cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optical Network Models and their Application to Software-Defined Network Management
Creators: name: Szyrkowiec, Thomas
name: Autenrieth, Achim
name: Kellerer, Wolfgang
Publisher: name: arXiv
Year: 2018
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Software-defined networking is finding its way into optical networks. Here, it promises a simplification and unification of network management for optical networks allowing automation of operational tasks despite the highly diverse and vendor-specific commercial systems and the complexity and analog nature of optical transmission. A fundamental component for software-defined optical networking are common abstractions and interfaces. Currently, a number of models for optical networks are available. They all claim to provide open and vendor agnostic management of optical equipment. In this work, we survey and compare the most important models and propose an intent interface for creating virtual topologies that is integrated in the existing model ecosystem.
description: Parts of the presented work has received funding from the European Commission within the H2020 Research and Innovation Programme, under grant agreeement n.645127, project ACINO
title: Historia Clínica de plano topográfico del AGN (2020)
title: Plano topográfico de una parte de los terrenos baldíos historia clínica código en el archivo : folio 452, tomo 2. bienes nacionales clave en la universidad : 597-2020
titleType: AlternativeTitle
Creators: name: Sabogal Gracia, Sofía
Publisher: name: Universidad Externado de Colombia
Year: 2021
Subjects: subject: Conservación de documentos
subject: Cartografía - Metodología
subject: Conservación y restauración de manuscritos
subject: Taller de bienes gráficos y documentales
subject: Archivo General de la Nación
subject: Conservación y restauración

description: En el marco de la asignatura Taller de Bienes Gráficos y documentales, se realizó la intervención de una obra catalogada como un Plano topográfico (siglo XIX) que hace parte del acervo documental del Archivo General de la Nación. Este documento recoge toda la información pertinente para la intervención, desde el contexto histórico, el estado de conservación de la pieza y la propuesta de intervención a llevar a cabo, finalizando con la explicación de cada uno de los procesos realizados sobre la obra gráfica.
description: Within the framework of the Graphic and Documentary Assets Workshop, the intervention was carried out on a work classified as a Topographic Plan (19th century) that is part of the documentary heritage of the General Archive of the Nation. This document contains all the pertinent information for the intervention, from the historical context, the state of conservation of the piece and the intervention proposal to be carried out, ending with the explanation of each of the processes carried out on the graphic work.
Social isolation induces hyperactivity and exploration in aged female mice
Creators: name: Sullens, D. Gregory
name: Gilley, Kayla
name: Jensen, Kendall
name: Vichaya, Elisabeth
name: Dolan, Sara
name: Sekeres, Melanie
Publisher: name: My University
Year: 2021

