cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Analysis of Infinite Stiffness Using PID Controller
Creators: name: Choudhury, Rifat
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: The design of Proportional Integral-Derivative (PID) controller is involved to gain infinite stiffness using active vibration control system and it is a modification of previous work. The PID controller is a control loop feedback mechanism which steadily calculates a fallacy value as the difference between a desired set point and a variable process and applies correction based on proportional, integral, and derivative terms. In this paper to achieve infinite stiffness magnetic field has been created by passing current, the input of the electromagnet is the output voltage of the sensor. Depending upon the gap between electromagnet and suspended object vibration is isolated by the attractive force of the electromagnet. This paper also presents the application, limitation, and scope of this system. In our system current is controlled by Analog Circuit (PID). The current moves through the electromagnet which creates magnetic force. If the load increases the proximity sensor senses the distance and delivers signal to the controller circuit. After receiving the signal controller circuit increased current supply to the electromagnet through power amplifier circuit. Magnetic force is expanded then, and object is levitated in a stable position. If the load is decreased the proximity sensor senses the distance and delivers signal to the controller circuit. Controller circuit receives the signal and decreases current supply to the electromagnet through power amplifier circuit. Thus, magnetic force is increased, and object is levitated in a stable position. This paper reveals the feasibility of vibration control techniques for number of diverse applications. This paper is highly applicable for detecting direction that is magnetic levitation system and magnetic bearing.
description: 8 pages, 17 figures
Reservoir Computing with Spin Waves in Skyrmion Crystal
Creators: name: Lee, Mu-Kun
name: Mochizuki, Masahito
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic skyrmions are nanometric spin textures characterized by a quantized topological invariant in magnets and often emerge in a crystallized form called skyrmion crystal in an external magnetic field. We propose that magnets hosting a skyrmion crystal possess high potential for application to reservoir computing, which is one of the most successful information processing techniques inspired by functions of human brains. Our skyrmion-based reservoir exploits precession dynamics of magnetizations, i.e., spin waves, propagating in the skyrmion crystal. Because of complex interferences and slow relaxations of the spin-wave dynamics, the skyrmion spin-wave reservoir attains several important characteristics required for reservoir computing, e.g., the generalization ability, the nonlinearity, and the short-term memory. We investigate these properties by imposing three standard tasks to test the performances of reservoir, i.e., the duration-estimation task, the short-term memory task, and the parity-check task. Through these investigations, we demonstrate that magnetic skyrmion crystals are promising materials for spintronics reservoir devices. Because magnetic skyrmions emerge spontaneously in magnets via self-organization process under application of a static magnetic field, the proposed skyrmion reservoir requires neither advanced nanofabrication nor complicated manufacturing for production in contrast to other previously proposed magnetic reservoirs constructed with fabricated spintronics devices. Our proposal is expected to realize a breakthrough in the research of spintronics reservoirs of high performance.
description: 16 pages, 12 figures
Modular synchronization in complex networks with a gauge Kuramoto model
Creators: name: OH, E.
name: Choi, C.
name: Kahng, B.
name: Kim, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We modify the Kuramoto model for synchronization on complex networks by introducing a gauge term that depends on the edge betweenness centrality (BC). The gauge term introduces additional phase difference between two vertices from 0 to $π$ as the BC on the edge between them increases from the minimum to the maximum in the network. When the network has a modular structure, the model generates the phase synchronization within each module, however, not over the entire system. Based on this feature, we can distinguish modules in complex networks, with relatively little computational time of $\mathcal{O}(NL)$, where $N$ and $L$ are the number of vertices and edges in the system, respectively. We also examine the synchronization of the modified Kuramoto model and compare it with that of the original Kuramoto model in several complex networks.
description: 10 pages, 7 figures
IEEE CIS Newsletter, Issue 137, June 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 137, June, 2024
This is newsletter is issue 137, June, 2024
IEEE CIS Newsletter, Issue 136, May 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 136, May, 2024
This is newsletter is issue 136, May, 2024
Minimal Super Technicolor
Creators: name: Antola, M.
name: Di Chiara, S.
name: Sannino, F.
