bluuebunny/crossref_metadata_2025_split huggingface dataset:
Affinity and Petrogenesis of the Huzyk Creek Metal-Enriched Graphite Deposit: A Metamorphosed Metalliferous Black Shale in the Trans-Hudson Orogen Of Manitoba, Canada
Authors: Couëslan Chris G. 
Published: February 2023

ABSTRACT
The Huzyk Creek area is situated along the boundary between the Reindeer Zone and the Superior Boundary Zone of the Paleoproterozoic Trans-Hudson Orogen, where the Precambrian rocks are overlain by Phanerozoic cover. Two drill holes intersect graphite schist that is enriched in V, as well as U, Zn, Mo, and Cu, and is hosted by a metamorphosed wacke-mudstone sequence interleaved with variably altered mafic rocks. Whole-rock lithogeochemistry and Sm-Nd isotope chemistry suggest that the wacke-mudstone package is related to the turbidite-derived Burntwood Group of the Kisseynew Domain and was likely deposited relatively proximal to the Flin Flon arc-collage. A model is proposed in which redox-sensitive metals were leached from rocks of the Flin Flon arc-collage during weathering under oxidizing conditions. The metals were transported in oxygenated surface run-off draining the arc-collage and discharged into the Kisseynew Basin. Shallow waters of the Kisseynew Basin were likely oxygenated and biologically productive; however, the basin was likely euxinic at mid-depths. The mixing of the metal-enriched, oxygenated water with organic matter and euxinic water resulted in the reduction of the redox-sensitive metals and the formation of insoluble organometallic complexes and particles. A highstand, or period of tectonic quiescence, likely halted turbidite deposition and allowed for the settling organic and metal-rich particles to create relatively thick deposits. Burial and metamorphism resulted in the organic-rich material being transformed into graphite, while Mo, Cu, and Zn were partitioned into sulfides. The mineral hosts of V and U are not known at this time. The model calls for the fractionation of redox-sensitive metals from the water column shortly after discharge into the Kisseynew Basin and implies that graphitic horizons in relatively close proximity to the Flin Flon arc-collage have a greater potential for metal enrichment than graphite deposits farther removed from the arc. This model could apply to basins of similar metamorphic grade, age, and tectonic setting around the globe.
Simulative Testumgebung für eine Matrixproduktion/Simulative test environment for a matrix production - Digital sandbox solution for connecting AI-based software and hardware modules
Authors: Borgmann Felix , Kalbe Nils , Moroff Nikolas , Schreiber Lucas 
Published: February 2023

Um die Flexibilitätspotenziale einer Matrixproduktion zu nutzen, ist eine intelligente Steuerung und Anpassungsplanung und damit die Integration der Anlagen- und Produktionssystemebene erforderlich. Mit dem Ansatz einer Sandbox-Lösung als digitale Testumgebung lassen sich unterschiedliche simulationsbasierte KI-Module zur (Re-)Konfiguration einer Matrixproduktion sowie von Anlagenmodulen in Form eines digitalen Zwillings testen sowie zur iterativen Optimierung des realen Produktionssystems nutzen.

Exploiting the potential flexibility of a matrix production requires intelligent adjustment planning and control and thus to integrate the plant and production system level. The sandbox solution as a digital test environment allows for testing different simulation-based AI modules for (re-)configuration of a matrix production as well as plant modules in the form of a digital twin and using them for iterative optimization of the real production system.
Smarte Schmierstellenüberwachung für Maschinen/Smart lubrication monitoring for machines
Authors: Kuhn Christian , Hermann Julian , Lucke Dominik 
Published: February 2023

Das regelmäßige Schmieren von Maschinen verhindert Schäden, reduziert Ausfallzeiten und vermeidet Reparaturkosten. Schmiervorgänge werden jedoch oft unzureichend dokumentiert. Für die Überwachung manueller Schmierprozesse an Maschinen wird daher eine Smart-Maintenance-Lösung aufgebaut. Zusätzlich wird eine intelligente Fettpresse als cyber-physisches System entwickelt. Dadurch lassen sich Schmiervorgänge transparent dokumentieren und Fehlschmierungen verhindern.

