HAL Portal UPHF (Université Polytechnique Hauts-de-France)
Not a member yet
28473 research outputs found
Sort by
Manifestations et métamorphoses scéniques du « silence homosexuel » dans "El público", de Federico García Lorca
No full textInternational audienceAccording to the well-known expression inherited from the English poet Alfred Douglas, homosexuality would be “the love that dares not speak its name”. El público (1930), by Federico García Lorca, is one of the very rare plays –and even one of the rare literary works– which, in the context of Spain in the 1930s, dared to say the name of this love; not only by staging homosexual characters, but also by making homosexuality one of its central themes. However, the author, along with many of the characters in the play on whom he projects his anxieties and impulses, keep bearing the stigmas of both the mask and the silence, that mark and construct the homosexual experience. This article suggests to analyse, in Lorca's so-called “unrepresentable” play, how this “homosexual silence” manifests itself, how this silenced homosexual voice makes itself heard.Según la famosa expresión, heredada del poeta inglés Alfred Douglas, la homosexualidad sería “el amor que no se atreve a decir su nombre”. El público (1930), de Federico García Lorca, es una de las muy pocas obras teatrales – y una de las escasas obras literarias – que, en el contexto de la España de los años 1930, se atreve a decir el nombre de este amor; no sólo poniendo en escena a personajes homosexuales, sino también haciendo de la homosexualidad uno de sus temas principales. Sin embargo, el autor, así como muchos personajes de la obra sobre los que aquél proyecta sus angustias y pulsiones, siguen estando marcados por los estigmas de la máscara y del silencio que acompañan y construyen la experiencia homosexual. En este artículo, se propone analizar, en la obra calificada como “irrepresentable” de Lorca, cómo se manifiesta este “silencio homosexual”, cómo se hace oír esta voz homosexual silenciada.Selon l’expression bien connue, héritée du poète anglais Alfred Douglas, l’homosexualité serait « l’amour qui n’ose pas dire son nom ». El público (1930), de Federico García Lorca, est l’une des très rares pièces de théâtre – et même l’une des rares œuvres littéraires – qui, dans le contexte de l’Espagne des années 1930, osa dire le nom de cet amour ; non seulement en mettant en scène des personnages homosexuels, mais également en faisant de l’homosexualité l’un de ses thèmes centraux. Toutefois, l’auteur, tout comme de nombreux personnages de la pièce sur lesquels celui-ci calque ses angoisses et pulsions, conservent en eux les stigmates du masque et du silence, qui jalonnent et construisent l’expérience homosexuelle. Cet article se propose ainsi d’analyser, dans la pièce dite « irreprésentable » de Lorca, comment se manifeste ce « silence homosexuel », comment se fait entendre cette voix homosexuelle "silenciada"
Physical and electrical characterizations of low n-doped MOCVD GaN-on-sapphire layers for power electronics applications
No full textInternational audienceThis work presents physical and electrical characterizations of low n-doped MOCVD GaN-on-sapphire layers and associated quasi-vertical Schottky Barrier Diodes (SBDs). Samples GaN drift layers have globally a similar quality as examined by XRD, AFM Raman spectroscopy, C-V measurements and I-V characteristics. Some crystal defects in the GaN layer are identified by Raman spectroscopy and SEM, and their effect on the electrical characteristics of the diodes is assessed. Most of the SBDs have reverse current densities at -100 V that are comparable to that of some of the best vertical GaN-on-GaN SBDs, which can be correlated to drift layers doping homogeneity and dislocation density
Le rôle de l’économie sociale et solidaire dans le développement de la filière vélo
No full textInternational audienc
Recueil de communications école d'hiver 2025 GDR ARCHI-META - DN METACMED
No full textNational audienceThe last 20 years have seen a remarkable growth in scientific interest in(elastic and mechanical) metamaterials. One of the reasons for this is thegreat potential that this subject area has in itself as a “link between differentdisciplines”, particularly acoustics and solid mechanics. In addition, through abetter mastery of architecture, it makes it possible to create complex enginee-ring systems with unconventional dynamic and quasi-static behavior.However, the literature seems to show that since its introduction in the early2000s, two almost independent macro-communities have formed around thissubject: that of acousticians, more focused on phenomenology, and that ofmechanics, more focused on methodology.However, it is clear that 1) these two communities are dealing with thesame scientific problem, and that 2) certain differences in purpose and lan-guage have given, and still give, the impression that these are two looselycoupled fields of research. This has made intercommunity dialogue insufficientuntil