cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
Creators: name: Offringa, A. R.
name: McKinley, B.
name: Hurley-Walker, N.
name: Briggs, F. H.
name: Wayth, R. B.
name: Kaplan, D. L.
name: Bell, M. E.
name: Feng, L.
name: Neben, A. R.
name: Hughes, J. D.
name: Rhee, J.
name: Murphy, T.
name: Bhat, N. D. R.
name: Bernardi, G.
name: Bowman, J. D.
name: Cappallo, R. J.
name: Corey, B. E.
name: Deshpande, A. A.
name: Emrich, D.
name: Ewall-Wice, A.
name: Gaensler, B. M.
name: Goeke, R.
name: Greenhill, L. J.
name: Hazelton, B. J.
name: Hindson, L.
name: Johnston-Hollitt, M.
name: Jacobs, D. C.
name: Kasper, J. C.
name: Kratzenberg, E.
name: Lenc, E.
name: Lonsdale, C. J.
name: Lynch, M. J.
name: McWhirter, S. R.
name: Mitchell, D. A.
name: Morales, M. F.
name: Morgan, E.
name: Kudryavtseva, N.
name: Oberoi, D.
name: Ord, S. M.
name: Pindor, B.
name: Procopio, P.
name: Prabu, T.
name: Riding, J.
name: Roshi, D. A.
name: Shankar, N. Udaya
name: Srivani, K. S.
name: Subrahmanyan, R.
name: Tingay, S. J.
name: Waterson, M.
name: Webster, R. L.
name: Whitney, A. R.
name: Williams, A.
name: Williams, C. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Astronomical widefield imaging of interferometric radio data is computationally expensive, especially for the large data volumes created by modern non-coplanar many-element arrays. We present a new widefield interferometric imager that uses the w-stacking algorithm and can make use of the w-snapshot algorithm. The performance dependencies of CASA's w-projection and our new imager are analysed and analytical functions are derived that describe the required computing cost for both imagers. On data from the Murchison Widefield Array, we find our new method to be an order of magnitude faster than w-projection, as well as being capable of full-sky imaging at full resolution and with correct polarisation correction. We predict the computing costs for several other arrays and estimate that our imager is a factor of 2-12 faster, depending on the array configuration. We estimate the computing cost for imaging the low-frequency Square-Kilometre Array observations to be 60 PetaFLOPS with current techniques. We find that combining w-stacking with the w-snapshot algorithm does not significantly improve computing requirements over pure w-stacking. The source code of our new imager is publicly released.
description: Accepted for publication in MNRAS
A topological approximation of the nonlinear Anderson model
Creators: name: Milovanov, Alexander V.
name: Iomin, Alexander
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study the phenomena of Anderson localization in the presence of nonlinear interaction on a lattice. A class of nonlinear Schrodinger models with arbitrary power nonlinearity is analyzed. We conceive the various regimes of behavior, depending on the topology of resonance-overlap in phase space, ranging from a fully developed chaos involving Levy flights to pseudochaotic dynamics at the onset of delocalization. It is demonstrated that quadratic nonlinearity plays a dynamically very distinguished role in that it is the only type of power nonlinearity permitting an abrupt localization-delocalization transition with unlimited spreading already at the delocalization border. We describe this localization-delocalization transition as a percolation transition on a Cayley tree. It is found in vicinity of the criticality that the spreading of the wave field is subdiffusive in the limit t\rightarrow+\infty. The second moment grows with time as a powerlaw t^α, with α= 1/3. Also we find for superquadratic nonlinearity that the analog pseudochaotic regime at the edge of chaos is self-controlling in that it has feedback on the topology of the structure on which the transport processes concentrate. Then the system automatically (without tuning of parameters) develops its percolation point. We classify this type of behavior in terms of self-organized criticality dynamics in Hilbert space. For subquadratic nonlinearities, the behavior is shown to be sensitive to details of definition of the nonlinear term. A transport model is proposed based on modified nonlinearity, using the idea of stripes propagating the wave process to large distances. Theoretical investigations, presented here, are the basis for consistency analysis of the different localization-delocalization patterns in systems with many coupled degrees of freedom in association with the asymptotic properties of the transport.
description: 20 pages, 2 figures; improved text with revisions; accepted for publication in Physical Review E
Capacity Lower Bounds via Productization
Creators: name: Gurvits, Leonid
name: Leake, Jonathan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We give a sharp lower bound on the capacity of a real stable polynomial, depending only on the value of its gradient at $x = 1$. This result implies a sharp improvement to a similar inequality proved by Linial-Samorodnitsky-Wigderson in 2000, which was crucial to the analysis of their permanent approximation algorithm. Such inequalities have played an important role in the recent work on operator scaling and its generalizations and applications, and in fact we use our bound to construct a new scaling algorithm for real stable polynomials. In addition, we give a strong improvement on previous lower bounds of the capacity of a non-homogeneous real stable polynomial, depending only on the value of its gradient at $x = 1$. Crucially, this new bound is independent of the degree of the polynomial, and has singly exponential dependence on the number of variables. This compares favorably to the bounds used recently in the fantastic work of Karlin-Klein-Oveis Gharan to give an improved approximation factor for metric TSP, where this dependence is doubly exponential. Such bounds were conjectured to exist by the authors, and thus our new bound should imply further improvement to the approximation factor for metric TSP. The new technique we develop to prove this bound is productization, which says that any real stable polynomial can be approximated at any point in the positive orthant by a product of linear forms. Beyond the results of this paper, our main hope is that this new technique will allow us to avoid "frightening technicalities", in the words of Laurent and Schrijver, that often accompany combinatorial lower bounds.
description: STOC 2021; this version has a new and improved bound which should imply improvements to the metric TSP results of Karlin-Klein-Oveis Gharan
title: Ultrasonographic Assessment of Gastrointestinal Tract Disorders in a Pediatric Emergency: Iconografhic Essay and Literature Review
Creators: name: Villas Bôas, Rafaela
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Parasites
subject: Inflammation
subject: Hernia
subject: Radiation safety
subject: Ultrasound-Power Doppler
subject: Ultrasound
subject: Paediatric
subject: Gastrointestinal tract
subject: Emergency

