cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
AVscript: Accessible Video Editing with Audio-Visual Scripts
Creators: name: Huh, Mina
name: Yang, Saelyne
name: Peng, Yi-Hao
name: Chen, Xiang 'Anthony'
name: Kim, Young-Ho
name: Pavel, Amy
Publisher: name: arXiv
Year: 2023
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Sighted and blind and low vision (BLV) creators alike use videos to communicate with broad audiences. Yet, video editing remains inaccessible to BLV creators. Our formative study revealed that current video editing tools make it difficult to access the visual content, assess the visual quality, and efficiently navigate the timeline. We present AVscript, an accessible text-based video editor. AVscript enables BLV creators to edit their video using a script that embeds the video's visual content, visual errors (e.g., dark or blurred footage), and speech. BLV creators can use AVscript to efficiently navigate between scenes and visual errors or to locate objects in the frame or spoken words of interest. A comparison study (N=12) showed that AVscript significantly lowered BLV creators' mental demands while increasing confidence and independence in video editing. We further demonstrate the potential of AVscript through an exploratory study (N=3) where BLV creators edited their own footage.
description: CHI 2023
Matrix roots of imprimitive irreducible nonnegative matrices
Creators: name: McDonald, Judith J.
name: Paparella, Pietro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 15A16, 15B48, 15A21

description: Using matrix function theory, Perron-Frobenius theory, combinatorial matrix theory, and elementary number theory, we characterize, classify, and describe in terms of the Jordan canonical form the matrix pth-roots of imprimitive irreducible nonnegative matrices. Preliminary results concerning the matrix roots of reducible matrices are provided as well.
description: To appear in Linear Algebra and its Applications
Small ball estimates for quasi-norms
Creators: name: Friedland, Omer
name: Giladi, Ohad
name: Guédon, Olivier
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: This note contains two types of small ball estimates for random vectors in finite dimensional spaces equipped with a quasi-norm. In the first part, we obtain bounds for the small ball probability of random vectors under some smoothness assumptions on their density function. In the second part, we obtain Littlewood-Offord type estimates for quasi-norms. This generalizes a result which was previously obtained by Friedland and Sodin and by Rudelson and Vershynin.
description: Minor corrections. To appear in J Theor Probab
K-Knuth Equivalence for Increasing Tableaux
Creators: name: Gaetz, Christian
name: Mastrianni, Michelle
name: Patrias, Rebecca
name: Peck, Hailee
name: Robichaux, Colleen
name: Schwein, David
name: Tam, Ka Yu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: A K-theoretic analogue of RSK insertion and Knuth equivalence relations was first introduced in 2006 by Buch, Kresch, Shimozono, Tamvakis, and Yong. The resulting K-Knuth equivalence relations on words and increasing tableaux on [n] has prompted investigation into the equivalence classes of tableaux arising from these relations. Of particular interest are the tableaux that are unique in their class, which we refer to as unique rectification targets (URTs). In this paper we give several new families of URTs and a bound on the length of intermediate words connecting two K-Knuth equivalent words. In addition, we describe an algorithm to determine if two words are K-Knuth equivalent and to compute all K-Knuth equivalence classes of tableaux on [n].
description: 35 pages
Constraining Scale Dependent Growth with Redshift Surveys
Creators: name: Denissenya, Mikhail
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Ongoing and future redshift surveys have the capability to measure the growth rate of large scale structure at the percent level over a broad range of redshifts, tightly constraining cosmological parameters. Beyond general relativity, however, the growth rate in the linear density perturbation regime can be not only redshift dependent but scale dependent, revealing important clues to modified gravity. We demonstrate that a fully model independent approach of binning the gravitational strength $G_{\rm eff}(k,z)$ matches scalar-tensor results for the growth rate $fσ_8(k,z)$ to $0.02\%$-$0.27\%$ rms accuracy. For data of the quality of the Dark Energy Spectroscopic Instrument (DESI) we find the bin values can be constrained to 1.4\%-28\%. We also explore the general scalar-tensor form, constraining the amplitude and past and future scalaron mass/shape parameters. Perhaps most interesting is the strong complementarity of low redshift peculiar velocity data with DESI-like redshift space distortion measurements, enabling improvements up to a factor 6-7 on 2D joint confidence contour areas. Finally, we quantify some issues with gravity parametrizations that do not include all the key physics.
description: 12 pages, 8 figures; v2 minor edits to match published version
Heuristics for designing user‐centric drug products: Lessons learned from Human Factors and Ergonomics
Creators: name: Feufel, Markus A.
name: Rauwolf, Gudrun
name: Meier, Felix C.
