cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Active boundary layers
Creators: name: Hardoüin, Jérôme
name: Doré, Claire
name: Laurent, Justine
name: Lopez-Leon, Teresa
name: Ignés-Mullol, Jordi
name: Sagués, Francesc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The role of boundary layers in conventional liquid crystals is commonly subsumed in their anchoring on confining walls. In the classical view, anchoring enslaves the orientational field of the passive material under equilibrium conditions. In this work, we experimentally explore the role of confining walls in the behavior of an active nematic. We find that, under slip boundary conditions, the wall induces the accumulation of negatively charged topological defects in its vicinity, resulting in the formation of a topological boundary layer that polarizes the wall. While the dynamics of wall and bulk defects are decoupled, we find that the active boundary layer influences the overall dynamics of the system, to the point of fully controlling the behavior of the active nematic in situations of strong confinement. Finally, we show that wall defects exhibit behaviors that are essentially different from those of their bulk counterparts, such as high motility or the ability to recombine with another defect of like-sign topological charge. These exotic behaviors result from a change of symmetry induced by the wall in the director field around the defect. Finally, we show that the collective dynamics of wall defects can be described in terms of a one-dimensional Kuramoto-Sivashinsky -like description of spatio-temporal chaos.
description: 10 pages, 6 figures in main text, 5 figures in SI
Über die Notwendigkeit technologischer Hilfsmittel in tempopolyphoner Musik
Creators: name: Kocher, Philippe
Publisher: name: Zenodo
Year: 2017
Subjects: Algorithmische Musik
Tempopolyphonie
Musical Mathematics
Zeitgenössische Musik

description: Dieser Aufsatz thematisiert die Verwendung von Computertechnologie zur Realisation komplexer Tempostrukturen in Instrumentalmusik. Dazu werden Möglichkeiten der technologieunterstützten Kompositions- und Aufführungspraxis diskutiert und musikhistorisch kontextualisiert. Als eigener Beitrag zu dieser Thematik wird ein mathematischer Formalismus zur Berechnung von synchronisierbaren Tempoprogressionen beschrieben. Im Zentrum steht dabei die Frage nach der ästhetischen Signifikanz solcher technologischer und mathematischer Hilfsmittel.
description: + ID: 555707
Self-similarity and the Froissart bound
Creators: name: Jahan, Akbari
name: Choudhury, D. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Froissart bound implies that the total cross section (or, equivalently, the structure function) cannot rise faster than the logarithmic growth of $ \ln^{2} \left(\frac{1}{x} \right)$. In this work, we show that such a slow growth is not compatible with the notion of self-similarity. As a result, it calls for the modification of the defining transverse-momentum-dependent parton density function (TMD PDF) of a self-similarity based proton structure function $F_{2} \left(x,Q^{2} \right)$ at small \textit{x}. Using plausible assumptions, we obtain the Froissart saturation condition on this TMD PDF.
description: 11 pages, 2 figures, 1 table
Nucleon-nucleon collision profile and cross section fluctuations
Creators: name: Rybczynski, Maciej
name: Wlodarczyk, Zbigniew
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The nucleon-nucleon collision profile, being the basic entity of the wounded nucleon model, is usually adopted in the form of hard sphere or the Gaussian shape. We suggest that the cross section fluctuations given by the gamma distribution leads to the profile function which smoothly ranges between the both limiting forms. Examples demonstrating sensitivity of profile function on cross section fluctuations are discussed.
description: 13 pages, 7 figures. arXiv admin note: text overlap with arXiv:hep-ph/0505088 by other authors
A weighted L1-minimization approach for sparse polynomial chaos expansions
Creators: name: Peng, Ji
name: Hampton, Jerrad
name: Doostan, Alireza
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This work proposes a method for sparse polynomial chaos (PC) approximation of high-dimensional stochastic functions based on non-adapted random sampling. We modify the standard l1 -minimization algorithm, originally proposed in the context of compressive sampling, using a priori information about the decay of the PC coefficients and refer to the resulting algorithm as weighted l1 -minimization. We provide conditions under which we may guarantee recovery using this weighted scheme. Numerical tests are used to compare the weighted and non-weighted methods for the recovery of solutions to two differential equations with high-dimensional random inputs: a boundary value problem with a random elliptic operator and a 2-D thermally driven cavity flow with random boundary condition.
description: 37 pages, 10 figures
Superstrong nature of covalently bonded glass-forming liquids at select compositions
Creators: name: Gunasekera, K.
