bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kepler-1661 b: A Neptune-sized Kepler Transiting Circumbinary Planet around a Grazing Eclipsing Binary
Authors: Socia Quentin J , Welsh William F , Orosz Jerome A , Cochran William D , Endl Michael , Quarles Billy , Short Donald R , Torres Guillermo , Windmiller Gur , Yenawine Mitchell 
Published: February 2020

Abstract
We report the discovery of a Neptune-sized (

) transiting circumbinary planet, Kepler-1661 b, found in the Kepler photometry. The planet has a period of ∼175 days and its orbit precesses with a period of only 35 yr. The precession causes the alignment of the orbital planes to vary, and the planet is in a transiting configuration only ∼7% of the time as seen from Earth. As with several other Kepler circumbinary planets, Kepler-1661 b orbits close to the stability radius, and is near the (hot) edge of the habitable zone. The planet orbits a single-lined, grazing eclipsing binary, containing a 0.84

and 0.26

pair of stars in a mildly eccentric (e = 0.11), 28.2 day orbit. The system is fairly young, with an estimated age of ∼1–3 Gyr, and exhibits significant starspot modulations. The grazing eclipse configuration means the system is very sensitive to changes in the binary inclination, which manifests itself as a change in the eclipse depth. The starspots contaminate the eclipse photometry, but not in the usual way of inducing spurious eclipse timing variations. Rather, the starspots alter the normalization of the light curve, and hence the eclipse depths. This can lead to spurious eclipse depth variations, which are then incorrectly ascribed to binary orbital precession.
The Nucleosynthetic Yields of Core-collapse Supernovae: Prospects for the Next Generation of Gamma-Ray Astronomy
Authors: Andrews S. , Fryer C. , Even W. , Jones S. , Pignatari M. 
Published: February 2020

Abstract
Though the neutrino-driven convection model for the core-collapse explosion mechanism has received strong support in recent years, there are still many uncertainties in the explosion parameters—such as explosion energy, remnant mass, and end-of-life stellar abundances as initial conditions. Using a broad set of spherically symmetric core-collapse simulations we examine the effects of these key parameters on explosive nucleosynthesis and final explosion yields. The post-bounce temperature and density evolution of zero-age main-sequence 15, 20, and 25 solar mass progenitors are post-processed through the Nucleosynthesis Grid nuclear network to obtain detailed explosive yields. In particular, this study focuses on radio isotopes that are of particular interest to the next generation of gamma-ray astronomical observations: 43K, 47Ca, 44Sc, 47Sc, 48V, 48Cr, 51Cr, 52Mn, 59Fe, 56Co, 57Co, and 57Ni. These nuclides may be key in advancing our understanding of the inner workings of core-collapse supernovae by probing the parameters of the explosion engine. We find that the isotopes that are strong indicators of explosion energy are 43K, 47Ca, 44Sc, 47Sc, and 59Fe, those that are dependent on the progenitor structure are 48V, 51Cr, and 57Co, and those that probe neither are 48Cr, 52Mn, 57Ni, and 56Co. We discuss the prospects of observing these radionuclides in supernova remnants.
Interpreting Observations of Absorption Lines in the Circumgalactic Medium with a Turbulent Medium
Authors: Buie Edward , Fumagalli Michele , Scannapieco Evan 
Published: February 2020

Abstract
Single-phase photoionization equilibrium (PIE) models are often used to infer the underlying physical properties of galaxy halos probed in absorption with ions at different ionization potentials. To incorporate the effects of turbulence, we use the Models of Agitated and Illuminated Hindering and Emitting Media (MAIHEM) code to model an isotropic turbulent medium exposed to a redshift-zero metagalactic UV background, while tracking the ionizations, recombinations, and species-by-species radiative cooling for a wide range of ions. By comparing observations and simulations over a wide range of turbulent velocities, densities, and metallicity with a Markov chain Monte Carlo technique, we find that MAIHEM models provide an equally good fit to the observed low-ionization species compared to PIE models, while reproducing at the same time high-ionization species such as Si iv and O vi. By including multiple phases, MAIHEM models favor a higher metallicity (Z/Z
⊙ ≈ 40%) for the circumgalactic medium compared to PIE models. Furthermore, all of the solutions require some amount of turbulence (σ
3D

