cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The tidal filament of NGC 4660
Creators: name: Kemp, S. N.
name: Martinez-Robles, C.
name: Marquez-Lugo, R. A.
name: Zepeda-Garcia, D.
name: Franco-Hernandez, R.
name: Nigoche-Netro, A.
name: Ramos-Larios, G.
name: Navarro, S. G.
name: Corral, L. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: NGC 4660, in the Virgo cluster, is a well-studied elliptical galaxy which has a strong disk component (D/T about 0.2-0.3). The central regions including the disk component have stellar populations with ages about 12-13 Gyr from SAURON studies. However we report the discovery of a long narrow tidal filament associated with the galaxy in deep co-added Schmidt plate images and deep CCD frames, implying that the galaxy has undergone a tidal interaction and merger within the last few Gyr. The relative narrowness of the filament implies a wet merger with at least one spiral galaxy involved, but the current state of the system has little evidence for this. However a 2-component photometric fit using GALFIT shows much bluer B-V colours for the disk component than for the elliptical component, which may represent a residual trace of enhanced star formation in the disk caused by the interaction 1-2 Gyr ago. There are brighter concentrations within the filament which resemble Tidal Dwarf Galaxies, although they are at least 40 times fainter. These may represent faint, evolved versions of these galaxies. A previously detected stripped satellite galaxy south of the nucleus is seen in our residual image and may imply that the filament is a tidal stream produced by perigalactic passages of this satellite.
description: 32 pages, 9 figures (1 in color, 8 B&W), 1 table, ApJ 2016
Orbital and spin order in oxide two-dimensional electron gases
Creators: name: Tolsma, John R.
name: Polini, Marco
name: MacDonald, Allan H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We describe a variational theory of multi-band two-dimensional electron gases that captures the interplay between electrostatic confining potentials, orbital-dependent interlayer electronic hopping and electron-electron interactions, and apply it to the d-band two-dimensional electron gases that form near perovskite oxide surfaces and heterojunctions. These multi-band two-dimensional electron gases are prone to the formation of Coulomb-interaction-driven orbitally-ordered nematic ground-states. We find that as the electron density is lowered and interaction effects strengthen, spontaneous orbital order occurs first, followed by spin order. We compare our results with known properties of single-component two-dimensional electron gas systems and comment on closely related physics in semiconductor quantum wells and van der Waals heterostructures.
description: 15+1 pages, 5 figures
An analytical solution in the complex plane for the luminosity distance in flat cosmology
Creators: name: Zaninetti, L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present an analytical solution for the luminosity distance in spatially flat cosmology with pressureless matter and the cosmological constant. The complex analytical solution is made of a real part and a negligible imaginary part. The real part of the luminosity distance allows finding the two parameters $H_0$ and $\om$. A simple expression for the distance modulus for SNs of type Ia is reported in the framework of the minimax approximation.
description: 6 pages, 2 figures
Verifying quantum superpositions at metre scales
Creators: name: Stamper-Kurn, Dan M.
name: Marti, G. Edward
name: Müller, Holger
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: While the existence of quantum superpositions of massive particles over microscopic separations has been established since the birth of quantum mechanics, the maintenance of superposition states over macroscopic separations is a subject of modern experimental tests. In Ref. [1], T. Kovachy et al. report on applying optical pulses to place a freely falling Bose-Einstein condensate into a superposition of two trajectories that separate by an impressive distance of 54 cm before being redirected toward one another. When the trajectories overlap, a final optical pulse produces interference with high contrast, but with random phase, between the two wave packets. Contrary to claims made in Ref. [1], we argue that the observed interference is consistent with, but does not prove, that the spatially separated atomic ensembles were in a quantum superposition state. Therefore, the persistence of such superposition states remains experimentally unestablished.
description: Comment on Kovachy et al., "Quantum superposition at the half-metre scale," Nature 528, 530 (2015); see also reply by Kovachy et al., arXiv:1607.03485
Perturbations of ultralight vector field dark matter
Creators: name: Cembranos, J. A. R.
name: Maroto, A. L.
name: Jareño, S. J. Núñez
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the dynamics of cosmological perturbations in models of dark matter based on ultralight coherent vector fields. Very much as for scalar field dark matter, we find two different regimes in the evolution: for modes with $k^2\ll {\cal H}ma$, we have a particle-like behaviour indistinguishable from cold dark matter, whereas for modes with $k^2\gg {\cal H}ma$, we get a wave-like behaviour in which the sound speed is non-vanishing and of order $c_s^2\simeq k^2/m^2a^2$. This implies that, also in these models, structure formation could be suppressed on small scales. However, unlike the scalar case, the fact that the background evolution contains a non-vanishing homogeneous vector field implies that, in general, the evolution of the three kinds of perturbations (scalar, vector and tensor) can no longer be decoupled at the linear level. More specifically, in the particle regime, the three types of perturbations are actually decoupled, whereas in the wave regime, the three vector field perturbations generate one scalar-tensor and two vector-tensor perturbations in the metric. Also in the wave regime, we find that a non-vanishing anisotropic stress is present in the perturbed energy-momentum tensor giving rise to a gravitational slip of order $(Φ-Ψ)/Φ\sim c_s^2$. Moreover in this regime the amplitude of the tensor to scalar ratio of the scalar-tensor modes is also $h/Φ\sim c_s^2$. This implies that small-scale density perturbations are necessarily associated to the presence of gravity waves in this model. We compare their spectrum with the sensitivity of present and future gravity waves detectors.
