cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Εξατομικευμένες προτάσεις προϊόντων σε διαδικτυακές αγορές
Creators: name: Σταματιάδης, Σταμάτης Σταμάτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Σύστημα συστάσεων
Έμμεση ανατροφοδότηση
Έλλειψη πυκνότητας
Recommender system
Implicit feedback
Sparsity

description: Η παρούσα εργασία αποτελεί μία προσπάθεια αντιμετώπισης του προβλήματος της ελλιπούς πυκνότητας το οποίο παρατηρείται κατά την εφαρμογή των συστημάτων συστάσεων σε περιβάλλοντα ηλεκτρονικού εμπορίου. Ενώ οι περισσότερες εργασίες βασίζονται σε ειδικά στάδια προεπεξεργασίας άμεσης ανατροφοδότησης, εναλλακτικές προσεγγίσεις προτείνουν την αξιοποίηση ενός μικρού ποσοστού των δεδομένων έμμεσης ανατροφοδότησης. Σχεδόν σε όλες τις περιπτώσεις, τα δεδομένα περιλαμβάνουν πληροφορίες σχετικά με τις αγορές των χρηστών ενός ηλεκτρονικού καταστήματος. Η εργασία παρουσιάζει μία νέα λύση στο πρόβλημα ελλιπούς πυκνότητας αξιοποιώντας μεγαλύτερο όγκο δεδομένων έμμεσης ανατροφοδότησης που σχετίζονται με επιπλέον ενέργειες των χρηστών.
description: This work is an attempt to alleviate the problem of sparsity, observed during the application of recommender systems in an e-commerce environment. While most of the relevant work is based on special preprocessing of explicit feedback, alternative solutions propose exploiting only a tiny fraction of available implicit feedback. In most cases, the data includes only the purchase events of e-shop users. This work presents a novel solution to the sparsity problem by taking advantage of extra implicit data based on the actions users make during their online shopping experience.
Immunological outcomes of neverapin (NVP) versus efafrenz (EFV) based antiretroviral therapy ( ART ) regimen among children on ART : A study from Black Lion Hospital , Addis Ababa , Ethiopia
Creators: name: Abebe Sorsa
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Antiretroviral therapy has reduced HIV - related morbidity and mortality substantially. WHO r ecommends the use of Nevirapin e or Efavirenz as first line combined with two from nucleoside re verse transcriptase inhibitors. In this study the immunological outcomes of Neverapin versus Efafrenz based ART was assessed. Medical records of patients were retrieved and important variable s were captured to standard questionnaire. Medical records of 120 patients from NVP - based regimen and 60 patients from EFV groups were revi s ed. The CD4 cell count at the start of HAART ranged from 3 - 2003 cell/ml with an inter quartile range (IQR) of 231 - 31 7 cell/ml among NVP group. And among patients taking EFV based ART regimen, baseline CD4 count ranged 13 - 2095 cell/ml with an IQR range of 250 - 345 cell/ml. After six months of HAART, the CD4 cell count of NVP based regimen range from 71 - 2300 c/ml with IQR of 458 - 612 c/ml, and mean CD4 cell count difference of 215, 95% CI (175.414 - 245.613). From EFV based group, CD4 count ranged from 65 - 2100 c/ml with IQR of 435 - 605 c/ml, and the mean CD4 cell count difference of 205, 95% CI (155.404 - 235.623). The immunolo gical recovery was found to be comparable among the two groups. Advanced clinical stage of the disease, severe immune suppression, presence of anemia, presence of chronic diarrhea , poor weight gain during first six months of ART were adversely affected th e trends of CD4 recovery. This research report demonstrated that immunological outcomes were comparable among patient taking NVP vs EFV based ART regimen.
Discovery of a remarkable subpulse drift pattern in PSR B0818-41
Creators: name: Bhattacharyya, B.
name: Gupta, Y.
name: Gil, J.
name: Sendyk, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a remarkable subpulse drift pattern in the relatively less studied wide profile pulsar, B0818-41, using high sensitivity GMRT observations. We find simultaneous occurrence of three drift regions with two different drift rates: an inner region with steeper apparent drift rate flanked on each side by a region of slower apparent drift rate. Furthermore, these closely spaced drift bands always maintain a constant phase relationship. Though these drift regions have significantly different values for the measured P2, the measured P3 value is the same and equal to 18.3 P1. We interpret the unique drift pattern of this pulsar as being created by the intersection of our line of sight (LOS) with two conal rings on the polar cap of a fairly aligned rotator (inclination angle alpha ~ 11 deg), with an ``inner'' LOS geometry (impact angle beta ~ -5.4 deg). We argue that both the rings have the same values for the carousel rotation periodicity P4 and the number of sparks Nsp. We find that Nsp is 19-21 and show that it is very likely that, P4 is the same as the measured P3, making it a truly unique pulsar. We present results from simulations of the radiation pattern using the inferred parameters, that support our interpretations and reproduce the average profile as well as the observed features in the drift pattern quite well.
description: 5 pages and 7 figures, Accepted for publication in MNRAS Letters
Pion correlations in hydro-inspired models with resonances
Creators: name: Florkowski, W.
name: Broniowski, W.
name: Kisiel, A.
