bluuebunny/crossref_metadata_2025_split huggingface dataset:
Desafíos de la educación y el aprendizaje en el Metaverso
Authors: Meyzan Briceño María Amparo 
Published: March 2022

La educación está ligada íntimamente al aprendizaje, aunque ambos tienen serias diferencias pero complementarias entre sí. Mientras que la educación es formativo, metodológico, de carácter rígido, cerrado o especializado donde se construye el proyecto de vida; el aprendizaje es flexible y está conectado para adquisición de habilidades, competencias y capacidades que generen rasgos de personalidad como autonomía, responsabilidad, estabilidad emocional, amabilidad, entre otros
Breast cancer patients with delayed radiotherapy during the pandemic process
Authors: ALTUNDAĞ Muzaffer Bedri , AZAK Can , ERTAŞ Gülçin , ATAR Cafer 
Published: March 2022

Aim: In this study; We wanted to examine the changes and delays in radiotherapy of all our breast cancer patients diagnosed with COVID-19
Material and Method: Radiotherapy delays of our breast cancer patients who had COVID-19 infection before and during radiotherapy between March 2020 and March 2021 were evaluated retrospectively.
Results: Sixteen of a total of 642 breast cancer patients, 472 operated and 165 metastatic, who underwent radiotherapy were diagnosed with COVID-19. All patients were women, ages were between 40 and 77 (mean 54.6). Five patients had a mastectomy, 8 had breast-conserving surgery, and 3 had breast cancer with bone metastases. Different radiotherapy schemes were applied at different treatment duration according to the clinical stage and disease status. The first breast cancer patient with COVID-19 infection was diagnosed on 27 June 2020. Our other patients were diagnosed from June to December (n=15) in 2020. Treatment of patients infected during radiotherapy was interrupted after a mean of 10 fractions (2-24 fractions) and treatment was started after a mean of 25 days (21-44 days). Post-operative patients who could not start treatment because they were SARS-CoV-2 PCR positive were able to start treatment after a mean of 22 days (14-30 days).
Conclusion: Radiotherapy could not be started at the recommended times for breast cancer patients infected with COVID-19 during the pandemic and the treatments had to be interrupted. Therefore, more care should be taken in the follow-up of these patients; should be considered as patients at risk for local recurrence and metastasis.
Changing profile of infective endocarditis during 31-year time course in a tertiary care hospital
Authors: DUMAN Ali Erkan , CETİNKAYA SARDAN Yesim 
Published: March 2022

Aim: Infective endocarditis (IE), infection of the endocardial surface of heart, may cause mortality up to 30% despite advancements in medical care. Epidemiology of IE and profile of causative organism has changed in the last years. We aimed to investigate the changing profile of IE over a 31-year period in a tertiary care hospital
Material and Method: Medical records of 290 patients treated with the diagnosis of IE between 1974 and 2005 were re-evaluated according to Modified Duke criteria. Forty seven cases were classified as rejected cases.
Results: Of the 243 patients 109 was female (44.8%) and 134 male (55.2%). The mean age of the patients was 38±16.4 years (Table). The mean age of the patients showed an increasing trend throughout the time (p< 0.001) ; it was 29 years between 1974- 1980 but increased to 54 years in 2001-2005 period. Rheumatic valvular disease (RVD) was the most frequent underlying heart disease (60%) but showed a declining trend especially in the last years. S. aureus was the most common pathogen in all the time periods (15.2%). Blood cultures were negative in 90 (43%) patients. But the percentage of blood culture negativitiy decreased significantly from 63% in 1981-1985 periods to 28% in 2001-2005 period. (p: 002). Mitral valve was the most common affected valve (52, 44%). Surgery was performed in 74 of the 243 cases (30.5%). In-hospital mortality rate was 30.6. Mortality rate was significantly lower in patients who underwent surgery compared to ones who did not (19.2% vs. 35.8%, p< 0.005). Mortality rate was also lower in patients with community acquired infection compared to ones with nosocomial infection (27% vs 45%). Embolic events, nosocomial infections and surgery were independent risk factors for mortality.
Conclusion: The mean age of IE population is increasing, RVD disesase is less commonly seen as an underlying heart and S. aureus is the most common pathogen. These findings are compatible with the reports from developed countries. Surgery displays a protective effect on the prognosis of IE
The role of serum lipoprotein levels in predicting independent short-term mortality In COVID-19 patients
Authors: AYDEMİR Semih , HOŞGÜN Derya 
Published: March 2022

