cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Measuring Space-Time Geometry over the Ages
Creators: name: Stebbins, Albert
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Theorists are often told to express things in the "observational plane". One can do this for space-time geometry, considering "visual" observations of matter in our universe by a single observer over time, with no assumptions about isometries, initial conditions, nor any particular relation between matter and geometry, such as Einstein's equations. Using observables as coordinates naturally leads to a parametrization of space-time geometry in terms of other observables, which in turn prescribes an observational program to measure the geometry. Under the assumption of vorticity-free matter flow we describe this observational program, which includes measurements of gravitational lensing, proper motion, and redshift drift. Only 15% of the curvature information can be extracted without long time baseline observations, and this increases to 35% with observations that will take decades. The rest would likely require centuries of observations. The formalism developed is exact, non-perturbative, and more general than the usual cosmological analysis.
description: Originally written for the Gravity Research Foundation 2012 Awards for Essays on Gravitation and received Honorable Mention
Selectivity estimation of approximate predicates on text
Creators: name: Lee, Hongrae
Publisher: name: University of British Columbia
Year: 2010

description: This dissertation studies selectivity estimation of approximate predicates on text. Intuitively, we aim to count the number of strings that are similar to a given query string. This type of problem is crucial in handling text in RDBMSs in an error-tolerant way. A common difficulty in handling textual data is that they may contain typographical errors, or use similar but different textual representations for the same real-world entity. To handle such data in databases, approximate text processing has gained extensive interest and commercial databases have begun to incorporate such functionalities. One of the key components in successful integration of approximate text processing in RDBMSs is the selectivity estimation module, which is central in optimizing queries involving such predicates. However, these developments are relatively new and ad-hoc approaches, e.g., using a constant, have been employed. This dissertation studies reliable selectivity estimation techniques for approximate predicates on text. Among many possible predicates, we focus on two types of predicates which are fundamental building blocks of SQL queries: selections and joins. We study two different semantics for each type of operator. We propose a set of related summary structures and algorithms to estimate selectivity of selection and join operators with approximate matching. A common challenge is that there can be a huge number of variants to consider. The proposed data structures enable efficient counting by considering a group of similar variants together rather than each and every one separately. A lattice-based framework is proposed to consider overlapping counts among the groups. We performed extensive evaluation of proposed techniques using real-world and synthetic data sets. Our techniques support popular similarity measures including edit distance, Jaccard similarity and cosine similarity and show how to extend the techniques to other measures. Proposed solutions are compared with state-of-the-arts and baseline methods. Experimental results show that the proposed techniques are able to deliver accurate estimates with small space overhead.
GCN-WP -- Semi-Supervised Graph Convolutional Networks for Win Prediction in Esports
Creators: name: Bisberg, Alexander J.
name: Ferrara, Emilio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Win prediction is crucial to understanding skill modeling, teamwork and matchmaking in esports. In this paper we propose GCN-WP, a semi-supervised win prediction model for esports based on graph convolutional networks. This model learns the structure of an esports league over the course of a season (1 year) and makes predictions on another similar league. This model integrates over 30 features about the match and players and employs graph convolution to classify games based on their neighborhood. Our model achieves state-of-the-art prediction accuracy when compared to machine learning or skill rating models for LoL. The framework is generalizable so it can easily be extended to other multiplayer online games.
Transverse instability of dunes
Creators: name: Parteli, Eric J. R.
name: Andrade, José S.
name: Herrmann, Hans J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The simplest type of dune is the transverse one, which propagates with invariant profile orthogonally to a fixed wind direction. Here we show numerically and with a linear stability analysis that transverse dunes are unstable with respect to along-axis perturbations in their profile and decay on the bedrock into barchan dunes. Any forcing modulation amplifies exponentially with growth rate determined by the dune turnover time. We estimate the distance covered by a transverse dune before fully decaying into barchans and identify the patterns produced by different types of perturbation.
description: 4 pages, 3 figures; To appear in Physical Review Letters
Fluctuation Probes of Early-Time Correlations in Nuclear Collisions
Creators: name: Gavin, Sean
name: Moschelli, George
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Correlation measurements imply that anisotropic flow in nuclear collisions includes a novel triangular component along with the more familiar elliptic-flow contribution. Triangular flow has been attributed to event-wise fluctuations in the initial shape of the collision volume. We ask two questions: 1) How do these shape fluctuations impact other event-by-event observables? 2) Can we disentangle fundamental information on the early time fluctuations from the complex flow that results? We study correlation and fluctuation observables in a framework in which flux tubes in an early Glasma stage later produce hydrodynamic flow. Calculated multiplicity and transverse momentum fluctuations are in excellent agreement with data from 62.4 GeV Au+Au up to 2.76 TeV Pb+Pb.
description: 1 Figure and references added. Results unchanged
Structure of the Porcupine Creek anticlinorium and tectonic implications of the lower cambrian Gog Group of the Rocky Mountain main ranges
Creators: name: Lickorish, William Henry
Publisher: name: University of Calgary
Year: 1992
Subjects: subject: QE 601 L52 1992a
subject: Geology, Structural - British Columbia
subject: Formations (Geology) - British Columbia
subject: Gog Group (B.C.)
subject: British Columbia - Cog Group - Geology

