bluuebunny/crossref_metadata_2025_split huggingface dataset:
Giant splenic artery aneurysm with pancreatic involvement
Authors: Gómez Sánchez J , de Castro Monedero P , Rubio López J , Álvarez Conde JL 
Published: September 2020

Resumen

Los aneurismas de la arteria esplénica son los aneurismas viscerales más frecuentes. Suelen ser asintomáticos y su diagnóstico es con frecuencia incidental. Aparecen con mayor proporción en el sexo femenino y su complicación más grave y potencialmente mortal es la rotura espontánea. La aparición de aneurismas gigantes es extremadamente rara, pero en ocasiones, su tamaño y su localización anatómica producen la aparición de síntomas compresivos que requieren de tratamiento quirúrgico. A continuación describimos la imagen y clínica de un aneurisma gigante esplénico con afectación pancreática.
Bouveret's syndrome: an unusual cause of duodenal obstruction.
Authors: Alcaide Lucena M , Zurita Saavedra MS , Hernández García MD , Mirón Pozo B 
Published: September 2020

Resumen

El Síndrome de Bouveret es una causa infrecuente de íleo biliar manifestada como obstrucción gástrica secundaria al impacto de un cálculo en el duodeno, debido a una fístula colecistoduodenal o coledocoduodenal. El tratamiento es quirúrgico, aunque existen controversias en la literatura en cuanto a resolver únicamente la obstrucción, o tratar en el mismo acto la fístula. Presentamos el caso de una paciente de 78 años tratada recientemente en nuestro centro.
The Near-infrared Spectrum of the Nuclear Star Cluster: Looking below the Tip of the Iceberg, and Comparisons with Extragalactic Nuclei*
Authors: Davidge T. J. 
Published: September 2020

Abstract
Long-slit near-infrared (NIR) spectra of the Galactic nuclear star cluster (NSC) are discussed. The spectra sample the major axis of the NSC out to its half-light radius. The absorption spectrum of the central regions of the NSC is averaged over angular scales of tens of arc seconds in order to sample globular cluster-like total luminosities, and the results are compared with model spectra. The equivalent widths of Na i2.21 μm and Ca 2.26 μm outside of the center of the NSC, where light from nuclear bulge stars contributes a large fraction to the total flux, are consistent with solar chemical mixtures. In contrast, the equivalent widths of Na i2.21 μm and Ca i2.26 μm near the center of the NSC are larger than expected from models with solar chemical mixtures, even after light from the brightest evolved stars is removed. The depths of spectroscopic features changing along the major axis of the NSC are consistent with imaging studies that have found evidence of population gradients in the NSC. That Na i2.21 μm and Ca i2.26 μm are deeper than predicted for solar chemical mixtures over a range of evolutionary states is consistent with previous studies that find that the majority of stars near the center of the NSC formed from material that had nonsolar chemical mixtures. The depths of the Na i2.21 μm and Ca i2.26 μm features in the central regions of the NSC are comparable to those in the nuclear spectrum of the early-type Virgo disk galaxy NGC 4491, and are deeper than in the central spectra of NGC 253 and 7793. A spectrum of nebular emission and the youngest stars near the galactic center is also extracted. The equivalent widths of emission features in the extracted NIR spectrum are similar to those in the nuclear spectrum of NGC 253, and it is argued that this agreement is best achieved if the current episode of star formation near the center of the NSC has been in progress for at least a few megayears.
On the Chemical Abundance of HR 8799 and the Planet c
Authors: Wang 王 Ji 吉 , Wang 王劲 Jason J. 飞 , Ma Bo , Chilcote Jeffrey , Ertel Steve , Guyon Olivier , Ilyin Ilya , Jovanovic Nemanja , Kalas Paul , Lozi Julien , Macintosh Bruce , Strassmeier Klaus G. , Stone Jordan 
Published: September 2020

Abstract
Comparing chemical abundances of a planet and the host star reveals the origin and formation pathway of the planet. Stellar abundance is measured with high-resolution spectroscopy. Planet abundance, on the other hand, is usually inferred from low-resolution data. For directly imaged exoplanets, the data are available from a slew of high-contrast imaging/spectroscopy instruments. Here, we study the chemical abundance of HR 8799 and its planet c. We measure stellar abundance using LBT/PEPSI (R = 120,000) and archival HARPS data: stellar [C/H], [O/H], and C/O are 0.11 ± 0.12, 0.12 ± 0.14, and

