bluuebunny/crossref_metadata_2025 huggingface dataset:
Strukturierte Analyse eines sozial-mathematischen Netzwerks – Der Briefwechsel zwischen Hermann Minkowski, David Hilbert und Adolf Hurwitz
Authors: Oswald Nicola M. R.
Published: October 2024

In diesem Beitrag wird zunächst der Briefwechsel zwischen den Mathematikern Adolf Hurwitz (1859–1919), David Hilbert (1862–1943) und Hermann Minkowski (1864–1909) im Allgemeinen vorgestellt. Anschließend werden erste Ergebnisse einer strukturierten Analyse des Briefwechsels gebracht und anhand von zwei qualitativen Beispielen der kollaborative Austausch der drei Kollegen und Freunde in den Blick genommen. Anhand von ausgewählten Briefen rund um zwei Transzendenzbeweise der Eulerschen Zahl e von 1893 sowie durch Briefe und Postkarten mit Bezug auf die Rede, die Hilbert beim Internationalen Mathematikerkongress in Paris 1900 hielt und die später in ihrer gedruckten Version weltberühmt wurde, werden Charakteristika ihres Austausches herausgestellt. Insgesamt entsteht ein Bild von einer vielseitigen gegenseitigen Förderung und einem gemeinsamen wissenschaftlichen Diskurs, der einen Einblick in die zeitgenössische mathematische Community gewährt.
MATERIAL LOKAL DAN RAMAH LINGKUNGAN: INOVASI DALAM PERANCANGAN INTERIOR DENGAN INSPIRASI BUDAYA OSING
Authors: Dini Mazaya , Aldila Yuanditasari
Published: October 2024

Dependence on nature should encourage people to build systems that utilize nature as a life-support system. Increased awareness of environmental and sustainability issues emphasizes the importance of environmentally friendly industrial practices. The Osing community is known for its tourism and handicrafts, including abaca fiber and bamboo weaving. This research delves deeper into the cultural customs of the Osing tribe that can be identified, utilized, and developed in interior design so as to create an interior design with local cultural wealth and sustainable use of local materials as a design foundation. Using a descriptive qualitative method, it was found that the materials and handicrafts typical of the Osing tribe can be youthfully utilized to enrich interior design with diverse aesthetic elements, but also to produce functional products that reflect the cultural identity of the Osing tribe. This research is useful in showing how the use of local materials such as abaca fiber and bamboo by the Osing people in Banyuwangi Regency can create continuity between local tradition, sustainability and creativity. As such, the results of this research support the application of sustainable materials and the integration of local cultural elements in interior design, contributing to environmental preservation and local economic development.
Influence of School Feeding Programs on Students’ participation in Sports Activities in Ilala District Council, Tanzania
Authors: Mtambo Elizabeth , Omer Solomon
Published: October 2024

This study investigated the influence of school feeding programs on students’ sports activities in Ilala District. It was conducted to examine primary school pupils’ participation in sports before the introduction of feeding programs, to determine the relationship between school feeding programs and pupils’ participation in sports in primary schools, and to highlight improvements in students’ participation in sports activities after the introduction of school feeding programs in primary schools in Ilala District. The study employed a convergent research design under a mixed research approach. A sample of 168 respondents, including head teachers, sports teachers, and pupils purposefully chosen from selected primary schools in Ilala District were involved in the study. Data were gathered by using questionnaires, interviews, and focus group discussions. The quantitative data were analysed by using descriptive statistics with the help of SPSS version 25 while the qualitative data were analysed thematically. The results showed that the school feeding programs enhance students' physical fitness for sports activities. It was revealed that, before the introduction of the feeding programs, students' participation in sports was low as many of them were inactive and others found it difficult to participate due to the lack of food in their schools. Moreover, it was found that the introduction of feeding programs had positively changed students’ attitudes towards sports and improved their health and participation in sports. The study recommends that the authorities responsible for education have to make every possible effort to sustain and expand the feeding programs and establish special committees for effective management and monitoring to ensure that children get food in schools on a continuous basis.
Uso Óptimo de los Medios de Contraste en la Realización de Tomografías, en Neiva 2024
Authors: Yirliza Suarez Ingri , Castañeda Mayra Alejandra , Dayerly Martinez Sonia
Published: October 2024

Los medios de contraste son elementos cruciales en las ayudas diagnósticas modernas, ya que mejoran la percepción visual y centralizan la atención en áreas fisiológicas específicas, lo que facilita la elección de técnicas de imagenología. No obstante, es fundamental considerar criterios específicos para su adecuada implementación y optimización, garantizando un uso eficiente de este recurso. En este contexto, el objetivo de este estudio es diseñar una guía para el uso óptimo de los medios de contraste por parte de los tecnólogos en radiología durante la realización de tomografías en un entorno clínico específico de Neiva, Huila, en 2024. La investigación sigue una metodología cualitativa descriptiva de corte transversal, con un enfoque analítico basado en la revisión de literatura académica e investigativa existente, utilizando matrices de revisión bibliográfica según criterios de inclusión y exclusión, complementadas con tablas descriptivas para el procesamiento de datos.
Polifarmacia en el Adulto Mayor. Revisión Bibliográfica
Authors: Díaz Burgos Rocío del Carmen , Robles Calderón Javier Alejandro
Published: October 2024

