cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fabrication and modeling of composite-collector heterojunction bipolar transistors
Creators: name: Ghodsian, Bahram
Publisher: name: University of British Columbia
Year: 2009

description: This thesis is concerned with processing and modeling aspects of heterojunction bipolar transistors (HBTs) with composite-collectors. HBTs with InGaAs/InP composite collectors were designed, fabricated and measured. Their dc characteristics are compared with those of a device which was structurally similar but with a conventional n-InGaAs collector. The measured data for both devices can be well-described by an analytical model. The model indicates the need to ensure that the InGaAs layer in the composite collector exceed a critical thickness if the current gain is to be preserved. It is also shown that the spacer layer between the emitter and base, which was used to prevent zinc diffusion into the emitter, must be considered in the model if the collector current is to be correctly predicted. The comparison of the experimental data also suggests that surface recombination is not a dominant base recombination current in the devices studied.
Spark Deficient Gabor Frame Provides a Novel Analysis Operator for Compressed Sensing
Creators: name: Kouni, Vasiliki
name: Rauhut, Holger
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The analysis sparsity model is a very effective approach in modern Compressed Sensing applications. Specifically, redundant analysis operators can lead to fewer measurements needed for reconstruction when employing the analysis $l_1$-minimization in Compressed Sensing. In this paper, we pick an eigenvector of the Zauner unitary matrix and -- under certain assumptions on the ambient dimension -- we build a spark deficient Gabor frame. The analysis operator associated with such a spark deficient Gabor frame, is a new (highly) redundant Gabor transform, which we use as a sparsifying transform in Compressed Sensing. We conduct computational experiments -- on both synthetic and real-world data -- solving the analysis $l_1$-minimization problem of Compressed Sensing, with four different choices of analysis operators, including our Gabor analysis operator. The results show that our proposed redundant Gabor transform outperforms -- in all cases -- Gabor transforms generated by state-of-the-art window vectors of time-frequency analysis.
Charged Higgs Bosons decays H^\pm \to W^\pm (γ, Z) revisited
Creators: name: Arhrib, Abdesslam
name: Benbrik, Rachid
name: Chabab, Mohamed
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the complete one loop contribution to H^\pm\to W^\pm V, V= Z, γ, both in the Minimal Supersymmetric Standard Model (MSSM) and in the Two Higgs Doublet Model (2HDM). We evaluate the MSSM contributions and compare them with the 2HDM ones taking into account b\to sγconstraint, vacuum stability and unitarity constraints in the case of 2HDM, as well as experimental constraints on the MSSM and 2HDM parameters. In the MSSM, we found that in the intermediate range of \tanβ\la 10 and for large A_t, the branching ratio of H^\pm \to W^{\pm} Z can be of the order 10^{-3} while the branching ratio of H^\pm \to W^{\pm} γis of the order 10^{-5}. We also study the effects of the CP violating phases of Soft SUSY parameters and found that they can modify the branching ratio by about one order of magnitude. However, in the 2HDM where the Higgs sector is less constrained as compared to the MSSM higgs sector, one can reach branching ratio of the order 10^{-2} for both modes.
description: 18 pages, 9 figures
Imaginary images and Stokes phenomena in the weak plasma lensing of coherent sources
Creators: name: Jow, Dylan L.
name: Lin, Fang Xi
name: Tyhurst, Emily
name: Pen, Ue-Li
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The study of astrophysical plasma lensing, such as in the case of extreme scattering events, has typically been conducted using the geometric limit of optics, neglecting wave effects. However, for the lensing of coherent sources such as pulsars and fast radio bursts (FRBs), wave effects can play an important role. Asymptotic methods, such as the so-called Eikonal limit, also known as the stationary phase approximation, have been used to include first-order wave effects; however, these methods fail at Stokes lines. Stokes lines are generic features of a variety of lens models, and are regions in parameter space where imaginary images begin to contribute to the overall intensity modulation of lensed sources. Using the mathematical framework of Picard-Lefschetz theory to compute diffraction integrals, we argue that these imaginary images contain as much information as their geometric counterparts, and may potentially be observable in data. Thus, weak-lensing events where these imaginary images are present can be as useful for inferring lens parameters as strong-lensing events in which multiple geometric images are present.
Beginners' Quest to Formalize Mathematics: A Feasibility Study in Isabelle
Creators: name: Bayer, Jonas
name: David, Marco
name: Pal, Abhik
name: Stock, Benedikt
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: How difficult are interactive theorem provers to use? We respond by reviewing the formalization of Hilbert's tenth problem in Isabelle/HOL carried out by an undergraduate research group at Jacobs University Bremen. We argue that, as demonstrated by our example, proof assistants are feasible for beginners to formalize mathematics. With the aim to make the field more accessible, we also survey hurdles that arise when learning an interactive theorem prover. Broadly, we advocate for an increased adoption of interactive theorem provers in mathematical research and curricula.
description: 11 pages, 1 figure; Published as a conference paper at CICM 2019
Design of an in-situ ellipsometer
Creators: name: Kleinschmidt, Alfred
Publisher: name: University of British Columbia
Year: 2008

