cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Orthogonal nonnegative factorization-based analysis of nineteen protein-RNA interaction CLIP data sets
Creators: name: Strazar, Martin
name: Zitnik, Marinka
name: Blaz Zupan
name: Ule, Jernej
name: Tomaz Curk
Publisher: name: F1000Research
Year: 2015

description: RNA binding proteins (RBPs) regulate different mechanisms of post-transcriptional gene expression, including splicing, RNA editing, polyadenylation, nuclear transport and RNA stability. Contemporary methods modeling protein-RNA interaction assume precise structural information, such as protein folding, which is available only for a limited number of proteins. Increasingly growing experimental data from protocols such as CLIP, iCLIP, PAR-CLIP, HITS-CLIP, enables simultaneous integrative study of different RBPs.

We developed an algorithm for orthogonal non-negative matrix factorization and used it to integrate various -omics data on protein-RNA interactions, including gene/transcript sequence, function and structure. The algorithm fuses multiple data sources by joint dimensionality reduction and discovers multiple, non-overlapping modules within the data. Exploiting synergistic relations among data sources improves prediction of interacting sites.

We analyzed protein-RNA interaction data on 19 RBPs. By visualizing and exploring the factor model, we discovered a number of biologically relevant patterns governing individual, cooperative and competitive RBP targeting of RNA sites. Many of the discovered patterns are known features governing protein-RNA interactions, including RNA structure, RNA sequence motifs and positioning, cooperation and competition in binding among proteins to same target RNAs, affinity to interact with specific types of gene regions, and functional annotation of targeted genes. We used these patterns to cluster RBPs into functionally related groups. For example, we find that hnRNP proteins bind to U-rich motifs in introns to regulate splicing (hnRNPs, U2AF2, ELAVL1, TDP-43, TAF15, FUS, QKI). Those that regulate splicing (SR), spliced mRNA (eIF3E3) or 3’UTR (Ago, IGF2BP) mRNA bind to GC-rich motifs.
A machine learning approach for protein-protein interaction prediction using rigid docking models
Creators: name: Matsuzaki, Yuri
name: Simm, Jaak
Publisher: name: F1000Research
Year: 2015

description: Protein-protein interaction (PPI) plays key roles in living systems. Predicting relevant interacting partners from their tertiary structure is a challenging topic where computer science methods have potential to contribute. Protein-protein rigid docking has been applied for this purpose by several projects. However, the prediction power is limited mainly because of poor correlation between docking score and actual protein-protein binding affinity. To improve state of the art we propose a machine learning approach to improve docking-based PPI predictions by using site-specific residue profiles obtained by rigid docking. A possible application of our method is a problem in which we have one ‘receptor’ protein and pick up proteins that have potential to interact with it from a pool of candidate ‘ligand’ proteins. We define an interface fingerprint of a pair of proteins as a collection of residues of a ‘receptor’ protein, with information of how often each residue are included in binding sites of 2000 highest scoring docking models. To examine if interactors and non-interactors can be discriminated using this profile, we first used binding residues of known protein complexes to construct the profiles. We applied multiple methods of machine learning to discriminate binders and non-binders using those profiles as input. In this poster we present an evaluation of our method by applying it to proteins of Protein Docking Benchmark ver. 4.0.
Whole exome sequencing reveals mutations in NARS2 and PARS2, encoding the mitochondrial asparaginyl-tRNA synthetase and prolyl-tRNA synthetase, in patients with Alpers syndrome
Creators: name: Davila, Marcela
name: Asin-Cayuela Jorge
Publisher: name: F1000Research
Year: 2015

description: Alpers syndrome is a progressive neurodegenerative disorder that presents in infancy or early childhood and is characterized by diffuse degeneration of cerebral gray matter. While mutations in POLG1, the gene encoding the gamma subunit of the mitochondrial DNA polymerase, have been associated with Alpers syndrome with liver failure (Alpers–Huttenlocher syndrome), the genetic cause of Alpers syndrome in most patients remains unidentified. With whole exome sequencing we have identified mutations in NARS2 and PARS2, the genes encoding the mitochondrial asparaginyl- and prolyl-tRNA synthetases, in two patients with Alpers syndrome. One of the patients was homozygous for a missense mutation (c.641C>T, p.P214L) in NARS2. The affected residue is predicted to be located in the stem of a loop that participates in dimer interaction. (Figure 1) The other patient was compound heterozygous for a one base insertion (c.1130dupC, p.K378 fs*1) that creates a premature stop codon and a missense mutation (c.836C>T, p.S279L) located in a conserved motif of unknown function in PARS2 (Figure 2). This report links for the first time mutations in these genes to human disease in general and to Alpers syndrome in particular.