El enfoque del tratamiento médico en los adultos mayores ha estado marcado por una tendencia a prescribir múltiples fármacos para abordar diversas comorbilidades. Sin embargo, esta práctica ha sido objeto de críticas debido a sus implicaciones potencialmente negativas, como interacciones medicamentosas adversas, efectos secundarios no deseados y un deterioro general en la calidad de vida. Con base a las implicaciones de la polifarmacia en la calidad y estilo de vida de las personas adultas mayores el objetivo de este documento fue proporcionar una visión integral sobre el impacto de la polifarmacia en el adulto mayor, analizando tanto sus consecuencias clínicas como sociales, mediante la revisión bibliográfica de documentos de elevada calidad científica y académica. Partiendo de ello, es claro que la polifarmacia se ha constituido en una práctica común en el proceso de salud enfermedad del adulto mayor debido a la presencia de múltiples comorbilidades crónicas. Sin embargo, esto puede aumentar el riesgo de reacciones adversas, interacciones medicamentosas y efectos secundarios, lo que puede afectar negativamente la calidad de vida del paciente. La adherencia al tratamiento es fundamental para minimizar los riesgos asociados con la polifarmacia en el adulto mayor, siendo importante que los pacientes sigan las indicaciones de los medicamentos y comuniquen cualquier cambio o efecto secundario a su médico, pues la no adherencia puede llevar a una reducción de la eficacia del tratamiento y un aumento del riesgo de reacciones adversas.
Impacto de la Vulnerabilidad Social en el Estado Nutricional de Niños Paraguayos
Authors: González de Lamas Alma , Valdés Nathalia , Armando Meza Gustavo , Chaux Alcides
Published: October 2024

Este estudio, llevado a cabo en la Unidad de Salud Familiar del Barrio Santa Ana en Ciudad del Este, analizó el estado nutricional y el nivel de vulnerabilidad de 62 niños de 0 a 23 meses. Reveló una preocupante prevalencia de desnutrición y riesgo nutricional, con un 23% de los niños en riesgo de desnutrición y un 15% en riesgo de talla baja, lo que indica una desnutrición crónica. La investigación destacó una correlación significativa entre la vulnerabilidad social y el estado nutricional, mostrando que las condiciones socioeconómicas adversas están directamente relacionadas con problemas nutricionales en niños. La desigualdad social emergió como un factor clave en la prevalencia de desnutrición crónica, especialmente en hogares de bajos ingresos y con acceso limitado a servicios básicos. Los hallazgos subrayan la importancia de intervenciones nutricionales tempranas y estrategias integrales que aborden tanto la alimentación como las condiciones de vida en comunidades vulnerables. Este estudio resalta la urgencia de acciones colectivas y políticas públicas enfocadas en mejorar la salud infantil y romper el ciclo de pobreza y malnutrición.
Propuesta de Plan De Manejo de Residuos Sólidos Urbanos Para la Comunidad de Máximo Rojas Xalostoc, en el Municipio De Tlaxco, Tlaxcala
Authors: Rodríguez López María de Jesús , Sánchez Meza Ana Lizette , Cruz Vázquez Nadia Angélica , Fuentes Vergara Erika
Published: October 2024

El presente artículo presenta la propuesta de un plan de manejo de residuos para la comunidad de Máximo Rojas Xalostoc, de Tlaxco, Tlaxcala, enfocado en la valorización de los mismos y la concientización de los habitantes de la comunidad en el tema.  Esta propuesta se elaboró con base a los resultados obtenidos de un diagnósticos previos, identificándose con ello volúmenes y tipos de residuos generados.  Con ello, se integró esta propuesta de plan de manejo de residuos que incluye barrido, segregación, recolección, transporte a sitio de transferencia, valorización y disposición final, la propuesta de construcción de una estación de transferencia y educación ambiental, difusión y comunicación del plan a los habitantes de la localidad.
De la Teoría a la Práctica: Implementación de Redes Neuronales en el Diseño de Políticas Públicas Efectivas
Authors: Vallejo-Rosero Christian Alirio , Tabarquino-Muñoz Víctor Hugo , Gaviria-Moreno Gerson Esteban , Tabarquino-Muñoz Raúl Andrés
Published: October 2024

Este artículo de revisión explora la implementación de redes neuronales en el diseño de políticas públicas, evaluando su impacto en la eficiencia, eficacia y sostenibilidad de las intervenciones gubernamentales. El objetivo es proporcionar una visión comprensiva de cómo estas tecnologías avanzadas pueden transformar la formulación de políticas y superar desafíos específicos. La metodología empleada sigue el enfoque PRISMA, incluyendo una exhaustiva búsqueda y análisis de estudios relevantes publicados entre 2010 y 2023. Se realizaron revisiones sistemáticas de la literatura para identificar aplicaciones de redes neuronales en áreas clave como gestión del tráfico, salud pública, educación y manejo de desastres. Los principales hallazgos revelan que las redes neuronales pueden mejorar significativamente la eficiencia operativa y la satisfacción ciudadana, al tiempo que contribuyen a la reducción de costos. No obstante, se identificaron desafíos críticos, como problemas técnicos, cuestiones éticas y barreras en la integración tecnológica. Este estudio subraya la necesidad de desarrollar estrategias para abordar estos desafíos y optimizar el uso de redes neuronales en el ámbito de las políticas públicas, ofreciendo recomendaciones para futuras implementaciones y estudios.
DNA Barcoding and New Records of Water Mites (Acari, Hydrachnidia) from Bosnia and Herzegovina
Authors: Pešić Vladimir , Jovanović Milica , Bańkowska Aleksandra , Dmitrović Dejan , Šukalo Goran , Kijevčanin Emina , Zawal Andrzej
Published: October 2024

