bluuebunny/crossref_metadata_2025_split huggingface dataset:
UPAYA PENINGKATAN KEMAMPUAN SISWA DALAM READING COMPREHENSION PADA TEXT REPORT MELALUI PEDEKATAN SCIENTIFIC DI KELAS XI-MIA.5 SMAN 2 BANGKINANG KOTA TP 2016-2017
Authors: Maznum Maznum 
Published: March 2018

Banyaknya jumlah jenis bacaan atau teks yang akan ditemukan dalam pembelajaran maka penulis memfokuskan pada satu teks yang akan penulis teliti yaitu : “ Reading Factual REPORT”. Penulis mengambil teks ini karena berdasarkan hasil test ulangan harian beberapa kelas di semester tahun sebelum penulisan penelitian ini ditemukan lebih dari 50 % siswa mendapat kan nilai di bawah standart KKM sekolah yaitu 70. Oleh karena itu maka disini penulis mempunyai satu permasalahan terhadap Kompetensi Dasar (KD) dalam unit ini yaitu ( KD. 4.7 ) : Menanggap makna dalam taxt ilmiah factual (factual report) lisan dan tulis, tentang orang, binantang, benda, gejala dan peristiwa alam dan sosial , terkait dengan mata pelajaran lain di kelas XI. Penerapan pembelajran dengan Pendekatan Scientific memiliki pengaruh positif dalam meningkatkan hasil belajar siswa yang ditandai dengan peningkatan ketuntasan belajar siswa dalam setiap siklus, yaitu Siklus I 64.52 % menjadi 83.87 % pada Siklus II. Pembelajaran dengan Pendekatan Scientific dapat meningkatkan motivasi belajar siswa dalam pembelajaran Bahasa Inggris . Ini ditunjukkan dengan keaktifan siswa selama dalam prosese pembelajaran berlansung. Penggunaan media Laptop dan tayangan LCD memacu antusias siswa dalam berdiskusi ketikaka proses langkah Mengamati, dan Menanya.
PENGGUNAAN MEDIA BAGAN DENGAN IRAMA LAGU UNTUK MENINGKATKAN HASIL BELAJAR SISWA PADA MATERI METABOLISMEDI KELAS XII MIA5 SMAN 2 BANGKINANG KOTA
Authors: Masni Tuti 
Published: March 2018

Penelitian ini dilatar belakangi oleh pengalaman penulis dan obervasi selama mengajar, bahwa materi Metabolisme cukup sulit untuk dipahami dan dihafal siswa karena berkaitan dengan reaksi kimia dalam tubuh. Hal ini dibuktikan dengan rendahnyan nilai hasil belajar siswa. Penelitian ini bertujuan untuk meningkatkan aktivitas dan hasil belajar siswa dan dapat dijadikan sebagai salah satu alternatif bagi guru untuk memperbaiki proses pembelajaran dalam meningkatkan hasil belajar siswa. Penelitian ini merupakan Penelitian Tindakan Kelas. Penelitian ini dilaksanakan di SMAN 2 Bangkinang Kota,pada semester ganjil tahun pelajaran 2017/2018 pada bulan Agustus dan September pada materi Metabolisme (KD.3.2). Adapun Subyek penelitian ini adalah siswa kelas XII MIA 5 yang berjumlah 29 orang. Siswa laki-laki berjumlah 11 orang dan siswa perempuan berjumlah 18 orang. Penelitian ini dilakukan sebanyak 2 siklus (Siklus I dan II) dan pada masing-masing Siklus terdiri dari 4 tahap,yaitu Perencanaan,tindakan,observasi dan refleksi.Hasil penelitian membuktikan adanya peningkatan aktifitas belajar siswa dan hasil belajar siswa.Pada Siklus I jumlah siswa yang tuntas 23 orang (79%) dan jumlah siswa tidak tuntas 6 orang(21%)dan daya serap 77,8% dengan kategori Cukup Baik sedangkan pada Siklus II meningkat yaitu : jumlah siswa yang tuntas 26 orang ( 89,6 %) dan tidak tuntas 3 orang (10,4%) dan daya serap 86,4% dengan kategori Amat Baik.
Reduced Cerebrovascular Reserve Capacity as a Biomarker of Microangiopathy in Alzheimer’s Disease and Mild Cognitive Impairment
Authors: Urbanova Barbora Soukupova , Schwabova Jaroslava Paulasova , Magerova Hana , Jansky Petr , Markova Hana , Vyhnalek Martin , Laczo Jan , Hort Jakub , Tomek Ales 
Published: March 2018