name: Karapinar‐Çarkit, Fatma
name: Heibges, Maren
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 610 Medizin und Gesundheit
subject: consumer health information
subject: drug design and labelling
subject: ergonomics
subject: human engineering
subject: medication errors
subject: patient safety
subject: patient‐centric design
subject: self‐administration
subject: user‐centric design

description: Even the most effective drug product may be used improperly and thus ultimately prove ineffective if it does not meet the perceptual, motor and cognitive capacities of its target users. Currently, no comprehensive guideline for systematically designing user‐centric drug products that would help prevent such limitations exists. We have compiled a list of approximate but nonetheless useful strategies—heuristics—for implementing a user‐centric design of drug products and drug product portfolios. First, we present a general heuristic for user‐centric design based on the framework of Human Factors and Ergonomics (HF/E). Then we demonstrate how to implement this general heuristic for older drug users (i.e., patients and caregivers aged 65 years and older) and with respect to three specific challenges (use‐cases) of medication management: (A) knowing what drug product to take/administer, (B) knowing how and when to take/administer it, and (C) actually taking/administering it. The presented heuristics can be applied prospectively to include existing knowledge about user‐centric design at every step during drug discovery, pharmaceutical drug development, and pre‐clinical and clinical trials. After a product has been released to the market, the heuristics may guide a retrospective analysis of medication errors and barriers to product usage as a basis for iteratively optimizing both the drug product and its portfolio over their life cycle.
Leveraging Angular Distributions for Improved Knowledge Distillation
Creators: name: Jeon, Eun Som
name: Choi, Hongjun
name: Shukla, Ankita
name: Turaga, Pavan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Knowledge distillation as a broad class of methods has led to the development of lightweight and memory efficient models, using a pre-trained model with a large capacity (teacher network) to train a smaller model (student network). Recently, additional variations for knowledge distillation, utilizing activation maps of intermediate layers as the source of knowledge, have been studied. Generally, in computer vision applications, it is seen that the feature activation learned by a higher capacity model contains richer knowledge, highlighting complete objects while focusing less on the background. Based on this observation, we leverage the dual ability of the teacher to accurately distinguish between positive (relevant to the target object) and negative (irrelevant) areas. We propose a new loss function for distillation, called angular margin-based distillation (AMD) loss. AMD loss uses the angular distance between positive and negative features by projecting them onto a hypersphere, motivated by the near angular distributions seen in many feature extractors. Then, we create a more attentive feature that is angularly distributed on the hypersphere by introducing an angular margin to the positive feature. Transferring such knowledge from the teacher network enables the student model to harness the higher discrimination of positive and negative features for the teacher, thus distilling superior student models. The proposed method is evaluated for various student-teacher network pairs on four public datasets. Furthermore, we show that the proposed method has advantages in compatibility with other learning techniques, such as using fine-grained features, augmentation, and other distillation methods.
description: Neurocomputing, Volume 518, 21 January 2023, Pages 466-481
Abundance of 3-planes on real projective hypersurfaces
Creators: name: Finashin, Sergey
name: Kharlamov, Viatcheslav
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N15, 14P25, 14J70

description: We show that a generic real projective $n$-dimensional hypersurface of odd degree $d$, such that $4(n-2)=\binom{d+3}3$, contains "many" real 3-planes, namely, in the logarithmic scale their number has the same rate of growth, $d^3\log d$, as the number of complex 3-planes. This estimate is based on the interpretation of a suitable signed count of the 3-planes as the Euler number of an appropriate bundle.
description: 25 pages, minor typos corrected after proofreading
Trusted systems of records based on Blockchain technology ‐ a prototype for mileage storing in the automotive industry
Creators: name: Preikschat, Katarina
name: Böhmecke‐Schwafert, Moritz
name: Buchwald, Jan‐Paul
name: Stickel, Carolin
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 004 Datenverarbeitung; Informatik
subject: blockchain
subject: decentralized application
subject: ethereum
subject: internet of things
subject: mileage
subject: system of records
subject: trust

description: Blockchain technology has the potential to bring transparency and trust to a multitude of use cases. Our research demonstrates that the technology can reduce asymmetric information in markets by bridging trust gaps. The combination of blockchain and Internet of Things technology that automatically collects sensor data, provides a feasible, decentralized technological solution for such an inefficient “Market of Lemons” coined by nobel laureate Georg Akerlof. In this paper, we develop a system prototype to reduce mileage fraud on the used car markets. Our work demonstrates the feasibility of a trusted system of records for (vehicle) data such as mileage data using a distributed database based on the public Ethereum network and smart contracts. We have identified eight requirements that are fulfilled by the prototype and the functional logic and design of thesolution can be reproduced to any other application area characterized by a lack of trust between actors or by the absence of a trusted central authority. However, the developed prototype suffers from similar limitations and challenges as the technology itself. Low throughput causes limitations in scalability and transaction costs are unpredictable. Further development of the blockchain technology and considering more cost‐efficient consensus mechanisms will address these issues.
