bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ensuring the technological capability of ship hull structures when creating an electronic model
Authors: Лебедева Е.Г. , Сомпольцева А.А. 
Published: September 2020

В статье рассмотрен процесс создания системы и механизма управления технологичностью судовых конструкций, сделана попытка создания единого подхода к теоретической оценке технологичности. Определены основные задачи обеспечения технологичности судовых корпусных конструкций на этапе проектирования и подготовки производства, а также пути реализации этих задач в условиях создания информационной модели конструкции и ее дальнейшего применения в процессе конструкторско-технологической подготовки судостроительного производства. Приведен ожидаемый эффект внедрения от решения проблемы обеспечения технологичности судовых корпусных конструкций на судостроительном предприятии. Представлена информационная модель судовой корпусной конструкции с учетом оценки параметров технологичности и показана взаимосвязь между рассматриваемыми объектами технологической схемы. Проведен анализ проработки деталей судовых корпусных конструкции на технологичность. Приведена схема системы анализа технологичности судовой корпусной конструкции. Определен характер проблемы обеспечения технологичности и направление разработки структуры и создания единой методики проработки деталей на технологичность.
The article considers the process of creating a system and mechanism for managing the manufacturability of ship structures, and attempts to create a unified approach to the theoretical assessment of manufacturability. The main tasks of ensuring the manufacturability of ship hull structures at the design and pre-production stage, as well as ways to implement these tasks in the conditions of creating an information model of the structure and its further application in the process of design and technological preparation of shipbuilding production, are defined. The expected implementation effect of solving the problem of ensuring the manufacturability of ship hull structures at a shipbuilding enterprise is given. An information model of a ship's hull structure is presented, taking into account the assessment of technological parameters, and the relationship between the considered objects of the technological scheme is shown. The analysis of working out details of ship hull structures on manufacturability is carried out. The scheme of the system for analyzing the manufacturability of a ship's hull structure is presented. The nature of the problem of ensuring manufacturability and the direction of developing the structure and creating a unified methodology for working out details for manufacturability are determined.
HAWC+ Far-infrared Observations of the Magnetic Field Geometry in M51 and NGC 891
Authors: Jones Terry Jay , Kim Jin-Ah , Dowell C. Darren , Morris Mark R. , Pineda Jorge L. , Benford Dominic J. , Berthoud Marc , Chuss David T. , Dale Daniel A. , Fissel L. M. , Goldsmith Paul F. , Hamilton Ryan T. , Hanany Shaul , Harper Doyal A. , Henning Thomas K. , Lazarian Alex , Looney Leslie W. , Michail Joseph M. , Novak Giles , Santos Fabio P. , Sheth Kartik , Siah Javad , Stacey Gordon J. , Staguhn Johannes , Stephens Ian W. , Tassis Konstantinos , Trinh Christopher Q. , Vaillancourt John E. , Ward-Thompson Derek , Werner Michael , Wollack Edward J. , Zweibel Ellen G. ,   (HAWC+ Science Team)
Published: September 2020

Abstract
Stratospheric Observatory for Infrared Astronomy High-resolution Airborne Wideband Camera Plus polarimetry at 154 μm is reported for the face-on galaxy M51 and the edge-on galaxy NGC 891. For M51, the polarization vectors generally follow the spiral pattern defined by the molecular gas distribution, the far-infrared (FIR) intensity contours, and other tracers of star formation. The fractional polarization is much lower in the FIR-bright central regions than in the outer regions, and we rule out loss of grain alignment and variations in magnetic field strength as causes. When compared with existing synchrotron observations, which sample different regions with different weighting, we find the net position angles are strongly correlated, the fractional polarizations are moderately correlated, but the polarized intensities are uncorrelated. We argue that the low fractional polarization in the central regions must be due to significant numbers of highly turbulent segments across the beam and along lines of sight in the beam in the central 3 kpc of M51. For NGC 891, the FIR polarization vectors within an intensity contour of 1500

are oriented very close to the plane of the galaxy. The FIR polarimetry is probably sampling the magnetic field geometry in NGC 891 much deeper into the disk than is possible with NIR polarimetry and radio synchrotron measurements. In some locations in NGC 891, the FIR polarization is very low, suggesting we are preferentially viewing the magnetic field mostly along the line of sight, down the length of embedded spiral arms. There is tentative evidence for a vertical field in the polarized emission off the plane of the disk.
Near-infrared Characterization of Four Massive Stars in Transition Phases*
Authors: Cochetti Yanina R. , Kraus Michaela , Arias María L. , Cidale Lydia S. , Eenmäe Tõnis , Liimets Tiina , Torres Andrea F. , Djupvik Anlaug A. 
Published: September 2020

