1,721,209 research outputs found
Accardo A., Journalistes précaires
No full textBaisnée O. Accardo A., Journalistes précaires. In: Politix, vol. 13, n°50, Deuxième trimestre 2000. Sport et politique, sous la direction de Cyril Lemieux et Patrick Mignon. pp. 165-168
Oltre la parentesi: fascismo e storia d'Italia nell'interpretazione gramsciana
No full textil saggio scolge una riflessione sui termini entro i quali gramsci analizza il fascism
Modeling of glycogen resynthesis according to insulin concentration: Towards a system for prevention of late-onset exercise-induced hypoglycemia in Type 1 diabetes patients
Full text linkOne of the major barriers for physical activity in type 1 diabetes (T1D) patients is the risk of exercise-induced hypoglycemia, in particular the late-onset one. The identification of the relation between glycogen resynthesis rate after an exercise and insulin concentration would allow the development of new predictive models. The aim of the present work was thus to investigate this relation in T1D patients. We recruited 8 T1D subjects which underwent two 24-h observational experimental sessions: complete rest and a 3-hours treadmill walk. Glucose and insulin concentrations were measured throughout the two sessions. Comparing the data collected in the two sessions, the net glucose uptake was calculated; positive values were suggestive of glycogen repletion while negative values suggested liver glycogen breakdown. A significant correlation (r=0.742, p<0.001) was observed between insulin concentration and net glucose uptake, with the negative values corresponding to time periods showing the lowest insulin concentrations. In conclusion, the present study preliminarily assessed the impact of insulin concentration on the risk of late onset hypoglycemia, which is the first step towards a comprehensive and personalized system for prevention of exercise-induced hypoglycemia in Type 1 diabetes patients
Fmoc-diphenylalanine as a suitable building block for the preparation of hybrid materials and their potential applications
No full textDue to its capability to self-assemble in self-supporting hydrogels (HG) under physiological conditions, Fmoc-FF is one of the most studied ultra-short peptide. The structural properties of the resulting hydrogel (mechanical rigidity, entanglement of the fibrillary network, and the thickness of the fibers) strictly depend on the experimental conditions used during the preparation. In the past few years, a broad range of applications in different fields, such as biomedical and industrial fields, have been proposed. However, the research on novel materials with enhanced mechanical properties, stability, and biocompatibility has brought about the development of novel Fmoc-FF-based hybrid systems, in which the ultra-short hydrogelator is combined with others entities such as polysaccharides, polymers, peptides, or organic molecules. The structural features and the potential applications of these novel hybrid materials, with particular attention to tissue engineering, drug delivery, and catalysis, are described here. The aim is to give the readers a tool to design new hybrid nanomaterials based on the Fmoc-FF dipeptide hydrogelator, with appropriate properties for specific applications
A Study on the Cradle-to-Gate Environmental Impacts of Automotive Lithium-ion Batteries
No full textSeveral factors are influencing the spread of Electric Vehicles (EVs) in the automotive market. However, while battery-electric vehicles emit no tailpipe emissions, the manufacturing phase, particularly the manufacturing of the battery packs, can have significant environmental impacts. In addition, as the EV market expands, there will be a significant increase in demand for critical materials used in lithium-ion batteries, such as lithium, cobalt, and nickel. These materials are essential for producing high-performance batteries, and their global demand is expected to rise rapidly to meet the demands of the expanding market. This paper investigates the main challenges that need to be tackled to reach a sustainable path in the battery industry. A cradle-to-gate boundary is set to focus on raw material extraction, production of precursors, cell and module production, and battery pack assembly. In addition, because 7.8 million tons of EV batteries per year are expected to reach the end-of-life phase by 2040, a brief overview of the recycling issue is provided to investigate the potential usage of recycled material in the early stages of battery production
LCA of Recycled (NdDy)FeB Permanent Magnets through Hydrogen Decrepitation
