cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Entangling ferrimagnetic magnons with an atomic ensemble via opto-magnomechanics
Creators: name: Fan, Zhi-Yuan
name: Qian, Hang
name: Zuo, Xuan
name: Li, Jie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show how to prepare macroscopic entanglement between an atomic ensemble and a large number of magnons in a ferrimagnetic YIG crystal. Specifically, we adopt an opto-magnomechanical configuration where the magnetostriction-induced magnomechanical displacement couples to an optical cavity via radiation pressure, and the latter further couples to an ensemble of two-level atoms that are placed inside the cavity. We show that by properly driving the cavity and magnon modes, optomechanical entanglement is created which is further distributed to the atomic and magnonic systems, yielding stationary entanglement between atoms and magnons. The atom-magnon entanglement is a result of the combined effect of opto- and magnomechanical cooling and optomechanical parametric down-conversion interactions. A competition mechanism between two mechanical cooling channels is revealed. We further show that genuine tripartite entanglement of three massive subsystems, i.e., atoms, magnons and phonons, can also be achieved in the same system. Our results indicate that the hybrid opto-magnomechanical system may become a promising system for preparing macroscopic quantum states involving magnons, photons, phonons and atoms.
A trapped-ion based quantum byte with $10^{-5}$ next-neighbour cross-talk
Creators: name: Piltz, Ch.
name: Sriarunothai, Th.
name: Varón, A. F.
name: Wunderlich, Ch.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The addressing of a particular qubit within a quantum register is a key prerequisite for scalable quantum computing. In general, executing a quantum gate with a single qubit, or a subset of qubits, affects the quantum states of all other qubits. This reduced fidelity of the whole quantum register could prevent the application of quantum error correction protocols and thus preclude scalability. We demonstrate addressing of individual qubits within a quantum byte (eight qubits) and measure the error induced in all non-addressed qubits (cross-talk) associated with the application of single-qubit gates. The quantum byte is implemented using microwave-driven hyperfine qubits of $^{171}$Yb$^+$ ions confined in a Paul trap augmented with a magnetic gradient field. The measured cross-talk is on the order of $10^{-5}$ and therefore below the threshold commonly agreed sufficient to efficiently realize fault-tolerant quantum computing. Hence, our results demonstrate how this threshold can be overcome with respect to cross-talk.
description: 13 pages, 5 figures Version 2: Some parts of the text have been rephrased and provide more detail. One figure and additional references have been added. Version 2 of this preprint is similar to the published version
Quantum-Enhanced Topological Data Analysis: A Peep from an Implementation Perspective
Creators: name: Khandelwal, Ankit
name: Chandra, M Girish
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: There is heightened interest in quantum algorithms for Topological Data Analysis (TDA) as it is a powerful tool for data analysis, but it can get highly computationally expensive. Even though there are different propositions and observations for Quantum Topological Data Analysis (QTDA), the necessary details to implement them on software platforms are lacking. Towards closing this gap, the present paper presents an implementation of one such algorithm for calculating Betti numbers. The step-by-step instructions for the chosen quantum algorithm and the aspects of how it can be used for machine learning tasks are provided. We provide encouraging results on using Betti numbers for classification and give a preliminary analysis of the effect of the number of shots and precision qubits on the outcome of the quantum algorithm.
description: 10 pages, 7 figures, 1 table
VMAT – Planung bei Prostata-Karzinom: Erste Erfahrungen mit FFF-Beschleunigerdaten
Creators: name: Treutwein, Marius
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: VMAT, Volumetric Modulated Arc Therapy, Prostatakarzinom, Flatness Filter Free, FFF
subject: 530 Physik
subject: 610 Medizin

description: Die Präsentation stellt eine Planungsstudie mit 10 Plänen in VMAT - Technik für Patienten mit Prostatakarzinom jeweils für einen Beschleuniger mit Ausgleichsfilter (FF) und ohne Ausgleichsfilter (FFF) vor, Als signifikanter Unterschied erweist sich die Anzahl der Monitoreinheiten, die für FFF-Beschleuniger etwa 10% höher liegt als für FF-Beschleuniger.
description: Der Vortrag wurde anlässlich des Treffens der Regionalsektion Süd-Ost der Deutschen Gesellschaft für Medizinische Physik (DGMP) gehalten.
Accessing Insulin Pump Therapy by Adults with Type 1 Diabetes in Ireland. A Multiphase Mixed Methods Study.
