cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Squeezing properties of the Kerr-down conversion system
Creators: name: El-Orany, Faisal A. A.
name: Abdalla, M. Sebawe
name: Perina, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this Letter we describe a new two-mode system, which consists of Kerr-like medium and down conversion process, called the Kerr-down conversion system. Under a certain condition we can obtain an exact solution of the dynamical equations of motion. For this system we investigate different kinds of quadrature squeezing, e.g., single-mode, two-mode and sum-squeezing. Also we give a more general definition of the principal squeezing. We show that the amounts of nonclassical effects produced by the Kerr-like and down-conversion processes separately are greater than those obtained from the Kerr-down conversion system where both the processes are in competition.
description: 12 pages, 3 figures
Entangled Collective Spin States of Two Species Ultracold atoms in a Ring
Creators: name: Opatrný, Tomáš
name: Das, Kunal K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the general quantum Hamiltonian that can be realized with two species of mutually interacting degenerate ultracold atoms in a ring-shaped trap, with the options of rotation and an azimuthal lattice. We examine the spectrum and the states with a collective spin picture in a Dicke state basis. The system can generate states with a high degree of entanglement gauged by the von Neumann entropy. The Hamiltonian has two components, a linear part that can be controlled and switched on via rotation or the azimuthal lattice, and an interaction-dependent quadratic part. Exact solutions are found for the quadratic part for equal strengths of intra-species and the inter-species interactions, but for generally different particle numbers in the two species. The quadratic Hamiltonian has a degenerate ground state when the two species have unequal number of particles, but non-degenerate when equal. We determine the impact on the entanglement entropy of deviations from equal particle numbers as well as deviations from the assumption of equal interaction strengths. Limiting cases are shown to display features of a beam-splitter and spin-squeezing that can find utility in interferometry. The density of states for the full Hamiltonian shows features as of phase transition in varying between linear and quadratic limits.
description: 8 pages, 6 figures
Many-body coherent destruction of tunneling in photonic lattices
Creators: name: Longhi, Stefano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An optical realization of the phenomenon of many-body coherent destruction of tunneling, recently predicted for interacting many-boson systems by Gong, Molina and Haenggi [Phys. Rev. Lett. 103, 133002 (2009)], is proposed for light transport in engineered waveguide arrays. The optical system enables a direct visualization in Fock space of the many-body tunneling control process
description: 4 pages, 3 figures. arXiv admin note: some text overlap with arXiv:1101.4762
DeDA: Deep Directed Accumulator
Creators: name: Zhang, Hang
name: Wang, Rongguang
name: Hu, Renjiu
name: Zhang, Jinwei
name: Li, Jiahao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Chronic active multiple sclerosis lesions, also termed as rim+ lesions, can be characterized by a hyperintense rim at the edge of the lesion on quantitative susceptibility maps. These rim+ lesions exhibit a geometrically simple structure, where gradients at the lesion edge are radially oriented and a greater magnitude of gradients is observed in contrast to rim- (non rim+) lesions. However, recent studies have shown that the identification performance of such lesions remains unsatisfied due to the limited amount of data and high class imbalance. In this paper, we propose a simple yet effective image processing operation, deep directed accumulator (DeDA), that provides a new perspective for injecting domain-specific inductive biases (priors) into neural networks for rim+ lesion identification. Given a feature map and a set of sampling grids, DeDA creates and quantizes an accumulator space into finite intervals, and accumulates feature values accordingly. This DeDA operation is a generalized discrete Radon transform and can also be regarded as a symmetric operation to the grid sampling within the forward-backward neural network framework, the process of which is order-agnostic, and can be efficiently implemented with the native CUDA programming. Experimental results on a dataset with 177 rim+ and 3986 rim- lesions show that 10.1% of improvement in a partial (false positive rate<0.1) area under the receiver operating characteristic curve (pROC AUC) and 10.2% of improvement in an area under the precision recall curve (PR AUC) can be achieved respectively comparing to other state-of-the-art methods. The source code is available online at https://github.com/tinymilky/DeDA
description: 18 pages, 3 Tables and 4 figures
Discovery of Variability of the Progenitor of SN 2011dh in M51 Using the Large Binocular Telescope
Creators: name: Szczygieł, D. M.
name: Gerke, J. R.
name: Kochanek, C. S.