Full text linkCompared to conventional fossil-fueled vehicles, electric vehicles offer several environmental benefits. However, even electric vehicles are not completely environmentally friendly because many of their parts are not recycled today. These parts, especially the magnets that power them, end up in landfills at the end of the vehicle's life cycle. This study aims to evaluate the environmental impacts of recycled (NdDy)FeB permanent magnets obtained by means of a novel hydrogen-decrepitation-based, magnet-to-magnet recycling technique. The Life Cycle Assessment methodology was used to compare, on a like-to-like basis, recycled and virgin permanent magnets. The core data provided by an industry partner served as the foundation for modelling the recycling process. Three different functional units were investigated based on three parameters, namely the magnet mass, magnetization coercivity, and energy product. Results revealed that the recycled magnet outperformed the virgin magnet in most impact categories. In terms of carbon footprint, recycling permanent magnets through hydrogen decrepitation would allow for an 1833% reduction with respect to their production from virgin materials, depending on the assumed functional unit
Life Cycle Analysis of a PEM Fuel Cell System for Long-Haul Heavy-Duty Trucks
No full textThe European Union plans to reach net-zero greenhouse gas (GHG) emissions in 2050. In 2020, the transport sector significantly contributed to global energy-related GHG emissions, with heavy-duty vehicles (HDVs) responsible for a substantial portion of road transport emissions in the EU and a notable percentage of the EU's total GHG emissions. Zero-emission vehicles (ZEVs), including fuel cell (FC) vehicles, are crucial for decarbonizing the transport sector to achieve climate neutrality. This paper aims at quantifying the environmental impacts of a 200kW proton exchange membrane FC system for long-haul HDVs with a 40-ton mass and 750 km driving range. The life cycle assessment (LCA) methodology was applied, and a life cycle model of the FC system was developed with a cradle-to-grave boundary. To ensure reproducibility and scalability, results are reported on a kW basis. A sensitivity analysis was performed on key parameters, including hydrogen production route, FC system production location, fuel consumption, FC system size, FC system replacement, and FC material composition. At the cradle-to-gate boundary, GHG emissions of the FC system ranged from 30.5 to 51.4 kg CO2eq/kW. The catalyst was the most impactful component due to the presence of platinum, followed by the balance of plant. In the cradle-to-grave boundary, raw material extraction and production phases were negligible, while the use phase was the main driver of the overall impact of the FC system. Certain equivalences were observed when considering other impact categories
Impact of Different LCI Modelling Scenarios on the LCA Results, A Case Study for the Automotive Sector
No full textSince vehicles are comprised of thousands of components,
it is essential to reduce the Life Cycle Inventory
(LCI) modelling workload. This study aims to compare
different LCI modeling workload-reducing scenarios to
provide a trade-off between the workload efforts and result
accuracy. To achieve the optimal balance between computational
effort and data specification requirements, the driver
seat is used as a case study, instead of the entire vehicle. When
all the components of a conventional light-duty commercial
vehicle are sorted by mass descending order, seats are among
the first five. In addition, unlike the other components, seats
are comprised of metals as well as a wide range of plastics and
textiles, making them a representative test case for a general
problem formulation. In this way, methodology and outcomes
can be reasonably extended to the entire vehicle. Regarding
the methodology, this study investigates the use of the
International Material Data System (IMDS), thus primary
data are used. First, the Life Cycle Assessment (LCA) of the
reference scenario is evaluated, in which the LCI model is
developed using the full list of substances at element level. The
reference scenario is characterized both by the highest degree
of details and major workload efforts. Second, the authors
consider three workload-reducing scenarios, which they refer
to as: the cut-off, the Verband Der Automobilindustrie (VDA)
and the one-substance-one-material scenarios. Then, granularity
is added, and different levels of disaggregation are
considered for all scenarios. Results indicate that when the
reference scenario is compared to the cut-off scenarios, environmental
impacts are significantly different in certain impact
categories (e.g., Abiotic Depletion) even with the smallest
cut-off (1%). In contrast, when Global Warming Potential
(GWP) is considered, the difference is negligible for any value
of cut-off ranging from 1 to 5%. As a result, if the focus is
solely on the GWP, the cut-off is a viable workload-reducing
strategy. Finally, the VDA and the One-substance-onematerial
scenarios appear to be the best compromises in terms
of workload and accuracy. The One-substance-one-material
scenario achieves the highest accuracy compared to the other
workload-reducing scenarios
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