cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High--cadence observations of spicular-type events on the Sun
Creators: name: Shetye, J.
name: Doyle, J. G.
name: Scullion, E.
name: Nelson, C. J.
name: Kuridze, D.
name: Henriques, V.
name: Woeger, F.
name: Ray, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Chromospheric observations taken at high cadence and high spatial resolution show a range of spicule like features, including Type I, Type II (as well as RBEs and RREs) and those which seem to appear within a few seconds, which if interpreted as flows would imply mass flow velocities in excess of 1000 km/s. This article seeks to quantify and study rapidly appearing spicular type events. We also compare the MOMFBD and speckle reconstruction techniques in order to understand if such spicules are more favourably observed using a particular technique. We use spectral imaging observations taken with the CRISP on the Swedish 1 m Solar Telescope. Data was sampled at multiple positions within the Halpha line profile for both an ondisk and limb location. The data is host to numerous rapidly appearing features which are observed at different locations within the Halpha line profile. The feature's durations vary between 10 and 20 s and lengths around 3500 km. Sometimes, a time delay in their appearance between the blue and red wings of 3 and 5 s is evident, whereas sometimes they are near simultaneous. In some instances features are observed to fade and then re emerge at the same location several tens of seconds later. We provide the first statistical analysis of these spicules and suggest that these observations can be interpreted as the LOS movement of highly dynamic spicules moving in and out of the narrow 60 mA transmission filter used to observe in different parts of the Halpha line profile. The LOS velocity component of the observed fast chromospheric features, manifested as Doppler shifts, are responsible for their appearance in the red and blue wings of Halpha line. Additional work involving data at other wavelengths is required to investigate the nature of their possible wavelike activity.
description: 15 pages, 13 figs
Nanotubes Motion on Layered Materials: A Registry Perspective
Creators: name: Oz, Inbal
name: Leven, Itai
name: Itkin, Yaron
name: Buchwalter, Asaf
name: Akulov, Katherine
name: Hod, Oded
Publisher: name: arXiv
Year: 2015
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: At dry and clean material junctions of rigid materials the corrugation of the sliding energy landscape is dominated by variations of Pauli repulsions. These occur when electron clouds centered around atoms in adjacent layers overlap as they slide across each other. In such cases there exists a direct relation between interfacial surface (in)commensurability and superlubricity, a frictionless and wearless tribological state. The Registry Index is a purely geometrical parameter that quantifies the degree of interlayer commensurability, thus providing a simple and intuitive method for the prediction of sliding energy landscapes at rigid material interfaces. In the present study, we extend the applicability of the Registry Index to non-parallel surfaces, using a model system of nanotubes motion on flat hexagonal materials. Our method successfully reproduces sliding energy landscapes of carbon nanotubes on Graphene calculated using a Lennard-Jones type and the Kolmogorov-Crespi interlayer potentials. Furthermore, it captures the sliding energy corrugation of a boron nitride nanotube on hexagonal boron nitride calculated using the h-BN ILP. Finally, we use the Registry Index to predict the sliding energy landscapes of the heterogeneous junctions of a carbon nanotubes on hexagonal boron nitride and of boron nitride nanotubes on graphene that are shown to exhibit a significantly reduced corrugation. For such rigid interfaces this is expected to be manifested by superlubric motion.
description: 13 pages, 4 figures
Testing the dark matter scenario in the inert doublet model by future precision measurements of the Higgs boson couplings
Creators: name: Kanemura, Shinya
name: Kikuchi, Mariko
name: Sakurai, Kodai
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We evaluate radiative corrections to the Higgs boson couplings in the inert doublet model, in which the lightest component of the $Z_2^{}$ odd scalar doublet field can be a dark matter candidate. The one-loop contributions to the $hVV$, $hff$ and $hhh$ couplings are calculated in the on-shell scheme, where $h$ is the Higgs boson with the mass 125 GeV, $V$ represents a weak gauge boson and $f$ is a fermion. We investigate how the one-loop corrected Higgs boson couplings can be deviated from the predictions in the standard model under the constraints from perturbative unitarity and vacuum stability in the scenario where the model can explain current dark matter data. When the mass of the dark matter is slightly above a half of the Higgs boson mass, it would be difficult to test the model by the direct search experiments for dark matter. We find that in such a case the model can be tested at future collider experiments by either the direct search of heavier inert particles or precision measurements of the Higgs boson couplings.
description: 27 pages, 7 figures
Online Data-Driven Adaptive Control for Unknown Linear Time-Varying Systems
Creators: name: Liu, Shenyu
name: Chen, Kaiwen
name: Eising, Jaap
Publisher: name: arXiv
Year: 2024
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a novel online data-driven adaptive control for unknown linear time-varying systems. Initialized with an empirical feedback gain, the algorithm periodically updates this gain based on the data collected over a short time window before each update. Meanwhile, the stability of the closed-loop system is analyzed in detail, which shows that under some mild assumptions, the proposed online data-driven adaptive control scheme can guarantee practical global exponential stability. Finally, the proposed algorithm is demonstrated by numerical simulations and its performance is compared with other control algorithms for unknown linear time-varying systems.