description: 18 pages, 6 figures
Effects on a Landau-type system for a neutral particle with no permanent electric dipole moment subject to the Kratzer potential in a rotating frame
Creators: name: Oliveira, Abinael B.
name: Bakke, Knut
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The behaviour of a neutral particle (atom, molecule) with an induced electric dipole moment in a region with a uniform effective magnetic field under the influence of the Kratzer potential [A. Kratzer, Z. Phys. 3, 289 (1920)] and rotating effects is analysed. It is shown that the degeneracy of the Landau-type levels is broken and the angular frequency of the system acquires a new contribution that stems from the rotation effects. Moreover, in the search for bound states solutions, then, it is shown that the possible values of this angular frequency of the system are determined by the quantum numbers associated with the radial modes and the angular momentum, the angular velocity of the rotating frame and by the parameters associated with the Kratzer potential.
description: 14 pages
Few-body collective excitations beyond Kohn's theorem in quantum Hall systems
Creators: name: Wooten, R. E.
name: Yan, B.
name: Greene, Chris H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A relative coordinate breathing mode in the quantum Hall system is predicted to exist with different behavior under either Coulomb or dipole-dipole interactions. While Kohn's theorem predicts that any relative coordinate interaction will fail to alter the center of mass energy spectrum, it can affect excitations in the relative coordinates. One such collective excitation, which we call the hyperradial breathing mode, emerges naturally from a few-body, hyperspherical representation of the problem and depends on the inter-particle interactions, the ground state wave function, and the number of particles participating in the excitation. Possible observations of this excitation will be discussed in the context of both cold rotating atomic simulations and conventional quantum Hall experiments.
description: 2 figures
LABOUR DYNAMICS IN THE INFORMAL SECTOR: EVIDENCE FROM ZIMBABWE'S URBAN METAL INDUSTRY
Creators: name: Tendai, Joseph Moyo
name: Alice, Nomsa Ndlovu
Publisher: name: TOP Journal
Year: 2024
Subjects: Informal sector, Economic structural adjustment program (ESAP), Zimbabwe, Economic crisis, Employment opportunities

description: The informal sector plays a vital role in the economic development of many countries, particularly in job creation, income generation, and poverty alleviation. In Zimbabwe, the informal sector has experienced significant growth, fueled by economic challenges such as the structural adjustment program (ESAP) and subsequent crises. ESAP led to job losses in both the public and private sectors, while the recent economic and political crisis saw a decline in formal employment opportunities and plummeting real wages due to hyperinflation. Consequently, the expansion of Zimbabwe's informal sector can be attributed to the increasing need to supplement formal incomes amidst dwindling employment prospects. This review examines the dynamics of Zimbabwe's informal sector, exploring its evolution in response to economic changes and its implications for livelihoods and economic resilience
Finding bars in MaNGA galaxies with Galaxy Zoo: 3D
Creators: name: Masters, Karen L
Publisher: name: Zenodo
Year: 2023
Subjects: galaxies, bars, citizen science

description: Mapping Nearby Galaxies at Apache Point Observatory (MaNGA, part of the fourth incarnation of the Sloan Digital Sky Surveys or SDSS-IV), has obtained spatially resolved spectral maps for 10,010 nearby galaxies selected from the SDSS Main Galaxy Sample. Many results from MaNGA have collapsed this structure into azimuthally averaged radial gradients, or symmetric 2D shapes, but there is significantly more information about the effect internal structures have on the evolution of galaxies available if we can identify different internal structures. One of the simplest ways to identify irregular internal structures in galaxies is by visual inspection. By employing a citizen science technique to ask this question of N independent volunteers we have obtained quantitatively robust masks (and errors) for spirals and bars in MaNGA target galaxies, in a project we call Galaxy Zoo: 3D (Masters et al. 2021). In addition to internal features GZ:3D asked users to identify foreground stars and foreground/background galaxies. I review this project, provide a guide on how to make use of the results, hi-light some already published, or in progress projects making use of them, with a particular focus on results related to bars. In particular I show some early results on the excess stellar surface mass density in bars compared to non-bar disc at the same radius.