Background: Cerebral microangiopathy in Alzheimer’s disease (AD) causes chronic hypoperfusion and probably accelerates neurodegenerative changes. Objective: We hypothesize microvascular impairment could be present already in mild cognitive impairment (MCI) and can be revealed using transcranial color-coded sonography (TCCS) and the breath-holding maneuver. Methods: Three groups of subjects (AD in the stage of dementia, MCI, and cognitively normal controls) with detailed neuropsychological testing and low cerebrovascular burden (no history of stroke, no intra- or extracranial artery stenoses, and no severe vascular lesions on brain MRI), underwent a TCCS assessment of peak systolic (PSV), mean flow (MFV), and end diastolic velocities (EDV) and resistance and pulsatility indices (RI, PI) in large intracranial vessels bilaterally. Cerebrovascular reserve capacity was assessed using the breath-holding index (BHI) in middle cerebral artery (MCA) bilaterally. The ultrasound parameters were compared between the groups, correlated with neuropsychological tests, and compared between amnestic and non-amnestic MCI subtypes. Results: Fourteen AD (3 males, 67.9±11.1 years, MMSE 18.0±4.6), 24 MCI (13 males, 71.9±7.3 years, MMSE 28.0±1.6), and 24 risk factor-matched controls (14 males, 67.8±6.4 years, MMSE 29.1±1.2) were enrolled. Significant differences were found between AD and controls in MFV, EDV, RI, PI in right MCA after breath holding, in PSV, MFV, EDV in left MCA after breath holding, and in BHI on the left side. The left BHI correlated positively with verbal memory test. Conclusion: Results show decreased cerebrovascular reserve capacity in AD as a sign of impaired cerebral hemodynamic status without severe underlying atherosclerosis. This can be identified using TCCS and BHI.
Possible Presence of a Third Body in the Kepler K2 Variable EPIC 202073314
Authors: Sriram K. , Malu S. , Choi C. S. , Rao P. Vivekananda 
Published: March 2018

Abstract
We report the presence of an unseen third-body companion in a low-mass-ratio deep contact binary system Kepler K2 EPIC 202073314 as seen by the presence of the light time effect (LITE) on the O–C diagram. The system is found to be exhibiting an increasing period trend along with a sinusoidal behavior of the O–C residuals owing to the LITE variations. The residuals are modeled initially assuming a circular orbit to obtain a third-body orbital period of ∼9.75 years. We further performed a rigorous analysis by allowing the eccentricity to vary, which led to a third-body orbital period of ∼8.66 years with e
3 = 0.51. We also report the photometric study of this variable. The system is found to have a mass ratio of ∼0.15 with an inclination of ∼77°. Monte-Carlo simulations were performed to verify the consistency of the obtained photometric solution. The system is considered to be in significant geometrical contact as seen by the high fill-out factor of ∼57%. Magnetic inactivity of the system is understood in terms of the absence of O’ Connell effect and lack of fill-in effect in the Hα spectral line. The dynamical state of the system is discussed in terms of the Hut’s stability criteria (

) as the low-mass and high fill-out factor configuration of the system makes it a promising candidate in the context of stellar mergers. Assuming conservative mass transfer, the system is expected to meet the critical mass ratio of ∼0.07–0.09 in ∼106 years.
Radial Velocities of RR Lyrae Stars in and around NGC 6441
Authors: Kunder Andrea , Mills Arthur , Edgecomb Joseph , Thomas Mathew , Schilter Levi , Boyle Craig , Parker Stephen , Bellevue Gordon , Rich R. Michael , Koch Andreas , Johnson Christian I. , Nataf David M. 
Published: March 2018

Abstract
Detailed elemental abundance patterns of metal-poor ([Fe/H] ∼ −1 dex) stars in the Galactic bulge indicate that a number of them are consistent with globular cluster (GC) stars and may be former members of dissolved GCs. This would indicate that a few per cent of the Galactic bulge was built up from destruction and/or evaporation of GCs. Here, an attempt is made to identify such presumptive stripped stars originating from the massive, inner Galaxy GC NGC 6441 using its rich RR Lyrae variable star (RRL) population. We present radial velocities of 40 RRLs centered on the GC NGC 6441. All 13 of the RRLs observed within the cluster tidal radius have velocities consistent with cluster membership, with an average radial velocity of 24 ± 5 km s−1 and a star-to-star scatter of 11 km s−1. This includes two new RRLs that were previously not associated with the cluster. Eight RRLs with radial velocities consistent with cluster membership but up to three time the distance from the tidal radius are also reported. These potential extra-tidal RRLs also have exceptionally long periods, which is a curious characteristic of the NGC 6441 RRL population that hosts RRLs with periods longer than seen anywhere else in the Milky Way. As expected of stripped cluster stars, most are inline with the cluster’s orbit. Therefore, either the tidal radius of NGC 6441 is underestimated and/or we are seeing dissolving cluster stars stemming from NGC 6441 that are building up the old spheroidal bulge.
Fine Structures of Solar Radio Type III Bursts and Their Possible Relationship with Coronal Density Turbulence
Authors: Chen Xingyao , Kontar Eduard P. , Yu Sijie , Yan Yihua , Huang Jing , Tan Baolin 
Published: March 2018