description: Technical report for the conference paper in 62nd IEEE CDC
Pancreatitis and Mortality in Type 2 diabetes Patients: A Population-Based Cohort Study on 2.7 Million Adults in Korea
Creators: name: Cho, Yun Kyung
name: Lee, Kyung Do
name: Roh, Eun
name: Huh, Ji Hye
name: Kang, Jun Goo
name: Lee, Seong Jin
name: Ihm, Sung-Hee
Publisher: name: figshare
Year: 2023
Subjects: Metabolic medicine

description: This is the supplementary appendix of the manuscript " Pancreatitis and Mortality in Type 2 diabetes Patients: A Population-Based Cohort Study on 2.7 Million Adults in Korea". This study included 2,746,988 patients with type 2 diabetes aged ≥20 years who underwent a National Health Insurance System health examination. This study was approved by the NHIS inquiry commission and the Institutional Review Board of Soongsil University (authorization number, SSU-202003-HR-201-01)
Data-Driven CFD Modeling of Turbulent Flows Through Complex Structures
Creators: name: Wang, Jian-Xun
name: Xiao, Heng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The growth of computational resources in the past decades has expanded the application of Computational Fluid Dynamics (CFD) from the traditional fields of aerodynamics and hydrodynamics to a number of new areas. Examples range from the heat and fluid flows in nuclear reactor vessels and in data centers to the turbulence flows through wind turbine farms and coastal vegetation plants. However, in these new applications complex structures are often exist (e.g., rod bundles in reactor vessels and turbines in wind farms), which makes fully resolved, first-principle based CFD modeling prohibitively expensive. This obstacle seriously impairs the predictive capability of CFD models in these applications. On the other hand, a limited amount of measurement data is often available in the systems in the above-mentioned applications. In this work we propose a data-driven, physics-based approach to perform full field inversion on the effects of the complex structures on the flow. This is achieved by assimilating observation data and numerical model prediction in an iterative Ensemble Kalman method. Based on the inversion results, the velocity and turbulence of the flow field can be obtained. A major novelty of the present contribution is the non-parametric, full field inversion approach adopted, which is in contrast to the inference of coefficient in the ad hoc models often practiced in previous works. The merits of the proposed approach are demonstrated on the flow past a porous disk by using both synthetic data and real experimental measurements. The spatially varying drag forces of the porous disk on the flow are inferred. The proposed approach has the potential to be used in the monitoring of complex system in the above mentioned applications.
Exact simulation of the Wright-Fisher diffusion
Creators: name: Jenkins, Paul A.
name: Spano, Dario
Publisher: name: arXiv
Year: 2015
Subjects: subject: Methodology (stat.ME)
subject: Probability (math.PR)
subject: Populations and Evolution (q-bio.PE)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 65C05 (Primary), 60H35, 60J60, 92D15 (Secondary)

description: The Wright-Fisher family of diffusion processes is a widely used class of evolutionary models. However, simulation is difficult because there is no known closed-form formula for its transition function. In this article we demonstrate that it is in fact possible to simulate exactly from a broad class of Wright-Fisher diffusion processes and their bridges. For those diffusions corresponding to reversible, neutral evolution, our key idea is to exploit an eigenfunction expansion of the transition function; this approach even applies to its infinite-dimensional analogue, the Fleming-Viot process. We then develop an exact rejection algorithm for processes with more general drift functions, including those modelling natural selection, using ideas from retrospective simulation. Our approach also yields methods for exact simulation of the moment dual of the Wright-Fisher diffusion, the ancestral process of an infinite-leaf Kingman coalescent tree. We believe our new perspective on diffusion simulation holds promise for other models admitting a transition eigenfunction expansion.
description: 36 pages, 2 figure, 2 tables. This version corrects minor errors in the statements of Propositions 6 and 7
Laboratory validation of the dual-zone phase mask coronagraph in broadband light at the high-contrast imaging THD-testbed
Creators: name: Delorme, J. R.
name: N'Diaye, M.
name: Galicher, R.
name: Dohlen, K.
name: Baudoz, P.
name: Caillat, A.
name: Rousset, G.
name: Soummer, R.
