bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modification of the Shower Database of the IAU Meteor Data Center
Authors: Hajduková M. , Rudawska R. , Jopek T. J. , Koseki M. , Kokhirova G. , Neslušan L. 
Published: February 2023

Context. The Shower Database (SD) of the Meteor Data Center (MDC) has been operating for 15 yr and is used by the entire community of meteor astronomers. It contains meteor showers categorised in individual lists on the basis of their status. Since the inception of the SD, no objective rules for moving showers between individual lists have been established. The content of the SD has not yet been checked for the correctness of the meteor data contained therein.
Aims. Our aims are (1) to formulate criteria for nominating meteor showers for established status, (2) to improve the rules for the removal of showers, (3) to verify and enhance the content of the SD, and (4) to improve the user area of the MDC SD.
Methods. The criteria for moving showers from the Working list to the Lists of established or removed showers were generated using an empirical evaluation of their impact on the registered showers. The correctness of the parameters of each stream included in the SD was checked by comparing them with the values given in the source publications.
Results. We developed a set of criteria for nominating showers to be established. We objectified rules for the temporary and permanent removal of meteor showers from the Working list. Both of our proposed new procedures were approved by a vote of the commission F1 of the IAU in July 2022. We verified more than 1350 data records of the MDC SD and introduced ~1700 corrections. We included new parameters for shower characterisation. As a result of our verification procedure, 117 showers have been moved to the List of removed showers. As of October 2022, the SD contains 923 showers, 110 of which are in the List of established showers and 813 are in the Working list. We also improved the user area of the SD and added a simple tool to allow a quick check of the similarity of a new shower to those in the database.
Lyman continuum leaker candidates among highly ionised, low-redshift dwarf galaxies selected from He II
Authors: Enders A. U. , Bomans D. J. , Wittje A. 
Published: February 2023

Context. Contemporary research suggests that the reionisation of the intergalactic medium (IGM) in the early Universe was predominantly realised by star-forming (proto-)galaxies (SFGs). Due to observational constraints, our knowledge on the origins of sufficient amounts of ionising Lyman continuum (LyC) photons and the mechanisms facilitating their transport into the IGM remains sparse. Recent efforts have thus focussed on the study of local analogues to these high-redshift objects.
Aims. We aim to acquire a set of very low-redshift SFGs that exhibit signs of a hard radiation field being present. A subsequent analysis of their emission line properties is intended to shed light on how the conditions prevalent in these objects compare to those predicted to be present in early SFGs that are thought to be LyC emitters (LCEs).
Methods. We used archival spectroscopic SDSS DR12 data to select a sample of low-redshift He II 4686 emitters and restricted it to a set of SFGs with an emission line diagnostic sensitive to the presence of an active galactic nucleus, which serves as our only selection criterion. We performed a population spectral synthesis with FADO to reconstruct these galaxies’ star-formation histories (SFHs). Utilising the spectroscopic information at hand, we constrained the predominant ionisation mechanisms in these galaxies and inferred information on interstellar medium (ISM) conditions relevant for the escape of LyC radiation.
Results. Our final sample consists of eighteen ionised, metal-poor galaxies (IMPs). These low-mass (6.2 ≤ log(M⋆/M⊙) ≤ 8.8), low-metallicity (7.54 ≤ log(O/H) + 12 ≤ 8.13) dwarf galaxies appear to be predominantly ionised by stellar sources. We find large [OIII] 5007/[OII] 3727 ratios and [SII] 6717,6731/Hα deficiencies, which provide strong indications for these galaxies to be LCEs. At least 40% of these objects are candidates for featuring cosmologically significant LyC escape fractions ≳10%. The IMPs’ SFHs exhibit strong similarities and almost all galaxies appear to contain an old (> 1 Gyr) stellar component, while also harbouring a young, two-stage (∼10 Myr and < 1 Myr) starburst, which we speculate might be related to LyC escape.
Conclusions. The properties of the compact emission line galaxies presented here align well with those observed in many local LCEs. In fact, our sample may prove as an extension to the rather small catalogue of local LCEs, as the extreme ISM conditions we find are assumed to facilitate LyC leakage. Notably, all of our eighteen candidates are significantly closer (z < 0.1) than most established LCEs. If the inferred LyC photon loss is genuine, this demonstrates that selecting SFGs from He II 4686 is a powerful selection criterion in the search for LCEs.
The LOFAR LBA Sky Survey
Authors: de Gasperin F. , Edler H. W. , Williams W. L. , Callingham J. R. , Asabere B. , Brüggen M. , Brunetti G. , Dijkema T. J. , Hardcastle M. J. , Iacobelli M. , Offringa A. , Norden M. J. , Röttgering H. J. A. , Shimwell T. , van Weeren R. J. , Tasse C. , Bomans D. J. , Bonafede A. , Botteon A. , Cassano R. , Chyży K. T. , Cuciti V. , Emig K. L. , Kadler M. , Miley G. , Mingo B. , Oei M. S. S. L. , Prandoni I. , Schwarz D. J. , Zarka P. 
Published: February 2023