Regularly lubricating machines prevents damage, reduces downtime and avoids repair costs. However, lubrication processes are often insufficiently documented. For this reason, a smart maintenance solution is developed for monitoring of manual lubrication processes on machines. In addition, an intelligent grease gun is being developed as a cyber-physical system. This allows lubrication processes to be transparently documented and incorrect lubrication to be prevented.
Emissionsminderung beim Laserauftragschweißen/Emission reduction in wire-based laser metal deposition
Authors: Gräfe Stefan , Paulus Rebecca , Day Robin , Bergs Thomas , Wohter Daniel 
Published: February 2023

Beim drahtbasierten Laserauftragschweißen (LMD-w) werden gesundheits- und umweltschädliche Schweißrauchpartikel freigesetzt, deren Gefährdungspotenzial von der chemischen Zusammensetzung sowie der Partikelanzahl und -größe abhängt. Unter Verwendung eines statistischen Versuchsplans werden die Emissionen charakterisiert und die Abhängigkeit von relevanten Prozessfaktoren bestimmt. Daraus werden prozessintrinsische Maßnahmen zur Emissionsminderung abgeleitet.

Wire-based laser metal deposition (LMD-w) releases welding fume particles that are harmful to health and the environment. The potential hazard depends on the chemical composition as well as particle number and size. Using a statistical design of experiments, the emissions are characterized and the dependence on relevant process factors is determined. From this, process-intrinsic measures for emission reduction are derived.
Einlaufverhalten fein- und poliergeschliffener Zahnflanken/Influence of fine- and polish-grinding on tooth flank roughness after running-in
Authors: Lang Martin , Schrank Maximilian , Solf Mareike , Brimmers Jens , Bergs Thomas 
Published: February 2023

Zur Steigerung der Zahnflankentragfähigkeit werden Zahnräder vermehrt fein- oder poliergeschliffen. Allerdings existieren bislang keine Erkenntnisse darüber, welchen Einfluss die Prozesse bei gleicher Zahnflankenrauheit auf das Einlaufverhalten von Verzahnungen haben.

To increase the load carrying capacity of tooth flanks, gears are increasingly fine- or polish-ground. However, there is hardly any knowledge about how these processes influence the running-in behavior of gears with the same tooth flank roughness.
I forgot that I forgot: PTSD symptom severity in a general population correlates with everyday diary-recorded prospective memory failures
Authors: Swain Taylor L. , Keeping Catherine A. , Lewitzka Sarah , Takarangi Melanie K. T. 
Published: February 2023

AbstractExtant research suggests a complex relationship between prospective memory (PM) and post-traumatic stress disorder (PTSD) symptom severity. In a general population, this relationship exists for self-report assessment but not objective, in-lab PM performance (e.g., pressing a certain key at a particular time, or when particular words appear). However, both these measurement methods have limitations. Objective, in-lab PM tasks might not represent typical everyday performance, while self-report measurement might be biased by metacognitive beliefs. Thus, we used a naturalistic diary paradigm to answer the overarching question: are PTSD symptoms associated with PM failures in everyday life? We found a small positive correlation between diary-recorded PM errors and PTSD symptom severity (r = .21). Time-based tasks (i.e., intentions completed at a particular time, or after a specified time has elapsed; r = .29), but not event-based tasks (i.e., intentions completed in response to an environmental cue; r = .08), correlated with PTSD symptoms. Moreover, although diary-recorded and self-report PM correlated, we did not replicate the finding that metacognitive beliefs underpin the PM-PTSD relationship. These results suggest that metacognitive beliefs might be particularly important for self-report PM only.
Disintegration of Long-period Comet C/2021 A1 (Leonard)
Authors: Jewitt David , Kim Yoonyoung , Mattiazzo Michael , Mutchler Max , Li Jing , Agarwal Jessica 
Published: February 2023

Abstract
We present imaging observations of the disintegrating long-period comet C/2021 A1 (Leonard). High-resolution observations with the Hubble Space Telescope show no evidence for surviving fragments, and place a 3σ upper limit on their possible radius of ∼60 m (albedo 0.1 assumed). In contrast, wide-field observations from the Swan Hill Observatory, Australia, show an extensive debris cloud, the cross section and estimated mass of which are consistent with complete disintegration of the nucleus near 2021 mid-December (at about 0.8 au). Two methods give the pre-disruption radius of the nucleus, r

n
= 0.6 ± 0.2 km. Tidal, collisional, sublimation, and pressure-confined explosion models provide implausible explanations of the disintegration. However, rotational instability driven by outgassing torques has a very short timescale (∼0.1 yr) given the orbit and size of the nucleus of C/2021 A1, and offers the most plausible mechanism for the disruption. Initial rotational breakup is accelerated by the exposure and strong sublimation of previously buried volatiles, leading to catastrophic destruction of the nucleus.
Single- and Double-electron Capture Cross Sections for O6+ Ion in Collisions with H2 Molecules
Authors: Gao J. W. , Qi Y. Y. , Wu Y. , Wang J. G. 
Published: February 2023