name: Dupuis, O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Specific high contrast imaging instruments are mandatory to characterize circumstellar disks and exoplanets around nearby stars. Coronagraphs are commonly used in these facilities to reject the diffracted light of an observed star and enable the direct imaging and spectroscopy of its circumstellar environment. One important property of the coronagraph is to be able to work in broadband light. Among several proposed coronagraphs, the dual-zone phase mask coronagraph is a promising solution for starlight rejection in broadband light. In this paper, we perform the first validation of this concept in laboratory. First, we recall the principle of the dual-zone phase mask coronagraph. Then, we describe the high-contrast imaging THD testbed, the manufacturing of the components and the quality-control procedures. Finally, we study the sensitivity of our coronagraph to low-order aberrations (inner working angle and defocus) and estimate its contrast performance. Our experimental broadband light results are compared with numerical simulations to check agreement with the performance predictions. With the manufactured prototype and using a dark hole technique based on the self-coherent camera, we obtain contrast levels down to $2\,10^{-8}$ between 5 and 17$\,λ_0/D$ in monochromatic light (640 nm). We also reach contrast levels of $4\,10^{-8}$ between 7 and 17$λ_0/D$ in broadband ($λ_0=675$ nm, $Δλ=250$ nm and $Δλ/ λ_0 = 40$ %), which demonstrates the excellent chromatic performance of the dual-zone phase mask coronagraph. The performance reached by the dual-zone phase mask coronagraph is promising for future high-contrast imaging instruments that aim at detecting and spectrally characterizing old or light gaseous planets.
description: 9 pages, 16 figures
Relations Between Adjacency and Modularity Graph Partitioning
Creators: name: Jiang, Hansi
name: Meyer, Carl
Publisher: name: arXiv
Year: 2015
Subjects: subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 05C50, 15A18, 62H30, 90C59

description: This paper develops the exact linear relationship between the leading eigenvector of the unnormalized modularity matrix and the eigenvectors of the adjacency matrix. We propose a method for approximating the leading eigenvector of the modularity matrix, and we derive the error of the approximation. There is also a complete proof of the equivalence between normalized adjacency clustering and normalized modularity clustering. Numerical experiments show that normalized adjacency clustering can be as twice efficient as normalized modularity clustering.
description: 12 pages
LCK rank of locally conformally Kahler manifolds with potential
Creators: name: Ornea, Liviu
name: Verbitsky, Misha
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: An LCK manifold with potential is a compact quotient of a Kahler manifold $X$ equipped with a positive Kahler potential $f$, such that the monodromy group acts on $X$ by holomorphic homotheties and multiplies $f$ by a character. The LCK rank is the rank of the image of this character, considered as a function from the monodromy group to real numbers. We prove that an LCK manifold with potential can have any rank between 1 and $b_1(M)$. Moreover, LCK manifolds with proper potential (ones with rank 1) are dense. Two errata to our previous work are given in the last Section.
description: 14 pages. Supersedes arXiv:1512.00968. Contains errata to arXiv:math/0305259
Trichopria isis Nixon 1980
Creators: name: Notton, David G.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Mymaridae
Trichopria
Trichopria isis

description: Trichopria isis Nixon, 1980: 33.
Valid name
Trichopria aequata (Thomson, 1858).
Summary of types
Holotype ♀, BMNH number 9.826, by original designation. Paratypes 2 ♀♀.
Primary type data
Farley, S.H./ 12.vi.1938 / R.B.Benson/ B.M.1938-190; Trichopria / isis Nixon / type ♀, 1977.
Type locality
England, Hants, Farley.
Remarks
The holotype is mounted on a card point and is entire.
description: Published as part of Notton, David G., 2014, A catalogue of the types of Diapriinae (Hymenoptera, Diapriidae) at the Natural History Museum, London, pp. 1-123 in European Journal of Taxonomy 75 on page 100, DOI: 10.5852/ejt.2014.75, http://zenodo.org/record/3862773
Determination of the turbulent parameter in the accretion disks: effects of self-irradiation in 4U 1543-47 during the 2002 outburst
Creators: name: Lipunova, G. V.
name: Malanchev, K. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the viscous evolution of the accretion disk in 4U 1543-47, a black hole binary system, during the first 30 days after the peak of the 2002 burst by comparing the observed and theoretical accretion rate evolution $\dot M(t)$. The observed $\dot M(t)$ is obtained from spectral modelling of the archival RXTE/PCA data. Different scenarios of disk decay evolution are possible depending on a degree of self-irradiation of the disk by the emission from its centre. If the self-irradiation, which is parametrized by factor $C_\mathrm{irr}$, had been as high as $\sim 5\times10^{-3}$, then the disk would have been completely ionized up to the tidal radius and the short time of the decay would have required the turbulent parameter $α\sim 3$. We find that the shape of the $\dot M(t)$ curve is much better explained in a model with a shrinking high-viscosity zone. If $C_\mathrm{irr}\approx(2-3)\times 10^{-4}$, the resulting $α$ lie in the interval $0.5-1.5$ for the black hole masses in the range $6-10~\mathrm{M}_\odot$, while the radius of the ionized disk is variable and controlled by irradiation. For very weak irradiation, $C_\mathrm{irr} < 1.5 \times10^{-4}$, the burst decline develops as in normal outbursts of dwarf novae with $α\sim 0.08-0.32$. The optical data indicate that $C_\mathrm{irr}$ in 4U 1543-47 (2002) was not greater than approximately $(3-6)\times10^{-4}$. Generally, modelling of an X-ray nova burst allows one to estimate $α$ that depends on the black hole parameters. We present the public 1-D code Freddi to model the viscous evolution of an accretion disk. Analytic approximations are derived to estimate $α$ in X-ray novae using $\dot M(t)$.
