cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evaluating Indirect Strategies for Chinese-Spanish Statistical Machine Translation
Creators: name: Costa-jussà, Marta R.
name: Henríquez, Carlos A.
name: Banchs, Rafael E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Although, Chinese and Spanish are two of the most spoken languages in the world, not much research has been done in machine translation for this language pair. This paper focuses on investigating the state-of-the-art of Chinese-to-Spanish statistical machine translation (SMT), which nowadays is one of the most popular approaches to machine translation. For this purpose, we report details of the available parallel corpus which are Basic Traveller Expressions Corpus (BTEC), Holy Bible and United Nations (UN). Additionally, we conduct experimental work with the largest of these three corpora to explore alternative SMT strategies by means of using a pivot language. Three alternatives are considered for pivoting: cascading, pseudo-corpus and triangulation. As pivot language, we use either English, Arabic or French. Results show that, for a phrase-based SMT system, English is the best pivot language between Chinese and Spanish. We propose a system output combination using the pivot strategies which is capable of outperforming the direct translation strategy. The main objective of this work is motivating and involving the research community to work in this important pair of languages given their demographic impact.
Neutrosophic soft sets and neutrosophic soft matrices based on decision making
Creators: name: Deli, Irfan
name: Broumi, Said
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: Maji\cite{maj-13}, firstly proposed neutrosophic soft sets can handle the indeterminate information and inconsistent information which exists commonly in belief systems. In this paper, we have firstly redefined complement, union and compared our definitions of neutrosophic soft with the definitions given by Maji. Then, we have introduced the concept of neutrosophic soft matrix and their operators which are more functional to make theoretical studies in the neutrosophic soft set theory. The matrix is useful for storing an neutrosophic soft set in computer memory which are very useful and applicable. Finally, based on some of these matrix operations a efficient methodology named as NSM-decision making has been developed to solve neutrosophic soft set based group decision making problems.
title: Identity and Symbolic Universes in Voting Behavior. A study of the Italian society
Creators: name: Andreassi, Silvia
name: Signore, Fulvio
name: Cordella, Barbara
name: De Dominicis, Serena
name: Gennaro, Alessandro
name: Iuso, Salvatore
name: Kerusauskaite, Skaiste
name: Kosic, Ankica
name: Mannarini, Terri
name: Reho, Matteo
name: Rocchi, Giulia
name: Rochira, Alessia
name: Scharfbillig, Mario
name: Salvatore, Sergio
Publisher: name: Psychology Hub
Year: 2023

description: This study analyses the role played by identity motives and cultural worldviews in voting behavior. For this purpose, a representative national sample of Italian (N=3020) respondents completed a questionnaire battery, measuring political values, identity values, attitude towards immigrants and perceived identity threat, as well as cultural worldviews (symbolic universes). These variables were used in a model with the vote intention of respondents as an outcome variable, political values, identity motives and socio-demographics as direct predictors and symbolic universes as indirect predictors. Consistently with hypotheses, analyses revealed that the impact of identity motives is higher than that produced by socio-economic motives or political values. Symbolic universes indirectly influence identity motives and, therefore, voting behavior. Moreover, a multigroup analysis revealed that the influence of symbolic universes on voting behavior is higher in individuals exposed to higher uncertainty. Results are interpreted in the framework of Semiotic Cultural Psychology Theory, giving importance to high contextual uncertainty, characterising contemporary societies.
description: Psychology Hub, Vol. 40 No. 2 (2023)
CII in the Interstellar Medium: Excitation by H2 Revisited
Creators: name: Wiesenfeld, Laurent
name: Goldsmith, Paul F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: C$^+$ is a critical constituent of many regions of the interstellar medium, as it can be a major reservoir of carbon and, under a wide range of conditions, the dominant gas coolant. Emission from its 158$μ$m fine structure line is used to trace the structure of photon dominated regions in the Milky Way and is often employed as a measure of the star formation rate in external galaxies. Under most conditions, the emission from the single [CII] line is proportional to the collisional excitation rate coefficient. We here used improved calculations of the deexcitation rate of [CII] by collisions with H$_2$ to calculate more accurate expressions for interstellar C$^+$ fine structure emission, its critical density, and its cooling rate. The collision rates in the new quantum calculation are $\sim$ 25% larger than those previously available, and narrow the difference between rates for excitation by atomic and molecular hydrogen. This results in [CII] excitation being quasi-independent of the molecular fraction and thus dependent only on the total hydrogen particle density. A convenient expression for the cooling rate at temperatures between 20 K and 400 K, assuming an LTE H$_2$ ortho to para ration is $Λ({\rm LTE~OPR}) = \left(11.5 + 4.0\,e^{-100\,\mathrm K/T^{\rm kin}}\right)\;e^{-91.25\,\mathrm K/T^{\rm kin}}\,n ({\rm C}^{+})\,n({\rm H}_2)\times 10^{-24}\;{\rm ergs}~{\rm cm}^{-3}~{\rm s}^{-1}$. The present work should allow more accurate and convenient analysis of the [\CII] line emission and its cooling.
A Hybrid LP-RPG Heuristic for Modelling Numeric Resource Flows in Planning
Creators: name: Coles, Amanda Jane
name: Coles, Andrew Ian
name: Fox, Maria
name: Long, Derek
Publisher: name: arXiv
Year: 2014
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Although the use of metric fluents is fundamental to many practical planning problems, the study of heuristics to support fully automated planners working with these fluents remains relatively unexplored. The most widely used heuristic is the relaxation of metric fluents into interval-valued variables --- an idea first proposed a decade ago. Other heuristics depend on domain encodings that supply additional information about fluents, such as capacity constraints or other resource-related annotations. A particular challenge to these approaches is in handling interactions between metric fluents that represent exchange, such as the transformation of quantities of raw materials into quantities of processed goods, or trading of money for materials. The usual relaxation of metric fluents is often very poor in these situations, since it does not recognise that resources, once spent, are no longer available to be spent again. We present a heuristic for numeric planning problems building on the propositional relaxed planning graph, but using a mathematical program for numeric reasoning. We define a class of producer--consumer planning problems and demonstrate how the numeric constraints in these can be modelled in a mixed integer program (MIP). This MIP is then combined with a metric Relaxed Planning Graph (RPG) heuristic to produce an integrated hybrid heuristic. The MIP tracks resource use more accurately than the usual relaxation, but relaxes the ordering of actions, while the RPG captures the causal propositional aspects of the problem. We discuss how these two components interact to produce a single unified heuristic and go on to explore how further numeric features of planning problems can be integrated into the MIP. We show that encoding a limited subset of the propositional problem to augment the MIP can yield more accurate guidance, partly by exploiting structure such as propositional landmarks and propositional resources. Our results show that the use of this heuristic enhances scalability on problems where numeric resource interaction is key in finding a solution.
Cosmologies with turning points
Creators: name: Holdom, Bob
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We explore singularity-free and geodesically-complete cosmologies based on manifolds that are not quite Lorentzian. The metric can be either smooth everywhere or non-degenerate everywhere, but not both, depending on the coordinate system. The smooth metric gives an Einstein tensor that is first order in derivatives while the non-degenerate metric has a piecewise FLRW form. On such a manifold the universe can transition from expanding to contracting, or vice versa, with the Einstein equations satisfied everywhere and without violation of standard energy conditions. We also obtain a corresponding extension of the Kasner vacuum solutions on such manifolds.
description: 12 pages, to appear in Physics Letters B
title: The Importance of Reappraisal and Deaccessioning in Collegiate Archives in the Pacific Northwest
Creators: name: Buehn, Courtney
Publisher: name: Utah State University
Year: 2020

