cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Liposomal FRET Assay Identifies Potent Drug‐Like Inhibitors of the Ceramide Transport Protein (CERT)
Creators: name: Samaha, Doaa
name: Hamdo, Housam H.
name: Cong, Xiaojing
name: Schumacher, Fabian
name: Banhart, Sebastian
name: Aglar, Öznur
name: Möller, Heiko M.
name: Heuer, Dagmar
name: Kleuser, Burkhard
name: Saied, Essa M.
name: Arenz, Christoph
Publisher: name: Robert Koch-Institut
Year: 2020
Subjects: subject: enzyme assays
subject: Förster resonance energy transfer (FRET)
subject: liposomes
subject: sphingolipids
subject: transport proteins
subject: 610 Medizin und Gesundheit

description: Ceramide transfer protein (CERT) mediates non‐vesicular transfer of ceramide from endoplasmic reticulum to Golgi apparatus and thus catalyzes the rate‐limiting step of sphingomyelin biosynthesis. Usually, CERT ligands are evaluated in tedious binding assays or non‐homogenous transfer assays using radiolabeled ceramides. Herein, a facile and sensitive assay for CERT, based on Förster resonance energy transfer (FRET), is presented. To this end, we mixed donor and acceptor vesicles, each containing a different fluorescent ceramide species. By CERT‐mediated transfer of fluorescent ceramide, a FRET system was established, which allows readout in 96‐well plate format, despite the high hydrophobicity of the components. Screening of a 2 000 compound library resulted in two new potent CERT inhibitors. One is approved for use in humans and one is approved for use in animals. Evaluation of cellular activity by quantitative mass spectrometry and confocal microscopy showed inhibition of ceramide trafficking and sphingomyelin biosynthesis.
Intrinsic peculiarities of real material realizations of a spin-1/2 kagome lattice
Creators: name: Janson, O.
name: Richter, J.
name: Rosner, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spin-1/2 magnets with kagome geometry, being for years a generic object of theoretical investigations, have few real material realizations. Recently, a DFT-based microscopic model for two such materials, kapellasite Cu3Zn(OH)6Cl2 and haydeeite Cu3Mg(OH)6Cl2, was presented [O. Janson, J. Richter and H. Rosner, arXiv:0806.1592]. Here, we focus on the intrinsic properties of real spin-1/2 kagome materials having influence on the magnetic ground state and the low-temperature excitations. We find that the values of exchange integrals are strongly dependent on O--H distance inside the hydroxyl groups, present in most spin-1/2 kagome compounds up to date. Besides the original kagome model, considering only the nearest neighbour exchange, we emphasize the crucial role of the exchange along the diagonals of the kagome lattice.
description: 4 pages, 4 figures. A paper for the proceedings of the HFM 2008 conference
A census of metals and baryons in stars in the local Universe
Creators: name: Gallazzi, Anna
name: Brinchmann, Jarle
name: Charlot, Stephane
name: White, Simon D. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We combine stellar metallicity and stellar mass estimates for a large sample of galaxies drawn from the SDSS DR2 spanning wide ranges in physical properties, in order to derive an inventory of the total mass of metals and baryons locked up in stars today. Physical parameter estimates are derived from galaxy spectra with high S/N (>20). Coadded spectra of galaxies with similar velocity dispersions, absolute r-band magnitudes and 4000Å-break values are used for those regions of parameter space where individual spectra have lower S/N. We estimate the total density of metals and of baryons in stars and, from these two quantities, we obtain a mass- and volume-averaged stellar metallicity of =1.04+-0.14 Z_sun, i.e. consistent with solar. We also study how metals are distributed in galaxies according to their mass, morphology and age, and we then compare these distributions with the corresponding distributions of stellar mass. We find that the bulk of metals locked up in stars in the local Universe reside in massive, bulge-dominated galaxies, with red colours and high 4000Å-break values corresponding to old stellar populations. Bulge-dominated and disc-dominated galaxies contribute similar amounts to the total stellar mass density, but have different fractional contributions to the mass density of metals in stars, in agreement with the mass-metallicity relation. Bulge-dominated galaxies contain roughly 40% of the total amount of metals in stars, while disc-dominated galaxies less than 25%. Finally, at a given galaxy stellar mass, we define two characteristic ages as the median of the distributions of mass and metals as a function of age. These characteristic ages decrease progressively from high-mass to low-mass galaxies, consistent with the high formation epochs of stars in massive galaxies.