description: Prolonged social isolation is associated with poor physical and mental health outcomes, findings observed in both humans, and rodent models of isolation. Humans, like mice, may engage in enhanced exploratory and social behaviour following isolation, which may protect against subsequent cognitive decline and psychological distress. Understanding how these effects may impact behaviour in older adults is particularly relevant, as this population is likely to experience periods of late-life social isolation. We report that late-life social isolation in female mice did not lead to robust depressive-like symptomology, altered social interaction behaviour, sensitivity to context fear acquisition and memory, or alterations in inflammatory cytokines (IL-6, IL-1β, Tnf-α) or microglial activation (Itgam) within the hippocampus. Rather, isolation increased hyperactivity and exploration behaviours. These findings have translational value as the first female mouse model of late-life social isolation, and provide evidence to inform the development of interventions aimed at promoting functional recovery following isolation in late-life.
Fibonacci Topological Superconductor
Creators: name: Hu, Yichen
name: Kane, C. L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We introduce a model of interacting Majorana fermions that describes a superconducting phase with a topological order characterized by the Fibonacci topological field theory. Our theory, which is based on a $SO(7)_1/(G_2)_1$ coset factorization, leads to a solvable one dimensional model that is extended to two dimensions using a network construction. In addition to providing a description of the Fibonacci phase without parafermions, our theory predicts a closely related "anti-Fibonacci" phase, whose topological order is characterized by the tricritical Ising model. We show that Majorana fermions can split into a pair of Fibonacci anyons, and propose an interferometer that generalizes the $Z_2$ Majorana interferometer and directly probes the Fibonacci non-Abelian statistics.
Tomographic Simulations of Accretion Disks in Cataclysmic Variables - Flickering and Wind
Creators: name: Ribeiro, Fabiola M. A.
name: Diaz, Marcos P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Both continuum and emission line flickering are phenomena directly associated with the mass accretion process. In this work we simulate accretion disk Doppler maps including the effects of winds and flickering flares. Synthetic flickering Doppler maps are calculated and the effect of the flickering parameters on the maps is explored. Jets and winds occur in many astrophysical objects where accretion disks are present. Jets are generally absent among the cataclysmic variables (CVs), but there is evidence of mass loss by wind in many objects. CVs are ideal objects to study accretion disks and consequently to study the wind associated with these disks. We also present simulations of accretion disks including the presence of a wind with orbital phase resolution. Synthetic H-alpha line profiles in the optical region are obtained and their corresponding Doppler maps are calculated. The effect of the wind simulation parameters on the wind line profiles is also explored. From this study we verified that optically thick lines and/or emission by diffuse material into the primary Roche lobe are necessary to generate single peaked line profiles, often seen in CVs. The future accounting of these effects is suggested for interpreting Doppler tomography reconstructions.
description: 9 pages, 9 figures
Critical phenomena at the complex tensor ordering phase transition
Creators: name: Boettcher, Igor
name: Herbut, Igor F.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the critical properties of the phase transition towards complex tensor order that has been proposed to occur in spin-orbit coupled superconductors. For this purpose we formulate the bosonic field theory for fluctuations of the complex irreducible second-rank tensor order parameter close to the transition. We then determine the scale dependence of the couplings of the theory by means of the perturbative Renormalization Group (RG). For the isotropic system we generically detect a fluctuation-induced first-order phase transition. The initial values for the running couplings are determined by the underlying microscopic model for the tensorial order. As an example we study three-dimensional Luttinger semimetals with electrons at a quadratic band touching point. Whereas the strong-coupling transition of the model receives substantial fluctuation corrections, the weak-coupling transition at low temperatures is rendered only weakly first-order due to the presence of a fixed point in the vicinity of the RG trajectory. If the number of fluctuating complex components of the order parameter is reduced by cubic anisotropy, the theory maps onto the field theory for frustrated magnetism.
description: 23 pages
Convective evaporation of vertical films
Creators: name: Boulogne, François
name: Dollet, Benjamin
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Motivated by the evaporation of soap films, which has a significant effect on their lifetime, we performed an experimental study on the evaporation of vertical surfaces with model systems based on hydrogels. From the analogy between heat and mass transfer, we adopt a model describing the natural convection in the gas phase due to a density contrast between dry and saturated air. Our measurements show a good agreement with this model, both in terms of scaling law with the Grashof number and in terms of order of magnitude. We discuss the corrections to take into account, notably the contribution of edge effects, which have a small but visible contribution when lateral and bottom surface areas are not negligible compared to the main evaporating surface area.
Riesgo de negligencia contractual del interventor en proyectos de infraestructura pública en Colombia
Creators: name: Arcila Rodríguez, Diego
Publisher: name: Universidad Externado de Colombia
Year: 2023
Subjects: subject: Productividad del trabajo
subject: Contratos
subject: Infraestructura - Economía
subject: Riesgo
subject: Negligencia profesional
subject: Interventoría
subject: Infraestructura
subject: Deber de cuidado

description: El propósito de este trabajo es analizar uno de los riesgos previsibles que el interventor como profesional y empresario que ejerce la consultoría en Colombia debe identificar y gestionar: el riesgo de negligencia profesional de su propio personal. Este estudio se realiza a través del enfoque cualitativo para, en primer lugar, analizar los contratos de consultoría e interventoría y establecer las obligaciones y deberes de conducta que le son exigibles. En la segunda parte, el estudio identificará los procesos internos en los que el empresario interventor debe enfocarse para gestionar el riesgo de negligencia profesional. Las estipulaciones generales de los contratos de concesión 4G, “Red Férrea”, y lo ocurrido hasta el momento en el proyecto Hidroituango serán un recurso didáctico para el desarrollo de la narrativa de esta monografía.
description: The purpose of this work is to analyze one of the foreseeable risks that the auditor, as a professional and entrepreneur who practices consulting in Colombia, must identify and manage based on their behavioral duties: the risk of negligence of their staff. This study is carried out through a qualitative approach to, in the first place, establish the essence of consulting and auditing contracts, which allows determining their conduct duties based on the diligence that is required of them. In the second part, the study will identify the internal processes on which the financial controller must focus to manage the risk of negligence from the point of view of pure and speculative risk. The general stipulations of the 4G concession contracts, “Red Férrea”, and what has happened so far in the Hidroituango project will be a didactic resource for the development of the narrative of this monograph.
Cosmic anisotropy with Reduced Relativistic Gas
Creators: name: Reis, Simpliciano Castardelli dos
name: Shapiro, Ilya L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The dynamics of cosmological anisotropies is investigated for Bianchi type I universe filled by a relativistic matter represented by the reduced relativistic gas model (RRG), with equation of state interpolating between radiation and matter. Previously it was shown that the interpolation is observed in the background cosmological solutions for homogeneous and isotropic universe and also for the linear cosmological perturbations. We extend the application of RRG to the Bianchi type I anisotropic model and find that the solutions evolve to the isotropic universe with the pressureless matter contents.
description: 18 pages, 4 figures. Added small Appendix and a few extra references, slightly extended discussion on the possible application of the results. Version accepted in European Journal of Physics C, with LaTeX format modified accordingly
Point Divergence Gain and Multidimensional Data Sequences Analysis
Creators: name: Rychtáriková, Renata
name: Korbel, Jan
name: Macháček, Petr
name: Štys, Dalibor
Publisher: name: arXiv
Year: 2018
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We introduce novel information-entropic variables -- a Point Divergence Gain ($Ω^{(l \rightarrow m)}_α$), a Point Divergence Gain Entropy ($I_α$), and a Point Divergence Gain Entropy Density ($P_α$) -- which are derived from the Rényi entropy and describe spatio-temporal changes between two consecutive discrete multidimensional distributions. The behavior of $Ω^{(l \rightarrow m)}_α$ is simulated for typical distributions and, together with $I_α$ and $P_α$, applied in analysis and characterization of series of multidimensional datasets of computer-based and real images.
description: 18 pages, 7 figures
Tunneling in Quantum Cosmology and Holographic SYM theory
Creators: name: Ghoroku, Kazuo
name: Nakano, Yoshimasa
name: Tachibana, Motoi
name: Toyoda, Fumihiko
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the time evolution of early universe which is developed by a cosmological constant $Λ_4$ and supersymmetric Yang-Mills (SYM) fields in the Friedmann-Robertson-Walker (FRW) space-time. The renormalized vacuum expectation value of energy-momentum tensor of the SYM theory is obtained in a holographic way. It includes a radiation of the SYM field, parametrized as $C$. The evolution is controlled by this radiation $C$ and the cosmological constant $Λ_4$. For positive $Λ_4$, an inflationary solution is obtained at late time. When $C$ is added, the quantum mechanical situation at early time is fairly changed. Here we perform the early time analysis in terms of two different approaches, (i) the Wheeler-DeWitt equation and (ii) Lorentzian path-integral with the Picard-Lefschetz method by introducing an effective action. The results of two methods are compared.
description: 28 pages, 10 figures
Arithmetic modular links
Creators: name: Migueles, José Andrés Rodríguez
name: Pinsky, Tali
name: Purcell, Jessica S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geometric Topology (math.GT)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We construct a sequence of geodesics on the modular surface such that the complement of the canonical lifts to the unit tangent bundle are arithmetic 3-manifolds.
description: version accepted to PJM
Secukinumab treatment of axial spondyloarthritis in real world: Achievement of fast response results in effective treatment outcomes
Creators: name: Kugler, Sabine
name: Mackay, Sina
name: Schulz, Daniel
name: Klippstein, Maximilian
name: Kiltz, Uta
name: Brandt-Jürgens, Jan
name: Gmeiner, Benjamin
name: Vodencarevic, Asmir
name: Peterlik, Daniel
name: Wendt, Guillaume
name: Behrens, Frank
name: Köhm, Michaela
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2022

