cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
New distances for a selected set of visual binaries with inconsistent dynamical masses
Creators: name: Tamazian, V. S.
name: Malkov, O. Y.
name: Docobo, J. A.
name: Chulkov, D. A.
name: Campo, P. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have selected a set of 17 visual binaries that demonstrate great inconsistency between the systemic mass obtained through Kepler's Third Law as compared to that calculated through standard mass-luminosity and mass-spectrum relationships. A careful inspection of orbital data and parallaxes showed that the current orbits of nine binaries (WDS 00155-1608, WDS 00174+0853, WDS 05017+2050, WDS 06410+0954, WDS 16212-2536, WDS 17336-3706, WDS 19217-1557, WDS 20312+1116, and WDS 21118+5959) do not need to be improved, instead we recommend different parallax (distance) value for them. On the other hand, we considered that eight orbits (WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333) had to be improved. Due to various reasons mentioned in this paper, their distances should most likely be corrected unless better orbital solutions and/or more precise parallaxes are reported. To obtain consistent mass values, the use of the dynamical parallax is still recommended for 5 out of the 8 improved orbits. For WDS 02434-6643, WDS 09128-6055, and WDS 11532-1540, the improvement itself yields reasonable mass sums while maintaining π_{Hip} within a 1-2σ margin. New distance estimates for 16 stars (mainly based on the obtained dynamical parallaxes) and individual comments for all objects are presented and discussed.
description: 7 pages
Group actions, Teichmüller spaces and cobordisms
Creators: name: Apanasov, Boris N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We discuss how the global geometry and topology of manifolds depend on different group actions of their fundamental groups, and in particular, how properties of a non-trivial compact 4-dimensional cobordism $M$ whose interior has a complete hyperbolic structure depend on properties of the variety of discrete representations of the fundamental group of its 3-dimensional boundary $\partial M$. In addition to the standard conformal ergodic action of a uniform hyperbolic lattice on the round sphere $S^{n-1}$ and its quasiconformal deformations in $S^n$, we present several constructions of unusual actions of such lattices on everywhere wild spheres (boundaries of quasisymmetric embeddings of the closed $n$-ball into $S^n$), on non-trivial $(n-1)$-knots in $S^{n+1}$, as well as actions defining non-trivial compact cobordisms with complete hyperbolic structures in its interiors. We show that such unusual actions always correspond to discrete representations of a given hyperbolic lattice from "non-standard" components of its varieties of representations (faithful or with large kernels of defining homomorphisms).
description: 25 pages, 8 figures. arXiv admin note: text overlap with arXiv:1510.08951
Radio Constraints on Long-Lived Magnetar Remnants in Short Gamma-Ray Bursts
Creators: name: Fong, Wen-fai
name: Metzger, Brian D.
name: Berger, Edo
name: Ozel, Feryal
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The merger of a neutron star binary may result in the formation of a rapidly-spinning magnetar. The magnetar can potentially survive for seconds or longer as a supramassive neutron star before collapsing to a black hole if, indeed, it collapses at all. During this process, a fraction of the magnetar's rotational energy of ~10^53 erg is transferred via magnetic spin-down to the surrounding ejecta. The resulting interaction between the ejecta and the surrounding circumburst medium powers a >year-long synchrotron radio transient. We present a search for radio emission with the Very Large Array following nine short-duration gamma-ray bursts (GRBs) at rest-frame times of ~1.3-7.6 years after the bursts, focusing on those events which exhibit early-time excess X-ray emission that may signify the presence of magnetars. We place upper limits of <18-32 microJy on the 6.0 GHz radio emission, corresponding to spectral luminosities of
description: 9 pages, 4 figures, 2 tables. Submitted to ApJ
Rotational Dynamics and Star Formation in the Nearby Dwarf Galaxy NGC 5238
Creators: name: Cannon, John M.
name: McNichols, Andrew T.
name: Teich, Yaron G.
name: Ball, Catherine
name: Banovetz, John
name: Brock, Annika
name: Eisner, Brian A.
name: Fitzgibbon, Kathleen
name: Miazzo, Masao
name: Nizami, Asra
name: Reilly, Bridget
name: Ruvolo, Elizabeth
name: Singer, Quinton
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new HI spectral line images of the nearby low-mass galaxy NGC 5238, acquired with the Karl G. Jansky Very Large Array (VLA). Located at a distance of 4.51+/-0.04 Mpc, NGC 5238 is an actively star-forming galaxy with widespread H-alpha and UV continuum emission. The source is included in many ongoing and recent nearby galaxy surveys, but until this work the spatially resolved qualities of its neutral interstellar medium have remained unstudied. Our HI images resolve the disk on physical scales of ~400 pc, allowing us to undertake a detailed comparative study of the gaseous and stellar components. The HI disk is asymmetric in the outer regions, and the areas of high HI mass surface density display a crescent-shaped morphology that is slightly offset from the center of the stellar populations. The HI column density exceeds 10^21 cm^-2 in much of the disk. We quantify the degree of co-spatiality of dense HI gas and sites of ongoing star formation as traced by far-UV and H-alpha emission. The neutral gas kinematics are complex; using a spatially-resolved position-velocity analysis, we infer a rotational velocity of 31+/-5 km/s. We place NGC 5238 on the baryonic Tully-Fisher relation and contextualize the system amongst other low-mass galaxies.