description: replaced with accepted version, minor changes, references added
Josephson effects in twisted cuprate bilayers
Creators: name: Tummuru, Tarun
name: Plugge, Stephan
name: Franz, Marcel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Twisted bilayers of high-$T_c$ cuprate superconductors have been argued to form topological phases with spontaneously broken time reversal symmetry ${\cal T}$ for certain twist angles. With the goal of helping to identify unambiguous signatures of these topological phases in transport experiments, we theoretically investigate a suite of Josephson phenomena between twisted layers. We find an unusual non-monotonic temperature dependence of the critical current at intermediate twist angles which we attribute to the unconventional sign structure of the $d$-wave order parameter. The onset of the ${\cal T}$-broken phase near $45^\circ$ twist is marked by a crossover from the conventional $2π$-periodic Josephson relation $J(φ)\simeq J_c\sinφ$ to a $π$-periodic function as the single-pair tunneling becomes dominated by a second order process that involves two Cooper pairs. Despite this fundamental change, the critical current remains a smooth function of the twist angle $θ$ and temperature $T$ implying that a measurement of $J_c$ alone will not be a litmus test for the ${\cal T}$-broken phase. To obtain clear signatures of the ${\cal T}$-broken phase one must measure $J_c$ in the presence of an applied magnetic field or radio-frequency drive, where the resulting Fraunhofer patterns and Shapiro steps are altered in a characteristic manner. We discuss these results in light of recent experiments on twisted bilayers of the high-$T_c$ cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$.
description: 14 pages, 9 figures (including appendices)
Kahan discretizations of skew-symmetric Lotka-Volterra systems and Poisson maps
Creators: name: Evripidou, Charalampos
name: Kassotakis, Pavlos
name: Vanhaecke, Pol
Publisher: name: arXiv
Year: 2021
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 53D17, 37J35

description: The Kahan discretization of the Lotka-Volterra system, associated with any skew-symmetric graph $Γ$, leads to a family of rational maps, parametrized by the step size. When these maps are Poisson maps with respect to the quadratic Poisson structure of the Lotka-Volterra system, we say that the graph $Γ$ has the Kahan-Poisson property. We show that if $Γ$ is connected, it has the Kahan-Poisson property if and only if it is a cloning of a graph with vertices $1,2,\dots,n$, with an arc $i\to j$ precisely when $i
description: 24 pages, 8 figures, 12 references
Geochemical constraints on the genesis of AG-PB and ZN deposits, Sandon, British Columbia
Creators: name: Logan, James Metcalfe
Publisher: name: University of British Columbia
Year: 2010

description: Deposits of Slocan mining camp are Ag-rich, Pb- and Zn-bearing veins localized around Sandon, southeastern British Columbia. These small to medium tonnage (to 10⁶ tonnes) deposits occupy a major lode/fault system which crosscuts the regional fold structure of the enclosing Upper Triassic Slocan Group. The Late Jurassic Nelson batholith intrudes this clastic sequence and contains fewer and mineralogically different deposits than the sedimentary unit. Ore paragenesis and deposit-scale metal zonation patterns for the Hallmac deposit reveal two stages of silver mineralization. An early stage is characterized by exsolution inclusions of silver-sulphantimonides in galena. A later stage postdates the bulk of galena deposition, and is characterized by antimony-poor/silyer-rich sulphosalts and acanthite. These two stages of Ag mineralization represent respectively the 'wet' sediment-hosted and 'dry' batholith-hosted ore classifications of Cairnes (1934). 'Dry' ores are late stage, spatially restricted to the batholith or related stocks and peripherally distributed about the central area of 'wet' ore deposits at Sandon. The late stage mineral assemblages thereby establish a relatively later period of mineralization for batholith-hosted structures than those within the sedimentary sequence. Lithogeochemistry of the Slocan Group and lower-most Rossland Group indicates a single unit within the Slocan, the Slate belt, to be enriched in Ag, Ba and S. Nowhere in the stratigraphic sequence are Pb and Zn values recognizably higher than average black shale values. The Slate belt contains syn/diagenetic trace metal sulphides of pyrite, sphalerite, chalcopyrite, millerite and galena. Fe, S and possibly trace metals have been released during contact/regional metamorphism of pyritic sediments, in part accompanying the conversion of pyrite to pyrrhotite. The Slate belt coincides with the highest spatial density distribution of vein deposits at Sandon; source rock volume calculations suggest it could have acted as a source bed for base and precious metals in the veins. Pb-isotope studies of layered sulphides in the clastic sequence have established initial isotope ratios and μ-value approximations for the Upper Slocan Group. An evolutionary path starting at 1890 Ma (departure from the curve of Stacey and Kramers, 1975) with μ = 11.1 could have generated the required ²⁰⁶Pb/²⁰⁴Pb ratios for the vein deposits at t₃ = 160 ± 6 Ma. This suggests that lead and perhaps silver and zinc in epigenetic veins was extracted from the clastic sedimentary sequence during emplacement of the Late Jurassic Nelson batholith.
Production of a sterile species: quantum kinetics
Creators: name: Boyanovsky, D.
name: Ho, C. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Production of a sterile species is studied within an effective model of active-sterile neutrino mixing in a medium in thermal equilibrium. The quantum kinetic equations for the distribution functions and coherences are obtained from two independent methods: the effective action and the quantum master equation. The decoherence time scale for active-sterile oscillations is $τ_{dec} = 2/Γ_{aa}$, but the evolution of the distribution functions is determined by the two different time scales associated with the damping rates of the quasiparticle modes in the medium: $Γ_1=Γ_{aa}\cos^2\tm ; Γ_2=Γ_{aa}\sin^2\tm$ where $Γ_{aa}$ is the interaction rate of the active species in absence of mixing and $\tm$ the mixing angle in the medium. These two time scales are widely different away from MSW resonances and preclude the kinetic description of active-sterile production in terms of a simple rate equation. We give the complete set of quantum kinetic equations for the active and sterile populations and coherences and discuss in detail the various approximations. A generalization of the active-sterile transition probability \emph{in a medium} is provided via the quantum master equation. We derive explicitly the usual quantum kinetic equations in terms of the ``polarization vector'' and show their equivalence to those obtained from the quantum master equation and effective action.