description: Background: Individualized treatment strategies are of high importance in the treatment of patients with chronic immune-mediated diseases such as axial sponyloarthritis (axSpA) IL17 inhibition has demonstrated good efficacy on all manifestations of axSpA but in some patients a lack of efficacy can be observed. To analyze patient characteristics leading to treatment response pattern in axSpA patients, data from the German non-interventional study “AQUILA” (Kiltz et al. 2019) was analyzed. Methods: “AQUILA” includes, in addition to patients with psoriatic arthritis, patients with active axSpA. In the current analysis, patients started treatment within a period of 4 weeks around their baseline visit (V1), and were followed-up over up to 52 weeks (V2-V6). Response in this cohort was defined as a combination of patient- (BASDAI) and physician-derived (PhGA) assessments. Patients who reached a state of remission (BASDAI ≤ 3 and PhGA ≤ 1) or adequate improvement (20% improvement in BASDAI and PhGA compared to baseline) at any time during the study period were considered responders. A fast response was defined as reaching at least adequate improvement within the first 8 weeks of treatment (V2), all other responses were considered as late responses. Results: A cohort of 358 axSpA patients was analyzed and divided into 3 subgroups (Table 1). Fast response was significantly associated with biological naivety (p=0.04) and stronger therapy effect during the further course of treatment with higher rates of 50% response (p=0.007) and remission state (p=0.03). Conclusion: Our results show that secukinumab is an effective biologic treatment in axSpA patients. As with every available treatment option, its response is dependent on demographics and disease characteristics. The results underline the dependency of fast response on clinical phenotype. Fast responders seem to benefit from both fast alleviation of symptoms and effective treatment outcomes.
Improved quantum capacity bounds of Gaussian loss channels and achievable rates with Gottesman-Kitaev-Preskill codes
Creators: name: Noh, Kyungjoo
name: Albert, Victor V.
name: Jiang, Liang
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Gaussian loss channels are of particular importance since they model realistic optical communication channels. Except for special cases, quantum capacity of Gaussian loss channels is not yet known completely. In this paper, we provide improved upper bounds of Gaussian loss channel capacity, both in the energy-constrained and unconstrained scenarios. We briefly review the Gottesman-Kitaev-Preskill (GKP) codes and discuss their experimental implementation. We then prove, in the energy-unconstrained case, that the GKP codes achieve the quantum capacity of Gaussian loss channels up to at most a constant gap from the improved upper bound. In the energy-constrained case, we formulate a biconvex encoding and decoding optimization problem to maximize the entanglement fidelity. The biconvex optimization is solved by an alternating semidefinite programming (SDP) method and we report that, starting from random initial codes, our numerical optimization yields GKP codes as the optimal encoding in a practically relevant regime.
description: 18 pages, 4 figures
ComPIL 2.0 and MetaNovo tools for metaproteomics searches within Galaxy: searching for needles in a Haystack
Creators: name: Wagner, Reid
name: Thuy-Boun, Peter
name: McArdle, Andrew
name: Mehta, Subina
name: Johnson, James
name: Grüning, Björn
name: Cuccuru, Gianmauro
name: Wolan, Dennis
name: Griffin, Timothy
name: Pratik Jagtap
Publisher: name: F1000 Research Limited
Year: 2021

