cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Maximizing buffer and disk utilizations for news on-demand
Creators: name: Yang, Jinhai
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis, we study the problem of how to maximize the throughput of a multimedia system, given a fixed amount of buffer space and disk bandwidth, both pre-determined at design-time. Our approach is to maximize the utilization of disk and buffers. We propose two methods. First, we analyze a scheme that allows multiple streams to share buffers. Our analysis and simulation results indicate that buffer sharing could lead to as much as a 50% reduction in total buffer requirements. Second, we develop three prefetching strategies: straight forward prefetching (SP), and two types of intelligent prefetchings (IP1 and 1P2). All these strategies try to read a certain amount of data into memory before a query is actually activated. We demonstrate that SP is not effective at all, but both IP1 and 1P2 can maximize the effective use of buffers and disk, leading to as much as a 40% improvement in system throughput. We also extend the two intelligent prefetching schemes to a multiple disk environment.
Towards reduction of type II theories on SU(3) structure manifolds
Creators: name: Kashani-Poor, Amir-Kian
name: Minasian, Ruben
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the reduction of type II supergravity on SU(3) structure manifolds, conjectured to lead to gauged N=2 supergravity in 4 dimensions. The reduction proceeds by expanding the invariant 2- and 3-forms of the SU(3) structure as well as the gauge potentials of the type II theory in the same set of forms, the analogues of harmonic forms in the case of Calabi-Yau reductions. By focussing on the metric sector, we arrive at a list of constraints these expansion forms should satisfy to yield a base point independent reduction. Identifying these constraints is a first step towards a first-principles reduction of type II on SU(3) structure manifolds.
description: 20 pages; v2: condition (2.13old) on expansion forms weakened, replaced by (2.13new), (2.14new)
Grammatical and semantic elicitation: Ditransitives and modality
Creators: name: Ronoh, Chepkemoi
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .pdf file. Elicitation of ditransitives with different combinations of local person objects. Elicitation of modality questionnaire to understand Kipsigis modal inventory.
Braided Hopf algebras obtained from coquasitriangular Hopf algebras
Creators: name: Beattie, Margaret
name: Bulacu, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 16W30

description: Let $(H, σ)$ be a coquasitriangular Hopf algebra, not necessarily finite dimensional. Following methods of Doi and Takeuchi, which parallel the constructions of Radford in the case of finite dimensional quasitriangular Hopf algebras, we define $H_σ$, a sub-Hopf algebra of $H^0$, the finite dual of $H$. Using the generalized quantum double construction and the theory of Hopf algebras with a projection, we associate to $H$ a braided Hopf algebra structure in the category of Yetter-Drinfeld modules over $H_σ^{\rm cop}$. Specializing to $H={\rm SL}_q(N)$, we obtain explicit formulas which endow ${\rm SL}_q(N)$ with a braided Hopf algebra structure within the category of left Yetter-Drinfeld modules over $U_q^{\rm ext}({\rm sl}_N)^{\rm cop}$.
description: 43 pages, 1 figure
Spatial non-locality of electronic correlations beyond GW approximation
Creators: name: Kutepov, Andrey L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The question of spatial locality of electronic correlations beyond GW approximation is one of the central issues of the famous combination of GW and dynamical mean field theory, GW+DMFT. In this work, the above question is addressed directly (for the first time) by performing calculations with and without assumption of locality of the corresponding diagrams. For this purpose we use sc(GW+G3W2) approach where the higher order part (G3W2) is evaluated with fully momentum dependent Green's function G and screened interaction W and with "local" variant, where the single site approximation is assumed for both G and W. For all three materials studied in this work (NiO, $α$-Ce, LiFeAs), we have found the spatial non-locality effects to be strong. For NiO and LiFeAs they, in fact, are decisive for the proper evaluation of vertex corrections. The results of this study have direct impact on our understanding of approximations made in practical implementations of GW+DMFT method, where all diagrams beyond GW (DMFT part) are assumed to be local. Taking into account the fact that the first diagrams beyond GW represent the most important contribution also in GW+DMFT calculations, we conclude that the basic assumption of GW+DMFT, namely the locality of diagrams evaluated in the DMFT part, is not as good as it is believed to be.
