bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pressure Distortion of the H2–He Collision-induced Absorption at the Photosphere of Cool White Dwarf Stars
Authors: Blouin S. , Kowalski P. M. , Dufour P. 
Published: October 2017

Abstract
Collision-induced absorption (CIA) from molecular hydrogen is a dominant opacity source in the atmosphere of cool white dwarfs. It results in a significant flux depletion in the near-IR and IR parts of their spectra. Because of the extreme conditions of helium-rich atmospheres (where the density can be as high as a few g cm−3), this opacity source is expected to undergo strong pressure distortion and the currently used opacities have not been validated at such extreme conditions. To check the distortion of the CIA opacity, we applied state-of-the-art ab initio methods of computational quantum chemistry to simulate the CIA opacity at high densities. The results show that the CIA profiles are significantly distorted above densities of

in a way that is not captured by the existing models. The roto-translational band is enhanced and shifted to higher frequencies as an effect of the decrease of the interatomic separation of the H2 molecule. The vibrational band is blueward shifted and split into Q

R
and Q

P
branches, separated by a pronounced interference dip. Its intensity is also substantially reduced. The distortions result in a shift of the maximum of the absorption from 2.3 μm to 3–7 μm, which could potentially explain the spectra of some very cool, helium-rich white dwarfs.
Spatially Resolved Spectroscopy of Narrow-line Seyfert 1 Host Galaxies
Authors: Scharwächter J. , Husemann B. , Busch G. , Komossa S. , Dopita M. A. 
Published: October 2017

Abstract
We present optical integral field spectroscopy for five

narrow-line Seyfert 1 (NLS1) galaxies, probing their host galaxies at

scales. Emission lines from the active galactic nucleus (AGN) and the large-scale host galaxy are analyzed separately, based on an AGN–host decomposition technique. The host galaxy gas kinematics indicates large-scale gas rotation in all five sources. At the probed scales of

, the host galaxy gas is found to be predominantly ionized by star formation without any evidence of a strong AGN contribution. None of the five objects shows specific star formation rates (SFRs) exceeding the main sequence of low-redshift star-forming galaxies. The specific SFRs for MCG-05-01-013 and WPVS 007 are roughly consistent with the main sequence, while ESO 399-IG20, MS 22549-3712, and TON S180 show lower specific SFRs, intermediate to the main sequence and the red quiescent galaxies. The host galaxy metallicities, derived for the two sources with sufficient data quality (ESO 399-IG20 and MCG-05-01-013), indicate central oxygen abundances just below the low-redshift mass–metallicity relation. Based on this initial case study, we outline a comparison of AGN and host galaxy parameters as a starting point for future extended NLS1 studies with similar methods.
A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars within 30 pc
Authors: Hinkel Natalie R. , Mamajek Eric E. , Turnbull Margaret C. , Osby Ella , Shkolnik Evgenya L. , Smith Graeme H. , Klimasewski Alexis , Somers Garrett , Desch Steven J. 
Published: October 2017

Abstract
Almost every star in our Galaxy is likely to harbor a terrestrial planet, but accurate measurements of an exoplanet’s mass and radius demand accurate knowledge of the properties of its host star. The imminent TESS and CHEOPS missions are slated to discover thousands of new exoplanets. Along with WFIRST, which will directly image nearby planets, these surveys make urgent the need to better characterize stars in the nearby solar neighborhood (<30 pc). We have compiled the CATalog of Stellar Unified Properties (CATSUP) for 951 stars, including such data as: Gaia astrometry; multiplicity within stellar systems; stellar elemental abundance measurements; standardized spectral types; Ca ii H and K stellar activity indices; GALEX NUV and FUV photometry; and X-ray fluxes and luminosities from ROSAT, XMM, and Chandra. We use this data-rich catalog to find correlations, especially between stellar emission indices, colors, and galactic velocity. Additionally, we demonstrate that thick-disk stars in the sample are generally older, have lower activity, and have higher velocities normal to the galactic plane. We anticipate that CATSUP will be useful for discerning other trends among stars within the nearby solar neighborhood, for comparing thin-disk versus thick-disk stars, for comparing stars with and without planets, and for finding correlations between chemical and kinematic properties.
Star Formation, Supernovae, Iron, and α: Consistent Cosmic and Galactic Histories
Authors: Maoz Dan , Graur Or 
Published: October 2017