Το γένος Hieracium L. s.l. στο Νομό Χαλκιδικής
Creators: name: Μελικώκη, Κωνσταντίνα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Χαλκιδική
Hieracium
Pilosella
Chalkidiki

description: Στη παρούσα έρευνα καταγράφηκαν και περιγράφηκαν τα taxa του γένους Hieracium s.l. που φύονται στο Νομό Χαλκιδικής και στο Άγιο Όρος, για τα οποία συντάχθηκαν κλείδες προσδιορισμού. Από την έρευνα στο πεδίο και τη μελέτη της σχετικής βιβλιογραφίας, προέκυψε ότι εμφανίζονται 46 taxa (11 μόνο στο Άγιο Όρος), από τα οποία 18 taxa ανήκουν στο γένος Pilosella και 28 στο γένος Hieracium s.str. Πρόκειται για στενότοπα taxa (Ελληνικά, Βαλκανικά ή Υποβαλκανικά) με ποσοστό 56,09% και ευρύτοπα taxa (Ευρωπαϊκά ή Ευρασιατικά) με ποσοστό 43,91%. Τα Ελληνικά ενδημικά taxa παρουσιάζουν σχετικά υψηλό ποσοστό συμμετοχής (19,51%). Αναφέρονται τρία νέα είδη (P. flagellaris, H, maculatum, H. klisurae) για τον ελληνικό χώρο και περιγράφονται τρία νέα υποείδη (H. transiens subsp. levimaculatum, H. sparsum subsp. cholomonense, H. bohatschianum subsp. onosmoidiforme) για την επιστήμη. Τα taxa του γένους Hieracium s.l. βρέθηκαν κυρίως στη ζώνη των δασών δρυός, σε υψόμετρα από 400-1040 m, προτιμώντας τις δασικές εκτάσεις από τις καλιεργημένες ή τις εκτάσεις κοντά σε ανθρωπογενείς δραστηριότητες. Εξαίρεση αποτελεί το Pilosella bauhini subsp. magyarica, το οποίο εμφανίζεται σχεδόν σε όλους τους βιοτόπους, σε όλα τα υψομετρικά εύρη και το P. piloselloides που εμφανίζεται σχεδόν σε όλα τα υψομετρικά εύρη. Τέλος, καταρτίστηκαν πίνακες με το είδος και την αφθονία του τριχώματος των διάφορων φυτικών μερών των taxa, καθώς αυτό αποτελεί βασικό διαγνωστικό χαρακτήρα.
description: In this study taxa of the genus Hieracium s.l., grown in the prefecture of Chalkidiki and Athos Mountain were recorded and described. For these taxa identification keys were compiled. Research in the field and study of the literature showed that 46 taxa (11 only to Mount Athos) occur in the area, 18 of which belong to the genus Pilosella and 28 to the genus Hieracium s.str. These taxa are consisted of narrowly distributed taxa of the examined chorological spectrum (Greek, Balkan and Sub-Balkan endemics) with a percentage of 56,09% and of widely distributed taxa (European or Eurasian) with a percentage of 43,91%. The Greek endemic taxa have a relatively high participation rate (19.51%). In the area three new species for Greece (P. flagellaris, H. maculatum, H. klisurae) were colected, and three new subspecies for science were discribed (H. transiens subsp. levimaculatum, H. sparsum subsp. cholomonense, H. bohatschianum subsp. onosmoidiforme) enriching further the Greek flora. The taxa of the genus Hieracium s.l. were found mostly in Quercus forests, at altitudes 400-1100 m, preferring wooded areas than areas close to humman activities. Exception is Pilosella bauhini subsp. magyarica, which appears in almost all habitats and altitude ranges and P. piloselloides that appears in almost all elevation ranges. Finally, tables with the type and abundance of hair of different parts of plant taxa were created, as this provides a diagnostic character.
Bam2Drug: A novel cancer pipeline for complete characterization of WGS/WES data
Creators: name: Djordje Klisic
Publisher: name: F1000Research
Year: 2015

description: The Seven Bridges Genomics cancer pipeline combines the most efficient open source variant callers and cancer-related databases into a 90-node pipeline, patched with a few auxiliary tools and in-house algorithms developed mainly for prioritisation of SNPs/CNVs. Its performance on both WGS and WES tumor – normal pairs is an excellent solution in terms of speed, price, completeness and quality of results. From the initial BAM files one gets a list of drugs and the best candidate somatic mutations in the end. While the pipeline strongly relies on the COSMIC entries, it provides a step further towards clinical applications of NGS in cancer medicine.
Anomalies in Fermionic UV Completions of Little Higgs Models
Creators: name: Krohn, David
name: Yavin, Itay
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider fermionic UV completions of little Higgs models and their associated T-parity violating anomalous vertices. In particular, we investigate strategies to avoid such parity-violating anomalies. We show that it is unlikely a QCD-like UV completion could be used to implement a model with anomaly-free global symmetry groups. This is because the vacuum state is unlikely to achieve the necessary alignment. However, we will see that certain multi-link moose models, although anomalous, possess a modified form of T-parity that leads to a stable particle. Finally, we briefly discuss a discriminant for detecting anomalous decays at colliders.
description: Sign error corrected and as a result some of the conclusions were revisited
Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect
Creators: name: Qin, Y. -P.
name: Su, C. -Y.
name: Fan, J. H.