description: 21 pages, 15 figures
Η προστασία των δεδομένων υγείας ως ειδική έκφανση της προστασίας προσωπικών δεδομένων, κατ’άρθρον 9Α Σ
Creators: name: Βλάχου, Αγγελίνα Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Δεδομένα υγείας
Προσωπικά δεδομένα
Συνταγματικό Δίκαιο
Health data
Personal data
Constitutional law

description: Αντικείμενο της παρούσης μελέτης αποτελεί η προστασία των δεδομένων υγείας, ως ειδική κατηγορία ευαίσθητων προσωπικών δεδομένων, τα οποία υπάγονται στο πεδίο προστασίας του άρθρου 9Α Σ. Αφού εισαγωγικά γίνεται μία αναφορά στην προστασία των προσωπικών δεδομένων γενικώς, τόσο σε ευρωπαϊκό όσο και σε εθνικό επίπεδο, εξετάζεται η έννοια των δεδομένων υγείας, καθώς και η σύνδεσή της με τις έννοιες της ιατρικής ευθύνης και του ιατρικού απορρήτου. Η εφαρμογή των προστατευτικών διατάξεων του Ν. 2472/1997 καταδεικνύεται μέσω της νομολογίας της Αρχής Προστασίας Δεδομένων Προσωπικού Χαρακτήρα, η οποία κατέχει την αρμοδιότητα διενέργειας του ελέγχου προστασίας βάσει του Συντάγματος. Τέλος, εξετάζεται η προστασία των δεδομένων υγείας με βάση το άρθρο 8 ΕΣΔΑ και μέσω της νομολογίας του ΕΔΔΑ, προκειμένου στο τέλος να εξαχθούν χρήσιμα συμπεράσματα αναφορικά με τα τιθέμενα ζητήματα
description: The aim of the present thesis is the protection of health data, as a specific category of sensitive personal data, per article 9A of the Constitution. After the examination of the general protection of personal data, in European and national level, the subject of study is the content of health data and its connection with medical responsibility and medical confidentiality. Secondly, the case law of the Hellenic Data Protection Authority, which is constitutionally recognized, demonstrates the application of the law in practice (Ν. 2472/1997). At the last part, we examine the protection of health data per ar. 8 of the European Convention on Human Rights and through case law of the European Court of Human Rights, to draw conclusions on this issue
Statistical and Machine Learning Techniques in Adaptive Learning Environments
Creators: name: Χατζησταύρου, Κυριακή Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ασαφής Βαθμολόγηση
Προσαρμοστικότητα
Κανόνες Συσχέτισης
Fuzzy Grading
Adaptability
Association Rules

description: Due to increasing global competition and technology’s constant progress, the usage of online training platforms has grown rapidly. In this thesis, we present statistical & ma-chine learning techniques that can be used in Adaptive Learning Environments. More specifically, we present a grading technique based on fuzzy numbers, which reduces the problem that most platforms face; the lack of a physical evaluator. Moreover, we present an effective way to motivate learners to continuously try and improve their performance by showing them their ranking among the other learners. Interesting rules could be discovered using association rules mining, which could help the learning pro-cedure and the creation of material that reflects the learners’ overall interests or needs
description: Λόγω της παγκοσμιοποίησης και της συνεχόμενης προόδου της τεχνολογίας, η χρήση διαδικτυακών πλατφόρμων εκπαίδευσης έχει αυξηθεί ραγδαία τα τελευταία χρόνια. Σε αυτή την διπλωματική εργασία, παρουσιάζονται στατιστικές τεχνικές και τεχνικές μηχανικής μάθηση, οι οποίες μπορούν να χρησιμοποιηθούν σε εκπαιδευτικά περιβάλλοντα με ικανότητα προσαρμογής. Πιο συγκεκριμένα, παρουσιάζεται μία τεχνική βαθμολόγησης βασισμένη στους ασαφείς αριθμούς, η οποία μειώνει το πρόβλημα που οι περισσότερες διαδικτυακές πλατφόρμες αντιμετωπίζουν: την έλλειψη του ανθρώπινου βαθμολογητή. Επιπροσθέτως, παρουσιάζεται ένας αποτελεσματικός τρόπος να υποκινούνται οι μαθητές με σκοπό την συνεχή προσπάθειά τους και την βελτίωση της επίδοσής τους με το να παρουσιάζεται σε αυτούς η κατάταξή τους μεταξύ των υπόλοιπων μαθητών. Ενδιαφέροντες κανόνες μπορεί να ανακαλυφθούν χρησιμοποιώντας κανόνες συσχέτισης, οι οποίοι μπορούν να βοηθήσουν την εκπαιδευτική διαδικασία και την δημιουργία υλικού που θα ανταποκρίνεται στα ενδιαφέροντα και στις ανάγκες των μαθητών
Topological Order in Gutzwiller Projected Wave Functions for Quantum Antiferromagnets
Creators: name: Li, Tao
name: Yang, Hong-Yu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the topological order in RVB state derived from Gutzwiller projection of BCS-like mean field state. We propose to construct the topological excitation on the projected RVB state through Gutzwiller projection of mean field state with inserted $Z_{2}$ flux tube. We prove that all projected RVB states derived from bipartite effective theories, no matter the gauge structure in the mean field ansatz, are positive definite in the sense of the Marshall sign rule, which provides a universal origin for the absence of topological order in such RVB state.
description: 4 pages, 1 figure
How Technological Progress and Government Programs Influence Agricultural Land Values
Creators: name: Shoemaker, Robbin
name: Shoemaker, Robbin
Publisher: name: Unknown
Year: 1990
Subjects: Agricultural and Food Policy
Land Economics/Use
Research and Development/Tech Change/Emerging Technologies

description: Technological change mitigates the upward pressure on land values caused by growth in population and other factors by increasing the “effective” supply of land. Without technological change during the postwar period, land values would be substantially higher. Government acreage reduction programs, by creating an artificial scarcity of land, have counteracted some of the effects of technological change and placed upward pressure on farmland values.
