bluuebunny/crossref_metadata_2025_split huggingface dataset:
How Do GCC Countries Stocks Interact With US and European Debt Markets?
Authors: Hanif Waqas , El Khoury Rim , Gubareva Mariya 
Published: February 2025

ABSTRACTThis study conducts a comprehensive analysis of interconnectedness in Gulf Cooperation Council (GCC) equity markets and global bond markets, primarily focusing on European Monetary Union (EMU) and US bonds, from July 2007 to September 2023. Using innovative methodologies such as quantile connectedness and quantile coherency, we capture the dynamic relationships across different market conditions, particularly during extreme events. The quantile connectedness includes a moderate to low degree of interconnectedness during normal market conditions, intensifying during extreme market conditions. The United Arab Emirates (UAE) and Saudi Arabia are identified as influential players, transcending borders to impact returns in other GCC markets. Roles of GCC countries as net transmitters or receivers of returns shift over time, necessitating adaptable investment strategies. The interconnectedness of GCC markets with bonds responds differently to global crises and turbulences, including geopolitical and health crises. Our quantile coherence analysis provides insights for risk management and portfolio allocation. These findings have crucial implications for investors, encouraging adaptive asset allocation strategies, and for policymakers to monitor intra‐regional spillovers in shaping market dynamics.
Impacts of COVID‐19 on early childhood mental health
Authors: Marsolek Marissa , Dowell Kathy 
Published: February 2025

AbstractThis study investigates the impact of the COVID‐19 pandemic on young children's mental health and their engagement in mental health services in the midwestern United States. Previous research investigating the impact of COVID‐19 on young children's mental health service utilization has rarely included children under 5 years. Therefore, this study examined how the COVID‐19 pandemic and the caregiver‐child relationship impacted children's mental health symptoms. It also investigated the impact of COVID‐19 and the child's symptom presentation on caregivers’ engagement and attendance in mental health treatment. Data were collected with children 0 to 5 years old (n = 486) from January 2017 to April 2022 using archival records from a community mental health organization. Participants were primarily low‐income (81.9%) and White (81.3%). Results found that the caregiver‐child relationship impacted children's mental health symptoms before and during the COVID‐19 pandemic. Both caregivers and children were rated as more engaged after the pandemic began if the child experienced externalizing symptoms. Children attended fewer therapy sessions after the pandemic started, and those with externalizing symptoms received more overall services than those without.
Vitamin D Screening and Supplementation—A Novel Approach to Higher Success: An Update and Review of the Current Literature
Authors: Wiedemann Thomas G. , Jin Hyun Woo , Gallagher Brendan , Witek Lukasz , Miron Richard J. , Talib Huzefa S. 
Published: February 2025

