bluuebunny/crossref_metadata_2025_split huggingface dataset:
Shifts of finite type on locally finite groups
Authors: RAYMOND JADE 
Published: February 2024

AbstractIn this work we prove that every shift of finite type (SFT), sofic shift, and strongly irreducible shift on locally finite groups has strong dynamical properties. These properties include that every sofic shift is an SFT, every SFT is strongly irreducible, every strongly irreducible shift is an SFT, every SFT is entropy minimal, and every SFT has a unique measure of maximal entropy, among others. In addition, we show that if every SFT on a group is strongly irreducible, or if every sofic shift is an SFT, then the group must be locally finite, and this extends to all of the properties we explore. These results are collected in two main theorems which characterize the local finiteness of groups by purely dynamical properties. In pursuit of these results, we present a formal construction offree extensionshifts on a groupG, which takes a shift on a subgroupHofG, and naturally extends it to a shift on all ofG.
On the lack of compactness in the axisymmetric neo-Hookean model
Authors: Barchiesi Marco , Henao Duvan , Mora-Corral Carlos , Rodiac Rémy 
Published: February 2024

Abstract
We provide a fine description of the weak limit of sequences of regular axisymmetric maps with equibounded neo-Hookean energy, under the assumption that they have finite surface energy. We prove that these weak limits have a dipole structure, showing that the singular map described by Conti and De Lellis is generic in some sense. On this map, we provide the explicit relaxation of the neo-Hookean energy. We also make a link with Cartesian currents showing that the candidate for the relaxation we obtained presents strong similarities with the relaxed energy in the context of

$\mathbb {S}^2$

-valued harmonic maps.
“Side by Side with Fighting Nations”: Making the New Culture of Pro-African Solidarity in the Campaigns of the Czechoslovak Committee for Solidarity with African and Asian Peoples
Authors: Buzássyová Barbora 
Published: February 2024

AbstractThe article analyses the solidarity campaigns organized by the Czechoslovak Committee for Solidarity with African and Asian Peoples between the 1960s and 1980s. It situates the Czechoslovak solidarity towards African countries in the wider framework of the solidarity politics of the Eastern bloc and points out differences as well as similarities. Although the Czechoslovak Solidarity Committee was one of the first such committees to be founded in Eastern Europe, in the 1960s its official as well as public commitment to internationalist principles was modest compared with those of solidarity movements elsewhere in the bloc. However, the solidarity campaigns with African liberation movements intensified in the early 1970s. The campaigns in this period were marked by strong national symbolism, which drew on historical parallels between the African and Czechoslovak struggles for independence. The everyday internationalism in this case filled the public space with images of shared suffering, inferiority, and occupation, through which Czechoslovak citizens made sense of their historical role in the world. The article argues that this “nationalization” of official solidarity campaigns helped to embed the victimization narratives that survived the Velvet Revolution and that, in the 1990s, became a basis for new Czech and Slovak political identification.
Frontline Citizens: Liberation Movements, Transnational Solidarity, and the Making of Anti-Imperialist Citizenship in Tanzania
Authors: Burton Eric 
Published: February 2024

AbstractThis article explores the intricate relationship between transnational solidarity and citizenship in socialist Tanzania, renowned for its extensive and enduring support of liberation movements from the 1960s to the 1980s. Termed “frontline citizenship”, this unique political subjectivity, evolving in the 1960s, was shaped not only by Tanzania's geopolitical location, nationalist struggles against colonialism, and government efforts to instil attitudes of anti-colonial solidarity in the population, but also by initiatives of hosted liberation movements, Tanzanians’ embrace of global anti-imperialist currents from Cuba to China and Vietnam, and critiques of politicians in exile. The article highlights the gendered and generational aspects of the solidarity regime, scrutinizes contested material solidarities, and discusses the partial decline of the frontline citizenship discourse. It does so by investigating the role of media, the impact of the paramilitary National Service, and the dynamics of material support practices. Drawing on multi-archival research, interviews, memoirs, and secondary literature, with a focus on South Africa's African National Congress (ANC), the analysis challenges conventional views of state-sponsored solidarity, emphasizing the dynamic interplay between state initiatives and grassroots participation as well as “external” and “internal” actors. Conceiving socialist Tanzania's solidarity regime in this way contributes to a broader understanding of the intersection between anti-imperialist world-making, nationalist state-building, and everyday performances of citizenship.
Minke whale entanglement in static fishing gear: identifying consistent areas of high risk in Western Scotland
Authors: Rayner Jessica , Embling Clare B. , Ryan Conor , Hartny-Mills Lauren 
Published: February 2024