name: Stanek, K. Z.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We show that the candidate progenitor of the core-collapse SN 2011dh in M51 (8 Mpc away) was fading by 0.039 +- 0.006 mag/year during the three years prior to the supernova, and that this level of variability is moderately unusual for other similar stars in M 51. While there are uncertainties about whether the true progenitor was a blue companion to this candidate, the result illustrates that there are no technical challenges to obtaining fairly high precision light curves of supernova progenitors using ground based observations of nearby (<10 Mpc) galaxies with wide field cameras on 8m-class telescopes. While other sources of variability may dominate, it is even possible to reach into the range of evolution rates required by the quasi-static evolution of the stellar envelope. For M 81, where we have many more epochs and a slightly longer time baseline, our formal 3 sigma sensitivity to slow changes is presently 3 millimag/year for a M_V ~= -8 mag star. In short, there is no observational barrier to determining whether the variability properties of stars in their last phases of evolution (post Carbon ignition) are different from earlier phases.
description: 17 pages, 5 figures, submitted to ApJ
Pressure-Driven Orbital Selective Insulator to Metal Transition and Spin State Crossover in Cubic CoO
Creators: name: Huang, Li
name: Wang, Yilin
name: Dai, Xi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The metal-insulator and spin state transitions of CoO under high pressure are studied by using density functional theory combined with dynamical mean-field theory. Our calculations predict that the metal-insulator transition in CoO is a typical orbital selective Mott transition, where the $t_{2g}$ orbitals of Co 3d shell become metallic firstly around 60 GPa while the $e_g$ orbitals still remain insulating until 170 GPa. Further studies of the spin states of Co 3d shell reveal that the orbital selective Mott phase in the intermediate pressure regime is mainly stabilized by the high-spin state of the Co 3d shell and the transition from this phase to the full metallic state is driven by the high-spin to low-spin transition of the Co$^{2+}$ ions. Our results are in good agreement with the most recent transport and x-ray emission experiments under high pressure.
description: 5+ pages, 4 figures
Information Content of Spontaneous Symmetry Breaking
Creators: name: Gleiser, Marcelo
name: Stamatopoulos, Nikitas
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We propose a measure of order in the context of nonequilibrium field theory and argue that this measure, which we call relative configurational entropy (RCE), may be used to quantify the emergence of coherent low-entropy configurations, such as time-dependent or time-independent topological and nontopological spatially-extended structures. As an illustration, we investigate the nonequilibrium dynamics of spontaneous symmetry-breaking in three spatial dimensions. In particular, we focus on a model where a real scalar field, prepared initially in a symmetric thermal state, is quenched to a broken-symmetric state. For a certain range of initial temperatures, spatially-localized, long-lived structures known as oscillons emerge in synchrony and remain until the field reaches equilibrium again. We show that the RCE correlates with the number-density of oscillons, thus offering a quantitative measure of the emergence of nonperturbative spatiotemporal patterns that can be generalized to a variety of physical systems.
description: LaTeX, 9 pages, 5 figures, 1 table
ผลการใช้กิจกรรม “ลดเวลาเรียน เพิ่มเวลารู้” โดยใช้ศิลปะมวยไทยที่มีต่อทักษะการป้องกันตนเองของนักเรียนหญิงมัธยมศึกษาตอนต้น
Creators: name: กิตติศักดิ์ เพ็ญโรจน์
Publisher: name: ศูนย์นวัตกรรมทางการศึกษา สื่อสิ่งพิมพ์ และสื่อออนไลน์
Year: 2564
Subjects: ศิลปะมวยไทย
ทักษะการป้องกันตนเอง
นักเรียนหญิงมัธยมศึกษาตอนต้น

description: วารสารครุศาสตร์, 49, 1, EDUCU4901001 (12 หน้า)
Constraining properties of dusty environments by infrared variability
Creators: name: Hoenig, Sebastian F.
name: Kishimoto, Makoto
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present model simulations of time-variable infrared (IR) emission from dust as a consequence of variability of the incident radiation. For that we introduce a generalized treatment for temperature variations in a dusty environment, which is not limited to any specific astronomical source. The treatment has been incorporated into a simplified clumpy torus model, with the radial brightness distribution as the main parameter, to study the IR emission of type 1 active galactic nuclei (AGN). We show that any variability signal in the optical is smoothened stronger if the brightness distribution is very extended, and this smoothing strongly depends on wavelength. This also affects time lags between the optical and near-/mid-IR emission, which can be up to 10s of sublimation radii for long wavelengths and extended brightness distributions. The dependence of time lag on wavelength and distribution can be used to quantify the brightness distribution in an AGN torus, either by comparing optical light curves to near-IR and mid-IR light curves, or by directly comparing near-IR to mid-IR light curves. Moreover, our model has been applied to near-IR data of the nearby Seyfert 1 galaxy NGC 4151. We show that the simple model can reproduce the overall observed variability signal and found that about 40% of the energy in the variability signal in the V-band has been converted into K-band variability. This low value may be explained by a "snowball" model of gradually-sublimating clouds at the inner edge of the torus. We also note that our modeling does not support a change of time lag/sublimation radius over the observed light curve epoch in spite of a significant change in V-band emission.
