bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evidence for the Existence of Abundant Intracluster Light at z = 1.24
Authors: Ko Jongwan , Jee M. James 
Published: July 2018

Abstract
Intracluster stars are believed to be unbound from their progenitor galaxies and diffused throughout the galaxy cluster, creating intracluster light (ICL). However, when and how these stars form is still under debate. To directly constrain the origin, one powerful method is to study clusters at the epoch when mature galaxy clusters began to appear. We report measurements of the spatial distribution, color, and quantity of diffuse intracluster stars for a massive galaxy cluster at a redshift of 1.24. This is the most distant galaxy cluster to date for which those three properties of the ICL have been quantified simultaneously. Our detection of the significant ICL fraction in this unprecedentedly high-redshift regime strongly indicates that intracluster stars, contrary to most previous studies, might have formed during a short period and early in the history of the Virgo-like massive cluster formation and might be concurrent with the formation of the brightest cluster galaxy.
Ultra-red Galaxies Signpost Candidate Protoclusters at High Redshift
Authors: Lewis A. J. R. , Ivison R. J. , Best P. N. , Simpson J. M. , Weiss A. , Oteo I. , Zhang Z-Y. , Arumugam V. , Bremer M. N. , Chapman S. C. , Clements D. L. , Dannerbauer H. , Dunne L. , Eales S. , Maddox S. , Oliver S. J. , Omont A. , Riechers D. A. , Serjeant S. , Valiante E. , Wardlow J. , Werf P. van der , Zotti G. De 
Published: July 2018

Abstract
We present images obtained with LABOCA of a sample of 22 galaxies selected via their red Herschel SPIRE colors. We aim to see if these luminous, rare, and distant galaxies are signposting dense regions in the early universe. Our 870 μm survey covers an area of ≈1 deg2 down to an average rms of

, with our five deepest maps going ≈2× deeper still. We catalog 86 dusty star-forming galaxies (DSFGs) around our “signposts,” detected above a significance of 3.5σ. This implies a

overdensity of

(or

) DSFGs, excluding our signposts, when comparing our number counts to those in “blank fields.” Thus, we are 99.93% confident that our signposts are pinpointing overdense regions in the universe, and ≈95% [50%] confident that these regions are overdense by a factor of at least ≥1.5 × [2×]. Using template spectral energy distributions (SEDs) and SPIRE/LABOCA photometry, we derive a median photometric redshift of z = 3.2 ± 0.2 for our signposts, with an inter-quartile range of z = 2.8–3.6, somewhat higher than expected for ∼850 μm selected galaxies. We constrain the DSFGs that are likely responsible for this overdensity to within

of their respective signposts. These “associated” DSFGs are radially distributed within (physical) distances of 1.6 ± 0.5 Mpc from their signposts, have median star formation rates (SFRs) of

(for a Salpeter stellar inital mass function) and median gas reservoirs of

. These candidate protoclusters have average total SFRs of at least

and space densities of ∼9 × 10−7 Mpc−3, consistent with the idea that their constituents may evolve to become massive early-type galaxies in the centers of the rich galaxy clusters we see today.
Stellar Populations in the Outer Disk and Halo of the Spiral Galaxy M101
Authors: Mihos J. Christopher , Durrell Patrick R. , Feldmeier John J. , Harding Paul , Watkins Aaron E. 
Published: July 2018

