bluuebunny/crossref_metadata_2025 huggingface dataset:
Determining the optimal bid direction of a generation company using the gradient vector of the profit function in the network constraints of the electricity market
Authors: Hajiabadi Mohammad Ebrahim , Samadi Mahdi , Nikkhah Mohammad Hassan , Lotfi Hossein , Li Li
Published: October 2024

One of the primary challenges faced by generation companies (GenCos), which operate multiple generation units within the electricity market, is the determination of the optimal bid price for these units to maximize profit. This paper proposes a novel approach to ascertain the optimal bid price direction for GenCos by leveraging the gradient vector of the profit function within the constraints of the electricity market. First, the Jacobian matrix of unit profits is computed using the electricity market structural decomposition method. This matrix highlights how the profit of generation units is affected by market input parameters, including the bid prices of the units. Then, the gradient vector of the GenCos' profit function and the optimal bid price direction are derived from the Jacobian matrix. The methodology is applied to a 24‐bus IEEE network, with results validated against those from a simulation method to confirm the efficacy of the proposed approach. The simulation results show that the highest and lowest profit changes with a step increase of 0.1$/MWh are observed for GenCo 4 and GenCo 6 with values of 60.28 and 2.20 $/h, respectively. The proposed approach can be effective in the changes of bid direction of the units of a GenCo to achieve the highest possible profit.
A lightweight object detection approach based on edge computing for mining industry
Authors: Hanif Muhammad Wahab , Li Zhanli , Yu Zhenhua , Bashir Rehmat
Published: October 2024

Coal Mining enterprises deploy numerous monitoring devices to ensure safe and efficient production using target detection technologies. However, deploying deep detection models on edge devices poses challenges due to high computational loads, impacting detection speed and accuracy. A mining target detection dataset has been created to address these issues, featuring key targets in coal mining scenes such as miners, safety helmets, and coal gangue. A model is proposed to improve real‐time performance for edge mining detection tasks. Detection performance is enhanced by incorporating a Pixel‐wise Normalization Spatial Attention Module (PN‐SAM) into the MobileNet‐v3 bneck structure and replacing the h‐swish activation function with Mish, providing more prosperous gradient information transfer. The proposed model, YOLO‐v4‐LSAM, shows a 3.2% mAP improvement on the VOC2012 dataset and a 2.4% improvement on the mining target dataset compared to YOLO‐v4‐Tiny, demonstrating its effectiveness in mining environments. These enhancements enable more accurate and efficient detection in resource‐constrained edge environments, contributing to safer and more reliable monitoring in coal mining operations.
Surface defect detection method of aluminium alloy castings based on data enhancement and CRT‐DETR
Authors: Li Long , Gao Mingyang , Tian Xing , Wang Chengjun , Yu Jiangli
Published: October 2024

The surface quality of aluminium alloy castings is crucial to quality control. Aiming to address the challenges of limited samples and extensive computation in deep learning‐based surface defect detection for aluminium alloy castings, this paper proposes a surface defect detection method based on data enhancement and the Casting Real‐Time DEtection TRansformer. First, to tackle the issue of small sample sizes and uneven distribution in surface defect data sets of aluminium alloy castings, ECA‐MetaAconC Deep Convolution Generative Adversarial Networks is proposed for generating defects with fewer samples and employ the image augmentation (IMGAUG) library for sample enhancement. Second, building upon the Real‐Time DEtection TRansformer (RT‐DETR), a lightweight partial‐rep convolution is designed to decrease the network's parameter count. Simultaneously, the Deformable attention module and the DRBC3 module are introduced to enhance the neck network, thereby improving the model's capability to capture information and enhancing its detection performance. Compared to RT‐DETR, this method reduces the number of model parameters by 38.7%, increases mAP by 1.5%, and achieves a frame rate that is 1.58 times higher than the original model. The experimental results demonstrate that this method can effectively and accurately detect surface defects in aluminium alloy castings, satisfying industrial requirements.
Comparison of space vector and switching frequency optimal pulse width modulation for diode free F‐type multi level inverter
Authors: Madhavan Meenakshi , Nallaperumal Chellammal , Hosseinpour Alireza
Published: October 2024

This study presents a comprehensive examination of space vector pulse width modulation (SVPWM) and switching frequency optimal PWM (SFOPWM) for an F‐type multilevel inverter (FTMLI). SVPWM offers a simple, digital implementation for three‐phase, three‐level inverter structures, and carrier‐based SFOPWM allows for maximum use of switching frequency with a simple construction. This approach reveals the underlying relationship between the above two PWM techniques with various amplitude and frequency modulation indices to ensure the performance of FTMLI. A suitable comparative study was carried out to verify the PWM techniques based on the inverter output voltage, total harmonic distortion, switching stress, and filter size. The analytical conclusions are supported by the simulation results and their experimental validation.
Effect of temperature on seasonal wind power and energy potential estimates in Nordic climates
Authors: Salmelin Markus , Karjunen Hannu , Lassila Jukka
Published: October 2024

