239700 research outputs found
Sort by
William Faulkner, The Sound and the Fury
No full textIl capitolo analizza il romanzo The Sound and the Fury, evidenziandone il rapporto con la storia del Sud statunitense (e in particolare la Guerra civile), l'immaginario pastorale meridionale e la sua dissoluzione. Particolare attenzione viene data altresì alla rappresentazione della femminilità e della nerezza
Introduzione
No full textNell’ambito della storiografia sull’università italiana nei primi decenni post-unitari, in molte occasioni è stato rivolto uno sguardo attento al ruolo svolto dal Consiglio superiore della Pubblica Istruzione con riferimento alla definizione delle grandi linee di sviluppo del sistema e alla più concreta gestione dei suoi meccanismi di autogoverno, dal rapporto centro-periferia agli equilibri tra atenei, fino alla dialettica tra gruppi e tendenze che attraversavano il corpo docente.
L’attenzione degli storici si è però finora fermata all’età liberale e ai primi anni del fascismo, lasciando tuttora da esplorare, e da ricostruire, l’attività del Consiglio superiore della Pubblica Istruzione negli anni successivi.
Facendo anche leva sull’ampio e prezioso patrimonio archivistico a disposizione pressoché ancora non esaminato dagli studiosi (ACS, Fondo Ministero della Pubblica Istruzione; Archivio del Ministero dell'Istruzione e del Merito, Raccolta dei Verbali del Consiglio Superiore della Pubblica Istruzione), il volume racchiude un'indagine a più mani dedicata alla storia dell’attività del Consiglio Superiore della Pubblica Istruzione in tema di università nel periodo 1945-1970
Magmatic significance and hydrothermal alteration of layered chromitites from the Bracco Gabbro Complex, Ligurian Ophiolites, Italy
No full textThe Bracco chromitites are hosted in the Mesozoic Ligurian Ophiolites (Italy) and provide key insights into the magmatic and post-magmatic (i.e. metamorphic and hydrothermal) evolution of gabbro-hosted chromitites in an oceanic mantle. Petrographic and mineralogical analyses reveal that the Bracco chromitites comprise cumulitic, massive to disseminated, layered chromitites overprinted by multi-stage alteration within altered olivine–clinopyroxene–anorthite cumulates. Detailed Cr–Al–Fe3+ systematics indicates that primary Cr- to Al-rich chromite, affected by metamorphic-hydrothermal processes under subgreenschist facies conditions, locally escaped recrystallization and metasomatic modification. Consequently, chromite cores preserve their primary magmatic
compositions consistent with crystallization from aluminous melts produced by low-degree partial mantle melting at a mid-ocean ridge (MOR) setting. Metamorphic-hydrothermal alteration is marked by multi-stage ferrian chromite rims, whereas based on their Mg content the associated chlorite is classified as clinochlore. Chlorite geothermometry indicates alteration temperatures in the range of ~100-300 °C, consistent with oceanic serpentinization under prehnite-pumpellyite facies conditions. The hydrothermal fluids were oxidizing, enriched in SiO2 and MnO, and circulated through fracture networks in the shallow oceanic lithosphere. Elevated MnO amounts in alteration rims suggest widespread Mn-enrichment in these fluids, potentially linking them to seafloor Mn deposits in the Ligurian Ophiolites. Together, these findings indicate that the Bracco chromitites, their gabbroic hosts, and associated lherzolitic mantle rocks were at least partially exposed at the Tethyan seafloor prior to their final emplacement during the Alpine orogenetic phase, where serpentinization promoted complex chromite alteration
Cell Wall-derived Mechanical Signals Control Cell Growth and Division During Root Development
No full textOrganogenesis emerges from the interplay between genetic and physical interactions within a growing cellular system. While numerous studies have explored how genetic and molecular networks regulate cell activity, the impact of physical interactions and the resulting mechanical constraints on organ development remains poorly understood. In this study, we combine extensive genetic analysis, live imaging, and mechanical measurements with spatiotemporal computational modeling to show that, in the Arabidopsis root, changes in the mechanical properties of elongating cell walls influence growth and division rate of neighboring meristematic cells, thereby shaping root development. We propose that the cell wall serves as a crucial source of both autonomous and nonautonomous mechanical signals, providing a compelling example of how mechanical forces contribute to organ growth and development
Rusty-Cracker: A Multi-core Connected Components Library in Rust
No full textWe present Rusty-Cracker, a high-performance Rust library that implements a parallel version of the Cracker algorithm for efficiently identifying connected components in large-scale graphs. Designed to address the growing demands of graph analytics in fields such as social network analysis, bioinformatics, and infrastructure modeling, Rusty-Cracker leverages Rust's concurrency and memory safety features to ensure both speed and reliability. The adapted Cracker algorithm capitalizes on modern multi-core architectures through parallel processing, effectively minimizing synchronization overhead and optimizing workload distribution. This design significantly reduces computational time while maintaining accuracy. We present the implementation details and evaluate its performance on a real-world dataset of undirected graphs
Validation of a new textile sensor band for on-farm heart rate variability assessment in calves