Creators: name: Gajewska, Katarzyna
Publisher: name: Royal College of Surgeons in Ireland
Year: 2022
Subjects: subject: 110306 Endocrinology
subject: FOS: Clinical medicine
subject: 111706 Epidemiology
subject: FOS: Health sciences
subject: Health Care
subject: 111799 Public Health and Health Services not elsewhere classified

description: The overarching aim of this thesis was to explore the determinants of uptake and access to continuous subcutaneous insulin infusion (CSII) for adults with type 1 diabetes (T1D) in Ireland through a mixed methods multiphase study. Methods: To explore this complex phenomenon in depth, the thesis consisted of 4 main objectives, 3 studies and 1 synthesis of all evidence. Study 1 was a quantitative secondary data analysis utilizing prescription-based data to estimate (1a) the epidemiology of T1D and (1b) uptake of CSII in adults with T1D. Study 2 investigated the availability of CSII in Irish adult diabetes centres through a national survey of diabetes clinics. Study 3 explored barriers and facilitators to accessing CSII by adults through semi-structured interviews with Health-Care Professionals (HCP) and other key stakeholders (OKS), and focus groups with People with type 1 Diabetes (PwD) from areas of low, medium and high uptake of CSII. Sampling was informed by the results of Studies 1 and 2. Qualitative data were analysed using the Reflexive Thematic Analysis approach. Finally, all evidence was synthesized within the Pillar Integration Process mixed methods synthesis. Results: Studies 1 and 2 confirmed that the uptake of CSII is low in adults, and that there is inequality in access to CSII. Both uptake and availability of CSII are geographically heterogeneous. Study 3 explained the reasons for the diverse availability and uptake of CSII, and the synthesis summarized the determinants of access. These are: the impact of individual factors (either HCP or PwD, including their interest and personal characteristics, beliefs and motivation); capacity (mainly resources and expertise); structure (i.e. of the health-service – referrals, standardised pathways); awareness of CSII and its benefits; dwelling location; availability of CSII in local diabetes clinic(s); distance from and choice of clinic(s); health-services planning, access to and lessons from paediatric care and data monitoring (i.e. diabetes registry).Conclusion: This PhD thesis provides evidence on the determinants of access to CSII and can inform policy-makers, health-services planners, HCP and PwD in Ireland on the complexity of access to CSII, and a current gap in Irish diabetes care delivery.
A Unifying Framework for Measuring Weighted Rich Clubs
Creators: name: Alstott, Jeff
name: Panzarasa, Pietro
name: Rubinov, Mikail
name: Bullmore, Ed
name: Vertes, Petra
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Network analysis can help uncover meaningful regularities in the organization of complex systems. Among these, rich clubs are a functionally important property of a variety of social, technological and biological networks. Rich clubs emerge when nodes that are somehow prominent or 'rich' (e.g., highly connected) interact preferentially with one another. The identification of rich clubs is non-trivial, especially in weighted networks, and to this end multiple distinct metrics have been proposed. Here we describe a unifying framework for detecting rich clubs which intuitively generalizes various metrics into a single integrated method. This generalization rests upon the explicit incorporation of randomized control networks into the measurement process. We apply this framework to real-life examples, and show that, depending on the selection of randomized controls, different kinds of rich-club structures can be detected, such as topological and weighted rich clubs.
description: 6 pages, 3 figures
Secure MIMO Communications under Quantized Channel Feedback in the presence of Jamming
Creators: name: Tsiligkaridis, Theodoros
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider the problem of secure communications in a MIMO setting in the presence of an adversarial jammer equipped with $n_j$ transmit antennas and an eavesdropper equipped with $n_e$ receive antennas. A multiantenna transmitter, equipped with $n_t$ antennas, desires to secretly communicate a message to a multiantenna receiver equipped with $n_r$ antennas. We propose a transmission method based on artificial noise and linear precoding and a two-stage receiver method employing beamforming. Under this strategy, we first characterize the achievable secrecy rates of communication and prove that the achievable secure degrees-of-freedom (SDoF) is given by $d_s = n_r - n_j$ in the perfect channel state information (CSI) case. Second, we consider quantized CSI feedback using Grassmannian quantization of a function of the direct channel matrix and derive sufficient conditions for the quantization bit rate scaling as a function of transmit power for maintaining the achievable SDoF $d_s$ with perfect CSI and for having asymptotically zero secrecy rate loss due to quantization. Numerical simulations are also provided to support the theory.
description: 11 pages, IEEE Transactions on Signal Processing
Black hole radiation of spin-1 particles in (1+2) dimensions
Creators: name: Kruglov, S. I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The radiation of vector particles by black holes in (1+2) dimensions is investigated within the WKB approximation. We consider the process of quantum tunnelling of bosons through an event horizon of the black hole. The emission temperature for the Schwarzschild background geometry coincides with the Hawking temperature and for the Rindler spacetime the temperature is the Unruh temperature. We also obtain the radiation temperatures for the de Sitter spacetime.
description: 7 pages, no figures, journal version
Correlation factor for diffusion in cubic crystals with solute-vacancy interactions of arbitrary range
Creators: name: Bocquet, J. L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A formalism using a double Laplace Fourier transform of the transport equation yields the return probabilities of the vacancy in the vicinity of the tracer atom in the presence of solute-vacancy interactions of arbitrary extension. Studying model cases, it is shown that taking into account the full range of the interaction may change noticeably the correlation factor. The latter depends tightly on the pattern of migration barriers which is chosen to describe the vacancy jumps around the tracer atom. A thorough ab initio evaluation of all barriers is rarely available in the literature. It is shown that approximations often used to overcome this lack of information can be misleading. The examination of dilute systems recently studied shows that the interactions within the first three neighbour shells dictate the final value with a good precision. The main improvement of the modelling comes from dropping the restrictive assumption which impose an equal value to the jump frequencies leading to a dissociation of the solute-vacancy pair.
