bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhanced photoluminescence intensity of buried InGaAs/GaAs(001) quantum wells by sulfur termination
Authors: Ma Zhao , Mano Takaaki , Ohtake Akihiro , Kuroda Takashi 
Published: November 2024

Abstract
Sulfur (S) termination of III–V semiconductor surfaces is an effective technique for passivating surfaces to prevent oxidation. In this study, we systematically investigated the effects of S termination by (NH4)2S
x
treatment on enhancement of the photoluminescence (PL) properties of buried InGaAs/GaAs(001) quantum wells (QWs). X-ray photoelectron spectroscopy (XPS) and PL measurements revealed that the (NH4)2S
x
treatment suppresses the formation of surface oxides, especially arsenic oxides, and enhances the PL intensity of QWs. Clear correlation between the PL and XPS results suggests that greater PL intensity is attributable to a reduction in the number of nonradiative recombination centers at the surface caused by arsenic oxide formation. In addition, from the observed temporal changes in PL intensities, we found that the S-terminated surfaces exhibit long-term and high resistance to surface oxidation by air exposure.
Portraits of Contemporaries in Nikolai Dronnikov’s Prints
Authors: Romanova Elena O. 
Published: November 2024

The portraits by artist Nikolai Dronnikov (b. 1930) of prominent Russian artists and cultural figures who have resided in or visited Paris throughout the last forty years are the subject of this article. These graphic portraits belong to the rare genre of croquis portrait; however, they are complete works of art. The artist presents them to the viewer in his small-­format books, published in limited editions on his own printing press. Owing to Dronnikov's creative method, which involves creating numerous instantaneous portrait sketches of his subjects while observing them in various situations, hundreds of artistic images of representatives of Russian culture in France, characterised by the authenticity of the image at a specific moment, have been created.
Living in Paris, N. Dronnikov developed his talent, enriching the artistic education he received at the Moscow Surikov State Academic Institute of Fine Arts with French culture. Among the artists of the past whose work served as a starting point for his art of portrait drawing, he cites the classics of Flemish and German art. At the same time, his artworks are organically integrated into the drawing tradition of the representatives of the Paris School.
Kajian Perilaku Eksperimental – Analisis FEM Balok Beton Bertulang Berserat Baja Sebagai Pengganti Sebagian Tulangan Geser
Authors: Ryanto Muhamad , Amir Antonius , Setiawan Prabowo 
Published: November 2024

Kekuatan kapasitas geser balok beton dapat ditingkatkan dengan penggunaan serat baja tipe ujung bengkok pada campuran beton. Penelitian ini bertujuan untuk mengevaluasi pengaruh penambahan serat baja dengan tipe ujung bengkok pada beton terhadap kapasitas geser balok beton bertulang. Pembuatan benda uji dibuat berupa balok bertulangan dengan/tanpa tulangan sengkang. Variabel-variabel yang digunakan : rasio air/semen (w/c = 0.50), dan volume serat (Vf) = 0.0%, 0.5%, 1.0% dan 2%. Hasil penelitian diperoleh bahwa kekuatan kapasitas geser balok yang diperkuat serat lebih besar daripada kekuatan balok beton polos dan cenderung meningkat seiring dengan penambahan serat baja pada kandungan beton seiring dengan peningkatan jumlah fraksi volume serat. Perbandingan data eksperimental dan model analisis kekuatan menunjukkan bahwa model analitis dapat memprediksi efek w/c, Vf, dan kontribusi tulangan baja longitudinal dan transversal secara memadai. Hasil beban ultimit yang diperoleh pada analisis model FE nilai gaya geser ultimit secara keseluruhan lebih rendah dibanding dengan hasil eksperimen. Bentuk pola keretakan/keruntuhan yang didapati hasil analisis model FE terlihat tidak jauh beda dengan hasil eksperimen.
Pilotage des flux de savoirs dans le Métavers
Authors: Rollet Anne 
Published: November 2024