Truncated accretion discs in black hole X-ray binaries: dynamics and variability signatures
Creators: name: Dihingia, Indu K.
name: Vaidya, Bhargav
name: Fendt, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Variable features in black hole X-ray Binaries (BH-XRBs) are observed in different energy ranges and time scales. The physical origin of different spectral states in BH-XRBs and their relations with the underlying accretion disc are still elusive. To investigate the intermediate state of BH-XRBs during outburst, we simulate a truncated accretion disc around a Kerr black hole using a general relativistic magneto-hydrodynamical (GRMHD) framework under axisymmetry with adaptively refined mesh. Additionally, we have also carried out radiative transfer calculations for understanding the implications of disc dynamics on emission. Dynamically, the inner edge of the truncated accretion disc oscillates in a quasi-periodic fashion (QPO). The QPO frequency of oscillations $(ν_{\rm QPO, max})$ increases as the magnetic field strength and magnetic resistivity increase. However, as the truncation radius increases, $ν_{\rm QPO, max}$ decreases. In our simulation models, frequency varies between $7\times(10M_{\odot}/M_{\rm BH})$ Hz $\lesssimν_{\rm QPO, max}\lesssim20 \times (10M_{\odot}/M_{\rm BH})$ Hz, which is in the range of low-frequency QPOs. We further find evidence of transient shocks in the highly accreting stage during oscillation. Such a transient shock acts as an extended hot post-shock corona around the black hole that has an impact on its radiative properties. The radiative transfer calculations show signatures of these oscillations in the form of modulation in the edge-brightened structure of the accretion disc.
description: 18 pages, 24 figures, accepted for publication in MNRAS, Arxiv version is same as the published version
Toward optimal cluster power spectrum analysis
Creators: name: Smith, Robert E.
name: Marian, Laura
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The power spectrum of galaxy clusters is an important probe of the cosmological model. In this paper we determine the optimal weighting scheme for maximizing the signal-to-noise ratio for such measurements. We find a closed form analytic expression for the optimal weights. Our expression takes into account: cluster mass, finite survey volume effects, survey masking, and a flux limit. The implementation of this weighting scheme requires knowledge of the measured cluster masses, and analytic models for the bias and space-density of clusters as a function of mass and redshift. Recent studies have suggested that the optimal method for reconstruction of the matter density field from a set of clusters is mass-weighting (Seljak et al 2009, Hamaus et al 2010, Cai et al 2011). We compare our optimal weighting scheme with this approach and also with the original power spectrum scheme of Feldman et al (1994). We show that our optimal weighting scheme outperforms these approaches for both volume- and flux-limited cluster surveys. Finally, we present a new expression for the Fisher information matrix for cluster power spectrum analysis. Our expression shows that for an optimally weighted cluster survey the cosmological information content is boosted, relative to the standard approach of Tegmark (1997).
description: Significantly shortened: 20 pages; 3 figures
title: Αστικές, τοπιακές και αντιληπτικές συρραφές - αφηγήσεις σε ένα σύγχρονο πεδίο θραυσμάτων γύρω από την πλατεία Αγίων Ασωμάτων στο Θησείο και ο επαναπροσδιορισμός του δημοσίου χώρου και νοημάτων
title: Urban, landscape and perceptual stiching - Narratives in a contemporary field of fragments around the Asomaton square in Thisio and the redefinning public space and meanings
Creators: name: Ζυγογιαννη Αθηνα
Publisher: name: Technical University of Crete
Year: 2023

description: Η σύγχρονη ταυτότητα του κέντρου της Αθήνας περιγράφεται από μια συνένωση και
διαπλοκή αποσπασμάτων διαφορετικού χαρακτήρα και ατμόσφαιρας συνοικιών. O
κατακερματισμός της σύγχρονης πόλης δημιουργεί ένα συνονθύλευμα θραυσμάτων και ετερογενών στοιχείων. Πιο συγκεκριμένα, η περιοχή μελέτης της παρούσας διπλωματικής χωροθετείται γύρω από την πλατεία Αγίων Ασωμάτων, στο σταθμό του Θησείου. Επιπλέον, η περιοχή μελέτης εκτείνεται κατά μήκος του τόξου των σιδηροδρομικών γραμμών του Θησείου. Όριο αλλά και πύλη της περιοχής μελέτης αποτελεί ο κεντρικός άξονας της οδού Πειραιώς. Η δυναμική της συμπλοκής αυτών των ποιοτήτων κάθε αποσπάσματος" εγείρει τον προβληματισμό γύρω από τις σχέσεις μεταξύ τους και πώς ορίζουν ένα σύγχρονο πεδίο θραυσμάτων στην περιοχή αυτή. Η παρούσα διπλωματική, μέσω της ανάγνωσης αυτών των ποιοτήτων και καταστάσεων που τις διακρίνουν, προτείνει νέες αφηγήσεις αλληλουχιών και συρραφών των θραυσμάτων συντακτικά, εννοιολογικά και αντιληπτικά.
