cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A comparative analysis of multi-dimensional indexing structures for "eigenimages"
Creators: name: Sedighian, Andishe Samandari
Publisher: name: University of British Columbia
Year: 2009

description: Content-based retrieval in image management systems requires indexing of image feature vectors. Most feature vectors have a high number of dimensions (>20). This makes indexing difficult since most existing multi-dimensional , indexing structures grow exponentially in size as dimensions increase. We approach this problem in three stages: i) reduce the dimensionality of the feature space, ii) evaluate existing multi-dimensional indexing structures to determine which can best organize the new feature space, and iii) customize one of the selected structures to improve search performance. To reduce the dimensionality of the feature space without losing much information we apply a statistical technique called Principal Component Analysis (PCA), using Turk and Pentland's eigenfaces approach. We then conduct a comparative analysis of a wide range of existing multi-dimensional indexing structures (quad trees, KD-trees, R-trees, gridfile, and multipaging), selecting three of them (bucket adaptive KD-tree, gridfile, R-tree) for further empirical comparisons. Tests show that the bucket adaptive KD-tree uses the least storage and peforms the best during search. Finally, we customize the bucket adaptive KD-tree by implementing techniques that take advantage of the characteristics of the transformed space — namely ranked dimensions by decreasing variance and known dynamic ranges. This prunes the search space and results in very efficient searches. The number of page accesses are reduced significantly, some times leading to savings as high as 70%.
Deep Semi-Supervised Learning for Time Series Classification
Creators: name: Goschenhofer, Jann
name: Hvingelby, Rasmus
name: Rügamer, David
name: Thomas, Janek
name: Wagner, Moritz
name: Bischl, Bernd
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: While Semi-supervised learning has gained much attention in computer vision on image data, yet limited research exists on its applicability in the time series domain. In this work, we investigate the transferability of state-of-the-art deep semi-supervised models from image to time series classification. We discuss the necessary model adaptations, in particular an appropriate model backbone architecture and the use of tailored data augmentation strategies. Based on these adaptations, we explore the potential of deep semi-supervised learning in the context of time series classification by evaluating our methods on large public time series classification problems with varying amounts of labelled samples. We perform extensive comparisons under a decidedly realistic and appropriate evaluation scheme with a unified reimplementation of all algorithms considered, which is yet lacking in the field. We find that these transferred semi-supervised models show significant performance gains over strong supervised, semi-supervised and self-supervised alternatives, especially for scenarios with very few labelled samples.
Cimolopteryx Marsh 1889
Creators: name: Marsh, O. C.
Publisher: name: Zenodo
Year: 1892
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Charadriiformes
Cimolopterygidae
Cimolopteryx

description: Cimolopteryx, Marsh, 1889.
 The only bird hitherto known from the Laramie deposits is Cimolopteryx rarus, the type specimen of which is represented on Plate III, figure 2. Another species, about twice the size of the first, is indicated by various remains, among them the coracoid.^ This bone lacks the strong inner process near the pit for the scapula, which is characteristic' of the smaller form. The present species, which may be called Cimolopteryx retusus, is also from Wyoming.
 The new Laramie fossils here described and figured were collected by Mr. J. B. Hatcher and party, in the Ceratops beds of Montana and Wyoming. They will all be discussed more fully in another communication.
description: Published as part of Marsh, O. C., 1892, Notes on Mesozoic vertebrate fossils, pp. 171-176 in American Journal of Science 260 on page 175, DOI: 10.5281/zenodo.2838842
Kinetic and magnetic alpha effects in nonlinear dynamo theory
Creators: name: Sur, Sharanya
name: Subramanian, Kandaswamy
name: Brandenburg, Axel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The backreaction of the Lorentz force on the alpha-effect is studied in the limit of small magnetic and fluid Reynolds numbers, using the first order smoothing approximation (FOSA) to solve both the induction and momentum equations. Both steady and time dependent forcings are considered. In the low Reynolds number limit, the velocity and magnetic fields can be expressed explicitly in terms of the forcing function. The nonlinear alpha-effect is then shown to be expressible in several equivalent forms in agreement with formalisms that are used in various closure schemes. On the one hand, one can express alpha completely in terms of the helical properties of the velocity field as in traditional FOSA, or, alternatively, as the sum of two terms, a so-called kinetic alpha-effect and an oppositely signed term proportional to the helical part of the small scale magnetic field. These results hold for both steady and time dependent forcing at arbitary strength of the mean field (abridged).
description: Accepted for publication in MNRAS
Revisiting the flux tube spectrum of 3d SU(2) lattice gauge theory
Creators: name: Brandt, Bastian B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We perform a high precision measurement of the spectrum of the QCD flux tube in three-dimensional $\SU(2)$ gauge theory at multiple lattice spacings. We compare the results at large $q\bar{q}$ separations $R$ to the spectrum predicted by the effective string theory, including the leading order boundary term with a non-universal coefficient. We find qualitative agreement with the predictions from the leading order Nambu-Goto string theory down to small values of $R$, while, at the same time, observing the predicted splitting of the second excited state due to the boundary term. On fine lattices and at large $R$ we observe slight deviations from the EST predictions for the first excited state.
description: Contribution to Indian Journal of Physics memorial issue for Pushan Majumdar. 16 pages, 5 figures; v2: enhanced discussion, conclusions unchanged, new version to match published version
Are Domain Walls in Spin Glasses Described by Stochastic Loewner Evolutions?