Face à une « économie du savoir », dynamisée par l’évolution des technologies, la rapidité des innovations… les savoirs ne peuvent plus être abordés dans une logique de stock. L'industrie 4.0 gagne à penser la production et la maintenance des compétences dans une logique de flux de savoirs. Cet avis d’expert s’appuie sur les valeurs et les compétences de l’écosystème autour de l’entreprise Immersive-CoLab et questionne le Métavers Solidaire, ses outils et ses méthodes pour soutenir une approche par les flux et ainsi renouveler le management des compétences des organisations. La présentation des avantages et des inconvénients de cette solution aborde l’acculturation nécessaire et l’apprentissage à la créativité grâce au « Do It Yourself ».
Share Price Performance of Banking Issuers After Dividend Cum-Date
Authors: Rahman Failur , Yunus Santi , Paskual Meity F , Achmad Nuryana Hapirin Dj , Cicilia Vera Sri Endah 
Published: November 2024

The primary objective of this analysis is to examine the fluctuations in stock prices post dividend distribution, and to evaluate how dividends affect stock performance over a one-year period following their allocation. Statistical analysis using the Paired Sample T-Test is employed to assess time series data in this study. The sample used consists of seven banking issuers, namely BBCA, BBNI, BBRI, BMRI, BTPN, MEGA, and BNGA. The study findings suggest that there is a slight decrease in the performance of banking stock prices the day following the dividend cumdate, though not enough to be considered significant. However, a noticeable difference in share price performance among banking issuers is evident between three months and a year. This was obtained after conducting a paired sample t-test with a result of 0.032. The contraction of stock price performance at cum date in some companies at a certain time, resulting in stock prices falling within a few days. Some of the decline in stock prices after the cum date occurred only a few days or even less than one month, but there were several companies that experienced a longer decline or tended to experience a negative trend for a long time.
BASS. XLI. The Correlation between Mid-infrared Emission Lines and Active Galactic Nuclei Emission
Authors: Bierschenk M. , Ricci C. , Temple M. J. , Satyapal S. , Cann J. , Xie Y. , Diaz Y. , Ichikawa K. , Koss M. J. , Bauer F. E. , Rojas A. , Kakkad D. , Tortosa A. , Ricci F. , Mushotzky R. , Kawamuro T. , Gupta K. K. , Trakhtenbrot B. , Chang C. S. , Riffel R. , Oh K. , Harrison F. , Powell M. , Stern D. , Urry C. M. 
Published: November 2024

Abstract
We analyze Spitzer spectra of 140 active galactic nuclei (AGN) detected in the hard X-rays (14–195 keV) by the Burst Alert Telescope on board Swift. This sample allows us to probe several orders of magnitude in black hole masses (106–109
M
⊙), Eddington ratios (10−3–1), X-ray luminosities (1042–1045 erg s−1), and X-ray column densities (1020–1024 cm−2). The AGN emission is expected to be the dominant source of ionizing photons with energies ≳50 eV, and therefore, high-ionization mid-infrared (MIR) emission lines such as [Ne v] 14.32, 24.32 μm and [O iv] 25.89 μm are predicted to be good proxies of AGN activity, and robust against obscuration effects. We find high detection rates (≳85%–90%) for the MIR coronal emission lines in our AGN sample. The luminosities of these lines are correlated with the 14–150 keV luminosity (with a typical scatter of σ ∼0.4–0.5 dex), strongly indicating that the MIR coronal line (CL) emission is driven by AGN activity. CLs are also tightly correlated to the bolometric luminosity (σ ∼0.2–0.3 dex), calculated from careful analysis of the spectral energy distribution. We find that the relationship between the CL strengths and L
14–150 keV is independent of black hole mass, AGN luminosity, and Eddington ratio, and mostly not affected by high X-ray column densities. This confirms that the MIR CLs can be used as unbiased tracers of the AGN power for X-ray luminosities in the 1042–1045 erg s−1 range.
Eridanus III and DELVE 1: Carbon-rich Primordial Star Clusters or the Smallest Dwarf Galaxies?*
Authors: Simon Joshua D. , Li Ting S. , Ji Alexander P. , Pace Andrew B. , Hansen Terese T. , Cerny William , Escala Ivanna , Koposov Sergey E. , Drlica-Wagner Alex , Mau Sidney , Kirby Evan N. 
Published: November 2024

