cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Η επίδραση των άυλων πάγιων στοιχείων και της κεφαλαιοποιημένης δαπάνης έρευνας και ανάπτυξης στην κερδοφορία και την αγοραία υπεραξία των επιχειρήσεων
Creators: name: Οικονόμου, Βαΐα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Άυλες επενδύσεις
subject: Γνωσιακό κεφάλαιο
subject: Οργανωσιακό κεφάλαιο
subject: Κερδοφορία
subject: Αγοραία υπεραξία

description: Τα τελευταία χρόνια οι επιχειρήσεις τείνουν όλο και περισσότερο στις άυλες επενδύσεις με σκοπό την δημιουργία αξίας. Δύο από τα πιο σημαντικά άυλα περιουσιακά στοιχεία σύμφωνα με την διεθνή βιβλιογραφία είναι το γνωσιακό κεφάλαιο και το οργανωσιακό. Σκοπός της παρούσας εργασίας είναι να εξετάσει τον βαθμό επίδρασης του γνωσιακού κεφαλαίου και του οργανωσιακού κεφαλαίου στην κερδοφορία των επιχειρήσεων και στην αγοραία υπεραξία τους. Η προσέγγιση του γνωσιακού αλλά και του οργανωσιακού κεφαλαίου στην παρούσα εργασία έγινε ακολουθώντας την μεθοδολογία υπολογισμού που ανέπτυξαν οι (Peters & Taylor, 2017). Ο δείκτης ROA χρησιμοποιήθηκε ως μέτρο της κερδοφορίας ενώ ο δείκτης Tobin’s q για την προσέγγιση της αγοραίας αξίας των επιχειρήσεων. Για την εκπόνηση της παρούσας διπλωματικής εργασίας χρησιμοποιήθηκε δείγμα εισηγμένων επιχειρήσεων των ΗΠΑ από τον κλάδο των υπηρεσιών για την χρονική περίοδο 2001-2017. Εφαρμόζοντας δύο γραμμικές πολλαπλές παλινδρομήσεις για τις δύο εξαρτημένες μεταβλητές ROA και Tobin’s q τα αποτελέσματα έδειξαν ότι το γνωσιακό κεφάλαιο επιδρά αρνητικά στην κερδοφορία των επιχειρήσεων ενώ επιδρά θετικά στην αγοραία υπεραξία τους. Όσον αφορά το οργανωσιακό κεφάλαιο τα αποτελέσματα έδειξαν επίσης ότι η επίδραση του στην κερδοφορία είναι αρνητική ενώ στην αγοραία υπεραξία των επιχειρήσεων θετική.
Hip fracture patient pathways and agent-based modelling
Creators: name: O'Connor, Alison
name: Ryan, Stephen.E.
name: Vaidya, Gauri
name: Harford, Paul
name: Kshirsagar, Meghana
Publisher: name: University of Limerick
Year: 2025
Subjects: classificationCode: 46
subject: Information and computing sciences
classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: Increased healthcare demand due to ageing populations is significantly straining European services. In Ireland patients presenting in Emergency Departments with hip-fracture injuries should be admitted to Orthopaedic wards or Theatre within four hours. However, the Irish Hip Fracture Database reports that less than 25~% of patients experience this pathway. Digital solutions, including advanced modelling techniques, offer a promising solution to optimising patient flow without impacting day-to-day healthcare provision. In this work, we outline ongoing research that aims to optimise healthcare provision for hip-fracture patients through improved data integration and agent-based simulations. We demonstrate how this technology, through enhanced connectivity, can improve healthcare service for hip fracture patients.
Altersgerechte Online-Lernangebote für Schülerinnen und Schüler der Primarstufe während der Corona Pandemie?
Creators: name: Schulte, Valerie
name: Viktoria Janker, Viktoria Janker
name: Kaiser, Deborah
name: Profous, Anna
name: Scherer, Fabian
Publisher: name: Medienimpulse
Year: 2020

description: Die COVID-19-Pandemie prägt seit Anfang des Jahres 2020 das gesellschaftliche und private Leben auf globaler Ebene. Dabei ist insbesondere der Bildungsbereich durch die gesetzlichen Einschränkungen betroffen. Während der Bildungsbetrieb ab der Sekundarstufe sowie der Hochschullehrbetrieb bereits vor der Corona-Pandemie unter Verwendung digitaler Hilfsmittel erfolgte, hinkte der Primarstufenbereich der ‚Digitalisierung‘ hinterher. Daher braucht/e es gerade für diesen Kontext spezifische Hilfestellungen. Eine davon ist die Website Homeschooling4kids, welche am 6. April 2020 online ging. Diese auf Kinder der Primarstufe und dem österreichischen Lehrplan der Primarstufe abgestimmte Lernplattform wurde innerhalb von drei Wochen von Studierenden entwickelt. Die Website folgt dem Leitbild von Chancengleichheit, Lernmotivation und Abwechslung. Der folgende Beitrag gibt Einblicke in die Prämissen und Ziele, stellt den Aufbau der Website vor und diskutiert die Funktionalität entlang medienpädagogischer Leitlinien.
description: Medienimpulse, Bd. 58 Nr. 02 (2020): Nähe(n) und Distanz(en) in Zeiten der COVID-19-Krise
Security and Governance in Financial Data Lakes: Challenges and Solutions
Creators: name: Abhilash Katari*
name: Karthik Allam
Publisher: name: Zenodo
Year: 2023
Subjects: Financial data lakes, data security, data governance, sensitive financial data, data breaches, insider threats, data integrity, access controls, regulatory compliance, metadata management, data quality, data lineage, encryption, RBAC, compliance monitoring, data masking, tokenization, continuous monitoring, incident response, cybersecurity, data protection, compliance frameworks, cloud storage, data privacy, governance policies.

