cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Automatic Variationally Stable Analysis for Finite Element Computations: Transient Convection-Diffusion Problems
Creators: name: Valseth, Eirik
name: Behnoudfar, Pouria
name: Dawson, Clint
name: Romkes, Albert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M60 65M12 65M20 65M50

description: We establish stable finite element (FE) approximations of convection-diffusion initial boundary value problems using the automatic variationally stable finite element (AVS-FE) method. The transient convection-diffusion problem leads to issues in classical FE methods as the differential operator can be considered singular perturbation in both space and time. The unconditional stability of the AVS-FE method, regardless of the underlying differential operator, allows us significant flexibility in the construction of FE approximations. We take two distinct approaches to the FE discretization of the convection-diffusion problem: i) considering a space-time approach in which the temporal discretization is established using finite elements, and ii) a method of lines approach in which we employ the AVS-FE method in space whereas the temporal domain is discretized using the generalized-alpha method. In the generalized-alpha method, we discretize the temporal domain into finite sized time-steps and adopt the generalized-alpha method as time integrator. Then, we derive a corresponding norm for the obtained operator to guarantee the temporal stability of the method.
 We present numerical verifications for both approaches, including numerical asymptotic convergence studies highlighting optimal convergence properties. Furthermore, in the spirit of the discontinuous Petrov-Galerkin method by Demkowicz and Gopalakrishnan, the AVS-FE method also leads to readily available a posteriori error estimates through a Riesz representer of the residual of the AVS-FE approximations. Hence, the norm of the resulting local restrictions of these estimates serve as error indicators in both space and time for which we present multiple numerical verifications adaptive strategies.
Invariant Functions On Cluster Ensembles
Creators: name: Kaufman, Dani
Publisher: name: arXiv
Year: 2020
Subjects: subject: Commutative Algebra (math.AC)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13F60 (Primary) 30F60 (Secondary)

description: We define the notion of an invariant function on a cluster ensemble with respect to an action of the cluster modular group on its associated function fields. We realize many examples of previously studied functions as elements of this type of invariant ring and give many new examples. We show that these invariants have geometric and number theoretic interpretations, and classify them for ensembles associated to affine Dynkin diagrams.
description: 26 pages, 16 figures
Redshift indicators for gamma-ray bursts
Creators: name: Atteia, J-L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The measure of the distances and luminosities of gamma-ray bursts (GRBs) led to the discovery that many GRB properties are strongly correlated with their intrinsic luminosity, leading to the construction of reliable luminosity indicators. These GRB luminosity indicators have quickly found applications, like the construction of 'pseudo-redshifts', or the measure of luminosity distances, which can be computed independently of the measure of the redshift. In this contribution I discuss various issues connected with the construction of luminosity-redshift indicators for gamma-ray bursts.
description: 6 pages, 1 figure, Sollicited contribution at the 4th Workshop Gamma-Ray Bursts in the Afterglow Era, Rome,18-22 October 2004. Editors: L. Piro, L. Amati, S. Covino, and B. Gendre. Il Nuovo Cimento, in press
Study of SiO2-PbO-CdO-Ga2O3 glass system for mid infrared optical elements
Creators: name: Forestier, Xavier
name: Cimek, Jarosław
name: Kujawa, Ireneusz
name: Kasztelanic, Rafał
name: Pysz, Dariusz
name: Orliński, Krzysztof
name: Stępień, Ryszard
name: Buczyński, Ryszard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Glasses based on SiO2-PbO-CdO-Ga2O3 system have been studied for the first time for fabrication of mid-infrared optical elements. Gallium oxide concentration was gradually increased, replacing silicon dioxide, for different cadmium and lead oxide content. The thermal and optical properties were investigated for different compositions. It was observed that the thermal stability, refractive index, and the transmission in the infrared range increased with increase of gallium and lead concentrations. The most thermally stable glass composition was selected for fabrication of optical elements such as optical fibers. We also successfully fabricated mid-infrared lenses by hot embossing for potential application in compact gas detectors
Piot, Ant. & Co
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1823

description: Ort: Neapel
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Modulo:Politiche Comunitarie sulla Ricerca
Creators: name: Cutroni, Licia
Publisher: name: Zenodo
Year: 2019

description: Modulo Didattico "Politiche Comunitarie sulla Ricerca" presentato all'interno del progetto SPIDEr - Strategies for Planning and Integrated DEvelopment of Urban Cultural Contexts, finanziato dalla regione Sicilia, nell’ambito del Programma Operativo Fondo Sociale Europeo (PO FSE Sicilia 2014/2020) in risposta all’Avviso n. 11/2017 “Rafforzare l’occupabilità nel sistema della R&S e la nascita di Spin off di ricerca in Sicilia”.