Abstract
Recent versions of the observed cosmic star formation history (SFH) have resolved an inconsistency with the stellar mass density history. We show that the revised SFH also scales up the delay-time distribution (DTD) of Type Ia supernovae (SNe Ia), as determined from the observed volumetric SN Ia rate history, aligning it with other field-galaxy SN Ia DTD measurements. The revised-SFH-based DTD has a

form and a Hubble-time-integrated production efficiency of

SNe Ia per

of formed stellar mass. Using these revised histories and updated empirical iron yields of the various SN types, we re-derive the cosmic iron accumulation history. Core-collapse SNe and SNe Ia have contributed about equally to the total mass of iron in the universe today. We find the track of the average cosmic gas element in the [α/Fe] versus [Fe/H] abundance-ratio plane. The track is broadly similar to the observed main locus of Galactic stars in this plane, indicating a Milky Way (MW) SFH similar in form to the cosmic one. We easily find a simple MW SFH that makes the track closely match this stellar locus. Galaxy clusters appear to have a higher-normalization DTD. This cluster DTD, combined with a short-burst MW SFH peaked at z = 3, produces a track that matches remarkably well the observed “high-α” locus of MW stars, suggesting the halo/thick-disk population has had a galaxy-cluster-like formation mode. Thus, a simple two-component SFH, combined with empirical DTDs and SN iron yields, suffices to closely reproduce the MW’s stellar abundance patterns.
Expansion of Magnetic Neutron Stars in an Energy (in)Dependent Spacetime
Authors: Panah B. Eslam , Bordbar G. H. , Hendi S. H. , Ruffini R. , Rezaei Z. , Moradi R. 
Published: October 2017

Abstract
Regarding the strong magnetic field of neutron stars and the high-energy regime scenario that is based on the high-curvature region near the compact objects, one is motivated to study magnetic neutron stars in an energy-dependent spacetime. In this paper, we show that such a strong magnetic field and energy dependency of spacetime have considerable effects on the properties of neutron stars. We examine the variations of maximum mass and related radius, Schwarzschild radius, average density, gravitational redshift, Kretschmann scalar, and Buchdahl theorem due to the magnetic field and energy dependency of the metric. First, it will be shown that the maximum mass and radius of neutron stars are increasing functions of the magnetic field, while average density, redshift, strength of gravity, and Kretschmann scalar are decreasing functions of it. These results are due to a repulsive-like force behavior for the magnetic field. Next, the effects of gravity’s rainbow will be studied, and it will be shown that by increasing the rainbow function, the neutron stars could enjoy an expansion in their structures. Then, we obtain a new relation for the upper mass limit of a static spherical neutron star with uniform density in gravity’s rainbow (Buchdahl limit) in which such an upper limit is modified as

. In addition, stability and energy conditions for the equation of state of neutron star matter are investigated, and a comparison with empirical results is done. It is notable that the numerical study in this paper is conducted by using the lowest-order constrained variational approach in the presence of a magnetic field employing AV
18 potential.
Emulating Simulations of Cosmic Dawn for 21 cm Power Spectrum Constraints on Cosmology, Reionization, and X-Ray Heating
Authors: Kern Nicholas S. , Liu Adrian , Parsons Aaron R. , Mesinger Andrei , Greig Bradley 
Published: October 2017

Abstract
Current and upcoming radio interferometric experiments are aiming to make a statistical characterization of the high-redshift 21 cm fluctuation signal spanning the hydrogen reionization and X-ray heating epochs of the universe. However, connecting 21 cm statistics to the underlying physical parameters is complicated by the theoretical challenge of modeling the relevant physics at computational speeds quick enough to enable exploration of the high-dimensional and weakly constrained parameter space. In this work, we use machine learning algorithms to build a fast emulator that can accurately mimic an expensive simulation of the 21 cm signal across a wide parameter space. We embed our emulator within a Markov Chain Monte Carlo framework in order to perform Bayesian parameter constraints over a large number of model parameters, including those that govern the Epoch of Reionization, the Epoch of X-ray Heating, and cosmology. As a worked example, we use our emulator to present an updated parameter constraint forecast for the Hydrogen Epoch of Reionization Array experiment, showing that its characterization of a fiducial 21 cm power spectrum will considerably narrow the allowed parameter space of reionization and heating parameters, and could help strengthen Planck's constraints on

. We provide both our generalized emulator code and its implementation specifically for 21 cm parameter constraints as publicly available software.
Measurements of Physical Parameters of White Dwarfs: A Test of the Mass–Radius Relation
Authors: Bédard A. , Bergeron P. , Fontaine G. 
Published: October 2017

