cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hyperbolic compartmental models for epidemic spread on networks with uncertain data: application to the emergence of Covid-19 in Italy
Creators: name: Bertaglia, Giulia
name: Pareschi, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Numerical Analysis (math.NA)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The importance of spatial networks in the spread of an epidemic is an essential aspect in modeling the dynamics of an infectious disease. Additionally, any realistic data-driven model must take into account the large uncertainty in the values reported by official sources, such as the amount of infectious individuals. In this paper we address the above aspects through a hyperbolic compartmental model on networks, in which nodes identify locations of interest, such as cities or regions, and arcs represent the ensemble of main mobility paths. The model describes the spatial movement and interactions of a population partitioned, from an epidemiological point of view, on the basis of an extended compartmental structure and divided into commuters, moving on a suburban scale, and non-commuters, acting on an urban scale. Through a diffusive rescaling, the model allows us to recover classical diffusion equations related to commuting dynamics. The numerical solution of the resulting multiscale hyperbolic system with uncertainty is then tackled using a stochastic collocation approach in combination with a finite-volume IMEX method. The ability of the model to correctly describe the spatial heterogeneity underlying the spread of an epidemic in a realistic city network is confirmed with a study of the outbreak of COVID-19 in Italy and its spread in the Lombardy Region.
Supplemental Feeding of Honey Bee Colonies
Creators: name: Standifer, L. N.
name: Moeller, F. E.,
name: Kauffeld, N. M.,
name: Herbert, E. W., Jr.,
name: Shimanuki, H.
name: Standifer, L. N.
name: Moeller, F. E.,
name: Kauffeld, N. M.,
name: Herbert, E. W., Jr.,
name: Shimanuki, H.
Publisher: name: Unknown
Year: 1978
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Livestock Production/Industries
subject: Honey bee (Apis mellifera)
subject: bees
subject: food requirements
subject: supplementary feeding
subject: nutrition
subject: protein supplements
subject: pollen supplements
subject: pollen substitutes
subject: brood rearing

description: This publication discusses the general food requirements of honey bees, Apis mellifera L., and presents formulas for supplementary diets and methods for feeding such foods to bee colonies. In early spring, before pollen and nectar are available or at other times of the year when these materials are not available for bees in the field or in the hive, supplementary feeding may help the colony survive or sustain brood rearing and colony development. None of the protein supplemental foods fed to honey bees is a complete replacement for natural pollen; however, several brewer's yeast products, Wheast, and soybean flour, fed singly or in combination, can be used to improve the nutrition of colonies when natural pollen is scarce. Cane or beet sugar and isomerized corn sirup can be used to supplement the bees' diet of nectar or honey.
Imaging of Thermal Domains in ultrathin NbN films for Hot Electron Bolometers
Creators: name: Doenitz, D.
name: Kleiner, R.
name: Koelle, D.
name: Scherer, T.
name: Schuster, K. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present low-temperature scanning electron microscopy (LTSEM) investigations of superconducting microbridges made from ultrathin NbN films as used for hot electron bolometers. LTSEM probes the thermal structure within the microbridges under various dc current bias conditions, either via electron-beam-induced generation of an unstable hotspot, or via the beam-induced growth of a stable hotspot. Such measurements reveal inhomogeneities on a micron scale, which may be due to spatial variations in the NbN film or film-interface properties. Comparison with model calculations for the stable hotspot regime confirm the basic features of common hot spot models.
description: 3 pages, 3 figures
RMS Radio Source Contributions to the Microwave Sky
Creators: name: Boughn, S. P.
name: Partridge, R. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Cross-correlations of the WMAP full sky K, Ka, Q, V, and W band maps with the 1.4 GHz NVSS source count map and the HEAO I A2 2-10 keV full sky X-ray flux map are used to constrain rms fluctuations due to unresolved microwave sources in the WMAP frequency range. In the Q band (40.7 GHz), a lower limit, taking account of only those fluctuations correlated with the 1.4 GHz radio source counts and X-ray flux, corresponds to an rms Rayleigh-Jeans temperature of ~ 2 microKelvin for a solid angle of one square degree. The correlated fluctuations at the other bands are consistent with a beta = -2.1 +- 0.4 frequency spectrum. Using the rms fluctuations of the X-ray flux and radio source counts, and the cross-correlation of these two quantities as a guide, the above lower limit leads to a plausible estimate of ~ 5 microKelvin for Q-band rms fluctuations in one square degree. This value is similar to that implied by the excess, small angular scale fluctuations observed in the Q band by WMAP, and is consistent with estimates made by extrapolating low-frquency source counts.
description: 17 pages, 8 figures, submitted to ApJ
Development of recommendation systems for software engineering: the CROSSMINER experience
Creators: name: Di Rocco, Juri
name: Di Ruscio, Davide
name: Di Sipio, Claudio
name: Nguyen, Phuong T.
name: Rubei, Riccardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2.3; D.2.13; K.6.3