description: 8 pages, 8 figures; accepted for publication in A&A
Magnetic bit stability: Competition between domain-wall and monodomain switching
Creators: name: Hoffman, Silas
name: Tserkovnyak, Yaroslav
name: Amiri, Pedram Khalili
name: Wang, Kang L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We numerically study the thermal stability properties of computer memory storage realized by a magnetic ellipse. In the case of practical magnetic random-access memory devices, the bit can form a spin texture during switching events. To study the energy barrier for thermally-induced switching, we develop a variational procedure to force the bit to traverse a smooth path through configuration space between the points of stability. We identify textured configurations realizing domain-wall propagation, which may have an energy barrier less than that of the corresponding monodomain model. We contrast the emergence of such micromagnetic effects in thermal versus field-induced switching.
description: 4 pages, 4 figures
An Indexing Technique for Compliance Checking and Maintenance in Large Process and Rule Repositories
Creators: name: Rinderle-Ma, Stefanie
name: Kabicher-Fuchs, Sonja
Publisher: name: Gesellschaft für Informatik e.V. (The German Informatics Society)
Year: 2016
Subjects: BusinessProcess Modelling; Business Process Compliance; Rule-Based Compliance Checking

description: Business process compliance has become a crucial challenge for enterprises throughout different domains. However, little thought has been spent on the management and verification of compliance rules in large process repositories so far, even though several case studies show, that the amount of business processes can reach from a small set to hundreds of business processes being subject to several hundreds of compliance rules. In this paper we present activity-oriented indexing techniques for efficient compliance checking which are particularly applicable in process and rule repositories where no a-priori knowledge, \eg based on policies, is available. Different applications beyond compliance checking are discussed such as process similarity notions or maintenance issues. The effects of applying indexing on the effort for compliance checks are discussed along with further aspects such as maintenance of process model and compliance rule repositories. Finally, a case study from the higher education domain in Austria is provided. The presented techniques constitute a first step towards a cost- and effort-aware management of large business process and compliance rule repositories.
description: Enterprise Modelling and Information Systems Architectures, Vol 11 (2016)
Tuning the anomalous Nernst and Hall effects with shifting the chemical potential in Fe-doped and Ni-doped Co$_3$Sn$_2$S$_2$
Creators: name: Liu, Jie
name: Ding, Linchao
name: Xu, Liangcai
name: Li, Xiaokang
name: Behnia, Kamran
name: Zhu, Zengwei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Co$_3$Sn$_2$S$_2$ is believed to be a magnetic Weyl semimetal. It displays large anomalous Hall, Nernst and thermal Hall effects with a remarkably large anomalous Hall angle. Here, we present a comprehensive study of how substituting Co by Fe or Ni affects the electrical and thermoelectric transport. We find that doping alters the amplitude of the anomalous transverse coefficients. The maximum decrease in the amplitude of the low-temperature anomalous Hall conductivity $σ^A_{ij}$ is twofold. Comparing our results with theoretical calculations of the Berry spectrum assuming a rigid shift of the Fermi level, we find that given the modest shift in the position of the chemical potential induced by doping, the experimentally observed variation occurs five times faster than expected. Doping affects the amplitude and the sign of the anomalous Nernst coefficient. Despite these drastic changes, the amplitude of the $α^A_{ij}/σ^A_{ij}$ ratio at the Curie temperature remains close to $\approx 0.5 k_B/e$, in agreement with the scaling relationship observed across many topological magnets.
description: 8 pages, 9 figures
Be abundances in cool main-sequence stars with exoplanets
Creators: name: Mena, E. Delgado
name: Israelian, G.
name: Hernández, J. I. González
name: Santos, N. C.
name: Rebolo, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present new UVES spectra of a sample of 15 cool unevolved stars with and without detected planetary companions. Together with previous determinations, we study Be depletion and possible differences in Be abundances between both groups of stars. We obtain a final sample of 89 and 40 stars with and without planets, respectively, which covers a wide range of effective temperatures, from 4700 K to 6400 K, and includes several cool dwarf stars for the first time. We determine Be abundances for these stars and find that for most of them (the coolest ones) the BeII resonance lines are often undetectable, implying significant Be depletion. While for hot stars Be abundances are aproximately constant, with a slight fall as Teff decreases and the Li-Be gap around 6300 K, we find a steep drop of Be content as Teff decreases for Teff < 5500 K, confirming the results of previous papers. Therefore, for these stars there is an unknown mechanism destroying Be that is not reflected in current models of Be depletion. Moreover, this strong Be depletion in cool objects takes place for all the stars regardless of the presence of planets, thus, the effect of extra Li depletion in solar-type stars with planets when compared with stars without detected planets does not seem to be present for Be, although the number of stars at those temperatures is still small to reach a final conclusion.