Abstract
We present spectroscopy of the ultra-faint Milky Way satellites Eridanus III (Eri III) and DELVE 1. We identify eight member stars in each satellite and place nonconstraining upper limits on their velocity and metallicity dispersions. The brightest star in each object is very metal poor, at [Fe/H] = −3.1 for Eri III and [Fe/H] = −2.8 for DELVE 1. Both of these stars exhibit large overabundances of carbon and very low abundances of the neutron-capture elements Ba and Sr, and we classify them as CEMP-no stars. Because their metallicities are well below those of the Milky Way globular cluster population, and because no CEMP-no stars have been identified in globular clusters, these chemical abundances could suggest that Eri III and DELVE 1 are dwarf galaxies. On the other hand, the two systems have half-light radii of 8 pc and 6 pc, respectively, which are more compact than any known ultra-faint dwarfs. We conclude that Eri III and DELVE 1 are either the smallest dwarf galaxies yet discovered, or they are representatives of a new class of star clusters that underwent chemical evolution distinct from that of ordinary globular clusters. In the latter scenario, such objects are likely the most primordial star clusters surviving today. These possibilities can be distinguished by future measurements of carbon and/or iron abundances for larger samples of stars or improved stellar kinematics for the two systems.
Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. II. Understanding Prominence Eruption through Data-driven Modeling and Observed Magnetic Environment
Authors: Namekata Kosuke , Ikuta Kai , Petit Pascal , Airapetian Vladimir S. , Vidotto Aline A. , Heinzel Petr , Wollmann Jiří , Maehara Hiroyuki , Notsu Yuta , Inoue Shun , Marsden Stephen , Morin Julien , Jeffers Sandra V. , Neiner Coralie , Paudel Rishi R. , Avramova-Boncheva Antoaneta A. , Gendreau Keith , Shibata Kazunari 
Published: November 2024

Abstract
EK Draconis, a nearby young solar-type star (G1.5V, 50–120 Myr), is known as one of the best proxies for inferring the environmental conditions of the young Sun. The star frequently produces superflares, and Paper I presented the first evidence of an associated gigantic prominence eruption observed as a blueshifted Hα Balmer line emission. In this paper, we present the results of the dynamical modeling of the stellar eruption and examine its relationship to the surface starspots and large-scale magnetic fields observed concurrently with the event. By performing a 1D freefall dynamical model and a 1D hydrodynamic simulation of the flow along the expanding magnetic loop, we found that the prominence eruption likely occurred near the stellar limb (12

−
5

+
5

-16

−
7

+
7

degrees from the limb) and was ejected at an angle of

15

−
5

+
6

-24

−
6

+
6

degrees relative to the line of sight, and the magnetic structures can expand into a coronal mass ejection. The observed prominence displayed a terminal velocity of ∼0 km s−1 prior to disappearance, complicating the interpretation of its dynamics in Paper I. The models in this paper suggest that prominence’s Hα intensity diminishes at around or before its expected maximum height, explaining the puzzling time evolution in observations. The Transiting Exoplanet Survey Satellite light curve modeling and (Zeeman) Doppler Imaging revealed large midlatitude spots with polarity inversion lines and one polar spot with dominant single polarity, all near the stellar limb during the eruption. This suggests that midlatitude spots could be the source of the gigantic prominence we reported in Paper I. These results provide valuable insights into the dynamic processes that likely influenced the environments of early Earth, Mars, Venus, and young exoplanets.
Applying the Velocity Gradient Technique in NGC 1333: Comparison with Dust Polarization Observations
Authors: Soam Archana , Yuen Ka Ho , Stephens Ian , Law Chi Yan , Ho Ka Wai , Coudé Simon 
Published: November 2024