description: This article examines the current reappraisal practices and procedures of archives, and investigates the need for official deaccessioning policies through the analysis of literature in the field and eight personal interviews conducted with professionals in universities in the Pacific Northwest. These persons were asked about the initial appraisal procedure of their repository, the current reappraisal process done without an official policy, and the factors that contribute to the decisions made concerning deaccessioning. Formal policies for appraisal and deaccessioning are important for responsible management of individual archival repositories, and also for the development of archival communities.
The Concentration-Mass Relation of Massive, Dynamically Relaxed Galaxy Clusters: Agreement Between Observations and $Λ$CDM Simulations
Creators: name: Darragh-Ford, Elise
name: Mantz, Adam B.
name: Rasia, Elena
name: Allen, Steven W.
name: Morris, R. Glenn
name: Foster, Jack
name: Schmidt, Robert W.
name: Wenrich, Guillermo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The relationship linking a galaxy cluster's total mass with the concentration of its mass profile and its redshift is a fundamental prediction of the Cold Dark Matter (CDM) paradigm of cosmic structure formation. However, confronting those predictions with observations is complicated by the fact that simulated clusters are not representative of observed samples where detailed mass profile constraints are possible. In this work, we calculate the Symmetry-Peakiness-Alignment (SPA) morphology metrics for maps of X-ray emissivity from THE THREE HUNDRED project hydrodynamical simulations of galaxy clusters at four redshifts, and thereby select a sample of morphologically relaxed, simulated clusters, using observational criteria. These clusters have on average earlier formation times than the full sample, confirming that they are both morphologically and dynamically more relaxed than typical. We constrain the concentration-mass-redshift relation of both the relaxed and complete sample of simulated clusters, assuming power-law dependences on mass ($κ_m$) and $1+z$ ($κ_ζ$), finding $κ_m = -0.12 \pm 0.07$ and $κ_ζ= -0.27 \pm 0.19$ for the relaxed subsample. From an equivalently selected sample of massive, relaxed clusters observed with ${\it Chandra}$, we find $κ_m = -0.12 \pm 0.08$ and $κ_ζ= -0.48 \pm 0.19$, in good agreement with the simulation predictions. The simulated and observed samples also agree well on the average concentration at a pivot mass and redshift providing further validation of the $Λ$CDM paradigm in the properties of the largest gravitationally collapsed structures observed. This also represents the first clear detection of decreasing concentration with redshift, a longstanding prediction of simulations, in data.
description: 10 pages, 10 figures. Accepted by MNRAS
Necessary and sufficient conditions for the existence of torsion-free covariant derivatives with prescribed curvature tensor
Creators: name: Basurto Arzate, Efrain
Publisher: name: TU Dortmund
Year: 2022
Subjects: subject: Manifold
subject: Curvature tensor
subject: Torsion-free connection
subject: 510
subject: Mannigfaltigkeit
subject: Krümmung
subject: Kovariante Differentiation