description: Metaproteomics research poses a challenge in detection of peptides from microbiome samples, especially if the matching metagenomics data is not available. In order to accurately identify the taxonomic and functional composition using mass spectrometry, comprehensive protein sequence database searches are recommended. ComPIL 2.0 (DOI:10.1021/acs.jproteome.8b00722) and MetaNovo (DOI:10.1101/605550) tools provide the ability to detect proteins representative of the taxonomic composition of the metaproteomic data and later generate a compact, reduced database for deeper characterization of the microbiome. We present the Galaxy integration of MetaNovo and ComPIL 2.0.

 ComPIL 2.0 uses a MongoDB database structure for the protein sequences, which is later used by ProLuCID-Compil to search for spectral matches against a large protein database. We developed a Galaxy tool for ProLuCID-Compil, and propose a publicly available database with an open-sourced Ansible suite. The original ComPIL 2.0 database was 1.5TB, deployed on a cluster of 8 nodes, each with a 6-core E5-1650 v2 CPU and 64GB RAM.

 The MetaNovo tool, on the other hand, uses input MS/MS data and a large protein database FASTA file. Sequence tags are generated from the MS/MS data to search the database, ranking proteins to produce a reduced database. Our Galaxy tool manages this user input, configuration, and executes the MetaNovo Singularity image on the instance. We demonstrate the use of MetaNovo on a coral eggs metaproteomics dataset to characterize the functional microbiome.

 Tool repository (compil, metanovo branches): github.com/galaxyproteomics/tools-galaxyp
 ComPIL 2.0 deployment repository: github.com/usegalaxy-eu/ansible-compil
Métodos de aprendizaje en línea
Creators: name: Ortiz Arciniegas, Emma Elvira
Publisher: name: Universidad Externado de Colombia
Year: 2019