During the last decade, DNA barcoding has become a widely applicated approach in the identification of water mite species. Still, our knowledge about the molecular diversity and number of DNA barcodes of water mite species that inhabit Bosnia and Herzegovina is limited. In this study a total of 50 mitochondrial barcode sequences were obtained from 18 water mite species collected in Bosnia and Herzegovina. Seven species, i.e. Sperchon violaceus Walter, 1944, S. milisai Pešić, 2022, Lebertia glabra Thor, 1897, L. reticulata (Koenike, 1919), Torrenticola lukai Pešić, Valdecasas & Garcia-Jimenez, 2012, Hygrobates turcicus Pešić, Esen & Dabert, 2017, and Arrenurus cylindratus Piersig, 1896 are added as new for the water mite fauna of Bosnia and Herzegovina. Our results revealed that all recorded water mite species in our study could be identified when we consider global and regional DNA barcode database.
Colour and COD Removal from Food and Beverages Industrial Wastewater by using Spent Alkalis Carbide Lime (SACL)
Authors: Mohd Zainuddin Nur Ain , Mohamad Ariffin Nur Izzati , Puasa Siti Wahidah
Published: October 2024

The abundant amount of water used in the food & beverages (F&B) industry has caused the wastewater from this industry to be one of the major sources of water pollution, due to its high content of colour and chemical oxygen demand (COD). In this study, spent alkalis carbide lime (SACL) was used in treating the colour and COD simultaneously from the F&B industrial wastewater. SACL was used to reduce the amount of landfill waste and because of its similar characteristic to lime. The SACL was characterized using X-ray Diffractometer (XRD) X-ray Fluorescence (XRF), Scanning Electron Microscope (SEM), and Fourier-Transform Infrared Spectroscopy (FTIR) while the F&B industrial wastewater was characterized by using HACH DR6000 and UV-Vis Spectrophotometers. Several series of chemical precipitation experiments were conducted through jar tests to evaluate the effects of SACL dosing, pH value, and contact time on the percentage removal of colour and COD. The optimum conditions obtained from this study are pH 7 and 20 minutes, with percentage removal of 99.5% and 89.8% for colour and COD. However, the percentage removal of colour and COD decreased as contact time increased. With the same value of pH and contact time, SACL managed to remove more colours compared to lime, which is 93.6% compared to 88.54%, respectively. According to the analyses of FTIR and UV-Vis, the wastewater sample was cleaner when using SACL compared to using lime during the treatment. Thus, the study proves that SACL is a reliable alternative to treat colour and COD from F&B industrial wastewater.
Improving used Lubricant Oil Burner Performance: Effect of Swirled Flow of Internally Distributor Type on the Combustion and Flue Gas Temperature and Emission
Authors: Silaban Robert , Simanjuntak Janter Pangaduan , Zainon Mohd Zamri
Published: October 2024

This study aimed to experimentally investigate the combustion characteristics of used lubricant oil (ULO). A simple cylindrical burner of the natural draft vaporizing type, equipped with an internal air distributor, was designed and fabricated to achieve this objective. The burner’s efficiency was evaluated based on combustion temperature, flue gas temperature, and concentration levels. The key feature of this burner lies in the swirled flow of air combustion and ULO vapor within the combustion chamber, facilitated by the swirled flow air distributor type. Various air-fuel ratios (ϕ), ranging from 0.5 to 4, were considered in characterizing the burner’s performance. The results revealed increased combustion and flue gas temperatures in the radial airflow types. The highest temperatures achieved using the radial flow type are 930 oC and 410 oC for combustion and exhaust gas temperature, respectively. In contrast, the combustion chamber and exhaust gas temperatures are 980 oC and 465 oC for the swirled flow type, respectively. It was found that there is a decrease in the emission of CO and CO2 by volume under optimum conditions. This decrement was attributed to the swirled flow effects, which promoted a better mixture of air combustion and ULO vapor during combustion.
Investigating Dual Inlet Cyclone Separator Performance: Effects of Vortex Finder Diameter, Shape, and Particle Diameter on Separation Efficiency and Pressure Drop
Authors: Barua Saikat , Mohideen Batcha Mohd Faizal , Mohd Amin Azriszul , Mohammed Akmal Nizam , Wae-hayee Makatar
Published: October 2024

The diameter and shape of the vortex finder of cyclone separator plays a significant role in separation efficiency and pressure drop. Currently, there have been many studies conducted on the shape and ratio of vortex finder of cyclone separator. This paper aims to compare numerical results of Raynold stress turbulence model RSM with K-ε RNG numerical analysis results and analyse the effect of further variation of the vortex finder diameter and shape of dual inlet cyclone separators. Five variation of vortex finder diameters namely 291mm, 310mm, 330mm, 348mm, and 366mm, four types of vortex finder shapes namely normal (cylindrical), spiral, divergent and spiral-divergent have been studied with different particle diameter and constant inlet velocity. The result obtained from this study suggests that increasing the vortex finder diameter have negative effect on separation efficiency. It also shows that increasing the vortex finder diameter consistently decrease the pressure drop. From the result, it is been found that the 291mm vortex finder has higher separation efficiency than the rest. Analysis with different vortex shapes, the spiral-divergent shape proved to be best in terms of separation efficiency.
A COLISÃO ENTRE A FUNÇÃO SOCIAL DO DIREITO E A LIBERDADE DE EXPRESSÃO NA ERA DIGITAL: UM CONVITE À PROPORCIONALIDADE
Authors: Kirk de Sanctis Júnior Rubens José
Published: October 2024

