bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Population of Pulsating Variable Stars in the Sextans Dwarf Spheroidal Galaxy
Authors: Vivas A. Katherina , Alonso-García Javier , Mateo Mario , Walker Alistair , Howard Brittany 
Published: January 2019

Abstract
A large extension of the Sextans dwarf spheroidal galaxy, 7 deg2, has been surveyed for variable stars using the Dark Energy Camera at the Blanco Telescope at Cerro Tololo Inter-American Observatory, Chile. We report seven anomalous Cepheids, 199 RR Lyrae stars, and 16 dwarf Cepheids in the field. This is only the fifth extragalactic system in which dwarf Cepheids have been systematically searched. Henceforth, the new stars increase the census of stars coming from different environments that can be used to asses the advantages and limitations of using dwarf Cepheids as standard candles in populations for which the metallicity is not necessarily known. The dwarf Cepheids found in Sextans have a mean period of 0.066 day and a mean g amplitude of 0.87 mag. They are located below the horizontal branch, spanning a range of 0.8 mag: 21.9 < g < 22.7. The number of dwarf Cepheids in Sextans is low compared with other galaxies such as Carina, which has a strong intermediate-age population. On the other hand, the number and ratio of RR Lyrae stars to dwarf Cepheids are quite similar to those of Sculptor, a galaxy which, as Sextans, is dominated by an old stellar population. The dwarf Cepheid stars found in Sextans follow a well-constrained period–luminosity relationship with an rms = 0.05 mag in the g band, which was set up by anchoring to the distance modulus given by the RR Lyrae stars. Although the majority of the variable stars in Sextans are located toward the center of the galaxy, we have found two RR Lyrae stars and one anomalous Cepheid in the outskirts of the galaxy that may be extratidal stars and suggest that this galaxy may be undergoing tidal destruction. These possible extratidal variable stars share the same proper motions as Sextans, as seen by recent Gaia measurements. Two additional stars that we initially classified as foreground RR Lyrae stars may actually be other examples of Sextans extratidal anomalous Cepheids, although radial velocities are needed to prove that scenario.
Scale-dependent Polarization of Solar Wind Velocity Fluctuations at the Inertial and Kinetic Scales
Authors: Šafránková Jana , Němeček Zdeněk , Němec František , Verscharen Daniel , Chen Christopher H. K. , Ďurovcová Tereza , Riazantseva Maria O. 
Published: January 2019

Abstract
We study the polarization properties of the velocity fluctuations in solar wind turbulence using high-resolution data from the Spektr-R spacecraft. The ratio of perpendicular to parallel velocity fluctuations in the inertial range is smaller than the equivalent ratio for magnetic fluctuations, but gradually increases throughout this range. In the kinetic range, there is a large decrease in the ratio, similar to the magnetic fluctuations. We compare the measurements to numerical solutions for a combination of kinetic Alfvén waves and slow waves, finding that both the slow increase and sharp decrease in the ratio are consistent with a majority population of Alfvén waves and minority population of slow waves in critical balance. Furthermore, the beta-dependence of this scale-dependent ratio can be successfully captured in the model when incorporating a beta-dependent Alfvén to slow wave ratio similar to that observed in the solar wind.
The Spitzer-HETDEX Exploratory Large Area Survey. II. The Dark Energy Camera and Spitzer/IRAC Multiwavelength Catalog
Authors: Wold Isak G. B. , Kawinwanichakij Lalitwadee , Stevans Matthew L. , Finkelstein Steven L. , Papovich Casey , Devarakonda Yaswant , Ciardullo Robin , Feldmeier John , Florez Jonathan , Gawiser Eric , Gronwall Caryl , Jogee Shardha , Marshall Jennifer L. , Sherman Sydney , Shipley Heath V. , Somerville Rachel S. , Valdes Francisco , Zeimann Gregory R. 
Published: January 2019

Abstract
We present the ugriz-band Dark Energy Camera (DECam) plus 3.6 and 4.5 μm IRAC catalogs for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers ∼24 deg2 of the Sloan Digital Sky Survey (SDSS) “Stripe 82” region, with seven bandpasses spanning a wavelength range of 0.35 to 4.5 μm. SHELA falls within the footprint of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX), which will provide spectroscopic redshifts for ∼200,000 Lyα emitters at 1.9 < z < 3.5 and also for ∼200,000 [O ii] emitters at z < 0.5. SHELA’s deep, wide-area multiwavelength images, combined with HETDEX’s spectroscopic information, will facilitate many extragalactic studies, including measuring the evolution of galaxy stellar mass, halo mass, and environment from 1.5 < z < 3.5. Here we present riz-band-selected ugriz-band DECam catalogs that reach a 5σ depth of ∼24.5 AB mag (for point sources with an aperture that encloses 70% of the total flux) and cover 17.5 deg2 of the overall SHELA field. We validate our DECam catalog by comparison to the DECam Legacy Survey (DECaLS) DR5 and the Dark Energy Survey (DES) DR1. We perform IRAC forced photometry with The Tractor image modeling code to measure 3.6 and 4.5 μm fluxes for all objects within our DECam catalog. We demonstrate the utility of our catalog by computing galaxy number counts and estimating photometric redshifts. Our photometric redshifts recover the available