description: Accepted for publication in the Astronomical Journal
Mapping how local perturbations influence systems-level brain dynamics
Creators: name: Gollo, Leonardo L.
name: Roberts, James A.
name: Cocchi, Luca
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: The human brain exhibits a relatively stable spatiotemporal organization that supports brain function and can be manipulated via local brain stimulation. Such perturbations to local cortical dynamics are globally integrated by distinct neural systems. However, it remains unclear how and why local changes in neural activity affect large-scale system dynamics. Here, we briefly review empirical and computational studies addressing how localized perturbations affect brain activity. We then systematically analyze a model of large-scale brain dynamics, assessing how localized changes in brain activity at the different sites affect whole-brain dynamics. We find that local stimulation induces changes in brain activity that can be summarized by relatively smooth tuning curves, which relate a region's effectiveness as a stimulation site to its position within the cortical hierarchy. Our results also support the notion that brain hubs, operating in a slower regime, are more resilient to focal perturbations and critically contribute to maintain stability in global brain dynamics. In contrast, perturbations of peripheral regions, characterized by faster activity, have greater impact on functional connectivity. As a parallel with this region-level result, we also find that peripheral systems such as the visual and sensorimotor networks were more affected by local perturbations than high-level systems such as the cingulo-opercular network. Our results highlight the importance of a periphery-to-core hierarchy to determine the effect of local stimulation on the brain network. We also provide novel resources to orient empirical work aiming at manipulating functional connectivity using non-invasive brain stimulation.
description: 41 pages, 9 figures
The Neumann Problem on Ellipsoids
Creators: name: Axler, Sheldon
name: Shin, Peter J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 31B05

description: The Neumann problem on an ellipsoid in R^n asks for a function harmonic inside the ellipsoid whose normal derivative is some specified function on the ellipsoid. We solve this problem when the specified function on the ellipsoid is a normalized polynomial (a polynomial divided by the norm of the normal vector arising from the definition of the ellipsoid). Specifically, we give a necessary and sufficient condition for a solution to exist, and we show that if a solution exists then it is a polynomial whose degree is at most the degree of the polynomial giving the specified function. Furthermore, we give an algorithm for computing this solution. We also solve the corresponding generalized Neumann problem and give an algorithm for computing its solution.
European Union Litigation
Creators: name: Hacker, Philipp
name: Schäfer, Marie-Sophie
Publisher: name: Humboldt-Universität zu Berlin
Year: 2018
Subjects: subject: 340 Recht

description: This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
description: AbstractThis article provides an overview of cases decided by the Court of Justice of the European Union concerning contract law. The present issue covers the period between July 2017 and the beginning of January 2018.
Finite-temperature second-order many-body perturbation theory revisited
Creators: name: Santra, Robin
name: Schirmer, Jochen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an algebraic, nondiagrammatic derivation of finite-temperature second-order many-body perturbation theory [FT-MBPT(2)], using techniques and concepts accessible to theoretical chemical physicists. We give explicit expressions not just for the grand potential but particularly for the mean energy of an interacting many-electron system. The framework presented is suitable for computing the energy of a finite or infinite system in contact with a heat and particle bath at finite temperature and chemical potential. FT-MBPT(2) may be applied if the system, at zero temperature, may be described using standard (i.e., zero-temperature) second-order many-body perturbation theory [ZT-MBPT(2)] for the energy. We point out that in such a situation, FT-MBPT(2) reproduces, in the zero-temperature limit, the energy computed within ZT-MBPT(2). In other words, the difficulty that has been referred to as the Kohn--Luttinger conundrum, does not occur. We comment, in this context, on a "renormalization" scheme recently proposed by Hirata and He.
description: To appear in Chem. Phys. (2016)
On the work of internal forces
Creators: name: Guemez, Julio
name: Fiolhais, Manuel
name: Brito, Lucilia
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We discuss the role of the internal forces and how their work changes the energy of a system. We illustrate the contribution of the internal work to the variation of the system's energy, using a pure mechanical example, a thermodynamical system and an example from electromagnetism. We emphasize that internal energy variations related to the work of the internal forces should be pinpointed in the classroom and placed on the same footing as other internal energy variations such as those caused by temperature changes or by chemical reactions.
description: 11 pages, 4 figures
Vertical magnetic field gradient in the photospheric layers of sunspots
Creators: name: Joshi, Jayant
name: Lagg, Andreas
name: Hirzberger, Johann
name: Solanki, Sami K.