Rapidly adapting robot swarms with Swarm Map-based Bayesian Optimisation
Creators: name: Bossens, David M.
name: Tarapore, Danesh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Multiagent Systems (cs.MA)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Rapid performance recovery from unforeseen environmental perturbations remains a grand challenge in swarm robotics. To solve this challenge, we investigate a behaviour adaptation approach, where one searches an archive of controllers for potential recovery solutions. To apply behaviour adaptation in swarm robotic systems, we propose two algorithms: (i) Swarm Map-based Optimisation (SMBO), which selects and evaluates one controller at a time, for a homogeneous swarm, in a centralised fashion; and (ii) Swarm Map-based Optimisation Decentralised (SMBO-Dec), which performs an asynchronous batch-based Bayesian optimisation to simultaneously explore different controllers for groups of robots in the swarm. We set up foraging experiments with a variety of disturbances: injected faults to proximity sensors, ground sensors, and the actuators of individual robots, with 100 unique combinations for each type. We also investigate disturbances in the operating environment of the swarm, where the swarm has to adapt to drastic changes in the number of resources available in the environment, and to one of the robots behaving disruptively towards the rest of the swarm, with 30 unique conditions for each such perturbation. The viability of SMBO and SMBO-Dec is demonstrated, comparing favourably to variants of random search and gradient descent, and various ablations, and improving performance up to 80% compared to the performance at the time of fault injection within at most 30 evaluations.
Supershell structure in trapped dilute Fermi gases
Creators: name: Yu, Y.
name: Ogren, M.
name: Aberg, S.
name: Reimann, S. M.
name: Brack, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that a dilute harmonically trapped two-component gas of fermionic atoms with a weak repulsive interaction has a pronounced super-shell structure: the shell fillings due to the spherical harmonic trapping potential are modulated by a beat mode. This changes the ``magic numbers'' occurring between the beat nodes by half a period. The length and amplitude of this beating mode depend on the strength of the interaction. We give a simple interpretation of the beat structure in terms of a semiclassical trace formula for the symmetry breaking U(3) --> SO(3).
description: 4 pages, 4 figures; In version 2, references added. The semiclassical explanation of super-shell structure is refined. Version 3, as appeared in Phys. Rev. A
Assignment of Freight Traffic in a Large-Scale Intermodal Network under Uncertainty
Creators: name: Uddin, Majbah
name: Huynh, Nathan
name: Ahmed, Fahim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper presents a methodology for freight traffic assignment in a large-scale road-rail intermodal network under uncertainty. Network uncertainties caused by natural disasters have dramatically increased in recent years. Several of these disasters (e.g., Hurricane Sandy, Mississippi River Flooding, and Hurricane Harvey) severely disrupted the U.S. freight transportation network, and consequently, the supply chain. To account for these network uncertainties, a stochastic freight traffic assignment model is formulated. An algorithmic framework, involving the sample average approximation and gradient projection algorithm, is proposed to solve this challenging problem. The developed methodology is tested on the U.S. intermodal network with freight flow data from the Freight Analysis Framework. The experiments consider three types of natural disasters that have different risks and impacts on transportation networks: earthquakes, hurricanes, and floods. It is found that for all disaster scenarios, freight ton-miles are higher compared to the base case without uncertainty. The increase in freight ton-miles is the highest under the flooding scenario; this is because there are more states in the flood-risk areas, and they are scattered throughout the U.S.
Wieland (-Weis), -Schweighauser, J. H., Bürgermeister
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Basel
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
ONLINE LEARNING APPROACHES FOR ANOMALY DETECTION IN CONTINUOUS DATA STREAMS
Creators: name: Puttkammer, Gregg D
name: Ward, Mark Daniel
name: A. Craig, Bruce
name: Gleich, David
Publisher: name: Purdue University Graduate School
Year: 2025
Subjects: classificationCode: 490501
subject: Applied statistics
classificationCode: 460299
subject: Artificial intelligence not elsewhere classified
classificationCode: 460511
subject: Stream and sensor data
classificationCode: 461199
subject: Machine learning not elsewhere classified

description: Anomaly detection is the act of identifying events that deviate from what is normal or expected behavior in a system. Traditional anomaly detection methods are often not suitable for the increasingly complex task of anomaly detection in modern systems. Today’s ever-increasing amount of high-velocity and dynamic data requires new methods to ensure that unknown events can be quickly detected, especially in critical infrastructure systems. This research explores online machine learning, where models learn incrementally as data arrive in real time. We demonstrate that online machine learning models reduce the need for labeled data and lower the computational burden often required in traditional batch learning, all while maintaining comparable accuracy. One drawback of using online machine learning models is that they struggle to capture larger trends in the data and do not align well with the traditional train-test split often used in machine learning environments. We explore several different testing environments in which online machine learning models can be applied. We also demonstrate that when applying online machine learning models without pretraining, the online models achieve comparable performance metrics to batch models, all while requiring as little as 1% of the total labeled data needed for traditional machine learning models.