A major obstacle standing in the way of full‐scale adoption of renewable energy sources is their intermittency and seasonal variability. To better understand the power generation dynamics, the effect of air density due to temperature on power and energy generation figures was modelled. The model uses historical ERA5 data and considers changes in weather patterns in a subarctic climate where seasonal changes are most pronounced. The power generation figures of using a mean and a dynamic air density value were compared and the results show that power generation estimates may be under‐ and overestimated by on average 5% up to 10% in winter and summer, respectively. This can have implications for the sizing of power transmission infrastructure and energy storage in both on‐grid and off‐grid applications as well as power availability. The topic is highly relevant in the Nordic countries where roughly 10% of new global added wind capacity is installed annually.
Dark lens candidates from Gaia Data Release 3
Authors: Kruszyńska K. , Wyrzykowski Ł. , Rybicki K. A. , Howil K. , Jabłońska M. , Kaczmarek Z. , Ihanec N. , Maskoliūnas M. , Bronikowski M. , Pylypenko U. , Udalski A. , Mróz P. , Poleski R. , Skowron J. , Szymański M. K. , Soszyński I. , Pietrukowicz P. , Kozłowski S. , Ulaczyk K. , Iwanek P. , Wrona M. , Gromadzki M. , Mróz M. J. , Abe F. , Bando K. , Barry R. , Bennett D. P. , Bhattacharya A. , Bond I. A. , Fukui A. , Hamada R. , Hamada S. , Hamasaki N. , Hirao Y. , Ishitani Silva S. , Itow Y. , Koshimoto N. , Matsubara Y. , Miyazaki S. , Muraki Y. , Nagai T. , Nunota K. , Olmschenk G. , Ranc C. , Rattenbury N. J. , Satoh Y. , Sumi T. , Suzuki D. , Tristram P. J. , Vandorou A. , Yama H.
Published: October 2024

Gravitational microlensing is a phenomenon that allows us to observe the dark remnants of stellar evolution, even if these bodies are no longer emitting electromagnetic radiation. In particular, it can be useful to observe solitary neutron stars or stellar-mass black holes, providing a unique window through which to understand stellar evolution. Obtaining direct mass measurements with this technique requires precise observations of both the change in brightness and the position of the microlensed star. The European Space Agency’s Gaia satellite can provide both. Using publicly available data from different surveys, we analysed events published in the Gaia Data Release 3 (Gaia DR3) microlensing catalogue. Here, we describe our selection of candidate dark lenses, where we suspect the lens is a white dwarf (WD), a neutron star (NS), a black hole (BH), or a mass-gap object, with a mass in the range between the heaviest NS and the least massive BH. We estimated the mass of the lenses using information obtained from the best-fitting microlensing models, source star, Galactic model, and the expected parameter distributions. We found eleven candidates for dark remnants: one WDs, three NSs, three mass-gap objects, and four BHs.
NH3 (1,1) hyperfine intensity anomalies in infall sources
Authors: Wu Gang , Henkel Christian , Zhou Dongdong , Wyrowski Friedrich , Menten Karl M. , Esimbek Jarken
Published: October 2024

Identifying infall motions is crucial for our understanding of accretion processes in regions of star formation. The NH3 (1,1) hyperfine intensity anomaly (HIA) has been proposed to be a readily usable tracer for such infall motions in star-forming regions harboring young stellar objects at very early evolutionary stages. In this paper, we seek to study the HIA toward 15 infall candidate regions in order to assess its reliability as an infall tracer. Using deep observations of the NH3 (1, 1) transition with the Effelsberg 100 m telescope, we identified HIAs toward all 15 targets. Of the 15 sources, 14 exhibit anomalous intensities in either the inner or outer satellite lines. All the derived HIAs conform to the framework of the existing two models, namely hyperfine selective trapping (HST) and systematic contraction or expansion motion (CE) models. In our sample of infall candidates, the majority of the HIAs remain consistent with the HST model. Only in three targets are the HIAs consistent with infall motions under the CE model. Thus, the HIA could indeed be used as an infall tracer, but does not appear to be highly sensitive to infall motions in our single-dish data. Nevertheless, the emission could be blended with emission from outflow activities. HIAs consistent with the HST model show stronger anomalies with increasing kinetic temperatures (TK), which is expected based on the HST model. On the other hand, HIAs consistent with infall motions show little dependence on Tk . Therefore, HIAs may preferably trace the infall of cold gas.
Chemical Evolution of R-process Elements in Stars (CERES)
Authors: Fernandes de Melo Raphaela , Lombardo Linda , Alencastro Puls Arthur , Romano Donatella , Hansen Camilla Juul , Tsiatsiou Sophie , Meynet Georges
Published: October 2024

Context. Carbon, nitrogen, and oxygen are the most abundant elements throughout the universe, after hydrogen and helium. Studying these elements in low-metallicity stars can provide crucial information on the chemical composition in the early Galaxy and possible internal mixing processes that can alter the surface composition of the stars.

Aims. This work aims to investigate the chemical abundance patterns for CNO elements and Li in a homogeneously analyzed sample of 52 metal-poor halo giant stars. From these results, we have been able to determine whether internal mixing processes have taken place in these stars.

Methods. We used high-resolution spectra with a high signal-to-noise ratio (S/N) to carry out a spectral synthesis to derive detailed C, N, O, and Li abundances for a sample of stars with metallicities in the range of −3.58 ≤ [Fe/H] ≤ −1.79 dex. Our study was based on the assumption of one-dimensional (1D) local thermodynamic equilibrium (LTE) atmospheres.