description: To appear in Phys. Rev. D
Precise determination of orbital parameters in system with slowly drifting phases: application to the case of XTE J1807-294
Creators: name: Riggio, A.
name: Di Salvo, T.
name: Burderi, L.
name: Iaria, R.
name: Papitto, A.
name: Menna, T.
name: Lavagetto, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe a timing technique that allows to obtain precise orbital parameters of an accreting millisecond pulsar in those cases in which intrinsic variations of the phase delays (caused e.g. by proper variation of the spin frequency) with characteristic timescale longer than the orbital period do not allow to fit the orbital parameters over a long observation (tens of days). We show under which conditions this method can be applied and show the results obtained applying this method to the 2003 outburst observed by RXTE of the accreting millisecond pulsar XTE J1807-294 which shows in its phase delays a non-negligible erratic behavior. We refined the orbital parameters of XTE J1807-294 using all the 90 days in which the pulsation is strongly detected and the method applicable. In this way we obtain the orbital parameters of the source with a precision more than one order of magnitude better than the previous available orbital solution, a precision obtained to date, on accreting millisecond pulsars, only for XTE J1807-294 analyzing several outbursts spanning over seven years and with a much better statistics.
description: 14 pages, including 6 figures. Submitted to MNRAS. Accepted 2007 September 12. Received 2007 September 12; in original form 2007 February 22
The Lilac (Syringa L.) Register of Cultivar Names
Creators: name: Debard, Mark L.
name: M.D. Registrar
Publisher: name: Syringa L.: коллекции, выращивание, использование
Year: 2021
Subjects: Register
ICRA
ICNCP
ISHS

description: Every genus of cultivated plants has an organization (ICRA) to keep track of its cultivar names. For lilacs, the ICRA is the International Lilac Society (ILS), which appoints the Registrar. The Registrar maintains the “International Register of Cultivated Plants in the Genus Syringa” according to the rules of the International Code of Nomenclature for Cultivated Plants (ICNCP) under the authority of the International Society for Horticultural Science (ISHS). The major rules of nomenclature for cultivars are discussed.
Search for $D^0-{\bar D}^0$ Mixing Using Doubly Flavor Tagged Semileptonic Decay Modes
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have searched for $D^0 - \bar{D}^0$ mixing in $D^{*+} \to π^+ D^0$ decays with $D^0 \to K^{(*)} e ν$ in a sample of $e^+ e^- \to {c\bar c}$ events produced near 10.58 GeV. The charge of the slow pion from charged $D^*$ decay tags the charm flavor at production, and it is required to be consistent with the flavor of a fully reconstructed second charm decay in the same event. We observe 3 mixed candidates compared to 2.85 background events expected from simulation. We ascribe a 50% systematic uncertainty to this expected background rate. We find a central value for the mixing rate of $0.4 \times 10^{-4}$. Using a frequentist method, we set corresponding 68% and 90% confidence intervals at $(-5.6, 7.4) \times 10^{-4}$ and $(-13, 12) \times 10^{-4}$, respectively.
description: 13 pages, 7 figures, submitted to Phys.Rev.D
The Syringarium Exhibition of the “Alexandru Ciubotaru” National Botanical Garden (Institute)
Creators: name: Rosca I.
name: N.A, Onica
name: Elasco A.
name: Mirza, A.
Publisher: name: Syringa L.: коллекции, выращивание, использование
Year: 2021
Subjects: Syringarium
exhibition
“Alexandru Ciubotaru” National Botanical Garden (Institute)

description: The Syringarium is an exhibition in “Alexandru Ciubotaru” National Botanical Garden (Institute) designed in a particular architectural style, which illustrates various phytogeographical areas of the world and the role that these plants can play the in green spaces of urban and rural areas of the country.
D12.2 Draft Plan for Dissemination and Exploitation of Project Results (PDER)
Creators: name: Parry, Huw
name: Lindeque, Colin
Publisher: name: SteamBioAfrica
Year: 2023
Subjects: PDER

description: This project and the resultant Plan for Dissemination and Exploitation of Project Results (PDER), plan are progressions of the earlier SteamBio project (Grant Agreement 636865). It is therefore appropriate and consistent that the frameworks, methodology and strategies developed in this earlier project.This deliverable D12.2, draft PDER also builds on the plan that was included in the grant application submitted to the EU in January 2021. It is an intermediary step providing direction towards the final PDER that will be submitted at month 36 as Deliverable D12.7 Final PDER. The plan contains three core elements: knowledge management, dissemination of results and, exploitation of results.
