bluuebunny/crossref_metadata_2025 huggingface dataset:
Pivoting to Manage the Integration of Two Initially Separate Business Models: The Case of the Digital Transformation of Established Retailers
Authors: Do Vale Guillaume , Collin-Lachaud Isabelle , Lecocq Xavier
Published: September 2024

Due to increasing digitalization, most companies have added online retail as a new business model (BM) separate from their initial physical BM, requiring them to manage a portfolio of BMs. The literature points out that companies choose between a separation or integration strategy to manage their multiple BMs. However, business cases show that companies adopting a separation strategy may then plan for a possible integration strategy. Despite the growing knowledge in the BM portfolio literature, scholars and practitioners still lack a comprehensive understanding of the integration process of two BMs that were initially managed separately. This qualitative research draws on a cumulative multiple case study of five retailers to analyze how incumbent firms with different BMs manage their integration. We show that these firms pivoted the management of their BM portfolio.
The notion of pivoting has been studied from the perspective of a single BM. In this research, we demonstrate that the process of pivoting also applies to the management of several BMs. Our results provide a generic model of the BM integration process that underlines barriers and enabling pivoting factors. Finally, by considering pivoting at this corporate level, our research adds to the ongoing discussion in strategic management regarding the way companies manage the dynamics of their BM portfolio.
Cooperative Learning Through Boundary Spanning: How a Corporate Learning Department Ensures That Trainers and Content Stay Current
Authors: Ofstad Barbara , Bartel-Radic Anne
Published: September 2024

Continuous learning is central to ensuring organizations remain innovative and high-performing. Corporate trainers play a critical role in educating and training employees. However, in an era of digital transformation and, more recently, artificial intelligence, trainers need new skills and methods to stay current and facilitate the transformation of the workforce. The skills gap is best filled through cooperative learning with other trainers. However, cooperative learning is hindered by different spatial, organizational, and cultural boundaries that are difficult to overcome.
This paper attempts to understand how cooperative learning of trainers can be enhanced through boundary spanning. It examines the case of the corporate learning department of a German high-tech multinational through ethnographic action research by the department manager, including 21 semi-directive interviews and direct observation. Using a grounded theory approach, we explore how the concept, causes, context, contingencies, and conditions of boundary spanning enhance cooperative learning among corporate trainers.
The findings show that boundary spanning leads to cooperative learning through pedagogical scaffolding, communities of practice, and a new learning culture. Spontaneous boundary spanning occurs in parallel to guided boundary spanning. Both are made possible by appropriate leadership values and attitudes, trust, flexibility, and dedicated time and capacity.
Our paper provides recommendations on the key issues managers face in facilitating boundary spanning and cooperative learning among their employees. We also show how key barriers and risks can be mitigated to enable employees to learn cooperatively with colleagues from different and distant organizational units.
Significance of Ahiara, the Ahiara Declaration and Its Implications for the Biafra-Nigeria Civil War, 1967-1970
Authors: Okoko Charles Okeke , Odinaka Onozie Cosmas , Eke Justine Chibueze
Published: September 2024

Ecology always played important roles in historical determinism; and basically, also as landscapes for defense, assaults and as (motivational) totems. Since the 1970s, certain questions have engaged Igbo historians, anthropologists/ethnographers and commentators in recent histories of Igboland nexus the factors that accounted for the significance of Ahiara in Mbaise, for it to have been chosen as historically (ethnically) strategic for the Ahiara Declaration by Lieutenant Colonel Chukwuemeka Odumegwu Ojukwu in 1969. The paper undertook to discern the geographical importance of Ahiara vis-à-vis other similarly regarded territorial patches, such as the choice of Perestroika and Glasnot by Mikhail Gorbachev and why the Kenyans have always dominated the Marathon races in Olympiads; and in pronouncements made in ecological environments, such as Ahiara, Arusha in Tanzania, Kenya and Russia. Subsidiary questions raised were: Did Ahiara command a centrality in location in Igboland that it was chosen? Were the Ahiara a martial people that their territory was preferred to those of the Abam, Ngwa and Ohafia, who had evolved celebrated military ethos? Perhaps, the findings were convincing to have compelled Ojukwu to choose Ahiara for his “win-the-war’ manifesto. The paper concluded that the choice of Ahiara was, comparatively, apt; and portrayed an essential historicality. But the Ahiara Declaration was made at the twilight of the Republic of Biafra and could not have been, unarguably, useful for the war effort. Oral interviews were conducted while primary sources predominated in writing this paper.
Hábitos Alimentarios de los Adultos Jóvenes que a la Fundación Ecuatoriana de Desarrollo Integral Rosa de los Vientos
Authors: Oñate López Gabriela Paulina , Real Becerra Tarcisio Sebastián , Sulbarán Brito Migdalia Janeth
Published: September 2024