name: Tiwari, Sanjiv K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the vertical gradient of the magnetic field of sunspots in the photospheric layer. Independent observations were obtained with the SOT/SP onboard the Hinode spacecraft and with the TIP-2 mounted at the VTT. We apply state-of-the-art inversion techniques to both data sets to retrieve the magnetic field and the corresponding vertical gradient. In the sunspot penumbrae we detected patches of negative vertical gradients of the magnetic field strength, i.e.,the magnetic field strength decreases with optical depth in the photosphere. The negative gradient patches are located in the inner and partly in the middle penumbrae in both data sets. From the SOT/SP observations, we found that the negative gradient patches are restricted mainly to the deep photospheric layers and are concentrated near the edges of the penumbral filaments. MHD simulations also show negative gradients in the inner penumbrae, also at the locations of filaments. Both in the observations and simulation negative gradients of the magnetic field vs. optical depth dominate at some radial distances in the penumbra. The negative gradient with respect to optical depth in the inner penumbrae persists even after averaging in the azimuthal direction, both in the observations and, to a lesser extent, also in MHD simulations. We interpret the observed localized presence of the negative vertical gradient of the magnetic field strength in the observations as a consequence of stronger field from spines expanding with height and closing above the weaker field inter-spines. The presence of the negative gradients with respect to optical depth after azimuthal averaging can be explained by two different mechanisms: the high corrugation of equal optical depth surfaces and the cancellation of polarized signal due to the presence of unresolved opposite polarity patches in the deeper layers of the penumbra.
description: 17 pages, 25 figures, accepted for publication in A&A
MPEC 2023-R189 : 2021 QE2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Galactic planetary nebulae with precise nebular abundances as a tool to understand the evolution of asymptotic giant branch stars
Creators: name: Garcia-Hernandez, D. A.
name: Ventura, P.
name: Delgado-Inglada, G.
name: Dell'Agli, F.
name: Di Criscienzo, M.
name: Yagüe, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present nucleosynthesis predictions (HeCNOCl) from asymptotic giant branch (AGB) models, with diffusive overshooting from all the convective borders, in the metallicity range Z/4 < Z < 2Zsun. They are compared to recent precise nebular abundances in a sample of Galactic planetary nebulae (PNe) that is divided among double-dust chemistry (DC) and oxygen-dust chemistry (OC) according to the infrared dust features. Unlike the similar subsample of Galactic carbon-dust chemistry PNe recently analysed by us, here the individual abundance errors, the higher metallicity spread, and the uncertain dust types/subtypes in some PNe do not allow a clear determination of the AGB progenitor masses (and formation epochs) for both PNe samples; the comparison is thus more focussed on a object-by-object basis. The lowest metallicity OC PNe evolve from low-mass (~1 Msun) O-rich AGBs, while the higher metallicity ones (all with uncertain dust classifications) display a chemical pattern similar to the DC PNe. In agreement with recent literature, the DC PNe mostly descend from high-mass (M > 3.5 Msun) solar/supersolar metallicity AGBs that experience hot bottom burning (HBB), but other formation channels in low-mass AGBs like extra mixing, stellar rotation, binary interaction, or He pre-enrichment cannot be disregarded until more accurate C/O ratios would be obtained. Two objects among the DC PNe show the imprint of advanced CNO processing and deep second dredge-up, suggesting progenitors masses close to the limit to evolve as core collapse supernovae (above 6 Msun). Their actual C/O ratio, if confirmed, indicate contamination from the third dredge-up, rejecting the hypothesis that the chemical composition of such high-metallicity massive AGBs is modified exclusively by HBB.
description: Accepted for publication in MNRAS (11 pages, 3 figures, and 2 tables)
Practical access to (S)-heterocyclic aromatic acetates via CAL-B/Na2CO3-deacylation and Mitsunobu reaction protocol
Creators: name: Braïa, Nabila
name: Merabet-Khelassi, Mounia
name: Toffano, Martial
name: Aribi-Zouioueche, Louisa
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
classificationCode: 110309
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Herein, we report the preparation of enantiomerically pure forms of 2,3-dihydrobenzofuran-3-ol (1), chroman-4-ol (2), thiochroman-4-ol (3), 1-(furan-2-yl) ethanol (5) and 1-(thiophen-2-yl) ethanol (6), through a kinetic resolution catalysed by Candida antarctica lipase B/Na2CO3 hydrolysis sequence in organic media. The (R)-furnished alcohols and the (S)-remained acetates are recovered enantiopures (ee >99%, E ≫ 200, Conv = 50%). Those ideal enzymatic kinetic resolution (EKRs) are well incorporated to the Mitsunobu inversion protocol in a one pot procedure to give (S)-heterocyclic acetates (1a–3a) in good to high enantiomeric excess (88%–92% ee). Whilst, the (S)-heteroaromatic acetates (5a and 6a) are given with moderate enantiomeric excess (51%–62% ee). All the (S)-acetates are given in good isolated chemical yields (>80%) allowing to overcome the maximum of 50% yield which could be usually reached in a regular kinetic resolution processes.