Abstract
We use deep Hubble Space Telescope imaging in the outskirts of the nearby spiral M101 to study stellar populations in the galaxy’s outer disk and halo. Our Advanced Camera for Surveys (ACS) field lies 17.′6 (36 kpc) from the center of M101 and targets the blue “NE Plume” of M101's outer disk, while the parallel Wide Field Camera 3 (WFC3) field lies at a distance of 23.′3 (47 kpc) to sample the galaxy’s stellar halo. The WFC3 halo field shows a well-defined red giant branch characterized by low metallicity ([M/H] = −1.7 ± 0.2), with no evidence of young stellar populations. In contrast, the ACS disk field shows multiple stellar populations, including a young main sequence, blue and red helium-burning stars, and old RGB and asymptotic giant branch (AGB) populations. The mean metallicity of these disk stars is quite low: [M/H] = −1.3 ± 0.2 for the RGB population, and −1.15 ± 0.2 for the younger helium-burning sequences. Of particular interest is a bunching of stars along the BHeB sequence, indicative of an evolving cohort of massive young stars. We show that the young stellar populations in this field are well-described by a decaying burst of star formation that peaked ∼300–400 Myr ago, along with a more extended star formation history to produce the older RGB and AGB populations. These results confirm and extend the results from our previous deep surface photometry of M101's outer disk, providing an important cross-check on stellar population studies using resolved stellar populations versus integrated light photometry. We discuss our results in the context of halo formation models and the interaction history of M101 and its companions.
CUBE: An Information-optimized Parallel Cosmological N-body Algorithm
Authors: Yu Hao-Ran , Pen Ue-Li , Wang Xin 
Published: July 2018

Abstract
Cosmological large-scale structure N-body simulations are computation-light, memory-heavy problems in supercomputing. The considerable amount of memory is usually dominated by an inefficient way of storing more than sufficient phase space information of particles. We present a new parallel, information-optimized, particle-mesh-based N-body code CUBE, in which information-efficiency and memory-efficiency are increased by nearly an order of magnitude. This is accomplished by storing particle’s relative phase space coordinates instead of global values, and in the format of fixed point as light as 1 byte. The remaining information is given by complementary density and velocity fields (negligible in memory space) and proper ordering of particles (no extra memory). Our numerical experiments show that this information-optimized N-body algorithm provides accurate results within the error of the particle-mesh algorithm. This significant lowering of the memory-to-computation ratio breaks the bottleneck of scaling up and speeding up large cosmological N-body simulations on multi-core and heterogeneous computing systems.
TANGOS: The Agile Numerical Galaxy Organization System
Authors: Pontzen Andrew , Tremmel Michael 
Published: July 2018

Abstract
We present tangos, a Python framework and web interface for database-driven analysis of numerical structure formation simulations. To understand the role that such a tool can play, consider constructing a history for the absolute magnitude of each galaxy within a simulation. The magnitudes must first be calculated for all halos at all timesteps and then linked using a merger tree; folding the required information into a final analysis can entail significant effort. Tangos is a generic solution to this information organization problem, aiming to free users from the details of data management. At the querying stage, our example of gathering properties over history is reduced to a few clicks or a simple, single-line Python command. The framework is highly extensible; in particular, users are expected to define their own properties, which tangos will write into the database. A variety of parallelization options are available and the raw simulation data can be read using existing libraries such as pynbody or yt. Finally, tangos-based databases and analysis pipelines can easily be shared with collaborators or the broader community to ensure reproducibility. User documentation is provided separately.
Mass Assembly of Stellar Systems and Their Evolution with the SMA (MASSES)—1.3 mm Subcompact Data Release
Authors: Stephens Ian W. , Dunham Michael M. , Myers Philip C. , Pokhrel Riwaj , Bourke Tyler L. , Vorobyov Eduard I. , Tobin John J. , Sadavoy Sarah I. , Pineda Jaime E. , Offner Stella S. R. , Lee Katherine I. , Kristensen Lars E. , Jørgensen Jes K. , Goodman Alyssa A. , Arce Héctor G. , Gurwell Mark 
Published: July 2018