Background: Plasma lipoprotein levels typically change as a result of systemic inflammation in coronavirus disease (COVID-19). These changes have been reported to be related to the severity and prognosis of the disease. The aim of this study was to evaluate the relationship between serum high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglyceride, and cholesterol levels andindependent short-term (28-day) mortality in COVID-19 patients with critical disease.
Material and Method: The retrospective study included patients that had a positive result for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on real-time reverse transcriptase polymerase chain reaction (RT-PCR) and were followed up in ICU due to pneumonia and acute hypoxemic respiratory failure between March 2020 and January 2021.
Results: The 123 patients comprised 69 (56.1%) women and 54 (43.9%) men with a mean age of 65.41±13.93 years. Mean hospital and ICU stays were 16.07±9.84 and 8.54±8.24 days, respectively. Short-term (28-day) mortality occurred in 33 (26.8%) patients. Mean serum LDL, HDL, triglyceride, and cholesterol levels were 100.61±36.32, 41.57±10.74, 136.67±85.33, and 164.4±40.73 mg/dL, respectively. Short-term (28-day) mortality established a significant relationship with LDL and HDL levels, whereas no significant relationship was established with cholesterol and triglyceride levels (p=0.001, p=0.001, p=0.332, and p=0.222, respectively). The durations of hospital and ICU stay established a significant relationship with LDL levels (p=0.033 and p=0.002, respectively).
Conclusion: Based on our results, we suggest that monitoring HDL and LDL levels with serial measurements in patients with critical and severe COVID-19 pneumonia may be useful for predicting the prognosis.
Intensity and Polarization Characteristics of Extended Neutron Star Surface Regions
Authors: Hu Kun , Baring Matthew G. , Barchas Joseph A. , Younes George 
Published: March 2022

Abstract
The surfaces of neutron stars are sources of strongly polarized soft X-rays due to the presence of strong magnetic fields. Radiative transfer mediated by electron scattering and free–free absorption is central to defining local surface anisotropy and polarization signatures. Scattering transport is strongly influenced by the complicated interplay between linear and circular polarizations. This complexity has been captured in a sophisticated magnetic Thomson scattering simulation we recently developed to model the outer layers of fully ionized atmospheres in such compact objects, heretofore focusing on case studies of localized surface regions. Yet, the interpretation of observed intensity pulse profiles and their efficacy in constraining key neutron star geometry parameters is critically dependent upon adding up emission from extended surface regions. In this paper, intensity, anisotropy, and polarization characteristics from such extended atmospheres, spanning considerable ranges of magnetic colatitudes, are determined using our transport simulation. These constitute a convolution of varied properties of Stokes parameter information at disparate surface locales with different magnetic field strengths and directions relative to the local zenith. Our analysis includes full general relativistic propagation of light from the surface to an observer at infinity. The array of pulse profiles for intensity and polarization presented highlights how powerful probes of stellar geometry are possible. Significant phase-resolved polarization degrees in the range of 10%–60% are realized when summing over a variety of surface field directions. These results provide an important background for observations to be acquired by NASA’s new Imaging X-ray Polarimetry Explorer X-ray polarimetry mission.
METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble Program. III. Interstellar Depletions, Dust-to-Metal, and Dust-to-Gas Ratios versus Metallicity
Authors: Roman-Duval Julia , Jenkins Edward B. , Tchernyshyov Kirill , Clark Christopher J. R. , De Cia Annalisa , Gordon Karl D. , Hamanowicz Aleksandra , Lebouteiller Vianney , Rafelski Marc , Sandstrom Karin , Werk Jessica , Merica-Jones Petia Yanchulova 
Published: March 2022