Results. Based on carbon and nitrogen abundances, we investigated the deep mixing taking place within stars along the red giant branch (RGB). The individual abundances of carbon decrease towards the upper RGB while nitrogen shows an increasing trend, indicating that carbon has been converted into nitrogen. No signatures of ON-cycle processed material were found for the stars in our sample. We computed a set of galactic chemical evolution (GCE) models, implementing different sets of massive star yields, both with and without including the effects of stellar rotation on nucleosynthesis. We confirm that stellar rotation is necessary to explain the highest [N/Fe] and [N/O] ratios observed in unmixed halo stars. The predicted level of N enhancement varies sensibly in dependence of the specific set of yields that are adopted. For stars with stellar parameters similar to those of our sample, heavy elements such as Sr, Y, and Zr appear to have unchanged abundances despite the stellar evolution mixing processes.

Conclusions. The unmixed RGB stars provide very useful constraints on chemical evolution models of the Galaxy. As they are more luminous than unevolved (main sequence and turnoff) stars, they also allow for stars to be probed at greater distances. The stellar CN-cycle clearly changes the atmospheric abundances of the lighter elements, but no changes were detected with respect to the heavy elements.
Mixed-mode coupling in the red clump
Authors: van Rossem Walter E. , Miglio Andrea , Montalbán Josefina
Published: October 2024

The investigation of global, resonant oscillation modes in red giant stars offers valuable insights into their internal structures. In this study, we investigate in detail the information we can recover on the structural properties of core-helium burning (CHeB) stars by examining how the coupling between gravity- and pressure-mode cavities depends on several stellar properties, including mass, chemical composition, and evolutionary state. Using the structure of models computed with the stellar evolution code MESA, we calculate the coupling coefficient implementing analytical expressions, which are appropriate for the strong coupling regime and the structure of the evanescent region in CHeB stars. Our analysis reveals a notable anti-correlation between the coupling coefficient and both the mass and metallicity of stars in the regime M ≲ 1.8 M⊙, in agreement with Kepler data. We attribute this correlation primarily to variations in the density contrast between the stellar envelope and core. The strongest coupling is expected thus for red-horizontal branch stars, partially stripped stars, and stars in the higher-mass range exhibiting solar-like oscillations (M ≳ 1.8 M⊙). While our investigation emphasises some limitations of current analytical expressions, it also presents promising avenues. The frequency dependence of the coupling coefficient emerges as a potential tool for reconstructing the detailed stratification of the evanescent region.
CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy
Authors: Fontani F. , Vermariën G. , Viti S. , Gigli D. , Colzi L. , Beltrán M. T. , Caselli P. , Rivilla V. M. , Sánchez-Monge A.
Published: October 2024

Context. Single-dish observations suggest that the abundances of organic species in star-forming regions of the outer Galaxy, which are characterised by sub-solar metallicities, are comparable to those found in the local Galaxy.

Aims. To understand this counter-intuitive result and avoid a misleading interpretation due to beam dilution effects at these large distances, spatially resolved molecular emission maps are needed to correctly link the measured abundances and local physical properties.

Methods. We observed several organic molecules with the Atacama Large Millimeter Array towards WB89-671, the source with the largest galactocentric distance (23.4 kpc) of the project CHEMical complexity in star-forming regions of the OUTer Galaxy (CHEMOUT) at a resolution of ~15 000 au. We compared the observed molecular abundances with chemical model predictions.

Results. We detected emission of c-C3H2, C4H, CH3OH, H2CO, HCO, H13CO+, HCS+, CS, HN13C, and SO. The emission morphology is complex, extended, and different in each tracer. In particular, the most intense emission in H13CO+, H2CO and c-C3H2 arises from two millimeter-continuum infrared-bright cores. The most intense CH3OH and SO emission predominantly arises from the part of the filament that lacks continuum sources. The narrow line widths across the filament indicate quiescent gas in spite of the two embedded protostars. The derived molecular column densities are comparable with those in local star-forming regions, and they suggest an anti-correlation between hydrocarbons, ions, HCO, and H2CO on the one hand, and CH3OH and SO on the other.

Conclusions. The static chemical models that match the observed column densities best favour low-energy conditions that are expected at large galactocentric radii, but they also favour carbon elemental abundances that exceed those derived by extrapolating the [C/H] galactocentric gradient at 23 kpc by three times. This would indicate a flatter [C/H] trend at large galactocentric radii, which is in line with a flat abundance of organics. However, to properly reproduce the chemical composition of each region, models should include dynamical evolution.
Effects of the internal temperature on vertical mixing and on cloud structures in ultra-hot Jupiters
Authors: Noti Pascal A. , Lee Elspeth K. H.
Published: October 2024

Context. The vertical mixing in hot-Jupiter atmospheres plays a critical role in the formation and spacial distribution of cloud particles in their atmospheres. This affects the observed spectra of a planet through cloud opacity, which can be influenced by the degree of cold trapping of refractory species in the deep atmosphere.

