bluuebunny/crossref_metadata_2025_split huggingface dataset:
Where the Solar system meets the solar neighbourhood: patterns in the distribution of radiants of observed hyperbolic minor bodies
Authors: de la Fuente Marcos Carlos , de la Fuente Marcos Raúl , Aarseth Sverre J 
Published: February 2018

Abstract
Observed hyperbolic minor bodies might have an interstellar origin, but they can be natives of the Solar system as well. Fly-bys with the known planets or the Sun may result in the hyperbolic ejection of an originally bound minor body; in addition, members of the Oort cloud could be forced to follow inbound hyperbolic paths as a result of secular perturbations induced by the Galactic disc or, less frequently, due to impulsive interactions with passing stars. These four processes must leave distinctive signatures in the distribution of radiants of observed hyperbolic objects, both in terms of coordinates and velocity. Here, we perform a systematic numerical exploration of the past orbital evolution of known hyperbolic minor bodies using a full N-body approach and statistical analyses to study their radiants. Our results confirm the theoretical expectations that strong anisotropies are present in the data. We also identify a statistically significant overdensity of high-speed radiants towards the constellation of Gemini that could be due to the closest and most recent known fly-by of a star to the Solar system, that of the so-called Scholz's star. In addition to and besides 1I/2017 U1 (‘Oumuamua), we single out eight candidate interstellar comets based on their radiants’ velocities.
An Isotopic Anthropology of Ancient Maya Diets
Authors: White Christine D. 
Published: February 2018

AbstractThe ancient Maya are known to have relied heavily on maize horticulture. In spite of the fact that maize was responsible for both the ideological and physical survival of the Maya, there was significant variability in the degree to which it was consumed. In this chapter, direct evidence of food consumption provided by the stable isotope composition of carbon and nitrogen is reviewed in terms of variability that existed across time, space, and social variables. Relationships between diet and significant temporal developments such as agricultural intensification, the collapse of Classic Maya society, and the Spanish conquest are examined, along with the use of diet to reconstruct political economies, gender, and status differentiation.
A habitus divided? The effects of social mobility on the habitus and consumption
Authors: Paulson Erika L. 
Published: February 2018

Purpose
The purpose of this study is to examine social mobility. Social mobility has traditionally been thought to result in a divided habitus. However, recent work has suggested that for the socially mobile, habitus may become blended or even that individuals can choose their habitus in a strategic fashion. Each position has received empirical support, raising two questions. First, does the experience of social mobility result in a habitus that is more divided or strategic? Second, what factors affect this outcome?

Design/methodology/approach
These questions are investigated by conducting depth interviews with people who have experienced social mobility.

Findings
The direction of social mobility determines what effect social mobility has on the habitus. For the downwardly mobile, the habitus appears to remain rooted in one’s former class. This is because downward movement is devalued, and so there is less incentive for those who experience it to change their thoughts, feelings or behaviors to match their new position. For the upwardly mobile, the habitus changes slowly. The trajectory and the subjective experience also affect the outcome. Two strategies respondents use to deal with social mobility are noted.

Research limitations/implications
Bourdieu’s notion of the divided habitus is reconsidered and compared to newer incarnations, and the importance of the direction of social mobility is underlined. This work explains why upward and downward mobility result in different changes in the habitus.

Practical implications
Investigating the experience of social mobility is particularly important given the frequent, dynamic nature of mobility in European countries. Two strategies used to manage downward mobility are identified.

Originality/value
This work reconsiders Bourdieu’s notion of the divided habitus and newer incarnations and explains why upward and downward mobility result in different changes in the habitus. Such a finding is not only an invitation to expand on the notion of habitus but also works to draw attention to other factors that play a role in habitus and strategies used to manage change.
An investigation of the neural correlates of purchase behavior through fNIRS
Authors: Çakir Murat Perit , Çakar Tuna , Girisken Yener , Yurdakul Dicle 
Published: February 2018

Purpose
This study aims to explore the plausibility of the functional near-infrared spectroscopy (fNIRS) methodology for neuromarketing applications and develop a neurophysiologically-informed model of purchasing behavior based on fNIRS measurements.

Design/methodology/approach
The oxygenation signals extracted from the purchase trials of each subject were temporally averaged to obtain average signals for buy and pass decisions. The obtained data were analyzed via both linear mixed models for each of the 16 optodes to explore their separate role in the purchasing decision process and a discriminant analysis to construct a classifier for buy/pass decisions based on oxygenation measures from multiple optodes.