Modeling of Particle Transport, Neutrals and Radiation in Magnetically-Confined Plasmas with Aurora
Creators: name: Sciortino, F.
name: Odstrčil, T.
name: Cavallaro, A.
name: Smith, S.
name: Meneghini, O.
name: Reksoatmodjo, R.
name: Linder, O.
name: Lore, J. D.
name: Howard, N. T.
name: Marmar, E. S.
name: Mordijck, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Applied Physics (physics.app-ph)
subject: Computational Physics (physics.comp-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We present Aurora, an open-source package for particle transport, neutrals and radiation modeling in magnetic confinement fusion plasmas. Aurora's modern multi-language interface enables simulations of 1.5D impurity transport within high-performance computing frameworks, particularly for the inference of particle transport coefficients. A user-friendly Python library allows simple interaction with atomic rates from the Atomic Data and Atomic Structure database as well as other sources. This enables a range of radiation predictions, both for power balance and spectroscopic analysis. We discuss here the superstaging approximation for complex ions, as a way to group charge states and reduce computational cost, demonstrating its wide applicability within the Aurora forward model and beyond. Aurora also facilitates neutral particle analysis, both from experimental spectroscopic data and other simulation codes. Leveraging Aurora's capabilities to interface SOLPS-ITER results, we demonstrate that charge exchange is unlikely to affect the total radiated power from the ITER core during high performance operation. Finally, we describe the ImpRad module in the OMFIT framework, developed to enable experimental analysis and transport inferences on multiple devices using Aurora.
description: 8 pages + references, 5 figures
Exchange and Correlation in Open Systems of Fluctuating Electron Number
Creators: name: Perdew, John P.
name: Ruzsinszky, Adrienn
name: Csonka, Gábor I.
name: Vydrov, Oleg A.
name: Scuseria, Gustavo E.
name: Staroverov, Viktor N.
name: Tao, Jianmin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: While the exact total energy of a separated open system varies linearly as a function of average electron number between adjacent integers, the energy predicted by semi-local density functional approximations curves upward and the exact-exchange-only or Hartree-Fock energy downward. As a result, semi-local density functionals fail for separated open systems of fluctuating electron number, as in stretched molecular ions A$_2^{+}$ and in solid transition metal oxides. We develop an exact-exchange theory and an exchange-hole sum rule that explain these failures and we propose a way to correct them via a local hybrid functional.
description: 4 pages, 2 figures
Optimizations for model computation based on partial instantiation
Creators: name: Tian, Xiaomei
Publisher: name: University of British Columbia
Year: 2009

description: Various methods have been presented for efficiently evaluating deductive databases and logic programs. It has been shown that mixed integer programming methods can ef fectively support minimal model, stable model and well-founded model semantics for ground deductive databases. However, the “groundness” requirement is a huge draw back because the ground version of a logic program can be very large when compared to the original logic program. A novel approach, called partial instantiation, has been developed recently which, when integrated with mixed integer programming methods, can handle non-ground logic programs. The goal of this thesis is to explore how this integrated framework based on partial instantiation can be optimized. In particular, we have developed an incremental algorithm that minimizes repetitive computations for re ducing the size of a program. We have also developed several optimization techniques to further enhance the efficiency of our incremental algorithm, to further reduce the size of a logic program, and to avoid redundant node expansion in partial instantiation tree. Experimental results have shown that our algorithm and optimization techniques can bring about significant improvement in run-time performance. Last but not least, we have implemented the integrated framework of partial instantiation under UNIX envi ronment.
Conditional entropy retrieval based model in patient-carer scenarios and attitude change potential uses with affective assistant chatbots
Creators: name: Παυλίδου, Μερόπη Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ρομπότ Εξυπηρετητής
Εντροπία
Επικοινωνιακό Ρομπότ
Assistamt Chatbot
Entropy
Social Robot

description: Μελετήθηκε η Μεταφορά Εντροπίας στις Ανθρώπινες συζητήσεις και στη συνέχεια εφαρμόστηκε με τη βοήθεια της βελτιστοποίησης στην παραγωγή λόγου από ένα |Ρομπότ Εξυπηρετητή. Επίσης, εισήχθησαν και φράσεις ανάλογα με τη μοντελοποίηση ανάλυσης συναισθήματος
description: Conditional Entropy algorithm for Communication with Assistant Chatbots was developed. It was tested on Patient Carer Medical Dialogues and the target was to invoke the suitable answer by the robot when the question is given as an input. Furthermore, a vector space for affective communication was proposed
Trapping of 27 bp - 8 kbp DNA and immobilization of thiol-modified DNA using dielectrophoresis
Creators: name: Tuukkanen, Sampo
name: Kuzyk, Anton
name: Toppari, J. Jussi
name: Hakkinen, Hannu
name: Hytonen, Vesa P.