Abstract
Massive stars typically undergo short-lived post-main-sequence evolutionary phases with strong mass loss and occasional mass eruptions. Many of such massive stars in transition phases have been identified based on their dusty envelopes. The ejected material often veils the stellar photospheres so that the central stars cannot be assigned proper spectral types and evolutionary stages. The infrared spectral range has proved to be ideal for the classification of evolved massive stars and for the characterization of their environments. To improve our knowledge on the central stars of four such dust-enshrouded objects, [GKF 2010] MN 83, [GKF 2010] MN 108, [GKF 2010] MN 109, and [GKF 2010] MN 112, we collect and present their first medium-resolution K-band spectra in the 2.3–2.47 μm region and discuss the location of the stars in the JHK color–color diagram. We find that the emission-line spectra of both MN 83 and MN 112 show characteristics typically seen in luminous blue variable (LBV) stars. In addition, we propose that the presence and strength of the newly reported Mg ii lines might be used as a new complementary criterion to identify LBV candidates. The spectra of the other two objects imply that MN 108 is an O-type supergiant, whereas MN 109 could be an LBV candidate in its active phase. We derive lower limits for the reddening toward the stars and find that three of all dereddened fall into the region of confirmed LBVs.
The Sloan Digital Sky Survey Reverberation Mapping Project: Mg ii Lag Results from Four Years of Monitoring
Authors: Homayouni Y. , Trump Jonathan R. , Grier C. J. , Horne Keith , Shen Yue , Brandt W. N. , Dawson Kyle S. , Alvarez Gloria Fonseca , Green Paul J. , Hall P. B. , Hernández Santisteban Juan V. , Ho Luis C. , Kinemuchi Karen , Kochanek C. S. , Li Jennifer I-Hsiu , Peterson B. M. , Schneider D. P. , Starkey D. A. , Bizyaev Dmitry , Pan Kaike , Oravetz Daniel , Simmons Audrey 
Published: September 2020

Abstract
We present reverberation mapping results for the Mg ii
λ2800 Å broad emission line in a sample of 193 quasars at

0.35
<
z
<
1.7

with photometric and spectroscopic monitoring observations from the Sloan Digital Sky Survey Reverberation Mapping project during 2014–2017. We find significant time lags between the Mg ii and continuum lightcurves for 57 quasars, and define a “gold sample” of 24 quasars with the most reliable lag measurements. We estimate false-positive rates for each lag that range from 1% to 24%, with an average false-positive rate of 11% for the full sample and 8% for the gold sample. There are an additional ∼40 quasars with marginal Mg ii lag detections, which may yield reliable lags after additional years of monitoring. The Mg ii lags follow a radius–luminosity relation with a best-fit slope that is consistent with

α
=
0.5

, but with an intrinsic scatter of 0.36 dex that is significantly larger than found for the Hβ radius–luminosity relation. For targets with SDSS-RM lag measurements of other emission lines, we find that our Mg ii lags are similar to the Hβ lags and ∼2–3 times larger than the C iv lags. This work significantly increases the number of Mg ii broad-line lags and provides additional reverberation-mapped black hole masses, filling the redshift gap at the peak of supermassive black hole growth between the Hβ and C iv emission lines in optical spectroscopy.
Simulating Jets from a Neutron Star Companion Hours after a Core-collapse Supernova
Authors: Akashi Muhammad , Soker Noam 
Published: September 2020

Abstract
We conduct three-dimensional hydrodynamical simulations to explore the interaction of the jets that a neutron star (NS) companion to a type Ic or type Ib core-collapse supernova (CCSN) launches a few hours after explosion with the ejecta of the CCSN. We assume that an NS companion at 5 R
⊙ from the exploding star accretes mass from the slower inner ejecta through an accretion disk, and that the disk launches two opposite jets. Although the energy of the jets is only about one percent of the total energy of the ejecta, it is comparable to the energy of the slower inner part of the ejecta. We find that the jets inflate one low-density hot bubble to one side of the ejecta, and that this bubble expands to influence ejecta gas up to expansion velocities of