name: Bhosle, S.
name: Boolchand, P.
name: Micoulaut, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Variation of fragility (m) of specially homogenized GexSe100-x melts are established from complex specific heat measurements, and show m(x) has a global minimum at an extremely low value (m=14.8(0.5)) in the 21.5%Tg, we observe a slowdown of melt-homogenization by the super-strong melt compositions, 21.5%
VR-NeRF: High-Fidelity Virtualized Walkable Spaces
Creators: name: Xu, Linning
name: Agrawal, Vasu
name: Laney, William
name: Garcia, Tony
name: Bansal, Aayush
name: Kim, Changil
name: Bulò, Samuel Rota
name: Porzi, Lorenzo
name: Kontschieder, Peter
name: Božič, Aljaž
name: Lin, Dahua
name: Zollhöfer, Michael
name: Richardt, Christian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: We present an end-to-end system for the high-fidelity capture, model reconstruction, and real-time rendering of walkable spaces in virtual reality using neural radiance fields. To this end, we designed and built a custom multi-camera rig to densely capture walkable spaces in high fidelity and with multi-view high dynamic range images in unprecedented quality and density. We extend instant neural graphics primitives with a novel perceptual color space for learning accurate HDR appearance, and an efficient mip-mapping mechanism for level-of-detail rendering with anti-aliasing, while carefully optimizing the trade-off between quality and speed. Our multi-GPU renderer enables high-fidelity volume rendering of our neural radiance field model at the full VR resolution of dual 2K$\times$2K at 36 Hz on our custom demo machine. We demonstrate the quality of our results on our challenging high-fidelity datasets, and compare our method and datasets to existing baselines. We release our dataset on our project website.
description: SIGGRAPH Asia 2023; Project page: https://vr-nerf.github.io
title: erreur
Creators: name: :Unkn
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2025
Subjects: subject: SIG

description: Cette fiche détaille la démarche pour afficher des fonds de carte au choix dans QGIS grâce à une extension.
On expansions for nonlinear systems, error estimates and convergence issues
Creators: name: Beauchard, Karine
name: Borgne, Jérémy Le
name: Marbach, Frédéric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 34A45 (Primary) 17B66, 93C15 (Secondary)

description: Explicit formulas expressing the solution to non-autonomous differential equations are of great importance in many application domains such as control theory or numerical operator splitting. In particular, intrinsic formulas allowing to decouple time-dependent features from geometry-dependent features of the solution have been extensively studied. First, we give a didactic review of classical expansions for formal linear differential equations, including the celebrated Magnus expansion (associated with coordinates of the first kind) and Sussmann's infinite product expansion (associated with coordinates of the second kind). Inspired by quantum mechanics, we introduce a new mixed expansion, designed to isolate the role of a time-invariant drift from the role of a time-varying perturbation. Second, in the context of nonlinear ordinary differential equations driven by regular vector fields, we give rigorous proofs of error estimates between the exact solution and finite approximations of the formal expansions. In particular, we derive new estimates focusing on the role of time-varying perturbations. For scalar-input systems, we derive new estimates involving only a weak Sobolev norm of the input. Third, we investigate the local convergence of these expansions. We recall known positive results for nilpotent dynamics and for linear dynamics. Nevertheless, we also exhibit arbitrarily small analytic vector fields for which the convergence of the Magnus expansion fails, even in very weak senses. We state an open problem concerning the convergence of Sussmann's infinite product expansion. Eventually, we derive approximate direct intrinsic representations for the state and discuss their link with the choice of an appropriate change of coordinates.
description: Updated numbering of theorems and equations to be the same as the published version
Hierarchical octree and k-d tree grids for 3D radiative transfer simulations
Creators: name: Saftly, W.
name: Baes, M.
name: Camps, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: A crucial ingredient for numerically solving the 3D radiative transfer problem is the choice of the grid that discretizes the transfer medium. Many modern radiative transfer codes, whether using Monte Carlo or ray tracing techniques, are equipped with hierarchical octree-based grids to accommodate a wide dynamic range in densities. We critically investigate two different aspects of octree grids in the framework of Monte Carlo dust radiative transfer. Inspired by their common use in computer graphics applications, we test hierarchical k-d tree grids as an alternative for octree grids. On the other hand, we investigate which node subdivision-stopping criteria are optimal for constructing of hierarchical grids. We implemented a k-d tree grid in the 3D radiative transfer code SKIRT and compared it with the previously implemented octree grid. We also considered three different node subdivision-stopping criteria (based on mass, optical depth, and density gradient thresholds). Based on a small suite of test models, we compared the efficiency and accuracy of the different grids, according to various quality metrics. For a given set of requirements, the k-d tree grids only require half the number of cells of the corresponding octree. Moreover, for the same number of grid cells, the k-d tree is characterized by higher discretization accuracy. Concerning the subdivision stopping criteria, we find that an optical depth criterion is not a useful alternative to the more standard mass threshold, since the resulting grids show a poor accuracy. Both criteria can be combined; however, in the optimal combination, for which we provide a simple approximate recipe, this can lead to a 20% reduction in the number of cells needed to reach a certain grid quality. An additional density gradient threshold criterion can be added that solves the problem of poorly resolving sharp edges and... (abridged).
