Higher Institute on Territorial Systems for Innovation
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NO-STRESS Manufacturing Study of work-related stress under different production conditions
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
From biomass to battery: lignin-derived carbons achieving unprecedented high capacity retention in potassium batteries
No full textThe increasing demand for sustainable energy storage solutions has led to a growing interest in post‐lithium-ion battery technologies. In this context, potassium-ion batteries (KIBs) have emerged as a promising alternative for large-scale applications due to the high natural abundance, cost-effectiveness, and favorable electrochemical properties of potassium. Hard carbon materials derived from biomass are particularly attractive as KIB anodes, offering a sustainable solution with appropriate structural and electrochemical behavior. This study investigates the electrochemical performance of hard carbons derived from lignin-rich biomass residues, which are chemically activated with different KOH ratios. Structural, morphological, and compositional analyses are conducted to elucidate the influence of activation parameters on porosity, chemical composition, graphitization degree, and interlayer spacing. Additionally, chemical composition and formation mechanism of the solid electrolyte interphase layer are in-depth analyzed. This work underscores the potential of biomass-derived hard carbons as sustainable anode materials for next-generation KIBs, aligning with circular economy principles and renewable energy storage strategies, and also targeting unprecedented electrochemical performances in terms of device durability
Calcium alginate hydrogel for high-yield adsorption-based desalination driven by ultralow-grade heat
No full textAdsorbent-based desalination stands out as a promising solution to produce fresh water leveraging on ultralow-grade heat. We investigate the use of a bio-derived calcium alginate (CaAlg) hydrogel, an alternative to other common sorbents. A batch of CaAlg is synthesized and characterized in a gravimetric sorption analyzer. The resulting type II isotherm at 30 degrees C shows an exceptional water uptake equilibrium value of 1.28 g/g at a relative humidity of 70%, realizing nearly a 4-fold increase compared to standard silica gels under the same conditions. We test CaAlg under vacuum in a water desalination unit. Our material shows an excellent medium-term cyclability, with a stable uptake over 40 cycles of operation. We achieve water production even at a temperature as low as 45 degrees Celsius, with a specific daily water production (SDWP) of 6 m3/day/ton using a hot-source temperature of 60 degrees Celsius, realizing the most performant small-scale system in the context of ultralow-grade waste heat valorization
A kernel-based approach to physics-informed nonlinear system identification
No full textThis paper presents a kernel-based framework for physics-informed nonlinear system identification that extends kernel-based techniques, accounting for unmodeled dynamics, to seamlessly embed partially known physics-based models, improving parameter estimation and overall model accuracy. The two models' components are identified from data simultaneously, thereby minimizing a suitable cost that balances the relative importance of the physical and the black-box parts of the model. Additionally, nonlinear state smoothing is employed to address scenarios involving state-space models with not-fully measurable states. Numerical simulations on an experimental benchmark system demonstrate the effectiveness of the proposed approach, achieving up to 51% reduction in simulation root mean square error compared to physics-only models and 31% performance improvement over state-of-the-art identification techniques
DM 352 - Study of sustainable materials and processes for energy transmission and storage devices
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Integrated Technologies for the Decommissioning of LWR Primary Systems: Cutting, Chemical Decontamination, and Conditioning of Spent Ion Exchange Resins
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Symmetric solutions of the n-body problem: A numerical study of Floquet multipliers and Morse indices
No full textthrough invariance under finite group actions. We focus on their stability properties and present algorithms
specifically designed for the computation of Floquet multipliers and Morse indices. Numerical results are
provided to illustrate our methods in both two and three dimensional configuration spaces, and for different
choices on the number of bodies
Production scraps to raw materials: low-cost method for implementing lithium iron phosphate cathode scraps back to production lines
No full textIn recent years, the increased production of lithium-ion batteries (LIBs) has been causing significant amounts of production scraps that require efficient, economical, and environmentally viable recycling methods. This study investigates strategies for integrating low-temperature direct recycling of lithium iron phosphate (LFP) production scraps into battery manufacturing. Scrap LFP cathode active material (CAM) was direct recycled at 200 °C in air and 400 °C in N2. The recycled CAM was blended in different amounts (100, 50, 30%-wt) with commercial CAM. Two slurry compositions were considered based on CAM: polyvinylidene fluoride: carbon black ratios (80:10:10 and 92:5:3), and coin cells were manufactured and tested. Results indicate that recycled CAM can be directly reprocessed in new batteries exhibiting excellent electrochemical performance (154 mAh g−1, equivalent to pristine material) when the slurry included 30%-wt CAM recycled at 200 °C in air and 100%-wt CAM recycled at 400 °C in N2. Compared to virgin slurry material cost (9.06 €/kgslurry) and environmental impact (8.27 kg CO2/kgslurry), incorporating 30%-wt CAM recycled at 200 °C in air reduced costs to 6.59 €/kgSlurry and emissions to 6.21 kgCO2/kgslurry, and 100%-wt CAM recycled at 400 °C in N2 corresponded to 3.77 €/kgSlurry and 2.45 kgCO2/kgslurry. These findings clearly demonstrate that closed-loop integration of low-temperature direct recycling of LFP cathode scraps into cell manufacturing reduces material costs and environmental impact while maintaining high electrochemical performance
An Improved Experimental Validation of Nonlinear Forced Response Simulation of Shrouded Blades
No full textFriction damping devices like tip shrouds are usually employed in low pressure turbine (LPT) blades to reduce their large vibration amplitudes. From an engineering point of view, experimental validation of the numerically predicted dynamic behavior of the blade is essential to demonstrate the damping performance of shrouds in LPTs. In accordance with this purpose, this study presents the comparison of experimental and numerical results for the detailed investigation of the dynamic behavior of shrouded turbine blades. A brief overview of the experimental test rig, which has been previously developed to measure both the nonlinear forced response and contact forces simultaneously, is first presented. The experimental results show the effect of different normal preloads and excitation force levels on the measured parameters. To compute the nonlinear forced response of the blade and the shroud contact forces, the test rig is modeled in a commercial finite element (FE) software, and the system matrices are extracted in a reduced order form. The harmonic balance method (HBM) is applied in a nonlinear solver developed dedicatedly with the implementation of a 3D contact model. The comparison of the experimental and numerical results is presented in particular cases where lower normal preload to excitation force ratio results in alternate stick and slip transitions. The results show that experimental dynamic behavior of shrouded blade is computationally captured in most of the cases. The nonmatching results are also highlighted for some cases in which the nonunique contact forces introduce the response variability. For these cases, response boundaries are numerically estimated by utilizing an optimization algorithm. The outcomes of this paper consequently exhibit a detailed validation procedure for the simulation tools and an understanding of the numerical concerns like convergence