. The postshock jets’ material develops a large meridional flow and small vortexes. The boundary between the ejecta and jets’ postshock gases is unstable. The instabilities and vortexes mix jets’ gas with the ejecta. We expect such a hot bubble to contribute to the light curve of CCSNe that are progenitors of binary NS systems, in particular to observers on the side of the bubble.
Modeling Unresolved Binaries of Open Clusters in the Color–Magnitude Diagram. I. Method and Application of NGC 3532
Authors: Li 李 Lu 璐 , Shao 邵正 Zhengyi 义 , Li 李昭 Zhao-Zhou 洲 , Yu 俞锦 Jincheng 程 , Zhong 钟 Jing 靖 , Chen 陈 Li 力 
Published: September 2020

Abstract
The binary properties of open clusters place crucial constraints on star formation theory and clusters’ dynamical evolution. We develop a comprehensive approach that models the color–magnitude diagram (CMD) of the cluster members as a mixture of single stars and photometric unresolved binaries. This method enables us to infer the binary properties, including the binary fraction f
b and binary mass ratio distribution index γ

q
when a power law is assumed, with high accuracy and precision, which was unfeasible in conventional methods. We employ a modified Gaussian process to determine the main-sequence ridgeline and its scatter from the observed CMD as model input. As a first example, we apply the method to the open cluster NGC 3532 with the Gaia DR2 photometry. For the cluster members within a magnitude range corresponding to FGK dwarfs, we obtain f
b = 0.267 ± 0.019 and γ

q
= −0.10 ± 0.22 for binaries with mass ratio q > 0.2. The f
b value is consistent with the previous work on NGC 3532 and smaller than that of field stars. The close-to-zero γ

q
indicates that the mass ratios of binaries follow a nearly uniform distribution. For the first time, we unveil that the stars with smaller mass or in the inner region tend to have lower f
b and a more positive value of γ

q
due to the lack of low mass ratio binaries. The clear dependences of binary properties on mass and radius are most likely caused by the internal dynamics. In this scheme, binaries with smaller primary mass or lower mass ratio have smaller binding energy; hence, they are more vulnerable to dynamical disruption, especially in the inner region where stars interact more frequently.
Amplification of Brightness Variability by Active-region Nesting in Solar-like Stars
Authors: Işık Emre , Shapiro Alexander I. , Solanki Sami K. , Krivova Natalie A. 
Published: September 2020

Abstract
Kepler observations revealed that hundreds of stars with near-solar fundamental parameters and rotation periods have much stronger and more regular brightness variations than the Sun. Here we identify one possible reason for the peculiar behavior of these stars. Inspired by solar nests of activity, we assume that the degree of inhomogeneity of active-region (AR) emergence on such stars is higher than on the Sun. To test our hypothesis, we model stellar light curves by injecting ARs consisting of spots and faculae on stellar surfaces at various rates and nesting patterns, using solar AR properties and differential rotation. We show that a moderate increase of the emergence frequency from the solar value combined with the increase of the degree of nesting can explain the full range of observed amplitudes of variability of Sun-like stars with nearly the solar rotation period. Furthermore, nesting in the form of active longitudes, in which ARs tend to emerge in the vicinity of two longitudes separated by 180°, leads to highly regular, almost sine-like variability patterns, rather similar to those observed in a number of solar-like stars.
Pair Separation in Parallel Electric Field in Magnetar Magnetosphere and Narrow Spectra of Fast Radio Bursts
Authors: Yang Yuan-Pei , Zhu Jin-Ping , Zhang Bing , Wu Xue-Feng 
Published: September 2020

Abstract
When the magnetosphere of a magnetar is perturbed by crustal deformation, an electric field E
∥ parallel to the magnetic field line would appear via Alfvén waves in the charge starvation region. The electron–positron pair bunches will be generated via two-stream instability in the magnetosphere, and these pairs will undergo charge separation in the E
∥ and in the meantime emit coherent curvature radiation. Following the approach of Yang & Zhang, we find that the superposed curvature radiation becomes narrower due to charge separation, with the width of spectrum depending on the separation between the electron and positron clumps. This mechanism can interpret the narrow spectra of fast radio bursts (FRBs), in particular, the spectrum of Galactic FRB 200428 recently detected in association with a hard X-ray burst from the Galactic magnetar SGR J1935+2154.
The Large Far Ultraviolet Variations of α Cir A and α Cir B as Recorded by IUE and FUSE
Authors: Monier Richard 
Published: September 2020