description: 13 pages, 14 figures. Accepted for publication in MNRAS. Code Freddi is publicly available at http://xray.sai.msu.ru/~malanchev/freddi/ V3 fixes a typo in an equation on page 3, we thank Ankit Mishra for pointing it out to us
Grain size correlated rotatable magnetic anisotropy in polycrystalline exchange bias systems
Creators: name: Müglich, Nicolas David
name: Götz, Gerhard
name: Gaul, Alexander
name: Meyl, Markus
name: Reiss, Günter
name: Kuschel, Timo
name: Ehresmann, Arno
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Angular resolved measurements of the exchange bias field and the coercive field are a powerful tool to distinguish between different competing magnetic anisotropies in polycrystalline exchange bias layer systems. No simple analytical model is as yet available, which considers time dependent effects like enhanced coercivity arising from the grain size distribution of the antiferromagnet. In this work we expand an existing model class describing polycrystalline exchange bias systems by a rotatable magnetic anisotropy term to describe grain size correlated effects. Additionally, we performed angular resolved magnetization curve measurements using vectorial magnetooptic Kerr magnetometry. Comparison of the experimental data with the proposed model shows excellent agreement and reveals the ferromagnetic anisotropy and properties connected to the grain size distribution of the antiferromagnet. Therefore, a distinction between the different influences on coercivity and anisotropy becomes available.
description: 9 pages, 9 figures
Revealing the Nature of Extreme Coronal-line Emitter SDSS J095209.56+214313.3
Creators: name: Palaversa, Lovro
name: Gezari, Suvi
name: Sesar, Branimir
name: Stuart, J. Scott
name: Wozniak, Przemyslaw
name: Holl, Berry
name: Ivezić, Željko
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Extreme coronal-line emitter (ECLE) SDSSJ095209.56+214313.3, known by its strong, fading, high ionization lines, has been a long standing candidate for a tidal disruption event, however a supernova origin has not yet been ruled out. Here we add several new pieces of information to the puzzle of the nature of the transient that powered its variable coronal lines: 1) an optical light curve from the Lincoln Near Earth Asteroid Research (LINEAR) survey that serendipitously catches the optical flare, and 2) late-time observations of the host galaxy with the Swift Ultraviolet and Optical Telescope (UVOT) and X-ray telescope (XRT) and the ground-based Mercator telescope. The well-sampled, $\sim10$-year long, unfiltered LINEAR light curve constrains the onset of the flare to a precision of $\pm5$ days and enables us to place a lower limit on the peak optical magnitude. Difference imaging allows us to estimate the location of the flare in proximity of the host galaxy core. Comparison of the \textsl{GALEX} data (early 2006) with the recently acquired Swift UVOT (June 2015) and Mercator observations (April 2015) demonstrate a decrease in the UV flux over a $\sim 10$ year period, confirming that the flare was UV-bright. The long-lived UV-bright emission, detected 1.8 rest-frame years after the start of the flare, strongly disfavors a SN origin. These new data allow us to conclude that the flare was indeed powered by the tidal disruption of a star by a supermassive black hole and that TDEs are in fact capable of powering the enigmatic class of ECLEs.
description: Submitted to ApJ
A Survey of Chemical Separation in Accreting Neutron Stars
Creators: name: Mckinven, Ryan
name: Cumming, Andrew
name: Medin, Zach
name: Schatz, Hendrik
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The heavy element ashes of rp-process hydrogen and helium burning in accreting neutron stars are compressed to high density where they freeze, forming the outer crust of the star. We calculate the chemical separation on freezing for a number of different nuclear mixtures resulting from a range of burning conditions for the rp-process. We confirm the generic result that light nuclei are preferentially retained in the liquid and heavy nuclei in the solid. This is in agreement with the previous study of a 17-component mixture of rp-process ashes by Horowitz et al. (2007), but extends that result to a much larger range of compositions. We also find an alternate phase separation regime for the lightest ash mixtures which does not demonstrate this generic behaviour. With a few exceptions, we find that chemical separation reduces the expected $Q_{\rm imp}$ in the outer crust compared to the initial rp-process ash, where $Q_{\rm imp}$ measures the mean-square dispersion in atomic number $Z$ of the nuclei in the mixture. We find that the fractional spread of $Z$ plays a role in setting the amount of chemical separation and is strongly correlated to the divergence between the two/three-component approximations and the full component model. The contrast in $Y_e$ between the initial rp-process ashes and the equilibrium liquid composition is similar to that assumed in earlier two-component models of compositionally driven convection, except for very light compositions which produce nearly negligible convective driving. We discuss the implications of these results for observations of accreting neutron stars.