Wenk, Martin, de Martin
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Basel
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Wendelin, St., chevalier de
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Belfort
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Wolff & Dreyfus
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Saarbrücken
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Petrov Type, Principal Null Directions, and Killing Tensors of Slowly-Rotating Black Holes in Quadratic Gravity
Creators: name: Owen, Caroline B.
name: Yunes, Nicolás
name: Witek, Helvi
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The ability to test general relativity in extreme gravity regimes using gravitational wave observations from current ground-based or future space-based detectors motivates the mathematical study of the symmetries of black holes in modified theories of gravity. In this paper we focus on spinning black hole solutions in two quadratic gravity theories: dynamical Chern-Simons and scalar Gauss-Bonnet gravity. We compute the principal null directions, Weyl scalars, and complex null tetrad in the small-coupling, slow rotation approximation for both theories, confirming that both spacetimes are Petrov type I. Additionally, we solve the Killing equation through rank 6 in dynamical Chern-Simons gravity and rank 2 in scalar Gauss-Bonnet gravity, showing that there is no nontrivial Killing tensor through those ranks for each theory. We therefore conjecture that the still-unknown, exact, quadratic-gravity, black-hole solutions do not possess a fourth constant of motion.
description: 23 pages, 2 figures, reuploaded on 01/04/24 to correct small typo in Eq (C5)
Multi-stage Attention ResU-Net for Semantic Segmentation of Fine-Resolution Remote Sensing Images
Creators: name: Li, Rui
name: Zheng, Shunyi
name: Duan, Chenxi
name: Su, Jianlin
name: Zhang, Ce
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The attention mechanism can refine the extracted feature maps and boost the classification performance of the deep network, which has become an essential technique in computer vision and natural language processing. However, the memory and computational costs of the dot-product attention mechanism increase quadratically with the spatio-temporal size of the input. Such growth hinders the usage of attention mechanisms considerably in application scenarios with large-scale inputs. In this Letter, we propose a Linear Attention Mechanism (LAM) to address this issue, which is approximately equivalent to dot-product attention with computational efficiency. Such a design makes the incorporation between attention mechanisms and deep networks much more flexible and versatile. Based on the proposed LAM, we re-factor the skip connections in the raw U-Net and design a Multi-stage Attention ResU-Net (MAResU-Net) for semantic segmentation from fine-resolution remote sensing images. Experiments conducted on the Vaihingen dataset demonstrated the effectiveness and efficiency of our MAResU-Net. Open-source code is available at https://github.com/lironui/Multistage-Attention-ResU-Net.
description: arXiv admin note: substantial text overlap with arXiv:2007.14902, arXiv:2009.02130
The 2-Deligne Tensor Product
Creators: name: Décoppet, Thibault D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 18M20, 18N25 (Primary), 18M05, 18N10 (Secondary)

description: We prove that the 2-Deligne tensor product of two compact semisimple 2-categories exists. Further, under suitable hypotheses, we explain how to describe the $Hom$-categories, connected components, and simple objects of a 2-Deligne tensor product. Finally, we prove that the 2-Deligne tensor product of two compact semisimple tensor 2-categories is a compact semisimple tensor 2-category.