description: Objetivos generales: Presentar alternativas educativas que contribuyan al desarrollo de propuestas pedagógicas que respondan a las necesidades del mundo actual. Objetivos específicos: Identificar el potencial pedagógico de las técnicas activas de aprendizaje y su planteamiento en una plataforma tecnológica. Reconocer estrategias metodológicas apoyadas en TIC, para favorecer el desarrollo de procesos de aprendizaje más autónomos, volcados hacia el estudiante. Fortalecer el aprendizaje autónomo, significativo y colaborativo a través de la participación en foros, ejercicios, casos, problemas y proyectos. Reconstruir conceptos propios y recreen las estrategias de aula más adecuadas para favorecer el desarrollo de procesos educativos tendientes a promover el desarrollo procesos de aprendizaje más autónomos, volcados hacia el estudiante, incorporando TIC. Valorar los aportes desde la didáctica general y la incorporación de TIC en la construcción de experiencias educativas acordes con las exigencias del momento actual. Ganar identidad en relación con estrategias de aula conducentes a una intervención coherente con procesos de desarrollo del estudiante. Diseñar estrategias de aprendizaje, aplicando principios de aprendizaje autónomo, significativo y colaborativo con utilización de TIC y recursos o materiales didácticos de variado formato digital.
description: La recopilación de documentos y actividades de aprendizaje que contiene este módulo busca abrir una discusión alrededor de las estrategias metodológicas para el desarrollo de la inteligencia y su importancia para todo docente, consciente de la gran responsabilidad que tiene como mediador y acompañante de procesos de formación integral.
String-theory Realization of Modular Forms for Elliptic Curves with Complex Multiplication
Creators: name: Kondo, Satoshi
name: Watari, Taizan
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It is known that the L-function of an elliptic curve defined over Q is given by the Mellin transform of a modular form of weight 2. Does that modular form have anything to do with string theory? In this article, we address a question along this line for elliptic curves that have complex multiplication defined over number fields. So long as we use diagonal rational N=(2,2) superconformal field theories for the string-theory realizations of the elliptic curves, the weight-2 modular form turns out to be the Boltzmann-weighted (q^{L_0-c/24}-weighted) sum of U(1) charges with F e^{ πi F} insertion computed in the Ramond sector.
description: 48 pages; minor corrections and improvements in v2
Time-optimal multi-qubit gates: Complexity, efficient heuristic and gate-time bounds
Creators: name: Baßler, Pascal
name: Heinrich, Markus
name: Kliesch, Martin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Multi-qubit entangling interactions arise naturally in several quantum computing platforms and promise advantages over traditional two-qubit gates. In particular, a fixed multi-qubit Ising-type interaction together with single-qubit X-gates can be used to synthesize global ZZ-gates (GZZ gates). In this work, we first show that the synthesis of such quantum gates that are time-optimal is NP-hard. Second, we provide explicit constructions of special time-optimal multi-qubit gates. They have constant gate times and can be implemented with linearly many X-gate layers. Third, we develop a heuristic algorithm with polynomial runtime for synthesizing fast multi-qubit gates. Fourth, we derive lower and upper bounds on the optimal GZZ gate-time. Based on explicit constructions of GZZ gates and numerical studies, we conjecture that any GZZ gate can be executed in a time O(n) for n qubits. Our heuristic synthesis algorithm leads to GZZ gate-times with a similar scaling, which is optimal in this sense. We expect that our efficient synthesis of fast multi-qubit gates allows for faster and, hence, also more error-robust execution of quantum algorithms.
description: 19+4 pages, 2 figures
Peculiar bonding associated with atomic doping and hidden honeycombs in borophene
Creators: name: Lee, Chi-Cheng
name: Feng, Baojie
name: D'angelo, Marie
name: Yukawa, Ryu
name: Liu, Ro-Ya
name: Kondo, Takahiro
name: Kumigashira, Hiroshi
name: Matsuda, Iwao
name: Ozaki, Taisuke
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Engineering atomic-scale structures allows great manipulation of physical properties and chemical processes for advanced technology. We show that the B atoms deployed at the centers of honeycombs in boron sheets, borophene, behave as nearly perfect electron donors for filling the graphitic $σ$ bonding states without forming additional in-plane bonds by first-principles calculations. The dilute electron density distribution owing to the weak bonding surrounding the center atoms provides easier atomic-scale engineering and is highly tunable via in-plane strain, promising for practical applications, such as modulating the extraordinarily high thermal conductance that exceeds the reported value in graphene. The hidden honeycomb bonding structure suggests an unusual energy sequence of core electrons that has been verified by our high-resolution core-level photoelectron spectroscopy measurements. With the experimental and theoretical evidence, we demonstrate that borophene exhibits a peculiar bonding structure and is distinctive among two-dimensional materials.
description: 5 pages, 3 figures, 1 table
Photon mediated energy, linear and angular momentum transport in fullerene and graphene systems beyond local equilibrium
Creators: name: Wang, Jian-Sheng
name: Antezza, Mauro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Based on a tight-binding model for the electron system, we investigate the transfer of energy, momentum, and angular momentum mediated by electromagnetic fields among buckminsterfullerene (C$_{60}$) and graphene nano-strips. Our nonequilibrium Green's function approach enables calculations away from local thermal equilibrium where the fluctuation-dissipation theorem breaks down. For example, the forces between C$_{60}$ and current-carrying nano-strips are predicted. It is found that the presence of current usually enhances the van der Waals attractive forces. For two current-carrying graphene strips rotated at some angle, the fluctuational force and torque are much stronger at the nanoscale compared to that of the static Biot-Savart law.
description: 11 pages, 11 figures
A View from the Engine Room: Computational Support for Symbolic Model Checking
Creators: name: Bryant, Randal E.
Publisher: name: Carnegie Mellon University
Year: 2004
Subjects: subject: 89999 Information and Computing Sciences not elsewhere classified
subject: FOS: Computer and information sciences

description: Symbolic model checking owes much of its success to powerful methods for reasoning about Boolean functions. The first symbolic model checkers used Ordered Binary Decision Diagrams (OBDDs) [1] to represent system transition relations and sets of system states [9]. All of the steps required for checking a model can be expressed as a series of operations on these representations, without ever enumerating individual states or transitions. More recently, bounded [3] and unbounded [10, 11] model checkers have been devised that use Boolean satisfiability (SAT) solvers as their core computational engines. Methods having a SAT solver work on a detailed system model and OBDDs operate on an abstracted model have shown that the combination of these two reasoning techniques can be more powerful than either operating on its own [4]. Boolean methods have enabled model checkers to scale to handle some of the complex verification problems arising from real-world hardware and software designs. Given the importance of Boolean reasoning in symbolic checking, we take this opportunity to examine the capabilities of SAT solvers and BDD packages.We use several simple experimental evaluations to illustrate some strengths and weaknesses of current approaches, and suggest directions for future research.
El nido de los pájaros : micropolítica, memoria e Imágenes de la migración forzosa
Creators: name: Moreno Escarraga, Oscar Mauricio
Publisher: name: Universidad Externado de Colombia
Year: 2022
Subjects: subject: Desplazamiento forzado
subject: Desarrollo urbano
subject: Comunitarismo
subject: Migración forzosa
subject: Micropolítica
subject: Memoria
subject: Imagen poética
subject: Mito