Abstract
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techniques, and then to test the theoretical mass–radius relation for white dwarfs using these results. The agreement between spectroscopic and photometric parameters is found to be excellent, especially for effective temperatures, showing that our model atmospheres and fitting procedures provide an accurate, internally consistent analysis. The values of surface gravity and solid angle obtained, respectively, from spectroscopy and photometry, are combined with parallax measurements in various ways to study the validity of the mass–radius relation from an empirical point of view. After a thorough examination of our results, we find that 73% and 92% of the white dwarfs are consistent within 1σ and 2σ confidence levels, respectively, with the predictions of the mass–radius relation, thus providing strong support to the theory of stellar degeneracy. Our analysis also allows us to identify 15 stars that are better interpreted in terms of unresolved double degenerate binaries. Atmospheric parameters for both components in these binary systems are obtained using a novel approach. We further identify a few white dwarfs that are possibly composed of an iron core rather than a carbon/oxygen core, since they are consistent with Fe-core evolutionary models.
Electromagnetic Forces on a Relativistic Spacecraft in the Interstellar Medium
Authors: Hoang Thiem , Loeb Abraham 
Published: October 2017

Abstract
A relativistic spacecraft of the type envisioned by the Breakthrough Starshot initiative will inevitably become charged through collisions with interstellar particles and UV photons. Interstellar magnetic fields would therefore deflect the trajectory of the spacecraft. We calculate the expected deflection for typical interstellar conditions. We also find that the charge distribution of the spacecraft is asymmetric, producing an electric dipole moment. The interaction between the moving electric dipole and the interstellar magnetic field is found to produce a large torque, which can result in fast oscillation of the spacecraft around the axis perpendicular to the direction of motion, with a period of ∼0.5 hr. We then study the spacecraft rotation arising from impulsive torques by dust bombardment. Finally, we discuss the effect of the spacecraft rotation and suggest several methods to mitigate it.
Precessing Jet and Large Dust Grains in the V380 Ori NE Star-forming Region
Authors: Choi Minho , Kang Miju , Lee Jeong-Eun , Tatematsu Ken’ichi , Kang Sung-Ju , Sayers Jack , Evans II Neal J. , Cho Jungyeon , Kwon Jungmi , Park Geumsook , Ohashi Satoshi , Yoo Hyunju , Lee Youngung 
Published: October 2017

Abstract
The V380 Ori NE bipolar outflow was imaged in the SiO and CO

lines, and dense cores in L1641 were observed in the 2.0–0.89 mm continuum. The highly collimated SiO jet shows point-symmetric oscillation patterns in both position and velocity, which suggests that the jet axis is precessing and the driving source may belong to a non-coplanar binary system. By considering the position and velocity variabilities together, accurate jet parameters were derived. The protostellar system is viewed nearly edge-on, and the jet has a flow speed of ∼35 km s−1 and a precession period of ∼1600 years. The CO outflow length gives a dynamical timescale of ∼6300 years, and the protostar must be extremely young. The inferred binary separation of 6–70 au implies that this protobinary system may have been formed through the disk instability process. The continuum spectra of L1641 dense cores indicate that the emission comes from dust, and the fits with modified blackbody functions give emissivity power indices of β = 0.3–2.2. The emissivity index shows a positive correlation with the molecular line width, but no strong correlation with bolometric luminosity or temperature. V380 Ori NE has a particularly low value of β = 0.3, which tentatively suggests the presence of millimeter-sized dust grains. Because the dust growth takes millions of years, much longer than the protostellar age, this core may have produced large grains in the starless core stage. HH 34 MMS and HH 147 MMS also have low emissivity indices.
A reciclagem do lixo urbano como fonte de renda, e a preservação dos recursos naturais e ambientais
Authors: Nascimento Alair Ambrósio do , Oliveira Rafael Jesus de , De Menezes José Elmo 
Published: October 2017