name: Gupta, A. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have investigated the gamma-ray bursts pulses assumed to arise from relativistically expending fireballs. We find, due to the curvature effect, the evolutionary curve of the raw hardness ratio (when the background count is included) varies significantly, depending on the hardness of a burst. For a soft burst, an upside-down pulse of its raw hardness ratio curve (HRC) would be observed; for a hard burst, its raw HRC shows a pulse-like profile with a sinkage in its decaying phase; for a very hard burst, the raw HRC possesses a pulse-like profile without a sinkage in its decaying phase. For a pulse-like raw HRC as shown in the case of the hard and very hard bursts, its peak would appear in advance of that of the corresponding light curve. We have studied here the HRC of GRB 920216, GRB 920830 and GRB 990816 in detail. The features of the raw HRC expected in the hard burst are observed in these bursts. A fit to the three bursts shows that the curvature effect alone could indeed account for the predicted characteristics of HRCs. In addition, we find that the observed hardness ratio tends to be harder at the beginning of the pulses than what the curvature effect could predict and be softer at the late time of the pulses. We believe this is an evidence showing the existence of intrinsic hard-to-soft radiation.
description: 26 pages, 8 figures, 1 table
The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections
Creators: name: Albarrán, M. L. Gutiérrez
name: Montes, D.
name: Garrido, M. Gómez
name: Tabernero, H. M.
name: Hernández, J. I. Gónzalez
name: Marfil, E.
name: Frasca, A.
name: Lanzafame, A. C.
name: Klutsch, A.
name: Franciosini, E.
name: Randich, S.
name: Smiljanic, R.
name: Korn, A. J.
name: Gilmore, G.
name: Alfaro, E. J.
name: Baratella, M.
name: Bayo, A.
name: Bensby, T.
name: Bonito, R.
name: Carraro, G.
name: Mena, E. Delgado
name: Feltzing, S.
name: Gonneau, A.
name: Heiter, U.
name: Hourihane, A.
name: Esteban, F. Jiménez
name: Jofre, P.
name: Masseron, T.
name: Monaco, L.
name: Morbidelli, L.
name: Prisinzano, L.
name: Roccatagliata, V.
name: Sousa, S.
name: Van der Swaelmen, M.
name: Worley, C. C.
name: Zaggia, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Previous studies of open clusters have shown that lithium depletion is not only strongly age dependent but also shows a complex pattern with other parameters that is not yet understood. For pre- and main-sequence late-type stars, these parameters include metallicity, mixing mechanisms, convection structure, rotation, and magnetic activity. We perform a thorough membership analysis for a large number of stars observed within the Gaia-ESO survey (GES) in the field of 20 open clusters, ranging in age from young clusters and associations, to intermediate-age and old open clusters. Based on the parameters derived from the GES spectroscopic observations, we obtained lists of candidate members for each of the clusters in the sample by deriving RV distributions and studying the position of the kinematic selections in the EW(Li) versus Teff plane to obtain lithium members. We used gravity indicators to discard field contaminants and studied [Fe/H] metallicity to further confirm the membership of the candidates. We also made use of studies using recent data from the Gaia DR1 and DR2 releases to assess our member selections. We identified likely member candidates for the sample of 20 clusters observed in GES (iDR4) with UVES and GIRAFFE, and conducted a comparative study that allowed us to characterize the properties of these members, as well as identify field contaminant stars, both lithium-rich giants and non-giant outliers. This work is the first step towards the calibration of the lithium-age relation and its dependence on other GES parameters. During this project we aim to use this relation to infer the ages of GES field stars, and identify their potential membership to young associations and stellar kinematic groups of different ages.
description: 264 pages, 105 figures. To be published in A&A, accepted 29th July 2020
Velocity-Metallicity Correlation for high-z DLA Galaxies: Evidence for a Mass-Metallicity Relation?
Creators: name: Ledoux, C.
name: Petitjean, P.
name: Fynbo, J. P. U.
name: Moller, P.
name: Srianand, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We used our database of VLT-UVES quasar spectra to build up a sample of 70 Damped Lyman-alpha (DLA) or strong sub-DLA systems with total neutral hydrogen column densities of log N(HI)>20 and redshifts in the range 1.72.43) and the lower (z_abs<2.43) redshift halves of our sample. However, the two populations of systems are statistically different. There is a strong redshift evolution in the sense that the mean metallicity and mean velocity width increase with decreasing redshift. We argue that the existence of a DLA velocity-metallicity correlation, over more than a factor of 100 spread in metallicity, is probably the consequence of an underlying mass-metallicity relation for the galaxies responsible for DLA absorption lines. Assuming a simple linear scaling of the galaxy luminosity with the mass of the dark-matter halo, we find that the slope of the DLA velocity-metallicity relation is consistent with that of the luminosity-metallicity relation derived for local galaxies. [...] abridged.