Aims. We aim to isolate the effects of the internal temperature on the mixing efficiency in the atmospheres of ultra-hot Jupiters (UHJs) and the spacial distribution of cloud particles across the planet.

Methods. We combined a simplified tracer-based cloud model, a picket fence radiative-transfer scheme, and a mixing length theory to the Exo-FMS general circulation model. We ran the model for five different internal temperatures at typical UHJ atmosphere system parameters.

Results. Our results show the convective eddy diffusion coefficient remains low throughout the vast majority of the atmosphere, with mixing dominated by advective flows. However, some regions can show convective mixing in the upper atmosphere for colder interior temperatures. The vertical extent of the clouds is reduced as the internal temperature is increased. Additionally, a global cloud layer gets formed below the radiative-convective boundary (RCB) in the cooler cases.

Conclusions. Convection is generally strongly inhibited in UHJ atmospheres above the RCB due to their strong irradiation. Convective mixing plays a minor role compared to advective mixing in keeping cloud particles aloft in UHJs with warm interiors. Higher vertical turbulent heat fluxes and the advection of potential temperature inhibit convection in warmer interiors. Our results suggest that isolated upper atmosphere regions above cold interiors may exhibit strong convective mixing in isolated regions around Rossby gyres, allowing aerosols to be better retained in these areas.
An acceleration-radiation model for nonthermal flares from Sgr A*
Authors: Petropoulou Maria , Ponti Gabriele , Stel Giovanni , Mastichiadis Apostolos
Published: October 2024

Context. Sgr A⋆ is the electromagnetic counterpart of the accreting supermassive black hole in the Galactic center. Its emission is variable in the near-infrared (NIR) and X-ray wavelengths on short timescales (several minutes to a few hours). The NIR light curve displays red-noise variability, while the X-ray light curve exhibits bright flares that rise by many orders of magnitude upon the stable X-ray quiescent emission. Every X-ray flare is associated with a bright NIR flux change, but the opposite is not always true. The physical origin of NIR and X-ray flares is still under debate.

Aims. We introduce a model for the production of NIR and X-ray flares from an active region in Sgr A⋆, where particle acceleration takes place intermittently. A fraction of electrons from their thermal pool is accelerated to higher energies while they radiate via synchrotron and synchrotron self-Compton (SSC) processes. In contrast to other radiation models for Sgr A⋆ flares, the particle acceleration is not assumed to be instantaneous.

Methods. We studied the evolution of the particle distribution and the emitted electromagnetic radiation from the flaring region by numerically solving the kinetic equations for electrons and photons. Our calculations took the finite duration of particle acceleration, radiative energy losses, and physical escape from the flaring region into account. To gain better insight into the relation of the model parameters, we complemented our numerical study with analytical calculations.

Results. Flares are produced when the acceleration episode has a finite duration. The rising part in the light curve of a flare is related to the particle acceleration timescale, while the decay is controlled by the cooling or escape timescale of particles. The emitted synchrotron spectra are power laws whose photon index is determined by the ratio of the acceleration and escape timescales, followed by an exponential cutoff. This occurs at the characteristic synchrotron photon energy emitted by particles with the maximum Lorentz factor (where energy loss and gain rates become equal). The NIR flux increases before the onset of the X-ray flare, and the time lag is linked to the particle acceleration timescale. Bright X-ray flares, such as the one observed in 2014, have γ-ray counterparts that might be detected by the Cherenkov Telescope Array Observatory.

Conclusions. Our generic model for NIR and X-ray flares favors an interpretation of diffusive nonresonant particle acceleration in magnetized turbulence. If direct acceleration by the reconnection electric field in macroscopic current sheets causes the energization of particles during flares in Sgr A⋆, then models considering the injection of preaccelerated particles into a blob where particles cool and/or escape would be appropriate to describe the flare.
Methodological foundations of directional stability of a machine-tractor unit in sloping agriculture
Authors: Tarasova Saria , Asmankin Evgeny , Ushakov Yuriy , Ivanov Pavel , Neufeld Elena , Rotova Victoria
Published: October 2024

The article describes a method for holding a tractor unit (MTA) on a slope when performing technological operations by changing the angles of the tractor wheels and the mounted machine. The variants of the MTA movement trajectories are considered, graphs of wheel deflection angles are presented, and an algorithm for calculating compensation for the total displacement of the MTA with excessive turning on the slope is presented. Calculations have shown an 11% reduction in the reaction time of the unit to changes in landscape characteristics with operational adjustment of the angle of withdrawal of the “equivalent” wheel, carried out by varying the pressure exclusively by the support and transport wheels of the mounted gun.
Automated information system for accounting of goods in a supermarket
Authors: Masiuk M.A. , Kleshko I.I. , Panfilov I.A. , Lobkow K.Y. , Sivtsova E.I.
Published: October 2024

This text describes the development and implementation of an automated information system for the accounting of goods in the SSP supermarket. The system allows you to monitor the availability of goods in stock and on the shelves, automatically compile reports on the work done and simplifies the process of transferring documents between employees. Thanks to the use of the system, the company reduced its costs and was able to increase profits by expanding the range of products without expanding the staff.
Strategies for the sustainable development of the PPP-based economic system
Authors: Babkin Alexandr , Semenov Alexandr , Babkin Ivan , Shkarupeta Elena , Mikhailov Pavel
Published: October 2024