Abstract
Entanglement in static fishing gear is the largest cause of non-natural mortality for minke whales (Balaenoptera acutorostrata) in Scottish waters. To mitigate whale entanglement, one priority is to identify areas where the risk of entanglement is consistently high. Sightings data for minke whales and creel fleets were collected by the Hebridean Whale and Dolphin Trust, during vessel line transect surveys conducted between 2008 and 2014. Habitat modelling was used to relate survey, environmental, and temporal variables to the co-occurrence of minke whales and creels in coastal waters of western Scotland. This revealed that minke whale occurrence was related to depth, peaking around 70 m. Using predictive habitat modelling, the overlap between minke whale habitat and the creel fishery was measured as risk of entanglement. A method was developed to quantify the consistency of risk over the seven-year time period. This allowed for the identification of areas where there had been a consistently low, medium, or high risk of entanglement from 2008 to 2014. The three areas with a consistent high risk of entanglement were identified: Inner Sound and Sound of Raasay, east of North and South Uist, and north of The Small Isles. The method presented here could be used to guide management to areas where mitigation efforts will be the most consistently effective over time.
Safe and socially compliant robot navigation in crowds with fast-moving pedestrians via deep reinforcement learning
Authors: Feng Zhen , Xue Bingxin , Wang Chaoqun , Zhou Fengyu 
Published: February 2024

AbstractSafe and socially compliant navigation in a crowded environment is essential for social robots. Numerous research efforts have shown the advantages of deep reinforcement learning techniques in training efficient policies, while most of them ignore fast-moving pedestrians in the crowd. In this paper, we present a novel design of safety measure, named Risk-Area, considering collision theory and motion characteristics of different robots and humans. The geometry of Risk-Area is formed based on the real-time relative positions and velocities of the agents in the environment. Our approach perceives risk in the environment and encourages the robot to take safe and socially compliant navigation behaviors. The proposed method is verified with three existing well-known deep reinforcement learning models in densely populated environments. Experiment results demonstrate that our approach combined with the reinforcement learning techniques can efficiently perceive risk in the environment and navigate the robot with high safety in the crowds with fast-moving pedestrians.
L’apprentissage du vocabulaire en français L2 avec Netflix : effet des activités de pré-/post-visionnage
Authors: Suter Lea , Berthele Raphael , Thomas Anita 
Published: February 2024

RésuméLes inputs audiovisuels tels que les films et les séries sont de plus en plus souvent utilisés dans les cours de langue étrangère (LE) car ils permettent une exposition authentique à la langue. Plusieurs études suggèrent qu’ils soutiennent l’apprentissage de nouveaux mots, mais que l’inclusion d’activités de pré-/post-visionnage pourrait renforcer cet apprentissage. La présente étude a été menée en Suisse alémanique et s’intéresse à l’effet de la présence et du placement d’une telle activité sur l’apprentissage de 51 mots cibles. Dans une étude within-design, 97 apprenants de français langue étrangère de 13–14 ans ont regardé trois extraits de la série télévisée « Plan Cœur » (Netflix, 2018). Les trois conditions étaient : épisode seul, épisode et activité avant, épisode et activité après. Les activités portaient sur la reconnaissance du sens des mots cibles. Trois post-tests immédiats et un post-test différé du même type (reconnaissance de sens) ont été effectués auprès des quatre classes de niveau scolaire supérieur (classes générales et prégymnasiales/GPG) et des deux classes de niveau scolaire inférieur (classes à exigences de base/EBA). Nos résultats confirment la supériorité des conditions avec activité ainsi qu’une différence (peu surprenante) selon le niveau scolaire. On trouve aussi une interaction entre le moment de test et condition avec plus de réponses correctes aux post-tests immédiats. La différence entre activité pré et post est cependant négligeable. Ces résultats soulignent l’importance des activités pré-/post-visionnage pour l’apprentissage de nouveaux mots en LE.
Enhancing self-esteem in adults with body dysmorphic symptoms: experimental testing and initial evaluation of a brief internet-based training
Authors: Bosbach Katharina , Martin Alexandra , Stricker Johannes , Schoenenberg Katrin 
Published: February 2024