D12.2 Draft Plan for Dissemination and Exploitation of Project Results (PDER)
Creators: name: Parry, Huw
name: Lindeque, Colin
Publisher: name: SteamBioAfrica
Year: 2021
Subjects: PDER

description: This deliverable D12.2, draft Plan for Dissemination and Exploitation of Project Results (PDER), builds on the plan that was included in the grant application submitted to the EU in January 2021. It is an intermediary step providing direction towards the final PDER that will be submitted at month 36 as Deliverable D12.7 Final PDER. The plan contains three core elements: knowledge management, dissemination of results and, exploitation of results.
Linking Physical Objects to Their Digital Twins via Fiducial Markers Designed for Invisibility to Humans
Creators: name: Schwartz, Mathew
name: Geng, Yong
name: Agha, Hakam
name: Kizhakidathazhath, Rijeesh
name: Liu, Danqing
name: Lenzini, Gabriele
name: Lagerwall, Jan PF
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The ability to label and track physical objects that are assets in digital representations of the world is foundational to many complex systems. Simple, yet powerful methods such as bar- and QR-codes have been highly successful, e.g. in the retail space, but the lack of security, limited information content and impossibility of seamless integration with the environment have prevented a large-scale linking of physical objects to their digital twins. This paper proposes to link digital assets created through BIM with their physical counterparts using fiducial markers with patterns defined by Cholesteric Spherical Reflectors (CSRs), selective retroreflectors produced using liquid crystal self-assembly. The markers leverage the ability of CSRs to encode information that is easily detected and read with computer vision while remaining practically invisible to the human eye. We analyze the potential of a CSR-based infrastructure from the perspective of BIM, critically reviewing the outstanding challenges in applying this new class of functional materials, and we discuss extended opportunities arising in assisting autonomous mobile robots to reliably navigate human-populated environments, as well as in augmented reality.
description: 30 pages, 8 figures. This paper is a very interdisciplinary topical review on the use of Cholesteric Spherical Reflectors to make fiducial markers-- visible to robots but not humans-- to link Digital and Physical twins. The authors are from fields including Design, Materials Science, Security and Computer Science, and Physics
D12.2 Draft Plan for Dissemination and Exploitation of Project Results (PDER)
Creators: name: Parry, Huw
name: Lindeque, Colin
Publisher: name: SteamBioAfrica
Year: 2022
Subjects: PDER

description: This deliverable D12.2, draft Plan for Dissemination and Exploitation of Project Results (PDER), builds on the plan that was included in the grant application submitted to the EU in January 2021. It is an intermediary step providing direction towards the final PDER that will be submitted at month 36 as Deliverable D12.7 Final PDER. The plan contains three core elements: knowledge management, dissemination of results and, exploitation of results.
Ricci-Determinant Gravity: Dynamical Aspects and Astrophysical Implications
Creators: name: Azri, Hemza
name: Ekşi, K. Yavuz
name: Karahan, Canan
name: Nasri, Salah
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Palatini gravitational action is enlarged by an arbitrary function $f(X)$ of the determinants of the Ricci tensor and the metric, $X=|\textbf{det}.R|/|\textbf{det}.g|$. The resulting Ricci-determinant theory exhibits novel deviations from general relativity. We study a particular realization where the extension is characterized by the square-root of the Ricci-determinant, $f(X)=λ_\text{Edd}\sqrt{X}$, which corresponds to the famous Eddington action. We analyze the obtained equations for a perfect fluid source and show that the affine connection can be solved in terms of the energy density and pressure of the fluid through an obtained disformal metric. As an application, we derive the hydrostatic equilibrium equations for relativistic stars and inspect the significant effects induced by the square-root of the Ricci tensor. We find that an upper bound on $λ_{\rm Edd}$, at which deviations from the predictions of general relativity on neutron stars become prominent, corresponds to the hierarchy between the Planck and the vacuum mass scales. The Ricci-determinant gravity that we propose here is expected to have interesting implications in other cosmological domains.
description: 10 pages, to appear in Physical Review D
Production of the Charmonium States chic_1 and chic_2 in Proton Nucleus Interactions at sqrt{s} = 41.6 GeV
Creators: name: B Collaboration
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A measurement of the ratio R_chic = (chic -> Jpsi + gam)/ Jpsi in pC, pTi and pW interactions at 920 GeV/c (sqrt{s}=41.6 GeV) in the Feynman-x range -0.35 < x_F(Jpsi) < 0.15 is presented. Both mu+mu- and e+e- Jpsi decay channels are observed with an overall statistics of about 15000 chic events, which is by far the largest available sample in pA collisions. The result is R_chic = 0.188+-0.013(st)(+0.024)(-0.022)(sys) averaged over the different materials, when no Jpsi and chic polarisations are considered. The chic_1 to chic_2 production ratio R_12 = R_chic1/R_chic2 is measured to be 1.02+-0.40, leading to a cross section ratio sigma(chic_1)/sigma(chic_2)=0.57+-0.23. The dependence of R_chic on the Feynman-x of the Jpsi, x_F(Jpsi), and its transverse momentum, p_T(Jpsi), is studied, as well as its dependence on the atomic number, A, of the target. For the first time, an extensive study of possible biases on R_chic and R_12 due to the dependence of acceptance on the polarization states of Jpsi and chic is performed. By varying the polarisation parameter, lambda(obs), of all produced Jpsi's by two sigma around the value measured by HERA-B, and considering the maximum variation due to the possible chic_1 and chic_2 polarisations, it is shown that R_chic could change by a factor between 1.02 and 1.21 and R_12 by a factor between 0.89 and 1.16.
description: 19 pages, 7 figures
Lithiotis bioherms in the Pliensbachian (Lower Jurassic) of North America
Creators: name: Nauss, Anne L.
