bluuebunny/crossref_metadata_2025 huggingface dataset:
Analytic Light Curve for Mutual Transits of Two Bodies Across a Limb-darkened Star
Authors: Gordon Tyler A. , Agol Eric
Published: August 2022

We present a solution for the light curve of two bodies mutually transiting a star with polynomial limb darkening. The term “mutual transit” in this work refers to a transit of the star during which overlap occurs between the two transiting bodies. These could be an exoplanet with an exomoon companion, two exoplanets, an eclipsing binary and a planet, or two stars eclipsing a third in a triple-star system. We include analytic derivatives of the light curve with respect to the positions and radii of both bodies. We provide code that implements a photodynamical model for a mutual transit. We include two dynamical models, one for hierarchical systems in which a secondary body orbits a larger primary (e.g., an exomoon system) and a second for confocal systems in which two bodies independently orbit a central mass (e.g., two planets in widely separated orbits). Our code is fast enough to enable inference with Markov Chain Monte Carlo algorithms, and the inclusion of derivatives allows for the use of gradient-based inference methods such as Hamiltonian Monte Carlo. While applicable to a variety of systems, this work was undertaken primarily with exomoons in mind. It is our hope that making this code publicly available will reduce barriers for the community to assess the detectability of exomoons, conduct searches for exomoons, and attempt to validate existing exomoon candidates. We also anticipate that our code will be useful for studies of planet–planet transits in exoplanetary systems, transits of circumbinary planets, and eclipses in triple-star systems.
Mass–Velocity Dispersion Relation by Using the Gaia Data and Its Effect on Interpreting Short-duration and Degenerate Microlensing Events
Authors: Sajadian Sedighe , Rahvar Sohrab , Kazemian Fatemeh
Published: August 2022

Gravitational microlensing, the lensing of stars in the Milky Way with other stars, has been used for exploring compact dark matter objects, exoplanets, and black holes. The duration of microlensing events, the so-called Einstein crossing time, is a function of distance, mass, and velocities of lens objects. Lenses with different ages and masses might have various characteristic velocities inside the Galaxy and this might lead to our misinterpretation of microlensing events. In this work, we use the Gaia archived data to find a relation between the velocity dispersion and mass, and the age of stars. This mass–velocity dispersion relation confirms the known age–velocity relation for early-type and massive stars, and additionally reveals a dependence of stellar velocity dispersion on the mass for low-mass and late-type stars at a 2σ–3σ level. By considering this correlation, we simulate short-duration microlensing events due to brown dwarfs. From this simulation, we conclude that lens masses are underestimated by ∼2.5%–5.5% while modeling short-duration and degenerate microlensing events with the Bayesian analysis.
Star Cluster Formation and Evolution in M101: An Investigation with the Legacy Extragalactic UV Survey
Authors: Linden S. T. , Perez G. , Calzetti D. , Maji S. , Messa M. , Whitmore B. C. , Chandar R. , Adamo A. , Grasha K. , Cook D. O. , Elmegreen B. G. , Dale D. A. , Sacchi E. , Sabbi E. , Grebel E. K. , Smith L.
Published: August 2022

We present Hubble Space Telescope WFC3/UVIS (F275W, F336W) and ACS/WFC optical (F435W, F555W, and F814W) observations of the nearby grand-design spiral galaxy M101 as part of the Legacy Extragalactic UV Survey (LEGUS). Compact sources detected in at least four bands were classified by both human experts and the convolutional neural network StarcNet. Human experts classified the 2351 brightest sources, retrieving N

c
= 965 star clusters. StarcNet, trained on LEGUS data not including M101, classified all 4725 sources detected in four bands, retrieving N

c
= 2270 star clusters. The combined catalog represents the most complete census to date of compact star clusters in M101. We find that for the 2351 sources with both a visual- and machine-learning classification StarcNet is able to reproduce the human classifications at high levels of accuracy (∼80%–90%), which is equivalent to the level of agreement between human classifiers in LEGUS. The derived cluster age distribution implies a disruption rate of

dN

/

d
τ
∝

τ

−
0.45
±
0.14

over 107 < τ < 108.5 yr for cluster masses ≥103.55
M
⊙ for the central region of M101 and

dN

/

d
τ
∝

τ

−
0.02
±
0.15

for cluster masses ≥103.38
M
⊙ in the northwest region of the galaxy. The trends we recover are weaker than those of other nearby spirals (e.g., M51) and starbursts, consistent with the M101 environment having a lower-density interstellar medium, and providing evidence in favor of environmentally dependent cluster disruption in the central, southeast, and northwest regions of M101.
Supercritical Growth Pathway to Overmassive Black Holes at Cosmic Dawn: Coevolution with Massive Quasar Hosts
Authors: Hu Haojie , Inayoshi Kohei , Haiman Zoltán , Li Wenxiu , Quataert Eliot , Kuiper Rolf
Published: August 2022

Observations of the most luminous quasars at high redshifts (z > 6) have revealed that the largest supermassive black holes (SMBHs) at those epochs tend to be substantially overmassive relative to their host galaxies compared to the local relations, suggesting they experienced rapid early growth phases. We propose an assembly model for the SMBHs that end up in rare massive ∼1012
M
⊙ host halos at z ∼ 6–7, applying a kinetic feedback prescription for BHs accreting above the Eddington rate, provided by radiation hydrodynamic simulations for the long-term evolution of the accretion-flow structure. The large inflow rates into these halos during their assembly enable the formation of >109
M
⊙ SMBHs by z ∼ 6, even starting from stellar-mass seeds at z ∼ 30, and even in the presence of outflows that reduce the BH feeding rate, especially at early times. This mechanism also naturally yields a high BH-to-galaxy mass ratio of >0.01 before the SMBH mass reaches M
BH > 109
M
⊙ by z ∼ 6. These fast-growing SMBH progenitors are bright enough to be detected by upcoming observations with the James Webb Space Telescope over a wide range of redshift (7 < z < 15), regardless of how they were seeded.
Observing Scenarios for the Next Decade of Early Warning Detection of Binary Neutron Stars
Authors: Magee Ryan , Borhanian Ssohrab
Published: August 2022