No full textHeart rate variability (HRV) has been studied as an indicator of stress and welfare in various species, including dairy calves, where significant changes in HRV were linked to cow-calf separation, isolation and disbudding. Wearable bands with smart textiles biotechnology offer a promising, low-stress alternative due to their comfort and ease of use without shaving or taping. The aim of this study was to examine if smart textiles biotechnology could be compared to a Standard base-apex ECG for measuring HRV in dairy calves. Twenty healthy Italian Holstein calves aged (20-60 days old) were recruited. Standard base-apex ECG and Smartex ECG were simultaneously acquired for 16 min in the standing, unsedated, unclipped calves. After extracting HRV parameters, comparisons were made using time, frequency, and nonlinear analyses. Agreement between devices was assessed using the Bland-Altman test and Spearman's correlations. Sperman's showed a very strong correlation for Mean RR, SDNN and LF (p value < .001), and a strong correlation for RMSSD, LF/HF and SampEn, indicating the most stable relationship between the two systems. Smart textiles biotechnology can be used for HRV measurement in calves, offering a valuable tool for animal welfare assessment
Task-Agnostic Experts Composition for Continual Learning
No full textCompositionality is one of the fundamental abilities of the human reasoning process, that allows to decompose a complex problem into simpler elements. Such property is crucial also for neural networks, especially when
aiming for a more efficient and sustainable AI framework. We propose a compositional approach by ensembling zero-shot a set of expert models, assessing our methodology using a challenging benchmark, designed to test
compositionality capabilities. We show that our Expert Composition method is able to achieve a much higher accuracy than baseline algorithms while requiring less computational resources, hence being more efficient
Comparative Evaluation of ChatGPT and Students in the Outcomes of Online Learning Courses Related to Security
No full textArtificial Intelligence has increasingly affected the educational scenario, and its careful assessment is more and more essential to avoid misuses and not fair exploitation on the part of the students. This paper provides a preliminary comparison between the performance of a very well-known Large Language Model, namely ChatGPT 3.5, and those of a cohort of students attending online courses about network and computer security in an online university. The analysis has been performed by considering both multiple-choice as well as open-ended questions and did not consider any form of fine-tuning nor contextualization for the training of the considered Large Language Model. The obtained results demonstrate a very good performance of ChatGPT 3.5 in answering the prompted questions on both courses and on both types of questions. Moreover, we have also analyzed some of the few hallucinations that took place whenever the overall context of the questions was very similar or even the same
Apresentação: Investigações em línguas e culturas de herança no Brasil: perspectivas teóricas e práticas em diálogo
No full textApresentação da obra: com o objetivo de contribuir para o debate, as
autoras e autores do presente livro analisam em diferentes situações,
sejam elas ligadas às migrações no país ou aos variados contextos de
transmissão intergeracional, as heranças culturais e linguísticas.
Revelam paradigmas e ações pontuais, descrevem tipologias de
gerenciamento linguístico familiar para desenvolver a aquisição das
crianças e jovens; pontuam as mudanças institucionais em se tratando de reconhecimento, no Brasil, das línguas minoritárias como patrimônio imaterial; e descrevem modalidades de manifestação das
heranças culturais, não somente dos sujeitos, mas dos espaços de
preservação da língua, da cultura e da cozinha de herança
Design of an axial rotary transformer for wound rotor synchronous machines excitation winding feeding
No full textIn recent years, the use of permanent magnet (PM) machines has spread in industrial
applications at the expense of wound rotor synchronous machines, since PM motors have a higher efficiency, guaranteed by the absence of rotor copper losses. Nowadays, the high cost and low availability of the rare earths used to realize the PMs make the interest in wound rotor synchronous machines grow again. The main issue connected to their use is the employment of a brushes-slip ring system to feed the rotating excitation winding. Since the slip rings rub the brushes, the system has to be frequently replaced. In this framework, a wireless power transmission between the fixed source and the spinning winding is proposed to remove the brushes-slip ring system. The use of a rotary transformer was proposed many years ago [1], but only recently, it has become possible to effectively use it thanks to the improvements in the switching frequency of power inverters that allow the increase in the working frequency and the reduction of the transformer size. In this case, the whole excitation system is composed of a DC-power supply, an inverter, the transformer and a rectifier (see Figure 1).
The considered geometry is composed of two cup-shaped ferromagnetic cores axially
aligned, with an airgap between them: one core is fixed while the other spins with the
synchronous machine’s rotor. In each core, a winding is realised (see Figure 1), and the inverter feeds the primary one, arranged in the fixed core. The magnetic field produced by the current in the primary winding induces a voltage in the spinning secondary coil, realised in the rotary core. Such a voltage is rectified and applied to the synchronous machine’s excitation winding. With respect to a power transformer, the rotary one has a higher leakage inductance and a smaller magnetising inductance due to the airgap