, all consistent with solar values. We conduct atmospheric retrieval using newly obtained Subaru/CHARIS data together with archival Gemini/GPI and Keck/OSIRIS data. We model the planet spectrum with petitRADTRANS and conduct retrieval using PyMultiNest. Retrieved planetary abundance can vary by ∼0.5 dex, from sub-stellar to stellar C and O abundances. The variation depends on whether strong priors are chosen to ensure a reasonable planet mass. Moreover, comparison with previous works also reveals inconsistency in abundance measurements. We discuss potential issues that can cause the inconsistency, e.g., systematics in individual data sets and different assumptions in the physics and chemistry in retrieval. We conclude that no robust retrieval can be obtained unless the issues are fully resolved.
A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder
Authors: Cañas Caleb I. , Stefansson Gudmundur , Kanodia Shubham , Mahadevan Suvrath , Cochran William D. , Endl Michael , Robertson Paul , Bender Chad F. , Ninan Joe P. , Beard Corey , Lubin Jack , Gupta Arvind F. , Everett Mark E. , Monson Andrew , Wilson Robert F. , Lewis Hannah M. , Brewer Mary , Majewski Steven R. , Hebb Leslie , Dawson Rebekah I. , Diddams Scott A. , Ford Eric B. , Fredrick Connor , Halverson Samuel , Hearty Fred , Lin Andrea S. J. , Metcalf Andrew J. , Rajagopal Jayadev , Ramsey Lawrence W. , Roy Arpita , Schwab Christian , Terrien Ryan C. , Wright Jason T. 
Published: September 2020

Abstract
We confirm the planetary nature of a warm Jupiter transiting the early M dwarf TOI-1899 using a combination of available TESS photometry; high-precision, near-infrared spectroscopy with the Habitable-zone Planet Finder; and speckle and adaptive optics imaging. The data reveal a transiting companion on an ∼29 day orbit with a mass and radius of

and

, respectively. The star, TOI-1899, is the lowest-mass star known to host a transiting warm Jupiter, and we discuss the follow-up opportunities afforded by a warm (

K) gas giant orbiting an M0 star. Our observations reveal that TOI-1899.01 is a puffy warm Jupiter, and we suggest additional transit observations to both refine the orbit and constrain the true dilution observed in TESS.
A Chandra X-Ray Survey of Optically Selected AGN Pairs
Authors: Hou Meicun , Li Zhiyuan , Liu Xin 
Published: September 2020

Abstract
We present a Chandra archival study of optically selected active galactic nucleus (AGN) pairs at a median redshift

. Out of 1286 AGN pairs (with projected separations r

p
< 100 kpc and velocity offsets Δv < 600 km s−1) optically identified from the Sloan Digital Sky Survey Seventh Data Release, we find 67 systems with archival Chandra observations, which represents the largest sample of optically selected AGN pairs studied in the X-ray. Among the 67 AGN pairs, 21 systems have both nuclei detected in the X-ray, 36 have one nucleus detected in the X-ray, and 10 have no X-ray detection. The X-ray detection rate, 78/134 = 58% (±7% 1σ Poisson errors), is significantly higher than that (23/134 = 17% ± 4%) of a comparison sample of star-forming galaxy pairs, lending support to the optical AGN classification. In the conservative case where X-ray contamination from star formation is removed, the X-ray detection rate becomes 27% ± 4%, consistent with predictions from the latest galaxy merger simulations. The 2–10 keV X-ray luminosity L
2–10 keV increases with decreasing projected separation in AGN pairs for r

p
≳ 15 kpc, suggesting an enhancement of black hole accretion even in early-stage mergers. On the other hand, L
2–10 keV appears to decrease with decreasing projected separation at r

p
≲15 kpc, which is contradictory to predictions from merger simulations. The apparent decrease in L
2–10 keV of AGN pairs at r

p
≲ 15 kpc may be caused by (i) enhanced absorbing columns from merger-induced gas inflows, (ii) feedback effects from early-stage mergers, and/or (iii) small number statistics. Future X-ray studies with larger samples are needed to put our results on firmer statistical ground.
Statistical Analysis of the Relation between Coronal Mass Ejections and Solar Energetic Particles
Authors: Kihara Kosuke , Huang Yuwei , Nishimura Nobuhiko , Nitta Nariaki V. , Yashiro Seiji , Ichimoto Kiyoshi , Asai Ayumi 
Published: September 2020