description: Ellipsometry is a nondestructive analysis technique for studying surfaces, interfaces and thin films. The fabrication of multilayered structures, which can consist of several hundred layers, by sputter deposition of two materials having different refractive indices requires careful control of the individual layer thicknesses. In-situ monitoring of the deposition process is clearly the optimal way to achieve a high quality film and layer structure. An in-situ ellipsometer can be mounted on a deposition chamber and, through view ports, make a measurement of the complex reflection coefficient of the sample inside during the deposition process. Through an appropriate mathematical model, the thickness of the deposited layer can be determined from the ellipsometric data. This thesis presents an account of the design, construction and operation of an in-situ, rotating compensator ellipsometer. The completed prototype achieved a precision and repeatability of better than ± 1 A when measuring a Si02layer on a silicon substrate. Thicknesses obtained from measurements corrected for the birefringence of the vacuum port windows agreed with accepted values to within a monolayer for thin (< 1000 A) layers of Si02 on silicon, and to within 3monolayers for samples up to 2200 A thick.
Σχεδιασμός και υλοποίηση συστήματος υποστήριξης κλινικών μελετών στις νευροεπιστήμες με τη χρήση τεχνικών μηχανικής μάθησης
Creators: name: Ταμπάκη, Ειρήνη Μαρία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Shiny
Empedocles
Διερευνητική Ανάλυση Δεδομένων
Στατιστική Συμπερασματολογία
Τεχνητά Νευρωνικά Δίκτυα
Support Vector Machines
EDA
Statistical Inference
Artificial Neural Networks

description: Στην παρούσα διπλωματική εργασία σχεδιάζεται και υλοποιείται μία διαδραστική διαδικτυακή εφαρμογή, για την επεξεργασία, ανάλυση, οπτικοποίηση και μοντελοποίηση ιατρικών δεδομένων με τη χρήση αλγορίθμων μηχανικής μάθησης για ταξινόμηση και πρόβλεψη. Η εφαρμογή αναπτύχθηκε με τη χρήση του πακέτου RShiny και λειτουργεί επικουρικά στον ηλεκτρονικό φάκελο ασθενή ‘Empedocles’, στον οποίο αποθηκεύονται δεδομένα που αφορούν ασθενείς που πάσχουν από άνοια τύπου Alzheimer ή άλλου τύπου άνοιες, αλλά και άλλα νευροεκφυλιστικά νοσήματα. Απευθύνεται σε γιατρούς, ψυχολόγους, άλλους επαγγελματίες υγείας κι ερευνητές στον τομέα των νευροεκφυλιστικών παθήσεων και κύριος στόχος της είναι η προώθηση της επιστημονικής έρευνας.
description: In this diploma thesis, an interactive web application is designed and implemented for the processing, analysis, visualization and modelling of medical data using machine learning algorithms for classification and prediction. The app was developed using the RShiny package and is working as an adjunct to the electronic health record 'Empedocles', which stores data on patients who have Alzheimer's disease or other dementia/neurodegenerative diseases. It is targeted to doctors, psychologists, other health professionals and researchers in the field of neurodegenerative diseases, and its primary purpose is to promote scientific research.
description: Σε συνεργασία με: Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
The Weitzenböck Machine
Creators: name: Semmelmann, Uwe
name: Weingart, Gregor
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 53B20;58J60;17B35

description: In this article we give a unified treatment of the construction of all possible Weitzenböck formulas for all irreducible, non--symmetric holonomy groups. The resulting classification is two--fold, we construct explicitly a basis of the space of Weitzenböck formulas on the one hand and characterize Weitzenböck formulas as eigenvectors for an explicitly known matrix on the other. Both classifications allow us to find tailor--suit Weitzenböck formulas for applications like eigenvalue estimates or Betti number estimates.
description: 48 pages
Ανάπτυξη συστήματος απτικής διεπαφής χρήστη με βάση ευφυείς κύβους
Creators: name: Μουλαδένιος, Κωνσταντίνος Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: απτική διεπαφή
ευφυείς κύβοι
εκπαιδευτικό εργαλείο
haptic interface
smart cubes
educational tool