AbstractBackground:Low self-esteem is an important factor associated with body dysmorphic concerns. In treatment, self-esteem cannot always be adequately addressed. Internet-based interventions offer a low-threshold and cost-efficient possibility for treating body dysmorphic disorder (BDD).Aims:For this reason, we conducted two studies to explore the effectiveness of an internet-based intervention targeting improving self-esteem in adults with BDD symptoms.Method:The first study investigated the differential effects of a 1-week self-esteem training compared with a 1-week attention-focus training. Two hundred twenty adults with elevated body dysmorphic symptoms were randomly assigned to one of the two trainings. Our second study (n = 58 adults with body dysmorphic symptoms) evaluated an extended 2-week stand-alone self-esteem training.Results:In the first study, self-esteem in different domains (appearance, performance and social), self-focused attention, and BDD symptom severity improved in both groups. Other-focused attention only increased in the attention training group. Participants’ overall adherence was high. In the second study we observed significant improvements in self-esteem, BDD symptom severity, and other secondary outcomes, with additional improvements in most outcomes in the second week. Adherence was again high.Conclusions:Together, these findings show that a brief internet-based intervention may be a highly accepted and effective way of improving self-esteem in people suffering from BDD symptoms.
ACTIVE REMODELLING OF TISSUES TO DESCRIBE BIPHASIC RHEOLOGICAL RESPONSES
Authors: GERMANO DOMENIC P. J. , KHUU STEPHANIE , JENNER ADRIANNE L. , OSBORNE JAMES M. , MYERSCOUGH MARY R. , FLEGG MARK B. 
Published: February 2024

AbstractTissues form from collections of cells that interact together mechanically via cell-to-cell adhesion, mediated by transmembrane cell adhesion molecules. Under a sufficiently large amount of induced stress, these tissues can undergo elastic deformation in the direction of tension, where they then elongate without any topological changes, and experience plastic deformation within the tissue. In this work, we present a novel mathematical model describing the deformation of cells, where tissues are elongated in a controlled manner. In doing so, the cells are able to undergo remodelling through elastic and then plastic deformation, in accordance with experimental observation. Our model describes bistable sizes of a cell that actively deform under stress to elongate the cell. In the absence of remodelling, the model reduces to the standard linear interaction model. In the presence of instant remodelling, we provide a bifurcation analysis to describe the existence of the bistable cell sizes. In the case of general remodelling, we show numerically that cells within a tissue may populate both the initial and elongated cell sizes, following a sufficiently large degree of stress.
Exhumed Serpentinites and Their Tectonic Significance in Non‐Collisional Orogens
Authors: Donoso‐Tapia Damián , Flores Kennet E. , Martin Celine , Gazel Esteban , Marsh Jeffrey 
Published: February 2024