name: Tuominen, K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce novel extensions of the Standard Model featuring a supersymmetric technicolor sector. First we consider N=4 Super Yang-Mills which breaks to N=1 via the electroweak (EW) interactions and coupling to the MSSM. This is a well defined, economical and calculable extension of the SM involving the smallest number of fields. It constitutes an explicit example of a natural supersymmetric conformal extension of the Standard Model featuring a well defined connection to string theory. It allows to interpolate, depending on how we break the underlying supersymmetry, between unparticle physics and Minimal Walking Technicolor. As a second alternative we consider other N =1 extensions of the Minimal Walking Technicolor model. The new models allow all the standard model matter fields to acquire a mass.
description: Improved version demonstrating that this extension is phenomenologically viable. No Landau pole exists in the theory to two loops level. This is the first theory showing that supersymmetry can solve the flavor problem when coupled to low energy technicolor
Characterization and quality control test of a gigabit cable receiver ASIC (GBCR2) for the ATLAS Inner Tracker Detector upgrade
Creators: name: Zhang, W.
name: Chen, C.
name: Gong, D.
name: Hou, S.
name: Huang, G.
name: Huang, X.
name: Liu, C.
name: Liu, T.
name: Sun, H.
name: Sun, X.
name: Wang, P.
name: Ye, J.
name: Zhang, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present the characterization and quality control test of a gigabit cable receiver ASIC prototype, GBCR2, for the ATLAS Inner Tracker pixel detector upgrade. GBCR2 equalizes and retimes the uplink electrical signals from RD53B through a 6 m Twinax AWG34 cable to lpGBT. GBCR2 also pre-emphasizes downlink command signals through the same electrical connection from lpGBT to RD53B. GBCR2 has seven uplink channels each at 1.28 Gbps and two downlink channels each at 160 Mbps. The prototype is fabricated in a 65 nm CMOS process. The characterization of GBCR2 has been demonstrated that the total jitter of the output signal is 129.1 ps (peak-peak) in the non-retiming mode or 79.3 ps (peak-peak) in the retiming mode for the uplink channel and meets the requirements of lpGBT. The total power consumption of all uplink channels is 87.0 mW in the non-retiming mode and 101.4 mW in the retiming mode, below the specification of 174 mW. The two downlink channels consume less than 53 mW. A quality control test procedure is proposed and 169 prototype chips are tested. The yield is about 97.0%.
description: 14 pages, 18 figures
Occupation times of random walks in confined geometries: From random trap model to diffusion limited reactions
Creators: name: Condamin, S.
name: Tejedor, V.
name: Benichou, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider a random walk in confined geometry, starting from a site and eventually reaching a target site. We calculate analytically the distribution of the occupation time on a third site, before reaching the target site. The obtained distribution is exact, and completely explicit in the case or parallepipedic confining domains. We discuss implications of these results in two different fields: The mean first passage time for the random trap model is computed in dimensions greater than 1, and is shown to display a non-trivial dependence with the source and target positions ; The probability of reaction with a given imperfect center before being trapped by another one is also explicitly calculated, revealing a complex dependence both in geometrical and chemical parameters.
IEEE CIS Newsletter, Issue 132, January 2024 pdf.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 132, January, 2024
This is newsletter is issue 132, January, 2024
Implication of the HyperCP boson $X^0$ (214 MeV) in the flavour changing neutral current processes
Creators: name: Das, Prasanta Kumar
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the inclusive $b(c) \to s(u) μ^+ μ^-$ and the exclusive $B(D^+) \to K(π^+) μ^+ μ^-$ flavour changing neutral current decays in the light of HyperCP boson $X^0$ of mass 214 MeV recently observed in the hyperon decay $Σ^+ \to p μ^+ μ^-$. Using the branching ratio data of the above inclusive and exclusive decays, we obtain constraints on $g_1 (h_1)$ and $g_2 (h_2)$, the scalar and pseudo-scalar coupling constants of the $b-s-X^0 (c-u-X^0)$ vertices.
description: 18 pages, 10 eps figures
The trace of uniform hypergraphs with application to Estrada index
Creators: name: Fan, Yi-Zheng
name: Zheng, Jian
name: Yang, Ya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: Primary 05C65, 15A69, Secondary 13P15, 14M99

description: In this paper we investigate the traces of the adjacency tensor of hypergraphs (simply called the traces of hypergraphs). We give new expressions for the traces of hypertrees and linear unicyclic hypergraphs by the weight function assigned to their connected sub-hypergraphs, and provide some perturbation results for the traces of a hypergraph with cut vertices. As applications we determine the unique hypertree with maximum Estrada index among all hypertrees with fixed number of edges and perfect matchings, and the unique unicyclic hypergraph with maximum Estrada index among all unicyclic hypergraph with fixed number of edges and girth $3$.