description: To perform their daily tasks, developers intensively make use of existing resources by consulting open-source software (OSS) repositories. Such platforms contain rich data sources, e.g., code snippets, documentation, and user discussions, that can be useful for supporting development activities. Over the last decades, several techniques and tools have been promoted to provide developers with innovative features, aiming to bring in improvements in terms of development effort, cost savings, and productivity. In the context of the EU H2020 CROSSMINER project, a set of recommendation systems has been conceived to assist software programmers in different phases of the development process. The systems provide developers with various artifacts, such as third-party libraries, documentation about how to use the APIs being adopted, or relevant API function calls. To develop such recommendations, various technical choices have been made to overcome issues related to several aspects including the lack of baselines, limited data availability, decisions about the performance measures, and evaluation approaches. This paper is an experience report to present the knowledge pertinent to the set of recommendation systems developed through the CROSSMINER project. We explain in detail the challenges we had to deal with, together with the related lessons learned when developing and evaluating these systems. Our aim is to provide the research community with concrete takeaway messages that are expected to be useful for those who want to develop or customize their own recommendation systems. The reported experiences can facilitate interesting discussions and research work, which in the end contribute to the advancement of recommendation systems applied to solve different issues in Software Engineering.
description: 43 pages; 8 figures; Accepted for publication at the Empirical Software Engineering Journal
A note on acquisition of complements in a vertically differentiated market
Creators: name: Tarola, Ornella
name: Vergari, Cecilia
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/02 Politica economica

description: This note is concerned with the effects of joint ownership of complements when they are vertically differentiated. We provide strong arguments for the positive nature of network integration among firms, while showing at the same time that, in some circumstances, anti-competitive consequences can be observed under acquisition.
A bibliometric analysis of citation diversity in accessibility and HCI research
Creators: name: Wang, Lucy Lu
name: Mack, Kelly
name: McDonnell, Emma
name: Jain, Dhruv
name: Findlater, Leah
name: Froehlich, Jon E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Accessibility research sits at the junction of several disciplines, drawing influence from HCI, disability studies, psychology, education, and more. To characterize the influences and extensions of accessibility research, we undertake a study of citation trends for accessibility and related HCI communities. We assess the diversity of venues and fields of study represented among the referenced and citing papers of 836 accessibility research papers from ASSETS and CHI, finding that though publications in computer science dominate these citation relationships, the relative proportion of citations from papers on psychology and medicine has grown over time. Though ASSETS is a more niche venue than CHI in terms of citational diversity, both conferences display standard levels of diversity among their incoming and outgoing citations when analyzed in the context of 53K papers from 13 accessibility and HCI conference venues.
description: 11 pages, 5 figures, 3 tables, 2 appendices; CHI LBW 2021; accessible PDF available at https://makeabilitylab.cs.washington.edu/
Plants Poisonous to Livestock in the Western States
Creators: name: Panter, K. E.
name: Et Al. [+9]
name: Panter, K. E.
name: Et Al. [+9]
Publisher: name: Unknown
Year: 2011
Subjects: subject: Livestock Production/Industries
subject: Production Economics
subject: abortion
subject: arrowgrass
subject: birth defects
subject: bitterweed
subject: bracken fern
subject: chokecherry
subject: copperweed
subject: death camas
subject: emaciation
subject: false hellebore
subject: greasewood
subject: groundsel
subject: halogeton
subject: hemp dogbane
subject: horsebrush
subject: kochia
subject: larkspur
subject: locoweed
subject: lupine
subject: milkvetch
subject: milkweed
subject: nightshade
subject: nitrate
subject: oak
subject: photosensitization
subject: pingue
subject: poison hemlock
subject: poisonous plants
subject: ponderosa pine
subject: rayless goldenrod
subject: rubberweed
subject: Russian knapweed
subject: selenium
subject: snakeweed, sneezeweed
subject: spring parsley
subject: St. Johnswort
subject: Sweet clover
subject: tansy ragwort
subject: veratrum
subject: waterhemlock
subject: yellow star thistle
subject: yew

description: Poisonous plants are a major cause of economic loss to the Livestock industry. Each year these plants adversely affect 3 to 5 percent of the cattle, sheep, and horses that graze western ranges. These losses result from death of livestock, abortions, photosensitization, decreased production, emaciation, and birth defects. In addition to these losses are those of increased management costs associated with such things as fencing, altered grazing programs, and loss of forage. This bulletin describes more than 30 of the principal poisonous plants growing on western ranges and the signs of poisoning in livestock. Suggestions are included for the prevention of livestock poisoning by plants.
Matrix extension of multidimensional dispersionless integrable hierarchies
Creators: name: Bogdanov, L. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37K10, 37K15, 37K25, 35Q75