description: Abstract: In today's financial landscape, data lakes have become essential for storing vast amounts of diverse and complex data. However, the security and governance of sensitive financial information within these repositories present significant challenges. Ensuring the protection of this data from breaches and unauthorized access is paramount, given the severe repercussions of potential data leaks. This abstract explores the key security concerns associated with financial data lakes, including issues of data integrity, confidentiality, and compliance with regulatory standards. Additionally, it highlights the importance of robust governance frameworks that encompass policies, procedures, and technologies designed to manage and safeguard data effectively. Solutions such as encryption, access controls, and regular audits are discussed as critical components in mitigating security risks. Moreover, the role of data governance in maintaining data quality, establishing clear accountability, and ensuring compliance with laws like GDPR and CCPA is examined. By addressing these challenges, financial institutions can leverage the full potential of data lakes while maintaining the highest standards of security and governance, thereby fostering trust and reliability in their data management practices.
Growth and regulation of springtail populations, with special reference to predation by pseudoscorpions
Creators: name: Johnson, Dan Lloyd
Publisher: name: University of British Columbia
Year: 2010

description: The effects of predation by a pseudoscorpion, Apochthonius minimus, on growing populations of springtails, Folsomia Candida, were studied experimentally. Analysis of individual springtail growth over time provided a technique for determining prey age. Predation rates and the degree of size-selection by the predator were measured. It was shown that the predators prefer older prey individuals and that this preference may result in higher densities of prey juveniles. Baseline data on population dynamics, population distributions, dispersal, species composition of the microarthropod community in the study area, soil moisture and weather were provided.
Elements and cyclic subgroups of finite order of the Cremona group
Creators: name: Blanc, Jérémy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 14E07, 20E45, 20G20

description: We give the classification of elements - respectively cyclic subgroups - of finite order of the Cremona group, up to conjugation. Natural parametrisations of conjugacy classes, related to fixed curves of positive genus, are provided.
description: 30 pages, to appear in Comment. Math. Helv
The H-2A Temporary Agricultural Worker Program in 2020
Creators: name: Castillo, Marcelo
name: Martin, Philip
name: Rutledge, Zachariah
name: Castillo, Marcelo
name: Martin, Philip
name: Rutledge, Zachariah
Publisher: name: Unknown
Year: 2022
Subjects: subject: Labor and Human Capital
subject: COVID-19
subject: H-2A guest workers
subject: farm wages
subject: farm labor

description: The H-2A Agricultural Guest Worker program allows U.S. agricultural employers who anticipate labor shortages to hire foreign workers on a temporary or seasonal basis. This report analyzes—by State, industry, and type of employer— the job offers of U.S. agricultural employers who sought U.S. Department of Labor certification in fiscal year 2020. The number of jobs certified to be filled with H-2A workers increased from around 75,000 in FY 2010 to around 275,000 in FY 2020. Six States accounted for 55 percent of H-2A jobs certified: Florida (14 percent), Georgia (10 percent), Washington (10 percent), California (9 percent), North Carolina (8 percent), and Louisiana (4 percent).
Effect of impurities on pentacene island nucleation
Creators: name: Conrad, B. R.
name: Gomar-Nadal, Elba
name: Cullen, W. G.
name: Pimpinelli, A.
name: Einstein, T. L.
name: Williams, E. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Pentacenequinone (PnQ) impurities have been introduced into a pentacene source material in a controlled manner to quantify the relative effects of the impurity content on grain boundary structure and thin film nucleation. Atomic force microscopy (AFM) has been employed to directly characterize films grown using 0.0-7.5% PnQ by weight in the source material. Analysis of the distribution of capture zones areas of submonolayer islands as a function of impurity content shows that for large PnQ content the critical nucleus size for forming a Pn island is smaller than for low PnQ content. This result indicates a favorable energy for formation of Pn-PnQ complexes, which in turn suggests that the primary effect of PnQ on Pn mobility may arise from homogeneous distribution of PnQ defects.
description: 16 Pages, 5 figures, 1 Table
QISHLOQ XO'JALIGI MAHSULOTLARI BOZORIDA FERMER XO'JALIKLARI MARKETING STRATEGIYASINING RIVOJLANISH TENDENSIYALARI
Creators: name: Nazarova, Gulruh
Publisher: name: Zenodo
Year: 2025

description: Fermer xo‘jaliklari qishloq xo‘jaligi mahsulotlari bozorida muhim o‘rin egallab, ularning marketing strategiyalarini takomillashtirish bozor talablariga moslashish va raqobatbardoshlikni oshirish uchun zarur hisoblanadi. Ushbu tadqiqot qishloq xo‘jaligi mahsulotlari bozorida fermer xo‘jaliklari marketing strategiyalarining rivojlanish tendensiyalarini o‘rganishga qaratilgan. Tadqiqot natijalari shuni ko‘rsatadiki, zamonaviy marketing vositalari – raqamli texnologiyalar, brendlash, mijozlarga yo‘naltirilgan strategiyalar va kooperatsiya mexanizmlaridan foydalanish fermerlar uchun yuqori samaradorlik keltiradi.
Global attractor and asymptotic smoothing effects for the weakly damped cubic Schrödinger equation in $L^2(\T)$
Creators: name: Molinet, Luc
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q55, 35B41