: O presente artigo visa analisar a aplicação do princípio da proporcionalidade como forma de compatibilizar o direito fundamental à liberdade de expressão com a função social do Direito, em especial na chamada Era Digital. Para isso, utiliza-se da metodologia dedutiva,fundamentando-se em revisão bibliográfica da doutrina, bem como análise da legislação e jurisprudência, nacionais e estrangeiras. No trabalho, inicialmente, são fixados aspectos conceituais e históricos acerca dos institutos da função social do Direito e da liberdade de expressão. Estabelece um panorama comparativo da proteção jurídica dada à liberdade de expressão nos Estados Unidos da América, Alemanha e Brasil, com base em julgamentos paradigmáticos proferidos pelas respectivas Cortes Constitucionais. Também aborda o conceito e possibilidades de aplicação do princípio da proporcionalidade. Por fim, os resultados obtidosdemonstram que o princípio da proporcionalidade pode ser utilizado como ferramenta jurídicaeficaz na solução desses dilemas inerentes à liberdade de expressão na sociedade contemporânea.
EFEITO DA MATERNIDADE NA CARREIRA FEMININA
Authors: Gonçalves Ariela Cristina , Vasconcelos Oliveira Caio
Published: October 2024

O estudo aborda o impacto da maternidade na carreira feminina, explorando questões sociais, jurídicas e econômicas. Destaca-se que mulheres com filhos enfrentam desafios significativos no mercado de trabalho, devido à discriminação, falta de políticas de conciliação entre trabalho e família, e desigualdade de gênero. Embora a licença-maternidade e a estabilidade no emprego sejam dispositivos legais existentes, nem sempre garantem proteção efetiva para as mulheres. O método utilizado para a pesquisa foi a revisão bibliográfica, na qual se realiza um estudo onde se busca semelhanças e diferenças entre as publicações levantadas na bibliografia de referência. A partir desta compilação de informações são reunidos conhecimentos a respeito da temática estudada, o que significa uma base adequada à um estudo significativo para o direito.O objetivo principal do estudo é investigar como a maternidade afeta a trajetória profissional das mulheres, analisando os obstáculos enfrentados por mães no mercado de trabalho e as implicações legais e sociais relacionadas à licença-maternidade e estabilidade no emprego.Conclui-se que há uma necessidade premente de políticas que promovam a equidade de gênero e apoiem mães trabalhadoras. Reconhece-se a importância de conciliar maternidade e vida profissional.
Systematic Literature Review and Bibliometric Analysis Seafarer Supply and Demand
Authors: Umasangadji Fahmi , Wijaya Rizki , Almuzani Nafi
Published: October 2024

This study conducts a systematic assessment of the literature and does a bibliometric analysis to investigate the fluctuations in the availability and need for seafarers in the marine sector. The study examines a diverse selection of publications from several subfields within the seafarer workforce domain, analysing significant patterns, difficulties, and opportunities for enhancement. The study provides insights into the scholarly landscape of seafarer workforce research by analyzing highly cited articles, prolific authors, and influential journals. The findings highlight the significant impact of technological advancements, demographic shifts, regulatory changes, and economic factors on seafarer supply and demand dynamics. The systematic review and bibliometric analysis offer valuable information for policymakers, industry stakeholders, researchers, and academicians seeking to understand and address the complexities of the seafarer workforce. The initial review of articles obtained from the pilot search informed the formulation of research questions to understand the current state, trends, impactful studies, influential authors, and areas for future exploration within the seafarer workforce literature. Keywords related to seafarers and workforce were identified and refined through a three-step process to create an optimal set of search terms. This systematic literature review has provided valuable insights into various aspects of the seafarer workforce, including trends, challenges, and potential areas for future research. By employing a rigorous methodology and analyzing relevant literature, this study contributes to the ongoing discourse on seafarer supply and demand dynamics, offering a foundation for informed decision-making and further exploration in this field.
The impact of the real interest rate on green investment: evidence from the United States
Authors: Van Den Engel Anouk , Swart Julia , Schramm Marc
Published: October 2024

Monetary policy has an impact on CO2 emissions which is not entirely understood in the literature. Whereas there is a consensus that the impact is indirect through investments, the literature does not investigate the impact of monetary policy on (green) investments. Additionally, we argue in this paper that monetary policy can have a different impact on ‘green’ investments and ‘brown’ investments. This paper focuses, therefore, on the impact of monetary policy on investments. In particular, this paper empirically investigates whether the real interest rate has a different effect on green investment, compared to general investment, using quarterly data from the United States between 2004 and 2020. The results from the autoregressive distributed lag model show that the real interest rate is negatively related to the ratio of green investment relative to total investment. This result emphasizes the importance of the green investment effect channel and suggests that monetary policy has an unintentional role in climate policy which should be considered by policy makers.
Anomaly Detection and Approximate Similarity Searches of Transients in Real-time Data Streams
Authors: Aleo P. D. , Engel A. W. , Narayan G. , Angus C. R. , Malanchev K. , Auchettl K. , Baldassare V. F. , Berres A. , de Boer T. J. L. , Boyd B. M. , Chambers K. C. , Davis K. W. , Esquivel N. , Farias D. , Foley R. J. , Gagliano A. , Gall C. , Gao H. , Gomez S. , Grayling M. , Jones D. O. , Lin C.-C. , Magnier E. A. , Mandel K. S. , Matheson T. , Raimundo S. I. , Shah V. G. , Soraisam M. D. , de Soto K. M. , Vicencio S. , Villar V. A. , Wainscoat R. J.
Published: October 2024

