bluuebunny/crossref_metadata_2025_split huggingface dataset:
Non-relativistic string monodromies
Authors: Fontanella Andrea , García Juan Miguel Nieto , Sax Olof Ohlsson 
Published: January 2023

Abstract
Spectral curve methods proved to be powerful techniques in the context of relativistic integrable string theories, since they allow us to derive the semiclassical spectrum from the minimal knowledge of a Lax pair and a classical string solution. In this paper we initiate the study of the spectral curve for non-relativistic strings in AdS5 × S5. First, we show that for string solutions whose Lax connection is independent of σ, the eigenvalues of the monodromy matrix do not have any spectral parameter dependence. We remark that this particular behaviour also appears for relativistic strings in flat space. Second, for some simple non-relativistic string solutions where the path ordered exponential of the Lax connection can be computed, we show that the monodromy matrix is either diagonalisable with quasi-momenta independent of the spectral parameter, or non-diagonalisable. For the latter case, we propose a notion of generalised quasi-momenta, based on maximal abelian subalgebras, which retain a dependence on the spectral parameter.
Comparison of orthodontic treatment need and malocclusion prevalence according to KIG, ICON, and mIOTN in German 8- to 9-year-old children of the Sixth German Oral Health Study (DMS 6)
Authors: Kirschneck Christian , Kuhr Kathrin , Ohm Cristiana , Frenzel Baudisch Nicolas , Jordan Andreas Rainer 
Published: February 2023

Abstract
Purpose
The aim of the present study was to compare the malocclusion indices KIG (Kieferorthopädische Indikationsgruppen, Orthodontic Indication Groups), ICON (Index of Complexity, Outcome and Need), and mIOTN (modified Index of Orthodontic Treatment Need) regarding differences in malocclusion prevalence and their assessment of orthodontic treatment need in German 8‑ to 9‑year-old children of the Sixth German Oral Health Study (Deutsche Mundgesundheitsstudie, DMS 6).

Methods
The necessary data for the calculation of the KIG, mIOTN, and ICON were collected by a dentist as part of a clinical orthodontic examination during the field phase of the DMS 6 and by a subsequent digital orthodontic model–analytical evaluation of intraoral scans of the dental arches and the occlusal situation in habitual occlusion.

Results
Prevalence, severity, and treatment need of tooth and jaw misalignments differed in part considerably depending on the index used for assessment. On the other hand, there were several outcomes which yielded quite similar results for the different indices used, such as orthodontic treatment need, which ranged from 40.4% (KIG) over 41.6% (ICON) to 44.2% (mIOTN). Interestingly, orthodontic treatment need for the individual subject could differ considerably, when assessed using different indices.

Conclusions
In general, the results show that the mIOTN is much more conservative in assessing malocclusion prevalences often being smaller than those derived by KIG or ICON. In contrast, KIG and ICON often yield similar prevalences with certain distinct differences due to discrepancies in the respective definitions and also clearly differentiate between treatment possibility and arbitrarily determined treatment need.
Nichtinanspruchnahme medizinischer Leistungen in der COVID-19-Pandemie bei Personen mit chronischen Erkrankungen
Authors: Schäfer Ines , Haack Alena , Neumann Marie , Koch-Gromus Uwe , Scherer Martin , Petersen Elina 
Published: February 2023

Zusammenfassung
Einleitung
Die COVID-19-Pandemie wirkt sich auch auf die medizinische Versorgung anderer Erkrankungen aus. Differenziert zwischen patient:innen- und anbieter:innenseitigen Gründen wurde untersucht, inwieweit Personen mit chronischen Erkrankungen vom Aussetzen medizinischer Versorgungsleistungen betroffen sind.

Methoden
Es wurde eine Querschnittstudie auf Datenbasis der Kohortenstudie Hamburg City Health Study (HCHS) durchgeführt. Die Studienpopulation bestand aus allen HCHS-Teilnehmer:innen (Stichprobe der Bevölkerung Hamburgs, 45–74 Jahre) zwischen April 2020 und November 2021. Über das „COVID-19-Modul“ der HCHS wurde die Inanspruchnahme von Versorgungsleistungen erhoben. Als Grunderkrankungen wurden u. a. Herz-Kreislauf‑, Nieren- und Lungenerkrankungen, Krebs und Diabetes mellitus betrachtet. Die Daten wurden deskriptiv und multivariat in logistischen Regressionen ausgewertet.