Abstract
To improve the forecasting capability of impactful solar energetic particle (SEP) events, the relation between coronal mass ejections (CMEs) and SEP events needs to be better understood. Here we present a statistical study of SEP occurrences and timescales with respect to the CME source locations and speeds, considering all 257 fast (v
CME ≥ 900 km s−1) and wide (angular width ≥60°) CMEs that occurred between 2006 December and 2017 October. We associate them with SEP events at energies above 10 MeV. Examination of the source region of each CME reveals that CMEs more often accompany a SEP event if they originate from the longitude of E20–W100 relative to the observer. However, an SEP event could still be absent if the CME is <2000 km s−1. For the associated CME–SEP pairs, we compute three timescales for each of the SEP events, namely the timescale of the onset (TO), the rise time (TR), and the duration (TD). They are correlated with the longitude of the CME source region relative to the footpoint of the Parker spiral (ΔΦ) and v
CME. The TO tends to be short for

60°. This trend is weaker for TR and TD. The SEP timescales are only weakly correlated with v
CME. Positive correlations of both TR and TD with v
CME are seen in poorly connected (large

) events. Additionally, TO appears to be negatively correlated with v
CME for events with small

.
Kinetic Simulations of the Jovian Energetic Ion Circulation around Ganymede
Authors: Plainaki Christina , Massetti Stefano , Jia Xianzhe , Mura Alessandro , Milillo Anna , Grassi Davide , Sindoni Giuseppe , D’Aversa Emiliano , Filacchione Gianrico 
Published: September 2020

Abstract
The temporal and spatial variability of the radiation environment around Ganymede has a direct impact on the moon’s exosphere, which links Jupiter’s magnetosphere with the satellite’s icy surface. The dynamics of the entry and circulation inside Ganymede’s magnetosphere of the Jovian energetic ions, as well as the morphology of their precipitation on the moon’s surface, determine the variability of the sputtered-water release. For this reason, the so-called planetary space weather conditions around Ganymede can also have a long-term impact on the weathering history of the moon’s surface. In this work, we simulate the Jovian energetic ion precipitation to Ganymede’s surface for different relative configurations between the moon’s magnetic field and Jupiter’s plasma sheet using a single-particle Monte Carlo model driven by the electromagnetic fields from a global MHD model. In particular, we study three science cases characterized by conditions similar to those encountered during the NASA Galileo G2, G8, and G28 flybys of Ganymede (i.e., when the moon was above, inside, and below the center of Jupiter’s plasma sheet). We discuss the differences between the various surface precipitation patterns and the implications in the water sputtering rate. The results of this preliminary analysis are relevant to ESA’s JUICE mission and in particular to the planning and optimization of future observation strategies for studying Ganymede’s environment.
Comparative Spectral Analysis of the Superluminous Supernova 2019neq
Authors: Könyves-Tóth Réka , Thomas Benjamin P. , Vinkó József , Wheeler J. Craig 
Published: September 2020

Abstract
We present a spectroscopic analysis of the recently discovered fast-evolving Type I superluminous supernova (SLSN-I) SN 2019neq (at redshift z = 0.1059). We compare it to the well-studied slowly evolving SLSN-I SN 2010kd (z = 0.101). Our main goal is to search for spectroscopic differences between the two groups of SLSNe-I. Differences in the spectra may reveal different ejecta compositions and explosion mechanisms. Our investigation concentrates on optical spectra observed with the 10 m Hobby–Eberly Telescope Low Resolution Spectrograph-2 at McDonald Observatory during the photospheric phase. We apply the SYN++ code to model the spectra of SN 2019neq taken at −4 days, +5 days, and +29 days from maximum light. We examine the chemical evolution and ejecta composition of the SLSN by identifying the elements and ionization states in its spectra. We find that a spectral model consisting of O iii, Co iii, and Si iv gives a SYN++ fit that is comparable to the typical SLSN-I spectral model consisting of O ii, and conclude that the true identification of those lines, at least in the case of SN 2019neq, is ambiguous. Based on modeling the entire optical spectrum, we classify SN 2019neq as a fast-evolving SLSN-I having a photospheric velocity gradient of

km s−1 day−1, which is among the highest velocity gradients observed for an SLSN-I. Inferring the velocity gradient from the proposed Fe ii
λ5169 feature alone would result in

km s−1 day−1, which is still within the observed range of fast-evolving SLSNe-I. In addition, we derive the number density of relevant ionization states for a variety of identified elements at the epoch of the three observations. Finally, we give constraints on the lower limit of the ejecta mass and find that both SLSNe have an ejecta mass at least one order of magnitude higher than normal SNe Ia, while the fast-evolving SN 2019neq has an ejecta mass a factor of two lower than the slowly evolving SN 2010kd. These mass estimates suggest the existence of a possible correlation between the evolution timescale and the ejected mass of SLSNe-I.
La fabrique d’un révolutionnaire, Otto Wilhelm Kuusinen (1881-1918)
Authors: Carrez Maurice 
Published: September 2020