Abstract
Inspection of archival IUE spectra of the bright rapidly oscillating Ap star α Cir A reveal large flux variations from 1600 to 2000 Å over the 4.4790 day rotational period. At 1965 Å, where the flux reaches a maximum, the flux more than doubles between phases of maximum and minimum flux. These large flux variations are most likely caused by the passage of spots or belts of overabundant elements in the line of sight as the star rotates. The FUSE spectrum of α Cir B, the K5V dwarf close to α Cir A, contains several emission lines of O vi, C iii and C ii which are probably formed in the transition region and the chromosphere of this star. The O vi lines completely disappear over a timescale of a few days which probably reflects rotationaly modulated magnetic activity.
Spectral Emission Features of SiO2 Spheres
Authors: Petrov Dmitry , Savushkin Alexander , Zhuzhulina Elena 
Published: September 2020

Abstract
Silicate dust particles are part of many astronomical objects such as comets and circumstellar discs. In the spectrum, silicates exhibit a number of characteristic emission features. In this paper, we studied the contribution of quartz (SiO2) particles to these features. Using the Mie theory, calculations were made of the intensity of light scattered by such particles. Two spectral features were found in the spectrum—near 9 μm and near 20.5 μm. The main properties of these features are investigated. It is established, that the 9 μm feature is much narrower than the 20.5 μm; with an increase in the size of the scattering particle from very small values the position of spectral features (both 9 μm and 20.5 μm) shifts toward longer wavelengths; the 9 μm feature cannot be clearly seen with particle sizes greater than 18 μm, while the 20.5 μm feature is apparent even at particle radius 60 μm.
Poursuivre le développement durable dans une ville chinoise. L’État local chinois et l’incertitude : un aperçu à partir du cas de Yangzhou
Authors: Romano Giulia C. 
Published: September 2020

Cet article interroge le cas du transfert de la « rénovation urbaine douce », une approche allemande de rénovation urbaine, à la ville de Yangzhou, en Chine. Combinant une analyse du transfert à celle de l’apprentissage, il montre que la configuration de l’État local chinois limite les capacités de la ville de poursuivre l’apprentissage et le transfert, laissant plutôt place à l’incertitude. Faute d’application des lois et des règlements, l’action du gouvernement local ne peut pas être prévisible. Il en résulte que les capacités de l’administration locale d’institutionnaliser cette approche de développement urbain durable sont limitées.
Efficacy of a Cycloplegic Agent Administered as a Spray in the Pediatric Population
Authors: Vagge Aldo , Del Noce Chiara , Pellegrini Marco , Cappelli Francesca , Musolino Maria , Bernabei Federico , Giannaccare Giuseppe , Traverso Carlo E. 
Published: September 2020

Purpose:
To evaluate the efficacy and tolerability of cyclopentolate 1% administered as a spray in pediatric patients between 3 and 6 years old.

Methods:
In this prospective, randomized, parallel group study, healthy volunteers were randomly assigned to receive cyclopentolate 1% as a single drop or a single puff into closed eyes.

Results:

There were 61 patients included in the study; 31 received cyclopentolate 1% as drops and 30 received cyclopentolate 1% as spray. The mean age at presentation was 4.5 ± 1.07 years (range: 3 to 6 years) and 4.2 ± 1.06 years (range: 3 to 6 years) in the drops and spray groups, respectively. The distress level was significantly lower at the time of receiving cyclopentolate as a spray (
P
< .0001), with the exception of patients aged 6 years. There were no significant differences in pupil diameter between the two groups (
P
= .51), whereas 5 of 30 patients (16.6%) with dark irises who received cyclopentolate spray did not have adequate cycloplegia to allow for accurate refraction.

Conclusions:
Cycloplegia achieved with cyclopentolate 1% administered as a spray may be an option in uncooperative children because it is less distressing compared to cyclopentolate 1% drops. However, physicians should be aware that cycloplegia obtained is only partially effective in children with dark irises.

[
J Pediatr Ophthalmol Strabismus
. 2020;57(5):301–304.]
Clinical Evaluation of Individualized and Navigated Microsecond Pulsing Laser for Acute Central Serous Chorioretinopathy
Authors: Volodin Pavel L. , Ivanova Elena V. 
Published: September 2020

BACKGROUND AND OBJECTIVE:
A computational model has predicted parameters for using a navigated microsecond pulsing laser system to treat central serous chorioretinopathy (CSC).