description: We prove that the weakly damped cubic Schrödinger flow in $L^2(\T)$ provides a dynamical system that possesses a global attractor. The proof relies on a sharp study of the behavior of the associated flow-map with respect to the weak $ L^2(\T) $-convergence inspired by a previous work of the author. Combining the compactness in $ L^2(\T) $ of the attractor with the approach developed by Goubet, we show that the attractor is actually a compact set of $ H^2(\T) $. This asymptotic smoothing effect is optimal in view of the regularity of the steady states.
description: Corrected version. To appear in Dynamics of Partial Differential Equations
Abstract composition rule for relativistic kinetic energy in the thermodynamical limit
Creators: name: Biro, T. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We demonstrate by simple mathematical considerations that a power-law tailed distribution in the kinetic energy of relativistic particles can be a limiting distribution seen in relativistic heavy ion experiments. We prove that the infinite repetition of an arbitrary composition rule on an infinitesimal amount leads to a rule with a formal logarithm. As a consequence the stationary distribution of energy in the thermodynamical limit follows the composed function of the Boltzmann-Gibbs exponential with this formal logarithm. In particular, interactions described as solely functions of the relative four-momentum squared lead to kinetic energy distributions of the Tsallis-Pareto (cut power-law) form in the high energy limit.
description: Submitted to Europhysics Letters. LaTeX, 3 eps figures
"Kohn-Shamification" of the classical density-functional theory of inhomogeneous polar molecular liquids with application to liquid hydrogen chloride
Creators: name: Lischner, Johannes
name: Arias, T. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The Gordian knot of density-functional theories for classical molecular liquids remains finding an accurate free-energy functional in terms of the densities of the atomic sites of the molecules. Following Kohn and Sham, we show how to solve this problem by considering noninteracting molecules in a set of effective potentials. This shift in perspective leads to an accurate and computationally tractable description in terms of simple three-dimensional functions. We also treat both the linear- and saturation- dielectric responses of polar systems, presenting liquid hydrogen chloride as a case study.
description: 4 pages, 2 eps-figures, submitted to Physical Review Letters
Regularization-based Continual Learning for Fault Prediction in Lithium-Ion Batteries
Creators: name: Maschler, Benjamin
name: Tatiyosyan, Sophia
name: Weyrich, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: In recent years, the use of lithium-ion batteries has greatly expanded into products from many industrial sectors, e.g. cars, power tools or medical devices. An early prediction and robust understanding of battery faults could therefore greatly increase product quality in those fields. While current approaches for data-driven fault prediction provide good results on the exact processes they were trained on, they often lack the ability to flexibly adapt to changes, e.g. in operational or environmental parameters. Continual learning promises such flexibility, allowing for an automatic adaption of previously learnt knowledge to new tasks. Therefore, this article discusses different continual learning approaches from the group of regularization strategies, which are implemented, evaluated and compared based on a real battery wear dataset. Online elastic weight consolidation delivers the best results, but, as with all examined approaches, its performance appears to be strongly dependent on task characteristics and task sequence.
description: 6 pages, 5 figures, 4 tables. Accepted at CIRP ICME 2021. arXiv admin note: text overlap with arXiv:2101.00509
Hervorbringung von Medienkonstellationen statt Nutzung didaktischer Werkzeuge. Versuch einer medienkulturwissenschaftlichen Didaktik der Bildungsmedien am Beispiel von Videokonferenzen als Unterrichtsform
Creators: name: Weich, Andreas
Publisher: name: Medienimpulse
Year: 2020

description: Seit Beginn der Corona-Krise sind vielfältige Transformationen medienkultureller Praktiken zu beobachten. Eine medienkulturwissenschaftliche Reflexion dieser Prozesse eröffnet in der Bildungspraxis hilfreiche Perspektiven. Denn die Herausforderungen bei der gegenwärtig erforderlichen Gestaltung von Alternativen zum Präsenzunterricht werden meist auf die Wahl didaktischer ‚Werkzeuge‘ und das Design didaktischer Szenarien beschränkt, obwohl es – so die These des Beitrags – in erster Linie um die voraussetzungsreiche und nur bedingt kontrollierbare Hervorbringung neuer Medienkonstellationen geht. Im Beitrag wird das Medienkonstellationsmodell als Heuristik zur Medienanalyse skizziert und anschließend aufgezeigt, welche Perspektiven der Medienreflexion es eröffnet und wie sie mit bestehenden mediendidaktischen Ansätzen verknüpft werden können. Darauf aufbauend wird versucht, eine medienkulturwissenschaftliche Didaktik zu konturieren und auf Videokonferenzen als Unterrichtsform anzuwenden.
description: Medienimpulse, Bd. 58 Nr. 02 (2020): Nähe(n) und Distanz(en) in Zeiten der COVID-19-Krise
Eliminating uncertainty of thermal emittance measurement in solenoid scans due to rf and solenoid fields overlap
Creators: name: Zheng, Lianmin
name: Du, Yingchao
name: Huang, Pengwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The solenoid scan is one of the most common methods for the in-situ measurement of the thermal emittance of a photocathode in an rf photoinjector. The fringe field of the solenoid overlaps with the gun rf field in quite a number of photoinjectors, which makes accurate knowledge of the transfer matrix challenging, thus increases the measurement uncertainty of the thermal emittance. This paper summarizes two methods that have been used to solve the overlap issue and explains their deficiencies. Furthermore, we provide a new method to eliminate the measurement error due to the overlap issue in solenoid scans. The new method is systematically demonstrated using theoretical derivations, beam dynamics simulations, and experimental data based on the photoinjector configurations from three different groups, proving that the measurement error with the new method is very small and can be ignored in most of the photoinjector configurations.
title: Διαχείριση αλλαγής σε επιχειρήσεις και οργανισμούς την περίοδο της πανδημίας: Η περίπτωση της ΕΥΔΑΠ
title: Change management during covid 19 pandemic. The case of Eydap
titleType: AlternativeTitle
Creators: name: Αλεξανδράκης, Γεώργιος
name: Ζαφειρίου, Χριστόδουλος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Διαχείριση αλλαγών
ΕΥΔΑΠ
Πανδημία
Οργανισμοί
Επιχειρήσεις
Βιωσιμότητα