name: Pluta, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The effects of the freeze-out hypersurface and resonance decays on the pion correlation functions in relativistic heavy-ion collisions are studied with help of the hydro-inspired models with single freeze-out. The heavy-ion Monte-Carlo generator THERMINATOR is used to generate hadronic events describing production of particles from a thermalized and expanding source. We find that the short-lived resonances increase the pionic HBT radii by about 1 fm. We also find that the pion HBT data from RHIC are fully compatible with the single freeze-out scenario provided a special choice of the freeze-out hypersurface is made.
description: talk presented by WF at XLVI Cracow School of Theoretical Physics, 27.05.06 - 05.06.06, Zakopane
Easy Accessibility to Trains From Low Level Platform
Creators: name: Sanket Nawale
Publisher: name: figshare
Year: 2021
Subjects: subject: 90603 Industrial Electronics
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 90203 Automotive Mechatronics
subject: FOS: Mechanical engineering

description: Modern express trains in India face the problem of having a higher floor level than the current platform level. It is also seen in new rakes and coaches that there is a substantial gap in between the train floor and the platform. This proves to be a challenge to some people who needs to climb a set of near vertical exterior steps to reach the train floor level from the platform level. Accidents occur when people misstep and fall down in the gaps too. Simple solutions can eliminate this problem. In India, the floor height of express and long-distance trains is not compatible with the platform height and changes. In most cases, the distance increases beyond comfort limit of the passengers. The problem becomes more prominent when people struggle to climb abroad and get down from trains on to the platforms because of steep exterior steps which often lead to accidents and injuries. This is mostly seen with small kids, women, elderly, people with arthritis and others and also while moving heavy luggage in and out of the train. In all the above cases, a simple construction of platform risers and gap fillers can make a huge difference. So from above problems, the solution is to make a folding step mechanism which will be fill the height and the gap between the platform and the AC 3-Tier Sleeper Coaches.
Magnetic states of quasi-one-dimensional iron chalcogenide Ba$_2$FeS$_3$
Creators: name: Zhang, Yang
name: Lin, Ling-Fang
name: Alvarez, Gonzalo
name: Moreo, Adriana
name: Dagotto, Elbio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Quasi-one-dimensional iron-based ladders and chains, with the 3$d$ iron electronic density $n = 6$, are attracting considerable attention. Recently, a new iron chain system Ba$_2$FeS$_3$, also with $n = 6$, was prepared under high-pressure and high-temperature conditions. Here, the magnetic and electronic phase diagrams are theoretically studied for this quasi-one-dimensional compound. Based on first-principles calculations, a strongly anisotropic one-dimensional electronic band behavior near the Fermi level was observed. In addition, a three-orbital electronic Hubbard model for this chain was constructed. Introducing the Hubbard and Hund couplings and studying the model via the density matrix renormalization group (DMRG) method, we studied the ground-state phase diagram. A robust staggered $\uparrow$-$\downarrow$-$\uparrow$-$\downarrow$ AFM region was unveiled in the chain direction, consistent with our density functional theory (DFT) calculations. Furthermore, at intermediate Hubbard $U$ coupling strengths, this system was found to display an orbital selective Mott phase (OSMP) with one localized orbital and two itinerant metallic orbitals. At very large $U/W$ ($W$ = bandwidth), the system displays Mott insulator characteristics, with two orbitals half-filled and one doubly occupied. Our results for high pressure Ba$_2$FeS$_3$ provide guidance to experimentalists and theorists working on this one-dimensional iron chalcogenide chain material.
description: 13 pages, 15 figures
Fast & accurate emulation of two-body scattering observables without wave functions
Creators: name: Melendez, J. A.
name: Drischler, C.
name: Garcia, A. J.
name: Furnstahl, R. J.
name: Zhang, Xilin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Materials Science (cond-mat.mtrl-sci)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We combine Newton's variational method with ideas from eigenvector continuation to construct a fast & accurate emulator for two-body scattering observables. The emulator will facilitate the application of rigorous statistical methods for interactions that depend smoothly on a set of free parameters. Our approach begins with a trial $K$ or $T$ matrix constructed from a small number of exact solutions to the Lippmann--Schwinger equation. Subsequent emulation only requires operations on small matrices. We provide several applications to short-range potentials with and without the Coulomb interaction and partial-wave coupling. It is shown that the emulator can accurately extrapolate far from the support of the training data. When used to emulate the neutron-proton cross section with a modern chiral interaction as a function of 26 free parameters, it reproduces the exact calculation with negligible error and provides an over 300x improvement in CPU time.
description: 9 pages, 6 figures; minor updates, close to published version
Subject habitual tone marking, relative clause extraposition, logophor
Creators: name: Guebeapo, Léocadie
name: Jarvis, Rebecca
name: Russell, Katherine
name: Kapner, Julianne
name: Kouadio, Timothée
name: Tang, Chelsea
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: ebr

description: Elicitaton of pronouns, relative-clause extraposition, and 'take a picture.'