We present Lightcurve Anomaly Identification and Similarity Search (LAISS), an automated pipeline to detect anomalous astrophysical transients in real-time data streams. We deploy our anomaly detection model on the nightly Zwicky Transient Facility (ZTF) Alert Stream via the ANTARES broker, identifying a manageable ∼1–5 candidates per night for expert vetting and coordinating follow-up observations. Our method leverages statistical light-curve and contextual host galaxy features within a random forest classifier, tagging transients of rare classes (spectroscopic anomalies), of uncommon host galaxy environments (contextual anomalies), and of peculiar or interaction-powered phenomena (behavioral anomalies). Moreover, we demonstrate the power of a low-latency (∼ms) approximate similarity search method to find transient analogs with similar light-curve evolution and host galaxy environments. We use analogs for data-driven discovery, characterization, (re)classification, and imputation in retrospective and real-time searches. To date, we have identified ∼50 previously known and previously missed rare transients from real-time and retrospective searches, including but not limited to superluminous supernovae (SLSNe), tidal disruption events, SNe IIn, SNe IIb, SNe I-CSM, SNe Ia-91bg-like, SNe Ib, SNe Ic, SNe Ic-BL, and M31 novae. Lastly, we report the discovery of 325 total transients, all observed between 2018 and 2021 and absent from public catalogs (∼1% of all ZTF Astronomical Transient reports to the Transient Name Server through 2021). These methods enable a systematic approach to finding the “needle in the haystack” in large-volume data streams. Because of its integration with the ANTARES broker, LAISS is built to detect exciting transients in Rubin data.
Spectral Properties and the Influence of Coronal Mass Ejections in 3He-rich Solar Energetic Particle Events
Authors: Hart Samuel T. , Dayeh M. A. , Bučík R. , Mason G. M. , Desai M. I. , Ebert R. W. , Ho G. C. , Shmies A. A.
Published: October 2024

We analyze the spectral properties of 3He and 4He as well as the heavy ions (oxygen, neon, magnesium, silicon, and iron) in 80 3He-rich solar energetic particle (SEP) events observed by the Ultra-Low-Energy Ion Spectrometer on board the Advanced Composition Explorer spacecraft since its launch in 1997 until 2024. We split the spectral analysis into two criteria: events with fast and wide coronal mass ejections (CMEs; called “FW events”) and events with slow, narrow, or no observed CMEs (called “non-FW events”). Overall, we find that events with fast and wide CMEs exhibit more uniform spectra across all species, and their low-energy spectral indices are strongly correlated, suggesting a CME provides an additional reacceleration mechanism for the 3He-rich SEPs. When comparing each species’ low-energy spectral index for events with no associated fast-and-wide CME, we find a primary peak in the spectral hardness of 3He, and a secondary peak in Mg and Si. If we consider a plasma temperature of 1.0–1.3 MK, Mg and Si have a charge-to-mass ratio (Q/M) nearest to one-third (1/3), directly half that of 3He. Thus, our results support the results of Roth & Temerin, which suggest heavy ions resonate with the second harmonic of the same ion cyclotron waves energizing 3He. However, it is unclear why the Fe enhancement is not reflected in its spectral index, and we propose that additional acceleration and/or transport mechanisms are playing a role in the abundance enhancement of Fe and heavier ions.
Galactic-Seismology Substructures and Streams Hunter with LAMOST and Gaia. I. Methodology and Local Halo Results
Authors: Wang Guan-Yu , Wang Hai-Feng , Luo Yang-Ping , Ting Yuan-Sen , Tepper-García Thor , Bland-Hawthorn Joss , Carlin Jeffrey
Published: October 2024

We present a novel, deep-learning-based method—dubbed Galactic-Seismology Substructures and Streams Hunter, or GS3 Hunter for short—to search for substructures and streams in stellar kinematics data. GS3 Hunter relies on a combined application of Siamese neural networks to transform the phase space information and the K-means algorithm for the clustering. As a validation test, we apply GS3 Hunter to a subset of the Feedback in Realistic Environments (FIRE) cosmological simulations. The stellar streams and substructures thus identified are in good agreement with corresponding results reported earlier by the FIRE team. In the same vein, we apply our method to a subset of local halo stars from the Gaia Early Data Release 3 and GALAH DR3 data sets and recover several previously known dynamical groups, such as Thamnos 1+2, the hot thick disk, ED-1, L-RL3, Helmi 1+2, Gaia-Sausage-Enceladus, Sequoia, Virgo Radial Merger, Cronus, and Nereus. Finally, we apply our method without fine-tuning to a subset of K giant stars located in the inner halo region, obtained from the LAMOST Data Release 5 data set. We recover three previously known structures (Sagittarius, Hercules-Aquila Cloud, and the Virgo Overdensity), but we also discover a number of new substructures. We anticipate that GS3 Hunter will become a useful tool for the community dedicated to the search for stellar streams and structures in the Milky Way (MW) and the Local Group, thus helping advance our understanding of the stellar inner and outer halos and the assembly and tidal stripping history in and around the MW.
On the Dynamical Evolution of the Asteroid Belt in a Massive Star–Neutron Star Binary
Authors: Deng Chen , Huang Yong-Feng , Du Chen , Wang Pei , Dai Zi-Gao
Published: October 2024