description: 45 pages; 8 figures
Creation of crystal structure reproducing X-ray diffraction pattern without using database
Creators: name: Lee, Joohwi
name: Oba, Junpei
name: Ohba, Nobuko
name: Kajita, Seiji
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: When a sample's X-ray diffraction pattern (XRD) is measured, the corresponding crystal structure is usually determined by searching for similar XRD patterns in the database. However, if a similar XRD pattern is not found, it is tremendously laborious to identify the crystal structure even for experts. This case commonly happens when researchers develop novel and complex materials. In this study, we propose a crystal structure creation scheme that reproduces a given XRD pattern. We employed a combinatorial inverse design method using an evolutionary algorithm and crystal morphing (Evolv&Morph) supported by Bayesian optimization, which maximizes the similarity of the XRD patterns between target one and those of the created crystal structures. For sixteen different crystal structure systems with twelve simulated and four powder target XRD patterns, Evolv&Morph successfully created crystal structures with the same XRD pattern as the target (cosine similarity > 99% for the simulated ones and > 96% the experimentally-measured ones). Furthermore, the present method has merits in that it is an automated crystal structure creation scheme, not dependent on a database. We believe that Evolv&Morph can be applied not only to determine crystal structures but also to design materials for specific properties.
description: 18 pages, 5 figures, 2 tables, published in npjCM
PseudoBound: Limiting the anomaly reconstruction capability of one-class classifiers using pseudo anomalies
Creators: name: Astrid, Marcella
name: Zaheer, Muhammad Zaigham
name: Lee, Seung-Ik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Due to the rarity of anomalous events, video anomaly detection is typically approached as one-class classification (OCC) problem. Typically in OCC, an autoencoder (AE) is trained to reconstruct the normal only training data with the expectation that, in test time, it can poorly reconstruct the anomalous data. However, previous studies have shown that, even trained with only normal data, AEs can often reconstruct anomalous data as well, resulting in a decreased performance. To mitigate this problem, we propose to limit the anomaly reconstruction capability of AEs by incorporating pseudo anomalies during the training of an AE. Extensive experiments using five types of pseudo anomalies show the robustness of our training mechanism towards any kind of pseudo anomaly. Moreover, we demonstrate the effectiveness of our proposed pseudo anomaly based training approach against several existing state-ofthe-art (SOTA) methods on three benchmark video anomaly datasets, outperforming all the other reconstruction-based approaches in two datasets and showing the second best performance in the other dataset.
Region-based approximation of probability distributions (for visibility between imprecise points among obstacles)
Creators: name: Buchin, Kevin
name: Kostitsyna, Irina
name: Löffler, Maarten
name: Silveira, Rodrigo I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: Let $p$ and $q$ be two imprecise points, given as probability density functions on $\mathbb R^2$, and let $\cal R$ be a set of $n$ line segments (obstacles) in $\mathbb R^2$. We study the problem of approximating the probability that $p$ and $q$ can see each other; that is, that the segment connecting $p$ and $q$ does not cross any segment of $\cal R$. To solve this problem, we approximate each density function by a weighted set of polygons; a novel approach to dealing with probability density functions in computational geometry.
On the Parameterized Complexity of Computing Balanced Partitions in Graphs
Creators: name: van Bevern, René
name: Feldmann, Andreas Emil
name: Sorge, Manuel
name: Suchý, Ondřej
Publisher: name: arXiv
Year: 2013
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Data Structures and Algorithms (cs.DS)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: G.2.1; G.2.2; I.1.2; F.2.2
subject: 05C85

description: A balanced partition is a clustering of a graph into a given number of equal-sized parts. For instance, the Bisection problem asks to remove at most k edges in order to partition the vertices into two equal-sized parts. We prove that Bisection is FPT for the distance to constant cliquewidth if we are given the deletion set. This implies FPT algorithms for some well-studied parameters such as cluster vertex deletion number and feedback vertex set. However, we show that Bisection does not admit polynomial-size kernels for these parameters. For the Vertex Bisection problem, vertices need to be removed in order to obtain two equal-sized parts. We show that this problem is FPT for the number of removed vertices k if the solution cuts the graph into a constant number c of connected components. The latter condition is unavoidable, since we also prove that Vertex Bisection is W[1]-hard w.r.t. (k,c). Our algorithms for finding bisections can easily be adapted to finding partitions into d equal-sized parts, which entails additional running time factors of n^{O(d)}. We show that a substantial speed-up is unlikely since the corresponding task is W[1]-hard w.r.t. d, even on forests of maximum degree two. We can, however, show that it is FPT for the vertex cover number.