We describe representative observing scenarios for early warning detection of binary neutron star mergers with the current generation of ground-based gravitational wave detectors as they approach design sensitivity. We incorporate recent estimates of the infrastructure latency and detector sensitivities to provide up-to-date predictions. We use Fisher analysis to approximate the associated localizations, and we directly compare to Bayestar to quantify biases inherited from this approach. In particular, we show that Advanced LIGO and Advanced Virgo will detect and distribute ≲1 signal with signal-to-noise ratio greater than 15 before a merger in their fourth observing run provided they maintain a 70% duty cycle. This is consistent with previous early warning detection estimates. We estimate that 60% of all observations and 8% of those detectable 20 s before a merger will be localized to ≲100 deg2. If KAGRA is able to achieve a 25 Mpc horizon, 70% of these binary neutron stars will be localized to ≲100 deg2 by a merger. As the Aundha–Hanford–KAGRA–Livingston–Virgo network approaches design sensitivity over the next ∼10 yr, we expect one (six) early warning alerts to be distributed 60 (0) s before a merger. Although adding detectors to the Hanford–Livingston–Virgo network at design sensitivity impacts the detection rate at ≲50% level, it significantly improves localization prospects. Given uncertainties in sensitivities, participating detectors, and duty cycles, we consider 103 future detector configurations so electromagnetic observers can tailor preparations toward their preferred models.
Ice Features of Low-luminosity Protostars in Near-infrared Spectra of AKARI/IRC
Authors: Kim Jaeyeong , Lee Jeong-Eun , Jeong Woong-Seob , Kim Il-Seok , Aikawa Yuri , Noble Jeniffer A. , Choi Minho , Lee Ho-Gyu , Dunham Michael M. , Kim Chul-Hwan , Koo Bon-Chul
Published: August 2022

We present near-infrared spectra of three low-luminosity protostars and one background star in the Perseus molecular cloud, acquired using the infrared camera on board the AKARI space telescope. For the comparison with different star-forming environments, we also present spectra of the massive protostar AFGL 7009S, where the protostellar envelope is heated significantly, and the low-mass protostar RNO 91, which is suspected to be undergoing an episodic burst. We detected ice absorption features of H2O, CO2, and CO in all spectra around the wavelengths of 3.05, 4.27, and 4.67 μm, respectively. For at least two low-luminosity protostars, we also detected the XCN ice feature at 4.62 μm. The presence of the crystalline H2O ice and XCN ice components indicates that the low-luminosity protostars experienced a hot phase via accretion bursts during the past mass accretion process. We compared the ice abundances of the low-luminosity protostars with those of embedded low-mass protostars and the dense molecular clouds and cores, suggesting that their ice abundances reflect the strength of prior bursts and the timescale after the last burst.
Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
Authors: Okoda Yuki , Oya Yoko , Imai Muneaki , Sakai Nami , Watanabe Yoshimasa , López-Sepulcre Ana , Saigo Kazuya , Yamamoto Satoshi
Published: August 2022

Resolving physical and chemical structures in the vicinity of a protostar is of fundamental importance for elucidating their evolution to a planetary system. In this context, we have conducted 1.2 mm observations toward the low-mass protostellar source B335 at a resolution of 0.″03 with the Atacama Large Millimeter/submillimeter Array. More than 20 molecular species including HCOOH, NH2CHO, HNCO, CH3OH, CH2DOH, CHD2OH, and CH3OD are detected within a few tens au around the continuum peak. We find a systematic chemical differentiation between oxygen-bearing and nitrogen-bearing organic molecules by using the principal component analysis for the image cube data. The distributions of the nitrogen-bearing molecules are more compact than those of the oxygen-bearing ones except for HCOOH. The temperature distribution of the disk/envelope system is revealed by a multiline analysis for each of HCOOH, NH2CHO, CH3OH, and CH2DOH. The rotation temperatures of CH3OH and CH2DOH at the radius of 0.″06 along the envelope direction are derived to be 150–165 K. On the other hand, those of HCOOH and NH2CHO, which have a smaller distribution, are 75–112 K, and are significantly lower than those for CH3OH and CH2DOH. This means that the outer envelope traced by CH3OH and CH2DOH is heated by additional mechanisms rather than protostellar heating. We here propose the accretion shock as the heating mechanism. The chemical differentiation and the temperature structure on a scale of a few au provide us with key information to further understand chemical processes in protostellar sources.
Density and Refractive Index of Carbon Monoxide Ice at Different Temperatures
Authors: Luna Ramón , Millán Carlos , Domingo Manuel , Santonja Carmina , Satorre Miguel Á.
Published: August 2022