name: Niskanen, Einari
name: Rinkio, Marcus
name: Torma, Paivi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Dielectrophoretic trapping of six different DNA fragments, sizes varying from the 27 to 8416 bp, has been studied using confocal microscopy. The effect of the DNA length and the size of the constriction between nanoscale fingertip electrodes on the trapping efficiency have been investigated. Using finite element method simulations in conjunction with the analysis of the experimental data, the polarizabilities of the different size DNA fragments have been calculated for different frequencies. Also the immobilization of trapped hexanethiol- and DTPA-modified 140 nm long DNA to the end of gold nanoelectrodes was experimentally quantified and the observations were supported by density functional theory calculations.
description: 17 pages (1 column version), 8 figures
Financial Performance of Specialized Corn-Soybean Farms, 1987
Creators: name: Dubman, Robert
name: Hanson, Gregory
name: Dubman, Robert
name: Hanson, Gregory
Publisher: name: Unknown
Year: 1990
Subjects: Agricultural Finance
Crop Production/Industries
Financial Economics
Production Economics

description: Specialized corn-soybean farms—those with at least 50 percent of their production value from corn and soybeans and with at least $40,000 in gross revenue—fared better financially In 1987 than farms specializing in most other types of commodities. Specialized corn-soybean farms accounted for 56 percent of all corn sales and 59 percent of all soybean sales in the United States. Small specialized farms with gross revenue between $40,000 and $100,000 had the least favorable costs and returns structure. Production was concentrated in five adjoining areas: the western Corn Belt, the eastern Corn Belt, the Northern Plains, the Lake States, and the South. Specialized corn-soybean farms in the Northern Plains showed the highest net returns and lowest costs.
Efficient Palm-Line Segmentation with U-Net Context Fusion Module
Creators: name: Van, Toan Pham
name: Nguyen, Son Trung
name: Doan, Linh Bao
name: Tran, Ngoc N.
name: Thanh, Ta Minh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Many cultures around the world believe that palm reading can be used to predict the future life of a person. Palmistry uses features of the hand such as palm lines, hand shape, or fingertip position. However, the research on palm-line detection is still scarce, many of them applied traditional image processing techniques. In most real-world scenarios, images usually are not in well-conditioned, causing these methods to severely under-perform. In this paper, we propose an algorithm to extract principle palm lines from an image of a person's hand. Our method applies deep learning networks (DNNs) to improve performance. Another challenge of this problem is the lack of training data. To deal with this issue, we handcrafted a dataset from scratch. From this dataset, we compare the performance of readily available methods with ours. Furthermore, based on the UNet segmentation neural network architecture and the knowledge of attention mechanism, we propose a highly efficient architecture to detect palm-lines. We proposed the Context Fusion Module to capture the most important context feature, which aims to improve segmentation accuracy. The experimental results show that it outperforms the other methods with the highest F1 Score about 99.42% and mIoU is 0.584 for the same dataset.
description: Published in 2020 International Conference on Advanced Computing and Applications (ACOMP)
Explanation of the RHIC HBT Puzzle by a Granular Source of Quark-Gluon Plasma Droplets
Creators: name: Zhang, Wei-Ning
name: Wong, Cheuk-Yin
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a review on the explanation of the RHIC HBT puzzle by a granular pion-emitting source of quark-gluon plasma droplets. The evolution of the droplet is described by relativistic hydrodynamics with an equation of state suggested by lattice gauge results. The granular source evolution is obtained by superposing all of the evolutions of individual droplets. Pions are assumed to be emitted thermally from the droplets at the freeze-out configuration characterized by a freeze-out temperature $T_f$. We find that the average particle emission time scales with the initial radius of the droplet. Pions will be emitted earlier if the droplet radius is smaller. An earlier emission time will lead to a smaller extracted HBT radius $R_{\rm out}$, while the extracted HBT radius $R_{\rm side}$ is determined by the scale of the distribution of the droplet centers. However, a collective expansion of the droplets can further decrease $R_{\rm out}$. As a result, the value of $R_{\rm out}/R_{\rm side}$ can be close to, or even less than 1 for the
description: 8 pages, 4 figures, invited talk presented at the XI International Workshop on Correlation and Fluctuation in Multiparticle Production, Nov. 21-24, 2006, Hangzhou, China
Spanning trees and Khovanov homology
Creators: name: Champanerkar, Abhijit
name: Kofman, Ilya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Combinatorics (math.CO)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: The Jones polynomial can be expressed in terms of spanning trees of the graph obtained by checkerboard coloring a knot diagram. We show there exists a complex generated by these spanning trees whose homology is the reduced Khovanov homology. The spanning trees provide a filtration on the reduced Khovanov complex and a spectral sequence that converges to its homology. For alternating links, all differentials on the spanning tree complex are zero and the reduced Khovanov homology is determined by the Jones polynomial and signature. We prove some analogous theorems for (unreduced) Khovanov homology.
description: Results in Version 2 have been split among two papers: The current Version 3 and arXiv:0801.4937[math.GT]
The galaxy HI-(sub)halo connection and the HI spatial clustering of local galaxies
Creators: name: Calette, A. R.
