bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Multi-planet System Transiting the V = 9 Rapidly Rotating F-Star HD 106315
Authors: Rodriguez Joseph E. , Zhou George , Vanderburg Andrew , Eastman Jason D. , Kreidberg Laura , Cargile Phillip A. , Bieryla Allyson , Latham David W. , Irwin Jonathan , Mayo Andrew W. , Calkins Michael L. , Esquerdo Gilbert A. , Mink Jessica 
Published: May 2017

Abstract
We report the discovery of a multi-planet system orbiting HD 106315, a rapidly rotating mid F-type star, using data from the K2 mission. HD 106315 hosts a 2.51 ± 0.12 R
⊕ sub-Neptune in a 9.5-day orbit and a

super-Neptune in a 21-day orbit. The projected rotational velocity of HD 106315 (12.9 km s−1) likely precludes precise measurements of the planets’ masses but could enable a measurement of the sky-projected spin–orbit obliquity for the outer planet via Doppler tomography. The eccentricities of both planets were constrained to be consistent with 0, following a global modeling of the system that includes a Gaia distance and dynamical arguments. The HD 106315 system is one of few multi-planet systems hosting a Neptune-sized planet for which orbital obliquity measurements are possible, making it an excellent test-case for formation mechanisms of warm-Neptunian systems. The brightness of the host star also makes HD 106315 c a candidate for future transmission spectroscopic follow-up studies.
An Expanded Chemo-dynamical Sample of Red Giants in the Bar of the Large Magellanic Cloud
Authors: Song 宋 Ying-Yi 盈亿 , Mateo Mario , Walker Matthew G. , Roederer Ian U. 
Published: May 2017

Abstract
We report new spectroscopic observations obtained with the Michigan/Magellan Fiber System of 308 red giants (RGs) located in two fields near the photometric center of the bar of the Large Magellanic Cloud. This sample consists of 131 stars observed in previous studies (in one field) and 177 newly observed stars (in the second field) selected specifically to more reliably establish the metallicity and age distributions of the bar. For each star, we measure its heliocentric line-of-sight velocity, surface gravity, and metallicity from its high-resolution spectrum (effective temperatures come from photometric colors). The spectroscopic Hertzsprung–Russell diagrams—modulo small offsets in surface gravities—reveal good agreement with model isochrones. The mean metallicity of the 177-RG sample is [Fe/H] = −0.76 ± 0.02 with a metallicity dispersion σ = 0.28 ± 0.03. The corresponding metallicity distribution—corrected for selection effects—is well fitted by two Gaussian components: one metal-rich with a mean −0.66 ± 0.02 and a standard deviation 0.17 ± 0.01, and the other metal-poor with −1.20 ± 0.24 and 0.41 ± 0.06. The metal-rich and metal-poor populations contain approximately 85% and 15% of stars, respectively. We also confirm that the velocity dispersion in the bar center decreases significantly from 31.2 ± 4.3 to 18.7 ± 1.9 km s−1 with increasing metallicity over the range −2.09 to −0.38. Individual stellar masses are estimated using the spectroscopic surface gravities and the known luminosities. We find that lower mass, hence older, RGs have larger metallicity dispersion and lower mean metallicity than the higher-mass, younger RGs. The estimated masses, however, extend to implausibly low values (

), making it impossible to obtain an absolute age–metallicity or age distribution of the bar.
Indication of the Hanle Effect by Comparing the Scattering Polarization Observed by CLASP in the Lyα and Si iii 120.65 nm Lines
Authors: Ishikawa R. , Bueno J. Trujillo , Uitenbroek H. , Kubo M. , Tsuneta S. , Goto M. , Kano R. , Narukage N. , Bando T. , Katsukawa Y. , Ishikawa S. , Giono G. , Suematsu Y. , Hara H. , Shimizu T. , Sakao T. , Winebarger A. , Kobayashi K. , Cirtain J. , Champey P. , Auchère F. , Štěpán J. , Belluzzi L. , Ramos A. Asensio , Sainz R. Manso , De Pontieu B. , Ichimoto K. , Carlsson M. , Casini R. 
Published: May 2017

