cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Longitudinal Angular Momentum in Magneto-Mie Scattering: Quantum Vacuum Correction to the Einstein-De Haas effect
Creators: name: van Tiggelen, B. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This work investigates the angular momentum of the electromagnetic quantum vacuum residing in a dielectric Mie sphere subject to the Faraday effect. Longitudinal electric modes are excited on its surface and are also created inside the sphere by the Faraday effect.The electromagnetic quantum vacuum creates a vortex of the Poynting vector that varies as $1/r$ to the center of the sphere and is associated with longitudinal angular momentum, connected to the vector potential $\mathbf{A}(\mathbf{r},t)$. It emerges as a non-negligible quantum vacuum correction to the classical (diamagnetic) Einstein-De Haas effect in which an applied external magnetic field - via its action on microscopic magnetism - enforces macroscopic rotation.
description: 10 pages, 1 figure, to appear in Phys. Rev. A
The effects of slashburning on soil mineralizable nitrogen on two sites in the lower Fraser Valley
Creators: name: Douglas, Mary-Jane
Publisher: name: University of British Columbia
Year: 2010

description: The effect of slashburning on soil mineralizable nitrogen, expressed both as a concentration (MN) and on a kg ha⁻¹ basis (MNKG), was determined for a hardwood site and a conifer site in the lower Fraser Valley of British Columbia. Burning appeared to reduce both MN and MNKG in the forest floor of the hardwood site; however, the relative proportion of MN to total nitrogen (TN) lost varied between the two plots on this site. This result was attributed to a difference in burning intensity at the two locations. Results were also similar for the mineral soil, but differences were not as distinct. The site was resampled in the second year and differences between treatments were much larger. In the forest floor of the conifer site, the immediate effect of burning was to increase MN but decrease MNKG. MN decreased by the end of the first month after burning, during which a substantial amount of rain fell. In the mineral soil, differences between the two sampling periods were not so distinct. Total nitrogen (TN), organic carbon (OC), and the pH measured in both water (pHH) and in CaCl₂ (pHC) were also measured to determine if any linear relationship existed between these soil variables and mineralizable nitrogen. TN showed a consistent significant linear correlation with MN, while the other soil variables did not. The decrease in MN on these two sites following burning has significant implications for regenerating these sites.
Simple theory of the measured current through quantum dots
Creators: name: Bernad, Jozsef Zsolt
name: Bodor, Andras
name: Diosi, Lajos
name: Geszti, Tamas
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A simple theory of the detected current I(t) flowing through charge qubits -- quantum dots -- is proposed in terms of standard continuous measurement theory. Applied to a double dot, our formalism easily confirms previous results on quantum Zeno effect, driven by growing ammeter performance gamma. Due to the transparent formalism, we can calculate the exact fluctuation spectrum S(omega) of the detected current, containing a significant Lorentzian peak near the Rabi frequency of the double dot.
description: 4 pages, 2 figures
Contextual Permission Models for Better Privacy Protection
Creators: name: Wijesekera, Primal
Publisher: name: Zenodo
Year: 2018
Subjects: Privacy
Mobile Permissions
Access Control
User Study
Permission Models
Usable Security
Machine Learning
Security

description: Despite corporate cyber intrusions attracting all the attention, privacy breaches that we, as ordinary users, should be worried about occur every day without any scrutiny. Smartphones, a household item, have inadvertently become a major enabler of privacy breaches. Smartphone platforms use permission systems to regulate access to sensitive resources. These permission systems, however, lack the ability to understand users' privacy expectations leaving a significant gap between how permission models behave and how users would want the platform to protect their sensitive data. This dissertation provides an in-depth analysis of how users make privacy decisions in the context of Smartphones and how platforms can accommodate user's privacy requirements systematically. We first performed a 36-person field study to quantify how often applications access protected resources when users are not expecting it. We found that when the application requesting the permission is running invisibly to the user, they are more likely to deny applications access to protected resources. At least 80% of our participants would have preferred to prevent at least one permission request. To explore the feasibility of predicting user's privacy decisions based on their past decisions, we performed a longitudinal 131-person field study. Based on the data, we built a classifier to make privacy decisions on the user's behalf by detecting when the context has changed and inferring privacy preferences based on the user's past decisions. We showed that our approach can accurately predict users' privacy decisions 96.8% of the time, which is an 80% reduction in error rate compared to current systems. Based on these findings, we developed a custom Android version with a contextually aware permission model. The new model guards resources based on user's past decisions under similar contextual circumstances. We performed a 38-person field study to measure the efficiency and usability of the new permission model. Based on exit interviews and 5M data points, we found that the new system is effective in reducing the potential violations by 75%. Despite being significantly more restrictive over the default permission systems, participants did not find the new model to cause any usability issues in terms of application functionality.