26 km s−1). Correlations between turbulence, metallicity, column density, and impact parameter are discussed alongside mechanisms that drive turbulence within the halo.
Nine Localized Deviations from Keplerian Rotation in the DSHARP Circumstellar Disks: Kinematic Evidence for Protoplanets Carving the Gaps
Authors: Pinte C. , Price D. J. , Ménard F. , Duchêne G. , Christiaens V. , Andrews S. M. , Huang J. , Hill T. , van der Plas G. , Perez L. M. , Isella A. , Boehler Y. , Dent W. R. F. , Mentiplay D. , Loomis R. A. 
Published: February 2020

Abstract
We present evidence for localized deviations from Keplerian rotation, i.e., velocity “kinks,” in 8 of the 18 circumstellar disks observed by the DSHARP program: DoAr 25, Elias 2–27, GW Lup, HD 143006, HD 163296, IM Lup, Sz 129, and WaOph 6. Most of the kinks are detected over a small range in both radial extent and velocity, suggesting a planetary origin, but for some of them foreground contamination prevents us from measuring their spatial and velocity extent. Because of the DSHARP limited spectral resolution and signal to noise in the 12CO J = 2−1 line, as well as cloud contamination, the kinks are usually detected in only one spectral channel, and will require confirmation. The strongest circumstantial evidence for protoplanets in the absence of higher spectral resolution data and additional tracers is that, upon deprojection, we find that all of the candidate planets lie within a gap and/or at the end of a spiral detected in dust continuum emission. This suggests that a significant fraction of the dust gaps and spirals observed by Atacama Large Millimeter/submillimeter Array in disks are caused by embedded protoplanets.
GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pc
Authors: Shporer Avi , Collins Karen A. , Astudillo-Defru Nicola , Irwin Jonathan , Bonfils Xavier , Collins Kevin I. , Matthews Elisabeth , Winters Jennifer G. , Anderson David R. , Armstrong James D. , Charbonneau David , Cloutier Ryan , Daylan Tansu , Gan Tianjun , Günther Maximilian N. , Hellier Coel , Horne Keith , Huang Chelsea X. , Jensen Eric L. N. , Kielkopf John , Palle Enric , Sefako Ramotholo , Stassun Keivan G. , Tan Thiam-Guan , Vanderburg Andrew , Ricker George R. , Latham David W. , Vanderspek Roland , Seager Sara , Winn Joshua N. , Jenkins Jon M. , Colon Knicole , Dressing Courtney D. , Léepine Sébastien , Muirhead Philip S. , Rose Mark E. , Twicken Joseph D. , Villasenor Jesus Noel 
Published: February 2020

Abstract
We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074

and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019

, 0.391 ± 0.020

) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TESS) data, ground-based photometry and spectroscopy, Gaia astrometry, and high angular resolution imaging to show that the transit signal seen in the TESS data must originate from a transiting planet. We do so by ruling out all false-positive scenarios that attempt to explain the transit signal as originating from an eclipsing stellar binary. Precise Doppler monitoring also leads to a tentative mass measurement of 2.09 ± 0.56 M
⊕. The host star proximity, brightness (V = 12.19 mag, K = 7.92 mag), low stellar activity, and the system’s short orbital period make this planet an attractive target for detailed characterization, including precise mass measurement, looking for other objects in the system, and planet atmosphere characterization.
A Mobile Application for Early Prediction of Student Performance Using Fuzzy Logic and Artificial Neural Networks
Authors: Nosseir Ann , Fathy Yahia 
Published: February 2020

<p class="Abstract">Identifying students at risk or potentials excellent students is increasingly important for higher education institutions to meet the needs of the students and develop efficient learning strategy. Early stage prediction can give an indication of the students’ performance during their study years. This helps tailoring an appropriate learning strategy for different groups.</p><p class="Abstract">This work develops a novel framework for a mobile app to predict the students’ performance before starting the Universities’ education. The framework is built on a University’s students data from year 2009-2017. It has three main components, namely, a neural network model that predicts the GPA, a mobile App that tests basic knowledge in different domains, and a fuzzy model that estimates the future students’ performance. </p>
Understanding Policy Influences on Health and Occupation Through the Use of the Life Course Health Development (LCHD) Framework
Authors: Pitonyak Jennifer S. , Pergolotti Mackenzi , Gupta Jyothi 
Published: February 2020

