bluuebunny/crossref_metadata_2025_split huggingface dataset:
HUBUNGAN ANTARA USIA DAN TINGKAT PENDIDIKAN DENGAN TINGKAT PENGETAHUAN IBU HAMIL TENTANG PERAWATAN PAYUDARA SELAMA HAMIL DI POLI KANDUNGAN RSU JASEM, SIDOARJO
Authors: Sulistyowati Agus , Putra Kusuma Wijaya Ridi , Umami Riza 
Published: October 2019

Introduction. Perawatan payudara merupakan kebutuhan perawatan diri yang diperlukan untukÂ meningkatkan kesehatan terutama pada ibu hamil. Fenomena yang terjadi poliÂ kandungan di RSU Jasem Sidoarjo. Banyak ibu yang merawat payudaranya selamaÂ hamil tidak terawatt dengan baik dan benar, sebagian besar para ibu saat hamil tidakÂ melakukan perawatan payudaranya, tujuan penelitian ini adalah untuk mengetahuiÂ tingkat pengetahuan ibu hamil tentang perawatan payudara selama hamil.Methods. Metode penelitian yang digunakan adalah deskriptif. Populasi dalam penelitian ini berjumlah 30 Responden sampel sebanyak 30 responden diambil dengan teknik sampling quota sampling teknik pengumpulan data menggunakan kuesioner jenis close-ended questionnaire dengan jumlah pertanyaan sebanyak 10 soal. Setelah data terkumpulkan dilakukan Uji statistik Pearsonâ€™s product moment correlation dengan menggunakan SPSS 21.Result. Terdapat hubungan yang positif antara usia dan tingkat pendidikan dengan tingkat pengetahuan ibu hamil tentang perawatan payudara selama hamil (r = .564, p < .01; r = .560, p < .01, secara berurutan).Conclusion. Dari hasil penelitian tersebut disimpulkan hubungan yang positif antara pertambahan usia dan tingkat pendidikan dengan tingkat pengetahuan ibu hamil tentang perawatan payudara selama hamil.Â Kata kunci: Tingkat pengetahuan, ibu, perawatan payudara selama hamil.
Discovery and Identification of MAXI J1621–501 as a Type I X-Ray Burster with a Super-orbital Period
Authors: Gorgone Nicholas M. , Kouveliotou Chryssa , Negoro Hitoshi , Wijers Ralph A. M. J. , Bozzo Enrico , Guiriec Sylvain , Bult Peter , Huppenkothen Daniela , Göğüş Ersin , Bahramian Arash , Kennea Jamie , Linford Justin D. , Miller-Jones James , Baring Matthew G. , Beniamini Paz , Chakrabarty Deepto , Granot Jonathan , Hailey Charles , Harrison Fiona A. , Hartmann Dieter H. , Iwakiri Wataru , Kaper Lex , Kara Erin , Mazzola Simona , Murata Katsuhiro , Stern Daniel , Tomsick John A. , Horst Alexander J. van der , Younes George A. 
Published: October 2019

Abstract
MAXI J1621–501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations with NuSTAR revealed two Type I X-ray bursts, identifying MAXI J1621–501 as a low mass x-ray binary with a neutron star primary. Overall, 24 Type I bursts were detected from the source during a 15 month period. At energies below 10 keV, the source spectrum was best fit with three components: an absorbed blackbody with kT = 2.3 keV, a cutoff power law with index Γ = 0.7, and an emission line centered on 6.3 keV. Timing analysis of the X-ray persistent emission and burst data has not revealed coherent pulsations from the source or an orbital period. We identified, however, a super-orbital period ∼78 days in the source X-ray light curve. This period agrees very well with the theoretically predicted radiative precession period of ∼82 days. Thus, MAXI J1621–501 joins a small group of sources characterized with super-orbital periods.
Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors
Authors: Yuan Shuo , Pan Chuzhong , Liu Xiangkun , Wang Qiao , Fan Zuhui 
Published: October 2019