description: Diese Dissertation behandelt das Problem, torsionsfreie kovariante Ableitungen mit vorgeschriebener Krümmung zu konstruieren. Die Krümmung einer solchen kovarianten Ableitung erfüllt notwendigerweise die Bianchi-Identitäten. Das Hauptresultat der Arbeit besagt, dass diese Bedingungen bereits hinreichend sind: jede analytische Krümmungsabbildung, die die Bianchi-Identitäten erfüllt, kann lokal als Krümmung einer eindeutigen torsionsfreien kovarianten Ableitung realisiert werden. Als Anwendungen dieses Resultats in der Holonomietheorie können wir die lokalen Existenzresultate für Riemannsche Metriken mit spezieller Holonomie von Calabi, Yau, Bryant etc. vereinheitlichen und wesentlich vereinfachen
description: This dissertation deals with the problem of constructing torsion-free covariant derivatives with prescribed curvature. The curvature of a such covariant derivative necessarily satisfies the Bianchi identities. The main result of the present work asserts that these identities are enough to achieve this: any analytic curvature map which satisfies the Bianchi identities, can locally be realized as the curvature of a unique torsion-free covariant derivative. As applications of this result in Holonomy Theory, we can unify in a simple way all of the local existence results of Calabi, Yau, and Bryant, among others, for Riemannian metrics with special holonomy.
title: The Bonds of Organization: Zine Archives and the Archival Tradition
Creators: name: Woodbrook, Rachel
name: Lazzaro, Althea
Publisher: name: Utah State University
Year: 2020

description: There is a current movement amongst zine archives toward collaboration and the standardization of policies and practices. As a relatively new area of archival collecting, zine archives are progressing through core archival issues at a rapid pace; this progression provides an opportunity for them to redefine traditional archival practices in relation to their specific needs.
The community-based nature of their collections compel zine archivists and librarians to include their unique audiences in the mapping of traditional practices onto the organic structures of their largely grassroots organizations: they are translators and interpreters between archival theory and this grassroots practice. Ideally, this results in a symbiotic balance by which the archives invite and sustain community involvement, while the community benefits from the formal organization and resulting accessibility provided by established, time-tested library and archival traditions.
The following paper discusses the new movement within archival practice that is arising to support the community-inclusive and decentralized work going on in zine archives and libraries around the country, focusing on the Zine Archive and Publishing Project (ZAPP) in Seattle; the Independent Publishing Resource Center (IPRC) in Portland; and Barnard Zine Library in New York City as examples. It reviews the special challenges that zines, as a form, present for the archivist, and considers the opportunities for reflection and redefinition that these challenges present for more traditional archival communities. The research included draws on interviews with zine library and archive staff, zine community documentation about the process of archiving zines, and traditional archival scholarship and theory.
Lifted Variable Elimination: Decoupling the Operators from the Constraint Language
Creators: name: Taghipour, Nima
name: Fierens, Daan
name: Davis, Jesse
name: Blockeel, Hendrik
Publisher: name: arXiv
Year: 2014
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Lifted probabilistic inference algorithms exploit regularities in the structure of graphical models to perform inference more efficiently. More specifically, they identify groups of interchangeable variables and perform inference once per group, as opposed to once per variable. The groups are defined by means of constraints, so the flexibility of the grouping is determined by the expressivity of the constraint language. Existing approaches for exact lifted inference use specific languages for (in)equality constraints, which often have limited expressivity. In this article, we decouple lifted inference from the constraint language. We define operators for lifted inference in terms of relational algebra operators, so that they operate on the semantic level (the constraints extension) rather than on the syntactic level, making them language-independent. As a result, lifted inference can be performed using more powerful constraint languages, which provide more opportunities for lifting. We empirically demonstrate that this can improve inference efficiency by orders of magnitude, allowing exact inference where until now only approximate inference was feasible.
title: Ενεργειακή αναβάθμιση σε υφιστάμενο δημόσιο κτίριο. Μελέτη και τρόποι εξοικονόμησης ενέργειας για την ενεργειακή αναβάθμιση του κτιρίου με χρήση συμβατικών εναλλακτικών μορφών ενέργειας και υψηλών προδιαγραφών δομικά υλικά
title: Upgrading the energy efficiency performance of an existing public building (net to zero energy buildings – n.zeb) measures relating to energy efficiency, saving energy consumption, and adequate measures taken to achieve targets, by using energy efficient materials
titleType: AlternativeTitle
Creators: name: Μαρκάτος, Γεράσιμος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Ενεργειακή αναβάθμιση
Εξοικονόμηση ενέργειας
Λογισμικό ΤΕΕ-ΚΕΝΑΚ