description: {"references": ["Masters et al. (2021)", "Sanchez et al. (2016)"]}
Search for substellar-mass companions and asymmetries in their parent discs
Creators: name: Willson, M.
name: Kraus, S.
name: Kluska, J.
name: Monnier, J. D.
name: Ireland, M.
name: Aarnio, A.
name: Sitko, M. L.
name: Calvet, N.
name: Espaillat, C.
name: Wilner, D. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Transitional discs are a class of circumstellar discs around young stars with extensive clearing of dusty material within their inner regions on 10s of au scales. One of the primary candidates for this kind of clearing is the formation of planet(s) within the disc that then accrete or clear their immediate area as they migrate through the disc. Our sample included eight transitional discs. Using the Keck/NIRC2 instrument we utilised the Sparse Aperture Masking (SAM) interferometry technique to search for asymmetries indicative of ongoing planet formation. We searched for close-in companions using both model fitting and interferometric image reconstruction techniques. Using simulated data, we derived diagnostics that helped us to distinguish between point sources and extended asymmetric disc emission. In addition, we investigated the degeneracy between the contrast and separation that appear for marginally resolved companions. We found FP Tau to contain a previously unseen disc wall, and DM Tau, LkHa 330, and TW Hya to contain an asymmetric signal indicative of point source-like emission. We placed upper limits on the contrast of a companion in RXJ1842.9-3532 and V2246 Oph. We ruled the asymmetry signal in RXJ1615.3-3255 and V2062 Oph to be false positives. In the cases where our data indicated a potential companion we computed estimates for the value of $M_c \dot M_c$ and found values in the range of $10^{-5} - 10^{-3} M^2_J yr^{-1}$. We found significant asymmetries in four targets. Of these, three were consistent with companions. We resolved a previously unseen gap in the disc of FP Tau extending inwards from approximately 10 au.
description: 14 pages, 12 figures, A&A, accepted
Dual-Comb Coherent Raman Spectroscopy with Lasers of 1-GHz Pulse Repetition Frequency
Creators: name: Mohler, Kathrin J.
name: Bohn, Bernhard J.
name: Yan, Ming
name: Hänsch, Theodor W.
name: Picqué, Nathalie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We extend the technique of multiplex coherent Raman spectroscopy with two femtosecond mode-locked lasers to oscillators of a pulse repetition frequency of 1 GHz. We demonstrate spectra of liquids, which span 1100 cm$^{-1}$ of Raman shifts. At a resolution of 6 cm$^{-1}$, their measurement time may be as short as 5 microseconds for a refresh rate of 2 kHz. The waiting period between acquisitions is improved ten-fold compared to previous experiments with two lasers of 100-MHz repetition frequencies.
description: 8 pages, 6 figures
Adiabatic fission barriers in superheavy nuclei
Creators: name: Jachimowicz, P.
name: Kowal, M.
name: Skalski, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using the microscopic-macroscopic model based on the deformed Woods-Saxon single-particle potential and the Yukawa-plus-exponential macroscopic energy we calculated static fission barriers $B_{f}$ for 1305 heavy and superheavy nuclei $98\leq Z \leq 126$, including even - even, odd - even, even - odd and odd - odd systems. For odd and odd-odd nuclei, adiabatic potential energy surfaces were calculated by a minimization over configurations with one blocked neutron or/and proton on a level from the 10-th below to the 10-th above the Fermi level. The parameters of the model that have been fixed previously by a fit to masses of even-even heavy nuclei were kept unchanged. A search for saddle points has been performed by the "Imaginary Water Flow" method on a basic five-dimensional deformation grid, including triaxiality. Two auxiliary grids were used for checking the effects of the mass asymmetry and hexadecapole non-axiallity. The ground states were found by energy minimization over configurations and deformations. We find that the non-axiallity significantly changes first and second fission barrier in many nuclei. The effect of the mass - asymmetry, known to lower the second, very deformed barriers in actinides, in the heaviest nuclei appears at the less deformed saddles in more than 100 nuclei. It happens for those saddles in which the triaxiallity does not play any role, what suggests a decoupling between effects of the mass-asymmetry and triaxiality. We studied also the influence of the pairing interaction strength on the staggering of $B_f$ for odd- and even-particle numbers. Finally, we provide a comparison of our results with other theoretical fission barrier evaluations and with available experimental estimates.