PATIENTS AND METHODS:
A prospective, single-center, interventional case series was conducted for patients with acute CSC who were enrolled following screening and informed consent. Treatment involved laser pulse duration of 50 μs, 2.4% Duty Cycle, 100 μm spot size, and 10 ms pulse duration.

RESULTS:
Average best-corrected visual acuity (decimal) of 12 patients improved from 0.86 ± 0.03 at baseline to 0.97 ± 0.01 at 3 months. Baseline central retinal thickness decreased from 452.58 μm ± 24.53 μm at baseline to 249.25 μm ± 2.92 μm at 3 months. Retinal sensitivity improved from 24.1 dB ± 1.09 dB at baseline to 28.98 dB ± 0.23 dB at 3 months. In all cases, subretinal fluid was resorbed.

CONCLUSION:
The parameter sets derived from the computer model can be applied safely and effectively for CSC treatment using the navigated microsecond pulsing laser system.

[
Ophthalmic Surg Lasers Imaging Retina
. 2020;51:512–520.]
Innovative Social Media Marketing Communication Application for Thai Hotel SMEs
Authors: Puangmaha Torboon , Taiphapoon Tatri , Vadhanasindhu Pakpachong , Sinthupinyo Sukree 
Published: September 2020

<p class="0abstract">Social media marketing communication has been widely adopted in organizations due to its values of interactivity, integration of communication channels, information collection and immediacy. Nevertheless, a majority of small and medium enterprises (SMEs) do not realize how to systematically and effectively implement social media marketing communication. In addition, few studies on application development of social media marketing communication have demonstrated the support for Thai hotel SMEs. This study aims to understand the pain points and expectations of SMEs in the Thai hotel industry, to design and develop an innovative social media marketing communication application for business promotion. The research utilizes design thinking process for application development using semi-structured interviews with 10 industry professionals. Based on results from the data analysis and conceptual prototype design, validated by group of professionals in business, innovation design and technology, the proposed prototype is practical and suitable for developing an innovative application that promotes Thai hotel SMEs’ social media marketing communication.</p>
Accuracy of Undergraduate Athletic Training Student Performance Factors for Determining Board of Certification Exam First-Time Pass Outcomes
Authors: Hobson Zachary Ryan , Miller Sayers John , Downs Danielle Symons , Vairo Giampietro Luciano 
Published: September 2020

Context
There is a lack of current evidence to help athletic training programs identify students poised for first-time Board of Certification (BOC) exam success as a means to ensure compliance with contemporary accreditation standards. Various academic variables have been previously identified as predictors of first-time success; however, these investigations reflect prior versions of the credentialing examination based on what are now obsolete editions of the professional practice analysis.

Objective
To determine the accuracy of undergraduate athletic training student performance factors as indicators of successfully passing the current version of the BOC exam on a first attempt.

Design
Casual-comparative (ex–post facto) quasi-experimental.

Setting
An accredited undergraduate athletic training program.

Patients or Other Participants
A recent sample of athletic training program graduates (n = 43).

Intervention(s)
Archived data were collected from student academic records and analyzed.

Main Outcome Measure(s)
Receiver operating characteristic curve analysis computed the area under the curve (AUC), which was used to determine accuracy of variables. Optimal thresholds for passing the BOC exam on a first attempt were computed for each variable by the index of union method.

Results
The AUC and associated thresholds for factors were as follows: cumulative grade point average (GPA) upon entry to the major (AUC = 0.67, threshold = 3.20); preprofessional-phase course GPA (AUC = 0.81, threshold = 3.48); averaged admission interview score (AUC = 0.49, threshold = 8.46); averaged preceptor evaluation of applicant score (AUC = 0.53, threshold = 93.88%); unique composite score (AUC = 0.80, threshold = 7.34); cumulative GPA upon graduation (AUC = 0.68, threshold = 3.19); combined math and reading SAT score (AUC = 0.90, threshold = 960); clinical education hours (AUC = 0.61, threshold = 1131.08).

Conclusions
Preprofessional-phase course GPA provided the greatest accuracy of the secondary admissions criteria; however, the combined math and reading SAT score provided the greatest accuracy of all examined variables. Furthermore, the unique composite score may represent an accurate, all-inclusive indicator of success. Program administrators and athletic training educators may use these outcomes to shape their related programmatic operations.