Ergebnisse
Von 2047 Teilnehmer:innen hatten 47,9 % mindestens eine Vorerkrankung. 21,4 % der Personen mit Vorerkrankungen hatten mindestens eine Versorgungsleistung ausgesetzt oder eine Terminabsage erhalten. 15,4 % gaben an, von sich aus auf einen Arztbesuch verzichtet zu haben. Fachärztliche Leistungen (Anteil 43,8 %) entfielen häufiger als hausärztliche (16,6 %). Nach Adjustierung für Alter, Geschlecht und Bildung erwiesen sich Lungen- (OR 1,80; p < 0,008) und Krebserkrankungen (OR 2,33; p < 0,001) als unabhängige Risikofaktoren für ärztliche Terminabsagen. 42,2 % der patient:innenseitigen Absagen erfolgten aus Angst vor einer Ansteckung mit SARS-CoV‑2.

Diskussion
Gesundheitspolitik und Medien stehen vor der Herausforderung, mit Ängsten in der Bevölkerung vor einer Infektion so umzugehen, dass notwendige Versorgungsleistungen dadurch nicht vermieden werden.
Acceptance and use of virtual reality games: an extension of HMSAM
Authors: Kari Tuomas , Kosa Mehmet 
Published: January 2023

AbstractVirtual reality (VR) is considered as one of the technological megatrends of 2020s, and today, VR systems are used in various settings, digital gaming being among the most popular ones. However, there has been a dearth of understanding regarding the central factors behind VR gaming acceptance and use. The present study therefore aimed to explain the factors that drive the use and acceptance of VR games. We extended the hedonic-motivation system acceptance model with utilitarian and inconvenience factors to capture the pertinent features of VR systems more holistically. We proposed a theoretical model and analyzed it through covariance-based structural equation modeling using an online survey sample of 473 VR gamers. Our findings help explain the role of different antecedents behind VR gaming acceptance and demonstrate that VR gaming is driven more by the hedonic gaming aspects than by the utilitarian health and well-being aspects of VR games, enjoyment being the strongest driver behind VR gaming intention and immersion. Moreover, findings also suggested that use intentions and immersion levels are not significantly diminished by physical discomfort and VR sickness. The findings, which potentially extend to other VR systems as well, also pose important implications for the providers of VR games. As the main contribution, based on our empirical findings, we provide a greater theoretical understanding on VR gaming acceptance and use.
Rank-adaptive dynamical low-rank integrators for first-order and second-order matrix differential equations
Authors: Hochbruck Marlis , Neher Markus , Schrammer Stefan 
Published: January 2023

AbstractDynamical low-rank integrators for matrix differential equations recently attracted a lot of attention and have proven to be very efficient in various applications. In this paper, we propose a novel strategy for choosing the rank of the projector-splitting integrator of Lubich and Oseledets adaptively. It is based on a combination of error estimators for the local time-discretization error and for the low-rank error with the aim to balance both. This ensures that the convergence of the underlying time integrator is preserved. The adaptive algorithm works for projector-splitting integrator methods for first-order matrix differential equations and also for dynamical low-rank integrators for second-order equations, which use the projector-splitting integrator method in its substeps. Numerical experiments illustrate the performance of the new integrators.
Do Co-Ethnic Neighbourhoods Affect the Labour Market Outcomes of Immigrants? Longitudinal Evidence from Australia
Authors: Nguyen Toan , Bernard Aude , Lee Rennie , Wilson Tom , Argent Neil 
Published: January 2023

Abstract
Unlike the situation in other immigrant-receiving countries, the impact of co-ethnic neighbourhoods on immigrants’ life outcomes has been understudied in Australia. In addition, because of reliance on cross-sectional and sample survey data, existing Australian studies have not taken advantage of recent methodological progress that addresses selection bias. In that context, this paper estimates the impact of the size of co-ethnic neighbourhoods on labour force participation, employment, hours worked and income of immigrants using microdata from the 2006–16 Australian Census Longitudinal Dataset that spans three censuses. Drawing on this unique dataset, the paper applies a series of OLS regression models that address issues of individual and location sorting by applying individual-fixed effects, controlling for residential mobility, duration of residence and using an exogenous measure of co-ethnic neighbourhood size. We find a small significant negative effect on labour participation and wage, particularly for the non-tertiary educated and immigrants with low English proficiency. However, when we control for residential mobility, residence in co-ethnic neighbourhoods is no longer statistically significant, which highlights the importance of stringent methodological choices that control for settlement trajectories, while revealing that movement toward smaller co-ethnic neighbourhoods is associated with increased labour force participation. Our findings suggest that efforts by the Australian government to settle immigrants in regional areas with a limited migrant population should not affect the labour market outcomes of immigrants given that ethnic enclaves do not facilitate labour market integration in Australia.
Sustainable soil management measures: a synthesis of stakeholder recommendations
Authors: Strauss Veronika , Paul Carsten , Dönmez Cenk , Löbmann Michael , Helming Katharina 
Published: February 2023