The article is devoted to the implementation of public-private partnership (hereinafter - PPP) in modern Russia, which is forced to reorient its policy in the field of implementation of key PPP projects in order to maintain the focus on the strategy of implementing sustainable development in the economy. This problem is not covered in domestic literature and is extremely superficially touched upon in foreign literature, which determines the need for its consideration. The purpose of the work is to study data on the implementation of the PPP model in modern Russia with a focus on a sustainable development strategy. The key problem is the conclusion of transnational PPPs. Methods: analysis, synthesis, data comparison, formalization and generalization of key conclusions and proposals. The results provide an analysis of the likely comparison of data on transnational transactions concluded in the Russian Federation and their impact on the overall economic growth of the country. There are also suggestions for optimizing the further development of this area and its possibilities for optimizing the PPP model. The work includes the analysis of statistical data, as well as official information provided in open sources. In conclusion, an overview of possible publications and further research in the field of PPP and the development of sustainable development policy of the Russian economy is presented.
Mivar-based route planning simulation model for obstacle-aware autonomous agricultural machinery
Authors: Kotsenko Anton , Varlamov Oleg , Denisov Alexey , Matsnev Alexander , Goryachkin Boris
Published: October 2024

Autonomous robot navigation is increasingly becoming an important task that requires solutions. This paper explores the practical application of logical artificial intelligence to address the problem of route planning, using the example of a computer game. Within the scope of this work, a knowledge base model was created, and a new version of the mivar reasoner was developed for integration with Unity. This reasoner allows the activation of logical rules with linear complexity. As a result, a system was developed that processes user input for position and moves an autonomous agent in a virtual environment according to the rules. This work confirms the feasibility of using mivar technologies to improve control systems of autonomous robots in the area of agriculture. The study also emphasizes the adaptability of mivar networks in dynamic environments, demonstrating their ability to effectively process changes in real-time. This research shows enhanced decision-making capabilities and reliable navigation strategies for autonomous agents, setting a precedent for future developments in autonomous digital solutions for agriculture. The results obtained open new prospects for the advancement of technologies in the field of autonomous navigation.
Habitat-based variation in the trophic ecology of the world’s highest-altitude self-sustaining population of invasive rainbow trout
Authors: González Karina , Rivara Pablo , Docmac Felipe , Gomez−Uchida Daniel , Harrod Chris
Published: October 2024

Rainbow trout (Oncorhynchus mykiss) have been widely introduced outside of their natural range and are one of the World’s most invasive species. Illegally introduced into the isolated, high-altitude (4520 m) Chungará catchment of northern Chile, rainbow trout have now been present in the system for ∼30 years and to our knowledge are the World’s highest known self-sustaining population. However, nothing is known about the status and impacts of these trout in the system. We analysed stomach contents and stable isotopes (δ13C, δ15N, δ34S) from liver and muscle to study the trophic ecology of rainbow trout from lake, river mouth and riverine habitats in the Chungará catchment to understand their basic ecology and to characterise their potential trophic interactions with native taxa. Both stomach contents and stable isotope values showed spatial differences in diet and habitat use, but also revealed that diet varied temporally within habitats. The trophic position of rainbow trout was similar in the three habitats examined and was constant over time, apart from the riverine population. Predation by rainbow trout had different potential effects across pelagic, benthic, and riverine habitats in the Chungará catchment, through the consumption of zooplankton, native amphipods, aquatic insects, and the endemic cypriniodontid fish Orestias chungarensis.
Le psychiatre devant l’aide à mourir
Authors: Jovelet Georges
Published: October 2024

L’auteur propose une analyse de la proposition de loi sur l’aide à mourir, à partir de l’entretien du chef de l’état avec deux journalistes en date du 10 mars dernier, du préambule et des dix articles du projet de loi publiés le 10 avril. Cette proposition sera soumise aux députés fin mai. La mise en perspective des trois documents en éclaire la philosophie. Si un écart peut être observé entre les propos du président de la République et le projet de loi, les motssuicide assistéeteuthanasiesont effectivement élidés du texte. Les débats à propos de cette loi, objet de controverses publiques, amènent à une réflexion sur l’aide à mourir, ses enjeux à partir de trois notions : existe-t-il des suicides « non pathologiques » légitimant le suicide assisté ? L’accompagnement à mourir peut-il être considéré comme un soin ; enfin ce projet s’inscrit–il en rupture ou en continuité avec l’appareil législatif actuel ? L’article est conclu par une réflexion critique sur les conditions de mise en place de l’aide à mourir promues par le projet de loi.
Ressources et richesses compensatoires chez des patients souffrant de troubles neuro-cérébraux
Authors: Viala Marie-Françoise
Published: October 2024

L’étude des mécanismes compensatoires a été introduite par Eugène Minkowski dans le champ de la méthode phénoméno-structurale. Elle a montré que les troubles psychiques ne peuvent s’envisager uniquement en termes de carences ou de destructions de certaines fonctions mentales, mais qu’ils obéissent aussi à une recomposition unitaire de la personne et de la personnalité à partir de ses déficits.