ABSTRACTIn recognizing the critical role of vitamin D in bone metabolism and osseointegration, research aims to identify whether preoperative vitamin D deficiency serves as a risk factor for early implant failure. By analyzing patient outcomes and their serum vitamin D levels, studies seek to establish evidence‐based recommendations for vitamin D assessment and management in the preoperative period, with the ultimate goal of enhancing implant success rates and patient outcomes in dental implantology. Given these insights, it is important for clinicians to incorporate the preoperative evaluation of vitamin D serum levels into their standard protocol for patients undergoing dental implant procedures. The objective of this study is to review and investigate the correlation between early dental implant failure (EDIF) and reduced serum levels of vitamin D, and to evaluate the potential benefits of preoperative screening and supplementation of vitamin D in patients undergoing dental implant surgery. A literature review was performed using a selected database—PubMed, Google Scholar, Cochrane, and SCOPUS—to assess the effect of vitamin D3 level on EDIF and biological factors (i.e., peri‐implant bone level). Studies were limited to peer‐reviewed, indexed journals. Subsequently, a hypothesis was proposed that vitamin D3 supplementation would mitigate the negative effect of vitamin D3 deficiency. The potential benefit of vitamin D3 supplementation—systemic and topical—was assessed in terms of bone‐to‐implant contact (BIC) and peri‐implant bone level. The deleterious effects of low vitamin D serum levels on osseointegration of dental implants and immune system modulation are increasingly accepted. Evidence has displayed that deficiency of this vitamin can result in impaired peri‐implant bone formation. Vitamin D deficiency resulted in nearly a fourfold increase in overall EDIF incidence. Presurgical supplementation of vitamin D3 demonstrated increased levels of implant osseointegration, increased bone–implant contact, enhanced bone level maintenance, and decreased EDIF even in at‐risk demographics (i.e., diabetic subjects). The findings of this study reinforce the role of vitamin D in dental implant osseointegration. Our study, particularly, emphasizes the necessity of vitamin D supplementation for individuals with sub‐physiologic vitamin D serum levels (≤ 30 ng/mL) and those within specific risk categories: smokers, diabetics, obese individuals, and those with compromised immune systems. Adopting a proactive management plan, including screening and supplementation in these patients, may substantially enhance the clinical outcomes in dental implant surgery.
Theoretical exploration on excited state behaviors for 2‐(1H‐benzo[d]imidazole‐2‐yl)‐6‐(benzo[d]‐thiazol‐2‐yl)‐4‐bromophenol in nonpolar and polar solvents
Authors: Fu Xiaoyi , Chen Jiahe , Wang Qing , Xu Wenjing , Zhao Jinfeng 
Published: February 2025

AbstractGiven the potential significance of novel organic fluorophores with potential dual‐way proton transfer (PT) reaction channels, in this work we mainly focus on probing into the excited state behaviors for the novel 2‐(1H‐benzo[d]imidazole‐2‐yl)‐6‐(benzo[d]‐thiazol‐2‐yl)‐4‐bromophenol (BIBTB) fluorophore. Given the two‐way PT channels, we firstly check the stable form with hydroxyl points to imidazole and thiazole rings in solvents with different polarities. By twisting dihedral angles (θ1, θ2 and θ3) in the S0 state, we theoretically verify that the A form (hydroxyl points to thiazole ring) should be the most important part in nonpolar and moderately polar solvents, while the D structure (hydroxyl points toward imidazole ring) becomes more important in polar solvents. Mainly focusing on nonpolar cyclohexane (CYC) and polar acetonitrile (ACE) solvents, we compare the geometrical changes and infrared (IR) vibrational spectral behaviors related to hydrogen bonds. The charge reorganization resulting from frontier molecular orbitals (MOs) and predicted hydrogen bonding energies further reflects the excited state intramolecular proton transfer (ESIPT) tendency. By constructing potential energy curves (PECs) and searching for transition state (TS) forms, we confirm and expound the ultrafast ESIPT mechanism for the BIBTB fluorophore.
Faster Deliveries and Smarter Order Assignments for an On‐Demand Meal Delivery Platform
Authors: Mao Wenzheng , Ming Liu , Rong Ying , Tang Christopher S. , Zheng Huan 
Published: February 2025

ABSTRACTThe rapid growth of on‐demand meal delivery platforms has heightened competition, making customer retention a critical priority. While prior research on order dispatch algorithms has largely focused on minimizing delivery time or delay, the direct impact of delivery performance on repeat purchases remains underexplored. Using transactional data from an online meal delivery platform in China, we empirically investigate the asymmetric effects of early and late deliveries on customer repurchasing behavior. To address potential endogeneity, we introduce driver experience and local knowledge, two previously overlooked factors in platform algorithms, as novel instrumental variables. The survival analysis shows that late deliveries significantly reduce future orders, while early deliveries provide only limited benefits. Guided by these empirical insights, we develop a simulation‐based evaluation of different order dispatch algorithms, revealing that maximizing future orders, rather than minimizing delivery time or delays, yields the highest future orders. These insights offer actionable recommendations for platform managers, stressing the importance of strategic adjustments in dispatch algorithms and integrating heterogeneous treatment effects into algorithmic design. By merging operational delivery performance with consumer behavior insights through causal inference and optimization, this study provides a novel end‐to‐end framework for creating data‐driven dispatch algorithms that enhance both service efficiency and customer retention.
Symptoms predict total knee arthroplasty more than osteoarthritis severity: A multivariable analysis of more than 7500 knees
Authors: Bianco Prevot Luca , Bensa Alessandro , Peretti Giuseppe , Filardo Giuseppe 
Published: February 2025