Some fast radio bursts (FRBs) exhibit repetitive behaviors, and their origins remain enigmatic. It has been argued that repeating FRBs could be produced by the interaction between a neutron star and an asteroid belt. Here, we consider the systems in which an asteroid belt dwells around a massive star, while a neutron star, as a companion of the massive star, interacts with the belt through gravitational force. Various orbital configurations are assumed for the system. Direct N-body simulations are performed to investigate the dynamical evolution of the asteroids' belt. It is found that a larger orbital eccentricity of the neutron star will destroy the belt more quickly, with a large number of asteroids being scattered out of the system. A low inclination not only suppresses the collisions but also inhibits the ejection rate at early stages. However, highly inclined systems may undergo strong oscillations, resulting in the Kozai–Lidov instabilities. Among the various configurations, a clear periodicity is observed in the collision events for the case with an orbital eccentricity of 0.7 and mutual inclination of 0◦. It is found that such a periodicity can be sustained for at least eight neutron star orbital periods, supporting this mechanism as a possible explanation for periodically repeating FRBs. Our studies also suggest that the active stage of these kinds of FRB sources should be limited, since the asteroid belt would finally be destroyed by the neutron star after multiple passages.
Fast Downflows Observed during a Polar Crown Filament Eruption
Authors: Sun Zheng , Tian Hui , Li Ting , Liu Rui , Duan Yadan
Published: October 2024

Solar filaments can undergo eruptions that result in the formation of coronal mass ejections, which can significantly impact planetary space environments. Observations of eruptions involving polar crown filaments, situated in the polar regions of the Sun, are limited. In this study, we report a polar crown filament eruption (SOL2023-06-12), characterized by fast downflows below the filament. The downflows appear instantly after the onset of the filament eruption and persist for approximately 2 hr, exhibiting plane-of-sky velocities ranging between 92 and 144 km s−1. They originate from the leading edge of the filament, and no clear acceleration is observed. Intriguingly, these downflows appear at two distinct sites, symmetrically positioned at the opposite ends of the conjugate flare ribbons. Based on the observations, we propose that the filament might be supported by a magnetic flux rope (MFR), and these downflows possibly occur along the legs of the MFR. The downflows likely result from continuous reconnections between the MFR and the overlying magnetic field structures and could either be reconnection outflows or redirected filament materials. We also observed horizontal drifting of the locations of downflows, which might correspond to the MFR’s footpoint drifting. This type of downflow can potentially be utilized to track the footpoints of MFRs during eruptions.
Probing Coronal Mass Ejection Inclination Effects with EUHFORIA
Authors: Martinić Karmen , Asvestari Eleanna , Dumbović Mateja , Rindlisbacher Tobias , Temmer Manuela , Vršnak Bojan
Published: October 2024

Coronal mass ejections (CMEs) are complex magnetized plasma structures in which the magnetic field spirals around a central axis, forming what is known as a flux rope (FR). The central FR axis can be oriented at any angle with respect to the ecliptic. Throughout its journey, a CME will encounter interplanetary magnetic fields and solar winds that are neither homogeneous nor isotropic. Consequently, CMEs with different orientations will encounter different ambient medium conditions and, thus, the interaction of a CME with its surrounding environment will vary depending on the orientation of its FR axis, among other factors. This study aims to understand the effect of inclination on CME propagation. We performed simulations with the EUHFORIA 3D magnetohydrodynamic model. This study focuses on two CMEs modeled as spheromaks with nearly identical properties, differing only by their inclination. We show the effects of CME orientation on sheath evolution, MHD drag, and nonradial flows by analyzing the model data from a swarm of 81 virtual spacecraft scattered across the inner heliospheric. We have found that the sheath duration increases with radial distance from the Sun and that the rate of increase is greater on the flanks of the CME. Nonradial flows within the studied sheath region appear larger outside the ecliptic plane, indicating a “sliding” of the interplanetary magnetic field in the out-of-ecliptic plane. We found that the calculated drag parameter does not remain constant with radial distance and that the inclination dependence of the drag parameter cannot be resolved with our numerical setup.
Oxygen Isotope Exchange between Dust Aggregates and Ambient Nebular Gas
Authors: Arakawa Sota , Yamamoto Daiki , Ishizaki Lily , Okamoto Tamami , Kawasaki Noriyuki
Published: October 2024

Meteorites and their components exhibit a diverse range of oxygen isotope compositions, and the isotopic exchange timescale between dust grains and ambient gas is a key parameter for understanding the spatiotemporal evolution of the solar nebula. As dust grains existed as macroscopic aggregates in the solar nebula, it is necessary to consider the isotopic exchange timescales for these aggregates. Here, we theoretically estimate the isotope exchange timescales between dust aggregates and ambient vapor. The isotope exchange process between aggregates and ambient vapor is divided into four processes: (i) supply of gas molecules to the aggregate surface, (ii) diffusion of molecules within the aggregate, (iii) isotope exchange on the surface of constituent particles, and (iv) isotope diffusion within the particles. We evaluate these timescales and assess which one becomes the rate-determining step. We reveal that the isotope exchange timescale is approximately the same as that of the constituent particles when the aggregate radius is smaller than the critical value, which is a few centimeters when considering the exchange reaction between amorphous forsterite aggregates and water vapor.
Mixed Source Region Signatures inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics
Authors: Rivera Yeimy J. , Badman Samuel T. , Stevens Michael L. , Raines Jim M. , Owen Christopher J. , Paulson Kristoff , Niembro Tatiana , Livi Stefano A. , Lepri Susan T. , Landi Enrico , Halekas Jasper S. , Ervin Tamar , Dewey Ryan M. , Coburn Jesse T. , Bale Stuart D. , Alterman B. L.
Published: October 2024