IEEE CIS Newsletter, Issue 135, April 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 135, April, 2024
This is newsletter is issue 135, April, 2024
Amazon SageMaker Clarify: Machine Learning Bias Detection and Explainability in the Cloud
Creators: name: Hardt, Michaela
name: Chen, Xiaoguang
name: Cheng, Xiaoyi
name: Donini, Michele
name: Gelman, Jason
name: Gollaprolu, Satish
name: He, John
name: Larroy, Pedro
name: Liu, Xinyu
name: McCarthy, Nick
name: Rathi, Ashish
name: Rees, Scott
name: Siva, Ankit
name: Tsai, ErhYuan
name: Vasist, Keerthan
name: Yilmaz, Pinar
name: Zafar, Muhammad Bilal
name: Das, Sanjiv
name: Haas, Kevin
name: Hill, Tyler
name: Kenthapadi, Krishnaram
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Understanding the predictions made by machine learning (ML) models and their potential biases remains a challenging and labor-intensive task that depends on the application, the dataset, and the specific model. We present Amazon SageMaker Clarify, an explainability feature for Amazon SageMaker that launched in December 2020, providing insights into data and ML models by identifying biases and explaining predictions. It is deeply integrated into Amazon SageMaker, a fully managed service that enables data scientists and developers to build, train, and deploy ML models at any scale. Clarify supports bias detection and feature importance computation across the ML lifecycle, during data preparation, model evaluation, and post-deployment monitoring. We outline the desiderata derived from customer input, the modular architecture, and the methodology for bias and explanation computations. Further, we describe the technical challenges encountered and the tradeoffs we had to make. For illustration, we discuss two customer use cases. We present our deployment results including qualitative customer feedback and a quantitative evaluation. Finally, we summarize lessons learned, and discuss best practices for the successful adoption of fairness and explanation tools in practice.
Constraints on the very high energy Gamma-Ray emission with HAWC
Creators: name: Araujo, Y. Pérez
name: González, M. M.
name: Fraija, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Gamma-ray bursts (GRBs) are among the most luminous sources in the universe. The nature of their emission at TeV energies is one of the most relevant open issues related to these events. The temporal and spectral features inferred from the early and late emissions usually known as prompt and afterglow, respectively, can be interpreted within the context of the fireball model. The synchrotron self-Compton process is expected during the afterglow phase. We explain how the theoretical SSC light curves can be compared with hypothetical upper limit located at z=0.3. We show the allowed parameter space of the microphysical parameters and density of the circumburst medium. The most restrictive results are obtained when the SSC process lies in the fast cooling regime
description: Presented at the 37th International Cosmic Ray Conference(ICRC2021),Berlin, Germany-online
IEEE CIS Newsletter, Issue 139, August 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 139, August, 2024
This is newsletter is issue 139, August, 2024
IEEE CIS Newsletter, Issue 140, September 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 140, September, 2024
This is newsletter is issue 140, September, 2024
Relaxation vs decoherence: Spin and current dynamics in the anisotropic Kondo model at finite bias and magnetic field
Creators: name: Pletyukhov, Mikhail
name: Schuricht, Dirk
name: Schoeller, Herbert
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using a nonequilibrium renormalization group method we study the real-time evolution of spin and current in the anisotropic Kondo model (both antiferromagnetic and ferromagnetic) at finite magnetic field $h_0$ and bias voltage $V$. We derive analytic expressions for all times in the weak-coupling regime $\max\{V,h_0,1/t\}\gg T_c$ ($T_c=$ strong coupling scale). We find that all observables decay both with the spin relaxation and decoherence rates $Γ_{1/2}$. Various $V$-dependent logarithmic, oscillatory, and power-law contributions are predicted. The low-energy cutoff of logarithmic terms is generically identified by the difference of transport decay rates. For small times $t\ll \max\{V,h_0\}^{-1}$, we obtain universal dynamics for spin and current.
