bluuebunny/crossref_metadata_2025_split huggingface dataset:
The progenitor of SN 2023ixf from hydrodynamical modeling
Authors: Bersten M. C. , Orellana M. , Folatelli G. , Martinez L. , Piccirilli M. P. , Regna T. , Román Aguilar L. M. , Ertini K. 
Published: January 2024

Context. The supernova (SN) 2023ixf is among the nearest Type II SNe discovered in recent decades. As such, there is a wealth of observational data of both the event itself and of the associated object identified in pre-explosion images. This has enabled variety of studies aimed at determining the SN properties and the nature of the putative progenitor star. Modeling the light curve is a powerful method to derive the physical properties independently of direct progenitor analyses.
Aims. We investigate the physical nature of SN 2023ixf based on a hydrodynamical modeling of its bolometric light curve and expansion velocities during the complete photospheric phase.
Methods. A grid of one dimensional (1D) explosions was calculated for evolved stars of different masses. We derived the properties of SN 2023ixf and its progenitor by comparing our models with the observations.
Results. The observations at t ≳ 20 days are aptly reproduced by the explosion of a star with zero-age main sequence mass of MZAMS = 12 M⊙, an explosion energy of 1.2 × 1051 erg, and a nickel mass of 0.05 M⊙. This indicates that SN 2023ixf was a normal event. Our modeling suggests a limit of MZAMS < 15 M⊙, thereby favouring the low-mass range among the results from pre-explosion observations.
Maser polarization through anisotropic pumping
Authors: Lankhaar Boy , Surcis Gabriele , Vlemmings Wouter , Impellizzeri Violette 
Published: January 2024

Context. Polarized emission from masers is an excellent tool to study magnetic fields in maser sources. The linear polarization of the majority of masers is understood as an interplay of maser saturation and anisotropic pumping. However, for the latter mechanism, no quantitative modeling has been presented yet.
Aims. We aim to construct a comprehensive model of maser polarization, including quantitative modeling of both anisotropic pumping and the effects of maser saturation on the polarization of masers.
Methods. We extended regular (isotropic) maser excitation modeling with a dimension that describes the molecular population alignments, as well as including the linear polarization dimension to the radiative transfer. The results of the excitation analysis yielded the anisotropic pumping and decay parameters, which were subsequently used in one-dimensional proper maser polarization radiative transfer modeling.
Results. We present the anisotropic pumping parameters for a variety of transitions from class I CH3OH masers, H2O masers, and SiO masers. SiO masers are highly anisotropically pumped due to them occurring in the vicinity of a late-type star, which irradiates the maser region with a strong directional radiation field. Class I CH3OH masers and H2O masers occur in association with shocks, and they are modestly anisotropically pumped due to the anisotropy of the excitation region.
Conclusions. Our modeling constitutes the first quantitative constraints on the anisotropic pumping of masers. We find that anisotropic pumping can explain the high polarization yields of SiO masers, as well as the modest polarization of unsaturated class I CH3OH masers. The common 22 GHz H2O maser has a relatively weak anisotropic pumping; in contrast, we predict that the 183 GHz H2O maser is strongly anisotropically pumped. Finally, we outline a mechanism through which non-Zeeman circular polarization is produced, when the magnetic field changes direction along the propagation through an anisotropically pumped maser.
Properties, age, and origin of a huge meteor cluster observed over Scandinavia on 30 October 2022
Authors: Koten P. , Čapek D. , Midtskogen S. , Shrbený L. , Spurný P. , Hankey M. 
Published: January 2024

Context. A meteor outburst consisting of at least 22 meteors above the Baltic sea and southern Scandinavia that occurred on 30 October 2022 was recorded using multiple cameras. A bright fireball was followed by fainter meteors over a 10 second period. All the meteors were travelling on parallel trajectories.
Aims. The goal of this study is to determine the atmospheric trajectories and photometric masses of meteors and to use these data to determine the specifics of the progenitor meteoroid break-up and cluster formation.
Methods. Double and triple-station observations using video cameras were used for the calculation of the atmospheric trajectories and photometric masses of the meteors. Their relative positions and mass distribution were then used to determine the time and cause of the meteoroid fragmentation.
Results. The relative position of the cluster particles in the atmosphere and the distribution of their masses best correspond to the separation of the smaller fragments from the mass-dominant fragment 10.6 ± 1.7 days before the collision with Earth, assuming a meteoroid bulk density of 1000 kg m−3. The ejection velocities are in the range 0.16–0.61 ms−1. The directions of the ejection velocities are bounded by a cone with an apex angle of 43°. The axis of this cone has ecliptic coordinates of l = 154° and b = 26° and is 66° away from the direction to the Sun. Thermal stresses appear to be the most likely cause of such meteor cluster formation.
Anticiper la pandémie de grippe aviaire
Authors: Hayes Brandon 
Published: January 2024