Abstract
Solar radio type III bursts are believed to be the most sensitive signatures of near-relativistic electron beam propagation in the corona. A solar radio type IIIb-III pair burst with fine frequency structures, observed by the Low Frequency Array (LOFAR) with high temporal (∼10 ms) and spectral (12.5 kHz) resolutions at 30–80 MHz, is presented. The observations show that the type III burst consists of many striae, which have a frequency scale of about 0.1 MHz in both the fundamental (plasma) and the harmonic (double plasma) emission. We investigate the effects of background density fluctuations based on the observation of striae structure to estimate the density perturbation in the solar corona. It is found that the spectral index of the density fluctuation spectrum is about −1.7, and the characteristic spatial scale of the density perturbation is around 700 km. This spectral index is very close to a Kolmogorov turbulence spectral index of −5/3, consistent with a turbulent cascade. This fact indicates that the coronal turbulence may play the important role of modulating the time structures of solar radio type III bursts, and the fine structure of radio type III bursts could provide a useful and unique tool to diagnose the turbulence in the solar corona.
Unlocking CO Depletion in Protoplanetary Disks. I. The Warm Molecular Layer
Authors: Schwarz Kamber R. , Bergin Edwin A. , Cleeves L. Ilsedore , Zhang Ke , Öberg Karin I. , Blake Geoffrey A. , Anderson Dana 
Published: March 2018

Abstract
CO is commonly used as a tracer of the total gas mass in both the interstellar medium and in protoplanetary disks. Recently, there has been much debate about the utility of CO as a mass tracer in disks. Observations of CO in protoplanetary disks reveal a range of CO abundances, with measurements of low CO to dust mass ratios in numerous systems. One possibility is that carbon is removed from CO via chemistry. However, the full range of physical conditions conducive to this chemical reprocessing is not well understood. We perform a systematic survey of the time dependent chemistry in protoplanetary disks for 198 models with a range of physical conditions. We vary dust grain size distribution, temperature, comic-ray and X-ray ionization rates, disk mass, and initial water abundance, detailing what physical conditions are necessary to activate the various CO depletion mechanisms in the warm molecular layer. We focus our analysis on the warm molecular layer in two regions: the outer disk (100 au) well outside the CO snowline and the inner disk (19 au) just inside the midplane CO snowline. After 1 Myr, we find that the majority of models have a CO abundance relative to H2 less than 10−4 in the outer disk, while an abundance less than 10−5 requires the presence of cosmic-rays. Inside the CO snowline, significant depletion of CO only occurs in models with a high cosmic-ray rate. If cosmic-rays are not present in young disks, it is difficult to chemically remove carbon from CO. Additionally, removing water prior to CO depletion impedes the chemical processing of CO. Chemical processing alone cannot explain current observations of low CO abundances. Other mechanisms must also be involved.
The Next Generation Virgo Cluster Survey (NGVS). XXXII. A Search for Globular Cluster Substructures in the Virgo Galaxy Cluster Core
Authors: Powalka Mathieu , Puzia Thomas H. , Lançon Ariane , Longobardi Alessia , Peng Eric W. , Duc Pierre-Alain , Alamo-Martínez Karla , Blakeslee John P. , Côté Patrick , Cuillandre Jean-Charles , Durrell Patrick , Eigenthaler Paul , Ferrarese Laura , Guhathakurta Puragra , Gwyn S. D. J. , Hudelot Patrick , Liu Chengze , Mei Simona , Muñoz Roberto P. , Roediger Joel , Sánchez-Janssen Rubén , Toloba Elisa , Zhang Hongxin 
Published: March 2018