Dark matter in the Scotogenic model with spontaneous lepton number violation
Creators: name: De Romeri, Valentina
name: Nava, Jacopo
name: Puerta, Miguel
name: Vicente, Avelino
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Scotogenic models constitute an appealing solution to the generation of neutrino masses and to the dark matter mystery. In this work we consider a version of the Scotogenic model that breaks lepton number spontaneously. At this scope, we extend the particle content of the Scotogenic model with an additional singlet scalar which acquires a non-zero vacuum expectation value and breaks a global lepton number symmetry. As a consequence, a massless Goldstone boson, the majoron, appears in the particle spectrum. We discuss how the presence of the majoron modifies the phenomenology, both in flavor and dark matter observables. We focus on the fermionic dark matter candidate and analyze its relic abundance and prospects for both direct and indirect detection.
description: 22 pages, 6 figures, 2 tables
IEEE CIS Newsletter, Issue 141, October 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 141, October, 2024
This is newsletter is issue 141, October, 2024
Kinematics, structure and abundances of supernova remnant 0540-69.3
Creators: name: Lundqvist, P.
name: Lundqvist, N.
name: Shibanov, Yu. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The structure, elemental abundances, physical conditions of the LMC supernova remnant (SNR) 0540-69.3 and its surroundings were investigated using [O III] imaging and spectroscopy. Several new spectral lines are identified, both in central filaments and in interstellar clouds shocked by the supernova blast wave. The central lines are redshifted by $440\pm80$ km s$^{-1}$ with respect to the LMC, and the [O III] emission displays a symmetry axis of ring-like structures which could indicate that the pulsar shares the same general redshift as the central supernova ejecta. [O II], [S II], [Ar III] and H$β$ have more compact structures than [O III], and possibly [Ne III]. The average [O III] temperature is $23\,500 \pm 1\,800$ K, and the electron density from [S II] is typically $10^3$ cm$^{-3}$. By mass, the relative elemental abundances of the central shocked ejecta are ${\rm O:Ne:S:Ar} \approx 1:0.07:0.10:0.02$, consistent with explosion models of $13-20$ solar mass progenitors, and similar to that of SN 1987A, as is also the mixing of hydrogen and helium into the center. [O III] is also seen in freely coasting ejecta outside the pulsar-wind nebula out to well above $2\,000$ km s$^{-1}$. From this a pulsar age of $\approx 1\,200$ years is estimated. Four filaments of shocked interstellar medium with a wide range in degree of ionization of iron are identified. One was observed in X-rays, and another has a redshift of $85\pm30$ km~s$^{-1}$ relative to LMC. From this the electron density of the [O III]-emitting gas is estimated to be $10^3$ cm$^{-3}$. The line of the most highly ionized ion, [Fe XIV] $λ$5303, likely comes from an evaporation zone in connection with the radiatively cooled gas emitting, e.g., [O III].
description: Submitted to Astronomy and Astrophysics Aug. 2, 2021. 30 pages, 26 figures and 5 tables
IEEE CIS Newsletter, Issue 138, July 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 138, July, 2024
This is newsletter is issue 138, July, 2024
Quantum Alchemy and Universal Orthogonality Catastrophe in One-Dimensional Anyons
Creators: name: Mackel, Naim E.
name: Yang, Jing
name: del Campo, Adolfo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Many-particle quantum systems with intermediate anyonic exchange statistics are supported in one spatial dimension. In this context, the anyon-anyon mapping is recast as a continuous transformation that generates shifts of the statistical parameter $κ$. We characterize the geometry of quantum states associated with different values of $κ$, i.e., different quantum statistics. While states in the bosonic and fermionic subspaces are always orthogonal, overlaps between anyonic states are generally finite and exhibit a universal form of the orthogonality catastrophe governed by a fundamental statistical factor, independent of the microscopic Hamiltonian. We characterize this decay using quantum speed limits on the flow of $κ$, illustrate our results with a model of hard-core anyons, and discuss possible experiments in quantum simulation.