La modélisation mathématique en épidémiologie comprend un ensemble d’outils capable de fournir des informations mesurables basées sur des données historiques ou en temps réel. Différents modèles sont utilisables et peuvent être grossièrement répartis en deux catégories : les modèles statistiques et les modèles mécanistes. La modélisation est un outil majeur pour aider les décideurs politiques dans le domaine de la santé publique. Dans le cas de l’influenza aviaire hautement pathogène, elle permet notamment de prédire les dynamiques d’évolution des épizooties et l’impact des différentes mesures, comme la réduction de la densité des élevages ou la mise en place de la vaccination des oiseaux.
Zwischen den Jahren
Authors: Timmann Doris , Zohmann Andreas 
Published: January 2024

Liebe Leserinnen und Leser,die Zeit „zwischen den Jahren" hat für viele von uns eine
einzigartige Bedeutung. Es ist eine Zeit, um innezuhalten und zu reflektieren,
während man gleichzeitig gespannt in die Zukunft blickt. Unterdessen schafft
sie auch Bewusstsein für das Gegenwärtige. Es ist eine Zeit in der
man sich besonders mit seinen Tieren verbunden fühlen kann – sei es
bei Spaziergängen oder während gemütlicher Stunden zu Hause.
Für viele ist es zudem – zwischen Glühweinduft und guten
Vorsätzen – die perfekte Zeit, um Wissen zu vertiefen und zu
erweitern.
Evaluating information asymmetry effects on hotel pricing: a comparative analysis before and during the COVID-19 pandemic in the Taiwan’s market
Authors: Wang Meng-Ying , Chou Li-Chen 
Published: January 2024

AbstractThe outbreak of the COVID-19 pandemic has imposed substantial impacts on the global hotel industry. This study employed a two-tier stochastic frontier model to investigate the dynamics of transaction information distribution within the tourist hotel lodging prices in Taiwan from July 2019 to November 2020. The primary objective was to analyze the disparities in price information between consumers and hoteliers before and after the outbreak of COVID-19. Empirical findings reveal a notable reduction in the divergence of lodging price information between consumers and hoteliers post the COVID-19 outbreak, particularly in metropolitan areas. The shift in consumer group structures within hotel operations induced by the pandemic has, in turn, exerted an influence on the pricing strategies adopted by hoteliers. The empirical results underscore that the outbreak of COVID-19 has contributed to a more transparent and comprehensive market price information environment, consequently diminishing the asymmetry in information between hoteliers and consumers.
Electronic spectra of jet-cooled 1,4-bis(phenylethynyl)benzene: Strength in π-electron conjugation and two large-amplitude torsional motions
Authors: Suzuki Ryoko , Chiba Kohei , Tanaka Sei’ichi , Okuyama Katsuhiko 
Published: January 2024

To spectroscopically qualify strength in the π-electron conjugation, the electronic spectra of jet-cooled 1,4-bis(phenylethynyl)benzene (BPEB) in the region of the transition to the lowest excited singlet (S1) 1B1u state are measured by the fluorescence excitation and the single-vibronic-level dispersed fluorescence methods. Strength is defined as the difference in potential energies between the planar and perpendicular conformations. BPEB possesses two large-amplitude torsional motions, out-of-phase 24 and in-phase 29 modes. The most stable is the planar conformation, and barrier heights at the perpendicular conformation are coincident in torsional potentials for the two modes. Torsional levels are successively observed up to 19± and 16− quantum levels in the ground state, respectively. Strength is determined to be 293 cm−1 (3.51 kJmol−1) with an accuracy of an error range smaller than 1 cm−1. In the excited state, strength is estimated to be 1549 ± 73 cm−1. Combination levels of two torsional modes are also measured up to high quantum levels. A systematic decrease in frequencies is observed with increasing the quantum number. Quantum-chemistry calculations of B3LYP, CAM-B3PLYP, WB97XD, and M062X with basis sets of aug-cc-pVDZ are performed, where B3LYP theories are carried out with the dispersion correlation. The calculated strength is 1.1–2.1 times larger than observed.
Evaluation of a membrane filter and platelet-rich plasma (PRP) product obtained from a prototype PRP kit that works through a new method for separating PRP based on cell dimensions
Authors: Jakfar Subhaini , Ningsih Diana Setya , Lin Tzu-Chieh , Chen Zhi-Yu , Lin Feng-Huei , Gani Basri A. , Syafriza Dharli , Kusuma Hendra 
Published: January 2024