description: Συλλογή πληροφοριών & σχεδίων (κατόψεων και τομών του κτιρίου) Μέθοδοι αποτύπωσης ανοιγμάτων. Μελέτη τεχνικών οδηγιών ΤΟΤΕΕ, ΚΕΝΑΚ. Καταχώρηση δεδομένων στο λογισμικό ενεργειακής επιθεώρησης κτιρίων. Διερεύνηση υλικών και θερμομονωτικών ιδιοτήτων. Δημιουργία σεναρίων αναβάθμισης. Σχολιασμός σεναρίων και σύγκριση. Μελέτη αποδοτικότητας, σύνταξη προϋπολογισμού. Εκτίμηση χρόνου απόσβεσης παρεμβάσεων.
title: Primary Sources on C. E. Kelsey and the Northern California Indian Association
Creators: name: Miller, Larisa K.
Publisher: name: Utah State University
Year: 2020

description: This article provides a brief history of and identifies primary sources on C. E. Kelsey and the Northern California Indian Association, which brought federal support to the nonreservation Indians of northern California in the early 1900s. Kelsey is a frequently mentioned but largely unknown figure in the unique history of Indian-white relations in California. As an officer of the Northern California Indian Association (NCIA) and special agent for the Indian Office he altered the landscape for California Indians. Because there is no corpus of Kelsey's personal papers, NCIA records, or government records, he remains largely unknown, to the point that authors and archivists have sometimes misnamed him.
Psychometric evaluation of the Italian Revised Exercise Addiction Inventory (EAI-R) among Italian speaking exercisers: Confirmatory factor analysis
Creators: name: Soraci, Paolo
name: Szabo, Attila
name: Vegni, Nicoletta
name: Prestano, Claudia
name: Guaitoli, Eleonora
name: Di Bernardo, Carla
name: Orati, Luca
name: Tiozzo Brasiola, Roberta
name: Chini, Elisa
name: Iraso, Claudia
name: Abbatuccolo, Laura
name: Griffiths, Mark D.
Publisher: name: Psychology Hub
Year: 2023

description: Background: The Exercise Addiction Inventory (EAI) is a valid and reliable instrument and has been used in numerous contexts and research studies. The EAI was recently revised (EAI-R), but the psychometric properties of the EAI-R have yet to be examined in an Italian context. Therefore, the present study aimed to validate the EAI-R among Italian-speaking exercisers. Methods: The sample comprised 200 Italian-speaking exercisers comprised (62% females, 48% male; mean age = 35 years, SD±11.42), who completed a survey including the EAI-R, Depression Anxiety and Stress Scale-21 (DASS-21), Rosenberg’s Self-Esteem Scale (RSES), and Exercise Dependence Scale-Revised (EDS-R). Results: Confirmatory factor analysis (CFA) showed the EAI-R had good psychometric characteristics (Cronbach’s α = 0.90) and confirmed the scale’s unidimensional properties. Scores on the EAI-R were positively correlated with EDS-R scores, the number of weekly hours of exercise, and DASS-21 scores. Conversely, EAI-R scores were negatively correlated with the RSES scores and age. Conclusion: The EAI-R is a psychometrically reliable and valid measure for assessing the risk of exercise addiction among Italian adults. The study expands the literature on exercise addiction and demonstrates important associational factors in the Italian context.
description: Psychology Hub, Vol. 40 No. 2 (2023)
The non-explosive stellar merging origin of the ultra-massive carbon-rich white dwarfs
Creators: name: Kawka, Adela
name: Ferrario, Lilia
name: Vennes, Stephane
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have investigated the origin of a sub-class of carbon-polluted white dwarfs (DQ) originally identified as the ``hot DQ" white dwarfs. These objects are relatively hot (10 000 < T_eff < 25 000 K), have markedly higher carbon abundance (C-enriched), are more massive (M > 0.8 M_Sun) than ordinary DQs (M ~ 0.6 M_Sun), and display high space velocities. Hence, despite their young appearance their kinematic properties are those of an old white dwarf population. The way out of this dilemma is to assume that they formed via the merging of two white dwarfs. In this paper we examine the observed characteristics of this population of ``C-enriched" DQ white dwarfs and confirm that nearly half of the 63 known objects have kinematic properties consistent with those of the Galactic thick disc or halo. We have also conducted population synthesis studies and found that the merging hypothesis is indeed compatible with observations. Studies of this sub-class of white dwarfs have important implications for our understanding of Type Ia Supernovae (SNeIa), commonly used to determine the expansion history of the universe, since the same formation channel applies to both kinds of objects. Hence probing the properties of these white dwarfs that failed to explode may yield important constraints to the modelling of the mechanisms leading to a thermonuclear runaway.
description: Accepted for publication in MNRAS
Extending an Open-Source Federated Identity Management System for Enhanced HPC Security
Creators: name: Buchmüller, Jennifer
name: Raffeiner, Simon
name: Simon, Michael
name: Obermaier, Holger
name: Weisbrod, Peter
name: Weiß, Ulrich
name: Nußbaumer, Martin
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2020
Subjects: IT Security
High-Performance Computing
HPC Security
Federated Identity Management
Identity Management