Assessment of Prevalence and Risk Factors of Depression among A dults in Gilgel Gibe Field Research Center, South West Ethiopia
Creators: name: Gebi Hussien, Markos Tesfaye
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Depression is a significant contributor to the global burden of disease and affects people in all communities across the world. Previously conducted studies in Ethiopia have consistently shown that depression is common problem in the country. There is limited scientific data regarding the association of independent variables with depression in Ethiopia and study area. Objective: To assess prevalence and associated factors with depression among adults in Gilgel-Gibe Field Research Center. Method: Population based cross-sectional study on chronic non-communicable diseases was conducted in the study area in 2008. Data were collected from random sample of 4,371 individuals on major risk factors of these diseases. In our study we processed and analyzed these data using SPSS for windows version 16.0. Multivariate logistic regressions were carried out, association between independent variables and depression was measured using adjusted odds ratios and 95% confidence interval and P-value below 0.05 was considered statistically significant. Results: Finding of the study showed that prevalence of reported and measured depression was 1.7% and 7.4% respectively. Females were 1.62 times more likely to have depression compared to males (AOR=1.62, 95% CI: 1.07, 2.44). Twelve months alcohol users were 3.23 times more likely to have depression compared to non-users (AOR=3.23, 95% CI: 1.17, 8.88). Respondents having two and above chronic diseases were 2.18 times more likely to have depression compared to those free of the diseases (AOR=2.18, 95% CI: 1.15, 4.13) Conclusion: Sex, alcohol use and number of chronic diseases were found to be independent predictors of depression
A direct and differential imaging search for sub-stellar companions to epsilon Indi A
Creators: name: Geissler, K.
name: Kellner, S.
name: Brandner, W.
name: Masciadri, E.
name: Hartung, M.
name: Henning, T.
name: Lenzen, R.
name: Close, L.
name: Endl, M.
name: Kuerster, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have carried out a direct and differential imaging search for sub-stellar companions to eps Indi A using the adaptive optics system NACO at the ESO VLT. The observations were carried out in September 2004 with NACO/SDI as well as with NACO's S27 camera in the H and Ks filters. The SDI data cover an area of \~2.8" around eps Indi A. No detection was achieved in the inner neighbourhood down to 53 Mj (5 sigma confidence level) at a separation > 0.4" (1.45 AU) and down to 21 Mj for separations > 1.3" (4.7 AU). To cover a wider field of view, observations with the S27 camera and a coronagraphic mask were obtained. We detected a faint source at a separation of (7.3 +/- 0.1)" and a position angle of (302.9 +/- 0.8) degree. The photometry for the candidate companion yields m(H)=(16.45 +/- 0.04)mag and m(Ks) = (15.41 +/- 0.06)mag, respectively. Those magnitudes and the resulting color (H-Ks) = (1.04 +/- 0.07)mag fit best to a spectral type of L5 - L9.5 if it is bound. Observations done with HST/NICMOS by M. Endl have shown the source to be a background object.
description: 6 pages, 5 figures, accepted by A&A
A non-recursive border finding algorithm for linear quadtree based images
Creators: name: Tang, Shao Kang
Publisher: name: University of British Columbia
Year: 2009

description: Given a digital binary image represented in a linear quadtree, its border is to be found as another linear quadtree. A new algorithm is proposed that can generate the border in sorted order. A pattern is found for the order of the edge pixels of a node. The differences of the location codes for the edge pixels of a node with grouping factor g is stored in a lookup table. The lookup table also provides the information about which edge a given pixel is on. Through a probabilistic analysis, the new algorithm is able to avoid recursion which reduces the number of neighbour finding operations significantly. The algorithm performs better, when compared to the one by Yang & Lin, in both the run time (40% improvement) and the number of neighbour finding operations incurred (60% reduction).
Τα ηλεκτρονικά δίκτυα διανομής: Οι ιδιαιτερότητές τους και η ρήτρα γεωγραφικής αποκλειστικότητας
Creators: name: Σταύρου, Παναγιώτης Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Διανομή
Εμπορική Αντιπροσωπεία
Ρήτρα Γεωγραφικής Αποκλειστικότητας
Distribution
Commercial Agency
Territorial Protection Clause

description: Η διπλωματική εργασία αφορά τα ηλεκτρονικά δίκτυα διανομής. Δηλαδή, δίκτυα διανομής που χρησιμοποιούν για την εμπορία των προϊόντων τους οποιοδήποτε ηλεκτρονικό μέσο και ιδίως το διαδίκτυο. Το ζήτημα που δημιουργείται είναι κατά πόσο μπορεί να τεθεί μια ρήτρα εδαφικής προστασίας σε δίκτυα διανομής που δραστηριοποιούνται στο διαδίκτυο, το οποίο όμως χαρακτηρίζεται από έλλειψη εδαφικότητας. Όσον αφορά τώρα τη ρήτρα της εδαφικής προστασίας αρχικά διαδραματίζει σπουδαίο ρόλο σε όλα τα παραδοσιακά δίκτυα διανομής πλην του δικτύου επιλεκτικής διανομής, όπου ο όρο της περιοχής αποκλειστικότητας δεν είναι επιτρεπτός. Στα συστήματα αποκλειστικής διανομής μάλιστα αποτελεί απαραίτητο όρο η παραχώρηση περιοχής αποκλειστικότητας. Όσον αφορά το σύστημα δικαιόχρησης στο Διαδίκτυο γίνεται δεκτό πως επιτρέπονται οι παθητικές πωλήσεις ενώ υφίσταται η δυνατότητα απαγόρευσης των ενεργητικών πωλήσεων. Στο δίκτυο εμπορικής αντιπροσωπείας από την άλλη, το οποίο λόγω της φύσης του, τίθεται εκτός πεδίου εφαρμογής του αρ.101 ΣΛΕΕ, μπορούν να περιοριστούν τόσο οι παθητικές πωλήσεις όσο και η ίδια η χρήση του διαδικτύου. Δεν ισχύουν όμως τα ίδια και για τα δίκτυα διανομής όταν αυτά δραστηριοποιούνται στο χώρο του διαδικτύου, όπου μια ρήτρα αποκλειστικότητας δε θα μπορούσε να σταθεί.