description: We consistently develop a recently proposed scheme of matrix extension of dispersionless integrable systems for the general case of multidimensional hierarchies, concentrating on the case of dimension $d\geqslant 4$. We present extended Lax pairs, Lax-Sato equations, matrix equations on the background of vector fields and the dressing scheme. Reductions, construction of solutions and connections to geometry are discussed. We consider separately a case of Abelian extension, for which the Riemann-Hilbert equations of the dressing scheme are explicitly solvable and give an analogue of Penrose formula in the curved space.
description: 14 pages, to be published in Teor. i Mat. Fiz. (a Russian version)
Testing and estimation of clustered signals
Creators: name: Cao, Hongyuan
name: Wu, Wei Biao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We propose a change-point detection method for large scale multiple testing problems with data having clustered signals. Unlike the classic change-point setup, the signals can vary in size within a cluster. The clustering structure on the signals enables us to effectively delineate the boundaries between signal and non-signal segments. New test statistics are proposed for observations from one and/or multiple realizations. Their asymptotic distributions are derived. We also study the associated variance estimation problem. We allow the variances to be heteroscedastic in the multiple realization case, which substantially expands the applicability of the proposed method. Simulation studies demonstrate that the proposed approach has a favorable performance. Our procedure is applied to {an array based Comparative Genomic Hybridization (aCGH)} dataset.
NNLO QCD predictions of the electron charge asymmetry for the inclusive $pp \rightarrow W+X$ production in the forward region at 13 TeV and 14 TeV
Creators: name: Ocalan, Kadir
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper presents perturbative QCD predictions of the electron charge asymmetry for the inclusive $W^{\pm}+X \rightarrow e^{\pm} ν+X$ production in proton-proton (pp) collisions. Perturbative QCD calculations are performed at next-to-next-to-leading order (NNLO) accuracy by using different parton distribution function (PDF) models at 8 TeV, 13 TeV, and 14 TeV center-of-mass energies of the CERN LHC pp collisions. The NNLO calculations are performed for the electrons to have transverse momentum more than 20 GeV in the forward electron pseudorapidity region $2.0 \leq η_{e} \leq 4.25$. The NNLO predictions are first compared at 8 TeV with the measurement of the LHCb experiment at the LHC for the W$^{+}$/W$^{-}$ cross section ratio and charge asymmetry distributions. The 8 TeV predictions using NNPDF3.1, CT14, and MMHT2014 PDF sets are reported to be in good agreement with the LHCb data for the entire $η_{e}$ region justifying the extension of the calculations to 13 TeV and 14 TeV energies. The charge asymmetry predictions at NNLO accuracy are also reported in the forward $η_{e}$ bins at 13 TeV and 14 TeV and compared among NNPDF3.1, CT14, and MMHT2014 PDF sets. Overall the predicted W$^{\pm}$ differential cross section and charge asymmetry distributions based on different PDF sets are found to be consistent with each other for the entire $η_{e}$ region. The charge asymmetry distributions are shown to be more sensitive to discriminate among different PDF models in the 14 TeV predictions.
description: 9 pages, 5 figures, 4 tables
title: Closing the loop: establishing an autonomous test-learn cycle to optimize induction of bacterial systems using a robotic platform
Creators: name: Spannenkrebs, Jan Benedict
name: Eiermann, Aron
name: Zoll, Thomas
name: Hackenschmidt, Silke
name: Kabisch, Johannes
Publisher: name: Frontiers Media S.A.
Year: 2025