Abstract
The Chromospheric Lyman-Alpha Spectro-Polarimeter is a sounding rocket experiment that has provided the first successful measurement of the linear polarization produced by scattering processes in the hydrogen Lyα line (121.57 nm) radiation of the solar disk. In this paper, we report that the Si iii line at 120.65 nm also shows scattering polarization and we compare the scattering polarization signals observed in the Lyα and Si iii lines in order to search for observational signatures of the Hanle effect. We focus on four selected bright structures and investigate how the U/I spatial variations vary between the Lyα wing, the Lyα core, and the Si iii line as a function of the total unsigned photospheric magnetic flux estimated from Solar Dynamics Observatory/Helioseismic and Magnetic Imager observations. In an internetwork region, the Lyα core shows an antisymmetric spatial variation across the selected bright structure, but it does not show it in other more magnetized regions. In the Si iii line, the spatial variation of U/I deviates from the above-mentioned antisymmetric shape as the total unsigned photospheric magnetic flux increases. A plausible explanation of this difference is the operation of the Hanle effect. We argue that diagnostic techniques based on the scattering polarization observed simultaneously in two spectral lines with very different sensitivities to the Hanle effect, like Lyα and Si iii, are of great potential interest for exploring the magnetism of the upper solar chromosphere and transition region.
Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities
Authors: Ni Lei , Zhang Qing-Min , Murphy Nicholas A. , Lin Jun 
Published: May 2017

Abstract
We perform 2D resistive magnetohydrodynamic simulations of coronal jets driven by flux emergence along the lower boundary. The reconnection layers are susceptible to the formation of blobs that are ejected in the jet. Our simulation with low plasma β (Case I) shows that magnetic islands form easily and propagate upward in the jet. These islands are multithermal and thus are predicted to show up in hot channels (335 Å and 211 Å) and the cool channel (304 Å) in observations by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. The islands have maximum temperatures of 8 MK, lifetimes of 120 s, diameters of 6 Mm, and velocities of 200 km s−1. These parameters are similar to the properties of blobs observed in extreme-ultraviolet (EUV) jets by AIA. The Kelvin–Helmholtz instability develops in our simulation with moderately high plasma β (Case II) and leads to the formation of bright vortex-like blobs above the multiple high magnetosonic Mach number regions that appear along the jet. These vortex-like blobs can also be identified in the AIA channels. However, they eventually move downward and disappear after the high magnetosonic Mach number regions disappear. In the lower plasma β case, the lifetime for the jet is shorter, the jet and magnetic islands are formed with higher velocities and temperatures, the current-sheet fragments are more chaotic, and more magnetic islands are generated. Our results show that the plasmoid instability and Kelvin–Helmholtz instability along the jet are both possible causes of the formation of blobs observed at EUV wavelengths.
Global MHD Simulations of Accretion Disks in Cataclysmic Variables (CVs). II. The Relative Importance of MRI and Spiral Shocks
Authors: Ju Wenhua , Stone James M. , Zhu Zhaohuan 
Published: May 2017

Abstract
We perform global three-dimensional MHD simulations of unstratified accretion disks in cataclysmic variables (CVs). By including mass inflow via an accretion stream, we are able to evolve the disk to a steady state. We investigate the relative importance of spiral shocks and the magnetorotational instability (MRI) in driving angular momentum transport and how each depend on the geometry and strength of the seed magnetic field and the Mach number of the disk (where Mach number is the ratio of the azimuthal velocity and the sound speed of gas). We use a locally isothermal equation of state and adopt temperature profiles that are consistent with CV disk observations. Our results indicate that the relative importance of spiral shocks and MRI in driving angular momentum transport is controlled by the gas Mach number and the seed magnetic field strength. MRI and spiral shocks provide comparable efficiency of angular momentum transport when the disk Mach number is around 10 and the seed magnetic field has plasma

(where β is the ratio of gas pressure and magnetic pressure). The MRI dominates whenever the seed field strength, or the disk Mach number, is increased. Among all of our simulations, the effective viscosity parameter

after MRI saturates and the disk reaches steady state. Larger values of

are favored when the seed magnetic field has vertical components or the flow has stronger magnetization (

). Our models all indicate that the role of MRI in driving angular momentum transport thus mass accretion in CV disks is indispensable, especially in cool disks with weak spiral shocks.
Further Constraints on Variations in the Initial Mass Function from Low-mass X-ray Binary Populations
Authors: Peacock Mark B. , Zepf Stephen E. , Kundu Arunav , Maccarone Thomas J. , Lehmer Bret D. , Maraston Claudia , Gonzalez Anthony H. , Eufrasio Rafael T. , Coulter David A. 
Published: May 2017