Abstract
Substructure in globular cluster (GC) populations around large galaxies is expected in galaxy formation scenarios that involve accretion or merger events, and it has been searched for using direct associations between GCs and structure in the diffuse galaxy light, or with GC kinematics. Here, we present a search for candidate substructures in the GC population around the Virgo cD galaxy M87 through the analysis of the spatial distribution of the GC colors. The study is based on a sample of ∼1800 bright GCs with high-quality u, g, r, i, z, K

s
photometry, selected to ensure a low contamination by foreground stars or background galaxies. The spectral energy distributions of the GCs are associated with formal estimates of age and metallicity, which are representative of its position in a 4D color space relative to standard single stellar population models. Dividing the sample into broad bins based on the relative formal ages, we observe inhomogeneities that reveal signatures of GC substructures. The most significant of these is a spatial overdensity of GCs with relatively young age labels, of diameter ∼0.°1 (∼30 kpc), located to the south of M87. The significance of this detection is larger than about 5σ after accounting for estimates of random and systematic errors. Surprisingly, no large Virgo galaxy is present in this area that could potentially host these GCs. But candidate substructures in the M87 halo with equally elusive hosts have been described based on kinematic studies in the past. The number of GC spectra available around M87 is currently insufficient to clarify the nature of the new candidate substructure.
A Chandra Study of the Stellar X-Ray Emissivity of Globular Clusters in the M31 Bulge
Authors: Xu Xiao-jie , Li Zhiyuan 
Published: March 2018

Abstract
The X-ray emissivity (i.e., luminosity per unit stellar mass) of globular clusters (GCs) is an important indicator of their dynamical evolution history. Based on deep archival Chandra observations, we report a stacking analysis of 44 GCs with 0.5–8 keV luminosities L
X ≲ 1035 erg s−1 in the M31 bulge, which are supposed to be dominated by cataclysmic variables (CVs) and coronally active binaries (ABs). We obtain a significant detection at the 5σ level in 0.5–8 keV band. The average X-ray luminosity per GC and the average X-ray emissivity are determined to be 5.3 ± 1.6 × 1033 erg s−1 and 13.2 ± 4.3 × 1027 erg s−1

, respectively. Both of these values are consistent with those of Milky Way GCs. Moreover, the measured emissivity of M31 GCs is also consistent with that of the Milky Way field stars. Massive GCs have X-ray luminosities that are marginally higher than those of less massive ones. Massive GCs also show a lower emissivity (

) than less massive ones (

), which is consistent with the scenario that the (progenitors of) CVs and ABs were more efficiently destroyed via stellar encounters in the more massive GCs. No dependence of the X-ray emissivity on GC color or on the projected galactocentric distance of GCs is found.
Demonstration of a Novel Method for Measuring Mass-loss Rates for Massive Stars
Authors: Kobulnicky Henry A. , Chick William T. , Povich Matthew S. 
Published: March 2018

Abstract
The rate at which massive stars eject mass in stellar winds significantly influences their evolutionary path. Cosmic rates of nucleosynthesis, explosive stellar phenomena, and compact object genesis depend on this poorly known facet of stellar evolution. We employ an unexploited observational technique for measuring the mass-loss rates of O and early-B stars. Our approach, which has no adjustable parameters, uses the principle of pressure equilibrium between the stellar wind and the ambient interstellar medium for a high-velocity star generating an infrared bow shock nebula. Results for 20 bow-shock-generating stars show good agreement with two sets of theoretical predictions for O5–O9.5 main-sequence stars, yielding

= 1.3 × 10−6 to 2 × 10−9

. Although

values derived for this sample are smaller than theoretical expectations by a factor of about two, this discrepancy is greatly reduced compared to canonical mass-loss methods. Bow-shock-derived mass-loss rates are factors of 10 smaller than Hα-based measurements (uncorrected for clumping) for similar stellar types and are nearly an order of magnitude larger than P4+ and some other diagnostics based on UV absorption lines. Ambient interstellar densities of at least several cm−3 appear to be required for formation of a prominent infrared bow shock nebula. Measurements of

for early-B stars are not yet compelling owing to the small number in our sample and the lack of clear theoretical predictions in the regime of lower stellar luminosities. These results may constitute a partial resolution of the extant “weak-wind problem” for late-O stars. The technique shows promise for determining mass-loss rates in the weak-wind regime.
Associations d’usagers et sclérose en plaques : impact du néolibéralisme en France sur les trajectoires de vie des patients
Authors: Colinet Séverine 
Published: March 2018