Adding Environmental Gas Physics to the Semi-Analytic Method for Galaxy Formation: Gravitational Heating
Creators: name: Khochfar, S.
name: Ostriker, J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results of an attempt to include more detailed gas physics motivated from hydrodynamical simulations within semi-analytic models (SAM) of galaxy formation, focusing on the role that environmental effects play. The main difference to previous SAMs is that we include 'gravitational' heating of the intra-cluster medium (ICM) by the net surplus of gravitational potential energy released from gas that has been stripped from infalling satellites. Gravitational heating appears to be an efficient heating source able to prevent cooling in environments corresponding to dark matter halos more massive than $\sim 10^{13} $M$_{\odot}$. The energy release by gravitational heating can match that by AGN-feedback in massive galaxies and can exceed it in the most massive ones. However, there is a fundamental difference in the way the two processes operate. Gravitational heating becomes important at late times, when the peak activity of AGNs is already over, and it is very mass dependent. This mass dependency and time behaviour gives the right trend to recover down-sizing in the star-formation rate of massive galaxies. Abridged...
description: replaced by accepted version to ApJ, some sections have been dropped and text has been added to others to include the referee's comments, several typos have been corrected
Spatial distribution of local currents of massless Dirac fermions in quantum transport through graphene nanoribbons
Creators: name: Zarbo, Liviu P.
name: Nikolic, Branislav K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We employ the formalism of bond currents, expressed in terms of the nonequilibrium Green functions, to image the charge flow between two sites of the honeycomb lattice of graphene ribbons of few nanometers width. In sharp contrast to nonrelativistic electrons, current density profiles of quantum transport at energies close to the Dirac point in clean zigzag graphene nanoribbons (ZGNR) differs markedly from the profiles of charge density peaked at the edges due to zero-energy localized edge states. For transport through the lowest propagating mode induced by these edge states, edge vacancies do not affect current density peaked in the center of ZGNR. The long-range potential of a single impurity acts to reduce local current around it while concurrently increasing the current density along the zigzag edge, so that ZGNR conductance remains perfect $G=2e^2/h$.
description: 5 pages, 5 figures
WKB Propagation of Gaussian Wavepackets
Creators: name: Maia, Raphael N. P.
name: Nicacio, Fernando
name: Vallejos, Raul O.
name: Toscano, Fabricio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We analyze the semiclassical evolution of Gaussian wavepackets in chaotic systems. We prove that after some short time a Gaussian wavepacket becomes a primitive WKB state. From then on, the state can be propagated using the standard TDWKB scheme. Complex trajectories are not necessary to account for the long-time propagation. The Wigner function of the evolving state develops the structure of a classical filament plus quantum oscillations, with phase and amplitude being determined by geometric properties of a classical manifold.
description: 4 pages, 4 figures; significant improvements
Surfactant spreading in a two-dimensional cavity and emergent contact-line singularities
Creators: name: Mcnair, Richard
name: Jensen, Oliver E.
name: Landel, Julien R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: 76D99

description: We model the advective Marangoni spreading of insoluble surfactant at the free surface of a viscous fluid that is confined within a two-dimensional rectangular cavity. Interfacial deflections are assumed small, with contact lines pinned to the walls of the cavity, and inertia is neglected. Linearizing the surfactant transport equation about the equilibrium state allows a modal decomposition of the dynamics, with eigenvalues corresponding to decay rates of perturbations. Computation of the family of mutually orthogonal two-dimensional eigenfunctions reveals singular flow structures near each contact line, resulting in spatially oscillatory patterns of wall shear stress and a pressure field that diverges logarithmically. These singularities at a stationary contact line are associated with dynamic compression of the surfactant monolayer; we show how they can be regularized by weak surface diffusion. Their existence highlights the need for careful treatment in computations of unsteady advection-dominated surfactant transport in confined domains.
description: 23 pages, 6 figures
Lucas-Kanade Reloaded: End-to-End Super-Resolution from Raw Image Bursts
Creators: name: Lecouat, Bruno
name: Ponce, Jean
name: Mairal, Julien
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This presentation addresses the problem of reconstructing a high-resolution image from multiple lower-resolution snapshots captured from slightly different viewpoints in space and time. Key challenges for solving this problem include (i) aligning the input pictures with sub-pixel accuracy, (ii) handling raw (noisy) images for maximal faithfulness to native camera data, and (iii) designing/learning an image prior (regularizer) well suited to the task. We address these three challenges with a hybrid algorithm building on the insight from Wronski et al. that aliasing is an ally in this setting, with parameters that can be learned end to end, while retaining the interpretability of classical approaches to inverse problems. The effectiveness of our approach is demonstrated on synthetic and real image bursts, setting a new state of the art on several benchmarks and delivering excellent qualitative results on real raw bursts captured by smartphones and prosumer cameras.
Searching for Earth analogues around the nearest stars: the disk age-metallicity relation and the age distribution in the Solar Neighbourhood
Creators: name: Reid, I. Neill
name: Turner, Edwin L.
name: Turnbull, Margaret C.
name: Mountain, M.
name: Valenti, Jeff A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The chemical composition of Earth's atmosphere has undergone substantial evolution over the course of its history. It is possible, even likely, that terrestrial planets in other planetary systems have undergone similar changes; consequently, the age distribution of nearby stars is an important consideration in designing surveys for Earth-analogues. Valenti & Fischer (2005) provide age and metallicity estimates for 1039 FGK dwarfs in the Solar Neighbourhood. Using the Hipparcos catalogue as a reference to calibrate potential biases, we have extracted volume-limited samples of nearby stars from the Valenti-Fischer dataset. Unlike other recent investigations, our analysis shows clear evidence for an age-metallicity relation in the local disk, albeit with substantial dispersion at any epoch. The mean metallicity increases from -0.3 dex at a lookback time of ~10 Gyrs to +0.15 dex at the present day. Supplementing the Valenti-Fischer measurements with literature data to give a complete volume-limited sample, the age distribution of nearby FGK dwarfs is broadly consistent with a uniform star-formation rate over the history of the Galactic disk. In striking contrast, most stars known to have planetary companions are younger than 5 Gyrs; however, stars with planetary companions within 0.4 AU have a significantly flatter age distribution, indicating that those systems are stable on timescales of many Gyrs. Several of the older, lower metallicity host stars have enhanced [alpha/Fe] ratios, implying membership of the thick disk. If the frequency of terrestrial planets is also correlated with stellar metallicity, then the median age of such planetary system is likely to be ~3 Gyrs. We discuss the implications of this hypothesis in designing searches for Earth analogues among the nearby stars.
