bluuebunny/crossref_metadata_2025_split huggingface dataset:
QUASAR VARIABILITY IN THE MID-INFRARED
Authors: Kozłowski Szymon , Kochanek Christopher S. , Ashby Matthew L. N. , Assef Roberto J. , Brodwin Mark , Eisenhardt Peter R. , Jannuzi Buell T. , Stern Daniel 
Published: January 2016

ABSTRACT
The Decadal IRAC Boötes Survey is a mid-IR variability survey of the ∼9 sq. deg. of the NDWFS Boötes Field and extends the time baseline of its predecessor, the Spitzer Deep, Wide-Field Survey (SDWFS), from 4 to 10 years. The Spitzer Space Telescope visited the field five times between 2004 and 2014 at 3.6 and 4.5 μm. We provide the difference image analysis photometry for a half a million mostly extragalactic sources. In mid-IR color–color plane, sources with quasar colors constitute the largest variability class (75%), 16% of the variable objects have stellar colors and the remaining 9% have the colors of galaxies. Adding the fifth epoch doubles the number of variable active galactic nuclei (AGNs) for the same false positive rates as in SDWFS, or increases the number of sources by 20% while decreasing the false positive rates by factors of 2–3 for the same variability amplitude. We quantify the ensemble mid-IR variability of ∼1500 spectroscopically confirmed AGNs using single power-law structure functions (SFs), which we find to be steeper (index

) than in the optical (

), leading to much lower amplitudes at short time-lags. This provides evidence for large emission regions, smoothing out any fast UV/optical variations, as the origin of infrared quasar variability. The mid-IR AGN SF slope γ seems to be uncorrelated with both the luminosity and rest-frame wavelength, while the amplitude shows an anti-correlation with the luminosity and a correlation with the rest-frame wavelength.
DIRECT DETECTION OF THE HELICAL MAGNETIC FIELD GEOMETRY FROM 3D RECONSTRUCTION OF PROMINENCE KNOT TRAJECTORIES
Authors: Zapiór Maciej , Martínez-Gómez David 
Published: January 2016

ABSTRACT
Based on the data collected by the Vacuum Tower Telescope located in the Teide Observatory in the Canary Islands, we analyzed the three-dimensional (3D) motion of so-called knots in a solar prominence of 2014 June 9. Trajectories of seven knots were reconstructed, giving information of the 3D geometry of the magnetic field. Helical motion was detected. From the equipartition principle, we estimated the lower limit of the magnetic field in the prominence to ≈1–3 G and from the Ampère’s law the lower limit of the electric current to ≈1.2 × 109 A.
TURBULENT AMPLIFICATION AND STRUCTURE OF THE INTRACLUSTER MAGNETIC FIELD
Authors: Beresnyak Andrey , Miniati Francesco 
Published: January 2016

ABSTRACT
We compare DNS calculations of homogeneous isotropic turbulence with the statistical properties of intracluster turbulence from the Matryoshka Run and find remarkable similarities between their inertial ranges. This allowed us to use the time-dependent statistical properties of intracluster turbulence to evaluate dynamo action in the intracluster medium, based on earlier results from a numerically resolved nonlinear magneto-hydrodynamic turbulent dynamo. We argue that this approach is necessary (a) to properly normalize dynamo action to the available intracluster turbulent energy and (b) to overcome the limitations of low Re affecting current numerical models of the intracluster medium. We find that while the properties of intracluster magnetic field are largely insensitive to the value and origin of the seed field, the resulting values for the Alfvén speed and the outer scale of the magnetic field are consistent with current observational estimates, basically confirming the idea that the magnetic field in today’s galaxy clusters is a record of its past turbulent activity.
THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b
Authors: Gao F. , Braatz J. A. , Reid M. J. , Lo K. Y. , Condon J. J. , Henkel C. , Kuo C. Y. , Impellizzeri C. M. V. , Pesce D. W. , Zhao W. 
Published: January 2016