Creators: name: Bernard, Denis
name: Doussal, Pierre Le
name: Middleton, A. Alan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Domain walls for spin glasses are believed to be scale invariant invariant; a stronger symmetry, conformal invariance, has the potential to hold. The statistics of zero-temperature Ising spin glass domain walls in two dimensions are used to test the hypothesis that these domain walls are described by a Schramm-Loewner evolution SLE$_κ$. Multiple tests are consistent with SLE$_κ$, where $κ=2.30(5)$. Both conformal invariance and the domain Markov property are tested. The latter does not hold in small systems, but detailed numerical evidence suggests that it holds in the continuum limit.
description: 4 pages, 3 figures, see related work by Amoruso, Hartmann, Hastings, Moore at cond-mat/0601711
The Kinematics of Kepler's Supernova Remnant as revealed by Chandra
Creators: name: Vink, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I determine the expansion of the supernova remnant of SN1604 (Kepler's supernova) based on archival Chandra ACIS-S observations made in 2000 and 2006. The measurements were done in several distinct energy bands, and were made for the remnant as a whole, and for six individual sectors. The average expansion parameter indicates that the remnant expands as $r \propto t^{0.5}$, but there are significant differences in different parts of the remnant: the bright northwestern part expands as $r \propto t^{0.35}$, whereas the rest of the remnant's expansion shows an expansion $r \propto t^{0.6}$. The latter is consistent with an explosion in which the outer part of the ejecta has a negative power law slope for density ($ρ\propto v^{-n}$) of $n=7$, or with an exponential density profile($ρ\propto \exp(-v/v_e)$). The expansion parameter in the southern region, in conjunction with the shock radius, indicate a rather low value (<5E50 erg) for the explosion energy of SN1604 for a distance of 4 kpc. An higher explosion energy is consistent with the results, if the distance is larger. The filament in the eastern part of the remnant, which is dominated by X-ray synchrotron radiation seems to mark a region with a fast shock speed $r \propto t^{0.7}$, corresponding to a shock velocity of v= 4200 km/s, for a distance to SN1604 of 4 kpc. This is consistent with the idea that X-ray synchrotron emission requires shock velocities in excess of ~2000 km/s. The X-ray based expansion measurements reported are consistent with results based on optical and radio measurements, but disagree with previous X-ray measurements based on ROSAT and Einstein observations.
description: Accepted for publication in ApJ. This new version is the accepted version, which differs mainly in the discussion section
Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
Creators: name: Kasahara, Y.
name: Shimono, Y.
name: Shibauchi, T.
name: Matsuda, Y.
name: Yonezawa, S.
name: Muraoka, Y.
name: Hiroi, Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: To elucidate the nature of the superconducting ground state of the geometrically frustrated pyrochlore KOs2O6 (Tc=9.6K), the thermal conductivity was measured down to low temperatures (~Tc/100). We found that the quasiparticle mean free path is strikingly enhanced below a transition at Tp=7.5K, indicating enormous electron inelastic scattering in the normal state. In a magnetic field the conduction at T ->0K is nearly constant up to ~0.4Hc2, in contrast with the rapid growth expected for superconductors with an anisotropic gap. This unambiguously indicates a fully gapped superconductivity, in contrast to the previous studies. These results highlight that KOs2O6 is unique among superconductors with strong electron correlations.
description: 5 pages, 4 figures, accepted for publication in Phys. Rev. Lett
Η χρονομεριστική μίσθωση:
Creators: name: Παπαστεργίου, Ευφροσύνη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Χρονομεριστική
Σύμβαση
Υπαναχώρηση
Timeshare
Contract
Withdrawal

description: Σκοπός της διατριβής ήταν η μελέτη της σύμβασης της χρονομεριστικής μίσθωσης. Εξετάσαμε την έννοια, την οικονομική σημασία καθώς και τους τύπους συμβάσεως της χρονομεριστικής μίσθωσης. Στη συνέχεια παρουσιάσαμε συνοπτικά την εν λόγω σύμβαση στα πλαίσια της Ευρωπαϊκής Ένωσης. Ακόμη αναφερθήκαμε αναλυτικά στη σύμβαση της χρονομεριστικής μίσθωσης σύμφωνα με το ελληνικό δίκαιο και ειδικότερα στη νομική φύση της, στον τύπο της και στο περιεχόμενό της καθώς και στα δικαιώματα και στις υποχρεώσεις των συμβαλλομένων μερών. Περαιτέρω αναλύθηκαν τα δικαιώματα υπαναχώρησης και καταγγελίας της συμβάσεως χρονομεριστικής μίσθωσης και οι έννομες συνέπειες αυτών των δικαιωμάτων. Στη συνέχεια παραθέσαμε νομολογιακά παραδείγματα για διάφορα νομικά ζητήματα που απορρέουν από το θεσμό των χρονομεριστικών μισθώσεων και σχολιάσαμε τις αποφάσεις που έχουν εκδοθεί επί αυτών μέχρι σήμερα από τα ελληνικά δικαστήρια. Τέλος ασχοληθήκαμε με τη νέα οδηγία της Ευρωπαϊκής Ένωσης για τη χρονομεριστική μίσθωση και τις αλλαγές που αυτή εισάγει.