description: Accepted for publication in Quantum
Supersymmetric Higgs Yukawa Couplings to Bottom Quarks at next-to-next-to-leading Order
Creators: name: Noth, David
name: Spira, Michael
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The effective bottom Yukawa couplings are analyzed for the minimal supersymmetric extension of the Standard Model at two-loop accuracy within SUSY-QCD. They include the resummation of the dominant corrections for large values of tg(beta). In particular the two-loop SUSY-QCD corrections to the leading SUSY-QCD and top-induced SUSY-electroweak contributions are addressed. The residual theoretical uncertainties range at the per-cent level.
description: 25 pages, 9 figures, added comments and references, typos corrected, results unchanged, published version
Coherence requirements for quantum communication from hybrid circuit dynamics
Creators: name: Kelly, Shane P.
name: Poschinger, Ulrich
name: Schmidt-Kaler, Ferdinand
name: Fisher, Matthew P. A.
name: Marino, Jamir
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The coherent superposition of quantum states is an important resource for quantum information processing which distinguishes quantum dynamics and information from their classical counterparts. In this article we determine the coherence requirements to communicate quantum information in a broad setting encompassing monitored quantum dynamics and quantum error correction codes. We determine these requirements by considering hybrid circuits that are generated by a quantum information game played between two opponents, Alice and Eve, who compete by applying unitaries and measurements on a fixed number of qubits. Alice applies unitaries in an attempt to maintain quantum channel capacity, while Eve applies measurements in an attempt to destroy it. By limiting the coherence generating or destroying operations available to each opponent, we determine Alice's coherence requirements. When Alice plays a random strategy aimed at mimicking generic monitored quantum dynamics, we discover a coherence-tuned phase transitions in entanglement and quantum channel capacity. We then derive a theorem giving the minimum coherence required by Alice in any successful strategy, and conclude by proving that coherence sets an upper bound on the code distance in any stabelizer quantum error correction codes. Such bounds provide a rigorous quantification of the coherence resource requirements for quantum communication and error correction.
description: 19+11 pages, 12+3 figures
Two-dimensional random walk in a bounded domain
Creators: name: Basu, Mahashweta
name: Mohanty, P. K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In a recent Letter Ciftci and Cakmak [EPL 87, 60003 (2009)] showed that the two dimensional random walk in a bounded domain, where walkers which cross the boundary return to a base curve near origin with deterministic rules, can produce regular patterns. Our numerical calculations suggest that the cumulative probability distribution function of the returning walkers along the base curve is a Devil's staircase, which can be explained from the mapping of these walks to a non-linear stochastic map. The non-trivial probability distribution function(PDF) is a universal feature of CCRW characterized by the fractal dimension d=1.75(0) of the PDF bounding curve.
description: 4 pages, 7 eps figures, revtex4
The sodium hypochlorite oxidation of humic acids and prepared lignins
Creators: name: Herman, William Allan
Publisher: name: University of British Columbia
Year: 2010

description: In order to investigate the relative merits of a selective oxidant for the degradation of natural polymers, humic acid extracts from three Alberta soil sites and three British Columbia soil sites, and two Kraft's prepared wood lignins were oxidized with 1.6 N NaOCl at room temperature (23°C) for 5 days. The oxidation products included CO₂, highly volatile acids and organic solvent soluble (OSS) products with the relative size of each fraction determined by carbon content. OSS products were characterized by Infrared (IR), Thin Layer Chromatography (TLC) and Nuclear Magnetic Resonance (NMR) techniques and identified after methylation and separation by Gas Liquid Chromatography (GLC) methods involving co-injecting authentic compounds and matching elution time and temperature of some of the components with that of the authentic compounds. Proceeding from the known chemistry of the NaOCl reaction, the CO₂ and highly volatile acid products could only be derived from the aliphatic chain or saturated ring components of humic acids or lignin and represented 66 to 82% of the products assuming no destruction of aromatic structure. Benzene carboxylic acid products were derived from the aromatic component of the starting materials. Estimates of the degree of aromaticity of the starting materials, using GLC and potentiometric titration data, were substantially less than those calculated from proposed model humic acid and lignin structures in the soils literature. An unidentified oily component was found in the oxidation products of two of the humic acid preparations. The results of this study indicated humic acid and lignin are composed of a mixed aliphatic-aromatic compound system. The relatively more mature humic acid preparations were found to be of greater aromaticity than the less mature samples. It was found 2 that NaOCl was not totally selective in differentiating Sp² from Sp³ carbon hybrids; as a result the total discrimination between aliphatic and aromatic structures was not a safe assumption. It is postulated that aromatic ring opening may occur at sites of hydroxyl group substitution on the ring structures resulting in an apparent less aromaticity and the generation