description: Η χρήση απτικών τεχνολογιών στην εκπαίδευση φέρνει αρκετά θετικά αποτελέσματα στο πεδίο της μάθησης. Έχουν αναπτυχθεί πολλαπλές επιτυχημένες απτικές διεπαφές χρήστη με στόχο την εισαγωγή τους στις μεθόδους διδασκαλίας, ωστόσο, οι περισσότερες έχουν έναν ξεκάθαρο μαθησιακό στόχο, πάνω σε ένα μοναδικό πεδίο γνώσης, όπως για παράδειγμα ο προγραμματισμός και δεν προσφέρουν αρκετή ευελιξία και επεκτασιμότητα όσον αφορά στο περιεχόμενο μάθησης που καλύπτουν. Η διπλωματική αυτή αφορά την σχεδίαση και υλοποίηση ενός συστήματος απτικής διεπαφής, με βάση ευφυείς φυσικούς κύβους, μέσω της οποίας εκτελούνται δραστηριότητες που εκτείνονται σε ένα ευρύ φάσμα θεματικών κατηγοριών, προσφέροντας έτσι μία πολύπλευρη εμπειρία μάθησης. Το ανεπτυγμένο σύστημα υλοποιεί μία αρχιτεκτονική τριών επιπέδων , η οποία περιλαμβάνει την απτική διεπαφή, με την οποία ασχολούνται οι μαθητές, ένα διαδικτυακό αποθετήριο δραστηριοτήτων και μία ενδιάμεση εφαρμογή διαχείρισης και ελέγχου της εκτέλεσης αυτών των δραστηριοτήτων, με κύριο χρήστη τον εκπαιδευτικό που επιβλέπει την όλη διαδικασία
description: The use of haptic technologies in education brings many positive outcomes in the field of learning. Many successful tangible user interfaces have been developed with the goal of being part of the teaching methodologies, however, most of them have a clear learning objective over a single field of knowledge, like for example programming, and they do not offer flexibility and extensibility on the content of learning they include. This thesis is about the design and implementation of a tangible user interface system, based on smart haptic cubes, that executes various activities covering a wide range of subject areas, thus providing a multilevel learning experience. The developed system implements a 3-tier architecture, that includes the tangible user interface, that the students manipulate, an online repository of activities and an intermediate application that manages and controls the execution of these activities, with the main user being the instructor that oversees the whole process
Computational Phylogenetics and the Internal Structure of Pama-Nyungan: Supplementary Materials
Creators: name: Bowern, Claire
name: Atkinson, Quentin
Publisher: name: Zenodo
Year: 2012
Subjects: phylogenetics
Pama-Nyungan

description: Supplementary materials for 2012 Language paper. (10.1353/lan.2012.0081)
Emulsion Destabilization by Squeeze Flow
Creators: name: Dekker, Riande I
name: Deblais, Antoine
name: Velikov, Krassimir P
name: Veenstra, Peter
name: Colin, Annie
name: Kellay, Hamid
name: Kegel, Willem K
name: Bonn, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: There is a large debate on the destabilization mechanism of emulsions. We present a simple technique using mechanical compression to destabilize oil-in-water emulsions. Upon compression of the emulsion, the continuous aqueous phase is squeezed out, while the dispersed oil phase progressively deforms from circular to honeycomb-like shapes. The films that separate the oil droplets are observed to thin and break at a critical oil/water ratio, leading to coalescence events. Electrostatic interactions and local droplet rearrangements do not determine film rupture. Instead, the destabilization occurs like an avalanche propagating through the system, starting at areas where the film thickness is smallest.
description: 16 pages, 5 figures
Graphene oxide films for ultra-flat optics and linear and nonlinear integrated photonic circuits
Creators: name: Wu, Jiayang
name: Jia, Linnan
name: Zhang, Yuning
name: Qu, Yang
name: Jia, Baohua
name: Moss, David J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: With superior optical properties, high flexibility in engineering its material properties, and strong capability for large-scale on-chip integration, graphene oxide (GO) is an attractive solution for on-chip integration of two-dimensional (2D) materials to implement functional integrated photonic devices capable of new features. Over the past decade, integrated GO photonics, representing an innovative merging of integrated photonic devices and thin GO films, has experienced significant development, leading to a surge in many applications covering almost every field of optical sciences. This paper reviews the recent advances in this emerging field, providing an overview of the optical properties of GO as well as methods for the on-chip integration of GO. The main achievements made in GO hybrid integrated photonic devices for diverse applications are summarized. The open challenges as well as the potential for future improvement are also discussed.
description: 45 pages, 18 figures 211 references
Laws of the single logarithm for delayed sums of random fields
Creators: name: Gut, Allan
name: Stadtmüller, Ulrich
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We extend a law of the single logarithm for delayed sums by Lai to delayed sums of random fields. A law for subsequences, which also includes the one-dimensional case, is obtained in passing.
description: Published in at http://dx.doi.org/10.3150/07-BEJ103 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
Creators: name: Camargo-Molina, José Eliel
name: Enberg, Rikard
name: Löfgren, Johan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition. We therefore study the EWPT in the Standard Model Effective Field Theory (SMEFT) including dimension-six operators. A first-order EWPT has previously been shown to be possible in the SMEFT. Phenomenology studies have focused on scenarios with a tree-level barrier between minima, which requires a negative Higgs quartic coupling and a new physics scale low enough to raise questions about the validity of the EFT approach. In this work we stress that a first-order EWPT is also possible when the barrier between minima is generated radiatively, the quartic coupling is positive, the scale of new physics is higher, and there is good agreement with experimental bounds. Our calculation is done in a consistent, gauge-invariant way, and we carefully analyze the scaling of parameters necessary to generate a barrier in the potential. We perform a global fit in the relevant parameter space and explicitly find the points with a first-order transition that agree with experimental data. We also briefly discuss the prospects for probing the allowed parameter space using di-Higgs production in colliders.
description: 18 pages, 5 figures (version accepted for publication, minor changes)
A simple description of holographic domain walls in confining theories -- extended hydrodynamics
Creators: name: Janik, Romuald A.
name: Jarvinen, Matti
name: Sonnenschein, Jacob
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of theories with a first order phase transition, we propose a general covariant description of coexisting phases separated by domain walls using an additional order parameter-like degree of freedom. In the case of a holographic Witten model with a confining and deconfined phase, the resulting model extends hydrodynamics and has a simple formulation in terms of a spacetime action with corresponding expressions for the energy-momentum tensor. The proposed description leads to simple analytic profiles of domain walls, including expressions for surface tension density, which agree nicely with holographic numerical solutions, despite the apparent complexity of those gravitational backgrounds.
description: 51 pages, 11 figures. v2: references updated
Development and acceptability of an interactive voice response intervention to support medication adherence in patients with hypertension and/or type 2 diabetes within the primary care. A think aloud study
Creators: name: Kassavou, Aikaterini
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019