SDSS spectroscopic redshifts with a 1σ scatter in Δz/(1 + z) of 0.04.
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: The Fourth and Fifth Data Releases
Authors: Yao Su , Wu Xue-Bing , Ai Y. L. , Yang Jinyi , Yang Qian , Dong Xiaoyi , Joshi Ravi , Wang Feige , Feng Xiaotong , Fu Yuming , Hou Wen , Luo A.-L. , Kong Xiao , Liu Yuanqi , Zhao Y.-H. , Zhang Y.-X. , Yuan H.-L. , Shen Shiyin 
Published: January 2019

Abstract
We present Data Releases 4 and 5 of the quasar catalog from the quasar survey by the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST), which includes quasars observed between 2015 September and 2017 June. There are a total of 19,253 quasars identified by visual inspections of the spectra. Among them, 11,458 were independently discovered by LAMOST, in which 3296 were reported by the SDSS DR12 and DR14 quasar catalog after our survey began, while the remaining 8162 are new discoveries of LAMOST. We provide the emission line measurements for Hα, Hβ, Mg ii, and/or C iv for 18,100 quasars. Since LAMOST does not have absolute flux calibration information, we obtain the monochromatic continuum luminosities by fitting the SDSS photometric data using the quasar spectra, and then estimate the black hole masses. The catalog and spectra for these quasars are available online. This is the third installment in the series of LAMOST quasar surveys that has released spectra for ∼43,000 quasars to date. There are 24,772 independently discovered quasars, 17,128 of which are newly discovered. In addition to this great supplement to the new quasar discoveries, LAMOST has also provided a large database (overlapped with SDSS) for investigating quasar spectral variability and discovering unusual quasars, including changing-look quasars, with ongoing and upcoming large surveys.
SOFIA Far-infrared Imaging Polarimetry of M82 and NGC 253: Exploring the Supergalactic Wind
Authors: Jones Terry Jay , Dowell C. Darren , Rodriguez Enrique Lopez , Zweibel Ellen G. , Berthoud Marc , Chuss David T. , Goldsmith Paul F. , Hamilton Ryan T. , Hanany Shaul , Harper Doyal A. , Lazarian Alex , Looney Leslie W. , Michail Joseph M. , Morris Mark R. , Novak Giles , Santos Fabio P. , Sheth Kartik , Stacey Gordon J. , Staguhn Johannes , Stephens Ian W. , Tassis Konstantinos , Trinh Christopher Q. , Volpert C. G. , Werner Michael , Wollack Edward J. ,   (HAWC+ Science Team)
Published: January 2019

Abstract
We present far-infrared polarimetry observations of M82 at 53 and 154 μm and NGC 253 at 89 μm, which were taken with High-resolution Airborne Wideband Camera-plus (HAWC+) in polarimetry mode on the Stratospheric Observatory for Infrared Astronomy. The polarization of M82 at 53 μm clearly shows a magnetic field geometry perpendicular to the disk in the hot dust emission. For M82 the polarization at 154 μm shows a combination of field geometry perpendicular to the disk in the nuclear region, but closer to parallel to the disk away from the nucleus. The fractional polarization at 53 μm (154 μm) ranges from 7% (3%) off nucleus to 0.5% (0.3%) near the nucleus. A simple interpretation of the observations of M82 invokes a massive polar outflow, dragging the field along, from a region ∼700 pc in diameter that has entrained some of the gas and dust, creating a vertical field geometry seen mostly in the hotter (53 μm) dust emission. This outflow sits within a larger disk with a more typical planar geometry that more strongly contributes to the cooler (154 μm) dust emission. For NGC 253, the polarization at 89 μm is dominated by a planar geometry in the tilted disk, with weak indication of a vertical geometry above and below the plane from the nucleus. The polarization observations of NGC 253 at 53 μm were of a insufficient signal-to-noise ratio for a detailed analysis.
Hypothèses sur une représentation du symbolique dans le système neuronal
Authors: Gintz Christine 
Published: January 2019