Cosmic Sculpture: A new way to visualise the Cosmic Microwave Background
Creators: name: Clements, D. L.
name: Sato, S.
name: Fonseca, A. Portela
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: 3D printing presents an attractive alternative to visual representation of physical datasets such as astronomical images that can be used for research, outreach or teaching purposes, and is especially relevant to people with a visual disability. We here report the use of 3D printing technology to produce a representation of the all-sky Cosmic Microwave Background (CMB) intensity anisotropy maps produced by the Planck mission. The success of this work in representing key features of the CMB is discussed as is the potential of this approach for representing other astrophysical data sets. 3D printing such datasets represents a highly complementary approach to the usual 2D projections used in teaching and outreach work, and can also form the basis of undergraduate projects. The CAD files used to produce the models discussed in this paper are made available.
description: Accepted for publication in the European Journal of Physics
Vortex Mechanics in Thin Ferromagnetic Nanodisks
Creators: name: Zaspel, C. E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The magnetostatic energy is calculated for a magnetic vortex in a noncircular elliptical nanodisk. It is well-known that the energy of a vortex in the circular disk is minimized though an ansatz that eliminates the magnetostatic charge at the disk edge. Beginning with this ansatz for the circular disk, a conformal mapping of a circle interior onto the interior of an ellipse results in the magnetization of the elliptical disk. This magnetization in the interior of an ellipse also has no magnetostatic charge at the disk edge also minimizing the magnetostatic energy. As expected the energy has a quadratic dependence on the displacement of the vortex core from the ellipse center, but reflecting the lower symmetry of the ellipse. Through numerical integration of the magnetostatic integral a general expression for the energy is obtained for ellipticity values from 1.0 to about 0.3. Finally a general expression for the gyrotropic frequency as described by the Thiele equation is obtained.
Practical access to (S)-heterocyclic aromatic acetates via CAL-B/Na2CO3-deacylation and Mitsunobu reaction protocol
Creators: name: Aribi-Zouioueche, Louisa
name: Merabet-Khelassi, Mounia
name: Braïa, Nabila
name: Toffano, Martial
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
classificationCode: 110309
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Herein, we report the preparation of enantiomerically pure forms of 2,3-dihydrobenzofuran-3-ol (1), chroman-4-ol (2), thiochroman-4-ol (3), 1-(furan-2-yl) ethanol (5) and 1-(thiophen-2-yl) ethanol (6), through a kinetic resolution catalysed by Candida antarctica lipase B/Na2CO3 hydrolysis sequence in organic media. The (R)-furnished alcohols and the (S)-remained acetates are recovered enantiopures (ee >99%, E ≫ 200, Conv = 50%). Those ideal enzymatic kinetic resolution (EKRs) are well incorporated to the Mitsunobu inversion protocol in a one pot procedure to give (S)-heterocyclic acetates (1a–3a) in good to high enantiomeric excess (88%–92% ee). Whilst, the (S)-heteroaromatic acetates (5a and 6a) are given with moderate enantiomeric excess (51%–62% ee). All the (S)-acetates are given in good isolated chemical yields (>80%) allowing to overcome the maximum of 50% yield which could be usually reached in a regular kinetic resolution processes.
EELT-HIRES the high-resolution spectrograph for the E-ELT
Creators: name: Marconi, A.
name: Di Marcantonio, P.
name: D'Odorico, V.
name: Cristiani, S.
name: Maiolino, R.
name: Oliva, E.
name: Origlia, L.
name: Riva, M.
name: Valenziano, L.
name: Zerbi, F. M.
name: Abreu, M.
name: Adibekyan, V.
name: Prieto, C. Allende
name: Amado, P. J.
name: Benz, W.
name: Boisse, I.
name: Bonfils, X.
name: Bouchy, F.
name: Buchhave, L.
name: Buscher, D.
name: Cabral, A.
name: Martins, B. L. Canto
name: Chiavassa, A.
name: Coelho, J.
name: Christensen, L. B.
name: Delgado-Mena, E.
name: De Medeiros, J. R.
name: Di Varano, I.
name: Figueira, P.
name: Fisher, M.
name: Fynbo, J. P. U.
name: Glasse, A. C. H.
name: Haehnelt, M.
name: Haniff, C.
name: Hansen, C. J.
name: Hatzes, A.
name: Huke, P.
name: Korn, A. J.
name: Leao, I. C.
name: Liske, J.
name: Lovis, C.
name: Maslowski, P.
name: Matute, I.
name: McCracken, R. A.
name: Martins, C. J. A. P.