description: Katerina Kassavou1* and Stephen Sutton1 1Department of Public Health and Primary Care, Primary Care Unit, University of Cambridge, United Kingdom The aim of this study was to pretest the acceptability of an Interactive Voice Response (IVR) intervention to support patients with hypertension and/or type 2 diabetes, as an adjunct to primary care. The intervention contains Behaviour Change Techniques to promote medication adherence, and is based on the theoretical framework that distinguish between Intentional Non Adherence (INA) and Non Intentional Non Adherence (NINA). To our knowledge, this is the first study to develop and pretest a theory and evidencebased IVR intervention outside of the US. We developed and pretested the IVR in 13 patients with hypertension and/or type 2 diabetes, recruited from primary care databases and presumed to be nonadherent. Facetoface interviews at patients’ places were conducted, where each patient received IVR messages and asked to provide experiential feedback about the delivery mode and the intervention content. Think aloud protocol was used to assess intervention acceptability and thematic analysis informed the results. Participants gave positive feedback on the IVR as a way to support medication adherence between their primary care consultations. Specifically, participants liked the navigation options, the voice delivering the messages and the voice recognition software. For intervention content, participants preferred messages that were tailored and personalised, and messages that consisted of information about health consequences, action plans and questions to report medication taking. Patients recommended IVR as an acceptable platform to support adherence to medications between primary care consultations. Future studies could usefully test the feasibility of tailored IVR interventions to support medication adherence in the primary care. Conflict of Interest: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
High-energy magnetic excitations from dynamic stripes in LBCO (x=1/8)
Creators: name: Xu, Guangyong
name: Tranquada, J. M.
name: Perring, T. G.
name: Gu, G. D.
name: Fujita, M.
name: Yamada, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use inelastic neutron scattering to study the temperature dependence of magnetic excitations (for energies up to 100 meV) in the cuprate La$_{1.875}$Ba$_{0.125}$CuO$_4$. This compound exhibits stripe order below a temperature of ~50 K; previous measurements have shown that the magnetic excitations of the stripe-ordered phase have an hour-glass-like dispersion, with a saddle point at ~50 meV. Here we compare measurements in the disordered phase taken at 65 and 300 K. At energies on the scale of $k_{\rm B}T$, there is substantial momentum-broadening of the signal, and the low-energy incommensurate features can no longer be resolved at 300 K. In contrast, there is remarkably little change in the scattered signal for energies greater than $k_{\rm B}T$. In fact, the momentum-integrated dynamic susceptibility is almost constant with temperature. We suggest that the continuity of higher-energy magnetic excitations is strong evidence for dynamic stripes in the high-temperature, disordered phase. We reconsider the nature of the magnetic dispersion, and we discuss the correspondences between the thermal evolution of magnetic stripe correlations with other electronic properties of the cuprates.
Generalized eigenproblem without fermion doubling for Dirac fermions on a lattice
Creators: name: Pacholski, M. J.
name: Lemut, G.
name: Tworzydło, J.
name: Beenakker, C. W. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The spatial discretization of the single-cone Dirac Hamiltonian on the surface of a topological insulator or superconductor needs a special "staggered" grid, to avoid the appearance of a spurious second cone in the Brillouin zone. We adapt the Stacey discretization from lattice gauge theory to produce a generalized eigenvalue problem, of the form ${\mathcal H}ψ=E {\mathcal P}ψ$, with Hermitian tight-binding operators ${\mathcal H}$, ${\mathcal P}$, a locally conserved particle current, and preserved chiral and symplectic symmetries. This permits the study of the spectral statistics of Dirac fermions in each of the four symmetry classes A, AII, AIII, and D.
description: 16 pages, 3 figures
Προσδιοριστικοί παράγοντες οικονομικής μεγέθυνσης στην Ευρωζώνη
Creators: name: Ανδρώνη, Ελένη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Προσδιοριστικοί παράγοντες
Οικονομική μεγέθυνση
Ευρωζώνη
Determinants
Economic growth
Eurozone