Abstract
The metallicity and gas density dependence of interstellar depletions, the dust-to-gas (D/G), and dust-to-metal (D/M) ratios have important implications for how accurately we can trace the chemical enrichment of the universe, either by using FIR dust emission as a tracer of the ISM or by using spectroscopy of damped Lyα systems to measure chemical abundances over a wide range of redshifts. We collect and compare large samples of depletion measurements in the Milky Way (MW), Large Magellanic Cloud (LMC) (Z = 0.5 Z
⊙), and Small Magellanic Cloud (SMC) (Z = 0.2 Z
⊙). The relations between the depletions of different elements do not strongly vary between the three galaxies, implying that abundance ratios should trace depletions accurately down to 20% solar metallicity. From the depletions, we derive D/G and D/M. The D/G increases with density, consistent with the more efficient accretion of gas-phase metals onto dust grains in the denser ISM. For log N(H) > 21 cm−2, the depletion of metallicity tracers (S, Zn) exceeds −0.5 dex, even at 20% solar metallicity. The gas fraction of metals increases from the MW to the LMC (factor 3) and SMC (factor 6), compensating for the reduction in total heavy element abundances and resulting in those three galaxies having the same neutral gas-phase metallicities. The D/G derived from depletions are respective factors of 2 (LMC) and 5 (SMC) higher than the D/G derived from FIR, 21 cm, and CO emission, likely due to the combined uncertainties on the dust FIR opacity and on the depletion of carbon and oxygen.
Anisotropic Infall and Substructure Formation in Embedded Disks
Authors: Kuznetsova Aleksandra , Bae Jaehan , Hartmann Lee , Low Mordecai-Mark Mac 
Published: March 2022

Abstract
The filamentary nature of accretion streams found around embedded sources suggests that protostellar disks experience heterogenous infall from the star-forming environment, consistent with the accretion behavior onto star-forming cores in top-down star-cluster formation simulations. This may produce disk substructures in the form of rings, gaps, and spirals that continue to be identified by high-resolution imaging surveys in both embedded Class 0/I and later Class II sources. We present a parameter study of anisotropic infall, informed by the properties of accretion flows onto protostellar cores in numerical simulations, and varying the relative specific angular momentum of incoming flows as well as their flow geometry. Our results show that anisotropic infall perturbs the disk and readily launches the Rossby wave instability. It forms vortices at the inner and outer edges of the infall zone where material is deposited. These vortices drive spiral waves and angular momentum transport, with some models able to drive stresses corresponding to a viscosity parameter on the order of α ∼ 10−2. The resulting azimuthal shear forms robust pressure bumps that act as barriers to radial drift of dust grains, as demonstrated by postprocessing calculations of drift-dominated dust evolution. We discuss how a self-consistent model of anisotropic infall can account for the formation of millimeter rings in the outer disk as well as producing compact dust disks, consistent with observations of embedded sources.
Influence of the Heliospheric Current Sheet on the Evolution of Solar Wind Turbulence
Authors: Shi 时 Chen 辰 , Velli Marco , Tenerani Anna , Réville Victor , Rappazzo Franco 
Published: March 2022

Abstract
The effects of the heliospheric current sheet (HCS) on the evolution of Alfvénic turbulence in the solar wind are studied using MHD simulations incorporating the expanding-box model. The simulations show that, near the HCS, the Alfvénicity of the turbulence decreases as manifested by lower normalized cross-helicity and larger excess of magnetic energy. The numerical results are supported by a superposed-epoch analysis using OMNI data, which shows that the normalized cross-helicity decreases inside the plasma sheet surrounding HCS, and the excess of magnetic energy is significantly enhanced at the center of HCS. Our simulation results indicate that the decrease of Alfvénicity around the HCS is due to the weakening of radial magnetic field and the effects of the transverse gradient in the background magnetic field. The magnetic energy excess in the turbulence may be a result of the loss of Alfvénic correlation between velocity and magnetic field and the faster decay of transverse kinetic energy with respect to magnetic energy in a spherically expanding solar wind.
Were the Obliquities in DI Herculis Excited by an Unseen Tertiary Companion?
Authors: Anderson Kassandra R. , Winn Joshua N. 
Published: March 2022