The harvesting of platelet-rich plasma (PRP) from whole blood based on cell density is a standard procedure that is currently applied to commercially available PRP kits. Leukocytes and erythrocytes, which are closer in density, contaminate a significant amount of PRP products, mostly commercial PRP kits. In this study, we tested membrane filters and PRP products from our prototype PRP kit. We did this by putting a membrane filter with pores of 2 μm in the middle of the tube, which is a new way to separate things based on the cell dimension method (CDM). The evaluations were performed for membrane filter use, hematology analysis, blood smears, viability and cytotoxicity assays, and fibrin structure by scanning electron microscopy (SEM). Compared to the density method (DM), the CDM enables the elimination of a significant number of leukocytes and erythrocytes from the PRPs (CDM-PRP) and a significant increase in the number of platelets compared to the whole blood and DM-PRP. Furthermore, both DM-PRP and CDM-PRP increased the cell viability in L929 cells by adding them at 5% in the culture medium. In addition to CDM-PRP having the lowest cytotoxicity based on the LDH assay, the fibrin structure of CDM-PRP blood clots is characterized by thickness and firmness with a network structure. Thus, we believe that the PRP from the prototype PRP kit meets the requirements as a biomaterial for medical treatments.
Conformational preference of 2-(4-methoxyphenyl)ethanol studied by supersonic jet spectroscopy: Intramolecular OH/π interaction
Authors: Nagasawa Hironari , Ogawa Sakuya , Kashihara Wataru , Isozaki Tasuku , Hirata Keisuke , Ishiuchi Shun-ichi , Fujii Masaaki , Suzuki Tadashi 
Published: January 2024

A π-type hydrogen bonding between the OH group and the π electron is a crucial factor for the conformational preference of the molecular structure with a flexible group. However, the information on the effect of the substituent on the OH/π interaction is insufficient. The laser-induced fluorescence (LIF) excitation, the dispersed fluorescence (DF), the IR–UV hole-burning, and the IR dip spectra of jet-cooled 2-(4-methoxyphenyl)ethanol were measured for the first time. Almost all bands observed in the spectral region of 35 550–36 500 cm−1 in the LIF excitation spectrum were successfully assigned with the DF and the IR–UV hole-burning spectra coupled with the quantum chemical calculation at M06-2x/6-311G and MP2/6-311G levels. Five conformers were found in the LIF excitation spectrum. The most stable conformer was Ggπ, and the second most stable conformer was Ggπ′ (the trans rotamer of the methoxy group for Ggπ). Ggπ and Ggπ′ had the OH group directed toward the π electron system of the benzene ring. The OH stretching frequency of Ggπ/Ggπ′ of MPE in the IR dip spectra was red-shifted against that of Ggπ of phenylethanol, indicating that the introduction of the methoxy group would enhance the intramolecular OH/π interaction. In addition, the torsional vibration between the benzene ring and the side chain (−CH2CH2OH) (mode 63) was observed in the DF spectra of the Ggπ–00 and Ggπ′–00 band excitation, but their intensities were rather different, resulting from the different orientation of the OH group for each conformer toward the π electron system. The methoxy group would increase the negative charge on the benzene ring and would enhance the intramolecular OH/π interaction through the electrostatic interaction.
A Swedish merger
Authors: Wenner Lena 
Published: January 2024

Abstract
In Sweden, an ongoing sound change is resulting in the pronunciation of short /œ/ and short /ɵ/ becoming more
similar. This chapter examines the relationship between the two sounds in the region of Uppland, situated in Central Sweden.
It summarises the results of three tests conducted to investigate the informants’ production and perception of this sound
change as well as their attitudes towards it. By combining the results of the production test with the informants’
categorisations in the perception test, the original study showed that those informants with a small phonetic distance between
/œ/ and /ɵ/ in their own speech were better at categorising vowel stimuli correctly than the speakers who had a larger
phonetic distance.
Coronalisation in the German multi-ethnolect
Authors: Auer Peter , Duran Daniel 
Published: January 2024