description: Η Ευρωζώνη, αποτελούμενη από 19 χώρες, είναι το αντικείμενο της εμπειρικής μελέτης προσδιοριστικών παραγόντων της οικονομικής μεγέθυνσής της για την περίοδο 1993-2018. Η Ευρωζώνη είναι ομοιογενής περιοχή ως υποσύνολο της Ευρωπαϊκής Ένωσης και ταυτόχρονα ανομοιογενής ως προς την οικονομική συμπεριφορά των χωρών της. Η εκτίμηση διεξάγεται με τη μέθοδο Fixed Effects αξιοποιώντας δεδομένα από την Παγκόσμια Τράπεζα. Τα βασικά συμπεράσματα είναι πως οι δημόσιες δαπάνες, οι Ξένες Άμεσες Επενδύσεις και η ανεργία επιδρούν αρνητικά στην οικονομική μεγέθυνση, ενώ ο ακαθάριστος σχηματισμός κεφαλαίου, η συμμετοχή στην τριτοβάθμια εκπαίδευση και η οικονομική ανοιχτότητα έχουν θετικό αντίκτυπο, με το προσδόκιμο όριο ζωής να μην έχει ξεκάθαρη επίδραση
description: Eurozone, a group of 19 countries, is the object of the current empirical study of identifying the main determinants of economic growth for the 1993-2018 period. Eurozone is a homogeneous area that is also part of the European Union as well as non-homogeneous in terms of economic performance of its member-countries. The estimation utilizes the Fixed Effects methodology and is using World Bank’s data. The main results indicate that public expenditure, Foreign Direct Investment and unemployment affect negatively the economic growth, whilst Gross Capital Formation, enrollment in tertiary education and openness have a positive impact, with life expectancy having an ambiguous impact
Real-time Discovery of AT2020xnd: A Fast, Luminous Ultraviolet Transient with Minimal Radioactive Ejecta
Creators: name: Perley, Daniel A.
name: Ho, Anna Y. Q.
name: Yao, Yuhan
name: Fremling, Christoffer
name: Anderson, Joseph P.
name: Schulze, Steve
name: Kumar, Harsh
name: Anupama, G. C.
name: Barway, Sudhanshu
name: Bellm, Eric C.
name: Bhalerao, Varun
name: Chen, Ting-Wan
name: Duev, Dmitry A.
name: Galbany, Lluís
name: Graham, Matthew J.
name: Gromadzki, Mariusz
name: Gutiérrez, Claudia P.
name: Ihanec, Nada
name: Inserram, Cosimo
name: Kasliwal, Mansi M.
name: Kool, Erik C.
name: Kulkarni, S. R.
name: Laher, Russ R.
name: Masci, Frank J.
name: Neill, James D.
name: Nicholl, Matt
name: Pursiainen, Miika
name: van Roestel, Joannes
name: Sharma, Yashvi
name: Sollerman, Jesper
name: Walters, Richard
name: Wiseman, Philip
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The many unusual properties of the enigmatic AT2018cow suggested that at least some subset of the empirical class of fast blue optical transients (FBOTs) represents a genuinely new astrophysical phenomenon. Unfortunately, the intrinsic rarity and fleeting nature of these events have made it difficult to identify additional examples early enough to acquire the observations necessary to constrain theoretical models. We present here the Zwicky Transient Facility discovery of AT2020xnd (ZTF20acigmel, the "Camel") at z=0.243, the first unambiguous AT2018cow analog to be found and confirmed in real time. AT2018cow and AT2020xnd share all key observational properties: a fast optical rise, sustained high photospheric temperature, absence of a second peak attributable to ejection of a radioactively-heated stellar envelope, extremely luminous radio, millimetre, and X-ray emission, and a dwarf-galaxy host. This supports the argument that AT2018cow-like events represent a distinct phenomenon from slower-evolving radio-quiet supernovae, likely requiring a different progenitor or a different central engine. The sample properties of the four known members of this class to date disfavour tidal disruption models but are consistent with the alternative model of an accretion powered jet following the direct collapse of a massive star to a black hole. Contextual filtering of alert streams combined with rapid photometric verification using multi-band imaging provides an efficient way to identify future members of this class, even at high redshift.
description: Accepted to MNRAS
Η καθυστέρηση στον λιμένα φόρτωσης
Creators: name: Μωυσιάδη, Μαριάννα Αναστασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αναμονή
Υπεραναμονή
Ανθυπερμονή
Αφιχθέν πλοίο
Ειδοποίηση ετοιμότητας
Ρήτρα υπαναχώρησης
Laytime
Demurrage
Damages for detention
Arrived ship
Notice of readiness
Cancelling clause