Abstract
We present constraints on variations in the initial mass function (IMF) of nine local early-type galaxies based on their low-mass X-ray binary (LMXB) populations. Comprised of accreting black holes and neutron stars, these LMXBs can be used to constrain the important high-mass end of the IMF. We consider LMXB populations beyond the cores of the galaxies (>0.2R
e; covering 75%–90% of their stellar light) and find no evidence for systematic variations of the IMF with velocity dispersion (σ). We reject IMFs which become increasingly bottom-heavy with σ, up to steep power laws (exponent, α > 2.8) in massive galaxies (σ > 300

), for galactocentric radii >1/4 R
e. Previously proposed IMFs that become increasingly bottom-heavy with σ are consistent with these data if only the number of low-mass stars (<0.5 M
⊙) varies. We note that our results are consistent with some recent work which proposes that extreme IMFs are only present in the central regions of these galaxies. We also consider IMFs that become increasingly top-heavy with σ, resulting in significantly more LMXBs. Such a model is consistent with these observations, but additional data are required to significantly distinguish between this and an invariant IMF. For six of these galaxies, we directly compare with published “IMF mismatch” parameters from the Atlas3D survey, α
dyn. We find good agreement with the LMXB population if galaxies with higher α
dyn have more top-heavy IMFs—although we caution that our sample is quite small. Future LMXB observations can provide further insights into the origin of α
dyn variations.
A description of the naturalised <i>Clusia rosea</i> Jacq. (Clusiaceae) populations in South Africa
Authors: Cheek Michael D. , Lalla Reshnee 
Published: May 2017

Background: Clusia rosea is an ornamental plant that has been cultivated in South Africa since the late 19th century. Ornamental plant species are known to be a source of invasive plants.Objectives: To document the current distribution of C. rosea in South Africa and its naturalisation status.Method: Reports of C. rosea were verified in the field and herbarium vouchers were collected. Coordinates were taken for each plant, their reproductive status was assessed and heights were measured. In addition, the Southern African Plant Invaders Atlas database and five herbaria were checked for records.Results: A total of 284 plants were found outside of cultivation, mostly in the KwaZulu-Natal Coastal Belt Grassland. Clusia rosea appears to be reproducing through apomixis. No records of naturalisation could be found elsewhere in Africa.Conclusion: It is recommended that C. rosea be added to the Species Under Surveillance – Possible Eradication or Containment Targets (SUSPECT) list to investigate whether it requires formal legal listing.
The church as a transformation and change agent
Authors: Pillay Jerry 
Published: May 2017

This article traces the historical impact of the church in transforming, developing and changing society. It looks at how the church in selected periods in history, mainly in the reformation era, worked towards the transformation of society and communities. Extracting from these the author attempts to show how this can be applied to the church in the South African context. Further, the author explores the changing dynamics and characteristics of being church today and establishes that it is not so much about what the church believes, but in what it does that matters most in this day and age. The author, with the latter thought in mind, expresses that community transformation has to be an integral part of the ministry of the church today.
Metaphysical perspectives on YHWH as a fictional entity in the Hebrew Bible
Authors: Gericke Jacobus W. 
Published: May 2017

Within a literary ontology, YHWH in the Hebrew Bible is technically also a fictional entity or object. In Hebrew Bible scholarship, a variety of philosophical issues surrounding fiction have received sustained and in-depth attention. However, the mainstream research on these matters tends to focus on the philosophical foundations of or backgrounds to a particular literary theory, rather than on metaphysical puzzles as encountered in the philosophy of fiction proper. To fill this gap, the present article seeks to provide a meta-theoretical overview of the main contemporary philosophical perspectives on the metaphysics of fictional objects. Three views (and their sub-currents) are discussed, namely possibilism, (neo-)Meinongianism and (literary) creationism. Each view’s theory is introduced and critically appropriated with reference to what is implied to be an answer to the question of what exactly the biblical character YHWH can meaningfully be said to be in the context of the metaphysics of fictional objects. In this way, the present study also goes beyond the traditional concern with the nature of God in Old Testament theology.
New particle formation in the Svalbard region 2006–2015
Authors: Heintzenberg Jost , Tunved Peter , Galí Martí , Leck Caroline 
Published: May 2017

