bluuebunny/crossref_metadata_2025_split huggingface dataset:
In situ characterisation of dynamic fracture in $$Al_2O_3$$ using ultra-fast X-ray phase contrast radioscopy: effects of porosity and crack speed
Authors: Henry Q. , Kopp J.-B. , Le Barbenchon L. , Girardot J. , Lukić B. , Cohen A. , Cosculluela A. , Viot P. 
Published: January 2025

Abstract
The dynamic fracture properties of porous ceramics were studied using single bunch synchrotron X-ray phase contrast imaging. The modified brazilian geometry was used to initiate and propagate a pure mode I crack. The specimen was compressed using the Split Hopkinson bars at strain rates of the order of

$$10^2$$

10
2

s

$$^{-1}$$

-
1

. Main cracks were isolated for four different grades of

$$Al_2O_3$$

A

l
2

O
3

, one dense alumina, and three porous grades with

$$20~\%$$

20

%

to

$$60~\%$$

60

%

porosity. The maximum measured crack velocities for three grades is of the order of

$$0.6c_R$$

0.6

c
R

and

$$0.4c_R$$

0.4

c
R

for the most porous. The fracture energy was estimated using a FE numerical simulation to quantify the influence of inertial effects induced by crack propagation. The results show that these inertial effects are far from negligible (up to

$$80~\%$$

80

%

of the stored energy) and that the dynamic correction factors known from the literature tend to overestimate the fracture energy. The values obtained vary from 22 J/m

$$^2$$

2

for the densest to 5 J/m

$$^2$$

2

for the most porous.
The Climatic Resilience of the Sasanian Empire
Authors: Jacobson Matthew J. , Gascoigne Alison L. , Fleitmann Dominik 
Published: January 2025

Abstract
The Sasanian Empire (224–651 CE) has been given relatively little attention in research on climate-society interactions when compared to the neighboring Byzantine Empire, despite evidence of changing conditions and an agricultural economy that is theoretically vulnerable to droughts due to low annual precipitation. We review the available historical, archaeological, paleo-environmental, and paleo-climatic evidence to assess whether climatic conditions factored into periods of Sasanian growth and decline. We find evidence for drier conditions across Sasanian territories at the turn of the sixth century, a pattern that extends to the Aegean, Anatolia, and Central Asia. These same conditions contributed to a significant decline for the nearby Kingdom of Himyar but occurred alongside a period of expansion and intensification for the Sasanian Empire. We suggest that a combination of careful management of water infrastructure, including qanats, which can conserve water resources during dry periods, and land-use strategies that are both diverse and flexible, may have mitigated the worst impacts of this dry period. However, we note several weaknesses in the available data that still hinder confident interpretations of the potential impacts of climate change in the Sasanian Empire. Notably, there are gaps in the coverage of paleo-hydrological records and a complete lack of terrestrial paleo-temperature records in the region, as well as low resolution and high chronological uncertainties in the archaeological and paleo-environmental evidence.
Edge Laplacians and Edge Poisson Transforms for Graphs
Authors: Arends Christian , Frahm Jan , Hilgert Joachim 
Published: January 2025

Abstract
For a finite graph, we establish natural isomorphisms between eigenspaces of a Laplace operator acting on functions on the edges and eigenspaces of a transfer operator acting on functions on one-sided infinite non-backtracking paths. Interpreting the transfer operator as a classical dynamical system and the Laplace operator as its quantization, this result can be viewed as a quantum-classical correspondence. In contrast to previously established quantum-classical correspondences for the vertex Laplacian which exclude certain exceptional spectral parameters, our correspondence is valid for all parameters. This allows us to relate certain spectral quantities to topological properties of the graph such as the cyclomatic number and the 2-colorability. The quantum-classical correspondence for the edge Laplacian is induced by an edge Poisson transform on the universal covering of the graph which is a tree of bounded degree. In the special case of regular trees, we relate both the vertex and the edge Poisson transform to the representation theory of the automorphism group of the tree and study associated operator valued Hecke algebras.
Race Differences in the Loneliness of Older Adults: Evidence from South Africa
Authors: Posel Dorrit 
Published: January 2025