Since Parker Solar Probe’s (Parker’s) first perihelion pass at the Sun, large-amplitude Alfvén waves grouped in patches have been observed near the Sun throughout the mission. Several formation processes for these magnetic switchback patches have been suggested with no definitive consensus. To provide insight into their formation, we examine the heavy ion properties of several adjacent magnetic switchback patches around Parker’s 11th perihelion pass, capitalizing on a spacecraft lineup with Solar Orbiter where each samples the same solar wind streams over a large range of longitudes. Heavy ion properties (Fe/O, C6+/C5+, O7+/O6+) related to the wind’s coronal origin, measured with Solar Orbiter, can be linked to switchback patch structures identified near the Sun with Parker. We find that switchback patches do not contain distinctive ion and elemental compositional signatures different from the surrounding nonswitchback solar wind. Both the patches and ambient wind exhibit a range of fast and slow wind qualities, indicating coronal sources with open and closed field lines in close proximity. These observations and modeling indicate switchback patches form in coronal hole boundary wind and with a range of source region magnetic and thermal properties. Furthermore, the heavy ion signatures suggest interchange reconnection and/or shear-driven processes may play a role in their creation.
Distribution extension of a vent scale worm Branchinotogluma bipapillata (Polychaeta, Polynoidae) in the Indian Ocean
Authors: Lee Won-Kyung , Kim Se-Joo
Published: October 2024

Branchinotogluma Pettibone, 1985 is the most species-rich genus within the subfamily Lepidonotopodinae Pettibone, 1983, comprising 18 valid species from chemosynthesis-based ecosystems in the Pacific and Indian Oceans. Here, we report a new distributional record of Branchinotogluma bipapillata Zhou, Wang, Zhang & Wang, 2018, at the hydrothermal vent sites on the northern Central Indian Ridge (nCIR). This record represents the northernmost occurrence of B. bipapillata in the Indian Ocean. We conducted a comparative study of the nCIR population and other documented populations using distributional information, morphological traits, and genetic markers (two mitochondrial [COI, 16S rRNA] and one nuclear [18S rRNA] genes). While most morphological characters of B. bipapillata were consistent with those found in the Southwest Indian Ridge (SWIR), variations were noted in the segment with the last branchiae. Molecular data revealed that all populations of B. bipapillata form a single clade, indicating a wide distribution from the SWIR to nCIR, covering ~4,000 km across various ridges in the Indian Ocean. This study presents extensive distribution of a vent species with well-connected populations throughout the Indian Ocean, distinguishing it from many other vent species affected by the dispersal barrier in the Indian Ocean.
Critique et affinité. Le voyage à Leipzig de Marcel Raymond
Authors: Cohn Danièle
Published: October 2024

Autour et avec le cas exemplaire qu’est Marcel Raymond, l’article présente ce qu’il en est du voyage d’un sujet, de sa reprise dans un récit et de l’établissement qui en résulte d’une critique affinitaire. La part du sujet, celle d’une existence et de sa formation intellectuelle dans ses années d’apprentissage et la part de l’objet, en l’occurrence des œuvres littéraires, y trouvent un équilibre dialectique entre expérience et connaissance, existence et interprétation, singularité d’un sentiment et intelligibilité.
Les prodiges de l’alliance. Judith Butler et l’exercice performatif de la souveraineté populaire
Authors: Urfalino Philippe
Published: October 2024

La théorie politique des rassemblements proposée par Judith Butler assimile les mouvements protestataires à des alliances déterminées par les affinités entre personnes vulnérables. L’article examine la robustesse de ses principaux ressorts théoriques : le concept d’identité qui ordonne sa conception du corps politique, sa théorie de la souveraineté et la fonction constituante prêtée au performatif. Finalement, il s’interroge sur le statut de l’ensemble de la réflexion, se demandant si elle relève bien d’une pensée politique ou plutôt d’une philosophie morale.
La mesure d’impact : construction d’un objet commun entre capital-risqueur et entrepreneur ?
Authors: Boucaud Lucas , Freiss Daniel
Published: October 2024

L’ Impact Investing (II) vise à produire un impact positif et mesurable sur le plan social et/ou environnemental tout en conservant un retour financier positif. Les organismes de capital-risque à impact (CRI) occupent une place importante en tant qu’intermédiaire entre les investisseurs et les entrepreneurs à impact. La littérature s’est focalisée sur l’étude de l’articulation de ces deux enjeux (financiers et environnementaux/sociaux) difficiles à concilier au prisme des logiques institutionnelles. La construction de l’accord entre CRI et entrepreneur et la façon dont l’impact est intégré dans cette démarche est encore assez méconnue (Agrawal, Hockerts, 2021). S’appuyant sur l’Économie de la Grandeur (Boltanski, Thévenot, 2022), notre étude de plusieurs dyades CRI-entrepreneur a identifié deux enjeux clés : la corrélation positive entre activité et impact (i) et la possibilité de traduire cet impact dans une métrique d’impact générique (ii). Code JEL : G24
Quels modes d’ambidextrie pour la servicisation ? Une étude longitudinale en PME
Authors: Peillon Sophie
Published: October 2024

La question du rôle de l’ambidextrie dans la servicisation des entreprises industrielles est reconnue comme primordiale tout en restant sous-étudiée. Dans cet article, nous visons à combler ce gap en analysant le cas d’une PME industrielle afin d’identifier les modes d’ambidextrie qu’elle a mobilisés au cours du temps pour soutenir le développement de ses activités de service. Nous montrons que l’exploitation et l’exploration dans le domaine des services apparaissent comme combinées et se renforçant mutuellement. Nous montrons également l’existence d’une ambidextrie « hybride » au sein de cette PME, reposant sur une combinaison des différents modes d’ambidextrie structurelle, de réseau, séquentielle, contextuelle et managériale. Cette étude permet ainsi d’enrichir à la fois la littérature sur la servicisation et sur l’ambidextrie en PME.Codes JEL : O31, O32
Mythe et pouvoir politique : la démocratie est-elle possible ?
Authors: Rhéaume Jacques , Guimarães Ludmila V.M.
Published: October 2024