description: Ο καταμερισμός του κινδύνου των καθυστερήσεων μεταξύ των μερών της κατά ταξίδι ναύλωσης συναρτάται με την εναλλαγή των τεσσάρων σταδίων εκτέλεσης της σύβασης. Πολλά ζητήματα αναφορικά με τις καθυστερήσεις στα δύο πρώτα στάδια εκτέλεσης, που σχετίζονται με τον λιμένα φόρτωσης, δεν έχουν απασχολήσει εις βάθος την ελληνική νομική επιστήμη. Αντίστοιχα, οι σχετικές διατάξεις του Κ.Ι.Ν.Δ. φαίνεται να οδηγούν συχνά σε αντίθετα αποτελέσματα από το συνήθως συμβαίνον στη ναυτική πρακτική. Υπό αυτό το πρίσμα, κρίνουμε αναγκαία την κριτική μελέτη των προϋποθέσεων έναρξης του χρόνου αναμονής φόρτωσης και των θεσμών αναμονής, υπεραναμονής και ανθυπερμονής στο ελληνικό δίκαιο. Η μελέτη μας επικεντρώνεται στην ευθύνη ναυλωτή και εκναυλωτή για τις πιθανές καθυστερήσεις που σχετίζονται με την άφιξη και τις εργασίες που εκτελούνται στον λιμένα φόρτωσης. Προς τον σκοπό αυτό, προβαίνουμε σε συγκριτική μελέτη των ρυθμίσεων του ελληνικού δικαίου με αυτές του αγγλικού δικαίου και των πρότυπων ναυλοσυμφώνων και λαμβάνουμε υπ’ όψη τις πολυποίκιλες απόψεις ελληνικής και αγγλικής επιστήμης και νομολογίας. Έτσι, μας δίνεται η ευκαιρία να διαπιστώσουμε αστοχίες και επιτυχημένες ρυθμίσεις του ελληνικού δικαίου και, συγχρόνως, να προτείνουμε την αναμόρφωση των πρώτων και τον εμπλουτισμό των δεύτερων
description: The allocation of risk of delays between the parties of a voyage charterparty is associated with the succession of the four stages identified to voyage charterparties. Greek law theory has not thoroughly discussed several issues concerning delays at the loading port, viz concerning the first two stages of a charterparty. Similarly, the relevant provisions found in the Greek Code of Private Maritime Law often contradict with the common maritime practice. In this regard, it is essential that a critical study take place, concerning the requirements for the commencement of laytime and the regimes of laytime, demurrage and damages for detention under Greek law. We focus on shipowner’s and charterer’s liability for delays related to the arrival to and the works that take place at the loading port. To that end, we carry out an analysis of the Greek law provisions in comparison with the English law and the standard charterparties’ provisions, while taking into consideration the various views of the Greek and English theory and case law. In this way, we come across certain malfunctions and successful Greek law provisions; correspondingly, we offer suggestions for the reform of the former and the enrichment of the latter
An examination of differential survival in downstream migrating coho salmon smolts
Creators: name: Sawada, Joel O.
Publisher: name: University of British Columbia
Year: 2008

description: The smolt stage of the life history of Pacific salmon (Onchorhynchus sp.) has received little attention relative to the other life history stages. I examined mortality during the downstream migration of coho salmon (0. kisutch) smolts by trapping and marking smolts high in the watershed and recapturing the fish near the ocean. Four study sites were used, two in the upper watershed and two in the lower watershed. At both distances, lake-type and stream-type habitats were sampled. Factors which were found to influence survival included: 1) distance of migration, lower survival with increased migration distance; 2) juvenile rearing habitat, stream-type fish had higher survival; and 3) the timing of migration, fish migrating early in the season survived better. A fourth factor examined, the length of the fish at migration, did not influence survival. Although length did not affect survival, it was found that the center of the length distribution often had higher survival than the tails of the distribution, regardless of the absolute length. I performed two separate experiments to assess the effects of handling on fish survival. These experiments did not indicate my handling the fish affected survival. This thesis establishes differential survival occurs in salmon smolts, however the mechanisms causing differential survival are not known.
Elicitation of quantity and imperatives
Creators: name: Agodio, Olivier
name: , Ana
name: Sande, Hannah
name: Wang, Zhuxin (Ivy)
name: Wyschogrod, Ezra
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: dic

description: Speaker Ana does not speak Guébie but Bété de Daloa, thus the file bev_ana_20180724_izw_quant_mono is an elicitation of Bété de Daloa, not Guébie.
Exact Polynomial Solutions of the Mie-Type Potential in the N-Dimensional Schrodinger Equation
Creators: name: Ikhdair, Sameer M.
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The polynomial solution of the N-dimensional space Schrodinger equation for a special case of Mie potential is obtained for any arbitrary $% l-state. The exact bound-state energy eigenvalues and the corresponding eigenfunctions are calculated for diatomic molecular systems in the Mie-type potential. Keywords: Mie potential, Schrodinger equation, Eigenvalue, Eigenfunction, Diatomic molecules
description: 10 pages
BOSHLANG'ICH SINF O'QUVCHILARINI O'QITISH JARAYONIDA INTERFAOL METODLARDAN FOYDALANISH
Creators: name: Axmadaliyeva Muxarramoy , Saidmurodova Vazira , Jurayeva Shaxlo
Publisher: name: Zenodo
Year: 2024

description: Annotatsiya: Ushbu maqolada boshlang'ich sinflarda dars o’tish foydalanish usullari va hamda ularning samaradorligi o’rganilib tahlil etilgan.

Annotation: In this article, the methods of teaching in primary classes and their effectiveness are studied and analyzed.

Kalit so'zlar: Boshlang'ich ta'lim, pedagogik texnologiya, metodlar, interfaol metod, “6x6x6 “ metodi

