bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stripe Error Correction for Landsat-7 Using Deep Learning
Authors: Adıyaman Hilal , Emre Varul Yunus , Bakırman Tolga , Bayram Bülent 
Published: August 2024

Abstract
Long-term time series satellite imagery became highly essential for analyzing earth cycles such as global warming, climate change, and urbanization. Landsat‑7 satellite imagery plays a key role in this domain since it provides open-access data with expansive coverage and consistent temporal resolution for more than two decades. This paper addresses the challenge of stripe errors induced by Scan Line Corrector sensor malfunction in Landsat‑7 ETM+ satellite imagery, resulting in data loss and degradation. To overcome this problem, we propose a Generative Adversarial Networks approach to fill the gaps in the Landsat‑7 ETM+ panchromatic images. First, we introduce the YTU_STRIPE dataset, comprising Landsat‑8 OLI panchromatic images with synthetically induced stripe errors, for model training and testing. Our results indicate sufficient performance of the Pix2Pix GAN for this purpose. We demonstrate the efficiency of our approach through systematic experimentation and evaluation using various accuracy metrics, including Peak Signal-to-Noise Ratio, Structural Similarity Index Measurement, Universal Image Quality Index, Correlation Coefficient, and Root Mean Square Error which were calculated as 38.5570, 0.9206, 0.7670, 0.7753 and 3.8212, respectively. Our findings suggest promising prospects for utilizing synthetic imagery from Landsat‑8 OLI to mitigate stripe errors in Landsat‑7 ETM+ SLC-off imagery, thereby enhancing image reconstruction efforts. The datasets and model weights generated in this study are publicly available for further research and development: https://github.com/ynsemrevrl/eliminating-stripe-errors.
Risk Factors for Suicidal Ideation in Brazilian University Students: A Mixed Methods Study
Authors: Cecchin Hareli Fernanda Garcia , da Costa Hellen Emily Rodrigues , Pacheco Gabriela Ramos , de Valencia Gabriel Barcellos , Murta Sheila Giardini 
Published: August 2024

AbstractDeveloping effective suicide prevention strategies depends on understanding the risk factors of this phenomenon. This study maps the risk factors for suicidal ideation among Brazilian university students using multiple informers: students, health professionals, and course coordinators. The study followed an exploratory, mixed-method study design based on the intervention mapping approach. The first part, qualitative, comprised interviews about suicide risk factors with 20 university students who have had suicidal ideation in the last 12 months. The second part, quantitative, applied a questionnaire on risk factors in university students to 22 health professionals. The third part, qualitative, was an interview about risk factors with 12 undergraduate course coordinators. The qualitative data were analyzed by content analysis, while the quantitative data was analyzed by simple descriptive statistics. The following are the risk factors consistently cited by the three informants: difficulty to carry out young adult developmental tasks, family conflicts, low social support, conflicts in teacher-student relationship, failed institutional support, stress generated by the overload of academic activities, and mental suffering resulting from income inequality. When formulating socio-ecological prevention initiatives focused on students, the university community, the institution, social actors and institutional networks, and public policies, the risk factors must be considered. Hence, investing in decreasing income inequalities policies, professor’s mental health literacy training, institutional welcome policies, peer support through gatekeeper interventions, life skills interventions tailored for emerging adulthood, and mental health promotion in the early stages of life should be the target of efforts.
Occurrence of Patellofemoral Joint Osteoarthritis in Long-Term Postoperative Cases of Open-Wedge High Tibial Osteotomy: Differences in Symptoms Based on Patient-Standing Type Evaluation with and Without Patellofemoral Joint Osteoarthritis
Authors: Gomi Noriyuki , Muramoto Hiroaki , Kataoka Yusuke 
Published: August 2024

Abstract
Purpose
To examine the frequency of patellofemoral joint (PFJ) osteoarthritis (OA) and its symptoms in the long-term course of open-wedge high tibial osteotomy (OWHTO).