This paper is intended to study the density and the refractive index of the solid carbon monoxide in the interval 13–28 K to improve our understanding of the dynamics in the astrophysical environments where they are present. A series of deposition experiments have been performed under high vacuum conditions to study the properties of this ice under astrophysical conditions. Ice density has been experimentally calculated at different deposition temperatures of astrophysical interest, which complement the scarce values present in the literature. The refractive index has also been experimentally determined. The data have been used to obtain an experimental relationship between refractive index and density. Values of density are necessary to interpret observations of astrophysical objects or to design irradiation experiments to understand how irradiation affects ices present in these objects. The experimental relationship found between density and refractive index allows us to estimate density from a known refractive index, even for temperatures not reached using our experimental setup.
Thermal and Non-thermal Properties of Active Region Recurrent Coronal Jets
Authors: Paraschiv Alin R. , Donea Alina C. , Judge Philip G.
Published: August 2022

We present observations of recurrent active region coronal jets, and derive their thermal and non-thermal properties, by studying the physical properties of the plasma simultaneously at the base footpoint and along the outflow of jets. The sample of analyzed solar jets were observed by SDO-AIA in extreme ultraviolet and by RHESSI in the X-ray domain. The main thermal plasma physical parameters, such as temperature, density, energy flux contributions, etc., are calculated using multiple inversion techniques to obtain the differential emission measure from extreme-ultraviolet filtergrams. The underlying models are assessed, and their limitations and applicability are scrutinized. Complementarily, we perform source reconstruction and spectral analysis of higher energy X-ray observations to further assess the thermal structure and identify non-thermal plasma emission properties. We discuss a peculiar penumbral magnetic reconnection site, which we previously identified as a “Coronal Geyser.” Evidence supporting cool and hot thermal emission, as well as non-thermal emission, is presented for a subset of geyser jets. These active region jets are found to be energetically stronger than their polar counterparts, but we find their potential influence on heliospheric energetics and dynamics to be limited. We scrutinize whether the geyser does fit the non-thermal erupting microflare picture, finding that our observations at peak flaring times can only be explained by a combination of thermal and non-thermal emission models. This analysis of geysers provides new information and observational constraints applicable to theoretical modeling of solar jets.
The Solar Minimum Eclipse of 2019 July 2. II. The First Absolute Brightness Measurements and MHD Model Predictions of Fe x, xi, and xiv out to 3.4 R
⊙
Authors: Boe Benjamin , Habbal Shadia , Downs Cooper , Druckmüller Miloslav
Published: August 2022

We present the spatially resolved absolute brightness of the Fe x, Fe xi, and Fe xiv visible coronal emission lines from 1.08 to 3.4 R
⊙, observed during the 2019 July 2 total solar eclipse (TSE). The morphology of the corona was typical of solar minimum, with a dipole field dominance showcased by large polar coronal holes and a broad equatorial streamer belt. The Fe xi line is found to be the brightest, followed by Fe x and Fe xiv (in disk B
⊙ units). All lines had brightness variations between streamers and coronal holes, where Fe xiv exhibited the largest variation. However, Fe x remained surprisingly uniform with latitude. The Fe line brightnesses are used to infer the relative ionic abundances and line-of-sight-averaged electron temperature (T

e
) throughout the corona, yielding values from 1.25 to 1.4 MK in coronal holes and up to 1.65 MK in the core of streamers. The line brightnesses and inferred T

e
values are then quantitatively compared to the Predictive Science Inc. magnetohydrodynamic model prediction for this TSE. The MHD model predicted the Fe lines rather well in general, while the forward-modeled line ratios slightly underestimated the observationally inferred T

e
within 5%–10% averaged over the entire corona. Larger discrepancies in the polar coronal holes may point to insufficient heating and/or other limitations in the approach. These comparisons highlight the importance of TSE observations for constraining models of the corona and solar wind formation.
Infall Profiles for Supercluster-scale Filaments
Authors: Odekon Mary Crone , Jones Michael G. , Graham Lucas , Kelley-Derzon Jessica , Halstead Evan
Published: August 2022

We present theoretical expectations for infall toward supercluster-scale cosmological filaments, motivated by the Arecibo Pisces–Perseus Supercluster Survey (APPSS) to map the velocity field around the Pisces–Perseus Supercluster (PPS) filament. We use a minimum spanning tree applied to dark matter halos the size of galaxy clusters to identify 236 large filaments within the Millennium simulation. Stacking the filaments along their principal axes, we determine a well-defined, sharp-peaked velocity profile function that can be expressed in terms of the maximum infall rate V
max and the distance ρ
max between the location of maximum infall and the principal axis of the filament. This simple, two-parameter functional form is surprisingly universal across a wide range of linear mass densities. V
max is positively correlated with the halo mass per length along the filament, and ρ
max is negatively correlated with the degree to which the halos are concentrated along the principal axis. We also assess an alternative, single-parameter method using V
25, the infall rate at a distance of 25 Mpc from the axis of the filament. Filaments similar to the PPS have

V

max

=
612

±

116 km s−1,

ρ

max

=
8.9
±
2.1

Mpc, and V
25 = 329 ± 68 km s−1. We create mock observations to model uncertainties associated with viewing angle, lack of three-dimensional velocity information, limited sample size, and distance uncertainties. Our results suggest that it would be especially useful to measure infall for a larger sample of filaments to test our predictions for the shape of the infall profile and the relationships among infall rates and filament properties.
CARAMEL-gas: A Step toward Fast Empirical Models of the Broad-line-emitting Gas
Authors: Williams Peter R. , Treu Tommaso
Published: August 2022

