resilience based on energy simulations run for representative buildings, while also exploring potential solutions. The analysis is focused on schools located in the Apulia Region, pursuing two main objectives. The former is to provide an overview of the current condition of Apulian schools, based on actual data. The results could assist local municipalities in understanding the actual conditions of this heritage, which is a fundamental basis for planning intervention programs.
The latter is to assess climate change impacts at the building level, with the aim of increasing the policymaker’s awareness of the challenges posed by changing climatic conditions, emphasizing the importance of carefully evaluating retrofit solutions
Gradient-Based Search Algorithm for Selective Harmonic Elimination in Cascaded H-Bridge Multilevel Converters
No full textThis article develops a gradient-based search algorithm for selective harmonic elimination (SHE) to
address the problems of high-computational cost, low convergence speed, modulation index error, and slow dynamic response often associated with SHE algorithms. First, the dimension of the search space is reduced by deriving intuitive equations to increase the search speed. Second, the desired modulation index is achieved by applying the proposed constraints. Third, gradient equations
are modified to move and hold points in the reduced search space. Extensive comparative simulation studies show that, compared to conventional SHE methods, the proposed algorithm is highly efficient in producing smooth switching angle curves with minimal fluctuations over the entire modulation index range. The proposed method minimizes execution time and modulation index error, even with unbalanced dc input voltages. These superior characteristics are also experimentally verified on cascaded H-bridge inverters with different number of stages up to 25
Understanding Landslide–Bridge Interactions Through a Comprehensive Analysis of a Global Case Study Database
No full textInfrastructures such as bridges and viaducts are exposed to numerous natural hazards that can compromise their safety and stability over time. Among these risks, interactions with landslides can pose significant threats, as landslides can introduce new loads onto the existing structure that were not accounted for in the original design. Landslides exert forces with a significant horizontal component that may impact the supports, piers, or directly on the bridge deck, leading to deformations and, in extreme cases, collapse. This work presents the development of a database containing 41 international case studies on interactions between landslides and bridges or viaducts. These events are classified according to key parameters such as landslide velocity, volume, and the type of interaction with the infrastructure. The analysis of the cases reveals recurring patterns in interaction and damage mechanisms, offering a deeper understanding of the most common conditions under which these interactions occur. The study’s findings highlight the importance of implementing preventive strategies and monitoring systems to mitigate the impact of landslides—whether slow-moving or rapid—on these infrastructures. Furthermore, the research underscores the need for more accurate risk assessment tools, considering that climate change may increase the frequency and severity of extreme weather events capable of triggering landslides