name: Rodríguez-Puebla, Aldo
name: Avila-Reese, Vladimir
name: Lagos, Claudia del P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We extend the local stellar galaxy-(sub)halo connection to the atomic hydrogen (HI) component by seeding semi-empirically galaxies into a large N-body dark matter (DM) simulation. The main input to construct the mock galaxy catalogue are: our constrained stellar mass-to-(sub)halo circular velocity ($M_{\ast}$-$V_{\rm DM}$) relation, assuming a scatter independent of any galaxy property, and the empirical $M_{\rm HI}$ conditional probability distributions given $M_{\ast}$ for central and satellite galaxies. We find that the $\langle\log M_{\rm HI}\rangle-\log M_{\rm DM}$ relation is not a monotonic increasing function. It increases with mass up to $M_{\rm DM}\sim 10^{12}$ $M_{\odot}$, attaining a maximum of $\langle\log(M_{\rm HI}/M_{\odot})\rangle \sim 9.2$, and at higher (sub)halo masses, $\langle\log(M_{\rm HI})\rangle$ decreases slightly with $M_{\rm DM}$. The scatter around it is also large and mass dependent. The bivariate $M_{\rm HI}$ and $M_{\rm DM}$ distribution is broad and bimodal, specially at $M_{\rm DM}\gtrsim 10^{12}$ $M_\odot$, which is inherited from the input $M_{\rm HI}$ conditional distributions. We also report the total (central+satellites) HI gas mass within halos, $\langle M^{\rm tot}_{\rm HI}(M_{\rm DM})\rangle$, as a function of $M_{\rm DM}$. The mean $M^{\rm tot}_{\rm HI}-M_{\rm DM}$ relation is an increasing monotonic function. The galaxy spatial clustering increases weakly as the $M_{\rm HI}$ threshold increases. Our HI mock galaxies cluster more in comparison to the blind HI ALFALFA (Arecibo Fast Legacy ALFA) survey but we show that it is mainly due to the selection effects. We discuss the implications of our results in the light of predictions from semi-analytical models and hydrodynamics simulations of galaxy evolution.
description: In press, 20 pages, 19 figures. Some corrections in text, references added. Results unchanged
Fluctuation-Exchange Study of Antiferromagnetism in Electron-Doped Cuprate Superconductors with Disorder
Creators: name: Yan, Xin-Zhong
name: Ting, C. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: On the basis of the Hubbard model, we extend the fluctuation-exchange (FLEX) approach to investigating the properties of antiferromagnetic (AF) phase in electron-doped cuprate superconductors. Furthermore, by incorporating the effect of scatterings due to the disordered dopant-atoms into the FLEX formalism, our numerical results show that the antiferromagnetic transition temperature, the onset temperature of pseudogap due to spin fluctuations, the spectral density of the single particle near the Fermi surface, and the staggered magnetization in the AF phase as a function of electron doping can consistently account for the experimental measurements.
description: 4 pages, 5 figures
Dynamical model of an obscuring clumpy torus in AGNs: I. Velocity and velocity dispersion maps for interpretation of ALMA observations
Creators: name: Bannikova, E. Yu.
name: Sergeyev, A. V.
name: Akerman, N. A.
name: Berczik, P. P.
name: Ishchenko, M. V.
name: Capaccioli, M.
name: Akhmetov, V. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have developed the dynamical model of a clumpy torus in an active galactic nucleus (AGN) and compared to recent ALMA observations. We present $N$-body simulations of a torus in the field of a supermassive black hole (SMBH), made of up to $N=10^5$ gravitationally interacting clouds. As initial conditions, we choose random distributions of the orbital elements of the clouds with a cut-off in the inclination to mimic the presence of wind cones produced at the early AGN stage. When the torus reaches an equilibrium, it has a doughnut shape. We discuss the presence of box orbits. We have then constructed the velocity and velocity dispersion maps using the resulting distributions of the clouds at equilibrium. The effects of torus inclination and cloud sizes are duly analyzed. We discuss the obscuration effects of the clouds using a ray tracing simulation matching the model maps to ALMA resolution. By comparing the model with the observational maps of NGC 1068 we find that the SMBH mass is $M_\text{smbh}=5\times 10^6 M_\odot$ for the range of the torus inclination angles $45^\circ - 60^\circ$. We also construct the velocity dispersion maps for NGC 1326 and NGC 1672. They show that the peaks in the ALMA dispersion maps are related to the emission of the torus throat. Finally, we obtain the temperature distribution maps with parameters that correspond to our model velocity maps for NGC 1068. They show stratification in temperature distribution with the shape of the high temperature region as in the VLTI/MIDI map.