description: This version of the article is to appear in Theory of Computing Systems
EC-SfM: Efficient Covisibility-based Structure-from-Motion for Both Sequential and Unordered Images
Creators: name: Ye, Zhichao
name: Bao, Chong
name: Zhou, Xin
name: Liu, Haomin
name: Bao, Hujun
name: Zhang, Guofeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Structure-from-Motion is a technology used to obtain scene structure through image collection, which is a fundamental problem in computer vision. For unordered Internet images, SfM is very slow due to the lack of prior knowledge about image overlap. For sequential images, knowing the large overlap between adjacent frames, SfM can adopt a variety of acceleration strategies, which are only applicable to sequential data. To further improve the reconstruction efficiency and break the gap of strategies between these two kinds of data, this paper presents an efficient covisibility-based incremental SfM. Different from previous methods, we exploit covisibility and registration dependency to describe the image connection which is suitable to any kind of data. Based on this general image connection, we propose a unified framework to efficiently reconstruct sequential images, unordered images, and the mixture of these two. Experiments on the unordered images and mixed data verify the effectiveness of the proposed method, which is three times faster than the state of the art on feature matching, and an order of magnitude faster on reconstruction without sacrificing the accuracy. The source code is publicly available at https://github.com/openxrlab/xrsfm
description: Accepted 27 May 2023 (TCSVT)
Modeling joint eating-out destination choices incorporating group-level impedance: A case study of the Greater Tokyo Area
Creators: name: Han, Chenglin
name: Luo, Lichen
name: Parady, Giancarlos
name: Takami, Kiyoshi
name: Chikaraishi, Makoto
name: Harata, Noboru
Publisher: name: arXiv
Year: 2023
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Individuals undertake both solo and joint activities as part of their overall activity-travel patterns. Compared to work and maintenance activities, social and leisure activities differ in that they exhibit high levels of temporal and spatial flexibility. In this study we used data from an ego-centric social networks survey in the Greater Tokyo Area and follow-up group activity survey to estimate a joint eating-out destination choice model explicitly incorporating group-level impedance. Consistent with the literature, travel time has a large impact on destination choice as measured by its elasticity; however, the elasticities of group-level maximum, average and median travel times are larger than individual-level travel times. Furthermore, we show that incorporating group-level impedance increases model performance up to 49% against the ego-level impedance model, a substantial increase that underscores the need to incorporate group-level characteristics in travel behavior models.
description: 19 pages, 8 figures
Global and local properties of AdS(2) higher spin gravity
Creators: name: Alkalaev, K. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Two-dimensional BF theory with infinitely many higher spin fields is proposed. It is interpreted as the AdS(2) higher spin gravity model describing a consistent interaction between local fields in AdS(2) space including gravitational field, higher spin partially-massless fields, and dilaton fields. We carry out analysis of the frame-like and the metric-like formulation of the theory. Infinite-dimensional higher spin global algebras and their finite-dimensional truncations are realized in terms of o(2,1) - sp(2) Howe dual auxiliary variables.
description: 51 pages; v2: comments and refs added, typos removed, JHEP version
Holographic stress tensor at finite coupling
Creators: name: Sen, Kallol
name: Sinha, Aninda
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We calculate one, two and three point functions of the holographic stress tensor for any bulk Lagrangian of the form ${\mathcal{L}}(g^{ab}, R_{abcd}, \nabla_e R_{abcd})$. Using the first law of entanglement, a simple method has recently been proposed to compute the holographic stress tensor arising from a higher derivative gravity dual. The stress tensor is proportional to a dimension dependent factor which depends on the higher derivative couplings. In this paper, we identify this proportionality constant with a B-type trace anomaly in even dimensions for any bulk Lagrangian of the above form. This in turn relates to ${\mathcal{C}}_T$, the coefficient appearing in the two point function of stress tensors. We use a background field method to compute the two and three point function of stress tensors for any bulk Lagrangian of the above form in arbitrary dimensions. As an application we consider general situations where $η/s$ for holographic plasmas is less than the KSS bound.
description: v4: further typos corrected
Heterogeneous Neuronal and Synaptic Dynamics for Spike-Efficient Unsupervised Learning: Theory and Design Principles
Creators: name: Chakraborty, Biswadeep
name: Mukhopadhyay, Saibal
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: This paper shows that the heterogeneity in neuronal and synaptic dynamics reduces the spiking activity of a Recurrent Spiking Neural Network (RSNN) while improving prediction performance, enabling spike-efficient (unsupervised) learning. We analytically show that the diversity in neurons' integration/relaxation dynamics improves an RSNN's ability to learn more distinct input patterns (higher memory capacity), leading to improved classification and prediction performance. We further prove that heterogeneous Spike-Timing-Dependent-Plasticity (STDP) dynamics of synapses reduce spiking activity but preserve memory capacity. The analytical results motivate Heterogeneous RSNN design using Bayesian optimization to determine heterogeneity in neurons and synapses to improve $\mathcal{E}$, defined as the ratio of spiking activity and memory capacity. The empirical results on time series classification and prediction tasks show that optimized HRSNN increases performance and reduces spiking activity compared to a homogeneous RSNN.