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: To describe the normal ultrasonographic imaging features of the gastrointestinal (GI) tract. To review the main inflammatory, infectious and obstructive disorders of the gastrointestinal tract in the context of a pediatric emergency. To illustrate...
Mechanical instability at finite temperature
Creators: name: Mao, Xiaoming
name: Souslov, Anton
name: Mendoza, Carlos I.
name: Lubensky, T. C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Many physical systems including lattices near structural phase transitions, glasses, jammed solids, and bio-polymer gels have coordination numbers that place them at the edge of mechanical instability. Their properties are determined by an interplay between soft mechanical modes and thermal fluctuations. In this paper we investigate a simple square-lattice model with a $ϕ^4$ potential between next-nearest-neighbor sites whose quadratic coefficient $κ$ can be tuned from positive negative. We show that its zero-temperature ground state for $κ<0$ is highly degenerate, and we use analytical techniques and simulation to explore its finite temperature properties. We show that a unique rhombic ground state is entropically favored at nonzero temperature at $κ<0$ and that the existence of a subextensive number of "floppy" modes whose frequencies vanish at $κ= 0$ leads to singular contributions to the free energy that render the square-to-rhombic transition first order and lead to power-law behavior of the shear modulus as a function of temperature. We expect our study to provide a general framework for the study of finite-temperature mechanical and phase behavior of other systems with a large number of floppy modes.
description: 15 pages, 5 figures
CES 2022 Unveils a Glimpse of the Future
Creators: name: Leocadio, Paulo
Publisher: name: figshare
Year: 2022
Subjects: classificationCode: 400699
subject: Communications engineering not elsewhere classified

description: “CES is the Global Stage for Innovation” (Consumer Technology Association - CTA, 2022) states the Consumer Technology Association (CTA) in their own words in the CES website introductory page. The Consumer Electronics Show (CES) started in 1967 with its first installment in New York City to allegedly become “the most influential tech event in the world” (Consumer Technology Association - CTA, 2022). Each year CES features manufacturers, vendors and suppliers of a wide variety technology devices and content for consumers. CES 2022 took place in Las Vegas, NV (United States of America), giving access to a global audience to start-ups and major brands, with the participation of several of the world’s most influential leaders. The event presented over 2300 companies during the exhibition (Consumer Technology Association - CTA, 2021). Owned by the Consumer Technology Association (CTA), the CES proposed for this year’s event a look into the future of smart home, vehicle technologies, and start-ups, and revolved around the metaverse, sustainability and repairability, automotive, wellness and home, and NFTs. (Consumer Technology Association - CTA, 2022). Showcasing current (or soon to be available) product releases, CES 2022 brought new technologies allowing attendees to have a glimpse of the future of technologies for the consumer. Still feeling the impacts of the global pandemic, even with late minute cancellations from important exhibitors, press representative, and the general audience, the show was further enabled by long distance remote communication tools, making sure the content was fully delivered as planned (Cervantes, 2022).
title: Ποιοτικά και ποσοτικά κριτήρια για τη βιώσιμη ανάπτυξη των ορεινών παραδοσιακών οικισμών
titleType: AlternativeTitle
Creators: name: Τσιλιμίγκας, Γιώργος
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΚΟΙΝΩΝΙΟΛΟΓΙΑ, ΑΓΡΟΤΙΚΗ -- ΕΛΛΑΔΑ -- ΖΑΓΟΡΙ
subject: ΟΙΚΙΣΜΟΙ -- ΕΛΛΑΔΑ -- ΖΑΓΟΡΙ