Fast empirical models of the broad emission line region (BLR) are a powerful tool to interpret velocity-resolved reverberation mapping (RM) data, estimate the mass of the supermassive black holes, and gain insight into its geometry and kinematics. Much of the effort so far has been devoted to describing the emissivity of one emission line at a time. We present here an alternative approach aimed at describing the underlying BLR gas distribution, by exploiting simple numerical recipes to connect it with emissivity. This approach is a step toward describing multiple emission lines originating from the same gas and allows us to clarify some issues related to the interpretation of RM data. We illustrate this approach—implemented in the code CARAMEL-gas—using three data sets covering the Hβ emission line (Mrk 50, Mrk 1511, Arp 151) that have been modeled using the emissivity-based version of the code. As expected, we find differences in the parameters describing the BLR gas and emissivity distribution, but the emissivity-weighted lag measurements and all other model parameters including black hole mass and overall BLR morphology and kinematics are consistent with the previous measurements. We also model the Hα emission line for Arp 151 using both the gas- and emissivity-based BLR models. We find ionization stratification in the BLR with Hα arising at larger radii than Hβ, while all other model parameters are consistent within the uncertainties.
Infrared Excess of a Large OB Star Sample
Authors: Deng 邓 Dingshan 丁山 , Sun 孙 Yang 漾 , Wang 王 Tianding 天丁 , Wang 王 Yuxi 钰溪 , Jiang 姜 Biwei 碧沩
Published: August 2022

The infrared (IR) excess from OB stars is commonly considered to be a contribution from ionized stellar wind or circumstellar dust. With the newly published Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST)-OB catalog and Galactic O-Star Spectroscopic Survey data, this work steps further on understanding the IR excess of OB stars. Based on a forward-modeling approach comparing the spectral slope of observational spectral energy distributions and photospheric models, 1147 stars are found to have IR excess out of 7818 stars with good-quality photometric data. After removing the objects in the sightline of dark clouds, 532 (∼7%) B-type stars and 118 (∼23%) O-type stars are identified to be true OB stars with circumstellar IR excess emission. The ionized stellar wind model and the circumstellar dust model are adopted to explain the IR excess, and Bayes factors are computed to quantitatively compare the two. It is shown that the IR excess can be accounted for by the stellar wind for about 65% cases, of which 33% by free–free emission and 32% by synchrotron radiation. Other 30% sources could have and 4% should have a dust component or other mechanisms to explain the sharp increase in flux at λ > 10 μm. The parameters of the dust model indicate a large-scale circumstellar halo structure, which implies the origin of the dust from the birthplace of the OB stars. A statistical study suggests that the proportion with IR excess in OB stars increases with the stellar effective temperature and luminosity, and that there is no systematic change in the mechanism for IR emission with stellar parameters.
The ALPINE–ALMA [C ii] Survey: The Infrared–Radio Correlation and Active Galactic Nucleus Fraction of Star-forming Galaxies at z ∼ 4.4–5.9
Authors: Shen Lu , Lemaux Brian C. , Lubin Lori M. , Liu Guilin , Béthermin Matthieu , Boquien Médéric , Cucciati Olga , Le Fèvre Olivier , Talia Margherita , Vergani Daniela , Zamorani Gianni , Faisst Andreas L. , Ginolfi Michele , Gruppioni Carlotta , Jones Gareth C. , Bardelli Sandro , Hathi Nimish , Koekemoer Anton M. , Romano Michael , Schaerer Daniel , Zucca Elena , Fang Wenjuan , Forrest Ben , Gal Roy , Hung Denise , Shah Ekta A. , Staab Priti , Vanderhoof Brittany , Ibar Eduardo
Published: August 2022

We present the radio properties of 66 spectroscopically confirmed normal star-forming galaxies (SFGs) at 4.4 < z < 5.9 in the COSMOS field that were [C ii]-detected in the Atacama Large Millimeter/submillimeter Array Large Program to INvestigate [C ii] at Early times (ALPINE). We separate these galaxies (“C ii-detected-all”) into lower-redshift (“C ii-detected-lz”; 〈z〉 = 4.5) and higher-redshift (“C ii-detected-hz”; 〈z〉 = 5.6) subsamples, and stack multiwavelength imaging for each subsample from X-ray to radio bands. A radio signal is detected in the stacked 3 GHz images of the C ii-detected-all and lz samples at ≳3σ. We find that the infrared–radio correlation of our sample, quantified by q
TIR, is lower than the local relation for normal SFGs at a ∼3σ significance level, and is instead broadly consistent with that of bright submillimeter galaxies at 2 < z < 5. Neither of these samples show evidence of dominant active galactic nucleus activity in their stacked spectral energy distributions (SEDs), UV spectra, or stacked X-ray images. Although we cannot rule out the possible effects of the assumed spectral index and applied infrared SED templates in causing these differences, at least partially, the lower obscured fraction of star formation than at lower redshift can alleviate the tension between our stacked q
TIRs and those of local normal SFGs. It is possible that the dust buildup, which primarily governs the infrared emission, in addition to older stellar populations, has not had enough time to occur fully in these galaxies, whereas the radio emission can respond on a more rapid timescale. Therefore, we might expect a lower q
TIR to be a general property of high-redshift SFGs.
Resolving the Core of R136 in the Optical
Authors: Kalari Venu M. , Horch Elliott P. , Salinas Ricardo , Vink Jorick S. , Andersen Morten , Bestenlehner Joachim M. , Rubio Monica
Published: August 2022