description: Accepted for publication in ApJ
On the equivalence between the Wilson flow and stout-link smearing
Creators: name: Nagatsuka, Masato
name: Sakai, Keita
name: Sasaki, Shoichi
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present the numerical equivalence between the Wilson flow and stout-link smearing, both of which are known to be a relatively new technique for smoothing the gauge fields on the lattice. Although the conceptional correspondence between two methods was first pointed out by Lüscher in his original paper [J. High Energy Phys.~08 (2010) 071], we provide a direct analytical proof of the equivalence between the two methods at finite lattice spacing $a$ in the zero limit of the stout-smearing parameter $ρ$. The leading order corrections start at ${\cal O}(ρ)$, which would induce ${\cal O}(a^2)$ corrections. It is, therefore, not obvious that they remain equivalent even with finite parameters ($a\neq 0$ and $ρ\neq0$) within some numerical precision. In this paper, we demonstrate the equivalence of both methods by directly comparing the expectation value of the action density, which is measured in actual numerical simulations.
description: 22 pages, 7 figures; v2: major updates regarding to analytic proof of the equivalence of two methods, conclusions remain unchanged, v3: version published in PRD
Effective transport barriers in nontwist systems
Creators: name: Szezech, J. D.
name: Caldas, I. L.
name: Lopes, S. R.
name: Morrison, P. J.
name: Viana, R. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In fluids and plasmas with zonal flow reversed shear, a peculiar kind of transport barrier appears in the shearless region, one that is associated with a proper route of transition to chaos. Using a symplectic nontwist maps, which model such zonal flows, we investigate these barriers. In particular, the standard nontwist map, a paradigm of nontwist systems, is used to analyze the parameter dependence of the transport through a broken shearless barrier. Varying a proper control parameter, we identify the onset of structures with high stickiness that give rise to an effective barrier near the broken shearless curve. Several diagnostics are used: stickiness is measured by escape time and transmissivity plots, while barriers that separate different regions of stickiness are identified by employing two indicators in the phase space, the finite-time rotation number and the finite-time Lyapunov exponent.
description: 20 pages, 9 figures
Mining Education Data to Predict Student's Retention: A comparative Study
Creators: name: Yadav, Surjeet Kumar
name: Bharadwaj, Brijesh
name: Pal, Saurabh
Publisher: name: arXiv
Year: 2012
Subjects: subject: Machine Learning (cs.LG)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: The main objective of higher education is to provide quality education to students. One way to achieve highest level of quality in higher education system is by discovering knowledge for prediction regarding enrolment of students in a course. This paper presents a data mining project to generate predictive models for student retention management. Given new records of incoming students, these predictive models can produce short accurate prediction lists identifying students who tend to need the support from the student retention program most. This paper examines the quality of the predictive models generated by the machine learning algorithms. The results show that some of the machines learning algorithms are able to establish effective predictive models from the existing student retention data.
description: 5 pages. arXiv admin note: substantial text overlap with arXiv:1202.4815
Age spread in W3 Main: LBT/LUCI near-infrared spectroscopy of the massive stellar content
Creators: name: Bik, A.
name: Henning, Th.
name: Stolte, A.
name: Brandner, W.
name: Gouliermis, D. A.
name: Gennaro, M.
name: Pasquali, A.
name: Rochau, B.
name: Beuther, H.
name: Ageorges, N.
name: Seifert, W.
name: Wang, Y.
name: Kudryavtseva, N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present near-infrared multi-object spectroscopy and JHKs imaging of the massive stellar content of the Galactic star-forming region W3 Main, obtained with LUCI at the Large Binocular Telescope. We confirm 15 OB stars in W3 Main and derive spectral types between O5V and B4V from their absorption line spectra. Three massive Young Stellar Objects are identified by their emission line spectra and near-infrared excess. The color-color diagram of the detected sources allows a detailed investigation of the slope of the near-infrared extinction law towards W3 Main. Analysis of the Hertzsprung Russell diagram suggests that the Nishiyama extinction law fits the stellar population of W3 Main best (E(J-H)/E(H-Ks) = 1.76 and R_(Ks) = 1.44). From our spectrophotometric analysis of the massive stars and the nature of their surrounding HII regions we derive the evolutionary sequence of W3 Main and we find evidence of an age spread of at least 2-3 Myr. While the most massive star (IRS2) is already evolved, indications for high-mass pre-main-sequence evolution is found for another star (IRS N1), deeply embedded in an ultra compact HII region, in line with the different evolutionary phases observed in the corresponding HII regions. We derive a stellar mass of W3 Main of (4 +- 1) 10^3 Msun, by extrapolating from the number of OB stars using a Kroupa IMF and correcting for our spectroscopic incompleteness. We have detected the photospheres of OB stars from the more evolved diffuse HII region to the much younger UCHII regions, suggesting that these stars have finished their formation and cleared away their circumstellar disks very fast. Only in the hyper-compact HII region (IRS5), the early type stars seem to be still surrounded by circumstellar material.
description: Accepted by ApJ, 14 pages, 4 figures
Instructions to install and configure a clone of the Sci-GaIA Open Access Repository
Creators: name: Barbera, R
name: Ricceri, R
name: Torrisi, M
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: This document includes the link to the instructions to install and configure the virtual appliance containing a clone of the Sci-GaIA Open Access Repository. The virtual appliance is available at http://oar.sci-gaia.eu/record/19.