description: One goal of synthetic biology is to provide well-characterised biological parts that behave predictably in genetic assemblies. To achieve this, each part must be characterised in a time-resolved manner under relevant conditions. Robotic platforms can be used to automate this task and provide sufficiently large and reproducible data sets including provenance. Although robotics can significantly speed up the data collection process, the collation and analysis of the resulting data, needed to reprogram and refine workflows for future iterations, is often a manual process. As a result, even in times of rapidly advancing artificial intelligence, the common design-build-test-learn (DBTL) cycle is still not circular without human intervention. To move towards fully automated DBTL cycles, we developed a software framework to enable a robotic platform to autonomously adjust test parameters. This interdisciplinary work between computer science and biology thus transforms a static robotic platform into a dynamic one. The software framework includes software components such as an importer that retrieves measurement data from the platform’s devices and writes it to a database. This is followed by an optimizer that selects the next measurement points based on a balance between exploration and exploitation. The platform is shown to be able to automatically and autonomously optimize the inducer concentration for a Bacillus subtilis system and the combination of inducer and feed release for a Escherichia coli system. As a target product the readily measurable green fluorescent reporter protein (GFP) is produced over multiple, consecutive iterations of testing. An evaluation of chosen (learning) algorithms for single and dual factor optimization was performed. In this article, we share the lessons learned from the development, implementation and execution of this automated design-build-test-learn cycles on a robotic platform.
A Theoretical Model of the Near Surface Shear Layer of the Sun
Creators: name: Jha, Bibhuti Kumar
name: Choudhuri, Arnab Rai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Sun has a Near-Surface Shear Layer (NSSL), within which the angular velocity decreases rapidly with radius. We provide an explanation of this layer based on the thermal wind balance equation. Since convective motions are not affected by solar rotation in the top layer of the convection zone, we argue that the temperature falls at the same rate at all latitudes in this layer. This makes the thermal wind term very large in this layer and the centrifugal term has also to become very large to balance it, giving rise to the NSSL. From the values of differential rotation $Ω(rr_c, θ)$ there from $ΔT (r, θ)$. We carry on this exercise using both an analytical expression of the differential rotation and the actual data provided by helioseismology. We find that our theoretical results of the NSSL match the observational data reasonably well for $r_c \approx 0.96~{\rm R_{\odot}}$, giving an estimate of the radius till which the convective motions are affected by the solar rotation.
description: 11 pages, 12 figures, under review in MNRAS
The Big Brother NaijaTV Reality Show as Coordinate of Media Functions and Dysfunctions
Creators: name: Folayan, Bolu John
name: Ajibade, Olubunmi
name: Dipo-Adedoyin, Olubunmi
name: Onayinka, Toyin Segun
name: Folayan, Toluwani Titilola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: The mass media play at least five basic functions which include news dissemination, surveillance of the environment, correlation of the components of the society, entertainment and transmission of social heritage. Sometimes, disruptions and impairments do occur in the performance of these roles and some of these basic functions become dysfunctions, which turn the media into purveyor of negative values. The present study investigates how popular the Nigerian TV reality show, Big Brother Naija BBN, is perceived by its viewers. Three hundred heavy viewers of the program were surveyed from Lagos and Ede, South-West Nigeria, and their opinions and attitudes were sought regarding, why they like or dislike the program; the gratifications that those who like the program derive and whether the BBN, as media content, is generally functional or dysfunctional to the society. Sixty six per cent 66 33.7 of respondents like the program because it entertains. Half of the respondents, 99 50.5 dislike immoral aspects of the program. The viewers affirm that the eviction part of the program was their highest form of gratification. Most respondents, despite public outcry against the program, consider the program to be functional. Findings reinforce the postulation that TV viewers are not passive consumers of media contents.
When verbs come (and) clash together: the diachrony of multiverb constructions in Juǀ'hoan and ǃXun
Creators: name: Pratchett, Lee J.
Publisher: name: Zenodo
Year: 2021
Subjects: Morphosyntax
Serial verb construction
Multiverb construction
Coordination
Khoisan
Ju

description: This is a handout of a guest presentation made to the research colloquium on African languages and linguistics at the Institute for Asian and African Studies, Humboldt-Universität zu Berlin, on November 16 2021. Abstract Verb serialising constructions are an areal feature of the Kalahari Basin Area (e.g., Güldemann & Fehn 2017), a Sprachbund comprising the Kx’a, Tuu, and Khoe-Kwadi language families. This presentation revisits the analysis of serial verbs in Juǀ’hoan and ǃXun (Ju, Kx’a) and focuses on formal variation observed in the analyses of asymmetric serial verbs (e.g., Heine & König 2015, Pratchett 2017). Applying a bottom-up approach and sourcing data as far as possible from natural texts, such variation can be shown to have its origins in a non-serialising multiverb construction involving a linker. The presentation concludes by illustrating the potential relevance of the Ju construction to the analysis of multiverb constructions in other Kalahari Basin Area languages. References
 Güldemann, Tom and Anne-Maria Fehn. 2017. The Kalahari Basin area as a “Sprachbund” before the Bantu expansion. In Hickey, Raymond (ed.), The Cambridge handbook of areal linguistics, 500-526. Cambridge: Cambridge University Press.

 Heine, Bernd & Christa König. 2015. The !Xun language: a dialect grammar of Northern Khoisan: Cologne: Köppe.

 Pratchett, Lee J. 2017. Dialectal diversity in Southeastern Ju (Kx'a) and a documentation of Groot Laagte ǂKx’aoǁ’ae. Doctoral dissertation. Berlin: Humboldt-Universität zu Berlin.
description: Numerous typos removed in Version 2
Fewer, Larger U.S. Farms by Year 2000--and Some Consequences
Creators: name: McDonald, Thomas
name: Coffman, George
name: McDonald, Thomas
name: Coffman, George
Publisher: name: Unknown
Year: 1980
Subjects: subject: Farm Management
subject: Land Economics/Use
subject: Research and Development/Tech Change/Emerging Technologies
subject: Projections
subject: farm numbers
subject: farm corporations
subject: farm technology
subject: farmland
subject: entry barriers