description: Accepted for publication in ApJ
A Framework for Implementing Role-based Access Control Using CORBA Security Service
Creators: name: Beznosov, Konstantin
Publisher: name: Zenodo
Year: 2005
Subjects: RBAC
CORBA Security
CORBA
Access Control Models and Languages

description: The presentation shows how role-based access control (RBAC) models could be implemented using CORBA Security service. A configuration of CORBA protection system is defined. We provide definitions of RBAC0 and RBAC1 implementations in the framework of CORBA Security and describe what is required from an implementation of CORBA Security service in order to support RBAC0-RBAC3 models.  Outline:  - CORBA access control model  - De nition of CORBA protection state con guration  - Framework for implementing RBAC models using CORBA Security Service  - Example con gurations of CORBA protection state that support RBAC models
A Framework for Implementing Role-based Access Control Using CORBA Security Service
Creators: name: Beznosov, Konstantin
Publisher: name: Zenodo
Year: 2005
Subjects: RBAC
CORBA Security
CORBA
access control

description: The presentation shows how role-based access control (RBAC) models could be implemented using CORBA Security service. A configuration of CORBA protection system is defined. We provide definitions of RBAC0 and RBAC1 implementations in the framework of CORBA Security and describe what is required from an implementation of CORBA Security service in order to support RBAC0-RBAC3 models.  Outline:  - CORBA access control model  - Definition of CORBA protection state con guration  - Framework for implementing RBAC models using CORBA Security Service  - Example con gurations of CORBA protection state that support RBAC models
Colourful Poincaré symmetry, gravity and particle actions
Creators: name: Gomis, Joaquim
name: Joung, Euihun
name: Kleinschmidt, Axel
name: Mkrtchyan, Karapet
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a generalisation of the three-dimensional Poincaré algebra that also includes a colour symmetry factor. This algebra can be used to define coloured Poincaré gravity in three space-time dimensions as well as to study generalisations of massive and massless free particle models. We present various such generalised particle models that differ in which orbits of the coloured Poincaré symmetry are described. Our approach can be seen as a stepping stone towards the description of particles interacting with a non-abelian background field or as a starting point for a worldline formulation of an associated quantum field theory.
description: 54 pages
Magnetization Transfer-Mediated MR Fingerprinting
Creators: name: West, Daniel J.
name: Cruz, Gastao
name: Teixeira, Rui P. A. G.
name: Schneider, Torben
name: Tournier, Jacques-Donald
name: Hajnal, Joseph V.
name: Prieto, Claudia
name: Malik, Shaihan J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Purpose: Magnetization transfer (MT) and inhomogeneous MT (ihMT) contrasts are used in MRI to provide information about macromolecular tissue content. In particular, MT is sensitive to macromolecules and ihMT appears to be specific to myelinated tissue. This study proposes a technique to characterize MT and ihMT properties from a single acquisition, producing both semiquantitative contrast ratios, and quantitative parameter maps. Theory and Methods: Building upon previous work that uses multiband radiofrequency (RF) pulses to efficiently generate ihMT contrast, we propose a cyclic-steady-state approach that cycles between multiband and single-band pulses to boost the achieved contrast. Resultant time-variable signals are reminiscent of a magnetic resonance fingerprinting (MRF) acquisition, except that the signal fluctuations are entirely mediated by magnetization transfer effects. A dictionary-based low-rank inversion method is used to reconstruct the resulting images and to produce both semiquantitative MT ratio (MTR) and ihMT ratio (ihMTR) maps, as well as quantitative parameter estimates corresponding to an ihMT tissue model. Results: Phantom and in vivo brain data acquired at 1.5T demonstrate the expected contrast trends, with ihMTR maps showing contrast more specific to white matter (WM), as has been reported by others. Quantitative estimation of semisolid fraction and dipolar T1 was also possible and yielded measurements consistent with literature values in the brain. Conclusions: By cycling between multiband and single-band pulses, an entirely magnetization transfer mediated 'fingerprinting' method was demonstrated. This proof-of-concept approach can be used to generate semiquantitative maps and quantitatively estimate some macromolecular specific tissue parameters.