AbstractSoil degradation threatens agricultural production and soil multifunctionality. Efforts for private and public governance are increasingly emerging to leverage sustainable soil management. They require consensus across science, policy, and practice about what sustainable soil management entails. Such agreement does not yet exist to a sufficient extent in agronomic terms; what is lacking is a concise list of soil management measures that enjoy broad support among all stakeholders, and evidence on the question what hampers their implementation by farmers. We therefore screened stakeholder documents from public governance institutions, nongovernmental organizations, the agricultural industry, and conventional and organic farmer associations for recommendations related to agricultural soil management in Germany. Out of 46 recommended measures in total, we compiled a shortlist of the seven most consensual ones: (1) structural landscape elements, (2) organic fertilization, (3) diversified crop rotation, (4) permanent soil cover, (5) conservation tillage, (6) reduced soil loads, and (7) optimized timing of wheeling. Together, these measures support all agricultural soil functions, and address all major soil threats except soil contamination. Implementation barriers were identified with the aid of an online survey among farmers (n = 78). Results showed that a vast majority of farmers (> 80%) approved of all measures. Barriers were mostly considered to be economic and in some cases technological, while missing knowledge or other factors were less relevant. Barriers were stronger for those measures that cannot be implemented in isolation, but require a systemic diversification of the production system. This is especially the case for measures that are simultaneously beneficial to many soil functions (measures 2, 3, and 4). Results confirm the need for a diversification of the agricultural system in order to meet challenges of food security and climate change. The shortlist presents the first integrative compilation of sustainable soil management measures supporting the design of effective public or private governance.
Iridescent Beetle Adornments Suggest Incipient Status Competition among the Earliest Horticulturalists in Bears Ears National Monument
Authors: Terlep Michael L. , Smiley Francis E. , Haas Randall 
Published: February 2023

AbstractAnthropological research has long theorized that emergent food-producing economies catalyzed high levels of inequality in human societies, as evident in the earliest use of jewelry made from gold, copper, and other precious minerals among early agricultural populations. Although the US Southwest appears to have been an exception, we report the discovery of two Basketmaker II period necklaces constructed of green iridescent scarab beetle femora, which suggests a homologous association between emergent agriculture and inequality. Drawing insight from ethnography, archaeology, entomology, and evolutionary ecology, we hypothesize that these and other jewelry items of Basketmaker II culture were visually prominent, honest signals of socioeconomic capital that emerged during a period of surplus food production and incipient wealth accumulation. It appears that Basketmaker II societies—like other emergent food-producing economies around the world—grappled with the opportunities and challenges that arise with surplus production, albeit in a distinct way that involved visually striking insect and feather adornments as status signals. Archaeologists may have previously overlooked this behavior due to Western biases that privilege precious metals and minerals as prestige objects and archaeological biases that tend to view insects as food or agents of site disturbance.
“May We Not Write Our Own Fairy Tales and Make Black Beautiful?” African American Teachers, Children's Literature, and the Construction of Race in the Curriculum, 1920–1945
Authors: Nocera Amato 
Published: February 2023

AbstractThis article examines children's literature written by African American teachers during the first part of the twentieth century. Drawing on theories of racialization, I analyze children's books written by two African American teachers: Helen Adele Whiting (1885-1959) and Jane Dabney Shackelford (1895-1979). I argue that their books represented more than an effort toward greater Black representation in schools; they also served as a contribution to a larger discourse on Blackness and identity that emerged during the “New Negro” movement. In this view, African American teachers were not mere passive recipients of an outside Black culture, but rather intellectual actors involved in the production of racial identity during the interwar period.
PRIVATIZATION OF AGER IN AFRICA FROM 123 TO 63 b.c.
Authors: Kim Yeong-Chei 
Published: January 2023

AbstractScholars have generally underestimated the level of Roman involvement in Africa in the period between the annexation of Carthage in 146 b.c. and Caesar's victory at Thapsus in 46 b.c., and the land in Africa which the Romans annexed has been conventionally called public land (ager publicus). This paper analyses the surviving text of the African provisions of the epigraphic lex agraria of 111 b.c. and notes that the term ager publicus is not attested in the provincial section of the law. The land in Africa appears simply as ager in Africa and the term ager publicus is confined exclusively to Italy in the law of 111. However, Cicero's references to Rullus’ agrarian proposal in 64/3 b.c. in the De lege agraria suggest that the term ager publicus was used to qualify land existing outside Italy in Rullus’ proposal. This paper argues that the concept of ager publicus as opposed to private land developed in Africa between 111 and 63 b.c., and that this was linked to privatization of ager in Africa in this period. The results of this study suggest a high degree of Roman exploitation of African land prior to the Caesarean and Augustan colonies in the 40s b.c.
Taking Over the Size Effect: Asset Pricing Implications of Merger Activity
Authors: Easterwood Sara , Netter Jeffry , Paye Bradley , Stegemoller Michael 
Published: January 2023