description: The aim of the present thesis was the study of timeshare contract. We examined the meaning, the economic importance and the types of timeshare contracts. Furthermore we presented concisely the aforementioned contract in the context of European Union. Then we analysed the timeshare contract in accordance with Greek law and in particular its legal nature, its type, its content and also the rights and obligations of the participating members. We also examined the rights of withdrawal and the termination of timeshare contract and the legal effects of these rights. Additionally we quoted law case examples for various legal issues arising from the institution of timesharing and we commented on the decisions that have been issued until today by Greek courts. Finally we presented the new EU directive concerning timeshare contracts and the changes that it introduces.
LArGe: Background suppression using liquid argon (LAr) scintillation for 0$νββ$ decay search with enriched germanium (Ge) detectors
Creators: name: Di Marco, M.
name: Peiffer, P.
name: Schönert, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Measurements with a bare p-type high purity germanium diode (HPGe) submerged in a 19 kg liquid argon (LAr) scintillation detector at MPIK Heidelberg are reported. The liquid argon--germanium system (LArGe) is operated as a 4$π$ anti-Compton spectrometer to suppress backgrounds in the HPGe. This R&D is carried out in the framework of the GERDA experiment which searches for 0$νββ$ decays with HPGe detectors enriched in $^{76}$Ge. The goal of this work is to develop a novel method to discriminate backgrounds in 0$νββ$ search which would ultimately allow to investigate the effective neutrino mass free of background events down to the inverse mass hierarchy scale. Other applications in low-background counting are expected.
description: 3 pages, 6 figures, conference proceedings of the 10th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD06) 1 - 5 October 2006 Siena, Italy
Scaling Creative Inspiration with Fine-Grained Functional Aspects of Ideas
Creators: name: Hope, Tom
name: Tamari, Ronen
name: Kang, Hyeonsu
name: Hershcovich, Daniel
name: Chan, Joel
name: Kittur, Aniket
name: Shahaf, Dafna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Artificial Intelligence (cs.AI)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Large repositories of products, patents and scientific papers offer an opportunity for building systems that scour millions of ideas and help users discover inspirations. However, idea descriptions are typically in the form of unstructured text, lacking key structure that is required for supporting creative innovation interactions. Prior work has explored idea representations that were either limited in expressivity, required significant manual effort from users, or dependent on curated knowledge bases with poor coverage. We explore a novel representation that automatically breaks up products into fine-grained functional aspects capturing the purposes and mechanisms of ideas, and use it to support important creative innovation interactions: functional search for ideas, and exploration of the design space around a focal problem by viewing related problem perspectives pooled from across many products. In user studies, our approach boosts the quality of creative search and inspirations, substantially outperforming strong baselines by 50-60%.
description: To appear in CHI 2022
Heat current and entropy production rate in local non-Markovian quantum dynamics of global Markovian evolution
Creators: name: Ghoshal, Ahana
name: Sen, Ujjwal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We examine the elements of the balance equation of entropy in open quantum evolutions and their response as we go from a Markovian to a non-Markovian situation. In particular, we look at the heat current and entropy production rate in the non-Markovian reduced evolution, as well as a Markovian limit of the same, experienced by one of two interacting systems immersed in a Markovian bath. The analysis naturally leads us to define a heat current deficit and an entropy production rate deficit, which are differences between the global and local versions of the corresponding quantities. The investigation leads, in certain cases, to a complementarity of the time-integrated heat current deficit and the relative entropy of entanglement between the two systems.
description: 14 pages, 9 figures
Runaway Massive Binaries and Cluster Ejection Scenarios
Creators: name: McSwain, M. Virginia
name: Ransom, Scott M.
name: Boyajian, Tabetha S.
name: Grundstrom, Erika D.
name: Roberts, Mallory S. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The production of runaway massive binaries offers key insights into the evolution of close binary stars and open clusters. The stars HD 14633 and HD 15137 are rare examples of such runaway systems, and in this work we investigate the mechanism by which they were ejected from their parent open cluster, NGC 654. We discuss observational characteristics that can be used to distinguish supernova ejected systems from those ejected by dynamical interactions, and we present the results of a new radio pulsar search of these systems as well as estimates of their predicted X-ray flux assuming that each binary contains a compact object. Since neither pulsars nor X-ray emission are observed in these systems, we cannot conclude that these binaries contain compact companions. We also consider whether they may have been ejected by dynamical interactions in the dense environment where they formed, and our simulations of four-body interactions suggest that a dynamical origin is possible but unlikely. We recommend further X-ray observations that will conclusively identify whether HD 14633 or HD 15137 contain neutron stars.
description: Accepted to ApJ, 11 pages
Landau Gauge Gluon and Ghost Propagators from Lattice QCD
Creators: name: Ilgenfritz, E. -M.
name: Müller-Preussker, M.
name: Sternbeck, A.
name: Schiller, A.