description: Παρατηρήσεις έκδοσης: λείπει η σελίδα 19 από το φυσικό τεκμήριο.
description: Η προβληματική της διατριβής εγγράφεται στο συνολικότερο ενδιαφέρον που εμφανίζεται για τον ορεινό χώρο σε εθνικό, ευρωπαϊκό και παγκόσμιο επίπεδο την τελευταία περίοδο. Στο 13° κεφάλαιο της Agenda 21 προσδιορίζονται ουσιαστικά οι κύριοι άξονες προβληματικής σε πλανητικό επίπεδο και αποδίδεται ο νέος ρόλος που καλείται να διαδραματίσει ο ορεινός χώρος. Η ανάγκη για συνολικότερη διερεύνηση των ορεινών περιοχών του πλανήτη και του ρόλου τους στην ανάπτυξη εκφράσθηκε στο πλαίσιο της ανακήρυξης του έτους 2002 ως έτους αφιερωμένου στα βουνά, όπου ένας σημαντικός αριθμός συναντήσεων, διασκέψεων και τοποθετήσεων επιχείρησαν να εμπλουτίσουν την προβληματική για τον ορεινό χώρο. Στο πλαίσιο της διατριβής επιχειρείται να προσδιοριστεί με ποιοτικά και ποσοτικά κριτήρια η βιωσιμότητα της ανάπτυξης των ορεινών παραδοσιακών οικισμών του Ζαγορίου, που συνιστά χαρακτηριστική περίπτωση για τον ελλαδικό χώρο. Τα Ζαγόρια της Ηπείρου αποτελούν ένα σύστημα παραδοσιακών οικισμών ιδιαίτερης αισθητικής και πολιτιστικής αξίας. Η νέα οικονομία και οι νέες κοινωνικές δυναμικές που αναπτύσσονται στον ορεινό αγροτικό χώρο, τείνουν να διαταράξουν την «ισορροπία» που τον χαρακτήριζε τις τελευταίες δεκαετίες, περίοδο κατά την οποία ουσιαστικά ο ρόλος του είχε περιοριστεί στη γεωργική και κτηνοτροφική παραγωγή. Στη δεκαετία του '80 μπορούμε να διακρίνουμε την εμφάνιση μιας νέας δυναμικής για την «αξιοποίηση» των παραδοσιακών οικισμών του Ζαγορίου, συμβάλλοντας στην ανάπτυξη και άλλων παραγωγικών δραστηριοτήτων, κυρίως του τριτογενούς τομέα της οικονομίας. Ζητούμενο της τοπικής ανάπτυξης αποτελεί πώς οι νέες κοινωνικό-οικονομικές αλλαγές που συντελούνται δε θα αποτελόσουν παράγοντα υποβάθμισης της φυσικής και πολιτιστικής κληρονομιάς, κίνδυνος που ελλοχεύει είτε λόγω της εντατικής εκμετάλλευσης των παραδοσιακών δομών είτε λόγω της εγκατάλειψης παραδοσιακών δραστηριοτήτων, οι οποίες είναι λιγότερο αποδοτικές οικονομικά σε σχέση με τις νέες παραγωγικές δραστηριότητες όπως αναπτύσσονται.
Automatic Removal of Marginal Annotations in Printed Text Document
Creators: name: Elboushaki, Abdessamad
name: Hannane, Rachida
name: Nagabhushan, P.
name: Javed, Mohammed
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Recovering the original printed texts from a document with added handwritten annotations in the marginal area is one of the challenging problems, especially when the original document is not available. Therefore, this paper aims at salvaging automatically the original document from the annotated document by detecting and removing any handwritten annotations that appear in the marginal area of the document without any loss of information. Here a two stage algorithm is proposed, where in the first stage due to approximate marginal boundary detection with horizontal and vertical projection profiles, all of the marginal annotations along with some part of the original printed text that may appear very close to the marginal boundary are removed. Therefore as a second stage, using the connected components, a strategy is applied to bring back the printed text components cropped during the first stage. The proposed method is validated using a dataset of 50 documents having complex handwritten annotations, which gives an overall accuracy of 89.01% in removing the marginal annotations and 97.74% in case of retrieving the original printed text document.
description: Original Article Published by Elsevier at ERCICA-2014, Pages 123-131, August 2014
Deep Learning Gauss-Manin Connections
Creators: name: Heal, Kathryn
name: Kulkarni, Avinash
name: Sertöz, Emre Can
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 32J25, 14Q10, 14C22, 32G20, 68T07

description: The Gauss-Manin connection of a family of hypersurfaces governs the change of the period matrix along the family. This connection can be complicated even when the equations defining the family look simple. When this is the case, it is computationally expensive to compute the period matrices of varieties in the family via homotopy continuation. We train neural networks that can quickly and reliably guess the complexity of the Gauss-Manin connection of a pencil of hypersurfaces. As an application, we compute the periods of 96% of smooth quartic surfaces in projective 3-space whose defining equation is a sum of five monomials; from the periods of these quartic surfaces, we extract their Picard numbers and the endomorphism fields of their transcendental lattices.
description: 30 pages
title: Musculoskeletal manifestations of hematolymphoid malignancies
Creators: name: Udare, Amar
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Musculoskeletal bone
subject: Musculoskeletal system
subject: Haematologic
subject: MR
subject: Diagnostic procedure
subject: Haematologic diseases

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: Study imaging appearances of normal bone marrow maturation pattern. Study the musculoskeletal manifestations of malignant hematolymphoid conditions. Study imaging appearances of post-treatment changes in patients with hematolymphoid...
Hundred-thousand light holes push nanoscopy to go parallel
Creators: name: Chen, Xuanze
name: Xi, Peng
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The recent work by Chmyrov et al. (Nature Methods 2013) presents a capstone for the current major super-resolution microscopy techniques. In optical super-resolution microscopy, two pathways are commonly taken: targeted illumination modulation, or stochastic single-molecule localization. Incoherent cross-standing microscopy has utilized the concept of structured illumination in generating patterns, to generate effective 100,000 "doughnuts" as with STED; and used the photo-switchable dye to decrease the requirement of modulation intensity. It has combined the key elements of all these major super-resolution techniques.
description: 6 pages, 1 figure
title: Adenocarcinoma of the lung today: spectrum of disease with radiological-pathological correlation, diagnostic management and prognostic implications.
Creators: name: Gutiérrez Gimeno, Manuel
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Pathology
subject: Neoplasia
subject: Diagnostic procedure
subject: CT
subject: Thorax
subject: Oncology

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: • To set out the different tumour subtypes encompassed within the spectrum of “lung adenocarcinoma” (pre-malignant and malignant). • To define their main histological and radiological features. • To describe the diagnostic work-up. • To...
The Additive Effects of Bilingualism on Third or Additional Language Acquisition: the Role of Metalinguistic Awareness
Creators: name: D’Angelo, Francesca
Publisher: name: Universita degli studi di Salerno
Year: 2019
Subjects: subject: L-LIN/02 DIDATTICA DELLE LINGUE MODERNE
subject: Bilingualism
subject: Language acquisition
subject: Metalinguistic awareness

