bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enzyme-induced mineralization of hydrogels with amorphous calcium carbonate for fast synthesis of ultrastiff, strong and tough organic–inorganic double networks
Authors: Milovanovic Marko , Mihailowitsch Lydia , Santhirasegaran Mathusiha , Brandt Volker , Tiller Joerg C. 
Published: June 2021

Abstract
Hydrogels with good mechanical properties have great importance in biological and medical applications. Double-network (DN) hydrogels were found to be very tough materials. If one of the two network phases is an inorganic material, the DN hydrogels also become very stiff without losing their toughness. So far, the only example of such an organic–inorganic DN hydrogel is based on calcium phosphate, which takes about a week to be formed as an amorphous inorganic phase by enzyme-induced mineralization. An alternative organic–inorganic DN hydrogel, based on amorphous CaCO3, which can be formed as inorganic phase within hours, was designed in this study. The precipitation of CaCO3 within a hydrogel was induced by urease and a urea/CaCl2 calcification medium. The amorphous character of the CaCO3 was retained by using the previously reported crystallization inhibiting effects of N-(phosphonomethyl)glycine (PMGly). The connection between organic and inorganic phases via reversible bonds was realized by the introduction of ionic groups. The best results were obtained by copolymerization of acrylamide (AAm) and sodium acrylate (SA), which led to water-swollen organic–inorganic DN hydrogels with a high Young’s modulus (455 ± 80 MPa), remarkable tensile strength (3.4 ± 0.7 MPa) and fracture toughness (1.1 ± 0.2 kJ m−2).

Graphical Abstract
The present manuscript describes the method of enzymatic mineralization of hydrogels for the production of ultrastiff and strong composite hydrogels. By forming a double-network structure based on an organic and an inorganic phase, it is possible to improve the mechanical properties of a hydrogel, such as stiffness and strength, by several orders of magnitude. The key to this is the formation of a percolating, amorphous inorganic phase, which is achieved by inhibiting crystallization of precipitated amorphous CaCO3 with N-(phosphonomethyl)glycine and controlling the nanostructure with co polymerized sodium acrylate. This creates ultrastiff, strong and tough organic–inorganic double-network hydrogels.
Risky Gambling Behaviors: Associations with Mental Health and a History of Adverse Childhood Experiences (ACEs)
Authors: Bristow Lindsay A. , Afifi Tracie O. , Salmon Samantha , Katz Laurence Y. 
Published: June 2021

AbstractProblem gambling and adverse childhood experiences (ACEs) are highly co-morbid and lead to numerous adverse health outcomes. Research demonstrates that greater levels of well-being protect individuals from experiencing ACE-related harms after a history of childhood adversity; however, this relationship has not been examined in the gambling literature. We hypothesized that individuals who experienced ACEs would engage in more problem gambling behaviors. We also hypothesized that individuals who experienced ACEs and reported flourishing mental health would have lower rates of problem gambling than individuals who experienced ACEs but did not report flourishing mental health. We conducted a secondary data analysis of the adult sample in the Well-Being and Experiences (WE) Study. Examining a parent population, parents and caregivers (N = 1000; Mage = 45.2 years; 86.5% female) of adolescents were interviewed on a variety of measures, including their history of ACEs, their gambling behaviors within the past year, and their mental health and well-being. We used multinomial logistic regression analysis to examine the relationship between 15 ACEs and gambling type (i.e., non-gambler, non-problem gambler, at-risk/problem gambler). We used interaction terms between each ACE and mental health to examine the moderating role of flourishing mental health and well-being. ACEs were associated with at-risk/problem gambling supporting hypothesis 1. Contrary to hypothesis 2, overall, flourishing mental health did not moderate the relationship between ACEs and gambling severity except for one ACE. In this study, we were able to gain a better understanding of how different ACEs each contribute to varying levels of gambling severity.
Amazonia as the Origin and Diversification Area of Didelphidae (Mammalia: Metatheria), and a Review of the Fossil Record of the Clade
Authors: Castro Mariela C. , Dahur Murilo J. , Ferreira Gabriel S. 
Published: June 2021