description: Strengthening the security infrastructure around HPC systems has become an urgent and important task, driven especially by the impact of a recent large-scale attack on the world-wide HPC community by a yet unknown party. Multiple European HPC systems had to be shut down for several weeks in mid-May of 2020 after backdoors were found on the systems. In the aftermath of the attack, two core security issues were identified: the absence of strong authentication, and a wide-spread practice of insecure handling of SSH key pairs. We present our approach for extending an existing, open source, federated identity management system with user-friendly two-factor authentication (2FA) using Time-Based One-Time Password (TOTP) and centralized, secure SSH key management. A special focus will be put on how we integrated scientific workflows and automation with the new security measures by combining 2FA, SSH key management and security policies in an elegant, secure and user-friendly way.
Racial anthropology in Turkey and transnational entanglements in the making of scientific knowledge: Seniha Tunakan’s academic trajectory, 1930s–1970s
Creators: name: Maksudyan, Nazan
Publisher: name: Freie Universität Berlin
Year: 2023
Subjects: subject: archeological human remains
subject: genetics
subject: physical anthropology
subject: racism
subject: twin research
subject: 900 Geschichte und Geografie::900 Geschichte::902 Verschiedenes

description: This article situates the trajectory of the academic life of Seniha Tunakan (1908–2000) within the development of anthropology as a scientific discipline in Turkey and its transnational connections to Europe during the interwar period and up until the second half of the 20th century. Relying on the archives of the Max-Planck-Gesellschaft, the archive of the Humboldt-Universität zu Berlin, the Politisches Archiv des Auswärtigen Amtes in Germany, and the Prime Ministry's Republican Archives in Turkey, it focuses on the doctoral studies of Seniha Tunakan in Germany and her life as a female PhD researcher in the capital of the Third Reich, as well as her entire research career after her return to Turkey. Through Tunakan's career, the article also provides an analysis of the perpetuation of German race science in the Turkish context, shedding light upon the success of the Kaiser-Wilhelm-Institut für Anthropologie, menschliche Erblehre und Eugenik (Kaiser Wilhelm Institute for Anthropology, Human Heredity, and Eugenics) and its transnational impact.
Global solar irradiation prediction using a multi-gene genetic programming approach
Creators: name: Pan, Indranil
name: Pandey, Daya Shankar
name: Das, Saptarshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In this paper, a nonlinear symbolic regression technique using an evolutionary algorithm known as multi-gene genetic programming (MGGP) is applied for a data-driven modelling between the dependent and the independent variables. The technique is applied for modelling the measured global solar irradiation and validated through numerical simulations. The proposed modelling technique shows improved results over the fuzzy logic and artificial neural network (ANN) based approaches as attempted by contemporary researchers. The method proposed here results in nonlinear analytical expressions, unlike those with neural networks which is essentially a black box modelling approach. This additional flexibility is an advantage from the modelling perspective and helps to discern the important variables which affect the prediction. Due to the evolutionary nature of the algorithm, it is able to get out of local minima and converge to a global optimum unlike the back-propagation (BP) algorithm used for training neural networks. This results in a better percentage fit than the ones obtained using neural networks by contemporary researchers. Also a hold-out cross validation is done on the obtained genetic programming (GP) results which show that the results generalize well to new data and do not over-fit the training samples. The multi-gene GP results are compared with those, obtained using its single-gene version and also the same with four classical regression models in order to show the effectiveness of the adopted approach.
description: 31 pages, 16 figures, 5 tables
The formation of long-period eccentric binaries with a helium white dwarf
Creators: name: Siess, L.
name: Davis, P. J.
name: Jorissen, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The recent discovery of long-period eccentric binaries hosting a He-WD or a sdB star has been challenging binary-star modelling. Based on accurate determinations of the stellar and orbital parameters for IP Eri, a K0 + He-WD system, we propose an evolutionary path that is able to explain the observational properties of this system and, in particular, to account for its high eccentricity (0.25). Our scenario invokes an enhanced-wind mass loss on the first red giant branch (RGB) in order to avoid mass transfer by Roche-lobe overflow, where tides systematically circularize the orbit. We explore how the evolution of the orbital parameters depends on the initial conditions and show that eccentricity can be preserved and even increased if the initial separation is large enough. The low spin velocity of the K0 giant implies that accretion of angular momentum from a (tidally-enhanced) RGB wind should not be efficient.
description: Accepted for publication in A&A
Who Are They and Where? Insights Into the Social and Spatial Dimensions of Imagined Audiences From a Mobile Diary Study of Twitter Users
Creators: name: Stoltenberg, Daniela
name: Pfetsch, Barbara
name: Keinert, Alexa
name: Waldherr, Annie
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: geographical scope
subject: imagined audience
subject: mobile experience sampling method
subject: online social networks
subject: social groups
subject: Twitter
subject: 000 Informatik, Informationswissenschaft, allgemeine Werke::070 Publizistische Medien, Journalismus, Verlagswesen::070 Publizistische Medien, Journalismus, Verlagswesen