ABSTRACT
As part of the Megamaser Cosmology Project, here we present a new geometric distance measurement to the megamaser galaxy NGC 5765b. Through a series of very long baseline interferometry observations, we have confirmed the water masers trace a thin, sub-parsec Keplerian disk around the nucleus, implying an enclosed mass of 4.55 ± 0.40 × 107
M
⊙. Meanwhile, from single-dish monitoring of the maser spectra over two years, we measured the secular drifts of maser features near the systemic velocity of the galaxy with rates between 0.5 and 1.2 km s−1 yr−1. Fitting a warped, thin-disk model to these measurements, we determine a Hubble Constant H
0 of 66.0 ± 6.0 km s−1 Mpc−1 with an angular-diameter distance to NGC 5765b of 126.3 ± 11.6 Mpc. Apart from the distance measurement, we also investigate some physical properties related to the maser disk in NGC 5765b. The high-velocity features are spatially distributed into several clumps, which may indicate the existence of a spiral density wave associated with the accretion disk. For the redshifted features, the envelope defined by the peak maser intensities increases with radius. The profile of the systemic masers in NGC 5765b is smooth and shows almost no structural changes over the two years of monitoring time, which differs from the more variable case of NGC 4258.
A SOLAR-TYPE STELLAR COMPANION TO A DEEP CONTACT BINARY IN A QUADRUPLE SYSTEM
Authors: Zhou X. , Qian S.-B. , Zhang J. , Jiang L.-Q. , Zhang B. , Kreiner J. 
Published: January 2016

ABSTRACT
The four-color (B, V, R

c
, I

c
) light curves of V776 Cas are presented and analyzed using the Wilson–Devinney method. It is discovered that V776 Cas is an early F-type (F2V) overcontact binary with a very high contact degree (f = 64.6%) and an extremely low-mass ratio (q = 0.130), which indicate that it is at the final evolutionary stage of cool short-period binaries. The mass of the primary and secondary stars are calculated to be M
1 = 1.55(±0.04) M
⊙, M
2 = 0.20(±0.01) M
⊙. V776 Cas is supposed to be formed from an initially detached binary system via the loss of angular momentum due to the magnetic wind. The initial masses of the present primary and secondary components are calculated to be M
1i
= 0.86(±0.10) M
⊙ and M
2i
= 2.13(±0.04) M
⊙. The observed–calculated curve exhibits a cyclic period variation, which is due to the light-travel time effect caused by the presence of a third component with a period of 23.7 years. The mass of the third component is estimated to be M
3 = 1.04(±0.03) M
⊙ and the orbital inclination of the third component is calculated to be i′ = 33.°1. The distance of the binary system to the mass center of the triple system is calculated to be

= 3.45 AU. The presence of the close-in tertiary component may play an important role in the formation and evolution of this binary system by drawing angular momentum from the central system.
A SEARCH FOR WATER IN THE ATMOSPHERE OF HAT-P-26b USING LDSS-3C
Authors: Stevenson Kevin B. , Bean Jacob L. , Seifahrt Andreas , Gilbert Gregory J. , Line Michael R. , Désert Jean-Michel , Fortney Jonathan J. 
Published: January 2016

ABSTRACT
The characterization of a physically diverse set of transiting exoplanets is an important and necessary step toward establishing the physical properties linked to the production of obscuring clouds or hazes. It is those planets with identifiable spectroscopic features that can most effectively enhance our understanding of atmospheric chemistry and metallicity. The newly commissioned LDSS-3C instrument on Magellan provides enhanced sensitivity and suppressed fringing in the red optical, thus advancing the search for the spectroscopic signature of water in exoplanetary atmospheres from the ground. Using data acquired by LDSS-3C and the Spitzer Space Telescope, we search for evidence of water vapor in the transmission spectrum of the Neptune-mass planet HAT-P-26b. Our measured spectrum is best explained by the presence of water vapor, a lack of potassium, and either a high-metallicity, cloud-free atmosphere or a solar-metallicity atmosphere with a cloud deck at ∼10 mbar. The emergence of multi-scale-height spectral features in our data suggests that future observations at higher precision could break this degeneracy and reveal the planet’s atmospheric chemical abundances. We also update HAT-P-26b’s transit ephemeris, t
0 = 2455304.65218(25) BJDTDB, and orbital period, p = 4.2345023(7) days.
Validating the Japanese Self-Directed Learning Readiness Scale for Nursing Education
Authors: Fujino-Oyama Yumiko , Maeda Rumi , Maru Mitsue , Inoue Tomoko 
Published: January 2016

Background:
The Self-Directed Learning Readiness Scale for Nursing Education (SDLRSNE) assesses the extent to which an individual has the characteristics, capabilities, and attitudes required for self-directed learning. This study aimed to validate the Japanese version of the SDLRSNE with graduate-level nursing students.