description: 34 Pages and 15 Figures (Including Supporting Information), Submitted to Magnetic Resonance in Medicine (MRM). Updated to include link to final published article
Οι καινοτομίες στο μείγμα μάρκετινγκ (marketing mix) και η σημασία τους για τους μη κερδοσκοπικούς πολιτιστικούς οργανισμούς:
Creators: name: Μοναστηρίδης, Πρόδρομος Θ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: subject: Καινοτομία
subject: Μάρκετινγκ
subject: Μη κερδοσκοπικοί πολιτιστικοί οργανισμοί
subject: Innovation
subject: Marketing
subject: FOS: Economics and business
subject: Non profit cultural organizations

description: Η διατριβή είχε σαν στόχο να ερευνήσει πως οι καινοτομίες στο μείγμα μάρκετινγκ (με τα 7P) μπορούν να επιδράσουν και με ποίο τρόπο στη λειτουργία και την δραστηριότητα των μη κερδοσκοπικών πολιτιστικών οργανισμών. Η έρευνα ασχολήθηκε με την καινοτομία και τους πολιτιστικούς οργανισμούς, στην Ελλάδα. Συγκεκριμένα με βάση τους μεγαλύτερους (ιδιωτικού και δημόσιου χαρακτήρα) πολιτιστικούς οργανισμούς, διαμορφώθηκε ένα δείγμα 11 φορέων και εξετάστηκε πως αντιλαμβάνονται και εφαρμόζουν την καινοτομία σε σχέση με το marketing mix και πως επηρεάζεται η απόδοση τους. Τέλος έκανε προτάσεις για την αποτελεσματικότερη εφαρμογή καινοτομικών στρατηγικών. Η μεθοδολογία που ακολουθήθηκε είναι αυτή της μελέτης περιπτώσεων (case studies). Με την βοήθεια ενός ημιδομημένου ερωτηματολογίου έγιναν συνεντεύξεις με τους επικεφαλής των οργανισμών ενώ η έρευνα περιελάμβανε ανάλυση δευτερογενών στοιχείων και προσωπική παρατήρηση. Τα αποτελέσματα έδειξαν ότι από τις μεταβλητές του μείγματος μάρκετινγκ, αυτή που έχει τη μεγαλύτερη καινοτομική σημασία για τους μη κερδοσκοπικούς πολιτιστικούς οργανισμούς είναι το προϊόν, ενώ ακολουθεί η προώθηση και οι διαδικασίες, Στον αντίποδα την μικρότερη σημασία έχουν οι άνθρωποι, μεταβλητή που η έρευνα επισήμανε ότι θα έπρεπε να έχει μεγαλύτερη προσοχή. Η έρευνα επίσης σημείωσε την απουσία στρατηγικής, την ελλιπή κατανόηση και χρήση στρατηγικών μάρκετινγκ καθώς και την έλλειψη εξειδικευμένου προσωπικού.
description: The thesis had as a target to research how innovations in the marketing mix (the one with the 7Ps) can affect and in what way the operations and the activities of non profit cultural organizations. The research had as a focus innovation and Greek cultural non profit organizations. Having as a starting point the biggest (both public and private) cultural organizations a sample of 11 organizations was gathered and it was explored how they conceptualize and implement innovation in relation with the marketing mix and how this relation influences their performance. Finally the research proposed effective innovation strategies. Methodology used the case study approach. A semi-structured questionnaire was used to all cultural organizations top management (either artistic or administrative) combined with secondary sources and personal observation. Results showed that the marketing mix variable with the heavier innovation importance is product, followed by promotion and processes. On the other end the less important variable is people in spite of the fact that the research showed it needs more attention. In addition the results pointed out the luck of strategies, the misunderstanding of marketing importance and the luck of qualified staff.
Ο Θεός του Ισραήλ και οι νεκροί στους Ψαλμούς:
Creators: name: Κράλλη-Eckholdt, Ευαγγελία Χ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ψαλμοί
Γιαχβέ
Σεόλ
Θάνατος
Psalms
Yahweh
Sheol
Death

description: Κοινό χαρακτηριστικό όλων σχεδόν των αρχαίων πολιτισμών είναι η πίστη στη μετα-θανάτια ύπαρξη του ανθρώπου. Ο θάνατος δεν ισοδυναμεί με τον τέλειο και ολοκλη-ρωτικό αφανισμό της ανθρώπινης ζωής. Αυτή συνεχίζεται και μετά τον βιολογικό θάνατο, οπότε και οι νεκροί ‛ζουν’ σε ένα άλλο, διαφορετικό επίπεδο. Ενώ τα μυθο-λογικά κείμενα των λαών της αρχαίας Εγγύς Ανατολής αναφέρονται στην ύπαρξη μιας χθόνιας θεότητας, η οποία βασιλεύει στον κόσμο των νεκρών και διαδραματίζει πρωταγωνιστικό ρόλο στις εκάστοτε διηγήσεις και παραδόσεις, στον Ισραήλ φαίνεται καταρχήν πως ο Γιαχβέ δεν ασχολείται καθόλου με ό,τι σχετίζεται με τη σφαίρα του θανάτου. Η παρούσα διδακτορική διατριβή έχει ως θέμα της τις ψαλμικές παραστάσεις περί Θεού και νεκρών. Μέσα από την ανάλυση 10 ψαλμών, οι οποίοι, εξαιτίας των θεματικών και γλωσσικών μοτίβων που περιέχουν, παρουσιάζουν ιδιαίτερο ενδιαφέ-ρον, επιχειρείται η περιγραφή και η ερμηνεία της όποιας σχέσης μεταξύ του Γιαχβέ και των νεκρών. Εικόνες με έντονα ποιητική διάθεση που εμφανίζουν τους νεκρούς από τη μια σε κατάσταση αποκλεισμού και πλήρους εγκατάλειψης και από την άλλη σε κοινωνία με τον Θεό συνυπάρχουν μεταξύ τους και συνθέτουν το μωσαϊκό των ρευμάτων και των τάσεων που επικρατούσαν στους κόλπους του Ισραήλ.
description: A common feature of almost all ancient cultures is the belief of a postmortem existence of human being. Death is not equivalent to the perfect and absolute extinguishment of human life. This continues after the biological death, when the dead ‛live’ in another, different level. While the mythological texts of the peoples of the ancient Near East mention the existence of a chthonic deity, who reigns over the world of the dead and plays a key role in the prevailing narratives and traditions, it seems in principle that in Israel Yahweh does not deal at all with anything that relates to the sphere of death. The theme of this thesis is the psalmic presentations of God and the dead. On the basis of an analysis of 10 psalms, who are of special interest because of their thematic and linguistic patterns, it is attempted to describe and inter-pret any relationship between Yahweh and the dead. Images with a strong poetic mood, showing that, on the one hand, the dead suffer exclusion and full abandonment, and, on the other, they are in fellowship with God, coexist with each other and make up the mosaic of trends and tendencies prevailing in Israel.