Abstract
Life course health development (LCHD) is a framework that considers the transactional nature of risks and protective factors along the life trajectory and how this context influences health. Public policies, from health care to education to social services to labor laws, have many goals, including lessening and eliminating health disparities, yet inequities in health services and outcomes remain. Policy is a contextual factor that may be overlooked when examining influences on health and occupation. As such, the LCHD framework may assist occupational therapy practitioners in understanding the influences of policy—both successes and failures—on occupation. In this article, we introduce the principles of LCHD and use this framework to illustrate analysis of a policy example of paid family leave, demonstrating how gaps in or unintended consequences of policy may contribute to disparities in health and occupation for certain populations.
Model of the propagation of very low-frequency beams in the Earth–ionosphere waveguide: principles of the tensor impedance method in multi-layered gyrotropic waveguides
Authors: Rapoport Yuriy , Grimalsky Vladimir , Fedun Viktor , Agapitov Oleksiy , Bonnell John , Grytsai Asen , Milinevsky Gennadi , Liashchuk Alex , Rozhnoi Alexander , Solovieva Maria , Gulin Andrey 
Published: February 2020

Abstract. The modeling of very low-frequency (VLF) electromagnetic (EM) beam propagation in the Earth–ionosphere waveguide (WGEI) is considered. A new tensor impedance method for modeling the propagation of electromagnetic beams in a multi-layered and inhomogeneous waveguide is presented. The waveguide is assumed to possess the gyrotropy and inhomogeneity with a thick cover layer placed above the waveguide. The influence of geomagnetic field inclination and carrier beam frequency on the characteristics of the polarization transformation in the Earth–ionosphere waveguide is determined. The new method for modeling the propagation of electromagnetic beams allows us to study the (i) propagation of the very low-frequency modes in the Earth–ionosphere waveguide and, in perspective, their excitation by the typical Earth–ionosphere waveguide sources, such as radio wave transmitters and lightning discharges, and (ii) leakage of Earth–ionosphere waveguide waves into the upper ionosphere and magnetosphere. The proposed approach can be applied to the variety of problems related to the analysis of the propagation of electromagnetic waves in layered gyrotropic and anisotropic active media in a wide frequency range, e.g., from the Earth–ionosphere waveguide to the optical waveband, for artificial signal propagation such as metamaterial microwave or optical waveguides.
Synthesis and evaluation of historical meridional heat transport from midlatitudes towards the Arctic
Authors: Liu Yang , Attema Jisk , Moat Ben , Hazeleger Wilco 
Published: February 2020

Abstract. Meridional energy transport (MET), both in the atmosphere (AMET) and ocean (OMET), has significant impact on the climate in the Arctic. In this study, we quantify AMET and OMET at subpolar latitudes from six reanalysis data sets. We investigate the differences between the data sets and we check the coherence between MET and the Arctic climate variability at interannual timescales. The results indicate that, although the mean transport in all data sets agrees well, the spatial distributions and temporal variations of AMET and OMET differ substantially among the reanalysis data sets. For the ocean, only after 2007, the low-frequency signals in all reanalysis products agree well. A further comparison with observed heat transport at 26.5∘ N and the subpolar Atlantic, and a high-resolution ocean model hindcast confirms that the OMET estimated from the reanalysis data sets are consistent with the observations. For the atmosphere, the differences between ERA-Interim and the Japanese 55-year Reanalysis (JRA-55) are small, while the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2) differs from them. An extended analysis of linkages between Arctic climate variability and AMET shows that atmospheric reanalyses differ substantially from each other. Among the chosen atmospheric products, ERA-Interim and JRA-55 results are most consistent with those from coupled climate models. For the ocean, the Ocean Reanalysis System 4 (ORAS4) and Simple Ocean Data Assimilation version 3 (SODA3) agree well on the relation between OMET and sea ice concentration (SIC), while the GLobal Ocean reanalyses and Simulations version 3 (GLORYS2V3) deviates from those data sets. The regressions of multiple fields in the Arctic on both AMET and OMET suggest that the Arctic climate is sensitive to changes of meridional energy transport at subpolar latitudes in winter. Given the good agreement on the diagnostics among assessed reanalysis products, our study suggests that the reanalysis products are useful for the evaluation of energy transport. However, assessments of products with the AMET and OMET estimated from reanalysis data sets beyond interannual timescales should be conducted with great care and the robustness of results should be evaluated through intercomparison, especially when studying variability and interactions between the Arctic and midlatitudes.
A spatially explicit database of wind disturbances in European forests over the period 2000–2018
Authors: Forzieri Giovanni , Pecchi Matteo , Girardello Marco , Mauri Achille , Klaus Marcus , Nikolov Christo , Rüetschi Marius , Gardiner Barry , Tomaštík Julián , Small David , Nistor Constantin , Jonikavicius Donatas , Spinoni Jonathan , Feyen Luc , Giannetti Francesca , Comino Rinaldo , Wolynski Alessandro , Pirotti Francesco , Maistrelli Fabio , Savulescu Ionut , Wurpillot-Lucas Stéphanie , Karlsson Stefan , Zieba-Kulawik Karolina , Strejczek-Jazwinska Paulina , Mokroš Martin , Franz Stefan , Krejci Lukas , Haidu Ionel , Nilsson Mats , Wezyk Piotr , Catani Filippo , Chen Yi-Ying , Luyssaert Sebastiaan , Chirici Gherardo , Cescatti Alessandro , Beck Pieter S. A. 
Published: February 2020