Abstract
Although the correlates of loneliness among older adults are very well explored in developed countries, there has been far less quantitative research in developing country contexts. This study helps to redress this research lacuna by investigating the loneliness reports of older adults (> 59 years) in South Africa. The analysis focuses on the considerable variation by race in how adults grow old, including in their living arrangements and socio-economic status. Using national micro-data collected in five waves of the National Income Dynamics Study, the study shows that older white adults report significantly fewer episodes of loneliness than other older adults, although they are far more likely to live alone. The gap in loneliness is greatest between older white and older African adults (who are the most likely to live with others), and it persists in multivariate regressions that control for a range of other differences in their individual and household characteristics. One possible explanation for these persistent race differences, which requires further examination, is that they reflect the importance of cultural factors, which are not adequately modelled, and which influence expectations of social interaction.
Enhancing emergency care for older persons: the role and impact of the electronic Frailty Index
Authors: Shiffer Dana , Desai Antonio , Cesari Matteo , Generali Elena , Greco Massimiliano , Savioli Gabriele , Giordano Mauro , Voza Antonio 
Published: January 2025

Abstract
As the elderly population expands, enhancing emergency department (ED) care by assessing frailty becomes increasingly vital. To address this, we developed a novel electronic Frailty Index (eFI) from ED health records, specifically designed to assess frailty and predict hospitalization, in-hospital mortality, ICU admissions, and 30-day ED readmissions. This retrospective, single-center study included patients 65 years old or older who presented to the ED of IRCCS Humanitas Research Hospital in Milan, Italy, between January 2015 and December 2019. Frailty was assessed using a novel electronic Frailty Index (eFI), based on the cumulative deficit model, incorporating 45 health deficits to quantify frailty. Patients were divided into four quartiles based on eFI scores to explore the association between frailty levels and adverse outcomes, including hospitalization, in-hospital mortality, ICU admission, and 30-day ED readmission. The study included 21,537 patients (mean age 77.4, 50.7% males). The median eFI score was 0.16. Hospitalization rates rose significantly with frailty, from 20% in the least frail quartile to 43% in the most frail. Similarly, in-hospital mortality and ICU admissions increased markedly with higher eFI scores, with mortality rates climbing from 0.44 to 5.0% across quartiles. The 30-day ED readmission rates significantly rose from 9.9 to 19.8%. For every 0.01 increase in eFI score, the odds of hospitalization, in-hospital mortality, ICU admission, and 30-day ED readmission significantly increased (P < 0.0001). Specifically, the adjusted odds ratios (OR) for hospitalization, in-hospital mortality, ICU admission, and ED readmission rose to 3.55, 14.15, 4.70, and 2.22, respectively (P < 0.0001), in the most frail compared to the least frail quartile. The integration of the eFI into ED settings can enable more precise risk stratification and resource allocation, significantly improving patient management and healthcare delivery for older persons in these urgent care contexts.
EduStudio: towards a unified library for student cognitive modeling
Authors: Wu Le , Chen Xiangzhi , Liu Fei , Xie Junsong , Xia Chenao , Tan Zhengtao , Tian Mi , Li Jinglong , Zhang Kun , Lian Defu , Hong Richang , Wang Meng 
Published: January 2025