Abstract
The eclipsing binary DI Herculis has garnered interest for several decades because of an apparent disagreement between the observed and calculated values of the apsidal precession rate. The problem was resolved when both stars were found to have high obliquities, but the reason for the high obliquities is unknown. Here, we investigate the possibility that the obliquities are (or were) excited by an unseen tertiary star. Obliquity excitation in the current orbital configuration can be ruled out with existing data; any tertiary star that is sufficiently close or massive to overcome the strong spin–orbit coupling of the binary would have been detected through various dynamical effects. It remains possible that the orbit of DI Herculis was initially wider and the obliquity was excited during high-eccentricity tidal migration driven by a tertiary companion, but in this scenario it would be difficult to explain why the observed spin rates are much faster than the pseudo-synchronous rate. In addition, inward migration is most likely to arise when the mass of the perturbing star is comparable to the binary mass, and such a bright tertiary would have been detected in imaging or spectroscopic data. Alternative explanations that do not invoke a tertiary star should be sought for the large obliquities in DI Herculis.
Investigation of the Long-term Variation of Solar Ca ii K Intensity. II. Reconstruction of Solar UV Irradiance
Authors: Kakuwa Jun , Ueno Satoru 
Published: March 2022

Abstract
Reconstruction of long-term solar UV variations during the entire 20th century is reported. The sunspot number has been used for this purpose so far. By using the full-disk Ca K intensity as an additional solar UV proxy, the range of allowed values for the reconstructed UV irradiance becomes more restricted. We use long-term archival data of the photographic Ca K plates digitized at the Kodaikanal Solar Observatory. The photographic calibration method developed in our previous paper (Paper I) is applied. Various long-term proxy data of solar activity have been used to estimate past UV irradiance. In light of this context, some issues using the historical Ca K data are commented on.
Traité du management socio-économique
Authors: Lindsay R. Murray , Savall Henri 
Published: March 2022

Le contrôle de gestion dans le monde anglo-saxon a largement suivi une philosophie cybernétique depuis le début du XX e siècle, le cadre conceptuel de Robert Anthony (1965) ayant eu une profonde influence. La domination de cette philosophie a rendu difficile une conception alternative du contrôle, empêchant un public plus large d’apprécier ce qu’offre le management socio-économique. Cependant, les commentaires d’Anthony (1988) concernant les lacunes de son cadre, qui ont été largement négligées, apportent une clarté exceptionnelle en signalant les questions clés qui sous-tendent ce que Hofstede (1978) appelle « la pauvreté de la philosophie du contrôle de gestion ». Ils permettent également de considérer le management socio-économique sous un jour nouveau et convaincant.
Traité du management socio-économique
Authors: Quesada Sánchez Francisco Javier , Jiménez Montañés Ángela 
Published: March 2022

Les organisations sont liées et soumises à un ensemble de changements et de menaces qui conditionnent leur comportement socio-économique. Cet ensemble de menaces se traduit par des risques commerciaux, qui doivent être identifiés et valorisés, afin d’atténuer les effets négatifs qu’elles peuvent avoir sur la performance économique et sociale des organisations. Ce chapitre expose et analyse l’importance de l’étude des risques à l’heure actuelle et leur gestion, dans la perspective du modèle COSO et de l’ISO 31000, compte tenu des différentes classifications de risque qui doivent être identifiées. Enfin, nous concluons par une brève présentation des risques à identifier dans l’activité de vérification des comptes, en appliquant le modèle de risque identifié dans la Norme internationale d’audit NIA-ES 315.
Traité du management socio-économique
Authors: Peñalva Rosales Laura P. , Pomar Fernández Silvia 
Published: March 2022

La recherche est abordée dans une perspective descriptive et explicative du rôle des organisations intermédiaires en tant que générateurs de confiance et de gouvernance, facilitateurs de communication et lecteurs de la réalité ; d’où leur pertinence pour la formation de réseaux organisationnels. Pour cela, une analyse documentaire est réalisée. L’importance de ces organisations est illustrée par la présentation du cas de l’Institut National des Entrepreneurs (INADEM), une organisation créée par le gouvernement fédéral mexicain qui soutient l’entrepreneuriat et les micro, petites et moyennes entreprises qui ont un potentiel de croissance.
Traité du management socio-économique
Authors: Garcia Manuel , Beck Emmanuel 
Published: March 2022