description: 10 pages, 4 figures, A&A in press
Light emission is fundamentally tied to the quantum coherence of the emitting particle
Creators: name: Karnieli, Aviv
name: Rivera, Nicholas
name: Arie, Ady
name: Kaminer, Ido
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Coherent emission of light by free charged particles is ubiquitous in many areas of physics and engineering, with the light's properties believed to be successfully captured by classical electromagnetism in all relevant experimental settings. The advent of interactions between light and free quantum matter waves brought about fundamental questions regarding the role of the particle wavefunction. Here we show that even in seemingly classical experimental regimes, light emission is fundamentally tied to quantum properties of the emitting particles, such as their quantum coherence and correlations. By employing quantum electrodynamics, we unveil the role of the particle's coherent momentum uncertainty, without which decoherence of light becomes dominant. As an example, we consider Cherenkov radiation, envisioned for almost a century as a shockwave of light. We find instead that the shockwave's duration is fundamentally bound from below by the particle's coherent momentum uncertainty due to the underlying entanglement between the particle and light. This quantum optical paradigm opens new capabilities in analytical electron microscopy, enabling the measurement of quantum correlations of shaped electron wavepackets. Our findings also have applications for Cherenkov detectors in particle physics. For example, by measuring spectral photon autocorrelations, one can unveil the particle's wavefunction size, shape and coherence. Such schemes are especially intriguing for many high-energy particles, where other techniques are not available.
Optimal exploitation of renewable resource stocks: Necessary conditions
Creators: name: Baumeister, J.
name: Leitao, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 49N90, 49K15, 91B76, 92D40

description: We study a model for the exploitation of renewable stocks developed in Clark et al. (Econometrica 47 (1979), 25-47). In this particular control problem, the control law contains a measurable and an impulsive control component. We formulate Pontryagin's maximum principle for this kind of control problems, proving first order necessary conditions of optimality. Manipulating the correspondent Lagrange multipliers we are able to define two special switch functions, that allow us to describe the optimal trajectories and control policies nearly completely for all possible initial conditions in the phase plane.
description: 31 pages, 4 figures
Identifying Documents In-Scope of a Collection from Web Archives
Creators: name: Patel, Krutarth
name: Caragea, Cornelia
name: Phillips, Mark
name: Fox, Nathaniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: Digital Libraries (cs.DL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Web archive data usually contains high-quality documents that are very useful for creating specialized collections of documents, e.g., scientific digital libraries and repositories of technical reports. In doing so, there is a substantial need for automatic approaches that can distinguish the documents of interest for a collection out of the huge number of documents collected by web archiving institutions. In this paper, we explore different learning models and feature representations to determine the best performing ones for identifying the documents of interest from the web archived data. Specifically, we study both machine learning and deep learning models and "bag of words" (BoW) features extracted from the entire document or from specific portions of the document, as well as structural features that capture the structure of documents. We focus our evaluation on three datasets that we created from three different Web archives. Our experimental results show that the BoW classifiers that focus only on specific portions of the documents (rather than the full text) outperform all compared methods on all three datasets.
description: 10 pages
Η εκπαιδευτική πολιτική και η τεχνική και επαγγελματική εκπαίδευση στην Ελλάδα
Creators: name: Ιακωβίδης, Γεώργιος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 36 (2003)
Quantum size effects in a one-dimensional semimetal
Creators: name: Farhangfar, Shadyar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study theoretically the quantum size effects in a one-dimensional semimetal by a Boltzmann transport equation. We derive analytic expressions for the electrical conductivity, Hall coefficient, magnetoresistance, and the thermoelectric power in a nanowire. The transport coefficients of semimetal oscillate as the size of the sample shrinks. Below a certain size the semimetal evolves into a semiconductor. The semimetal-semiconductor transition is discussed quantitatively. The results should make a theoretical ground for better understanding of transport phenomena in low-dimensional semimetals. They can also provide useful information while studying low-dimensional semiconductors in general.
description: 5 pages in PDF; LaTeX source
Design of achromatic augmented reality visors based on composite metasurfaces
Creators: name: Bayati, Elyas
name: Wolfram, Andrew
name: Colburn, Shane
name: Huang, Luocheng
name: Majumdar, Arka
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: A compact near-eye visor (NEV) system that can guide light from a display to the eye could transform augmented reality (AR) technology. Unfortunately, existing implementations of such an NEV either suffer from small field of view or chromatic aberrations. See-through quality and bulkiness further make the overall performance of the visors unsuitable for a seamless user experience. Metasurfaces are an emerging class of nanophotonic elements that can dramatically reduce the size of optical elements while enhancing functionality. In this paper, we present a design of composite metasurfaces for an ultra-compact NEV. We simulate the performance of a proof-of-principle visor corrected for chromatic aberrations while providing a large display field of view (>77° both horizontally and vertically), good see-through quality (>70% transmission and less than a wavelength root mean-square (RMS) wavefront error over the whole visible wavelength range), as needed for an immersive AR experience.
description: Applied Optics
Generalized Thermostatistics and Bose-Einstein Condensation
Creators: name: Miller, H. G.
name: Khanna, F. C.
name: Teshima, R.
name: Plastino, A. R.
name: Plastino, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Analytical expressions for Bose-Einstein condensation of an ideal Bose gas analyzed within the strictures of non-extensive, generalized thermostatistics are here obtained.