description: Η παρούσα μελέτη αναφέρεται στη διαχείριση αλλαγών υπό το πρίσμα της πανδημίας του COVID19. Η πανδημία αποτελεί μια κατάσταση η οποία έφερε – και συνεχίζει να φέρνει ανατροπές στον τρόπο που οι άνθρωποι εργάζονται, επικοινωνούν, συναλλάσσονται. Η παρούσα μελέτη εστιάζει σε έναν οργανισμό κοινής ωφελείας, την ΕΥΔΑΠ και μέσω της ποσοτικής έρευνας διερευνάται ο τρόπος που εφαρμόστηκαν αλλαγές εξαιτίας της πανδημίας, η αντίληψη των εργαζομένων για τη διαχείριση της αλλαγής και οι αντιλήψεις τους για τα αποτελέσματα της εφαρμογής της αλλαγής. Σύμφωνα με τα αποτελέσματα της έρευνας, η πλειοψηφία των εργαζομένων συνειδητοποιεί την ανάγκη αλλαγής εξαιτίας της πανδημίας, αφού αυτή επηρέασε τον τρόπο εργασίας τους, αρνητικά. Επίσης, το όραμα και η διαδικασία της αλλαγής δεν ήταν ξεκάθαρα για όλους, οι εργαζόμενοι δεν γνώριζαν την ύπαρξη πλάνου διαχείρισης προβλημάτων, ενώ δεν συμμετείχαν ενεργά στην αλλαγή. Τα 2/3 των εργαζομένων δεν θεωρεί ότι υπήρξε αντίσταση στην αλλαγή. Παρόλα αυτά, όταν αυτή υπήρξε, οφειλόταν κυρίως στο φόβο για το άγνωστο. Επιπλέον, ως βασικός τρόπος για την αποτελεσματική υιοθέτηση της αλλαγής είναι η ανάπτυξη κουλτούρας μάθησης. Τέλος, πρόκειται για μια αλλαγή που συντελέστηκε, και ακόμη συντελείται, οπότε το χρονικό διάστημα είναι ακόμη μικρό για ασφαλή συμπεράσματα, γεγονός που αποδεικνύεται από το ότι οι εργαζόμενοι δεν είναι ακόμη σίγουροι για τις επιπτώσεις της αλλαγής, σε προσωπικό και επαγγελματικό επίπεδο.
A new derivation of the Minkowski metric
Creators: name: Chappell, James M.
name: Hartnett, John G.
name: Iannella, Nicolangelo
name: Iqbal, Azhar
name: Berkahn, David L.
name: Abbott, Derek
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Physics (physics.gen-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: 83-XX

description: The four dimensional spacetime continuum, as first conceived by Minkowski, has become the dominant framework within which to describe physical laws. In this paper, we show how this four-dimensional structure is a natural property of physical three-dimensional space, if modeled with Clifford geometric algebra $ C\ell(\Re^3) $. We find that Minkowski spacetime can be embedded within a larger eight dimensional structure. This then allows a generalisation of the invariant interval and the Lorentz transformations. Also, with this geometric oriented approach the fixed speed of light, the laws of special relativity and a generalised form of Maxwell's equations, arise naturally from the intrinsic properties of the algebra without recourse to physical arguments. We also find new insights into the nature of time, which can be described as two-dimensional. Some philosophical implications of this approach as it relates to the foundations of physical theories are also discussed.
description: 20 pages, no figures
Splitting of the superfluid transition in $^3$He by nematic aerogels
Creators: name: Fomin, I. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Role of inhomogeneous perturbations of nematic aerogel on the form of the order parameter emerging at the transition of liquid $^3$He in the superfluid state is considered. It is shown that a region of stability of the polar distorted ABM phase can begin right from the transition temperature. The symmetry argument is given, which selects the most favorable aerogel for stabilization of pure polar phase.
description: 7 hfges, no figures
$\Z_2^n$-graded quasialgebras and the Hurwitz problem on compositions of quadratic forms
Creators: name: Hu, Ya-Qing
name: Huang, Hua-Lin
name: Zhang, Chi
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Algebra (math.QA)
subject: Number Theory (math.NT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16S35, 16W50, 11E25

description: We introduce a series of $\Z_2^n$-graded quasialgebras $\bbP_n(m)$ which generalizes Clifford algebras, higher octonions, and higher Cayley algebras. The constructed series of algebras and their minor perturbations are applied to contribute explicit solutions to the Hurwitz problem on compositions of quadratic forms. In particular, we provide explicit expressions of the well-known Hurwitz-Radon square identities in a uniform way, recover the Yuzvinsky-Lam-Smith formulas, confirm the third family of admissible triples proposed by Yuzvinsky in 1984, improve the two infinite families of solutions obtained recently by Lenzhen, Morier-Genoud and Ovsienko, and construct several new infinite families of solutions.
description: 24 pages. Trans. of the AMS, in press
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Brandenburg, Björn B.
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2021
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Computer systems organization → Embedded and cyber-physical systems
subject: Computer systems organization → Real-time systems
subject: Software and its engineering → Real-time systems software