L’analyse fine des propos des patients à travers leur langage spontané ou certaines épreuves psychologiques restitue dans leur complexité à la fois ces failles et les redéfinitions conséquentes de la structure qui les soutient et actualise.

Le suivi au long cours de malades souffrant d’atteintes neuro-cérébrales dont nous rendons compte dans cet article sensibilise à une compréhension d’ensemble de ces phénomènes dans leurs dimensions neurologique et psychopathologique associées, où la résonance relationnelle et affective tient jusqu’au bout un rôle prépondérant.
Expérience et trajectoire d’un atelier de libre expression au Brésil
Authors: Aguirre Antúnez Andrés Eduardo , Santoantonio Jacqueline
Published: October 2024

Cet article rend compte du développement durant vingt-cinq années d’un atelier de peinture d’expression libre dans deux milieux universitaires publics au Brésil, l’un en médecine et l’autre en psychologie, créé sur la base initiale d’un échange fructueux avec Michel Ternoy et son travail au Centre Hospitalier Spécialisé de Saint-Venant en France. L’atelier, sous ces deux lieux d’inscription, révèle le potentiel créatif à l’œuvre en termes de possibilités d’échange d’expériences et d’éprouvés relationnels dans une construction conjointe entre ceux qui soutiennent et croient en l’expression comme acte et mouvement créatif dans l’existence de la personne à travers sa réalisation picturale et les nuances significatives des situations vives avec des patients adultes, de jeunes étudiants universitaires et des enfants. L’expérience de création de groupe nous permet d’entrer en contact avec ce qui était indicible et nous invite à rencontrer notre propre histoire, avec le devenir et avec le surplus de vie en nous dans une relation partagée. L’espace et l’expérience offerts par l’Atelier de Peinture et Libre Expression s’avèrent être des actions importantes qui accueillent les gestes et les traits expressifs avec lesquels les thérapeutes contribuent aux multiples possibilités inconnues et vivantes qui font écho à l’expression, à la création et à la souffrance humaine.
System size effects on the free energy landscapes from molecular dynamics of phase-separating bilayers
Authors: Poruthoor Ashlin J. , Stallone Jack J. , Miaro Megan , Sharma Akshara , Grossfield Alan
Published: October 2024

The “lipid raft” hypothesis proposes that cell membranes contain distinct domains of varying lipid compositions, where “rafts” of ordered lipids and cholesterol coexist with disordered lipid regions. Experimental and theoretical phase diagrams of model membranes have revealed multiple coexisting phases. Molecular dynamics (MD) simulations can also capture spontaneous phase separation of bilayers. However, these methods merely determine the sign of the free energy change upon phase separation—whether or not it is favorable—but not the amplitude. Recently, we developed a workflow to compute the free energy of phase separation from MD simulations using the weighted ensemble method. However, while theoretical treatments generally focus on infinite systems and experimental measurements on mesoscopic to macroscopic systems, MD simulations are comparatively small. Therefore, if we are to put the results of these calculations into the appropriate context, we need to understand the effects the finite size of the simulation has on the computed free energy landscapes. In this study, we investigate this phenomenon by computing free energy profiles for a model phase-separating system as a function of system size, ranging from 324 to 10 110 lipids. The results suggest that, within the limits of statistical uncertainty, bulk-like behavior emerges once the systems contain roughly 4000 lipids.
Magnon squeezing via reservoir-engineered optomagnomechanics
Authors: Fan Zhi-Yuan , Zhu Huai-Bing , Li Hao-Tian , Li Jie
Published: October 2024

We show how to prepare magnonic squeezed states in an optomagnomechanical system in which magnetostriction induced mechanical displacement couples to an optical cavity via radiation pressure. We discuss two scenarios depending on whether the magnomechanical coupling is linear or dispersive. We show that in both cases the strong mechanical squeezing obtained via two-tone driving of the optical cavity can be efficiently transferred to the magnon mode. In the linear coupling case, stationary magnon squeezing is achieved, while in the dispersive coupling case, a transient magnonic squeezed state is prepared in a two-step protocol. The proposed magnonic squeezed states find promising applications in quantum information processing and quantum sensing using magnons.
Radiometric characterization of daytime luminescent materials directly under the solar illumination
Authors: Valenta Jan , Fucikova Anna , Greben Michael , Khan Hassan Saeed , Paolini Riccardo , Garshasbi Samira , Santamouris Mat
Published: October 2024

The materials efficiently emitting photoluminescence (PL) under solar irradiation could find broad applications in passive radiative cooling of buildings, urban heat mitigation, and solar energy harvesting. In this work, we discuss the limitations of common laboratory characterization of such materials (using tunable light sources or solar simulators) and propose a methodology for direct outdoor characterization of PL efficiency under full solar irradiation. A simple, portable radiometry setup with an integrating sphere is described, and its capability of rapid determination of the spectral distribution of the absorbed and emitted power, as well as the overall PL power efficiency and quantum yield, is demonstrated. By characterization of three materials developed for daytime radiative cooling applications, we reveal deviations of obtained parameters caused by the replacement of the real solar irradiation by that of solar simulators. The described method is suitable for studies of long-term stability, photo-induced degradation, or thermal effects.
Offline L2-English relative clause attachment preferences
Authors: Atiles Amy Yuiko
Published: October 2024