description: Paper Published in ICLR 2023 (https://openreview.net/forum?id=QIRtAqoXwj)
Certifying Higher-Order Polynomial Interpretations
Creators: name: van der Weide, Niels
name: Vale, Deivid
name: Kop, Cynthia
Publisher: name: arXiv
Year: 2023
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Higher-order rewriting is a framework in which one can write higher-order programs and study their properties. One such property is termination: the situation that for all inputs, the program eventually halts its execution and produces an output. Several tools have been developed to check whether higher-order rewriting systems are terminating. However, developing such tools is difficult and can be error-prone. In this paper, we present a way of certifying termination proofs of higher-order term rewriting systems. We formalize a specific method, namely the polynomial interpretation method, that is used to prove termination. In addition, we give a program that turns the output of Wanda, a termination analysis tool for higher-order rewriting systems, into a Coq script, so that we can check whether the output is a valid proof of termination.
description: This new version fixes typos in the introduction, adds a reference to the published version, and adds the \hideLipics command so the temporary lipics logo isn't shown. No textual content was added or removed in this version
Adaptive deterministic dyadic grids on spaces of homogeneous type
Creators: name: Lechner, Richard
name: Passenbrunner, Markus
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E40

description: In the context of spaces of homogeneous type, we develop a method to deterministically construct dyadic grids, specifically adapted to a given combinatorial situation. This method is used to estimate vector-valued operators rearranging martingale difference sequences such as the Haar system.
description: 17 pages, 2 figures
Stringy Dynamics from an Amplitudes Bootstrap
Creators: name: Cheung, Clifford
name: Remmen, Grant N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe an analytic procedure whereby scattering amplitudes are bootstrapped directly from an input mass spectrum and a handful of physical constraints: crossing symmetry, boundedness at high energies, and finiteness of exchanged spins. For an integer spectrum, this procedure gives a first principles derivation of a new infinite parameter generalization of the Veneziano amplitude that is unitary while exhibiting dual resonance and consistent high-energy behavior. Lifting to a $q$-deformed integer spectrum, we derive the Coon amplitude and its analogous generalizations. Finally, we apply this logic to derive an infinite class of deformed Virasoro-Shapiro amplitudes.
description: 7 pages, 1 figure
Granularity Metrics for IT Services
Creators: name: Heinrich, Bernd
name: Zimmermann, S.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: Paper_Granularity_ICIS
subject: 000 Allgemeines, Wissenschaft

description: Joey, F. George (Eds.), Proceedings of the International Conference on Information Systems, ICIS 2012, Orlando, USA, December 16-19, 2012. Association for Information Systems 2012, ISBN 978-0-615-71843-9.
LightTS: Lightweight Time Series Classification with Adaptive Ensemble Distillation -- Extended Version
Creators: name: Campos, David
name: Zhang, Miao
name: Yang, Bin
name: Kieu, Tung
name: Guo, Chenjuan
name: Jensen, Christian S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Due to the sweeping digitalization of processes, increasingly vast amounts of time series data are being produced. Accurate classification of such time series facilitates decision making in multiple domains. State-of-the-art classification accuracy is often achieved by ensemble learning where results are synthesized from multiple base models. This characteristic implies that ensemble learning needs substantial computing resources, preventing their use in resource-limited environments, such as in edge devices. To extend the applicability of ensemble learning, we propose the LightTS framework that compresses large ensembles into lightweight models while ensuring competitive accuracy. First, we propose adaptive ensemble distillation that assigns adaptive weights to different base models such that their varying classification capabilities contribute purposefully to the training of the lightweight model. Second, we propose means of identifying Pareto optimal settings w.r.t. model accuracy and model size, thus enabling users with a space budget to select the most accurate lightweight model. We report on experiments using 128 real-world time series sets and different types of base models that justify key decisions in the design of LightTS and provide evidence that LightTS is able to outperform competitors.
description: 15 pages. An extended version of "LightTS: Lightweight Time Series Classification with Adaptive Ensemble Distillation" accepted at SIGMOD 2023
Two-parameter scaling theory of transport near a spectral node
Creators: name: Sinner, Andreas
name: Ziegler, Klaus
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate the finite-size scaling behavior of the conductivity in a two-dimensional Dirac electron gas within a chiral sigma model. Based on the fact that the conductivity is a function of system size times scattering rate, we obtain a two-parameter scaling flow toward a finite fixed point. The latter is the minimal conductivity of the infinite system. Depending on boundary conditions, we also observe unstable fixed points with conductivities much larger than the experimentally observed values, which may account for results found in some numerical simulations. By including a spectral gap we extend our scaling approach to describe a metal-insulator transition.