description: The number of U.S. farms will likely decline by about a third in the next 20 years, if present trends continue, while the number of large farms (annual sales more than $100,000) will quadruple. Family farms will continue to dominate, but the influence of small farms will wane. More large farms will probably mean more farm corporations, more specialization in what farms produce, agricultural production concentrated among relatively few farms, and fewer young people getting started in farming because of the high capital requirements.
UnDiFi-2D: an Unstructured Discontinuity Fitting code for 2D grids
Creators: name: Campoli, L.
name: Assonitis, A.
name: Ciallella, M.
name: Paciorri, R.
name: Bonfiglioli, A.
name: Ricchiuto, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: UnDiFi-2D, an open source (free software) Unstructured-grid, Discontinuity Fitting code, is presented. The aim of UnDiFi-2D is to model gas-dynamic discontinuities in two-dimensional (2D) flows as if they were true discontinuities of null thickness that bound regions of the flow-field where a smooth solution to the governing PDEs exists. UnDiFi-2D therefore needs to be coupled with an unstructured CFD solver that is used to discretize the governing PDEs within the smooth regions of the flow-field. Two different, in-house developed, CFD solvers are also included in the current distribution. The main features of the UnDiFi-2D software can be summarized as follows: Programming Language: UnDiFi-2D is written in standard Fortran 77/95; its design is highly modular in order to enhance simplicity of use, maintenance and allow coupling with virtually any existing CFD solver; Usability, Maintenance and Enhancement: In order to improve the usability, maintenance and enhancement of the code also the documentation has been carefully taken into account. The git distributed versioning system has been adopted to facilitate collaborative maintenance and code development; Copyrights: UnDiFi-2D is a free software that anyone can use, copy, distribute, change and improve under the GNU Public License version 3. The present paper is a manifesto of the first public release of the UnDiFi-2D code. It describes the currently implemented features, which are the result of more than a decade of still ongoing CFD developments. This work is focused on the computational techniques adopted and a detailed description of the main characteristics is reported. UnDiFi-2D capabilities are demonstrated by means of examples test cases. The design of the code allows to easily include existing CFD codes and is aimed at ease code reuse and readability.
description: Keywords: CFD, Fortran, C, shock-fitting, shock-capturing,, unstructured grids
Tool Support for Systematic Literature Reviews - Evidence Briefing of the Rapid Review Results
Creators: name: Karakan, Burak
Publisher: name: Zenodo
Year: 2021