Method:
Confirma-tory factor analyses, using data from a cross-sectional online survey of 376 nursing students, were conducted to examine construct validity. Relationships with potential related factors were analyzed to evaluate construct validity. Reliability was evaluated with item analysis and Cronbach's alpha.

Results:
Factor analyses revealed that three-factor and individual subscale models had a moderate-to-poor fit. No meaningful relationship with potential related factors was noted. Reliability measurements indicated a moderate fit to data.

Conclusion:

This study could not confirm that the Japanese version of the SDLRSNE had acceptable levels of reliability and validity when tested with graduate-level nursing students. Further research is needed to examine the psychometric properties of the Japanese version of the SDLRSNE with other adult nursing learners or with graduate-level nursing students in other countries. [
J Nurs Educ.
2016;55(2):65–71.]
Power of Peer-Assisted Learning: An Interdisciplinary Mobility Laboratory Experience
Authors: Lorio Anne K. , Florman Terri M. , Gore Jane B. , Housley Stephen N. , Nelson Michelle A. 
Published: January 2016

Background:
The benefits of early patient mobility in the hospital environment has been well established. This article highlights an interactive peer-assisted learning (PAL) mobility laboratory. Physical therapy (PT) students taught patient mobility skills to nursing students, with the goal of enhancing mobility knowledge and improved understanding of the two disciplines' roles and responsibilities.

Method:
The students were divided into 10 groups, with six nursing and three PT students in each group; each group rotated through the 10 mobility stations every 20 minutes. After completing all stations, the nursing students reviewed a case scenario requiring application of the recently learned knowledge and skills.

Results:
Analysis revealed that the nursing students demonstrated significant improvement in overall knowledge of safe patient mobility, as well as improved confidence in the instruction of safe patient mobility.

Conclusion:

Both groups reported that the PAL strategy was successful in achieving the intended goals of improved interprofessional understanding. [
J Nurs Educ.
2016; 55(2):83–86.]
Honoring Diversity: Developing Culturally Competent Communication Skills Through Simulation
Authors: Bahreman Nasreen T. , Swoboda Sandra M. 
Published: January 2016

Background:
Students in nursing programs must learn how to communicate with patients in a culturally competent manner.

Method:
This article explores current best practices in nursing education regarding the inclusion of diversity and cultural humility in the program of study and provides recommendations for innovative ways of thoughtfully threading cultural competence into the curriculum.

Results:
Mastering culturally competent communication is unlike any other nursing skill, deserving of a creative way of teaching. This article describes the use of the pedagogy in simulation to create the opportunity to introduce scenarios where students care for patients of diverse backgrounds.

Conclusion:

Establishing cultural competence encompasses more than just learning about different cultures. A true emergent experience using standardized patients and scenarios highlighting the cultural considerations that nurses need to be cognizant of and comfortable with can provide a new way of teaching this relevant and current topic. [
J Nurs Educ.
2016;55(2):105–108.]
Preparing Nurse Leaders to Innovate: Iowa's Innovation Seminar
Authors: Joseph M. Lindell , Rhodes Ann , Watson Carol A. 
Published: January 2016

Background:
Currently, no doctoral guidelines to teach innovation exist. Using Christensen's theory of disruptive innovation, the five discovery skills used by disruptive innovators provide the framework for designing a leadership development approach to enable and support a mindset to innovate.

Method:
Executive leadership students were provided with didactic content on innovation, were assigned to nonhealth care settings for an anthropological dig to uncover innovative activities, and were provided with reflective prompts to enable a new context for innovation. Faculty collaborated with other flelds and took risks to provide new contexts to innovate.

Results:
Students identified and proposed innovations for current health care issues. Some of the innovations included processes, evaluation methods, data analytics for care design, and patient engagement solutions.