Abstract. Strong winds may uproot and break trees and represent a major natural disturbance for European forests. Wind disturbances have intensified over the last decades globally and are expected to further
rise in view of the effects of climate change. Despite the importance of such natural disturbances, there are currently no spatially explicit databases of wind-related impact at a pan-European scale. Here, we present a new database of wind disturbances in European forests (FORWIND). FORWIND is comprised of more than 80 000 spatially delineated areas in Europe that were disturbed by wind in the period 2000–2018 and describes them in a harmonized and consistent geographical vector format. The database includes all major windstorms that occurred over the observational period (e.g. Gudrun, Kyrill, Klaus, Xynthia and Vaia) and represents approximately 30 % of the reported damaging wind events in Europe. Correlation analyses between the areas in FORWIND and land cover changes retrieved from the Landsat-based Global Forest Change dataset and the MODIS Global Disturbance Index corroborate the robustness of FORWIND. Spearman rank coefficients range between 0.27 and 0.48 (p value < 0.05). When recorded forest areas are rescaled based on their damage degree, correlation increases to 0.54. Wind-damaged growing stock volumes reported in national inventories (FORESTORM dataset) are generally higher than analogous metrics provided by FORWIND in combination with satellite-based biomass and country-scale statistics of growing stock volume. The potential of FORWIND is explored for a range of challenging topics and scientific fields, including scaling relations of wind damage, forest vulnerability modelling, remote sensing monitoring of forest disturbance, representation of uprooting and breakage of trees in large-scale land surface models, and hydrogeological risks following wind damage. Overall, FORWIND represents an essential and open-access spatial source that can be used to improve the understanding, detection and prediction of wind disturbances and the consequent impacts on forest ecosystems and the land–atmosphere system. Data sharing is encouraged in order to continuously update and improve FORWIND. The dataset is available at https://doi.org/10.6084/m9.figshare.9555008
(Forzieri et al., 2019).
A dataset of tracer concentrations and meteorological observations from the Bolzano Tracer EXperiment (BTEX) to characterize pollutant dispersion processes in an Alpine valley
Authors: Falocchi Marco , Tirler Werner , Giovannini Lorenzo , Tomasi Elena , Antonacci Gianluca , Zardi Dino 
Published: February 2020