Weak localization of short pulses in disordered waveguides
Creators: name: Skipetrov, S. E.
name: van Tiggelen, B. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider the phenomenon of weak localization of a short wave pulse in a quasi-1D disordered waveguide. We show that the long-time decay of the average transmission coefficient is not purely exponential, in contradiction with predictions of the diffusion theory. The diffusion theory breaks down completely for times exceeding the Heisenberg time. We also study the survival probability of a quantum particle in a disordered waveguide and compare our results with previous calculations using the super-symmetric nonlinear sigma model.
description: 4 pages, to appear in Acta Phys. Pol. A (Proceedings of the 2nd Workshop on Quantum Chaos and Localization Phenomena, May 19-22, 2005, Warsaw)
Zuppinger, Siber & Co
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Bergamo
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Electrochemical synthesis and properties of CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na)
Creators: name: Motohashi, T.
name: Ono, T.
name: Katsumata, Y.
name: Kanno, R.
name: Karppinen, M.
name: Yamauchi, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Single-phase bulk samples of the "exotic" CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na), were successfully synthesized through electrochemical de-intercalation of Li from pristine LiCoO2 samples. The samples of pure CoO2 were found to be essentially oxygen stoichiometric and possess a hexagonal structure consisting of stacked triangular-lattice CoO2 layers only. The magnetism of CoO2 is featured with a temperature-independent susceptibility of the magnitude of 10-3 emu/mol Oe, being essentially identical to that of a Li-doped phase, Li0.12CoO2. It is most likely that the CoO2 phase is a Pauli-paramagnetic metal with itinerant electrons.
description: 12 pages, 3 figures
MINOT: Modeling the intracluster medium (non-)thermal content and observable prediction tools
Creators: name: Adam, R.
name: Goksu, H.
name: Leingärtner-Goth, A.
name: Ettori, S.
name: Gnatyk, R.
name: Hnatyk, B.
name: Hütten, M.
name: Pérez-Romero, J.
name: Sánchez-Conde, M. A.
name: Sergijenko, O.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In the past decade, the observations of diffuse radio synchrotron emission toward galaxy clusters revealed cosmic-ray (CR) electrons and magnetic fields on megaparsec scales. However, their origin remains poorly understood, and several models have been discussed in the literature. CR protons are also expected to accumulate during the formation of clusters and probably contribute to the production of these high-energy electrons. In order to understand the physics of CRs in clusters, combining of observations at various wavelengths is particularly relevant. The exploitation of such data requires using a self-consistent approach including both the thermal and the nonthermal components, so that it is capable of predicting observables associated with the multiwavelength probes at play, in particular in the radio, millimeter, X-ray, and gamma-ray bands. We develop and describe such a self-consistent modeling framework, called MINOT (modeling the intracluster medium (non-)thermal content and observable prediction tools) and make this tool available to the community. The multiwavelength observables are computed based on the relevant physical process, according to the cluster location, and based on the sampling defined by the user. We describe the implementation of MINOT and how to use it. We also discuss the different assumptions and approximations that are involved and provide various examples regarding the production of output products at different wavelengths. As an illustration, we model the clusters A1795, A2142, and A2255 and compare the MINOT predictions to literature data. MINOT can be used to model the cluster thermal and nonthermal physical processes for a wide variety of datasets in the radio, millimeter, X-ray, and gamma-ray bands, as well as the neutrino emission. [abridged]
description: 24 pages, accepted in A&A, code available at https://github.com/remi-adam/minot
Fast Regression of the Tritium Breeding Ratio in Fusion Reactors
Creators: name: Mánek, Petr
name: Van Goffrier, Graham
name: Gopakumar, Vignesh
name: Nikolaou, Nikolaos
name: Shimwell, Jonathan
name: Waldmann, Ingo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The tritium breeding ratio (TBR) is an essential quantity for the design of modern and next-generation D-T fueled nuclear fusion reactors. Representing the ratio between tritium fuel generated in breeding blankets and fuel consumed during reactor runtime, the TBR depends on reactor geometry and material properties in a complex manner. In this work, we explored the training of surrogate models to produce a cheap but high-quality approximation for a Monte Carlo TBR model in use at the UK Atomic Energy Authority. We investigated possibilities for dimensional reduction of its feature space, reviewed 9 families of surrogate models for potential applicability, and performed hyperparameter optimisation. Here we present the performance and scaling properties of these models, the fastest of which, an artificial neural network, demonstrated $R^2=0.985$ and a mean prediction time of $0.898\ μ\mathrm{s}$, representing a relative speedup of $8\cdot 10^6$ with respect to the expensive MC model. We further present a novel adaptive sampling algorithm, Quality-Adaptive Surrogate Sampling, capable of interfacing with any of the individually studied surrogates. Our preliminary testing on a toy TBR theory has demonstrated the efficacy of this algorithm for accelerating the surrogate modelling process.
description: 13 pages, 8 figures
Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films
Creators: name: Despont, L.
name: Lichtensteiger, C.
name: Koitzsch, C.
name: Clerc, C.
name: Garnier, M. G.
name: de Abajo, F. J. Garcia
name: Bousquet, E.
name: Ghosez, Ph.
name: Triscone, J. -M.
name: Aebi, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: X-ray photoelectron diffraction is used to directly probe the intra-cell polar atomic distortion and tetragonality associated with ferroelectricity in ultrathin epitaxial PbTiO3 films. Our measurements, combined with ab-initio calculations, unambiguously demonstrate non-centro-symmetry in films a few unit cells thick, imply that films as thin as 3 unit cells still preserve a ferroelectric polar distortion, and also show that there is no thick paraelectric dead layer at the surface.