Todas las personas deberían disfrutar plenamente de los derechos fundamentales y ser asistidos en lo que requieran, para garantizarles calidad de vida. Sin embargo, se conoce que aquellas con discapacidad enfrentan barreras en la atención médica y prevención, lo que impacta negativamente su salud y bienestar. Es crucial mejorar la accesibilidad y adoptar políticas inclusivas para asegurar una atención equitativa. De manera que, ante necesidad de conocer el estado nutricional de las personas con discapacidad en Ecuador, particularmente en la provincia de Chimborazo, se propone este estudio que tiene como fin determinar los hábitos alimentarios de los adultos jóvenes que a la fundación ecuatoriana de desarrollo integral rosa de los vientos a través de un registro de control de medidas antropométricas. Estudio ejecutado desde el enfoque cuantitativo. El tipo de investigación seleccionado fue descriptivo y el nivel de campo. Los participantes fueron 13 personas de la institución antes mencionada. Las técnicas empleadas fueron la observación y la encuesta. Para analizar los datos se empleó el programa Statistical Package for the Social Sciences (SPSS). Los resultados mostraron que la fiabilidad interna del Alfa de Cronbach estaba en un rango de 0,96. También se pudo determinar que el estado nutricional de los adultos jóvenes de la Fundación Ecuatoriana de Desarrollo Integral Rosa de los Vientos (FERVI) es mayormente saludable, con la mayoría manteniendo un peso normal y buenos hábitos alimentarios. Sin embargo, una proporción significativa enfrenta desafíos como bajo peso, sobrepeso y dependencia de comida chatarra, exacerbados por la falta de supervisión profesional, tiempo y recursos económicos.
Kontribusi Komunitas Serikat Pekerja Rumah Tangga (SPRT) dalam Pendampingan Pekerja Rumah Tangga di Tangerang Selatan
Authors: Annisa Rizny , Hikmawan M. Dian
Published: September 2024

AbstrakSerikat Pekerja Rumah Tangga (SPRT) merupakan komunitas kelompok para pekerja rumah tangga yang kehadirannya difaktori oleh banyaknya permasalahan yang dihadapi oleh para PRT, khususnya dikecualikannya PRT dari payung hukum ketenagakerjaan. Pekerja rumah tangga rentan mengalami kekerasan dalam bekerja dikarenakan tidak adanya batasan hukum yang jelas antar PRT dan majikan. Dengan banyaknya permasalahan yang terjadi, maka PRT membentuk kelompok komunitas non-pemerintahan yakni Serikat Pekerja Rumah Tangga (SPRT). Penelitian ini bertujuan untuk menjelaskan mengenai pendampingan yang diberikan oleh SPRT Tangsel kepada para Pekerja Rumah Tangga. Penelitian ini menggunakan metode kualitatif dengan pendekatan fenomenologi. Teknik pengambilan data menggunakan observasi, wawancara dan dokumentasi. Penelitian ini menggunakan teori Community Development Jim Ife frank dengan 4 indikator peran. Berdasarkan hasil penelitian, dapat disimpulkan bahwa SPRT Rumpun Tangsel melakukan pendampingan kepada sesama anggotanya melalui 4 peran pendampingan komunitas. Yakni peranan memfasilitasi, peranan edukasi, peranan representasi, dan peranan teknis. SPRT Tangsel menjadi komunitas yang mendampingi para pekerja rumah tangga di Tangerang Selatan dalam memperjuangkan hak mereka sebagai pekerja.Kata Kunci: Pekerja Rumah Tangga, Pendampingan, Komunitas AbstractThe Domestic Workers Union (SPRT) is a community of domestic workers whose presence is motivated by the many problems faced by domestic workers, especially the exclusion of domestic workers from the labor law. Domestic workers are vulnerable to violence at work due to the absence of clear legal boundaries between domestic workers and employers. With the many problems that occur, domestic workers formed a non-governmental community group, the Domestic Workers Union (SPRT). This research aims to explain the assistance provided by SPRT Tangsel to domestic workers. This research uses a qualitative method with a phenomenological approach. Data collection techniques using observation, interviews and documentation. This research uses Jim Ife Frank's Community Development theory with 4 role indicators. Based on the results of the study, it can be concluded that SPRT Rumpun Tangsel provides assistance to its fellow members through 4 community assistance roles. Namely, the facilitating role, the educational role, the representation role, and the technical role. SPRT Tangsel is a community that assists domestic workers in South Tangerang in fighting for their rights as workers.Keywords: Domestic Worker, Mentoring, Community
Kebijakan Pertanian Berkelanjutan Melalui Program Pertanian Lahan Kering 10 Hektar
Authors: Helena Egberta , Himang Willibrordus , Jamal Muh
Published: September 2024

AbstrakSebagai kabupaten termuda di Kalimantan Timur dan kaya akan sumber daya alamnya, kegiatan pembangunan di Mahakam Ulu terus gencar dilakukan guna mengejar ketertinggalan infrastruktur baik itu fisik maupun non fisik, termasuk pada bidang pertanian. Hal ini dipengaruhi letak dan jarak akses yang ada di Kabupaten Mahakam Ulu yang memerlukan adanya kemandirian pangan untuk menekan biaya pemenuhan pangan yang terlalu tinggi. Sebagai langkah untuk menghindari eksplotasi lahan yang berlebihan, dan juga menjaga kualitas sumber daya alam yang ada, sejak tahun 2017 pemerintah mengeluarkan program perlindungan lahan pertanian berkelanjutan, yang pada program ini sendiri dipadu padankan dengan program lahan kering 10 hektar. Penelitian ini sendiri menggunakan pendekatan kualitatif deskriptif untuk memberikan deskripsi dan gambaran hasil temuan dalam penelitian, selain itu metode pengumpulan data dilakukan menggunakan studi kepustakaan. Hasil temuan dalam penelitian ini menunjukkan program lahan kering 10 hektar sudah mengarah pada usaha pertanian yang berkelanjutan. Disamping itu perlu adanya penambahan sumber daya manusia dari sisi tenaga teknis dan penguatan pemahaman masyarakat dari sosialisasi terkait pentingnya menjaga keberlanjutan dalam pertanian.Kata Kunci: Pertanian, Pertanian Berkelanjutan, Lahan Kering AbstractAs the youngest regency in East Kalimantan and rich in natural resources, development activities in Mahakam Ulu are vigorously carried out to catch up with infrastructure, both physical and non-physical, including in the agricultural sector. This is influenced by the location and access distance in Mahakam Ulu Regency, which requires food self-sufficiency to reduce the high cost of food supply. As a measure to avoid excessive land exploitation and to maintain the quality of existing natural resources, the government launched a sustainable agricultural land protection program in 2017, which is integrated with the 10-hectare dry land program. This study uses a descriptive qualitative approach to provide a description and overview of the findings in the research, and data collection is conducted using literature study. The findings in this study indicate that the 10-hectare dry land program has already moved towards sustainable agricultural efforts. In addition, there is a need for additional human resources in terms of technical personnel and strengthening public understanding through socialization regarding the importance of maintaining sustainability in agriculture.Keywords: Agriculture, Sustainable Agriculture, Dryland Agriculture
Reclaiming My Womb
Authors: Washington Victoria
Published: September 2024