Abstract
Student cognitive modeling is a fundamental task in the intelligence education field. It serves as the basis for various downstream applications, such as student profiling, personalized educational content recommendation, and adaptive testing. Cognitive Diagnosis (CD) and Knowledge Tracing (KT) are two mainstream categories for student cognitive modeling, which measure the cognitive ability from a limited time (e.g., an exam) and the learning ability dynamics over a long period (e.g., learning records from a year), respectively. Recent efforts have been dedicated to the development of open-source code libraries for student cognitive modeling. However, existing libraries often focus on a particular category and overlook the relationships between them. Additionally, these libraries lack sufficient modularization, which hinders reusability. To address these limitations, we have developed a unified PyTorch-based library EduStudio, which unifies CD and KT for student cognitive modeling. The design philosophy of EduStudio is from two folds. From a horizontal perspective, EduStudio employs the modularization that separates the main step pipeline of each algorithm. From a vertical perspective, we use templates with the inheritance style to implement each module. We also provide eco-services of EduStudio, such as the repository that collects resources about student cognitive modeling and the leaderboard that demonstrates comparison among models. Our open-source project is available at the website of edustudio.ai.
The Effects of International Technology Spillover Channels on Innovation Performance: An Application on Turkish Manufacturing Industry
Authors: Bostan Fikret , Karadağ Metin 
Published: January 2025

Abstract
The increasing pressure of competition in a globalizing world forces the countries to strengthen their market shares in order to grow rapidly. This requires to have technological innovation, and scientific knowledge, as the primary sources. Hence, the main aim of this study is to investigate the effects of international technology spillover channels on the innovation performance of firms operating in the Turkish manufacturing industry. For the aim of the study, the System Generalized Moments Method (SGMM) was used for the estimation of the models. Micro data of the 311 firms covering the period of 2011–2015 were obtained from the Turkish Statistical Institute (TURKSTAT). The results of the study show that domestic R&D stock and especially technology absorptive capacity have significant and strong positive effects on the new product sales of the firms. Also, the findings indicate that the international technology spillover channels which have the most important impact on the innovation performance is foreign direct investments (FDI), and this is followed by the export channel. Depending on the conditional values of technology absorptive capacity in the manufacturing industry, the marginal effects of international technology spillover channels on new product sales differ. As a matter of the fact, when the share of technology absorptive capacity increases, the marginal effects of FDI on new product sales decrease, while the marginal effects of export and technology transfer expenditures increase. As a result, the government should increase the sales of new products of firms by encouraging domestic R&D activities and FDI, thus laying the groundwork for the high and stable economic growth rates.
The positioning of quality and expertise in initial teacher education: policy enactment in the Australian context
Authors: Ryan Mary , Van Bergen Penny , Adlington Rachael , Maurice Olivia 
Published: January 2025

Abstract
Teacher quality and teacher education improvement have been central discourses for at least two decades in global education. In Australia, despite the pervasive nature of these discussions, there is a lack of substantial evidence indicating the existence of a problem in this regard. Policies aimed at enhancing the ‘preparedness’ of teacher graduates and elevating the ‘quality’ of ITE programs have nonetheless emerged as prevalent solutions over the past decade. The latest enactment of reforms in the policy chain is the Strong Beginnings report from the Teacher Education Expert Panel. In this paper, we align with Ball’s perspective that policy should be viewed as a dynamic process rather than a presumed, ready-made solution to a problem. We utilise systematic conceptual coding using Leximancer to enable a nuanced exploration of the understandings, practices, and conditions of influence for the policy actors inscribed in the TEEP report. We also analyse concept frequency and collocation in the final Strong Beginnings report, noting two main propositions: first, that there is a problem with quality in ITE; and second, that practice is foregrounded in professionalisation. We highlight the consistencies and contradictions within the discourses of the final report and the submissions from policy actors that contributed to this policy enactment process. We suggest that evidence is used when it suits a policy position, but ignored if it disrupts the platform position. We conclude by arguing that the policy actors in this policy enactment process should be afforded the professional authority to continue a well-established process of continual improvement.
The effect of the synthesis temperature and time on the formation of boron suboxide
Authors: Karamete Tuba , Biçer Hülya , İyi Çağan Berker , Tuncer Mustafa , Göçmez Hasan 
Published: January 2025