This paper adds to the debate on second language (L2) relative clause (RC) attachment preferences
by investigating offline L2-English preferences by first-language (L1) speakers of Japanese, which has strong
head-finality and free word order (Ito et al., 2021; Kamide & Mitchell, 1998; Yamada et al., 2017). A
forced-choice task tested L1-English and L1-Japanese/L2-English speakers with RCs that were pragmatically
disambiguated to bias high or low attachment or had neutral bias. The L2 group’s high-attachment preference across all
conditions compared to L1-English speakers was statistically significant. No L2 proficiency no effects were found. As
English and Japanese are predicted to be influenced by the competing parsing principles of Recency and Predicate
Proximity, respectively, these results suggest that attachment preferences are transferrable to the L2.
Update of the BIPM comparison BIPM.RI(II)-K1.Cs-137 of activity measurements of the radionuclide 137Cs to include the 2014 result of the NRC (Canada) and the 2018 result of the TENMAK-NÜKEN (Türkiye)
Authors: Michotte Carine , Coulon Romain , Courte Sammy , Nonis Manuel , Judge Steven , Ratel G , Galea R , Moore K , Yeltepe E , Dirican A
Published: October 2024

Main text

Since 1976, 23 laboratories have submitted 45 samples of 137Cs to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Cs-137. The NRC (Canada) and the TENMAK-NÜKEN (Türkiye) participated in the comparison and the key comparison reference value (KCRV) has been updated.

The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the COOMET.RI(II)-K2.Cs-137 comparison and the updated KCRV have been calculated and the results are given in the form of a table. A graphical representation is also given.

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Final report on supplementary comparison of national standards in the field of flow and mass of liquid within the flow range of 0.1 t/h to 45 t/h
Authors: Tuhvatullin Albert , Alexander Bardonov , Zygmantas Gediminas , Benková Miroslava , Viktor Grushka , Narodnitsky Gennady , Davletyarov Nurlan
Published: October 2024

Main text

The purpose of this project is to carry out a comparison in the field of liquid flow measurement between the laboratories, members of the Technical Committee TC 1.4 "Flow measurement" of the COOMET regional metrological organization with the participation of a laboratory, member of the EURAMET regional metrological organization in order to establish the degree of equivalence of national standards and evaluate the calibration and measurement capabilities of the laboratories of national metrological institutes in the field of fluid flow. The comparison is carried out within the liquid mass flow range of 0.1 t/h to 45 t/h.

This report describes the comparison results of the following NMIs water flow facilities: VNIIM (Kazan, Russia) - pilot lab, BelGIM (Minsk, Belarus), LEI (Kaunas, Lithuania), CMI (Brno, Czechia), MD (Chisinau, Moldova), NSC Institute of Metrology (Kharkiv, Ukraine), RSE "KazInMetr" (Uralsk, Kazakhstan).

Three mass flow meters were used as a transfer standard: flow meter DN 6 in the flow range from 0.1 t/h to 1.0 t/h, flow meter DN 15 in the flow range from 1 t/h to 5 t/h, flow meter DN 50 in the flow range from 5 t/h to 45 t/h. All calibrations were made during October 2019 until September 2021.

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Prediction of ground state charge radius using support vector regression
Authors: Jalili Amir , Chen Ai-Xi
Published: October 2024

We systematically investigate the prediction of nuclear charge radii using a support vector regression (SVR) model in machine learning(ML), specifically employing a radial basis function (RBF) kernel. Our model is designed to capture the global structure of the radius surface through the utilization of feature spaces encompassing both (N, Z) and (N, Z, A). We achieved a root mean square deviation of 0.019 fm with respect to 885 measured charge radii (Z

⩾

8). By incorporating the atomic mass number as an additional feature, the model successfully reproduces the charge radii of (

40
−
50

Ca), (

74
−
96

Kr), (

120
−
148

Ba), and (

183
−
199

Au) isotopes. Furthermore, our ML method demonstrated an extrapolation capability with a deviation of 0.016 fm relative to 10 022 calculated charge radii based on the Weizsacker–Skyrme model. The SVR model’s performance is further tested across different regions of the charge radii table, demonstrating significant agreement with experimental data and underscoring the efficacy of the RBF kernel in nuclear charge radii prediction.
Cosmology in f (R, T) modified gravity : unified dark matter and dark energy model constrained by current observations
Authors: Bandyopadhyay Mayukh , Biswas Ritabrata
Published: October 2024