In Children of Blood and Bone and The Hunted, Tomi Adeyemi and L.A. Banks reclaim the isolated Black womb and reattach it to the human to which it belongs, thus humanizing Black women. This humanization of Black women combats the dominant narrative that seeks to reduce Black female identities to what their bodies can produce for the Western patriarchy world founded on capitalist exploitation. Their wombs are a counternarrative to the tired trope of the almighty phallus that disfigures phallic power into a deadly weapon, only suitable for destruction. Banks’ and Adeyemi’s placement of symbolic wombs highlights the power of wombs as a space where spirit and body meet to upend oppressive world orders rooted in spiritual darkness. Here, even the phallus achieves greater power. The womb exposes the phallus’s ability to invest life and further incubates that life to create revolution. Together the phallus and womb work to display the necessary fetation of rebellion, resistance, and liberation. Banks and Adeyemi join the scores of Black feminist writers who insist on the unity of Black masculinities and Black feminism to ensure the futurity of Black liberation.
No Time for Justice? Obstetric Violence, Damages Claims and Prescription Periods in South African Law
Authors: Swemmer Sheena
Published: September 2024

Obstetric violence is currently not acknowledged as a form of gender-based violence in South African law. In this article I deal with the various issues associated with this failure to correctly categorise obstetric violence. One of the issues relates to access to legal recourse for survivors through delictual claims (torts). Delictual claims are wrongful acts or limitations of rights that can lead to legal liability in the form of monetary compensation. The current framing of obstetric violence as medical malpractice limits women's time to launch a case to only three years after the violation. To show how this issue of prescription (a legal principle where an outstanding debt can be extinguished after a prescribed time period) plays out, I focus on the 2020 report by the South African Commission for Gender Equality (CGE) on the forced or coerced sterilisation of women living with HIV at state healthcare facilities. I also examine the current case of the Centre for Applied Legal Studies (CALS), a university-based human rights law clinic, which represents over 40 women who have experienced different forms of obstetric violence at state-run facilities. In both of these examples, I explain how justice through legal recourse is denied to these victims or survivors through the mischaracterisation of obstetric violence as medical malpractice in current South African law. To show that the three-year ‘limit’ or prescription period to institute a legal claim is unjustifiable, I explore three reasons why women may not choose to or be able to proceed with a legal claim within that time period. The first of these relates to the ‘personal’ barrier women face around acknowledging they have experienced obstetric violence and bringing a claim against the state. The second, the ‘political’ barrier, includes the general and prevalent systemic gender discrimination experienced by women in South Africa and the specific barriers women face around access to dignified treatment in the country's public healthcare system. Finally, an ‘economic’ barrier is the general inaccessibility of legal representation for economically disadvantaged people in the country.  Proceeding from the above, I then argue that by acknowledging obstetric violence as a form of gender-based violence and aligning it with legislation around prescription periods for other forms of gender-based violence (such as sexual offences), the burdens related to access to justice (at least in delict) can be lightened for survivors.
Eğitim Bilişim Ağındaki (EBA) Ortaokul Fen Bilimleri Ders Videolarının İncelenmesi
Authors: Çiftçi Burak , Aydın Abdullah
Published: September 2024

Günümüzde teknoloji, yaşamımızın her köşesine nüfuz ettiği gibi eğitim alanını da önemli derecede etkilemiştir. Ülkemizde, Milli Eğitim Bakanlığı (MEB) tarafından hayata geçirilen Fırsatları Artırma ve Teknolojiyi İyileştirme Hareketi (FATİH) projesi, teknolojinin eğitimdeki yerini ifade eden oldukça önemli girişimlerden biridir. FATİH projesiyle sınıflar akıllı tahtalarla zenginleştirilerek daha etkileşimli bir öğrenme ortamı yaratılmıştır. Ayrıca, eğitimciler ve öğrenciler için kapsamlı bir dijital kaynak koleksiyonu sağlamak amacıyla Eğitim Bilgi Ağı (EBA) oluşturulmuştur. EBA, öğretmenlerin derslerini geliştirmelerine ve öğrencilerle daha iyi etkileşim kurmalarına olanak tanıyan çok sayıda öğretici video ve etkileşimli materyal sunmaktadır. Bu çalışma, Milli Eğitim Bakanlığı tarafından oluşturulan EBA tarafından sağlanan ortaokul fen bilimleri ders videoları ve etkileşimli içeriklerin değerlendirilmesine odaklanmaktadır. Bu noktada, süre, görüntülenme sayısı, videoların sınıf dağılımı ve eğitim hedefleriyle uyumu gibi temel değişkenler analiz edilmiştir. Çalışmada uzman fen bilimleri eğitimcisi tarafından beşinci sınıftan sekizinci sınıfa kadar toplam 924 ders videosu ve 282 etkileşimli materyal dikkatlice ve her parça iki kez izlenerek inceleme yapılmıştır. Elde edilen veriler döküman analiz tekniği kullanılarak analiz edilmiştir.
Decision Support System Model for College Kartu Indonesia Pintar (KIP) Scholarship Recipients Using the C4.5 Decision Tree Method and Simple Additive Weighting (SAW)
Authors: Hadi Nofiar , Rizkiawan M. Asep , Moedjiono Moedjiono , Nuroji Nuroji
Published: September 2024