Conclusion:

Faculty crossed borders for fleld experiences, as well as disciplinary borders. This collaborative seminar demonstrated that it is possible to develop executive nurse leaders to innovate. [
J Nurs Educ.
2016;55(2):113–117.]
Las prácticas pedagógicas y la incorporación de la computadora en el aula: Una experiencia desde el programa "Una computadora por niño (Paraguay)"
Authors: Misiego Telesca Patricia Alejandra , Demelenne Dominique 
Published: January 2016

Esta investigación analiza el cambio en las interacciones entre el docente y sus estudiantes a partir de la incorporación de la computadora en aula. El estudio realiza entrevistas y observaciones de clase y sus hallazgos dan cuenta de cambios en las interacciones pedagógicas, los procesos de socialización, los procesos cognitivos y las competencias digitales de los estudiantes.
Un estudio discursivo de la identidad de profesores de matemática en formación de posgrado
Authors: Molfino Vigo Verónica , Ochoviet Filgueiras Cristina 
Published: January 2016

En el marco de un curso de formación de posgrado, identificamos algunos aspectos que podrían estar incidiendo en la configuración de la identidad de profesores de Matemática. Desde la perspectiva de Sfard y Prusak (2005a, 2005b) analizamos las bitácoras de seis docentes realizadas a lo largo del curso, atendiendo a aspectos que dieran pautas sobre la identidad designada y real, y a una posible transición entre ellas a partir de los contenidos abordados. Observamos que los cambios en la identidad se corresponden, fundamentalmente, con la dimensión que priorizan los profesores en sus clases: el aprendizaje o los objetos matemáticos.
Magnetohydrodynamic Natural Convection in a Rotating Enclosure
Authors: Saleh H. , Hashim I. 
Published: January 2016

AbstractMagnetohydrodynamic natural convection heat transfer in a rotating, differentially heated enclosure is studied numerically in this article. The governing equations are in velocity, pressure and temperature formulation and solved using the staggered grid arrangement together with MAC method. The governing parameters considered are the Hartmann number, 0≤Ha≤70, the inclination angle of the magnetic field, 0°≤θ 90°, the Taylor number, 8.9 x 104≤Ta≤1.1 x 106 and the centrifugal force is smaller than the Coriolis force and the both forces were kept below the buoyancy force. It is found that a sufficiently large Lorentz force neutralizes the effect of buoyancy, inertial and Coriolis forces. Horizontal or vertical direction of the magnetic field was most effective in reducing the global heat transfer.
Brittle and Ductile Character of Amorphous Solids
Authors: Lagos Miguel , Das Raj 
Published: January 2016

Abstract.Common silicate glasses are among the most brittle of the materials. However, on warming beyond the glass transition temperature Tg glass transforms into one of the most plastic known materials. Bulk metallic glasses exhibit similar phenomenology, indicating that it rests on the disordered structure instead on the nature of the chemical bonds. The micromechanics of a solid with bulk amorphous structure is examined in order to determine the most basic conditions the system must satisfy to be able of plastic flow. The equations for the macroscopic flow, consistent with the constrictions imposed at the atomic scale, prove that a randomly structured bulk material must be either a brittle solid or a liquid, but not a ductile solid. The theory permits to identify a single parameter determining the difference between the brittle solid and the liquid. However, the system is able of perfect ductility if the plastic flow proceeds in two dimensional plane layers that concentrate the strain. Insight is gained on the nature of the glass transition, and the phase occurring between glass transition and melting.
Noise Prediction in Subsonic Flow Using Seventh-Order Dissipative Compact Scheme on Curvilinear Mesh
Authors: Mao Meiliang , Jiang Yi , Deng Xiaogang , Liu Huayong 
Published: January 2016

AbstractIn this paper, we investigate the performance of the seventh-order hybrid cell-edge and cell-node dissipative compact scheme (HDCS-E8T7) on curvilinear mesh for noise prediction in subsonic flow. In order to eliminate the errors due to surface conservation law (SCL) is dissatisfied on curvilinear meshes, the symmetrical conservative metric method (SCMM) is adopted to calculate the grid metric derivatives for the HDCS-E8T7. For the simulation of turbulence flow which may have main responsibility for the noise radiation, the new high-order implicit large eddy simulation (HILES) based on the HDCS-E8T7 is employed. Three typical cases, i.e., scattering of acoustic waves by multiple cylinder, sound radiated from a rod-airfoil and subsonic jet noise from nozzle, are chosen to investigate the performance of the new scheme for predicting aeroacoustic problem. The results of scattering of acoustic waves by multiple cylinder indicate that the HDCS-E8T7 satisfying the SCL has high resolution for the aeroacoustic prediction. The potential of the HDCS-E8T7 for aeroacoustic problems on complex geometry is shown by the predicting sound radiated from a rod-airfoil configuration. Moreover, the subsonic jet noise from nozzle has been successfully predicted by the HDCS-E8T7.
Bell Polynomials to the Kadomtsev-Petviashivili Equation with Self-Consistent Sources
Authors: Deng Shufang 
Published: January 2016