description: The thesis concerns electronic distribution networks. That is, distribution networks which use any electronic means for the marketing of their products, in particular the internet. The question arises as to whether a territorial protection clause can be introduced into distribution networks operating on the Internet, although Internet is characterized by a lack of territoriality. As far as the Territorial Protection Clause is concerned, it initially plays an important role in all traditional distribution networks other than the selective distribution network, where the term of the exclusivity area is not permissible. In exclusive distribution systems, a reserved area is a prerequisite. As far as the franchise system on the Internet is concerned, it is accepted that passive sales are permitted while there is the possibility of prohibiting active sales. The dealership network, on the other hand, which, by its nature, falls outside the scope of Article 101 LTEU, both passive sales and the use of the Internet itself can be limited. However, they do not apply to distribution networks when they operate on the Internet, where an exclusivity clause can not stand.
Charm as a domain wall fermion in quenched lattice QCD
Creators: name: Lin, Huey-Wen
name: Ohta, Shigemi
name: Soni, Amarjit
name: Yamada, Norikazu
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We report a study describing the charm quark by a domain-wall fermion (DWF) in lattice quantum chromodynamics (QCD). Our study uses a quenched gauge ensemble with the DBW2 rectangle-improved gauge action at a lattice cutoff of $a^{-1} \sim 3$ GeV. We calculate masses of heavy-light (charmed) and heavy-heavy (charmonium) mesons with spin-parity $J^P = 0^\mp$ and $1^\mp$, leptonic decay constants of the charmed pseudoscalar mesons ($D$ and $D_s$), and the $D^0$-$\bar{D^0}$ mixing parameter. The charm quark mass is found to be $m^{\bar{\rm MS}}_{c}(m_{c})=1.24(1)(18)$ GeV. The mass splittings in charmed-meson parity partners $Δ_{q,J=0}$ and $Δ_{q, J=1}$ are degenerate within statistical errors, in accord with experiment, and they satisfy a relation $Δ_{q=ud, J} > Δ_{q=s, J}$, also consistent with experiment. A C-odd axial vector charmonium state, $h_c), lies 22(11) MeV above the $χ_{c1}$ meson, or $m_{h_{c}} = 3533(11)_{\rm stat.}$ MeV using the experimental $χ_{c1}) mass. However, in this regard, we emphasize significant discrepancies in the calculation of hyperfine splittings on the lattice. The leptonic decay constants of $D$ and $D_s$ mesons are found to be $f_D=232(7)_{\rm stat.}(^{+6}_{-0})_{\rm chiral}(11)_{\rm syst.}$ MeV and $f_{D_s}/f_{D} = 1.05(2)_{\rm stat.}(^{+0}_{-2})_{\rm chiral}(2)_{\rm syst.}$, where the first error is statistical, the second a systematic due to chiral extrapolation and the third error combination of other known systematics. The $D^0$-$\bar{D^0}$ mixing bag parameter, which enters the $ΔC = 2$ transition amplitude, is found to be $B_D(2{GeV})=0.845(24)_{\rm stat.}(^{+24}_{-6})_{\rm chiral}(105)_{\rm syst.}$.
description: 49 pages, 15 figures
Teichmueller space via Kuranishi families
Creators: name: Arbarello, Enrico
name: Cornalba, Maurizio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 14H15; 30F60; 32G15

description: We construct Teichmueller space by patching together Kuranishi families. We also discuss the basic properties of Teichmueller space, and in particular show that our construction leads to simplifications in the proof of Teichmueller's theorem asserting that the genus g Teichmueller space is homeomorphic to a (6g-6)-dimensional ball.
description: 26 pages; minor mistakes corrected, references added and corrected
Non-equilibrium dynamics of the open quantum $O(n)$-model with non-Markovian noise: exact results
Creators: name: Wald, Sascha
name: Henkel, Malte
name: Gambassi, Andrea
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The collective and purely relaxational dynamics of quantum many-body systems after a quench at temperature $T=0$, from a disordered state to various phases is studied through the exact solution of the quantum Langevin equation of the spherical and the $O(n)$-model in the limit $n\to\infty$. The stationary state of the quantum dynamics is shown to be a non-equilibrium state. The quantum spherical and the quantum $O(n)$-model for $n\to\infty$ are in the same dynamical universality class. The long-time behaviour of single-time and two-time correlation and response functions is analysed and the universal exponents which characterise quantum coarsening and quantum ageing are derived. The importance of the non-Markovian long-time memory of the quantum noise is elucidated by comparing it with an effective Markovian noise having the same scaling behaviour and with the case of non-equilibrium classical dynamics.