description: 10 pages, 6 figures. Accepted for publication in A&A
Certificate of Proofreading_202011-25131229
Creators: name: Proof-Reading-Service.Com Editorial Certification
Publisher: name: Zenodo
Year: 2020

description: This is to confirm that the document described below has been submitted to Proof-Reading-Service.com for editing and proofreading.
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 Document title: Antioxidant effect of ethanolic onion (Allium cepa) husk extract in ageing rats
 Author(s): Irina Chernukha, Liliya Fedulova, Ekaterina Vasilevskaya, Nadezhda Kupaeva and Elena Kotenkova.
 Format: British English
 Style guide: Antioxidants at https://www.mdpi.com/journal/antioxidants/instructions
Conflict Diagnostics in Directed Acyclic Graphs, with Applications in Bayesian Evidence Synthesis
Creators: name: Presanis, Anne M.
name: Ohlssen, David
name: Spiegelhalter, David J.
name: De Angelis, Daniela
Publisher: name: arXiv
Year: 2013
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Complex stochastic models represented by directed acyclic graphs (DAGs) are increasingly employed to synthesise multiple, imperfect and disparate sources of evidence, to estimate quantities that are difficult to measure directly. The various data sources are dependent on shared parameters and hence have the potential to conflict with each other, as well as with the model. In a Bayesian framework, the model consists of three components: the prior distribution, the assumed form of the likelihood and structural assumptions. Any of these components may be incompatible with the observed data. The detection and quantification of such conflict and of data sources that are inconsistent with each other is therefore a crucial component of the model criticism process. We first review Bayesian model criticism, with a focus on conflict detection, before describing a general diagnostic for detecting and quantifying conflict between the evidence in different partitions of a DAG. The diagnostic is a p-value based on splitting the information contributing to inference about a "separator" node or group of nodes into two independent groups and testing whether the two groups result in the same inference about the separator node(s). We illustrate the method with three comprehensive examples: an evidence synthesis to estimate HIV prevalence; an evidence synthesis to estimate influenza case-severity; and a hierarchical growth model for rat weights.
description: Published in at http://dx.doi.org/10.1214/13-STS426 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Hyers--Ulam stability of derivations and linear functions
Creators: name: Boros, Zoltán
name: Gselmann, Eszter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 39B82, 39B72

description: In this paper the following implication is verified for certain basic algebraic curves: if the additive real function $f$ approximately (i.e., with a bounded error) satisfies the derivation rule along the graph of the algebraic curve in consideration, then $f$ can be represented as the sum of a derivation and a linear function. When, instead of the additivity of $f$, it is assumed that, in addition, the Cauchy difference of $f$ is bounded, a stability theorem is obtained for such characterizations of derivations.
description: 9 pages; published in Aequationes Mathematicae in 2010
Two-dimensional Einstein numbers and associativity
Creators: name: Gregor, Tomáš
name: Haluška, Ján
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 46H70, 30G35, 12K10

description: In this paper, we deal with generalizations of real Einstein numbers to various spaces and dimensions. We search operations and their properties in generalized settings. Especially, we are interested in the generalized operation of hyperbolic addition to more-dimensional spaces, which is associative and commutative. We extend the theory to some abstract spaces, especially to Hilbert-like ones. Further, we bring two different two-dimensional generalizations of Einstein numbers and study properties of new-defined operations -- mainly associativity, commutativity, and distributive laws.