Methods
We analyzed 113 joints of 91 patients. OA and osteonecrosis (ON) developed in 91 and 22 joints, after an average postoperative period of 127.5 ± 19.5 months. For X-ray evaluation, the standing femorotibial angle (FTA), % mechanical axis (%MA), Caton–Deschamps index (CDI), patellar tilt angle (TA), lateral patellar shift (LPS), and PFJ space width (medial [MJS] and lateral [LJS]) were analyzed. PFJ-associated symptoms were evaluated using the hospital for special surgery patellar score (HSS-PS) and knee injury and osteoarthritis outcome score patellofemoral subscale (KOOS-PF). Statistical analysis was performed with paired and unpaired t tests, and a risk rate of less than 1% was significantly judged.

Results
Preoperative FTA and CDI decreased from 180.8° to 170.0° and 0.88 to 0.70 at the final follow-up. Preoperative %MA lateralized from 20.8 to 66.0 at the final follow-up. TA and LPS values decreased significantly compared with before surgery until plate removal. The MJS and LJS significantly decreased, and OA with a joint space < 3 mm occurred in 14 cases. However, HSS-PS and KOOS-PF scores were not significantly different between the groups with and without OA.

Conclusion
PFJ OA occurred in 12.4% cases in the long-term postoperative course of OWHTO; however, no symptomatic difference was found in the group with or without OA.
Intra-familial dynamics of knowledge and ignorance experienced by donor-conceived adults in Germany
Authors: Bauer Tobias , Meier-Credner Anne 
Published: August 2024

AbstractThis study explores how donor-conceived adults experience pre- and post-disclosure intra-familial dynamics of knowledge and ignorance in relation to their means of conception. Data were collected through an online survey of 59 individuals aged 21–46 years, who were recruited through the German support and advocacy group Verein Spenderkinder (the Association of Donor-conceived Children). Participants were born into families with heterosexual parents and learned about their conception via anonymous sperm donation between 5 and 46 years of age. Thematic qualitative text analysis revealed four main themes regarding the challenges donor-conceived adults face in reconciling their sense of identity and their relationships within the family: non-absoluteness of pre-disclosure ignorance, new fields of ignorance emerging post-disclosure, ways of dealing with the newly acquired knowledge, and conflicting ownership claims on knowledge and ignorance. These challenges pertain not only to knowledge and ignorance of the participants’ means of conception but also to the way in which (non-)knowing is perceived and managed by family members. Utilizing Peter Wehling’s taxonomy of ignorance as a theoretical framework, the study argues that intra-familial conflicts and challenges experienced by the participants can be attributed to either shifts in or stakeholders’ colliding claims to control the epistemic, social, and temporal dimensions of (non-)knowing in relation to the participants being donor-conceived.
Pupils’ gendered experiences in the mathematics classroom: “When you’re in a class with such dominant boys, it’s not easy to put yourself forward”
Authors: Hafeez Aleena , Xenofontos Constantinos 
Published: August 2024

AbstractMany studies worldwide conclude that there are no significant differences between the academic performance of boys and girls in school mathematics. In fact, girls are often found to outperform boys in several countries. However, girls and women continue to participate less in mathematics classrooms and have lower enrolment rates in STEM-related subjects. To investigate this paradox, we utilise the theoretical framework of figured worlds (Holland, Lachicotte, Skinner, and Cain in Identity and agency in cultural worlds, Harvard University Press, 1998) and examine how a group of three boys and a group of four girls experience participation in the mathematics classroom. All children had attended the same 9th grade (ages 14–15) in Norway. Based on focus-group and individual interviews with the children, this study identifies three themes around which children construct their experiences: (a) gendered participation in the mathematics classroom, (b) what it means to be a ‘good’ mathematics pupil, and (c) the teacher’s role in fostering pupil participation. In closing, we discuss implications of our work and make recommendations for future research.
Assessing the readiness of Greek municipalities to manage bioplastics in municipal waste management streams
Authors: Barbir Jelena , Lingos Alexandros , Foschi Eleonora , Stasiskiene Zaneta , Skanavis Constantina , Fletcher Carly , Leal Filho Walter 
Published: August 2024