description: Social media users hardly know who is reading their posts, but they form ideas about their readership. Researchers have coined the term imagined audience for the social groups that actors imagine seeing their public communication. However, social groups are not the only aspect that requires imagination: In the potentially borderless online environment, the geographical scope and locations of one’s audience are also unknown. Furthermore, research has demonstrated that imagined audiences vary between people and situations, but what explains these variations is unclear. In this article, we address these two gaps—the geographical scope and predictors of imagined audiences—using data from a mobile experience sampling method study of 105 active Twitter users from Berlin, Germany. Our results show that respondents mostly think of a geographically broad audience, which is spread out across the country or even globally. The imagined geographical scope and social groups depend on both the communicator and the usage situation. While the audience’s social composition especially depends on tweet content and respondents’ sociodemographic characteristics, the geographical scope is best explained by respondents’ biography and personal mobility, including their experience of living in other countries and local residential duration.
$L^{p}$ estimates for bilinear and multi-parameter Hilbert transforms
Creators: name: Dai, Wei
name: Lu, Guozhen
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B20, 42B15

description: C. Muscalu, J. Pipher, T. Tao and C. Thiele proved in \cite{MPTT1} that the standard bilinear and bi-parameter Hilbert transform does not satisfy any $L^{p}$ estimates. They also raised a question asking if a bilinear and bi-parameter multiplier operator defined by $$ T_{m}(f_{1},f_{2})(x):=\int_{\mathbb{R}^{4}}m(ξ,η)\hat{f_{1}}(ξ_{1},η_{1})\hat{f_{2}}(ξ_{2},η_{2})e^{2πix\cdot((ξ_{1},η_{1})+(ξ_{2},η_{2}))}dξdη$$ satisfies any $L^p$ estimates, where the symbol $m$ satisfies $$ |\partial_ξ^α\partial_η^βm(ξ,η)|\lesssim\frac{1}{dist(ξ,Γ_{1})^{|α|}}\cdot\frac{1}{dist(η,Γ_{2})^{|β|}} $$ for sufficiently many multi-indices $α=(α_{1},α_{2})$ and $β=(β_{1},β_{2})$, $Γ_{i}$ ($i=1,2$) are subspaces in $\mathbb{R}^{2}$ and $dim \, Γ_{1}=0, \, dim \, Γ_{2}=1$. P. Silva answered partially this question in \cite{S} and proved that $T_{m}$ maps $L^{p_1}\times L^{p_2}\rightarrow L^{p}$ boundedly when $\frac{1}{p_1}+\frac{1}{p_2}=\frac{1}{p}$ with $p_1, p_2>1$, $\frac{1}{p_1}+\frac{2}{p_2}<2$ and $\frac{1}{p_2}+\frac{2}{p_1}<2$. One observes that the admissible range here for these tuples $(p_1,p_2,p)$ is a proper subset contained in the admissible range of BHT. In this paper, we establish the same $L^{p}$ estimates as BHT in the full range for the bilinear and multi-parameter Hilbert transforms with arbitrary symbols satisfying appropriate decay assumptions (Theorem 1.3). Moreover, we also establish the same $L^p$ estimates as BHT for certain modified bilinear and bi-parameter Hilbert transforms with $dim \, Γ_{1}=dim \, Γ_{2}=1$ but with a slightly better decay than that for the bilinear and bi-parameter Hilbert transform (Theorem 1.4).
description: 37 pages
title: Capturing and Processing Born-Digital Files in the STOP AIDS Project Records:  A Case Study
Creators: name: Wilsey, Laura
name: Skirvin, Rebecca
name: Chan, Peter
name: Edwards, Glynn
Publisher: name: Utah State University
Year: 2020

description: In September 2012, the Manuscripts Division of the Stanford University Libraries Department of Special Collections and University Archives completed a one-year National Historical Publications and Records Commission (NHPRC)-funded project to process the records of the STOP AIDS Project, an HIV prevention non-profit organization in San Francisco, California. This project marked the department’s first large-scale processing project to capture and process born-digital records. Building upon the nascent framework outlined by the AIMS white paper and the infrastructure developed by Stanford University Libraries, the project team captured born-digital records and implemented new processing strategies using digital forensics tools. This case study will document the strategies and workflows employed by the project team to capture and process the born-digital component of the STOP AIDS Project records. We will describe the successes, challenges and roadblocks encountered while forensically imaging 3.5 inch floppy disks, Zip disks, and CDs using Forensic Toolkit (FTK) Imager software. We will then outline our approach to processing nearly 30,000 unique digital files captured from the computer media using AccessData Forensic Toolkit (FTK) software, discuss our current delivery strategy, and offer some concluding thoughts.
MOMO VI: Multifrequency radio variability of the blazar OJ 287 from 2015-2022, absence of predicted 2021 precursor-flare activity, and a new binary interpretation of the 2016/2017 outburst
Creators: name: Komossa, S.
name: Kraus, A.
name: Grupe, D.
name: Gonzalez, A. G.
name: Gurwell, M. A.
name: Gallo, L. C.
name: Liu, F. K.
name: Myserlis, I.
name: Krichbaum, T. P.
name: Laine, S.
name: Bach, U.
name: Gomez, J. L.
name: Parker, M. L.
name: Yao, S.
name: Berton, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Based on our dedicated Swift monitoring program, MOMO, OJ 287 is one of the best-monitored blazars in the X-ray--UV--optical regime. Here, we report results from our accompanying, dense, multi-frequency (1.4--44 GHz) radio monitoring of OJ 287 between 2015 and 2022 covering a broad range of activity states. Fermi gamma-ray observations are added. We characterize the radio flux and spectral variability in detail, including DCF and other variability analyses, and discuss its connection with the multiwavelength emission. Deep fades of radio and optical--UV fluxes are found to occur every 1--2 years. Further, it is shown that a precursor flare of thermal bremsstrahlung predicted by one of the binary supermassive black hole (SMBH) models of OJ 287 was absent. We then focus on the nature of the extraordinary, nonthermal 2016/2017 outburst that we initially discovered with Swift. We interpret it as the latest of the famous optical double-peaked outbursts of OJ 287, favoring binary scenarios that do not require a highly precessing secondary SMBH.
description: ApJ, in press. The full radio-data tables will be available in the online material of the journal. Note that in a follow-up publication (MNRAS Letters, in press), the black hole mass of OJ 287 will be revised
title: Fruits of Their Labors Digital Collection: A Case Study
Creators: name: Smart, Elizabeth
name: Young, Kristi
Publisher: name: Utah State University
Year: 2020