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 196, 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021), pages 0:i-0:xii
Using spin alignment of inelastically-excited fast beams to make spin assignments: the spectroscopy of 13O as a test case
Creators: name: Charity, R. J.
name: Webb, T. B.
name: Elson, J. M.
name: Hoff, D. E. M.
name: Pruitt, C. D.
name: Sobotka, L. G.
name: Navratil, P.
name: Hupin, G.
name: Kravvaris, K.
name: Quaglioni, S.
name: Brown, K. W.
name: Cerizza, G.
name: Estee, J.
name: Lynch, W. G.
name: Manfredi, J.
name: Morfouace, P.
name: Santamaria, C.
name: Sweany, S.
name: Tsang, M. B.
name: Tsang, T.
name: Zhu, K.
name: Kuvin, S. A.
name: McNeel, D.
name: Smith, J.
name: Wousmaa, A. H.
name: Chajecki, Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Excited states in 13O were investigated using inelastic scattering of an E/A=69.5-MeV 13O beam off of a 9Be target. The excited states were identified in the invariant-mass spectra of the decay products. Both single proton and sequential two-proton decays of the excited states were examined. For a number of the excited states, the protons were emitted with strong anisotropy where emissions transverse to the beam axis are favored. The measured proton-decay angular distributions were compared to predictions from distorted-wave born-approximation (DWBA) calculations of the spin alignment which was shown to be largely independent of the excitation mechanism. The deduced $^{13}$O level scheme is compared to ab initio no-core shell model with continuum (NCSMC) predictions. The lowest-energy excited states decay isotropically consistent with predictions of strong proton 1s1/2 structure. Above these states in the level scheme, we observed a number of higher-spin states not predicted within the model. Possibly these are associated with rotational bands built on deformed cluster configurations predicted by antisymmetrized molecular dynamics (AMD) calculations. The spin alignment mechanism is shown to be useful for making spin assignments and may have widespread use.
Lernen in immersiven virtuellen Welten aus der Perspektive der Mediendidaktik
Creators: name: Buchner, Josef
name: Mulders, Miriam
Publisher: name: Medienimpulse
Year: 2020

description: Virtual Reality (VR) Technologien können Lehr- und Lernsettings bereichern, oftmals ist der Einsatz jedoch technologiegetrieben. Aus der Perspektive der Mediendidaktik sollte die Konzeptionierung bei technologiegestützten Lernumgebungen nicht ausschließlich auf spezifische Merkmale der Technologie, bei VR etwa die Immersion, fokussieren, sondern ein Bildungsanliegen adressieren und anregende Lernaktivitäten für die Lernenden anbieten. Welche Aktivitäten besonders in immersiven virtuellen Welten ermöglicht werden können, fasst dieser Beitrag zusammen. Weiters skizzieren wir Beispiele aus der Praxis und geben Einblicke in ein spannendes Feld, welches zukünftig für alle Bildungsbereiche bedeutsamer werden wird. Gleichzeitig wollen wir Lehrende und Forschende bereits jetzt dazu ermutigen, VR für eigene Lehr- und Lernszenarien zu nutzen und den Einsatz zu beforschen.
description: Medienimpulse, Bd. 58 Nr. 02 (2020): Nähe(n) und Distanz(en) in Zeiten der COVID-19-Krise
Little String Origin of Surface Defects
Creators: name: Haouzi, Nathan
name: Schmid, Christian
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We derive the codimension-two defects of 4d $\mathcal{N} = 4$ Super Yang-Mills (SYM) theory from the (2, 0) little string. The origin of the little string is type IIB theory compactified on an ADE singularity. The defects are D-branes wrapping the 2-cycles of the singularity. We use this construction to make contact with the description of SYM defects due to Gukov and Witten [arXiv:hep-th/0612073]. Furthermore, we derive from a geometric perspective the complete nilpotent orbit classification of codimension-two defects, and the connection to ADE-type Toda CFT. The only data needed to specify the defects is a set of weights of the algebra obeying certain constraints, which we give explicitly. We highlight the differences between the defect classification in the little string theory and its (2, 0) CFT limit.
description: 64 pages, 18 figures. v2: Minor fixes and clarifications
Approaching the event horizon: 1.3mm VLBI of SgrA*
Creators: name: Doeleman, Sheperd S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Advances in VLBI instrumentation now allow wideband recording that significantly increases the sensitivity of short wavelength VLBI observations. Observations of the super-massive black hole candidate at the center of the Milky Way, SgrA*, with short wavelength VLBI reduces the scattering effects of the intervening interstellar medium, allowing observations with angular resolution comparable to the apparent size of the event horizon of the putative black hole. Observations in April 2007 at a wavelength of 1.3mm on a three station VLBI array have now confirmed structure in SgrA* on scales of just a few Schwarzschild radii. When modeled as a circular Gaussian, the fitted diameter of SgrA* is 37 micro arcsec (+16,-10; 3-sigma), which is smaller than the expected apparent size of the event horizon of the Galactic Center black hole. These observations demonstrate that mm/sub-mm VLBI is poised to open a new window onto the study of black hole physics via high angular resolution observations of the Galactic Center.
description: 6 pages, 4 figures, Proceedings for "The Universe under the Microscope" (AHAR 2008), held in Bad Honnef (Germany) in April 2008, to be published in Journal of Physics: Conference Series by Institute of Physics Publishing, R. Schoedel, A. Eckart, S. Pfalzner, and E. Ros (eds.)
Eine verkehrte Welt: Gesellschaftskritik in Todd Phillips „JOKER – an origin“ (2019)
Creators: name: Bintener, Liz
Publisher: name: Medienimpulse
Year: 2020