A novel soft keyboard for touchscreen phones: QWERT
Creators: name: Wang, Yanshan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: The popularity of touchscreen phones has been growing around the world since the iPhones and Android phones were released. More and more mobile phones with large touchscreen have been produced, however, the phones with small size displays are still in the majority of touch phones. The foremost interface on touch smartphones is the information input module using soft keyboards. Traditional input methods on touch phones have either too small key buttons (such as QWERTY) or too many functions (such as 3$\times$4 keyboard), which are inconvenient to use. Moreover, the conventional soft keyboards only use tapping to input texts while current touch smartphones allow various gestures on the touchscreen, such as sliding. In this paper, a novel soft keyboard called QWERT is proposed for touchscreen-based smartphones. The users can interact with phones via finger gestures of tapping or sliding when input text by using the QWERT. In doing so, the interactions between users and smartphones will be faster and easier. An experiment carried out on inexperienced human subjects shows that they can learn very fast due to their familiarities with QWERTY. A simulation experiment based on a cognitive architecture, ACT-R, was also conducted to predict the movement time (MT) of experienced human subjects. The simulation results show that the MT using QWERT outperforms other default keyboards. These outcomes imply that the novel QWERT is a viable option for touch smartphone users. Based on the novel design, an application is released on Android systems. This application is expected to give better user experience for customers who use touch smartphones.
Diversity of scales makes an advantage: The case of the Minority Game
Creators: name: Pištěk, Miroslav
name: Slanina, Frantisek
Publisher: name: arXiv
Year: 2014
Subjects: subject: Trading and Market Microstructure (q-fin.TR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We use the Minority Game as a testing frame for the problem of the emergence of diversity in socio-economic systems. For the MG with heterogeneous impacts, we show that the direct generalization of the usual agents' profit does not fit some real-world situations. As a typical example we use the traffic formulation of the MG. Taking into account vehicles of various lengths it can easily happen that one of the roads is crowded by a few long trucks and the other contains more drivers but still is less covered by vehicles. Most drivers are in the shorter queue, so the majority win. To describe such situations, we generalized the formula for agents' profit by explicitly introducing utility function depending on an agent's impact. Then, the overall profit of the system may become positive depending on the actual choice of the utility function. We investigated several choices of the utility function and showed that this variant of the MG may turn into a positive sum game.
Separating micrometer-sized particles utilizing a dusty plasma ratchet
Creators: name: Cai, Zhi-min
name: Ma, Zong-bo
name: Zhao, You-kai
name: Liu, Fu-cheng
name: He, Ya-feng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Directional transport-dominated particle separation presents major challenges in many technological applications. The Feynman ratchet can convert the random perturbation into directional transport of particles, offering innovative separation schemes. Here, we propose the design of a dusty plasma ratchet system to accomplish the separation of micron-sized particles. The dust particles are charged and suspended at specific heights within the saw channel, depending on their sizes. Bi-dispersed dust particles can flow along the saw channel in opposite directions, resulting in a perfect purity of particle separation. We discuss the underlying mechanism of particle separation, wherein dust particles of different sizes are suspended at distinctive heights and experience electric ratchet potentials with opposite orientations, leading to their contrary flows. Our results demonstrate a feasible and highly efficient method for separating micron-sized particles.
description: 5 pages, 5 figures
A Galactic Ring of Minimum Stellar Density Near the Solar Orbit Radius
Creators: name: Barros, Douglas A.
name: Lépine, Jacques R. D.
name: Junqueira, Thiago C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse the secular effects of a long-lived Galactic spiral structure on the stellar orbits with mean radii close to the corotation resonance. By test-particle simulations and different spiral potential models with parameters constrained on observations, we verified the formation of a minimum with amplitude ~ 30% - 40% of the background disk stellar density at corotation. Such minimum is formed by the secular angular momentum transfer between stars and the spiral density wave on both sides of corotation. We demonstrate that the secular loss (gain) of angular momentum and decrease (increase) of mean orbital radius of stars just inside (outside) corotation can counterbalance the opposite trend of exchange of angular momentum shown by stars orbiting the librational points L_4/5 at the corotation circle. Such secular processes actually allow steady spiral waves to promote radial migration across corotation. We propose some observational evidences for the minimum stellar density in the Galactic disk, such as its direct relation to the minimum in the observed rotation curve of the Galaxy at the radius R ~ 9 kpc (for R_0 = 7.5 kpc), as well as its association with a minimum in the distribution of Galactic radii of a sample of open clusters older than 1 Gyr. The closeness of the solar orbit radius to the corotation resonance implies that the solar orbit lies inside a ring of minimum surface density (stellar + gas). This also implies in a correction to larger values for the estimated total mass of the Galactic disk, and consequently, a greater contribution of the disk component to the inner rotation curve of the Galaxy.