Πιο συγκεκριμένα, επαναπροσδιορίζεται ο δημόσιος χώρος της πλατείας των Αγίων
Ασωματων και η σύνταξη των οικοδομικών τετραγώνων που την οριοθετούν,
δημιουργώντας νέα μέτωπα υποβαθμισμένα που θα παραλαμβάνουν τους εμπορικούς
άξονες διαχέοντας τους σε έναν ενοποιημένο δημόσιο χώρο. Στη συνέχεια, ο ενιαίος αυτός, λοιπόν, δημόσιος χώρος προεκτείνεται με τις αφηγήσεις διαδρομών που υπογραμμίζουν το τόξο των σιδηρογραμμών. Τέλος, αυτές οι διαδρομές διαφορετικού χαρακτήρα συνδέονται με ένα σύστημα εγκάρσιων γεφυρώσεων με στόχο την προσέγγιση της συνοικίας του Θησείου με το πάρκο και τον αρχαιολογικό χώρο του Κεραμεικού.
Joint modelling of repeated multivariate cognitive measures and competing risks of dementia and death: a latent process and latent class approach
Creators: name: Proust-Lima, Cécile
name: Dartigues, Jean-François
name: Jacqmin-Gadda, Hélène
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Joint models initially dedicated to a single longitudinal marker and a single time-to-event need to be extended to account for the rich longitudinal data of cohort studies. Multiple causes of clinical progression are indeed usually observed, and multiple longitudinal markers are collected when the true latent trait of interest is hard to capture (e.g. quality of life, functional dependency, cognitive level). These multivariate and longitudinal data also usually have nonstandard distributions (discrete, asymmetric, bounded,...). We propose a joint model based on a latent process and latent classes to analyze simultaneously such multiple longitudinal markers of different natures, and multiple causes of progression. A latent process model describes the latent trait of interest and links it to the observed longitudinal outcomes using flexible measurement models adapted to different types of data, and a latent class structure links the longitudinal and the cause-specific survival models. The joint model is estimated in the maximum likelihood framework. A score test is developed to evaluate the assumption of conditional independence of the longitudinal markers and each cause of progression given the latent classes. In addition, individual dynamic cumulative incidences of each cause of progression based on the repeated marker data are derived. The methodology is validated in a simulation study and applied on real data about cognitive aging coming from a large population-based study. The aim is to predict the risk of dementia by accounting for the competing death according to the profiles of semantic memory measured by two asymmetric psychometric tests.
Circumplanetary disk ices. I. Ice formation vs. viscous evolution and grain drift
Creators: name: Oberg, Nickolas
name: Kamp, Inga
name: Cazaux, Stephanie
name: Woitke, Peter
name: Thi, Wing-Fai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The large icy moons of Jupiter formed in a circumplanetary disk (CPD). CPDs are fed by infalling circumstellar gas and dust which may be shock-heated upon accretion or sublimated while passing through an optically thin gap. Accreted material is then either incorporated into moons, falls into the planet, or is lost beyond the disk edge on relatively short timescales. If ices are sublimated during accretion onto the CPD we know there must be sufficient time for them to recondense or moons such as Ganymede or Callisto could not form. The chemical timescale to form sufficiently icy solids places a novel constraint on the dynamical behaviour and properties of CPDs. We use the radiation thermochemical code ProDiMo to analyze how the radial ice abundance evolves in CPDs. We consider different initial chemical conditions of the disk to explore the consequences of infalling material being inherited from the circumstellar disk or being reset to atomic conditions by shock-heating. We contrast the timescales of ice formation with those of viscous evolution and radial dust drift. Water ice can form very efficiently in the CPD from initially atomic conditions, as a significant fraction is efficiently re-deposited on dust grains within < 1 yr. Radial grain drift timescales are in general longer than those of ice formation on grains. Icy grains of size $a < 3$ mm retain their icy mantles while crossing an optically thin circumstellar disk gap at 5 au for $L_* < 10 $ L$_{\odot}$. Three-body reactions play an important role in water formation in the dense midplane condition of CPDs. The CPD midplane must be depleted in dust relative to the circumstellar disk by a factor 10-50 to produce solids with the ice to rock ratio of the icy Galilean satellites. The CPD snowline is not erased by radial grain drift, which is consistent with the compositional gradient of the Galilean satellites being primordial.
description: 20 pages, 17 figures
title: ProQuest-UMETRICS Linkage Documentation
Creators: name: VanEseltine, Matthew
name: Nicholls, Natsuko
name: Ku, Raphael Lesmond
name: Owen-Smith, Jason
Publisher: name: Institute for Research on Innovation and Science (IRIS)
Year: 2019

description: This is publicly available documentation on the UMETRICS-ProQuest crosswalk file that was released in July 2019 as a supplement to the 2019 IRIS data release.