The KIP-Kuliah Scholarship is an Indonesian government program that is used to help high school students (SMA) or equivalent who are less capable but have academic potential in financing education in college. In this study, the problem limitation or scope of research is at Prof. DR. HAMKA Muhammadiyah University College in the Management Study Program. In each year the selection of scholarship acceptance often changes criteria, because of the frequent changes in scholarship criteria each year users often experience problems in selecting KIP-Kuliah scholarship recipients. Decision Support System (SPK) is a solution to assist in decision making. The purpose of this research is to assist in decision making in determining scholarship recipients in accordance with existing criteria. The method used in this research is using Decision Tree C4.5 to determine the weight of the KIP-Kuliah scholarship criteria and the Simple Additive Weighting (SAW) method is used to determine the ranking of scholarship recipients. In this study, researchers used 3 criteria, namely the amount of parents' income, the number of dependents, and the interview test scores. The results of the analysis of the calculations using the Decision Tree C4.5 and Simple Additive Weighting (SAW) methods and the results of the selection of college KIP scholarships consisting of the criteria for the amount of parents' income, the number of dependents and the interview test, the 12 students who deserve college KIP scholarships are students who get the highest preference scores, namely M11, M3, M6, M4, M14, M1, M5, M12, M10, M2, M7, and M9. In conclusion, the use of a Decision Support System with the Decision Tree C4.5 and Simple Additive Weighting (SAW) methods is effective in helping determine the recipients of the KIP-Kuliah scholarship in accordance with predetermined criteria.
The Time for development financing : One Pager IPCid 001
Authors: Oliveira Ivan , Barros Pedro Silva
Published: September 2024

O financiamento para o desenvolvimento tornou-se crucial diante das transformações globais aceleradas pela pandemia de COVID-19, especialmente afetando países pobres e em desenvolvimento. Mobilizar recursos eficientes, tanto domésticos quanto internacionais, é essencial para promover transformações produtivas e enfrentar desafios sociais e ambientais alinhados aos Objetivos de Desenvolvimento Sustentável e ao combate às mudanças climáticas. O Brasil busca reposicionar-se globalmente, reduzindo desigualdades e promovendo uma economia integrada, com uma nova agenda fiscal e uma política externa ativa. Sua liderança no G20 e no BRICS oferece oportunidades para cooperação internacional e revisão da governança financeira global, enquanto a integração regional na América do Sul é prioritária para fortalecer o comércio e abordar o desenvolvimento sustentável da Amazônia. A Revista Tempo do Mundo destaca essas questões e propõe estratégias para o envolvimento do Brasil em instituições multilaterais alinhadas com a Agenda 2030.
The Key roles of development banks : One Pager IPCid 002
Authors: Griffith-Jones Stephany
Published: September 2024

Após a crise financeira global e a pandemia de COVID-19, houve um ressurgimento dos bancos públicos e de desenvolvimento, desempenhando um papel crucial como medidas contracíclicas e fornecedores de capital de longo prazo. Esses bancos financiam 10% dos investimentos globais, mas muitas vezes enfrentam limitações de capital. Eles desempenham um papel vital na concessão de empréstimos de longo prazo para transformação estrutural, inovação e transição para uma economia mais verde e inclusiva. No entanto, para serem mais eficazes, é necessário que tenham um capital adequado e se concentrem na transição para economias de baixo carbono. Além disso, sua experiência acumulada pode ajudar os governos na formulação de políticas públicas para a transformação verde. É essencial que esses bancos maximizem seu impacto no desenvolvimento, focando na inovação e na transformação estrutural em direção a uma economia mais dinâmica, inclusiva e verde.
Silent Storm: The Unfolding of Lupus Nephritis in a Young Female Patient
Authors: Gaur Ishana
Published: September 2024

Background Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disorder with multi-organ involvement, particularly affecting the kidneys in the form of lupus nephritis. Lupus nephritis is a severe complication of SLE and is a leading cause of morbidity and mortality in these patients. The disease primarily affects young adults and is characterized by proteinuria, hematuria, and kidney dysfunction. Early diagnosis and timely treatment are crucial in preventing progression to end-stage renal disease.  Case Report A 32-year-old female presented with a three-month history of skin rashes, hair loss, oral ulcers, and joint pain, followed by the development of edema, generalized weakness, and frothy urine. Physical examination revealed significant pitting edema, ascites, and pleural effusion. Laboratory investigations showed anemia, hypoalbuminemia, hypercholesterolemia, elevated inflammatory markers, and proteinuria in the nephrotic range. Autoimmune markers were positive for ANA, dsDNA, and other lupus-associated antibodies. Renal ultrasound revealed increased cortical echogenicity, and a kidney biopsy confirmed membranous lupus nephritis (ISN/RPS Class V). The patient was started on high-dose corticosteroids and cyclophosphamide for induction therapy, followed by a maintenance regimen. Her condition improved significantly, with proteinuria reduced to less than 0.5 grams/24 hours, and her edema resolved.  Conclusion This case emphasizes the importance of early recognition and treatment of lupus nephritis in patients with SLE to prevent irreversible kidney damage. The patient's favorable response to timely immunosuppressive therapy highlights the critical role of aggressive treatment in controlling disease activity and improving outcomes. Regular follow-up and monitoring are essential to ensure long-term disease control and prevent relapses.
Joint Deconvolution of Astronomical Images in the Presence of Poisson Noise
Authors: Donath Axel , Siemiginowska Aneta , Kashyap Vinay L. , van Dyk David A. , Burke Douglas
Published: September 2024