description: submitted to PRC
Matter Neutrino Resonance Transitions above a Neutron Star Merger Remnant
Creators: name: Zhu, Yong-Lin
name: Perego, Albino
name: McLaughlin, Gail C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Matter-Neutrino Resonance (MNR) phenomenon has the potential to significantly alter the flavor content of neutrinos emitted from compact object mergers. We present the first calculations of MNR transitions using neutrino self interaction potentials and matter potentials generated selfconsistently from a dynamical model of a three-dimensional neutron star merger. In the context of the single angle approximation, we find that Symmetric and Standard MNR transitions occur in both normal and inverted hierarchy scenarios. We examine the spatial regions above the merger remnant where propagating neutrinos will encounter the matter neutrino resonance and find that a significant fraction of the neutrinos are likely to undergo MNR transitions.
description: 13 pages, 11 figures
Degrees of deception: the effects of different types of COVID-19 misinformation and the effectiveness of corrective information in crisis times
Creators: name: Hameleers, Michael
name: Humprecht, Edda
name: Möller, Judith
name: Lühring, Jula
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
classificationCode: 69999
subject: Biological Sciences not elsewhere classified
subject: Science Policy
classificationCode: 111714
subject: Mental Health

description: Responding to widespread concerns about misinformation’s impact on democracy, we conducted an experiment in which we exposed German participants to different degrees of misinformation on COVID-19 connected to politicized (immigration) and apolitical (runners) issues (N = 1,490). Our key findings show that partially false information is more credible and persuasive than completely false information, and also more difficult to correct. People with congruent prior attitudes are more likely to perceive misinformation as credible and agree with its positions than people with incongruent prior attitudes. We further show that although fact-checkers can lower the perceived credibility of misinformation on both runners and migrants, corrective messages do not affect attitudes toward migrants. As a key contribution, we show that different degrees of misinformation can have different impacts: more nuanced deviations from facticity may be more harmful as they are difficult to detect and correct while being more credible.
Investigating the cause and effect factors of young children’s smartphone overuse: focusing on the influence of parenting factors
Creators: name: Lee, Ae Ri
name: Park, Yong Wan
name: Oh, Joohyun
Publisher: name: Taylor & Francis
Year: 2022
Subjects: classificationCode: 69999
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy

description: This research investigates the causal factors of smartphone overuse in young children, especially toddlers and preschoolers aged 1–6 years, including parenting style, efficacy, and stress, and parents’ smartphone overuse and the effect on children’ temperaments. Data were collected through a web-based survey in South Korea. Participants were smartphone users who had a child using a smartphone under six years. There were 357 responses in the sample. Roughly 80.4% of parents were in their 30s, and 46.5% of children were toddlers aged 1–3 years. We used structural equation modeling to investigate the relation between children’s smartphone overuse and parenting-related variables. Parenting style influences parenting efficacy, which decreases parenting stress and smartphone overuse among both parents and children. Parents’ smartphone overuse also influences children’s smartphone overuse. Young children’s smartphone overuse affects their activity, emotional sensitivity, and sociability. Finally, smartphone overuse and emotional sensitivity are higher in toddlers than preschoolers. Our results provide practical implications for the parents, government, and providers of content for young children. First, parents should delay their young children’s smart devices usage, watch together, and communicate when their young children use smart devices. Second, government should provide timely information about parenting. Finally, content providers should make content shorter and provide warnings to take breaks, and develop content that improves children’s activity and sociability, and tailoring content to particular age groups.
Electron Doping a Kagome Spin Liquid
Creators: name: Kelly, Z. A.
name: Gallagher, M. J.
name: McQueen, T. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Herbertsmithite, ZnCu$_3$(OH)$_6$Cl$_2$, is a two dimensional kagomé lattice realization of a spin liquid, with evidence for fractionalized excitations and a gapped ground state. Such a quantum spin liquid has been proposed to underlie high temperature superconductivity and is predicted to produce a wealth of new states, including a Dirac metal at $1/3$rd electron doping. Here we report the topochemical synthesis of electron-doped ZnLi$_x$Cu$_3$(OH)$_6$Cl$_2$ from $x$ = 0 to $x$ = 1.8 ($3/5$th per Cu$^{2+}$). Contrary to expectations, no metallicity or superconductivity is induced. Instead, we find a systematic suppression of magnetic behavior across the phase diagram. Our results demonstrate that significant theoretical work is needed to understand and predict the role of doping in magnetically frustrated narrow band insulators, particularly the interplay between local structural disorder and tendency toward electron localization, and pave the way for future studies of doped spin liquids.
The ALMaQUEST Survey X: What powers merger induced star formation?