Otto Wilhelm Kuusinen est surtout connu pour avoir été pendant quinze ans l’un des secrétaires du Komintern, puis plus tard l’un des conseillers de Nikita Krouchtchev. En Finlande même, il incarne pour beaucoup la figure par excellence d’un communisme apatride, lié à « l’ennemi héréditaire ». Il fut pourtant de 1905 à 1918 un dirigeant social démocrate finlandais de premier plan, qui plus est patriote ardent et rédacteur de maints textes réclamant ou préparant l’indépendance du pays en 1917.

Le présent ouvrage s’intéresse spécifiquement à cette partie-là de la vie de Kuusinen, non seulement parce qu’elle est souvent occultée, voire négligée par les historiens, mais aussi parce qu’elle pose le problème des continuités et des ruptures dans la vie d’un dirigeant du mouvement ouvrier dont la carrière a embrassé plusieurs époques distinctes.

Le but de ce livre n’est toutefois pas d’être simplement une biographie, au sens classique du terme. Il s’agit aussi dans ces pages de comprendre pourquoi un jeune homme, que rien ne prédisposait a priori à devenir un révolutionnaire, s’est découvert et forgé une âme de socialiste, pourquoi il a en outre abandonné ses rêves d’ascension sociale pour embrasser une carrière aléatoire au sein d’un mouvement ouvrier qui lui était à l’origine étranger. Les raisons en fait apparaissent complexes, mêlant des facteurs structurels et conjoncturels, familiaux et sociétaux, individuels et organisationnels. Au total, il apparaît que l’engagement politique, au sens que lui a donné le xxe siècle, ne peut se réduire aux choix d’une personne ; il a également une dimension collective qui l’enracine profondément dans la société qu’il prétend transformer.

C’est pourquoi le lecteur pourra découvrir, tout autant que l’individu Kuusinen, la Finlande des années 1881-1918, les mutations socio-économiques qui l’affectent, les débats intellectuels et politiques qui s’y déploient, les espérances et les colères qui animent les contemporains, la dureté enfin des conflits qui minent le Grand-Duché. Ainsi, il ne se sentira pas enfermé dans le cadre étroit d’une monographie ; il pourra respirer plus librement l’air du grand large, celui d’une zone baltique agitée de soubres-sauts multiples annonçant un avenir différent de celui que pouvaient alors imaginer ses habitants.
L’œil diagnostique
Authors: Pentimalli Barbara 
Published: September 2020

Cet article repose sur une recherche ethnographique menée dans un laboratoire d’hémodynamique d’un grand hôpital italien effectuant des coronographies et des angioplasties. En adoptant les approches des Social Studies of Scientific Imaging and Visualization et des Workplace Studies, il dévoile comment médecins, techniciens en radiologie et infirmiers apprennent et développent cet « œil diagnostique » capable de remarquer – à l’aide de technologies d’imagerie médicale – les indices suspects signalant une pathologie coronaire. L’article analyse aussi le parcours de l’ethnographe qui, côtoyant les professionnels, apprend progressivement à distinguer dans les images certains de ces éléments pertinents. On verra ainsi que la compétence à repérer les signes d’une pathologie repose sur un apprentissage pratique et situé pour interpréter non seulement ce qui se passe dans l’espace perceptuel de l’écran mais aussi dans l’espace interactionnel partagé avec les collègues en coprésence. Cela comporte en effet l’usage de ressources sémiotiques multimodales – instructions langagières, métaphores et jugements esthétiques, gestes de pointage, orientations du regard, manipulation d’artefacts – rendant mutuellement visibles et intelligibles les détails pertinents des ramifications du cœur apparaissant à l’écran.
(Sa)voir, voiler, valoir
Authors: Munz Hervé 
Published: September 2020