AbstractEach year citizens of the European Union (EU) generate 2.5 billion tonnes of waste; equating to five tonnes of waste per person per year. To ensure optimal material recovery, and to support the move towards a circular economy, proper separate collection of waste is necessary. The current trend of increasing collection rates, encouraged by EU legislation, is promising; however, progress is uneven both across and within EU member states. While European and national targets provide the overarching driver for better waste collection, regional and local implementation is crucial for achieving continued progress. Therefore, it is vital to consider the disparity among the different EU countries when introducing new materials, such as bioplastics (bio-based and/or biodegradable plastics), into current national waste management streams, and any new introductions should be carefully evaluated before further actions are recommended by local authorities. As a member state that is heavily reliant on tourism, proper solid waste management is of vital importance in Greece, especially during the peak summer season. Considering the rapid expansion of bioplastics in the European market, it is important to assess the readiness of municipalities in Greece to manage this new category of solid waste. Data collected from 51 Greek municipalities via questionnaire (distributed to public authorities or waste management companies) showed that the current situation and capacities for adapting waste management streams to process bio-based and/or biodegradable plastics is still limited in Greece. Therefore, the readiness of Greece to process an increasing proportion of bioplastics within the waste stream (using the current waste management systems) is very low, as a result, such innovative materials are currently seen more as a problem than a ready-to-implement solution.
As air relative humidity increases, infectivity of SARS-CoV-2 decreases within water droplets
Authors: Liu Yu , Cao Lei , Xia Yu , Pan Pan , Rao Lang , Chen Bolei , Zare Richard N. 
Published: August 2024

Abstract
Water droplets containing the SARS-CoV-2 virus, responsible for coronavirus 2019 transmission, were introduced into a controlled-temperature and -humidity chamber. The SARS-CoV-2 virus with green fluorescent protein tag in droplets was used to infect Caco-2 cells, with viability assessed through flow cytometry and microscopic counting. Whereas temperature fluctuations within typical indoor ranges (20°C–30°C) had minimal impact, we observed a notable decrease in infection rate as the surrounding air’s relative humidity increased. By investigating humidity levels between 20% and 70%, we identified a threshold of ≥40% relative humidity as most effective in diminishing SARS-CoV-2 infectivity. We also found that damage of the viral proteins under high relative humidity may be responsible for the decrease in their activity. This outcome supports previous research demonstrating a rise in the concentration of reactive oxygen species within water droplets with elevated relative humidity.
Resources and Territorial Claims: Domestic Opposition to Resource-Rich Territory
Authors: Lee Soyoung 
Published: August 2024

AbstractAre states more interested in claiming territories that have economic resources? While previous theories of international relations assume that resources make a territory more tempting to claim, all else equal, I argue that certain types of economic resources can make states less willing to claim a territory. The presence of capital-intensive resources—such as oil or minerals—raises concerns about how the benefits of acquiring the territory would be distributed within the nation. These distributional concerns make it harder and costlier for leaders to mobilize widespread and consistent support for claiming resource-rich lands. Using original geocoded data on territorial claims in South America from 1830 to 2001, I show that states are indeed less likely to claim lands that have oil or minerals, even when they can be claimed for historical or administrative reasons. I then illustrate the theoretical mechanism through a case study of Bolivia, comparing Bolivian attitudes toward reclaiming its two lost provinces, the Chaco and the Litoral. By showing how the presence of economic resources can become a liability in mobilizing unified support, this paper questions the widespread assumption that resources make territories more desirable to claim.
An infrared view of NGC3603
Authors: Castellanos Raúl , Najarro Francisco , Garcia Miriam , Patrick Lee R. , Evans Christopher J. , Bartlett Elizabeth S. , Clark J. S. 
Published: August 2024

AbstractNGC3603 is one of the youngest massive clusters of the Milky Way which uniquely enables studying the interplay between massive star feedback and the surrounding interstellar medium. Yet, a deep infrared (IR) view of the cluster is missing. We present guaranteed time observations of NGC3603 consisting of near infrared spectroscopy taken with VLT-KMOS. This data set will provide a first, rather complete IR census.
Global Properties of Star-Forming Galaxies from Ultraviolet Spectroscopy
Authors: Leitherer Claus , Clark Ilyse , Arellano-Córdova Karla , Berg Danielle A. 
Published: August 2024