Abstract
Single- and double-electron capture (SEC and DEC) processes occurring in O6+ and H2 collisions are investigated in a wide-energy domain ranging from 0.1 to 100 keV u−1. Total and partial cross sections are calculated using a three-center, two-active-electron, semiclassical nonperturbative approach. To date, our close-coupling description of the collision is the most elaborate one in terms of accounting for electron correlation, molecular structures, and active channels. Our results are, in general, in good agreement with the available experimental ones for both total and partial cross sections. The comparison between the present calculations and available experimental data suggests that about 70% of the autoionization double capture may contribute to the measured SEC cross sections through postcollisional autoionization, while the stabilization of 30% of doubly excited states via the autotransfer to Rydberg states mechanism contributes to the measured DEC ones. Furthermore, we extend the understanding of the electron-capture processes on this system to impact energies above 20 keV u−1 for which no data exists. Our work provides new data for these electronic processes, which will be helpful for modeling astrophysical X-ray emissions induced by charge exchange.
A Multiwavelength Study of Active Galactic Nuclei in Post-merger Remnants
Authors: Li Wenhao , Nair Preethi , Irwin Jimmy , Ellison Sara , Satyapal Shobita , Drory Niv , Jones Amy , Keel William , Masters Karen , Stark David , Ryan Russell , Mukundan Kavya 
Published: February 2023

Abstract
We investigate the role of galaxy mergers in triggering active galactic nuclei (AGN) in the nearby universe. Our analysis is based on a sample of 79 post-merger remnant galaxies with deep X-ray observations from Chandra/XMM-Newton capable of detecting a low-luminosity AGN of ≥1040.5 erg s−1. This sample is derived from a visually classified, volume-limited sample of 807 post-mergers identified in the Sloan Digital Sky Survey Data Release 14 with log M
*/M
⊙ ≥ 10.5 and 0.02 ≤ z ≤ 0.06. We find that the X-ray AGN fraction in this sample is 55.7% ± 5.6% compared to 23.6% ± 2.8% for a mass- and redshift-matched noninteracting control sample. The multiwavelength AGN fraction (identified as an AGN in one of X-ray, IR, radio or optical diagnostics) for post-mergers is 76.6% ± 4.8% compared to 39.1% ± 3.2% for controls. Thus post-mergers exhibit a high overall AGN fraction with an excess between 2 and 4 depending on the AGN diagnostics used. In addition, we find most optical, IR, and radio AGN are also identified as X-ray AGN while a large fraction of X-ray AGN are not identified in any other diagnostic. This highlights the importance of deep X-ray imaging to identify AGN. We find that the X-ray AGN fraction of post-mergers is independent of the stellar mass above log M
*/M
⊙ ≥ 10.5 unlike the trend seen in control galaxies. Overall, our results show that post-merger galaxies are a good tracer of the merger–AGN connection and strongly support the theoretical expectations that mergers trigger AGN.
Tests of Loop Quantum Gravity from the Event Horizon Telescope Results of Sgr A*
Authors: Afrin Misba , Vagnozzi Sunny , Ghosh Sushant G. 
Published: February 2023

Abstract
The Event Horizon Telescope (EHT) collaboration’s image of the compact object at the Galactic center is the first direct evidence of the supermassive black hole (BH) Sgr A*. The shadow of Sgr A* has an angular diameter d
sh = 48.7 ± 7 μas with fractional deviation from the Schwarzschild BH shadow diameter

δ
=
−

0.08

−
0.09

+
0.09

,
−

0.04

−
0.10

+
0.09

(for the VLTI and Keck mass-to-distance ratios). Sgr A*'s shadow size is within 10% of Kerr predictions, equipping us with yet another tool to analyze gravity in the strong-field regime, including testing loop quantum gravity (LQG). We use Sgr A*'s shadow to constrain the metrics of two well-motivated LQG-inspired rotating BH (LIRBH) models characterized by an additional deviation parameter L

q
, which recover the Kerr spacetime in the absence of quantum effects (L

q
→ 0). When increasing the quantum effects through L

q
, the shadow size increases monotonically, while the shape gets more distorted, allowing us to constrain the fundamental parameter L