description: 41 pages, 8 figures, final version
On the occurrence of Berezinskii-Kosterlitz-Thouless behavior in highly anisotropic cuprate superconductors
Creators: name: Schneider, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The conflicting observations in the highly anisotropic Bi2Sr2CaCu2O8+x, vidence for BKT behavior emerging from magnetization data and smeared 3D-xy behavior, stemming form the temperature dependence of the magnetic in-plane penetration depth are traced back to the rather small ratio, gsic+/gsic-=0.45, between the c-axis correlation length probed above (+) and below (-) Tc, and the comparatively large anisotropy. The latter leads to critical amplitudes gsic0+,-which are substantially smaller than the distance between two CuO2 double layers. In combination with gsic+/gsic-=0.45 and in contrast to the situation below Tc the c-axis correlation length gsic exceeds the distance between two CuO2 double layers very close to Tc only. Below this narrow temperature regime where 3D-xy fluctuations dominate, there is then an extended temperature regime where the units with two CuO2 double layers are nearly uncoupled so that 2D thermal fluctuations dominate and BKT features are observable.
description: 4 pages, 4 figures
A Fast and Accurate Nonlinear Spectral Method for Image Recognition and Registration
Creators: name: Costa, Luciano da Fontoura
name: Bollt, Erik
Publisher: name: arXiv
Year: 2006
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Geometry (cs.CG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: This article addresses the problem of two- and higher dimensional pattern matching, i.e. the identification of instances of a template within a larger signal space, which is a form of registration. Unlike traditional correlation, we aim at obtaining more selective matchings by considering more strict comparisons of gray-level intensity. In order to achieve fast matching, a nonlinear thresholded version of the fast Fourier transform is applied to a gray-level decomposition of the original 2D image. The potential of the method is substantiated with respect to real data involving the selective identification of neuronal cell bodies in gray-level images.
description: 4 pages, 3 figures
Evidence of a pressure-induced metallization process in monoclinic VO$_2$
Creators: name: Arcangeletti, E.
name: Baldassarre, L.
name: Di Castro, D.
name: Lupi, S.
name: Malavasi, L.
name: Marini, C.
name: Perucchi, A.
name: Postorino, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Raman and combined trasmission and reflectivity mid infrared measurements have been carried out on monoclinic VO$_2$ at room temperature over the 0-19 GPa and 0-14 GPa pressure ranges, respectively. The pressure dependence obtained for both lattice dynamics and optical gap shows a remarkable stability of the system up to P*$\sim$10 GPa. Evidence of subtle modifications of V ion arrangements within the monoclinic lattice together with the onset of a metallization process via band gap filling are observed for P$>$P*. Differently from ambient pressure, where the VO$_2$ metal phase is found only in conjunction with the rutile structure above 340 K, a new room temperature metallic phase coupled to a monoclinic structure appears accessible in the high pressure regime, thus opening to new important queries on the physics of VO$_2$.
description: 5 pages, 3 figures
Eikonal quasinormal modes of black holes beyond general relativity III: scalar Gauss-Bonnet gravity
Creators: name: Bryant, Albert
name: Silva, Hector O.
name: Yagi, Kent
name: Glampedakis, Kostas
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a recent series of papers we have shown how the eikonal/geometrical optics approximation can be used to calculate analytically the fundamental quasinormal mode frequencies associated with coupled systems of wave equations, which arise, for instance, in the study of perturbations of black holes in gravity theories beyond General Relativity. As a continuation to this series, we here focus on the quasinormal modes of nonrotating black holes in scalar Gauss-Bonnet gravity assuming a small-coupling expansion. We show that the axial perturbations are purely tensorial and are described by a modified Regge-Wheeler equation, while the polar perturbations are of mixed scalar-tensor character and are described by a system of two coupled wave equations. When applied to these equations, the eikonal machinery leads to axial modes that deviate from the general relativistic results at quadratic order in the Gauss-Bonnet coupling constant. We show that this result is in agreement with an analysis of unstable circular null orbits around blackholes in this theory, allowing us to establish the geometrical optics-null geodesic correspondence for the axial modes. For the polar modes the small-coupling approximation forces us to consider the ordering between eikonal and small-coupling perturbative parameters; one of which we show, by explicit comparison against numerical data, yields the correct identification of the quasinormal modes of the scalar-tensor coupled system of wave equations. These corrections lift the general relativistic degeneracy between scalar and tensorial eikonal quasinormal modes at quadratic order in Gauss-Bonnet coupling in a way reminiscent of the Zeeman effect. In general, our analytic, eikonal quasinormal mode frequencies (normalized to the General Relativity ones) agree with numerical results with an error of $\sim 10\%$ in the regime of small coupling constant. (abridged)
description: 15 pages, 4 figures; accepted to PRD
A detailed study of X-ray cavities in the intracluster environment of the cool core cluster Abell 3017
Creators: name: Pandge, M. B.