description: El Nido de los Pájaros: Micropolítica, Memoria e Imágenes de la Migración Forzosa es un tejido de propuestas artísticas que se materializa desde experiencias sensibles y afectivas, memorias personales y colectivas, imágenes y narrativas sobre la migración forzosa, en el contexto de la guerra en Colombia de mediados del siglo XX a la actualidad. Las propuestas artísticas que hacen parte de “El Nido de los Pájaros” prestan atención a los relatos de vida, a las redes comunitarias, a los liderazgos sociales en nuestro país, desde un eje de trabajo que propone encuentros entre la creación artística, los estudios sociales y las prácticas culturales y ancestrales. La tesis consta de las propuestas: “Mi Casa Mi Cuerpo” (2006-2014), “La Casa de la Frontera” (2015-2016), “Radio Conversa” (2017-2020) y “El Nido de los Pájaros” (2014-2022). A través de viajes por diversos lugares, de encuentros, conversaciones y acciones colectivas, se descubre en el horizonte de la micropolítica un eje de trabajo fundamental, en el que aparece con fuerza inesperada una pregunta por la memoria familiar, y en el que empieza a dibujarse una inquietud por los vínculos entre la poética y el pensamiento mítico.
description: “The Bird´s Nest: Micropolitics, Memory and Images of Forced Migration” is a tissue of artistic proposals that materialize from sensitive and affective experiences, personal and collective memories, images and narratives about forced migration, in the context of war in Colombia from de mid-20th century to the present. The artistic proposals that are part of “The Bird´s Nest” pay attention to life stories, community networks, and social leadership in our country, from a line of work that proposes encounters between artistic creation, social and cultural studies and ancestral practices. The thesis consists of the proposals: “My House My Body” (2006-2014), “The Border House” (2015-2016), “Talk Radio” (2017-2020), “The Bird´s Nest” (2014-2022), Through trips to various places, meetings, conversations and collective actions, a fundamental axis of work is discovered on the horizon of micropolitics, in which a question about family memory appears with unexpected force, and in which begins to draw a concern for the links between poetics and mythical thought.
Impact du Partenariat Public Privé (PPP) sur le développement économique du Sénégal Dans quelles mesures le PPP dans le secteur de la construction permet-il le développement économique du Sénégal ?
Creators: name: Diop, Sokhna Assiatou
Publisher: name: My University
Year: 2018

description: Ce mémoire de recherche propose une analyse du Partenariat Public Privé (PPP) dans le domaine de la construction au Sénégal. Plus précisément il est posé la question suivante : Dans quelle mesure le PPP dans le secteur de la construction permet-il le développement économique du Sénégal ? À travers un recensement de la littérature, les effets du PPP sur le secteur du Bâtiment et des Travaux Publics (BTP) ont été passés en revue. Pour bien saisir les impacts du PPP, cette étude a d’abord présenté les caractéristiques du secteur de la construction en passant par les cadres, institutionnel, économique et social. Le constat fait est que le secteur présente plusieurs failles qui sont au désavantage des firmes locales. Premièrement, l’accès limité au financement ne leur permet pas de s’agrandir. Ensuite, le manque de qualification faisant office dans le secteur ne donne pas aux PME un avantage de savoir faire. Enfin, la prise en charge étatique face aux failles est à améliorer. En outre, à travers l’étude de cas de l’autoroute à péage sénégalaise Dakar-Diamniadio, il a été relevé le fait que le PPP avantage plus les firmes étrangères que les firmes locales. Étant donné un nombre limité de grandes entreprises nationales, les entreprises étrangères raflent les marchés réalisés à travers le PPP. Toutefois, le projet réalisé grâce au PPP comporte plusieurs avantages socioéconomiques pour le peuple sénégalais. Ce travail propose des mesures d’atténuation des effets négatifs du PPP, afin que ce dernier soit un réel vecteur de développement pour le Sénégal et la sous-région africaine.
Diffusion and mixing in globular clusters
Creators: name: Meiron, Yohai
name: Kocsis, Bence
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Collisional relaxation describes the stochastic process with which a self-gravitating system near equilibrium evolves in phase space due to the fluctuating gravitational field of the system. The characteristic timescale of this process is called the relaxation time. In this paper, we highlight the difference between two measures of the relaxation time in globular clusters: (i) the diffusion time with which the isolating integrals of motion (i.e. energy E and angular momentum magnitude L) of individual stars change stochastically and (ii) the asymptotic timescale required for a family of orbits to mix in the cluster. More specifically, the former corresponds to the instantaneous rate of change of a star's E or L, while the latter corresponds to the timescale for the stars to statistically forget their initial conditions. We show that the diffusion timescales of E and L vary systematically around the commonly used half-mass relaxation time in different regions of the cluster by a factor of ~10 and ~100, respectively, for more than 20% of the stars. We define the mixedness of an orbital family at any given time as the correlation coefficient between its E or L probability distribution functions and those of the whole cluster. Using Monte Carlo simulations, we find that mixedness converges asymptotically exponentially with a decay timescale that is ~10 times the half-mass relaxation time.
description: Accepted for publication in ApJ
Introduction to a Cloud-Based Data Storage Solution for the Research Community
Creators: name: Mercier, Paul
Publisher: name: My University
Year: 2018