description: This Evidence Briefing reports the main findings of the Rapid Review. Tool support or specific tools for systematic literature studies. Tools that can support at least one stage of the SLR/MS process. Underlying approaches of the tools and the most important features.
Structural distortions and model Hamiltonian parameters: from LSDA to a tight-binding description of LaMnO_3
Creators: name: Ederer, Claude
name: Lin, Chungwei
name: Millis, Andrew J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The physics of manganites is often described within an effective two-band tight-binding (TB) model for the Mn e_g electrons, which apart from the kinetic energy includes also a local "Hund's rule" coupling to the t_{2g} core spin and a local coupling to the Jahn-Teller (JT) distortion of the oxygen octahedra. We test the validity of this model by comparing the energy dispersion calculated for the TB model with the full Kohn-Sham band-structure calculated within the local spin-density approximation (LSDA) to density functional theory. We analyze the effect of magnetic order, JT distortions, and "GdFeO_3-type" tilt-rotations of the oxygen octahedra. We show that the hopping amplitudes are independent of magnetic order and JT distortions, and that both effects can be described with a consistent set of model parameters if hopping between both nearest and next-nearest neighbors is taken into account. We determine a full set of model parameters from the density functional theory calculations, and we show that both JT distortions and Hund's rule coupling are required to obtain an insulating ground state within LSDA. Furthermore, our calculations show that the "GdFeO_3-type" rotations of the oxygen octahedra lead to a substantial reduction of the hopping amplitudes but to no significant deviation from the simple TB model.
description: replaced with final (published) version with improved presentation
Plasma Modes Along the Open Field Lines of a Neutron Star
Creators: name: Mofiz, U. A.
name: Ahmedov, B. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider electrostatic plasma modes along the open field lines of a rotating neutron star. Goldreich-Julian charge density in general relativity is analyzed for the neutron star with zero inclination. It is found that the charge density is maximum at the polar cap and it remains almost same in certain extended region of the pole. For a steady state Goldreich-Julian charge density we found the usual plasma oscillation along the field lines; plasma frequency resembles to the gravitational redshift close to the Schwarzschild radius. We study the nonlinear plasma mode along the field lines. From the system of equations under general relativity, a second order differential equation is derived. The equation contains a term which describes the growing plasma modes near Schwarzschild radius in a black hole environment. The term vanishes with the distance far away from the gravitating object. For initially zero potential and field on the surface of a neutron star, Goldreich-Julian charge density is found to create the plasma mode, which is enhanced and propagates almost without damping along the open field lines. We briefly outline our plan to extend the work for studying soliton propagation along the open field lines of strongly gravitating objects.
Tully-Fisher Distances and Dynamical Mass Constraints for 24 Host Galaxies of Reverberation-Mapped AGN
Creators: name: Robinson, Justin H.
name: Bentz, Misty C.
name: Courtois, Hélène M.
name: Johnson, Megan C.
name: Crenshaw, D. M.
name: Meena, Beena
name: Polack, Garrett E.
name: Silverstein, Michele L.
name: Chen, Dading
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Tully-Fisher distances for 24 AGN host galaxies with black hole mass ($M_\textrm{BH}$) measurements from reverberation mapping, as well as the first calibration of the $V-$band Tully-Fisher relation. Combining our measurements of HI 21cm emission with $HST$ and ground-based optical and near-infrared images allows multiple distance measurements for 19 galaxies and single measurements for the remaining 5. Separation of the nucleus from its host galaxy via surface brightness decomposition yields galaxy-only luminosities, thus allowing measurements of the distance moduli free of contamination from the AGN. For 14 AGN hosts, these are the first reported distances independent of redshift, and hence independent of peculiar velocities. For the remaining galaxies, we show good agreement between our distances and those previously reported from surface brightness fluctuations (SBF) and Cepheids. We also determine the total galaxy mass enclosed within the estimated HI radius, which when compared to the baryonic content allows for constraints on the dark matter masses. We find a typical mass fraction of $M_{\textrm{DM}}$/$M_{\textrm{DYN}}$ = 62\%, and find significant correlations between $M_{\textrm{BH}}$ $-$ $M_{\textrm{DYN}}$ and $M_{\textrm{BH}}$ $-$ $M_{\textrm{DM}}$. Finally, we scale our galaxy radii based on estimated relationships between visible and halo radii and assume a flat rotation curve out to the halo radius to approximate $M_{\textrm{HALO}}$. Over the range of $M_{\textrm{BH}}$ and $M_{\textrm{HALO}}$ in this sample, we find good agreement with observationally-constrained relationships between $M_{\textrm{BH}}$ and $M_{\textrm{HALO}}$ and with hydrodynamical simulations.
description: Accepted for publication in ApJ. 24 pages, 15 figures
Riemann zeta function and quantum chaos
Creators: name: Bogomolny, Eugene
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: A brief review of recent developments in the theory of the Riemann zeta function inspired by ideas and methods of quantum chaos is given.
description: Lecture given at International Conference on Quantum Mechanics and Chaos, Osaka, September 2006
Holography in Three-dimensional Kerr-de Sitter Space with a Gravitational Chern-Simons Term
Creators: name: Park, Mu-in
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The holographic description of the three-dimensional Kerr-de Sitter space with a gravitational Chern-Simons term is studied, in the context of dS/CFT correspondence. The space has only one (cosmological) event horizon and its mass and angular momentum are identified from the holographic energy-momentum tensor at the asymptotic infinity. The thermodynamic entropy of the cosmological horizon is computed directly from the first law of thermodynamics, with the usual Hawking temperature, and it is found that the usual Gibbons-Hawking entropy is modified. It is remarked that, due to the gravitational Chern-Simons term, (a) the results go beyond analytic continuation from AdS, (b) the maximum-mass/N-bound conjecture may be violated, and (c) the three-dimensional cosmology is chiral. A statistical mechanical computation of the entropy, from a Cardy-like formula for a dual CFT at the asymptotic boundary, is discussed. Some technical difference in the Chern-Simons energy-momentum tensor, from literatures is remarked also.
description: Typos corrected; Accepted in CQG
The First Direct Distance and Luminosity Determination for a Self-Luminous Giant Exoplanet: The Trigonometric Parallax to 2MASS1207334-393254Ab
Creators: name: Biller, Beth
name: Close, Laird
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first trigonometric parallax and distance for a young planetary mass object. A likely TW Hya cluster member, 2MASSW J1207334-393254Ab (hereafter 2M1207Ab) is an M8 brown dwarf with a mid to late L type planetary mass companion. Recent observations of spectral variability have uncovered clear signs of disk accretion and outflow, constraining the age of the system to <10 Myr. Because of its late spectral type and the clearly youthful nature of the system, 2M1207b is very likely a planetary mass object. We have measured the first accurate distance and luminosity for a self-luminous planetary mass object. Our parallax measurements are accurate to <2 mas (1sigma) for 2M1207Ab. With 11 total epochs of data taken from January 2006 through April 2 007 (475 images for 2M1207Ab), we determine a distance of 58.8+-7.0 pc (17.0{+2.3}{-1.8} mas, 1.28sigma) to 2M1207Ab and a calculated luminosity of 0.68-2.2x10^-5 Lsun for 2M1207b. Hence 2M1207Ab is a clear member of the TW Hya cluster in terms of its distance, proper motions, and youthful nature. However, as previously noted by Mohanty and co-workers, 2M1207b's luminosity appears low compared to its temperature according to evolutionary models.
description: 12 pages, 3 figures, accepted to ApJ Letters
On the Emergence of Whole-body Strategies from Humanoid Robot Push-recovery Learning
Creators: name: Ferigo, Diego
name: Camoriano, Raffaello
name: Viceconte, Paolo Maria
name: Calandriello, Daniele
name: Traversaro, Silvio
name: Rosasco, Lorenzo
name: Pucci, Daniele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Balancing and push-recovery are essential capabilities enabling humanoid robots to solve complex locomotion tasks. In this context, classical control systems tend to be based on simplified physical models and hard-coded strategies. Although successful in specific scenarios, this approach requires demanding tuning of parameters and switching logic between specifically-designed controllers for handling more general perturbations. We apply model-free Deep Reinforcement Learning for training a general and robust humanoid push-recovery policy in a simulation environment. Our method targets high-dimensional whole-body humanoid control and is validated on the iCub humanoid. Reward components incorporating expert knowledge on humanoid control enable fast learning of several robust behaviors by the same policy, spanning the entire body. We validate our method with extensive quantitative analyses in simulation, including out-of-sample tasks which demonstrate policy robustness and generalization, both key requirements towards real-world robot deployment.
description: Co-first authors: Diego Ferigo and Raffaello Camoriano; 8 pages
An Adaptive Receiver for Underwater Acoustic Full-Duplex Communication with Joint Tracking of the Remote and Self-Interference Channels
Creators: name: Towliat, Mohammad
name: Guo, Zheng
name: Cimini, Leonard J.
name: Xia, Xiang-Gen
name: Song, Aijun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Full-duplex (FD) communication is a promising candidate to address the data rate limitations in underwater acoustic (UWA) channels. Because of transmission at the same time and on the same frequency band, the signal from the local transmitter creates self-interference (SI) that contaminates the signal from the remote transmitter. At the local receiver, channel state information for both the SI and remote channels is required to remove the SI and equalize the SI-free signal, respectively. However, because of the rapid time-variations of the UWA environment, real-time tracking of the channels is necessary. In this paper, we propose a receiver for UWA-FD communication in which the variations of the SI and remote channels are jointly tracked by using a recursive least squares (RLS) algorithm fed by feedback from the previously detected data symbols. Because of the joint channel estimation, SI cancellation is more successful compared to UWA-FD receivers with separate channel estimators. In addition, due to providing a real-time channel tracking without the need for frequent training sequences, the bandwidth efficiency is preserved in the proposed receiver.
description: 7 pages, 7 figures
When verbs come (and) clash together: the diachrony of multiverb constructions in Juǀ'hoan and ǃXun
Creators: name: Pratchett, Lee J.
Publisher: name: Zenodo
Year: 2021
Subjects: Morphosyntax
Serial verb construction
Multiverb construction
Coordination
Khoisan
Ju