description: 25 pages, 14 figures
Caps in $\mathbf{\mathbb{Z}_n^2}$
Creators: name: Kurz, Sascha
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 51E99

description: We consider point sets in $\mathbb{Z}_n^2$ where no three points are on a line - also called caps or arcs. For the determination of caps with maximum cardinality and complete caps with minimum cardinality we provide integer linear programming formulations and identify some values for small $n$.
description: 13 pages, 7 tables, 3 figures
Effects of the continuous spontaneous localization model in the regime of large localization length scale
Creators: name: Bedingham, Daniel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Working in the limit in which the localization length scale is large compared to other relevant length scales we examine three experimental situations with the continuous spontaneous localization (CSL) model---a well-motivated alternative to standard quantum theory. These are the two-slit experiment; scattering from a potential barrier; and the release of two non-interacting particles simultaneously from a potential trap. In each case we calculate the diagonal part of the time evolved density matrix giving a probability density function over final measured states. The case of the two-slit experiment is already well understood and we reproduce some known conditions for observing loss of interference. The other examples have not previously been examined in the context of CSL. For scattering from a potential barrier we find that the probability of reflection is unchanged by CSL, however, the momentum state is spread in a characteristic way. For the case of two particles released simultaneously from a trap we find that it is more likely that the particles diffuse in the same direction than would happen if the particles behaved independently. We assess the possibility of observing these effects.
description: 20 pages, 3 figures
On the weak solutions to the equations of a compressible heat conducting gas
Creators: name: Chiodaroli, Elisabetta
name: Feireisl, Eduard
name: Kreml, Ondrej
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the weak solutions to the Euler-Fourier system describing the motion of a compressible heat conducting gas. Employing the method of convex integration, we show that the problem admits infinitely many global-in-time weak solutions for any choice of smooth initial data. We also show that for any initial distribution of the density and temperature, there exists an initial velocity such that the associated initial-value problem possesses infinitely many solutions that conserve the total energy.
Pruned inside-out polytopes, combinatorial reciprocity theorems and generalized permutahedra
Creators: name: Rehberg, Sophie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52Bxx, 52B20, 52C35, 05Axx, 05C15, 05C65

description: Generalized permutahedra are a class of polytopes with many interesting combinatorial subclasses. We introduce pruned inside-out polytopes, a generalization of inside-out polytopes introduced by Beck--Zaslavsky (2006), which have many applications such as recovering the famous reciprocity result for graph colorings by Stanley. We study the integer point count of pruned inside-out polytopes by applying classical Ehrhart polynomials and Ehrhart-Macdonald reciprocity. This yields a geometric perspective on and a generalization of a combinatorial reciprocity theorem for generalized permutahedra by Aguiar-Ardila (2017), Billera-Jia-Reiner (2009), and Karaboghossian (2022). Applying this reciprocity theorem to hypergraphic polytopes allows to give a geometric proof of a combinatorial reciprocity theorem for hypergraph colorings by Aval-Karaboghossian-Tanasa (2020). This proof relies, aside from the reciprocity for generalized permutahedra, only on elementary geometric and combinatorial properties of hypergraphs and their associated polytopes.
description: 28 pages, 11 figures; revised according to referee comments, in particular reorganized structure, updated references and new section 3.3; title changed, modified notation
A Bayesian multi-layered model to predict mechanisms, types, and severity of drug-induced liver injury.
Creators: name: Semenova, Elizaveta
name: Williams, Dominic
name: Lazic, Stanley
Publisher: name: Zenodo
Year: 2019

description: Abstract: Drug-induced liver injury (DILI) is a major cause of attrition in drug development and a common reason for withdrawing a drug from the market. Predicting clinical liver toxicity is difficult, but preclinical in vitro assays and physical/chemical properties of drugs can be used as predictors. We developed a multi-layered Bayesian model where we use assay results to predict the mechanism(s) of toxicity, use the mechanisms to predict the type of liver injury, and then combine the type of injury with the clinical dose of a drug to predict the severity of injury. The model therefore has a layered structure, enabling uncertainty to propagate through the layers. Based only on assay and physchem data, along with the clinical dose, the model enables safety pharmacologists to predict the severity, type, and mechanism of liver toxicity with good accuracy.