description: 16 pages, 19 figures, 1 table, accepted for publication in MNRAS
Το νομικό πλαίσιο της μεταλλευτικής δραστηριότητας στην Ελλάδα
Creators: name: Μαντζάρη, Μαριάνα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Νομικό πλαίσιο
Μεταλλευτική δραστηριότητα-Ελλάδα
Legal framework
Mining activity-Greece

description: Σκοπός αυτής της διατριβής είναι η πλήρης καταγραφή και κατανόηση του ισχύοντος νομικού πλαισίου που διέπει τη μεταλλευτική δραστηριότητα στην Ελλάδα. Συγκεκριμένα, παρουσιάστηκαν αναλυτικά τα στάδια που διέπουν την αδειοδότηση και την άσκηση της μεταλλευτικής δραστηριότητας. Ακόμη, έγινε αναφορά στα στατιστικά δεδομένα της συγκεκριμένης δραστηριότητας στην Ελλάδα για τα έτη 2013-2014 σύμφωνα με την Έκθεση του Υπουργείου. Επίσης, στην παρούσα διατριβή περιγράφησαν οι σχετικές με τη μεταλλευτική δραστηριότητα αρμοδιότητες, όπως οριοθετούνται από το Ν.Δ.210/1973, ως ισχύει. Απαραίτητη κρίνεται η αποσαφήνιση σημαντικών ορισμών που δημιουργούν εννοιολογική σύγχυση και εξ αυτού έγιναν οι απαραίτητες διευκρινήσεις, ώστε αυτή να αρθεί κατά το δυνατόν. Τέλος, διαπιστώθηκε η ανάγκη επικαιροποίησης και κωδικοποίησης των ανωτέρω διατάξεων, έτσι ώστε να ανταποκρίνονται στις επιταγές της σύγχρονης εκμετάλλευσης των μεταλλευτικών ορυκτών συνδράμοντας ουσιαστικά στην οικονομική ανάπτυξη της χώρας
description: The aim of the present thesis is to record the current Legal framework of mining activity in Greece. Specifically, the stages of the authorization and exploitation of minerals have been presented in detail. Furthermore, there is reference to statistical data of this activity in Greece. Additionally, the respective competencies of the authorities have been described, as delineated. Another important issue is the confusion about the real content of some crucial definitions of the Mining Code. For this reason the necessary clarification has been given. Finally, the need for consolidation and codification of the above provisions has been noted in order for this activity to meet the requirements of modern exploitation of minerals, contributing substantially to the Economic Development of Greece
Single-Event Handbury-Brown-Twiss Interferometry
Creators: name: Wong, Cheuk-Yin
name: Zhang, Wei-Ning
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Large spatial density fluctuations in high-energy heavy-ion collisions can come from many sources: initial transverse density fluctuations, non-central collisions, phase transitions, surface tension, and fragmentations. The common presence of some of these sources in high-energy heavy-ion collisions suggests that large scale density fluctuations may often occur. The detection of large density fluctuations by single-event Hanbury-Brown-Twiss interferometry in heavy-ion collisions will provide useful information on density fluctuations and the dynamics of heavy-ion collisions.
description: 8 pages, 4 figures, invited talk presented at the XI International Workshop on Correlation and Fluctuation in Multiparticle Production, Nov. 21-24, 2006, Hangzhou, China
Quantitative Evaluation of Crack Depths on Thin Aluminum Plate using Eddy Current Pulse-Compression Thermography
Creators: name: Yi, Qiuji
name: Malekmohammadi, Hamed
name: Tian, Gui Yun
name: Laureti, Stefano
name: Ricci, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Eddy current stimulated thermography is an emerging technique for non-destructive testing and evaluation of conductive materials. However, quantitative estimation of the depth of subsurface defects in metallic materials by thermography techniques remains challenging due to significant lateral thermal diffusion. This work presents the application of eddy current pulse compression thermography to detect surface and subsurface defects with various depths in an aluminum sample. Kernel Principal Component analysis and Low Rank Sparse modelling were used to enhance the defective area, and cross point feature was exploited to quantitatively evaluate the defects depth. Based on experimental results, it is shown that the crossing point feature has a monotonic relationship with surface and subsurface defects depth, and it can also indicate whether the defect is within or beyond the eddy current skin depth. In addition, the comparison study between aluminum and composites in terms of impulse response and proposed features are also presented.
A pitfall in the use of extended likelihood for fitting fractions of pure samples in mixed samples
Creators: name: Nappi, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The paper elucidates, with an analytic example, a subtle mistake in the application of the extended likelihood method to the problem of determining the fractions of pure samples in a mixed sample from the shape of the distribution of a random variable. This mistake, which affects two widely used software packages, leads to a misestimate of the errors.
description: 10 pages with 1 figure, to appear in Computer Physics Communications. New version including major changes and additions, resulting from discussion with journal reviewers
How to control pairing fluctuations: SU(2) slave-rotor gauge theory of the Hubbard model
Creators: name: Kim, Ki-Seok
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study how to incorporate Mott physics in the BCS-type superconductor, motivated from the fact that high $T_c$ superconductivity results from a Mott insulator via hole doping. The U(1) slave-rotor representation was proposed to take local density fluctuations into account non-perturbatively, describing the Mott-Hubbard transition at half filling. Since this decomposition cannot control local pairing fluctuations, the U(1) slave-rotor representation does not give a satisfactory treatment for charge fluctuations. Extending the U(1) slave-rotor representation, we introduce an SU(2) slave-rotor representation to allow not only local density fluctuations but also local pairing excitations. We find an SU(2) slave-rotor gauge theory of the Hubbard model in terms of two kinds of collective boson excitations associated with density and pairing fluctuations that interact with gapless fermion excitations via SU(2) gauge fluctuations. An interesting observation in this effective description is that phase fluctuations of fermion pairs arise as SU(2) gauge fluctuations. Thus, fermion-pairing excitations can be controlled by dynamics of collective bosons in the SU(2) slave-rotor gauge theory. Performing the standard saddle-point analysis based on the SU(2) slave-rotor action, we find ......