Context. The Low Frequency Array (LOFAR) is the only existing radio interferometer able to observe at ultra-low frequencies (<100 MHz) with high resolution (<15") and high sensitivity (<1 mJy beam−1). To exploit these capabilities, the LOFAR Surveys Key Science Project is using the LOFAR Low Band Antenna (LBA) to carry out a sensitive wide-area survey at 41–66 MHz named the LOFAR LBA Sky Survey (LoLSS).
Aims. LoLSS is covering the whole northern sky above declination 24° with a resolution of 15" and a sensitivity of 1–2 mJy beam−1 (1σ) depending on declination, field properties, and observing conditions. Here we present the first data release, including a discussion of the calibration strategy and the properties of the released images and catalogues.
Methods. A fully automated pipeline was used to reduce the 95 fields included in this data release. The data reduction procedures developed for this project have a general application and are currently being used to process almost all LOFAR LBA interferometric observations. Compared to the preliminary release, direction-dependent errors have been derived and corrected for during the calibration process. This results in a typical sensitivity of 1.55 mJy beam−1, which is four times better than for the preliminary release, at the target resolution of 15".
Results. The first data release of the LOFAR LBA Sky Survey covers 650 deg2 in the HETDEX spring field. The resultant data products released to the community include mosaic images (I and V Stokes) of the region, and a catalogue of 42 463 detected sources and related Gaussian components used to describe the sources' morphologies. Separate catalogues for the six in-band frequencies of 44, 48, 52, 56, 60, and 64 MHz are also released.
Conclusions. The first data release of LoLSS shows that, despite the influences of the ionosphere and radio frequency interference, LOFAR can conduct large-scale surveys in the frequency window 42-66 MHz with unprecedentedly high sensitivity and resolution. The data can be used to derive unique information on the low-frequency spectral properties of many thousands of sources with a wide range of applications in extragalactic and galactic astronomy.
Approches moléculaires et thérapeutiques des interactions entre l’ocytocine et son récepteur
Authors: Hibert Marcel 
Published: February 2023

L’ocytocine est une neurohormone connue à l’origine pour son rôle dans les contractions de l’utérus au moment de l’accouchement et les contractions des glandes mammaires pour permettre l’éjection du lait lors de la tétée. Depuis les 25 dernières années, de multiples autres effets centraux et périphériques ont été identifiés, notamment dans les processus d’attachement entre parents et enfant, entre adultes et entre un individu et son groupe social. Nous avons abordé au cours de cette période la question fondamentale de l’architecture structurale et fonctionnelle du complexe formé par l’ocytocine et son récepteur et l’application de ce savoir à la conception de candidats médicaments. Ceci a conduit à la découverte du premier agoniste non peptidique de l’ocytocine, le LIT-001, restaurant l’interaction sociale dans un modèle animal d’autisme.
L’ocytocine, dès la naissance, conditionne le comportement alimentaire et social d’un individu
Authors: Muscatelli Françoise 
Published: February 2023