Abstract. Events of new particle formation (NPF) were analyzed in a 10-year data set of hourly particle size distributions recorded on Mt. Zeppelin, Spitsbergen, Svalbard. Three different types of NPF events were identified through objective search algorithms. The first and simplest algorithm utilizes short-term increases in particle concentrations below 25 nm (PCT (percentiles) events). The second one builds on the growth of the sub-50 nm diameter median (DGR (diameter growth) events) and is most closely related to the classical banana type of event. The third and most complex, multiple-size approach to identifying NPF events builds on a hypothesis suggesting the concurrent production of polymer gel particles at several sizes below ca. 60 nm (MEV (multi-size growth) events). As a first and general conclusion, we can state that NPF events are a summer phenomenon and not related to Arctic haze, which is a late winter to early spring feature. The occurrence of NPF events appears to be somewhat sensitive to the available data on precipitation. The seasonal distribution of solar flux suggests some photochemical control that may affect marine biological processes generating particle precursors and/or atmospheric photochemical processes that generate condensable vapors from precursor gases. Notably, the seasonal distribution of the biogenic methanesulfonate (MSA) follows that of the solar flux although it peaks before the maxima in NPF occurrence. A host of ancillary data and findings point to varying and rather complex marine biological source processes. The potential source regions for all types of new particle formation appear to be restricted to the marginal-ice and open-water areas between northeastern Greenland and eastern Svalbard. Depending on conditions, yet to be clarified new particle formation may become visible as short bursts of particles around 20 nm (PCT events), longer events involving condensation growth (DGR events), or extended events with elevated concentrations of particles at several sizes below 100 nm (MEV events). The seasonal distribution of NPF events peaks later than that of MSA and DGR, and in particular than that of MEV events, which reach into late summer and early fall with open, warm, and biologically active waters around Svalbard. Consequently, a simple model to describe the seasonal distribution of the total number of NPF events can be based on solar flux and sea surface temperature, representing environmental conditions for marine biological activity and condensation sink, controlling the balance between new particle nucleation and their condensational growth. Based on the sparse knowledge about the seasonal cycle of gel-forming marine microorganisms and their controlling factors, we hypothesize that the seasonal distribution of DGR and, more so, MEV events reflect the seasonal cycle of the gel-forming phytoplankton.
Probabilistic flood extent estimates from social media flood observations
Authors: Brouwer Tom , Eilander Dirk , van Loenen Arnejan , Booij Martijn J. , Wijnberg Kathelijne M. , Verkade Jan S. , Wagemaker Jurjen 
Published: May 2017

Abstract. The increasing number and severity of floods, driven by phenomena such as urbanization, deforestation, subsidence and climate change, create a growing need for accurate and timely flood maps. In this paper we present and evaluate a method to create deterministic and probabilistic flood maps from Twitter messages that mention locations of flooding. A deterministic flood map created for the December 2015 flood in the city of York (UK) showed good performance (F(2) =  0.69; a statistic ranging from 0 to 1, with 1 expressing a perfect fit with validation data). The probabilistic flood maps we created showed that, in the York case study, the uncertainty in flood extent was mainly induced by errors in the precise locations of flood observations as derived from Twitter data. Errors in the terrain elevation data or in the parameters of the applied algorithm contributed less to flood extent uncertainty. Although these maps tended to overestimate the actual probability of flooding, they gave a reasonable representation of flood extent uncertainty in the area. This study illustrates that inherently uncertain data from social media can be used to derive information about flooding.
Secondary Sulcus-Fixed Foldable IOL Implantation with 25-G Infusion in Patients with Previous PPV after Open-Globe Injury
Authors: He Tiangeng , You Caiyun , Chen Song , Meng Xiangda , Liu Yuanyuan , Yan Hua 
Published: May 2017