We present a new framework for joint likelihood deconvolution (Jolideco) of a set of astronomical observations of the same sky region in the presence of Poisson noise. The observations may be obtained from different instruments with different resolution, and different point-spread functions (PSFs). Jolideco reconstructs a single flux image by optimizing the posterior distribution based on the joint Poisson likelihood of all observations under one of several prior distributions. Most notably, we employ a patch-based image prior that is parameterized via a Gaussian mixture model, which we train on high-signal-to-noise astronomical images, including data from the JWST and the GLEAM radio survey. This prior favors correlation structures among the reconstructed pixel intensities that are characteristic of those observed in the training images. It is, however, not informative for the mean or scale of the reconstruction. By applying the method to simulated data, we show that the combination of multiple observations and the patch-based prior leads to much improved reconstruction quality in many different source scenarios and signal-to-noise regimes. We demonstrate that with the patch prior Jolideco yields superior reconstruction quality relative to alternative standard methods such as the Richardson–Lucy method. We illustrate the results of Jolideco applied to example data from the Chandra X-ray Observatory and the Fermi Gamma-ray Space Telescope. By comparing the measured width of a counts-based and the corresponding Jolideco flux profile of an X-ray filament in SNR 1E 0102.2–7219, we find the deconvolved width of 0.″58 ± 0.″02 to be consistent with the theoretical expectation derived from the known width of the PSF.
Mapping Multiphase Metals in Star-forming Galaxies: A Spatially Resolved UV+Optical Study of NGC 5253
Authors: Abril-Melgarejo Valentina , James Bethan L. , Aloisi Alessandra , Mingozzi Matilde , Lebouteiller Vianney , Hernandez Svea , Kumari Nimisha ,   AAS Journals Data Editors
Published: September 2024

We present a pioneering, spatially resolved, multiphase gas abundance study on the blue compact dwarf galaxy NGC 5253, targeting 10 star-forming (SF) clusters inside six far-UV (FUV) Hubble Space Telescope/Cosmic Origins Spectrograph (COS) pointings with cospatial optical Very Large Telescope/MUSE observations throughout the galaxy. The SF regions span a wide range of ages (1–15 Myr) and are distributed at different radii (50–230 pc). We performed a robust absorption-line profile fitting on the COS spectra, covering 1065–1430 Å in the FUV, allowing an accurate computation of neutral-gas abundances for 13 different ions sampling eight elements. These values were then compared with the ionized-gas abundances, measured using the direct method on MUSE integrated spectra inside analog COS apertures. Our multiphase, spatially resolved comparisons find abundances, which are lower in the neutral gas than the ionized gas by 0.22, 0.80, and 0.58 dex for log(O/H), log(N/H), and log(N/O), respectively. We modeled the chemical abundance distributions and evaluated correlations as a function of the radius and age. It was found that, while N, O, and N/O abundances decrease as a function of age in the ionized gas, they increase with age in the neutral gas. No strong correlations for N, O, or N/O were observed as a function of the radius. The N/O and N/H offsets between the phases were found to decrease with age, providing evidence that chemical enrichment happens differentially, first in the ionized-gas phase around 2–5 Myrs (due to N-rich Wolf–Rayet stars) and then mixing out into the cold neutral gas on longer timescales of 10–15 Myr.
Solar Orbiter Observations of Proton and Alpha Particle Kinetic Signatures Related to the Presence of Switchbacks in the Inner Heliosphere: A Case Study
Authors: Perrone Denise , Settino Adriana , Perri Silvia , D’Amicis Raffaella , De Marco Rossana , Nicolaou Georgios , Telloni Daniele , Bruno Roberto , Owen Christopher J.
Published: September 2024

We investigate how ions, namely protons and alpha particles, kinetically react to the presence of strong deflections in the magnetic field, the so-called switchbacks, in the first stream of slow Alfvénic wind observed by Solar Orbiter at the heliocentric distance of 0.64 au. We focus on an isolated, large-scale switchback, and we study in detail ion kinetic properties. Beyond the expected correlation between the magnetic deflection and ion velocity related to the Alfvénic nature of the switchbacks, we find that, within the switchback, proton and alpha particle densities increase, suggesting ongoing wave activity. Very interestingly, we observe a clear correlation between the magnetic deflection and alpha particle temperature, while no correlation has been found with proton temperature. This is an indication of a possible role played by switchbacks in preferentially heating heavy ions. Our results suggest that the presence of switchbacks can induce a deformation of the proton velocity distribution function, while the preferential heating of alpha particles could be due to a denser secondary beam and a smaller relative drift speed between the beam and core.
A Closer Look at the Extended Edge-on Low-surface Brightness Galaxies
Authors: Saburova Anna S. , Gasymov Damir , Rubtsov Evgenii V. , Chilingarian Igor V. , Borisov Sviatoslav , Gerasimov Ivan , Kolganov Fedor , Kasparova Anastasia V. , Uklein Roman I. , Bílek Michal , Grishin Kirill A. , Zasov Anatoly , Demianenko Mariia , Katkov Ivan Yu. , Lalović Ana , Samurović Srdjan
Published: September 2024