Changes in U.S. Agriculture and Emerging Issues for Legislation in the 1990's
Creators: name: Lipton, Kathryn L.
name: Lipton, Kathryn L.
Publisher: name: Unknown
Year: 1989
Subjects: Agricultural and Food Policy

description: Policymakers debating the 1990 farm legislation face a number of important domestic issues. Annual costs of Federal farm programs could remain high, despite moves toward more market-oriented policies in the 1985 legislation. The goal of a more market-responsive farm sector will likely be reflected in provisions to increase program flexibility and ameliorate program inequities. A number of issues beyond traditional commodity policy could be addressed, including food safety and alternative agriculture.
Influence of the crust on the neutron star macrophysical quantities and universal relations
Creators: name: Suleiman, Lami
name: Fortin, Morgane
name: Zdunik, Julian Leszek
name: Haensel, Pawel
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Measurements of neutron-star macrophysical properties thanks to multimessenger observations offer the possibility to constrain the properties of nuclear matter. Indeed cold and dense matter as found inside neutron stars, in particular in their core, is not accessible to terrestrial laboratories.We investigate the consequences of using equations of state that employ models for the core and the crust that are not calculated consistently on the neutron-star macrophysical properties, on some of the so-called universal relations and on the constraints obtained from gravitational-wave observations. We use various treatments found in the literature to connect together nonconsistent core and crust equations of state. We then compute the mass, the radius, the tidal deformability, and the moment of inertia for each model. Finally, we assess the discrepancies in the neutron-star macrophysical properties obtained when consistent models for the whole star and nonconsistent ones are employed. The use of crust models nonconsistent with the core introduces an error on the macrophysical parameters which can be as large as the estimated accuracy of current and next generation telescopes. The precision of some of the universal relations reported in the literature is found to be overestimated. We confirm that the equation of the crust has limited influence on the macrophysical properties. The discrepancy between results obtained for a fully consistent equation of state and a nonconsistent one can be reduced if one connects the core and the crust models at baryon densities around 0.08-0.1 fm$^{-3}$. The equation of the crust cannot be probed with current multimessenger observations and near-future ones.
description: 19 pages, 12 figures, 3 tables. Accepted for publication in PRC
Particle-wall collision statistics in the open circular billiard
Creators: name: Stilck, J. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In the open circular billiard particles are placed initially with a uniform distribution in their positions inside a planar circular vesicle. They all have velocities of the same magnitude, whose initial directions are also uniformly distributed. No particle-particle interactions are included, only specular elastic collisions of the particles with the wall of the vesicle. The particles may escape through an aperture with an angle $2δ$. The collisions of the particles with the wall are characterized by the angular position and the angle of incidence. We study the evolution of the system considering the probability distributions of these variables at successive times $n$ the particle reaches the border of the vesicle. These distributions are calculated analytically and measured in numerical simulations. For finite apertures $δπ/2$ a solution is found for arbitrary $n$. The escape probability as a function of $n^{-1}$ decays with an exponent 4 for $δ>π/2$ and evidences for a power law decay are found for lower apertures as well.
description: 11 pages, 14 figures. Typos corrected and two new figures added, figure captions changed and additional discussions added. Version accepted for publication in Physica A
Το αδίκημα της κακόβουλης βλασφημίας
Creators: name: Βαρβέρη, Αναστασία Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Βλασφημία
Θρησκευτική ελευθερία
Ποινικός Κώδικας
Blasphemy
Freedom of religion
Criminal Law

description: Σκοπός της παρούσας εργασίας υπήρξε η μελέτη του άρθρου 198 Π.Κ. περί κακόβουλης βλασφημίας. Εξετάσαμε επιμέρους τις έννοιες της αντικειμενικής υπόστασης του ως άνω εγκλήματος, όπως το προστατευόμενο έννομο αγαθό και ασχοληθήκαμε με τα ζητήματα της υποκειμενικής υπόστασης, της απόπειρας, της συμμετοχής, καθώς και με τη συρροή. Στη συνέχεια, εξετάσαμε τα επιχειρήματα που έχουν διατυπωθεί από τη θεωρία τόσο υπέρ όσο και κατά της τυποποίησης των θρησκευτικών αδικημάτων στην ελληνική έννομη τάξη. Mέσα από τη νομολογία των εθνικών δικαστηρίων αλλά και του ΕΔΔΑ, μελετήσαμε τις περιπτώσεις σύγκρουσης της θρησκευτικής ελευθερίας με την ελευθερία της τέχνης και του λόγου, καταλήγοντας στους θεμιτούς περιορισμούς των ελευθεριών. Στο τέλος, εντοπίσαμε το ρόλο και τους λόγους που η ποινικοποίηση της βλασφημίας πρέπει να έχει θέση στη σύγχρονη νομοθεσία
description: The aim of the present thesis was the study of the article 198 Penal Code on malicious blasphemy. We examined individual features of the actusreus of this criminal offence, such as the legally protected right and we also examined other matters, such as the mensrea, the attempted false notification, and the afflux with other criminal offences. Moreover, we examined the arguments made by the theory both for and against the religious offenses in Greek law, and we will search the protection scope of those provisions. Through the jurisprudence of national courts and the EctHR we also studied the conflicts between the freedom of religion with the freedoms of art and speech, resulting in the legal restrictions of the two freedoms.Finally, we spotted the role and the reasons under which the criminalization of blasphemy should have its place today in a modern liberal criminal law
Interpreting the Latent Space of Generative Adversarial Networks using Supervised Learning
Creators: name: Van, Toan Pham
name: Nguyen, Tam Minh
name: Tran, Ngoc N.