The Void Galaxy Survey: Star Formation Properties
Creators: name: Beygu, B.
name: Kreckel, K.
name: van der Hulst, J. M.
name: Jarrett, T. H
name: Peletier, R.
name: van de Weygaert, R.
name: van Gorkom, J. H.
name: Aragon-Calvo, M. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the star formation properties of 59 void galaxies as part of the Void Galaxy Survey (VGS). Current star formation rates are derived from $\rm{Hα}$ and recent star formation rates from near-UV imaging. In addition, infrared 3.4 $\rm{μm}$, 4.6 $\rm{μm}$, 12 $\rm{μm}$ and 22 $\rm{μm}$ WISE emission is used as star formation and mass indicator. Infrared and optical colours show that the VGS sample displays a wide range of dust and metallicity properties. We combine these measurements with stellar and HI masses to measure the specific SFRs ($\rm{SFR/M_{*}}$) and star formation efficiencies ($\rm{SFR/M_{HI}}$). We compare the star formation properties of our sample with galaxies in the more moderate density regions of the cosmic web, 'the field'. We find that specific SFRs of the VGS galaxies as a function of stellar and HI mass are similar to those of the galaxies in these field regions. Their $\rm{SFRα}$ is slightly elevated than the galaxies in the field for a given total HI mass. In the global star formation picture presented by Kennicutt-Schmidt, VGS galaxies fall into the regime of low average star formation and correspondingly low HI surface density. Their mean $\rm{SFRα/M_{HI}}$ and $\rm{SFRα/M_{*}}$ are of the order of $\rm{10^{-9.9}}$ $\rm{yr^{-1}}$. We conclude that while the large scale underdense environment must play some role in galaxy formation and growth through accretion, we find that even with respect to other galaxies in the more mildly underdense regions, the increase in star formation rate is only marginal.
description: 18 pages, 17 figures, accepted for publication in MNRAS
Fourier-Mukai transform on Weierstrass cubics and commuting differential operators
Creators: name: Burban, Igor
name: Zheglov, Alexander
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: In this article, we describe the spectral sheaves of algebras of commuting differential operators of genus one and rank two with singular spectral curve, solving a problem posed by Previato and Wilson. We also classify all indecomposable semi-stable sheaves of slope one and ranks two or three on a cuspidal Weierstrass cubic.
Striated Populations in Disordered Environments with Advection
Creators: name: Chotibut, Thiparat
name: Nelson, David R.
name: Succi, Sauro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Growth in static and controlled environments such as a Petri dish can be used to study the spatial population dynamics of microorganisms. However, natural populations such as marine microbes experience fluid advection and often grow up in heterogeneous environments. We investigate a generalized Fisher-Kolmogorov-Petrovsky-Piscounov (FKPP) equation describing single species population subject to a constant flow field and quenched random spatially inhomogeneous growth rates with a fertile overall growth condition. We analytically and numerically demonstrate that the non-equilibrium steady-state population density develops a flow-driven striation pattern. The striations are highly asymmetric with a longitudinal correlation length that diverges linearly with the flow speed and a transverse correlation length that approaches a finite velocity-independent value. Linear response theory is developed to study the statistics of the steady states. Theoretical predictions show excellent agreement with the numerical steady states of the generalized FKPP equation obtained from Lattice Boltzmann simulations. These findings suggest that, although the growth disorder can be spatially uncorrelated, correlated population structures with striations emerge naturally at sufficiently strong advection.
description: 30 pages, 8 figures
Epidendrum ramosum var. lanceolatum Grisebach 1864
Creators: name: Steudel, Bastian
name: Appelhans, Marc S.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Epidendrum
Epidendrum ramosum
Epidendrum ramosum var. lanceolatum grisebach (1864: 618)

description: Epidendrum ramosum var. lanceolatum Grisebach (1864: 618)
 Lectotype (designated here): JAMAICA. S.d., March 1251 (GOET 009088!).
 Syntype: CUBA. 1860–1864, Wright no. 3333 (GOET 013860!).
 We selected March 1251 (GOET 009088) as the lectotype since this specimen bears flowers. Additionally, Grisebach (1864: 618) cited all collections from Jamaica on trees and rocks as var. α (type variety) and var. β (var. lanceolatum), whereas he did not differentiate which variant was found in Dominica, Cuba, and Mexico to Brazil.
description: Published as part of Steudel, Bastian & Appelhans, Marc S., 2016, Newly discovered orchid types (Orchidaceae) in the Herbarium Gottingense with selected lectotypifications, pp. 235-246 in Phytotaxa 243 (3) on page 236, DOI: 10.11646/phytotaxa.243.3.2, http://zenodo.org/record/13679995
Inference on an heteroscedastic Gompertz tumor growth model
Creators: name: Albano, Giuseppina
name: Giorno, Virginia
name: Román-Román, Patricia
name: Román-Román, Sergio
name: Serrano-Pérez, Juan José
name: Torres-Ruiz, Francisco
Publisher: name: arXiv
Year: 2024
Subjects: subject: Methodology (stat.ME)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 60H20, 60J60

description: We consider a non homogeneous Gompertz diffusion process whose parameters are modified by generally time-dependent exogenous factors included in the infinitesimal moments. The proposed model is able to describe tumor dynamics under the effect of anti-proliferative and/or cell death-induced therapies. We assume that such therapies can modify also the infinitesimal variance of the diffusion process. An estimation procedure, based on a control group and two treated groups, is proposed to infer the model by estimating the constant parameters and the time-dependent terms. Moreover, several concatenated hypothesis tests are considered in order to confirm or reject the need to include time-dependent functions in the infinitesimal moments. Simulations are provided to evaluate the efficiency of the suggested procedures and to validate the testing hypothesis. Finally, an application to real data is considered.