Findings
Positive purchasing decisions significantly increase the neural activity through fronto-polar regions, which are closely related to OFC and vmPFC that modulate the computation of subjective values. The results showed that neural activations can be used to decode the buy or pass decisions with 85 per cent accuracy provided that sensitivity to the budget constraint is provided as an additional factor.

Research limitations/implications
The study shows that the fNIRS measures can provide useful biomarkers for improving the classification accuracy of purchasing tendencies and might be used as a main or complementary method together with traditional research methods in marketing. Future studies might focus on real-time purchasing processes in a more ecologically valid setting such as shopping in supermarkets.

Originality/value
This paper uses an emerging neuroimaging method in consumer neuroscience, namely, fNIRS. The decoding accuracy of the model is 85 per cent which presents an improvement over the accuracy levels reported in previous studies. The research also contributes to existing knowledge by providing insights in understanding individual differences and heterogeneity in consumer behavior through neural activities.
Understanding psychological contract violation and its consequences on mobile shopping applications use in a developing country context
Authors: Chopdar Prasanta Kr. , Sivakumar V.J. 
Published: February 2018

Purpose
The purpose of this research is to investigate the influence of psychological contract violation (PCV) on service quality and perceived value, and consequently on users positive word of mouth intention towards mobile shopping applications. The role of personalization as a moderator is further investigated.

Design/methodology/approach
A descriptive research approach was adopted, and responses were gathered from 252 mobile shopping application users in India, using an online survey. The variance-based partial least square structural equation modelling approach was opted for analysing the research model.

Findings
The results showed the deleterious effects of PCV on service quality and perceived value. The findings further confirm the significant positive impact of service quality and perceived value on the positive word of mouth intention of users. The role of personalization in mitigating the adverse effects of PCV on perceived value among users of mobile shopping application is highlighted in the study; however, its role in safeguarding service quality is found to be insignificant.

Research limitations/implications
A study with larger sample of respondents from varied nationalities will aid in generalizing the findings of this research.

Originality/value
This is the first time that PCV and its consequences have been studied in the context of mobile shopping applications.
Self-leadership and self-control strength in the work context
Authors: Müller Teresa , Niessen Cornelia 
Published: February 2018

Purpose
Based on the limited strength model, the purpose of this paper is to examine the relationship of self-leadership strategies (behavior-focused strategies, constructive thought patterns) and qualitative and quantitative overload with subsequent self-control strength.

Design/methodology/approach
The present study is a field study with 142 university affiliates and two measurement occasions during a typical workday (before and after lunch). Self-control strength was measured using a handgrip task.

Findings
Hierarchical regression analyses revealed that self-leadership, quantitative overload, and qualitative overload were not directly associated with self-control strength at either of the two measurement occasions. Qualitative overload moderated the relationship between self-leadership and self-control strength, such that self-leadership was associated with lower self-control strength at both measurement occasions when individuals experienced high qualitative overload in the morning.

Practical implications
Employees and employers should be aware of the possibly depleting characteristics of self-leadership in order to be able to create a work environment allowing for the recovery and replenishment of self-control strength.

Originality/value
The present field study theoretically and methodologically contributes to the literature on self-leadership and self-control strength in the work context by investigating the depleting nature of self-leadership and workload.
Collaborative matrix factorization mechanism for group recommendation in big data-based library systems
Authors: Liu Yezheng , Yang Lu , Sun Jianshan , Jiang Yuanchun , Wang Jinkun 
Published: February 2018

Purpose
Academic groups are designed specifically for researchers. A group recommendation procedure is essential to support scholars’ research-based social activities. However, group recommendation methods are rarely applied in online libraries and they often suffer from scalability problem in big data context. The purpose of this paper is to facilitate academic group activities in big data-based library systems by recommending satisfying articles for academic groups.

Design/methodology/approach
The authors propose a collaborative matrix factorization (CoMF) mechanism and implement paralleled CoMF under Hadoop framework. Its rationale is collaboratively decomposing researcher-article interaction matrix and group-article interaction matrix. Furthermore, three extended models of CoMF are proposed.

Findings
Empirical studies on CiteULike data set demonstrate that CoMF and three variants outperform baseline algorithms in terms of accuracy and robustness. The scalability evaluation of paralleled CoMF shows its potential value in scholarly big data environment.

Research limitations/implications
The proposed methods fill the gap of group-article recommendation in online libraries domain. The proposed methods have enriched the group recommendation methods by considering the interaction effects between groups and members. The proposed methods are the first attempt to implement group recommendation methods in big data contexts.

Practical implications
The proposed methods can improve group activity effectiveness and information shareability in academic groups, which are beneficial to membership retention and enhance the service quality of online library systems. Furthermore, the proposed methods are applicable to big data contexts and make library system services more efficient.