Purpose To evaluate the safety and efficacy of secondary sulcus-fixed foldable intraocular lens (IOL) implantation through a clear corneal incision with 25-G infusion in patients with previous pars plana vitrectomy (PPV) after open-globe injury, and to analyze postoperative outcomes and prognostic factors of treatment. Methods Clinical data of 89 eyes of 89 patients with open-globe injury who underwent secondary sulcus-fixed foldable IOL implantation through a clear corneal incision with 25-G infusion after vitrectomy in our hospital between January 2008 and June 2015 were retrospectively analyzed. The examinations before IOL implantation mainly included visual acuity, slit-lamp examination, direct and indirect ophthalmoscope, visual electrophysiology, corneal endothelium, B scan, ultrasound biomicroscope, and intraocular pressure. Five eyes underwent suturing of peripheral iris and 7 eyes underwent suturing of iris laceration simultaneously. The mean follow-up was 18 months with a range from 6 months to 8 years. Results The mean interval between secondary sulcus-fixed foldable IOL implantation and vitrectomy was 2.8 months with a range from 2 to 6 months. The uncorrected visual acuity improved in all patients with a well-centered IOL ranging from 0.1 to 0.8 with the best-corrected visual acuity from 0.1 to 1.0 after secondary IOL implantation. The postoperative complications mainly included mild anterior chamber exudates in 10 eyes (11%), temporary IOP elevation in 12 eyes (13%), and recurrent retinal detachment in 5 eyes (6%), which were subsequently managed by surgery. Conclusions The interval of 2.8 months between vitrectomy and secondary IOL implantation is an appropriate and safe option to correct aphakia in patients receiving vitrectomy for open-globe injury.
Infection in Critically Ill Pediatric Patients on Continuous Renal Replacement Therapy
Authors: Santiago Maria J. , López-Herce Jesús , Vierge Eva , Castillo Ana , Bustinza Amaya , Bellón Jose M. , Sánchez Amelia , Fernández Sarah 
Published: May 2017

Introduction Continuous renal replacement therapies (CRRT) are frequently used in critically ill children and may increase the risk of infection. However, the incidence, characteristics and prognosis of infection in critically ill children on CRRT have not been studied. Methods Data from a prospective, single-center register of critically ill children treated with CRRT was analyzed. Results 55 children (40% under 1 year of age) were treated with CRRT between June 2008 and January 2012; 43 patients (78.2%) presented 1 or more infections. The most common condition of patients requiring CRRT was heart disease (69%). Infection occurred a median of 11 days after the initiation of CRRT (IQ range: 4 to 21 days). A total of 21 patients (48.8 %) developed 1 infection, 7 (16.2%) developed 2 infections and 15 (34.9%) developed 3 or more infections. The most frequent infection was catheter-related bacteremia, with no differences in catheter location. CRRT duration longer than 4.5 days was the only risk factor for infection. Patients with infection had a longer length of stay (LOS) in the Pediatric Intensive Care Unit (PICU) than patients without it (37.8 vs. 17.6, p = 0.019), but there were no differences in mortality (30.2% vs. 33.3%; p = 0.84). Conclusions Infection rate is high in critically ill children treated with CRRT. More than 4 days of CRRT increases the risk of infection. Infection in these patients entails a longer stay in the PICU but did not increase mortality.
Testing of a Novel Percutaneous Temporary Aortic Valve in a Rabbit Model of Acute Severe Aortic Regurgitation: An Experimental Study
Authors: Ho Paul C. 
Published: May 2017

Purpose Device management of hemodynamic instability due to acute aortic regurgitation is not available. A novel, catheter-based, temporary aortic valve (TAV) has been in development. Early prototypes (balloon-based TAV) have undergone proof-of-concept studies in mathematical, bench and animal models. The redesigned membrane-based TAV prototype is evaluated in a rabbit model of acute severe aortic regurgitation. Methods Acute aortic regurgitation was simulated by deploying a self-expanding endovascular stent across the aortic annulus. Eight rabbits of body weights ranging 4.9–5.4 kg were randomly assigned to two groups: those received additional hemodynamic support with the TAV prototype immediately after aortic regurgitation was induced versus no TAV support. The survival times of the two groups were compared. Results Comparing the groups with TAV versus without TAV, the mean body weights were similar: 4.99 ± 0.06 vs. 5.10 ± 0.22 kg (p = 0.71). The mean stent sizes used to create acute aortic regurgitation were similar: 6.25 ± 0.50 vs. 6.75 ± 0.50 mm, respectively (p = 0.53). The mean survival times also did not differ significantly: 21.00 ± 15.41 vs. 8.25 ± 2.75 minutes, respectively (p = 0.45). A slight trend appeared to be in favor of longer survival in the TAV supported group. Conclusions In a rabbit model of acute massive aortic regurgitation, the use of the TAV support prototype did not hasten the animals’ death, but rather survival may be enhanced by the use of the device. Future studies specifically designed to evaluate the efficacy of the TAV catheter can be valuable in this new technology.