Comment exercer ou apprendre un métier alors que l’accès visuel à ses composantes est stratégiquement obstrué ou empêché par autrui ? Dans l’optique de répondre à cette question, le présent article s’intéresse à la formation du regard professionnel chez les horloger·ère·s de l’industrie des montres suisses. S’inscrivant dans la lignée de travaux en sciences humaines et sociales qui questionnent les rapports entre voir, savoir et appartenir, l’article examine la façon dont les horloger·ère·s acquièrent un certain regard expert en faisant l’expérience de problèmes de visibilité induits par des pratiques de voilement commises par des pairs (secrets, dissimulations, masquages mais également silences et non-dits). Sur la base de récits et d’observations collectés au cours d’une ethnographie de quatre années, menée avec des professionnel-le-s et des apprenti·e·s dans des entreprises, des écoles et des foires professionnelles de l’Arc jurassien suisse, l’article entend montrer que les voilements constituent certaines des modalités particulières par lesquelles le savoir voir des horloger·ère·s et le regard professionnel qu’il fonde, se façonnent, s’apprennent et se transmettent.
Expansion of SARS-CoV-2–Specific Antibody-Secreting Cells and Generation of Neutralizing Antibodies in Hospitalized COVID-19 Patients
Authors: Varnaitė Renata , García Marina , Glans Hedvig , Maleki Kimia T. , Sandberg John Tyler , Tynell Janne , Christ Wanda , Lagerqvist Nina , Asgeirsson Hilmir , Ljunggren Hans-Gustaf , Ahlén Gustaf , Frelin Lars , Sällberg Matti , Blom Kim , Klingström Jonas , Gredmark-Russ Sara 
Published: September 2020

Abstract
Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), emerged in late 2019 and has since become a global pandemic. Pathogen-specific Abs are typically a major predictor of protective immunity, yet human B cell and Ab responses during COVID-19 are not fully understood. In this study, we analyzed Ab-secreting cell and Ab responses in 20 hospitalized COVID-19 patients. The patients exhibited typical symptoms of COVID-19 and presented with reduced lymphocyte numbers and increased T cell and B cell activation. Importantly, we detected an expansion of SARS-CoV-2 nucleocapsid protein–specific Ab-secreting cells in all 20 COVID-19 patients using a multicolor FluoroSpot Assay. Out of the 20 patients, 16 had developed SARS-CoV-2–neutralizing Abs by the time of inclusion in the study. SARS-CoV-2–specific IgA, IgG, and IgM Ab levels positively correlated with SARS-CoV-2–neutralizing Ab titers, suggesting that SARS-CoV-2–specific Ab levels may reflect the titers of neutralizing Abs in COVID-19 patients during the acute phase of infection. Last, we showed that IL-6 and C-reactive protein serum concentrations were higher in patients who were hospitalized for longer, supporting the recent observations that IL-6 and C-reactive protein could be used as markers for COVID-19 severity. Altogether, this study constitutes a detailed description of clinical and immunological parameters in 20 COVID-19 patients, with a focus on B cell and Ab responses, and describes tools to study immune responses to SARS-CoV-2 infection and vaccination.
Foreign Direct Investment in Global Cities and Co-Ethnic Clusters: Characteristics, Profitability, and Survival
Authors: Chakravarty Dwarka 
Published: September 2020

While global cities such as New York, Los Angeles, and Toronto provide multinational enterprises (MNEs) with a range of economic, infrastructure, and ecosystem advantages, they also present significant cost and competitive challenges. I compare the characteristics, profitability, and survival of foreign subsidiaries between global cities, their metro areas, and other locations. I also consider the effect of co-ethnic and co-industry clusters. My sample comprises 2,863 subsidiaries of 1,605 Japanese MNEs in North America over the time period 1990-2013 and I apply a multilevel longitudinal analysis model. I discuss managerial implications for location choice to improve odds of profitability and survival.
Multilatinas and International Business Studies
Authors: Cuervo-Cazurra Alvaro 
Published: September 2020

I study Multilatinas, Latin American multinationals, and explain how their analysis helps provide new insights on internationalization. I propose that the historical commonalities among Latin American countries help control for influences that facilitate the analysis of the impact of the home country on internationalization in a way that is not possible when studying firms in other regions. I illustrate this idea explaining how internationalization is affected by geographic distance markets, by political influences on state-owned firms, by the size of the home market, and by the new middle classes in emerging economies.
Plus Ça Change, Plus C’est La Même Chose? Or, That Was Then, This Is Now!
Authors: Von Glinow Mary Ann 
Published: September 2020

The world is changing, thus, opening the opportunity for IB researchers to conduct vibrant and relevant research. But, are the changes taking us out of our ivory towers into the “abyss” or are we dangling on the edge of it? This paper appeals to researchers in IB to be attentive to the problems of today’s world (e.g. the poisoning of free trade, bans on immigration, a new rise in racism, and few laws protecting LGBT members) and how these problems create a fading “global community.” To focus on contemporary issues, changing journal article submissions and conducting a forum are proposed.