Additional file 2 of Performance of whole-genome promoter nucleosome profiling of maternal plasma cell-free DNA for prenatal noninvasive prediction of fetal macrosomia: a retrospective nested case-control study in mainland China
Creators: name: Lu, Qianwen
name: Guo, Zhiwei
name: Zhang, Jun
name: Wang, Ke
name: Tian, Qi
name: Liu, Siping
name: Li, Kun
name: Xu, Cailing
name: Li, Caimin
name: Lv, Zenglu
name: Zhang, Zhigang
name: Yang, Xuexi
name: Yang, Fang
Publisher: name: figshare
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2.
LSPnet: A 2D Localization-oriented Spacecraft Pose Estimation Neural Network
Creators: name: Garcia, Albert
name: Musallam, Mohamed Adel
name: Gaudilliere, Vincent
name: Ghorbel, Enjie
name: Ismaeil, Kassem Al
name: Perez, Marcos
name: Aouada, Djamila
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Being capable of estimating the pose of uncooperative objects in space has been proposed as a key asset for enabling safe close-proximity operations such as space rendezvous, in-orbit servicing and active debris removal. Usual approaches for pose estimation involve classical computer vision-based solutions or the application of Deep Learning (DL) techniques. This work explores a novel DL-based methodology, using Convolutional Neural Networks (CNNs), for estimating the pose of uncooperative spacecrafts. Contrary to other approaches, the proposed CNN directly regresses poses without needing any prior 3D information. Moreover, bounding boxes of the spacecraft in the image are predicted in a simple, yet efficient manner. The performed experiments show how this work competes with the state-of-the-art in uncooperative spacecraft pose estimation, including works which require 3D information as well as works which predict bounding boxes through sophisticated CNNs.
description: 9 pages, 5 figures, published at AI4Space 2021 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)
A Combined Spitzer and Chandra Survey of Young Stellar Objects in the Serpens Cloud Core
Creators: name: Winston, E.
name: Megeath, S. T.
name: Wolk, S. J.
name: Muzerolle, J.
name: Gutermuth, R.
name: Hora, J. L.
name: Allen, L. E.
name: Spitzbart, B.
name: Myers, P.
name: Fazio, G. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Spitzer and Chandra observations of the nearby (~260 pc) embedded stellar cluster in the Serpens Cloud Core. We observed, using Spitzer's IRAC and MIPS instruments, in six wavelength bands from 3 to 70 $μm$, to detect thermal emission from circumstellar disks and protostellar envelopes, and to classify stars using color-color diagrams and spectral energy distributions (SEDs). These data are combined with Chandra observations to examine the effects of circumstellar disks on stellar X-ray properties. Young diskless stars were also identified from their increased X-ray emission. We have identified 138 YSOs in Serpens: 22 class 0/I, 16 flat spectrum, 62 class II, 17 transition disk, and 21 class III stars; 60 of which exhibit X-ray emission. Our primary results are the following: 1.) ten protostars detected previously in the sub-millimeter are detected at lambda < 24 microns, seven at lambda < 8 microns, 2.) the protostars are more closely grouped than more evolved YSOs (median separation : ~0.024 pc, and 3.) the luminosity and temperature of the X-ray emitting plasma around these YSOs does not show any significant dependence on evolutionary class. We combine the infrared derived values of AK and X-ray values of NH for 8 class III objects and find that the column density of hydrogen gas per mag of extinctions is less than half the standard interstellar value, for AK > 1. This may be the result of grain growth through coagulation and/or the accretion of volatiles in the Serpens cloud core.
description: 69 pages, 16 figures, accepted to ApJ. Higher Resolution Figures at: http://www.cfa.harvard.edu/~ewinston/
Antiferromagnetic magnons and local anisotropy: dynamical mean-field study
Creators: name: Niyazi, A.
name: Geffroy, D.
name: Kunes, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a dynamical mean-field study of antiferromagnetic magnons in one-, two- and three-orbital Hubbard model of square and bcc cubic lattice at intermediate coupling strength. Weinvestigate the effect of anisotropy introduced by an external magnetic field or single-ion anisotropy.For the latter we tune continuously between the easy-axis and easy-plane models. We also analyzea model with spin-orbit coupling in cubic site-symmetry setting. The ordered states as well as themagnetic excitations are sensitive to even a small breaking ofSU(2)symmetry of the model andfollow the expectations of spin-wave theory as well as general symmetry considerations.