now. However, it is easy to see that the subjects investigated and the me-thodologies used are generally complementary. The time has come for a newcommunity to emerge, particularly at the international level.In this context, the ARCHI-META GdR proposes to seize this spontaneousconvergence and act as a catalyst to go beyond the specificities related toacoustics and mechanics, and thus to bring together a new community aroundarchitectured metamaterials. The overall objective is to get the communities(mechanics and acousticians) to work together to identify and resolve thecommon scientific issues that have come to light in recent years and to sharethe theoretical tools specific to the two communities in order to establish acommon language. This synergy will make it possible to address more effec-tively the scientific issues limiting the development of these promising techno-logies
The Physics–Mathematics Interplay in Newton Principia Geneva Edition (1822): A New Case Study on the Three–body Problem
No full textInternational audienc
Topological phase transitions of non-Hermitian periodic and disordered elastic systems
No full textInternational audienceTopological states have been extensively explored across diverse wave systems in recent decades. However, most research has focused on the periodic and Hermitian systems, while the roles of non-Hermiticity and disorder in topological properties need to be further explored, especially for two-dimensional systems. In this paper, the topological phase transitions induced by periodic and disordered on-site non-Hermitian modulations in one-dimensional (1D) and two-dimensional (2D) elastic systems and their topological edge and corner states are systemically studied. First, an analytical approach based on a generalization of the 1D Su–Schrieffer–Heeger (SSH) model is applied to investigate the full topological phase evolutions with different physical parameters and non-Hermitian strengths. It is found that an initially trivial system can become nontrivial under periodic or moderately disordered non-Hermitian modulations while increasing the level of randomness induces a nontrivial to trivial phase transition. Then, an elastic analog of the 1D SSH model constructed by elastic square plates with thin connecting beams is proposed, where the non-Hermitian modulations are introduced by piezoelectric patches with a feedback control loop. The evolutions of topological phases and their corresponding topological edge modes are numerically demonstrated in this elastic platform. Furthermore, the analytical SSH model and the realistic elastic platform are extended to 2D structures and their topological properties are deeply investigated. Studies indicate that periodic non-Hermitian modulations can drive trivial-nontrivial transitions and topological edge and higher-order corner states would appear for 2D structures. However, the 2D structures are more sensitive to the disorder and trivial-nontrivial phase transitions only survive under the small disorder. Larger non-Hermitian strength would result in the emergence of more nontrivial bandgaps and topological edge states. The main novelties of the paper are the proposition of a new elastic platform with feedback control for the study of non-Hermitian topological systems, a comprehensive analysis of combined effects of non-Hermiticity and disorders on topological properties, and the extension of 1D to 2D structures. Our work offers a reliable platform for studying topological properties in 1D and 2D non-Hermitian systems and designing active wave control devices
Effect of urea and squaramide IMPDH inhibitors on C. parvum: in vitro trial design impacts the assessment of drug efficacy
No full textInternational audienceThe protozoan parasite Cryptosporidium is the etiological agent of cryptosporidiosis, a ubiquitous diarrheic disease affecting humans and animals. Treatment options are limited, highlighting an urgent need for novel therapeutics. Despite decades of research and a wide diversity of strategies to tackle parasite metabolic pathways, no completely effective drug has been identified to date. Within targeted parasite enzymatic and metabolic pathways, the synthesis of nucleotide mediated by the inosine 5′-monophosphate dehydrogenase (IMPDH) enzyme is the focus of significant research efforts. Based on our prior studies of bacterial IMPDH inhibitors, we report herein the development and characterisation of novel inhibitors targeting Cryptosporidium parvum IMPDH (CpIMPDH). Specifically, we synthesised heteroaryl-containing urea and squaramide analogues to evaluate their potential in vitro anti-Cryptosporidium activity. Initial screening identified nine active compounds with the most potent candidates achieving IC 50 values as low as 2.2 μM. Subsequent time-course experiments revealed that the molecules effectively inhibit parasite invasion and early intracellular development but failed to tackle C. parvum growth when introduced at 30 h post infection. The present work introduces a new family of squaramide-derived IMPDH inhibitors and also interrogates the need to standardise commonly accepted protocols used for assessing anti-cryptosporidial drug activity.</div