Peyer & von Mandach
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1823

description: Ort: Schaffhausen
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Photochromic response of encapsulated oxygen-containing yttrium hydride thin films
Creators: name: Moro, Marcos V.
name: Aðalsteinsson, Sigurbjörn M.
name: Tran, Tuan. T.
name: Moldarev, Dmitrii
name: Samanta, Ayan
name: Wolff, Max
name: Primetzhofer, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Photochromic oxygen$-$containing yttrium$-$hydride thin films are synthesized by argon$-$magnetron sputtering on microscope slides. Some of them are encapsulated with a thin, transparent and non$-$photochromic diffusion-barrier layer of either Al2O3 or Si3N4. Ion beam-based methods prove that these protective diffusion barriers are stable and free from pinholes, with thicknesses of only a few tens of nanometers. Optical spectrophotometry reveals that the photochromic response and relaxation time for both $-$ protected and unprotected $-$ samples are almost identical. Ageing effects in the unprotected films lead to degradation of the photochromic performance (self$-$delamination) while the photochromic response for the encapsulated films is stable. Our results show that the environment does not play a decisive role for the photochromic process and encapsulation of oxygen containing rare-earth hydride films with transparent and non-organic thin diffusion barrier layers provides long-time stability of the films, mandatory for applications as photochromic coatings on e.g., smart windows.
A Lightweight Privacy-Preserving Scheme Using Label-based Pixel Block Mixing for Image Classification in Deep Learning
Creators: name: Xiang, Yuexin
name: Li, Tiantian
name: Ren, Wei
name: Zhu, Tianqing
name: Choo, Kim-Kwang Raymond
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: I.2.6; I.2.9
subject: 68T07

description: To ensure the privacy of sensitive data used in the training of deep learning models, a number of privacy-preserving methods have been designed by the research community. However, existing schemes are generally designed to work with textual data, or are not efficient when a large number of images is used for training. Hence, in this paper we propose a lightweight and efficient approach to preserve image privacy while maintaining the availability of the training set. Specifically, we design the pixel block mixing algorithm for image classification privacy preservation in deep learning. To evaluate its utility, we use the mixed training set to train the ResNet50, VGG16, InceptionV3 and DenseNet121 models on the WIKI dataset and the CNBC face dataset. Experimental findings on the testing set show that our scheme preserves image privacy while maintaining the availability of the training set in the deep learning models. Additionally, the experimental results demonstrate that we achieve good performance for the VGG16 model on the WIKI dataset and both ResNet50 and DenseNet121 on the CNBC dataset. The pixel block algorithm achieves fairly high efficiency in the mixing of the images, and it is computationally challenging for the attackers to restore the mixed training set to the original training set. Moreover, data augmentation can be applied to the mixed training set to improve the training's effectiveness.
description: 11 pages, 16 figures
Nonequilibrium Phase Transitions in Model Ferromagnets: A Review
Creators: name: Acharyya, Muktish
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The nonequilibrium dynamic phase transitions in ferromagnetic models (Ising, XY and Heisenberg) are reviewed on the basis of very recent work in this field.
description: Int. J. Mod. Phys. C (2005) (in press)
On the use of feature-maps and parameter control for improved quality-diversity meta-evolution
Creators: name: Bossens, David M.
name: Tarapore, Danesh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In Quality-Diversity (QD) algorithms, which evolve a behaviourally diverse archive of high-performing solutions, the behaviour space is a difficult design choice that should be tailored to the target application. In QD meta-evolution, one evolves a population of QD algorithms to optimise the behaviour space based on an archive-level objective, the meta-fitness. This paper proposes an improved meta-evolution system such that (i) the database used to rapidly populate new archives is reformulated to prevent loss of quality-diversity; (ii) the linear transformation of base-features is generalised to a feature-map, a function of the base-features parametrised by the meta-genotype; and (iii) the mutation rate of the QD algorithm and the number of generations per meta-generation are controlled dynamically. Experiments on an 8-joint planar robot arm compare feature-maps (linear, non-linear, and feature-selection), parameter control strategies (static, endogenous, reinforcement learning, and annealing), and traditional MAP-Elites variants, for a total of 49 experimental conditions. Results reveal that non-linear and feature-selection feature-maps yield a 15-fold and 3-fold improvement in meta-fitness, respectively, over linear feature-maps. Reinforcement learning ranks among top parameter control methods. Finally, our approach allows the robot arm to recover a reach of over 80% for most damages and at least 60% for severe damages.