name: Sebastian, Biny
name: Seth, Ruchika
name: Raychaudhury, Somak
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a detailed analysis of a cool-core galaxy cluster Abell 3017, at a redshift of z=0.219, which has been identified to be merging with its companion cluster Abell 3016. This study has made use of X-ray Chandra, UV (GALEX), optical (ESO/VLT), mid-infrared (WISE), and radio uGMRT observations of this cluster. Using various image processing techniques, such as unsharp masking, 2-d fits using Beta models, contour binning and the use of surface brightness profiles, we show the existence of a pair of X-ray cavities, at a projected distance of $\sim$20'' (70 kpc) and $\sim$16'' (57 kpc), respectively from the core of Abell~3017. We also detect an excess of X-ray emission located at 25'' $\sim$(88 kpc) south of the centre of Abell 3017, is likely due to the bulk motions in the ICM either by gas sloshing or ram-pressure striping due to a merger. We find that the radio lobes are responsible for the observed X-ray cavities detected in this system. The lower values of the mid-IR WISE colour [W1-W2] and [W2-W3] imply that the central BCG of Abell~3017 is a star-forming galaxy. The current star formation rate of the central BCG, estimated from the ${\rm Hα}$ and GALEX FUV luminosities, are equal to be $\sim 5.06\pm 0.78$ Msun yr$^{-1}$ and $\sim 9.20\pm 0.81$ Msun yr$^{-1}$, respectively. We detect, for the first time, a radio phoenix $\sim$150 kpc away from the radio core, with a spectral index of ($α\!\leq\! -1.8$). We also report the detection of $\rm~Pa_α$ emission in this cluster using ESO VLT SINFONI imaging data.
description: 13 pages, 13 figures, 7 Tables, Accepted for publication in MNRAS
COVID-19 detection from scarce chest x-ray image data using few-shot deep learning approach
Creators: name: Jadon, Shruti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In the current COVID-19 pandemic situation, there is an urgent need to screen infected patients quickly and accurately. Using deep learning models trained on chest X-ray images can become an efficient method for screening COVID-19 patients in these situations. Deep learning approaches are already widely used in the medical community. However, they require a large amount of data to be accurate. The open-source community collectively has made efforts to collect and annotate the data, but it is not enough to train an accurate deep learning model. Few-shot learning is a sub-field of machine learning that aims to learn the objective with less amount of data. In this work, we have experimented with well-known solutions for data scarcity in deep learning to detect COVID-19. These include data augmentation, transfer learning, and few-shot learning, and unsupervised learning. We have also proposed a custom few-shot learning approach to detect COVID-19 using siamese networks. Our experimental results showcased that we can implement an efficient and accurate deep learning model for COVID-19 detection by adopting the few-shot learning approaches even with less amount of data. Using our proposed approach we were able to achieve 96.4% accuracy an improvement from 83% using baseline models.
description: 10 pages, 5 figures. Proceedings Volume 11601, Medical Imaging 2021: Imaging Informatics for Healthcare, Research, and Applications
Superconductivity-induced spectral weight transfer due to quantum geometry
Creators: name: Ahn, Junyeong
name: Nagaosa, Naoto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Optical spectral weight transfer associated with the onset of superconductivity at high energy scales compared with the superconducting gap has been observed in several systems such as high-$T_c$ cuprates. While there are still debates on the origin of this phenomenon, a consensus is that it is due to strong correlation effects beyond the BCS theory. Here we show that there is another route to a nonzero spectral weight transfer based on the quantum geometry of the conduction band in multiband systems. We discuss applying this idea to the cuprates and twisted multilayer graphene.
description: 7 pages, 3 figures, accepted version
Anisotropic cosmological models in Horndeski gravity
Creators: name: Galeev, Rafkat
name: Muharlyamov, Ruslan
name: Starobinsky, Alexei A.
name: Sushkov, Sergey V.
name: Volkov, Mikhail S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It was found recently that the anisotropies in the homogeneous Bianchi I cosmology considered within the context of a specific Horndeski theory are damped near the initial singularity instead of being amplified. In this work we extend the analysis of this phenomenon to cover the whole of the Horndeski family. We find that the phenomenon is absent in the K-essence and/or Kinetic Gravity Braiding theories, where the anisotropies grow as one approaches the singularity. The anisotropies are damped at early times only in more general Horndeski models whose Lagrangian includes terms quadratic and cubic in second derivatives of the scalar field. Such theories are often considered as being inconsistent with the observations because they predict a non-constant speed of gravitational waves. However, the predicted value of the speed at present can be close to the speed of light with any required precision, hence the theories actually agree with the present time observations. We consider two different examples of such theories, both characterized by a late self-acceleration and an early inflation driven by the non-minimal coupling. Their anisotropies show a maximum at intermediate times and approach zero at early and late times. The early inflationary stage exhibits an instability with respect to inhomogeneous perturbations, suggesting that the initial state of the universe should be inhomogeneous. However, more general Horndeski models may probably be stable.
description: 21 pages, several figures
Diagonalization of the neutralino mass matrix and boson-neutralino interaction
Creators: name: Beylin, V. A.
name: Kuksa, V. I.
name: Pasechnik, R. S.
name: Vereshkov, G. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze a connection between neutralino mass sign, parity and structure of the neutralino-boson interaction. Correct calculation of spin-dependent and spin-independent contributions to neutralino-nuclear scattering should consider this connection. A convenient diagonalization procedure, based on the exponetial parametrization of unitary matrix, is suggested.
description: 21 pages, RevTex4
Impact of Multiplicity Fluctuations on Entropy Scaling Across System Size
Creators: name: Carzon, Patrick
name: Sievert, Matthew D.