description: Bibliography: p. 147-158.
description: Archive Copy: offsite
Slowly rotating and the accelerating $α'$-corrected black holes in four and higher dimensions
Creators: name: Agurto-Sepúlveda, Felipe
name: Chernicoff, Mariano
name: Giribet, Gaston
name: Oliva, Julio
name: Oyarzo, Marcelo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the low-energy effective action of string theory at order $α'$, including $R^2$-corrections to the Einstein-Hilbert gravitational action and non-trivial dilaton coupling. By means of a convenient field redefinition, we manage to express the theory in a frame that enables us to solve its field equations analytically and perturbatively in $α' $ for a static spherically symmetric ansatz in an arbitrary number of dimensions. The set of solutions we obtain is compatible with asymptotically flat geometries exhibiting a regular event horizon at which the dilaton is well-behaved. For the 4-dimensional case, we also derive the stationary black hole configuration at first order in $α'$ and in the slowly rotating approximation. This yields string theory modifications to the Kerr geometry, including terms of the form $a$, $a^2$, $α'$ and $aα'$. In addition, we obtain the first $α'$ correction to the C-metrics, which accommodates accelerating black holes. We work in the string frame and discuss the connection to the Einstein frame, for which rotating black holes have already been obtained in the literature.
description: 19 pages, no figures. v2 21 pages, rotating solution added and title modified, one author added. v3 26 pages, accelerating solution added and title accordingly modified. We have also included the explicit mapping to the Einstein frame that allows to relate our solutions with the ones appearing in previous literature. To appear in PRD
EVOKS - Benutzerfreundliche Erstellung kontrollierter Vokabulare für die Geisteswissenschaften
Creators: name: Ernst, Felix
name: Frank, Laura
name: Götzelmann, Germaine
name: Eckhardt, Klara
name: Maly, Jan
name: Preker, Yannis
name: Scholz, Jonas
name: Helling, Patrick
name: Gietz, Peter
name: Derntl, Michael
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2023
Subjects: FORGE2023
Kontrollierte Vokabulare
Wissensgraphen
Vokabulareditor
SKOS

description: EVOKS ist ein Werkzeug zur benutzerfreundlichen, kollaborativen Erstellung, Bearbeitung und Veröffentlichung von Wissensgraphen im SKOS-Format durch Fachwissenschaftler:innen ohne tiefe Vorkenntnisse in Ontologieentwicklung. Bei der Entwicklung wurden die FAIR-Prinzipien beachtet. Hieraus folgt die Verwendung von standardisierten Schnittstellen, Datenmodellen und Protokollen sowie Persistenz durch feste IDs und eine Versionierung. Durch eine Nutzer:innen- und Gruppenverwaltung wird ein einfacher Reviewprozess ermöglicht sowie die Urheberschaft aller erstellen Inhalte sichergestellt. EVOKS wird bereits in verschiedenen, größtenteils geisteswissenschaftlichen Forschungsprojekten genutzt bzw. erprobt. Daher ist das Ziel des Posters, EVOKS der Forschungsgemeinschaft vorzustellen und wertvolles Feedback zu erhalten, um die Software weiterzuentwickeln.
Characterisation of microbial communities degrading C5+ hydrocarbons
Creators: name: Kay, Jason G.
Publisher: name: University of Calgary
Year: 2000
Subjects: subject: QR111 .K39 2000
subject: Soils - Effect of hydrocarbons on
subject: Microbial ecology
subject: Hydrocarbons - Biodegradation
subject: Soil microbiology
subject: Soil remediation

description: Biliography: p.120-128.
Evolution from localized to intermediate valence regime in Ce2Cu2-xNixIn
Creators: name: Pikul, A. P.
name: Kaczorowski, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Polycrystalline samples of the solid solution Ce2Cu2-xNixIn were studied by means of x-ray powder diffraction, magnetic susceptibility and electrical resistivity measurements performed in a wide temperature range. Partial substitution of copper atoms by nickel atoms results in quasi-linear decrease of the lattice parameters and the unit cell volume of the system. The lattice compression leads to an increase in the exchange integral and yields a reversal in the order of the magnetic 4f1 and nonmagnetic 4f0 states, being in line with the Doniach phase diagram. In the localized regime, where an interplay of the Kondo scattering and the crystalline electric field effect takes place, the rise in the hybridization strength is accompanied with relative reduction in the scattering conduction electrons on excited crystal field levels. (c) 2011 IOP Publishing Ltd.
description: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher-authenticated version is available online at doi:10.1088/0953-8984/23/45/456002
Dynamical backaction effects between localised spins and electronic conductors
Creators: name: Matern, Stephanie
Publisher: name: University of St Andrews
Year: 2020
Subjects: Dynamical behaviour of condensed matter systems
Non-Markovian dynamics in open quantum systems