AbstractPurposeMultiple clinical factors may concur to determine the clinical trajectory leading towards total knee arthroplasty (TKA) in patients affected by knee osteoarthritis (OA). The aim of this study was to identify the main factors influencing progression to TKA in a large population of knee OA patients.MethodsA total of 7552 knees were selected from the Osteoarthritis Initiative (OAI) multicentre database. The data collected included demographic data, Kellgren–Lawrence (KL) grade, the presence of knee swelling, the frequency of swelling, visual analogue scale (VAS) for pain, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), Knee Injury and Osteoarthritis Outcome Score (KOOS) and the number of knees requiring TKA. The baseline data were collected as reported by the OAI database, and patients were followed up at 12, 24, 36, 48, 60, 72, 84 and 96 months, documenting whether they underwent TKA during this period.ResultsA multivariable analysis was performed to identify factors independently influencing progression to TKA. At 96 months, 7.1% of knees underwent TKA. The progression to TKA correlated with age (p < 0.001), KL grade (p < 0.001), swelling frequency (p < 0.001), knee swelling (p < 0.001), VAS (p = 0.003) and KOOS (p < 0.001). Knees with KL Grades 3 and 4 had the same risk of undergoing this procedure, while the need for TKA was able to be predicted based on WOMAC pain (p = 0.035, hazard ratio [HR] = 0.864), VAS (p = 0.008, HR = 1.131) and KOOS (p = 0.02, HR = 0.966).ConclusionsThis study revealed that several factors influenced progression to TKA, including age, KL grade, knee swelling, VAS pain and KOOS. However, there was no statistically significant difference between KL 3 and KL 4 in predicting the disease trajectory, and patients' clinical symptoms, as quantified by WOMAC pain subscale, VAS and KOOS, had a greater influence on progression to TKA than knee KL OA severity.Level of EvidenceLevel IIb.
Entropic Repulsion and Local Order in Doubly Tethered Polymers on a Surface
Authors: Chu Min , Heermann Dieter W. 
Published: February 2025

AbstractThe behavior of (athermal) mobile doubly tethered polymers (ring‐like in 3D) is investigated, on a 2D substrate using the bond fluctuation model. The end‐monomers can move laterally within a constrained distance range. Conformational properties of loop polymers are analyzed and specifically the ordering of the 2D system of end‐monomers. For this, the director is considered between the end‐monomers for local ordering. As tethering density increases, a transition from mushroom‐like conformations to nearly upright structures is observed, as is the case for linear grafted polymers. The effects of loop repulsion are explored, i.e., entropic repulsion, and tethering density on the order parameter and orientational correlations of the directors in 2D. Despite the lack of a global phase transition, local orientational order emerges in 2D due to loop interactions in 3D.
The Mediating Role of Psychological Flexibility in the Relationship Between Fears of Compassion and Mindfulness in Teachers
Authors: Demirci Seyrek Özgür , Genç Ahmet , Ersanlı Ercümend 
Published: February 2025