Performance Engineering of the Kernel Polynomial Method on Large-Scale CPU-GPU Systems
Creators: name: Kreutzer, Moritz
name: Hager, Georg
name: Wellein, Gerhard
name: Pieper, Andreas
name: Alvermann, Andreas
name: Fehske, Holger
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Performance (cs.PF)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The Kernel Polynomial Method (KPM) is a well-established scheme in quantum physics and quantum chemistry to determine the eigenvalue density and spectral properties of large sparse matrices. In this work we demonstrate the high optimization potential and feasibility of peta-scale heterogeneous CPU-GPU implementations of the KPM. At the node level we show that it is possible to decouple the sparse matrix problem posed by KPM from main memory bandwidth both on CPU and GPU. To alleviate the effects of scattered data access we combine loosely coupled outer iterations with tightly coupled block sparse matrix multiple vector operations, which enables pure data streaming. All optimizations are guided by a performance analysis and modelling process that indicates how the computational bottlenecks change with each optimization step. Finally we use the optimized node-level KPM with a hybrid-parallel framework to perform large scale heterogeneous electronic structure calculations for novel topological materials on a petascale-class Cray XC30 system.
description: 10 pages, 12 figures
Evaluation of the potential of a gamma-ray observatory to detect astrophysical neutrinos through inclined showers
Creators: name: Alvarez-Muñiz, Jaime
name: Conceição, Ruben
name: Costa, Pedro J.
name: Pimenta, Mário
name: Tomé, Bernardo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We assess the capabilities of a ground-based gamma-ray observatory to detect astrophysical neutrinos with energies in the $100\,{\rm TeV}$ to $100\,{\rm PeV}$ range. The identification of these events would be done through the measurement of very inclined extensive air showers induced by downward-going and upward-going neutrinos. The discrimination of neutrino-induced showers in the overwhelming cosmic-ray background is achieved by analysing the balance of the total electromagnetic and muonic signals of the shower at the ground. We demonstrate that a ${\rm km^2}$-scale wide field-of-view ground-based gamma-ray observatory could detect a couple of Very-High to Ultra-High energy (VHE-UHE) neutrino events per year with a reasonable pointing accuracy, making it an interesting facility for multi-messenger studies with both photons and neutrinos.
description: 12 pages, 14 figures, accepted in Phys.Rev.D
Obituary data VN Q3 Q4 2022 and Stata code
Creators: name: Mayer, Susanne
name: Oberndorfer, Moritz
Publisher: name: Zenodo
Year: 2023

description: Anonymized data extracted from obituaries published in Vorarlberger Nachrichten (online), 01/07/2022 - 31/12/2022 (Susanne Mayer), and Stata code (do file) used to run all analyses (Susanne Mayer, Moritz Oberndorfer).
Low-level accretion in neutron-star X-ray binaries
Creators: name: Wijnands, R.
name: Degenaar, N.
name: Padilla, M. Armas
name: Altamirano, D.
name: Cavecchi, Y.
name: Linares, M.
name: Bahramian, A.
name: Heinke, C. O.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We search the literature for reports on the spectral properties of neutron-star low-mass X-ray binaries when they have accretion luminosities between 1E34 and 1E36 ergs/s. We found that in this luminosity range the photon index (obtained from fitting a simple absorbed power-law in the 0.5-10 keV range) increases with decreasing 0.5-10 keV X-ray luminosity (i.e., the spectrum softens). Such behaviour has been reported before for individual sources, but here we demonstrate that very likely most (if not all) neutron-star systems behave in a similar manner and possibly even follow a universal relation. When comparing the neutron-star systems with black-hole systems, it is clear that most black-hole binaries have significantly harder spectra at luminosities of 1E34 - 1E35 erg/s. Despite a limited number of data points, there are indications that these spectral differences also extend to the 1E35 - 1E36 erg/s range. This observed difference between the neutron-star binaries and black-hole ones suggests that the spectral properties (between 0.5-10 keV) at 1E34 - 1E35 erg/s can be used to tentatively determine the nature of the accretor in unclassified X-ray binaries. We discuss our results in the context of properties of the accretion flow at low luminosities and we suggest that the observed spectral differences likely arise from the neutron-star surface becoming dominantly visible in the X-ray spectra. We also suggest that both the thermal component and the non-thermal component might be caused by low-level accretion onto the neutron-star surface for luminosities below a few times 1E34 erg/s.
description: Accepted for publication in MNRAS
Linking star formation thresholds and truncations in the thin and thick disks of the low-mass galaxy UGC 7321
Creators: name: Díaz-García, Simón
name: Comerón, Sébastien
name: Courteau, Stéphane
name: Watkins, Aaron E.
name: Knapen, Johan H.