description: 8 pages, 6 figures
Analysis of Data-At-Rest Security In Smartphones
Creators: name: Muslukhov, Ildar
Publisher: name: Zenodo
Year: 2018
Subjects: Static Analysis
Source Attribution
Android
Cryptography APIs
Applied Cryptography
Smartphone
Privacy
Security

description: With almost two billion users worldwide, smartphones are used for almost everything – booking a hotel, ordering a cup of coffee, or paying in a shop. However, small size and high mobility makes these devices prone to theft and loss. In this work we aim to broaden our understanding of how smartphone users and application developers protect sensitive data on smartphones. To understand how well users are protecting their data in smartphones, we conducted several studies. The results revealed that 50% of the subjects locked their smartphone with an unlocking secret and 95% of them chose unlocking secrets that could be guessed within minutes. To understand how well application developers protect sensitive data in smartphones, we analyzed 132K Android applications. We focused on identifying misuse of cryptography in applications and libraries. The study results revealed that developers often misuse cryptographic API. In fact, 9 out of 10 Android applications contained code that used a symmetric cipher with a static encryption key. Further, source attribution revealed that libraries are the main consumer of cryptography and the major contributor of misuse cases. Finally, an in-depth analysis of the top libraries highlighted the need for improvement in the way we define and detect misuse of cryptography. Based on these results we designed and evaluated a system for encryption keys management that uses wearable devices as an additional source of entropy. Evaluation results showed that the proposal introduces insignificant overhead in power consumption and latency.
Geometric Brownian Motion under Stochastic Resetting: A Stationary yet Non-ergodic Process
Creators: name: Stojkoski, Viktor
name: Sandev, Trifce
name: Kocarev, Ljupco
name: Pal, Arnab
Publisher: name: arXiv
Year: 2021
Subjects: subject: Risk Management (q-fin.RM)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We study the effects of stochastic resetting on geometric Brownian motion (GBM), a canonical stochastic multiplicative process for non-stationary and non-ergodic dynamics. Resetting is a sudden interruption of a process, which consecutively renews its dynamics. We show that, although resetting renders GBM stationary, the resulting process remains non-ergodic. Quite surprisingly, the effect of resetting is pivotal in manifesting the non-ergodic behavior. In particular, we observe three different long-time regimes: a quenched state, an unstable and a stable annealed state depending on the resetting strength. Notably, in the last regime, the system is self-averaging and thus the sample average will always mimic ergodic behavior establishing a stand alone feature for GBM under resetting. Crucially, the above-mentioned regimes are well separated by a self-averaging time period which can be minimized by an optimal resetting rate. Our results can be useful to interpret data emanating from stock market collapse or reconstitution of investment portfolios.
Non-Classical Kernels in Continuous Variable Systems
Creators: name: Ghobadi, Roohollah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Kernel methods are ubiquitous in classical machine learning, and recently their formal similarity with quantum mechanics has been established. To grasp the potential advantage of quantum machine learning, it is necessary to understand the distinction between non-classical kernel functions and classical kernels. This paper builds on a recently proposed phase space nonclassicality witness [Bohmann, Agudelo, Phys. Rev. Lett. 124, 133601 (2020)] to derive a witness for the kernel's quantumness in continuous-variable systems. We discuss the role of kernel's nonclassicality in data distribution in the feature space and the effect of imperfect state preparation. Furthermore, we show that the non-classical kernels lead to the quantum advantage in parameter estimation. Our work highlights the role of the phase space correlation functions in understanding the distinction between classical machine learning from quantum machine learning.
Measuring the dark side (with weak lensing)
Creators: name: Amendola, Luca
name: Kunz, Martin
name: Sapone, Domenico
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We introduce a convenient parametrization of dark energy models that is general enough to include several modified gravity models and generalized forms of dark energy. In particular we take into account the linear perturbation growth factor, the anisotropic stress and the modified Poisson equation. We discuss the sensitivity of large scale weak lensing surveys like the proposed DUNE satellite to these parameters. We find that a large-scale weak-lensing tomographic survey is able to easily distinguish the Dvali-Gabadadze-Porrati model from LCDM and to determine the perturbation growth index to an absolute error of 0.02-0.03.
description: 19 pages, 11 figures
Catálogo: II exposição coletiva da setorial de Artes Visuais, Design e Moda de Blumenau
Creators: name: Melchioretto, Albio Fabian
name: Scoz, Emanuella
Publisher: name: Zenodo
Year: 2024
Subjects: Cultura Local
Artes
Blumenau

description: O catálogo da II Exposição Coletiva de Artes Visuais, Design e Moda de Blumenau, Santa Catarina, celebra a diversidade artística da cidade, conectando múltiplos talentos emergentes e consagrados. Um evento que promoveu a inclusão de diferentes devires, oferecendo um espaço significado para a troca de ideias e a valorização da cultura local. A exposição ajudou a incluir artistas e a criar um acervo acessível para todos, tanto fisicamente quanto virtualmente.