Applications of the Casson-Walker invariant to the knot complement and the cosmetic crossing conjectures
Creators: name: Ito, Tetsuya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We give a rational surgery formula for the Casson-Walker invariant of a 2-component link in $S^{3}$ which is a generalization of Matveev-Polyak's formula. As application, we give more examples of non-hyperbolic L-space $M$ such that knots in $M$ are determined by their complements. We also apply the result for the cosmetic crossing conjecture.
description: 14 pages, 2 figures
Nonlinearity enhancement in optomechnical system
Creators: name: Zhou, Ling
name: Cheng, Jiong
name: Han, Yan
name: zhang, Weiping
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The nonlinearity is an important feature in the field of optomechanics. Employing atomic coherence, we put forward a scheme to enhance the nonlinearity of the cavity optomechanical system. The effective Hamiltonian is derived, which shows that the nonlinear strength can be enhanced by increasing the number of atoms at certain range of parameters. We also numerically study the nonlinearity enhancement beyond the effective Hamiltonian. Furthermore, we investigate the potential usage of the nonlinearity in performing quantum nondemolition (QND) measurement of the bosonic modes. Our results show that the present system exhibits synchronization, and the nonlinear effects provide us an effective method in performing QND.
description: 6 pages, 4figures
On the Controllability and Observability of Networked Dynamic Systems
Creators: name: Zhou, Tong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Some necessary and sufficient conditions are obtained for the controllability and observability of a networked system with linear time invariant (LTI) dynamics. The topology of this system is fixed but arbitrary, and every subsystem is permitted to have different dynamic input-output relations. These conditions essentially depend only on transmission zeros of every subsystem and the connection matrix among subsystems, which makes them attractive in the analysis and synthesis of a large scale networked system. As an application, these conditions are utilized to characterize systems whose steady state estimation accuracy with the distributed predictor developed in (Zhou, 2013) is equal to that of the lumped Kalman filter. Some necessary and sufficient conditions on system matrices are derived for this equivalence. It has been made clear that to guarantee this equivalence, the steady state update gain matrix of the Kalman filter must be block diagonal.
description: 30 pages, 1 figure
Absolute Lipschitz extendability and linear projection constants
Creators: name: Basso, Giuliano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Metric Geometry (math.MG)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 54C20 (Primary) 46E99, 47A10 (Secondary)

description: We prove that the absolute extendability constant of a finite metric space may be determined by computing relative projection constants of certain Lipschitz-free spaces. As an application, we show that $\mbox{ae}(3)=4/3$ and $\mbox{ae}(4)\geq (5+4\sqrt{2})/7$. Moreover, we discuss how to compute relative projection constants by solving linear programming problems.
description: revised version. To appear in Studia Mathematica
A Novel Steganography Algorithm for Hiding Text in Image using Five Modulus Method
Creators: name: Jassim, Firas A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Multimedia (cs.MM)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The needs for steganographic techniques for hiding secret message inside images have been arise. This paper is to create a practical steganographic implementation to hide text inside grey scale images. The secret message is hidden inside the cover image using Five Modulus Method. The novel algorithm is called (ST-FMM. FMM which consists of transforming all the pixels within the 5X5 window size into its corresponding multiples of 5. After that, the secret message is hidden inside the 5X5 window as a non-multiples of 5. Since the modulus of non-multiples of 5 are 1,2,3 and 4, therefore; if the reminder is one of these, then this pixel represents a secret character. The secret key that has to be sent is the window size. The main advantage of this novel algorithm is to keep the size of the cover image constant while the secret message increased in size. Peak signal-to-noise ratio is captured for each of the images tested. Based on the PSNR value of each images, the stego image has high PSNR value. Hence this new steganography algorithm is very efficient to hide the data inside the image.
A Markovian approach to the Prandtl-Tomlinson frictional model
Creators: name: Lucente, Dario
name: Petri, Alberto
name: Vulpiani, Angelo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the Prandtl-Tomlinson model in the case of a constant driving force and in the presence of thermal fluctuations. We show that the system dynamics is well reproduced by a simplified description obtained through a Markov process, even in the case of potentials with several minima. After estimating the chain parameters by numerical simulation, we compute the average velocity and friction at varying driving force and temperature. Then we take advantage of this approach for calculating the entropy produced by the system and, in the case of a single minimum potential, to derive its explicit relation with the external force and the mobility at low temperatures. We observe that the coefficient relating the entropy production to the force is not a monotonic function of the temperature.
description: 15 pages, 12 figures
Measurement of Spin-Orbit Misalignment and Nodal Precession for the Planet around Pre-Main-Sequence Star PTFO 8-8695 From Gravity Darkening
Creators: name: Barnes, Jason W.
name: van Eyken, Julian C.