AbstractExhumed serpentinites are fragments of ancient oceanic lithosphere or mantle wedge that record deep fluid‐rock interactions and metasomatic processes. While common in suture zones after closure of ocean basins, in non‐collisional orogens their origin and tectonic significance are not fully understood. We study serpentinite samples from five river basins in a segment of the non‐collisional Andean orogen in Ecuador (Cordillera Real). All samples are fully serpentinized with antigorite as the main polymorph, while spinel is the only relic phase. Watershed delineation analysis and in‐situ B isotope data suggest four serpentinite sources, linked to mantle wedge (δ11B = ∼−10.6 to −0.03‰) and obducted ophiolite (δ11B = −2.51 to +5.73‰) bodies, likely associated with Triassic, Jurassic‐Early Cretaceous, and potentially Late Cretaceous‐Paleocene high‐pressure (HP)–low‐temperature metamorphic sequences. Whole‐rock trace element data and in‐situ B isotopes favor serpentinization by a crust‐derived metamorphic fluid. Thermodynamic modeling in two samples suggests serpentinization at ∼550–500°C and pressures from 2.5 to 2.2 GPa and 1.0–0.6 GPa for two localities. Both samples record a subsequent overprint at ∼1.5–0.5 GPa and 680–660°C. In the Andes, regional phases of slab rollback have been reported since the mid‐Paleozoic to Late Cretaceous. This tectonic scenario favors the extrusion of HP rocks into the forearc and the opening of back‐arc basins. Subsequent compressional phases trigger short‐lived subduction in the back‐arc that culminates with ophiolite obduction and associated metamorphic rock exhumation. Thus, we propose that serpentinites in non‐collisional orogens are sourced from extruded slivers of mantle wedge in the forearc or obducted ophiolite sequences associated with regional back‐arc basins.
Investigating Subglacial Water‐Filled Cavities by Spectral Analysis of Ambient Seismic Noise: Results on the Polythermal Tête‐Rousse Glacier (Mont Blanc, France)
Authors: Guillemot A. , Bontemps N. , Larose E. , Teodor D. , Faller S. , Baillet L. , Garambois S. , Thibert E. , Gagliardini O. , Vincent C. 
Published: February 2024

AbstractPolythermal glaciers can trap considerable volumes of liquid water with the potential to generate devastating outburst floods. This study aims to identify water‐filled subglacial reservoirs from ambient seismic noise collected by moderate‐cost surveys. The horizontal‐to‐vertical spectral ratio technique is highly sensitive to impedance contrasts at interfaces, thus commonly used to estimate glacier thickness. Here, we focus on the inverse ratio, that is, the V/H spectral ratio (VHSR), whose high values indicate a low impedance volume beneath the surface, suggesting subglacial cavities. We analyze VHSR peaks from a seismic array of 60 nodes installed on the Tête‐Rousse Glacier (Mont Blanc massif, French Alps); data were gathered over 15 days. Mapping the VHSR amplitude over the free surface reveals the main cavity locations and the basal areas affected by melting within the glacier. Results obtained in the field are supported by a conceptual model based on 3D finite‐element simulations.
Earth's Free Surface Complicates Inference of Absolute Stress From Earthquake‐Induced Stress Rotations
Authors: Hardebeck Jeanne L. 
Published: February 2024

AbstractThe stress redistribution from an earthquake can produce localized measurable rotations of the principal stress axes if the absolute level of differential stress in the crust is on the order of the earthquake stress drop. Two simple analytic solutions have been developed to estimate the differential stress from an observed stress rotation. However, each has assumptions that may not be accurate near Earth's free surface. I model synthetic earthquakes in an elastic half‐space, and show that the assumptions of the methods are accurate for strike‐slip earthquakes, and for deep dip‐slip earthquakes. However, they are incorrect for shallow dip‐slip earthquakes. I introduce a free surface correction for one of the methods for dip‐slip earthquakes. I revise an analysis of stress rotations due to great subduction zone earthquakes, including this correction. The results support the original conclusion of near complete stress drop for many shallow subduction zone earthquakes.
Marine Fuel Regulations and Engine Emissions: Impacts on Physicochemical Properties, Cloud Activity and Emission Factors
Authors: Santos L. F. E. D. , Salo K. , Kong X. , Hartmann M. , Sjöblom J. , Thomson E. S. 
Published: February 2024