To understand the origin of extended disks of low-surface brightness (LSB) galaxies, we studied in detail four such systems with large disks seen edge on. Two of them are edge-on giant LSB galaxies (gLSBGs) recently identified by our team. The edge-on orientation of these systems boosts their surface brightnesses that provided an opportunity to characterize stellar populations spectroscopically and yielded the first such measurements for edge-on gLSBGs. We collected deep images of one galaxy using the 1.4 m Milanković Telescope, which we combined with the archival Subaru Hyper Suprime-Cam and DESI Legacy Surveys data available for the three other systems, and measured the structural parameters of the disks. We acquired deep long-slit spectra with the Russian 6 m telescope and the 10 m Keck II telescope and estimated stellar population properties in the high-surface brightness and LSB regions as well as the gas-phase metallicity distribution. The gas metallicity gradients are shallow to flat in the range between 0 and −0.03 dex per exponential disk scale length, which is consistent with the extrapolation of the gradient–scale length relation for smaller disk galaxies. Our estimates of stellar velocity dispersion in the LSB disks as well as the relative thickness of the disks indicate the dynamical overheating. Our observations favor mergers as the essential stage in the formation scenario for massive LSB galaxies.
Neutrino Oscillation Effects on the Luminosity of Neutrino-dominated Accretion Flows around Black Holes
Authors: Deesamer Chitipat , Chainakun Poemwai , Sreethawong Warintorn
Published: September 2024

A stellar-mass black hole surrounded by the neutrino-dominated accretion flow (NDAF) has been proposed as the central engine of gamma-ray bursts. In this work, we investigate the neutrino/antineutrino luminosity and annihilation luminosity from the NDAF and pair annihilation model, taking into account the neutrino oscillation above the accretion disk. The disk's hydrodynamical properties are modeled using an empirical solution previously derived with boundary conditions, including the effect of electron degeneracy and neutrino trapping. Our key parameters are the mass accretion rate and the black hole spin given in the ranges of

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0.1

–10 M
⊙ s−1 and 0 ≤ a < 1, respectively. Without neutrino oscillation, the obtained neutrino/antineutrino luminosity is ∼1051–1053 erg s−1, while the neutrino annihilation luminosity is found to be ∼1046–1051 erg s−1. In the presence of neutrino oscillation in the vacuum limit, the electron neutrino annihilation luminosity decreases by ≲22% through the flavor transformation, while the muon and tau neutrino luminosity can increase by up to ∼45% and 60%, respectively. As a result, the total annihilation luminosity can be reduced by up to ∼19% due to the oscillation process above the disk. Finally, we also investigate the case whereby the charge-conjugation-parity-symmetry-violating (CP-violating) phase is changed from δCP = 0° to 245°. However, our results reveal that the CP-violating phase has minimal impact on the neutrino annihilation luminosity.
X-Ray Flashes on Helium Novae
Authors: Kato Mariko , Hachisu Izumi
Published: September 2024

A helium nova occurs on a white dwarf (WD) accreting hydrogen-deficient matter from a helium star companion. When the mass of a helium envelope on the WD reaches a critical value, unstable helium burning ignites to trigger a nova outburst. A bright soft X-ray phase appears in an early outbursting phase of a helium nova before it optically rises toward maximum. Such an X-ray bright phase is called the X-ray flash. We present theoretical light curves of X-ray flashes for 1.0, 1.2, and 1.35 M
☉ helium novae with mass accretion rates of (1.6–7.5) × 10−7
M
☉ yr−1. Long durations of the X-ray flashes (100 days–10 yr) and high X-ray luminosities (∼1038 erg s−1) indicate that X-ray flashes are detectable as a new type of X-ray transient or persistent X-ray sources. An X-ray flash is a precursor of optical brightening, so that the detection of X-ray flashes on helium novae enables us to plan arranged observation for optical premaximum phases that have been one of the frontiers of the study of novae. We found a candidate object of helium-burning X-ray flash from the literature on extragalactic X-ray surveys. This X-ray transient source is consistent with our X-ray flash model of a 1.35 M
⊙ WD.
SOHO SWAN Lyα Models Supporting LRO LAMP: 2008–2023
Authors: Pryor Wayne R. , Tobiska W. Kent , Retherford Kurt D. , Grava Cesare , Egan Anthony , Greathouse Thomas K. , Gladstone G. Randall , Quémerais Eric
Published: September 2024

The Lunar Reconnaissance Orbiter Lyman-Alpha Mapping Project (LAMP) has been mapping the Moon since its launch in 2009. Faint ultraviolet illumination of the lunar dark side includes light from stars and from hydrogen Lyα emissions, mostly attributed to sunlight scattered by hydrogen atoms near the Sun with a smaller contribution from the whole Galaxy. Models of the lunar illumination by time-dependent Lyα photons have allowed the LAMP team to map polar shadowed craters suspected of harboring water ice and other volatiles. This paper describes the model that provides daily all-sky Lyα maps tuned by comparisons with all-sky Lyα maps from the SOlar and Heliospheric Observatory Solar Wind ANisotropy Experiment stationed at the Sun–Earth L1 point.
Dynamic analysis and optimal control of co-infection system under different outbreak times of mutant strains
Authors: Zhu Bolin , Qiu Dong
Published: September 2024