description: extended version of GECCO'21 paper
Ziegler
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Karlsruhe
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
An economic analysis of the property/casualty insurance market
Creators: name: Kelly, Mary Virginia
Publisher: name: University of British Columbia
Year: 2009

description: Three economic issues in property/casualty insurance are examined in this thesis. Chapter 2 explores the impact of supply side heterogeneity on the market equilibrium. Multiple period contracting and informational issues are examined in Chapters 3 and 4. Property/casualty insurance is marketed in two manners: through agency writers and direct writers. Direct writers can sell insurance at a lower cost than agency writers. By exploiting demand side characteristics, Chapter 2 extends the traditional literature by examining the behaviour of heterogeneous insurers within a framework that admits both direct and agency writers in equilibrium. Heterogeneous travel costs are used to support this equilibrium. A second model is developed in which claim frequency heterogeneity is introduced on the demand side. It is assumed that agency writers can better discern a consumer's risk type. Characteristics of equilibria under which direct and agency writers exist are derived. In Chapter 3, Rothschild and Stiglitz's (1976) single period insurance model is extended to multiple periods. In a multiple period framework, insurers offer a sequence of single period contracts in which future contracts are conditioned on past contract choices. For dynamic consistency, once low risks have revealed their type, future contracts must be contingent on this event. This contract structure is compared to both a sequence of one period pooling contracts and a sequence of one period separating contracts. Numerical examples illustrate the results. In Chapter 4, learning by insurers is examined in a model in which consumers possess search costs. The presence of search costs allows inefficient insurers to remain in the market, and allows lower cost firms to earn higher profit loadings each period. Insurers, who possess differing initial valuations of a consumer's loss propensity, update the contract offered each period based on a consumer's past accident history. In a multiple period setting, consumers search for new coverage and switch insurers when the price charged by their contracting insurer exceeds the price that they are willing to pay.
title: Ξενία Παλιουρίου - Φιλοξενία, Τόπος και Τοπίο
title: Xenia Paliouri – Philoxenia, Locus and Landscape
titleType: AlternativeTitle
Creators: name: Ντάγκαλα, Μεβλέν
name: Ορφανού, Μαρία
name: Σαμαράς, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Ξενία
Φιλοξενία
Τόπος
Τοπίο
Ελληνικός Οργανισμός Τουρισμού
ΕΟΤ
Μονάδες φιλοξενίας
Μοτέλ Ξενία Παλιουρίου
Χαλκιδική
Παλιούρι
Επανασχεδιασμός

description: Η πτυχιακή εργασία εστιάζει στον επανασχεδιασμό του Μοτέλ Ξενία στο Παλιούρι Χαλκιδικής, έργο του αρχιτέκτονα Α. Κωνσταντινίδη, που ολοκληρώθηκε το 1962. Πρόκειται για ένα κτιριακό συγκρότημα στην ακτή Χρούσου, το οποίο στεγάζει χώρους υποδοχής και αποθήκευσης, εστιατόριο, κλίνες και υποδομές στάθμευσης αυτοκινήτων. Η πρόταση αφορά την μετατροπή του μοτέλ σε σύγχρονο ξενοδοχειακό κατάλυμα με σεβασμό στην ιστορία του κτιρίου και στις αρχές του Α. Κωνσταντινίδη. Οι έννοιες, όπως το φως, η θάλασσα, ο τόπος, το τοπίο καθώς και ο κάνναβος λειτουργούν ως αρωγοί στην εκπόνηση της μελέτης.