AbstractMarine regulations aim to reduce sulfur and nitrogen exhaust emissions from maritime shipping. Here, two compliance pathways for reducing sulfur dioxide emissions, fuel sulfur content reduction and exhaust wet scrubbing, are studied for their effects on physicochemical properties and cloud forming abilities of engine exhaust particles. A test‐bed diesel engine was utilized to study fresh exhaust emissions from combustion of non‐compliant, high sulfur content fuel with (WS) and without (HiS) the usage of a wet scrubber as well as a regulatory compliant, low sulfur content fuel (LoS). Particle number emissions are decreased by ≈99% when switching to LoS due to absence of 20–30 nm sulfate rich particles. While number emissions for WS are also decreased, a shift in the sulfate mode toward larger sizes was found to increase particle mass emission factors by at least 31%. Changes in the mixing state induced by the compliance measures are reflected in the hygroscopicity of the exhaust particles. Fuel sulfur reduction decreased cloud condensation nuclei emissions by at least 97% due to emissions of primarily hydrophobic soot particles. Wet scrubbing increased those emissions, mainly driven by changes in particle size distributions. Our results indicate that both compliance alternatives have no obvious impact on the ice forming abilities of 200 nm exhaust particles. These detailed results are relevant for atmospheric processes and might be useful input parameters for cloud‐resolving models to investigate ship aerosol‐cloud interactions and to quantify the impact of shipping on radiative budgets from local to global scales.
Alternating Conditional Expectations: Introducing a Non‐Parametric Statistical Method to Interpret Long‐Term Greenhouse Gas Flux Measurements Over Semi‐Arid and Wetland Ecosystems
Authors: Baldocchi Dennis D. , Arias Ortiz Ariane 
Published: February 2024

AbstractWe explore the potential of using a non‐parametric statistical method called Alternating Conditional Expectations, ACE, to quantify functional relationships in biogeosciences. Here, ACE is used to quantify the non‐linear and multi‐faceted responses of greenhouse gas fluxes to a set of biophysical forcings, when the shapes of those response surfaces are unknown. We evaluated the statistical method over two contrasting ecosystems and two contrasting time steps. One case involved quantifying the biophysical controls of water vapor and carbon dioxide (CO2) fluxes over a semi‐arid oak savanna using daily integrated fluxes. The other case evaluated the responses of CO2 and methane (CH4) flux measurements to a set of biophysical forcings at a restored tidal wetland using thirty‐minute averages. The statistical model, based on 4 independent variables, explained up over 90% of the variation in daily integrated flux densities of water vapor and net carbon dioxide exchange at the savanna site. This fit was defined by distinct non‐linear responses to such drivers as gross primary production, photosynthetically active radiation, air temperature, vapor pressure deficit and soil moisture. At the tidal wetland site, we evaluated net carbon dioxide and methane fluxes with short‐term measurements to capture the influence of rising and falling tides and seasonality in biological activity. The statistical model defined the shape of the forcing of fluxes due to the roles of carbon exudates, water table depth, oxygen level in the water column, temperature and vegetation status. The statistical fits of the greenhouse gas fluxes were less precise than the savanna case. The fetch varies on a run‐to‐run basis as it is comprised of a heterogeneous mosaic of open water and vegetation. Furthermore, it is difficult to monitor the environmental conditions of the archaea and bacteria in the sediments that produce methane and carbon dioxide.
Observations of Geomagnetic Crochet at High‐Latitudes Due To X1.5 Class Solar Flare on 3 July 2021
Authors: Rao S. S. , Srivastava Nandita , Chakraborty Monti , Kumar Sandeep , Chakrabarty D. 
Published: February 2024

AbstractOn 3 July 2021, an X1.5 solar flare from the National Oceanic and Atmospheric Administration solar Active Region AR12838 (24°N, 88°W) occurred at 14:18 UT, peaked at 14:29 UT, and decayed at 14:34 UT. The study of this X1.5 solar flare is significant due to its unique geomagnetic crochet feature at high latitudes and its effective signature on Earth. The study examined X‐rays, the extreme ultraviolet spectrum, ionospheric equivalent current (IEC), and geomagnetic field components. The study reveals a sudden increase in IEC during the X1.5 flare episode, forming a zonal current region and producing a geomagnetic crochet signature in geomagnetic field components at high latitudes (50°–80°N) along the 11°–26°E longitude sector during the flare peak time. All three geomagnetic field components show different sensitivity to the solar flare effect (sfe), and the amplitude and phase of the geomagnetic crochet across latitudes (for a given longitude) are consistent with the variations in the IEC. The present study is the first to appraise geomagnetic crochets of low magnitude (8–40 nT) and short duration (10–15 min) at high latitudes, particularly in the polar cusp region, during the X‐class limb flare.