AbstractDidelphidae is the largest New World radiation of marsupials, and is mostly represented by arboreal, small- to medium-sized taxa that inhabit tropical and/or subtropical forests. The group originated and remained isolated in South America for millions of years, until the formation of the Isthmus of Panama. In this study, we present the first reconstruction of the biogeographic history of Didelphidae including all major clades, based on parametric models and stratified analyses over time. We also compiled all the pre-Quaternary fossil records of the group, and contrasted these data to our biogeographic inferences, as well as to major environmental events that occurred in the South American Cenozoic. Our results indicate the relevance of Amazonia in the early diversification of Didelphidae, including the divergence of the major clades traditionally ranked as subfamilies and tribes. Cladogeneses in other areas started in the late Miocene, an interval of intense shifts, especially in the northern portion of Andes and Amazon Basin. Occupation of other areas continued through the Pliocene, but few were only colonized in Quaternary times. The comparison between the biogeographic inference and the fossil records highlights some further steps towards better understanding the spatiotemporal evolution of the clade. Finally, our results stress that the early history of didelphids is obscured by the lack of Paleogene fossils, which are still to be unearthed from low-latitude deposits of South America.
Circular quiver gauge theories, isomonodromic deformations and $$W_N$$ fermions on the torus
Authors: Bonelli Giulio , Del Monte Fabrizio , Gavrylenko Pavlo , Tanzini Alessandro 
Published: June 2021

AbstractWe study the relation between class $$\mathcal {S}$$
S
theories on punctured tori and isomonodromic deformations of flat SL(N) connections on the two-dimensional torus with punctures. Turning on the self-dual $$\Omega $$
Ω
-background corresponds to a deautonomization of the Seiberg–Witten integrable system which implies a specific time dependence in its Hamiltonians. We show that the corresponding $$\tau $$
τ
-function is proportional to the dual gauge theory partition function, the proportionality factor being a nontrivial function of the solution of the deautonomized Seiberg–Witten integrable system. This is obtained by mapping the isomonodromic deformation problem to $$W_N$$

W
N

free fermion correlators on the torus.
Commuting to the future: Assessing the relationship between individuals’ usage of information and communications technology, personal attitudes, characteristics and mode choice
Authors: van Lierop Dea , Bahamonde-Birke Francisco J. 
Published: June 2021

AbstractInnovations in transportation and communications technologies influence the development of cities and how people move through them. Since the widespread adoption of smartphones, mobility and information and communication technology (ICT) have become increasingly interconnected, and there may be a possibility for mobile technologies to nudge, or influence, individuals to travel using sustainable, and collective modes. It remains unclear whether social, financial, or ICT incentives would be effective to nudge the use of sustainable modes. The objective of the study is to understand the reasons affecting modal choices and how the use of ICTs and personal opinions and attitudes influence the decision-making process. A discrete choice model is used to consider five transportation alternatives including three single modes, namely bicycle, transit, and car, and two multimodal possibilities, bicycle and transit as well as park and ride (car and transit). The target population for this study are Utrecht University employees, who travel to a large university campus located in Utrecht, the Netherlands. The results of the person-based mode-choice model demonstrate that strong correlations exist between the kinds of mobile applications individuals use, their attitudes towards travel, their personal characteristics and their transportation mode. No mobile application seems to favor the use of active modes, which cast doubts upon the use of ICT to promote sustainable transportation. However, social incentives may play an important role for certain groups as individuals who are influenced by their friends, family, and colleagues, are less likely to travel by car or to use park & ride facilities.
Continuation analysis of a nonlinear rotor system
Authors: Akay Mehmet Selim , Shaw Alexander D. , Friswell Michael I. 
Published: June 2021

AbstractNonlinearities in rotating systems have been seen to cause a wide variety of rich phenomena; however, the understanding of these phenomena has been limited because numerical approaches typically rely on “brute force” time simulation, which is slow due to issues of step size and settling time, cannot locate unstable solution families, and may miss key responses if the correct initial conditions are not used. This work uses numerical continuation to explore the responses of such systems in a more systematic way. A simple isotropic rotor system with a smooth nonlinearity is studied, and the rotating frame is used to obtain periodic solutions. Asynchronous responses with oscillating amplitude are seen to initiate at certain drive speeds due to internal resonance, in a manner similar to that observed for nonsmooth rotor–stator contact systems in the previous literature. These responses are isolated, in the sense that they will only meet the more trivial synchronous responses in the limit of zero damping and out of balance forcing. In addition to increasing our understanding of the responses of these systems, the work establishes the potential of numerical continuation as a tool to systematically explore the responses of nonlinear rotor systems.
A matrix-less method to approximate the spectrum and the spectral function of Toeplitz matrices with real eigenvalues
Authors: Ekström Sven-Erik , Vassalos Paris 
Published: June 2021