description: In this thesis we present an investigation of the influence of quantum correlations on a quantum system’s dynamical behaviour. Our focus is specifically on the time dependence of quantum spins in an environment of itinerant electrons. This is an archetype for strong correlation physics, whose dynamical onset is the central correlation effect investigated in this work. We derive an analytic result for the time evolution of a single localised quantum spin in weak contact with conduction electrons. This result is obtained from a detailed analysis of the pole structure of the Nakajima-Zwanzig equation for the reduced density matrix in Laplace space. We provide a description of the full time range, from very short times in which a novel result for non-Markovian behaviour is obtained, to long times in which we recover the well-known exponential decay expressions. For the short times we show how the non-Markovian memory effects of the spin’s dynamics arise from the backaction of coherent electronic particle-hole fluctuations. As an application of the fast dynamics we propose a cooling protocol going beyond the paradigm of thermodynamic cycles. The protocol relies on a rapid pump scheme with a repeated reinitialisation of the fast quantum coherent dynamics, with each repetition carrying away a small amount of heat from the electronic environment. This protocol is temperature independent and designed to circumvent a natural bottleneck in standard demagnetisation cooling due to long relaxation times at low temperatures. Finally we extend the dynamics to a pair of localised spins coupled through the same electronic environment, using a self-consistent projection operator framework. In contrast to the conventional RKKY coupling we derive a set of coupled equations including the temporal and spatial correlations. This set becomes finite through a meticulous identification of the electronic fluctuations responsible for the coupled dynamics, allowing for a numerical solution.
Quantum critical dynamics in a 5000-qubit programmable spin glass
Creators: name: King, Andrew D.
name: Raymond, Jack
name: Lanting, Trevor
name: Harris, Richard
name: Zucca, Alex
name: Altomare, Fabio
name: Berkley, Andrew J.
name: Boothby, Kelly
name: Ejtemaee, Sara
name: Enderud, Colin
name: Hoskinson, Emile
name: Huang, Shuiyuan
name: Ladizinsky, Eric
name: MacDonald, Allison J. R.
name: Marsden, Gaelen
name: Molavi, Reza
name: Oh, Travis
name: Poulin-Lamarre, Gabriel
name: Reis, Mauricio
name: Rich, Chris
name: Sato, Yuki
name: Tsai, Nicholas
name: Volkmann, Mark
name: Whittaker, Jed D.
name: Yao, Jason
name: Sandvik, Anders W.
name: Amin, Mohammad H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Experiments on disordered alloys suggest that spin glasses can be brought into low-energy states faster by annealing quantum fluctuations than by conventional thermal annealing. Due to the importance of spin glasses as a paradigmatic computational testbed, reproducing this phenomenon in a programmable system has remained a central challenge in quantum optimization. Here we achieve this goal by realizing quantum critical spin-glass dynamics on thousands of qubits with a superconducting quantum annealer. We first demonstrate quantitative agreement between quantum annealing and time-evolution of the Schrödinger equation in small spin glasses. We then measure dynamics in 3D spin glasses on thousands of qubits, where simulation of many-body quantum dynamics is intractable. We extract critical exponents that clearly distinguish quantum annealing from the slower stochastic dynamics of analogous Monte Carlo algorithms, providing both theoretical and experimental support for a scaling advantage in reducing energy as a function of annealing time.
Recreational carrying capacities: a review and an application in an intensively used recreational area
Creators: name: Dyson, Ian Witton
Publisher: name: Arts
Year: 1980
Subjects: subject: GV 191.66 D96 1980 Fiche
subject: Outdoor recreation - Environmental aspects
subject: Outdoor recreation - Management
subject: Ecology
subject: FOS: Biological sciences
subject: Recreation - Alberta
subject: Recreational surveys - Alberta