Abstract
Weak lensing peak abundance analyses have been applied in different surveys and demonstrated to be a powerful statistic in extracting cosmological information complementary to cosmic shear two-point correlation studies. Future large surveys with high number densities of galaxies will enable tomographic peak analyses. Focusing on high peaks, we investigate quantitatively how the tomographic redshift binning can enhance the cosmological gains. We also perform detailed studies about the degradation of cosmological information due to photometric redshift (photo-z) errors. We show that for surveys with a number density of galaxies of ∼40 arcmin−2, a median redshift of ∼1, and a survey area of ∼15,000 deg2, the four-bin tomographic peak analyses can reduce the error contours of (Ωm, σ
8) by a factor of 5 compared to 2D peak analyses in the ideal case of the photo-z error being absent. More redshift bins can hardly lead to significantly better constraints. The photo-z error model here is parameterized by z
bias and σ
ph and the fiducial values of z
bias = 0.003 and σ
ph = 0.02 are taken. We find that using tomographic peak analyses can constrain the photo-z errors simultaneously with cosmological parameters. For four-bin analyses, we can obtain σ(z
bias)/z
bias ∼ 10% and σ(σ
ph)/σ
ph ∼ 5% without assuming priors on them. Accordingly, the cosmological constraints on Ωm and σ
8 degrade by factors of ∼2.2 and ∼1.8, respectively, with respect to zero uncertainties on photo-z parameters. We find that the uncertainty of z
bias plays a more significant role in degrading the cosmological constraints than that of σ
ph.
The Role of Clathrate Formation in Europa’s Ocean Composition
Authors: Bouquet Alexis , Mousis Olivier , Glein Christopher R. , Danger Grégoire , Waite J. Hunter 
Published: October 2019

Abstract
We use a thermodynamic statistical model to evaluate how the composition of Europa’s internal ocean may have been affected by clathrate hydrate formation. Assuming an input of the observed O2 and CO2 from the surface into a mildly acidic ocean (pH < 6), and considering the possibility of contributions by reduced (with CH4 and H2S) or oxidized (CO2-bearing) hydrothermal fluids, we calculate the fractional occupancies in clathrate and deduce the effect on the ocean’s composition. The structure of the clathrate formed, and therefore its density and composition is influenced by the relative amount of O2 compared to the other compounds present. We also include a mixture of noble gases—argon, krypton, and xenon—based on cometary abundances measured at comet 67P and find that the Ar/Kr ratio can be affected by almost two orders of magnitude. In most cases, the formed clathrate is likely to become part of the icy crust, with guest molecules possibly accessible to future in situ measurements by the Europa Clipper and JUICE missions.
HaloSat: A CubeSat to Study the Hot Galactic Halo
Authors: Kaaret P. , Zajczyk A. , LaRocca D. M. , Ringuette R. , Bluem J. , Fuelberth W. , Gulick H. , Jahoda K. , Johnson T. E. , Kirchner D. L. , Koutroumpa D. , Kuntz K. D. , McCurdy R. , Miles D. M. , Robison W. T. , Silich E. M. 
Published: October 2019

Abstract

HaloSat is a small satellite (CubeSat) designed to map soft X-ray oxygen line emission across the sky in order to constrain the mass and spatial distribution of hot gas in the Milky Way. The goal of HaloSat is to help determine if hot gas gravitationally bound to individual galaxies makes a significant contribution to the cosmological baryon budget. HaloSat was deployed from the International Space Station in 2018 July and began routine science operations in 2018 October. We describe the goals and design of the mission, the on-orbit performance of the science instrument, and initial observations.
Effect of Ionization and Recombination on the Evolution of the Harris-type Current Sheet in Partially Ionized Plasmas
Authors: Singh K. A. P. , Sakaue Takahito , Nakamura Naoki , Kawamura Akito D. , Isobe Hiroaki , Shibata Kazunari 
Published: October 2019

Abstract
Two-dimensional magnetohydrodynamics (MHD) simulations, treating plasma and neutral populations (hereafter, neutrals) as two separate components of the magneto-fluid, are performed in order to investigate the effect of ionization and recombination (or I/R) on the time evolution of the Harris-type current sheet in partially ionized plasmas. Our MHD simulations, including the effect of ambipolar diffusion (arising due to ion-neutral interactions) along with the I/R, show that the current sheet thinning occurs due to the diffusion of neutral particles from the current sheet. In addition to ambipolar diffusion, frictional heating also appears and affects the evolution of the current sheet. In a current sheet that is formed in a partially ionized plasma, the neutral population tries to spread outward and the plasma population tries to converge toward the center of the current sheet, and the overall process is influenced by the I/R. One of the important feature that is captured in our 2D simulations is that the escape of neutrals from the current sheet is sometimes suppressed due to the increase in ionization rate at the center of the current sheet, for the case of collisional I/R. As long as the ionization degree is kept low inside the current sheet, the current sheet thinning and elongation takes place and the current sheet becomes unstable due to the tearing-mode and plasmoid formation. The ion-neutral interactions coupled with I/R and the dynamics of the magnetic reconnection play an important role in plasmoid-mediated reconnection, therefore, the present study on the current sheet thinning and plasmoid formation could serve as a key for understanding bursty and intermittent plasma ejections observed in the solar chromosphere.
A Rapidly Declining Transient Discovered with the Subaru/Hyper Suprime-Cam
Authors: Tominaga Nozomu , Morokuma Tomoki , Tanaka Masaomi , Yasuda Naoki , Furusawa Hisanori , Tanaka Masayuki , Jiang Ji-an , Tolstov Alexey , Blinnikov Sergei , Doi Mamoru , Iwata Ikuru , Kuncarayakti Hanindyo , Moriya Takashi J. , Nagao Tohru , Nomoto Ken’ichi , Noumaru Junichi , Takata Tadafumi 
Published: October 2019