L’autisme est une affection neurodéveloppementale dont les conditions d’installation se mettent en place au tout début de la vie. Ce travail cherche à approcher la nature des particularités du développement neuronal autistique, à partir de deux voies d’abord : d’une part en analysant les effets neurobiologiques d’une mutation de novo monogénique dominante chez un sujet autiste, et d’autre part en examinant les particularités cliniques, et plus spécialement langagières qui touchent la plupart des personnes autistes, même de haut niveau. Deux questions sont centrales : celle des rythmes électriques cérébraux, et celle d’un réseau neuronal basal minimum autorisant l’accès au stade du miroir lacanien.
Accelerated Professional Development and Peer Consultation: Two Strategies for Continuing Professional Education for Nurses
Authors: Hart Gail , Clinton Michael , Edwards Helen , Evans Katie , Lunney Paul , Posner Natasha , Tooth Barbara , Weir Derek , Ryan Yoni 
Published: January 2019

ABSTRACT
This study was designed to evaluate a program of professional development for RNs working in mental health settings. The development of skills in reflective practice and peer consultation was fostered by encouraging nurses to explore critical incidents from their practice experience within a small group environment. The aim of the program was to improve the knowledge and skills of the participants, enhance the work environment and improve work performance. The effectiveness of the program was evaluated using a quasi-experimental pretest, posttest design. The participants demonstrated improvements in their empathic responses to patients, their sense of hope, and some aspects of their work performance and perceptions of the work environment. The implications of the findings for practice and research are outlined.
Registered Nurse Refresher Course as an Adjunct in Nurse Recruitment
Authors: Huggins Marilyn F 
Published: January 2019

ABSTRACT
A registered nurse refresher course in the east central region of Missouri has offered a singular opportunity for nurses wishing to re-enter the nursing profession. By offering both didactic instruction and clinical experience with a nurse mentor in the medical center, nurses who have been out of nursing or in a non-clinical role have had the chance to begin to reorient themselves to professional practice before committing to a permanent position. This article describes one institution's experience and process for those who might be considering developing a re-entry program of their own.
B Cell ADAM10 Controls Murine Lupus Progression through Regulation of the ICOS:ICOS Ligand Axis
Authors: Lownik Joseph C. , Wimberly Jessica L. , Conrad Daniel H. , Martin Rebecca K. 
Published: January 2019

Abstract
The role of ICOS and its ligand (ICOSL) have both been shown to be essential for proper humoral responses as well as autoimmune Ab development in mouse models of lupus. In this paper, we report a specific role for the metalloprotease ADAM10 on B cells in regulating both ICOSL and ICOS in a mouse model of increased humoral immunity using B6mir146a−/− mice and a model of lymphoproliferative disease using the well-characterized lpr model. B6lpr mice lacking ADAM10 on B cells (A10Blpr) have decreased nodal proliferation and T cell accumulation compared with control B6lpr mice. Additionally, A10Blpr mice have a drastic reduction in autoimmune anti-dsDNA Ab production. In line with this, we found a significant reduction in follicular helper T cells and germinal center B cells in these mice. We also show that lymphoproliferation in this model is closely tied to elevated ICOS levels and decreased ICOSL levels. Overall, our data not only show a role of B cell ADAM10 in control autoimmunity but also increase our understanding of the regulation of ICOS and ICOSL in the context of autoimmunity.
What's in a Word? Qualitative and Quantitative Analysis of Leadership Language in Anesthesiology Resident Feedback
Authors: Arkin Nicole , Lai Cara , Kiwakyou Larissa Miyachi , Lochbaum Gregory Milo , Shafer Audrey , Howard Steven K. , Mariano Edward R. , Fassiotto Magali 
Published: January 2019

ABSTRACT

Background
Individuals who have agentic traits (eg, assertive, confident, competent) that are more commonly associated with men are often selected for leadership roles. For women, this poses a potential barrier to entry into the higher ranks of academic medicine.

Objective
We analyzed anesthesiology resident feedback for differences in the use of agentic descriptors using qualitative and quantitative methods based on resident gender and year of training.

Methods
This study uses textual analysis of 435 assessments of residents over a 1-year period within a single residency program. We performed a qualitative content analysis on the words used in resident feedback and performed negative binomial regression analyses to determine significant differences in the way residents were described based on gender and year of training.

Results
Female residents were less likely than male residents to be described as agentic after controlling for excerpt length, year of training, and evaluator variability (β = –0.347; 95% confidence interval [CI] –0.666, –0.028; P = .033). Senior residents were more likely to be described as agentic (β = 0.702; 95% CI 0.402–1.002; P &lt; .001) compared to junior residents. The increased number of agentic codes among senior residents was driven by increased agentic description of female residents' ratings in the senior cohort (β = 0.704; 95% CI 0.084–1.324; P = .026).