description: Vor dem aktuellen Hintergrund der COVID-19-Krise untersucht Liz Bintener im Rahmen einer Analyse von Todd Phillips mehrfach oscarprämierten Film „JOKER – an origin“ (2019), wie (Gesellschafts-)Kritik und Krise gerade im Medium der bewegten Bilder immer wieder verhandelt werden. Dabei präsentiert die Autorin angesichts (der Spielfigur) des JOKER ideologie- und d. i. gesellschaftskritische, sozialgeschichtliche, psychoanalytische und spieltheoretische Argumente, um in der Figur des Bösewichts (engl. villain) das Andere einer gegebenen Gesellschaft auszumachen, das in vielen Fällen damit in Zusammenhang steht, eben dieser Gesellschaft einen Spiegel vorzuhalten und ihr ganz im Sinne des (mittelalterlichen) Narren die Wahrheit über ihre inneren (Klassen-)Widersprüche vor Augen zu führen. Sehen wir also auf der Leinwand mit dem JOKER uns selbst? Und sagt der JOKER uns auch angesichts von COVID-19, was unsere neoliberale Gesellschaft im Innersten zusammenhält?
description: Medienimpulse, Bd. 58 Nr. 02 (2020): Nähe(n) und Distanz(en) in Zeiten der COVID-19-Krise
SizeFlags: Reducing Size and Fit Related Returns in Fashion E-Commerce
Creators: name: Nestler, Andrea
name: Karessli, Nour
name: Hajjar, Karl
name: Weffer, Rodrigo
name: Shirvany, Reza
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: E-commerce is growing at an unprecedented rate and the fashion industry has recently witnessed a noticeable shift in customers' order behaviour towards stronger online shopping. However, fashion articles ordered online do not always find their way to a customer's wardrobe. In fact, a large share of them end up being returned. Finding clothes that fit online is very challenging and accounts for one of the main drivers of increased return rates in fashion e-commerce. Size and fit related returns severely impact 1. the customers experience and their dissatisfaction with online shopping, 2. the environment through an increased carbon footprint, and 3. the profitability of online fashion platforms. Due to poor fit, customers often end up returning articles that they like but do not fit them, which they have to re-order in a different size. To tackle this issue we introduce SizeFlags, a probabilistic Bayesian model based on weakly annotated large-scale data from customers. Leveraging the advantages of the Bayesian framework, we extend our model to successfully integrate rich priors from human experts feedback and computer vision intelligence. Through extensive experimentation, large-scale A/B testing and continuous evaluation of the model in production, we demonstrate the strong impact of the proposed approach in robustly reducing size-related returns in online fashion over 14 countries.
description: Proceedings of the 27th ACM SIGKDD Conference on Knowledge Discovery and Data Mining
Adjusting to Higher Labor Costs in Selected U.S. Fresh Fruit and Vegetable Industries
Creators: name: Calvin, Linda
name: Martin, Philip
name: Simnitt, Skyler
name: Calvin, Linda
name: Martin, Philip
name: Simnitt, Skyler
Publisher: name: Unknown
Year: 2022
Subjects: subject: Labor and Human Capital
subject: Farm Management
subject: Automation
subject: farm labor
subject: fruit
subject: guest workers

description: This report examines how U.S. producers of selected labor-intensive fresh fruit and vegetables are addressing the rising costs of labor. Farm labor costs increased from 2010-19 for several reasons, including fewer newly-arrived unauthorized workers, rising State minimum wages, and new requirements to pay overtime wages to some farm workers. Rising labor costs often cause producers to adjust their production and management practices to compensate for the changing cost structure. Short-term options to meet the labor needs on farms include management changes, such as picking fields and orchards less often and introducing mechanical aids that increase worker productivity. Longer-term options include the use of more labor-saving mechanization, additional H-2A guest workers, and reducing overall domestic production.
Spectrum of positive and negative parity pentaquarks, including $SU(3)_F$ breaking
Creators: name: Abud, M.
name: Buccella, F.
name: Falcone, D.
name: Ricciardi, G.
name: Tramontano, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the spectrum of the lightest pentaquark states of both parities and compare it with the present experimental evidence for these states. We have assumed that the main role for their mass splittings is played by the chromo-magnetic interaction. We have also kept into account the $SU(3)_F$ breaking for their contribution and for the spin orbit term. The resulting pattern is in good agreement with experiment.
description: 39 pages, 8 figures
Digitale Kluft: Teilhabebarrieren für Studierende durch universitäres home learning?
Creators: name: Schmölz, Alexander
name: Geppert, Corinna
name: Barberi, Alessandro
Publisher: name: Medienimpulse
Year: 2020

description: Die Nutzung von digitalen Medien zur Teilhabe an gesellschaftlichen und wirtschaftlichen Prozessen sowie die Teilhabebarrieren und die digitale Kluft sind seit dem Aufkommen der Computertechnologie ein zentrales Phänomen sozialer (Un-)Gleichheit. Dieser Artikel gilt der Untersuchung der digitalen Kluft im Zuge der Umstellung des Studienbetriebs auf „home-learning“ an den österreichischen Universitäten Anfang März 2020. Diese notwendige Umstellung der Lehre zielte auf die Verminderung der Kontaktmöglichkeiten und damit auf die Reduzierung der Ansteckungsgefahr mit COVID-19 ab. Dieser Artikel beleuchtet – auch im Sinne partizipatorischer Fragestellungen – die Herausforderungen, denen sich Studierende in Zeiten des „home-learning“ gegenübersahen, um an der digitalen Lehre teilhaben zu können. Im Rahmen der zugrundeliegenden Studie wurde untersucht, inwieweit die universitären Maßnahmen bezüglich „home-learning“ sowie weitere (nationale) Regelungen zu Teilhabebarrieren für Studierende wurden. Im Folgenden werden die Ergebnisse dieser Befragung (n=412) unter Studierenden der Bildungswissenschaft der Universität Wien zusammengefasst. Die Ergebnisse zeigen, dass nicht so sehr der technische Zugang zu Computer und Internet hinderlich ist, sondern vielmehr die Kompetenzanforderungen bestimmter Technologien, die Organisation von Tages- und Wochenabläufen sowie des eigenen Lernens und der Umgang der Lehrenden mit der Situation. Auch steigende Kursanforderungen, der Zugang zur Bibliothek, zunehmende Betreuungspflichten und der (drohende) Verlust des Arbeitsplatzes haben die Teilnahme am „home-learning“ erheblich beeinträchtigt.
description: Medienimpulse, Bd. 58 Nr. 02 (2020): Nähe(n) und Distanz(en) in Zeiten der COVID-19-Krise
Velocity oscillations in confined channel flows of concentrated colloidal suspensions
Creators: name: Isa, Lucio
name: Besseling, Rut
name: Morozov, Alexander N.
name: Poon, Wilson C. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the pressure-driven flow of concentrated colloids confined in glass micro-channels at the single particle level using fast confocal microscopy. For channel to particle size ratios $a/\bar{D} \lesssim 30$, the flow rate of the suspended particles shows fluctuations. These turn into regular oscillations for higher confinements ($a/\bar{D} \simeq 20$). We present evidence to link these oscillations with the relative flow of solvent and particles (permeation) and the effect of confinement on shear thickening.
description: 4 pages, 6 figures
Hilbert's forgotten equation, the equivalence principle and velocity dependence of free fall
Creators: name: Berkahn, David L.
name: Chappell, James M.
name: Abbott, Derek
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences
subject: 83-02, 83C25