Creators: name: Thorp, Mallory D.
name: Ellison, Sara L.
name: Pan, Hsi-An
name: Lin, Lihwai
name: Patton, David R.
name: Bluck, Asa F. L.
name: Walters, Dan
name: Scudder, Jillian M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxy mergers are known to trigger both extended and central star formation. However, what remains to be understood is whether this triggered star formation is facilitated by enhanced star formation efficiencies, or an abundance of molecular gas fuel. This work presents spatially resolved measurements of CO emission collected with the Atacama Large Millimetre Array (ALMA) for 20 merging galaxies (either pairs or post-mergers) selected from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. Eleven additional merging galaxies are selected from the ALMA MaNGA QUEnching and STar formation (ALMaQUEST) survey, resulting in a set of 31 mergers at various stages of interaction and covering a broad range of star formation rates (SFR). We investigate galaxy-to-galaxy variations in the resolved Kennicutt-Schmidt relation (rKS: $Σ_{H_2}$ vs. $Σ_{SFR}$), the resolved molecular gas main sequence (rMGMS: $Σ_{\star}$ vs. $Σ_{H_2}$), and the resolved star-forming main sequence (rSFMS: $Σ_{\star}$ vs. $Σ_{SFR}$). We quantify offsets from these resolved relations to determine if star formation rate, molecular gas fraction, and/or star formation efficiency (SFE) is enhanced in different regions of an individual galaxy. By comparing offsets in all three parameters we can discern whether gas fraction or SFE powers an enhanced $Σ_{SFR}$. We find that merger-induced star formation can be driven by a variety of mechanisms, both within a galaxy and between different mergers, regardless of interaction stage.
description: 28 pages, 28 figures, accepted for publication in MNRAS
Distributed-memory large deformation diffeomorphic 3D image registration
Creators: name: Mang, Andreas
name: Gholami, Amir
name: Biros, George
Publisher: name: arXiv
Year: 2016
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: D.1.3; I.4.3; G.1.8; F.2.1; G.1.0
subject: 68U10, 49J20, 35Q93, 65K10, 76D55, 90C20

description: We present a parallel distributed-memory algorithm for large deformation diffeomorphic registration of volumetric images that produces large isochoric deformations (locally volume preserving). Image registration is a key technology in medical image analysis. Our algorithm uses a partial differential equation constrained optimal control formulation. Finding the optimal deformation map requires the solution of a highly nonlinear problem that involves pseudo-differential operators, biharmonic operators, and pure advection operators both forward and back- ward in time. A key issue is the time to solution, which poses the demand for efficient optimization methods as well as an effective utilization of high performance computing resources. To address this problem we use a preconditioned, inexact, Gauss-Newton- Krylov solver. Our algorithm integrates several components: a spectral discretization in space, a semi-Lagrangian formulation in time, analytic adjoints, different regularization functionals (including volume-preserving ones), a spectral preconditioner, a highly optimized distributed Fast Fourier Transform, and a cubic interpolation scheme for the semi-Lagrangian time-stepping. We demonstrate the scalability of our algorithm on images with resolution of up to $1024^3$ on the "Maverick" and "Stampede" systems at the Texas Advanced Computing Center (TACC). The critical problem in the medical imaging application domain is strong scaling, that is, solving registration problems of a moderate size of $256^3$---a typical resolution for medical images. We are able to solve the registration problem for images of this size in less than five seconds on 64 x86 nodes of TACC's "Maverick" system.
description: accepted for publication at SC16 in Salt Lake City, Utah, USA; November 2016
Tensor power of dynamical maps and P- vs. CP-divisibility
Creators: name: Benatti, Fabio
name: Chruściński, Dariusz
name: Filippov, Sergey
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The are several non-equivalent notions of Markovian quantum evolution. In this paper we show that the one based on the so-called CP-divisibility of the corresponding dynamical map enjoys the following stability property: the dynamical map $Λ_t$ is CP-divisible iff the second tensor power $Λ_t\otimesΛ_t$ is CP-divisible as well. Moreover, the P-divisibility of the map $Λ_t\otimesΛ_t$ is equivalent to the CP-divisibility of the map $Λ_t$. Interestingly, the latter property is no longer true if we replace the P-divisibility of $Λ_t\otimesΛ_t$ by simple positivity and the CP-divisibility of $Λ_t$ by complete positivity. That is, unlike when $Λ_t$ has a time-independent generator, positivity of $Λ_t\otimesΛ_t$ does not imply complete positivity of $Λ_t$.
description: 5 pages
Uniaxial strain-induced Kohn anomaly and electron-phonon coupling in acoustic phonons of graphene
Creators: name: Cifuentes-Quintal, M. E.
name: de la Peña-Seaman, O.
name: Heid, R.
name: de Coss, R.