Abstract. The paper describes the dataset of concentrations and related meteorological measurements collected during the field campaign of the Bolzano Tracer Experiment (BTEX).
The experiment was performed to characterize the dispersion of pollutants emitted from a waste incinerator in the basin of the city of Bolzano, in the Italian Alps.
As part of the experiment, two controlled releases of a passive gas tracer (sulfur hexafluoride, SF6) were performed through the stack of the incinerator on 14 February 2017 for two different time lags, starting, respectively, at 07:00 and 12:45 LST.
Samples of ambient air were collected at target sites with vacuum-filled glass bottles and polyvinyl fluoride bags, and they were later analyzed by means of a mass spectrometer (detectability limit 30 pptv).
Meteorological conditions were monitored by a network of 15 surface weather stations, 1 microwave temperature profiler, 1 sodar and 1 Doppler wind lidar. The dataset represents one of the few examples available in the literature concerning dispersion processes in a typical mountain valley environment, and it provides a useful benchmark for testing atmospheric dispersion models in complex terrain.
The dataset described in this paper is available at https://doi.org/10.1594/PANGAEA.898761 (Falocchi et al., 2019).
Computational analysis of intermolecular Diels–Alder reactions of methyl 2-(methyl(phenyl)carbamoyl)acrylate with cyclic dienes
Authors: Sizemore Nicholas , Heil Elysia 
Published: February 2020

abstract
The synthetic method recently established by Spivey and co-workers describes the intermolecular Diels–Alder reactions between α-aminoacrylate(s) dienophiles and cyclic dienes. These reactions gave stereoisomeric mixtures of endo and exo products. A computational study was undertaken in an effort to identify a method of analysis that would yield results similar to those of the synthetic experiments. Starting materials, transition state estimates, and products were subjected to conformational analysis (MMFF) using the Spartan molecular modeling program (Spartan’16). The low-energy conformations produced for each molecule were subjected to density functional theory calculations at the B3LYP 6-31+G(d) level of theory using the Gaussian09 program. The results of this computational study are described. These calculations provide information about molecular geometry and energy values of the reaction that will be compared with the experimental results in an effort to verify whether computational analysis supports the stereoselectivity observed in physical experimentation.
Teresa Brennan, William James, and the Energetic Demands of Ethics
Authors: Guilmette Lauren 
Published: February 2020

ABSTRACT
This article engages the late feminist philosopher Teresa Brennan in conversation with William James on “energetics” and “living attention.” Brennan should be prominent in what has been called the “affective turn”; yet, due to her untimely death, she remains peripheral. Against this trend, Shannon Sullivan (2015) recently appealed to Brennan's Transmission of Affect (2004) to supplement James on emotion, recalibrating his sense of energetic relationality at times obscured by Victorian individualistic tropes. I extend Sullivan's claim to consider how Brennan builds upon a Jamesian discourse of “energy” to describe the concrete possibilities of—and structural obstacles to—solidarity, with concern for the circulation of affects that energize some and drain others. While Brennan rarely references James, her papers in Brown's Feminist Theory Archive show that she read him actively in her last years, planning to write her next book on “consciousness.” It is less surprising, then, that Brennan's theories would resonate with Jamesian ideas, and I develop this resonance in Brennan's published work.
A Heuristic Theory of Metrical Transformation and Tune Metamorphosis: Tracking Creativity in Traditional Cantonese Opera
Authors: Yung Bell 
Published: February 2020

Abstract
This article shows how the ambiguous nature of the metrical structure of the preexistent tunes used in Cantonese opera, which Rulan Chao Pian called “aria types,” allows for multiple interpretations. The flexibility inherent in such metrical ambiguity enables singers to create new musical expressions, leading to new versions and eventually to new aria types that enrich the repertoire. In tracking these processes, the article aims to provide a nuanced understanding of the “preexistent” nature of tunes and to suggest the creativity of the singers.
中國傳統戲曲利用板腔體曲調的多元化表達戲劇中喜怒哀樂等情感。從純音樂節奏方面 看，粵劇板腔曲調中詞格與曲格的分佈關係引起強弱拍衝突，形成節拍轉型，使唱腔節奏 靈活多變，啓發演員即興創作，推動板腔曲調的演變發展。本文以慢板，快中板，和快點 為例闡釋對以上的幾點體會
Bang Nong Saeng
Authors: Sarquella Pau 
Published: February 2020

The text takes three experiences from the author to develop three different tòpics as layers of architectural interest.The first, references new young practices and their ephemeral architectures, which due to their freedom, are seen as a key point in architectural speculation and advancement.The second uses Persiana Barcelona, an industrial product designed out of an architectural competition, to talk about different and non-standard ways of making architecture. It also states the need of our society to learn again how to inhabit the spaces we dwell. The third and last, talks about the experience the author had when living and working for four years in a tropical country highly influenced by its climate. He also presents some of the aspects and ideas behind a community project he developed in that area.