name: Jackson, Brian K.
name: Ciardi, David R.
name: Fortney, Jonathan J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: PTFO 8-8695b represents the first transiting exoplanet candidate orbiting a pre-main-sequence star. We find that the unusual lightcurve shapes of PTFO 8-8695 can be explained by transits of a planet across an oblate, gravity-darkened stellar disk. We simultaneously and self-consistently fit two separate lightcurves observed in 2009 December and 2010 December. Our two self-consistent fits yield M_p = 3.0 M_Jup and M_p = 3.6 M_Jup for assumed stellar masses of M_* = 0.34 M_Sun and M_* = 0.44 M_Sun respectively. The two fits have precession periods of 293 days and 581 days. These mass determinations (consistent with previous upper limits) along with the strength of the gravity-darkened precessing model together validate PTFO 8-8695b as just the second Hot Jupiter known to orbit an M-dwarf. Our fits show a high degree of spin-orbit misalignment in the PTFO 8-8695 system: 69 +/- 2 or 73.1 +/- 0.5 degrees, in the two cases. The large misalignment is consistent with the hypothesis that planets become Hot Jupiters with random orbital plane alignments early in a system's lifetime. We predict that as a result of the highly misaligned, precessing system, the transits should disappear for months at a time over the course of the system's precession period. The precessing, gravity-darkened model also predicts other observable effects: changing orbit inclination that could be detected by radial velocity observations, changing stellar inclination that would manifest as varying v sin i, changing projected spin-orbit alignment that could be seen by the Rossiter-McLaughlin effect, changing transit shapes over the course of the precession, and differing lightcurves as a function of wavelength. Our measured planet radii of 1.64 R_Jup and 1.68 R_Jup in each case are consistent with a young, hydrogen-dominated planet that results from a hot-start formation mechanism.
description: Accepted at ApJ
ANALYSIS OF WATER QUALITY OF SMALL SCALE IRRIGATION SCHEME IN KWADON, YAMALTU-DEBA LGA OF GOMBE STATE
Creators: name: Samuel, Sule
name: Michael, Abashiya
name: Iliya, Musa
Publisher: name: EQA - International Journal of Environmental Quality
Year: 2020

description: This study assess the physio-chemical composition of different water sources available at Kwadon small-scale irrigation site and evaluate their suitability for irrigation purpose. Surface and groundwater samples were collected from stream and boreholes using 1.5 liters sterilized bottles and then analyzed for important physio-chemical quality parameters include pH, ECw, TDS, Ca++, Mg++, Na+, HCO-3, CI-, SO-4, NO3 – , K+, SAR and SSP following standard procedures. The quality rating for each parameters of water sources were rated for irrigation suitability following FAO standard guidelines. A very high positive correlation was established in the concentration level of water parameters sources from boreholes and stream. The findings of the study revealed that all the water sources were of good quality and found suitable for irrigation as must of the measured parameters were within the recommended FAO threshold level for irrigation. Thus, opportunities for scaling small-scale irrigation exist in the site. However, emphasize the need for proper application of the water and avoid activities such as washing of vehicles along the stream that could affect the quality of water.
description: EQA - International Journal of Environmental Quality, Vol. 41 (2021)
Inelastic quarkonium photoproduction in coherent hadron - hadron interactions at LHC energies
Creators: name: Goncalves, V. P.
name: Machado, M. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper we study the inelastic quarkonium photoproduction in coherent $pp/pPb/PbPb$ interactions. Considering the ultra relativistic hadrons as a source of photons, we estimate the total $ h_1 + h_2 \rightarrow h \otimes V + X$ ($V = J/Ψ$ and $Υ$) cross sections and rapidity distributions at LHC energies. Our results demonstrate that the experimental analysis of this process can be used to understand the underlying mechanism governing heavy quarkonium production.
description: 9 pages, 7 figures, 3 tables
DISP6D: Disentangled Implicit Shape and Pose Learning for Scalable 6D Pose Estimation
Creators: name: Wen, Yilin
name: Li, Xiangyu
name: Pan, Hao
name: Yang, Lei
name: Wang, Zheng
name: Komura, Taku
name: Wang, Wenping
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Scalable 6D pose estimation for rigid objects from RGB images aims at handling multiple objects and generalizing to novel objects. Building on a well-known auto-encoding framework to cope with object symmetry and the lack of labeled training data, we achieve scalability by disentangling the latent representation of auto-encoder into shape and pose sub-spaces. The latent shape space models the similarity of different objects through contrastive metric learning, and the latent pose code is compared with canonical rotations for rotation retrieval. Because different object symmetries induce inconsistent latent pose spaces, we re-entangle the shape representation with canonical rotations to generate shape-dependent pose codebooks for rotation retrieval. We show state-of-the-art performance on two benchmarks containing textureless CAD objects without category and daily objects with categories respectively, and further demonstrate improved scalability by extending to a more challenging setting of daily objects across categories.