Abstract
We present the Mass Assembly of Stellar Systems and their Evolution with the SMA (MASSES) survey, which uses the Submillimeter Array (SMA) interferometer to map the continuum and molecular lines for all 74 known Class 0/I protostellar systems in the Perseus molecular cloud. The primary goal of the survey is to observe an unbiased sample of young protostars in a single molecular cloud so that we can characterize the evolution of protostars. This paper releases the MASSES 1.3 mm data from the subcompact configuration (∼4″ or ∼1000 au resolution), which is the SMA’s most compact array configuration. We release both uv visibility data and imaged data for the spectral lines CO(2–1), 13CO(2–1), C18O(2–1), and N2D+(3–2), as well as for the 1.3 mm continuum. We identify the tracers that are detected toward each source. We also show example images of continuum and CO(2–1) outflows, analyze C18O(2–1) spectra, and present data from the SVS 13 star-forming region. The calculated envelope masses from the continuum show a decreasing trend with bolometric temperature (a proxy for age). Typical C18O(2–1) line widths are 1.45 km s−1, which is higher than the C18O line widths detected toward Perseus filaments and cores. We find that N2D+(3–2) is significantly more likely to be detected toward younger protostars. We show that the protostars in SVS 13 are contained within filamentary structures as traced by C18O(2–1) and N2D+(3–2). We also present the locations of SVS 13A’s high-velocity (absolute line-of-sight velocities >150 km s−1) red and blue outflow components. Data can be downloaded from https://dataverse.harvard.edu/dataverse/MASSES.
Peut-on parler d’engagement affectif et d’engagement calculé chez les agents publics africains ?
Authors: Vigan Fanou Arsène 
Published: July 2018

Cette recherche vise à analyser la pertinence et la dimensionnalité des engagements affectif et calculé au sens de Meyer et Allen dans un contexte africain. Les résultats de l’analyse factorielle exploratoire et de l’analyse factorielle confirmatoire sur deux échantillons d’agents publics béninois montrent que l’engagement affectif et l’engagement calculé sont des concepts pertinents dans ce contexte. Cependant, contrairement aux études antérieures, l’engagement affectif s’est révélé comme un concept composé de deux sous-dimensions distinctes : l’attachement social et l’attachement aux valeurs organisationnelles. Les deux sous-dimensions généralement trouvées dans la littérature pour l’engagement calculé ont été confirmées. Les implications de ces résultats sont discutées.
Management des biens communs de la connaissance : principes de conception et gouvernance de l’action collective
Authors: Amabile Serge , Peneranda Adrien , Haller Coralie 
Published: July 2018

L’étude de l’action collective dans la gestion des biens communs par des communautés auto-organisées est un thème qui a suscité une littérature originale sur la gouvernance et les formes institutionnelles alternatives depuis cinq décennies. La richesse de ces développements a été confirmée par l’attribution du Prix Nobel d’Économie 2009 à E. Ostrom. Les recherches de l’école de Bloomington d’Ostrom ont permis de découvrir plusieurs principes de conception des systèmes de ressources communes qui, lorsqu’ils sont présents, favorisent une gestion collective pérenne de ces ressources. Ces résultats ont montré leur pertinence au-delà des seuls systèmes de ressources physiques. Hess et Ostrom ont ainsi appelé la communauté scientifique à s’intéresser à la gestion collective des connaissances vues comme une ressource partagée. Cet article propose de répondre à cet appel en explorant les possibilités d’adaptation du cadre d’analyse des biens communs à des situations de coopération dans lesquelles des acteurs gèrent des informations mutualisées. La question de recherche étudiée a pour objectif de comprendre comment des individus peuvent s’auto-organiser au moyen d’institutions durables pour gérer la production et l’utilisation de connaissances communes. Nous avons mené cinq études de cas en mobilisant une méthodologie de recherche qualitative. Les résultats montrent que le fonctionnement sur le long terme des collectifs auto-organisés s’inscrivant dans le cadre conceptuel d’Ostrom semble conduire à une gestion durable et efficiente de la ressource informationnelle.
“Too Fast, Too Furious” ? Trading algorithmique et instabilité des marchés financiers
Authors: Arena Lise , Oriol Nathalie , Veryzhenko Iryna 
Published: July 2018

En quoi les stratégies de trading algorithmique peuvent-elles expliquer la propagation de flash crashes sur le marché financier ? L’originalité de traiter cette question réside dans le besoin de croiser deux champs disciplinaires : la finance de marché et la gestion des systèmes d’information. Cet article se fonde sur une approche de simulation multi-agents construite à partir d’une catégorisation réaliste des stratégies des traders, de leurs recours aux systèmes de trading algorithmique et du rôle des systèmes transactionnels d’appariement au niveau du marché. Parmi les résultats exposés, nous montrons qu’en favorisant les stratégies fondées sur la vitesse, l’usage des nouvelles technologies peut porter atteinte à la résilience et à la stabilité des marchés face à de potentiels chocs opérationnels intra journaliers. Nous montrons également, à travers l’illustration de la décimalisation, les conséquences d’un changement de règle sur l’anatomie du crash, et le rôle des systèmes de traitement transactionnels dans la propagation de ces crises financières d’un genre nouveau.
Experience of Ubiquitous Computing Technology Driven Mobile Commerce in Africa: Impact of Usability, Privacy, Trust, and Reputation Concern
Authors: Olaleye Sunday Adewale , Oyelere Solomon Sunday , Sanusi Ismaila Temitayo , Agbo Joseph Friday 
Published: July 2018