The sharpest optical images of the R136 cluster in the Large Magellanic Cloud are presented, allowing us for the first time to resolve members of the central core, including R136a1, the most-massive star known. These data were taken using the Gemini speckle imager Zorro in medium-band filters with effective wavelengths similar to BVRI achieving angular resolutions between 30–40 mas. All stars previously known in the literature, having V < 16 mag within the central 2″ × 2″, were recovered. Visual companions (≥40 mas; 2000 au) were detected for the WN5h stars R136 a1 and a3. Photometry of the visual companion of a1 suggests it is of mid-O spectral type. Based on new photometric luminosities using the resolved Zorro imaging, the masses of the individual WN5h stars are estimated to be between 150 and 200 M
⊙, lowering significantly the present-day masses of some of the most-massive stars known. These mass estimates are critical anchor points for establishing the stellar upper-mass function.
Phenytoin concentration in people with epilepsy: a comparative study in serum and saliva
Authors: Alvarado Angel , García Gregoriana , Morales Alexis , Paredes Gustavo , Mora Miriam , Muñoz Ana María , Pariona Ricardo , Bendezú María R. , Chávez Haydee , García Jorge A. , Laos-Anchante Doris , Loja-Herrera Berta , Bolarte-Arteaga Mario , Pineda Mario
Published: August 2022

In clinical practice, therapeutic drug monitoring (TDM) makes it possible to measure the concentration of drugs in serum or saliva, the purpose of which is to reduce adverse effects and optimize pharmacological therapy. The objective was to determine the concentrations of Phenytoin in saliva and serum of people with epilepsy. Cross-sectional, descriptive study with dynamic recruitment of 30 people with epilepsy (n = 30; 17 men, 56.7% and 13 women, 43.3%; mean age 33.9 ± 11.83 years). Serum and saliva samples were collected at trough levels from patients, who were under phenytoin treatment for at least three months. Drug levels were assessed by the Cloned Donor Enzyme Immunoassay method. Phenytoin levels were found in saliva between 0.01 to 3.56 mg/L and in serum between 0.09 to 36.60 mg/L. Pearson’s analysis showed an association between the estimated serum and saliva phenytoin concentrations (R20.7026; 95% CI 0.685-0.921), with a significant statistical correlation (p < 0.05). The Bland-Altman test broke concordance, the difference between the two saliva/serum methods is within 95% confidence. It is concluded that there is an association and concordance between the concentrations of phenytoin in serum and saliva, therefore, this technique can be useful in the clinical monitoring of phenytoin.
Les liens entre la rémunération intangible, les attentes au travail et l’intention de quitter : une étude quasi expérimentale
Authors: Côté Frédéric-Martin , Renaud Stéphane
Published: August 2022

Cette recherche a deux objectifs principaux. Le premier est d’examiner l’impact de la rémunération intangible sur l’intention de quitter. Le second est d’étudier le rôle modérateur des attentes au travail sur la relation entre la rémunération intangible et l’intention de quitter. En s’appuyant sur un recensement des écrits ainsi que sur la théorie du signal et la théorie de l’échange social, il est postulé que la rémunération intangible diminue l’intention de quitter et que les attentes au travail modèrent cette relation. Les données utilisées proviennent d’une étude, quasi expérimentale à deux facteurs, menée auprès de 318 étudiants au premier cycle d’une école de gestion d’une grande université canadienne. La rémunération intangible est mesurée par deux facteurs, à savoir 1- la reconnaissance, et 2- la formation et le développement. Les résultats indiquent que la rémunération intangible a un impact significatif sur l’intention de quitter. Spécifiquement, la reconnaissance et la formation et le développement diminuent l’intention de quitter. Pour leur part, les attentes au travail sont mesurées par deux facteurs, à savoir 1- l’accomplissement au travail, et 2- conciliation vie personnelle et vie professionnelle. Les résultats indiquent que seules les attentes en matière d’accomplissement au travail modèrent la relation négative entre la formation et le développement et l’intention de quitter. Cette étude se termine en discutant les résultats, ses préconisations managériales et propose des pistes de recherches futures.
Analyse de l’impact d’une transformation agile sur la reconnaissance au travail
Authors: Abeli Mukamba Alexis , Dupont Claire
Published: August 2022

L’utilisation de stratégies agiles pour donner aux entreprises plus de flexibilité et de capacité d’anticiper le changement dans leur environnement peut passer par des structures informelles, plates, horizontales avec un leadership axé sur les objectifs et un contrôle décentralisé. Dans des telles structures, il n’est pas rare que des personnes de niveaux de compétences différents et de profils divers soient intégrées dans de petites équipes multidisciplinaires. L’objectif de notre article est d’étudier si la décision de soustraire les salariés de leurs pairs en les intégrant dans de telles équipes multidisciplinaires ne remet pas en question la reconnaissance équitable au travail. Nous avons mené chez TelcoPlus (nom fictif), entreprise de télécommunication débutant le déploiement de sa stratégie agile, une étude qualitative basée sur la participation observante suivie de 32 entretiens. Nos résultats montrent que, dans ce contexte, les salariés éprouvent des sentiments différents en termes de reconnaissance et d’inéquité.
Les nouveaux dispositifs d’apprentissage accru en milieu de travail : apports et défis de l’usage du numérique
Authors: Chochard Yves , Dubeau Annie , Ryabets Tetyana , Jutras-Dupont Camille , Wirth Christian
Published: August 2022

Afin de pallier les pénuries de main-d'œuvre, les pouvoirs publics développent des dispositifs de formation innovants basés sur une alternance travail-études accrue qui intègrent des outils numériques (en particulier, pour de l’enseignement à distance). Cet article analyse l’impact du numérique sur les pratiques des entreprises, des travailleurs étudiants et des enseignants qui utilisent ces dispositifs. Le cadre conceptuel de la « situation d’enseignement-apprentissage » (Hérold, 2019) a permis d’analyser de manière dynamique et systémique trois différents dispositifs d’apprentissage accru en milieu de travail. Les résultats démontrent que les transformations que connaissent ces dispositifs sont liées aux caractéristiques des travailleurs, aux dimensions techniques des dispositifs et, surtout, à la dynamique qui se crée entre les différents acteurs dans et en dehors de l’entreprise. Dans la discussion de cet article, des préconisations managériales explicites sont formulées pour enrichir le fonctionnement de ces dispositifs et favoriser la persévérance et la réussite des travailleurs formés.
Mélancolies françaises. Mémoire, oubli et réparation dans Supplément à la vie de Barbara Loden et La Robe blanche de Nathalie Léger
Authors: Dion Robert
Published: August 2022