Les auteurs analysent dans ce texte la dimension mythique du pouvoir dans nos sociétés contemporaines à partir de travaux de Freud, de Renato Mezan, de Paul Ricœur, de Cornélius Castoriadis, les reliant à la pensée d’Eugène Enriquez développée dans son livre De la horde à l’État . La trame centrale est sa vision dialectique du pouvoir humain entre psychogénèse et anthropologie. Un accent est mis ensuite sur les diverses formes du pouvoir politique, hier et aujourd’hui, à partir de son ouvrage Clinique du pouvoir . S’il reconnaît l’importance du projet démocratique tributaire d’une capacité individuelle et sociale d’action inscrite dans le développement socio-historique de nos sociétés, il souligne le maintien fragile d’un équilibre d’un tel type de lien social visé et sa destruction toujours possible.
Créer la science politique en milieu hostile
Authors: Alliès Paul
Published: October 2024

Le colloque organisé à l’occasion des 40 ans de la création du CEPEL a été l’occasion de revenir sur les circonstances et le contexte de celle-ci. Il a ainsi conduit à établir un état des séquences qui ont jalonné l’histoire de l’entreprise, à partir d’archives lacunaires et de mémoire vive. Il s’est d’abord agi de chroniquer l’hostilité dominante à la moindre reconnaissance de la science politique par et dans la Faculté de Droit de Montpellier avant comme après 1968. Puis de rendre compte des contextes conflictuels qui ont favorisé l’implantation de la discipline dans la structuration des représentations et enseignements du droit, souvent en rapport avec un passé problématique. Par ailleurs, la dialectique entre formations universitaires académiques locales et installation spécifique d’une communauté politiste nationalement autonome, a secrété un champ expansif de la recherche. Son ancrage dans une « aire » légitimée par le CNRS (« l’Europe du Sud ») et la valorisation de thèmes et réseaux afférents, a permis l’implantation d’un foyer proactif et comparatiste. Son attractivité a participé de l’expansion de la science politique dans les Facultés de droit en France dans cette période de la fin des années 1990. Sa visibilité a été augmentée par le lancement de la revue Pôle Sud. Tout ceci a suscité une dynamique permettant la conquête d’institutions universitaires traditionnelles, jusqu’à un projet de création d’un Institut d’Études Politiques reconnu par et dans l’Université de Montpellier. L’échec de celui-ci, dû essentiellement à des facteurs et conflits politiques externes, s’est finalement soldé par l’assimilation complète à la Faculté traditionnelle devenant « de droit et de science politique ». Les éléments réunis dans cet article concernent donc tout autant un cas d’espèce singulier et la synergie entre un faisceau de facteurs politiques, académiques, institutionnels. C’est ainsi une contribution à l’histoire des pratiques liées à une expérimentation de parcours et interactions généralement oubliées dans les processus de transformation des structures universitaires.
La parenthèse enchantée. L’Europe du Sud comme aire de spécialisation du CEPEL à Montpellier
Authors: Roux Christophe
Published: October 2024

Cet article vise à rendre compte de la façon dont l’Europe du Sud a été érigée en aire de spécialisation du Centre d’Études Politiques de l’Europe Latine (CEPEL) au sein de la Faculté de droit et de science politique de l’Université de Montpellier. Il confronte les logiques d’émergence de l’Europe méridionale comme aire d’étude au niveau international à celles localement observées à Montpellier. Il illustre les façons variables dont elle a été travaillée à la fois par des travaux resitués dans leur contexte intellectuel et par la construction d’une dynamique institutionnelle spécifique avant qu’un terme y soit porté.
Comparing exceptionalisms: France, the United States, and the programmatic approach
Authors: Smyrl Marc
Published: October 2024

Deux ouvrages récents sur la réforme des politiques de santé, un premier sur la France par William Genieys et Mohamed-Saïd Darviche, et un second sur les USA par Genieys, marquent la phase culminante d’un programme de recherche dons les diverses étapes se sont déroulées durant trois décennies. En explorant le rôle des élites à l’intérieur de l’État, en particulier les experts et les hauts fonctionnaires, ces études avancent la connaissance scientifique des dynamiques pratiques de la réforme dans les systèmes institutionnels complexes. Dans leur ensemble, les deux études fournissent également une contribution à l’étude comparée des politiques publiques. La place centrale qu’elles donnent aux acteurs nous permet de mieux comprendre l‘importance des structures d’opportunités institutionnelles nationales, tout en apportant une critique constructive de l’approche « institutionaliste ».
Les politiques culturelles au Sud : Modèles, valeurs, singularités
Authors: Djakouane Aurélien , Audemard Julien
Published: October 2024

Cet article retrace les échanges consacrés aux politiques culturelles en Europe du Sud et du Sud-Est au cours de l’atelier éponyme organisé lors du colloque des 40 ans du CEPEL. Nous proposons d’engager la réflexion sur les trajectoires des politiques culturelles en Europe du Sud au cours de ces dernières décennies, en particulier sur la spécificité des politiques culturelles au sein de cette aire géographique, leurs singularités et leurs convergences en lien avec l’intégration européenne et, plus largement, avec les processus d’institutionnalisation de l’intervention publique en matière de culture. Nous revenons également sur les mouvements récents de politisation de la culture en évoquant le cas des régimes et des mouvements illibéraux, dont l’Europe du Sud-Est constitue un laboratoire d’analyse pertinent.