q
. We use the astrophysical observables shadow area A and oblateness D to estimate the BH parameters. It may be useful in extracting additional information about LIRBHs. While the EHT observational results completely rule out the wormhole region in LIRBH-2, a substantial parameter region of the generic BHs in both models agrees with the EHT results. We find that the upper bounds on L

q
obtained from the shadow of Sgr A*—L

q
≲ 0.0423 and L

q
≲ 0.0821 for the two LIRBHs, respectively—are more stringent than those obtained from the EHT image of M87*.
Analysis Methods to Localize and Characterize X-Ray Sources with the Microchannel X-Ray Telescope on Board the SVOM Satellite
Authors: Hussein Shaymaa , Robinet Florent , Boutelier Martin , Götz Diego , Gros Aleksandra , Schneider Benjamin 
Published: February 2023

Abstract
The Space-based multiband astronomical Variableonboard computing resources. This Object Monitor (SVOM) is a Sino–French space mission targeting high-energy transient astrophysical objects such as gamma-ray bursts. The soft X-ray part of the spectrum is covered by the Microchannel X-ray Telescope (MXT), which is a narrow field telescope designed to localize X-ray sources precisely. This paper presents the methods implemented on board to characterize and localize X-ray sources with the MXT. A specific localization method was developed to accommodate the optical system of the MXT, which is based on “Lobster Eye” grazing incidence micropore optics. For the first time, the algorithm takes advantage of cross-correlation techniques to achieve a localization accuracy down to 2′ with fewer than 200 photons, which guarantees rapid follow-up for most of the gamma-ray bursts that SVOM will observe. In this paper, we also study the limitations of the algorithm and characterize its performance.
Hunting for Neighboring Open Clusters with Gaia DR3: 101 New Open Clusters within 500 pc
Authors: Qin 秦 Songmei 松梅 , Zhong 钟 Jing 靖 , Tang 唐 Tong 通 , Chen 陈 Li 力 
Published: February 2023

Abstract
We systematically searched for open clusters in the solar neighborhood within 500 pc using the pyUPMASK and HDBSCAN clustering algorithms based on Gaia DR3. Taking into consideration that the physical size for most open clusters is less than 50 pc, we adopted a slicing approach for different distance shells and identified 324 neighboring open clusters, including 223 reported open clusters and 101 newly discovered open clusters, named here as the Open Cluster of Solar Neighborhood. Our discovery has increased the number of open clusters in the solar neighborhood by about 45%. In this work, larger spatial extents and more member stars were attained for our cluster sample. We provided the member stars and the membership probabilities through the pyUPMASK algorithm for each cluster and derived their astrophysical, age, and structural parameters.
SN 2019ewu: A Peculiar Supernova with Early Strong Carbon and Weak Oxygen Features from a New Sample of Young SN Ic Spectra
Authors: Williamson Marc , Vogl Christian , Modjaz Maryam , Kerzendorf Wolfgang , Singhal Jaladh , Boland Teresa , Burke Jamison , Chen Zhihao , Hiramatsu Daichi , Galbany Lluís , Gonzalez Estefania Padilla , Howell D. Andrew , Jha Saurabh W. , Kwok Lindsey A. , McCully Curtis , Newsome Megan , Pellegrino Craig , Rho Jeonghee , Terreran Giacomo , Wang Xiaofeng 
Published: February 2023

Abstract
With the advent of high-cadence, all-sky automated surveys, supernovae (SNe) are now discovered closer than ever to their dates of explosion. However, young premaximum light follow-up spectra of Type Ic SNe (SNe Ic), probably arising from the most-stripped massive stars, remain rare despite their importance. In this Letter, we present a set of 49 optical spectra observed with the Las Cumbres Observatory through the Global Supernova Project for 6 SNe Ic, including a total of 17 premaximum spectra, of which 8 are observed more than a week before V-band maximum light. This data set increases the total number of publicly available premaximum-light SN Ic spectra by 25%, and we provide publicly available SNID templates that will significantly aid in the fast identification of young SNe Ic in the future. We present a detailed analysis of these spectra, including Fe ii 5169 velocity measurements, O i 7774 line strengths, and continuum shapes. We compare our results to published samples of stripped SNe in the literature and find one SN in our sample that stands out. SN 2019ewu has a unique combination of features for an SN Ic: an extremely blue continuum, high absorption velocities, a P Cygni–shaped feature almost 2 weeks before maximum light that TARDIS radiative transfer modeling attributes to C ii rather than Hα, and weak or nonexistent O i 7774 absorption feature until maximum light.
Precise Empirical Determination of Metallicity Dependence of Near-infrared Period–Luminosity Relations for RR Lyrae Variables
Authors: Bhardwaj Anupam , Marconi Marcella , Rejkuba Marina , de Grijs Richard , Singh Harinder P. , Braga Vittorio F. , Kanbur Shashi , Ngeow Chow-Choong , Ripepi Vincenzo , Bono Giuseppe , De Somma Giulia , Dall’Ora Massimo 
Published: February 2023