name: Bogolubsky, I. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We report on recent numerical computations of the Landau gauge gluon and ghost propagators as well as of the ghost-gluon vertex function in pure SU(3) Yang-Mills theory and in full QCD on the lattice. Special emphasis is paid to the low momentum region. In particular, we present new data for the gluon propagator at momenta below 300 MeV. We also discuss different systematic effects as there are finite-size, lattice discretization and Gribov copy but also unquenching effects. A MOM-scheme running coupling α_s(q^2) based on the ghost-gluon vertex is calculated and found to decrease for momenta below 550 MeV, even though the renormalization constant of the vertex deviates only weakly from being constant.
description: Talk at the Workshop IRQCD '06, Rio de Janeiro, June 2006, given by M. M{\"u}ller-Preussker; 8 pages, 9 figures, a few wordings made more precise, figures put into equal style, missing legends added
Color Transparency in Semi-Inclusive Electroproduction of rho Mesons
Creators: name: Frankfurt, L.
name: Miller, G. A
name: Strikman, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the electroproduction of rho mesons in nuclei at intermediate energies, deriving a treatment of the energy lost by the rho in each step of multiple-scattering. This enables a close match between calculations and the experimental kinematic conditions. A standard Glauber calculation is presented, and then the effects of color-transparency are included. The influence of poor experimental resolution on the extracted transparency is assessed. The effects of $ρ$ meson decay inside the nucleus are examined, and are typically about 5 percent at most. This effect disappears rapidly as $Q^2$ increases from about 1 to 3 GeV$^2$, causing a rise in the transparency that is not attributable to color transparency. The size of color transparency effects for C and Fe nuclei is studied for values of $Q^2$ up to 10 GeV$^2$. The detailed results depend strongly on the assumed value of the $ρN$ cross section. The overall effects of color transparency are greater than about 10 % for both nuclear targets if $Q^2$ is greater than about 5 GeV$^2$.
description: 20 pages, 19 figures replacement adds references
Interactions Among Reverberation, WDRC, and WM (Reinhart & Souza, 2016)
Creators: name: Reinhart, Paul N.
name: Souza, Pamela E.
Publisher: name: ASHA journals
Year: 2022
Subjects: Phonetics and speech science
Speech recognition

description: Purpose: The purpose of this study was to examine the effects of varying wide dynamic range compression (WDRC) release time on intelligibility and clarity of reverberant speech. The study also considered the role of individual working memory.Method: Thirty older listeners with mild to moderately-severe sloping sensorineural hearing loss participated. Individuals were divided into high and low working memory groups on the basis of the results of a reading span test. Participants listened binaurally to sentence stimuli simulated at a range of reverberation conditions and WDRC release times using a high compression ratio. Outcome measures included objective intelligibility and subjective clarity ratings. Results: Speech intelligibility and clarity ratings both decreased as a function of reverberation. The low working memory group demonstrated a greater decrease in intelligibility with increasing amounts of reverberation than the high working memory group. Both groups, regardless of working memory, had higher speech intelligibility and clarity ratings with longer WDRC release times. WDRC release time had a larger effect on speech intelligibility under more reverberant conditions. Conclusions: Reverberation significantly affects speech intelligibility, particularly for individuals with lower working memory. In addition, longer release times in hearing aids may improve listener speech intelligibility and clarity in reverberant environments.
Hands-on to hands-off : a study of a state agency’s preservation efforts
Creators: name: Tuggey, Katherine Rebecca
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Archives
Preservation
Conservation

description: The General Land Office (GLO) is the oldest state agency in Texas. Within the agency is an archives department that acts as custodian to the records documenting the public lands of the state. Over the course of nearly two centuries, the GLO has pursued numerous preservation efforts and conservation techniques. This study reviews the preservation methods practiced by the GLO’s Archives and Records (A&R) program chronologically while discussing similar historical conservation practices. Comparisons are made to a nearby state agency, the Texas State Archives and Library Commission (TSLAC) to further explore the context of the GLO’s preservation practices.
Near-unity third-harmonic circular dichroism driven by quasi-BIC in asymmetric silicon metasurfaces
Creators: name: Gandolfi, Marco
name: Tognazzi, Andrea
name: Rocco, Davide
name: De Angelis, Costantino
name: Carletti, Luca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We use numerical simulations to demonstrate third-harmonic generation with near-unity nonlinear circular dichroism (CD) and high conversion efficiency ($ 10^{-2}\ \text{W}^{-2}$) in asymmetric Si-on-SiO$_2$ metasurfaces. The working principle relies on the selective excitation of a quasi-bound state in the continuum, characterized by a very high ($>10^5$) quality-factor. By tuning multi-mode interference with the variation of the metasurface geometrical parameters, we show the possibility of independent control of linear CD and nonlinear CD. Our results pave the way for the development of all-dielectric metasurfaces for nonlinear chiro-optical devices with high conversion efficiency.