Ξένη προπαγάνδα, κουλτούρα πολιτική στο καθεστώς της 4ης Αυγούστου: το περιοδικό “Olimpo”
Creators: name: Καγιόγλου, Φωτεινή Ανθ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Προπαγάνδα
Πολιτική
Φασισμός
Λογοτεχνία
Propaganda
Politics
Fascism
Literature

description: Εδώ και πολλά χρόνια ένα ερώτημα που με ταλανίζει είναι πώς άνθρωποι που γνώρισαν τη δημοκρατία την εγκαταλείπουν για καθεστώτα ολιγαρχικά, αυταρχικά, ολοκληρωτικά. Για να απαντήσω στο ερώτημα αυτό έπρεπε να γνωρίσω καλά το ένα από τα δύο ολοκληρωτικά καθεστώτα που καθόρισαν την ιστορία του 20ού αιώνα, τον φασισμό. Πάντα αναρωτιόμουν πώς έπειθαν οι φασίστες τους μετέπειτα οπαδούς τους• αυτό με οδήγησε στο να ψάξω πώς γινόταν η προπαγάνδα, ποια μέσα χρησιμοποιούσε και αν τελικά ήταν πετυχημένη. Ήταν σχεδόν έκπληξη να διαπιστώνω στην πορεία της διατριβής αυτής ότι οι φασίστες έκαναν προπαγάνδα ακόμη και σε ξένα κράτη, όπως ήταν το δικό μας, μέσω περιοδικών λογοτεχνικών• εξέτασα λοιπόν και άλλα ανάλογα περιοδικά της εποχής. Με αυτό το σκοπό παρουσιάζω το περιεχόμενο του περιοδικού Olimpo.
description: For many years, there is a question that has been causing me a great concern; how can people who have already experienced democracy abandon it for oligarchic, authoritarian or totalitarian regimes. In order to answer this question, I had to familiarize myself with one of the two totalitarian regimes which defined the history of the 20th century, meaning fascism. I have always been wondering how fascists could persuade their subsequent fans. This led me first to seek the way propaganda was spread, the means used as well as to find out whether it was successful. It was almost a surprise to realize throughout this thesis that fascists mounted propaganda even in foreign nations, such as ours, through literary journals. For this reason, I also examined other relevant journals of the period. For this purpose, I present the content of Olimpo journal.
Η κατασκευή της κοριτσίστικης ταυτότητας στην προεφηβική ηλικία: ζητήματα εθνοπολιτισμικής προέλευσης και κοινωνικοοικονομικής κατάστασης
Creators: name: Θεοδοσίου-Τρυφωνίδου, Αριστονίκη Χρ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Προεφηβεία
Κοριτσίστικη ταυτότητα
Κορίτσια
Λαική κουλτούρα
Tweens, prepuberty
Girls identity
Girls
Pop culture

description: Με πλαίσιο τη μεταμοντέρνα θεώρηση του φύλου η μελέτη αυτή διερεύνησε το πώς κατασκευάζεται η έμφυλη ταυτότητα στα προέφηβα κορίτσια μέσα από τις συνιστώσες της εθνοπολιτισμικής προέλευσης και της κοινωνικοοικονομικής κατάστασης αναφορικά με τις εμπειρίες των 15 προεφήβων κοριτσιών και των μητέρων τους. Η έρευνα ήταν ποιοτική. Για τη συλλογή των δεδομένων χρησιμοποιήθηκαν οι ομάδες εστίασης, η φαινομενολογική μέθοδος της Betensky και οι ημι-δομημένες συνεντεύξεις, ενώ η ανάλυση έγινε με τη θεματική μέθοδο. Τα αποτελέσματα δείχνουν ότι μέσα από την εμπειρία των προεφήβων κοριτσιών και των μητέρων τους διαφαίνεται ότι η έμφυλη ταυτότητα στην προεφηβεία δέχεται επιρροές από τη λαϊκή κουλτούρα και τη σχέση μητέρας με κόρη, καθώς και ότι η εθνοπολιτισμική προέλευση και η κοινωνικοοικονομική κατάσταση αποτελούν συνιστώσες της δόμησης της κοριτσίστικης ταυτότητας.
description: This particular research, within the framework of the post-modern perspective on gender, attempted to investigate on how the gender identity is constructed on girls during their pre-puberty stage of life, through components of their ethno-cultural origin and their socio-economic status with reference to the experience of 15 girls in their pre-puberty stage and their mothers. The research was qualitative. Focus-groups, drawing sessions based on the Betensky’s phenomenology method and semi-structures interviews, were used in order to collect the necessary data, while everything was analyzed by the thematic method. The results makes quite clear, within the experience of the particular girls and their mothers, that the pre-puberty gender identity is structured by two parallel influences. The first one consists of the popular culture and the mother-daughter relationship, while the ethno-cultural origin and the socio-economic status are very important factors in composing the identity of each girl.
Non-parametric inversion of gravitational lensing systems with few images using a multi-objective genetic algorithm
Creators: name: Liesenborgs, J.
name: De Rijcke, S.
name: Dejonghe, H.
name: Bekaert, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Galaxies acting as gravitational lenses are surrounded by, at most, a handful of images. This apparent paucity of information forces one to make the best possible use of what information is available to invert the lens system. In this paper, we explore the use of a genetic algorithm to invert in a non-parametric way strong lensing systems containing only a small number of images. Perhaps the most important conclusion of this paper is that it is possible to infer the mass distribution of such gravitational lens systems using a non-parametric technique. We show that including information about the null space (i.e. the region where no images are found) is prerequisite to avoid the prediction of a large number of spurious images, and to reliably reconstruct the lens mass density. While the total mass of the lens is usually constrained within a few percent, the fidelity of the reconstruction of the lens mass distribution depends on the number and position of the images. The technique employed to include null space information can be extended in a straightforward way to add additional constraints, such as weak lensing data or time delay information.
description: 9 pages, accepted for publication by MNRAS
An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission
Creators: name: Hughes, A. M.
name: Wilner, D. J.
name: Calvet, N.
name: D'Alessio, P.
name: Claussen, M. J.