name: Bohnen, K. -P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recent advances in strain engineering at the nanoscale have shown the feasibility to modulate the properties of graphene. Although the electron-phonon (e-ph) coupling and Kohn anomalies in graphene define the phonon branches contributing to the resonance Raman scattering, and is relevant to the electronic and thermal transport as a scattering source, the evolution of the e-ph coupling as a function of strain has been less studied. In this work, the Kohn anomalies and the e-ph coupling in uniaxially strained graphene along armchair (AC) and zigzag (ZZ) directions were studied by means of density functional perturbation theory calculations. In addition to the phonon anomaly at the transversal optical (TO) phonon branch in the K point for pristine graphene, we found that uniaxial strain induces a discontinuity in the frequency derivative of the longitudinal acoustic (LA) phonon branch. This behavior corresponds to the emergence of a Kohn anomaly, as a consequence of a strain-enhanced e-ph coupling. Thus, the present results for uniaxially strained graphene contrast with the commonly assumed view that the e-ph coupling around the K point is only present in the TO phonon branch.
description: Accepted for publication in Physical Review B (12 July 2016)
Implementation of Data Mining on a Secure Cloud Computing over a Web API using Supervised Machine Learning Algorithm
Creators: name: Ige, Tosin
name: Adewale, Sikiru
Publisher: name: arXiv
Year: 2022
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Ever since the era of internet had ushered in cloud computing, there had been increase in the demand for the unlimited data available through cloud computing for data analysis, pattern recognition and technology advancement. With this also bring the problem of scalability, efficiency and security threat. This research paper focuses on how data can be dynamically mine in real time for pattern detection in a secure cloud computing environment using combination of decision tree algorithm and Random Forest over a restful Application Programming Interface (API). We are able to successfully Implement data mining on cloud computing bypassing or avoiding direct interaction with data warehouse and without any terminal involve by using combination of IBM Cloud storage facility, Amazing Web Service, Application Programming Interface and Window service along with a decision tree and Random Forest algorithm for our classifier. We were able to successfully bypass direct connection with the data warehouse and cloud terminal with 94% accuracy in our model.
description: 4 pages
Applying Chatbots to the Internet of Things: Opportunities and Architectural Elements
Creators: name: Kar, Rohan
name: Haldar, Rishin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Internet of Things (IoT) is emerging as a significant technology in shaping the future by connecting physical devices or things with internet. It also presents various opportunities for intersection of other technological trends which can allow it to become even more intelligent and efficient. In this paper we focus our attention on the integration of Intelligent Conversational Software Agents or Chatbots with IoT. Literature surveys have looked into various applications, features, underlying technologies and known challenges of IoT. On the other hand, Chatbots are being adopted in greater numbers due to major strides in development of platforms and frameworks. The novelty of this paper lies in the specific integration of Chatbots in the IoT scenario. We analyzed the shortcomings of existing IoT systems and put forward ways to tackle them by incorporating chatbots. A general architecture is proposed for implementing such a system, as well as platforms and frameworks, both commercial and open source, which allow for implementation of such systems. Identification of the newer challenges and possible future directions with this new integration, have also been addressed.
description: 9 pages, 3 figures, 5 Use Cases
Reading between the Lines: Process Mining on OPC UA Network Data
Creators: name: Hornsteiner, Markus
name: Empl, Philip
name: Bunghardt, Timo
name: Schönig, Stefan
Publisher: name: Universität Regensburg
Year: 2024
Subjects: subject: process mining; industrial IoT; business process management; industry 4.0
subject: 004 Informatik

description: The introduction of the Industrial Internet of Things (IIoT) has led to major changes in the
industry. Thanks to machine data, business process management methods and techniques could also
be applied to them. However, one data source has so far remained untouched: The network data of
the machines. In the business environment, process mining, for example, has already been carried
out based on network data, but the IIoT, with its particular protocols such as OPC UA, has yet to be
investigated. With the help of design science research and on the shoulders of CRISP-DM, we first
develop a framework for process mining in the IIoT in this paper. We then apply the framework to
real-world IIoT network traffic data and evaluate the outcome and performance of our approach in
detail. We find tremendous potential in network traffic data but also limitations. Among other things,
due to the dependence on process experts and the existence of case IDs.
Mapping the connections of health professionals to COVID-19 myths and facts in the Australian Twittersphere
Creators: name: O’Neil, Mathieu
name: Khan, Irfan
name: Holland, Kate
name: Cai, Xiaolan
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
classificationCode: 111714
subject: Mental Health

description: The spread of COVID-19 misinformation on social media has elicited concern amongst scholars, health agencies and governments owing to its potential harms to public health. This article addresses the question of how networks of Australian health professionals engaged with COVID-19 facts and myths on Twitter between August and October 2020. After reviewing selected literature on COVID-19 misinformation, we present our analytical choices and the methodology we used to constitute datasets of COVID-19 factual and mythical hashtags and of verified Australian health professional accounts (N:377). The article distinguishes between the capacities of ‘actor-actants’ and ‘issue-actants,’ and between the adoption of ‘field’ and ‘contested’ hashtags during a controversy. We identify categories of Australian health professional Twitter accounts such as GPs, nurses, specialists, public health professionals and researchers, and analyse the patterns of connections between these actor-actants and COVID-19 facts and myths. We find that these categories exhibit clearly distinct behaviour when tweeting or retweeting factual and mythical hashtags. Even though the rate of Australian health professionals’ connection with myths in comparison to facts on Twitter is low, hashtags such as #hydroxychloroquine attracted significant engagement. We examine these hashtags’ context and find that they were mainly being debunked, though a minority of accounts endorsed them. We analyse these adoption patterns, and critically assess the ‘echo chamber effect.’ We also consider public health and privacy implications for the dissemination of accurate information, for trust in health professionals during a pandemic, and for combatting misinformation.