Abstract
Magnetic fields (B-fields) are ubiquitous in the interstellar medium (ISM), and they play an essential role in the formation of molecular clouds and subsequent star formation. However, B-fields in interstellar environments remain challenging to measure, and their properties typically need to be inferred from dust polarization observations over multiple physical scales. In this work, we seek to use a recently proposed approach called the velocity gradient technique (VGT) to study B-fields in star-forming regions and compare the results with dust polarization observations in different wavelengths. The VGT is based on the anisotropic properties of eddies in magnetized turbulence to derive B-field properties in the ISM. We investigate that this technique is synergistic with dust polarimetry when applied to a turbulent diffused medium for the purpose of measuring its magnetization. Specifically, we use the VGT on molecular line data toward the NGC 1333 star-forming region (12CO, 13CO, C18O, and N2H+), and we compare the derived B-field properties with those inferred from 214 and 850 μm dust polarization observations of the region using Stratospheric Observatory for Infrared Astronomy/High-Resolution Airborne Wide-band Camera Plus and James Clerk Maxwell Telescope/POL-2, respectively. We estimate both the inclination angle and the 3D Alfvénic Mach number M
A from the molecular line gradients. Crucially, testing this technique on gravitationally bound, dynamic, and turbulent regions, and comparing the results with those obtained from polarization observations at different wavelengths, such as the plane-of-sky field orientation, is an important test on the applicability of the VGT in various density regimes of the ISM. We in general do not find a close correlation between the velocity gradient inferred orientations and the dust inferred magnetic field orientations.
Dark Photon Dark Matter and Low-frequency Gravitational-wave Detection with Gaia-like Astrometry
Authors: An Haipeng , Li Tingyu , Shu Jing , Wang Xin , Xue Xiao , Zhao Yue 
Published: November 2024

Abstract
Astrometric surveys offer us a method for searching for elusive cosmic signatures, such as ultralight dark photon dark matter and gravitational waves (GWs), by observing the temporal change of stars’ apparent locations. The detection capabilities of such surveys rapidly decrease at low frequencies, because the signals become hardly distinguishable from the background motion of stars. In this work, we find that the background motion can be well described by a linear model over time, based on which we propose a linear background subtraction scheme. Compared to the conventional quadratic subtraction, the advantage of linear subtraction emerges within the frequency range below 6 × 10−9 Hz. Taking dark photons with purely gravitational interactions, dark photons with additional U(1)
B
or U(1)
B−L
gauge interactions, and low-frequency GWs as examples, we illustrate that the linear subtraction scheme can result in an enhancement of more than 1 order of magnitude in the exclusion limits of Gaia-like experiments in the low-frequency range.
Probing the High-frequency Variability of NGC 5044: The Key to Active Galactic Nucleus Feedback
Authors: Schellenberger Gerrit , O’Sullivan Ewan , David Laurence P. , Vrtilek Jan , Romero Charles , Petitpas Glen , Forman William , Giacintucci Simona , Gurwell Mark , Jones Christine , Rajpurohit Kamlesh , Ubertosi Francesco , Venturi Tiziana 
Published: November 2024