description: 4.5 pages, 4 figures, published version
Breaking the $τ_{\rm T}-f$ degeneracy of the kinetic Sunyaev Zel'dovich cosmology in redshift space
Creators: name: Xiao, Liang
name: Zheng, Yi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The 'optical depth-linear growth rate' ($τ_{\rm T}-f$) degeneracy is a long-standing problem in the kinetic Sunyaev Zel'dovich (kSZ) cosmology. It can be spontaneously broken in redshift space, where the velocity field leaves its own distinct imprint on the galaxies' redshift space positions and provides valuable information of the linear growth rate. We validate this idea with the Fisher matrix and Monte Carlo Markov Chain techniques in this work, finding that the level of this degeneracy breaking is further enhanced on non-linear scales due to the non-linear evolution of the density and velocity fields, if we have a good prior knowledge of the non-linear bias of galaxies. This result emphasizes the importance of the redshift space analysis of the kSZ effect and its potential as a powerful cosmological probe, especially on non-linear scales. As a by-product, we develop a non-linear model of the redshift space density-weighted pairwise kSZ power spectrum. The fitted $f$ and $τ_{\rm T}$ values from this model are shown to be accurate within $1-2σ$ ranges of the fiducial ones when confronted to the mock galaxies mimicking a DESI+CMB-S4 survey combination, even on small scales of $k\sim 0.5h/{\rm Mpc}$.
description: 14 pages, 12 figures. A new session about impacts of the non-linear bias is added. MN accepted
Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
Creators: name: Chernikov, Alexey
name: Berkelbach, Timothy C.
name: Hill, Heather M.
name: Rigosi, Albert
name: Li, Yilei
name: Aslan, Ozgur B.
name: Reichman, David R.
name: Hybertsen, Mark S.
name: Heinz, Tony F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have experimentally determined the energies of the ground and first four excited excitonic states of the fundamental optical transition in monolayer WS2, a model system for the growing class of atomically thin two-dimensional semiconductor crystals. From the spectra, we establish a large exciton binding energy of 0.32 eV and a pronounced deviation from the usual hydrogenic Rydberg series of energy levels of the excitonic states. We explain both of these results using a microscopic theory in which the non-local nature of the effective dielectric screening modifies the functional form of the Coulomb interaction. These strong but unconventional electron-hole interactions are expected to be ubiquitous in atomically thin materials.
description: published version
Enhancing quantum synchronization through homodyne measurement, noise and squeezing
Creators: name: Shen, Yuan
name: Soh, Hong Yi
name: Fan, Weijun
name: Kwek, Leong-Chuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Quantum synchronization has been a central topic in quantum nonlinear dynamics. Despite rapid development in this field, very few have studied how to efficiently boost synchronization. Homodyne measurement emerges as one of the successful candidates for this task, but preferably in the semi-classical regime. In our work, we focus on the phase synchronization of a harmonic-driven quantum Stuart-Landau oscillator, and show that the enhancement induced by homodyne measurement persists into the quantum regime. Interestingly, optimal two-photon damping rates exist when the oscillator and driving are at resonance and with a small single-photon damping rate. We also report noise-induced enhancement in quantum synchronization when the single-photon damping rate is sufficiently large. Apart from these results, we discover that adding a squeezing Hamiltonian can further boost synchronization, especially in the semi-classical regime. Furthermore, the addition of squeezing causes the optimal two-photon pumping rates to shift and converge.
description: 6 pages, 8 figures
Roles of chiral three-nucleon forces in nucleon-nucleus scattering
Creators: name: Toyokawa, Masakazu
name: Minomo, Kosho
name: Kohno, Michio
name: Yahiro, Masanobu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the roles of chiral three-nucleon force (3NF) in nucleon-nucleus elastic scattering, using the standard framework based on the Brueckner-Hartree-Fock method for nuclear matter and the $g$-matrix folding model for the nucleon-nucleus scattering. In nuclear matter, chiral 3NF at NNLO level (mainly the 2$π$-exchange diagram) makes the single particle potential less attractive for the singlet-even channel and more absorptive for the triplet channels. The single-particle potential calculated from chiral two-nucleon force (2NF) at N$^{3}$LO level is found to be close to that from Bonn-B 2NF. The Melbourne $g$-matrix interaction is a practical effective interaction constructed by localizing the $g$-matrices calculated from Bonn-B 2NF. We then introduce the chiral-3NF effects to the local Melbourne $g$-matrix interaction. For nucleon-nucleus elastic scattering on various targets at 65 MeV, chiral 3NF makes the folding potential less attractive and more absorptive. The novel property for the imaginary part is originated in the enhancement of tensor correlations due to chiral 3NF. The two effects are small for differential cross sections and vector analyzing powers at the forward and middle angles where the experimental data are available. If backward measurements are done, the data will reveal the effects of chiral 3NF.