AbstractWe analyzed archival HST and IUE ultraviolet spectra of 29 nearby star-forming galaxies. The range of aperture sizes permits studies of the galaxy properties over pc to kpc scales. We measured line strengths and spectral energy distributions over the 1200 – 1300 Åwavelength range and established trends with galaxy properties. Updated oxygen abundances were measured from ancillary optical data. Star-formation rates and internal dust attenuations were derived from comparison with synthesis models. The interstellar absorption lines are heavily saturated, yet scale with oxygen abundance. We interpret this as due to macroscopic velocities arising in a turbulent ISM and large-scale outflows. The stellar-wind lines also scale with oxygen abundance. As these lines are shaped by mass loss, which is driven by the Fe abundance, we can study the α-element/Fe ratio in these galaxies.
HR 6819 – a post-interaction binary system originally thought to be a triple system containing a black hole
Authors: Frost Abigail J. , Bodensteiner Julia , Rivinius Thomas , Baade Dietrich , Merand Antoine , Selman Fernando , Abdul-Masih Michael , Banyard Gareth , Bordier Emma , Dsilva Karan , Hawcroft Calum , Mahy Laurent , Reggiani Maddalena , Shenar Tomer , Cabezas Mauricio , Hadrava Petr , Heida Marianne , Klement Robert , Sana Hugues 
Published: August 2024

AbstractIn 2020, HR 6819 was reported to be a triple system containing the closest black hole to Earth. However, these results were contested, with an alternative explanation of a post-interaction binary suggested. Using new integral field spectroscopic and interferometric data, we have been able to determine the true nature of this exotic source.
Hot stars in the Gaia-ESO Survey
Authors: Blomme R. , Daflon S. , Gebran M. , Herrero A. , Lobel A. , Mahy L. , Martins F. , Morel T. , Berlanas S. R. , Gosset E. , Maíz Apellániz J. ,   GES Working Group 13
Published: August 2024

AbstractThe Gaia-ESO Survey (GES) is a large public spectroscopic survey that has collected spectra of about 100,000 stars. The survey provides not only the reduced spectra, but also the radial velocities, stellar parameters and surface abundances resulting from the analysis of the spectra. We present the work of the groups that analysed the spectra of the hottest stars in that Survey. The large temperature range that is covered (Teff = 7,000 to 50,000 K) requires the use of different analysis codes by the different groups. Eight groups each analysed part of the data, with significant overlap that allowed cross-checks. In total 17,693 spectra of 6,462 stars were analysed, most of them in 37 open star clusters. The homogenisation of all this information led to stellar parameters for 5,584 stars. Abundances for at least one of the elements He, C, N, O, Ne, Mg, Al, Si and Sc were determined for 292 stars. The GES hot star data, as well as the Survey data in general, will be of considerable use in future studies of stellar evolution and open clusters.
Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7
Authors: Ramachandran Varsha 
Published: August 2024

AbstractWe present a detailed spectroscopic analysis of the only known eclipsing high mass X-ray binary with a black hole companion, M33 X-7. We obtained the first UV spectra of the system accompanied by X-ray observations, taken at three key orbital phases. We performed a detailed analysis of X-Ray, UV, and archival optical spectra using stellar atmosphere models which shed light on the interaction of the stellar wind with the black hole. Our new analysis suggests a large reduction in component masses compared to previous results. Our one-dimensional calculations confirm that the photoionization by the X-ray radiation can significantly change the ionization structure and diminish the wind accelerations. For this system standard wind-fed accretion scenario alone cannot explain the observed X-ray luminosity, indicating an additional mass overflow towards the black hole. Our evolutionary models suggest that the system is transitioning towards a common envelope stage in which both components merge.
Slowly-rotating nitrogen-rich O stars in 30 Doradus
Authors: Tramper F. 
Published: August 2024