<p>The concept of ubiquitous computing allows the seamless: anywhere, anytime, anyone interaction of computing devices and technology. Ubiquitous commerce simply known as u-commerce is an evolution of commerce based on recent innovations and advancement in computing technology. The aim of this study is to understand the impact of ubiquitous computing technologies on users, with a special focus on ubiquitous commerce. The study used the quantitative method and targeted the mobile device users for online shopping in Nigeria with convenience sampling technique. The data collected was analyzed using SmartPLS 2.0 with partial least square structural equation modelling. The study results confirmed the significant role of trust as a mediator between the reputation and u-commerce user’s experience, and usability and privacy directly predict the ubiquitous commerce user’s experience. The study advances with managerial implications and finally pinpoint the limitations and propose future studies.</p>
Design Guidelines for Creating Mobile Language Learning Applications
Authors: Jamaldeen Fazeena , Hewagamage Priyantha , Ekanayaka Yamaya 
Published: July 2018

<p class="0abstract">Mobile devices have proven to be an appropriate tool which expands the horizons of learning beyond the classroom through means of flexibility and portability. Throughout this study, the authors have worked with a set of design guidelines which were derived from the literature. The artifact developed considering these design guidelines has been evaluated among various user groups for better understanding of m-learning as a tool to support English Language Learning. Findings of these evaluations have been used to improve the design guidelines. The authors also identify the effectiveness of mobile learning as a supporting medium of learning and as a primary medium of learning among different learner groups, which is another outcome of this study. </p>
The Design and Implementation of a Mathematics Game-Base Learning Application for Primary Students
Authors: Aljojo Nahla 
Published: July 2018

<p class="1">The traditional learning process used in schools is outdated. Students nowadays spend most of their time using technologies for entertainment and to communicate with their friends. Technology can also be used to present opportunities in teaching difficult subjects, such as mathematics, in a better environment. This project aims to improve the mathematical skills of addition and subtraction in young children aged 6 to 8 by combining education and entertainment in a simple math learning game<em>. </em>Using ideas from Jerome Bruner’s theory, and Bloom’s Taxonomy of cognitive goals, this application will help children learn and interact effectively with the world around them. This project presents the design and development of a game-based learning application that improves the mathematical skills of young children. Specifically, our target-users for this application are primary school students who are learning addition and subtraction. This paper provides discussion and guidance on how to evaluate the impact of Mathematics Game-Base Learning Application. The overall results of the experimental study indicate a positive effect of Mathematics Game-Base Learning Application on the learning process.</p>
Mobile Application Design Emergency Medical Call for the Deaf using UCD Method
Authors: Risald Risald , Suyoto Suyoto , Santoso Albertus Joko 
Published: July 2018

<p>Deaf or hearing loss is a condition of inability to hear something, either totally or partially. Hearing loss greatly affects the life of a person in communicating with the people around him. Deaf people will be very difficult when in a medical emergency, this is because the medical emergency situation requires fast action.</p><p> The Healthy Phone application is a mobile medical emergency call application that can help people with hearing impaired when in emergency situations. With the Healthy Phone application, the user only needs to select an icon that suits the situation encountered in touchscreen mobile device then the message will be sent to the nearest hospital.</p> To search for icons corresponding to emergencies, the User Centered Design (UCD) method is used. This application is very helpful for deaf people because this application does not require audio communication and user location is also sent automatically to the nearest hospital. The results were analyzed using four emergency event scenarios with a total score of 87% and an average user time of less than 0:42 sec indicating that the study was successful in designing a mobile medical emergency call application according to user requirements.
Exploring the internal antecedents that prompt consumers’ impulsive behaviour in experiential retail contexts
Authors: Retief Miriam-Miri , Erasmus Alet C. , Petzer Daniel J. 
Published: July 2018