Dans ces deux récits, publiés respectivement en 2012 et en 2018, Nathalie Léger évoque les trajectoires fuyantes de deux artistes ayant réellement vécu, l’actrice-cinéaste américaine Barbara Loden et l’artiste-performeuse italienne Pippa Bacca, toutes deux trop tôt disparues dans des circonstances tragiques (un cancer foudroyant pour l’une, un assassinat pour l’autre). À travers l’analyse de ces ouvrages consacrés à des figures « secondaires » du cinéma et de l’art contemporain, il s’agira de voir comment se fait jour une écriture mélancolique qui est une façon de réhabiliter mais aussi de prendre la mesure de l'oubli, de la disparition de ces figures dans l’indifférence générale de la grande marche du monde.
Le ciel, une célébration de l’homme et de la femme. Le parachute d’André Jacques Garnerin (1797)
Authors: Millet Céline
Published: August 2022

L’objectif de notre article est de nous pencher sur le retentissement social et sur l’impact dans l’imaginaire collectif de l’usage du parachute, en centrant notre étude sur la descente réalisée le 22 octobre 1797 par André Jacques Garnerin depuis un ballon à air inflammable, à Paris, au parc des Mousseaux, ainsi que sur celle de Jeanne Geneviève Labrosse effectuée le 12 octobre 1799 à Tivoli. Parce qu’au mouvement ascendant des ballons s’ajoute désormais une « maîtrise de la descente », le parachute contribue au développement du ciel comme lieu de célébration des pouvoirs de l’être humain et espace de liberté d’expression pour le sexe féminin. Nous nous appuierons, pour aborder cette question, sur plusieurs articles de presse tels ceux du Journal de Paris , ainsi que sur Le Parachute (1797) et La Femme au parachute ou le soupçon (1799), deux vaudevilles se faisant l’écho de l’actualité.
Une joyeuse dérive : passages de ballons dans le ciel du théâtre
Authors: Causse Pierre
Published: August 2022

L’article s’intéresse à la présence scénique des ballons aérostatiques au cours du long xix e  siècle, dans ses dimensions spectaculaires, dramaturgiques et culturelles. Dès l’invention des frères Montgolfier en 1783, le ballon entre en scène et traverse tous les genres, du vaudeville à la féerie, en passant par la revue et le mélodrame. Grâce au ballon, le théâtre divertit en mettant à distance les prétentions à la maîtrise humaine des éléments, en multipliant les jeux avec l’espace scénique et ses limites, en déployant des décors fascinants et en les mettant en mouvement grâce aux innovations techniques, offrant au public un voyage dans un fauteuil. Cette étude d’une vingtaine de pièces contribue à l’histoire culturelle de la conquête de l’air et montre comment dramaturges et metteurs en scène font du ciel un espace de jeu.
« Ce gentlemen [ sic ] rider du turf atmosphérique » : l’aérostation, la masculinité aristocratique et l’imaginaire colonial au tournant du XX e siècle
Authors: De Oliveira Patrick Luiz Sullivan
Published: August 2022

Vers la fin du xix e  siècle, le ballon réapparaît dans l'espace public comme un symbole de la modernité fin-de-siècle. Cet article explique comment l'aristocratie française a participé à ce processus en aidant à créer une culture spectaculaire de l’aérostation. Les aéronautes aristocrates s’emparent du ballon pour cultiver une masculinité nationaliste qui les distingue des classes populaires tout en les présentant comme des ralliés au service de la nation dans le domaine de l'expansion impériale. En devenant les aéronautes les plus actifs du pays, des aristocrates comme Henry de La Vaulx ont signalé la pertinence de leur classe dans une période généralement conçue comme le début de son déclin. Bien que leurs efforts pour utiliser le ballon pour la gestion coloniale aient échoué, ils ont réussi à introduire l'aéronautique comme élément essentiel de la mission civilisatrice, semant les graines d'entreprises futures comme l'Aéropostale.
Topographie mystique et expériences chronotopiques dans La Peau de chagrin de Balzac
Authors: Lahmedi Moez
Published: August 2022

Certains espaces romanesques de La Peau de chagrin – la mansarde et le magasin d’antiquités – comportent un potentiel mystique que l’article s’attache à éclairer à la lumière de Swedenborg. Tremplins vers le « Monde Spirituel », ces deux locus constituent les cadres d’expériences chronotopiques qui réveillent le « Spécialiste » endormi en Raphaël et emportent son Être intérieur vers de nouvelles dimensions extra-temporelles. C’est donc en tant qu’éléments structurants, à la fois de la dispositio diégétique et de l’imaginaire mystique balzacien, que ces deux espaces sont ici étudiés.
A high-order numerical scheme for right Caputo fractional differential equations with uniform accuracy
Authors: Tian Li , Wang Ziqiang , Cao Junying
Published: August 2022