Social implications
The proposed methods have potential value to improve scientific collaboration and research innovation.

Originality/value
The proposed CoMF method is a novel group recommendation method based on the collaboratively decomposition of researcher-article matrix and group-article matrix. The process indirectly reflects the interaction between groups and members, which accords with actual library environments and provides an interpretable recommendation result.
Comparing the determinants of non-MOOC and MOOC continuance intention in Taiwan
Authors: Chen Chia-Chen , Lee Chun-Hsiung , Hsiao Kuo-Lun 
Published: February 2018

Purpose
Massive open online courses (MOOCs) differ from non-MOOC e-learning platforms mainly in terms of degree of openness, with MOOCs designed to maximize learner access and interaction. The purpose of this paper is to propose a new research model to explore intention to continue to use MOOCs from the perspectives of openness and interactivity, based on related theories and dimensions from previous research.

Design/methodology/approach
In order to evaluate the effectiveness of the MOOC platform, two online survey questionnaires were developed and e-mailed to the all of the university students in Taichung, Taiwan. The first one and second one are the same except the construct openness. The first one was delivered in late 2015 while the second one was delivered in the middle 2016. After the authors eliminated incomplete responses and duplicates, 995 and 854 usable responses from platform users remained, respectively, and were used to test the relationships in the model.

Findings
The model can account for more than 75 percent of the variance in continuance intention. The research results affirm prior findings that satisfaction has a strong direct influence on intention. Among the three interaction factors, human-message interaction on the platform has the strongest effect on satisfaction. This study found that the effects of interactions and motivation on MOOC and non-MOOC platforms were consistent and similar. Moreover, perceived openness was found to influence usage intention but its effects were relative low.

Originality/value
The model demonstrated good explanatory power for continued intention in the context of MOOCs. This study provides a better understanding of the relationships among interactions, motivations, perceived openness, and continuance intention.
Non-linear fracture analysis of multilayered two-dimensional graded beams
Authors: Rizov Victor 
Published: February 2018

Purpose
The purpose of this paper is to present an analytical study of the delamination fracture behaviour of a multilayered two-dimensional functionally graded cantilever beam configuration. A delamination crack is located arbitrary along the height of the beam cross-section. The layers have different thicknesses and material properties. Perfect adhesion is assumed between layers. The material is functionally graded in both thickness and width directions in each layer. Besides, the material of the beam exhibits non-linear-elastic behaviour.

Design/methodology/approach
The delamination fracture behaviour is analysed in terms of the strain energy release rate. The J-integral approach is applied in order to verify the analysis of the strain energy release rate developed in the present paper.

Findings
The influence of material properties, the crack location along the height of the beam cross-section and the non-linear behaviour of the material on the delamination fracture is examined.

Originality/value
A non-linear delamination fracture analysis of multilayered two-dimensional non-symmetric functionally graded beam configuration is developed.
Case of atopic dermatitis concurrent with idiopathic thrombocytopenic purpura, whose serum thymus and activation‐regulated chemokine level remained undetectable
Authors: Ozawa Maki , Sasahara Yoji , Aiba Setsuya 
Published: February 2018

AbstractWe report a 9‐year‐old Japanese female patient with atopic dermatitis associated with idiopathic thrombocytopenic purpura. She demonstrated high serum immunoglobulin (Ig)E and IgE specific to several environmental allergens, but extremely low serum thymus and activation‐regulated chemokine (TARC) levels regardless of the disease progression. This case suggests platelets as the main source of serum TARC.
Rapid effects of elevated stress hormones on male courtship signals suggest a major role for the acute stress response in intra‐ and intersexual selection
Authors: Leary Christopher J. , Crocker‐Buta Sarah 
Published: February 2018