Orientation: Experiential settings are becoming more popular to differentiate conventional brick-and-mortar retailing which now faces fierce competition from multiple other retail platforms.Research purpose: The study aims to identify and explain the internal driving forces that positively predict consumers’ impulsive behaviour in experiential retail settings.Research design, approach and method: This quantitative investigation entailed a retrospective assessment of consumers’ experiences at diverse experiential retailers. An electronic survey approach enabled the collection of 402 usable questionnaires based on a purposive sampling technique whereby a heterogeneous sample of consumers 18 years and above who have visited one of the identified experiential retailers were recruited. Stepwise regression analyses were conducted to test the hypothesised relationships between the independent and dependent variables.Main findings: Results suggest that consumers’ mood and emotions, adventure, gratification and social shopping motives as well as their desire for recreation are conducive to certain impulsive behavioural outcomes, namely irresistible desire creation, impulsive purchases and impulsive participation. A significant finding is that impulsive actions are not necessarily preceded by an irresistible urge. However, the urge to act on impulse is regarded a separate impulsive behavioural outcome.Practical/managerial implications: Impulsive behaviour should be regarded as a valuable outcome in terms of an understanding of consumers’ behaviour in experiential retail contexts. Not only does it offer retailers competitive advantage possibilities but it also constitutes more satisfying experiences for consumers.Contribution/value-add: A theoretical contribution is made in terms of an integration of literature on experiential retail and impulsive behaviour.
Policy experiments in an agent-based model with credit networks
Authors: Assenza Tiziana , Cardaci Alberto , Gatti Domenico Delli , Grazzini Jakob 
Published: July 2018

Abstract
In this paper the authors extend the macroeconomic agent-based model described in Delli Gatti, D., Desiderio, S., Gaffeo, E., Cirillo, P. and Gallegati, M. (Macroeconomics from the bottom-up, 2011) with the inclusion of a bank-bank network that mimics real-world dynamics of interbank markets. They also introduce a public sector and other modifications in order to carry out different policy experiments. More specifically, they test the implementation of a monetary policy by means of a standard Taylor rule, an unconventional monetary policy (i.e. helicopter drop) and a set of macroprudential regulations. The authors explore the properties of the model for such different scenarios. The results shed some light on the effectiveness of monetary and macroprudential policies in an economy with an interbank market during times of crises.
Navigating “Mixedness”: The Information Behaviours and Experiences of Biracial Youth in Australia
Authors: Mckie Indra Ayu Susan 
Published: July 2018

It is generally understood that, ‘for those deemed white, the idea of race serves as a vast source of unearned privilege within all facets of life; for those deemed coloured, it means susceptibility to countless forms of prejudice and racism’ (Nuttgens 2010, p. 255). But what does this mean for a person with indistinguishable physical features, who is questioned daily, “where are you from?” or, even more dehumanisingly – “what are you? In the current racial climate of Australia, biracial second-generation Australians are left to choose between two or more identities on how to behave in attempts to fit binary racial groups and expectations (Shih & Sanchez 2009).
This paper presents the data from six in-depth interviews with Asian biracial youth from across Sydney. The interviews explore how this group has confronted race while developing their own identities during adolescence, as well as how their understanding of being “mixed” has developed over time. In exploring this collective racial identity, I draw from my own racialised experiences to address emergent themes from my findings.
Numerous displays of information behaviours emerged from the participant’s stories of isolation, belonging and resentment towards their racial mixedness. Information avoidance, browsing, seeking and satisficing were observed within their daily experiences of school, family and social life. Such practices informed how these individuals internalised their inherited intersection of racial persecution and privilege. Critical engagement with information behaviours theories justifies the modern notions of identity as a continuous state of reconstruction (Hall 1996) as the biracial participants of this study struggle to find balance with the external validation of others and their driving agency to be themselves.