La lecture de Platon et d’Aristote montre encore de nos jours des convergences épistémologiques qui nous interrogent. Platon développe une démarche analytique et des raisonnements rigoureux, alors qu’Aristote s’investit dans l’approche globale et systémique d’un objet en évolution grâce à son potentiel : « l’étant ». La théorie socio-économique applique aux organisations une approche similaire. Des améliorations épistémologiques sensibles ont été apportées, d’une part pour clarifier le processus abductif de l’analyse de l’organisation en évolution, et, d’autre part, pour expliciter les relations entre les facteurs de contingence et les invariants dans une forme de constructivisme générique.
Traité du management socio-économique
Authors: Bonnet Daniel , Beck Emmanuel 
Published: March 2022

Ce chapitre met en perspective la dimension clinique de la Recherche Intervention Socio-Économique (RISE). La dimension clinique de la RISE permet une recherche approfondie des causes-racines des dysfonctionnements à l’origine des Coûts-Performances Cachés. La RISE conduit les acteurs à réaliser un travail intellectuel et psychologique pour mettre en œuvre collectivement les actions du changement à envisager pour « réparer » les dysfonctionnements et convertir les coûts cachés en valeur ajoutée pour l’entreprise. Dans certains contextes, il s’agit de traiter des problématiques lourdes. Le travail des acteurs est orienté par un dispositif de recherche accompagnant la transformation des structures mentales.
La place des spectres (1871/1968). Des appels du passé pour nourrir l’avenir
Authors: Bantigny Ludivine 
Published: March 2022

Durant la Commune de Paris, on s’est beaucoup référé au passé, en particulier à la Révolution française et aux révolutions de 1830 et 1848. En mai-juin 1968, c’est la Commune à son tour qui a été très présente et très citée. Cet article propose de montrer comment cette manière de se situer dans le temps et ce sentiment puissant de faire l’histoire en prenant appui sur des événements du passé participent pleinement d’un protagonisme actif et conscient, qui conforte les engagements et leur donne de l’élan. Grâce à ces deux exemples entremêlés, 1871 et 1968, l’article analyse une « temporalité utopique » où l’aspiration à l’émancipation devient une ligne forte du temps, une sorte d’esprit d’époque, un trait temporel dominant. Les morts du passé sont alors des spectres, qui en quelque sorte réclament une mémoire mais aussi des combats prolongés.
Entre temps de l’inéluctable et temps du possible : les grèves de l’automobile (1981-1984)
Authors: Gay Vincent 
Published: March 2022

Les grèves des ouvriers immigrés de l’automobile du début des années 1980 sont traversées par un sentiment de crise, plus ou moins fort selon les parties prenantes concernées. Pour les protagonistes industriels et étatiques, la nécessité de restructurer condamne une partie des ouvriers immigrés à devoir quitter les usines. Or, en participant aux conflits sociaux, les ouvriers immigrés de Citroën et Talbot agissent à contretemps de ce sentiment de crise. Les consciences différenciées de la crise traduisent des rapports variés au temps : le temps de crise est celui de l’inéluctable et du déterminisme industriel, auquel fait face le temps du conflit qui agit comme un temps du possible.
Les temps de l’imaginaire révolutionnaire. Temporalités de l’agir politique dans la révolution tunisienne
Authors: Abbas Nabila 
Published: March 2022

Dans cet article, je défends l’hypothèse que les imaginaires politiques des acteurs et actrices de la Révolution tunisienne (2011) nous permettent de comprendre leur relation à la temporalité du moment révolutionnaire. Par « imaginaires », on entend les significations et représentations partagées que les acteurs et actrices développent au cours de leurs actions et expériences politiques, et qui ne s’expriment pas uniquement ou même principalement en termes idéologiques. À partir d’une longue étude de terrain, l’article montre que c’est l’expérience révolutionnaire elle-même qui a libéré l’imaginaire des actrices et acteurs, les affranchissant de la représentation qui prédominait sous la dictature d’un présent sans futur.