ABSTRACTTeachers face a variety of challenges and stressors that can erode their well‐being over a long period. Compassion and mindfulness are known to affect teachers' social‐emotional competence. Psychological flexibility means that individuals accept things beyond their control and are determined to continue the actions that can make their lives meaningful. This study aims to investigate the mediating role of psychological flexibility in the relationship between teachers' mindfulness and fears of compassion. This research is based on a cross‐sectional survey design. The study sample consists of 251 teachers. The instruments used include the Fears of Compassion Scale, the Mindfulness teachers'in Teaching Scale, the Acceptance and Action Questionnaire II, and a researcher‐developed personal information form. Findings indicate that psychological flexibility plays a partial mediating role in the relationship between mindfulness in teaching and fears of compassion. Based on the research findings, it can be argued that mindfulness in teaching, psychological flexibility, and fears of compassion are important in the classroom for both teachers and students. The foundational elements of psychological flexibility (e.g., being present at the moment, acceptance, diffusion, contextual self, values, and the ability to act in line with these values) can contribute to nurturing teachers' mindfulness skills in teaching. This, in turn, facilitates teachers in creating a compassionate, democratic, and supportive classroom atmosphere for students.
Increase the Reliability of SERS Measurements for Sodium Metabisulfite Using Highly Uniform AgNPs on Plasma‐Treated PDMS Substrate
Authors: Nguyen Nga Thi Hang , Nguyen Toan Duc , Nghiem Lien Thi Ha , Nguyen Ngoc Thi Bich , Nguyen Kha Van , Nguyen Nghia Trong , Vu Duong 
Published: February 2025

ABSTRACTThe surface‐enhanced Raman scattering (SERS), dependent on metal nanoparticle substrate structure and morphology, presents a powerful analytic tool across diverse fields such as food safety, environmental analysis, and biomedical. Hard substrate materials such as Si, glass, and metal are often used in experimental research. They are highly stable and easy to manufacture. However, the surfaces of actual samples usually have different shapes, making using rigid substrates challenging, so developing flexible SERS substrates is necessary. In this study, we focused on developing blanket substrates using polydimethylsiloxane (PDMS) by spin coating with the substrate area concealed and treated with argon plasma jet. In the plasma‐treated area, the PDMS surface is transformed into a hydrophilic form, causing the metal nanoparticles to spread into a flat, even layer and evaporate quickly, leading to a better SERS effect when analyzing liquid samples. The results show that the limit of detection (LOD) of sodium metabisulfite (SM) is up to 0.01 mg/mL with a relative standard deviation (RSD) of 15.88%.
How Do Resource Efficiency and Environmental Innovation Affect Greenhouse Gas Emissions? Evidence From E‐7 Countries
Authors: Bozkaya Şeyma , Duran Feride , Bekun Festus Victor 
Published: February 2025

ABSTRACTThis study investigates the determinants of environmental quality in China, India, Russia, Brazil, Mexico, Turkey, and Indonesia (E‐7 countries) using annual frequency data from 1990 to 2019. Feasible generalized least squares (FGLS) is used, while panel corrected standard error estimator (PCSE) is employed as a control estimator. The dependent variable representing the environmental quality indicator is greenhouse gas emissions (GHG). Furthermore, the analysis includes following five variables that are assumed to determine environmental quality: (i) resource efficiency; (ii) renewable energy consumption (REC); (iii) growth; (iv) environmental technologies; and (v) energy efficiency. In the estimated model, GHG is used to represent environmental pollution. Conversely, the independent variables are mostly environmentally friendly variables. The results reveal that GDP, REC, and environmental technologies increase GHG emissions, while resource efficiency and energy efficiency have a positive effect on environmental quality. These findings suggest that, in shaping their environmental policies, E‐7 countries consider economic growth, environmental protection, and sustainability. The study concludes with a discussion of further policy insights.
Die sozialen Kosten des Verkehrs: subjektive Wahrnehmungen und objektive Berechnungen
Authors: Creutzig Felix , Javaid Aneeque , Gössling Stefan 
Published: February 2025

Zusammenfassung
Die privaten Kosten des Autos werden in Deutschland um ca. 5000 € pro Jahr unterschätzt. Die Wahrnehmung dieser Kosten würde eine Reduktion des Autoverkehrs zur Folge haben. Soziale Kosten des Verkehrs umfassen Staukosten, ungerechte Flächenverteilung, lokale Umwelt- und Gesundheitsfolgekosten sowie Klimafolgekosten. Die von der Gesellschaft getragenen Kosten der Automobilnutzung sind ebenfalls ca. 5000 € pro Jahr pro Auto und höher in der Stadt als auf dem Land. Eine höhere Kostentransparenz in der Autonutzung, eine Einpreisung der sozialen Folgenkosten und eine gerechtere Flächenverteilung in Städten würden sowohl dem Klimaschutz als auch dem Wohlergehen aller Menschen zu Gute kommen.
Sails for universal quadratic forms
Authors: Kala Vítězslav , Man Siu Hang 
Published: February 2025