AbstractBell Polynomials play an important role in the characterization of bilinear equation. Bell Polynomials are extended to construct the bilinear form, bilinear Bäckhand transformation and Lax pairs for the Kadomtsev-Petviashvili equation with self-consistent sources.
Uniform Convergence Analysis of a Higher Order Hybrid Stress Quadrilateral Finite Element Method for Linear Elasticity Problems
Authors: Bai Yanhong , Wu Yongke , Xie Xiaoping 
Published: January 2016

Abstract.This paper derives a higher order hybrid stress finite element method on quadrilateral meshes for linear plane elasticity problems. The method employs continuous piecewise bi-quadratic functions in local coordinates to approximate the displacement vector and a piecewise-independent 15-parameter mode to approximate the stress tensor. Error estimation shows that the method is free from Poisson-locking and has second-order accuracy in the energy norm. Numerical experiments confirm the theoretical results.
Study of Heat Transfer Control with Magnetic Field Using Higher Order Finite Difference Scheme
Authors: Sivakumar R. , Vimala S. , Damodaran S. , Sekhar T. V. S. 
Published: January 2016

Abstract.The control of convective heat transfer from a heated circular cylinder immersed in an electrically conducting fluid is achieved using an externally imposed magnetic field. A Higher Order Compact Scheme (HOCS) is used to solve the governing energy equation in cylindrical polar coordinates. The HOCS gives fourth order accurate results for the temperature field. The behavior of local Nusselt number, mean Nusselt number and temperature field due to variation in the aligned magnetic field is evaluated for the parameters 5≤Re≤40, 0≤N≤20 and 0.065≤Pr≤7. It is found that the convective heat transfer is suppressed by increasing the strength of the imposed magnetic field until a critical value of N, the interaction parameter, beyond which the heat transfer increases with further increase in N. The results are found to be in good agreement with recent experimental studies.
Elastic-Plastic Analysis for Functionally Graded Thick-Walled Tube Subjected to Internal Pressure
Authors: Xin Libiao , Dui Guansuo , Yang Shengyou , Liu Ying 
Published: January 2016

AbstractThe elastic-plastic response of the functionally graded thick-walled tube subjected to internal pressure is investigated by using the relation of the volume average stresses of constituents and the macroscopic stress of composite material in micromechanics. The tube consists of two idealized isotropic elastic-plastic materials whose volume fractions are power functions of the radius. As the internal pressure increases, the deformations of one phase and two phases from elastic to plastic are analyzed. In order to simplify the calculations we assume both materials with the same Poisson's ratio. By using the assumption of a uniform strain field within the representative volume element and the Tresca yield criterion, the theoretical solutions are obtained for the case of two elastic phases and the case of two plastic phases, and the function of the radial displacement is presented for the case with both elastic and plastic phases. The yield criterion of functionally graded material is given in terms of the yield stresses and volume fractions of constituents rather than Young's modulus and yield stress with different unknown parameters of the whole material in the existing papers. Finally we also discuss the position where the plastic deformation first occurs and the conditions for which material first yields in the tube.
Distributed Control of the Stochastic Burgers Equation with Random Input Data
Authors: Lee Hyung-Chun , Nam Yun 
Published: January 2016

AbstractWe discuss a control problem involving a stochastic Burgers equation with a random diffusion coefficient. Numerical schemes are developed, involving the finite element method for the spatial discretisation and the sparse grid stochastic collocation method in the random parameter space. We also use these schemes to compute closed-loop suboptimal state feedback control. Several numerical experiments are performed, to demonstrate the efficiency and plausibility of our approximation methods for the stochastic Burgers equation and the related control problem.
Traffic Lights or Roundabout? Analysis using the Modified Kinematic LWR Model
Authors: Pudjaprasetya S. R. , Bunawan J. , Novtiar C. 
Published: January 2016

AbstractTraffic flow is treated as a continuum governed by the kinematic LWR model and the Greenshield flux function. The model is modified to describe traffic flow on a road with traffic lights or a roundabout. Parameters introduced determine the traffic flow behaviour and queue formation, and numerical simulations based on the Godunov method are carried out. The numerical procedure is shown to converge, and produces results consistent with previous analytic results.