AbstractIt is known that the generating function f of a sequence of Toeplitz matrices {Tn(f)}n may not describe the asymptotic distribution of the eigenvalues of Tn(f) if f is not real. In this paper, we assume as a working hypothesis that, if the eigenvalues of Tn(f) are real for all n, then they admit an asymptotic expansion of the same type as considered in previous works, where the first function, called the eigenvalue symbol $\mathfrak {f}$
f
, appearing in this expansion is real and describes the asymptotic distribution of the eigenvalues of Tn(f). This eigenvalue symbol $\mathfrak {f}$
f
is in general not known in closed form. After validating this working hypothesis through a number of numerical experiments, we propose a matrix-less algorithm in order to approximate the eigenvalue distribution function $\mathfrak {f}$
f
. The proposed algorithm, which opposed to previous versions, does not need any information about neither f nor $\mathfrak {f}$
f
is tested on a wide range of numerical examples; in some cases, we are even able to find the analytical expression of $\mathfrak {f}$
f
. Future research directions are outlined at the end of the paper.
The use of QCA in science, technology and innovation studies: a review of the literature and an empirical application to knowledge transfer
Authors: Fernández-Esquinas Manuel , Sánchez-Rodríguez María Isabel , Pedraza-Rodríguez José Antonio , Muñoz-Benito Rocío 
Published: June 2021

AbstractThis article analyses the use of qualitative comparative analysis (QCA) in social studies on science, technology and innovation. The goals are to address how and why the method is used, and to explore the advantages and shortcomings for this research area. A review of the literature and practical application are combined. Firstly, the article finds that the acceptance of QCA is unevenly distributed in the major research fields related to knowledge production. It is used mainly to study innovation in firms but is largely absent in science and technology studies. Second, an original study on university–industry links provides a strategic site that displays how research unfolds. Its findings demonstrate the combinations of factors that shape knowledge transfer and the configurational nature of the process. The article offers an account of challenges and directions for future research and discusses the possibilities of the method as a third way between qualitative and quantitative traditions in science, technology and innovation.
The effect of web of science subject categories on clustering: the case of data-driven methods in business and economic sciences
Authors: Jesenko Berndt , Schlögl Christian 
Published: June 2021

AbstractThe primary goal of this article is to identify the research fronts on the application of data-driven methods in business and economics. For this purpose, the research literature of the business and economic sciences Subject Categories from the Web of Science is mapped using BibExcel and VOSviewer. Since the assignment to subject categories is done at the journal level and since a journal is often assigned to several subject categories in Web of Science, two mappings are performed: one without considering multiple assignments (broad view) and one considering only those (articles from) journals that have been assigned exclusively to the business and economic sciences subject categories and no others (narrow view). A further aim of this article is therefore to identify differences in the two mappings. Surprisingly, engineering sciences play a major role in the broad mapping, in addition to the economic sciences. In the narrow mapping, however, only the following clusters with a clear business-management focus emerge: (i) Data-driven methods in management in general and data-driven supply chain management in particular, (ii) Data-driven operations research analyses with different business administration/management focuses, (iii) Data-driven methods and processes in economics and finance, and (iv) Data-driven methods in Information Systems. One limitation of the narrow mapping is that many relevant documents are not covered since the journals in which they appear are assigned to multiple subject categories in WoS. The paper comes to the conclusion that the multiple assignments of subject categories in Web of Science may lead to massive changes in the results. Adjacent subject areas—in this specific case the application of data-driven methods in engineering and more mathematically oriented contributions in economics (econometrics) are considered in the broad mapping (not excluding subject categories from neighbouring disciplines) and are even over-represented compared to the core areas of business and economics. If a mapping should only consider the core aspects of particular research fields, it is shown in this use case that the exclusion of Web of Science-subject categories that do not belong to the core areas due to multiple assignments (narrow view), may be a valuable alternative. Finally, it depends on the reader to decide which mapping is more beneficial to them.
Measuring academic entities’ impact by content-based citation analysis in a heterogeneous academic network
Authors: Zhang Fang , Wu Shengli 
Published: June 2021

AbstractEvaluating the impact of papers, researchers and venues objectively is of great significance to academia and beyond. This may help researchers, research organizations, and government agencies in various ways, such as helping researchers find valuable papers and authoritative venues and helping research organizations identify good researchers. A few studies find that rather than treating citations equally, differentiating them is a promising way for impact evaluation of academic entities. However, most of those methods are metadata-based only and do not consider contents of cited and citing papers; while a few content-based methods are not sophisticated, and further improvement is possible. In this paper, we study the citation relationships between entities by content-based approaches. Especially, an ensemble learning method is used to classify citations into different strength types, and a word-embedding based method is used to estimate topical similarity of the citing and cited papers. A heterogeneous network is constructed with the weighted citation links and several other features. Based on the heterogeneous network that consists of three types of entities, we apply an iterative PageRank-like method to rank the impact of papers, authors and venues at the same time through mutual reinforcement. Experiments are conducted on an ACL dataset, and the results demonstrate that our method greatly outperforms state-of-the art competitors in improving ranking effectiveness of papers, authors and venues, as well as in being robust against malicious manipulation of citations.
Mapping the field of psychology: Trends in research topics 1995–2015
Authors: Wieczorek Oliver , Unger Saïd , Riebling Jan , Erhard Lukas , Koß Christian , Heiberger Raphael 
Published: June 2021