name: Román, Javier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Thin and thick disks are found in most spiral galaxies, yet their formation scenarios remain uncertain. Whether thick disks form through slow or fast, internal or environmental, processes is unclear. The physical origin of outer truncations in thin and thick disks, observed as a drop in optical and near-infrared (NIR) surface brightness profiles, is also a much debated topic. These truncations have been linked to star formation (SF) thresholds in Milky-Way type galaxies, but no such connection has been made for their low-mass counterparts or in thick disks. Our photometric analysis of the edge-on galaxy UGC 7321 offers a possible breakthrough. This well-studied diffuse, isolated, bulgeless, ultra-thin galaxy is thought to be under-evolved both dynamically and in SF. It is an ideal target to disentangle internal effects in the formation of thick disks and truncations. Our axial light profiles from deep far- and near-ultraviolet (UV; GALEX) images, tracing recent SF, and optical (DESI grz) and NIR (Spitzer 3.6 microns) images, tracing old stellar populations, enable a detailed identification of an outer truncation in all probed wavelengths in both the thin and thick disks. After deprojecting to a face-on view, a sharp truncation signature is found at a stellar density of roughly 1.5 solar masses per square parsec, in agreement with theoretical expectations of gas density SF thresholds. The redder colours beyond the truncation radius are indicative of stellar migration towards the outer regions. We thus show that thick disks and truncations can form via internal mechanisms alone, given the pristine nature of UGC 7321. We report the discovery of a truncation at and above the mid-plane of a diffuse galaxy that is linked to a SF threshold; this poses a constraint on physically-motivated disk size measurements among low-mass galaxies.
description: Accepted for publication in A&A (August 29, 2022). 7 pages, 3 figures
title: IRIS UMETRICS 2022 Linkage Files
Creators: name: Institute for Research on Innovation and Science (IRIS)
Publisher: name: Institute for Research on Innovation and Science (IRIS)
Year: 2022

description: The IRIS UMETRICS 2022 Data Release linkage files include crosswalks between IRIS data and external datasets (e.g., federal award and publication data) at the award level. The improved award match rate (in both NSF and NIH award linkage) reflects our continuous effort to minimize false positives and false negatives. As indicated above, we expanded award linkage from award to individual level this year by linking UMETRICS employee name and NSF / NIH Primary Investigator (PI) names. Based on individual name matching, we developed two team-focused data files that can be useful in addressing research questions concerning team characteristics (such as diversity) and their impact on research performance and productivity if team files are linked to Core files.
Higher Poincare Lemma and Integrability
Creators: name: Demessie, Getachew Alemu
name: Saemann, Christian
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove the non-abelian Poincare lemma in higher gauge theory in two different ways. The first method uses a result by Jacobowitz which states solvability conditions for differential equations of a certain type. The second method extends a proof by Voronov and yields the explicit gauge parameters connecting a flat local connective structure to the trivial one. Finally, we show how higher flatness appears as a necessary integrability condition of a linear system which featured in recently developed twistor descriptions of higher gauge theories.
description: 1+21 pages, presentation streamlined, section on integrability for higher linear systems significantly improved, published version
Effect of mobility on synchronization of nonlocally coupled oscillators with a phase lag
Creators: name: Li, Bojun
name: Uchida, Nariya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Nonlocally coupled oscillators with a phase lag self-organize into various patterns such as global synchronization, the twisted state, and the chimera state. In this paper, we consider nonlocally coupled oscillators that move on a ring by randomly exchanging their positions with the neighbors, and investigate the combined effects of phase lag and mobility on the collective phase dynamics. Spanning the whole range of phase lag and mobility, we show that mobility promotes synchronization for an attractive coupling, while it destroys coherence for a repulsive coupling. The transition behaviors are discussed in terms of the timescales of synchronization and diffusion of the oscillators. We also find a novel spatiotemporal pattern at the border between coherent and incoherent states.
description: 7 pages, 8 figures
First-order phase transition in the framework of the cell fluid model: Regions of chemical potential variation and the corresponding densities
Creators: name: Pylyuk, I. V.
name: Kozlovskii, M. P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A microscopic description is given for the behavior of the fluid system in an immediate vicinity of its critical point, where theoretical and experimental researches are difficult to carry out. For the temperatures $T
description: 16 pages, 5 figures
Steady quantum coherence in non-equilibrium environment
Creators: name: Li, Sheng-Wen
name: Cai, C. Y.
name: Sun, C. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the steady state of a three-level system in contact with a non-equilibrium environment, which is composed of two independent heat baths at different temperatures. We derive a master equation to describe the non-equilibrium process of the system. For the three level systems with two dipole transitions, i.e., the $Λ$-type and V-type, we find that the interferences of two transitions in a non-equilibrium environment can give rise to non-vanishing steady quantum coherence, namely, there exist non-zero off-diagonal terms in the steady state density matrix (in the energy representation). Moreover, the non-vanishing off-diagonal terms increase with the temperature difference of the two heat baths. Such interferences of the transitions were usually omitted by secular approximation, for it was usually believed that they only take effect in short time behavior and do not affect the steady state. Here we show that, in non-equilibrium systems, such omission would lead to the neglect of the steady quantum coherence.