description: Presentation given at Talking about data storage: A research data conversation, a half-day conference hosted at the University of Ottawa April 19, 2018. Introduction to a cloud-based data storage solution for the University of Ottawa research community. Présentation faite lors de la conférence Parlons du stockage des données : Une conversation de recherche une conférence d'une demi-journée organisée à l'Université d'Ottawa le 19 avril 2018. Introduction à une solution de stockage de données en nuage pour la communauté de recherche de l’Université d’Ottawa.
Nonequilibrium Transport in a Superfluid Josephson Junction Chain: Is There Negative Differential Conductivity?
Creators: name: Begg, Samuel E.
name: Davis, Matthew J.
name: Reeves, Matthew T.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider the far-from-equilibrium quantum transport dynamics in a 1D Josephson junction chain of multi-mode Bose-Einstein condensates. We develop a theoretical model to examine the experiment of R. Labouvie et al. [Phys. Rev. Lett. 115, 050601 (2015)], wherein the phenomenon of negative differential conductivity (NDC) was reported in the refilling dynamics of an initially depleted site within the chain. We demonstrate that a unitary c-field description can quantitatively reproduce the experimental results over the full range of tunnel couplings, and requires no fitted parameters. With a view towards atomtronic implementations, we further demonstrate that the filling is strongly dependent on spatial phase variations stemming from quantum fluctuations. Our findings suggest that the interpretation of the device in terms of NDC is invalid outside of the weak coupling regime. Within this restricted regime, the device exhibits a hybrid behaviour of NDC and the AC Josephson effect. A simplified circuit model of the device will require an approach tailored to atomtronics that incorporates quantum fluctuations.
description: 5 + 6 pages, 4 + 7 figures
Cosmic ray acceleration in magnetic circumstellar bubbles
Creators: name: Zirakashvili, V. N.
name: Ptuskin, V. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We consider the diffusive shock acceleration in interstellar bubbles created by powerful stellar winds of supernova progenitors. Under the moderate stellar wind magnetization the bubbles are filled by the strongly magnetized low density gas. It is shown that the maximum energy of particles accelerated in this environment can exceed the "knee" energy in the observable cosmic ray spectrum.
description: 9 pages, 6 figures, corrected version, accepted to Astroparticle Physics
Investing in the Canadian Arctic: A Policy Proposal to Protect Canada’s de facto Sovereignty in the North
Creators: name: Cameron, Ian B.
Publisher: name: My University
Year: 2018

description: This paper seeks to determine to what extent, if at all, Canada’s sovereignty is threatened in the changing Arctic. Its goal is to define the scope and severity of the threat, and to determine if current policy responses and plans by the federal government are fit to adequately address that threat. As commercial opportunities proliferate and foreign actors express interest, can Canada truly claim to be sovereign in the Arctic? If so, is that sovereignty tenable? This paper will conclude that there does exist a threat to Canada’s Arctic sovereignty: Canada risks abdicating its de facto sovereignty in the Arctic through its persistent inability to develop and govern its portion of the region. As commercial endeavors proliferate, governments will need to provide the infrastructure and governance necessary to support business. If Canada does not lead this effort, other actors will. This paper will also conclude that the government’s policy responses to date do not appropriately address the real threats that Canada faces. We will therefore suggest new policy initiatives which we recommend the government implement.
Deutsche Normungsroadmap Künstliche Intelligenz
Creators: name: Adler, Rasmus
name: Bunte, Andreas
name: Burton, Simon
name: Großmann, Jürgen
name: Jaschke, Alexander
name: Kleen, Philip
name: Lorenz, Jeanette Miriam
name: Ma, Jackie
name: Markert, Karla
name: Meeß, Henri
name: Meyer, Olga
name: Neuhüttler, Jens
name: Philipp, Patrick
name: Poretschkin, Maximilian
name: Rennoch, Axel
name: Roscher, Karsten
name: Sperl, Philip
name: Usländer, Thomas
name: Weicken, Eva
name: Wrobel, Stefan
name: Zidowitz, Stephan
name: Ziehn, Jens
name: Kläs, Michael
name: Cheng, Chih-Hong
name: Heinrich, Jana
name: Knoblauch, Dorian
name: Heidrich, Jens
name: Görge, Rebekka
name: Kolomiichuk, Sergii
name: Lämmel, Philipp
name: Plinge, Axel
name: Rauh, Lukas
name: Tcholtchev, Nikolay Vassilev
Publisher: name: Fraunhofer-Gesellschaft
Year: 2022