In epidemic prevention efforts, the emergence of new virus strains due to mutations greatly complicates the prediction and management of epidemics. Most of the current mathematical models of infectious diseases assume that the mutant strain and the original strain have the same outbreak time, which is obviously an ideal situation. In order to make the study more practical, we consider the general situation of outbreaks of mutated strains. At the same time, the optimal control strategy under different emergence time of mutant strains was proposed by using the optimal control theory and numerical simulation. This study provides a new theoretical framework for the dual strain competition model with different outbreak times. The final theoretical results and numerical simulation showed that although the emergence time of the mutant did not affect the final trend of the epidemic, it would affect the cost of prevention and control during the control period.
Global asymptotic stability and trajectory structure rules of high-order nonlinear difference equation
Authors: Zhang Qianhong , Shen Liqin
Published: September 2024

In this article, global asymptotic stability and trajectory structure of the following high-order nonlinear difference equation

   \begin{document}$ z_{n+1} = \frac{z_{n-1}z_{n-2}z_{n-4}+z_{n-1}+z_{n-2}+z_{n-4}+b}{z_{n-1}z_{n-2}+z_{n-1}z_{n-4}+z_{n-2}z_{n-4}+1+b}, \quad n\in N, $\end{document}

are studied, where $ b\in[0, \infty) $ and the initial conditions $ z_{i}\in(0, \infty), i = 0, -1, -2, -3, -4. $ Using the semi-cycle analysis method, in a prime period, a continuous length of positive and negative semi-cycles of any nontrivial solution appears periodically: 2, 3, 4, 6, 12. Moreover, two examples are given to illustrate the effectiveness of theoretic analysis.
Locally quasihyperbolic mappings in real Banach spaces
Authors: Hu Caicai
Published: September 2024

In this paper, we use locally quasihyperbolic mappings to establish a characterization for quasihyperbolic mappings in Banach spaces. More generally, we prove that locally coarsely quasihyperbolic mappings are coarsely quasihyperbolic mappings, while the converse is invalid.
Euclidean hypersurfaces isometric to spheres
Authors: Li Yanlin , Turki Nasser Bin , Deshmukh Sharief , Belova Olga
Published: September 2024

Given an immersed hypersurface $ M^{n} $ in the Euclidean space $ E^{n+1} $, the tangential component $\boldsymbol{\omega }$ of the position vector field of the hypersurface is called the basic vector field, and the smooth function of the normal component of the position vector field gives a function $ \sigma $ on the hypersurface called the support function of the hypersurface. In the first result, we show that on a complete and simply connected hypersurface $ M^{n} $ in $ E^{n+1} $ of positive Ricci curvature with shape operator $ T $ invariant under $\boldsymbol{\omega }$ and the support function $ \sigma $ satisfies the static perfect fluid equation if and only if the hypersurface is isometric to a sphere. In the second result, we show that a compact hypersurface $ M^{n} $ in $ E^{n+1} $ with the gradient of support function $ \sigma $, an eigenvector of the shape operator $ T $ with eigenvalue function the mean curvature $ H $, and the integral of the squared length of the gradient $ \nabla \sigma $ has a certain lower bound, giving a characterization of a sphere. In the third result, we show that a compact and simply connected hypersurface $ M^{n} $ of positive Ricci curvature in $ E^{n+1} $ has an incompressible basic vector field $\boldsymbol{\omega }$, if and only if $ M^{n} $ is isometric to a sphere.
Infinitely many solutions for a critical $ p(x) $-Kirchhoff equation with Steklov boundary value
Authors: Kefi Khaled , Ghanmi Abdeljabbar , Sahbani Abdelhakim , Al-Shomrani Mohammed M.
Published: September 2024

In this paper, we aim to tackle the questions of existence and multiplicity of solutions of the $ p(x) $-Kirchhoff problem involving critical exponent and the Steklov boundary value. Further, we research the results from the theory of variable exponent Sobolev spaces, the concentration-compactness principle, and the symmetric mountain pass theorem.
Joint optimization of location and allocation for spare parts depots under ($ r, Q $) inventory policy
Authors: Liu Yaojun , Jia Li , Wang Ping , Song Xiaolin
Published: September 2024

The ability to replace failed spare parts in time directly affects the supportability level of equipment systems. The selection of spare parts' depot locations, inventory mode, and allocation are often separate and independent operations. However, in these situations, the total supply cost is usually relatively high with the consideration of spare parts shortage and maintenance delays. Therefore, this article dealt with a depot location-inventory-allocation problem based on the $ (r, Q) $ inventory method and analyzed a combined network of centralized spare part depot locations, inventory, and allocation. Meanwhile, considering the convenience and speed of spare parts transportation brought about by the improvement of transportation capacity, a network is proposed to adopt a centralized storage and point-to-point allocation strategy for parts replacement, which reduces supportability costs without affecting supply efficiency. An optimization model has been developed that reduces the overall cost of support, including inventory, construction, transportation, and logistics. Three equipment support efficiency metrics were used as constraints in this model to assess the location of open depots: selection availability, fill rate, and predicted downtime. Additionally, due to the knowledge asymmetry, there are some shortage issues which always lead to extra expenditure. The model also introduces uncertain distribution to demand measurement and adopts a genetic algorithm for model solving. Ultimately, a numerical instance was developed so as to verify our results.
La biopolítica como práctica geopolítica en el paradigma securitario: el caso de la pandemia de COVID-19
Authors: Vidal Pérez Esteban
Published: September 2024