Zeller, Inspector
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Beuggen / Baden
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Ancilla-Assisted Protection of Information: Application to Atom-Cavity Systems
Creators: name: Gangwar, Rajeev
name: Bera, Mohit Lal
name: Teja, G. P.
name: Goyal, Sandeep K.
name: Bera, Manabendra Nath
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: One of the major obstacles faced by quantum-enabled technology is the environmental noise that causes decoherence in the quantum system, thereby destroying much of its quantum aspects and introducing errors while the system undergoes quantum operations and processing. A number of techniques have been invented to mitigate the environmental effects, and many of these techniques are specific to the environment and the quantum tasks at hand. Here, we propose a protocol that makes arbitrary environments effectively noise-free or transparent using an ancilla, which, in particular, is well suited to protect information stored in atoms. The ancilla, which is the photons, is allowed to undergo restricted but a wide class of noisy operations. The protocol transfers the information of the system onto the decoherence-free subspace and later retrieves it back to the system. Consequently, it enables full protection of quantum information and entanglement in the atomic system from decoherence. We propose experimental schemes to implement this protocol on atomic systems in an optical cavity.
description: Accepted for publication in Quantum Information Processing (2023)
The Real-Time Evolution of Sakurai's Star (V4334 Sgr) and other (V)LTP Objects
Creators: name: van Hoof, P. A. M.
name: Bryce, M.
name: Evans, A.
name: Eyres, S. P. S.
name: Hajduk, M.
name: Herwig, F.
name: Kerber, F.
name: Kimeswenger, S.
name: Lopez, J. A.
name: Matsuura, M.
name: Pollacco, D. L.
name: Van de Steene, G. C.
name: Zijlstra, A. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the progress of our on-going campaign to monitor the evolution of the VLTP objects V4334 Sgr and V605 Aql, as well as the suspected (V)LTP object CK Vul. V4334 Sgr does not show signs of increased ionization compared to our previous observations in 2004. We obtained the first radio detection of V605 Aql, indicating a strong increase in radio flux since 1987. We also present the first radio detection of CK Vul and discuss the expansion of the material ejected during the 1670 event.
description: 4 pages, 2 figures in eps format, IAU symp. 234: `Planetary Nebulae in our Galaxy and Beyond', eds. M. J. Barlow & R. H. Mendez
Anime and affect: professional fandom and the Youtube platform in the age of monetization
Creators: name: Kellett, Zackary
Publisher: name: No Publisher Supplied
Year: 2021

description: Over the past few decades, scholars of fan studies have been engaged with questions of capital and consumerism in fandom— with writers such as Henry Jenkins and his canonical Textual Poachers investigating the ways in which fan-production can challenge or critique existing capitalist structures and modes of consumption, and later scholars such as Matt Hills identifying those challenges as being paradoxically implicated in those structures by nature in his book Fan Cultures. As fandom increasingly relocates itself into the digital world, with its ability to connect individuals and share creations across geographical borders— and more importantly, its potential to monetize that connection— those questions of fandom and capital become increasingly important to discuss. Given the high concentration of affect present within fan communities, an analysis of the process by which online platforms influence the affective relationships of fandom will serve as an important barometer for future studies of other online communities as well. As such, I have chosen to analyze the professionalization of anime fans within the YouTube platform via a hybrid approach of ethnographical and archival analysis. This approach includes textual readings of fan-created content uploaded to the YouTube platform, personal interviews conducted with fan-creators active within the anime community on the platform, and a chronographic analysis of changes to YouTube’s structure and conventions over time— with focus on social, legal, and monetary policies in particular. In this thesis, I argue that the conventions of the YouTube platform, such as its subscriber and ad-revenue systems, simultaneously lend themselves to the core affective drives of anime fandom, while necessarily implicating fan-creators and fan-viewers in a more calculative form of play than previous forms of fandom— functioning to transmute subcultural and social capital into economic capital at an unprecedented scale. However, this also maintains that while the introduction of financial incentive does complicate the affective relationships of fans on the platform, the pressures those incentives exert on fans ultimately fail to replace affect as the core motivational force behind the majority of fan activity on the YouTube platform.
Carbon Nanomaterials to Combat Virus: A perspective in view of COVID-19
Creators: name: Sengupta, Joydip
name: Hussain, Chaudhery Mustansar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The rapid outbreaks of lethal viruses necessitate the development of novel antiviral substance. Besides the conventional antiviral substances, biocompatible nanomaterials also have significant potential in combating the virus at various stages of infection. Carbon nanomaterials have an impressive record against viruses and can deal with many crucial healthcare issues. In accordance with the published literature, biocompatible carbon nanomaterials have a promising prospect as an antiviral substance. Subsequently, the antiviral properties of different carbon nanomaterials namely fullerene, carbon nanotube, carbon dot and graphene oxide have been reviewed.