name: Monteiro, M. J. P. F. G.
name: Morris, S.
name: Morris, T.
name: Nicklas, H.
name: Niedzielski, A.
name: Nunes, N. J.
name: Palle, E.
name: Parr-Burman, P.
name: Parro, V.
name: Parry, I.
name: Pepe, F.
name: Piskunov, N.
name: Queloz, D.
name: Quirrenbach, A.
name: Lopez, R. Rebolo
name: Reiners, A.
name: Reid, D. T.
name: Santos, N.
name: Seifert, W.
name: Sousa, S.
name: Stempels, H. C.
name: Strassmeier, K.
name: Sun, X.
name: Udry, S.
name: Vanzi, L.
name: Vestergaard, M.
name: Weber, M.
name: Zackrisson, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The first generation of E-ELT instruments will include an optical-infrared High Resolution Spectrograph, conventionally indicated as EELT-HIRES, which will be capable of providing unique breakthroughs in the fields of exoplanets, star and planet formation, physics and evolution of stars and galaxies, cosmology and fundamental physics. A 2-year long phase A study for EELT-HIRES has just started and will be performed by a consortium composed of institutes and organisations from Brazil, Chile, Denmark, France, Germany, Italy, Poland, Portugal, Spain, Sweden, Switzerland and United Kingdom. In this paper we describe the science goals and the preliminary technical concept for EELT-HIRES which will be developed during the phase A, as well as its planned development and consortium organisation during the study.
description: 12 pages, in Ground-based and Airborne Instrumentation for Astronomy VI, 2016, Proc. SPIE 9908, 23
"Walking" Along a Free Rotating Bicycle Wheel (Round and Round)
Creators: name: Guemez, Julio
name: Fiolhais, Manuel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics Education (physics.ed-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: We describe the kinematics, dynamics and also some energetic issues related to the Marta mouse motion when she walks on top of a horizontal bicycle wheel, which is free to rotate like a merry-to-go round, as presented recently by Paul Hewitt in the Figuring Physics section of this magazine.
description: 6 pages, 4 figures
Establishing binarity amongst Galactic RV Tauri stars with a disc
Creators: name: Manick, Rajeev
name: Van Winckel, Hans
name: Kamath, Devika
name: Hillen, Michel
name: Escorza, Ana
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This study is a contribution in comprehending the role of binarity upon late stages of stellar evolution. We determine the binary status of six Galactic RV Tauri stars, namely DY Ori, EP Lyr, HP Lyr, IRAS 17038-4815, IRAS 09144-4933 and TW Cam, which are surrounded by a dusty disc. We also place them on the HR diagram, thereby establishing their evolutionary nature. All the six Galactic RV Tauri stars included in this study are binaries with orbital periods ranging between $\sim$ 650 and 1700 days and with eccentricities between 0.2 and 0.6. The mass functions range between 0.08 to 0.55 M$_\odot$ which points to an unevolved low mass companion. In the photometric time series we detect a long-term variation on the time-scale of the orbital period for IRAS 17038-4815, IRAS 09144-4933 and TW Cam. Our derived stellar luminosities obtained from a calibrated PLC relation indicates that all except DY Ori and EP Lyr, are post-AGB stars. DY Ori and EP Lyr are likely examples of the recently discovered dusty post-RGB stars. The orbital parameters strongly suggest that the evolution of these stars was interrupted by a strong phase of binary interaction during or even prior to the AGB. The observed eccentricities and long orbital periods among these stars provides a challenge to the standard theory of binary evolution.
description: 18 pages, 19 figures, Accepted to be published in A&A
Large-scale filamentary structures around the Virgo cluster revisited
Creators: name: Kim, Suk
name: Rey, Soo-Chang
name: Bureau, Martin
name: Yoon, Hyein
name: Chung, Aeree
name: Jerjen, Helmut
name: Lisker, Thorsten
name: Jeong, Hyunjin
name: Sung, Eon-Chang
name: Lee, Youngdae
name: Lee, Woong
name: Chung, Jiwon
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We revisit the filamentary structures of galaxies around the Virgo cluster, exploiting a larger dataset based on the HyperLeda database than previous studies. In particular, this includes a large number of low-luminosity galaxies, resulting in better sampled individual structures. We confirm seven known structures in the distance range 4~$h^{-1}$~Mpc~$
description: 8 pages, 4 figures, accepted for publication in ApJ
Entanglement Entropy in (3+1)-d Free $U(1)$ Gauge Theory
Creators: name: Soni, Ronak M
name: Trivedi, Sandip P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the entanglement entropy for a free $U(1)$ theory in $3 + 1$ dimensions in the extended Hilbert space definition. By taking the continuum limit carefully we obtain a replica trick path integral which calculates this entanglement entropy. The path integral is gauge invariant, with a gauge fixing delta function accompanied by a Faddeev-Popov determinant. For a spherical region it follows that the result for the logarithmic term in the entanglement, which is universal, is given by the $a$ anomaly coefficient. We also consider the extractable part of the entanglement, which corresponds to the number of Bell pairs which can be obtained from entanglement distillation or dilution. For a spherical region we show that the coefficient of the logarithmic term for the extractable part is different from the extended Hilbert space result. We argue that the two results will differ in general, and this difference is accounted for by a massless scalar living on the boundary of the region of interest.