description: Bibliography: p. 326-350.
description: Two distinct research topics are dealt with in this thesis. The first is a review of literature pertaining to the study of recreational carrying capacities. The key determinants of management, user, and ecological conditions are detailed and a number of more general perspec­tives and ramifications are discussed. Material concerning water-oriented recreational resources is reviewed separately to emphasize special considerations arising from the nature of the medium. The second research topic involves a study of the characteristics of recreationists at an intensively used water-oriented recreational resource in central Alberta. A randomly distributed questionnaire schedule elicited information about users' socio-economic characteristics and attitudes and perceptions of a broad range of subjects and conditions. Data from the 257 usable returned questionnaires (response rate, 54%) are analysed by means of frequency counts; chi-square tests are used to ascertain the existence of relationships between selected variables; and in one instance a cluster analysis is used to identify similar attitudinal response groupings toward a number of specified recreational activities. Results showed that while visitors to the intensively used recreational resource differed substantially from the well documented characteristics of users of wilderness environments according to various indices, numerous findings complemented the results of several studies conducted in widely disparate kinds of areas. It is contended that it is imperative for managers of all recreational resources to address the carrying capacity concept, as despite the fact that it is not operational, valuable information of direct utility in planning and management decision making is obtainable; that this information can provide a far superior foundation upon which to make decisions that are democratic, justifiable, and capable of withstanding scrutiny than measures which are commonly employed at present; and that the concept is as applicable to intensively used recreational resources as it is to wilderness environments.
Mitigating the source-side channel vulnerability by characterization of photon statistics
Creators: name: Sharma, Tanya
name: Biswas, Ayan
name: Ramakrishnan, Jayanth
name: Chandravanshi, Pooja
name: Singh, Ravindra P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum key distribution (QKD) theoretically offers unconditional security. Unfortunately, the gap between theory and practice threatens side-channel attacks on practical QKD systems. Many well-known QKD protocols use weak coherent laser pulses to encode the quantum information. These sources differ from ideal single photon sources and follow Poisson statistics. Many protocols, such as decoy state and coincidence detection protocols, rely on monitoring the photon statistics to detect any information leakage. The accurate measurement and characterization of photon statistics enable the detection of adversarial attacks and the estimation of secure key rates, strengthening the overall security of the QKD system. We have rigorously characterized our source to estimate the mean photon number employing multiple detectors for comparison against measurements made with a single detector. Furthermore, we have also studied intensity fluctuations to help identify and mitigate any potential information leakage due to state preparation flaws. We aim to bridge the gap between theory and practice to achieve information-theoretic security.
description: Comments and suggestions are welcomed
Array Antenna Power Pattern Analysis Through Quantum Computing
Creators: name: Tosi, Luca
name: Rocca, Paolo
name: Anselmi, Nicola
name: Massa, Andrea
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A method for the analysis of the power pattern of phased array antennas (PAs) based on the quantum Fourier transform (QFT) is proposed. The computation of the power pattern given the set of complex excitations of the PA elements is addressed within the quantum computing (QC) framework by means of a customized procedure that exploits the quantum mechanics principles and theory. A representative set of numerical results, yielded with a quantum computer emulator, is reported and discussed to assess the reliability of the proposed method by pointing out its features in comparison with the classical approach based on the discrete Fourier transform (DFT), as well.
description: 35 pages, 12 figures
The Impact of off-highway recreation vehicles on big game: management implications for Alberta's eastern slopes
Creators: name: Yarmoloy, Cornel P. (Cornel Peter), 1957-
Publisher: name: Environmental Design
Year: 1983
Subjects: subject: QH 545 A43 Y35 1986
subject: All terrain vehicles - Environmental aspects
subject: Environmental policy - Alberta - Eastern slopes
subject: Wildlife management - Alberta - Eastern slopes

description: Bibliography: p. 55-67.
description: This study investigated the impact of off-highway recreational vehicle use on habitat utilization and reproduction of big game animals. Informa­tion gathered was applied to off-highway vehicle management on Alberta's Eastern Slopes. The literature showed various detrimental effects of recreational vehicle use on wildlife including; avoidance of habitat adjacent to road­ways, overharvesting of big game populations and movements of animals into marginal habitat. There was a general lack of information on the direct impact on recreational vehicle use on behavior and reproduction of big game animals. To supplement this information, female mule deer were subjected to experimental vehicle harassment. Experimental work was performed on Suffield Military Reserve in south-eastern Alberta. Three radio-collared female mule deer were harassed by pursuit with a Honda three-wheeled all-terrain-cycle during Oct.1-Oct.24, 1981. The study showed harassed deer shifted to nocturnal feeding patterns, increased their use of hiding cover, increased their home range size, and fled from the harassing vehicle with greater frequency following harassment. Reproduction of harassed deer also dropped significantly the year following harassment (1982). These results, and information from the literature, support the contention of several authors that harassment may result in reduced reproduction in big game animals. Recommendations for managing off-highway recreational vehicles on the Eastern Slopes are made with reference to the literature, and the current policy and management setting on the Eastern Slopes and management setting on the Eastern Slopes. The recommendations include development of designated route systems and a user fee on off-highway recreational vehicles to provide funding for OHRV facilities development.
Radiation safety analysis of the management of radioactive sources from lightning rods
Creators: name: Lazarevic, Djordje
name: Milosevic, Miodrag
Publisher: name: Zenodo
Year: 2023
Subjects: radiation safety analysis
Monte Carlo simulations
radioactive sources from lightning rods