New High Proper Motion Stars from the Digitized Sky Survey. IV. Completion of the Southern Survey and 170 Additional Stars with pm>0.45 arcsec/yr
Creators: name: Lepine, Sebastien
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Completion of the SUPERBLINK proper motion survey in the southern celestial hemisphere has turned up 170 new stars with proper motion 0.45 arcsec/yr < pm < 2.0 arcsec/yr. This fourth and final installment completes the all-sky, data-mining of the Digitized Sky Surveys for stars with large proper motions. The areas investigated in this final installment comprise 11,600 square degrees in the declination range -30 degrees < Decl. <0 degrees, and in low galactic latitude areas south of Decl.= -30 degrees which had not been covered in earlier data releases. Astrometric and photometric data are provided for the 170 new stars, along with finder charts. Most of the new discoveries are found in densely populated fields along the Milky Way, towards the Galactic bulge/center. The list of new discoveries includes 4 stars with proper motion pm >1.0 arcsec/yr. The total list of high proper motion stars recovered by SUPERBLINK in the southern sky now includes 2,228 stars with proper motions 0.45 arcsec/yr < pm <2.0 arcsec/yr.
description: To appear in the Astronomical Journal. Version 2 includes minor corrections
RANC: Reconfigurable Architecture for Neuromorphic Computing
Creators: name: Mack, Joshua
name: Purdy, Ruben
name: Rockowitz, Kris
name: Inouye, Michael
name: Richter, Edward
name: Valancius, Spencer
name: Kumbhare, Nirmal
name: Hassan, Md Sahil
name: Fair, Kaitlin
name: Mixter, John
name: Akoglu, Ali
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Hardware Architecture (cs.AR)
subject: Emerging Technologies (cs.ET)
subject: FOS: Computer and information sciences

description: Neuromorphic architectures have been introduced as platforms for energy efficient spiking neural network execution. The massive parallelism offered by these architectures has also triggered interest from non-machine learning application domains. In order to lift the barriers to entry for hardware designers and application developers we present RANC: a Reconfigurable Architecture for Neuromorphic Computing, an open-source highly flexible ecosystem that enables rapid experimentation with neuromorphic architectures in both software via C++ simulation and hardware via FPGA emulation. We present the utility of the RANC ecosystem by showing its ability to recreate behavior of the IBM's TrueNorth and validate with direct comparison to IBM's Compass simulation environment and published literature. RANC allows optimizing architectures based on application insights as well as prototyping future neuromorphic architectures that can support new classes of applications entirely. We demonstrate the highly parameterized and configurable nature of RANC by studying the impact of architectural changes on improving application mapping efficiency with quantitative analysis based on Alveo U250 FPGA. We present post routing resource usage and throughput analysis across implementations of Synthetic Aperture Radar classification and Vector Matrix Multiplication applications, and demonstrate a neuromorphic architecture that scales to emulating 259K distinct neurons and 73.3M distinct synapses.
description: 18 pages, 12 figures, accepted for publication in IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems. For associated source files see https://github.com/UA-RCL/RANC
Improved forecasts for the baryon acoustic oscillations and cosmological distance scale
Creators: name: Seo, Hee-Jong
name: Eisenstein, Daniel J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the cosmological distance errors achievable using the baryon acoustic oscillations as a standard ruler. We begin from a Fisher matrix formalism that is upgraded from Seo & Eisenstein (2003). We isolate the information from the baryonic peaks by excluding distance information from other less robust sources. Meanwhile we accommodate the Lagrangian displacement distribution into the Fisher matrix calculation to reflect the gradual loss of information in scale and in time due to nonlinear growth, nonlinear bias, and nonlinear redshift distortions. We then show that we can contract the multi-dimensional Fisher matrix calculations into a 2-dimensional or even 1-dimensional formalism with physically motivated approximations. We present the resulting fitting formula for the cosmological distance errors from galaxy redshift surveys as a function of survey parameters and nonlinearity, which saves us going through the 12-dimensional Fisher matrix calculations. Finally, we show excellent agreement between the distance error estimates from the revised Fisher matrix and the precision on the distance scale recovered from N-body simulations.