Key words: Primary education, pedagogical technology, methods, interactive method, "6x6x6" method
A learning-based multiscale method and its application to inelastic impact problems
Creators: name: Liu, Burigede
name: Kovachki, Nikola
name: Li, Zongyi
name: Azizzadenesheli, Kamyar
name: Anandkumar, Anima
name: Stuart, Andrew
name: Bhattacharya, Kaushik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The macroscopic properties of materials that we observe and exploit in engineering application result from complex interactions between physics at multiple length and time scales: electronic, atomistic, defects, domains etc. Multiscale modeling seeks to understand these interactions by exploiting the inherent hierarchy where the behavior at a coarser scale regulates and averages the behavior at a finer scale. This requires the repeated solution of computationally expensive finer-scale models, and often a priori knowledge of those aspects of the finer-scale behavior that affect the coarser scale (order parameters, state variables, descriptors, etc.). We address this challenge in a two-scale setting where we learn the fine-scale behavior from off-line calculations and then use the learnt behavior directly in coarse scale calculations. The approach draws from recent successes of deep neural networks, in combination with ideas from model reduction. The approach builds on the recent success of deep neural networks by combining their approximation power in high dimensions with ideas from model reduction. It results in a neural network approximation that has high fidelity, is computationally inexpensive, is independent of the need for a priori knowledge, and can be used directly in the coarse scale calculations. We demonstrate the approach on problems involving the impact of magnesium, a promising light-weight structural and protective material.
Effect of deformation on two-neutrino double beta decay matrix elements
Creators: name: Alvarez-Rodriguez, R.
name: Sarriguren, P.
name: de Guerra, E. Moya
name: Pacearescu, L.
name: Faessler, A.
name: Simkovic, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the effect of deformation on the two-neutrino double beta decay for ground state to ground state transitions in all the nuclei whose half-lives have been measured. Our theoretical framework is a deformed QRPA based in Woods-Saxon or Hartree-Fock mean fields. We are able to reproduce at the same time the main characteristics of the two single beta branches, as well as the double beta matrix elements. We find a suppression of the double beta matrix element with respect to the spherical case when the parent and daughter nuclei have different deformations.
Dynamical Symmetry Indicators for Floquet Crystals
Creators: name: Yu, Jiabin
name: Zhang, Rui-Xing
name: Song, Zhi-Da
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Various exotic topological phases of Floquet systems have been shown to arise from crystalline symmetries. Yet, a general theory for Floquet topology that is applicable to all crystalline symmetry groups is still in need. In this work, we propose such a theory for (effectively) non-interacting Floquet crystals. We first introduce quotient winding data to classify the dynamics of the Floquet crystals with equivalent symmetry data, and then construct dynamical symmetry indicators (DSIs) to sufficiently indicate the "inherently dynamical" Floquet crystals. The DSI and quotient winding data, as well as the symmetry data, are all computationally efficient since they only involve a small number of Bloch momenta. We demonstrate the high efficiency by computing all elementary DSI sets for all spinless and spinful plane groups using the mathematical theory of monoid, and find a large number of different nontrivial classifications, which contain both first-order and higher-order 2+1D anomalous Floquet topological phases. Using the framework, we further find a new 3+1D anomalous Floquet second-order topological insulator (AFSOTI) phase with anomalous chiral hinge modes.
description: Close to the published version
Strength spotted: using positive reflective storytelling as a tool to identify the strengths of people living with an intellectual disability
Creators: name: Bruce, William
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Throughout history people living with an intellectual disability have been marginalised in the workforce, reporting some of the highest unemployment levels. While improvements in this area have been made, individuals living with intellectual disabilities continue to experience employment-related underachievement. A potential solution to this unfairness is empowering people living with an intellectual disability's ability to job craft. It is difficult for an individual to effectively job craft without a sound understanding of their own inherent strengths and skills. Psychometric testing typically focuses on analysing what people living with an intellectual disability can't do or through a deficit lens. This is where positive psychology and positive reflective storytelling can play a beneficial role. A pilot study was established, alongside an industry partner, to research this area in greater detail. This paper assesses the viability of using positive reflective storytelling as a strength spotting tool for people living with an intellectual disability. Stories were collected via an adapted version of the Reflected Best Self Exercise (RBSE), a well-established strength-spotting process. The researchers, alongside their industry partner, adapted the RBSE to improve its accessibility and, unlike the typical RBSE process where an individual collects their own stories, disability support workers played a key role in story collection. Our analysis found that this methodological approach so far, has had mixed success. Out of a possible ten participants the researchers were able to collect a meaningful data set for one participant. The inherent strengths of this participant were clearly identifiable, and they were perseverance, creativity, leadership, and kindness. The RBSE methodology is complex and time-consuming, and these are both clear limitations of its use. However, many potential future research opportunities exist in this space. Most notably conducting a group analysis to examine whether there is a set of inherent group strengths, shared by all people living with an intellectual disability.
Soft X-ray spectroscopy of highly charged silicon ions in dense plasmas
Creators: name: Liang, G. Y.
name: Zhao, G.
name: Zhong, J. Y.
name: Li, Y. T.
name: Liu, Y. Q.
name: Dong, Q. L.
name: Yuan, X. H.
name: Jin, Z.