description: 44 pages, 63 figures. Includes Material Supplementary
The Suppression of Radiation Reaction and Laser Field Depletion in Laser-Electron beam interaction
Creators: name: Ong, J. F.
name: Moritaka, T.
name: Takabe, H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The effects of radiation reaction (RR) have been studied extensively by using the ultraintense laser interacts with the counter-propagating relativistic electron. At the laser intensity at the order of $10^{23}$ W/cm$^2$, the effects of RR are significant in a few laser period for a relativistic electron. However, the laser at such intensity is tightly focused and the laser energy is usually assumed to be fixed. Then, the signal of RR and energy conservation cannot be guaranteed. To assess the effects of RR in a tightly focused laser pulse and the evolution of the laser energy, we simulate this interaction with a beam of $10^9$ electrons by means of Particle-in-Cell (PIC) method. We observed that the effects of RR are suppressed due to the ponderomotive force and accompanied by a non-negligible amount of laser field energy reduction. This is due to the ponderomotive force that prevents the electrons from approaching the center of the laser pulse and leads to the interaction at weaker field region. At the same time, the laser energy is absorbed through ponderomotive acceleration. Thus, the kinetic energy of the electron beam has to be carefully selected such that the effects of RR become obvious.
description: 6 pages, 3 figures
A microservice architecture for real-time IoT data processing: A reusable Web of things approach for smart ports
Creators: name: Ortiz, Guadalupe
name: Boubeta-Puig, Juan
name: Criado, Javier
name: Corral-Plaza, David
name: Garcia-de-Prado, Alfonso
name: Medina-Bulo, Inmaculada
name: Iribarne, Luis
Publisher: name: arXiv
Year: 2024
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Major advances in telecommunications and the Internet of Things have given rise to numerous smart city scenarios in which smart services are provided. What was once a dream for the future has now become reality. However, the need to provide these smart services quickly, efficiently, in an interoperable manner and in real time is a cutting-edge technological challenge. Although some software architectures offer solutions in this area, these are often limited in terms of reusability and maintenance by independent modules, involving the need for system downtime when maintaining or evolving, as well as by a lack of standards in terms of the interoperability of their interface. In this paper, we propose a fully reusable microservice architecture, standardized through the use of the Web of things paradigm, and with high efficiency in real-time data processing, supported by complex event processing techniques. To illustrate the proposal, we present a fully reusable implementation of the microservices necessary for the deployment of the architecture in the field of air quality monitoring and alerting in smart ports. The performance evaluation of this architecture shows excellent results.
Multiple front standing waves in the FitzHugh-Nagumo equations
Creators: name: Chen, Chao-Nien
name: Séré, Eric
Publisher: name: arXiv
Year: 2018
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: There have been several existence results for the standing waves of FitzHugh-Nagumo equations. Such waves are the connecting orbits of an autonomous second-order Lagrangian system and the corresponding kinetic energy is an indefinite quadratic form in the velocity terms. When the system has two stable hyperbolic equilibria, there exist two stable standing fronts, which will be used in this paper as building blocks, to construct stable standing waves with multiple fronts in case the equilibria are of saddle-focus type. The idea to prove existence is somewhat close in spirit to [Buffoni-Sere, CPAM 49, 285-305]. However several differences are required in the argument: facing a strongly indefinite functional, we need to perform a nonlo-cal Lyapunov-Schmidt reduction; in order to justify the stability of multiple front standing waves, we rely on a more precise variational characterization of such critical points. Based on this approach, both stable and unstable standing waves are established.
description: Final version to appear in Journal of Differential Equations
Partial Replanning for Decentralized Dynamic Task Allocation
Creators: name: Buckman, Noam
name: Choi, Han-Lim
name: How, Jonathan P.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Multiagent Systems (cs.MA)
subject: FOS: Computer and information sciences

description: In time-sensitive and dynamic missions, multi-UAV teams must respond quickly to new information and objectives. This paper presents a dynamic decentralized task allocation algorithm for allocating new tasks that appear online during the solving of the task allocation problem. Our algorithm extends the Consensus-Based Bundle Algorithm (CBBA), a decentralized task allocation algorithm, allowing for the fast allocation of new tasks without a full reallocation of existing tasks. CBBA with Partial Replanning (CBBA-PR) enables the team to trade-off between convergence time and increased coordination by resetting a portion of their previous allocation at every round of bidding on tasks. By resetting the last tasks allocated by each agent, we are able to ensure the convergence of the team to a conflict-free solution. CBBA-PR can be further improved by reducing the team size involved in the replanning, further reducing the communication burden of the team and runtime of CBBA-PR. Finally, we validate the faster convergence and improved solution quality of CBBA-PR in multi-UAV simulations.
description: 11 pages, Accepted to AIAA GNC 2019
Evelyna longibracteata Lindley
Creators: name: Steudel, Bastian
name: Appelhans, Marc S.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Evelyna
Evelyna longibracteata

description: Evelyna longibracteata Lindley in Grisebach (1864: 623)
 Lectotype (designated here): JAMAICA. S.d., March 1204 (GOET 013926!).