Abstract
RR Lyrae variables are excellent Population II distance indicators thanks to their well-defined period–luminosity relations (PLRs) at infrared wavelengths. We present results of near-infrared (NIR) monitoring of Galactic globular clusters to empirically quantify the metallicity dependence of NIR PLRs for RR Lyrae variables. Our sample includes homogeneous, accurate, and precise photometric data for 964 RR Lyrae variables in 11 globular clusters covering a large metallicity range (Δ[Fe/H] ∼ 2 dex). We derive JHK

s
-band period–luminosity–metallicity (PLZ) and period–Wesenheit–metallicity (PWZ) relations anchored using 346 Milky Way field RR Lyrae stars with Gaia parallaxes, and simultaneously solved for independent distances to globular clusters. We find a significant metallicity dependence of ∼0.2 mag dex−1 in the JHK

s
-band PLZ and PWZ relations for RR Lyrae stars independent of the adopted metallicity scale. The metallicity coefficients and the zero-points of the empirical PLZ and PWZ relations are in excellent agreement with the predictions from the horizontal branch evolution and pulsation models. Furthermore, RR Lyrae–based distances to our sample of globular clusters are also statistically consistent with other independent measurements in the literature. Our recommended empirical JHK

s
-band PLZ relations for RR Lyrae stars with periods of fundamental mode pulsation (P
f) are:

M

J

=

−
0.44

(
±
0.03
)
−
1.83

(
±
0.02
)
log

(

P

f

)

+
0.20

(
±
0.02
)

[
Fe

/

H
]

(
σ
=
0.05

mag
)

M

H

=

−
0.74

(
±
0.02
)
−
2.29

(
±
0.02
)
log

(

P

f

)

+
0.19

(
±
0.01
)
[
Fe

/

H
]

(
σ
=
0.05

mag
)

M

K

s

=

−
0.80

(
±
0.02
)
−
2.37

(
±
0.02
)
log

(

P

f

)

+
0.18

(
±
0.01
)

[
Fe

/

H
]

(
σ
=
0.05

mag
)
.
«E ordinò di farne panni coi quali coprire le sue parti peccaminose»: alcuni appunti di lettura sulla Cantiga de Santa María del monaco blasfemo di Odemira (327)
Authors: Negri Manuel 
Published: February 2023

Tra le varie Cantigas de Santa Maria localizzate in Portogallo, la n. 327 costituisce ancora oggi un enigma quanto alle fonti che l’avrebbero potuta ispirare e ai motivi capaci di darle significato: si tratta della storia di un religioso punito per aver voluto ricavare delle mutande da una tovaglia d’altare. Questo contributo mira a orientare il lettore nella ricostruzione delle eredità culturali proprie dei motivi presenti nella Cantiga, sia attraverso un confronto con paralleli narrativi che potrebbero richiamare i punti salienti della vicenda, sia richiamando motivi e credenze legate all’uso delle tovaglie d’altare utili per dare un senso all’agire del protagonista.
Algunas consideraciones sobre las Cantigas de Santa María y la espiritualidad franciscana
Authors: Sota Juan 
Published: February 2023

En las últimas décadas se ha avanzado considerablemente en el estudio de las fuentes y métodos de trabajo del escritorio de Alfonso X. El proceso de creación de las Cantigas de Santa María coincidió con un período de gran expansión de las nuevas órdenes mendicantes en la península ibérica apoyadas por el monarca, siendo estas portadoras de toda una nueva visión de la espiritualidad cristiana. El presente estudio pretende analizar la presencia de las nuevas tendencias religiosas características del siglo xiii en esta obra del rey Sabio. Dada la fuerte influencia de la orden franciscana tanto en el ámbito intelectual castellano, como en el entorno cercano al monarca, nos centraremos en una posible lectura del proyecto general y algunas cantigas en particular en consonancia con la espiritualidad franciscana.