description: University folklore archives are expanding collections through cultural documentation projects run by students and community members. These new collections are a rich source of potential digital content. Bringing these collections online requires keeping the research audience in mind with thoughtful processing, modernizing traditional folklore archives description techniques, and working collaboratively with multiple library departments. The end results include expanded holdings and new digital resources for local historians.
title: Beyond a Box of Documents: The Collaborative Partnership Behind the Oregon Chinese Disinterment Documents Collection
Creators: name: Fernández, Natalia M
name: Paschild, Cristine N.
Publisher: name: Utah State University
Year: 2020

description: This article is a case study of a collaboration between the Oregon Multicultural Archives of Oregon State University, Portland State University Library's Special Collections, the Chinese Consolidated Benevolent Association (CCBA), and the Northwest News Network to preserve and make accessible a recovered box of Oregon Chinese disinterment documents. By examining what influenced and engaged each partner, this case study offers an opportunity to better understand the motivations of diverse stakeholders in a "post-custodial era" project that challenges traditional practices of custody, control, and access.
Challenging Journalistic Authority in the Networked Affective Dynamics of #Chemnitz
Creators: name: Makhashvili, Ana
name: Medeiros, Débora
name: Lünenborg, Margreth
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: journalistic authority
subject: legacy media
subject: affective publics
subject: social media
subject: network analysis
subject: textual analysis
subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::300 Sozialwissenschaften

description: Journalism as an institution is increasingly under pressure in hybrid media systems. Various far-right actors use social media platforms as a key staging ground for contesting legacy media. Drawing on affect theory and discursive institutionalism, this article empirically examines how journalistic authority was challenged on Twitter during far-right riots in the German city of Chemnitz in 2018. Through these public and networked contestations, we see the emergence of “affective publics” that form around shared and competing emotions. Through social network analysis, we examine the networked polarization around #Chemnitz. By applying in-depth textual analysis, we then untangle how far-right actors attack legacy media by strategically mobilizing and performing outrage. Based on our findings, we propose to understand journalism as an affective institution, whose authority is perpetually contested as affective publics gain agency. Such an understanding involves a profound questioning of the notion of objectivity that has been constitutive of journalism in the 20th century.
Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
Creators: name: Komossa, S.
name: Grupe, D.
name: Kraus, A.
name: Gurwell, M. A.
name: Haiman, Z.
name: Liu, F. K.
name: Tchekhovskoy, A.
name: Gallo, L. C.
name: Berton, M.
name: Blandford, R.
name: Gomez, J. L.
name: Gonzalez, A. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The project MOMO (Multiwavelength Observations and Modelling of OJ 287) was set up to test predictions of binary supermassive black hole (SMBH) scenarios and to understand disk-jet physics of the blazar OJ 287. After a correction, the precessing binary (PB) SMBH model predicted the next main outburst of OJ 287 in 2022 October, no longer in July, making the outburst well observable and the model testable. We have densely covered this period in our ongoing multi-frequency radio, optical, UV, and X-ray monitoring. The predicted outburst was not detected. Instead, OJ 287 was at low optical-UV emission levels, declining further into November. The predicted thermal bremsstrahlung spectrum was not observed either, at any epoch. Further, applying scaling relations, we estimate a SMBH mass of OJ 287 of 10^8 M_sun. The latest in a sequence of deep low-states that recur every 1-2 yrs is used to determine an upper limit on the Eddington ratio and on the accretion-disk luminosity. This limit is at least a factor of 10 lower than required by the PB model with its massive primary SMBH of >10^{10} M_sun. All these results favor alternative binary SMBH models of OJ 287 that neither require strong orbital precession nor a very large mass of the primary SMBH.
description: MNRAS Letter, in press
Attachment and complicated grief: A retrospective study
Creators: name: Pallini, Susanna
name: Marella, Daniela
name: Bove, Giuseppe
name: Saija, Edoardo
name: Laghi, Fiorenzo
name: Barcaccia, Barbara
Publisher: name: Psychology Hub
Year: 2023