description: 15 pages, 5 figures
Influence of Brushing force on Abrasive wear of Teeth
Creators: name: Ramadan, Mohammed
Publisher: name: figshare
Year: 2020
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering
subject: 91309 Tribology

description: The present work aims to study the effect of the brushing force on the mechanical wear of teeth during polishing. Teeth specimens were brushed using three different types of tooth pastes. Tooth paste A contained pumice of (30 – 40) μm particle size. Paste B contained 8 wt % of hydrated silica abrasive of (10 – 12) μm particle size. Type C paste is an abrasive-free paste. The abrasives used were standard Arizona sand (ACFTD) of 0 - 80 μm and (ACCTD) of 0 - 200 μm particle size. Alumina particles of (1 - 3 μm) and sand with particle sizes of (11 – 13 μm, 15 – 20 μm, 20 – 24 μm, 28 – 32 μm and 42 – 52 μm) were used to fabricate eight different pastes. The abrasives were added at a 10 wt. % concentration. The brushing speed used in the experiments was 150 strokes/min. The contact forces used were 3 and 5 N in the presence of water. Based on the observations in the present work, it was found that the influence of the force on the abrasive wear of the teeth increased with increasing abrasive particle size. The most pronounced influence was displayed by paste A that contaminated by abrasive of 30 – 40 μm particle size. Paste B displayed slight wear increase with increasing the acting load. Besides, abrasives of wide range of particle sizes such as air cleaner fine test dust (0 – 80 μm) and air cleaner coarse test dust (0 – 200 μm) showed lower wear than paste A. In condition of adhesion, significant wear increase was observed for paste-free abrasives. When adding abrasive to tooth paste, it is recommended to avoid the abrasive particle sizes ranging from 20 - 50 μm to reduce the excessive abrasive wear occurred during polishing the teeth.
Constraining Europa's subsolar atmosphere with a joint analysis of HST spectral images and Galileo magnetic field data
Creators: name: Cervantes, Sebastian
name: Saur, Joachim
Publisher: name: arXiv
Year: 2022
Subjects: subject: Space Physics (physics.space-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We constrain Europa's tenuous atmosphere on the subsolar hemisphere by combining two sets of observations: oxygen emissions at 1304 Å and 1356 Å from Hubble Space Telescope (HST) spectral images, and Galileo magnetic field measurements from its closest encounter, the E12 flyby. We describe Europa's atmosphere with three neutral gas species: global molecular ($\mathrm{O_2}$) and atomic oxygen (O), and localized water ($\mathrm{H_2O}$) present as a near-equatorial plume and as a stable distribution concentrated around the subsolar point on the moon's trailing hemisphere. Our combined modelling based on the ratio of OI 1356 Å to OI 1304 Å emissions from Roth (2021) and on magnetic field data allows us to derive constraints on the density and location of $\mathrm{O_2}$ and $\mathrm{H_2O}$ in Europa's atmosphere. We demonstrate that $50\%$ of the $\mathrm{O_2}$ and between $50\%$ and $75\%$ of the $\mathrm{H_2O}$ abundances from Roth (2021) are required to jointly explain the HST and Galileo measurements. These values are conditioned on a column density of $\mathrm{O}$ close to the upper limit of $6 \times10^{16}~\mathrm{m}^{-2}$ derived by Roth (2021), and on a strongly confined stable $\mathrm{H_2O}$ atmosphere around the subsolar point. Our analysis yields column densities of $1.2 \times10^{18}~\mathrm{m}^{-2}$ for $\mathrm{O_2}$, and $1.5 \times10^{19}~\mathrm{m}^{-2}$ to $2.2 \times10^{19}~\mathrm{m}^{-2}$ at the subsolar point for $\mathrm{H_2O}$. Both column densities however still lie within the uncertainties of Roth (2021). Our results provide additional evidence for the existence of a stable $\mathrm{H_2O}$ atmosphere at Europa.
Use of User Tour, Contact Form, and Accessibility Plugins in Enhancing a Moodle-Based Virtual Conference Experience
Creators: name: Banasihan, Verna
name: Pugoy, Reinald Adrian
name: Paras, Melvir Nathaniel
name: Magsino, Renz Jemil
name: Roxas, Eriberto Jr.
Publisher: name: Zenodo
Year: 2023

description: Academic conferences have been conducted in an online or hybrid setup ever since the onset of the pandemic. Various virtual platforms have arised to address this need but most of them are costly and offer varying features. The use of Moodle as a virtual conference platform is now being explored worldwide. The University of the Philippines Open University has used Moodle together with user tour function and plugins such as contact support and accessibility for its semi-annual National Conference on Open and Distance eLearning this 2022. The purpose of integrating these features is to enhance a Moodle-based virtual conference experience. A survey was conducted at the end of the conference to measure the effectiveness of using these features. Results showed that using user tour, contact support and accessibility plugins significantly enhanced the Moodle-based virtual conference experience of the participants. The use of these Moodle features can also still be improved in the future as suggested by the participants.
title: Summary Documentation for the IRIS UMETRICS 2019 Data Release
Creators: name: Nicholls, Natsuko
name: Uberseder, Lindsay
name: Owen-Smith, Jason
Publisher: name: Institute for Research on Innovation and Science (IRIS)
Year: 2019

description: This is a publicly available summary of the full data documentation, providing project and data descriptions for the IRIS UMETRICS 2019 Data Release.