Accretion of the Magellanic system onto the Galaxy
Creators: name: Nichols, Matthew
name: Colless, James
name: Colless, Matthew
name: Bland-Hawthorn, Joss
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Our Galaxy is surrounded by a large family of dwarf galaxies of which the most massive are the Large and Small Magellanic Clouds (LMC and SMC). Recent evidence suggests that systems with the mass of the Local Group accrete galaxies in smaller groups rather than individually. If so, at least some of the Galaxy's dwarfs may have fallen in with the LMC and SMC, and were formed as part of the Magellanic system in the nearby universe. We use the latest measurements of the proper motions of the LMC and SMC and a multicomponent model of the Galactic potential to explore the evolution of these galaxy configurations under the assumption that the Magellanic system may once have contained a number of bound dwarf galaxies. We compare our results to the available kinematic data for the local dwarf galaxies, and examine whether this model can account for recently discovered stellar streams and the planar distribution of Milky Way satellites. We find that in situations where the LMC and SMC are bound to the Milky Way, the kinematics of Draco, Sculptor, Sextans, Ursa Minor and the Sagittarius Stream are consistent with having fallen in along with the Magellanic system. These dwarfs, if so associated, will likely have been close to the tidal radius of the LMC originally and are unlikely to have affected each other throughout the orbit. However there are clear cases, such as Carina and Leo I, that cannot be explained this way
description: 13 pages, 7 figure, ApJ accepted
An affordable 3D-printed Solar Radiation Shield for Weather Stations
Creators: name: Pehrson, B
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: We report on an effort evaluating the use of 3D-printing in the design of weather station components. The first component studied is a solar irradation shield in the shape of a pagoda to be evaluated in the WIMEA-ICT project designing an affordable automated weather station for rural Africa. The design environment is based on open source software (OpenSCAD/Cura) and a 3D-printer in the 2000 EUR range, Ultimaker 2. Our conclusions are that 3D-printing is still much of an art but yet a powerful tool for prototyping before going to large volume production. The resulting files have been made available under a Creative Common license in the Sci-GaIA Open Access Repository. You are very welcome to print a few copies and join the evaluation activities. OpenSCAD and stereo-lithography files can be found at these links: https://oar.sci-gaia.eu/record/29, https://oar.sci-gaia.eu/record/30, https://oar.sci-gaia.eu/record/31, https://oar.sci-gaia.eu/record/32, https://oar.sci-gaia.eu/record/33, https://oar.sci-gaia.eu/record/34.
The Heads and Tails of Buoyant Autocatalytic Balls
Creators: name: Rogers, Michael C.
name: Morris, Stephen W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Buoyancy produced by autocatalytic reaction fronts can produce fluid flows that advect the front position, giving rise to interesting feedback between chemical and hydrodynamic effects. In a large diameter, extended cylinder that is relatively free of boundary constraints, localized initiation of an iodate-arsenous acid (IAA) reaction front on the bottom boundary generates a rising autocatalytic plume. Such plumes have several differences from their non-reactive counterparts. Using numerical simulation, we have found that if reaction is initiated using a spherical ball of product solution well above the bottom boundary, the subsequent flow can evolve much like an autocatalytic plume: the ball develops a reacting head and tail that is akin to the head and conduit of an autocatalytic plume, except that the tail is disconnected from the boundary. In the limit of large initial autocatalytic balls, however, growth of a reacting tail is suppressed and the resemblance to plumes disappears. Conversely, very small balls of product solution fail to initiate sustained fronts and eventually disappear.
description: Submitted to CHAOS
Challenges of Producing Software Bill Of Materials for Java
Creators: name: Balliu, Musard
name: Baudry, Benoit
name: Bobadilla, Sofia
name: Ekstedt, Mathias
name: Monperrus, Martin
name: Ron, Javier
name: Sharma, Aman
name: Skoglund, Gabriel
name: Soto-Valero, César
name: Wittlinger, Martin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Software bills of materials (SBOM) promise to become the backbone of software supply chain hardening. We deep-dive into 6 tools and the accuracy of the SBOMs they produce for complex open-source Java projects. Our novel insights reveal some hard challenges for the accurate production and usage of SBOMs.