Abstract
We investigate coronalisation, i.e. the fronting of the palatal fricative /ç/, in the multi-ethnolect spoken by
young people in the city of Stuttgart. In contrast to a previous study on the Berlin multi-ethnolect, which claims a merger of
/ç/ with /ʃ/, we only find a weak and unstable tendency among our speakers to reduce the difference between the two dorsal
fricatives /ç/ and /ʃ/, as compared to a group of similar speakers living in a relatively monoethnic neighbourhood. Depending
on the phonetic measurements used, this tendency mostly remains below the threshold of significance. We discuss two
interpretations of these findings, one linked to the ambient German dialects, the other postulating the beginning of regional
differentiation between the German multi-ethnolects.
Towards quantum mechanics on the curved cotangent bundle
Authors: Wagner Fabian 
Published: January 2024

AbstractThe minimal-length paradigm is a cornerstone of quantum gravity phenomenology. Recently, it has been demonstrated that minimal-length quantum mechanics can alternatively be described as an undeformed theory set on a nontrivial momentum space. However, there is no fully consistent formulation of these theories beyond Cartesian coordinates in flat space and, in particular, no position representation. This paper is intended to take the first steps in bridging this gap. We find a natural position representation of the position and momentum operators on general curved cotangent bundles. In an expansion akin to Riemann normal coordinates with curvature in both position and momentum space, we apply the formalism perturbatively to the isotropic harmonic oscillator and the hydrogenic atom. Due to the symmetry of the harmonic oscillator under exchange of positions and momenta, we show that it is impossible to distinguish position- from momentum-space curvature with oscillators alone. Thus, we obtain an instantiation of Born reciprocity on the curved cotangent bundle, i.e. in precisely the way Born originally envisioned. It manifests itself as a symmetry mixing UV and IR physics, reminiscent of T-duality in string theory.
A novel approach for bearings multiclass fault diagnosis fusing multiscale deep convolution and hybrid attention networks
Authors: Li Fule , Zhao Xinlong 
Published: January 2024

Abstract
Insufficient and imbalanced samples pose a significant challenge in bearing fault diagnosis, leading to low diagnosis accuracy. However, the fault characteristics of vibration signals are weak and difficult to extract when faults occur in the early stage. This paper proposes an effective fault diagnosis method that addresses small and imbalanced sample problems under noise interference. First, the number of faulty samples in the form of 1D signals is increased mainly by the sliding split sampling method. The preprocessed data are used to create 2D time–frequency diagrams using the continuous wavelet transform (CWT), which can extract effective features to improve the data quality. Subsequently, the minority samples are oversampled by combining synthetic minority oversampling technique to realize time–frequency conversion augmented oversampling. Moreover, the clustering method and random undersampling method are introduced to prevent the overfitting and underfitting problems respectively. Then, we propose a hybrid attention mechanism to enhance the extraction of effective feature information. This combination, integrating CWT with a multicolumn modified deep residual network, effectively extracts fault characteristics and suppresses noise effects. The experimental results demonstrate the effectiveness of the proposed method by comparison with other advanced methods using two case studies of bearing datasets.
A two-region model for azimuthal striations in an inductively coupled plasma
Authors: Gu Meng-Zhi , Lei Zhi-Cheng , Pu Yi-Kang 
Published: January 2024

Abstract
A two-region discharge model with a perturbation analysis was developed for the azimuthal striations observed in an inductively coupled plasma with an immersed cylindrical coil at pressures of 75–1500 mTorr. This model partitions the discharge area into two distinct regions: a bright region near the coil with intense excitation and ionization processes, and a darker region extending from the boundary of the bright core to the chamber wall. This partition reflects the experimental observation that striations are restricted to the vicinity of the coil and this phenomenon becomes more pronounced with increasing pressure. Through a perturbation analysis, the model indicates that the azimuthal striations manifest only below a critical power threshold, and this threshold decreases with pressure, which aligns with the experimental observations. Additionally, the model-predicted number of striations is in good agreement with the experiment over a wide pressure range.
Impact of CdSeTe and CdSe film deposition parameter on the properties of CdSeTe/CdTe absorber structure for solar cell applications
Authors: Çiriş Ali , Atasoy Yavuz , Tomakin Murat , Karaca Abdullah , Küçükömeroğlu Tayfur , Bacaksız Emin 
Published: January 2024