description: 20 pages, 9 figures
MAD Bayes for Tumor Heterogeneity Feature Allocation with Non-Normal Sampling
Creators: name: Xu, Yanxun
name: Mueller, Peter
name: Yuan, Yuan
name: Gulukota, Kamalakar
name: Ji, Yuan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We propose small-variance asymptotic approximations for the inference of tumor heterogeneity (TH) using next-generation sequencing data. Understanding TH is an important and open research problem in biology. The lack of appropriate statistical inference is a critical gap in existing methods that the proposed approach aims to fill. We build on a hierarchical model with an exponential family likelihood and a feature allocation prior. The proposed approach generalizes similar small-variance approximations proposed by Kulis and Jordan (2012) and Broderick et.al (2012) for inference with Dirichlet process mixture and Indian buffet prior models under normal sampling. We show that the new algorithm can successfully recover latent structures of different subclones and is also magnitude faster than available Markov chain Monte Carlo samplers, the latter often practically infeasible for high-dimensional genomics data. The proposed approach is scalable, simple to implement and benefits from the flexibility of Bayesian nonparametric models. More importantly, it provides a useful tool for the biological community for estimating cell subtypes in tumor samples.
Per la storia delle relazioni italo-polacche nel Novecento
Creators: name: Wos, Jan Wladyslaw
Publisher: name: Universit� di Trento. Dipartimento di Studi Letterari, Linguistici e Filologici
Year: 2008

description: Il volume contiene sei saggi, che illustrano diversi aspetti dei rap�porti fra Italia e Polonia nel XX secolo. Essi riguardano lo studioso di araldica Francesco Foucault di Daugnon e la sua opera sugli ita�liani in Polonia, le travagliate vicende della nascita del Pontificio Istituto Polacco di Roma, l?attivit� del principe Adam Stefan Sapieha alla corte pontificia, il generale W?adys?aw Anders e la partecipazione del II Corpo d?Armata dell?esercito polacco alla battaglia di Montecassino, il cardinale Stefan Wyszy?ski come precursore della Ostpolitik vaticana e infine la figura dello scrittore Jaros?aw Iwaszkiewicz in rapporto all?Italia.
Effects of de- and re-hydration events and hypo- and hyper-hydration states on cardiac and vascular mechanisms regulating BP level
Creators: name: Davydov, Dmitry M.
name: De La Coba, Pablo
name: Contreras-Merino, Ana M.
name: Paso, Gustavo A. Reyes Del
Publisher: name: Zenodo
Year: 2022
Subjects: hypohydration, dehydration, hyperhydration, rehydration, blood pressure, cardiac output, stroke volume, vasoconstriction, age, BMI

description: Supplementary material with a series of analyses related to a manuscript titled "Impact of a homeostatic body’s hydration status as risk or resiliency factor, evaluated by hemodynamic measures, on different types of pain sensitization as pathways to a chronic pain syndrome" were conducted for indicating impact of de- and re-hydration events (evoked by within-subject ortho- and clino-static challenges) and hypo- and hyper-hydration states (assessed primary by between-subject variance in averaged cardiac output associated with age and body mass variances in the sample, and secondary by between-subject variance in the hair cortisol concentration) on blood volume-related cardiac and vascular mechanisms regulating blood pressure level.
Storicit� del testo, storicit� dell'edizione
Creators: name: Ferrari, Fulvio
name: Bampi, Massimiliano
Publisher: name: Universit� di Trento
Year: 2009

description: Un intenso dibattito ha avuto luogo, nel corso degli ultimi decenni, sui modi e le finalit� della pratica ecdotica. Lo studio delle parti�colari modalit� di trasmissione e di comunicazione dei testi medie�vali e protomoderni ha infatti messo in evidenza la necessit� di te�nere conto dell?interazione tra scrittura e oralit�. � stata cos� messa in rilievo la peculiare ?instabilit�? del testo medievale, la tendenza a modificarlo a seconda delle finalit� del singolo atto di comunica�zione, delle conoscenze e della formazione culturale e ideologica del copista, delle aspettative del pubblico e del committente del codice. Il convegno Storicit� del testo, storicit� dell?edizione � stato orga�nizzato ? in conclusione di un progetto biennale di ricerca che ha visto coinvolti soprattutto studiosi di filologia germanica ? al fine di confrontare i risultati ottenuti con la discussione svolta in altri ambiti di studio, dalla filologia romanza alla letteratura latina me�dievale, dall?ispanistica alla semitistica. L?incontro tra le diverse tradizioni disciplinari ha suscitato una discussione ampia e stimo�lante, testimoniata dalle relazioni che presentiamo ora raccolte in un volume che segna una tappa importante nel dibattito italiano sull?ecdotica, sul suo senso e sulle sue prospettive nel nuovo se�colo. ?