Spying on photons with photons: quantum interference and information
Creators: name: Ataman, Stefan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The quest to have both which-path knowledge and interference fringes in a double-slit experiment dates back to the inception of quantum mechanics (QM) and to the famous Einstein-Bohr debates. In this paper we propose and discuss an experiment able to spy on one photon's path with another photon. We modify the quantum state inside the interferometer as opposed to the traditional physical modification of the "wave-like" or "particle-like" experimental setup. We are able to show that it is the ability to harvest or not which-path information that finally limits the visibility of the interference pattern and not the "wave-like" or "particle-like" experimental setups. Remarkably, a full "particle-like" experimental setup is able to show interference fringes with 100 % visibility if the quantum state is carefully engineered.
description: 6 pages, 4 figures, to appear in EPJD
Divide and conquer m-scripts
Creators: name: Karakuzu, Agah
Publisher: name: Zenodo
Year: 2020
Subjects: matlab, ohbm, hackathon, brainhack, octave, CI, CD, binder, docker, github

description: Prepared for good coding practices in MATLAB, to be presented in https://ohbm.github.io/hackathon2020/ Associated repository: https://github.com/agahkarakuzu/eda_organized Associated data repo: https://osf.io/pkqts/
ANALYZING THE IMPACT OF BANK CAPITALIZATION ON PROFITABILITY IN NIGERIA
Creators: name: Adeola, Ogunjimi
Publisher: name: TOP Journal
Year: 2024
Subjects: Bank profitability, commercial banks, recapitalization, market power, Nigeria

description: The profitability of commercial banks is of paramount importance to the overall health and vitality of an economy. This study delves into the determinants of bank profitability in Nigeria, particularly after a significant round of bank recapitalization in 2005. We address key questions regarding the factors influencing bank profitability in the post-recapitalization era and assess the impact of market power on bank returns. Through empirical analysis, we identify the driving forces behind profitability in Nigeria's commercial banks and examine the relative significance of market power among these determinants. Our findings offer valuable insights for policymakers and stakeholders in fostering a robust financial sector that can effectively support economic growth
Генеральный груз как основа морской транспортной системы в регионе Восточного Средиземноморья 3-2 тыс. до н.э.
Creators: name: Маняшин, Александр
Publisher: name: ООО Цифра
Year: 2023
Subjects: general cargo
sea freight transport
logistics systems
генеральные грузы
морские грузоперевозки
логистические системы

description: Международный научно-исследовательский журнал, Выпуск 9 (135) 2023
Merger Hydrodynamics of the Luminous Cluster RXJ1347.5-1145
Creators: name: Kreisch, C. D.
name: Machacek, M. E.
name: Jones, C.
name: Randall, S. W.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of the complex gas hydrodynamics in the X-ray luminous galaxy cluster RXJ1347.5-1145 caught in the act of merging with a subcluster to its southeast using a combined $186$ ks Chandra exposure, $2.5$ times greater than previous analyses. The primary cluster hosts a sloshing cold front spiral traced by four surface brightness edges $5.^{\prime \prime}85^{+0.04}_{-0.03}$ west, $7.^{\prime \prime}10^{+0.07}_{-0.03}$ southeast, $11.^{\prime \prime}5^{+1.3}_{-1.2}$ east, and $16.^{\prime \prime}7^{+0.3}_{-0.5}$ northeast from the primary central dominant galaxy, suggesting the merger is in the plane of the sky. We measure temperature and density ratios across these edges, confirming they are sloshing cold fronts. We observe the eastern edge of the subcluster infall shock, confirming the observed subcluster is traveling from the southwest to the northeast in a clockwise orbit. We measure a shock density contrast of $1.38^{+0.16}_{-0.15}$ and infer a Mach number $1.25\pm0.08$ and a shock velocity of $2810^{+210}_{-240}$ km s$^{-1}$. Temperature and entropy maps show cool, low entropy gas trailing the subcluster in a southwestern tail, consistent with core shredding. Simulations suggest a perturber in the plane of the sky on a clockwise orbit would produce a sloshing spiral winding counterclockwise, opposite to that observed. The most compelling solution to this discrepancy is that the observed southeastern subcluster is on its first passage, shock heating gas during its clockwise infall, while the main cluster's clockwise cold front spiral formed from earlier encounters with a second perturber orbiting counterclockwise.