Abstract
We perform a high-cadence transient survey with the Subaru Hyper Suprime-Cam (HSC), which we call the Subaru HSC survey Optimized for Optical Transients (SHOOT). We conduct HSC imaging observations with time intervals of about one hour on two successive nights, and spectroscopic and photometric follow-up observations. A rapidly declining blue transient SHOOT14di at z = 0.4229 is found in observations on two successive nights using an image-subtraction technique. The rate of brightness change is

(

) in the observer (rest) frame and the rest-frame color between 3400 and 4400 Å is

. The nature of the object is investigated by comparing its peak luminosity, decline rate, and color with those of transients and variables previously observed, and with those of theoretical models. None of the transients or variables share the same properties as SHOOT14di. Comparisons with theoretical models demonstrate that, while the emission from the cooling envelope of a SN IIb shows a slower decline rate than SHOOT14di, and the explosion of a red supergiant star with a dense circumstellar wind shows a redder color than SHOOT14di, the shock breakout at the stellar surface of the explosion of a

red supergiant star with a small explosion energy of

erg reproduces the multicolor light curve of SHOOT14di. This discovery shows that a high-cadence, multicolor optical transient survey at intervals of about one hour, and continuous and immediate follow-up observations, is important for studies of normal core-collapse supernovae at high redshifts.
A Statistical Study of Solar Filament Eruptions that Form High-speed Coronal Mass Ejections
Authors: Zou Peng , Jiang Chaowei , Wei Fengsi , Zuo Pingbing , Wang Yi 
Published: October 2019

Abstract
Coronal mass ejections (CMEs) play a decisive role in driving space weather, especially the fast ones (e.g., with speeds above 800 km s−1). Understanding the trigger mechanisms of fast CMEs can help us gain important information in forecasting them. The filament eruptions accompanied with CMEs provide a good tracer in studying the early evolution of CMEs. Here we surveyed 66 filament-accompanied fast CMEs to analyze the correlation between the trigger mechanisms, namely either magnetic reconnection or ideal MHD process, associated flares, and CME speeds. Based on the data gathered from SDO, GONG, and STEREO, we find that (1) active region (AR) filament and intermediate filament (IF) eruptions show a higher probability for producing fast CMEs than quiet Sun (QS) filaments, while the probability of polar crown (PC) filament eruptions is zero in our statistic; (2) AR filament eruptions that produce fast CMEs are more likely to be triggered by magnetic reconnection, while QS filaments and IFs are more likely to be triggered by an ideal MHD process; (3) for AR filaments and IFs, it seems that the specific trigger mechanism does not have a significant influence on the resulting CME speeds, while for the QS filaments, the ideal MHD mechanism can more likely generate a faster CME; (4) comparing with previous statistical studies, the onset heights of filament eruptions and the decay indexes of the overlying field show some differences: for AR filaments and IFs, the decay indexes are larger and much closer to the theoretical threshold, while for QS filaments, the onset heights are higher than those obtained in previous results.
Kinetic Simulations of Nonrelativistic Perpendicular Shocks of Young Supernova Remnants. II. Influence of Shock-surfing Acceleration on Downstream Electron Spectra
Authors: Bohdan Artem , Niemiec Jacek , Pohl Martin , Matsumoto Yosuke , Amano Takanobu , Hoshino Masahiro 
Published: October 2019