description: 2016 - 2017
description: La ricerca condotta sugli effetti del bilinguismo sullo sviluppo cognitivo e metalinguistico può essere suddivisa in due diverse fasi che ne attestano i vantaggi e gli svantaggi. La fase additiva inizia nel 1962, anno di pubblicazione dell’opera più influente sul bilinguismo. Il contributo di Peal e Lambert, The Relation of Bilingualism to Intelligence, apre la strada ad una serie di importanti studi che mettono in dubbio la validità scientifica di ricerche precedenti che sostenevano gli effetti negativi del bilinguismo. Attualmente, la visione comune condivisa da accademici di diversi ambiti, tra cui linguistica applicata, psicolinguistica e didattica delle lingue straniere, è che il bilinguismo migliora lo sviluppo cognitivo e le abilità metalinguistiche. .. [a cura dell'Autore]
description: The research conducted on the general effects of bilingualism on cognitive and metalinguistic development can be divided into two different phases demonstrating, respectively, its negative and positive effects. The “additive effects” phase started in 1962, when the most influential work on bilingualism was published. Peal and Lambert’s contribution (1962), The Relation of Bilingualism to Intelligence, paved the way to a number of important studies questioning the validity of previous research focused on bilingual disadvantages. Currently, the general view shared by academics in different fields including applied linguistics, psycholinguistics and foreign language education is that bilingualism fosters cognitive development and metalinguistic abilities. .. [edited by Author]
Resolving the spacetime structure of jets with medium
Creators: name: Takacs, Adam
name: Pablos, Daniel
name: Tywoniuk, Konrad
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Away from the strictly soft and collinear limit of QCD radiation the choice of evolution scale in a parton shower algorithm is ambiguous and several options have been implemented in existing Monte Carlo event generators for proton-proton collisions. However, the resulting space-time evolution could result in subtle differences depending on the particular choice. In this work we quantify measurable consequences of the choice of the evolution variable and show how the implications of such a choice propagates into jet quenching observables. We develop a parton shower algorithm for a general evolution variable, that includes as special cases the virtuality, angle, transverse momentum and formation time. We study the interplay between the shower history for different evolution variables and the phase space affected by parton energy loss. In particular, we implement effects of jet quenching in the dense limit and highlight the role of color coherence effects. We compare the results of the different ordering variables to existing Monte Carlo shower implementations on the parton level by analyzing primary Lund planes. Finally, we study the sensitivity of quenched jets to the choice of evolution variable by confronting our results for a certain key observable, such as the jet mass.
description: 5 pages, 4 figures, 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2020)
title: Πειραματική διερεύνηση οριζόντιων κυκλικών και μη αξονοσυμμετρικών ανωστικών φλεβών, σε ομογενή ακίνητο αποδέκτη
titleType: AlternativeTitle
Creators: name: Μίχας, Σπυρίδων Ν.
Publisher: name: University of Thessaly
Year: 2008
Subjects: subject: ΡΕΥΣΤΟΔΥΝΑΜΙΚΗ
subject: ΤΥΡΒΩΔΗΣ ΡΟΗ -- ΜΑΘΗΜΑΤΙΚΑ ΜΟΝΤΕΛΑ

description: Αν και η εφαρμογή οριζόντιων φλεβών για τη διάθεση θερμικών αποβλήτων (π.χ. νερού ψύξης) είναι αρκετά διαδεδομένη, υπάρχει περιορισμένος αριθμός εργασιών στη διεθνή βιβλιογραφία, που κατά κύριο λόγο βασίζονται περισσότερο στην περιγραφή της τροχιάς των φλεβών παρά στα τυρβώδη χαρακτηριστικά της. Στην παρούσα διατριβή μελετώνται πειραματικά οριζόντιες τυρβώδεις ανωστικές φλέβες που διαχέονται σε ήρεμο ομογενή αποδέκτη. Πραγματοποιήθηκαν πειράματα με φλέβες αλατόνερου και με θερμαινόμενες φλέβες. Για την κατάρτιση των τροχιών εφαρμόστηκε τεχνική σκιαγραφήματος με διπλό κάνναβο και τεχνικές LIF (Laser Induced Fluorescence). Πραγματοποιήθηκαν επίσης μετρήσεις θερμοκρασίας και υπολογισμός χαρακτηριστικών της τύρβης με τη χρήση αισθητήρων θερμοκρασίας ταχείας απόκρισης, καθώς και με τεχνικές LIF. Τα αποτελέσματα των πειραματικών μετρήσεων συγκρίθηκαν μεταξύ τους καθώς και με τα αποτελέσματα από την εφαρμογή μονοδιάστατων μαθηματικών ομοιωμάτων. Η εφαρμογή των διαφορετικών τεχνικών οπτικοποίησης της ροής έδειξε σημαντικά πλεονεκτήματα της χρήσης LIF. Από τις τροχιές των φλεβών διαπιστώθηκε ότι οι θερμαινόμενες φλέβες διανύουν μεγαλύτερες αποστάσεις σε σύγκριση με τις φλέβες αλατόνερου, για κοινές αρχικές συνθήκες, λόγω μη διατήρησης της αρχικής ανωστικής δύναμης στις θερμαινόμενες φλέβες. Διαπιστώθηκε επίσης ότι οι αδιάστατες τροχιές των φλεβών τείνουν να συμπέσουν, όσο η ροή έχει τα χαρακτηριστικά απλής φλέβας (jet), δηλαδή όσο μειώνεται ο αρχικός αριθμός Richardson. Τα αποτελέσματα επαληθεύτηκαν με την εφαρμογή μαθηματικού ομοιώματος, καθώς και με σύγκριση των οπτικών τροχιών και των τροχιών από τις μετρήσεις θερμοκρασίας. Από τα διαγράμματα μέσων τιμών, εντάσεων τύρβης και των λοιπών στατιστικών χαρακτηριστικών της τύρβης, διαπιστώθηκαν γενικές ομοιότητες και συνέπεια με αντίστοιχα στοιχεία από κατακόρυφες φλέβες. Η σημαντικότερη διαφορά είναι η ασυμμετρία που εισάγει η οριζόντια διεύθυνση της ροής, και η οποία είναι εμφανής σε όλες τις κατανομές. Εξετάστηκε επίσης η μεταβολή του πλάτους της φλέβας, καθώς και η μέση αραίωση στον άξονα. Από την ανάλυση των πειραματικών δεδομένων δεν διαπιστώθηκε κάποια σημαντική διαφοροποίηση στα χαρακτηριστικά ανάμειξης μεταξύ φλεβών από αξονοσυμμετρικά και μη αξονοσυμμετρικά ακροφύσια. Τέλος, με την απεικόνιση εγκάρσιων τομών φλεβών που έγινε με LIF, διαπιστώθηκε ότι ανεξάρτητα από το σχήμα του ακροφυσίου, η διατομή μιας μη αξονοσυμμετρικής οριζόντιας φλέβας μεταπίπτει σε κυκλική σε πολύ μικρή απόσταση από το ακροφύσιο.
title: Diagnostic challenges in incidental pediatric abdominal masses: a rational radiologic approach
Creators: name: Flores Quispe, Silvia Karem Janet
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Neoplasia
subject: Cysts
subject: Congenital
subject: Barium meal
subject: Barium enema
subject: Ultrasound
subject: MR
subject: CT
subject: Paediatric
subject: Oncology
subject: Abdomen