description: The perception of the caregiver as a haven of safety in painful times is crucial for the development of a secure attachment style. The goal of this study is to retrospectively investigate the association of recalled emotional closeness to parents at the time of loss (REC) and how the news of loss was broken (HOW) with adult Complicated Grief and attachment style in 273 adults who lost a beloved person in childhood, using inventories of Complicated Grief and Parent and Peer Attachment, REC scale and an open-ended questionnaire on the circumstances of death. Data evidenced that REC and HOW scores in the experience of loss in childhood predicted less complicated grief and more secure attachment in the present.
description: Psychology Hub, Vol. 40 No. 2 (2023)
The evolving spectrum of the planetary nebula Hen 2-260
Creators: name: Hajduk, M.
name: van Hoof, P. A. M.
name: Gesicki, K.
name: Zijlstra, A. A.
name: Górny, S. K.
name: Gładkowski, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analysed the planetary nebula Hen 2-260 using optical spectroscopy and photometry. We compared our observations with the data from literature to search for evolutionary changes. The nebular line fluxes were modelled with the Cloudy photoionization code to derive the stellar and nebular parameters. The planetary nebula shows a complex structure and possibly a bipolar outflow. The nebula is relatively dense and young. The central star is just starting $\rm O^+$ ionization ($\rm T_{eff} \approx 30,000 \, K$). Comparison of our observations with literature data indicates a 50% increase of the [OIII] 5007 Å line flux between 2001 and 2012. We interpret it as the result of the progression of the ionization of $\rm O^{+}$. The central star evolves to higher temperatures at a rate of $\rm 45 \pm 7\,K\, yr^{-1}$. The heating rate is consistent with a final mass of $\rm 0.626 ^{+0.003}_{-0.005} \, M_{\odot}$ or $\rm 0.645 ^{+0.008}_{-0.008} \, M_{\odot}$ for two different sets of post-AGB evolutionary tracks from literature. The photometric monitoring of Hen 2-260 revealed variations on a timescale of hours or days. The variability may be caused by pulsations of the star. The temperature evolution of the central star can be traced using spectroscopic observations of the surrounding planetary nebula spanning a timescale of roughly a decade. This allows us to precisely determine the stellar mass, since the pace of the temperature evolution depends critically on the core mass. The kinematical age of the nebula is consistent with the age obtained from the evolutionary track. The final mass of the central star is close to the mass distribution peak for central stars of planetary nebulae found in other studies. The object belongs to a group of young central stars of planetary nebulae showing photometric variability.
description: accepted for publication in A&A
Incremental Clustering and Expansion for Faster Optimal Planning in Dec-POMDPs
Creators: name: Oliehoek, Frans Adriaan
name: Spaan, Matthijs T. J.
name: Amato, Christopher
name: Whiteson, Shimon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This article presents the state-of-the-art in optimal solution methods for decentralized partially observable Markov decision processes (Dec-POMDPs), which are general models for collaborative multiagent planning under uncertainty. Building off the generalized multiagent A* (GMAA*) algorithm, which reduces the problem to a tree of one-shot collaborative Bayesian games (CBGs), we describe several advances that greatly expand the range of Dec-POMDPs that can be solved optimally. First, we introduce lossless incremental clustering of the CBGs solved by GMAA*, which achieves exponential speedups without sacrificing optimality. Second, we introduce incremental expansion of nodes in the GMAA* search tree, which avoids the need to expand all children, the number of which is in the worst case doubly exponential in the nodes depth. This is particularly beneficial when little clustering is possible. In addition, we introduce new hybrid heuristic representations that are more compact and thereby enable the solution of larger Dec-POMDPs. We provide theoretical guarantees that, when a suitable heuristic is used, both incremental clustering and incremental expansion yield algorithms that are both complete and search equivalent. Finally, we present extensive empirical results demonstrating that GMAA*-ICE, an algorithm that synthesizes these advances, can optimally solve Dec-POMDPs of unprecedented size.
Quantification of the Writhe Number Evolution of Solar Filament Axes
Creators: name: Zhou, Zhenjun
name: Jiang, Chaowei
name: Song, Hongqiang
name: Wang, Yuming
name: Hao, Yongqiang
name: Cui, Jun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Solar filament eruptions often show complex and dramatic geometric deformation that is highly relevant to the underlying physical mechanism triggering the eruptions. It has been well known that the writhe of filament axes is a key parameter characterizing its global geometric deformation, but a quantitative investigation of the development of writhe during its eruption is still lacking. Here we introduce the Writhe Application Toolkit (WAT) which can be used to characterize accurately the topology of filament axes. This characterization is achieved based on the reconstruction and writhe number computation of three-dimensional paths of the filament axes from dual-perspective observations. We apply this toolkit to four dextral filaments located in the northern hemisphere with a counterclockwise (CCW) rotation during their eruptions. Initially, all these filaments possess a small writhe number (=<0.20) indicating a weak helical deformation of the axes. As the CCW rotation kicks in, their writhe numbers begin to decrease and reach large negative values. Combined with the extended Călugăreanu theorem, the absolute value of twist is deduced to decrease during the rotation. Such a quantitative analysis strongly indicates a consequence of the conversion of twist into writhe for the studied events.