AbstractThe VLT/FLAMES Tarantula Survey (Evans et al. 2011) identified a group of slowly-rotating nitrogen-rich O-type stars that cannot be explained by current evolutionary models. Here we present high-quality VLT/UVES observations of four of these stars that allow a detailed quantitative spectroscopic analysis. We present the analysis of the spectra with a genetic algorithm, and discuss the future steps to be taken to further investigate the cause of the nitrogen enrichment.
Entrainment in 3D hydrodynamics simulations of neon burning
Authors: Rizzuti F. , Hirschi R. , Georgy C. , Arnett W. D. , Meakin C. , Murphy A. StJ. 
Published: August 2024

AbstractOur knowledge of massive star evolution is limited by uncertainties linked with multi-dimensional processes taking place in stellar interiors. Important examples are convective boundary mixing (CBM) and entrainment, which are implemented in 1D stellar evolution models assuming simplified prescriptions. 3D hydrodynamics models can improve these prescriptions by studying realistic multi-D processes for a short timerange (minutes or hours). In these proceedings, we present results coming from a new set of high-resolution hydrodynamics simulations of a neon-burning shell in a massive star, and discuss how the entrainment law can be calibrated from 3D models and then used to improve 1D stellar evolution prescriptions.
Apsidal motion in NGC 6231: Sounding the internal structure of massive stars
Authors: Rosu S. , Rauw G. , Dupret M.-A. , Noels A. , Farnir M. 
Published: August 2024

AbstractThe young open cluster NGC 6231 hosts a rich population of O-type binary stars. We study several of these eccentric short-period massive eclipsing binaries and assess their fundamental parameters. The properties of these systems make them interesting targets to study tidally induced apsidal motion. The analysis of apsidal motion offers a powerful means to obtain information about the internal structure of the stars. Indeed, since the rate of apsidal motion in a binary system is proportional to the internal structure constants of the stars composing it, its value gives direct insight into the internal structure and evolutionary state of these stars. Stellar evolution models are constructed based on the observationally-determined fundamental parameters and a theoretical rate of apsidal motion is inferred. The results are striking: Adopting standard stellar evolution models yields a theoretical rate of apsidal motion much larger than the observational value. This discrepancy results from the standard models predicting too low an efficiency of internal mixing and thus too homogenous stars in terms of density. By enforcing the theoretical rates of apsidal motion to match the observational values, enhanced mixing is required, through a large overshooting parameter and/or additional turbulent/rotational mixing. Our analysis leads to the conclusion that the chemically mixed cores in those massive stars must be more extended than anticipated from standard models.
Massive star interiors revealed by gravity wave asteroseismology and high-resolution spectroscopy
Authors: Bowman Dominic M. 
Published: August 2024

AbstractIn recent years, it has been discovered that massive stars commonly exhibit a non-coherent form of variability in their light curves referred to as stochastic low frequency (SLF) variability. Various physical mechanisms can produce SLF variability in such stars, including stochastic gravity waves excited at the interface of convective and radiative regions, dynamic turbulence generated in the near-surface layers, and clumpy winds. Gravity waves in particular are a promising candidate for explaining SLF variability as they can be ubiquitously generated in main sequence stars owing to the presence of a convective core, and because they provide the large-scale predominantly tangential velocity field required to explain macroturbulence in spectral line fitting. Here, I provide an overview of the methods and results of studying SLF variability in massive stars from time series photometry and spectroscopy.
SPAMMS: applications and use cases for the 3D spectroscopic analysis technique to study deformed massive stars
Authors: Abdul-Masih Michael 
Published: August 2024

AbstractWhether it be due to rapid rotation or binary interactions, deviations from spherical symmetry are common in massive stars. These deviations from spherical symmetry are known to cause non-uniform distributions of various parameters across the surface including temperature, which can drive internal mixing processes within the envelopes of these massive stars. Despite how common these 3D distortions are, they are often neglected in spectroscopic analyses. We present a new spectral analysis code called spamms (Spectroscopic PAtch Model for Massive Stars) specifically designed to analyze non-spherical systems. We discuss how the code works and discuss its assumptions. Furthermore, we demonstrate how spamms can be applied to a variety of different types of systems and we show how it can model 3D effects in a way that current analysis techniques are not able to.