description: 29 pages, 1 appendix
Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems (Replication Package)
Creators: name: Anonymous Author
name: Anonymous Author
name: Anonymous Author
name: Anonymous Author
Publisher: name: Zenodo
Year: 2023

description: This repository contains the replication package as well as obtained results for the study titled "Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems". These include simulation control script, simulation file, test output and evaluation scripts. cais_scenario.ttt is the actual simulation file and is loaded into CoppeliaSim cais_zmq_[search algorithm].py is the control script for each search algorithm and connected via the ZMQ zmqRemoteApi package file clusterdata[search algorithm].csv contains the output from clustering all test evaluations for the respective algorithm result_evaluation.py is the evaluation script Distribution.pdf is related only to distribution of failed evaluations evaluation results.zip contains outcomes from test data analysis (grouped[0,1,2].pdf are boxplots for failed, false "positives" and passed evaluations respectively) README.md instructions to run replication package result_[search algorithm].csv all test evaluations per algorithm run_details_[search algorithm].csv objective function output and time taken for each test evaluation per algorithm vargha_delaney.py python module for Vargha Delaney effect size determination Note: Instructions to run the package can be found in README.md
The faint radio sky: radio astronomy becomes mainstream
Creators: name: Padovani, Paolo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Radio astronomy has changed. For years it studied relatively rare sources, which emit mostly non-thermal radiation across the entire electromagnetic spectrum, i.e. radio quasars and radio galaxies. Now it is reaching such faint flux densities that it detects mainly star-forming galaxies and the more common radio-quiet active galactic nuclei. These sources make up the bulk of the extragalactic sky, which has been studied for decades in the infrared, optical, and X-ray bands. I follow the transformation of radio astronomy by reviewing the main components of the radio sky at the bright and faint ends, the issue of their proper classification, their number counts, luminosity functions, and evolution. The overall "big picture" astrophysical implications of these results, and their relevance for a number of hot topics in extragalactic astronomy, are also discussed. The future prospects of the faint radio sky are very bright, as we will soon be flooded with survey data. This review should be useful to all extragalactic astronomers, irrespective of their favourite electromagnetic band(s), and even stellar astronomers might find it somewhat gratifying.
description: Accepted for publication in Astronomy & Astrophysics Review, 36 pages, 12 figures
Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems (Replication Package)
Creators: name: Jubril Gbolahan Adigun
name: Huck, Tom Philip
name: Camilli, Matteo
name: Felderer, Michael
Publisher: name: Zenodo
Year: 2023
Subjects: Search-based testing
ML-enabled systems
Risk
Diversity analysis
Simulation

description: This repository contains the replication package as well as obtained results for the study titled "Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems". These include simulation control script, simulation file, test output and evaluation scripts. cais_scenario.ttt is the actual simulation file and is loaded into CoppeliaSim cais_zmq_[search algorithm].py is the control script for each search algorithm and connected via the ZMQ zmqRemoteApi package file clusterdata[search algorithm].csv contains the output from clustering all test evaluations for the respective algorithm result_evaluation.py is the evaluation script Distribution.pdf is related only to distribution of failed evaluations evaluation results.zip contains outcomes from test data analysis (grouped[0,1,2].pdf are boxplots for failed, false "positives" and passed evaluations respectively) README.md instructions to run replication package result_[search algorithm].txt all test evaluations per algorithm run_details_[search algorithm].csv objective function output and time taken for each test evaluation per algorithm vargha_delaney.py python module for Vargha Delaney effect size determination Note: Instructions to run the package can be found in README.md
description: This work has been partially supported by the Austrian Science Fund (FWF) for the project SafeSec, grant agreement No: I 4701 Internationale Projekt.
Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems (Replication Package)
Creators: name: Jubril Gbolahan Adigun
name: Huck, Tom Philip
name: Camilli, Matteo
name: Felderer, Michael
Publisher: name: Zenodo
Year: 2023
Subjects: Search-based testing
ML-enabled systems
Risk
Diversity analysis
Simulation

description: This repository contains the replication package as well as obtained results for the study titled "Risk-driven Online Testing and Test Case Diversity Analysis for ML-enabled Critical Systems". These include simulation control script, simulation file, test output and evaluation scripts. Hint: [search algorithm] refers to ES, GA, SA or RS. For instance, cais_zmq_[search algorithm].py could be cais_zmq_ES.py or cais_zmq_GA.py etc. cais_scenario.ttt is the actual simulation file and is loaded into CoppeliaSim cais_zmq_[search algorithm].py is the control script for each search algorithm and connected via the ZMQ zmqRemoteApi package file clusterdata[search algorithm].csv contains the output from clustering all test evaluations for the respective algorithm result_evaluation.py is the evaluation script Distribution.pdf is related only to distribution of failed evaluations evaluation results.zip contains outcomes from test data analysis (grouped[0,1,2].pdf are boxplots for failed, false "positives" and passed evaluations respectively) README.md instructions to run replication package result_[search algorithm].txt all test evaluations per algorithm run_details_[search algorithm].csv objective function output and time taken for each test evaluation per algorithm vargha_delaney.py python module for Vargha Delaney effect size determination Note: Instructions to run the package can be found in README.md
description: This work has been partially supported by the Austrian Science Fund (FWF) for the project SafeSec, grant agreement No: I 4701 Internationale Projekt.
Properties of the Turánian of modified Bessel functions
Creators: name: Mező, István
name: Baricz, Árpád
Publisher: name: arXiv
Year: 2016
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 33C10

description: In this paper some new series and integral representations for the Turánian of modified Bessel functions of the first kind are given, which give new asymptotic expansions and tight bounds for the Turán determinant in the question. It is shown that in the case of natural and real order the Turánian can be represented in a relatively compact form, which yields a uniform upper bound for the Turán determinant for modified Bessel functions of the first kind. Our results complement and improve some of the results from the literature.
Predictability of the Appearance of Anomalous Waves at Sufficiently Small Benjamin-Feir Indices
Creators: name: Ruban, V. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The numerical simulation of the nonlinear dynamics of random sea waves at moderately small Benjamin-Feir indices and its comparison with the linear dynamics (at the coincidence of spatial Fourier harmonics near a spectral peak at a certain time $t_p$) indicate that the appearance of a rogue wave can be predicted in advance. If the linear approximation shows the presence of a sufficiently extensive and/or high group of waves in the near future after $t_p$, an anomalous wave is almost necessarily formed in the nonlinear model. The interval of reliable forecasting covers several hundred wave periods, which can be quite sufficient in practice for, e.g., avoiding the meeting of a ship with a giant wave.
description: 4.5 pages, 10 figures
Failed Growth at the Bouncing Barrier in Planetesimal Formation
Creators: name: Kruss, Maximilian
name: Demirci, Tunahan
name: Koester, Marc
name: Kelling, Thorben
name: Wurm, Gerhard
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In laboratory experiments, we studied collisions of ensembles of compact (filling factor 0.33) millimeter dust aggregates composed of micrometer quartz grains. We used cylindrical aggregates, triangular aggregates, square aggregates, and rectangular aggregates. Ensembles of equal size aggregates as well as ensembles with embedded larger aggregates were studied. The typical collision velocities are 10-20 mm $\rm s^{-1}$. High spatial and temporal resolution imaging unambiguously shows that individual collisions lead to sticking with a high probability of 20 percent. This leads to connected clusters of aggregates. The contact areas between two aggregates increase with collision velocity. However, this cluster growth is only temporary, as subsequent collisions of aggregates and clusters eventually lead to the detachment of all aggregates from a cluster. The contacts are very fragile as aggregates cannot be compressed further or fragment under our experimental conditions to enhance the contact stability. Therefore, the evolution of the ensemble always leads back to a distribution of individual aggregates of initial size. This supports and extends earlier experiments showing that a bouncing barrier in planetesimal formation would be robust against shape and size variations.
Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
Creators: name: Lloyd, David T.
name: O'Keeffe, Kevin
name: Anderson, Patrick N.
name: Hooker, Simon M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: High harmonic generation (HHG) is an established means of producing coherent, short wavelength, ultrafast pulses from a compact set-up. Table-top high-harmonic sources are increasingly being used to image physical and biological systems using emerging techniques such as coherent diffraction imaging and ptychography. These novel imaging methods require coherent illumination, and it is therefore important to both characterize the spatial coherence of high-harmonic beams and understand the processes which limit this property. Here we investigate the near- and far-field spatial properties of high-harmonic radiation generated in a gas cell. The variation with harmonic order of the intensity profile, wavefront curvature, and complex coherence factor is measured in the far-field by the SCIMITAR technique. Using the Gaussian-Schell model, the properties of the harmonic beam in the plane of generation are deduced. Our results show that the order-dependence of the harmonic spatial coherence is consistent with partial coherence induced by both variation of the intensity-dependent dipole phase as well as finite spatial coherence of the driving radiation. These findings are used to suggest ways in which the coherence of harmonic beams could be increased further, which would have direct benefits to imaging with high-harmonic radiation.