L’ocytocine (OT) est une neurohormone qui, dans le cerveau, régule ce que l’on appelle le « cerveau social » et dont l’étude est principalement conduite chez l’adulte. Au cours du développement postnatal, les mécanismes par lesquels le système OT structure divers comportements sont peu explorés. Nous présentons ici le processus dynamique du développement postnatal du système OT ainsi que ses rôles fonctionnels, en période périnatale, qui sont essentiels pour façonner les comportements sociaux. Nous abordons spécifiquement le rôle de l’OT chez le nouveau-né, qui permet d’intégrer et d’adapter des réponses aux premières stimulations sensorielles et qui stimule aussi l’activité de succion. Ce dialogue sensoriel et la tétée sont impliqués dans les liens mère-enfant et structurent les futures interactions sociales. Chez les rongeurs et chez l’homme, des maladies neuro-développementales avec des troubles du spectre autistique, comme les syndromes de Prader-Willi et de Schaaf-Yang, sont associées à des déficiences sensorielles, alimentaires et comportementales dans la petite enfance. Nous proposons qu’au début de la vie postnatale, l’OT joue un rôle clé dans la maturation des réseaux neuronaux contrôlant le comportement alimentaire et les premières interactions sociales. Une administration d’OT chez le nouveau-né améliore l’intégration sensorielle des facteurs environnementaux et la relation avec la mère ainsi que l’activité de succion comme nous l’avons montré chez des modèles de souris ainsi que chez des bébés atteints du syndrome de Prader-Willi. Des effets à long terme ont aussi été observés sur le comportement social et cognitif. Par conséquent, les difficultés précoces d’alimentation peuvent être un marqueur prédictif précoce des cas de troubles du spectre autistique (TSA) et l’administration exogène d’OT pourrait améliorer le comportement alimentaire et, à plus long terme, les troubles du comportement social.
Who is afraid of emergency politics? Public opinion on European crisis management during Covid-19
Authors: Ganderson Joseph , Schelkle Waltraud , Truchlewski Zbigniew 
Published: February 2023

AbstractAfter a decade of crisis management, the democratic implications of emergency modes of governance in the European Union (EU) are under the spotlight. The prevailing analysis is critical. Scholars point to an emergent, distinctly European trend of transnational crisis exploitation where elite appeals to exceptional pressures serve asymmetric power and influence, overriding democratic norms and potentially fuelling Eurosceptic backlash. However, the literature does not ask whether citizens consider themselves disempowered by the EU’s emergency politics, with its alleged emphasis on urgency and technocratic problem-solving. The relative symmetry and simultaneity of the Covid-19 crisis across Europe offers an opportunity for an empirical examination of public opinion on traits of emergency politics. We juxtapose the implications of emergency politics for public opinion with the transnational cleavages literature and use survey data from 15 member states on EU- and national-level pandemic responses to examine the competing hypotheses. Our findings indicate perceptions of crisis management are largely determined by prior views on EU integration and democracy. More generally, the results suggest that the transnational cleavage remains overall a key driver and delimiter of Euroscepticism in crisis times. Though there is some variance between emergency politics dimensions, we do not detect a widespread perception of disillusionment motivated by EU emergency rule.
The dual effect of digital communication reinforcement drivers on purchase intention in the social commerce environment
Authors: Selem Kareem M. , Shoukat Muhammad Haroon , Shah Syed Asim , de Brito Silva Marianny Jessica 
Published: February 2023

AbstractThe paper draws on the theory of planned behavior (TPB) to investigate the dual effect of digital communication reinforcement drivers: positive (i.e., interactivity, argument quality, hedonic motivation, and perceived enjoyment online) and negative (i.e., intrusive concerns and privacy concerns) on purchase intention. This paper also examines the mediation effect of perceived usefulness and the moderation effect of habit. Using a time-lag approach, 490 responses were collected from Pakistan’s social media users and then analyzed using SmartPLS v.3.2.8. Findings showed that interactivity, argument quality, and privacy concerns significantly affected purchase intention. Furthermore, perceived usefulness was partially mediated, and habit was discovered to be a significant moderator in liking perceived usefulness with enjoyment online and purchase intention. This paper advances TPB understanding and develops an integrated model for businesses to better understand customer physiology on social commerce platforms through effective contributions in theory and practice.
Dendrimer nanosystems for adaptive tumor-assisted drug delivery via extracellular vesicle hijacking
Authors: Jiang Yifan , Lyu Zhenbin , Ralahy Brigino , Liu Juan , Roussel Tom , Ding Ling , Tang Jingjie , Kosta Artemis , Giorgio Suzanne , Tomasini Richard , Liang Xing-Jie , Dusetti Nelson , Iovanna Juan , Peng Ling 
Published: February 2023