Positively curved Finsler metrics on vector bundles II
Creators: name: Wu, Kuang-Ru
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: We show that if $E$ is an ample vector bundle of rank at least two with some curvature bound on $O_{P(E^*)}(1)$, then $E^*\otimes \det E$ is Kobayashi positive. The proof relies on comparing the curvature of $(\det E^*)^k$ and $S^kE$ for large $k$ and using duality of convex Finsler metrics. Following the same thread of thought, we show if $E$ is ample with similar curvature bounds on $O_{P(E^*)}(1)$ and $O_{P(E\otimes \det E^*)}(1)$, then $E$ is Kobayashi positive. With additional assumptions, we can furthermore show that $E^*\otimes \det E$ and $E$ are Griffiths positive.
description: 24 pages
On some analytical approaches to the study of consumer brand-switching behavior
Creators: name: Windal, Pierre Marie
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this research is to analyse, discuss and extend the analytical methodology associated with the study of consumer brand-switching behavior. As such, it attempts to add to the existing understanding of the structure of the consumer brand choice process. Rational human behavior may be viewed as a succession of choices made among more or less well defined alternatives. The problem we analyse in this study is how to predict these choices when the alternatives are fixed in advance. The alternatives considered in this study are low-cost, frequently purchased, brand identified consumer products. The unit of analysis is the individual consumer. Stochastic models of brand choice are developed and used as constructs for organizing and interpreting brand choice data. These models are subsequently used to test specific hypotheses about brand loyalty (the tendency for consumers to hold a favorable attitude toward - and concentrate their purchases on - a particular brand) and brand-switching (the tendency for consumers to purchase more than one brand over a period of time). In this respect, this dissertation follows the framework of earlier brand choice studies. In many dimensions, however, this research is significantly different from most stochastic models of brand-switching behavior developed in the past. First, this research deals essentially with multi-brand switching behavior as oppose to mere brand loyalty. By collapsing the market into an artificial two-brand market (to achieve mathematical tractability), earlier researchers were forced to concentrate on repeat purchase behavior only. All the information about brand switching activity was lost in the aggregation process. In today's differentiated markets, the competition has to be monitored on a brand-by-brand basis, and this is best achieved through the use of models that deal explicitly with multibrand switching, such as the one developed in this study. Second, this research views consumer brand choice behavior as both a cognitive and a stochastic process. A multi-dimensionally scaled configuration is used as a specification of consumers' cognitive structures. Perceptual distances derived from this configuration are then related to brand choice and brand-switching probabilities through a model that takes into account the constraints imposed on the various probabilities. The empirical results demonstrate that perceptions, preferences and cognitive structures are indeed significant determinants of consumer brand-switching behavior.
Next-to-leading order perturbative QCD predictions for exclusive $J/ψ$ photoproduction in oxygen-oxygen and lead-lead collisions at the LHC
Creators: name: Eskola, Kari J.
name: Flett, Christopher A.
name: Guzey, Vadim
name: Löytäinen, Topi
name: Paukkunen, Hannu
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present predictions for the cross sections of coherent $J/ψ$ photoproduction in lead-lead and oxygen-oxygen ultraperipheral collisions (UPCs) as a function of the $J/ψ$ rapidity at the LHC in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD. Taking generalized parton distribution functions in their forward limit and using the EPPS21, nNNPDF3.0, and nCTEQ15WZSIH nuclear parton distribution functions, we update our recent results for Pb-Pb collisions, make detailed predictions for O-O collisions for several beam energy configurations, and examine the ratio of O-O and Pb-Pb UPC cross sections. We show that the latter observable allows one to significantly reduce the scale uncertainty of NLO predictions for this process.