Abstract
Boron suboxide (B6O), offering a good balance between abundance of its constituents and promising tribological performance, is intriguing. Applications such as cutting tools, high-wear resistant coatings, and ballistics would benefit from such properties, however a feasible synthesis method is yet to be realized. The synthesis of B6O under atmospheric pressure is a challenging pursuit, and there is insufficient thermodynamic data for the formation of boron suboxide in the literature. In this study, boron suboxide powder was synthesized by reducing B2O3 by amorphous boron. Phase analysis of the formation of boron suboxide was demonstrated within the temperature range of 1200–1350 °C. The amorphous phase beside boron suboxide is present for all temperature treatments, but the best fitting crystalline phase was observed of the powder synthesized at 1300 °C. The powder was also heat treated at 1300 °C for various hours (2–6 h), and the crystalline phase was only observed for the powder heat treated for 4 h. The morphology of synthesized powder exhibited a star-like morphology. The production of B6O-TiB2 composite powder by reduction of TiO2 by amorphous boron with the excess addition of boron is also reported in this study.
Optimization of laser process parameters and improved corrosion behaviour of LZ/YSZ thermal barrier coating
Authors: Avcı Ali , Karabaş Muhammet , Eker Ayşegül Akdoğan , Akman Erhan 
Published: January 2025

Abstract
Laser processing the surfaces of plasma-sprayed thermal barrier coatings is one of the methods used to improve the corrosion resistance of the coatings. However, laser glazing alone is not sufficient to fully protect coatings from corrosion. In this study, optimum laser surface modification parameters were determined for plasma-sprayed LZ/YSZ double-layer thermal barrier coatings. The coating surface, whose entire surface was scanned with optimum parameters, was modified with nano YSZ using the electrophoretic deposition technique. Thus, the network cracks formed during laser glazing were filled with nano YSZ. The coating modified by laser and electrophoretic deposition processes was subjected to corrosion tests. As a result of the characterizations, it was determined that the optimum laser surface modification parameters for LZ/YSZ thermal barrier coatings were 200 mm laser distance, 120 scan speed, and 28w laser power. With these parameters, discontinuities on the as-sprayed coating surface were eliminated. A dense layer was successfully created on the LZ layer. As a result of the corrosion tests, it was determined that modifying the laser-glazed surface with nano YSZ reduced the penetration depth of corrosive contaminants. Thus, the glassy melt and hot corrosion resistance of LZ/YSZ thermal barrier coatings was increased.
Comparative economic analysis of batch vs. continuous manufacturing in catalytic heterogeneous processes: impact of catalyst activity maintenance and materials costs on total costs of manufacturing in the production of fine chemicals and pharmaceuticals
Authors: Mendoza Suarez F. , Tatarchuk B. 
Published: January 2025

Abstract
To evaluate the feasibility of transforming batch manufacturing processes in the fine chemicals and pharmaceutical industries to continuous synthesis, Capex, Opex and the total cost of manufacturing are estimated for production facilities for the hydrogenation of a nitro compound to its final amino counterpart. Two cases are evaluated: First, a high annual production dedicated plant, designed on the basis of processing 100,000 kg of the principal raw material per year, where raw materials cost, catalyst cost, and catalyst activity maintenance are varied over a broad range for typical industrial cases. Second, a “short campaign” model for a small volume production trial setup designed for the manufacture of only 100 kg of the final product, as a way to evaluate relevant industrial scenarios of scale-up and process development. A comparison is made between slurry batch, catalyst basket batch reactor and fixed bed continuous reactor manufacturing facilities. The hydrogenation of 2,4-dinitrotoluene was chosen as a probe reaction for the development of the manufacturing processes, with costs of the key raw material varying between $5 and $100 per kilogram, costs of catalyst varying between $100 and $1,500 per kilogram, and catalyst activity maintenances varying between 1,000 and 2,000,000 total turnovers before a change in catalyst load is necessary. For low catalyst activity maintenance, the total manufacturing costs for the fixed bed reactor process were always found to be higher than those of the two other alternatives. As catalyst activity maintenance increases, the manufacturing costs for the continuous alternative rapidly fall, reaching savings between 37 and 75% compared to the base batch reactor case, depending on the combination of costs of the key raw material and catalyst used.