Drug delivery systems (DDSs) that can overcome tumor heterogeneity and achieve deep tumor penetration are challenging to develop yet in high demand for cancer treatment. We report here a DDS based on self-assembling dendrimer nanomicelles for effective and deep tumor penetration via in situ tumor-secreted extracellular vesicles (EVs), an endogenous transport system that evolves with tumor microenvironment. Upon arrival at a tumor, these dendrimer nanomicelles had their payload repackaged by the cells into EVs, which were further transported and internalized by other cells for delivery “in relay.” Using pancreatic and colorectal cancer-derived 2D, 3D, and xenograft models, we demonstrated that the in situ-generated EVs mediated intercellular delivery, propagating cargo from cell to cell and deep within the tumor. Our study provides a new perspective on exploiting the intrinsic features of tumors alongside dendrimer supramolecular chemistry to develop smart and effective DDSs to overcome tumor heterogeneity and their evolutive nature thereby improving cancer therapy.
Quantitative analysis of sterol-modulated monomer–dimer equilibrium of the β
1
-adrenergic receptor by DEER spectroscopy
Authors: Kubatova Nina , Schmidt Thomas , Schwieters Charles D. , Clore G. Marius 
Published: February 2023

G protein-coupled receptors (GPCR) activate numerous intracellular signaling pathways. The oligomerization properties of GPCRs, and hence their cellular functions, may be modulated by various components within the cell membrane (such as the presence of cholesterol). Modulation may occur directly via specific interaction with the GPCR or indirectly by affecting the physical properties of the membrane. Here, we use pulsed Q-band double electron–electron resonance (DEER) spectroscopy to probe distances between R1 nitroxide spin labels attached to Cys163 and Cys344 of the β
1
-adrenergic receptor (β
1
AR) in
n
-dodecyl-β-D-maltoside micelles upon titration with two soluble cholesterol analogs, cholesteryl hemisuccinate (CHS) and sodium cholate. The former, like cholesterol, inserts itself into the lipid membrane, parallel to the phospholipid chains; the latter is aligned parallel to the surface of membranes. Global quantitative analysis of DEER echo curves upon titration of spin-labeled β
1
AR with CHS and sodium cholate reveal the following: CHS binds specifically to the β
1
AR monomer at a site close to the Cys163-R1 spin label with an equilibrium dissociation constant

K

D

CHS

~1.4 ± 0.4 mM. While no direct binding of sodium cholate to the β
1
AR receptor was observed by DEER, sodium cholate induces specific β
1
AR dimerization (

K

D

cholate

~35 ± 6 mM and a Hill coefficient
n
~ 2.5 ± 0.4) with intersubunit contacts between transmembrane helices 1 and 2 and helix 8. Analysis of the DEER data obtained upon the addition of CHS to the β
1
AR dimer in the presence of excess cholate results in dimer dissociation with species occupancies as predicted from the individual
K
D
values.
Experimental analysis of a low controlling voltage tri-electrode MEMS electrostatic actuator for array applications
Authors: Allameh Mehdi , Zhou Yu , Chen Tao , Chrusch Dwayne , Park Byoungyoul , Shafai Cyrus 
Published: February 2023

Abstract
A tri-electrode electrostatic actuator with one moving microelectromechanical systems (MEMS) electrode and two stationary electrodes (tri-electrode actuator topology) is experimentally tested in this article. The stationary controlling (intermediate) electrode is perforated and below the moving MEMS electrode, and the common electrode is further below. Numerical simulations were performed to discover the most optimum tri-electrode design parameters to enable the best performance improvement compared to a conventional two electrode electrostatic actuator. A silicon-based moving MEMS electrode was designed with a relatively linear spring constant, and the controlling intermediate and primary stationary electrodes were fabricated on either side of a quartz substrate instead of free space to simplify their fabrication. The measurement results showed that the tri-electrode topology can control the displacement of the MEMS with a lower controlling voltage and with extended controllable range before pull-in instability, compared to the conventional actuator. Simulations and measurements showed the controlling voltage was decreased by 2.6 times smaller than the conventional actuator topology using a bipolar driven intermediate electrode, and the controllable deflection range before pull-in was elevated by 33%. This tri-electrode topology offers benefits for applications in need of arrays of electrostatic actuators such as deformable mirrors.
Development of an EGFET microsensor with 3D structure for high-specificity cardiac troponin I detection
Authors: Hsieh Chia-Hsu , Huang Chih-Hsien , Lin Jia-Huei , Yu Ling-Shan , Huang I-Yu 
Published: February 2023