description: Referring to the behavior of accelerating objects in special relativity, and applying the principle of equivalence, one expects that the coordinate acceleration of point masses under gravity will be velocity dependent. Then, using the Schwarzschild solution, we analyze the similar case of masses moving on timelike geodesics, which reproduces a little known result by Hilbert from 1917, describing this dependence. We find that the relativistic correction term for the acceleration based on general relativity differs by a factor of two from the simpler acceleration arguments in flat space. As we might expect from the general theory, the velocity dependence can be removed by a suitable coordinate transformation, such as the Painlev{é}-Gullstrand coordinate system. The validity of this approach is supported by previous authors who have demonstrated vacuum solutions to general relativity producing true flat space metrics for uniform gravitational fields. We suggest explicit experiments could be undertaken to test the property of velocity dependence.
description: 14 pages, no figures
Exact entanglement renormalization for string-net models
Creators: name: Koenig, Robert
name: Reichardt, Ben W.
name: Vidal, Guifre
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We construct an explicit renormalization group (RG) transformation for Levin and Wen's string-net models on a hexagonal lattice. The transformation leaves invariant the ground-state "fixed-point" wave function of the string-net condensed phase. Our construction also produces an exact representation of the wave function in terms of the multi-scale entanglement renormalization ansatz (MERA). This sets the stage for efficient numerical simulations of string-net models using MERA algorithms. It also provides an explicit quantum circuit to prepare the string-net ground-state wave function using a quantum computer.
description: 7 pages, 3 figures, v2: updated to match published version
OSSOS. XXIII. 2013 VZ70 and the Temporary Coorbitals of the Giant Planet
Creators: name: Alexandersen, Mike
name: Greenstreet, Sarah
name: Gladman, Brett J.
name: Bannister, Michele T.
name: Chen, Ying-Tung
name: Gwyn, Stephen D. J.
name: Kavelaars, JJ
name: Petit, Jean-Marc
name: Volk, Kathryn
name: Lehner, Matthew J.
name: Wang, Shiang-Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the discovery of 2013 VZ70, the first known horseshoe coorbital companion of Saturn. Observed by the Outer Solar System Origins Survey (OSSOS) for 4.5 years, the orbit of 2013 VZ70 is determined to high precision, revealing that it currently is in `horseshoe' libration with the planet. This coorbital motion will last at least thousands of years but ends ~10 kyr from now; 2013 VZ70 is thus another example of the already-known `transient coorbital' populations of the giant planets, with this being the first known prograde example for Saturn (temporary retrograde coorbitals are known for Jupiter and Saturn). We present a theoretical steady state model of the scattering population of trans-Neptunian origin in the giant planet region (2--34 au), including the temporary coorbital populations of the four giant planets. We expose this model to observational biases using survey simulations in order to compare the model to the real detections made by a set of well-characterized outer Solar System surveys. While the observed number of coorbitals relative to the scattering population is higher than predicted, we show that the number of observed transient coorbitals of each giant planet relative to each other is consistent with a transneptunian source.
description: 27 pages (double-line spaced manuscript format), 4 figures, 3 tables. Published in The Planetary Science Journal, 2:212 (11pp), 2021 October. Open Access journal article available at https://iopscience.iop.org/article/10.3847/PSJ/ac1c6b
title: Εκτίμηση σεισμικής διακινδύνευσης κτιρίων οπλισμένου σκυροδέματος
title: Seismic risk assessment of reinforced concrete buildings
titleType: AlternativeTitle
Creators: name: Καμπακάκης, Σταύρος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Τρωτότητα κατασκευών
Σεισμική τρωτότητα
Στοχευόμενη μετακίνηση
Φάσμα σχεδιασμού
Οπλισμένο σκυρόδεμα