Graphical Abstract
Cybersecurity investments and cyber insurance purchases in a non-cooperative game
Authors: Boonen Tim J. , Feng Yang , Tong Zhiwei 
Published: January 2025

Abstract
The growing concern over cyber risk has become a pivotal issue in the business world. Firms can mitigate this risk through two primary strategies: investing in cybersecurity practices and purchasing cyber insurance. Cybersecurity investments reduce the compromise probability, while cyber insurance transfers potential losses to insurers. This study employs a network model for the spread of infection among interconnected firms and investigates how each firm’s decisions impact each other. We analyze a non-cooperative game in which each firm aims to optimize its objective function through choices of cybersecurity level and insurance coverage ratio. We find that each firm’s cybersecurity investment and insurance purchase are strategic complements. Within this game, we derive sufficient conditions for the existence and uniqueness of Nash equilibrium and demonstrate its inefficiency. These theoretical results form the foundation for our numerical studies, allowing us compute firms’ equilibrium decisions on cybersecurity investments and insurance purchases across various network structures. The numerical results shed light on the impact of network structure on equilibrium decisions and explore how varying insurance premiums influence firms’ cybersecurity investments.
Reparations for Corporate Involvement in War Crimes: The Lundin Trial and Prospects for Victims’ Justice
Authors: Holm Fanny 
Published: January 2025

AbstractIn September 2023, the trial at Stockholm District Court against Orrön Energy (previously Lundin Energy) and two corporate directors for complicity in war crimes in Sudan between 1999 and 2003, started. The Lundin case is part of a trend of attempts to hold corporations criminally accountable for their alleged involvement in serious human rights abuses and provides a unique opportunity to assess the possibilities of such attempts in relation to the rights of the victims. This article analyzes how human rights obligations and the objectives of reparations for victims are satisfied by Swedish law and practice in the Lundin trial. It shows that while the law allows victims participating in trial to put forward civil claims, it denies this right to the large number of victims not participating, and the decision early in the Lundin proceedings to separate damage claims from the criminal trial has left the participating victims effectively denied reparations.
Marital Status and Parkinson Disease in Eastern Compared to Western Countries: A Systematic Review and Meta-Analysis
Authors: Chua Wei Yu , Chan Claire Kar Min , Wang Jia Dong James , Chan Ling-Ling , Tan Eng-King 
Published: January 2025

ABSTRACT

Background:
Parkinson disease (PD) is a neurological disorder that affects more than 10 million people worldwide, impacting both quality of life and marital relationships. Divorce rates are higher in Western compared to Eastern countries. However, it is unclear if there are differences in marital status after PD onset between the two regions.

Methods:
We searched MEDLINE and Embase from inception to March 31, 2024. Original studies discussing marital status in participants with PD were included. An unmarried status includes single, widowed, divorced or separated. Outcomes included the prevalence of being unmarried, measured as proportions, and the risk ratio (RR) of being unmarried in participants with PD relative to controls.

Results:
Out of 567 studies screened initially, 55 studies involving 3,723,966 participants were included. The prevalence of being unmarried was evaluated in 55 studies (25.16%; 95% CI: 21.52–29.18). The prevalence of being unmarried was significantly higher in countries in the West compared to the East (28.83%; 95% CI: 25.09–32.89 vs 17.47%; 95% CI: 12.10–24.57, p < 0.01). Compared to controls, the risk of being unmarried in PD participants after the onset of PD was significantly higher in the East (RR: 1.21, 95% CI: 0.91–1.60) compared to the West (RR: 0.87, 95% CI: 0.65–1.15).

Conclusions:
Our meta-analysis showed significantly higher rates of being unmarried in Western compared to Eastern countries. After PD onset, participants in the East were at significantly higher risk of being unmarried compared to participants in the West, suggesting that differences in cultural practices, societal norms and healthcare systems may affect marital status outcomes in PD participants.