Publisher: name: University of British Columbia
Year: 2010

description: In North America the aberrant pelecypod Lithiotis occurs in Upper Pliensbachian strata in Oregon, California and Nevada. The epifaunal, sessile bivalve formed massive, low diversity bioherms in shallow water marginal marine facies, which are most extensive in the Robertson Formation of east central Oregon. Lithiotis bioherms of the Robertson Formation comprise three biofacies; (1) a Reef Flank Assemblage; (2) a Death Assemblage and (3) a Life Assemblage. The Reef Flank Assemblage is characterized by Lithiotis shelly debris, the gastropod Nerinea and terebratulid brachiopods and marks the perimeter of the bioherms. The Death Assemblage is comprised of Lithiotis bivalves lying parallel to bedding and the Life Assemblage is made up of in situ vertical Lithiotis. Lithiotis is an elongate, stick-like bivalve that reaches over 30 cm in height and is made up of a thick, robust attached valve and a thin, fragile free valve. The free valve articulates with the attached valve by a ridge-and-groove structure on the cardinal face of the attached valve. Lithiotis is similar in morphology and occurs in a similar paleoenvironment as the Lower Jurassic bivalve, Cochlearites and the Upper Cretaceous oyster, Konbostrea. All three bivalves are found in low diversity bioherms that formed in a shallow water, marginal marine environment. The paleogeographic distribution of Lithiotis is widespread. Lithiotis occurs in the East Pacific, Circum-Mediterranean region and in the Eastern Tethys Ocean. An endemic center of the bivalves existed during the Pliensbachian in the East Pacific of North America and the Western Tethys Ocean, which indicates that Pliensbachian migration occurred through the Hispanic Corridor. During the Lower Toarcian Lithiotis migrated from the endemic center to the East Pacific of South America and to the Eastern Tethys Ocean. The absence of Lithiotis in the Canadian suspect terranes is likely due to collection failure or lack of appropriate shallow water marginal facies. Offshore exploration could well reveal Lithiotis in a shallow water marginal marine facies in Wrangellia in the Queen Charlotte Islands area.
Vela Pulsar: Single Pulses Analysis with Machine Learning Techniques
Creators: name: Lousto, Carlos O.
name: Missel, Ryan
name: Prajapati, Harsh
name: Fiscella, Valentina Sosa
name: Armengol, Federico G. López
name: Gyawali, Prashnna Kumar
name: Wang, Linwei
name: Cahill, Nathan
name: Combi, Luciano
name: del Palacio, Santiago
name: Combi, Jorge A.
name: Gancio, Guillermo
name: García, Federico
name: Gutiérrez, Eduardo M.
name: Hauscarriaga, Fernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study individual pulses of Vela (PSR\ B0833-45\,/\,J0835-4510) from daily observations of over three hours (around 120,000 pulses per observation), performed simultaneously with the two radio telescopes at the Argentine Institute of Radioastronomy. We select 4 days of observations in January-March 2021 and study their statistical properties with machine learning techniques. We first use density based DBSCAN clustering techniques, associating pulses mainly by amplitudes, and find a correlation between higher amplitudes and earlier arrival times. We also find a weaker (polarization dependent) correlation with the mean width of the pulses. We identify clusters of the so-called mini-giant pulses, with $\sim10\times$ the average pulse amplitude. We then perform an independent study, with Self-Organizing Maps (SOM) clustering techniques. We use Variational AutoEncoder (VAE) reconstruction of the pulses to separate them clearly from the noise and select one of the days of observation to train VAE and apply it to thre rest of the observations. We use SOM to determine 4 clusters of pulses per day per radio telescope and conclude that our main results are robust and self-consistent. These results support models for emitting regions at different heights (separated each by roughly a hundred km) in the pulsar magnetosphere. We also model the pulses amplitude distribution with interstellar scintillation patterns at the inter-pulses time-scale finding a characterizing exponent $n_{\mathrm{ISS}}\sim7-10$. In the appendices we discuss independent checks of hardware systematics with the simultaneous use of the two radio telescopes in different one-polarization / two-polarizations configurations. We also provide a detailed analysis of the processes of radio-interferences cleaning and individual pulse folding.
description: 19 pages
Non-commutative Renormalization
Creators: name: Rivasseau, Vincent
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A new version of scale analysis and renormalization theory has been found on the non-commutative Moyal space. It could be useful for physics beyond the standard model or for standard physics in strong external field. The good news is that quantum field theory is better behaved on non-commutative than on ordinary space: indeed it has no Landau ghost. Noncommutativity might therefore be an alternative to supersymmetry. We review this rapidly growing subject.