Binary linear forms over finite sets of integers
Creators: name: Nathanson, Melvyn B.
name: O'Bryant, Kevin
name: Orosz, Brooke
name: Ruzsa, Imre
name: Silva, Manuel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11B75, 11P99, 05B10

description: Let A be a finite set of integers. For a polynomial f(x_1,...,x_n) with integer coefficients, let f(A) = {f(a_1,...,a_n) : a_1,...,a_n \in A}. In this paper it is proved that for every pair of normalized binary linear forms f(x,y)=u_1x+v_1y and g(x,y)=u_2x+v_2y with integral coefficients, there exist arbitrarily large finite sets of integers A and B such that |f(A)| > |g(A)| and |f(B)| < |g(B)|.
description: 20 pages
Band geometry from position-momentum duality at topological band crossings
Creators: name: Lin, Yu-Ping
name: Hsiao, Wei-Han
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the position-momentum duality offers a transparent interpretation of the band geometry at the topological band crossings. Under this duality, the band geometry with Berry connection is dual to the free-electron motion under gauge field. This identifies the trace of quantum metric as the dual energy in momentum space. The band crossings with Berry defects thus induce the dual energy quantization in the trace of quantum metric. For the $\mathbb Z$ nodal-point and nodal-surface semimetals in three dimensions, the dual Landau level quantization occurs owing to the Berry charges. Meanwhile, the two-dimensional (2D) Dirac points exhibit the Berry vortices, leading to the quantized dual axial rotational energies. Such a quantization naturally generalizes to the three-dimensional (3D) nodal-loop semimetals, where the nodal loops host the Berry vortex lines. The $\mathbb Z_2$ monopoles bring about additional dual axial rotational energies, which originate from the links with additional nodal lines. Nontrivial band geometry generically induces finite spread in the Wannier functions. While the spread manifest quantized lower bounds from the Berry charges, logarithmic divergences occur from the Berry vortices. The band geometry at the band crossings may be probed experimentally by a periodic-drive measurement.
description: 8 pages, 2 figures. v3: Published version
Video Reenactment as Inductive Bias for Content-Motion Disentanglement
Creators: name: Albarracín, Juan F. Hernández
name: Rivera, Adín Ramírez
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: Independent components within low-dimensional representations are essential inputs in several downstream tasks, and provide explanations over the observed data. Video-based disentangled factors of variation provide low-dimensional representations that can be identified and used to feed task-specific models. We introduce MTC-VAE, a self-supervised motion-transfer VAE model to disentangle motion and content from videos. Unlike previous work on video content-motion disentanglement, we adopt a chunk-wise modeling approach and take advantage of the motion information contained in spatiotemporal neighborhoods. Our model yields independent per-chunk representations that preserve temporal consistency. Hence, we reconstruct whole videos in a single forward-pass. We extend the ELBO's log-likelihood term and include a Blind Reenactment Loss as an inductive bias to leverage motion disentanglement, under the assumption that swapping motion features yields reenactment between two videos. We evaluate our model with recently-proposed disentanglement metrics and show that it outperforms a variety of methods for video motion-content disentanglement. Experiments on video reenactment show the effectiveness of our disentanglement in the input space where our model outperforms the baselines in reconstruction quality and motion alignment.
description: Pre-print to appear in IEEE Trans. on Image Processing. Project page, high resolution images, and source code at https://mipl.gitlab.io/mtc-vae/
An operating system architecture for real-time tasking abstractions
Creators: name: Lo, Siu Ling Ann
Publisher: name: University of British Columbia
Year: 2009

description: A flexible real-time tasking abstraction is necessary to support diversified and evolving application-level timing constraints. Previous research has focused on rigid solutions and failed to provide any insight to a more flexible design alternative. A common approach has been to implement a real-time scheduling algorithm in the operating system kernel as an integral part of the task model. When the real-time requirements of applications evolve and a new scheduling algorithm is needed, the kernel is modified. This monolithic approach is out of step with the press for software reusability when software development and maintenance costs continue to escalate. In order to explore for a flexible design, we have examined the concepts behind existing real-time task models and classified them into competitive and cooperative task models. In contrast to the common belief that they are fundamentally different, our conclusion is that although the design of these task models are incompatible with each other, their underlying concepts are not. This paves the way for our architectural design which supports evolving real-time requirements at the application level. We propose a task abstraction where tasks cooperate and participate in making real-time scheduling decisions. This design allows for the implementation of competitive task models and their scheduling algorithms on top of a common kernel. It also provides more flexibility in task structuring since applications can be structured as cooperating tasks. We have implemented our design in the Mach 3.0 kernel and the r-kernel for experimentation and for proving the practicality of our abstraction in terms of performance and consistency with the overall design of the systems. The lessons we have learnt from implementation have strengthened our belief in the importance of providing a flexible scheduling interface which can be used by the application programmer. The flexibility of our solution is illustrated by considering the demands placed on the kernel by a modern multimedia application.