Three-particle distribution in B meson and charm-quark loops in FCNC B decays
Creators: name: Melikhov, Dmitri
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss a nonfactorizable (NF) contribution of a charm loop to the FCNC $B$-decay amplitude given through the three-particle Bethe-Salpeter amplitude (3BS) of the $B$-meson. This 3BS contains one heavy-quark field and two light fields (a light quark and a gluon). Our discussion is aimed at clarifying properties of the $B$-meson 3BS necessary to describe properly charm-loop contributions to the amplitudes of FCNC $B$-decays. We demonstrate that the dominant contribution of nonfactorizable charm to FCNC $B$-decay amplitude is given in the heavy-quark limit by a convolution of some hard kernel and the $B$-meson 3BS in a "double-collinear" light cone (LC) configuration: one of the light degrees of freedom $ϕ(x)$, $x^2=0$, lies on the $(+)$-direction of the LC, whereas another light degree of freedom $ϕ'(x')$, $x'^2=0$ lies on the $(-)$-direction. We show the emergence of new constraints on the distribution amplitudes which parametrize the 3BS in this double-collinear configuration.
description: 12 pages, a few typos corrected, version to appear in PRD
The length and time scales of water's glass transitions
Creators: name: Limmer, David T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Using a general model for the equilibrium dynamics of supercooled liquids, I compute from molecular properties the emergent length and time scales that govern the nonequilibrium relaxation behavior of amorphous ice prepared by rapid cooling. Upon cooling, the liquid water falls out of equilibrium whereby the temperature dependence of its relaxation time is predicted to change from super-Arrhenius to Arrhenius. A consequence of this crossover is that the location of the apparent glass transition temperature depends logarithmically on cooling rate. Accompanying vitrification is the emergence of a dynamical length-scale, the size of which depends on the cooling rate and varies between angstroms and 10s of nanometers. While this protocol dependence clarifies a number of previous experimental observations for amorphous ice, the arguments are general and can be extended to other glass forming liquids.
description: significant revisions to notation; additional references and clarifications
La folla necessaria: Lope de Vega fra storia e ?mimesi antirealista?
Creators: name: Taravacci, Pietro
Publisher: name: Universit� degli Studi di Trento, Dipartimento di Studi Letterari, Linguistici e Filologici
Year: 2012

description: A partire dal saggio di Maria Grazia Profeti su Fuente Ovejuna, compreso nello stesso volume, il presente contributo si propone una riflessione sulla funzione che in Lope de Vega, ma in generale nel teatro dei Secoli d?Oro, svolge la rappresentazione delle moltitudini e delle folle in teatro. Mediante alcuni cenni alle modalit� di rappresentazione delle folle, ora pi� realistiche, ora pi� simboliche, il saggio intende suggerire che le scene in cui � protagonista la folla, lungi dall?essere un vero ostacolo alla performance, sono, di fatto, un?occasione che il teatro aureo spagnolo coglie per ribadire la propria componente immaginaria, e la necessit� di coinvolgere il pubblico in una riflessione metateatrale.
$\rm Li_x(C_5H_5N)_yFe_{2-z}Se_2$: a defect resilient expanded-lattice high-temperature superconductor
Creators: name: Deltsidis, Alexandros
name: Simonelli, Laura
name: Vailakis, Georgios
name: Berdiell, Izar Capel
name: Kopidakis, Georgios
name: Krzton-Maziopa, Anna
name: Bozin, Emil S.
name: Lappas, Alexandros
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Two-dimensional iron-chalcogenide intercalates display a remarkable correlation of the interlayer spacing with the enhancement of the superconducting critical temperature ($T_c$). In this work, synchrotron x-ray absorption ($XAS$, at Fe and Se K edges) and emission ($XES$) spectroscopies, allow to discuss how the important rise of $T_c$ (44 K) in the molecule intercalated $\rm Li_x(C_5H_5N)_yFe_{2-z}Se_2$ relates to the electronic and local structure changes felt by the inorganic host upon doping ($x$). $XES$ shows that widely-separated layers of edge-sharing $\rm FeSe_4$ tetrahedra, carry low-spin moieties with a local Fe magnetic moment slightly reduced compared to the parent $β$-$\rm Fe_{2-z}Se_2$. Pre-edge $XAS$ advises on the progressively reduced mixing of metal $3d-4p$ states upon lithiation. Doping-mediated local lattice modifications, probed by conventional $T_c$-optimization measures (cf. anion height and $FeSe_4$ tetrahedra regularity), become less relevant when layers are spaced far away. On the basis of extended x-ray absorption fine structure, such distortions are compensated by a softer Fe-network that relates to Fe-site vacancies, alleviating electron-lattice correlations and superconductivity. Density functional theory ($DFT$) guided modification of isolated $\rm Fe_{2-z}Se_2$ ($z$, vacant sites) planes, resembling the host layers, identify that Fe-site deficiency occurs at low energy cost, giving rise to stretched Fe-sheets, in accord with experiments. The robust high-$T_c$ in $\rm Li_x(C_5H_5N)_yFe_{2-z}Se_2$, arises from the interplay of electron donating spacers and the iron-selenide layers tolerance to defect chemistry, a tool to favorably tune its Fermi surface properties.
description: Main text of 29 pages, 9 Figures, 1 Table. Supplemental Material of 17 pages, 7 Figures, 1 Table