description: 82 pages, Poincare Seminar, updated and expanded version of arXiv:hep-th/0702068
SDSS-IV MaNGA: Integral-field kinematics and stellar population of a sample of galaxies with counter-rotating stellar disks selected from about 4000 galaxies
Creators: name: Bevacqua, Davide
name: Cappellari, Michele
name: Pellegrini, Silvia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the integral-field kinematics and stellar population properties of 64 galaxies (61 are Early-Type galaxies, ETGs) with Counter-Rotating stellar Disks (CRD) selected from about 4000 galaxies in the MaNGA survey, based on evidence of counter-rotation or two velocity dispersion peaks in the kinematic maps. For 17 CRDs, the counter-rotating components can also be separated spectroscopically. The frequency of CRDs in MaNGA is <5% for ellipticals, <3% for lenticulars and <1% for spirals (at 95% confidence level), consistent with previous estimates. We produced age and metallicity maps, and compared the stellar population properties to those of the general ETGs population. We found that CRDs have similar trends in age and metallicity to ETGs, but are less metallic at low masses, and show flatter age and steeper metallicity gradients, on average. A comparison of the velocity fields of the ionized gas and the stars reveals that in 33 cases the gas corotates with either the inner (15 cases) or outer (18 cases) stellar disk, in 9 cases it is misaligned. In most cases the gas corotates with the younger disk. Evidence of multimodality in the stellar population is found in 31 galaxies, while the 14 youngest and least massive galaxies show ongoing star formation; 14 galaxies, instead, exhibit unimodality, and are the oldest and most massive. As a general result, our work indicates that CRDs form primarily via gas accretion in retrograde rotation with respect to a pre-existing stellar disk.
description: 26 pages, 22 figures, 1 table. Accepted for publication on December 16, 2021; published as MNRAS 511, 139 (2022)
Statistics of Microstructure Formation in Martensitic Transitions Studied by a Random-Field Potts Model with Dipolar-like Interactions
Creators: name: Cerruti, B.
name: Vives, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have developed a simple model for the study of a cubic to tetragonal martensitic transition, under athermal conditions, in systems with a certain amount of disorder. We have performed numerical simulations that allow for a statistical study of the dynamics of the transition when the system is driven from the high-temperature cubic phase to the low-temperature degenerate tetragonal phase. Our goal is to reveal the existence of kinetic constraints that arise from competition between the equivalent variants of the martensitic phase, and which prevent the system from reaching optimal final microstructures.
description: 11 pages, 14 figures
Fibro-CoSANet: Pulmonary Fibrosis Prognosis Prediction using a Convolutional Self Attention Network
Creators: name: Nazi, Zabir Al
name: Mashrur, Fazla Rabbi
name: Islam, Md Amirul
name: Saha, Shumit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Idiopathic pulmonary fibrosis (IPF) is a restrictive interstitial lung disease that causes lung function decline by lung tissue scarring. Although lung function decline is assessed by the forced vital capacity (FVC), determining the accurate progression of IPF remains a challenge. To address this challenge, we proposed Fibro-CoSANet, a novel end-to-end multi-modal learning-based approach, to predict the FVC decline. Fibro-CoSANet utilized CT images and demographic information in convolutional neural network frameworks with a stacked attention layer. Extensive experiments on the OSIC Pulmonary Fibrosis Progression Dataset demonstrated the superiority of our proposed Fibro-CoSANet by achieving the new state-of-the-art modified Laplace Log-Likelihood score of -6.68. This network may benefit research areas concerned with designing networks to improve the prognostic accuracy of IPF. The source-code for Fibro-CoSANet is available at: \url{https://github.com/zabir-nabil/Fibro-CoSANet}.
description: 12 Pages
Dadaya macrops
Creators: name: Santos, Arielly De S.
name: Andrade, Daniel Da S.
name: Sousa, Francisco Diogo Rocha
name: Mugnai, Riccardo
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Diplostraca
Chydoridae
Dadaya
Dadaya macrops

description: Dadaya macrops (Daday, 1898) (Figs. 4 A–C)
Material examined. 10 specimens, collection number CINCAA 0052
Remarks. Described from the material from the Sri Lanka region by Daday (1898) as Alona macrops Sars (1901) named the genus Dadaya Sars, 1901. The genus is monospecific and Dadaya ocellata Bergamin (1931) is still considered synonymous with D. macrops (Smirnov 1974; Elmoor-Loureiro 1997). This suggestion still needs investigation involving the analysis of populations from different regions of the world (Elmoor-Loureiro 2010). The most striking morphological trait of the species is the oval body with a markedly large ocellus, pointed rostrum and a single cephalic pore (Fig. 4B) (Smirnov 1996; Elmoor-Loureiro 2000).