AbstractWe show that merger announcement returns account for virtually all of the measured size premium. An empirical proxy for ex ante takeover exposure positively and robustly relates to cross-sectional expected returns. The relation between size and expected returns becomes positive or insignificant, rather than negative, conditional on this takeover characteristic. Asset pricing models that include a factor based on the takeover characteristic outperform otherwise similar models that include the conventional size factor. We conclude that the takeover factor should replace the conventional size factor in benchmark asset pricing models.
Threats to state survival as emergencies in international law
Authors: Dill Janina 
Published: January 2023

AbstractDoes international law restrict the use of force by states in self-defense even when their survival is threatened? Should it? To answer these questions, I compare international law to domestic law and develop two ideal-types of emergency: in a ‘subject emergency’ law imposes absolute, justiciable limits on self-defense. In a ‘community emergency’ the sovereign, not law, determines what is necessary for the survival of the community and its legal system: sustaining the rule of law justifies its temporary retreat. I show that international law has elements of both ideal-types. It imposes some absolute limits on self-defense. However, international law also retreats, allowing the victim state to determine the (1) aims, (2)ad bellumproportionality, and (3) end of self-defense, as if armed threats triggered community emergencies. These three retreats serve the function of sustaining the rule of international law over the states at war. Retreats (1) and (3) also help sustain the rule of international law over the international community. That international law does and shouldnottreat armed threats against states simply as subject emergencies, shows it can only sustain the rule of international law in an emergency by retreating. This is a negative litmus test for international law's ability to diffuse anarchy in International Relations.
Measurement Invariance of Children’s SEL Competencies
Authors: Anthony Christopher J. , Lei Pui-Wa , Elliott Stephen N. , DiPerna James C. , Cefai Carmel , Bartolo Paul A. , Camilleri Liberato , O’Riordan Mollie , Grazzani Ilaria , Cavioni Valeria , Conte Elisabetta , Ornaghi Veronica , Tatalović Vorkapić Sanja , Poulou Maria , Martinsone Baiba , Simões Celeste , Colomeischi Aurora A. 
Published: January 2023

Abstract: Although children use social and emotional learning skills (SEL) across the world, the expression of these skills may vary across cultures and developmental levels. Such variability complicates the process of assessing SEL competencies with consequences for understanding differences in SEL skills and developing interventions. To address these challenges, the current study examined the measurement invariance of translated versions of a brief, multi-informant (Teacher, Parent, Student) measure of SEL skills developed in the US with data from six European countries (Croatia, Greece, Italy, Latvia, Portugal, and Romania; n = 10,602; 8,520; 6,611, for the SSIS SEL b – Teacher, Parent, and Student versions, respectively). In addition to cross-country invariance testing, we conducted measurement invariance testing across ages (Primary and Secondary students) for the Teacher and Student forms of the measure. Results revealed a high degree of measurement invariance across countries (Scalar for the Teacher form and Partial Scalar for the Parent and Student form) and developmental levels (Scalar for the Teacher form and Partial Scalar for the Student form), supporting the use of translated versions of the SSIS SEL b for international research across these countries and developmental levels. Implications are discussed for assessment and promoting children’s SEL competencies globally.
Three‐Dimensional Broadband Interferometric Mapping and Polarization (BIMAP‐3D) Observations of Lightning Discharge Processes
Authors: Shao Xuan‐Min , Jensen Daniel , Ho Cheng , Graham Paul , Haynes William , Caffrey Michael , Raby Eric , Meierbachtol Collin , Hemsing David , Sonnenfeld Richard 
Published: January 2023

AbstractFollowing on our earlier single‐station, 2‐dimensional (2D) broadband interferometric mapping and polarization (BIMAP) observations of lightning discharges, we recently deployed two BIMAP stations at Los Alamos National Laboratory to map the lightning sources and their polarization in full 3‐dimensional (3D) space (BIMAP‐3D). The two stations are separated by 11.5‐km and each station consists of four antenna sets (instead of three for the original BIMAP) that form a Y‐shaped array for improved interferometric performance. In this paper, we report the BIMAP‐3D system design, a generalized and analytical 2D interferometry technique for noncoplanar antenna array, a two‐stage 3D mapping technique based on geometric triangulation and baseline‐based differential time of arrival, and a technique to reconstruct the polarization orientation in 3D space by combining the 2D polarization results from the two‐station observations. Along with description of the techniques, we demonstrate and discuss the initial lightning results, including 3D maps for a hybrid intracloud and cloud‐to‐ground flash and for a normal intracloud flash, development of abnormal K‐change leaders, and polarization signatures for a K‐change leader. We find that with the two‐stage 3D mapping techniques, the sources can be located to meters accuracy for a favorable event that occurs between the two stations. We also find the polarization vectors for the example K leader are mostly orthogonal to the leader channel after the full 3D polarization analysis. The main purpose of this paper is to report the BIMAP‐3D techniques and capabilities. Detailed analysis of more specific discharge processes will be reported in later studies.