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: Prompt diagnosis of an abdominal mass in a child is often a diagnostic challenge of imaging. Prerequisites to a rational radiological approach are: the knowledge of the patient’s age, sex, history and clinical findings the proper use of different...
title: The Decline and Conservation Status of North American Bumble Bees
Creators: name: Koch, Jonathan Berenguer
Publisher: name: Utah State University
Year: 2011

description: Several reports of North American bumble bee (Bombus Latreille) decline have been documented across the continent, but no study has fully assessed the geographic scope of decline. In this study I discuss the importance of Natural History Collections (NHC) in estimating historic bumble bee distributions and abundances, as well as in informing current surveys. To estimate changes in distribution and relative abundance I compare historic data assembled from a >73,000 specimen database with a contemporary 3-year survey of North American bumble bees across 382 locations in the contiguous U.S.A. Based on my results, four historically abundant bumble bees, B. affinis, B. occidentalis, B. pensylvanicus and B. terricola, have declined by 72 - 96% relative abundance across their native distribution, while B. bifarius, B. bimaculatus, B. impatiens, and B. vosnesenskii appear to be relatively stable. Finally, I provide some notes on the distribution, abundance, and frequency of Nosema bombi infections in Alaskan B. occidentalis.
On Coercivity and the Frequency Domain Condition in Indefinite LQ-Control
Creators: name: Damm, Tobias
name: Jacob, Birgit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 93C80, 49N10, 15A24, 93E03

description: We introduce a coercivity condition as a time domain analogue of the frequency criterion provided by the famous Kalman-Yakubovich-Popov lemma. For a simple stochastic linear quadratic control problem we show how the coercivity condition characterizes the solvability of Riccati equations.
description: 11 pages
title: Η γερμανική μεταρρυθμιστική παιδαγωγική και οι επιδράσεις της στην ελληνική εκπαίδευση κατά τις πρώτες δεκαετίες του 20ου αιώνα
titleType: AlternativeTitle
Creators: name: Κοντομήτρος, Γεώργιος Α.
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΕΚΠΑΙΔΕΥΣΗ – ΕΛΛΑΔΑ – 20ος αιώνας
subject: ΕΚΠΑΙΔΕΥΤΙΚΑ ΣΥΣΤΗΜΑΤΑ -- ΓΕΡΜΑΝΙΑ

description: Στην εργασία αυτή επιχειρείται η διερεύνηση της επίδρασης που άσκησε η γερμανική Μεταρρυθμιστική Παιδαγωγική στην ελληνική εκπαίδευση κατά τις πρώτες δεκαετίες του 20ου αιώνα. Εξετάζεται διεξοδικά η εμφάνιση του παιδαγωγικού αυτού ρεύματος στη Γερμανία και στη συνέχεια ερευνάται η επίδρασή του στην ελληνική πραγματικότητα κυρίως μέσω των Ελλήνων παιδαγωγών, οι οποίοι σπούδασαν Παιδαγωγική στη Γερμανία κατά το ίδιο χρονικό διάστημα. Η ανίχνευση της επίδρασης αυτής αποσκοπεί στην κατανόηση της πορείας που ακολούθησαν τα ελληνικά εκπαιδευτικά πράγματα κατά τη σημαντική αυτή ιστορική περίοδο, ώστε να δοθούν ερεθίσματα για την πληρέστερη ερμηνεία της μεταγενέστερης ελληνικής εκπαιδευτικής πραγματικότητας και για ένα ασφαλέστερο σχεδιασμό της μελλοντικής της πορείας.
The importance of Big Data: US Internal Revenue Service
Creators: name: Leocadio, Paulo
Publisher: name: figshare
Year: 2022
Subjects: classificationCode: 460308
subject: Pattern recognition
classificationCode: 460502
subject: Data mining and knowledge discovery
classificationCode: 461008
subject: Organisation of information and knowledge resources
classificationCode: 461305
subject: Data structures and algorithms
classificationCode: 460503
subject: Data models, storage and indexing

description:
 In the Internet era, Big Data is a term applied to datasets overflowing the boundaries of traditional database technologies. It brings together the power of computers and repositories with some of the largest inventories of ultra-individualized information to provide insight into every aspect of modern life and human behavior. This is a world where an estimated 2.5 quintillion bytes of data are being produced every day; ninety percent (90%) of the world’s data has been created in the last two years. It is also a world where huge challenges and gigantic opportunities are created for regulators. Data scientists, policymakers, and tax experts are looking into ways of using big data mechanisms, tools, and solutions to advance the study and reform of taxation. The debate on plans for comprehensive tax reforms are currently underway by US leaders, while they gain increased access to big data analytics to inform their policies, priorities, and strategies.
New moduli of smoothness: weighted DT moduli revisited and applied
Creators: name: Kopotun, K. A.
name: Leviatan, D.
name: Shevchuk, I. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 41A10, 41A17, 41A25