Este estudo tem por objetivo discutir os impactos sociais e de renda causados pela reciclagem do lixo urbano na cidade de Goiânia, a partir da reutilização da matéria prima aplicada na elaboração de novos produtos próprios para o consumo humano, e os benefícios causados ao meio ambiente com a preservação das fontes de recursos naturais, e a redução da disposição inadequada do lixo no solo. O trabalho pesquisou a atuação das cooperativas de catadores de materiais recicláveis sob os seguintes aspectos: estrutura física das cooperativas, as condições de trabalho dos cooperados, a formação das cooperativas em redes, as parcerias firmadas com poder público municipal, os aspectos documental e legal. A pesquisa utilizada foi de natureza exploratória qualitativa e quantitativa, o universo de atores entrevistados foi composto por membros da Prefeitura Municipal de Goiânia, como representantes da Agencia Municipal do Meio Ambiente (AMMA), e da Companhia de Urbanização de Goiânia (COMURG), Membro da Incubadora Social da Universidade Federal de Goiás (UFG), e representantes das quatorze cooperativas de catadores de materiais recicláveis cadastradas pela Prefeitura Municipal de Goiânia.
Planejamento estratégico situacional: o caso da incubadora de bases biotecnológica da UFT
Authors: Rodrigues Waldecy , Mota Sobrinho Alexsandro , Cançado Airton Cardoso , Castro Fabiula 
Published: October 2017

A pesquisa objetiva aplicar o Planejamento Estratégico Situacional (PES) na dinamização da incubadora de base biotecnológica da Universidade Federal do Tocantins (UFT) no Campus Gurupi. Para tanto, apresenta a metodologia PES e faz também uma discussão acerca de sua implementação e os principais resultados das ações estratégicas desenvolvidas. Com a aplicação do método foi possível diagnosticar os principais pontos críticos da Incubadora e propor soluções estruturadas para sua solução. Por fim, pode-se concluir que o PES se apresenta como uma técnica de planejamento bastante valiosa e com grande potencial para o desenvolvimento prático em organizações públicas flexíveis e adaptativas como foi o caso deste estudo.
The Treatment of Congenital Nasolacrimal Duct Obstruction in Children: A Retrospective Review
Authors: Eustis H. Sprague , Nguyen An H. 
Published: October 2017

Purpose:
To compare success and extrusion rates of the monocanalicular and bicanalicular Crawford intubation systems (JEDMED Instrument Company, St. Louis, MO).

Methods:
A retrospective review of all children who were diagnosed as having congenital nasolacrimal duct obstruction and treated with lacrimal intubation from 2005 to 2014 was performed. The total number of eyes included was 168 (75 and 93 right and left eyes, respectively). Bicanalicular intubation was used in 80 eyes (bicanalicular group) and monocanalicular intubation was used in 88 eyes (monocanalicular group).

Results:

Success occurred in 63 (78.75%) and 82 (93.18%) eyes in the bicanalicular and monocanalicular groups, respectively (
P
= .00653). Extrusion occurred in 24 (30%) and 11 (12.5%) eyes, respectively (
P
= .00528).

Conclusions:
Monocanalicular intubation for congenital nasolacrimal duct obstruction is superior to bicanalicular intubation. Extrusion and reoperation rates are significantly lower.

[
J Pediatr Ophthalmol Strabismus
. 2018;55(1):65–67.]
The Efficacy of Bilateral Lateral Rectus Recession According to Secondary Deviation Measurements in Unilateral Exotropic Duane Retraction Syndrome
Authors: Mezad-Koursh Daphna , Leshno Ari , Klein Ainat , Stolovich Chaim 
Published: October 2017

Purpose:
To evaluate the surgical results of asymmetric bilateral lateral rectus recession in exotropic Duane retraction syndrome with abnormal face turn toward the opposite side according to secondary deviation measurements.

Methods:
Retrospective chart review.

Results:

Seven cases of unilateral exotropic Duane retraction syndrome were reviewed. All cases had globe retraction on adduction and exotropia with limited adduction, five of which also had mild limitation of abduction. Four cases had upshoot/downshoot on adduction and all patients had face turn. Exotropia was measured in forced primary position. The average lateral rectus recession was 6.36 mm (range: 5.5 to 7.5 mm) in the affected eye and 7.36 mm (range: 6.5 to 8.5 mm) in the healthy eye. The mean follow-up period was 282 days. Mean exotropia in the forced primary position improved from 27.9 ± 5.7 prism diopters (PD) preoperatively to 7.9 ± 16.8 PD postoperatively (
P
= .025). Head position resolved completely in all but one case (
P
=.031). There were no significant changes in ductions.

Conclusions:
The results suggest that asymmetric bilateral lateral rectus recession in exotropic Duane retraction syndrome with abnormal head turn posture successfully eliminates abnormal head turn posture and exotropia in most cases.