Abstract
We establish a new connection between sails, a key notion in the geometric theory of generalised continued fractions, and arithmetic of totally real number fields, specifically, universal quadratic forms and additively indecomposable integers. Our main application is to biquadratic fields, for which we show that if their signature rank is at least 3, then ranks of universal forms and numbers of indecomposables grow as a power of the discriminant. We also construct a family in which these numbers grow only logarithmically.
Winner-take-all games: existence of equilibria and three player dice
Authors: Alpern Steve 
Published: February 2025

Abstract
In many competitive situations, the aim of a player is not to maximize his ‘score’ but rather its rank among other scores. Think sales contests or mutual fund rankings. Following E.J. Anderson’s game of two players entering fair casinos trying to leave with the most money, Alpern and Howard abstracted to the following winner take all game: Each player chooses a distribution from a given set. The distributions are sampled independenly and the player with the highest sample (the winner) gets a unit prize. In case of a tie the winners split the prize. An example of such a two person game is by Bell and Cover in the context ot finance, where the set is all distributions on the unit interval with mean 1/2 and the solution is the uniform distribution. Alpern and Howard extended this and solved many other such games, including two person fair dice (mean 3.5), where the solution is the usual equiprobable die. This paper establishes the existence of equilibria for games where the sets of distributions are those supported on the unit interval with no interior atoms. In addition, we solve the three player game with fair dice, where the usual equiprobable die does not form an equilibrium (only faces 1, 2, 3 and 6 have positive probability at equilibrium). We also solve the limiting case of k sided dice, where players pick any point in

$$\left[ 0,1\right]$$

0
,
1

according to a distribution with mean 1/2.
A comprehensive survey of soil microbial diversity across the Antarctic continent
Authors: Dragone Nicholas B. , Childress Mary K. , Vanderburgh Caihong , Willmore Rachel , Hogg Ian D. , Sancho Leopoldo G. , Lee Charles K. , Barrett John E. , Quandt C. Alisha , LeMonte Joshua J. , Adams Byron J. , Fierer Noah 
Published: February 2025

Abstract
Antarctic soils are unique from those found nearly anywhere else on Earth yet can still harbor a broad diversity of microorganisms able to tolerate the challenging conditions typical of the continent. For these reasons, microbiologists have been drawn to Antarctica for decades. However, our understanding of which microbes thrive in Antarctic soils and how they to do so remains limited. To help resolve these knowledge gaps, we analyzed a collection of 200 archived Antarctic soils—from Livingston Island on the Antarctic Peninsula to Cape Hallett in northern Victoria Land. We analyzed the prokaryotic and fungal communities in these soils using both cultivation-independent marker gene sequencing and cultivation-dependent approaches (microbial isolation), paired with extensive soil geochemical analyses. Our cultivation-independent analyses indicate that colder, saltier, and drier soils harbor less diverse communities of bacteria and fungi, distinct from those found in soils with less challenging conditions. We also built a culture collection from a subset of these soils that encompasses more than 50 bacterial and fungal genera, including cold-tolerant organisms, such as Cryobacterium and Cryomyces. By directly comparing the diversity of our cultured isolates against our cultivation-independent data, we show that many of the more abundant Antarctic taxa are not readily cultivated and highlight bacterial and fungal taxa that should be the focus of future cultivation efforts. Together, we hope that our collection of isolates, the comprehensive data compiled from the cultivation-independent analyses, and our geochemical analyses will serve as a community resource to accelerate the study of Antarctic soil microbes.