name: Hogerheijde, M. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Very Large Array observations at 7 millimeters wavelength that resolve the dust emission structure in the disk around the young star TW Hydrae at the scale of the ~4 AU (~0.16") radius inner hole inferred from spectral energy distribution modeling. These high resolution data confirm directly the presence of an inner hole in the dust disk and reveal a high brightness ring that we associate with the directly illuminated inner edge of the disk. The clearing of the inner disk plausibly results from the dynamical effects of a giant planet in formation. In an appendix, we develop an analytical framework for the interpretation of visibility curves from power-law disk models with inner holes.
description: 8 pages, 4 figures, accepted by ApJ
CNNs for enhanced background discrimination in DSNB searches in large-scale water-Gd detectors
Creators: name: Maksimović, David
name: Nieslony, Michael
name: Wurm, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Gadolinium-loading of large water Cherenkov detectors is a prime method for the detection of the Diffuse Supernova Neutrino Background (DSNB). While the enhanced neutron tagging capability greatly reduces single-event backgrounds, correlated events mimicking the IBD coincidence signature remain a potentially harmful background. Neutral-Current (NC) interactions of atmospheric neutrinos potentially dominate the DSNB signal especially in the low-energy range of the observation window that reaches from about 12 to 30 MeV. The present paper investigates a novel method for the discrimination of this background. Convolutional Neural Networks (CNNs) offer the possibility for a direct analysis and classification of the PMT hit patterns of the prompt events. Based on the events generated in a simplified SuperKamiokande-like detector setup, we find that a trained CNN can maintain a signal efficiency of 96 % while reducing the residual NC background to 2 % of the original rate. Comparing to recent predictions of the DSNB signal and measurements of the NC background levels in Super-Kamiokande, the corresponding signal-to-background ratio is about 4:1, providing excellent conditions for a DSNB discovery.
description: 16 pages, 9 figures
Πολιορκίες και αλώσεις στα βυζαντινά ρητορικά και αγιολογικά κείμενα:
Creators: name: Τσιαπλές, Γεώργιος Β.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Πολιορκίες
Αλώσεις
Πόλεις
Βυζαντινή γραμματεία
Sieges
Falls
Cities
Byzantine Literature

description: Η παρούσα διατριβή ασχολέιται με τις περιγραφές πολιορκιών και αλώσεων πόλεων στα βυζαντινά ρητορικά και αγιολογικά κείμενα. Από την πρώιμη βυζαντινή περίοδο μέχρι την τελική κατάρρευση της Κωνσταντινούπολης ρήτορες και συγγραφείς αγιολογικών κειμένων συνέταξαν μια σειρά από έργα με αφορμή την πολιορκία ή την άλωση κάποιας βυζαντινής πόλης. Σκοπός της διατριβής δεν είναι μόνο η καταγραφή των συγκεκριμένων κειμένων, αλλά να εξετάσει τις εικόνες, τα μοτίβα και τους σκοπούς συγγραφής αυτών των κειμένων.
description: This thesis deals with the descriptions of Cities' sieges and falls in byzantine rhetoric and hagiographical texts. From the early Byzantine period until the final collapse of Constantinople, orators and writers of hagiographical texts produced a series of works on the occasion of the siege or the fall of a Byzantine city. The aim of the thesis is not only to record these texts, but, also, to examine the images, the motifs and the authoring purposes of these texts.
Θηβαϊκές επιρροές στην Ιλιάδα και την Οδύσσεια:
Creators: name: Αλεξανδράκη, Ειρήνη Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Θήβα
Οιδίποδας
Πρωταρχικά / δευτερογενή μοτίβα
Thebes
Oedipus
Primary / secondary motives

description: Σκοπός της διατριβής ήταν οι επιδράσεις της θηβαϊκής παράδοσης στα ομηρικά έπη από τη νεοαναλυτική σκοπιά. Συγκεκριμένα, επιδιώχτηκε να αποδειχτεί ότι κάποια μοτίβα που αξιοποιούνται από την Ιλιάδα και την Οδύσσεια επιχωριάζουν στη θηβαϊκή παράδοση, καθώς εκεί αποτελούν αναπόσπαστα στοιχεία της πλοκής και της προώθησης του μύθου, έχουν λειτουργική αξία και ολοκληρώνονται ως προς τις πτυχές τους, έτσι ώστε να προκαλείται τραγικότητα ή αποτροπιασμός στα επεισόδια όπου ενυπάρχουν. Διερευνήθηκε λοιπόν ο τρόπος με τον οποίο αξιοποιούνται τα εν λόγω μοτίβα στην Ιλιάδα και την Οδύσσεια, τα οποία –εντασσόμενα στα διαφορετικά ομηρικά συμφραζόμενα- μεταλλάσσονται, ώστε να αποδώσουν ένα διαφορετικό ή καινούργιο νόημα. Με τη διαδικασία αυτή αναβαπτίζονται ενταγμένα σε νέα συμφραζόμενα.
description: The aim of the present thesis was the study of the influence of the theban tradition on the homeric epics from a neoanalytical scope. Specifically, I tried to demonstrate that some motives that were used in the Iliad and the Odyssey belong primarily to the theban tradition, where they are completely compatible with their contexts and they lead to tragic consequences. Consequently, I have examined the way these motives work as a narratological tool in the Iliad and the Odyssey and specifically the way these motives are transformed when they are embedded in the Iliad and the Odyssey, so as to unfold a new or a different meaning in the homeric epics.