Mobile Payment Und Crm - Entwicklung Eines Prototyps
Creators: name: Kaiser Christian
name: Marfurt Konrad
Publisher: name: Zenodo
Year: 2013
Subjects: mobile payment
crm

description: Der Beitrag zur wissenschaftlichen Fachtagung des AKWI 2013 an der technischen Hochschule Mittelhessen diskutiert die Entwicklung eines Mobile-Payment-Prototyps zur Beantwortung der Forschungsfrage "Welche Eigenschaften und Funktionen muss ein Mobile Payment System besitzen, um eine hohe Akzeptanz beim Kunden zu erreichen?".
Adolescent substance use in a southern Alberta community
Creators: name: Kramer, Lea Nicoll, (Lea Evelyn Nicoll), 1952-
Publisher: name: University of Calgary
Year: 1984
Subjects: subject: HV 4999 Y68 K72 1986
subject: Youth - Substance abuse
subject: Substance abuse - Alberta
subject: Social work with youth

description: Bibliography: p. 172-184.
Entanglement of observables: Quantum conditional probability approach
Creators: name: Khrennikov, Andrei
name: Basieva, Irina
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper is devoted to clarification of the notion of entanglement through decoupling it from the tensor product structure and treating as a constraint posed by probabilistic dependence of quantum observable A and B. In our framework, it is meaningless to speak about entanglement without pointing to the fixed observables A and B, so this is AB-entanglement. Dependence of quantum observables is formalized as non-coincidence of conditional probabilities. Starting with this probabilistic definition, we achieve the Hilbert space characterization of the AB-entangled states as amplitude non-factorisable states. In the tensor product case, $AB$-entanglement implies standard entanglement, but not vice verse. AB-entanglement for dichotomous observables is equivalent to their correlation. We describe the class of quantum states that are A_u B_u-entangled for a family of unitary operators (u). Finally, observables entanglement is compared with dependence of random variables in classical probability theory.
Malware Detection Module using Machine Learning Algorithms to Assist in Centralized Security in Enterprise Networks
Creators: name: Singhal, Priyank
name: Raul, Nataasha
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Malicious software is abundant in a world of innumerable computer users, who are constantly faced with these threats from various sources like the internet, local networks and portable drives. Malware is potentially low to high risk and can cause systems to function incorrectly, steal data and even crash. Malware may be executable or system library files in the form of viruses, worms, Trojans, all aimed at breaching the security of the system and compromising user privacy. Typically, anti-virus software is based on a signature definition system which keeps updating from the internet and thus keeping track of known viruses. While this may be sufficient for home-users, a security risk from a new virus could threaten an entire enterprise network. This paper proposes a new and more sophisticated antivirus engine that can not only scan files, but also build knowledge and detect files as potential viruses. This is done by extracting system API calls made by various normal and harmful executable, and using machine learning algorithms to classify and hence, rank files on a scale of security risk. While such a system is processor heavy, it is very effective when used centrally to protect an enterprise network which maybe more prone to such threats.
description: 6 pages
Concept note: Technology Transfer Alliance Collaboration Platform
Creators: name: Barbera, R.
name: Pehrson, B.
Publisher: name: Sci-GaIA Open Access Repository
Year: 2014

description: The TTA Collaboration Platform is intended to be a web-based platfor containing an integrated set of tools, applications, data repositories that are accessed via a portal: the TTA Portal. The motivation of developing this platform is to support collaboration and training and to foster education among the partners, sharing of all sorts of resources and dissemination of results.
On the excess of ultra-high energy cosmic rays in the direction of Centaurus A
Creators: name: Liu, Ruo-Yu
name: Wang, Xiang-Yu
name: Wang, Wei
name: Taylor, A. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A posteriori anisotropy study of ultra-high energy cosmic rays (UHECRs) with the Pierre Auger Observatory (PAO) has shown evidence of excess of cosmic ray particles above 55 EeV within $18^{\circ}$ of the direction of the radio galaxy Centaurus A. However, the origin of the excess remains elusive. We simulate the propagation of different species of particles coming from the direction of Centaurus A in the Galactic magnetic fields, and find that only particles of nuclear charge $Z\la 10$ can avoid being deflected outside of the $18^{\circ}$ window of Centaurus A. On the other hand, considering the increasingly heavy composition of UHECRs at the highest energies measured by PAO, a plausible scenario for cosmic rays from the direction of Centaurus A can be found if they consist of intermediate-mass nuclei. The chemical composition of cosmic rays can be further constrained by lower-energy cosmic rays of the same rigidity. We find that cosmic ray acceleration in the lobes of Centaurus A is not favored, while acceleration in the stellar winds that are rich in intermediate-mass nuclei, could meet the requirement. This suggests that the observed excess may originate from cosmic ray accelerators induced by stellar explosions in the star-forming regions of Centaurus A and/or the Centaurus cluster located behind Centaurus A.