description: Submitted to ApJ, 21 pages, LaTeX
Near-Infrared interferometry of Eta Carinae with high spatial and spectral resolution using the VLTI and the AMBER instrument
Creators: name: Weigelt, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first NIR spectro-interferometry of the LBV Eta Carinae. The K band observations were performed with the AMBER instrument of the ESO Very Large Telescope Interferometer using three 8.2m Unit Telescopes with baselines from 42 to 89m. The aim of this work is to study the wavelength dependence of Eta Car's optically thick wind region with a high spatial resolution of 5 mas (11 AU) and high spectral resolution. The medium spectral resolution observations (R=1,500) were performed in the wavelength range around both the HeI 2.059 micron and the Br gamma 2.166 micron emission lines, the high spectral resolution observations (R=12,000) only in the Br gamma line region. In the K-band continuum, a diameter of 4.0 +/-0.2 mas (Gaussian FWHM, fit range 28-89m) was measured for Eta Car's optically thick wind region. If we fit Hillier et al. (2001) model visibilities to the observed AMBER visibilities, we obtain 50 % encircled-energy diameters of 4.2, 6.5 and 9.6mas in the 2.17 micron continuum, the HeI, and the Br gamma emission lines, respectively. In the continuum near the Br gamma line, an elongation along a position angle of 120+/-15 degrees was found, consistent with previous VLTI/VINCI measurements by van Boekel et al. (2003). We compare the measured visibilities with predictions of the radiative transfer model of Hillier et al. (2001), finding good agreement. Furthermore, we discuss the detectability of the hypothetical hot binary companion. For the interpretation of the non-zero differential and closure phases measured within the Br gamma line, we present a simple geometric model of an inclined, latitude-dependent wind zone. Our observations support theoretical models of anisotropic winds from fast-rotating, luminous hot stars with enhanced high-velocity mass loss near the polar regions.
description: 22 pages, 14 figures, 2 tables; A&A in press
On inverse problems modeled by PDE's
Creators: name: Leitao, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65J20, 47A52

description: We investigate the iterative methods proposed by Maz'ya and Kozlov (see [3], [4]) for solving ill-posed reconstruction problems modeled by PDE's. We consider linear time dependent problems of elliptic, hyperbolic and parabolic types. Each iteration of the analyzed methods consists on the solution of a well posed boundary (or initial) value problem. The iterations are described as powers of affine operators, as in [4]. We give alternative convergence proofs for the algorithms, using spectral theory and some functional analytical results (see [5], [6]).
description: 13 pages 5 figures. arXiv admin note: substantial text overlap with arXiv:2011.14441
A roadmap for the design of four-terminal spin valves and the extraction of spin diffusion length
Creators: name: Fourneau, Emile
name: Silhanek, Alejandro V.
name: Nguyen, Ngoc D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Graphene is a promising substrate for future spintronics devices owing to its remarkable electronic mobility and low spin-orbit coupling. Hanle precession in spin valve devices is commonly used to evaluate the spin diffusion and spin lifetime properties. In this work, we demonstrate that this method is no longer accurate when the distance between inner and outer electrodes is smaller than six times the spin diffusion length, leading to errors as large as 50% for the calculations of the spin figures of merit of graphene. We suggest simple but efficient approaches to circumvent this limitation by addressing a revised version of the Hanle fit function. Complementarily, we provide clear guidelines for the design of four-terminal spin valves able to yield flawless estimations of the spin lifetime and the spin diffusion coefficient.
description: 7 pages, 5 figures
Impact of DC bias on Weak Optical-Field-Driven Electron Emission in Nano-Vacuum-Gap Detectors
Creators: name: Turchetti, Marco
name: Bionta, Mina R.
name: Yang, Yujia
name: Ritzkowsky, Felix
name: Candido, Denis Ricardo
name: Flatté, Michael
name: Berggren, Karl K.
name: Keathley, Phillip D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this work, we investigate multiphoton and optical-field tunneling emission from metallic surfaces with nanoscale vacuum gaps. Using time-dependent Schrodinger equation (TDSE) simulations, we find that the properties of the emitted photocurrent in such systems can be greatly altered by the application of only a few-volt DC bias. We find that when coupled with expected plasmonic enhancements within the nanometer-scale metallic gaps, the application of this DC bias significantly reduces the threshold for the transition to optical-field-driven tunneling from the metal surface, and could sufficiently enhance the emitted photocurrents, to make it feasible to electronically tag fJ ultrafast pulses at room temperature. Given the petahertz-scale instantaneous response of the photocurrents, and the low effective capacitance of thin-film nanoantenna devices that enables < 1 fs response time, detectors that exploit this bias-enhanced surface emission from nanoscale vacuum gaps could prove to be useful for communication, petahertz electronics, and ultrafast optical-field-resolved metrology.
A CFT description of the BTZ black hole: topology versus geometry (or thermodynamics versus statistical mechanics
Creators: name: Maiella, G.
name: Stornaiolo, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we review the properties of the black hole entropy in the light of a general conformal field theory treatment. We find that the properties of horizons of the BTZ black holes in ADS_{3}, can be described in terms of an effective unitary CFT_{2} with central charge c=1 realized in terms of the Fubini-Veneziano vertex operators. It is found a relationship between the topological properties of the black hole solution and the infinite algebra extension of the conformal group in 2D, SU(2,2), i.e. the Virasoro Algebra, and its subgroup SL(2,Z) which generates the modular symmetry. Such a symmetry induces a duality for the black hole solution with angular momentum J\neq 0. On the light of such a global symmetry we reanalyze the Cardy formula for CFT_{2} and its possible generalization to D>2 proposed by E. Verlinde.