description: We introduce new moduli of smoothness for functions $f\in L_p[-1,1]\cap C^{r-1}(-1,1)$, $1\le p\le\infty$, $r\ge1$, that have an $(r-1)$st locally absolutely continuous derivative in $(-1,1)$, and such that $φ^rf^{(r)}$ is in $L_p[-1,1]$, where $φ(x)=(1-x^2)^{1/2}$. These moduli are equivalent to certain weighted DT moduli, but our definition is more transparent and simpler. In addition, instead of applying these weighted moduli to weighted approximation, which was the purpose of the original DT moduli, we apply these moduli to obtain Jackson-type estimates on the approximation of functions in $L_p[-1,1]$ (no weight), by means of algebraic polynomials. Moreover, we also prove matching inverse theorems thus obtaining constructive characterization of various smoothness classes of functions via the degree of their approximation by algebraic polynomials.
description: to appear in Constructive Approximation
title: Optimization of protocols and acquisition techniques in lower limbs planar radiography
Creators: name: Devetti, Angie
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Extremities
subject: Conventional radiography
subject: Dosimetry
subject: Dosimetric comparison

description: Aims and objectives Methods and materials Results Conclusion Personal information References
description: Aims and objectives: Radiography has always been the primary tool in radiology in terms of biological and economical cost. Despite the low contribution per exam, as the number of examinations performed increases and data on the long term risks of cancer arising from...
Ultrahigh Vacuum Packaging and Surface Cleaning for Quantum Devices
Creators: name: Mergenthaler, M.
name: Paredes, S.
name: Müller, P.
name: Müller, C.
name: Filipp, S.
name: Sandberg, M.
name: Hertzberg, J.
name: Adiga, V. P.
name: Brink, M.
name: Fuhrer, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We describe design, implementation and performance of an ultra-high vacuum (UHV) package for superconducting qubit chips or other surface sensitive quantum devices. The UHV loading procedure allows for annealing, ultra-violet light irradiation, ion milling and surface passivation of quantum devices before sealing them into a measurement package. The package retains vacuum during the transfer to cryogenic temperatures by active pumping with a titanium getter layer. We characterize the treatment capabilities of the system and present measurements of flux tunable qubits with an average T$_1=84~μ$s and T$^{echo}_2=134~μ$s after vacuum-loading these samples into a bottom loading dilution refrigerator in the UHV-package.
description: 5 pages, 6 figures
title: Ανάπτυξη και μελέτη νέων υλικών κυψελίδων καυσίμου με στόχο την απευθείας χρήση της βιοαιθανόλης για παραγωγή ηλεκτρικής ενέργειας
titleType: AlternativeTitle
Creators: name: Πουλιανίτης, Κωνσταντίνος Θ.
Publisher: name: University of Thessaly
Year: 2007
Subjects: subject: ΚΕΛΙΑ ΚΑΥΣΙΜΩΝ
subject: ΗΛΕΚΤΡΙΚΗ ΕΝΕΡΓΕΙΑ -- ΠΑΡΑΓΩΓΗ

description: Οι κυψελίδες καυσίμου στερεού οξειδίου SOFCs θεωρούνται ως η περισσότερο υποσχόμενη τεχνολογία για υψηλής απόδοσης παραγωγή ηλεκτρικής ενέργειας. Η αιθανόλη θεωρείται ένα εναλλακτικό καύσιμο για τις κυψελίδες καυσίμου, φιλικό προς το περιβάλλον, με υψηλή ενεργειακή πυκνότητα που θα μπορούσε να υπερνικήσει τα προβλήματα που εμφανίζονται από την αποθήκευση και μεταφορά του υδρογόνου. Η απευθείας χρήση της αιθανόλης στο ηλεκτρόδιο της ανόδου αποτελεί σημαντικό πλεονέκτημα, όπως είναι η υψηλότερη απόδοση μέσω ανάκτησης της θερμότητας από τις χημικές αντιδράσεις, η απλοποίηση του συστήματος χωρίς τη χρήση του αναμορφωτή και η μείωση του συνολικού κόστους του συστήματος. Η πλήρης ηλεκτρο-οξείδωση της αιθανόλης αποτελεί σε διοξείδιο του άνθρακα και υδρογόνο, αποτελεί κρίσιμο ζήτημα και πραγματική πρόκληση. Στην παρούσα διατριβή, μελετήθηκε αρχικά η αναμόρφωση της αιθανόλης με υδρατμό τόσο σε καταλύτη αργύρου (Ag) όσο και λευκοχρύσου (Pt). Τα πειραματικά αποτελέσματα κατέδειξαν τη δυσκολία διάσπασης του δεσμού άνθρακα-άνθρακα στο μόριο της αιθανόλης, γεγονός το οποίο οδηγεί στον σχηματισμό ποικίλων παραπροϊόντων, όπως είναι η ακεταλδεΰδη, το μονοξείδιο του άνθρακα, το μεθάνιο, κλπ. Επιπλέον, μελετήθηκε η λειτουργία τριών διαφορετικών διατάξεων κυψελίδων καυσίμου στερεού ηλεκτρολύτη άμεσης τροφοδοσίας αιθανόλης (DE-SOFCs). Αρχικά, πραγματοποιήθηκε μελέτη των κυψελίδων καυσίμου τύπου Ag/YSZ/Ag και Pt/YSZ/Pt, ενώ στη συνέχεια κατασκευάστηκε και μελετήθηκε κυψελίδα τύπου Ni/ScCeSZ/LSM. Τέλος, μελετήθηκε η κυψελίδα PCe/YSZ/PtPr, στην οποία εξετάστηκε και η κατανομή των κύριων προϊόντων της αντίδρασης σε συνθήκες ανοικτού και κλειστού κυκλώματος. Βρέθηκε πως η μικροδομή και η επιλογή των υλικών παίζουν καθοριστικό ρόλο στην απόδοση της κυψελίδας. Σε όλες τις περιπτώσεις, τα πειραματικά αποτελέσματα έδειξαν πως η πυκνότητα ισχύος των κυψελίδων καυσίμου, ενισχύεται πάνω από τους 600°C, γεγονός το οποίο οφείλεται τόσο στη βελτιωμένη κινητική των αντιδράσεων όσο και στην υψηλότερη ιοντική αγωγιμότητα του ηλεκτρολύτη σε υψηλές θερμοκρασίες λειτουργίας. Η κυψελίδα Ni/ScCeSZ/LSM εμφάνισε τη καλύτερη συμπεριφορά συγκριτικά με τις υπόλοιπες που μελετήθηκαν, αποδίδοντας μέγιστη πυκνότητα ισχύος 114 mW/cm στους 1000°C. Για τη βελτίωση της ηλεκτροχημικής απόδοσης απαιτείται, η ανάπτυξη και μελέτη νέων δραστικότερων καταλυτών και ηλεκτρολυτών με υψηλότερη ιοντική αγωγιμότητα, καθώς και γνώση του μηχανισμού της αντίδρασης και των σχετικών κινητικών της σταθερών
title: How To Never Misdiagnose A Benign Pediatric Bone Lesion
Creators: name: El-Mossly, Dalia
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Demineralisation-Bone
subject: Cysts
subject: Diagnostic procedure
subject: MR
subject: CT
subject: Conventional radiography
subject: Paediatric
subject: Musculoskeletal bone