description: The paper presents the radiation safety analyses of the management of radioactive sources coming from lightning rods. Such management of sealed sources is part of activities on their planned dismantling and decommissioning activities of old radioactive waste storages in Serbia where dismantled lightning rods are stored. Since these sources cause a large contribution to the radiation dose, the results of the analyses are of primary importance for identifying the potential radiation hazard in order to achieve minimization of operator exposure and the release of radionuclides into the environment. Available data on the production of lightning rods during the 1970s were used, as well as data from operational logs on the receipt of dismantled lightning rods. The methodology used for the analysis of the contribution of direct exposure to ionizing radiation from sources during the planned operations was verified through several experiments. This radiation safety analysis includes reference photon flux calculations based on Monte Carlo simulations and the use of conversion factors for equivalent and effective dose rates according to ICRP-74 and ICRP-116 standards. For the analyses, geometric models were developed for known packages with radioactive sources from the lightning rods for different situations related to the location of sources.
The polyphase morphogenesis of the Lick Creek Cave, Cascade County, Montana, USA
Creators: name: Carriere, Kevin L.
Publisher: name: University of Calgary
Year: 2001
Subjects: subject: AC1 .T484 2001 C374
subject: Geomorphology - Montana - Lick Creek Cave
subject: Karst - Montana - Lick Creek Cave
subject: Caves - Montana
subject: Speleology
subject: Rocks, Carbonate
subject: Madison Group
subject: Lick Creek Cave (Mont.)

description: Bibliography: p. 128-143.
description: CD-Rom included
Sandra Harding, Feminisms, Postcolonialities, and Modernities, Duke University Press Sage, 2008
Creators: name: Mongili, Alessandro
Publisher: name: Tecnoscienza – Italian Journal of Science & Technology Studies
Year: 2011

description: Tecnoscienza – Italian Journal of Science & Technology Studies, Vol. 1 No. 2 (2010): Tecnoscienza Nr. 2
Cordyla crassicornis Meigen 1818
Creators: name: El Mouden, Mohamed Amin
name: Chandler, Peter J.
name: Saidoun, Imane
name: Driauach, Ouafaa
name: Belqat, Boutaïna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Cordyla
Cordyla crassicornis