description: 9 pages, 6 figures, 1 table; ApJ accepted
Higher-order correlations between different moments of two flow amplitudes in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The correlations between different moments of two flow amplitudes, extracted with the recently developed asymmetric cumulants, are measured in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector at the CERN Large Hadron Collider. The magnitudes of the measured observables show a dependence on the different moments as well as on the collision centrality, indicating the presence of non-linear response in all even moments up to the eighth. Furthermore, the higher-order asymmetric cumulants show different signatures than the symmetric and lower-order asymmetric cumulants. Comparisons with state-of-the-art event generators using two different parametrizations obtained from Bayesian optimization show differences between data and simulations in many of the studied observables, indicating a need for further tuning of the models behind those event generators. These results provide new and independent constraints on the initial conditions and transport properties of the system created in heavy-ion collisions.
description: 27 pages, 9 captioned figures, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/9210
Limitation in thin-film detection with transmission-mode terahertz time-domain spectroscopy
Creators: name: Withayachumnankul, Withawat
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In transmission-mode terahertz time-domain spectroscopy (THz-TDS), the thickness of a sample is a critical factor that determines an amount of the interaction between terahertz waves and bulk material. If the interaction length is too small, a change in the transmitted signal is overwhelmed by fluctuations and noise in the system. In this case, the sample can no longer be detected. This article presents a criterion to determine the lower thickness boundary of a free-standing film that can still be detectable by free-space transmission-mode THz-TDS. The rigorous analysis yields a simple proportional relation between the sample optical length and the system SNR. The proposed criterion can help to decide whether an alternative terahertz thin-film sensing modality is necessary.
description: 5 pages, 1 figure
Inferring astrophysical neutrino sources from the Glashow resonance
Creators: name: Huang, Guo-yuan
name: Lindner, Manfred
name: Volmer, Nele
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We infer the ultrahigh energy neutrino source by using the Glashow resonance candidate event recently identified by the IceCube Observatory. For the calculation of the cross section for the Glashow resonance, we incorporate both the atomic Doppler broadening effect and initial state radiation $\overlineν^{}_{e} e^- \to W^- γ$, which correct the original cross section considerably. Using available experimental information, we have set a generic constraint on the $\overlineν^{}_{e}$ fraction of astrophysical neutrinos, which excludes the $μ$-damped ${\rm p}γ$ source around $2σ$ confidence level under the assumption that neutrino production is dominated by the $Δ$-resonance. While a weak preference has been found for the pp source, next-generation measurements will be able to distinguish between ideal pp and p$γ$ sources with a high significance assuming an optimistic single power-law neutrino spectrum. The inclusion of multi-pion production at very high energies for the neutrino source can weaken the discrimination power. In this case additional multimessenger information is needed to distinguish between pp and p$γ$ sources.
description: 16 pages, 4 figures, version published in JHEP
Cetacean monitoring in the Mariana Islands Range Complex, 2015
Creators: name: Hill, Marie C. (Marie Chapla)
name: Oleson, Erin M. (Erin Marie), ǂd 1977-
name: Baumann-Pickering, Simone
name: Van Cise, Amy M.
name: Ligon, Allan D.
name: Bendlin, Andrea R.
name: Ü, Adam C.
name: Trickey, Jennifer S.
name: Bradford, Amanda L.
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center
Year: 2016
Subjects: subject: Cetacea--Monitoring--Mariana Islands.

description: This report includes a summary of the most recent visual surveys that were conducted in the winter (February–March) and summer (August–September) of 2015, the movements of a false killer whale (Pseudorca crassidens) that were satellite tagged during the PIFSC Mariana Archipelago Cetacean Survey in May–June, 2015, the results of nuclear and mitochondrial analysis of short-finned pilot whale samples collected during small-boat surveys of the southernmost Mariana islands (2011–2014), and analysis of beaked whale occurrence long-term passive acoustic data set for 2014–15. Analyses of acoustic data for baleen whales are still underway and will be reported at a later time.