description: 12 pages, 3 figures, journal article
Cross Currency Option Valuation
Creators: name: Lee, David
Publisher: name: Zenodo
Year: 2022
Subjects: Cross Currency Option Valuation

description: A cross currency option is a currency translated option of the type foreign equity option struck in domestic currency, which is a call or put on a foreign asset with a strike price set in domestic currency and payoff measured in domestic currency.
description: https://ia904707.us.archive.org/3/items/arrearQuantoCMS/arrearQuantoCMS.pdf
Improved multivariate portmanteau test
Creators: name: Mahdi, Esam
name: McLeod, A. Ian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62M10, 91B84

description: A new portmanteau diagnostic test for vector autoregressive moving average (VARMA) models that is based on the determinant of the standardized multivariate residual autocorrelations is derived. The new test statistic may be considered an extension of the univariate portmanteau test statistic suggested by Pena and Rodriguez (2002, A Powerful Portmanteau Test of Lack of Test for Time Series, Journal of American Statistical Association) The asymptotic distribution of the test statistic is derived as well as a chi-square approximation. However, the Monte-Carlo test is recommended unless the series is very long. Extensive simulation experiments demonstrate the usefulness of this test as well as its improved power performance compared to widely used previous multivariate portmanteau diagnostic check. Two illustrative applications are given.
description: 25 pages, 1 figure, 5 tables
Helicity conservation under quantum reconnection of vortex rings
Creators: name: Zuccher, Simone
name: Ricca, Renzo L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Here we show that under quantum reconnection, simulated by using the three-dimensional Gross- Pitaevskii equation, self-helicity of a system of two interacting vortex rings remains conserved. By resolving the fine structure of the vortex cores, we demonstrate that total length of the vortex system reaches a maximum at the reconnection time, while both writhe helicity and twist helicity remain separately unchanged throughout the process. Self-helicity is computed by two independent methods, and topological information is based on the extraction and analysis of geometric quantities such as writhe, total torsion and intrinsic twist of the reconnecting vortex rings.
Overview of the Baltic Sea and North Sea SST activities for the Copernicus Marine Service at DMI
Creators: name: Karagali, Ioanna
Publisher: name: Zenodo
Year: 2022

description: Short abstract  The Danish Meteorological Institute serves as a Production Unit (PU) for the Sea Surface Temperature (SST) Thematic Assembly Center (TAC) of the Copernicus Marine Monitoring Service. Within this framework, a suite of L3 and L4 SST products for the Baltic and North Sea are produced daily and as multi-year products. Having entered a new phase of the project in 2022, a range of activities are planned for the next three years, from releases of new products to improvements on existing ones. An example of a new product is the hourly L4 SST resolving the diurnal cycle in the North and Baltic Seas, currently under development. It is based on single-sensor satellite SST, aggregated hourly and optimally interpolated to generate gap-free hourly fields. Upon release, the product will allow monitoring of the daily SST variability, especially relevant for algal blooms and marine heatwaves. An improvement of the existing daily L4 SST product is related with its associated uncertainties as analysis showed them to be higher than those observed from comparisons with drifting and moored buoy in situ sensors. The aim of this presentation is to provide an overview of the existing SST products and their quality, along with a summary of the improvements planned for the ongoing Copernicus Marine Service phase, especially those to be implemented by the end of 2022; preliminary results for the generation and validation of the new L4 diurnal SST product and the validation of modelled uncertainties of the daily L4 SST for the North/Baltic Seas will be presented.
Discrete Fourier Transform Method for Discrimination of Digital Scintillation Pulses in Mixed Neutron-Gamma Fields
Creators: name: Safari, M. J.
name: Davani, F. Abbasi
name: Afarideh, H.
name: Jamili, S.
name: Bayat, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: A Discrete Fourier Transform Method (DFTM) for discrimination between the signal of neutrons and gamma rays in organic scintillation detectors is presented. The method is based on the transformation of signals into the frequency domain using the sine and cosine Fourier transforms in combination with the discrete Fourier transform. The method is largely benefited from considerable differences that usually is available between the zero-frequency components of sine and cosine and the norm of the amplitude of the DFT for neutrons and gamma-ray signals. Moreover, working in frequency domain naturally results in considerable suppression of the unwanted effects of various noise sources that is expected to be effective in time domain methods. The proposed method could also be assumed as a generalized nonlinear weighting method that could result in a new class of pulse shape discrimination methods, beyond definition of the DFT. A comparison to the traditional Charge Integration Method (CIM), as well as the Frequency Gradient Analysis Method (FGAM) and the Wavelet Packet Transform Method (WPTM) has been presented to demonstrate the applicability and efficiency of the method for real-world applications. The method, in general, shows better discrimination Figure of Merits (FoMs) at both the low-light outputs and in average over the studied energy domain. A noise analysis has been performed for all of the abovementioned methods. It reveals that the frequency domain methods (FGAM and DFTM) are less sensitive to the noise effects.
description: 9 pages, 9 figures, 2 tables