name: Zhang, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Rich soft X-ray emission lines of highly charged silicon ions (Si VI--Si XII) were observed by irradiating an ultra-intense laser pulse with width of 200 fs and energy of $\sim$90 mJ on the solid silicon target. The high resolution spectra of highly charged silicon ions with full-width at half maximum (FWHM) of $\sim$0.3--0.4Åis analyzed in wavelength range of 40--90 Å. The wavelengths of 53 prominent lines are determined with statistical uncertainties being up to 0.005 Å. Collisional-radiative models were constructed for Si VI -- Si XII ions, which satisfactorily reproduces the experimental spectra, and helps the line identification. Calculations at different electron densities reveal that the spectra of dense plasmas are more complicate than the spectra of thin plasmas. A comparison with the Kelly database reveals a good agreement for most peak intensities, and differences for a few emission lines.
description: 18 pages, 6 figures, and 1 table; In press of publication on ApJS July issue
The Spacetime Algebra Approach to Massive Classical Electrodynamics with Magnetic Monopoles
Creators: name: Cafaro, Carlo
name: Ali, S. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Maxwell's equations with massive photons and magnetic monopoles are formulated using spacetime algebra. It is demonstrated that a single non-homogeneous multi-vectorial equation describes the theory. Two limiting cases are considered and their symmetries highlighted: massless photons with magnetic monopoles and finite photon mass in the absence of monopoles. Finally, it is shown that the EM-duality invariance is a symmetry of the Hamiltonian density (for Minkowskian spacetime) and Lagrangian density (for Euclidean 4-space) that reflects the signature of the respective metric manifold.
description: 10 pages, no figures
Teleportation with a Mixed State of Four Qubits and the Generalized Singlet Fraction
Creators: name: Yeo, Ye
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently, an explicit protocol ${\cal E}_0$ for faithfully teleporting arbitrary two-qubit states using genuine four-qubit entangled states was presented by us [Phys. Rev. Lett. {\bf 96}, 060502 (2006)]. Here, we show that ${\cal E}_0$ with an arbitrary four-qubit mixed state resource $Ξ$ is equivalent to a generalized depolarizing bichannel with probabilities given by the maximally entangled components of the resource. These are defined in terms of our four-qubit entangled states. We define the generalized singlet fraction ${\cal G}[Ξ]$, and illustrate its physical significance with several examples. We argue that in order to teleport arbitrary two-qubit states with average fidelity better than is classically possible, we have to demand that ${\cal G}[Ξ] > 1/2$. In addition, we conjecture that when ${\cal G}[Ξ] < 1/4$ then no entanglement can be teleported. It is shown that to determine the usefulness of $Ξ$ for ${\cal E}_0$, it is necessary to analyze ${\cal G}[Ξ]$.
description: 11 pages
Transport in a highly asymmetric binary fluid mixture
Creators: name: Bastea, Sorin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present molecular dynamics calculations of the thermal conductivity and viscosities of a model colloidal suspension with colloidal particles roughly one order of magnitude larger than the suspending liquid molecules. The results are compared with estimates based on the Enskog transport theory and effective medium theories (EMT) for thermal and viscous transport. We find, in particular, that EMT remains well applicable for predicting both the shear viscosity and thermal conductivity of such suspensions when the colloidal particles have a ``typical'' mass, i.e. much larger than the liquid molecules. Very light colloidal particles on the other hand yield higher thermal conductivities, in disagreement with EMT. We also discuss the consequences of these results to some proposed mechanisms for thermal conduction in nanocolloidal suspensions.
description: 13 pages, 6 figures, to appear in Physical Review E (2007)
Creep and drainage in the fast destabilization of emulsions Creep and drainage in the fast destabilization of emulsions
Creators: name: Dekker, Riande I.
name: Deblais, Antoine
name: Veltkamp, Bastiaan
name: Veenstra, Peter
name: Kegel, Willem K.
name: Bonn, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The destabilization of emulsions is important for many applications but remains incompletely understood. We perform squeeze flow measurements on oil-in-water emulsions, finding that the spontaneous destabilization of emulsions is generally very slow under normal conditions, with a characteristic time scale given by the drainage of the continuous phase and the coalescence of the dispersed phase. We show that if the emulsion is compressed between two plates, the destabilization can be sped up significantly; on the one hand, the drainage is faster due to the application of the squeezing force. On the other hand, creep processes lead to rearrangements that also contribute to the destabilization.
description: 8 pages, 6 figures
Revisiting the characteristics of the spectral lags in short gamma-ray bursts
Creators: name: Zhang, Zhibin
name: Xie, G. Z.
name: Deng, J. G.
name: Jin, W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper, we restudy the spectral lag features of short bright gamma-ray bursts (T90 < 2.6s) with a BATSE time-tagged event (TTE) sample including 65 single pulse bursts. We also make an investigation on the characteristics of ratios between the spectral lag and the full width at half maximum ($FWHM$) of the pulses, called relative spectral lags (RSLs). We draw the conclusions as follows: 1) Spectral lags of short GRBs are normally distributed and concentrated on around the value of 0.014 with 40 percent of them having negative lags. With K-S test, we find the lag distribution is identical with a normal one caused by white noises, which indicates the lags of the vast majority of short bursts are so small that they are negligible as Norris et al. have suggested.
description: 10 pages, 3 figures, accepted for publication in MNRAS
D5.3 EurOBIS/LOD Implementation Plan (slide deck)
Creators: name: Portier, Marc
Publisher: name: Zenodo
Year: 2024
Subjects: Eurobis
maregraph
LOD
open science

description: The report lists the expected features and service interface points of the new components to be developed.  It does so by considering the current state of the EurOBIS database system and workflow, as well as the overall planned architecture described in the D4.1 whitepaper. The target is to be a development guide as well as providing a concise description of the new services the LOD and LDES publications of EurOBIS will provide.