In this paper, we mainly study the high-order numerical scheme of right Caputo time fractional differential equations with uniform accuracy. Firstly, we construct the high-order finite difference method for the right Caputo fractional ordinary differential equations (FODEs) based on piecewise quadratic interpolation. The local truncation error of right Caputo FODEs is given, and the stability analysis of the right Caputo FODEs is proved in detail. Secondly, the time fractional partial differential equations (FPDEs) with right Caputo fractional derivative is studied by coupling the time-dependent high-order finite difference method and the spatial central second-order difference scheme. Finally, three numerical examples are used to verify that the convergence order of high-order numerical scheme is $ 3-\lambda $ in time with uniform accuracy.
Infusion rather than isolation: Integrating principles of equity, diversity, inclusion, decolonization, and Indigenization in toolkits for remote instruction during the COVID-19 pandemic
Authors: Attas Robin , Anstey Lauren , Brant Lindsay , McRae Karalyn
Published: August 2022

In the spring of 2020, our Centre for Teaching and Learning (CTL) developed the Transforming Teaching and Teaching Assistant Toolkits, consisting of in-house and curated open-access resources on various aspects of remote teaching, along with accompanying webinars. We deliberately infused principles of equity, diversity, and inclusion (EDI) and decolonization and Indigenization across all aspects of the resources for several reasons: our CTL’s commitment to these principles as institutional priorities that are the responsibility of all staff, numerous theorists’ advocacy to adopt inclusive pedagogies across the curriculum rather than tokenistic “add-and-stir” gestures, and a desire to counter the inequities in education and society at large re-exposed and perpetuated by the COVID-19 pandemic. We share our approach, explore its impact by outlining the toolkits’ design and delivery and by analyzing data from a survey of instructors who engaged with the toolkits, and propose some strategies for educational developers engaged in resource development to undertake their own infusion initiatives.
La réforme des organisations internationales de développement par le « modèle des parties prenantes »
Authors: Guilbaud Auriane
Published: August 2022

Cet article s’intéresse aux transformations des structures de gouvernance des organisations internationales intergouvernementales (OI) actives dans le champ du développement, qui s’ouvrent à la participation d’acteurs non-étatiques (ANE) considérés comme parties prenantes. En se focalisant sur deux cas d’études, celui de l’Organisation Mondiale de la Santé (OMS) et celui de l’Organisation des Nations Unies pour l’alimentation et l’agriculture (FAO), cet article montre en particulier que le tournant des années 2010 est marqué par l’intégration de dispositifs de participation des parties prenantes dans le cadre de réformes des OI au moins partiellement inspirées par le tournant participatif des politiques de développement et le nouveau management public. Si l’un des objectifs est de produire du consensus, voire de la convergence, entre des acteurs divers – et notamment de permettre la participation formelle et conventionnelle des entreprises à but lucratif –, cet article montre que ces dispositifs engendrent également de nouvelles opportunités de contestation transnationale.
Fabrication and Pulse Sequences Evaluation of Iron Oxides Nanoparticles as MRI Contrast Agent
Authors: Javid Muhammad Arshad , Afzal Hafiz M. Waseem , Khan Shahid , Buzdar Saeed Ahmad , Nadeem Muhammad
Published: August 2022

The objective of this in vivo study is to enhance the T2-weighted MRI contrast using superparamagnetic nanoparticles in liver and spleen of rabbits for biomedicine application. Superparamagnetic nanoparticles were synthesized using co-precipitation method. Superparamagnetic nanoparticles were characterized using SEM, EDX, VSM, magnetic resonance relaxation and magnetic resonance imaging (MRI). T1 and T2 relaxations were measured as function of concentration of contrast agents in liver and spleen. High relaxivity ratio r2/r1 showed the efficacy of prepared T2- weighted MRI contrast agent. Rabbits were anesthetized using xylazine and ketamine salts for medical procedure. Ketamine and xylazine were injected with the dose rate of ketamine 25-40 mg/kg and xylazine 2.5-5mg/kg intra-muscularly for veterinary anesthesia. MRI of albino rabbits was executed at 0.35 Tesla using magnetic nanoparticles. FDA approved, 0.2 ml/kg dose of contrast agents was injected in rabbits for MRI scanning. MRI axial and coronal, T1-W and T2-W images of liver and spleen were taken using Spin Echo (SE) at TE=92 and TR=551 and STIR at TE=24 and TR=5170. Spin software was used to estimate the intensity of signal in region of interest induced by magnetic contrast agent. In vivo, MRI study of magnetic contrast agents demonstrated the high T2 -weighted contrast on MRI images of liver and spleen of rabbits. This research also concludes that superparamagnetic nanoparticles may be used as MRI contrast agents for biomedicine application to see the pathology of living organs even at low tesla field.
Transient Numerical Simulation the Friction Stir Welding Process of Aa 2017 Alloys, Contact Parameter Effects on Thermal History and Material Flow
Authors: Boukraa Moustafa , Chekifi Tawfiq
Published: August 2022

The present work is a 3D transient numerical simulation of material flow and heat transfer during the FSW process. The equations of energy, conservation of mass and momentum were solved in the Eulerian coordinate, in which the spatially variable thermo-physical properties and the non-Newtonian viscosity for the flow of material was calculated taking into account the deformation velocity, the temperature and the properties of the material depending on the temperature. In the purpose of calibrating the proposed model, the effects of contact conditions at the tool / work-piece interface such as the friction coefficient and the slip coefficient on thermal cycles, distribution and the evolution of the maximum value of the temperature have been studied. However, the results obtained show a significant asymmetry of the temperature and mass distribution. Convective heat transport was an important heat transfer mechanism near the tool surface. Furthermore, the numerically simulated temperature value, cooling rates and the length of the thermo-mechanically and thermally affected zone increase with increasing slip coefficient.
Synthesis of Silver Nanoclusters from Melia azedarach and their Usage for Catalytic Degradation of Variable Organic Dyes
Authors: Munib Wajeeha
Published: August 2022