The proposed cosmological model deals with modified Chaplygin gas (MCG) in f(R, T) = R + ξ(T) gravity, where R is the Ricci Scalar and T is the trace of energy-momentum tensor. The function ξ(T) is chosen as the linear combination of power law and logarithmic form under flat Friedmann-Lemaitre-Robertson-Walker space-time. The model is compatible with current observational data (Pantheon Type Ia Supernova) and confronts the deceleration and state parameters effectively. The model can predict the Big Rip in future infinity and can also tackle the difficulties related to the fine-tuning and the coincidence problem practically. Further, we have numerically solved the modified Friedmann equations in f(R, T) gravity and also performed a Markov Chain Monte Carlo analysis to obtain the best fit parameters of this current cosmological model. These best parameters are then used to compute the cosmographic parameters, i.e., the deceleration parameter, the jerk parameter and the snap parameter. Significantly, the cosmographic test has given valuable insights into the dynamics of the current cosmological model and also enriched us to understand about the cosmic evolution of the accelerated Universe. Additionally, the Statefinder diagnostics and O

m
diagnostics have provided deeper insights into the dynamics of the cosmic expansion and also provided information to distinguish between both the cosmological frameworks. Furthermore, these tests also reveal that at late times, the current model goes beyond the phantom region. Again, the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) have provided enough support for the current model under consideration, indicating that the present model exhibits a plausible explanation. However, the ΛCDM model has emerged with the lowest AIC value which suggests its relatively superior fit compared to the current model. Finally, our current model aligns well with several recent observations and unveils various intriguing features about the late time accelerated Universe.
Novel energy exchange behaviors and mechanisms in nonlinear acoustic metamaterials with multiple nonlinear resonators
Authors: Zhou Fujian , Liu Mao
Published: October 2024

Wave-wave interactions in a nonlinear metamaterial or structure with two propagating waves can induce energy exchange within the nonlinear systems. The effects of nonlinear resonators on these interactions and energy exchanges in a nonlinear acoustic metamaterial have not been extensively studied in the literature. In this paper, a nonlinear monatomic acoustic metamaterial with multiple nonlinear resonators (NMAM-MNR) is constructed to investigate the new behaviors and mechanisms introduced by these nonlinear resonators. Stability analyses reveal that stability can be tuned by adjusting the number of nonlinear resonators and by selecting different intensities or masses of the resonators and the chain. Additionally, direct numerical simulations are performed to study the novel energy exchange behaviors and mechanisms in NMAM-MNR systems. The results demonstrate that the degree and frequency of energy exchange can be tuned by altering the mass ratios, stiffness ratios, intensities, and natural frequencies of the nonlinear resonators and the chain. The influence of mass and stiffness ratios on the time taken for the B-wave magnitude to first reach its maximum value in NMAM-MNR systems is also studied, showing that the rate of energy exchange induced by wave-wave interactions can be tuned by changing the stiffness and mass ratios of multiple nonlinear resonators. These properties have potential applications in the fields of energy harvesters, waveguides, and resonant energy transfer mechanisms.
Spin dynamics of 2-DEG Rashba-Dresselhaus spin-orbit systems: quantum propagators and semi-analytical analysis in low electron density
Authors: Bravo-Velazquez C A , Lastras-Martínez L F , Herrera-Serna D U , Martínez-Zepeda G A
Published: October 2024

The spin dynamics in space and time for Dresselhaus and Rashba spin-orbit interaction 2-DEG systems can be studied for any value of their β and α coefficients by using quantum propagators. With the development of analytical expressions for the quantum propagators and numerical solutions of the wave function, it has been possible to simulate the spin propagation in space-time and analyze the spin dynamics for different α/β ratios. In the present paper, the effects of the spin diffusion for large collision time τ

p
, was performed by using quantum propagators for different α/β ratios. It was found that the largest degree of spin polarization is achieved when ∣α∣ = ∣β∣.
Enhanced performance of GaN based VCSELs through graded electron-blocking layer design
Authors: Haider Syed Kashan , Rehman Hameed Ur , Wang Fang , Liu Yuhuai
Published: October 2024

Electron leakage from the active region to the p-type region restricts the performance of GaN-based Vertical-Cavity Surface-Emitting Lasers (VCSELs). AlGaN EBL can decrease the leakage current, but also raises the hole injection barrier and reduce the hole injection efficiency. Then, it is important to design EBL structures that can enhance both electron blocking and hole injection. In this study, VCSEL devices with three different EBL, basic structure Al0.6Ga0.4N EBL labeled as Device A, newly proposed 16 nm thick Al0.75–0.80Ga0.25–0.20N EBL labeled as Device B, and 18 nm thick Al0.75–0.80Ga0.25–0.20N EBL labeled as Device C, respectively, are designed and analyzed using PICS 3D simulation. Device A represents a basic VCSEL structure, while Device C incorporates a graded electron-blocking layer (EBL) with adjusted thickness. Through simulation results, it is observed that the introduction of a graded EBL in Device C leads to significant performance enhancements compared to the basic structure of Device A. Specifically, the graded EBL effectively reduces band bending and increases the electron barrier height, thereby improving carrier confinement and reducing electron leakage. Additionally, the utilize of a Graded structure in Device C aids in strain relief at the layout between the QB and EBL, resulting in improved electron-blocking capability and potentially enhanced hole transport characteristics. These findings underscore the importance of EBL grading in optimizing the performance of VCSELs, highlighting its potential for advancing the efficiency and functionality of these semiconductor devices. Power of the device C is being improved upto 4.16%, similarly the conduction band barrier height is improved upto 26.6% which is beneficial for better VCSEL performance as it enhances electron confinement in the active region, leading to increased efficiency and reduced carrier leakage and valance band barrier height decreases upto 6.52% and threshold current is decreased upto 4.8% so if valence band barrier height decrease the hole injection efficiency increases and if threshold current decreases the emitting power of the device increase.