AbstractWe map the topic structure of psychology utilizing a sample of over 500,000 abstracts of research articles and conference proceedings spanning two decades (1995–2015). To do so, we apply structural topic models to examine three research questions: (i) What are the discipline’s most prevalent research topics? (ii) How did the scientific discourse in psychology change over the last decades, especially since the advent of neurosciences? (iii) And was this change carried by high impact (HI) or less prestigious journals? Our results reveal that topics related to natural sciences are trending, while their ’counterparts’ leaning to humanities are declining in popularity. Those trends are even more pronounced in the leading outlets of the field. Furthermore, our findings indicate a continued interest in methodological topics accompanied by the ascent of neurosciences and related methods and technologies (e.g. fMRI’s). At the same time, other established approaches (e.g. psychoanalysis) become less popular and indicate a relative decline of topics related to the social sciences and the humanities.
Stichwort: Implementationsforschung zwischen Intervention und Transfer im Kontext von Mehrsprachigkeit und sprachlicher Bildung
Authors: Roth Hans-Joachim , Uçan Yasemin , Sieger Sonja , Gollan Christina 
Published: June 2021

ZusammenfassungIm vorliegenden Beitrag wird ausgehend von der Unterscheidung in einen weiten und einen engen Implementationsbegriff nach Schrader et al. (2020) ein Überblick über den Stand der Implementationsforschung zu sprachlicher Bildung mit einem Schwerpunkt auf Mehrsprachigkeit gegeben. Dafür wird zunächst eine Systematik zum Verständnis von Implementationsforschung vorgelegt, an die sich eine Darstellung der zwei großen bundesweiten Programme im Feld der sprachlichen Bildung in Deutschland – FörMig und BiSS – anschließt, um den Entwicklungsprozess der Forschung zu Implementation von sprachlichen Bildungsmaßnahmen nachzuzeichnen. Im Anschluss werden weitere aktuelle Studien zur Sprachbildung und -förderung im Elementarbereich gesichtet und – als exemplarischer Blick auf die internationale Forschung zur Implementation mehrsprachiger Bildung – Ergebnisse zum Ansatz des Translanguaging präsentiert. Der Beitrag schließt mit einer Standortbestimmung der aktuellen Implementationsforschung zu sprachlicher Bildung und Mehrsprachigkeit anhand von zusammenfassenden Thesen zu Anlage und Gelingensbedingungen von Implementation in der sprachlichen Bildung.
Application of pre-stack seismic waveform inversion and empirical relationships for the estimation of geomechanical properties in Ruby field, central swamp depobelt, Onshore Niger Delta, Nigeria
Authors: Ugbor Charles Chibueze , Odong Peter Ogobi , Akpan Aniefiok Sylvester 
Published: June 2021

AbstractPre-stack seismic inversion, well log analysis approach and empirical relations were adopted in this study to better estimate geomechanical properties of Ruby field with minimum error. The use of conventional well log empirical method alone to evaluate geomechanical properties in oil/gas fields sometimes becomes problematic. Geomechanical properties were divided into: elastic moduli [Young’s modulus, shear modulus, bulk modulus and Poisson ratio (PR)] and rock mechanical strength properties (closure stress ratio (CSR), brittleness (BRI) and compressibility). Four geomechanical earth models (CSR, BRI, Young’s modulus and PR) were generated from the inversion analysis to understand the distribution of rock strength properties across the field. The results deciphered high Young’s, shear and bulk modulus in the reservoir zone compared to the cap/seal rocks and a decrease in PR. This implies that, the cap/seal are more ductile and less compressible than the reservoir rocks, indicating that the reservoirs are highly brittle. CSR result reveals high in cap/seal indicating that the cap/seal rock are harder to fracture and has a greater chance to withstand higher compressive stress before failing as opposed to reservoir rocks. The inverted earth model shows that, Young’s modulus and brittleness increase toward the northeastern part of the field, while CSR and PR increase toward the southwestern part of the field. These results suggest that harder, stiffer, highly compressible and easily fractured rocks are found in the northern and eastern part of the field as opposed to the southern to western part of the field that is ductile.
Practitioner’s review: medication for children and adolescents with autism spectrum disorder (ASD) and comorbid conditions
Authors: Popow Christian , Ohmann Susanne , Plener Paul 
Published: June 2021

AbstractAlleviating the multiple problems of children with autism spectrum disorder (ASD) and its comorbid conditions presents major challenges for the affected children, parents, and therapists. Because of a complex psychopathology, structured therapy and parent training are not always sufficient, especially for those patients with intellectual disability (ID) and multiple comorbidities. Moreover, structured therapy is not available for a large number of patients, and pharmacological support is often needed, especially in those children with additional attention deficit/hyperactivity and oppositional defiant, conduct, and sleep disorders.