AbstractShort‐term elevations in circulating stress hormones (glucocorticoids) often mediate reduced investment in reproductive behaviour in favour of self‐maintenance and survival, but the significance of these effects in sexual selection and communication remain largely unexplored.Here we examine the acute stress response in the context of intra‐ and intersexual selection in the green treefrogHyla cinerea. Males of this species produce agonistic acoustic signals that stimulate elevations in the stress hormone corticosterone (CORT) in rival males, suggesting a central role forCORTin male–male competition. We hypothesized that elevatedCORTlevels in losers of vocal contests mediate an increase in the energy allocated towards self‐maintenance and survival that compromises investment in courtship signalling, resulting in reduced attractiveness to females.Consistent with this hypothesis, we show thatCORTadministration to calling males, simulatingCORTproduction in vocal contest losers, caused a rapid reduction in the duration of advertisement calls and vocal effort. ElevatedCORTalso increased the propensity to produce aggressive calls during simulated territorial intrusions that was followed by an increased probability of non‐calling “satellite” mating behaviour. This suite ofCORTeffects on vocal behaviour are known to decrease attractiveness to females and were not related to a decrease in androgen level or differences in body condition inCORT‐ vs. saline‐injected males.Our results suggest thatCORTproduction during intraspecific vocal contests compromises male attractiveness. Male vocalizations may therefore reliably indicate recent contest outcomes and/or the stress status of males, implicatingCORTas a mediator of honest signalling. We propose that the effects of agonistic acoustic signals onCORTproduction in this species are maintained byCORT‐mediated life‐history trade‐offs; decreased conspicuous signalling in high stress‐responsive males potentially increases survival by reducing the likelihood of escalated contests with dominant males and detection by predators. Adoption of alternative non‐calling satellite mating tactics may contribute to maintaining individual variation in stress responsiveness by increasing the chances that competitively inferior males acquire mates.Aplain language summaryis available for this article.
Negative effects of litter richness on root decomposition in the presence of detritivores
Authors: Li Yinong , Chen Xi , Veen G. F. (Ciska) , Eisenhauer Nico , Liang Yu , Zhou Xiaomei , Zhang Naili , Ma Keping 
Published: February 2018

Abstract

Decomposition is a vital process underlying many ecosystem functions. Although a growing number of studies have tested how litter richness affects the decomposition of above‐ground plant organs, knowledge remains limited about the decomposition of root mixtures. Here, we used a field experiment in a subtropical forest to investigate how species richness in root litter mixtures (air‐dried fresh fine roots) affects the decomposition of root litter material.

On the basis of the concept of resource complementarity, we hypothesized that root litter would decompose faster as the richness of the root litter mixture increased. In addition, we expected the presence of detritivores would modify the effect of root richness on mass loss, because detritivores might experience bottom‐up effects from specific plant species and might affect microbial decomposer communities.

We found that the richness level of root litter mixtures did not affect mass loss in the absence of detritivores. In the presence of detritivores, all root litter types decomposed faster. Notably, the positive effect of detritivores was stronger at low root litter richness than at high root litter richness, particularly during the early stages of decomposition (the first two sampling points) when litter mass loss was roughly double at low root litter richness compared to that at high root litter richness. The composition of the root fungal community measured at the last sampling point did not differ significantly across root richness levels, and was not affected by the presence of detritivores.

Synthesis. Our findings demonstrate that detritivores modify the relationship between root litter diversity and root litter decomposition in subtropical forest ecosystems. This highlights an importance of cascade effects between different trophic organisms on ecosystem functioning.

A plain language summary is available for this article.
Crop rotation and agri‐environment schemes determine bumblebee communities via flower resources
Authors: Marja Riho , Viik Eneli , Mänd Marika , Phillips James , Klein Alexandra‐Maria , Batáry Péter 
Published: February 2018

Abstract

In many parts of the world, farmland pollinators decreased significantly during the last half of the 20th century mainly due to land‐use changes and agricultural intensification.

We studied the effect of different typical crop rotations and agri‐environment schemes (AES) on bumblebee diversity in Estonia. We compared species abundances between four crop rotation types (cereal rollover [no change from 1 year to the next], cereal to mass‐flowering crops [hereafter MFC], MFC rollover and MFC to cereal fields) where all counts were conducted in the second year and in three farming types (conventional farming, organic farming and environmentally friendly management).

We surveyed bumblebees and flower cover along 401 field margins in five consecutive years and recorded 20 species and more than 6,000 individuals. Abundances of long‐tongued and threatened bumblebee species were higher at the field margins of cereal rollover fields than for the other three crop rotation types. In addition, cereal rollover field margins had higher abundances of medium colony species, generalists and forest‐scrub species than MFC rollover and MFC to cereal or cereal to MFC field margins. Bumblebee species richness was higher at the field margins of both AES types than those of conventional farming. However, in general, the strongest driver of bumblebee presence was flower cover.

Higher bumblebee abundances in cereal rollover field margins were probably owing to a concentration effect there and/or a dilution effect into MFC fields. Both AES schemes supported increasing flower cover in field margins and thereby diversity of bumblebees, indicating positive AES impacts upon wild pollinators.

Synthesis and applications. Crop rotation and agri‐environment schemes determine bumblebee richness and abundance via the availability of flower resources, but crop rotation constrains bumblebees differently based on their traits. Therefore, future agri‐environmental policy should account for these management options. Crop rotation could be a simple, but efficient solution to increase the biodiversity of agricultural landscapes.