[
J Pediatr Ophthalmol Strabismus
. 2018;55(1):47–52.]
Endophthalmitis Following Pediatric Cataract Surgery: An International Pediatric Ophthalmology and Strabismus Council Global Perspective
Authors: Gharaibeh Almutez M. , Mezer Eedy , Ospina Luis H. , Wygnanski-Jaffe Tamara 
Published: October 2017

Purpose:
To compile international data on the risk factors, diagnosis, and treatment of endophthalmitis following pediatric cataract surgery.

Methods:
An e-mail containing a link to an online survey was sent to all members of the American Association for Pediatric Ophthalmology and Strabismus. The questionnaire examined the incidence, risk factors, treatment, outcomes, and prophylaxis of endophthalmitis following pediatric cataract surgery around the world.

Results:

Two hundred thirty-seven ophthalmologists answered the questionnaire. Eight ophthalmologists (3.4%) encountered 22 cases of endophthalmitis following pediatric cataract surgery during their practice. Most patients with endophthalmitis following pediatric cataract surgery were 2 to 4 years of age (36.4%). An intraocular lens was implanted in 59.1% of cases, most of which were acrylic intraocular lenses (53.8%). The main presenting symptoms were photophobia (50%) and pain (40.9%). The most common signs were conjunctival injection (36.4%) and hypopyon (31.8%). The final visual acuity was counting fingers or worse in 86% of cases. The most common cultured organism was
Staphylococcus aureus
(31.8%). The most common management of endophthalmitis following pediatric cataract surgery was a combination of intravitreal, systemic, and topical antibiotics (36.4%). Most ophthalmologists (68.2%) administered prophylactic intracameral antibiotic treatment during surgery and 50% used vancomycin.

Conclusions:
Endophthalmitis following pediatric cataract surgery is an uncommon, multifactorial complication with poor visual prognosis. Efforts directed at minimizing its risk, such as treating potential predisposing systemic conditions, improving sterilization techniques, optimizing operative conditions to reduce complications and surgery duration, and using subconjunctival and intracameral antibiotics, decrease its incidence. Early postoperative evaluation, subsequent follow-up visits, and keeping a high index of suspicion should facilitate the recognition of endophthalmitis following pediatric cataract surgery to avoid delaying treatment.

[
J Pediatr Ophthalmol Strabismus
. 2018;55(1):23–29.]
Visual Performance With Bifocal and Trifocal Diffractive Intraocular Lenses: A Prospective Three-Armed Randomized Multicenter Clinical Trial
Authors: Kaymak Hakan , Breyer Detlev , Alió Jorge L. , Cochener Beatrice 
Published: October 2017

PURPOSE:
To evaluate and compare quality of vision and reading performance outcomes after implantation of bifocal refractive-diffractive, bifocal apodized diffractive, or trifocal diffractive-refractive intraocular lenses (IOLs).

METHODS:
This randomized, prospective, three-armed multicenter (Spain, Germany, and France) trial included 104 eyes of 52 patients (mean age: 63.2 ± 7.7 years). Patients underwent cataract surgery with bilateral implantation of either AT LISA 809M (Carl Zeiss Meditec, Jena, Germany: AT LISA group, 38 eyes), AT LISA tri 839MP (Carl Zeiss Meditec: AT LISA tri group, 32 eyes), or ReSTOR SN6AD1 (Alcon Laboratories, Inc., Fort Worth, TX: ReSTOR group, 34 eyes) IOLs. Visual and refractive outcomes, depth of focus, and reading performance were evaluated at 1, 6, and 12 months postoperatively.

RESULTS:

The AT LISA tri group showed significantly better 12-month uncorrected (UIVA) and binocular distance-corrected (DCIVA) intermediate visual acuity (
P
≤ .016) than the AT LISA group. The AT LISA tri group showed a significantly better 3-month UIVA compared to the ReSTOR group (
P
= .042). Binocular uncorrected and corrected distance visual acuities were not significantly different among groups (
P
≥ .092) at the 12-month follow-up. A total of 85.3%, 90.0%, and 78.1% of eyes had a spherical equivalent within ±0.50 D in the AT LISA, AT LISA tri, and ReSTOR groups, respectively, at 12 months (
P
= .038). No statistically significant differences between the trifocal and bifocal groups were detected for reading performance (
P
≥ .055).

CONCLUSIONS:
The trifocal diffractive-refractive IOL provides enhanced intermediate visual restoration compared to bifocal diffractive-refractive or apodized diffractive IOLs. The addition of an intermediate focal point did not deteriorate far or near vision. A comparable reading performance was maintained with the trifocal lens.

[
J Refract Surg.
2017;33(10):655–662.]