 Isolectotype: JAMAICA. S.d., March 1204 (K 000463735!).
 Syntype (?): DOMINICA. S.d., Muray (?)275 (K 000463736!).
 We selected the specimen GOET 013926 as lectotype since Grisebach was based in Göttingen, and he cited this collection in the description (Grisebach 1864:623; ‘Hab. Jamaica!, Macf., March: …’). The possible syntype (K 000463736) is mentioned here as Grisebach listed Dominica as additional habitat in the protologue (Grisebach 1864: 623). The specimen was included in the Herbarium Hookerianum in 1867 (see specimen K 000463736), and hence it was probably collected before Grisebach described the species.
description: Published as part of Steudel, Bastian & Appelhans, Marc S., 2016, Newly discovered orchid types (Orchidaceae) in the Herbarium Gottingense with selected lectotypifications, pp. 235-246 in Phytotaxa 243 (3) on page 236, DOI: 10.11646/phytotaxa.243.3.2, http://zenodo.org/record/13679995
Hydrostatic pressure response of an oxide two-dimensional electron system
Creators: name: Zabaleta, J.
name: Borisov, V. S.
name: Wanke, R.
name: Jeschke, H. O.
name: Parks, S. C.
name: Baum, B.
name: Teker, A.
name: Harada, T.
name: Syassen, K.
name: Kopp, T.
name: Pavlenko, N.
name: Valentí, R.
name: Mannhart, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Two-dimensional electron systems with fascinating properties exist in multilayers of standard semiconductors, on helium surfaces, and in oxides. Compared to the two-dimensional (2D) electron gases of semiconductors, the 2D electron systems in oxides are typically more strongly correlated and more sensitive to the microscopic structure of the hosting lattice. This sensitivity suggests that the oxide 2D systems are highly tunable by hydrostatic pressure. Here we explore the effects of hydrostatic pressure on the well-characterized 2D electron system formed at LaAlO$_{3}$ -SrTiO$_{3}$ interfaces[1] and measure a pronounced, unexpected response. Pressure of $\sim$2 GPa reversibly doubles the 2D carrier density $n_{s}$ at 4 K. Along with the increase of $n_{s}$, the conductivity and mobility are reduced under pressure. First-principles pressure simulations reveal the same behavior of the carrier density and suggest a possible mechanism of the mobility reduction, based on the dielectric properties of both materials and their variation under external pressure.
description: 13 pages and 10 figures main text. 6 pages and 10 figures supplementary information. Phys Rev B (in press)
The optimum conditions of laser field depletion in laser-electron beam collision
Creators: name: Ong, J. F.
name: Moritaka, T.
name: Takabe, H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The laser field depletion in laser-electron beam collision is generally small. However, a properly chosen parameter of the laser and electron, the laser field depletion can be optimized. To access the laser energy evolution, simulations of laser-electron beam collision by Particle-in-Cell (PIC) simulation is performed. In this paper, the laser and electron parameters are chosen such that the ponderomotive force is compensated by the radiation reaction force in the head-on collision configuration. Then, the relativistic electron beam can quiver in the laser pulse for a longer time to increase the energies conversion. The optimum of laser field energy depletion is observed at $γ_0= a_0 \sim 400$ and limited beyond this point due to the impenetrability threshold. The total energy conversion from laser and electron beam into radiation emission is optimum at $γ_0= a_0 \sim 250$. This conversion efficiency can be up to several percent for an electron bunch with charges of a few nC. This efficient gamma-ray sources may provide some useful application in photonuclear experiments.
description: 6 pages, 2 figures, 1 tabel
Nonlinear Negative Refraction by Difference Frequency Generation
Creators: name: Cao, Jianjun
name: Shen, Dongyi
name: Feng, Yaming
name: Wan, Wenjie
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Negative refraction has attracted much interest for its promising capability in imaging applications. Such an effect can be implemented by negative index meta-materials, however, which are usually accompanied by high loss and demanding fabrication processes. Recently, alternative nonlinear approaches like phase conjugation and four wave mixing have shown advantages of low-loss and easy-to-implement, but associated problems like narrow accepting angles can still halt their practical applications. Here we demonstrate theoretically and experimentally a new scheme to realize negative refraction by nonlinear difference frequency generation with wide tunability, where a thin BBO slice serves as a negative refraction layer bending the input signal beam to the idler beam at a negative angle. Furthermore, we realize optical focusing effect using such nonlinear negative refraction, which may enable many potential applications in imaging science.