name: Noronha-Hostler, Jacquelyn
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The initial state is one of the greatest uncertainties in heavy-ion collisions. A model-agnostic approach is taken in the phenomenological Trento framework which constrains parameters using Bayesian analysis. However, the color-glass condensate (CGC) effective theory predicts initial energy densities that lie outside the recent Bayesian analyses due, in part, to the assumption in Trento of event-by-event multiplicity fluctuations following a $Γ$ distribution. We compare the Trento-preferred $\sqrt{T_{A}T_{B}}$ scaling to CGC-like $T_{A}T_{B}$ scaling coupled with log-normal fluctuations in $AuAu$ and $dAu$ collisions and find there is a significant impact on the multiplicity distributions and on the eccentricities, which may affect the extraction of viscosity in small systems.
description: 9 pages, 9 figures
Excitonic States in Medium-Size Quantum Dots
Creators: name: Odriazola, Alexander
name: Delgado, Alain
name: Gonzalez, Augusto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In a quantum dot with dozens of electrons, an approximation beyond Tamm-Dankoff is used to construct the quantum states with an additional electron-hole pair, i.e. the "excitonic" states. The lowest states mimic the non-interacting spectrum, but with excitation gaps renormalized by Coulomb interactions. At higher excitation energies, the computed density of energy levels shows an exponential increase with energy. In the interband absorption, we found a background level in the quasicontinuum of states rising linearly with the excitation energy. Above this background, there are distinct peaks related to single resonances or to groups of many states with small interband dipole moments.
description: 6 pages, 4 figs, final version, as published
Discolopeus copeus Stiller 2019, sp.n.
Creators: name: Stiller, Michael
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Discolopeus
Discolopeus copeus

description: Discolopeus copeus sp.n.
Holotype male in SANC. Paratypes in BMNH, INHS and SANC.
description: Published as part of Stiller, Michael, 2019, Validation of Discolopeus Stiller, 2019 and corrections to figures, pp. 189-191 in Zootaxa 4585 (1) on page 189, DOI: 10.11646/zootaxa.4585.1.11, http://zenodo.org/record/2636169
Μεταμοσχεύσεις Οργάνων και Ποινική Ευθύνη του Ιατρού
Creators: name: Γεωργίου, Αντώνιος Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Μεταμοσχεύσεις οργάνων
Ποινική ευθύνη του ιατρού
Αφαίρεση οργάνων
Organ transplant
Doctor’s criminal liability
Organ abscission

description: Σκοπός της διπλωματικής ήταν η συστηματοποιημένη προσπάθεια αποσαφήνισης και οριοθέτησης της ποινικής ευθύνης του ιατρού, που συμμετέχει στις μεταμοσχεύσεις, σύμφωνα με το Ποινικό Δίκαιο της χώρας μας σε συνδυασμό με τον Νόμο 3984/2011 περί μεταμοσχεύσεων οργάνων και τον Κώδικα Ιατρικής Δεοντολογίας. Αρχικά, έγινε αναφορά στις προϋποθέσεις που θέτει ο νόμος 3984/2011 για το νόμιμο των μεταμοσχεύσεων και στις βασικές αρχές που πρέπει να τις διαπνέουν, ενώ ακολούθησε η ανάλυση της προϋπόθεσης της συναίνεσης του δότη και του ασθενούς-λήπτη, η οποία έχει σημαίνουσα θέση στην όλη διαδικασία της μεταμόσχευσης, δεδομένου ότι οι ως άνω προϋποθέσεις, σε συνδυασμό με την ενημερωμένη συναίνεση του δότη, αίρουν τον άδικο χαρακτήρα της πράξης του ιατρού και συγκεκριμένα της αφαίρεσης οργάνου από ζώντα δότη. Στη συνέχεια, αναλύθηκε το χρονικό σημείο επέλευσης του θανάτου, από το οποίο, μάλιστα, εξαρτάται το επιτρεπτό της μεταμόσχευσης οργάνου από εγκεφαλικά νεκρό δότη, καθώς η διαπίστωση του εγκεφαλικού θανάτου αποτελεί προϋπόθεση απαλλαγής του ιατρού από τυχόν ποινική του ευθύνη. Στο δεύτερο μέρος της εργασίας ακολούθησε η κατηγοριοποίηση των αξιόποινων πράξεων των ιατρών, που σχετίζονται με την δωρεά και μεταμόσχευση οργάνων, σύμφωνα με τον Ποινικό Κώδικα, αλλά και σύμφωνα με τις ειδικές ποινικές διατάξεις του ν. 3984/2011.
description: The aim of the present thesis was the classification of doctor’s criminal liability, who participates in transplant procedure, according to Greek Penal Code in conjunction with the legal rule 3984/2011 for organ transplant and the Code of Medical Ethics. Firstly, we referred to the basic elements and the preconditions of legal transplant, according to the legal rule 3984/2011 and then we mentioned the importance of donor’s and receiver’s informed consent, elements that justify doctor’s malpractice, which is certain in every organ abscission. Then we presented the tipping point of death, when doctors are able to remove organs from a brain dead. In the last chapter we analyzed and categorized doctor’s illegal actions that relate with organ transplant, based in the Greek Penal Code, such as personal injuries and damages that doctors causes to donor and homicide in case that doctor remove organ from a living donor, causing his death, but also in the specific provisions of the legal rule 3984/2011 about organ transplant.