Conclusions
Female residents were described as agentic less often than male residents in early years of training, but the gap was not present among senior residents.
Ensaio sobre a origem da vantagem competitiva e o desempenho operacional da firma a partir do uso de métricas contábeis
Authors: Louzada Luiz Claudio , Gonçalves Márcio Augusto , Ferreira Bruno Perez 
Published: January 2019

Este ensaio consiste em uma proposta de investigação da origem da vantagem competitiva da firma a partir do uso de métricas contidas na estrutura das demonstrações contábeis. A origem da vantagem competitiva é segregada em duas dimensões: endógenas, sendo formada por recursos à disposição da firma gerados a partir das escolhas dos gestores; e exógena, configurada por características do setor no qual a firma se insere, como o nível de competição e o dinamismo do setor de atividade. A origem da vantagem competitiva são variáveis explicativas do desempenho operacional da firma cujas proxies estão contidas na estrutura das demonstrações contábeis. Fundamentos contidos no arcabouço teórico da estratégia e no campo da contabilidade, quando aproximados, sugerem a existência de pesquisas entre campos do conhecimento que permitem investigar o desempenho da firma em seu contexto. Espera-se que a possibilidade de aproximação entre tais campos, (i)contribuir para o aumento da capacidade interpretativa dos indicadores contidos nas demonstrações contábeis quando relativizados ao ambiente em que a firma atua; e, por conseguinte, (ii)contribuir para a utilidade das métricas contábeis como proxies para pesquisas no campo da vantagem competitiva. Assim, este ensaio (iii) sugere as hipóteses e define uma metodologia de pesquisa para investigação da origem da vantagem competitiva com adoção de proxies contidas na estrutura das demonstrações contábeis.
Evaluating the malignant potential of intraductal papillary mucinous neoplasms of the pancreas: added value of non-enhanced endoscopic ultrasound to supplement non-enhanced magnetic resonance imaging
Authors: Igarashi Takao , Ashida Hirokazu , Morikawa Kazuhiko , Enoki Keitaro , Ohki Kazuyoshi , Kawakami Gou , Ojiri Hiroya 
Published: January 2019

PurposeTo evaluate the diagnostic performance of combining non-enhanced magnetic resonance imaging (MRI) and non-enhanced endoscopic ultrasonography (EUS) for assessing the malignant potential of lesions in patients with intraductal papillary mucinous neoplasms of the pancreas (IPMNs).Material and methodsData from 38 patients histopathologically diagnosed with IPMN adenomas or IPMN adenocarcinomas were retrospectively analysed. Preliminary univariate and multivariate analyses were conducted to identify statistically significant associations. Three blinded radiologists evaluated the image sets to assess the diagnostic performance of combined use of non-enhanced MRI and EUS as opposed to non-enhanced MRI alone in distinguishing malignant from benign lesions. Observer performance and interobserver variability were determined using receiver-operating-characteristic curve analysis and weighted κ statistics.ResultsMultivariate analyses identified a significant difference between the abrupt change in the main pancreatic duct (MPD) calibre with distal pancreatic atrophy and the signal intensity of lesion-to-spinal cord ratio on MRI; a significant difference was observed in MPD size on EUS. Diagnostic performance assessments of the image sets did not differ significantly between the blinded radiologists.ConclusionsThe clinical utility of non-enhanced EUS may be attributive in evaluating IPMN that has already been evaluated by non-enhanced MRI.
Reproducibility of intravoxel incoherent motion of liver on a 3.0T scanner: free-breathing and respiratory-triggered sequences acquired with different numbers of excitations
Authors: Cieszanowski Andrzej , Pasicz Katarzyna , Podgórska Joanna , Fabiszewska Ewa , Skrzyński Witold , Jasieniak Jakub , Anysz-Grodzicka Agnieszka , Grabska Iwona , Pałucki Jakub , Naduk-Ostrowska Martyna , Jagielska Beata , Kukołowicz Paweł 
Published: January 2019