Flavoured Large N Gauge Theory in an External Magnetic Field
Creators: name: Filev, Veselin G.
name: Johnson, Clifford V.
name: Rashkov, R. C.
name: Viswanathan, K. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a D7-brane probe of AdS$_{5}\times S^5$ in the presence of pure gauge $B$-field. In the dual gauge theory, the $B$-field couples to the fundamental matter introduced by the D7-brane and acts as an external magnetic field. The $B$-field supports a 6-form Ramond-Ramond potential on the D7-branes world volume that breaks the supersymmetry and enables the dual gauge theory to develop a non-zero fermionic condensate. We explore the dependence of the fermionic condensate on the bare quark mass $m_{q}$ and show that at zero bare quark mass a chiral symmetry is spontaneously broken. A study of the meson spectrum reveals a coupling between the vector and scalar modes, and in the limit of weak magnetic field we observe Zeeman splitting of the states. We also observe the characteristic $\sqrt{m_{q}}$ dependence of the ground state corresponding to the Goldstone boson of spontaneously broken chiral symmetry.
description: 22 pages, 7 figures, references added, few typos corrected
The search for Dipper stars in the Orion A Molecular Cloud Complex from NGTS survey data
Creators: name: Moulton, Tyler
name: Hodgkin, Simon
name: Gillen, Ed
name: Briegal, Josh
name: Smith, Gareth
Publisher: name: Zenodo
Year: 2021

description: Dipper stars are low-mass stellar variables which exhibit deep aperiodic drops in flux tied to dust transits in the inner disk region of these stars' circumstellar disks. Using the NGTS survey of Orion A from the 2017-2018 observing season as well as a training set of stars classified from previous Orion surveys, we apply machine learning methods towards the identification of new Dipper stars in Orion. We identify 72 new Orion dippers for a total of 81 dippers in our sample - the largest dipper population discovered and characterized in Orion to date.
Stochastic background from inspiralling double neutron stars
Creators: name: Regimbau, Tania
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We review the contribution of extra galactic inspiralling double neutron stars, to the LISA astrophysical gravitational wave foreground. Using recent fits of the star formation rate, we show that sources beyond $z_*=0.005$ contribute to a truly continuous background, which may dominate the LISA instrumental noise in the range $3 \simeq 10^{-4}$ - $1 \times 10^{-2}$ Hz and overwhelm the galactic WD-WD confusion noise at frequencies larger than $ν_o \simeq 2\times 10^{-3}$.
description: accepted for publication in physical review D 8 pages, 3 figures
The 3-dimensional structure of the prototypical young triple system T Tauri
Creators: name: Köhler, Rainer
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars

description: T Tauri is the best-observed member of the class of stars named after it, but astronomers are still debating what exactly is happening in the system. The irregular photometric variability of the triple system T Tauri has been puzzling since its discovery. A circumbinary disk around T Tau Sa and Sb can explain the recent brightness fluctuations of T Tau Sb, due to changes in extinction depending on the position of T Tau Sb in its orbit. With this contribution I present not only the recent solution for orbital parameters of this benchmark system but also the 3D configuration of circumstellar and circumbinary discs detected in the system. I give a tentative answer the long standing question is T Tau N closer or farther from us than T Tau S. The orbital motion of T Tau Sb in the near future will allow us to probe the near side of the circumbinary disk in early 2023.

description: {"references": ["Beck, T. L., Schaefer, G. H., Guilloteau, S., et al. 2020, ApJ, 902, 132", "Duch\\^ene, G., Ghez, A. M., McCabe, C., & Ceccarelli, C. 2005, ApJ, 628, 832", "Hartmann, L., Hewett, R., Stahler, S., & Mathieu, R. D. 1986, ApJ, 309, 275", "K\\\"ohler, R., and Kubiak, K. 2020, Research Notes of the AAS, 4, 73", "Schaefer, G. H., Beck, T. L., Prato, L., & Simon, M. 2020, AJ, 160, 35"]}
Accretion in the PDS 70 system
Creators: name: Thanathibodee, Thanawuth
name: Calvet, Nuria
name: Molina, Brandon
name: Bae, Jaehan
name: Serna, Javier
name: Reynolds, Mark
name: Muzerolle, James
name: Hernández, Jesús
name: Franco Hernández, Ramiro
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars

description: Theoretical studies and simulations suggest that giant planets can create gaps in circumstellar disks around young, pre-main-sequence stars. As a result, the mass accretion rate from the disk onto the star decreases significantly. Here, we evaluate that prediction and its implications by measuring the mass accretion rates onto the star PDS 70 and its proto-planets. We applied magnetospheric models to fit the multi-epoch H-alpha profiles of PDS 70 and the H-alpha fluxes of PDS 70 b/c. We found that the star's mass accretion rate varies with its rotation period, with an average of 1.3x10-10 Msun/yr. The total mass accretion rate onto the planets is only 10% of that of the star. Given the size of the gap in the disk around PDS 70, these estimates of the mass accretion rate are consistent with: (1) the disk has a high viscosity, or (2) the disk has an inner mass reservoir and a low viscosity. More observations of systems with young, accreting planets are needed to discern between these scenarios.