description: 21 pages
Climbing three-Reggeon ladders: four-loop amplitudes in the high-energy limit in full colour
Creators: name: Falcioni, Giulio
name: Gardi, Einan
name: Milloy, Calum
name: Vernazza, Leonardo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using an iterative solution of rapidity evolution equations, we compute partonic $2\to 2$ gauge theory amplitudes at four loops in full colour up to the Next-to-Next-to-Leading Logarithms (NNLL) in the Regge limit. By contrasting the resulting amplitude with the exponentiation properties of soft singularities we determine the four-loop correction to the soft anomalous dimension at this logarithmic accuracy, which universally holds in any gauge theory. We find that the latter features quartic Casimir contributions beyond those appearing in the cusp anomalous dimension. Finally, in the case of ${\cal N}=4$ super Yang-Mills, we also determine the finite hard function at four loops through NNLL in full colour.
description: 6 pages, 3 figures
Dark Matter Density Profiles in Dwarf Galaxies: Linking Jeans Modeling Systematics and Observation
Creators: name: Chang, Laura J.
name: Necib, Lina
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The distribution of dark matter in dwarf galaxies can have important implications on our understanding of galaxy formation as well as the particle physics properties of dark matter. However, accurately characterizing the dark matter content of dwarf galaxies is challenging due to limited data and complex dynamics that are difficult to accurately model. In this paper, we apply spherical Jeans modeling to simulated stellar kinematic data of spherical, isotropic dwarf galaxies with the goal of identifying the future observational directions that can improve the accuracy of the inferred dark matter distributions in the Milky Way dwarf galaxies. We explore how the dark matter inference is affected by the location and number of observed stars as well as the line-of-sight velocity measurement errors. We use mock observation to demonstrate the difficulty in constraining the inner core/cusp of the dark matter distribution with datasets of fewer than 10,000 stars. We also demonstrate the need for additional measurements to make robust estimates of the expected dark matter annihilation signal strength. For the purpose of deriving robust indirect detection constraints, we identify Ursa Major II, Ursa Minor, and Draco as the systems that would most benefit from additional stars being observed.
description: 27+16 pages, 12+17 figures
Additional file 1 of Using augmented reality technology for balance training in the older adults: a feasibility pilot study
Creators: name: Blomqvist, Sven
name: Seipel, Stefan
name: Engström, Maria
Publisher: name: figshare
Year: 2021
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1.
Gauge Theory for Finite-Dimensional Dynamical Systems
Creators: name: Gurfil, Pini
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Gauge theory is a well-established concept in quantum physics, electrodynamics, and cosmology. This theory has recently proliferated into new areas, such as mechanics and astrodynamics. In this paper, we discuss a few applications of gauge theory in finite-dimensional dynamical systems with implications to numerical integration of differential equations. We distinguish between rescriptive and descriptive gauge symmetry. Rescriptive gauge symmetry is, in essence, re-scaling of the independent variable, while descriptive gauge symmetry is a Yang-Mills-like transformation of the velocity vector field, adapted to finite-dimensional systems. We show that a simple gauge transformation of multiple harmonic oscillators driven by chaotic processes can render an apparently "disordered" flow into a regular dynamical process, and that there exists a remarkable connection between gauge transformations and reduction theory of ordinary differential equations. Throughout the discussion, we demonstrate the main ideas by considering examples from diverse engineering and scientific fields, including quantum mechanics, chemistry, rigid-body dynamics and information theory.
Investigating Binary Properties with Next-Generation Microlensing Surveys
Creators: name: Han, Cheongho
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore the usefulness of future gravitational microlensing surveys in the study of binary properties such as the binary fraction and the distributions of binary separation and mass ratio by using the binary sample detectable through a channel of repeating events. For this, we estimate the rate of repeating microlensing eventstoward the Galactic bulge field based on standard models of dynamical and physical distributions of Galactic matter combined with models of binary separation and mass function. From this, we find that the total number of repeating events expected to be detected from $\sim 4$-year space-based surveys will be $\sim 200$--400, that is $\sim 40$--50 times higher than the rate of current surveys. We find that the high detection rate is due to the greatly improved sensitivity to events associated with faint source stars and low-magnification events. We find that the separation range of the binaries to be covered by the repeating events will extend up to 100 AU. Therefore, the future lensing surveys will provide a homogeneous sample that will allow to investigate the statistical properties of Galactic binaries unbiased by brightness of the binary components.
description: total 6 pages, including 4 figures, ApJ, in press
Additional file 1 of Optimization of whole-genome sequencing of Plasmodium falciparum from low-density dried blood spot samples
Creators: name: Teyssier, Noam B.
name: Chen, Anna
name: Duarte, Elias M.
name: Sit, Rene
name: Greenhouse, Bryan
name: Sofonias K. Tessema
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Table S1. PCR conditions for sWGA amplification using modified sWGA primers. Table S2. Estimates of parasite densities from extracted DBS and WGA reactions. Figure S1: Comparison of genomic dropout of Saponin-Chelex, QIAamp-Investigator kit, and QIAamp-Mini for each sWGA and parasite densities from 10 parasites/uL to 10000 parasites/uL. The read depth for each sample was 20M reads. Figure S2: Percentiles of coverage for QIAamp-Mini for 1000 parasites/uL at a read depth of 40M reads. Comparison of effects of sWGA and rWGA with McrBC.