PurposeTo optimise the intravoxel incoherent motion (IVIM) imaging of the liver on a 3.0T scanner by assessing parameter reproducibility on free-breathing (FB) and respiratory-triggered (RT) sequences acquired with different numbers of signal averages (NSA).Material and methodsIn this prospective study 20 subjects (M/F: 10/10; age: 25-62 years, mean: 39 years) underwent IVIM magnetic resonance imaging (MRI) on a 3.0T scanner using an 18-channel phase-arrayed coil and four different echo-planar sequences, each with 10 β values: 0, 10, 30, 50, 75, 100, 150, 200, 500, and 900 s/mm<sup>2</sup>. Images were acquired with FB and RT with NSA = 1-4 (FBNSA1-4, RTNSA1-4) and with NSA = 3-6 (FBNSA3-6, RTNSA3-6). Subsequently, for the assessment of reproducibility of IVIM-derived parameters (f, D, D*), each subject was scanned again with an identical protocol during the same session. IVIM parameters were calculated. The distribution of IVIM-parameters for each DWI sequence were given as the median value with first and third quartile. Inter-scan reproducibility for each IVIM parameter was evaluated using coefficient of variance and Bland-Altman difference. Differences between FB sequence and RT sequence were tested using non-parametric Wilcoxon signed-rank test.ResultsMean coefficient of variance (%) for f, D, and D* ranged from 60 to 64, from 58 to 84, and from 82 to 99 for FBNSA1-4 sequence; from 50 to 69, from 41 to 97, and from 80 to 82 for RTNSA1-4 sequence; from 22 to 27, 15, and from 70 to 80 for FBNSA3-6 sequence; and from 21 to 32, from 12 to, and from 50 to 80 for RTNSA3-6 sequence, respectively.ConclusionsIncreasing the number of signal averages for IVIM acquisitions allows us to improve the reproducibility of IVIM-derived parameters. The sequence acquired during free-breathing with NSA = 3-6 was optimal in terms of reproducibility and acquisition time.
The utility of ADC measurement techniques for differentiation of low- and high-grade clear cell RCC
Authors: Aslan Ahmet , İnan İbrahim , Aktan Ahmet , Ayaz Ercan , Aslan Mine , Özkanlı Sıdıka Şeyma , Yildirim Asif , Yıkılmaz Ali 
Published: January 2019

PurposeTo evaluate the diffusion properties of clear cell renal cell carcinoma (ccRCC) on magnetic resonance imaging (MRI) concerning their Fuhrman nuclear grades and sizes, and to compare the diagnostic performance of two ROI placement techniques for apparent diffusion coefficient (ADC) measurement (entire mass vs. only the darkest region of the mass).Material and methodsFifty-one ccRCC were enrolled in the study and grouped into low-grade ccRCC (Fuhrman grade 1 and 2, n = 37) and high-grade ccRCC (Fuhrman grade 3 and 4, n = 14). Selective ADC (Sel-ADC) measurement was performed by placing a circular ROI that included the darkest region of the tumour on ADC map images. Extensive ADC (Ext-ADC) measurement was performed by drawing an ROI that covered the entire tumour.ResultsThe Sel-ADC value was lower in high-grade ccRCC (p = 0.019), whereas the Ext-ADC value did not show a statistically significant difference (p = 0.42). Sel-ADC value of a ≤ 1.405 mm2/s has a sensitivity, specificity, positive predictive value, negative predictive value, and accuracy value of 78.6, 72.2, 73.87, 77.13, and 75.4, respectively, to differentiate high-grade from low-grade ccRCC. The size and Fuhrman grade of the ccRCC were inversely correlated with the Sel-ADC value; however, the correlations were weak (r = –0.322, p = 0.021 and r = –0.376, p = 0.006, respectively). There was no difference between ADC values of small (≤ 4 cm) and large (> 4 cm) ccRCCs.ConclusionsThe ADC value of the darkest region in solid part of the ccRCC may play a role in predicting the nuclear grade of ccRCC.
Tibial stress injuries – location, severity, and classification in magnetic resonance imaging examination
Authors: Gmachowska Agata Maria , Żabicka Magdalena , Pacho Ryszard , Pacho Szymon , Majek Aleksandra , Feldman Beata 
Published: January 2019

PurposeTo describe and illustrate the spectrum of magnetic resonance imaging (MRI) findings of tibial stress injuries (TSI) and propose a simplified classification system.Material and methodsRetrospective analysis of MRI exams of 44 patients with clinical suspicion of unilateral or bilateral TSI, using a modified classification system to evaluate the intensity and location of soft-tissue changes and bone changes.ResultsMost of the patients were young athletic men diagnosed in late stage of TSI. Changes were predominantly found in the middle and distal parts of tibias along medial and posterior borders.ConclusionsTSI may be suspected in young, healthy patients with exertional lower leg pain. MRI is the only diagnostic method to visualise early oedematic signs of TSI. Knowledge of typical locations of TSI can be helpful in proper diagnosis before its evolution to stress fracture.