description: This is a handout of a guest presentation made to the research colloquium on African languages and linguistics at the Institute for Asian and African Studies, Humboldt-Universität zu Berlin, on November 16 2021. Abstract Verb serialising constructions are an areal feature of the Kalahari Basin Area (e.g., Güldemann & Fehn 2017), a Sprachbund comprising the Kx’a, Tuu, and Khoe-Kwadi language families. This presentation revisits the analysis of serial verbs in Juǀ’hoan and ǃXun (Ju, Kx’a) and focuses on formal variation observed in the analyses of asymmetric serial verbs (e.g., Heine & König 2015, Pratchett 2017). Applying a bottom-up approach and sourcing data as far as possible from natural texts, such variation can be shown to have its origins in a non-serialising multiverb construction involving a linker. The presentation concludes by illustrating the potential relevance of the Ju construction to the analysis of multiverb constructions in other Kalahari Basin Area languages. References
 Güldemann, Tom and Anne-Maria Fehn. 2017. The Kalahari Basin area as a “Sprachbund” before the Bantu expansion. In Hickey, Raymond (ed.), The Cambridge handbook of areal linguistics, 500-526. Cambridge: Cambridge University Press.

 Heine, Bernd & Christa König. 2015. The !Xun language: a dialect grammar of Northern Khoisan: Cologne: Köppe.