A surjection theorem for maps with singular perturbation and loss of derivatives
Creators: name: Ekeland, Ivar
name: Séré, Eric
Publisher: name: arXiv
Year: 2018
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper we introduce a new algorithm for solving perturbed nonlinear functional equations which admit a right-invertible linearization, but with an inverse that loses derivatives and may blow up when the perturbation parameter $ε$ goes to zero. These equations are of the form $F_ε(u)=v$ with $F_ε(0)=0$, $v$ small and given, $u$ small and unknown. The main difference with the by now classical Nash-Moser algorithm is that, instead of using a regularized Newton scheme, we solve a sequence of Galerkin problems thanks to a topological argument. As a consequence, in our estimates there are no quadratic terms. For problems without perturbation parameter, our results require weaker regularity assumptions on $F$ and $v$ than earlier ones, such as those of Hormander. For singularly perturbed functionals, we allow $v$ to be larger than in previous works. To illustrate this, we apply our method to a nonlinear Schrodinger Cauchy problem with concentrated initial data studied by Texier-Zumbrun, and we show that our result improves significantly on theirs.
description: Journal of the European Mathematical Society, European Mathematical Society, In press
Fitting Prediction Rule Ensembles to Psychological Research Data: An Introduction and Tutorial
Creators: name: Fokkema, Marjolein
name: Strobl, Carolin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Prediction rule ensembles (PREs) are a relatively new statistical learning method, which aim to strike a balance between predictive accuracy and interpretability. Starting from a decision tree ensemble, like a boosted tree ensemble or a random forest, PREs retain a small subset of tree nodes in the final predictive model. These nodes can be written as simple rules of the form if [condition] then [prediction]. As a result, PREs are often much less complex than full decision tree ensembles, while they have been found to provide similar predictive accuracy in many situations. The current paper introduces the methodology and shows how PREs can be fitted using the R package pre through several real-data examples from psychological research. The examples also illustrate a number of features of package \textbf{pre} that may be particularly useful for applications in psychology: support for categorical, multivariate and count responses, application of (non-)negativity constraints, inclusion of confirmatory rules and standardized variable importance measures.
description: Published in Psychological Methods. Supplementary materials available on https://github.com/marjoleinF/met0000256/
Temporal evolution in synthetic handwriting
Creators: name: Carmona-Duarte, Cristina
name: Ferrer, Miguel A.
name: Parziale, Antonio
name: Marcelli, Angelo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: New methods for generating synthetic handwriting images for biometric applications have recently been developed. The temporal evolution of handwriting from childhood to adulthood is usually left unexplored in these works. This paper proposes a novel methodology for including temporal evolution in a handwriting synthesizer by means of simplifying the text trajectory plan and handwriting dynamics. This is achieved through a tailored version of the kinematic theory of rapid human movements and the neuromotor inspired handwriting synthesizer. The realism of the proposed method has been evaluated by comparing the temporal evolution of real and synthetic samples both quantitatively and subjectively. The quantitative test is based on a visual perception algorithm that compares the letter variability and the number of strokes in the real and synthetic handwriting produced at different ages. In the subjective test, 30 people are asked to evaluate the perceived realism of the evolution of the synthetic handwriting.
description: Published in Pattern Recognition
Liparis vexillifera var. latifolia Cogniaux 1893
Creators: name: Steudel, Bastian
name: Appelhans, Marc S.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Liparis
Liparis vexillifera
Liparis vexillifera var. latifolia cogniaux (1893: 290)

description: Liparis vexillifera var. latifolia Cogniaux (1893: 290)
 Lectotype (designated here): ARGENTINA. Sierra de Tucuman: Cuesta del Garabatal, January 1874, Lorentz & Hieronymus 876 (BR 0000013702007!).
 Isolectotypes: ARGENTINA. Sierra de Tucuman: Cuesta del Garabatal, January 1874, Lorentz & Hieronymus no. 876 (GOET 008576!, NY 00004197).
 Syntype: ARGENTINA. Yacone: March 1873, Lorentz & Hieronymus 306 (302) (GOET 013960!).
 We selected BR 0000013702007 as lectotype since it is from the main collection of Cogniaux. The collection Lorentz & Hieronymus 876 is better represented in herbaria (BR, GOET, NY) than 306 (only GOET) and hence is a suitable lectotype. Additionally, the specimen GOET 013960 contains only one plant with only a few flowers.
description: Published as part of Steudel, Bastian & Appelhans, Marc S., 2016, Newly discovered orchid types (Orchidaceae) in the Herbarium Gottingense with selected lectotypifications, pp. 235-246 in Phytotaxa 243 (3) on pages 236-237, DOI: 10.11646/phytotaxa.243.3.2, http://zenodo.org/record/13679995