Additional file 2 of Testing early warning and response systems through a full-scale exercise in Vietnam
Creators: name: Clara, Alexey
name: Dao, Anh T. P.
name: Tran, Quy
name: Tran, Phu D.
name: Dang, Tan Q.
name: Nguyen, Huong T.
name: Tran, Quang D.
name: Rzeszotarski, Peter
name: Talbert, Karen
name: Stehling-Ariza, Tasha
name: Veasey, Frances
name: Clemens, Lynne
name: Mounts, Anthony W.
name: Lofgren, Hannah
name: S. Arunmozhi Balajee
name: Do, Trang T.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer

description: Additional file 2: Table S2. List of communicable diseases to be reported in Vietnam. This file contains the current list of communicable diseases to be reported by the surveillance system in Vietnam.
Αντικοινωνική συμπεριφορά Ελληνοκυπρίων μαθητών Γ' τάξης Γυμνασίου στο σχολικό χώρο
Creators: name: Σκούρος, Τρύφωνας
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: This article refers to a research which was conducted in Cyprus in December 2000. According to the results, which constitute the answers to the research questions: 1) Greek-Cypriot students of the third gymnasium grade do not display eleven prespecified forms of antisocial behavior (threats, violence, insults, noise etc.) often. 2) The students' gender affects significantly at the 0,05 level the frequency of display of all forms of antisocial behavior. 3) The students' general record, according to the rneta-analysis, affects at the same significant level the frequency of display of three out of eleven forms of antisocial behavior.
description: Παιδαγωγική Επιθεώρηση, Vol. 35 (2003)
Ανάπτυξη κώδικα και GUI για σχεδίαση στοιχειοκεραιών με το λογισμικό Matlab
Creators: name: Σοφούλης, Νικόλαος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Κεραίες
Σύνθεση στοιχειοκεαριών
Γραφικό Περιβάλλον Χρήστη
Antennas
Synthesis of antenna arrays
GUI

description: Οι στοιχειοκεραίες αποτελούν βασική κατηγορία κεραιών με τις οποίες επιτυγχάνεται η δημιουργία ακτινοβολούντων διατάξεων με προκαθορισμένα χαρακτηριστικά λειτουργίας, που υπαγορεύονται από την εκάστοτε εφαρμογή στην οποία θα χρησιμοποιηθούν οι κεραίες. Πέραν των ομοιόμορφων στοιχειοκεραιών, στη βιβλιογραφία προτείνεται σημαντικός αριθμός μεθοδολογιών σχεδίασης στοιχειοκεραιών που έχουν σαν στόχο τον έλεγχο, με βάση συγκεκριμένες προδιαγραφές, των χαρακτηριστικών ακτινοβολίας της κεραίας. Μέθοδοι όπως η σχεδίαση με θεωρία πολυωνύμων Chebyshev, η ανάπτυξη του παράγοντα διάταξης σε σειρά Fourier, η μέθοδος δειγματοληψίας Woodward-Lawson και η μέθοδος ορθοκανονικοποίησης αποτελούν τεχνικές σχεδίασης που χρησιμοποιούν δεδομένη μαθηματική περιγραφή του διαγράμματος ακτινοβολίας με στόχο να συνθέσουν μια στοιχειοκεραία που να το παράγει. Στην παρούσα εργασία συντάχθηκε κώδικας και αντίστοιχο γραφικό περιβάλλον χρήστη, για τη σχεδίαση τριών από τους βασικούς τύπους των κεραιών που χρησιμοποιούνται σε εφαρμογές: ομοιόμορφων β)πολυωνυμικών Chebyshev και γ)με μέθοδο δειγματοληψίας Woodward-Lawson. Το λογισμικό αναπτύχθηκε στο προγραμματιστικό περιβάλλον του Matlab. Στην εργασία παρουσιάζονται βασικά στοιχεία της θεωρίας σχεδίασης των κεραιών των τύπων αυτών και πραγματοποιείται αναλυτική παρουσίαση, συνοδευόμενη από παραδείγματα, του λογισμικού που αναπτύχθηκε
description: Antenna arrays constitute a basic category of antennas by which it is possible to create radiating structures with predefined features of operation, which are dictated from the relative application at which antennas will be used. In the literature, apart from uniform arrays, it is introduced a significant number of designing methods of antenna arrays which aim to control, as regards to special specifications, the features of radiation of antenna. Methods of designing like the utilization of Chebyshev polynomials, the expansion of the array factor with Fourier series, the sampling method Woodward-Lawson as well as the orthogonal method are ways of designing ,based on the use a given mathematical expression of the desired radiation pattern and aim to compose an antenna array which will produce it. In this work code was developed and the corresponding Graphical User Interface was created for the design of three of basic types of antennas: a) Uniform, b) by using Chebyshev Polynomials and c) by using the sampling method of Woodward-Lawson. The software was synthesized in the programming environment of Matlab. In the work, basic elements of theory of antenna operation and designing are presented. Moreover analytical presentation of the synthesized software code and GUI along with application examples are also presented.