Radiative heat transfer in 2D Dirac materials
Creators: name: Rodriguez-Lopez, Pablo
name: Tse, Wang-Kong
name: Dalvit, Diego A. R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene, within the framework of the local approximation for the optical response of these materials. In this approximation, which neglects spatial dispersion, we derive both numerically and analytically the short-distance asymptotic of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. Finally, we discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2D Dirac materials.
description: 15 pages, 4 figures. Updated version including corrected analysis of the far-field regime
Observable tests for the light-sail scenario of interstellar objects
Creators: name: Zhou, Wen-Han
name: Liu, Shang-Fei
name: Zhang, Yun
name: Lin, Douglas N. C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We scrutinize the light sail scenario of the first interstellar object (ISO) 1I/2017 U1 (`Oumuamua) by making comparisons between physical models and observational constraints. These analyses can be generalized for future surveys of `Oumuamua-like objects. The light sail goes through a drift in the interstellar space due to the magnetic field and gas atoms, which poses challenges to the navigation system. When the light sail enters the inner solar system, the sideways radiation pressure leads to a considerable non-radial displacement. The immensely high dimensional ratio and the tumbling motion could cause a light curve with an extremely large amplitude and could even make the light sail invisible from time to time. These observational features allow us to examine the light sail scenario of interstellar objects. Our results show that the drift of the freely rotating light sail in the interstellar medium is $\sim 100\,$au even if the travel distance is only 1 pc. The probability is < 1.5\% for the expected brightness modulation of the light sail to match with `Oumuamua's observed variation amplitude ($\sim$ 2.5 -- 3). In addition, the probability is 0.4% for the tumbling light-sail to be visible (brighter than V=27) in all 55 observations spread over two months after discovery. Radiation pressure could cause a larger displacement that is normal to the orbital plane for a lightsail than that for `Oumuamua. Also, the ratio of anti-solar to sideways acceleration of `Oumuamua deviates from that of the light sail by ~ 1.5σ. We suggest that `Oumuamua is unlikely a light sail. The dynamics of an intruding light sail, if exist, has distinct observational signatures, which can be quantitatively identified and analyzed with our methods in future surveys.
description: 17 pages, 13 figures Comments are welcome
Photo-electrochemical XAS studies for efficient water splitting
Creators: name: Dacapito, Francesco
Publisher: name: Zenodo
Year: 2023

description: Presentation at the SOLARIS synchrotron, March 22 2023 This presentation covers the topic of water photo-hydrolysis and provides a detailed explanation of the X-ray Absorption Spectroscopy technique. The LISA beamline at ESRF is also introduced, followed by a discussion of various experiments on materials for water splitting through photo-electrochemistry.
A self-consistent dynamical model of the Milky Way disc adjusted to Gaia data
Creators: name: Robin, A. C.
name: Bienaymé, O.
name: Salomon, J. B.
name: Reylé, C.
name: Lagarde, N.
name: Figueras, F.
name: Mor, R.
name: Fernández-Trincado, J. G.
name: Montillaud, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: This paper shows how a self-consistent dynamical model can be obtained by fitting the gravitational potential of the Milky Way to the stellar kinematics and densities from Gaia data. Using the Besancon Galaxy Model we derive a potential and the disc stellar distribution functions are computed based on three integrals of motion to model stationary stellar discs. The gravitational potential and the stellar distribution functions are built self-consistently, and then adjusted to be in agreement with the kinematics and the density distributions obtained from Gaia observations. A Markov chain Monte Carlo (MCMC) is used to fit the free parameters of the dynamical model to Gaia parallax and proper motion distributions. The fit is done on several sets of Gaia eDR3 data, widely spread in longitudes and latitudes. We are able to determine the velocity dispersion ellipsoid and its tilt for sub-components of different ages, both varying with R and z. The density laws and their radial scale lengths, for the thin and thick disc populations are also obtained self-consistently. This new model has some interesting characteristics, such as a flaring thin disc. The thick disc is found to present very distinctive characteristics from the old thin disc, both in density and kinematics. This well supports the idea that thin and thick discs were formed in distinct scenarios as the density and kinematics transition between them is found to be abrupt. The dark matter halo is shown to be nearly spherical. We also derive the Solar motion to be (10.79 $\pm$ 0.56, 11.06 $\pm$ 0.94, 7.66 $\pm$ 0.43) km/s, in good agreement with recent studies. The resulting fully self-consistent gravitational potential, still axisymmetric, is a good approximation of a smooth mass distribution in the Milky Way and can be used for further studies, including to compute orbits for real stars in our Galaxy (abridged).
description: Final version, 26 pages, 14 figures. A&A in press