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MSPM: A Modularized and Scalable Multi-Agent Reinforcement Learning-based System for Financial Portfolio Management
Creators: name: Huang, Zhenhan
name: Tanaka, Fumihide
Publisher: name: arXiv
Year: 2021
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Computational Finance (q-fin.CP)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: Financial portfolio management (PM) is one of the most applicable problems in reinforcement learning (RL) owing to its sequential decision-making nature. However, existing RL-based approaches rarely focus on scalability or reusability to adapt to the ever-changing markets. These approaches are rigid and unscalable to accommodate the varying number of assets of portfolios and increasing need for heterogeneous data. Also, RL agents in the existing systems are ad-hoc trained and hardly reusable for different portfolios. To confront the above problems, a modular design is desired for the systems to be compatible with reusable asset-dedicated agents. In this paper, we propose a multi-agent RL-based system for PM (MSPM). MSPM involves two types of asynchronously-updated modules: Evolving Agent Module (EAM) and Strategic Agent Module (SAM). An EAM is an information-generating module with a DQN agent, and it receives heterogeneous data and generates signal-comprised information for a particular asset. An SAM is a decision-making module with a PPO agent for portfolio optimization, and it connects to EAMs to reallocate the assets in a portfolio. Trained EAMs can be connected to any SAM at will. With its modularized architecture, the multi-step condensation of volatile market information, and the reusable design of EAM, MSPM simultaneously addresses the two challenges in RL-based PM: scalability and reusability. Experiments on 8-year U.S. stock market data prove the effectiveness of MSPM in profit accumulation by its outperformance over five baselines in terms of accumulated rate of return (ARR), daily rate of return, and Sortino ratio. MSPM improves ARR by at least 186.5% compared to CRP, a widely-used PM strategy. To validate the indispensability of EAM, we back-test and compare MSPMs on four portfolios. EAM-enabled MSPMs improve ARR by at least 1341.8% compared to EAM-disabled MSPMs.
The Invention of Children’s Literature: The Case of the Mischievous Roald Dahl:
Creators: name: Αγγελίδου, Κυριακή Ιορδάνη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Παιδική Λογοτεχνία
Ρόαλντ Νταλ
Ψυχανάλυση
Children’s Literature
Roald Dahl
Psychoanalysis

description: Η Παιδική Λογοτεχνία είναι ένα κομμάτι της λογοτεχνίας που συχνά αγνοείται, παραβλέπεται, και σε κάποιες περιπτώσεις, δεν θεωρείται καν μέρος του λογοτεχνικού κόσμου. Ο πρώτος στόχος αυτής της διατριβής ήταν να παρουσιαστεί το γεγονός ότι η έννοια της παιδικότητας που κυριαρχεί σήμερα δεν υπήρχε από πάντα, αλλά εφευρέθηκε. Στη συνέχεια εξετάστηκε η εμφάνιση μιας λογοτεχνίας για παιδιά η οποία συνέπεσε με την εφεύρεση της «παιδικότητας» και μελετήθηκαν οι διάφοροι ορισμοί της Παιδικής Λογοτεχνίας. Στο δεύτερο μέρος αυτής της διατριβής ερευνήθηκε η άποψη ότι η Παιδική Λογοτεχνία πρέπει να περιορίζεται σε συγκεκριμένα θέματα έτσι ώστε να μην επηρεάζεται αρνητικά ή να «διαφθείρεται» ένα παιδί που διαβάζει. Αυτή η άποψη εξετάστηκε σε συνδυασμό με την Ψυχανάλυση, και πιο συγκεκριμένα τις ιδέες των Σίγκμουντ Φρόιντ και Μπρούνο Μπέτελχαϊμ, για να φανεί κατά πόσο η λογοτεχνία μπορεί να επηρεάσει τα παιδιά. Τέλος, η διατριβή εστίασε στα έργα του δημοφιλή συγγραφέα παιδικών βιβλίων, Ρόαλντ Νταλ, τα βιβλία του οποίου συχνά θεωρούνται ανατρεπτικά και ακατάλληλα για παιδιά καθώς ο ίδιος δεν συμμεριζόταν τις προσδοκίες κάποιων ανθρώπων σε σχέση με το τι είναι κατάλληλο υλικό για διάβασμα για τα παιδιά.
description: Children’s Literature is often an area of literature that is ignored, overlooked and, in some cases, not even considered a part of the literary canon. The first aim of this thesis was to present the way the notion of childhood that is still dominant today, was actually invented and did not always exist. Furthermore, I examined the emergence of a literature for children coinciding with the invention of “childhood” and studied the various definitions of Children’s Literature. The second part of this thesis looked into the idea that Children’s Literature must revolve around certain themes and subjects in order not to negatively influence the child reader or “corrupt” him/her. This idea was examined in connection with Psychoanalysis, and more specifically the ideas of Sigmund Freud and Bruno Bettelheim, to show to what extent literature may have an effect on children. Finally, the thesis focused on the works of popular children’s book author, Roald Dahl, whose books are often considered subversive and inappropriate for children since he did not always conform to some people’s expectations of suitable reading material for children.
Spectroscopy of the odd-odd fp-shell nucleus 52Sc from secondary fragmentation
Creators: name: Gade, A.
name: Janssens, R. V. F.
name: Bazin, D.
name: Brown, B. A.
name: Campbell, C. M.
name: Carpenter, M. P.
name: Cook, J. M.
name: Deacon, A. N.
name: Dinca, D. -C.
name: Freeman, S. J.
name: Glasmacher, T.
name: Kay, B. P.
name: Mantica, P. F.
name: Mueller, W. F.
name: Terry, J. R.