In Table 1 we can find the distribution of Cladocera for the state of Maranh„o and in Table 2 the list of Cladocera of Maranh„o state (modified from Santos et al. 2021).
description: Published as part of Santos, Arielly De S., Andrade, Daniel Da S., Sousa, Francisco Diogo Rocha & Mugnai, Riccardo, 2023, Three new records of Cladocera (Crustacea: Branchiopoda) for the State of Maranhão, Northeastern Brazil, pp. 224-234 in Zootaxa 5319 (2) on pages 227-228, DOI: 10.11646/zootaxa.5319.2.4, http://zenodo.org/record/8182487
Quantum correlations across the horizon in acoustic and gravitational Black Holes
Creators: name: Balbinot, Roberto
name: Fabbri, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate, within the framework of Quantum Field Theory in curved space, the correlations across the horizon of a black hole in order to highlight the particle-partner pair creation mechanism at the origin of Hawking radiation. The analysis concerns both acoustic black holes, formed by Bose-Einstein condensates, and gravitational black holes. More precisely, we have considered a typical acoustic black hole metric with two asymptotic homogeneous regions and the Schwarzschild metric as describing a gravitational black hole. By considering equal time correlation functions, we find a striking disagreement between the two cases: the expected characteristic peak centered along the trajectories of the Hawking particles and their partners seems to appear only for the acoustic black hole and not for the gravitational Schwarzschild one. The reason for that is the existence of a 'quantum atmosphere' displaced from the horizon as the locus of origin of Hawking radiation together, and this is the crucial aspect, with the presence of a central singularity in the gravitational case swallowing everything is trapped inside the horizon. Correlations however are not absent in the gravitational case: to see them one has simply to consider correlation functions at unequal times which indeed display the expected peak.
description: 35 pages, 16 figures. Final version
D2: Terms of Reference for CESSDA Vocabulary Service
Creators: name: Jääskeläinen, Taina
Publisher: name: Zenodo
Year: 2021
Subjects: CVS
DDI
Controlled Vocabulary
Metadata
Social Science

description: The CESSDA Vocabulary Service (CVS) allows communities and organisations to host and publish their own vocabularies for users to search and download. For this, CESSDA has developed a tool that provides both a discovery interface where vocabularies can be searched, browsed and downloaded and an editing interface where the vocabularies are managed and translated. The editor also includes an access and user management interface and allows versioning with persistent identifiers and citation of the controlled vocabularies. All content is available through an API. This document specifies the different roles and responsibilities related to the CESSDA Vocabulary Service.
Multiwavelength analysis of the intriguing GRB 061126: the reverse shock scenario and magnetization
Creators: name: Gomboc, A.
name: Kobayashi, S.
name: Guidorzi, C.
name: Melandri, A.
name: Mangano, V.
name: Sbarufatti, B.
name: Mundell, C. G.
name: Schady, P.
name: Smith, R. J.
name: Updike, A. C.
name: Kann, D. A.
name: Misra, K.
name: Rol, E.
name: Pozanenko, A.
name: Castro-Tirado, A. J.
name: Anupama, G. C.
name: Bersier, D.
name: Bode, M. F.
name: Carter, D.
name: Curran, P.
name: Fruchter, A.
name: Graham, J.
name: Hartmann, D. H.
name: Ibrahimov, M.
name: Levan, A.
name: Monfardini, A.
name: Mottram, C. J.
name: O'Brien, P. T.
name: Prema, P.
name: Sahu, D. K.
name: Steele, I. A.
name: Tanvir, N. R.
name: Wiersema, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data and multi-color optical imaging from ten ground-based telescopes. GRB 061126 was a long burst (T_90=191 s) with four overlapping peaks in its gamma-ray light curve. The X-ray afterglow, observed from 26 min to 20 days after the burst, shows a simple power-law decay with alpha_X=1.290 \pm 0.008. Optical observations presented here cover the time range from 258 s (Faulkes Telescope North) to 15 days (Gemini North) after the burst; the decay rate of the optical afterglow shows a steep-to-shallow transition (from alpha_1=1.48 \pm 0.06 to alpha_2=0.88 \pm 0.03) approximately 13 min after the burst. We suggest the early, steep component is due to a reverse shock and show that the magnetic energy density in the ejecta, expressed as a fraction of the equipartion value, is a few ten times larger than in the forward shock in the early afterglow phase. The ejecta might be endowed with primordial magnetic fields at the central engine. The optical light curve implies a late-time break at about 1.5 days after the burst, while there is no evidence of the simultaneous break in the X-ray light curve. We model the broad band emission and show that some afterglow characteristics (the steeper decay in X-ray and the shallow spectral index from optical to X-ray) are difficult to explain in the framework of the standard fireball model. This might imply that the X-ray afterglow is due to an additional emission process, such as late time central engine activity rather than blast-wave shock emission. The possible chromatic break at 1.5 days after the burst would give support to the additional emission scenario.
description: 14 pages, 10 figures, 1 table; Accepted for publication in ApJ
Intervening Metal Systems in GRB and QSO sight-lines: The Mgii and Civ Question
Creators: name: Sudilovsky, Vladimir
name: Savaglio, Sandra
name: Vreeswijk, Paul
name: Ledoux, Cedric
name: Smette, Alain
name: Greiner, Jochen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Prochter et al. 2006 recently found that the number density of strong intervening 0.5
description: 21 pages, 4 figures, ApJ accepted, Revised after Referee Report
Existence of optimizers in a Sobolev inequality for vector fields
Creators: name: Frank, Rupert L.
name: Loss, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the minimization problem corresponding to a Sobolev inequality for vector fields and show that minimizing sequences are relatively compact up to the symmetries of the problem. In particular, there is a minimizer. An ingredient in our proof is a version of the Rellich--Kondrachov compactness theorem for sequences satisfying a nonlinear constraint.
description: 31 pages. This is the publication version, incorporating the journal style
Appendix.txt
Creators: name: Kusano, Tamotsu
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 310307
subject: Population ecology

description: Seasonal activity of the Japanese red-bellied newt, Cynops pyrrhogaster, was monitored. The number of newts in the water of a pond was counted immediately after sunset, at least once a week, except in winter. The number of newts counted varied daily, and the time-series data on newt activity were analyzed using state-space modeling to estimate the impact of weather conditions and lunar phase on the activity due to the presence of plausible temporal autocorrelation.