Cosmic muons as PMT and SiPM detector background signals
Creators: name: Raki, Gholamreza Fardipour
name: Khakzad, Mohsen
name: AbdusSalam, Shehu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Photomultiplier tube (PMT) and Silicon Photo Multiplier (SiPM) are often used for detecting small number of photons or very weak radiations. A light guide usually connects these photodetectors to the test space. In this article, we investigate the effect of background signals caused by cosmic muons scintillation or interactions with PMT and SiPM, their light guide or input window materials. We study such interactions by making simulations using GATE software package and undertaking experiments using detector circuits developed as in~\cite{Raki:2022lwn}. The background cosmic muons can generate photons which will lead to errors in low radiation and single photon detection experiments especially if standard scintillators are not used. For such experiments, we conclude that the most useful method for cutting down the cosmic muons background should be by conducting the experiments deep underground or inside tunnels with several tens of meters of materials above it.
description: v3: heavily revamped. the previous version was submitted without the consent of S.A
Regularization Techniques for PSF-Matching Kernels. I. Choice of Kernel Basis
Creators: name: Becker, A. C.
name: Homrighausen, D.
name: Connolly, A. J.
name: Genovese, C. R.
name: Owen, R.
name: Bickerton, S. J.
name: Lupton, R. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We review current methods for building PSF-matching kernels for the purposes of image subtraction or coaddition. Such methods use a linear decomposition of the kernel on a series of basis functions. The correct choice of these basis functions is fundamental to the efficiency and effectiveness of the matching - the chosen bases should represent the underlying signal using a reasonably small number of shapes, and/or have a minimum number of user-adjustable tuning parameters. We examine methods whose bases comprise multiple Gauss-Hermite polynomials, as well as a form free basis composed of delta-functions. Kernels derived from delta-functions are unsurprisingly shown to be more expressive; they are able to take more general shapes and perform better in situations where sum-of-Gaussian methods are known to fail. However, due to its many degrees of freedom (the maximum number allowed by the kernel size) this basis tends to overfit the problem, and yields noisy kernels having large variance. We introduce a new technique to regularize these delta-function kernel solutions, which bridges the gap between the generality of delta-function kernels, and the compactness of sum-of-Gaussian kernels. Through this regularization we are able to create general kernel solutions that represent the intrinsic shape of the PSF-matching kernel with only one degree of freedom, the strength of the regularization lambda. The role of lambda is effectively to exchange variance in the resulting difference image with variance in the kernel itself. We examine considerations in choosing the value of lambda, including statistical risk estimators and the ability of the solution to predict solutions for adjacent areas. Both of these suggest moderate strengths of lambda between 0.1 and 1.0, although this optimization is likely dataset dependent.
description: Submitted to MNRAS; 5 figures
Length-weight relationships for 73 species and species groups as reported in the 2011-2013 national bycatch reports for pelagic longline fisheries in Hawaii and American Samoa
Creators: name: Curran, Daniel S.
name: Bigelow, Keith
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center
Year: 2016
Subjects: subject: Longlining (Fisheries)--Bycatches--Hawaii--Statistics.
subject: Pelagic fishes--Hawaii--Weight--Statistics.

description: This report provides summaries of length-weight relationships for pelagic species reported in the Hawaii and American Samoa based longline fisheries. NOAA periodically produces a National Bycatch Report (NBR) estimating total weight by species or species group for all species taken by these fisheries. Past reports have utilized both unpublished and published estimates of lengthweight relationships to apply an average weight for an individual of each species to the total number reported in a fishery. The data sources used to generate the length-weight regression coefficients necessary to convert average length of a species (from observer collected length frequency data) have not been well documented. This report provides documentation on the data sources, sample sizes, size ranges, and assumptions used to generate the length-to-weight conversion equations for each species/species group as reported in the NBR report for 2011– 2013 catch estimates. This report does not reflect any new regression analyses, it is an attempt at documentation of where the regression coefficients used in the NBR summaries originated.
Satellite Dynamics Toolbox Library: a tool to model multi-body space systems for robust control synthesis and analysis
Creators: name: Sanfedino, Francesco
name: Alazard, Daniel
name: Kassarian, Ervan
name: Somers, Franca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The level of maturity reached by robust control theory techniques nowadays contributes to a considerable minimization of the development time of an end-to-end control design of a spacecraft system. The advantage offered by this framework is twofold: all system uncertainties can be included from the very beginning of the design process; the validation and verification (V\&V) process is improved by fast detection of worst-case configurations that could escape to a classical sample-based Monte Carlo simulation campaign. Before proceeding to the control synthesis and analysis, a proper uncertain plant model has to be available in order to push these techniques to their limits of performance. In this spirit, the Satellite Dynamics Toolbox Library (SDTlib) offers many features to model a spacecraft system in a multi-body fashion on SIMULINK. Parametric models can be easily built in a Linear Fractional Transformation (LFT) form by including uncertainties and varying parameters with minimal number of repetitions. Uncertain Linear Time Invariant (LTI) and uncertain Linear Parameter-Varying (LPV) controllers can then be synthesized and analyzed in a straightforward way. The authors present in this article a tutorial, that can be downloaded at https://nextcloud.isae.fr/index.php/s/XDfRfHntejHTmmp, to show how to deal with an end-to-end robust design of a spacecraft mission and to provide to researchers a benchmark to test their own algorithms.