name: Nguyen, Hoai Viet
name: Doan, Linh Bao
name: Dao, Huy Quang
name: Minh, Thanh Ta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: With great progress in the development of Generative Adversarial Networks (GANs), in recent years, the quest for insights in understanding and manipulating the latent space of GAN has gained more and more attention due to its wide range of applications. While most of the researches on this task have focused on unsupervised learning method, which induces difficulties in training and limitation in results, our work approaches another direction, encoding human's prior knowledge to discover more about the hidden space of GAN. With this supervised manner, we produce promising results, demonstrated by accurate manipulation of generated images. Even though our model is more suitable for task-specific problems, we hope that its ease in implementation, preciseness, robustness, and the allowance of richer set of properties (compared to other approaches) for image manipulation can enhance the result of many current applications.
description: Published in 2020 International Conference on Advanced Computing and Applications (ACOMP)
Spin qubits in graphene quantum dots
Creators: name: Trauzettel, B.
name: Bulaev, Denis V.
name: Loss, Daniel
name: Burkard, Guido
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose how to form spin qubits in graphene. A crucial requirement to achieve this goal is to find quantum dot states where the usual valley degeneracy in bulk graphene is lifted. We show that this problem can be avoided in quantum dots based on ribbons of graphene with semiconducting armchair boundaries. For such a setup, we find the energies and the exact wave functions of bound states, which are required for localized qubits. Additionally, we show that spin qubits in graphene can not only be coupled between nearest neighbor quantum dots via Heisenberg exchange interaction but also over long distances. This remarkable feature is a direct consequence of the quasi-relativistic spectrum of graphene.
description: 10 pages, 9 figures
Multicomponent fluid of hard spheres near a wall
Creators: name: Malijevsky, Alexandr
name: Yuste, Santos B.
name: Santos, Andres
name: de Haro, Mariano Lopez
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The rational function approximation method, density functional theory, and NVT Monte Carlo simulation are used to obtain the density profiles of multicomponent hard-sphere mixtures near a planar hard wall. Binary mixtures with a size ratio 1:3 in which both components occupy a similar volume are specifically examined. The results indicate that the present version of density functional theory yields an excellent overall performance. A reasonably accurate behavior of the rational function approximation method is also observed, except in the vicinity of the first minimum, where it may even predict unphysical negative values.
description: 10 pages, 5 figures; v2: minor changes; Fig. 5 is new; to be published in PRE
Topology building and random polygon generation
Creators: name: Zhu, Chongjian
Publisher: name: University of British Columbia
Year: 2009

description: In the island adoption problem from geographical information system we are asked to identify which islands are located in which lakes. This problem translates directly to polygon nesting in computational geometry: given a set of polygons, find their nesting structure. We present our research into a broader nesting problem, namely connected component nesting, beginning with the underlying concept of topology-building and a related issue of random polygon generation. Topology building is a process of structuring data. We develop a plane sweep al gorithm for building a quad-edge data structure that captures the topological structure of connected components of a set of line segments. The algorithm starts with a data structure representing a single edge then adds edges into the data structure at each step while sweeping across the connected components The algorithm’s time complexity is determined by the time to sort the vertices of the line segments. We develop two approaches for obtaining the nesting structure of polygons. The first adopts a basic idea of Bajaj and Dey [1], but introduces a new notch definition to simplify their algorithm. The second generalizes the nesting problem to a broader class including the nesting of connected components. We present a sweep algorithm, based on a union-find data structure, that computes the nesting of the connected components. In order to test and verify the time complexity of our polygon nesting algorithm, we present an algorithm that generates x-monotone polygons uniformly at random over a vertex set of n points. This algorithm scans the point set to calculate the total number of monotone polygons that can be created, then reverses the scan to generate a random monotone polygon. This process generates a random polygon over the n vertices in 0(K) time, where n K n2 is the number edges of the visibility graph of the x-monotone chain whose vertices are the given n points. The space complexity of our algorithm is 0(n).