Abstract
In this study, we used microelectromechanical systems (MEMS) technology to design a three-dimensional microsensor, which is based on an extended gate field-effect transistor (EGFET), to detect cardiac troponin (cTnI). A planar micro-reference electrode was integrated onto the same chip. All fabrication processes were compatible with integrated circuit and MEMS technologies, and the dimension of our cTnI microsensor was 1.0 cm × 0.8 cm. From measurements, microsensor sensitivity was 11.408 V (ng ml−1)−1 and sensing linearity was 0.961 in the 0–0.05 ng ml−1 range. In the 0.05–1 ng ml−1 range, sensitivity was 0.887 V (ng ml−1)−1 and linearity 0.933. The detection limit was 0.0063 ng ml−1, and the response time was approximately 300 s. Bridge-type source read-out, temperature correction and temperature compensation circuits were also successfully designed and were used to reduce the influence of temperature on sensing signals.
Hadronic loop effects to excited scalar charmed mesons revisited
Authors: Alhakami Mohammad H , Althubiti Numa A , Al-shammari Nwuyer A 
Published: February 2023

Abstract
We re-examine the hadronic loop effects on the masses of

D

0

*

and

D

s
0

*

calculated in quark models in the framework of heavy meson chiral perturbation theory (HMCHPT). Unlike previous approaches, ours reproduces the observed scalar charm states reported by the Particle Data Group (PDG). We show why previous approaches of using HMCHPT in studying mass shift effects due to chiral loops gave unsatisfactory results.
Ab initio no-core shell-model study of 18-24Ne isotopes
Authors: Sarma Chandan , Srivastava Praveen C 
Published: February 2023

Abstract
We report ab initio no-core shell-model (NCSM) study of 18−24Ne isotopes for energy spectra, electromagnetic properties, and point-proton radii using three realistic NN interactions. We have used inside nonlocal outside Yukawa (INOY), charge-dependent Bonn 2000 (CDB2K) and the chiral next-to-next-to-next-to-leading order (N3LO) interactions. We are able to reach basis size up to N
max = 6 for 18Ne and N
max = 4 for the 19−24Ne isotopes with m-scheme dimensions up to 1.0 × 109 in case of 24Ne. We observed better results for INOY interaction in terms of the binding energies of the ground state, and overall all three interactions provide good agreement with the experimental low-energy spectra. Our results for reduced M1 transition strengths and magnetic moments are close to the experimental values. We found that for long-range observables such as the E2 transition strengths, the electric quadrupole moments, and the point-proton radii (r

p
), we need higher N
max calculations to obtain results comparable to the experimental data. We have observed almost 6% increment in the converged r

p
as we increase the model space from N
max = 4 to N
max = 6.
A primer on twistronics: a massless Dirac fermion’s journey to moiré patterns and flat bands in twisted bilayer graphene
Authors: Aggarwal Deepanshu , Narula Rohit , Ghosh Sankalpa 
Published: February 2023

Abstract
The recent discovery of superconductivity in magic-angle twisted bilayer graphene (TBLG) has sparked a renewed interest in the strongly-correlated physics of sp
2 carbons, in stark contrast to preliminary investigations which were dominated by the one-body physics of the massless Dirac fermions. We thus provide a self-contained, theoretical perspective of the journey of graphene from its single-particle physics-dominated regime to the strongly-correlated physics of the flat bands. Beginning from the origin of the Dirac points in condensed matter systems, we discuss the effect of the superlattice on the Fermi velocity and Van Hove singularities in graphene and how it leads naturally to investigations of the moiré pattern in van der Waals heterostructures exemplified by graphene-hexagonal boron-nitride and TBLG. Subsequently, we illuminate the origin of flat bands in TBLG at the magic angles by elaborating on a broad range of prominent theoretical works in a pedagogical way while linking them to available experimental support, where appropriate. We conclude by providing a list of topics in the study of the electronic properties of TBLG not covered by this review but may readily be approached with the help of this primer.