description: Cordyla crassicornis Meigen, 1818
Material examined.
Morocco – Middle Atlas Region • 1 ♂; Gouffre Izora; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2489 • 2 ♂♂; Grotte Bouslama; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2490 • 1 ♂; Vallée des oiseaux; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2491 • 1 ♂; Forêt Bab Boudir; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2488 • 1 ♂; Oued Tametrhouste; 21/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2492 • 2 ♂♂; Forêt Admam; 22/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2493 • 1 ♂; Oued Azhar; 22/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2494 • 1 ♂; Maison forestière; 23/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2495.
North African distribution.
Morocco (Banamar et al. 2020).
description: Published as part of El Mouden, Mohamed Amin, Chandler, Peter J., Saidoun, Imane, Driauach, Ouafaa & Belqat, Boutaïna, 2025, A new species of Docosia Winnertz, 1864 and new records of fungus gnats (Diptera, Bolitophilidae, Keroplatidae and Mycetophilidae) from North Africa, pp. 349-379 in ZooKeys 1233 on pages 349-379, DOI: 10.3897/zookeys.1233.130502
Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields
Creators: name: Wilksen, Steffen
name: Lohof, Frederik
name: Willmann, Isabell
name: Bopp, Frederik
name: Lienhart, Michelle
name: Thalacker, Christopher
name: Finley, Jonathan
name: Florian, Matthias
name: Gies, Christopher
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electrically controllable quantum-dot molecules (QDMs) are a promising platform for deterministic entanglement generation and, as such, a resource for quantum-repeater networks. We develop a microscopic open-quantum-systems approach based on a time-dependent Bloch-Redfield equation to model the generation of entangled spin states with high fidelity. The state preparation is a crucial step in a protocol for deterministic entangled-photon-pair generation that we propose for quantum repeater applications. Our theory takes into account the quantum-dot molecules' electronic properties that are controlled by time-dependent electric fields as well as dissipation due to electron-phonon interaction. We quantify the transition between adiabatic and non-adiabatic regimes, which provides insights into the dynamics of adiabatic control of QDM charge states in the presence of dissipative processes. From this, we infer the maximum speed of entangled-state preparation under different experimental conditions, which serves as a first step towards simulation of attainable entangled photon-pair generation rates. The developed formalism opens the possibility for device-realistic descriptions of repeater protocol implementations.
description: 12 pages, 11 figures
The HST/ACS Coma Cluster Survey. VIII. Barred Disk Galaxies in the Core of the Coma Cluster
Creators: name: Marinova, Irina
name: Jogee, Shardha
name: Weinzirl, Tim
name: Erwin, Peter
name: Trentham, Neil
name: Ferguson, Henry C.
name: Hammer, Derek
name: Brok, Mark den
name: Graham, Alister W.
name: Carter, David
name: Balcells, Marc
name: Goudfrooij, Paul
name: Guzman, Rafael
name: Hoyos, Carlos
name: Mobasher, Bahram
name: Mouhcine, Mustapha
name: Peletier, Reynier F.
name: Peng, Eric
name: Kleijn, Gijs Verdoes
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (ABRIDGED) We use high resolution (~0.1") F814W ACS images from the HST ACS Treasury survey of the Coma cluster at z~0.02 to study bars in massive disk galaxies (S0s), and in dwarf galaxies in the Coma core. Our study helps constrain the evolution of bars and disks in dense environments and provides a comparison point for studies in lower density environments and at higher redshifts. (1) We characterize the fraction and properties of bars in a sample of 32 bright (M_V <= -18, M_* > 10^9.5 M_sun) S0 galaxies, which dominate the population of massive disk galaxies in the Coma core. Measuring the S0 bar fraction must be handled carefully, as the results depend on the method used: the bar fraction for bright S0s in the Coma core is 50%+/-11%, 65%+/-11%, and 60%+/-11% for three methods of bar detection: strict ellipse fit criteria, relaxed ellipse fit criteria, and visual classification. (2) We compare the S0 bar fraction across different environments (Coma core, A901/902, Virgo). We find that the bar fraction among bright S0 galaxies does not show a statistically significant variation across environments spanning two orders of magnitude in galaxy number density (n~300-10,000 gal/Mpc^3). We speculate that the S0 bar fraction is not significantly enhanced in rich clusters because S0s in rich clusters are less prone to bar instabilities as they are dynamically hot and gas poor due to ram pressure stripping and accelerated star formation. In addition, high-speed encounters in rich clusters may be less effective than slow, strong encounters in inducing bars. (3) We analyze a sample of 333 faint (M_V > -18) dwarf galaxies in the Coma core. Using unsharp-masking, we find only 13 galaxies with bar and/or spiral structure. The paucity of disk structures in Coma dwarfs suggests that either disks are not common in these galaxies, or that any disks present are too hot to develop instabilities.
description: Accepted to ApJ; version with full-resolution figures can be found at http://www.as.utexas.edu/~marinova/COMA_bars.pdf
ASSESSMENT OF LEVELS, DISTRIBUTION, AND ECOLOGICAL RISKS OF POLYCYCLIC AROMATIC HYDROCARBONS FROM SELECTED WASTE DUMPSITES
Creators: name: Julia, Schneider
name: Liam, O'Reilly
name: Fatima, Al-Mansoori
Publisher: name: AYDEN JOURNAL
Year: 2024
Subjects: Level, Distribution, Ecological risk, Bayelsa, Dumpsites, PAHs

description: This study investigates the levels, distribution and ecological risk of polycyclic aromatic hydrocarbons (PAHs) in surface soils of some selected wastes dumpsites in Bayelsa State, Nigeria. Polycyclic aromatic hydrocarbons (PAHs) are petty pollutants frequently seen in quite a lot of vicinity that threaten the populace living in close proximity to them. True representative samples of the study and control areas were collected and analyzed for PAHs using Gas Chromatography– Mass Spectrometer (GC–MS). The analyzed PAHs concentrations varies from 40.256 mg/kg for Swali, 10.63549 mg/kg for Opolo, 60.91517 mg/kg for Tombia Round About, and 19.3009 mg/kg for Igbogene wastes dumpsites respectively. Moreover, the total PAHs concentrations in a given station were seen to be higher than the Dutch guideline maximum limits of 40 mg/kg although not for an individual PAHs. The obtained results equally showed the first and second highest single concentration of PAHs composite detected at an individual site for indeno [1,2,3-cd]pyrene (IcdP) to be 22.55850 mg/kg and 8.784 mg/kg for fluoranthene at Tombia round about, this astronomic rise maybe due to its commercial nerve midpoint in Yenagoa Metropolis.
Joint Active and Passive Beamforming for RIS-aided MIMO Communications with Low-Resolution Phase Shifts
Creators: name: Souto, Nuno
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Practical hardware limitations often impose a reduced number of available phase shifts at the elements of a reconfigurable intelligent surface (RIS). Most works often assume continuous phase-shits at the RIS elements for the transmit and passive beamforming optimization, which can lead to substantial performance loss. Therefore, to harvest the gains of RIS-assisted multi-stream multiple-input multiple-output (MIMO) communications under realistic phase shifts, this letter proposes a problem formulation for the maximization of the achievable rate over the transmit precoder and RIS elements, which avoids an explicit discrete constraint while still incorporating its effect. To efficiently tackle the resulting problem when considering large arrays and RIS panels, an iterative algorithm is derived which comprises a sequence of simple projections. Simulation results demonstrate that the proposed design can be very effective, especially with low-resolution phase-shifts.
description: 5 pages, 3 figures
ARTISTIC ALCHEMY: HOW PUBLIC ART TRANSFORMS URBAN LANDSCAPES INTO COMMUNITY CANVASES
Creators: name: Wei, Dr. Zhang, PhD
name: Wang, Professor Li Na  MBA
Publisher: name: zap Journals
Year: 2023
Subjects: Public art
urban
environment
development