Silver nanoclusters (AgNCs) were synthesized from leaf extract of Melia azedarach by top-bottom green synthetic route. The confirmation of yellowish liquid of synthesized silver nanoclusters was done by UV/Vis spectroscopy. After the calcination of liquid silver nanoclusters at 550°C, green powdered AgNCs were further characterized for their metallic nature, size, and morphology by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), nanoZetasizer (NZ) and Fourier Transform Infrared Spectroscopy (FT-IR) respectively. Phytochemical analysis of leaves extract reveals that the hydrolyzable phenolic acids bioactive molecules are responsible for the reduction of silver metal ion to silver nanoclusters. The silver nanoclusters in presence of sodium borohydride reducing agent were utilized as a catalyst for degradation of toxic organic dyes into their non-toxic derivatives. The catalytic reactions were done under controlled temperature and pH conditions and were characterized by Fourier Transform Infrared Spectroscopy
Influence of Ti on Oxide Formation During Isothermal Oxidation of 800H Ni-Based Alloys
Authors: Parimin Noraziana , Hamzah Esah
Published: August 2022

In this research, a 800H Ni-based alloy was experienced a solution treatment procedure at two different temperatures. The solution-treated alloys were undergo a high-temperature oxidation under isothermal conditions at 500°C for 500 hours in laboratory air. The alloy was characterized using OES, XRD, SEM and FESEM equipped with an EDX spectrometer. It was found that the solution-treated alloy at 950°C produced a small grain size, and alloy treated at 1100°C produced a large grain size. The XRD results show that various oxides phases were detected. The oxidation kinetics followed the parabolic rate law indicating the oxide was formed based on diffusion-controlled oxide growth rate. The alloys with small grain sizes exhibited a lower oxidation rate, hence have excellent oxidation resistance. This is due to the accessibility of the high ion diffusion route through the grain boundaries of small-grained alloy and thus permits the speedy establishment of the initial oxide layer. Uniform oxide scale formed on a small-grained oxidized sample with visible overgrow discrete oxide particle comprised of Ti-rich oxide. The large-grained oxidized sample indicates evidence of oxide exfoliation indicating poor oxidation protection.
Experimental Study on Steel Industry Waste as Aggregate in Concrete for a Sustainable Development
Authors: Verma Kshitij D. , Kondraivendhan B. , Verma Shilpi , Gupta Mukul
Published: August 2022

Steel industry generate various kind of industrial waste, by-product after extracting final product as steel, depends on different types of ore refining methods. This research aims to identify experimentally, sustainable building material solution from waste to ingest in construction field centered on previous effort and literatures. EAF (Electric arc furnace) slag, a kind ofwaste material has an excellent potential to replace the natural coarse aggregate in concrete. The evaluation of the physical, chemical & microstructure properties of EAF slag as aggregate shows reasonably enhanced results. The M-50 grade of concrete was designed with various EAF slag replaced (0, 25, 50, 72, 100%) in place of natural coarse aggregate. It is observed thatfresh and hardened concretewith 50% EAF slag replacement exhibits outstanding performance over conventional concrete.
Orbital and conjunctival nontuberculous mycobacteria infection
Authors: Kuo Chin-Tzu , Chen Yen-Ta , Tsai I-Lun , Tsai Ching-Yao , Chen Zoe Tzu-Yi
Published: August 2022

A 64-year-old female developed refractory red-eye with itching and watery discharge 2 weeks after being injured by a comb in the left eye. It presented as diffuse pinkish thickening of the bulbar conjunctiva. Biopsy and histological examinations revealed granulomatous inflammation with microgranuloma. Acid-fast-positive bacilli were found within the tissue, which was identified by culture 5 weeks later as Mycobacterium
Abscessus. The orbital computed tomography with contrast medium showed irregular enhancement with an ill-defined margin along the inferior sclera. Due to symptomatic and recurrent bulbar conjunctival thickening and abscess-like lesion formations, wide excision of the conjunctival and orbital granuloma with amniotic membrane transplantation was performed twice. Conjunctiva inflammation subsided after the surgical treatment was combined with 4 months of topical and parenteral antimycobacterial treatment. The presentation, diagnosis, and treatment of ocular nontuberculous mycobacterial (NTM) infection will be discussed in this article. NTM can cause infections of all adnexal and ocular tissues in patients with ocular trauma or surgical history. The pathological findings were granulomatous inflammation without true caseating. Periocular cutaneous, adnexal, and orbital NTM infections remain rare and require surgical debridement and long-term parenteral antibiotic therapy.
Metastatic esophageal carcinoma to the eye masquerading as inflammatory vitreo-retinitis: A case report and literature review
Authors: Shehada Reham , Turfa Rim , Ibrahimi Ahmad K. H. , Khzouz Jakub , Gharaibeh Azza , Yousef Yacoub A. , Mohammad Mona
Published: August 2022

We report an unusual case of metastatic esophageal carcinoma to the vitreous associated with focal retinitis in a 44-year-old male. A 44-year-old male patient, known case of locally advanced esophageal carcinoma, presented with a 3-day history of left eye floaters. The initial diagnosis was inflammatory vitreo-retinitis that responded to systemic steroids. Four months later, the patient presented with relapsed intraocular inflammation, vitreous biopsy using a 25G needle was performed, and cytology confirmed the presence of metastatic carcinoma consistent with his primary esophageal cancer. The patient received external beam radiotherapy to his ocular and brain metastasis, and his eye examination was stable. Five months later, the patient passed away due to progressive brain metastasis.