Aspects of CP violation in the HZZ coupling at the LHC
Creators: name: Godbole, Rohini M.
name: Miller, David J.
name: Mühlleitner, M. Margarete
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the CP-conserving (CPC) and CP-violating (CPV) effects of a general HZZ coupling through a study of the process H -> ZZ* -> 4 leptons at the LHC. We construct asymmetries that directly probe these couplings. Further, we present complete analytical formulae for the angular distributions of the decay leptons and for some of the asymmetries. Using these we have been able to identify new observables which can provide enhanced sensitivity to the CPV $H ZZ$ coupling. We also explore probing CP violation through shapes of distributions in different kinematic variables, which can be used for Higgs bosons with mH < 2 mZ.
description: 36 pages, 17 figures, LaTeX, version accepted for publication
Machine learning astrophysics from 21 cm lightcones: impact of network architectures and signal contamination
Creators: name: Prelogović, David
name: Mesinger, Andrei
name: Murray, Steven
name: Fiameni, Giuseppe
name: Gillet, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Imaging the cosmic 21 cm signal will map out the first billion years of our Universe. The resulting 3D lightcone (LC) will encode the properties of the unseen first galaxies and physical cosmology. Here, we build on previous work using neural networks (NNs) to infer astrophysical parameters directly from 21 cm LC images. We introduce recurrent neural networks (RNNs), capable of efficiently characterizing the evolution along the redshift axis of 21 cm LC images. Using a large database of simulated cosmic 21 cm LCs, we compare the relative performance in parameter estimation of different network architectures. These including two types of RNNs, which differ in their complexity, as well as a more traditional convolutional neural network (CNN). For the ideal case of no instrumental effects, our simplest and easiest to train RNN performs the best, with a mean squared parameter estimation error (MSE) that is lower by a factor of $\ge 2$ compared with the other architectures studied here, and a factor of $\ge 8$ lower than the previously-studied CNN. We also corrupt the cosmic signal by adding noise expected from a 1000 h integration with the Square Kilometre Array, as well as excising a foreground-contaminated 'horizon wedge'. Parameter prediction errors increase when the NNs are trained on these contaminated LC images, though recovery is still good even in the most pessimistic case (with $R^2 \ge 0.5-0.95$). However, we find no notable differences in performance between network architectures on the contaminated images. We argue this is due to the size of our data set, highlighting the need for larger data sets and/or better data augmentation in order to maximize the potential of NNs in 21 cm parameter estimation.
description: 15 pages, 11 figures, updated to match the version published in MNRAS, minor changes
TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
Creators: name: Abdo, A. A.
name: Allen, B.
name: Berley, D.
name: Casanova, S.
name: Chen, C.
name: Coyne, D. G.
name: Dingus, B. L.
name: Ellsworth, R. W.
name: Fleysher, L.
name: Fleysher, R.
name: Gonzalez, M. M.
name: Goodman, J. A.
name: Hays, E.
name: Hoffman, C. M.
name: Hopper, B.
name: Huntemeyer, P. H.
name: Kolterman, B. E.
name: Lansdell, C. P.
name: Linnemann, J. T.
name: McEnery, J. E.
name: Mincer, A. I.
name: Nemethy, P.
name: Noyes, D.
name: Ryan, J. M.
name: Parkinson, P. M. Saz
name: Shoup, A.
name: Sinnis, G.
name: Smith, A. J.
name: Sullivan, G. W.
name: Vasileiou, V.
name: Walker, G. P.
name: Williams, D. A.
name: Xu, X. W.
name: Yodh, G. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A survey of Galactic gamma-ray sources at a median energy of ~20 TeV has been performed using the Milagro Gamma Ray Observatory. Eight candidate sources of TeV emission are detected with pre-trials significance $>4.5σ$ in the region of Galactic longitude $l\in[30^\circ,220^\circ]$ and latitude $b\in[-10^\circ,10^\circ]$. Four of these sources, including the Crab nebula and the recently published MGRO J2019+37, are observed with significances $>4σ$ after accounting for the trials involved in searching the 3800 square degree region. All four of these sources are also coincident with EGRET sources. Two of the lower significance sources are coincident with EGRET sources and one of these sources is Geminga. The other two candidates are in the Cygnus region of the Galaxy. Several of the sources appear to be spatially extended. The fluxes of the sources at 20 TeV range from ~25% of the Crab flux to nearly as bright as the Crab.
description: Submitted to ApJ