description: 21 pages, 18 figures. Revised version with corrected error bands for nNNPDF3.0 results in Figs. 4 and 15-18. Matches the published Erratum, Phys. Rev. C 108, 069901 (2023)
Density functional study of BaNi$_2$As$_2$: Electronic structure, phonons and electron-phonon superconductivity
Creators: name: Subedi, Alaska
name: Singh, David J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the properties of BaNi$_2$As$_2$ using first principles calculations. The band structure has a similar shape to that of the BaFe$_2$As$_2$, and in particular shows a pseudogap between a manifold of six heavy $d$ electron bands and four lighter $d$ bands, i.e. at an electron count of six $d$ electrons per Ni. However, unlike BaFe$_2$As$_2$, where the Fermi energy occurs at the bottom of the pseudogap, the two additional electrons per Ni in the Ni compound place the Fermi energy in the upper manifold. Thus BaNi$_2$As$_2$ has large Fermi surfaces very distinct from BaFe$_2$As$_2$. Results for the phonon spectrum and electron-phonon coupling are consistent with a classification of this material as a conventional phonon mediated superconductor although spin fluctuations and nearness to magnetism may be anticipated based on the value of $N(E_F)$.
description: Phonon dispersion figure corrected
Gelis vicinus
Creators: name: Riedel
name: Pénigot
name: Schwarz
name: Diller
name: Johansson
name: Japoshvili, G.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Gelis
Gelis vicinus

description: Gelis vicinus (GRAVENHORST, 1829), det. Schwarz
M a t e r i a l e x a m i n e d: Trap4:1♁15-29.vi.
D i s t r i b u t i o n: Transpalaearctic, new record for Georgia and the Caucasus region.
description: Published as part of Riedel, Pénigot, Schwarz, Diller, Johansson & Japoshvili, G., 2023, Darwin wasps (Hymenoptera, Ichneumonidae) of the Kintrishi National Park, Sakartvelo (Georgia), with descriptions of six new species, pp. 61-153 in Linzer biologische Beiträge 55 (1) on page 122, DOI: 10.5281/zenodo.10415120
Fermion localization in generalised Randall Sundrum model
Creators: name: Koley, Ratna
name: Mitra, Joydip
name: SenGupta, Soumitra
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A generalized two-brane Randall-Sundrum warped braneworld model admits of solutions of the warp factor for both positive or negative cosmological constant on the visible 3-brane which can resolve the naturalness problem in connection with the fine tuning of Higgs mass in the standard model of elementary particles. To explore the location of the standard model fermions in such a generalized warped model, we, in this work, determine the dependence of the localization profile of a bulk fermion on the brane cosmological constant brane tension and the bulk fermion mass. Our results reveal that for a positive and small value of the induced cosmological constant a bulk fermion is localized close to the brane. On the other hand for a visible brane with negative cosmological constant and positive tension, the fermions are localized inside the bulk leading to phenomenologically interesting possibilities.
description: 5 pages, 7 figures, Revtex
Beyond convergence rates: Exact recovery with Tikhonov regularization with sparsity constraints
Creators: name: Lorenz, Dirk A.
name: Schiffler, Stefan
name: Trede, Dennis
Publisher: name: arXiv
Year: 2010
Subjects: subject: Functional Analysis (math.FA)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 47A52, 65J20

description: The Tikhonov regularization of linear ill-posed problems with an $\ell^1$ penalty is considered. We recall results for linear convergence rates and results on exact recovery of the support. Moreover, we derive conditions for exact support recovery which are especially applicable in the case of ill-posed problems, where other conditions, e.g. based on the so-called coherence or the restricted isometry property are usually not applicable. The obtained results also show that the regularized solutions do not only converge in the $\ell^1$-norm but also in the vector space $\ell^0$ (when considered as the strict inductive limit of the spaces $\R^n$ as $n$ tends to infinity). Additionally, the relations between different conditions for exact support recovery and linear convergence rates are investigated. With an imaging example from digital holography the applicability of the obtained results is illustrated, i.e. that one may check a priori if the experimental setup guarantees exact recovery with Tikhonov regularization with sparsity constraints.