 Pratchett, Lee J. 2017. Dialectal diversity in Southeastern Ju (Kx'a) and a documentation of Groot Laagte ǂKx’aoǁ’ae. Doctoral dissertation. Berlin: Humboldt-Universität zu Berlin.
Searches for Mixing and CP Violation in the D0-D0bar System
Creators: name: Schwartz, A. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We review searches for mixing and CP violation in the D0-D0bar system and discuss the first evidence for mixing recently obtained by the Belle and BABAR collaborations. We also present world average values for the mixing parameters x=Delta m/Gamma and y=Delta Gamma/(2 Gamma) as calculated by the Heavy Flavors Averaging Group.
description: 8 pages, 10 figures, 3 tables, contribution to FPCP'07, Bled, Slovenia
To a question on the η\to π^0 γγdecay width in meson-baryon chiral model
Creators: name: Kuraev, E. A.
name: Pervushin, V. N.
name: Volkov, M. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown in the work of one of the authors in 1979 (MKV) that the contribution to the amplitude of this decay from diagrams with one baryon loop is equal to zero and contributions from diagrams with meson loops appear very small. However, pole diagrams with intermediate vector mesons were not considered there. Here it is shown that contributions of these pole diagrams dominate. The meson-baryon chiral model used here is compared with known quark chiral models. The obtained results are in satisfactory agreement with recent experimental data.
description: 4 pages, 1 pic
Effects of Dust Geometry in Lyman Alpha Galaxies at z = 4.4
Creators: name: Finkelstein, Steven L.
name: Rhoads, James E.
name: Malhotra, Sangeeta
name: Grogin, Norman
name: Wang, Junxian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Equivalent widths (EWs) observed in high-redshift Lyman alpha galaxies could be stronger than the EW intrinsic to the stellar population if dust is present residing in clumps in the inter-stellar medium (ISM). In this scenario, continuum photons could be extinguished while the Lyman alpha photons would be resonantly scattered by the clumps, eventually escaping the galaxy. We investigate this radiative transfer scenario with a new sample of six Lyman alpha galaxy candidates in the GOODS CDF-S, selected at z = 4.4 with ground-based narrow-band imaging obtained at CTIO. Grism spectra from the HST PEARS survey confirm that three objects are at z = 4.4, and that another object contains an active galactic nuclei (AGN). If we assume the other five (non-AGN) objects are at z = 4.4, they have rest-frame EWs from 47 -- 190 A. We present results of stellar population studies of these objects, constraining their rest-frame UV with HST and their rest-frame optical with Spitzer. Out of the four objects which we analyzed, three objects were best-fit to contain stellar populations with ages on the order of 1 Myr and stellar masses from 3 - 10 x 10^8 solar masses, with dust in the amount of A_1200 = 0.9 - 1.8 residing in a quasi-homogeneous distribution. However, one object (with a rest EW ~ 150 A) was best fit by an 800 Myr, 6.6 x 10^9 solar mass stellar population with a smaller amount of dust (A_1200 = 0.4) attenuating the continuum only. In this object, the EW was enhanced ~ 50% due to this dust. This suggests that large EW Lyman alpha galaxies are a diverse population. Preferential extinction of the continuum in a clumpy ISM deserves further investigation as a possible cause of the overabundance of large-EW objects that have been seen in narrow-band surveys in recent years.
description: Submitted to the Astrophysical Journal. 35 pages, 7 figures and 4 tables
Using Relative Lines of Code to Guide Automated Test Generation for Python
Creators: name: Holmes, Josie
name: Ahmed, Iftekhar
name: Brindescu, Caius
name: Gopinath, Rahul
name: Zhang, He
name: Groce, Alex
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Raw lines of code (LOC) is a metric that does not, at first glance, seem extremely useful for automated test generation. It is both highly language-dependent and not extremely meaningful, semantically, within a language: one coder can produce the same effect with many fewer lines than another. However, relative LOC, between components of the same project, turns out to be a highly useful metric for automated testing. In this paper, we make use of a heuristic based on LOC counts for tested functions to dramatically improve the effectiveness of automated test generation. This approach is particularly valuable in languages where collecting code coverage data to guide testing has a very high overhead.We apply the heuristic to property-based Python testing using the TSTL (Template Scripting Testing Language) tool. In our experiments, the simple LOC heuristic can improve branch and statement coverage by large margins (often more than 20%, up to 40% or more), and improve fault detection by an even larger margin (usually more than 75%, and up to 400% or more). The LOC heuristic is also easy to combine with other approaches, and is comparable to, and possibly more effective than, two well-established approaches for guiding random testing.
A new look at the modified Coulomb potential in a strong magnetic field
Creators: name: Sadooghi, N.
name: Jalili, A. Sodeiri
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The static Coulomb potential of Quantum Electrodynamics (QED) is calculated in the presence of a strong magnetic field in the lowest Landau level (LLL) approximation using two different methods. First, the vacuum expectation value of the corresponding Wilson loop is calculated perturbatively in two different regimes of dynamical mass $m_{dyn.}$, {\it i.e.}, $|{\mathbf{q}}_{\|}^{2}|\ll m_{dyn.}^{2}\ll |eB|$ and $m_{dyn.}^{2}\ll |\mathbf{q}_{\|}^{2}|\ll|eB|$, where $\mathbf{q}_{\|}$ is the longitudinal components of the momentum relative to the external magnetic field $B$. The result is then compared with the static potential arising from Born approximation. Both results coincide. Although the arising potentials show different behavior in the aforementioned regimes, a novel dependence on the angle $θ$ between the particle-antiparticle's axis and the direction of the magnetic field is observed. In the regime $|{\mathbf{q}}_{\|}^{2}|\ll m_{dyn.}^{2}\ll |eB|$, for strong enough magnetic field and depending on the angle $θ$, a qualitative change occurs in the Coulomb-like potential; Whereas for $θ=0,π$ the potential is repulsive, it exhibits a minimum for angles $θ\in]0,π[$.
description: V1: 26 pages, 8 figures, latex format, V2: Accepted for publication in PRD (2007)
Foreign Ownership of U.S. Agriculture Land, February 1, 1979, through February 1, 1980
Creators: name: DeBraal, J. Peter
name: DeBraal, J. Peter
Publisher: name: Unknown
Year: 1980
Subjects: Agricultural and Food Policy
Farm Management
Land Economics/Use

description: Foreigners owned 5.6 million acres of U.S. agricultural land as of February 1, 1980. This is slightly less than 0.5 percent of all privately held agricultural land, and less than 0.25 percent of all land in the United States. This share is unlikely to have any aggregate impact on agriculture, either positive or negative. However, some communities could be locally affected in areas of heaviest concentration. These conclusions are based on an analysis of reports submitted in compliance with the Agricultural Foreign Investment Disclosure Act of 1978.