A Brand New "Leopard-Skin Pill-Box Hat": Orality and Multimodality in the Translation of Bob Dylan’s Humour
No full textInternational audienc
Traitement de signaux neuronaux à base de réseaux de neurones à décharges optimisés pour accélérateurs neuromorphiques
No full textBrain-Machine Interfaces (BMIs) depend on sorting action potentials (spike sorting) to decode individual neuron activity, an essential process in both neuroprosthetics and the study of neural circuits. Advances in neural probes, particularly the increased electrode density, have dramatically expanded the volume of data to transmit and process, posing a significant challenge for low-power, on-chip BMIs. To address this, spike sorting must be performed in situ, using minimal computational resources while maintaining high accuracy, low energy consumption, and real-time performance. This thesis introduces a bio-inspired, unsupervised approach called the Neuromorphic Sparse Sorter (NSS), based on a spiking neural network architecture. NSS leverages sparse coding to efficiently handle high-dimensional neural signals. Unlike traditional binary communication, it employs multi-bit spiking to strike a balance between classification accuracy and energy efficiency. The system's effectiveness is validated on both simulated and real datasets, including noisy and non-stationary signals. A final hardware implementation confirms NSS's real-time processing capabilities and ultra-low power consumption, highlighting its potential for chronic implanted BMI applications.Les Interfaces Cerveau-Machine (ICM) reposent sur le tri de potentiels d'action pour décoder l'activité des neurones individuels, une méthode centrale pour des neuroprothèses et l'étude des circuits cérébraux. Avec l'amélioration des sondes neuronales incluant une densité croissante d'électrodes, la quantité de signaux à transmettre requiert une grande quantité d'énergie, ce qui complique le développement d'ICM embarquée. Le défi est alors d'effectuer un tri in situ, donc avec peu de ressources computationnelles, et de concilier qualité de tri, faible consommation énergétique et traitement en temps réel. Cette thèse propose une solution bio-inspirée non supervisée basée sur un réseau de neurones à décharges, appelé Neuromorphic Sparse Sorter (NSS). Le réseau exploite l'encodage parcimonieux pour traiter efficacement les signaux neuronaux de hautes dimensions. Une communication en décharge multi-bit, contrairement à une communication binaire classique, est utilisée afin de proposer une balance optimale entre qualité de tri et énergie requise pour une inférence du réseau. Les performances de NSS sont validées sur des données simulées et réelles, incluant des signaux fortement bruités et non stationnaires. Enfin, une implémentation sur matériel neuromorphique démontre la rapidité de traitement et la faible consommation énergétique du système
Emerging technologies for in-field plant virus detection: innovations and future directions
No full textInternational audiencePlant virus infections pose a substantial threat to crop quality and productivity, contributing to considerable economic losses in global agriculture annually. Traditionally, laboratories have widely adopted serological techniques, such as ELISA, and molecular methods, including quantitative PCR, for virus diagnostics. More recently, sophisticated next-generation sequencing approaches have been introduced to improve the efficiency and reliability of virus detection and identification. However, the development of sensitive, rapid and low-cost methods for the on-site detection, quantification and identification of plant viruses remains an ongoing challenge and is still in its early days. Point-of-care technologies have not fully realized their potential in agriculture due to numerous challenges, such as the elevated cost of development, lack of standardized validation and insufficient field testing. Therefore, future success depends on addressing these technical, economic and regulatory hurdles, as well as considering the specific user needs within the agricultural context. In this mini-review, recent advancements in biosensing for on-site plant virus monitoring, involving nanotechnology-based sensors, clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR-associated (Cas) systems, electrochemical and modern field-effect transistor-based sensors offering high sensitivity, speed and portability, are discussed. These technologies, when integrated with smartphone applications and/or machine learning modules, could enable real-time, field-deployable diagnostics for early disease management and sustainable agriculture. The aim is to raise awareness among plant virologists about this panel of emerging diagnostic concepts that could help improve current methods, ultimately facilitating the management of plant viral diseases