description: With the integration of global economy, the urbanization process in Rwanda develops rapidly. It appears particularly important to build city image. As manifestation of city characteristics, it reflects spiritual outlook of a city.  Public art has participated in the process of transforming the aesthetics and symbolic meanings of civic centers across the country, even though for the most part its creative potential has been curtailed by the priority of urban planning and architecture as shapers of civic space. This research study discusses the role of public art in influencing urban environments in Rwanda, specifically within Kigali Cultural Village. The study explores the extent to which such an approach can raise local communities' environmental awareness as an indirect input to the process of upgrading the desires of those living in these areas and of international tourists. In addition, it reviews the experiences of different types of catalysts for regeneration, such as art and culture that can enhance the built environment's recognition, value, and economic growth. A qualitative evaluation is employed for this research study, which leverages subjective methods such as, consulting research papers and articles, interviews and observations to collect substantive and relevant data while examining the interaction of connectivity, attraction, and development as they relate to economics and other complex aspects of development. The findings reveal the main advantages of introducing public art to an urban space, namely in regard to acceptance, culture, and social behavior. In addition, the study helps identify new ways to use public art to enhance public interactions and participation in new urban environments development
Integrating Functional Oxides with Graphene
Creators: name: Hong, X.
name: Zou, K.
name: DaSilva, A. M.
name: Ahn, C. H.
name: Zhu, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Graphene-oxide hybrid structures offer the opportunity to combine the versatile functionalities of oxides with the excellent electronic transport in graphene. Understanding and controlling how the dielectric environment affects the intrinsic properties of graphene is also critical to fundamental studies and technological development of graphene. Here we review our recent effort on understanding the transport properties of graphene interfaced with ferroelectric Pb(Zr,Ti)O_3 (PZT) and high-k HfO_2. Graphene field effect devices prepared on high-quality single crystal PZT substrates exhibit up to tenfold increases in mobility compared to SiO_2-gated devices. An unusual and robust resistance hysteresis is observed in these samples, which is attributed to the complex surface chemistry of the ferroelectric. Surface polar optical phonons of oxides in graphene transistors play an important role in the device performance. We review their effects on mobility and the high source-drain bias saturation current of graphene, which are crucial for developing graphene-based room temperature high-speed amplifiers. Oxides also introduce scattering sources that limit the low temperature electron mobility in graphene. We present a comprehensive study of the transport and quantum scattering times to differentiate various scattering scenarios and quantitatively evaluate the density and distribution of charged impurities and the effect of dielectric screening. Our results can facilitate the design of multifunctional nano-devices utilizing graphene-oxide hybrid structures.
description: 20 pages, 8 figures, to appear in Solid State Commun. Special Issue on Graphene
Madeleine Akrich, Cécile Méadel and Vololona Rabeharisoa, Se mobiliser pour la santé. Des associations des patients témoignent, Presses de l’Ecole de Mines, 2009
Creators: name: Maestrutti, Marina
Publisher: name: Tecnoscienza – Italian Journal of Science & Technology Studies
Year: 2011

description: Tecnoscienza – Italian Journal of Science & Technology Studies, Vol. 1 No. 2 (2010): Tecnoscienza Nr. 2
Numerical simulation of foam flooding for sweep improvement
Creators: name: Shrivastava, Vijay Kumar
Publisher: name: University of Calgary
Year: 1996
Subjects: subject: TN 871.37 S57 1996
subject: Secondary recovery of oil
subject: Oil fields - Production methods

description: Bibliography: p. 150-156.
description: Foams are used for mobility control in Enhanced Oil Recovery operations involving injection of gases or steam. The ability of foams to lower the mobility of vapour phase, under certain conditions, helps in reducing gravity override and channelling leading to improved sweep efficiency and hence oil recovery. A series of foam-flood experiments were carried out for implementing the process in a carbonate reservoir currently under miscible flood. The present research focuses on simulation of few of these experiments using empirical foam and reaction kinetics models with an objective of establishing parameters critical to field implementation. The mobility reduction factor and the saturation at which the foam breaks down were studied using numerical models that simulated laboratory experiments. Effect of Surfactant Alternate Gas Injection (SAG) cycle, reservoir heterogeneity and economic aspects of the process were evaluated using a field scale numerical model validated by actual foam-tests. Foam flooding was found economically favourable in reservoirs with high permeability intervals near the top.
Dynamic local search for SAT : design, insights and analysis
Creators: name: Tompkins, David Andrew Douglas
Publisher: name: University of British Columbia
Year: 2010