Introduction : La sclérose en plaques est une maladie neurologique qui entraîne une limitation des performances corporelles. Ses impacts sur la vie sociale et professionnelle des personnes atteintes sont majeurs car, les symptômes restant souvent invisibles, les incapacités du malade suscitent l’incompréhension dans une société marquée par le dogme néolibéral de la performance. L’engagement associatif constitue alors fréquemment pour les malades un support à leur trajectoire. Objectif : L’objectif de cette recherche était d’identifier comment se manifestent les principes du néolibéralisme dans les discours des sujets atteints de sclérose en plaques, de comprendre les effets induits par l’intégration du néolibéralisme, et de préciser le rôle joué par l’engagement associatif dans les trajectoires de vie. Méthodes : Il s’agissait d’une étude qualitative : 30 entretiens individuels et quatre entretiens collectifs ont été réalisés avec des patients, ainsi que 23 observations de réunions et de groupes de réflexion d’associations de patients. Dix personnes rencontrées en entretien ont par ailleurs rédigé un mini-journal ayant pour objet une restitution quotidienne de leur action associative. Les données ont été analysées thématiquement, indépendamment dans un premier temps, de manière croisée ensuite. Le Logiciel AtlasTi a été utilisé. Résultats : L’association constitue sous deux formes, pratique et idéologique, une illustration de la résistance au néolibéralisme, notamment au travers des prises de responsabilités individuelles et collectives. Toutefois, elle recrée dans une certaine mesure des espaces de performance. Conclusion : Sur le plan pratique, cette recherche vient réaffirmer la nécessité de créer des activités collectives pour accompagner les sujets atteints de maladie chronique.
Le bénéfice du tiers dans le « travail d’organisation » des cadres de santé
Authors: Dujardin Pierre-Philippe , Valette Annick , Reverdy Thomas , François Patrice 
Published: March 2018

L’organisation de la production de soins peut être considérée comme un travail d’organisation (TO) décomposé en trois niveaux, opérationnel, organisationnel et d’apprentissage. Le TO du cadre de santé (CdS) se concentre souvent au niveau opérationnel, au détriment des deux autres niveaux. Cette difficulté vient de l’organisation qui présente une rationalité politique, cognitive et pragmatique limitée. L’objectif de l’étude est d’identifier l’impact d’un tiers sur l’organisation et l’effet sur le TO du CdS. Un dispositif pédagogique met des étudiants cadres en position de tiers pour travailler un problème organisationnel délégué par un CdS. La recherche-intervention a suivi 17 projets sur une année. L’action de ces tiers a permis de légitimer le problème, reconnaître les difficultés des soignants, reconfigurer les relations dans une dimension politique. Les méthodes employées par le tiers ont réassuré le CdS et complété ses connaissances. Pour les CdS, les apprentissages de la démarche concernaient la méthodologie et la posture managériale. En pratique, le tiers a relancé le CdS dans son pouvoir d’agir et a synchronisé les interrelations autour du TO. Le tiers aide pour développer le TO et combler certaines limites de la rationalité politique, cognitive et pragmatique. Les difficultés à faire évoluer les pratiques au-delà de l’équipe soignante limite toutefois la portée de l’action. Il est préconisé une unité de soutien managérial pour apporter la structure et l’accompagnement au TO, de mettre à l’agenda collectif le TO et de développer des espaces de discussion sur le TO.
The Increasing Burden of Atrial Fibrillation in Acute Medical Admissions, An Opportunity to Optimise Stroke Prevention
Authors: Induruwa I , Amis E , Hannon N , Khadjooi K 
Published: March 2018

Background Atrial fibrillation is a major risk factor for ischaemic stroke. We investigated whether active screening for atrial fibrillation in secondary care, followed by careful evaluation of risk factors and communication to general practitioners from stroke specialists, could increase appropriate anticoagulation prescription. Methods Between 1/9/14 and 28/2/15 all acute medical admissions were screened for atrial fibrillation at Cambridge University Hospital. Individualised letters were sent to the general practitioners of patients who it was felt would benefit from anticoagulation. Results In total, 847 patients with atrial fibrillation (15% prevalence, 52% female, median age 81.9 years, median CHA2DS2-VASc 4.4) were identified; 671 (79.2%) had known atrial fibrillation, and 176 (20.8%) were diagnosed on admission. After screening and identifying ‘at risk’ patients, 112 individualised letters were sent to GPs. A 91% response rate was achieved, resulting in an additional 43 individuals being appropriately anticoagulated. Conclusions Atrial fibrillation prevalence is significantly increasing among acute hospital admissions; these patients have high risk of cardioembolic stroke. Careful screening and identification in secondary care can lead to improved rates of anticoagulation.