description: Στην διπλωματική αυτή θα εκτιμηθεί η σεισμική τρωτότητα και διακινδύνευση χαρακτηριστικών κτιρίων για διάφορες εντάσεις σεισμικής διέγερσης. Θα επιλεχθούν διάφορες εντάσεις σεισμικής έντασης, διάφοροι τύποι κτιρίων οπλισμένου σκυροδέματος που αποτελούν τους επικρατέστερους τύπους κατασκευής σε μια περιοχή με σεισμό και αποτελούνται από 3 τάξεις όσων αφορά το ύψος, χαμηλού, μέσου και μεγάλου (Low-Rise, Mid-Rise, High-Rise - L, M, H) και από 3 ζώνες σεισμικής επικινδυνότητας I, II, III και τέλος από 3 τάξεις όσων αφορά την κατηγορία πλαστιμότητάς του ΚΠΧ (DCL), ΚΠΜ (DCM), ΚΠΥ (DCH) και ΚΠ0 (DCZ) σε αύξουσα σειρά, δηλαδή κατηγορίες κτηρίων ανάλογα με την περίοδο κατασκευής τους. Η εκτίμηση της τρωτότητας έναντι σεισμού συμβάλλει στην εκτίμηση των σεισμικών βλαβών και τη διαχείριση κινδύνων, με στόχο την εξαγωγή των αντίστοιχων καμπυλών τρωτότητας. Οι καμπύλες τρωτότητας εκτιμώνται ως μια συνάρτηση της μέγιστης επιτάχυνσης στο βραχώδες υπόβαθρο για τέσσερις στάθμες βλάβης που είναι α) άμεση χρήση β) περιορισμένες βλάβες γ) σημαντικές βλάβες δ) οιονεί κατάρρευση σε συνάρτηση με την στοχευόμενη μετακίνηση των κτιρίων. Χρησιμοποιούνται οι σχέσεις εξασθένισης νέας γενιάς NGA-West για να κατασκευασθούν συνολικά 240 φάσματα σχεδιασμού για διάφορες παραμέτρους, όπως η μέγιστη εδαφική επιτάχυνση, η κατηγορία εδάφους, τύπος ρήγματος, ένταση σεισμού κτλπ και 90 κτίρια τα οποία χαρακτηρίζονται από τυπικές καμπύλες ικανότητας, και για τα οποία κατασκευάζονται 90 καμπύλες τρωτότητας. Για κάθε κτίριο υπολογίζονται 240 στοχευόμενες μετακινήσεις (συνολικά για όλα τα κτίρια 90*240 = 21600 στοχευόμενες μετακινήσεις) χρησιμοποιώντας ως απαίτηση καθένα από τα 240 φάσματα.
{Spin polarization tuning in Mn$_{x}$Fe$_{1-x}$Ge$_{3}$
Creators: name: Stroppa, A.
name: Kresse, G.
name: Continenza, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Experimentally, the intermetallic compound Mn$_{4}$FeGe$_{3}$ has been recently shown to exhibit enhanced magnetic properties and spin polarization compared to the Mn$_{5}$Ge$_{3}$ parent compound. The present {\em ab-initio} study focusses on the effect of Fe substitution on the electronic and magnetic properties of the compound. Our calculations reveal that the changes on the Fermi surface of the doped compound are remarkable and provide explanations for the enhanced spin-polarization observed. Finally, we show that it is indeed possible to tune the degree of spin-polarization upon Fe doping, thus making the Mn$_{1-x}$Fe$_{x}$Ge$_{3}$ intermetallic alloy very promising for future spintronic applications.
description: 8 pages, 1 fig
The ABCDEFG of Little Strings
Creators: name: Haouzi, Nathan
name: Kozçaz, Can
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Starting from type IIB string theory on an $ADE$ singularity, the $(2,0)$ little string arises when one takes the string coupling $g_s$ to 0. In this setup, we give a unified description of the codimension-two defects of the little string, labeled by a simple Lie algebra ${\mathfrak{g}}$. Geometrically, these are D5 branes wrapping 2-cycles of the singularity, subject to a certain folding operation when the algebra is non simply-laced. Equivalently, the defects are specified by a certain set of weights of $^L {\mathfrak{g}}$, the Langlands dual of ${\mathfrak{g}}$. As a first application, we show that the instanton partition function of the ${\mathfrak{g}}$-type quiver gauge theory on the defect is equal to a 3-point conformal block of the ${\mathfrak{g}}$-type deformed Toda theory in the Coulomb gas formalism. As a second application, we argue that in the $(2,0)$ CFT limit, the Coulomb branch of the defects flows to a nilpotent orbit of ${\mathfrak{g}}$.
description: 63 pages + 12 figures; v2: corrected typos and added references
Low-Income and Low-Foodstore-Access Census Tracts, 2015–19
Creators: name: Rhone, Alana
name: Williams, Ryan
name: Dicken, Christopher
name: Rhone, Alana
name: Williams, Ryan
name: Dicken, Christopher
Publisher: name: Unknown
Year: 2022
Subjects: subject: Food Security and Poverty
subject: Supermarkets
subject: grocery stores
subject: low income
subject: food access

description: This report updates estimates of low-income and low-foodstore-access census tracts, listed in the USDA, Economic Research Service’s Food Access Research Atlas, using a 2019 directory of foodstores and 2014–18 American Community Survey data on household vehicle access and family income.
The young Galactic star cluster [DBS2003]179
Creators: name: Borissova, J.
name: Ivanov, V. D.
name: Hanson, M. M.
name: Georgiev, L.
name: Minniti, D.
name: Kurtev, R.
name: Geisler, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent near- and mid-infrared surveys have brought evidence that the Milky Way continues to form massive clusters. We carry out a program to determine the basic physical properties of the new massive cluster candidate [DBS2003]179. Medium-resolution K-band spectra and deep near-infrared images of [DBS2003]179 were used to derive the spectral types of eight member stars, and to estimate the distance and reddening to the cluster. Seven of ten stars with spectra show emission lines. Comparison with template spectra indicated that they are early O-type stars. The mean radial velocity of the cluster is Vrad=-77+-6 km/s. Knowing the spectral types of the members and the color excesses, we determined extinction Av~16.6 and distance modulus (m-M)0~14.5 mag (D~7.9 kpc). The presence of early O-stars and a lack of red supergiants suggests a cluster age of 2-5Myr. The total cluster mass is approximated to 0.7x10^4 Msun and it is not yet dynamically relaxed. The candidate [DBS2003]179 further increases the family of the massive young clusters in the Galaxy, although it appears less massive than the prototypical starburst clusters.
description: 10 pages, 10 figures, accepted for publication in Astronomy and Astrophysics