Este artículo pretende analizar la relación entre la biopolítica, la teoría de la securitización y la geopolítica en el contexto de la pandemia por COVID-19. Para ello se ha revisado la bibliografía sobre la pandemia en estudios de seguridad, postestructuralistas y geopolíticos, confirmándose una ausencia de investigaciones que consideren conjuntamente estas tres dimensiones de la pandemia. Por este motivo, este artículo propone un enfoque diferente que integra estas tres dimensiones. De este modo, el argumento principal de la investigación engloba las siguientes afirmaciones. En primer lugar, que la securitización de la salud es un tipo específico de biopolítica. En segundo lugar, que la biopolítica es una práctica geopolítica debido a las consecuencias espaciales que genera en la gestión de los procesos biológicos de la sociedad. En tercer lugar, que la securitización del coronavirus conllevó una forma específica de organizar el espacio para maximizar el control de la población por parte de las autoridades. Para comprobar estas hipótesis se han analizado las políticas de salud pública adoptadas por las democracias liberales de América, Europa, Asia y Oceanía, así como sus efectos en la organización del espacio. Los resultados de este estudio muestran que la securitización del COVID-19 creó un espacio biopolítico a nivel local, nacional e internacional que implicó la restricción y suspensión de la libertad de movimiento y del derecho a reunión. Además, el Estado asumió poderes extraordinarios, lo que permitió a las autoridades intervenir en casi todas las esferas de la vida y en todas partes dentro de las fronteras nacionales.
ANÁLISE FUNDAMENTALISTA E A VISÃO KEYNESIANA SOBRE A ESCOLHA DE AÇÕES
Authors: Lima Martins Josilene , Alencar Douglas Alcantara
Published: September 2024

Este trabalho tem como objetivo estudar os principais pontos de estratégia de investimento na Análise Fundamentalista e na visão Keynesiana, buscando responder a seguinte pergunta: há mais semelhanças ou diferenças entre a Análise Fundamentalista e a visão Keynesiana sobre a escolha de ações? Para isso, foi feito um estudo comparativo elencando os principais pontos de ambas as teorias. Sob essa ótica, verificou-se quatro pontos de semelhança, o preço dos ativos, a volatilidade do mercado, as expectativas e a propensão aos investimentos de longo prazo, entretanto, a maneira como cada teoria caracteriza o comportamento dos agentes determina a abordagem de cada uma sobre esses pontos.
A Teoria do Prospecto e os Diferenciais de Comportamento Perante ao Risco em Alunos do Curso de Administração
Authors: NUNES DA SILVA JÚNIOR JOSENALDO , Amarante Patrícia Araújo , Araújo Amarante José Carlos
Published: September 2024

Este artigo averiguou a existência de um processo racional por partes dos discentes do curso de Administração da Universidade Federal da Paraíba – Campus III quando estes investem o seu capital, como também analisou o comportamento dos estudantes segmentados pelo gênero, buscando constatar a influência dessa distinção nos aspectos relacionados às perdas e exposição ao risco. Alicerçado nos princípios teóricos das finanças comportamentais, utilizou-se a Teoria do Prospecto, visando captar os efeitos certeza, reflexo e isolamento para confirmação ou não deste processo. Para tanto, foram aplicados, de maneira remota (online), questionários numa amostra aleatória de 110 discentes, com tratamento de dados por meio de estatística descritiva e de um teste não paramétrico para captar a influência do gênero, o Qui-Quadrado. Os resultados obtidos confirmam empiricamente a existência dos três vieses cognitivos da Teoria do Prospecto na amostra analisada, bem como o fato de que os estudantes tomam as suas decisões de maneira irracional. Além disso, mostrou-se que há uma diferença de comportamento em função do gênero dos agentes, sendo as mulheres mais propensas aos riscos em determinados cenários de ganhos, diferentemente dos homens que foram mais conservadores.
Crescimento econômico brasileiro à luz da teoria pós-keynesiana de distribuição funcional da renda.
Authors: Magalhães Lima Andressa , Alcântara Alencar Douglas
Published: September 2024

Esse trabalho busca analisar o padrão de crescimento da economia brasileira a partir da fundamentação teórica da distribuição funcional da renda pós-Keynesiana. Segundo Bhaduri e Marglin (1990) uma economia vai ser caracterizada como wage-led (quando crescimento for impulsionado pelos salários) ou profit-led (quando crescimento for impulsionado pelos lucros). Para determinar que tipo de crescimento corresponde a economia brasileira entre 2003 e 2015 foi estimada uma equação de investimento. Verificou-se que a economia brasileira nesse período segue o regime profit-led-growth uma vez que aumento dos lucros impacta positivamente o investimento, impulsionando o crescimento.
A dinâmica da política de salário mínimo e suas relações com o desenvolvimento econômico brasileiro no período 1995-2022
Authors: Jorge Arantes Daniel
Published: September 2024

O objetivo deste artigo é a análise da política de salário mínimo nacional sobre o desenvolvimento econômico brasileiro, com ênfase no período entre os anos de 1995 a 2022. A política de salário mínimo retomou seu espaço de importância na tomada de decisão dos governos com a implantação do Plano Real e com a percepção de sua influência na dinâmica econômica, de modo que, por duas décadas, alcançou sucessivos ganhos de poder de compra para uma considerável parcela da população. Por meio da análise dos microdados da PNAD Contínua (IBGE) e de indicadores oriundos da Previdência Social, do DIEESE e do IPEA, pode-se perceber que há a urgência de não se abandonar a política de valorização do salário mínimo, pois esta auxilia na dinâmica da economia nacional, na melhoria da distribuição de renda e, consequentemente, na redução da desigualdade de renda.