name: Zhu, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The odd-odd fp-shell nucleus 52Sc was investigated using in-beam gamma-ray spectroscopy following secondary fragmentation of a 55V and 57Cr cocktail beam. Aside from the known gamma-ray transition at 674(5)keV, a new decay at E_gamma=212(3) keV was observed. It is attributed to the depopulation of a low-lying excited level. This new state is discussed in the framework of shell-model calculations with the GXPF1, GXPF1A, and KB3G effective interactions. These calculations are found to be fairly robust for the low-lying level scheme of 52Sc irrespective of the choice of the effective interaction. In addition, the frequency of spin values predicted by the shell model is successfully modeled by a spin distribution formulated in a statistical approach with an empirical, energy-independent spin-cutoff parameter.
description: accepted for publication in PRC
Surface structure in simple liquid metals. An orbital free first principles study
Creators: name: Gonzalez, David J. Gonzalez Luis E.
name: Stott, Malcolm J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Molecular dynamics simulations of the liquid-vapour interfaces in simple sp-bonded liquid metals have been performed using first principles methods. Results are presented for liquid Li, Na, K, Rb, Cs, Mg, Ba, Al, Tl, and Si at thermodynamic conditions near their respective triple points, for samples of 2000 particles in a slab geometry. The longitudinal ionic density profiles exhibit a pronounced stratification extending several atomic diameters into the bulk, which is a feature already experimentally observed in liquid K, Ga, In, Sn and Hg. The wavelength of the ionic oscillations shows a good scaling with the radii of the associated Wigner-Seitz spheres. The structural rearrangements at the interface are analyzed in terms of the transverse pair correlation function, the coordination number and the bond-angle distribution between nearest neighbors. The valence electronic density profile also shows (weaker) oscillations whose phase, with respect to those of the ionic profile, changes from opposite phase in the alkalis to almost in-phase for Si.
description: 16 pages, 18 figures, 5 tables. Submitted to Phys. Rev. B
Οι απόψεις των εκπαιδευτικών Πρωτοβάθμιας Εκπαίδευσης για τη Δημιουργική Σκέψη και τη Δημιουργικότητα στο Δημοτικό Σχολείο
Creators: name: Καραφυλλίδου, Μαρία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Δημιουργικότητα
Δημιουργική Σκέψη
Πρωτοβάθμια Εκπαίδευση
Creativity
Creative Thought
Primary School

description: Σκοπός της παρούσας εργασίας ήταν η διερεύνηση των απόψεων των εκπαιδευτικών Πρωτοβάθμιας Εκπαίδευσης γενικής αγωγής σχετικά με τη δημιουργικότητα των μαθητών. Για το σκοπό αυτόν δημιουργήθηκε ένα ερωτηματολόγιο, το οποίο αποτελούνταν από τέσσερις ερωτήσεις κλειστού τύπου (οι τρεις τύπου Likert και η μία τύπου ναι-όχι) και δύο ανοικτού τύπου. Το ερωτηματολόγιο εστιάζεται κυρίως σε τέσσερις κύριους άξονες: α) τι είναι δημιουργικότητα, β) ποια είναι τα χαρακτηριστικά του δημιουργικού παιδιού, γ) τι προάγει και ενισχύει τη δημιουργικότητα και δ) ποιοι είναι οι παράγοντες που αναστέλλουν τη δημιουργική έκφραση των παιδιών. Στην έρευνα, συμμετείχαν συνολικά 250 εκπαιδευτικοί της Πρωτοβάθμιας Εκπαίδευσης, 77 και 173 γυναίκες. Τα αποτελέσματα κατέδειξαν ότι οι περισσότεροι εκπαιδευτικοί κατέχουν την έννοια της δημιουργικότητας, γνωρίζουν ότι η δημιουργικότητα είναι χαρακτηριστικό κάθε παιδιού και φαίνεται ότι καταβάλλουν προσπάθειες να την εντάξουν στην εκπαιδευτική διαδικασία που ακολουθούν. Οι συμμετέχοντες εκπαιδευτικοί, διαφοροποιούν κάποιες από τις απαντήσεις ανάλογα με την ειδικότητά τους, ενώ οι απόψεις τους δεν επηρεάζονται από την επαγγελματική τους εμπειρία, ούτε και σε μεγάλο βαθμό από την επιμόρφωση που έχουν λάβει. Ωστόσο, σύμφωνα με τα αποτελέσματα της παρούσας εργασίας, ένα μεγάλο μέρος των εκπαιδευτικών έχει την άποψη ότι όλα τα παιδιά μπορούν να είναι δημιουργικά Το τελευταίο αυτό εύρημα θα μπορούσε να αποτελέσει αντικείμενο μελλοντικών ερευνών σχετικά με τις μεθόδους ανάπτυξης της δημιουργικότητας των μαθητών.
description: The aim of this study is to examine the opinions of the primary education teachers concerning children’s creativity, the way they define creativity, and if possess the knowledge that every children has the ability to express creative behavior. For that reason, an improvised questionnaire was used, which measures creativity in for domains: definition of creativity, creative children’s characteristics, how to improve creative behavior, factors that inhibit creativity. The results showed that a great part of the teachers possess the sense of creativity, but they weren’t not aware of the possibility that each children can be creative, a finding that comes in accordance with previous researches. Furthermore, these results forces future studies to examine the techniques teachers can apply in order to promote creativity.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Νηπιαγωγών (Πανεπιστήμιο Δυτικής Μακεδονίας)