description: 17 pages, 14 figures
НАТУРАЛИЗМ КАК ФАКТОР ФОРМИРОВАНИЯ ПРОФЕССИИ ШОУРАННЕР В РОССИЙСКОЙ КИНОИНДУСТРИИ
Creators: name: Сообщество рецензентов Международного научно-исследовательского журнала
Publisher: name: ООО Цифра
Year: 2023
Subjects: naturalism
TV series
showrunner
directing theatre
filmmaking
натурализм
сериал
шоураннер
режиссерский театр
кинопроизводство

description: Международный научно-исследовательский журнал, Выпуск 9 (135) 2023
Photobombing Earth 2.0: Diffraction Limit Related Contamination and Uncertainty in Habitable Planet Spectra
Creators: name: Saxena, Prabal
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Observing habitable exoplanets that may resemble Earth is a key priority in astronomy that is dependent on not only detecting such worlds, but also ascertaining that apparent signatures of habitability are not due to other sources. Space telescopes designed to observe such worlds, such as that recommended by NASA's 2020 Astrophysics Decadal Survey, have a diffraction-limited resolution that effectively spreads light from a source in a region around the source point. In this letter, we show that the diffraction limit of a 6 meter space telescope results in a point spread function of an Earth-like planet that may contain additional unanticipated bodies for systems at distances relevant to proposed searches. These unexpected additional objects, such as other planets and moons, can influence obtained spectra for a putative habitable planet by producing spurious features and adding additional uncertainty in the spectra. A model of the Earth observed by a 6 meter space telescope as though it was an exoplanet shows that the light from the Earth would be blended with the Moon, Mercury, Venus and Mars in various combinations and at different times for numerous combinations of distance to the system and wavelength. Given the importance of extricating the true spectra of a potentially habitable planet in order to search for biosignatures, we highlight the need to account for this effect during the development of relevant telescopes and suggest some potential means of accounting for this photobombing effect.
description: ApJL, https://iopscience.iop.org/article/10.3847/2041-8213/ac7b93
Spin pumping and torque statistics in the quantum noise limit
Creators: name: Virtanen, P.
name: Heikkilä, T. T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze the statistics of charge and energy currents and spin torque in a metallic nanomagnet coupled to a large magnetic metal via a tunnel contact. We derive a Keldysh action for the tunnel barrier, describing the stochastic currents in the presence of a magnetization precessing with the rate $Ω$. In contrast to some earlier approaches, we include the geometric phases that affect the counting statistics. We illustrate the use of the action by deriving spintronic fluctuation relations, the quantum limit of pumped current noise, and consider the fluctuations in two specific cases: the situation with a stable precession of magnetization driven by spin transfer torque, and the torque-induced switching between the minima of a magnetic anisotropy. The quantum corrections are relevant when the precession rate exceeds the temperature $T$, i.e., for $\hbar Ω\gtrsim k_B T$.
description: 10 pages, 4 figures
Graphene-based three-body amplification of photon heat tunneling
Creators: name: Simchi, Hamidreza
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We consider a three slabs configuration including two non-doped single layer graphene on insulating silicon dioxide (G/SiO2) substrates and one non-doped suspended single layer graphene (SG). The suspended layer is placed between two G/SiO2 layers. Without SG layer, the heat flux has maximum at Plasmon frequency supported by the G/SiO2 slabs. In three slabs configuration, the photon heat tunneling is amplified between two G/SiO2 layers significantly, only for specific range of vacuum gap between SG layer and G/SiO2 layers and Plasmon frequency, due to the coupling of modes between each G/SiO2 layer and SG layer. Since, the SG layer is a single atomic layer, the photon heat tunneling assisted by this configuration does not depend on the thickness of middle layer and in consequence, it can enable novel applications for nanoscale thermal management.
Steady streamwise transpiration control in turbulent pipe flow
Creators: name: Gómez, F
name: Blackburn, HM
name: Rudman, M
name: Sharma, AS
name: McKeon, BJ
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A study of the the main features of low- and high amplitude steady streamwise wall transpiration applied to pipe flow is presented. The effect of the two transpiration parameters, amplitude and wavenumber, on the flow have been investigated by means of direct numerical simulation at a moderate turbulent Reynolds number. The behaviour of the three identified mechanisms that act in the flow: modification of Reynolds shear stress, steady streaming and generation of non-zero mean streamwise gradients, have been linked to the transpiration parameters. The observed trends have permitted the identification of wall transpiration configurations able to reduce or increase the overall flow rate in -36.1% and 19.3% respectively. A resolvent analysis has been carried out to obtain a description of the reorganization of the flow structures induced by the transpiration.