Spin-Bits and N=4 SYM
Creators: name: Marrani, Alessio
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We briefly review the spin-bit formalism, describing the non-planar dynamics of the $\mathcal{N}=4,d=4$ Super Yang-Mills SU(N) gauge theory. After considering its foundations, we apply such a formalism to the $su(2)$ sector of purely scalar operators. In particular, we report an algorithmic formulation of a deplanarizing procedure for local operators in the planar gauge theory, used to obtain planarly-consistent, testable conjectures for the higher-loop $su(2)$ spin-bit Hamiltonians. Finally, we outlook some possible developments and applications.
description: 29 pages; contribution to the Proceedings of the 43rd Erice International School of Subnuclear Physics ``Towards New Milestones in our Quest to go Beyond the Standard Model'', Erice, Italy (29 August--7 September 2005); v2: some references added
Perturbative treatment of three-nucleon force contact terms in three-nucleon Faddeev equations
Creators: name: Witała, H.
name: Golak, J.
name: Skibiński, R.
name: Topolnicki, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a perturbative approach to solving the three-nucleon continuum Faddeev equation. This approach is particularly well suited to dealing with variable strengths of contact terms in a chiral three-nucleon force. We use examples of observables in the elastic nucleon-deuteron scattering as well as in the deuteron breakup reaction to demonstrate high precision of the proposed procedure and its capability to reproduce exact results. A significant reduction of computer time achieved by the perturbative approach in comparison to exact treatment makes this approach valuable for fine-tuning of the three-nucleon Hamiltonian parameters.
description: 13 pages, 4 figures
Minimal pairs, verb tone, extraposition, relative clause periphery
Creators: name: Guebeapo, Léocadie
name: Jarvis, Rebecca
name: Kapner, Julianne
name: Russell, Katherine
name: Goose, Molly
name: Kouadio, Timothée
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: ebr

description: Elicitation of relative-clause extraposition, focus paradigms, and relative-clause edge items.
Tip artifact in atomic force microscopy observations of InAs quantum dots grown in Stranski-Krastanow mode
Creators: name: Shiramine, Ken-ichi
name: Muto, Shunichi
name: Shibayama, Tamaki
name: Sakaguchi, Norihito
name: Ichinose, Hideki
name: Kozaki, Tamotsu
name: Sato, Seichi
name: Nakata, Yoshiaki
name: Yokoyama, Naoki
name: Taniwaki, Masafumi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The tip artifact in atomic force microscopy (AFM) observations of InAs islands was evaluated quantitatively. The islands were grown in the Stranski-Krastanow mode of molecular beam epitaxy. The width and height of the islands were determined using transmission electron microscopy (TEM) and AFM. The average $[\bar{1}10]$ in-plane width and height determined using TEM excluding native oxide were 22 and 7 nm, respectively; those determined using AFM including the oxide were 35 and 8 nm, respectively. The difference in width was due to the oxide and the tip artifact. The sizes including the oxide were deduced from TEM observations to be a width of 27 nm and a height of 6 nm with correction for the thickness of the oxide. The residual difference of 8 nm between the width determined using AFM and that determined using TEM including the oxide was ascribed to the tip artifact. The results enable us to determine the actual size of the islands from their AFM images.
description: 5 pages, 4 figures, 1 table, (C) 2007 American Institute of Physics
First detection of phase-dependent colliding wind X-ray emission outside the Milky Way
Creators: name: Naze, Yael
name: Corcoran, Michael F.
name: Koenisgberger, Gloria
name: Moffat, Anthony F. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: After having reported the detection of X-rays emitted by the peculiar system HD5980, we assess here the origin of this high-energy emission from additional X-ray observations obtained with XMM-Newton. This research provides the first detection of apparently periodic X-ray emission from hot gas produced by the collision of winds in an evolved massive binary outside the Milky Way. It also provides the first X-ray monitoring of a Luminous Blue Variable only years after its eruption and shows that the dominant source of the X-rays is not associated with the ejecta.
description: 13 pages, 3 figures and 1 table, accepted for publication in ApJ (letters)
Externalities and opportunities – impact of new transport & heating solutions on air quality in our cities
Creators: name: Lewenstein, Marcin
Publisher: name: Karlsruhe
Year: 2019

description: As a fund, InnoEnergy aims to simplify and shorten the journey from lab to launch. We focus on developing and investing in innovative and commercially viable products and solutions, and we finance multi-skilled partnerships that significantly reduce the risks of product development. We provide researchers and inventors with access to a deep pool of complementary skills and resources, and connect them to markets and commercial opportunities across Europe. Our collaborative model encourages businesses of all sizes to participate in innovative partnerships, consider new ideas and support new research from across Europe. Recently, we have finalized a broad study into the impact of energy innovation, novel business models and policy enablers on the reduction of smog and other forms of air pollution linked to urban energy consumption. The Clean Air Challenge report has been drafted in response to the European Commission’s recent assertion that smog may account for as many as 1 in every 10 premature deaths in the world, and will cost the EU an astonishing €475 billion per year between 2018 and 2025. That represents 2.9 per cent of average annual GDP. Our study outlines what can be achieved within the air quality domain through boosting the penetration of economically viable, novel technologies and solutions for transportation and heating, indicating that smog reduction through the adoption of innovative solutions could save European citizens €183 billion by 2025. In coming years solutions for tackling air pollution will be one of the key focus points of InnoEnergy investment policy.