Abstract
The active galactic nucleus (AGN) feeding and feedback process in the centers of galaxy clusters and groups is still not well understood. NGC 5044 is the ideal system in which to study AGN feedback. It hosts the largest known reservoir of cold gas in any cool-core galaxy group, and features several past epochs of AGN feedback imprinted as cavities in the X-ray-bright intragroup medium, as well as parsec-scale jets. We present Submillimeter Array, Karl G. Jansky Very Large Array, James Clerk Maxwell Telescope, and Atacama Large Millimeter/submillimeter Array high-frequency observations of NGC 5044 to assess the time variability of the millimeter-wave band emission from the accretion disk, and quantify the spectral energy distribution (SED) from the radio to submillimeter band. The SED is well described by an advection-dominated accretion flow (ADAF) model and self-absorbed jet emission from an aging plasma with τ ∼ 1 kyr. We find a characteristic variability timescale of 150 days, which constrains the ADAF emission region to about 0.1 pc, and the magnetic field to ∼4.7 mG in the jets and 870 G in the accretion disk. Longer monitoring/sampling will allow to understand if the underlying process is truly periodic in nature.
The IMF Clock Angle Effect on the Tail Cross Section of the Martian Magnetic Pileup Boundary and Bow Shock
Authors: Yuan 袁 Y. K. 义铠 , Wang 王 M. 明 , Lu 吕 J. Y. 建永 , Chen 陈 J. H. 静涵 , Cheng 程 N. 诺 
Published: November 2024

Abstract
Using a three-dimensional global magnetohydrodynamic (MHD) simulation model, we investigate the effects of different interplanetary magnetic field (IMF) clock angles on the tail configuration of the Martian magnetic pileup boundary (MPB) and bow shock (BS). The study reveals the following: (1) The cross sections of the tail MPB and BS are approximately elliptical. The MPB tail cross section generally elongates in the direction of the IMF clock angle, whereas the BS tail cross section is roughly elongated perpendicular to the IMF clock angle direction. (2) An IMF with a northward component can cause the tail cross section of the MPB to shift slightly to the south when the intense crustal magnetic fields are located on the dayside. (3) As the tail distance from Mars increases, the eccentricity of the cross section ellipses of both the MPB and BS tail increases, as well as the major and minor axes. Additionally, the major and minor axes of the tail MPB’s cross section ellipses begin to decrease at the far magnetotail, suggesting that the Martian MPB tail might be a closed structure on the nightside.
ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8
Authors: Fujimoto Seiji , Kohno Kotaro , Ouchi Masami , Oguri Masamune , Kokorev Vasily , Brammer Gabriel , Sun Fengwu , González-López Jorge , Bauer Franz E. , Caminha Gabriel B. , Hatsukade Bunyo , Richard Johan , Smail Ian , Tsujita Akiyoshi , Ueda Yoshihiro , Uematsu Ryosuke , Zitrin Adi , Coe Dan , Kneib Jean-Paul , Postman Marc , Umetsu Keiichi , Lagos Claudia del P. , Popping Gergö , Ao Yiping , Bradley Larry , Caputi Karina , Dessauges-Zavadsky Miroslava , Egami Eiichi , Espada Daniel , Ivison R. J. , Jauzac Mathilde , Knudsen Kirsten K. , Koekemoer Anton M. , Magdis Georgios E. , Mahler Guillaume , Muñoz Arancibia A. M. , Rawle Timothy , Shimasaku Kazuhiro , Toft Sune , Umehata Hideki , Valentino Francesco , Wang Tao , Wang Wei-Hao 
Published: November 2024

Abstract
We present a statistical study of 180 dust continuum sources identified in 33 massive cluster fields by the Atacama Large Millimeter/submillimeter Array Lensing Cluster Survey (ALCS) over a total of 133 arcmin2 area, homogeneously observed at 1.2 mm. ALCS enables us to detect extremely faint millimeter sources by lensing magnification, including near-infrared (NIR) dark objects showing no counterparts in existing Hubble Space Telescope and Spitzer images. The dust continuum sources belong to a blind sample (N = 141) with signal-to-noise ratio (S/N) ≳ 5.0 (a purity of >0.99) or a secondary sample (N = 39) with S/N = 4.0–5.0 screened by priors. With the blind sample, we securely derive 1.2 mm number counts down to ∼7 μJy, and find that the total integrated 1.2 mm flux is