The irregular set for maps with almost weak specification property has full metric mean dimension
Creators: name: Liu, Chunlin
name: Liu, Xue
Publisher: name: arXiv
Year: 2022
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: Primary:37A35, 37C45. Second:37B05

description: Let $(X, d)$ be a compact metric space, $f: X \to X$ be a continuous transformation with the almost weak specification property and $φ: X \to \mathbb{R}$ be a continuous function. We consider the set (called the irregular set for $φ$) of points for which the Birkhoff average of $φ$ does not exist and show that this set is either empty or carries full Bowen upper and lower metric mean dimension.
Generalized Real-space Chern Number Formula and Entanglement Hamiltonian
Creators: name: Fan, Ruihua
name: Zhang, Pengfei
name: Gu, Yingfei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We generalize a real-space Chern number formula for gapped free fermions to higher orders. Using the generalized formula, we prove recent proposals for extracting thermal and electric Hall conductance from the ground state via the entanglement Hamiltonian in the special case of non-interacting fermions, providing a concrete example of the connection between entanglement and topology in quantum phases of matter.
description: 9 pages + 3 appendices; v2, typo fixed, improve the abstract and introduction
Simple Video Generation using Neural ODEs
Creators: name: Kanaa, David
name: Voleti, Vikram
name: Kahou, Samira Ebrahimi
name: Pal, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Despite having been studied to a great extent, the task of conditional generation of sequences of frames, or videos, remains extremely challenging. It is a common belief that a key step towards solving this task resides in modelling accurately both spatial and temporal information in video signals. A promising direction to do so has been to learn latent variable models that predict the future in latent space and project back to pixels, as suggested in recent literature. Following this line of work and building on top of a family of models introduced in prior work, Neural ODE, we investigate an approach that models time-continuous dynamics over a continuous latent space with a differential equation with respect to time. The intuition behind this approach is that these trajectories in latent space could then be extrapolated to generate video frames beyond the time steps for which the model is trained. We show that our approach yields promising results in the task of future frame prediction on the Moving MNIST dataset with 1 and 2 digits.
description: 8 pages, 4 figures, NeurIPS 2019 workshop
A search for the $K^+\toμ^-νe^+e^+$ decay
Creators: name: NA62 Collaboration
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for the $K^+\toμ^-νe^+e^+$ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016--2018. An upper limit of $8.1\times 10^{-11}$ is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.
description: Final version, published in Physics Letters B
IEEE CIS Newsletter, Issue 133, February 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 133, February, 2024
This is newsletter is issue 133, February, 2024
IEEE CIS Newsletter, Issue 143, December 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 143, December, 2024
This is newsletter is issue 143, December, 2024
IEEE CIS Newsletter, Issue 134, March 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 134, March, 2024
This is newsletter is issue 134, March, 2024
Chaotic light scattering around extremal black holes
Creators: name: Kluitenberg, Martijn
name: Roest, Diederik
name: Seri, Marcello
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37B10, 34C28, 34L25, 83C57

description: We show that the scattering of light in the field of $N\geq 3$ static extremal black holes is chaotic in the planar case. The relativistic dynamics of such extremal objects reduce to that of a classical Hamiltonian system. Certain values of the dilaton coupling then allow one to apply techniques from symbolic dynamics and classical potential scattering. This results in a lower bound on the topological entropy of order $\log(N-1)$, thus proving the emergence of chaotic scattering for $N \geq 3$ black holes.
description: Refereed version
IEEE CIS Newsletter, Issue 142, November 2024.pdf
Creators: Various
Publisher: name: IEEE
Year: 2024

The IEEE CIS newsletter aims to disseminate information about events, activities and opportunities in the computational intelligence community worldwide, with a specific focus on those organized or promoted by CIS. Typical information is news about the CIS' life, conference and journal special issue call for papers, summer schools, competitions, job offerings, and much more. This is newsletter is issue 142, November, 2024
This is newsletter is issue 142, November, 2024