description: Im Auftrag des Bundesministeriums für Wirtschaft und Klimaschutz haben DIN und DKE im Januar 2022 die Arbeiten an der zweiten Ausgabe der Deutschen Normungsroadmap Künstliche Intelligenz gestartet. In einem breiten Beteiligungsprozess und unter Mitwirkung von mehr als 570 Fachleuten aus Wirtschaft, Wissenschaft, öffentlicher Hand und Zivilgesellschaft wurde damit der strategische Fahrplan für die KI-Normung weiterentwickelt. Koordiniert und begleitet wurden diese Arbeiten von einer hochrangigen Koordinierungsgruppe für KI-Normung und -Konformität. Mit der Normungsroadmap wird eine Maßnahme der KI-Strategie der Bundesregierung umgesetzt und damit ein wesentlicher Beitrag zur "KI - Made in Germany" geleistet. Die Normung ist Teil der KI-Strategie und ein strategisches Instrument zur Stärkung der Innovations- und Wettbewerbsfähigkeit der deutschen und europäischen Wirtschaft. Nicht zuletzt deshalb spielt sie im geplanten europäischen Rechtsrahmen für KI, dem Artificial Intelligence Act, eine besondere Rolle. Die vorliegende Normungsroadmap KI zeigt die Erfordernisse in der Normung auf, formuliert konkrete Empfehlungen und schafft so die Basis, um frühzeitig Normungsarbeiten auf nationaler, insbesondere aber auch auf europäischer und internationaler Ebene, anzustoßen. Damit zahlt sie maßgeblich auf den Artificial Intelligence Act der Europäischen Kommission ein und unterstützt dessen Umsetzung.
Deciphering molecular mechanism behind conformational change of the São Paolo metallo-β-lactamase 1 by using enhanced sampling
Creators: name: Chen, Jianzhong
name: Wang, Jinan
name: Pang, Laixue
name: Wang, Wei
name: Zhao, Juan
name: Zhu, Weiliang
Publisher: name: Taylor & Francis
Year: 2019
Subjects: Biophysics
Biochemistry
Physical Sciences not elsewhere classified
Cell Biology
Pharmacology
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Virology
Computational Biology

description: The São Paolo metallo-β-lactamase-1 (SPM-1) plays an important role in drug resistance of β-lactam antibiotics and bindings of zinc ions produce significant effect on the conformations of SPM-1. Thus, it is of significance for understanding function of SPM-1 to probe the conformational changes of SPM-1 induced by bindings of zinc ions. Because replica-exchange molecular dynamics (REMD) simulations can efficiently improve conformational samplings of proteins, REMD and normal mode analysis (NMA) were performed on three systems, including SPM-1 with non-zinc ions, single zinc ion and double zinc ions, to decipher molecular mechanism of conformational changes for SPM-1. The results suggest that binding of double zinc ions induces a closed state of SPM-1, while SPM-1 with binding of non-zinc and single zinc ion mainly exists as an open conformation. The analysis of interaction network between residues was carried out by using the program Ring 2.0. The results show that binding of double zinc ions highly enhances the stability of the π-π interaction network consisting of F60, Y61, F82, F152, Y153 and Y226, two hydrogen bonds between E83 and R161 as well as the salt bridge interaction between E151 and K159 compared to the SPM-1 with non-zinc or single zinc ion, which better stabilizes the closed conformation of SPM-1. Thus, the closed conformation of SPM-1 induced by bindings of double zinc ions is important in catalysis and determining inhibitor selectivity. Meanwhile, this work may provide useful theoretical hints for design of potent inhibitors toward drug resistance of β-lactam antibiotics. Communicated by Ramaswamy H. Sarma.
Learning to Generate Training Datasets for Robust Semantic Segmentation
Creators: name: Hariat, Marwane
name: Laurent, Olivier
name: Kazmierczak, Rémi
name: Zhang, Shihao
name: Bursuc, Andrei
name: Yao, Angela
name: Franchi, Gianni
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Semantic segmentation methods have advanced significantly. Still, their robustness to real-world perturbations and object types not seen during training remains a challenge, particularly in safety-critical applications. We propose a novel approach to improve the robustness of semantic segmentation techniques by leveraging the synergy between label-to-image generators and image-to-label segmentation models. Specifically, we design Robusta, a novel robust conditional generative adversarial network to generate realistic and plausible perturbed images that can be used to train reliable segmentation models. We conduct in-depth studies of the proposed generative model, assess the performance and robustness of the downstream segmentation network, and demonstrate that our approach can significantly enhance the robustness in the face of real-world perturbations, distribution shifts, and out-of-distribution samples. Our results suggest that this approach could be valuable in safety-critical applications, where the reliability of perception modules such as semantic segmentation is of utmost importance and comes with a limited computational budget in inference. We release our code at https://github.com/ENSTA-U2IS-AI/robusta.
description: Published as a conference paper at WACV 2024
Enhancing the hunt for new phenomena in dijet final-states using anomaly detection filters at the High-Luminosity Large Hadron Collider
Creators: name: Chekanov, Sergei V.
name: Zhang, Rui
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the realm of dijet searches in high-energy physics, a significant challenge has emerged: with experiments producing more and more data, the traditional methods of using analytic functions to describe dijet mass spectra start to fail. To address this, we suggest the application of an anomaly detection approach to eliminate less interesting background events based on event final states. This method not only bypasses the limitations of conventional background models but also significantly enhances our ability to detect potential signals of new physics. Through simulations that mimic the conditions of the upcoming High-Luminosity Large Hadron Collider, we demonstrate the strength and efficiency of this approach in dealing with large data volumes. The integration of unsupervised machine learning into our experimental framework paves the way for a promising avenue to unveil hidden physics discoveries within the overwhelming influx of data.
description: 14 pages, 9 figures, 1 table