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: 1. Benign bone lesions are very common in children 2. Benign bone lesions may have atypical imaging features 3. Conventional radiography is main and primary imaging modality in the systematic approach for diagnosis 4. complementary CT, MRI and...
Reconstructing topological properties of complex networks using the fitness model
Creators: name: Cimini, Giulio
name: Squartini, Tiziano
name: Musmeci, Nicolò
name: Puliga, Michelangelo
name: Gabrielli, Andrea
name: Garlaschelli, Diego
name: Battiston, Stefano
name: Caldarelli, Guido
Publisher: name: arXiv
Year: 2014
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: A major problem in the study of complex socioeconomic systems is represented by privacy issues$-$that can put severe limitations on the amount of accessible information, forcing to build models on the basis of incomplete knowledge. In this paper we investigate a novel method to reconstruct global topological properties of a complex network starting from limited information. This method uses the knowledge of an intrinsic property of the nodes (indicated as fitness), and the number of connections of only a limited subset of nodes, in order to generate an ensemble of exponential random graphs that are representative of the real systems and that can be used to estimate its topological properties. Here we focus in particular on reconstructing the most basic properties that are commonly used to describe a network: density of links, assortativity, clustering. We test the method on both benchmark synthetic networks and real economic and financial systems, finding a remarkable robustness with respect to the number of nodes used for calibration. The method thus represents a valuable tool for gaining insights on privacy-protected systems.
title: Σχεδιασμός, ανάπτυξη και μελέτη νέων ηλεκτρολυτών και ηλεκτροκαταλυτών για κυψελίδες καυσίμου στερεού οξειδίου ενδιάμεσων και χαμηλών θερμοκρασιών
titleType: AlternativeTitle
Creators: name: Μαραγκού, Βασιλική
Publisher: name: University of Thessaly
Year: 2010
Subjects: subject: ΚΕΛΙΑ ΚΑΥΣΙΜΩΝ
subject: ΚΕΛΙΑ ΚΑΥΣΙΜΩΝ ΣΤΕΡΕΩΝ ΟΞΕΙΔΙΩΝ

description: Αντικείμενο μελέτης της παρούσας διδακτορικής διατριβής αποτελεί η διερεύνηση των ιδιοτήτων νέων ηλεκτρολυτικών και ηλεκτροκαταλυτικών υλικών για κυψελίδες καυσίμου στερεού οξειδίου ενδιάμεσων και χαμηλών θερμοκρασιών λειτουργίας (Intermediate and Low Temperature Solid Oxide Fuel Cells, IT & LTSOFCs). Πιο συγκεκριμένα, στο 1° Κεφάλαιο παρουσιάζονται διεξοδικά οι στόχοι και τα κίνητρα για την πραγματοποίηση της συγκεκριμένης διατριβής, ενώ στο 2° Κεφάλαιο πραγματοποιείται μία σύντομη βιβλιογραφική ανασκόπηση της έρευνας που έχει πραγματοποιηθεί τα τελευταία χρόνια στην κατεύθυνση της μείωσης της θερμοκρασίας λειτουργίας των κυψελίδων καυσίμου στερεού οξειδίου. Στο 3° Κεφάλαιο παρουσιάζονται οι πειραματικές διατάξεις και οι τεχνικές που χρησιμοποιήθηκαν για το δομικό χαρακτηρισμό και τον προσδιορισμό των ιδιοτήτων των υλικών που μελετήθηκαν, ακολουθούμενες από τα πειραματικά αποτελέσματα της παρούσας διατριβής. Στα Κεφάλαια 4 και 5 διερευνώνται οι δομικές και ηλεκτρικές ιδιότητες καινοτόμων υλικών με στόχο την εφαρμογή τους ως ηλεκτρολύτες σε κυψελίδες καυσίμου IT-SOFCs. Αρχικά, εξετάζεται η επίδραση της σαμάρειας (S1112O3) στα δομικά χαρακτηριστικά και στις ηλεκτρικές ιδιότητες του δημητρικού βαρίου (BaCeOs). Τα οξείδια τύπου BaCei_xSmx03-s τα οποία παρασκευάσθηκαν μέσω της αντίδρασης στερεός κατάστασης, παρουσιάζουν περοβσκιτική δομή με ορθορομβικές παραμορφώσεις στο εύρος των εξεταζόμενων συστάσεων (0.002 στην επιφάνεια της καθόδου BSCF και το σχηματισμό ανθρακικών ενώσεων στις χαμηλές θερμοκρασίες των 500 και 450°C. Τέλος, στο 8° Κεφάλαιο της παρούσας διδακτορικής διατριβής συνοψίζονται τα κύρια συμπεράσματα τα οποία προέκυψαν κατά τη μελέτη των προαναφερθέντων ηλεκτρολυτικών και ηλεκτροκαταλυτικών υλικών για εφαρμογή σε κυψελίδες καυσίμου στερεού οξειδίων ενδιάμεσων και χαμηλών θερμοκρασιών λειτουργίας, ενώ παρατίθενται και ορισμένες προτάσεις για μελλοντική έρευνα.
Underlying SUSY in a generalized Jaynes-Cummings model
Creators: name: Maldonado-Villamizar, F. H.
name: González-Gutiérrez, C. A.
name: Villanueva-Vergara, L.
name: Rodríguez-Lara, B. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a generalized Jaynes-Cummings model that includes but is not limited to an extensive collection of experimental and theoretical proposals from the literature. It covers nonlinear boson terms, nonlinear dispersive and multi-boson exchange interaction. Our model features an underlying Lie graded algebra symmetry reminiscent to supersymmetric quantum mechanics. This allows us to propose a diagonalization scheme and calculate its analytic time evolution. In consequence, we are able to construct closed forms for relevant observables and explore the dynamics of particular realizations of our model independent of their complexity. As an practical example, we show the evolution of the population inversion and the boson quadratures for an initial state consisting of the qubit in the ground state interacting with a coherent field for a selection of cases including the standard JC model with Stark shift, Kerr-like terms, intensity dependent coupling, multi-boson exchange and algebraic deformations.
description: 20 pages, 8 figures
Characterization and tomography of a hidden qubit
Creators: name: Pechal, M.
name: Salis, G.
name: Ganzhorn, M.
name: Egger, D. J.
name: Werninghaus, M.
name: Filipp, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In circuit-based quantum computing, the available gate set typically consists of single-qubit gates acting on each individual qubit and at least one entangling gate between pairs of qubits. In certain physical architectures, however, some qubits may be 'hidden' and lacking direct addressability through dedicated control and readout lines, for instance because of limited on-chip routing capabilities, or because the number of control lines becomes a limiting factor for many-qubit systems. In this case, no single-qubit operations can be applied to the hidden qubits and their state cannot be measured directly. Instead, they may be controlled and read out only via single-qubit operations on connected 'control' qubits and a suitable set of two-qubit gates. We first discuss the impact of such restricted control capabilities on the quantum volume of specific qubit coupling networks. We then experimentally demonstrate full control and measurement capabilities in a superconducting two-qubit device with local single-qubit control and iSWAP and controlled-phase two-qubit interactions enabled by a tunable coupler. We further introduce an iterative tune-up process required to completely characterize the gate set used for quantum process tomography and evaluate the resulting gate fidelities.
Toward the Improvement of Inclusive Education for Students With Disabilities via Online Intervention: Feasibility Randomized Controlled Trial in Australia
Creators: name: Spong, Jo
name: Iacono, Teresa
name: Garcia Melgar, Ana
name: Bagley, Kerryn
name: McKinstry, Carol
name: Hyett, Nerida
name: Arthur-Kelly, Michael
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 3901
subject: Curriculum and pedagogy
classificationCode: 3903
subject: Education systems