Abstract
We explore electron preacceleration at high-Mach-number nonrelativistic perpendicular shocks at, e.g., young supernova remnants, which are a prerequisite of further acceleration to very high energies via diffusive shock acceleration. Using fully kinetic particle-in-cell simulations of shocks and electron dynamics in them, we investigate the influence of shock-surfing acceleration (SSA) at the shock foot on the nonthermal population of electrons downstream of the shock. The SSA is followed by further energization at the shock ramp where the Weibel instability spawns a type of second-order Fermi acceleration. The combination of these two processes leads to the formation of a nonthermal electron population, but the importance of SSA becomes smaller for larger ion-to-electron mass ratios in the simulation. We discuss the resulting electron spectra and the relevance of our results to the physics of systems with real ion-to-electron mass ratios and fully three-dimensional behavior.
Discovery of a Dark, Massive, ALMA-only Galaxy at z ∼ 5–6 in a Tiny 3 mm Survey
Authors: Williams Christina C. , Labbe Ivo , Spilker Justin , Stefanon Mauro , Leja Joel , Whitaker Katherine , Bezanson Rachel , Narayanan Desika , Oesch Pascal , Weiner Benjamin 
Published: October 2019

Abstract
We report the serendipitous detection of two 3 mm continuum sources found in deep ALMA Band 3 observations to study intermediate-redshift galaxies in the COSMOS field. One is near a foreground galaxy at 1.″3, but is a previously unknown dust-obscured star-forming galaxy (DSFG) at probable z
CO = 3.329, illustrating the risk of misidentifying shorter wavelength counterparts. The optical-to-millimeter spectral energy distribution (SED) favors a gray λ
−0.4 attenuation curve and results in significantly larger stellar mass and SFR compared to a Calzetti starburst law, suggesting caution when relating progenitors and descendants based on these quantities. The other source is missing from all previous optical/near-infrared/submillimeter/radio catalogs (“ALMA-only”), and remains undetected even in stacked ultradeep optical (>29.6 AB) and near-infrared (>27.9 AB) images. Using the ALMA position as a prior reveals faint signal-to-noise ratio ∼ 3 measurements in stacked IRAC 3.6+4.5, ultradeep SCUBA2 850 μm, and VLA 3 GHz, indicating the source is real. The SED is robustly reproduced by a massive M* = 1010.8
M
⊙ and M
gas = 1011
M
⊙, highly obscured A

V
∼ 4, star-forming SFR ∼ 300 M
⊙ yr−1 galaxy at redshift z = 5.5 ± 1.1. The ultrasmall 8 arcmin2 survey area implies a large yet uncertain contribution to the cosmic star formation rate density CSFRD(z = 5) ∼ 0.9 × 10−2
M
⊙ yr−1 Mpc−3, comparable to all ultraviolet-selected galaxies combined. These results indicate the existence of a prominent population of DSFGs at z > 4, below the typical detection limit of bright galaxies found in single-dish submillimeter surveys, but with larger space densities ∼3 × 10−5 Mpc−3, higher duty cycles of 50%–100%, contributing more to the CSFRD, and potentially dominating the high-mass galaxy stellar mass function.
Dust Polarization toward Embedded Protostars in Ophiuchus with ALMA. III. Survey Overview
Authors: Sadavoy Sarah I. , Stephens Ian W. , Myers Philip C. , Looney Leslie , Tobin John , Kwon Woojin , Commerçon Benoît , Segura-Cox Dominique , Henning Thomas , Hennebelle Patrick 
Published: October 2019

Abstract
We present 0.″25 resolution (35 au) ALMA 1.3 mm dust polarization observations for 37 young stellar objects (YSOs) in the Ophiuchus molecular cloud. These data encompass all the embedded protostars in the cloud and several flat-spectrum and Class II objects to produce the largest, homogeneous study of dust polarization on disk scales to date. The goal of this study is to study dust polarization morphologies down to disk scales. We find that 14/37 (38%) of the observed YSOs are detected in polarization at our sensitivity. Nine of these sources have uniform polarization angles, and four sources have azimuthal polarization structure. We find that the sources with uniform polarization tend to have steeper inclinations (>60°) than those with azimuthal polarization (<60°). Overall, the majority (9/14) of the detected sources have polarization morphologies and disk properties consistent with dust self-scattering processes in optically thick disks. The remaining sources may be instead tracing magnetic fields. Their inferred field directions from rotating the polarization vectors by 90° are mainly poloidal or hourglass shaped. We find no evidence of a strong toroidal field component toward any of our disks. For the 23 YSOs that are undetected in polarization, roughly half of them have 3σ upper limits of <2%. These sources also tend to have inclinations <60°, and they are generally compact. Since lower-inclination sources tend to have azimuthal polarization, these YSOs may be undetected in polarization owing to unresolved polarization structure within our beam. We propose that disks with inclinations >60° are the best candidates for future polarization studies of dust self-scattering, as these systems will generally show uniform polarization vectors that do not require very high resolution to resolve. We release the continuum and polarization images for all the sources with this publication. Data from the entire survey can be obtained from Dataverse.
Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-Ray Afterglow
Authors: Tang Chen-Han , Huang Yong-Feng , Geng Jin-Jun , Zhang Zhi-Bin 
Published: October 2019