description: Accepted by European Conference on Computer Vision, 2022; Project page: https://fylwen.github.io/disp6d.html
Structure-Function Relationship of the Sterol Transporter ABCG5/G8: Expression, Purification and Enzymatic Characterization of ABCG5/G8 Missense Loss of Function Mutations
Creators: name: Zein, Aiman
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2020
Subjects: ABCG5
ABCG8
ATP-binding cassette
Cholesterol
Plant sterol
Sterol transporter
Sitosterolemia
Cardiovascular disease

description: The heterodimeric ATP-binding cassette (ABC) transporter, ABCG5/G8, is responsible for direct secretion of cholesterol and dietary sterols into the gut lumen and the bile. Inactivating mutations of ABCG5/G8 cause sitosterolemia, a rare autosomal recessive disease characterized by the accumulation of plant sterols in plasma, hypercholesterolemia and development of premature coronary heart disease. Functional and structural characterization of ABCG5/G8 is necessary to understand its mechanism and how the genetic defects impact its function. In this thesis, I expressed seventeen constructs of various disease-causing or catalytically deficient missense mutations in Pichia pastoris yeast. This establishes reagents for in vitro functional and structural studies. Secondly, I focused on two disease mutants (ABCG5-E146Q and ABCG8-R543S) and a sterol binding mutation (ABCG5-A540F) and established large-scale purification of these mutants. Using a cholesterol hemisuccinate (CHS)-dependent ATPase assay, I determined ATP hydrolysis by these three mutants and analyze their kinetic parameters. All missense mutants showed a significantly impaired ATPase activity, but the ability of ATP binding appeared unchanged between the WT and the mutants. This work demonstrates an intimate structure-function relationship in ABCG5/G8 and sheds some light on the mechanistic details of this important cholesterol-regulating ABC transporter.
On the Design of Fast Convergent LDPC Codes: An Optimization Approach
Creators: name: Jamali, Vahid
name: Karimian, Yasser
name: Huber, Johannes
name: Ahmadian, Mahmoud
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The complexity-performance trade-off is a fundamental aspect of the design of low-density parity-check (LDPC) codes. In this paper, we consider LDPC codes for the binary erasure channel (BEC), use code rate for performance metric, and number of decoding iterations to achieve a certain residual erasure probability for complexity metric. We first propose a quite accurate approximation of the number of iterations for the BEC. Moreover, a simple but efficient utility function corresponding to the number of iterations is developed. Using the aforementioned approximation and the utility function, two optimization problems w.r.t. complexity are formulated to find the code degree distributions. We show that both optimization problems are convex. In particular, the problem with the proposed approximation belongs to the class of semi-infinite problems which are computationally challenging to be solved. However, the problem with the proposed utility function falls into the class of semi-definite programming (SDP) and thus, the global solution can be found efficiently using available SDP solvers. Numerical results reveal the superiority of the proposed code design compared to existing code designs from literature.
description: Submitted to IEEE Transactions on Communication
Deep Learning-based 3D Point Cloud Classification: A Systematic Survey and Outlook
Creators: name: Zhang, Huang
name: Wang, Changshuo
name: Tian, Shengwei
name: Lu, Baoli
name: Zhang, Liping
name: Ning, Xin
name: Bai, Xiao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In recent years, point cloud representation has become one of the research hotspots in the field of computer vision, and has been widely used in many fields, such as autonomous driving, virtual reality, robotics, etc. Although deep learning techniques have achieved great success in processing regular structured 2D grid image data, there are still great challenges in processing irregular, unstructured point cloud data. Point cloud classification is the basis of point cloud analysis, and many deep learning-based methods have been widely used in this task. Therefore, the purpose of this paper is to provide researchers in this field with the latest research progress and future trends. First, we introduce point cloud acquisition, characteristics, and challenges. Second, we review 3D data representations, storage formats, and commonly used datasets for point cloud classification. We then summarize deep learning-based methods for point cloud classification and complement recent research work. Next, we compare and analyze the performance of the main methods. Finally, we discuss some challenges and future directions for point cloud classification.