description: In Boolean logic, a formula is satisfiable if a variable assignment exists that will make the formula equivalent to true, and the propositional satisfiability problem (SAT) is to determine if a given formula is satisfiable. SAT is one of the most fundamental problems in computer science, and since many relevant combinatorial problems can be encoded into SAT, it is of substantial theoretical and practical interest. A popular and successful approach to solving combinatorial problems such as SAT is Stochastic Local Search (SLS). In this dissertation we focus on SLS algorithms for SAT, which can find satisfying variable assignments effectively, but cannot determine if no satisfying variable assignment exists. Our primary goal is to advance the state-of-the-art for SLS algorithms for SAT. We accomplish this goal explicitly by developing new SLS algorithms that outperform the existing algorithms on interesting benchmark problems, and implicitly by advancing the understanding of current algorithms and introducing tools for developing new algorithms. The prevalent theme of our work is Dynamic Local Search (DLS), where DLS algorithms use their search history to dynamically change their behaviour. The cornerstone of this dissertation is UBCSAT, a software framework we developed for efficiently implementing and empirically evaluating SLS algorithms for SAT. We present the Scaling and Probabilistic Smoothing (SAPS) algorithm, which is amongst the state-of-the-art SLS algorithms for SAT. We provide an in-depth study of a class of DLS algorithms, analyze their performance and significantly advance the understanding of their behaviour. We also advance the understanding of the role of random decisions in SLS algorithms, by providing an empirical analysis on both the quality and quantity of random decisions. The capstone of this dissertation is a new conceptual model for representing and designing SLS algorithms for SAT. We introduce a new software design architecture that implements our model and is specifically designed to leverage recent tools to automate many of the tedious aspects of algorithm design. We demonstrate that by following our new algorithm design approach, we have achieved significant improvements over previous state-of-the-art SLS algorithms for SAT on encodings of software verification benchmark instances.
The Anatomy of Conspirators: Unveiling Traits using a Comprehensive Twitter Dataset
Creators: name: Gambini, Margherita
name: Tardelli, Serena
name: Tesconi, Maurizio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: The discourse around conspiracy theories is currently thriving amidst the rampant misinformation in online environments. Research in this field has been focused on detecting conspiracy theories on social media, often relying on limited datasets. In this study, we present a novel methodology for constructing a Twitter dataset that encompasses accounts engaged in conspiracy-related activities throughout the year 2022. Our approach centers on data collection that is independent of specific conspiracy theories and information operations. Additionally, our dataset includes a control group comprising randomly selected users who can be fairly compared to the individuals involved in conspiracy activities. This comprehensive collection effort yielded a total of 15K accounts and 37M tweets extracted from their timelines. We conduct a comparative analysis of the two groups across three dimensions: topics, profiles, and behavioral characteristics. The results indicate that conspiracy and control users exhibit similarity in terms of their profile metadata characteristics. However, they diverge significantly in terms of behavior and activity, particularly regarding the discussed topics, the terminology used, and their stance on trending subjects. In addition, we find no significant disparity in the presence of bot users between the two groups. Finally, we develop a classifier to identify conspiracy users using features borrowed from bot, troll and linguistic literature. The results demonstrate a high accuracy level (with an F1 score of 0.94), enabling us to uncover the most discriminating features associated with conspiracy-related accounts.
Photons production in heavy-ion collisions as a signal of deconfinement phase
Creators: name: Nedelko, Sergei
name: Nikolskii, Aleksei
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The photon production due to conversion of two gluons into a photon, $gg\rightarrowγ$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.
description: 26 pages, 7 figures. Version accepted for publication in Eur. Phys. J. A
Inter-subband resistance oscillations in crossed electric and magnetic fields
Creators: name: Dietrich, Scott
name: Byrnes, Sean
name: Vitkalov, Sergey
name: Goran, A. V.
name: Bykov, A. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum oscillations of nonlinear resistance are investigated in response to electric current and magnetic field applied perpendicular to single GaAs quantum wells with two populated subbands. At small magnetic fields current-induced oscillations appear as Landau-Zener transitions between Landau levels inside the lowest subband. Period of these oscillations is proportional to the magnetic field. At high magnetic fields different kind of quantum oscillations emerges with a period,which is independent of the magnetic field. At a fixed current the oscillations are periodic in inverse magnetic field with a period that is independent of the dc bias. The proposed model considers these oscillations as a result of spatial variations of the energy separation between two subbands induced by the electric current.
description: 9 Pages, 10 Figures