description: Abstract: Training key stakeholders in the design of reasonable adjustments for students with disabilities could promote collaboration and inclusion. We tested the feasibility of a randomized controlled trial to evaluate the effectiveness of online education (intervention) in designing reasonable adjustments by Victorian (Australian) parents and professionals (n = 31). Participants suggested reasonable adjustments for contrived students with varied needs to support their participation in described classroom activities. Data collected pre- and post-intervention, and, at follow-up, were rated across five dimensions: Authenticity, Agency, Real Learning, Strengths Based, and Inclusion. Analyses from 15 intervention and 14 control participants (10 parents, 10 teaching staff, and 9 allied health professionals) showed higher scores for Inclusion post-intervention for the intervention group. This difference was maintained at follow-up, generalized to a new contrived student scenario, and mostly attributable to parents. Online education may improve parents’ contribution in the design of reasonable adjustments that promote inclusion. A larger study is warranted.
title: Peripheral vascular anomalies. Diagnosis and treatment according ISSVA 2014 classification.
Creators: name: Mesa Quesada, Juan
Publisher: name: European Congress of Radiology
Year: 2018
Subjects: subject: Interventional non-vascular
subject: Musculoskeletal soft tissue
subject: Soft tissues / Skin
subject: CT-Angiography
subject: MR-Angiography
subject: Ultrasound-Colour Doppler
subject: Sclerosis
subject: Arteriovenous malformations
subject: Fistula

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: To review the new ISSVA (International Society for the Study of Vascular Anomalies) clasification on peripheral vascular anomalies. Analyze the role of imaging techniques, show the main radiological findings and describe the most appropriate...
An addressable quantum dot qubit with fault-tolerant control fidelity
Creators: name: Veldhorst, M.
name: Hwang, J. C. C.
name: Yang, C. H.
name: Leenstra, A. W.
name: de Ronde, B.
name: Dehollain, J. P.
name: Muhonen, J. T.
name: Hudson, F. E.
name: Itoh, K. M.
name: Morello, A.
name: Dzurak, A. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Exciting progress towards spin-based quantum computing has recently been made with qubits realized using nitrogen-vacancy (N-V) centers in diamond and phosphorus atoms in silicon, including the demonstration of long coherence times made possible by the presence of spin-free isotopes of carbon and silicon. However, despite promising single-atom nanotechnologies, there remain substantial challenges in coupling such qubits and addressing them individually. Conversely, lithographically defined quantum dots have an exchange coupling that can be precisely engineered, but strong coupling to noise has severely limited their dephasing times and control fidelities. Here we combine the best aspects of both spin qubit schemes and demonstrate a gate-addressable quantum dot qubit in isotopically engineered silicon with a control fidelity of 99.6%, obtained via Clifford based randomized benchmarking and consistent with that required for fault-tolerant quantum computing. This qubit has orders of magnitude improved coherence times compared with other quantum dot qubits, with T_2* = 120 mus and T_2 = 28 ms. By gate-voltage tuning of the electron g*-factor, we can Stark shift the electron spin resonance (ESR) frequency by more than 3000 times the 2.4 kHz ESR linewidth, providing a direct path to large-scale arrays of addressable high-fidelity qubits that are compatible with existing manufacturing technologies.