Abstract
A plateau phase in the X-ray afterglow is observed in a significant fraction of gamma-ray bursts (GRBs). Previously, a correlation among three key parameters concerning the plateau phase is found to exist, i.e., the end time of the plateau phase in the GRB rest frame (T

a
), the corresponding X-ray luminosity at the end time (L
X) and the isotropic energy of the prompt GRB (E

γ,iso). In this study, we systematically search through all the Swift GRBs with a plateau phase that occurred between 2005 May and 2018 August. We collect 174 GRBs, with redshifts available for all of them. For the whole sample, the correlation between L
X, T

a
, and E

γ,iso is confirmed, with the best-fit relation being

. Such an updated three-parameter correlation still supports that the central leftover after GRBs is probably a millisecond magnetar. Note that short GRBs with durations less than 2 s in our sample also follow the same correlation, which hints that the merger production of two neutron stars could be a high-mass magnetar but not necessarily a black hole. Moreover, GRBs with an “internal” plateau (i.e., with a following decay index being generally smaller than −3) also obey this correlation. It further strengthens the idea that the internal plateau is due to the delayed collapse of a high-mass neutron star into a black hole. The updated three-parameter correlation indicates that GRBs with a plateau phase may act as a standard candle for cosmology study.
Is Automotive Leasing a Risky Business?
Authors: Schmit Mathias 
Published: October 2019

Résumé Cet article se consacre à la question de la modélisation du risque de crédit pour les portefeuilles de crédit-bail automobile. Il expose les résultats relatifs aux performances des contrats de crédit-bail en termes de probabilité de défaut et de perte en cas de défaillance, et propose des solutions spécifiques tenant compte des caractéristiques les plus saillantes de ces portefeuilles : leur grande taille, le fait que la propriété des actifs reste aux bailleurs et le niveau limité d’informations disponibles quant à la situation financière des locataires. La fonction de densité des probabilités de pertes et les mesures VaR sont estimées grâce à une base de données privée comprenant un ensemble unique de 35.861 contrats de crédit-bail automobiles émis entre 1990 et 2000 par une importante institution financière européenne. Les résultats montrent que les taux de recouvrement observés dans l’industrie du crédit-bail automobile sont élevés et confirment le fait que cette activité est relativement peu risquée. Une comparaison avec des exigences en capital telles que dictées par la proposition du Comité de Bâle montre également qu’une plus large reconnaissance des collatéraux physiques sous Bâle II permettrait non seulement de mieux refléter le profil de risque des contrats de crédit-bail automobiles mais aussi de réduire l’écart significatif qui existe entre les exigences en capital des différentes approches de l’accord-cadre proposé par le Comité de Bâle.
La dynamique de la volatilité à très haute fréquence des taux longs euro
Authors: Lespagnol Charlotte , Teiletche Jérôme 
Published: October 2019

Résumé L’objet de ce texte est d’analyser la dynamique de la volatilité des taux longs européens à différentes fréquences (intra-journaliers, quotidiens). Nous identifions et quantifions l’ampleur des différentes composantes de la volatilité : mémoire longue et effet ARCH, effets saisonniers, annonces de nouvelles économiques. Parmi ces dernières, nous mettons notamment en évidence le rôle joué par le rapport sur l’emploi américain et les annonces de la BCE. L’analyse est basée sur près de deux ans d’observations du contrat Euro Notionnel, échantillonnées toutes les cinq minutes. La comparaison des résultats avec ceux obtenus sur le contrat Euro Bund montre leur absence de dépendance aux problèmes concurrentiels du MATIF face à l’EUREX.
Le Carnet d'Ordres : une revue de littérature
Authors: Moinas Sophie 
Published: October 2019

Résumé On assiste depuis quelques années à une prolifération des carnets d’ordres électroniques. Ce développement, d’un intérêt considérable, a soulevé de nombreuses questions concernant ce type de marchés dits « dirigés par les ordres ». La réponse à ces questions est importante à la fois pour les autorités de marché, qui cherchent à organiser le marché de manière optimale, et pour les praticiens, qui recherchent des stratégies d’investissement à moindre coût. Afin de comprendre les enjeux liés à ces questions, nous proposons une revue de littérature qui présente le fonctionnement du marché dirigé par les ordres et ses caractéristiques, et en analyse la perfomance.