20.7

−
6.5

+
8.5

Jy deg−2, resolving ≃80% of the cosmic infrared background light. The resolved fraction varies by a factor of 0.6–1.1 due to the completeness correction depending on the spatial size of the millimeter emission. We also derive infrared (IR) luminosity functions (LFs) at z = 0.6–7.5 with the

1

/

V

max

method, finding the redshift evolution of IR LFs characterized by positive luminosity and negative density evolution. The total (= UV + IR) cosmic star formation rate density (SFRD) at z > 4 is estimated to be

161

−
21

+
25

% of the Madau and Dickinson measurements mostly based on rest-frame UV surveys. Although our general understanding of the cosmic SFRD is unlikely to change beyond a factor of 2, these results add to the weight of evidence for an additional (≈60%) SFRD component contributed by the faint millimeter population, including NIR-dark objects.
Two Intriguing Transits of HIP 23309 Observed by TESS
Authors: Gollotti Giovanni A. , Tzanidakis Anastasios , Wainer Tobin M. , Davenport James R. A. 
Published: November 2024

Abstract
We present two distinct dips in the Transiting Exoplanet Survey Satellite light curves for HIP 23309, a young, active M0 dwarf, which has been previously identified as a potential exoplanet host candidate. We characterize both dips, and archival radial velocity data from ESO's High Accuracy Radial velocity Planet Searcher spectrograph, providing limits on a potential companion. Currently, we are unable to confirm the existence of a companion, or if the transits are caused by stellar variability.
Histoire du Japon
Authors: Okazaki Ayanori 
Published: November 2024

Initialement paru en 1958 dans le contexte de l’après-guerre et des politiques néo-malthusiennes menées par le Japon depuis 1945, cet ouvrage est une remarquable synthèse de l’histoire démographique du pays. Le Japon, dramatiquement préoccupé par le déclin de sa population, fut en effet le premier pays à avoir créé un institut entièrement consacré aux questions de population. Au sortir de la Seconde Guerre mondiale et dans le prolongement de préoccupations déjà présentes à la création de l’Institut national des problèmes de population (INPP) en 1939, le thème de la surpopulation domine, accompagnant en cela les politiques de restriction des naissances. Produit d’une collaboration fructueuse entre l’Ined et l’INPP, cet ouvrage, qui fut rédigé par Ayanori Okazaki, éminent spécialiste, est l’aboutissement de plusieurs années de réflexion sur la situation démographique du Japon. Le Japon va devenir très vite l’une des grandes puissances mondiales et sortir, dès la fin des années 1950, de son retard de développement. Retraçant cette histoire depuis les débuts, l’ouvrage permet de comprendre en quoi les préoccupations démographiques et, à certaines époques, natalistes, ont toujours dominé les politiques sociales. Il offre le recul nécessaire pour appréhender l’histoire singulière d’un pays qui fait aujourd’hui face à un déclin démographique sans précédent. La préface d’Isabelle Konuma décrit le contexte de sa publication et des interactions entre l’INPP et l’Ined. La postface, rédigée par Éva Lelièvre, offre une actualisation a posteriori des projections établies à l’époque sur les cinquante années qui ont suivi.
Le dessin comme médiateur du sensible
Authors: Borsus Isabelle 
Published: November 2024

Dans cette contribution, je propose de m'attarder sur quelques moments ayant ponctué mon « cheminement perceptif » (Wathelet et Candau 2013) auprès de deux taxidermistes rencontrés dans le cadre d’une recherche autour de la modélisation du vivant comme révélatrice de nos rapports à la nature. Ce cheminement a en effet été ponctué par l’utilisation du dessin comme outil ethnographique et par une réflexion sur la place que pouvait occuper cette technique pour accéder et rendre compte du sensible tant dans le travail du taxidermiste que dans ma propre recherche. Nous découvrirons ainsi comment l'usage du dessin a pu révéler sa richesse comme médiateur (Hennion 2007, 2015 ; Escallier 2016), offrant une porte à des savoirs incorporés, parfois difficilement transmissibles par le langage parlé.