description: Keywords: Fullerene; Carbon nanotube; Carbon dot; Graphene oxide; Antiviral; COVID-19. Carbon Trends, 2020
Wegmann, Johannes
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Zürich
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
The Weyl bundle as a differentiable manifold
Creators: name: Tosiek, Jaromir
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 53C07;53D55

description: Construction of an infinite dimensional differentiable manifold ${\mathbb R}^{\infty}$ not modelled on any Banach space is proposed. Definition, metric and differential structures of a Weyl algebra and a Weyl algebra bundle are presented. Continuity of the $\circ$-product in the Tichonov topology is proved. Construction of the $*$-product of the Fedosov type in terms of theory of connection in a fibre bundle is explained.
description: 31 pages; revised version - some typoes have been eliminated, notation has been simplified
A New Approach to Probe Non-Standard Interactions in Atmospheric Neutrino Experiments
Creators: name: Kumar, Anil
name: Khatun, Amina
name: Agarwalla, Sanjib Kumar
name: Dighe, Amol
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We propose a new approach to explore the neutral-current non-standard neutrino interactions (NSI) in atmospheric neutrino experiments using oscillation dips and valleys in reconstructed muon observables, at a detector like ICAL that can identify the muon charge. We focus on the flavor-changing NSI parameter $\varepsilon_{μτ}$, which has the maximum impact on the muon survival probability in these experiments. We show that non-zero $\varepsilon_{μτ}$ shifts the oscillation dip locations in $L/E$ distributions of the up/down event ratios of reconstructed $μ^-$ and $μ^+$ in opposite directions. We introduce a new variable $Δd$ representing the difference of dip locations in $μ^-$ and $μ^+$, which is sensitive to the magnitude as well as the sign of $\varepsilon_{μτ}$, and is independent of the value of $Δm^2_{32}$. We further note that the oscillation valley in the ($E$, $\cos θ$) plane of the reconstructed muon observables bends in the presence of NSI, its curvature having opposite signs for $μ^-$ and $μ^+$. We demonstrate the identification of NSI with this curvature, which is feasible for detectors like ICAL having excellent muon energy and direction resolutions. We illustrate how the measurement of contrast in the curvatures of valleys in $μ^-$ and $μ^+$ can be used to estimate $\varepsilon_{μτ}$. Using these proposed oscillation dip and valley measurements, the achievable precision on $|\varepsilon_{μτ}|$ at 90% C.L. is about 2% with 500 kt$\cdot$yr exposure. The effects of statistical fluctuations, systematic errors, and uncertainties in oscillation parameters have been incorporated using multiple sets of simulated data. Our method would provide a direct and robust measurement of $\varepsilon_{μτ}$ in the multi-GeV energy range.
description: 30 pages, 11 figures, 4 tables. Published in JHEP. Matches with the published version
A Modular First Formalisation of Combinatorial Design Theory
Creators: name: Edmonds, Chelsea
name: Paulson, Lawrence
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Combinatorics (math.CO)
subject: Logic (math.LO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: F.4.1; G.2
subject: 05B05, 68V20, 68V35, 03B35

description: Combinatorial design theory studies set systems with certain balance and symmetry properties and has applications to computer science and elsewhere. This paper presents a modular approach to formalising designs for the first time using Isabelle and assesses the usability of a locale-centric approach to formalisations of mathematical structures. We demonstrate how locales can be used to specify numerous types of designs and their hierarchy. The resulting library, which is concise and adaptable, includes formal definitions and proofs for many key properties, operations, and theorems on the construction and existence of designs.
description: This paper has been accepted to CICM 2021. The full formalisation will be made available on the Isabelle AFP prior to the conference, and is alternatively available here: https://github.com/cledmonds/design-theory
Wernigh & Wunderlich
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1828

description: Ort: Frankfurt a. M.
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Finite-volume energy spectrum of the $K^-K^-K^-$ system
Creators: name: Alexandru, Andrei
name: Brett, Ruairí
name: Culver, Chris
name: Döring, Michael
name: Guo, Dehua
name: Lee, Frank X.
name: Mai, Maxim
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The dynamics of multi-kaon systems are of relevance for several areas of nuclear physics. However, even the simplest systems, two and three kaons, are hard to prepare and study experimentally. Here we show how to extract this information using first-principle lattice QCD results. We (1) extend the relativistic three-body quantization condition to the strangeness sector, predicting for the first time the excited level finite-volume spectrum of three kaon systems at maximal isospin, and (2) present a first lattice QCD calculation of the excited levels of this system in a finite box. We compare our predictions with the lattice results reported here and with previous ground state calculations and find very good agreement.
description: 9 pages, 3 figures; v2 -- typos corrected