Abstract
In this study, the effect of depositing CdSeTe and CdTe layers at different substrate temperatures (STs) by evaporation in vacuum on the properties of the CdSeTe/CdTe stacks was investigated. First, CdSeTe layers in stack structure were grown at STs of 150 °C, 200 °C and 250 °C and then CdTe layers on the CdSeTe produced with the optimum temperature were coated at STs of 150 °C, 200 °C and 250 °C. The employing of STs up to 150 °C on both CdSeTe and CdTe films in CdSeTe/CdTe stacks demonstrated the presence of Te and/or oxide phases as well as the alloying, while more stable phase structures at higher temperatures. In the CdSeTe/CdTe stack, the increase in ST of CdSeTe promoted the alloying, while it weakened the alloy in which was applied in CdTe. It was concluded that under the applied experimental conditions, STs of 250 °C and 200 °C with the graded alloying structure, suitable absorption sites, more homogeneous surface morphology for potential solar cell applications would be more suitable for CdSeTe and CdTe, respectively. As a result, the application of ST to CdSeTe or CdTe in the stacks can be used as a tool to control the properties of the stack structure.
A magnetically controlled microstructured surface for three-dimensional droplet manipulation
Authors: Qin Hao , Peng Xianyu , Ji Jiaxin , Li Jing 
Published: January 2024

Abstract
The smart manipulation of droplets has received widespread attention due to its potential applications in many fields. However, it is still challenging to realize robust multidimensional, versatile liquid manipulation using magnetically responsive surfaces. Here, a magnetically controlled surface with a dense array of cone-shaped microstructures is developed by the spray self-assembly method using soft nontoxic materials. The effects of the spray volume and material concentrations on the surface morphology and wettability are systematically investigated. The wettability and adhesion properties of the developed surface can be reversibly switched in the presence of an on/off magnetic field. In situ observation indicated that the driving force acted on the droplet is derived from localized deformation of the microstructures. Moreover, theoretical models of droplet manipulation are proposed to demonstrate the underlying mechanism. Under the actuation of the moving magnetic field, the surface can transport droplets of 1–14 μl in the vertical direction, and the modified superhydrophobic surface can transport droplets of 3–30 μl in the horizontal direction and achieve against-gravity droplet climbing with a volume of 10 μl at a climbing angle of 25°. The environmentally friendly and facilely manufacturable surface presents promising applications in liquid microreactors and the transportation of mixed fluids in biological and chemical research.
An adjustable magnetic type resonant multimodal inertial impact motor
Authors: He Liangguo , Qian An , Li Xinyu , Dong Yuge , Yue Xukang , Wan Zhikai 
Published: January 2024

Abstract
The conventional asymmetric inertial impact motors are driven by using the difference in inertial impact forces in the forward and reverse directions, implemented by using asymmetric drive signals, clamping blocks of different sizes or different materials, etc. An adjustable magnetic force type resonant inertia impact motor has been designed, assembled, and tested. The novel motor features a simple and compact structure, allowing for the attainment of different output performance by adjusting the magnetic force to meet various working requirements, and the reverse motion can be easily achieved by simply altering the orientation of the magnet located at the end of the piezoelectric vibrator, without requiring any additional structure The part of the motor’s structure was simulated and optimized using the finite element analysis software COMSOL6.0, with the first and second order vibration modes selected as the working mode. The experimental platform has been established to verify the working performance of the motor. Experimental results demonstrate that, under excitation voltage of 120 VP–P and frequency of 163 Hz, the maximum speed achieved by the motor prototype is 36.55 mm s−1, with maximum load capacity of 320 g, and under excitation voltage of 40 VP–P and frequency of 928 Hz, the minimum step of the prototype reaching up to 134 nm. The motor proposed in this paper features an innovative asymmetric strong magnetic design, enabling high speed and load through the large amplitude of the piezoelectric vibrator in first-order vibration mode. As the amplitude gradually decreases in second and higher order modes, this motor achieves higher displacement resolution, making it has potential applications in high precision positioning and medical fields.